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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" |
ffeaac9b | 33 | #include "qapi/util.h" |
85186ebd HR |
34 | #include "qapi/qmp/types.h" |
35 | #include "qapi-event.h" | |
3cce16f4 | 36 | #include "trace.h" |
1bd0e2d1 | 37 | #include "qemu/option_int.h" |
585f8587 FB |
38 | |
39 | /* | |
40 | Differences with QCOW: | |
41 | ||
42 | - Support for multiple incremental snapshots. | |
43 | - Memory management by reference counts. | |
44 | - Clusters which have a reference count of one have the bit | |
45 | QCOW_OFLAG_COPIED to optimize write performance. | |
5fafdf24 | 46 | - Size of compressed clusters is stored in sectors to reduce bit usage |
585f8587 FB |
47 | in the cluster offsets. |
48 | - Support for storing additional data (such as the VM state) in the | |
3b46e624 | 49 | snapshots. |
585f8587 FB |
50 | - If a backing store is used, the cluster size is not constrained |
51 | (could be backported to QCOW). | |
52 | - L2 tables have always a size of one cluster. | |
53 | */ | |
54 | ||
9b80ddf3 AL |
55 | |
56 | typedef struct { | |
57 | uint32_t magic; | |
58 | uint32_t len; | |
c4217f64 | 59 | } QEMU_PACKED QCowExtension; |
21d82ac9 | 60 | |
7c80ab3f JS |
61 | #define QCOW2_EXT_MAGIC_END 0 |
62 | #define QCOW2_EXT_MAGIC_BACKING_FORMAT 0xE2792ACA | |
cfcc4c62 | 63 | #define QCOW2_EXT_MAGIC_FEATURE_TABLE 0x6803f857 |
9b80ddf3 | 64 | |
7c80ab3f | 65 | static int qcow2_probe(const uint8_t *buf, int buf_size, const char *filename) |
585f8587 FB |
66 | { |
67 | const QCowHeader *cow_header = (const void *)buf; | |
3b46e624 | 68 | |
585f8587 FB |
69 | if (buf_size >= sizeof(QCowHeader) && |
70 | be32_to_cpu(cow_header->magic) == QCOW_MAGIC && | |
6744cbab | 71 | be32_to_cpu(cow_header->version) >= 2) |
585f8587 FB |
72 | return 100; |
73 | else | |
74 | return 0; | |
75 | } | |
76 | ||
9b80ddf3 AL |
77 | |
78 | /* | |
79 | * read qcow2 extension and fill bs | |
80 | * start reading from start_offset | |
81 | * finish reading upon magic of value 0 or when end_offset reached | |
82 | * unknown magic is skipped (future extension this version knows nothing about) | |
83 | * return 0 upon success, non-0 otherwise | |
84 | */ | |
7c80ab3f | 85 | static int qcow2_read_extensions(BlockDriverState *bs, uint64_t start_offset, |
3ef6c40a HR |
86 | uint64_t end_offset, void **p_feature_table, |
87 | Error **errp) | |
9b80ddf3 | 88 | { |
75bab85c | 89 | BDRVQcowState *s = bs->opaque; |
9b80ddf3 AL |
90 | QCowExtension ext; |
91 | uint64_t offset; | |
75bab85c | 92 | int ret; |
9b80ddf3 AL |
93 | |
94 | #ifdef DEBUG_EXT | |
7c80ab3f | 95 | printf("qcow2_read_extensions: start=%ld end=%ld\n", start_offset, end_offset); |
9b80ddf3 AL |
96 | #endif |
97 | offset = start_offset; | |
98 | while (offset < end_offset) { | |
99 | ||
100 | #ifdef DEBUG_EXT | |
101 | /* Sanity check */ | |
102 | if (offset > s->cluster_size) | |
7c80ab3f | 103 | printf("qcow2_read_extension: suspicious offset %lu\n", offset); |
9b80ddf3 | 104 | |
9b2260cb | 105 | printf("attempting to read extended header in offset %lu\n", offset); |
9b80ddf3 AL |
106 | #endif |
107 | ||
3ef6c40a HR |
108 | ret = bdrv_pread(bs->file, offset, &ext, sizeof(ext)); |
109 | if (ret < 0) { | |
110 | error_setg_errno(errp, -ret, "qcow2_read_extension: ERROR: " | |
111 | "pread fail from offset %" PRIu64, offset); | |
9b80ddf3 AL |
112 | return 1; |
113 | } | |
114 | be32_to_cpus(&ext.magic); | |
115 | be32_to_cpus(&ext.len); | |
116 | offset += sizeof(ext); | |
117 | #ifdef DEBUG_EXT | |
118 | printf("ext.magic = 0x%x\n", ext.magic); | |
119 | #endif | |
2ebafc85 | 120 | if (offset > end_offset || ext.len > end_offset - offset) { |
3ef6c40a | 121 | error_setg(errp, "Header extension too large"); |
64ca6aee KW |
122 | return -EINVAL; |
123 | } | |
124 | ||
9b80ddf3 | 125 | switch (ext.magic) { |
7c80ab3f | 126 | case QCOW2_EXT_MAGIC_END: |
9b80ddf3 | 127 | return 0; |
f965509c | 128 | |
7c80ab3f | 129 | case QCOW2_EXT_MAGIC_BACKING_FORMAT: |
f965509c | 130 | if (ext.len >= sizeof(bs->backing_format)) { |
521b2b5d HR |
131 | error_setg(errp, "ERROR: ext_backing_format: len=%" PRIu32 |
132 | " too large (>=%zu)", ext.len, | |
133 | sizeof(bs->backing_format)); | |
f965509c AL |
134 | return 2; |
135 | } | |
3ef6c40a HR |
136 | ret = bdrv_pread(bs->file, offset, bs->backing_format, ext.len); |
137 | if (ret < 0) { | |
138 | error_setg_errno(errp, -ret, "ERROR: ext_backing_format: " | |
139 | "Could not read format name"); | |
f965509c | 140 | return 3; |
3ef6c40a | 141 | } |
f965509c AL |
142 | bs->backing_format[ext.len] = '\0'; |
143 | #ifdef DEBUG_EXT | |
144 | printf("Qcow2: Got format extension %s\n", bs->backing_format); | |
145 | #endif | |
f965509c AL |
146 | break; |
147 | ||
cfcc4c62 KW |
148 | case QCOW2_EXT_MAGIC_FEATURE_TABLE: |
149 | if (p_feature_table != NULL) { | |
150 | void* feature_table = g_malloc0(ext.len + 2 * sizeof(Qcow2Feature)); | |
151 | ret = bdrv_pread(bs->file, offset , feature_table, ext.len); | |
152 | if (ret < 0) { | |
3ef6c40a HR |
153 | error_setg_errno(errp, -ret, "ERROR: ext_feature_table: " |
154 | "Could not read table"); | |
cfcc4c62 KW |
155 | return ret; |
156 | } | |
157 | ||
158 | *p_feature_table = feature_table; | |
159 | } | |
160 | break; | |
161 | ||
9b80ddf3 | 162 | default: |
75bab85c KW |
163 | /* unknown magic - save it in case we need to rewrite the header */ |
164 | { | |
165 | Qcow2UnknownHeaderExtension *uext; | |
166 | ||
167 | uext = g_malloc0(sizeof(*uext) + ext.len); | |
168 | uext->magic = ext.magic; | |
169 | uext->len = ext.len; | |
170 | QLIST_INSERT_HEAD(&s->unknown_header_ext, uext, next); | |
171 | ||
172 | ret = bdrv_pread(bs->file, offset , uext->data, uext->len); | |
173 | if (ret < 0) { | |
3ef6c40a HR |
174 | error_setg_errno(errp, -ret, "ERROR: unknown extension: " |
175 | "Could not read data"); | |
75bab85c KW |
176 | return ret; |
177 | } | |
75bab85c | 178 | } |
9b80ddf3 AL |
179 | break; |
180 | } | |
fd29b4bb KW |
181 | |
182 | offset += ((ext.len + 7) & ~7); | |
9b80ddf3 AL |
183 | } |
184 | ||
185 | return 0; | |
186 | } | |
187 | ||
75bab85c KW |
188 | static void cleanup_unknown_header_ext(BlockDriverState *bs) |
189 | { | |
190 | BDRVQcowState *s = bs->opaque; | |
191 | Qcow2UnknownHeaderExtension *uext, *next; | |
192 | ||
193 | QLIST_FOREACH_SAFE(uext, &s->unknown_header_ext, next, next) { | |
194 | QLIST_REMOVE(uext, next); | |
195 | g_free(uext); | |
196 | } | |
197 | } | |
9b80ddf3 | 198 | |
3ef6c40a HR |
199 | static void GCC_FMT_ATTR(3, 4) report_unsupported(BlockDriverState *bs, |
200 | Error **errp, const char *fmt, ...) | |
6744cbab KW |
201 | { |
202 | char msg[64]; | |
203 | va_list ap; | |
204 | ||
205 | va_start(ap, fmt); | |
206 | vsnprintf(msg, sizeof(msg), fmt, ap); | |
207 | va_end(ap); | |
208 | ||
bfb197e0 MA |
209 | error_set(errp, QERR_UNKNOWN_BLOCK_FORMAT_FEATURE, |
210 | bdrv_get_device_name(bs), "qcow2", msg); | |
6744cbab KW |
211 | } |
212 | ||
cfcc4c62 | 213 | static void report_unsupported_feature(BlockDriverState *bs, |
3ef6c40a | 214 | Error **errp, Qcow2Feature *table, uint64_t mask) |
cfcc4c62 | 215 | { |
12ac6d3d KW |
216 | char *features = g_strdup(""); |
217 | char *old; | |
218 | ||
cfcc4c62 KW |
219 | while (table && table->name[0] != '\0') { |
220 | if (table->type == QCOW2_FEAT_TYPE_INCOMPATIBLE) { | |
12ac6d3d KW |
221 | if (mask & (1ULL << table->bit)) { |
222 | old = features; | |
223 | features = g_strdup_printf("%s%s%.46s", old, *old ? ", " : "", | |
224 | table->name); | |
225 | g_free(old); | |
226 | mask &= ~(1ULL << table->bit); | |
cfcc4c62 KW |
227 | } |
228 | } | |
229 | table++; | |
230 | } | |
231 | ||
232 | if (mask) { | |
12ac6d3d KW |
233 | old = features; |
234 | features = g_strdup_printf("%s%sUnknown incompatible feature: %" PRIx64, | |
235 | old, *old ? ", " : "", mask); | |
236 | g_free(old); | |
cfcc4c62 | 237 | } |
12ac6d3d KW |
238 | |
239 | report_unsupported(bs, errp, "%s", features); | |
240 | g_free(features); | |
cfcc4c62 KW |
241 | } |
242 | ||
bfe8043e SH |
243 | /* |
244 | * Sets the dirty bit and flushes afterwards if necessary. | |
245 | * | |
246 | * The incompatible_features bit is only set if the image file header was | |
247 | * updated successfully. Therefore it is not required to check the return | |
248 | * value of this function. | |
249 | */ | |
280d3735 | 250 | int qcow2_mark_dirty(BlockDriverState *bs) |
bfe8043e SH |
251 | { |
252 | BDRVQcowState *s = bs->opaque; | |
253 | uint64_t val; | |
254 | int ret; | |
255 | ||
256 | assert(s->qcow_version >= 3); | |
257 | ||
258 | if (s->incompatible_features & QCOW2_INCOMPAT_DIRTY) { | |
259 | return 0; /* already dirty */ | |
260 | } | |
261 | ||
262 | val = cpu_to_be64(s->incompatible_features | QCOW2_INCOMPAT_DIRTY); | |
263 | ret = bdrv_pwrite(bs->file, offsetof(QCowHeader, incompatible_features), | |
264 | &val, sizeof(val)); | |
265 | if (ret < 0) { | |
266 | return ret; | |
267 | } | |
268 | ret = bdrv_flush(bs->file); | |
269 | if (ret < 0) { | |
270 | return ret; | |
271 | } | |
272 | ||
273 | /* Only treat image as dirty if the header was updated successfully */ | |
274 | s->incompatible_features |= QCOW2_INCOMPAT_DIRTY; | |
275 | return 0; | |
276 | } | |
277 | ||
c61d0004 SH |
278 | /* |
279 | * Clears the dirty bit and flushes before if necessary. Only call this | |
280 | * function when there are no pending requests, it does not guard against | |
281 | * concurrent requests dirtying the image. | |
282 | */ | |
283 | static int qcow2_mark_clean(BlockDriverState *bs) | |
284 | { | |
285 | BDRVQcowState *s = bs->opaque; | |
286 | ||
287 | if (s->incompatible_features & QCOW2_INCOMPAT_DIRTY) { | |
4c2e5f8f KW |
288 | int ret; |
289 | ||
290 | s->incompatible_features &= ~QCOW2_INCOMPAT_DIRTY; | |
291 | ||
292 | ret = bdrv_flush(bs); | |
c61d0004 SH |
293 | if (ret < 0) { |
294 | return ret; | |
295 | } | |
296 | ||
c61d0004 SH |
297 | return qcow2_update_header(bs); |
298 | } | |
299 | return 0; | |
300 | } | |
301 | ||
69c98726 HR |
302 | /* |
303 | * Marks the image as corrupt. | |
304 | */ | |
305 | int qcow2_mark_corrupt(BlockDriverState *bs) | |
306 | { | |
307 | BDRVQcowState *s = bs->opaque; | |
308 | ||
309 | s->incompatible_features |= QCOW2_INCOMPAT_CORRUPT; | |
310 | return qcow2_update_header(bs); | |
311 | } | |
312 | ||
313 | /* | |
314 | * Marks the image as consistent, i.e., unsets the corrupt bit, and flushes | |
315 | * before if necessary. | |
316 | */ | |
317 | int qcow2_mark_consistent(BlockDriverState *bs) | |
318 | { | |
319 | BDRVQcowState *s = bs->opaque; | |
320 | ||
321 | if (s->incompatible_features & QCOW2_INCOMPAT_CORRUPT) { | |
322 | int ret = bdrv_flush(bs); | |
323 | if (ret < 0) { | |
324 | return ret; | |
325 | } | |
326 | ||
327 | s->incompatible_features &= ~QCOW2_INCOMPAT_CORRUPT; | |
328 | return qcow2_update_header(bs); | |
329 | } | |
330 | return 0; | |
331 | } | |
332 | ||
acbe5982 SH |
333 | static int qcow2_check(BlockDriverState *bs, BdrvCheckResult *result, |
334 | BdrvCheckMode fix) | |
335 | { | |
336 | int ret = qcow2_check_refcounts(bs, result, fix); | |
337 | if (ret < 0) { | |
338 | return ret; | |
339 | } | |
340 | ||
341 | if (fix && result->check_errors == 0 && result->corruptions == 0) { | |
