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1 | /* BlockDriver implementation for "raw" format driver | |
2 | * | |
3 | * Copyright (C) 2010-2016 Red Hat, Inc. | |
4 | * Copyright (C) 2010, Blue Swirl <blauwirbel@gmail.com> | |
5 | * Copyright (C) 2009, Anthony Liguori <aliguori@us.ibm.com> | |
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 | ||
29 | #include "qemu/osdep.h" | |
30 | #include "block/block-io.h" | |
31 | #include "block/block_int.h" | |
32 | #include "qapi/error.h" | |
33 | #include "qemu/module.h" | |
34 | #include "qemu/option.h" | |
35 | #include "qemu/memalign.h" | |
36 | ||
37 | typedef struct BDRVRawState { | |
38 | uint64_t offset; | |
39 | uint64_t size; | |
40 | bool has_size; | |
41 | } BDRVRawState; | |
42 | ||
43 | static const char *const mutable_opts[] = { "offset", "size", NULL }; | |
44 | ||
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 | ||
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 | } | |
74 | }; | |
75 | ||
76 | static int raw_read_options(QDict *options, uint64_t *offset, bool *has_size, | |
77 | uint64_t *size, Error **errp) | |
78 | { | |
79 | QemuOpts *opts = NULL; | |
80 | int ret; | |
81 | ||
82 | opts = qemu_opts_create(&raw_runtime_opts, NULL, 0, &error_abort); | |
83 | if (!qemu_opts_absorb_qdict(opts, options, errp)) { | |
84 | ret = -EINVAL; | |
85 | goto end; | |
86 | } | |
87 | ||
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); | |
91 | ||
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; | |
108 | } | |
109 | ||
110 | /* Check size and offset */ | |
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) { | |
119 | error_setg(errp, "The sum of offset (%" PRIu64 ") and size " | |
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; | |
124 | } | |
125 | ||
126 | /* Make sure size is multiple of BDRV_SECTOR_SIZE to prevent rounding | |
127 | * up and leaking out of the specified area. */ | |
128 | if (has_size && !QEMU_IS_ALIGNED(size, BDRV_SECTOR_SIZE)) { | |
129 | error_setg(errp, "Specified size is not multiple of %llu", | |
130 | BDRV_SECTOR_SIZE); | |
131 | return -EINVAL; | |
132 | } | |
133 | ||
134 | s->offset = offset; | |
135 | s->has_size = has_size; | |
136 | s->size = has_size ? size : real_size - offset; | |
137 | ||
138 | return 0; | |
139 | } | |
140 | ||
141 | static int raw_reopen_prepare(BDRVReopenState *reopen_state, | |
142 | BlockReopenQueue *queue, Error **errp) | |
143 | { | |
144 | bool has_size; | |
145 | uint64_t offset, size; | |
146 | int ret; | |
147 | ||
148 | assert(reopen_state != NULL); | |
149 | assert(reopen_state->bs != NULL); | |
150 | ||
151 | reopen_state->opaque = g_new0(BDRVRawState, 1); | |
152 | ||
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; | |
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; | |
183 | } | |
184 | ||
185 | /* Check and adjust the offset, against 'offset' and 'size' options. */ | |
186 | static inline int raw_adjust_offset(BlockDriverState *bs, int64_t *offset, | |
187 | int64_t bytes, bool is_write) | |
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. */ | |
195 | return is_write ? -ENOSPC : -EINVAL; | |
196 | } | |
197 | ||
198 | if (*offset > INT64_MAX - s->offset) { | |
199 | return -EINVAL; | |
200 | } | |
201 | *offset += s->offset; | |
202 | ||
203 | return 0; | |
204 | } | |
205 | ||
206 | static int coroutine_fn GRAPH_RDLOCK | |
207 | raw_co_preadv(BlockDriverState *bs, int64_t offset, int64_t bytes, | |
208 | QEMUIOVector *qiov, BdrvRequestFlags flags) | |
209 | { | |
