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Commit | Line | Data |
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585f8587 FB |
1 | /* |
2 | * Block driver for the QCOW version 2 format | |
5fafdf24 | 3 | * |
585f8587 | 4 | * Copyright (c) 2004-2006 Fabrice Bellard |
5fafdf24 | 5 | * |
585f8587 FB |
6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
7 | * of this software and associated documentation files (the "Software"), to deal | |
8 | * in the Software without restriction, including without limitation the rights | |
9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
10 | * copies of the Software, and to permit persons to whom the Software is | |
11 | * furnished to do so, subject to the following conditions: | |
12 | * | |
13 | * The above copyright notice and this permission notice shall be included in | |
14 | * all copies or substantial portions of the Software. | |
15 | * | |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
22 | * THE SOFTWARE. | |
23 | */ | |
e688df6b | 24 | |
80c71a24 | 25 | #include "qemu/osdep.h" |
737e150e | 26 | #include "block/block_int.h" |
609f45ea | 27 | #include "block/qdict.h" |
23588797 | 28 | #include "sysemu/block-backend.h" |
1de7afc9 | 29 | #include "qemu/module.h" |
585f8587 | 30 | #include <zlib.h> |
0d8c41da | 31 | #include "qcow2.h" |
1de7afc9 | 32 | #include "qemu/error-report.h" |
e688df6b | 33 | #include "qapi/error.h" |
9af23989 | 34 | #include "qapi/qapi-events-block-core.h" |
6b673957 MA |
35 | #include "qapi/qmp/qdict.h" |
36 | #include "qapi/qmp/qstring.h" | |
3cce16f4 | 37 | #include "trace.h" |
1bd0e2d1 | 38 | #include "qemu/option_int.h" |
f348b6d1 | 39 | #include "qemu/cutils.h" |
58369e22 | 40 | #include "qemu/bswap.h" |
b76b4f60 KW |
41 | #include "qapi/qobject-input-visitor.h" |
42 | #include "qapi/qapi-visit-block-core.h" | |
0d8c41da | 43 | #include "crypto.h" |
585f8587 FB |
44 | |
45 | /* | |
46 | Differences with QCOW: | |
47 | ||
48 | - Support for multiple incremental snapshots. | |
49 | - Memory management by reference counts. | |
50 | - Clusters which have a reference count of one have the bit | |
51 | QCOW_OFLAG_COPIED to optimize write performance. | |
5fafdf24 | 52 | - Size of compressed clusters is stored in sectors to reduce bit usage |
585f8587 FB |
53 | in the cluster offsets. |
54 | - Support for storing additional data (such as the VM state) in the | |
3b46e624 | 55 | snapshots. |
585f8587 FB |
56 | - If a backing store is used, the cluster size is not constrained |
57 | (could be backported to QCOW). | |
58 | - L2 tables have always a size of one cluster. | |
59 | */ | |
60 | ||
9b80ddf3 AL |
61 | |
62 | typedef struct { | |
63 | uint32_t magic; | |
64 | uint32_t len; | |
c4217f64 | 65 | } QEMU_PACKED QCowExtension; |
21d82ac9 | 66 | |
7c80ab3f JS |
67 | #define QCOW2_EXT_MAGIC_END 0 |
68 | #define QCOW2_EXT_MAGIC_BACKING_FORMAT 0xE2792ACA | |
cfcc4c62 | 69 | #define QCOW2_EXT_MAGIC_FEATURE_TABLE 0x6803f857 |
4652b8f3 | 70 | #define QCOW2_EXT_MAGIC_CRYPTO_HEADER 0x0537be77 |
88ddffae | 71 | #define QCOW2_EXT_MAGIC_BITMAPS 0x23852875 |
9b80ddf3 | 72 | |
7c80ab3f | 73 | static int qcow2_probe(const uint8_t *buf, int buf_size, const char *filename) |
585f8587 FB |
74 | { |
75 | const QCowHeader *cow_header = (const void *)buf; | |
3b46e624 | 76 | |
585f8587 FB |
77 | if (buf_size >= sizeof(QCowHeader) && |
78 | be32_to_cpu(cow_header->magic) == QCOW_MAGIC && | |
6744cbab | 79 | be32_to_cpu(cow_header->version) >= 2) |
585f8587 FB |
80 | return 100; |
81 | else | |
82 | return 0; | |
83 | } | |
84 | ||
9b80ddf3 | 85 | |
4652b8f3 DB |
86 | static ssize_t qcow2_crypto_hdr_read_func(QCryptoBlock *block, size_t offset, |
87 | uint8_t *buf, size_t buflen, | |
88 | void *opaque, Error **errp) | |
89 | { | |
90 | BlockDriverState *bs = opaque; | |
91 | BDRVQcow2State *s = bs->opaque; | |
92 | ssize_t ret; | |
93 | ||
94 | if ((offset + buflen) > s->crypto_header.length) { | |
95 | error_setg(errp, "Request for data outside of extension header"); | |
96 | return -1; | |
97 | } | |
98 | ||
99 | ret = bdrv_pread(bs->file, | |
100 | s->crypto_header.offset + offset, buf, buflen); | |
101 | if (ret < 0) { | |
102 | error_setg_errno(errp, -ret, "Could not read encryption header"); | |
103 | return -1; | |
104 | } | |
105 | return ret; | |
106 | } | |
107 | ||
108 | ||
109 | static ssize_t qcow2_crypto_hdr_init_func(QCryptoBlock *block, size_t headerlen, | |
110 | void *opaque, Error **errp) | |
111 | { | |
112 | BlockDriverState *bs = opaque; | |
113 | BDRVQcow2State *s = bs->opaque; | |
114 | int64_t ret; | |
115 | int64_t clusterlen; | |
116 | ||
117 | ret = qcow2_alloc_clusters(bs, headerlen); | |
118 | if (ret < 0) { | |
119 | error_setg_errno(errp, -ret, | |
120 | "Cannot allocate cluster for LUKS header size %zu", | |
121 | headerlen); | |
122 | return -1; | |
123 | } | |
124 | ||
125 | s->crypto_header.length = headerlen; | |
126 | s->crypto_header.offset = ret; | |
127 | ||
128 | /* Zero fill remaining space in cluster so it has predictable | |
129 | * content in case of future spec changes */ | |
130 | clusterlen = size_to_clusters(s, headerlen) * s->cluster_size; | |
c9b83e9c | 131 | assert(qcow2_pre_write_overlap_check(bs, 0, ret, clusterlen) == 0); |
4652b8f3 DB |
132 | ret = bdrv_pwrite_zeroes(bs->file, |
133 | ret + headerlen, | |
134 | clusterlen - headerlen, 0); | |
135 | if (ret < 0) { | |
136 | error_setg_errno(errp, -ret, "Could not zero fill encryption header"); | |
137 | return -1; | |
138 | } | |
139 | ||
140 | return ret; | |
141 | } | |
142 | ||
143 | ||
144 | static ssize_t qcow2_crypto_hdr_write_func(QCryptoBlock *block, size_t offset, | |
145 | const uint8_t *buf, size_t buflen, | |
146 | void *opaque, Error **errp) | |
147 | { | |
148 | BlockDriverState *bs = opaque; | |
149 | BDRVQcow2State *s = bs->opaque; | |
150 | ssize_t ret; | |
151 | ||
152 | if ((offset + buflen) > s->crypto_header.length) { | |
153 | error_setg(errp, "Request for data outside of extension header"); | |
154 | return -1; | |
155 | } | |
156 | ||
157 | ret = bdrv_pwrite(bs->file, | |
158 | s->crypto_header.offset + offset, buf, buflen); | |
159 | if (ret < 0) { | |
160 | error_setg_errno(errp, -ret, "Could not read encryption header"); | |
161 | return -1; | |
162 | } | |
163 | return ret; | |
164 | } | |
165 | ||
166 | ||
9b80ddf3 AL |
167 | /* |
168 | * read qcow2 extension and fill bs | |
169 | * start reading from start_offset | |
170 | * finish reading upon magic of value 0 or when end_offset reached | |
171 | * unknown magic is skipped (future extension this version knows nothing about) | |
172 | * return 0 upon success, non-0 otherwise | |
173 | */ | |
7c80ab3f | 174 | static int qcow2_read_extensions(BlockDriverState *bs, uint64_t start_offset, |
3ef6c40a | 175 | uint64_t end_offset, void **p_feature_table, |
88ddffae VSO |
176 | int flags, bool *need_update_header, |
177 | Error **errp) | |
9b80ddf3 | 178 | { |
ff99129a | 179 | BDRVQcow2State *s = bs->opaque; |
9b80ddf3 AL |
180 | QCowExtension ext; |
181 | uint64_t offset; | |
75bab85c | 182 | int ret; |
88ddffae VSO |
183 | Qcow2BitmapHeaderExt bitmaps_ext; |
184 | ||
185 | if (need_update_header != NULL) { | |
186 | *need_update_header = false; | |
187 | } | |
9b80ddf3 AL |
188 | |
189 | #ifdef DEBUG_EXT | |
7c80ab3f | 190 | printf("qcow2_read_extensions: start=%ld end=%ld\n", start_offset, end_offset); |
9b80ddf3 AL |
191 | #endif |
192 | offset = start_offset; | |
193 | while (offset < end_offset) { | |
194 | ||
195 | #ifdef DEBUG_EXT | |
196 | /* Sanity check */ | |
197 | if (offset > s->cluster_size) | |
7c80ab3f | 198 | printf("qcow2_read_extension: suspicious offset %lu\n", offset); |
9b80ddf3 | 199 | |
9b2260cb | 200 | printf("attempting to read extended header in offset %lu\n", offset); |
9b80ddf3 AL |
201 | #endif |
202 | ||
cf2ab8fc | 203 | ret = bdrv_pread(bs->file, offset, &ext, sizeof(ext)); |
3ef6c40a HR |
204 | if (ret < 0) { |
205 | error_setg_errno(errp, -ret, "qcow2_read_extension: ERROR: " | |
206 | "pread fail from offset %" PRIu64, offset); | |
9b80ddf3 AL |
207 | return 1; |
208 | } | |
209 | be32_to_cpus(&ext.magic); | |
210 | be32_to_cpus(&ext.len); | |
211 | offset += sizeof(ext); | |
212 | #ifdef DEBUG_EXT | |
213 | printf("ext.magic = 0x%x\n", ext.magic); | |
214 | #endif | |
2ebafc85 | 215 | if (offset > end_offset || ext.len > end_offset - offset) { |
3ef6c40a | 216 | error_setg(errp, "Header extension too large"); |
64ca6aee KW |
217 | return -EINVAL; |
218 | } | |
219 | ||
9b80ddf3 | 220 | switch (ext.magic) { |
7c80ab3f | 221 | case QCOW2_EXT_MAGIC_END: |
9b80ddf3 | 222 | return 0; |
f965509c | 223 | |
7c80ab3f | 224 | case QCOW2_EXT_MAGIC_BACKING_FORMAT: |
f965509c | 225 | if (ext.len >= sizeof(bs->backing_format)) { |
521b2b5d HR |
226 | error_setg(errp, "ERROR: ext_backing_format: len=%" PRIu32 |
227 | " too large (>=%zu)", ext.len, | |
228 | sizeof(bs->backing_format)); | |
f965509c AL |
229 | return 2; |
230 | } | |
cf2ab8fc | 231 | ret = bdrv_pread(bs->file, offset, bs->backing_format, ext.len); |
3ef6c40a HR |
232 | if (ret < 0) { |
233 | error_setg_errno(errp, -ret, "ERROR: ext_backing_format: " | |
234 | "Could not read format name"); | |
f965509c | 235 | return 3; |
3ef6c40a | 236 | } |
f965509c | 237 | bs->backing_format[ext.len] = '\0'; |
e4603fe1 | 238 | s->image_backing_format = g_strdup(bs->backing_format); |
f965509c AL |
239 | #ifdef DEBUG_EXT |
240 | printf("Qcow2: Got format extension %s\n", bs->backing_format); | |
241 | #endif | |
f965509c AL |
242 | break; |
243 | ||
cfcc4c62 KW |
244 | case QCOW2_EXT_MAGIC_FEATURE_TABLE: |
245 | if (p_feature_table != NULL) { | |
246 | void* feature_table = g_malloc0(ext.len + 2 * sizeof(Qcow2Feature)); | |
cf2ab8fc | 247 | ret = bdrv_pread(bs->file, offset , feature_table, ext.len); |
cfcc4c62 | 248 | if (ret < 0) { |
3ef6c40a HR |
249 | error_setg_errno(errp, -ret, "ERROR: ext_feature_table: " |
250 | "Could not read table"); | |
cfcc4c62 KW |
251 | return ret; |
252 | } | |
253 | ||
254 | *p_feature_table = feature_table; | |
255 | } | |
256 | break; | |
257 | ||
4652b8f3 DB |
258 | case QCOW2_EXT_MAGIC_CRYPTO_HEADER: { |
259 | unsigned int cflags = 0; | |
260 | if (s->crypt_method_header != QCOW_CRYPT_LUKS) { | |
261 | error_setg(errp, "CRYPTO header extension only " | |
262 | "expected with LUKS encryption method"); | |
263 | return -EINVAL; | |
264 | } | |
265 | if (ext.len != sizeof(Qcow2CryptoHeaderExtension)) { | |
266 | error_setg(errp, "CRYPTO header extension size %u, " | |
267 | "but expected size %zu", ext.len, | |
268 | sizeof(Qcow2CryptoHeaderExtension)); | |
269 | return -EINVAL; | |
270 | } | |
271 | ||
272 | ret = bdrv_pread(bs->file, offset, &s->crypto_header, ext.len); | |
273 | if (ret < 0) { | |
274 | error_setg_errno(errp, -ret, | |
275 | "Unable to read CRYPTO header extension"); | |
276 | return ret; | |
277 | } | |
278 | be64_to_cpus(&s->crypto_header.offset); | |
279 | be64_to_cpus(&s->crypto_header.length); | |
280 | ||
281 | if ((s->crypto_header.offset % s->cluster_size) != 0) { | |
282 | error_setg(errp, "Encryption header offset '%" PRIu64 "' is " | |
283 | "not a multiple of cluster size '%u'", | |
284 | s->crypto_header.offset, s->cluster_size); | |
285 | return -EINVAL; | |
286 | } | |
287 | ||
288 | if (flags & BDRV_O_NO_IO) { | |
289 | cflags |= QCRYPTO_BLOCK_OPEN_NO_IO; | |
290 | } | |
1cd9a787 | 291 | s->crypto = qcrypto_block_open(s->crypto_opts, "encrypt.", |
4652b8f3 DB |
292 | qcow2_crypto_hdr_read_func, |
293 | bs, cflags, errp); | |
294 | if (!s->crypto) { | |
295 | return -EINVAL; | |
296 | } | |
297 | } break; | |
298 | ||
88ddffae VSO |
299 | case QCOW2_EXT_MAGIC_BITMAPS: |
300 | if (ext.len != sizeof(bitmaps_ext)) { | |
301 | error_setg_errno(errp, -ret, "bitmaps_ext: " | |
302 | "Invalid extension length"); | |
303 | return -EINVAL; | |
304 | } | |
305 | ||
306 | if (!(s->autoclear_features & QCOW2_AUTOCLEAR_BITMAPS)) { | |
c9ceb3ec HR |
307 | if (s->qcow_version < 3) { |
308 | /* Let's be a bit more specific */ | |
309 | warn_report("This qcow2 v2 image contains bitmaps, but " | |
310 | "they may have been modified by a program " | |
311 | "without persistent bitmap support; so now " | |
312 | "they must all be considered inconsistent"); | |
313 | } else { | |
314 | warn_report("a program lacking bitmap support " | |
315 | "modified this file, so all bitmaps are now " | |
316 | "considered inconsistent"); | |
317 | } | |
55d527a9 AF |
318 | error_printf("Some clusters may be leaked, " |
319 | "run 'qemu-img check -r' on the image " | |
88ddffae VSO |
320 | "file to fix."); |
321 | if (need_update_header != NULL) { | |
322 | /* Updating is needed to drop invalid bitmap extension. */ | |
323 | *need_update_header = true; | |
324 | } | |
325 | break; | |
326 | } | |
327 | ||
328 | ret = bdrv_pread(bs->file, offset, &bitmaps_ext, ext.len); | |
329 | if (ret < 0) { | |
330 | error_setg_errno(errp, -ret, "bitmaps_ext: " | |
331 | "Could not read ext header"); | |
332 | return ret; | |
333 | } | |
334 | ||
335 | if (bitmaps_ext.reserved32 != 0) { | |
336 | error_setg_errno(errp, -ret, "bitmaps_ext: " | |
337 | "Reserved field is not zero"); | |
338 | return -EINVAL; | |
339 | } | |
340 | ||
341 | be32_to_cpus(&bitmaps_ext.nb_bitmaps); | |
342 | be64_to_cpus(&bitmaps_ext.bitmap_directory_size); | |
343 | be64_to_cpus(&bitmaps_ext.bitmap_directory_offset); | |
344 | ||
345 | if (bitmaps_ext.nb_bitmaps > QCOW2_MAX_BITMAPS) { | |
346 | error_setg(errp, | |
347 | "bitmaps_ext: Image has %" PRIu32 " bitmaps, " | |
348 | "exceeding the QEMU supported maximum of %d", | |
349 | bitmaps_ext.nb_bitmaps, QCOW2_MAX_BITMAPS); | |
350 | return -EINVAL; | |
351 | } | |
352 | ||
353 | if (bitmaps_ext.nb_bitmaps == 0) { | |
354 | error_setg(errp, "found bitmaps extension with zero bitmaps"); | |
355 | return -EINVAL; | |
356 | } | |
357 | ||
358 | if (bitmaps_ext.bitmap_directory_offset & (s->cluster_size - 1)) { | |
359 | error_setg(errp, "bitmaps_ext: " | |
360 | "invalid bitmap directory offset"); | |
361 | return -EINVAL; | |
362 | } | |
363 | ||
364 | if (bitmaps_ext.bitmap_directory_size > | |
365 | QCOW2_MAX_BITMAP_DIRECTORY_SIZE) { | |
366 | error_setg(errp, "bitmaps_ext: " | |
367 | "bitmap directory size (%" PRIu64 ") exceeds " | |
368 | "the maximum supported size (%d)", | |
369 | bitmaps_ext.bitmap_directory_size, | |
370 | QCOW2_MAX_BITMAP_DIRECTORY_SIZE); | |
371 | return -EINVAL; | |
372 | } | |
373 | ||
374 | s->nb_bitmaps = bitmaps_ext.nb_bitmaps; | |
375 | s->bitmap_directory_offset = | |
376 | bitmaps_ext.bitmap_directory_offset; | |
377 | s->bitmap_directory_size = | |
378 | bitmaps_ext.bitmap_directory_size; | |
379 | ||
380 | #ifdef DEBUG_EXT | |
381 | printf("Qcow2: Got bitmaps extension: " | |
382 | "offset=%" PRIu64 " nb_bitmaps=%" PRIu32 "\n", | |
383 | s->bitmap_directory_offset, s->nb_bitmaps); | |
384 | #endif | |
385 | break; | |
386 | ||
9b80ddf3 | 387 | default: |
75bab85c | 388 | /* unknown magic - save it in case we need to rewrite the header */ |
4096974e EB |
389 | /* If you add a new feature, make sure to also update the fast |
390 | * path of qcow2_make_empty() to deal with it. */ | |
75bab85c KW |
391 | { |
392 | Qcow2UnknownHeaderExtension *uext; | |
393 | ||
394 | uext = g_malloc0(sizeof(*uext) + ext.len); | |
395 | uext->magic = ext.magic; | |
396 | uext->len = ext.len; | |
397 | QLIST_INSERT_HEAD(&s->unknown_header_ext, uext, next); | |
398 | ||
cf2ab8fc | 399 | ret = bdrv_pread(bs->file, offset , uext->data, uext->len); |
75bab85c | 400 | if (ret < 0) { |
3ef6c40a HR |
401 | error_setg_errno(errp, -ret, "ERROR: unknown extension: " |
402 | "Could not read data"); | |
75bab85c KW |
403 | return ret; |
404 | } | |
75bab85c | 405 | } |
9b80ddf3 AL |
406 | break; |
407 | } | |
fd29b4bb KW |
408 | |
409 | offset += ((ext.len + 7) & ~7); | |
9b80ddf3 AL |
410 | } |
411 | ||
412 | return 0; | |
413 | } | |
414 | ||
75bab85c KW |
415 | static void cleanup_unknown_header_ext(BlockDriverState *bs) |
416 | { | |
ff99129a | 417 | BDRVQcow2State *s = bs->opaque; |
75bab85c KW |
418 | Qcow2UnknownHeaderExtension *uext, *next; |
419 | ||
420 | QLIST_FOREACH_SAFE(uext, &s->unknown_header_ext, next, next) { | |
421 | QLIST_REMOVE(uext, next); | |
422 | g_free(uext); | |
423 | } | |
424 | } | |
9b80ddf3 | 425 | |
a55448b3 HR |
426 | static void report_unsupported_feature(Error **errp, Qcow2Feature *table, |
427 | uint64_t mask) | |
cfcc4c62 | 428 | { |
12ac6d3d KW |
429 | char *features = g_strdup(""); |
430 | char *old; | |
431 | ||
cfcc4c62 KW |
432 | while (table && table->name[0] != '\0') { |
433 | if (table->type == QCOW2_FEAT_TYPE_INCOMPATIBLE) { | |
12ac6d3d KW |
434 | if (mask & (1ULL << table->bit)) { |
435 | old = features; | |
436 | features = g_strdup_printf("%s%s%.46s", old, *old ? ", " : "", | |
437 | table->name); | |
438 | g_free(old); | |
439 | mask &= ~(1ULL << table->bit); | |
cfcc4c62 KW |
440 | } |
441 | } | |
442 | table++; | |
443 | } | |
444 | ||
445 | if (mask) { | |
12ac6d3d KW |
446 | old = features; |
447 | features = g_strdup_printf("%s%sUnknown incompatible feature: %" PRIx64, | |
448 | old, *old ? ", " : "", mask); | |
449 | g_free(old); | |
cfcc4c62 | 450 | } |
12ac6d3d | 451 | |
a55448b3 | 452 | error_setg(errp, "Unsupported qcow2 feature(s): %s", features); |
12ac6d3d | 453 | g_free(features); |
cfcc4c62 KW |
454 | } |
455 | ||
bfe8043e SH |
456 | /* |
457 | * Sets the dirty bit and flushes afterwards if necessary. | |
458 | * | |
459 | * The incompatible_features bit is only set if the image file header was | |
460 | * updated successfully. Therefore it is not required to check the return | |
461 | * value of this function. | |
462 | */ | |
280d3735 | 463 | int qcow2_mark_dirty(BlockDriverState *bs) |
bfe8043e | 464 | { |
ff99129a | 465 | BDRVQcow2State *s = bs->opaque; |
bfe8043e SH |
466 | uint64_t val; |
467 | int ret; | |
468 | ||
469 | assert(s->qcow_version >= 3); | |
470 | ||
471 | if (s->incompatible_features & QCOW2_INCOMPAT_DIRTY) { | |
472 | return 0; /* already dirty */ | |
473 | } | |
474 | ||
475 | val = cpu_to_be64(s->incompatible_features | QCOW2_INCOMPAT_DIRTY); | |
d9ca2ea2 | 476 | ret = bdrv_pwrite(bs->file, offsetof(QCowHeader, incompatible_features), |
bfe8043e SH |
477 | &val, sizeof(val)); |
478 | if (ret < 0) { | |
479 | return ret; | |
480 | } | |
9a4f4c31 | 481 | ret = bdrv_flush(bs->file->bs); |
bfe8043e SH |
482 | if (ret < 0) { |
483 | return ret; | |
484 | } | |
485 | ||
486 | /* Only treat image as dirty if the header was updated successfully */ | |
487 | s->incompatible_features |= QCOW2_INCOMPAT_DIRTY; | |
488 | return 0; | |
489 | } | |
490 | ||
c61d0004 SH |
491 | /* |
492 | * Clears the dirty bit and flushes before if necessary. Only call this | |
493 | * function when there are no pending requests, it does not guard against | |
494 | * concurrent requests dirtying the image. | |
495 | */ | |
496 | static int qcow2_mark_clean(BlockDriverState *bs) | |
497 | { | |
ff99129a | 498 | BDRVQcow2State *s = bs->opaque; |
c61d0004 SH |
499 | |
500 | if (s->incompatible_features & QCOW2_INCOMPAT_DIRTY) { | |
4c2e5f8f KW |
501 | int ret; |
502 | ||
503 | s->incompatible_features &= ~QCOW2_INCOMPAT_DIRTY; | |
504 | ||
8b220eb7 | 505 | ret = qcow2_flush_caches(bs); |
c61d0004 SH |
506 | if (ret < 0) { |
507 | return ret; | |
508 | } | |
509 | ||
c61d0004 SH |
510 | return qcow2_update_header(bs); |
511 | } | |
512 | return 0; | |
513 | } | |
514 | ||
69c98726 HR |
515 | /* |
516 | * Marks the image as corrupt. | |
517 | */ | |
518 | int qcow2_mark_corrupt(BlockDriverState *bs) | |
519 | { | |
ff99129a | 520 | BDRVQcow2State *s = bs->opaque; |
69c98726 HR |
521 | |
522 | s->incompatible_features |= QCOW2_INCOMPAT_CORRUPT; | |
523 | return qcow2_update_header(bs); | |
524 | } | |
525 | ||
526 | /* | |
527 | * Marks the image as consistent, i.e., unsets the corrupt bit, and flushes | |
528 | * before if necessary. | |
529 | */ | |
530 | int qcow2_mark_consistent(BlockDriverState *bs) | |
531 | { | |
ff99129a | 532 | BDRVQcow2State *s = bs->opaque; |
69c98726 HR |
533 | |
534 | if (s->incompatible_features & QCOW2_INCOMPAT_CORRUPT) { | |
8b220eb7 | 535 | int ret = qcow2_flush_caches(bs); |
69c98726 HR |
536 | if (ret < 0) { |
537 | return ret; | |
538 | } | |
539 | ||
540 | s->incompatible_features &= ~QCOW2_INCOMPAT_CORRUPT; | |
541 | return qcow2_update_header(bs); | |
542 | } | |
543 | return 0; | |
544 | } | |
545 | ||
2fd61638 PB |
546 | static int coroutine_fn qcow2_co_check_locked(BlockDriverState *bs, |
547 | BdrvCheckResult *result, | |
548 | BdrvCheckMode fix) | |
acbe5982 SH |
549 | { |
550 | int ret = qcow2_check_refcounts(bs, result, fix); | |
551 | if (ret < 0) { | |
552 | return ret; | |
553 | } | |
554 | ||
555 | if (fix && result->check_errors == 0 && result->corruptions == 0) { | |
24530f3e HR |
556 | ret = qcow2_mark_clean(bs); |
557 | if (ret < 0) { | |
558 | return ret; | |
559 | } | |
560 | return qcow2_mark_consistent(bs); | |
acbe5982 SH |
561 | } |
562 | return ret; | |
563 | } | |
564 | ||
2fd61638 PB |
565 | static int coroutine_fn qcow2_co_check(BlockDriverState *bs, |
566 | BdrvCheckResult *result, | |
567 | BdrvCheckMode fix) | |
568 | { | |
569 | BDRVQcow2State *s = bs->opaque; | |
570 | int ret; | |
571 | ||
572 | qemu_co_mutex_lock(&s->lock); | |
573 | ret = qcow2_co_check_locked(bs, result, fix); | |
574 | qemu_co_mutex_unlock(&s->lock); | |
575 | return ret; | |
576 | } | |
577 | ||
0cf0e598 AG |
578 | int qcow2_validate_table(BlockDriverState *bs, uint64_t offset, |
579 | uint64_t entries, size_t entry_len, | |
580 | int64_t max_size_bytes, const char *table_name, | |
581 | Error **errp) | |
8c7de283 | 582 | { |
ff99129a | 583 | BDRVQcow2State *s = bs->opaque; |
8c7de283 | 584 | |
0cf0e598 AG |
585 | if (entries > max_size_bytes / entry_len) { |
586 | error_setg(errp, "%s too large", table_name); | |
587 | return -EFBIG; | |
8c7de283 KW |
588 | } |
589 | ||
0cf0e598 AG |
590 | /* Use signed INT64_MAX as the maximum even for uint64_t header fields, |
591 | * because values will be passed to qemu functions taking int64_t. */ | |
592 | if ((INT64_MAX - entries * entry_len < offset) || | |
593 | (offset_into_cluster(s, offset) != 0)) { | |
594 | error_setg(errp, "%s offset invalid", table_name); | |
8c7de283 KW |
595 | return -EINVAL; |
596 | } | |
597 | ||
598 | return 0; | |
599 | } | |
600 | ||
74c4510a KW |
601 | static QemuOptsList qcow2_runtime_opts = { |
602 | .name = "qcow2", | |
603 | .head = QTAILQ_HEAD_INITIALIZER(qcow2_runtime_opts.head), | |
604 | .desc = { | |
605 | { | |
64aa99d3 | 606 | .name = QCOW2_OPT_LAZY_REFCOUNTS, |
74c4510a KW |
607 | .type = QEMU_OPT_BOOL, |
608 | .help = "Postpone refcount updates", | |
609 | }, | |
67af674e KW |
610 | { |
611 | .name = QCOW2_OPT_DISCARD_REQUEST, | |
612 | .type = QEMU_OPT_BOOL, | |
613 | .help = "Pass guest discard requests to the layer below", | |
614 | }, | |
615 | { | |
616 | .name = QCOW2_OPT_DISCARD_SNAPSHOT, | |
617 | .type = QEMU_OPT_BOOL, | |
618 | .help = "Generate discard requests when snapshot related space " | |
619 | "is freed", | |
620 | }, | |
621 | { | |
622 | .name = QCOW2_OPT_DISCARD_OTHER, | |
623 | .type = QEMU_OPT_BOOL, | |
624 | .help = "Generate discard requests when other clusters are freed", | |
625 | }, | |
05de7e86 HR |
626 | { |
627 | .name = QCOW2_OPT_OVERLAP, | |
628 | .type = QEMU_OPT_STRING, | |
629 | .help = "Selects which overlap checks to perform from a range of " | |
