bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 1 | /* |
| 2 | * QEMU System Emulator block driver |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 3 | * |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 4 | * Copyright (c) 2003 Fabrice Bellard |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 5 | * |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 7 | * of this software and associated documentation files (the "Software"), to deal |
| 8 | * in the Software without restriction, including without limitation the rights |
| 9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 10 | * copies of the Software, and to permit persons to whom the Software is |
| 11 | * furnished to do so, subject to the following conditions: |
| 12 | * |
| 13 | * The above copyright notice and this permission notice shall be included in |
| 14 | * all copies or substantial portions of the Software. |
| 15 | * |
| 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| 22 | * THE SOFTWARE. |
| 23 | */ |
blueswir1 | 3990d09 | 2008-12-05 17:53:21 +0000 | [diff] [blame] | 24 | #include "config-host.h" |
pbrook | faf0796 | 2007-11-11 02:51:17 +0000 | [diff] [blame] | 25 | #include "qemu-common.h" |
Stefan Hajnoczi | 6d519a5 | 2010-05-22 18:15:08 +0100 | [diff] [blame] | 26 | #include "trace.h" |
Paolo Bonzini | 737e150 | 2012-12-17 18:19:44 +0100 | [diff] [blame] | 27 | #include "block/block_int.h" |
| 28 | #include "block/blockjob.h" |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 29 | #include "qemu/module.h" |
Paolo Bonzini | 7b1b5d1 | 2012-12-17 18:19:43 +0100 | [diff] [blame] | 30 | #include "qapi/qmp/qjson.h" |
Paolo Bonzini | 9c17d61 | 2012-12-17 18:20:04 +0100 | [diff] [blame] | 31 | #include "sysemu/sysemu.h" |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 32 | #include "qemu/notify.h" |
Paolo Bonzini | 737e150 | 2012-12-17 18:19:44 +0100 | [diff] [blame] | 33 | #include "block/coroutine.h" |
Benoît Canet | c13163f | 2014-01-23 21:31:34 +0100 | [diff] [blame] | 34 | #include "block/qapi.h" |
Luiz Capitulino | b202381 | 2011-09-21 17:16:47 -0300 | [diff] [blame] | 35 | #include "qmp-commands.h" |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 36 | #include "qemu/timer.h" |
Wenchao Xia | a5ee7bd | 2014-06-18 08:43:44 +0200 | [diff] [blame] | 37 | #include "qapi-event.h" |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 38 | |
Juan Quintela | 71e72a1 | 2009-07-27 16:12:56 +0200 | [diff] [blame] | 39 | #ifdef CONFIG_BSD |
bellard | 7674e7b | 2005-04-26 21:59:26 +0000 | [diff] [blame] | 40 | #include <sys/types.h> |
| 41 | #include <sys/stat.h> |
| 42 | #include <sys/ioctl.h> |
Blue Swirl | 72cf2d4 | 2009-09-12 07:36:22 +0000 | [diff] [blame] | 43 | #include <sys/queue.h> |
blueswir1 | c5e9723 | 2009-03-07 20:06:23 +0000 | [diff] [blame] | 44 | #ifndef __DragonFly__ |
bellard | 7674e7b | 2005-04-26 21:59:26 +0000 | [diff] [blame] | 45 | #include <sys/disk.h> |
| 46 | #endif |
blueswir1 | c5e9723 | 2009-03-07 20:06:23 +0000 | [diff] [blame] | 47 | #endif |
bellard | 7674e7b | 2005-04-26 21:59:26 +0000 | [diff] [blame] | 48 | |
aliguori | 49dc768 | 2009-03-08 16:26:59 +0000 | [diff] [blame] | 49 | #ifdef _WIN32 |
| 50 | #include <windows.h> |
| 51 | #endif |
| 52 | |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 53 | struct BdrvDirtyBitmap { |
| 54 | HBitmap *bitmap; |
| 55 | QLIST_ENTRY(BdrvDirtyBitmap) list; |
| 56 | }; |
| 57 | |
Stefan Hajnoczi | 1c9805a | 2011-10-13 13:08:22 +0100 | [diff] [blame] | 58 | #define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */ |
| 59 | |
Markus Armbruster | 7d4b4ba | 2011-09-06 18:58:59 +0200 | [diff] [blame] | 60 | static void bdrv_dev_change_media_cb(BlockDriverState *bs, bool load); |
aliguori | f141eaf | 2009-04-07 18:43:24 +0000 | [diff] [blame] | 61 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
| 62 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, |
aliguori | c87c067 | 2009-04-07 18:43:20 +0000 | [diff] [blame] | 63 | BlockDriverCompletionFunc *cb, void *opaque); |
aliguori | f141eaf | 2009-04-07 18:43:24 +0000 | [diff] [blame] | 64 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
| 65 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, |
pbrook | ce1a14d | 2006-08-07 02:38:06 +0000 | [diff] [blame] | 66 | BlockDriverCompletionFunc *cb, void *opaque); |
Kevin Wolf | f9f05dc | 2011-07-15 13:50:26 +0200 | [diff] [blame] | 67 | static int coroutine_fn bdrv_co_readv_em(BlockDriverState *bs, |
| 68 | int64_t sector_num, int nb_sectors, |
| 69 | QEMUIOVector *iov); |
| 70 | static int coroutine_fn bdrv_co_writev_em(BlockDriverState *bs, |
| 71 | int64_t sector_num, int nb_sectors, |
| 72 | QEMUIOVector *iov); |
Kevin Wolf | 775aa8b | 2013-12-05 12:09:38 +0100 | [diff] [blame] | 73 | static int coroutine_fn bdrv_co_do_preadv(BlockDriverState *bs, |
| 74 | int64_t offset, unsigned int bytes, QEMUIOVector *qiov, |
Stefan Hajnoczi | 470c050 | 2012-01-18 14:40:42 +0000 | [diff] [blame] | 75 | BdrvRequestFlags flags); |
Kevin Wolf | 775aa8b | 2013-12-05 12:09:38 +0100 | [diff] [blame] | 76 | static int coroutine_fn bdrv_co_do_pwritev(BlockDriverState *bs, |
| 77 | int64_t offset, unsigned int bytes, QEMUIOVector *qiov, |
Stefan Hajnoczi | f08f2dd | 2012-02-07 13:27:25 +0000 | [diff] [blame] | 78 | BdrvRequestFlags flags); |
Stefan Hajnoczi | b2a6137 | 2011-10-13 13:08:23 +0100 | [diff] [blame] | 79 | static BlockDriverAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs, |
| 80 | int64_t sector_num, |
| 81 | QEMUIOVector *qiov, |
| 82 | int nb_sectors, |
Paolo Bonzini | d20d9b7 | 2013-11-22 13:39:44 +0100 | [diff] [blame] | 83 | BdrvRequestFlags flags, |
Stefan Hajnoczi | b2a6137 | 2011-10-13 13:08:23 +0100 | [diff] [blame] | 84 | BlockDriverCompletionFunc *cb, |
| 85 | void *opaque, |
Stefan Hajnoczi | 8c5873d | 2011-10-13 21:09:28 +0100 | [diff] [blame] | 86 | bool is_write); |
Stefan Hajnoczi | b2a6137 | 2011-10-13 13:08:23 +0100 | [diff] [blame] | 87 | static void coroutine_fn bdrv_co_do_rw(void *opaque); |
Kevin Wolf | 621f058 | 2012-03-20 15:12:58 +0100 | [diff] [blame] | 88 | static int coroutine_fn bdrv_co_do_write_zeroes(BlockDriverState *bs, |
Peter Lieven | aa7bfbf | 2013-10-24 12:06:51 +0200 | [diff] [blame] | 89 | int64_t sector_num, int nb_sectors, BdrvRequestFlags flags); |
bellard | ec530c8 | 2006-04-25 22:36:06 +0000 | [diff] [blame] | 90 | |
Stefan Hajnoczi | 1b7bdbc | 2010-04-10 07:02:42 +0100 | [diff] [blame] | 91 | static QTAILQ_HEAD(, BlockDriverState) bdrv_states = |
| 92 | QTAILQ_HEAD_INITIALIZER(bdrv_states); |
blueswir1 | 7ee930d | 2008-09-17 19:04:14 +0000 | [diff] [blame] | 93 | |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 94 | static QTAILQ_HEAD(, BlockDriverState) graph_bdrv_states = |
| 95 | QTAILQ_HEAD_INITIALIZER(graph_bdrv_states); |
| 96 | |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 97 | static QLIST_HEAD(, BlockDriver) bdrv_drivers = |
| 98 | QLIST_HEAD_INITIALIZER(bdrv_drivers); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 99 | |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 100 | /* If non-zero, use only whitelisted block drivers */ |
| 101 | static int use_bdrv_whitelist; |
| 102 | |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 103 | #ifdef _WIN32 |
| 104 | static int is_windows_drive_prefix(const char *filename) |
| 105 | { |
| 106 | return (((filename[0] >= 'a' && filename[0] <= 'z') || |
| 107 | (filename[0] >= 'A' && filename[0] <= 'Z')) && |
| 108 | filename[1] == ':'); |
| 109 | } |
| 110 | |
| 111 | int is_windows_drive(const char *filename) |
| 112 | { |
| 113 | if (is_windows_drive_prefix(filename) && |
| 114 | filename[2] == '\0') |
| 115 | return 1; |
| 116 | if (strstart(filename, "\\\\.\\", NULL) || |
| 117 | strstart(filename, "//./", NULL)) |
| 118 | return 1; |
| 119 | return 0; |
| 120 | } |
| 121 | #endif |
| 122 | |
Zhi Yong Wu | 0563e19 | 2011-11-03 16:57:25 +0800 | [diff] [blame] | 123 | /* throttling disk I/O limits */ |
Benoît Canet | cc0681c | 2013-09-02 14:14:39 +0200 | [diff] [blame] | 124 | void bdrv_set_io_limits(BlockDriverState *bs, |
| 125 | ThrottleConfig *cfg) |
| 126 | { |
| 127 | int i; |
| 128 | |
| 129 | throttle_config(&bs->throttle_state, cfg); |
| 130 | |
| 131 | for (i = 0; i < 2; i++) { |
| 132 | qemu_co_enter_next(&bs->throttled_reqs[i]); |
| 133 | } |
| 134 | } |
| 135 | |
| 136 | /* this function drain all the throttled IOs */ |
| 137 | static bool bdrv_start_throttled_reqs(BlockDriverState *bs) |
| 138 | { |
| 139 | bool drained = false; |
| 140 | bool enabled = bs->io_limits_enabled; |
| 141 | int i; |
| 142 | |
| 143 | bs->io_limits_enabled = false; |
| 144 | |
| 145 | for (i = 0; i < 2; i++) { |
| 146 | while (qemu_co_enter_next(&bs->throttled_reqs[i])) { |
| 147 | drained = true; |
| 148 | } |
| 149 | } |
| 150 | |
| 151 | bs->io_limits_enabled = enabled; |
| 152 | |
| 153 | return drained; |
| 154 | } |
| 155 | |
Zhi Yong Wu | 98f90db | 2011-11-08 13:00:14 +0800 | [diff] [blame] | 156 | void bdrv_io_limits_disable(BlockDriverState *bs) |
| 157 | { |
| 158 | bs->io_limits_enabled = false; |
| 159 | |
Benoît Canet | cc0681c | 2013-09-02 14:14:39 +0200 | [diff] [blame] | 160 | bdrv_start_throttled_reqs(bs); |
Zhi Yong Wu | 98f90db | 2011-11-08 13:00:14 +0800 | [diff] [blame] | 161 | |
Benoît Canet | cc0681c | 2013-09-02 14:14:39 +0200 | [diff] [blame] | 162 | throttle_destroy(&bs->throttle_state); |
Zhi Yong Wu | 98f90db | 2011-11-08 13:00:14 +0800 | [diff] [blame] | 163 | } |
| 164 | |
Benoît Canet | cc0681c | 2013-09-02 14:14:39 +0200 | [diff] [blame] | 165 | static void bdrv_throttle_read_timer_cb(void *opaque) |
Zhi Yong Wu | 0563e19 | 2011-11-03 16:57:25 +0800 | [diff] [blame] | 166 | { |
| 167 | BlockDriverState *bs = opaque; |
Benoît Canet | cc0681c | 2013-09-02 14:14:39 +0200 | [diff] [blame] | 168 | qemu_co_enter_next(&bs->throttled_reqs[0]); |
Zhi Yong Wu | 0563e19 | 2011-11-03 16:57:25 +0800 | [diff] [blame] | 169 | } |
| 170 | |
Benoît Canet | cc0681c | 2013-09-02 14:14:39 +0200 | [diff] [blame] | 171 | static void bdrv_throttle_write_timer_cb(void *opaque) |
| 172 | { |
| 173 | BlockDriverState *bs = opaque; |
| 174 | qemu_co_enter_next(&bs->throttled_reqs[1]); |
| 175 | } |
| 176 | |
| 177 | /* should be called before bdrv_set_io_limits if a limit is set */ |
Zhi Yong Wu | 0563e19 | 2011-11-03 16:57:25 +0800 | [diff] [blame] | 178 | void bdrv_io_limits_enable(BlockDriverState *bs) |
| 179 | { |
Benoît Canet | cc0681c | 2013-09-02 14:14:39 +0200 | [diff] [blame] | 180 | assert(!bs->io_limits_enabled); |
| 181 | throttle_init(&bs->throttle_state, |
Stefan Hajnoczi | 13af91e | 2014-05-14 16:22:45 +0200 | [diff] [blame] | 182 | bdrv_get_aio_context(bs), |
Benoît Canet | cc0681c | 2013-09-02 14:14:39 +0200 | [diff] [blame] | 183 | QEMU_CLOCK_VIRTUAL, |
| 184 | bdrv_throttle_read_timer_cb, |
| 185 | bdrv_throttle_write_timer_cb, |
| 186 | bs); |
Zhi Yong Wu | 0563e19 | 2011-11-03 16:57:25 +0800 | [diff] [blame] | 187 | bs->io_limits_enabled = true; |
| 188 | } |
| 189 | |
Benoît Canet | cc0681c | 2013-09-02 14:14:39 +0200 | [diff] [blame] | 190 | /* This function makes an IO wait if needed |
| 191 | * |
| 192 | * @nb_sectors: the number of sectors of the IO |
| 193 | * @is_write: is the IO a write |
| 194 | */ |
Zhi Yong Wu | 98f90db | 2011-11-08 13:00:14 +0800 | [diff] [blame] | 195 | static void bdrv_io_limits_intercept(BlockDriverState *bs, |
Kevin Wolf | d510358 | 2014-01-16 13:29:10 +0100 | [diff] [blame] | 196 | unsigned int bytes, |
Benoît Canet | cc0681c | 2013-09-02 14:14:39 +0200 | [diff] [blame] | 197 | bool is_write) |
Zhi Yong Wu | 98f90db | 2011-11-08 13:00:14 +0800 | [diff] [blame] | 198 | { |
Benoît Canet | cc0681c | 2013-09-02 14:14:39 +0200 | [diff] [blame] | 199 | /* does this io must wait */ |
| 200 | bool must_wait = throttle_schedule_timer(&bs->throttle_state, is_write); |
Zhi Yong Wu | 98f90db | 2011-11-08 13:00:14 +0800 | [diff] [blame] | 201 | |
Benoît Canet | cc0681c | 2013-09-02 14:14:39 +0200 | [diff] [blame] | 202 | /* if must wait or any request of this type throttled queue the IO */ |
| 203 | if (must_wait || |
| 204 | !qemu_co_queue_empty(&bs->throttled_reqs[is_write])) { |
| 205 | qemu_co_queue_wait(&bs->throttled_reqs[is_write]); |
Zhi Yong Wu | 98f90db | 2011-11-08 13:00:14 +0800 | [diff] [blame] | 206 | } |
| 207 | |
Benoît Canet | cc0681c | 2013-09-02 14:14:39 +0200 | [diff] [blame] | 208 | /* the IO will be executed, do the accounting */ |
Kevin Wolf | d510358 | 2014-01-16 13:29:10 +0100 | [diff] [blame] | 209 | throttle_account(&bs->throttle_state, is_write, bytes); |
| 210 | |
Zhi Yong Wu | 98f90db | 2011-11-08 13:00:14 +0800 | [diff] [blame] | 211 | |
Benoît Canet | cc0681c | 2013-09-02 14:14:39 +0200 | [diff] [blame] | 212 | /* if the next request must wait -> do nothing */ |
| 213 | if (throttle_schedule_timer(&bs->throttle_state, is_write)) { |
| 214 | return; |
Zhi Yong Wu | 98f90db | 2011-11-08 13:00:14 +0800 | [diff] [blame] | 215 | } |
| 216 | |
Benoît Canet | cc0681c | 2013-09-02 14:14:39 +0200 | [diff] [blame] | 217 | /* else queue next request for execution */ |
| 218 | qemu_co_queue_next(&bs->throttled_reqs[is_write]); |
Zhi Yong Wu | 98f90db | 2011-11-08 13:00:14 +0800 | [diff] [blame] | 219 | } |
| 220 | |
Kevin Wolf | 339064d | 2013-11-28 10:23:32 +0100 | [diff] [blame] | 221 | size_t bdrv_opt_mem_align(BlockDriverState *bs) |
| 222 | { |
| 223 | if (!bs || !bs->drv) { |
| 224 | /* 4k should be on the safe side */ |
| 225 | return 4096; |
| 226 | } |
| 227 | |
| 228 | return bs->bl.opt_mem_alignment; |
| 229 | } |
| 230 | |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 231 | /* check if the path starts with "<protocol>:" */ |
| 232 | static int path_has_protocol(const char *path) |
| 233 | { |
Paolo Bonzini | 947995c | 2012-05-08 16:51:48 +0200 | [diff] [blame] | 234 | const char *p; |
| 235 | |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 236 | #ifdef _WIN32 |
| 237 | if (is_windows_drive(path) || |
| 238 | is_windows_drive_prefix(path)) { |
| 239 | return 0; |
| 240 | } |
Paolo Bonzini | 947995c | 2012-05-08 16:51:48 +0200 | [diff] [blame] | 241 | p = path + strcspn(path, ":/\\"); |
| 242 | #else |
| 243 | p = path + strcspn(path, ":/"); |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 244 | #endif |
| 245 | |
Paolo Bonzini | 947995c | 2012-05-08 16:51:48 +0200 | [diff] [blame] | 246 | return *p == ':'; |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 247 | } |
| 248 | |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 249 | int path_is_absolute(const char *path) |
| 250 | { |
bellard | 2166442 | 2007-01-07 18:22:37 +0000 | [diff] [blame] | 251 | #ifdef _WIN32 |
| 252 | /* specific case for names like: "\\.\d:" */ |
Paolo Bonzini | f53f4da | 2012-05-08 16:51:47 +0200 | [diff] [blame] | 253 | if (is_windows_drive(path) || is_windows_drive_prefix(path)) { |
bellard | 2166442 | 2007-01-07 18:22:37 +0000 | [diff] [blame] | 254 | return 1; |
Paolo Bonzini | f53f4da | 2012-05-08 16:51:47 +0200 | [diff] [blame] | 255 | } |
| 256 | return (*path == '/' || *path == '\\'); |
bellard | 3b9f94e | 2007-01-07 17:27:07 +0000 | [diff] [blame] | 257 | #else |
Paolo Bonzini | f53f4da | 2012-05-08 16:51:47 +0200 | [diff] [blame] | 258 | return (*path == '/'); |
bellard | 3b9f94e | 2007-01-07 17:27:07 +0000 | [diff] [blame] | 259 | #endif |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 260 | } |
| 261 | |
| 262 | /* if filename is absolute, just copy it to dest. Otherwise, build a |
| 263 | path to it by considering it is relative to base_path. URL are |
| 264 | supported. */ |
| 265 | void path_combine(char *dest, int dest_size, |
| 266 | const char *base_path, |
| 267 | const char *filename) |
| 268 | { |
| 269 | const char *p, *p1; |
| 270 | int len; |
| 271 | |
| 272 | if (dest_size <= 0) |
| 273 | return; |
| 274 | if (path_is_absolute(filename)) { |
| 275 | pstrcpy(dest, dest_size, filename); |
| 276 | } else { |
| 277 | p = strchr(base_path, ':'); |
| 278 | if (p) |
| 279 | p++; |
| 280 | else |
| 281 | p = base_path; |
bellard | 3b9f94e | 2007-01-07 17:27:07 +0000 | [diff] [blame] | 282 | p1 = strrchr(base_path, '/'); |
| 283 | #ifdef _WIN32 |
| 284 | { |
| 285 | const char *p2; |
| 286 | p2 = strrchr(base_path, '\\'); |
| 287 | if (!p1 || p2 > p1) |
| 288 | p1 = p2; |
| 289 | } |
| 290 | #endif |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 291 | if (p1) |
| 292 | p1++; |
| 293 | else |
| 294 | p1 = base_path; |
| 295 | if (p1 > p) |
| 296 | p = p1; |
| 297 | len = p - base_path; |
| 298 | if (len > dest_size - 1) |
| 299 | len = dest_size - 1; |
| 300 | memcpy(dest, base_path, len); |
| 301 | dest[len] = '\0'; |
| 302 | pstrcat(dest, dest_size, filename); |
| 303 | } |
| 304 | } |
| 305 | |
Paolo Bonzini | dc5a137 | 2012-05-08 16:51:50 +0200 | [diff] [blame] | 306 | void bdrv_get_full_backing_filename(BlockDriverState *bs, char *dest, size_t sz) |
| 307 | { |
| 308 | if (bs->backing_file[0] == '\0' || path_has_protocol(bs->backing_file)) { |
| 309 | pstrcpy(dest, sz, bs->backing_file); |
| 310 | } else { |
| 311 | path_combine(dest, sz, bs->filename, bs->backing_file); |
| 312 | } |
| 313 | } |
| 314 | |
Anthony Liguori | 5efa9d5 | 2009-05-09 17:03:42 -0500 | [diff] [blame] | 315 | void bdrv_register(BlockDriver *bdrv) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 316 | { |
Stefan Hajnoczi | 8c5873d | 2011-10-13 21:09:28 +0100 | [diff] [blame] | 317 | /* Block drivers without coroutine functions need emulation */ |
| 318 | if (!bdrv->bdrv_co_readv) { |
Kevin Wolf | f9f05dc | 2011-07-15 13:50:26 +0200 | [diff] [blame] | 319 | bdrv->bdrv_co_readv = bdrv_co_readv_em; |
| 320 | bdrv->bdrv_co_writev = bdrv_co_writev_em; |
| 321 | |
Stefan Hajnoczi | f8c35c1 | 2011-10-13 21:09:31 +0100 | [diff] [blame] | 322 | /* bdrv_co_readv_em()/brdv_co_writev_em() work in terms of aio, so if |
| 323 | * the block driver lacks aio we need to emulate that too. |
| 324 | */ |
Kevin Wolf | f9f05dc | 2011-07-15 13:50:26 +0200 | [diff] [blame] | 325 | if (!bdrv->bdrv_aio_readv) { |
| 326 | /* add AIO emulation layer */ |
| 327 | bdrv->bdrv_aio_readv = bdrv_aio_readv_em; |
| 328 | bdrv->bdrv_aio_writev = bdrv_aio_writev_em; |
Kevin Wolf | f9f05dc | 2011-07-15 13:50:26 +0200 | [diff] [blame] | 329 | } |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 330 | } |
Christoph Hellwig | b2e12bc | 2009-09-04 19:01:49 +0200 | [diff] [blame] | 331 | |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 332 | QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 333 | } |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 334 | |
| 335 | /* create a new block device (by default it is empty) */ |
Kevin Wolf | 98522f6 | 2014-04-17 13:16:01 +0200 | [diff] [blame] | 336 | BlockDriverState *bdrv_new(const char *device_name, Error **errp) |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 337 | { |
Stefan Hajnoczi | 1b7bdbc | 2010-04-10 07:02:42 +0100 | [diff] [blame] | 338 | BlockDriverState *bs; |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 339 | int i; |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 340 | |
Kevin Wolf | f2d953e | 2014-04-17 13:27:05 +0200 | [diff] [blame] | 341 | if (bdrv_find(device_name)) { |
| 342 | error_setg(errp, "Device with id '%s' already exists", |
| 343 | device_name); |
| 344 | return NULL; |
| 345 | } |
| 346 | if (bdrv_find_node(device_name)) { |
| 347 | error_setg(errp, "Device with node-name '%s' already exists", |
| 348 | device_name); |
| 349 | return NULL; |
| 350 | } |
| 351 | |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 352 | bs = g_malloc0(sizeof(BlockDriverState)); |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 353 | QLIST_INIT(&bs->dirty_bitmaps); |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 354 | pstrcpy(bs->device_name, sizeof(bs->device_name), device_name); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 355 | if (device_name[0] != '\0') { |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 356 | QTAILQ_INSERT_TAIL(&bdrv_states, bs, device_list); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 357 | } |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 358 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { |
| 359 | QLIST_INIT(&bs->op_blockers[i]); |
| 360 | } |
Luiz Capitulino | 28a7282 | 2011-09-26 17:43:50 -0300 | [diff] [blame] | 361 | bdrv_iostatus_disable(bs); |
Paolo Bonzini | d7d512f | 2012-08-23 11:20:36 +0200 | [diff] [blame] | 362 | notifier_list_init(&bs->close_notifiers); |
Stefan Hajnoczi | d616b22 | 2013-06-24 17:13:10 +0200 | [diff] [blame] | 363 | notifier_with_return_list_init(&bs->before_write_notifiers); |
Benoît Canet | cc0681c | 2013-09-02 14:14:39 +0200 | [diff] [blame] | 364 | qemu_co_queue_init(&bs->throttled_reqs[0]); |
| 365 | qemu_co_queue_init(&bs->throttled_reqs[1]); |
Fam Zheng | 9fcb025 | 2013-08-23 09:14:46 +0800 | [diff] [blame] | 366 | bs->refcnt = 1; |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 367 | bs->aio_context = qemu_get_aio_context(); |
Paolo Bonzini | d7d512f | 2012-08-23 11:20:36 +0200 | [diff] [blame] | 368 | |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 369 | return bs; |
| 370 | } |
| 371 | |
Paolo Bonzini | d7d512f | 2012-08-23 11:20:36 +0200 | [diff] [blame] | 372 | void bdrv_add_close_notifier(BlockDriverState *bs, Notifier *notify) |
| 373 | { |
| 374 | notifier_list_add(&bs->close_notifiers, notify); |
| 375 | } |
| 376 | |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 377 | BlockDriver *bdrv_find_format(const char *format_name) |
| 378 | { |
| 379 | BlockDriver *drv1; |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 380 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
| 381 | if (!strcmp(drv1->format_name, format_name)) { |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 382 | return drv1; |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 383 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 384 | } |
| 385 | return NULL; |
| 386 | } |
| 387 | |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 388 | static int bdrv_is_whitelisted(BlockDriver *drv, bool read_only) |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 389 | { |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 390 | static const char *whitelist_rw[] = { |
| 391 | CONFIG_BDRV_RW_WHITELIST |
| 392 | }; |
| 393 | static const char *whitelist_ro[] = { |
| 394 | CONFIG_BDRV_RO_WHITELIST |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 395 | }; |
| 396 | const char **p; |
| 397 | |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 398 | if (!whitelist_rw[0] && !whitelist_ro[0]) { |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 399 | return 1; /* no whitelist, anything goes */ |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 400 | } |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 401 | |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 402 | for (p = whitelist_rw; *p; p++) { |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 403 | if (!strcmp(drv->format_name, *p)) { |
| 404 | return 1; |
| 405 | } |
| 406 | } |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 407 | if (read_only) { |
| 408 | for (p = whitelist_ro; *p; p++) { |
| 409 | if (!strcmp(drv->format_name, *p)) { |
| 410 | return 1; |
| 411 | } |
| 412 | } |
| 413 | } |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 414 | return 0; |
| 415 | } |
| 416 | |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 417 | BlockDriver *bdrv_find_whitelisted_format(const char *format_name, |
| 418 | bool read_only) |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 419 | { |
| 420 | BlockDriver *drv = bdrv_find_format(format_name); |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 421 | return drv && bdrv_is_whitelisted(drv, read_only) ? drv : NULL; |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 422 | } |
| 423 | |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 424 | typedef struct CreateCo { |
| 425 | BlockDriver *drv; |
| 426 | char *filename; |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 427 | QemuOpts *opts; |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 428 | int ret; |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 429 | Error *err; |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 430 | } CreateCo; |
| 431 | |
| 432 | static void coroutine_fn bdrv_create_co_entry(void *opaque) |
| 433 | { |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 434 | Error *local_err = NULL; |
| 435 | int ret; |
| 436 | |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 437 | CreateCo *cco = opaque; |
| 438 | assert(cco->drv); |
| 439 | |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 440 | ret = cco->drv->bdrv_create(cco->filename, cco->opts, &local_err); |
Markus Armbruster | 84d18f0 | 2014-01-30 15:07:28 +0100 | [diff] [blame] | 441 | if (local_err) { |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 442 | error_propagate(&cco->err, local_err); |
| 443 | } |
| 444 | cco->ret = ret; |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 445 | } |
| 446 | |
Kevin Wolf | 0e7e198 | 2009-05-18 16:42:10 +0200 | [diff] [blame] | 447 | int bdrv_create(BlockDriver *drv, const char* filename, |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 448 | QemuOpts *opts, Error **errp) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 449 | { |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 450 | int ret; |
Kevin Wolf | 0e7e198 | 2009-05-18 16:42:10 +0200 | [diff] [blame] | 451 | |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 452 | Coroutine *co; |
| 453 | CreateCo cco = { |
| 454 | .drv = drv, |
| 455 | .filename = g_strdup(filename), |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 456 | .opts = opts, |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 457 | .ret = NOT_DONE, |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 458 | .err = NULL, |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 459 | }; |
| 460 | |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 461 | if (!drv->bdrv_create) { |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 462 | error_setg(errp, "Driver '%s' does not support image creation", drv->format_name); |
Luiz Capitulino | 80168bf | 2012-10-17 16:45:25 -0300 | [diff] [blame] | 463 | ret = -ENOTSUP; |
| 464 | goto out; |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 465 | } |
| 466 | |
| 467 | if (qemu_in_coroutine()) { |
| 468 | /* Fast-path if already in coroutine context */ |
| 469 | bdrv_create_co_entry(&cco); |
| 470 | } else { |
| 471 | co = qemu_coroutine_create(bdrv_create_co_entry); |
| 472 | qemu_coroutine_enter(co, &cco); |
| 473 | while (cco.ret == NOT_DONE) { |
| 474 | qemu_aio_wait(); |
| 475 | } |
| 476 | } |
| 477 | |
| 478 | ret = cco.ret; |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 479 | if (ret < 0) { |
Markus Armbruster | 84d18f0 | 2014-01-30 15:07:28 +0100 | [diff] [blame] | 480 | if (cco.err) { |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 481 | error_propagate(errp, cco.err); |
| 482 | } else { |
| 483 | error_setg_errno(errp, -ret, "Could not create image"); |
| 484 | } |
| 485 | } |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 486 | |
Luiz Capitulino | 80168bf | 2012-10-17 16:45:25 -0300 | [diff] [blame] | 487 | out: |
| 488 | g_free(cco.filename); |
Zhi Yong Wu | 5b7e154 | 2012-05-07 16:50:42 +0800 | [diff] [blame] | 489 | return ret; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 490 | } |
| 491 | |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 492 | int bdrv_create_file(const char *filename, QemuOpts *opts, Error **errp) |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 493 | { |
| 494 | BlockDriver *drv; |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 495 | Error *local_err = NULL; |
| 496 | int ret; |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 497 | |
Kevin Wolf | 9828962 | 2013-07-10 15:47:39 +0200 | [diff] [blame] | 498 | drv = bdrv_find_protocol(filename, true); |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 499 | if (drv == NULL) { |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 500 | error_setg(errp, "Could not find protocol for file '%s'", filename); |
Stefan Hajnoczi | 16905d7 | 2010-11-30 15:14:14 +0000 | [diff] [blame] | 501 | return -ENOENT; |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 502 | } |
| 503 | |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 504 | ret = bdrv_create(drv, filename, opts, &local_err); |
Markus Armbruster | 84d18f0 | 2014-01-30 15:07:28 +0100 | [diff] [blame] | 505 | if (local_err) { |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 506 | error_propagate(errp, local_err); |
| 507 | } |
| 508 | return ret; |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 509 | } |
| 510 | |
Kevin Wolf | 355ef4a | 2013-12-11 20:14:09 +0100 | [diff] [blame] | 511 | int bdrv_refresh_limits(BlockDriverState *bs) |
Kevin Wolf | d34682c | 2013-12-11 19:26:16 +0100 | [diff] [blame] | 512 | { |
| 513 | BlockDriver *drv = bs->drv; |
| 514 | |
| 515 | memset(&bs->bl, 0, sizeof(bs->bl)); |
| 516 | |
Kevin Wolf | 466ad82 | 2013-12-11 19:50:32 +0100 | [diff] [blame] | 517 | if (!drv) { |
| 518 | return 0; |
| 519 | } |
| 520 | |
| 521 | /* Take some limits from the children as a default */ |
| 522 | if (bs->file) { |
| 523 | bdrv_refresh_limits(bs->file); |
| 524 | bs->bl.opt_transfer_length = bs->file->bl.opt_transfer_length; |
Kevin Wolf | 339064d | 2013-11-28 10:23:32 +0100 | [diff] [blame] | 525 | bs->bl.opt_mem_alignment = bs->file->bl.opt_mem_alignment; |
| 526 | } else { |
| 527 | bs->bl.opt_mem_alignment = 512; |
Kevin Wolf | 466ad82 | 2013-12-11 19:50:32 +0100 | [diff] [blame] | 528 | } |
| 529 | |
| 530 | if (bs->backing_hd) { |
| 531 | bdrv_refresh_limits(bs->backing_hd); |
| 532 | bs->bl.opt_transfer_length = |
| 533 | MAX(bs->bl.opt_transfer_length, |
| 534 | bs->backing_hd->bl.opt_transfer_length); |
Kevin Wolf | 339064d | 2013-11-28 10:23:32 +0100 | [diff] [blame] | 535 | bs->bl.opt_mem_alignment = |
| 536 | MAX(bs->bl.opt_mem_alignment, |
| 537 | bs->backing_hd->bl.opt_mem_alignment); |
Kevin Wolf | 466ad82 | 2013-12-11 19:50:32 +0100 | [diff] [blame] | 538 | } |
| 539 | |
| 540 | /* Then let the driver override it */ |
| 541 | if (drv->bdrv_refresh_limits) { |
Kevin Wolf | d34682c | 2013-12-11 19:26:16 +0100 | [diff] [blame] | 542 | return drv->bdrv_refresh_limits(bs); |
| 543 | } |
| 544 | |
| 545 | return 0; |
| 546 | } |
| 547 | |
Jim Meyering | eba2505 | 2012-05-28 09:27:54 +0200 | [diff] [blame] | 548 | /* |
| 549 | * Create a uniquely-named empty temporary file. |
| 550 | * Return 0 upon success, otherwise a negative errno value. |
| 551 | */ |
| 552 | int get_tmp_filename(char *filename, int size) |
| 553 | { |
bellard | d524939 | 2004-08-03 21:14:23 +0000 | [diff] [blame] | 554 | #ifdef _WIN32 |
bellard | 3b9f94e | 2007-01-07 17:27:07 +0000 | [diff] [blame] | 555 | char temp_dir[MAX_PATH]; |
Jim Meyering | eba2505 | 2012-05-28 09:27:54 +0200 | [diff] [blame] | 556 | /* GetTempFileName requires that its output buffer (4th param) |
| 557 | have length MAX_PATH or greater. */ |
| 558 | assert(size >= MAX_PATH); |
| 559 | return (GetTempPath(MAX_PATH, temp_dir) |
| 560 | && GetTempFileName(temp_dir, "qem", 0, filename) |
| 561 | ? 0 : -GetLastError()); |
bellard | d524939 | 2004-08-03 21:14:23 +0000 | [diff] [blame] | 562 | #else |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 563 | int fd; |
blueswir1 | 7ccfb2e | 2008-09-14 06:45:34 +0000 | [diff] [blame] | 564 | const char *tmpdir; |
aurel32 | 0badc1e | 2008-03-10 00:05:34 +0000 | [diff] [blame] | 565 | tmpdir = getenv("TMPDIR"); |
Amit Shah | 69bef79 | 2014-02-26 15:12:37 +0530 | [diff] [blame] | 566 | if (!tmpdir) { |
| 567 | tmpdir = "/var/tmp"; |
| 568 | } |
Jim Meyering | eba2505 | 2012-05-28 09:27:54 +0200 | [diff] [blame] | 569 | if (snprintf(filename, size, "%s/vl.XXXXXX", tmpdir) >= size) { |
| 570 | return -EOVERFLOW; |
| 571 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 572 | fd = mkstemp(filename); |
Dunrong Huang | fe235a0 | 2012-09-05 21:26:22 +0800 | [diff] [blame] | 573 | if (fd < 0) { |
| 574 | return -errno; |
| 575 | } |
| 576 | if (close(fd) != 0) { |
| 577 | unlink(filename); |
Jim Meyering | eba2505 | 2012-05-28 09:27:54 +0200 | [diff] [blame] | 578 | return -errno; |
| 579 | } |
| 580 | return 0; |
bellard | d524939 | 2004-08-03 21:14:23 +0000 | [diff] [blame] | 581 | #endif |
Jim Meyering | eba2505 | 2012-05-28 09:27:54 +0200 | [diff] [blame] | 582 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 583 | |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 584 | /* |
| 585 | * Detect host devices. By convention, /dev/cdrom[N] is always |
| 586 | * recognized as a host CDROM. |
| 587 | */ |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 588 | static BlockDriver *find_hdev_driver(const char *filename) |
| 589 | { |
Christoph Hellwig | 508c7cb | 2009-06-15 14:04:22 +0200 | [diff] [blame] | 590 | int score_max = 0, score; |
| 591 | BlockDriver *drv = NULL, *d; |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 592 | |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 593 | QLIST_FOREACH(d, &bdrv_drivers, list) { |
Christoph Hellwig | 508c7cb | 2009-06-15 14:04:22 +0200 | [diff] [blame] | 594 | if (d->bdrv_probe_device) { |
| 595 | score = d->bdrv_probe_device(filename); |
| 596 | if (score > score_max) { |
| 597 | score_max = score; |
| 598 | drv = d; |
| 599 | } |
| 600 | } |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 601 | } |
| 602 | |
Christoph Hellwig | 508c7cb | 2009-06-15 14:04:22 +0200 | [diff] [blame] | 603 | return drv; |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 604 | } |
Christoph Hellwig | f3a5d3f | 2009-06-15 13:55:19 +0200 | [diff] [blame] | 605 | |
Kevin Wolf | 9828962 | 2013-07-10 15:47:39 +0200 | [diff] [blame] | 606 | BlockDriver *bdrv_find_protocol(const char *filename, |
| 607 | bool allow_protocol_prefix) |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 608 | { |
| 609 | BlockDriver *drv1; |
| 610 | char protocol[128]; |
| 611 | int len; |
| 612 | const char *p; |
| 613 | |
Kevin Wolf | 66f82ce | 2010-04-14 14:17:38 +0200 | [diff] [blame] | 614 | /* TODO Drivers without bdrv_file_open must be specified explicitly */ |
| 615 | |
Christoph Hellwig | 39508e7 | 2010-06-23 12:25:17 +0200 | [diff] [blame] | 616 | /* |
| 617 | * XXX(hch): we really should not let host device detection |
| 618 | * override an explicit protocol specification, but moving this |
| 619 | * later breaks access to device names with colons in them. |
| 620 | * Thanks to the brain-dead persistent naming schemes on udev- |
| 621 | * based Linux systems those actually are quite common. |
| 622 | */ |
| 623 | drv1 = find_hdev_driver(filename); |
| 624 | if (drv1) { |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 625 | return drv1; |
| 626 | } |
Christoph Hellwig | 39508e7 | 2010-06-23 12:25:17 +0200 | [diff] [blame] | 627 | |
Kevin Wolf | 9828962 | 2013-07-10 15:47:39 +0200 | [diff] [blame] | 628 | if (!path_has_protocol(filename) || !allow_protocol_prefix) { |
Christoph Hellwig | 39508e7 | 2010-06-23 12:25:17 +0200 | [diff] [blame] | 629 | return bdrv_find_format("file"); |
| 630 | } |
Kevin Wolf | 9828962 | 2013-07-10 15:47:39 +0200 | [diff] [blame] | 631 | |
Stefan Hajnoczi | 9e0b22f | 2010-12-09 11:53:00 +0000 | [diff] [blame] | 632 | p = strchr(filename, ':'); |
| 633 | assert(p != NULL); |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 634 | len = p - filename; |
| 635 | if (len > sizeof(protocol) - 1) |
| 636 | len = sizeof(protocol) - 1; |
| 637 | memcpy(protocol, filename, len); |
| 638 | protocol[len] = '\0'; |
| 639 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
| 640 | if (drv1->protocol_name && |
| 641 | !strcmp(drv1->protocol_name, protocol)) { |
| 642 | return drv1; |
| 643 | } |
| 644 | } |
| 645 | return NULL; |
| 646 | } |
| 647 | |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 648 | static int find_image_format(BlockDriverState *bs, const char *filename, |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 649 | BlockDriver **pdrv, Error **errp) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 650 | { |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 651 | int score, score_max; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 652 | BlockDriver *drv1, *drv; |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 653 | uint8_t buf[2048]; |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 654 | int ret = 0; |
Nicholas Bellinger | f8ea0b0 | 2010-05-17 09:45:57 -0700 | [diff] [blame] | 655 | |
Kevin Wolf | 08a0055 | 2010-06-01 18:37:31 +0200 | [diff] [blame] | 656 | /* Return the raw BlockDriver * to scsi-generic devices or empty drives */ |
Paolo Bonzini | 8e89559 | 2013-01-10 15:39:27 +0100 | [diff] [blame] | 657 | if (bs->sg || !bdrv_is_inserted(bs) || bdrv_getlength(bs) == 0) { |
Stefan Weil | c98ac35 | 2010-07-21 21:51:51 +0200 | [diff] [blame] | 658 | drv = bdrv_find_format("raw"); |
| 659 | if (!drv) { |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 660 | error_setg(errp, "Could not find raw image format"); |
Stefan Weil | c98ac35 | 2010-07-21 21:51:51 +0200 | [diff] [blame] | 661 | ret = -ENOENT; |
| 662 | } |
| 663 | *pdrv = drv; |
| 664 | return ret; |
Nicholas A. Bellinger | 1a39685 | 2010-05-27 08:56:28 -0700 | [diff] [blame] | 665 | } |
Nicholas Bellinger | f8ea0b0 | 2010-05-17 09:45:57 -0700 | [diff] [blame] | 666 | |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 667 | ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 668 | if (ret < 0) { |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 669 | error_setg_errno(errp, -ret, "Could not read image for determining its " |
| 670 | "format"); |
Stefan Weil | c98ac35 | 2010-07-21 21:51:51 +0200 | [diff] [blame] | 671 | *pdrv = NULL; |
| 672 | return ret; |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 673 | } |
| 674 | |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 675 | score_max = 0; |
Christoph Hellwig | 84a12e6 | 2010-04-07 22:30:24 +0200 | [diff] [blame] | 676 | drv = NULL; |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 677 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 678 | if (drv1->bdrv_probe) { |
| 679 | score = drv1->bdrv_probe(buf, ret, filename); |
| 680 | if (score > score_max) { |
| 681 | score_max = score; |
| 682 | drv = drv1; |
| 683 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 684 | } |
| 685 | } |
Stefan Weil | c98ac35 | 2010-07-21 21:51:51 +0200 | [diff] [blame] | 686 | if (!drv) { |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 687 | error_setg(errp, "Could not determine image format: No compatible " |
| 688 | "driver found"); |
Stefan Weil | c98ac35 | 2010-07-21 21:51:51 +0200 | [diff] [blame] | 689 | ret = -ENOENT; |
| 690 | } |
| 691 | *pdrv = drv; |
| 692 | return ret; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 693 | } |
| 694 | |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 695 | /** |
| 696 | * Set the current 'total_sectors' value |
| 697 | */ |
| 698 | static int refresh_total_sectors(BlockDriverState *bs, int64_t hint) |
| 699 | { |
| 700 | BlockDriver *drv = bs->drv; |
| 701 | |
Nicholas Bellinger | 396759a | 2010-05-17 09:46:04 -0700 | [diff] [blame] | 702 | /* Do not attempt drv->bdrv_getlength() on scsi-generic devices */ |
| 703 | if (bs->sg) |
| 704 | return 0; |
| 705 | |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 706 | /* query actual device if possible, otherwise just trust the hint */ |
| 707 | if (drv->bdrv_getlength) { |
