Eric Blake | 2e6fc7e | 2016-12-02 13:48:53 -0600 | [diff] [blame] | 1 | /* BlockDriver implementation for "raw" format driver |
Laszlo Ersek | e1c66c6 | 2013-08-21 12:41:17 +0200 | [diff] [blame] | 2 | * |
Eric Blake | ad82be2 | 2016-06-23 16:37:22 -0600 | [diff] [blame] | 3 | * Copyright (C) 2010-2016 Red Hat, Inc. |
Laszlo Ersek | ff369a4 | 2013-08-21 12:41:21 +0200 | [diff] [blame] | 4 | * Copyright (C) 2010, Blue Swirl <blauwirbel@gmail.com> |
Laszlo Ersek | 775d6af | 2013-08-21 12:41:22 +0200 | [diff] [blame] | 5 | * Copyright (C) 2009, Anthony Liguori <aliguori@us.ibm.com> |
Laszlo Ersek | e1c66c6 | 2013-08-21 12:41:17 +0200 | [diff] [blame] | 6 | * |
| 7 | * Author: |
| 8 | * Laszlo Ersek <lersek@redhat.com> |
| 9 | * |
| 10 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 11 | * of this software and associated documentation files (the "Software"), to |
| 12 | * deal in the Software without restriction, including without limitation the |
| 13 | * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or |
| 14 | * sell copies of the Software, and to permit persons to whom the Software is |
| 15 | * furnished to do so, subject to the following conditions: |
| 16 | * |
| 17 | * The above copyright notice and this permission notice shall be included in |
| 18 | * all copies or substantial portions of the Software. |
| 19 | * |
| 20 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 21 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 22 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 23 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 24 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| 25 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
| 26 | * IN THE SOFTWARE. |
| 27 | */ |
| 28 | |
Peter Maydell | 80c71a2 | 2016-01-18 18:01:42 +0000 | [diff] [blame] | 29 | #include "qemu/osdep.h" |
Laszlo Ersek | e1c66c6 | 2013-08-21 12:41:17 +0200 | [diff] [blame] | 30 | #include "block/block_int.h" |
Markus Armbruster | da34e65 | 2016-03-14 09:01:28 +0100 | [diff] [blame] | 31 | #include "qapi/error.h" |
Laszlo Ersek | ff369a4 | 2013-08-21 12:41:21 +0200 | [diff] [blame] | 32 | #include "qemu/option.h" |
| 33 | |
Tomáš Golembiovský | 2fdc704 | 2016-10-31 11:27:40 +0100 | [diff] [blame] | 34 | typedef struct BDRVRawState { |
| 35 | uint64_t offset; |
| 36 | uint64_t size; |
| 37 | bool has_size; |
| 38 | } BDRVRawState; |
| 39 | |
| 40 | static QemuOptsList raw_runtime_opts = { |
| 41 | .name = "raw", |
| 42 | .head = QTAILQ_HEAD_INITIALIZER(raw_runtime_opts.head), |
| 43 | .desc = { |
| 44 | { |
| 45 | .name = "offset", |
| 46 | .type = QEMU_OPT_SIZE, |
| 47 | .help = "offset in the disk where the image starts", |
| 48 | }, |
| 49 | { |
| 50 | .name = "size", |
| 51 | .type = QEMU_OPT_SIZE, |
| 52 | .help = "virtual disk size", |
| 53 | }, |
| 54 | { /* end of list */ } |
| 55 | }, |
| 56 | }; |
| 57 | |
Chunyan Liu | cd3a4cf | 2014-06-05 17:21:03 +0800 | [diff] [blame] | 58 | static QemuOptsList raw_create_opts = { |
| 59 | .name = "raw-create-opts", |
| 60 | .head = QTAILQ_HEAD_INITIALIZER(raw_create_opts.head), |
| 61 | .desc = { |
| 62 | { |
| 63 | .name = BLOCK_OPT_SIZE, |
| 64 | .type = QEMU_OPT_SIZE, |
| 65 | .help = "Virtual disk size" |
| 66 | }, |
| 67 | { /* end of list */ } |
| 68 | } |
Laszlo Ersek | ff369a4 | 2013-08-21 12:41:21 +0200 | [diff] [blame] | 69 | }; |
