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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 | ||
1f051dcb KW |
98 | static int GRAPH_RDLOCK |
99 | raw_apply_options(BlockDriverState *bs, BDRVRawState *s, uint64_t offset, | |
100 | bool has_size, uint64_t size, Error **errp) | |
500e2434 HR |
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 | ||
1f051dcb KW |
148 | GLOBAL_STATE_CODE(); |
149 | GRAPH_RDLOCK_GUARD_MAINLOOP(); | |
150 | ||
2fdc7045 TG |
151 | assert(reopen_state != NULL); |
152 | assert(reopen_state->bs != NULL); | |
153 | ||
154 | reopen_state->opaque = g_new0(BDRVRawState, 1); | |
155 | ||
500e2434 HR |
156 | ret = raw_read_options(reopen_state->options, &offset, &has_size, &size, |
157 | errp); | |
158 | if (ret < 0) { | |
159 | return ret; | |
160 | } | |
161 | ||
162 | ret = raw_apply_options(reopen_state->bs, reopen_state->opaque, | |
163 | offset, has_size, size, errp); | |
164 | if (ret < 0) { | |
165 | return ret; | |
166 | } | |
167 | ||
168 | return 0; | |
2fdc7045 TG |
169 | } |
170 | ||
171 | static void raw_reopen_commit(BDRVReopenState *state) | |
172 | { | |
173 | BDRVRawState *new_s = state->opaque; | |
174 | BDRVRawState *s = state->bs->opaque; | |
175 | ||
176 | memcpy(s, new_s, sizeof(BDRVRawState)); | |
177 | ||
178 | g_free(state->opaque); | |
179 | state->opaque = NULL; | |
180 | } | |
181 | ||
182 | static void raw_reopen_abort(BDRVReopenState *state) | |
183 | { | |
184 | g_free(state->opaque); | |
185 | state->opaque = NULL; | |
e1c66c6d LE |
186 | } |
187 | ||
38445538 | 188 | /* Check and adjust the offset, against 'offset' and 'size' options. */ |
f7ef38dd VSO |
189 | static inline int raw_adjust_offset(BlockDriverState *bs, int64_t *offset, |
190 | int64_t bytes, bool is_write) | |
38445538 FZ |
191 | { |
192 | BDRVRawState *s = bs->opaque; | |
193 | ||
194 | if (s->has_size && (*offset > s->size || bytes > (s->size - *offset))) { | |
195 | /* There's not enough space for the write, or the read request is | |
196 | * out-of-range. Don't read/write anything to prevent leaking out of | |
197 | * the size specified in options. */ | |
6d6bcc46 | 198 | return is_write ? -ENOSPC : -EINVAL; |
38445538 FZ |
199 | } |
200 | ||
201 | if (*offset > INT64_MAX - s->offset) { | |
202 | return -EINVAL; | |
203 | } | |
204 | *offset += s->offset; | |
205 | ||
206 | return 0; | |
207 | } | |
208 | ||
b9b10c35 KW |
209 | static int coroutine_fn GRAPH_RDLOCK |
210 | raw_co_preadv(BlockDriverState *bs, int64_t offset, int64_t bytes, | |
211 | QEMUIOVector *qiov, BdrvRequestFlags flags) | |
e1c66c6d | 212 | { |
38445538 | 213 | int ret; |
2fdc7045 | 214 | |
38445538 FZ |
215 | ret = raw_adjust_offset(bs, &offset, bytes, false); |
216 | if (ret) { | |
217 | return ret; | |
2fdc7045 | 218 | } |
2fdc7045 | 219 | |
17362398 | 220 | BLKDBG_CO_EVENT(bs->file, BLKDBG_READ_AIO); |
decaeed7 | 221 | return bdrv_co_preadv(bs->file, offset, bytes, qiov, flags); |
