ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 1 | /* |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 2 | * Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws> |
| 3 | * |
| 4 | * Network Block Device |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; under version 2 of the License. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
Blue Swirl | 8167ee8 | 2009-07-16 20:47:01 +0000 | [diff] [blame] | 16 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 17 | */ |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 18 | |
Paolo Bonzini | 737e150 | 2012-12-17 18:19:44 +0100 | [diff] [blame] | 19 | #include "block/nbd.h" |
Max Reitz | e140177 | 2014-11-18 12:21:17 +0100 | [diff] [blame] | 20 | #include "sysemu/block-backend.h" |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 21 | |
Daniel P. Berrange | 10817bf | 2015-09-01 14:48:02 +0100 | [diff] [blame] | 22 | #include "qemu/coroutine.h" |
Paolo Bonzini | 262db38 | 2011-09-19 15:19:27 +0200 | [diff] [blame] | 23 | |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 24 | #include <errno.h> |
| 25 | #include <string.h> |
aliguori | 03ff3ca | 2008-09-15 15:51:35 +0000 | [diff] [blame] | 26 | #ifndef _WIN32 |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 27 | #include <sys/ioctl.h> |
aliguori | 03ff3ca | 2008-09-15 15:51:35 +0000 | [diff] [blame] | 28 | #endif |
Andreas Färber | 5dc2eec | 2010-09-20 00:50:46 +0200 | [diff] [blame] | 29 | #if defined(__sun__) || defined(__HAIKU__) |
aliguori | 7e00eb9 | 2008-08-02 01:57:02 +0000 | [diff] [blame] | 30 | #include <sys/ioccom.h> |
| 31 | #endif |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 32 | #include <ctype.h> |
| 33 | #include <inttypes.h> |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 34 | |
Paolo Bonzini | b90fb4b | 2011-09-08 17:24:54 +0200 | [diff] [blame] | 35 | #ifdef __linux__ |
| 36 | #include <linux/fs.h> |
| 37 | #endif |
| 38 | |
Paolo Bonzini | 1de7afc | 2012-12-17 18:20:00 +0100 | [diff] [blame] | 39 | #include "qemu/sockets.h" |
| 40 | #include "qemu/queue.h" |
Alex Bligh | 6a1751b | 2013-08-21 16:02:47 +0100 | [diff] [blame] | 41 | #include "qemu/main-loop.h" |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 42 | |
aliguori | 03ff3ca | 2008-09-15 15:51:35 +0000 | [diff] [blame] | 43 | //#define DEBUG_NBD |
| 44 | |
| 45 | #ifdef DEBUG_NBD |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 46 | #define TRACE(msg, ...) do { \ |
aliguori | 03ff3ca | 2008-09-15 15:51:35 +0000 | [diff] [blame] | 47 | LOG(msg, ## __VA_ARGS__); \ |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 48 | } while(0) |
aliguori | 03ff3ca | 2008-09-15 15:51:35 +0000 | [diff] [blame] | 49 | #else |
| 50 | #define TRACE(msg, ...) \ |
| 51 | do { } while (0) |
| 52 | #endif |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 53 | |
| 54 | #define LOG(msg, ...) do { \ |
| 55 | fprintf(stderr, "%s:%s():L%d: " msg "\n", \ |
| 56 | __FILE__, __FUNCTION__, __LINE__, ## __VA_ARGS__); \ |
| 57 | } while(0) |
| 58 | |
Hani Benhabiles | f5076b5 | 2014-06-07 01:32:31 +0100 | [diff] [blame] | 59 | /* This is all part of the "official" NBD API. |
| 60 | * |
| 61 | * The most up-to-date documentation is available at: |
| 62 | * https://github.com/yoe/nbd/blob/master/doc/proto.txt |
| 63 | */ |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 64 | |
Paolo Bonzini | fa26c26 | 2012-08-22 15:13:30 +0200 | [diff] [blame] | 65 | #define NBD_REQUEST_SIZE (4 + 4 + 8 + 8 + 4) |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 66 | #define NBD_REPLY_SIZE (4 + 4 + 8) |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 67 | #define NBD_REQUEST_MAGIC 0x25609513 |
| 68 | #define NBD_REPLY_MAGIC 0x67446698 |
Paolo Bonzini | fa26c26 | 2012-08-22 15:13:30 +0200 | [diff] [blame] | 69 | #define NBD_OPTS_MAGIC 0x49484156454F5054LL |
| 70 | #define NBD_CLIENT_MAGIC 0x0000420281861253LL |
Hani Benhabiles | f5076b5 | 2014-06-07 01:32:31 +0100 | [diff] [blame] | 71 | #define NBD_REP_MAGIC 0x3e889045565a9LL |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 72 | |
| 73 | #define NBD_SET_SOCK _IO(0xab, 0) |
| 74 | #define NBD_SET_BLKSIZE _IO(0xab, 1) |
| 75 | #define NBD_SET_SIZE _IO(0xab, 2) |
| 76 | #define NBD_DO_IT _IO(0xab, 3) |
| 77 | #define NBD_CLEAR_SOCK _IO(0xab, 4) |
| 78 | #define NBD_CLEAR_QUE _IO(0xab, 5) |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 79 | #define NBD_PRINT_DEBUG _IO(0xab, 6) |
| 80 | #define NBD_SET_SIZE_BLOCKS _IO(0xab, 7) |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 81 | #define NBD_DISCONNECT _IO(0xab, 8) |
Paolo Bonzini | bbb74ed | 2011-09-08 17:24:55 +0200 | [diff] [blame] | 82 | #define NBD_SET_TIMEOUT _IO(0xab, 9) |
| 83 | #define NBD_SET_FLAGS _IO(0xab, 10) |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 84 | |
Hani Benhabiles | f5076b5 | 2014-06-07 01:32:31 +0100 | [diff] [blame] | 85 | #define NBD_OPT_EXPORT_NAME (1) |
| 86 | #define NBD_OPT_ABORT (2) |
Hani Benhabiles | 32d7d2e | 2014-06-07 01:32:32 +0100 | [diff] [blame] | 87 | #define NBD_OPT_LIST (3) |
Laurent Vivier | 1d45f8b | 2010-08-25 22:48:33 +0200 | [diff] [blame] | 88 | |
Paolo Bonzini | ca44148 | 2015-05-07 17:25:10 +0200 | [diff] [blame] | 89 | /* NBD errors are based on errno numbers, so there is a 1:1 mapping, |
| 90 | * but only a limited set of errno values is specified in the protocol. |
| 91 | * Everything else is squashed to EINVAL. |
| 92 | */ |
| 93 | #define NBD_SUCCESS 0 |
| 94 | #define NBD_EPERM 1 |
| 95 | #define NBD_EIO 5 |
| 96 | #define NBD_ENOMEM 12 |
| 97 | #define NBD_EINVAL 22 |
| 98 | #define NBD_ENOSPC 28 |
| 99 | |
| 100 | static int system_errno_to_nbd_errno(int err) |
| 101 | { |
| 102 | switch (err) { |
| 103 | case 0: |
| 104 | return NBD_SUCCESS; |
| 105 | case EPERM: |
| 106 | return NBD_EPERM; |
| 107 | case EIO: |
| 108 | return NBD_EIO; |
| 109 | case ENOMEM: |
| 110 | return NBD_ENOMEM; |
| 111 | #ifdef EDQUOT |
| 112 | case EDQUOT: |
| 113 | #endif |
| 114 | case EFBIG: |
| 115 | case ENOSPC: |
| 116 | return NBD_ENOSPC; |
| 117 | case EINVAL: |
| 118 | default: |
| 119 | return NBD_EINVAL; |
| 120 | } |
| 121 | } |
| 122 | |
| 123 | static int nbd_errno_to_system_errno(int err) |
| 124 | { |
| 125 | switch (err) { |
| 126 | case NBD_SUCCESS: |
| 127 | return 0; |
| 128 | case NBD_EPERM: |
| 129 | return EPERM; |
| 130 | case NBD_EIO: |
| 131 | return EIO; |
| 132 | case NBD_ENOMEM: |
| 133 | return ENOMEM; |
| 134 | case NBD_ENOSPC: |
| 135 | return ENOSPC; |
| 136 | case NBD_EINVAL: |
| 137 | default: |
| 138 | return EINVAL; |
| 139 | } |
| 140 | } |
| 141 | |
Paolo Bonzini | 9a304d2 | 2012-08-22 15:30:31 +0200 | [diff] [blame] | 142 | /* Definitions for opaque data types */ |
| 143 | |
| 144 | typedef struct NBDRequest NBDRequest; |
| 145 | |
| 146 | struct NBDRequest { |
| 147 | QSIMPLEQ_ENTRY(NBDRequest) entry; |
| 148 | NBDClient *client; |
| 149 | uint8_t *data; |
| 150 | }; |
| 151 | |
| 152 | struct NBDExport { |
Paolo Bonzini | 2c8d9f0 | 2012-09-18 13:26:25 +0200 | [diff] [blame] | 153 | int refcount; |
Paolo Bonzini | 0ddf08d | 2012-09-18 13:59:03 +0200 | [diff] [blame] | 154 | void (*close)(NBDExport *exp); |
| 155 | |
Max Reitz | aadf99a | 2014-11-18 12:21:18 +0100 | [diff] [blame] | 156 | BlockBackend *blk; |
Paolo Bonzini | ee0a19e | 2012-08-22 15:59:23 +0200 | [diff] [blame] | 157 | char *name; |
Paolo Bonzini | 9a304d2 | 2012-08-22 15:30:31 +0200 | [diff] [blame] | 158 | off_t dev_offset; |
| 159 | off_t size; |
| 160 | uint32_t nbdflags; |
Paolo Bonzini | 4b9441f | 2012-09-18 13:58:25 +0200 | [diff] [blame] | 161 | QTAILQ_HEAD(, NBDClient) clients; |
Paolo Bonzini | ee0a19e | 2012-08-22 15:59:23 +0200 | [diff] [blame] | 162 | QTAILQ_ENTRY(NBDExport) next; |
Max Reitz | 958c717 | 2014-06-20 21:57:32 +0200 | [diff] [blame] | 163 | |
| 164 | AioContext *ctx; |
Paolo Bonzini | 9a304d2 | 2012-08-22 15:30:31 +0200 | [diff] [blame] | 165 | }; |
| 166 | |
Paolo Bonzini | ee0a19e | 2012-08-22 15:59:23 +0200 | [diff] [blame] | 167 | static QTAILQ_HEAD(, NBDExport) exports = QTAILQ_HEAD_INITIALIZER(exports); |
| 168 | |
Paolo Bonzini | 9a304d2 | 2012-08-22 15:30:31 +0200 | [diff] [blame] | 169 | struct NBDClient { |
| 170 | int refcount; |
| 171 | void (*close)(NBDClient *client); |
| 172 | |
| 173 | NBDExport *exp; |
| 174 | int sock; |
| 175 | |
| 176 | Coroutine *recv_coroutine; |
| 177 | |
| 178 | CoMutex send_lock; |
| 179 | Coroutine *send_coroutine; |
| 180 | |
Max Reitz | 958c717 | 2014-06-20 21:57:32 +0200 | [diff] [blame] | 181 | bool can_read; |
| 182 | |
Paolo Bonzini | 4b9441f | 2012-09-18 13:58:25 +0200 | [diff] [blame] | 183 | QTAILQ_ENTRY(NBDClient) next; |
Paolo Bonzini | 9a304d2 | 2012-08-22 15:30:31 +0200 | [diff] [blame] | 184 | int nb_requests; |
Paolo Bonzini | ff2b68a | 2012-08-22 18:45:12 +0200 | [diff] [blame] | 185 | bool closing; |
Paolo Bonzini | 9a304d2 | 2012-08-22 15:30:31 +0200 | [diff] [blame] | 186 | }; |
| 187 | |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 188 | /* That's all folks */ |
| 189 | |
Max Reitz | 958c717 | 2014-06-20 21:57:32 +0200 | [diff] [blame] | 190 | static void nbd_set_handlers(NBDClient *client); |
| 191 | static void nbd_unset_handlers(NBDClient *client); |
| 192 | static void nbd_update_can_read(NBDClient *client); |
| 193 | |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 194 | ssize_t nbd_wr_sync(int fd, void *buffer, size_t size, bool do_read) |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 195 | { |
| 196 | size_t offset = 0; |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 197 | int err; |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 198 | |
Paolo Bonzini | ae255e5 | 2011-09-08 14:28:59 +0200 | [diff] [blame] | 199 | if (qemu_in_coroutine()) { |
| 200 | if (do_read) { |
| 201 | return qemu_co_recv(fd, buffer, size); |
| 202 | } else { |
| 203 | return qemu_co_send(fd, buffer, size); |
| 204 | } |
| 205 | } |
| 206 | |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 207 | while (offset < size) { |
| 208 | ssize_t len; |
| 209 | |
| 210 | if (do_read) { |
Blue Swirl | 00aa004 | 2011-07-23 20:04:29 +0000 | [diff] [blame] | 211 | len = qemu_recv(fd, buffer + offset, size - offset, 0); |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 212 | } else { |
aliguori | 03ff3ca | 2008-09-15 15:51:35 +0000 | [diff] [blame] | 213 | len = send(fd, buffer + offset, size - offset, 0); |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 214 | } |