Laszlo Ersek | e1c66c6 | 2013-08-21 12:41:17 +0200 | [diff] [blame] | 70 | |
Tomáš Golembiovský | 2fdc704 | 2016-10-31 11:27:40 +0100 | [diff] [blame] | 71 | static int raw_read_options(QDict *options, BlockDriverState *bs, |
| 72 | BDRVRawState *s, Error **errp) |
| 73 | { |
| 74 | Error *local_err = NULL; |
| 75 | QemuOpts *opts = NULL; |
| 76 | int64_t real_size = 0; |
| 77 | int ret; |
| 78 | |
| 79 | real_size = bdrv_getlength(bs->file->bs); |
| 80 | if (real_size < 0) { |
| 81 | error_setg_errno(errp, -real_size, "Could not get image size"); |
| 82 | return real_size; |
| 83 | } |
| 84 | |
| 85 | opts = qemu_opts_create(&raw_runtime_opts, NULL, 0, &error_abort); |
| 86 | qemu_opts_absorb_qdict(opts, options, &local_err); |
| 87 | if (local_err) { |
| 88 | error_propagate(errp, local_err); |
| 89 | ret = -EINVAL; |
| 90 | goto end; |
| 91 | } |
| 92 | |
| 93 | s->offset = qemu_opt_get_size(opts, "offset", 0); |
Tomáš Golembiovský | 4033287 | 2016-11-03 14:47:48 +0100 | [diff] [blame] | 94 | if (s->offset > real_size) { |
| 95 | error_setg(errp, "Offset (%" PRIu64 ") cannot be greater than " |
| 96 | "size of the containing file (%" PRId64 ")", |
| 97 | s->offset, real_size); |
| 98 | ret = -EINVAL; |
| 99 | goto end; |
| 100 | } |
| 101 | |
Tomáš Golembiovský | 2fdc704 | 2016-10-31 11:27:40 +0100 | [diff] [blame] | 102 | if (qemu_opt_find(opts, "size") != NULL) { |
| 103 | s->size = qemu_opt_get_size(opts, "size", 0); |
| 104 | s->has_size = true; |
| 105 | } else { |
| 106 | s->has_size = false; |
| 107 | s->size = real_size - s->offset; |
| 108 | } |
| 109 | |
| 110 | /* Check size and offset */ |
Tomáš Golembiovský | 4033287 | 2016-11-03 14:47:48 +0100 | [diff] [blame] | 111 | if ((real_size - s->offset) < s->size) { |
Tomáš Golembiovský | 2fdc704 | 2016-10-31 11:27:40 +0100 | [diff] [blame] | 112 | error_setg(errp, "The sum of offset (%" PRIu64 ") and size " |
| 113 | "(%" PRIu64 ") has to be smaller or equal to the " |
| 114 | " actual size of the containing file (%" PRId64 ")", |
| 115 | s->offset, s->size, real_size); |
| 116 | ret = -EINVAL; |
| 117 | goto end; |
| 118 | } |
| 119 | |
| 120 | /* Make sure size is multiple of BDRV_SECTOR_SIZE to prevent rounding |
| 121 | * up and leaking out of the specified area. */ |
Tomáš Golembiovský | 80a15e3 | 2016-11-03 14:47:49 +0100 | [diff] [blame] | 122 | if (s->has_size && !QEMU_IS_ALIGNED(s->size, BDRV_SECTOR_SIZE)) { |
Tomáš Golembiovský | 2fdc704 | 2016-10-31 11:27:40 +0100 | [diff] [blame] | 123 | error_setg(errp, "Specified size is not multiple of %llu", |
| 124 | BDRV_SECTOR_SIZE); |
| 125 | ret = -EINVAL; |
| 126 | goto end; |
| 127 | } |
| 128 | |
| 129 | ret = 0; |
| 130 | |
| 131 | end: |
| 132 | |
| 133 | qemu_opts_del(opts); |
| 134 | |
| 135 | return ret; |
| 136 | } |
| 137 | |
Laszlo Ersek | 7a6d3fc | 2013-08-21 12:41:23 +0200 | [diff] [blame] | 138 | static int raw_reopen_prepare(BDRVReopenState *reopen_state, |
| 139 | BlockReopenQueue *queue, Error **errp) |
Laszlo Ersek | e1c66c6 | 2013-08-21 12:41:17 +0200 | [diff] [blame] | 140 | { |
Tomáš Golembiovský | 2fdc704 | 2016-10-31 11:27:40 +0100 | [diff] [blame] | 141 | assert(reopen_state != NULL); |
| 142 | assert(reopen_state->bs != NULL); |
| 143 | |
| 144 | reopen_state->opaque = g_new0(BDRVRawState, 1); |
| 145 | |
| 146 | return raw_read_options( |
| 147 | reopen_state->options, |
| 148 | reopen_state->bs, |