24530f3e HR |
342 | ret = qcow2_mark_clean(bs); |
343 | if (ret < 0) { | |
344 | return ret; | |
345 | } | |
346 | return qcow2_mark_consistent(bs); | |
acbe5982 SH |
347 | } |
348 | return ret; | |
349 | } | |
350 | ||
8c7de283 KW |
351 | static int validate_table_offset(BlockDriverState *bs, uint64_t offset, |
352 | uint64_t entries, size_t entry_len) | |
353 | { | |
354 | BDRVQcowState *s = bs->opaque; | |
355 | uint64_t size; | |
356 | ||
357 | /* Use signed INT64_MAX as the maximum even for uint64_t header fields, | |
358 | * because values will be passed to qemu functions taking int64_t. */ | |
359 | if (entries > INT64_MAX / entry_len) { | |
360 | return -EINVAL; | |
361 | } | |
362 | ||
363 | size = entries * entry_len; | |
364 | ||
365 | if (INT64_MAX - size < offset) { | |
366 | return -EINVAL; | |
367 | } | |
368 | ||
369 | /* Tables must be cluster aligned */ | |
370 | if (offset & (s->cluster_size - 1)) { | |
371 | return -EINVAL; | |
372 | } | |
373 | ||
374 | return 0; | |
375 | } | |
376 | ||
74c4510a KW |
377 | static QemuOptsList qcow2_runtime_opts = { |
378 | .name = "qcow2", | |
379 | .head = QTAILQ_HEAD_INITIALIZER(qcow2_runtime_opts.head), | |
380 | .desc = { | |
381 | { | |
64aa99d3 | 382 | .name = QCOW2_OPT_LAZY_REFCOUNTS, |
74c4510a KW |
383 | .type = QEMU_OPT_BOOL, |
384 | .help = "Postpone refcount updates", | |
385 | }, | |
67af674e KW |
386 | { |
387 | .name = QCOW2_OPT_DISCARD_REQUEST, | |
388 | .type = QEMU_OPT_BOOL, | |
389 | .help = "Pass guest discard requests to the layer below", | |
390 | }, | |
391 | { | |
392 | .name = QCOW2_OPT_DISCARD_SNAPSHOT, | |
393 | .type = QEMU_OPT_BOOL, | |
394 | .help = "Generate discard requests when snapshot related space " | |
395 | "is freed", | |
396 | }, | |
397 | { | |
398 | .name = QCOW2_OPT_DISCARD_OTHER, | |
399 | .type = QEMU_OPT_BOOL, | |
400 | .help = "Generate discard requests when other clusters are freed", | |
401 | }, | |
05de7e86 HR |
402 | { |
403 | .name = QCOW2_OPT_OVERLAP, | |
404 | .type = QEMU_OPT_STRING, | |
405 | .help = "Selects which overlap checks to perform from a range of " | |
406 | "templates (none, constant, cached, all)", | |
407 | }, | |
ee42b5ce HR |
408 | { |
409 | .name = QCOW2_OPT_OVERLAP_TEMPLATE, | |
410 | .type = QEMU_OPT_STRING, | |
411 | .help = "Selects which overlap checks to perform from a range of " | |
412 | "templates (none, constant, cached, all)", | |
413 | }, | |
05de7e86 HR |
414 | { |
415 | .name = QCOW2_OPT_OVERLAP_MAIN_HEADER, | |
416 | .type = QEMU_OPT_BOOL, | |
417 | .help = "Check for unintended writes into the main qcow2 header", | |
418 | }, | |
419 | { | |
420 | .name = QCOW2_OPT_OVERLAP_ACTIVE_L1, | |
421 | .type = QEMU_OPT_BOOL, | |
422 | .help = "Check for unintended writes into the active L1 table", | |
423 | }, | |
424 | { | |
425 | .name = QCOW2_OPT_OVERLAP_ACTIVE_L2, | |
426 | .type = QEMU_OPT_BOOL, | |
427 | .help = "Check for unintended writes into an active L2 table", | |
428 | }, | |
429 | { | |
430 | .name = QCOW2_OPT_OVERLAP_REFCOUNT_TABLE, | |
431 | .type = QEMU_OPT_BOOL, | |
432 | .help = "Check for unintended writes into the refcount table", | |
433 | }, | |
434 | { | |
435 | .name = QCOW2_OPT_OVERLAP_REFCOUNT_BLOCK, | |
436 | .type = QEMU_OPT_BOOL, | |
437 | .help = "Check for unintended writes into a refcount block", | |
438 | }, | |
439 | { | |
440 | .name = QCOW2_OPT_OVERLAP_SNAPSHOT_TABLE, | |
441 | .type = QEMU_OPT_BOOL, | |
442 | .help = "Check for unintended writes into the snapshot table", | |
443 | }, | |
444 | { | |
445 | .name = QCOW2_OPT_OVERLAP_INACTIVE_L1, | |
446 | .type = QEMU_OPT_BOOL, | |
447 | .help = "Check for unintended writes into an inactive L1 table", | |
448 | }, | |
449 | { | |
450 | .name = QCOW2_OPT_OVERLAP_INACTIVE_L2, | |
451 | .type = QEMU_OPT_BOOL, | |
452 | .help = "Check for unintended writes into an inactive L2 table", | |
453 | }, | |
6c1c8d5d HR |
454 | { |
455 | .name = QCOW2_OPT_CACHE_SIZE, | |
456 | .type = QEMU_OPT_SIZE, | |
457 | .help = "Maximum combined metadata (L2 tables and refcount blocks) " | |
458 | "cache size", | |
459 | }, | |
460 | { | |
461 | .name = QCOW2_OPT_L2_CACHE_SIZE, | |
462 | .type = QEMU_OPT_SIZE, | |
463 | .help = "Maximum L2 table cache size", | |
464 | }, | |
465 | { | |
466 | .name = QCOW2_OPT_REFCOUNT_CACHE_SIZE, | |
467 | .type = QEMU_OPT_SIZE, | |
468 | .help = "Maximum refcount block cache size", | |
469 | }, | |
74c4510a KW |
470 | { /* end of list */ } |
471 | }, | |
472 | }; | |
473 | ||
4092e99d HR |
474 | static const char *overlap_bool_option_names[QCOW2_OL_MAX_BITNR] = { |
475 | [QCOW2_OL_MAIN_HEADER_BITNR] = QCOW2_OPT_OVERLAP_MAIN_HEADER, | |
476 | [QCOW2_OL_ACTIVE_L1_BITNR] = QCOW2_OPT_OVERLAP_ACTIVE_L1, | |
477 | [QCOW2_OL_ACTIVE_L2_BITNR] = QCOW2_OPT_OVERLAP_ACTIVE_L2, | |
478 | [QCOW2_OL_REFCOUNT_TABLE_BITNR] = QCOW2_OPT_OVERLAP_REFCOUNT_TABLE, | |
479 | [QCOW2_OL_REFCOUNT_BLOCK_BITNR] = QCOW2_OPT_OVERLAP_REFCOUNT_BLOCK, | |
480 | [QCOW2_OL_SNAPSHOT_TABLE_BITNR] = QCOW2_OPT_OVERLAP_SNAPSHOT_TABLE, | |
481 | [QCOW2_OL_INACTIVE_L1_BITNR] = QCOW2_OPT_OVERLAP_INACTIVE_L1, | |
482 | [QCOW2_OL_INACTIVE_L2_BITNR] = QCOW2_OPT_OVERLAP_INACTIVE_L2, | |
483 | }; | |
484 | ||
6c1c8d5d HR |
485 | static void read_cache_sizes(QemuOpts *opts, uint64_t *l2_cache_size, |
486 | uint64_t *refcount_cache_size, Error **errp) | |
487 | { | |
488 | uint64_t combined_cache_size; | |
489 | bool l2_cache_size_set, refcount_cache_size_set, combined_cache_size_set; | |
490 | ||
491 | combined_cache_size_set = qemu_opt_get(opts, QCOW2_OPT_CACHE_SIZE); | |
492 | l2_cache_size_set = qemu_opt_get(opts, QCOW2_OPT_L2_CACHE_SIZE); | |
493 | refcount_cache_size_set = qemu_opt_get(opts, QCOW2_OPT_REFCOUNT_CACHE_SIZE); | |
494 | ||
495 | combined_cache_size = qemu_opt_get_size(opts, QCOW2_OPT_CACHE_SIZE, 0); | |
496 | *l2_cache_size = qemu_opt_get_size(opts, QCOW2_OPT_L2_CACHE_SIZE, 0); | |
497 | *refcount_cache_size = qemu_opt_get_size(opts, | |
498 | QCOW2_OPT_REFCOUNT_CACHE_SIZE, 0); | |
499 | ||
500 | if (combined_cache_size_set) { | |
501 | if (l2_cache_size_set && refcount_cache_size_set) { | |
502 | error_setg(errp, QCOW2_OPT_CACHE_SIZE ", " QCOW2_OPT_L2_CACHE_SIZE | |
503 | " and " QCOW2_OPT_REFCOUNT_CACHE_SIZE " may not be set " | |
504 | "the same time"); | |
505 | return; | |
506 | } else if (*l2_cache_size > combined_cache_size) { | |
507 | error_setg(errp, QCOW2_OPT_L2_CACHE_SIZE " may not exceed " | |
508 | QCOW2_OPT_CACHE_SIZE); | |
509 | return; | |
510 | } else if (*refcount_cache_size > combined_cache_size) { | |
511 | error_setg(errp, QCOW2_OPT_REFCOUNT_CACHE_SIZE " may not exceed " | |
512 | QCOW2_OPT_CACHE_SIZE); | |
513 | return; | |
514 | } | |
515 | ||
516 | if (l2_cache_size_set) { | |
517 | *refcount_cache_size = combined_cache_size - *l2_cache_size; | |
518 | } else if (refcount_cache_size_set) { | |
519 | *l2_cache_size = combined_cache_size - *refcount_cache_size; | |
520 | } else { | |
521 | *refcount_cache_size = combined_cache_size | |
522 | / (DEFAULT_L2_REFCOUNT_SIZE_RATIO + 1); | |
523 | *l2_cache_size = combined_cache_size - *refcount_cache_size; | |
524 | } | |
525 | } else { | |
526 | if (!l2_cache_size_set && !refcount_cache_size_set) { | |
527 | *l2_cache_size = DEFAULT_L2_CACHE_BYTE_SIZE; | |
528 | *refcount_cache_size = *l2_cache_size | |
529 | / DEFAULT_L2_REFCOUNT_SIZE_RATIO; | |
530 | } else if (!l2_cache_size_set) { | |
531 | *l2_cache_size = *refcount_cache_size | |
532 | * DEFAULT_L2_REFCOUNT_SIZE_RATIO; | |
533 | } else if (!refcount_cache_size_set) { | |
534 | *refcount_cache_size = *l2_cache_size | |
535 | / DEFAULT_L2_REFCOUNT_SIZE_RATIO; | |
536 | } | |
537 | } | |
538 | } | |
539 | ||
015a1036 HR |
540 | static int qcow2_open(BlockDriverState *bs, QDict *options, int flags, |
541 | Error **errp) | |
585f8587 FB |
542 | { |
543 | BDRVQcowState *s = bs->opaque; | |
6d33e8e7 KW |
544 | unsigned int len, i; |
545 | int ret = 0; | |
585f8587 | 546 | QCowHeader header; |
7b17ce60 | 547 | QemuOpts *opts = NULL; |
74c4510a | 548 | Error *local_err = NULL; |
9b80ddf3 | 549 | uint64_t ext_end; |
2cf7cfa1 | 550 | uint64_t l1_vm_state_index; |
ee42b5ce | 551 | const char *opt_overlap_check, *opt_overlap_check_template; |
1fa5cc83 | 552 | int overlap_check_template = 0; |
440ba08a | 553 | uint64_t l2_cache_size, refcount_cache_size; |
585f8587 | 554 | |
6d85a57e JS |
555 | ret = bdrv_pread(bs->file, 0, &header, sizeof(header)); |
556 | if (ret < 0) { | |
3ef6c40a | 557 | error_setg_errno(errp, -ret, "Could not read qcow2 header"); |
585f8587 | 558 | goto fail; |
6d85a57e | 559 | } |
585f8587 FB |
560 | be32_to_cpus(&header.magic); |
561 | be32_to_cpus(&header.version); | |
562 | be64_to_cpus(&header.backing_file_offset); | |
563 | be32_to_cpus(&header.backing_file_size); | |
564 | be64_to_cpus(&header.size); | |
565 | be32_to_cpus(&header.cluster_bits); | |
566 | be32_to_cpus(&header.crypt_method); | |
567 | be64_to_cpus(&header.l1_table_offset); | |
568 | be32_to_cpus(&header.l1_size); | |
569 | be64_to_cpus(&header.refcount_table_offset); | |
570 | be32_to_cpus(&header.refcount_table_clusters); | |
571 | be64_to_cpus(&header.snapshots_offset); | |
572 | be32_to_cpus(&header.nb_snapshots); | |
3b46e624 | 573 | |
e8cdcec1 | 574 | if (header.magic != QCOW_MAGIC) { |
3ef6c40a | 575 | error_setg(errp, "Image is not in qcow2 format"); |
76abe407 | 576 | ret = -EINVAL; |
585f8587 | 577 | goto fail; |
6d85a57e | 578 | } |
6744cbab | 579 | if (header.version < 2 || header.version > 3) { |
521b2b5d | 580 | report_unsupported(bs, errp, "QCOW version %" PRIu32, header.version); |
6744cbab KW |
581 | ret = -ENOTSUP; |
582 | goto fail; | |
583 | } | |
584 | ||
585 | s->qcow_version = header.version; | |
586 | ||
24342f2c KW |
587 | /* Initialise cluster size */ |
588 | if (header.cluster_bits < MIN_CLUSTER_BITS || | |
589 | header.cluster_bits > MAX_CLUSTER_BITS) { | |
521b2b5d HR |
590 | error_setg(errp, "Unsupported cluster size: 2^%" PRIu32, |
591 | header.cluster_bits); | |
24342f2c KW |
592 | ret = -EINVAL; |
593 | goto fail; | |
594 | } | |
595 | ||
596 | s->cluster_bits = header.cluster_bits; | |
597 | s->cluster_size = 1 << s->cluster_bits; | |
598 | s->cluster_sectors = 1 << (s->cluster_bits - 9); | |
599 | ||
6744cbab KW |
600 | /* Initialise version 3 header fields */ |
601 | if (header.version == 2) { | |
602 | header.incompatible_features = 0; | |
603 | header.compatible_features = 0; | |
604 | header.autoclear_features = 0; | |
605 | header.refcount_order = 4; | |
606 | header.header_length = 72; | |
607 | } else { | |
608 | be64_to_cpus(&header.incompatible_features); | |
609 | be64_to_cpus(&header.compatible_features); | |
610 | be64_to_cpus(&header.autoclear_features); | |
611 | be32_to_cpus(&header.refcount_order); | |
612 | be32_to_cpus(&header.header_length); | |
24342f2c KW |
613 | |
614 | if (header.header_length < 104) { | |
615 | error_setg(errp, "qcow2 header too short"); | |
616 | ret = -EINVAL; | |
617 | goto fail; | |
618 | } | |
619 | } | |
620 | ||
621 | if (header.header_length > s->cluster_size) { | |
622 | error_setg(errp, "qcow2 header exceeds cluster size"); | |
623 | ret = -EINVAL; | |
624 | goto fail; | |
6744cbab KW |
625 | } |
626 | ||
627 | if (header.header_length > sizeof(header)) { | |
