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2e6fc7eb | 1 | /* BlockDriver implementation for "raw" format driver |
e1c66c6d | 2 | * |
ad82be2f | 3 | * Copyright (C) 2010-2016 Red Hat, Inc. |
ff369a48 | 4 | * Copyright (C) 2010, Blue Swirl <blauwirbel@gmail.com> |
775d6afd | 5 | * Copyright (C) 2009, Anthony Liguori <aliguori@us.ibm.com> |
e1c66c6d LE |
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 | ||
80c71a24 | 29 | #include "qemu/osdep.h" |
e2c1c34f | 30 | #include "block/block-io.h" |
e1c66c6d | 31 | #include "block/block_int.h" |
da34e65c | 32 | #include "qapi/error.h" |
0b8fa32f | 33 | #include "qemu/module.h" |
ff369a48 | 34 | #include "qemu/option.h" |
5df022cf | 35 | #include "qemu/memalign.h" |
ff369a48 | 36 | |
2fdc7045 TG |
37 | typedef struct BDRVRawState { |
38 | uint64_t offset; | |
39 | uint64_t size; | |
40 | bool has_size; | |
41 | } BDRVRawState; | |
42 | ||
8a2ce0bc AG |
43 | static const char *const mutable_opts[] = { "offset", "size", NULL }; |
44 | ||
2fdc7045 TG |
45 | static QemuOptsList raw_runtime_opts = { |
46 | .name = "raw", | |
47 | .head = QTAILQ_HEAD_INITIALIZER(raw_runtime_opts.head), | |
48 | .desc = { | |
49 | { | |
50 | .name = "offset", | |
51 | .type = QEMU_OPT_SIZE, | |
52 | .help = "offset in the disk where the image starts", | |
53 | }, | |
54 | { | |
55 | .name = "size", | |
56 | .type = QEMU_OPT_SIZE, | |
57 | .help = "virtual disk size", | |
58 | }, | |
59 | { /* end of list */ } | |
60 | }, | |
61 | }; | |
62 | ||
cd3a4cf6 CL |
63 | static QemuOptsList raw_create_opts = { |
64 | .name = "raw-create-opts", | |
65 | .head = QTAILQ_HEAD_INITIALIZER(raw_create_opts.head), | |
66 | .desc = { | |
67 | { | |
68 | .name = BLOCK_OPT_SIZE, | |
69 | .type = QEMU_OPT_SIZE, | |
70 | .help = "Virtual disk size" | |
71 | }, | |
72 | { /* end of list */ } | |
73 | } | |
ff369a48 | 74 | }; |
e1c66c6d | 75 | |
500e2434 HR |
76 | static int raw_read_options(QDict *options, uint64_t *offset, bool *has_size, |
77 | uint64_t *size, Error **errp) | |
2fdc7045 | 78 | { |
2fdc7045 | 79 | QemuOpts *opts = NULL; |
2fdc7045 TG |
80 | int ret; |
81 | ||
2fdc7045 | 82 | opts = qemu_opts_create(&raw_runtime_opts, NULL, 0, &error_abort); |
af175e85 | 83 | if (!qemu_opts_absorb_qdict(opts, options, errp)) { |
2fdc7045 TG |
84 | ret = -EINVAL; |
85 | goto end; | |
86 | } | |
87 | ||
500e2434 HR |
88 | *offset = qemu_opt_get_size(opts, "offset", 0); |
89 | *has_size = qemu_opt_find(opts, "size"); | |
90 | *size = qemu_opt_get_size(opts, "size", 0); | |
40332872 | 91 | |
500e2434 HR |
92 | ret = 0; |
93 | end: | |
94 | qemu_opts_del(opts); | |
95 | return ret; | |
96 | } | |
97 | ||
98 | static int raw_apply_options(BlockDriverState *bs, BDRVRawState *s, | |
99 | uint64_t offset, bool has_size, uint64_t size, | |
100 | Error **errp) | |
101 | { | |
102 | int64_t real_size = 0; | |
103 | ||
104 | real_size = bdrv_getlength(bs->file->bs); | |
105 | if (real_size < 0) { | |
106 | error_setg_errno(errp, -real_size, "Could not get image size"); | |
107 | return real_size; | |
2fdc7045 TG |
108 | } |
109 | ||
110 | /* Check size and offset */ | |