e1c66c6d LE |
222 | } |
223 | ||
b9b10c35 KW |
224 | static int coroutine_fn GRAPH_RDLOCK |
225 | raw_co_pwritev(BlockDriverState *bs, int64_t offset, int64_t bytes, | |
226 | QEMUIOVector *qiov, BdrvRequestFlags flags) | |
e1c66c6d | 227 | { |
38f3ef57 KW |
228 | void *buf = NULL; |
229 | BlockDriver *drv; | |
230 | QEMUIOVector local_qiov; | |
231 | int ret; | |
232 | ||
decaeed7 EB |
233 | if (bs->probed && offset < BLOCK_PROBE_BUF_SIZE && bytes) { |
234 | /* Handling partial writes would be a pain - so we just | |
235 | * require that guests have 512-byte request alignment if | |
236 | * probing occurred */ | |
38f3ef57 KW |
237 | QEMU_BUILD_BUG_ON(BLOCK_PROBE_BUF_SIZE != 512); |
238 | QEMU_BUILD_BUG_ON(BDRV_SECTOR_SIZE != 512); | |
decaeed7 | 239 | assert(offset == 0 && bytes >= BLOCK_PROBE_BUF_SIZE); |
38f3ef57 | 240 | |
9a4f4c31 | 241 | buf = qemu_try_blockalign(bs->file->bs, 512); |
38f3ef57 KW |
242 | if (!buf) { |
243 | ret = -ENOMEM; | |
244 | goto fail; | |
245 | } | |
246 | ||
247 | ret = qemu_iovec_to_buf(qiov, 0, buf, 512); | |
248 | if (ret != 512) { | |
249 | ret = -EINVAL; | |
250 | goto fail; | |
251 | } | |
252 | ||
253 | drv = bdrv_probe_all(buf, 512, NULL); | |
254 | if (drv != bs->drv) { | |
255 | ret = -EPERM; | |
256 | goto fail; | |
257 | } | |
258 | ||
259 | /* Use the checked buffer, a malicious guest might be overwriting its | |
260 | * original buffer in the background. */ | |
261 | qemu_iovec_init(&local_qiov, qiov->niov + 1); | |
262 | qemu_iovec_add(&local_qiov, buf, 512); | |
263 | qemu_iovec_concat(&local_qiov, qiov, 512, qiov->size - 512); | |
264 | qiov = &local_qiov; | |
e8b65355 SH |
265 | |
266 | flags &= ~BDRV_REQ_REGISTERED_BUF; | |
38f3ef57 KW |
267 | } |
268 | ||
e75abeda | 269 | ret = raw_adjust_offset(bs, &offset, bytes, true); |
38445538 FZ |
270 | if (ret) { |
271 | goto fail; | |
272 | } | |
2fdc7045 | 273 | |
17362398 | 274 | BLKDBG_CO_EVENT(bs->file, BLKDBG_WRITE_AIO); |
decaeed7 | 275 | ret = bdrv_co_pwritev(bs->file, offset, bytes, qiov, flags); |
38f3ef57 KW |
276 | |
277 | fail: | |
278 | if (qiov == &local_qiov) { | |
279 | qemu_iovec_destroy(&local_qiov); | |
280 | } | |
281 | qemu_vfree(buf); | |
282 | return ret; | |
e1c66c6d LE |
283 | } |
284 | ||
79a55866 KW |
285 | static int coroutine_fn GRAPH_RDLOCK |
286 | raw_co_block_status(BlockDriverState *bs, bool want_zero, int64_t offset, | |
287 | int64_t bytes, int64_t *pnum, int64_t *map, | |
288 | BlockDriverState **file) | |
e1c66c6d | 289 | { |
2fdc7045 | 290 | BDRVRawState *s = bs->opaque; |
d41aa7e3 | 291 | *pnum = bytes; |
02650acb | 292 | *file = bs->file->bs; |
d41aa7e3 EB |
293 | *map = offset + s->offset; |
294 | return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID; | |
e1c66c6d LE |
295 | } |
296 | ||
abaf8b75 KW |
297 | static int coroutine_fn GRAPH_RDLOCK |
298 | raw_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset, int64_t bytes, | |