630 | "templates (none, constant, cached, all)", | |
631 | }, | |
ee42b5ce HR |
632 | { |
633 | .name = QCOW2_OPT_OVERLAP_TEMPLATE, | |
634 | .type = QEMU_OPT_STRING, | |
635 | .help = "Selects which overlap checks to perform from a range of " | |
636 | "templates (none, constant, cached, all)", | |
637 | }, | |
05de7e86 HR |
638 | { |
639 | .name = QCOW2_OPT_OVERLAP_MAIN_HEADER, | |
640 | .type = QEMU_OPT_BOOL, | |
641 | .help = "Check for unintended writes into the main qcow2 header", | |
642 | }, | |
643 | { | |
644 | .name = QCOW2_OPT_OVERLAP_ACTIVE_L1, | |
645 | .type = QEMU_OPT_BOOL, | |
646 | .help = "Check for unintended writes into the active L1 table", | |
647 | }, | |
648 | { | |
649 | .name = QCOW2_OPT_OVERLAP_ACTIVE_L2, | |
650 | .type = QEMU_OPT_BOOL, | |
651 | .help = "Check for unintended writes into an active L2 table", | |
652 | }, | |
653 | { | |
654 | .name = QCOW2_OPT_OVERLAP_REFCOUNT_TABLE, | |
655 | .type = QEMU_OPT_BOOL, | |
656 | .help = "Check for unintended writes into the refcount table", | |
657 | }, | |
658 | { | |
659 | .name = QCOW2_OPT_OVERLAP_REFCOUNT_BLOCK, | |
660 | .type = QEMU_OPT_BOOL, | |
661 | .help = "Check for unintended writes into a refcount block", | |
662 | }, | |
663 | { | |
664 | .name = QCOW2_OPT_OVERLAP_SNAPSHOT_TABLE, | |
665 | .type = QEMU_OPT_BOOL, | |
666 | .help = "Check for unintended writes into the snapshot table", | |
667 | }, | |
668 | { | |
669 | .name = QCOW2_OPT_OVERLAP_INACTIVE_L1, | |
670 | .type = QEMU_OPT_BOOL, | |
671 | .help = "Check for unintended writes into an inactive L1 table", | |
672 | }, | |
673 | { | |
674 | .name = QCOW2_OPT_OVERLAP_INACTIVE_L2, | |
675 | .type = QEMU_OPT_BOOL, | |
676 | .help = "Check for unintended writes into an inactive L2 table", | |
677 | }, | |
6c1c8d5d HR |
678 | { |
679 | .name = QCOW2_OPT_CACHE_SIZE, | |
680 | .type = QEMU_OPT_SIZE, | |
681 | .help = "Maximum combined metadata (L2 tables and refcount blocks) " | |
682 | "cache size", | |
683 | }, | |
684 | { | |
685 | .name = QCOW2_OPT_L2_CACHE_SIZE, | |
686 | .type = QEMU_OPT_SIZE, | |
687 | .help = "Maximum L2 table cache size", | |
688 | }, | |
1221fe6f AG |
689 | { |
690 | .name = QCOW2_OPT_L2_CACHE_ENTRY_SIZE, | |
691 | .type = QEMU_OPT_SIZE, | |
692 | .help = "Size of each entry in the L2 cache", | |
693 | }, | |
6c1c8d5d HR |
694 | { |
695 | .name = QCOW2_OPT_REFCOUNT_CACHE_SIZE, | |
696 | .type = QEMU_OPT_SIZE, | |
697 | .help = "Maximum refcount block cache size", | |
698 | }, | |
279621c0 AG |
699 | { |
700 | .name = QCOW2_OPT_CACHE_CLEAN_INTERVAL, | |
701 | .type = QEMU_OPT_NUMBER, | |
702 | .help = "Clean unused cache entries after this time (in seconds)", | |
703 | }, | |
4652b8f3 DB |
704 | BLOCK_CRYPTO_OPT_DEF_KEY_SECRET("encrypt.", |
705 | "ID of secret providing qcow2 AES key or LUKS passphrase"), | |
74c4510a KW |
706 | { /* end of list */ } |
707 | }, | |
708 | }; | |
709 | ||
4092e99d HR |
710 | static const char *overlap_bool_option_names[QCOW2_OL_MAX_BITNR] = { |
711 | [QCOW2_OL_MAIN_HEADER_BITNR] = QCOW2_OPT_OVERLAP_MAIN_HEADER, | |
712 | [QCOW2_OL_ACTIVE_L1_BITNR] = QCOW2_OPT_OVERLAP_ACTIVE_L1, | |
713 | [QCOW2_OL_ACTIVE_L2_BITNR] = QCOW2_OPT_OVERLAP_ACTIVE_L2, | |
714 | [QCOW2_OL_REFCOUNT_TABLE_BITNR] = QCOW2_OPT_OVERLAP_REFCOUNT_TABLE, | |
715 | [QCOW2_OL_REFCOUNT_BLOCK_BITNR] = QCOW2_OPT_OVERLAP_REFCOUNT_BLOCK, | |
716 | [QCOW2_OL_SNAPSHOT_TABLE_BITNR] = QCOW2_OPT_OVERLAP_SNAPSHOT_TABLE, | |
717 | [QCOW2_OL_INACTIVE_L1_BITNR] = QCOW2_OPT_OVERLAP_INACTIVE_L1, | |
718 | [QCOW2_OL_INACTIVE_L2_BITNR] = QCOW2_OPT_OVERLAP_INACTIVE_L2, | |
719 | }; | |
720 | ||
279621c0 AG |
721 | static void cache_clean_timer_cb(void *opaque) |
722 | { | |
723 | BlockDriverState *bs = opaque; | |
ff99129a | 724 | BDRVQcow2State *s = bs->opaque; |
b2f68bff AG |
725 | qcow2_cache_clean_unused(s->l2_table_cache); |
726 | qcow2_cache_clean_unused(s->refcount_block_cache); | |
279621c0 AG |
727 | timer_mod(s->cache_clean_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + |
728 | (int64_t) s->cache_clean_interval * 1000); | |
729 | } | |
730 | ||
731 | static void cache_clean_timer_init(BlockDriverState *bs, AioContext *context) | |
732 | { | |
ff99129a | 733 | BDRVQcow2State *s = bs->opaque; |
279621c0 AG |
734 | if (s->cache_clean_interval > 0) { |
735 | s->cache_clean_timer = aio_timer_new(context, QEMU_CLOCK_VIRTUAL, | |
736 | SCALE_MS, cache_clean_timer_cb, | |
737 | bs); | |
738 | timer_mod(s->cache_clean_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + | |
739 | (int64_t) s->cache_clean_interval * 1000); | |
740 | } | |
741 | } | |
742 | ||
743 | static void cache_clean_timer_del(BlockDriverState *bs) | |
744 | { | |
ff99129a | 745 | BDRVQcow2State *s = bs->opaque; |
279621c0 AG |
746 | if (s->cache_clean_timer) { |
747 | timer_del(s->cache_clean_timer); | |
748 | timer_free(s->cache_clean_timer); | |
749 | s->cache_clean_timer = NULL; | |
750 | } | |
751 | } | |
752 | ||
753 | static void qcow2_detach_aio_context(BlockDriverState *bs) | |
754 | { | |
755 | cache_clean_timer_del(bs); | |
756 | } | |
757 | ||
758 | static void qcow2_attach_aio_context(BlockDriverState *bs, | |
759 | AioContext *new_context) | |
760 | { | |
761 | cache_clean_timer_init(bs, new_context); | |
762 | } | |
763 | ||
bc85ef26 HR |
764 | static void read_cache_sizes(BlockDriverState *bs, QemuOpts *opts, |
765 | uint64_t *l2_cache_size, | |
1221fe6f | 766 | uint64_t *l2_cache_entry_size, |
6c1c8d5d HR |
767 | uint64_t *refcount_cache_size, Error **errp) |
768 | { | |
ff99129a | 769 | BDRVQcow2State *s = bs->opaque; |
6c1c8d5d HR |
770 | uint64_t combined_cache_size; |
771 | bool l2_cache_size_set, refcount_cache_size_set, combined_cache_size_set; | |
7af5eea9 | 772 | int min_refcount_cache = MIN_REFCOUNT_CACHE_SIZE * s->cluster_size; |
6c1c8d5d HR |
773 | |
774 | combined_cache_size_set = qemu_opt_get(opts, QCOW2_OPT_CACHE_SIZE); | |
775 | l2_cache_size_set = qemu_opt_get(opts, QCOW2_OPT_L2_CACHE_SIZE); | |
776 | refcount_cache_size_set = qemu_opt_get(opts, QCOW2_OPT_REFCOUNT_CACHE_SIZE); | |
777 | ||
778 | combined_cache_size = qemu_opt_get_size(opts, QCOW2_OPT_CACHE_SIZE, 0); | |
779 | *l2_cache_size = qemu_opt_get_size(opts, QCOW2_OPT_L2_CACHE_SIZE, 0); | |
780 | *refcount_cache_size = qemu_opt_get_size(opts, | |
781 | QCOW2_OPT_REFCOUNT_CACHE_SIZE, 0); | |
782 | ||
1221fe6f AG |
783 | *l2_cache_entry_size = qemu_opt_get_size( |
784 | opts, QCOW2_OPT_L2_CACHE_ENTRY_SIZE, s->cluster_size); | |
785 | ||
6c1c8d5d HR |
786 | if (combined_cache_size_set) { |
787 | if (l2_cache_size_set && refcount_cache_size_set) { | |
788 | error_setg(errp, QCOW2_OPT_CACHE_SIZE ", " QCOW2_OPT_L2_CACHE_SIZE | |
789 | " and " QCOW2_OPT_REFCOUNT_CACHE_SIZE " may not be set " | |
790 | "the same time"); | |
791 | return; | |
792 | } else if (*l2_cache_size > combined_cache_size) { | |
793 | error_setg(errp, QCOW2_OPT_L2_CACHE_SIZE " may not exceed " | |
794 | QCOW2_OPT_CACHE_SIZE); | |
795 | return; | |
796 | } else if (*refcount_cache_size > combined_cache_size) { | |
797 | error_setg(errp, QCOW2_OPT_REFCOUNT_CACHE_SIZE " may not exceed " | |
798 | QCOW2_OPT_CACHE_SIZE); | |
799 | return; | |
800 | } | |
801 | ||
802 | if (l2_cache_size_set) { | |
803 | *refcount_cache_size = combined_cache_size - *l2_cache_size; | |
804 | } else if (refcount_cache_size_set) { | |
805 | *l2_cache_size = combined_cache_size - *refcount_cache_size; | |
806 | } else { | |
52253998 AG |
807 | uint64_t virtual_disk_size = bs->total_sectors * BDRV_SECTOR_SIZE; |
808 | uint64_t max_l2_cache = virtual_disk_size / (s->cluster_size / 8); | |
52253998 AG |
809 | |
810 | /* Assign as much memory as possible to the L2 cache, and | |
811 | * use the remainder for the refcount cache */ | |
812 | if (combined_cache_size >= max_l2_cache + min_refcount_cache) { | |
813 | *l2_cache_size = max_l2_cache; | |
814 | *refcount_cache_size = combined_cache_size - *l2_cache_size; | |
815 | } else { | |
816 | *refcount_cache_size = | |
817 | MIN(combined_cache_size, min_refcount_cache); | |
818 | *l2_cache_size = combined_cache_size - *refcount_cache_size; | |
819 | } | |
6c1c8d5d HR |
820 | } |
821 | } else { | |
52253998 | 822 | if (!l2_cache_size_set) { |
bc85ef26 HR |
823 | *l2_cache_size = MAX(DEFAULT_L2_CACHE_BYTE_SIZE, |
824 | (uint64_t)DEFAULT_L2_CACHE_CLUSTERS | |
825 | * s->cluster_size); | |
52253998 AG |
826 | } |
827 | if (!refcount_cache_size_set) { | |
7af5eea9 | 828 | *refcount_cache_size = min_refcount_cache; |
6c1c8d5d HR |
829 | } |
830 | } | |
1221fe6f AG |
831 | |
832 | if (*l2_cache_entry_size < (1 << MIN_CLUSTER_BITS) || | |
833 | *l2_cache_entry_size > s->cluster_size || | |
834 | !is_power_of_2(*l2_cache_entry_size)) { | |
835 | error_setg(errp, "L2 cache entry size must be a power of two " | |
836 | "between %d and the cluster size (%d)", | |
837 | 1 << MIN_CLUSTER_BITS, s->cluster_size); | |
838 | return; | |
839 | } | |
6c1c8d5d HR |
840 | } |
841 | ||
ee55b173 KW |
842 | typedef struct Qcow2ReopenState { |
843 | Qcow2Cache *l2_table_cache; | |
844 | Qcow2Cache *refcount_block_cache; | |
3c2e511a | 845 | int l2_slice_size; /* Number of entries in a slice of the L2 table */ |
ee55b173 KW |
846 | bool use_lazy_refcounts; |
847 | int overlap_check; | |
848 | bool discard_passthrough[QCOW2_DISCARD_MAX]; | |
849 | uint64_t cache_clean_interval; | |
b25b387f | 850 | QCryptoBlockOpenOptions *crypto_opts; /* Disk encryption runtime options */ |
ee55b173 KW |
851 | } Qcow2ReopenState; |
852 | ||
853 | static int qcow2_update_options_prepare(BlockDriverState *bs, | |
854 | Qcow2ReopenState *r, | |
855 | QDict *options, int flags, | |
856 | Error **errp) | |
4c75d1a1 KW |
857 | { |
858 | BDRVQcow2State *s = bs->opaque; | |
94edf3fb | 859 | QemuOpts *opts = NULL; |
4c75d1a1 KW |
860 | const char *opt_overlap_check, *opt_overlap_check_template; |
861 | int overlap_check_template = 0; | |
1221fe6f | 862 | uint64_t l2_cache_size, l2_cache_entry_size, refcount_cache_size; |
4c75d1a1 | 863 | int i; |
b25b387f DB |
864 | const char *encryptfmt; |
865 | QDict *encryptopts = NULL; | |
94edf3fb | 866 | Error *local_err = NULL; |
4c75d1a1 KW |
867 | int ret; |
868 | ||
b25b387f DB |
869 | qdict_extract_subqdict(options, &encryptopts, "encrypt."); |
870 | encryptfmt = qdict_get_try_str(encryptopts, "format"); | |
871 | ||
94edf3fb KW |
872 | opts = qemu_opts_create(&qcow2_runtime_opts, NULL, 0, &error_abort); |
873 | qemu_opts_absorb_qdict(opts, options, &local_err); | |
874 | if (local_err) { | |
875 | error_propagate(errp, local_err); | |
876 | ret = -EINVAL; | |
877 | goto fail; | |
878 | } | |
879 | ||
880 | /* get L2 table/refcount block cache size from command line options */ | |
1221fe6f AG |
881 | read_cache_sizes(bs, opts, &l2_cache_size, &l2_cache_entry_size, |
882 | &refcount_cache_size, &local_err); | |
94edf3fb KW |
883 | if (local_err) { |
884 | error_propagate(errp, local_err); | |
885 | ret = -EINVAL; | |
886 | goto fail; | |
887 | } | |
888 | ||
1221fe6f | 889 | l2_cache_size /= l2_cache_entry_size; |
94edf3fb KW |
890 | if (l2_cache_size < MIN_L2_CACHE_SIZE) { |
891 | l2_cache_size = MIN_L2_CACHE_SIZE; | |
892 | } | |
893 | if (l2_cache_size > INT_MAX) { | |
894 | error_setg(errp, "L2 cache size too big"); | |
895 | ret = -EINVAL; | |
896 | goto fail; | |
897 | } | |
898 | ||
899 | refcount_cache_size /= s->cluster_size; | |
900 | if (refcount_cache_size < MIN_REFCOUNT_CACHE_SIZE) { | |
901 | refcount_cache_size = MIN_REFCOUNT_CACHE_SIZE; | |
902 | } | |
903 | if (refcount_cache_size > INT_MAX) { | |
904 | error_setg(errp, "Refcount cache size too big"); | |
905 | ret = -EINVAL; | |
906 | goto fail; | |
907 | } | |
908 | ||
5b0959a7 KW |
909 | /* alloc new L2 table/refcount block cache, flush old one */ |
910 | if (s->l2_table_cache) { | |
911 | ret = qcow2_cache_flush(bs, s->l2_table_cache); | |
912 | if (ret) { | |
913 | error_setg_errno(errp, -ret, "Failed to flush the L2 table cache"); | |
914 | goto fail; | |
915 | } | |
916 | } | |
917 | ||
918 | if (s->refcount_block_cache) { | |
919 | ret = qcow2_cache_flush(bs, s->refcount_block_cache); | |
920 | if (ret) { | |
921 | error_setg_errno(errp, -ret, | |
922 | "Failed to flush the refcount block cache"); | |
923 | goto fail; | |
924 | } | |
925 | } | |
926 | ||
1221fe6f AG |
927 | r->l2_slice_size = l2_cache_entry_size / sizeof(uint64_t); |
928 | r->l2_table_cache = qcow2_cache_create(bs, l2_cache_size, | |
929 | l2_cache_entry_size); | |
930 | r->refcount_block_cache = qcow2_cache_create(bs, refcount_cache_size, | |
931 | s->cluster_size); | |
ee55b173 | 932 | if (r->l2_table_cache == NULL || r->refcount_block_cache == NULL) { |
94edf3fb KW |
933 | error_setg(errp, "Could not allocate metadata caches"); |
934 | ret = -ENOMEM; | |
935 | goto fail; | |
936 | } | |
937 | ||
938 | /* New interval for cache cleanup timer */ | |
ee55b173 | 939 | r->cache_clean_interval = |
5b0959a7 KW |
940 | qemu_opt_get_number(opts, QCOW2_OPT_CACHE_CLEAN_INTERVAL, |
941 | s->cache_clean_interval); | |
91203f08 AG |
942 | #ifndef CONFIG_LINUX |
943 | if (r->cache_clean_interval != 0) { | |
944 | error_setg(errp, QCOW2_OPT_CACHE_CLEAN_INTERVAL | |
945 | " not supported on this host"); | |
946 | ret = -EINVAL; | |
947 | goto fail; | |
948 | } | |
949 | #endif | |
ee55b173 | 950 | if (r->cache_clean_interval > UINT_MAX) { |
94edf3fb KW |
951 | error_setg(errp, "Cache clean interval too big"); |
952 | ret = -EINVAL; | |
953 | goto fail; | |
954 | } | |
94edf3fb | 955 | |
5b0959a7 | 956 | /* lazy-refcounts; flush if going from enabled to disabled */ |
ee55b173 | 957 | r->use_lazy_refcounts = qemu_opt_get_bool(opts, QCOW2_OPT_LAZY_REFCOUNTS, |
4c75d1a1 | 958 | (s->compatible_features & QCOW2_COMPAT_LAZY_REFCOUNTS)); |
ee55b173 | 959 | if (r->use_lazy_refcounts && s->qcow_version < 3) { |
007dbc39 KW |
960 | error_setg(errp, "Lazy refcounts require a qcow2 image with at least " |
961 | "qemu 1.1 compatibility level"); | |
962 | ret = -EINVAL; | |
963 | goto fail; | |
964 | } | |
4c75d1a1 | 965 | |
5b0959a7 KW |
966 | if (s->use_lazy_refcounts && !r->use_lazy_refcounts) { |
967 | ret = qcow2_mark_clean(bs); | |
968 | if (ret < 0) { | |
969 | error_setg_errno(errp, -ret, "Failed to disable lazy refcounts"); | |
970 | goto fail; | |
971 | } | |
972 | } | |
973 | ||
007dbc39 | 974 | /* Overlap check options */ |
4c75d1a1 KW |
975 | opt_overlap_check = qemu_opt_get(opts, QCOW2_OPT_OVERLAP); |
976 | opt_overlap_check_template = qemu_opt_get(opts, QCOW2_OPT_OVERLAP_TEMPLATE); | |
977 | if (opt_overlap_check_template && opt_overlap_check && | |
978 | strcmp(opt_overlap_check_template, opt_overlap_check)) | |
979 | { | |
980 | error_setg(errp, "Conflicting values for qcow2 options '" | |
981 | QCOW2_OPT_OVERLAP "' ('%s') and '" QCOW2_OPT_OVERLAP_TEMPLATE | |
982 | "' ('%s')", opt_overlap_check, opt_overlap_check_template); | |
983 | ret = -EINVAL; | |
984 | goto fail; | |
985 | } | |
986 | if (!opt_overlap_check) { | |
987 | opt_overlap_check = opt_overlap_check_template ?: "cached"; | |
988 | } | |
989 | ||
990 | if (!strcmp(opt_overlap_check, "none")) { | |
991 | overlap_check_template = 0; | |
992 | } else if (!strcmp(opt_overlap_check, "constant")) { | |
993 | overlap_check_template = QCOW2_OL_CONSTANT; | |
994 | } else if (!strcmp(opt_overlap_check, "cached")) { | |
995 | overlap_check_template = QCOW2_OL_CACHED; | |
996 | } else if (!strcmp(opt_overlap_check, "all")) { | |
997 | overlap_check_template = QCOW2_OL_ALL; | |
998 | } else { | |
999 | error_setg(errp, "Unsupported value '%s' for qcow2 option " | |
1000 | "'overlap-check'. Allowed are any of the following: " | |
1001 | "none, constant, cached, all", opt_overlap_check); | |
1002 | ret = -EINVAL; | |
1003 | goto fail; | |
1004 | } | |
1005 | ||
ee55b173 | 1006 | r->overlap_check = 0; |
4c75d1a1 KW |
1007 | for (i = 0; i < QCOW2_OL_MAX_BITNR; i++) { |
1008 | /* overlap-check defines a template bitmask, but every flag may be | |
1009 | * overwritten through the associated boolean option */ | |
ee55b173 | 1010 | r->overlap_check |= |
4c75d1a1 KW |
1011 | qemu_opt_get_bool(opts, overlap_bool_option_names[i], |
1012 | overlap_check_template & (1 << i)) << i; | |
1013 | } | |
1014 | ||
ee55b173 KW |
1015 | r->discard_passthrough[QCOW2_DISCARD_NEVER] = false; |
1016 | r->discard_passthrough[QCOW2_DISCARD_ALWAYS] = true; | |
1017 | r->discard_passthrough[QCOW2_DISCARD_REQUEST] = | |
007dbc39 KW |
1018 | qemu_opt_get_bool(opts, QCOW2_OPT_DISCARD_REQUEST, |
1019 | flags & BDRV_O_UNMAP); | |
ee55b173 | 1020 | r->discard_passthrough[QCOW2_DISCARD_SNAPSHOT] = |
007dbc39 | 1021 | qemu_opt_get_bool(opts, QCOW2_OPT_DISCARD_SNAPSHOT, true); |
ee55b173 | 1022 | r->discard_passthrough[QCOW2_DISCARD_OTHER] = |
007dbc39 KW |
1023 | qemu_opt_get_bool(opts, QCOW2_OPT_DISCARD_OTHER, false); |
1024 | ||
b25b387f DB |
1025 | switch (s->crypt_method_header) { |
1026 | case QCOW_CRYPT_NONE: | |
1027 | if (encryptfmt) { | |
1028 | error_setg(errp, "No encryption in image header, but options " | |
1029 | "specified format '%s'", encryptfmt); | |
1030 | ret = -EINVAL; | |
1031 | goto fail; | |
1032 | } | |
1033 | break; | |
1034 | ||
1035 | case QCOW_CRYPT_AES: | |
1036 | if (encryptfmt && !g_str_equal(encryptfmt, "aes")) { | |
1037 | error_setg(errp, | |
1038 | "Header reported 'aes' encryption format but " | |
1039 | "options specify '%s'", encryptfmt); | |
1040 | ret = -EINVAL; | |
1041 | goto fail; | |
1042 | } | |
796d3239 MA |
1043 | qdict_put_str(encryptopts, "format", "qcow"); |
1044 | r->crypto_opts = block_crypto_open_opts_init(encryptopts, errp); | |
b25b387f DB |
1045 | break; |
1046 | ||
4652b8f3 DB |
1047 | case QCOW_CRYPT_LUKS: |
1048 | if (encryptfmt && !g_str_equal(encryptfmt, "luks")) { | |
1049 | error_setg(errp, | |
1050 | "Header reported 'luks' encryption format but " | |
1051 | "options specify '%s'", encryptfmt); | |
1052 | ret = -EINVAL; | |
1053 | goto fail; | |
1054 | } | |
796d3239 MA |
1055 | qdict_put_str(encryptopts, "format", "luks"); |
1056 | r->crypto_opts = block_crypto_open_opts_init(encryptopts, errp); | |
4652b8f3 DB |
1057 | break; |
1058 | ||
b25b387f DB |
1059 | default: |
1060 | error_setg(errp, "Unsupported encryption method %d", | |
1061 | s->crypt_method_header); | |
1062 | break; | |
1063 | } | |
1064 | if (s->crypt_method_header != QCOW_CRYPT_NONE && !r->crypto_opts) { | |
1065 | ret = -EINVAL; | |
1066 | goto fail; | |
1067 | } | |
1068 | ||
4c75d1a1 KW |
1069 | ret = 0; |
1070 | fail: | |
cb3e7f08 | 1071 | qobject_unref(encryptopts); |
94edf3fb KW |
1072 | qemu_opts_del(opts); |
1073 | opts = NULL; | |
ee55b173 KW |
1074 | return ret; |
1075 | } | |
1076 | ||
1077 | static void qcow2_update_options_commit(BlockDriverState *bs, | |
1078 | Qcow2ReopenState *r) | |
1079 | { | |
1080 | BDRVQcow2State *s = bs->opaque; | |
1081 | int i; | |
1082 | ||
5b0959a7 | 1083 | if (s->l2_table_cache) { |
e64d4072 | 1084 | qcow2_cache_destroy(s->l2_table_cache); |
5b0959a7 KW |
1085 | } |
1086 | if (s->refcount_block_cache) { | |
e64d4072 | 1087 | qcow2_cache_destroy(s->refcount_block_cache); |
5b0959a7 | 1088 | } |
ee55b173 KW |
1089 | s->l2_table_cache = r->l2_table_cache; |
1090 | s->refcount_block_cache = r->refcount_block_cache; | |
3c2e511a | 1091 | s->l2_slice_size = r->l2_slice_size; |
ee55b173 KW |
1092 | |
1093 | s->overlap_check = r->overlap_check; | |
1094 | s->use_lazy_refcounts = r->use_lazy_refcounts; | |
1095 | ||
1096 | for (i = 0; i < QCOW2_DISCARD_MAX; i++) { | |
1097 | s->discard_passthrough[i] = r->discard_passthrough[i]; | |
1098 | } | |
1099 | ||
5b0959a7 KW |
1100 | if (s->cache_clean_interval != r->cache_clean_interval) { |
1101 | cache_clean_timer_del(bs); | |
1102 | s->cache_clean_interval = r->cache_clean_interval; | |
1103 | cache_clean_timer_init(bs, bdrv_get_aio_context(bs)); | |
1104 | } | |
b25b387f DB |
1105 | |
1106 | qapi_free_QCryptoBlockOpenOptions(s->crypto_opts); | |
1107 | s->crypto_opts = r->crypto_opts; | |
ee55b173 KW |
1108 | } |
1109 | ||
1110 | static void qcow2_update_options_abort(BlockDriverState *bs, | |
1111 | Qcow2ReopenState *r) | |
1112 | { | |
1113 | if (r->l2_table_cache) { | |
e64d4072 | 1114 | qcow2_cache_destroy(r->l2_table_cache); |
ee55b173 KW |
1115 | } |
1116 | if (r->refcount_block_cache) { | |
e64d4072 | 1117 | qcow2_cache_destroy(r->refcount_block_cache); |
ee55b173 | 1118 | } |
b25b387f | 1119 | qapi_free_QCryptoBlockOpenOptions(r->crypto_opts); |
ee55b173 KW |
1120 | } |
1121 | ||
1122 | static int qcow2_update_options(BlockDriverState *bs, QDict *options, | |
1123 | int flags, Error **errp) | |
1124 | { | |
1125 | Qcow2ReopenState r = {}; | |
1126 | int ret; | |
1127 | ||
1128 | ret = qcow2_update_options_prepare(bs, &r, options, flags, errp); | |
1129 | if (ret >= 0) { | |
1130 | qcow2_update_options_commit(bs, &r); | |
1131 | } else { | |
1132 | qcow2_update_options_abort(bs, &r); | |
1133 | } | |
94edf3fb | 1134 | |
4c75d1a1 KW |
1135 | return ret; |
1136 | } | |
1137 | ||
1fafcd93 PB |
1138 | /* Called with s->lock held. */ |
1139 | static int coroutine_fn qcow2_do_open(BlockDriverState *bs, QDict *options, | |
1140 | int flags, Error **errp) | |
585f8587 | 1141 | { |
ff99129a | 1142 | BDRVQcow2State *s = bs->opaque; |
6d33e8e7 KW |
1143 | unsigned int len, i; |
1144 | int ret = 0; | |
585f8587 | 1145 | QCowHeader header; |
74c4510a | 1146 | Error *local_err = NULL; |
9b80ddf3 | 1147 | uint64_t ext_end; |
2cf7cfa1 | 1148 | uint64_t l1_vm_state_index; |
88ddffae | 1149 | bool update_header = false; |
605bc8be | 1150 | bool header_updated = false; |
585f8587 | 1151 | |
cf2ab8fc | 1152 | ret = bdrv_pread(bs->file, 0, &header, sizeof(header)); |
6d85a57e | 1153 | if (ret < 0) { |
3ef6c40a | 1154 | error_setg_errno(errp, -ret, "Could not read qcow2 header"); |
585f8587 | 1155 | goto fail; |
6d85a57e | 1156 | } |
585f8587 FB |
1157 | be32_to_cpus(&header.magic); |
1158 | be32_to_cpus(&header.version); | |
1159 | be64_to_cpus(&header.backing_file_offset); | |
1160 | be32_to_cpus(&header.backing_file_size); | |
1161 | be64_to_cpus(&header.size); | |
1162 | be32_to_cpus(&header.cluster_bits); | |
1163 | be32_to_cpus(&header.crypt_method); | |
1164 | be64_to_cpus(&header.l1_table_offset); | |
1165 | be32_to_cpus(&header.l1_size); | |
1166 | be64_to_cpus(&header.refcount_table_offset); | |
1167 | be32_to_cpus(&header.refcount_table_clusters); | |
1168 | be64_to_cpus(&header.snapshots_offset); | |
1169 | be32_to_cpus(&header.nb_snapshots); | |
3b46e624 | 1170 | |
e8cdcec1 | 1171 | if (header.magic != QCOW_MAGIC) { |
3ef6c40a | 1172 | error_setg(errp, "Image is not in qcow2 format"); |
76abe407 | 1173 | ret = -EINVAL; |
585f8587 | 1174 | goto fail; |
6d85a57e | 1175 | } |
6744cbab | 1176 | if (header.version < 2 || header.version > 3) { |
a55448b3 | 1177 | error_setg(errp, "Unsupported qcow2 version %" PRIu32, header.version); |
6744cbab KW |
1178 | ret = -ENOTSUP; |
1179 | goto fail; | |
1180 | } | |
1181 | ||
1182 | s->qcow_version = header.version; | |
1183 | ||
24342f2c KW |
1184 | /* Initialise cluster size */ |
1185 | if (header.cluster_bits < MIN_CLUSTER_BITS || | |
1186 | header.cluster_bits > MAX_CLUSTER_BITS) { | |
521b2b5d HR |
1187 | error_setg(errp, "Unsupported cluster size: 2^%" PRIu32, |
1188 | header.cluster_bits); | |
24342f2c KW |
1189 | ret = -EINVAL; |
1190 | goto fail; | |
1191 | } | |
1192 | ||
1193 | s->cluster_bits = header.cluster_bits; | |
1194 | s->cluster_size = 1 << s->cluster_bits; | |
a35f87f5 | 1195 | s->cluster_sectors = 1 << (s->cluster_bits - BDRV_SECTOR_BITS); |