210 | int ret; | |
211 | ||
212 | ret = raw_adjust_offset(bs, &offset, bytes, false); | |
213 | if (ret) { | |
214 | return ret; | |
215 | } | |
216 | ||
217 | BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO); | |
218 | return bdrv_co_preadv(bs->file, offset, bytes, qiov, flags); | |
219 | } | |
220 | ||
221 | static int coroutine_fn GRAPH_RDLOCK | |
222 | raw_co_pwritev(BlockDriverState *bs, int64_t offset, int64_t bytes, | |
223 | QEMUIOVector *qiov, BdrvRequestFlags flags) | |
224 | { | |
225 | void *buf = NULL; | |
226 | BlockDriver *drv; | |
227 | QEMUIOVector local_qiov; | |
228 | int ret; | |
229 | ||
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 */ | |
234 | QEMU_BUILD_BUG_ON(BLOCK_PROBE_BUF_SIZE != 512); | |
235 | QEMU_BUILD_BUG_ON(BDRV_SECTOR_SIZE != 512); | |
236 | assert(offset == 0 && bytes >= BLOCK_PROBE_BUF_SIZE); | |
237 | ||
238 | buf = qemu_try_blockalign(bs->file->bs, 512); | |
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; | |
262 | ||
263 | flags &= ~BDRV_REQ_REGISTERED_BUF; | |
264 | } | |
265 | ||
266 | ret = raw_adjust_offset(bs, &offset, bytes, true); | |
267 | if (ret) { | |
268 | goto fail; | |
269 | } | |
270 | ||
271 | BLKDBG_EVENT(bs->file, BLKDBG_WRITE_AIO); | |
272 | ret = bdrv_co_pwritev(bs->file, offset, bytes, qiov, flags); | |
273 | ||
274 | fail: | |
275 | if (qiov == &local_qiov) { | |
276 | qemu_iovec_destroy(&local_qiov); | |
277 | } | |
278 | qemu_vfree(buf); | |
279 | return ret; | |
280 | } | |
281 | ||
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, | |
286 | BlockDriverState **file) | |
287 | { | |
288 | BDRVRawState *s = bs->opaque; | |
289 | *pnum = bytes; | |
290 | *file = bs->file->bs; | |
291 | *map = offset + s->offset; | |
292 | return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID; | |
293 | } | |
294 | ||
295 | static int coroutine_fn GRAPH_RDLOCK | |
296 | raw_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset, int64_t bytes, | |
297 | BdrvRequestFlags flags) | |
298 | { | |
299 | int ret; | |
300 | ||
301 | ret = raw_adjust_offset(bs, &offset, bytes, true); | |
302 | if (ret) { | |
303 | return ret; | |
304 | } | |
305 | return bdrv_co_pwrite_zeroes(bs->file, offset, bytes, flags); | |
306 | } | |
307 | ||
308 | static int coroutine_fn GRAPH_RDLOCK | |
309 | raw_co_pdiscard(BlockDriverState *bs, int64_t offset, int64_t bytes) | |
310 | { | |
311 | int ret; | |
312 | ||
313 | ret = raw_adjust_offset(bs, &offset, bytes, true); | |
314 | if (ret) { | |
315 | return ret; | |
316 | } | |
317 | return bdrv_co_pdiscard(bs->file, offset, bytes); | |
318 | } | |
319 | ||
320 | static int64_t coroutine_fn GRAPH_RDLOCK | |
321 | raw_co_getlength(BlockDriverState *bs) | |
322 | { | |
323 | int64_t len; | |
324 | BDRVRawState *s = bs->opaque; | |
325 | ||
326 | /* Update size. It should not change unless the file was externally | |
327 | * modified. */ | |
328 | len = bdrv_co_getlength(bs->file->bs); | |
329 | if (len < 0) { | |
330 | return len; | |
331 | } | |
332 | ||
333 | if (len < s->offset) { | |
334 | s->size = 0; | |
335 | } else { | |
336 | if (s->has_size) { | |
337 | /* Try to honour the size */ | |
338 | s->size = MIN(s->size, len - s->offset); | |
339 | } else { | |
340 | s->size = len - s->offset; | |
341 | } | |
342 | } | |
343 | ||
344 | return s->size; | |
345 | } | |
346 | ||
347 | static BlockMeasureInfo *raw_measure(QemuOpts *opts, BlockDriverState *in_bs, | |
348 | Error **errp) | |
349 | { | |
350 | BlockMeasureInfo *info; | |
351 | int64_t required; | |
