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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 | */ | |
faf07963 | 24 | #include "qemu-common.h" |
737e150e | 25 | #include "block/block_int.h" |
1de7afc9 | 26 | #include "qemu/module.h" |
585f8587 | 27 | #include <zlib.h> |
753d9b82 | 28 | #include "qemu/aes.h" |
f7d0fe02 | 29 | #include "block/qcow2.h" |
1de7afc9 | 30 | #include "qemu/error-report.h" |
7b1b5d19 | 31 | #include "qapi/qmp/qerror.h" |
acdfb480 | 32 | #include "qapi/qmp/qbool.h" |
3cce16f4 | 33 | #include "trace.h" |
585f8587 FB |
34 | |
35 | /* | |
36 | Differences with QCOW: | |
37 | ||
38 | - Support for multiple incremental snapshots. | |
39 | - Memory management by reference counts. | |
40 | - Clusters which have a reference count of one have the bit | |
41 | QCOW_OFLAG_COPIED to optimize write performance. | |
5fafdf24 | 42 | - Size of compressed clusters is stored in sectors to reduce bit usage |
585f8587 FB |
43 | in the cluster offsets. |
44 | - Support for storing additional data (such as the VM state) in the | |
3b46e624 | 45 | snapshots. |
585f8587 FB |
46 | - If a backing store is used, the cluster size is not constrained |
47 | (could be backported to QCOW). | |
48 | - L2 tables have always a size of one cluster. | |
49 | */ | |
50 | ||
9b80ddf3 AL |
51 | |
52 | typedef struct { | |
53 | uint32_t magic; | |
54 | uint32_t len; | |
c4217f64 | 55 | } QEMU_PACKED QCowExtension; |
21d82ac9 | 56 | |
7c80ab3f JS |
57 | #define QCOW2_EXT_MAGIC_END 0 |
58 | #define QCOW2_EXT_MAGIC_BACKING_FORMAT 0xE2792ACA | |
cfcc4c62 | 59 | #define QCOW2_EXT_MAGIC_FEATURE_TABLE 0x6803f857 |
9b80ddf3 | 60 | |
7c80ab3f | 61 | static int qcow2_probe(const uint8_t *buf, int buf_size, const char *filename) |
585f8587 FB |
62 | { |
63 | const QCowHeader *cow_header = (const void *)buf; | |
3b46e624 | 64 | |
585f8587 FB |
65 | if (buf_size >= sizeof(QCowHeader) && |
66 | be32_to_cpu(cow_header->magic) == QCOW_MAGIC && | |
6744cbab | 67 | be32_to_cpu(cow_header->version) >= 2) |
585f8587 FB |
68 | return 100; |
69 | else | |
70 | return 0; | |
71 | } | |
72 | ||
9b80ddf3 AL |
73 | |
74 | /* | |
75 | * read qcow2 extension and fill bs | |
76 | * start reading from start_offset | |
77 | * finish reading upon magic of value 0 or when end_offset reached | |
78 | * unknown magic is skipped (future extension this version knows nothing about) | |
79 | * return 0 upon success, non-0 otherwise | |
80 | */ | |
7c80ab3f | 81 | static int qcow2_read_extensions(BlockDriverState *bs, uint64_t start_offset, |
3ef6c40a HR |
82 | uint64_t end_offset, void **p_feature_table, |
83 | Error **errp) | |
9b80ddf3 | 84 | { |
75bab85c | 85 | BDRVQcowState *s = bs->opaque; |
9b80ddf3 AL |
86 | QCowExtension ext; |
87 | uint64_t offset; | |
75bab85c | 88 | int ret; |
9b80ddf3 AL |
89 | |
90 | #ifdef DEBUG_EXT | |
7c80ab3f | 91 | printf("qcow2_read_extensions: start=%ld end=%ld\n", start_offset, end_offset); |
9b80ddf3 AL |
92 | #endif |
93 | offset = start_offset; | |
94 | while (offset < end_offset) { | |
95 | ||
96 | #ifdef DEBUG_EXT | |
97 | /* Sanity check */ | |
98 | if (offset > s->cluster_size) | |
7c80ab3f | 99 | printf("qcow2_read_extension: suspicious offset %lu\n", offset); |
9b80ddf3 | 100 | |
9b2260cb | 101 | printf("attempting to read extended header in offset %lu\n", offset); |
9b80ddf3 AL |
102 | #endif |
103 | ||
3ef6c40a HR |
104 | ret = bdrv_pread(bs->file, offset, &ext, sizeof(ext)); |
105 | if (ret < 0) { | |
106 | error_setg_errno(errp, -ret, "qcow2_read_extension: ERROR: " | |
107 | "pread fail from offset %" PRIu64, offset); | |
9b80ddf3 AL |
108 | return 1; |
109 | } | |
110 | be32_to_cpus(&ext.magic); | |
111 | be32_to_cpus(&ext.len); | |
112 | offset += sizeof(ext); | |
113 | #ifdef DEBUG_EXT | |
114 | printf("ext.magic = 0x%x\n", ext.magic); | |
115 | #endif | |
64ca6aee | 116 | if (ext.len > end_offset - offset) { |
3ef6c40a | 117 | error_setg(errp, "Header extension too large"); |
64ca6aee KW |
118 | return -EINVAL; |
119 | } | |
120 | ||
9b80ddf3 | 121 | switch (ext.magic) { |
7c80ab3f | 122 | case QCOW2_EXT_MAGIC_END: |
9b80ddf3 | 123 | return 0; |
f965509c | 124 | |
7c80ab3f | 125 | case QCOW2_EXT_MAGIC_BACKING_FORMAT: |
f965509c | 126 | if (ext.len >= sizeof(bs->backing_format)) { |
3ef6c40a HR |
127 | error_setg(errp, "ERROR: ext_backing_format: len=%u too large" |
128 | " (>=%zu)", ext.len, sizeof(bs->backing_format)); | |
f965509c AL |
129 | return 2; |
130 | } | |
3ef6c40a HR |
131 | ret = bdrv_pread(bs->file, offset, bs->backing_format, ext.len); |
132 | if (ret < 0) { | |
133 | error_setg_errno(errp, -ret, "ERROR: ext_backing_format: " | |
134 | "Could not read format name"); | |
f965509c | 135 | return 3; |
3ef6c40a | 136 | } |
f965509c AL |
137 | bs->backing_format[ext.len] = '\0'; |
138 | #ifdef DEBUG_EXT | |
139 | printf("Qcow2: Got format extension %s\n", bs->backing_format); | |
140 | #endif | |
f965509c AL |
141 | break; |
142 | ||
cfcc4c62 KW |
143 | case QCOW2_EXT_MAGIC_FEATURE_TABLE: |
144 | if (p_feature_table != NULL) { | |
145 | void* feature_table = g_malloc0(ext.len + 2 * sizeof(Qcow2Feature)); | |
146 | ret = bdrv_pread(bs->file, offset , feature_table, ext.len); | |
147 | if (ret < 0) { | |
3ef6c40a HR |
148 | error_setg_errno(errp, -ret, "ERROR: ext_feature_table: " |
149 | "Could not read table"); | |
cfcc4c62 KW |
150 | return ret; |
151 | } | |
152 | ||
153 | *p_feature_table = feature_table; | |
154 | } | |
155 | break; | |
156 | ||
9b80ddf3 | 157 | default: |
75bab85c KW |
158 | /* unknown magic - save it in case we need to rewrite the header */ |
159 | { | |
160 | Qcow2UnknownHeaderExtension *uext; | |
161 | ||
162 | uext = g_malloc0(sizeof(*uext) + ext.len); | |
163 | uext->magic = ext.magic; | |
164 | uext->len = ext.len; | |
165 | QLIST_INSERT_HEAD(&s->unknown_header_ext, uext, next); | |
166 | ||
167 | ret = bdrv_pread(bs->file, offset , uext->data, uext->len); | |
168 | if (ret < 0) { | |
3ef6c40a HR |
169 | error_setg_errno(errp, -ret, "ERROR: unknown extension: " |
170 | "Could not read data"); | |
75bab85c KW |
171 | return ret; |
172 | } | |
75bab85c | 173 | } |
9b80ddf3 AL |
174 | break; |
175 | } | |
fd29b4bb KW |
176 | |
177 | offset += ((ext.len + 7) & ~7); | |
9b80ddf3 AL |
178 | } |
179 | ||
180 | return 0; | |
181 | } | |
182 | ||
75bab85c KW |
183 | static void cleanup_unknown_header_ext(BlockDriverState *bs) |
184 | { | |
185 | BDRVQcowState *s = bs->opaque; | |
186 | Qcow2UnknownHeaderExtension *uext, *next; | |
187 | ||
188 | QLIST_FOREACH_SAFE(uext, &s->unknown_header_ext, next, next) { | |
189 | QLIST_REMOVE(uext, next); | |
190 | g_free(uext); | |
191 | } | |
192 | } | |
9b80ddf3 | 193 | |
3ef6c40a HR |
194 | static void GCC_FMT_ATTR(3, 4) report_unsupported(BlockDriverState *bs, |
195 | Error **errp, const char *fmt, ...) | |
6744cbab KW |
196 | { |
197 | char msg[64]; | |
198 | va_list ap; | |
199 | ||
200 | va_start(ap, fmt); | |
201 | vsnprintf(msg, sizeof(msg), fmt, ap); | |
202 | va_end(ap); | |
203 | ||
3ef6c40a HR |
204 | error_set(errp, QERR_UNKNOWN_BLOCK_FORMAT_FEATURE, bs->device_name, "qcow2", |
205 | msg); | |
6744cbab KW |
206 | } |
207 | ||
cfcc4c62 | 208 | static void report_unsupported_feature(BlockDriverState *bs, |
3ef6c40a | 209 | Error **errp, Qcow2Feature *table, uint64_t mask) |
cfcc4c62 KW |
210 | { |
211 | while (table && table->name[0] != '\0') { | |
212 | if (table->type == QCOW2_FEAT_TYPE_INCOMPATIBLE) { | |
213 | if (mask & (1 << table->bit)) { | |
3ef6c40a | 214 | report_unsupported(bs, errp, "%.46s", table->name); |
cfcc4c62 KW |
215 | mask &= ~(1 << table->bit); |
216 | } | |
217 | } | |
218 | table++; | |
219 | } | |
220 | ||
221 | if (mask) { | |
3ef6c40a HR |
222 | report_unsupported(bs, errp, "Unknown incompatible feature: %" PRIx64, |
223 | mask); | |
cfcc4c62 KW |
224 | } |
225 | } | |
226 | ||
bfe8043e SH |
227 | /* |
228 | * Sets the dirty bit and flushes afterwards if necessary. | |
229 | * | |
230 | * The incompatible_features bit is only set if the image file header was | |
231 | * updated successfully. Therefore it is not required to check the return | |
232 | * value of this function. | |
233 | */ | |
280d3735 | 234 | int qcow2_mark_dirty(BlockDriverState *bs) |
bfe8043e SH |
235 | { |
236 | BDRVQcowState *s = bs->opaque; | |
237 | uint64_t val; | |
238 | int ret; | |
239 | ||
240 | assert(s->qcow_version >= 3); | |
241 | ||
242 | if (s->incompatible_features & QCOW2_INCOMPAT_DIRTY) { | |
243 | return 0; /* already dirty */ | |
244 | } | |
245 | ||
246 | val = cpu_to_be64(s->incompatible_features | QCOW2_INCOMPAT_DIRTY); | |
247 | ret = bdrv_pwrite(bs->file, offsetof(QCowHeader, incompatible_features), | |
248 | &val, sizeof(val)); | |
249 | if (ret < 0) { | |
250 | return ret; | |
251 | } | |
252 | ret = bdrv_flush(bs->file); | |
253 | if (ret < 0) { | |
254 | return ret; | |
255 | } | |
256 | ||
257 | /* Only treat image as dirty if the header was updated successfully */ | |
258 | s->incompatible_features |= QCOW2_INCOMPAT_DIRTY; | |
259 | return 0; | |
260 | } | |
261 | ||
c61d0004 SH |
262 | /* |
263 | * Clears the dirty bit and flushes before if necessary. Only call this | |
264 | * function when there are no pending requests, it does not guard against | |
265 | * concurrent requests dirtying the image. | |
266 | */ | |
267 | static int qcow2_mark_clean(BlockDriverState *bs) | |
268 | { | |
269 | BDRVQcowState *s = bs->opaque; | |
270 | ||
271 | if (s->incompatible_features & QCOW2_INCOMPAT_DIRTY) { | |
272 | int ret = bdrv_flush(bs); | |
273 | if (ret < 0) { | |
274 | return ret; | |
275 | } | |
276 | ||
277 | s->incompatible_features &= ~QCOW2_INCOMPAT_DIRTY; | |
278 | return qcow2_update_header(bs); | |
279 | } | |
280 | return 0; | |
281 | } | |
282 | ||
69c98726 HR |
283 | /* |
284 | * Marks the image as corrupt. | |
285 | */ | |
286 | int qcow2_mark_corrupt(BlockDriverState *bs) | |
287 | { | |
288 | BDRVQcowState *s = bs->opaque; | |
289 | ||
290 | s->incompatible_features |= QCOW2_INCOMPAT_CORRUPT; | |
291 | return qcow2_update_header(bs); | |
292 | } | |
293 | ||
294 | /* | |
295 | * Marks the image as consistent, i.e., unsets the corrupt bit, and flushes | |
296 | * before if necessary. | |
297 | */ | |
298 | int qcow2_mark_consistent(BlockDriverState *bs) | |
299 | { | |
300 | BDRVQcowState *s = bs->opaque; | |
301 | ||
302 | if (s->incompatible_features & QCOW2_INCOMPAT_CORRUPT) { | |
303 | int ret = bdrv_flush(bs); | |
304 | if (ret < 0) { | |
305 | return ret; | |
306 | } | |
307 | ||
308 | s->incompatible_features &= ~QCOW2_INCOMPAT_CORRUPT; | |
309 | return qcow2_update_header(bs); | |
310 | } | |
311 | return 0; | |
312 | } | |
313 | ||
acbe5982 SH |
314 | static int qcow2_check(BlockDriverState *bs, BdrvCheckResult *result, |
315 | BdrvCheckMode fix) | |
316 | { | |
317 | int ret = qcow2_check_refcounts(bs, result, fix); | |
318 | if (ret < 0) { | |
319 | return ret; | |
320 | } | |
321 | ||
322 | if (fix && result->check_errors == 0 && result->corruptions == 0) { | |
24530f3e HR |
323 | ret = qcow2_mark_clean(bs); |
324 | if (ret < 0) { | |
325 | return ret; | |
326 | } | |
327 | return qcow2_mark_consistent(bs); | |
acbe5982 SH |
328 | } |
329 | return ret; | |
330 | } | |
331 | ||
8c7de283 KW |
332 | static int validate_table_offset(BlockDriverState *bs, uint64_t offset, |
333 | uint64_t entries, size_t entry_len) | |
334 | { | |
335 | BDRVQcowState *s = bs->opaque; | |