24342f2c | 1196 | |
6744cbab KW |
1197 | /* Initialise version 3 header fields */ |
1198 | if (header.version == 2) { | |
1199 | header.incompatible_features = 0; | |
1200 | header.compatible_features = 0; | |
1201 | header.autoclear_features = 0; | |
1202 | header.refcount_order = 4; | |
1203 | header.header_length = 72; | |
1204 | } else { | |
1205 | be64_to_cpus(&header.incompatible_features); | |
1206 | be64_to_cpus(&header.compatible_features); | |
1207 | be64_to_cpus(&header.autoclear_features); | |
1208 | be32_to_cpus(&header.refcount_order); | |
1209 | be32_to_cpus(&header.header_length); | |
24342f2c KW |
1210 | |
1211 | if (header.header_length < 104) { | |
1212 | error_setg(errp, "qcow2 header too short"); | |
1213 | ret = -EINVAL; | |
1214 | goto fail; | |
1215 | } | |
1216 | } | |
1217 | ||
1218 | if (header.header_length > s->cluster_size) { | |
1219 | error_setg(errp, "qcow2 header exceeds cluster size"); | |
1220 | ret = -EINVAL; | |
1221 | goto fail; | |
6744cbab KW |
1222 | } |
1223 | ||
1224 | if (header.header_length > sizeof(header)) { | |
1225 | s->unknown_header_fields_size = header.header_length - sizeof(header); | |
1226 | s->unknown_header_fields = g_malloc(s->unknown_header_fields_size); | |
cf2ab8fc | 1227 | ret = bdrv_pread(bs->file, sizeof(header), s->unknown_header_fields, |
6744cbab KW |
1228 | s->unknown_header_fields_size); |
1229 | if (ret < 0) { | |
3ef6c40a HR |
1230 | error_setg_errno(errp, -ret, "Could not read unknown qcow2 header " |
1231 | "fields"); | |
6744cbab KW |
1232 | goto fail; |
1233 | } | |
1234 | } | |
1235 | ||
a1b3955c KW |
1236 | if (header.backing_file_offset > s->cluster_size) { |
1237 | error_setg(errp, "Invalid backing file offset"); | |
1238 | ret = -EINVAL; | |
1239 | goto fail; | |
1240 | } | |
1241 | ||
cfcc4c62 KW |
1242 | if (header.backing_file_offset) { |
1243 | ext_end = header.backing_file_offset; | |
1244 | } else { | |
1245 | ext_end = 1 << header.cluster_bits; | |
1246 | } | |
1247 | ||
6744cbab KW |
1248 | /* Handle feature bits */ |
1249 | s->incompatible_features = header.incompatible_features; | |
1250 | s->compatible_features = header.compatible_features; | |
1251 | s->autoclear_features = header.autoclear_features; | |
1252 | ||
c61d0004 | 1253 | if (s->incompatible_features & ~QCOW2_INCOMPAT_MASK) { |
cfcc4c62 KW |
1254 | void *feature_table = NULL; |
1255 | qcow2_read_extensions(bs, header.header_length, ext_end, | |
88ddffae | 1256 | &feature_table, flags, NULL, NULL); |
a55448b3 | 1257 | report_unsupported_feature(errp, feature_table, |
c61d0004 SH |
1258 | s->incompatible_features & |
1259 | ~QCOW2_INCOMPAT_MASK); | |
6744cbab | 1260 | ret = -ENOTSUP; |
c5a33ee9 | 1261 | g_free(feature_table); |
6744cbab KW |
1262 | goto fail; |
1263 | } | |
1264 | ||
69c98726 HR |
1265 | if (s->incompatible_features & QCOW2_INCOMPAT_CORRUPT) { |
1266 | /* Corrupt images may not be written to unless they are being repaired | |
1267 | */ | |
1268 | if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_CHECK)) { | |
3ef6c40a HR |
1269 | error_setg(errp, "qcow2: Image is corrupt; cannot be opened " |
1270 | "read/write"); | |
69c98726 HR |
1271 | ret = -EACCES; |
1272 | goto fail; | |
1273 | } | |
1274 | } | |
1275 | ||
6744cbab | 1276 | /* Check support for various header values */ |
b72faf9f HR |
1277 | if (header.refcount_order > 6) { |
1278 | error_setg(errp, "Reference count entry width too large; may not " | |
1279 | "exceed 64 bits"); | |
1280 | ret = -EINVAL; | |
e8cdcec1 KW |
1281 | goto fail; |
1282 | } | |
b6481f37 | 1283 | s->refcount_order = header.refcount_order; |
346a53df HR |
1284 | s->refcount_bits = 1 << s->refcount_order; |
1285 | s->refcount_max = UINT64_C(1) << (s->refcount_bits - 1); | |
1286 | s->refcount_max += s->refcount_max - 1; | |
6744cbab | 1287 | |
585f8587 | 1288 | s->crypt_method_header = header.crypt_method; |
6d85a57e | 1289 | if (s->crypt_method_header) { |
e6ff69bf DB |
1290 | if (bdrv_uses_whitelist() && |
1291 | s->crypt_method_header == QCOW_CRYPT_AES) { | |
8c0dcbc4 DB |
1292 | error_setg(errp, |
1293 | "Use of AES-CBC encrypted qcow2 images is no longer " | |
1294 | "supported in system emulators"); | |
1295 | error_append_hint(errp, | |
1296 | "You can use 'qemu-img convert' to convert your " | |
1297 | "image to an alternative supported format, such " | |
1298 | "as unencrypted qcow2, or raw with the LUKS " | |
1299 | "format instead.\n"); | |
1300 | ret = -ENOSYS; | |
1301 | goto fail; | |
e6ff69bf DB |
1302 | } |
1303 | ||
4652b8f3 DB |
1304 | if (s->crypt_method_header == QCOW_CRYPT_AES) { |
1305 | s->crypt_physical_offset = false; | |
1306 | } else { | |
1307 | /* Assuming LUKS and any future crypt methods we | |
1308 | * add will all use physical offsets, due to the | |
1309 | * fact that the alternative is insecure... */ | |
1310 | s->crypt_physical_offset = true; | |
1311 | } | |
1312 | ||
54115412 | 1313 | bs->encrypted = true; |
6d85a57e | 1314 | } |
24342f2c | 1315 | |
585f8587 FB |
1316 | s->l2_bits = s->cluster_bits - 3; /* L2 is always one cluster */ |
1317 | s->l2_size = 1 << s->l2_bits; | |
1d13d654 HR |
1318 | /* 2^(s->refcount_order - 3) is the refcount width in bytes */ |
1319 | s->refcount_block_bits = s->cluster_bits - (s->refcount_order - 3); | |
1320 | s->refcount_block_size = 1 << s->refcount_block_bits; | |
585f8587 FB |
1321 | bs->total_sectors = header.size / 512; |
1322 | s->csize_shift = (62 - (s->cluster_bits - 8)); | |
1323 | s->csize_mask = (1 << (s->cluster_bits - 8)) - 1; | |
1324 | s->cluster_offset_mask = (1LL << s->csize_shift) - 1; | |
5dab2fad | 1325 | |
585f8587 | 1326 | s->refcount_table_offset = header.refcount_table_offset; |
5fafdf24 | 1327 | s->refcount_table_size = |
585f8587 FB |
1328 | header.refcount_table_clusters << (s->cluster_bits - 3); |
1329 | ||
951053a9 AG |
1330 | if (header.refcount_table_clusters == 0 && !(flags & BDRV_O_CHECK)) { |
1331 | error_setg(errp, "Image does not contain a reference count table"); | |
1332 | ret = -EINVAL; | |
1333 | goto fail; | |
1334 | } | |
1335 | ||
0cf0e598 AG |
1336 | ret = qcow2_validate_table(bs, s->refcount_table_offset, |
1337 | header.refcount_table_clusters, | |
1338 | s->cluster_size, QCOW_MAX_REFTABLE_SIZE, | |
1339 | "Reference count table", errp); | |
8c7de283 | 1340 | if (ret < 0) { |
8c7de283 KW |
1341 | goto fail; |
1342 | } | |
1343 | ||
0cf0e598 AG |
1344 | /* The total size in bytes of the snapshot table is checked in |
1345 | * qcow2_read_snapshots() because the size of each snapshot is | |
1346 | * variable and we don't know it yet. | |
1347 | * Here we only check the offset and number of snapshots. */ | |
1348 | ret = qcow2_validate_table(bs, header.snapshots_offset, | |
1349 | header.nb_snapshots, | |
1350 | sizeof(QCowSnapshotHeader), | |
1351 | sizeof(QCowSnapshotHeader) * QCOW_MAX_SNAPSHOTS, | |
1352 | "Snapshot table", errp); | |
ce48f2f4 | 1353 | if (ret < 0) { |
ce48f2f4 KW |
1354 | goto fail; |
1355 | } | |
1356 | ||
585f8587 | 1357 | /* read the level 1 table */ |
0cf0e598 AG |
1358 | ret = qcow2_validate_table(bs, header.l1_table_offset, |
1359 | header.l1_size, sizeof(uint64_t), | |
1360 | QCOW_MAX_L1_SIZE, "Active L1 table", errp); | |
1361 | if (ret < 0) { | |
2d51c32c KW |
1362 | goto fail; |
1363 | } | |
585f8587 | 1364 | s->l1_size = header.l1_size; |
0cf0e598 | 1365 | s->l1_table_offset = header.l1_table_offset; |
2cf7cfa1 KW |
1366 | |
1367 | l1_vm_state_index = size_to_l1(s, header.size); | |
1368 | if (l1_vm_state_index > INT_MAX) { | |
3ef6c40a | 1369 | error_setg(errp, "Image is too big"); |
2cf7cfa1 KW |
1370 | ret = -EFBIG; |
1371 | goto fail; | |
1372 | } | |
1373 | s->l1_vm_state_index = l1_vm_state_index; | |
1374 | ||
585f8587 FB |
1375 | /* the L1 table must contain at least enough entries to put |
1376 | header.size bytes */ | |
6d85a57e | 1377 | if (s->l1_size < s->l1_vm_state_index) { |
3ef6c40a | 1378 | error_setg(errp, "L1 table is too small"); |
6d85a57e | 1379 | ret = -EINVAL; |
585f8587 | 1380 | goto fail; |
6d85a57e | 1381 | } |
2d51c32c | 1382 | |
d191d12d | 1383 | if (s->l1_size > 0) { |
9a4f4c31 | 1384 | s->l1_table = qemu_try_blockalign(bs->file->bs, |
9e029689 | 1385 | ROUND_UP(s->l1_size * sizeof(uint64_t), 512)); |
de82815d KW |
1386 | if (s->l1_table == NULL) { |
1387 | error_setg(errp, "Could not allocate L1 table"); | |
1388 | ret = -ENOMEM; | |
1389 | goto fail; | |
1390 | } | |
cf2ab8fc | 1391 | ret = bdrv_pread(bs->file, s->l1_table_offset, s->l1_table, |
6d85a57e JS |
1392 | s->l1_size * sizeof(uint64_t)); |
1393 | if (ret < 0) { | |
3ef6c40a | 1394 | error_setg_errno(errp, -ret, "Could not read L1 table"); |
d191d12d | 1395 | goto fail; |
6d85a57e | 1396 | } |
d191d12d SW |
1397 | for(i = 0;i < s->l1_size; i++) { |
1398 | be64_to_cpus(&s->l1_table[i]); | |
1399 | } | |
585f8587 | 1400 | } |
29c1a730 | 1401 | |
94edf3fb KW |
1402 | /* Parse driver-specific options */ |
1403 | ret = qcow2_update_options(bs, options, flags, errp); | |
90efa0ea KW |
1404 | if (ret < 0) { |
1405 | goto fail; | |
1406 | } | |
1407 | ||
585f8587 | 1408 | s->cluster_cache_offset = -1; |
06d9260f | 1409 | s->flags = flags; |
3b46e624 | 1410 | |
6d85a57e JS |
1411 | ret = qcow2_refcount_init(bs); |
1412 | if (ret != 0) { | |
3ef6c40a | 1413 | error_setg_errno(errp, -ret, "Could not initialize refcount handling"); |
585f8587 | 1414 | goto fail; |
6d85a57e | 1415 | } |
585f8587 | 1416 | |
72cf2d4f | 1417 | QLIST_INIT(&s->cluster_allocs); |
0b919fae | 1418 | QTAILQ_INIT(&s->discards); |
f214978a | 1419 | |
9b80ddf3 | 1420 | /* read qcow2 extensions */ |
3ef6c40a | 1421 | if (qcow2_read_extensions(bs, header.header_length, ext_end, NULL, |
88ddffae | 1422 | flags, &update_header, &local_err)) { |
3ef6c40a | 1423 | error_propagate(errp, local_err); |
6d85a57e | 1424 | ret = -EINVAL; |
9b80ddf3 | 1425 | goto fail; |
6d85a57e | 1426 | } |
9b80ddf3 | 1427 | |
4652b8f3 DB |
1428 | /* qcow2_read_extension may have set up the crypto context |
1429 | * if the crypt method needs a header region, some methods | |
1430 | * don't need header extensions, so must check here | |
1431 | */ | |
1432 | if (s->crypt_method_header && !s->crypto) { | |
1433 | if (s->crypt_method_header == QCOW_CRYPT_AES) { | |
1434 | unsigned int cflags = 0; | |
1435 | if (flags & BDRV_O_NO_IO) { | |
1436 | cflags |= QCRYPTO_BLOCK_OPEN_NO_IO; | |
1437 | } | |
1cd9a787 DB |
1438 | s->crypto = qcrypto_block_open(s->crypto_opts, "encrypt.", |
1439 | NULL, NULL, cflags, errp); | |
4652b8f3 DB |
1440 | if (!s->crypto) { |
1441 | ret = -EINVAL; | |
1442 | goto fail; | |
1443 | } | |
1444 | } else if (!(flags & BDRV_O_NO_IO)) { | |
1445 | error_setg(errp, "Missing CRYPTO header for crypt method %d", | |
1446 | s->crypt_method_header); | |
b25b387f DB |
1447 | ret = -EINVAL; |
1448 | goto fail; | |
1449 | } | |
1450 | } | |
1451 | ||
585f8587 FB |
1452 | /* read the backing file name */ |
1453 | if (header.backing_file_offset != 0) { | |
1454 | len = header.backing_file_size; | |
9a29e18f | 1455 | if (len > MIN(1023, s->cluster_size - header.backing_file_offset) || |
e729fa6a | 1456 | len >= sizeof(bs->backing_file)) { |
6d33e8e7 KW |
1457 | error_setg(errp, "Backing file name too long"); |
1458 | ret = -EINVAL; | |
1459 | goto fail; | |
6d85a57e | 1460 | } |
cf2ab8fc | 1461 | ret = bdrv_pread(bs->file, header.backing_file_offset, |
6d85a57e JS |
1462 | bs->backing_file, len); |
1463 | if (ret < 0) { | |
3ef6c40a | 1464 | error_setg_errno(errp, -ret, "Could not read backing file name"); |
585f8587 | 1465 | goto fail; |
6d85a57e | 1466 | } |
585f8587 | 1467 | bs->backing_file[len] = '\0'; |
e4603fe1 | 1468 | s->image_backing_file = g_strdup(bs->backing_file); |
585f8587 | 1469 | } |
42deb29f | 1470 | |
11b128f4 KW |
1471 | /* Internal snapshots */ |
1472 | s->snapshots_offset = header.snapshots_offset; | |
1473 | s->nb_snapshots = header.nb_snapshots; | |
1474 | ||
42deb29f KW |
1475 | ret = qcow2_read_snapshots(bs); |
1476 | if (ret < 0) { | |
3ef6c40a | 1477 | error_setg_errno(errp, -ret, "Could not read snapshots"); |
585f8587 | 1478 | goto fail; |
6d85a57e | 1479 | } |
585f8587 | 1480 | |
af7b708d | 1481 | /* Clear unknown autoclear feature bits */ |
88ddffae | 1482 | update_header |= s->autoclear_features & ~QCOW2_AUTOCLEAR_MASK; |
d1258dd0 VSO |
1483 | update_header = |
1484 | update_header && !bs->read_only && !(flags & BDRV_O_INACTIVE); | |
1485 | if (update_header) { | |
88ddffae | 1486 | s->autoclear_features &= QCOW2_AUTOCLEAR_MASK; |
d1258dd0 VSO |
1487 | } |
1488 | ||
605bc8be VSO |
1489 | if (s->dirty_bitmaps_loaded) { |
1490 | /* It's some kind of reopen. There are no known cases where we need to | |
1491 | * reload bitmaps in such a situation, so it's safer to skip them. | |
2d949dfc VSO |
1492 | * |
1493 | * Moreover, if we have some readonly bitmaps and we are reopening for | |
1494 | * rw we should reopen bitmaps correspondingly. | |
1495 | */ | |
1496 | if (bdrv_has_readonly_bitmaps(bs) && | |
1497 | !bdrv_is_read_only(bs) && !(bdrv_get_flags(bs) & BDRV_O_INACTIVE)) | |
1498 | { | |
2d949dfc | 1499 | qcow2_reopen_bitmaps_rw_hint(bs, &header_updated, &local_err); |
2d949dfc | 1500 | } |
605bc8be VSO |
1501 | } else { |
1502 | header_updated = qcow2_load_dirty_bitmaps(bs, &local_err); | |
1503 | s->dirty_bitmaps_loaded = true; | |
d1258dd0 | 1504 | } |
605bc8be | 1505 | update_header = update_header && !header_updated; |
d1258dd0 VSO |
1506 | if (local_err != NULL) { |
1507 | error_propagate(errp, local_err); | |
1508 | ret = -EINVAL; | |
1509 | goto fail; | |
1510 | } | |
1511 | ||
1512 | if (update_header) { | |
af7b708d SH |
1513 | ret = qcow2_update_header(bs); |
1514 | if (ret < 0) { | |
3ef6c40a | 1515 | error_setg_errno(errp, -ret, "Could not update qcow2 header"); |
af7b708d SH |
1516 | goto fail; |
1517 | } | |
1518 | } | |
1519 | ||
e24d813b | 1520 | bs->supported_zero_flags = header.version >= 3 ? BDRV_REQ_MAY_UNMAP : 0; |
68d100e9 | 1521 | |
c61d0004 | 1522 | /* Repair image if dirty */ |
04c01a5c | 1523 | if (!(flags & (BDRV_O_CHECK | BDRV_O_INACTIVE)) && !bs->read_only && |
058f8f16 | 1524 | (s->incompatible_features & QCOW2_INCOMPAT_DIRTY)) { |
c61d0004 SH |
1525 | BdrvCheckResult result = {0}; |
1526 | ||
2fd61638 PB |
1527 | ret = qcow2_co_check_locked(bs, &result, |
1528 | BDRV_FIX_ERRORS | BDRV_FIX_LEAKS); | |
791fff50 HR |
1529 | if (ret < 0 || result.check_errors) { |
1530 | if (ret >= 0) { | |
1531 | ret = -EIO; | |
1532 | } | |
3ef6c40a | 1533 | error_setg_errno(errp, -ret, "Could not repair dirty image"); |
c61d0004 SH |
1534 | goto fail; |
1535 | } | |
1536 | } | |
1537 | ||
585f8587 | 1538 | #ifdef DEBUG_ALLOC |
6cbc3031 PH |
1539 | { |
1540 | BdrvCheckResult result = {0}; | |
b35278f7 | 1541 | qcow2_check_refcounts(bs, &result, 0); |
6cbc3031 | 1542 | } |
585f8587 | 1543 | #endif |
6d85a57e | 1544 | return ret; |
585f8587 FB |
1545 | |
1546 | fail: | |
6744cbab | 1547 | g_free(s->unknown_header_fields); |
75bab85c | 1548 | cleanup_unknown_header_ext(bs); |
ed6ccf0f KW |
1549 | qcow2_free_snapshots(bs); |
1550 | qcow2_refcount_close(bs); | |
de82815d | 1551 | qemu_vfree(s->l1_table); |
cf93980e HR |
1552 | /* else pre-write overlap checks in cache_destroy may crash */ |
1553 | s->l1_table = NULL; | |
279621c0 | 1554 | cache_clean_timer_del(bs); |
29c1a730 | 1555 | if (s->l2_table_cache) { |
e64d4072 | 1556 | qcow2_cache_destroy(s->l2_table_cache); |
29c1a730 | 1557 | } |
c5a33ee9 | 1558 | if (s->refcount_block_cache) { |
e64d4072 | 1559 | qcow2_cache_destroy(s->refcount_block_cache); |
c5a33ee9 | 1560 | } |
b25b387f DB |
1561 | qcrypto_block_free(s->crypto); |
1562 | qapi_free_QCryptoBlockOpenOptions(s->crypto_opts); | |
6d85a57e | 1563 | return ret; |
585f8587 FB |
1564 | } |
1565 | ||
1fafcd93 PB |
1566 | typedef struct QCow2OpenCo { |
1567 | BlockDriverState *bs; | |
1568 | QDict *options; | |
1569 | int flags; | |
1570 | Error **errp; | |
1571 | int ret; | |
1572 | } QCow2OpenCo; | |
1573 | ||
1574 | static void coroutine_fn qcow2_open_entry(void *opaque) | |
1575 | { | |
1576 | QCow2OpenCo *qoc = opaque; | |
1577 | BDRVQcow2State *s = qoc->bs->opaque; | |
1578 | ||
1579 | qemu_co_mutex_lock(&s->lock); | |
1580 | qoc->ret = qcow2_do_open(qoc->bs, qoc->options, qoc->flags, qoc->errp); | |
1581 | qemu_co_mutex_unlock(&s->lock); | |
1582 | } | |
1583 | ||
4e4bf5c4 KW |
1584 | static int qcow2_open(BlockDriverState *bs, QDict *options, int flags, |
1585 | Error **errp) | |
1586 | { | |
1fafcd93 PB |
1587 | BDRVQcow2State *s = bs->opaque; |
1588 | QCow2OpenCo qoc = { | |
1589 | .bs = bs, | |
1590 | .options = options, | |
1591 | .flags = flags, | |
1592 | .errp = errp, | |
1593 | .ret = -EINPROGRESS | |
1594 | }; | |
1595 | ||
4e4bf5c4 KW |
1596 | bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file, |
1597 | false, errp); | |
1598 | if (!bs->file) { | |
1599 | return -EINVAL; | |
1600 | } | |
1601 | ||
1fafcd93 PB |
1602 | /* Initialise locks */ |
1603 | qemu_co_mutex_init(&s->lock); | |
1604 | ||
1605 | if (qemu_in_coroutine()) { | |
1606 | /* From bdrv_co_create. */ | |
1607 | qcow2_open_entry(&qoc); | |
1608 | } else { | |
1609 | qemu_coroutine_enter(qemu_coroutine_create(qcow2_open_entry, &qoc)); | |
1610 | BDRV_POLL_WHILE(bs, qoc.ret == -EINPROGRESS); | |
1611 | } | |
1612 | return qoc.ret; | |
4e4bf5c4 KW |
1613 | } |
1614 | ||
3baca891 | 1615 | static void qcow2_refresh_limits(BlockDriverState *bs, Error **errp) |
d34682cd | 1616 | { |
ff99129a | 1617 | BDRVQcow2State *s = bs->opaque; |
d34682cd | 1618 | |
a84178cc EB |
1619 | if (bs->encrypted) { |
1620 | /* Encryption works on a sector granularity */ | |
a5b8dd2c | 1621 | bs->bl.request_alignment = BDRV_SECTOR_SIZE; |
a84178cc | 1622 | } |
cf081fca | 1623 | bs->bl.pwrite_zeroes_alignment = s->cluster_size; |
ecdbead6 | 1624 | bs->bl.pdiscard_alignment = s->cluster_size; |
d34682cd KW |
1625 | } |
1626 | ||
21d82ac9 JC |
1627 | static int qcow2_reopen_prepare(BDRVReopenState *state, |
1628 | BlockReopenQueue *queue, Error **errp) | |
1629 | { | |
5b0959a7 | 1630 | Qcow2ReopenState *r; |
4c2e5f8f KW |
1631 | int ret; |
1632 | ||
5b0959a7 KW |
1633 | r = g_new0(Qcow2ReopenState, 1); |
1634 | state->opaque = r; | |
1635 | ||
1636 | ret = qcow2_update_options_prepare(state->bs, r, state->options, | |
1637 | state->flags, errp); | |
1638 | if (ret < 0) { | |
1639 | goto fail; | |
1640 | } | |
1641 | ||
1642 | /* We need to write out any unwritten data if we reopen read-only. */ | |
4c2e5f8f | 1643 | if ((state->flags & BDRV_O_RDWR) == 0) { |
169b8793 VSO |
1644 | ret = qcow2_reopen_bitmaps_ro(state->bs, errp); |
1645 | if (ret < 0) { | |
1646 | goto fail; | |
1647 | } | |
1648 | ||
4c2e5f8f KW |
1649 | ret = bdrv_flush(state->bs); |
1650 | if (ret < 0) { | |
5b0959a7 | 1651 | goto fail; |
4c2e5f8f KW |
1652 | } |
1653 | ||
1654 | ret = qcow2_mark_clean(state->bs); | |
1655 | if (ret < 0) { | |
5b0959a7 | 1656 | goto fail; |
4c2e5f8f KW |
1657 | } |
1658 | } | |
1659 | ||
21d82ac9 | 1660 | return 0; |
5b0959a7 KW |
1661 | |
1662 | fail: | |
1663 | qcow2_update_options_abort(state->bs, r); | |
1664 | g_free(r); | |
1665 | return ret; | |
1666 | } | |
1667 | ||
1668 | static void qcow2_reopen_commit(BDRVReopenState *state) | |
1669 | { | |
1670 | qcow2_update_options_commit(state->bs, state->opaque); | |
1671 | g_free(state->opaque); | |
1672 | } | |
1673 | ||
1674 | static void qcow2_reopen_abort(BDRVReopenState *state) | |
1675 | { | |
1676 | qcow2_update_options_abort(state->bs, state->opaque); | |
1677 | g_free(state->opaque); | |
21d82ac9 JC |
1678 | } |
1679 | ||
5365f44d KW |
1680 | static void qcow2_join_options(QDict *options, QDict *old_options) |
1681 | { | |
1682 | bool has_new_overlap_template = | |
1683 | qdict_haskey(options, QCOW2_OPT_OVERLAP) || | |
1684 | qdict_haskey(options, QCOW2_OPT_OVERLAP_TEMPLATE); | |
1685 | bool has_new_total_cache_size = | |
1686 | qdict_haskey(options, QCOW2_OPT_CACHE_SIZE); | |
1687 | bool has_all_cache_options; | |
1688 | ||
1689 | /* New overlap template overrides all old overlap options */ | |
1690 | if (has_new_overlap_template) { | |
1691 | qdict_del(old_options, QCOW2_OPT_OVERLAP); | |
1692 | qdict_del(old_options, QCOW2_OPT_OVERLAP_TEMPLATE); | |
1693 | qdict_del(old_options, QCOW2_OPT_OVERLAP_MAIN_HEADER); | |
1694 | qdict_del(old_options, QCOW2_OPT_OVERLAP_ACTIVE_L1); | |
1695 | qdict_del(old_options, QCOW2_OPT_OVERLAP_ACTIVE_L2); | |
1696 | qdict_del(old_options, QCOW2_OPT_OVERLAP_REFCOUNT_TABLE); | |
1697 | qdict_del(old_options, QCOW2_OPT_OVERLAP_REFCOUNT_BLOCK); | |
1698 | qdict_del(old_options, QCOW2_OPT_OVERLAP_SNAPSHOT_TABLE); | |
1699 | qdict_del(old_options, QCOW2_OPT_OVERLAP_INACTIVE_L1); | |
1700 | qdict_del(old_options, QCOW2_OPT_OVERLAP_INACTIVE_L2); | |
1701 | } | |
1702 | ||
1703 | /* New total cache size overrides all old options */ | |
1704 | if (qdict_haskey(options, QCOW2_OPT_CACHE_SIZE)) { | |
1705 | qdict_del(old_options, QCOW2_OPT_L2_CACHE_SIZE); | |
1706 | qdict_del(old_options, QCOW2_OPT_REFCOUNT_CACHE_SIZE); | |
1707 | } | |
1708 | ||
1709 | qdict_join(options, old_options, false); | |
1710 | ||
1711 | /* | |
1712 | * If after merging all cache size options are set, an old total size is | |
1713 | * overwritten. Do keep all options, however, if all three are new. The | |
1714 | * resulting error message is what we want to happen. | |
1715 | */ | |
1716 | has_all_cache_options = | |
1717 | qdict_haskey(options, QCOW2_OPT_CACHE_SIZE) || | |
1718 | qdict_haskey(options, QCOW2_OPT_L2_CACHE_SIZE) || | |
1719 | qdict_haskey(options, QCOW2_OPT_REFCOUNT_CACHE_SIZE); | |
1720 | ||
1721 | if (has_all_cache_options && !has_new_total_cache_size) { | |
1722 | qdict_del(options, QCOW2_OPT_CACHE_SIZE); | |
1723 | } | |
1724 | } | |
1725 | ||
a320fb04 EB |
1726 | static int coroutine_fn qcow2_co_block_status(BlockDriverState *bs, |
1727 | bool want_zero, | |
1728 | int64_t offset, int64_t count, | |
1729 | int64_t *pnum, int64_t *map, | |
1730 | BlockDriverState **file) | |
585f8587 | 1731 | { |
ff99129a | 1732 | BDRVQcow2State *s = bs->opaque; |
585f8587 | 1733 | uint64_t cluster_offset; |
4bc74be9 | 1734 | int index_in_cluster, ret; |
ecfe1863 | 1735 | unsigned int bytes; |
a320fb04 | 1736 | int status = 0; |
585f8587 | 1737 | |
a320fb04 | 1738 | bytes = MIN(INT_MAX, count); |
f8a2e5e3 | 1739 | qemu_co_mutex_lock(&s->lock); |
a320fb04 | 1740 | ret = qcow2_get_cluster_offset(bs, offset, &bytes, &cluster_offset); |
f8a2e5e3 | 1741 | qemu_co_mutex_unlock(&s->lock); |
1c46efaa | 1742 | if (ret < 0) { |
d663640c | 1743 | return ret; |
1c46efaa | 1744 | } |
095a9c58 | 1745 | |
a320fb04 | 1746 | *pnum = bytes; |
ecfe1863 | 1747 | |
4bc74be9 | 1748 | if (cluster_offset != 0 && ret != QCOW2_CLUSTER_COMPRESSED && |
b25b387f | 1749 | !s->crypto) { |
a320fb04 EB |
1750 | index_in_cluster = offset & (s->cluster_size - 1); |
1751 | *map = cluster_offset | index_in_cluster; | |
178b4db7 | 1752 | *file = bs->file->bs; |
a320fb04 | 1753 | status |= BDRV_BLOCK_OFFSET_VALID; |
4bc74be9 | 1754 | } |
fdfab37d | 1755 | if (ret == QCOW2_CLUSTER_ZERO_PLAIN || ret == QCOW2_CLUSTER_ZERO_ALLOC) { |
4bc74be9 PB |
1756 | status |= BDRV_BLOCK_ZERO; |
1757 | } else if (ret != QCOW2_CLUSTER_UNALLOCATED) { | |
1758 | status |= BDRV_BLOCK_DATA; | |
1759 | } | |
1760 | return status; | |
585f8587 FB |
1761 | } |
1762 | ||
fd9fcd37 FZ |
1763 | static coroutine_fn int qcow2_handle_l2meta(BlockDriverState *bs, |
1764 | QCowL2Meta **pl2meta, | |
1765 | bool link_l2) | |
1766 | { | |
1767 | int ret = 0; | |
