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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" |
2714f13d VSO |
26 | |
27 | #define ZLIB_CONST | |
28 | #include <zlib.h> | |
29 | ||
737e150e | 30 | #include "block/block_int.h" |
609f45ea | 31 | #include "block/qdict.h" |
23588797 | 32 | #include "sysemu/block-backend.h" |
1de7afc9 | 33 | #include "qemu/module.h" |
0d8c41da | 34 | #include "qcow2.h" |
1de7afc9 | 35 | #include "qemu/error-report.h" |
e688df6b | 36 | #include "qapi/error.h" |
9af23989 | 37 | #include "qapi/qapi-events-block-core.h" |
6b673957 MA |
38 | #include "qapi/qmp/qdict.h" |
39 | #include "qapi/qmp/qstring.h" | |
3cce16f4 | 40 | #include "trace.h" |
1bd0e2d1 | 41 | #include "qemu/option_int.h" |
f348b6d1 | 42 | #include "qemu/cutils.h" |
58369e22 | 43 | #include "qemu/bswap.h" |
b76b4f60 KW |
44 | #include "qapi/qobject-input-visitor.h" |
45 | #include "qapi/qapi-visit-block-core.h" | |
0d8c41da | 46 | #include "crypto.h" |
ceb029cd | 47 | #include "block/thread-pool.h" |
585f8587 FB |
48 | |
49 | /* | |
50 | Differences with QCOW: | |
51 | ||
52 | - Support for multiple incremental snapshots. | |
53 | - Memory management by reference counts. | |
54 | - Clusters which have a reference count of one have the bit | |
55 | QCOW_OFLAG_COPIED to optimize write performance. | |
5fafdf24 | 56 | - Size of compressed clusters is stored in sectors to reduce bit usage |
585f8587 FB |
57 | in the cluster offsets. |
58 | - Support for storing additional data (such as the VM state) in the | |
3b46e624 | 59 | snapshots. |
585f8587 FB |
60 | - If a backing store is used, the cluster size is not constrained |
61 | (could be backported to QCOW). | |
62 | - L2 tables have always a size of one cluster. | |
63 | */ | |
64 | ||
9b80ddf3 AL |
65 | |
66 | typedef struct { | |
67 | uint32_t magic; | |
68 | uint32_t len; | |
c4217f64 | 69 | } QEMU_PACKED QCowExtension; |
21d82ac9 | 70 | |
7c80ab3f JS |
71 | #define QCOW2_EXT_MAGIC_END 0 |
72 | #define QCOW2_EXT_MAGIC_BACKING_FORMAT 0xE2792ACA | |
cfcc4c62 | 73 | #define QCOW2_EXT_MAGIC_FEATURE_TABLE 0x6803f857 |
4652b8f3 | 74 | #define QCOW2_EXT_MAGIC_CRYPTO_HEADER 0x0537be77 |
88ddffae | 75 | #define QCOW2_EXT_MAGIC_BITMAPS 0x23852875 |
93c24936 | 76 | #define QCOW2_EXT_MAGIC_DATA_FILE 0x44415441 |
9b80ddf3 | 77 | |
c3c10f72 VSO |
78 | static int coroutine_fn |
79 | qcow2_co_preadv_compressed(BlockDriverState *bs, | |
80 | uint64_t file_cluster_offset, | |
81 | uint64_t offset, | |
82 | uint64_t bytes, | |
83 | QEMUIOVector *qiov); | |
84 | ||
7c80ab3f | 85 | static int qcow2_probe(const uint8_t *buf, int buf_size, const char *filename) |
585f8587 FB |
86 | { |
87 | const QCowHeader *cow_header = (const void *)buf; | |
3b46e624 | 88 | |
585f8587 FB |
89 | if (buf_size >= sizeof(QCowHeader) && |
90 | be32_to_cpu(cow_header->magic) == QCOW_MAGIC && | |
6744cbab | 91 | be32_to_cpu(cow_header->version) >= 2) |
585f8587 FB |
92 | return 100; |
93 | else | |
94 | return 0; | |
95 | } | |
96 | ||
9b80ddf3 | 97 | |
4652b8f3 DB |
98 | static ssize_t qcow2_crypto_hdr_read_func(QCryptoBlock *block, size_t offset, |
99 | uint8_t *buf, size_t buflen, | |
100 | void *opaque, Error **errp) | |
101 | { | |
102 | BlockDriverState *bs = opaque; | |
103 | BDRVQcow2State *s = bs->opaque; | |
104 | ssize_t ret; | |
105 | ||
106 | if ((offset + buflen) > s->crypto_header.length) { | |
107 | error_setg(errp, "Request for data outside of extension header"); | |
108 | return -1; | |
109 | } | |
110 | ||
111 | ret = bdrv_pread(bs->file, | |
112 | s->crypto_header.offset + offset, buf, buflen); | |
113 | if (ret < 0) { | |
114 | error_setg_errno(errp, -ret, "Could not read encryption header"); | |
115 | return -1; | |
116 | } | |
117 | return ret; | |
118 | } | |
119 | ||
120 | ||
121 | static ssize_t qcow2_crypto_hdr_init_func(QCryptoBlock *block, size_t headerlen, | |
122 | void *opaque, Error **errp) | |
123 | { | |
124 | BlockDriverState *bs = opaque; | |
125 | BDRVQcow2State *s = bs->opaque; | |
126 | int64_t ret; | |
127 | int64_t clusterlen; | |
128 | ||
129 | ret = qcow2_alloc_clusters(bs, headerlen); | |
130 | if (ret < 0) { | |
131 | error_setg_errno(errp, -ret, | |
132 | "Cannot allocate cluster for LUKS header size %zu", | |
133 | headerlen); | |
134 | return -1; | |
135 | } | |
136 | ||
137 | s->crypto_header.length = headerlen; | |
138 | s->crypto_header.offset = ret; | |
139 | ||
140 | /* Zero fill remaining space in cluster so it has predictable | |
141 | * content in case of future spec changes */ | |
142 | clusterlen = size_to_clusters(s, headerlen) * s->cluster_size; | |
966b000f | 143 | assert(qcow2_pre_write_overlap_check(bs, 0, ret, clusterlen, false) == 0); |
4652b8f3 DB |
144 | ret = bdrv_pwrite_zeroes(bs->file, |
145 | ret + headerlen, | |
146 | clusterlen - headerlen, 0); | |
147 | if (ret < 0) { | |
148 | error_setg_errno(errp, -ret, "Could not zero fill encryption header"); | |
149 | return -1; | |
150 | } | |
151 | ||
152 | return ret; | |
153 | } | |
154 | ||
155 | ||
156 | static ssize_t qcow2_crypto_hdr_write_func(QCryptoBlock *block, size_t offset, | |
157 | const uint8_t *buf, size_t buflen, | |
158 | void *opaque, Error **errp) | |
159 | { | |
160 | BlockDriverState *bs = opaque; | |
161 | BDRVQcow2State *s = bs->opaque; | |
162 | ssize_t ret; | |
163 | ||
164 | if ((offset + buflen) > s->crypto_header.length) { | |
165 | error_setg(errp, "Request for data outside of extension header"); | |
166 | return -1; | |
167 | } | |
168 | ||
169 | ret = bdrv_pwrite(bs->file, | |
170 | s->crypto_header.offset + offset, buf, buflen); | |
171 | if (ret < 0) { | |
172 | error_setg_errno(errp, -ret, "Could not read encryption header"); | |
173 | return -1; | |
174 | } | |
175 | return ret; | |
176 | } | |
177 | ||
178 | ||
9b80ddf3 AL |
179 | /* |
180 | * read qcow2 extension and fill bs | |
181 | * start reading from start_offset | |
182 | * finish reading upon magic of value 0 or when end_offset reached | |
183 | * unknown magic is skipped (future extension this version knows nothing about) | |
184 | * return 0 upon success, non-0 otherwise | |
185 | */ | |
7c80ab3f | 186 | static int qcow2_read_extensions(BlockDriverState *bs, uint64_t start_offset, |
3ef6c40a | 187 | uint64_t end_offset, void **p_feature_table, |
88ddffae VSO |
188 | int flags, bool *need_update_header, |
189 | Error **errp) | |
9b80ddf3 | 190 | { |
ff99129a | 191 | BDRVQcow2State *s = bs->opaque; |
9b80ddf3 AL |
192 | QCowExtension ext; |
193 | uint64_t offset; | |
75bab85c | 194 | int ret; |
88ddffae VSO |
195 | Qcow2BitmapHeaderExt bitmaps_ext; |
196 | ||
197 | if (need_update_header != NULL) { | |
198 | *need_update_header = false; | |
199 | } | |
9b80ddf3 AL |
200 | |
201 | #ifdef DEBUG_EXT | |
7c80ab3f | 202 | printf("qcow2_read_extensions: start=%ld end=%ld\n", start_offset, end_offset); |
9b80ddf3 AL |
203 | #endif |
204 | offset = start_offset; | |
205 | while (offset < end_offset) { | |
206 | ||
207 | #ifdef DEBUG_EXT | |
208 | /* Sanity check */ | |
209 | if (offset > s->cluster_size) | |
7c80ab3f | 210 | printf("qcow2_read_extension: suspicious offset %lu\n", offset); |
9b80ddf3 | 211 | |
9b2260cb | 212 | printf("attempting to read extended header in offset %lu\n", offset); |
9b80ddf3 AL |
213 | #endif |
214 | ||
cf2ab8fc | 215 | ret = bdrv_pread(bs->file, offset, &ext, sizeof(ext)); |
3ef6c40a HR |
216 | if (ret < 0) { |
217 | error_setg_errno(errp, -ret, "qcow2_read_extension: ERROR: " | |
218 | "pread fail from offset %" PRIu64, offset); | |
9b80ddf3 AL |
219 | return 1; |
220 | } | |
3b698f52 PM |
221 | ext.magic = be32_to_cpu(ext.magic); |
222 | ext.len = be32_to_cpu(ext.len); | |
9b80ddf3 AL |
223 | offset += sizeof(ext); |
224 | #ifdef DEBUG_EXT | |
225 | printf("ext.magic = 0x%x\n", ext.magic); | |
226 | #endif | |
2ebafc85 | 227 | if (offset > end_offset || ext.len > end_offset - offset) { |
3ef6c40a | 228 | error_setg(errp, "Header extension too large"); |
64ca6aee KW |
229 | return -EINVAL; |
230 | } | |
231 | ||
9b80ddf3 | 232 | switch (ext.magic) { |
7c80ab3f | 233 | case QCOW2_EXT_MAGIC_END: |
9b80ddf3 | 234 | return 0; |
f965509c | 235 | |
7c80ab3f | 236 | case QCOW2_EXT_MAGIC_BACKING_FORMAT: |
f965509c | 237 | if (ext.len >= sizeof(bs->backing_format)) { |
521b2b5d HR |
238 | error_setg(errp, "ERROR: ext_backing_format: len=%" PRIu32 |
239 | " too large (>=%zu)", ext.len, | |
240 | sizeof(bs->backing_format)); | |
f965509c AL |
241 | return 2; |
242 | } | |
cf2ab8fc | 243 | ret = bdrv_pread(bs->file, offset, bs->backing_format, ext.len); |
3ef6c40a HR |
244 | if (ret < 0) { |
245 | error_setg_errno(errp, -ret, "ERROR: ext_backing_format: " | |
246 | "Could not read format name"); | |
f965509c | 247 | return 3; |
3ef6c40a | 248 | } |
f965509c | 249 | bs->backing_format[ext.len] = '\0'; |
e4603fe1 | 250 | s->image_backing_format = g_strdup(bs->backing_format); |
f965509c AL |
251 | #ifdef DEBUG_EXT |
252 | printf("Qcow2: Got format extension %s\n", bs->backing_format); | |
253 | #endif | |
f965509c AL |
254 | break; |
255 | ||
cfcc4c62 KW |
256 | case QCOW2_EXT_MAGIC_FEATURE_TABLE: |
257 | if (p_feature_table != NULL) { | |
258 | void* feature_table = g_malloc0(ext.len + 2 * sizeof(Qcow2Feature)); | |
cf2ab8fc | 259 | ret = bdrv_pread(bs->file, offset , feature_table, ext.len); |
cfcc4c62 | 260 | if (ret < 0) { |
3ef6c40a HR |
261 | error_setg_errno(errp, -ret, "ERROR: ext_feature_table: " |
262 | "Could not read table"); | |
cfcc4c62 KW |
263 | return ret; |
264 | } | |
265 | ||
266 | *p_feature_table = feature_table; | |
267 | } | |
268 | break; | |
269 | ||
4652b8f3 DB |
270 | case QCOW2_EXT_MAGIC_CRYPTO_HEADER: { |
271 | unsigned int cflags = 0; | |
272 | if (s->crypt_method_header != QCOW_CRYPT_LUKS) { | |
273 | error_setg(errp, "CRYPTO header extension only " | |
274 | "expected with LUKS encryption method"); | |
275 | return -EINVAL; | |
276 | } | |
277 | if (ext.len != sizeof(Qcow2CryptoHeaderExtension)) { | |
278 | error_setg(errp, "CRYPTO header extension size %u, " | |
279 | "but expected size %zu", ext.len, | |
280 | sizeof(Qcow2CryptoHeaderExtension)); | |
281 | return -EINVAL; | |
282 | } | |
283 | ||
284 | ret = bdrv_pread(bs->file, offset, &s->crypto_header, ext.len); | |
285 | if (ret < 0) { | |
286 | error_setg_errno(errp, -ret, | |
287 | "Unable to read CRYPTO header extension"); | |
288 | return ret; | |
289 | } | |
3b698f52 PM |
290 | s->crypto_header.offset = be64_to_cpu(s->crypto_header.offset); |
291 | s->crypto_header.length = be64_to_cpu(s->crypto_header.length); | |
4652b8f3 DB |
292 | |
293 | if ((s->crypto_header.offset % s->cluster_size) != 0) { | |
294 | error_setg(errp, "Encryption header offset '%" PRIu64 "' is " | |
295 | "not a multiple of cluster size '%u'", | |
296 | s->crypto_header.offset, s->cluster_size); | |
297 | return -EINVAL; | |
298 | } | |
299 | ||
300 | if (flags & BDRV_O_NO_IO) { | |
301 | cflags |= QCRYPTO_BLOCK_OPEN_NO_IO; | |
302 | } | |
1cd9a787 | 303 | s->crypto = qcrypto_block_open(s->crypto_opts, "encrypt.", |
4652b8f3 | 304 | qcow2_crypto_hdr_read_func, |
c972fa12 | 305 | bs, cflags, 1, errp); |
4652b8f3 DB |
306 | if (!s->crypto) { |
307 | return -EINVAL; | |
308 | } | |
309 | } break; | |
310 | ||
88ddffae VSO |
311 | case QCOW2_EXT_MAGIC_BITMAPS: |
312 | if (ext.len != sizeof(bitmaps_ext)) { | |
313 | error_setg_errno(errp, -ret, "bitmaps_ext: " | |
314 | "Invalid extension length"); | |
315 | return -EINVAL; | |
316 | } | |
317 | ||
318 | if (!(s->autoclear_features & QCOW2_AUTOCLEAR_BITMAPS)) { | |
c9ceb3ec HR |
319 | if (s->qcow_version < 3) { |
320 | /* Let's be a bit more specific */ | |
321 | warn_report("This qcow2 v2 image contains bitmaps, but " | |
322 | "they may have been modified by a program " | |
323 | "without persistent bitmap support; so now " | |
324 | "they must all be considered inconsistent"); | |
325 | } else { | |
326 | warn_report("a program lacking bitmap support " | |
327 | "modified this file, so all bitmaps are now " | |
328 | "considered inconsistent"); | |
329 | } | |
55d527a9 AF |
330 | error_printf("Some clusters may be leaked, " |
331 | "run 'qemu-img check -r' on the image " | |
88ddffae VSO |
332 | "file to fix."); |
333 | if (need_update_header != NULL) { | |
334 | /* Updating is needed to drop invalid bitmap extension. */ | |
335 | *need_update_header = true; | |
336 | } | |
337 | break; | |
338 | } | |
339 | ||
340 | ret = bdrv_pread(bs->file, offset, &bitmaps_ext, ext.len); | |
341 | if (ret < 0) { | |
342 | error_setg_errno(errp, -ret, "bitmaps_ext: " | |
343 | "Could not read ext header"); | |
344 | return ret; | |
345 | } | |
346 | ||
347 | if (bitmaps_ext.reserved32 != 0) { | |
348 | error_setg_errno(errp, -ret, "bitmaps_ext: " | |
349 | "Reserved field is not zero"); | |
350 | return -EINVAL; | |
351 | } | |
352 | ||
3b698f52 PM |
353 | bitmaps_ext.nb_bitmaps = be32_to_cpu(bitmaps_ext.nb_bitmaps); |
354 | bitmaps_ext.bitmap_directory_size = | |
355 | be64_to_cpu(bitmaps_ext.bitmap_directory_size); | |
356 | bitmaps_ext.bitmap_directory_offset = | |
357 | be64_to_cpu(bitmaps_ext.bitmap_directory_offset); | |
88ddffae VSO |
358 | |
359 | if (bitmaps_ext.nb_bitmaps > QCOW2_MAX_BITMAPS) { | |
360 | error_setg(errp, | |
361 | "bitmaps_ext: Image has %" PRIu32 " bitmaps, " | |
362 | "exceeding the QEMU supported maximum of %d", | |
363 | bitmaps_ext.nb_bitmaps, QCOW2_MAX_BITMAPS); | |
364 | return -EINVAL; | |
365 | } | |
366 | ||
367 | if (bitmaps_ext.nb_bitmaps == 0) { | |
368 | error_setg(errp, "found bitmaps extension with zero bitmaps"); | |
369 | return -EINVAL; | |
370 | } | |
371 | ||
372 | if (bitmaps_ext.bitmap_directory_offset & (s->cluster_size - 1)) { | |
373 | error_setg(errp, "bitmaps_ext: " | |
374 | "invalid bitmap directory offset"); | |
375 | return -EINVAL; | |
376 | } | |
377 | ||
378 | if (bitmaps_ext.bitmap_directory_size > | |
379 | QCOW2_MAX_BITMAP_DIRECTORY_SIZE) { | |
380 | error_setg(errp, "bitmaps_ext: " | |
381 | "bitmap directory size (%" PRIu64 ") exceeds " | |
382 | "the maximum supported size (%d)", | |
383 | bitmaps_ext.bitmap_directory_size, | |
384 | QCOW2_MAX_BITMAP_DIRECTORY_SIZE); | |
385 | return -EINVAL; | |
386 | } | |
387 | ||
388 | s->nb_bitmaps = bitmaps_ext.nb_bitmaps; | |
389 | s->bitmap_directory_offset = | |
390 | bitmaps_ext.bitmap_directory_offset; | |
391 | s->bitmap_directory_size = | |
392 | bitmaps_ext.bitmap_directory_size; | |
393 | ||
394 | #ifdef DEBUG_EXT | |
395 | printf("Qcow2: Got bitmaps extension: " | |
396 | "offset=%" PRIu64 " nb_bitmaps=%" PRIu32 "\n", | |
397 | s->bitmap_directory_offset, s->nb_bitmaps); | |
398 | #endif | |
399 | break; | |
400 | ||
9b80ddf3 | 401 | default: |
75bab85c | 402 | /* unknown magic - save it in case we need to rewrite the header */ |
4096974e EB |
403 | /* If you add a new feature, make sure to also update the fast |
404 | * path of qcow2_make_empty() to deal with it. */ | |
75bab85c KW |
405 | { |
406 | Qcow2UnknownHeaderExtension *uext; | |
407 | ||
408 | uext = g_malloc0(sizeof(*uext) + ext.len); | |
409 | uext->magic = ext.magic; | |
410 | uext->len = ext.len; | |
411 | QLIST_INSERT_HEAD(&s->unknown_header_ext, uext, next); | |
412 | ||
cf2ab8fc | 413 | ret = bdrv_pread(bs->file, offset , uext->data, uext->len); |
75bab85c | 414 | if (ret < 0) { |
3ef6c40a HR |
415 | error_setg_errno(errp, -ret, "ERROR: unknown extension: " |
416 | "Could not read data"); | |
75bab85c KW |
417 | return ret; |
418 | } | |
75bab85c | 419 | } |
9b80ddf3 AL |
420 | break; |
421 | } | |
fd29b4bb KW |
422 | |
423 | offset += ((ext.len + 7) & ~7); | |
9b80ddf3 AL |
424 | } |
425 | ||
426 | return 0; | |
427 | } | |
428 | ||
75bab85c KW |
429 | static void cleanup_unknown_header_ext(BlockDriverState *bs) |
430 | { | |
ff99129a | 431 | BDRVQcow2State *s = bs->opaque; |
75bab85c KW |
432 | Qcow2UnknownHeaderExtension *uext, *next; |
433 | ||
434 | QLIST_FOREACH_SAFE(uext, &s->unknown_header_ext, next, next) { | |
435 | QLIST_REMOVE(uext, next); | |
436 | g_free(uext); | |
437 | } | |
438 | } | |
9b80ddf3 | 439 | |
a55448b3 HR |
440 | static void report_unsupported_feature(Error **errp, Qcow2Feature *table, |
441 | uint64_t mask) | |
cfcc4c62 | 442 | { |
12ac6d3d KW |
443 | char *features = g_strdup(""); |
444 | char *old; | |
445 | ||
cfcc4c62 KW |
446 | while (table && table->name[0] != '\0') { |
447 | if (table->type == QCOW2_FEAT_TYPE_INCOMPATIBLE) { | |
12ac6d3d KW |
448 | if (mask & (1ULL << table->bit)) { |
449 | old = features; | |
450 | features = g_strdup_printf("%s%s%.46s", old, *old ? ", " : "", | |
451 | table->name); | |
452 | g_free(old); | |
453 | mask &= ~(1ULL << table->bit); | |
cfcc4c62 KW |
454 | } |
455 | } | |
456 | table++; | |
457 | } | |
458 | ||
459 | if (mask) { | |
12ac6d3d KW |
460 | old = features; |
461 | features = g_strdup_printf("%s%sUnknown incompatible feature: %" PRIx64, | |
462 | old, *old ? ", " : "", mask); | |
463 | g_free(old); | |
cfcc4c62 | 464 | } |
12ac6d3d | 465 | |
a55448b3 | 466 | error_setg(errp, "Unsupported qcow2 feature(s): %s", features); |
12ac6d3d | 467 | g_free(features); |
cfcc4c62 KW |
468 | } |
469 | ||
bfe8043e SH |
470 | /* |
471 | * Sets the dirty bit and flushes afterwards if necessary. | |
472 | * | |
473 | * The incompatible_features bit is only set if the image file header was | |
474 | * updated successfully. Therefore it is not required to check the return | |
475 | * value of this function. | |
476 | */ | |
280d3735 | 477 | int qcow2_mark_dirty(BlockDriverState *bs) |
bfe8043e | 478 | { |
ff99129a | 479 | BDRVQcow2State *s = bs->opaque; |
bfe8043e SH |
480 | uint64_t val; |
481 | int ret; | |
482 | ||
483 | assert(s->qcow_version >= 3); | |
484 | ||
485 | if (s->incompatible_features & QCOW2_INCOMPAT_DIRTY) { | |
486 | return 0; /* already dirty */ | |
487 | } | |
488 | ||
489 | val = cpu_to_be64(s->incompatible_features | QCOW2_INCOMPAT_DIRTY); | |
d9ca2ea2 | 490 | ret = bdrv_pwrite(bs->file, offsetof(QCowHeader, incompatible_features), |
bfe8043e SH |
491 | &val, sizeof(val)); |
492 | if (ret < 0) { | |
493 | return ret; | |
494 | } | |
9a4f4c31 | 495 | ret = bdrv_flush(bs->file->bs); |
bfe8043e SH |
496 | if (ret < 0) { |
497 | return ret; | |
498 | } | |
499 | ||
500 | /* Only treat image as dirty if the header was updated successfully */ | |
501 | s->incompatible_features |= QCOW2_INCOMPAT_DIRTY; | |
502 | return 0; | |
503 | } | |
504 | ||
c61d0004 SH |
505 | /* |
506 | * Clears the dirty bit and flushes before if necessary. Only call this | |
507 | * function when there are no pending requests, it does not guard against | |
508 | * concurrent requests dirtying the image. | |
509 | */ | |
510 | static int qcow2_mark_clean(BlockDriverState *bs) | |
511 | { | |
ff99129a | 512 | BDRVQcow2State *s = bs->opaque; |
c61d0004 SH |
513 | |
514 | if (s->incompatible_features & QCOW2_INCOMPAT_DIRTY) { | |
4c2e5f8f KW |
515 | int ret; |
516 | ||
517 | s->incompatible_features &= ~QCOW2_INCOMPAT_DIRTY; | |
518 | ||
8b220eb7 | 519 | ret = qcow2_flush_caches(bs); |
c61d0004 SH |
520 | if (ret < 0) { |
521 | return ret; | |
522 | } | |
523 | ||
c61d0004 SH |
524 | return qcow2_update_header(bs); |
525 | } | |
526 | return 0; | |
527 | } | |
528 | ||
69c98726 HR |
529 | /* |
530 | * Marks the image as corrupt. | |
531 | */ | |
532 | int qcow2_mark_corrupt(BlockDriverState *bs) | |
533 | { | |
ff99129a | 534 | BDRVQcow2State *s = bs->opaque; |
69c98726 HR |
535 | |
536 | s->incompatible_features |= QCOW2_INCOMPAT_CORRUPT; | |
537 | return qcow2_update_header(bs); | |
538 | } | |
539 | ||
540 | /* | |
541 | * Marks the image as consistent, i.e., unsets the corrupt bit, and flushes | |
542 | * before if necessary. | |
543 | */ | |
544 | int qcow2_mark_consistent(BlockDriverState *bs) | |
545 | { | |
ff99129a | 546 | BDRVQcow2State *s = bs->opaque; |
69c98726 HR |
547 | |
548 | if (s->incompatible_features & QCOW2_INCOMPAT_CORRUPT) { | |
8b220eb7 | 549 | int ret = qcow2_flush_caches(bs); |
69c98726 HR |
550 | if (ret < 0) { |
551 | return ret; | |
552 | } | |
553 | ||
554 | s->incompatible_features &= ~QCOW2_INCOMPAT_CORRUPT; | |
555 | return qcow2_update_header(bs); | |
556 | } | |
557 | return 0; | |
558 | } | |
559 | ||
2fd61638 PB |
560 | static int coroutine_fn qcow2_co_check_locked(BlockDriverState *bs, |
561 | BdrvCheckResult *result, | |
562 | BdrvCheckMode fix) | |
acbe5982 SH |
563 | { |
564 | int ret = qcow2_check_refcounts(bs, result, fix); | |
565 | if (ret < 0) { | |
566 | return ret; | |
567 | } | |
568 | ||
569 | if (fix && result->check_errors == 0 && result->corruptions == 0) { | |
24530f3e HR |
570 | ret = qcow2_mark_clean(bs); |
571 | if (ret < 0) { | |
572 | return ret; | |
573 | } | |
574 | return qcow2_mark_consistent(bs); | |
acbe5982 SH |
575 | } |
576 | return ret; | |
577 | } | |
578 | ||
2fd61638 PB |
579 | static int coroutine_fn qcow2_co_check(BlockDriverState *bs, |
580 | BdrvCheckResult *result, | |
581 | BdrvCheckMode fix) | |
582 | { | |
583 | BDRVQcow2State *s = bs->opaque; | |
584 | int ret; | |
585 | ||
586 | qemu_co_mutex_lock(&s->lock); | |
587 | ret = qcow2_co_check_locked(bs, result, fix); | |
588 | qemu_co_mutex_unlock(&s->lock); | |
589 | return ret; | |
590 | } | |
591 | ||
0cf0e598 AG |
592 | int qcow2_validate_table(BlockDriverState *bs, uint64_t offset, |
593 | uint64_t entries, size_t entry_len, | |
594 | int64_t max_size_bytes, const char *table_name, | |
595 | Error **errp) | |
8c7de283 | 596 | { |
ff99129a | 597 | BDRVQcow2State *s = bs->opaque; |
8c7de283 | 598 | |
0cf0e598 AG |
599 | if (entries > max_size_bytes / entry_len) { |
600 | error_setg(errp, "%s too large", table_name); | |
601 | return -EFBIG; | |
8c7de283 KW |
602 | } |
603 | ||
0cf0e598 AG |
604 | /* Use signed INT64_MAX as the maximum even for uint64_t header fields, |
605 | * because values will be passed to qemu functions taking int64_t. */ | |
606 | if ((INT64_MAX - entries * entry_len < offset) || | |
607 | (offset_into_cluster(s, offset) != 0)) { | |
608 | error_setg(errp, "%s offset invalid", table_name); | |
8c7de283 KW |
609 | return -EINVAL; |
610 | } | |
611 | ||
612 | return 0; | |
613 | } | |
614 | ||
74c4510a KW |
615 | static QemuOptsList qcow2_runtime_opts = { |
616 | .name = "qcow2", | |
617 | .head = QTAILQ_HEAD_INITIALIZER(qcow2_runtime_opts.head), | |
618 | .desc = { | |
619 | { | |
64aa99d3 | 620 | .name = QCOW2_OPT_LAZY_REFCOUNTS, |
74c4510a KW |
621 | .type = QEMU_OPT_BOOL, |
622 | .help = "Postpone refcount updates", | |
623 | }, | |
67af674e KW |
624 | { |
625 | .name = QCOW2_OPT_DISCARD_REQUEST, | |
626 | .type = QEMU_OPT_BOOL, | |
627 | .help = "Pass guest discard requests to the layer below", | |
628 | }, | |
629 | { | |
630 | .name = QCOW2_OPT_DISCARD_SNAPSHOT, | |
631 | .type = QEMU_OPT_BOOL, | |
632 | .help = "Generate discard requests when snapshot related space " | |
633 | "is freed", | |
634 | }, | |
635 | { | |
636 | .name = QCOW2_OPT_DISCARD_OTHER, | |
637 | .type = QEMU_OPT_BOOL, | |
638 | .help = "Generate discard requests when other clusters are freed", | |
639 | }, | |
05de7e86 HR |
640 | { |
641 | .name = QCOW2_OPT_OVERLAP, | |
642 | .type = QEMU_OPT_STRING, | |
643 | .help = "Selects which overlap checks to perform from a range of " | |
644 | "templates (none, constant, cached, all)", | |
645 | }, | |
ee42b5ce HR |
646 | { |
647 | .name = QCOW2_OPT_OVERLAP_TEMPLATE, | |
648 | .type = QEMU_OPT_STRING, | |
649 | .help = "Selects which overlap checks to perform from a range of " | |
650 | "templates (none, constant, cached, all)", | |
651 | }, | |
05de7e86 HR |
652 | { |
653 | .name = QCOW2_OPT_OVERLAP_MAIN_HEADER, | |
654 | .type = QEMU_OPT_BOOL, | |
655 | .help = "Check for unintended writes into the main qcow2 header", | |
656 | }, | |
657 | { | |
658 | .name = QCOW2_OPT_OVERLAP_ACTIVE_L1, | |
659 | .type = QEMU_OPT_BOOL, | |
660 | .help = "Check for unintended writes into the active L1 table", | |
661 | }, | |
662 | { | |
663 | .name = QCOW2_OPT_OVERLAP_ACTIVE_L2, | |
664 | .type = QEMU_OPT_BOOL, | |
665 | .help = "Check for unintended writes into an active L2 table", | |
666 | }, | |
667 | { | |
668 | .name = QCOW2_OPT_OVERLAP_REFCOUNT_TABLE, | |
669 | .type = QEMU_OPT_BOOL, | |
670 | .help = "Check for unintended writes into the refcount table", | |
671 | }, | |
672 | { | |
673 | .name = QCOW2_OPT_OVERLAP_REFCOUNT_BLOCK, | |
674 | .type = QEMU_OPT_BOOL, | |
675 | .help = "Check for unintended writes into a refcount block", | |
676 | }, | |
677 | { | |
678 | .name = QCOW2_OPT_OVERLAP_SNAPSHOT_TABLE, | |
679 | .type = QEMU_OPT_BOOL, | |
680 | .help = "Check for unintended writes into the snapshot table", | |
681 | }, | |
682 | { | |
683 | .name = QCOW2_OPT_OVERLAP_INACTIVE_L1, | |
684 | .type = QEMU_OPT_BOOL, | |
685 | .help = "Check for unintended writes into an inactive L1 table", | |
686 | }, | |
687 | { | |
688 | .name = QCOW2_OPT_OVERLAP_INACTIVE_L2, | |
689 | .type = QEMU_OPT_BOOL, | |
690 | .help = "Check for unintended writes into an inactive L2 table", | |
691 | }, | |
0e4e4318 VSO |
692 | { |
693 | .name = QCOW2_OPT_OVERLAP_BITMAP_DIRECTORY, | |
694 | .type = QEMU_OPT_BOOL, | |
695 | .help = "Check for unintended writes into the bitmap directory", | |
696 | }, | |
6c1c8d5d HR |
697 | { |
698 | .name = QCOW2_OPT_CACHE_SIZE, | |
699 | .type = QEMU_OPT_SIZE, | |
700 | .help = "Maximum combined metadata (L2 tables and refcount blocks) " | |
701 | "cache size", | |
702 | }, | |
703 | { | |
704 | .name = QCOW2_OPT_L2_CACHE_SIZE, | |
705 | .type = QEMU_OPT_SIZE, | |
706 | .help = "Maximum L2 table cache size", | |
707 | }, | |
1221fe6f AG |
708 | { |
709 | .name = QCOW2_OPT_L2_CACHE_ENTRY_SIZE, | |
710 | .type = QEMU_OPT_SIZE, | |