336 | uint64_t size; | |
337 | ||
338 | /* Use signed INT64_MAX as the maximum even for uint64_t header fields, | |
339 | * because values will be passed to qemu functions taking int64_t. */ | |
340 | if (entries > INT64_MAX / entry_len) { | |
341 | return -EINVAL; | |
342 | } | |
343 | ||
344 | size = entries * entry_len; | |
345 | ||
346 | if (INT64_MAX - size < offset) { | |
347 | return -EINVAL; | |
348 | } | |
349 | ||
350 | /* Tables must be cluster aligned */ | |
351 | if (offset & (s->cluster_size - 1)) { | |
352 | return -EINVAL; | |
353 | } | |
354 | ||
355 | return 0; | |
356 | } | |
357 | ||
74c4510a KW |
358 | static QemuOptsList qcow2_runtime_opts = { |
359 | .name = "qcow2", | |
360 | .head = QTAILQ_HEAD_INITIALIZER(qcow2_runtime_opts.head), | |
361 | .desc = { | |
362 | { | |
64aa99d3 | 363 | .name = QCOW2_OPT_LAZY_REFCOUNTS, |
74c4510a KW |
364 | .type = QEMU_OPT_BOOL, |
365 | .help = "Postpone refcount updates", | |
366 | }, | |
67af674e KW |
367 | { |
368 | .name = QCOW2_OPT_DISCARD_REQUEST, | |
369 | .type = QEMU_OPT_BOOL, | |
370 | .help = "Pass guest discard requests to the layer below", | |
371 | }, | |
372 | { | |
373 | .name = QCOW2_OPT_DISCARD_SNAPSHOT, | |
374 | .type = QEMU_OPT_BOOL, | |
375 | .help = "Generate discard requests when snapshot related space " | |
376 | "is freed", | |
377 | }, | |
378 | { | |
379 | .name = QCOW2_OPT_DISCARD_OTHER, | |
380 | .type = QEMU_OPT_BOOL, | |
381 | .help = "Generate discard requests when other clusters are freed", | |
382 | }, | |
05de7e86 HR |
383 | { |
384 | .name = QCOW2_OPT_OVERLAP, | |
385 | .type = QEMU_OPT_STRING, | |
386 | .help = "Selects which overlap checks to perform from a range of " | |
387 | "templates (none, constant, cached, all)", | |
388 | }, | |
389 | { | |
390 | .name = QCOW2_OPT_OVERLAP_MAIN_HEADER, | |
391 | .type = QEMU_OPT_BOOL, | |
392 | .help = "Check for unintended writes into the main qcow2 header", | |
393 | }, | |
394 | { | |
395 | .name = QCOW2_OPT_OVERLAP_ACTIVE_L1, | |
396 | .type = QEMU_OPT_BOOL, | |
397 | .help = "Check for unintended writes into the active L1 table", | |
398 | }, | |
399 | { | |
400 | .name = QCOW2_OPT_OVERLAP_ACTIVE_L2, | |
401 | .type = QEMU_OPT_BOOL, | |
402 | .help = "Check for unintended writes into an active L2 table", | |
403 | }, | |
404 | { | |
405 | .name = QCOW2_OPT_OVERLAP_REFCOUNT_TABLE, | |
406 | .type = QEMU_OPT_BOOL, | |
407 | .help = "Check for unintended writes into the refcount table", | |
408 | }, | |
409 | { | |
410 | .name = QCOW2_OPT_OVERLAP_REFCOUNT_BLOCK, | |
411 | .type = QEMU_OPT_BOOL, | |
412 | .help = "Check for unintended writes into a refcount block", | |
413 | }, | |
414 | { | |
415 | .name = QCOW2_OPT_OVERLAP_SNAPSHOT_TABLE, | |
416 | .type = QEMU_OPT_BOOL, | |
417 | .help = "Check for unintended writes into the snapshot table", | |
418 | }, | |
419 | { | |
420 | .name = QCOW2_OPT_OVERLAP_INACTIVE_L1, | |
421 | .type = QEMU_OPT_BOOL, | |
422 | .help = "Check for unintended writes into an inactive L1 table", | |
423 | }, | |
424 | { | |
425 | .name = QCOW2_OPT_OVERLAP_INACTIVE_L2, | |
426 | .type = QEMU_OPT_BOOL, | |
427 | .help = "Check for unintended writes into an inactive L2 table", | |
428 | }, | |
74c4510a KW |
429 | { /* end of list */ } |
430 | }, | |
431 | }; | |
432 | ||
4092e99d HR |
433 | static const char *overlap_bool_option_names[QCOW2_OL_MAX_BITNR] = { |
434 | [QCOW2_OL_MAIN_HEADER_BITNR] = QCOW2_OPT_OVERLAP_MAIN_HEADER, | |
435 | [QCOW2_OL_ACTIVE_L1_BITNR] = QCOW2_OPT_OVERLAP_ACTIVE_L1, | |
436 | [QCOW2_OL_ACTIVE_L2_BITNR] = QCOW2_OPT_OVERLAP_ACTIVE_L2, | |
437 | [QCOW2_OL_REFCOUNT_TABLE_BITNR] = QCOW2_OPT_OVERLAP_REFCOUNT_TABLE, | |
438 | [QCOW2_OL_REFCOUNT_BLOCK_BITNR] = QCOW2_OPT_OVERLAP_REFCOUNT_BLOCK, | |
439 | [QCOW2_OL_SNAPSHOT_TABLE_BITNR] = QCOW2_OPT_OVERLAP_SNAPSHOT_TABLE, | |
440 | [QCOW2_OL_INACTIVE_L1_BITNR] = QCOW2_OPT_OVERLAP_INACTIVE_L1, | |
441 | [QCOW2_OL_INACTIVE_L2_BITNR] = QCOW2_OPT_OVERLAP_INACTIVE_L2, | |
442 | }; | |
443 | ||
015a1036 HR |
444 | static int qcow2_open(BlockDriverState *bs, QDict *options, int flags, |
445 | Error **errp) | |
585f8587 FB |
446 | { |
447 | BDRVQcowState *s = bs->opaque; | |
6d85a57e | 448 | int len, i, ret = 0; |
585f8587 | 449 | QCowHeader header; |
74c4510a KW |
450 | QemuOpts *opts; |
451 | Error *local_err = NULL; | |
9b80ddf3 | 452 | uint64_t ext_end; |
2cf7cfa1 | 453 | uint64_t l1_vm_state_index; |
1fa5cc83 HR |
454 | const char *opt_overlap_check; |
455 | int overlap_check_template = 0; | |
585f8587 | 456 | |
6d85a57e JS |
457 | ret = bdrv_pread(bs->file, 0, &header, sizeof(header)); |
458 | if (ret < 0) { | |
3ef6c40a | 459 | error_setg_errno(errp, -ret, "Could not read qcow2 header"); |
585f8587 | 460 | goto fail; |
6d85a57e | 461 | } |
585f8587 FB |
462 | be32_to_cpus(&header.magic); |
463 | be32_to_cpus(&header.version); | |
464 | be64_to_cpus(&header.backing_file_offset); | |
465 | be32_to_cpus(&header.backing_file_size); | |
466 | be64_to_cpus(&header.size); | |
467 | be32_to_cpus(&header.cluster_bits); | |
468 | be32_to_cpus(&header.crypt_method); | |
469 | be64_to_cpus(&header.l1_table_offset); | |
470 | be32_to_cpus(&header.l1_size); | |
471 | be64_to_cpus(&header.refcount_table_offset); | |
472 | be32_to_cpus(&header.refcount_table_clusters); | |
473 | be64_to_cpus(&header.snapshots_offset); | |
474 | be32_to_cpus(&header.nb_snapshots); | |
3b46e624 | 475 | |
e8cdcec1 | 476 | if (header.magic != QCOW_MAGIC) { |
3ef6c40a | 477 | error_setg(errp, "Image is not in qcow2 format"); |
76abe407 | 478 | ret = -EINVAL; |
585f8587 | 479 | goto fail; |
6d85a57e | 480 | } |
6744cbab | 481 | if (header.version < 2 || header.version > 3) { |
3ef6c40a | 482 | report_unsupported(bs, errp, "QCOW version %d", header.version); |
6744cbab KW |
483 | ret = -ENOTSUP; |
484 | goto fail; | |
485 | } | |
486 | ||
487 | s->qcow_version = header.version; | |
488 | ||
24342f2c KW |
489 | /* Initialise cluster size */ |
490 | if (header.cluster_bits < MIN_CLUSTER_BITS || | |
491 | header.cluster_bits > MAX_CLUSTER_BITS) { | |
492 | error_setg(errp, "Unsupported cluster size: 2^%i", header.cluster_bits); | |
493 | ret = -EINVAL; | |
494 | goto fail; | |
495 | } | |
496 | ||
497 | s->cluster_bits = header.cluster_bits; | |
498 | s->cluster_size = 1 << s->cluster_bits; | |
499 | s->cluster_sectors = 1 << (s->cluster_bits - 9); | |
500 | ||
6744cbab KW |
501 | /* Initialise version 3 header fields */ |
502 | if (header.version == 2) { | |
503 | header.incompatible_features = 0; | |
504 | header.compatible_features = 0; | |
505 | header.autoclear_features = 0; | |
506 | header.refcount_order = 4; | |
507 | header.header_length = 72; | |
508 | } else { | |
509 | be64_to_cpus(&header.incompatible_features); | |
510 | be64_to_cpus(&header.compatible_features); | |
511 | be64_to_cpus(&header.autoclear_features); | |
512 | be32_to_cpus(&header.refcount_order); | |
513 | be32_to_cpus(&header.header_length); | |
24342f2c KW |
514 | |
515 | if (header.header_length < 104) { | |
516 | error_setg(errp, "qcow2 header too short"); | |
517 | ret = -EINVAL; | |
518 | goto fail; | |
519 | } | |
520 | } | |
521 | ||
522 | if (header.header_length > s->cluster_size) { | |
523 | error_setg(errp, "qcow2 header exceeds cluster size"); | |
524 | ret = -EINVAL; | |
525 | goto fail; | |
6744cbab KW |
526 | } |
527 | ||
528 | if (header.header_length > sizeof(header)) { | |
529 | s->unknown_header_fields_size = header.header_length - sizeof(header); | |
530 | s->unknown_header_fields = g_malloc(s->unknown_header_fields_size); | |
531 | ret = bdrv_pread(bs->file, sizeof(header), s->unknown_header_fields, | |
532 | s->unknown_header_fields_size); | |
533 | if (ret < 0) { | |
3ef6c40a HR |
534 | error_setg_errno(errp, -ret, "Could not read unknown qcow2 header " |
535 | "fields"); | |
6744cbab KW |
536 | goto fail; |
537 | } | |
538 | } | |
539 | ||
a1b3955c KW |
540 | if (header.backing_file_offset > s->cluster_size) { |
541 | error_setg(errp, "Invalid backing file offset"); | |
542 | ret = -EINVAL; | |
543 | goto fail; | |
544 | } | |
545 | ||
cfcc4c62 KW |
546 | if (header.backing_file_offset) { |
547 | ext_end = header.backing_file_offset; | |
548 | } else { | |
549 | ext_end = 1 << header.cluster_bits; | |
550 | } | |
551 | ||
6744cbab KW |
552 | /* Handle feature bits */ |
553 | s->incompatible_features = header.incompatible_features; | |
554 | s->compatible_features = header.compatible_features; | |
555 | s->autoclear_features = header.autoclear_features; | |
556 | ||
c61d0004 | 557 | if (s->incompatible_features & ~QCOW2_INCOMPAT_MASK) { |
cfcc4c62 KW |
558 | void *feature_table = NULL; |
559 | qcow2_read_extensions(bs, header.header_length, ext_end, | |
3ef6c40a HR |
560 | &feature_table, NULL); |
561 | report_unsupported_feature(bs, errp, feature_table, | |
c61d0004 SH |
562 | s->incompatible_features & |
563 | ~QCOW2_INCOMPAT_MASK); | |
6744cbab | 564 | ret = -ENOTSUP; |
c5a33ee9 | 565 | g_free(feature_table); |
6744cbab KW |
566 | goto fail; |
567 | } | |
568 | ||
69c98726 HR |
569 | if (s->incompatible_features & QCOW2_INCOMPAT_CORRUPT) { |
570 | /* Corrupt images may not be written to unless they are being repaired | |
571 | */ | |
572 | if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_CHECK)) { | |
3ef6c40a HR |
573 | error_setg(errp, "qcow2: Image is corrupt; cannot be opened " |
574 | "read/write"); | |
69c98726 HR |
575 | ret = -EACCES; |
576 | goto fail; | |
577 | } | |
578 | } | |
579 | ||
6744cbab KW |
580 | /* Check support for various header values */ |
581 | if (header.refcount_order != 4) { | |
3ef6c40a | 582 | report_unsupported(bs, errp, "%d bit reference counts", |
6744cbab | 583 | 1 << header.refcount_order); |
e8cdcec1 KW |
584 | ret = -ENOTSUP; |
585 | goto fail; | |
586 | } | |
b6481f37 | 587 | s->refcount_order = header.refcount_order; |
6744cbab | 588 | |
6d85a57e | 589 | if (header.crypt_method > QCOW_CRYPT_AES) { |
3ef6c40a HR |
590 | error_setg(errp, "Unsupported encryption method: %i", |
591 | header.crypt_method); | |
6d85a57e | 592 | ret = -EINVAL; |
585f8587 | 593 | goto fail; |
6d85a57e | 594 | } |
585f8587 | 595 | s->crypt_method_header = header.crypt_method; |
6d85a57e | 596 | if (s->crypt_method_header) { |
585f8587 | 597 | bs->encrypted = 1; |
6d85a57e | 598 | } |
24342f2c | 599 | |
585f8587 FB |
600 | s->l2_bits = s->cluster_bits - 3; /* L2 is always one cluster */ |
601 | s->l2_size = 1 << s->l2_bits; | |
602 | bs->total_sectors = header.size / 512; | |
603 | s->csize_shift = (62 - (s->cluster_bits - 8)); | |
604 | s->csize_mask = (1 << (s->cluster_bits - 8)) - 1; | |
605 | s->cluster_offset_mask = (1LL << s->csize_shift) - 1; | |
5dab2fad | 606 | |
585f8587 | 607 | s->refcount_table_offset = header.refcount_table_offset; |
5fafdf24 | 608 | s->refcount_table_size = |
585f8587 FB |
609 | header.refcount_table_clusters << (s->cluster_bits - 3); |
610 | ||
5dab2fad KW |
611 | if (header.refcount_table_clusters > (0x800000 >> s->cluster_bits)) { |
612 | /* 8 MB refcount table is enough for 2 PB images at 64k cluster size | |
613 | * (128 GB for 512 byte clusters, 2 EB for 2 MB clusters) */ | |
614 | error_setg(errp, "Reference count table too large"); | |
615 | ret = -EINVAL; | |
616 | goto fail; | |
617 | } | |
618 | ||
8c7de283 KW |
619 | ret = validate_table_offset(bs, s->refcount_table_offset, |
620 | s->refcount_table_size, sizeof(uint64_t)); | |