352 | ||
353 | if (in_bs) { | |
354 | required = bdrv_getlength(in_bs); | |
355 | if (required < 0) { | |
356 | error_setg_errno(errp, -required, "Unable to get image size"); | |
357 | return NULL; | |
358 | } | |
359 | } else { | |
360 | required = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), | |
361 | BDRV_SECTOR_SIZE); | |
362 | } | |
363 | ||
364 | info = g_new0(BlockMeasureInfo, 1); | |
365 | info->required = required; | |
366 | ||
367 | /* Unallocated sectors count towards the file size in raw images */ | |
368 | info->fully_allocated = info->required; | |
369 | return info; | |
370 | } | |
371 | ||
372 | static int coroutine_fn GRAPH_RDLOCK | |
373 | raw_co_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) | |
374 | { | |
375 | return bdrv_co_get_info(bs->file->bs, bdi); | |
376 | } | |
377 | ||
378 | static void raw_refresh_limits(BlockDriverState *bs, Error **errp) | |
379 | { | |
380 | bs->bl.has_variable_length = bs->file->bs->bl.has_variable_length; | |
381 | ||
382 | if (bs->probed) { | |
383 | /* To make it easier to protect the first sector, any probed | |
384 | * image is restricted to read-modify-write on sub-sector | |
385 | * operations. */ | |
386 | bs->bl.request_alignment = BDRV_SECTOR_SIZE; | |
387 | } | |
388 | } | |
389 | ||
390 | static int coroutine_fn GRAPH_RDLOCK | |
391 | raw_co_truncate(BlockDriverState *bs, int64_t offset, bool exact, | |
392 | PreallocMode prealloc, BdrvRequestFlags flags, Error **errp) | |
393 | { | |
394 | BDRVRawState *s = bs->opaque; | |
395 | ||
396 | if (s->has_size) { | |
397 | error_setg(errp, "Cannot resize fixed-size raw disks"); | |
398 | return -ENOTSUP; | |
399 | } | |
400 | ||
401 | if (INT64_MAX - offset < s->offset) { | |
402 | error_setg(errp, "Disk size too large for the chosen offset"); | |
403 | return -EINVAL; | |
404 | } | |
405 | ||
406 | s->size = offset; | |
407 | offset += s->offset; | |
408 | return bdrv_co_truncate(bs->file, offset, exact, prealloc, flags, errp); | |
409 | } | |
410 | ||
411 | static void coroutine_fn GRAPH_RDLOCK | |
412 | raw_co_eject(BlockDriverState *bs, bool eject_flag) | |
413 | { | |
414 | bdrv_co_eject(bs->file->bs, eject_flag); | |
415 | } | |
416 | ||
417 | static void coroutine_fn GRAPH_RDLOCK | |
418 | raw_co_lock_medium(BlockDriverState *bs, bool locked) | |
419 | { | |
420 | bdrv_co_lock_medium(bs->file->bs, locked); | |
421 | } | |
422 | ||
423 | static int coroutine_fn GRAPH_RDLOCK | |
424 | raw_co_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) | |
425 | { | |
426 | BDRVRawState *s = bs->opaque; | |
427 | if (s->offset || s->has_size) { | |
428 | return -ENOTSUP; | |
429 | } | |
430 | return bdrv_co_ioctl(bs->file->bs, req, buf); | |
431 | } | |
432 | ||
433 | static int raw_has_zero_init(BlockDriverState *bs) | |
434 | { | |
435 | return bdrv_has_zero_init(bs->file->bs); | |
436 | } | |
437 | ||
438 | static int coroutine_fn GRAPH_RDLOCK | |
439 | raw_co_create_opts(BlockDriver *drv, const char *filename, | |
440 | QemuOpts *opts, Error **errp) | |
441 | { | |
442 | return bdrv_co_create_file(filename, opts, errp); | |
443 | } | |
444 | ||
445 | static int raw_open(BlockDriverState *bs, QDict *options, int flags, | |
446 | Error **errp) | |
447 | { | |
448 | BDRVRawState *s = bs->opaque; | |
449 | bool has_size; | |
450 | uint64_t offset, size; | |
451 | BdrvChildRole file_role; | |
452 | int ret; | |
453 | ||
454 | ret = raw_read_options(options, &offset, &has_size, &size, errp); | |
455 | if (ret < 0) { | |