500e2434 HR |
111 | if (offset > real_size) { |
112 | error_setg(errp, "Offset (%" PRIu64 ") cannot be greater than " | |
113 | "size of the containing file (%" PRId64 ")", | |
114 | s->offset, real_size); | |
115 | return -EINVAL; | |
116 | } | |
117 | ||
118 | if (has_size && (real_size - offset) < size) { | |
2fdc7045 | 119 | error_setg(errp, "The sum of offset (%" PRIu64 ") and size " |
500e2434 HR |
120 | "(%" PRIu64 ") has to be smaller or equal to the " |
121 | " actual size of the containing file (%" PRId64 ")", | |
122 | s->offset, s->size, real_size); | |
123 | return -EINVAL; | |
2fdc7045 TG |
124 | } |
125 | ||
126 | /* Make sure size is multiple of BDRV_SECTOR_SIZE to prevent rounding | |
127 | * up and leaking out of the specified area. */ | |
500e2434 | 128 | if (has_size && !QEMU_IS_ALIGNED(size, BDRV_SECTOR_SIZE)) { |
2fdc7045 | 129 | error_setg(errp, "Specified size is not multiple of %llu", |
500e2434 HR |
130 | BDRV_SECTOR_SIZE); |
131 | return -EINVAL; | |
2fdc7045 TG |
132 | } |
133 | ||
500e2434 HR |
134 | s->offset = offset; |
135 | s->has_size = has_size; | |
136 | s->size = has_size ? size : real_size - offset; | |
2fdc7045 | 137 | |
500e2434 | 138 | return 0; |
2fdc7045 TG |
139 | } |
140 | ||
7a6d3fc5 LE |
141 | static int raw_reopen_prepare(BDRVReopenState *reopen_state, |
142 | BlockReopenQueue *queue, Error **errp) | |
e1c66c6d | 143 | { |
500e2434 HR |
144 | bool has_size; |
145 | uint64_t offset, size; | |
146 | int ret; | |
147 | ||
2fdc7045 TG |
148 | assert(reopen_state != NULL); |
149 | assert(reopen_state->bs != NULL); | |
150 | ||
151 | reopen_state->opaque = g_new0(BDRVRawState, 1); | |
152 | ||
500e2434 HR |
153 | ret = raw_read_options(reopen_state->options, &offset, &has_size, &size, |
154 | errp); | |
155 | if (ret < 0) { | |
156 | return ret; | |
157 | } | |
158 | ||
159 | ret = raw_apply_options(reopen_state->bs, reopen_state->opaque, | |
160 | offset, has_size, size, errp); | |
161 | if (ret < 0) { | |
162 | return ret; | |
163 | } | |
164 | ||
165 | return 0; | |
2fdc7045 TG |
166 | } |
167 | ||
168 | static void raw_reopen_commit(BDRVReopenState *state) | |
169 | { | |
170 | BDRVRawState *new_s = state->opaque; | |
171 | BDRVRawState *s = state->bs->opaque; | |
172 | ||
173 | memcpy(s, new_s, sizeof(BDRVRawState)); | |
174 | ||
175 | g_free(state->opaque); | |
176 | state->opaque = NULL; | |
177 | } | |
178 | ||
179 | static void raw_reopen_abort(BDRVReopenState *state) | |
180 | { | |
181 | g_free(state->opaque); | |
182 | state->opaque = NULL; | |
e1c66c6d LE |
183 | } |
184 | ||
38445538 | 185 | /* Check and adjust the offset, against 'offset' and 'size' options. */ |
f7ef38dd VSO |
186 | static inline int raw_adjust_offset(BlockDriverState *bs, int64_t *offset, |
187 | int64_t bytes, bool is_write) | |
38445538 FZ |
188 | { |
189 | BDRVRawState *s = bs->opaque; | |
190 | ||
191 | if (s->has_size && (*offset > s->size || bytes > (s->size - *offset))) { | |
192 | /* There's not enough space for the write, or the read request is | |
193 | * out-of-range. Don't read/write anything to prevent leaking out of | |