299 | BdrvRequestFlags flags) | |
e1c66c6d | 300 | { |
38445538 FZ |
301 | int ret; |
302 | ||
f7ef38dd | 303 | ret = raw_adjust_offset(bs, &offset, bytes, true); |
38445538 FZ |
304 | if (ret) { |
305 | return ret; | |
2fdc7045 | 306 | } |
f5a5ca79 | 307 | return bdrv_co_pwrite_zeroes(bs->file, offset, bytes, flags); |
e1c66c6d LE |
308 | } |
309 | ||
9a5a1c62 EGE |
310 | static int coroutine_fn GRAPH_RDLOCK |
311 | raw_co_pdiscard(BlockDriverState *bs, int64_t offset, int64_t bytes) | |
e1c66c6d | 312 | { |
38445538 FZ |
313 | int ret; |
314 | ||
f7ef38dd | 315 | ret = raw_adjust_offset(bs, &offset, bytes, true); |
38445538 FZ |
316 | if (ret) { |
317 | return ret; | |
2fdc7045 | 318 | } |
0b9fd3f4 | 319 | return bdrv_co_pdiscard(bs->file, offset, bytes); |
e1c66c6d LE |
320 | } |
321 | ||
50c4bcd4 SL |
322 | static int coroutine_fn GRAPH_RDLOCK |
323 | raw_co_zone_report(BlockDriverState *bs, int64_t offset, | |
324 | unsigned int *nr_zones, | |
325 | BlockZoneDescriptor *zones) | |
326 | { | |
327 | return bdrv_co_zone_report(bs->file->bs, offset, nr_zones, zones); | |
328 | } | |
329 | ||
330 | static int coroutine_fn GRAPH_RDLOCK | |
331 | raw_co_zone_mgmt(BlockDriverState *bs, BlockZoneOp op, | |
332 | int64_t offset, int64_t len) | |
333 | { | |
334 | return bdrv_co_zone_mgmt(bs->file->bs, op, offset, len); | |
335 | } | |
336 | ||
4751d09a SL |
337 | static int coroutine_fn GRAPH_RDLOCK |
338 | raw_co_zone_append(BlockDriverState *bs,int64_t *offset, QEMUIOVector *qiov, | |
339 | BdrvRequestFlags flags) | |
340 | { | |
341 | return bdrv_co_zone_append(bs->file->bs, offset, qiov, flags); | |
342 | } | |
343 | ||
8ab8140a KW |
344 | static int64_t coroutine_fn GRAPH_RDLOCK |
345 | raw_co_getlength(BlockDriverState *bs) | |
e1c66c6d | 346 | { |
2fdc7045 TG |
347 | int64_t len; |
348 | BDRVRawState *s = bs->opaque; | |
349 | ||
350 | /* Update size. It should not change unless the file was externally | |
351 | * modified. */ | |
c86422c5 | 352 | len = bdrv_co_getlength(bs->file->bs); |
2fdc7045 TG |
353 | if (len < 0) { |
354 | return len; | |
355 | } | |
356 | ||
357 | if (len < s->offset) { | |
358 | s->size = 0; | |
359 | } else { | |
360 | if (s->has_size) { | |
361 | /* Try to honour the size */ | |
362 | s->size = MIN(s->size, len - s->offset); | |
363 | } else { | |
364 | s->size = len - s->offset; | |
365 | } | |
366 | } | |
367 | ||
368 | return s->size; | |
e1c66c6d LE |
369 | } |
370 | ||
a843a22a SH |
371 | static BlockMeasureInfo *raw_measure(QemuOpts *opts, BlockDriverState *in_bs, |
372 | Error **errp) | |
373 | { | |
374 | BlockMeasureInfo *info; | |
375 | int64_t required; | |
376 | ||
377 | if (in_bs) { | |
378 | required = bdrv_getlength(in_bs); | |
379 | if (required < 0) { | |
380 | error_setg_errno(errp, -required, "Unable to get image size"); | |
381 | return NULL; | |
382 | } | |
383 | } else { | |