| 215 | |
Paolo Bonzini | fc19f8a | 2012-03-07 11:05:34 +0100 | [diff] [blame] | 216 | if (len < 0) { |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 217 | err = socket_error(); |
aliguori | 03ff3ca | 2008-09-15 15:51:35 +0000 | [diff] [blame] | 218 | |
Paolo Bonzini | fc19f8a | 2012-03-07 11:05:34 +0100 | [diff] [blame] | 219 | /* recoverable error */ |
Paolo Bonzini | 79d9b65 | 2014-07-09 11:53:09 +0200 | [diff] [blame] | 220 | if (err == EINTR || (offset > 0 && (err == EAGAIN || err == EWOULDBLOCK))) { |
Paolo Bonzini | fc19f8a | 2012-03-07 11:05:34 +0100 | [diff] [blame] | 221 | continue; |
| 222 | } |
| 223 | |
| 224 | /* unrecoverable error */ |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 225 | return -err; |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 226 | } |
| 227 | |
| 228 | /* eof */ |
| 229 | if (len == 0) { |
| 230 | break; |
| 231 | } |
| 232 | |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 233 | offset += len; |
| 234 | } |
| 235 | |
| 236 | return offset; |
| 237 | } |
| 238 | |
Paolo Bonzini | 7fe7b68 | 2012-03-05 09:10:35 +0100 | [diff] [blame] | 239 | static ssize_t read_sync(int fd, void *buffer, size_t size) |
| 240 | { |
| 241 | /* Sockets are kept in blocking mode in the negotiation phase. After |
| 242 | * that, a non-readable socket simply means that another thread stole |
| 243 | * our request/reply. Synchronization is done with recv_coroutine, so |
| 244 | * that this is coroutine-safe. |
| 245 | */ |
| 246 | return nbd_wr_sync(fd, buffer, size, true); |
| 247 | } |
| 248 | |
Max Reitz | 0379f47 | 2015-02-25 13:08:34 -0500 | [diff] [blame] | 249 | static ssize_t drop_sync(int fd, size_t size) |
| 250 | { |
| 251 | ssize_t ret, dropped = size; |
| 252 | uint8_t *buffer = g_malloc(MIN(65536, size)); |
| 253 | |
| 254 | while (size > 0) { |
| 255 | ret = read_sync(fd, buffer, MIN(65536, size)); |
| 256 | if (ret < 0) { |
| 257 | g_free(buffer); |
| 258 | return ret; |
| 259 | } |
| 260 | |
| 261 | assert(ret <= size); |
| 262 | size -= ret; |
| 263 | } |
| 264 | |
| 265 | g_free(buffer); |
| 266 | return dropped; |
| 267 | } |
| 268 | |
Paolo Bonzini | 7fe7b68 | 2012-03-05 09:10:35 +0100 | [diff] [blame] | 269 | static ssize_t write_sync(int fd, void *buffer, size_t size) |
| 270 | { |
| 271 | int ret; |
| 272 | do { |
| 273 | /* For writes, we do expect the socket to be writable. */ |
| 274 | ret = nbd_wr_sync(fd, buffer, size, false); |
| 275 | } while (ret == -EAGAIN); |
| 276 | return ret; |
| 277 | } |
| 278 | |
Paolo Bonzini | 6b8c01e | 2012-08-23 14:57:11 +0200 | [diff] [blame] | 279 | /* Basic flow for negotiation |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 280 | |
| 281 | Server Client |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 282 | Negotiate |
Paolo Bonzini | 6b8c01e | 2012-08-23 14:57:11 +0200 | [diff] [blame] | 283 | |
| 284 | or |
| 285 | |
| 286 | Server Client |
| 287 | Negotiate #1 |
| 288 | Option |
| 289 | Negotiate #2 |
| 290 | |
| 291 | ---- |
| 292 | |
| 293 | followed by |
| 294 | |
| 295 | Server Client |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 296 | Request |
| 297 | Response |
| 298 | Request |
| 299 | Response |
| 300 | ... |
| 301 | ... |
| 302 | Request (type == 2) |
Paolo Bonzini | 6b8c01e | 2012-08-23 14:57:11 +0200 | [diff] [blame] | 303 | |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 304 | */ |
| 305 | |
Hani Benhabiles | f5076b5 | 2014-06-07 01:32:31 +0100 | [diff] [blame] | 306 | static int nbd_send_rep(int csock, uint32_t type, uint32_t opt) |
Paolo Bonzini | 6b8c01e | 2012-08-23 14:57:11 +0200 | [diff] [blame] | 307 | { |
Paolo Bonzini | 6b8c01e | 2012-08-23 14:57:11 +0200 | [diff] [blame] | 308 | uint64_t magic; |
Hani Benhabiles | f5076b5 | 2014-06-07 01:32:31 +0100 | [diff] [blame] | 309 | uint32_t len; |
| 310 | |
| 311 | magic = cpu_to_be64(NBD_REP_MAGIC); |
| 312 | if (write_sync(csock, &magic, sizeof(magic)) != sizeof(magic)) { |
| 313 | LOG("write failed (rep magic)"); |
| 314 | return -EINVAL; |
| 315 | } |
| 316 | opt = cpu_to_be32(opt); |
| 317 | if (write_sync(csock, &opt, sizeof(opt)) != sizeof(opt)) { |
| 318 | LOG("write failed (rep opt)"); |
| 319 | return -EINVAL; |
| 320 | } |
| 321 | type = cpu_to_be32(type); |
| 322 | if (write_sync(csock, &type, sizeof(type)) != sizeof(type)) { |
| 323 | LOG("write failed (rep type)"); |
| 324 | return -EINVAL; |
| 325 | } |
| 326 | len = cpu_to_be32(0); |
| 327 | if (write_sync(csock, &len, sizeof(len)) != sizeof(len)) { |
| 328 | LOG("write failed (rep data length)"); |
| 329 | return -EINVAL; |
| 330 | } |
| 331 | return 0; |
| 332 | } |
| 333 | |
Hani Benhabiles | 32d7d2e | 2014-06-07 01:32:32 +0100 | [diff] [blame] | 334 | static int nbd_send_rep_list(int csock, NBDExport *exp) |
| 335 | { |
| 336 | uint64_t magic, name_len; |
| 337 | uint32_t opt, type, len; |
| 338 | |
| 339 | name_len = strlen(exp->name); |
| 340 | magic = cpu_to_be64(NBD_REP_MAGIC); |
| 341 | if (write_sync(csock, &magic, sizeof(magic)) != sizeof(magic)) { |
| 342 | LOG("write failed (magic)"); |
| 343 | return -EINVAL; |
| 344 | } |
| 345 | opt = cpu_to_be32(NBD_OPT_LIST); |
| 346 | if (write_sync(csock, &opt, sizeof(opt)) != sizeof(opt)) { |
| 347 | LOG("write failed (opt)"); |
| 348 | return -EINVAL; |
| 349 | } |
| 350 | type = cpu_to_be32(NBD_REP_SERVER); |
| 351 | if (write_sync(csock, &type, sizeof(type)) != sizeof(type)) { |
| 352 | LOG("write failed (reply type)"); |
| 353 | return -EINVAL; |
| 354 | } |
| 355 | len = cpu_to_be32(name_len + sizeof(len)); |
| 356 | if (write_sync(csock, &len, sizeof(len)) != sizeof(len)) { |
| 357 | LOG("write failed (length)"); |
| 358 | return -EINVAL; |
| 359 | } |
| 360 | len = cpu_to_be32(name_len); |
| 361 | if (write_sync(csock, &len, sizeof(len)) != sizeof(len)) { |
| 362 | LOG("write failed (length)"); |
| 363 | return -EINVAL; |
| 364 | } |
| 365 | if (write_sync(csock, exp->name, name_len) != name_len) { |
| 366 | LOG("write failed (buffer)"); |
| 367 | return -EINVAL; |
| 368 | } |
| 369 | return 0; |
| 370 | } |
| 371 | |
| 372 | static int nbd_handle_list(NBDClient *client, uint32_t length) |
| 373 | { |
| 374 | int csock; |
| 375 | NBDExport *exp; |
| 376 | |
| 377 | csock = client->sock; |
| 378 | if (length) { |
Max Reitz | 0379f47 | 2015-02-25 13:08:34 -0500 | [diff] [blame] | 379 | if (drop_sync(csock, length) != length) { |
| 380 | return -EIO; |
| 381 | } |
Hani Benhabiles | 32d7d2e | 2014-06-07 01:32:32 +0100 | [diff] [blame] | 382 | return nbd_send_rep(csock, NBD_REP_ERR_INVALID, NBD_OPT_LIST); |
| 383 | } |
| 384 | |
| 385 | /* For each export, send a NBD_REP_SERVER reply. */ |
| 386 | QTAILQ_FOREACH(exp, &exports, next) { |
| 387 | if (nbd_send_rep_list(csock, exp)) { |
| 388 | return -EINVAL; |
| 389 | } |
| 390 | } |
| 391 | /* Finish with a NBD_REP_ACK. */ |
| 392 | return nbd_send_rep(csock, NBD_REP_ACK, NBD_OPT_LIST); |
| 393 | } |
| 394 | |
Hani Benhabiles | f5076b5 | 2014-06-07 01:32:31 +0100 | [diff] [blame] | 395 | static int nbd_handle_export_name(NBDClient *client, uint32_t length) |
| 396 | { |
| 397 | int rc = -EINVAL, csock = client->sock; |
| 398 | char name[256]; |
Paolo Bonzini | 6b8c01e | 2012-08-23 14:57:11 +0200 | [diff] [blame] | 399 | |
| 400 | /* Client sends: |
Paolo Bonzini | 6b8c01e | 2012-08-23 14:57:11 +0200 | [diff] [blame] | 401 | [20 .. xx] export name (length bytes) |
| 402 | */ |
Paolo Bonzini | 6b8c01e | 2012-08-23 14:57:11 +0200 | [diff] [blame] | 403 | TRACE("Checking length"); |
Paolo Bonzini | 6b8c01e | 2012-08-23 14:57:11 +0200 | [diff] [blame] | 404 | if (length > 255) { |
| 405 | LOG("Bad length received"); |
| 406 | goto fail; |
| 407 | } |
| 408 | if (read_sync(csock, name, length) != length) { |
| 409 | LOG("read failed"); |
| 410 | goto fail; |
| 411 | } |
| 412 | name[length] = '\0'; |
| 413 | |
| 414 | client->exp = nbd_export_find(name); |
| 415 | if (!client->exp) { |
| 416 | LOG("export not found"); |
| 417 | goto fail; |
| 418 | } |
| 419 | |
| 420 | QTAILQ_INSERT_TAIL(&client->exp->clients, client, next); |
| 421 | nbd_export_get(client->exp); |
Paolo Bonzini | 6b8c01e | 2012-08-23 14:57:11 +0200 | [diff] [blame] | 422 | rc = 0; |
| 423 | fail: |
| 424 | return rc; |
| 425 | } |
| 426 | |
Hani Benhabiles | f5076b5 | 2014-06-07 01:32:31 +0100 | [diff] [blame] | 427 | static int nbd_receive_options(NBDClient *client) |
| 428 | { |
Max Reitz | 9c122ad | 2015-02-25 13:08:31 -0500 | [diff] [blame] | 429 | int csock = client->sock; |
| 430 | uint32_t flags; |
| 431 | |
| 432 | /* Client sends: |
| 433 | [ 0 .. 3] client flags |
| 434 | |
| 435 | [ 0 .. 7] NBD_OPTS_MAGIC |
| 436 | [ 8 .. 11] NBD option |
| 437 | [12 .. 15] Data length |
| 438 | ... Rest of request |
| 439 | |
| 440 | [ 0 .. 7] NBD_OPTS_MAGIC |
| 441 | [ 8 .. 11] Second NBD option |
| 442 | [12 .. 15] Data length |
| 443 | ... Rest of request |
| 444 | */ |
| 445 | |
| 446 | if (read_sync(csock, &flags, sizeof(flags)) != sizeof(flags)) { |
| 447 | LOG("read failed"); |
| 448 | return -EIO; |
| 449 | } |
| 450 | TRACE("Checking client flags"); |
| 451 | be32_to_cpus(&flags); |
| 452 | if (flags != 0 && flags != NBD_FLAG_C_FIXED_NEWSTYLE) { |
| 453 | LOG("Bad client flags received"); |
| 454 | return -EIO; |
| 455 | } |
| 456 | |
Hani Benhabiles | f5076b5 | 2014-06-07 01:32:31 +0100 | [diff] [blame] | 457 | while (1) { |
Max Reitz | 9c122ad | 2015-02-25 13:08:31 -0500 | [diff] [blame] | 458 | int ret; |
Hani Benhabiles | f5076b5 | 2014-06-07 01:32:31 +0100 | [diff] [blame] | 459 | uint32_t tmp, length; |
| 460 | uint64_t magic; |
| 461 | |
Hani Benhabiles | f5076b5 | 2014-06-07 01:32:31 +0100 | [diff] [blame] | 462 | if (read_sync(csock, &magic, sizeof(magic)) != sizeof(magic)) { |
| 463 | LOG("read failed"); |
| 464 | return -EINVAL; |
| 465 | } |
| 466 | TRACE("Checking opts magic"); |
| 467 | if (magic != be64_to_cpu(NBD_OPTS_MAGIC)) { |
| 468 | LOG("Bad magic received"); |
| 469 | return -EINVAL; |
| 470 | } |
| 471 | |
| 472 | if (read_sync(csock, &tmp, sizeof(tmp)) != sizeof(tmp)) { |
| 473 | LOG("read failed"); |
| 474 | return -EINVAL; |
| 475 | } |
| 476 | |
| 477 | if (read_sync(csock, &length, sizeof(length)) != sizeof(length)) { |
| 478 | LOG("read failed"); |
| 479 | return -EINVAL; |
| 480 | } |
| 481 | length = be32_to_cpu(length); |
| 482 | |
| 483 | TRACE("Checking option"); |