194 | * the size specified in options. */ | |
6d6bcc46 | 195 | return is_write ? -ENOSPC : -EINVAL; |
38445538 FZ |
196 | } |
197 | ||
198 | if (*offset > INT64_MAX - s->offset) { | |
199 | return -EINVAL; | |
200 | } | |
201 | *offset += s->offset; | |
202 | ||
203 | return 0; | |
204 | } | |
205 | ||
b9b10c35 KW |
206 | static int coroutine_fn GRAPH_RDLOCK |
207 | raw_co_preadv(BlockDriverState *bs, int64_t offset, int64_t bytes, | |
208 | QEMUIOVector *qiov, BdrvRequestFlags flags) | |
e1c66c6d | 209 | { |
38445538 | 210 | int ret; |
2fdc7045 | 211 | |
38445538 FZ |
212 | ret = raw_adjust_offset(bs, &offset, bytes, false); |
213 | if (ret) { | |
214 | return ret; | |
2fdc7045 | 215 | } |
2fdc7045 | 216 | |
17362398 | 217 | BLKDBG_CO_EVENT(bs->file, BLKDBG_READ_AIO); |
decaeed7 | 218 | return bdrv_co_preadv(bs->file, offset, bytes, qiov, flags); |
e1c66c6d LE |
219 | } |
220 | ||
b9b10c35 KW |
221 | static int coroutine_fn GRAPH_RDLOCK |
222 | raw_co_pwritev(BlockDriverState *bs, int64_t offset, int64_t bytes, | |
223 | QEMUIOVector *qiov, BdrvRequestFlags flags) | |
e1c66c6d | 224 | { |
38f3ef57 KW |
225 | void *buf = NULL; |
226 | BlockDriver *drv; | |
227 | QEMUIOVector local_qiov; | |
228 | int ret; | |
229 | ||
decaeed7 EB |
230 | if (bs->probed && offset < BLOCK_PROBE_BUF_SIZE && bytes) { |
231 | /* Handling partial writes would be a pain - so we just | |
232 | * require that guests have 512-byte request alignment if | |
233 | * probing occurred */ | |
38f3ef57 KW |
234 | QEMU_BUILD_BUG_ON(BLOCK_PROBE_BUF_SIZE != 512); |
235 | QEMU_BUILD_BUG_ON(BDRV_SECTOR_SIZE != 512); | |
decaeed7 | 236 | assert(offset == 0 && bytes >= BLOCK_PROBE_BUF_SIZE); |
38f3ef57 | 237 | |
9a4f4c31 | 238 | buf = qemu_try_blockalign(bs->file->bs, 512); |
38f3ef57 KW |
239 | if (!buf) { |
240 | ret = -ENOMEM; | |
241 | goto fail; | |
242 | } | |
243 | ||
244 | ret = qemu_iovec_to_buf(qiov, 0, buf, 512); | |
245 | if (ret != 512) { | |
246 | ret = -EINVAL; | |
247 | goto fail; | |
248 | } | |
249 | ||
250 | drv = bdrv_probe_all(buf, 512, NULL); | |
251 | if (drv != bs->drv) { | |
252 | ret = -EPERM; | |
253 | goto fail; | |
254 | } | |
255 | ||
256 | /* Use the checked buffer, a malicious guest might be overwriting its | |
257 | * original buffer in the background. */ | |
258 | qemu_iovec_init(&local_qiov, qiov->niov + 1); | |
259 | qemu_iovec_add(&local_qiov, buf, 512); | |
260 | qemu_iovec_concat(&local_qiov, qiov, 512, qiov->size - 512); | |
261 | qiov = &local_qiov; | |
e8b65355 SH |
262 | |
263 | flags &= ~BDRV_REQ_REGISTERED_BUF; | |
38f3ef57 KW |
264 | } |
265 | ||
e75abeda | 266 | ret = raw_adjust_offset(bs, &offset, bytes, true); |
38445538 FZ |
267 | if (ret) { |
268 | goto fail; | |
269 | } | |
2fdc7045 | 270 | |
17362398 | 271 | BLKDBG_CO_EVENT(bs->file, BLKDBG_WRITE_AIO); |
decaeed7 | 272 | ret = bdrv_co_pwritev(bs->file, offset, bytes, qiov, flags); |
38f3ef57 KW |
273 | |
274 | fail: | |
275 | if (qiov == &local_qiov) { | |
276 | qemu_iovec_destroy(&local_qiov); | |
277 | } | |
278 | qemu_vfree(buf); | |
279 | return ret; | |
e1c66c6d LE |
280 | } |
281 | ||
d41aa7e3 EB |