621 | if (ret < 0) { | |
622 | error_setg(errp, "Invalid reference count table offset"); | |
623 | goto fail; | |
624 | } | |
625 | ||
ce48f2f4 KW |
626 | /* Snapshot table offset/length */ |
627 | if (header.nb_snapshots > QCOW_MAX_SNAPSHOTS) { | |
628 | error_setg(errp, "Too many snapshots"); | |
629 | ret = -EINVAL; | |
630 | goto fail; | |
631 | } | |
632 | ||
633 | ret = validate_table_offset(bs, header.snapshots_offset, | |
634 | header.nb_snapshots, | |
635 | sizeof(QCowSnapshotHeader)); | |
636 | if (ret < 0) { | |
637 | error_setg(errp, "Invalid snapshot table offset"); | |
638 | goto fail; | |
639 | } | |
640 | ||
585f8587 FB |
641 | s->snapshots_offset = header.snapshots_offset; |
642 | s->nb_snapshots = header.nb_snapshots; | |
643 | ||
644 | /* read the level 1 table */ | |
645 | s->l1_size = header.l1_size; | |
2cf7cfa1 KW |
646 | |
647 | l1_vm_state_index = size_to_l1(s, header.size); | |
648 | if (l1_vm_state_index > INT_MAX) { | |
3ef6c40a | 649 | error_setg(errp, "Image is too big"); |
2cf7cfa1 KW |
650 | ret = -EFBIG; |
651 | goto fail; | |
652 | } | |
653 | s->l1_vm_state_index = l1_vm_state_index; | |
654 | ||
585f8587 FB |
655 | /* the L1 table must contain at least enough entries to put |
656 | header.size bytes */ | |
6d85a57e | 657 | if (s->l1_size < s->l1_vm_state_index) { |
3ef6c40a | 658 | error_setg(errp, "L1 table is too small"); |
6d85a57e | 659 | ret = -EINVAL; |
585f8587 | 660 | goto fail; |
6d85a57e | 661 | } |
585f8587 | 662 | s->l1_table_offset = header.l1_table_offset; |
d191d12d | 663 | if (s->l1_size > 0) { |
7267c094 | 664 | s->l1_table = g_malloc0( |
d191d12d | 665 | align_offset(s->l1_size * sizeof(uint64_t), 512)); |
6d85a57e JS |
666 | ret = bdrv_pread(bs->file, s->l1_table_offset, s->l1_table, |
667 | s->l1_size * sizeof(uint64_t)); | |
668 | if (ret < 0) { | |
3ef6c40a | 669 | error_setg_errno(errp, -ret, "Could not read L1 table"); |
d191d12d | 670 | goto fail; |
6d85a57e | 671 | } |
d191d12d SW |
672 | for(i = 0;i < s->l1_size; i++) { |
673 | be64_to_cpus(&s->l1_table[i]); | |
674 | } | |
585f8587 | 675 | } |
29c1a730 KW |
676 | |
677 | /* alloc L2 table/refcount block cache */ | |
6af4e9ea PB |
678 | s->l2_table_cache = qcow2_cache_create(bs, L2_CACHE_SIZE); |
679 | s->refcount_block_cache = qcow2_cache_create(bs, REFCOUNT_CACHE_SIZE); | |
29c1a730 | 680 | |
7267c094 | 681 | s->cluster_cache = g_malloc(s->cluster_size); |
585f8587 | 682 | /* one more sector for decompressed data alignment */ |
dea43a65 | 683 | s->cluster_data = qemu_blockalign(bs, QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size |
095a9c58 | 684 | + 512); |
585f8587 | 685 | s->cluster_cache_offset = -1; |
06d9260f | 686 | s->flags = flags; |
3b46e624 | 687 | |
6d85a57e JS |
688 | ret = qcow2_refcount_init(bs); |
689 | if (ret != 0) { | |
3ef6c40a | 690 | error_setg_errno(errp, -ret, "Could not initialize refcount handling"); |
585f8587 | 691 | goto fail; |
6d85a57e | 692 | } |
585f8587 | 693 | |
72cf2d4f | 694 | QLIST_INIT(&s->cluster_allocs); |
0b919fae | 695 | QTAILQ_INIT(&s->discards); |
f214978a | 696 | |
9b80ddf3 | 697 | /* read qcow2 extensions */ |
3ef6c40a HR |
698 | if (qcow2_read_extensions(bs, header.header_length, ext_end, NULL, |
699 | &local_err)) { | |
700 | error_propagate(errp, local_err); | |
6d85a57e | 701 | ret = -EINVAL; |
9b80ddf3 | 702 | goto fail; |
6d85a57e | 703 | } |
9b80ddf3 | 704 | |
585f8587 FB |
705 | /* read the backing file name */ |
706 | if (header.backing_file_offset != 0) { | |
707 | len = header.backing_file_size; | |
6d85a57e | 708 | if (len > 1023) { |
585f8587 | 709 | len = 1023; |
6d85a57e JS |
710 | } |
711 | ret = bdrv_pread(bs->file, header.backing_file_offset, | |
712 | bs->backing_file, len); | |
713 | if (ret < 0) { | |
3ef6c40a | 714 | error_setg_errno(errp, -ret, "Could not read backing file name"); |
585f8587 | 715 | goto fail; |
6d85a57e | 716 | } |
585f8587 FB |
717 | bs->backing_file[len] = '\0'; |
718 | } | |
42deb29f KW |
719 | |
720 | ret = qcow2_read_snapshots(bs); | |
721 | if (ret < 0) { | |
3ef6c40a | 722 | error_setg_errno(errp, -ret, "Could not read snapshots"); |
585f8587 | 723 | goto fail; |
6d85a57e | 724 | } |
585f8587 | 725 | |
af7b708d | 726 | /* Clear unknown autoclear feature bits */ |
27eb6c09 | 727 | if (!bs->read_only && !(flags & BDRV_O_INCOMING) && s->autoclear_features) { |
af7b708d SH |
728 | s->autoclear_features = 0; |
729 | ret = qcow2_update_header(bs); | |
730 | if (ret < 0) { | |
3ef6c40a | 731 | error_setg_errno(errp, -ret, "Could not update qcow2 header"); |
af7b708d SH |
732 | goto fail; |
733 | } | |
734 | } | |
735 | ||
68d100e9 KW |
736 | /* Initialise locks */ |
737 | qemu_co_mutex_init(&s->lock); | |
738 | ||
c61d0004 | 739 | /* Repair image if dirty */ |
27eb6c09 | 740 | if (!(flags & (BDRV_O_CHECK | BDRV_O_INCOMING)) && !bs->read_only && |
058f8f16 | 741 | (s->incompatible_features & QCOW2_INCOMPAT_DIRTY)) { |
c61d0004 SH |
742 | BdrvCheckResult result = {0}; |
743 | ||
acbe5982 | 744 | ret = qcow2_check(bs, &result, BDRV_FIX_ERRORS); |
c61d0004 | 745 | if (ret < 0) { |
3ef6c40a | 746 | error_setg_errno(errp, -ret, "Could not repair dirty image"); |
c61d0004 SH |
747 | goto fail; |
748 | } | |
749 | } | |
750 | ||
74c4510a | 751 | /* Enable lazy_refcounts according to image and command line options */ |
87ea75d5 | 752 | opts = qemu_opts_create(&qcow2_runtime_opts, NULL, 0, &error_abort); |
74c4510a | 753 | qemu_opts_absorb_qdict(opts, options, &local_err); |
84d18f06 | 754 | if (local_err) { |
3ef6c40a | 755 | error_propagate(errp, local_err); |
74c4510a KW |
756 | ret = -EINVAL; |
757 | goto fail; | |
758 | } | |
759 | ||
acdfb480 | 760 | s->use_lazy_refcounts = qemu_opt_get_bool(opts, QCOW2_OPT_LAZY_REFCOUNTS, |
74c4510a KW |
761 | (s->compatible_features & QCOW2_COMPAT_LAZY_REFCOUNTS)); |
762 | ||
67af674e KW |
763 | s->discard_passthrough[QCOW2_DISCARD_NEVER] = false; |
764 | s->discard_passthrough[QCOW2_DISCARD_ALWAYS] = true; | |
765 | s->discard_passthrough[QCOW2_DISCARD_REQUEST] = | |
766 | qemu_opt_get_bool(opts, QCOW2_OPT_DISCARD_REQUEST, | |
767 | flags & BDRV_O_UNMAP); | |
768 | s->discard_passthrough[QCOW2_DISCARD_SNAPSHOT] = | |
769 | qemu_opt_get_bool(opts, QCOW2_OPT_DISCARD_SNAPSHOT, true); | |
770 | s->discard_passthrough[QCOW2_DISCARD_OTHER] = | |
771 | qemu_opt_get_bool(opts, QCOW2_OPT_DISCARD_OTHER, false); | |
772 | ||
1fa5cc83 HR |
773 | opt_overlap_check = qemu_opt_get(opts, "overlap-check") ?: "cached"; |
774 | if (!strcmp(opt_overlap_check, "none")) { | |
775 | overlap_check_template = 0; | |
776 | } else if (!strcmp(opt_overlap_check, "constant")) { | |
777 | overlap_check_template = QCOW2_OL_CONSTANT; | |
778 | } else if (!strcmp(opt_overlap_check, "cached")) { | |
779 | overlap_check_template = QCOW2_OL_CACHED; | |
780 | } else if (!strcmp(opt_overlap_check, "all")) { | |
781 | overlap_check_template = QCOW2_OL_ALL; | |
782 | } else { | |
783 | error_setg(errp, "Unsupported value '%s' for qcow2 option " | |
784 | "'overlap-check'. Allowed are either of the following: " | |
785 | "none, constant, cached, all", opt_overlap_check); | |
786 | qemu_opts_del(opts); | |
787 | ret = -EINVAL; | |
788 | goto fail; | |
789 | } | |
790 | ||
791 | s->overlap_check = 0; | |
792 | for (i = 0; i < QCOW2_OL_MAX_BITNR; i++) { | |
793 | /* overlap-check defines a template bitmask, but every flag may be | |
794 | * overwritten through the associated boolean option */ | |
795 | s->overlap_check |= | |
796 | qemu_opt_get_bool(opts, overlap_bool_option_names[i], | |
797 | overlap_check_template & (1 << i)) << i; | |
798 | } | |
3e355390 | 799 | |
74c4510a KW |
800 | qemu_opts_del(opts); |
801 | ||
802 | if (s->use_lazy_refcounts && s->qcow_version < 3) { | |
3ef6c40a HR |
803 | error_setg(errp, "Lazy refcounts require a qcow2 image with at least " |
804 | "qemu 1.1 compatibility level"); | |
74c4510a KW |
805 | ret = -EINVAL; |
806 | goto fail; | |
807 | } | |
808 | ||
585f8587 | 809 | #ifdef DEBUG_ALLOC |
6cbc3031 PH |
810 | { |
811 | BdrvCheckResult result = {0}; | |
b35278f7 | 812 | qcow2_check_refcounts(bs, &result, 0); |
6cbc3031 | 813 | } |
585f8587 | 814 | #endif |
6d85a57e | 815 | return ret; |
585f8587 FB |
816 | |
817 | fail: | |
6744cbab | 818 | g_free(s->unknown_header_fields); |
75bab85c | 819 | cleanup_unknown_header_ext(bs); |
ed6ccf0f KW |
820 | qcow2_free_snapshots(bs); |
821 | qcow2_refcount_close(bs); | |
7267c094 | 822 | g_free(s->l1_table); |
cf93980e HR |
823 | /* else pre-write overlap checks in cache_destroy may crash */ |
824 | s->l1_table = NULL; | |
29c1a730 KW |
825 | if (s->l2_table_cache) { |
826 | qcow2_cache_destroy(bs, s->l2_table_cache); | |
827 | } | |
c5a33ee9 PJ |
828 | if (s->refcount_block_cache) { |
829 | qcow2_cache_destroy(bs, s->refcount_block_cache); | |
830 | } | |
7267c094 | 831 | g_free(s->cluster_cache); |
dea43a65 | 832 | qemu_vfree(s->cluster_data); |
6d85a57e | 833 | return ret; |
585f8587 FB |
834 | } |
835 | ||
d34682cd KW |
836 | static int qcow2_refresh_limits(BlockDriverState *bs) |
837 | { | |
838 | BDRVQcowState *s = bs->opaque; | |
839 | ||
840 | bs->bl.write_zeroes_alignment = s->cluster_sectors; | |
841 | ||
842 | return 0; | |
843 | } | |
844 | ||
7c80ab3f | 845 | static int qcow2_set_key(BlockDriverState *bs, const char *key) |
585f8587 FB |
846 | { |
847 | BDRVQcowState *s = bs->opaque; | |
848 | uint8_t keybuf[16]; | |
849 | int len, i; | |
3b46e624 | 850 | |
585f8587 FB |
851 | memset(keybuf, 0, 16); |
852 | len = strlen(key); | |
853 | if (len > 16) | |
854 | len = 16; | |
855 | /* XXX: we could compress the chars to 7 bits to increase | |
856 | entropy */ | |
857 | for(i = 0;i < len;i++) { | |
858 | keybuf[i] = key[i]; | |
859 | } | |
860 | s->crypt_method = s->crypt_method_header; | |
861 | ||
862 | if (AES_set_encrypt_key(keybuf, 128, &s->aes_encrypt_key) != 0) | |
863 | return -1; | |
864 | if (AES_set_decrypt_key(keybuf, 128, &s->aes_decrypt_key) != 0) | |
865 | return -1; | |
866 | #if 0 | |
867 | /* test */ | |
868 | { | |
869 | uint8_t in[16]; | |
870 | uint8_t out[16]; | |
871 | uint8_t tmp[16]; | |
872 | for(i=0;i<16;i++) | |
873 | in[i] = i; | |
874 | AES_encrypt(in, tmp, &s->aes_encrypt_key); | |
875 | AES_decrypt(tmp, out, &s->aes_decrypt_key); | |
876 | for(i = 0; i < 16; i++) | |
877 | printf(" %02x", tmp[i]); | |
878 | printf("\n"); | |
879 | for(i = 0; i < 16; i++) | |
880 | printf(" %02x", out[i]); | |
881 | printf("\n"); | |
882 | } | |
883 | #endif | |
884 | return 0; | |
885 | } | |
886 | ||
21d82ac9 JC |
887 | /* We have nothing to do for QCOW2 reopen, stubs just return |
888 | * success */ | |
889 | static int qcow2_reopen_prepare(BDRVReopenState *state, | |
890 | BlockReopenQueue *queue, Error **errp) | |
891 | { | |
892 | return 0; | |
893 | } | |
894 | ||
b6b8a333 | 895 | static int64_t coroutine_fn qcow2_co_get_block_status(BlockDriverState *bs, |
f8a2e5e3 | 896 | int64_t sector_num, int nb_sectors, int *pnum) |
585f8587 | 897 | { |
f8a2e5e3 | 898 | BDRVQcowState *s = bs->opaque; |
585f8587 | 899 | uint64_t cluster_offset; |
4bc74be9 PB |
900 | int index_in_cluster, ret; |
901 | int64_t status = 0; | |
585f8587 | 902 | |
095a9c58 | 903 | *pnum = nb_sectors; |
f8a2e5e3 | 904 | qemu_co_mutex_lock(&s->lock); |
1c46efaa | 905 | ret = qcow2_get_cluster_offset(bs, sector_num << 9, pnum, &cluster_offset); |
f8a2e5e3 | 906 | qemu_co_mutex_unlock(&s->lock); |
1c46efaa | 907 | if (ret < 0) { |