1768 | QCowL2Meta *l2meta = *pl2meta; | |
1769 | ||
1770 | while (l2meta != NULL) { | |
1771 | QCowL2Meta *next; | |
1772 | ||
354d930d | 1773 | if (link_l2) { |
fd9fcd37 FZ |
1774 | ret = qcow2_alloc_cluster_link_l2(bs, l2meta); |
1775 | if (ret) { | |
1776 | goto out; | |
1777 | } | |
8b24cd14 KW |
1778 | } else { |
1779 | qcow2_alloc_cluster_abort(bs, l2meta); | |
fd9fcd37 FZ |
1780 | } |
1781 | ||
1782 | /* Take the request off the list of running requests */ | |
1783 | if (l2meta->nb_clusters != 0) { | |
1784 | QLIST_REMOVE(l2meta, next_in_flight); | |
1785 | } | |
1786 | ||
1787 | qemu_co_queue_restart_all(&l2meta->dependent_requests); | |
1788 | ||
1789 | next = l2meta->next; | |
1790 | g_free(l2meta); | |
1791 | l2meta = next; | |
1792 | } | |
1793 | out: | |
1794 | *pl2meta = l2meta; | |
1795 | return ret; | |
1796 | } | |
1797 | ||
ecfe1863 KW |
1798 | static coroutine_fn int qcow2_co_preadv(BlockDriverState *bs, uint64_t offset, |
1799 | uint64_t bytes, QEMUIOVector *qiov, | |
1800 | int flags) | |
585f8587 | 1801 | { |
ff99129a | 1802 | BDRVQcow2State *s = bs->opaque; |
546a7dc4 | 1803 | int offset_in_cluster; |
68d100e9 | 1804 | int ret; |
ecfe1863 | 1805 | unsigned int cur_bytes; /* number of bytes in current iteration */ |
c2bdd990 | 1806 | uint64_t cluster_offset = 0; |
3fc48d09 FZ |
1807 | uint64_t bytes_done = 0; |
1808 | QEMUIOVector hd_qiov; | |
1809 | uint8_t *cluster_data = NULL; | |
585f8587 | 1810 | |
3fc48d09 FZ |
1811 | qemu_iovec_init(&hd_qiov, qiov->niov); |
1812 | ||
1813 | qemu_co_mutex_lock(&s->lock); | |
1814 | ||
ecfe1863 | 1815 | while (bytes != 0) { |
bd28f835 | 1816 | |
5ebaa27e | 1817 | /* prepare next request */ |
ecfe1863 | 1818 | cur_bytes = MIN(bytes, INT_MAX); |
b25b387f | 1819 | if (s->crypto) { |
ecfe1863 KW |
1820 | cur_bytes = MIN(cur_bytes, |
1821 | QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size); | |
585f8587 | 1822 | } |
5ebaa27e | 1823 | |
ecfe1863 | 1824 | ret = qcow2_get_cluster_offset(bs, offset, &cur_bytes, &cluster_offset); |
8af36488 | 1825 | if (ret < 0) { |
3fc48d09 | 1826 | goto fail; |
8af36488 | 1827 | } |
bd28f835 | 1828 | |
ecfe1863 | 1829 | offset_in_cluster = offset_into_cluster(s, offset); |
c87c0672 | 1830 | |
3fc48d09 | 1831 | qemu_iovec_reset(&hd_qiov); |
ecfe1863 | 1832 | qemu_iovec_concat(&hd_qiov, qiov, bytes_done, cur_bytes); |
5ebaa27e | 1833 | |
68d000a3 KW |
1834 | switch (ret) { |
1835 | case QCOW2_CLUSTER_UNALLOCATED: | |
5ebaa27e | 1836 | |
760e0063 | 1837 | if (bs->backing) { |
546a7dc4 EK |
1838 | BLKDBG_EVENT(bs->file, BLKDBG_READ_BACKING_AIO); |
1839 | qemu_co_mutex_unlock(&s->lock); | |
1840 | ret = bdrv_co_preadv(bs->backing, offset, cur_bytes, | |
1841 | &hd_qiov, 0); | |
1842 | qemu_co_mutex_lock(&s->lock); | |
1843 | if (ret < 0) { | |
1844 | goto fail; | |
5ebaa27e FZ |
1845 | } |
1846 | } else { | |
1847 | /* Note: in this case, no need to wait */ | |
ecfe1863 | 1848 | qemu_iovec_memset(&hd_qiov, 0, 0, cur_bytes); |
5ebaa27e | 1849 | } |
68d000a3 KW |
1850 | break; |
1851 | ||
fdfab37d EB |
1852 | case QCOW2_CLUSTER_ZERO_PLAIN: |
1853 | case QCOW2_CLUSTER_ZERO_ALLOC: | |
ecfe1863 | 1854 | qemu_iovec_memset(&hd_qiov, 0, 0, cur_bytes); |
6377af48 KW |
1855 | break; |
1856 | ||
68d000a3 | 1857 | case QCOW2_CLUSTER_COMPRESSED: |
5ebaa27e FZ |
1858 | /* add AIO support for compressed blocks ? */ |
1859 | ret = qcow2_decompress_cluster(bs, cluster_offset); | |
1860 | if (ret < 0) { | |
3fc48d09 | 1861 | goto fail; |
bd28f835 KW |
1862 | } |
1863 | ||
03396148 | 1864 | qemu_iovec_from_buf(&hd_qiov, 0, |
ecfe1863 KW |
1865 | s->cluster_cache + offset_in_cluster, |
1866 | cur_bytes); | |
68d000a3 KW |
1867 | break; |
1868 | ||
1869 | case QCOW2_CLUSTER_NORMAL: | |
5ebaa27e | 1870 | if ((cluster_offset & 511) != 0) { |
3fc48d09 FZ |
1871 | ret = -EIO; |
1872 | goto fail; | |
5ebaa27e | 1873 | } |
bd28f835 | 1874 | |
8336aafa | 1875 | if (bs->encrypted) { |
b25b387f | 1876 | assert(s->crypto); |
8336aafa | 1877 | |
5ebaa27e FZ |
1878 | /* |
1879 | * For encrypted images, read everything into a temporary | |
1880 | * contiguous buffer on which the AES functions can work. | |
1881 | */ | |
3fc48d09 FZ |
1882 | if (!cluster_data) { |
1883 | cluster_data = | |
9a4f4c31 KW |
1884 | qemu_try_blockalign(bs->file->bs, |
1885 | QCOW_MAX_CRYPT_CLUSTERS | |
1886 | * s->cluster_size); | |
de82815d KW |
1887 | if (cluster_data == NULL) { |
1888 | ret = -ENOMEM; | |
1889 | goto fail; | |
1890 | } | |
5ebaa27e FZ |
1891 | } |
1892 | ||
ecfe1863 | 1893 | assert(cur_bytes <= QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size); |
3fc48d09 | 1894 | qemu_iovec_reset(&hd_qiov); |
ecfe1863 | 1895 | qemu_iovec_add(&hd_qiov, cluster_data, cur_bytes); |
5ebaa27e FZ |
1896 | } |
1897 | ||
1898 | BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO); | |
1899 | qemu_co_mutex_unlock(&s->lock); | |
a03ef88f | 1900 | ret = bdrv_co_preadv(bs->file, |
ecfe1863 KW |
1901 | cluster_offset + offset_in_cluster, |
1902 | cur_bytes, &hd_qiov, 0); | |
5ebaa27e FZ |
1903 | qemu_co_mutex_lock(&s->lock); |
1904 | if (ret < 0) { | |
3fc48d09 | 1905 | goto fail; |
5ebaa27e | 1906 | } |
8336aafa | 1907 | if (bs->encrypted) { |
b25b387f | 1908 | assert(s->crypto); |
ecfe1863 KW |
1909 | assert((offset & (BDRV_SECTOR_SIZE - 1)) == 0); |
1910 | assert((cur_bytes & (BDRV_SECTOR_SIZE - 1)) == 0); | |
b25b387f | 1911 | if (qcrypto_block_decrypt(s->crypto, |
4652b8f3 DB |
1912 | (s->crypt_physical_offset ? |
1913 | cluster_offset + offset_in_cluster : | |
4609742a | 1914 | offset), |
446d306d | 1915 | cluster_data, |
b25b387f | 1916 | cur_bytes, |
c3a8fe33 | 1917 | NULL) < 0) { |
f6fa64f6 DB |
1918 | ret = -EIO; |
1919 | goto fail; | |
1920 | } | |
ecfe1863 | 1921 | qemu_iovec_from_buf(qiov, bytes_done, cluster_data, cur_bytes); |
5ebaa27e | 1922 | } |
68d000a3 KW |
1923 | break; |
1924 | ||
1925 | default: | |
1926 | g_assert_not_reached(); | |
1927 | ret = -EIO; | |
1928 | goto fail; | |
faf575c1 | 1929 | } |
f141eafe | 1930 | |
ecfe1863 KW |
1931 | bytes -= cur_bytes; |
1932 | offset += cur_bytes; | |
1933 | bytes_done += cur_bytes; | |
5ebaa27e | 1934 | } |
3fc48d09 | 1935 | ret = 0; |
faf575c1 | 1936 | |
3fc48d09 | 1937 | fail: |
68d100e9 | 1938 | qemu_co_mutex_unlock(&s->lock); |
42496d62 | 1939 | |
3fc48d09 | 1940 | qemu_iovec_destroy(&hd_qiov); |
dea43a65 | 1941 | qemu_vfree(cluster_data); |
68d100e9 KW |
1942 | |
1943 | return ret; | |
585f8587 FB |
1944 | } |
1945 | ||
ee22a9d8 AG |
1946 | /* Check if it's possible to merge a write request with the writing of |
1947 | * the data from the COW regions */ | |
1948 | static bool merge_cow(uint64_t offset, unsigned bytes, | |
1949 | QEMUIOVector *hd_qiov, QCowL2Meta *l2meta) | |
1950 | { | |
1951 | QCowL2Meta *m; | |
1952 | ||
1953 | for (m = l2meta; m != NULL; m = m->next) { | |
1954 | /* If both COW regions are empty then there's nothing to merge */ | |
1955 | if (m->cow_start.nb_bytes == 0 && m->cow_end.nb_bytes == 0) { | |
1956 | continue; | |
1957 | } | |
1958 | ||
1959 | /* The data (middle) region must be immediately after the | |
1960 | * start region */ | |
1961 | if (l2meta_cow_start(m) + m->cow_start.nb_bytes != offset) { | |
1962 | continue; | |
1963 | } | |
1964 | ||
1965 | /* The end region must be immediately after the data (middle) | |
1966 | * region */ | |
1967 | if (m->offset + m->cow_end.offset != offset + bytes) { | |
1968 | continue; | |
1969 | } | |
1970 | ||
1971 | /* Make sure that adding both COW regions to the QEMUIOVector | |
1972 | * does not exceed IOV_MAX */ | |
1973 | if (hd_qiov->niov > IOV_MAX - 2) { | |
1974 | continue; | |
1975 | } | |
1976 | ||
1977 | m->data_qiov = hd_qiov; | |
1978 | return true; | |
1979 | } | |
1980 | ||
1981 | return false; | |
1982 | } | |
1983 | ||
d46a0bb2 KW |
1984 | static coroutine_fn int qcow2_co_pwritev(BlockDriverState *bs, uint64_t offset, |
1985 | uint64_t bytes, QEMUIOVector *qiov, | |
1986 | int flags) | |
585f8587 | 1987 | { |
ff99129a | 1988 | BDRVQcow2State *s = bs->opaque; |
d46a0bb2 | 1989 | int offset_in_cluster; |
68d100e9 | 1990 | int ret; |
d46a0bb2 | 1991 | unsigned int cur_bytes; /* number of sectors in current iteration */ |
c2bdd990 | 1992 | uint64_t cluster_offset; |
3fc48d09 FZ |
1993 | QEMUIOVector hd_qiov; |
1994 | uint64_t bytes_done = 0; | |
1995 | uint8_t *cluster_data = NULL; | |
8d2497c3 | 1996 | QCowL2Meta *l2meta = NULL; |
c2271403 | 1997 | |
d46a0bb2 | 1998 | trace_qcow2_writev_start_req(qemu_coroutine_self(), offset, bytes); |
3cce16f4 | 1999 | |
3fc48d09 FZ |
2000 | qemu_iovec_init(&hd_qiov, qiov->niov); |
2001 | ||
2002 | s->cluster_cache_offset = -1; /* disable compressed cache */ | |
3b46e624 | 2003 | |
3fc48d09 FZ |
2004 | qemu_co_mutex_lock(&s->lock); |
2005 | ||
d46a0bb2 | 2006 | while (bytes != 0) { |
3fc48d09 | 2007 | |
f50f88b9 | 2008 | l2meta = NULL; |
cf5c1a23 | 2009 | |
3cce16f4 | 2010 | trace_qcow2_writev_start_part(qemu_coroutine_self()); |
d46a0bb2 KW |
2011 | offset_in_cluster = offset_into_cluster(s, offset); |
2012 | cur_bytes = MIN(bytes, INT_MAX); | |
2013 | if (bs->encrypted) { | |
2014 | cur_bytes = MIN(cur_bytes, | |
2015 | QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size | |
2016 | - offset_in_cluster); | |
5ebaa27e | 2017 | } |
095a9c58 | 2018 | |
d46a0bb2 KW |
2019 | ret = qcow2_alloc_cluster_offset(bs, offset, &cur_bytes, |
2020 | &cluster_offset, &l2meta); | |
5ebaa27e | 2021 | if (ret < 0) { |
3fc48d09 | 2022 | goto fail; |
5ebaa27e | 2023 | } |
148da7ea | 2024 | |
5ebaa27e | 2025 | assert((cluster_offset & 511) == 0); |
148da7ea | 2026 | |
3fc48d09 | 2027 | qemu_iovec_reset(&hd_qiov); |
d46a0bb2 | 2028 | qemu_iovec_concat(&hd_qiov, qiov, bytes_done, cur_bytes); |
6f5f060b | 2029 | |
8336aafa | 2030 | if (bs->encrypted) { |
b25b387f | 2031 | assert(s->crypto); |
3fc48d09 | 2032 | if (!cluster_data) { |
9a4f4c31 | 2033 | cluster_data = qemu_try_blockalign(bs->file->bs, |
de82815d KW |
2034 | QCOW_MAX_CRYPT_CLUSTERS |
2035 | * s->cluster_size); | |
2036 | if (cluster_data == NULL) { | |
2037 | ret = -ENOMEM; | |
2038 | goto fail; | |
2039 | } | |
5ebaa27e | 2040 | } |
6f5f060b | 2041 | |
3fc48d09 | 2042 | assert(hd_qiov.size <= |
5ebaa27e | 2043 | QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size); |
d5e6b161 | 2044 | qemu_iovec_to_buf(&hd_qiov, 0, cluster_data, hd_qiov.size); |
6f5f060b | 2045 | |
4652b8f3 DB |
2046 | if (qcrypto_block_encrypt(s->crypto, |
2047 | (s->crypt_physical_offset ? | |
2048 | cluster_offset + offset_in_cluster : | |
4609742a | 2049 | offset), |
446d306d | 2050 | cluster_data, |
c3a8fe33 | 2051 | cur_bytes, NULL) < 0) { |
f6fa64f6 DB |
2052 | ret = -EIO; |
2053 | goto fail; | |
2054 | } | |
6f5f060b | 2055 | |
3fc48d09 | 2056 | qemu_iovec_reset(&hd_qiov); |
d46a0bb2 | 2057 | qemu_iovec_add(&hd_qiov, cluster_data, cur_bytes); |
5ebaa27e | 2058 | } |
6f5f060b | 2059 | |
231bb267 | 2060 | ret = qcow2_pre_write_overlap_check(bs, 0, |
d46a0bb2 | 2061 | cluster_offset + offset_in_cluster, cur_bytes); |
cf93980e HR |
2062 | if (ret < 0) { |
2063 | goto fail; | |
2064 | } | |
2065 | ||
ee22a9d8 AG |
2066 | /* If we need to do COW, check if it's possible to merge the |
2067 | * writing of the guest data together with that of the COW regions. | |
2068 | * If it's not possible (or not necessary) then write the | |
2069 | * guest data now. */ | |
2070 | if (!merge_cow(offset, cur_bytes, &hd_qiov, l2meta)) { | |
2071 | qemu_co_mutex_unlock(&s->lock); | |
2072 | BLKDBG_EVENT(bs->file, BLKDBG_WRITE_AIO); | |
2073 | trace_qcow2_writev_data(qemu_coroutine_self(), | |
2074 | cluster_offset + offset_in_cluster); | |
2075 | ret = bdrv_co_pwritev(bs->file, | |
2076 | cluster_offset + offset_in_cluster, | |
2077 | cur_bytes, &hd_qiov, 0); | |
2078 | qemu_co_mutex_lock(&s->lock); | |
2079 | if (ret < 0) { | |
2080 | goto fail; | |
2081 | } | |
5ebaa27e | 2082 | } |
f141eafe | 2083 | |
fd9fcd37 FZ |
2084 | ret = qcow2_handle_l2meta(bs, &l2meta, true); |
2085 | if (ret) { | |
2086 | goto fail; | |
f50f88b9 | 2087 | } |
0fa9131a | 2088 | |
d46a0bb2 KW |
2089 | bytes -= cur_bytes; |
2090 | offset += cur_bytes; | |
2091 | bytes_done += cur_bytes; | |
2092 | trace_qcow2_writev_done_part(qemu_coroutine_self(), cur_bytes); | |
5ebaa27e | 2093 | } |
3fc48d09 | 2094 | ret = 0; |
faf575c1 | 2095 | |
3fc48d09 | 2096 | fail: |
fd9fcd37 | 2097 | qcow2_handle_l2meta(bs, &l2meta, false); |
0fa9131a | 2098 | |
a8c57408 PB |
2099 | qemu_co_mutex_unlock(&s->lock); |
2100 | ||
3fc48d09 | 2101 | qemu_iovec_destroy(&hd_qiov); |
dea43a65 | 2102 | qemu_vfree(cluster_data); |
3cce16f4 | 2103 | trace_qcow2_writev_done_req(qemu_coroutine_self(), ret); |
42496d62 | 2104 | |
68d100e9 | 2105 | return ret; |
585f8587 FB |
2106 | } |
2107 | ||
ec6d8912 KW |
2108 | static int qcow2_inactivate(BlockDriverState *bs) |
2109 | { | |
2110 | BDRVQcow2State *s = bs->opaque; | |
2111 | int ret, result = 0; | |
5f72826e | 2112 | Error *local_err = NULL; |
ec6d8912 | 2113 | |
83a8c775 PB |
2114 | qcow2_store_persistent_dirty_bitmaps(bs, &local_err); |
2115 | if (local_err != NULL) { | |
2116 | result = -EINVAL; | |
2117 | error_report_err(local_err); | |
2118 | error_report("Persistent bitmaps are lost for node '%s'", | |
2119 | bdrv_get_device_or_node_name(bs)); | |
2120 | } | |
2121 | ||
ec6d8912 KW |
2122 | ret = qcow2_cache_flush(bs, s->l2_table_cache); |
2123 | if (ret) { | |
2124 | result = ret; | |
2125 | error_report("Failed to flush the L2 table cache: %s", | |
2126 | strerror(-ret)); | |
2127 | } | |
2128 | ||
2129 | ret = qcow2_cache_flush(bs, s->refcount_block_cache); | |
2130 | if (ret) { | |
2131 | result = ret; | |
2132 | error_report("Failed to flush the refcount block cache: %s", | |
2133 | strerror(-ret)); | |
2134 | } | |
2135 | ||
2136 | if (result == 0) { | |
2137 | qcow2_mark_clean(bs); | |
2138 | } | |
2139 | ||
2140 | return result; | |
2141 | } | |
2142 | ||
7c80ab3f | 2143 | static void qcow2_close(BlockDriverState *bs) |
585f8587 | 2144 | { |
ff99129a | 2145 | BDRVQcow2State *s = bs->opaque; |
de82815d | 2146 | qemu_vfree(s->l1_table); |
cf93980e HR |
2147 | /* else pre-write overlap checks in cache_destroy may crash */ |
2148 | s->l1_table = NULL; | |
29c1a730 | 2149 | |
140fd5a6 | 2150 | if (!(s->flags & BDRV_O_INACTIVE)) { |
ec6d8912 | 2151 | qcow2_inactivate(bs); |
27eb6c09 | 2152 | } |
c61d0004 | 2153 | |
279621c0 | 2154 | cache_clean_timer_del(bs); |
e64d4072 AG |
2155 | qcow2_cache_destroy(s->l2_table_cache); |
2156 | qcow2_cache_destroy(s->refcount_block_cache); | |
29c1a730 | 2157 | |
b25b387f DB |
2158 | qcrypto_block_free(s->crypto); |
2159 | s->crypto = NULL; | |
f6fa64f6 | 2160 | |
6744cbab | 2161 | g_free(s->unknown_header_fields); |
75bab85c | 2162 | cleanup_unknown_header_ext(bs); |
6744cbab | 2163 | |
e4603fe1 KW |
2164 | g_free(s->image_backing_file); |
2165 | g_free(s->image_backing_format); | |
2166 | ||
7267c094 | 2167 | g_free(s->cluster_cache); |
dea43a65 | 2168 | qemu_vfree(s->cluster_data); |
ed6ccf0f | 2169 | qcow2_refcount_close(bs); |
28c1202b | 2170 | qcow2_free_snapshots(bs); |
585f8587 FB |
2171 | } |
2172 | ||
2b148f39 PB |
2173 | static void coroutine_fn qcow2_co_invalidate_cache(BlockDriverState *bs, |
2174 | Error **errp) | |
06d9260f | 2175 | { |
ff99129a | 2176 | BDRVQcow2State *s = bs->opaque; |
06d9260f | 2177 | int flags = s->flags; |
b25b387f | 2178 | QCryptoBlock *crypto = NULL; |
acdfb480 | 2179 | QDict *options; |
5a8a30db KW |
2180 | Error *local_err = NULL; |
2181 | int ret; | |
06d9260f AL |
2182 | |
2183 | /* | |
2184 | * Backing files are read-only which makes all of their metadata immutable, | |
2185 | * that means we don't have to worry about reopening them here. | |
2186 | */ | |
2187 | ||
b25b387f DB |
2188 | crypto = s->crypto; |
2189 | s->crypto = NULL; | |
06d9260f AL |
2190 | |
2191 | qcow2_close(bs); | |
2192 | ||
ff99129a | 2193 | memset(s, 0, sizeof(BDRVQcow2State)); |
d475e5ac | 2194 | options = qdict_clone_shallow(bs->options); |
5a8a30db | 2195 | |
140fd5a6 | 2196 | flags &= ~BDRV_O_INACTIVE; |
2b148f39 | 2197 | qemu_co_mutex_lock(&s->lock); |
4e4bf5c4 | 2198 | ret = qcow2_do_open(bs, options, flags, &local_err); |
2b148f39 | 2199 | qemu_co_mutex_unlock(&s->lock); |
cb3e7f08 | 2200 | qobject_unref(options); |
5a8a30db | 2201 | if (local_err) { |
e43bfd9c MA |
2202 | error_propagate(errp, local_err); |
2203 | error_prepend(errp, "Could not reopen qcow2 layer: "); | |
191fb11b | 2204 | bs->drv = NULL; |
5a8a30db KW |
2205 | return; |
2206 | } else if (ret < 0) { | |
2207 | error_setg_errno(errp, -ret, "Could not reopen qcow2 layer"); | |
191fb11b | 2208 | bs->drv = NULL; |
5a8a30db KW |
2209 | return; |
2210 | } | |
acdfb480 | 2211 | |
b25b387f | 2212 | s->crypto = crypto; |
06d9260f AL |
2213 | } |
2214 | ||
e24e49e6 KW |
2215 | static size_t header_ext_add(char *buf, uint32_t magic, const void *s, |
2216 | size_t len, size_t buflen) | |
2217 | { | |
2218 | QCowExtension *ext_backing_fmt = (QCowExtension*) buf; | |
2219 | size_t ext_len = sizeof(QCowExtension) + ((len + 7) & ~7); | |
2220 | ||
2221 | if (buflen < ext_len) { | |
2222 | return -ENOSPC; | |
2223 | } | |
2224 | ||
2225 | *ext_backing_fmt = (QCowExtension) { | |
2226 | .magic = cpu_to_be32(magic), | |
2227 | .len = cpu_to_be32(len), | |
2228 | }; | |
0647d47c SH |
2229 | |
2230 | if (len) { | |
2231 | memcpy(buf + sizeof(QCowExtension), s, len); | |
2232 | } | |
e24e49e6 KW |
2233 | |
2234 | return ext_len; | |
2235 | } | |
2236 | ||
756e6736 | 2237 | /* |
e24e49e6 KW |
2238 | * Updates the qcow2 header, including the variable length parts of it, i.e. |
2239 | * the backing file name and all extensions. qcow2 was not designed to allow | |
2240 | * such changes, so if we run out of space (we can only use the first cluster) | |
2241 | * this function may fail. | |
756e6736 KW |
2242 | * |
2243 | * Returns 0 on success, -errno in error cases. | |
2244 | */ | |
e24e49e6 | 2245 | int qcow2_update_header(BlockDriverState *bs) |
756e6736 | 2246 | { |
ff99129a | 2247 | BDRVQcow2State *s = bs->opaque; |
e24e49e6 KW |
2248 | QCowHeader *header; |
2249 | char *buf; | |
2250 | size_t buflen = s->cluster_size; | |
756e6736 | 2251 | int ret; |
e24e49e6 KW |
2252 | uint64_t total_size; |
2253 | uint32_t refcount_table_clusters; | |
6744cbab | 2254 | size_t header_length; |
75bab85c | 2255 | Qcow2UnknownHeaderExtension *uext; |
756e6736 | 2256 | |
e24e49e6 | 2257 | buf = qemu_blockalign(bs, buflen); |
756e6736 | 2258 | |
e24e49e6 KW |
2259 | /* Header structure */ |
2260 | header = (QCowHeader*) buf; | |
756e6736 | 2261 | |
e24e49e6 KW |
2262 | if (buflen < sizeof(*header)) { |
2263 | ret = -ENOSPC; | |
2264 | goto fail; | |
756e6736 KW |
2265 | } |
2266 | ||
6744cbab | 2267 | header_length = sizeof(*header) + s->unknown_header_fields_size; |
e24e49e6 KW |
2268 | total_size = bs->total_sectors * BDRV_SECTOR_SIZE; |
2269 | refcount_table_clusters = s->refcount_table_size >> (s->cluster_bits - 3); | |
2270 | ||
2271 | *header = (QCowHeader) { | |
6744cbab | 2272 | /* Version 2 fields */ |
e24e49e6 | 2273 | .magic = cpu_to_be32(QCOW_MAGIC), |
6744cbab | 2274 | .version = cpu_to_be32(s->qcow_version), |
e24e49e6 KW |
2275 | .backing_file_offset = 0, |
2276 | .backing_file_size = 0, | |
2277 | .cluster_bits = cpu_to_be32(s->cluster_bits), | |
2278 | .size = cpu_to_be64(total_size), | |
2279 | .crypt_method = cpu_to_be32(s->crypt_method_header), | |
2280 | .l1_size = cpu_to_be32(s->l1_size), | |
2281 | .l1_table_offset = cpu_to_be64(s->l1_table_offset), | |
2282 | .refcount_table_offset = cpu_to_be64(s->refcount_table_offset), | |
2283 | .refcount_table_clusters = cpu_to_be32(refcount_table_clusters), | |
2284 | .nb_snapshots = cpu_to_be32(s->nb_snapshots), | |
2285 | .snapshots_offset = cpu_to_be64(s->snapshots_offset), | |
6744cbab KW |
2286 | |
2287 | /* Version 3 fields */ | |
2288 | .incompatible_features = cpu_to_be64(s->incompatible_features), | |
2289 | .compatible_features = cpu_to_be64(s->compatible_features), | |
2290 | .autoclear_features = cpu_to_be64(s->autoclear_features), | |
b6481f37 | 2291 | .refcount_order = cpu_to_be32(s->refcount_order), |
6744cbab | 2292 | .header_length = cpu_to_be32(header_length), |
e24e49e6 | 2293 | }; |
756e6736 | 2294 | |
6744cbab KW |
2295 | /* For older versions, write a shorter header */ |
2296 | switch (s->qcow_version) { | |
2297 | case 2: | |
2298 | ret = offsetof(QCowHeader, incompatible_features); | |
2299 | break; | |
2300 | case 3: | |
2301 | ret = sizeof(*header); | |
2302 | break; | |
2303 | default: | |
b6c14762 JM |
2304 | ret = -EINVAL; |
2305 | goto fail; | |
6744cbab KW |
2306 | } |
2307 | ||
2308 | buf += ret; | |
2309 | buflen -= ret; | |
2310 | memset(buf, 0, buflen); | |
2311 | ||
2312 | /* Preserve any unknown field in the header */ | |
2313 | if (s->unknown_header_fields_size) { | |
2314 | if (buflen < s->unknown_header_fields_size) { | |
2315 | ret = -ENOSPC; | |
2316 | goto fail; | |
2317 | } | |
2318 | ||
2319 | memcpy(buf, s->unknown_header_fields, s->unknown_header_fields_size); | |
2320 | buf += s->unknown_header_fields_size; | |
2321 | buflen -= s->unknown_header_fields_size; | |
2322 | } | |
756e6736 | 2323 | |
e24e49e6 | 2324 | /* Backing file format header extension */ |
e4603fe1 | 2325 | if (s->image_backing_format) { |
e24e49e6 | 2326 | ret = header_ext_add(buf, QCOW2_EXT_MAGIC_BACKING_FORMAT, |
e4603fe1 KW |
2327 | s->image_backing_format, |
2328 | strlen(s->image_backing_format), | |
e24e49e6 KW |
2329 | buflen); |
2330 | if (ret < 0) { | |
2331 | goto fail; | |
756e6736 KW |
2332 | } |
2333 | ||
e24e49e6 KW |
2334 | buf += ret; |
2335 | buflen -= ret; | |
756e6736 KW |
2336 | } |
2337 | ||
4652b8f3 DB |
2338 | /* Full disk encryption header pointer extension */ |
2339 | if (s->crypto_header.offset != 0) { | |
2340 | cpu_to_be64s(&s->crypto_header.offset); | |
2341 | cpu_to_be64s(&s->crypto_header.length); | |
2342 | ret = header_ext_add(buf, QCOW2_EXT_MAGIC_CRYPTO_HEADER, | |
2343 | &s->crypto_header, sizeof(s->crypto_header), | |
2344 | buflen); | |
2345 | be64_to_cpus(&s->crypto_header.offset); | |
2346 | be64_to_cpus(&s->crypto_header.length); | |
2347 | if (ret < 0) { | |
2348 | goto fail; | |
2349 | } | |
2350 | buf += ret; | |
2351 | buflen -= ret; | |
2352 | } | |
2353 | ||
cfcc4c62 | 2354 | /* Feature table */ |
1a4828c7 KW |
2355 | if (s->qcow_version >= 3) { |
2356 | Qcow2Feature features[] = { | |
2357 | { | |
2358 | .type = QCOW2_FEAT_TYPE_INCOMPATIBLE, | |
2359 | .bit = QCOW2_INCOMPAT_DIRTY_BITNR, | |
2360 | .name = "dirty bit", | |
2361 | }, | |
2362 | { | |
2363 | .type = QCOW2_FEAT_TYPE_INCOMPATIBLE, | |
2364 | .bit = QCOW2_INCOMPAT_CORRUPT_BITNR, | |
2365 | .name = "corrupt bit", | |
2366 | }, | |
2367 | { | |
2368 | .type = QCOW2_FEAT_TYPE_COMPATIBLE, | |
2369 | .bit = QCOW2_COMPAT_LAZY_REFCOUNTS_BITNR, | |
2370 | .name = "lazy refcounts", | |
2371 | }, | |
2372 | }; | |
2373 | ||
2374 | ret = header_ext_add(buf, QCOW2_EXT_MAGIC_FEATURE_TABLE, | |
2375 | features, sizeof(features), buflen); | |
2376 | if (ret < 0) { | |
2377 | goto fail; | |
2378 | } | |
2379 | buf += ret; | |
2380 | buflen -= ret; | |
cfcc4c62 | 2381 | } |
cfcc4c62 | 2382 | |
88ddffae VSO |
2383 | /* Bitmap extension */ |
2384 | if (s->nb_bitmaps > 0) { | |
2385 | Qcow2BitmapHeaderExt bitmaps_header = { | |
2386 | .nb_bitmaps = cpu_to_be32(s->nb_bitmaps), | |
2387 | .bitmap_directory_size = | |
2388 | cpu_to_be64(s->bitmap_directory_size), | |
2389 | .bitmap_directory_offset = | |
2390 | cpu_to_be64(s->bitmap_directory_offset) | |