| 708 | int64_t length = drv->bdrv_getlength(bs); |
| 709 | if (length < 0) { |
| 710 | return length; |
| 711 | } |
Fam Zheng | 7e38200 | 2013-11-06 19:48:06 +0800 | [diff] [blame] | 712 | hint = DIV_ROUND_UP(length, BDRV_SECTOR_SIZE); |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 713 | } |
| 714 | |
| 715 | bs->total_sectors = hint; |
| 716 | return 0; |
| 717 | } |
| 718 | |
Stefan Hajnoczi | c3993cd | 2011-08-04 12:26:51 +0100 | [diff] [blame] | 719 | /** |
Paolo Bonzini | 9e8f183 | 2013-02-08 14:06:11 +0100 | [diff] [blame] | 720 | * Set open flags for a given discard mode |
| 721 | * |
| 722 | * Return 0 on success, -1 if the discard mode was invalid. |
| 723 | */ |
| 724 | int bdrv_parse_discard_flags(const char *mode, int *flags) |
| 725 | { |
| 726 | *flags &= ~BDRV_O_UNMAP; |
| 727 | |
| 728 | if (!strcmp(mode, "off") || !strcmp(mode, "ignore")) { |
| 729 | /* do nothing */ |
| 730 | } else if (!strcmp(mode, "on") || !strcmp(mode, "unmap")) { |
| 731 | *flags |= BDRV_O_UNMAP; |
| 732 | } else { |
| 733 | return -1; |
| 734 | } |
| 735 | |
| 736 | return 0; |
| 737 | } |
| 738 | |
| 739 | /** |
Stefan Hajnoczi | c3993cd | 2011-08-04 12:26:51 +0100 | [diff] [blame] | 740 | * Set open flags for a given cache mode |
| 741 | * |
| 742 | * Return 0 on success, -1 if the cache mode was invalid. |
| 743 | */ |
| 744 | int bdrv_parse_cache_flags(const char *mode, int *flags) |
| 745 | { |
| 746 | *flags &= ~BDRV_O_CACHE_MASK; |
| 747 | |
| 748 | if (!strcmp(mode, "off") || !strcmp(mode, "none")) { |
| 749 | *flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB; |
Stefan Hajnoczi | 92196b2 | 2011-08-04 12:26:52 +0100 | [diff] [blame] | 750 | } else if (!strcmp(mode, "directsync")) { |
| 751 | *flags |= BDRV_O_NOCACHE; |
Stefan Hajnoczi | c3993cd | 2011-08-04 12:26:51 +0100 | [diff] [blame] | 752 | } else if (!strcmp(mode, "writeback")) { |
| 753 | *flags |= BDRV_O_CACHE_WB; |
| 754 | } else if (!strcmp(mode, "unsafe")) { |
| 755 | *flags |= BDRV_O_CACHE_WB; |
| 756 | *flags |= BDRV_O_NO_FLUSH; |
| 757 | } else if (!strcmp(mode, "writethrough")) { |
| 758 | /* this is the default */ |
| 759 | } else { |
| 760 | return -1; |
| 761 | } |
| 762 | |
| 763 | return 0; |
| 764 | } |
| 765 | |
Stefan Hajnoczi | 53fec9d | 2011-11-28 16:08:47 +0000 | [diff] [blame] | 766 | /** |
| 767 | * The copy-on-read flag is actually a reference count so multiple users may |
| 768 | * use the feature without worrying about clobbering its previous state. |
| 769 | * Copy-on-read stays enabled until all users have called to disable it. |
| 770 | */ |
| 771 | void bdrv_enable_copy_on_read(BlockDriverState *bs) |
| 772 | { |
| 773 | bs->copy_on_read++; |
| 774 | } |
| 775 | |
| 776 | void bdrv_disable_copy_on_read(BlockDriverState *bs) |
| 777 | { |
| 778 | assert(bs->copy_on_read > 0); |
| 779 | bs->copy_on_read--; |
| 780 | } |
| 781 | |
Kevin Wolf | 0b50cc8 | 2014-04-11 21:29:52 +0200 | [diff] [blame] | 782 | /* |
Kevin Wolf | b1e6fc0 | 2014-05-06 12:11:42 +0200 | [diff] [blame] | 783 | * Returns the flags that a temporary snapshot should get, based on the |
| 784 | * originally requested flags (the originally requested image will have flags |
| 785 | * like a backing file) |
| 786 | */ |
| 787 | static int bdrv_temp_snapshot_flags(int flags) |
| 788 | { |
| 789 | return (flags & ~BDRV_O_SNAPSHOT) | BDRV_O_TEMPORARY; |
| 790 | } |
| 791 | |
| 792 | /* |
Kevin Wolf | 0b50cc8 | 2014-04-11 21:29:52 +0200 | [diff] [blame] | 793 | * Returns the flags that bs->file should get, based on the given flags for |
| 794 | * the parent BDS |
| 795 | */ |
| 796 | static int bdrv_inherited_flags(int flags) |
| 797 | { |
| 798 | /* Enable protocol handling, disable format probing for bs->file */ |
| 799 | flags |= BDRV_O_PROTOCOL; |
| 800 | |
| 801 | /* Our block drivers take care to send flushes and respect unmap policy, |
| 802 | * so we can enable both unconditionally on lower layers. */ |
| 803 | flags |= BDRV_O_CACHE_WB | BDRV_O_UNMAP; |
| 804 | |
Kevin Wolf | 0b50cc8 | 2014-04-11 21:29:52 +0200 | [diff] [blame] | 805 | /* Clear flags that only apply to the top layer */ |
Kevin Wolf | 5669b44 | 2014-04-11 21:36:45 +0200 | [diff] [blame] | 806 | flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | BDRV_O_COPY_ON_READ); |
Kevin Wolf | 0b50cc8 | 2014-04-11 21:29:52 +0200 | [diff] [blame] | 807 | |
| 808 | return flags; |
| 809 | } |
| 810 | |
Kevin Wolf | 317fc44 | 2014-04-25 13:27:34 +0200 | [diff] [blame] | 811 | /* |
| 812 | * Returns the flags that bs->backing_hd should get, based on the given flags |
| 813 | * for the parent BDS |
| 814 | */ |
| 815 | static int bdrv_backing_flags(int flags) |
| 816 | { |
| 817 | /* backing files always opened read-only */ |
| 818 | flags &= ~(BDRV_O_RDWR | BDRV_O_COPY_ON_READ); |
| 819 | |
| 820 | /* snapshot=on is handled on the top layer */ |
Kevin Wolf | 8bfea15 | 2014-04-11 19:16:36 +0200 | [diff] [blame] | 821 | flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_TEMPORARY); |
Kevin Wolf | 317fc44 | 2014-04-25 13:27:34 +0200 | [diff] [blame] | 822 | |
| 823 | return flags; |
| 824 | } |
| 825 | |
Kevin Wolf | 7b27245 | 2012-11-12 17:05:39 +0100 | [diff] [blame] | 826 | static int bdrv_open_flags(BlockDriverState *bs, int flags) |
| 827 | { |
| 828 | int open_flags = flags | BDRV_O_CACHE_WB; |
| 829 | |
| 830 | /* |
| 831 | * Clear flags that are internal to the block layer before opening the |
| 832 | * image. |
| 833 | */ |
Kevin Wolf | 20cca27 | 2014-06-04 14:33:27 +0200 | [diff] [blame] | 834 | open_flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | BDRV_O_PROTOCOL); |
Kevin Wolf | 7b27245 | 2012-11-12 17:05:39 +0100 | [diff] [blame] | 835 | |
| 836 | /* |
| 837 | * Snapshots should be writable. |
| 838 | */ |
Kevin Wolf | 8bfea15 | 2014-04-11 19:16:36 +0200 | [diff] [blame] | 839 | if (flags & BDRV_O_TEMPORARY) { |
Kevin Wolf | 7b27245 | 2012-11-12 17:05:39 +0100 | [diff] [blame] | 840 | open_flags |= BDRV_O_RDWR; |
| 841 | } |
| 842 | |
| 843 | return open_flags; |
| 844 | } |
| 845 | |
Kevin Wolf | 636ea37 | 2014-01-24 14:11:52 +0100 | [diff] [blame] | 846 | static void bdrv_assign_node_name(BlockDriverState *bs, |
| 847 | const char *node_name, |
| 848 | Error **errp) |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 849 | { |
| 850 | if (!node_name) { |
Kevin Wolf | 636ea37 | 2014-01-24 14:11:52 +0100 | [diff] [blame] | 851 | return; |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 852 | } |
| 853 | |
| 854 | /* empty string node name is invalid */ |
| 855 | if (node_name[0] == '\0') { |
| 856 | error_setg(errp, "Empty node name"); |
Kevin Wolf | 636ea37 | 2014-01-24 14:11:52 +0100 | [diff] [blame] | 857 | return; |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 858 | } |
| 859 | |
Benoît Canet | 0c5e94e | 2014-02-12 17:15:07 +0100 | [diff] [blame] | 860 | /* takes care of avoiding namespaces collisions */ |
| 861 | if (bdrv_find(node_name)) { |
| 862 | error_setg(errp, "node-name=%s is conflicting with a device id", |
| 863 | node_name); |
Kevin Wolf | 636ea37 | 2014-01-24 14:11:52 +0100 | [diff] [blame] | 864 | return; |
Benoît Canet | 0c5e94e | 2014-02-12 17:15:07 +0100 | [diff] [blame] | 865 | } |
| 866 | |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 867 | /* takes care of avoiding duplicates node names */ |
| 868 | if (bdrv_find_node(node_name)) { |
| 869 | error_setg(errp, "Duplicate node name"); |
Kevin Wolf | 636ea37 | 2014-01-24 14:11:52 +0100 | [diff] [blame] | 870 | return; |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 871 | } |
| 872 | |
| 873 | /* copy node name into the bs and insert it into the graph list */ |
| 874 | pstrcpy(bs->node_name, sizeof(bs->node_name), node_name); |
| 875 | QTAILQ_INSERT_TAIL(&graph_bdrv_states, bs, node_list); |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 876 | } |
| 877 | |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 878 | /* |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 879 | * Common part for opening disk images and files |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 880 | * |
| 881 | * Removes all processed options from *options. |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 882 | */ |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 883 | static int bdrv_open_common(BlockDriverState *bs, BlockDriverState *file, |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 884 | QDict *options, int flags, BlockDriver *drv, Error **errp) |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 885 | { |
| 886 | int ret, open_flags; |
Kevin Wolf | 035fccd | 2013-04-09 14:34:19 +0200 | [diff] [blame] | 887 | const char *filename; |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 888 | const char *node_name = NULL; |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 889 | Error *local_err = NULL; |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 890 | |
| 891 | assert(drv != NULL); |
Paolo Bonzini | 6405875 | 2012-05-08 16:51:49 +0200 | [diff] [blame] | 892 | assert(bs->file == NULL); |
Kevin Wolf | 707ff82 | 2013-03-06 12:20:31 +0100 | [diff] [blame] | 893 | assert(options != NULL && bs->options != options); |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 894 | |
Kevin Wolf | 4567367 | 2013-04-22 17:48:40 +0200 | [diff] [blame] | 895 | if (file != NULL) { |
| 896 | filename = file->filename; |
| 897 | } else { |
| 898 | filename = qdict_get_try_str(options, "filename"); |
| 899 | } |
| 900 | |
Kevin Wolf | 765003d | 2014-02-03 14:49:42 +0100 | [diff] [blame] | 901 | if (drv->bdrv_needs_filename && !filename) { |
| 902 | error_setg(errp, "The '%s' block driver requires a file name", |
| 903 | drv->format_name); |
| 904 | return -EINVAL; |
| 905 | } |
| 906 | |
Kevin Wolf | 4567367 | 2013-04-22 17:48:40 +0200 | [diff] [blame] | 907 | trace_bdrv_open_common(bs, filename ?: "", flags, drv->format_name); |
Stefan Hajnoczi | 28dcee1 | 2011-09-22 20:14:12 +0100 | [diff] [blame] | 908 | |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 909 | node_name = qdict_get_try_str(options, "node-name"); |
Kevin Wolf | 636ea37 | 2014-01-24 14:11:52 +0100 | [diff] [blame] | 910 | bdrv_assign_node_name(bs, node_name, &local_err); |
Markus Armbruster | 0fb6395 | 2014-04-25 16:50:31 +0200 | [diff] [blame] | 911 | if (local_err) { |
Kevin Wolf | 636ea37 | 2014-01-24 14:11:52 +0100 | [diff] [blame] | 912 | error_propagate(errp, local_err); |
| 913 | return -EINVAL; |
Benoît Canet | 6913c0c | 2014-01-23 21:31:33 +0100 | [diff] [blame] | 914 | } |
| 915 | qdict_del(options, "node-name"); |
| 916 | |
Kevin Wolf | 5d186eb | 2013-03-27 17:28:18 +0100 | [diff] [blame] | 917 | /* bdrv_open() with directly using a protocol as drv. This layer is already |
| 918 | * opened, so assign it to bs (while file becomes a closed BlockDriverState) |
| 919 | * and return immediately. */ |
| 920 | if (file != NULL && drv->bdrv_file_open) { |
| 921 | bdrv_swap(file, bs); |
| 922 | return 0; |
| 923 | } |
| 924 | |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 925 | bs->open_flags = flags; |
Paolo Bonzini | 1b7fd72 | 2011-11-29 11:35:47 +0100 | [diff] [blame] | 926 | bs->guest_block_size = 512; |
Paolo Bonzini | c25f53b | 2011-11-29 12:42:20 +0100 | [diff] [blame] | 927 | bs->request_alignment = 512; |
Asias He | 0d51b4d | 2013-08-22 15:24:14 +0800 | [diff] [blame] | 928 | bs->zero_beyond_eof = true; |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 929 | open_flags = bdrv_open_flags(bs, flags); |
| 930 | bs->read_only = !(open_flags & BDRV_O_RDWR); |
Kevin Wolf | 20cca27 | 2014-06-04 14:33:27 +0200 | [diff] [blame] | 931 | bs->growable = !!(flags & BDRV_O_PROTOCOL); |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 932 | |
| 933 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv, bs->read_only)) { |
Kevin Wolf | 8f94a6e | 2013-10-10 11:45:55 +0200 | [diff] [blame] | 934 | error_setg(errp, |
| 935 | !bs->read_only && bdrv_is_whitelisted(drv, true) |
| 936 | ? "Driver '%s' can only be used for read-only devices" |
| 937 | : "Driver '%s' is not whitelisted", |
| 938 | drv->format_name); |
Fam Zheng | b64ec4e | 2013-05-29 19:35:40 +0800 | [diff] [blame] | 939 | return -ENOTSUP; |
| 940 | } |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 941 | |
Stefan Hajnoczi | 53fec9d | 2011-11-28 16:08:47 +0000 | [diff] [blame] | 942 | assert(bs->copy_on_read == 0); /* bdrv_new() and bdrv_close() make it so */ |
Kevin Wolf | 0ebd24e | 2013-09-19 15:12:18 +0200 | [diff] [blame] | 943 | if (flags & BDRV_O_COPY_ON_READ) { |
| 944 | if (!bs->read_only) { |
| 945 | bdrv_enable_copy_on_read(bs); |
| 946 | } else { |
| 947 | error_setg(errp, "Can't use copy-on-read on read-only device"); |
| 948 | return -EINVAL; |
| 949 | } |
Stefan Hajnoczi | 53fec9d | 2011-11-28 16:08:47 +0000 | [diff] [blame] | 950 | } |
| 951 | |
Kevin Wolf | c2ad1b0 | 2013-03-18 16:40:51 +0100 | [diff] [blame] | 952 | if (filename != NULL) { |
| 953 | pstrcpy(bs->filename, sizeof(bs->filename), filename); |
| 954 | } else { |
| 955 | bs->filename[0] = '\0'; |
| 956 | } |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 957 | |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 958 | bs->drv = drv; |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 959 | bs->opaque = g_malloc0(drv->instance_size); |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 960 | |
Stefan Hajnoczi | 03f541b | 2011-10-27 10:54:28 +0100 | [diff] [blame] | 961 | bs->enable_write_cache = !!(flags & BDRV_O_CACHE_WB); |
Stefan Hajnoczi | e7c6379 | 2011-10-27 10:54:27 +0100 | [diff] [blame] | 962 | |
Kevin Wolf | 66f82ce | 2010-04-14 14:17:38 +0200 | [diff] [blame] | 963 | /* Open the image, either directly or using a protocol */ |
| 964 | if (drv->bdrv_file_open) { |
Kevin Wolf | 5d186eb | 2013-03-27 17:28:18 +0100 | [diff] [blame] | 965 | assert(file == NULL); |
Benoît Canet | 030be32 | 2013-09-24 17:07:04 +0200 | [diff] [blame] | 966 | assert(!drv->bdrv_needs_filename || filename != NULL); |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 967 | ret = drv->bdrv_file_open(bs, options, open_flags, &local_err); |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 968 | } else { |
Kevin Wolf | 2af5ef7 | 2013-04-09 13:19:18 +0200 | [diff] [blame] | 969 | if (file == NULL) { |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 970 | error_setg(errp, "Can't use '%s' as a block driver for the " |
| 971 | "protocol level", drv->format_name); |
Kevin Wolf | 2af5ef7 | 2013-04-09 13:19:18 +0200 | [diff] [blame] | 972 | ret = -EINVAL; |
| 973 | goto free_and_fail; |
| 974 | } |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 975 | bs->file = file; |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 976 | ret = drv->bdrv_open(bs, options, open_flags, &local_err); |
Kevin Wolf | 66f82ce | 2010-04-14 14:17:38 +0200 | [diff] [blame] | 977 | } |
| 978 | |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 979 | if (ret < 0) { |
Markus Armbruster | 84d18f0 | 2014-01-30 15:07:28 +0100 | [diff] [blame] | 980 | if (local_err) { |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 981 | error_propagate(errp, local_err); |
Dunrong Huang | 2fa9aa5 | 2013-09-24 18:14:01 +0800 | [diff] [blame] | 982 | } else if (bs->filename[0]) { |
| 983 | error_setg_errno(errp, -ret, "Could not open '%s'", bs->filename); |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 984 | } else { |
| 985 | error_setg_errno(errp, -ret, "Could not open image"); |
| 986 | } |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 987 | goto free_and_fail; |
| 988 | } |
| 989 | |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 990 | ret = refresh_total_sectors(bs, bs->total_sectors); |
| 991 | if (ret < 0) { |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 992 | error_setg_errno(errp, -ret, "Could not refresh total sector count"); |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 993 | goto free_and_fail; |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 994 | } |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 995 | |
Kevin Wolf | d34682c | 2013-12-11 19:26:16 +0100 | [diff] [blame] | 996 | bdrv_refresh_limits(bs); |
Paolo Bonzini | c25f53b | 2011-11-29 12:42:20 +0100 | [diff] [blame] | 997 | assert(bdrv_opt_mem_align(bs) != 0); |
Kevin Wolf | 47ea2de | 2014-03-05 15:49:55 +0100 | [diff] [blame] | 998 | assert((bs->request_alignment != 0) || bs->sg); |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 999 | return 0; |
| 1000 | |
| 1001 | free_and_fail: |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 1002 | bs->file = NULL; |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 1003 | g_free(bs->opaque); |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1004 | bs->opaque = NULL; |
| 1005 | bs->drv = NULL; |
| 1006 | return ret; |
| 1007 | } |
| 1008 | |
Kevin Wolf | 5e5c4f6 | 2014-05-26 11:45:08 +0200 | [diff] [blame] | 1009 | static QDict *parse_json_filename(const char *filename, Error **errp) |
| 1010 | { |
| 1011 | QObject *options_obj; |
| 1012 | QDict *options; |
| 1013 | int ret; |
| 1014 | |
| 1015 | ret = strstart(filename, "json:", &filename); |
| 1016 | assert(ret); |
| 1017 | |
| 1018 | options_obj = qobject_from_json(filename); |
| 1019 | if (!options_obj) { |
| 1020 | error_setg(errp, "Could not parse the JSON options"); |
| 1021 | return NULL; |
| 1022 | } |
| 1023 | |
| 1024 | if (qobject_type(options_obj) != QTYPE_QDICT) { |
| 1025 | qobject_decref(options_obj); |
| 1026 | error_setg(errp, "Invalid JSON object given"); |
| 1027 | return NULL; |
| 1028 | } |
| 1029 | |
| 1030 | options = qobject_to_qdict(options_obj); |
| 1031 | qdict_flatten(options); |
| 1032 | |
| 1033 | return options; |
| 1034 | } |
| 1035 | |
Kevin Wolf | 5791533 | 2010-04-14 15:24:50 +0200 | [diff] [blame] | 1036 | /* |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1037 | * Fills in default options for opening images and converts the legacy |
| 1038 | * filename/flags pair to option QDict entries. |
| 1039 | */ |
Kevin Wolf | 5e5c4f6 | 2014-05-26 11:45:08 +0200 | [diff] [blame] | 1040 | static int bdrv_fill_options(QDict **options, const char **pfilename, int flags, |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 1041 | BlockDriver *drv, Error **errp) |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1042 | { |
Kevin Wolf | 5e5c4f6 | 2014-05-26 11:45:08 +0200 | [diff] [blame] | 1043 | const char *filename = *pfilename; |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1044 | const char *drvname; |
Kevin Wolf | 462f5bc | 2014-05-26 11:39:55 +0200 | [diff] [blame] | 1045 | bool protocol = flags & BDRV_O_PROTOCOL; |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1046 | bool parse_filename = false; |
| 1047 | Error *local_err = NULL; |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1048 | |
Kevin Wolf | 5e5c4f6 | 2014-05-26 11:45:08 +0200 | [diff] [blame] | 1049 | /* Parse json: pseudo-protocol */ |
| 1050 | if (filename && g_str_has_prefix(filename, "json:")) { |
| 1051 | QDict *json_options = parse_json_filename(filename, &local_err); |
| 1052 | if (local_err) { |
| 1053 | error_propagate(errp, local_err); |
| 1054 | return -EINVAL; |
| 1055 | } |
| 1056 | |
| 1057 | /* Options given in the filename have lower priority than options |
| 1058 | * specified directly */ |
| 1059 | qdict_join(*options, json_options, false); |
| 1060 | QDECREF(json_options); |
| 1061 | *pfilename = filename = NULL; |
| 1062 | } |
| 1063 | |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1064 | /* Fetch the file name from the options QDict if necessary */ |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 1065 | if (protocol && filename) { |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1066 | if (!qdict_haskey(*options, "filename")) { |
| 1067 | qdict_put(*options, "filename", qstring_from_str(filename)); |
| 1068 | parse_filename = true; |
| 1069 | } else { |
| 1070 | error_setg(errp, "Can't specify 'file' and 'filename' options at " |
| 1071 | "the same time"); |
| 1072 | return -EINVAL; |
| 1073 | } |
| 1074 | } |
| 1075 | |
| 1076 | /* Find the right block driver */ |
| 1077 | filename = qdict_get_try_str(*options, "filename"); |
| 1078 | drvname = qdict_get_try_str(*options, "driver"); |
| 1079 | |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 1080 | if (drv) { |
| 1081 | if (drvname) { |
| 1082 | error_setg(errp, "Driver specified twice"); |
| 1083 | return -EINVAL; |
| 1084 | } |
| 1085 | drvname = drv->format_name; |
| 1086 | qdict_put(*options, "driver", qstring_from_str(drvname)); |
| 1087 | } else { |
| 1088 | if (!drvname && protocol) { |
| 1089 | if (filename) { |
| 1090 | drv = bdrv_find_protocol(filename, parse_filename); |
| 1091 | if (!drv) { |
| 1092 | error_setg(errp, "Unknown protocol"); |
| 1093 | return -EINVAL; |
| 1094 | } |
| 1095 | |
| 1096 | drvname = drv->format_name; |
| 1097 | qdict_put(*options, "driver", qstring_from_str(drvname)); |
| 1098 | } else { |
| 1099 | error_setg(errp, "Must specify either driver or file"); |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1100 | return -EINVAL; |
| 1101 | } |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 1102 | } else if (drvname) { |
| 1103 | drv = bdrv_find_format(drvname); |
| 1104 | if (!drv) { |
| 1105 | error_setg(errp, "Unknown driver '%s'", drvname); |
| 1106 | return -ENOENT; |
| 1107 | } |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1108 | } |
| 1109 | } |
| 1110 | |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 1111 | assert(drv || !protocol); |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1112 | |
| 1113 | /* Driver-specific filename parsing */ |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 1114 | if (drv && drv->bdrv_parse_filename && parse_filename) { |
Kevin Wolf | f54120f | 2014-05-26 11:09:59 +0200 | [diff] [blame] | 1115 | drv->bdrv_parse_filename(filename, *options, &local_err); |
| 1116 | if (local_err) { |
| 1117 | error_propagate(errp, local_err); |
| 1118 | return -EINVAL; |
| 1119 | } |
| 1120 | |
| 1121 | if (!drv->bdrv_needs_filename) { |
| 1122 | qdict_del(*options, "filename"); |
| 1123 | } |
| 1124 | } |
| 1125 | |
| 1126 | return 0; |
| 1127 | } |
| 1128 | |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 1129 | void bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd) |
| 1130 | { |
| 1131 | |
Fam Zheng | 826b6ca | 2014-05-23 21:29:47 +0800 | [diff] [blame] | 1132 | if (bs->backing_hd) { |
| 1133 | assert(bs->backing_blocker); |
| 1134 | bdrv_op_unblock_all(bs->backing_hd, bs->backing_blocker); |
| 1135 | } else if (backing_hd) { |
| 1136 | error_setg(&bs->backing_blocker, |
| 1137 | "device is used as backing hd of '%s'", |
| 1138 | bs->device_name); |
| 1139 | } |
| 1140 | |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 1141 | bs->backing_hd = backing_hd; |
| 1142 | if (!backing_hd) { |
Fam Zheng | 826b6ca | 2014-05-23 21:29:47 +0800 | [diff] [blame] | 1143 | error_free(bs->backing_blocker); |
| 1144 | bs->backing_blocker = NULL; |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 1145 | goto out; |
| 1146 | } |
| 1147 | bs->open_flags &= ~BDRV_O_NO_BACKING; |
| 1148 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_hd->filename); |
| 1149 | pstrcpy(bs->backing_format, sizeof(bs->backing_format), |
| 1150 | backing_hd->drv ? backing_hd->drv->format_name : ""); |
Fam Zheng | 826b6ca | 2014-05-23 21:29:47 +0800 | [diff] [blame] | 1151 | |
| 1152 | bdrv_op_block_all(bs->backing_hd, bs->backing_blocker); |
| 1153 | /* Otherwise we won't be able to commit due to check in bdrv_commit */ |
| 1154 | bdrv_op_unblock(bs->backing_hd, BLOCK_OP_TYPE_COMMIT, |
| 1155 | bs->backing_blocker); |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 1156 | out: |
| 1157 | bdrv_refresh_limits(bs); |
| 1158 | } |
| 1159 | |
Kevin Wolf | 31ca6d0 | 2013-03-28 15:29:24 +0100 | [diff] [blame] | 1160 | /* |
| 1161 | * Opens the backing file for a BlockDriverState if not yet open |
| 1162 | * |
| 1163 | * options is a QDict of options to pass to the block drivers, or NULL for an |
| 1164 | * empty set of options. The reference to the QDict is transferred to this |
| 1165 | * function (even on failure), so if the caller intends to reuse the dictionary, |
| 1166 | * it needs to use QINCREF() before calling bdrv_file_open. |
| 1167 | */ |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 1168 | int bdrv_open_backing_file(BlockDriverState *bs, QDict *options, Error **errp) |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 1169 | { |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1170 | char *backing_filename = g_malloc0(PATH_MAX); |
Kevin Wolf | 317fc44 | 2014-04-25 13:27:34 +0200 | [diff] [blame] | 1171 | int ret = 0; |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 1172 | BlockDriver *back_drv = NULL; |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 1173 | BlockDriverState *backing_hd; |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 1174 | Error *local_err = NULL; |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 1175 | |
| 1176 | if (bs->backing_hd != NULL) { |
Kevin Wolf | 31ca6d0 | 2013-03-28 15:29:24 +0100 | [diff] [blame] | 1177 | QDECREF(options); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1178 | goto free_exit; |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 1179 | } |
| 1180 | |
Kevin Wolf | 31ca6d0 | 2013-03-28 15:29:24 +0100 | [diff] [blame] | 1181 | /* NULL means an empty set of options */ |
| 1182 | if (options == NULL) { |
| 1183 | options = qdict_new(); |
| 1184 | } |
| 1185 | |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 1186 | bs->open_flags &= ~BDRV_O_NO_BACKING; |
Kevin Wolf | 1cb6f50 | 2013-04-12 20:27:07 +0200 | [diff] [blame] | 1187 | if (qdict_haskey(options, "file.filename")) { |
| 1188 | backing_filename[0] = '\0'; |
| 1189 | } else if (bs->backing_file[0] == '\0' && qdict_size(options) == 0) { |
Kevin Wolf | 31ca6d0 | 2013-03-28 15:29:24 +0100 | [diff] [blame] | 1190 | QDECREF(options); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1191 | goto free_exit; |
Fam Zheng | dbecebd | 2013-09-22 20:05:06 +0800 | [diff] [blame] | 1192 | } else { |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1193 | bdrv_get_full_backing_filename(bs, backing_filename, PATH_MAX); |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 1194 | } |
| 1195 | |
Kevin Wolf | 8ee79e7 | 2014-06-04 15:09:35 +0200 | [diff] [blame] | 1196 | if (!bs->drv || !bs->drv->supports_backing) { |
| 1197 | ret = -EINVAL; |
| 1198 | error_setg(errp, "Driver doesn't support backing files"); |
| 1199 | QDECREF(options); |
| 1200 | goto free_exit; |
| 1201 | } |
| 1202 | |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 1203 | backing_hd = bdrv_new("", errp); |
| 1204 | |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 1205 | if (bs->backing_format[0] != '\0') { |
| 1206 | back_drv = bdrv_find_format(bs->backing_format); |
| 1207 | } |
| 1208 | |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 1209 | assert(bs->backing_hd == NULL); |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 1210 | ret = bdrv_open(&backing_hd, |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 1211 | *backing_filename ? backing_filename : NULL, NULL, options, |
Kevin Wolf | 317fc44 | 2014-04-25 13:27:34 +0200 | [diff] [blame] | 1212 | bdrv_backing_flags(bs->open_flags), back_drv, &local_err); |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 1213 | if (ret < 0) { |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 1214 | bdrv_unref(backing_hd); |
| 1215 | backing_hd = NULL; |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 1216 | bs->open_flags |= BDRV_O_NO_BACKING; |
Fam Zheng | b04b6b6 | 2013-11-08 11:26:49 +0800 | [diff] [blame] | 1217 | error_setg(errp, "Could not open backing file: %s", |
| 1218 | error_get_pretty(local_err)); |
| 1219 | error_free(local_err); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1220 | goto free_exit; |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 1221 | } |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 1222 | bdrv_set_backing_hd(bs, backing_hd); |
Peter Feiner | d80ac65 | 2014-01-08 19:43:25 +0000 | [diff] [blame] | 1223 | |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1224 | free_exit: |
| 1225 | g_free(backing_filename); |
| 1226 | return ret; |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 1227 | } |
| 1228 | |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1229 | /* |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 1230 | * Opens a disk image whose options are given as BlockdevRef in another block |
| 1231 | * device's options. |
| 1232 | * |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 1233 | * If allow_none is true, no image will be opened if filename is false and no |
| 1234 | * BlockdevRef is given. *pbs will remain unchanged and 0 will be returned. |
| 1235 | * |
| 1236 | * bdrev_key specifies the key for the image's BlockdevRef in the options QDict. |
| 1237 | * That QDict has to be flattened; therefore, if the BlockdevRef is a QDict |
| 1238 | * itself, all options starting with "${bdref_key}." are considered part of the |
| 1239 | * BlockdevRef. |
| 1240 | * |
| 1241 | * The BlockdevRef will be removed from the options QDict. |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 1242 | * |
| 1243 | * To conform with the behavior of bdrv_open(), *pbs has to be NULL. |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 1244 | */ |
| 1245 | int bdrv_open_image(BlockDriverState **pbs, const char *filename, |
| 1246 | QDict *options, const char *bdref_key, int flags, |
Max Reitz | f7d9fd8 | 2014-02-18 18:33:12 +0100 | [diff] [blame] | 1247 | bool allow_none, Error **errp) |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 1248 | { |
| 1249 | QDict *image_options; |
| 1250 | int ret; |
| 1251 | char *bdref_key_dot; |
| 1252 | const char *reference; |
| 1253 | |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 1254 | assert(pbs); |
| 1255 | assert(*pbs == NULL); |
| 1256 | |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 1257 | bdref_key_dot = g_strdup_printf("%s.", bdref_key); |
| 1258 | qdict_extract_subqdict(options, &image_options, bdref_key_dot); |
| 1259 | g_free(bdref_key_dot); |
| 1260 | |
| 1261 | reference = qdict_get_try_str(options, bdref_key); |
| 1262 | if (!filename && !reference && !qdict_size(image_options)) { |
| 1263 | if (allow_none) { |
| 1264 | ret = 0; |
| 1265 | } else { |
| 1266 | error_setg(errp, "A block device must be specified for \"%s\"", |
| 1267 | bdref_key); |
| 1268 | ret = -EINVAL; |
| 1269 | } |
Markus Armbruster | b20e61e | 2014-05-28 11:16:57 +0200 | [diff] [blame] | 1270 | QDECREF(image_options); |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 1271 | goto done; |
| 1272 | } |
| 1273 | |
Max Reitz | f7d9fd8 | 2014-02-18 18:33:12 +0100 | [diff] [blame] | 1274 | ret = bdrv_open(pbs, filename, reference, image_options, flags, NULL, errp); |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 1275 | |
| 1276 | done: |
| 1277 | qdict_del(options, bdref_key); |
| 1278 | return ret; |
| 1279 | } |
| 1280 | |
Chen Gang | 6b8aeca | 2014-06-23 23:28:23 +0800 | [diff] [blame] | 1281 | int bdrv_append_temp_snapshot(BlockDriverState *bs, int flags, Error **errp) |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1282 | { |
| 1283 | /* TODO: extra byte is a hack to ensure MAX_PATH space on Windows. */ |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1284 | char *tmp_filename = g_malloc0(PATH_MAX + 1); |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1285 | int64_t total_size; |
| 1286 | BlockDriver *bdrv_qcow2; |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 1287 | QemuOpts *opts = NULL; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1288 | QDict *snapshot_options; |
| 1289 | BlockDriverState *bs_snapshot; |
| 1290 | Error *local_err; |
| 1291 | int ret; |
| 1292 | |
| 1293 | /* if snapshot, we create a temporary backing file and open it |
| 1294 | instead of opening 'filename' directly */ |
| 1295 | |
| 1296 | /* Get the required size from the image */ |
Kevin Wolf | f187743 | 2014-04-04 17:07:19 +0200 | [diff] [blame] | 1297 | total_size = bdrv_getlength(bs); |
| 1298 | if (total_size < 0) { |
Chen Gang | 6b8aeca | 2014-06-23 23:28:23 +0800 | [diff] [blame] | 1299 | ret = total_size; |
Kevin Wolf | f187743 | 2014-04-04 17:07:19 +0200 | [diff] [blame] | 1300 | error_setg_errno(errp, -total_size, "Could not get image size"); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1301 | goto out; |
Kevin Wolf | f187743 | 2014-04-04 17:07:19 +0200 | [diff] [blame] | 1302 | } |
| 1303 | total_size &= BDRV_SECTOR_MASK; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1304 | |
| 1305 | /* Create the temporary image */ |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1306 | ret = get_tmp_filename(tmp_filename, PATH_MAX + 1); |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1307 | if (ret < 0) { |
| 1308 | error_setg_errno(errp, -ret, "Could not get temporary filename"); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1309 | goto out; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1310 | } |
| 1311 | |
| 1312 | bdrv_qcow2 = bdrv_find_format("qcow2"); |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 1313 | opts = qemu_opts_create(bdrv_qcow2->create_opts, NULL, 0, |
| 1314 | &error_abort); |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 1315 | qemu_opt_set_number(opts, BLOCK_OPT_SIZE, total_size); |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 1316 | ret = bdrv_create(bdrv_qcow2, tmp_filename, opts, &local_err); |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 1317 | qemu_opts_del(opts); |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1318 | if (ret < 0) { |
| 1319 | error_setg_errno(errp, -ret, "Could not create temporary overlay " |
| 1320 | "'%s': %s", tmp_filename, |
| 1321 | error_get_pretty(local_err)); |
| 1322 | error_free(local_err); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1323 | goto out; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1324 | } |
| 1325 | |
| 1326 | /* Prepare a new options QDict for the temporary file */ |
| 1327 | snapshot_options = qdict_new(); |
| 1328 | qdict_put(snapshot_options, "file.driver", |
| 1329 | qstring_from_str("file")); |
| 1330 | qdict_put(snapshot_options, "file.filename", |
| 1331 | qstring_from_str(tmp_filename)); |
| 1332 | |
Kevin Wolf | 98522f6 | 2014-04-17 13:16:01 +0200 | [diff] [blame] | 1333 | bs_snapshot = bdrv_new("", &error_abort); |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1334 | |
| 1335 | ret = bdrv_open(&bs_snapshot, NULL, NULL, snapshot_options, |
Kevin Wolf | b1e6fc0 | 2014-05-06 12:11:42 +0200 | [diff] [blame] | 1336 | flags, bdrv_qcow2, &local_err); |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1337 | if (ret < 0) { |
| 1338 | error_propagate(errp, local_err); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1339 | goto out; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1340 | } |
| 1341 | |
| 1342 | bdrv_append(bs_snapshot, bs); |
Benoît Canet | 1ba4b6a | 2014-04-22 17:05:27 +0200 | [diff] [blame] | 1343 | |
| 1344 | out: |
| 1345 | g_free(tmp_filename); |
Chen Gang | 6b8aeca | 2014-06-23 23:28:23 +0800 | [diff] [blame] | 1346 | return ret; |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1347 | } |
| 1348 | |
Max Reitz | da557aa | 2013-12-20 19:28:11 +0100 | [diff] [blame] | 1349 | /* |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1350 | * Opens a disk image (raw, qcow2, vmdk, ...) |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 1351 | * |
| 1352 | * options is a QDict of options to pass to the block drivers, or NULL for an |
| 1353 | * empty set of options. The reference to the QDict belongs to the block layer |
| 1354 | * after the call (even on failure), so if the caller intends to reuse the |
| 1355 | * dictionary, it needs to use QINCREF() before calling bdrv_open. |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 1356 | * |
| 1357 | * If *pbs is NULL, a new BDS will be created with a pointer to it stored there. |
| 1358 | * If it is not NULL, the referenced BDS will be reused. |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 1359 | * |
| 1360 | * The reference parameter may be used to specify an existing block device which |
| 1361 | * should be opened. If specified, neither options nor a filename may be given, |
| 1362 | * nor can an existing BDS be reused (that is, *pbs has to be NULL). |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1363 | */ |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 1364 | int bdrv_open(BlockDriverState **pbs, const char *filename, |
| 1365 | const char *reference, QDict *options, int flags, |
| 1366 | BlockDriver *drv, Error **errp) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 1367 | { |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1368 | int ret; |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 1369 | BlockDriverState *file = NULL, *bs; |
Kevin Wolf | 74fe54f | 2013-07-09 11:09:02 +0200 | [diff] [blame] | 1370 | const char *drvname; |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 1371 | Error *local_err = NULL; |
Kevin Wolf | b1e6fc0 | 2014-05-06 12:11:42 +0200 | [diff] [blame] | 1372 | int snapshot_flags = 0; |
bellard | 712e787 | 2005-04-28 21:09:32 +0000 | [diff] [blame] | 1373 | |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 1374 | assert(pbs); |
| 1375 | |
Max Reitz | ddf5636 | 2014-02-18 18:33:06 +0100 | [diff] [blame] | 1376 | if (reference) { |
| 1377 | bool options_non_empty = options ? qdict_size(options) : false; |
| 1378 | QDECREF(options); |
| 1379 | |
| 1380 | if (*pbs) { |
| 1381 | error_setg(errp, "Cannot reuse an existing BDS when referencing " |
| 1382 | "another block device"); |
| 1383 | return -EINVAL; |
| 1384 | } |
| 1385 | |
| 1386 | if (filename || options_non_empty) { |
| 1387 | error_setg(errp, "Cannot reference an existing block device with " |
| 1388 | "additional options or a new filename"); |
| 1389 | return -EINVAL; |
| 1390 | } |
| 1391 | |
| 1392 | bs = bdrv_lookup_bs(reference, reference, errp); |
| 1393 | if (!bs) { |
| 1394 | return -ENODEV; |
| 1395 | } |
| 1396 | bdrv_ref(bs); |
| 1397 | *pbs = bs; |
| 1398 | return 0; |
| 1399 | } |
| 1400 | |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 1401 | if (*pbs) { |
| 1402 | bs = *pbs; |
| 1403 | } else { |
Kevin Wolf | 98522f6 | 2014-04-17 13:16:01 +0200 | [diff] [blame] | 1404 | bs = bdrv_new("", &error_abort); |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 1405 | } |
| 1406 | |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 1407 | /* NULL means an empty set of options */ |
| 1408 | if (options == NULL) { |
| 1409 | options = qdict_new(); |
| 1410 | } |
| 1411 | |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 1412 | ret = bdrv_fill_options(&options, &filename, flags, drv, &local_err); |
Kevin Wolf | 462f5bc | 2014-05-26 11:39:55 +0200 | [diff] [blame] | 1413 | if (local_err) { |
| 1414 | goto fail; |
| 1415 | } |
| 1416 | |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 1417 | /* Find the right image format driver */ |
| 1418 | drv = NULL; |
| 1419 | drvname = qdict_get_try_str(options, "driver"); |
| 1420 | if (drvname) { |
| 1421 | drv = bdrv_find_format(drvname); |
| 1422 | qdict_del(options, "driver"); |
| 1423 | if (!drv) { |
| 1424 | error_setg(errp, "Unknown driver: '%s'", drvname); |
| 1425 | ret = -EINVAL; |
| 1426 | goto fail; |
| 1427 | } |
| 1428 | } |
| 1429 | |
| 1430 | assert(drvname || !(flags & BDRV_O_PROTOCOL)); |
| 1431 | if (drv && !drv->bdrv_file_open) { |