d663640c | 908 | return ret; |
1c46efaa | 909 | } |
095a9c58 | 910 | |
4bc74be9 PB |
911 | if (cluster_offset != 0 && ret != QCOW2_CLUSTER_COMPRESSED && |
912 | !s->crypt_method) { | |
913 | index_in_cluster = sector_num & (s->cluster_sectors - 1); | |
914 | cluster_offset |= (index_in_cluster << BDRV_SECTOR_BITS); | |
915 | status |= BDRV_BLOCK_OFFSET_VALID | cluster_offset; | |
916 | } | |
917 | if (ret == QCOW2_CLUSTER_ZERO) { | |
918 | status |= BDRV_BLOCK_ZERO; | |
919 | } else if (ret != QCOW2_CLUSTER_UNALLOCATED) { | |
920 | status |= BDRV_BLOCK_DATA; | |
921 | } | |
922 | return status; | |
585f8587 FB |
923 | } |
924 | ||
a9465922 | 925 | /* handle reading after the end of the backing file */ |
bd28f835 KW |
926 | int qcow2_backing_read1(BlockDriverState *bs, QEMUIOVector *qiov, |
927 | int64_t sector_num, int nb_sectors) | |
a9465922 FB |
928 | { |
929 | int n1; | |
930 | if ((sector_num + nb_sectors) <= bs->total_sectors) | |
931 | return nb_sectors; | |
932 | if (sector_num >= bs->total_sectors) | |
933 | n1 = 0; | |
934 | else | |
935 | n1 = bs->total_sectors - sector_num; | |
bd28f835 | 936 | |
3d9b4925 | 937 | qemu_iovec_memset(qiov, 512 * n1, 0, 512 * (nb_sectors - n1)); |
bd28f835 | 938 | |
a9465922 FB |
939 | return n1; |
940 | } | |
941 | ||
a968168c | 942 | static coroutine_fn int qcow2_co_readv(BlockDriverState *bs, int64_t sector_num, |
3fc48d09 | 943 | int remaining_sectors, QEMUIOVector *qiov) |
585f8587 | 944 | { |
585f8587 | 945 | BDRVQcowState *s = bs->opaque; |
a9465922 | 946 | int index_in_cluster, n1; |
68d100e9 | 947 | int ret; |
faf575c1 | 948 | int cur_nr_sectors; /* number of sectors in current iteration */ |
c2bdd990 | 949 | uint64_t cluster_offset = 0; |
3fc48d09 FZ |
950 | uint64_t bytes_done = 0; |
951 | QEMUIOVector hd_qiov; | |
952 | uint8_t *cluster_data = NULL; | |
585f8587 | 953 | |
3fc48d09 FZ |
954 | qemu_iovec_init(&hd_qiov, qiov->niov); |
955 | ||
956 | qemu_co_mutex_lock(&s->lock); | |
957 | ||
958 | while (remaining_sectors != 0) { | |
bd28f835 | 959 | |
5ebaa27e | 960 | /* prepare next request */ |
3fc48d09 | 961 | cur_nr_sectors = remaining_sectors; |
5ebaa27e FZ |
962 | if (s->crypt_method) { |
963 | cur_nr_sectors = MIN(cur_nr_sectors, | |
964 | QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors); | |
585f8587 | 965 | } |
5ebaa27e | 966 | |
3fc48d09 | 967 | ret = qcow2_get_cluster_offset(bs, sector_num << 9, |
5ebaa27e | 968 | &cur_nr_sectors, &cluster_offset); |
8af36488 | 969 | if (ret < 0) { |
3fc48d09 | 970 | goto fail; |
8af36488 | 971 | } |
bd28f835 | 972 | |
3fc48d09 | 973 | index_in_cluster = sector_num & (s->cluster_sectors - 1); |
c87c0672 | 974 | |
3fc48d09 | 975 | qemu_iovec_reset(&hd_qiov); |
1b093c48 | 976 | qemu_iovec_concat(&hd_qiov, qiov, bytes_done, |
5ebaa27e FZ |
977 | cur_nr_sectors * 512); |
978 | ||
68d000a3 KW |
979 | switch (ret) { |
980 | case QCOW2_CLUSTER_UNALLOCATED: | |
5ebaa27e FZ |
981 | |
982 | if (bs->backing_hd) { | |
983 | /* read from the base image */ | |
3fc48d09 FZ |
984 | n1 = qcow2_backing_read1(bs->backing_hd, &hd_qiov, |
985 | sector_num, cur_nr_sectors); | |
5ebaa27e FZ |
986 | if (n1 > 0) { |
987 | BLKDBG_EVENT(bs->file, BLKDBG_READ_BACKING_AIO); | |
988 | qemu_co_mutex_unlock(&s->lock); | |
3fc48d09 FZ |
989 | ret = bdrv_co_readv(bs->backing_hd, sector_num, |
990 | n1, &hd_qiov); | |
5ebaa27e FZ |
991 | qemu_co_mutex_lock(&s->lock); |
992 | if (ret < 0) { | |
3fc48d09 | 993 | goto fail; |
5ebaa27e FZ |
994 | } |
995 | } | |
996 | } else { | |
997 | /* Note: in this case, no need to wait */ | |
3d9b4925 | 998 | qemu_iovec_memset(&hd_qiov, 0, 0, 512 * cur_nr_sectors); |
5ebaa27e | 999 | } |
68d000a3 KW |
1000 | break; |
1001 | ||
6377af48 | 1002 | case QCOW2_CLUSTER_ZERO: |
3d9b4925 | 1003 | qemu_iovec_memset(&hd_qiov, 0, 0, 512 * cur_nr_sectors); |
6377af48 KW |
1004 | break; |
1005 | ||
68d000a3 | 1006 | case QCOW2_CLUSTER_COMPRESSED: |
5ebaa27e FZ |
1007 | /* add AIO support for compressed blocks ? */ |
1008 | ret = qcow2_decompress_cluster(bs, cluster_offset); | |
1009 | if (ret < 0) { | |
3fc48d09 | 1010 | goto fail; |
bd28f835 KW |
1011 | } |
1012 | ||
03396148 | 1013 | qemu_iovec_from_buf(&hd_qiov, 0, |
5ebaa27e | 1014 | s->cluster_cache + index_in_cluster * 512, |
faf575c1 | 1015 | 512 * cur_nr_sectors); |
68d000a3 KW |
1016 | break; |
1017 | ||
1018 | case QCOW2_CLUSTER_NORMAL: | |
5ebaa27e | 1019 | if ((cluster_offset & 511) != 0) { |
3fc48d09 FZ |
1020 | ret = -EIO; |
1021 | goto fail; | |
5ebaa27e | 1022 | } |
bd28f835 | 1023 | |
5ebaa27e FZ |
1024 | if (s->crypt_method) { |
1025 | /* | |
1026 | * For encrypted images, read everything into a temporary | |
1027 | * contiguous buffer on which the AES functions can work. | |
1028 | */ | |
3fc48d09 FZ |
1029 | if (!cluster_data) { |
1030 | cluster_data = | |
dea43a65 | 1031 | qemu_blockalign(bs, QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size); |
5ebaa27e FZ |
1032 | } |
1033 | ||
1034 | assert(cur_nr_sectors <= | |
1035 | QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors); | |
3fc48d09 FZ |
1036 | qemu_iovec_reset(&hd_qiov); |
1037 | qemu_iovec_add(&hd_qiov, cluster_data, | |
5ebaa27e FZ |
1038 | 512 * cur_nr_sectors); |
1039 | } | |
1040 | ||
1041 | BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO); | |
1042 | qemu_co_mutex_unlock(&s->lock); | |
1043 | ret = bdrv_co_readv(bs->file, | |
1044 | (cluster_offset >> 9) + index_in_cluster, | |
3fc48d09 | 1045 | cur_nr_sectors, &hd_qiov); |
5ebaa27e FZ |
1046 | qemu_co_mutex_lock(&s->lock); |
1047 | if (ret < 0) { | |
3fc48d09 | 1048 | goto fail; |
5ebaa27e FZ |
1049 | } |
1050 | if (s->crypt_method) { | |
3fc48d09 FZ |
1051 | qcow2_encrypt_sectors(s, sector_num, cluster_data, |
1052 | cluster_data, cur_nr_sectors, 0, &s->aes_decrypt_key); | |
03396148 MT |
1053 | qemu_iovec_from_buf(qiov, bytes_done, |
1054 | cluster_data, 512 * cur_nr_sectors); | |
5ebaa27e | 1055 | } |
68d000a3 KW |
1056 | break; |
1057 | ||
1058 | default: | |
1059 | g_assert_not_reached(); | |
1060 | ret = -EIO; | |
1061 | goto fail; | |
faf575c1 | 1062 | } |
f141eafe | 1063 | |
3fc48d09 FZ |
1064 | remaining_sectors -= cur_nr_sectors; |
1065 | sector_num += cur_nr_sectors; | |
1066 | bytes_done += cur_nr_sectors * 512; | |
5ebaa27e | 1067 | } |
3fc48d09 | 1068 | ret = 0; |
faf575c1 | 1069 | |
3fc48d09 | 1070 | fail: |
68d100e9 | 1071 | qemu_co_mutex_unlock(&s->lock); |
42496d62 | 1072 | |
3fc48d09 | 1073 | qemu_iovec_destroy(&hd_qiov); |
dea43a65 | 1074 | qemu_vfree(cluster_data); |
68d100e9 KW |
1075 | |
1076 | return ret; | |
585f8587 FB |
1077 | } |
1078 | ||
a968168c | 1079 | static coroutine_fn int qcow2_co_writev(BlockDriverState *bs, |
3fc48d09 FZ |
1080 | int64_t sector_num, |
1081 | int remaining_sectors, | |
1082 | QEMUIOVector *qiov) | |
585f8587 | 1083 | { |
585f8587 | 1084 | BDRVQcowState *s = bs->opaque; |
585f8587 | 1085 | int index_in_cluster; |
68d100e9 | 1086 | int ret; |
faf575c1 | 1087 | int cur_nr_sectors; /* number of sectors in current iteration */ |
c2bdd990 | 1088 | uint64_t cluster_offset; |
3fc48d09 FZ |
1089 | QEMUIOVector hd_qiov; |
1090 | uint64_t bytes_done = 0; | |
1091 | uint8_t *cluster_data = NULL; | |
8d2497c3 | 1092 | QCowL2Meta *l2meta = NULL; |
c2271403 | 1093 | |
3cce16f4 KW |
1094 | trace_qcow2_writev_start_req(qemu_coroutine_self(), sector_num, |
1095 | remaining_sectors); | |
1096 | ||
3fc48d09 FZ |
1097 | qemu_iovec_init(&hd_qiov, qiov->niov); |
1098 | ||
1099 | s->cluster_cache_offset = -1; /* disable compressed cache */ | |
3b46e624 | 1100 | |
3fc48d09 FZ |
1101 | qemu_co_mutex_lock(&s->lock); |
1102 | ||
1103 | while (remaining_sectors != 0) { | |
1104 | ||
f50f88b9 | 1105 | l2meta = NULL; |
cf5c1a23 | 1106 | |
3cce16f4 | 1107 | trace_qcow2_writev_start_part(qemu_coroutine_self()); |
3fc48d09 | 1108 | index_in_cluster = sector_num & (s->cluster_sectors - 1); |
16f0587e | 1109 | cur_nr_sectors = remaining_sectors; |
5ebaa27e | 1110 | if (s->crypt_method && |
16f0587e HT |
1111 | cur_nr_sectors > |
1112 | QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors - index_in_cluster) { | |
1113 | cur_nr_sectors = | |
1114 | QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors - index_in_cluster; | |
5ebaa27e | 1115 | } |
095a9c58 | 1116 | |
3fc48d09 | 1117 | ret = qcow2_alloc_cluster_offset(bs, sector_num << 9, |
16f0587e | 1118 | &cur_nr_sectors, &cluster_offset, &l2meta); |
5ebaa27e | 1119 | if (ret < 0) { |
3fc48d09 | 1120 | goto fail; |
5ebaa27e | 1121 | } |
148da7ea | 1122 | |
5ebaa27e | 1123 | assert((cluster_offset & 511) == 0); |
148da7ea | 1124 | |
3fc48d09 | 1125 | qemu_iovec_reset(&hd_qiov); |
1b093c48 | 1126 | qemu_iovec_concat(&hd_qiov, qiov, bytes_done, |
5ebaa27e | 1127 | cur_nr_sectors * 512); |
6f5f060b | 1128 | |
5ebaa27e | 1129 | if (s->crypt_method) { |
3fc48d09 | 1130 | if (!cluster_data) { |
dea43a65 | 1131 | cluster_data = qemu_blockalign(bs, QCOW_MAX_CRYPT_CLUSTERS * |
5ebaa27e FZ |
1132 | s->cluster_size); |
1133 | } | |
6f5f060b | 1134 | |
3fc48d09 | 1135 | assert(hd_qiov.size <= |
5ebaa27e | 1136 | QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size); |
d5e6b161 | 1137 | qemu_iovec_to_buf(&hd_qiov, 0, cluster_data, hd_qiov.size); |
6f5f060b | 1138 | |
3fc48d09 FZ |
1139 | qcow2_encrypt_sectors(s, sector_num, cluster_data, |
1140 | cluster_data, cur_nr_sectors, 1, &s->aes_encrypt_key); | |
6f5f060b | 1141 | |
3fc48d09 FZ |
1142 | qemu_iovec_reset(&hd_qiov); |
1143 | qemu_iovec_add(&hd_qiov, cluster_data, | |
5ebaa27e FZ |
1144 | cur_nr_sectors * 512); |
1145 | } | |
6f5f060b | 1146 | |
231bb267 | 1147 | ret = qcow2_pre_write_overlap_check(bs, 0, |
cf93980e HR |
1148 | cluster_offset + index_in_cluster * BDRV_SECTOR_SIZE, |
1149 | cur_nr_sectors * BDRV_SECTOR_SIZE); | |
1150 | if (ret < 0) { | |
1151 | goto fail; | |
1152 | } | |
1153 | ||
5ebaa27e | 1154 | qemu_co_mutex_unlock(&s->lock); |
67a7a0eb | 1155 | BLKDBG_EVENT(bs->file, BLKDBG_WRITE_AIO); |
3cce16f4 KW |
1156 | trace_qcow2_writev_data(qemu_coroutine_self(), |
1157 | (cluster_offset >> 9) + index_in_cluster); | |
5ebaa27e FZ |
1158 | ret = bdrv_co_writev(bs->file, |
1159 | (cluster_offset >> 9) + index_in_cluster, | |
3fc48d09 | 1160 | cur_nr_sectors, &hd_qiov); |
5ebaa27e FZ |
1161 | qemu_co_mutex_lock(&s->lock); |
1162 | if (ret < 0) { | |
3fc48d09 | 1163 | goto fail; |
5ebaa27e | 1164 | } |
f141eafe | 1165 | |
88c6588c KW |
1166 | while (l2meta != NULL) { |
1167 | QCowL2Meta *next; | |
1168 | ||
f50f88b9 KW |
1169 | ret = qcow2_alloc_cluster_link_l2(bs, l2meta); |
1170 | if (ret < 0) { | |
1171 | goto fail; | |
1172 | } | |
faf575c1 | 1173 | |
4e95314e KW |
1174 | /* Take the request off the list of running requests */ |
1175 | if (l2meta->nb_clusters != 0) { | |
1176 | QLIST_REMOVE(l2meta, next_in_flight); | |
1177 | } | |
1178 | ||
4e95314e | 1179 | qemu_co_queue_restart_all(&l2meta->dependent_requests); |
4e95314e | 1180 | |
88c6588c | 1181 | next = l2meta->next; |
f50f88b9 | 1182 | g_free(l2meta); |
88c6588c | 1183 | l2meta = next; |
f50f88b9 | 1184 | } |
0fa9131a | 1185 | |
3fc48d09 FZ |
1186 | remaining_sectors -= cur_nr_sectors; |
1187 | sector_num += cur_nr_sectors; | |
1188 | bytes_done += cur_nr_sectors * 512; | |
3cce16f4 | 1189 | trace_qcow2_writev_done_part(qemu_coroutine_self(), cur_nr_sectors); |
5ebaa27e | 1190 | } |
3fc48d09 | 1191 | ret = 0; |
faf575c1 | 1192 | |
3fc48d09 | 1193 | fail: |
4e95314e KW |
1194 | qemu_co_mutex_unlock(&s->lock); |
1195 | ||