711 | .help = "Size of each entry in the L2 cache", | |
712 | }, | |
6c1c8d5d HR |
713 | { |
714 | .name = QCOW2_OPT_REFCOUNT_CACHE_SIZE, | |
715 | .type = QEMU_OPT_SIZE, | |
716 | .help = "Maximum refcount block cache size", | |
717 | }, | |
279621c0 AG |
718 | { |
719 | .name = QCOW2_OPT_CACHE_CLEAN_INTERVAL, | |
720 | .type = QEMU_OPT_NUMBER, | |
721 | .help = "Clean unused cache entries after this time (in seconds)", | |
722 | }, | |
4652b8f3 DB |
723 | BLOCK_CRYPTO_OPT_DEF_KEY_SECRET("encrypt.", |
724 | "ID of secret providing qcow2 AES key or LUKS passphrase"), | |
74c4510a KW |
725 | { /* end of list */ } |
726 | }, | |
727 | }; | |
728 | ||
4092e99d | 729 | static const char *overlap_bool_option_names[QCOW2_OL_MAX_BITNR] = { |
0e4e4318 VSO |
730 | [QCOW2_OL_MAIN_HEADER_BITNR] = QCOW2_OPT_OVERLAP_MAIN_HEADER, |
731 | [QCOW2_OL_ACTIVE_L1_BITNR] = QCOW2_OPT_OVERLAP_ACTIVE_L1, | |
732 | [QCOW2_OL_ACTIVE_L2_BITNR] = QCOW2_OPT_OVERLAP_ACTIVE_L2, | |
733 | [QCOW2_OL_REFCOUNT_TABLE_BITNR] = QCOW2_OPT_OVERLAP_REFCOUNT_TABLE, | |
734 | [QCOW2_OL_REFCOUNT_BLOCK_BITNR] = QCOW2_OPT_OVERLAP_REFCOUNT_BLOCK, | |
735 | [QCOW2_OL_SNAPSHOT_TABLE_BITNR] = QCOW2_OPT_OVERLAP_SNAPSHOT_TABLE, | |
736 | [QCOW2_OL_INACTIVE_L1_BITNR] = QCOW2_OPT_OVERLAP_INACTIVE_L1, | |
737 | [QCOW2_OL_INACTIVE_L2_BITNR] = QCOW2_OPT_OVERLAP_INACTIVE_L2, | |
738 | [QCOW2_OL_BITMAP_DIRECTORY_BITNR] = QCOW2_OPT_OVERLAP_BITMAP_DIRECTORY, | |
4092e99d HR |
739 | }; |
740 | ||
279621c0 AG |
741 | static void cache_clean_timer_cb(void *opaque) |
742 | { | |
743 | BlockDriverState *bs = opaque; | |
ff99129a | 744 | BDRVQcow2State *s = bs->opaque; |
b2f68bff AG |
745 | qcow2_cache_clean_unused(s->l2_table_cache); |
746 | qcow2_cache_clean_unused(s->refcount_block_cache); | |
279621c0 AG |
747 | timer_mod(s->cache_clean_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + |
748 | (int64_t) s->cache_clean_interval * 1000); | |
749 | } | |
750 | ||
751 | static void cache_clean_timer_init(BlockDriverState *bs, AioContext *context) | |
752 | { | |
ff99129a | 753 | BDRVQcow2State *s = bs->opaque; |
279621c0 AG |
754 | if (s->cache_clean_interval > 0) { |
755 | s->cache_clean_timer = aio_timer_new(context, QEMU_CLOCK_VIRTUAL, | |
756 | SCALE_MS, cache_clean_timer_cb, | |
757 | bs); | |
758 | timer_mod(s->cache_clean_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + | |
759 | (int64_t) s->cache_clean_interval * 1000); | |
760 | } | |
761 | } | |
762 | ||
763 | static void cache_clean_timer_del(BlockDriverState *bs) | |
764 | { | |
ff99129a | 765 | BDRVQcow2State *s = bs->opaque; |
279621c0 AG |
766 | if (s->cache_clean_timer) { |
767 | timer_del(s->cache_clean_timer); | |
768 | timer_free(s->cache_clean_timer); | |
769 | s->cache_clean_timer = NULL; | |
770 | } | |
771 | } | |
772 | ||
773 | static void qcow2_detach_aio_context(BlockDriverState *bs) | |
774 | { | |
775 | cache_clean_timer_del(bs); | |
776 | } | |
777 | ||
778 | static void qcow2_attach_aio_context(BlockDriverState *bs, | |
779 | AioContext *new_context) | |
780 | { | |
781 | cache_clean_timer_init(bs, new_context); | |
782 | } | |
783 | ||
bc85ef26 HR |
784 | static void read_cache_sizes(BlockDriverState *bs, QemuOpts *opts, |
785 | uint64_t *l2_cache_size, | |
1221fe6f | 786 | uint64_t *l2_cache_entry_size, |
6c1c8d5d HR |
787 | uint64_t *refcount_cache_size, Error **errp) |
788 | { | |
ff99129a | 789 | BDRVQcow2State *s = bs->opaque; |
b749562d | 790 | uint64_t combined_cache_size, l2_cache_max_setting; |
6c1c8d5d | 791 | bool l2_cache_size_set, refcount_cache_size_set, combined_cache_size_set; |
af39bd0d | 792 | bool l2_cache_entry_size_set; |
7af5eea9 | 793 | int min_refcount_cache = MIN_REFCOUNT_CACHE_SIZE * s->cluster_size; |
b749562d LB |
794 | uint64_t virtual_disk_size = bs->total_sectors * BDRV_SECTOR_SIZE; |
795 | uint64_t max_l2_cache = virtual_disk_size / (s->cluster_size / 8); | |
6c1c8d5d HR |
796 | |
797 | combined_cache_size_set = qemu_opt_get(opts, QCOW2_OPT_CACHE_SIZE); | |
798 | l2_cache_size_set = qemu_opt_get(opts, QCOW2_OPT_L2_CACHE_SIZE); | |
799 | refcount_cache_size_set = qemu_opt_get(opts, QCOW2_OPT_REFCOUNT_CACHE_SIZE); | |
af39bd0d | 800 | l2_cache_entry_size_set = qemu_opt_get(opts, QCOW2_OPT_L2_CACHE_ENTRY_SIZE); |
6c1c8d5d HR |
801 | |
802 | combined_cache_size = qemu_opt_get_size(opts, QCOW2_OPT_CACHE_SIZE, 0); | |
b749562d LB |
803 | l2_cache_max_setting = qemu_opt_get_size(opts, QCOW2_OPT_L2_CACHE_SIZE, |
804 | DEFAULT_L2_CACHE_MAX_SIZE); | |
6c1c8d5d HR |
805 | *refcount_cache_size = qemu_opt_get_size(opts, |
806 | QCOW2_OPT_REFCOUNT_CACHE_SIZE, 0); | |
807 | ||
1221fe6f AG |
808 | *l2_cache_entry_size = qemu_opt_get_size( |
809 | opts, QCOW2_OPT_L2_CACHE_ENTRY_SIZE, s->cluster_size); | |
810 | ||
b749562d LB |
811 | *l2_cache_size = MIN(max_l2_cache, l2_cache_max_setting); |
812 | ||
6c1c8d5d HR |
813 | if (combined_cache_size_set) { |
814 | if (l2_cache_size_set && refcount_cache_size_set) { | |
815 | error_setg(errp, QCOW2_OPT_CACHE_SIZE ", " QCOW2_OPT_L2_CACHE_SIZE | |
816 | " and " QCOW2_OPT_REFCOUNT_CACHE_SIZE " may not be set " | |
308999e9 | 817 | "at the same time"); |
6c1c8d5d | 818 | return; |
b749562d LB |
819 | } else if (l2_cache_size_set && |
820 | (l2_cache_max_setting > combined_cache_size)) { | |
6c1c8d5d HR |
821 | error_setg(errp, QCOW2_OPT_L2_CACHE_SIZE " may not exceed " |
822 | QCOW2_OPT_CACHE_SIZE); | |
823 | return; | |
824 | } else if (*refcount_cache_size > combined_cache_size) { | |
825 | error_setg(errp, QCOW2_OPT_REFCOUNT_CACHE_SIZE " may not exceed " | |
826 | QCOW2_OPT_CACHE_SIZE); | |
827 | return; | |
828 | } | |
829 | ||
830 | if (l2_cache_size_set) { | |
831 | *refcount_cache_size = combined_cache_size - *l2_cache_size; | |
832 | } else if (refcount_cache_size_set) { | |
833 | *l2_cache_size = combined_cache_size - *refcount_cache_size; | |
834 | } else { | |
52253998 AG |
835 | /* Assign as much memory as possible to the L2 cache, and |
836 | * use the remainder for the refcount cache */ | |
837 | if (combined_cache_size >= max_l2_cache + min_refcount_cache) { | |
838 | *l2_cache_size = max_l2_cache; | |
839 | *refcount_cache_size = combined_cache_size - *l2_cache_size; | |
840 | } else { | |
841 | *refcount_cache_size = | |
842 | MIN(combined_cache_size, min_refcount_cache); | |
843 | *l2_cache_size = combined_cache_size - *refcount_cache_size; | |
844 | } | |
6c1c8d5d | 845 | } |
6c1c8d5d | 846 | } |
af39bd0d AG |
847 | |
848 | /* | |
849 | * If the L2 cache is not enough to cover the whole disk then | |
850 | * default to 4KB entries. Smaller entries reduce the cost of | |
851 | * loads and evictions and increase I/O performance. | |
852 | */ | |
853 | if (*l2_cache_size < max_l2_cache && !l2_cache_entry_size_set) { | |
854 | *l2_cache_entry_size = MIN(s->cluster_size, 4096); | |
855 | } | |
856 | ||
657ada52 LB |
857 | /* l2_cache_size and refcount_cache_size are ensured to have at least |
858 | * their minimum values in qcow2_update_options_prepare() */ | |
1221fe6f AG |
859 | |
860 | if (*l2_cache_entry_size < (1 << MIN_CLUSTER_BITS) || | |
861 | *l2_cache_entry_size > s->cluster_size || | |
862 | !is_power_of_2(*l2_cache_entry_size)) { | |
863 | error_setg(errp, "L2 cache entry size must be a power of two " | |
864 | "between %d and the cluster size (%d)", | |
865 | 1 << MIN_CLUSTER_BITS, s->cluster_size); | |
866 | return; | |
867 | } | |
6c1c8d5d HR |
868 | } |
869 | ||
ee55b173 KW |
870 | typedef struct Qcow2ReopenState { |
871 | Qcow2Cache *l2_table_cache; | |
872 | Qcow2Cache *refcount_block_cache; | |
3c2e511a | 873 | int l2_slice_size; /* Number of entries in a slice of the L2 table */ |
ee55b173 KW |
874 | bool use_lazy_refcounts; |
875 | int overlap_check; | |
876 | bool discard_passthrough[QCOW2_DISCARD_MAX]; | |
877 | uint64_t cache_clean_interval; | |
b25b387f | 878 | QCryptoBlockOpenOptions *crypto_opts; /* Disk encryption runtime options */ |
ee55b173 KW |
879 | } Qcow2ReopenState; |
880 | ||
881 | static int qcow2_update_options_prepare(BlockDriverState *bs, | |
882 | Qcow2ReopenState *r, | |
883 | QDict *options, int flags, | |
884 | Error **errp) | |
4c75d1a1 KW |
885 | { |
886 | BDRVQcow2State *s = bs->opaque; | |
94edf3fb | 887 | QemuOpts *opts = NULL; |
4c75d1a1 KW |
888 | const char *opt_overlap_check, *opt_overlap_check_template; |
889 | int overlap_check_template = 0; | |
1221fe6f | 890 | uint64_t l2_cache_size, l2_cache_entry_size, refcount_cache_size; |
4c75d1a1 | 891 | int i; |
b25b387f DB |
892 | const char *encryptfmt; |
893 | QDict *encryptopts = NULL; | |
94edf3fb | 894 | Error *local_err = NULL; |
4c75d1a1 KW |
895 | int ret; |
896 | ||
b25b387f DB |
897 | qdict_extract_subqdict(options, &encryptopts, "encrypt."); |
898 | encryptfmt = qdict_get_try_str(encryptopts, "format"); | |
899 | ||
94edf3fb KW |
900 | opts = qemu_opts_create(&qcow2_runtime_opts, NULL, 0, &error_abort); |
901 | qemu_opts_absorb_qdict(opts, options, &local_err); | |
902 | if (local_err) { | |
903 | error_propagate(errp, local_err); | |
904 | ret = -EINVAL; | |
905 | goto fail; | |
906 | } | |
907 | ||
908 | /* get L2 table/refcount block cache size from command line options */ | |
1221fe6f AG |
909 | read_cache_sizes(bs, opts, &l2_cache_size, &l2_cache_entry_size, |
910 | &refcount_cache_size, &local_err); | |
94edf3fb KW |
911 | if (local_err) { |
912 | error_propagate(errp, local_err); | |
913 | ret = -EINVAL; | |
914 | goto fail; | |
915 | } | |
916 | ||
1221fe6f | 917 | l2_cache_size /= l2_cache_entry_size; |
94edf3fb KW |
918 | if (l2_cache_size < MIN_L2_CACHE_SIZE) { |
919 | l2_cache_size = MIN_L2_CACHE_SIZE; | |
920 | } | |
921 | if (l2_cache_size > INT_MAX) { | |
922 | error_setg(errp, "L2 cache size too big"); | |
923 | ret = -EINVAL; | |
924 | goto fail; | |
925 | } | |
926 | ||
927 | refcount_cache_size /= s->cluster_size; | |
928 | if (refcount_cache_size < MIN_REFCOUNT_CACHE_SIZE) { | |
929 | refcount_cache_size = MIN_REFCOUNT_CACHE_SIZE; | |
930 | } | |
931 | if (refcount_cache_size > INT_MAX) { | |
932 | error_setg(errp, "Refcount cache size too big"); | |
933 | ret = -EINVAL; | |
934 | goto fail; | |
935 | } | |
936 | ||
5b0959a7 KW |
937 | /* alloc new L2 table/refcount block cache, flush old one */ |
938 | if (s->l2_table_cache) { | |
939 | ret = qcow2_cache_flush(bs, s->l2_table_cache); | |
940 | if (ret) { | |
941 | error_setg_errno(errp, -ret, "Failed to flush the L2 table cache"); | |
942 | goto fail; | |
943 | } | |
944 | } | |
945 | ||
946 | if (s->refcount_block_cache) { | |
947 | ret = qcow2_cache_flush(bs, s->refcount_block_cache); | |
948 | if (ret) { | |
949 | error_setg_errno(errp, -ret, | |
950 | "Failed to flush the refcount block cache"); | |
951 | goto fail; | |
952 | } | |
953 | } | |
954 | ||
1221fe6f AG |
955 | r->l2_slice_size = l2_cache_entry_size / sizeof(uint64_t); |
956 | r->l2_table_cache = qcow2_cache_create(bs, l2_cache_size, | |
957 | l2_cache_entry_size); | |
958 | r->refcount_block_cache = qcow2_cache_create(bs, refcount_cache_size, | |
959 | s->cluster_size); | |
ee55b173 | 960 | if (r->l2_table_cache == NULL || r->refcount_block_cache == NULL) { |
94edf3fb KW |
961 | error_setg(errp, "Could not allocate metadata caches"); |
962 | ret = -ENOMEM; | |
963 | goto fail; | |
964 | } | |
965 | ||
966 | /* New interval for cache cleanup timer */ | |
ee55b173 | 967 | r->cache_clean_interval = |
5b0959a7 | 968 | qemu_opt_get_number(opts, QCOW2_OPT_CACHE_CLEAN_INTERVAL, |
e957b50b | 969 | DEFAULT_CACHE_CLEAN_INTERVAL); |
91203f08 AG |
970 | #ifndef CONFIG_LINUX |
971 | if (r->cache_clean_interval != 0) { | |
972 | error_setg(errp, QCOW2_OPT_CACHE_CLEAN_INTERVAL | |
973 | " not supported on this host"); | |
974 | ret = -EINVAL; | |
975 | goto fail; | |
976 | } | |
977 | #endif | |
ee55b173 | 978 | if (r->cache_clean_interval > UINT_MAX) { |
94edf3fb KW |
979 | error_setg(errp, "Cache clean interval too big"); |
980 | ret = -EINVAL; | |
981 | goto fail; | |
982 | } | |
94edf3fb | 983 | |
5b0959a7 | 984 | /* lazy-refcounts; flush if going from enabled to disabled */ |
ee55b173 | 985 | r->use_lazy_refcounts = qemu_opt_get_bool(opts, QCOW2_OPT_LAZY_REFCOUNTS, |
4c75d1a1 | 986 | (s->compatible_features & QCOW2_COMPAT_LAZY_REFCOUNTS)); |
ee55b173 | 987 | if (r->use_lazy_refcounts && s->qcow_version < 3) { |
007dbc39 KW |
988 | error_setg(errp, "Lazy refcounts require a qcow2 image with at least " |
989 | "qemu 1.1 compatibility level"); | |
990 | ret = -EINVAL; | |
991 | goto fail; | |
992 | } | |
4c75d1a1 | 993 | |
5b0959a7 KW |
994 | if (s->use_lazy_refcounts && !r->use_lazy_refcounts) { |
995 | ret = qcow2_mark_clean(bs); | |
996 | if (ret < 0) { | |
997 | error_setg_errno(errp, -ret, "Failed to disable lazy refcounts"); | |
998 | goto fail; | |
999 | } | |
1000 | } | |
1001 | ||
007dbc39 | 1002 | /* Overlap check options */ |
4c75d1a1 KW |
1003 | opt_overlap_check = qemu_opt_get(opts, QCOW2_OPT_OVERLAP); |
1004 | opt_overlap_check_template = qemu_opt_get(opts, QCOW2_OPT_OVERLAP_TEMPLATE); | |
1005 | if (opt_overlap_check_template && opt_overlap_check && | |
1006 | strcmp(opt_overlap_check_template, opt_overlap_check)) | |
1007 | { | |
1008 | error_setg(errp, "Conflicting values for qcow2 options '" | |
1009 | QCOW2_OPT_OVERLAP "' ('%s') and '" QCOW2_OPT_OVERLAP_TEMPLATE | |
1010 | "' ('%s')", opt_overlap_check, opt_overlap_check_template); | |
1011 | ret = -EINVAL; | |
1012 | goto fail; | |
1013 | } | |
1014 | if (!opt_overlap_check) { | |
1015 | opt_overlap_check = opt_overlap_check_template ?: "cached"; | |
1016 | } | |
1017 | ||
1018 | if (!strcmp(opt_overlap_check, "none")) { | |
1019 | overlap_check_template = 0; | |
1020 | } else if (!strcmp(opt_overlap_check, "constant")) { | |
1021 | overlap_check_template = QCOW2_OL_CONSTANT; | |
1022 | } else if (!strcmp(opt_overlap_check, "cached")) { | |
1023 | overlap_check_template = QCOW2_OL_CACHED; | |
1024 | } else if (!strcmp(opt_overlap_check, "all")) { | |
1025 | overlap_check_template = QCOW2_OL_ALL; | |
1026 | } else { | |
1027 | error_setg(errp, "Unsupported value '%s' for qcow2 option " | |
1028 | "'overlap-check'. Allowed are any of the following: " | |
1029 | "none, constant, cached, all", opt_overlap_check); | |
1030 | ret = -EINVAL; | |
1031 | goto fail; | |
1032 | } | |
1033 | ||
ee55b173 | 1034 | r->overlap_check = 0; |
4c75d1a1 KW |
1035 | for (i = 0; i < QCOW2_OL_MAX_BITNR; i++) { |
1036 | /* overlap-check defines a template bitmask, but every flag may be | |
1037 | * overwritten through the associated boolean option */ | |
ee55b173 | 1038 | r->overlap_check |= |
4c75d1a1 KW |
1039 | qemu_opt_get_bool(opts, overlap_bool_option_names[i], |
1040 | overlap_check_template & (1 << i)) << i; | |
1041 | } | |
1042 | ||
ee55b173 KW |
1043 | r->discard_passthrough[QCOW2_DISCARD_NEVER] = false; |
1044 | r->discard_passthrough[QCOW2_DISCARD_ALWAYS] = true; | |
1045 | r->discard_passthrough[QCOW2_DISCARD_REQUEST] = | |
007dbc39 KW |
1046 | qemu_opt_get_bool(opts, QCOW2_OPT_DISCARD_REQUEST, |
1047 | flags & BDRV_O_UNMAP); | |
ee55b173 | 1048 | r->discard_passthrough[QCOW2_DISCARD_SNAPSHOT] = |
007dbc39 | 1049 | qemu_opt_get_bool(opts, QCOW2_OPT_DISCARD_SNAPSHOT, true); |
ee55b173 | 1050 | r->discard_passthrough[QCOW2_DISCARD_OTHER] = |
007dbc39 KW |
1051 | qemu_opt_get_bool(opts, QCOW2_OPT_DISCARD_OTHER, false); |
1052 | ||
b25b387f DB |
1053 | switch (s->crypt_method_header) { |
1054 | case QCOW_CRYPT_NONE: | |
1055 | if (encryptfmt) { | |
1056 | error_setg(errp, "No encryption in image header, but options " | |
1057 | "specified format '%s'", encryptfmt); | |
1058 | ret = -EINVAL; | |
1059 | goto fail; | |
1060 | } | |
1061 | break; | |
1062 | ||
1063 | case QCOW_CRYPT_AES: | |
1064 | if (encryptfmt && !g_str_equal(encryptfmt, "aes")) { | |
1065 | error_setg(errp, | |
1066 | "Header reported 'aes' encryption format but " | |
1067 | "options specify '%s'", encryptfmt); | |
1068 | ret = -EINVAL; | |
1069 | goto fail; | |
1070 | } | |
796d3239 MA |
1071 | qdict_put_str(encryptopts, "format", "qcow"); |
1072 | r->crypto_opts = block_crypto_open_opts_init(encryptopts, errp); | |
b25b387f DB |
1073 | break; |
1074 | ||
4652b8f3 DB |
1075 | case QCOW_CRYPT_LUKS: |
1076 | if (encryptfmt && !g_str_equal(encryptfmt, "luks")) { | |
1077 | error_setg(errp, | |
1078 | "Header reported 'luks' encryption format but " | |
1079 | "options specify '%s'", encryptfmt); | |
1080 | ret = -EINVAL; | |
1081 | goto fail; | |
1082 | } | |
796d3239 MA |
1083 | qdict_put_str(encryptopts, "format", "luks"); |
1084 | r->crypto_opts = block_crypto_open_opts_init(encryptopts, errp); | |
4652b8f3 DB |
1085 | break; |
1086 | ||
b25b387f DB |
1087 | default: |
1088 | error_setg(errp, "Unsupported encryption method %d", | |
1089 | s->crypt_method_header); | |
1090 | break; | |
1091 | } | |
1092 | if (s->crypt_method_header != QCOW_CRYPT_NONE && !r->crypto_opts) { | |
1093 | ret = -EINVAL; | |
1094 | goto fail; | |
1095 | } | |
1096 | ||
4c75d1a1 KW |
1097 | ret = 0; |
1098 | fail: | |
cb3e7f08 | 1099 | qobject_unref(encryptopts); |
94edf3fb KW |
1100 | qemu_opts_del(opts); |
1101 | opts = NULL; | |
ee55b173 KW |
1102 | return ret; |
1103 | } | |
1104 | ||
1105 | static void qcow2_update_options_commit(BlockDriverState *bs, | |
1106 | Qcow2ReopenState *r) | |
1107 | { | |
1108 | BDRVQcow2State *s = bs->opaque; | |
1109 | int i; | |
1110 | ||
5b0959a7 | 1111 | if (s->l2_table_cache) { |
e64d4072 | 1112 | qcow2_cache_destroy(s->l2_table_cache); |
5b0959a7 KW |
1113 | } |
1114 | if (s->refcount_block_cache) { | |
e64d4072 | 1115 | qcow2_cache_destroy(s->refcount_block_cache); |
5b0959a7 | 1116 | } |
ee55b173 KW |
1117 | s->l2_table_cache = r->l2_table_cache; |
1118 | s->refcount_block_cache = r->refcount_block_cache; | |
3c2e511a | 1119 | s->l2_slice_size = r->l2_slice_size; |
ee55b173 KW |
1120 | |
1121 | s->overlap_check = r->overlap_check; | |
1122 | s->use_lazy_refcounts = r->use_lazy_refcounts; | |
1123 | ||
1124 | for (i = 0; i < QCOW2_DISCARD_MAX; i++) { | |
1125 | s->discard_passthrough[i] = r->discard_passthrough[i]; | |
1126 | } | |
1127 | ||
5b0959a7 KW |
1128 | if (s->cache_clean_interval != r->cache_clean_interval) { |
1129 | cache_clean_timer_del(bs); | |
1130 | s->cache_clean_interval = r->cache_clean_interval; | |
1131 | cache_clean_timer_init(bs, bdrv_get_aio_context(bs)); | |
1132 | } | |
b25b387f DB |
1133 | |
1134 | qapi_free_QCryptoBlockOpenOptions(s->crypto_opts); | |
1135 | s->crypto_opts = r->crypto_opts; | |
ee55b173 KW |
1136 | } |
1137 | ||
1138 | static void qcow2_update_options_abort(BlockDriverState *bs, | |
1139 | Qcow2ReopenState *r) | |
1140 | { | |
1141 | if (r->l2_table_cache) { | |
e64d4072 | 1142 | qcow2_cache_destroy(r->l2_table_cache); |
ee55b173 KW |
1143 | } |
1144 | if (r->refcount_block_cache) { | |
e64d4072 | 1145 | qcow2_cache_destroy(r->refcount_block_cache); |
ee55b173 | 1146 | } |
b25b387f | 1147 | qapi_free_QCryptoBlockOpenOptions(r->crypto_opts); |
ee55b173 KW |
1148 | } |
1149 | ||
1150 | static int qcow2_update_options(BlockDriverState *bs, QDict *options, | |
1151 | int flags, Error **errp) | |
1152 | { | |
1153 | Qcow2ReopenState r = {}; | |
1154 | int ret; | |
1155 | ||
1156 | ret = qcow2_update_options_prepare(bs, &r, options, flags, errp); | |
1157 | if (ret >= 0) { | |
1158 | qcow2_update_options_commit(bs, &r); | |
1159 | } else { | |
1160 | qcow2_update_options_abort(bs, &r); | |
1161 | } | |
94edf3fb | 1162 | |
4c75d1a1 KW |
1163 | return ret; |
1164 | } | |
1165 | ||
1fafcd93 PB |
1166 | /* Called with s->lock held. */ |
1167 | static int coroutine_fn qcow2_do_open(BlockDriverState *bs, QDict *options, | |
1168 | int flags, Error **errp) | |
585f8587 | 1169 | { |
ff99129a | 1170 | BDRVQcow2State *s = bs->opaque; |
6d33e8e7 KW |
1171 | unsigned int len, i; |
1172 | int ret = 0; | |
585f8587 | 1173 | QCowHeader header; |
74c4510a | 1174 | Error *local_err = NULL; |
9b80ddf3 | 1175 | uint64_t ext_end; |
2cf7cfa1 | 1176 | uint64_t l1_vm_state_index; |
88ddffae | 1177 | bool update_header = false; |
585f8587 | 1178 | |
cf2ab8fc | 1179 | ret = bdrv_pread(bs->file, 0, &header, sizeof(header)); |
6d85a57e | 1180 | if (ret < 0) { |
3ef6c40a | 1181 | error_setg_errno(errp, -ret, "Could not read qcow2 header"); |
585f8587 | 1182 | goto fail; |
6d85a57e | 1183 | } |
3b698f52 PM |
1184 | header.magic = be32_to_cpu(header.magic); |
1185 | header.version = be32_to_cpu(header.version); | |
1186 | header.backing_file_offset = be64_to_cpu(header.backing_file_offset); | |
1187 | header.backing_file_size = be32_to_cpu(header.backing_file_size); | |
1188 | header.size = be64_to_cpu(header.size); | |
1189 | header.cluster_bits = be32_to_cpu(header.cluster_bits); | |
1190 | header.crypt_method = be32_to_cpu(header.crypt_method); | |
1191 | header.l1_table_offset = be64_to_cpu(header.l1_table_offset); | |
1192 | header.l1_size = be32_to_cpu(header.l1_size); | |
1193 | header.refcount_table_offset = be64_to_cpu(header.refcount_table_offset); | |
1194 | header.refcount_table_clusters = | |
1195 | be32_to_cpu(header.refcount_table_clusters); | |
1196 | header.snapshots_offset = be64_to_cpu(header.snapshots_offset); | |
1197 | header.nb_snapshots = be32_to_cpu(header.nb_snapshots); | |
3b46e624 | 1198 | |
e8cdcec1 | 1199 | if (header.magic != QCOW_MAGIC) { |
3ef6c40a | 1200 | error_setg(errp, "Image is not in qcow2 format"); |
76abe407 | 1201 | ret = -EINVAL; |
585f8587 | 1202 | goto fail; |
6d85a57e | 1203 | } |
6744cbab | 1204 | if (header.version < 2 || header.version > 3) { |
a55448b3 | 1205 | error_setg(errp, "Unsupported qcow2 version %" PRIu32, header.version); |
6744cbab KW |
1206 | ret = -ENOTSUP; |
1207 | goto fail; | |
1208 | } | |
1209 | ||
1210 | s->qcow_version = header.version; | |
1211 | ||
24342f2c KW |
1212 | /* Initialise cluster size */ |
1213 | if (header.cluster_bits < MIN_CLUSTER_BITS || | |
1214 | header.cluster_bits > MAX_CLUSTER_BITS) { | |
521b2b5d HR |
1215 | error_setg(errp, "Unsupported cluster size: 2^%" PRIu32, |
1216 | header.cluster_bits); | |
24342f2c KW |
1217 | ret = -EINVAL; |
1218 | goto fail; | |
1219 | } | |
1220 | ||
1221 | s->cluster_bits = header.cluster_bits; | |
1222 | s->cluster_size = 1 << s->cluster_bits; | |
a35f87f5 | 1223 | s->cluster_sectors = 1 << (s->cluster_bits - BDRV_SECTOR_BITS); |
24342f2c | 1224 | |
6744cbab KW |
1225 | /* Initialise version 3 header fields */ |
1226 | if (header.version == 2) { | |
1227 | header.incompatible_features = 0; | |
1228 | header.compatible_features = 0; | |
1229 | header.autoclear_features = 0; | |
1230 | header.refcount_order = 4; | |
1231 | header.header_length = 72; | |
1232 | } else { | |
3b698f52 PM |
1233 | header.incompatible_features = |
1234 | be64_to_cpu(header.incompatible_features); | |
1235 | header.compatible_features = be64_to_cpu(header.compatible_features); | |
1236 | header.autoclear_features = be64_to_cpu(header.autoclear_features); | |
1237 | header.refcount_order = be32_to_cpu(header.refcount_order); | |
1238 | header.header_length = be32_to_cpu(header.header_length); | |
24342f2c KW |
1239 | |
1240 | if (header.header_length < 104) { | |
1241 | error_setg(errp, "qcow2 header too short"); | |
1242 | ret = -EINVAL; | |
1243 | goto fail; | |
1244 | } | |
1245 | } | |
1246 | ||
1247 | if (header.header_length > s->cluster_size) { | |
1248 | error_setg(errp, "qcow2 header exceeds cluster size"); | |
1249 | ret = -EINVAL; | |
1250 | goto fail; | |
6744cbab KW |
1251 | } |
1252 | ||
1253 | if (header.header_length > sizeof(header)) { | |
1254 | s->unknown_header_fields_size = header.header_length - sizeof(header); | |
1255 | s->unknown_header_fields = g_malloc(s->unknown_header_fields_size); | |
cf2ab8fc | 1256 | ret = bdrv_pread(bs->file, sizeof(header), s->unknown_header_fields, |
6744cbab KW |
1257 | s->unknown_header_fields_size); |
1258 | if (ret < 0) { | |
3ef6c40a HR |
1259 | error_setg_errno(errp, -ret, "Could not read unknown qcow2 header " |
1260 | "fields"); | |
6744cbab KW |
1261 | goto fail; |
1262 | } | |
1263 | } | |
1264 | ||
a1b3955c KW |
1265 | if (header.backing_file_offset > s->cluster_size) { |
1266 | error_setg(errp, "Invalid backing file offset"); | |
1267 | ret = -EINVAL; | |
1268 | goto fail; | |
1269 | } | |
1270 | ||
cfcc4c62 KW |
1271 | if (header.backing_file_offset) { |
1272 | ext_end = header.backing_file_offset; | |
1273 | } else { | |
1274 | ext_end = 1 << header.cluster_bits; | |
1275 | } | |
1276 | ||
6744cbab KW |
1277 | /* Handle feature bits */ |
1278 | s->incompatible_features = header.incompatible_features; | |
1279 | s->compatible_features = header.compatible_features; | |
1280 | s->autoclear_features = header.autoclear_features; | |
1281 | ||
c61d0004 | 1282 | if (s->incompatible_features & ~QCOW2_INCOMPAT_MASK) { |
cfcc4c62 KW |
1283 | void *feature_table = NULL; |
1284 | qcow2_read_extensions(bs, header.header_length, ext_end, | |
88ddffae | 1285 | &feature_table, flags, NULL, NULL); |
a55448b3 | 1286 | report_unsupported_feature(errp, feature_table, |
c61d0004 SH |
1287 | s->incompatible_features & |
1288 | ~QCOW2_INCOMPAT_MASK); | |
6744cbab | 1289 | ret = -ENOTSUP; |
c5a33ee9 | 1290 | g_free(feature_table); |
6744cbab KW |
1291 | goto fail; |
1292 | } | |
1293 | ||
69c98726 HR |
1294 | if (s->incompatible_features & QCOW2_INCOMPAT_CORRUPT) { |
1295 | /* Corrupt images may not be written to unless they are being repaired | |
1296 | */ | |
1297 | if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_CHECK)) { | |
3ef6c40a HR |
1298 | error_setg(errp, "qcow2: Image is corrupt; cannot be opened " |
1299 | "read/write"); | |
69c98726 HR |
1300 | ret = -EACCES; |
1301 | goto fail; | |
1302 | } | |
1303 | } | |
1304 | ||
