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29#include "qemu/osdep.h"
30#include "block/block_int.h"
31#include "qapi/error.h"
32#include "qemu/option.h"
33
34typedef struct BDRVRawState {
35 uint64_t offset;
36 uint64_t size;
37 bool has_size;
38} BDRVRawState;
39
40static 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 { }
55 },
56};
57
58static 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 { }
68 }
69};
70
71static 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);
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
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
111 if ((real_size - s->offset) < s->size) {
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
121
122 if (s->has_size && !QEMU_IS_ALIGNED(s->size, BDRV_SECTOR_SIZE)) {
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
131end:
132
133 qemu_opts_del(opts);
134
135 return ret;
136}
137
138static int raw_reopen_prepare(BDRVReopenState *reopen_state,
139 BlockReopenQueue *queue, Error **errp)
140{
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
153static 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
164static void raw_reopen_abort(BDRVReopenState *state)
165{
166 g_free(state->opaque);
167 state->opaque = NULL;
168}
169
170static int coroutine_fn raw_co_preadv(BlockDriverState *bs, uint64_t offset,
171 uint64_t bytes, QEMUIOVector *qiov,
172 int flags)
173{
174 BDRVRawState *s = bs->opaque;
175
176 if (offset > UINT64_MAX - s->offset) {
177 return -EINVAL;
178 }
179 offset += s->offset;
180
181 BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO);
182 return bdrv_co_preadv(bs->file, offset, bytes, qiov, flags);
183}
184
185static int coroutine_fn raw_co_pwritev(BlockDriverState *bs, uint64_t offset,
186 uint64_t bytes, QEMUIOVector *qiov,
187 int flags)
188{
189 BDRVRawState *s = bs->opaque;
190 void *buf = NULL;
191 BlockDriver *drv;
192 QEMUIOVector local_qiov;
193 int ret;
194
195 if (s->has_size && (offset > s->size || bytes > (s->size - offset))) {
196
197
198 return -ENOSPC;
199 }
200
201 if (offset > UINT64_MAX - s->offset) {
202 ret = -EINVAL;
203 goto fail;
204 }
205
206 if (bs->probed && offset < BLOCK_PROBE_BUF_SIZE && bytes) {
207
208
209
210 QEMU_BUILD_BUG_ON(BLOCK_PROBE_BUF_SIZE != 512);
211 QEMU_BUILD_BUG_ON(BDRV_SECTOR_SIZE != 512);
212 assert(offset == 0 && bytes >= BLOCK_PROBE_BUF_SIZE);
213
214 buf = qemu_try_blockalign(bs->file->bs, 512);
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
233
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
240 offset += s->offset;
241
242 BLKDBG_EVENT(bs->file, BLKDBG_WRITE_AIO);
243 ret = bdrv_co_pwritev(bs->file, offset, bytes, qiov, flags);
244
245fail:
246 if (qiov == &local_qiov) {
247 qemu_iovec_destroy(&local_qiov);
248 }
249 qemu_vfree(buf);
250 return ret;
251}
252
253static int coroutine_fn raw_co_block_status(BlockDriverState *bs,
254 bool want_zero, int64_t offset,
255 int64_t bytes, int64_t *pnum,
256 int64_t *map,
257 BlockDriverState **file)
258{
259 BDRVRawState *s = bs->opaque;
260 *pnum = bytes;
261 *file = bs->file->bs;
262 *map = offset + s->offset;
263 return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID;
264}
265
266static int coroutine_fn raw_co_pwrite_zeroes(BlockDriverState *bs,
267 int64_t offset, int bytes,
268 BdrvRequestFlags flags)
269{
270 BDRVRawState *s = bs->opaque;
271 if (offset > UINT64_MAX - s->offset) {
272 return -EINVAL;
273 }
274 offset += s->offset;
275 return bdrv_co_pwrite_zeroes(bs->file, offset, bytes, flags);
276}
277
278static int coroutine_fn raw_co_pdiscard(BlockDriverState *bs,
279 int64_t offset, int bytes)
280{
281 BDRVRawState *s = bs->opaque;
282 if (offset > UINT64_MAX - s->offset) {
283 return -EINVAL;
284 }
285 offset += s->offset;
286 return bdrv_co_pdiscard(bs->file->bs, offset, bytes);
287}
288
289static int64_t raw_getlength(BlockDriverState *bs)
290{
291 int64_t len;
292 BDRVRawState *s = bs->opaque;
293
294
295
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
306 s->size = MIN(s->size, len - s->offset);
307 } else {
308 s->size = len - s->offset;
309 }
310 }
311
312 return s->size;
313}
314
315static BlockMeasureInfo *raw_measure(QemuOpts *opts, BlockDriverState *in_bs,
316 Error **errp)
317{
318 BlockMeasureInfo *info;
319 int64_t required;
320
321 if (in_bs) {
322 required = bdrv_getlength(in_bs);
323 if (required < 0) {
324 error_setg_errno(errp, -required, "Unable to get image size");
325 return NULL;
326 }
327 } else {
328 required = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
329 BDRV_SECTOR_SIZE);
330 }
331
332 info = g_new(BlockMeasureInfo, 1);
333 info->required = required;
334
335
336 info->fully_allocated = info->required;
337 return info;
338}
339
340static int raw_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