88c6588c KW |
1196 | while (l2meta != NULL) { |
1197 | QCowL2Meta *next; | |
1198 | ||
4e95314e KW |
1199 | if (l2meta->nb_clusters != 0) { |
1200 | QLIST_REMOVE(l2meta, next_in_flight); | |
1201 | } | |
1202 | qemu_co_queue_restart_all(&l2meta->dependent_requests); | |
88c6588c KW |
1203 | |
1204 | next = l2meta->next; | |
cf5c1a23 | 1205 | g_free(l2meta); |
88c6588c | 1206 | l2meta = next; |
cf5c1a23 | 1207 | } |
0fa9131a | 1208 | |
3fc48d09 | 1209 | qemu_iovec_destroy(&hd_qiov); |
dea43a65 | 1210 | qemu_vfree(cluster_data); |
3cce16f4 | 1211 | trace_qcow2_writev_done_req(qemu_coroutine_self(), ret); |
42496d62 | 1212 | |
68d100e9 | 1213 | return ret; |
585f8587 FB |
1214 | } |
1215 | ||
7c80ab3f | 1216 | static void qcow2_close(BlockDriverState *bs) |
585f8587 FB |
1217 | { |
1218 | BDRVQcowState *s = bs->opaque; | |
7267c094 | 1219 | g_free(s->l1_table); |
cf93980e HR |
1220 | /* else pre-write overlap checks in cache_destroy may crash */ |
1221 | s->l1_table = NULL; | |
29c1a730 | 1222 | |
27eb6c09 KW |
1223 | if (!(bs->open_flags & BDRV_O_INCOMING)) { |
1224 | qcow2_cache_flush(bs, s->l2_table_cache); | |
1225 | qcow2_cache_flush(bs, s->refcount_block_cache); | |
29c1a730 | 1226 | |
27eb6c09 KW |
1227 | qcow2_mark_clean(bs); |
1228 | } | |
c61d0004 | 1229 | |
29c1a730 KW |
1230 | qcow2_cache_destroy(bs, s->l2_table_cache); |
1231 | qcow2_cache_destroy(bs, s->refcount_block_cache); | |
1232 | ||
6744cbab | 1233 | g_free(s->unknown_header_fields); |
75bab85c | 1234 | cleanup_unknown_header_ext(bs); |
6744cbab | 1235 | |
7267c094 | 1236 | g_free(s->cluster_cache); |
dea43a65 | 1237 | qemu_vfree(s->cluster_data); |
ed6ccf0f | 1238 | qcow2_refcount_close(bs); |
28c1202b | 1239 | qcow2_free_snapshots(bs); |
585f8587 FB |
1240 | } |
1241 | ||
5a8a30db | 1242 | static void qcow2_invalidate_cache(BlockDriverState *bs, Error **errp) |
06d9260f AL |
1243 | { |
1244 | BDRVQcowState *s = bs->opaque; | |
1245 | int flags = s->flags; | |
1246 | AES_KEY aes_encrypt_key; | |
1247 | AES_KEY aes_decrypt_key; | |
1248 | uint32_t crypt_method = 0; | |
acdfb480 | 1249 | QDict *options; |
5a8a30db KW |
1250 | Error *local_err = NULL; |
1251 | int ret; | |
06d9260f AL |
1252 | |
1253 | /* | |
1254 | * Backing files are read-only which makes all of their metadata immutable, | |
1255 | * that means we don't have to worry about reopening them here. | |
1256 | */ | |
1257 | ||
1258 | if (s->crypt_method) { | |
1259 | crypt_method = s->crypt_method; | |
1260 | memcpy(&aes_encrypt_key, &s->aes_encrypt_key, sizeof(aes_encrypt_key)); | |
1261 | memcpy(&aes_decrypt_key, &s->aes_decrypt_key, sizeof(aes_decrypt_key)); | |
1262 | } | |
1263 | ||
1264 | qcow2_close(bs); | |
1265 | ||
5a8a30db KW |
1266 | bdrv_invalidate_cache(bs->file, &local_err); |
1267 | if (local_err) { | |
1268 | error_propagate(errp, local_err); | |
1269 | return; | |
1270 | } | |
3456a8d1 | 1271 | |
06d9260f | 1272 | memset(s, 0, sizeof(BDRVQcowState)); |
d475e5ac | 1273 | options = qdict_clone_shallow(bs->options); |
5a8a30db KW |
1274 | |
1275 | ret = qcow2_open(bs, options, flags, &local_err); | |
1276 | if (local_err) { | |
1277 | error_setg(errp, "Could not reopen qcow2 layer: %s", | |
1278 | error_get_pretty(local_err)); | |
1279 | error_free(local_err); | |
1280 | return; | |
1281 | } else if (ret < 0) { | |
1282 | error_setg_errno(errp, -ret, "Could not reopen qcow2 layer"); | |
1283 | return; | |
1284 | } | |
acdfb480 KW |
1285 | |
1286 | QDECREF(options); | |
06d9260f AL |
1287 | |
1288 | if (crypt_method) { | |
1289 | s->crypt_method = crypt_method; | |
1290 | memcpy(&s->aes_encrypt_key, &aes_encrypt_key, sizeof(aes_encrypt_key)); | |
1291 | memcpy(&s->aes_decrypt_key, &aes_decrypt_key, sizeof(aes_decrypt_key)); | |
1292 | } | |
1293 | } | |
1294 | ||
e24e49e6 KW |
1295 | static size_t header_ext_add(char *buf, uint32_t magic, const void *s, |
1296 | size_t len, size_t buflen) | |
1297 | { | |
1298 | QCowExtension *ext_backing_fmt = (QCowExtension*) buf; | |
1299 | size_t ext_len = sizeof(QCowExtension) + ((len + 7) & ~7); | |
1300 | ||
1301 | if (buflen < ext_len) { | |
1302 | return -ENOSPC; | |
1303 | } | |
1304 | ||
1305 | *ext_backing_fmt = (QCowExtension) { | |
1306 | .magic = cpu_to_be32(magic), | |
1307 | .len = cpu_to_be32(len), | |
1308 | }; | |
1309 | memcpy(buf + sizeof(QCowExtension), s, len); | |
1310 | ||
1311 | return ext_len; | |
1312 | } | |
1313 | ||
756e6736 | 1314 | /* |
e24e49e6 KW |
1315 | * Updates the qcow2 header, including the variable length parts of it, i.e. |
1316 | * the backing file name and all extensions. qcow2 was not designed to allow | |
1317 | * such changes, so if we run out of space (we can only use the first cluster) | |
1318 | * this function may fail. | |
756e6736 KW |
1319 | * |
1320 | * Returns 0 on success, -errno in error cases. | |
1321 | */ | |
e24e49e6 | 1322 | int qcow2_update_header(BlockDriverState *bs) |
756e6736 | 1323 | { |
756e6736 | 1324 | BDRVQcowState *s = bs->opaque; |
e24e49e6 KW |
1325 | QCowHeader *header; |
1326 | char *buf; | |
1327 | size_t buflen = s->cluster_size; | |
756e6736 | 1328 | int ret; |
e24e49e6 KW |
1329 | uint64_t total_size; |
1330 | uint32_t refcount_table_clusters; | |
6744cbab | 1331 | size_t header_length; |
75bab85c | 1332 | Qcow2UnknownHeaderExtension *uext; |
756e6736 | 1333 | |
e24e49e6 | 1334 | buf = qemu_blockalign(bs, buflen); |
756e6736 | 1335 | |
e24e49e6 KW |
1336 | /* Header structure */ |
1337 | header = (QCowHeader*) buf; | |
756e6736 | 1338 | |
e24e49e6 KW |
1339 | if (buflen < sizeof(*header)) { |
1340 | ret = -ENOSPC; | |
1341 | goto fail; | |
756e6736 KW |
1342 | } |
1343 | ||
6744cbab | 1344 | header_length = sizeof(*header) + s->unknown_header_fields_size; |
e24e49e6 KW |
1345 | total_size = bs->total_sectors * BDRV_SECTOR_SIZE; |
1346 | refcount_table_clusters = s->refcount_table_size >> (s->cluster_bits - 3); | |
1347 | ||
1348 | *header = (QCowHeader) { | |
6744cbab | 1349 | /* Version 2 fields */ |
e24e49e6 | 1350 | .magic = cpu_to_be32(QCOW_MAGIC), |
6744cbab | 1351 | .version = cpu_to_be32(s->qcow_version), |
e24e49e6 KW |
1352 | .backing_file_offset = 0, |
1353 | .backing_file_size = 0, | |
1354 | .cluster_bits = cpu_to_be32(s->cluster_bits), | |
1355 | .size = cpu_to_be64(total_size), | |
1356 | .crypt_method = cpu_to_be32(s->crypt_method_header), | |
1357 | .l1_size = cpu_to_be32(s->l1_size), | |
1358 | .l1_table_offset = cpu_to_be64(s->l1_table_offset), | |
1359 | .refcount_table_offset = cpu_to_be64(s->refcount_table_offset), | |
1360 | .refcount_table_clusters = cpu_to_be32(refcount_table_clusters), | |
1361 | .nb_snapshots = cpu_to_be32(s->nb_snapshots), | |
1362 | .snapshots_offset = cpu_to_be64(s->snapshots_offset), | |
6744cbab KW |
1363 | |
1364 | /* Version 3 fields */ | |
1365 | .incompatible_features = cpu_to_be64(s->incompatible_features), | |
1366 | .compatible_features = cpu_to_be64(s->compatible_features), | |
1367 | .autoclear_features = cpu_to_be64(s->autoclear_features), | |
b6481f37 | 1368 | .refcount_order = cpu_to_be32(s->refcount_order), |
6744cbab | 1369 | .header_length = cpu_to_be32(header_length), |
e24e49e6 | 1370 | }; |
756e6736 | 1371 | |
6744cbab KW |
1372 | /* For older versions, write a shorter header */ |
1373 | switch (s->qcow_version) { | |
1374 | case 2: | |
1375 | ret = offsetof(QCowHeader, incompatible_features); | |
1376 | break; | |
1377 | case 3: | |
1378 | ret = sizeof(*header); | |
1379 | break; | |
1380 | default: | |
b6c14762 JM |
1381 | ret = -EINVAL; |
1382 | goto fail; | |
6744cbab KW |
1383 | } |
1384 | ||
1385 | buf += ret; | |
1386 | buflen -= ret; | |
1387 | memset(buf, 0, buflen); | |
1388 | ||
1389 | /* Preserve any unknown field in the header */ | |
1390 | if (s->unknown_header_fields_size) { | |
1391 | if (buflen < s->unknown_header_fields_size) { | |
1392 | ret = -ENOSPC; | |
1393 | goto fail; | |
1394 | } | |
1395 | ||
1396 | memcpy(buf, s->unknown_header_fields, s->unknown_header_fields_size); | |
1397 | buf += s->unknown_header_fields_size; | |
1398 | buflen -= s->unknown_header_fields_size; | |
1399 | } | |
756e6736 | 1400 | |
e24e49e6 KW |
1401 | /* Backing file format header extension */ |
1402 | if (*bs->backing_format) { | |
1403 | ret = header_ext_add(buf, QCOW2_EXT_MAGIC_BACKING_FORMAT, | |
1404 | bs->backing_format, strlen(bs->backing_format), | |
1405 | buflen); | |
1406 | if (ret < 0) { | |
1407 | goto fail; | |
756e6736 KW |
1408 | } |
1409 | ||
e24e49e6 KW |
1410 | buf += ret; |
1411 | buflen -= ret; | |
756e6736 KW |
1412 | } |
1413 | ||
cfcc4c62 KW |
1414 | /* Feature table */ |
1415 | Qcow2Feature features[] = { | |
c61d0004 SH |
1416 | { |
1417 | .type = QCOW2_FEAT_TYPE_INCOMPATIBLE, | |
1418 | .bit = QCOW2_INCOMPAT_DIRTY_BITNR, | |
1419 | .name = "dirty bit", | |
1420 | }, | |
69c98726 HR |
1421 | { |
1422 | .type = QCOW2_FEAT_TYPE_INCOMPATIBLE, | |
1423 | .bit = QCOW2_INCOMPAT_CORRUPT_BITNR, | |
1424 | .name = "corrupt bit", | |
1425 | }, | |
bfe8043e SH |
1426 | { |
1427 | .type = QCOW2_FEAT_TYPE_COMPATIBLE, | |
1428 | .bit = QCOW2_COMPAT_LAZY_REFCOUNTS_BITNR, | |
1429 | .name = "lazy refcounts", | |
1430 | }, | |
cfcc4c62 KW |
1431 | }; |
1432 | ||
1433 | ret = header_ext_add(buf, QCOW2_EXT_MAGIC_FEATURE_TABLE, | |
1434 | features, sizeof(features), buflen); | |
1435 | if (ret < 0) { | |
1436 | goto fail; | |
1437 | } | |
1438 | buf += ret; | |
1439 | buflen -= ret; | |
1440 | ||
75bab85c KW |
1441 | /* Keep unknown header extensions */ |
1442 | QLIST_FOREACH(uext, &s->unknown_header_ext, next) { | |
1443 | ret = header_ext_add(buf, uext->magic, uext->data, uext->len, buflen); | |
1444 | if (ret < 0) { | |
1445 | goto fail; | |
1446 | } | |
1447 | ||
1448 | buf += ret; | |
1449 | buflen -= ret; | |
1450 | } | |
1451 | ||
e24e49e6 KW |
1452 | /* End of header extensions */ |
1453 | ret = header_ext_add(buf, QCOW2_EXT_MAGIC_END, NULL, 0, buflen); | |
756e6736 KW |
1454 | if (ret < 0) { |
1455 | goto fail; | |
1456 | } | |
1457 | ||
e24e49e6 KW |
1458 | buf += ret; |
1459 | buflen -= ret; | |
756e6736 | 1460 | |
e24e49e6 KW |
1461 | /* Backing file name */ |
1462 | if (*bs->backing_file) { | |
1463 | size_t backing_file_len = strlen(bs->backing_file); | |
1464 | ||
1465 | if (buflen < backing_file_len) { | |
1466 | ret = -ENOSPC; | |
1467 | goto fail; | |
1468 | } | |
1469 | ||
00ea1881 | 1470 | /* Using strncpy is ok here, since buf is not NUL-terminated. */ |
e24e49e6 KW |
1471 | strncpy(buf, bs->backing_file, buflen); |
1472 | ||
1473 | header->backing_file_offset = cpu_to_be64(buf - ((char*) header)); | |
1474 | header->backing_file_size = cpu_to_be32(backing_file_len); | |
756e6736 KW |
1475 | } |
1476 | ||
e24e49e6 KW |
1477 | /* Write the new header */ |
1478 | ret = bdrv_pwrite(bs->file, 0, header, s->cluster_size); | |
756e6736 KW |
1479 | if (ret < 0) { |
1480 | goto fail; | |
1481 | } | |
1482 | ||
1483 | ret = 0; | |
1484 | fail: | |
e24e49e6 | 1485 | qemu_vfree(header); |
756e6736 KW |
1486 | return ret; |
1487 | } | |
1488 | ||
1489 | static int qcow2_change_backing_file(BlockDriverState *bs, | |
1490 | const char *backing_file, const char *backing_fmt) | |
1491 | { | |
e24e49e6 KW |
1492 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: ""); |
1493 | pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: ""); | |
1494 | ||
1495 | return qcow2_update_header(bs); | |
756e6736 KW |
1496 | } |
1497 | ||
a35e1c17 KW |