6744cbab | 1305 | /* Check support for various header values */ |
b72faf9f HR |
1306 | if (header.refcount_order > 6) { |
1307 | error_setg(errp, "Reference count entry width too large; may not " | |
1308 | "exceed 64 bits"); | |
1309 | ret = -EINVAL; | |
e8cdcec1 KW |
1310 | goto fail; |
1311 | } | |
b6481f37 | 1312 | s->refcount_order = header.refcount_order; |
346a53df HR |
1313 | s->refcount_bits = 1 << s->refcount_order; |
1314 | s->refcount_max = UINT64_C(1) << (s->refcount_bits - 1); | |
1315 | s->refcount_max += s->refcount_max - 1; | |
6744cbab | 1316 | |
585f8587 | 1317 | s->crypt_method_header = header.crypt_method; |
6d85a57e | 1318 | if (s->crypt_method_header) { |
e6ff69bf DB |
1319 | if (bdrv_uses_whitelist() && |
1320 | s->crypt_method_header == QCOW_CRYPT_AES) { | |
8c0dcbc4 DB |
1321 | error_setg(errp, |
1322 | "Use of AES-CBC encrypted qcow2 images is no longer " | |
1323 | "supported in system emulators"); | |
1324 | error_append_hint(errp, | |
1325 | "You can use 'qemu-img convert' to convert your " | |
1326 | "image to an alternative supported format, such " | |
1327 | "as unencrypted qcow2, or raw with the LUKS " | |
1328 | "format instead.\n"); | |
1329 | ret = -ENOSYS; | |
1330 | goto fail; | |
e6ff69bf DB |
1331 | } |
1332 | ||
4652b8f3 DB |
1333 | if (s->crypt_method_header == QCOW_CRYPT_AES) { |
1334 | s->crypt_physical_offset = false; | |
1335 | } else { | |
1336 | /* Assuming LUKS and any future crypt methods we | |
1337 | * add will all use physical offsets, due to the | |
1338 | * fact that the alternative is insecure... */ | |
1339 | s->crypt_physical_offset = true; | |
1340 | } | |
1341 | ||
54115412 | 1342 | bs->encrypted = true; |
6d85a57e | 1343 | } |
24342f2c | 1344 | |
585f8587 FB |
1345 | s->l2_bits = s->cluster_bits - 3; /* L2 is always one cluster */ |
1346 | s->l2_size = 1 << s->l2_bits; | |
1d13d654 HR |
1347 | /* 2^(s->refcount_order - 3) is the refcount width in bytes */ |
1348 | s->refcount_block_bits = s->cluster_bits - (s->refcount_order - 3); | |
1349 | s->refcount_block_size = 1 << s->refcount_block_bits; | |
bd016b91 | 1350 | bs->total_sectors = header.size / BDRV_SECTOR_SIZE; |
585f8587 FB |
1351 | s->csize_shift = (62 - (s->cluster_bits - 8)); |
1352 | s->csize_mask = (1 << (s->cluster_bits - 8)) - 1; | |
1353 | s->cluster_offset_mask = (1LL << s->csize_shift) - 1; | |
5dab2fad | 1354 | |
585f8587 | 1355 | s->refcount_table_offset = header.refcount_table_offset; |
5fafdf24 | 1356 | s->refcount_table_size = |
585f8587 FB |
1357 | header.refcount_table_clusters << (s->cluster_bits - 3); |
1358 | ||
951053a9 AG |
1359 | if (header.refcount_table_clusters == 0 && !(flags & BDRV_O_CHECK)) { |
1360 | error_setg(errp, "Image does not contain a reference count table"); | |
1361 | ret = -EINVAL; | |
1362 | goto fail; | |
1363 | } | |
1364 | ||
0cf0e598 AG |
1365 | ret = qcow2_validate_table(bs, s->refcount_table_offset, |
1366 | header.refcount_table_clusters, | |
1367 | s->cluster_size, QCOW_MAX_REFTABLE_SIZE, | |
1368 | "Reference count table", errp); | |
8c7de283 | 1369 | if (ret < 0) { |
8c7de283 KW |
1370 | goto fail; |
1371 | } | |
1372 | ||
0cf0e598 AG |
1373 | /* The total size in bytes of the snapshot table is checked in |
1374 | * qcow2_read_snapshots() because the size of each snapshot is | |
1375 | * variable and we don't know it yet. | |
1376 | * Here we only check the offset and number of snapshots. */ | |
1377 | ret = qcow2_validate_table(bs, header.snapshots_offset, | |
1378 | header.nb_snapshots, | |
1379 | sizeof(QCowSnapshotHeader), | |
1380 | sizeof(QCowSnapshotHeader) * QCOW_MAX_SNAPSHOTS, | |
1381 | "Snapshot table", errp); | |
ce48f2f4 | 1382 | if (ret < 0) { |
ce48f2f4 KW |
1383 | goto fail; |
1384 | } | |
1385 | ||
585f8587 | 1386 | /* read the level 1 table */ |
0cf0e598 AG |
1387 | ret = qcow2_validate_table(bs, header.l1_table_offset, |
1388 | header.l1_size, sizeof(uint64_t), | |
1389 | QCOW_MAX_L1_SIZE, "Active L1 table", errp); | |
1390 | if (ret < 0) { | |
2d51c32c KW |
1391 | goto fail; |
1392 | } | |
585f8587 | 1393 | s->l1_size = header.l1_size; |
0cf0e598 | 1394 | s->l1_table_offset = header.l1_table_offset; |
2cf7cfa1 KW |
1395 | |
1396 | l1_vm_state_index = size_to_l1(s, header.size); | |
1397 | if (l1_vm_state_index > INT_MAX) { | |
3ef6c40a | 1398 | error_setg(errp, "Image is too big"); |
2cf7cfa1 KW |
1399 | ret = -EFBIG; |
1400 | goto fail; | |
1401 | } | |
1402 | s->l1_vm_state_index = l1_vm_state_index; | |
1403 | ||
585f8587 FB |
1404 | /* the L1 table must contain at least enough entries to put |
1405 | header.size bytes */ | |
6d85a57e | 1406 | if (s->l1_size < s->l1_vm_state_index) { |
3ef6c40a | 1407 | error_setg(errp, "L1 table is too small"); |
6d85a57e | 1408 | ret = -EINVAL; |
585f8587 | 1409 | goto fail; |
6d85a57e | 1410 | } |
2d51c32c | 1411 | |
d191d12d | 1412 | if (s->l1_size > 0) { |
9a4f4c31 | 1413 | s->l1_table = qemu_try_blockalign(bs->file->bs, |
9e029689 | 1414 | ROUND_UP(s->l1_size * sizeof(uint64_t), 512)); |
de82815d KW |
1415 | if (s->l1_table == NULL) { |
1416 | error_setg(errp, "Could not allocate L1 table"); | |
1417 | ret = -ENOMEM; | |
1418 | goto fail; | |
1419 | } | |
cf2ab8fc | 1420 | ret = bdrv_pread(bs->file, s->l1_table_offset, s->l1_table, |
6d85a57e JS |
1421 | s->l1_size * sizeof(uint64_t)); |
1422 | if (ret < 0) { | |
3ef6c40a | 1423 | error_setg_errno(errp, -ret, "Could not read L1 table"); |
d191d12d | 1424 | goto fail; |
6d85a57e | 1425 | } |
d191d12d | 1426 | for(i = 0;i < s->l1_size; i++) { |
3b698f52 | 1427 | s->l1_table[i] = be64_to_cpu(s->l1_table[i]); |
d191d12d | 1428 | } |
585f8587 | 1429 | } |
29c1a730 | 1430 | |
94edf3fb KW |
1431 | /* Parse driver-specific options */ |
1432 | ret = qcow2_update_options(bs, options, flags, errp); | |
90efa0ea KW |
1433 | if (ret < 0) { |
1434 | goto fail; | |
1435 | } | |
1436 | ||
06d9260f | 1437 | s->flags = flags; |
3b46e624 | 1438 | |
6d85a57e JS |
1439 | ret = qcow2_refcount_init(bs); |
1440 | if (ret != 0) { | |
3ef6c40a | 1441 | error_setg_errno(errp, -ret, "Could not initialize refcount handling"); |
585f8587 | 1442 | goto fail; |
6d85a57e | 1443 | } |
585f8587 | 1444 | |
72cf2d4f | 1445 | QLIST_INIT(&s->cluster_allocs); |
0b919fae | 1446 | QTAILQ_INIT(&s->discards); |
f214978a | 1447 | |
9b80ddf3 | 1448 | /* read qcow2 extensions */ |
3ef6c40a | 1449 | if (qcow2_read_extensions(bs, header.header_length, ext_end, NULL, |
88ddffae | 1450 | flags, &update_header, &local_err)) { |
3ef6c40a | 1451 | error_propagate(errp, local_err); |
6d85a57e | 1452 | ret = -EINVAL; |
9b80ddf3 | 1453 | goto fail; |
6d85a57e | 1454 | } |
9b80ddf3 | 1455 | |
0e8c08be KW |
1456 | /* Open external data file */ |
1457 | s->data_file = bdrv_open_child(NULL, options, "data-file", bs, &child_file, | |
1458 | true, &local_err); | |
1459 | if (local_err) { | |
1460 | error_propagate(errp, local_err); | |
1461 | ret = -EINVAL; | |
1462 | goto fail; | |
1463 | } | |
1464 | ||
1465 | if (s->incompatible_features & QCOW2_INCOMPAT_DATA_FILE) { | |
1466 | if (!s->data_file) { | |
1467 | error_setg(errp, "'data-file' is required for this image"); | |
1468 | ret = -EINVAL; | |
1469 | goto fail; | |
1470 | } | |
1471 | } else { | |
1472 | if (s->data_file) { | |
1473 | error_setg(errp, "'data-file' can only be set for images with an " | |
1474 | "external data file"); | |
1475 | ret = -EINVAL; | |
1476 | goto fail; | |
1477 | } else { | |
1478 | s->data_file = bs->file; | |
1479 | } | |
1480 | } | |
93c24936 | 1481 | |
4652b8f3 DB |
1482 | /* qcow2_read_extension may have set up the crypto context |
1483 | * if the crypt method needs a header region, some methods | |
1484 | * don't need header extensions, so must check here | |
1485 | */ | |
1486 | if (s->crypt_method_header && !s->crypto) { | |
1487 | if (s->crypt_method_header == QCOW_CRYPT_AES) { | |
1488 | unsigned int cflags = 0; | |
1489 | if (flags & BDRV_O_NO_IO) { | |
1490 | cflags |= QCRYPTO_BLOCK_OPEN_NO_IO; | |
1491 | } | |
1cd9a787 | 1492 | s->crypto = qcrypto_block_open(s->crypto_opts, "encrypt.", |
c972fa12 | 1493 | NULL, NULL, cflags, 1, errp); |
4652b8f3 DB |
1494 | if (!s->crypto) { |
1495 | ret = -EINVAL; | |
1496 | goto fail; | |
1497 | } | |
1498 | } else if (!(flags & BDRV_O_NO_IO)) { | |
1499 | error_setg(errp, "Missing CRYPTO header for crypt method %d", | |
1500 | s->crypt_method_header); | |
b25b387f DB |
1501 | ret = -EINVAL; |
1502 | goto fail; | |
1503 | } | |
1504 | } | |
1505 | ||
585f8587 FB |
1506 | /* read the backing file name */ |
1507 | if (header.backing_file_offset != 0) { | |
1508 | len = header.backing_file_size; | |
9a29e18f | 1509 | if (len > MIN(1023, s->cluster_size - header.backing_file_offset) || |
e729fa6a | 1510 | len >= sizeof(bs->backing_file)) { |
6d33e8e7 KW |
1511 | error_setg(errp, "Backing file name too long"); |
1512 | ret = -EINVAL; | |
1513 | goto fail; | |
6d85a57e | 1514 | } |
cf2ab8fc | 1515 | ret = bdrv_pread(bs->file, header.backing_file_offset, |
998c2019 | 1516 | bs->auto_backing_file, len); |
6d85a57e | 1517 | if (ret < 0) { |
3ef6c40a | 1518 | error_setg_errno(errp, -ret, "Could not read backing file name"); |
585f8587 | 1519 | goto fail; |
6d85a57e | 1520 | } |
998c2019 HR |
1521 | bs->auto_backing_file[len] = '\0'; |
1522 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), | |
1523 | bs->auto_backing_file); | |
1524 | s->image_backing_file = g_strdup(bs->auto_backing_file); | |
585f8587 | 1525 | } |
42deb29f | 1526 | |
11b128f4 KW |
1527 | /* Internal snapshots */ |
1528 | s->snapshots_offset = header.snapshots_offset; | |
1529 | s->nb_snapshots = header.nb_snapshots; | |
1530 | ||
42deb29f KW |
1531 | ret = qcow2_read_snapshots(bs); |
1532 | if (ret < 0) { | |
3ef6c40a | 1533 | error_setg_errno(errp, -ret, "Could not read snapshots"); |
585f8587 | 1534 | goto fail; |
6d85a57e | 1535 | } |
585f8587 | 1536 | |
af7b708d | 1537 | /* Clear unknown autoclear feature bits */ |
88ddffae | 1538 | update_header |= s->autoclear_features & ~QCOW2_AUTOCLEAR_MASK; |
d1258dd0 VSO |
1539 | update_header = |
1540 | update_header && !bs->read_only && !(flags & BDRV_O_INACTIVE); | |
1541 | if (update_header) { | |
88ddffae | 1542 | s->autoclear_features &= QCOW2_AUTOCLEAR_MASK; |
d1258dd0 VSO |
1543 | } |
1544 | ||
9c98f145 VSO |
1545 | /* == Handle persistent dirty bitmaps == |
1546 | * | |
1547 | * We want load dirty bitmaps in three cases: | |
1548 | * | |
1549 | * 1. Normal open of the disk in active mode, not related to invalidation | |
1550 | * after migration. | |
1551 | * | |
1552 | * 2. Invalidation of the target vm after pre-copy phase of migration, if | |
1553 | * bitmaps are _not_ migrating through migration channel, i.e. | |
1554 | * 'dirty-bitmaps' capability is disabled. | |
1555 | * | |
1556 | * 3. Invalidation of source vm after failed or canceled migration. | |
1557 | * This is a very interesting case. There are two possible types of | |
1558 | * bitmaps: | |
1559 | * | |
1560 | * A. Stored on inactivation and removed. They should be loaded from the | |
1561 | * image. | |
1562 | * | |
1563 | * B. Not stored: not-persistent bitmaps and bitmaps, migrated through | |
1564 | * the migration channel (with dirty-bitmaps capability). | |
1565 | * | |
1566 | * On the other hand, there are two possible sub-cases: | |
1567 | * | |
1568 | * 3.1 disk was changed by somebody else while were inactive. In this | |
1569 | * case all in-RAM dirty bitmaps (both persistent and not) are | |
1570 | * definitely invalid. And we don't have any method to determine | |
1571 | * this. | |
1572 | * | |
1573 | * Simple and safe thing is to just drop all the bitmaps of type B on | |
1574 | * inactivation. But in this case we lose bitmaps in valid 4.2 case. | |
1575 | * | |
1576 | * On the other hand, resuming source vm, if disk was already changed | |
1577 | * is a bad thing anyway: not only bitmaps, the whole vm state is | |
1578 | * out of sync with disk. | |
1579 | * | |
1580 | * This means, that user or management tool, who for some reason | |
1581 | * decided to resume source vm, after disk was already changed by | |
1582 | * target vm, should at least drop all dirty bitmaps by hand. | |
1583 | * | |
1584 | * So, we can ignore this case for now, but TODO: "generation" | |
1585 | * extension for qcow2, to determine, that image was changed after | |
1586 | * last inactivation. And if it is changed, we will drop (or at least | |
1587 | * mark as 'invalid' all the bitmaps of type B, both persistent | |
1588 | * and not). | |
1589 | * | |
1590 | * 3.2 disk was _not_ changed while were inactive. Bitmaps may be saved | |
1591 | * to disk ('dirty-bitmaps' capability disabled), or not saved | |
1592 | * ('dirty-bitmaps' capability enabled), but we don't need to care | |
1593 | * of: let's load bitmaps as always: stored bitmaps will be loaded, | |
1594 | * and not stored has flag IN_USE=1 in the image and will be skipped | |
1595 | * on loading. | |
1596 | * | |
1597 | * One remaining possible case when we don't want load bitmaps: | |
1598 | * | |
1599 | * 4. Open disk in inactive mode in target vm (bitmaps are migrating or | |
1600 | * will be loaded on invalidation, no needs try loading them before) | |
1601 | */ | |
1602 | ||
1603 | if (!(bdrv_get_flags(bs) & BDRV_O_INACTIVE)) { | |
1604 | /* It's case 1, 2 or 3.2. Or 3.1 which is BUG in management layer. */ | |
1605 | bool header_updated = qcow2_load_dirty_bitmaps(bs, &local_err); | |
1606 | ||
1607 | update_header = update_header && !header_updated; | |
d1258dd0 VSO |
1608 | } |
1609 | if (local_err != NULL) { | |
1610 | error_propagate(errp, local_err); | |
1611 | ret = -EINVAL; | |
1612 | goto fail; | |
1613 | } | |
1614 | ||
1615 | if (update_header) { | |
af7b708d SH |
1616 | ret = qcow2_update_header(bs); |
1617 | if (ret < 0) { | |
3ef6c40a | 1618 | error_setg_errno(errp, -ret, "Could not update qcow2 header"); |
af7b708d SH |
1619 | goto fail; |
1620 | } | |
1621 | } | |
1622 | ||
e24d813b | 1623 | bs->supported_zero_flags = header.version >= 3 ? BDRV_REQ_MAY_UNMAP : 0; |
68d100e9 | 1624 | |
c61d0004 | 1625 | /* Repair image if dirty */ |
04c01a5c | 1626 | if (!(flags & (BDRV_O_CHECK | BDRV_O_INACTIVE)) && !bs->read_only && |
058f8f16 | 1627 | (s->incompatible_features & QCOW2_INCOMPAT_DIRTY)) { |
c61d0004 SH |
1628 | BdrvCheckResult result = {0}; |
1629 | ||
2fd61638 PB |
1630 | ret = qcow2_co_check_locked(bs, &result, |
1631 | BDRV_FIX_ERRORS | BDRV_FIX_LEAKS); | |
791fff50 HR |
1632 | if (ret < 0 || result.check_errors) { |
1633 | if (ret >= 0) { | |
1634 | ret = -EIO; | |
1635 | } | |
3ef6c40a | 1636 | error_setg_errno(errp, -ret, "Could not repair dirty image"); |
c61d0004 SH |
1637 | goto fail; |
1638 | } | |
1639 | } | |
1640 | ||
585f8587 | 1641 | #ifdef DEBUG_ALLOC |
6cbc3031 PH |
1642 | { |
1643 | BdrvCheckResult result = {0}; | |
b35278f7 | 1644 | qcow2_check_refcounts(bs, &result, 0); |
6cbc3031 | 1645 | } |
585f8587 | 1646 | #endif |
ceb029cd VSO |
1647 | |
1648 | qemu_co_queue_init(&s->compress_wait_queue); | |
1649 | ||
6d85a57e | 1650 | return ret; |
585f8587 FB |
1651 | |
1652 | fail: | |
0e8c08be KW |
1653 | if (has_data_file(bs)) { |
1654 | bdrv_unref_child(bs, s->data_file); | |
1655 | } | |
6744cbab | 1656 | g_free(s->unknown_header_fields); |
75bab85c | 1657 | cleanup_unknown_header_ext(bs); |
ed6ccf0f KW |
1658 | qcow2_free_snapshots(bs); |
1659 | qcow2_refcount_close(bs); | |
de82815d | 1660 | qemu_vfree(s->l1_table); |
cf93980e HR |
1661 | /* else pre-write overlap checks in cache_destroy may crash */ |
1662 | s->l1_table = NULL; | |
279621c0 | 1663 | cache_clean_timer_del(bs); |
29c1a730 | 1664 | if (s->l2_table_cache) { |
e64d4072 | 1665 | qcow2_cache_destroy(s->l2_table_cache); |
29c1a730 | 1666 | } |
c5a33ee9 | 1667 | if (s->refcount_block_cache) { |
e64d4072 | 1668 | qcow2_cache_destroy(s->refcount_block_cache); |
c5a33ee9 | 1669 | } |
b25b387f DB |
1670 | qcrypto_block_free(s->crypto); |
1671 | qapi_free_QCryptoBlockOpenOptions(s->crypto_opts); | |
6d85a57e | 1672 | return ret; |
585f8587 FB |
1673 | } |
1674 | ||
1fafcd93 PB |
1675 | typedef struct QCow2OpenCo { |
1676 | BlockDriverState *bs; | |
1677 | QDict *options; | |
1678 | int flags; | |
1679 | Error **errp; | |
1680 | int ret; | |
1681 | } QCow2OpenCo; | |
1682 | ||
1683 | static void coroutine_fn qcow2_open_entry(void *opaque) | |
1684 | { | |
1685 | QCow2OpenCo *qoc = opaque; | |
1686 | BDRVQcow2State *s = qoc->bs->opaque; | |
1687 | ||
1688 | qemu_co_mutex_lock(&s->lock); | |
1689 | qoc->ret = qcow2_do_open(qoc->bs, qoc->options, qoc->flags, qoc->errp); | |
1690 | qemu_co_mutex_unlock(&s->lock); | |
1691 | } | |
1692 | ||
4e4bf5c4 KW |
1693 | static int qcow2_open(BlockDriverState *bs, QDict *options, int flags, |
1694 | Error **errp) | |
1695 | { | |
1fafcd93 PB |
1696 | BDRVQcow2State *s = bs->opaque; |
1697 | QCow2OpenCo qoc = { | |
1698 | .bs = bs, | |
1699 | .options = options, | |
1700 | .flags = flags, | |
1701 | .errp = errp, | |
1702 | .ret = -EINPROGRESS | |
1703 | }; | |
1704 | ||
4e4bf5c4 KW |
1705 | bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file, |
1706 | false, errp); | |
1707 | if (!bs->file) { | |
1708 | return -EINVAL; | |
1709 | } | |
1710 | ||
1fafcd93 PB |
1711 | /* Initialise locks */ |
1712 | qemu_co_mutex_init(&s->lock); | |
1713 | ||
1714 | if (qemu_in_coroutine()) { | |
1715 | /* From bdrv_co_create. */ | |
1716 | qcow2_open_entry(&qoc); | |
1717 | } else { | |
4720cbee | 1718 | assert(qemu_get_current_aio_context() == qemu_get_aio_context()); |
1fafcd93 PB |
1719 | qemu_coroutine_enter(qemu_coroutine_create(qcow2_open_entry, &qoc)); |
1720 | BDRV_POLL_WHILE(bs, qoc.ret == -EINPROGRESS); | |
1721 | } | |
1722 | return qoc.ret; | |
4e4bf5c4 KW |
1723 | } |
1724 | ||
3baca891 | 1725 | static void qcow2_refresh_limits(BlockDriverState *bs, Error **errp) |
d34682cd | 1726 | { |
ff99129a | 1727 | BDRVQcow2State *s = bs->opaque; |
d34682cd | 1728 | |
a84178cc EB |
1729 | if (bs->encrypted) { |
1730 | /* Encryption works on a sector granularity */ | |
6f8f015c | 1731 | bs->bl.request_alignment = qcrypto_block_get_sector_size(s->crypto); |
a84178cc | 1732 | } |
cf081fca | 1733 | bs->bl.pwrite_zeroes_alignment = s->cluster_size; |
ecdbead6 | 1734 | bs->bl.pdiscard_alignment = s->cluster_size; |
d34682cd KW |
1735 | } |
1736 | ||
21d82ac9 JC |
1737 | static int qcow2_reopen_prepare(BDRVReopenState *state, |
1738 | BlockReopenQueue *queue, Error **errp) | |
1739 | { | |
5b0959a7 | 1740 | Qcow2ReopenState *r; |
4c2e5f8f KW |
1741 | int ret; |
1742 | ||
5b0959a7 KW |
1743 | r = g_new0(Qcow2ReopenState, 1); |
1744 | state->opaque = r; | |
1745 | ||
1746 | ret = qcow2_update_options_prepare(state->bs, r, state->options, | |
1747 | state->flags, errp); | |
1748 | if (ret < 0) { | |
1749 | goto fail; | |
1750 | } | |
1751 | ||
1752 | /* We need to write out any unwritten data if we reopen read-only. */ | |
4c2e5f8f | 1753 | if ((state->flags & BDRV_O_RDWR) == 0) { |
169b8793 VSO |
1754 | ret = qcow2_reopen_bitmaps_ro(state->bs, errp); |
1755 | if (ret < 0) { | |
1756 | goto fail; | |
1757 | } | |
1758 | ||
4c2e5f8f KW |
1759 | ret = bdrv_flush(state->bs); |
1760 | if (ret < 0) { | |
5b0959a7 | 1761 | goto fail; |
4c2e5f8f KW |
1762 | } |
1763 | ||
1764 | ret = qcow2_mark_clean(state->bs); | |
1765 | if (ret < 0) { | |
5b0959a7 | 1766 | goto fail; |
4c2e5f8f KW |
1767 | } |
1768 | } | |
1769 | ||
21d82ac9 | 1770 | return 0; |
5b0959a7 KW |
1771 | |
1772 | fail: | |
1773 | qcow2_update_options_abort(state->bs, r); | |
1774 | g_free(r); | |
1775 | return ret; | |
1776 | } | |
1777 | ||
1778 | static void qcow2_reopen_commit(BDRVReopenState *state) | |
1779 | { | |
1780 | qcow2_update_options_commit(state->bs, state->opaque); | |
1781 | g_free(state->opaque); | |
1782 | } | |
1783 | ||
1784 | static void qcow2_reopen_abort(BDRVReopenState *state) | |
1785 | { | |
1786 | qcow2_update_options_abort(state->bs, state->opaque); | |
1787 | g_free(state->opaque); | |
21d82ac9 JC |
1788 | } |
1789 | ||
5365f44d KW |
1790 | static void qcow2_join_options(QDict *options, QDict *old_options) |
1791 | { | |
1792 | bool has_new_overlap_template = | |
1793 | qdict_haskey(options, QCOW2_OPT_OVERLAP) || | |
1794 | qdict_haskey(options, QCOW2_OPT_OVERLAP_TEMPLATE); | |
1795 | bool has_new_total_cache_size = | |
1796 | qdict_haskey(options, QCOW2_OPT_CACHE_SIZE); | |
1797 | bool has_all_cache_options; | |
1798 | ||
1799 | /* New overlap template overrides all old overlap options */ | |
1800 | if (has_new_overlap_template) { | |
1801 | qdict_del(old_options, QCOW2_OPT_OVERLAP); | |
1802 | qdict_del(old_options, QCOW2_OPT_OVERLAP_TEMPLATE); | |
1803 | qdict_del(old_options, QCOW2_OPT_OVERLAP_MAIN_HEADER); | |
1804 | qdict_del(old_options, QCOW2_OPT_OVERLAP_ACTIVE_L1); | |
1805 | qdict_del(old_options, QCOW2_OPT_OVERLAP_ACTIVE_L2); | |
1806 | qdict_del(old_options, QCOW2_OPT_OVERLAP_REFCOUNT_TABLE); | |
1807 | qdict_del(old_options, QCOW2_OPT_OVERLAP_REFCOUNT_BLOCK); | |
1808 | qdict_del(old_options, QCOW2_OPT_OVERLAP_SNAPSHOT_TABLE); | |
1809 | qdict_del(old_options, QCOW2_OPT_OVERLAP_INACTIVE_L1); | |
1810 | qdict_del(old_options, QCOW2_OPT_OVERLAP_INACTIVE_L2); | |
1811 | } | |
1812 | ||
1813 | /* New total cache size overrides all old options */ | |
1814 | if (qdict_haskey(options, QCOW2_OPT_CACHE_SIZE)) { | |
1815 | qdict_del(old_options, QCOW2_OPT_L2_CACHE_SIZE); | |
1816 | qdict_del(old_options, QCOW2_OPT_REFCOUNT_CACHE_SIZE); | |
1817 | } | |
1818 | ||
1819 | qdict_join(options, old_options, false); | |
1820 | ||
1821 | /* | |
1822 | * If after merging all cache size options are set, an old total size is | |
1823 | * overwritten. Do keep all options, however, if all three are new. The | |
1824 | * resulting error message is what we want to happen. | |
1825 | */ | |
1826 | has_all_cache_options = | |
1827 | qdict_haskey(options, QCOW2_OPT_CACHE_SIZE) || | |
1828 | qdict_haskey(options, QCOW2_OPT_L2_CACHE_SIZE) || | |
1829 | qdict_haskey(options, QCOW2_OPT_REFCOUNT_CACHE_SIZE); | |
1830 | ||
1831 | if (has_all_cache_options && !has_new_total_cache_size) { | |
1832 | qdict_del(options, QCOW2_OPT_CACHE_SIZE); | |
1833 | } | |
1834 | } | |
1835 | ||
a320fb04 EB |
1836 | static int coroutine_fn qcow2_co_block_status(BlockDriverState *bs, |
1837 | bool want_zero, | |
1838 | int64_t offset, int64_t count, | |
1839 | int64_t *pnum, int64_t *map, | |
1840 | BlockDriverState **file) | |
585f8587 | 1841 | { |
ff99129a | 1842 | BDRVQcow2State *s = bs->opaque; |
585f8587 | 1843 | uint64_t cluster_offset; |
4bc74be9 | 1844 | int index_in_cluster, ret; |
ecfe1863 | 1845 | unsigned int bytes; |
a320fb04 | 1846 | int status = 0; |
585f8587 | 1847 | |
a320fb04 | 1848 | bytes = MIN(INT_MAX, count); |
f8a2e5e3 | 1849 | qemu_co_mutex_lock(&s->lock); |
a320fb04 | 1850 | ret = qcow2_get_cluster_offset(bs, offset, &bytes, &cluster_offset); |
f8a2e5e3 | 1851 | qemu_co_mutex_unlock(&s->lock); |
1c46efaa | 1852 | if (ret < 0) { |
d663640c | 1853 | return ret; |
1c46efaa | 1854 | } |
095a9c58 | 1855 | |
a320fb04 | 1856 | *pnum = bytes; |
ecfe1863 | 1857 | |
37be1403 | 1858 | if ((ret == QCOW2_CLUSTER_NORMAL || ret == QCOW2_CLUSTER_ZERO_ALLOC) && |
b25b387f | 1859 | !s->crypto) { |
a320fb04 EB |
1860 | index_in_cluster = offset & (s->cluster_size - 1); |
1861 | *map = cluster_offset | index_in_cluster; | |
37be1403 | 1862 | *file = s->data_file->bs; |
a320fb04 | 1863 | status |= BDRV_BLOCK_OFFSET_VALID; |
4bc74be9 | 1864 | } |
fdfab37d | 1865 | if (ret == QCOW2_CLUSTER_ZERO_PLAIN || ret == QCOW2_CLUSTER_ZERO_ALLOC) { |
4bc74be9 PB |
1866 | status |= BDRV_BLOCK_ZERO; |
1867 | } else if (ret != QCOW2_CLUSTER_UNALLOCATED) { | |
1868 | status |= BDRV_BLOCK_DATA; | |
1869 | } | |
1870 | return status; | |
585f8587 FB |
1871 | } |
1872 | ||
fd9fcd37 FZ |
1873 | static coroutine_fn int qcow2_handle_l2meta(BlockDriverState *bs, |
1874 | QCowL2Meta **pl2meta, | |
1875 | bool link_l2) | |
1876 | { | |
1877 | int ret = 0; | |
1878 | QCowL2Meta *l2meta = *pl2meta; | |
1879 | ||
1880 | while (l2meta != NULL) { | |
1881 | QCowL2Meta *next; | |
1882 | ||
354d930d | 1883 | if (link_l2) { |
fd9fcd37 FZ |
1884 | ret = qcow2_alloc_cluster_link_l2(bs, l2meta); |
1885 | if (ret) { | |
1886 | goto out; | |
1887 | } | |
8b24cd14 KW |
1888 | } else { |
1889 | qcow2_alloc_cluster_abort(bs, l2meta); | |
fd9fcd37 FZ |
1890 | } |
1891 | ||
1892 | /* Take the request off the list of running requests */ | |
1893 | if (l2meta->nb_clusters != 0) { | |
1894 | QLIST_REMOVE(l2meta, next_in_flight); | |
1895 | } | |
1896 | ||
1897 | qemu_co_queue_restart_all(&l2meta->dependent_requests); | |
1898 | ||
1899 | next = l2meta->next; | |
1900 | g_free(l2meta); | |
1901 | l2meta = next; | |
1902 | } | |
1903 | out: | |
1904 | *pl2meta = l2meta; | |
1905 | return ret; | |
1906 | } | |
1907 | ||
ecfe1863 KW |
1908 | static coroutine_fn int qcow2_co_preadv(BlockDriverState *bs, uint64_t offset, |
1909 | uint64_t bytes, QEMUIOVector *qiov, | |
1910 | int flags) | |
585f8587 | 1911 | { |
ff99129a | 1912 | BDRVQcow2State *s = bs->opaque; |
546a7dc4 | 1913 | int offset_in_cluster; |
68d100e9 | 1914 | int ret; |
ecfe1863 | 1915 | unsigned int cur_bytes; /* number of bytes in current iteration */ |
c2bdd990 | 1916 | uint64_t cluster_offset = 0; |
3fc48d09 FZ |
1917 | uint64_t bytes_done = 0; |
1918 | QEMUIOVector hd_qiov; | |
1919 | uint8_t *cluster_data = NULL; | |
585f8587 | 1920 | |
3fc48d09 FZ |
1921 | qemu_iovec_init(&hd_qiov, qiov->niov); |
1922 | ||
1923 | qemu_co_mutex_lock(&s->lock); | |
1924 | ||
ecfe1863 | 1925 | while (bytes != 0) { |
bd28f835 | 1926 | |
5ebaa27e | 1927 | /* prepare next request */ |
ecfe1863 | 1928 | cur_bytes = MIN(bytes, INT_MAX); |