456 | return ret; | |
457 | } | |
458 | ||
459 | /* | |
460 | * Without offset and a size limit, this driver behaves very much | |
461 | * like a filter. With any such limit, it does not. | |
462 | */ | |
463 | if (offset || has_size) { | |
464 | file_role = BDRV_CHILD_DATA | BDRV_CHILD_PRIMARY; | |
465 | } else { | |
466 | file_role = BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY; | |
467 | } | |
468 | ||
469 | bdrv_open_child(NULL, options, "file", bs, &child_of_bds, | |
470 | file_role, false, errp); | |
471 | if (!bs->file) { | |
472 | return -EINVAL; | |
473 | } | |
474 | ||
475 | bs->sg = bdrv_is_sg(bs->file->bs); | |
476 | bs->supported_write_flags = BDRV_REQ_WRITE_UNCHANGED | | |
477 | (BDRV_REQ_FUA & bs->file->bs->supported_write_flags); | |
478 | bs->supported_zero_flags = BDRV_REQ_WRITE_UNCHANGED | | |
479 | ((BDRV_REQ_FUA | BDRV_REQ_MAY_UNMAP | BDRV_REQ_NO_FALLBACK) & | |
480 | bs->file->bs->supported_zero_flags); | |
481 | bs->supported_truncate_flags = bs->file->bs->supported_truncate_flags & | |
482 | BDRV_REQ_ZERO_WRITE; | |
483 | ||
484 | if (bs->probed && !bdrv_is_read_only(bs)) { | |
485 | bdrv_refresh_filename(bs->file->bs); | |
486 | fprintf(stderr, | |
487 | "WARNING: Image format was not specified for '%s' and probing " | |
488 | "guessed raw.\n" | |
489 | " Automatically detecting the format is dangerous for " | |
490 | "raw images, write operations on block 0 will be restricted.\n" | |
491 | " Specify the 'raw' format explicitly to remove the " | |
492 | "restrictions.\n", | |
493 | bs->file->bs->filename); | |
494 | } | |
495 | ||
496 | ret = raw_apply_options(bs, s, offset, has_size, size, errp); | |
497 | if (ret < 0) { | |
498 | return ret; | |
499 | } | |
500 | ||
501 | if (bdrv_is_sg(bs) && (s->offset || s->has_size)) { | |
502 | error_setg(errp, "Cannot use offset/size with SCSI generic devices"); | |
503 | return -EINVAL; | |
504 | } | |
505 | ||
506 | return 0; | |
507 | } | |
508 | ||
509 | static int raw_probe(const uint8_t *buf, int buf_size, const char *filename) | |
510 | { | |
511 | /* smallest possible positive score so that raw is used if and only if no | |
512 | * other block driver works | |
513 | */ | |
514 | return 1; | |
515 | } | |
516 | ||
517 | static int raw_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz) | |
518 | { | |
519 | BDRVRawState *s = bs->opaque; | |
520 | int ret; | |
521 | ||
522 | ret = bdrv_probe_blocksizes(bs->file->bs, bsz); | |
523 | if (ret < 0) { | |
524 | return ret; | |
525 | } | |
526 | ||
527 | if (!QEMU_IS_ALIGNED(s->offset, MAX(bsz->log, bsz->phys))) { | |
528 | return -ENOTSUP; | |
529 | } | |
530 | ||
531 | return 0; | |
532 | } | |
533 | ||
534 | static int raw_probe_geometry(BlockDriverState *bs, HDGeometry *geo) | |
535 | { | |
536 | BDRVRawState *s = bs->opaque; | |
537 | if (s->offset || s->has_size) { | |
538 | return -ENOTSUP; | |
539 | } | |
540 | return bdrv_probe_geometry(bs->file->bs, geo); | |
541 | } | |
542 | ||
543 | static int coroutine_fn GRAPH_RDLOCK | |
544 | raw_co_copy_range_from(BlockDriverState *bs, | |
545 | BdrvChild *src, int64_t src_offset, | |
546 | BdrvChild *dst, int64_t dst_offset, | |
547 | int64_t bytes, BdrvRequestFlags read_flags, | |
548 | BdrvRequestFlags write_flags) | |
549 | { | |
550 | int ret; | |
551 | ||
552 | ret = raw_adjust_offset(bs, &src_offset, bytes, false); | |
553 | if (ret) { | |
554 | return ret; | |
555 | } | |
556 | return bdrv_co_copy_range_from(bs->file, src_offset, dst, dst_offset, | |