341{
342 return bdrv_get_info(bs->file->bs, bdi);
343}
344
345static void raw_refresh_limits(BlockDriverState *bs, Error **errp)
346{
347 if (bs->probed) {
348
349
350
351 bs->bl.request_alignment = BDRV_SECTOR_SIZE;
352 }
353}
354
355static int raw_truncate(BlockDriverState *bs, int64_t offset,
356 PreallocMode prealloc, Error **errp)
357{
358 BDRVRawState *s = bs->opaque;
359
360 if (s->has_size) {
361 error_setg(errp, "Cannot resize fixed-size raw disks");
362 return -ENOTSUP;
363 }
364
365 if (INT64_MAX - offset < s->offset) {
366 error_setg(errp, "Disk size too large for the chosen offset");
367 return -EINVAL;
368 }
369
370 s->size = offset;
371 offset += s->offset;
372 return bdrv_truncate(bs->file, offset, prealloc, errp);
373}
374
375static void raw_eject(BlockDriverState *bs, bool eject_flag)
376{
377 bdrv_eject(bs->file->bs, eject_flag);
378}
379
380static void raw_lock_medium(BlockDriverState *bs, bool locked)
381{
382 bdrv_lock_medium(bs->file->bs, locked);
383}
384
385static int raw_co_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
386{
387 BDRVRawState *s = bs->opaque;
388 if (s->offset || s->has_size) {
389 return -ENOTSUP;
390 }
391 return bdrv_co_ioctl(bs->file->bs, req, buf);
392}
393
394static int raw_has_zero_init(BlockDriverState *bs)
395{
396 return bdrv_has_zero_init(bs->file->bs);
397}
398
399static int coroutine_fn raw_co_create_opts(const char *filename, QemuOpts *opts,
400 Error **errp)
401{
402 return bdrv_create_file(filename, opts, errp);
403}
404
405static int raw_open(BlockDriverState *bs, QDict *options, int flags,
406 Error **errp)
407{
408 BDRVRawState *s = bs->opaque;
409 int ret;
410
411 bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file,
412 false, errp);
413 if (!bs->file) {
414 return -EINVAL;
415 }
416
417 bs->sg = bs->file->bs->sg;
418 bs->supported_write_flags = BDRV_REQ_FUA &
419 bs->file->bs->supported_write_flags;
420 bs->supported_zero_flags = (BDRV_REQ_FUA | BDRV_REQ_MAY_UNMAP) &
421 bs->file->bs->supported_zero_flags;
422
423 if (bs->probed && !bdrv_is_read_only(bs)) {
424 fprintf(stderr,
425 "WARNING: Image format was not specified for '%s' and probing "
426 "guessed raw.\n"
427 " Automatically detecting the format is dangerous for "
428 "raw images, write operations on block 0 will be restricted.\n"
429 " Specify the 'raw' format explicitly to remove the "
430 "restrictions.\n",
431 bs->file->bs->filename);
432 }
433
434 ret = raw_read_options(options, bs, s, errp);
435 if (ret < 0) {
436 return ret;
437 }
438
439 if (bs->sg && (s->offset || s->has_size)) {
440 error_setg(errp, "Cannot use offset/size with SCSI generic devices");
441 return -EINVAL;
442 }
443
444 return 0;
445}
446
447static void raw_close(BlockDriverState *bs)
448{
449}
450
451static int raw_probe(const uint8_t *buf, int buf_size, const char *filename)
452{
453
454
455
456 return 1;
457}
458
459static int raw_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz)
460{
461 BDRVRawState *s = bs->opaque;
462 int ret;
463
464 ret = bdrv_probe_blocksizes(bs->file->bs, bsz);
465 if (ret < 0) {
466 return ret;
467 }
468
469 if (!QEMU_IS_ALIGNED(s->offset, MAX(bsz->log, bsz->phys))) {
470 return -ENOTSUP;
471 }
472
473 return 0;
474}
475
476static int raw_probe_geometry(BlockDriverState *bs, HDGeometry *geo)
477{
478 BDRVRawState *s = bs->opaque;
479 if (s->offset || s->has_size) {
480 return -ENOTSUP;
481 }
482 return bdrv_probe_geometry(bs->file->bs, geo);
483}
484
485BlockDriver bdrv_raw = {
486 .format_name = "raw",
487 .instance_size = sizeof(BDRVRawState),
488 .bdrv_probe = &raw_probe,
489 .bdrv_reopen_prepare = &raw_reopen_prepare,
490 .bdrv_reopen_commit = &raw_reopen_commit,
491 .bdrv_reopen_abort = &raw_reopen_abort,
492 .bdrv_open = &raw_open,
493 .bdrv_close = &raw_close,
494 .bdrv_child_perm = bdrv_filter_default_perms,
495 .bdrv_co_create_opts = &raw_co_create_opts,
496 .bdrv_co_preadv = &raw_co_preadv,
497 .bdrv_co_pwritev = &raw_co_pwritev,
498 .bdrv_co_pwrite_zeroes = &raw_co_pwrite_zeroes,
499 .bdrv_co_pdiscard = &raw_co_pdiscard,
500 .bdrv_co_block_status = &raw_co_block_status,
501 .bdrv_truncate = &raw_truncate,
502 .bdrv_getlength = &raw_getlength,
503 .has_variable_length = true,
504 .bdrv_measure = &raw_measure,
505 .bdrv_get_info = &raw_get_info,
506 .bdrv_refresh_limits = &raw_refresh_limits,
507 .bdrv_probe_blocksizes = &raw_probe_blocksizes,
508 .bdrv_probe_geometry = &raw_probe_geometry,
509 .bdrv_eject = &raw_eject,
510 .bdrv_lock_medium = &raw_lock_medium,
511 .bdrv_co_ioctl = &raw_co_ioctl,
512 .create_opts = &raw_create_opts,
513 .bdrv_has_zero_init = &raw_has_zero_init
514};
515
516static void bdrv_raw_init(void)
517{
518 bdrv_register(&bdrv_raw);
519}
520
521block_init(bdrv_raw_init);
522