628 | s->unknown_header_fields_size = header.header_length - sizeof(header); | |
629 | s->unknown_header_fields = g_malloc(s->unknown_header_fields_size); | |
630 | ret = bdrv_pread(bs->file, sizeof(header), s->unknown_header_fields, | |
631 | s->unknown_header_fields_size); | |
632 | if (ret < 0) { | |
3ef6c40a HR |
633 | error_setg_errno(errp, -ret, "Could not read unknown qcow2 header " |
634 | "fields"); | |
6744cbab KW |
635 | goto fail; |
636 | } | |
637 | } | |
638 | ||
a1b3955c KW |
639 | if (header.backing_file_offset > s->cluster_size) { |
640 | error_setg(errp, "Invalid backing file offset"); | |
641 | ret = -EINVAL; | |
642 | goto fail; | |
643 | } | |
644 | ||
cfcc4c62 KW |
645 | if (header.backing_file_offset) { |
646 | ext_end = header.backing_file_offset; | |
647 | } else { | |
648 | ext_end = 1 << header.cluster_bits; | |
649 | } | |
650 | ||
6744cbab KW |
651 | /* Handle feature bits */ |
652 | s->incompatible_features = header.incompatible_features; | |
653 | s->compatible_features = header.compatible_features; | |
654 | s->autoclear_features = header.autoclear_features; | |
655 | ||
c61d0004 | 656 | if (s->incompatible_features & ~QCOW2_INCOMPAT_MASK) { |
cfcc4c62 KW |
657 | void *feature_table = NULL; |
658 | qcow2_read_extensions(bs, header.header_length, ext_end, | |
3ef6c40a HR |
659 | &feature_table, NULL); |
660 | report_unsupported_feature(bs, errp, feature_table, | |
c61d0004 SH |
661 | s->incompatible_features & |
662 | ~QCOW2_INCOMPAT_MASK); | |
6744cbab | 663 | ret = -ENOTSUP; |
c5a33ee9 | 664 | g_free(feature_table); |
6744cbab KW |
665 | goto fail; |
666 | } | |
667 | ||
69c98726 HR |
668 | if (s->incompatible_features & QCOW2_INCOMPAT_CORRUPT) { |
669 | /* Corrupt images may not be written to unless they are being repaired | |
670 | */ | |
671 | if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_CHECK)) { | |
3ef6c40a HR |
672 | error_setg(errp, "qcow2: Image is corrupt; cannot be opened " |
673 | "read/write"); | |
69c98726 HR |
674 | ret = -EACCES; |
675 | goto fail; | |
676 | } | |
677 | } | |
678 | ||
6744cbab KW |
679 | /* Check support for various header values */ |
680 | if (header.refcount_order != 4) { | |
3ef6c40a | 681 | report_unsupported(bs, errp, "%d bit reference counts", |
6744cbab | 682 | 1 << header.refcount_order); |
e8cdcec1 KW |
683 | ret = -ENOTSUP; |
684 | goto fail; | |
685 | } | |
b6481f37 | 686 | s->refcount_order = header.refcount_order; |
346a53df HR |
687 | s->refcount_bits = 1 << s->refcount_order; |
688 | s->refcount_max = UINT64_C(1) << (s->refcount_bits - 1); | |
689 | s->refcount_max += s->refcount_max - 1; | |
6744cbab | 690 | |
6d85a57e | 691 | if (header.crypt_method > QCOW_CRYPT_AES) { |
521b2b5d | 692 | error_setg(errp, "Unsupported encryption method: %" PRIu32, |
3ef6c40a | 693 | header.crypt_method); |
6d85a57e | 694 | ret = -EINVAL; |
585f8587 | 695 | goto fail; |
6d85a57e | 696 | } |
585f8587 | 697 | s->crypt_method_header = header.crypt_method; |
6d85a57e | 698 | if (s->crypt_method_header) { |
585f8587 | 699 | bs->encrypted = 1; |
6d85a57e | 700 | } |
24342f2c | 701 | |
585f8587 FB |
702 | s->l2_bits = s->cluster_bits - 3; /* L2 is always one cluster */ |
703 | s->l2_size = 1 << s->l2_bits; | |
1d13d654 HR |
704 | /* 2^(s->refcount_order - 3) is the refcount width in bytes */ |
705 | s->refcount_block_bits = s->cluster_bits - (s->refcount_order - 3); | |
706 | s->refcount_block_size = 1 << s->refcount_block_bits; | |
585f8587 FB |
707 | bs->total_sectors = header.size / 512; |
708 | s->csize_shift = (62 - (s->cluster_bits - 8)); | |
709 | s->csize_mask = (1 << (s->cluster_bits - 8)) - 1; | |
710 | s->cluster_offset_mask = (1LL << s->csize_shift) - 1; | |
5dab2fad | 711 | |
585f8587 | 712 | s->refcount_table_offset = header.refcount_table_offset; |
5fafdf24 | 713 | s->refcount_table_size = |
585f8587 FB |
714 | header.refcount_table_clusters << (s->cluster_bits - 3); |
715 | ||
2b5d5953 | 716 | if (header.refcount_table_clusters > qcow2_max_refcount_clusters(s)) { |
5dab2fad KW |
717 | error_setg(errp, "Reference count table too large"); |
718 | ret = -EINVAL; | |
719 | goto fail; | |
720 | } | |
721 | ||
8c7de283 KW |
722 | ret = validate_table_offset(bs, s->refcount_table_offset, |
723 | s->refcount_table_size, sizeof(uint64_t)); | |
724 | if (ret < 0) { | |
725 | error_setg(errp, "Invalid reference count table offset"); | |
726 | goto fail; | |
727 | } | |
728 | ||
ce48f2f4 KW |
729 | /* Snapshot table offset/length */ |
730 | if (header.nb_snapshots > QCOW_MAX_SNAPSHOTS) { | |
731 | error_setg(errp, "Too many snapshots"); | |
732 | ret = -EINVAL; | |
733 | goto fail; | |
734 | } | |
735 | ||
736 | ret = validate_table_offset(bs, header.snapshots_offset, | |
737 | header.nb_snapshots, | |
738 | sizeof(QCowSnapshotHeader)); | |
739 | if (ret < 0) { | |
740 | error_setg(errp, "Invalid snapshot table offset"); | |
741 | goto fail; | |
742 | } | |
743 | ||
585f8587 | 744 | /* read the level 1 table */ |
6a83f8b5 | 745 | if (header.l1_size > QCOW_MAX_L1_SIZE) { |
2d51c32c KW |
746 | error_setg(errp, "Active L1 table too large"); |
747 | ret = -EFBIG; | |
748 | goto fail; | |
749 | } | |
585f8587 | 750 | s->l1_size = header.l1_size; |
2cf7cfa1 KW |
751 | |
752 | l1_vm_state_index = size_to_l1(s, header.size); | |
753 | if (l1_vm_state_index > INT_MAX) { | |
3ef6c40a | 754 | error_setg(errp, "Image is too big"); |
2cf7cfa1 KW |
755 | ret = -EFBIG; |
756 | goto fail; | |
757 | } | |
758 | s->l1_vm_state_index = l1_vm_state_index; | |
759 | ||
585f8587 FB |
760 | /* the L1 table must contain at least enough entries to put |
761 | header.size bytes */ | |
6d85a57e | 762 | if (s->l1_size < s->l1_vm_state_index) { |
3ef6c40a | 763 | error_setg(errp, "L1 table is too small"); |
6d85a57e | 764 | ret = -EINVAL; |
585f8587 | 765 | goto fail; |
6d85a57e | 766 | } |
2d51c32c KW |
767 | |
768 | ret = validate_table_offset(bs, header.l1_table_offset, | |
769 | header.l1_size, sizeof(uint64_t)); | |
770 | if (ret < 0) { | |
771 | error_setg(errp, "Invalid L1 table offset"); | |
772 | goto fail; | |
773 | } | |
585f8587 | 774 | s->l1_table_offset = header.l1_table_offset; |
2d51c32c KW |
775 | |
776 | ||
d191d12d | 777 | if (s->l1_size > 0) { |
de82815d | 778 | s->l1_table = qemu_try_blockalign(bs->file, |
d191d12d | 779 | align_offset(s->l1_size * sizeof(uint64_t), 512)); |
de82815d KW |
780 | if (s->l1_table == NULL) { |
781 | error_setg(errp, "Could not allocate L1 table"); | |
782 | ret = -ENOMEM; | |
783 | goto fail; | |
784 | } | |
6d85a57e JS |
785 | ret = bdrv_pread(bs->file, s->l1_table_offset, s->l1_table, |
786 | s->l1_size * sizeof(uint64_t)); | |
787 | if (ret < 0) { | |
3ef6c40a | 788 | error_setg_errno(errp, -ret, "Could not read L1 table"); |
d191d12d | 789 | goto fail; |
6d85a57e | 790 | } |
d191d12d SW |
791 | for(i = 0;i < s->l1_size; i++) { |
792 | be64_to_cpus(&s->l1_table[i]); | |
793 | } | |
585f8587 | 794 | } |
29c1a730 | 795 | |
6c1c8d5d HR |
796 | /* get L2 table/refcount block cache size from command line options */ |
797 | opts = qemu_opts_create(&qcow2_runtime_opts, NULL, 0, &error_abort); | |
798 | qemu_opts_absorb_qdict(opts, options, &local_err); | |
799 | if (local_err) { | |
800 | error_propagate(errp, local_err); | |
801 | ret = -EINVAL; | |
802 | goto fail; | |
803 | } | |
804 | ||
805 | read_cache_sizes(opts, &l2_cache_size, &refcount_cache_size, &local_err); | |
806 | if (local_err) { | |
807 | error_propagate(errp, local_err); | |
808 | ret = -EINVAL; | |
809 | goto fail; | |
810 | } | |
811 | ||
812 | l2_cache_size /= s->cluster_size; | |
440ba08a HR |
813 | if (l2_cache_size < MIN_L2_CACHE_SIZE) { |
814 | l2_cache_size = MIN_L2_CACHE_SIZE; | |
815 | } | |
6c1c8d5d HR |
816 | if (l2_cache_size > INT_MAX) { |
817 | error_setg(errp, "L2 cache size too big"); | |
818 | ret = -EINVAL; | |
819 | goto fail; | |
820 | } | |
440ba08a | 821 | |
6c1c8d5d | 822 | refcount_cache_size /= s->cluster_size; |
440ba08a HR |
823 | if (refcount_cache_size < MIN_REFCOUNT_CACHE_SIZE) { |
824 | refcount_cache_size = MIN_REFCOUNT_CACHE_SIZE; | |
825 | } | |
6c1c8d5d HR |
826 | if (refcount_cache_size > INT_MAX) { |
827 | error_setg(errp, "Refcount cache size too big"); | |
828 | ret = -EINVAL; | |
829 | goto fail; | |
830 | } | |
440ba08a | 831 | |
6c1c8d5d | 832 | /* alloc L2 table/refcount block cache */ |
440ba08a HR |
833 | s->l2_table_cache = qcow2_cache_create(bs, l2_cache_size); |
834 | s->refcount_block_cache = qcow2_cache_create(bs, refcount_cache_size); | |
de82815d KW |
835 | if (s->l2_table_cache == NULL || s->refcount_block_cache == NULL) { |
836 | error_setg(errp, "Could not allocate metadata caches"); | |
837 | ret = -ENOMEM; | |
838 | goto fail; | |
839 | } | |
29c1a730 | 840 | |
7267c094 | 841 | s->cluster_cache = g_malloc(s->cluster_size); |
585f8587 | 842 | /* one more sector for decompressed data alignment */ |
de82815d KW |
843 | s->cluster_data = qemu_try_blockalign(bs->file, QCOW_MAX_CRYPT_CLUSTERS |
844 | * s->cluster_size + 512); | |
845 | if (s->cluster_data == NULL) { | |
846 | error_setg(errp, "Could not allocate temporary cluster buffer"); | |
847 | ret = -ENOMEM; | |
848 | goto fail; | |
849 | } | |
850 | ||
585f8587 | 851 | s->cluster_cache_offset = -1; |
06d9260f | 852 | s->flags = flags; |
3b46e624 | 853 | |
6d85a57e JS |
854 | ret = qcow2_refcount_init(bs); |
855 | if (ret != 0) { | |
3ef6c40a | 856 | error_setg_errno(errp, -ret, "Could not initialize refcount handling"); |
585f8587 | 857 | goto fail; |
6d85a57e | 858 | } |
585f8587 | 859 | |
72cf2d4f | 860 | QLIST_INIT(&s->cluster_allocs); |
0b919fae | 861 | QTAILQ_INIT(&s->discards); |
f214978a | 862 | |
9b80ddf3 | 863 | /* read qcow2 extensions */ |
3ef6c40a HR |
864 | if (qcow2_read_extensions(bs, header.header_length, ext_end, NULL, |
865 | &local_err)) { | |
866 | error_propagate(errp, local_err); | |
6d85a57e | 867 | ret = -EINVAL; |
9b80ddf3 | 868 | goto fail; |
6d85a57e | 869 | } |
9b80ddf3 | 870 | |
585f8587 FB |
871 | /* read the backing file name */ |
872 | if (header.backing_file_offset != 0) { | |
873 | len = header.backing_file_size; | |
9a29e18f | 874 | if (len > MIN(1023, s->cluster_size - header.backing_file_offset) || |
e729fa6a | 875 | len >= sizeof(bs->backing_file)) { |
6d33e8e7 KW |
876 | error_setg(errp, "Backing file name too long"); |
877 | ret = -EINVAL; | |
878 | goto fail; | |
6d85a57e JS |
879 | } |
880 | ret = bdrv_pread(bs->file, header.backing_file_offset, | |
881 | bs->backing_file, len); | |
882 | if (ret < 0) { | |
3ef6c40a | 883 | error_setg_errno(errp, -ret, "Could not read backing file name"); |
585f8587 | 884 | goto fail; |
6d85a57e | 885 | } |
585f8587 FB |
886 | bs->backing_file[len] = '\0'; |
887 | } | |
42deb29f | 888 | |
11b128f4 KW |
889 | /* Internal snapshots */ |
890 | s->snapshots_offset = header.snapshots_offset; | |
891 | s->nb_snapshots = header.nb_snapshots; | |
892 | ||
42deb29f KW |
893 | ret = qcow2_read_snapshots(bs); |
894 | if (ret < 0) { | |
3ef6c40a | 895 | error_setg_errno(errp, -ret, "Could not read snapshots"); |
585f8587 | 896 | goto fail; |
6d85a57e | 897 | } |
585f8587 | 898 | |
af7b708d | 899 | /* Clear unknown autoclear feature bits */ |
27eb6c09 | 900 | if (!bs->read_only && !(flags & BDRV_O_INCOMING) && s->autoclear_features) { |
af7b708d SH |