| 484 | switch (be32_to_cpu(tmp)) { |
Hani Benhabiles | 32d7d2e | 2014-06-07 01:32:32 +0100 | [diff] [blame] | 485 | case NBD_OPT_LIST: |
Max Reitz | 892f5a5 | 2015-02-25 13:08:19 -0500 | [diff] [blame] | 486 | ret = nbd_handle_list(client, length); |
| 487 | if (ret < 0) { |
| 488 | return ret; |
Hani Benhabiles | 32d7d2e | 2014-06-07 01:32:32 +0100 | [diff] [blame] | 489 | } |
| 490 | break; |
| 491 | |
Hani Benhabiles | f5076b5 | 2014-06-07 01:32:31 +0100 | [diff] [blame] | 492 | case NBD_OPT_ABORT: |
| 493 | return -EINVAL; |
| 494 | |
| 495 | case NBD_OPT_EXPORT_NAME: |
| 496 | return nbd_handle_export_name(client, length); |
| 497 | |
| 498 | default: |
| 499 | tmp = be32_to_cpu(tmp); |
| 500 | LOG("Unsupported option 0x%x", tmp); |
| 501 | nbd_send_rep(client->sock, NBD_REP_ERR_UNSUP, tmp); |
| 502 | return -EINVAL; |
| 503 | } |
| 504 | } |
| 505 | } |
| 506 | |
Paolo Bonzini | 9a304d2 | 2012-08-22 15:30:31 +0200 | [diff] [blame] | 507 | static int nbd_send_negotiate(NBDClient *client) |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 508 | { |
Paolo Bonzini | 9a304d2 | 2012-08-22 15:30:31 +0200 | [diff] [blame] | 509 | int csock = client->sock; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 510 | char buf[8 + 8 + 8 + 128]; |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 511 | int rc; |
Paolo Bonzini | 6b8c01e | 2012-08-23 14:57:11 +0200 | [diff] [blame] | 512 | const int myflags = (NBD_FLAG_HAS_FLAGS | NBD_FLAG_SEND_TRIM | |
| 513 | NBD_FLAG_SEND_FLUSH | NBD_FLAG_SEND_FUA); |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 514 | |
Paolo Bonzini | 6b8c01e | 2012-08-23 14:57:11 +0200 | [diff] [blame] | 515 | /* Negotiation header without options: |
| 516 | [ 0 .. 7] passwd ("NBDMAGIC") |
| 517 | [ 8 .. 15] magic (NBD_CLIENT_MAGIC) |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 518 | [16 .. 23] size |
Paolo Bonzini | 6b8c01e | 2012-08-23 14:57:11 +0200 | [diff] [blame] | 519 | [24 .. 25] server flags (0) |
Hani Benhabiles | 5672ee5 | 2014-05-13 00:35:16 +0100 | [diff] [blame] | 520 | [26 .. 27] export flags |
Paolo Bonzini | 6b8c01e | 2012-08-23 14:57:11 +0200 | [diff] [blame] | 521 | [28 .. 151] reserved (0) |
| 522 | |
| 523 | Negotiation header with options, part 1: |
| 524 | [ 0 .. 7] passwd ("NBDMAGIC") |
| 525 | [ 8 .. 15] magic (NBD_OPTS_MAGIC) |
| 526 | [16 .. 17] server flags (0) |
| 527 | |
| 528 | part 2 (after options are sent): |
| 529 | [18 .. 25] size |
| 530 | [26 .. 27] export flags |
| 531 | [28 .. 151] reserved (0) |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 532 | */ |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 533 | |
Stefan Hajnoczi | f9e8cac | 2013-03-27 10:10:43 +0100 | [diff] [blame] | 534 | qemu_set_block(csock); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 535 | rc = -EINVAL; |
| 536 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 537 | TRACE("Beginning negotiation."); |
Paolo Bonzini | 8ffaaba | 2012-11-26 15:19:31 +0100 | [diff] [blame] | 538 | memset(buf, 0, sizeof(buf)); |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 539 | memcpy(buf, "NBDMAGIC", 8); |
Paolo Bonzini | 6b8c01e | 2012-08-23 14:57:11 +0200 | [diff] [blame] | 540 | if (client->exp) { |
| 541 | assert ((client->exp->nbdflags & ~65535) == 0); |
| 542 | cpu_to_be64w((uint64_t*)(buf + 8), NBD_CLIENT_MAGIC); |
| 543 | cpu_to_be64w((uint64_t*)(buf + 16), client->exp->size); |
| 544 | cpu_to_be16w((uint16_t*)(buf + 26), client->exp->nbdflags | myflags); |
| 545 | } else { |
| 546 | cpu_to_be64w((uint64_t*)(buf + 8), NBD_OPTS_MAGIC); |
Hani Benhabiles | f5076b5 | 2014-06-07 01:32:31 +0100 | [diff] [blame] | 547 | cpu_to_be16w((uint16_t *)(buf + 16), NBD_FLAG_FIXED_NEWSTYLE); |
Paolo Bonzini | 6b8c01e | 2012-08-23 14:57:11 +0200 | [diff] [blame] | 548 | } |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 549 | |
Paolo Bonzini | 6b8c01e | 2012-08-23 14:57:11 +0200 | [diff] [blame] | 550 | if (client->exp) { |
| 551 | if (write_sync(csock, buf, sizeof(buf)) != sizeof(buf)) { |
| 552 | LOG("write failed"); |
| 553 | goto fail; |
| 554 | } |
| 555 | } else { |
| 556 | if (write_sync(csock, buf, 18) != 18) { |
| 557 | LOG("write failed"); |
| 558 | goto fail; |
| 559 | } |
| 560 | rc = nbd_receive_options(client); |
Hani Benhabiles | f5076b5 | 2014-06-07 01:32:31 +0100 | [diff] [blame] | 561 | if (rc != 0) { |
Paolo Bonzini | 6b8c01e | 2012-08-23 14:57:11 +0200 | [diff] [blame] | 562 | LOG("option negotiation failed"); |
| 563 | goto fail; |
| 564 | } |
| 565 | |
| 566 | assert ((client->exp->nbdflags & ~65535) == 0); |
| 567 | cpu_to_be64w((uint64_t*)(buf + 18), client->exp->size); |
| 568 | cpu_to_be16w((uint16_t*)(buf + 26), client->exp->nbdflags | myflags); |
| 569 | if (write_sync(csock, buf + 18, sizeof(buf) - 18) != sizeof(buf) - 18) { |
| 570 | LOG("write failed"); |
| 571 | goto fail; |
| 572 | } |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 573 | } |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 574 | |
Dong Xu Wang | 07f3507 | 2011-11-22 18:06:26 +0800 | [diff] [blame] | 575 | TRACE("Negotiation succeeded."); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 576 | rc = 0; |
| 577 | fail: |
Stefan Hajnoczi | f9e8cac | 2013-03-27 10:10:43 +0100 | [diff] [blame] | 578 | qemu_set_nonblock(csock); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 579 | return rc; |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 580 | } |
| 581 | |
Laurent Vivier | 1d45f8b | 2010-08-25 22:48:33 +0200 | [diff] [blame] | 582 | int nbd_receive_negotiate(int csock, const char *name, uint32_t *flags, |
Max Reitz | 3f47265 | 2015-02-25 13:08:25 -0500 | [diff] [blame] | 583 | off_t *size, Error **errp) |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 584 | { |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 585 | char buf[256]; |
| 586 | uint64_t magic, s; |
| 587 | uint16_t tmp; |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 588 | int rc; |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 589 | |
Dong Xu Wang | 07f3507 | 2011-11-22 18:06:26 +0800 | [diff] [blame] | 590 | TRACE("Receiving negotiation."); |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 591 | |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 592 | rc = -EINVAL; |
| 593 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 594 | if (read_sync(csock, buf, 8) != 8) { |
Max Reitz | 1ce5284 | 2015-01-26 21:02:59 -0500 | [diff] [blame] | 595 | error_setg(errp, "Failed to read data"); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 596 | goto fail; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 597 | } |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 598 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 599 | buf[8] = '\0'; |
| 600 | if (strlen(buf) == 0) { |
Max Reitz | 1ce5284 | 2015-01-26 21:02:59 -0500 | [diff] [blame] | 601 | error_setg(errp, "Server connection closed unexpectedly"); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 602 | goto fail; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 603 | } |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 604 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 605 | TRACE("Magic is %c%c%c%c%c%c%c%c", |
| 606 | qemu_isprint(buf[0]) ? buf[0] : '.', |
| 607 | qemu_isprint(buf[1]) ? buf[1] : '.', |
| 608 | qemu_isprint(buf[2]) ? buf[2] : '.', |
| 609 | qemu_isprint(buf[3]) ? buf[3] : '.', |
| 610 | qemu_isprint(buf[4]) ? buf[4] : '.', |
| 611 | qemu_isprint(buf[5]) ? buf[5] : '.', |
| 612 | qemu_isprint(buf[6]) ? buf[6] : '.', |
| 613 | qemu_isprint(buf[7]) ? buf[7] : '.'); |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 614 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 615 | if (memcmp(buf, "NBDMAGIC", 8) != 0) { |
Max Reitz | 1ce5284 | 2015-01-26 21:02:59 -0500 | [diff] [blame] | 616 | error_setg(errp, "Invalid magic received"); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 617 | goto fail; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 618 | } |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 619 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 620 | if (read_sync(csock, &magic, sizeof(magic)) != sizeof(magic)) { |
Max Reitz | 1ce5284 | 2015-01-26 21:02:59 -0500 | [diff] [blame] | 621 | error_setg(errp, "Failed to read magic"); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 622 | goto fail; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 623 | } |
| 624 | magic = be64_to_cpu(magic); |
| 625 | TRACE("Magic is 0x%" PRIx64, magic); |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 626 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 627 | if (name) { |
| 628 | uint32_t reserved = 0; |
| 629 | uint32_t opt; |
| 630 | uint32_t namesize; |
Laurent Vivier | 1d45f8b | 2010-08-25 22:48:33 +0200 | [diff] [blame] | 631 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 632 | TRACE("Checking magic (opts_magic)"); |
Paolo Bonzini | fa26c26 | 2012-08-22 15:13:30 +0200 | [diff] [blame] | 633 | if (magic != NBD_OPTS_MAGIC) { |
Max Reitz | 1ce5284 | 2015-01-26 21:02:59 -0500 | [diff] [blame] | 634 | if (magic == NBD_CLIENT_MAGIC) { |
| 635 | error_setg(errp, "Server does not support export names"); |
| 636 | } else { |
| 637 | error_setg(errp, "Bad magic received"); |
| 638 | } |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 639 | goto fail; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 640 | } |
| 641 | if (read_sync(csock, &tmp, sizeof(tmp)) != sizeof(tmp)) { |
Max Reitz | 1ce5284 | 2015-01-26 21:02:59 -0500 | [diff] [blame] | 642 | error_setg(errp, "Failed to read server flags"); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 643 | goto fail; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 644 | } |
| 645 | *flags = be16_to_cpu(tmp) << 16; |
| 646 | /* reserved for future use */ |
| 647 | if (write_sync(csock, &reserved, sizeof(reserved)) != |
| 648 | sizeof(reserved)) { |
Max Reitz | 1ce5284 | 2015-01-26 21:02:59 -0500 | [diff] [blame] | 649 | error_setg(errp, "Failed to read reserved field"); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 650 | goto fail; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 651 | } |
| 652 | /* write the export name */ |
| 653 | magic = cpu_to_be64(magic); |
| 654 | if (write_sync(csock, &magic, sizeof(magic)) != sizeof(magic)) { |