282 | static int coroutine_fn raw_co_block_status(BlockDriverState *bs, |
283 | bool want_zero, int64_t offset, | |
284 | int64_t bytes, int64_t *pnum, | |
285 | int64_t *map, | |
67a0fd2a | 286 | BlockDriverState **file) |
e1c66c6d | 287 | { |
2fdc7045 | 288 | BDRVRawState *s = bs->opaque; |
d41aa7e3 | 289 | *pnum = bytes; |
02650acb | 290 | *file = bs->file->bs; |
d41aa7e3 EB |
291 | *map = offset + s->offset; |
292 | return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID; | |
e1c66c6d LE |
293 | } |
294 | ||
abaf8b75 KW |
295 | static int coroutine_fn GRAPH_RDLOCK |
296 | raw_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset, int64_t bytes, | |
297 | BdrvRequestFlags flags) | |
e1c66c6d | 298 | { |
38445538 FZ |
299 | int ret; |
300 | ||
f7ef38dd | 301 | ret = raw_adjust_offset(bs, &offset, bytes, true); |
38445538 FZ |
302 | if (ret) { |
303 | return ret; | |
2fdc7045 | 304 | } |
f5a5ca79 | 305 | return bdrv_co_pwrite_zeroes(bs->file, offset, bytes, flags); |
e1c66c6d LE |
306 | } |
307 | ||
9a5a1c62 EGE |
308 | static int coroutine_fn GRAPH_RDLOCK |
309 | raw_co_pdiscard(BlockDriverState *bs, int64_t offset, int64_t bytes) | |
e1c66c6d | 310 | { |
38445538 FZ |
311 | int ret; |
312 | ||
f7ef38dd | 313 | ret = raw_adjust_offset(bs, &offset, bytes, true); |
38445538 FZ |
314 | if (ret) { |
315 | return ret; | |
2fdc7045 | 316 | } |
0b9fd3f4 | 317 | return bdrv_co_pdiscard(bs->file, offset, bytes); |
e1c66c6d LE |
318 | } |
319 | ||
50c4bcd4 SL |
320 | static int coroutine_fn GRAPH_RDLOCK |
321 | raw_co_zone_report(BlockDriverState *bs, int64_t offset, | |
322 | unsigned int *nr_zones, | |
323 | BlockZoneDescriptor *zones) | |
324 | { | |
325 | return bdrv_co_zone_report(bs->file->bs, offset, nr_zones, zones); | |
326 | } | |
327 | ||
328 | static int coroutine_fn GRAPH_RDLOCK | |
329 | raw_co_zone_mgmt(BlockDriverState *bs, BlockZoneOp op, | |
330 | int64_t offset, int64_t len) | |
331 | { | |
332 | return bdrv_co_zone_mgmt(bs->file->bs, op, offset, len); | |
333 | } | |
334 | ||
4751d09a SL |
335 | static int coroutine_fn GRAPH_RDLOCK |
336 | raw_co_zone_append(BlockDriverState *bs,int64_t *offset, QEMUIOVector *qiov, | |
337 | BdrvRequestFlags flags) | |
338 | { | |
339 | return bdrv_co_zone_append(bs->file->bs, offset, qiov, flags); | |
340 | } | |
341 | ||
8ab8140a KW |
342 | static int64_t coroutine_fn GRAPH_RDLOCK |
343 | raw_co_getlength(BlockDriverState *bs) | |
e1c66c6d | 344 | { |
2fdc7045 TG |
345 | int64_t len; |
346 | BDRVRawState *s = bs->opaque; | |
347 | ||
348 | /* Update size. It should not change unless the file was externally | |
349 | * modified. */ | |
c86422c5 | 350 | len = bdrv_co_getlength(bs->file->bs); |
2fdc7045 TG |
351 | if (len < 0) { |
352 | return len; | |
353 | } | |
354 | ||
355 | if (len < s->offset) { | |
356 | s->size = 0; | |
357 | } else { | |
358 | if (s->has_size) { | |
359 | /* Try to honour the size */ | |
360 | s->size = MIN(s->size, len - s->offset); | |
361 | } else { | |
362 | s->size = len - s->offset; | |
363 | } | |
364 | } | |
365 | ||
366 | return s->size; | |
e1c66c6d LE |
367 | } |
368 | ||
a843a22a SH |