901 | s->autoclear_features = 0; |
902 | ret = qcow2_update_header(bs); | |
903 | if (ret < 0) { | |
3ef6c40a | 904 | error_setg_errno(errp, -ret, "Could not update qcow2 header"); |
af7b708d SH |
905 | goto fail; |
906 | } | |
907 | } | |
908 | ||
68d100e9 KW |
909 | /* Initialise locks */ |
910 | qemu_co_mutex_init(&s->lock); | |
911 | ||
c61d0004 | 912 | /* Repair image if dirty */ |
27eb6c09 | 913 | if (!(flags & (BDRV_O_CHECK | BDRV_O_INCOMING)) && !bs->read_only && |
058f8f16 | 914 | (s->incompatible_features & QCOW2_INCOMPAT_DIRTY)) { |
c61d0004 SH |
915 | BdrvCheckResult result = {0}; |
916 | ||
5b84106b | 917 | ret = qcow2_check(bs, &result, BDRV_FIX_ERRORS | BDRV_FIX_LEAKS); |
c61d0004 | 918 | if (ret < 0) { |
3ef6c40a | 919 | error_setg_errno(errp, -ret, "Could not repair dirty image"); |
c61d0004 SH |
920 | goto fail; |
921 | } | |
922 | } | |
923 | ||
74c4510a | 924 | /* Enable lazy_refcounts according to image and command line options */ |
acdfb480 | 925 | s->use_lazy_refcounts = qemu_opt_get_bool(opts, QCOW2_OPT_LAZY_REFCOUNTS, |
74c4510a KW |
926 | (s->compatible_features & QCOW2_COMPAT_LAZY_REFCOUNTS)); |
927 | ||
67af674e KW |
928 | s->discard_passthrough[QCOW2_DISCARD_NEVER] = false; |
929 | s->discard_passthrough[QCOW2_DISCARD_ALWAYS] = true; | |
930 | s->discard_passthrough[QCOW2_DISCARD_REQUEST] = | |
931 | qemu_opt_get_bool(opts, QCOW2_OPT_DISCARD_REQUEST, | |
932 | flags & BDRV_O_UNMAP); | |
933 | s->discard_passthrough[QCOW2_DISCARD_SNAPSHOT] = | |
934 | qemu_opt_get_bool(opts, QCOW2_OPT_DISCARD_SNAPSHOT, true); | |
935 | s->discard_passthrough[QCOW2_DISCARD_OTHER] = | |
936 | qemu_opt_get_bool(opts, QCOW2_OPT_DISCARD_OTHER, false); | |
937 | ||
ee42b5ce HR |
938 | opt_overlap_check = qemu_opt_get(opts, QCOW2_OPT_OVERLAP); |
939 | opt_overlap_check_template = qemu_opt_get(opts, QCOW2_OPT_OVERLAP_TEMPLATE); | |
940 | if (opt_overlap_check_template && opt_overlap_check && | |
941 | strcmp(opt_overlap_check_template, opt_overlap_check)) | |
942 | { | |
943 | error_setg(errp, "Conflicting values for qcow2 options '" | |
944 | QCOW2_OPT_OVERLAP "' ('%s') and '" QCOW2_OPT_OVERLAP_TEMPLATE | |
945 | "' ('%s')", opt_overlap_check, opt_overlap_check_template); | |
946 | ret = -EINVAL; | |
947 | goto fail; | |
948 | } | |
949 | if (!opt_overlap_check) { | |
950 | opt_overlap_check = opt_overlap_check_template ?: "cached"; | |
951 | } | |
952 | ||
1fa5cc83 HR |
953 | if (!strcmp(opt_overlap_check, "none")) { |
954 | overlap_check_template = 0; | |
955 | } else if (!strcmp(opt_overlap_check, "constant")) { | |
956 | overlap_check_template = QCOW2_OL_CONSTANT; | |
957 | } else if (!strcmp(opt_overlap_check, "cached")) { | |
958 | overlap_check_template = QCOW2_OL_CACHED; | |
959 | } else if (!strcmp(opt_overlap_check, "all")) { | |
960 | overlap_check_template = QCOW2_OL_ALL; | |
961 | } else { | |
962 | error_setg(errp, "Unsupported value '%s' for qcow2 option " | |
963 | "'overlap-check'. Allowed are either of the following: " | |
964 | "none, constant, cached, all", opt_overlap_check); | |
1fa5cc83 HR |
965 | ret = -EINVAL; |
966 | goto fail; | |
967 | } | |
968 | ||
969 | s->overlap_check = 0; | |
970 | for (i = 0; i < QCOW2_OL_MAX_BITNR; i++) { | |
971 | /* overlap-check defines a template bitmask, but every flag may be | |
972 | * overwritten through the associated boolean option */ | |
973 | s->overlap_check |= | |
974 | qemu_opt_get_bool(opts, overlap_bool_option_names[i], | |
975 | overlap_check_template & (1 << i)) << i; | |
976 | } | |
3e355390 | 977 | |
74c4510a | 978 | qemu_opts_del(opts); |
7b17ce60 | 979 | opts = NULL; |
74c4510a KW |
980 | |
981 | if (s->use_lazy_refcounts && s->qcow_version < 3) { | |
3ef6c40a HR |
982 | error_setg(errp, "Lazy refcounts require a qcow2 image with at least " |
983 | "qemu 1.1 compatibility level"); | |
74c4510a KW |
984 | ret = -EINVAL; |
985 | goto fail; | |
986 | } | |
987 | ||
585f8587 | 988 | #ifdef DEBUG_ALLOC |
6cbc3031 PH |
989 | { |
990 | BdrvCheckResult result = {0}; | |
b35278f7 | 991 | qcow2_check_refcounts(bs, &result, 0); |
6cbc3031 | 992 | } |
585f8587 | 993 | #endif |
6d85a57e | 994 | return ret; |
585f8587 FB |
995 | |
996 | fail: | |
7b17ce60 | 997 | qemu_opts_del(opts); |
6744cbab | 998 | g_free(s->unknown_header_fields); |
75bab85c | 999 | cleanup_unknown_header_ext(bs); |
ed6ccf0f KW |
1000 | qcow2_free_snapshots(bs); |
1001 | qcow2_refcount_close(bs); | |
de82815d | 1002 | qemu_vfree(s->l1_table); |
cf93980e HR |
1003 | /* else pre-write overlap checks in cache_destroy may crash */ |
1004 | s->l1_table = NULL; | |
29c1a730 KW |
1005 | if (s->l2_table_cache) { |
1006 | qcow2_cache_destroy(bs, s->l2_table_cache); | |
1007 | } | |
c5a33ee9 PJ |
1008 | if (s->refcount_block_cache) { |
1009 | qcow2_cache_destroy(bs, s->refcount_block_cache); | |
1010 | } | |
7267c094 | 1011 | g_free(s->cluster_cache); |
dea43a65 | 1012 | qemu_vfree(s->cluster_data); |
6d85a57e | 1013 | return ret; |
585f8587 FB |
1014 | } |
1015 | ||
3baca891 | 1016 | static void qcow2_refresh_limits(BlockDriverState *bs, Error **errp) |
d34682cd KW |
1017 | { |
1018 | BDRVQcowState *s = bs->opaque; | |
1019 | ||
1020 | bs->bl.write_zeroes_alignment = s->cluster_sectors; | |
d34682cd KW |
1021 | } |
1022 | ||
7c80ab3f | 1023 | static int qcow2_set_key(BlockDriverState *bs, const char *key) |
585f8587 FB |
1024 | { |
1025 | BDRVQcowState *s = bs->opaque; | |
1026 | uint8_t keybuf[16]; | |
1027 | int len, i; | |
3b46e624 | 1028 | |
585f8587 FB |
1029 | memset(keybuf, 0, 16); |
1030 | len = strlen(key); | |
1031 | if (len > 16) | |
1032 | len = 16; | |
1033 | /* XXX: we could compress the chars to 7 bits to increase | |
1034 | entropy */ | |
1035 | for(i = 0;i < len;i++) { | |
1036 | keybuf[i] = key[i]; | |
1037 | } | |
1038 | s->crypt_method = s->crypt_method_header; | |
1039 | ||
1040 | if (AES_set_encrypt_key(keybuf, 128, &s->aes_encrypt_key) != 0) | |
1041 | return -1; | |
1042 | if (AES_set_decrypt_key(keybuf, 128, &s->aes_decrypt_key) != 0) | |
1043 | return -1; | |
1044 | #if 0 | |
1045 | /* test */ | |
1046 | { | |
1047 | uint8_t in[16]; | |
1048 | uint8_t out[16]; | |
1049 | uint8_t tmp[16]; | |
1050 | for(i=0;i<16;i++) | |
1051 | in[i] = i; | |
1052 | AES_encrypt(in, tmp, &s->aes_encrypt_key); | |
1053 | AES_decrypt(tmp, out, &s->aes_decrypt_key); | |
1054 | for(i = 0; i < 16; i++) | |
1055 | printf(" %02x", tmp[i]); | |
1056 | printf("\n"); | |
1057 | for(i = 0; i < 16; i++) | |
1058 | printf(" %02x", out[i]); | |
1059 | printf("\n"); | |
1060 | } | |
1061 | #endif | |
1062 | return 0; | |
1063 | } | |
1064 | ||
4c2e5f8f KW |
1065 | /* We have no actual commit/abort logic for qcow2, but we need to write out any |
1066 | * unwritten data if we reopen read-only. */ | |
21d82ac9 JC |
1067 | static int qcow2_reopen_prepare(BDRVReopenState *state, |
1068 | BlockReopenQueue *queue, Error **errp) | |
1069 | { | |
4c2e5f8f KW |
1070 | int ret; |
1071 | ||
1072 | if ((state->flags & BDRV_O_RDWR) == 0) { | |
1073 | ret = bdrv_flush(state->bs); | |
1074 | if (ret < 0) { | |
1075 | return ret; | |
1076 | } | |
1077 | ||
1078 | ret = qcow2_mark_clean(state->bs); | |
1079 | if (ret < 0) { | |
1080 | return ret; | |
1081 | } | |
1082 | } | |
1083 | ||
21d82ac9 JC |
1084 | return 0; |
1085 | } | |
1086 | ||
b6b8a333 | 1087 | static int64_t coroutine_fn qcow2_co_get_block_status(BlockDriverState *bs, |
f8a2e5e3 | 1088 | int64_t sector_num, int nb_sectors, int *pnum) |
585f8587 | 1089 | { |
f8a2e5e3 | 1090 | BDRVQcowState *s = bs->opaque; |
585f8587 | 1091 | uint64_t cluster_offset; |
4bc74be9 PB |
1092 | int index_in_cluster, ret; |
1093 | int64_t status = 0; | |
585f8587 | 1094 | |
095a9c58 | 1095 | *pnum = nb_sectors; |
f8a2e5e3 | 1096 | qemu_co_mutex_lock(&s->lock); |
1c46efaa | 1097 | ret = qcow2_get_cluster_offset(bs, sector_num << 9, pnum, &cluster_offset); |
f8a2e5e3 | 1098 | qemu_co_mutex_unlock(&s->lock); |
1c46efaa | 1099 | if (ret < 0) { |
d663640c | 1100 | return ret; |
1c46efaa | 1101 | } |
095a9c58 | 1102 | |
4bc74be9 PB |
1103 | if (cluster_offset != 0 && ret != QCOW2_CLUSTER_COMPRESSED && |
1104 | !s->crypt_method) { | |
1105 | index_in_cluster = sector_num & (s->cluster_sectors - 1); | |
1106 | cluster_offset |= (index_in_cluster << BDRV_SECTOR_BITS); | |
1107 | status |= BDRV_BLOCK_OFFSET_VALID | cluster_offset; | |
1108 | } | |
1109 | if (ret == QCOW2_CLUSTER_ZERO) { | |
1110 | status |= BDRV_BLOCK_ZERO; | |
1111 | } else if (ret != QCOW2_CLUSTER_UNALLOCATED) { | |
1112 | status |= BDRV_BLOCK_DATA; | |
1113 | } | |
1114 | return status; | |
585f8587 FB |
1115 | } |
1116 | ||
a9465922 | 1117 | /* handle reading after the end of the backing file */ |
bd28f835 KW |
1118 | int qcow2_backing_read1(BlockDriverState *bs, QEMUIOVector *qiov, |
1119 | int64_t sector_num, int nb_sectors) | |
a9465922 FB |
1120 | { |
1121 | int n1; | |
1122 | if ((sector_num + nb_sectors) <= bs->total_sectors) | |
1123 | return nb_sectors; | |
1124 | if (sector_num >= bs->total_sectors) | |
1125 | n1 = 0; | |
1126 | else | |
1127 | n1 = bs->total_sectors - sector_num; | |
bd28f835 | 1128 | |
3d9b4925 | 1129 | qemu_iovec_memset(qiov, 512 * n1, 0, 512 * (nb_sectors - n1)); |
bd28f835 | 1130 | |
a9465922 FB |
1131 | return n1; |
1132 | } | |
1133 | ||
a968168c | 1134 | static coroutine_fn int qcow2_co_readv(BlockDriverState *bs, int64_t sector_num, |
3fc48d09 | 1135 | int remaining_sectors, QEMUIOVector *qiov) |
585f8587 | 1136 | { |
585f8587 | 1137 | BDRVQcowState *s = bs->opaque; |
a9465922 | 1138 | int index_in_cluster, n1; |
68d100e9 | 1139 | int ret; |
faf575c1 | 1140 | int cur_nr_sectors; /* number of sectors in current iteration */ |
c2bdd990 | 1141 | uint64_t cluster_offset = 0; |
3fc48d09 FZ |
1142 | uint64_t bytes_done = 0; |
1143 | QEMUIOVector hd_qiov; | |
1144 | uint8_t *cluster_data = NULL; | |
585f8587 | 1145 | |
3fc48d09 FZ |
1146 | qemu_iovec_init(&hd_qiov, qiov->niov); |
1147 | ||
1148 | qemu_co_mutex_lock(&s->lock); | |
1149 | ||
1150 | while (remaining_sectors != 0) { | |
bd28f835 | 1151 | |
5ebaa27e | 1152 | /* prepare next request */ |
3fc48d09 | 1153 | cur_nr_sectors = remaining_sectors; |
5ebaa27e FZ |
1154 | if (s->crypt_method) { |
1155 | cur_nr_sectors = MIN(cur_nr_sectors, | |
1156 | QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors); | |
585f8587 | 1157 | } |
5ebaa27e | 1158 | |
3fc48d09 | 1159 | ret = qcow2_get_cluster_offset(bs, sector_num << 9, |
5ebaa27e | 1160 | &cur_nr_sectors, &cluster_offset); |
8af36488 | 1161 | if (ret < 0) { |
3fc48d09 | 1162 | goto fail; |
8af36488 | 1163 | } |
bd28f835 | 1164 | |
3fc48d09 | 1165 | index_in_cluster = sector_num & (s->cluster_sectors - 1); |
c87c0672 | 1166 | |
3fc48d09 | 1167 | qemu_iovec_reset(&hd_qiov); |
1b093c48 | 1168 | qemu_iovec_concat(&hd_qiov, qiov, bytes_done, |
5ebaa27e FZ |
1169 | cur_nr_sectors * 512); |
1170 | ||
68d000a3 KW |
1171 | switch (ret) { |
1172 | case QCOW2_CLUSTER_UNALLOCATED: | |
5ebaa27e FZ |
1173 | |
1174 | if (bs->backing_hd) { | |
1175 | /* read from the base image */ | |
3fc48d09 FZ |
1176 | n1 = qcow2_backing_read1(bs->backing_hd, &hd_qiov, |
1177 | sector_num, cur_nr_sectors); | |
5ebaa27e | 1178 | if (n1 > 0) { |
44deba5a KW |
1179 | QEMUIOVector local_qiov; |
1180 | ||
1181 | qemu_iovec_init(&local_qiov, hd_qiov.niov); | |