| 1432 | /* If the user explicitly wants a format driver here, we'll need to add |
| 1433 | * another layer for the protocol in bs->file */ |
| 1434 | flags &= ~BDRV_O_PROTOCOL; |
| 1435 | } |
| 1436 | |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 1437 | bs->options = options; |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 1438 | options = qdict_clone_shallow(options); |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 1439 | |
Kevin Wolf | f4788ad | 2014-06-03 16:44:19 +0200 | [diff] [blame] | 1440 | /* Open image file without format layer */ |
| 1441 | if ((flags & BDRV_O_PROTOCOL) == 0) { |
| 1442 | if (flags & BDRV_O_RDWR) { |
| 1443 | flags |= BDRV_O_ALLOW_RDWR; |
| 1444 | } |
| 1445 | if (flags & BDRV_O_SNAPSHOT) { |
| 1446 | snapshot_flags = bdrv_temp_snapshot_flags(flags); |
| 1447 | flags = bdrv_backing_flags(flags); |
| 1448 | } |
| 1449 | |
| 1450 | assert(file == NULL); |
| 1451 | ret = bdrv_open_image(&file, filename, options, "file", |
| 1452 | bdrv_inherited_flags(flags), |
| 1453 | true, &local_err); |
| 1454 | if (ret < 0) { |
Max Reitz | 5469a2a | 2014-02-18 18:33:10 +0100 | [diff] [blame] | 1455 | goto fail; |
| 1456 | } |
| 1457 | } |
| 1458 | |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 1459 | /* Image format probing */ |
| 1460 | if (!drv && file) { |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 1461 | ret = find_image_format(file, filename, &drv, &local_err); |
| 1462 | if (ret < 0) { |
Kevin Wolf | 8bfea15 | 2014-04-11 19:16:36 +0200 | [diff] [blame] | 1463 | goto fail; |
Max Reitz | 2a05cbe | 2013-12-20 19:28:10 +0100 | [diff] [blame] | 1464 | } |
Kevin Wolf | 76c591b | 2014-06-04 14:19:44 +0200 | [diff] [blame] | 1465 | } else if (!drv) { |
Kevin Wolf | 17b005f | 2014-05-27 10:50:29 +0200 | [diff] [blame] | 1466 | error_setg(errp, "Must specify either driver or file"); |
| 1467 | ret = -EINVAL; |
Kevin Wolf | 8bfea15 | 2014-04-11 19:16:36 +0200 | [diff] [blame] | 1468 | goto fail; |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 1469 | } |
| 1470 | |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1471 | /* Open the image */ |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 1472 | ret = bdrv_open_common(bs, file, options, flags, drv, &local_err); |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1473 | if (ret < 0) { |
Kevin Wolf | 8bfea15 | 2014-04-11 19:16:36 +0200 | [diff] [blame] | 1474 | goto fail; |
Christoph Hellwig | 6987307 | 2010-01-20 18:13:25 +0100 | [diff] [blame] | 1475 | } |
| 1476 | |
Max Reitz | 2a05cbe | 2013-12-20 19:28:10 +0100 | [diff] [blame] | 1477 | if (file && (bs->file != file)) { |
Fam Zheng | 4f6fd34 | 2013-08-23 09:14:47 +0800 | [diff] [blame] | 1478 | bdrv_unref(file); |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 1479 | file = NULL; |
| 1480 | } |
| 1481 | |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1482 | /* If there is a backing file, use it */ |
Paolo Bonzini | 9156df1 | 2012-10-18 16:49:17 +0200 | [diff] [blame] | 1483 | if ((flags & BDRV_O_NO_BACKING) == 0) { |
Kevin Wolf | 31ca6d0 | 2013-03-28 15:29:24 +0100 | [diff] [blame] | 1484 | QDict *backing_options; |
| 1485 | |
Benoît Canet | 5726d87 | 2013-09-25 13:30:01 +0200 | [diff] [blame] | 1486 | qdict_extract_subqdict(options, &backing_options, "backing."); |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 1487 | ret = bdrv_open_backing_file(bs, backing_options, &local_err); |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1488 | if (ret < 0) { |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 1489 | goto close_and_fail; |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1490 | } |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1491 | } |
| 1492 | |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1493 | /* For snapshot=on, create a temporary qcow2 overlay. bs points to the |
| 1494 | * temporary snapshot afterwards. */ |
Kevin Wolf | b1e6fc0 | 2014-05-06 12:11:42 +0200 | [diff] [blame] | 1495 | if (snapshot_flags) { |
Chen Gang | 6b8aeca | 2014-06-23 23:28:23 +0800 | [diff] [blame] | 1496 | ret = bdrv_append_temp_snapshot(bs, snapshot_flags, &local_err); |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1497 | if (local_err) { |
Kevin Wolf | b998875 | 2014-04-03 12:09:34 +0200 | [diff] [blame] | 1498 | goto close_and_fail; |
| 1499 | } |
| 1500 | } |
| 1501 | |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 1502 | /* Check if any unknown options were used */ |
Max Reitz | 5acd9d8 | 2014-02-18 18:33:11 +0100 | [diff] [blame] | 1503 | if (options && (qdict_size(options) != 0)) { |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 1504 | const QDictEntry *entry = qdict_first(options); |
Max Reitz | 5acd9d8 | 2014-02-18 18:33:11 +0100 | [diff] [blame] | 1505 | if (flags & BDRV_O_PROTOCOL) { |
| 1506 | error_setg(errp, "Block protocol '%s' doesn't support the option " |
| 1507 | "'%s'", drv->format_name, entry->key); |
| 1508 | } else { |
| 1509 | error_setg(errp, "Block format '%s' used by device '%s' doesn't " |
| 1510 | "support the option '%s'", drv->format_name, |
| 1511 | bs->device_name, entry->key); |
| 1512 | } |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 1513 | |
| 1514 | ret = -EINVAL; |
| 1515 | goto close_and_fail; |
| 1516 | } |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 1517 | |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1518 | if (!bdrv_key_required(bs)) { |
Markus Armbruster | 7d4b4ba | 2011-09-06 18:58:59 +0200 | [diff] [blame] | 1519 | bdrv_dev_change_media_cb(bs, true); |
Markus Armbruster | c3adb58 | 2014-03-14 09:22:48 +0100 | [diff] [blame] | 1520 | } else if (!runstate_check(RUN_STATE_PRELAUNCH) |
| 1521 | && !runstate_check(RUN_STATE_INMIGRATE) |
| 1522 | && !runstate_check(RUN_STATE_PAUSED)) { /* HACK */ |
| 1523 | error_setg(errp, |
| 1524 | "Guest must be stopped for opening of encrypted image"); |
| 1525 | ret = -EBUSY; |
| 1526 | goto close_and_fail; |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1527 | } |
| 1528 | |
Markus Armbruster | c3adb58 | 2014-03-14 09:22:48 +0100 | [diff] [blame] | 1529 | QDECREF(options); |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 1530 | *pbs = bs; |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1531 | return 0; |
| 1532 | |
Kevin Wolf | 8bfea15 | 2014-04-11 19:16:36 +0200 | [diff] [blame] | 1533 | fail: |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 1534 | if (file != NULL) { |
Fam Zheng | 4f6fd34 | 2013-08-23 09:14:47 +0800 | [diff] [blame] | 1535 | bdrv_unref(file); |
Kevin Wolf | f500a6d | 2012-11-12 17:35:27 +0100 | [diff] [blame] | 1536 | } |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 1537 | QDECREF(bs->options); |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 1538 | QDECREF(options); |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 1539 | bs->options = NULL; |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 1540 | if (!*pbs) { |
| 1541 | /* If *pbs is NULL, a new BDS has been created in this function and |
| 1542 | needs to be freed now. Otherwise, it does not need to be closed, |
| 1543 | since it has not really been opened yet. */ |
| 1544 | bdrv_unref(bs); |
| 1545 | } |
Markus Armbruster | 84d18f0 | 2014-01-30 15:07:28 +0100 | [diff] [blame] | 1546 | if (local_err) { |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 1547 | error_propagate(errp, local_err); |
| 1548 | } |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 1549 | return ret; |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 1550 | |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 1551 | close_and_fail: |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 1552 | /* See fail path, but now the BDS has to be always closed */ |
| 1553 | if (*pbs) { |
| 1554 | bdrv_close(bs); |
| 1555 | } else { |
| 1556 | bdrv_unref(bs); |
| 1557 | } |
Kevin Wolf | b6ad491 | 2013-03-15 10:35:04 +0100 | [diff] [blame] | 1558 | QDECREF(options); |
Markus Armbruster | 84d18f0 | 2014-01-30 15:07:28 +0100 | [diff] [blame] | 1559 | if (local_err) { |
Max Reitz | 34b5d2c | 2013-09-05 14:45:29 +0200 | [diff] [blame] | 1560 | error_propagate(errp, local_err); |
| 1561 | } |
Kevin Wolf | b6ce07a | 2010-04-12 16:37:13 +0200 | [diff] [blame] | 1562 | return ret; |
| 1563 | } |
| 1564 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 1565 | typedef struct BlockReopenQueueEntry { |
| 1566 | bool prepared; |
| 1567 | BDRVReopenState state; |
| 1568 | QSIMPLEQ_ENTRY(BlockReopenQueueEntry) entry; |
| 1569 | } BlockReopenQueueEntry; |
| 1570 | |
| 1571 | /* |
| 1572 | * Adds a BlockDriverState to a simple queue for an atomic, transactional |
| 1573 | * reopen of multiple devices. |
| 1574 | * |
| 1575 | * bs_queue can either be an existing BlockReopenQueue that has had QSIMPLE_INIT |
| 1576 | * already performed, or alternatively may be NULL a new BlockReopenQueue will |
| 1577 | * be created and initialized. This newly created BlockReopenQueue should be |
| 1578 | * passed back in for subsequent calls that are intended to be of the same |
| 1579 | * atomic 'set'. |
| 1580 | * |
| 1581 | * bs is the BlockDriverState to add to the reopen queue. |
| 1582 | * |
| 1583 | * flags contains the open flags for the associated bs |
| 1584 | * |
| 1585 | * returns a pointer to bs_queue, which is either the newly allocated |
| 1586 | * bs_queue, or the existing bs_queue being used. |
| 1587 | * |
| 1588 | */ |
| 1589 | BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue, |
| 1590 | BlockDriverState *bs, int flags) |
| 1591 | { |
| 1592 | assert(bs != NULL); |
| 1593 | |
| 1594 | BlockReopenQueueEntry *bs_entry; |
| 1595 | if (bs_queue == NULL) { |
| 1596 | bs_queue = g_new0(BlockReopenQueue, 1); |
| 1597 | QSIMPLEQ_INIT(bs_queue); |
| 1598 | } |
| 1599 | |
Kevin Wolf | f1f25a2 | 2014-04-25 19:04:55 +0200 | [diff] [blame] | 1600 | /* bdrv_open() masks this flag out */ |
| 1601 | flags &= ~BDRV_O_PROTOCOL; |
| 1602 | |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 1603 | if (bs->file) { |
Kevin Wolf | f1f25a2 | 2014-04-25 19:04:55 +0200 | [diff] [blame] | 1604 | bdrv_reopen_queue(bs_queue, bs->file, bdrv_inherited_flags(flags)); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 1605 | } |
| 1606 | |
| 1607 | bs_entry = g_new0(BlockReopenQueueEntry, 1); |
| 1608 | QSIMPLEQ_INSERT_TAIL(bs_queue, bs_entry, entry); |
| 1609 | |
| 1610 | bs_entry->state.bs = bs; |
| 1611 | bs_entry->state.flags = flags; |
| 1612 | |
| 1613 | return bs_queue; |
| 1614 | } |
| 1615 | |
| 1616 | /* |
| 1617 | * Reopen multiple BlockDriverStates atomically & transactionally. |
| 1618 | * |
| 1619 | * The queue passed in (bs_queue) must have been built up previous |
| 1620 | * via bdrv_reopen_queue(). |
| 1621 | * |
| 1622 | * Reopens all BDS specified in the queue, with the appropriate |
| 1623 | * flags. All devices are prepared for reopen, and failure of any |
| 1624 | * device will cause all device changes to be abandonded, and intermediate |
| 1625 | * data cleaned up. |
| 1626 | * |
| 1627 | * If all devices prepare successfully, then the changes are committed |
| 1628 | * to all devices. |
| 1629 | * |
| 1630 | */ |
| 1631 | int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp) |
| 1632 | { |
| 1633 | int ret = -1; |
| 1634 | BlockReopenQueueEntry *bs_entry, *next; |
| 1635 | Error *local_err = NULL; |
| 1636 | |
| 1637 | assert(bs_queue != NULL); |
| 1638 | |
| 1639 | bdrv_drain_all(); |
| 1640 | |
| 1641 | QSIMPLEQ_FOREACH(bs_entry, bs_queue, entry) { |
| 1642 | if (bdrv_reopen_prepare(&bs_entry->state, bs_queue, &local_err)) { |
| 1643 | error_propagate(errp, local_err); |
| 1644 | goto cleanup; |
| 1645 | } |
| 1646 | bs_entry->prepared = true; |
| 1647 | } |
| 1648 | |
| 1649 | /* If we reach this point, we have success and just need to apply the |
| 1650 | * changes |
| 1651 | */ |
| 1652 | QSIMPLEQ_FOREACH(bs_entry, bs_queue, entry) { |
| 1653 | bdrv_reopen_commit(&bs_entry->state); |
| 1654 | } |
| 1655 | |
| 1656 | ret = 0; |
| 1657 | |
| 1658 | cleanup: |
| 1659 | QSIMPLEQ_FOREACH_SAFE(bs_entry, bs_queue, entry, next) { |
| 1660 | if (ret && bs_entry->prepared) { |
| 1661 | bdrv_reopen_abort(&bs_entry->state); |
| 1662 | } |
| 1663 | g_free(bs_entry); |
| 1664 | } |
| 1665 | g_free(bs_queue); |
| 1666 | return ret; |
| 1667 | } |
| 1668 | |
| 1669 | |
| 1670 | /* Reopen a single BlockDriverState with the specified flags. */ |
| 1671 | int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp) |
| 1672 | { |
| 1673 | int ret = -1; |
| 1674 | Error *local_err = NULL; |
| 1675 | BlockReopenQueue *queue = bdrv_reopen_queue(NULL, bs, bdrv_flags); |
| 1676 | |
| 1677 | ret = bdrv_reopen_multiple(queue, &local_err); |
| 1678 | if (local_err != NULL) { |
| 1679 | error_propagate(errp, local_err); |
| 1680 | } |
| 1681 | return ret; |
| 1682 | } |
| 1683 | |
| 1684 | |
| 1685 | /* |
| 1686 | * Prepares a BlockDriverState for reopen. All changes are staged in the |
| 1687 | * 'opaque' field of the BDRVReopenState, which is used and allocated by |
| 1688 | * the block driver layer .bdrv_reopen_prepare() |
| 1689 | * |
| 1690 | * bs is the BlockDriverState to reopen |
| 1691 | * flags are the new open flags |
| 1692 | * queue is the reopen queue |
| 1693 | * |
| 1694 | * Returns 0 on success, non-zero on error. On error errp will be set |
| 1695 | * as well. |
| 1696 | * |
| 1697 | * On failure, bdrv_reopen_abort() will be called to clean up any data. |
| 1698 | * It is the responsibility of the caller to then call the abort() or |
| 1699 | * commit() for any other BDS that have been left in a prepare() state |
| 1700 | * |
| 1701 | */ |
| 1702 | int bdrv_reopen_prepare(BDRVReopenState *reopen_state, BlockReopenQueue *queue, |
| 1703 | Error **errp) |
| 1704 | { |
| 1705 | int ret = -1; |
| 1706 | Error *local_err = NULL; |
| 1707 | BlockDriver *drv; |
| 1708 | |
| 1709 | assert(reopen_state != NULL); |
| 1710 | assert(reopen_state->bs->drv != NULL); |
| 1711 | drv = reopen_state->bs->drv; |
| 1712 | |
| 1713 | /* if we are to stay read-only, do not allow permission change |
| 1714 | * to r/w */ |
| 1715 | if (!(reopen_state->bs->open_flags & BDRV_O_ALLOW_RDWR) && |
| 1716 | reopen_state->flags & BDRV_O_RDWR) { |
| 1717 | error_set(errp, QERR_DEVICE_IS_READ_ONLY, |
| 1718 | reopen_state->bs->device_name); |
| 1719 | goto error; |
| 1720 | } |
| 1721 | |
| 1722 | |
| 1723 | ret = bdrv_flush(reopen_state->bs); |
| 1724 | if (ret) { |
| 1725 | error_set(errp, ERROR_CLASS_GENERIC_ERROR, "Error (%s) flushing drive", |
| 1726 | strerror(-ret)); |
| 1727 | goto error; |
| 1728 | } |
| 1729 | |
| 1730 | if (drv->bdrv_reopen_prepare) { |
| 1731 | ret = drv->bdrv_reopen_prepare(reopen_state, queue, &local_err); |
| 1732 | if (ret) { |
| 1733 | if (local_err != NULL) { |
| 1734 | error_propagate(errp, local_err); |
| 1735 | } else { |
Luiz Capitulino | d8b6895 | 2013-06-10 11:29:27 -0400 | [diff] [blame] | 1736 | error_setg(errp, "failed while preparing to reopen image '%s'", |
| 1737 | reopen_state->bs->filename); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 1738 | } |
| 1739 | goto error; |
| 1740 | } |
| 1741 | } else { |
| 1742 | /* It is currently mandatory to have a bdrv_reopen_prepare() |
| 1743 | * handler for each supported drv. */ |
| 1744 | error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED, |
| 1745 | drv->format_name, reopen_state->bs->device_name, |
| 1746 | "reopening of file"); |
| 1747 | ret = -1; |
| 1748 | goto error; |
| 1749 | } |
| 1750 | |
| 1751 | ret = 0; |
| 1752 | |
| 1753 | error: |
| 1754 | return ret; |
| 1755 | } |
| 1756 | |
| 1757 | /* |
| 1758 | * Takes the staged changes for the reopen from bdrv_reopen_prepare(), and |
| 1759 | * makes them final by swapping the staging BlockDriverState contents into |
| 1760 | * the active BlockDriverState contents. |
| 1761 | */ |
| 1762 | void bdrv_reopen_commit(BDRVReopenState *reopen_state) |
| 1763 | { |
| 1764 | BlockDriver *drv; |
| 1765 | |
| 1766 | assert(reopen_state != NULL); |
| 1767 | drv = reopen_state->bs->drv; |
| 1768 | assert(drv != NULL); |
| 1769 | |
| 1770 | /* If there are any driver level actions to take */ |
| 1771 | if (drv->bdrv_reopen_commit) { |
| 1772 | drv->bdrv_reopen_commit(reopen_state); |
| 1773 | } |
| 1774 | |
| 1775 | /* set BDS specific flags now */ |
| 1776 | reopen_state->bs->open_flags = reopen_state->flags; |
| 1777 | reopen_state->bs->enable_write_cache = !!(reopen_state->flags & |
| 1778 | BDRV_O_CACHE_WB); |
| 1779 | reopen_state->bs->read_only = !(reopen_state->flags & BDRV_O_RDWR); |
Kevin Wolf | 355ef4a | 2013-12-11 20:14:09 +0100 | [diff] [blame] | 1780 | |
| 1781 | bdrv_refresh_limits(reopen_state->bs); |
Jeff Cody | e971aa1 | 2012-09-20 15:13:19 -0400 | [diff] [blame] | 1782 | } |
| 1783 | |
| 1784 | /* |
| 1785 | * Abort the reopen, and delete and free the staged changes in |
| 1786 | * reopen_state |
| 1787 | */ |
| 1788 | void bdrv_reopen_abort(BDRVReopenState *reopen_state) |
| 1789 | { |
| 1790 | BlockDriver *drv; |
| 1791 | |
| 1792 | assert(reopen_state != NULL); |
| 1793 | drv = reopen_state->bs->drv; |
| 1794 | assert(drv != NULL); |
| 1795 | |
| 1796 | if (drv->bdrv_reopen_abort) { |
| 1797 | drv->bdrv_reopen_abort(reopen_state); |
| 1798 | } |
| 1799 | } |
| 1800 | |
| 1801 | |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 1802 | void bdrv_close(BlockDriverState *bs) |
| 1803 | { |
Paolo Bonzini | 3cbc002 | 2012-10-19 11:36:48 +0200 | [diff] [blame] | 1804 | if (bs->job) { |
| 1805 | block_job_cancel_sync(bs->job); |
| 1806 | } |
Stefan Hajnoczi | 58fda17 | 2013-07-02 15:36:25 +0200 | [diff] [blame] | 1807 | bdrv_drain_all(); /* complete I/O */ |
| 1808 | bdrv_flush(bs); |
| 1809 | bdrv_drain_all(); /* in case flush left pending I/O */ |
Paolo Bonzini | d7d512f | 2012-08-23 11:20:36 +0200 | [diff] [blame] | 1810 | notifier_list_notify(&bs->close_notifiers, bs); |
Kevin Wolf | 7094f12 | 2012-04-11 11:06:37 +0200 | [diff] [blame] | 1811 | |
Paolo Bonzini | 3cbc002 | 2012-10-19 11:36:48 +0200 | [diff] [blame] | 1812 | if (bs->drv) { |
Stefan Hajnoczi | 557df6a | 2010-04-17 10:49:06 +0100 | [diff] [blame] | 1813 | if (bs->backing_hd) { |
Fam Zheng | 826b6ca | 2014-05-23 21:29:47 +0800 | [diff] [blame] | 1814 | BlockDriverState *backing_hd = bs->backing_hd; |
| 1815 | bdrv_set_backing_hd(bs, NULL); |
| 1816 | bdrv_unref(backing_hd); |
Stefan Hajnoczi | 557df6a | 2010-04-17 10:49:06 +0100 | [diff] [blame] | 1817 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 1818 | bs->drv->bdrv_close(bs); |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 1819 | g_free(bs->opaque); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 1820 | bs->opaque = NULL; |
| 1821 | bs->drv = NULL; |
Stefan Hajnoczi | 53fec9d | 2011-11-28 16:08:47 +0000 | [diff] [blame] | 1822 | bs->copy_on_read = 0; |
Paolo Bonzini | a275fa4 | 2012-05-08 16:51:43 +0200 | [diff] [blame] | 1823 | bs->backing_file[0] = '\0'; |
| 1824 | bs->backing_format[0] = '\0'; |
Paolo Bonzini | 6405875 | 2012-05-08 16:51:49 +0200 | [diff] [blame] | 1825 | bs->total_sectors = 0; |
| 1826 | bs->encrypted = 0; |
| 1827 | bs->valid_key = 0; |
| 1828 | bs->sg = 0; |
| 1829 | bs->growable = 0; |
Asias He | 0d51b4d | 2013-08-22 15:24:14 +0800 | [diff] [blame] | 1830 | bs->zero_beyond_eof = false; |
Kevin Wolf | de9c0ce | 2013-03-15 10:35:02 +0100 | [diff] [blame] | 1831 | QDECREF(bs->options); |
| 1832 | bs->options = NULL; |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 1833 | |
Kevin Wolf | 66f82ce | 2010-04-14 14:17:38 +0200 | [diff] [blame] | 1834 | if (bs->file != NULL) { |
Fam Zheng | 4f6fd34 | 2013-08-23 09:14:47 +0800 | [diff] [blame] | 1835 | bdrv_unref(bs->file); |
Paolo Bonzini | 0ac9377 | 2012-05-08 16:51:44 +0200 | [diff] [blame] | 1836 | bs->file = NULL; |
Kevin Wolf | 66f82ce | 2010-04-14 14:17:38 +0200 | [diff] [blame] | 1837 | } |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 1838 | } |
Zhi Yong Wu | 98f90db | 2011-11-08 13:00:14 +0800 | [diff] [blame] | 1839 | |
Pavel Hrdina | 9ca1115 | 2012-08-09 12:44:48 +0200 | [diff] [blame] | 1840 | bdrv_dev_change_media_cb(bs, false); |
| 1841 | |
Zhi Yong Wu | 98f90db | 2011-11-08 13:00:14 +0800 | [diff] [blame] | 1842 | /*throttling disk I/O limits*/ |
| 1843 | if (bs->io_limits_enabled) { |
| 1844 | bdrv_io_limits_disable(bs); |
| 1845 | } |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 1846 | } |
| 1847 | |
MORITA Kazutaka | 2bc93fe | 2010-05-28 11:44:57 +0900 | [diff] [blame] | 1848 | void bdrv_close_all(void) |
| 1849 | { |
| 1850 | BlockDriverState *bs; |
| 1851 | |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 1852 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
Stefan Hajnoczi | ed78cda | 2014-05-08 16:34:35 +0200 | [diff] [blame] | 1853 | AioContext *aio_context = bdrv_get_aio_context(bs); |
| 1854 | |
| 1855 | aio_context_acquire(aio_context); |
MORITA Kazutaka | 2bc93fe | 2010-05-28 11:44:57 +0900 | [diff] [blame] | 1856 | bdrv_close(bs); |
Stefan Hajnoczi | ed78cda | 2014-05-08 16:34:35 +0200 | [diff] [blame] | 1857 | aio_context_release(aio_context); |
MORITA Kazutaka | 2bc93fe | 2010-05-28 11:44:57 +0900 | [diff] [blame] | 1858 | } |
| 1859 | } |
| 1860 | |
Stefan Hajnoczi | 88266f5 | 2013-04-11 15:41:13 +0200 | [diff] [blame] | 1861 | /* Check if any requests are in-flight (including throttled requests) */ |
| 1862 | static bool bdrv_requests_pending(BlockDriverState *bs) |
| 1863 | { |
| 1864 | if (!QLIST_EMPTY(&bs->tracked_requests)) { |
| 1865 | return true; |
| 1866 | } |
Benoît Canet | cc0681c | 2013-09-02 14:14:39 +0200 | [diff] [blame] | 1867 | if (!qemu_co_queue_empty(&bs->throttled_reqs[0])) { |
| 1868 | return true; |
| 1869 | } |
| 1870 | if (!qemu_co_queue_empty(&bs->throttled_reqs[1])) { |
Stefan Hajnoczi | 88266f5 | 2013-04-11 15:41:13 +0200 | [diff] [blame] | 1871 | return true; |
| 1872 | } |
| 1873 | if (bs->file && bdrv_requests_pending(bs->file)) { |
| 1874 | return true; |
| 1875 | } |
| 1876 | if (bs->backing_hd && bdrv_requests_pending(bs->backing_hd)) { |
| 1877 | return true; |
| 1878 | } |
| 1879 | return false; |
| 1880 | } |
| 1881 | |
Stefan Hajnoczi | 922453b | 2011-11-30 12:23:43 +0000 | [diff] [blame] | 1882 | /* |
| 1883 | * Wait for pending requests to complete across all BlockDriverStates |
| 1884 | * |
| 1885 | * This function does not flush data to disk, use bdrv_flush_all() for that |
| 1886 | * after calling this function. |
Zhi Yong Wu | 4c355d5 | 2012-04-12 14:00:57 +0200 | [diff] [blame] | 1887 | * |
| 1888 | * Note that completion of an asynchronous I/O operation can trigger any |
| 1889 | * number of other I/O operations on other devices---for example a coroutine |
| 1890 | * can be arbitrarily complex and a constant flow of I/O can come until the |
| 1891 | * coroutine is complete. Because of this, it is not possible to have a |
| 1892 | * function to drain a single device's I/O queue. |
Stefan Hajnoczi | 922453b | 2011-11-30 12:23:43 +0000 | [diff] [blame] | 1893 | */ |
| 1894 | void bdrv_drain_all(void) |
| 1895 | { |
Stefan Hajnoczi | 88266f5 | 2013-04-11 15:41:13 +0200 | [diff] [blame] | 1896 | /* Always run first iteration so any pending completion BHs run */ |
| 1897 | bool busy = true; |
Stefan Hajnoczi | 922453b | 2011-11-30 12:23:43 +0000 | [diff] [blame] | 1898 | BlockDriverState *bs; |
| 1899 | |
Stefan Hajnoczi | 88266f5 | 2013-04-11 15:41:13 +0200 | [diff] [blame] | 1900 | while (busy) { |
Stefan Hajnoczi | 9b536ad | 2014-05-08 16:34:36 +0200 | [diff] [blame] | 1901 | busy = false; |
Stefan Hajnoczi | 922453b | 2011-11-30 12:23:43 +0000 | [diff] [blame] | 1902 | |
Stefan Hajnoczi | 9b536ad | 2014-05-08 16:34:36 +0200 | [diff] [blame] | 1903 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
| 1904 | AioContext *aio_context = bdrv_get_aio_context(bs); |
| 1905 | bool bs_busy; |
| 1906 | |
| 1907 | aio_context_acquire(aio_context); |
| 1908 | bdrv_start_throttled_reqs(bs); |
| 1909 | bs_busy = bdrv_requests_pending(bs); |
| 1910 | bs_busy |= aio_poll(aio_context, bs_busy); |
| 1911 | aio_context_release(aio_context); |
| 1912 | |
| 1913 | busy |= bs_busy; |
| 1914 | } |
Stefan Hajnoczi | 922453b | 2011-11-30 12:23:43 +0000 | [diff] [blame] | 1915 | } |
| 1916 | } |
| 1917 | |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 1918 | /* make a BlockDriverState anonymous by removing from bdrv_state and |
| 1919 | * graph_bdrv_state list. |
Ryan Harper | d22b2f4 | 2011-03-29 20:51:47 -0500 | [diff] [blame] | 1920 | Also, NULL terminate the device_name to prevent double remove */ |
| 1921 | void bdrv_make_anon(BlockDriverState *bs) |
| 1922 | { |
| 1923 | if (bs->device_name[0] != '\0') { |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 1924 | QTAILQ_REMOVE(&bdrv_states, bs, device_list); |
Ryan Harper | d22b2f4 | 2011-03-29 20:51:47 -0500 | [diff] [blame] | 1925 | } |
| 1926 | bs->device_name[0] = '\0'; |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 1927 | if (bs->node_name[0] != '\0') { |
| 1928 | QTAILQ_REMOVE(&graph_bdrv_states, bs, node_list); |
| 1929 | } |
| 1930 | bs->node_name[0] = '\0'; |
Ryan Harper | d22b2f4 | 2011-03-29 20:51:47 -0500 | [diff] [blame] | 1931 | } |
| 1932 | |
Paolo Bonzini | e023b2e | 2012-05-08 16:51:41 +0200 | [diff] [blame] | 1933 | static void bdrv_rebind(BlockDriverState *bs) |
| 1934 | { |
| 1935 | if (bs->drv && bs->drv->bdrv_rebind) { |
| 1936 | bs->drv->bdrv_rebind(bs); |
| 1937 | } |
| 1938 | } |
| 1939 | |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 1940 | static void bdrv_move_feature_fields(BlockDriverState *bs_dest, |
| 1941 | BlockDriverState *bs_src) |
| 1942 | { |
| 1943 | /* move some fields that need to stay attached to the device */ |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 1944 | |
| 1945 | /* dev info */ |
| 1946 | bs_dest->dev_ops = bs_src->dev_ops; |
| 1947 | bs_dest->dev_opaque = bs_src->dev_opaque; |
| 1948 | bs_dest->dev = bs_src->dev; |
Paolo Bonzini | 1b7fd72 | 2011-11-29 11:35:47 +0100 | [diff] [blame] | 1949 | bs_dest->guest_block_size = bs_src->guest_block_size; |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 1950 | bs_dest->copy_on_read = bs_src->copy_on_read; |
| 1951 | |
| 1952 | bs_dest->enable_write_cache = bs_src->enable_write_cache; |
| 1953 | |
Benoît Canet | cc0681c | 2013-09-02 14:14:39 +0200 | [diff] [blame] | 1954 | /* i/o throttled req */ |
| 1955 | memcpy(&bs_dest->throttle_state, |
| 1956 | &bs_src->throttle_state, |
| 1957 | sizeof(ThrottleState)); |
| 1958 | bs_dest->throttled_reqs[0] = bs_src->throttled_reqs[0]; |
| 1959 | bs_dest->throttled_reqs[1] = bs_src->throttled_reqs[1]; |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 1960 | bs_dest->io_limits_enabled = bs_src->io_limits_enabled; |
| 1961 | |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 1962 | /* r/w error */ |
| 1963 | bs_dest->on_read_error = bs_src->on_read_error; |
| 1964 | bs_dest->on_write_error = bs_src->on_write_error; |
| 1965 | |
| 1966 | /* i/o status */ |
| 1967 | bs_dest->iostatus_enabled = bs_src->iostatus_enabled; |
| 1968 | bs_dest->iostatus = bs_src->iostatus; |
| 1969 | |
| 1970 | /* dirty bitmap */ |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 1971 | bs_dest->dirty_bitmaps = bs_src->dirty_bitmaps; |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 1972 | |
Fam Zheng | 9fcb025 | 2013-08-23 09:14:46 +0800 | [diff] [blame] | 1973 | /* reference count */ |
| 1974 | bs_dest->refcnt = bs_src->refcnt; |
| 1975 | |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 1976 | /* job */ |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 1977 | bs_dest->job = bs_src->job; |
| 1978 | |
| 1979 | /* keep the same entry in bdrv_states */ |
| 1980 | pstrcpy(bs_dest->device_name, sizeof(bs_dest->device_name), |
| 1981 | bs_src->device_name); |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 1982 | bs_dest->device_list = bs_src->device_list; |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 1983 | memcpy(bs_dest->op_blockers, bs_src->op_blockers, |
| 1984 | sizeof(bs_dest->op_blockers)); |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 1985 | } |
| 1986 | |
| 1987 | /* |
| 1988 | * Swap bs contents for two image chains while they are live, |
| 1989 | * while keeping required fields on the BlockDriverState that is |
| 1990 | * actually attached to a device. |
| 1991 | * |
| 1992 | * This will modify the BlockDriverState fields, and swap contents |
| 1993 | * between bs_new and bs_old. Both bs_new and bs_old are modified. |
| 1994 | * |
| 1995 | * bs_new is required to be anonymous. |
| 1996 | * |
| 1997 | * This function does not create any image files. |
| 1998 | */ |
| 1999 | void bdrv_swap(BlockDriverState *bs_new, BlockDriverState *bs_old) |
| 2000 | { |
| 2001 | BlockDriverState tmp; |
| 2002 | |
Benoît Canet | 90ce8a0 | 2014-03-05 23:48:29 +0100 | [diff] [blame] | 2003 | /* The code needs to swap the node_name but simply swapping node_list won't |
| 2004 | * work so first remove the nodes from the graph list, do the swap then |
| 2005 | * insert them back if needed. |
| 2006 | */ |
| 2007 | if (bs_new->node_name[0] != '\0') { |
| 2008 | QTAILQ_REMOVE(&graph_bdrv_states, bs_new, node_list); |
| 2009 | } |
| 2010 | if (bs_old->node_name[0] != '\0') { |
| 2011 | QTAILQ_REMOVE(&graph_bdrv_states, bs_old, node_list); |
| 2012 | } |
| 2013 | |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 2014 | /* bs_new must be anonymous and shouldn't have anything fancy enabled */ |
| 2015 | assert(bs_new->device_name[0] == '\0'); |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 2016 | assert(QLIST_EMPTY(&bs_new->dirty_bitmaps)); |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 2017 | assert(bs_new->job == NULL); |
| 2018 | assert(bs_new->dev == NULL); |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 2019 | assert(bs_new->io_limits_enabled == false); |
Benoît Canet | cc0681c | 2013-09-02 14:14:39 +0200 | [diff] [blame] | 2020 | assert(!throttle_have_timer(&bs_new->throttle_state)); |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 2021 | |
| 2022 | tmp = *bs_new; |
| 2023 | *bs_new = *bs_old; |
| 2024 | *bs_old = tmp; |
| 2025 | |
| 2026 | /* there are some fields that should not be swapped, move them back */ |
| 2027 | bdrv_move_feature_fields(&tmp, bs_old); |
| 2028 | bdrv_move_feature_fields(bs_old, bs_new); |
| 2029 | bdrv_move_feature_fields(bs_new, &tmp); |
| 2030 | |
| 2031 | /* bs_new shouldn't be in bdrv_states even after the swap! */ |
| 2032 | assert(bs_new->device_name[0] == '\0'); |
| 2033 | |
| 2034 | /* Check a few fields that should remain attached to the device */ |
| 2035 | assert(bs_new->dev == NULL); |
| 2036 | assert(bs_new->job == NULL); |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 2037 | assert(bs_new->io_limits_enabled == false); |
Benoît Canet | cc0681c | 2013-09-02 14:14:39 +0200 | [diff] [blame] | 2038 | assert(!throttle_have_timer(&bs_new->throttle_state)); |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 2039 | |
Benoît Canet | 90ce8a0 | 2014-03-05 23:48:29 +0100 | [diff] [blame] | 2040 | /* insert the nodes back into the graph node list if needed */ |
| 2041 | if (bs_new->node_name[0] != '\0') { |
| 2042 | QTAILQ_INSERT_TAIL(&graph_bdrv_states, bs_new, node_list); |
| 2043 | } |
| 2044 | if (bs_old->node_name[0] != '\0') { |
| 2045 | QTAILQ_INSERT_TAIL(&graph_bdrv_states, bs_old, node_list); |
| 2046 | } |
| 2047 | |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 2048 | bdrv_rebind(bs_new); |
| 2049 | bdrv_rebind(bs_old); |
| 2050 | } |
| 2051 | |
Jeff Cody | 8802d1f | 2012-02-28 15:54:06 -0500 | [diff] [blame] | 2052 | /* |
| 2053 | * Add new bs contents at the top of an image chain while the chain is |
| 2054 | * live, while keeping required fields on the top layer. |
| 2055 | * |
| 2056 | * This will modify the BlockDriverState fields, and swap contents |
| 2057 | * between bs_new and bs_top. Both bs_new and bs_top are modified. |
| 2058 | * |
Jeff Cody | f6801b8 | 2012-03-27 16:30:19 -0400 | [diff] [blame] | 2059 | * bs_new is required to be anonymous. |
| 2060 | * |
Jeff Cody | 8802d1f | 2012-02-28 15:54:06 -0500 | [diff] [blame] | 2061 | * This function does not create any image files. |
| 2062 | */ |
| 2063 | void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top) |
| 2064 | { |
Paolo Bonzini | 4ddc07c | 2012-06-14 16:55:02 +0200 | [diff] [blame] | 2065 | bdrv_swap(bs_new, bs_top); |
Jeff Cody | 8802d1f | 2012-02-28 15:54:06 -0500 | [diff] [blame] | 2066 | |
| 2067 | /* The contents of 'tmp' will become bs_top, as we are |
| 2068 | * swapping bs_new and bs_top contents. */ |
Fam Zheng | 8d24cce | 2014-05-23 21:29:45 +0800 | [diff] [blame] | 2069 | bdrv_set_backing_hd(bs_top, bs_new); |
Jeff Cody | 8802d1f | 2012-02-28 15:54:06 -0500 | [diff] [blame] | 2070 | } |
| 2071 | |
Fam Zheng | 4f6fd34 | 2013-08-23 09:14:47 +0800 | [diff] [blame] | 2072 | static void bdrv_delete(BlockDriverState *bs) |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 2073 | { |
Markus Armbruster | fa879d6 | 2011-08-03 15:07:40 +0200 | [diff] [blame] | 2074 | assert(!bs->dev); |
Paolo Bonzini | 3e91465 | 2012-03-30 13:17:11 +0200 | [diff] [blame] | 2075 | assert(!bs->job); |
Fam Zheng | 3718d8a | 2014-05-23 21:29:43 +0800 | [diff] [blame] | 2076 | assert(bdrv_op_blocker_is_empty(bs)); |
Fam Zheng | 4f6fd34 | 2013-08-23 09:14:47 +0800 | [diff] [blame] | 2077 | assert(!bs->refcnt); |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 2078 | assert(QLIST_EMPTY(&bs->dirty_bitmaps)); |
Markus Armbruster | 18846de | 2010-06-29 16:58:30 +0200 | [diff] [blame] | 2079 | |
Stefan Hajnoczi | e1b5c52 | 2013-06-27 15:32:26 +0200 | [diff] [blame] | 2080 | bdrv_close(bs); |
| 2081 | |
Stefan Hajnoczi | 1b7bdbc | 2010-04-10 07:02:42 +0100 | [diff] [blame] | 2082 | /* remove from list, if necessary */ |
Ryan Harper | d22b2f4 | 2011-03-29 20:51:47 -0500 | [diff] [blame] | 2083 | bdrv_make_anon(bs); |
aurel32 | 34c6f05 | 2008-04-08 19:51:21 +0000 | [diff] [blame] | 2084 | |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 2085 | g_free(bs); |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 2086 | } |
| 2087 | |
Markus Armbruster | fa879d6 | 2011-08-03 15:07:40 +0200 | [diff] [blame] | 2088 | int bdrv_attach_dev(BlockDriverState *bs, void *dev) |
| 2089 | /* TODO change to DeviceState *dev when all users are qdevified */ |
Markus Armbruster | 18846de | 2010-06-29 16:58:30 +0200 | [diff] [blame] | 2090 | { |
Markus Armbruster | fa879d6 | 2011-08-03 15:07:40 +0200 | [diff] [blame] | 2091 | if (bs->dev) { |
Markus Armbruster | 18846de | 2010-06-29 16:58:30 +0200 | [diff] [blame] | 2092 | return -EBUSY; |
| 2093 | } |
Markus Armbruster | fa879d6 | 2011-08-03 15:07:40 +0200 | [diff] [blame] | 2094 | bs->dev = dev; |
Luiz Capitulino | 28a7282 | 2011-09-26 17:43:50 -0300 | [diff] [blame] | 2095 | bdrv_iostatus_reset(bs); |
Markus Armbruster | 18846de | 2010-06-29 16:58:30 +0200 | [diff] [blame] | 2096 | return 0; |
| 2097 | } |
| 2098 | |
Markus Armbruster | fa879d6 | 2011-08-03 15:07:40 +0200 | [diff] [blame] | 2099 | /* TODO qdevified devices don't use this, remove when devices are qdevified */ |
| 2100 | void bdrv_attach_dev_nofail(BlockDriverState *bs, void *dev) |
Markus Armbruster | 18846de | 2010-06-29 16:58:30 +0200 | [diff] [blame] | 2101 | { |
Markus Armbruster | fa879d6 | 2011-08-03 15:07:40 +0200 | [diff] [blame] | 2102 | if (bdrv_attach_dev(bs, dev) < 0) { |
| 2103 | abort(); |
| 2104 | } |
| 2105 | } |
| 2106 | |
| 2107 | void bdrv_detach_dev(BlockDriverState *bs, void *dev) |
| 2108 | /* TODO change to DeviceState *dev when all users are qdevified */ |
| 2109 | { |
| 2110 | assert(bs->dev == dev); |
| 2111 | bs->dev = NULL; |
Markus Armbruster | 0e49de5 | 2011-08-03 15:07:41 +0200 | [diff] [blame] | 2112 | bs->dev_ops = NULL; |
| 2113 | bs->dev_opaque = NULL; |
Paolo Bonzini | 1b7fd72 | 2011-11-29 11:35:47 +0100 | [diff] [blame] | 2114 | bs->guest_block_size = 512; |
Markus Armbruster | 18846de | 2010-06-29 16:58:30 +0200 | [diff] [blame] | 2115 | } |
| 2116 | |
Markus Armbruster | fa879d6 | 2011-08-03 15:07:40 +0200 | [diff] [blame] | 2117 | /* TODO change to return DeviceState * when all users are qdevified */ |
| 2118 | void *bdrv_get_attached_dev(BlockDriverState *bs) |
Markus Armbruster | 18846de | 2010-06-29 16:58:30 +0200 | [diff] [blame] | 2119 | { |
Markus Armbruster | fa879d6 | 2011-08-03 15:07:40 +0200 | [diff] [blame] | 2120 | return bs->dev; |
Markus Armbruster | 18846de | 2010-06-29 16:58:30 +0200 | [diff] [blame] | 2121 | } |
| 2122 | |
Markus Armbruster | 0e49de5 | 2011-08-03 15:07:41 +0200 | [diff] [blame] | 2123 | void bdrv_set_dev_ops(BlockDriverState *bs, const BlockDevOps *ops, |
| 2124 | void *opaque) |
| 2125 | { |
| 2126 | bs->dev_ops = ops; |
| 2127 | bs->dev_opaque = opaque; |
| 2128 | } |
| 2129 | |
Markus Armbruster | 7d4b4ba | 2011-09-06 18:58:59 +0200 | [diff] [blame] | 2130 | static void bdrv_dev_change_media_cb(BlockDriverState *bs, bool load) |
Markus Armbruster | 0e49de5 | 2011-08-03 15:07:41 +0200 | [diff] [blame] | 2131 | { |
Markus Armbruster | 145feb1 | 2011-08-03 15:07:42 +0200 | [diff] [blame] | 2132 | if (bs->dev_ops && bs->dev_ops->change_media_cb) { |
Luiz Capitulino | 6f382ed | 2012-02-14 13:41:13 -0200 | [diff] [blame] | 2133 | bool tray_was_closed = !bdrv_dev_is_tray_open(bs); |
Markus Armbruster | 7d4b4ba | 2011-09-06 18:58:59 +0200 | [diff] [blame] | 2134 | bs->dev_ops->change_media_cb(bs->dev_opaque, load); |
Luiz Capitulino | 6f382ed | 2012-02-14 13:41:13 -0200 | [diff] [blame] | 2135 | if (tray_was_closed) { |
| 2136 | /* tray open */ |
Wenchao Xia | a5ee7bd | 2014-06-18 08:43:44 +0200 | [diff] [blame] | 2137 | qapi_event_send_device_tray_moved(bdrv_get_device_name(bs), |
| 2138 | true, &error_abort); |
Luiz Capitulino | 6f382ed | 2012-02-14 13:41:13 -0200 | [diff] [blame] | 2139 | } |
| 2140 | if (load) { |
| 2141 | /* tray close */ |
Wenchao Xia | a5ee7bd | 2014-06-18 08:43:44 +0200 | [diff] [blame] | 2142 | qapi_event_send_device_tray_moved(bdrv_get_device_name(bs), |
| 2143 | false, &error_abort); |
Luiz Capitulino | 6f382ed | 2012-02-14 13:41:13 -0200 | [diff] [blame] | 2144 | } |
Markus Armbruster | 145feb1 | 2011-08-03 15:07:42 +0200 | [diff] [blame] | 2145 | } |
| 2146 | } |
| 2147 | |
Markus Armbruster | 2c6942f | 2011-09-06 18:58:51 +0200 | [diff] [blame] | 2148 | bool bdrv_dev_has_removable_media(BlockDriverState *bs) |
| 2149 | { |
| 2150 | return !bs->dev || (bs->dev_ops && bs->dev_ops->change_media_cb); |
| 2151 | } |
| 2152 | |
Paolo Bonzini | 025ccaa | 2011-11-07 17:50:13 +0100 | [diff] [blame] | 2153 | void bdrv_dev_eject_request(BlockDriverState *bs, bool force) |
| 2154 | { |
| 2155 | if (bs->dev_ops && bs->dev_ops->eject_request_cb) { |
| 2156 | bs->dev_ops->eject_request_cb(bs->dev_opaque, force); |
| 2157 | } |
| 2158 | } |
| 2159 | |
Markus Armbruster | e4def80 | 2011-09-06 18:58:53 +0200 | [diff] [blame] | 2160 | bool bdrv_dev_is_tray_open(BlockDriverState *bs) |
| 2161 | { |
| 2162 | if (bs->dev_ops && bs->dev_ops->is_tray_open) { |
| 2163 | return bs->dev_ops->is_tray_open(bs->dev_opaque); |
| 2164 | } |
| 2165 | return false; |
| 2166 | } |
| 2167 | |
Markus Armbruster | 145feb1 | 2011-08-03 15:07:42 +0200 | [diff] [blame] | 2168 | static void bdrv_dev_resize_cb(BlockDriverState *bs) |
| 2169 | { |
| 2170 | if (bs->dev_ops && bs->dev_ops->resize_cb) { |
| 2171 | bs->dev_ops->resize_cb(bs->dev_opaque); |
Markus Armbruster | 0e49de5 | 2011-08-03 15:07:41 +0200 | [diff] [blame] | 2172 | } |
| 2173 | } |
| 2174 | |
Markus Armbruster | f107639 | 2011-09-06 18:58:46 +0200 | [diff] [blame] | 2175 | bool bdrv_dev_is_medium_locked(BlockDriverState *bs) |
| 2176 | { |