Max Reitz | 1ce5284 | 2015-01-26 21:02:59 -0500 | [diff] [blame] | 655 | error_setg(errp, "Failed to send export name magic"); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 656 | goto fail; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 657 | } |
| 658 | opt = cpu_to_be32(NBD_OPT_EXPORT_NAME); |
| 659 | if (write_sync(csock, &opt, sizeof(opt)) != sizeof(opt)) { |
Max Reitz | 1ce5284 | 2015-01-26 21:02:59 -0500 | [diff] [blame] | 660 | error_setg(errp, "Failed to send export name option number"); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 661 | goto fail; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 662 | } |
| 663 | namesize = cpu_to_be32(strlen(name)); |
| 664 | if (write_sync(csock, &namesize, sizeof(namesize)) != |
| 665 | sizeof(namesize)) { |
Max Reitz | 1ce5284 | 2015-01-26 21:02:59 -0500 | [diff] [blame] | 666 | error_setg(errp, "Failed to send export name length"); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 667 | goto fail; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 668 | } |
| 669 | if (write_sync(csock, (char*)name, strlen(name)) != strlen(name)) { |
Max Reitz | 1ce5284 | 2015-01-26 21:02:59 -0500 | [diff] [blame] | 670 | error_setg(errp, "Failed to send export name"); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 671 | goto fail; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 672 | } |
| 673 | } else { |
| 674 | TRACE("Checking magic (cli_magic)"); |
Laurent Vivier | 1d45f8b | 2010-08-25 22:48:33 +0200 | [diff] [blame] | 675 | |
Paolo Bonzini | fa26c26 | 2012-08-22 15:13:30 +0200 | [diff] [blame] | 676 | if (magic != NBD_CLIENT_MAGIC) { |
Max Reitz | 1ce5284 | 2015-01-26 21:02:59 -0500 | [diff] [blame] | 677 | if (magic == NBD_OPTS_MAGIC) { |
| 678 | error_setg(errp, "Server requires an export name"); |
| 679 | } else { |
| 680 | error_setg(errp, "Bad magic received"); |
| 681 | } |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 682 | goto fail; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 683 | } |
| 684 | } |
Laurent Vivier | 1d45f8b | 2010-08-25 22:48:33 +0200 | [diff] [blame] | 685 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 686 | if (read_sync(csock, &s, sizeof(s)) != sizeof(s)) { |
Max Reitz | 1ce5284 | 2015-01-26 21:02:59 -0500 | [diff] [blame] | 687 | error_setg(errp, "Failed to read export length"); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 688 | goto fail; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 689 | } |
| 690 | *size = be64_to_cpu(s); |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 691 | TRACE("Size is %" PRIu64, *size); |
Laurent Vivier | 1d45f8b | 2010-08-25 22:48:33 +0200 | [diff] [blame] | 692 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 693 | if (!name) { |
| 694 | if (read_sync(csock, flags, sizeof(*flags)) != sizeof(*flags)) { |
Max Reitz | 1ce5284 | 2015-01-26 21:02:59 -0500 | [diff] [blame] | 695 | error_setg(errp, "Failed to read export flags"); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 696 | goto fail; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 697 | } |
| 698 | *flags = be32_to_cpup(flags); |
| 699 | } else { |
| 700 | if (read_sync(csock, &tmp, sizeof(tmp)) != sizeof(tmp)) { |
Max Reitz | 1ce5284 | 2015-01-26 21:02:59 -0500 | [diff] [blame] | 701 | error_setg(errp, "Failed to read export flags"); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 702 | goto fail; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 703 | } |
Max Reitz | 48c7d80 | 2015-02-25 13:08:32 -0500 | [diff] [blame] | 704 | *flags |= be16_to_cpu(tmp); |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 705 | } |
| 706 | if (read_sync(csock, &buf, 124) != 124) { |
Max Reitz | 1ce5284 | 2015-01-26 21:02:59 -0500 | [diff] [blame] | 707 | error_setg(errp, "Failed to read reserved block"); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 708 | goto fail; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 709 | } |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 710 | rc = 0; |
| 711 | |
| 712 | fail: |
| 713 | return rc; |
ths | cd831bd | 2008-07-03 10:23:51 +0000 | [diff] [blame] | 714 | } |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 715 | |
Paolo Bonzini | b90fb4b | 2011-09-08 17:24:54 +0200 | [diff] [blame] | 716 | #ifdef __linux__ |
Max Reitz | 3f47265 | 2015-02-25 13:08:25 -0500 | [diff] [blame] | 717 | int nbd_init(int fd, int csock, uint32_t flags, off_t size) |
ths | cd831bd | 2008-07-03 10:23:51 +0000 | [diff] [blame] | 718 | { |
Chunyan Liu | 3e05c78 | 2011-12-02 23:27:54 +0800 | [diff] [blame] | 719 | TRACE("Setting NBD socket"); |
| 720 | |
Paolo Bonzini | fc19f8a | 2012-03-07 11:05:34 +0100 | [diff] [blame] | 721 | if (ioctl(fd, NBD_SET_SOCK, csock) < 0) { |
Chunyan Liu | 3e05c78 | 2011-12-02 23:27:54 +0800 | [diff] [blame] | 722 | int serrno = errno; |
| 723 | LOG("Failed to set NBD socket"); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 724 | return -serrno; |
Chunyan Liu | 3e05c78 | 2011-12-02 23:27:54 +0800 | [diff] [blame] | 725 | } |
| 726 | |
Max Reitz | 3f47265 | 2015-02-25 13:08:25 -0500 | [diff] [blame] | 727 | TRACE("Setting block size to %lu", (unsigned long)BDRV_SECTOR_SIZE); |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 728 | |
Max Reitz | 3f47265 | 2015-02-25 13:08:25 -0500 | [diff] [blame] | 729 | if (ioctl(fd, NBD_SET_BLKSIZE, (size_t)BDRV_SECTOR_SIZE) < 0) { |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 730 | int serrno = errno; |
| 731 | LOG("Failed setting NBD block size"); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 732 | return -serrno; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 733 | } |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 734 | |
Max Reitz | 3f47265 | 2015-02-25 13:08:25 -0500 | [diff] [blame] | 735 | TRACE("Setting size to %zd block(s)", (size_t)(size / BDRV_SECTOR_SIZE)); |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 736 | |
Bogdan Purcareata | d064d9f | 2015-04-03 11:01:54 +0000 | [diff] [blame] | 737 | if (ioctl(fd, NBD_SET_SIZE_BLOCKS, (size_t)(size / BDRV_SECTOR_SIZE)) < 0) { |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 738 | int serrno = errno; |
| 739 | LOG("Failed setting size (in blocks)"); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 740 | return -serrno; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 741 | } |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 742 | |
Paolo Bonzini | c8969ed | 2012-11-13 10:34:17 +0100 | [diff] [blame] | 743 | if (ioctl(fd, NBD_SET_FLAGS, flags) < 0) { |
| 744 | if (errno == ENOTTY) { |
| 745 | int read_only = (flags & NBD_FLAG_READ_ONLY) != 0; |
| 746 | TRACE("Setting readonly attribute"); |
Paolo Bonzini | b90fb4b | 2011-09-08 17:24:54 +0200 | [diff] [blame] | 747 | |
Paolo Bonzini | c8969ed | 2012-11-13 10:34:17 +0100 | [diff] [blame] | 748 | if (ioctl(fd, BLKROSET, (unsigned long) &read_only) < 0) { |
| 749 | int serrno = errno; |
| 750 | LOG("Failed setting read-only attribute"); |
| 751 | return -serrno; |
| 752 | } |
| 753 | } else { |
Paolo Bonzini | b90fb4b | 2011-09-08 17:24:54 +0200 | [diff] [blame] | 754 | int serrno = errno; |
Paolo Bonzini | c8969ed | 2012-11-13 10:34:17 +0100 | [diff] [blame] | 755 | LOG("Failed setting flags"); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 756 | return -serrno; |
Paolo Bonzini | b90fb4b | 2011-09-08 17:24:54 +0200 | [diff] [blame] | 757 | } |
| 758 | } |
| 759 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 760 | TRACE("Negotiation ended"); |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 761 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 762 | return 0; |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 763 | } |
| 764 | |
| 765 | int nbd_disconnect(int fd) |
| 766 | { |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 767 | ioctl(fd, NBD_CLEAR_QUE); |
| 768 | ioctl(fd, NBD_DISCONNECT); |
| 769 | ioctl(fd, NBD_CLEAR_SOCK); |
| 770 | return 0; |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 771 | } |
| 772 | |
Jes Sorensen | 0a4eb86 | 2010-08-31 09:30:33 +0200 | [diff] [blame] | 773 | int nbd_client(int fd) |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 774 | { |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 775 | int ret; |
| 776 | int serrno; |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 777 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 778 | TRACE("Doing NBD loop"); |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 779 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 780 | ret = ioctl(fd, NBD_DO_IT); |
Paolo Bonzini | fc19f8a | 2012-03-07 11:05:34 +0100 | [diff] [blame] | 781 | if (ret < 0 && errno == EPIPE) { |
Paolo Bonzini | 7462468 | 2011-11-04 15:51:18 +0100 | [diff] [blame] | 782 | /* NBD_DO_IT normally returns EPIPE when someone has disconnected |
| 783 | * the socket via NBD_DISCONNECT. We do not want to return 1 in |
| 784 | * that case. |
| 785 | */ |
| 786 | ret = 0; |
| 787 | } |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 788 | serrno = errno; |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 789 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 790 | TRACE("NBD loop returned %d: %s", ret, strerror(serrno)); |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 791 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 792 | TRACE("Clearing NBD queue"); |
| 793 | ioctl(fd, NBD_CLEAR_QUE); |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 794 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 795 | TRACE("Clearing NBD socket"); |
| 796 | ioctl(fd, NBD_CLEAR_SOCK); |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 797 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 798 | errno = serrno; |
| 799 | return ret; |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 800 | } |
aliguori | 03ff3ca | 2008-09-15 15:51:35 +0000 | [diff] [blame] | 801 | #else |
Max Reitz | 3f47265 | 2015-02-25 13:08:25 -0500 | [diff] [blame] | 802 | int nbd_init(int fd, int csock, uint32_t flags, off_t size) |
aliguori | 03ff3ca | 2008-09-15 15:51:35 +0000 | [diff] [blame] | 803 | { |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 804 | return -ENOTSUP; |
aliguori | 03ff3ca | 2008-09-15 15:51:35 +0000 | [diff] [blame] | 805 | } |
| 806 | |
| 807 | int nbd_disconnect(int fd) |
| 808 | { |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 809 | return -ENOTSUP; |
aliguori | 03ff3ca | 2008-09-15 15:51:35 +0000 | [diff] [blame] | 810 | } |
| 811 | |