2391 | }; | |
2392 | ret = header_ext_add(buf, QCOW2_EXT_MAGIC_BITMAPS, | |
2393 | &bitmaps_header, sizeof(bitmaps_header), | |
2394 | buflen); | |
2395 | if (ret < 0) { | |
2396 | goto fail; | |
2397 | } | |
2398 | buf += ret; | |
2399 | buflen -= ret; | |
2400 | } | |
2401 | ||
75bab85c KW |
2402 | /* Keep unknown header extensions */ |
2403 | QLIST_FOREACH(uext, &s->unknown_header_ext, next) { | |
2404 | ret = header_ext_add(buf, uext->magic, uext->data, uext->len, buflen); | |
2405 | if (ret < 0) { | |
2406 | goto fail; | |
2407 | } | |
2408 | ||
2409 | buf += ret; | |
2410 | buflen -= ret; | |
2411 | } | |
2412 | ||
e24e49e6 KW |
2413 | /* End of header extensions */ |
2414 | ret = header_ext_add(buf, QCOW2_EXT_MAGIC_END, NULL, 0, buflen); | |
756e6736 KW |
2415 | if (ret < 0) { |
2416 | goto fail; | |
2417 | } | |
2418 | ||
e24e49e6 KW |
2419 | buf += ret; |
2420 | buflen -= ret; | |
756e6736 | 2421 | |
e24e49e6 | 2422 | /* Backing file name */ |
e4603fe1 KW |
2423 | if (s->image_backing_file) { |
2424 | size_t backing_file_len = strlen(s->image_backing_file); | |
e24e49e6 KW |
2425 | |
2426 | if (buflen < backing_file_len) { | |
2427 | ret = -ENOSPC; | |
2428 | goto fail; | |
2429 | } | |
2430 | ||
00ea1881 | 2431 | /* Using strncpy is ok here, since buf is not NUL-terminated. */ |
e4603fe1 | 2432 | strncpy(buf, s->image_backing_file, buflen); |
e24e49e6 KW |
2433 | |
2434 | header->backing_file_offset = cpu_to_be64(buf - ((char*) header)); | |
2435 | header->backing_file_size = cpu_to_be32(backing_file_len); | |
756e6736 KW |
2436 | } |
2437 | ||
e24e49e6 | 2438 | /* Write the new header */ |
d9ca2ea2 | 2439 | ret = bdrv_pwrite(bs->file, 0, header, s->cluster_size); |
756e6736 KW |
2440 | if (ret < 0) { |
2441 | goto fail; | |
2442 | } | |
2443 | ||
2444 | ret = 0; | |
2445 | fail: | |
e24e49e6 | 2446 | qemu_vfree(header); |
756e6736 KW |
2447 | return ret; |
2448 | } | |
2449 | ||
2450 | static int qcow2_change_backing_file(BlockDriverState *bs, | |
2451 | const char *backing_file, const char *backing_fmt) | |
2452 | { | |
ff99129a | 2453 | BDRVQcow2State *s = bs->opaque; |
e4603fe1 | 2454 | |
4e876bcf HR |
2455 | if (backing_file && strlen(backing_file) > 1023) { |
2456 | return -EINVAL; | |
2457 | } | |
2458 | ||
e24e49e6 KW |
2459 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: ""); |
2460 | pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: ""); | |
2461 | ||
e4603fe1 KW |
2462 | g_free(s->image_backing_file); |
2463 | g_free(s->image_backing_format); | |
2464 | ||
2465 | s->image_backing_file = backing_file ? g_strdup(bs->backing_file) : NULL; | |
2466 | s->image_backing_format = backing_fmt ? g_strdup(bs->backing_format) : NULL; | |
2467 | ||
e24e49e6 | 2468 | return qcow2_update_header(bs); |
756e6736 KW |
2469 | } |
2470 | ||
4652b8f3 DB |
2471 | static int qcow2_crypt_method_from_format(const char *encryptfmt) |
2472 | { | |
2473 | if (g_str_equal(encryptfmt, "luks")) { | |
2474 | return QCOW_CRYPT_LUKS; | |
2475 | } else if (g_str_equal(encryptfmt, "aes")) { | |
2476 | return QCOW_CRYPT_AES; | |
2477 | } else { | |
2478 | return -EINVAL; | |
2479 | } | |
2480 | } | |
b25b387f | 2481 | |
60900b7b KW |
2482 | static int qcow2_set_up_encryption(BlockDriverState *bs, |
2483 | QCryptoBlockCreateOptions *cryptoopts, | |
2484 | Error **errp) | |
2485 | { | |
2486 | BDRVQcow2State *s = bs->opaque; | |
2487 | QCryptoBlock *crypto = NULL; | |
2488 | int fmt, ret; | |
2489 | ||
2490 | switch (cryptoopts->format) { | |
2491 | case Q_CRYPTO_BLOCK_FORMAT_LUKS: | |
2492 | fmt = QCOW_CRYPT_LUKS; | |
2493 | break; | |
2494 | case Q_CRYPTO_BLOCK_FORMAT_QCOW: | |
2495 | fmt = QCOW_CRYPT_AES; | |
2496 | break; | |
2497 | default: | |
2498 | error_setg(errp, "Crypto format not supported in qcow2"); | |
2499 | return -EINVAL; | |
b25b387f | 2500 | } |
60900b7b | 2501 | |
4652b8f3 | 2502 | s->crypt_method_header = fmt; |
b25b387f | 2503 | |
1cd9a787 | 2504 | crypto = qcrypto_block_create(cryptoopts, "encrypt.", |
4652b8f3 DB |
2505 | qcow2_crypto_hdr_init_func, |
2506 | qcow2_crypto_hdr_write_func, | |
b25b387f DB |
2507 | bs, errp); |
2508 | if (!crypto) { | |
60900b7b | 2509 | return -EINVAL; |
b25b387f DB |
2510 | } |
2511 | ||
2512 | ret = qcow2_update_header(bs); | |
2513 | if (ret < 0) { | |
2514 | error_setg_errno(errp, -ret, "Could not write encryption header"); | |
2515 | goto out; | |
2516 | } | |
2517 | ||
60900b7b | 2518 | ret = 0; |
b25b387f | 2519 | out: |
b25b387f | 2520 | qcrypto_block_free(crypto); |
b25b387f DB |
2521 | return ret; |
2522 | } | |
2523 | ||
7bc45dc1 HR |
2524 | /** |
2525 | * Preallocates metadata structures for data clusters between @offset (in the | |
2526 | * guest disk) and @new_length (which is thus generally the new guest disk | |
2527 | * size). | |
2528 | * | |
2529 | * Returns: 0 on success, -errno on failure. | |
2530 | */ | |
47e86b86 KW |
2531 | static int coroutine_fn preallocate_co(BlockDriverState *bs, uint64_t offset, |
2532 | uint64_t new_length) | |
a35e1c17 | 2533 | { |
d46a0bb2 | 2534 | uint64_t bytes; |
060bee89 | 2535 | uint64_t host_offset = 0; |
d46a0bb2 | 2536 | unsigned int cur_bytes; |
148da7ea | 2537 | int ret; |
f50f88b9 | 2538 | QCowL2Meta *meta; |
a35e1c17 | 2539 | |
7bc45dc1 HR |
2540 | assert(offset <= new_length); |
2541 | bytes = new_length - offset; | |
a35e1c17 | 2542 | |
d46a0bb2 KW |
2543 | while (bytes) { |
2544 | cur_bytes = MIN(bytes, INT_MAX); | |
2545 | ret = qcow2_alloc_cluster_offset(bs, offset, &cur_bytes, | |
060bee89 | 2546 | &host_offset, &meta); |
148da7ea | 2547 | if (ret < 0) { |
47e86b86 | 2548 | return ret; |
a35e1c17 KW |
2549 | } |
2550 | ||
c792707f SH |
2551 | while (meta) { |
2552 | QCowL2Meta *next = meta->next; | |
2553 | ||
7c2bbf4a HT |
2554 | ret = qcow2_alloc_cluster_link_l2(bs, meta); |
2555 | if (ret < 0) { | |
2556 | qcow2_free_any_clusters(bs, meta->alloc_offset, | |
2557 | meta->nb_clusters, QCOW2_DISCARD_NEVER); | |
47e86b86 | 2558 | return ret; |
7c2bbf4a HT |
2559 | } |
2560 | ||
2561 | /* There are no dependent requests, but we need to remove our | |
2562 | * request from the list of in-flight requests */ | |
4e95314e | 2563 | QLIST_REMOVE(meta, next_in_flight); |
c792707f SH |
2564 | |
2565 | g_free(meta); | |
2566 | meta = next; | |
f50f88b9 | 2567 | } |
f214978a | 2568 | |
a35e1c17 KW |
2569 | /* TODO Preallocate data if requested */ |
2570 | ||
d46a0bb2 KW |
2571 | bytes -= cur_bytes; |
2572 | offset += cur_bytes; | |
a35e1c17 KW |
2573 | } |
2574 | ||
2575 | /* | |
2576 | * It is expected that the image file is large enough to actually contain | |
2577 | * all of the allocated clusters (otherwise we get failing reads after | |
2578 | * EOF). Extend the image to the last allocated sector. | |
2579 | */ | |
060bee89 | 2580 | if (host_offset != 0) { |
d46a0bb2 | 2581 | uint8_t data = 0; |
d9ca2ea2 | 2582 | ret = bdrv_pwrite(bs->file, (host_offset + cur_bytes) - 1, |
d46a0bb2 | 2583 | &data, 1); |
19dbcbf7 | 2584 | if (ret < 0) { |
47e86b86 | 2585 | return ret; |
19dbcbf7 | 2586 | } |
a35e1c17 KW |
2587 | } |
2588 | ||
47e86b86 | 2589 | return 0; |
a35e1c17 KW |
2590 | } |
2591 | ||
7c5bcc42 SH |
2592 | /* qcow2_refcount_metadata_size: |
2593 | * @clusters: number of clusters to refcount (including data and L1/L2 tables) | |
2594 | * @cluster_size: size of a cluster, in bytes | |
2595 | * @refcount_order: refcount bits power-of-2 exponent | |
12cc30a8 HR |
2596 | * @generous_increase: allow for the refcount table to be 1.5x as large as it |
2597 | * needs to be | |
7c5bcc42 SH |
2598 | * |
2599 | * Returns: Number of bytes required for refcount blocks and table metadata. | |
2600 | */ | |
12cc30a8 HR |
2601 | int64_t qcow2_refcount_metadata_size(int64_t clusters, size_t cluster_size, |
2602 | int refcount_order, bool generous_increase, | |
2603 | uint64_t *refblock_count) | |
7c5bcc42 SH |
2604 | { |
2605 | /* | |
2606 | * Every host cluster is reference-counted, including metadata (even | |
2607 | * refcount metadata is recursively included). | |
2608 | * | |
2609 | * An accurate formula for the size of refcount metadata size is difficult | |
2610 | * to derive. An easier method of calculation is finding the fixed point | |
2611 | * where no further refcount blocks or table clusters are required to | |
2612 | * reference count every cluster. | |
2613 | */ | |
2614 | int64_t blocks_per_table_cluster = cluster_size / sizeof(uint64_t); | |
2615 | int64_t refcounts_per_block = cluster_size * 8 / (1 << refcount_order); | |
2616 | int64_t table = 0; /* number of refcount table clusters */ | |
2617 | int64_t blocks = 0; /* number of refcount block clusters */ | |
2618 | int64_t last; | |
2619 | int64_t n = 0; | |
2620 | ||
2621 | do { | |
2622 | last = n; | |
2623 | blocks = DIV_ROUND_UP(clusters + table + blocks, refcounts_per_block); | |
2624 | table = DIV_ROUND_UP(blocks, blocks_per_table_cluster); | |
2625 | n = clusters + blocks + table; | |
12cc30a8 HR |
2626 | |
2627 | if (n == last && generous_increase) { | |
2628 | clusters += DIV_ROUND_UP(table, 2); | |
2629 | n = 0; /* force another loop */ | |
2630 | generous_increase = false; | |
2631 | } | |
7c5bcc42 SH |
2632 | } while (n != last); |
2633 | ||
12cc30a8 HR |
2634 | if (refblock_count) { |
2635 | *refblock_count = blocks; | |
2636 | } | |
2637 | ||
7c5bcc42 SH |
2638 | return (blocks + table) * cluster_size; |
2639 | } | |
2640 | ||
95c67e3b SH |
2641 | /** |
2642 | * qcow2_calc_prealloc_size: | |
2643 | * @total_size: virtual disk size in bytes | |
2644 | * @cluster_size: cluster size in bytes | |
2645 | * @refcount_order: refcount bits power-of-2 exponent | |
2646 | * | |
2647 | * Returns: Total number of bytes required for the fully allocated image | |
2648 | * (including metadata). | |
2649 | */ | |
2650 | static int64_t qcow2_calc_prealloc_size(int64_t total_size, | |
2651 | size_t cluster_size, | |
2652 | int refcount_order) | |
2653 | { | |
95c67e3b | 2654 | int64_t meta_size = 0; |
7c5bcc42 | 2655 | uint64_t nl1e, nl2e; |
9e029689 | 2656 | int64_t aligned_total_size = ROUND_UP(total_size, cluster_size); |
95c67e3b SH |
2657 | |
2658 | /* header: 1 cluster */ | |
2659 | meta_size += cluster_size; | |
2660 | ||
2661 | /* total size of L2 tables */ | |
2662 | nl2e = aligned_total_size / cluster_size; | |
9e029689 | 2663 | nl2e = ROUND_UP(nl2e, cluster_size / sizeof(uint64_t)); |
95c67e3b SH |
2664 | meta_size += nl2e * sizeof(uint64_t); |
2665 | ||
2666 | /* total size of L1 tables */ | |
2667 | nl1e = nl2e * sizeof(uint64_t) / cluster_size; | |
9e029689 | 2668 | nl1e = ROUND_UP(nl1e, cluster_size / sizeof(uint64_t)); |
95c67e3b SH |
2669 | meta_size += nl1e * sizeof(uint64_t); |
2670 | ||
7c5bcc42 SH |
2671 | /* total size of refcount table and blocks */ |
2672 | meta_size += qcow2_refcount_metadata_size( | |
2673 | (meta_size + aligned_total_size) / cluster_size, | |
12cc30a8 | 2674 | cluster_size, refcount_order, false, NULL); |
95c67e3b SH |
2675 | |
2676 | return meta_size + aligned_total_size; | |
2677 | } | |
2678 | ||
29ca9e45 | 2679 | static bool validate_cluster_size(size_t cluster_size, Error **errp) |
a9420734 | 2680 | { |
29ca9e45 | 2681 | int cluster_bits = ctz32(cluster_size); |
a9420734 KW |
2682 | if (cluster_bits < MIN_CLUSTER_BITS || cluster_bits > MAX_CLUSTER_BITS || |
2683 | (1 << cluster_bits) != cluster_size) | |
2684 | { | |
3ef6c40a HR |
2685 | error_setg(errp, "Cluster size must be a power of two between %d and " |
2686 | "%dk", 1 << MIN_CLUSTER_BITS, 1 << (MAX_CLUSTER_BITS - 10)); | |
29ca9e45 KW |
2687 | return false; |
2688 | } | |
2689 | return true; | |
2690 | } | |
2691 | ||
2692 | static size_t qcow2_opt_get_cluster_size_del(QemuOpts *opts, Error **errp) | |
2693 | { | |
2694 | size_t cluster_size; | |
2695 | ||
2696 | cluster_size = qemu_opt_get_size_del(opts, BLOCK_OPT_CLUSTER_SIZE, | |
2697 | DEFAULT_CLUSTER_SIZE); | |
2698 | if (!validate_cluster_size(cluster_size, errp)) { | |
0eb4a8c1 SH |
2699 | return 0; |
2700 | } | |
2701 | return cluster_size; | |
2702 | } | |
2703 | ||
2704 | static int qcow2_opt_get_version_del(QemuOpts *opts, Error **errp) | |
2705 | { | |
2706 | char *buf; | |
2707 | int ret; | |
2708 | ||
2709 | buf = qemu_opt_get_del(opts, BLOCK_OPT_COMPAT_LEVEL); | |
2710 | if (!buf) { | |
2711 | ret = 3; /* default */ | |
2712 | } else if (!strcmp(buf, "0.10")) { | |
2713 | ret = 2; | |
2714 | } else if (!strcmp(buf, "1.1")) { | |
2715 | ret = 3; | |
2716 | } else { | |
2717 | error_setg(errp, "Invalid compatibility level: '%s'", buf); | |
2718 | ret = -EINVAL; | |
2719 | } | |
2720 | g_free(buf); | |
2721 | return ret; | |
2722 | } | |
2723 | ||
2724 | static uint64_t qcow2_opt_get_refcount_bits_del(QemuOpts *opts, int version, | |
2725 | Error **errp) | |
2726 | { | |
2727 | uint64_t refcount_bits; | |
2728 | ||
2729 | refcount_bits = qemu_opt_get_number_del(opts, BLOCK_OPT_REFCOUNT_BITS, 16); | |
2730 | if (refcount_bits > 64 || !is_power_of_2(refcount_bits)) { | |
2731 | error_setg(errp, "Refcount width must be a power of two and may not " | |
2732 | "exceed 64 bits"); | |
2733 | return 0; | |
2734 | } | |
2735 | ||
2736 | if (version < 3 && refcount_bits != 16) { | |
2737 | error_setg(errp, "Different refcount widths than 16 bits require " | |
2738 | "compatibility level 1.1 or above (use compat=1.1 or " | |
2739 | "greater)"); | |
2740 | return 0; | |
a9420734 KW |
2741 | } |
2742 | ||
0eb4a8c1 SH |
2743 | return refcount_bits; |
2744 | } | |
2745 | ||
c274393a | 2746 | static int coroutine_fn |
60900b7b | 2747 | qcow2_co_create(BlockdevCreateOptions *create_options, Error **errp) |
0eb4a8c1 | 2748 | { |
29ca9e45 | 2749 | BlockdevCreateOptionsQcow2 *qcow2_opts; |
0eb4a8c1 SH |
2750 | QDict *options; |
2751 | ||
a9420734 KW |
2752 | /* |
2753 | * Open the image file and write a minimal qcow2 header. | |
2754 | * | |
2755 | * We keep things simple and start with a zero-sized image. We also | |
2756 | * do without refcount blocks or a L1 table for now. We'll fix the | |
2757 | * inconsistency later. | |
2758 | * | |
2759 | * We do need a refcount table because growing the refcount table means | |
2760 | * allocating two new refcount blocks - the seconds of which would be at | |
2761 | * 2 GB for 64k clusters, and we don't want to have a 2 GB initial file | |
2762 | * size for any qcow2 image. | |
2763 | */ | |
e1d74bc6 KW |
2764 | BlockBackend *blk = NULL; |
2765 | BlockDriverState *bs = NULL; | |
f8413b3c | 2766 | QCowHeader *header; |
29ca9e45 KW |
2767 | size_t cluster_size; |
2768 | int version; | |
2769 | int refcount_order; | |
b106ad91 | 2770 | uint64_t* refcount_table; |
3ef6c40a | 2771 | Error *local_err = NULL; |
a9420734 KW |
2772 | int ret; |
2773 | ||
29ca9e45 KW |
2774 | assert(create_options->driver == BLOCKDEV_DRIVER_QCOW2); |
2775 | qcow2_opts = &create_options->u.qcow2; | |
2776 | ||
e1d74bc6 KW |
2777 | bs = bdrv_open_blockdev_ref(qcow2_opts->file, errp); |
2778 | if (bs == NULL) { | |
2779 | return -EIO; | |
2780 | } | |
2781 | ||
2782 | /* Validate options and set default values */ | |
29ca9e45 KW |
2783 | if (!QEMU_IS_ALIGNED(qcow2_opts->size, BDRV_SECTOR_SIZE)) { |
2784 | error_setg(errp, "Image size must be a multiple of 512 bytes"); | |
2785 | ret = -EINVAL; | |
2786 | goto out; | |
2787 | } | |
2788 | ||
2789 | if (qcow2_opts->has_version) { | |
2790 | switch (qcow2_opts->version) { | |
2791 | case BLOCKDEV_QCOW2_VERSION_V2: | |
2792 | version = 2; | |
2793 | break; | |
2794 | case BLOCKDEV_QCOW2_VERSION_V3: | |
2795 | version = 3; | |
2796 | break; | |
2797 | default: | |
2798 | g_assert_not_reached(); | |
2799 | } | |
2800 | } else { | |
2801 | version = 3; | |
2802 | } | |
2803 | ||
2804 | if (qcow2_opts->has_cluster_size) { | |
2805 | cluster_size = qcow2_opts->cluster_size; | |
2806 | } else { | |
2807 | cluster_size = DEFAULT_CLUSTER_SIZE; | |
2808 | } | |
2809 | ||
2810 | if (!validate_cluster_size(cluster_size, errp)) { | |
e1d74bc6 KW |
2811 | ret = -EINVAL; |
2812 | goto out; | |
29ca9e45 KW |
2813 | } |
2814 | ||
2815 | if (!qcow2_opts->has_preallocation) { | |
2816 | qcow2_opts->preallocation = PREALLOC_MODE_OFF; | |
2817 | } | |
2818 | if (qcow2_opts->has_backing_file && | |
2819 | qcow2_opts->preallocation != PREALLOC_MODE_OFF) | |
2820 | { | |
2821 | error_setg(errp, "Backing file and preallocation cannot be used at " | |
2822 | "the same time"); | |
e1d74bc6 KW |
2823 | ret = -EINVAL; |
2824 | goto out; | |
29ca9e45 KW |
2825 | } |
2826 | if (qcow2_opts->has_backing_fmt && !qcow2_opts->has_backing_file) { | |
2827 | error_setg(errp, "Backing format cannot be used without backing file"); | |
e1d74bc6 KW |
2828 | ret = -EINVAL; |
2829 | goto out; | |
29ca9e45 KW |
2830 | } |
2831 | ||
2832 | if (!qcow2_opts->has_lazy_refcounts) { | |
2833 | qcow2_opts->lazy_refcounts = false; | |
2834 | } | |
2835 | if (version < 3 && qcow2_opts->lazy_refcounts) { | |
2836 | error_setg(errp, "Lazy refcounts only supported with compatibility " | |
b76b4f60 | 2837 | "level 1.1 and above (use version=v3 or greater)"); |
e1d74bc6 KW |
2838 | ret = -EINVAL; |
2839 | goto out; | |
29ca9e45 KW |
2840 | } |
2841 | ||
2842 | if (!qcow2_opts->has_refcount_bits) { | |
2843 | qcow2_opts->refcount_bits = 16; | |
2844 | } | |
2845 | if (qcow2_opts->refcount_bits > 64 || | |
2846 | !is_power_of_2(qcow2_opts->refcount_bits)) | |
2847 | { | |
2848 | error_setg(errp, "Refcount width must be a power of two and may not " | |
2849 | "exceed 64 bits"); | |
e1d74bc6 KW |
2850 | ret = -EINVAL; |
2851 | goto out; | |
29ca9e45 KW |
2852 | } |
2853 | if (version < 3 && qcow2_opts->refcount_bits != 16) { | |
2854 | error_setg(errp, "Different refcount widths than 16 bits require " | |
b76b4f60 | 2855 | "compatibility level 1.1 or above (use version=v3 or " |
29ca9e45 | 2856 | "greater)"); |
e1d74bc6 KW |
2857 | ret = -EINVAL; |
2858 | goto out; | |
29ca9e45 KW |
2859 | } |
2860 | refcount_order = ctz32(qcow2_opts->refcount_bits); | |
2861 | ||
2862 | ||
2863 | /* Create BlockBackend to write to the image */ | |
cbf2b7c4 KW |
2864 | blk = blk_new(BLK_PERM_WRITE | BLK_PERM_RESIZE, BLK_PERM_ALL); |
2865 | ret = blk_insert_bs(blk, bs, errp); | |
a9420734 | 2866 | if (ret < 0) { |
cbf2b7c4 | 2867 | goto out; |
a9420734 | 2868 | } |
23588797 KW |
2869 | blk_set_allow_write_beyond_eof(blk, true); |
2870 | ||
e4b5dad8 KW |
2871 | /* Clear the protocol layer and preallocate it if necessary */ |
2872 | ret = blk_truncate(blk, 0, PREALLOC_MODE_OFF, errp); | |
2873 | if (ret < 0) { | |
2874 | goto out; | |
2875 | } | |
2876 | ||
2877 | if (qcow2_opts->preallocation == PREALLOC_MODE_FULL || | |
2878 | qcow2_opts->preallocation == PREALLOC_MODE_FALLOC) | |
2879 | { | |
2880 | int64_t prealloc_size = | |
2881 | qcow2_calc_prealloc_size(qcow2_opts->size, cluster_size, | |
2882 | refcount_order); | |
2883 | ||
2884 | ret = blk_truncate(blk, prealloc_size, qcow2_opts->preallocation, errp); | |
2885 | if (ret < 0) { | |
2886 | goto out; | |
2887 | } | |
2888 | } | |
2889 | ||
a9420734 | 2890 | /* Write the header */ |
f8413b3c KW |
2891 | QEMU_BUILD_BUG_ON((1 << MIN_CLUSTER_BITS) < sizeof(*header)); |
2892 | header = g_malloc0(cluster_size); | |
2893 | *header = (QCowHeader) { | |
2894 | .magic = cpu_to_be32(QCOW_MAGIC), | |
2895 | .version = cpu_to_be32(version), | |
0eb4a8c1 | 2896 | .cluster_bits = cpu_to_be32(ctz32(cluster_size)), |
f8413b3c KW |
2897 | .size = cpu_to_be64(0), |
2898 | .l1_table_offset = cpu_to_be64(0), | |
2899 | .l1_size = cpu_to_be32(0), | |
2900 | .refcount_table_offset = cpu_to_be64(cluster_size), | |
2901 | .refcount_table_clusters = cpu_to_be32(1), | |
bd4b167f | 2902 | .refcount_order = cpu_to_be32(refcount_order), |
f8413b3c KW |
2903 | .header_length = cpu_to_be32(sizeof(*header)), |
2904 | }; | |
a9420734 | 2905 | |
b25b387f DB |
2906 | /* We'll update this to correct value later */ |
2907 | header->crypt_method = cpu_to_be32(QCOW_CRYPT_NONE); | |
a9420734 | 2908 | |
29ca9e45 | 2909 | if (qcow2_opts->lazy_refcounts) { |
f8413b3c | 2910 | header->compatible_features |= |
bfe8043e SH |
2911 | cpu_to_be64(QCOW2_COMPAT_LAZY_REFCOUNTS); |
2912 | } | |
2913 | ||
8341f00d | 2914 | ret = blk_pwrite(blk, 0, header, cluster_size, 0); |
f8413b3c | 2915 | g_free(header); |
a9420734 | 2916 | if (ret < 0) { |
3ef6c40a | 2917 | error_setg_errno(errp, -ret, "Could not write qcow2 header"); |
a9420734 KW |
2918 | goto out; |
2919 | } | |
2920 | ||
b106ad91 KW |
2921 | /* Write a refcount table with one refcount block */ |
2922 | refcount_table = g_malloc0(2 * cluster_size); | |
2923 | refcount_table[0] = cpu_to_be64(2 * cluster_size); | |
8341f00d | 2924 | ret = blk_pwrite(blk, cluster_size, refcount_table, 2 * cluster_size, 0); |
7267c094 | 2925 | g_free(refcount_table); |
a9420734 KW |
2926 | |
2927 | if (ret < 0) { | |
3ef6c40a | 2928 | error_setg_errno(errp, -ret, "Could not write refcount table"); |
a9420734 KW |
2929 | goto out; |
2930 | } | |
2931 | ||
23588797 KW |
2932 | blk_unref(blk); |
2933 | blk = NULL; | |
a9420734 KW |
2934 | |
2935 | /* | |
2936 | * And now open the image and make it consistent first (i.e. increase the | |
2937 | * refcount of the cluster that is occupied by the header and the refcount | |
2938 | * table) | |
2939 | */ | |
e6641719 | 2940 | options = qdict_new(); |
46f5ac20 | 2941 | qdict_put_str(options, "driver", "qcow2"); |
cbf2b7c4 KW |
2942 | qdict_put_str(options, "file", bs->node_name); |
2943 | blk = blk_new_open(NULL, NULL, options, | |
55880601 KW |
2944 | BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_NO_FLUSH, |
2945 | &local_err); | |
23588797 | 2946 | if (blk == NULL) { |
3ef6c40a | 2947 | error_propagate(errp, local_err); |
23588797 | 2948 | ret = -EIO; |
a9420734 KW |
2949 | goto out; |
2950 | } | |
2951 | ||
23588797 | 2952 | ret = qcow2_alloc_clusters(blk_bs(blk), 3 * cluster_size); |
a9420734 | 2953 | if (ret < 0) { |
3ef6c40a HR |
2954 | error_setg_errno(errp, -ret, "Could not allocate clusters for qcow2 " |
2955 | "header and refcount table"); | |
a9420734 KW |
2956 | goto out; |
2957 | ||
2958 | } else if (ret != 0) { | |
2959 | error_report("Huh, first cluster in empty image is already in use?"); | |
2960 | abort(); | |
2961 | } | |
2962 | ||
b527c9b3 | 2963 | /* Create a full header (including things like feature table) */ |
23588797 | 2964 | ret = qcow2_update_header(blk_bs(blk)); |
b527c9b3 KW |
2965 | if (ret < 0) { |
2966 | error_setg_errno(errp, -ret, "Could not update qcow2 header"); | |
2967 | goto out; | |
2968 | } | |
2969 | ||
a9420734 | 2970 | /* Okay, now that we have a valid image, let's give it the right size */ |
29ca9e45 | 2971 | ret = blk_truncate(blk, qcow2_opts->size, PREALLOC_MODE_OFF, errp); |
a9420734 | 2972 | if (ret < 0) { |
ed3d2ec9 | 2973 | error_prepend(errp, "Could not resize image: "); |
a9420734 KW |
2974 | goto out; |
2975 | } | |
2976 | ||
2977 | /* Want a backing file? There you go.*/ | |
29ca9e45 KW |
2978 | if (qcow2_opts->has_backing_file) { |
2979 | const char *backing_format = NULL; | |
2980 | ||
2981 | if (qcow2_opts->has_backing_fmt) { | |
2982 | backing_format = BlockdevDriver_str(qcow2_opts->backing_fmt); | |
2983 | } | |
2984 | ||
2985 | ret = bdrv_change_backing_file(blk_bs(blk), qcow2_opts->backing_file, | |
2986 | backing_format); | |
a9420734 | 2987 | if (ret < 0) { |
3ef6c40a | 2988 | error_setg_errno(errp, -ret, "Could not assign backing file '%s' " |
29ca9e45 KW |
2989 | "with format '%s'", qcow2_opts->backing_file, |
2990 | backing_format); | |
a9420734 KW |
2991 | goto out; |