| 149 | reopen_state->opaque, |
| 150 | errp); |
| 151 | } |
| 152 | |
| 153 | static void raw_reopen_commit(BDRVReopenState *state) |
| 154 | { |
| 155 | BDRVRawState *new_s = state->opaque; |
| 156 | BDRVRawState *s = state->bs->opaque; |
| 157 | |
| 158 | memcpy(s, new_s, sizeof(BDRVRawState)); |
| 159 | |
| 160 | g_free(state->opaque); |
| 161 | state->opaque = NULL; |
| 162 | } |
| 163 | |
| 164 | static void raw_reopen_abort(BDRVReopenState *state) |
| 165 | { |
| 166 | g_free(state->opaque); |
| 167 | state->opaque = NULL; |
Laszlo Ersek | e1c66c6 | 2013-08-21 12:41:17 +0200 | [diff] [blame] | 168 | } |
| 169 | |
Eric Blake | decaeed | 2016-07-15 17:23:08 -0600 | [diff] [blame] | 170 | static int coroutine_fn raw_co_preadv(BlockDriverState *bs, uint64_t offset, |
| 171 | uint64_t bytes, QEMUIOVector *qiov, |
| 172 | int flags) |
Laszlo Ersek | e1c66c6 | 2013-08-21 12:41:17 +0200 | [diff] [blame] | 173 | { |
Tomáš Golembiovský | 2fdc704 | 2016-10-31 11:27:40 +0100 | [diff] [blame] | 174 | BDRVRawState *s = bs->opaque; |
| 175 | |
| 176 | if (offset > UINT64_MAX - s->offset) { |
| 177 | return -EINVAL; |
| 178 | } |
| 179 | offset += s->offset; |
| 180 | |
Laszlo Ersek | 9eaafd9 | 2013-08-21 12:41:18 +0200 | [diff] [blame] | 181 | BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO); |
Eric Blake | decaeed | 2016-07-15 17:23:08 -0600 | [diff] [blame] | 182 | return bdrv_co_preadv(bs->file, offset, bytes, qiov, flags); |
Laszlo Ersek | e1c66c6 | 2013-08-21 12:41:17 +0200 | [diff] [blame] | 183 | } |
| 184 | |
Eric Blake | decaeed | 2016-07-15 17:23:08 -0600 | [diff] [blame] | 185 | static int coroutine_fn raw_co_pwritev(BlockDriverState *bs, uint64_t offset, |
| 186 | uint64_t bytes, QEMUIOVector *qiov, |
| 187 | int flags) |
Laszlo Ersek | e1c66c6 | 2013-08-21 12:41:17 +0200 | [diff] [blame] | 188 | { |
Tomáš Golembiovský | 2fdc704 | 2016-10-31 11:27:40 +0100 | [diff] [blame] | 189 | BDRVRawState *s = bs->opaque; |
Kevin Wolf | 38f3ef5 | 2014-11-20 16:27:12 +0100 | [diff] [blame] | 190 | void *buf = NULL; |
| 191 | BlockDriver *drv; |
| 192 | QEMUIOVector local_qiov; |
| 193 | int ret; |
| 194 | |
Tomáš Golembiovský | 2fdc704 | 2016-10-31 11:27:40 +0100 | [diff] [blame] | 195 | if (s->has_size && (offset > s->size || bytes > (s->size - offset))) { |
| 196 | /* There's not enough space for the data. Don't write anything and just |
| 197 | * fail to prevent leaking out of the size specified in options. */ |
| 198 | return -ENOSPC; |
| 199 | } |
| 200 | |
| 201 | if (offset > UINT64_MAX - s->offset) { |
| 202 | ret = -EINVAL; |
| 203 | goto fail; |
| 204 | } |
| 205 | |
Eric Blake | decaeed | 2016-07-15 17:23:08 -0600 | [diff] [blame] | 206 | if (bs->probed && offset < BLOCK_PROBE_BUF_SIZE && bytes) { |
| 207 | /* Handling partial writes would be a pain - so we just |
| 208 | * require that guests have 512-byte request alignment if |
| 209 | * probing occurred */ |
Kevin Wolf | 38f3ef5 | 2014-11-20 16:27:12 +0100 | [diff] [blame] | 210 | QEMU_BUILD_BUG_ON(BLOCK_PROBE_BUF_SIZE != 512); |
| 211 | QEMU_BUILD_BUG_ON(BDRV_SECTOR_SIZE != 512); |
Eric Blake | decaeed | 2016-07-15 17:23:08 -0600 | [diff] [blame] | 212 | assert(offset == 0 && bytes >= BLOCK_PROBE_BUF_SIZE); |
Kevin Wolf | 38f3ef5 | 2014-11-20 16:27:12 +0100 | [diff] [blame] | 213 | |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 214 | buf = qemu_try_blockalign(bs->file->bs, 512); |