b25b387f | 1929 | if (s->crypto) { |
ecfe1863 KW |
1930 | cur_bytes = MIN(cur_bytes, |
1931 | QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size); | |
585f8587 | 1932 | } |
5ebaa27e | 1933 | |
ecfe1863 | 1934 | ret = qcow2_get_cluster_offset(bs, offset, &cur_bytes, &cluster_offset); |
8af36488 | 1935 | if (ret < 0) { |
3fc48d09 | 1936 | goto fail; |
8af36488 | 1937 | } |
bd28f835 | 1938 | |
ecfe1863 | 1939 | offset_in_cluster = offset_into_cluster(s, offset); |
c87c0672 | 1940 | |
3fc48d09 | 1941 | qemu_iovec_reset(&hd_qiov); |
ecfe1863 | 1942 | qemu_iovec_concat(&hd_qiov, qiov, bytes_done, cur_bytes); |
5ebaa27e | 1943 | |
68d000a3 KW |
1944 | switch (ret) { |
1945 | case QCOW2_CLUSTER_UNALLOCATED: | |
5ebaa27e | 1946 | |
760e0063 | 1947 | if (bs->backing) { |
546a7dc4 EK |
1948 | BLKDBG_EVENT(bs->file, BLKDBG_READ_BACKING_AIO); |
1949 | qemu_co_mutex_unlock(&s->lock); | |
1950 | ret = bdrv_co_preadv(bs->backing, offset, cur_bytes, | |
1951 | &hd_qiov, 0); | |
1952 | qemu_co_mutex_lock(&s->lock); | |
1953 | if (ret < 0) { | |
1954 | goto fail; | |
5ebaa27e FZ |
1955 | } |
1956 | } else { | |
1957 | /* Note: in this case, no need to wait */ | |
ecfe1863 | 1958 | qemu_iovec_memset(&hd_qiov, 0, 0, cur_bytes); |
5ebaa27e | 1959 | } |
68d000a3 KW |
1960 | break; |
1961 | ||
fdfab37d EB |
1962 | case QCOW2_CLUSTER_ZERO_PLAIN: |
1963 | case QCOW2_CLUSTER_ZERO_ALLOC: | |
ecfe1863 | 1964 | qemu_iovec_memset(&hd_qiov, 0, 0, cur_bytes); |
6377af48 KW |
1965 | break; |
1966 | ||
68d000a3 | 1967 | case QCOW2_CLUSTER_COMPRESSED: |
c3c10f72 VSO |
1968 | qemu_co_mutex_unlock(&s->lock); |
1969 | ret = qcow2_co_preadv_compressed(bs, cluster_offset, | |
1970 | offset, cur_bytes, | |
1971 | &hd_qiov); | |
1972 | qemu_co_mutex_lock(&s->lock); | |
5ebaa27e | 1973 | if (ret < 0) { |
3fc48d09 | 1974 | goto fail; |
bd28f835 KW |
1975 | } |
1976 | ||
68d000a3 KW |
1977 | break; |
1978 | ||
1979 | case QCOW2_CLUSTER_NORMAL: | |
5ebaa27e | 1980 | if ((cluster_offset & 511) != 0) { |
3fc48d09 FZ |
1981 | ret = -EIO; |
1982 | goto fail; | |
5ebaa27e | 1983 | } |
bd28f835 | 1984 | |
8336aafa | 1985 | if (bs->encrypted) { |
b25b387f | 1986 | assert(s->crypto); |
8336aafa | 1987 | |
5ebaa27e FZ |
1988 | /* |
1989 | * For encrypted images, read everything into a temporary | |
1990 | * contiguous buffer on which the AES functions can work. | |
1991 | */ | |
3fc48d09 FZ |
1992 | if (!cluster_data) { |
1993 | cluster_data = | |
966b000f | 1994 | qemu_try_blockalign(s->data_file->bs, |
9a4f4c31 KW |
1995 | QCOW_MAX_CRYPT_CLUSTERS |
1996 | * s->cluster_size); | |
de82815d KW |
1997 | if (cluster_data == NULL) { |
1998 | ret = -ENOMEM; | |
1999 | goto fail; | |
2000 | } | |
5ebaa27e FZ |
2001 | } |
2002 | ||
ecfe1863 | 2003 | assert(cur_bytes <= QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size); |
3fc48d09 | 2004 | qemu_iovec_reset(&hd_qiov); |
ecfe1863 | 2005 | qemu_iovec_add(&hd_qiov, cluster_data, cur_bytes); |
5ebaa27e FZ |
2006 | } |
2007 | ||
2008 | BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO); | |
2009 | qemu_co_mutex_unlock(&s->lock); | |
966b000f | 2010 | ret = bdrv_co_preadv(s->data_file, |
ecfe1863 KW |
2011 | cluster_offset + offset_in_cluster, |
2012 | cur_bytes, &hd_qiov, 0); | |
5ebaa27e FZ |
2013 | qemu_co_mutex_lock(&s->lock); |
2014 | if (ret < 0) { | |
3fc48d09 | 2015 | goto fail; |
5ebaa27e | 2016 | } |
8336aafa | 2017 | if (bs->encrypted) { |
b25b387f | 2018 | assert(s->crypto); |
ecfe1863 KW |
2019 | assert((offset & (BDRV_SECTOR_SIZE - 1)) == 0); |
2020 | assert((cur_bytes & (BDRV_SECTOR_SIZE - 1)) == 0); | |
b25b387f | 2021 | if (qcrypto_block_decrypt(s->crypto, |
4652b8f3 DB |
2022 | (s->crypt_physical_offset ? |
2023 | cluster_offset + offset_in_cluster : | |
4609742a | 2024 | offset), |
446d306d | 2025 | cluster_data, |
b25b387f | 2026 | cur_bytes, |
c3a8fe33 | 2027 | NULL) < 0) { |
f6fa64f6 DB |
2028 | ret = -EIO; |
2029 | goto fail; | |
2030 | } | |
ecfe1863 | 2031 | qemu_iovec_from_buf(qiov, bytes_done, cluster_data, cur_bytes); |
5ebaa27e | 2032 | } |
68d000a3 KW |
2033 | break; |
2034 | ||
2035 | default: | |
2036 | g_assert_not_reached(); | |
2037 | ret = -EIO; | |
2038 | goto fail; | |
faf575c1 | 2039 | } |
f141eafe | 2040 | |
ecfe1863 KW |
2041 | bytes -= cur_bytes; |
2042 | offset += cur_bytes; | |
2043 | bytes_done += cur_bytes; | |
5ebaa27e | 2044 | } |
3fc48d09 | 2045 | ret = 0; |
faf575c1 | 2046 | |
3fc48d09 | 2047 | fail: |
68d100e9 | 2048 | qemu_co_mutex_unlock(&s->lock); |
42496d62 | 2049 | |
3fc48d09 | 2050 | qemu_iovec_destroy(&hd_qiov); |
dea43a65 | 2051 | qemu_vfree(cluster_data); |
68d100e9 KW |
2052 | |
2053 | return ret; | |
585f8587 FB |
2054 | } |
2055 | ||
ee22a9d8 AG |
2056 | /* Check if it's possible to merge a write request with the writing of |
2057 | * the data from the COW regions */ | |
2058 | static bool merge_cow(uint64_t offset, unsigned bytes, | |
2059 | QEMUIOVector *hd_qiov, QCowL2Meta *l2meta) | |
2060 | { | |
2061 | QCowL2Meta *m; | |
2062 | ||
2063 | for (m = l2meta; m != NULL; m = m->next) { | |
2064 | /* If both COW regions are empty then there's nothing to merge */ | |
2065 | if (m->cow_start.nb_bytes == 0 && m->cow_end.nb_bytes == 0) { | |
2066 | continue; | |
2067 | } | |
2068 | ||
2069 | /* The data (middle) region must be immediately after the | |
2070 | * start region */ | |
2071 | if (l2meta_cow_start(m) + m->cow_start.nb_bytes != offset) { | |
2072 | continue; | |
2073 | } | |
2074 | ||
2075 | /* The end region must be immediately after the data (middle) | |
2076 | * region */ | |
2077 | if (m->offset + m->cow_end.offset != offset + bytes) { | |
2078 | continue; | |
2079 | } | |
2080 | ||
2081 | /* Make sure that adding both COW regions to the QEMUIOVector | |
2082 | * does not exceed IOV_MAX */ | |
2083 | if (hd_qiov->niov > IOV_MAX - 2) { | |
2084 | continue; | |
2085 | } | |
2086 | ||
2087 | m->data_qiov = hd_qiov; | |
2088 | return true; | |
2089 | } | |
2090 | ||
2091 | return false; | |
2092 | } | |
2093 | ||
d46a0bb2 KW |
2094 | static coroutine_fn int qcow2_co_pwritev(BlockDriverState *bs, uint64_t offset, |
2095 | uint64_t bytes, QEMUIOVector *qiov, | |
2096 | int flags) | |
585f8587 | 2097 | { |
ff99129a | 2098 | BDRVQcow2State *s = bs->opaque; |
d46a0bb2 | 2099 | int offset_in_cluster; |
68d100e9 | 2100 | int ret; |
d46a0bb2 | 2101 | unsigned int cur_bytes; /* number of sectors in current iteration */ |
c2bdd990 | 2102 | uint64_t cluster_offset; |
3fc48d09 FZ |
2103 | QEMUIOVector hd_qiov; |
2104 | uint64_t bytes_done = 0; | |
2105 | uint8_t *cluster_data = NULL; | |
8d2497c3 | 2106 | QCowL2Meta *l2meta = NULL; |
c2271403 | 2107 | |
d46a0bb2 | 2108 | trace_qcow2_writev_start_req(qemu_coroutine_self(), offset, bytes); |
3cce16f4 | 2109 | |
3fc48d09 FZ |
2110 | qemu_iovec_init(&hd_qiov, qiov->niov); |
2111 | ||
3fc48d09 FZ |
2112 | qemu_co_mutex_lock(&s->lock); |
2113 | ||
d46a0bb2 | 2114 | while (bytes != 0) { |
3fc48d09 | 2115 | |
f50f88b9 | 2116 | l2meta = NULL; |
cf5c1a23 | 2117 | |
3cce16f4 | 2118 | trace_qcow2_writev_start_part(qemu_coroutine_self()); |
d46a0bb2 KW |
2119 | offset_in_cluster = offset_into_cluster(s, offset); |
2120 | cur_bytes = MIN(bytes, INT_MAX); | |
2121 | if (bs->encrypted) { | |
2122 | cur_bytes = MIN(cur_bytes, | |
2123 | QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size | |
2124 | - offset_in_cluster); | |
5ebaa27e | 2125 | } |
095a9c58 | 2126 | |
d46a0bb2 KW |
2127 | ret = qcow2_alloc_cluster_offset(bs, offset, &cur_bytes, |
2128 | &cluster_offset, &l2meta); | |
5ebaa27e | 2129 | if (ret < 0) { |
3fc48d09 | 2130 | goto fail; |
5ebaa27e | 2131 | } |
148da7ea | 2132 | |
5ebaa27e | 2133 | assert((cluster_offset & 511) == 0); |
148da7ea | 2134 | |
3fc48d09 | 2135 | qemu_iovec_reset(&hd_qiov); |
d46a0bb2 | 2136 | qemu_iovec_concat(&hd_qiov, qiov, bytes_done, cur_bytes); |
6f5f060b | 2137 | |
8336aafa | 2138 | if (bs->encrypted) { |
b25b387f | 2139 | assert(s->crypto); |
3fc48d09 | 2140 | if (!cluster_data) { |
9a4f4c31 | 2141 | cluster_data = qemu_try_blockalign(bs->file->bs, |
de82815d KW |
2142 | QCOW_MAX_CRYPT_CLUSTERS |
2143 | * s->cluster_size); | |
2144 | if (cluster_data == NULL) { | |
2145 | ret = -ENOMEM; | |
2146 | goto fail; | |
2147 | } | |
5ebaa27e | 2148 | } |
6f5f060b | 2149 | |
3fc48d09 | 2150 | assert(hd_qiov.size <= |
5ebaa27e | 2151 | QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size); |
d5e6b161 | 2152 | qemu_iovec_to_buf(&hd_qiov, 0, cluster_data, hd_qiov.size); |
6f5f060b | 2153 | |
4652b8f3 DB |
2154 | if (qcrypto_block_encrypt(s->crypto, |
2155 | (s->crypt_physical_offset ? | |
2156 | cluster_offset + offset_in_cluster : | |
4609742a | 2157 | offset), |
446d306d | 2158 | cluster_data, |
c3a8fe33 | 2159 | cur_bytes, NULL) < 0) { |
f6fa64f6 DB |
2160 | ret = -EIO; |
2161 | goto fail; | |
2162 | } | |
6f5f060b | 2163 | |
3fc48d09 | 2164 | qemu_iovec_reset(&hd_qiov); |
d46a0bb2 | 2165 | qemu_iovec_add(&hd_qiov, cluster_data, cur_bytes); |
5ebaa27e | 2166 | } |
6f5f060b | 2167 | |
231bb267 | 2168 | ret = qcow2_pre_write_overlap_check(bs, 0, |
966b000f | 2169 | cluster_offset + offset_in_cluster, cur_bytes, true); |
cf93980e HR |
2170 | if (ret < 0) { |
2171 | goto fail; | |
2172 | } | |
2173 | ||
ee22a9d8 AG |
2174 | /* If we need to do COW, check if it's possible to merge the |
2175 | * writing of the guest data together with that of the COW regions. | |
2176 | * If it's not possible (or not necessary) then write the | |
2177 | * guest data now. */ | |
2178 | if (!merge_cow(offset, cur_bytes, &hd_qiov, l2meta)) { | |
2179 | qemu_co_mutex_unlock(&s->lock); | |
2180 | BLKDBG_EVENT(bs->file, BLKDBG_WRITE_AIO); | |
2181 | trace_qcow2_writev_data(qemu_coroutine_self(), | |
2182 | cluster_offset + offset_in_cluster); | |
966b000f | 2183 | ret = bdrv_co_pwritev(s->data_file, |
ee22a9d8 AG |
2184 | cluster_offset + offset_in_cluster, |
2185 | cur_bytes, &hd_qiov, 0); | |
2186 | qemu_co_mutex_lock(&s->lock); | |
2187 | if (ret < 0) { | |
2188 | goto fail; | |
2189 | } | |
5ebaa27e | 2190 | } |
f141eafe | 2191 | |
fd9fcd37 FZ |
2192 | ret = qcow2_handle_l2meta(bs, &l2meta, true); |
2193 | if (ret) { | |
2194 | goto fail; | |
f50f88b9 | 2195 | } |
0fa9131a | 2196 | |
d46a0bb2 KW |
2197 | bytes -= cur_bytes; |
2198 | offset += cur_bytes; | |
2199 | bytes_done += cur_bytes; | |
2200 | trace_qcow2_writev_done_part(qemu_coroutine_self(), cur_bytes); | |
5ebaa27e | 2201 | } |
3fc48d09 | 2202 | ret = 0; |
faf575c1 | 2203 | |
3fc48d09 | 2204 | fail: |
fd9fcd37 | 2205 | qcow2_handle_l2meta(bs, &l2meta, false); |
0fa9131a | 2206 | |
a8c57408 PB |
2207 | qemu_co_mutex_unlock(&s->lock); |
2208 | ||
3fc48d09 | 2209 | qemu_iovec_destroy(&hd_qiov); |
dea43a65 | 2210 | qemu_vfree(cluster_data); |
3cce16f4 | 2211 | trace_qcow2_writev_done_req(qemu_coroutine_self(), ret); |
42496d62 | 2212 | |
68d100e9 | 2213 | return ret; |
585f8587 FB |
2214 | } |
2215 | ||
ec6d8912 KW |
2216 | static int qcow2_inactivate(BlockDriverState *bs) |
2217 | { | |
2218 | BDRVQcow2State *s = bs->opaque; | |
2219 | int ret, result = 0; | |
5f72826e | 2220 | Error *local_err = NULL; |
ec6d8912 | 2221 | |
83a8c775 PB |
2222 | qcow2_store_persistent_dirty_bitmaps(bs, &local_err); |
2223 | if (local_err != NULL) { | |
2224 | result = -EINVAL; | |
132adb68 VSO |
2225 | error_reportf_err(local_err, "Lost persistent bitmaps during " |
2226 | "inactivation of node '%s': ", | |
2227 | bdrv_get_device_or_node_name(bs)); | |
83a8c775 PB |
2228 | } |
2229 | ||
ec6d8912 KW |
2230 | ret = qcow2_cache_flush(bs, s->l2_table_cache); |
2231 | if (ret) { | |
2232 | result = ret; | |
2233 | error_report("Failed to flush the L2 table cache: %s", | |
2234 | strerror(-ret)); | |
2235 | } | |
2236 | ||
2237 | ret = qcow2_cache_flush(bs, s->refcount_block_cache); | |
2238 | if (ret) { | |
2239 | result = ret; | |
2240 | error_report("Failed to flush the refcount block cache: %s", | |
2241 | strerror(-ret)); | |
2242 | } | |
2243 | ||
2244 | if (result == 0) { | |
2245 | qcow2_mark_clean(bs); | |
2246 | } | |
2247 | ||
2248 | return result; | |
2249 | } | |
2250 | ||
7c80ab3f | 2251 | static void qcow2_close(BlockDriverState *bs) |
585f8587 | 2252 | { |
ff99129a | 2253 | BDRVQcow2State *s = bs->opaque; |
de82815d | 2254 | qemu_vfree(s->l1_table); |
cf93980e HR |
2255 | /* else pre-write overlap checks in cache_destroy may crash */ |
2256 | s->l1_table = NULL; | |
29c1a730 | 2257 | |
140fd5a6 | 2258 | if (!(s->flags & BDRV_O_INACTIVE)) { |
ec6d8912 | 2259 | qcow2_inactivate(bs); |
27eb6c09 | 2260 | } |
c61d0004 | 2261 | |
279621c0 | 2262 | cache_clean_timer_del(bs); |
e64d4072 AG |
2263 | qcow2_cache_destroy(s->l2_table_cache); |
2264 | qcow2_cache_destroy(s->refcount_block_cache); | |
29c1a730 | 2265 | |
b25b387f DB |
2266 | qcrypto_block_free(s->crypto); |
2267 | s->crypto = NULL; | |
f6fa64f6 | 2268 | |
6744cbab | 2269 | g_free(s->unknown_header_fields); |
75bab85c | 2270 | cleanup_unknown_header_ext(bs); |
6744cbab | 2271 | |
e4603fe1 KW |
2272 | g_free(s->image_backing_file); |
2273 | g_free(s->image_backing_format); | |
2274 | ||
0e8c08be KW |
2275 | if (has_data_file(bs)) { |
2276 | bdrv_unref_child(bs, s->data_file); | |
2277 | } | |
2278 | ||
ed6ccf0f | 2279 | qcow2_refcount_close(bs); |
28c1202b | 2280 | qcow2_free_snapshots(bs); |
585f8587 FB |
2281 | } |
2282 | ||
2b148f39 PB |
2283 | static void coroutine_fn qcow2_co_invalidate_cache(BlockDriverState *bs, |
2284 | Error **errp) | |
06d9260f | 2285 | { |
ff99129a | 2286 | BDRVQcow2State *s = bs->opaque; |
06d9260f | 2287 | int flags = s->flags; |
b25b387f | 2288 | QCryptoBlock *crypto = NULL; |
acdfb480 | 2289 | QDict *options; |
5a8a30db KW |
2290 | Error *local_err = NULL; |
2291 | int ret; | |
06d9260f AL |
2292 | |
2293 | /* | |
2294 | * Backing files are read-only which makes all of their metadata immutable, | |
2295 | * that means we don't have to worry about reopening them here. | |
2296 | */ | |
2297 | ||
b25b387f DB |
2298 | crypto = s->crypto; |
2299 | s->crypto = NULL; | |
06d9260f AL |
2300 | |
2301 | qcow2_close(bs); | |
2302 | ||
ff99129a | 2303 | memset(s, 0, sizeof(BDRVQcow2State)); |
d475e5ac | 2304 | options = qdict_clone_shallow(bs->options); |
5a8a30db | 2305 | |
140fd5a6 | 2306 | flags &= ~BDRV_O_INACTIVE; |
2b148f39 | 2307 | qemu_co_mutex_lock(&s->lock); |
4e4bf5c4 | 2308 | ret = qcow2_do_open(bs, options, flags, &local_err); |
2b148f39 | 2309 | qemu_co_mutex_unlock(&s->lock); |
cb3e7f08 | 2310 | qobject_unref(options); |
5a8a30db | 2311 | if (local_err) { |
4b576648 MA |
2312 | error_propagate_prepend(errp, local_err, |
2313 | "Could not reopen qcow2 layer: "); | |
191fb11b | 2314 | bs->drv = NULL; |
5a8a30db KW |
2315 | return; |
2316 | } else if (ret < 0) { | |
2317 | error_setg_errno(errp, -ret, "Could not reopen qcow2 layer"); | |
191fb11b | 2318 | bs->drv = NULL; |
5a8a30db KW |
2319 | return; |
2320 | } | |
acdfb480 | 2321 | |
b25b387f | 2322 | s->crypto = crypto; |
06d9260f AL |
2323 | } |
2324 | ||
e24e49e6 KW |
2325 | static size_t header_ext_add(char *buf, uint32_t magic, const void *s, |
2326 | size_t len, size_t buflen) | |
2327 | { | |
2328 | QCowExtension *ext_backing_fmt = (QCowExtension*) buf; | |
2329 | size_t ext_len = sizeof(QCowExtension) + ((len + 7) & ~7); | |
2330 | ||
2331 | if (buflen < ext_len) { | |
2332 | return -ENOSPC; | |
2333 | } | |
2334 | ||
2335 | *ext_backing_fmt = (QCowExtension) { | |
2336 | .magic = cpu_to_be32(magic), | |
2337 | .len = cpu_to_be32(len), | |
2338 | }; | |
0647d47c SH |
2339 | |
2340 | if (len) { | |
2341 | memcpy(buf + sizeof(QCowExtension), s, len); | |
2342 | } | |
e24e49e6 KW |
2343 | |
2344 | return ext_len; | |
2345 | } | |
2346 | ||
756e6736 | 2347 | /* |
e24e49e6 KW |
2348 | * Updates the qcow2 header, including the variable length parts of it, i.e. |
2349 | * the backing file name and all extensions. qcow2 was not designed to allow | |
2350 | * such changes, so if we run out of space (we can only use the first cluster) | |
2351 | * this function may fail. | |
756e6736 KW |
2352 | * |
2353 | * Returns 0 on success, -errno in error cases. | |
2354 | */ | |
e24e49e6 | 2355 | int qcow2_update_header(BlockDriverState *bs) |
756e6736 | 2356 | { |
ff99129a | 2357 | BDRVQcow2State *s = bs->opaque; |
e24e49e6 KW |
2358 | QCowHeader *header; |
2359 | char *buf; | |
2360 | size_t buflen = s->cluster_size; | |
756e6736 | 2361 | int ret; |
e24e49e6 KW |
2362 | uint64_t total_size; |
2363 | uint32_t refcount_table_clusters; | |
6744cbab | 2364 | size_t header_length; |
75bab85c | 2365 | Qcow2UnknownHeaderExtension *uext; |
756e6736 | 2366 | |
e24e49e6 | 2367 | buf = qemu_blockalign(bs, buflen); |
756e6736 | 2368 | |
e24e49e6 KW |
2369 | /* Header structure */ |
2370 | header = (QCowHeader*) buf; | |
756e6736 | 2371 | |
e24e49e6 KW |
2372 | if (buflen < sizeof(*header)) { |
2373 | ret = -ENOSPC; | |
2374 | goto fail; | |
756e6736 KW |
2375 | } |
2376 | ||
6744cbab | 2377 | header_length = sizeof(*header) + s->unknown_header_fields_size; |
e24e49e6 KW |
2378 | total_size = bs->total_sectors * BDRV_SECTOR_SIZE; |
2379 | refcount_table_clusters = s->refcount_table_size >> (s->cluster_bits - 3); | |
2380 | ||
2381 | *header = (QCowHeader) { | |
6744cbab | 2382 | /* Version 2 fields */ |
e24e49e6 | 2383 | .magic = cpu_to_be32(QCOW_MAGIC), |
6744cbab | 2384 | .version = cpu_to_be32(s->qcow_version), |
e24e49e6 KW |
2385 | .backing_file_offset = 0, |
2386 | .backing_file_size = 0, | |
2387 | .cluster_bits = cpu_to_be32(s->cluster_bits), | |
2388 | .size = cpu_to_be64(total_size), | |
2389 | .crypt_method = cpu_to_be32(s->crypt_method_header), | |
2390 | .l1_size = cpu_to_be32(s->l1_size), | |
2391 | .l1_table_offset = cpu_to_be64(s->l1_table_offset), | |
2392 | .refcount_table_offset = cpu_to_be64(s->refcount_table_offset), | |
2393 | .refcount_table_clusters = cpu_to_be32(refcount_table_clusters), | |
2394 | .nb_snapshots = cpu_to_be32(s->nb_snapshots), | |
2395 | .snapshots_offset = cpu_to_be64(s->snapshots_offset), | |
6744cbab KW |
2396 | |
2397 | /* Version 3 fields */ | |
2398 | .incompatible_features = cpu_to_be64(s->incompatible_features), | |
2399 | .compatible_features = cpu_to_be64(s->compatible_features), | |
2400 | .autoclear_features = cpu_to_be64(s->autoclear_features), | |
b6481f37 | 2401 | .refcount_order = cpu_to_be32(s->refcount_order), |
6744cbab | 2402 | .header_length = cpu_to_be32(header_length), |
e24e49e6 | 2403 | }; |
756e6736 | 2404 | |
6744cbab KW |
2405 | /* For older versions, write a shorter header */ |
2406 | switch (s->qcow_version) { | |
2407 | case 2: | |
2408 | ret = offsetof(QCowHeader, incompatible_features); | |
2409 | break; | |
2410 | case 3: | |
2411 | ret = sizeof(*header); | |
2412 | break; | |
2413 | default: | |
b6c14762 JM |
2414 | ret = -EINVAL; |
2415 | goto fail; | |
6744cbab KW |
2416 | } |
2417 | ||
2418 | buf += ret; | |
2419 | buflen -= ret; | |
2420 | memset(buf, 0, buflen); | |
2421 | ||
2422 | /* Preserve any unknown field in the header */ | |
2423 | if (s->unknown_header_fields_size) { | |
2424 | if (buflen < s->unknown_header_fields_size) { | |
2425 | ret = -ENOSPC; | |
2426 | goto fail; | |
2427 | } | |
2428 | ||
2429 | memcpy(buf, s->unknown_header_fields, s->unknown_header_fields_size); | |
2430 | buf += s->unknown_header_fields_size; | |
2431 | buflen -= s->unknown_header_fields_size; | |
2432 | } | |
756e6736 | 2433 | |
e24e49e6 | 2434 | /* Backing file format header extension */ |
e4603fe1 | 2435 | if (s->image_backing_format) { |
e24e49e6 | 2436 | ret = header_ext_add(buf, QCOW2_EXT_MAGIC_BACKING_FORMAT, |
e4603fe1 KW |
2437 | s->image_backing_format, |
2438 | strlen(s->image_backing_format), | |
e24e49e6 KW |
2439 | buflen); |
2440 | if (ret < 0) { | |
2441 | goto fail; | |
756e6736 KW |
2442 | } |
2443 | ||
e24e49e6 KW |
2444 | buf += ret; |
2445 | buflen -= ret; | |
756e6736 KW |
2446 | } |
2447 | ||
4652b8f3 DB |
2448 | /* Full disk encryption header pointer extension */ |
2449 | if (s->crypto_header.offset != 0) { | |
3b698f52 PM |
2450 | s->crypto_header.offset = cpu_to_be64(s->crypto_header.offset); |
2451 | s->crypto_header.length = cpu_to_be64(s->crypto_header.length); | |
4652b8f3 DB |
2452 | ret = header_ext_add(buf, QCOW2_EXT_MAGIC_CRYPTO_HEADER, |
2453 | &s->crypto_header, sizeof(s->crypto_header), | |
2454 | buflen); | |
3b698f52 PM |
2455 | s->crypto_header.offset = be64_to_cpu(s->crypto_header.offset); |
2456 | s->crypto_header.length = be64_to_cpu(s->crypto_header.length); | |
4652b8f3 DB |
2457 | if (ret < 0) { |
2458 | goto fail; | |
2459 | } | |
2460 | buf += ret; | |
2461 | buflen -= ret; | |
2462 | } | |
2463 | ||
cfcc4c62 | 2464 | /* Feature table */ |
1a4828c7 KW |
2465 | if (s->qcow_version >= 3) { |
2466 | Qcow2Feature features[] = { | |
2467 | { | |
2468 | .type = QCOW2_FEAT_TYPE_INCOMPATIBLE, | |
2469 | .bit = QCOW2_INCOMPAT_DIRTY_BITNR, | |
2470 | .name = "dirty bit", | |
2471 | }, | |
2472 | { | |
2473 | .type = QCOW2_FEAT_TYPE_INCOMPATIBLE, | |
2474 | .bit = QCOW2_INCOMPAT_CORRUPT_BITNR, | |
2475 | .name = "corrupt bit", | |
2476 | }, | |
93c24936 KW |
2477 | { |
2478 | .type = QCOW2_FEAT_TYPE_INCOMPATIBLE, | |
2479 | .bit = QCOW2_INCOMPAT_DATA_FILE_BITNR, | |
2480 | .name = "external data file", | |
2481 | }, | |
1a4828c7 KW |
2482 | { |
2483 | .type = QCOW2_FEAT_TYPE_COMPATIBLE, | |
2484 | .bit = QCOW2_COMPAT_LAZY_REFCOUNTS_BITNR, | |
2485 | .name = "lazy refcounts", | |
2486 | }, | |
2487 | }; | |
2488 | ||
2489 | ret = header_ext_add(buf, QCOW2_EXT_MAGIC_FEATURE_TABLE, | |
2490 | features, sizeof(features), buflen); | |
2491 | if (ret < 0) { | |
2492 | goto fail; | |
2493 | } | |
2494 | buf += ret; | |
2495 | buflen -= ret; | |
cfcc4c62 | 2496 | } |
cfcc4c62 | 2497 | |
88ddffae VSO |
2498 | /* Bitmap extension */ |
2499 | if (s->nb_bitmaps > 0) { | |
2500 | Qcow2BitmapHeaderExt bitmaps_header = { | |
2501 | .nb_bitmaps = cpu_to_be32(s->nb_bitmaps), | |
2502 | .bitmap_directory_size = | |
2503 | cpu_to_be64(s->bitmap_directory_size), | |
2504 | .bitmap_directory_offset = | |
2505 | cpu_to_be64(s->bitmap_directory_offset) | |
2506 | }; | |
2507 | ret = header_ext_add(buf, QCOW2_EXT_MAGIC_BITMAPS, | |
2508 | &bitmaps_header, sizeof(bitmaps_header), | |
2509 | buflen); | |
2510 | if (ret < 0) { | |
2511 | goto fail; | |
2512 | } | |
2513 | buf += ret; | |
2514 | buflen -= ret; | |
2515 | } | |
2516 | ||
75bab85c KW |
2517 | /* Keep unknown header extensions */ |
2518 | QLIST_FOREACH(uext, &s->unknown_header_ext, next) { | |
2519 | ret = header_ext_add(buf, uext->magic, uext->data, uext->len, buflen); | |
2520 | if (ret < 0) { | |
2521 | goto fail; | |
2522 | } | |
2523 | ||
2524 | buf += ret; | |
2525 | buflen -= ret; | |
2526 | } | |
2527 | ||
e24e49e6 KW |
2528 | /* End of header extensions */ |
2529 | ret = header_ext_add(buf, QCOW2_EXT_MAGIC_END, NULL, 0, buflen); | |
756e6736 KW |
2530 | if (ret < 0) { |
2531 | goto fail; | |
2532 | } | |
2533 | ||
e24e49e6 KW |
2534 | buf += ret; |
2535 | buflen -= ret; | |
756e6736 | 2536 | |
e24e49e6 | 2537 | /* Backing file name */ |
e4603fe1 KW |
2538 | if (s->image_backing_file) { |
2539 | size_t backing_file_len = strlen(s->image_backing_file); | |
e24e49e6 KW |
2540 | |
2541 | if (buflen < backing_file_len) { | |
2542 | ret = -ENOSPC; | |
2543 | goto fail; | |
2544 | } | |
2545 | ||
00ea1881 | 2546 | /* Using strncpy is ok here, since buf is not NUL-terminated. */ |
e4603fe1 | 2547 | strncpy(buf, s->image_backing_file, buflen); |
e24e49e6 KW |
2548 | |
2549 | header->backing_file_offset = cpu_to_be64(buf - ((char*) header)); | |
2550 | header->backing_file_size = cpu_to_be32(backing_file_len); | |
756e6736 KW |
2551 | } |
2552 | ||
e24e49e6 | 2553 | /* Write the new header */ |
d9ca2ea2 | 2554 | ret = bdrv_pwrite(bs->file, 0, header, s->cluster_size); |
756e6736 KW |
2555 | if (ret < 0) { |
2556 | goto fail; | |
2557 | } | |
2558 | ||
2559 | ret = 0; | |
2560 | fail: | |
e24e49e6 | 2561 | qemu_vfree(header); |
756e6736 KW |
2562 | return ret; |
2563 | } | |
2564 | ||
2565 | static int qcow2_change_backing_file(BlockDriverState *bs, | |
2566 | const char *backing_file, const char *backing_fmt) | |
2567 | { | |
ff99129a | 2568 | BDRVQcow2State *s = bs->opaque; |
e4603fe1 | 2569 | |
4e876bcf HR |
2570 | if (backing_file && strlen(backing_file) > 1023) { |
2571 | return -EINVAL; | |
2572 | } | |
2573 | ||
998c2019 HR |
2574 | pstrcpy(bs->auto_backing_file, sizeof(bs->auto_backing_file), |
2575 | backing_file ?: ""); | |
e24e49e6 KW |
2576 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: ""); |
2577 | pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: ""); | |
2578 | ||
e4603fe1 KW |
2579 | g_free(s->image_backing_file); |
2580 | g_free(s->image_backing_format); | |
2581 | ||
2582 | s->image_backing_file = backing_file ? g_strdup(bs->backing_file) : NULL; | |
2583 | s->image_backing_format = backing_fmt ? g_strdup(bs->backing_format) : NULL; | |
2584 | ||
e24e49e6 | 2585 | return qcow2_update_header(bs); |
756e6736 KW |
2586 | } |
2587 | ||
4652b8f3 DB |
2588 | static int qcow2_crypt_method_from_format(const char *encryptfmt) |
2589 | { | |
2590 | if (g_str_equal(encryptfmt, "luks")) { | |
2591 | return QCOW_CRYPT_LUKS; | |
2592 | } else if (g_str_equal(encryptfmt, "aes")) { | |
2593 | return QCOW_CRYPT_AES; | |
2594 | } else { | |
2595 | return -EINVAL; | |
2596 | } | |
2597 | } | |
b25b387f | 2598 | |
60900b7b KW |
2599 | static int qcow2_set_up_encryption(BlockDriverState *bs, |
2600 | QCryptoBlockCreateOptions *cryptoopts, | |
2601 | Error **errp) | |
2602 | { | |
2603 | BDRVQcow2State *s = bs->opaque; | |
2604 | QCryptoBlock *crypto = NULL; | |
2605 | int fmt, ret; | |
2606 | ||
2607 | switch (cryptoopts->format) { | |