Jes Sorensen | 0a4eb86 | 2010-08-31 09:30:33 +0200 | [diff] [blame] | 812 | int nbd_client(int fd) |
aliguori | 03ff3ca | 2008-09-15 15:51:35 +0000 | [diff] [blame] | 813 | { |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 814 | return -ENOTSUP; |
aliguori | 03ff3ca | 2008-09-15 15:51:35 +0000 | [diff] [blame] | 815 | } |
| 816 | #endif |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 817 | |
Paolo Bonzini | 94e7340 | 2012-03-07 11:25:01 +0100 | [diff] [blame] | 818 | ssize_t nbd_send_request(int csock, struct nbd_request *request) |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 819 | { |
Paolo Bonzini | fa26c26 | 2012-08-22 15:13:30 +0200 | [diff] [blame] | 820 | uint8_t buf[NBD_REQUEST_SIZE]; |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 821 | ssize_t ret; |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 822 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 823 | cpu_to_be32w((uint32_t*)buf, NBD_REQUEST_MAGIC); |
| 824 | cpu_to_be32w((uint32_t*)(buf + 4), request->type); |
| 825 | cpu_to_be64w((uint64_t*)(buf + 8), request->handle); |
| 826 | cpu_to_be64w((uint64_t*)(buf + 16), request->from); |
| 827 | cpu_to_be32w((uint32_t*)(buf + 24), request->len); |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 828 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 829 | TRACE("Sending request to client: " |
| 830 | "{ .from = %" PRIu64", .len = %u, .handle = %" PRIu64", .type=%i}", |
| 831 | request->from, request->len, request->handle, request->type); |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 832 | |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 833 | ret = write_sync(csock, buf, sizeof(buf)); |
| 834 | if (ret < 0) { |
| 835 | return ret; |
| 836 | } |
| 837 | |
| 838 | if (ret != sizeof(buf)) { |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 839 | LOG("writing to socket failed"); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 840 | return -EINVAL; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 841 | } |
| 842 | return 0; |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 843 | } |
| 844 | |
Paolo Bonzini | 94e7340 | 2012-03-07 11:25:01 +0100 | [diff] [blame] | 845 | static ssize_t nbd_receive_request(int csock, struct nbd_request *request) |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 846 | { |
Paolo Bonzini | fa26c26 | 2012-08-22 15:13:30 +0200 | [diff] [blame] | 847 | uint8_t buf[NBD_REQUEST_SIZE]; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 848 | uint32_t magic; |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 849 | ssize_t ret; |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 850 | |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 851 | ret = read_sync(csock, buf, sizeof(buf)); |
| 852 | if (ret < 0) { |
| 853 | return ret; |
| 854 | } |
| 855 | |
| 856 | if (ret != sizeof(buf)) { |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 857 | LOG("read failed"); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 858 | return -EINVAL; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 859 | } |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 860 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 861 | /* Request |
| 862 | [ 0 .. 3] magic (NBD_REQUEST_MAGIC) |
| 863 | [ 4 .. 7] type (0 == READ, 1 == WRITE) |
| 864 | [ 8 .. 15] handle |
| 865 | [16 .. 23] from |
| 866 | [24 .. 27] len |
| 867 | */ |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 868 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 869 | magic = be32_to_cpup((uint32_t*)buf); |
| 870 | request->type = be32_to_cpup((uint32_t*)(buf + 4)); |
| 871 | request->handle = be64_to_cpup((uint64_t*)(buf + 8)); |
| 872 | request->from = be64_to_cpup((uint64_t*)(buf + 16)); |
| 873 | request->len = be32_to_cpup((uint32_t*)(buf + 24)); |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 874 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 875 | TRACE("Got request: " |
| 876 | "{ magic = 0x%x, .type = %d, from = %" PRIu64" , len = %u }", |
| 877 | magic, request->type, request->from, request->len); |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 878 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 879 | if (magic != NBD_REQUEST_MAGIC) { |
| 880 | LOG("invalid magic (got 0x%x)", magic); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 881 | return -EINVAL; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 882 | } |
| 883 | return 0; |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 884 | } |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 885 | |
Paolo Bonzini | 94e7340 | 2012-03-07 11:25:01 +0100 | [diff] [blame] | 886 | ssize_t nbd_receive_reply(int csock, struct nbd_reply *reply) |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 887 | { |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 888 | uint8_t buf[NBD_REPLY_SIZE]; |
| 889 | uint32_t magic; |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 890 | ssize_t ret; |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 891 | |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 892 | ret = read_sync(csock, buf, sizeof(buf)); |
| 893 | if (ret < 0) { |
| 894 | return ret; |
| 895 | } |
| 896 | |
| 897 | if (ret != sizeof(buf)) { |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 898 | LOG("read failed"); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 899 | return -EINVAL; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 900 | } |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 901 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 902 | /* Reply |
| 903 | [ 0 .. 3] magic (NBD_REPLY_MAGIC) |
| 904 | [ 4 .. 7] error (0 == no error) |
| 905 | [ 7 .. 15] handle |
| 906 | */ |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 907 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 908 | magic = be32_to_cpup((uint32_t*)buf); |
| 909 | reply->error = be32_to_cpup((uint32_t*)(buf + 4)); |
| 910 | reply->handle = be64_to_cpup((uint64_t*)(buf + 8)); |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 911 | |
Paolo Bonzini | ca44148 | 2015-05-07 17:25:10 +0200 | [diff] [blame] | 912 | reply->error = nbd_errno_to_system_errno(reply->error); |
| 913 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 914 | TRACE("Got reply: " |
| 915 | "{ magic = 0x%x, .error = %d, handle = %" PRIu64" }", |
| 916 | magic, reply->error, reply->handle); |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 917 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 918 | if (magic != NBD_REPLY_MAGIC) { |
| 919 | LOG("invalid magic (got 0x%x)", magic); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 920 | return -EINVAL; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 921 | } |
| 922 | return 0; |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 923 | } |
| 924 | |
Paolo Bonzini | 94e7340 | 2012-03-07 11:25:01 +0100 | [diff] [blame] | 925 | static ssize_t nbd_send_reply(int csock, struct nbd_reply *reply) |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 926 | { |
Paolo Bonzini | fa26c26 | 2012-08-22 15:13:30 +0200 | [diff] [blame] | 927 | uint8_t buf[NBD_REPLY_SIZE]; |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 928 | ssize_t ret; |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 929 | |
Paolo Bonzini | ca44148 | 2015-05-07 17:25:10 +0200 | [diff] [blame] | 930 | reply->error = system_errno_to_nbd_errno(reply->error); |
| 931 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 932 | /* Reply |
| 933 | [ 0 .. 3] magic (NBD_REPLY_MAGIC) |
| 934 | [ 4 .. 7] error (0 == no error) |
| 935 | [ 7 .. 15] handle |
| 936 | */ |
| 937 | cpu_to_be32w((uint32_t*)buf, NBD_REPLY_MAGIC); |
| 938 | cpu_to_be32w((uint32_t*)(buf + 4), reply->error); |
| 939 | cpu_to_be64w((uint64_t*)(buf + 8), reply->handle); |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 940 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 941 | TRACE("Sending response to client"); |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 942 | |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 943 | ret = write_sync(csock, buf, sizeof(buf)); |
| 944 | if (ret < 0) { |
| 945 | return ret; |
| 946 | } |
| 947 | |
| 948 | if (ret != sizeof(buf)) { |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 949 | LOG("writing to socket failed"); |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 950 | return -EINVAL; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 951 | } |
| 952 | return 0; |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 953 | } |
| 954 | |
Paolo Bonzini | 41996e3 | 2011-09-19 15:25:40 +0200 | [diff] [blame] | 955 | #define MAX_NBD_REQUESTS 16 |
| 956 | |
Paolo Bonzini | ce33967 | 2012-09-18 13:17:52 +0200 | [diff] [blame] | 957 | void nbd_client_get(NBDClient *client) |
Paolo Bonzini | 1743b51 | 2011-09-19 14:33:23 +0200 | [diff] [blame] | 958 | { |
| 959 | client->refcount++; |
| 960 | } |
| 961 | |
Paolo Bonzini | ce33967 | 2012-09-18 13:17:52 +0200 | [diff] [blame] | 962 | void nbd_client_put(NBDClient *client) |
Paolo Bonzini | 1743b51 | 2011-09-19 14:33:23 +0200 | [diff] [blame] | 963 | { |
| 964 | if (--client->refcount == 0) { |
Paolo Bonzini | ff2b68a | 2012-08-22 18:45:12 +0200 | [diff] [blame] | 965 | /* The last reference should be dropped by client->close, |
Max Reitz | f53a829 | 2015-02-06 16:06:16 -0500 | [diff] [blame] | 966 | * which is called by client_close. |
Paolo Bonzini | ff2b68a | 2012-08-22 18:45:12 +0200 | [diff] [blame] | 967 | */ |
| 968 | assert(client->closing); |
| 969 | |
Max Reitz | 958c717 | 2014-06-20 21:57:32 +0200 | [diff] [blame] | 970 | nbd_unset_handlers(client); |
Paolo Bonzini | ff2b68a | 2012-08-22 18:45:12 +0200 | [diff] [blame] | 971 | close(client->sock); |
| 972 | client->sock = -1; |
Paolo Bonzini | 6b8c01e | 2012-08-23 14:57:11 +0200 | [diff] [blame] | 973 | if (client->exp) { |
| 974 | QTAILQ_REMOVE(&client->exp->clients, client, next); |
| 975 | nbd_export_put(client->exp); |
| 976 | } |
Paolo Bonzini | 1743b51 | 2011-09-19 14:33:23 +0200 | [diff] [blame] | 977 | g_free(client); |
| 978 | } |
| 979 | } |
| 980 | |
Max Reitz | f53a829 | 2015-02-06 16:06:16 -0500 | [diff] [blame] | 981 | static void client_close(NBDClient *client) |
Paolo Bonzini | 1743b51 | 2011-09-19 14:33:23 +0200 | [diff] [blame] | 982 | { |
Paolo Bonzini | ff2b68a | 2012-08-22 18:45:12 +0200 | [diff] [blame] | 983 | if (client->closing) { |
| 984 | return; |
| 985 | } |
| 986 | |
| 987 | client->closing = true; |