1498 | static int preallocate(BlockDriverState *bs) |
1499 | { | |
a35e1c17 KW |
1500 | uint64_t nb_sectors; |
1501 | uint64_t offset; | |
060bee89 | 1502 | uint64_t host_offset = 0; |
a35e1c17 | 1503 | int num; |
148da7ea | 1504 | int ret; |
f50f88b9 | 1505 | QCowL2Meta *meta; |
a35e1c17 | 1506 | |
7c2bbf4a | 1507 | nb_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
a35e1c17 KW |
1508 | offset = 0; |
1509 | ||
1510 | while (nb_sectors) { | |
7c2bbf4a | 1511 | num = MIN(nb_sectors, INT_MAX >> BDRV_SECTOR_BITS); |
16f0587e | 1512 | ret = qcow2_alloc_cluster_offset(bs, offset, &num, |
060bee89 | 1513 | &host_offset, &meta); |
148da7ea | 1514 | if (ret < 0) { |
19dbcbf7 | 1515 | return ret; |
a35e1c17 KW |
1516 | } |
1517 | ||
f50f88b9 | 1518 | if (meta != NULL) { |
7c2bbf4a HT |
1519 | ret = qcow2_alloc_cluster_link_l2(bs, meta); |
1520 | if (ret < 0) { | |
1521 | qcow2_free_any_clusters(bs, meta->alloc_offset, | |
1522 | meta->nb_clusters, QCOW2_DISCARD_NEVER); | |
1523 | return ret; | |
1524 | } | |
1525 | ||
1526 | /* There are no dependent requests, but we need to remove our | |
1527 | * request from the list of in-flight requests */ | |
4e95314e | 1528 | QLIST_REMOVE(meta, next_in_flight); |
f50f88b9 | 1529 | } |
f214978a | 1530 | |
a35e1c17 KW |
1531 | /* TODO Preallocate data if requested */ |
1532 | ||
1533 | nb_sectors -= num; | |
7c2bbf4a | 1534 | offset += num << BDRV_SECTOR_BITS; |
a35e1c17 KW |
1535 | } |
1536 | ||
1537 | /* | |
1538 | * It is expected that the image file is large enough to actually contain | |
1539 | * all of the allocated clusters (otherwise we get failing reads after | |
1540 | * EOF). Extend the image to the last allocated sector. | |
1541 | */ | |
060bee89 | 1542 | if (host_offset != 0) { |
7c2bbf4a HT |
1543 | uint8_t buf[BDRV_SECTOR_SIZE]; |
1544 | memset(buf, 0, BDRV_SECTOR_SIZE); | |
1545 | ret = bdrv_write(bs->file, (host_offset >> BDRV_SECTOR_BITS) + num - 1, | |
1546 | buf, 1); | |
19dbcbf7 KW |
1547 | if (ret < 0) { |
1548 | return ret; | |
1549 | } | |
a35e1c17 KW |
1550 | } |
1551 | ||
1552 | return 0; | |
1553 | } | |
1554 | ||
7c80ab3f JS |
1555 | static int qcow2_create2(const char *filename, int64_t total_size, |
1556 | const char *backing_file, const char *backing_format, | |
1557 | int flags, size_t cluster_size, int prealloc, | |
3ef6c40a HR |
1558 | QEMUOptionParameter *options, int version, |
1559 | Error **errp) | |
a9420734 | 1560 | { |
9b2260cb | 1561 | /* Calculate cluster_bits */ |
a9420734 KW |
1562 | int cluster_bits; |
1563 | cluster_bits = ffs(cluster_size) - 1; | |
1564 | if (cluster_bits < MIN_CLUSTER_BITS || cluster_bits > MAX_CLUSTER_BITS || | |
1565 | (1 << cluster_bits) != cluster_size) | |
1566 | { | |
3ef6c40a HR |
1567 | error_setg(errp, "Cluster size must be a power of two between %d and " |
1568 | "%dk", 1 << MIN_CLUSTER_BITS, 1 << (MAX_CLUSTER_BITS - 10)); | |
a9420734 KW |
1569 | return -EINVAL; |
1570 | } | |
1571 | ||
1572 | /* | |
1573 | * Open the image file and write a minimal qcow2 header. | |
1574 | * | |
1575 | * We keep things simple and start with a zero-sized image. We also | |
1576 | * do without refcount blocks or a L1 table for now. We'll fix the | |
1577 | * inconsistency later. | |
1578 | * | |
1579 | * We do need a refcount table because growing the refcount table means | |
1580 | * allocating two new refcount blocks - the seconds of which would be at | |
1581 | * 2 GB for 64k clusters, and we don't want to have a 2 GB initial file | |
1582 | * size for any qcow2 image. | |
1583 | */ | |
1584 | BlockDriverState* bs; | |
f8413b3c | 1585 | QCowHeader *header; |
a9420734 | 1586 | uint8_t* refcount_table; |
3ef6c40a | 1587 | Error *local_err = NULL; |
a9420734 KW |
1588 | int ret; |
1589 | ||
3ef6c40a | 1590 | ret = bdrv_create_file(filename, options, &local_err); |
a9420734 | 1591 | if (ret < 0) { |
3ef6c40a | 1592 | error_propagate(errp, local_err); |
a9420734 KW |
1593 | return ret; |
1594 | } | |
1595 | ||
2e40134b HR |
1596 | bs = NULL; |
1597 | ret = bdrv_open(&bs, filename, NULL, NULL, BDRV_O_RDWR | BDRV_O_PROTOCOL, | |
1598 | NULL, &local_err); | |
a9420734 | 1599 | if (ret < 0) { |
3ef6c40a | 1600 | error_propagate(errp, local_err); |
a9420734 KW |
1601 | return ret; |
1602 | } | |
1603 | ||
1604 | /* Write the header */ | |
f8413b3c KW |
1605 | QEMU_BUILD_BUG_ON((1 << MIN_CLUSTER_BITS) < sizeof(*header)); |
1606 | header = g_malloc0(cluster_size); | |
1607 | *header = (QCowHeader) { | |
1608 | .magic = cpu_to_be32(QCOW_MAGIC), | |
1609 | .version = cpu_to_be32(version), | |
1610 | .cluster_bits = cpu_to_be32(cluster_bits), | |
1611 | .size = cpu_to_be64(0), | |
1612 | .l1_table_offset = cpu_to_be64(0), | |
1613 | .l1_size = cpu_to_be32(0), | |
1614 | .refcount_table_offset = cpu_to_be64(cluster_size), | |
1615 | .refcount_table_clusters = cpu_to_be32(1), | |
1616 | .refcount_order = cpu_to_be32(3 + REFCOUNT_SHIFT), | |
1617 | .header_length = cpu_to_be32(sizeof(*header)), | |
1618 | }; | |
a9420734 KW |
1619 | |
1620 | if (flags & BLOCK_FLAG_ENCRYPT) { | |
f8413b3c | 1621 | header->crypt_method = cpu_to_be32(QCOW_CRYPT_AES); |
a9420734 | 1622 | } else { |
f8413b3c | 1623 | header->crypt_method = cpu_to_be32(QCOW_CRYPT_NONE); |
a9420734 KW |
1624 | } |
1625 | ||
bfe8043e | 1626 | if (flags & BLOCK_FLAG_LAZY_REFCOUNTS) { |
f8413b3c | 1627 | header->compatible_features |= |
bfe8043e SH |
1628 | cpu_to_be64(QCOW2_COMPAT_LAZY_REFCOUNTS); |
1629 | } | |
1630 | ||
f8413b3c KW |
1631 | ret = bdrv_pwrite(bs, 0, header, cluster_size); |
1632 | g_free(header); | |
a9420734 | 1633 | if (ret < 0) { |
3ef6c40a | 1634 | error_setg_errno(errp, -ret, "Could not write qcow2 header"); |
a9420734 KW |
1635 | goto out; |
1636 | } | |
1637 | ||
1638 | /* Write an empty refcount table */ | |
7267c094 | 1639 | refcount_table = g_malloc0(cluster_size); |
a9420734 | 1640 | ret = bdrv_pwrite(bs, cluster_size, refcount_table, cluster_size); |
7267c094 | 1641 | g_free(refcount_table); |
a9420734 KW |
1642 | |
1643 | if (ret < 0) { | |
3ef6c40a | 1644 | error_setg_errno(errp, -ret, "Could not write refcount table"); |
a9420734 KW |
1645 | goto out; |
1646 | } | |
1647 | ||
f67503e5 HR |
1648 | bdrv_unref(bs); |
1649 | bs = NULL; | |
a9420734 KW |
1650 | |
1651 | /* | |
1652 | * And now open the image and make it consistent first (i.e. increase the | |
1653 | * refcount of the cluster that is occupied by the header and the refcount | |
1654 | * table) | |
1655 | */ | |
1656 | BlockDriver* drv = bdrv_find_format("qcow2"); | |
1657 | assert(drv != NULL); | |
ddf5636d | 1658 | ret = bdrv_open(&bs, filename, NULL, NULL, |
3ef6c40a | 1659 | BDRV_O_RDWR | BDRV_O_CACHE_WB | BDRV_O_NO_FLUSH, drv, &local_err); |
a9420734 | 1660 | if (ret < 0) { |
3ef6c40a | 1661 | error_propagate(errp, local_err); |
a9420734 KW |
1662 | goto out; |
1663 | } | |
1664 | ||
1665 | ret = qcow2_alloc_clusters(bs, 2 * cluster_size); | |
1666 | if (ret < 0) { | |
3ef6c40a HR |
1667 | error_setg_errno(errp, -ret, "Could not allocate clusters for qcow2 " |
1668 | "header and refcount table"); | |
a9420734 KW |
1669 | goto out; |
1670 | ||
1671 | } else if (ret != 0) { | |
1672 | error_report("Huh, first cluster in empty image is already in use?"); | |
1673 | abort(); | |
1674 | } | |
1675 | ||
1676 | /* Okay, now that we have a valid image, let's give it the right size */ | |
1677 | ret = bdrv_truncate(bs, total_size * BDRV_SECTOR_SIZE); | |
1678 | if (ret < 0) { | |
3ef6c40a | 1679 | error_setg_errno(errp, -ret, "Could not resize image"); |
a9420734 KW |
1680 | goto out; |
1681 | } | |
1682 | ||
1683 | /* Want a backing file? There you go.*/ | |
1684 | if (backing_file) { | |
1685 | ret = bdrv_change_backing_file(bs, backing_file, backing_format); | |
1686 | if (ret < 0) { | |
3ef6c40a HR |
1687 | error_setg_errno(errp, -ret, "Could not assign backing file '%s' " |
1688 | "with format '%s'", backing_file, backing_format); | |
a9420734 KW |
1689 | goto out; |
1690 | } | |
1691 | } | |
1692 | ||
1693 | /* And if we're supposed to preallocate metadata, do that now */ | |
1694 | if (prealloc) { | |
15552c4a ZYW |
1695 | BDRVQcowState *s = bs->opaque; |
1696 | qemu_co_mutex_lock(&s->lock); | |
a9420734 | 1697 | ret = preallocate(bs); |
15552c4a | 1698 | qemu_co_mutex_unlock(&s->lock); |
a9420734 | 1699 | if (ret < 0) { |
3ef6c40a | 1700 | error_setg_errno(errp, -ret, "Could not preallocate metadata"); |
a9420734 KW |
1701 | goto out; |
1702 | } | |
1703 | } | |
1704 | ||
f67503e5 HR |
1705 | bdrv_unref(bs); |
1706 | bs = NULL; | |
ba2ab2f2 HR |
1707 | |
1708 | /* Reopen the image without BDRV_O_NO_FLUSH to flush it before returning */ | |
ddf5636d | 1709 | ret = bdrv_open(&bs, filename, NULL, NULL, |
c9fbb99d KW |
1710 | BDRV_O_RDWR | BDRV_O_CACHE_WB | BDRV_O_NO_BACKING, |
1711 | drv, &local_err); | |
84d18f06 | 1712 | if (local_err) { |
ba2ab2f2 HR |
1713 | error_propagate(errp, local_err); |
1714 | goto out; | |
1715 | } | |
1716 | ||
a9420734 KW |
1717 | ret = 0; |
1718 | out: | |
f67503e5 HR |
1719 | if (bs) { |
1720 | bdrv_unref(bs); | |
1721 | } | |
a9420734 KW |
1722 | return ret; |
1723 | } | |
de5f3f40 | 1724 | |
d5124c00 HR |
1725 | static int qcow2_create(const char *filename, QEMUOptionParameter *options, |
1726 | Error **errp) | |
de5f3f40 KW |
1727 | { |
1728 | const char *backing_file = NULL; | |
1729 | const char *backing_fmt = NULL; | |
1730 | uint64_t sectors = 0; | |
1731 | int flags = 0; | |
99cce9fa | 1732 | size_t cluster_size = DEFAULT_CLUSTER_SIZE; |
de5f3f40 | 1733 | int prealloc = 0; |
8ad1898c | 1734 | int version = 3; |
3ef6c40a HR |
1735 | Error *local_err = NULL; |
1736 | int ret; | |
de5f3f40 KW |
1737 | |
1738 | /* Read out options */ | |
1739 | while (options && options->name) { | |
1740 | if (!strcmp(options->name, BLOCK_OPT_SIZE)) { | |
1741 | sectors = options->value.n / 512; | |
1742 | } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) { | |
1743 | backing_file = options->value.s; | |
1744 | } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FMT)) { | |
1745 | backing_fmt = options->value.s; | |
1746 | } else if (!strcmp(options->name, BLOCK_OPT_ENCRYPT)) { | |
1747 | flags |= options->value.n ? BLOCK_FLAG_ENCRYPT : 0; | |
1748 | } else if (!strcmp(options->name, BLOCK_OPT_CLUSTER_SIZE)) { | |
1749 | if (options->value.n) { | |
1750 | cluster_size = options->value.n; | |
1751 | } | |
1752 | } else if (!strcmp(options->name, BLOCK_OPT_PREALLOC)) { | |
1753 | if (!options->value.s || !strcmp(options->value.s, "off")) { | |
1754 | prealloc = 0; | |
1755 | } else if (!strcmp(options->value.s, "metadata")) { | |
1756 | prealloc = 1; | |
1757 | } else { | |
3ef6c40a HR |
1758 | error_setg(errp, "Invalid preallocation mode: '%s'", |
1759 | options->value.s); | |
de5f3f40 KW |
1760 | return -EINVAL; |
1761 | } | |
6744cbab | 1762 | } else if (!strcmp(options->name, BLOCK_OPT_COMPAT_LEVEL)) { |
9117b477 KW |
1763 | if (!options->value.s) { |
1764 | /* keep the default */ | |
1765 | } else if (!strcmp(options->value.s, "0.10")) { | |
6744cbab KW |
1766 | version = 2; |
1767 | } else if (!strcmp(options->value.s, "1.1")) { | |
1768 | version = 3; | |
1769 | } else { | |
3ef6c40a HR |
1770 | error_setg(errp, "Invalid compatibility level: '%s'", |
1771 | options->value.s); | |
6744cbab KW |
1772 | return -EINVAL; |
1773 | } | |
bfe8043e SH |
1774 | } else if (!strcmp(options->name, BLOCK_OPT_LAZY_REFCOUNTS)) { |
1775 | flags |= options->value.n ? BLOCK_FLAG_LAZY_REFCOUNTS : 0; | |