369 | static BlockMeasureInfo *raw_measure(QemuOpts *opts, BlockDriverState *in_bs, |
370 | Error **errp) | |
371 | { | |
372 | BlockMeasureInfo *info; | |
373 | int64_t required; | |
374 | ||
375 | if (in_bs) { | |
376 | required = bdrv_getlength(in_bs); | |
377 | if (required < 0) { | |
378 | error_setg_errno(errp, -required, "Unable to get image size"); | |
379 | return NULL; | |
380 | } | |
381 | } else { | |
382 | required = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), | |
383 | BDRV_SECTOR_SIZE); | |
384 | } | |
385 | ||
5d72c68b | 386 | info = g_new0(BlockMeasureInfo, 1); |
a843a22a SH |
387 | info->required = required; |
388 | ||
389 | /* Unallocated sectors count towards the file size in raw images */ | |
390 | info->fully_allocated = info->required; | |
391 | return info; | |
392 | } | |
393 | ||
a00e70c0 | 394 | static int coroutine_fn GRAPH_RDLOCK |
3d47eb0a | 395 | raw_co_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
e1c66c6d | 396 | { |
3d47eb0a | 397 | return bdrv_co_get_info(bs->file->bs, bdi); |
e1c66c6d LE |
398 | } |
399 | ||
decaeed7 EB |
400 | static void raw_refresh_limits(BlockDriverState *bs, Error **errp) |
401 | { | |
8c6f27e7 PB |
402 | bs->bl.has_variable_length = bs->file->bs->bl.has_variable_length; |
403 | ||
decaeed7 EB |
404 | if (bs->probed) { |
405 | /* To make it easier to protect the first sector, any probed | |
406 | * image is restricted to read-modify-write on sub-sector | |
407 | * operations. */ | |
408 | bs->bl.request_alignment = BDRV_SECTOR_SIZE; | |
409 | } | |
410 | } | |
411 | ||
c2b8e315 KW |
412 | static int coroutine_fn GRAPH_RDLOCK |
413 | raw_co_truncate(BlockDriverState *bs, int64_t offset, bool exact, | |
414 | PreallocMode prealloc, BdrvRequestFlags flags, Error **errp) | |
e1c66c6d | 415 | { |
2fdc7045 TG |
416 | BDRVRawState *s = bs->opaque; |
417 | ||
418 | if (s->has_size) { | |
f59adb32 | 419 | error_setg(errp, "Cannot resize fixed-size raw disks"); |
2fdc7045 TG |
420 | return -ENOTSUP; |
421 | } | |
422 | ||
423 | if (INT64_MAX - offset < s->offset) { | |
f59adb32 | 424 | error_setg(errp, "Disk size too large for the chosen offset"); |
2fdc7045 TG |
425 | return -EINVAL; |
426 | } | |
427 | ||
428 | s->size = offset; | |
429 | offset += s->offset; | |
1ddaabae | 430 | return bdrv_co_truncate(bs->file, offset, exact, prealloc, flags, errp); |
e1c66c6d LE |
431 | } |
432 | ||
79a292e5 KW |
433 | static void coroutine_fn GRAPH_RDLOCK |
434 | raw_co_eject(BlockDriverState *bs, bool eject_flag) | |
e1c66c6d | 435 | { |
2531b390 | 436 | bdrv_co_eject(bs->file->bs, eject_flag); |
e1c66c6d LE |
437 | } |
438 | ||
79a292e5 KW |
439 | static void coroutine_fn GRAPH_RDLOCK |
440 | raw_co_lock_medium(BlockDriverState *bs, bool locked) | |
e1c66c6d | 441 | { |
2c75261c | 442 | bdrv_co_lock_medium(bs->file->bs, locked); |
e1c66c6d LE |
443 | } |
444 | ||
26c518ab KW |
445 | static int coroutine_fn GRAPH_RDLOCK |
446 | raw_co_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) | |
e1c66c6d | 447 | { |
2fdc7045 TG |
448 | BDRVRawState *s = bs->opaque; |
449 | if (s->offset || s->has_size) { | |