| 988 | |
| 989 | /* Force requests to finish. They will drop their own references, |
| 990 | * then we'll close the socket and free the NBDClient. |
| 991 | */ |
| 992 | shutdown(client->sock, 2); |
| 993 | |
| 994 | /* Also tell the client, so that they release their reference. */ |
Paolo Bonzini | 1743b51 | 2011-09-19 14:33:23 +0200 | [diff] [blame] | 995 | if (client->close) { |
| 996 | client->close(client); |
| 997 | } |
Paolo Bonzini | 1743b51 | 2011-09-19 14:33:23 +0200 | [diff] [blame] | 998 | } |
| 999 | |
Paolo Bonzini | 72deddc | 2011-10-07 16:47:56 +0200 | [diff] [blame] | 1000 | static NBDRequest *nbd_request_get(NBDClient *client) |
Paolo Bonzini | d9a7380 | 2011-09-19 14:18:33 +0200 | [diff] [blame] | 1001 | { |
| 1002 | NBDRequest *req; |
Paolo Bonzini | 72deddc | 2011-10-07 16:47:56 +0200 | [diff] [blame] | 1003 | |
Paolo Bonzini | 41996e3 | 2011-09-19 15:25:40 +0200 | [diff] [blame] | 1004 | assert(client->nb_requests <= MAX_NBD_REQUESTS - 1); |
| 1005 | client->nb_requests++; |
Max Reitz | 958c717 | 2014-06-20 21:57:32 +0200 | [diff] [blame] | 1006 | nbd_update_can_read(client); |
Paolo Bonzini | 41996e3 | 2011-09-19 15:25:40 +0200 | [diff] [blame] | 1007 | |
Paolo Bonzini | 1729404 | 2015-10-01 12:59:08 +0200 | [diff] [blame] | 1008 | req = g_new0(NBDRequest, 1); |
Paolo Bonzini | 72deddc | 2011-10-07 16:47:56 +0200 | [diff] [blame] | 1009 | nbd_client_get(client); |
| 1010 | req->client = client; |
Paolo Bonzini | d9a7380 | 2011-09-19 14:18:33 +0200 | [diff] [blame] | 1011 | return req; |
| 1012 | } |
| 1013 | |
Paolo Bonzini | 72deddc | 2011-10-07 16:47:56 +0200 | [diff] [blame] | 1014 | static void nbd_request_put(NBDRequest *req) |
Paolo Bonzini | d9a7380 | 2011-09-19 14:18:33 +0200 | [diff] [blame] | 1015 | { |
Paolo Bonzini | 72deddc | 2011-10-07 16:47:56 +0200 | [diff] [blame] | 1016 | NBDClient *client = req->client; |
Stefan Hajnoczi | e1adb27 | 2013-05-02 14:23:07 +0200 | [diff] [blame] | 1017 | |
Stefan Hajnoczi | 2d82148 | 2013-05-02 14:23:08 +0200 | [diff] [blame] | 1018 | if (req->data) { |
| 1019 | qemu_vfree(req->data); |
| 1020 | } |
Paolo Bonzini | 1729404 | 2015-10-01 12:59:08 +0200 | [diff] [blame] | 1021 | g_free(req); |
Stefan Hajnoczi | e1adb27 | 2013-05-02 14:23:07 +0200 | [diff] [blame] | 1022 | |
Max Reitz | 958c717 | 2014-06-20 21:57:32 +0200 | [diff] [blame] | 1023 | client->nb_requests--; |
| 1024 | nbd_update_can_read(client); |
Paolo Bonzini | 72deddc | 2011-10-07 16:47:56 +0200 | [diff] [blame] | 1025 | nbd_client_put(client); |
Paolo Bonzini | d9a7380 | 2011-09-19 14:18:33 +0200 | [diff] [blame] | 1026 | } |
| 1027 | |
Max Reitz | aadf99a | 2014-11-18 12:21:18 +0100 | [diff] [blame] | 1028 | static void blk_aio_attached(AioContext *ctx, void *opaque) |
Max Reitz | f214928 | 2014-06-20 21:57:34 +0200 | [diff] [blame] | 1029 | { |
| 1030 | NBDExport *exp = opaque; |
| 1031 | NBDClient *client; |
| 1032 | |
| 1033 | TRACE("Export %s: Attaching clients to AIO context %p\n", exp->name, ctx); |
| 1034 | |
| 1035 | exp->ctx = ctx; |
| 1036 | |
| 1037 | QTAILQ_FOREACH(client, &exp->clients, next) { |
| 1038 | nbd_set_handlers(client); |
| 1039 | } |
| 1040 | } |
| 1041 | |
Max Reitz | aadf99a | 2014-11-18 12:21:18 +0100 | [diff] [blame] | 1042 | static void blk_aio_detach(void *opaque) |
Max Reitz | f214928 | 2014-06-20 21:57:34 +0200 | [diff] [blame] | 1043 | { |
| 1044 | NBDExport *exp = opaque; |
| 1045 | NBDClient *client; |
| 1046 | |
| 1047 | TRACE("Export %s: Detaching clients from AIO context %p\n", exp->name, exp->ctx); |
| 1048 | |
| 1049 | QTAILQ_FOREACH(client, &exp->clients, next) { |
| 1050 | nbd_unset_handlers(client); |
| 1051 | } |
| 1052 | |
| 1053 | exp->ctx = NULL; |
| 1054 | } |
| 1055 | |
Max Reitz | e140177 | 2014-11-18 12:21:17 +0100 | [diff] [blame] | 1056 | NBDExport *nbd_export_new(BlockBackend *blk, off_t dev_offset, off_t size, |
Max Reitz | 98f44bb | 2015-02-25 13:08:21 -0500 | [diff] [blame] | 1057 | uint32_t nbdflags, void (*close)(NBDExport *), |
| 1058 | Error **errp) |
Paolo Bonzini | af49bbb | 2011-09-19 14:03:37 +0200 | [diff] [blame] | 1059 | { |
| 1060 | NBDExport *exp = g_malloc0(sizeof(NBDExport)); |
Paolo Bonzini | 2c8d9f0 | 2012-09-18 13:26:25 +0200 | [diff] [blame] | 1061 | exp->refcount = 1; |
Paolo Bonzini | 4b9441f | 2012-09-18 13:58:25 +0200 | [diff] [blame] | 1062 | QTAILQ_INIT(&exp->clients); |
Max Reitz | aadf99a | 2014-11-18 12:21:18 +0100 | [diff] [blame] | 1063 | exp->blk = blk; |
Paolo Bonzini | af49bbb | 2011-09-19 14:03:37 +0200 | [diff] [blame] | 1064 | exp->dev_offset = dev_offset; |
| 1065 | exp->nbdflags = nbdflags; |
Max Reitz | 98f44bb | 2015-02-25 13:08:21 -0500 | [diff] [blame] | 1066 | exp->size = size < 0 ? blk_getlength(blk) : size; |
| 1067 | if (exp->size < 0) { |
| 1068 | error_setg_errno(errp, -exp->size, |
| 1069 | "Failed to determine the NBD export's length"); |
| 1070 | goto fail; |
| 1071 | } |
| 1072 | exp->size -= exp->size % BDRV_SECTOR_SIZE; |
| 1073 | |
Paolo Bonzini | 0ddf08d | 2012-09-18 13:59:03 +0200 | [diff] [blame] | 1074 | exp->close = close; |
Max Reitz | aadf99a | 2014-11-18 12:21:18 +0100 | [diff] [blame] | 1075 | exp->ctx = blk_get_aio_context(blk); |
| 1076 | blk_ref(blk); |
| 1077 | blk_add_aio_context_notifier(blk, blk_aio_attached, blk_aio_detach, exp); |
Alexey Kardashevskiy | 7ea2d26 | 2014-10-09 13:50:46 +1100 | [diff] [blame] | 1078 | /* |
| 1079 | * NBD exports are used for non-shared storage migration. Make sure |
| 1080 | * that BDRV_O_INCOMING is cleared and the image is ready for write |
| 1081 | * access since the export could be available before migration handover. |
| 1082 | */ |
Max Reitz | aadf99a | 2014-11-18 12:21:18 +0100 | [diff] [blame] | 1083 | blk_invalidate_cache(blk, NULL); |
Paolo Bonzini | af49bbb | 2011-09-19 14:03:37 +0200 | [diff] [blame] | 1084 | return exp; |
Max Reitz | 98f44bb | 2015-02-25 13:08:21 -0500 | [diff] [blame] | 1085 | |
| 1086 | fail: |
| 1087 | g_free(exp); |
| 1088 | return NULL; |
Paolo Bonzini | af49bbb | 2011-09-19 14:03:37 +0200 | [diff] [blame] | 1089 | } |
| 1090 | |
Paolo Bonzini | ee0a19e | 2012-08-22 15:59:23 +0200 | [diff] [blame] | 1091 | NBDExport *nbd_export_find(const char *name) |
| 1092 | { |
| 1093 | NBDExport *exp; |
| 1094 | QTAILQ_FOREACH(exp, &exports, next) { |
| 1095 | if (strcmp(name, exp->name) == 0) { |
| 1096 | return exp; |
| 1097 | } |
| 1098 | } |
| 1099 | |
| 1100 | return NULL; |
| 1101 | } |
| 1102 | |
| 1103 | void nbd_export_set_name(NBDExport *exp, const char *name) |
| 1104 | { |
| 1105 | if (exp->name == name) { |
| 1106 | return; |
| 1107 | } |
| 1108 | |
| 1109 | nbd_export_get(exp); |
| 1110 | if (exp->name != NULL) { |
| 1111 | g_free(exp->name); |
| 1112 | exp->name = NULL; |
| 1113 | QTAILQ_REMOVE(&exports, exp, next); |
| 1114 | nbd_export_put(exp); |
| 1115 | } |
| 1116 | if (name != NULL) { |
| 1117 | nbd_export_get(exp); |
| 1118 | exp->name = g_strdup(name); |
| 1119 | QTAILQ_INSERT_TAIL(&exports, exp, next); |
| 1120 | } |
| 1121 | nbd_export_put(exp); |
| 1122 | } |
| 1123 | |
Paolo Bonzini | af49bbb | 2011-09-19 14:03:37 +0200 | [diff] [blame] | 1124 | void nbd_export_close(NBDExport *exp) |
| 1125 | { |
Paolo Bonzini | 4b9441f | 2012-09-18 13:58:25 +0200 | [diff] [blame] | 1126 | NBDClient *client, *next; |
Paolo Bonzini | 2c8d9f0 | 2012-09-18 13:26:25 +0200 | [diff] [blame] | 1127 | |
Paolo Bonzini | 4b9441f | 2012-09-18 13:58:25 +0200 | [diff] [blame] | 1128 | nbd_export_get(exp); |
| 1129 | QTAILQ_FOREACH_SAFE(client, &exp->clients, next, next) { |
Max Reitz | f53a829 | 2015-02-06 16:06:16 -0500 | [diff] [blame] | 1130 | client_close(client); |
Paolo Bonzini | 4b9441f | 2012-09-18 13:58:25 +0200 | [diff] [blame] | 1131 | } |
Paolo Bonzini | 125afda | 2012-09-18 14:31:44 +0200 | [diff] [blame] | 1132 | nbd_export_set_name(exp, NULL); |
Paolo Bonzini | 4b9441f | 2012-09-18 13:58:25 +0200 | [diff] [blame] | 1133 | nbd_export_put(exp); |
Paolo Bonzini | 2c8d9f0 | 2012-09-18 13:26:25 +0200 | [diff] [blame] | 1134 | } |
| 1135 | |
| 1136 | void nbd_export_get(NBDExport *exp) |
| 1137 | { |
| 1138 | assert(exp->refcount > 0); |
| 1139 | exp->refcount++; |
| 1140 | } |
| 1141 | |
| 1142 | void nbd_export_put(NBDExport *exp) |
| 1143 | { |
| 1144 | assert(exp->refcount > 0); |
| 1145 | if (exp->refcount == 1) { |
| 1146 | nbd_export_close(exp); |
Paolo Bonzini | d9a7380 | 2011-09-19 14:18:33 +0200 | [diff] [blame] | 1147 | } |
| 1148 | |
Paolo Bonzini | 2c8d9f0 | 2012-09-18 13:26:25 +0200 | [diff] [blame] | 1149 | if (--exp->refcount == 0) { |
Paolo Bonzini | ee0a19e | 2012-08-22 15:59:23 +0200 | [diff] [blame] | 1150 | assert(exp->name == NULL); |
| 1151 | |
Paolo Bonzini | 0ddf08d | 2012-09-18 13:59:03 +0200 | [diff] [blame] | 1152 | if (exp->close) { |
| 1153 | exp->close(exp); |
| 1154 | } |
| 1155 | |
Wen Congyang | d626834 | 2015-09-16 16:35:46 +0800 | [diff] [blame] | 1156 | if (exp->blk) { |
| 1157 | blk_remove_aio_context_notifier(exp->blk, blk_aio_attached, |
| 1158 | blk_aio_detach, exp); |
| 1159 | blk_unref(exp->blk); |
| 1160 | exp->blk = NULL; |
| 1161 | } |
| 1162 | |
Paolo Bonzini | 2c8d9f0 | 2012-09-18 13:26:25 +0200 | [diff] [blame] | 1163 | g_free(exp); |
| 1164 | } |
Paolo Bonzini | af49bbb | 2011-09-19 14:03:37 +0200 | [diff] [blame] | 1165 | } |
| 1166 | |
Max Reitz | e140177 | 2014-11-18 12:21:17 +0100 | [diff] [blame] | 1167 | BlockBackend *nbd_export_get_blockdev(NBDExport *exp) |
Paolo Bonzini | 125afda | 2012-09-18 14:31:44 +0200 | [diff] [blame] | 1168 | { |
Max Reitz | aadf99a | 2014-11-18 12:21:18 +0100 | [diff] [blame] | 1169 | return exp->blk; |
Paolo Bonzini | 125afda | 2012-09-18 14:31:44 +0200 | [diff] [blame] | 1170 | } |
| 1171 | |
Paolo Bonzini | ee0a19e | 2012-08-22 15:59:23 +0200 | [diff] [blame] | 1172 | void nbd_export_close_all(void) |
| 1173 | { |
| 1174 | NBDExport *exp, *next; |
| 1175 | |
| 1176 | QTAILQ_FOREACH_SAFE(exp, &exports, next, next) { |
| 1177 | nbd_export_close(exp); |
Paolo Bonzini | ee0a19e | 2012-08-22 15:59:23 +0200 | [diff] [blame] | 1178 | } |
| 1179 | } |
| 1180 | |
Paolo Bonzini | 94e7340 | 2012-03-07 11:25:01 +0100 | [diff] [blame] | 1181 | static ssize_t nbd_co_send_reply(NBDRequest *req, struct nbd_reply *reply, |
| 1182 | int len) |
Paolo Bonzini | 2204559 | 2011-09-19 14:25:30 +0200 | [diff] [blame] | 1183 | { |
Paolo Bonzini | 72deddc | 2011-10-07 16:47:56 +0200 | [diff] [blame] | 1184 | NBDClient *client = req->client; |