2608 | case Q_CRYPTO_BLOCK_FORMAT_LUKS: | |
2609 | fmt = QCOW_CRYPT_LUKS; | |
2610 | break; | |
2611 | case Q_CRYPTO_BLOCK_FORMAT_QCOW: | |
2612 | fmt = QCOW_CRYPT_AES; | |
2613 | break; | |
2614 | default: | |
2615 | error_setg(errp, "Crypto format not supported in qcow2"); | |
2616 | return -EINVAL; | |
b25b387f | 2617 | } |
60900b7b | 2618 | |
4652b8f3 | 2619 | s->crypt_method_header = fmt; |
b25b387f | 2620 | |
1cd9a787 | 2621 | crypto = qcrypto_block_create(cryptoopts, "encrypt.", |
4652b8f3 DB |
2622 | qcow2_crypto_hdr_init_func, |
2623 | qcow2_crypto_hdr_write_func, | |
b25b387f DB |
2624 | bs, errp); |
2625 | if (!crypto) { | |
60900b7b | 2626 | return -EINVAL; |
b25b387f DB |
2627 | } |
2628 | ||
2629 | ret = qcow2_update_header(bs); | |
2630 | if (ret < 0) { | |
2631 | error_setg_errno(errp, -ret, "Could not write encryption header"); | |
2632 | goto out; | |
2633 | } | |
2634 | ||
60900b7b | 2635 | ret = 0; |
b25b387f | 2636 | out: |
b25b387f | 2637 | qcrypto_block_free(crypto); |
b25b387f DB |
2638 | return ret; |
2639 | } | |
2640 | ||
7bc45dc1 HR |
2641 | /** |
2642 | * Preallocates metadata structures for data clusters between @offset (in the | |
2643 | * guest disk) and @new_length (which is thus generally the new guest disk | |
2644 | * size). | |
2645 | * | |
2646 | * Returns: 0 on success, -errno on failure. | |
2647 | */ | |
47e86b86 KW |
2648 | static int coroutine_fn preallocate_co(BlockDriverState *bs, uint64_t offset, |
2649 | uint64_t new_length) | |
a35e1c17 | 2650 | { |
d46a0bb2 | 2651 | uint64_t bytes; |
060bee89 | 2652 | uint64_t host_offset = 0; |
d46a0bb2 | 2653 | unsigned int cur_bytes; |
148da7ea | 2654 | int ret; |
f50f88b9 | 2655 | QCowL2Meta *meta; |
a35e1c17 | 2656 | |
7bc45dc1 HR |
2657 | assert(offset <= new_length); |
2658 | bytes = new_length - offset; | |
a35e1c17 | 2659 | |
d46a0bb2 KW |
2660 | while (bytes) { |
2661 | cur_bytes = MIN(bytes, INT_MAX); | |
2662 | ret = qcow2_alloc_cluster_offset(bs, offset, &cur_bytes, | |
060bee89 | 2663 | &host_offset, &meta); |
148da7ea | 2664 | if (ret < 0) { |
47e86b86 | 2665 | return ret; |
a35e1c17 KW |
2666 | } |
2667 | ||
c792707f SH |
2668 | while (meta) { |
2669 | QCowL2Meta *next = meta->next; | |
2670 | ||
7c2bbf4a HT |
2671 | ret = qcow2_alloc_cluster_link_l2(bs, meta); |
2672 | if (ret < 0) { | |
2673 | qcow2_free_any_clusters(bs, meta->alloc_offset, | |
2674 | meta->nb_clusters, QCOW2_DISCARD_NEVER); | |
47e86b86 | 2675 | return ret; |
7c2bbf4a HT |
2676 | } |
2677 | ||
2678 | /* There are no dependent requests, but we need to remove our | |
2679 | * request from the list of in-flight requests */ | |
4e95314e | 2680 | QLIST_REMOVE(meta, next_in_flight); |
c792707f SH |
2681 | |
2682 | g_free(meta); | |
2683 | meta = next; | |
f50f88b9 | 2684 | } |
f214978a | 2685 | |
a35e1c17 KW |
2686 | /* TODO Preallocate data if requested */ |
2687 | ||
d46a0bb2 KW |
2688 | bytes -= cur_bytes; |
2689 | offset += cur_bytes; | |
a35e1c17 KW |
2690 | } |
2691 | ||
2692 | /* | |
2693 | * It is expected that the image file is large enough to actually contain | |
2694 | * all of the allocated clusters (otherwise we get failing reads after | |
2695 | * EOF). Extend the image to the last allocated sector. | |
2696 | */ | |
060bee89 | 2697 | if (host_offset != 0) { |
d46a0bb2 | 2698 | uint8_t data = 0; |
d9ca2ea2 | 2699 | ret = bdrv_pwrite(bs->file, (host_offset + cur_bytes) - 1, |
d46a0bb2 | 2700 | &data, 1); |
19dbcbf7 | 2701 | if (ret < 0) { |
47e86b86 | 2702 | return ret; |
19dbcbf7 | 2703 | } |
a35e1c17 KW |
2704 | } |
2705 | ||
47e86b86 | 2706 | return 0; |
a35e1c17 KW |
2707 | } |
2708 | ||
7c5bcc42 SH |
2709 | /* qcow2_refcount_metadata_size: |
2710 | * @clusters: number of clusters to refcount (including data and L1/L2 tables) | |
2711 | * @cluster_size: size of a cluster, in bytes | |
2712 | * @refcount_order: refcount bits power-of-2 exponent | |
12cc30a8 HR |
2713 | * @generous_increase: allow for the refcount table to be 1.5x as large as it |
2714 | * needs to be | |
7c5bcc42 SH |
2715 | * |
2716 | * Returns: Number of bytes required for refcount blocks and table metadata. | |
2717 | */ | |
12cc30a8 HR |
2718 | int64_t qcow2_refcount_metadata_size(int64_t clusters, size_t cluster_size, |
2719 | int refcount_order, bool generous_increase, | |
2720 | uint64_t *refblock_count) | |
7c5bcc42 SH |
2721 | { |
2722 | /* | |
2723 | * Every host cluster is reference-counted, including metadata (even | |
2724 | * refcount metadata is recursively included). | |
2725 | * | |
2726 | * An accurate formula for the size of refcount metadata size is difficult | |
2727 | * to derive. An easier method of calculation is finding the fixed point | |
2728 | * where no further refcount blocks or table clusters are required to | |
2729 | * reference count every cluster. | |
2730 | */ | |
2731 | int64_t blocks_per_table_cluster = cluster_size / sizeof(uint64_t); | |
2732 | int64_t refcounts_per_block = cluster_size * 8 / (1 << refcount_order); | |
2733 | int64_t table = 0; /* number of refcount table clusters */ | |
2734 | int64_t blocks = 0; /* number of refcount block clusters */ | |
2735 | int64_t last; | |
2736 | int64_t n = 0; | |
2737 | ||
2738 | do { | |
2739 | last = n; | |
2740 | blocks = DIV_ROUND_UP(clusters + table + blocks, refcounts_per_block); | |
2741 | table = DIV_ROUND_UP(blocks, blocks_per_table_cluster); | |
2742 | n = clusters + blocks + table; | |
12cc30a8 HR |
2743 | |
2744 | if (n == last && generous_increase) { | |
2745 | clusters += DIV_ROUND_UP(table, 2); | |
2746 | n = 0; /* force another loop */ | |
2747 | generous_increase = false; | |
2748 | } | |
7c5bcc42 SH |
2749 | } while (n != last); |
2750 | ||
12cc30a8 HR |
2751 | if (refblock_count) { |
2752 | *refblock_count = blocks; | |
2753 | } | |
2754 | ||
7c5bcc42 SH |
2755 | return (blocks + table) * cluster_size; |
2756 | } | |
2757 | ||
95c67e3b SH |
2758 | /** |
2759 | * qcow2_calc_prealloc_size: | |
2760 | * @total_size: virtual disk size in bytes | |
2761 | * @cluster_size: cluster size in bytes | |
2762 | * @refcount_order: refcount bits power-of-2 exponent | |
2763 | * | |
2764 | * Returns: Total number of bytes required for the fully allocated image | |
2765 | * (including metadata). | |
2766 | */ | |
2767 | static int64_t qcow2_calc_prealloc_size(int64_t total_size, | |
2768 | size_t cluster_size, | |
2769 | int refcount_order) | |
2770 | { | |
95c67e3b | 2771 | int64_t meta_size = 0; |
7c5bcc42 | 2772 | uint64_t nl1e, nl2e; |
9e029689 | 2773 | int64_t aligned_total_size = ROUND_UP(total_size, cluster_size); |
95c67e3b SH |
2774 | |
2775 | /* header: 1 cluster */ | |
2776 | meta_size += cluster_size; | |
2777 | ||
2778 | /* total size of L2 tables */ | |
2779 | nl2e = aligned_total_size / cluster_size; | |
9e029689 | 2780 | nl2e = ROUND_UP(nl2e, cluster_size / sizeof(uint64_t)); |
95c67e3b SH |
2781 | meta_size += nl2e * sizeof(uint64_t); |
2782 | ||
2783 | /* total size of L1 tables */ | |
2784 | nl1e = nl2e * sizeof(uint64_t) / cluster_size; | |
9e029689 | 2785 | nl1e = ROUND_UP(nl1e, cluster_size / sizeof(uint64_t)); |
95c67e3b SH |
2786 | meta_size += nl1e * sizeof(uint64_t); |
2787 | ||
7c5bcc42 SH |
2788 | /* total size of refcount table and blocks */ |
2789 | meta_size += qcow2_refcount_metadata_size( | |
2790 | (meta_size + aligned_total_size) / cluster_size, | |
12cc30a8 | 2791 | cluster_size, refcount_order, false, NULL); |
95c67e3b SH |
2792 | |
2793 | return meta_size + aligned_total_size; | |
2794 | } | |
2795 | ||
29ca9e45 | 2796 | static bool validate_cluster_size(size_t cluster_size, Error **errp) |
a9420734 | 2797 | { |
29ca9e45 | 2798 | int cluster_bits = ctz32(cluster_size); |
a9420734 KW |
2799 | if (cluster_bits < MIN_CLUSTER_BITS || cluster_bits > MAX_CLUSTER_BITS || |
2800 | (1 << cluster_bits) != cluster_size) | |
2801 | { | |
3ef6c40a HR |
2802 | error_setg(errp, "Cluster size must be a power of two between %d and " |
2803 | "%dk", 1 << MIN_CLUSTER_BITS, 1 << (MAX_CLUSTER_BITS - 10)); | |
29ca9e45 KW |
2804 | return false; |
2805 | } | |
2806 | return true; | |
2807 | } | |
2808 | ||
2809 | static size_t qcow2_opt_get_cluster_size_del(QemuOpts *opts, Error **errp) | |
2810 | { | |
2811 | size_t cluster_size; | |
2812 | ||
2813 | cluster_size = qemu_opt_get_size_del(opts, BLOCK_OPT_CLUSTER_SIZE, | |
2814 | DEFAULT_CLUSTER_SIZE); | |
2815 | if (!validate_cluster_size(cluster_size, errp)) { | |
0eb4a8c1 SH |
2816 | return 0; |
2817 | } | |
2818 | return cluster_size; | |
2819 | } | |
2820 | ||
2821 | static int qcow2_opt_get_version_del(QemuOpts *opts, Error **errp) | |
2822 | { | |
2823 | char *buf; | |
2824 | int ret; | |
2825 | ||
2826 | buf = qemu_opt_get_del(opts, BLOCK_OPT_COMPAT_LEVEL); | |
2827 | if (!buf) { | |
2828 | ret = 3; /* default */ | |
2829 | } else if (!strcmp(buf, "0.10")) { | |
2830 | ret = 2; | |
2831 | } else if (!strcmp(buf, "1.1")) { | |
2832 | ret = 3; | |
2833 | } else { | |
2834 | error_setg(errp, "Invalid compatibility level: '%s'", buf); | |
2835 | ret = -EINVAL; | |
2836 | } | |
2837 | g_free(buf); | |
2838 | return ret; | |
2839 | } | |
2840 | ||
2841 | static uint64_t qcow2_opt_get_refcount_bits_del(QemuOpts *opts, int version, | |
2842 | Error **errp) | |
2843 | { | |
2844 | uint64_t refcount_bits; | |
2845 | ||
2846 | refcount_bits = qemu_opt_get_number_del(opts, BLOCK_OPT_REFCOUNT_BITS, 16); | |
2847 | if (refcount_bits > 64 || !is_power_of_2(refcount_bits)) { | |
2848 | error_setg(errp, "Refcount width must be a power of two and may not " | |
2849 | "exceed 64 bits"); | |
2850 | return 0; | |
2851 | } | |
2852 | ||
2853 | if (version < 3 && refcount_bits != 16) { | |
2854 | error_setg(errp, "Different refcount widths than 16 bits require " | |
2855 | "compatibility level 1.1 or above (use compat=1.1 or " | |
2856 | "greater)"); | |
2857 | return 0; | |
a9420734 KW |
2858 | } |
2859 | ||
0eb4a8c1 SH |
2860 | return refcount_bits; |
2861 | } | |
2862 | ||
c274393a | 2863 | static int coroutine_fn |
60900b7b | 2864 | qcow2_co_create(BlockdevCreateOptions *create_options, Error **errp) |
0eb4a8c1 | 2865 | { |
29ca9e45 | 2866 | BlockdevCreateOptionsQcow2 *qcow2_opts; |
0eb4a8c1 SH |
2867 | QDict *options; |
2868 | ||
a9420734 KW |
2869 | /* |
2870 | * Open the image file and write a minimal qcow2 header. | |
2871 | * | |
2872 | * We keep things simple and start with a zero-sized image. We also | |
2873 | * do without refcount blocks or a L1 table for now. We'll fix the | |
2874 | * inconsistency later. | |
2875 | * | |
2876 | * We do need a refcount table because growing the refcount table means | |
2877 | * allocating two new refcount blocks - the seconds of which would be at | |
2878 | * 2 GB for 64k clusters, and we don't want to have a 2 GB initial file | |
2879 | * size for any qcow2 image. | |
2880 | */ | |
e1d74bc6 KW |
2881 | BlockBackend *blk = NULL; |
2882 | BlockDriverState *bs = NULL; | |
dcc98687 | 2883 | BlockDriverState *data_bs = NULL; |
f8413b3c | 2884 | QCowHeader *header; |
29ca9e45 KW |
2885 | size_t cluster_size; |
2886 | int version; | |
2887 | int refcount_order; | |
b106ad91 | 2888 | uint64_t* refcount_table; |
3ef6c40a | 2889 | Error *local_err = NULL; |
a9420734 KW |
2890 | int ret; |
2891 | ||
29ca9e45 KW |
2892 | assert(create_options->driver == BLOCKDEV_DRIVER_QCOW2); |
2893 | qcow2_opts = &create_options->u.qcow2; | |
2894 | ||
e1d74bc6 KW |
2895 | bs = bdrv_open_blockdev_ref(qcow2_opts->file, errp); |
2896 | if (bs == NULL) { | |
2897 | return -EIO; | |
2898 | } | |
2899 | ||
2900 | /* Validate options and set default values */ | |
29ca9e45 KW |
2901 | if (!QEMU_IS_ALIGNED(qcow2_opts->size, BDRV_SECTOR_SIZE)) { |
2902 | error_setg(errp, "Image size must be a multiple of 512 bytes"); | |
2903 | ret = -EINVAL; | |
2904 | goto out; | |
2905 | } | |
2906 | ||
2907 | if (qcow2_opts->has_version) { | |
2908 | switch (qcow2_opts->version) { | |
2909 | case BLOCKDEV_QCOW2_VERSION_V2: | |
2910 | version = 2; | |
2911 | break; | |
2912 | case BLOCKDEV_QCOW2_VERSION_V3: | |
2913 | version = 3; | |
2914 | break; | |
2915 | default: | |
2916 | g_assert_not_reached(); | |
2917 | } | |
2918 | } else { | |
2919 | version = 3; | |
2920 | } | |
2921 | ||
2922 | if (qcow2_opts->has_cluster_size) { | |
2923 | cluster_size = qcow2_opts->cluster_size; | |
2924 | } else { | |
2925 | cluster_size = DEFAULT_CLUSTER_SIZE; | |
2926 | } | |
2927 | ||
2928 | if (!validate_cluster_size(cluster_size, errp)) { | |
e1d74bc6 KW |
2929 | ret = -EINVAL; |
2930 | goto out; | |
29ca9e45 KW |
2931 | } |
2932 | ||
2933 | if (!qcow2_opts->has_preallocation) { | |
2934 | qcow2_opts->preallocation = PREALLOC_MODE_OFF; | |
2935 | } | |
2936 | if (qcow2_opts->has_backing_file && | |
2937 | qcow2_opts->preallocation != PREALLOC_MODE_OFF) | |
2938 | { | |
2939 | error_setg(errp, "Backing file and preallocation cannot be used at " | |
2940 | "the same time"); | |
e1d74bc6 KW |
2941 | ret = -EINVAL; |
2942 | goto out; | |
29ca9e45 KW |
2943 | } |
2944 | if (qcow2_opts->has_backing_fmt && !qcow2_opts->has_backing_file) { | |
2945 | error_setg(errp, "Backing format cannot be used without backing file"); | |
e1d74bc6 KW |
2946 | ret = -EINVAL; |
2947 | goto out; | |
29ca9e45 KW |
2948 | } |
2949 | ||
2950 | if (!qcow2_opts->has_lazy_refcounts) { | |
2951 | qcow2_opts->lazy_refcounts = false; | |
2952 | } | |
2953 | if (version < 3 && qcow2_opts->lazy_refcounts) { | |
2954 | error_setg(errp, "Lazy refcounts only supported with compatibility " | |
b76b4f60 | 2955 | "level 1.1 and above (use version=v3 or greater)"); |
e1d74bc6 KW |
2956 | ret = -EINVAL; |
2957 | goto out; | |
29ca9e45 KW |
2958 | } |
2959 | ||
2960 | if (!qcow2_opts->has_refcount_bits) { | |
2961 | qcow2_opts->refcount_bits = 16; | |
2962 | } | |
2963 | if (qcow2_opts->refcount_bits > 64 || | |
2964 | !is_power_of_2(qcow2_opts->refcount_bits)) | |
2965 | { | |
2966 | error_setg(errp, "Refcount width must be a power of two and may not " | |
2967 | "exceed 64 bits"); | |
e1d74bc6 KW |
2968 | ret = -EINVAL; |
2969 | goto out; | |
29ca9e45 KW |
2970 | } |
2971 | if (version < 3 && qcow2_opts->refcount_bits != 16) { | |
2972 | error_setg(errp, "Different refcount widths than 16 bits require " | |
b76b4f60 | 2973 | "compatibility level 1.1 or above (use version=v3 or " |
29ca9e45 | 2974 | "greater)"); |
e1d74bc6 KW |
2975 | ret = -EINVAL; |
2976 | goto out; | |
29ca9e45 KW |
2977 | } |
2978 | refcount_order = ctz32(qcow2_opts->refcount_bits); | |
2979 | ||
dcc98687 KW |
2980 | if (qcow2_opts->data_file) { |
2981 | if (version < 3) { | |
2982 | error_setg(errp, "External data files are only supported with " | |
2983 | "compatibility level 1.1 and above (use version=v3 or " | |
2984 | "greater)"); | |
2985 | ret = -EINVAL; | |
2986 | goto out; | |
2987 | } | |
2988 | data_bs = bdrv_open_blockdev_ref(qcow2_opts->data_file, errp); | |
2989 | if (bs == NULL) { | |
2990 | ret = -EIO; | |
2991 | goto out; | |
2992 | } | |
2993 | } | |
29ca9e45 KW |
2994 | |
2995 | /* Create BlockBackend to write to the image */ | |
cbf2b7c4 KW |
2996 | blk = blk_new(BLK_PERM_WRITE | BLK_PERM_RESIZE, BLK_PERM_ALL); |
2997 | ret = blk_insert_bs(blk, bs, errp); | |
a9420734 | 2998 | if (ret < 0) { |
cbf2b7c4 | 2999 | goto out; |
a9420734 | 3000 | } |
23588797 KW |
3001 | blk_set_allow_write_beyond_eof(blk, true); |
3002 | ||
e4b5dad8 KW |
3003 | /* Clear the protocol layer and preallocate it if necessary */ |
3004 | ret = blk_truncate(blk, 0, PREALLOC_MODE_OFF, errp); | |
3005 | if (ret < 0) { | |
3006 | goto out; | |
3007 | } | |
3008 | ||
a9420734 | 3009 | /* Write the header */ |
f8413b3c KW |
3010 | QEMU_BUILD_BUG_ON((1 << MIN_CLUSTER_BITS) < sizeof(*header)); |
3011 | header = g_malloc0(cluster_size); | |
3012 | *header = (QCowHeader) { | |
3013 | .magic = cpu_to_be32(QCOW_MAGIC), | |
3014 | .version = cpu_to_be32(version), | |
0eb4a8c1 | 3015 | .cluster_bits = cpu_to_be32(ctz32(cluster_size)), |
f8413b3c KW |
3016 | .size = cpu_to_be64(0), |
3017 | .l1_table_offset = cpu_to_be64(0), | |
3018 | .l1_size = cpu_to_be32(0), | |
3019 | .refcount_table_offset = cpu_to_be64(cluster_size), | |
3020 | .refcount_table_clusters = cpu_to_be32(1), | |
bd4b167f | 3021 | .refcount_order = cpu_to_be32(refcount_order), |
f8413b3c KW |
3022 | .header_length = cpu_to_be32(sizeof(*header)), |
3023 | }; | |
a9420734 | 3024 | |
b25b387f DB |
3025 | /* We'll update this to correct value later */ |
3026 | header->crypt_method = cpu_to_be32(QCOW_CRYPT_NONE); | |
a9420734 | 3027 | |
29ca9e45 | 3028 | if (qcow2_opts->lazy_refcounts) { |
f8413b3c | 3029 | header->compatible_features |= |
bfe8043e SH |
3030 | cpu_to_be64(QCOW2_COMPAT_LAZY_REFCOUNTS); |
3031 | } | |
dcc98687 KW |
3032 | if (data_bs) { |
3033 | header->incompatible_features |= | |
3034 | cpu_to_be64(QCOW2_INCOMPAT_DATA_FILE); | |
3035 | } | |
bfe8043e | 3036 | |
8341f00d | 3037 | ret = blk_pwrite(blk, 0, header, cluster_size, 0); |
f8413b3c | 3038 | g_free(header); |
a9420734 | 3039 | if (ret < 0) { |
3ef6c40a | 3040 | error_setg_errno(errp, -ret, "Could not write qcow2 header"); |
a9420734 KW |
3041 | goto out; |
3042 | } | |
3043 | ||
b106ad91 KW |
3044 | /* Write a refcount table with one refcount block */ |
3045 | refcount_table = g_malloc0(2 * cluster_size); | |
3046 | refcount_table[0] = cpu_to_be64(2 * cluster_size); | |
8341f00d | 3047 | ret = blk_pwrite(blk, cluster_size, refcount_table, 2 * cluster_size, 0); |
7267c094 | 3048 | g_free(refcount_table); |
a9420734 KW |
3049 | |
3050 | if (ret < 0) { | |
3ef6c40a | 3051 | error_setg_errno(errp, -ret, "Could not write refcount table"); |
a9420734 KW |
3052 | goto out; |
3053 | } | |
3054 | ||
23588797 KW |
3055 | blk_unref(blk); |
3056 | blk = NULL; | |
a9420734 KW |
3057 | |
3058 | /* | |
3059 | * And now open the image and make it consistent first (i.e. increase the | |
3060 | * refcount of the cluster that is occupied by the header and the refcount | |
3061 | * table) | |
3062 | */ | |
e6641719 | 3063 | options = qdict_new(); |
46f5ac20 | 3064 | qdict_put_str(options, "driver", "qcow2"); |
cbf2b7c4 | 3065 | qdict_put_str(options, "file", bs->node_name); |
dcc98687 KW |
3066 | if (data_bs) { |
3067 | qdict_put_str(options, "data-file", data_bs->node_name); | |
3068 | } | |
cbf2b7c4 | 3069 | blk = blk_new_open(NULL, NULL, options, |
55880601 KW |
3070 | BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_NO_FLUSH, |
3071 | &local_err); | |
23588797 | 3072 | if (blk == NULL) { |
3ef6c40a | 3073 | error_propagate(errp, local_err); |
23588797 | 3074 | ret = -EIO; |
a9420734 KW |
3075 | goto out; |
3076 | } | |
3077 | ||
23588797 | 3078 | ret = qcow2_alloc_clusters(blk_bs(blk), 3 * cluster_size); |
a9420734 | 3079 | if (ret < 0) { |
3ef6c40a HR |
3080 | error_setg_errno(errp, -ret, "Could not allocate clusters for qcow2 " |
3081 | "header and refcount table"); | |
a9420734 KW |
3082 | goto out; |
3083 | ||
3084 | } else if (ret != 0) { | |
3085 | error_report("Huh, first cluster in empty image is already in use?"); | |
3086 | abort(); | |
3087 | } | |
3088 | ||
b527c9b3 | 3089 | /* Create a full header (including things like feature table) */ |
23588797 | 3090 | ret = qcow2_update_header(blk_bs(blk)); |
b527c9b3 KW |
3091 | if (ret < 0) { |
3092 | error_setg_errno(errp, -ret, "Could not update qcow2 header"); | |
3093 | goto out; | |
3094 | } | |
3095 | ||
a9420734 | 3096 | /* Okay, now that we have a valid image, let's give it the right size */ |
c5e86ebc | 3097 | ret = blk_truncate(blk, qcow2_opts->size, qcow2_opts->preallocation, errp); |
a9420734 | 3098 | if (ret < 0) { |
ed3d2ec9 | 3099 | error_prepend(errp, "Could not resize image: "); |
a9420734 KW |
3100 | goto out; |
3101 | } | |
3102 | ||
3103 | /* Want a backing file? There you go.*/ | |
29ca9e45 KW |
3104 | if (qcow2_opts->has_backing_file) { |
3105 | const char *backing_format = NULL; | |
3106 | ||
3107 | if (qcow2_opts->has_backing_fmt) { | |
3108 | backing_format = BlockdevDriver_str(qcow2_opts->backing_fmt); | |
3109 | } | |
3110 | ||
3111 | ret = bdrv_change_backing_file(blk_bs(blk), qcow2_opts->backing_file, | |
3112 | backing_format); | |
a9420734 | 3113 | if (ret < 0) { |
3ef6c40a | 3114 | error_setg_errno(errp, -ret, "Could not assign backing file '%s' " |
29ca9e45 KW |
3115 | "with format '%s'", qcow2_opts->backing_file, |
3116 | backing_format); | |
a9420734 KW |
3117 | goto out; |
3118 | } | |
3119 | } | |
3120 | ||
b25b387f | 3121 | /* Want encryption? There you go. */ |
60900b7b KW |
3122 | if (qcow2_opts->has_encrypt) { |
3123 | ret = qcow2_set_up_encryption(blk_bs(blk), qcow2_opts->encrypt, errp); | |
b25b387f DB |
3124 | if (ret < 0) { |
3125 | goto out; | |
3126 | } | |
3127 | } | |
3128 | ||
23588797 KW |
3129 | blk_unref(blk); |
3130 | blk = NULL; | |
ba2ab2f2 | 3131 | |
b25b387f DB |
3132 | /* Reopen the image without BDRV_O_NO_FLUSH to flush it before returning. |
3133 | * Using BDRV_O_NO_IO, since encryption is now setup we don't want to | |
3134 | * have to setup decryption context. We're not doing any I/O on the top | |
3135 | * level BlockDriverState, only lower layers, where BDRV_O_NO_IO does | |
3136 | * not have effect. | |
3137 | */ | |
e6641719 | 3138 | options = qdict_new(); |
46f5ac20 | 3139 | qdict_put_str(options, "driver", "qcow2"); |
cbf2b7c4 | 3140 | qdict_put_str(options, "file", bs->node_name); |
dcc98687 KW |
3141 | if (data_bs) { |
3142 | qdict_put_str(options, "data-file", data_bs->node_name); | |
3143 | } | |
cbf2b7c4 | 3144 | blk = blk_new_open(NULL, NULL, options, |
b25b387f DB |
3145 | BDRV_O_RDWR | BDRV_O_NO_BACKING | BDRV_O_NO_IO, |
3146 | &local_err); | |
23588797 | 3147 | if (blk == NULL) { |
ba2ab2f2 | 3148 | error_propagate(errp, local_err); |
23588797 | 3149 | ret = -EIO; |
ba2ab2f2 HR |
3150 | goto out; |
3151 | } | |
3152 | ||
a9420734 KW |
3153 | ret = 0; |
3154 | out: | |
e1d74bc6 KW |
3155 | blk_unref(blk); |
3156 | bdrv_unref(bs); | |
dcc98687 | 3157 | bdrv_unref(data_bs); |
a9420734 KW |
3158 | return ret; |
3159 | } | |
de5f3f40 | 3160 | |
efc75e2a SH |
3161 | static int coroutine_fn qcow2_co_create_opts(const char *filename, QemuOpts *opts, |
3162 | Error **errp) | |
de5f3f40 | 3163 | { |
b76b4f60 | 3164 | BlockdevCreateOptions *create_options = NULL; |
92adf9db | 3165 | QDict *qdict; |
b76b4f60 | 3166 | Visitor *v; |
cbf2b7c4 | 3167 | BlockDriverState *bs = NULL; |
3ef6c40a | 3168 | Error *local_err = NULL; |
b76b4f60 | 3169 | const char *val; |
3ef6c40a | 3170 | int ret; |
de5f3f40 | 3171 | |
b76b4f60 KW |
3172 | /* Only the keyval visitor supports the dotted syntax needed for |
3173 | * encryption, so go through a QDict before getting a QAPI type. Ignore | |
3174 | * options meant for the protocol layer so that the visitor doesn't | |
3175 | * complain. */ | |
3176 | qdict = qemu_opts_to_qdict_filtered(opts, NULL, bdrv_qcow2.create_opts, | |
3177 | true); | |
3178 | ||
3179 | /* Handle encryption options */ | |
3180 | val = qdict_get_try_str(qdict, BLOCK_OPT_ENCRYPT); | |
3181 | if (val && !strcmp(val, "on")) { | |
3182 | qdict_put_str(qdict, BLOCK_OPT_ENCRYPT, "qcow"); | |
3183 | } else if (val && !strcmp(val, "off")) { | |
3184 | qdict_del(qdict, BLOCK_OPT_ENCRYPT); | |
3185 | } | |
3186 | ||
3187 | val = qdict_get_try_str(qdict, BLOCK_OPT_ENCRYPT_FORMAT); | |
3188 | if (val && !strcmp(val, "aes")) { | |
3189 | qdict_put_str(qdict, BLOCK_OPT_ENCRYPT_FORMAT, "qcow"); | |
3190 | } | |
3191 | ||
3192 | /* Convert compat=0.10/1.1 into compat=v2/v3, to be renamed into | |
3193 | * version=v2/v3 below. */ | |
3194 | val = qdict_get_try_str(qdict, BLOCK_OPT_COMPAT_LEVEL); | |
3195 | if (val && !strcmp(val, "0.10")) { | |
3196 | qdict_put_str(qdict, BLOCK_OPT_COMPAT_LEVEL, "v2"); | |
3197 | } else if (val && !strcmp(val, "1.1")) { | |
3198 | qdict_put_str(qdict, BLOCK_OPT_COMPAT_LEVEL, "v3"); | |
3199 | } | |
3200 | ||
3201 | /* Change legacy command line options into QMP ones */ | |
3202 | static const QDictRenames opt_renames[] = { | |
3203 | { BLOCK_OPT_BACKING_FILE, "backing-file" }, | |
3204 | { BLOCK_OPT_BACKING_FMT, "backing-fmt" }, | |
3205 | { BLOCK_OPT_CLUSTER_SIZE, "cluster-size" }, | |
3206 | { BLOCK_OPT_LAZY_REFCOUNTS, "lazy-refcounts" }, | |
3207 | { BLOCK_OPT_REFCOUNT_BITS, "refcount-bits" }, | |
3208 | { BLOCK_OPT_ENCRYPT, BLOCK_OPT_ENCRYPT_FORMAT }, | |
3209 | { BLOCK_OPT_COMPAT_LEVEL, "version" }, | |
3210 | { NULL, NULL }, | |
3211 | }; | |
3212 | ||
3213 | if (!qdict_rename_keys(qdict, opt_renames, errp)) { | |
29ca9e45 KW |
3214 | ret = -EINVAL; |
3215 | goto finish; | |
3216 | } | |
60900b7b | 3217 | |
b76b4f60 KW |
3218 | /* Create and open the file (protocol layer) */ |
3219 | ret = bdrv_create_file(filename, opts, errp); | |
3220 | if (ret < 0) { | |
0eb4a8c1 SH |
3221 | goto finish; |
3222 | } | |
b76b4f60 KW |
3223 | |
3224 | bs = bdrv_open(filename, NULL, NULL, | |
3225 | BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, errp); | |
3226 | if (bs == NULL) { | |
3227 | ret = -EIO; | |
1bd0e2d1 CL |
3228 | goto finish; |
3229 | } | |
0eb4a8c1 | 3230 | |
b76b4f60 KW |
3231 | /* Set 'driver' and 'node' options */ |
3232 | qdict_put_str(qdict, "driver", "qcow2"); | |
3233 | qdict_put_str(qdict, "file", bs->node_name); | |
3234 | ||
3235 | /* Now get the QAPI type BlockdevCreateOptions */ | |
af91062e MA |
3236 | v = qobject_input_visitor_new_flat_confused(qdict, errp); |
3237 | if (!v) { | |
1bd0e2d1 CL |
3238 | ret = -EINVAL; |
3239 | goto finish; | |
3240 | } | |
3241 | ||
b76b4f60 KW |
3242 | visit_type_BlockdevCreateOptions(v, NULL, &create_options, &local_err); |
3243 | visit_free(v); | |
de5f3f40 | 3244 | |
0eb4a8c1 SH |
3245 | if (local_err) { |
3246 | error_propagate(errp, local_err); | |