450 | return -ENOTSUP; | |
451 | } | |
151a2930 | 452 | return bdrv_co_ioctl(bs->file->bs, req, buf); |
e1c66c6d LE |
453 | } |
454 | ||
7a6d3fc5 | 455 | static int raw_has_zero_init(BlockDriverState *bs) |
e1c66c6d | 456 | { |
9a4f4c31 | 457 | return bdrv_has_zero_init(bs->file->bs); |
e1c66c6d LE |
458 | } |
459 | ||
4db7ba3b | 460 | static int coroutine_fn GRAPH_UNLOCKED |
4ec8df01 KW |
461 | raw_co_create_opts(BlockDriver *drv, const char *filename, |
462 | QemuOpts *opts, Error **errp) | |
1565262c | 463 | { |
2475a0d0 | 464 | return bdrv_co_create_file(filename, opts, errp); |
1565262c | 465 | } |
01dd96d8 | 466 | |
015a1036 HR |
467 | static int raw_open(BlockDriverState *bs, QDict *options, int flags, |
468 | Error **errp) | |
01dd96d8 | 469 | { |
2fdc7045 | 470 | BDRVRawState *s = bs->opaque; |
6e012159 | 471 | AioContext *ctx; |
500e2434 HR |
472 | bool has_size; |
473 | uint64_t offset, size; | |
58944401 | 474 | BdrvChildRole file_role; |
2fdc7045 TG |
475 | int ret; |
476 | ||
500e2434 HR |
477 | ret = raw_read_options(options, &offset, &has_size, &size, errp); |
478 | if (ret < 0) { | |
479 | return ret; | |
480 | } | |
481 | ||
58944401 HR |
482 | /* |
483 | * Without offset and a size limit, this driver behaves very much | |
484 | * like a filter. With any such limit, it does not. | |
485 | */ | |
486 | if (offset || has_size) { | |
487 | file_role = BDRV_CHILD_DATA | BDRV_CHILD_PRIMARY; | |
488 | } else { | |
489 | file_role = BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY; | |
490 | } | |
491 | ||
5bb04747 VSO |
492 | bdrv_open_child(NULL, options, "file", bs, &child_of_bds, |
493 | file_role, false, errp); | |
4e4bf5c4 KW |
494 | if (!bs->file) { |
495 | return -EINVAL; | |
496 | } | |
497 | ||
006e1962 | 498 | bs->sg = bdrv_is_sg(bs->file->bs); |
228345bf HR |
499 | bs->supported_write_flags = BDRV_REQ_WRITE_UNCHANGED | |
500 | (BDRV_REQ_FUA & bs->file->bs->supported_write_flags); | |
501 | bs->supported_zero_flags = BDRV_REQ_WRITE_UNCHANGED | | |
80f5c33f | 502 | ((BDRV_REQ_FUA | BDRV_REQ_MAY_UNMAP | BDRV_REQ_NO_FALLBACK) & |
228345bf | 503 | bs->file->bs->supported_zero_flags); |
1ddaabae KW |
504 | bs->supported_truncate_flags = bs->file->bs->supported_truncate_flags & |
505 | BDRV_REQ_ZERO_WRITE; | |
38f3ef57 KW |
506 | |
507 | if (bs->probed && !bdrv_is_read_only(bs)) { | |
b7cfc7d5 | 508 | bdrv_graph_rdlock_main_loop(); |
f30c66ba | 509 | bdrv_refresh_filename(bs->file->bs); |
b7cfc7d5 | 510 | bdrv_graph_rdunlock_main_loop(); |
38f3ef57 KW |
511 | fprintf(stderr, |
512 | "WARNING: Image format was not specified for '%s' and probing " | |
513 | "guessed raw.\n" | |
514 | " Automatically detecting the format is dangerous for " | |
515 | "raw images, write operations on block 0 will be restricted.\n" | |
516 | " Specify the 'raw' format explicitly to remove the " | |
517 | "restrictions.\n", | |
9a4f4c31 | 518 | bs->file->bs->filename); |
38f3ef57 KW |
519 | } |
520 | ||
6e012159 KW |
521 | ctx = bdrv_get_aio_context(bs); |
522 | aio_context_acquire(ctx); | |
500e2434 | 523 | ret = raw_apply_options(bs, s, offset, has_size, size, errp); |