2992 | } | |
2993 | } | |
2994 | ||
b25b387f | 2995 | /* Want encryption? There you go. */ |
60900b7b KW |
2996 | if (qcow2_opts->has_encrypt) { |
2997 | ret = qcow2_set_up_encryption(blk_bs(blk), qcow2_opts->encrypt, errp); | |
b25b387f DB |
2998 | if (ret < 0) { |
2999 | goto out; | |
3000 | } | |
3001 | } | |
3002 | ||
a9420734 | 3003 | /* And if we're supposed to preallocate metadata, do that now */ |
29ca9e45 | 3004 | if (qcow2_opts->preallocation != PREALLOC_MODE_OFF) { |
061ca8a3 KW |
3005 | BDRVQcow2State *s = blk_bs(blk)->opaque; |
3006 | qemu_co_mutex_lock(&s->lock); | |
47e86b86 | 3007 | ret = preallocate_co(blk_bs(blk), 0, qcow2_opts->size); |
061ca8a3 KW |
3008 | qemu_co_mutex_unlock(&s->lock); |
3009 | ||
a9420734 | 3010 | if (ret < 0) { |
3ef6c40a | 3011 | error_setg_errno(errp, -ret, "Could not preallocate metadata"); |
a9420734 KW |
3012 | goto out; |
3013 | } | |
3014 | } | |
3015 | ||
23588797 KW |
3016 | blk_unref(blk); |
3017 | blk = NULL; | |
ba2ab2f2 | 3018 | |
b25b387f DB |
3019 | /* Reopen the image without BDRV_O_NO_FLUSH to flush it before returning. |
3020 | * Using BDRV_O_NO_IO, since encryption is now setup we don't want to | |
3021 | * have to setup decryption context. We're not doing any I/O on the top | |
3022 | * level BlockDriverState, only lower layers, where BDRV_O_NO_IO does | |
3023 | * not have effect. | |
3024 | */ | |
e6641719 | 3025 | options = qdict_new(); |
46f5ac20 | 3026 | qdict_put_str(options, "driver", "qcow2"); |
cbf2b7c4 KW |
3027 | qdict_put_str(options, "file", bs->node_name); |
3028 | blk = blk_new_open(NULL, NULL, options, | |
b25b387f DB |
3029 | BDRV_O_RDWR | BDRV_O_NO_BACKING | BDRV_O_NO_IO, |
3030 | &local_err); | |
23588797 | 3031 | if (blk == NULL) { |
ba2ab2f2 | 3032 | error_propagate(errp, local_err); |
23588797 | 3033 | ret = -EIO; |
ba2ab2f2 HR |
3034 | goto out; |
3035 | } | |
3036 | ||
a9420734 KW |
3037 | ret = 0; |
3038 | out: | |
e1d74bc6 KW |
3039 | blk_unref(blk); |
3040 | bdrv_unref(bs); | |
a9420734 KW |
3041 | return ret; |
3042 | } | |
de5f3f40 | 3043 | |
efc75e2a SH |
3044 | static int coroutine_fn qcow2_co_create_opts(const char *filename, QemuOpts *opts, |
3045 | Error **errp) | |
de5f3f40 | 3046 | { |
b76b4f60 | 3047 | BlockdevCreateOptions *create_options = NULL; |
92adf9db | 3048 | QDict *qdict; |
b76b4f60 | 3049 | Visitor *v; |
cbf2b7c4 | 3050 | BlockDriverState *bs = NULL; |
3ef6c40a | 3051 | Error *local_err = NULL; |
b76b4f60 | 3052 | const char *val; |
3ef6c40a | 3053 | int ret; |
de5f3f40 | 3054 | |
b76b4f60 KW |
3055 | /* Only the keyval visitor supports the dotted syntax needed for |
3056 | * encryption, so go through a QDict before getting a QAPI type. Ignore | |
3057 | * options meant for the protocol layer so that the visitor doesn't | |
3058 | * complain. */ | |
3059 | qdict = qemu_opts_to_qdict_filtered(opts, NULL, bdrv_qcow2.create_opts, | |
3060 | true); | |
3061 | ||
3062 | /* Handle encryption options */ | |
3063 | val = qdict_get_try_str(qdict, BLOCK_OPT_ENCRYPT); | |
3064 | if (val && !strcmp(val, "on")) { | |
3065 | qdict_put_str(qdict, BLOCK_OPT_ENCRYPT, "qcow"); | |
3066 | } else if (val && !strcmp(val, "off")) { | |
3067 | qdict_del(qdict, BLOCK_OPT_ENCRYPT); | |
3068 | } | |
3069 | ||
3070 | val = qdict_get_try_str(qdict, BLOCK_OPT_ENCRYPT_FORMAT); | |
3071 | if (val && !strcmp(val, "aes")) { | |
3072 | qdict_put_str(qdict, BLOCK_OPT_ENCRYPT_FORMAT, "qcow"); | |
3073 | } | |
3074 | ||
3075 | /* Convert compat=0.10/1.1 into compat=v2/v3, to be renamed into | |
3076 | * version=v2/v3 below. */ | |
3077 | val = qdict_get_try_str(qdict, BLOCK_OPT_COMPAT_LEVEL); | |
3078 | if (val && !strcmp(val, "0.10")) { | |
3079 | qdict_put_str(qdict, BLOCK_OPT_COMPAT_LEVEL, "v2"); | |
3080 | } else if (val && !strcmp(val, "1.1")) { | |
3081 | qdict_put_str(qdict, BLOCK_OPT_COMPAT_LEVEL, "v3"); | |
3082 | } | |
3083 | ||
3084 | /* Change legacy command line options into QMP ones */ | |
3085 | static const QDictRenames opt_renames[] = { | |
3086 | { BLOCK_OPT_BACKING_FILE, "backing-file" }, | |
3087 | { BLOCK_OPT_BACKING_FMT, "backing-fmt" }, | |
3088 | { BLOCK_OPT_CLUSTER_SIZE, "cluster-size" }, | |
3089 | { BLOCK_OPT_LAZY_REFCOUNTS, "lazy-refcounts" }, | |
3090 | { BLOCK_OPT_REFCOUNT_BITS, "refcount-bits" }, | |
3091 | { BLOCK_OPT_ENCRYPT, BLOCK_OPT_ENCRYPT_FORMAT }, | |
3092 | { BLOCK_OPT_COMPAT_LEVEL, "version" }, | |
3093 | { NULL, NULL }, | |
3094 | }; | |
3095 | ||
3096 | if (!qdict_rename_keys(qdict, opt_renames, errp)) { | |
29ca9e45 KW |
3097 | ret = -EINVAL; |
3098 | goto finish; | |
3099 | } | |
60900b7b | 3100 | |
b76b4f60 KW |
3101 | /* Create and open the file (protocol layer) */ |
3102 | ret = bdrv_create_file(filename, opts, errp); | |
3103 | if (ret < 0) { | |
0eb4a8c1 SH |
3104 | goto finish; |
3105 | } | |
b76b4f60 KW |
3106 | |
3107 | bs = bdrv_open(filename, NULL, NULL, | |
3108 | BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, errp); | |
3109 | if (bs == NULL) { | |
3110 | ret = -EIO; | |
1bd0e2d1 CL |
3111 | goto finish; |
3112 | } | |
0eb4a8c1 | 3113 | |
b76b4f60 KW |
3114 | /* Set 'driver' and 'node' options */ |
3115 | qdict_put_str(qdict, "driver", "qcow2"); | |
3116 | qdict_put_str(qdict, "file", bs->node_name); | |
3117 | ||
3118 | /* Now get the QAPI type BlockdevCreateOptions */ | |
af91062e MA |
3119 | v = qobject_input_visitor_new_flat_confused(qdict, errp); |
3120 | if (!v) { | |
1bd0e2d1 CL |
3121 | ret = -EINVAL; |
3122 | goto finish; | |
3123 | } | |
3124 | ||
b76b4f60 KW |
3125 | visit_type_BlockdevCreateOptions(v, NULL, &create_options, &local_err); |
3126 | visit_free(v); | |
de5f3f40 | 3127 | |
0eb4a8c1 SH |
3128 | if (local_err) { |
3129 | error_propagate(errp, local_err); | |
bd4b167f HR |
3130 | ret = -EINVAL; |
3131 | goto finish; | |
3132 | } | |
3133 | ||
b76b4f60 KW |
3134 | /* Silently round up size */ |
3135 | create_options->u.qcow2.size = ROUND_UP(create_options->u.qcow2.size, | |
3136 | BDRV_SECTOR_SIZE); | |
cbf2b7c4 KW |
3137 | |
3138 | /* Create the qcow2 image (format layer) */ | |
b76b4f60 | 3139 | ret = qcow2_co_create(create_options, errp); |
cbf2b7c4 KW |
3140 | if (ret < 0) { |
3141 | goto finish; | |
3142 | } | |
1bd0e2d1 | 3143 | |
b76b4f60 | 3144 | ret = 0; |
1bd0e2d1 | 3145 | finish: |
cb3e7f08 | 3146 | qobject_unref(qdict); |
cbf2b7c4 | 3147 | bdrv_unref(bs); |
b76b4f60 | 3148 | qapi_free_BlockdevCreateOptions(create_options); |
3ef6c40a | 3149 | return ret; |
de5f3f40 KW |
3150 | } |
3151 | ||
2928abce | 3152 | |
f06f6b66 | 3153 | static bool is_zero(BlockDriverState *bs, int64_t offset, int64_t bytes) |
2928abce | 3154 | { |
31826642 EB |
3155 | int64_t nr; |
3156 | int res; | |
f06f6b66 EB |
3157 | |
3158 | /* Clamp to image length, before checking status of underlying sectors */ | |
8cbf74b2 EB |
3159 | if (offset + bytes > bs->total_sectors * BDRV_SECTOR_SIZE) { |
3160 | bytes = bs->total_sectors * BDRV_SECTOR_SIZE - offset; | |
fbaa6bb3 EB |
3161 | } |
3162 | ||
f06f6b66 | 3163 | if (!bytes) { |
ebb718a5 EB |
3164 | return true; |
3165 | } | |
8cbf74b2 | 3166 | res = bdrv_block_status_above(bs, NULL, offset, bytes, &nr, NULL, NULL); |
31826642 | 3167 | return res >= 0 && (res & BDRV_BLOCK_ZERO) && nr == bytes; |
2928abce DL |
3168 | } |
3169 | ||
5544b59f | 3170 | static coroutine_fn int qcow2_co_pwrite_zeroes(BlockDriverState *bs, |
f5a5ca79 | 3171 | int64_t offset, int bytes, BdrvRequestFlags flags) |
621f0589 KW |
3172 | { |
3173 | int ret; | |
ff99129a | 3174 | BDRVQcow2State *s = bs->opaque; |
621f0589 | 3175 | |
5544b59f | 3176 | uint32_t head = offset % s->cluster_size; |
f5a5ca79 | 3177 | uint32_t tail = (offset + bytes) % s->cluster_size; |
2928abce | 3178 | |
f5a5ca79 MP |
3179 | trace_qcow2_pwrite_zeroes_start_req(qemu_coroutine_self(), offset, bytes); |
3180 | if (offset + bytes == bs->total_sectors * BDRV_SECTOR_SIZE) { | |
fbaa6bb3 EB |
3181 | tail = 0; |
3182 | } | |
5a64e942 | 3183 | |
ebb718a5 | 3184 | if (head || tail) { |
ebb718a5 | 3185 | uint64_t off; |
ecfe1863 | 3186 | unsigned int nr; |
2928abce | 3187 | |
f5a5ca79 | 3188 | assert(head + bytes <= s->cluster_size); |
2928abce | 3189 | |
ebb718a5 | 3190 | /* check whether remainder of cluster already reads as zero */ |
f06f6b66 EB |
3191 | if (!(is_zero(bs, offset - head, head) && |
3192 | is_zero(bs, offset + bytes, | |
3193 | tail ? s->cluster_size - tail : 0))) { | |
2928abce DL |
3194 | return -ENOTSUP; |
3195 | } | |
3196 | ||
2928abce DL |
3197 | qemu_co_mutex_lock(&s->lock); |
3198 | /* We can have new write after previous check */ | |
f06f6b66 | 3199 | offset = QEMU_ALIGN_DOWN(offset, s->cluster_size); |
f5a5ca79 | 3200 | bytes = s->cluster_size; |
ecfe1863 | 3201 | nr = s->cluster_size; |
5544b59f | 3202 | ret = qcow2_get_cluster_offset(bs, offset, &nr, &off); |
fdfab37d EB |
3203 | if (ret != QCOW2_CLUSTER_UNALLOCATED && |
3204 | ret != QCOW2_CLUSTER_ZERO_PLAIN && | |
3205 | ret != QCOW2_CLUSTER_ZERO_ALLOC) { | |
2928abce DL |
3206 | qemu_co_mutex_unlock(&s->lock); |
3207 | return -ENOTSUP; | |
3208 | } | |
3209 | } else { | |
3210 | qemu_co_mutex_lock(&s->lock); | |
621f0589 KW |
3211 | } |
3212 | ||
f5a5ca79 | 3213 | trace_qcow2_pwrite_zeroes(qemu_coroutine_self(), offset, bytes); |
5a64e942 | 3214 | |
621f0589 | 3215 | /* Whatever is left can use real zero clusters */ |
f5a5ca79 | 3216 | ret = qcow2_cluster_zeroize(bs, offset, bytes, flags); |
621f0589 KW |
3217 | qemu_co_mutex_unlock(&s->lock); |
3218 | ||
3219 | return ret; | |
3220 | } | |
3221 | ||
82e8a788 | 3222 | static coroutine_fn int qcow2_co_pdiscard(BlockDriverState *bs, |
f5a5ca79 | 3223 | int64_t offset, int bytes) |
5ea929e3 | 3224 | { |
6db39ae2 | 3225 | int ret; |
ff99129a | 3226 | BDRVQcow2State *s = bs->opaque; |
6db39ae2 | 3227 | |
f5a5ca79 MP |
3228 | if (!QEMU_IS_ALIGNED(offset | bytes, s->cluster_size)) { |
3229 | assert(bytes < s->cluster_size); | |
048c5fd1 EB |
3230 | /* Ignore partial clusters, except for the special case of the |
3231 | * complete partial cluster at the end of an unaligned file */ | |
3232 | if (!QEMU_IS_ALIGNED(offset, s->cluster_size) || | |
f5a5ca79 | 3233 | offset + bytes != bs->total_sectors * BDRV_SECTOR_SIZE) { |
048c5fd1 EB |
3234 | return -ENOTSUP; |
3235 | } | |
49228d1e EB |
3236 | } |
3237 | ||
6db39ae2 | 3238 | qemu_co_mutex_lock(&s->lock); |
f5a5ca79 | 3239 | ret = qcow2_cluster_discard(bs, offset, bytes, QCOW2_DISCARD_REQUEST, |
d2cb36af | 3240 | false); |
6db39ae2 PB |
3241 | qemu_co_mutex_unlock(&s->lock); |
3242 | return ret; | |
5ea929e3 KW |
3243 | } |
3244 | ||
fd9fcd37 FZ |
3245 | static int coroutine_fn |
3246 | qcow2_co_copy_range_from(BlockDriverState *bs, | |
3247 | BdrvChild *src, uint64_t src_offset, | |
3248 | BdrvChild *dst, uint64_t dst_offset, | |
3249 | uint64_t bytes, BdrvRequestFlags flags) | |
3250 | { | |
3251 | BDRVQcow2State *s = bs->opaque; | |
3252 | int ret; | |
3253 | unsigned int cur_bytes; /* number of bytes in current iteration */ | |
3254 | BdrvChild *child = NULL; | |
3255 | BdrvRequestFlags cur_flags; | |
3256 | ||
3257 | assert(!bs->encrypted); | |
3258 | qemu_co_mutex_lock(&s->lock); | |
3259 | ||
3260 | while (bytes != 0) { | |
3261 | uint64_t copy_offset = 0; | |
3262 | /* prepare next request */ | |
3263 | cur_bytes = MIN(bytes, INT_MAX); | |
3264 | cur_flags = flags; | |
3265 | ||
3266 | ret = qcow2_get_cluster_offset(bs, src_offset, &cur_bytes, ©_offset); | |
3267 | if (ret < 0) { | |
3268 | goto out; | |
3269 | } | |
3270 | ||
3271 | switch (ret) { | |
3272 | case QCOW2_CLUSTER_UNALLOCATED: | |
3273 | if (bs->backing && bs->backing->bs) { | |
3274 | int64_t backing_length = bdrv_getlength(bs->backing->bs); | |
3275 | if (src_offset >= backing_length) { | |
3276 | cur_flags |= BDRV_REQ_ZERO_WRITE; | |
3277 | } else { | |
3278 | child = bs->backing; | |
3279 | cur_bytes = MIN(cur_bytes, backing_length - src_offset); | |
3280 | copy_offset = src_offset; | |
3281 | } | |
3282 | } else { | |
3283 | cur_flags |= BDRV_REQ_ZERO_WRITE; | |
3284 | } | |
3285 | break; | |
3286 | ||
3287 | case QCOW2_CLUSTER_ZERO_PLAIN: | |
3288 | case QCOW2_CLUSTER_ZERO_ALLOC: | |
3289 | cur_flags |= BDRV_REQ_ZERO_WRITE; | |
3290 | break; | |
3291 | ||
3292 | case QCOW2_CLUSTER_COMPRESSED: | |
3293 | ret = -ENOTSUP; | |
3294 | goto out; | |
3295 | break; | |
3296 | ||
3297 | case QCOW2_CLUSTER_NORMAL: | |
3298 | child = bs->file; | |
3299 | copy_offset += offset_into_cluster(s, src_offset); | |
3300 | if ((copy_offset & 511) != 0) { | |
3301 | ret = -EIO; | |
3302 | goto out; | |
3303 | } | |
3304 | break; | |
3305 | ||
3306 | default: | |
3307 | abort(); | |
3308 | } | |
3309 | qemu_co_mutex_unlock(&s->lock); | |
3310 | ret = bdrv_co_copy_range_from(child, | |
3311 | copy_offset, | |
3312 | dst, dst_offset, | |
3313 | cur_bytes, cur_flags); | |
3314 | qemu_co_mutex_lock(&s->lock); | |
3315 | if (ret < 0) { | |
3316 | goto out; | |
3317 | } | |
3318 | ||
3319 | bytes -= cur_bytes; | |
3320 | src_offset += cur_bytes; | |
3321 | dst_offset += cur_bytes; | |
3322 | } | |
3323 | ret = 0; | |
3324 | ||
3325 | out: | |
3326 | qemu_co_mutex_unlock(&s->lock); | |
3327 | return ret; | |
3328 | } | |
3329 | ||
3330 | static int coroutine_fn | |
3331 | qcow2_co_copy_range_to(BlockDriverState *bs, | |
3332 | BdrvChild *src, uint64_t src_offset, | |
3333 | BdrvChild *dst, uint64_t dst_offset, | |
3334 | uint64_t bytes, BdrvRequestFlags flags) | |
3335 | { | |
3336 | BDRVQcow2State *s = bs->opaque; | |
3337 | int offset_in_cluster; | |
3338 | int ret; | |
3339 | unsigned int cur_bytes; /* number of sectors in current iteration */ | |
3340 | uint64_t cluster_offset; | |
3341 | uint8_t *cluster_data = NULL; | |
3342 | QCowL2Meta *l2meta = NULL; | |
3343 | ||
3344 | assert(!bs->encrypted); | |
3345 | s->cluster_cache_offset = -1; /* disable compressed cache */ | |
3346 | ||
3347 | qemu_co_mutex_lock(&s->lock); | |
3348 | ||
3349 | while (bytes != 0) { | |
3350 | ||
3351 | l2meta = NULL; | |
3352 | ||
3353 | offset_in_cluster = offset_into_cluster(s, dst_offset); | |
3354 | cur_bytes = MIN(bytes, INT_MAX); | |
3355 | ||
3356 | /* TODO: | |
3357 | * If src->bs == dst->bs, we could simply copy by incrementing | |
3358 | * the refcnt, without copying user data. | |
3359 | * Or if src->bs == dst->bs->backing->bs, we could copy by discarding. */ | |
3360 | ret = qcow2_alloc_cluster_offset(bs, dst_offset, &cur_bytes, | |
3361 | &cluster_offset, &l2meta); | |
3362 | if (ret < 0) { | |
3363 | goto fail; | |
3364 | } | |
3365 | ||
3366 | assert((cluster_offset & 511) == 0); | |
3367 | ||
3368 | ret = qcow2_pre_write_overlap_check(bs, 0, | |
3369 | cluster_offset + offset_in_cluster, cur_bytes); | |
3370 | if (ret < 0) { | |
3371 | goto fail; | |
3372 | } | |
3373 | ||
3374 | qemu_co_mutex_unlock(&s->lock); | |
3375 | ret = bdrv_co_copy_range_to(src, src_offset, | |
3376 | bs->file, | |
3377 | cluster_offset + offset_in_cluster, | |
3378 | cur_bytes, flags); | |
3379 | qemu_co_mutex_lock(&s->lock); | |
3380 | if (ret < 0) { | |
3381 | goto fail; | |
3382 | } | |
3383 | ||
3384 | ret = qcow2_handle_l2meta(bs, &l2meta, true); | |
3385 | if (ret) { | |
3386 | goto fail; | |
3387 | } | |
3388 | ||
3389 | bytes -= cur_bytes; | |
3390 | dst_offset += cur_bytes; | |
3391 | } | |
3392 | ret = 0; | |
3393 | ||
3394 | fail: | |
3395 | qcow2_handle_l2meta(bs, &l2meta, false); | |
3396 | ||
3397 | qemu_co_mutex_unlock(&s->lock); | |
3398 | ||
3399 | qemu_vfree(cluster_data); | |
3400 | trace_qcow2_writev_done_req(qemu_coroutine_self(), ret); | |
3401 | ||
3402 | return ret; | |
3403 | } | |
3404 | ||
061ca8a3 KW |
3405 | static int coroutine_fn qcow2_co_truncate(BlockDriverState *bs, int64_t offset, |
3406 | PreallocMode prealloc, Error **errp) | |
419b19d9 | 3407 | { |
ff99129a | 3408 | BDRVQcow2State *s = bs->opaque; |
95b98f34 | 3409 | uint64_t old_length; |
2cf7cfa1 KW |
3410 | int64_t new_l1_size; |
3411 | int ret; | |
419b19d9 | 3412 | |
772d1f97 HR |
3413 | if (prealloc != PREALLOC_MODE_OFF && prealloc != PREALLOC_MODE_METADATA && |
3414 | prealloc != PREALLOC_MODE_FALLOC && prealloc != PREALLOC_MODE_FULL) | |
3415 | { | |
8243ccb7 | 3416 | error_setg(errp, "Unsupported preallocation mode '%s'", |
977c736f | 3417 | PreallocMode_str(prealloc)); |
8243ccb7 HR |
3418 | return -ENOTSUP; |
3419 | } | |
3420 | ||
419b19d9 | 3421 | if (offset & 511) { |
4bff28b8 | 3422 | error_setg(errp, "The new size must be a multiple of 512"); |
419b19d9 SH |
3423 | return -EINVAL; |
3424 | } | |
3425 | ||
061ca8a3 KW |
3426 | qemu_co_mutex_lock(&s->lock); |
3427 | ||
419b19d9 SH |
3428 | /* cannot proceed if image has snapshots */ |
3429 | if (s->nb_snapshots) { | |
4bff28b8 | 3430 | error_setg(errp, "Can't resize an image which has snapshots"); |
061ca8a3 KW |
3431 | ret = -ENOTSUP; |
3432 | goto fail; | |
419b19d9 SH |
3433 | } |
3434 | ||
88ddffae VSO |
3435 | /* cannot proceed if image has bitmaps */ |
3436 | if (s->nb_bitmaps) { | |
3437 | /* TODO: resize bitmaps in the image */ | |
3438 | error_setg(errp, "Can't resize an image which has bitmaps"); | |
061ca8a3 KW |
3439 | ret = -ENOTSUP; |
3440 | goto fail; | |
88ddffae VSO |
3441 | } |
3442 | ||
95b98f34 | 3443 | old_length = bs->total_sectors * 512; |
46b732cd | 3444 | new_l1_size = size_to_l1(s, offset); |
95b98f34 | 3445 | |
95b98f34 | 3446 | if (offset < old_length) { |
163bc39d | 3447 | int64_t last_cluster, old_file_size; |
46b732cd PB |
3448 | if (prealloc != PREALLOC_MODE_OFF) { |
3449 | error_setg(errp, | |
3450 | "Preallocation can't be used for shrinking an image"); | |
061ca8a3 KW |
3451 | ret = -EINVAL; |
3452 | goto fail; | |
46b732cd | 3453 | } |
419b19d9 | 3454 | |
46b732cd PB |
3455 | ret = qcow2_cluster_discard(bs, ROUND_UP(offset, s->cluster_size), |
3456 | old_length - ROUND_UP(offset, | |
3457 | s->cluster_size), | |
3458 | QCOW2_DISCARD_ALWAYS, true); | |
3459 | if (ret < 0) { | |
3460 | error_setg_errno(errp, -ret, "Failed to discard cropped clusters"); | |
061ca8a3 | 3461 | goto fail; |
46b732cd PB |
3462 | } |
3463 | ||
3464 | ret = qcow2_shrink_l1_table(bs, new_l1_size); | |
3465 | if (ret < 0) { | |
3466 | error_setg_errno(errp, -ret, | |
3467 | "Failed to reduce the number of L2 tables"); | |
061ca8a3 | 3468 | goto fail; |
46b732cd PB |
3469 | } |
3470 | ||
3471 | ret = qcow2_shrink_reftable(bs); | |
3472 | if (ret < 0) { | |
3473 | error_setg_errno(errp, -ret, | |
3474 | "Failed to discard unused refblocks"); | |
061ca8a3 | 3475 | goto fail; |
46b732cd | 3476 | } |
163bc39d PB |
3477 | |
3478 | old_file_size = bdrv_getlength(bs->file->bs); | |
3479 | if (old_file_size < 0) { | |
3480 | error_setg_errno(errp, -old_file_size, | |
3481 | "Failed to inquire current file length"); | |
061ca8a3 KW |
3482 | ret = old_file_size; |
3483 | goto fail; | |
163bc39d PB |
3484 | } |
3485 | last_cluster = qcow2_get_last_cluster(bs, old_file_size); | |
3486 | if (last_cluster < 0) { | |
3487 | error_setg_errno(errp, -last_cluster, | |
3488 | "Failed to find the last cluster"); | |
061ca8a3 KW |
3489 | ret = last_cluster; |
3490 | goto fail; | |
163bc39d PB |
3491 | } |
3492 | if ((last_cluster + 1) * s->cluster_size < old_file_size) { | |
233521b1 HR |
3493 | Error *local_err = NULL; |
3494 | ||
061ca8a3 KW |
3495 | bdrv_co_truncate(bs->file, (last_cluster + 1) * s->cluster_size, |
3496 | PREALLOC_MODE_OFF, &local_err); | |
233521b1 HR |
3497 | if (local_err) { |
3498 | warn_reportf_err(local_err, | |
3499 | "Failed to truncate the tail of the image: "); | |
163bc39d PB |
3500 | } |
3501 | } | |
46b732cd PB |
3502 | } else { |
3503 | ret = qcow2_grow_l1_table(bs, new_l1_size, true); | |
3504 | if (ret < 0) { | |
3505 | error_setg_errno(errp, -ret, "Failed to grow the L1 table"); | |
061ca8a3 | 3506 | goto fail; |
46b732cd | 3507 | } |
419b19d9 SH |
3508 | } |
3509 | ||
95b98f34 HR |
3510 | switch (prealloc) { |
3511 | case PREALLOC_MODE_OFF: | |
3512 | break; | |
3513 | ||
3514 | case PREALLOC_MODE_METADATA: | |
47e86b86 | 3515 | ret = preallocate_co(bs, old_length, offset); |
95b98f34 HR |
3516 | if (ret < 0) { |
3517 | error_setg_errno(errp, -ret, "Preallocation failed"); | |
061ca8a3 | 3518 | goto fail; |
95b98f34 HR |
3519 | } |
3520 | break; | |
3521 | ||
772d1f97 HR |
3522 | case PREALLOC_MODE_FALLOC: |
3523 | case PREALLOC_MODE_FULL: | |
3524 | { | |
3525 | int64_t allocation_start, host_offset, guest_offset; | |
3526 | int64_t clusters_allocated; | |
3527 | int64_t old_file_size, new_file_size; | |
3528 | uint64_t nb_new_data_clusters, nb_new_l2_tables; | |
3529 | ||
3530 | old_file_size = bdrv_getlength(bs->file->bs); | |
3531 | if (old_file_size < 0) { | |
3532 | error_setg_errno(errp, -old_file_size, | |
3533 | "Failed to inquire current file length"); | |
061ca8a3 KW |
3534 | ret = old_file_size; |
3535 | goto fail; | |
772d1f97 | 3536 | } |
e400ad1e | 3537 | old_file_size = ROUND_UP(old_file_size, s->cluster_size); |
772d1f97 HR |
3538 | |
3539 | nb_new_data_clusters = DIV_ROUND_UP(offset - old_length, | |
3540 | s->cluster_size); | |
3541 | ||
3542 | /* This is an overestimation; we will not actually allocate space for | |
3543 | * these in the file but just make sure the new refcount structures are | |
3544 | * able to cover them so we will not have to allocate new refblocks | |
3545 | * while entering the data blocks in the potentially new L2 tables. | |
3546 | * (We do not actually care where the L2 tables are placed. Maybe they | |
3547 | * are already allocated or they can be placed somewhere before | |
3548 | * @old_file_size. It does not matter because they will be fully | |
3549 | * allocated automatically, so they do not need to be covered by the | |
3550 | * preallocation. All that matters is that we will not have to allocate | |
3551 | * new refcount structures for them.) */ | |
3552 | nb_new_l2_tables = DIV_ROUND_UP(nb_new_data_clusters, | |
3553 | s->cluster_size / sizeof(uint64_t)); | |
3554 | /* The cluster range may not be aligned to L2 boundaries, so add one L2 | |
3555 | * table for a potential head/tail */ | |
3556 | nb_new_l2_tables++; | |
3557 | ||
3558 | allocation_start = qcow2_refcount_area(bs, old_file_size, | |
3559 | nb_new_data_clusters + | |
3560 | nb_new_l2_tables, | |
3561 | true, 0, 0); | |
3562 | if (allocation_start < 0) { | |
3563 | error_setg_errno(errp, -allocation_start, | |
3564 | "Failed to resize refcount structures"); | |
061ca8a3 KW |
3565 | ret = allocation_start; |
3566 | goto fail; | |
772d1f97 HR |
3567 | } |
3568 | ||
3569 | clusters_allocated = qcow2_alloc_clusters_at(bs, allocation_start, | |
3570 | nb_new_data_clusters); | |
3571 | if (clusters_allocated < 0) { | |
3572 | error_setg_errno(errp, -clusters_allocated, | |
3573 | "Failed to allocate data clusters"); | |
061ca8a3 KW |
3574 | ret = clusters_allocated; |
3575 | goto fail; | |
772d1f97 HR |
3576 | } |
3577 | ||
3578 | assert(clusters_allocated == nb_new_data_clusters); | |
3579 | ||
3580 | /* Allocate the data area */ | |
3581 | new_file_size = allocation_start + | |
3582 | nb_new_data_clusters * s->cluster_size; | |
061ca8a3 | 3583 | ret = bdrv_co_truncate(bs->file, new_file_size, prealloc, errp); |
772d1f97 HR |
3584 | if (ret < 0) { |
3585 | error_prepend(errp, "Failed to resize underlying file: "); | |
3586 | qcow2_free_clusters(bs, allocation_start, | |
3587 | nb_new_data_clusters * s->cluster_size, | |
3588 | QCOW2_DISCARD_OTHER); | |
061ca8a3 | 3589 | goto fail; |
772d1f97 HR |
3590 | } |
3591 | ||
3592 | /* Create the necessary L2 entries */ | |
3593 | host_offset = allocation_start; | |
3594 | guest_offset = old_length; | |