| 2177 | if (bs->dev_ops && bs->dev_ops->is_medium_locked) { |
| 2178 | return bs->dev_ops->is_medium_locked(bs->dev_opaque); |
| 2179 | } |
| 2180 | return false; |
| 2181 | } |
| 2182 | |
aliguori | e97fc19 | 2009-04-21 23:11:50 +0000 | [diff] [blame] | 2183 | /* |
| 2184 | * Run consistency checks on an image |
| 2185 | * |
Kevin Wolf | e076f33 | 2010-06-29 11:43:13 +0200 | [diff] [blame] | 2186 | * Returns 0 if the check could be completed (it doesn't mean that the image is |
Stefan Weil | a1c7273 | 2011-04-28 17:20:38 +0200 | [diff] [blame] | 2187 | * free of errors) or -errno when an internal error occurred. The results of the |
Kevin Wolf | e076f33 | 2010-06-29 11:43:13 +0200 | [diff] [blame] | 2188 | * check are stored in res. |
aliguori | e97fc19 | 2009-04-21 23:11:50 +0000 | [diff] [blame] | 2189 | */ |
Kevin Wolf | 4534ff5 | 2012-05-11 16:07:02 +0200 | [diff] [blame] | 2190 | int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix) |
aliguori | e97fc19 | 2009-04-21 23:11:50 +0000 | [diff] [blame] | 2191 | { |
| 2192 | if (bs->drv->bdrv_check == NULL) { |
| 2193 | return -ENOTSUP; |
| 2194 | } |
| 2195 | |
Kevin Wolf | e076f33 | 2010-06-29 11:43:13 +0200 | [diff] [blame] | 2196 | memset(res, 0, sizeof(*res)); |
Kevin Wolf | 4534ff5 | 2012-05-11 16:07:02 +0200 | [diff] [blame] | 2197 | return bs->drv->bdrv_check(bs, res, fix); |
aliguori | e97fc19 | 2009-04-21 23:11:50 +0000 | [diff] [blame] | 2198 | } |
| 2199 | |
Kevin Wolf | 8a42661 | 2010-07-16 17:17:01 +0200 | [diff] [blame] | 2200 | #define COMMIT_BUF_SECTORS 2048 |
| 2201 | |
bellard | 33e3963 | 2003-07-06 17:15:21 +0000 | [diff] [blame] | 2202 | /* commit COW file into the raw image */ |
| 2203 | int bdrv_commit(BlockDriverState *bs) |
| 2204 | { |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 2205 | BlockDriver *drv = bs->drv; |
Jeff Cody | 72706ea | 2014-01-24 09:02:35 -0500 | [diff] [blame] | 2206 | int64_t sector, total_sectors, length, backing_length; |
Kevin Wolf | 8a42661 | 2010-07-16 17:17:01 +0200 | [diff] [blame] | 2207 | int n, ro, open_flags; |
Jeff Cody | 0bce597 | 2012-09-20 15:13:34 -0400 | [diff] [blame] | 2208 | int ret = 0; |
Jeff Cody | 72706ea | 2014-01-24 09:02:35 -0500 | [diff] [blame] | 2209 | uint8_t *buf = NULL; |
Jim Meyering | c2cba3d | 2012-10-04 13:09:46 +0200 | [diff] [blame] | 2210 | char filename[PATH_MAX]; |
bellard | 33e3963 | 2003-07-06 17:15:21 +0000 | [diff] [blame] | 2211 | |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 2212 | if (!drv) |
| 2213 | return -ENOMEDIUM; |
Naphtali Sprei | 4dca4b6 | 2010-02-14 13:39:18 +0200 | [diff] [blame] | 2214 | |
| 2215 | if (!bs->backing_hd) { |
| 2216 | return -ENOTSUP; |
bellard | 33e3963 | 2003-07-06 17:15:21 +0000 | [diff] [blame] | 2217 | } |
| 2218 | |
Fam Zheng | 3718d8a | 2014-05-23 21:29:43 +0800 | [diff] [blame] | 2219 | if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT, NULL) || |
| 2220 | bdrv_op_is_blocked(bs->backing_hd, BLOCK_OP_TYPE_COMMIT, NULL)) { |
Stefan Hajnoczi | 2d3735d | 2012-01-18 14:40:41 +0000 | [diff] [blame] | 2221 | return -EBUSY; |
| 2222 | } |
| 2223 | |
Naphtali Sprei | 4dca4b6 | 2010-02-14 13:39:18 +0200 | [diff] [blame] | 2224 | ro = bs->backing_hd->read_only; |
Jim Meyering | c2cba3d | 2012-10-04 13:09:46 +0200 | [diff] [blame] | 2225 | /* Use pstrcpy (not strncpy): filename must be NUL-terminated. */ |
| 2226 | pstrcpy(filename, sizeof(filename), bs->backing_hd->filename); |
Naphtali Sprei | 4dca4b6 | 2010-02-14 13:39:18 +0200 | [diff] [blame] | 2227 | open_flags = bs->backing_hd->open_flags; |
| 2228 | |
| 2229 | if (ro) { |
Jeff Cody | 0bce597 | 2012-09-20 15:13:34 -0400 | [diff] [blame] | 2230 | if (bdrv_reopen(bs->backing_hd, open_flags | BDRV_O_RDWR, NULL)) { |
| 2231 | return -EACCES; |
Naphtali Sprei | 4dca4b6 | 2010-02-14 13:39:18 +0200 | [diff] [blame] | 2232 | } |
bellard | 33e3963 | 2003-07-06 17:15:21 +0000 | [diff] [blame] | 2233 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 2234 | |
Jeff Cody | 72706ea | 2014-01-24 09:02:35 -0500 | [diff] [blame] | 2235 | length = bdrv_getlength(bs); |
| 2236 | if (length < 0) { |
| 2237 | ret = length; |
| 2238 | goto ro_cleanup; |
| 2239 | } |
| 2240 | |
| 2241 | backing_length = bdrv_getlength(bs->backing_hd); |
| 2242 | if (backing_length < 0) { |
| 2243 | ret = backing_length; |
| 2244 | goto ro_cleanup; |
| 2245 | } |
| 2246 | |
| 2247 | /* If our top snapshot is larger than the backing file image, |
| 2248 | * grow the backing file image if possible. If not possible, |
| 2249 | * we must return an error */ |
| 2250 | if (length > backing_length) { |
| 2251 | ret = bdrv_truncate(bs->backing_hd, length); |
| 2252 | if (ret < 0) { |
| 2253 | goto ro_cleanup; |
| 2254 | } |
| 2255 | } |
| 2256 | |
| 2257 | total_sectors = length >> BDRV_SECTOR_BITS; |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 2258 | buf = g_malloc(COMMIT_BUF_SECTORS * BDRV_SECTOR_SIZE); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 2259 | |
Kevin Wolf | 8a42661 | 2010-07-16 17:17:01 +0200 | [diff] [blame] | 2260 | for (sector = 0; sector < total_sectors; sector += n) { |
Paolo Bonzini | d663640 | 2013-09-04 19:00:25 +0200 | [diff] [blame] | 2261 | ret = bdrv_is_allocated(bs, sector, COMMIT_BUF_SECTORS, &n); |
| 2262 | if (ret < 0) { |
| 2263 | goto ro_cleanup; |
| 2264 | } |
| 2265 | if (ret) { |
Kevin Wolf | dabfa6c | 2014-01-24 14:00:43 +0100 | [diff] [blame] | 2266 | ret = bdrv_read(bs, sector, buf, n); |
| 2267 | if (ret < 0) { |
Kevin Wolf | 8a42661 | 2010-07-16 17:17:01 +0200 | [diff] [blame] | 2268 | goto ro_cleanup; |
| 2269 | } |
| 2270 | |
Kevin Wolf | dabfa6c | 2014-01-24 14:00:43 +0100 | [diff] [blame] | 2271 | ret = bdrv_write(bs->backing_hd, sector, buf, n); |
| 2272 | if (ret < 0) { |
Kevin Wolf | 8a42661 | 2010-07-16 17:17:01 +0200 | [diff] [blame] | 2273 | goto ro_cleanup; |
| 2274 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 2275 | } |
| 2276 | } |
bellard | 95389c8 | 2005-12-18 18:28:15 +0000 | [diff] [blame] | 2277 | |
Christoph Hellwig | 1d44952 | 2010-01-17 12:32:30 +0100 | [diff] [blame] | 2278 | if (drv->bdrv_make_empty) { |
| 2279 | ret = drv->bdrv_make_empty(bs); |
Kevin Wolf | dabfa6c | 2014-01-24 14:00:43 +0100 | [diff] [blame] | 2280 | if (ret < 0) { |
| 2281 | goto ro_cleanup; |
| 2282 | } |
Christoph Hellwig | 1d44952 | 2010-01-17 12:32:30 +0100 | [diff] [blame] | 2283 | bdrv_flush(bs); |
| 2284 | } |
bellard | 95389c8 | 2005-12-18 18:28:15 +0000 | [diff] [blame] | 2285 | |
Christoph Hellwig | 3f5075a | 2010-01-12 13:49:23 +0100 | [diff] [blame] | 2286 | /* |
| 2287 | * Make sure all data we wrote to the backing device is actually |
| 2288 | * stable on disk. |
| 2289 | */ |
Kevin Wolf | dabfa6c | 2014-01-24 14:00:43 +0100 | [diff] [blame] | 2290 | if (bs->backing_hd) { |
Christoph Hellwig | 3f5075a | 2010-01-12 13:49:23 +0100 | [diff] [blame] | 2291 | bdrv_flush(bs->backing_hd); |
Kevin Wolf | dabfa6c | 2014-01-24 14:00:43 +0100 | [diff] [blame] | 2292 | } |
Naphtali Sprei | 4dca4b6 | 2010-02-14 13:39:18 +0200 | [diff] [blame] | 2293 | |
Kevin Wolf | dabfa6c | 2014-01-24 14:00:43 +0100 | [diff] [blame] | 2294 | ret = 0; |
Naphtali Sprei | 4dca4b6 | 2010-02-14 13:39:18 +0200 | [diff] [blame] | 2295 | ro_cleanup: |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 2296 | g_free(buf); |
Naphtali Sprei | 4dca4b6 | 2010-02-14 13:39:18 +0200 | [diff] [blame] | 2297 | |
| 2298 | if (ro) { |
Jeff Cody | 0bce597 | 2012-09-20 15:13:34 -0400 | [diff] [blame] | 2299 | /* ignoring error return here */ |
| 2300 | bdrv_reopen(bs->backing_hd, open_flags & ~BDRV_O_RDWR, NULL); |
Naphtali Sprei | 4dca4b6 | 2010-02-14 13:39:18 +0200 | [diff] [blame] | 2301 | } |
| 2302 | |
Christoph Hellwig | 1d44952 | 2010-01-17 12:32:30 +0100 | [diff] [blame] | 2303 | return ret; |
bellard | 33e3963 | 2003-07-06 17:15:21 +0000 | [diff] [blame] | 2304 | } |
| 2305 | |
Stefan Hajnoczi | e887749 | 2012-03-05 18:10:11 +0000 | [diff] [blame] | 2306 | int bdrv_commit_all(void) |
Markus Armbruster | 6ab4b5a | 2010-06-02 18:55:18 +0200 | [diff] [blame] | 2307 | { |
| 2308 | BlockDriverState *bs; |
| 2309 | |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 2310 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
Stefan Hajnoczi | ed78cda | 2014-05-08 16:34:35 +0200 | [diff] [blame] | 2311 | AioContext *aio_context = bdrv_get_aio_context(bs); |
| 2312 | |
| 2313 | aio_context_acquire(aio_context); |
Jeff Cody | 272d2d8 | 2013-02-26 09:55:48 -0500 | [diff] [blame] | 2314 | if (bs->drv && bs->backing_hd) { |
| 2315 | int ret = bdrv_commit(bs); |
| 2316 | if (ret < 0) { |
Stefan Hajnoczi | ed78cda | 2014-05-08 16:34:35 +0200 | [diff] [blame] | 2317 | aio_context_release(aio_context); |
Jeff Cody | 272d2d8 | 2013-02-26 09:55:48 -0500 | [diff] [blame] | 2318 | return ret; |
| 2319 | } |
Stefan Hajnoczi | e887749 | 2012-03-05 18:10:11 +0000 | [diff] [blame] | 2320 | } |
Stefan Hajnoczi | ed78cda | 2014-05-08 16:34:35 +0200 | [diff] [blame] | 2321 | aio_context_release(aio_context); |
Markus Armbruster | 6ab4b5a | 2010-06-02 18:55:18 +0200 | [diff] [blame] | 2322 | } |
Stefan Hajnoczi | e887749 | 2012-03-05 18:10:11 +0000 | [diff] [blame] | 2323 | return 0; |
Markus Armbruster | 6ab4b5a | 2010-06-02 18:55:18 +0200 | [diff] [blame] | 2324 | } |
| 2325 | |
Stefan Hajnoczi | dbffbdc | 2011-11-17 13:40:27 +0000 | [diff] [blame] | 2326 | /** |
| 2327 | * Remove an active request from the tracked requests list |
| 2328 | * |
| 2329 | * This function should be called when a tracked request is completing. |
| 2330 | */ |
| 2331 | static void tracked_request_end(BdrvTrackedRequest *req) |
| 2332 | { |
Kevin Wolf | 2dbafdc | 2013-12-04 16:43:44 +0100 | [diff] [blame] | 2333 | if (req->serialising) { |
| 2334 | req->bs->serialising_in_flight--; |
| 2335 | } |
| 2336 | |
Stefan Hajnoczi | dbffbdc | 2011-11-17 13:40:27 +0000 | [diff] [blame] | 2337 | QLIST_REMOVE(req, list); |
Stefan Hajnoczi | f465828 | 2011-11-17 13:40:29 +0000 | [diff] [blame] | 2338 | qemu_co_queue_restart_all(&req->wait_queue); |
Stefan Hajnoczi | dbffbdc | 2011-11-17 13:40:27 +0000 | [diff] [blame] | 2339 | } |
| 2340 | |
| 2341 | /** |
| 2342 | * Add an active request to the tracked requests list |
| 2343 | */ |
| 2344 | static void tracked_request_begin(BdrvTrackedRequest *req, |
| 2345 | BlockDriverState *bs, |
Kevin Wolf | 793ed47 | 2013-12-03 15:31:25 +0100 | [diff] [blame] | 2346 | int64_t offset, |
| 2347 | unsigned int bytes, bool is_write) |
Stefan Hajnoczi | dbffbdc | 2011-11-17 13:40:27 +0000 | [diff] [blame] | 2348 | { |
| 2349 | *req = (BdrvTrackedRequest){ |
| 2350 | .bs = bs, |
Kevin Wolf | 2dbafdc | 2013-12-04 16:43:44 +0100 | [diff] [blame] | 2351 | .offset = offset, |
| 2352 | .bytes = bytes, |
| 2353 | .is_write = is_write, |
| 2354 | .co = qemu_coroutine_self(), |
| 2355 | .serialising = false, |
Kevin Wolf | 7327145 | 2013-12-04 17:08:50 +0100 | [diff] [blame] | 2356 | .overlap_offset = offset, |
| 2357 | .overlap_bytes = bytes, |
Stefan Hajnoczi | dbffbdc | 2011-11-17 13:40:27 +0000 | [diff] [blame] | 2358 | }; |
| 2359 | |
Stefan Hajnoczi | f465828 | 2011-11-17 13:40:29 +0000 | [diff] [blame] | 2360 | qemu_co_queue_init(&req->wait_queue); |
| 2361 | |
Stefan Hajnoczi | dbffbdc | 2011-11-17 13:40:27 +0000 | [diff] [blame] | 2362 | QLIST_INSERT_HEAD(&bs->tracked_requests, req, list); |
| 2363 | } |
| 2364 | |
Kevin Wolf | e96126f | 2014-02-08 10:42:18 +0100 | [diff] [blame] | 2365 | static void mark_request_serialising(BdrvTrackedRequest *req, uint64_t align) |
Kevin Wolf | 2dbafdc | 2013-12-04 16:43:44 +0100 | [diff] [blame] | 2366 | { |
Kevin Wolf | 7327145 | 2013-12-04 17:08:50 +0100 | [diff] [blame] | 2367 | int64_t overlap_offset = req->offset & ~(align - 1); |
Kevin Wolf | e96126f | 2014-02-08 10:42:18 +0100 | [diff] [blame] | 2368 | unsigned int overlap_bytes = ROUND_UP(req->offset + req->bytes, align) |
| 2369 | - overlap_offset; |
Kevin Wolf | 7327145 | 2013-12-04 17:08:50 +0100 | [diff] [blame] | 2370 | |
Kevin Wolf | 2dbafdc | 2013-12-04 16:43:44 +0100 | [diff] [blame] | 2371 | if (!req->serialising) { |
| 2372 | req->bs->serialising_in_flight++; |
| 2373 | req->serialising = true; |
| 2374 | } |
Kevin Wolf | 7327145 | 2013-12-04 17:08:50 +0100 | [diff] [blame] | 2375 | |
| 2376 | req->overlap_offset = MIN(req->overlap_offset, overlap_offset); |
| 2377 | req->overlap_bytes = MAX(req->overlap_bytes, overlap_bytes); |
Kevin Wolf | 2dbafdc | 2013-12-04 16:43:44 +0100 | [diff] [blame] | 2378 | } |
| 2379 | |
Stefan Hajnoczi | d83947a | 2011-11-23 11:47:56 +0000 | [diff] [blame] | 2380 | /** |
| 2381 | * Round a region to cluster boundaries |
| 2382 | */ |
Paolo Bonzini | 343bded | 2013-01-21 17:09:42 +0100 | [diff] [blame] | 2383 | void bdrv_round_to_clusters(BlockDriverState *bs, |
| 2384 | int64_t sector_num, int nb_sectors, |
| 2385 | int64_t *cluster_sector_num, |
| 2386 | int *cluster_nb_sectors) |
Stefan Hajnoczi | d83947a | 2011-11-23 11:47:56 +0000 | [diff] [blame] | 2387 | { |
| 2388 | BlockDriverInfo bdi; |
| 2389 | |
| 2390 | if (bdrv_get_info(bs, &bdi) < 0 || bdi.cluster_size == 0) { |
| 2391 | *cluster_sector_num = sector_num; |
| 2392 | *cluster_nb_sectors = nb_sectors; |
| 2393 | } else { |
| 2394 | int64_t c = bdi.cluster_size / BDRV_SECTOR_SIZE; |
| 2395 | *cluster_sector_num = QEMU_ALIGN_DOWN(sector_num, c); |
| 2396 | *cluster_nb_sectors = QEMU_ALIGN_UP(sector_num - *cluster_sector_num + |
| 2397 | nb_sectors, c); |
| 2398 | } |
| 2399 | } |
| 2400 | |
Kevin Wolf | 7327145 | 2013-12-04 17:08:50 +0100 | [diff] [blame] | 2401 | static int bdrv_get_cluster_size(BlockDriverState *bs) |
Kevin Wolf | 793ed47 | 2013-12-03 15:31:25 +0100 | [diff] [blame] | 2402 | { |
| 2403 | BlockDriverInfo bdi; |
Kevin Wolf | 7327145 | 2013-12-04 17:08:50 +0100 | [diff] [blame] | 2404 | int ret; |
Kevin Wolf | 793ed47 | 2013-12-03 15:31:25 +0100 | [diff] [blame] | 2405 | |
Kevin Wolf | 7327145 | 2013-12-04 17:08:50 +0100 | [diff] [blame] | 2406 | ret = bdrv_get_info(bs, &bdi); |
| 2407 | if (ret < 0 || bdi.cluster_size == 0) { |
| 2408 | return bs->request_alignment; |
Kevin Wolf | 793ed47 | 2013-12-03 15:31:25 +0100 | [diff] [blame] | 2409 | } else { |
Kevin Wolf | 7327145 | 2013-12-04 17:08:50 +0100 | [diff] [blame] | 2410 | return bdi.cluster_size; |
Kevin Wolf | 793ed47 | 2013-12-03 15:31:25 +0100 | [diff] [blame] | 2411 | } |
| 2412 | } |
| 2413 | |
Stefan Hajnoczi | f465828 | 2011-11-17 13:40:29 +0000 | [diff] [blame] | 2414 | static bool tracked_request_overlaps(BdrvTrackedRequest *req, |
Kevin Wolf | 793ed47 | 2013-12-03 15:31:25 +0100 | [diff] [blame] | 2415 | int64_t offset, unsigned int bytes) |
| 2416 | { |
Stefan Hajnoczi | d83947a | 2011-11-23 11:47:56 +0000 | [diff] [blame] | 2417 | /* aaaa bbbb */ |
Kevin Wolf | 7327145 | 2013-12-04 17:08:50 +0100 | [diff] [blame] | 2418 | if (offset >= req->overlap_offset + req->overlap_bytes) { |
Stefan Hajnoczi | d83947a | 2011-11-23 11:47:56 +0000 | [diff] [blame] | 2419 | return false; |
| 2420 | } |
| 2421 | /* bbbb aaaa */ |
Kevin Wolf | 7327145 | 2013-12-04 17:08:50 +0100 | [diff] [blame] | 2422 | if (req->overlap_offset >= offset + bytes) { |
Stefan Hajnoczi | d83947a | 2011-11-23 11:47:56 +0000 | [diff] [blame] | 2423 | return false; |
| 2424 | } |
| 2425 | return true; |
Stefan Hajnoczi | f465828 | 2011-11-17 13:40:29 +0000 | [diff] [blame] | 2426 | } |
| 2427 | |
Kevin Wolf | 28de2dc | 2014-01-14 11:41:35 +0100 | [diff] [blame] | 2428 | static bool coroutine_fn wait_serialising_requests(BdrvTrackedRequest *self) |
Stefan Hajnoczi | f465828 | 2011-11-17 13:40:29 +0000 | [diff] [blame] | 2429 | { |
Kevin Wolf | 2dbafdc | 2013-12-04 16:43:44 +0100 | [diff] [blame] | 2430 | BlockDriverState *bs = self->bs; |
Stefan Hajnoczi | f465828 | 2011-11-17 13:40:29 +0000 | [diff] [blame] | 2431 | BdrvTrackedRequest *req; |
| 2432 | bool retry; |
Kevin Wolf | 28de2dc | 2014-01-14 11:41:35 +0100 | [diff] [blame] | 2433 | bool waited = false; |
Stefan Hajnoczi | f465828 | 2011-11-17 13:40:29 +0000 | [diff] [blame] | 2434 | |
Kevin Wolf | 2dbafdc | 2013-12-04 16:43:44 +0100 | [diff] [blame] | 2435 | if (!bs->serialising_in_flight) { |
Kevin Wolf | 28de2dc | 2014-01-14 11:41:35 +0100 | [diff] [blame] | 2436 | return false; |
Kevin Wolf | 2dbafdc | 2013-12-04 16:43:44 +0100 | [diff] [blame] | 2437 | } |
| 2438 | |
Stefan Hajnoczi | f465828 | 2011-11-17 13:40:29 +0000 | [diff] [blame] | 2439 | do { |
| 2440 | retry = false; |
| 2441 | QLIST_FOREACH(req, &bs->tracked_requests, list) { |
Kevin Wolf | 2dbafdc | 2013-12-04 16:43:44 +0100 | [diff] [blame] | 2442 | if (req == self || (!req->serialising && !self->serialising)) { |
Kevin Wolf | 65afd21 | 2013-12-03 14:55:55 +0100 | [diff] [blame] | 2443 | continue; |
| 2444 | } |
Kevin Wolf | 7327145 | 2013-12-04 17:08:50 +0100 | [diff] [blame] | 2445 | if (tracked_request_overlaps(req, self->overlap_offset, |
| 2446 | self->overlap_bytes)) |
| 2447 | { |
Stefan Hajnoczi | 5f8b649 | 2011-11-30 12:23:42 +0000 | [diff] [blame] | 2448 | /* Hitting this means there was a reentrant request, for |
| 2449 | * example, a block driver issuing nested requests. This must |
| 2450 | * never happen since it means deadlock. |
| 2451 | */ |
| 2452 | assert(qemu_coroutine_self() != req->co); |
| 2453 | |
Kevin Wolf | 6460440 | 2013-12-13 13:04:35 +0100 | [diff] [blame] | 2454 | /* If the request is already (indirectly) waiting for us, or |
| 2455 | * will wait for us as soon as it wakes up, then just go on |
| 2456 | * (instead of producing a deadlock in the former case). */ |
| 2457 | if (!req->waiting_for) { |
| 2458 | self->waiting_for = req; |
| 2459 | qemu_co_queue_wait(&req->wait_queue); |
| 2460 | self->waiting_for = NULL; |
| 2461 | retry = true; |
Kevin Wolf | 28de2dc | 2014-01-14 11:41:35 +0100 | [diff] [blame] | 2462 | waited = true; |
Kevin Wolf | 6460440 | 2013-12-13 13:04:35 +0100 | [diff] [blame] | 2463 | break; |
| 2464 | } |
Stefan Hajnoczi | f465828 | 2011-11-17 13:40:29 +0000 | [diff] [blame] | 2465 | } |
| 2466 | } |
| 2467 | } while (retry); |
Kevin Wolf | 28de2dc | 2014-01-14 11:41:35 +0100 | [diff] [blame] | 2468 | |
| 2469 | return waited; |
Stefan Hajnoczi | f465828 | 2011-11-17 13:40:29 +0000 | [diff] [blame] | 2470 | } |
| 2471 | |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 2472 | /* |
| 2473 | * Return values: |
| 2474 | * 0 - success |
| 2475 | * -EINVAL - backing format specified, but no file |
| 2476 | * -ENOSPC - can't update the backing file because no space is left in the |
| 2477 | * image file header |
| 2478 | * -ENOTSUP - format driver doesn't support changing the backing file |
| 2479 | */ |
| 2480 | int bdrv_change_backing_file(BlockDriverState *bs, |
| 2481 | const char *backing_file, const char *backing_fmt) |
| 2482 | { |
| 2483 | BlockDriver *drv = bs->drv; |
Paolo Bonzini | 469ef35 | 2012-04-12 14:01:02 +0200 | [diff] [blame] | 2484 | int ret; |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 2485 | |
Paolo Bonzini | 5f37779 | 2012-04-12 14:01:01 +0200 | [diff] [blame] | 2486 | /* Backing file format doesn't make sense without a backing file */ |
| 2487 | if (backing_fmt && !backing_file) { |
| 2488 | return -EINVAL; |
| 2489 | } |
| 2490 | |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 2491 | if (drv->bdrv_change_backing_file != NULL) { |
Paolo Bonzini | 469ef35 | 2012-04-12 14:01:02 +0200 | [diff] [blame] | 2492 | ret = drv->bdrv_change_backing_file(bs, backing_file, backing_fmt); |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 2493 | } else { |
Paolo Bonzini | 469ef35 | 2012-04-12 14:01:02 +0200 | [diff] [blame] | 2494 | ret = -ENOTSUP; |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 2495 | } |
Paolo Bonzini | 469ef35 | 2012-04-12 14:01:02 +0200 | [diff] [blame] | 2496 | |
| 2497 | if (ret == 0) { |
| 2498 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: ""); |
| 2499 | pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: ""); |
| 2500 | } |
| 2501 | return ret; |
Kevin Wolf | 756e673 | 2010-01-12 12:55:17 +0100 | [diff] [blame] | 2502 | } |
| 2503 | |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 2504 | /* |
| 2505 | * Finds the image layer in the chain that has 'bs' as its backing file. |
| 2506 | * |
| 2507 | * active is the current topmost image. |
| 2508 | * |
| 2509 | * Returns NULL if bs is not found in active's image chain, |
| 2510 | * or if active == bs. |
| 2511 | */ |
| 2512 | BlockDriverState *bdrv_find_overlay(BlockDriverState *active, |
| 2513 | BlockDriverState *bs) |
| 2514 | { |
| 2515 | BlockDriverState *overlay = NULL; |
| 2516 | BlockDriverState *intermediate; |
| 2517 | |
| 2518 | assert(active != NULL); |
| 2519 | assert(bs != NULL); |
| 2520 | |
| 2521 | /* if bs is the same as active, then by definition it has no overlay |
| 2522 | */ |
| 2523 | if (active == bs) { |
| 2524 | return NULL; |
| 2525 | } |
| 2526 | |
| 2527 | intermediate = active; |
| 2528 | while (intermediate->backing_hd) { |
| 2529 | if (intermediate->backing_hd == bs) { |
| 2530 | overlay = intermediate; |
| 2531 | break; |
| 2532 | } |
| 2533 | intermediate = intermediate->backing_hd; |
| 2534 | } |
| 2535 | |
| 2536 | return overlay; |
| 2537 | } |
| 2538 | |
| 2539 | typedef struct BlkIntermediateStates { |
| 2540 | BlockDriverState *bs; |
| 2541 | QSIMPLEQ_ENTRY(BlkIntermediateStates) entry; |
| 2542 | } BlkIntermediateStates; |
| 2543 | |
| 2544 | |
| 2545 | /* |
| 2546 | * Drops images above 'base' up to and including 'top', and sets the image |
| 2547 | * above 'top' to have base as its backing file. |
| 2548 | * |
| 2549 | * Requires that the overlay to 'top' is opened r/w, so that the backing file |
| 2550 | * information in 'bs' can be properly updated. |
| 2551 | * |
| 2552 | * E.g., this will convert the following chain: |
| 2553 | * bottom <- base <- intermediate <- top <- active |
| 2554 | * |
| 2555 | * to |
| 2556 | * |
| 2557 | * bottom <- base <- active |
| 2558 | * |
| 2559 | * It is allowed for bottom==base, in which case it converts: |
| 2560 | * |
| 2561 | * base <- intermediate <- top <- active |
| 2562 | * |
| 2563 | * to |
| 2564 | * |
| 2565 | * base <- active |
| 2566 | * |
| 2567 | * Error conditions: |
| 2568 | * if active == top, that is considered an error |
| 2569 | * |
| 2570 | */ |
| 2571 | int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top, |
| 2572 | BlockDriverState *base) |
| 2573 | { |
| 2574 | BlockDriverState *intermediate; |
| 2575 | BlockDriverState *base_bs = NULL; |
| 2576 | BlockDriverState *new_top_bs = NULL; |
| 2577 | BlkIntermediateStates *intermediate_state, *next; |
| 2578 | int ret = -EIO; |
| 2579 | |
| 2580 | QSIMPLEQ_HEAD(states_to_delete, BlkIntermediateStates) states_to_delete; |
| 2581 | QSIMPLEQ_INIT(&states_to_delete); |
| 2582 | |
| 2583 | if (!top->drv || !base->drv) { |
| 2584 | goto exit; |
| 2585 | } |
| 2586 | |
| 2587 | new_top_bs = bdrv_find_overlay(active, top); |
| 2588 | |
| 2589 | if (new_top_bs == NULL) { |
| 2590 | /* we could not find the image above 'top', this is an error */ |
| 2591 | goto exit; |
| 2592 | } |
| 2593 | |
| 2594 | /* special case of new_top_bs->backing_hd already pointing to base - nothing |
| 2595 | * to do, no intermediate images */ |
| 2596 | if (new_top_bs->backing_hd == base) { |
| 2597 | ret = 0; |
| 2598 | goto exit; |
| 2599 | } |
| 2600 | |
| 2601 | intermediate = top; |
| 2602 | |
| 2603 | /* now we will go down through the list, and add each BDS we find |
| 2604 | * into our deletion queue, until we hit the 'base' |
| 2605 | */ |
| 2606 | while (intermediate) { |
| 2607 | intermediate_state = g_malloc0(sizeof(BlkIntermediateStates)); |
| 2608 | intermediate_state->bs = intermediate; |
| 2609 | QSIMPLEQ_INSERT_TAIL(&states_to_delete, intermediate_state, entry); |
| 2610 | |
| 2611 | if (intermediate->backing_hd == base) { |
| 2612 | base_bs = intermediate->backing_hd; |
| 2613 | break; |
| 2614 | } |
| 2615 | intermediate = intermediate->backing_hd; |
| 2616 | } |
| 2617 | if (base_bs == NULL) { |
| 2618 | /* something went wrong, we did not end at the base. safely |
| 2619 | * unravel everything, and exit with error */ |
| 2620 | goto exit; |
| 2621 | } |
| 2622 | |
| 2623 | /* success - we can delete the intermediate states, and link top->base */ |
| 2624 | ret = bdrv_change_backing_file(new_top_bs, base_bs->filename, |
| 2625 | base_bs->drv ? base_bs->drv->format_name : ""); |
| 2626 | if (ret) { |
| 2627 | goto exit; |
| 2628 | } |
Fam Zheng | 920beae | 2014-05-23 21:29:46 +0800 | [diff] [blame] | 2629 | bdrv_set_backing_hd(new_top_bs, base_bs); |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 2630 | |
| 2631 | QSIMPLEQ_FOREACH_SAFE(intermediate_state, &states_to_delete, entry, next) { |
| 2632 | /* so that bdrv_close() does not recursively close the chain */ |
Fam Zheng | 920beae | 2014-05-23 21:29:46 +0800 | [diff] [blame] | 2633 | bdrv_set_backing_hd(intermediate_state->bs, NULL); |
Fam Zheng | 4f6fd34 | 2013-08-23 09:14:47 +0800 | [diff] [blame] | 2634 | bdrv_unref(intermediate_state->bs); |
Jeff Cody | 6ebdcee | 2012-09-27 13:29:12 -0400 | [diff] [blame] | 2635 | } |
| 2636 | ret = 0; |
| 2637 | |
| 2638 | exit: |
| 2639 | QSIMPLEQ_FOREACH_SAFE(intermediate_state, &states_to_delete, entry, next) { |
| 2640 | g_free(intermediate_state); |
| 2641 | } |
| 2642 | return ret; |
| 2643 | } |
| 2644 | |
| 2645 | |
aliguori | 71d0770 | 2009-03-03 17:37:16 +0000 | [diff] [blame] | 2646 | static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
| 2647 | size_t size) |
| 2648 | { |
| 2649 | int64_t len; |
| 2650 | |
Kevin Wolf | 1dd3a44 | 2014-04-14 14:48:16 +0200 | [diff] [blame] | 2651 | if (size > INT_MAX) { |
| 2652 | return -EIO; |
| 2653 | } |
| 2654 | |
aliguori | 71d0770 | 2009-03-03 17:37:16 +0000 | [diff] [blame] | 2655 | if (!bdrv_is_inserted(bs)) |
| 2656 | return -ENOMEDIUM; |
| 2657 | |
| 2658 | if (bs->growable) |
| 2659 | return 0; |
| 2660 | |
| 2661 | len = bdrv_getlength(bs); |
| 2662 | |
Kevin Wolf | fbb7b4e | 2009-05-08 14:47:24 +0200 | [diff] [blame] | 2663 | if (offset < 0) |
| 2664 | return -EIO; |
| 2665 | |
| 2666 | if ((offset > len) || (len - offset < size)) |
aliguori | 71d0770 | 2009-03-03 17:37:16 +0000 | [diff] [blame] | 2667 | return -EIO; |
| 2668 | |
| 2669 | return 0; |
| 2670 | } |
| 2671 | |
| 2672 | static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, |
| 2673 | int nb_sectors) |
| 2674 | { |
Kevin Wolf | 54db38a | 2014-04-14 14:47:14 +0200 | [diff] [blame] | 2675 | if (nb_sectors < 0 || nb_sectors > INT_MAX / BDRV_SECTOR_SIZE) { |
Kevin Wolf | 8f4754e | 2014-03-26 13:06:02 +0100 | [diff] [blame] | 2676 | return -EIO; |
| 2677 | } |
| 2678 | |
Jes Sorensen | eb5a316 | 2010-05-27 16:20:31 +0200 | [diff] [blame] | 2679 | return bdrv_check_byte_request(bs, sector_num * BDRV_SECTOR_SIZE, |
| 2680 | nb_sectors * BDRV_SECTOR_SIZE); |
aliguori | 71d0770 | 2009-03-03 17:37:16 +0000 | [diff] [blame] | 2681 | } |
| 2682 | |
Stefan Hajnoczi | 1c9805a | 2011-10-13 13:08:22 +0100 | [diff] [blame] | 2683 | typedef struct RwCo { |
| 2684 | BlockDriverState *bs; |
Kevin Wolf | 775aa8b | 2013-12-05 12:09:38 +0100 | [diff] [blame] | 2685 | int64_t offset; |
Stefan Hajnoczi | 1c9805a | 2011-10-13 13:08:22 +0100 | [diff] [blame] | 2686 | QEMUIOVector *qiov; |
| 2687 | bool is_write; |
| 2688 | int ret; |
Peter Lieven | 4105eaa | 2013-07-11 14:16:22 +0200 | [diff] [blame] | 2689 | BdrvRequestFlags flags; |
Stefan Hajnoczi | 1c9805a | 2011-10-13 13:08:22 +0100 | [diff] [blame] | 2690 | } RwCo; |
| 2691 | |
| 2692 | static void coroutine_fn bdrv_rw_co_entry(void *opaque) |
| 2693 | { |
| 2694 | RwCo *rwco = opaque; |
| 2695 | |
| 2696 | if (!rwco->is_write) { |
Kevin Wolf | 775aa8b | 2013-12-05 12:09:38 +0100 | [diff] [blame] | 2697 | rwco->ret = bdrv_co_do_preadv(rwco->bs, rwco->offset, |
| 2698 | rwco->qiov->size, rwco->qiov, |
Peter Lieven | 4105eaa | 2013-07-11 14:16:22 +0200 | [diff] [blame] | 2699 | rwco->flags); |
Kevin Wolf | 775aa8b | 2013-12-05 12:09:38 +0100 | [diff] [blame] | 2700 | } else { |
| 2701 | rwco->ret = bdrv_co_do_pwritev(rwco->bs, rwco->offset, |
| 2702 | rwco->qiov->size, rwco->qiov, |
| 2703 | rwco->flags); |
Stefan Hajnoczi | 1c9805a | 2011-10-13 13:08:22 +0100 | [diff] [blame] | 2704 | } |
| 2705 | } |
| 2706 | |
| 2707 | /* |
Kevin Wolf | 8d3b1a2 | 2013-04-05 21:27:55 +0200 | [diff] [blame] | 2708 | * Process a vectored synchronous request using coroutines |
Stefan Hajnoczi | 1c9805a | 2011-10-13 13:08:22 +0100 | [diff] [blame] | 2709 | */ |
Kevin Wolf | 775aa8b | 2013-12-05 12:09:38 +0100 | [diff] [blame] | 2710 | static int bdrv_prwv_co(BlockDriverState *bs, int64_t offset, |
| 2711 | QEMUIOVector *qiov, bool is_write, |
| 2712 | BdrvRequestFlags flags) |
Stefan Hajnoczi | 1c9805a | 2011-10-13 13:08:22 +0100 | [diff] [blame] | 2713 | { |
Stefan Hajnoczi | 1c9805a | 2011-10-13 13:08:22 +0100 | [diff] [blame] | 2714 | Coroutine *co; |
| 2715 | RwCo rwco = { |
| 2716 | .bs = bs, |
Kevin Wolf | 775aa8b | 2013-12-05 12:09:38 +0100 | [diff] [blame] | 2717 | .offset = offset, |
Kevin Wolf | 8d3b1a2 | 2013-04-05 21:27:55 +0200 | [diff] [blame] | 2718 | .qiov = qiov, |
Stefan Hajnoczi | 1c9805a | 2011-10-13 13:08:22 +0100 | [diff] [blame] | 2719 | .is_write = is_write, |
| 2720 | .ret = NOT_DONE, |
Peter Lieven | 4105eaa | 2013-07-11 14:16:22 +0200 | [diff] [blame] | 2721 | .flags = flags, |
Stefan Hajnoczi | 1c9805a | 2011-10-13 13:08:22 +0100 | [diff] [blame] | 2722 | }; |
Stefan Hajnoczi | 1c9805a | 2011-10-13 13:08:22 +0100 | [diff] [blame] | 2723 | |
Zhi Yong Wu | 498e386 | 2012-04-02 18:59:34 +0800 | [diff] [blame] | 2724 | /** |
| 2725 | * In sync call context, when the vcpu is blocked, this throttling timer |
| 2726 | * will not fire; so the I/O throttling function has to be disabled here |
| 2727 | * if it has been enabled. |
| 2728 | */ |
| 2729 | if (bs->io_limits_enabled) { |
| 2730 | fprintf(stderr, "Disabling I/O throttling on '%s' due " |
| 2731 | "to synchronous I/O.\n", bdrv_get_device_name(bs)); |
| 2732 | bdrv_io_limits_disable(bs); |
| 2733 | } |
| 2734 | |
Stefan Hajnoczi | 1c9805a | 2011-10-13 13:08:22 +0100 | [diff] [blame] | 2735 | if (qemu_in_coroutine()) { |
| 2736 | /* Fast-path if already in coroutine context */ |
| 2737 | bdrv_rw_co_entry(&rwco); |
| 2738 | } else { |
Stefan Hajnoczi | 2572b37 | 2014-05-08 16:34:34 +0200 | [diff] [blame] | 2739 | AioContext *aio_context = bdrv_get_aio_context(bs); |
| 2740 | |
Stefan Hajnoczi | 1c9805a | 2011-10-13 13:08:22 +0100 | [diff] [blame] | 2741 | co = qemu_coroutine_create(bdrv_rw_co_entry); |
| 2742 | qemu_coroutine_enter(co, &rwco); |
| 2743 | while (rwco.ret == NOT_DONE) { |
Stefan Hajnoczi | 2572b37 | 2014-05-08 16:34:34 +0200 | [diff] [blame] | 2744 | aio_poll(aio_context, true); |
Stefan Hajnoczi | 1c9805a | 2011-10-13 13:08:22 +0100 | [diff] [blame] | 2745 | } |
| 2746 | } |
| 2747 | return rwco.ret; |
| 2748 | } |
| 2749 | |
Kevin Wolf | 8d3b1a2 | 2013-04-05 21:27:55 +0200 | [diff] [blame] | 2750 | /* |
| 2751 | * Process a synchronous request using coroutines |
| 2752 | */ |
| 2753 | static int bdrv_rw_co(BlockDriverState *bs, int64_t sector_num, uint8_t *buf, |
Peter Lieven | 4105eaa | 2013-07-11 14:16:22 +0200 | [diff] [blame] | 2754 | int nb_sectors, bool is_write, BdrvRequestFlags flags) |
Kevin Wolf | 8d3b1a2 | 2013-04-05 21:27:55 +0200 | [diff] [blame] | 2755 | { |
| 2756 | QEMUIOVector qiov; |
| 2757 | struct iovec iov = { |
| 2758 | .iov_base = (void *)buf, |
| 2759 | .iov_len = nb_sectors * BDRV_SECTOR_SIZE, |
| 2760 | }; |
| 2761 | |
Kevin Wolf | da15ee5 | 2014-04-14 15:39:36 +0200 | [diff] [blame] | 2762 | if (nb_sectors < 0 || nb_sectors > INT_MAX / BDRV_SECTOR_SIZE) { |
| 2763 | return -EINVAL; |
| 2764 | } |
| 2765 | |
Kevin Wolf | 8d3b1a2 | 2013-04-05 21:27:55 +0200 | [diff] [blame] | 2766 | qemu_iovec_init_external(&qiov, &iov, 1); |
Kevin Wolf | 775aa8b | 2013-12-05 12:09:38 +0100 | [diff] [blame] | 2767 | return bdrv_prwv_co(bs, sector_num << BDRV_SECTOR_BITS, |
| 2768 | &qiov, is_write, flags); |
Kevin Wolf | 8d3b1a2 | 2013-04-05 21:27:55 +0200 | [diff] [blame] | 2769 | } |
| 2770 | |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 2771 | /* return < 0 if error. See bdrv_write() for the return codes */ |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 2772 | int bdrv_read(BlockDriverState *bs, int64_t sector_num, |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 2773 | uint8_t *buf, int nb_sectors) |
| 2774 | { |
Peter Lieven | 4105eaa | 2013-07-11 14:16:22 +0200 | [diff] [blame] | 2775 | return bdrv_rw_co(bs, sector_num, buf, nb_sectors, false, 0); |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 2776 | } |
| 2777 | |
Markus Armbruster | 07d27a4 | 2012-06-29 17:34:29 +0200 | [diff] [blame] | 2778 | /* Just like bdrv_read(), but with I/O throttling temporarily disabled */ |
| 2779 | int bdrv_read_unthrottled(BlockDriverState *bs, int64_t sector_num, |
| 2780 | uint8_t *buf, int nb_sectors) |
| 2781 | { |
| 2782 | bool enabled; |
| 2783 | int ret; |
| 2784 | |
| 2785 | enabled = bs->io_limits_enabled; |
| 2786 | bs->io_limits_enabled = false; |
Peter Lieven | 4e7395e | 2013-07-18 10:37:32 +0200 | [diff] [blame] | 2787 | ret = bdrv_read(bs, sector_num, buf, nb_sectors); |
Markus Armbruster | 07d27a4 | 2012-06-29 17:34:29 +0200 | [diff] [blame] | 2788 | bs->io_limits_enabled = enabled; |
| 2789 | return ret; |
| 2790 | } |
| 2791 | |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 2792 | /* Return < 0 if error. Important errors are: |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 2793 | -EIO generic I/O error (may happen for all errors) |
| 2794 | -ENOMEDIUM No media inserted. |
| 2795 | -EINVAL Invalid sector number or nb_sectors |
| 2796 | -EACCES Trying to write a read-only device |
| 2797 | */ |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 2798 | int bdrv_write(BlockDriverState *bs, int64_t sector_num, |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 2799 | const uint8_t *buf, int nb_sectors) |
| 2800 | { |
Peter Lieven | 4105eaa | 2013-07-11 14:16:22 +0200 | [diff] [blame] | 2801 | return bdrv_rw_co(bs, sector_num, (uint8_t *)buf, nb_sectors, true, 0); |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 2802 | } |
| 2803 | |
Peter Lieven | aa7bfbf | 2013-10-24 12:06:51 +0200 | [diff] [blame] | 2804 | int bdrv_write_zeroes(BlockDriverState *bs, int64_t sector_num, |
| 2805 | int nb_sectors, BdrvRequestFlags flags) |
Peter Lieven | 4105eaa | 2013-07-11 14:16:22 +0200 | [diff] [blame] | 2806 | { |
| 2807 | return bdrv_rw_co(bs, sector_num, NULL, nb_sectors, true, |
Peter Lieven | aa7bfbf | 2013-10-24 12:06:51 +0200 | [diff] [blame] | 2808 | BDRV_REQ_ZERO_WRITE | flags); |
Kevin Wolf | 8d3b1a2 | 2013-04-05 21:27:55 +0200 | [diff] [blame] | 2809 | } |
| 2810 | |
Peter Lieven | d75cbb5 | 2013-10-24 12:07:03 +0200 | [diff] [blame] | 2811 | /* |
| 2812 | * Completely zero out a block device with the help of bdrv_write_zeroes. |
| 2813 | * The operation is sped up by checking the block status and only writing |
| 2814 | * zeroes to the device if they currently do not return zeroes. Optional |
| 2815 | * flags are passed through to bdrv_write_zeroes (e.g. BDRV_REQ_MAY_UNMAP). |
| 2816 | * |
| 2817 | * Returns < 0 on error, 0 on success. For error codes see bdrv_write(). |
| 2818 | */ |
| 2819 | int bdrv_make_zero(BlockDriverState *bs, BdrvRequestFlags flags) |
| 2820 | { |
Kevin Wolf | 9ce10c0 | 2014-04-14 17:03:34 +0200 | [diff] [blame] | 2821 | int64_t target_size; |
Peter Lieven | d75cbb5 | 2013-10-24 12:07:03 +0200 | [diff] [blame] | 2822 | int64_t ret, nb_sectors, sector_num = 0; |
| 2823 | int n; |
| 2824 | |
Kevin Wolf | 9ce10c0 | 2014-04-14 17:03:34 +0200 | [diff] [blame] | 2825 | target_size = bdrv_getlength(bs); |
| 2826 | if (target_size < 0) { |
| 2827 | return target_size; |
| 2828 | } |
| 2829 | target_size /= BDRV_SECTOR_SIZE; |
| 2830 | |
Peter Lieven | d75cbb5 | 2013-10-24 12:07:03 +0200 | [diff] [blame] | 2831 | for (;;) { |
| 2832 | nb_sectors = target_size - sector_num; |
| 2833 | if (nb_sectors <= 0) { |
| 2834 | return 0; |
| 2835 | } |
| 2836 | if (nb_sectors > INT_MAX) { |
| 2837 | nb_sectors = INT_MAX; |
| 2838 | } |
| 2839 | ret = bdrv_get_block_status(bs, sector_num, nb_sectors, &n); |
Peter Lieven | 3d94ce6 | 2013-12-12 13:57:05 +0100 | [diff] [blame] | 2840 | if (ret < 0) { |
| 2841 | error_report("error getting block status at sector %" PRId64 ": %s", |
| 2842 | sector_num, strerror(-ret)); |
| 2843 | return ret; |
| 2844 | } |
Peter Lieven | d75cbb5 | 2013-10-24 12:07:03 +0200 | [diff] [blame] | 2845 | if (ret & BDRV_BLOCK_ZERO) { |
| 2846 | sector_num += n; |
| 2847 | continue; |
| 2848 | } |
| 2849 | ret = bdrv_write_zeroes(bs, sector_num, n, flags); |
| 2850 | if (ret < 0) { |
| 2851 | error_report("error writing zeroes at sector %" PRId64 ": %s", |
| 2852 | sector_num, strerror(-ret)); |
| 2853 | return ret; |
| 2854 | } |
| 2855 | sector_num += n; |
| 2856 | } |
| 2857 | } |
| 2858 | |
Kevin Wolf | a3ef657 | 2013-12-05 12:29:59 +0100 | [diff] [blame] | 2859 | int bdrv_pread(BlockDriverState *bs, int64_t offset, void *buf, int bytes) |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 2860 | { |
Kevin Wolf | a3ef657 | 2013-12-05 12:29:59 +0100 | [diff] [blame] | 2861 | QEMUIOVector qiov; |
| 2862 | struct iovec iov = { |
| 2863 | .iov_base = (void *)buf, |
| 2864 | .iov_len = bytes, |
| 2865 | }; |
Kevin Wolf | 9a8c4cc | 2010-01-20 15:03:02 +0100 | [diff] [blame] | 2866 | int ret; |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 2867 | |
Kevin Wolf | a3ef657 | 2013-12-05 12:29:59 +0100 | [diff] [blame] | 2868 | if (bytes < 0) { |
| 2869 | return -EINVAL; |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 2870 | } |
| 2871 | |
Kevin Wolf | a3ef657 | 2013-12-05 12:29:59 +0100 | [diff] [blame] | 2872 | qemu_iovec_init_external(&qiov, &iov, 1); |
| 2873 | ret = bdrv_prwv_co(bs, offset, &qiov, false, 0); |
| 2874 | if (ret < 0) { |
| 2875 | return ret; |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 2876 | } |
| 2877 | |
Kevin Wolf | a3ef657 | 2013-12-05 12:29:59 +0100 | [diff] [blame] | 2878 | return bytes; |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 2879 | } |
| 2880 | |
Kevin Wolf | 8d3b1a2 | 2013-04-05 21:27:55 +0200 | [diff] [blame] | 2881 | int bdrv_pwritev(BlockDriverState *bs, int64_t offset, QEMUIOVector *qiov) |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 2882 | { |
Kevin Wolf | 9a8c4cc | 2010-01-20 15:03:02 +0100 | [diff] [blame] | 2883 | int ret; |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 2884 | |
Kevin Wolf | 8407d5d | 2013-12-05 12:34:02 +0100 | [diff] [blame] | 2885 | ret = bdrv_prwv_co(bs, offset, qiov, true, 0); |
| 2886 | if (ret < 0) { |
| 2887 | return ret; |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 2888 | } |
| 2889 | |
Kevin Wolf | 8d3b1a2 | 2013-04-05 21:27:55 +0200 | [diff] [blame] | 2890 | return qiov->size; |
| 2891 | } |
| 2892 | |
| 2893 | int bdrv_pwrite(BlockDriverState *bs, int64_t offset, |
Kevin Wolf | 8407d5d | 2013-12-05 12:34:02 +0100 | [diff] [blame] | 2894 | const void *buf, int bytes) |
Kevin Wolf | 8d3b1a2 | 2013-04-05 21:27:55 +0200 | [diff] [blame] | 2895 | { |
| 2896 | QEMUIOVector qiov; |
| 2897 | struct iovec iov = { |
| 2898 | .iov_base = (void *) buf, |
Kevin Wolf | 8407d5d | 2013-12-05 12:34:02 +0100 | [diff] [blame] | 2899 | .iov_len = bytes, |
Kevin Wolf | 8d3b1a2 | 2013-04-05 21:27:55 +0200 | [diff] [blame] | 2900 | }; |
| 2901 | |
Kevin Wolf | 8407d5d | 2013-12-05 12:34:02 +0100 | [diff] [blame] | 2902 | if (bytes < 0) { |
| 2903 | return -EINVAL; |
| 2904 | } |
| 2905 | |