384 | required = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), | |
385 | BDRV_SECTOR_SIZE); | |
386 | } | |
387 | ||
5d72c68b | 388 | info = g_new0(BlockMeasureInfo, 1); |
a843a22a SH |
389 | info->required = required; |
390 | ||
391 | /* Unallocated sectors count towards the file size in raw images */ | |
392 | info->fully_allocated = info->required; | |
393 | return info; | |
394 | } | |
395 | ||
a00e70c0 | 396 | static int coroutine_fn GRAPH_RDLOCK |
3d47eb0a | 397 | raw_co_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
e1c66c6d | 398 | { |
3d47eb0a | 399 | return bdrv_co_get_info(bs->file->bs, bdi); |
e1c66c6d LE |
400 | } |
401 | ||
79a55866 | 402 | static void GRAPH_RDLOCK raw_refresh_limits(BlockDriverState *bs, Error **errp) |
decaeed7 | 403 | { |
8c6f27e7 PB |
404 | bs->bl.has_variable_length = bs->file->bs->bl.has_variable_length; |
405 | ||
decaeed7 EB |
406 | if (bs->probed) { |
407 | /* To make it easier to protect the first sector, any probed | |
408 | * image is restricted to read-modify-write on sub-sector | |
409 | * operations. */ | |
410 | bs->bl.request_alignment = BDRV_SECTOR_SIZE; | |
411 | } | |
412 | } | |
413 | ||
c2b8e315 KW |
414 | static int coroutine_fn GRAPH_RDLOCK |
415 | raw_co_truncate(BlockDriverState *bs, int64_t offset, bool exact, | |
416 | PreallocMode prealloc, BdrvRequestFlags flags, Error **errp) | |
e1c66c6d | 417 | { |
2fdc7045 TG |
418 | BDRVRawState *s = bs->opaque; |
419 | ||
420 | if (s->has_size) { | |
f59adb32 | 421 | error_setg(errp, "Cannot resize fixed-size raw disks"); |
2fdc7045 TG |
422 | return -ENOTSUP; |
423 | } | |
424 | ||
425 | if (INT64_MAX - offset < s->offset) { | |
f59adb32 | 426 | error_setg(errp, "Disk size too large for the chosen offset"); |
2fdc7045 TG |
427 | return -EINVAL; |
428 | } | |
429 | ||
430 | s->size = offset; | |
431 | offset += s->offset; | |
1ddaabae | 432 | return bdrv_co_truncate(bs->file, offset, exact, prealloc, flags, errp); |
e1c66c6d LE |
433 | } |
434 | ||
79a292e5 KW |
435 | static void coroutine_fn GRAPH_RDLOCK |
436 | raw_co_eject(BlockDriverState *bs, bool eject_flag) | |
e1c66c6d | 437 | { |
2531b390 | 438 | bdrv_co_eject(bs->file->bs, eject_flag); |
e1c66c6d LE |
439 | } |
440 | ||
79a292e5 KW |
441 | static void coroutine_fn GRAPH_RDLOCK |
442 | raw_co_lock_medium(BlockDriverState *bs, bool locked) | |
e1c66c6d | 443 | { |
2c75261c | 444 | bdrv_co_lock_medium(bs->file->bs, locked); |
e1c66c6d LE |
445 | } |
446 | ||
26c518ab KW |
447 | static int coroutine_fn GRAPH_RDLOCK |
448 | raw_co_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) | |
e1c66c6d | 449 | { |
2fdc7045 TG |
450 | BDRVRawState *s = bs->opaque; |
451 | if (s->offset || s->has_size) { | |
452 | return -ENOTSUP; | |
453 | } | |
151a2930 | 454 | return bdrv_co_ioctl(bs->file->bs, req, buf); |
e1c66c6d LE |
455 | } |
456 | ||
06717986 | 457 | static int GRAPH_RDLOCK raw_has_zero_init(BlockDriverState *bs) |