Kevin Wolf | 38f3ef5 | 2014-11-20 16:27:12 +0100 | [diff] [blame] | 215 | if (!buf) { |
| 216 | ret = -ENOMEM; |
| 217 | goto fail; |
| 218 | } |
| 219 | |
| 220 | ret = qemu_iovec_to_buf(qiov, 0, buf, 512); |
| 221 | if (ret != 512) { |
| 222 | ret = -EINVAL; |
| 223 | goto fail; |
| 224 | } |
| 225 | |
| 226 | drv = bdrv_probe_all(buf, 512, NULL); |
| 227 | if (drv != bs->drv) { |
| 228 | ret = -EPERM; |
| 229 | goto fail; |
| 230 | } |
| 231 | |
| 232 | /* Use the checked buffer, a malicious guest might be overwriting its |
| 233 | * original buffer in the background. */ |
| 234 | qemu_iovec_init(&local_qiov, qiov->niov + 1); |
| 235 | qemu_iovec_add(&local_qiov, buf, 512); |
| 236 | qemu_iovec_concat(&local_qiov, qiov, 512, qiov->size - 512); |
| 237 | qiov = &local_qiov; |
| 238 | } |
| 239 | |
Tomáš Golembiovský | 2fdc704 | 2016-10-31 11:27:40 +0100 | [diff] [blame] | 240 | offset += s->offset; |
| 241 | |
Laszlo Ersek | 9eaafd9 | 2013-08-21 12:41:18 +0200 | [diff] [blame] | 242 | BLKDBG_EVENT(bs->file, BLKDBG_WRITE_AIO); |
Eric Blake | decaeed | 2016-07-15 17:23:08 -0600 | [diff] [blame] | 243 | ret = bdrv_co_pwritev(bs->file, offset, bytes, qiov, flags); |
Kevin Wolf | 38f3ef5 | 2014-11-20 16:27:12 +0100 | [diff] [blame] | 244 | |
| 245 | fail: |
| 246 | if (qiov == &local_qiov) { |
| 247 | qemu_iovec_destroy(&local_qiov); |
| 248 | } |
| 249 | qemu_vfree(buf); |
| 250 | return ret; |
Laszlo Ersek | e1c66c6 | 2013-08-21 12:41:17 +0200 | [diff] [blame] | 251 | } |
| 252 | |
Paolo Bonzini | b6b8a33 | 2013-09-04 19:00:28 +0200 | [diff] [blame] | 253 | static int64_t coroutine_fn raw_co_get_block_status(BlockDriverState *bs, |
| 254 | int64_t sector_num, |
Fam Zheng | 67a0fd2 | 2016-01-26 11:58:48 +0800 | [diff] [blame] | 255 | int nb_sectors, int *pnum, |
| 256 | BlockDriverState **file) |
Laszlo Ersek | e1c66c6 | 2013-08-21 12:41:17 +0200 | [diff] [blame] | 257 | { |
Tomáš Golembiovský | 2fdc704 | 2016-10-31 11:27:40 +0100 | [diff] [blame] | 258 | BDRVRawState *s = bs->opaque; |
Peter Lieven | 92bc50a | 2013-10-08 14:43:14 +0200 | [diff] [blame] | 259 | *pnum = nb_sectors; |
Fam Zheng | 02650ac | 2016-01-26 11:58:51 +0800 | [diff] [blame] | 260 | *file = bs->file->bs; |
Tomáš Golembiovský | 2fdc704 | 2016-10-31 11:27:40 +0100 | [diff] [blame] | 261 | sector_num += s->offset / BDRV_SECTOR_SIZE; |
Peter Lieven | 92bc50a | 2013-10-08 14:43:14 +0200 | [diff] [blame] | 262 | return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID | BDRV_BLOCK_DATA | |
| 263 | (sector_num << BDRV_SECTOR_BITS); |
Laszlo Ersek | e1c66c6 | 2013-08-21 12:41:17 +0200 | [diff] [blame] | 264 | } |
| 265 | |
Eric Blake | 39ad937 | 2016-06-01 15:10:11 -0600 | [diff] [blame] | 266 | static int coroutine_fn raw_co_pwrite_zeroes(BlockDriverState *bs, |
| 267 | int64_t offset, int count, |
| 268 | BdrvRequestFlags flags) |
Laszlo Ersek | e1c66c6 | 2013-08-21 12:41:17 +0200 | [diff] [blame] | 269 | { |
Tomáš Golembiovský | 2fdc704 | 2016-10-31 11:27:40 +0100 | [diff] [blame] | 270 | BDRVRawState *s = bs->opaque; |
| 271 | if (offset > UINT64_MAX - s->offset) { |
| 272 | return -EINVAL; |
| 273 | } |
| 274 | offset += s->offset; |
Kevin Wolf | a03ef88 | 2016-06-20 21:31:46 +0200 | [diff] [blame] | 275 | return bdrv_co_pwrite_zeroes(bs->file, offset, count, flags); |
Laszlo Ersek | e1c66c6 | 2013-08-21 12:41:17 +0200 | [diff] [blame] | 276 | } |