1182 | qemu_iovec_concat(&local_qiov, &hd_qiov, 0, | |
1183 | n1 * BDRV_SECTOR_SIZE); | |
1184 | ||
5ebaa27e FZ |
1185 | BLKDBG_EVENT(bs->file, BLKDBG_READ_BACKING_AIO); |
1186 | qemu_co_mutex_unlock(&s->lock); | |
3fc48d09 | 1187 | ret = bdrv_co_readv(bs->backing_hd, sector_num, |
44deba5a | 1188 | n1, &local_qiov); |
5ebaa27e | 1189 | qemu_co_mutex_lock(&s->lock); |
44deba5a KW |
1190 | |
1191 | qemu_iovec_destroy(&local_qiov); | |
1192 | ||
5ebaa27e | 1193 | if (ret < 0) { |
3fc48d09 | 1194 | goto fail; |
5ebaa27e FZ |
1195 | } |
1196 | } | |
1197 | } else { | |
1198 | /* Note: in this case, no need to wait */ | |
3d9b4925 | 1199 | qemu_iovec_memset(&hd_qiov, 0, 0, 512 * cur_nr_sectors); |
5ebaa27e | 1200 | } |
68d000a3 KW |
1201 | break; |
1202 | ||
6377af48 | 1203 | case QCOW2_CLUSTER_ZERO: |
3d9b4925 | 1204 | qemu_iovec_memset(&hd_qiov, 0, 0, 512 * cur_nr_sectors); |
6377af48 KW |
1205 | break; |
1206 | ||
68d000a3 | 1207 | case QCOW2_CLUSTER_COMPRESSED: |
5ebaa27e FZ |
1208 | /* add AIO support for compressed blocks ? */ |
1209 | ret = qcow2_decompress_cluster(bs, cluster_offset); | |
1210 | if (ret < 0) { | |
3fc48d09 | 1211 | goto fail; |
bd28f835 KW |
1212 | } |
1213 | ||
03396148 | 1214 | qemu_iovec_from_buf(&hd_qiov, 0, |
5ebaa27e | 1215 | s->cluster_cache + index_in_cluster * 512, |
faf575c1 | 1216 | 512 * cur_nr_sectors); |
68d000a3 KW |
1217 | break; |
1218 | ||
1219 | case QCOW2_CLUSTER_NORMAL: | |
5ebaa27e | 1220 | if ((cluster_offset & 511) != 0) { |
3fc48d09 FZ |
1221 | ret = -EIO; |
1222 | goto fail; | |
5ebaa27e | 1223 | } |
bd28f835 | 1224 | |
5ebaa27e FZ |
1225 | if (s->crypt_method) { |
1226 | /* | |
1227 | * For encrypted images, read everything into a temporary | |
1228 | * contiguous buffer on which the AES functions can work. | |
1229 | */ | |
3fc48d09 FZ |
1230 | if (!cluster_data) { |
1231 | cluster_data = | |
de82815d KW |
1232 | qemu_try_blockalign(bs->file, QCOW_MAX_CRYPT_CLUSTERS |
1233 | * s->cluster_size); | |
1234 | if (cluster_data == NULL) { | |
1235 | ret = -ENOMEM; | |
1236 | goto fail; | |
1237 | } | |
5ebaa27e FZ |
1238 | } |
1239 | ||
1240 | assert(cur_nr_sectors <= | |
1241 | QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors); | |
3fc48d09 FZ |
1242 | qemu_iovec_reset(&hd_qiov); |
1243 | qemu_iovec_add(&hd_qiov, cluster_data, | |
5ebaa27e FZ |
1244 | 512 * cur_nr_sectors); |
1245 | } | |
1246 | ||
1247 | BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO); | |
1248 | qemu_co_mutex_unlock(&s->lock); | |
1249 | ret = bdrv_co_readv(bs->file, | |
1250 | (cluster_offset >> 9) + index_in_cluster, | |
3fc48d09 | 1251 | cur_nr_sectors, &hd_qiov); |
5ebaa27e FZ |
1252 | qemu_co_mutex_lock(&s->lock); |
1253 | if (ret < 0) { | |
3fc48d09 | 1254 | goto fail; |
5ebaa27e FZ |
1255 | } |
1256 | if (s->crypt_method) { | |
3fc48d09 FZ |
1257 | qcow2_encrypt_sectors(s, sector_num, cluster_data, |
1258 | cluster_data, cur_nr_sectors, 0, &s->aes_decrypt_key); | |
03396148 MT |
1259 | qemu_iovec_from_buf(qiov, bytes_done, |
1260 | cluster_data, 512 * cur_nr_sectors); | |
5ebaa27e | 1261 | } |
68d000a3 KW |
1262 | break; |
1263 | ||
1264 | default: | |
1265 | g_assert_not_reached(); | |
1266 | ret = -EIO; | |
1267 | goto fail; | |
faf575c1 | 1268 | } |
f141eafe | 1269 | |
3fc48d09 FZ |
1270 | remaining_sectors -= cur_nr_sectors; |
1271 | sector_num += cur_nr_sectors; | |
1272 | bytes_done += cur_nr_sectors * 512; | |
5ebaa27e | 1273 | } |
3fc48d09 | 1274 | ret = 0; |
faf575c1 | 1275 | |
3fc48d09 | 1276 | fail: |
68d100e9 | 1277 | qemu_co_mutex_unlock(&s->lock); |
42496d62 | 1278 | |
3fc48d09 | 1279 | qemu_iovec_destroy(&hd_qiov); |
dea43a65 | 1280 | qemu_vfree(cluster_data); |
68d100e9 KW |
1281 | |
1282 | return ret; | |
585f8587 FB |
1283 | } |
1284 | ||
a968168c | 1285 | static coroutine_fn int qcow2_co_writev(BlockDriverState *bs, |
3fc48d09 FZ |
1286 | int64_t sector_num, |
1287 | int remaining_sectors, | |
1288 | QEMUIOVector *qiov) | |
585f8587 | 1289 | { |
585f8587 | 1290 | BDRVQcowState *s = bs->opaque; |
585f8587 | 1291 | int index_in_cluster; |
68d100e9 | 1292 | int ret; |
faf575c1 | 1293 | int cur_nr_sectors; /* number of sectors in current iteration */ |
c2bdd990 | 1294 | uint64_t cluster_offset; |
3fc48d09 FZ |
1295 | QEMUIOVector hd_qiov; |
1296 | uint64_t bytes_done = 0; | |
1297 | uint8_t *cluster_data = NULL; | |
8d2497c3 | 1298 | QCowL2Meta *l2meta = NULL; |
c2271403 | 1299 | |
3cce16f4 KW |
1300 | trace_qcow2_writev_start_req(qemu_coroutine_self(), sector_num, |
1301 | remaining_sectors); | |
1302 | ||
3fc48d09 FZ |
1303 | qemu_iovec_init(&hd_qiov, qiov->niov); |
1304 | ||
1305 | s->cluster_cache_offset = -1; /* disable compressed cache */ | |
3b46e624 | 1306 | |
3fc48d09 FZ |
1307 | qemu_co_mutex_lock(&s->lock); |
1308 | ||
1309 | while (remaining_sectors != 0) { | |
1310 | ||
f50f88b9 | 1311 | l2meta = NULL; |
cf5c1a23 | 1312 | |
3cce16f4 | 1313 | trace_qcow2_writev_start_part(qemu_coroutine_self()); |
3fc48d09 | 1314 | index_in_cluster = sector_num & (s->cluster_sectors - 1); |
16f0587e | 1315 | cur_nr_sectors = remaining_sectors; |
5ebaa27e | 1316 | if (s->crypt_method && |
16f0587e HT |
1317 | cur_nr_sectors > |
1318 | QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors - index_in_cluster) { | |
1319 | cur_nr_sectors = | |
1320 | QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors - index_in_cluster; | |
5ebaa27e | 1321 | } |
095a9c58 | 1322 | |
3fc48d09 | 1323 | ret = qcow2_alloc_cluster_offset(bs, sector_num << 9, |
16f0587e | 1324 | &cur_nr_sectors, &cluster_offset, &l2meta); |
5ebaa27e | 1325 | if (ret < 0) { |
3fc48d09 | 1326 | goto fail; |
5ebaa27e | 1327 | } |
148da7ea | 1328 | |
5ebaa27e | 1329 | assert((cluster_offset & 511) == 0); |
148da7ea | 1330 | |
3fc48d09 | 1331 | qemu_iovec_reset(&hd_qiov); |
1b093c48 | 1332 | qemu_iovec_concat(&hd_qiov, qiov, bytes_done, |
5ebaa27e | 1333 | cur_nr_sectors * 512); |
6f5f060b | 1334 | |
5ebaa27e | 1335 | if (s->crypt_method) { |
3fc48d09 | 1336 | if (!cluster_data) { |
de82815d KW |
1337 | cluster_data = qemu_try_blockalign(bs->file, |
1338 | QCOW_MAX_CRYPT_CLUSTERS | |
1339 | * s->cluster_size); | |
1340 | if (cluster_data == NULL) { | |
1341 | ret = -ENOMEM; | |
1342 | goto fail; | |
1343 | } | |
5ebaa27e | 1344 | } |
6f5f060b | 1345 | |
3fc48d09 | 1346 | assert(hd_qiov.size <= |
5ebaa27e | 1347 | QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size); |
d5e6b161 | 1348 | qemu_iovec_to_buf(&hd_qiov, 0, cluster_data, hd_qiov.size); |
6f5f060b | 1349 | |
3fc48d09 FZ |
1350 | qcow2_encrypt_sectors(s, sector_num, cluster_data, |
1351 | cluster_data, cur_nr_sectors, 1, &s->aes_encrypt_key); | |
6f5f060b | 1352 | |
3fc48d09 FZ |
1353 | qemu_iovec_reset(&hd_qiov); |
1354 | qemu_iovec_add(&hd_qiov, cluster_data, | |
5ebaa27e FZ |
1355 | cur_nr_sectors * 512); |
1356 | } | |
6f5f060b | 1357 | |
231bb267 | 1358 | ret = qcow2_pre_write_overlap_check(bs, 0, |
cf93980e HR |
1359 | cluster_offset + index_in_cluster * BDRV_SECTOR_SIZE, |
1360 | cur_nr_sectors * BDRV_SECTOR_SIZE); | |
1361 | if (ret < 0) { | |
1362 | goto fail; | |
1363 | } | |
1364 | ||
5ebaa27e | 1365 | qemu_co_mutex_unlock(&s->lock); |
67a7a0eb | 1366 | BLKDBG_EVENT(bs->file, BLKDBG_WRITE_AIO); |
3cce16f4 KW |
1367 | trace_qcow2_writev_data(qemu_coroutine_self(), |
1368 | (cluster_offset >> 9) + index_in_cluster); | |
5ebaa27e FZ |
1369 | ret = bdrv_co_writev(bs->file, |
1370 | (cluster_offset >> 9) + index_in_cluster, | |
3fc48d09 | 1371 | cur_nr_sectors, &hd_qiov); |
5ebaa27e FZ |
1372 | qemu_co_mutex_lock(&s->lock); |
1373 | if (ret < 0) { | |
3fc48d09 | 1374 | goto fail; |
5ebaa27e | 1375 | } |
f141eafe | 1376 | |
88c6588c KW |
1377 | while (l2meta != NULL) { |
1378 | QCowL2Meta *next; | |
1379 | ||
f50f88b9 KW |
1380 | ret = qcow2_alloc_cluster_link_l2(bs, l2meta); |
1381 | if (ret < 0) { | |
1382 | goto fail; | |
1383 | } | |
faf575c1 | 1384 | |
4e95314e KW |
1385 | /* Take the request off the list of running requests */ |
1386 | if (l2meta->nb_clusters != 0) { | |
1387 | QLIST_REMOVE(l2meta, next_in_flight); | |
1388 | } | |
1389 | ||
4e95314e | 1390 | qemu_co_queue_restart_all(&l2meta->dependent_requests); |
4e95314e | 1391 | |
88c6588c | 1392 | next = l2meta->next; |
f50f88b9 | 1393 | g_free(l2meta); |
88c6588c | 1394 | l2meta = next; |
f50f88b9 | 1395 | } |
0fa9131a | 1396 | |
3fc48d09 FZ |
1397 | remaining_sectors -= cur_nr_sectors; |
1398 | sector_num += cur_nr_sectors; | |
1399 | bytes_done += cur_nr_sectors * 512; | |
3cce16f4 | 1400 | trace_qcow2_writev_done_part(qemu_coroutine_self(), cur_nr_sectors); |
5ebaa27e | 1401 | } |
3fc48d09 | 1402 | ret = 0; |
faf575c1 | 1403 | |
3fc48d09 | 1404 | fail: |
4e95314e KW |
1405 | qemu_co_mutex_unlock(&s->lock); |
1406 | ||
88c6588c KW |
1407 | while (l2meta != NULL) { |
1408 | QCowL2Meta *next; | |
1409 | ||
4e95314e KW |
1410 | if (l2meta->nb_clusters != 0) { |
1411 | QLIST_REMOVE(l2meta, next_in_flight); | |
1412 | } | |
1413 | qemu_co_queue_restart_all(&l2meta->dependent_requests); | |
88c6588c KW |
1414 | |
1415 | next = l2meta->next; | |
cf5c1a23 | 1416 | g_free(l2meta); |
88c6588c | 1417 | l2meta = next; |
cf5c1a23 | 1418 | } |
0fa9131a | 1419 | |
3fc48d09 | 1420 | qemu_iovec_destroy(&hd_qiov); |
dea43a65 | 1421 | qemu_vfree(cluster_data); |
3cce16f4 | 1422 | trace_qcow2_writev_done_req(qemu_coroutine_self(), ret); |
42496d62 | 1423 | |
68d100e9 | 1424 | return ret; |
585f8587 FB |
1425 | } |
1426 | ||
7c80ab3f | 1427 | static void qcow2_close(BlockDriverState *bs) |
585f8587 FB |
1428 | { |
1429 | BDRVQcowState *s = bs->opaque; | |
de82815d | 1430 | qemu_vfree(s->l1_table); |
cf93980e HR |
1431 | /* else pre-write overlap checks in cache_destroy may crash */ |
1432 | s->l1_table = NULL; | |
29c1a730 | 1433 | |
27eb6c09 | 1434 | if (!(bs->open_flags & BDRV_O_INCOMING)) { |
3b5e14c7 | 1435 | int ret1, ret2; |
29c1a730 | 1436 | |
3b5e14c7 HR |
1437 | ret1 = qcow2_cache_flush(bs, s->l2_table_cache); |
1438 | ret2 = qcow2_cache_flush(bs, s->refcount_block_cache); | |
1439 | ||
1440 | if (ret1) { | |
1441 | error_report("Failed to flush the L2 table cache: %s", | |
1442 | strerror(-ret1)); | |
1443 | } | |
1444 | if (ret2) { | |
1445 | error_report("Failed to flush the refcount block cache: %s", | |
1446 | strerror(-ret2)); | |
1447 | } | |
1448 | ||
1449 | if (!ret1 && !ret2) { | |
1450 | qcow2_mark_clean(bs); | |
1451 | } | |
27eb6c09 | 1452 | } |
c61d0004 | 1453 | |
29c1a730 KW |
1454 | qcow2_cache_destroy(bs, s->l2_table_cache); |
1455 | qcow2_cache_destroy(bs, s->refcount_block_cache); | |
1456 | ||
6744cbab | 1457 | g_free(s->unknown_header_fields); |
75bab85c | 1458 | cleanup_unknown_header_ext(bs); |
6744cbab | 1459 | |
7267c094 | 1460 | g_free(s->cluster_cache); |
dea43a65 | 1461 | qemu_vfree(s->cluster_data); |
ed6ccf0f | 1462 | qcow2_refcount_close(bs); |
28c1202b | 1463 | qcow2_free_snapshots(bs); |
585f8587 FB |
1464 | } |
1465 | ||
5a8a30db | 1466 | static void qcow2_invalidate_cache(BlockDriverState *bs, Error **errp) |
06d9260f AL |
1467 | { |
1468 | BDRVQcowState *s = bs->opaque; | |
1469 | int flags = s->flags; | |
1470 | AES_KEY aes_encrypt_key; | |
1471 | AES_KEY aes_decrypt_key; | |
1472 | uint32_t crypt_method = 0; | |
acdfb480 | 1473 | QDict *options; |
5a8a30db KW |
1474 | Error *local_err = NULL; |