bd4b167f HR |
3247 | ret = -EINVAL; |
3248 | goto finish; | |
3249 | } | |
3250 | ||
b76b4f60 KW |
3251 | /* Silently round up size */ |
3252 | create_options->u.qcow2.size = ROUND_UP(create_options->u.qcow2.size, | |
3253 | BDRV_SECTOR_SIZE); | |
cbf2b7c4 KW |
3254 | |
3255 | /* Create the qcow2 image (format layer) */ | |
b76b4f60 | 3256 | ret = qcow2_co_create(create_options, errp); |
cbf2b7c4 KW |
3257 | if (ret < 0) { |
3258 | goto finish; | |
3259 | } | |
1bd0e2d1 | 3260 | |
b76b4f60 | 3261 | ret = 0; |
1bd0e2d1 | 3262 | finish: |
cb3e7f08 | 3263 | qobject_unref(qdict); |
cbf2b7c4 | 3264 | bdrv_unref(bs); |
b76b4f60 | 3265 | qapi_free_BlockdevCreateOptions(create_options); |
3ef6c40a | 3266 | return ret; |
de5f3f40 KW |
3267 | } |
3268 | ||
2928abce | 3269 | |
f06f6b66 | 3270 | static bool is_zero(BlockDriverState *bs, int64_t offset, int64_t bytes) |
2928abce | 3271 | { |
31826642 EB |
3272 | int64_t nr; |
3273 | int res; | |
f06f6b66 EB |
3274 | |
3275 | /* Clamp to image length, before checking status of underlying sectors */ | |
8cbf74b2 EB |
3276 | if (offset + bytes > bs->total_sectors * BDRV_SECTOR_SIZE) { |
3277 | bytes = bs->total_sectors * BDRV_SECTOR_SIZE - offset; | |
fbaa6bb3 EB |
3278 | } |
3279 | ||
f06f6b66 | 3280 | if (!bytes) { |
ebb718a5 EB |
3281 | return true; |
3282 | } | |
8cbf74b2 | 3283 | res = bdrv_block_status_above(bs, NULL, offset, bytes, &nr, NULL, NULL); |
31826642 | 3284 | return res >= 0 && (res & BDRV_BLOCK_ZERO) && nr == bytes; |
2928abce DL |
3285 | } |
3286 | ||
5544b59f | 3287 | static coroutine_fn int qcow2_co_pwrite_zeroes(BlockDriverState *bs, |
f5a5ca79 | 3288 | int64_t offset, int bytes, BdrvRequestFlags flags) |
621f0589 KW |
3289 | { |
3290 | int ret; | |
ff99129a | 3291 | BDRVQcow2State *s = bs->opaque; |
621f0589 | 3292 | |
5544b59f | 3293 | uint32_t head = offset % s->cluster_size; |
f5a5ca79 | 3294 | uint32_t tail = (offset + bytes) % s->cluster_size; |
2928abce | 3295 | |
f5a5ca79 MP |
3296 | trace_qcow2_pwrite_zeroes_start_req(qemu_coroutine_self(), offset, bytes); |
3297 | if (offset + bytes == bs->total_sectors * BDRV_SECTOR_SIZE) { | |
fbaa6bb3 EB |
3298 | tail = 0; |
3299 | } | |
5a64e942 | 3300 | |
ebb718a5 | 3301 | if (head || tail) { |
ebb718a5 | 3302 | uint64_t off; |
ecfe1863 | 3303 | unsigned int nr; |
2928abce | 3304 | |
f5a5ca79 | 3305 | assert(head + bytes <= s->cluster_size); |
2928abce | 3306 | |
ebb718a5 | 3307 | /* check whether remainder of cluster already reads as zero */ |
f06f6b66 EB |
3308 | if (!(is_zero(bs, offset - head, head) && |
3309 | is_zero(bs, offset + bytes, | |
3310 | tail ? s->cluster_size - tail : 0))) { | |
2928abce DL |
3311 | return -ENOTSUP; |
3312 | } | |
3313 | ||
2928abce DL |
3314 | qemu_co_mutex_lock(&s->lock); |
3315 | /* We can have new write after previous check */ | |
f06f6b66 | 3316 | offset = QEMU_ALIGN_DOWN(offset, s->cluster_size); |
f5a5ca79 | 3317 | bytes = s->cluster_size; |
ecfe1863 | 3318 | nr = s->cluster_size; |
5544b59f | 3319 | ret = qcow2_get_cluster_offset(bs, offset, &nr, &off); |
fdfab37d EB |
3320 | if (ret != QCOW2_CLUSTER_UNALLOCATED && |
3321 | ret != QCOW2_CLUSTER_ZERO_PLAIN && | |
3322 | ret != QCOW2_CLUSTER_ZERO_ALLOC) { | |
2928abce DL |
3323 | qemu_co_mutex_unlock(&s->lock); |
3324 | return -ENOTSUP; | |
3325 | } | |
3326 | } else { | |
3327 | qemu_co_mutex_lock(&s->lock); | |
621f0589 KW |
3328 | } |
3329 | ||
f5a5ca79 | 3330 | trace_qcow2_pwrite_zeroes(qemu_coroutine_self(), offset, bytes); |
5a64e942 | 3331 | |
621f0589 | 3332 | /* Whatever is left can use real zero clusters */ |
f5a5ca79 | 3333 | ret = qcow2_cluster_zeroize(bs, offset, bytes, flags); |
621f0589 KW |
3334 | qemu_co_mutex_unlock(&s->lock); |
3335 | ||
3336 | return ret; | |
3337 | } | |
3338 | ||
82e8a788 | 3339 | static coroutine_fn int qcow2_co_pdiscard(BlockDriverState *bs, |
f5a5ca79 | 3340 | int64_t offset, int bytes) |
5ea929e3 | 3341 | { |
6db39ae2 | 3342 | int ret; |
ff99129a | 3343 | BDRVQcow2State *s = bs->opaque; |
6db39ae2 | 3344 | |
f5a5ca79 MP |
3345 | if (!QEMU_IS_ALIGNED(offset | bytes, s->cluster_size)) { |
3346 | assert(bytes < s->cluster_size); | |
048c5fd1 EB |
3347 | /* Ignore partial clusters, except for the special case of the |
3348 | * complete partial cluster at the end of an unaligned file */ | |
3349 | if (!QEMU_IS_ALIGNED(offset, s->cluster_size) || | |
f5a5ca79 | 3350 | offset + bytes != bs->total_sectors * BDRV_SECTOR_SIZE) { |
048c5fd1 EB |
3351 | return -ENOTSUP; |
3352 | } | |
49228d1e EB |
3353 | } |
3354 | ||
6db39ae2 | 3355 | qemu_co_mutex_lock(&s->lock); |
f5a5ca79 | 3356 | ret = qcow2_cluster_discard(bs, offset, bytes, QCOW2_DISCARD_REQUEST, |
d2cb36af | 3357 | false); |
6db39ae2 PB |
3358 | qemu_co_mutex_unlock(&s->lock); |
3359 | return ret; | |
5ea929e3 KW |
3360 | } |
3361 | ||
fd9fcd37 FZ |
3362 | static int coroutine_fn |
3363 | qcow2_co_copy_range_from(BlockDriverState *bs, | |
3364 | BdrvChild *src, uint64_t src_offset, | |
3365 | BdrvChild *dst, uint64_t dst_offset, | |
67b51fb9 VSO |
3366 | uint64_t bytes, BdrvRequestFlags read_flags, |
3367 | BdrvRequestFlags write_flags) | |
fd9fcd37 FZ |
3368 | { |
3369 | BDRVQcow2State *s = bs->opaque; | |
3370 | int ret; | |
3371 | unsigned int cur_bytes; /* number of bytes in current iteration */ | |
3372 | BdrvChild *child = NULL; | |
67b51fb9 | 3373 | BdrvRequestFlags cur_write_flags; |
fd9fcd37 FZ |
3374 | |
3375 | assert(!bs->encrypted); | |
3376 | qemu_co_mutex_lock(&s->lock); | |
3377 | ||
3378 | while (bytes != 0) { | |
3379 | uint64_t copy_offset = 0; | |
3380 | /* prepare next request */ | |
3381 | cur_bytes = MIN(bytes, INT_MAX); | |
67b51fb9 | 3382 | cur_write_flags = write_flags; |
fd9fcd37 FZ |
3383 | |
3384 | ret = qcow2_get_cluster_offset(bs, src_offset, &cur_bytes, ©_offset); | |
3385 | if (ret < 0) { | |
3386 | goto out; | |
3387 | } | |
3388 | ||
3389 | switch (ret) { | |
3390 | case QCOW2_CLUSTER_UNALLOCATED: | |
3391 | if (bs->backing && bs->backing->bs) { | |
3392 | int64_t backing_length = bdrv_getlength(bs->backing->bs); | |
3393 | if (src_offset >= backing_length) { | |
67b51fb9 | 3394 | cur_write_flags |= BDRV_REQ_ZERO_WRITE; |
fd9fcd37 FZ |
3395 | } else { |
3396 | child = bs->backing; | |
3397 | cur_bytes = MIN(cur_bytes, backing_length - src_offset); | |
3398 | copy_offset = src_offset; | |
3399 | } | |
3400 | } else { | |
67b51fb9 | 3401 | cur_write_flags |= BDRV_REQ_ZERO_WRITE; |
fd9fcd37 FZ |
3402 | } |
3403 | break; | |
3404 | ||
3405 | case QCOW2_CLUSTER_ZERO_PLAIN: | |
3406 | case QCOW2_CLUSTER_ZERO_ALLOC: | |
67b51fb9 | 3407 | cur_write_flags |= BDRV_REQ_ZERO_WRITE; |
fd9fcd37 FZ |
3408 | break; |
3409 | ||
3410 | case QCOW2_CLUSTER_COMPRESSED: | |
3411 | ret = -ENOTSUP; | |
3412 | goto out; | |
fd9fcd37 FZ |
3413 | |
3414 | case QCOW2_CLUSTER_NORMAL: | |
966b000f | 3415 | child = s->data_file; |
fd9fcd37 FZ |
3416 | copy_offset += offset_into_cluster(s, src_offset); |
3417 | if ((copy_offset & 511) != 0) { | |
3418 | ret = -EIO; | |
3419 | goto out; | |
3420 | } | |
3421 | break; | |
3422 | ||
3423 | default: | |
3424 | abort(); | |
3425 | } | |
3426 | qemu_co_mutex_unlock(&s->lock); | |
3427 | ret = bdrv_co_copy_range_from(child, | |
3428 | copy_offset, | |
3429 | dst, dst_offset, | |
67b51fb9 | 3430 | cur_bytes, read_flags, cur_write_flags); |
fd9fcd37 FZ |
3431 | qemu_co_mutex_lock(&s->lock); |
3432 | if (ret < 0) { | |
3433 | goto out; | |
3434 | } | |
3435 | ||
3436 | bytes -= cur_bytes; | |
3437 | src_offset += cur_bytes; | |
3438 | dst_offset += cur_bytes; | |
3439 | } | |
3440 | ret = 0; | |
3441 | ||
3442 | out: | |
3443 | qemu_co_mutex_unlock(&s->lock); | |
3444 | return ret; | |
3445 | } | |
3446 | ||
3447 | static int coroutine_fn | |
3448 | qcow2_co_copy_range_to(BlockDriverState *bs, | |
3449 | BdrvChild *src, uint64_t src_offset, | |
3450 | BdrvChild *dst, uint64_t dst_offset, | |
67b51fb9 VSO |
3451 | uint64_t bytes, BdrvRequestFlags read_flags, |
3452 | BdrvRequestFlags write_flags) | |
fd9fcd37 FZ |
3453 | { |
3454 | BDRVQcow2State *s = bs->opaque; | |
3455 | int offset_in_cluster; | |
3456 | int ret; | |
3457 | unsigned int cur_bytes; /* number of sectors in current iteration */ | |
3458 | uint64_t cluster_offset; | |
fd9fcd37 FZ |
3459 | QCowL2Meta *l2meta = NULL; |
3460 | ||
3461 | assert(!bs->encrypted); | |
fd9fcd37 FZ |
3462 | |
3463 | qemu_co_mutex_lock(&s->lock); | |
3464 | ||
3465 | while (bytes != 0) { | |
3466 | ||
3467 | l2meta = NULL; | |
3468 | ||
3469 | offset_in_cluster = offset_into_cluster(s, dst_offset); | |
3470 | cur_bytes = MIN(bytes, INT_MAX); | |
3471 | ||
3472 | /* TODO: | |
3473 | * If src->bs == dst->bs, we could simply copy by incrementing | |
3474 | * the refcnt, without copying user data. | |
3475 | * Or if src->bs == dst->bs->backing->bs, we could copy by discarding. */ | |
3476 | ret = qcow2_alloc_cluster_offset(bs, dst_offset, &cur_bytes, | |
3477 | &cluster_offset, &l2meta); | |
3478 | if (ret < 0) { | |
3479 | goto fail; | |
3480 | } | |
3481 | ||
3482 | assert((cluster_offset & 511) == 0); | |
3483 | ||
3484 | ret = qcow2_pre_write_overlap_check(bs, 0, | |
966b000f | 3485 | cluster_offset + offset_in_cluster, cur_bytes, true); |
fd9fcd37 FZ |
3486 | if (ret < 0) { |
3487 | goto fail; | |
3488 | } | |
3489 | ||
3490 | qemu_co_mutex_unlock(&s->lock); | |
3491 | ret = bdrv_co_copy_range_to(src, src_offset, | |
966b000f | 3492 | s->data_file, |
fd9fcd37 | 3493 | cluster_offset + offset_in_cluster, |
67b51fb9 | 3494 | cur_bytes, read_flags, write_flags); |
fd9fcd37 FZ |
3495 | qemu_co_mutex_lock(&s->lock); |
3496 | if (ret < 0) { | |
3497 | goto fail; | |
3498 | } | |
3499 | ||
3500 | ret = qcow2_handle_l2meta(bs, &l2meta, true); | |
3501 | if (ret) { | |
3502 | goto fail; | |
3503 | } | |
3504 | ||
3505 | bytes -= cur_bytes; | |
e06f4639 | 3506 | src_offset += cur_bytes; |
fd9fcd37 FZ |
3507 | dst_offset += cur_bytes; |
3508 | } | |
3509 | ret = 0; | |
3510 | ||
3511 | fail: | |
3512 | qcow2_handle_l2meta(bs, &l2meta, false); | |
3513 | ||
3514 | qemu_co_mutex_unlock(&s->lock); | |
3515 | ||
fd9fcd37 FZ |
3516 | trace_qcow2_writev_done_req(qemu_coroutine_self(), ret); |
3517 | ||
3518 | return ret; | |
3519 | } | |
3520 | ||
061ca8a3 KW |
3521 | static int coroutine_fn qcow2_co_truncate(BlockDriverState *bs, int64_t offset, |
3522 | PreallocMode prealloc, Error **errp) | |
419b19d9 | 3523 | { |
ff99129a | 3524 | BDRVQcow2State *s = bs->opaque; |
95b98f34 | 3525 | uint64_t old_length; |
2cf7cfa1 KW |
3526 | int64_t new_l1_size; |
3527 | int ret; | |
45b4949c | 3528 | QDict *options; |
419b19d9 | 3529 | |
772d1f97 HR |
3530 | if (prealloc != PREALLOC_MODE_OFF && prealloc != PREALLOC_MODE_METADATA && |
3531 | prealloc != PREALLOC_MODE_FALLOC && prealloc != PREALLOC_MODE_FULL) | |
3532 | { | |
8243ccb7 | 3533 | error_setg(errp, "Unsupported preallocation mode '%s'", |
977c736f | 3534 | PreallocMode_str(prealloc)); |
8243ccb7 HR |
3535 | return -ENOTSUP; |
3536 | } | |
3537 | ||
419b19d9 | 3538 | if (offset & 511) { |
4bff28b8 | 3539 | error_setg(errp, "The new size must be a multiple of 512"); |
419b19d9 SH |
3540 | return -EINVAL; |
3541 | } | |
3542 | ||
061ca8a3 KW |
3543 | qemu_co_mutex_lock(&s->lock); |
3544 | ||
419b19d9 SH |
3545 | /* cannot proceed if image has snapshots */ |
3546 | if (s->nb_snapshots) { | |
4bff28b8 | 3547 | error_setg(errp, "Can't resize an image which has snapshots"); |
061ca8a3 KW |
3548 | ret = -ENOTSUP; |
3549 | goto fail; | |
419b19d9 SH |
3550 | } |
3551 | ||
88ddffae VSO |
3552 | /* cannot proceed if image has bitmaps */ |
3553 | if (s->nb_bitmaps) { | |
3554 | /* TODO: resize bitmaps in the image */ | |
3555 | error_setg(errp, "Can't resize an image which has bitmaps"); | |
061ca8a3 KW |
3556 | ret = -ENOTSUP; |
3557 | goto fail; | |
88ddffae VSO |
3558 | } |
3559 | ||
bd016b91 | 3560 | old_length = bs->total_sectors * BDRV_SECTOR_SIZE; |
46b732cd | 3561 | new_l1_size = size_to_l1(s, offset); |
95b98f34 | 3562 | |
95b98f34 | 3563 | if (offset < old_length) { |
163bc39d | 3564 | int64_t last_cluster, old_file_size; |
46b732cd PB |
3565 | if (prealloc != PREALLOC_MODE_OFF) { |
3566 | error_setg(errp, | |
3567 | "Preallocation can't be used for shrinking an image"); | |
061ca8a3 KW |
3568 | ret = -EINVAL; |
3569 | goto fail; | |
46b732cd | 3570 | } |
419b19d9 | 3571 | |
46b732cd PB |
3572 | ret = qcow2_cluster_discard(bs, ROUND_UP(offset, s->cluster_size), |
3573 | old_length - ROUND_UP(offset, | |
3574 | s->cluster_size), | |
3575 | QCOW2_DISCARD_ALWAYS, true); | |
3576 | if (ret < 0) { | |
3577 | error_setg_errno(errp, -ret, "Failed to discard cropped clusters"); | |
061ca8a3 | 3578 | goto fail; |
46b732cd PB |
3579 | } |
3580 | ||
3581 | ret = qcow2_shrink_l1_table(bs, new_l1_size); | |
3582 | if (ret < 0) { | |
3583 | error_setg_errno(errp, -ret, | |
3584 | "Failed to reduce the number of L2 tables"); | |
061ca8a3 | 3585 | goto fail; |
46b732cd PB |
3586 | } |
3587 | ||
3588 | ret = qcow2_shrink_reftable(bs); | |
3589 | if (ret < 0) { | |
3590 | error_setg_errno(errp, -ret, | |
3591 | "Failed to discard unused refblocks"); | |
061ca8a3 | 3592 | goto fail; |
46b732cd | 3593 | } |
163bc39d PB |
3594 | |
3595 | old_file_size = bdrv_getlength(bs->file->bs); | |
3596 | if (old_file_size < 0) { | |
3597 | error_setg_errno(errp, -old_file_size, | |
3598 | "Failed to inquire current file length"); | |
061ca8a3 KW |
3599 | ret = old_file_size; |
3600 | goto fail; | |
163bc39d PB |
3601 | } |
3602 | last_cluster = qcow2_get_last_cluster(bs, old_file_size); | |
3603 | if (last_cluster < 0) { | |
3604 | error_setg_errno(errp, -last_cluster, | |
3605 | "Failed to find the last cluster"); | |
061ca8a3 KW |
3606 | ret = last_cluster; |
3607 | goto fail; | |
163bc39d PB |
3608 | } |
3609 | if ((last_cluster + 1) * s->cluster_size < old_file_size) { | |
233521b1 HR |
3610 | Error *local_err = NULL; |
3611 | ||
061ca8a3 KW |
3612 | bdrv_co_truncate(bs->file, (last_cluster + 1) * s->cluster_size, |
3613 | PREALLOC_MODE_OFF, &local_err); | |
233521b1 HR |
3614 | if (local_err) { |
3615 | warn_reportf_err(local_err, | |
3616 | "Failed to truncate the tail of the image: "); | |
163bc39d PB |
3617 | } |
3618 | } | |
46b732cd PB |
3619 | } else { |
3620 | ret = qcow2_grow_l1_table(bs, new_l1_size, true); | |
3621 | if (ret < 0) { | |
3622 | error_setg_errno(errp, -ret, "Failed to grow the L1 table"); | |
061ca8a3 | 3623 | goto fail; |
46b732cd | 3624 | } |
419b19d9 SH |
3625 | } |
3626 | ||
95b98f34 HR |
3627 | switch (prealloc) { |
3628 | case PREALLOC_MODE_OFF: | |
3629 | break; | |
3630 | ||
3631 | case PREALLOC_MODE_METADATA: | |
47e86b86 | 3632 | ret = preallocate_co(bs, old_length, offset); |
95b98f34 HR |
3633 | if (ret < 0) { |
3634 | error_setg_errno(errp, -ret, "Preallocation failed"); | |
061ca8a3 | 3635 | goto fail; |
95b98f34 HR |
3636 | } |
3637 | break; | |
3638 | ||
772d1f97 HR |
3639 | case PREALLOC_MODE_FALLOC: |
3640 | case PREALLOC_MODE_FULL: | |
3641 | { | |
3642 | int64_t allocation_start, host_offset, guest_offset; | |
3643 | int64_t clusters_allocated; | |
3644 | int64_t old_file_size, new_file_size; | |
3645 | uint64_t nb_new_data_clusters, nb_new_l2_tables; | |
3646 | ||
966b000f KW |
3647 | /* With a data file, preallocation means just allocating the metadata |
3648 | * and forwarding the truncate request to the data file */ | |
3649 | if (has_data_file(bs)) { | |
3650 | ret = preallocate_co(bs, old_length, offset); | |
3651 | if (ret < 0) { | |
3652 | error_setg_errno(errp, -ret, "Preallocation failed"); | |
3653 | goto fail; | |
3654 | } | |
3655 | break; | |
3656 | } | |
3657 | ||
772d1f97 HR |
3658 | old_file_size = bdrv_getlength(bs->file->bs); |
3659 | if (old_file_size < 0) { | |
3660 | error_setg_errno(errp, -old_file_size, | |
3661 | "Failed to inquire current file length"); | |
061ca8a3 KW |
3662 | ret = old_file_size; |
3663 | goto fail; | |
772d1f97 | 3664 | } |
e400ad1e | 3665 | old_file_size = ROUND_UP(old_file_size, s->cluster_size); |
772d1f97 HR |
3666 | |
3667 | nb_new_data_clusters = DIV_ROUND_UP(offset - old_length, | |
3668 | s->cluster_size); | |
3669 | ||
3670 | /* This is an overestimation; we will not actually allocate space for | |
3671 | * these in the file but just make sure the new refcount structures are | |
3672 | * able to cover them so we will not have to allocate new refblocks | |
3673 | * while entering the data blocks in the potentially new L2 tables. | |
3674 | * (We do not actually care where the L2 tables are placed. Maybe they | |
3675 | * are already allocated or they can be placed somewhere before | |
3676 | * @old_file_size. It does not matter because they will be fully | |
3677 | * allocated automatically, so they do not need to be covered by the | |
3678 | * preallocation. All that matters is that we will not have to allocate | |
3679 | * new refcount structures for them.) */ | |
3680 | nb_new_l2_tables = DIV_ROUND_UP(nb_new_data_clusters, | |
3681 | s->cluster_size / sizeof(uint64_t)); | |
3682 | /* The cluster range may not be aligned to L2 boundaries, so add one L2 | |
3683 | * table for a potential head/tail */ | |
3684 | nb_new_l2_tables++; | |
3685 | ||
3686 | allocation_start = qcow2_refcount_area(bs, old_file_size, | |
3687 | nb_new_data_clusters + | |
3688 | nb_new_l2_tables, | |
3689 | true, 0, 0); | |
3690 | if (allocation_start < 0) { | |
3691 | error_setg_errno(errp, -allocation_start, | |
3692 | "Failed to resize refcount structures"); | |
061ca8a3 KW |
3693 | ret = allocation_start; |
3694 | goto fail; | |
772d1f97 HR |
3695 | } |
3696 | ||
3697 | clusters_allocated = qcow2_alloc_clusters_at(bs, allocation_start, | |
3698 | nb_new_data_clusters); | |
3699 | if (clusters_allocated < 0) { | |
3700 | error_setg_errno(errp, -clusters_allocated, | |
3701 | "Failed to allocate data clusters"); | |
061ca8a3 KW |
3702 | ret = clusters_allocated; |
3703 | goto fail; | |
772d1f97 HR |
3704 | } |
3705 | ||
3706 | assert(clusters_allocated == nb_new_data_clusters); | |
3707 | ||
3708 | /* Allocate the data area */ | |
3709 | new_file_size = allocation_start + | |
3710 | nb_new_data_clusters * s->cluster_size; | |
061ca8a3 | 3711 | ret = bdrv_co_truncate(bs->file, new_file_size, prealloc, errp); |
772d1f97 HR |
3712 | if (ret < 0) { |
3713 | error_prepend(errp, "Failed to resize underlying file: "); | |
3714 | qcow2_free_clusters(bs, allocation_start, | |
3715 | nb_new_data_clusters * s->cluster_size, | |
3716 | QCOW2_DISCARD_OTHER); | |
061ca8a3 | 3717 | goto fail; |
772d1f97 HR |
3718 | } |
3719 | ||
3720 | /* Create the necessary L2 entries */ | |
3721 | host_offset = allocation_start; | |
3722 | guest_offset = old_length; | |
3723 | while (nb_new_data_clusters) { | |
13bec229 AG |
3724 | int64_t nb_clusters = MIN( |
3725 | nb_new_data_clusters, | |
3726 | s->l2_slice_size - offset_to_l2_slice_index(s, guest_offset)); | |
772d1f97 HR |
3727 | QCowL2Meta allocation = { |
3728 | .offset = guest_offset, | |
3729 | .alloc_offset = host_offset, | |
3730 | .nb_clusters = nb_clusters, | |
3731 | }; | |
3732 | qemu_co_queue_init(&allocation.dependent_requests); | |
3733 | ||
3734 | ret = qcow2_alloc_cluster_link_l2(bs, &allocation); | |
3735 | if (ret < 0) { | |
3736 | error_setg_errno(errp, -ret, "Failed to update L2 tables"); | |
3737 | qcow2_free_clusters(bs, host_offset, | |
3738 | nb_new_data_clusters * s->cluster_size, | |
3739 | QCOW2_DISCARD_OTHER); | |
061ca8a3 | 3740 | goto fail; |
772d1f97 HR |
3741 | } |
3742 | ||
3743 | guest_offset += nb_clusters * s->cluster_size; | |
3744 | host_offset += nb_clusters * s->cluster_size; | |
3745 | nb_new_data_clusters -= nb_clusters; | |
3746 | } | |
3747 | break; | |
3748 | } | |
3749 | ||
95b98f34 HR |
3750 | default: |
3751 | g_assert_not_reached(); | |
3752 | } | |
3753 | ||
3754 | if (prealloc != PREALLOC_MODE_OFF) { | |
3755 | /* Flush metadata before actually changing the image size */ | |
061ca8a3 | 3756 | ret = qcow2_write_caches(bs); |
95b98f34 HR |
3757 | if (ret < 0) { |
3758 | error_setg_errno(errp, -ret, | |
3759 | "Failed to flush the preallocated area to disk"); | |
061ca8a3 | 3760 | goto fail; |
95b98f34 HR |
3761 | } |
3762 | } | |
3763 | ||
45b4949c LB |
3764 | bs->total_sectors = offset / BDRV_SECTOR_SIZE; |
3765 | ||
966b000f KW |
3766 | if (has_data_file(bs)) { |
3767 | if (prealloc == PREALLOC_MODE_METADATA) { | |
3768 | prealloc = PREALLOC_MODE_OFF; | |
3769 | } | |
3770 | ret = bdrv_co_truncate(s->data_file, offset, prealloc, errp); | |
3771 | if (ret < 0) { | |
3772 | goto fail; | |
3773 | } | |
3774 | } | |
3775 | ||
419b19d9 SH |
3776 | /* write updated header.size */ |
3777 | offset = cpu_to_be64(offset); | |
d9ca2ea2 | 3778 | ret = bdrv_pwrite_sync(bs->file, offsetof(QCowHeader, size), |
8b3b7206 | 3779 | &offset, sizeof(uint64_t)); |
419b19d9 | 3780 | if (ret < 0) { |
f59adb32 | 3781 | error_setg_errno(errp, -ret, "Failed to update the image size"); |
061ca8a3 | 3782 | goto fail; |
419b19d9 SH |
3783 | } |
3784 | ||
3785 | s->l1_vm_state_index = new_l1_size; | |
45b4949c LB |
3786 | |
3787 | /* Update cache sizes */ | |
3788 | options = qdict_clone_shallow(bs->options); | |
3789 | ret = qcow2_update_options(bs, options, s->flags, errp); | |
3790 | qobject_unref(options); | |
3791 | if (ret < 0) { | |
3792 | goto fail; | |
3793 | } | |
061ca8a3 KW |
3794 | ret = 0; |
3795 | fail: | |
3796 | qemu_co_mutex_unlock(&s->lock); | |
3797 | return ret; | |
419b19d9 SH |
3798 | } |
3799 | ||
2714f13d VSO |
3800 | /* |
3801 | * qcow2_compress() | |
3802 | * | |
6994fd78 VSO |
3803 | * @dest - destination buffer, @dest_size bytes |
3804 | * @src - source buffer, @src_size bytes | |
2714f13d VSO |
3805 | * |
3806 | * Returns: compressed size on success | |
6994fd78 | 3807 | * -1 destination buffer is not enough to store compressed data |
2714f13d VSO |
3808 | * -2 on any other error |
3809 | */ | |
6994fd78 VSO |
3810 | static ssize_t qcow2_compress(void *dest, size_t dest_size, |
3811 | const void *src, size_t src_size) | |
2714f13d VSO |
3812 | { |
3813 | ssize_t ret; | |
3814 | z_stream strm; | |
3815 | ||
3816 | /* best compression, small window, no zlib header */ | |
3817 | memset(&strm, 0, sizeof(strm)); | |
3818 | ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION, Z_DEFLATED, | |
3819 | -12, 9, Z_DEFAULT_STRATEGY); | |
19a44488 | 3820 | if (ret != Z_OK) { |
2714f13d VSO |
3821 | return -2; |
3822 | } | |
3823 | ||
3824 | /* strm.next_in is not const in old zlib versions, such as those used on | |
3825 | * OpenBSD/NetBSD, so cast the const away */ | |
6994fd78 | 3826 | strm.avail_in = src_size; |
2714f13d | 3827 | strm.next_in = (void *) src; |
6994fd78 | 3828 | strm.avail_out = dest_size; |
2714f13d VSO |
3829 | strm.next_out = dest; |
3830 | ||
3831 | ret = deflate(&strm, Z_FINISH); | |
3832 | if (ret == Z_STREAM_END) { | |
6994fd78 | 3833 | ret = dest_size - strm.avail_out; |
2714f13d VSO |
3834 | } else { |
3835 | ret = (ret == Z_OK ? -1 : -2); | |
3836 | } | |
3837 | ||
3838 | deflateEnd(&strm); | |
3839 | ||
3840 | return ret; | |
3841 | } | |
3842 | ||
341926ab VSO |
3843 | /* |
3844 | * qcow2_decompress() | |
3845 | * | |
3846 | * Decompress some data (not more than @src_size bytes) to produce exactly | |
3847 | * @dest_size bytes. | |
3848 | * | |
3849 | * @dest - destination buffer, @dest_size bytes | |
3850 | * @src - source buffer, @src_size bytes | |
3851 | * | |
3852 | * Returns: 0 on success | |
3853 | * -1 on fail | |
3854 | */ | |
3855 | static ssize_t qcow2_decompress(void *dest, size_t dest_size, | |
3856 | const void *src, size_t src_size) | |
f4b3e2a9 | 3857 | { |
341926ab VSO |
3858 | int ret = 0; |
3859 | z_stream strm; | |
f4b3e2a9 | 3860 | |
341926ab VSO |
3861 | memset(&strm, 0, sizeof(strm)); |
3862 | strm.avail_in = src_size; | |
3863 | strm.next_in = (void *) src; | |
3864 | strm.avail_out = dest_size; | |
3865 | strm.next_out = dest; | |
f4b3e2a9 | 3866 | |
341926ab | 3867 | ret = inflateInit2(&strm, -12); |
f4b3e2a9 VSO |
3868 | if (ret != Z_OK) { |
3869 | return -1; | |
3870 | } | |
341926ab VSO |
3871 | |
3872 | ret = inflate(&strm, Z_FINISH); | |
3873 | if ((ret != Z_STREAM_END && ret != Z_BUF_ERROR) || strm.avail_out != 0) { | |
3874 | /* We approve Z_BUF_ERROR because we need @dest buffer to be filled, but | |
3875 | * @src buffer may be processed partly (because in qcow2 we know size of | |
3876 | * compressed data with precision of one sector) */ | |
3877 | ret = -1; | |
f4b3e2a9 | 3878 | } |
341926ab VSO |
3879 | |
3880 | inflateEnd(&strm); | |
3881 | ||
3882 | return ret; | |
f4b3e2a9 VSO |
3883 | } |
3884 | ||
ceb029cd VSO |
3885 | #define MAX_COMPRESS_THREADS 4 |
3886 | ||
e23c9d7a VSO |
3887 | typedef ssize_t (*Qcow2CompressFunc)(void *dest, size_t dest_size, |
3888 | const void *src, size_t src_size); | |
ceb029cd VSO |
3889 | typedef struct Qcow2CompressData { |
3890 | void *dest; | |
6994fd78 | 3891 | size_t dest_size; |
ceb029cd | 3892 | const void *src; |
6994fd78 | 3893 | size_t src_size; |
ceb029cd | 3894 | ssize_t ret; |
e23c9d7a VSO |
3895 | |
3896 | Qcow2CompressFunc func; | |
ceb029cd VSO |
3897 | } Qcow2CompressData; |
3898 | ||
3899 | static int qcow2_compress_pool_func(void *opaque) | |
3900 | { | |
3901 | Qcow2CompressData *data = opaque; | |
3902 | ||
e23c9d7a VSO |
3903 | data->ret = data->func(data->dest, data->dest_size, |
3904 | data->src, data->src_size); | |
ceb029cd VSO |
3905 | |
3906 | return 0; | |
3907 | } | |
3908 | ||
3909 | static void qcow2_compress_complete(void *opaque, int ret) | |
3910 | { | |
3911 | qemu_coroutine_enter(opaque); | |
3912 | } | |
3913 | ||
e23c9d7a VSO |
3914 | static ssize_t coroutine_fn |
3915 | qcow2_co_do_compress(BlockDriverState *bs, void *dest, size_t dest_size, | |