e1c66c6d | 458 | { |
9a4f4c31 | 459 | return bdrv_has_zero_init(bs->file->bs); |
e1c66c6d LE |
460 | } |
461 | ||
4db7ba3b | 462 | static int coroutine_fn GRAPH_UNLOCKED |
4ec8df01 KW |
463 | raw_co_create_opts(BlockDriver *drv, const char *filename, |
464 | QemuOpts *opts, Error **errp) | |
1565262c | 465 | { |
2475a0d0 | 466 | return bdrv_co_create_file(filename, opts, errp); |
1565262c | 467 | } |
01dd96d8 | 468 | |
015a1036 HR |
469 | static int raw_open(BlockDriverState *bs, QDict *options, int flags, |
470 | Error **errp) | |
01dd96d8 | 471 | { |
2fdc7045 | 472 | BDRVRawState *s = bs->opaque; |
500e2434 HR |
473 | bool has_size; |
474 | uint64_t offset, size; | |
58944401 | 475 | BdrvChildRole file_role; |
2fdc7045 TG |
476 | int ret; |
477 | ||
a4b740db KW |
478 | GLOBAL_STATE_CODE(); |
479 | ||
500e2434 HR |
480 | ret = raw_read_options(options, &offset, &has_size, &size, errp); |
481 | if (ret < 0) { | |
482 | return ret; | |
483 | } | |
484 | ||
58944401 HR |
485 | /* |
486 | * Without offset and a size limit, this driver behaves very much | |
487 | * like a filter. With any such limit, it does not. | |
488 | */ | |
489 | if (offset || has_size) { | |
490 | file_role = BDRV_CHILD_DATA | BDRV_CHILD_PRIMARY; | |
491 | } else { | |
492 | file_role = BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY; | |
493 | } | |
494 | ||
5bb04747 VSO |
495 | bdrv_open_child(NULL, options, "file", bs, &child_of_bds, |
496 | file_role, false, errp); | |
a4b740db KW |
497 | |
498 | GRAPH_RDLOCK_GUARD_MAINLOOP(); | |
4e4bf5c4 KW |
499 | if (!bs->file) { |
500 | return -EINVAL; | |
501 | } | |
502 | ||
006e1962 | 503 | bs->sg = bdrv_is_sg(bs->file->bs); |
228345bf HR |
504 | bs->supported_write_flags = BDRV_REQ_WRITE_UNCHANGED | |
505 | (BDRV_REQ_FUA & bs->file->bs->supported_write_flags); | |
506 | bs->supported_zero_flags = BDRV_REQ_WRITE_UNCHANGED | | |
80f5c33f | 507 | ((BDRV_REQ_FUA | BDRV_REQ_MAY_UNMAP | BDRV_REQ_NO_FALLBACK) & |
228345bf | 508 | bs->file->bs->supported_zero_flags); |
1ddaabae KW |
509 | bs->supported_truncate_flags = bs->file->bs->supported_truncate_flags & |
510 | BDRV_REQ_ZERO_WRITE; | |
38f3ef57 KW |
511 | |
512 | if (bs->probed && !bdrv_is_read_only(bs)) { | |
f30c66ba | 513 | bdrv_refresh_filename(bs->file->bs); |
38f3ef57 KW |
514 | fprintf(stderr, |
515 | "WARNING: Image format was not specified for '%s' and probing " | |
516 | "guessed raw.\n" | |
517 | " Automatically detecting the format is dangerous for " | |
518 | "raw images, write operations on block 0 will be restricted.\n" | |
519 | " Specify the 'raw' format explicitly to remove the " | |
520 | "restrictions.\n", | |
9a4f4c31 | 521 | bs->file->bs->filename); |
38f3ef57 KW |
522 | } |
523 | ||
500e2434 | 524 | ret = raw_apply_options(bs, s, offset, has_size, size, errp); |
2fdc7045 TG |
525 | if (ret < 0) { |
526 | return ret; | |
527 | } | |
528 | ||
006e1962 | 529 | if (bdrv_is_sg(bs) && (s->offset || s->has_size)) { |