1475 | int ret; | |
06d9260f AL |
1476 | |
1477 | /* | |
1478 | * Backing files are read-only which makes all of their metadata immutable, | |
1479 | * that means we don't have to worry about reopening them here. | |
1480 | */ | |
1481 | ||
1482 | if (s->crypt_method) { | |
1483 | crypt_method = s->crypt_method; | |
1484 | memcpy(&aes_encrypt_key, &s->aes_encrypt_key, sizeof(aes_encrypt_key)); | |
1485 | memcpy(&aes_decrypt_key, &s->aes_decrypt_key, sizeof(aes_decrypt_key)); | |
1486 | } | |
1487 | ||
1488 | qcow2_close(bs); | |
1489 | ||
5a8a30db KW |
1490 | bdrv_invalidate_cache(bs->file, &local_err); |
1491 | if (local_err) { | |
1492 | error_propagate(errp, local_err); | |
1493 | return; | |
1494 | } | |
3456a8d1 | 1495 | |
06d9260f | 1496 | memset(s, 0, sizeof(BDRVQcowState)); |
d475e5ac | 1497 | options = qdict_clone_shallow(bs->options); |
5a8a30db KW |
1498 | |
1499 | ret = qcow2_open(bs, options, flags, &local_err); | |
a1904e48 | 1500 | QDECREF(options); |
5a8a30db KW |
1501 | if (local_err) { |
1502 | error_setg(errp, "Could not reopen qcow2 layer: %s", | |
1503 | error_get_pretty(local_err)); | |
1504 | error_free(local_err); | |
1505 | return; | |
1506 | } else if (ret < 0) { | |
1507 | error_setg_errno(errp, -ret, "Could not reopen qcow2 layer"); | |
1508 | return; | |
1509 | } | |
acdfb480 | 1510 | |
06d9260f AL |
1511 | if (crypt_method) { |
1512 | s->crypt_method = crypt_method; | |
1513 | memcpy(&s->aes_encrypt_key, &aes_encrypt_key, sizeof(aes_encrypt_key)); | |
1514 | memcpy(&s->aes_decrypt_key, &aes_decrypt_key, sizeof(aes_decrypt_key)); | |
1515 | } | |
1516 | } | |
1517 | ||
e24e49e6 KW |
1518 | static size_t header_ext_add(char *buf, uint32_t magic, const void *s, |
1519 | size_t len, size_t buflen) | |
1520 | { | |
1521 | QCowExtension *ext_backing_fmt = (QCowExtension*) buf; | |
1522 | size_t ext_len = sizeof(QCowExtension) + ((len + 7) & ~7); | |
1523 | ||
1524 | if (buflen < ext_len) { | |
1525 | return -ENOSPC; | |
1526 | } | |
1527 | ||
1528 | *ext_backing_fmt = (QCowExtension) { | |
1529 | .magic = cpu_to_be32(magic), | |
1530 | .len = cpu_to_be32(len), | |
1531 | }; | |
1532 | memcpy(buf + sizeof(QCowExtension), s, len); | |
1533 | ||
1534 | return ext_len; | |
1535 | } | |
1536 | ||
756e6736 | 1537 | /* |
e24e49e6 KW |
1538 | * Updates the qcow2 header, including the variable length parts of it, i.e. |
1539 | * the backing file name and all extensions. qcow2 was not designed to allow | |
1540 | * such changes, so if we run out of space (we can only use the first cluster) | |
1541 | * this function may fail. | |
756e6736 KW |
1542 | * |
1543 | * Returns 0 on success, -errno in error cases. | |
1544 | */ | |
e24e49e6 | 1545 | int qcow2_update_header(BlockDriverState *bs) |
756e6736 | 1546 | { |
756e6736 | 1547 | BDRVQcowState *s = bs->opaque; |
e24e49e6 KW |
1548 | QCowHeader *header; |
1549 | char *buf; | |
1550 | size_t buflen = s->cluster_size; | |
756e6736 | 1551 | int ret; |
e24e49e6 KW |
1552 | uint64_t total_size; |
1553 | uint32_t refcount_table_clusters; | |
6744cbab | 1554 | size_t header_length; |
75bab85c | 1555 | Qcow2UnknownHeaderExtension *uext; |
756e6736 | 1556 | |
e24e49e6 | 1557 | buf = qemu_blockalign(bs, buflen); |
756e6736 | 1558 | |
e24e49e6 KW |
1559 | /* Header structure */ |
1560 | header = (QCowHeader*) buf; | |
756e6736 | 1561 | |
e24e49e6 KW |
1562 | if (buflen < sizeof(*header)) { |
1563 | ret = -ENOSPC; | |
1564 | goto fail; | |
756e6736 KW |
1565 | } |
1566 | ||
6744cbab | 1567 | header_length = sizeof(*header) + s->unknown_header_fields_size; |
e24e49e6 KW |
1568 | total_size = bs->total_sectors * BDRV_SECTOR_SIZE; |
1569 | refcount_table_clusters = s->refcount_table_size >> (s->cluster_bits - 3); | |
1570 | ||
1571 | *header = (QCowHeader) { | |
6744cbab | 1572 | /* Version 2 fields */ |
e24e49e6 | 1573 | .magic = cpu_to_be32(QCOW_MAGIC), |
6744cbab | 1574 | .version = cpu_to_be32(s->qcow_version), |
e24e49e6 KW |
1575 | .backing_file_offset = 0, |
1576 | .backing_file_size = 0, | |
1577 | .cluster_bits = cpu_to_be32(s->cluster_bits), | |
1578 | .size = cpu_to_be64(total_size), | |
1579 | .crypt_method = cpu_to_be32(s->crypt_method_header), | |
1580 | .l1_size = cpu_to_be32(s->l1_size), | |
1581 | .l1_table_offset = cpu_to_be64(s->l1_table_offset), | |
1582 | .refcount_table_offset = cpu_to_be64(s->refcount_table_offset), | |
1583 | .refcount_table_clusters = cpu_to_be32(refcount_table_clusters), | |
1584 | .nb_snapshots = cpu_to_be32(s->nb_snapshots), | |
1585 | .snapshots_offset = cpu_to_be64(s->snapshots_offset), | |
6744cbab KW |
1586 | |
1587 | /* Version 3 fields */ | |
1588 | .incompatible_features = cpu_to_be64(s->incompatible_features), | |
1589 | .compatible_features = cpu_to_be64(s->compatible_features), | |
1590 | .autoclear_features = cpu_to_be64(s->autoclear_features), | |
b6481f37 | 1591 | .refcount_order = cpu_to_be32(s->refcount_order), |
6744cbab | 1592 | .header_length = cpu_to_be32(header_length), |
e24e49e6 | 1593 | }; |
756e6736 | 1594 | |
6744cbab KW |
1595 | /* For older versions, write a shorter header */ |
1596 | switch (s->qcow_version) { | |
1597 | case 2: | |
1598 | ret = offsetof(QCowHeader, incompatible_features); | |
1599 | break; | |
1600 | case 3: | |
1601 | ret = sizeof(*header); | |
1602 | break; | |
1603 | default: | |
b6c14762 JM |
1604 | ret = -EINVAL; |
1605 | goto fail; | |
6744cbab KW |
1606 | } |
1607 | ||
1608 | buf += ret; | |
1609 | buflen -= ret; | |
1610 | memset(buf, 0, buflen); | |
1611 | ||
1612 | /* Preserve any unknown field in the header */ | |
1613 | if (s->unknown_header_fields_size) { | |
1614 | if (buflen < s->unknown_header_fields_size) { | |
1615 | ret = -ENOSPC; | |
1616 | goto fail; | |
1617 | } | |
1618 | ||
1619 | memcpy(buf, s->unknown_header_fields, s->unknown_header_fields_size); | |
1620 | buf += s->unknown_header_fields_size; | |
1621 | buflen -= s->unknown_header_fields_size; | |
1622 | } | |
756e6736 | 1623 | |
e24e49e6 KW |
1624 | /* Backing file format header extension */ |
1625 | if (*bs->backing_format) { | |
1626 | ret = header_ext_add(buf, QCOW2_EXT_MAGIC_BACKING_FORMAT, | |
1627 | bs->backing_format, strlen(bs->backing_format), | |
1628 | buflen); | |
1629 | if (ret < 0) { | |
1630 | goto fail; | |
756e6736 KW |
1631 | } |
1632 | ||
e24e49e6 KW |
1633 | buf += ret; |
1634 | buflen -= ret; | |
756e6736 KW |
1635 | } |
1636 | ||
cfcc4c62 KW |
1637 | /* Feature table */ |
1638 | Qcow2Feature features[] = { | |
c61d0004 SH |
1639 | { |
1640 | .type = QCOW2_FEAT_TYPE_INCOMPATIBLE, | |
1641 | .bit = QCOW2_INCOMPAT_DIRTY_BITNR, | |
1642 | .name = "dirty bit", | |
1643 | }, | |
69c98726 HR |
1644 | { |
1645 | .type = QCOW2_FEAT_TYPE_INCOMPATIBLE, | |
1646 | .bit = QCOW2_INCOMPAT_CORRUPT_BITNR, | |
1647 | .name = "corrupt bit", | |
1648 | }, | |
bfe8043e SH |
1649 | { |
1650 | .type = QCOW2_FEAT_TYPE_COMPATIBLE, | |
1651 | .bit = QCOW2_COMPAT_LAZY_REFCOUNTS_BITNR, | |
1652 | .name = "lazy refcounts", | |
1653 | }, | |
cfcc4c62 KW |
1654 | }; |
1655 | ||
1656 | ret = header_ext_add(buf, QCOW2_EXT_MAGIC_FEATURE_TABLE, | |
1657 | features, sizeof(features), buflen); | |
1658 | if (ret < 0) { | |
1659 | goto fail; | |
1660 | } | |
1661 | buf += ret; | |
1662 | buflen -= ret; | |
1663 | ||
75bab85c KW |
1664 | /* Keep unknown header extensions */ |
1665 | QLIST_FOREACH(uext, &s->unknown_header_ext, next) { | |
1666 | ret = header_ext_add(buf, uext->magic, uext->data, uext->len, buflen); | |
1667 | if (ret < 0) { | |
1668 | goto fail; | |
1669 | } | |
1670 | ||
1671 | buf += ret; | |
1672 | buflen -= ret; | |
1673 | } | |
1674 | ||
e24e49e6 KW |
1675 | /* End of header extensions */ |
1676 | ret = header_ext_add(buf, QCOW2_EXT_MAGIC_END, NULL, 0, buflen); | |
756e6736 KW |
1677 | if (ret < 0) { |
1678 | goto fail; | |
1679 | } | |
1680 | ||
e24e49e6 KW |
1681 | buf += ret; |
1682 | buflen -= ret; | |
756e6736 | 1683 | |
e24e49e6 KW |
1684 | /* Backing file name */ |
1685 | if (*bs->backing_file) { | |
1686 | size_t backing_file_len = strlen(bs->backing_file); | |
1687 | ||
1688 | if (buflen < backing_file_len) { | |
1689 | ret = -ENOSPC; | |
1690 | goto fail; | |
1691 | } | |
1692 | ||
00ea1881 | 1693 | /* Using strncpy is ok here, since buf is not NUL-terminated. */ |
e24e49e6 KW |
1694 | strncpy(buf, bs->backing_file, buflen); |
1695 | ||
1696 | header->backing_file_offset = cpu_to_be64(buf - ((char*) header)); | |
1697 | header->backing_file_size = cpu_to_be32(backing_file_len); | |
756e6736 KW |
1698 | } |
1699 | ||
e24e49e6 KW |
1700 | /* Write the new header */ |
1701 | ret = bdrv_pwrite(bs->file, 0, header, s->cluster_size); | |
756e6736 KW |
1702 | if (ret < 0) { |
1703 | goto fail; | |
1704 | } | |
1705 | ||
1706 | ret = 0; | |
1707 | fail: | |
e24e49e6 | 1708 | qemu_vfree(header); |
756e6736 KW |
1709 | return ret; |
1710 | } | |
1711 | ||
1712 | static int qcow2_change_backing_file(BlockDriverState *bs, | |
1713 | const char *backing_file, const char *backing_fmt) | |
1714 | { | |
e24e49e6 KW |
1715 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: ""); |
1716 | pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: ""); | |
1717 | ||
1718 | return qcow2_update_header(bs); | |
756e6736 KW |
1719 | } |
1720 | ||
a35e1c17 KW |
1721 | static int preallocate(BlockDriverState *bs) |
1722 | { | |
a35e1c17 KW |
1723 | uint64_t nb_sectors; |
1724 | uint64_t offset; | |
060bee89 | 1725 | uint64_t host_offset = 0; |
a35e1c17 | 1726 | int num; |
148da7ea | 1727 | int ret; |
f50f88b9 | 1728 | QCowL2Meta *meta; |
a35e1c17 | 1729 | |
57322b78 | 1730 | nb_sectors = bdrv_nb_sectors(bs); |
a35e1c17 KW |
1731 | offset = 0; |
1732 | ||
1733 | while (nb_sectors) { | |
7c2bbf4a | 1734 | num = MIN(nb_sectors, INT_MAX >> BDRV_SECTOR_BITS); |
16f0587e | 1735 | ret = qcow2_alloc_cluster_offset(bs, offset, &num, |
060bee89 | 1736 | &host_offset, &meta); |
148da7ea | 1737 | if (ret < 0) { |
19dbcbf7 | 1738 | return ret; |
a35e1c17 KW |
1739 | } |
1740 | ||
c792707f SH |
1741 | while (meta) { |
1742 | QCowL2Meta *next = meta->next; | |
1743 | ||
7c2bbf4a HT |
1744 | ret = qcow2_alloc_cluster_link_l2(bs, meta); |
1745 | if (ret < 0) { | |
1746 | qcow2_free_any_clusters(bs, meta->alloc_offset, | |
1747 | meta->nb_clusters, QCOW2_DISCARD_NEVER); | |
1748 | return ret; | |
1749 | } | |
1750 | ||
1751 | /* There are no dependent requests, but we need to remove our | |
1752 | * request from the list of in-flight requests */ | |
4e95314e | 1753 | QLIST_REMOVE(meta, next_in_flight); |
c792707f SH |
1754 | |
1755 | g_free(meta); | |
1756 | meta = next; | |
f50f88b9 | 1757 | } |
f214978a | 1758 | |
a35e1c17 KW |
1759 | /* TODO Preallocate data if requested */ |
1760 | ||
1761 | nb_sectors -= num; | |
7c2bbf4a | 1762 | offset += num << BDRV_SECTOR_BITS; |
a35e1c17 KW |
1763 | } |
1764 | ||
1765 | /* | |
1766 | * It is expected that the image file is large enough to actually contain | |
1767 | * all of the allocated clusters (otherwise we get failing reads after | |
1768 | * EOF). Extend the image to the last allocated sector. | |
1769 | */ | |
060bee89 | 1770 | if (host_offset != 0) { |
7c2bbf4a HT |
1771 | uint8_t buf[BDRV_SECTOR_SIZE]; |
1772 | memset(buf, 0, BDRV_SECTOR_SIZE); | |
1773 | ret = bdrv_write(bs->file, (host_offset >> BDRV_SECTOR_BITS) + num - 1, | |