3916 | const void *src, size_t src_size, Qcow2CompressFunc func) | |
ceb029cd VSO |
3917 | { |
3918 | BDRVQcow2State *s = bs->opaque; | |
3919 | BlockAIOCB *acb; | |
3920 | ThreadPool *pool = aio_get_thread_pool(bdrv_get_aio_context(bs)); | |
3921 | Qcow2CompressData arg = { | |
3922 | .dest = dest, | |
6994fd78 | 3923 | .dest_size = dest_size, |
ceb029cd | 3924 | .src = src, |
6994fd78 | 3925 | .src_size = src_size, |
e23c9d7a | 3926 | .func = func, |
ceb029cd VSO |
3927 | }; |
3928 | ||
3929 | while (s->nb_compress_threads >= MAX_COMPRESS_THREADS) { | |
3930 | qemu_co_queue_wait(&s->compress_wait_queue, NULL); | |
3931 | } | |
3932 | ||
3933 | s->nb_compress_threads++; | |
3934 | acb = thread_pool_submit_aio(pool, qcow2_compress_pool_func, &arg, | |
3935 | qcow2_compress_complete, | |
3936 | qemu_coroutine_self()); | |
3937 | ||
3938 | if (!acb) { | |
3939 | s->nb_compress_threads--; | |
3940 | return -EINVAL; | |
3941 | } | |
3942 | qemu_coroutine_yield(); | |
3943 | s->nb_compress_threads--; | |
3944 | qemu_co_queue_next(&s->compress_wait_queue); | |
3945 | ||
3946 | return arg.ret; | |
3947 | } | |
3948 | ||
e23c9d7a VSO |
3949 | static ssize_t coroutine_fn |
3950 | qcow2_co_compress(BlockDriverState *bs, void *dest, size_t dest_size, | |
3951 | const void *src, size_t src_size) | |
3952 | { | |
3953 | return qcow2_co_do_compress(bs, dest, dest_size, src, src_size, | |
3954 | qcow2_compress); | |
3955 | } | |
3956 | ||
3957 | static ssize_t coroutine_fn | |
3958 | qcow2_co_decompress(BlockDriverState *bs, void *dest, size_t dest_size, | |
3959 | const void *src, size_t src_size) | |
3960 | { | |
3961 | return qcow2_co_do_compress(bs, dest, dest_size, src, src_size, | |
3962 | qcow2_decompress); | |
3963 | } | |
3964 | ||
20d97356 BS |
3965 | /* XXX: put compressed sectors first, then all the cluster aligned |
3966 | tables to avoid losing bytes in alignment */ | |
fcccefc5 PB |
3967 | static coroutine_fn int |
3968 | qcow2_co_pwritev_compressed(BlockDriverState *bs, uint64_t offset, | |
3969 | uint64_t bytes, QEMUIOVector *qiov) | |
20d97356 | 3970 | { |
ff99129a | 3971 | BDRVQcow2State *s = bs->opaque; |
fcccefc5 | 3972 | QEMUIOVector hd_qiov; |
2714f13d VSO |
3973 | int ret; |
3974 | size_t out_len; | |
fcccefc5 | 3975 | uint8_t *buf, *out_buf; |
77e023ff | 3976 | uint64_t cluster_offset; |
20d97356 | 3977 | |
966b000f KW |
3978 | if (has_data_file(bs)) { |
3979 | return -ENOTSUP; | |
3980 | } | |
3981 | ||
fcccefc5 | 3982 | if (bytes == 0) { |
20d97356 BS |
3983 | /* align end of file to a sector boundary to ease reading with |
3984 | sector based I/Os */ | |
77e023ff KW |
3985 | int64_t len = bdrv_getlength(bs->file->bs); |
3986 | if (len < 0) { | |
3987 | return len; | |
d0d5d0e3 | 3988 | } |
77e023ff | 3989 | return bdrv_co_truncate(bs->file, len, PREALLOC_MODE_OFF, NULL); |
20d97356 BS |
3990 | } |
3991 | ||
3e3b838f AN |
3992 | if (offset_into_cluster(s, offset)) { |
3993 | return -EINVAL; | |
3994 | } | |
3995 | ||
a2c0ca6f | 3996 | buf = qemu_blockalign(bs, s->cluster_size); |
fcccefc5 | 3997 | if (bytes != s->cluster_size) { |
a2c0ca6f PB |
3998 | if (bytes > s->cluster_size || |
3999 | offset + bytes != bs->total_sectors << BDRV_SECTOR_BITS) | |
fcccefc5 | 4000 | { |
a2c0ca6f PB |
4001 | qemu_vfree(buf); |
4002 | return -EINVAL; | |
f4d38bef | 4003 | } |
a2c0ca6f PB |
4004 | /* Zero-pad last write if image size is not cluster aligned */ |
4005 | memset(buf + bytes, 0, s->cluster_size - bytes); | |
f4d38bef | 4006 | } |
8b2bd093 | 4007 | qemu_iovec_to_buf(qiov, 0, buf, bytes); |
20d97356 | 4008 | |
ebf7bba0 | 4009 | out_buf = g_malloc(s->cluster_size); |
20d97356 | 4010 | |
6994fd78 VSO |
4011 | out_len = qcow2_co_compress(bs, out_buf, s->cluster_size - 1, |
4012 | buf, s->cluster_size); | |
2714f13d | 4013 | if (out_len == -2) { |
8f1efd00 KW |
4014 | ret = -EINVAL; |
4015 | goto fail; | |
2714f13d | 4016 | } else if (out_len == -1) { |
20d97356 | 4017 | /* could not compress: write normal cluster */ |
fcccefc5 | 4018 | ret = qcow2_co_pwritev(bs, offset, bytes, qiov, 0); |
8f1efd00 KW |
4019 | if (ret < 0) { |
4020 | goto fail; | |
4021 | } | |
fcccefc5 PB |
4022 | goto success; |
4023 | } | |
cf93980e | 4024 | |
fcccefc5 | 4025 | qemu_co_mutex_lock(&s->lock); |
77e023ff KW |
4026 | ret = qcow2_alloc_compressed_cluster_offset(bs, offset, out_len, |
4027 | &cluster_offset); | |
4028 | if (ret < 0) { | |
fcccefc5 | 4029 | qemu_co_mutex_unlock(&s->lock); |
fcccefc5 PB |
4030 | goto fail; |
4031 | } | |
cf93980e | 4032 | |
966b000f | 4033 | ret = qcow2_pre_write_overlap_check(bs, 0, cluster_offset, out_len, true); |
fcccefc5 PB |
4034 | qemu_co_mutex_unlock(&s->lock); |
4035 | if (ret < 0) { | |
4036 | goto fail; | |
20d97356 BS |
4037 | } |
4038 | ||
c793d4ff | 4039 | qemu_iovec_init_buf(&hd_qiov, out_buf, out_len); |
fcccefc5 | 4040 | |
966b000f KW |
4041 | BLKDBG_EVENT(s->data_file, BLKDBG_WRITE_COMPRESSED); |
4042 | ret = bdrv_co_pwritev(s->data_file, cluster_offset, out_len, &hd_qiov, 0); | |
fcccefc5 PB |
4043 | if (ret < 0) { |
4044 | goto fail; | |
4045 | } | |
4046 | success: | |
8f1efd00 KW |
4047 | ret = 0; |
4048 | fail: | |
fcccefc5 | 4049 | qemu_vfree(buf); |
7267c094 | 4050 | g_free(out_buf); |
8f1efd00 | 4051 | return ret; |
20d97356 BS |
4052 | } |
4053 | ||
c3c10f72 VSO |
4054 | static int coroutine_fn |
4055 | qcow2_co_preadv_compressed(BlockDriverState *bs, | |
4056 | uint64_t file_cluster_offset, | |
4057 | uint64_t offset, | |
4058 | uint64_t bytes, | |
4059 | QEMUIOVector *qiov) | |
f4b3e2a9 VSO |
4060 | { |
4061 | BDRVQcow2State *s = bs->opaque; | |
c3c10f72 | 4062 | int ret = 0, csize, nb_csectors; |
f4b3e2a9 | 4063 | uint64_t coffset; |
c3c10f72 | 4064 | uint8_t *buf, *out_buf; |
c068a1cd | 4065 | QEMUIOVector local_qiov; |
c3c10f72 | 4066 | int offset_in_cluster = offset_into_cluster(s, offset); |
f4b3e2a9 | 4067 | |
c3c10f72 VSO |
4068 | coffset = file_cluster_offset & s->cluster_offset_mask; |
4069 | nb_csectors = ((file_cluster_offset >> s->csize_shift) & s->csize_mask) + 1; | |
4070 | csize = nb_csectors * 512 - (coffset & 511); | |
f4b3e2a9 | 4071 | |
c3c10f72 VSO |
4072 | buf = g_try_malloc(csize); |
4073 | if (!buf) { | |
4074 | return -ENOMEM; | |
4075 | } | |
c793d4ff | 4076 | qemu_iovec_init_buf(&local_qiov, buf, csize); |
f4b3e2a9 | 4077 | |
c3c10f72 | 4078 | out_buf = qemu_blockalign(bs, s->cluster_size); |
c068a1cd | 4079 | |
c3c10f72 VSO |
4080 | BLKDBG_EVENT(bs->file, BLKDBG_READ_COMPRESSED); |
4081 | ret = bdrv_co_preadv(bs->file, coffset, csize, &local_qiov, 0); | |
4082 | if (ret < 0) { | |
4083 | goto fail; | |
f4b3e2a9 | 4084 | } |
c3c10f72 | 4085 | |
e23c9d7a | 4086 | if (qcow2_co_decompress(bs, out_buf, s->cluster_size, buf, csize) < 0) { |
c3c10f72 VSO |
4087 | ret = -EIO; |
4088 | goto fail; | |
4089 | } | |
4090 | ||
4091 | qemu_iovec_from_buf(qiov, 0, out_buf + offset_in_cluster, bytes); | |
4092 | ||
4093 | fail: | |
4094 | qemu_vfree(out_buf); | |
4095 | g_free(buf); | |
4096 | ||
4097 | return ret; | |
f4b3e2a9 VSO |
4098 | } |
4099 | ||
94054183 HR |
4100 | static int make_completely_empty(BlockDriverState *bs) |
4101 | { | |
ff99129a | 4102 | BDRVQcow2State *s = bs->opaque; |
ed3d2ec9 | 4103 | Error *local_err = NULL; |
94054183 HR |
4104 | int ret, l1_clusters; |
4105 | int64_t offset; | |
4106 | uint64_t *new_reftable = NULL; | |
4107 | uint64_t rt_entry, l1_size2; | |
4108 | struct { | |
4109 | uint64_t l1_offset; | |
4110 | uint64_t reftable_offset; | |
4111 | uint32_t reftable_clusters; | |
4112 | } QEMU_PACKED l1_ofs_rt_ofs_cls; | |
4113 | ||
4114 | ret = qcow2_cache_empty(bs, s->l2_table_cache); | |
4115 | if (ret < 0) { | |
4116 | goto fail; | |
4117 | } | |
4118 | ||
4119 | ret = qcow2_cache_empty(bs, s->refcount_block_cache); | |
4120 | if (ret < 0) { | |
4121 | goto fail; | |
4122 | } | |
4123 | ||
4124 | /* Refcounts will be broken utterly */ | |
4125 | ret = qcow2_mark_dirty(bs); | |
4126 | if (ret < 0) { | |
4127 | goto fail; | |
4128 | } | |
4129 | ||
4130 | BLKDBG_EVENT(bs->file, BLKDBG_L1_UPDATE); | |
4131 | ||
4132 | l1_clusters = DIV_ROUND_UP(s->l1_size, s->cluster_size / sizeof(uint64_t)); | |
4133 | l1_size2 = (uint64_t)s->l1_size * sizeof(uint64_t); | |
4134 | ||
4135 | /* After this call, neither the in-memory nor the on-disk refcount | |
4136 | * information accurately describe the actual references */ | |
4137 | ||
720ff280 | 4138 | ret = bdrv_pwrite_zeroes(bs->file, s->l1_table_offset, |
74021bc4 | 4139 | l1_clusters * s->cluster_size, 0); |
94054183 HR |
4140 | if (ret < 0) { |
4141 | goto fail_broken_refcounts; | |
4142 | } | |
4143 | memset(s->l1_table, 0, l1_size2); | |
4144 | ||
4145 | BLKDBG_EVENT(bs->file, BLKDBG_EMPTY_IMAGE_PREPARE); | |
4146 | ||
4147 | /* Overwrite enough clusters at the beginning of the sectors to place | |
4148 | * the refcount table, a refcount block and the L1 table in; this may | |
4149 | * overwrite parts of the existing refcount and L1 table, which is not | |
4150 | * an issue because the dirty flag is set, complete data loss is in fact | |
4151 | * desired and partial data loss is consequently fine as well */ | |
720ff280 | 4152 | ret = bdrv_pwrite_zeroes(bs->file, s->cluster_size, |
74021bc4 | 4153 | (2 + l1_clusters) * s->cluster_size, 0); |
94054183 HR |
4154 | /* This call (even if it failed overall) may have overwritten on-disk |
4155 | * refcount structures; in that case, the in-memory refcount information | |
4156 | * will probably differ from the on-disk information which makes the BDS | |
4157 | * unusable */ | |
4158 | if (ret < 0) { | |
4159 | goto fail_broken_refcounts; | |
4160 | } | |
4161 | ||
4162 | BLKDBG_EVENT(bs->file, BLKDBG_L1_UPDATE); | |
4163 | BLKDBG_EVENT(bs->file, BLKDBG_REFTABLE_UPDATE); | |
4164 | ||
4165 | /* "Create" an empty reftable (one cluster) directly after the image | |
4166 | * header and an empty L1 table three clusters after the image header; | |
4167 | * the cluster between those two will be used as the first refblock */ | |
f1f7a1dd PM |
4168 | l1_ofs_rt_ofs_cls.l1_offset = cpu_to_be64(3 * s->cluster_size); |
4169 | l1_ofs_rt_ofs_cls.reftable_offset = cpu_to_be64(s->cluster_size); | |
4170 | l1_ofs_rt_ofs_cls.reftable_clusters = cpu_to_be32(1); | |
d9ca2ea2 | 4171 | ret = bdrv_pwrite_sync(bs->file, offsetof(QCowHeader, l1_table_offset), |
94054183 HR |
4172 | &l1_ofs_rt_ofs_cls, sizeof(l1_ofs_rt_ofs_cls)); |
4173 | if (ret < 0) { | |
4174 | goto fail_broken_refcounts; | |
4175 | } | |
4176 | ||
4177 | s->l1_table_offset = 3 * s->cluster_size; | |
4178 | ||
4179 | new_reftable = g_try_new0(uint64_t, s->cluster_size / sizeof(uint64_t)); | |
4180 | if (!new_reftable) { | |
4181 | ret = -ENOMEM; | |
4182 | goto fail_broken_refcounts; | |
4183 | } | |
4184 | ||
4185 | s->refcount_table_offset = s->cluster_size; | |
4186 | s->refcount_table_size = s->cluster_size / sizeof(uint64_t); | |
7061a078 | 4187 | s->max_refcount_table_index = 0; |
94054183 HR |
4188 | |
4189 | g_free(s->refcount_table); | |
4190 | s->refcount_table = new_reftable; | |
4191 | new_reftable = NULL; | |
4192 | ||
4193 | /* Now the in-memory refcount information again corresponds to the on-disk | |
4194 | * information (reftable is empty and no refblocks (the refblock cache is | |
4195 | * empty)); however, this means some clusters (e.g. the image header) are | |
4196 | * referenced, but not refcounted, but the normal qcow2 code assumes that | |
4197 | * the in-memory information is always correct */ | |
4198 | ||
4199 | BLKDBG_EVENT(bs->file, BLKDBG_REFBLOCK_ALLOC); | |
4200 | ||
4201 | /* Enter the first refblock into the reftable */ | |
4202 | rt_entry = cpu_to_be64(2 * s->cluster_size); | |
d9ca2ea2 | 4203 | ret = bdrv_pwrite_sync(bs->file, s->cluster_size, |
94054183 HR |
4204 | &rt_entry, sizeof(rt_entry)); |
4205 | if (ret < 0) { | |
4206 | goto fail_broken_refcounts; | |
4207 | } | |
4208 | s->refcount_table[0] = 2 * s->cluster_size; | |
4209 | ||
4210 | s->free_cluster_index = 0; | |
4211 | assert(3 + l1_clusters <= s->refcount_block_size); | |
4212 | offset = qcow2_alloc_clusters(bs, 3 * s->cluster_size + l1_size2); | |
4213 | if (offset < 0) { | |
4214 | ret = offset; | |
4215 | goto fail_broken_refcounts; | |
4216 | } else if (offset > 0) { | |
4217 | error_report("First cluster in emptied image is in use"); | |
4218 | abort(); | |
4219 | } | |
4220 | ||
4221 | /* Now finally the in-memory information corresponds to the on-disk | |
4222 | * structures and is correct */ | |
4223 | ret = qcow2_mark_clean(bs); | |
4224 | if (ret < 0) { | |
4225 | goto fail; | |
4226 | } | |
4227 | ||
ed3d2ec9 | 4228 | ret = bdrv_truncate(bs->file, (3 + l1_clusters) * s->cluster_size, |
7ea37c30 | 4229 | PREALLOC_MODE_OFF, &local_err); |
94054183 | 4230 | if (ret < 0) { |
ed3d2ec9 | 4231 | error_report_err(local_err); |
94054183 HR |
4232 | goto fail; |
4233 | } | |
4234 | ||
4235 | return 0; | |
4236 | ||
4237 | fail_broken_refcounts: | |
4238 | /* The BDS is unusable at this point. If we wanted to make it usable, we | |
4239 | * would have to call qcow2_refcount_close(), qcow2_refcount_init(), | |
4240 | * qcow2_check_refcounts(), qcow2_refcount_close() and qcow2_refcount_init() | |
4241 | * again. However, because the functions which could have caused this error | |
4242 | * path to be taken are used by those functions as well, it's very likely | |
4243 | * that that sequence will fail as well. Therefore, just eject the BDS. */ | |
4244 | bs->drv = NULL; | |
4245 | ||
4246 | fail: | |
4247 | g_free(new_reftable); | |
4248 | return ret; | |
4249 | } | |
4250 | ||
491d27e2 HR |
4251 | static int qcow2_make_empty(BlockDriverState *bs) |
4252 | { | |
ff99129a | 4253 | BDRVQcow2State *s = bs->opaque; |
d2cb36af EB |
4254 | uint64_t offset, end_offset; |
4255 | int step = QEMU_ALIGN_DOWN(INT_MAX, s->cluster_size); | |
94054183 HR |
4256 | int l1_clusters, ret = 0; |
4257 | ||
4258 | l1_clusters = DIV_ROUND_UP(s->l1_size, s->cluster_size / sizeof(uint64_t)); | |
4259 | ||
4096974e | 4260 | if (s->qcow_version >= 3 && !s->snapshots && !s->nb_bitmaps && |
f0603329 DB |
4261 | 3 + l1_clusters <= s->refcount_block_size && |
4262 | s->crypt_method_header != QCOW_CRYPT_LUKS) { | |
4096974e EB |
4263 | /* The following function only works for qcow2 v3 images (it |
4264 | * requires the dirty flag) and only as long as there are no | |
4265 | * features that reserve extra clusters (such as snapshots, | |
4266 | * LUKS header, or persistent bitmaps), because it completely | |
4267 | * empties the image. Furthermore, the L1 table and three | |
4268 | * additional clusters (image header, refcount table, one | |
4269 | * refcount block) have to fit inside one refcount block. */ | |
94054183 HR |
4270 | return make_completely_empty(bs); |
4271 | } | |
491d27e2 | 4272 | |
94054183 HR |
4273 | /* This fallback code simply discards every active cluster; this is slow, |
4274 | * but works in all cases */ | |
d2cb36af EB |
4275 | end_offset = bs->total_sectors * BDRV_SECTOR_SIZE; |
4276 | for (offset = 0; offset < end_offset; offset += step) { | |
491d27e2 HR |
4277 | /* As this function is generally used after committing an external |
4278 | * snapshot, QCOW2_DISCARD_SNAPSHOT seems appropriate. Also, the | |
4279 | * default action for this kind of discard is to pass the discard, | |
4280 | * which will ideally result in an actually smaller image file, as | |
4281 | * is probably desired. */ | |
d2cb36af EB |
4282 | ret = qcow2_cluster_discard(bs, offset, MIN(step, end_offset - offset), |
4283 | QCOW2_DISCARD_SNAPSHOT, true); | |
491d27e2 HR |
4284 | if (ret < 0) { |
4285 | break; | |
4286 | } | |
4287 | } | |
4288 | ||
4289 | return ret; | |
4290 | } | |
4291 | ||
a968168c | 4292 | static coroutine_fn int qcow2_co_flush_to_os(BlockDriverState *bs) |
20d97356 | 4293 | { |
ff99129a | 4294 | BDRVQcow2State *s = bs->opaque; |
29c1a730 KW |
4295 | int ret; |
4296 | ||
8b94ff85 | 4297 | qemu_co_mutex_lock(&s->lock); |
8b220eb7 | 4298 | ret = qcow2_write_caches(bs); |
8b94ff85 | 4299 | qemu_co_mutex_unlock(&s->lock); |
29c1a730 | 4300 | |
8b220eb7 | 4301 | return ret; |
eb489bb1 KW |
4302 | } |
4303 | ||
61914f89 SH |
4304 | static ssize_t qcow2_measure_crypto_hdr_init_func(QCryptoBlock *block, |
4305 | size_t headerlen, void *opaque, Error **errp) | |
4306 | { | |
4307 | size_t *headerlenp = opaque; | |
4308 | ||
4309 | /* Stash away the payload size */ | |
4310 | *headerlenp = headerlen; | |
4311 | return 0; | |
4312 | } | |
4313 | ||
4314 | static ssize_t qcow2_measure_crypto_hdr_write_func(QCryptoBlock *block, | |
4315 | size_t offset, const uint8_t *buf, size_t buflen, | |
4316 | void *opaque, Error **errp) | |
4317 | { | |
4318 | /* Discard the bytes, we're not actually writing to an image */ | |
4319 | return buflen; | |
4320 | } | |
4321 | ||
4322 | /* Determine the number of bytes for the LUKS payload */ | |
4323 | static bool qcow2_measure_luks_headerlen(QemuOpts *opts, size_t *len, | |
4324 | Error **errp) | |
4325 | { | |
4326 | QDict *opts_qdict; | |
4327 | QDict *cryptoopts_qdict; | |
4328 | QCryptoBlockCreateOptions *cryptoopts; | |
4329 | QCryptoBlock *crypto; | |
4330 | ||
4331 | /* Extract "encrypt." options into a qdict */ | |
4332 | opts_qdict = qemu_opts_to_qdict(opts, NULL); | |
4333 | qdict_extract_subqdict(opts_qdict, &cryptoopts_qdict, "encrypt."); | |
4334 | qobject_unref(opts_qdict); | |
4335 | ||
4336 | /* Build QCryptoBlockCreateOptions object from qdict */ | |
4337 | qdict_put_str(cryptoopts_qdict, "format", "luks"); | |
4338 | cryptoopts = block_crypto_create_opts_init(cryptoopts_qdict, errp); | |
4339 | qobject_unref(cryptoopts_qdict); | |
4340 | if (!cryptoopts) { | |
4341 | return false; | |
4342 | } | |
4343 | ||
4344 | /* Fake LUKS creation in order to determine the payload size */ | |
4345 | crypto = qcrypto_block_create(cryptoopts, "encrypt.", | |
4346 | qcow2_measure_crypto_hdr_init_func, | |
4347 | qcow2_measure_crypto_hdr_write_func, | |
4348 | len, errp); | |
4349 | qapi_free_QCryptoBlockCreateOptions(cryptoopts); | |
4350 | if (!crypto) { | |
4351 | return false; | |
4352 | } | |
4353 | ||
4354 | qcrypto_block_free(crypto); | |
4355 | return true; | |
4356 | } | |
4357 | ||
c501c352 SH |
4358 | static BlockMeasureInfo *qcow2_measure(QemuOpts *opts, BlockDriverState *in_bs, |
4359 | Error **errp) | |
4360 | { | |
4361 | Error *local_err = NULL; | |
4362 | BlockMeasureInfo *info; | |
4363 | uint64_t required = 0; /* bytes that contribute to required size */ | |
4364 | uint64_t virtual_size; /* disk size as seen by guest */ | |
4365 | uint64_t refcount_bits; | |
4366 | uint64_t l2_tables; | |
61914f89 | 4367 | uint64_t luks_payload_size = 0; |
c501c352 SH |
4368 | size_t cluster_size; |
4369 | int version; | |
4370 | char *optstr; | |
4371 | PreallocMode prealloc; | |
4372 | bool has_backing_file; | |
61914f89 | 4373 | bool has_luks; |
c501c352 SH |
4374 | |
4375 | /* Parse image creation options */ | |
4376 | cluster_size = qcow2_opt_get_cluster_size_del(opts, &local_err); | |
4377 | if (local_err) { | |
4378 | goto err; | |
4379 | } | |
4380 | ||
4381 | version = qcow2_opt_get_version_del(opts, &local_err); | |
4382 | if (local_err) { | |
4383 | goto err; | |
4384 | } | |
4385 | ||
4386 | refcount_bits = qcow2_opt_get_refcount_bits_del(opts, version, &local_err); | |
4387 | if (local_err) { | |
4388 | goto err; | |
4389 | } | |
4390 | ||
4391 | optstr = qemu_opt_get_del(opts, BLOCK_OPT_PREALLOC); | |
f7abe0ec | 4392 | prealloc = qapi_enum_parse(&PreallocMode_lookup, optstr, |
06c60b6c | 4393 | PREALLOC_MODE_OFF, &local_err); |
c501c352 SH |
4394 | g_free(optstr); |
4395 | if (local_err) { | |
4396 | goto err; | |
4397 | } | |
4398 | ||
4399 | optstr = qemu_opt_get_del(opts, BLOCK_OPT_BACKING_FILE); | |
4400 | has_backing_file = !!optstr; | |
4401 | g_free(optstr); | |
4402 | ||
61914f89 SH |
4403 | optstr = qemu_opt_get_del(opts, BLOCK_OPT_ENCRYPT_FORMAT); |
4404 | has_luks = optstr && strcmp(optstr, "luks") == 0; | |
4405 | g_free(optstr); | |
4406 | ||
4407 | if (has_luks) { | |
4408 | size_t headerlen; | |
4409 | ||
4410 | if (!qcow2_measure_luks_headerlen(opts, &headerlen, &local_err)) { | |
4411 | goto err; | |
4412 | } | |
4413 | ||
4414 | luks_payload_size = ROUND_UP(headerlen, cluster_size); | |
4415 | } | |
4416 | ||
9e029689 AG |
4417 | virtual_size = qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0); |
4418 | virtual_size = ROUND_UP(virtual_size, cluster_size); | |
c501c352 SH |
4419 | |
4420 | /* Check that virtual disk size is valid */ | |
4421 | l2_tables = DIV_ROUND_UP(virtual_size / cluster_size, | |
4422 | cluster_size / sizeof(uint64_t)); | |
4423 | if (l2_tables * sizeof(uint64_t) > QCOW_MAX_L1_SIZE) { | |
4424 | error_setg(&local_err, "The image size is too large " | |
4425 | "(try using a larger cluster size)"); | |
4426 | goto err; | |
4427 | } | |
4428 | ||
4429 | /* Account for input image */ | |
4430 | if (in_bs) { | |
4431 | int64_t ssize = bdrv_getlength(in_bs); | |
4432 | if (ssize < 0) { | |
4433 | error_setg_errno(&local_err, -ssize, | |
4434 | "Unable to get image virtual_size"); | |
4435 | goto err; | |
4436 | } | |
4437 | ||
9e029689 | 4438 | virtual_size = ROUND_UP(ssize, cluster_size); |
c501c352 SH |
4439 | |
4440 | if (has_backing_file) { | |
4441 | /* We don't how much of the backing chain is shared by the input | |
4442 | * image and the new image file. In the worst case the new image's | |
4443 | * backing file has nothing in common with the input image. Be | |
4444 | * conservative and assume all clusters need to be written. | |
4445 | */ | |
4446 | required = virtual_size; | |
4447 | } else { | |
b85ee453 | 4448 | int64_t offset; |
31826642 | 4449 | int64_t pnum = 0; |
c501c352 | 4450 | |
31826642 EB |
4451 | for (offset = 0; offset < ssize; offset += pnum) { |
4452 | int ret; | |
c501c352 | 4453 | |
31826642 EB |
4454 | ret = bdrv_block_status_above(in_bs, NULL, offset, |
4455 | ssize - offset, &pnum, NULL, | |
4456 | NULL); | |
c501c352 SH |
4457 | if (ret < 0) { |
4458 | error_setg_errno(&local_err, -ret, | |
4459 | "Unable to get block status"); | |
4460 | goto err; | |
4461 | } | |
4462 | ||
4463 | if (ret & BDRV_BLOCK_ZERO) { | |
4464 | /* Skip zero regions (safe with no backing file) */ | |
4465 | } else if ((ret & (BDRV_BLOCK_DATA | BDRV_BLOCK_ALLOCATED)) == | |
4466 | (BDRV_BLOCK_DATA | BDRV_BLOCK_ALLOCATED)) { | |
4467 | /* Extend pnum to end of cluster for next iteration */ | |
31826642 | 4468 | pnum = ROUND_UP(offset + pnum, cluster_size) - offset; |
c501c352 SH |
4469 | |
4470 | /* Count clusters we've seen */ | |
31826642 | 4471 | required += offset % cluster_size + pnum; |
c501c352 SH |
4472 | } |
4473 | } | |
4474 | } | |
4475 | } | |
4476 | ||
4477 | /* Take into account preallocation. Nothing special is needed for | |
4478 | * PREALLOC_MODE_METADATA since metadata is always counted. | |
4479 | */ | |
4480 | if (prealloc == PREALLOC_MODE_FULL || prealloc == PREALLOC_MODE_FALLOC) { | |
4481 | required = virtual_size; | |
4482 | } | |
4483 | ||
4484 | info = g_new(BlockMeasureInfo, 1); | |
4485 | info->fully_allocated = | |
4486 | qcow2_calc_prealloc_size(virtual_size, cluster_size, | |
61914f89 | 4487 | ctz32(refcount_bits)) + luks_payload_size; |
c501c352 SH |
4488 | |
4489 | /* Remove data clusters that are not required. This overestimates the | |
4490 | * required size because metadata needed for the fully allocated file is | |
4491 | * still counted. | |
4492 | */ | |
4493 | info->required = info->fully_allocated - virtual_size + required; | |
4494 | return info; | |
4495 | ||
4496 | err: | |
4497 | error_propagate(errp, local_err); | |
4498 | return NULL; | |
4499 | } | |
4500 | ||
7c80ab3f | 4501 | static int qcow2_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
20d97356 | 4502 | { |
ff99129a | 4503 | BDRVQcow2State *s = bs->opaque; |
95de6d70 | 4504 | bdi->unallocated_blocks_are_zero = true; |
20d97356 | 4505 | bdi->cluster_size = s->cluster_size; |
7c80ab3f | 4506 | bdi->vm_state_offset = qcow2_vm_state_offset(s); |
20d97356 BS |
4507 | return 0; |
4508 | } | |
4509 | ||
1bf6e9ca AS |
4510 | static ImageInfoSpecific *qcow2_get_specific_info(BlockDriverState *bs, |
4511 | Error **errp) | |
37764dfb | 4512 | { |
ff99129a | 4513 | BDRVQcow2State *s = bs->opaque; |
0a12f6f8 DB |
4514 | ImageInfoSpecific *spec_info; |
4515 | QCryptoBlockInfo *encrypt_info = NULL; | |
1bf6e9ca | 4516 | Error *local_err = NULL; |
37764dfb | 4517 | |
0a12f6f8 | 4518 | if (s->crypto != NULL) { |
1bf6e9ca AS |
4519 | encrypt_info = qcrypto_block_get_info(s->crypto, &local_err); |
4520 | if (local_err) { | |
4521 | error_propagate(errp, local_err); | |
4522 | return NULL; | |
4523 | } | |
0a12f6f8 DB |
4524 | } |
4525 | ||
4526 | spec_info = g_new(ImageInfoSpecific, 1); | |
37764dfb | 4527 | *spec_info = (ImageInfoSpecific){ |
6a8f9661 | 4528 | .type = IMAGE_INFO_SPECIFIC_KIND_QCOW2, |
b8968c87 | 4529 | .u.qcow2.data = g_new0(ImageInfoSpecificQCow2, 1), |
37764dfb HR |
4530 | }; |
4531 | if (s->qcow_version == 2) { | |
32bafa8f | 4532 | *spec_info->u.qcow2.data = (ImageInfoSpecificQCow2){ |
0709c5a1 HR |
4533 | .compat = g_strdup("0.10"), |
4534 | .refcount_bits = s->refcount_bits, | |
37764dfb HR |
4535 | }; |
4536 | } else if (s->qcow_version == 3) { | |
b8968c87 AS |
4537 | Qcow2BitmapInfoList *bitmaps; |
4538 | bitmaps = qcow2_get_bitmap_info_list(bs, &local_err); | |
4539 | if (local_err) { | |
4540 | error_propagate(errp, local_err); | |
4541 | qapi_free_ImageInfoSpecific(spec_info); | |
4542 | return NULL; | |
4543 | } | |
32bafa8f | 4544 | *spec_info->u.qcow2.data = (ImageInfoSpecificQCow2){ |
37764dfb HR |
4545 | .compat = g_strdup("1.1"), |