Kevin Wolf | 8d3b1a2 | 2013-04-05 21:27:55 +0200 | [diff] [blame] | 2906 | qemu_iovec_init_external(&qiov, &iov, 1); |
| 2907 | return bdrv_pwritev(bs, offset, &qiov); |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 2908 | } |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 2909 | |
Kevin Wolf | f08145f | 2010-06-16 16:38:15 +0200 | [diff] [blame] | 2910 | /* |
| 2911 | * Writes to the file and ensures that no writes are reordered across this |
| 2912 | * request (acts as a barrier) |
| 2913 | * |
| 2914 | * Returns 0 on success, -errno in error cases. |
| 2915 | */ |
| 2916 | int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset, |
| 2917 | const void *buf, int count) |
| 2918 | { |
| 2919 | int ret; |
| 2920 | |
| 2921 | ret = bdrv_pwrite(bs, offset, buf, count); |
| 2922 | if (ret < 0) { |
| 2923 | return ret; |
| 2924 | } |
| 2925 | |
Paolo Bonzini | f05fa4a | 2012-06-06 00:04:49 +0200 | [diff] [blame] | 2926 | /* No flush needed for cache modes that already do it */ |
| 2927 | if (bs->enable_write_cache) { |
Kevin Wolf | f08145f | 2010-06-16 16:38:15 +0200 | [diff] [blame] | 2928 | bdrv_flush(bs); |
| 2929 | } |
| 2930 | |
| 2931 | return 0; |
| 2932 | } |
| 2933 | |
Stefan Hajnoczi | 470c050 | 2012-01-18 14:40:42 +0000 | [diff] [blame] | 2934 | static int coroutine_fn bdrv_co_do_copy_on_readv(BlockDriverState *bs, |
Stefan Hajnoczi | ab18592 | 2011-11-17 13:40:31 +0000 | [diff] [blame] | 2935 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) |
| 2936 | { |
| 2937 | /* Perform I/O through a temporary buffer so that users who scribble over |
| 2938 | * their read buffer while the operation is in progress do not end up |
| 2939 | * modifying the image file. This is critical for zero-copy guest I/O |
| 2940 | * where anything might happen inside guest memory. |
| 2941 | */ |
| 2942 | void *bounce_buffer; |
| 2943 | |
Stefan Hajnoczi | 79c053b | 2012-02-07 13:27:26 +0000 | [diff] [blame] | 2944 | BlockDriver *drv = bs->drv; |
Stefan Hajnoczi | ab18592 | 2011-11-17 13:40:31 +0000 | [diff] [blame] | 2945 | struct iovec iov; |
| 2946 | QEMUIOVector bounce_qiov; |
| 2947 | int64_t cluster_sector_num; |
| 2948 | int cluster_nb_sectors; |
| 2949 | size_t skip_bytes; |
| 2950 | int ret; |
| 2951 | |
| 2952 | /* Cover entire cluster so no additional backing file I/O is required when |
| 2953 | * allocating cluster in the image file. |
| 2954 | */ |
Paolo Bonzini | 343bded | 2013-01-21 17:09:42 +0100 | [diff] [blame] | 2955 | bdrv_round_to_clusters(bs, sector_num, nb_sectors, |
| 2956 | &cluster_sector_num, &cluster_nb_sectors); |
Stefan Hajnoczi | ab18592 | 2011-11-17 13:40:31 +0000 | [diff] [blame] | 2957 | |
Stefan Hajnoczi | 470c050 | 2012-01-18 14:40:42 +0000 | [diff] [blame] | 2958 | trace_bdrv_co_do_copy_on_readv(bs, sector_num, nb_sectors, |
| 2959 | cluster_sector_num, cluster_nb_sectors); |
Stefan Hajnoczi | ab18592 | 2011-11-17 13:40:31 +0000 | [diff] [blame] | 2960 | |
| 2961 | iov.iov_len = cluster_nb_sectors * BDRV_SECTOR_SIZE; |
| 2962 | iov.iov_base = bounce_buffer = qemu_blockalign(bs, iov.iov_len); |
| 2963 | qemu_iovec_init_external(&bounce_qiov, &iov, 1); |
| 2964 | |
Stefan Hajnoczi | 79c053b | 2012-02-07 13:27:26 +0000 | [diff] [blame] | 2965 | ret = drv->bdrv_co_readv(bs, cluster_sector_num, cluster_nb_sectors, |
| 2966 | &bounce_qiov); |
Stefan Hajnoczi | ab18592 | 2011-11-17 13:40:31 +0000 | [diff] [blame] | 2967 | if (ret < 0) { |
| 2968 | goto err; |
| 2969 | } |
| 2970 | |
Stefan Hajnoczi | 79c053b | 2012-02-07 13:27:26 +0000 | [diff] [blame] | 2971 | if (drv->bdrv_co_write_zeroes && |
| 2972 | buffer_is_zero(bounce_buffer, iov.iov_len)) { |
Kevin Wolf | 621f058 | 2012-03-20 15:12:58 +0100 | [diff] [blame] | 2973 | ret = bdrv_co_do_write_zeroes(bs, cluster_sector_num, |
Peter Lieven | aa7bfbf | 2013-10-24 12:06:51 +0200 | [diff] [blame] | 2974 | cluster_nb_sectors, 0); |
Stefan Hajnoczi | 79c053b | 2012-02-07 13:27:26 +0000 | [diff] [blame] | 2975 | } else { |
Paolo Bonzini | f05fa4a | 2012-06-06 00:04:49 +0200 | [diff] [blame] | 2976 | /* This does not change the data on the disk, it is not necessary |
| 2977 | * to flush even in cache=writethrough mode. |
| 2978 | */ |
Stefan Hajnoczi | 79c053b | 2012-02-07 13:27:26 +0000 | [diff] [blame] | 2979 | ret = drv->bdrv_co_writev(bs, cluster_sector_num, cluster_nb_sectors, |
Stefan Hajnoczi | ab18592 | 2011-11-17 13:40:31 +0000 | [diff] [blame] | 2980 | &bounce_qiov); |
Stefan Hajnoczi | 79c053b | 2012-02-07 13:27:26 +0000 | [diff] [blame] | 2981 | } |
| 2982 | |
Stefan Hajnoczi | ab18592 | 2011-11-17 13:40:31 +0000 | [diff] [blame] | 2983 | if (ret < 0) { |
| 2984 | /* It might be okay to ignore write errors for guest requests. If this |
| 2985 | * is a deliberate copy-on-read then we don't want to ignore the error. |
| 2986 | * Simply report it in all cases. |
| 2987 | */ |
| 2988 | goto err; |
| 2989 | } |
| 2990 | |
| 2991 | skip_bytes = (sector_num - cluster_sector_num) * BDRV_SECTOR_SIZE; |
Michael Tokarev | 0339614 | 2012-06-07 20:17:55 +0400 | [diff] [blame] | 2992 | qemu_iovec_from_buf(qiov, 0, bounce_buffer + skip_bytes, |
| 2993 | nb_sectors * BDRV_SECTOR_SIZE); |
Stefan Hajnoczi | ab18592 | 2011-11-17 13:40:31 +0000 | [diff] [blame] | 2994 | |
| 2995 | err: |
| 2996 | qemu_vfree(bounce_buffer); |
| 2997 | return ret; |
| 2998 | } |
| 2999 | |
Stefan Hajnoczi | c5fbe57 | 2011-10-05 17:17:03 +0100 | [diff] [blame] | 3000 | /* |
Kevin Wolf | d0c7f64 | 2013-12-02 15:07:48 +0100 | [diff] [blame] | 3001 | * Forwards an already correctly aligned request to the BlockDriver. This |
| 3002 | * handles copy on read and zeroing after EOF; any other features must be |
| 3003 | * implemented by the caller. |
Stefan Hajnoczi | c5fbe57 | 2011-10-05 17:17:03 +0100 | [diff] [blame] | 3004 | */ |
Kevin Wolf | d0c7f64 | 2013-12-02 15:07:48 +0100 | [diff] [blame] | 3005 | static int coroutine_fn bdrv_aligned_preadv(BlockDriverState *bs, |
Kevin Wolf | 65afd21 | 2013-12-03 14:55:55 +0100 | [diff] [blame] | 3006 | BdrvTrackedRequest *req, int64_t offset, unsigned int bytes, |
Kevin Wolf | ec746e1 | 2013-12-04 12:13:10 +0100 | [diff] [blame] | 3007 | int64_t align, QEMUIOVector *qiov, int flags) |
Kevin Wolf | da1fa91 | 2011-07-14 17:27:13 +0200 | [diff] [blame] | 3008 | { |
| 3009 | BlockDriver *drv = bs->drv; |
Stefan Hajnoczi | dbffbdc | 2011-11-17 13:40:27 +0000 | [diff] [blame] | 3010 | int ret; |
Kevin Wolf | da1fa91 | 2011-07-14 17:27:13 +0200 | [diff] [blame] | 3011 | |
Kevin Wolf | d0c7f64 | 2013-12-02 15:07:48 +0100 | [diff] [blame] | 3012 | int64_t sector_num = offset >> BDRV_SECTOR_BITS; |
| 3013 | unsigned int nb_sectors = bytes >> BDRV_SECTOR_BITS; |
Kevin Wolf | da1fa91 | 2011-07-14 17:27:13 +0200 | [diff] [blame] | 3014 | |
Kevin Wolf | d0c7f64 | 2013-12-02 15:07:48 +0100 | [diff] [blame] | 3015 | assert((offset & (BDRV_SECTOR_SIZE - 1)) == 0); |
| 3016 | assert((bytes & (BDRV_SECTOR_SIZE - 1)) == 0); |
| 3017 | |
| 3018 | /* Handle Copy on Read and associated serialisation */ |
Stefan Hajnoczi | 470c050 | 2012-01-18 14:40:42 +0000 | [diff] [blame] | 3019 | if (flags & BDRV_REQ_COPY_ON_READ) { |
Kevin Wolf | 7327145 | 2013-12-04 17:08:50 +0100 | [diff] [blame] | 3020 | /* If we touch the same cluster it counts as an overlap. This |
| 3021 | * guarantees that allocating writes will be serialized and not race |
| 3022 | * with each other for the same cluster. For example, in copy-on-read |
| 3023 | * it ensures that the CoR read and write operations are atomic and |
| 3024 | * guest writes cannot interleave between them. */ |
| 3025 | mark_request_serialising(req, bdrv_get_cluster_size(bs)); |
Stefan Hajnoczi | 470c050 | 2012-01-18 14:40:42 +0000 | [diff] [blame] | 3026 | } |
| 3027 | |
Kevin Wolf | 2dbafdc | 2013-12-04 16:43:44 +0100 | [diff] [blame] | 3028 | wait_serialising_requests(req); |
Stefan Hajnoczi | f465828 | 2011-11-17 13:40:29 +0000 | [diff] [blame] | 3029 | |
Stefan Hajnoczi | 470c050 | 2012-01-18 14:40:42 +0000 | [diff] [blame] | 3030 | if (flags & BDRV_REQ_COPY_ON_READ) { |
Stefan Hajnoczi | ab18592 | 2011-11-17 13:40:31 +0000 | [diff] [blame] | 3031 | int pnum; |
| 3032 | |
Paolo Bonzini | bdad13b | 2013-09-04 19:00:22 +0200 | [diff] [blame] | 3033 | ret = bdrv_is_allocated(bs, sector_num, nb_sectors, &pnum); |
Stefan Hajnoczi | ab18592 | 2011-11-17 13:40:31 +0000 | [diff] [blame] | 3034 | if (ret < 0) { |
| 3035 | goto out; |
| 3036 | } |
| 3037 | |
| 3038 | if (!ret || pnum != nb_sectors) { |
Stefan Hajnoczi | 470c050 | 2012-01-18 14:40:42 +0000 | [diff] [blame] | 3039 | ret = bdrv_co_do_copy_on_readv(bs, sector_num, nb_sectors, qiov); |
Stefan Hajnoczi | ab18592 | 2011-11-17 13:40:31 +0000 | [diff] [blame] | 3040 | goto out; |
| 3041 | } |
| 3042 | } |
| 3043 | |
Kevin Wolf | d0c7f64 | 2013-12-02 15:07:48 +0100 | [diff] [blame] | 3044 | /* Forward the request to the BlockDriver */ |
MORITA Kazutaka | 893a8f6 | 2013-08-06 09:53:40 +0800 | [diff] [blame] | 3045 | if (!(bs->zero_beyond_eof && bs->growable)) { |
| 3046 | ret = drv->bdrv_co_readv(bs, sector_num, nb_sectors, qiov); |
| 3047 | } else { |
| 3048 | /* Read zeros after EOF of growable BDSes */ |
| 3049 | int64_t len, total_sectors, max_nb_sectors; |
| 3050 | |
| 3051 | len = bdrv_getlength(bs); |
| 3052 | if (len < 0) { |
| 3053 | ret = len; |
| 3054 | goto out; |
| 3055 | } |
| 3056 | |
Fam Zheng | d055a1f | 2013-09-26 19:55:33 +0800 | [diff] [blame] | 3057 | total_sectors = DIV_ROUND_UP(len, BDRV_SECTOR_SIZE); |
Kevin Wolf | 5f5bcd8 | 2014-02-07 16:00:09 +0100 | [diff] [blame] | 3058 | max_nb_sectors = ROUND_UP(MAX(0, total_sectors - sector_num), |
| 3059 | align >> BDRV_SECTOR_BITS); |
MORITA Kazutaka | 893a8f6 | 2013-08-06 09:53:40 +0800 | [diff] [blame] | 3060 | if (max_nb_sectors > 0) { |
| 3061 | ret = drv->bdrv_co_readv(bs, sector_num, |
| 3062 | MIN(nb_sectors, max_nb_sectors), qiov); |
| 3063 | } else { |
| 3064 | ret = 0; |
| 3065 | } |
| 3066 | |
| 3067 | /* Reading beyond end of file is supposed to produce zeroes */ |
| 3068 | if (ret == 0 && total_sectors < sector_num + nb_sectors) { |
| 3069 | uint64_t offset = MAX(0, total_sectors - sector_num); |
| 3070 | uint64_t bytes = (sector_num + nb_sectors - offset) * |
| 3071 | BDRV_SECTOR_SIZE; |
| 3072 | qemu_iovec_memset(qiov, offset * BDRV_SECTOR_SIZE, 0, bytes); |
| 3073 | } |
| 3074 | } |
Stefan Hajnoczi | ab18592 | 2011-11-17 13:40:31 +0000 | [diff] [blame] | 3075 | |
| 3076 | out: |
Stefan Hajnoczi | dbffbdc | 2011-11-17 13:40:27 +0000 | [diff] [blame] | 3077 | return ret; |
Kevin Wolf | da1fa91 | 2011-07-14 17:27:13 +0200 | [diff] [blame] | 3078 | } |
| 3079 | |
Kevin Wolf | d0c7f64 | 2013-12-02 15:07:48 +0100 | [diff] [blame] | 3080 | /* |
| 3081 | * Handle a read request in coroutine context |
| 3082 | */ |
Kevin Wolf | 1b0288a | 2013-12-02 16:09:46 +0100 | [diff] [blame] | 3083 | static int coroutine_fn bdrv_co_do_preadv(BlockDriverState *bs, |
| 3084 | int64_t offset, unsigned int bytes, QEMUIOVector *qiov, |
Kevin Wolf | d0c7f64 | 2013-12-02 15:07:48 +0100 | [diff] [blame] | 3085 | BdrvRequestFlags flags) |
| 3086 | { |
| 3087 | BlockDriver *drv = bs->drv; |
Kevin Wolf | 65afd21 | 2013-12-03 14:55:55 +0100 | [diff] [blame] | 3088 | BdrvTrackedRequest req; |
| 3089 | |
Kevin Wolf | 1b0288a | 2013-12-02 16:09:46 +0100 | [diff] [blame] | 3090 | /* TODO Lift BDRV_SECTOR_SIZE restriction in BlockDriver interface */ |
| 3091 | uint64_t align = MAX(BDRV_SECTOR_SIZE, bs->request_alignment); |
| 3092 | uint8_t *head_buf = NULL; |
| 3093 | uint8_t *tail_buf = NULL; |
| 3094 | QEMUIOVector local_qiov; |
| 3095 | bool use_local_qiov = false; |
Kevin Wolf | d0c7f64 | 2013-12-02 15:07:48 +0100 | [diff] [blame] | 3096 | int ret; |
| 3097 | |
| 3098 | if (!drv) { |
| 3099 | return -ENOMEDIUM; |
| 3100 | } |
Kevin Wolf | 1b0288a | 2013-12-02 16:09:46 +0100 | [diff] [blame] | 3101 | if (bdrv_check_byte_request(bs, offset, bytes)) { |
Kevin Wolf | d0c7f64 | 2013-12-02 15:07:48 +0100 | [diff] [blame] | 3102 | return -EIO; |
| 3103 | } |
| 3104 | |
| 3105 | if (bs->copy_on_read) { |
| 3106 | flags |= BDRV_REQ_COPY_ON_READ; |
| 3107 | } |
| 3108 | |
| 3109 | /* throttling disk I/O */ |
| 3110 | if (bs->io_limits_enabled) { |
Kevin Wolf | d510358 | 2014-01-16 13:29:10 +0100 | [diff] [blame] | 3111 | bdrv_io_limits_intercept(bs, bytes, false); |
Kevin Wolf | d0c7f64 | 2013-12-02 15:07:48 +0100 | [diff] [blame] | 3112 | } |
| 3113 | |
Kevin Wolf | 1b0288a | 2013-12-02 16:09:46 +0100 | [diff] [blame] | 3114 | /* Align read if necessary by padding qiov */ |
| 3115 | if (offset & (align - 1)) { |
| 3116 | head_buf = qemu_blockalign(bs, align); |
| 3117 | qemu_iovec_init(&local_qiov, qiov->niov + 2); |
| 3118 | qemu_iovec_add(&local_qiov, head_buf, offset & (align - 1)); |
| 3119 | qemu_iovec_concat(&local_qiov, qiov, 0, qiov->size); |
| 3120 | use_local_qiov = true; |
| 3121 | |
| 3122 | bytes += offset & (align - 1); |
| 3123 | offset = offset & ~(align - 1); |
| 3124 | } |
| 3125 | |
| 3126 | if ((offset + bytes) & (align - 1)) { |
| 3127 | if (!use_local_qiov) { |
| 3128 | qemu_iovec_init(&local_qiov, qiov->niov + 1); |
| 3129 | qemu_iovec_concat(&local_qiov, qiov, 0, qiov->size); |
| 3130 | use_local_qiov = true; |
| 3131 | } |
| 3132 | tail_buf = qemu_blockalign(bs, align); |
| 3133 | qemu_iovec_add(&local_qiov, tail_buf, |
| 3134 | align - ((offset + bytes) & (align - 1))); |
| 3135 | |
| 3136 | bytes = ROUND_UP(bytes, align); |
| 3137 | } |
| 3138 | |
Kevin Wolf | 65afd21 | 2013-12-03 14:55:55 +0100 | [diff] [blame] | 3139 | tracked_request_begin(&req, bs, offset, bytes, false); |
Kevin Wolf | ec746e1 | 2013-12-04 12:13:10 +0100 | [diff] [blame] | 3140 | ret = bdrv_aligned_preadv(bs, &req, offset, bytes, align, |
Kevin Wolf | 1b0288a | 2013-12-02 16:09:46 +0100 | [diff] [blame] | 3141 | use_local_qiov ? &local_qiov : qiov, |
| 3142 | flags); |
Kevin Wolf | 65afd21 | 2013-12-03 14:55:55 +0100 | [diff] [blame] | 3143 | tracked_request_end(&req); |
Kevin Wolf | 1b0288a | 2013-12-02 16:09:46 +0100 | [diff] [blame] | 3144 | |
| 3145 | if (use_local_qiov) { |
| 3146 | qemu_iovec_destroy(&local_qiov); |
| 3147 | qemu_vfree(head_buf); |
| 3148 | qemu_vfree(tail_buf); |
| 3149 | } |
| 3150 | |
Kevin Wolf | d0c7f64 | 2013-12-02 15:07:48 +0100 | [diff] [blame] | 3151 | return ret; |
| 3152 | } |
| 3153 | |
Kevin Wolf | 1b0288a | 2013-12-02 16:09:46 +0100 | [diff] [blame] | 3154 | static int coroutine_fn bdrv_co_do_readv(BlockDriverState *bs, |
| 3155 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, |
| 3156 | BdrvRequestFlags flags) |
| 3157 | { |
| 3158 | if (nb_sectors < 0 || nb_sectors > (UINT_MAX >> BDRV_SECTOR_BITS)) { |
| 3159 | return -EINVAL; |
| 3160 | } |
| 3161 | |
| 3162 | return bdrv_co_do_preadv(bs, sector_num << BDRV_SECTOR_BITS, |
| 3163 | nb_sectors << BDRV_SECTOR_BITS, qiov, flags); |
| 3164 | } |
| 3165 | |
Stefan Hajnoczi | c5fbe57 | 2011-10-05 17:17:03 +0100 | [diff] [blame] | 3166 | int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num, |
Kevin Wolf | da1fa91 | 2011-07-14 17:27:13 +0200 | [diff] [blame] | 3167 | int nb_sectors, QEMUIOVector *qiov) |
| 3168 | { |
Stefan Hajnoczi | c5fbe57 | 2011-10-05 17:17:03 +0100 | [diff] [blame] | 3169 | trace_bdrv_co_readv(bs, sector_num, nb_sectors); |
Kevin Wolf | da1fa91 | 2011-07-14 17:27:13 +0200 | [diff] [blame] | 3170 | |
Stefan Hajnoczi | 470c050 | 2012-01-18 14:40:42 +0000 | [diff] [blame] | 3171 | return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov, 0); |
| 3172 | } |
| 3173 | |
| 3174 | int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs, |
| 3175 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov) |
| 3176 | { |
| 3177 | trace_bdrv_co_copy_on_readv(bs, sector_num, nb_sectors); |
| 3178 | |
| 3179 | return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov, |
| 3180 | BDRV_REQ_COPY_ON_READ); |
Stefan Hajnoczi | c5fbe57 | 2011-10-05 17:17:03 +0100 | [diff] [blame] | 3181 | } |
| 3182 | |
Peter Lieven | c31cb70 | 2013-10-24 12:06:58 +0200 | [diff] [blame] | 3183 | /* if no limit is specified in the BlockLimits use a default |
| 3184 | * of 32768 512-byte sectors (16 MiB) per request. |
| 3185 | */ |
| 3186 | #define MAX_WRITE_ZEROES_DEFAULT 32768 |
| 3187 | |
Stefan Hajnoczi | f08f2dd | 2012-02-07 13:27:25 +0000 | [diff] [blame] | 3188 | static int coroutine_fn bdrv_co_do_write_zeroes(BlockDriverState *bs, |
Peter Lieven | aa7bfbf | 2013-10-24 12:06:51 +0200 | [diff] [blame] | 3189 | int64_t sector_num, int nb_sectors, BdrvRequestFlags flags) |
Stefan Hajnoczi | f08f2dd | 2012-02-07 13:27:25 +0000 | [diff] [blame] | 3190 | { |
| 3191 | BlockDriver *drv = bs->drv; |
| 3192 | QEMUIOVector qiov; |
Peter Lieven | c31cb70 | 2013-10-24 12:06:58 +0200 | [diff] [blame] | 3193 | struct iovec iov = {0}; |
| 3194 | int ret = 0; |
Stefan Hajnoczi | f08f2dd | 2012-02-07 13:27:25 +0000 | [diff] [blame] | 3195 | |
Peter Lieven | c31cb70 | 2013-10-24 12:06:58 +0200 | [diff] [blame] | 3196 | int max_write_zeroes = bs->bl.max_write_zeroes ? |
| 3197 | bs->bl.max_write_zeroes : MAX_WRITE_ZEROES_DEFAULT; |
Kevin Wolf | 621f058 | 2012-03-20 15:12:58 +0100 | [diff] [blame] | 3198 | |
Peter Lieven | c31cb70 | 2013-10-24 12:06:58 +0200 | [diff] [blame] | 3199 | while (nb_sectors > 0 && !ret) { |
| 3200 | int num = nb_sectors; |
| 3201 | |
Paolo Bonzini | b8d71c0 | 2013-11-22 13:39:48 +0100 | [diff] [blame] | 3202 | /* Align request. Block drivers can expect the "bulk" of the request |
| 3203 | * to be aligned. |
| 3204 | */ |
| 3205 | if (bs->bl.write_zeroes_alignment |
| 3206 | && num > bs->bl.write_zeroes_alignment) { |
| 3207 | if (sector_num % bs->bl.write_zeroes_alignment != 0) { |
| 3208 | /* Make a small request up to the first aligned sector. */ |
Peter Lieven | c31cb70 | 2013-10-24 12:06:58 +0200 | [diff] [blame] | 3209 | num = bs->bl.write_zeroes_alignment; |
Paolo Bonzini | b8d71c0 | 2013-11-22 13:39:48 +0100 | [diff] [blame] | 3210 | num -= sector_num % bs->bl.write_zeroes_alignment; |
| 3211 | } else if ((sector_num + num) % bs->bl.write_zeroes_alignment != 0) { |
| 3212 | /* Shorten the request to the last aligned sector. num cannot |
| 3213 | * underflow because num > bs->bl.write_zeroes_alignment. |
| 3214 | */ |
| 3215 | num -= (sector_num + num) % bs->bl.write_zeroes_alignment; |
Peter Lieven | c31cb70 | 2013-10-24 12:06:58 +0200 | [diff] [blame] | 3216 | } |
Kevin Wolf | 621f058 | 2012-03-20 15:12:58 +0100 | [diff] [blame] | 3217 | } |
Peter Lieven | c31cb70 | 2013-10-24 12:06:58 +0200 | [diff] [blame] | 3218 | |
| 3219 | /* limit request size */ |
| 3220 | if (num > max_write_zeroes) { |
| 3221 | num = max_write_zeroes; |
| 3222 | } |
| 3223 | |
| 3224 | ret = -ENOTSUP; |
| 3225 | /* First try the efficient write zeroes operation */ |
| 3226 | if (drv->bdrv_co_write_zeroes) { |
| 3227 | ret = drv->bdrv_co_write_zeroes(bs, sector_num, num, flags); |
| 3228 | } |
| 3229 | |
| 3230 | if (ret == -ENOTSUP) { |
| 3231 | /* Fall back to bounce buffer if write zeroes is unsupported */ |
| 3232 | iov.iov_len = num * BDRV_SECTOR_SIZE; |
| 3233 | if (iov.iov_base == NULL) { |
Paolo Bonzini | b8d71c0 | 2013-11-22 13:39:48 +0100 | [diff] [blame] | 3234 | iov.iov_base = qemu_blockalign(bs, num * BDRV_SECTOR_SIZE); |
| 3235 | memset(iov.iov_base, 0, num * BDRV_SECTOR_SIZE); |
Peter Lieven | c31cb70 | 2013-10-24 12:06:58 +0200 | [diff] [blame] | 3236 | } |
| 3237 | qemu_iovec_init_external(&qiov, &iov, 1); |
| 3238 | |
| 3239 | ret = drv->bdrv_co_writev(bs, sector_num, num, &qiov); |
Paolo Bonzini | b8d71c0 | 2013-11-22 13:39:48 +0100 | [diff] [blame] | 3240 | |
| 3241 | /* Keep bounce buffer around if it is big enough for all |
| 3242 | * all future requests. |
| 3243 | */ |
| 3244 | if (num < max_write_zeroes) { |
| 3245 | qemu_vfree(iov.iov_base); |
| 3246 | iov.iov_base = NULL; |
| 3247 | } |
Peter Lieven | c31cb70 | 2013-10-24 12:06:58 +0200 | [diff] [blame] | 3248 | } |
| 3249 | |
| 3250 | sector_num += num; |
| 3251 | nb_sectors -= num; |
Stefan Hajnoczi | f08f2dd | 2012-02-07 13:27:25 +0000 | [diff] [blame] | 3252 | } |
| 3253 | |
Stefan Hajnoczi | f08f2dd | 2012-02-07 13:27:25 +0000 | [diff] [blame] | 3254 | qemu_vfree(iov.iov_base); |
| 3255 | return ret; |
| 3256 | } |
| 3257 | |
Stefan Hajnoczi | c5fbe57 | 2011-10-05 17:17:03 +0100 | [diff] [blame] | 3258 | /* |
Kevin Wolf | b404f72 | 2013-12-03 14:02:23 +0100 | [diff] [blame] | 3259 | * Forwards an already correctly aligned write request to the BlockDriver. |
Stefan Hajnoczi | c5fbe57 | 2011-10-05 17:17:03 +0100 | [diff] [blame] | 3260 | */ |
Kevin Wolf | b404f72 | 2013-12-03 14:02:23 +0100 | [diff] [blame] | 3261 | static int coroutine_fn bdrv_aligned_pwritev(BlockDriverState *bs, |
Kevin Wolf | 65afd21 | 2013-12-03 14:55:55 +0100 | [diff] [blame] | 3262 | BdrvTrackedRequest *req, int64_t offset, unsigned int bytes, |
| 3263 | QEMUIOVector *qiov, int flags) |
Stefan Hajnoczi | c5fbe57 | 2011-10-05 17:17:03 +0100 | [diff] [blame] | 3264 | { |
| 3265 | BlockDriver *drv = bs->drv; |
Kevin Wolf | 28de2dc | 2014-01-14 11:41:35 +0100 | [diff] [blame] | 3266 | bool waited; |
Stefan Hajnoczi | 6b7cb24 | 2011-10-13 13:08:24 +0100 | [diff] [blame] | 3267 | int ret; |
Kevin Wolf | da1fa91 | 2011-07-14 17:27:13 +0200 | [diff] [blame] | 3268 | |
Kevin Wolf | b404f72 | 2013-12-03 14:02:23 +0100 | [diff] [blame] | 3269 | int64_t sector_num = offset >> BDRV_SECTOR_BITS; |
| 3270 | unsigned int nb_sectors = bytes >> BDRV_SECTOR_BITS; |
Kevin Wolf | da1fa91 | 2011-07-14 17:27:13 +0200 | [diff] [blame] | 3271 | |
Kevin Wolf | b404f72 | 2013-12-03 14:02:23 +0100 | [diff] [blame] | 3272 | assert((offset & (BDRV_SECTOR_SIZE - 1)) == 0); |
| 3273 | assert((bytes & (BDRV_SECTOR_SIZE - 1)) == 0); |
Benoît Canet | cc0681c | 2013-09-02 14:14:39 +0200 | [diff] [blame] | 3274 | |
Kevin Wolf | 28de2dc | 2014-01-14 11:41:35 +0100 | [diff] [blame] | 3275 | waited = wait_serialising_requests(req); |
| 3276 | assert(!waited || !req->serialising); |
Kevin Wolf | af91f9a | 2014-02-07 15:35:56 +0100 | [diff] [blame] | 3277 | assert(req->overlap_offset <= offset); |
| 3278 | assert(offset + bytes <= req->overlap_offset + req->overlap_bytes); |
Kevin Wolf | 244eade | 2013-12-03 14:30:44 +0100 | [diff] [blame] | 3279 | |
Kevin Wolf | 65afd21 | 2013-12-03 14:55:55 +0100 | [diff] [blame] | 3280 | ret = notifier_with_return_list_notify(&bs->before_write_notifiers, req); |
Stefan Hajnoczi | d616b22 | 2013-06-24 17:13:10 +0200 | [diff] [blame] | 3281 | |
Peter Lieven | 465bee1 | 2014-05-18 00:58:19 +0200 | [diff] [blame] | 3282 | if (!ret && bs->detect_zeroes != BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF && |
| 3283 | !(flags & BDRV_REQ_ZERO_WRITE) && drv->bdrv_co_write_zeroes && |
| 3284 | qemu_iovec_is_zero(qiov)) { |
| 3285 | flags |= BDRV_REQ_ZERO_WRITE; |
| 3286 | if (bs->detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP) { |
| 3287 | flags |= BDRV_REQ_MAY_UNMAP; |
| 3288 | } |
| 3289 | } |
| 3290 | |
Stefan Hajnoczi | d616b22 | 2013-06-24 17:13:10 +0200 | [diff] [blame] | 3291 | if (ret < 0) { |
| 3292 | /* Do nothing, write notifier decided to fail this request */ |
| 3293 | } else if (flags & BDRV_REQ_ZERO_WRITE) { |
Kevin Wolf | 9e1cb96 | 2014-01-14 15:37:03 +0100 | [diff] [blame] | 3294 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV_ZERO); |
Peter Lieven | aa7bfbf | 2013-10-24 12:06:51 +0200 | [diff] [blame] | 3295 | ret = bdrv_co_do_write_zeroes(bs, sector_num, nb_sectors, flags); |
Stefan Hajnoczi | f08f2dd | 2012-02-07 13:27:25 +0000 | [diff] [blame] | 3296 | } else { |
Kevin Wolf | 9e1cb96 | 2014-01-14 15:37:03 +0100 | [diff] [blame] | 3297 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV); |
Stefan Hajnoczi | f08f2dd | 2012-02-07 13:27:25 +0000 | [diff] [blame] | 3298 | ret = drv->bdrv_co_writev(bs, sector_num, nb_sectors, qiov); |
| 3299 | } |
Kevin Wolf | 9e1cb96 | 2014-01-14 15:37:03 +0100 | [diff] [blame] | 3300 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV_DONE); |
Stefan Hajnoczi | 6b7cb24 | 2011-10-13 13:08:24 +0100 | [diff] [blame] | 3301 | |
Paolo Bonzini | f05fa4a | 2012-06-06 00:04:49 +0200 | [diff] [blame] | 3302 | if (ret == 0 && !bs->enable_write_cache) { |
| 3303 | ret = bdrv_co_flush(bs); |
| 3304 | } |
| 3305 | |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 3306 | bdrv_set_dirty(bs, sector_num, nb_sectors); |
Kevin Wolf | da1fa91 | 2011-07-14 17:27:13 +0200 | [diff] [blame] | 3307 | |
| 3308 | if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { |
| 3309 | bs->wr_highest_sector = sector_num + nb_sectors - 1; |
| 3310 | } |
Paolo Bonzini | df2a6f2 | 2013-09-04 19:00:21 +0200 | [diff] [blame] | 3311 | if (bs->growable && ret >= 0) { |
| 3312 | bs->total_sectors = MAX(bs->total_sectors, sector_num + nb_sectors); |
| 3313 | } |
Kevin Wolf | da1fa91 | 2011-07-14 17:27:13 +0200 | [diff] [blame] | 3314 | |
Stefan Hajnoczi | 6b7cb24 | 2011-10-13 13:08:24 +0100 | [diff] [blame] | 3315 | return ret; |
Kevin Wolf | da1fa91 | 2011-07-14 17:27:13 +0200 | [diff] [blame] | 3316 | } |
| 3317 | |
Kevin Wolf | b404f72 | 2013-12-03 14:02:23 +0100 | [diff] [blame] | 3318 | /* |
| 3319 | * Handle a write request in coroutine context |
| 3320 | */ |
Kevin Wolf | 6601553 | 2013-12-03 14:40:18 +0100 | [diff] [blame] | 3321 | static int coroutine_fn bdrv_co_do_pwritev(BlockDriverState *bs, |
| 3322 | int64_t offset, unsigned int bytes, QEMUIOVector *qiov, |
Kevin Wolf | b404f72 | 2013-12-03 14:02:23 +0100 | [diff] [blame] | 3323 | BdrvRequestFlags flags) |
| 3324 | { |
Kevin Wolf | 65afd21 | 2013-12-03 14:55:55 +0100 | [diff] [blame] | 3325 | BdrvTrackedRequest req; |
Kevin Wolf | 3b8242e | 2013-12-03 16:34:41 +0100 | [diff] [blame] | 3326 | /* TODO Lift BDRV_SECTOR_SIZE restriction in BlockDriver interface */ |
| 3327 | uint64_t align = MAX(BDRV_SECTOR_SIZE, bs->request_alignment); |
| 3328 | uint8_t *head_buf = NULL; |
| 3329 | uint8_t *tail_buf = NULL; |
| 3330 | QEMUIOVector local_qiov; |
| 3331 | bool use_local_qiov = false; |
Kevin Wolf | b404f72 | 2013-12-03 14:02:23 +0100 | [diff] [blame] | 3332 | int ret; |
| 3333 | |
| 3334 | if (!bs->drv) { |
| 3335 | return -ENOMEDIUM; |
| 3336 | } |
| 3337 | if (bs->read_only) { |
| 3338 | return -EACCES; |
| 3339 | } |
Kevin Wolf | 6601553 | 2013-12-03 14:40:18 +0100 | [diff] [blame] | 3340 | if (bdrv_check_byte_request(bs, offset, bytes)) { |
Kevin Wolf | b404f72 | 2013-12-03 14:02:23 +0100 | [diff] [blame] | 3341 | return -EIO; |
| 3342 | } |
| 3343 | |
Kevin Wolf | b404f72 | 2013-12-03 14:02:23 +0100 | [diff] [blame] | 3344 | /* throttling disk I/O */ |
| 3345 | if (bs->io_limits_enabled) { |
Kevin Wolf | d510358 | 2014-01-16 13:29:10 +0100 | [diff] [blame] | 3346 | bdrv_io_limits_intercept(bs, bytes, true); |
Kevin Wolf | b404f72 | 2013-12-03 14:02:23 +0100 | [diff] [blame] | 3347 | } |
| 3348 | |
Kevin Wolf | 3b8242e | 2013-12-03 16:34:41 +0100 | [diff] [blame] | 3349 | /* |
| 3350 | * Align write if necessary by performing a read-modify-write cycle. |
| 3351 | * Pad qiov with the read parts and be sure to have a tracked request not |
| 3352 | * only for bdrv_aligned_pwritev, but also for the reads of the RMW cycle. |
| 3353 | */ |
Kevin Wolf | 65afd21 | 2013-12-03 14:55:55 +0100 | [diff] [blame] | 3354 | tracked_request_begin(&req, bs, offset, bytes, true); |
Kevin Wolf | 3b8242e | 2013-12-03 16:34:41 +0100 | [diff] [blame] | 3355 | |
| 3356 | if (offset & (align - 1)) { |
| 3357 | QEMUIOVector head_qiov; |
| 3358 | struct iovec head_iov; |
| 3359 | |
| 3360 | mark_request_serialising(&req, align); |
| 3361 | wait_serialising_requests(&req); |
| 3362 | |
| 3363 | head_buf = qemu_blockalign(bs, align); |
| 3364 | head_iov = (struct iovec) { |
| 3365 | .iov_base = head_buf, |
| 3366 | .iov_len = align, |
| 3367 | }; |
| 3368 | qemu_iovec_init_external(&head_qiov, &head_iov, 1); |
| 3369 | |
Kevin Wolf | 9e1cb96 | 2014-01-14 15:37:03 +0100 | [diff] [blame] | 3370 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV_RMW_HEAD); |
Kevin Wolf | 3b8242e | 2013-12-03 16:34:41 +0100 | [diff] [blame] | 3371 | ret = bdrv_aligned_preadv(bs, &req, offset & ~(align - 1), align, |
| 3372 | align, &head_qiov, 0); |
| 3373 | if (ret < 0) { |
| 3374 | goto fail; |
| 3375 | } |
Kevin Wolf | 9e1cb96 | 2014-01-14 15:37:03 +0100 | [diff] [blame] | 3376 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV_RMW_AFTER_HEAD); |
Kevin Wolf | 3b8242e | 2013-12-03 16:34:41 +0100 | [diff] [blame] | 3377 | |
| 3378 | qemu_iovec_init(&local_qiov, qiov->niov + 2); |
| 3379 | qemu_iovec_add(&local_qiov, head_buf, offset & (align - 1)); |
| 3380 | qemu_iovec_concat(&local_qiov, qiov, 0, qiov->size); |
| 3381 | use_local_qiov = true; |
| 3382 | |
| 3383 | bytes += offset & (align - 1); |
| 3384 | offset = offset & ~(align - 1); |
| 3385 | } |
| 3386 | |
| 3387 | if ((offset + bytes) & (align - 1)) { |
| 3388 | QEMUIOVector tail_qiov; |
| 3389 | struct iovec tail_iov; |
| 3390 | size_t tail_bytes; |
Kevin Wolf | 28de2dc | 2014-01-14 11:41:35 +0100 | [diff] [blame] | 3391 | bool waited; |
Kevin Wolf | 3b8242e | 2013-12-03 16:34:41 +0100 | [diff] [blame] | 3392 | |
| 3393 | mark_request_serialising(&req, align); |
Kevin Wolf | 28de2dc | 2014-01-14 11:41:35 +0100 | [diff] [blame] | 3394 | waited = wait_serialising_requests(&req); |
| 3395 | assert(!waited || !use_local_qiov); |
Kevin Wolf | 3b8242e | 2013-12-03 16:34:41 +0100 | [diff] [blame] | 3396 | |
| 3397 | tail_buf = qemu_blockalign(bs, align); |
| 3398 | tail_iov = (struct iovec) { |
| 3399 | .iov_base = tail_buf, |
| 3400 | .iov_len = align, |
| 3401 | }; |
| 3402 | qemu_iovec_init_external(&tail_qiov, &tail_iov, 1); |
| 3403 | |
Kevin Wolf | 9e1cb96 | 2014-01-14 15:37:03 +0100 | [diff] [blame] | 3404 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV_RMW_TAIL); |
Kevin Wolf | 3b8242e | 2013-12-03 16:34:41 +0100 | [diff] [blame] | 3405 | ret = bdrv_aligned_preadv(bs, &req, (offset + bytes) & ~(align - 1), align, |
| 3406 | align, &tail_qiov, 0); |
| 3407 | if (ret < 0) { |
| 3408 | goto fail; |
| 3409 | } |
Kevin Wolf | 9e1cb96 | 2014-01-14 15:37:03 +0100 | [diff] [blame] | 3410 | BLKDBG_EVENT(bs, BLKDBG_PWRITEV_RMW_AFTER_TAIL); |
Kevin Wolf | 3b8242e | 2013-12-03 16:34:41 +0100 | [diff] [blame] | 3411 | |
| 3412 | if (!use_local_qiov) { |
| 3413 | qemu_iovec_init(&local_qiov, qiov->niov + 1); |
| 3414 | qemu_iovec_concat(&local_qiov, qiov, 0, qiov->size); |
| 3415 | use_local_qiov = true; |
| 3416 | } |
| 3417 | |
| 3418 | tail_bytes = (offset + bytes) & (align - 1); |
| 3419 | qemu_iovec_add(&local_qiov, tail_buf + tail_bytes, align - tail_bytes); |
| 3420 | |
| 3421 | bytes = ROUND_UP(bytes, align); |
| 3422 | } |
| 3423 | |
| 3424 | ret = bdrv_aligned_pwritev(bs, &req, offset, bytes, |
| 3425 | use_local_qiov ? &local_qiov : qiov, |
| 3426 | flags); |
| 3427 | |
| 3428 | fail: |
Kevin Wolf | 65afd21 | 2013-12-03 14:55:55 +0100 | [diff] [blame] | 3429 | tracked_request_end(&req); |
Kevin Wolf | b404f72 | 2013-12-03 14:02:23 +0100 | [diff] [blame] | 3430 | |
Kevin Wolf | 3b8242e | 2013-12-03 16:34:41 +0100 | [diff] [blame] | 3431 | if (use_local_qiov) { |
| 3432 | qemu_iovec_destroy(&local_qiov); |
Kevin Wolf | 3b8242e | 2013-12-03 16:34:41 +0100 | [diff] [blame] | 3433 | } |
Kevin Wolf | 99c4a85 | 2014-02-07 15:29:00 +0100 | [diff] [blame] | 3434 | qemu_vfree(head_buf); |
| 3435 | qemu_vfree(tail_buf); |
Kevin Wolf | 3b8242e | 2013-12-03 16:34:41 +0100 | [diff] [blame] | 3436 | |
Kevin Wolf | b404f72 | 2013-12-03 14:02:23 +0100 | [diff] [blame] | 3437 | return ret; |
| 3438 | } |
| 3439 | |
Kevin Wolf | 6601553 | 2013-12-03 14:40:18 +0100 | [diff] [blame] | 3440 | static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs, |
| 3441 | int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, |
| 3442 | BdrvRequestFlags flags) |
| 3443 | { |
| 3444 | if (nb_sectors < 0 || nb_sectors > (INT_MAX >> BDRV_SECTOR_BITS)) { |
| 3445 | return -EINVAL; |
| 3446 | } |
| 3447 | |
| 3448 | return bdrv_co_do_pwritev(bs, sector_num << BDRV_SECTOR_BITS, |
| 3449 | nb_sectors << BDRV_SECTOR_BITS, qiov, flags); |
| 3450 | } |
| 3451 | |
Stefan Hajnoczi | c5fbe57 | 2011-10-05 17:17:03 +0100 | [diff] [blame] | 3452 | int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num, |
| 3453 | int nb_sectors, QEMUIOVector *qiov) |
| 3454 | { |
| 3455 | trace_bdrv_co_writev(bs, sector_num, nb_sectors); |
| 3456 | |
Stefan Hajnoczi | f08f2dd | 2012-02-07 13:27:25 +0000 | [diff] [blame] | 3457 | return bdrv_co_do_writev(bs, sector_num, nb_sectors, qiov, 0); |
| 3458 | } |
| 3459 | |
| 3460 | int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs, |
Peter Lieven | aa7bfbf | 2013-10-24 12:06:51 +0200 | [diff] [blame] | 3461 | int64_t sector_num, int nb_sectors, |
| 3462 | BdrvRequestFlags flags) |
Stefan Hajnoczi | f08f2dd | 2012-02-07 13:27:25 +0000 | [diff] [blame] | 3463 | { |
Paolo Bonzini | 94d6ff2 | 2013-11-22 13:39:45 +0100 | [diff] [blame] | 3464 | trace_bdrv_co_write_zeroes(bs, sector_num, nb_sectors, flags); |
Stefan Hajnoczi | f08f2dd | 2012-02-07 13:27:25 +0000 | [diff] [blame] | 3465 | |
Peter Lieven | d32f35c | 2013-10-24 12:06:52 +0200 | [diff] [blame] | 3466 | if (!(bs->open_flags & BDRV_O_UNMAP)) { |
| 3467 | flags &= ~BDRV_REQ_MAY_UNMAP; |
| 3468 | } |
| 3469 | |
Stefan Hajnoczi | f08f2dd | 2012-02-07 13:27:25 +0000 | [diff] [blame] | 3470 | return bdrv_co_do_writev(bs, sector_num, nb_sectors, NULL, |
Peter Lieven | aa7bfbf | 2013-10-24 12:06:51 +0200 | [diff] [blame] | 3471 | BDRV_REQ_ZERO_WRITE | flags); |
Stefan Hajnoczi | c5fbe57 | 2011-10-05 17:17:03 +0100 | [diff] [blame] | 3472 | } |
| 3473 | |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 3474 | /** |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 3475 | * Truncate file to 'offset' bytes (needed only for file protocols) |
| 3476 | */ |
| 3477 | int bdrv_truncate(BlockDriverState *bs, int64_t offset) |
| 3478 | { |
| 3479 | BlockDriver *drv = bs->drv; |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 3480 | int ret; |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 3481 | if (!drv) |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 3482 | return -ENOMEDIUM; |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 3483 | if (!drv->bdrv_truncate) |
| 3484 | return -ENOTSUP; |
Naphtali Sprei | 59f2689 | 2009-10-26 16:25:16 +0200 | [diff] [blame] | 3485 | if (bs->read_only) |
| 3486 | return -EACCES; |
Jeff Cody | 9c75e16 | 2014-06-25 16:55:30 -0400 | [diff] [blame] | 3487 | |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 3488 | ret = drv->bdrv_truncate(bs, offset); |
| 3489 | if (ret == 0) { |
| 3490 | ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS); |
Markus Armbruster | 145feb1 | 2011-08-03 15:07:42 +0200 | [diff] [blame] | 3491 | bdrv_dev_resize_cb(bs); |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 3492 | } |
| 3493 | return ret; |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 3494 | } |
| 3495 | |
| 3496 | /** |
Fam Zheng | 4a1d5e1 | 2011-07-12 19:56:39 +0800 | [diff] [blame] | 3497 | * Length of a allocated file in bytes. Sparse files are counted by actual |
| 3498 | * allocated space. Return < 0 if error or unknown. |
| 3499 | */ |
| 3500 | int64_t bdrv_get_allocated_file_size(BlockDriverState *bs) |
| 3501 | { |
| 3502 | BlockDriver *drv = bs->drv; |
| 3503 | if (!drv) { |
| 3504 | return -ENOMEDIUM; |
| 3505 | } |
| 3506 | if (drv->bdrv_get_allocated_file_size) { |
| 3507 | return drv->bdrv_get_allocated_file_size(bs); |
| 3508 | } |
| 3509 | if (bs->file) { |
| 3510 | return bdrv_get_allocated_file_size(bs->file); |
| 3511 | } |
| 3512 | return -ENOTSUP; |
| 3513 | } |
| 3514 | |
| 3515 | /** |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 3516 | * Length of a file in bytes. Return < 0 if error or unknown. |
| 3517 | */ |
| 3518 | int64_t bdrv_getlength(BlockDriverState *bs) |
| 3519 | { |
| 3520 | BlockDriver *drv = bs->drv; |
| 3521 | if (!drv) |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 3522 | return -ENOMEDIUM; |
Stefan Hajnoczi | 5176228 | 2010-04-19 16:56:41 +0100 | [diff] [blame] | 3523 | |
Kevin Wolf | b94a261 | 2013-10-29 12:18:58 +0100 | [diff] [blame] | 3524 | if (drv->has_variable_length) { |
| 3525 | int ret = refresh_total_sectors(bs, bs->total_sectors); |
| 3526 | if (ret < 0) { |
| 3527 | return ret; |
Stefan Hajnoczi | 46a4e4e | 2011-03-29 20:04:41 +0100 | [diff] [blame] | 3528 | } |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 3529 | } |
Stefan Hajnoczi | 46a4e4e | 2011-03-29 20:04:41 +0100 | [diff] [blame] | 3530 | return bs->total_sectors * BDRV_SECTOR_SIZE; |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 3531 | } |
| 3532 | |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 3533 | /* return 0 as number of sectors if no device present or error */ |
ths | 96b8f13 | 2007-12-17 01:35:20 +0000 | [diff] [blame] | 3534 | void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 3535 | { |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 3536 | int64_t length; |
| 3537 | length = bdrv_getlength(bs); |
| 3538 | if (length < 0) |
| 3539 | length = 0; |
| 3540 | else |
Jan Kiszka | 6ea4430 | 2009-11-30 18:21:19 +0100 | [diff] [blame] | 3541 | length = length >> BDRV_SECTOR_BITS; |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 3542 | *nb_sectors_ptr = length; |
bellard | fc01f7e | 2003-06-30 10:03:06 +0000 | [diff] [blame] | 3543 | } |
bellard | cf98951 | 2004-02-16 21:56:36 +0000 | [diff] [blame] | 3544 | |
Paolo Bonzini | ff06f5f | 2012-09-28 17:22:54 +0200 | [diff] [blame] | 3545 | void bdrv_set_on_error(BlockDriverState *bs, BlockdevOnError on_read_error, |
| 3546 | BlockdevOnError on_write_error) |
Markus Armbruster | abd7f68 | 2010-06-02 18:55:17 +0200 | [diff] [blame] | 3547 | { |
| 3548 | bs->on_read_error = on_read_error; |
| 3549 | bs->on_write_error = on_write_error; |
| 3550 | } |
| 3551 | |
Paolo Bonzini | 1ceee0d | 2012-09-28 17:22:56 +0200 | [diff] [blame] | 3552 | BlockdevOnError bdrv_get_on_error(BlockDriverState *bs, bool is_read) |
Markus Armbruster | abd7f68 | 2010-06-02 18:55:17 +0200 | [diff] [blame] | 3553 | { |
| 3554 | return is_read ? bs->on_read_error : bs->on_write_error; |
| 3555 | } |
| 3556 | |
Paolo Bonzini | 3e1caa5 | 2012-09-28 17:22:57 +0200 | [diff] [blame] | 3557 | BlockErrorAction bdrv_get_error_action(BlockDriverState *bs, bool is_read, int error) |
| 3558 | { |
| 3559 | BlockdevOnError on_err = is_read ? bs->on_read_error : bs->on_write_error; |
| 3560 | |
| 3561 | switch (on_err) { |
| 3562 | case BLOCKDEV_ON_ERROR_ENOSPC: |
Wenchao Xia | a589569 | 2014-06-18 08:43:30 +0200 | [diff] [blame] | 3563 | return (error == ENOSPC) ? |
| 3564 | BLOCK_ERROR_ACTION_STOP : BLOCK_ERROR_ACTION_REPORT; |
Paolo Bonzini | 3e1caa5 | 2012-09-28 17:22:57 +0200 | [diff] [blame] | 3565 | case BLOCKDEV_ON_ERROR_STOP: |
Wenchao Xia | a589569 | 2014-06-18 08:43:30 +0200 | [diff] [blame] | 3566 | return BLOCK_ERROR_ACTION_STOP; |
Paolo Bonzini | 3e1caa5 | 2012-09-28 17:22:57 +0200 | [diff] [blame] | 3567 | case BLOCKDEV_ON_ERROR_REPORT: |
Wenchao Xia | a589569 | 2014-06-18 08:43:30 +0200 | [diff] [blame] | 3568 | return BLOCK_ERROR_ACTION_REPORT; |
Paolo Bonzini | 3e1caa5 | 2012-09-28 17:22:57 +0200 | [diff] [blame] | 3569 | case BLOCKDEV_ON_ERROR_IGNORE: |
Wenchao Xia | a589569 | 2014-06-18 08:43:30 +0200 | [diff] [blame] | 3570 | return BLOCK_ERROR_ACTION_IGNORE; |
Paolo Bonzini | 3e1caa5 | 2012-09-28 17:22:57 +0200 | [diff] [blame] | 3571 | default: |
| 3572 | abort(); |
| 3573 | } |
| 3574 | } |
| 3575 | |
| 3576 | /* This is done by device models because, while the block layer knows |
| 3577 | * about the error, it does not know whether an operation comes from |
| 3578 | * the device or the block layer (from a job, for example). |
| 3579 | */ |