| 1185 | int csock = client->sock; |
Paolo Bonzini | 94e7340 | 2012-03-07 11:25:01 +0100 | [diff] [blame] | 1186 | ssize_t rc, ret; |
Paolo Bonzini | 2204559 | 2011-09-19 14:25:30 +0200 | [diff] [blame] | 1187 | |
Paolo Bonzini | 262db38 | 2011-09-19 15:19:27 +0200 | [diff] [blame] | 1188 | qemu_co_mutex_lock(&client->send_lock); |
Paolo Bonzini | 262db38 | 2011-09-19 15:19:27 +0200 | [diff] [blame] | 1189 | client->send_coroutine = qemu_coroutine_self(); |
Max Reitz | 958c717 | 2014-06-20 21:57:32 +0200 | [diff] [blame] | 1190 | nbd_set_handlers(client); |
Paolo Bonzini | 262db38 | 2011-09-19 15:19:27 +0200 | [diff] [blame] | 1191 | |
Paolo Bonzini | 2204559 | 2011-09-19 14:25:30 +0200 | [diff] [blame] | 1192 | if (!len) { |
| 1193 | rc = nbd_send_reply(csock, reply); |
Paolo Bonzini | 2204559 | 2011-09-19 14:25:30 +0200 | [diff] [blame] | 1194 | } else { |
| 1195 | socket_set_cork(csock, 1); |
| 1196 | rc = nbd_send_reply(csock, reply); |
Paolo Bonzini | fc19f8a | 2012-03-07 11:05:34 +0100 | [diff] [blame] | 1197 | if (rc >= 0) { |
Paolo Bonzini | 262db38 | 2011-09-19 15:19:27 +0200 | [diff] [blame] | 1198 | ret = qemu_co_send(csock, req->data, len); |
Paolo Bonzini | 2204559 | 2011-09-19 14:25:30 +0200 | [diff] [blame] | 1199 | if (ret != len) { |
Paolo Bonzini | 185b433 | 2012-03-05 08:56:10 +0100 | [diff] [blame] | 1200 | rc = -EIO; |
Paolo Bonzini | 2204559 | 2011-09-19 14:25:30 +0200 | [diff] [blame] | 1201 | } |
| 1202 | } |
Paolo Bonzini | 2204559 | 2011-09-19 14:25:30 +0200 | [diff] [blame] | 1203 | socket_set_cork(csock, 0); |
| 1204 | } |
Paolo Bonzini | 262db38 | 2011-09-19 15:19:27 +0200 | [diff] [blame] | 1205 | |
| 1206 | client->send_coroutine = NULL; |
Max Reitz | 958c717 | 2014-06-20 21:57:32 +0200 | [diff] [blame] | 1207 | nbd_set_handlers(client); |
Paolo Bonzini | 262db38 | 2011-09-19 15:19:27 +0200 | [diff] [blame] | 1208 | qemu_co_mutex_unlock(&client->send_lock); |
Paolo Bonzini | 2204559 | 2011-09-19 14:25:30 +0200 | [diff] [blame] | 1209 | return rc; |
| 1210 | } |
| 1211 | |
Paolo Bonzini | 94e7340 | 2012-03-07 11:25:01 +0100 | [diff] [blame] | 1212 | static ssize_t nbd_co_receive_request(NBDRequest *req, struct nbd_request *request) |
Paolo Bonzini | a030b34 | 2011-09-19 15:07:54 +0200 | [diff] [blame] | 1213 | { |
Paolo Bonzini | 72deddc | 2011-10-07 16:47:56 +0200 | [diff] [blame] | 1214 | NBDClient *client = req->client; |
| 1215 | int csock = client->sock; |
Stefan Hajnoczi | 2d82148 | 2013-05-02 14:23:08 +0200 | [diff] [blame] | 1216 | uint32_t command; |
Paolo Bonzini | 94e7340 | 2012-03-07 11:25:01 +0100 | [diff] [blame] | 1217 | ssize_t rc; |
Paolo Bonzini | a030b34 | 2011-09-19 15:07:54 +0200 | [diff] [blame] | 1218 | |
Paolo Bonzini | 262db38 | 2011-09-19 15:19:27 +0200 | [diff] [blame] | 1219 | client->recv_coroutine = qemu_coroutine_self(); |
Max Reitz | 958c717 | 2014-06-20 21:57:32 +0200 | [diff] [blame] | 1220 | nbd_update_can_read(client); |
| 1221 | |
Paolo Bonzini | 7fe7b68 | 2012-03-05 09:10:35 +0100 | [diff] [blame] | 1222 | rc = nbd_receive_request(csock, request); |
| 1223 | if (rc < 0) { |
| 1224 | if (rc != -EAGAIN) { |
| 1225 | rc = -EIO; |
| 1226 | } |
Paolo Bonzini | a030b34 | 2011-09-19 15:07:54 +0200 | [diff] [blame] | 1227 | goto out; |
| 1228 | } |
| 1229 | |
Stefan Hajnoczi | 2d82148 | 2013-05-02 14:23:08 +0200 | [diff] [blame] | 1230 | if (request->len > NBD_MAX_BUFFER_SIZE) { |
Paolo Bonzini | a030b34 | 2011-09-19 15:07:54 +0200 | [diff] [blame] | 1231 | LOG("len (%u) is larger than max len (%u)", |
Stefan Hajnoczi | 2d82148 | 2013-05-02 14:23:08 +0200 | [diff] [blame] | 1232 | request->len, NBD_MAX_BUFFER_SIZE); |
Paolo Bonzini | a030b34 | 2011-09-19 15:07:54 +0200 | [diff] [blame] | 1233 | rc = -EINVAL; |
| 1234 | goto out; |
| 1235 | } |
| 1236 | |
| 1237 | if ((request->from + request->len) < request->from) { |
| 1238 | LOG("integer overflow detected! " |
| 1239 | "you're probably being attacked"); |
| 1240 | rc = -EINVAL; |
| 1241 | goto out; |
| 1242 | } |
| 1243 | |
| 1244 | TRACE("Decoding type"); |
| 1245 | |
Stefan Hajnoczi | 2d82148 | 2013-05-02 14:23:08 +0200 | [diff] [blame] | 1246 | command = request->type & NBD_CMD_MASK_COMMAND; |
| 1247 | if (command == NBD_CMD_READ || command == NBD_CMD_WRITE) { |
Max Reitz | aadf99a | 2014-11-18 12:21:18 +0100 | [diff] [blame] | 1248 | req->data = blk_blockalign(client->exp->blk, request->len); |
Stefan Hajnoczi | 2d82148 | 2013-05-02 14:23:08 +0200 | [diff] [blame] | 1249 | } |
| 1250 | if (command == NBD_CMD_WRITE) { |
Paolo Bonzini | a030b34 | 2011-09-19 15:07:54 +0200 | [diff] [blame] | 1251 | TRACE("Reading %u byte(s)", request->len); |
| 1252 | |
Paolo Bonzini | 262db38 | 2011-09-19 15:19:27 +0200 | [diff] [blame] | 1253 | if (qemu_co_recv(csock, req->data, request->len) != request->len) { |
Paolo Bonzini | a030b34 | 2011-09-19 15:07:54 +0200 | [diff] [blame] | 1254 | LOG("reading from socket failed"); |
| 1255 | rc = -EIO; |
| 1256 | goto out; |
| 1257 | } |
| 1258 | } |
| 1259 | rc = 0; |
| 1260 | |
| 1261 | out: |
Paolo Bonzini | 262db38 | 2011-09-19 15:19:27 +0200 | [diff] [blame] | 1262 | client->recv_coroutine = NULL; |
Max Reitz | 958c717 | 2014-06-20 21:57:32 +0200 | [diff] [blame] | 1263 | nbd_update_can_read(client); |
| 1264 | |
Paolo Bonzini | a030b34 | 2011-09-19 15:07:54 +0200 | [diff] [blame] | 1265 | return rc; |
| 1266 | } |
| 1267 | |
Paolo Bonzini | 262db38 | 2011-09-19 15:19:27 +0200 | [diff] [blame] | 1268 | static void nbd_trip(void *opaque) |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 1269 | { |
Paolo Bonzini | 262db38 | 2011-09-19 15:19:27 +0200 | [diff] [blame] | 1270 | NBDClient *client = opaque; |
Paolo Bonzini | 1743b51 | 2011-09-19 14:33:23 +0200 | [diff] [blame] | 1271 | NBDExport *exp = client->exp; |
Paolo Bonzini | ff2b68a | 2012-08-22 18:45:12 +0200 | [diff] [blame] | 1272 | NBDRequest *req; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 1273 | struct nbd_request request; |
| 1274 | struct nbd_reply reply; |
Paolo Bonzini | 94e7340 | 2012-03-07 11:25:01 +0100 | [diff] [blame] | 1275 | ssize_t ret; |
Hani Benhabiles | 8c5d1ab | 2014-05-18 11:50:05 +0100 | [diff] [blame] | 1276 | uint32_t command; |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 1277 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 1278 | TRACE("Reading request."); |
Paolo Bonzini | ff2b68a | 2012-08-22 18:45:12 +0200 | [diff] [blame] | 1279 | if (client->closing) { |
| 1280 | return; |
| 1281 | } |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 1282 | |
Paolo Bonzini | ff2b68a | 2012-08-22 18:45:12 +0200 | [diff] [blame] | 1283 | req = nbd_request_get(client); |
Paolo Bonzini | 262db38 | 2011-09-19 15:19:27 +0200 | [diff] [blame] | 1284 | ret = nbd_co_receive_request(req, &request); |
Paolo Bonzini | 7fe7b68 | 2012-03-05 09:10:35 +0100 | [diff] [blame] | 1285 | if (ret == -EAGAIN) { |
| 1286 | goto done; |
| 1287 | } |
Paolo Bonzini | a030b34 | 2011-09-19 15:07:54 +0200 | [diff] [blame] | 1288 | if (ret == -EIO) { |
Paolo Bonzini | d9a7380 | 2011-09-19 14:18:33 +0200 | [diff] [blame] | 1289 | goto out; |
Paolo Bonzini | a030b34 | 2011-09-19 15:07:54 +0200 | [diff] [blame] | 1290 | } |
ths | 7581825 | 2008-07-03 13:41:03 +0000 | [diff] [blame] | 1291 | |
Paolo Bonzini | fae6941 | 2011-09-19 16:04:36 +0200 | [diff] [blame] | 1292 | reply.handle = request.handle; |
| 1293 | reply.error = 0; |
| 1294 | |
Paolo Bonzini | a030b34 | 2011-09-19 15:07:54 +0200 | [diff] [blame] | 1295 | if (ret < 0) { |
| 1296 | reply.error = -ret; |
| 1297 | goto error_reply; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 1298 | } |
Hani Benhabiles | 8c5d1ab | 2014-05-18 11:50:05 +0100 | [diff] [blame] | 1299 | command = request.type & NBD_CMD_MASK_COMMAND; |
| 1300 | if (command != NBD_CMD_DISC && (request.from + request.len) > exp->size) { |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 1301 | LOG("From: %" PRIu64 ", Len: %u, Size: %" PRIu64 |
| 1302 | ", Offset: %" PRIu64 "\n", |
Paolo Bonzini | af49bbb | 2011-09-19 14:03:37 +0200 | [diff] [blame] | 1303 | request.from, request.len, |
Stefan Weil | 0fee8f3 | 2012-04-12 22:30:16 +0200 | [diff] [blame] | 1304 | (uint64_t)exp->size, (uint64_t)exp->dev_offset); |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 1305 | LOG("requested operation past EOF--bad client?"); |
Paolo Bonzini | fae6941 | 2011-09-19 16:04:36 +0200 | [diff] [blame] | 1306 | goto invalid_request; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 1307 | } |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 1308 | |
Wen Congyang | d626834 | 2015-09-16 16:35:46 +0800 | [diff] [blame] | 1309 | if (client->closing) { |
| 1310 | /* |
| 1311 | * The client may be closed when we are blocked in |
| 1312 | * nbd_co_receive_request() |
| 1313 | */ |
| 1314 | goto done; |
| 1315 | } |
| 1316 | |
Hani Benhabiles | 8c5d1ab | 2014-05-18 11:50:05 +0100 | [diff] [blame] | 1317 | switch (command) { |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 1318 | case NBD_CMD_READ: |
| 1319 | TRACE("Request type is READ"); |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 1320 | |
Paolo Bonzini | e25ceb7 | 2012-04-19 11:59:11 +0200 | [diff] [blame] | 1321 | if (request.type & NBD_CMD_FLAG_FUA) { |
Max Reitz | aadf99a | 2014-11-18 12:21:18 +0100 | [diff] [blame] | 1322 | ret = blk_co_flush(exp->blk); |
Paolo Bonzini | e25ceb7 | 2012-04-19 11:59:11 +0200 | [diff] [blame] | 1323 | if (ret < 0) { |
| 1324 | LOG("flush failed"); |
| 1325 | reply.error = -ret; |
| 1326 | goto error_reply; |
| 1327 | } |
| 1328 | } |
| 1329 | |
Max Reitz | aadf99a | 2014-11-18 12:21:18 +0100 | [diff] [blame] | 1330 | ret = blk_read(exp->blk, |
| 1331 | (request.from + exp->dev_offset) / BDRV_SECTOR_SIZE, |
| 1332 | req->data, request.len / BDRV_SECTOR_SIZE); |
Paolo Bonzini | adcf630 | 2011-09-13 17:27:45 +0200 | [diff] [blame] | 1333 | if (ret < 0) { |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 1334 | LOG("reading from file failed"); |
Paolo Bonzini | adcf630 | 2011-09-13 17:27:45 +0200 | [diff] [blame] | 1335 | reply.error = -ret; |
Paolo Bonzini | fae6941 | 2011-09-19 16:04:36 +0200 | [diff] [blame] | 1336 | goto error_reply; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 1337 | } |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 1338 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 1339 | TRACE("Read %u byte(s)", request.len); |