3595 | while (nb_new_data_clusters) { | |
13bec229 AG |
3596 | int64_t nb_clusters = MIN( |
3597 | nb_new_data_clusters, | |
3598 | s->l2_slice_size - offset_to_l2_slice_index(s, guest_offset)); | |
772d1f97 HR |
3599 | QCowL2Meta allocation = { |
3600 | .offset = guest_offset, | |
3601 | .alloc_offset = host_offset, | |
3602 | .nb_clusters = nb_clusters, | |
3603 | }; | |
3604 | qemu_co_queue_init(&allocation.dependent_requests); | |
3605 | ||
3606 | ret = qcow2_alloc_cluster_link_l2(bs, &allocation); | |
3607 | if (ret < 0) { | |
3608 | error_setg_errno(errp, -ret, "Failed to update L2 tables"); | |
3609 | qcow2_free_clusters(bs, host_offset, | |
3610 | nb_new_data_clusters * s->cluster_size, | |
3611 | QCOW2_DISCARD_OTHER); | |
061ca8a3 | 3612 | goto fail; |
772d1f97 HR |
3613 | } |
3614 | ||
3615 | guest_offset += nb_clusters * s->cluster_size; | |
3616 | host_offset += nb_clusters * s->cluster_size; | |
3617 | nb_new_data_clusters -= nb_clusters; | |
3618 | } | |
3619 | break; | |
3620 | } | |
3621 | ||
95b98f34 HR |
3622 | default: |
3623 | g_assert_not_reached(); | |
3624 | } | |
3625 | ||
3626 | if (prealloc != PREALLOC_MODE_OFF) { | |
3627 | /* Flush metadata before actually changing the image size */ | |
061ca8a3 | 3628 | ret = qcow2_write_caches(bs); |
95b98f34 HR |
3629 | if (ret < 0) { |
3630 | error_setg_errno(errp, -ret, | |
3631 | "Failed to flush the preallocated area to disk"); | |
061ca8a3 | 3632 | goto fail; |
95b98f34 HR |
3633 | } |
3634 | } | |
3635 | ||
419b19d9 SH |
3636 | /* write updated header.size */ |
3637 | offset = cpu_to_be64(offset); | |
d9ca2ea2 | 3638 | ret = bdrv_pwrite_sync(bs->file, offsetof(QCowHeader, size), |
8b3b7206 | 3639 | &offset, sizeof(uint64_t)); |
419b19d9 | 3640 | if (ret < 0) { |
f59adb32 | 3641 | error_setg_errno(errp, -ret, "Failed to update the image size"); |
061ca8a3 | 3642 | goto fail; |
419b19d9 SH |
3643 | } |
3644 | ||
3645 | s->l1_vm_state_index = new_l1_size; | |
061ca8a3 KW |
3646 | ret = 0; |
3647 | fail: | |
3648 | qemu_co_mutex_unlock(&s->lock); | |
3649 | return ret; | |
419b19d9 SH |
3650 | } |
3651 | ||
20d97356 BS |
3652 | /* XXX: put compressed sectors first, then all the cluster aligned |
3653 | tables to avoid losing bytes in alignment */ | |
fcccefc5 PB |
3654 | static coroutine_fn int |
3655 | qcow2_co_pwritev_compressed(BlockDriverState *bs, uint64_t offset, | |
3656 | uint64_t bytes, QEMUIOVector *qiov) | |
20d97356 | 3657 | { |
ff99129a | 3658 | BDRVQcow2State *s = bs->opaque; |
fcccefc5 PB |
3659 | QEMUIOVector hd_qiov; |
3660 | struct iovec iov; | |
20d97356 BS |
3661 | z_stream strm; |
3662 | int ret, out_len; | |
fcccefc5 | 3663 | uint8_t *buf, *out_buf; |
d0d5d0e3 | 3664 | int64_t cluster_offset; |
20d97356 | 3665 | |
fcccefc5 | 3666 | if (bytes == 0) { |
20d97356 BS |
3667 | /* align end of file to a sector boundary to ease reading with |
3668 | sector based I/Os */ | |
9a4f4c31 | 3669 | cluster_offset = bdrv_getlength(bs->file->bs); |
d0d5d0e3 EB |
3670 | if (cluster_offset < 0) { |
3671 | return cluster_offset; | |
3672 | } | |
061ca8a3 KW |
3673 | return bdrv_co_truncate(bs->file, cluster_offset, PREALLOC_MODE_OFF, |
3674 | NULL); | |
20d97356 BS |
3675 | } |
3676 | ||
3e3b838f AN |
3677 | if (offset_into_cluster(s, offset)) { |
3678 | return -EINVAL; | |
3679 | } | |
3680 | ||
a2c0ca6f | 3681 | buf = qemu_blockalign(bs, s->cluster_size); |
fcccefc5 | 3682 | if (bytes != s->cluster_size) { |
a2c0ca6f PB |
3683 | if (bytes > s->cluster_size || |
3684 | offset + bytes != bs->total_sectors << BDRV_SECTOR_BITS) | |
fcccefc5 | 3685 | { |
a2c0ca6f PB |
3686 | qemu_vfree(buf); |
3687 | return -EINVAL; | |
f4d38bef | 3688 | } |
a2c0ca6f PB |
3689 | /* Zero-pad last write if image size is not cluster aligned */ |
3690 | memset(buf + bytes, 0, s->cluster_size - bytes); | |
f4d38bef | 3691 | } |
8b2bd093 | 3692 | qemu_iovec_to_buf(qiov, 0, buf, bytes); |
20d97356 | 3693 | |
ebf7bba0 | 3694 | out_buf = g_malloc(s->cluster_size); |
20d97356 BS |
3695 | |
3696 | /* best compression, small window, no zlib header */ | |
3697 | memset(&strm, 0, sizeof(strm)); | |
3698 | ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION, | |
3699 | Z_DEFLATED, -12, | |
3700 | 9, Z_DEFAULT_STRATEGY); | |
3701 | if (ret != 0) { | |
8f1efd00 KW |
3702 | ret = -EINVAL; |
3703 | goto fail; | |
20d97356 BS |
3704 | } |
3705 | ||
3706 | strm.avail_in = s->cluster_size; | |
3707 | strm.next_in = (uint8_t *)buf; | |
3708 | strm.avail_out = s->cluster_size; | |
3709 | strm.next_out = out_buf; | |
3710 | ||
3711 | ret = deflate(&strm, Z_FINISH); | |
3712 | if (ret != Z_STREAM_END && ret != Z_OK) { | |
20d97356 | 3713 | deflateEnd(&strm); |
8f1efd00 KW |
3714 | ret = -EINVAL; |
3715 | goto fail; | |
20d97356 BS |
3716 | } |
3717 | out_len = strm.next_out - out_buf; | |
3718 | ||
3719 | deflateEnd(&strm); | |
3720 | ||
3721 | if (ret != Z_STREAM_END || out_len >= s->cluster_size) { | |
3722 | /* could not compress: write normal cluster */ | |
fcccefc5 | 3723 | ret = qcow2_co_pwritev(bs, offset, bytes, qiov, 0); |
8f1efd00 KW |
3724 | if (ret < 0) { |
3725 | goto fail; | |
3726 | } | |
fcccefc5 PB |
3727 | goto success; |
3728 | } | |
cf93980e | 3729 | |
fcccefc5 PB |
3730 | qemu_co_mutex_lock(&s->lock); |
3731 | cluster_offset = | |
3732 | qcow2_alloc_compressed_cluster_offset(bs, offset, out_len); | |
3733 | if (!cluster_offset) { | |
3734 | qemu_co_mutex_unlock(&s->lock); | |
3735 | ret = -EIO; | |
3736 | goto fail; | |
3737 | } | |
3738 | cluster_offset &= s->cluster_offset_mask; | |
cf93980e | 3739 | |
fcccefc5 PB |
3740 | ret = qcow2_pre_write_overlap_check(bs, 0, cluster_offset, out_len); |
3741 | qemu_co_mutex_unlock(&s->lock); | |
3742 | if (ret < 0) { | |
3743 | goto fail; | |
20d97356 BS |
3744 | } |
3745 | ||
fcccefc5 PB |
3746 | iov = (struct iovec) { |
3747 | .iov_base = out_buf, | |
3748 | .iov_len = out_len, | |
3749 | }; | |
3750 | qemu_iovec_init_external(&hd_qiov, &iov, 1); | |
3751 | ||
3752 | BLKDBG_EVENT(bs->file, BLKDBG_WRITE_COMPRESSED); | |
3753 | ret = bdrv_co_pwritev(bs->file, cluster_offset, out_len, &hd_qiov, 0); | |
3754 | if (ret < 0) { | |
3755 | goto fail; | |
3756 | } | |
3757 | success: | |
8f1efd00 KW |
3758 | ret = 0; |
3759 | fail: | |
fcccefc5 | 3760 | qemu_vfree(buf); |
7267c094 | 3761 | g_free(out_buf); |
8f1efd00 | 3762 | return ret; |
20d97356 BS |
3763 | } |
3764 | ||
94054183 HR |
3765 | static int make_completely_empty(BlockDriverState *bs) |
3766 | { | |
ff99129a | 3767 | BDRVQcow2State *s = bs->opaque; |
ed3d2ec9 | 3768 | Error *local_err = NULL; |
94054183 HR |
3769 | int ret, l1_clusters; |
3770 | int64_t offset; | |
3771 | uint64_t *new_reftable = NULL; | |
3772 | uint64_t rt_entry, l1_size2; | |
3773 | struct { | |
3774 | uint64_t l1_offset; | |
3775 | uint64_t reftable_offset; | |
3776 | uint32_t reftable_clusters; | |
3777 | } QEMU_PACKED l1_ofs_rt_ofs_cls; | |
3778 | ||
3779 | ret = qcow2_cache_empty(bs, s->l2_table_cache); | |
3780 | if (ret < 0) { | |
3781 | goto fail; | |
3782 | } | |
3783 | ||
3784 | ret = qcow2_cache_empty(bs, s->refcount_block_cache); | |
3785 | if (ret < 0) { | |
3786 | goto fail; | |
3787 | } | |
3788 | ||
3789 | /* Refcounts will be broken utterly */ | |
3790 | ret = qcow2_mark_dirty(bs); | |
3791 | if (ret < 0) { | |
3792 | goto fail; | |
3793 | } | |
3794 | ||
3795 | BLKDBG_EVENT(bs->file, BLKDBG_L1_UPDATE); | |
3796 | ||
3797 | l1_clusters = DIV_ROUND_UP(s->l1_size, s->cluster_size / sizeof(uint64_t)); | |
3798 | l1_size2 = (uint64_t)s->l1_size * sizeof(uint64_t); | |
3799 | ||
3800 | /* After this call, neither the in-memory nor the on-disk refcount | |
3801 | * information accurately describe the actual references */ | |
3802 | ||
720ff280 | 3803 | ret = bdrv_pwrite_zeroes(bs->file, s->l1_table_offset, |
74021bc4 | 3804 | l1_clusters * s->cluster_size, 0); |
94054183 HR |
3805 | if (ret < 0) { |
3806 | goto fail_broken_refcounts; | |
3807 | } | |
3808 | memset(s->l1_table, 0, l1_size2); | |
3809 | ||
3810 | BLKDBG_EVENT(bs->file, BLKDBG_EMPTY_IMAGE_PREPARE); | |
3811 | ||
3812 | /* Overwrite enough clusters at the beginning of the sectors to place | |
3813 | * the refcount table, a refcount block and the L1 table in; this may | |
3814 | * overwrite parts of the existing refcount and L1 table, which is not | |
3815 | * an issue because the dirty flag is set, complete data loss is in fact | |
3816 | * desired and partial data loss is consequently fine as well */ | |
720ff280 | 3817 | ret = bdrv_pwrite_zeroes(bs->file, s->cluster_size, |
74021bc4 | 3818 | (2 + l1_clusters) * s->cluster_size, 0); |
94054183 HR |
3819 | /* This call (even if it failed overall) may have overwritten on-disk |
3820 | * refcount structures; in that case, the in-memory refcount information | |
3821 | * will probably differ from the on-disk information which makes the BDS | |
3822 | * unusable */ | |
3823 | if (ret < 0) { | |
3824 | goto fail_broken_refcounts; | |
3825 | } | |
3826 | ||
3827 | BLKDBG_EVENT(bs->file, BLKDBG_L1_UPDATE); | |
3828 | BLKDBG_EVENT(bs->file, BLKDBG_REFTABLE_UPDATE); | |
3829 | ||
3830 | /* "Create" an empty reftable (one cluster) directly after the image | |
3831 | * header and an empty L1 table three clusters after the image header; | |
3832 | * the cluster between those two will be used as the first refblock */ | |
f1f7a1dd PM |
3833 | l1_ofs_rt_ofs_cls.l1_offset = cpu_to_be64(3 * s->cluster_size); |
3834 | l1_ofs_rt_ofs_cls.reftable_offset = cpu_to_be64(s->cluster_size); | |
3835 | l1_ofs_rt_ofs_cls.reftable_clusters = cpu_to_be32(1); | |
d9ca2ea2 | 3836 | ret = bdrv_pwrite_sync(bs->file, offsetof(QCowHeader, l1_table_offset), |
94054183 HR |
3837 | &l1_ofs_rt_ofs_cls, sizeof(l1_ofs_rt_ofs_cls)); |
3838 | if (ret < 0) { | |
3839 | goto fail_broken_refcounts; | |
3840 | } | |
3841 | ||
3842 | s->l1_table_offset = 3 * s->cluster_size; | |
3843 | ||
3844 | new_reftable = g_try_new0(uint64_t, s->cluster_size / sizeof(uint64_t)); | |
3845 | if (!new_reftable) { | |
3846 | ret = -ENOMEM; | |
3847 | goto fail_broken_refcounts; | |
3848 | } | |
3849 | ||
3850 | s->refcount_table_offset = s->cluster_size; | |
3851 | s->refcount_table_size = s->cluster_size / sizeof(uint64_t); | |
7061a078 | 3852 | s->max_refcount_table_index = 0; |
94054183 HR |
3853 | |
3854 | g_free(s->refcount_table); | |
3855 | s->refcount_table = new_reftable; | |
3856 | new_reftable = NULL; | |
3857 | ||
3858 | /* Now the in-memory refcount information again corresponds to the on-disk | |
3859 | * information (reftable is empty and no refblocks (the refblock cache is | |
3860 | * empty)); however, this means some clusters (e.g. the image header) are | |
3861 | * referenced, but not refcounted, but the normal qcow2 code assumes that | |
3862 | * the in-memory information is always correct */ | |
3863 | ||
3864 | BLKDBG_EVENT(bs->file, BLKDBG_REFBLOCK_ALLOC); | |
3865 | ||
3866 | /* Enter the first refblock into the reftable */ | |
3867 | rt_entry = cpu_to_be64(2 * s->cluster_size); | |
d9ca2ea2 | 3868 | ret = bdrv_pwrite_sync(bs->file, s->cluster_size, |
94054183 HR |
3869 | &rt_entry, sizeof(rt_entry)); |
3870 | if (ret < 0) { | |
3871 | goto fail_broken_refcounts; | |
3872 | } | |
3873 | s->refcount_table[0] = 2 * s->cluster_size; | |
3874 | ||
3875 | s->free_cluster_index = 0; | |
3876 | assert(3 + l1_clusters <= s->refcount_block_size); | |
3877 | offset = qcow2_alloc_clusters(bs, 3 * s->cluster_size + l1_size2); | |
3878 | if (offset < 0) { | |
3879 | ret = offset; | |
3880 | goto fail_broken_refcounts; | |
3881 | } else if (offset > 0) { | |
3882 | error_report("First cluster in emptied image is in use"); | |
3883 | abort(); | |
3884 | } | |
3885 | ||
3886 | /* Now finally the in-memory information corresponds to the on-disk | |
3887 | * structures and is correct */ | |
3888 | ret = qcow2_mark_clean(bs); | |
3889 | if (ret < 0) { | |
3890 | goto fail; | |
3891 | } | |
3892 | ||
ed3d2ec9 | 3893 | ret = bdrv_truncate(bs->file, (3 + l1_clusters) * s->cluster_size, |
7ea37c30 | 3894 | PREALLOC_MODE_OFF, &local_err); |
94054183 | 3895 | if (ret < 0) { |
ed3d2ec9 | 3896 | error_report_err(local_err); |
94054183 HR |
3897 | goto fail; |
3898 | } | |
3899 | ||
3900 | return 0; | |
3901 | ||
3902 | fail_broken_refcounts: | |
3903 | /* The BDS is unusable at this point. If we wanted to make it usable, we | |
3904 | * would have to call qcow2_refcount_close(), qcow2_refcount_init(), | |
3905 | * qcow2_check_refcounts(), qcow2_refcount_close() and qcow2_refcount_init() | |
3906 | * again. However, because the functions which could have caused this error | |
3907 | * path to be taken are used by those functions as well, it's very likely | |
3908 | * that that sequence will fail as well. Therefore, just eject the BDS. */ | |
3909 | bs->drv = NULL; | |
3910 | ||
3911 | fail: | |
3912 | g_free(new_reftable); | |
3913 | return ret; | |
3914 | } | |
3915 | ||
491d27e2 HR |
3916 | static int qcow2_make_empty(BlockDriverState *bs) |
3917 | { | |
ff99129a | 3918 | BDRVQcow2State *s = bs->opaque; |
d2cb36af EB |
3919 | uint64_t offset, end_offset; |
3920 | int step = QEMU_ALIGN_DOWN(INT_MAX, s->cluster_size); | |
94054183 HR |
3921 | int l1_clusters, ret = 0; |
3922 | ||
3923 | l1_clusters = DIV_ROUND_UP(s->l1_size, s->cluster_size / sizeof(uint64_t)); | |
3924 | ||
4096974e | 3925 | if (s->qcow_version >= 3 && !s->snapshots && !s->nb_bitmaps && |
f0603329 DB |
3926 | 3 + l1_clusters <= s->refcount_block_size && |
3927 | s->crypt_method_header != QCOW_CRYPT_LUKS) { | |
4096974e EB |
3928 | /* The following function only works for qcow2 v3 images (it |
3929 | * requires the dirty flag) and only as long as there are no | |
3930 | * features that reserve extra clusters (such as snapshots, | |
3931 | * LUKS header, or persistent bitmaps), because it completely | |
3932 | * empties the image. Furthermore, the L1 table and three | |
3933 | * additional clusters (image header, refcount table, one | |
3934 | * refcount block) have to fit inside one refcount block. */ | |
94054183 HR |
3935 | return make_completely_empty(bs); |
3936 | } | |
491d27e2 | 3937 | |
94054183 HR |
3938 | /* This fallback code simply discards every active cluster; this is slow, |
3939 | * but works in all cases */ | |
d2cb36af EB |
3940 | end_offset = bs->total_sectors * BDRV_SECTOR_SIZE; |
3941 | for (offset = 0; offset < end_offset; offset += step) { | |
491d27e2 HR |
3942 | /* As this function is generally used after committing an external |
3943 | * snapshot, QCOW2_DISCARD_SNAPSHOT seems appropriate. Also, the | |
3944 | * default action for this kind of discard is to pass the discard, | |
3945 | * which will ideally result in an actually smaller image file, as | |
3946 | * is probably desired. */ | |
d2cb36af EB |
3947 | ret = qcow2_cluster_discard(bs, offset, MIN(step, end_offset - offset), |
3948 | QCOW2_DISCARD_SNAPSHOT, true); | |
491d27e2 HR |
3949 | if (ret < 0) { |
3950 | break; | |
3951 | } | |
3952 | } | |
3953 | ||
3954 | return ret; | |
3955 | } | |
3956 | ||
a968168c | 3957 | static coroutine_fn int qcow2_co_flush_to_os(BlockDriverState *bs) |
20d97356 | 3958 | { |
ff99129a | 3959 | BDRVQcow2State *s = bs->opaque; |
29c1a730 KW |
3960 | int ret; |
3961 | ||
8b94ff85 | 3962 | qemu_co_mutex_lock(&s->lock); |
8b220eb7 | 3963 | ret = qcow2_write_caches(bs); |
8b94ff85 | 3964 | qemu_co_mutex_unlock(&s->lock); |
29c1a730 | 3965 | |
8b220eb7 | 3966 | return ret; |
eb489bb1 KW |
3967 | } |
3968 | ||
c501c352 SH |
3969 | static BlockMeasureInfo *qcow2_measure(QemuOpts *opts, BlockDriverState *in_bs, |
3970 | Error **errp) | |
3971 | { | |
3972 | Error *local_err = NULL; | |
3973 | BlockMeasureInfo *info; | |
3974 | uint64_t required = 0; /* bytes that contribute to required size */ | |
3975 | uint64_t virtual_size; /* disk size as seen by guest */ | |
3976 | uint64_t refcount_bits; | |
3977 | uint64_t l2_tables; | |
3978 | size_t cluster_size; | |
3979 | int version; | |
3980 | char *optstr; | |
3981 | PreallocMode prealloc; | |
3982 | bool has_backing_file; | |
3983 | ||
3984 | /* Parse image creation options */ | |
3985 | cluster_size = qcow2_opt_get_cluster_size_del(opts, &local_err); | |
3986 | if (local_err) { | |
3987 | goto err; | |
3988 | } | |
3989 | ||
3990 | version = qcow2_opt_get_version_del(opts, &local_err); | |
3991 | if (local_err) { | |
3992 | goto err; | |
3993 | } | |
3994 | ||
3995 | refcount_bits = qcow2_opt_get_refcount_bits_del(opts, version, &local_err); | |
3996 | if (local_err) { | |
3997 | goto err; | |
3998 | } | |
3999 | ||
4000 | optstr = qemu_opt_get_del(opts, BLOCK_OPT_PREALLOC); | |
f7abe0ec | 4001 | prealloc = qapi_enum_parse(&PreallocMode_lookup, optstr, |
06c60b6c | 4002 | PREALLOC_MODE_OFF, &local_err); |
c501c352 SH |
4003 | g_free(optstr); |
4004 | if (local_err) { | |
4005 | goto err; | |
4006 | } | |
4007 | ||
4008 | optstr = qemu_opt_get_del(opts, BLOCK_OPT_BACKING_FILE); | |
4009 | has_backing_file = !!optstr; | |
4010 | g_free(optstr); | |
4011 | ||
9e029689 AG |
4012 | virtual_size = qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0); |
4013 | virtual_size = ROUND_UP(virtual_size, cluster_size); | |
c501c352 SH |
4014 | |
4015 | /* Check that virtual disk size is valid */ | |
4016 | l2_tables = DIV_ROUND_UP(virtual_size / cluster_size, | |
4017 | cluster_size / sizeof(uint64_t)); | |
4018 | if (l2_tables * sizeof(uint64_t) > QCOW_MAX_L1_SIZE) { | |
4019 | error_setg(&local_err, "The image size is too large " | |
4020 | "(try using a larger cluster size)"); | |
4021 | goto err; | |
4022 | } | |
4023 | ||
4024 | /* Account for input image */ | |
4025 | if (in_bs) { | |
4026 | int64_t ssize = bdrv_getlength(in_bs); | |
4027 | if (ssize < 0) { | |
4028 | error_setg_errno(&local_err, -ssize, | |
4029 | "Unable to get image virtual_size"); | |
4030 | goto err; | |
4031 | } | |
4032 | ||
9e029689 | 4033 | virtual_size = ROUND_UP(ssize, cluster_size); |
c501c352 SH |
4034 | |
4035 | if (has_backing_file) { | |
4036 | /* We don't how much of the backing chain is shared by the input | |
4037 | * image and the new image file. In the worst case the new image's | |
4038 | * backing file has nothing in common with the input image. Be | |
4039 | * conservative and assume all clusters need to be written. | |
4040 | */ | |
4041 | required = virtual_size; | |
4042 | } else { | |
b85ee453 | 4043 | int64_t offset; |
31826642 | 4044 | int64_t pnum = 0; |
c501c352 | 4045 | |
31826642 EB |
4046 | for (offset = 0; offset < ssize; offset += pnum) { |
4047 | int ret; | |
c501c352 | 4048 | |
31826642 EB |
4049 | ret = bdrv_block_status_above(in_bs, NULL, offset, |
4050 | ssize - offset, &pnum, NULL, | |
4051 | NULL); | |
c501c352 SH |
4052 | if (ret < 0) { |
4053 | error_setg_errno(&local_err, -ret, | |
4054 | "Unable to get block status"); | |
4055 | goto err; | |
4056 | } | |
4057 | ||
4058 | if (ret & BDRV_BLOCK_ZERO) { | |
4059 | /* Skip zero regions (safe with no backing file) */ | |
4060 | } else if ((ret & (BDRV_BLOCK_DATA | BDRV_BLOCK_ALLOCATED)) == | |
4061 | (BDRV_BLOCK_DATA | BDRV_BLOCK_ALLOCATED)) { | |
4062 | /* Extend pnum to end of cluster for next iteration */ | |
31826642 | 4063 | pnum = ROUND_UP(offset + pnum, cluster_size) - offset; |
c501c352 SH |
4064 | |
4065 | /* Count clusters we've seen */ | |
31826642 | 4066 | required += offset % cluster_size + pnum; |
c501c352 SH |
4067 | } |
4068 | } | |
4069 | } | |
4070 | } | |
4071 | ||
4072 | /* Take into account preallocation. Nothing special is needed for | |
4073 | * PREALLOC_MODE_METADATA since metadata is always counted. | |
4074 | */ | |
4075 | if (prealloc == PREALLOC_MODE_FULL || prealloc == PREALLOC_MODE_FALLOC) { | |
4076 | required = virtual_size; | |
4077 | } | |
4078 | ||
4079 | info = g_new(BlockMeasureInfo, 1); | |
4080 | info->fully_allocated = | |
4081 | qcow2_calc_prealloc_size(virtual_size, cluster_size, | |
4082 | ctz32(refcount_bits)); | |
4083 | ||
4084 | /* Remove data clusters that are not required. This overestimates the | |
4085 | * required size because metadata needed for the fully allocated file is | |
4086 | * still counted. | |
4087 | */ | |
4088 | info->required = info->fully_allocated - virtual_size + required; | |
4089 | return info; | |
4090 | ||
4091 | err: | |
4092 | error_propagate(errp, local_err); | |
4093 | return NULL; | |
4094 | } | |
4095 | ||
7c80ab3f | 4096 | static int qcow2_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
20d97356 | 4097 | { |
ff99129a | 4098 | BDRVQcow2State *s = bs->opaque; |
95de6d70 | 4099 | bdi->unallocated_blocks_are_zero = true; |
20d97356 | 4100 | bdi->cluster_size = s->cluster_size; |
7c80ab3f | 4101 | bdi->vm_state_offset = qcow2_vm_state_offset(s); |
20d97356 BS |
4102 | return 0; |
4103 | } | |
4104 | ||
37764dfb HR |
4105 | static ImageInfoSpecific *qcow2_get_specific_info(BlockDriverState *bs) |
4106 | { | |
ff99129a | 4107 | BDRVQcow2State *s = bs->opaque; |
0a12f6f8 DB |
4108 | ImageInfoSpecific *spec_info; |
4109 | QCryptoBlockInfo *encrypt_info = NULL; | |
37764dfb | 4110 | |
0a12f6f8 DB |
4111 | if (s->crypto != NULL) { |
4112 | encrypt_info = qcrypto_block_get_info(s->crypto, &error_abort); | |
4113 | } | |
4114 | ||
4115 | spec_info = g_new(ImageInfoSpecific, 1); | |
37764dfb | 4116 | *spec_info = (ImageInfoSpecific){ |
6a8f9661 | 4117 | .type = IMAGE_INFO_SPECIFIC_KIND_QCOW2, |
32bafa8f | 4118 | .u.qcow2.data = g_new(ImageInfoSpecificQCow2, 1), |
37764dfb HR |
4119 | }; |
4120 | if (s->qcow_version == 2) { | |
32bafa8f | 4121 | *spec_info->u.qcow2.data = (ImageInfoSpecificQCow2){ |
0709c5a1 HR |
4122 | .compat = g_strdup("0.10"), |
4123 | .refcount_bits = s->refcount_bits, | |
37764dfb HR |
4124 | }; |
4125 | } else if (s->qcow_version == 3) { | |
32bafa8f | 4126 | *spec_info->u.qcow2.data = (ImageInfoSpecificQCow2){ |
37764dfb HR |
4127 | .compat = g_strdup("1.1"), |
4128 | .lazy_refcounts = s->compatible_features & | |
4129 | QCOW2_COMPAT_LAZY_REFCOUNTS, | |
4130 | .has_lazy_refcounts = true, | |
9009b196 HR |
4131 | .corrupt = s->incompatible_features & |
4132 | QCOW2_INCOMPAT_CORRUPT, | |
4133 | .has_corrupt = true, | |
0709c5a1 | 4134 | .refcount_bits = s->refcount_bits, |
37764dfb | 4135 | }; |
b1fc8f93 DL |
4136 | } else { |
4137 | /* if this assertion fails, this probably means a new version was | |
4138 | * added without having it covered here */ | |
4139 | assert(false); | |
37764dfb HR |
4140 | } |
4141 | ||
0a12f6f8 DB |
4142 | if (encrypt_info) { |
4143 | ImageInfoSpecificQCow2Encryption *qencrypt = | |
4144 | g_new(ImageInfoSpecificQCow2Encryption, 1); | |
4145 | switch (encrypt_info->format) { | |
4146 | case Q_CRYPTO_BLOCK_FORMAT_QCOW: | |
4147 | qencrypt->format = BLOCKDEV_QCOW2_ENCRYPTION_FORMAT_AES; | |
0a12f6f8 DB |
4148 | break; |
4149 | case Q_CRYPTO_BLOCK_FORMAT_LUKS: | |
4150 | qencrypt->format = BLOCKDEV_QCOW2_ENCRYPTION_FORMAT_LUKS; | |
4151 | qencrypt->u.luks = encrypt_info->u.luks; | |
4152 | break; | |
4153 | default: | |
4154 | abort(); | |
4155 | } | |
4156 | /* Since we did shallow copy above, erase any pointers | |
4157 | * in the original info */ | |
4158 | memset(&encrypt_info->u, 0, sizeof(encrypt_info->u)); | |
4159 | qapi_free_QCryptoBlockInfo(encrypt_info); | |
4160 | ||
4161 | spec_info->u.qcow2.data->has_encrypt = true; | |
4162 | spec_info->u.qcow2.data->encrypt = qencrypt; | |
4163 | } | |
4164 | ||
37764dfb HR |
4165 | return spec_info; |
4166 | } | |
4167 | ||
cf8074b3 KW |
4168 | static int qcow2_save_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, |