| 277 | |
Eric Blake | 5f61ad0 | 2016-07-15 17:23:04 -0600 | [diff] [blame] | 278 | static int coroutine_fn raw_co_pdiscard(BlockDriverState *bs, |
| 279 | int64_t offset, int count) |
Laszlo Ersek | e1c66c6 | 2013-08-21 12:41:17 +0200 | [diff] [blame] | 280 | { |
Tomáš Golembiovský | 2fdc704 | 2016-10-31 11:27:40 +0100 | [diff] [blame] | 281 | BDRVRawState *s = bs->opaque; |
| 282 | if (offset > UINT64_MAX - s->offset) { |
| 283 | return -EINVAL; |
| 284 | } |
| 285 | offset += s->offset; |
Eric Blake | 5f61ad0 | 2016-07-15 17:23:04 -0600 | [diff] [blame] | 286 | return bdrv_co_pdiscard(bs->file->bs, offset, count); |
Laszlo Ersek | e1c66c6 | 2013-08-21 12:41:17 +0200 | [diff] [blame] | 287 | } |
| 288 | |
Laszlo Ersek | 7a6d3fc | 2013-08-21 12:41:23 +0200 | [diff] [blame] | 289 | static int64_t raw_getlength(BlockDriverState *bs) |
Laszlo Ersek | e1c66c6 | 2013-08-21 12:41:17 +0200 | [diff] [blame] | 290 | { |
Tomáš Golembiovský | 2fdc704 | 2016-10-31 11:27:40 +0100 | [diff] [blame] | 291 | int64_t len; |
| 292 | BDRVRawState *s = bs->opaque; |
| 293 | |
| 294 | /* Update size. It should not change unless the file was externally |
| 295 | * modified. */ |
| 296 | len = bdrv_getlength(bs->file->bs); |
| 297 | if (len < 0) { |
| 298 | return len; |
| 299 | } |
| 300 | |
| 301 | if (len < s->offset) { |
| 302 | s->size = 0; |
| 303 | } else { |
| 304 | if (s->has_size) { |
| 305 | /* Try to honour the size */ |
| 306 | s->size = MIN(s->size, len - s->offset); |
| 307 | } else { |
| 308 | s->size = len - s->offset; |
| 309 | } |
| 310 | } |
| 311 | |
| 312 | return s->size; |
Laszlo Ersek | e1c66c6 | 2013-08-21 12:41:17 +0200 | [diff] [blame] | 313 | } |
| 314 | |
Laszlo Ersek | 7a6d3fc | 2013-08-21 12:41:23 +0200 | [diff] [blame] | 315 | static int raw_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
Laszlo Ersek | e1c66c6 | 2013-08-21 12:41:17 +0200 | [diff] [blame] | 316 | { |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 317 | return bdrv_get_info(bs->file->bs, bdi); |
Laszlo Ersek | e1c66c6 | 2013-08-21 12:41:17 +0200 | [diff] [blame] | 318 | } |
| 319 | |
Eric Blake | decaeed | 2016-07-15 17:23:08 -0600 | [diff] [blame] | 320 | static void raw_refresh_limits(BlockDriverState *bs, Error **errp) |
| 321 | { |
| 322 | if (bs->probed) { |
| 323 | /* To make it easier to protect the first sector, any probed |
| 324 | * image is restricted to read-modify-write on sub-sector |
| 325 | * operations. */ |
| 326 | bs->bl.request_alignment = BDRV_SECTOR_SIZE; |
| 327 | } |
| 328 | } |
| 329 | |
Max Reitz | 4bff28b | 2017-03-28 22:51:28 +0200 | [diff] [blame] | 330 | static int raw_truncate(BlockDriverState *bs, int64_t offset, Error **errp) |
Laszlo Ersek | e1c66c6 | 2013-08-21 12:41:17 +0200 | [diff] [blame] | 331 | { |
Tomáš Golembiovský | 2fdc704 | 2016-10-31 11:27:40 +0100 | [diff] [blame] | 332 | BDRVRawState *s = bs->opaque; |
| 333 | |
| 334 | if (s->has_size) { |
Max Reitz | f59adb3 | 2017-03-28 22:51:29 +0200 | [diff] [blame] | 335 | error_setg(errp, "Cannot resize fixed-size raw disks"); |
Tomáš Golembiovský | 2fdc704 | 2016-10-31 11:27:40 +0100 | [diff] [blame] | 336 | return -ENOTSUP; |
| 337 | } |
| 338 | |
| 339 | if (INT64_MAX - offset < s->offset) { |
Max Reitz | f59adb3 | 2017-03-28 22:51:29 +0200 | [diff] [blame] | 340 | error_setg(errp, "Disk size too large for the chosen offset"); |