4546 | .lazy_refcounts = s->compatible_features & | |
4547 | QCOW2_COMPAT_LAZY_REFCOUNTS, | |
4548 | .has_lazy_refcounts = true, | |
9009b196 HR |
4549 | .corrupt = s->incompatible_features & |
4550 | QCOW2_INCOMPAT_CORRUPT, | |
4551 | .has_corrupt = true, | |
0709c5a1 | 4552 | .refcount_bits = s->refcount_bits, |
b8968c87 AS |
4553 | .has_bitmaps = !!bitmaps, |
4554 | .bitmaps = bitmaps, | |
37764dfb | 4555 | }; |
b1fc8f93 DL |
4556 | } else { |
4557 | /* if this assertion fails, this probably means a new version was | |
4558 | * added without having it covered here */ | |
4559 | assert(false); | |
37764dfb HR |
4560 | } |
4561 | ||
0a12f6f8 DB |
4562 | if (encrypt_info) { |
4563 | ImageInfoSpecificQCow2Encryption *qencrypt = | |
4564 | g_new(ImageInfoSpecificQCow2Encryption, 1); | |
4565 | switch (encrypt_info->format) { | |
4566 | case Q_CRYPTO_BLOCK_FORMAT_QCOW: | |
4567 | qencrypt->format = BLOCKDEV_QCOW2_ENCRYPTION_FORMAT_AES; | |
0a12f6f8 DB |
4568 | break; |
4569 | case Q_CRYPTO_BLOCK_FORMAT_LUKS: | |
4570 | qencrypt->format = BLOCKDEV_QCOW2_ENCRYPTION_FORMAT_LUKS; | |
4571 | qencrypt->u.luks = encrypt_info->u.luks; | |
4572 | break; | |
4573 | default: | |
4574 | abort(); | |
4575 | } | |
4576 | /* Since we did shallow copy above, erase any pointers | |
4577 | * in the original info */ | |
4578 | memset(&encrypt_info->u, 0, sizeof(encrypt_info->u)); | |
4579 | qapi_free_QCryptoBlockInfo(encrypt_info); | |
4580 | ||
4581 | spec_info->u.qcow2.data->has_encrypt = true; | |
4582 | spec_info->u.qcow2.data->encrypt = qencrypt; | |
4583 | } | |
4584 | ||
37764dfb HR |
4585 | return spec_info; |
4586 | } | |
4587 | ||
cf8074b3 KW |
4588 | static int qcow2_save_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, |
4589 | int64_t pos) | |
20d97356 | 4590 | { |
ff99129a | 4591 | BDRVQcow2State *s = bs->opaque; |
20d97356 | 4592 | |
66f82cee | 4593 | BLKDBG_EVENT(bs->file, BLKDBG_VMSTATE_SAVE); |
734a7758 KW |
4594 | return bs->drv->bdrv_co_pwritev(bs, qcow2_vm_state_offset(s) + pos, |
4595 | qiov->size, qiov, 0); | |
20d97356 BS |
4596 | } |
4597 | ||
5ddda0b8 KW |
4598 | static int qcow2_load_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, |
4599 | int64_t pos) | |
20d97356 | 4600 | { |
ff99129a | 4601 | BDRVQcow2State *s = bs->opaque; |
20d97356 | 4602 | |
66f82cee | 4603 | BLKDBG_EVENT(bs->file, BLKDBG_VMSTATE_LOAD); |
734a7758 KW |
4604 | return bs->drv->bdrv_co_preadv(bs, qcow2_vm_state_offset(s) + pos, |
4605 | qiov->size, qiov, 0); | |
20d97356 BS |
4606 | } |
4607 | ||
9296b3ed HR |
4608 | /* |
4609 | * Downgrades an image's version. To achieve this, any incompatible features | |
4610 | * have to be removed. | |
4611 | */ | |
4057a2b2 | 4612 | static int qcow2_downgrade(BlockDriverState *bs, int target_version, |
d1402b50 HR |
4613 | BlockDriverAmendStatusCB *status_cb, void *cb_opaque, |
4614 | Error **errp) | |
9296b3ed | 4615 | { |
ff99129a | 4616 | BDRVQcow2State *s = bs->opaque; |
9296b3ed HR |
4617 | int current_version = s->qcow_version; |
4618 | int ret; | |
4619 | ||
d1402b50 HR |
4620 | /* This is qcow2_downgrade(), not qcow2_upgrade() */ |
4621 | assert(target_version < current_version); | |
4622 | ||
4623 | /* There are no other versions (now) that you can downgrade to */ | |
4624 | assert(target_version == 2); | |
9296b3ed HR |
4625 | |
4626 | if (s->refcount_order != 4) { | |
d1402b50 | 4627 | error_setg(errp, "compat=0.10 requires refcount_bits=16"); |
9296b3ed HR |
4628 | return -ENOTSUP; |
4629 | } | |
4630 | ||
966b000f KW |
4631 | if (has_data_file(bs)) { |
4632 | error_setg(errp, "Cannot downgrade an image with a data file"); | |
4633 | return -ENOTSUP; | |
4634 | } | |
4635 | ||
9296b3ed HR |
4636 | /* clear incompatible features */ |
4637 | if (s->incompatible_features & QCOW2_INCOMPAT_DIRTY) { | |
4638 | ret = qcow2_mark_clean(bs); | |
4639 | if (ret < 0) { | |
d1402b50 | 4640 | error_setg_errno(errp, -ret, "Failed to make the image clean"); |
9296b3ed HR |
4641 | return ret; |
4642 | } | |
4643 | } | |
4644 | ||
4645 | /* with QCOW2_INCOMPAT_CORRUPT, it is pretty much impossible to get here in | |
4646 | * the first place; if that happens nonetheless, returning -ENOTSUP is the | |
4647 | * best thing to do anyway */ | |
4648 | ||
4649 | if (s->incompatible_features) { | |
d1402b50 HR |
4650 | error_setg(errp, "Cannot downgrade an image with incompatible features " |
4651 | "%#" PRIx64 " set", s->incompatible_features); | |
9296b3ed HR |
4652 | return -ENOTSUP; |
4653 | } | |
4654 | ||
4655 | /* since we can ignore compatible features, we can set them to 0 as well */ | |
4656 | s->compatible_features = 0; | |
4657 | /* if lazy refcounts have been used, they have already been fixed through | |
4658 | * clearing the dirty flag */ | |
4659 | ||
4660 | /* clearing autoclear features is trivial */ | |
4661 | s->autoclear_features = 0; | |
4662 | ||
8b13976d | 4663 | ret = qcow2_expand_zero_clusters(bs, status_cb, cb_opaque); |
9296b3ed | 4664 | if (ret < 0) { |
d1402b50 | 4665 | error_setg_errno(errp, -ret, "Failed to turn zero into data clusters"); |
9296b3ed HR |
4666 | return ret; |
4667 | } | |
4668 | ||
4669 | s->qcow_version = target_version; | |
4670 | ret = qcow2_update_header(bs); | |
4671 | if (ret < 0) { | |
4672 | s->qcow_version = current_version; | |
d1402b50 | 4673 | error_setg_errno(errp, -ret, "Failed to update the image header"); |
9296b3ed HR |
4674 | return ret; |
4675 | } | |
4676 | return 0; | |
4677 | } | |
4678 | ||
c293a809 HR |
4679 | typedef enum Qcow2AmendOperation { |
4680 | /* This is the value Qcow2AmendHelperCBInfo::last_operation will be | |
4681 | * statically initialized to so that the helper CB can discern the first | |
4682 | * invocation from an operation change */ | |
4683 | QCOW2_NO_OPERATION = 0, | |
4684 | ||
61ce55fc | 4685 | QCOW2_CHANGING_REFCOUNT_ORDER, |
c293a809 HR |
4686 | QCOW2_DOWNGRADING, |
4687 | } Qcow2AmendOperation; | |
4688 | ||
4689 | typedef struct Qcow2AmendHelperCBInfo { | |
4690 | /* The code coordinating the amend operations should only modify | |
4691 | * these four fields; the rest will be managed by the CB */ | |
4692 | BlockDriverAmendStatusCB *original_status_cb; | |
4693 | void *original_cb_opaque; | |
4694 | ||
4695 | Qcow2AmendOperation current_operation; | |
4696 | ||
4697 | /* Total number of operations to perform (only set once) */ | |
4698 | int total_operations; | |
4699 | ||
4700 | /* The following fields are managed by the CB */ | |
4701 | ||
4702 | /* Number of operations completed */ | |
4703 | int operations_completed; | |
4704 | ||
4705 | /* Cumulative offset of all completed operations */ | |
4706 | int64_t offset_completed; | |
4707 | ||
4708 | Qcow2AmendOperation last_operation; | |
4709 | int64_t last_work_size; | |
4710 | } Qcow2AmendHelperCBInfo; | |
4711 | ||
4712 | static void qcow2_amend_helper_cb(BlockDriverState *bs, | |
4713 | int64_t operation_offset, | |
4714 | int64_t operation_work_size, void *opaque) | |
4715 | { | |
4716 | Qcow2AmendHelperCBInfo *info = opaque; | |
4717 | int64_t current_work_size; | |
4718 | int64_t projected_work_size; | |
4719 | ||
4720 | if (info->current_operation != info->last_operation) { | |
4721 | if (info->last_operation != QCOW2_NO_OPERATION) { | |
4722 | info->offset_completed += info->last_work_size; | |
4723 | info->operations_completed++; | |
4724 | } | |
4725 | ||
4726 | info->last_operation = info->current_operation; | |
4727 | } | |
4728 | ||
4729 | assert(info->total_operations > 0); | |
4730 | assert(info->operations_completed < info->total_operations); | |
4731 | ||
4732 | info->last_work_size = operation_work_size; | |
4733 | ||
4734 | current_work_size = info->offset_completed + operation_work_size; | |
4735 | ||
4736 | /* current_work_size is the total work size for (operations_completed + 1) | |
4737 | * operations (which includes this one), so multiply it by the number of | |
4738 | * operations not covered and divide it by the number of operations | |
4739 | * covered to get a projection for the operations not covered */ | |
4740 | projected_work_size = current_work_size * (info->total_operations - | |
4741 | info->operations_completed - 1) | |
4742 | / (info->operations_completed + 1); | |
4743 | ||
4744 | info->original_status_cb(bs, info->offset_completed + operation_offset, | |
4745 | current_work_size + projected_work_size, | |
4746 | info->original_cb_opaque); | |
4747 | } | |
4748 | ||
77485434 | 4749 | static int qcow2_amend_options(BlockDriverState *bs, QemuOpts *opts, |
8b13976d | 4750 | BlockDriverAmendStatusCB *status_cb, |
d1402b50 HR |
4751 | void *cb_opaque, |
4752 | Error **errp) | |
9296b3ed | 4753 | { |
ff99129a | 4754 | BDRVQcow2State *s = bs->opaque; |
9296b3ed HR |
4755 | int old_version = s->qcow_version, new_version = old_version; |
4756 | uint64_t new_size = 0; | |
4757 | const char *backing_file = NULL, *backing_format = NULL; | |
4758 | bool lazy_refcounts = s->use_lazy_refcounts; | |
1bd0e2d1 CL |
4759 | const char *compat = NULL; |
4760 | uint64_t cluster_size = s->cluster_size; | |
4761 | bool encrypt; | |
4652b8f3 | 4762 | int encformat; |
61ce55fc | 4763 | int refcount_bits = s->refcount_bits; |
9296b3ed | 4764 | int ret; |
1bd0e2d1 | 4765 | QemuOptDesc *desc = opts->list->desc; |
c293a809 | 4766 | Qcow2AmendHelperCBInfo helper_cb_info; |
9296b3ed | 4767 | |
1bd0e2d1 CL |
4768 | while (desc && desc->name) { |
4769 | if (!qemu_opt_find(opts, desc->name)) { | |
9296b3ed | 4770 | /* only change explicitly defined options */ |
1bd0e2d1 | 4771 | desc++; |
9296b3ed HR |
4772 | continue; |
4773 | } | |
4774 | ||
8a17b83c HR |
4775 | if (!strcmp(desc->name, BLOCK_OPT_COMPAT_LEVEL)) { |
4776 | compat = qemu_opt_get(opts, BLOCK_OPT_COMPAT_LEVEL); | |
1bd0e2d1 | 4777 | if (!compat) { |
9296b3ed | 4778 | /* preserve default */ |
1bd0e2d1 | 4779 | } else if (!strcmp(compat, "0.10")) { |
9296b3ed | 4780 | new_version = 2; |
1bd0e2d1 | 4781 | } else if (!strcmp(compat, "1.1")) { |
9296b3ed HR |
4782 | new_version = 3; |
4783 | } else { | |
d1402b50 | 4784 | error_setg(errp, "Unknown compatibility level %s", compat); |
9296b3ed HR |
4785 | return -EINVAL; |
4786 | } | |
8a17b83c | 4787 | } else if (!strcmp(desc->name, BLOCK_OPT_PREALLOC)) { |
d1402b50 | 4788 | error_setg(errp, "Cannot change preallocation mode"); |
9296b3ed | 4789 | return -ENOTSUP; |
8a17b83c HR |
4790 | } else if (!strcmp(desc->name, BLOCK_OPT_SIZE)) { |
4791 | new_size = qemu_opt_get_size(opts, BLOCK_OPT_SIZE, 0); | |
4792 | } else if (!strcmp(desc->name, BLOCK_OPT_BACKING_FILE)) { | |
4793 | backing_file = qemu_opt_get(opts, BLOCK_OPT_BACKING_FILE); | |
4794 | } else if (!strcmp(desc->name, BLOCK_OPT_BACKING_FMT)) { | |
4795 | backing_format = qemu_opt_get(opts, BLOCK_OPT_BACKING_FMT); | |
4796 | } else if (!strcmp(desc->name, BLOCK_OPT_ENCRYPT)) { | |
4797 | encrypt = qemu_opt_get_bool(opts, BLOCK_OPT_ENCRYPT, | |
b25b387f | 4798 | !!s->crypto); |
f6fa64f6 | 4799 | |
b25b387f | 4800 | if (encrypt != !!s->crypto) { |
d1402b50 HR |
4801 | error_setg(errp, |
4802 | "Changing the encryption flag is not supported"); | |
9296b3ed HR |
4803 | return -ENOTSUP; |
4804 | } | |
4652b8f3 DB |
4805 | } else if (!strcmp(desc->name, BLOCK_OPT_ENCRYPT_FORMAT)) { |
4806 | encformat = qcow2_crypt_method_from_format( | |
4807 | qemu_opt_get(opts, BLOCK_OPT_ENCRYPT_FORMAT)); | |
4808 | ||
4809 | if (encformat != s->crypt_method_header) { | |
d1402b50 HR |
4810 | error_setg(errp, |
4811 | "Changing the encryption format is not supported"); | |
4652b8f3 DB |
4812 | return -ENOTSUP; |
4813 | } | |
f66afbe2 | 4814 | } else if (g_str_has_prefix(desc->name, "encrypt.")) { |
d1402b50 HR |
4815 | error_setg(errp, |
4816 | "Changing the encryption parameters is not supported"); | |
f66afbe2 | 4817 | return -ENOTSUP; |
8a17b83c HR |
4818 | } else if (!strcmp(desc->name, BLOCK_OPT_CLUSTER_SIZE)) { |
4819 | cluster_size = qemu_opt_get_size(opts, BLOCK_OPT_CLUSTER_SIZE, | |
1bd0e2d1 CL |
4820 | cluster_size); |
4821 | if (cluster_size != s->cluster_size) { | |
d1402b50 | 4822 | error_setg(errp, "Changing the cluster size is not supported"); |
9296b3ed HR |
4823 | return -ENOTSUP; |
4824 | } | |
8a17b83c HR |
4825 | } else if (!strcmp(desc->name, BLOCK_OPT_LAZY_REFCOUNTS)) { |
4826 | lazy_refcounts = qemu_opt_get_bool(opts, BLOCK_OPT_LAZY_REFCOUNTS, | |
1bd0e2d1 | 4827 | lazy_refcounts); |
06d05fa7 | 4828 | } else if (!strcmp(desc->name, BLOCK_OPT_REFCOUNT_BITS)) { |
61ce55fc HR |
4829 | refcount_bits = qemu_opt_get_number(opts, BLOCK_OPT_REFCOUNT_BITS, |
4830 | refcount_bits); | |
4831 | ||
4832 | if (refcount_bits <= 0 || refcount_bits > 64 || | |
4833 | !is_power_of_2(refcount_bits)) | |
4834 | { | |
d1402b50 HR |
4835 | error_setg(errp, "Refcount width must be a power of two and " |
4836 | "may not exceed 64 bits"); | |
61ce55fc HR |
4837 | return -EINVAL; |
4838 | } | |
9296b3ed | 4839 | } else { |
164e0f89 | 4840 | /* if this point is reached, this probably means a new option was |
9296b3ed | 4841 | * added without having it covered here */ |
164e0f89 | 4842 | abort(); |
9296b3ed | 4843 | } |
1bd0e2d1 CL |
4844 | |
4845 | desc++; | |
9296b3ed HR |
4846 | } |
4847 | ||
c293a809 HR |
4848 | helper_cb_info = (Qcow2AmendHelperCBInfo){ |
4849 | .original_status_cb = status_cb, | |
4850 | .original_cb_opaque = cb_opaque, | |
4851 | .total_operations = (new_version < old_version) | |
61ce55fc | 4852 | + (s->refcount_bits != refcount_bits) |
c293a809 HR |
4853 | }; |
4854 | ||
1038bbb8 HR |
4855 | /* Upgrade first (some features may require compat=1.1) */ |
4856 | if (new_version > old_version) { | |
4857 | s->qcow_version = new_version; | |
4858 | ret = qcow2_update_header(bs); | |
4859 | if (ret < 0) { | |
4860 | s->qcow_version = old_version; | |
d1402b50 | 4861 | error_setg_errno(errp, -ret, "Failed to update the image header"); |
1038bbb8 | 4862 | return ret; |
9296b3ed HR |
4863 | } |
4864 | } | |
4865 | ||
61ce55fc HR |
4866 | if (s->refcount_bits != refcount_bits) { |
4867 | int refcount_order = ctz32(refcount_bits); | |
61ce55fc HR |
4868 | |
4869 | if (new_version < 3 && refcount_bits != 16) { | |
d1402b50 HR |
4870 | error_setg(errp, "Refcount widths other than 16 bits require " |
4871 | "compatibility level 1.1 or above (use compat=1.1 or " | |
4872 | "greater)"); | |
61ce55fc HR |
4873 | return -EINVAL; |
4874 | } | |
4875 | ||
4876 | helper_cb_info.current_operation = QCOW2_CHANGING_REFCOUNT_ORDER; | |
4877 | ret = qcow2_change_refcount_order(bs, refcount_order, | |
4878 | &qcow2_amend_helper_cb, | |
d1402b50 | 4879 | &helper_cb_info, errp); |
61ce55fc | 4880 | if (ret < 0) { |
61ce55fc HR |
4881 | return ret; |
4882 | } | |
4883 | } | |
4884 | ||
9296b3ed | 4885 | if (backing_file || backing_format) { |
e4603fe1 KW |
4886 | ret = qcow2_change_backing_file(bs, |
4887 | backing_file ?: s->image_backing_file, | |
4888 | backing_format ?: s->image_backing_format); | |
9296b3ed | 4889 | if (ret < 0) { |
d1402b50 | 4890 | error_setg_errno(errp, -ret, "Failed to change the backing file"); |
9296b3ed HR |
4891 | return ret; |
4892 | } | |
4893 | } | |
4894 | ||
4895 | if (s->use_lazy_refcounts != lazy_refcounts) { | |
4896 | if (lazy_refcounts) { | |
1038bbb8 | 4897 | if (new_version < 3) { |
d1402b50 HR |
4898 | error_setg(errp, "Lazy refcounts only supported with " |
4899 | "compatibility level 1.1 and above (use compat=1.1 " | |
4900 | "or greater)"); | |
9296b3ed HR |
4901 | return -EINVAL; |
4902 | } | |
4903 | s->compatible_features |= QCOW2_COMPAT_LAZY_REFCOUNTS; | |
4904 | ret = qcow2_update_header(bs); | |
4905 | if (ret < 0) { | |
4906 | s->compatible_features &= ~QCOW2_COMPAT_LAZY_REFCOUNTS; | |
d1402b50 | 4907 | error_setg_errno(errp, -ret, "Failed to update the image header"); |
9296b3ed HR |
4908 | return ret; |
4909 | } | |
4910 | s->use_lazy_refcounts = true; | |
4911 | } else { | |
4912 | /* make image clean first */ | |
4913 | ret = qcow2_mark_clean(bs); | |
4914 | if (ret < 0) { | |
d1402b50 | 4915 | error_setg_errno(errp, -ret, "Failed to make the image clean"); |
9296b3ed HR |
4916 | return ret; |
4917 | } | |
4918 | /* now disallow lazy refcounts */ | |
4919 | s->compatible_features &= ~QCOW2_COMPAT_LAZY_REFCOUNTS; | |
4920 | ret = qcow2_update_header(bs); | |
4921 | if (ret < 0) { | |
4922 | s->compatible_features |= QCOW2_COMPAT_LAZY_REFCOUNTS; | |
d1402b50 | 4923 | error_setg_errno(errp, -ret, "Failed to update the image header"); |
9296b3ed HR |
4924 | return ret; |
4925 | } | |
4926 | s->use_lazy_refcounts = false; | |
4927 | } | |
4928 | } | |
4929 | ||
4930 | if (new_size) { | |
6d0eb64d | 4931 | BlockBackend *blk = blk_new(BLK_PERM_RESIZE, BLK_PERM_ALL); |
d1402b50 | 4932 | ret = blk_insert_bs(blk, bs, errp); |
d7086422 | 4933 | if (ret < 0) { |
d7086422 KW |
4934 | blk_unref(blk); |
4935 | return ret; | |
4936 | } | |
4937 | ||
d1402b50 | 4938 | ret = blk_truncate(blk, new_size, PREALLOC_MODE_OFF, errp); |
70b27f36 | 4939 | blk_unref(blk); |
9296b3ed HR |
4940 | if (ret < 0) { |
4941 | return ret; | |
4942 | } | |
4943 | } | |
4944 | ||
1038bbb8 HR |
4945 | /* Downgrade last (so unsupported features can be removed before) */ |
4946 | if (new_version < old_version) { | |
c293a809 HR |
4947 | helper_cb_info.current_operation = QCOW2_DOWNGRADING; |
4948 | ret = qcow2_downgrade(bs, new_version, &qcow2_amend_helper_cb, | |
d1402b50 | 4949 | &helper_cb_info, errp); |
1038bbb8 HR |
4950 | if (ret < 0) { |
4951 | return ret; | |
4952 | } | |
4953 | } | |
4954 | ||
9296b3ed HR |
4955 | return 0; |
4956 | } | |
4957 | ||
85186ebd HR |
4958 | /* |
4959 | * If offset or size are negative, respectively, they will not be included in | |
4960 | * the BLOCK_IMAGE_CORRUPTED event emitted. | |
4961 | * fatal will be ignored for read-only BDS; corruptions found there will always | |
4962 | * be considered non-fatal. | |
4963 | */ | |
4964 | void qcow2_signal_corruption(BlockDriverState *bs, bool fatal, int64_t offset, | |
4965 | int64_t size, const char *message_format, ...) | |
4966 | { | |
ff99129a | 4967 | BDRVQcow2State *s = bs->opaque; |
dc881b44 | 4968 | const char *node_name; |
85186ebd HR |
4969 | char *message; |
4970 | va_list ap; | |
4971 | ||
ddf3b47e | 4972 | fatal = fatal && bdrv_is_writable(bs); |
85186ebd HR |
4973 | |
4974 | if (s->signaled_corruption && | |
4975 | (!fatal || (s->incompatible_features & QCOW2_INCOMPAT_CORRUPT))) | |
4976 | { | |
4977 | return; | |
4978 | } | |
4979 | ||
4980 | va_start(ap, message_format); | |
4981 | message = g_strdup_vprintf(message_format, ap); | |
4982 | va_end(ap); | |
4983 | ||
4984 | if (fatal) { | |
4985 | fprintf(stderr, "qcow2: Marking image as corrupt: %s; further " | |
4986 | "corruption events will be suppressed\n", message); | |
4987 | } else { | |
4988 | fprintf(stderr, "qcow2: Image is corrupt: %s; further non-fatal " | |
4989 | "corruption events will be suppressed\n", message); | |
4990 | } | |
4991 | ||
dc881b44 AG |
4992 | node_name = bdrv_get_node_name(bs); |
4993 | qapi_event_send_block_image_corrupted(bdrv_get_device_name(bs), | |
4994 | *node_name != '\0', node_name, | |
4995 | message, offset >= 0, offset, | |
4996 | size >= 0, size, | |
3ab72385 | 4997 | fatal); |
85186ebd HR |
4998 | g_free(message); |
4999 | ||
5000 | if (fatal) { | |
5001 | qcow2_mark_corrupt(bs); | |
5002 | bs->drv = NULL; /* make BDS unusable */ | |
5003 | } | |
5004 | ||
5005 | s->signaled_corruption = true; | |
5006 | } | |
5007 | ||
1bd0e2d1 CL |
5008 | static QemuOptsList qcow2_create_opts = { |
5009 | .name = "qcow2-create-opts", | |
5010 | .head = QTAILQ_HEAD_INITIALIZER(qcow2_create_opts.head), | |
5011 | .desc = { | |
5012 | { | |
5013 | .name = BLOCK_OPT_SIZE, | |
5014 | .type = QEMU_OPT_SIZE, | |
5015 | .help = "Virtual disk size" | |
5016 | }, | |
5017 | { | |
5018 | .name = BLOCK_OPT_COMPAT_LEVEL, | |
5019 | .type = QEMU_OPT_STRING, | |
5020 | .help = "Compatibility level (0.10 or 1.1)" | |
5021 | }, | |
5022 | { | |
5023 | .name = BLOCK_OPT_BACKING_FILE, | |
5024 | .type = QEMU_OPT_STRING, | |
5025 | .help = "File name of a base image" | |
5026 | }, | |
5027 | { | |
5028 | .name = BLOCK_OPT_BACKING_FMT, | |
5029 | .type = QEMU_OPT_STRING, | |
5030 | .help = "Image format of the base image" | |
5031 | }, | |
5032 | { | |
5033 | .name = BLOCK_OPT_ENCRYPT, | |
5034 | .type = QEMU_OPT_BOOL, | |
0cb8d47b DB |
5035 | .help = "Encrypt the image with format 'aes'. (Deprecated " |
5036 | "in favor of " BLOCK_OPT_ENCRYPT_FORMAT "=aes)", | |
5037 | }, | |
5038 | { | |
5039 | .name = BLOCK_OPT_ENCRYPT_FORMAT, | |
5040 | .type = QEMU_OPT_STRING, | |
4652b8f3 | 5041 | .help = "Encrypt the image, format choices: 'aes', 'luks'", |
1bd0e2d1 | 5042 | }, |
4652b8f3 DB |
5043 | BLOCK_CRYPTO_OPT_DEF_KEY_SECRET("encrypt.", |
5044 | "ID of secret providing qcow AES key or LUKS passphrase"), | |
5045 | BLOCK_CRYPTO_OPT_DEF_LUKS_CIPHER_ALG("encrypt."), | |
5046 | BLOCK_CRYPTO_OPT_DEF_LUKS_CIPHER_MODE("encrypt."), | |
5047 | BLOCK_CRYPTO_OPT_DEF_LUKS_IVGEN_ALG("encrypt."), | |
5048 | BLOCK_CRYPTO_OPT_DEF_LUKS_IVGEN_HASH_ALG("encrypt."), | |
5049 | BLOCK_CRYPTO_OPT_DEF_LUKS_HASH_ALG("encrypt."), | |
5050 | BLOCK_CRYPTO_OPT_DEF_LUKS_ITER_TIME("encrypt."), | |
1bd0e2d1 CL |
5051 | { |
5052 | .name = BLOCK_OPT_CLUSTER_SIZE, | |
5053 | .type = QEMU_OPT_SIZE, | |
5054 | .help = "qcow2 cluster size", | |
5055 | .def_value_str = stringify(DEFAULT_CLUSTER_SIZE) | |
5056 | }, | |
5057 | { | |
5058 | .name = BLOCK_OPT_PREALLOC, | |
5059 | .type = QEMU_OPT_STRING, | |
0e4271b7 HT |
5060 | .help = "Preallocation mode (allowed values: off, metadata, " |
5061 | "falloc, full)" | |
1bd0e2d1 CL |
5062 | }, |
5063 | { | |
5064 | .name = BLOCK_OPT_LAZY_REFCOUNTS, | |
5065 | .type = QEMU_OPT_BOOL, | |
5066 | .help = "Postpone refcount updates", | |
5067 | .def_value_str = "off" | |
5068 | }, | |
06d05fa7 HR |
5069 | { |
5070 | .name = BLOCK_OPT_REFCOUNT_BITS, | |
5071 | .type = QEMU_OPT_NUMBER, | |
5072 | .help = "Width of a reference count entry in bits", | |
5073 | .def_value_str = "16" | |
5074 | }, | |
1bd0e2d1 CL |
5075 | { /* end of list */ } |
5076 | } | |
20d97356 BS |
5077 | }; |
5078 | ||
2654267c HR |
5079 | static const char *const qcow2_strong_runtime_opts[] = { |
5080 | "encrypt." BLOCK_CRYPTO_OPT_QCOW_KEY_SECRET, | |
5081 | ||
5082 | NULL | |
5083 | }; | |
5084 | ||
5f535a94 | 5085 | BlockDriver bdrv_qcow2 = { |
7c80ab3f | 5086 | .format_name = "qcow2", |
ff99129a | 5087 | .instance_size = sizeof(BDRVQcow2State), |
7c80ab3f JS |
5088 | .bdrv_probe = qcow2_probe, |
5089 | .bdrv_open = qcow2_open, | |
5090 | .bdrv_close = qcow2_close, | |
21d82ac9 | 5091 | .bdrv_reopen_prepare = qcow2_reopen_prepare, |
5b0959a7 KW |
5092 | .bdrv_reopen_commit = qcow2_reopen_commit, |
5093 | .bdrv_reopen_abort = qcow2_reopen_abort, | |
5365f44d | 5094 | .bdrv_join_options = qcow2_join_options, |
862f215f | 5095 | .bdrv_child_perm = bdrv_format_default_perms, |
efc75e2a | 5096 | .bdrv_co_create_opts = qcow2_co_create_opts, |
b0292b85 | 5097 | .bdrv_co_create = qcow2_co_create, |
3ac21627 | 5098 | .bdrv_has_zero_init = bdrv_has_zero_init_1, |
a320fb04 | 5099 | .bdrv_co_block_status = qcow2_co_block_status, |
7c80ab3f | 5100 | |
ecfe1863 | 5101 | .bdrv_co_preadv = qcow2_co_preadv, |
d46a0bb2 | 5102 | .bdrv_co_pwritev = qcow2_co_pwritev, |
eb489bb1 | 5103 | .bdrv_co_flush_to_os = qcow2_co_flush_to_os, |
419b19d9 | 5104 | |
5544b59f | 5105 | .bdrv_co_pwrite_zeroes = qcow2_co_pwrite_zeroes, |
82e8a788 | 5106 | .bdrv_co_pdiscard = qcow2_co_pdiscard, |
fd9fcd37 FZ |
5107 | .bdrv_co_copy_range_from = qcow2_co_copy_range_from, |
5108 | .bdrv_co_copy_range_to = qcow2_co_copy_range_to, | |
061ca8a3 | 5109 | .bdrv_co_truncate = qcow2_co_truncate, |
fcccefc5 | 5110 | .bdrv_co_pwritev_compressed = qcow2_co_pwritev_compressed, |
491d27e2 | 5111 | .bdrv_make_empty = qcow2_make_empty, |
20d97356 BS |
5112 | |
5113 | .bdrv_snapshot_create = qcow2_snapshot_create, | |
5114 | .bdrv_snapshot_goto = qcow2_snapshot_goto, | |
5115 | .bdrv_snapshot_delete = qcow2_snapshot_delete, | |
5116 | .bdrv_snapshot_list = qcow2_snapshot_list, | |
1bd0e2d1 | 5117 | .bdrv_snapshot_load_tmp = qcow2_snapshot_load_tmp, |
c501c352 | 5118 | .bdrv_measure = qcow2_measure, |
1bd0e2d1 | 5119 | .bdrv_get_info = qcow2_get_info, |
37764dfb | 5120 | .bdrv_get_specific_info = qcow2_get_specific_info, |
20d97356 | 5121 | |
7c80ab3f JS |
5122 | .bdrv_save_vmstate = qcow2_save_vmstate, |
5123 | .bdrv_load_vmstate = qcow2_load_vmstate, | |
20d97356 | 5124 | |
8ee79e70 | 5125 | .supports_backing = true, |
20d97356 BS |
5126 | .bdrv_change_backing_file = qcow2_change_backing_file, |
5127 | ||
d34682cd | 5128 | .bdrv_refresh_limits = qcow2_refresh_limits, |
2b148f39 | 5129 | .bdrv_co_invalidate_cache = qcow2_co_invalidate_cache, |
ec6d8912 | 5130 | .bdrv_inactivate = qcow2_inactivate, |
06d9260f | 5131 | |
1bd0e2d1 | 5132 | .create_opts = &qcow2_create_opts, |
2654267c | 5133 | .strong_runtime_opts = qcow2_strong_runtime_opts, |
2fd61638 | 5134 | .bdrv_co_check = qcow2_co_check, |
c282e1fd | 5135 | .bdrv_amend_options = qcow2_amend_options, |
279621c0 AG |
5136 | |
5137 | .bdrv_detach_aio_context = qcow2_detach_aio_context, | |
5138 | .bdrv_attach_aio_context = qcow2_attach_aio_context, | |
1b6b0562 VSO |
5139 | |
5140 | .bdrv_reopen_bitmaps_rw = qcow2_reopen_bitmaps_rw, | |
da0eb242 | 5141 | .bdrv_can_store_new_dirty_bitmap = qcow2_can_store_new_dirty_bitmap, |
469c71ed | 5142 | .bdrv_remove_persistent_dirty_bitmap = qcow2_remove_persistent_dirty_bitmap, |
20d97356 BS |
5143 | }; |
5144 | ||
5efa9d5a AL |
5145 | static void bdrv_qcow2_init(void) |
5146 | { | |
5147 | bdrv_register(&bdrv_qcow2); | |
5148 | } | |
5149 | ||
5150 | block_init(bdrv_qcow2_init); |