6e012159 KW |
524 | aio_context_release(ctx); |
525 | ||
2fdc7045 TG |
526 | if (ret < 0) { |
527 | return ret; | |
528 | } | |
529 | ||
006e1962 | 530 | if (bdrv_is_sg(bs) && (s->offset || s->has_size)) { |
2fdc7045 TG |
531 | error_setg(errp, "Cannot use offset/size with SCSI generic devices"); |
532 | return -EINVAL; | |
533 | } | |
534 | ||
01dd96d8 LE |
535 | return 0; |
536 | } | |
537 | ||
7a6d3fc5 | 538 | static int raw_probe(const uint8_t *buf, int buf_size, const char *filename) |
01dd96d8 LE |
539 | { |
540 | /* smallest possible positive score so that raw is used if and only if no | |
541 | * other block driver works | |
542 | */ | |
543 | return 1; | |
544 | } | |
775d6afd | 545 | |
1a9335e4 ET |
546 | static int raw_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz) |
547 | { | |
2fdc7045 TG |
548 | BDRVRawState *s = bs->opaque; |
549 | int ret; | |
550 | ||
551 | ret = bdrv_probe_blocksizes(bs->file->bs, bsz); | |
552 | if (ret < 0) { | |
553 | return ret; | |
554 | } | |
555 | ||
556 | if (!QEMU_IS_ALIGNED(s->offset, MAX(bsz->log, bsz->phys))) { | |
557 | return -ENOTSUP; | |
558 | } | |
559 | ||
560 | return 0; | |
1a9335e4 ET |
561 | } |
562 | ||
563 | static int raw_probe_geometry(BlockDriverState *bs, HDGeometry *geo) | |
564 | { | |
2fdc7045 TG |
565 | BDRVRawState *s = bs->opaque; |
566 | if (s->offset || s->has_size) { | |
567 | return -ENOTSUP; | |
568 | } | |
9a4f4c31 | 569 | return bdrv_probe_geometry(bs->file->bs, geo); |
1a9335e4 ET |
570 | } |
571 | ||
742bf09b EGE |
572 | static int coroutine_fn GRAPH_RDLOCK |
573 | raw_co_copy_range_from(BlockDriverState *bs, | |
574 | BdrvChild *src, int64_t src_offset, | |
575 | BdrvChild *dst, int64_t dst_offset, | |
576 | int64_t bytes, BdrvRequestFlags read_flags, | |
577 | BdrvRequestFlags write_flags) | |
72d219e2 FZ |
578 | { |
579 | int ret; | |
580 | ||
48535049 | 581 | ret = raw_adjust_offset(bs, &src_offset, bytes, false); |
72d219e2 FZ |
582 | if (ret) { |
583 | return ret; | |
584 | } | |
585 | return bdrv_co_copy_range_from(bs->file, src_offset, dst, dst_offset, | |
67b51fb9 | 586 | bytes, read_flags, write_flags); |
72d219e2 FZ |
587 | } |
588 | ||
742bf09b EGE |
589 | static int coroutine_fn GRAPH_RDLOCK |
590 | raw_co_copy_range_to(BlockDriverState *bs, | |
591 | BdrvChild *src, int64_t src_offset, | |
592 | BdrvChild *dst, int64_t dst_offset, | |
593 | int64_t bytes, BdrvRequestFlags read_flags, | |
594 | BdrvRequestFlags write_flags) | |
72d219e2 FZ |
595 | { |
596 | int ret; | |
597 | ||
48535049 | 598 | ret = raw_adjust_offset(bs, &dst_offset, bytes, true); |
72d219e2 FZ |
599 | if (ret) { |
600 | return ret; | |
601 | } | |
602 | return bdrv_co_copy_range_to(src, src_offset, bs->file, dst_offset, bytes, | |
67b51fb9 | 603 | read_flags, write_flags); |
72d219e2 FZ |
604 | } |
605 | ||
2654267c HR |
606 | static const char *const raw_strong_runtime_opts[] = { |
607 | "offset", | |
608 | "size", | |
609 | ||
610 | NULL | |
611 | }; | |
612 | ||
3fc1ec37 VSO |
613 | static void raw_cancel_in_flight(BlockDriverState *bs) |
614 | { | |
615 | bdrv_cancel_in_flight(bs->file->bs); | |