1774 | buf, 1); | |
19dbcbf7 KW |
1775 | if (ret < 0) { |
1776 | return ret; | |
1777 | } | |
a35e1c17 KW |
1778 | } |
1779 | ||
1780 | return 0; | |
1781 | } | |
1782 | ||
7c80ab3f JS |
1783 | static int qcow2_create2(const char *filename, int64_t total_size, |
1784 | const char *backing_file, const char *backing_format, | |
ffeaac9b | 1785 | int flags, size_t cluster_size, PreallocMode prealloc, |
1bd0e2d1 | 1786 | QemuOpts *opts, int version, |
3ef6c40a | 1787 | Error **errp) |
a9420734 | 1788 | { |
9b2260cb | 1789 | /* Calculate cluster_bits */ |
a9420734 KW |
1790 | int cluster_bits; |
1791 | cluster_bits = ffs(cluster_size) - 1; | |
1792 | if (cluster_bits < MIN_CLUSTER_BITS || cluster_bits > MAX_CLUSTER_BITS || | |
1793 | (1 << cluster_bits) != cluster_size) | |
1794 | { | |
3ef6c40a HR |
1795 | error_setg(errp, "Cluster size must be a power of two between %d and " |
1796 | "%dk", 1 << MIN_CLUSTER_BITS, 1 << (MAX_CLUSTER_BITS - 10)); | |
a9420734 KW |
1797 | return -EINVAL; |
1798 | } | |
1799 | ||
1800 | /* | |
1801 | * Open the image file and write a minimal qcow2 header. | |
1802 | * | |
1803 | * We keep things simple and start with a zero-sized image. We also | |
1804 | * do without refcount blocks or a L1 table for now. We'll fix the | |
1805 | * inconsistency later. | |
1806 | * | |
1807 | * We do need a refcount table because growing the refcount table means | |
1808 | * allocating two new refcount blocks - the seconds of which would be at | |
1809 | * 2 GB for 64k clusters, and we don't want to have a 2 GB initial file | |
1810 | * size for any qcow2 image. | |
1811 | */ | |
1812 | BlockDriverState* bs; | |
f8413b3c | 1813 | QCowHeader *header; |
b106ad91 | 1814 | uint64_t* refcount_table; |
3ef6c40a | 1815 | Error *local_err = NULL; |
a9420734 KW |
1816 | int ret; |
1817 | ||
0e4271b7 HT |
1818 | if (prealloc == PREALLOC_MODE_FULL || prealloc == PREALLOC_MODE_FALLOC) { |
1819 | int64_t meta_size = 0; | |
1820 | uint64_t nreftablee, nrefblocke, nl1e, nl2e; | |
1821 | int64_t aligned_total_size = align_offset(total_size, cluster_size); | |
1822 | ||
1823 | /* header: 1 cluster */ | |
1824 | meta_size += cluster_size; | |
1825 | ||
1826 | /* total size of L2 tables */ | |
1827 | nl2e = aligned_total_size / cluster_size; | |
1828 | nl2e = align_offset(nl2e, cluster_size / sizeof(uint64_t)); | |
1829 | meta_size += nl2e * sizeof(uint64_t); | |
1830 | ||
1831 | /* total size of L1 tables */ | |
1832 | nl1e = nl2e * sizeof(uint64_t) / cluster_size; | |
1833 | nl1e = align_offset(nl1e, cluster_size / sizeof(uint64_t)); | |
1834 | meta_size += nl1e * sizeof(uint64_t); | |
1835 | ||
1836 | /* total size of refcount blocks | |
1837 | * | |
1838 | * note: every host cluster is reference-counted, including metadata | |
1839 | * (even refcount blocks are recursively included). | |
1840 | * Let: | |
1841 | * a = total_size (this is the guest disk size) | |
1842 | * m = meta size not including refcount blocks and refcount tables | |
1843 | * c = cluster size | |
1844 | * y1 = number of refcount blocks entries | |
1845 | * y2 = meta size including everything | |
1846 | * then, | |
1847 | * y1 = (y2 + a)/c | |
1848 | * y2 = y1 * sizeof(u16) + y1 * sizeof(u16) * sizeof(u64) / c + m | |
1849 | * we can get y1: | |
1850 | * y1 = (a + m) / (c - sizeof(u16) - sizeof(u16) * sizeof(u64) / c) | |
1851 | */ | |
1852 | nrefblocke = (aligned_total_size + meta_size + cluster_size) / | |
1853 | (cluster_size - sizeof(uint16_t) - | |
1854 | 1.0 * sizeof(uint16_t) * sizeof(uint64_t) / cluster_size); | |
1855 | nrefblocke = align_offset(nrefblocke, cluster_size / sizeof(uint16_t)); | |
1856 | meta_size += nrefblocke * sizeof(uint16_t); | |
1857 | ||
1858 | /* total size of refcount tables */ | |
1859 | nreftablee = nrefblocke * sizeof(uint16_t) / cluster_size; | |
1860 | nreftablee = align_offset(nreftablee, cluster_size / sizeof(uint64_t)); | |
1861 | meta_size += nreftablee * sizeof(uint64_t); | |
1862 | ||
1863 | qemu_opt_set_number(opts, BLOCK_OPT_SIZE, | |
39101f25 | 1864 | aligned_total_size + meta_size, &error_abort); |
f43e47db MA |
1865 | qemu_opt_set(opts, BLOCK_OPT_PREALLOC, PreallocMode_lookup[prealloc], |
1866 | &error_abort); | |
0e4271b7 HT |
1867 | } |
1868 | ||
c282e1fd | 1869 | ret = bdrv_create_file(filename, opts, &local_err); |
a9420734 | 1870 | if (ret < 0) { |
3ef6c40a | 1871 | error_propagate(errp, local_err); |
a9420734 KW |
1872 | return ret; |
1873 | } | |
1874 | ||
2e40134b HR |
1875 | bs = NULL; |
1876 | ret = bdrv_open(&bs, filename, NULL, NULL, BDRV_O_RDWR | BDRV_O_PROTOCOL, | |
1877 | NULL, &local_err); | |
a9420734 | 1878 | if (ret < 0) { |
3ef6c40a | 1879 | error_propagate(errp, local_err); |
a9420734 KW |
1880 | return ret; |
1881 | } | |
1882 | ||
1883 | /* Write the header */ | |
f8413b3c KW |
1884 | QEMU_BUILD_BUG_ON((1 << MIN_CLUSTER_BITS) < sizeof(*header)); |
1885 | header = g_malloc0(cluster_size); | |
1886 | *header = (QCowHeader) { | |
1887 | .magic = cpu_to_be32(QCOW_MAGIC), | |
1888 | .version = cpu_to_be32(version), | |
1889 | .cluster_bits = cpu_to_be32(cluster_bits), | |
1890 | .size = cpu_to_be64(0), | |
1891 | .l1_table_offset = cpu_to_be64(0), | |
1892 | .l1_size = cpu_to_be32(0), | |
1893 | .refcount_table_offset = cpu_to_be64(cluster_size), | |
1894 | .refcount_table_clusters = cpu_to_be32(1), | |
17bd5f47 | 1895 | .refcount_order = cpu_to_be32(4), |
f8413b3c KW |
1896 | .header_length = cpu_to_be32(sizeof(*header)), |
1897 | }; | |
a9420734 KW |
1898 | |
1899 | if (flags & BLOCK_FLAG_ENCRYPT) { | |
f8413b3c | 1900 | header->crypt_method = cpu_to_be32(QCOW_CRYPT_AES); |
a9420734 | 1901 | } else { |
f8413b3c | 1902 | header->crypt_method = cpu_to_be32(QCOW_CRYPT_NONE); |
a9420734 KW |
1903 | } |
1904 | ||
bfe8043e | 1905 | if (flags & BLOCK_FLAG_LAZY_REFCOUNTS) { |
f8413b3c | 1906 | header->compatible_features |= |
bfe8043e SH |
1907 | cpu_to_be64(QCOW2_COMPAT_LAZY_REFCOUNTS); |
1908 | } | |
1909 | ||
f8413b3c KW |
1910 | ret = bdrv_pwrite(bs, 0, header, cluster_size); |
1911 | g_free(header); | |
a9420734 | 1912 | if (ret < 0) { |
3ef6c40a | 1913 | error_setg_errno(errp, -ret, "Could not write qcow2 header"); |
a9420734 KW |
1914 | goto out; |
1915 | } | |
1916 | ||
b106ad91 KW |
1917 | /* Write a refcount table with one refcount block */ |
1918 | refcount_table = g_malloc0(2 * cluster_size); | |
1919 | refcount_table[0] = cpu_to_be64(2 * cluster_size); | |
1920 | ret = bdrv_pwrite(bs, cluster_size, refcount_table, 2 * cluster_size); | |
7267c094 | 1921 | g_free(refcount_table); |
a9420734 KW |
1922 | |
1923 | if (ret < 0) { | |
3ef6c40a | 1924 | error_setg_errno(errp, -ret, "Could not write refcount table"); |
a9420734 KW |
1925 | goto out; |
1926 | } | |
1927 | ||
f67503e5 HR |
1928 | bdrv_unref(bs); |
1929 | bs = NULL; | |
a9420734 KW |
1930 | |
1931 | /* | |
1932 | * And now open the image and make it consistent first (i.e. increase the | |
1933 | * refcount of the cluster that is occupied by the header and the refcount | |
1934 | * table) | |
1935 | */ | |
ddf5636d | 1936 | ret = bdrv_open(&bs, filename, NULL, NULL, |
ef810437 HR |
1937 | BDRV_O_RDWR | BDRV_O_CACHE_WB | BDRV_O_NO_FLUSH, |
1938 | &bdrv_qcow2, &local_err); | |
a9420734 | 1939 | if (ret < 0) { |
3ef6c40a | 1940 | error_propagate(errp, local_err); |
a9420734 KW |
1941 | goto out; |
1942 | } | |
1943 | ||
b106ad91 | 1944 | ret = qcow2_alloc_clusters(bs, 3 * cluster_size); |
a9420734 | 1945 | if (ret < 0) { |
3ef6c40a HR |
1946 | error_setg_errno(errp, -ret, "Could not allocate clusters for qcow2 " |
1947 | "header and refcount table"); | |
a9420734 KW |
1948 | goto out; |
1949 | ||
1950 | } else if (ret != 0) { | |
1951 | error_report("Huh, first cluster in empty image is already in use?"); | |
1952 | abort(); | |
1953 | } | |
1954 | ||
1955 | /* Okay, now that we have a valid image, let's give it the right size */ | |
180e9526 | 1956 | ret = bdrv_truncate(bs, total_size); |
a9420734 | 1957 | if (ret < 0) { |
3ef6c40a | 1958 | error_setg_errno(errp, -ret, "Could not resize image"); |
a9420734 KW |
1959 | goto out; |
1960 | } | |
1961 | ||
1962 | /* Want a backing file? There you go.*/ | |
1963 | if (backing_file) { | |
1964 | ret = bdrv_change_backing_file(bs, backing_file, backing_format); | |
1965 | if (ret < 0) { | |
3ef6c40a HR |
1966 | error_setg_errno(errp, -ret, "Could not assign backing file '%s' " |
1967 | "with format '%s'", backing_file, backing_format); | |
a9420734 KW |
1968 | goto out; |
1969 | } | |
1970 | } | |
1971 | ||
1972 | /* And if we're supposed to preallocate metadata, do that now */ | |
0e4271b7 | 1973 | if (prealloc != PREALLOC_MODE_OFF) { |
15552c4a ZYW |
1974 | BDRVQcowState *s = bs->opaque; |
1975 | qemu_co_mutex_lock(&s->lock); | |
a9420734 | 1976 | ret = preallocate(bs); |
15552c4a | 1977 | qemu_co_mutex_unlock(&s->lock); |
a9420734 | 1978 | if (ret < 0) { |
3ef6c40a | 1979 | error_setg_errno(errp, -ret, "Could not preallocate metadata"); |
a9420734 KW |
1980 | goto out; |
1981 | } | |
1982 | } | |
1983 | ||
f67503e5 HR |
1984 | bdrv_unref(bs); |
1985 | bs = NULL; | |
ba2ab2f2 HR |
1986 | |
1987 | /* Reopen the image without BDRV_O_NO_FLUSH to flush it before returning */ | |
ddf5636d | 1988 | ret = bdrv_open(&bs, filename, NULL, NULL, |
c9fbb99d | 1989 | BDRV_O_RDWR | BDRV_O_CACHE_WB | BDRV_O_NO_BACKING, |
ef810437 | 1990 | &bdrv_qcow2, &local_err); |
84d18f06 | 1991 | if (local_err) { |
ba2ab2f2 HR |
1992 | error_propagate(errp, local_err); |
1993 | goto out; | |
1994 | } | |
1995 | ||
a9420734 KW |
1996 | ret = 0; |
1997 | out: | |
f67503e5 HR |
1998 | if (bs) { |
1999 | bdrv_unref(bs); | |
2000 | } | |
a9420734 KW |
2001 | return ret; |
2002 | } | |
de5f3f40 | 2003 | |
1bd0e2d1 | 2004 | static int qcow2_create(const char *filename, QemuOpts *opts, Error **errp) |
de5f3f40 | 2005 | { |
1bd0e2d1 CL |
2006 | char *backing_file = NULL; |
2007 | char *backing_fmt = NULL; | |
2008 | char *buf = NULL; | |
180e9526 | 2009 | uint64_t size = 0; |
de5f3f40 | 2010 | int flags = 0; |
99cce9fa | 2011 | size_t cluster_size = DEFAULT_CLUSTER_SIZE; |
ffeaac9b | 2012 | PreallocMode prealloc; |
8ad1898c | 2013 | int version = 3; |
3ef6c40a HR |
2014 | Error *local_err = NULL; |
2015 | int ret; | |
de5f3f40 KW |
2016 | |
2017 | /* Read out options */ | |
180e9526 HT |
2018 | size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), |
2019 | BDRV_SECTOR_SIZE); | |
1bd0e2d1 CL |
2020 | backing_file = qemu_opt_get_del(opts, BLOCK_OPT_BACKING_FILE); |
2021 | backing_fmt = qemu_opt_get_del(opts, BLOCK_OPT_BACKING_FMT); | |
2022 | if (qemu_opt_get_bool_del(opts, BLOCK_OPT_ENCRYPT, false)) { | |
2023 | flags |= BLOCK_FLAG_ENCRYPT; | |
2024 | } | |
2025 | cluster_size = qemu_opt_get_size_del(opts, BLOCK_OPT_CLUSTER_SIZE, | |
2026 | DEFAULT_CLUSTER_SIZE); | |
2027 | buf = qemu_opt_get_del(opts, BLOCK_OPT_PREALLOC); | |
ffeaac9b HT |
2028 | prealloc = qapi_enum_parse(PreallocMode_lookup, buf, |
2029 | PREALLOC_MODE_MAX, PREALLOC_MODE_OFF, | |
2030 | &local_err); | |
2031 | if (local_err) { | |
2032 | error_propagate(errp, local_err); | |
1bd0e2d1 CL |
2033 | ret = -EINVAL; |
2034 | goto finish; | |
2035 | } | |
2036 | g_free(buf); | |
2037 | buf = qemu_opt_get_del(opts, BLOCK_OPT_COMPAT_LEVEL); | |
2038 | if (!buf) { | |
2039 | /* keep the default */ | |