| 3580 | void bdrv_error_action(BlockDriverState *bs, BlockErrorAction action, |
| 3581 | bool is_read, int error) |
| 3582 | { |
| 3583 | assert(error >= 0); |
Paolo Bonzini | 2bd3bce | 2014-06-05 14:53:59 +0200 | [diff] [blame] | 3584 | |
Wenchao Xia | a589569 | 2014-06-18 08:43:30 +0200 | [diff] [blame] | 3585 | if (action == BLOCK_ERROR_ACTION_STOP) { |
Paolo Bonzini | 2bd3bce | 2014-06-05 14:53:59 +0200 | [diff] [blame] | 3586 | /* First set the iostatus, so that "info block" returns an iostatus |
| 3587 | * that matches the events raised so far (an additional error iostatus |
| 3588 | * is fine, but not a lost one). |
| 3589 | */ |
Paolo Bonzini | 3e1caa5 | 2012-09-28 17:22:57 +0200 | [diff] [blame] | 3590 | bdrv_iostatus_set_err(bs, error); |
Paolo Bonzini | 2bd3bce | 2014-06-05 14:53:59 +0200 | [diff] [blame] | 3591 | |
| 3592 | /* Then raise the request to stop the VM and the event. |
| 3593 | * qemu_system_vmstop_request_prepare has two effects. First, |
| 3594 | * it ensures that the STOP event always comes after the |
| 3595 | * BLOCK_IO_ERROR event. Second, it ensures that even if management |
| 3596 | * can observe the STOP event and do a "cont" before the STOP |
| 3597 | * event is issued, the VM will not stop. In this case, vm_start() |
| 3598 | * also ensures that the STOP/RESUME pair of events is emitted. |
| 3599 | */ |
| 3600 | qemu_system_vmstop_request_prepare(); |
Wenchao Xia | 5a2d2cb | 2014-06-18 08:43:45 +0200 | [diff] [blame] | 3601 | qapi_event_send_block_io_error(bdrv_get_device_name(bs), |
| 3602 | is_read ? IO_OPERATION_TYPE_READ : |
| 3603 | IO_OPERATION_TYPE_WRITE, |
| 3604 | action, &error_abort); |
Paolo Bonzini | 2bd3bce | 2014-06-05 14:53:59 +0200 | [diff] [blame] | 3605 | qemu_system_vmstop_request(RUN_STATE_IO_ERROR); |
| 3606 | } else { |
Wenchao Xia | 5a2d2cb | 2014-06-18 08:43:45 +0200 | [diff] [blame] | 3607 | qapi_event_send_block_io_error(bdrv_get_device_name(bs), |
| 3608 | is_read ? IO_OPERATION_TYPE_READ : |
| 3609 | IO_OPERATION_TYPE_WRITE, |
| 3610 | action, &error_abort); |
Paolo Bonzini | 3e1caa5 | 2012-09-28 17:22:57 +0200 | [diff] [blame] | 3611 | } |
| 3612 | } |
| 3613 | |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 3614 | int bdrv_is_read_only(BlockDriverState *bs) |
| 3615 | { |
| 3616 | return bs->read_only; |
| 3617 | } |
| 3618 | |
ths | 985a03b | 2007-12-24 16:10:43 +0000 | [diff] [blame] | 3619 | int bdrv_is_sg(BlockDriverState *bs) |
| 3620 | { |
| 3621 | return bs->sg; |
| 3622 | } |
| 3623 | |
Christoph Hellwig | e900a7b | 2009-09-04 19:01:15 +0200 | [diff] [blame] | 3624 | int bdrv_enable_write_cache(BlockDriverState *bs) |
| 3625 | { |
| 3626 | return bs->enable_write_cache; |
| 3627 | } |
| 3628 | |
Paolo Bonzini | 425b014 | 2012-06-06 00:04:52 +0200 | [diff] [blame] | 3629 | void bdrv_set_enable_write_cache(BlockDriverState *bs, bool wce) |
| 3630 | { |
| 3631 | bs->enable_write_cache = wce; |
Jeff Cody | 55b110f | 2012-09-20 15:13:18 -0400 | [diff] [blame] | 3632 | |
| 3633 | /* so a reopen() will preserve wce */ |
| 3634 | if (wce) { |
| 3635 | bs->open_flags |= BDRV_O_CACHE_WB; |
| 3636 | } else { |
| 3637 | bs->open_flags &= ~BDRV_O_CACHE_WB; |
| 3638 | } |
Paolo Bonzini | 425b014 | 2012-06-06 00:04:52 +0200 | [diff] [blame] | 3639 | } |
| 3640 | |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 3641 | int bdrv_is_encrypted(BlockDriverState *bs) |
| 3642 | { |
| 3643 | if (bs->backing_hd && bs->backing_hd->encrypted) |
| 3644 | return 1; |
| 3645 | return bs->encrypted; |
| 3646 | } |
| 3647 | |
aliguori | c0f4ce7 | 2009-03-05 23:01:01 +0000 | [diff] [blame] | 3648 | int bdrv_key_required(BlockDriverState *bs) |
| 3649 | { |
| 3650 | BlockDriverState *backing_hd = bs->backing_hd; |
| 3651 | |
| 3652 | if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key) |
| 3653 | return 1; |
| 3654 | return (bs->encrypted && !bs->valid_key); |
| 3655 | } |
| 3656 | |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 3657 | int bdrv_set_key(BlockDriverState *bs, const char *key) |
| 3658 | { |
| 3659 | int ret; |
| 3660 | if (bs->backing_hd && bs->backing_hd->encrypted) { |
| 3661 | ret = bdrv_set_key(bs->backing_hd, key); |
| 3662 | if (ret < 0) |
| 3663 | return ret; |
| 3664 | if (!bs->encrypted) |
| 3665 | return 0; |
| 3666 | } |
Shahar Havivi | fd04a2a | 2010-03-06 00:26:13 +0200 | [diff] [blame] | 3667 | if (!bs->encrypted) { |
| 3668 | return -EINVAL; |
| 3669 | } else if (!bs->drv || !bs->drv->bdrv_set_key) { |
| 3670 | return -ENOMEDIUM; |
| 3671 | } |
aliguori | c0f4ce7 | 2009-03-05 23:01:01 +0000 | [diff] [blame] | 3672 | ret = bs->drv->bdrv_set_key(bs, key); |
aliguori | bb5fc20 | 2009-03-05 23:01:15 +0000 | [diff] [blame] | 3673 | if (ret < 0) { |
| 3674 | bs->valid_key = 0; |
| 3675 | } else if (!bs->valid_key) { |
| 3676 | bs->valid_key = 1; |
| 3677 | /* call the change callback now, we skipped it on open */ |
Markus Armbruster | 7d4b4ba | 2011-09-06 18:58:59 +0200 | [diff] [blame] | 3678 | bdrv_dev_change_media_cb(bs, true); |
aliguori | bb5fc20 | 2009-03-05 23:01:15 +0000 | [diff] [blame] | 3679 | } |
aliguori | c0f4ce7 | 2009-03-05 23:01:01 +0000 | [diff] [blame] | 3680 | return ret; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 3681 | } |
| 3682 | |
Markus Armbruster | f8d6bba | 2012-06-13 10:11:48 +0200 | [diff] [blame] | 3683 | const char *bdrv_get_format_name(BlockDriverState *bs) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 3684 | { |
Markus Armbruster | f8d6bba | 2012-06-13 10:11:48 +0200 | [diff] [blame] | 3685 | return bs->drv ? bs->drv->format_name : NULL; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 3686 | } |
| 3687 | |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 3688 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 3689 | void *opaque) |
| 3690 | { |
| 3691 | BlockDriver *drv; |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 3692 | int count = 0; |
| 3693 | const char **formats = NULL; |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 3694 | |
Stefan Hajnoczi | 8a22f02 | 2010-04-13 10:29:33 +0100 | [diff] [blame] | 3695 | QLIST_FOREACH(drv, &bdrv_drivers, list) { |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 3696 | if (drv->format_name) { |
| 3697 | bool found = false; |
| 3698 | int i = count; |
| 3699 | while (formats && i && !found) { |
| 3700 | found = !strcmp(formats[--i], drv->format_name); |
| 3701 | } |
| 3702 | |
| 3703 | if (!found) { |
| 3704 | formats = g_realloc(formats, (count + 1) * sizeof(char *)); |
| 3705 | formats[count++] = drv->format_name; |
| 3706 | it(opaque, drv->format_name); |
| 3707 | } |
| 3708 | } |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 3709 | } |
Jeff Cody | e855e4f | 2014-04-28 18:29:54 -0400 | [diff] [blame] | 3710 | g_free(formats); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 3711 | } |
| 3712 | |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 3713 | /* This function is to find block backend bs */ |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 3714 | BlockDriverState *bdrv_find(const char *name) |
| 3715 | { |
| 3716 | BlockDriverState *bs; |
| 3717 | |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 3718 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
Stefan Hajnoczi | 1b7bdbc | 2010-04-10 07:02:42 +0100 | [diff] [blame] | 3719 | if (!strcmp(name, bs->device_name)) { |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 3720 | return bs; |
Stefan Hajnoczi | 1b7bdbc | 2010-04-10 07:02:42 +0100 | [diff] [blame] | 3721 | } |
bellard | b338082 | 2004-03-14 21:38:54 +0000 | [diff] [blame] | 3722 | } |
| 3723 | return NULL; |
| 3724 | } |
| 3725 | |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 3726 | /* This function is to find a node in the bs graph */ |
| 3727 | BlockDriverState *bdrv_find_node(const char *node_name) |
| 3728 | { |
| 3729 | BlockDriverState *bs; |
| 3730 | |
| 3731 | assert(node_name); |
| 3732 | |
| 3733 | QTAILQ_FOREACH(bs, &graph_bdrv_states, node_list) { |
| 3734 | if (!strcmp(node_name, bs->node_name)) { |
| 3735 | return bs; |
| 3736 | } |
| 3737 | } |
| 3738 | return NULL; |
| 3739 | } |
| 3740 | |
Benoît Canet | c13163f | 2014-01-23 21:31:34 +0100 | [diff] [blame] | 3741 | /* Put this QMP function here so it can access the static graph_bdrv_states. */ |
| 3742 | BlockDeviceInfoList *bdrv_named_nodes_list(void) |
| 3743 | { |
| 3744 | BlockDeviceInfoList *list, *entry; |
| 3745 | BlockDriverState *bs; |
| 3746 | |
| 3747 | list = NULL; |
| 3748 | QTAILQ_FOREACH(bs, &graph_bdrv_states, node_list) { |
| 3749 | entry = g_malloc0(sizeof(*entry)); |
| 3750 | entry->value = bdrv_block_device_info(bs); |
| 3751 | entry->next = list; |
| 3752 | list = entry; |
| 3753 | } |
| 3754 | |
| 3755 | return list; |
| 3756 | } |
| 3757 | |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 3758 | BlockDriverState *bdrv_lookup_bs(const char *device, |
| 3759 | const char *node_name, |
| 3760 | Error **errp) |
| 3761 | { |
| 3762 | BlockDriverState *bs = NULL; |
| 3763 | |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 3764 | if (device) { |
| 3765 | bs = bdrv_find(device); |
| 3766 | |
Benoît Canet | dd67fa5 | 2014-02-12 17:15:06 +0100 | [diff] [blame] | 3767 | if (bs) { |
| 3768 | return bs; |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 3769 | } |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 3770 | } |
| 3771 | |
Benoît Canet | dd67fa5 | 2014-02-12 17:15:06 +0100 | [diff] [blame] | 3772 | if (node_name) { |
| 3773 | bs = bdrv_find_node(node_name); |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 3774 | |
Benoît Canet | dd67fa5 | 2014-02-12 17:15:06 +0100 | [diff] [blame] | 3775 | if (bs) { |
| 3776 | return bs; |
| 3777 | } |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 3778 | } |
| 3779 | |
Benoît Canet | dd67fa5 | 2014-02-12 17:15:06 +0100 | [diff] [blame] | 3780 | error_setg(errp, "Cannot find device=%s nor node_name=%s", |
| 3781 | device ? device : "", |
| 3782 | node_name ? node_name : ""); |
| 3783 | return NULL; |
Benoît Canet | 12d3ba8 | 2014-01-23 21:31:35 +0100 | [diff] [blame] | 3784 | } |
| 3785 | |
Markus Armbruster | 2f399b0 | 2010-06-02 18:55:20 +0200 | [diff] [blame] | 3786 | BlockDriverState *bdrv_next(BlockDriverState *bs) |
| 3787 | { |
| 3788 | if (!bs) { |
| 3789 | return QTAILQ_FIRST(&bdrv_states); |
| 3790 | } |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 3791 | return QTAILQ_NEXT(bs, device_list); |
Markus Armbruster | 2f399b0 | 2010-06-02 18:55:20 +0200 | [diff] [blame] | 3792 | } |
| 3793 | |
aliguori | 51de976 | 2009-03-05 23:00:43 +0000 | [diff] [blame] | 3794 | void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) |
bellard | 81d0912 | 2004-07-14 17:21:37 +0000 | [diff] [blame] | 3795 | { |
| 3796 | BlockDriverState *bs; |
| 3797 | |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 3798 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
aliguori | 51de976 | 2009-03-05 23:00:43 +0000 | [diff] [blame] | 3799 | it(opaque, bs); |
bellard | 81d0912 | 2004-07-14 17:21:37 +0000 | [diff] [blame] | 3800 | } |
| 3801 | } |
| 3802 | |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 3803 | const char *bdrv_get_device_name(BlockDriverState *bs) |
| 3804 | { |
| 3805 | return bs->device_name; |
| 3806 | } |
| 3807 | |
Markus Armbruster | c843328 | 2012-06-05 16:49:24 +0200 | [diff] [blame] | 3808 | int bdrv_get_flags(BlockDriverState *bs) |
| 3809 | { |
| 3810 | return bs->open_flags; |
| 3811 | } |
| 3812 | |
Kevin Wolf | f0f0fdf | 2013-07-05 13:48:01 +0200 | [diff] [blame] | 3813 | int bdrv_flush_all(void) |
aliguori | c6ca28d | 2008-10-06 13:55:43 +0000 | [diff] [blame] | 3814 | { |
| 3815 | BlockDriverState *bs; |
Kevin Wolf | f0f0fdf | 2013-07-05 13:48:01 +0200 | [diff] [blame] | 3816 | int result = 0; |
aliguori | c6ca28d | 2008-10-06 13:55:43 +0000 | [diff] [blame] | 3817 | |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 3818 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
Stefan Hajnoczi | ed78cda | 2014-05-08 16:34:35 +0200 | [diff] [blame] | 3819 | AioContext *aio_context = bdrv_get_aio_context(bs); |
| 3820 | int ret; |
| 3821 | |
| 3822 | aio_context_acquire(aio_context); |
| 3823 | ret = bdrv_flush(bs); |
Kevin Wolf | f0f0fdf | 2013-07-05 13:48:01 +0200 | [diff] [blame] | 3824 | if (ret < 0 && !result) { |
| 3825 | result = ret; |
| 3826 | } |
Stefan Hajnoczi | ed78cda | 2014-05-08 16:34:35 +0200 | [diff] [blame] | 3827 | aio_context_release(aio_context); |
Stefan Hajnoczi | 1b7bdbc | 2010-04-10 07:02:42 +0100 | [diff] [blame] | 3828 | } |
Kevin Wolf | f0f0fdf | 2013-07-05 13:48:01 +0200 | [diff] [blame] | 3829 | |
| 3830 | return result; |
aliguori | c6ca28d | 2008-10-06 13:55:43 +0000 | [diff] [blame] | 3831 | } |
| 3832 | |
Peter Lieven | 3ac2162 | 2013-06-28 12:47:42 +0200 | [diff] [blame] | 3833 | int bdrv_has_zero_init_1(BlockDriverState *bs) |
| 3834 | { |
| 3835 | return 1; |
| 3836 | } |
| 3837 | |
Kevin Wolf | f2feebb | 2010-04-14 17:30:35 +0200 | [diff] [blame] | 3838 | int bdrv_has_zero_init(BlockDriverState *bs) |
| 3839 | { |
| 3840 | assert(bs->drv); |
| 3841 | |
Paolo Bonzini | 11212d8 | 2013-09-04 19:00:27 +0200 | [diff] [blame] | 3842 | /* If BS is a copy on write image, it is initialized to |
| 3843 | the contents of the base image, which may not be zeroes. */ |
| 3844 | if (bs->backing_hd) { |
| 3845 | return 0; |
| 3846 | } |
Kevin Wolf | 336c1c1 | 2010-07-28 11:26:29 +0200 | [diff] [blame] | 3847 | if (bs->drv->bdrv_has_zero_init) { |
| 3848 | return bs->drv->bdrv_has_zero_init(bs); |
Kevin Wolf | f2feebb | 2010-04-14 17:30:35 +0200 | [diff] [blame] | 3849 | } |
| 3850 | |
Peter Lieven | 3ac2162 | 2013-06-28 12:47:42 +0200 | [diff] [blame] | 3851 | /* safe default */ |
| 3852 | return 0; |
Kevin Wolf | f2feebb | 2010-04-14 17:30:35 +0200 | [diff] [blame] | 3853 | } |
| 3854 | |
Peter Lieven | 4ce7869 | 2013-10-24 12:06:54 +0200 | [diff] [blame] | 3855 | bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs) |
| 3856 | { |
| 3857 | BlockDriverInfo bdi; |
| 3858 | |
| 3859 | if (bs->backing_hd) { |
| 3860 | return false; |
| 3861 | } |
| 3862 | |
| 3863 | if (bdrv_get_info(bs, &bdi) == 0) { |
| 3864 | return bdi.unallocated_blocks_are_zero; |
| 3865 | } |
| 3866 | |
| 3867 | return false; |
| 3868 | } |
| 3869 | |
| 3870 | bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs) |
| 3871 | { |
| 3872 | BlockDriverInfo bdi; |
| 3873 | |
| 3874 | if (bs->backing_hd || !(bs->open_flags & BDRV_O_UNMAP)) { |
| 3875 | return false; |
| 3876 | } |
| 3877 | |
| 3878 | if (bdrv_get_info(bs, &bdi) == 0) { |
| 3879 | return bdi.can_write_zeroes_with_unmap; |
| 3880 | } |
| 3881 | |
| 3882 | return false; |
| 3883 | } |
| 3884 | |
Paolo Bonzini | b6b8a33 | 2013-09-04 19:00:28 +0200 | [diff] [blame] | 3885 | typedef struct BdrvCoGetBlockStatusData { |
Stefan Hajnoczi | 376ae3f | 2011-11-14 12:44:19 +0000 | [diff] [blame] | 3886 | BlockDriverState *bs; |
Miroslav Rezanina | b35b2bb | 2013-02-13 09:09:39 +0100 | [diff] [blame] | 3887 | BlockDriverState *base; |
Stefan Hajnoczi | 376ae3f | 2011-11-14 12:44:19 +0000 | [diff] [blame] | 3888 | int64_t sector_num; |
| 3889 | int nb_sectors; |
| 3890 | int *pnum; |
Paolo Bonzini | b6b8a33 | 2013-09-04 19:00:28 +0200 | [diff] [blame] | 3891 | int64_t ret; |
Stefan Hajnoczi | 376ae3f | 2011-11-14 12:44:19 +0000 | [diff] [blame] | 3892 | bool done; |
Paolo Bonzini | b6b8a33 | 2013-09-04 19:00:28 +0200 | [diff] [blame] | 3893 | } BdrvCoGetBlockStatusData; |
Stefan Hajnoczi | 376ae3f | 2011-11-14 12:44:19 +0000 | [diff] [blame] | 3894 | |
ths | f58c7b3 | 2008-06-05 21:53:49 +0000 | [diff] [blame] | 3895 | /* |
| 3896 | * Returns true iff the specified sector is present in the disk image. Drivers |
| 3897 | * not implementing the functionality are assumed to not support backing files, |
| 3898 | * hence all their sectors are reported as allocated. |
| 3899 | * |
Stefan Hajnoczi | bd9533e | 2011-11-29 13:49:51 +0000 | [diff] [blame] | 3900 | * If 'sector_num' is beyond the end of the disk image the return value is 0 |
| 3901 | * and 'pnum' is set to 0. |
| 3902 | * |
ths | f58c7b3 | 2008-06-05 21:53:49 +0000 | [diff] [blame] | 3903 | * 'pnum' is set to the number of sectors (including and immediately following |
| 3904 | * the specified sector) that are known to be in the same |
| 3905 | * allocated/unallocated state. |
| 3906 | * |
Stefan Hajnoczi | bd9533e | 2011-11-29 13:49:51 +0000 | [diff] [blame] | 3907 | * 'nb_sectors' is the max value 'pnum' should be set to. If nb_sectors goes |
| 3908 | * beyond the end of the disk image it will be clamped. |
ths | f58c7b3 | 2008-06-05 21:53:49 +0000 | [diff] [blame] | 3909 | */ |
Paolo Bonzini | b6b8a33 | 2013-09-04 19:00:28 +0200 | [diff] [blame] | 3910 | static int64_t coroutine_fn bdrv_co_get_block_status(BlockDriverState *bs, |
| 3911 | int64_t sector_num, |
| 3912 | int nb_sectors, int *pnum) |
ths | f58c7b3 | 2008-06-05 21:53:49 +0000 | [diff] [blame] | 3913 | { |
Paolo Bonzini | 617ccb4 | 2013-09-04 19:00:23 +0200 | [diff] [blame] | 3914 | int64_t length; |
Stefan Hajnoczi | bd9533e | 2011-11-29 13:49:51 +0000 | [diff] [blame] | 3915 | int64_t n; |
Paolo Bonzini | 5daa74a | 2013-09-04 19:00:38 +0200 | [diff] [blame] | 3916 | int64_t ret, ret2; |
Stefan Hajnoczi | bd9533e | 2011-11-29 13:49:51 +0000 | [diff] [blame] | 3917 | |
Paolo Bonzini | 617ccb4 | 2013-09-04 19:00:23 +0200 | [diff] [blame] | 3918 | length = bdrv_getlength(bs); |
| 3919 | if (length < 0) { |
| 3920 | return length; |
| 3921 | } |
| 3922 | |
| 3923 | if (sector_num >= (length >> BDRV_SECTOR_BITS)) { |
Stefan Hajnoczi | bd9533e | 2011-11-29 13:49:51 +0000 | [diff] [blame] | 3924 | *pnum = 0; |
| 3925 | return 0; |
| 3926 | } |
| 3927 | |
| 3928 | n = bs->total_sectors - sector_num; |
| 3929 | if (n < nb_sectors) { |
| 3930 | nb_sectors = n; |
| 3931 | } |
| 3932 | |
Paolo Bonzini | b6b8a33 | 2013-09-04 19:00:28 +0200 | [diff] [blame] | 3933 | if (!bs->drv->bdrv_co_get_block_status) { |
Stefan Hajnoczi | bd9533e | 2011-11-29 13:49:51 +0000 | [diff] [blame] | 3934 | *pnum = nb_sectors; |
Kevin Wolf | e88ae22 | 2014-05-06 15:25:36 +0200 | [diff] [blame] | 3935 | ret = BDRV_BLOCK_DATA | BDRV_BLOCK_ALLOCATED; |
Paolo Bonzini | 918e92d | 2013-09-04 19:00:37 +0200 | [diff] [blame] | 3936 | if (bs->drv->protocol_name) { |
| 3937 | ret |= BDRV_BLOCK_OFFSET_VALID | (sector_num * BDRV_SECTOR_SIZE); |
| 3938 | } |
| 3939 | return ret; |
ths | f58c7b3 | 2008-06-05 21:53:49 +0000 | [diff] [blame] | 3940 | } |
Stefan Hajnoczi | 6aebab1 | 2011-11-14 12:44:25 +0000 | [diff] [blame] | 3941 | |
Paolo Bonzini | 415b5b0 | 2013-09-04 19:00:31 +0200 | [diff] [blame] | 3942 | ret = bs->drv->bdrv_co_get_block_status(bs, sector_num, nb_sectors, pnum); |
| 3943 | if (ret < 0) { |
Peter Lieven | 3e0a233 | 2013-09-24 15:35:08 +0200 | [diff] [blame] | 3944 | *pnum = 0; |
Paolo Bonzini | 415b5b0 | 2013-09-04 19:00:31 +0200 | [diff] [blame] | 3945 | return ret; |
| 3946 | } |
| 3947 | |
Peter Lieven | 92bc50a | 2013-10-08 14:43:14 +0200 | [diff] [blame] | 3948 | if (ret & BDRV_BLOCK_RAW) { |
| 3949 | assert(ret & BDRV_BLOCK_OFFSET_VALID); |
| 3950 | return bdrv_get_block_status(bs->file, ret >> BDRV_SECTOR_BITS, |
| 3951 | *pnum, pnum); |
| 3952 | } |
| 3953 | |
Kevin Wolf | e88ae22 | 2014-05-06 15:25:36 +0200 | [diff] [blame] | 3954 | if (ret & (BDRV_BLOCK_DATA | BDRV_BLOCK_ZERO)) { |
| 3955 | ret |= BDRV_BLOCK_ALLOCATED; |
| 3956 | } |
| 3957 | |
Peter Lieven | c3d8688 | 2013-10-24 12:07:04 +0200 | [diff] [blame] | 3958 | if (!(ret & BDRV_BLOCK_DATA) && !(ret & BDRV_BLOCK_ZERO)) { |
| 3959 | if (bdrv_unallocated_blocks_are_zero(bs)) { |
Paolo Bonzini | f0ad571 | 2013-09-04 19:00:32 +0200 | [diff] [blame] | 3960 | ret |= BDRV_BLOCK_ZERO; |
Peter Lieven | 1f9db22 | 2013-09-24 15:35:09 +0200 | [diff] [blame] | 3961 | } else if (bs->backing_hd) { |
Paolo Bonzini | f0ad571 | 2013-09-04 19:00:32 +0200 | [diff] [blame] | 3962 | BlockDriverState *bs2 = bs->backing_hd; |
| 3963 | int64_t length2 = bdrv_getlength(bs2); |
| 3964 | if (length2 >= 0 && sector_num >= (length2 >> BDRV_SECTOR_BITS)) { |
| 3965 | ret |= BDRV_BLOCK_ZERO; |
| 3966 | } |
| 3967 | } |
Paolo Bonzini | 415b5b0 | 2013-09-04 19:00:31 +0200 | [diff] [blame] | 3968 | } |
Paolo Bonzini | 5daa74a | 2013-09-04 19:00:38 +0200 | [diff] [blame] | 3969 | |
| 3970 | if (bs->file && |
| 3971 | (ret & BDRV_BLOCK_DATA) && !(ret & BDRV_BLOCK_ZERO) && |
| 3972 | (ret & BDRV_BLOCK_OFFSET_VALID)) { |
| 3973 | ret2 = bdrv_co_get_block_status(bs->file, ret >> BDRV_SECTOR_BITS, |
| 3974 | *pnum, pnum); |
| 3975 | if (ret2 >= 0) { |
| 3976 | /* Ignore errors. This is just providing extra information, it |
| 3977 | * is useful but not necessary. |
| 3978 | */ |
| 3979 | ret |= (ret2 & BDRV_BLOCK_ZERO); |
| 3980 | } |
| 3981 | } |
| 3982 | |
Paolo Bonzini | 415b5b0 | 2013-09-04 19:00:31 +0200 | [diff] [blame] | 3983 | return ret; |
Stefan Hajnoczi | 060f51c | 2011-11-14 12:44:26 +0000 | [diff] [blame] | 3984 | } |
| 3985 | |
Paolo Bonzini | b6b8a33 | 2013-09-04 19:00:28 +0200 | [diff] [blame] | 3986 | /* Coroutine wrapper for bdrv_get_block_status() */ |
| 3987 | static void coroutine_fn bdrv_get_block_status_co_entry(void *opaque) |
Stefan Hajnoczi | 060f51c | 2011-11-14 12:44:26 +0000 | [diff] [blame] | 3988 | { |
Paolo Bonzini | b6b8a33 | 2013-09-04 19:00:28 +0200 | [diff] [blame] | 3989 | BdrvCoGetBlockStatusData *data = opaque; |
Stefan Hajnoczi | 060f51c | 2011-11-14 12:44:26 +0000 | [diff] [blame] | 3990 | BlockDriverState *bs = data->bs; |
| 3991 | |
Paolo Bonzini | b6b8a33 | 2013-09-04 19:00:28 +0200 | [diff] [blame] | 3992 | data->ret = bdrv_co_get_block_status(bs, data->sector_num, data->nb_sectors, |
| 3993 | data->pnum); |
Stefan Hajnoczi | 060f51c | 2011-11-14 12:44:26 +0000 | [diff] [blame] | 3994 | data->done = true; |
| 3995 | } |
| 3996 | |
| 3997 | /* |
Paolo Bonzini | b6b8a33 | 2013-09-04 19:00:28 +0200 | [diff] [blame] | 3998 | * Synchronous wrapper around bdrv_co_get_block_status(). |
Stefan Hajnoczi | 060f51c | 2011-11-14 12:44:26 +0000 | [diff] [blame] | 3999 | * |
Paolo Bonzini | b6b8a33 | 2013-09-04 19:00:28 +0200 | [diff] [blame] | 4000 | * See bdrv_co_get_block_status() for details. |
Stefan Hajnoczi | 060f51c | 2011-11-14 12:44:26 +0000 | [diff] [blame] | 4001 | */ |
Paolo Bonzini | b6b8a33 | 2013-09-04 19:00:28 +0200 | [diff] [blame] | 4002 | int64_t bdrv_get_block_status(BlockDriverState *bs, int64_t sector_num, |
| 4003 | int nb_sectors, int *pnum) |
Stefan Hajnoczi | 060f51c | 2011-11-14 12:44:26 +0000 | [diff] [blame] | 4004 | { |
Stefan Hajnoczi | 6aebab1 | 2011-11-14 12:44:25 +0000 | [diff] [blame] | 4005 | Coroutine *co; |
Paolo Bonzini | b6b8a33 | 2013-09-04 19:00:28 +0200 | [diff] [blame] | 4006 | BdrvCoGetBlockStatusData data = { |
Stefan Hajnoczi | 6aebab1 | 2011-11-14 12:44:25 +0000 | [diff] [blame] | 4007 | .bs = bs, |
| 4008 | .sector_num = sector_num, |
| 4009 | .nb_sectors = nb_sectors, |
| 4010 | .pnum = pnum, |
| 4011 | .done = false, |
| 4012 | }; |
| 4013 | |
Paolo Bonzini | bdad13b | 2013-09-04 19:00:22 +0200 | [diff] [blame] | 4014 | if (qemu_in_coroutine()) { |
| 4015 | /* Fast-path if already in coroutine context */ |
Paolo Bonzini | b6b8a33 | 2013-09-04 19:00:28 +0200 | [diff] [blame] | 4016 | bdrv_get_block_status_co_entry(&data); |
Paolo Bonzini | bdad13b | 2013-09-04 19:00:22 +0200 | [diff] [blame] | 4017 | } else { |
Stefan Hajnoczi | 2572b37 | 2014-05-08 16:34:34 +0200 | [diff] [blame] | 4018 | AioContext *aio_context = bdrv_get_aio_context(bs); |
| 4019 | |
Paolo Bonzini | b6b8a33 | 2013-09-04 19:00:28 +0200 | [diff] [blame] | 4020 | co = qemu_coroutine_create(bdrv_get_block_status_co_entry); |
Paolo Bonzini | bdad13b | 2013-09-04 19:00:22 +0200 | [diff] [blame] | 4021 | qemu_coroutine_enter(co, &data); |
| 4022 | while (!data.done) { |
Stefan Hajnoczi | 2572b37 | 2014-05-08 16:34:34 +0200 | [diff] [blame] | 4023 | aio_poll(aio_context, true); |
Paolo Bonzini | bdad13b | 2013-09-04 19:00:22 +0200 | [diff] [blame] | 4024 | } |
Stefan Hajnoczi | 6aebab1 | 2011-11-14 12:44:25 +0000 | [diff] [blame] | 4025 | } |
| 4026 | return data.ret; |
ths | f58c7b3 | 2008-06-05 21:53:49 +0000 | [diff] [blame] | 4027 | } |
| 4028 | |
Paolo Bonzini | b6b8a33 | 2013-09-04 19:00:28 +0200 | [diff] [blame] | 4029 | int coroutine_fn bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, |
| 4030 | int nb_sectors, int *pnum) |
| 4031 | { |
Paolo Bonzini | 4333bb7 | 2013-09-04 19:00:29 +0200 | [diff] [blame] | 4032 | int64_t ret = bdrv_get_block_status(bs, sector_num, nb_sectors, pnum); |
| 4033 | if (ret < 0) { |
| 4034 | return ret; |
| 4035 | } |
Kevin Wolf | e88ae22 | 2014-05-06 15:25:36 +0200 | [diff] [blame] | 4036 | return (ret & BDRV_BLOCK_ALLOCATED); |
Paolo Bonzini | b6b8a33 | 2013-09-04 19:00:28 +0200 | [diff] [blame] | 4037 | } |
| 4038 | |
Paolo Bonzini | 188a7bb | 2012-05-08 16:52:01 +0200 | [diff] [blame] | 4039 | /* |
| 4040 | * Given an image chain: ... -> [BASE] -> [INTER1] -> [INTER2] -> [TOP] |
| 4041 | * |
| 4042 | * Return true if the given sector is allocated in any image between |
| 4043 | * BASE and TOP (inclusive). BASE can be NULL to check if the given |
| 4044 | * sector is allocated in any image of the chain. Return false otherwise. |
| 4045 | * |
| 4046 | * 'pnum' is set to the number of sectors (including and immediately following |
| 4047 | * the specified sector) that are known to be in the same |
| 4048 | * allocated/unallocated state. |
| 4049 | * |
| 4050 | */ |
Paolo Bonzini | 4f57863 | 2013-09-04 19:00:24 +0200 | [diff] [blame] | 4051 | int bdrv_is_allocated_above(BlockDriverState *top, |
| 4052 | BlockDriverState *base, |
| 4053 | int64_t sector_num, |
| 4054 | int nb_sectors, int *pnum) |
Paolo Bonzini | 188a7bb | 2012-05-08 16:52:01 +0200 | [diff] [blame] | 4055 | { |
| 4056 | BlockDriverState *intermediate; |
| 4057 | int ret, n = nb_sectors; |
| 4058 | |
| 4059 | intermediate = top; |
| 4060 | while (intermediate && intermediate != base) { |
| 4061 | int pnum_inter; |
Paolo Bonzini | bdad13b | 2013-09-04 19:00:22 +0200 | [diff] [blame] | 4062 | ret = bdrv_is_allocated(intermediate, sector_num, nb_sectors, |
| 4063 | &pnum_inter); |
Paolo Bonzini | 188a7bb | 2012-05-08 16:52:01 +0200 | [diff] [blame] | 4064 | if (ret < 0) { |
| 4065 | return ret; |
| 4066 | } else if (ret) { |
| 4067 | *pnum = pnum_inter; |
| 4068 | return 1; |
| 4069 | } |
| 4070 | |
| 4071 | /* |
| 4072 | * [sector_num, nb_sectors] is unallocated on top but intermediate |
| 4073 | * might have |
| 4074 | * |
| 4075 | * [sector_num+x, nr_sectors] allocated. |
| 4076 | */ |
Vishvananda Ishaya | 63ba17d | 2013-01-24 10:02:08 -0800 | [diff] [blame] | 4077 | if (n > pnum_inter && |
| 4078 | (intermediate == top || |
| 4079 | sector_num + pnum_inter < intermediate->total_sectors)) { |
Paolo Bonzini | 188a7bb | 2012-05-08 16:52:01 +0200 | [diff] [blame] | 4080 | n = pnum_inter; |
| 4081 | } |
| 4082 | |
| 4083 | intermediate = intermediate->backing_hd; |
| 4084 | } |
| 4085 | |
| 4086 | *pnum = n; |
| 4087 | return 0; |
| 4088 | } |
| 4089 | |
aliguori | 045df33 | 2009-03-05 23:00:48 +0000 | [diff] [blame] | 4090 | const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
| 4091 | { |
| 4092 | if (bs->backing_hd && bs->backing_hd->encrypted) |
| 4093 | return bs->backing_file; |
| 4094 | else if (bs->encrypted) |
| 4095 | return bs->filename; |
| 4096 | else |
| 4097 | return NULL; |
| 4098 | } |
| 4099 | |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 4100 | void bdrv_get_backing_filename(BlockDriverState *bs, |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 4101 | char *filename, int filename_size) |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 4102 | { |
Kevin Wolf | 3574c60 | 2011-10-26 11:02:11 +0200 | [diff] [blame] | 4103 | pstrcpy(filename, filename_size, bs->backing_file); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 4104 | } |
| 4105 | |
ths | 5fafdf2 | 2007-09-16 21:08:06 +0000 | [diff] [blame] | 4106 | int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, |
bellard | faea38e | 2006-08-05 21:31:00 +0000 | [diff] [blame] | 4107 | const uint8_t *buf, int nb_sectors) |
| 4108 | { |
| 4109 | BlockDriver *drv = bs->drv; |
| 4110 | if (!drv) |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 4111 | return -ENOMEDIUM; |
bellard | faea38e | 2006-08-05 21:31:00 +0000 | [diff] [blame] | 4112 | if (!drv->bdrv_write_compressed) |
| 4113 | return -ENOTSUP; |
Kevin Wolf | fbb7b4e | 2009-05-08 14:47:24 +0200 | [diff] [blame] | 4114 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
| 4115 | return -EIO; |
Jan Kiszka | a55eb92 | 2009-11-30 18:21:19 +0100 | [diff] [blame] | 4116 | |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 4117 | assert(QLIST_EMPTY(&bs->dirty_bitmaps)); |
Jan Kiszka | a55eb92 | 2009-11-30 18:21:19 +0100 | [diff] [blame] | 4118 | |
bellard | faea38e | 2006-08-05 21:31:00 +0000 | [diff] [blame] | 4119 | return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); |
| 4120 | } |
ths | 3b46e62 | 2007-09-17 08:09:54 +0000 | [diff] [blame] | 4121 | |
bellard | faea38e | 2006-08-05 21:31:00 +0000 | [diff] [blame] | 4122 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
| 4123 | { |
| 4124 | BlockDriver *drv = bs->drv; |
| 4125 | if (!drv) |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 4126 | return -ENOMEDIUM; |
bellard | faea38e | 2006-08-05 21:31:00 +0000 | [diff] [blame] | 4127 | if (!drv->bdrv_get_info) |
| 4128 | return -ENOTSUP; |
| 4129 | memset(bdi, 0, sizeof(*bdi)); |
| 4130 | return drv->bdrv_get_info(bs, bdi); |
| 4131 | } |
| 4132 | |
Max Reitz | eae041f | 2013-10-09 10:46:16 +0200 | [diff] [blame] | 4133 | ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs) |
| 4134 | { |
| 4135 | BlockDriver *drv = bs->drv; |
| 4136 | if (drv && drv->bdrv_get_specific_info) { |
| 4137 | return drv->bdrv_get_specific_info(bs); |
| 4138 | } |
| 4139 | return NULL; |
| 4140 | } |
| 4141 | |
Christoph Hellwig | 45566e9 | 2009-07-10 23:11:57 +0200 | [diff] [blame] | 4142 | int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
| 4143 | int64_t pos, int size) |
aliguori | 178e08a | 2009-04-05 19:10:55 +0000 | [diff] [blame] | 4144 | { |
Kevin Wolf | cf8074b | 2013-04-05 21:27:53 +0200 | [diff] [blame] | 4145 | QEMUIOVector qiov; |
| 4146 | struct iovec iov = { |
| 4147 | .iov_base = (void *) buf, |
| 4148 | .iov_len = size, |
| 4149 | }; |
| 4150 | |
| 4151 | qemu_iovec_init_external(&qiov, &iov, 1); |
| 4152 | return bdrv_writev_vmstate(bs, &qiov, pos); |
| 4153 | } |
| 4154 | |
| 4155 | int bdrv_writev_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos) |
| 4156 | { |
aliguori | 178e08a | 2009-04-05 19:10:55 +0000 | [diff] [blame] | 4157 | BlockDriver *drv = bs->drv; |
Kevin Wolf | cf8074b | 2013-04-05 21:27:53 +0200 | [diff] [blame] | 4158 | |
| 4159 | if (!drv) { |
aliguori | 178e08a | 2009-04-05 19:10:55 +0000 | [diff] [blame] | 4160 | return -ENOMEDIUM; |
Kevin Wolf | cf8074b | 2013-04-05 21:27:53 +0200 | [diff] [blame] | 4161 | } else if (drv->bdrv_save_vmstate) { |
| 4162 | return drv->bdrv_save_vmstate(bs, qiov, pos); |
| 4163 | } else if (bs->file) { |
| 4164 | return bdrv_writev_vmstate(bs->file, qiov, pos); |
| 4165 | } |
| 4166 | |
MORITA Kazutaka | 7cdb1f6 | 2010-05-28 11:44:58 +0900 | [diff] [blame] | 4167 | return -ENOTSUP; |
aliguori | 178e08a | 2009-04-05 19:10:55 +0000 | [diff] [blame] | 4168 | } |
| 4169 | |
Christoph Hellwig | 45566e9 | 2009-07-10 23:11:57 +0200 | [diff] [blame] | 4170 | int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
| 4171 | int64_t pos, int size) |
aliguori | 178e08a | 2009-04-05 19:10:55 +0000 | [diff] [blame] | 4172 | { |
| 4173 | BlockDriver *drv = bs->drv; |
| 4174 | if (!drv) |
| 4175 | return -ENOMEDIUM; |
MORITA Kazutaka | 7cdb1f6 | 2010-05-28 11:44:58 +0900 | [diff] [blame] | 4176 | if (drv->bdrv_load_vmstate) |
| 4177 | return drv->bdrv_load_vmstate(bs, buf, pos, size); |
| 4178 | if (bs->file) |
| 4179 | return bdrv_load_vmstate(bs->file, buf, pos, size); |
| 4180 | return -ENOTSUP; |
aliguori | 178e08a | 2009-04-05 19:10:55 +0000 | [diff] [blame] | 4181 | } |
| 4182 | |
Kevin Wolf | 8b9b0cc | 2010-03-15 17:27:00 +0100 | [diff] [blame] | 4183 | void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event) |
| 4184 | { |
Kevin Wolf | bf736fe | 2013-06-05 15:17:55 +0200 | [diff] [blame] | 4185 | if (!bs || !bs->drv || !bs->drv->bdrv_debug_event) { |
Kevin Wolf | 8b9b0cc | 2010-03-15 17:27:00 +0100 | [diff] [blame] | 4186 | return; |
| 4187 | } |
| 4188 | |
Kevin Wolf | bf736fe | 2013-06-05 15:17:55 +0200 | [diff] [blame] | 4189 | bs->drv->bdrv_debug_event(bs, event); |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 4190 | } |
Kevin Wolf | 8b9b0cc | 2010-03-15 17:27:00 +0100 | [diff] [blame] | 4191 | |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 4192 | int bdrv_debug_breakpoint(BlockDriverState *bs, const char *event, |
| 4193 | const char *tag) |
| 4194 | { |
| 4195 | while (bs && bs->drv && !bs->drv->bdrv_debug_breakpoint) { |
| 4196 | bs = bs->file; |
| 4197 | } |
| 4198 | |
| 4199 | if (bs && bs->drv && bs->drv->bdrv_debug_breakpoint) { |
| 4200 | return bs->drv->bdrv_debug_breakpoint(bs, event, tag); |
| 4201 | } |
| 4202 | |
| 4203 | return -ENOTSUP; |
| 4204 | } |
| 4205 | |
Fam Zheng | 4cc70e9 | 2013-11-20 10:01:54 +0800 | [diff] [blame] | 4206 | int bdrv_debug_remove_breakpoint(BlockDriverState *bs, const char *tag) |
| 4207 | { |
| 4208 | while (bs && bs->drv && !bs->drv->bdrv_debug_remove_breakpoint) { |
| 4209 | bs = bs->file; |
| 4210 | } |
| 4211 | |
| 4212 | if (bs && bs->drv && bs->drv->bdrv_debug_remove_breakpoint) { |
| 4213 | return bs->drv->bdrv_debug_remove_breakpoint(bs, tag); |
| 4214 | } |
| 4215 | |
| 4216 | return -ENOTSUP; |
| 4217 | } |
| 4218 | |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 4219 | int bdrv_debug_resume(BlockDriverState *bs, const char *tag) |
| 4220 | { |
Max Reitz | 938789e | 2014-03-10 23:44:08 +0100 | [diff] [blame] | 4221 | while (bs && (!bs->drv || !bs->drv->bdrv_debug_resume)) { |
Kevin Wolf | 41c695c | 2012-12-06 14:32:58 +0100 | [diff] [blame] | 4222 | bs = bs->file; |
| 4223 | } |
| 4224 | |
| 4225 | if (bs && bs->drv && bs->drv->bdrv_debug_resume) { |
| 4226 | return bs->drv->bdrv_debug_resume(bs, tag); |
| 4227 | } |
| 4228 | |
| 4229 | return -ENOTSUP; |
| 4230 | } |
| 4231 | |
| 4232 | bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag) |
| 4233 | { |
| 4234 | while (bs && bs->drv && !bs->drv->bdrv_debug_is_suspended) { |
| 4235 | bs = bs->file; |
| 4236 | } |
| 4237 | |
| 4238 | if (bs && bs->drv && bs->drv->bdrv_debug_is_suspended) { |
| 4239 | return bs->drv->bdrv_debug_is_suspended(bs, tag); |
| 4240 | } |
| 4241 | |
| 4242 | return false; |
Kevin Wolf | 8b9b0cc | 2010-03-15 17:27:00 +0100 | [diff] [blame] | 4243 | } |
| 4244 | |
Blue Swirl | 199630b | 2010-07-25 20:49:34 +0000 | [diff] [blame] | 4245 | int bdrv_is_snapshot(BlockDriverState *bs) |
| 4246 | { |
| 4247 | return !!(bs->open_flags & BDRV_O_SNAPSHOT); |
| 4248 | } |
| 4249 | |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 4250 | /* backing_file can either be relative, or absolute, or a protocol. If it is |
| 4251 | * relative, it must be relative to the chain. So, passing in bs->filename |
| 4252 | * from a BDS as backing_file should not be done, as that may be relative to |
| 4253 | * the CWD rather than the chain. */ |
Marcelo Tosatti | e8a6bb9 | 2012-01-18 14:40:51 +0000 | [diff] [blame] | 4254 | BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, |
| 4255 | const char *backing_file) |
| 4256 | { |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 4257 | char *filename_full = NULL; |
| 4258 | char *backing_file_full = NULL; |
| 4259 | char *filename_tmp = NULL; |
| 4260 | int is_protocol = 0; |
| 4261 | BlockDriverState *curr_bs = NULL; |
| 4262 | BlockDriverState *retval = NULL; |
| 4263 | |
| 4264 | if (!bs || !bs->drv || !backing_file) { |
Marcelo Tosatti | e8a6bb9 | 2012-01-18 14:40:51 +0000 | [diff] [blame] | 4265 | return NULL; |
| 4266 | } |
| 4267 | |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 4268 | filename_full = g_malloc(PATH_MAX); |
| 4269 | backing_file_full = g_malloc(PATH_MAX); |
| 4270 | filename_tmp = g_malloc(PATH_MAX); |
| 4271 | |
| 4272 | is_protocol = path_has_protocol(backing_file); |
| 4273 | |
| 4274 | for (curr_bs = bs; curr_bs->backing_hd; curr_bs = curr_bs->backing_hd) { |
| 4275 | |
| 4276 | /* If either of the filename paths is actually a protocol, then |
| 4277 | * compare unmodified paths; otherwise make paths relative */ |
| 4278 | if (is_protocol || path_has_protocol(curr_bs->backing_file)) { |
| 4279 | if (strcmp(backing_file, curr_bs->backing_file) == 0) { |
| 4280 | retval = curr_bs->backing_hd; |
| 4281 | break; |
| 4282 | } |
Marcelo Tosatti | e8a6bb9 | 2012-01-18 14:40:51 +0000 | [diff] [blame] | 4283 | } else { |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 4284 | /* If not an absolute filename path, make it relative to the current |
| 4285 | * image's filename path */ |
| 4286 | path_combine(filename_tmp, PATH_MAX, curr_bs->filename, |
| 4287 | backing_file); |
| 4288 | |
| 4289 | /* We are going to compare absolute pathnames */ |
| 4290 | if (!realpath(filename_tmp, filename_full)) { |
| 4291 | continue; |
| 4292 | } |
| 4293 | |
| 4294 | /* We need to make sure the backing filename we are comparing against |
| 4295 | * is relative to the current image filename (or absolute) */ |
| 4296 | path_combine(filename_tmp, PATH_MAX, curr_bs->filename, |
| 4297 | curr_bs->backing_file); |
| 4298 | |
| 4299 | if (!realpath(filename_tmp, backing_file_full)) { |
| 4300 | continue; |
| 4301 | } |
| 4302 | |
| 4303 | if (strcmp(backing_file_full, filename_full) == 0) { |
| 4304 | retval = curr_bs->backing_hd; |
| 4305 | break; |
| 4306 | } |
Marcelo Tosatti | e8a6bb9 | 2012-01-18 14:40:51 +0000 | [diff] [blame] | 4307 | } |
| 4308 | } |
| 4309 | |
Jeff Cody | b1b1d78 | 2012-10-16 15:49:09 -0400 | [diff] [blame] | 4310 | g_free(filename_full); |
| 4311 | g_free(backing_file_full); |
| 4312 | g_free(filename_tmp); |
| 4313 | return retval; |
Marcelo Tosatti | e8a6bb9 | 2012-01-18 14:40:51 +0000 | [diff] [blame] | 4314 | } |
| 4315 | |
Benoît Canet | f198fd1 | 2012-08-02 10:22:47 +0200 | [diff] [blame] | 4316 | int bdrv_get_backing_file_depth(BlockDriverState *bs) |
| 4317 | { |
| 4318 | if (!bs->drv) { |
| 4319 | return 0; |
| 4320 | } |
| 4321 | |
| 4322 | if (!bs->backing_hd) { |
| 4323 | return 0; |
| 4324 | } |
| 4325 | |
| 4326 | return 1 + bdrv_get_backing_file_depth(bs->backing_hd); |
| 4327 | } |
| 4328 | |
Jeff Cody | 79fac56 | 2012-09-27 13:29:15 -0400 | [diff] [blame] | 4329 | BlockDriverState *bdrv_find_base(BlockDriverState *bs) |
| 4330 | { |
| 4331 | BlockDriverState *curr_bs = NULL; |
| 4332 | |
| 4333 | if (!bs) { |
| 4334 | return NULL; |
| 4335 | } |
| 4336 | |
| 4337 | curr_bs = bs; |
| 4338 | |
| 4339 | while (curr_bs->backing_hd) { |
| 4340 | curr_bs = curr_bs->backing_hd; |
| 4341 | } |
| 4342 | return curr_bs; |
| 4343 | } |
| 4344 | |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 4345 | /**************************************************************/ |
| 4346 | /* async I/Os */ |
| 4347 | |
aliguori | 3b69e4b | 2009-01-22 16:59:24 +0000 | [diff] [blame] | 4348 | BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
aliguori | f141eaf | 2009-04-07 18:43:24 +0000 | [diff] [blame] | 4349 | QEMUIOVector *qiov, int nb_sectors, |
aliguori | 3b69e4b | 2009-01-22 16:59:24 +0000 | [diff] [blame] | 4350 | BlockDriverCompletionFunc *cb, void *opaque) |
| 4351 | { |