Tomáš Golembiovský | 2fdc704 | 2016-10-31 11:27:40 +0100 | [diff] [blame] | 341 | return -EINVAL; |
| 342 | } |
| 343 | |
| 344 | s->size = offset; |
| 345 | offset += s->offset; |
Max Reitz | 4bff28b | 2017-03-28 22:51:28 +0200 | [diff] [blame] | 346 | return bdrv_truncate(bs->file, offset, errp); |
Laszlo Ersek | e1c66c6 | 2013-08-21 12:41:17 +0200 | [diff] [blame] | 347 | } |
| 348 | |
Laszlo Ersek | 7a6d3fc | 2013-08-21 12:41:23 +0200 | [diff] [blame] | 349 | static int raw_media_changed(BlockDriverState *bs) |
Laszlo Ersek | e1c66c6 | 2013-08-21 12:41:17 +0200 | [diff] [blame] | 350 | { |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 351 | return bdrv_media_changed(bs->file->bs); |
Laszlo Ersek | e1c66c6 | 2013-08-21 12:41:17 +0200 | [diff] [blame] | 352 | } |
| 353 | |
Laszlo Ersek | 7a6d3fc | 2013-08-21 12:41:23 +0200 | [diff] [blame] | 354 | static void raw_eject(BlockDriverState *bs, bool eject_flag) |
Laszlo Ersek | e1c66c6 | 2013-08-21 12:41:17 +0200 | [diff] [blame] | 355 | { |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 356 | bdrv_eject(bs->file->bs, eject_flag); |
Laszlo Ersek | e1c66c6 | 2013-08-21 12:41:17 +0200 | [diff] [blame] | 357 | } |
| 358 | |
Laszlo Ersek | 7a6d3fc | 2013-08-21 12:41:23 +0200 | [diff] [blame] | 359 | static void raw_lock_medium(BlockDriverState *bs, bool locked) |
Laszlo Ersek | e1c66c6 | 2013-08-21 12:41:17 +0200 | [diff] [blame] | 360 | { |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 361 | bdrv_lock_medium(bs->file->bs, locked); |
Laszlo Ersek | e1c66c6 | 2013-08-21 12:41:17 +0200 | [diff] [blame] | 362 | } |
| 363 | |
Kevin Wolf | 151a293 | 2016-10-20 15:09:36 +0200 | [diff] [blame] | 364 | static int raw_co_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) |
Laszlo Ersek | e1c66c6 | 2013-08-21 12:41:17 +0200 | [diff] [blame] | 365 | { |
Tomáš Golembiovský | 2fdc704 | 2016-10-31 11:27:40 +0100 | [diff] [blame] | 366 | BDRVRawState *s = bs->opaque; |
| 367 | if (s->offset || s->has_size) { |
| 368 | return -ENOTSUP; |
| 369 | } |
Kevin Wolf | 151a293 | 2016-10-20 15:09:36 +0200 | [diff] [blame] | 370 | return bdrv_co_ioctl(bs->file->bs, req, buf); |
Laszlo Ersek | e1c66c6 | 2013-08-21 12:41:17 +0200 | [diff] [blame] | 371 | } |
| 372 | |
Laszlo Ersek | 7a6d3fc | 2013-08-21 12:41:23 +0200 | [diff] [blame] | 373 | static int raw_has_zero_init(BlockDriverState *bs) |
Laszlo Ersek | e1c66c6 | 2013-08-21 12:41:17 +0200 | [diff] [blame] | 374 | { |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 375 | return bdrv_has_zero_init(bs->file->bs); |
Laszlo Ersek | e1c66c6 | 2013-08-21 12:41:17 +0200 | [diff] [blame] | 376 | } |
| 377 | |
Chunyan Liu | cd3a4cf | 2014-06-05 17:21:03 +0800 | [diff] [blame] | 378 | static int raw_create(const char *filename, QemuOpts *opts, Error **errp) |
Laszlo Ersek | 1565262 | 2013-08-21 12:41:19 +0200 | [diff] [blame] | 379 | { |
Eduardo Habkost | 9be3859 | 2016-06-13 18:57:58 -0300 | [diff] [blame] | 380 | return bdrv_create_file(filename, opts, errp); |
Laszlo Ersek | 1565262 | 2013-08-21 12:41:19 +0200 | [diff] [blame] | 381 | } |
Laszlo Ersek | 01dd96d | 2013-08-21 12:41:20 +0200 | [diff] [blame] | 382 | |
Max Reitz | 015a103 | 2013-09-05 14:22:29 +0200 | [diff] [blame] | 383 | static int raw_open(BlockDriverState *bs, QDict *options, int flags, |
| 384 | Error **errp) |