Paolo Bonzini | 262db38 | 2011-09-19 15:19:27 +0200 | [diff] [blame] | 1340 | if (nbd_co_send_reply(req, &reply, request.len) < 0) |
Paolo Bonzini | d9a7380 | 2011-09-19 14:18:33 +0200 | [diff] [blame] | 1341 | goto out; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 1342 | break; |
| 1343 | case NBD_CMD_WRITE: |
| 1344 | TRACE("Request type is WRITE"); |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 1345 | |
Paolo Bonzini | af49bbb | 2011-09-19 14:03:37 +0200 | [diff] [blame] | 1346 | if (exp->nbdflags & NBD_FLAG_READ_ONLY) { |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 1347 | TRACE("Server is read-only, return error"); |
Paolo Bonzini | fae6941 | 2011-09-19 16:04:36 +0200 | [diff] [blame] | 1348 | reply.error = EROFS; |
| 1349 | goto error_reply; |
| 1350 | } |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 1351 | |
Paolo Bonzini | fae6941 | 2011-09-19 16:04:36 +0200 | [diff] [blame] | 1352 | TRACE("Writing to device"); |
| 1353 | |
Max Reitz | aadf99a | 2014-11-18 12:21:18 +0100 | [diff] [blame] | 1354 | ret = blk_write(exp->blk, |
| 1355 | (request.from + exp->dev_offset) / BDRV_SECTOR_SIZE, |
| 1356 | req->data, request.len / BDRV_SECTOR_SIZE); |
Paolo Bonzini | fae6941 | 2011-09-19 16:04:36 +0200 | [diff] [blame] | 1357 | if (ret < 0) { |
| 1358 | LOG("writing to file failed"); |
| 1359 | reply.error = -ret; |
| 1360 | goto error_reply; |
| 1361 | } |
| 1362 | |
| 1363 | if (request.type & NBD_CMD_FLAG_FUA) { |
Max Reitz | aadf99a | 2014-11-18 12:21:18 +0100 | [diff] [blame] | 1364 | ret = blk_co_flush(exp->blk); |
Paolo Bonzini | adcf630 | 2011-09-13 17:27:45 +0200 | [diff] [blame] | 1365 | if (ret < 0) { |
Paolo Bonzini | fae6941 | 2011-09-19 16:04:36 +0200 | [diff] [blame] | 1366 | LOG("flush failed"); |
Paolo Bonzini | adcf630 | 2011-09-13 17:27:45 +0200 | [diff] [blame] | 1367 | reply.error = -ret; |
Paolo Bonzini | fae6941 | 2011-09-19 16:04:36 +0200 | [diff] [blame] | 1368 | goto error_reply; |
Paolo Bonzini | 2c7989a | 2011-10-21 13:16:28 +0200 | [diff] [blame] | 1369 | } |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 1370 | } |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 1371 | |
Paolo Bonzini | fc19f8a | 2012-03-07 11:05:34 +0100 | [diff] [blame] | 1372 | if (nbd_co_send_reply(req, &reply, 0) < 0) { |
Paolo Bonzini | d9a7380 | 2011-09-19 14:18:33 +0200 | [diff] [blame] | 1373 | goto out; |
Paolo Bonzini | fc19f8a | 2012-03-07 11:05:34 +0100 | [diff] [blame] | 1374 | } |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 1375 | break; |
| 1376 | case NBD_CMD_DISC: |
| 1377 | TRACE("Request type is DISCONNECT"); |
| 1378 | errno = 0; |
Paolo Bonzini | 262db38 | 2011-09-19 15:19:27 +0200 | [diff] [blame] | 1379 | goto out; |
Paolo Bonzini | 1486d04 | 2011-10-21 13:17:14 +0200 | [diff] [blame] | 1380 | case NBD_CMD_FLUSH: |
| 1381 | TRACE("Request type is FLUSH"); |
| 1382 | |
Max Reitz | aadf99a | 2014-11-18 12:21:18 +0100 | [diff] [blame] | 1383 | ret = blk_co_flush(exp->blk); |
Paolo Bonzini | 1486d04 | 2011-10-21 13:17:14 +0200 | [diff] [blame] | 1384 | if (ret < 0) { |
| 1385 | LOG("flush failed"); |
| 1386 | reply.error = -ret; |
| 1387 | } |
Paolo Bonzini | fc19f8a | 2012-03-07 11:05:34 +0100 | [diff] [blame] | 1388 | if (nbd_co_send_reply(req, &reply, 0) < 0) { |
Paolo Bonzini | d9a7380 | 2011-09-19 14:18:33 +0200 | [diff] [blame] | 1389 | goto out; |
Paolo Bonzini | fc19f8a | 2012-03-07 11:05:34 +0100 | [diff] [blame] | 1390 | } |
Paolo Bonzini | 1486d04 | 2011-10-21 13:17:14 +0200 | [diff] [blame] | 1391 | break; |
Paolo Bonzini | 7a70663 | 2011-10-21 13:17:14 +0200 | [diff] [blame] | 1392 | case NBD_CMD_TRIM: |
| 1393 | TRACE("Request type is TRIM"); |
Max Reitz | aadf99a | 2014-11-18 12:21:18 +0100 | [diff] [blame] | 1394 | ret = blk_co_discard(exp->blk, (request.from + exp->dev_offset) |
| 1395 | / BDRV_SECTOR_SIZE, |
| 1396 | request.len / BDRV_SECTOR_SIZE); |
Paolo Bonzini | 7a70663 | 2011-10-21 13:17:14 +0200 | [diff] [blame] | 1397 | if (ret < 0) { |
| 1398 | LOG("discard failed"); |
| 1399 | reply.error = -ret; |
| 1400 | } |
Paolo Bonzini | fc19f8a | 2012-03-07 11:05:34 +0100 | [diff] [blame] | 1401 | if (nbd_co_send_reply(req, &reply, 0) < 0) { |
Paolo Bonzini | d9a7380 | 2011-09-19 14:18:33 +0200 | [diff] [blame] | 1402 | goto out; |
Paolo Bonzini | fc19f8a | 2012-03-07 11:05:34 +0100 | [diff] [blame] | 1403 | } |
Paolo Bonzini | 7a70663 | 2011-10-21 13:17:14 +0200 | [diff] [blame] | 1404 | break; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 1405 | default: |
| 1406 | LOG("invalid request type (%u) received", request.type); |
Paolo Bonzini | fae6941 | 2011-09-19 16:04:36 +0200 | [diff] [blame] | 1407 | invalid_request: |
Yik Fang | 8b2f0ab | 2015-02-12 06:21:51 +0000 | [diff] [blame] | 1408 | reply.error = EINVAL; |
Paolo Bonzini | fae6941 | 2011-09-19 16:04:36 +0200 | [diff] [blame] | 1409 | error_reply: |
Paolo Bonzini | fc19f8a | 2012-03-07 11:05:34 +0100 | [diff] [blame] | 1410 | if (nbd_co_send_reply(req, &reply, 0) < 0) { |
Paolo Bonzini | d9a7380 | 2011-09-19 14:18:33 +0200 | [diff] [blame] | 1411 | goto out; |
Paolo Bonzini | fc19f8a | 2012-03-07 11:05:34 +0100 | [diff] [blame] | 1412 | } |
Paolo Bonzini | fae6941 | 2011-09-19 16:04:36 +0200 | [diff] [blame] | 1413 | break; |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 1414 | } |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 1415 | |
Nick Thomas | b2e3d87 | 2011-02-22 15:44:51 +0000 | [diff] [blame] | 1416 | TRACE("Request/Reply complete"); |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 1417 | |
Paolo Bonzini | 7fe7b68 | 2012-03-05 09:10:35 +0100 | [diff] [blame] | 1418 | done: |
Paolo Bonzini | 262db38 | 2011-09-19 15:19:27 +0200 | [diff] [blame] | 1419 | nbd_request_put(req); |
| 1420 | return; |
| 1421 | |
Paolo Bonzini | d9a7380 | 2011-09-19 14:18:33 +0200 | [diff] [blame] | 1422 | out: |
Paolo Bonzini | 72deddc | 2011-10-07 16:47:56 +0200 | [diff] [blame] | 1423 | nbd_request_put(req); |
Max Reitz | f53a829 | 2015-02-06 16:06:16 -0500 | [diff] [blame] | 1424 | client_close(client); |
bellard | 7a5ca86 | 2008-05-27 21:13:40 +0000 | [diff] [blame] | 1425 | } |
Paolo Bonzini | af49bbb | 2011-09-19 14:03:37 +0200 | [diff] [blame] | 1426 | |
Paolo Bonzini | 1743b51 | 2011-09-19 14:33:23 +0200 | [diff] [blame] | 1427 | static void nbd_read(void *opaque) |
Paolo Bonzini | af49bbb | 2011-09-19 14:03:37 +0200 | [diff] [blame] | 1428 | { |
Paolo Bonzini | 1743b51 | 2011-09-19 14:33:23 +0200 | [diff] [blame] | 1429 | NBDClient *client = opaque; |
| 1430 | |
Paolo Bonzini | 262db38 | 2011-09-19 15:19:27 +0200 | [diff] [blame] | 1431 | if (client->recv_coroutine) { |
| 1432 | qemu_coroutine_enter(client->recv_coroutine, NULL); |
| 1433 | } else { |
| 1434 | qemu_coroutine_enter(qemu_coroutine_create(nbd_trip), client); |
Paolo Bonzini | 1743b51 | 2011-09-19 14:33:23 +0200 | [diff] [blame] | 1435 | } |
Paolo Bonzini | 1743b51 | 2011-09-19 14:33:23 +0200 | [diff] [blame] | 1436 | } |
| 1437 | |
Paolo Bonzini | 262db38 | 2011-09-19 15:19:27 +0200 | [diff] [blame] | 1438 | static void nbd_restart_write(void *opaque) |
| 1439 | { |
| 1440 | NBDClient *client = opaque; |
| 1441 | |
| 1442 | qemu_coroutine_enter(client->send_coroutine, NULL); |
| 1443 | } |
| 1444 | |
Max Reitz | 958c717 | 2014-06-20 21:57:32 +0200 | [diff] [blame] | 1445 | static void nbd_set_handlers(NBDClient *client) |
| 1446 | { |
| 1447 | if (client->exp && client->exp->ctx) { |
| 1448 | aio_set_fd_handler(client->exp->ctx, client->sock, |
Fam Zheng | 172cc12 | 2015-10-23 11:08:06 +0800 | [diff] [blame] | 1449 | true, |
Max Reitz | 958c717 | 2014-06-20 21:57:32 +0200 | [diff] [blame] | 1450 | client->can_read ? nbd_read : NULL, |
| 1451 | client->send_coroutine ? nbd_restart_write : NULL, |
| 1452 | client); |
| 1453 | } |
| 1454 | } |
| 1455 | |
| 1456 | static void nbd_unset_handlers(NBDClient *client) |
| 1457 | { |
| 1458 | if (client->exp && client->exp->ctx) { |
Fam Zheng | dca21ef | 2015-10-23 11:08:05 +0800 | [diff] [blame] | 1459 | aio_set_fd_handler(client->exp->ctx, client->sock, |
Fam Zheng | 172cc12 | 2015-10-23 11:08:06 +0800 | [diff] [blame] | 1460 | true, NULL, NULL, NULL); |
Max Reitz | 958c717 | 2014-06-20 21:57:32 +0200 | [diff] [blame] | 1461 | } |
| 1462 | } |
| 1463 | |
| 1464 | static void nbd_update_can_read(NBDClient *client) |
| 1465 | { |
| 1466 | bool can_read = client->recv_coroutine || |
| 1467 | client->nb_requests < MAX_NBD_REQUESTS; |
| 1468 | |
| 1469 | if (can_read != client->can_read) { |
| 1470 | client->can_read = can_read; |
| 1471 | nbd_set_handlers(client); |
| 1472 | |
| 1473 | /* There is no need to invoke aio_notify(), since aio_set_fd_handler() |
| 1474 | * in nbd_set_handlers() will have taken care of that */ |
| 1475 | } |
| 1476 | } |
| 1477 | |
Paolo Bonzini | 1743b51 | 2011-09-19 14:33:23 +0200 | [diff] [blame] | 1478 | NBDClient *nbd_client_new(NBDExport *exp, int csock, |
| 1479 | void (*close)(NBDClient *)) |
| 1480 | { |
| 1481 | NBDClient *client; |
Paolo Bonzini | 1743b51 | 2011-09-19 14:33:23 +0200 | [diff] [blame] | 1482 | client = g_malloc0(sizeof(NBDClient)); |
| 1483 | client->refcount = 1; |
| 1484 | client->exp = exp; |
| 1485 | client->sock = csock; |
Max Reitz | 958c717 | 2014-06-20 21:57:32 +0200 | [diff] [blame] | 1486 | client->can_read = true; |
Hani Benhabiles | f5076b5 | 2014-06-07 01:32:31 +0100 | [diff] [blame] | 1487 | if (nbd_send_negotiate(client)) { |
Paolo Bonzini | 9a304d2 | 2012-08-22 15:30:31 +0200 | [diff] [blame] | 1488 | g_free(client); |
| 1489 | return NULL; |
| 1490 | } |
Paolo Bonzini | 1743b51 | 2011-09-19 14:33:23 +0200 | [diff] [blame] | 1491 | client->close = close; |
Paolo Bonzini | 262db38 | 2011-09-19 15:19:27 +0200 | [diff] [blame] | 1492 | qemu_co_mutex_init(&client->send_lock); |
Max Reitz | 958c717 | 2014-06-20 21:57:32 +0200 | [diff] [blame] | 1493 | nbd_set_handlers(client); |
Paolo Bonzini | 2c8d9f0 | 2012-09-18 13:26:25 +0200 | [diff] [blame] | 1494 | |
Paolo Bonzini | 6b8c01e | 2012-08-23 14:57:11 +0200 | [diff] [blame] | 1495 | if (exp) { |
| 1496 | QTAILQ_INSERT_TAIL(&exp->clients, client, next); |
| 1497 | nbd_export_get(exp); |
| 1498 | } |
Paolo Bonzini | 1743b51 | 2011-09-19 14:33:23 +0200 | [diff] [blame] | 1499 | return client; |
Paolo Bonzini | af49bbb | 2011-09-19 14:03:37 +0200 | [diff] [blame] | 1500 | } |