Stefan Hajnoczi | bbf0a44 | 2010-10-05 14:28:53 +0100 | [diff] [blame] | 4352 | trace_bdrv_aio_readv(bs, sector_num, nb_sectors, opaque); |
| 4353 | |
Paolo Bonzini | d20d9b7 | 2013-11-22 13:39:44 +0100 | [diff] [blame] | 4354 | return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, 0, |
Stefan Hajnoczi | 8c5873d | 2011-10-13 21:09:28 +0100 | [diff] [blame] | 4355 | cb, opaque, false); |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 4356 | } |
| 4357 | |
aliguori | f141eaf | 2009-04-07 18:43:24 +0000 | [diff] [blame] | 4358 | BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
| 4359 | QEMUIOVector *qiov, int nb_sectors, |
| 4360 | BlockDriverCompletionFunc *cb, void *opaque) |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 4361 | { |
Stefan Hajnoczi | bbf0a44 | 2010-10-05 14:28:53 +0100 | [diff] [blame] | 4362 | trace_bdrv_aio_writev(bs, sector_num, nb_sectors, opaque); |
| 4363 | |
Paolo Bonzini | d20d9b7 | 2013-11-22 13:39:44 +0100 | [diff] [blame] | 4364 | return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, 0, |
Stefan Hajnoczi | 8c5873d | 2011-10-13 21:09:28 +0100 | [diff] [blame] | 4365 | cb, opaque, true); |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 4366 | } |
| 4367 | |
Paolo Bonzini | d5ef94d | 2013-11-22 13:39:46 +0100 | [diff] [blame] | 4368 | BlockDriverAIOCB *bdrv_aio_write_zeroes(BlockDriverState *bs, |
| 4369 | int64_t sector_num, int nb_sectors, BdrvRequestFlags flags, |
| 4370 | BlockDriverCompletionFunc *cb, void *opaque) |
| 4371 | { |
| 4372 | trace_bdrv_aio_write_zeroes(bs, sector_num, nb_sectors, flags, opaque); |
| 4373 | |
| 4374 | return bdrv_co_aio_rw_vector(bs, sector_num, NULL, nb_sectors, |
| 4375 | BDRV_REQ_ZERO_WRITE | flags, |
| 4376 | cb, opaque, true); |
| 4377 | } |
| 4378 | |
Kevin Wolf | 40b4f53 | 2009-09-09 17:53:37 +0200 | [diff] [blame] | 4379 | |
| 4380 | typedef struct MultiwriteCB { |
| 4381 | int error; |
| 4382 | int num_requests; |
| 4383 | int num_callbacks; |
| 4384 | struct { |
| 4385 | BlockDriverCompletionFunc *cb; |
| 4386 | void *opaque; |
| 4387 | QEMUIOVector *free_qiov; |
Kevin Wolf | 40b4f53 | 2009-09-09 17:53:37 +0200 | [diff] [blame] | 4388 | } callbacks[]; |
| 4389 | } MultiwriteCB; |
| 4390 | |
| 4391 | static void multiwrite_user_cb(MultiwriteCB *mcb) |
| 4392 | { |
| 4393 | int i; |
| 4394 | |
| 4395 | for (i = 0; i < mcb->num_callbacks; i++) { |
| 4396 | mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); |
Stefan Hajnoczi | 1e1ea48 | 2010-04-21 20:35:45 +0100 | [diff] [blame] | 4397 | if (mcb->callbacks[i].free_qiov) { |
| 4398 | qemu_iovec_destroy(mcb->callbacks[i].free_qiov); |
| 4399 | } |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 4400 | g_free(mcb->callbacks[i].free_qiov); |
Kevin Wolf | 40b4f53 | 2009-09-09 17:53:37 +0200 | [diff] [blame] | 4401 | } |
| 4402 | } |
| 4403 | |
| 4404 | static void multiwrite_cb(void *opaque, int ret) |
| 4405 | { |
| 4406 | MultiwriteCB *mcb = opaque; |
| 4407 | |
Stefan Hajnoczi | 6d519a5 | 2010-05-22 18:15:08 +0100 | [diff] [blame] | 4408 | trace_multiwrite_cb(mcb, ret); |
| 4409 | |
Kevin Wolf | cb6d3ca | 2010-04-01 22:48:44 +0200 | [diff] [blame] | 4410 | if (ret < 0 && !mcb->error) { |
Kevin Wolf | 40b4f53 | 2009-09-09 17:53:37 +0200 | [diff] [blame] | 4411 | mcb->error = ret; |
Kevin Wolf | 40b4f53 | 2009-09-09 17:53:37 +0200 | [diff] [blame] | 4412 | } |
| 4413 | |
| 4414 | mcb->num_requests--; |
| 4415 | if (mcb->num_requests == 0) { |
Kevin Wolf | de189a1 | 2010-07-01 16:08:51 +0200 | [diff] [blame] | 4416 | multiwrite_user_cb(mcb); |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 4417 | g_free(mcb); |
Kevin Wolf | 40b4f53 | 2009-09-09 17:53:37 +0200 | [diff] [blame] | 4418 | } |
| 4419 | } |
| 4420 | |
| 4421 | static int multiwrite_req_compare(const void *a, const void *b) |
| 4422 | { |
Christoph Hellwig | 77be436 | 2010-05-19 20:53:10 +0200 | [diff] [blame] | 4423 | const BlockRequest *req1 = a, *req2 = b; |
| 4424 | |
| 4425 | /* |
| 4426 | * Note that we can't simply subtract req2->sector from req1->sector |
| 4427 | * here as that could overflow the return value. |
| 4428 | */ |
| 4429 | if (req1->sector > req2->sector) { |
| 4430 | return 1; |
| 4431 | } else if (req1->sector < req2->sector) { |
| 4432 | return -1; |
| 4433 | } else { |
| 4434 | return 0; |
| 4435 | } |
Kevin Wolf | 40b4f53 | 2009-09-09 17:53:37 +0200 | [diff] [blame] | 4436 | } |
| 4437 | |
| 4438 | /* |
| 4439 | * Takes a bunch of requests and tries to merge them. Returns the number of |
| 4440 | * requests that remain after merging. |
| 4441 | */ |
| 4442 | static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, |
| 4443 | int num_reqs, MultiwriteCB *mcb) |
| 4444 | { |
| 4445 | int i, outidx; |
| 4446 | |
| 4447 | // Sort requests by start sector |
| 4448 | qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare); |
| 4449 | |
| 4450 | // Check if adjacent requests touch the same clusters. If so, combine them, |
| 4451 | // filling up gaps with zero sectors. |
| 4452 | outidx = 0; |
| 4453 | for (i = 1; i < num_reqs; i++) { |
| 4454 | int merge = 0; |
| 4455 | int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; |
| 4456 | |
Paolo Bonzini | b6a127a | 2012-02-21 16:43:52 +0100 | [diff] [blame] | 4457 | // Handle exactly sequential writes and overlapping writes. |
Kevin Wolf | 40b4f53 | 2009-09-09 17:53:37 +0200 | [diff] [blame] | 4458 | if (reqs[i].sector <= oldreq_last) { |
| 4459 | merge = 1; |
| 4460 | } |
| 4461 | |
Christoph Hellwig | e2a305f | 2010-01-26 14:49:08 +0100 | [diff] [blame] | 4462 | if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) { |
| 4463 | merge = 0; |
| 4464 | } |
| 4465 | |
Kevin Wolf | 40b4f53 | 2009-09-09 17:53:37 +0200 | [diff] [blame] | 4466 | if (merge) { |
| 4467 | size_t size; |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 4468 | QEMUIOVector *qiov = g_malloc0(sizeof(*qiov)); |
Kevin Wolf | 40b4f53 | 2009-09-09 17:53:37 +0200 | [diff] [blame] | 4469 | qemu_iovec_init(qiov, |
| 4470 | reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1); |
| 4471 | |
| 4472 | // Add the first request to the merged one. If the requests are |
| 4473 | // overlapping, drop the last sectors of the first request. |
| 4474 | size = (reqs[i].sector - reqs[outidx].sector) << 9; |
Michael Tokarev | 1b093c4 | 2012-03-12 21:28:06 +0400 | [diff] [blame] | 4475 | qemu_iovec_concat(qiov, reqs[outidx].qiov, 0, size); |
Kevin Wolf | 40b4f53 | 2009-09-09 17:53:37 +0200 | [diff] [blame] | 4476 | |
Paolo Bonzini | b6a127a | 2012-02-21 16:43:52 +0100 | [diff] [blame] | 4477 | // We should need to add any zeros between the two requests |
| 4478 | assert (reqs[i].sector <= oldreq_last); |
Kevin Wolf | 40b4f53 | 2009-09-09 17:53:37 +0200 | [diff] [blame] | 4479 | |
| 4480 | // Add the second request |
Michael Tokarev | 1b093c4 | 2012-03-12 21:28:06 +0400 | [diff] [blame] | 4481 | qemu_iovec_concat(qiov, reqs[i].qiov, 0, reqs[i].qiov->size); |
Kevin Wolf | 40b4f53 | 2009-09-09 17:53:37 +0200 | [diff] [blame] | 4482 | |
Kevin Wolf | cbf1dff | 2010-05-21 11:09:42 +0200 | [diff] [blame] | 4483 | reqs[outidx].nb_sectors = qiov->size >> 9; |
Kevin Wolf | 40b4f53 | 2009-09-09 17:53:37 +0200 | [diff] [blame] | 4484 | reqs[outidx].qiov = qiov; |
| 4485 | |
| 4486 | mcb->callbacks[i].free_qiov = reqs[outidx].qiov; |
| 4487 | } else { |
| 4488 | outidx++; |
| 4489 | reqs[outidx].sector = reqs[i].sector; |
| 4490 | reqs[outidx].nb_sectors = reqs[i].nb_sectors; |
| 4491 | reqs[outidx].qiov = reqs[i].qiov; |
| 4492 | } |
| 4493 | } |
| 4494 | |
| 4495 | return outidx + 1; |
| 4496 | } |
| 4497 | |
| 4498 | /* |
| 4499 | * Submit multiple AIO write requests at once. |
| 4500 | * |
| 4501 | * On success, the function returns 0 and all requests in the reqs array have |
| 4502 | * been submitted. In error case this function returns -1, and any of the |
| 4503 | * requests may or may not be submitted yet. In particular, this means that the |
| 4504 | * callback will be called for some of the requests, for others it won't. The |
| 4505 | * caller must check the error field of the BlockRequest to wait for the right |
| 4506 | * callbacks (if error != 0, no callback will be called). |
| 4507 | * |
| 4508 | * The implementation may modify the contents of the reqs array, e.g. to merge |
| 4509 | * requests. However, the fields opaque and error are left unmodified as they |
| 4510 | * are used to signal failure for a single request to the caller. |
| 4511 | */ |
| 4512 | int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) |
| 4513 | { |
Kevin Wolf | 40b4f53 | 2009-09-09 17:53:37 +0200 | [diff] [blame] | 4514 | MultiwriteCB *mcb; |
| 4515 | int i; |
| 4516 | |
Ryan Harper | 301db7c | 2011-03-07 10:01:04 -0600 | [diff] [blame] | 4517 | /* don't submit writes if we don't have a medium */ |
| 4518 | if (bs->drv == NULL) { |
| 4519 | for (i = 0; i < num_reqs; i++) { |
| 4520 | reqs[i].error = -ENOMEDIUM; |
| 4521 | } |
| 4522 | return -1; |
| 4523 | } |
| 4524 | |
Kevin Wolf | 40b4f53 | 2009-09-09 17:53:37 +0200 | [diff] [blame] | 4525 | if (num_reqs == 0) { |
| 4526 | return 0; |
| 4527 | } |
| 4528 | |
| 4529 | // Create MultiwriteCB structure |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 4530 | mcb = g_malloc0(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); |
Kevin Wolf | 40b4f53 | 2009-09-09 17:53:37 +0200 | [diff] [blame] | 4531 | mcb->num_requests = 0; |
| 4532 | mcb->num_callbacks = num_reqs; |
| 4533 | |
| 4534 | for (i = 0; i < num_reqs; i++) { |
| 4535 | mcb->callbacks[i].cb = reqs[i].cb; |
| 4536 | mcb->callbacks[i].opaque = reqs[i].opaque; |
| 4537 | } |
| 4538 | |
| 4539 | // Check for mergable requests |
| 4540 | num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); |
| 4541 | |
Stefan Hajnoczi | 6d519a5 | 2010-05-22 18:15:08 +0100 | [diff] [blame] | 4542 | trace_bdrv_aio_multiwrite(mcb, mcb->num_callbacks, num_reqs); |
| 4543 | |
Paolo Bonzini | df9309f | 2011-11-14 17:50:50 +0100 | [diff] [blame] | 4544 | /* Run the aio requests. */ |
| 4545 | mcb->num_requests = num_reqs; |
Kevin Wolf | 40b4f53 | 2009-09-09 17:53:37 +0200 | [diff] [blame] | 4546 | for (i = 0; i < num_reqs; i++) { |
Paolo Bonzini | d20d9b7 | 2013-11-22 13:39:44 +0100 | [diff] [blame] | 4547 | bdrv_co_aio_rw_vector(bs, reqs[i].sector, reqs[i].qiov, |
| 4548 | reqs[i].nb_sectors, reqs[i].flags, |
| 4549 | multiwrite_cb, mcb, |
| 4550 | true); |
Kevin Wolf | 40b4f53 | 2009-09-09 17:53:37 +0200 | [diff] [blame] | 4551 | } |
| 4552 | |
| 4553 | return 0; |
Kevin Wolf | 40b4f53 | 2009-09-09 17:53:37 +0200 | [diff] [blame] | 4554 | } |
| 4555 | |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 4556 | void bdrv_aio_cancel(BlockDriverAIOCB *acb) |
pbrook | ce1a14d | 2006-08-07 02:38:06 +0000 | [diff] [blame] | 4557 | { |
Stefan Hajnoczi | d7331be | 2012-10-31 16:34:37 +0100 | [diff] [blame] | 4558 | acb->aiocb_info->cancel(acb); |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 4559 | } |
| 4560 | |
| 4561 | /**************************************************************/ |
| 4562 | /* async block device emulation */ |
| 4563 | |
Christoph Hellwig | c16b5a2 | 2009-05-25 12:37:32 +0200 | [diff] [blame] | 4564 | typedef struct BlockDriverAIOCBSync { |
| 4565 | BlockDriverAIOCB common; |
| 4566 | QEMUBH *bh; |
| 4567 | int ret; |
| 4568 | /* vector translation state */ |
| 4569 | QEMUIOVector *qiov; |
| 4570 | uint8_t *bounce; |
| 4571 | int is_write; |
| 4572 | } BlockDriverAIOCBSync; |
| 4573 | |
| 4574 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) |
| 4575 | { |
Kevin Wolf | b666d23 | 2010-05-05 11:44:39 +0200 | [diff] [blame] | 4576 | BlockDriverAIOCBSync *acb = |
| 4577 | container_of(blockacb, BlockDriverAIOCBSync, common); |
Dor Laor | 6a7ad29 | 2009-06-01 12:07:23 +0300 | [diff] [blame] | 4578 | qemu_bh_delete(acb->bh); |
Avi Kivity | 36afc45 | 2009-06-23 16:20:36 +0300 | [diff] [blame] | 4579 | acb->bh = NULL; |
Christoph Hellwig | c16b5a2 | 2009-05-25 12:37:32 +0200 | [diff] [blame] | 4580 | qemu_aio_release(acb); |
| 4581 | } |
| 4582 | |
Stefan Hajnoczi | d7331be | 2012-10-31 16:34:37 +0100 | [diff] [blame] | 4583 | static const AIOCBInfo bdrv_em_aiocb_info = { |
Christoph Hellwig | c16b5a2 | 2009-05-25 12:37:32 +0200 | [diff] [blame] | 4584 | .aiocb_size = sizeof(BlockDriverAIOCBSync), |
| 4585 | .cancel = bdrv_aio_cancel_em, |
| 4586 | }; |
| 4587 | |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 4588 | static void bdrv_aio_bh_cb(void *opaque) |
bellard | beac80c | 2006-06-26 20:08:57 +0000 | [diff] [blame] | 4589 | { |
pbrook | ce1a14d | 2006-08-07 02:38:06 +0000 | [diff] [blame] | 4590 | BlockDriverAIOCBSync *acb = opaque; |
aliguori | f141eaf | 2009-04-07 18:43:24 +0000 | [diff] [blame] | 4591 | |
aliguori | f141eaf | 2009-04-07 18:43:24 +0000 | [diff] [blame] | 4592 | if (!acb->is_write) |
Michael Tokarev | 0339614 | 2012-06-07 20:17:55 +0400 | [diff] [blame] | 4593 | qemu_iovec_from_buf(acb->qiov, 0, acb->bounce, acb->qiov->size); |
aliguori | ceb42de | 2009-04-07 18:43:28 +0000 | [diff] [blame] | 4594 | qemu_vfree(acb->bounce); |
pbrook | ce1a14d | 2006-08-07 02:38:06 +0000 | [diff] [blame] | 4595 | acb->common.cb(acb->common.opaque, acb->ret); |
Dor Laor | 6a7ad29 | 2009-06-01 12:07:23 +0300 | [diff] [blame] | 4596 | qemu_bh_delete(acb->bh); |
Avi Kivity | 36afc45 | 2009-06-23 16:20:36 +0300 | [diff] [blame] | 4597 | acb->bh = NULL; |
pbrook | ce1a14d | 2006-08-07 02:38:06 +0000 | [diff] [blame] | 4598 | qemu_aio_release(acb); |
bellard | beac80c | 2006-06-26 20:08:57 +0000 | [diff] [blame] | 4599 | } |
bellard | beac80c | 2006-06-26 20:08:57 +0000 | [diff] [blame] | 4600 | |
aliguori | f141eaf | 2009-04-07 18:43:24 +0000 | [diff] [blame] | 4601 | static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs, |
| 4602 | int64_t sector_num, |
| 4603 | QEMUIOVector *qiov, |
| 4604 | int nb_sectors, |
| 4605 | BlockDriverCompletionFunc *cb, |
| 4606 | void *opaque, |
| 4607 | int is_write) |
| 4608 | |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 4609 | { |
pbrook | ce1a14d | 2006-08-07 02:38:06 +0000 | [diff] [blame] | 4610 | BlockDriverAIOCBSync *acb; |
pbrook | ce1a14d | 2006-08-07 02:38:06 +0000 | [diff] [blame] | 4611 | |
Stefan Hajnoczi | d7331be | 2012-10-31 16:34:37 +0100 | [diff] [blame] | 4612 | acb = qemu_aio_get(&bdrv_em_aiocb_info, bs, cb, opaque); |
aliguori | f141eaf | 2009-04-07 18:43:24 +0000 | [diff] [blame] | 4613 | acb->is_write = is_write; |
| 4614 | acb->qiov = qiov; |
aliguori | e268ca5 | 2009-04-22 20:20:00 +0000 | [diff] [blame] | 4615 | acb->bounce = qemu_blockalign(bs, qiov->size); |
Stefan Hajnoczi | 2572b37 | 2014-05-08 16:34:34 +0200 | [diff] [blame] | 4616 | acb->bh = aio_bh_new(bdrv_get_aio_context(bs), bdrv_aio_bh_cb, acb); |
aliguori | f141eaf | 2009-04-07 18:43:24 +0000 | [diff] [blame] | 4617 | |
| 4618 | if (is_write) { |
Michael Tokarev | d5e6b16 | 2012-06-07 20:21:06 +0400 | [diff] [blame] | 4619 | qemu_iovec_to_buf(acb->qiov, 0, acb->bounce, qiov->size); |
Stefan Hajnoczi | 1ed20ac | 2011-10-13 13:08:21 +0100 | [diff] [blame] | 4620 | acb->ret = bs->drv->bdrv_write(bs, sector_num, acb->bounce, nb_sectors); |
aliguori | f141eaf | 2009-04-07 18:43:24 +0000 | [diff] [blame] | 4621 | } else { |
Stefan Hajnoczi | 1ed20ac | 2011-10-13 13:08:21 +0100 | [diff] [blame] | 4622 | acb->ret = bs->drv->bdrv_read(bs, sector_num, acb->bounce, nb_sectors); |
aliguori | f141eaf | 2009-04-07 18:43:24 +0000 | [diff] [blame] | 4623 | } |
| 4624 | |
pbrook | ce1a14d | 2006-08-07 02:38:06 +0000 | [diff] [blame] | 4625 | qemu_bh_schedule(acb->bh); |
aliguori | f141eaf | 2009-04-07 18:43:24 +0000 | [diff] [blame] | 4626 | |
pbrook | ce1a14d | 2006-08-07 02:38:06 +0000 | [diff] [blame] | 4627 | return &acb->common; |
pbrook | 7a6cba6 | 2006-06-04 11:39:07 +0000 | [diff] [blame] | 4628 | } |
| 4629 | |
aliguori | f141eaf | 2009-04-07 18:43:24 +0000 | [diff] [blame] | 4630 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
| 4631 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, |
pbrook | ce1a14d | 2006-08-07 02:38:06 +0000 | [diff] [blame] | 4632 | BlockDriverCompletionFunc *cb, void *opaque) |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 4633 | { |
aliguori | f141eaf | 2009-04-07 18:43:24 +0000 | [diff] [blame] | 4634 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
bellard | 83f6409 | 2006-08-01 16:21:11 +0000 | [diff] [blame] | 4635 | } |
| 4636 | |
aliguori | f141eaf | 2009-04-07 18:43:24 +0000 | [diff] [blame] | 4637 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
| 4638 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, |
| 4639 | BlockDriverCompletionFunc *cb, void *opaque) |
| 4640 | { |
| 4641 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); |
| 4642 | } |
| 4643 | |
Kevin Wolf | 6848542 | 2011-06-30 10:05:46 +0200 | [diff] [blame] | 4644 | |
| 4645 | typedef struct BlockDriverAIOCBCoroutine { |
| 4646 | BlockDriverAIOCB common; |
| 4647 | BlockRequest req; |
| 4648 | bool is_write; |
Kevin Wolf | d318aea | 2012-11-13 16:35:08 +0100 | [diff] [blame] | 4649 | bool *done; |
Kevin Wolf | 6848542 | 2011-06-30 10:05:46 +0200 | [diff] [blame] | 4650 | QEMUBH* bh; |
| 4651 | } BlockDriverAIOCBCoroutine; |
| 4652 | |
| 4653 | static void bdrv_aio_co_cancel_em(BlockDriverAIOCB *blockacb) |
| 4654 | { |
Stefan Hajnoczi | 2572b37 | 2014-05-08 16:34:34 +0200 | [diff] [blame] | 4655 | AioContext *aio_context = bdrv_get_aio_context(blockacb->bs); |
Kevin Wolf | d318aea | 2012-11-13 16:35:08 +0100 | [diff] [blame] | 4656 | BlockDriverAIOCBCoroutine *acb = |
| 4657 | container_of(blockacb, BlockDriverAIOCBCoroutine, common); |
| 4658 | bool done = false; |
| 4659 | |
| 4660 | acb->done = &done; |
| 4661 | while (!done) { |
Stefan Hajnoczi | 2572b37 | 2014-05-08 16:34:34 +0200 | [diff] [blame] | 4662 | aio_poll(aio_context, true); |
Kevin Wolf | d318aea | 2012-11-13 16:35:08 +0100 | [diff] [blame] | 4663 | } |
Kevin Wolf | 6848542 | 2011-06-30 10:05:46 +0200 | [diff] [blame] | 4664 | } |
| 4665 | |
Stefan Hajnoczi | d7331be | 2012-10-31 16:34:37 +0100 | [diff] [blame] | 4666 | static const AIOCBInfo bdrv_em_co_aiocb_info = { |
Kevin Wolf | 6848542 | 2011-06-30 10:05:46 +0200 | [diff] [blame] | 4667 | .aiocb_size = sizeof(BlockDriverAIOCBCoroutine), |
| 4668 | .cancel = bdrv_aio_co_cancel_em, |
| 4669 | }; |
| 4670 | |
Paolo Bonzini | 35246a6 | 2011-10-14 10:41:29 +0200 | [diff] [blame] | 4671 | static void bdrv_co_em_bh(void *opaque) |
Kevin Wolf | 6848542 | 2011-06-30 10:05:46 +0200 | [diff] [blame] | 4672 | { |
| 4673 | BlockDriverAIOCBCoroutine *acb = opaque; |
| 4674 | |
| 4675 | acb->common.cb(acb->common.opaque, acb->req.error); |
Kevin Wolf | d318aea | 2012-11-13 16:35:08 +0100 | [diff] [blame] | 4676 | |
| 4677 | if (acb->done) { |
| 4678 | *acb->done = true; |
| 4679 | } |
| 4680 | |
Kevin Wolf | 6848542 | 2011-06-30 10:05:46 +0200 | [diff] [blame] | 4681 | qemu_bh_delete(acb->bh); |
| 4682 | qemu_aio_release(acb); |
| 4683 | } |
| 4684 | |
Stefan Hajnoczi | b2a6137 | 2011-10-13 13:08:23 +0100 | [diff] [blame] | 4685 | /* Invoke bdrv_co_do_readv/bdrv_co_do_writev */ |
| 4686 | static void coroutine_fn bdrv_co_do_rw(void *opaque) |
| 4687 | { |
| 4688 | BlockDriverAIOCBCoroutine *acb = opaque; |
| 4689 | BlockDriverState *bs = acb->common.bs; |
| 4690 | |
| 4691 | if (!acb->is_write) { |
| 4692 | acb->req.error = bdrv_co_do_readv(bs, acb->req.sector, |
Paolo Bonzini | d20d9b7 | 2013-11-22 13:39:44 +0100 | [diff] [blame] | 4693 | acb->req.nb_sectors, acb->req.qiov, acb->req.flags); |
Stefan Hajnoczi | b2a6137 | 2011-10-13 13:08:23 +0100 | [diff] [blame] | 4694 | } else { |
| 4695 | acb->req.error = bdrv_co_do_writev(bs, acb->req.sector, |
Paolo Bonzini | d20d9b7 | 2013-11-22 13:39:44 +0100 | [diff] [blame] | 4696 | acb->req.nb_sectors, acb->req.qiov, acb->req.flags); |
Stefan Hajnoczi | b2a6137 | 2011-10-13 13:08:23 +0100 | [diff] [blame] | 4697 | } |
| 4698 | |
Stefan Hajnoczi | 2572b37 | 2014-05-08 16:34:34 +0200 | [diff] [blame] | 4699 | acb->bh = aio_bh_new(bdrv_get_aio_context(bs), bdrv_co_em_bh, acb); |
Stefan Hajnoczi | b2a6137 | 2011-10-13 13:08:23 +0100 | [diff] [blame] | 4700 | qemu_bh_schedule(acb->bh); |
| 4701 | } |
| 4702 | |
Kevin Wolf | 6848542 | 2011-06-30 10:05:46 +0200 | [diff] [blame] | 4703 | static BlockDriverAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs, |
| 4704 | int64_t sector_num, |
| 4705 | QEMUIOVector *qiov, |
| 4706 | int nb_sectors, |
Paolo Bonzini | d20d9b7 | 2013-11-22 13:39:44 +0100 | [diff] [blame] | 4707 | BdrvRequestFlags flags, |
Kevin Wolf | 6848542 | 2011-06-30 10:05:46 +0200 | [diff] [blame] | 4708 | BlockDriverCompletionFunc *cb, |
| 4709 | void *opaque, |
Stefan Hajnoczi | 8c5873d | 2011-10-13 21:09:28 +0100 | [diff] [blame] | 4710 | bool is_write) |
Kevin Wolf | 6848542 | 2011-06-30 10:05:46 +0200 | [diff] [blame] | 4711 | { |
| 4712 | Coroutine *co; |
| 4713 | BlockDriverAIOCBCoroutine *acb; |
| 4714 | |
Stefan Hajnoczi | d7331be | 2012-10-31 16:34:37 +0100 | [diff] [blame] | 4715 | acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque); |
Kevin Wolf | 6848542 | 2011-06-30 10:05:46 +0200 | [diff] [blame] | 4716 | acb->req.sector = sector_num; |
| 4717 | acb->req.nb_sectors = nb_sectors; |
| 4718 | acb->req.qiov = qiov; |
Paolo Bonzini | d20d9b7 | 2013-11-22 13:39:44 +0100 | [diff] [blame] | 4719 | acb->req.flags = flags; |
Kevin Wolf | 6848542 | 2011-06-30 10:05:46 +0200 | [diff] [blame] | 4720 | acb->is_write = is_write; |
Kevin Wolf | d318aea | 2012-11-13 16:35:08 +0100 | [diff] [blame] | 4721 | acb->done = NULL; |
Kevin Wolf | 6848542 | 2011-06-30 10:05:46 +0200 | [diff] [blame] | 4722 | |
Stefan Hajnoczi | 8c5873d | 2011-10-13 21:09:28 +0100 | [diff] [blame] | 4723 | co = qemu_coroutine_create(bdrv_co_do_rw); |
Kevin Wolf | 6848542 | 2011-06-30 10:05:46 +0200 | [diff] [blame] | 4724 | qemu_coroutine_enter(co, acb); |
| 4725 | |
| 4726 | return &acb->common; |
| 4727 | } |
| 4728 | |
Paolo Bonzini | 07f0761 | 2011-10-17 12:32:12 +0200 | [diff] [blame] | 4729 | static void coroutine_fn bdrv_aio_flush_co_entry(void *opaque) |
Christoph Hellwig | b2e12bc | 2009-09-04 19:01:49 +0200 | [diff] [blame] | 4730 | { |
Paolo Bonzini | 07f0761 | 2011-10-17 12:32:12 +0200 | [diff] [blame] | 4731 | BlockDriverAIOCBCoroutine *acb = opaque; |
| 4732 | BlockDriverState *bs = acb->common.bs; |
Christoph Hellwig | b2e12bc | 2009-09-04 19:01:49 +0200 | [diff] [blame] | 4733 | |
Paolo Bonzini | 07f0761 | 2011-10-17 12:32:12 +0200 | [diff] [blame] | 4734 | acb->req.error = bdrv_co_flush(bs); |
Stefan Hajnoczi | 2572b37 | 2014-05-08 16:34:34 +0200 | [diff] [blame] | 4735 | acb->bh = aio_bh_new(bdrv_get_aio_context(bs), bdrv_co_em_bh, acb); |
Christoph Hellwig | b2e12bc | 2009-09-04 19:01:49 +0200 | [diff] [blame] | 4736 | qemu_bh_schedule(acb->bh); |
Christoph Hellwig | b2e12bc | 2009-09-04 19:01:49 +0200 | [diff] [blame] | 4737 | } |
| 4738 | |
Paolo Bonzini | 07f0761 | 2011-10-17 12:32:12 +0200 | [diff] [blame] | 4739 | BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, |
Alexander Graf | 016f5cf | 2010-05-26 17:51:49 +0200 | [diff] [blame] | 4740 | BlockDriverCompletionFunc *cb, void *opaque) |
| 4741 | { |
Paolo Bonzini | 07f0761 | 2011-10-17 12:32:12 +0200 | [diff] [blame] | 4742 | trace_bdrv_aio_flush(bs, opaque); |
Alexander Graf | 016f5cf | 2010-05-26 17:51:49 +0200 | [diff] [blame] | 4743 | |
Paolo Bonzini | 07f0761 | 2011-10-17 12:32:12 +0200 | [diff] [blame] | 4744 | Coroutine *co; |
| 4745 | BlockDriverAIOCBCoroutine *acb; |
Alexander Graf | 016f5cf | 2010-05-26 17:51:49 +0200 | [diff] [blame] | 4746 | |
Stefan Hajnoczi | d7331be | 2012-10-31 16:34:37 +0100 | [diff] [blame] | 4747 | acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque); |
Kevin Wolf | d318aea | 2012-11-13 16:35:08 +0100 | [diff] [blame] | 4748 | acb->done = NULL; |
| 4749 | |
Paolo Bonzini | 07f0761 | 2011-10-17 12:32:12 +0200 | [diff] [blame] | 4750 | co = qemu_coroutine_create(bdrv_aio_flush_co_entry); |
| 4751 | qemu_coroutine_enter(co, acb); |
Alexander Graf | 016f5cf | 2010-05-26 17:51:49 +0200 | [diff] [blame] | 4752 | |
Alexander Graf | 016f5cf | 2010-05-26 17:51:49 +0200 | [diff] [blame] | 4753 | return &acb->common; |
| 4754 | } |
| 4755 | |
Paolo Bonzini | 4265d62 | 2011-10-17 12:32:14 +0200 | [diff] [blame] | 4756 | static void coroutine_fn bdrv_aio_discard_co_entry(void *opaque) |
| 4757 | { |
| 4758 | BlockDriverAIOCBCoroutine *acb = opaque; |
| 4759 | BlockDriverState *bs = acb->common.bs; |
| 4760 | |
| 4761 | acb->req.error = bdrv_co_discard(bs, acb->req.sector, acb->req.nb_sectors); |
Stefan Hajnoczi | 2572b37 | 2014-05-08 16:34:34 +0200 | [diff] [blame] | 4762 | acb->bh = aio_bh_new(bdrv_get_aio_context(bs), bdrv_co_em_bh, acb); |
Paolo Bonzini | 4265d62 | 2011-10-17 12:32:14 +0200 | [diff] [blame] | 4763 | qemu_bh_schedule(acb->bh); |
| 4764 | } |
| 4765 | |
| 4766 | BlockDriverAIOCB *bdrv_aio_discard(BlockDriverState *bs, |
| 4767 | int64_t sector_num, int nb_sectors, |
| 4768 | BlockDriverCompletionFunc *cb, void *opaque) |
| 4769 | { |
| 4770 | Coroutine *co; |
| 4771 | BlockDriverAIOCBCoroutine *acb; |
| 4772 | |
| 4773 | trace_bdrv_aio_discard(bs, sector_num, nb_sectors, opaque); |
| 4774 | |
Stefan Hajnoczi | d7331be | 2012-10-31 16:34:37 +0100 | [diff] [blame] | 4775 | acb = qemu_aio_get(&bdrv_em_co_aiocb_info, bs, cb, opaque); |
Paolo Bonzini | 4265d62 | 2011-10-17 12:32:14 +0200 | [diff] [blame] | 4776 | acb->req.sector = sector_num; |
| 4777 | acb->req.nb_sectors = nb_sectors; |
Kevin Wolf | d318aea | 2012-11-13 16:35:08 +0100 | [diff] [blame] | 4778 | acb->done = NULL; |
Paolo Bonzini | 4265d62 | 2011-10-17 12:32:14 +0200 | [diff] [blame] | 4779 | co = qemu_coroutine_create(bdrv_aio_discard_co_entry); |
| 4780 | qemu_coroutine_enter(co, acb); |
| 4781 | |
| 4782 | return &acb->common; |
| 4783 | } |
| 4784 | |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 4785 | void bdrv_init(void) |
| 4786 | { |
Anthony Liguori | 5efa9d5 | 2009-05-09 17:03:42 -0500 | [diff] [blame] | 4787 | module_call_init(MODULE_INIT_BLOCK); |
bellard | ea2384d | 2004-08-01 21:59:26 +0000 | [diff] [blame] | 4788 | } |
pbrook | ce1a14d | 2006-08-07 02:38:06 +0000 | [diff] [blame] | 4789 | |
Markus Armbruster | eb85201 | 2009-10-27 18:41:44 +0100 | [diff] [blame] | 4790 | void bdrv_init_with_whitelist(void) |
| 4791 | { |
| 4792 | use_bdrv_whitelist = 1; |
| 4793 | bdrv_init(); |
| 4794 | } |
| 4795 | |
Stefan Hajnoczi | d7331be | 2012-10-31 16:34:37 +0100 | [diff] [blame] | 4796 | void *qemu_aio_get(const AIOCBInfo *aiocb_info, BlockDriverState *bs, |
Christoph Hellwig | c16b5a2 | 2009-05-25 12:37:32 +0200 | [diff] [blame] | 4797 | BlockDriverCompletionFunc *cb, void *opaque) |
aliguori | 6bbff9a | 2009-03-20 18:25:59 +0000 | [diff] [blame] | 4798 | { |
pbrook | ce1a14d | 2006-08-07 02:38:06 +0000 | [diff] [blame] | 4799 | BlockDriverAIOCB *acb; |
| 4800 | |
Stefan Hajnoczi | d7331be | 2012-10-31 16:34:37 +0100 | [diff] [blame] | 4801 | acb = g_slice_alloc(aiocb_info->aiocb_size); |
| 4802 | acb->aiocb_info = aiocb_info; |
pbrook | ce1a14d | 2006-08-07 02:38:06 +0000 | [diff] [blame] | 4803 | acb->bs = bs; |
| 4804 | acb->cb = cb; |
| 4805 | acb->opaque = opaque; |
| 4806 | return acb; |
| 4807 | } |
| 4808 | |
| 4809 | void qemu_aio_release(void *p) |
| 4810 | { |
Stefan Hajnoczi | d37c975 | 2012-10-31 16:34:36 +0100 | [diff] [blame] | 4811 | BlockDriverAIOCB *acb = p; |
Stefan Hajnoczi | d7331be | 2012-10-31 16:34:37 +0100 | [diff] [blame] | 4812 | g_slice_free1(acb->aiocb_info->aiocb_size, acb); |
pbrook | ce1a14d | 2006-08-07 02:38:06 +0000 | [diff] [blame] | 4813 | } |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 4814 | |
| 4815 | /**************************************************************/ |
Kevin Wolf | f9f05dc | 2011-07-15 13:50:26 +0200 | [diff] [blame] | 4816 | /* Coroutine block device emulation */ |
| 4817 | |
| 4818 | typedef struct CoroutineIOCompletion { |
| 4819 | Coroutine *coroutine; |
| 4820 | int ret; |
| 4821 | } CoroutineIOCompletion; |
| 4822 | |
| 4823 | static void bdrv_co_io_em_complete(void *opaque, int ret) |
| 4824 | { |
| 4825 | CoroutineIOCompletion *co = opaque; |
| 4826 | |
| 4827 | co->ret = ret; |
| 4828 | qemu_coroutine_enter(co->coroutine, NULL); |
| 4829 | } |
| 4830 | |
| 4831 | static int coroutine_fn bdrv_co_io_em(BlockDriverState *bs, int64_t sector_num, |
| 4832 | int nb_sectors, QEMUIOVector *iov, |
| 4833 | bool is_write) |
| 4834 | { |
| 4835 | CoroutineIOCompletion co = { |
| 4836 | .coroutine = qemu_coroutine_self(), |
| 4837 | }; |
| 4838 | BlockDriverAIOCB *acb; |
| 4839 | |
| 4840 | if (is_write) { |
Stefan Hajnoczi | a652d16 | 2011-10-05 17:17:02 +0100 | [diff] [blame] | 4841 | acb = bs->drv->bdrv_aio_writev(bs, sector_num, iov, nb_sectors, |
| 4842 | bdrv_co_io_em_complete, &co); |
Kevin Wolf | f9f05dc | 2011-07-15 13:50:26 +0200 | [diff] [blame] | 4843 | } else { |
Stefan Hajnoczi | a652d16 | 2011-10-05 17:17:02 +0100 | [diff] [blame] | 4844 | acb = bs->drv->bdrv_aio_readv(bs, sector_num, iov, nb_sectors, |
| 4845 | bdrv_co_io_em_complete, &co); |
Kevin Wolf | f9f05dc | 2011-07-15 13:50:26 +0200 | [diff] [blame] | 4846 | } |
| 4847 | |
Stefan Hajnoczi | 59370aa | 2011-09-30 17:34:58 +0100 | [diff] [blame] | 4848 | trace_bdrv_co_io_em(bs, sector_num, nb_sectors, is_write, acb); |
Kevin Wolf | f9f05dc | 2011-07-15 13:50:26 +0200 | [diff] [blame] | 4849 | if (!acb) { |
| 4850 | return -EIO; |
| 4851 | } |
| 4852 | qemu_coroutine_yield(); |
| 4853 | |
| 4854 | return co.ret; |
| 4855 | } |
| 4856 | |
| 4857 | static int coroutine_fn bdrv_co_readv_em(BlockDriverState *bs, |
| 4858 | int64_t sector_num, int nb_sectors, |
| 4859 | QEMUIOVector *iov) |
| 4860 | { |
| 4861 | return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, false); |
| 4862 | } |
| 4863 | |
| 4864 | static int coroutine_fn bdrv_co_writev_em(BlockDriverState *bs, |
| 4865 | int64_t sector_num, int nb_sectors, |
| 4866 | QEMUIOVector *iov) |
| 4867 | { |
| 4868 | return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, true); |
| 4869 | } |
| 4870 | |
Paolo Bonzini | 07f0761 | 2011-10-17 12:32:12 +0200 | [diff] [blame] | 4871 | static void coroutine_fn bdrv_flush_co_entry(void *opaque) |
Kevin Wolf | e7a8a78 | 2011-07-15 16:05:00 +0200 | [diff] [blame] | 4872 | { |
Paolo Bonzini | 07f0761 | 2011-10-17 12:32:12 +0200 | [diff] [blame] | 4873 | RwCo *rwco = opaque; |
Kevin Wolf | e7a8a78 | 2011-07-15 16:05:00 +0200 | [diff] [blame] | 4874 | |
Paolo Bonzini | 07f0761 | 2011-10-17 12:32:12 +0200 | [diff] [blame] | 4875 | rwco->ret = bdrv_co_flush(rwco->bs); |
| 4876 | } |
| 4877 | |
| 4878 | int coroutine_fn bdrv_co_flush(BlockDriverState *bs) |
| 4879 | { |
Kevin Wolf | eb489bb | 2011-11-10 18:10:11 +0100 | [diff] [blame] | 4880 | int ret; |
| 4881 | |
Paolo Bonzini | 29cdb25 | 2012-03-12 18:26:01 +0100 | [diff] [blame] | 4882 | if (!bs || !bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) { |
Paolo Bonzini | 07f0761 | 2011-10-17 12:32:12 +0200 | [diff] [blame] | 4883 | return 0; |
Kevin Wolf | eb489bb | 2011-11-10 18:10:11 +0100 | [diff] [blame] | 4884 | } |
| 4885 | |
Kevin Wolf | ca71636 | 2011-11-10 18:13:59 +0100 | [diff] [blame] | 4886 | /* Write back cached data to the OS even with cache=unsafe */ |
Kevin Wolf | bf736fe | 2013-06-05 15:17:55 +0200 | [diff] [blame] | 4887 | BLKDBG_EVENT(bs->file, BLKDBG_FLUSH_TO_OS); |
Kevin Wolf | eb489bb | 2011-11-10 18:10:11 +0100 | [diff] [blame] | 4888 | if (bs->drv->bdrv_co_flush_to_os) { |
| 4889 | ret = bs->drv->bdrv_co_flush_to_os(bs); |
| 4890 | if (ret < 0) { |
| 4891 | return ret; |
| 4892 | } |
| 4893 | } |
| 4894 | |
Kevin Wolf | ca71636 | 2011-11-10 18:13:59 +0100 | [diff] [blame] | 4895 | /* But don't actually force it to the disk with cache=unsafe */ |
| 4896 | if (bs->open_flags & BDRV_O_NO_FLUSH) { |
Kevin Wolf | d4c8232 | 2012-08-15 12:52:45 +0200 | [diff] [blame] | 4897 | goto flush_parent; |
Kevin Wolf | ca71636 | 2011-11-10 18:13:59 +0100 | [diff] [blame] | 4898 | } |
| 4899 | |
Kevin Wolf | bf736fe | 2013-06-05 15:17:55 +0200 | [diff] [blame] | 4900 | BLKDBG_EVENT(bs->file, BLKDBG_FLUSH_TO_DISK); |
Kevin Wolf | eb489bb | 2011-11-10 18:10:11 +0100 | [diff] [blame] | 4901 | if (bs->drv->bdrv_co_flush_to_disk) { |
Paolo Bonzini | 29cdb25 | 2012-03-12 18:26:01 +0100 | [diff] [blame] | 4902 | ret = bs->drv->bdrv_co_flush_to_disk(bs); |
Paolo Bonzini | 07f0761 | 2011-10-17 12:32:12 +0200 | [diff] [blame] | 4903 | } else if (bs->drv->bdrv_aio_flush) { |
| 4904 | BlockDriverAIOCB *acb; |
| 4905 | CoroutineIOCompletion co = { |
| 4906 | .coroutine = qemu_coroutine_self(), |
| 4907 | }; |
| 4908 | |
| 4909 | acb = bs->drv->bdrv_aio_flush(bs, bdrv_co_io_em_complete, &co); |
| 4910 | if (acb == NULL) { |
Paolo Bonzini | 29cdb25 | 2012-03-12 18:26:01 +0100 | [diff] [blame] | 4911 | ret = -EIO; |
Paolo Bonzini | 07f0761 | 2011-10-17 12:32:12 +0200 | [diff] [blame] | 4912 | } else { |
| 4913 | qemu_coroutine_yield(); |
Paolo Bonzini | 29cdb25 | 2012-03-12 18:26:01 +0100 | [diff] [blame] | 4914 | ret = co.ret; |
Paolo Bonzini | 07f0761 | 2011-10-17 12:32:12 +0200 | [diff] [blame] | 4915 | } |
Paolo Bonzini | 07f0761 | 2011-10-17 12:32:12 +0200 | [diff] [blame] | 4916 | } else { |
| 4917 | /* |
| 4918 | * Some block drivers always operate in either writethrough or unsafe |
| 4919 | * mode and don't support bdrv_flush therefore. Usually qemu doesn't |
| 4920 | * know how the server works (because the behaviour is hardcoded or |
| 4921 | * depends on server-side configuration), so we can't ensure that |
| 4922 | * everything is safe on disk. Returning an error doesn't work because |
| 4923 | * that would break guests even if the server operates in writethrough |
| 4924 | * mode. |
| 4925 | * |
| 4926 | * Let's hope the user knows what he's doing. |
| 4927 | */ |
Paolo Bonzini | 29cdb25 | 2012-03-12 18:26:01 +0100 | [diff] [blame] | 4928 | ret = 0; |
Kevin Wolf | e7a8a78 | 2011-07-15 16:05:00 +0200 | [diff] [blame] | 4929 | } |
Paolo Bonzini | 29cdb25 | 2012-03-12 18:26:01 +0100 | [diff] [blame] | 4930 | if (ret < 0) { |
| 4931 | return ret; |
| 4932 | } |
| 4933 | |
| 4934 | /* Now flush the underlying protocol. It will also have BDRV_O_NO_FLUSH |
| 4935 | * in the case of cache=unsafe, so there are no useless flushes. |
| 4936 | */ |
Kevin Wolf | d4c8232 | 2012-08-15 12:52:45 +0200 | [diff] [blame] | 4937 | flush_parent: |
Paolo Bonzini | 29cdb25 | 2012-03-12 18:26:01 +0100 | [diff] [blame] | 4938 | return bdrv_co_flush(bs->file); |
Paolo Bonzini | 07f0761 | 2011-10-17 12:32:12 +0200 | [diff] [blame] | 4939 | } |
| 4940 | |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 4941 | void bdrv_invalidate_cache(BlockDriverState *bs, Error **errp) |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 4942 | { |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 4943 | Error *local_err = NULL; |
| 4944 | int ret; |
| 4945 | |
Kevin Wolf | 3456a8d | 2014-03-11 10:58:39 +0100 | [diff] [blame] | 4946 | if (!bs->drv) { |
| 4947 | return; |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 4948 | } |
Kevin Wolf | 3456a8d | 2014-03-11 10:58:39 +0100 | [diff] [blame] | 4949 | |
| 4950 | if (bs->drv->bdrv_invalidate_cache) { |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 4951 | bs->drv->bdrv_invalidate_cache(bs, &local_err); |
Kevin Wolf | 3456a8d | 2014-03-11 10:58:39 +0100 | [diff] [blame] | 4952 | } else if (bs->file) { |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 4953 | bdrv_invalidate_cache(bs->file, &local_err); |
| 4954 | } |
| 4955 | if (local_err) { |
| 4956 | error_propagate(errp, local_err); |
| 4957 | return; |
Kevin Wolf | 3456a8d | 2014-03-11 10:58:39 +0100 | [diff] [blame] | 4958 | } |
| 4959 | |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 4960 | ret = refresh_total_sectors(bs, bs->total_sectors); |
| 4961 | if (ret < 0) { |
| 4962 | error_setg_errno(errp, -ret, "Could not refresh total sector count"); |
| 4963 | return; |
| 4964 | } |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 4965 | } |
| 4966 | |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 4967 | void bdrv_invalidate_cache_all(Error **errp) |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 4968 | { |
| 4969 | BlockDriverState *bs; |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 4970 | Error *local_err = NULL; |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 4971 | |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 4972 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
Stefan Hajnoczi | ed78cda | 2014-05-08 16:34:35 +0200 | [diff] [blame] | 4973 | AioContext *aio_context = bdrv_get_aio_context(bs); |
| 4974 | |
| 4975 | aio_context_acquire(aio_context); |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 4976 | bdrv_invalidate_cache(bs, &local_err); |
Stefan Hajnoczi | ed78cda | 2014-05-08 16:34:35 +0200 | [diff] [blame] | 4977 | aio_context_release(aio_context); |
Kevin Wolf | 5a8a30d | 2014-03-12 15:59:16 +0100 | [diff] [blame] | 4978 | if (local_err) { |
| 4979 | error_propagate(errp, local_err); |
| 4980 | return; |
| 4981 | } |
Anthony Liguori | 0f15423 | 2011-11-14 15:09:45 -0600 | [diff] [blame] | 4982 | } |
| 4983 | } |
| 4984 | |
Benoît Canet | 0778926 | 2012-03-23 08:36:49 +0100 | [diff] [blame] | 4985 | void bdrv_clear_incoming_migration_all(void) |
| 4986 | { |
| 4987 | BlockDriverState *bs; |
| 4988 | |
Benoît Canet | dc364f4 | 2014-01-23 21:31:32 +0100 | [diff] [blame] | 4989 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
Stefan Hajnoczi | ed78cda | 2014-05-08 16:34:35 +0200 | [diff] [blame] | 4990 | AioContext *aio_context = bdrv_get_aio_context(bs); |
| 4991 | |
| 4992 | aio_context_acquire(aio_context); |
Benoît Canet | 0778926 | 2012-03-23 08:36:49 +0100 | [diff] [blame] | 4993 | bs->open_flags = bs->open_flags & ~(BDRV_O_INCOMING); |
Stefan Hajnoczi | ed78cda | 2014-05-08 16:34:35 +0200 | [diff] [blame] | 4994 | aio_context_release(aio_context); |
Benoît Canet | 0778926 | 2012-03-23 08:36:49 +0100 | [diff] [blame] | 4995 | } |
| 4996 | } |
| 4997 | |
Paolo Bonzini | 07f0761 | 2011-10-17 12:32:12 +0200 | [diff] [blame] | 4998 | int bdrv_flush(BlockDriverState *bs) |
| 4999 | { |
| 5000 | Coroutine *co; |
| 5001 | RwCo rwco = { |
| 5002 | .bs = bs, |
| 5003 | .ret = NOT_DONE, |
| 5004 | }; |
| 5005 | |
| 5006 | if (qemu_in_coroutine()) { |
| 5007 | /* Fast-path if already in coroutine context */ |
| 5008 | bdrv_flush_co_entry(&rwco); |
| 5009 | } else { |
Stefan Hajnoczi | 2572b37 | 2014-05-08 16:34:34 +0200 | [diff] [blame] | 5010 | AioContext *aio_context = bdrv_get_aio_context(bs); |
| 5011 | |
Paolo Bonzini | 07f0761 | 2011-10-17 12:32:12 +0200 | [diff] [blame] | 5012 | co = qemu_coroutine_create(bdrv_flush_co_entry); |
| 5013 | qemu_coroutine_enter(co, &rwco); |
| 5014 | while (rwco.ret == NOT_DONE) { |
Stefan Hajnoczi | 2572b37 | 2014-05-08 16:34:34 +0200 | [diff] [blame] | 5015 | aio_poll(aio_context, true); |
Paolo Bonzini | 07f0761 | 2011-10-17 12:32:12 +0200 | [diff] [blame] | 5016 | } |
| 5017 | } |
| 5018 | |
| 5019 | return rwco.ret; |
Kevin Wolf | e7a8a78 | 2011-07-15 16:05:00 +0200 | [diff] [blame] | 5020 | } |
| 5021 | |
Kevin Wolf | 775aa8b | 2013-12-05 12:09:38 +0100 | [diff] [blame] | 5022 | typedef struct DiscardCo { |
| 5023 | BlockDriverState *bs; |
| 5024 | int64_t sector_num; |
| 5025 | int nb_sectors; |
| 5026 | int ret; |
| 5027 | } DiscardCo; |
Paolo Bonzini | 4265d62 | 2011-10-17 12:32:14 +0200 | [diff] [blame] | 5028 | static void coroutine_fn bdrv_discard_co_entry(void *opaque) |
| 5029 | { |
Kevin Wolf | 775aa8b | 2013-12-05 12:09:38 +0100 | [diff] [blame] | 5030 | DiscardCo *rwco = opaque; |
Paolo Bonzini | 4265d62 | 2011-10-17 12:32:14 +0200 | [diff] [blame] | 5031 | |