4169 | int64_t pos) | |
20d97356 | 4170 | { |
ff99129a | 4171 | BDRVQcow2State *s = bs->opaque; |
20d97356 | 4172 | |
66f82cee | 4173 | BLKDBG_EVENT(bs->file, BLKDBG_VMSTATE_SAVE); |
734a7758 KW |
4174 | return bs->drv->bdrv_co_pwritev(bs, qcow2_vm_state_offset(s) + pos, |
4175 | qiov->size, qiov, 0); | |
20d97356 BS |
4176 | } |
4177 | ||
5ddda0b8 KW |
4178 | static int qcow2_load_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, |
4179 | int64_t pos) | |
20d97356 | 4180 | { |
ff99129a | 4181 | BDRVQcow2State *s = bs->opaque; |
20d97356 | 4182 | |
66f82cee | 4183 | BLKDBG_EVENT(bs->file, BLKDBG_VMSTATE_LOAD); |
734a7758 KW |
4184 | return bs->drv->bdrv_co_preadv(bs, qcow2_vm_state_offset(s) + pos, |
4185 | qiov->size, qiov, 0); | |
20d97356 BS |
4186 | } |
4187 | ||
9296b3ed HR |
4188 | /* |
4189 | * Downgrades an image's version. To achieve this, any incompatible features | |
4190 | * have to be removed. | |
4191 | */ | |
4057a2b2 | 4192 | static int qcow2_downgrade(BlockDriverState *bs, int target_version, |
d1402b50 HR |
4193 | BlockDriverAmendStatusCB *status_cb, void *cb_opaque, |
4194 | Error **errp) | |
9296b3ed | 4195 | { |
ff99129a | 4196 | BDRVQcow2State *s = bs->opaque; |
9296b3ed HR |
4197 | int current_version = s->qcow_version; |
4198 | int ret; | |
4199 | ||
d1402b50 HR |
4200 | /* This is qcow2_downgrade(), not qcow2_upgrade() */ |
4201 | assert(target_version < current_version); | |
4202 | ||
4203 | /* There are no other versions (now) that you can downgrade to */ | |
4204 | assert(target_version == 2); | |
9296b3ed HR |
4205 | |
4206 | if (s->refcount_order != 4) { | |
d1402b50 | 4207 | error_setg(errp, "compat=0.10 requires refcount_bits=16"); |
9296b3ed HR |
4208 | return -ENOTSUP; |
4209 | } | |
4210 | ||
4211 | /* clear incompatible features */ | |
4212 | if (s->incompatible_features & QCOW2_INCOMPAT_DIRTY) { | |
4213 | ret = qcow2_mark_clean(bs); | |
4214 | if (ret < 0) { | |
d1402b50 | 4215 | error_setg_errno(errp, -ret, "Failed to make the image clean"); |
9296b3ed HR |
4216 | return ret; |
4217 | } | |
4218 | } | |
4219 | ||
4220 | /* with QCOW2_INCOMPAT_CORRUPT, it is pretty much impossible to get here in | |
4221 | * the first place; if that happens nonetheless, returning -ENOTSUP is the | |
4222 | * best thing to do anyway */ | |
4223 | ||
4224 | if (s->incompatible_features) { | |
d1402b50 HR |
4225 | error_setg(errp, "Cannot downgrade an image with incompatible features " |
4226 | "%#" PRIx64 " set", s->incompatible_features); | |
9296b3ed HR |
4227 | return -ENOTSUP; |
4228 | } | |
4229 | ||
4230 | /* since we can ignore compatible features, we can set them to 0 as well */ | |
4231 | s->compatible_features = 0; | |
4232 | /* if lazy refcounts have been used, they have already been fixed through | |
4233 | * clearing the dirty flag */ | |
4234 | ||
4235 | /* clearing autoclear features is trivial */ | |
4236 | s->autoclear_features = 0; | |
4237 | ||
8b13976d | 4238 | ret = qcow2_expand_zero_clusters(bs, status_cb, cb_opaque); |
9296b3ed | 4239 | if (ret < 0) { |
d1402b50 | 4240 | error_setg_errno(errp, -ret, "Failed to turn zero into data clusters"); |
9296b3ed HR |
4241 | return ret; |
4242 | } | |
4243 | ||
4244 | s->qcow_version = target_version; | |
4245 | ret = qcow2_update_header(bs); | |
4246 | if (ret < 0) { | |
4247 | s->qcow_version = current_version; | |
d1402b50 | 4248 | error_setg_errno(errp, -ret, "Failed to update the image header"); |
9296b3ed HR |
4249 | return ret; |
4250 | } | |
4251 | return 0; | |
4252 | } | |
4253 | ||
c293a809 HR |
4254 | typedef enum Qcow2AmendOperation { |
4255 | /* This is the value Qcow2AmendHelperCBInfo::last_operation will be | |
4256 | * statically initialized to so that the helper CB can discern the first | |
4257 | * invocation from an operation change */ | |
4258 | QCOW2_NO_OPERATION = 0, | |
4259 | ||
61ce55fc | 4260 | QCOW2_CHANGING_REFCOUNT_ORDER, |
c293a809 HR |
4261 | QCOW2_DOWNGRADING, |
4262 | } Qcow2AmendOperation; | |
4263 | ||
4264 | typedef struct Qcow2AmendHelperCBInfo { | |
4265 | /* The code coordinating the amend operations should only modify | |
4266 | * these four fields; the rest will be managed by the CB */ | |
4267 | BlockDriverAmendStatusCB *original_status_cb; | |
4268 | void *original_cb_opaque; | |
4269 | ||
4270 | Qcow2AmendOperation current_operation; | |
4271 | ||
4272 | /* Total number of operations to perform (only set once) */ | |
4273 | int total_operations; | |
4274 | ||
4275 | /* The following fields are managed by the CB */ | |
4276 | ||
4277 | /* Number of operations completed */ | |
4278 | int operations_completed; | |
4279 | ||
4280 | /* Cumulative offset of all completed operations */ | |
4281 | int64_t offset_completed; | |
4282 | ||
4283 | Qcow2AmendOperation last_operation; | |
4284 | int64_t last_work_size; | |
4285 | } Qcow2AmendHelperCBInfo; | |
4286 | ||
4287 | static void qcow2_amend_helper_cb(BlockDriverState *bs, | |
4288 | int64_t operation_offset, | |
4289 | int64_t operation_work_size, void *opaque) | |
4290 | { | |
4291 | Qcow2AmendHelperCBInfo *info = opaque; | |
4292 | int64_t current_work_size; | |
4293 | int64_t projected_work_size; | |
4294 | ||
4295 | if (info->current_operation != info->last_operation) { | |
4296 | if (info->last_operation != QCOW2_NO_OPERATION) { | |
4297 | info->offset_completed += info->last_work_size; | |
4298 | info->operations_completed++; | |
4299 | } | |
4300 | ||
4301 | info->last_operation = info->current_operation; | |
4302 | } | |
4303 | ||
4304 | assert(info->total_operations > 0); | |
4305 | assert(info->operations_completed < info->total_operations); | |
4306 | ||
4307 | info->last_work_size = operation_work_size; | |
4308 | ||
4309 | current_work_size = info->offset_completed + operation_work_size; | |
4310 | ||
4311 | /* current_work_size is the total work size for (operations_completed + 1) | |
4312 | * operations (which includes this one), so multiply it by the number of | |
4313 | * operations not covered and divide it by the number of operations | |
4314 | * covered to get a projection for the operations not covered */ | |
4315 | projected_work_size = current_work_size * (info->total_operations - | |
4316 | info->operations_completed - 1) | |
4317 | / (info->operations_completed + 1); | |
4318 | ||
4319 | info->original_status_cb(bs, info->offset_completed + operation_offset, | |
4320 | current_work_size + projected_work_size, | |
4321 | info->original_cb_opaque); | |
4322 | } | |
4323 | ||
77485434 | 4324 | static int qcow2_amend_options(BlockDriverState *bs, QemuOpts *opts, |
8b13976d | 4325 | BlockDriverAmendStatusCB *status_cb, |
d1402b50 HR |
4326 | void *cb_opaque, |
4327 | Error **errp) | |
9296b3ed | 4328 | { |
ff99129a | 4329 | BDRVQcow2State *s = bs->opaque; |
9296b3ed HR |
4330 | int old_version = s->qcow_version, new_version = old_version; |
4331 | uint64_t new_size = 0; | |
4332 | const char *backing_file = NULL, *backing_format = NULL; | |
4333 | bool lazy_refcounts = s->use_lazy_refcounts; | |
1bd0e2d1 CL |
4334 | const char *compat = NULL; |
4335 | uint64_t cluster_size = s->cluster_size; | |
4336 | bool encrypt; | |
4652b8f3 | 4337 | int encformat; |
61ce55fc | 4338 | int refcount_bits = s->refcount_bits; |
9296b3ed | 4339 | int ret; |
1bd0e2d1 | 4340 | QemuOptDesc *desc = opts->list->desc; |
c293a809 | 4341 | Qcow2AmendHelperCBInfo helper_cb_info; |
9296b3ed | 4342 | |
1bd0e2d1 CL |
4343 | while (desc && desc->name) { |
4344 | if (!qemu_opt_find(opts, desc->name)) { | |
9296b3ed | 4345 | /* only change explicitly defined options */ |
1bd0e2d1 | 4346 | desc++; |
9296b3ed HR |
4347 | continue; |
4348 | } | |
4349 | ||
8a17b83c HR |
4350 | if (!strcmp(desc->name, BLOCK_OPT_COMPAT_LEVEL)) { |
4351 | compat = qemu_opt_get(opts, BLOCK_OPT_COMPAT_LEVEL); | |
1bd0e2d1 | 4352 | if (!compat) { |
9296b3ed | 4353 | /* preserve default */ |
1bd0e2d1 | 4354 | } else if (!strcmp(compat, "0.10")) { |
9296b3ed | 4355 | new_version = 2; |
1bd0e2d1 | 4356 | } else if (!strcmp(compat, "1.1")) { |
9296b3ed HR |
4357 | new_version = 3; |
4358 | } else { | |
d1402b50 | 4359 | error_setg(errp, "Unknown compatibility level %s", compat); |
9296b3ed HR |
4360 | return -EINVAL; |
4361 | } | |
8a17b83c | 4362 | } else if (!strcmp(desc->name, BLOCK_OPT_PREALLOC)) { |
d1402b50 | 4363 | error_setg(errp, "Cannot change preallocation mode"); |
9296b3ed | 4364 | return -ENOTSUP; |
8a17b83c HR |
4365 | } else if (!strcmp(desc->name, BLOCK_OPT_SIZE)) { |
4366 | new_size = qemu_opt_get_size(opts, BLOCK_OPT_SIZE, 0); | |
4367 | } else if (!strcmp(desc->name, BLOCK_OPT_BACKING_FILE)) { | |
4368 | backing_file = qemu_opt_get(opts, BLOCK_OPT_BACKING_FILE); | |
4369 | } else if (!strcmp(desc->name, BLOCK_OPT_BACKING_FMT)) { | |
4370 | backing_format = qemu_opt_get(opts, BLOCK_OPT_BACKING_FMT); | |
4371 | } else if (!strcmp(desc->name, BLOCK_OPT_ENCRYPT)) { | |
4372 | encrypt = qemu_opt_get_bool(opts, BLOCK_OPT_ENCRYPT, | |
b25b387f | 4373 | !!s->crypto); |
f6fa64f6 | 4374 | |
b25b387f | 4375 | if (encrypt != !!s->crypto) { |
d1402b50 HR |
4376 | error_setg(errp, |
4377 | "Changing the encryption flag is not supported"); | |
9296b3ed HR |
4378 | return -ENOTSUP; |
4379 | } | |
4652b8f3 DB |
4380 | } else if (!strcmp(desc->name, BLOCK_OPT_ENCRYPT_FORMAT)) { |
4381 | encformat = qcow2_crypt_method_from_format( | |
4382 | qemu_opt_get(opts, BLOCK_OPT_ENCRYPT_FORMAT)); | |
4383 | ||
4384 | if (encformat != s->crypt_method_header) { | |
d1402b50 HR |
4385 | error_setg(errp, |
4386 | "Changing the encryption format is not supported"); | |
4652b8f3 DB |
4387 | return -ENOTSUP; |
4388 | } | |
f66afbe2 | 4389 | } else if (g_str_has_prefix(desc->name, "encrypt.")) { |
d1402b50 HR |
4390 | error_setg(errp, |
4391 | "Changing the encryption parameters is not supported"); | |
f66afbe2 | 4392 | return -ENOTSUP; |
8a17b83c HR |
4393 | } else if (!strcmp(desc->name, BLOCK_OPT_CLUSTER_SIZE)) { |
4394 | cluster_size = qemu_opt_get_size(opts, BLOCK_OPT_CLUSTER_SIZE, | |
1bd0e2d1 CL |
4395 | cluster_size); |
4396 | if (cluster_size != s->cluster_size) { | |
d1402b50 | 4397 | error_setg(errp, "Changing the cluster size is not supported"); |
9296b3ed HR |
4398 | return -ENOTSUP; |
4399 | } | |
8a17b83c HR |
4400 | } else if (!strcmp(desc->name, BLOCK_OPT_LAZY_REFCOUNTS)) { |
4401 | lazy_refcounts = qemu_opt_get_bool(opts, BLOCK_OPT_LAZY_REFCOUNTS, | |
1bd0e2d1 | 4402 | lazy_refcounts); |
06d05fa7 | 4403 | } else if (!strcmp(desc->name, BLOCK_OPT_REFCOUNT_BITS)) { |
61ce55fc HR |
4404 | refcount_bits = qemu_opt_get_number(opts, BLOCK_OPT_REFCOUNT_BITS, |
4405 | refcount_bits); | |
4406 | ||
4407 | if (refcount_bits <= 0 || refcount_bits > 64 || | |
4408 | !is_power_of_2(refcount_bits)) | |
4409 | { | |
d1402b50 HR |
4410 | error_setg(errp, "Refcount width must be a power of two and " |
4411 | "may not exceed 64 bits"); | |
61ce55fc HR |
4412 | return -EINVAL; |
4413 | } | |
9296b3ed | 4414 | } else { |
164e0f89 | 4415 | /* if this point is reached, this probably means a new option was |
9296b3ed | 4416 | * added without having it covered here */ |
164e0f89 | 4417 | abort(); |
9296b3ed | 4418 | } |
1bd0e2d1 CL |
4419 | |
4420 | desc++; | |
9296b3ed HR |
4421 | } |
4422 | ||
c293a809 HR |
4423 | helper_cb_info = (Qcow2AmendHelperCBInfo){ |
4424 | .original_status_cb = status_cb, | |
4425 | .original_cb_opaque = cb_opaque, | |
4426 | .total_operations = (new_version < old_version) | |
61ce55fc | 4427 | + (s->refcount_bits != refcount_bits) |
c293a809 HR |
4428 | }; |
4429 | ||
1038bbb8 HR |
4430 | /* Upgrade first (some features may require compat=1.1) */ |
4431 | if (new_version > old_version) { | |
4432 | s->qcow_version = new_version; | |
4433 | ret = qcow2_update_header(bs); | |
4434 | if (ret < 0) { | |
4435 | s->qcow_version = old_version; | |
d1402b50 | 4436 | error_setg_errno(errp, -ret, "Failed to update the image header"); |
1038bbb8 | 4437 | return ret; |
9296b3ed HR |
4438 | } |
4439 | } | |
4440 | ||
61ce55fc HR |
4441 | if (s->refcount_bits != refcount_bits) { |
4442 | int refcount_order = ctz32(refcount_bits); | |
61ce55fc HR |
4443 | |
4444 | if (new_version < 3 && refcount_bits != 16) { | |
d1402b50 HR |
4445 | error_setg(errp, "Refcount widths other than 16 bits require " |
4446 | "compatibility level 1.1 or above (use compat=1.1 or " | |
4447 | "greater)"); | |
61ce55fc HR |
4448 | return -EINVAL; |
4449 | } | |
4450 | ||
4451 | helper_cb_info.current_operation = QCOW2_CHANGING_REFCOUNT_ORDER; | |
4452 | ret = qcow2_change_refcount_order(bs, refcount_order, | |
4453 | &qcow2_amend_helper_cb, | |
d1402b50 | 4454 | &helper_cb_info, errp); |
61ce55fc | 4455 | if (ret < 0) { |
61ce55fc HR |
4456 | return ret; |
4457 | } | |
4458 | } | |
4459 | ||
9296b3ed | 4460 | if (backing_file || backing_format) { |
e4603fe1 KW |
4461 | ret = qcow2_change_backing_file(bs, |
4462 | backing_file ?: s->image_backing_file, | |
4463 | backing_format ?: s->image_backing_format); | |
9296b3ed | 4464 | if (ret < 0) { |
d1402b50 | 4465 | error_setg_errno(errp, -ret, "Failed to change the backing file"); |
9296b3ed HR |
4466 | return ret; |
4467 | } | |
4468 | } | |
4469 | ||
4470 | if (s->use_lazy_refcounts != lazy_refcounts) { | |
4471 | if (lazy_refcounts) { | |
1038bbb8 | 4472 | if (new_version < 3) { |
d1402b50 HR |
4473 | error_setg(errp, "Lazy refcounts only supported with " |
4474 | "compatibility level 1.1 and above (use compat=1.1 " | |
4475 | "or greater)"); | |
9296b3ed HR |
4476 | return -EINVAL; |
4477 | } | |
4478 | s->compatible_features |= QCOW2_COMPAT_LAZY_REFCOUNTS; | |
4479 | ret = qcow2_update_header(bs); | |
4480 | if (ret < 0) { | |
4481 | s->compatible_features &= ~QCOW2_COMPAT_LAZY_REFCOUNTS; | |
d1402b50 | 4482 | error_setg_errno(errp, -ret, "Failed to update the image header"); |
9296b3ed HR |
4483 | return ret; |
4484 | } | |
4485 | s->use_lazy_refcounts = true; | |
4486 | } else { | |
4487 | /* make image clean first */ | |
4488 | ret = qcow2_mark_clean(bs); | |
4489 | if (ret < 0) { | |
d1402b50 | 4490 | error_setg_errno(errp, -ret, "Failed to make the image clean"); |
9296b3ed HR |
4491 | return ret; |
4492 | } | |
4493 | /* now disallow lazy refcounts */ | |
4494 | s->compatible_features &= ~QCOW2_COMPAT_LAZY_REFCOUNTS; | |
4495 | ret = qcow2_update_header(bs); | |
4496 | if (ret < 0) { | |
4497 | s->compatible_features |= QCOW2_COMPAT_LAZY_REFCOUNTS; | |
d1402b50 | 4498 | error_setg_errno(errp, -ret, "Failed to update the image header"); |
9296b3ed HR |
4499 | return ret; |
4500 | } | |
4501 | s->use_lazy_refcounts = false; | |
4502 | } | |
4503 | } | |
4504 | ||
4505 | if (new_size) { | |
6d0eb64d | 4506 | BlockBackend *blk = blk_new(BLK_PERM_RESIZE, BLK_PERM_ALL); |
d1402b50 | 4507 | ret = blk_insert_bs(blk, bs, errp); |
d7086422 | 4508 | if (ret < 0) { |
d7086422 KW |
4509 | blk_unref(blk); |
4510 | return ret; | |
4511 | } | |
4512 | ||
d1402b50 | 4513 | ret = blk_truncate(blk, new_size, PREALLOC_MODE_OFF, errp); |
70b27f36 | 4514 | blk_unref(blk); |
9296b3ed HR |
4515 | if (ret < 0) { |
4516 | return ret; | |
4517 | } | |
4518 | } | |
4519 | ||
1038bbb8 HR |
4520 | /* Downgrade last (so unsupported features can be removed before) */ |
4521 | if (new_version < old_version) { | |
c293a809 HR |
4522 | helper_cb_info.current_operation = QCOW2_DOWNGRADING; |
4523 | ret = qcow2_downgrade(bs, new_version, &qcow2_amend_helper_cb, | |
d1402b50 | 4524 | &helper_cb_info, errp); |
1038bbb8 HR |
4525 | if (ret < 0) { |
4526 | return ret; | |
4527 | } | |
4528 | } | |
4529 | ||
9296b3ed HR |
4530 | return 0; |
4531 | } | |
4532 | ||
85186ebd HR |
4533 | /* |
4534 | * If offset or size are negative, respectively, they will not be included in | |
4535 | * the BLOCK_IMAGE_CORRUPTED event emitted. | |
4536 | * fatal will be ignored for read-only BDS; corruptions found there will always | |
4537 | * be considered non-fatal. | |
4538 | */ | |
4539 | void qcow2_signal_corruption(BlockDriverState *bs, bool fatal, int64_t offset, | |
4540 | int64_t size, const char *message_format, ...) | |
4541 | { | |
ff99129a | 4542 | BDRVQcow2State *s = bs->opaque; |
dc881b44 | 4543 | const char *node_name; |
85186ebd HR |
4544 | char *message; |
4545 | va_list ap; | |
4546 | ||
ddf3b47e | 4547 | fatal = fatal && bdrv_is_writable(bs); |
85186ebd HR |
4548 | |
4549 | if (s->signaled_corruption && | |
4550 | (!fatal || (s->incompatible_features & QCOW2_INCOMPAT_CORRUPT))) | |
4551 | { | |
4552 | return; | |
4553 | } | |
4554 | ||
4555 | va_start(ap, message_format); | |
4556 | message = g_strdup_vprintf(message_format, ap); | |
4557 | va_end(ap); | |
4558 | ||
4559 | if (fatal) { | |
4560 | fprintf(stderr, "qcow2: Marking image as corrupt: %s; further " | |
4561 | "corruption events will be suppressed\n", message); | |
4562 | } else { | |
4563 | fprintf(stderr, "qcow2: Image is corrupt: %s; further non-fatal " | |
4564 | "corruption events will be suppressed\n", message); | |
4565 | } | |
4566 | ||
dc881b44 AG |
4567 | node_name = bdrv_get_node_name(bs); |
4568 | qapi_event_send_block_image_corrupted(bdrv_get_device_name(bs), | |
4569 | *node_name != '\0', node_name, | |
4570 | message, offset >= 0, offset, | |
4571 | size >= 0, size, | |
85186ebd HR |
4572 | fatal, &error_abort); |
4573 | g_free(message); | |
4574 | ||
4575 | if (fatal) { | |
4576 | qcow2_mark_corrupt(bs); | |
4577 | bs->drv = NULL; /* make BDS unusable */ | |
4578 | } | |
4579 | ||
4580 | s->signaled_corruption = true; | |
4581 | } | |
4582 | ||
1bd0e2d1 CL |
4583 | static QemuOptsList qcow2_create_opts = { |
4584 | .name = "qcow2-create-opts", | |
4585 | .head = QTAILQ_HEAD_INITIALIZER(qcow2_create_opts.head), | |
4586 | .desc = { | |
4587 | { | |
4588 | .name = BLOCK_OPT_SIZE, | |
4589 | .type = QEMU_OPT_SIZE, | |
4590 | .help = "Virtual disk size" | |
4591 | }, | |
4592 | { | |
4593 | .name = BLOCK_OPT_COMPAT_LEVEL, | |
4594 | .type = QEMU_OPT_STRING, | |
4595 | .help = "Compatibility level (0.10 or 1.1)" | |
4596 | }, | |
4597 | { | |
4598 | .name = BLOCK_OPT_BACKING_FILE, | |
4599 | .type = QEMU_OPT_STRING, | |
4600 | .help = "File name of a base image" | |
4601 | }, | |
4602 | { | |
4603 | .name = BLOCK_OPT_BACKING_FMT, | |
4604 | .type = QEMU_OPT_STRING, | |
4605 | .help = "Image format of the base image" | |
4606 | }, | |
4607 | { | |
4608 | .name = BLOCK_OPT_ENCRYPT, | |
4609 | .type = QEMU_OPT_BOOL, | |
0cb8d47b DB |
4610 | .help = "Encrypt the image with format 'aes'. (Deprecated " |
4611 | "in favor of " BLOCK_OPT_ENCRYPT_FORMAT "=aes)", | |
4612 | }, | |
4613 | { | |
4614 | .name = BLOCK_OPT_ENCRYPT_FORMAT, | |
4615 | .type = QEMU_OPT_STRING, | |
4652b8f3 | 4616 | .help = "Encrypt the image, format choices: 'aes', 'luks'", |
1bd0e2d1 | 4617 | }, |
4652b8f3 DB |
4618 | BLOCK_CRYPTO_OPT_DEF_KEY_SECRET("encrypt.", |
4619 | "ID of secret providing qcow AES key or LUKS passphrase"), | |
4620 | BLOCK_CRYPTO_OPT_DEF_LUKS_CIPHER_ALG("encrypt."), | |
4621 | BLOCK_CRYPTO_OPT_DEF_LUKS_CIPHER_MODE("encrypt."), | |
4622 | BLOCK_CRYPTO_OPT_DEF_LUKS_IVGEN_ALG("encrypt."), | |
4623 | BLOCK_CRYPTO_OPT_DEF_LUKS_IVGEN_HASH_ALG("encrypt."), | |
4624 | BLOCK_CRYPTO_OPT_DEF_LUKS_HASH_ALG("encrypt."), | |
4625 | BLOCK_CRYPTO_OPT_DEF_LUKS_ITER_TIME("encrypt."), | |
1bd0e2d1 CL |
4626 | { |
4627 | .name = BLOCK_OPT_CLUSTER_SIZE, | |
4628 | .type = QEMU_OPT_SIZE, | |
4629 | .help = "qcow2 cluster size", | |
4630 | .def_value_str = stringify(DEFAULT_CLUSTER_SIZE) | |
4631 | }, | |
4632 | { | |
4633 | .name = BLOCK_OPT_PREALLOC, | |
4634 | .type = QEMU_OPT_STRING, | |
0e4271b7 HT |
4635 | .help = "Preallocation mode (allowed values: off, metadata, " |
4636 | "falloc, full)" | |
1bd0e2d1 CL |
4637 | }, |
4638 | { | |
4639 | .name = BLOCK_OPT_LAZY_REFCOUNTS, | |
4640 | .type = QEMU_OPT_BOOL, | |
4641 | .help = "Postpone refcount updates", | |
4642 | .def_value_str = "off" | |
4643 | }, | |
06d05fa7 HR |
4644 | { |
4645 | .name = BLOCK_OPT_REFCOUNT_BITS, | |
4646 | .type = QEMU_OPT_NUMBER, | |
4647 | .help = "Width of a reference count entry in bits", | |
4648 | .def_value_str = "16" | |
4649 | }, | |
1bd0e2d1 CL |
4650 | { /* end of list */ } |
4651 | } | |
20d97356 BS |
4652 | }; |
4653 | ||
5f535a94 | 4654 | BlockDriver bdrv_qcow2 = { |
7c80ab3f | 4655 | .format_name = "qcow2", |
ff99129a | 4656 | .instance_size = sizeof(BDRVQcow2State), |
7c80ab3f JS |
4657 | .bdrv_probe = qcow2_probe, |
4658 | .bdrv_open = qcow2_open, | |
4659 | .bdrv_close = qcow2_close, | |
21d82ac9 | 4660 | .bdrv_reopen_prepare = qcow2_reopen_prepare, |
5b0959a7 KW |
4661 | .bdrv_reopen_commit = qcow2_reopen_commit, |
4662 | .bdrv_reopen_abort = qcow2_reopen_abort, | |
5365f44d | 4663 | .bdrv_join_options = qcow2_join_options, |
862f215f | 4664 | .bdrv_child_perm = bdrv_format_default_perms, |
efc75e2a | 4665 | .bdrv_co_create_opts = qcow2_co_create_opts, |
b0292b85 | 4666 | .bdrv_co_create = qcow2_co_create, |
3ac21627 | 4667 | .bdrv_has_zero_init = bdrv_has_zero_init_1, |
a320fb04 | 4668 | .bdrv_co_block_status = qcow2_co_block_status, |
7c80ab3f | 4669 | |
ecfe1863 | 4670 | .bdrv_co_preadv = qcow2_co_preadv, |
d46a0bb2 | 4671 | .bdrv_co_pwritev = qcow2_co_pwritev, |
eb489bb1 | 4672 | .bdrv_co_flush_to_os = qcow2_co_flush_to_os, |
419b19d9 | 4673 | |
5544b59f | 4674 | .bdrv_co_pwrite_zeroes = qcow2_co_pwrite_zeroes, |
82e8a788 | 4675 | .bdrv_co_pdiscard = qcow2_co_pdiscard, |
fd9fcd37 FZ |
4676 | .bdrv_co_copy_range_from = qcow2_co_copy_range_from, |
4677 | .bdrv_co_copy_range_to = qcow2_co_copy_range_to, | |
061ca8a3 | 4678 | .bdrv_co_truncate = qcow2_co_truncate, |
fcccefc5 | 4679 | .bdrv_co_pwritev_compressed = qcow2_co_pwritev_compressed, |
491d27e2 | 4680 | .bdrv_make_empty = qcow2_make_empty, |
20d97356 BS |
4681 | |
4682 | .bdrv_snapshot_create = qcow2_snapshot_create, | |
4683 | .bdrv_snapshot_goto = qcow2_snapshot_goto, | |
4684 | .bdrv_snapshot_delete = qcow2_snapshot_delete, | |
4685 | .bdrv_snapshot_list = qcow2_snapshot_list, | |
1bd0e2d1 | 4686 | .bdrv_snapshot_load_tmp = qcow2_snapshot_load_tmp, |
c501c352 | 4687 | .bdrv_measure = qcow2_measure, |
1bd0e2d1 | 4688 | .bdrv_get_info = qcow2_get_info, |
37764dfb | 4689 | .bdrv_get_specific_info = qcow2_get_specific_info, |
20d97356 | 4690 | |
7c80ab3f JS |
4691 | .bdrv_save_vmstate = qcow2_save_vmstate, |
4692 | .bdrv_load_vmstate = qcow2_load_vmstate, | |
20d97356 | 4693 | |
8ee79e70 | 4694 | .supports_backing = true, |
20d97356 BS |
4695 | .bdrv_change_backing_file = qcow2_change_backing_file, |
4696 | ||
d34682cd | 4697 | .bdrv_refresh_limits = qcow2_refresh_limits, |
2b148f39 | 4698 | .bdrv_co_invalidate_cache = qcow2_co_invalidate_cache, |
ec6d8912 | 4699 | .bdrv_inactivate = qcow2_inactivate, |
06d9260f | 4700 | |
1bd0e2d1 | 4701 | .create_opts = &qcow2_create_opts, |
2fd61638 | 4702 | .bdrv_co_check = qcow2_co_check, |
c282e1fd | 4703 | .bdrv_amend_options = qcow2_amend_options, |
279621c0 AG |
4704 | |
4705 | .bdrv_detach_aio_context = qcow2_detach_aio_context, | |
4706 | .bdrv_attach_aio_context = qcow2_attach_aio_context, | |
1b6b0562 VSO |
4707 | |
4708 | .bdrv_reopen_bitmaps_rw = qcow2_reopen_bitmaps_rw, | |
da0eb242 | 4709 | .bdrv_can_store_new_dirty_bitmap = qcow2_can_store_new_dirty_bitmap, |
469c71ed | 4710 | .bdrv_remove_persistent_dirty_bitmap = qcow2_remove_persistent_dirty_bitmap, |
20d97356 BS |
4711 | }; |
4712 | ||
5efa9d5a AL |
4713 | static void bdrv_qcow2_init(void) |
4714 | { | |
4715 | bdrv_register(&bdrv_qcow2); | |
4716 | } | |
4717 | ||
4718 | block_init(bdrv_qcow2_init); |