557 | bytes, read_flags, write_flags); | |
558 | } | |
559 | ||
560 | static int coroutine_fn GRAPH_RDLOCK | |
561 | raw_co_copy_range_to(BlockDriverState *bs, | |
562 | BdrvChild *src, int64_t src_offset, | |
563 | BdrvChild *dst, int64_t dst_offset, | |
564 | int64_t bytes, BdrvRequestFlags read_flags, | |
565 | BdrvRequestFlags write_flags) | |
566 | { | |
567 | int ret; | |
568 | ||
569 | ret = raw_adjust_offset(bs, &dst_offset, bytes, true); | |
570 | if (ret) { | |
571 | return ret; | |
572 | } | |
573 | return bdrv_co_copy_range_to(src, src_offset, bs->file, dst_offset, bytes, | |
574 | read_flags, write_flags); | |
575 | } | |
576 | ||
577 | static const char *const raw_strong_runtime_opts[] = { | |
578 | "offset", | |
579 | "size", | |
580 | ||
581 | NULL | |
582 | }; | |
583 | ||
584 | static void raw_cancel_in_flight(BlockDriverState *bs) | |
585 | { | |
586 | bdrv_cancel_in_flight(bs->file->bs); | |
587 | } | |
588 | ||
589 | static void raw_child_perm(BlockDriverState *bs, BdrvChild *c, | |
590 | BdrvChildRole role, | |
591 | BlockReopenQueue *reopen_queue, | |
592 | uint64_t parent_perm, uint64_t parent_shared, | |
593 | uint64_t *nperm, uint64_t *nshared) | |
594 | { | |
595 | bdrv_default_perms(bs, c, role, reopen_queue, parent_perm, | |
596 | parent_shared, nperm, nshared); | |
597 | ||
598 | /* | |
599 | * bdrv_default_perms() may add WRITE and/or RESIZE (see comment in | |
600 | * bdrv_default_perms_for_storage() for an explanation) but we only need | |
601 | * them if they are in parent_perm. Drop WRITE and RESIZE whenever possible | |
602 | * to avoid permission conflicts. | |
603 | */ | |
604 | *nperm &= ~(BLK_PERM_WRITE | BLK_PERM_RESIZE); | |
605 | *nperm |= parent_perm & (BLK_PERM_WRITE | BLK_PERM_RESIZE); | |
606 | } | |
607 | ||
608 | BlockDriver bdrv_raw = { | |
609 | .format_name = "raw", | |
610 | .instance_size = sizeof(BDRVRawState), | |
611 | .bdrv_probe = &raw_probe, | |
612 | .bdrv_reopen_prepare = &raw_reopen_prepare, | |
613 | .bdrv_reopen_commit = &raw_reopen_commit, | |
614 | .bdrv_reopen_abort = &raw_reopen_abort, | |
615 | .bdrv_open = &raw_open, | |
616 | .bdrv_child_perm = raw_child_perm, | |
617 | .bdrv_co_create_opts = &raw_co_create_opts, | |
618 | .bdrv_co_preadv = &raw_co_preadv, | |
619 | .bdrv_co_pwritev = &raw_co_pwritev, | |
620 | .bdrv_co_pwrite_zeroes = &raw_co_pwrite_zeroes, | |
621 | .bdrv_co_pdiscard = &raw_co_pdiscard, | |
622 | .bdrv_co_block_status = &raw_co_block_status, | |
623 | .bdrv_co_copy_range_from = &raw_co_copy_range_from, | |
624 | .bdrv_co_copy_range_to = &raw_co_copy_range_to, | |
625 | .bdrv_co_truncate = &raw_co_truncate, | |
626 | .bdrv_co_getlength = &raw_co_getlength, | |
627 | .is_format = true, | |
628 | .bdrv_measure = &raw_measure, | |
629 | .bdrv_co_get_info = &raw_co_get_info, | |
630 | .bdrv_refresh_limits = &raw_refresh_limits, | |
631 | .bdrv_probe_blocksizes = &raw_probe_blocksizes, | |
632 | .bdrv_probe_geometry = &raw_probe_geometry, | |
633 | .bdrv_co_eject = &raw_co_eject, | |
634 | .bdrv_co_lock_medium = &raw_co_lock_medium, | |
635 | .bdrv_co_ioctl = &raw_co_ioctl, | |
636 | .create_opts = &raw_create_opts, | |
637 | .bdrv_has_zero_init = &raw_has_zero_init, | |
638 | .strong_runtime_opts = raw_strong_runtime_opts, | |
639 | .mutable_opts = mutable_opts, | |
640 | .bdrv_cancel_in_flight = raw_cancel_in_flight, | |
641 | }; | |
642 | ||
643 | static void bdrv_raw_init(void) | |
644 | { | |
645 | bdrv_register(&bdrv_raw); | |
646 | } | |
647 | ||
648 | block_init(bdrv_raw_init); |