| 5032 | rwco->ret = bdrv_co_discard(rwco->bs, rwco->sector_num, rwco->nb_sectors); |
| 5033 | } |
| 5034 | |
Peter Lieven | 6f14da5 | 2013-10-24 12:06:59 +0200 | [diff] [blame] | 5035 | /* if no limit is specified in the BlockLimits use a default |
| 5036 | * of 32768 512-byte sectors (16 MiB) per request. |
| 5037 | */ |
| 5038 | #define MAX_DISCARD_DEFAULT 32768 |
| 5039 | |
Paolo Bonzini | 4265d62 | 2011-10-17 12:32:14 +0200 | [diff] [blame] | 5040 | int coroutine_fn bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, |
| 5041 | int nb_sectors) |
| 5042 | { |
Paolo Bonzini | d51e9fe | 2013-11-22 13:39:43 +0100 | [diff] [blame] | 5043 | int max_discard; |
| 5044 | |
Paolo Bonzini | 4265d62 | 2011-10-17 12:32:14 +0200 | [diff] [blame] | 5045 | if (!bs->drv) { |
| 5046 | return -ENOMEDIUM; |
| 5047 | } else if (bdrv_check_request(bs, sector_num, nb_sectors)) { |
| 5048 | return -EIO; |
| 5049 | } else if (bs->read_only) { |
| 5050 | return -EROFS; |
Paolo Bonzini | df702c9 | 2013-01-14 16:26:58 +0100 | [diff] [blame] | 5051 | } |
| 5052 | |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 5053 | bdrv_reset_dirty(bs, sector_num, nb_sectors); |
Paolo Bonzini | df702c9 | 2013-01-14 16:26:58 +0100 | [diff] [blame] | 5054 | |
Paolo Bonzini | 9e8f183 | 2013-02-08 14:06:11 +0100 | [diff] [blame] | 5055 | /* Do nothing if disabled. */ |
| 5056 | if (!(bs->open_flags & BDRV_O_UNMAP)) { |
| 5057 | return 0; |
| 5058 | } |
| 5059 | |
Paolo Bonzini | d51e9fe | 2013-11-22 13:39:43 +0100 | [diff] [blame] | 5060 | if (!bs->drv->bdrv_co_discard && !bs->drv->bdrv_aio_discard) { |
Paolo Bonzini | 4265d62 | 2011-10-17 12:32:14 +0200 | [diff] [blame] | 5061 | return 0; |
| 5062 | } |
Paolo Bonzini | d51e9fe | 2013-11-22 13:39:43 +0100 | [diff] [blame] | 5063 | |
| 5064 | max_discard = bs->bl.max_discard ? bs->bl.max_discard : MAX_DISCARD_DEFAULT; |
| 5065 | while (nb_sectors > 0) { |
| 5066 | int ret; |
| 5067 | int num = nb_sectors; |
| 5068 | |
| 5069 | /* align request */ |
| 5070 | if (bs->bl.discard_alignment && |
| 5071 | num >= bs->bl.discard_alignment && |
| 5072 | sector_num % bs->bl.discard_alignment) { |
| 5073 | if (num > bs->bl.discard_alignment) { |
| 5074 | num = bs->bl.discard_alignment; |
| 5075 | } |
| 5076 | num -= sector_num % bs->bl.discard_alignment; |
| 5077 | } |
| 5078 | |
| 5079 | /* limit request size */ |
| 5080 | if (num > max_discard) { |
| 5081 | num = max_discard; |
| 5082 | } |
| 5083 | |
| 5084 | if (bs->drv->bdrv_co_discard) { |
| 5085 | ret = bs->drv->bdrv_co_discard(bs, sector_num, num); |
| 5086 | } else { |
| 5087 | BlockDriverAIOCB *acb; |
| 5088 | CoroutineIOCompletion co = { |
| 5089 | .coroutine = qemu_coroutine_self(), |
| 5090 | }; |
| 5091 | |
| 5092 | acb = bs->drv->bdrv_aio_discard(bs, sector_num, nb_sectors, |
| 5093 | bdrv_co_io_em_complete, &co); |
| 5094 | if (acb == NULL) { |
| 5095 | return -EIO; |
| 5096 | } else { |
| 5097 | qemu_coroutine_yield(); |
| 5098 | ret = co.ret; |
| 5099 | } |
| 5100 | } |
Paolo Bonzini | 7ce2101 | 2013-11-22 13:39:47 +0100 | [diff] [blame] | 5101 | if (ret && ret != -ENOTSUP) { |
Paolo Bonzini | d51e9fe | 2013-11-22 13:39:43 +0100 | [diff] [blame] | 5102 | return ret; |
| 5103 | } |
| 5104 | |
| 5105 | sector_num += num; |
| 5106 | nb_sectors -= num; |
| 5107 | } |
| 5108 | return 0; |
Paolo Bonzini | 4265d62 | 2011-10-17 12:32:14 +0200 | [diff] [blame] | 5109 | } |
| 5110 | |
| 5111 | int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors) |
| 5112 | { |
| 5113 | Coroutine *co; |
Kevin Wolf | 775aa8b | 2013-12-05 12:09:38 +0100 | [diff] [blame] | 5114 | DiscardCo rwco = { |
Paolo Bonzini | 4265d62 | 2011-10-17 12:32:14 +0200 | [diff] [blame] | 5115 | .bs = bs, |
| 5116 | .sector_num = sector_num, |
| 5117 | .nb_sectors = nb_sectors, |
| 5118 | .ret = NOT_DONE, |
| 5119 | }; |
| 5120 | |
| 5121 | if (qemu_in_coroutine()) { |
| 5122 | /* Fast-path if already in coroutine context */ |
| 5123 | bdrv_discard_co_entry(&rwco); |
| 5124 | } else { |
Stefan Hajnoczi | 2572b37 | 2014-05-08 16:34:34 +0200 | [diff] [blame] | 5125 | AioContext *aio_context = bdrv_get_aio_context(bs); |
| 5126 | |
Paolo Bonzini | 4265d62 | 2011-10-17 12:32:14 +0200 | [diff] [blame] | 5127 | co = qemu_coroutine_create(bdrv_discard_co_entry); |
| 5128 | qemu_coroutine_enter(co, &rwco); |
| 5129 | while (rwco.ret == NOT_DONE) { |
Stefan Hajnoczi | 2572b37 | 2014-05-08 16:34:34 +0200 | [diff] [blame] | 5130 | aio_poll(aio_context, true); |
Paolo Bonzini | 4265d62 | 2011-10-17 12:32:14 +0200 | [diff] [blame] | 5131 | } |
| 5132 | } |
| 5133 | |
| 5134 | return rwco.ret; |
| 5135 | } |
| 5136 | |
Kevin Wolf | f9f05dc | 2011-07-15 13:50:26 +0200 | [diff] [blame] | 5137 | /**************************************************************/ |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 5138 | /* removable device support */ |
| 5139 | |
| 5140 | /** |
| 5141 | * Return TRUE if the media is present |
| 5142 | */ |
| 5143 | int bdrv_is_inserted(BlockDriverState *bs) |
| 5144 | { |
| 5145 | BlockDriver *drv = bs->drv; |
Markus Armbruster | a1aff5b | 2011-09-06 18:58:41 +0200 | [diff] [blame] | 5146 | |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 5147 | if (!drv) |
| 5148 | return 0; |
| 5149 | if (!drv->bdrv_is_inserted) |
Markus Armbruster | a1aff5b | 2011-09-06 18:58:41 +0200 | [diff] [blame] | 5150 | return 1; |
| 5151 | return drv->bdrv_is_inserted(bs); |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 5152 | } |
| 5153 | |
| 5154 | /** |
Markus Armbruster | 8e49ca4 | 2011-08-03 15:08:08 +0200 | [diff] [blame] | 5155 | * Return whether the media changed since the last call to this |
| 5156 | * function, or -ENOTSUP if we don't know. Most drivers don't know. |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 5157 | */ |
| 5158 | int bdrv_media_changed(BlockDriverState *bs) |
| 5159 | { |
| 5160 | BlockDriver *drv = bs->drv; |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 5161 | |
Markus Armbruster | 8e49ca4 | 2011-08-03 15:08:08 +0200 | [diff] [blame] | 5162 | if (drv && drv->bdrv_media_changed) { |
| 5163 | return drv->bdrv_media_changed(bs); |
| 5164 | } |
| 5165 | return -ENOTSUP; |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 5166 | } |
| 5167 | |
| 5168 | /** |
| 5169 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray |
| 5170 | */ |
Luiz Capitulino | f36f394 | 2012-02-03 16:24:53 -0200 | [diff] [blame] | 5171 | void bdrv_eject(BlockDriverState *bs, bool eject_flag) |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 5172 | { |
| 5173 | BlockDriver *drv = bs->drv; |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 5174 | |
Markus Armbruster | 822e1cd | 2011-07-20 18:23:42 +0200 | [diff] [blame] | 5175 | if (drv && drv->bdrv_eject) { |
| 5176 | drv->bdrv_eject(bs, eject_flag); |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 5177 | } |
Luiz Capitulino | 6f382ed | 2012-02-14 13:41:13 -0200 | [diff] [blame] | 5178 | |
| 5179 | if (bs->device_name[0] != '\0') { |
Wenchao Xia | a5ee7bd | 2014-06-18 08:43:44 +0200 | [diff] [blame] | 5180 | qapi_event_send_device_tray_moved(bdrv_get_device_name(bs), |
| 5181 | eject_flag, &error_abort); |
Luiz Capitulino | 6f382ed | 2012-02-14 13:41:13 -0200 | [diff] [blame] | 5182 | } |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 5183 | } |
| 5184 | |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 5185 | /** |
| 5186 | * Lock or unlock the media (if it is locked, the user won't be able |
| 5187 | * to eject it manually). |
| 5188 | */ |
Markus Armbruster | 025e849 | 2011-09-06 18:58:47 +0200 | [diff] [blame] | 5189 | void bdrv_lock_medium(BlockDriverState *bs, bool locked) |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 5190 | { |
| 5191 | BlockDriver *drv = bs->drv; |
| 5192 | |
Markus Armbruster | 025e849 | 2011-09-06 18:58:47 +0200 | [diff] [blame] | 5193 | trace_bdrv_lock_medium(bs, locked); |
Stefan Hajnoczi | b8c6d09 | 2011-03-29 20:04:40 +0100 | [diff] [blame] | 5194 | |
Markus Armbruster | 025e849 | 2011-09-06 18:58:47 +0200 | [diff] [blame] | 5195 | if (drv && drv->bdrv_lock_medium) { |
| 5196 | drv->bdrv_lock_medium(bs, locked); |
bellard | 19cb373 | 2006-08-19 11:45:59 +0000 | [diff] [blame] | 5197 | } |
| 5198 | } |
ths | 985a03b | 2007-12-24 16:10:43 +0000 | [diff] [blame] | 5199 | |
| 5200 | /* needed for generic scsi interface */ |
| 5201 | |
| 5202 | int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) |
| 5203 | { |
| 5204 | BlockDriver *drv = bs->drv; |
| 5205 | |
| 5206 | if (drv && drv->bdrv_ioctl) |
| 5207 | return drv->bdrv_ioctl(bs, req, buf); |
| 5208 | return -ENOTSUP; |
| 5209 | } |
aliguori | 7d78066 | 2009-03-12 19:57:08 +0000 | [diff] [blame] | 5210 | |
aliguori | 221f715 | 2009-03-28 17:28:41 +0000 | [diff] [blame] | 5211 | BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, |
| 5212 | unsigned long int req, void *buf, |
| 5213 | BlockDriverCompletionFunc *cb, void *opaque) |
aliguori | 7d78066 | 2009-03-12 19:57:08 +0000 | [diff] [blame] | 5214 | { |
aliguori | 221f715 | 2009-03-28 17:28:41 +0000 | [diff] [blame] | 5215 | BlockDriver *drv = bs->drv; |
aliguori | 7d78066 | 2009-03-12 19:57:08 +0000 | [diff] [blame] | 5216 | |
aliguori | 221f715 | 2009-03-28 17:28:41 +0000 | [diff] [blame] | 5217 | if (drv && drv->bdrv_aio_ioctl) |
| 5218 | return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque); |
| 5219 | return NULL; |
aliguori | 7d78066 | 2009-03-12 19:57:08 +0000 | [diff] [blame] | 5220 | } |
aliguori | e268ca5 | 2009-04-22 20:20:00 +0000 | [diff] [blame] | 5221 | |
Paolo Bonzini | 1b7fd72 | 2011-11-29 11:35:47 +0100 | [diff] [blame] | 5222 | void bdrv_set_guest_block_size(BlockDriverState *bs, int align) |
Markus Armbruster | 7b6f930 | 2011-09-06 18:58:56 +0200 | [diff] [blame] | 5223 | { |
Paolo Bonzini | 1b7fd72 | 2011-11-29 11:35:47 +0100 | [diff] [blame] | 5224 | bs->guest_block_size = align; |
Markus Armbruster | 7b6f930 | 2011-09-06 18:58:56 +0200 | [diff] [blame] | 5225 | } |
lirans@il.ibm.com | 7cd1e32 | 2009-11-02 15:40:41 +0200 | [diff] [blame] | 5226 | |
aliguori | e268ca5 | 2009-04-22 20:20:00 +0000 | [diff] [blame] | 5227 | void *qemu_blockalign(BlockDriverState *bs, size_t size) |
| 5228 | { |
Kevin Wolf | 339064d | 2013-11-28 10:23:32 +0100 | [diff] [blame] | 5229 | return qemu_memalign(bdrv_opt_mem_align(bs), size); |
aliguori | e268ca5 | 2009-04-22 20:20:00 +0000 | [diff] [blame] | 5230 | } |
lirans@il.ibm.com | 7cd1e32 | 2009-11-02 15:40:41 +0200 | [diff] [blame] | 5231 | |
Stefan Hajnoczi | c53b1c5 | 2013-01-11 16:41:27 +0100 | [diff] [blame] | 5232 | /* |
| 5233 | * Check if all memory in this vector is sector aligned. |
| 5234 | */ |
| 5235 | bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov) |
| 5236 | { |
| 5237 | int i; |
Kevin Wolf | 339064d | 2013-11-28 10:23:32 +0100 | [diff] [blame] | 5238 | size_t alignment = bdrv_opt_mem_align(bs); |
Stefan Hajnoczi | c53b1c5 | 2013-01-11 16:41:27 +0100 | [diff] [blame] | 5239 | |
| 5240 | for (i = 0; i < qiov->niov; i++) { |
Kevin Wolf | 339064d | 2013-11-28 10:23:32 +0100 | [diff] [blame] | 5241 | if ((uintptr_t) qiov->iov[i].iov_base % alignment) { |
Stefan Hajnoczi | c53b1c5 | 2013-01-11 16:41:27 +0100 | [diff] [blame] | 5242 | return false; |
| 5243 | } |
Kevin Wolf | 339064d | 2013-11-28 10:23:32 +0100 | [diff] [blame] | 5244 | if (qiov->iov[i].iov_len % alignment) { |
Kevin Wolf | 1ff735b | 2013-12-05 13:01:46 +0100 | [diff] [blame] | 5245 | return false; |
| 5246 | } |
Stefan Hajnoczi | c53b1c5 | 2013-01-11 16:41:27 +0100 | [diff] [blame] | 5247 | } |
| 5248 | |
| 5249 | return true; |
| 5250 | } |
| 5251 | |
Fam Zheng | b8afb52 | 2014-04-16 09:34:30 +0800 | [diff] [blame] | 5252 | BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs, int granularity, |
| 5253 | Error **errp) |
lirans@il.ibm.com | 7cd1e32 | 2009-11-02 15:40:41 +0200 | [diff] [blame] | 5254 | { |
| 5255 | int64_t bitmap_size; |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 5256 | BdrvDirtyBitmap *bitmap; |
Jan Kiszka | a55eb92 | 2009-11-30 18:21:19 +0100 | [diff] [blame] | 5257 | |
Paolo Bonzini | 50717e9 | 2013-01-21 17:09:45 +0100 | [diff] [blame] | 5258 | assert((granularity & (granularity - 1)) == 0); |
| 5259 | |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 5260 | granularity >>= BDRV_SECTOR_BITS; |
| 5261 | assert(granularity); |
Fam Zheng | b8afb52 | 2014-04-16 09:34:30 +0800 | [diff] [blame] | 5262 | bitmap_size = bdrv_getlength(bs); |
| 5263 | if (bitmap_size < 0) { |
| 5264 | error_setg_errno(errp, -bitmap_size, "could not get length of device"); |
| 5265 | errno = -bitmap_size; |
| 5266 | return NULL; |
| 5267 | } |
| 5268 | bitmap_size >>= BDRV_SECTOR_BITS; |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 5269 | bitmap = g_malloc0(sizeof(BdrvDirtyBitmap)); |
| 5270 | bitmap->bitmap = hbitmap_alloc(bitmap_size, ffs(granularity) - 1); |
| 5271 | QLIST_INSERT_HEAD(&bs->dirty_bitmaps, bitmap, list); |
| 5272 | return bitmap; |
| 5273 | } |
| 5274 | |
| 5275 | void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap) |
| 5276 | { |
| 5277 | BdrvDirtyBitmap *bm, *next; |
| 5278 | QLIST_FOREACH_SAFE(bm, &bs->dirty_bitmaps, list, next) { |
| 5279 | if (bm == bitmap) { |
| 5280 | QLIST_REMOVE(bitmap, list); |
| 5281 | hbitmap_free(bitmap->bitmap); |
| 5282 | g_free(bitmap); |
| 5283 | return; |
Jan Kiszka | a55eb92 | 2009-11-30 18:21:19 +0100 | [diff] [blame] | 5284 | } |
lirans@il.ibm.com | 7cd1e32 | 2009-11-02 15:40:41 +0200 | [diff] [blame] | 5285 | } |
| 5286 | } |
| 5287 | |
Fam Zheng | 21b5683 | 2013-11-13 18:29:44 +0800 | [diff] [blame] | 5288 | BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs) |
| 5289 | { |
| 5290 | BdrvDirtyBitmap *bm; |
| 5291 | BlockDirtyInfoList *list = NULL; |
| 5292 | BlockDirtyInfoList **plist = &list; |
| 5293 | |
| 5294 | QLIST_FOREACH(bm, &bs->dirty_bitmaps, list) { |
| 5295 | BlockDirtyInfo *info = g_malloc0(sizeof(BlockDirtyInfo)); |
| 5296 | BlockDirtyInfoList *entry = g_malloc0(sizeof(BlockDirtyInfoList)); |
| 5297 | info->count = bdrv_get_dirty_count(bs, bm); |
| 5298 | info->granularity = |
| 5299 | ((int64_t) BDRV_SECTOR_SIZE << hbitmap_granularity(bm->bitmap)); |
| 5300 | entry->value = info; |
| 5301 | *plist = entry; |
| 5302 | plist = &entry->next; |
| 5303 | } |
| 5304 | |
| 5305 | return list; |
| 5306 | } |
| 5307 | |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 5308 | int bdrv_get_dirty(BlockDriverState *bs, BdrvDirtyBitmap *bitmap, int64_t sector) |
lirans@il.ibm.com | 7cd1e32 | 2009-11-02 15:40:41 +0200 | [diff] [blame] | 5309 | { |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 5310 | if (bitmap) { |
| 5311 | return hbitmap_get(bitmap->bitmap, sector); |
lirans@il.ibm.com | 7cd1e32 | 2009-11-02 15:40:41 +0200 | [diff] [blame] | 5312 | } else { |
| 5313 | return 0; |
| 5314 | } |
| 5315 | } |
| 5316 | |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 5317 | void bdrv_dirty_iter_init(BlockDriverState *bs, |
| 5318 | BdrvDirtyBitmap *bitmap, HBitmapIter *hbi) |
Paolo Bonzini | 1755da1 | 2012-10-18 16:49:18 +0200 | [diff] [blame] | 5319 | { |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 5320 | hbitmap_iter_init(hbi, bitmap->bitmap, 0); |
Paolo Bonzini | 1755da1 | 2012-10-18 16:49:18 +0200 | [diff] [blame] | 5321 | } |
| 5322 | |
| 5323 | void bdrv_set_dirty(BlockDriverState *bs, int64_t cur_sector, |
| 5324 | int nr_sectors) |
| 5325 | { |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 5326 | BdrvDirtyBitmap *bitmap; |
| 5327 | QLIST_FOREACH(bitmap, &bs->dirty_bitmaps, list) { |
| 5328 | hbitmap_set(bitmap->bitmap, cur_sector, nr_sectors); |
Paolo Bonzini | 8f0720e | 2013-01-21 17:09:41 +0100 | [diff] [blame] | 5329 | } |
Liran Schour | aaa0eb7 | 2010-01-26 10:31:48 +0200 | [diff] [blame] | 5330 | } |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5331 | |
Fam Zheng | e4654d2 | 2013-11-13 18:29:43 +0800 | [diff] [blame] | 5332 | void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, int nr_sectors) |
| 5333 | { |
| 5334 | BdrvDirtyBitmap *bitmap; |
| 5335 | QLIST_FOREACH(bitmap, &bs->dirty_bitmaps, list) { |
| 5336 | hbitmap_reset(bitmap->bitmap, cur_sector, nr_sectors); |
| 5337 | } |
| 5338 | } |
| 5339 | |
| 5340 | int64_t bdrv_get_dirty_count(BlockDriverState *bs, BdrvDirtyBitmap *bitmap) |
| 5341 | { |
| 5342 | return hbitmap_count(bitmap->bitmap); |
| 5343 | } |
| 5344 | |
Fam Zheng | 9fcb025 | 2013-08-23 09:14:46 +0800 | [diff] [blame] | 5345 | /* Get a reference to bs */ |
| 5346 | void bdrv_ref(BlockDriverState *bs) |
| 5347 | { |
| 5348 | bs->refcnt++; |
| 5349 | } |
| 5350 | |
| 5351 | /* Release a previously grabbed reference to bs. |
| 5352 | * If after releasing, reference count is zero, the BlockDriverState is |
| 5353 | * deleted. */ |
| 5354 | void bdrv_unref(BlockDriverState *bs) |
| 5355 | { |
| 5356 | assert(bs->refcnt > 0); |
| 5357 | if (--bs->refcnt == 0) { |
| 5358 | bdrv_delete(bs); |
| 5359 | } |
| 5360 | } |
| 5361 | |
Fam Zheng | fbe40ff | 2014-05-23 21:29:42 +0800 | [diff] [blame] | 5362 | struct BdrvOpBlocker { |
| 5363 | Error *reason; |
| 5364 | QLIST_ENTRY(BdrvOpBlocker) list; |
| 5365 | }; |
| 5366 | |
| 5367 | bool bdrv_op_is_blocked(BlockDriverState *bs, BlockOpType op, Error **errp) |
| 5368 | { |
| 5369 | BdrvOpBlocker *blocker; |
| 5370 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); |
| 5371 | if (!QLIST_EMPTY(&bs->op_blockers[op])) { |
| 5372 | blocker = QLIST_FIRST(&bs->op_blockers[op]); |
| 5373 | if (errp) { |
| 5374 | error_setg(errp, "Device '%s' is busy: %s", |
| 5375 | bs->device_name, error_get_pretty(blocker->reason)); |
| 5376 | } |
| 5377 | return true; |
| 5378 | } |
| 5379 | return false; |
| 5380 | } |
| 5381 | |
| 5382 | void bdrv_op_block(BlockDriverState *bs, BlockOpType op, Error *reason) |
| 5383 | { |
| 5384 | BdrvOpBlocker *blocker; |
| 5385 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); |
| 5386 | |
| 5387 | blocker = g_malloc0(sizeof(BdrvOpBlocker)); |
| 5388 | blocker->reason = reason; |
| 5389 | QLIST_INSERT_HEAD(&bs->op_blockers[op], blocker, list); |
| 5390 | } |
| 5391 | |
| 5392 | void bdrv_op_unblock(BlockDriverState *bs, BlockOpType op, Error *reason) |
| 5393 | { |
| 5394 | BdrvOpBlocker *blocker, *next; |
| 5395 | assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX); |
| 5396 | QLIST_FOREACH_SAFE(blocker, &bs->op_blockers[op], list, next) { |
| 5397 | if (blocker->reason == reason) { |
| 5398 | QLIST_REMOVE(blocker, list); |
| 5399 | g_free(blocker); |
| 5400 | } |
| 5401 | } |
| 5402 | } |
| 5403 | |
| 5404 | void bdrv_op_block_all(BlockDriverState *bs, Error *reason) |
| 5405 | { |
| 5406 | int i; |
| 5407 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { |
| 5408 | bdrv_op_block(bs, i, reason); |
| 5409 | } |
| 5410 | } |
| 5411 | |
| 5412 | void bdrv_op_unblock_all(BlockDriverState *bs, Error *reason) |
| 5413 | { |
| 5414 | int i; |
| 5415 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { |
| 5416 | bdrv_op_unblock(bs, i, reason); |
| 5417 | } |
| 5418 | } |
| 5419 | |
| 5420 | bool bdrv_op_blocker_is_empty(BlockDriverState *bs) |
| 5421 | { |
| 5422 | int i; |
| 5423 | |
| 5424 | for (i = 0; i < BLOCK_OP_TYPE_MAX; i++) { |
| 5425 | if (!QLIST_EMPTY(&bs->op_blockers[i])) { |
| 5426 | return false; |
| 5427 | } |
| 5428 | } |
| 5429 | return true; |
| 5430 | } |
| 5431 | |
Luiz Capitulino | 28a7282 | 2011-09-26 17:43:50 -0300 | [diff] [blame] | 5432 | void bdrv_iostatus_enable(BlockDriverState *bs) |
| 5433 | { |
Luiz Capitulino | d6bf279 | 2011-10-14 17:11:23 -0300 | [diff] [blame] | 5434 | bs->iostatus_enabled = true; |
Luiz Capitulino | 58e21ef | 2011-10-14 17:22:24 -0300 | [diff] [blame] | 5435 | bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
Luiz Capitulino | 28a7282 | 2011-09-26 17:43:50 -0300 | [diff] [blame] | 5436 | } |
| 5437 | |
| 5438 | /* The I/O status is only enabled if the drive explicitly |
| 5439 | * enables it _and_ the VM is configured to stop on errors */ |
| 5440 | bool bdrv_iostatus_is_enabled(const BlockDriverState *bs) |
| 5441 | { |
Luiz Capitulino | d6bf279 | 2011-10-14 17:11:23 -0300 | [diff] [blame] | 5442 | return (bs->iostatus_enabled && |
Paolo Bonzini | 92aa5c6 | 2012-09-28 17:22:55 +0200 | [diff] [blame] | 5443 | (bs->on_write_error == BLOCKDEV_ON_ERROR_ENOSPC || |
| 5444 | bs->on_write_error == BLOCKDEV_ON_ERROR_STOP || |
| 5445 | bs->on_read_error == BLOCKDEV_ON_ERROR_STOP)); |
Luiz Capitulino | 28a7282 | 2011-09-26 17:43:50 -0300 | [diff] [blame] | 5446 | } |
| 5447 | |
| 5448 | void bdrv_iostatus_disable(BlockDriverState *bs) |
| 5449 | { |
Luiz Capitulino | d6bf279 | 2011-10-14 17:11:23 -0300 | [diff] [blame] | 5450 | bs->iostatus_enabled = false; |
Luiz Capitulino | 28a7282 | 2011-09-26 17:43:50 -0300 | [diff] [blame] | 5451 | } |
| 5452 | |
| 5453 | void bdrv_iostatus_reset(BlockDriverState *bs) |
| 5454 | { |
| 5455 | if (bdrv_iostatus_is_enabled(bs)) { |
Luiz Capitulino | 58e21ef | 2011-10-14 17:22:24 -0300 | [diff] [blame] | 5456 | bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
Paolo Bonzini | 3bd293c | 2012-10-18 16:49:27 +0200 | [diff] [blame] | 5457 | if (bs->job) { |
| 5458 | block_job_iostatus_reset(bs->job); |
| 5459 | } |
Luiz Capitulino | 28a7282 | 2011-09-26 17:43:50 -0300 | [diff] [blame] | 5460 | } |
| 5461 | } |
| 5462 | |
Luiz Capitulino | 28a7282 | 2011-09-26 17:43:50 -0300 | [diff] [blame] | 5463 | void bdrv_iostatus_set_err(BlockDriverState *bs, int error) |
| 5464 | { |
Paolo Bonzini | 3e1caa5 | 2012-09-28 17:22:57 +0200 | [diff] [blame] | 5465 | assert(bdrv_iostatus_is_enabled(bs)); |
| 5466 | if (bs->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { |
Luiz Capitulino | 58e21ef | 2011-10-14 17:22:24 -0300 | [diff] [blame] | 5467 | bs->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : |
| 5468 | BLOCK_DEVICE_IO_STATUS_FAILED; |
Luiz Capitulino | 28a7282 | 2011-09-26 17:43:50 -0300 | [diff] [blame] | 5469 | } |
| 5470 | } |
| 5471 | |
Christoph Hellwig | a597e79 | 2011-08-25 08:26:01 +0200 | [diff] [blame] | 5472 | void |
| 5473 | bdrv_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie, int64_t bytes, |
| 5474 | enum BlockAcctType type) |
| 5475 | { |
| 5476 | assert(type < BDRV_MAX_IOTYPE); |
| 5477 | |
| 5478 | cookie->bytes = bytes; |
Christoph Hellwig | c488c7f | 2011-08-25 08:26:10 +0200 | [diff] [blame] | 5479 | cookie->start_time_ns = get_clock(); |
Christoph Hellwig | a597e79 | 2011-08-25 08:26:01 +0200 | [diff] [blame] | 5480 | cookie->type = type; |
| 5481 | } |
| 5482 | |
| 5483 | void |
| 5484 | bdrv_acct_done(BlockDriverState *bs, BlockAcctCookie *cookie) |
| 5485 | { |
| 5486 | assert(cookie->type < BDRV_MAX_IOTYPE); |
| 5487 | |
| 5488 | bs->nr_bytes[cookie->type] += cookie->bytes; |
| 5489 | bs->nr_ops[cookie->type]++; |
Christoph Hellwig | c488c7f | 2011-08-25 08:26:10 +0200 | [diff] [blame] | 5490 | bs->total_time_ns[cookie->type] += get_clock() - cookie->start_time_ns; |
Christoph Hellwig | a597e79 | 2011-08-25 08:26:01 +0200 | [diff] [blame] | 5491 | } |
| 5492 | |
Luiz Capitulino | d92ada2 | 2012-11-30 10:52:09 -0200 | [diff] [blame] | 5493 | void bdrv_img_create(const char *filename, const char *fmt, |
| 5494 | const char *base_filename, const char *base_fmt, |
Miroslav Rezanina | f382d43 | 2013-02-13 09:09:40 +0100 | [diff] [blame] | 5495 | char *options, uint64_t img_size, int flags, |
| 5496 | Error **errp, bool quiet) |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5497 | { |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 5498 | QemuOptsList *create_opts = NULL; |
| 5499 | QemuOpts *opts = NULL; |
| 5500 | const char *backing_fmt, *backing_file; |
| 5501 | int64_t size; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5502 | BlockDriver *drv, *proto_drv; |
Stefan Hajnoczi | 96df67d | 2011-01-24 09:32:20 +0000 | [diff] [blame] | 5503 | BlockDriver *backing_drv = NULL; |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 5504 | Error *local_err = NULL; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5505 | int ret = 0; |
| 5506 | |
| 5507 | /* Find driver and parse its options */ |
| 5508 | drv = bdrv_find_format(fmt); |
| 5509 | if (!drv) { |
Luiz Capitulino | 71c7981 | 2012-11-30 10:52:04 -0200 | [diff] [blame] | 5510 | error_setg(errp, "Unknown file format '%s'", fmt); |
Luiz Capitulino | d92ada2 | 2012-11-30 10:52:09 -0200 | [diff] [blame] | 5511 | return; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5512 | } |
| 5513 | |
Kevin Wolf | 9828962 | 2013-07-10 15:47:39 +0200 | [diff] [blame] | 5514 | proto_drv = bdrv_find_protocol(filename, true); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5515 | if (!proto_drv) { |
Luiz Capitulino | 71c7981 | 2012-11-30 10:52:04 -0200 | [diff] [blame] | 5516 | error_setg(errp, "Unknown protocol '%s'", filename); |
Luiz Capitulino | d92ada2 | 2012-11-30 10:52:09 -0200 | [diff] [blame] | 5517 | return; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5518 | } |
| 5519 | |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 5520 | create_opts = qemu_opts_append(create_opts, drv->create_opts); |
| 5521 | create_opts = qemu_opts_append(create_opts, proto_drv->create_opts); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5522 | |
| 5523 | /* Create parameter list with default values */ |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 5524 | opts = qemu_opts_create(create_opts, NULL, 0, &error_abort); |
| 5525 | qemu_opt_set_number(opts, BLOCK_OPT_SIZE, img_size); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5526 | |
| 5527 | /* Parse -o options */ |
| 5528 | if (options) { |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 5529 | if (qemu_opts_do_parse(opts, options, NULL) != 0) { |
| 5530 | error_setg(errp, "Invalid options for file format '%s'", fmt); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5531 | goto out; |
| 5532 | } |
| 5533 | } |
| 5534 | |
| 5535 | if (base_filename) { |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 5536 | if (qemu_opt_set(opts, BLOCK_OPT_BACKING_FILE, base_filename)) { |
Luiz Capitulino | 71c7981 | 2012-11-30 10:52:04 -0200 | [diff] [blame] | 5537 | error_setg(errp, "Backing file not supported for file format '%s'", |
| 5538 | fmt); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5539 | goto out; |
| 5540 | } |
| 5541 | } |
| 5542 | |
| 5543 | if (base_fmt) { |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 5544 | if (qemu_opt_set(opts, BLOCK_OPT_BACKING_FMT, base_fmt)) { |
Luiz Capitulino | 71c7981 | 2012-11-30 10:52:04 -0200 | [diff] [blame] | 5545 | error_setg(errp, "Backing file format not supported for file " |
| 5546 | "format '%s'", fmt); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5547 | goto out; |
| 5548 | } |
| 5549 | } |
| 5550 | |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 5551 | backing_file = qemu_opt_get(opts, BLOCK_OPT_BACKING_FILE); |
| 5552 | if (backing_file) { |
| 5553 | if (!strcmp(filename, backing_file)) { |
Luiz Capitulino | 71c7981 | 2012-11-30 10:52:04 -0200 | [diff] [blame] | 5554 | error_setg(errp, "Error: Trying to create an image with the " |
| 5555 | "same filename as the backing file"); |
Jes Sorensen | 792da93 | 2010-12-16 13:52:17 +0100 | [diff] [blame] | 5556 | goto out; |
| 5557 | } |
| 5558 | } |
| 5559 | |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 5560 | backing_fmt = qemu_opt_get(opts, BLOCK_OPT_BACKING_FMT); |
| 5561 | if (backing_fmt) { |
| 5562 | backing_drv = bdrv_find_format(backing_fmt); |
Stefan Hajnoczi | 96df67d | 2011-01-24 09:32:20 +0000 | [diff] [blame] | 5563 | if (!backing_drv) { |
Luiz Capitulino | 71c7981 | 2012-11-30 10:52:04 -0200 | [diff] [blame] | 5564 | error_setg(errp, "Unknown backing file format '%s'", |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 5565 | backing_fmt); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5566 | goto out; |
| 5567 | } |
| 5568 | } |
| 5569 | |
| 5570 | // The size for the image must always be specified, with one exception: |
| 5571 | // If we are using a backing file, we can obtain the size from there |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 5572 | size = qemu_opt_get_size(opts, BLOCK_OPT_SIZE, 0); |
| 5573 | if (size == -1) { |
| 5574 | if (backing_file) { |
Max Reitz | 66f6b81 | 2013-12-03 14:57:52 +0100 | [diff] [blame] | 5575 | BlockDriverState *bs; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5576 | uint64_t size; |
Paolo Bonzini | 63090da | 2012-04-12 14:01:03 +0200 | [diff] [blame] | 5577 | int back_flags; |
| 5578 | |
| 5579 | /* backing files always opened read-only */ |
| 5580 | back_flags = |
| 5581 | flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5582 | |
Max Reitz | f67503e | 2014-02-18 18:33:05 +0100 | [diff] [blame] | 5583 | bs = NULL; |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 5584 | ret = bdrv_open(&bs, backing_file, NULL, NULL, back_flags, |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 5585 | backing_drv, &local_err); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5586 | if (ret < 0) { |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 5587 | error_setg_errno(errp, -ret, "Could not open '%s': %s", |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 5588 | backing_file, |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 5589 | error_get_pretty(local_err)); |
| 5590 | error_free(local_err); |
| 5591 | local_err = NULL; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5592 | goto out; |
| 5593 | } |
| 5594 | bdrv_get_geometry(bs, &size); |
| 5595 | size *= 512; |
| 5596 | |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 5597 | qemu_opt_set_number(opts, BLOCK_OPT_SIZE, size); |
Max Reitz | 66f6b81 | 2013-12-03 14:57:52 +0100 | [diff] [blame] | 5598 | |
| 5599 | bdrv_unref(bs); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5600 | } else { |
Luiz Capitulino | 71c7981 | 2012-11-30 10:52:04 -0200 | [diff] [blame] | 5601 | error_setg(errp, "Image creation needs a size parameter"); |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5602 | goto out; |
| 5603 | } |
| 5604 | } |
| 5605 | |
Miroslav Rezanina | f382d43 | 2013-02-13 09:09:40 +0100 | [diff] [blame] | 5606 | if (!quiet) { |
| 5607 | printf("Formatting '%s', fmt=%s ", filename, fmt); |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 5608 | qemu_opts_print(opts); |
Miroslav Rezanina | f382d43 | 2013-02-13 09:09:40 +0100 | [diff] [blame] | 5609 | puts(""); |
| 5610 | } |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 5611 | |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 5612 | ret = bdrv_create(drv, filename, opts, &local_err); |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 5613 | |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 5614 | if (ret == -EFBIG) { |
| 5615 | /* This is generally a better message than whatever the driver would |
| 5616 | * deliver (especially because of the cluster_size_hint), since that |
| 5617 | * is most probably not much different from "image too large". */ |
| 5618 | const char *cluster_size_hint = ""; |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 5619 | if (qemu_opt_get_size(opts, BLOCK_OPT_CLUSTER_SIZE, 0)) { |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 5620 | cluster_size_hint = " (try using a larger cluster size)"; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5621 | } |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 5622 | error_setg(errp, "The image size is too large for file format '%s'" |
| 5623 | "%s", fmt, cluster_size_hint); |
| 5624 | error_free(local_err); |
| 5625 | local_err = NULL; |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5626 | } |
| 5627 | |
| 5628 | out: |
Chunyan Liu | 83d0521 | 2014-06-05 17:20:51 +0800 | [diff] [blame] | 5629 | qemu_opts_del(opts); |
| 5630 | qemu_opts_free(create_opts); |
Markus Armbruster | 84d18f0 | 2014-01-30 15:07:28 +0100 | [diff] [blame] | 5631 | if (local_err) { |
Max Reitz | cc84d90 | 2013-09-06 17:14:26 +0200 | [diff] [blame] | 5632 | error_propagate(errp, local_err); |
| 5633 | } |
Jes Sorensen | f88e1a4 | 2010-12-16 13:52:15 +0100 | [diff] [blame] | 5634 | } |
Stefan Hajnoczi | 85d126f | 2013-03-07 13:41:48 +0100 | [diff] [blame] | 5635 | |
| 5636 | AioContext *bdrv_get_aio_context(BlockDriverState *bs) |
| 5637 | { |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 5638 | return bs->aio_context; |
| 5639 | } |
| 5640 | |
| 5641 | void bdrv_detach_aio_context(BlockDriverState *bs) |
| 5642 | { |
| 5643 | if (!bs->drv) { |
| 5644 | return; |
| 5645 | } |
| 5646 | |
Stefan Hajnoczi | 13af91e | 2014-05-14 16:22:45 +0200 | [diff] [blame] | 5647 | if (bs->io_limits_enabled) { |
| 5648 | throttle_detach_aio_context(&bs->throttle_state); |
| 5649 | } |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 5650 | if (bs->drv->bdrv_detach_aio_context) { |
| 5651 | bs->drv->bdrv_detach_aio_context(bs); |
| 5652 | } |
| 5653 | if (bs->file) { |
| 5654 | bdrv_detach_aio_context(bs->file); |
| 5655 | } |
| 5656 | if (bs->backing_hd) { |
| 5657 | bdrv_detach_aio_context(bs->backing_hd); |
| 5658 | } |
| 5659 | |
| 5660 | bs->aio_context = NULL; |
| 5661 | } |
| 5662 | |
| 5663 | void bdrv_attach_aio_context(BlockDriverState *bs, |
| 5664 | AioContext *new_context) |
| 5665 | { |
| 5666 | if (!bs->drv) { |
| 5667 | return; |
| 5668 | } |
| 5669 | |
| 5670 | bs->aio_context = new_context; |
| 5671 | |
| 5672 | if (bs->backing_hd) { |
| 5673 | bdrv_attach_aio_context(bs->backing_hd, new_context); |
| 5674 | } |
| 5675 | if (bs->file) { |
| 5676 | bdrv_attach_aio_context(bs->file, new_context); |
| 5677 | } |
| 5678 | if (bs->drv->bdrv_attach_aio_context) { |
| 5679 | bs->drv->bdrv_attach_aio_context(bs, new_context); |
| 5680 | } |
Stefan Hajnoczi | 13af91e | 2014-05-14 16:22:45 +0200 | [diff] [blame] | 5681 | if (bs->io_limits_enabled) { |
| 5682 | throttle_attach_aio_context(&bs->throttle_state, new_context); |
| 5683 | } |
Stefan Hajnoczi | dcd0422 | 2014-05-08 16:34:37 +0200 | [diff] [blame] | 5684 | } |
| 5685 | |
| 5686 | void bdrv_set_aio_context(BlockDriverState *bs, AioContext *new_context) |
| 5687 | { |
| 5688 | bdrv_drain_all(); /* ensure there are no in-flight requests */ |
| 5689 | |
| 5690 | bdrv_detach_aio_context(bs); |
| 5691 | |
| 5692 | /* This function executes in the old AioContext so acquire the new one in |
| 5693 | * case it runs in a different thread. |
| 5694 | */ |
| 5695 | aio_context_acquire(new_context); |
| 5696 | bdrv_attach_aio_context(bs, new_context); |
| 5697 | aio_context_release(new_context); |
Stefan Hajnoczi | 85d126f | 2013-03-07 13:41:48 +0100 | [diff] [blame] | 5698 | } |
Stefan Hajnoczi | d616b22 | 2013-06-24 17:13:10 +0200 | [diff] [blame] | 5699 | |
| 5700 | void bdrv_add_before_write_notifier(BlockDriverState *bs, |
| 5701 | NotifierWithReturn *notifier) |
| 5702 | { |
| 5703 | notifier_with_return_list_add(&bs->before_write_notifiers, notifier); |
| 5704 | } |
Max Reitz | 6f176b4 | 2013-09-03 10:09:50 +0200 | [diff] [blame] | 5705 | |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 5706 | int bdrv_amend_options(BlockDriverState *bs, QemuOpts *opts) |
Max Reitz | 6f176b4 | 2013-09-03 10:09:50 +0200 | [diff] [blame] | 5707 | { |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 5708 | if (!bs->drv->bdrv_amend_options) { |
Max Reitz | 6f176b4 | 2013-09-03 10:09:50 +0200 | [diff] [blame] | 5709 | return -ENOTSUP; |
| 5710 | } |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 5711 | return bs->drv->bdrv_amend_options(bs, opts); |
Max Reitz | 6f176b4 | 2013-09-03 10:09:50 +0200 | [diff] [blame] | 5712 | } |
Benoît Canet | f6186f4 | 2013-10-02 14:33:48 +0200 | [diff] [blame] | 5713 | |
Benoît Canet | b5042a3 | 2014-03-03 19:11:34 +0100 | [diff] [blame] | 5714 | /* This function will be called by the bdrv_recurse_is_first_non_filter method |
| 5715 | * of block filter and by bdrv_is_first_non_filter. |
| 5716 | * It is used to test if the given bs is the candidate or recurse more in the |
| 5717 | * node graph. |
Benoît Canet | 212a5a8 | 2014-01-23 21:31:36 +0100 | [diff] [blame] | 5718 | */ |
Benoît Canet | 212a5a8 | 2014-01-23 21:31:36 +0100 | [diff] [blame] | 5719 | bool bdrv_recurse_is_first_non_filter(BlockDriverState *bs, |
| 5720 | BlockDriverState *candidate) |
Benoît Canet | f6186f4 | 2013-10-02 14:33:48 +0200 | [diff] [blame] | 5721 | { |
Benoît Canet | b5042a3 | 2014-03-03 19:11:34 +0100 | [diff] [blame] | 5722 | /* return false if basic checks fails */ |
| 5723 | if (!bs || !bs->drv) { |
| 5724 | return false; |
| 5725 | } |
| 5726 | |
| 5727 | /* the code reached a non block filter driver -> check if the bs is |
| 5728 | * the same as the candidate. It's the recursion termination condition. |
| 5729 | */ |
| 5730 | if (!bs->drv->is_filter) { |
| 5731 | return bs == candidate; |
| 5732 | } |
| 5733 | /* Down this path the driver is a block filter driver */ |
| 5734 | |
| 5735 | /* If the block filter recursion method is defined use it to recurse down |
| 5736 | * the node graph. |
| 5737 | */ |
| 5738 | if (bs->drv->bdrv_recurse_is_first_non_filter) { |
Benoît Canet | 212a5a8 | 2014-01-23 21:31:36 +0100 | [diff] [blame] | 5739 | return bs->drv->bdrv_recurse_is_first_non_filter(bs, candidate); |
| 5740 | } |
| 5741 | |
Benoît Canet | b5042a3 | 2014-03-03 19:11:34 +0100 | [diff] [blame] | 5742 | /* the driver is a block filter but don't allow to recurse -> return false |
| 5743 | */ |
| 5744 | return false; |
Benoît Canet | 212a5a8 | 2014-01-23 21:31:36 +0100 | [diff] [blame] | 5745 | } |
| 5746 | |
| 5747 | /* This function checks if the candidate is the first non filter bs down it's |
| 5748 | * bs chain. Since we don't have pointers to parents it explore all bs chains |
| 5749 | * from the top. Some filters can choose not to pass down the recursion. |
| 5750 | */ |
| 5751 | bool bdrv_is_first_non_filter(BlockDriverState *candidate) |
| 5752 | { |
| 5753 | BlockDriverState *bs; |
| 5754 | |
| 5755 | /* walk down the bs forest recursively */ |
| 5756 | QTAILQ_FOREACH(bs, &bdrv_states, device_list) { |
| 5757 | bool perm; |
| 5758 | |
Benoît Canet | b5042a3 | 2014-03-03 19:11:34 +0100 | [diff] [blame] | 5759 | /* try to recurse in this top level bs */ |
Kevin Wolf | e6dc8a1 | 2014-02-04 11:45:31 +0100 | [diff] [blame] | 5760 | perm = bdrv_recurse_is_first_non_filter(bs, candidate); |
Benoît Canet | 212a5a8 | 2014-01-23 21:31:36 +0100 | [diff] [blame] | 5761 | |
| 5762 | /* candidate is the first non filter */ |
| 5763 | if (perm) { |
| 5764 | return true; |
| 5765 | } |
| 5766 | } |
| 5767 | |
| 5768 | return false; |
Benoît Canet | f6186f4 | 2013-10-02 14:33:48 +0200 | [diff] [blame] | 5769 | } |
Benoît Canet | 09158f0 | 2014-06-27 18:25:25 +0200 | [diff] [blame] | 5770 | |
| 5771 | BlockDriverState *check_to_replace_node(const char *node_name, Error **errp) |
| 5772 | { |
| 5773 | BlockDriverState *to_replace_bs = bdrv_find_node(node_name); |
| 5774 | if (!to_replace_bs) { |
| 5775 | error_setg(errp, "Node name '%s' not found", node_name); |
| 5776 | return NULL; |
| 5777 | } |
| 5778 | |
| 5779 | if (bdrv_op_is_blocked(to_replace_bs, BLOCK_OP_TYPE_REPLACE, errp)) { |
| 5780 | return NULL; |
| 5781 | } |
| 5782 | |
| 5783 | /* We don't want arbitrary node of the BDS chain to be replaced only the top |
| 5784 | * most non filter in order to prevent data corruption. |
| 5785 | * Another benefit is that this tests exclude backing files which are |
| 5786 | * blocked by the backing blockers. |
| 5787 | */ |
| 5788 | if (!bdrv_is_first_non_filter(to_replace_bs)) { |
| 5789 | error_setg(errp, "Only top most non filter can be replaced"); |
| 5790 | return NULL; |
| 5791 | } |
| 5792 | |
| 5793 | return to_replace_bs; |
| 5794 | } |