2fdc7045 TG |
530 | error_setg(errp, "Cannot use offset/size with SCSI generic devices"); |
531 | return -EINVAL; | |
532 | } | |
533 | ||
01dd96d8 LE |
534 | return 0; |
535 | } | |
536 | ||
7a6d3fc5 | 537 | static int raw_probe(const uint8_t *buf, int buf_size, const char *filename) |
01dd96d8 LE |
538 | { |
539 | /* smallest possible positive score so that raw is used if and only if no | |
540 | * other block driver works | |
541 | */ | |
542 | return 1; | |
543 | } | |
775d6afd | 544 | |
221caadc KW |
545 | static int GRAPH_RDLOCK |
546 | raw_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz) | |
1a9335e4 | 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 | ||
79a55866 KW |
563 | static int GRAPH_RDLOCK |
564 | raw_probe_geometry(BlockDriverState *bs, HDGeometry *geo) | |
1a9335e4 | 565 | { |
2fdc7045 TG |
566 | BDRVRawState *s = bs->opaque; |
567 | if (s->offset || s->has_size) { | |
568 | return -ENOTSUP; | |
569 | } | |
9a4f4c31 | 570 | return bdrv_probe_geometry(bs->file->bs, geo); |
1a9335e4 ET |
571 | } |
572 | ||
742bf09b EGE |
573 | static int coroutine_fn GRAPH_RDLOCK |
574 | raw_co_copy_range_from(BlockDriverState *bs, | |
575 | BdrvChild *src, int64_t src_offset, | |
576 | BdrvChild *dst, int64_t dst_offset, | |
577 | int64_t bytes, BdrvRequestFlags read_flags, | |
578 | BdrvRequestFlags write_flags) | |
72d219e2 FZ |
579 | { |
580 | int ret; | |
581 | ||
48535049 | 582 | ret = raw_adjust_offset(bs, &src_offset, bytes, false); |
72d219e2 FZ |
583 | if (ret) { |
584 | return ret; | |
585 | } | |
586 | return bdrv_co_copy_range_from(bs->file, src_offset, dst, dst_offset, | |
67b51fb9 | 587 | bytes, read_flags, write_flags); |
72d219e2 FZ |
588 | } |
589 | ||
742bf09b EGE |
590 | static int coroutine_fn GRAPH_RDLOCK |
591 | raw_co_copy_range_to(BlockDriverState *bs, | |
592 | BdrvChild *src, int64_t src_offset, | |
593 | BdrvChild *dst, int64_t dst_offset, | |
594 | int64_t bytes, BdrvRequestFlags read_flags, | |
595 | BdrvRequestFlags write_flags) | |
72d219e2 FZ |
596 | { |
597 | int ret; | |
598 | ||
48535049 | 599 | ret = raw_adjust_offset(bs, &dst_offset, bytes, true); |
72d219e2 FZ |
600 | if (ret) { |
601 | return ret; | |
602 | } | |
603 | return bdrv_co_copy_range_to(src, src_offset, bs->file, dst_offset, bytes, | |
67b51fb9 | 604 | read_flags, write_flags); |
72d219e2 FZ |
605 | } |
606 | ||
2654267c HR |
607 | static const char *const raw_strong_runtime_opts[] = { |
608 | "offset", | |
609 | "size", | |
610 | ||
611 | NULL | |
612 | }; | |
613 | ||
79a55866 | 614 | static void GRAPH_RDLOCK raw_cancel_in_flight(BlockDriverState *bs) |
3fc1ec37 VSO |
615 | { |
616 | bdrv_cancel_in_flight(bs->file->bs); | |
617 | } | |
618 | ||
b68ce824 SH |
619 | static void raw_child_perm(BlockDriverState *bs, BdrvChild *c, |
620 | BdrvChildRole role, | |
621 | BlockReopenQueue *reopen_queue, | |