Laszlo Ersek | 01dd96d | 2013-08-21 12:41:20 +0200 | [diff] [blame] | 385 | { |
Tomáš Golembiovský | 2fdc704 | 2016-10-31 11:27:40 +0100 | [diff] [blame] | 386 | BDRVRawState *s = bs->opaque; |
| 387 | int ret; |
| 388 | |
Kevin Wolf | 4e4bf5c | 2016-12-16 18:52:37 +0100 | [diff] [blame] | 389 | bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file, |
| 390 | false, errp); |
| 391 | if (!bs->file) { |
| 392 | return -EINVAL; |
| 393 | } |
| 394 | |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 395 | bs->sg = bs->file->bs->sg; |
Eric Blake | 8a39b4d | 2016-07-15 12:32:00 -0600 | [diff] [blame] | 396 | bs->supported_write_flags = BDRV_REQ_FUA & |
| 397 | bs->file->bs->supported_write_flags; |
| 398 | bs->supported_zero_flags = (BDRV_REQ_FUA | BDRV_REQ_MAY_UNMAP) & |
| 399 | bs->file->bs->supported_zero_flags; |
Kevin Wolf | 38f3ef5 | 2014-11-20 16:27:12 +0100 | [diff] [blame] | 400 | |
| 401 | if (bs->probed && !bdrv_is_read_only(bs)) { |
| 402 | fprintf(stderr, |
| 403 | "WARNING: Image format was not specified for '%s' and probing " |
| 404 | "guessed raw.\n" |
| 405 | " Automatically detecting the format is dangerous for " |
| 406 | "raw images, write operations on block 0 will be restricted.\n" |
| 407 | " Specify the 'raw' format explicitly to remove the " |
| 408 | "restrictions.\n", |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 409 | bs->file->bs->filename); |
Kevin Wolf | 38f3ef5 | 2014-11-20 16:27:12 +0100 | [diff] [blame] | 410 | } |
| 411 | |
Tomáš Golembiovský | 2fdc704 | 2016-10-31 11:27:40 +0100 | [diff] [blame] | 412 | ret = raw_read_options(options, bs, s, errp); |
| 413 | if (ret < 0) { |
| 414 | return ret; |
| 415 | } |
| 416 | |
| 417 | if (bs->sg && (s->offset || s->has_size)) { |
| 418 | error_setg(errp, "Cannot use offset/size with SCSI generic devices"); |
| 419 | return -EINVAL; |
| 420 | } |
| 421 | |
Laszlo Ersek | 01dd96d | 2013-08-21 12:41:20 +0200 | [diff] [blame] | 422 | return 0; |
| 423 | } |
| 424 | |
Laszlo Ersek | 7a6d3fc | 2013-08-21 12:41:23 +0200 | [diff] [blame] | 425 | static void raw_close(BlockDriverState *bs) |
Laszlo Ersek | 01dd96d | 2013-08-21 12:41:20 +0200 | [diff] [blame] | 426 | { |
| 427 | } |
| 428 | |
Laszlo Ersek | 7a6d3fc | 2013-08-21 12:41:23 +0200 | [diff] [blame] | 429 | static int raw_probe(const uint8_t *buf, int buf_size, const char *filename) |
Laszlo Ersek | 01dd96d | 2013-08-21 12:41:20 +0200 | [diff] [blame] | 430 | { |
| 431 | /* smallest possible positive score so that raw is used if and only if no |
| 432 | * other block driver works |
| 433 | */ |
| 434 | return 1; |
| 435 | } |
Laszlo Ersek | 775d6af | 2013-08-21 12:41:22 +0200 | [diff] [blame] | 436 | |
Ekaterina Tumanova | 1a9335e | 2015-02-16 12:47:56 +0100 | [diff] [blame] | 437 | static int raw_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz) |
| 438 | { |
Tomáš Golembiovský | 2fdc704 | 2016-10-31 11:27:40 +0100 | [diff] [blame] | 439 | BDRVRawState *s = bs->opaque; |
| 440 | int ret; |
| 441 | |
| 442 | ret = bdrv_probe_blocksizes(bs->file->bs, bsz); |
| 443 | if (ret < 0) { |
| 444 | return ret; |
| 445 | } |
| 446 | |
| 447 | if (!QEMU_IS_ALIGNED(s->offset, MAX(bsz->log, bsz->phys))) { |
| 448 | return -ENOTSUP; |
| 449 | } |
| 450 | |
| 451 | return 0; |
Ekaterina Tumanova | 1a9335e | 2015-02-16 12:47:56 +0100 | [diff] [blame] | 452 | } |
| 453 | |
| 454 | static int raw_probe_geometry(BlockDriverState *bs, HDGeometry *geo) |