616 | } | |
617 | ||
b68ce824 SH |
618 | static void raw_child_perm(BlockDriverState *bs, BdrvChild *c, |
619 | BdrvChildRole role, | |
620 | BlockReopenQueue *reopen_queue, | |
621 | uint64_t parent_perm, uint64_t parent_shared, | |
622 | uint64_t *nperm, uint64_t *nshared) | |
623 | { | |
624 | bdrv_default_perms(bs, c, role, reopen_queue, parent_perm, | |
625 | parent_shared, nperm, nshared); | |
626 | ||
627 | /* | |
628 | * bdrv_default_perms() may add WRITE and/or RESIZE (see comment in | |
629 | * bdrv_default_perms_for_storage() for an explanation) but we only need | |
630 | * them if they are in parent_perm. Drop WRITE and RESIZE whenever possible | |
631 | * to avoid permission conflicts. | |
632 | */ | |
633 | *nperm &= ~(BLK_PERM_WRITE | BLK_PERM_RESIZE); | |
634 | *nperm |= parent_perm & (BLK_PERM_WRITE | BLK_PERM_RESIZE); | |
635 | } | |
636 | ||
5f535a94 | 637 | BlockDriver bdrv_raw = { |
775d6afd | 638 | .format_name = "raw", |
2fdc7045 | 639 | .instance_size = sizeof(BDRVRawState), |
774c726c | 640 | .supports_zoned_children = true, |
775d6afd LE |
641 | .bdrv_probe = &raw_probe, |
642 | .bdrv_reopen_prepare = &raw_reopen_prepare, | |
2fdc7045 TG |
643 | .bdrv_reopen_commit = &raw_reopen_commit, |
644 | .bdrv_reopen_abort = &raw_reopen_abort, | |
775d6afd | 645 | .bdrv_open = &raw_open, |
b68ce824 | 646 | .bdrv_child_perm = raw_child_perm, |
efc75e2a | 647 | .bdrv_co_create_opts = &raw_co_create_opts, |
decaeed7 EB |
648 | .bdrv_co_preadv = &raw_co_preadv, |
649 | .bdrv_co_pwritev = &raw_co_pwritev, | |
39ad937e | 650 | .bdrv_co_pwrite_zeroes = &raw_co_pwrite_zeroes, |
5f61ad07 | 651 | .bdrv_co_pdiscard = &raw_co_pdiscard, |
50c4bcd4 SL |
652 | .bdrv_co_zone_report = &raw_co_zone_report, |
653 | .bdrv_co_zone_mgmt = &raw_co_zone_mgmt, | |
4751d09a | 654 | .bdrv_co_zone_append = &raw_co_zone_append, |
d41aa7e3 | 655 | .bdrv_co_block_status = &raw_co_block_status, |
72d219e2 FZ |
656 | .bdrv_co_copy_range_from = &raw_co_copy_range_from, |
657 | .bdrv_co_copy_range_to = &raw_co_copy_range_to, | |
061ca8a3 | 658 | .bdrv_co_truncate = &raw_co_truncate, |
c86422c5 | 659 | .bdrv_co_getlength = &raw_co_getlength, |
d67066d8 | 660 | .is_format = true, |
a843a22a | 661 | .bdrv_measure = &raw_measure, |
3d47eb0a | 662 | .bdrv_co_get_info = &raw_co_get_info, |
decaeed7 | 663 | .bdrv_refresh_limits = &raw_refresh_limits, |
1a9335e4 ET |
664 | .bdrv_probe_blocksizes = &raw_probe_blocksizes, |
665 | .bdrv_probe_geometry = &raw_probe_geometry, | |
2531b390 | 666 | .bdrv_co_eject = &raw_co_eject, |
2c75261c | 667 | .bdrv_co_lock_medium = &raw_co_lock_medium, |
151a2930 | 668 | .bdrv_co_ioctl = &raw_co_ioctl, |
cd3a4cf6 | 669 | .create_opts = &raw_create_opts, |
2654267c HR |
670 | .bdrv_has_zero_init = &raw_has_zero_init, |
671 | .strong_runtime_opts = raw_strong_runtime_opts, | |
8a2ce0bc | 672 | .mutable_opts = mutable_opts, |
3fc1ec37 | 673 | .bdrv_cancel_in_flight = raw_cancel_in_flight, |
775d6afd LE |
674 | }; |
675 | ||
676 | static void bdrv_raw_init(void) | |
677 | { | |
678 | bdrv_register(&bdrv_raw); | |
679 | } | |
680 | ||
681 | block_init(bdrv_raw_init); |