de5f3f40 KW |
1776 | } |
1777 | options++; | |
1778 | } | |
1779 | ||
1780 | if (backing_file && prealloc) { | |
3ef6c40a HR |
1781 | error_setg(errp, "Backing file and preallocation cannot be used at " |
1782 | "the same time"); | |
de5f3f40 KW |
1783 | return -EINVAL; |
1784 | } | |
1785 | ||
bfe8043e | 1786 | if (version < 3 && (flags & BLOCK_FLAG_LAZY_REFCOUNTS)) { |
3ef6c40a HR |
1787 | error_setg(errp, "Lazy refcounts only supported with compatibility " |
1788 | "level 1.1 and above (use compat=1.1 or greater)"); | |
bfe8043e SH |
1789 | return -EINVAL; |
1790 | } | |
1791 | ||
3ef6c40a HR |
1792 | ret = qcow2_create2(filename, sectors, backing_file, backing_fmt, flags, |
1793 | cluster_size, prealloc, options, version, &local_err); | |
84d18f06 | 1794 | if (local_err) { |
3ef6c40a HR |
1795 | error_propagate(errp, local_err); |
1796 | } | |
1797 | return ret; | |
de5f3f40 KW |
1798 | } |
1799 | ||
621f0589 | 1800 | static coroutine_fn int qcow2_co_write_zeroes(BlockDriverState *bs, |
aa7bfbff | 1801 | int64_t sector_num, int nb_sectors, BdrvRequestFlags flags) |
621f0589 KW |
1802 | { |
1803 | int ret; | |
1804 | BDRVQcowState *s = bs->opaque; | |
1805 | ||
1806 | /* Emulate misaligned zero writes */ | |
1807 | if (sector_num % s->cluster_sectors || nb_sectors % s->cluster_sectors) { | |
1808 | return -ENOTSUP; | |
1809 | } | |
1810 | ||
1811 | /* Whatever is left can use real zero clusters */ | |
1812 | qemu_co_mutex_lock(&s->lock); | |
1813 | ret = qcow2_zero_clusters(bs, sector_num << BDRV_SECTOR_BITS, | |
1814 | nb_sectors); | |
1815 | qemu_co_mutex_unlock(&s->lock); | |
1816 | ||
1817 | return ret; | |
1818 | } | |
1819 | ||
6db39ae2 PB |
1820 | static coroutine_fn int qcow2_co_discard(BlockDriverState *bs, |
1821 | int64_t sector_num, int nb_sectors) | |
5ea929e3 | 1822 | { |
6db39ae2 PB |
1823 | int ret; |
1824 | BDRVQcowState *s = bs->opaque; | |
1825 | ||
1826 | qemu_co_mutex_lock(&s->lock); | |
1827 | ret = qcow2_discard_clusters(bs, sector_num << BDRV_SECTOR_BITS, | |
670df5e3 | 1828 | nb_sectors, QCOW2_DISCARD_REQUEST); |
6db39ae2 PB |
1829 | qemu_co_mutex_unlock(&s->lock); |
1830 | return ret; | |
5ea929e3 KW |
1831 | } |
1832 | ||
419b19d9 SH |
1833 | static int qcow2_truncate(BlockDriverState *bs, int64_t offset) |
1834 | { | |
1835 | BDRVQcowState *s = bs->opaque; | |
2cf7cfa1 KW |
1836 | int64_t new_l1_size; |
1837 | int ret; | |
419b19d9 SH |
1838 | |
1839 | if (offset & 511) { | |
259b2173 | 1840 | error_report("The new size must be a multiple of 512"); |
419b19d9 SH |
1841 | return -EINVAL; |
1842 | } | |
1843 | ||
1844 | /* cannot proceed if image has snapshots */ | |
1845 | if (s->nb_snapshots) { | |
259b2173 | 1846 | error_report("Can't resize an image which has snapshots"); |
419b19d9 SH |
1847 | return -ENOTSUP; |
1848 | } | |
1849 | ||
1850 | /* shrinking is currently not supported */ | |
1851 | if (offset < bs->total_sectors * 512) { | |
259b2173 | 1852 | error_report("qcow2 doesn't support shrinking images yet"); |
419b19d9 SH |
1853 | return -ENOTSUP; |
1854 | } | |
1855 | ||
1856 | new_l1_size = size_to_l1(s, offset); | |
72893756 | 1857 | ret = qcow2_grow_l1_table(bs, new_l1_size, true); |
419b19d9 SH |
1858 | if (ret < 0) { |
1859 | return ret; | |
1860 | } | |
1861 | ||
1862 | /* write updated header.size */ | |
1863 | offset = cpu_to_be64(offset); | |
8b3b7206 KW |
1864 | ret = bdrv_pwrite_sync(bs->file, offsetof(QCowHeader, size), |
1865 | &offset, sizeof(uint64_t)); | |
419b19d9 SH |
1866 | if (ret < 0) { |
1867 | return ret; | |
1868 | } | |
1869 | ||
1870 | s->l1_vm_state_index = new_l1_size; | |
1871 | return 0; | |
1872 | } | |
1873 | ||
20d97356 BS |
1874 | /* XXX: put compressed sectors first, then all the cluster aligned |
1875 | tables to avoid losing bytes in alignment */ | |
7c80ab3f JS |
1876 | static int qcow2_write_compressed(BlockDriverState *bs, int64_t sector_num, |
1877 | const uint8_t *buf, int nb_sectors) | |
20d97356 BS |
1878 | { |
1879 | BDRVQcowState *s = bs->opaque; | |
1880 | z_stream strm; | |
1881 | int ret, out_len; | |
1882 | uint8_t *out_buf; | |
1883 | uint64_t cluster_offset; | |
1884 | ||
1885 | if (nb_sectors == 0) { | |
1886 | /* align end of file to a sector boundary to ease reading with | |
1887 | sector based I/Os */ | |
66f82cee | 1888 | cluster_offset = bdrv_getlength(bs->file); |
20d97356 | 1889 | cluster_offset = (cluster_offset + 511) & ~511; |
66f82cee | 1890 | bdrv_truncate(bs->file, cluster_offset); |
20d97356 BS |
1891 | return 0; |
1892 | } | |
1893 | ||
f4d38bef SH |
1894 | if (nb_sectors != s->cluster_sectors) { |
1895 | ret = -EINVAL; | |
1896 | ||
1897 | /* Zero-pad last write if image size is not cluster aligned */ | |
1898 | if (sector_num + nb_sectors == bs->total_sectors && | |
1899 | nb_sectors < s->cluster_sectors) { | |
1900 | uint8_t *pad_buf = qemu_blockalign(bs, s->cluster_size); | |
1901 | memset(pad_buf, 0, s->cluster_size); | |
1902 | memcpy(pad_buf, buf, nb_sectors * BDRV_SECTOR_SIZE); | |
1903 | ret = qcow2_write_compressed(bs, sector_num, | |
1904 | pad_buf, s->cluster_sectors); | |
1905 | qemu_vfree(pad_buf); | |
1906 | } | |
1907 | return ret; | |
1908 | } | |
20d97356 | 1909 | |
7267c094 | 1910 | out_buf = g_malloc(s->cluster_size + (s->cluster_size / 1000) + 128); |
20d97356 BS |
1911 | |
1912 | /* best compression, small window, no zlib header */ | |
1913 | memset(&strm, 0, sizeof(strm)); | |
1914 | ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION, | |
1915 | Z_DEFLATED, -12, | |
1916 | 9, Z_DEFAULT_STRATEGY); | |
1917 | if (ret != 0) { | |
8f1efd00 KW |
1918 | ret = -EINVAL; |
1919 | goto fail; | |
20d97356 BS |
1920 | } |
1921 | ||
1922 | strm.avail_in = s->cluster_size; | |
1923 | strm.next_in = (uint8_t *)buf; | |
1924 | strm.avail_out = s->cluster_size; | |
1925 | strm.next_out = out_buf; | |
1926 | ||
1927 | ret = deflate(&strm, Z_FINISH); | |
1928 | if (ret != Z_STREAM_END && ret != Z_OK) { | |
20d97356 | 1929 | deflateEnd(&strm); |
8f1efd00 KW |
1930 | ret = -EINVAL; |
1931 | goto fail; | |
20d97356 BS |
1932 | } |
1933 | out_len = strm.next_out - out_buf; | |
1934 | ||
1935 | deflateEnd(&strm); | |
1936 | ||
1937 | if (ret != Z_STREAM_END || out_len >= s->cluster_size) { | |
1938 | /* could not compress: write normal cluster */ | |
8f1efd00 KW |
1939 | ret = bdrv_write(bs, sector_num, buf, s->cluster_sectors); |
1940 | if (ret < 0) { | |
1941 | goto fail; | |
1942 | } | |
20d97356 BS |
1943 | } else { |
1944 | cluster_offset = qcow2_alloc_compressed_cluster_offset(bs, | |
1945 | sector_num << 9, out_len); | |
8f1efd00 KW |
1946 | if (!cluster_offset) { |
1947 | ret = -EIO; | |
1948 | goto fail; | |
1949 | } | |
20d97356 | 1950 | cluster_offset &= s->cluster_offset_mask; |
cf93980e | 1951 | |
231bb267 | 1952 | ret = qcow2_pre_write_overlap_check(bs, 0, cluster_offset, out_len); |
cf93980e HR |
1953 | if (ret < 0) { |
1954 | goto fail; | |
1955 | } | |
1956 | ||
66f82cee | 1957 | BLKDBG_EVENT(bs->file, BLKDBG_WRITE_COMPRESSED); |
8f1efd00 KW |
1958 | ret = bdrv_pwrite(bs->file, cluster_offset, out_buf, out_len); |
1959 | if (ret < 0) { | |
1960 | goto fail; | |
20d97356 BS |
1961 | } |
1962 | } | |
1963 | ||
8f1efd00 KW |
1964 | ret = 0; |
1965 | fail: | |
7267c094 | 1966 | g_free(out_buf); |
8f1efd00 | 1967 | return ret; |
20d97356 BS |
1968 | } |
1969 | ||
a968168c | 1970 | static coroutine_fn int qcow2_co_flush_to_os(BlockDriverState *bs) |
20d97356 | 1971 | { |
29c1a730 KW |
1972 | BDRVQcowState *s = bs->opaque; |
1973 | int ret; | |
1974 | ||
8b94ff85 | 1975 | qemu_co_mutex_lock(&s->lock); |
29c1a730 KW |
1976 | ret = qcow2_cache_flush(bs, s->l2_table_cache); |
1977 | if (ret < 0) { | |
c95de7e2 | 1978 | qemu_co_mutex_unlock(&s->lock); |
8b94ff85 | 1979 | return ret; |
29c1a730 KW |
1980 | } |
1981 | ||
bfe8043e SH |
1982 | if (qcow2_need_accurate_refcounts(s)) { |
1983 | ret = qcow2_cache_flush(bs, s->refcount_block_cache); | |
1984 | if (ret < 0) { | |
1985 | qemu_co_mutex_unlock(&s->lock); | |
1986 | return ret; | |
1987 | } | |
29c1a730 | 1988 | } |
8b94ff85 | 1989 | qemu_co_mutex_unlock(&s->lock); |
29c1a730 | 1990 | |
eb489bb1 KW |
1991 | return 0; |
1992 | } | |
1993 | ||
7c80ab3f | 1994 | static int qcow2_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
20d97356 BS |
1995 | { |
1996 | BDRVQcowState *s = bs->opaque; | |
95de6d70 PB |
1997 | bdi->unallocated_blocks_are_zero = true; |
1998 | bdi->can_write_zeroes_with_unmap = (s->qcow_version >= 3); | |
20d97356 | 1999 | bdi->cluster_size = s->cluster_size; |
7c80ab3f | 2000 | bdi->vm_state_offset = qcow2_vm_state_offset(s); |
20d97356 BS |
2001 | return 0; |
2002 | } | |
2003 | ||
37764dfb HR |
2004 | static ImageInfoSpecific *qcow2_get_specific_info(BlockDriverState *bs) |
2005 | { | |
2006 | BDRVQcowState *s = bs->opaque; | |
2007 | ImageInfoSpecific *spec_info = g_new(ImageInfoSpecific, 1); | |
2008 | ||
2009 | *spec_info = (ImageInfoSpecific){ | |
2010 | .kind = IMAGE_INFO_SPECIFIC_KIND_QCOW2, | |
2011 | { | |
2012 | .qcow2 = g_new(ImageInfoSpecificQCow2, 1), | |
2013 | }, | |
2014 | }; | |
2015 | if (s->qcow_version == 2) { | |
2016 | *spec_info->qcow2 = (ImageInfoSpecificQCow2){ | |
2017 | .compat = g_strdup("0.10"), | |
2018 | }; | |
2019 | } else if (s->qcow_version == 3) { | |
2020 | *spec_info->qcow2 = (ImageInfoSpecificQCow2){ | |
2021 | .compat = g_strdup("1.1"), | |
2022 | .lazy_refcounts = s->compatible_features & | |
2023 | QCOW2_COMPAT_LAZY_REFCOUNTS, | |
2024 | .has_lazy_refcounts = true, | |
2025 | }; | |
2026 | } | |
2027 | ||
2028 | return spec_info; | |
2029 | } | |
2030 | ||
20d97356 BS |
2031 | #if 0 |
2032 | static void dump_refcounts(BlockDriverState *bs) | |
2033 | { | |
2034 | BDRVQcowState *s = bs->opaque; | |
2035 | int64_t nb_clusters, k, k1, size; | |
2036 | int refcount; | |
2037 | ||
66f82cee | 2038 | size = bdrv_getlength(bs->file); |
20d97356 BS |
2039 | nb_clusters = size_to_clusters(s, size); |
2040 | for(k = 0; k < nb_clusters;) { | |
2041 | k1 = k; | |
2042 | refcount = get_refcount(bs, k); | |
2043 | k++; | |
2044 | while (k < nb_clusters && get_refcount(bs, k) == refcount) | |
2045 | k++; | |
0bfcd599 BS |
2046 | printf("%" PRId64 ": refcount=%d nb=%" PRId64 "\n", k, refcount, |
2047 | k - k1); | |
20d97356 BS |
2048 | } |
2049 | } | |
2050 | #endif | |
2051 | ||
cf8074b3 KW |
2052 | static int qcow2_save_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, |
2053 | int64_t pos) | |
20d97356 BS |
2054 | { |
2055 | BDRVQcowState *s = bs->opaque; | |
eedff66f | 2056 | int64_t total_sectors = bs->total_sectors; |
20d97356 | 2057 | int growable = bs->growable; |
6e13610a | 2058 | bool zero_beyond_eof = bs->zero_beyond_eof; |
20d97356 BS |
2059 | int ret; |
2060 | ||
66f82cee | 2061 | BLKDBG_EVENT(bs->file, BLKDBG_VMSTATE_SAVE); |
20d97356 | 2062 | bs->growable = 1; |
6e13610a | 2063 | bs->zero_beyond_eof = false; |
8d3b1a2d | 2064 | ret = bdrv_pwritev(bs, qcow2_vm_state_offset(s) + pos, qiov); |
20d97356 | 2065 | bs->growable = growable; |
6e13610a | 2066 | bs->zero_beyond_eof = zero_beyond_eof; |
20d97356 | 2067 | |
eedff66f HR |
2068 | /* bdrv_co_do_writev will have increased the total_sectors value to include |
2069 | * the VM state - the VM state is however not an actual part of the block | |
2070 | * device, therefore, we need to restore the old value. */ | |
2071 | bs->total_sectors = total_sectors; | |
2072 | ||
20d97356 BS |