| 455 | { |
Tomáš Golembiovský | 2fdc704 | 2016-10-31 11:27:40 +0100 | [diff] [blame] | 456 | BDRVRawState *s = bs->opaque; |
| 457 | if (s->offset || s->has_size) { |
| 458 | return -ENOTSUP; |
| 459 | } |
Kevin Wolf | 9a4f4c3 | 2015-06-16 14:19:22 +0200 | [diff] [blame] | 460 | return bdrv_probe_geometry(bs->file->bs, geo); |
Ekaterina Tumanova | 1a9335e | 2015-02-16 12:47:56 +0100 | [diff] [blame] | 461 | } |
| 462 | |
Max Reitz | 5f535a9 | 2014-12-02 18:32:41 +0100 | [diff] [blame] | 463 | BlockDriver bdrv_raw = { |
Laszlo Ersek | 775d6af | 2013-08-21 12:41:22 +0200 | [diff] [blame] | 464 | .format_name = "raw", |
Tomáš Golembiovský | 2fdc704 | 2016-10-31 11:27:40 +0100 | [diff] [blame] | 465 | .instance_size = sizeof(BDRVRawState), |
Laszlo Ersek | 775d6af | 2013-08-21 12:41:22 +0200 | [diff] [blame] | 466 | .bdrv_probe = &raw_probe, |
| 467 | .bdrv_reopen_prepare = &raw_reopen_prepare, |
Tomáš Golembiovský | 2fdc704 | 2016-10-31 11:27:40 +0100 | [diff] [blame] | 468 | .bdrv_reopen_commit = &raw_reopen_commit, |
| 469 | .bdrv_reopen_abort = &raw_reopen_abort, |
Laszlo Ersek | 775d6af | 2013-08-21 12:41:22 +0200 | [diff] [blame] | 470 | .bdrv_open = &raw_open, |
| 471 | .bdrv_close = &raw_close, |
Kevin Wolf | d7010df | 2016-12-15 12:28:58 +0100 | [diff] [blame] | 472 | .bdrv_child_perm = bdrv_filter_default_perms, |
Chunyan Liu | c282e1f | 2014-06-05 17:21:11 +0800 | [diff] [blame] | 473 | .bdrv_create = &raw_create, |
Eric Blake | decaeed | 2016-07-15 17:23:08 -0600 | [diff] [blame] | 474 | .bdrv_co_preadv = &raw_co_preadv, |
| 475 | .bdrv_co_pwritev = &raw_co_pwritev, |
Eric Blake | 39ad937 | 2016-06-01 15:10:11 -0600 | [diff] [blame] | 476 | .bdrv_co_pwrite_zeroes = &raw_co_pwrite_zeroes, |
Eric Blake | 5f61ad0 | 2016-07-15 17:23:04 -0600 | [diff] [blame] | 477 | .bdrv_co_pdiscard = &raw_co_pdiscard, |
Paolo Bonzini | b6b8a33 | 2013-09-04 19:00:28 +0200 | [diff] [blame] | 478 | .bdrv_co_get_block_status = &raw_co_get_block_status, |
Laszlo Ersek | 775d6af | 2013-08-21 12:41:22 +0200 | [diff] [blame] | 479 | .bdrv_truncate = &raw_truncate, |
| 480 | .bdrv_getlength = &raw_getlength, |
Kevin Wolf | b94a261 | 2013-10-29 12:18:58 +0100 | [diff] [blame] | 481 | .has_variable_length = true, |
Laszlo Ersek | 775d6af | 2013-08-21 12:41:22 +0200 | [diff] [blame] | 482 | .bdrv_get_info = &raw_get_info, |
Eric Blake | decaeed | 2016-07-15 17:23:08 -0600 | [diff] [blame] | 483 | .bdrv_refresh_limits = &raw_refresh_limits, |
Ekaterina Tumanova | 1a9335e | 2015-02-16 12:47:56 +0100 | [diff] [blame] | 484 | .bdrv_probe_blocksizes = &raw_probe_blocksizes, |
| 485 | .bdrv_probe_geometry = &raw_probe_geometry, |
Laszlo Ersek | 775d6af | 2013-08-21 12:41:22 +0200 | [diff] [blame] | 486 | .bdrv_media_changed = &raw_media_changed, |
| 487 | .bdrv_eject = &raw_eject, |
| 488 | .bdrv_lock_medium = &raw_lock_medium, |
Kevin Wolf | 151a293 | 2016-10-20 15:09:36 +0200 | [diff] [blame] | 489 | .bdrv_co_ioctl = &raw_co_ioctl, |
Chunyan Liu | cd3a4cf | 2014-06-05 17:21:03 +0800 | [diff] [blame] | 490 | .create_opts = &raw_create_opts, |
Laszlo Ersek | 775d6af | 2013-08-21 12:41:22 +0200 | [diff] [blame] | 491 | .bdrv_has_zero_init = &raw_has_zero_init |
| 492 | }; |
| 493 | |
| 494 | static void bdrv_raw_init(void) |
| 495 | { |
| 496 | bdrv_register(&bdrv_raw); |
| 497 | } |
| 498 | |
| 499 | block_init(bdrv_raw_init); |