622 | uint64_t parent_perm, uint64_t parent_shared, | |
623 | uint64_t *nperm, uint64_t *nshared) | |
624 | { | |
625 | bdrv_default_perms(bs, c, role, reopen_queue, parent_perm, | |
626 | parent_shared, nperm, nshared); | |
627 | ||
628 | /* | |
629 | * bdrv_default_perms() may add WRITE and/or RESIZE (see comment in | |
630 | * bdrv_default_perms_for_storage() for an explanation) but we only need | |
631 | * them if they are in parent_perm. Drop WRITE and RESIZE whenever possible | |
632 | * to avoid permission conflicts. | |
633 | */ | |
634 | *nperm &= ~(BLK_PERM_WRITE | BLK_PERM_RESIZE); | |
635 | *nperm |= parent_perm & (BLK_PERM_WRITE | BLK_PERM_RESIZE); | |
636 | } | |
637 | ||
5f535a94 | 638 | BlockDriver bdrv_raw = { |
775d6afd | 639 | .format_name = "raw", |
2fdc7045 | 640 | .instance_size = sizeof(BDRVRawState), |
774c726c | 641 | .supports_zoned_children = true, |
775d6afd LE |
642 | .bdrv_probe = &raw_probe, |
643 | .bdrv_reopen_prepare = &raw_reopen_prepare, | |
2fdc7045 TG |
644 | .bdrv_reopen_commit = &raw_reopen_commit, |
645 | .bdrv_reopen_abort = &raw_reopen_abort, | |
775d6afd | 646 | .bdrv_open = &raw_open, |
b68ce824 | 647 | .bdrv_child_perm = raw_child_perm, |
efc75e2a | 648 | .bdrv_co_create_opts = &raw_co_create_opts, |
decaeed7 EB |
649 | .bdrv_co_preadv = &raw_co_preadv, |
650 | .bdrv_co_pwritev = &raw_co_pwritev, | |
39ad937e | 651 | .bdrv_co_pwrite_zeroes = &raw_co_pwrite_zeroes, |
5f61ad07 | 652 | .bdrv_co_pdiscard = &raw_co_pdiscard, |
50c4bcd4 SL |
653 | .bdrv_co_zone_report = &raw_co_zone_report, |
654 | .bdrv_co_zone_mgmt = &raw_co_zone_mgmt, | |
4751d09a | 655 | .bdrv_co_zone_append = &raw_co_zone_append, |
d41aa7e3 | 656 | .bdrv_co_block_status = &raw_co_block_status, |
72d219e2 FZ |
657 | .bdrv_co_copy_range_from = &raw_co_copy_range_from, |
658 | .bdrv_co_copy_range_to = &raw_co_copy_range_to, | |
061ca8a3 | 659 | .bdrv_co_truncate = &raw_co_truncate, |
c86422c5 | 660 | .bdrv_co_getlength = &raw_co_getlength, |
d67066d8 | 661 | .is_format = true, |
a843a22a | 662 | .bdrv_measure = &raw_measure, |
3d47eb0a | 663 | .bdrv_co_get_info = &raw_co_get_info, |
decaeed7 | 664 | .bdrv_refresh_limits = &raw_refresh_limits, |
1a9335e4 ET |
665 | .bdrv_probe_blocksizes = &raw_probe_blocksizes, |
666 | .bdrv_probe_geometry = &raw_probe_geometry, | |
2531b390 | 667 | .bdrv_co_eject = &raw_co_eject, |
2c75261c | 668 | .bdrv_co_lock_medium = &raw_co_lock_medium, |
151a2930 | 669 | .bdrv_co_ioctl = &raw_co_ioctl, |
cd3a4cf6 | 670 | .create_opts = &raw_create_opts, |
2654267c HR |
671 | .bdrv_has_zero_init = &raw_has_zero_init, |
672 | .strong_runtime_opts = raw_strong_runtime_opts, | |
8a2ce0bc | 673 | .mutable_opts = mutable_opts, |
3fc1ec37 | 674 | .bdrv_cancel_in_flight = raw_cancel_in_flight, |
775d6afd LE |
675 | }; |
676 | ||
677 | static void bdrv_raw_init(void) | |
678 | { | |
679 | bdrv_register(&bdrv_raw); | |
680 | } | |
681 | ||
682 | block_init(bdrv_raw_init); |