2073 | return ret; |
2074 | } | |
2075 | ||
7c80ab3f JS |
2076 | static int qcow2_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
2077 | int64_t pos, int size) | |
20d97356 BS |
2078 | { |
2079 | BDRVQcowState *s = bs->opaque; | |
2080 | int growable = bs->growable; | |
0d51b4de | 2081 | bool zero_beyond_eof = bs->zero_beyond_eof; |
20d97356 BS |
2082 | int ret; |
2083 | ||
66f82cee | 2084 | BLKDBG_EVENT(bs->file, BLKDBG_VMSTATE_LOAD); |
20d97356 | 2085 | bs->growable = 1; |
0d51b4de | 2086 | bs->zero_beyond_eof = false; |
7c80ab3f | 2087 | ret = bdrv_pread(bs, qcow2_vm_state_offset(s) + pos, buf, size); |
20d97356 | 2088 | bs->growable = growable; |
0d51b4de | 2089 | bs->zero_beyond_eof = zero_beyond_eof; |
20d97356 BS |
2090 | |
2091 | return ret; | |
2092 | } | |
2093 | ||
9296b3ed HR |
2094 | /* |
2095 | * Downgrades an image's version. To achieve this, any incompatible features | |
2096 | * have to be removed. | |
2097 | */ | |
2098 | static int qcow2_downgrade(BlockDriverState *bs, int target_version) | |
2099 | { | |
2100 | BDRVQcowState *s = bs->opaque; | |
2101 | int current_version = s->qcow_version; | |
2102 | int ret; | |
2103 | ||
2104 | if (target_version == current_version) { | |
2105 | return 0; | |
2106 | } else if (target_version > current_version) { | |
2107 | return -EINVAL; | |
2108 | } else if (target_version != 2) { | |
2109 | return -EINVAL; | |
2110 | } | |
2111 | ||
2112 | if (s->refcount_order != 4) { | |
2113 | /* we would have to convert the image to a refcount_order == 4 image | |
2114 | * here; however, since qemu (at the time of writing this) does not | |
2115 | * support anything different than 4 anyway, there is no point in doing | |
2116 | * so right now; however, we should error out (if qemu supports this in | |
2117 | * the future and this code has not been adapted) */ | |
9e3f0892 | 2118 | error_report("qcow2_downgrade: Image refcount orders other than 4 are " |
9296b3ed HR |
2119 | "currently not supported."); |
2120 | return -ENOTSUP; | |
2121 | } | |
2122 | ||
2123 | /* clear incompatible features */ | |
2124 | if (s->incompatible_features & QCOW2_INCOMPAT_DIRTY) { | |
2125 | ret = qcow2_mark_clean(bs); | |
2126 | if (ret < 0) { | |
2127 | return ret; | |
2128 | } | |
2129 | } | |
2130 | ||
2131 | /* with QCOW2_INCOMPAT_CORRUPT, it is pretty much impossible to get here in | |
2132 | * the first place; if that happens nonetheless, returning -ENOTSUP is the | |
2133 | * best thing to do anyway */ | |
2134 | ||
2135 | if (s->incompatible_features) { | |
2136 | return -ENOTSUP; | |
2137 | } | |
2138 | ||
2139 | /* since we can ignore compatible features, we can set them to 0 as well */ | |
2140 | s->compatible_features = 0; | |
2141 | /* if lazy refcounts have been used, they have already been fixed through | |
2142 | * clearing the dirty flag */ | |
2143 | ||
2144 | /* clearing autoclear features is trivial */ | |
2145 | s->autoclear_features = 0; | |
2146 | ||
2147 | ret = qcow2_expand_zero_clusters(bs); | |
2148 | if (ret < 0) { | |
2149 | return ret; | |
2150 | } | |
2151 | ||
2152 | s->qcow_version = target_version; | |
2153 | ret = qcow2_update_header(bs); | |
2154 | if (ret < 0) { | |
2155 | s->qcow_version = current_version; | |
2156 | return ret; | |
2157 | } | |
2158 | return 0; | |
2159 | } | |
2160 | ||
2161 | static int qcow2_amend_options(BlockDriverState *bs, | |
2162 | QEMUOptionParameter *options) | |
2163 | { | |
2164 | BDRVQcowState *s = bs->opaque; | |
2165 | int old_version = s->qcow_version, new_version = old_version; | |
2166 | uint64_t new_size = 0; | |
2167 | const char *backing_file = NULL, *backing_format = NULL; | |
2168 | bool lazy_refcounts = s->use_lazy_refcounts; | |
2169 | int ret; | |
2170 | int i; | |
2171 | ||
2172 | for (i = 0; options[i].name; i++) | |
2173 | { | |
2174 | if (!options[i].assigned) { | |
2175 | /* only change explicitly defined options */ | |
2176 | continue; | |
2177 | } | |
2178 | ||
2179 | if (!strcmp(options[i].name, "compat")) { | |
2180 | if (!options[i].value.s) { | |
2181 | /* preserve default */ | |
2182 | } else if (!strcmp(options[i].value.s, "0.10")) { | |
2183 | new_version = 2; | |
2184 | } else if (!strcmp(options[i].value.s, "1.1")) { | |
2185 | new_version = 3; | |
2186 | } else { | |
2187 | fprintf(stderr, "Unknown compatibility level %s.\n", | |
2188 | options[i].value.s); | |
2189 | return -EINVAL; | |
2190 | } | |
2191 | } else if (!strcmp(options[i].name, "preallocation")) { | |
2192 | fprintf(stderr, "Cannot change preallocation mode.\n"); | |
2193 | return -ENOTSUP; | |
2194 | } else if (!strcmp(options[i].name, "size")) { | |
2195 | new_size = options[i].value.n; | |
2196 | } else if (!strcmp(options[i].name, "backing_file")) { | |
2197 | backing_file = options[i].value.s; | |
2198 | } else if (!strcmp(options[i].name, "backing_fmt")) { | |
2199 | backing_format = options[i].value.s; | |
2200 | } else if (!strcmp(options[i].name, "encryption")) { | |
2201 | if ((options[i].value.n != !!s->crypt_method)) { | |
2202 | fprintf(stderr, "Changing the encryption flag is not " | |
2203 | "supported.\n"); | |
2204 | return -ENOTSUP; | |
2205 | } | |
2206 | } else if (!strcmp(options[i].name, "cluster_size")) { | |
2207 | if (options[i].value.n != s->cluster_size) { | |
2208 | fprintf(stderr, "Changing the cluster size is not " | |
2209 | "supported.\n"); | |
2210 | return -ENOTSUP; | |
2211 | } | |
2212 | } else if (!strcmp(options[i].name, "lazy_refcounts")) { | |
2213 | lazy_refcounts = options[i].value.n; | |
2214 | } else { | |
2215 | /* if this assertion fails, this probably means a new option was | |
2216 | * added without having it covered here */ | |
2217 | assert(false); | |
2218 | } | |
2219 | } | |
2220 | ||
2221 | if (new_version != old_version) { | |
2222 | if (new_version > old_version) { | |
2223 | /* Upgrade */ | |
2224 | s->qcow_version = new_version; | |
2225 | ret = qcow2_update_header(bs); | |
2226 | if (ret < 0) { | |
2227 | s->qcow_version = old_version; | |
2228 | return ret; | |
2229 | } | |
2230 | } else { | |
2231 | ret = qcow2_downgrade(bs, new_version); | |
2232 | if (ret < 0) { | |
2233 | return ret; | |
2234 | } | |
2235 | } | |
2236 | } | |
2237 | ||
2238 | if (backing_file || backing_format) { | |
2239 | ret = qcow2_change_backing_file(bs, backing_file ?: bs->backing_file, | |
2240 | backing_format ?: bs->backing_format); | |
2241 | if (ret < 0) { | |
2242 | return ret; | |
2243 | } | |
2244 | } | |
2245 | ||
2246 | if (s->use_lazy_refcounts != lazy_refcounts) { | |
2247 | if (lazy_refcounts) { | |
2248 | if (s->qcow_version < 3) { | |
2249 | fprintf(stderr, "Lazy refcounts only supported with compatibility " | |
2250 | "level 1.1 and above (use compat=1.1 or greater)\n"); | |
2251 | return -EINVAL; | |
2252 | } | |
2253 | s->compatible_features |= QCOW2_COMPAT_LAZY_REFCOUNTS; | |
2254 | ret = qcow2_update_header(bs); | |
2255 | if (ret < 0) { | |
2256 | s->compatible_features &= ~QCOW2_COMPAT_LAZY_REFCOUNTS; | |
2257 | return ret; | |
2258 | } | |
2259 | s->use_lazy_refcounts = true; | |
2260 | } else { | |
2261 | /* make image clean first */ | |
2262 | ret = qcow2_mark_clean(bs); | |
2263 | if (ret < 0) { | |
2264 | return ret; | |
2265 | } | |
2266 | /* now disallow lazy refcounts */ | |
2267 | s->compatible_features &= ~QCOW2_COMPAT_LAZY_REFCOUNTS; | |
2268 | ret = qcow2_update_header(bs); | |
2269 | if (ret < 0) { | |
2270 | s->compatible_features |= QCOW2_COMPAT_LAZY_REFCOUNTS; | |
2271 | return ret; | |
2272 | } | |
2273 | s->use_lazy_refcounts = false; | |
2274 | } | |
2275 | } | |
2276 | ||
2277 | if (new_size) { | |
2278 | ret = bdrv_truncate(bs, new_size); | |
2279 | if (ret < 0) { | |
2280 | return ret; | |
2281 | } | |
2282 | } | |
2283 | ||
2284 | return 0; | |
2285 | } | |
2286 | ||
7c80ab3f | 2287 | static QEMUOptionParameter qcow2_create_options[] = { |
20d97356 BS |
2288 | { |
2289 | .name = BLOCK_OPT_SIZE, | |
2290 | .type = OPT_SIZE, | |
2291 | .help = "Virtual disk size" | |
2292 | }, | |
6744cbab KW |
2293 | { |
2294 | .name = BLOCK_OPT_COMPAT_LEVEL, | |
2295 | .type = OPT_STRING, | |
2296 | .help = "Compatibility level (0.10 or 1.1)" | |
2297 | }, | |
20d97356 BS |
2298 | { |
2299 | .name = BLOCK_OPT_BACKING_FILE, | |
2300 | .type = OPT_STRING, | |
2301 | .help = "File name of a base image" | |
2302 | }, | |
2303 | { | |
2304 | .name = BLOCK_OPT_BACKING_FMT, | |
2305 | .type = OPT_STRING, | |
2306 | .help = "Image format of the base image" | |
2307 | }, | |
2308 | { | |
2309 | .name = BLOCK_OPT_ENCRYPT, | |
2310 | .type = OPT_FLAG, | |
2311 | .help = "Encrypt the image" | |
2312 | }, | |
2313 | { | |
2314 | .name = BLOCK_OPT_CLUSTER_SIZE, | |
2315 | .type = OPT_SIZE, | |
99cce9fa KW |
2316 | .help = "qcow2 cluster size", |
2317 | .value = { .n = DEFAULT_CLUSTER_SIZE }, | |
20d97356 BS |
2318 | }, |
2319 | { | |
2320 | .name = BLOCK_OPT_PREALLOC, | |
2321 | .type = OPT_STRING, | |
2322 | .help = "Preallocation mode (allowed values: off, metadata)" | |
2323 | }, | |
bfe8043e SH |
2324 | { |
2325 | .name = BLOCK_OPT_LAZY_REFCOUNTS, | |
2326 | .type = OPT_FLAG, | |
2327 | .help = "Postpone refcount updates", | |
2328 | }, | |
20d97356 BS |
2329 | { NULL } |
2330 | }; | |
2331 | ||
2332 | static BlockDriver bdrv_qcow2 = { | |
7c80ab3f JS |
2333 | .format_name = "qcow2", |
2334 | .instance_size = sizeof(BDRVQcowState), | |
2335 | .bdrv_probe = qcow2_probe, | |
2336 | .bdrv_open = qcow2_open, | |
2337 | .bdrv_close = qcow2_close, | |
21d82ac9 | 2338 | .bdrv_reopen_prepare = qcow2_reopen_prepare, |
7c80ab3f | 2339 | .bdrv_create = qcow2_create, |
3ac21627 | 2340 | .bdrv_has_zero_init = bdrv_has_zero_init_1, |
b6b8a333 | 2341 | .bdrv_co_get_block_status = qcow2_co_get_block_status, |
7c80ab3f | 2342 | .bdrv_set_key = qcow2_set_key, |
7c80ab3f | 2343 | |
c68b89ac KW |
2344 | .bdrv_co_readv = qcow2_co_readv, |
2345 | .bdrv_co_writev = qcow2_co_writev, | |
eb489bb1 | 2346 | .bdrv_co_flush_to_os = qcow2_co_flush_to_os, |
419b19d9 | 2347 | |
621f0589 | 2348 | .bdrv_co_write_zeroes = qcow2_co_write_zeroes, |
6db39ae2 | 2349 | .bdrv_co_discard = qcow2_co_discard, |
419b19d9 | 2350 | .bdrv_truncate = qcow2_truncate, |
7c80ab3f | 2351 | .bdrv_write_compressed = qcow2_write_compressed, |
20d97356 BS |
2352 | |
2353 | .bdrv_snapshot_create = qcow2_snapshot_create, | |
2354 | .bdrv_snapshot_goto = qcow2_snapshot_goto, | |
2355 | .bdrv_snapshot_delete = qcow2_snapshot_delete, | |
2356 | .bdrv_snapshot_list = qcow2_snapshot_list, | |
51ef6727 | 2357 | .bdrv_snapshot_load_tmp = qcow2_snapshot_load_tmp, |
7c80ab3f | 2358 | .bdrv_get_info = qcow2_get_info, |
37764dfb | 2359 | .bdrv_get_specific_info = qcow2_get_specific_info, |
20d97356 | 2360 | |
7c80ab3f JS |
2361 | .bdrv_save_vmstate = qcow2_save_vmstate, |
2362 | .bdrv_load_vmstate = qcow2_load_vmstate, | |
20d97356 BS |
2363 | |
2364 | .bdrv_change_backing_file = qcow2_change_backing_file, | |
2365 | ||
d34682cd | 2366 | .bdrv_refresh_limits = qcow2_refresh_limits, |
06d9260f AL |
2367 | .bdrv_invalidate_cache = qcow2_invalidate_cache, |
2368 | ||
7c80ab3f JS |
2369 | .create_options = qcow2_create_options, |
2370 | .bdrv_check = qcow2_check, | |
9296b3ed | 2371 | .bdrv_amend_options = qcow2_amend_options, |
20d97356 BS |
2372 | }; |
2373 | ||
5efa9d5a AL |
2374 | static void bdrv_qcow2_init(void) |
2375 | { | |
2376 | bdrv_register(&bdrv_qcow2); | |
2377 | } | |
2378 | ||
2379 | block_init(bdrv_qcow2_init); |