2040 | } else if (!strcmp(buf, "0.10")) { | |
2041 | version = 2; | |
2042 | } else if (!strcmp(buf, "1.1")) { | |
2043 | version = 3; | |
2044 | } else { | |
2045 | error_setg(errp, "Invalid compatibility level: '%s'", buf); | |
2046 | ret = -EINVAL; | |
2047 | goto finish; | |
2048 | } | |
2049 | ||
2050 | if (qemu_opt_get_bool_del(opts, BLOCK_OPT_LAZY_REFCOUNTS, false)) { | |
2051 | flags |= BLOCK_FLAG_LAZY_REFCOUNTS; | |
de5f3f40 KW |
2052 | } |
2053 | ||
ffeaac9b | 2054 | if (backing_file && prealloc != PREALLOC_MODE_OFF) { |
3ef6c40a HR |
2055 | error_setg(errp, "Backing file and preallocation cannot be used at " |
2056 | "the same time"); | |
1bd0e2d1 CL |
2057 | ret = -EINVAL; |
2058 | goto finish; | |
de5f3f40 KW |
2059 | } |
2060 | ||
bfe8043e | 2061 | if (version < 3 && (flags & BLOCK_FLAG_LAZY_REFCOUNTS)) { |
3ef6c40a HR |
2062 | error_setg(errp, "Lazy refcounts only supported with compatibility " |
2063 | "level 1.1 and above (use compat=1.1 or greater)"); | |
1bd0e2d1 CL |
2064 | ret = -EINVAL; |
2065 | goto finish; | |
bfe8043e SH |
2066 | } |
2067 | ||
180e9526 | 2068 | ret = qcow2_create2(filename, size, backing_file, backing_fmt, flags, |
1bd0e2d1 | 2069 | cluster_size, prealloc, opts, version, &local_err); |
84d18f06 | 2070 | if (local_err) { |
3ef6c40a HR |
2071 | error_propagate(errp, local_err); |
2072 | } | |
1bd0e2d1 CL |
2073 | |
2074 | finish: | |
2075 | g_free(backing_file); | |
2076 | g_free(backing_fmt); | |
2077 | g_free(buf); | |
3ef6c40a | 2078 | return ret; |
de5f3f40 KW |
2079 | } |
2080 | ||
621f0589 | 2081 | static coroutine_fn int qcow2_co_write_zeroes(BlockDriverState *bs, |
aa7bfbff | 2082 | int64_t sector_num, int nb_sectors, BdrvRequestFlags flags) |
621f0589 KW |
2083 | { |
2084 | int ret; | |
2085 | BDRVQcowState *s = bs->opaque; | |
2086 | ||
2087 | /* Emulate misaligned zero writes */ | |
2088 | if (sector_num % s->cluster_sectors || nb_sectors % s->cluster_sectors) { | |
2089 | return -ENOTSUP; | |
2090 | } | |
2091 | ||
2092 | /* Whatever is left can use real zero clusters */ | |
2093 | qemu_co_mutex_lock(&s->lock); | |
2094 | ret = qcow2_zero_clusters(bs, sector_num << BDRV_SECTOR_BITS, | |
2095 | nb_sectors); | |
2096 | qemu_co_mutex_unlock(&s->lock); | |
2097 | ||
2098 | return ret; | |
2099 | } | |
2100 | ||
6db39ae2 PB |
2101 | static coroutine_fn int qcow2_co_discard(BlockDriverState *bs, |
2102 | int64_t sector_num, int nb_sectors) | |
5ea929e3 | 2103 | { |
6db39ae2 PB |
2104 | int ret; |
2105 | BDRVQcowState *s = bs->opaque; | |
2106 | ||
2107 | qemu_co_mutex_lock(&s->lock); | |
2108 | ret = qcow2_discard_clusters(bs, sector_num << BDRV_SECTOR_BITS, | |
808c4b6f | 2109 | nb_sectors, QCOW2_DISCARD_REQUEST, false); |
6db39ae2 PB |
2110 | qemu_co_mutex_unlock(&s->lock); |
2111 | return ret; | |
5ea929e3 KW |
2112 | } |
2113 | ||
419b19d9 SH |
2114 | static int qcow2_truncate(BlockDriverState *bs, int64_t offset) |
2115 | { | |
2116 | BDRVQcowState *s = bs->opaque; | |
2cf7cfa1 KW |
2117 | int64_t new_l1_size; |
2118 | int ret; | |
419b19d9 SH |
2119 | |
2120 | if (offset & 511) { | |
259b2173 | 2121 | error_report("The new size must be a multiple of 512"); |
419b19d9 SH |
2122 | return -EINVAL; |
2123 | } | |
2124 | ||
2125 | /* cannot proceed if image has snapshots */ | |
2126 | if (s->nb_snapshots) { | |
259b2173 | 2127 | error_report("Can't resize an image which has snapshots"); |
419b19d9 SH |
2128 | return -ENOTSUP; |
2129 | } | |
2130 | ||
2131 | /* shrinking is currently not supported */ | |
2132 | if (offset < bs->total_sectors * 512) { | |
259b2173 | 2133 | error_report("qcow2 doesn't support shrinking images yet"); |
419b19d9 SH |
2134 | return -ENOTSUP; |
2135 | } | |
2136 | ||
2137 | new_l1_size = size_to_l1(s, offset); | |
72893756 | 2138 | ret = qcow2_grow_l1_table(bs, new_l1_size, true); |
419b19d9 SH |
2139 | if (ret < 0) { |
2140 | return ret; | |
2141 | } | |
2142 | ||
2143 | /* write updated header.size */ | |
2144 | offset = cpu_to_be64(offset); | |
8b3b7206 KW |
2145 | ret = bdrv_pwrite_sync(bs->file, offsetof(QCowHeader, size), |
2146 | &offset, sizeof(uint64_t)); | |
419b19d9 SH |
2147 | if (ret < 0) { |
2148 | return ret; | |
2149 | } | |
2150 | ||
2151 | s->l1_vm_state_index = new_l1_size; | |
2152 | return 0; | |
2153 | } | |
2154 | ||
20d97356 BS |
2155 | /* XXX: put compressed sectors first, then all the cluster aligned |
2156 | tables to avoid losing bytes in alignment */ | |
7c80ab3f JS |
2157 | static int qcow2_write_compressed(BlockDriverState *bs, int64_t sector_num, |
2158 | const uint8_t *buf, int nb_sectors) | |
20d97356 BS |
2159 | { |
2160 | BDRVQcowState *s = bs->opaque; | |
2161 | z_stream strm; | |
2162 | int ret, out_len; | |
2163 | uint8_t *out_buf; | |
2164 | uint64_t cluster_offset; | |
2165 | ||
2166 | if (nb_sectors == 0) { | |
2167 | /* align end of file to a sector boundary to ease reading with | |
2168 | sector based I/Os */ | |
66f82cee | 2169 | cluster_offset = bdrv_getlength(bs->file); |
6a69b962 | 2170 | return bdrv_truncate(bs->file, cluster_offset); |
20d97356 BS |
2171 | } |
2172 | ||
f4d38bef SH |
2173 | if (nb_sectors != s->cluster_sectors) { |
2174 | ret = -EINVAL; | |
2175 | ||
2176 | /* Zero-pad last write if image size is not cluster aligned */ | |
2177 | if (sector_num + nb_sectors == bs->total_sectors && | |
2178 | nb_sectors < s->cluster_sectors) { | |
2179 | uint8_t *pad_buf = qemu_blockalign(bs, s->cluster_size); | |
2180 | memset(pad_buf, 0, s->cluster_size); | |
2181 | memcpy(pad_buf, buf, nb_sectors * BDRV_SECTOR_SIZE); | |
2182 | ret = qcow2_write_compressed(bs, sector_num, | |
2183 | pad_buf, s->cluster_sectors); | |
2184 | qemu_vfree(pad_buf); | |
2185 | } | |
2186 | return ret; | |
2187 | } | |
20d97356 | 2188 | |
7267c094 | 2189 | out_buf = g_malloc(s->cluster_size + (s->cluster_size / 1000) + 128); |
20d97356 BS |
2190 | |
2191 | /* best compression, small window, no zlib header */ | |
2192 | memset(&strm, 0, sizeof(strm)); | |
2193 | ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION, | |
2194 | Z_DEFLATED, -12, | |
2195 | 9, Z_DEFAULT_STRATEGY); | |
2196 | if (ret != 0) { | |
8f1efd00 KW |
2197 | ret = -EINVAL; |
2198 | goto fail; | |
20d97356 BS |
2199 | } |
2200 | ||
2201 | strm.avail_in = s->cluster_size; | |
2202 | strm.next_in = (uint8_t *)buf; | |
2203 | strm.avail_out = s->cluster_size; | |
2204 | strm.next_out = out_buf; | |
2205 | ||
2206 | ret = deflate(&strm, Z_FINISH); | |
2207 | if (ret != Z_STREAM_END && ret != Z_OK) { | |
20d97356 | 2208 | deflateEnd(&strm); |
8f1efd00 KW |
2209 | ret = -EINVAL; |
2210 | goto fail; | |
20d97356 BS |
2211 | } |
2212 | out_len = strm.next_out - out_buf; | |
2213 | ||
2214 | deflateEnd(&strm); | |
2215 | ||
2216 | if (ret != Z_STREAM_END || out_len >= s->cluster_size) { | |
2217 | /* could not compress: write normal cluster */ | |
8f1efd00 KW |
2218 | ret = bdrv_write(bs, sector_num, buf, s->cluster_sectors); |
2219 | if (ret < 0) { | |
2220 | goto fail; | |
2221 | } | |
20d97356 BS |
2222 | } else { |
2223 | cluster_offset = qcow2_alloc_compressed_cluster_offset(bs, | |
2224 | sector_num << 9, out_len); | |
8f1efd00 KW |
2225 | if (!cluster_offset) { |
2226 | ret = -EIO; | |
2227 | goto fail; | |
2228 | } | |
20d97356 | 2229 | cluster_offset &= s->cluster_offset_mask; |
cf93980e | 2230 | |
231bb267 | 2231 | ret = qcow2_pre_write_overlap_check(bs, 0, cluster_offset, out_len); |
cf93980e HR |
2232 | if (ret < 0) { |
2233 | goto fail; | |
2234 | } | |
2235 | ||
66f82cee | 2236 | BLKDBG_EVENT(bs->file, BLKDBG_WRITE_COMPRESSED); |
8f1efd00 KW |
2237 | ret = bdrv_pwrite(bs->file, cluster_offset, out_buf, out_len); |
2238 | if (ret < 0) { | |
2239 | goto fail; | |
20d97356 BS |
2240 | } |
2241 | } | |
2242 | ||
8f1efd00 KW |
2243 | ret = 0; |
2244 | fail: | |
7267c094 | 2245 | g_free(out_buf); |
8f1efd00 | 2246 | return ret; |
20d97356 BS |
2247 | } |
2248 | ||
94054183 HR |
2249 | static int make_completely_empty(BlockDriverState *bs) |
2250 | { | |
2251 | BDRVQcowState *s = bs->opaque; | |
2252 | int ret, l1_clusters; | |
2253 | int64_t offset; | |
2254 | uint64_t *new_reftable = NULL; | |
2255 | uint64_t rt_entry, l1_size2; | |
2256 | struct { | |
2257 | uint64_t l1_offset; | |
2258 | uint64_t reftable_offset; | |
2259 | uint32_t reftable_clusters; | |
2260 | } QEMU_PACKED l1_ofs_rt_ofs_cls; | |
2261 | ||
2262 | ret = qcow2_cache_empty(bs, s->l2_table_cache); | |
2263 | if (ret < 0) { | |
2264 | goto fail; | |
2265 | } | |
2266 | ||
2267 | ret = qcow2_cache_empty(bs, s->refcount_block_cache); | |
2268 | if (ret < 0) { | |
2269 | goto fail; | |
2270 | } | |
2271 | ||
2272 | /* Refcounts will be broken utterly */ | |
2273 | ret = qcow2_mark_dirty(bs); | |
2274 | if (ret < 0) { | |
2275 | goto fail; | |
2276 | } | |
2277 | ||
2278 | BLKDBG_EVENT(bs->file, BLKDBG_L1_UPDATE); | |
2279 | ||
2280 | l1_clusters = DIV_ROUND_UP(s->l1_size, s->cluster_size / sizeof(uint64_t)); | |
2281 | l1_size2 = (uint64_t)s->l1_size * sizeof(uint64_t); | |
2282 | ||
2283 | /* After this call, neither the in-memory nor the on-disk refcount | |
2284 | * information accurately describe the actual references */ | |
2285 | ||
2286 | ret = bdrv_write_zeroes(bs->file, s->l1_table_offset / BDRV_SECTOR_SIZE, | |
2287 | l1_clusters * s->cluster_sectors, 0); | |
2288 | if (ret < 0) { | |
2289 | goto fail_broken_refcounts; | |
2290 | } | |
2291 | memset(s->l1_table, 0, l1_size2); | |
2292 | ||
2293 | BLKDBG_EVENT(bs->file, BLKDBG_EMPTY_IMAGE_PREPARE); | |
2294 | ||
2295 | /* Overwrite enough clusters at the beginning of the sectors to place | |
2296 | * the refcount table, a refcount block and the L1 table in; this may | |
2297 | * overwrite parts of the existing refcount and L1 table, which is not | |
2298 | * an issue because the dirty flag is set, complete data loss is in fact | |
2299 | * desired and partial data loss is consequently fine as well */ | |
2300 | ret = bdrv_write_zeroes(bs->file, s->cluster_size / BDRV_SECTOR_SIZE, | |
2301 | (2 + l1_clusters) * s->cluster_size / | |
2302 | BDRV_SECTOR_SIZE, 0); | |
2303 | /* This call (even if it failed overall) may have overwritten on-disk | |
2304 | * refcount structures; in that case, the in-memory refcount information | |
2305 | * will probably differ from the on-disk information which makes the BDS | |
2306 | * unusable */ | |
2307 | if (ret < 0) { | |
2308 | goto fail_broken_refcounts; | |
2309 | } | |
2310 | ||
2311 | BLKDBG_EVENT(bs->file, BLKDBG_L1_UPDATE); | |
2312 | BLKDBG_EVENT(bs->file, BLKDBG_REFTABLE_UPDATE); | |
2313 | ||
2314 | /* "Create" an empty reftable (one cluster) directly after the image | |
2315 | * header and an empty L1 table three clusters after the image header; | |
2316 | * the cluster between those two will be used as the first refblock */ | |
2317 | cpu_to_be64w(&l1_ofs_rt_ofs_cls.l1_offset, 3 * s->cluster_size); | |
2318 | cpu_to_be64w(&l1_ofs_rt_ofs_cls.reftable_offset, s->cluster_size); | |
2319 | cpu_to_be32w(&l1_ofs_rt_ofs_cls.reftable_clusters, 1); | |
2320 | ret = bdrv_pwrite_sync(bs->file, offsetof(QCowHeader, l1_table_offset), | |
2321 | &l1_ofs_rt_ofs_cls, sizeof(l1_ofs_rt_ofs_cls)); | |
2322 | if (ret < 0) { | |
2323 | goto fail_broken_refcounts; | |
2324 | } | |
2325 | ||
2326 | s->l1_table_offset = 3 * s->cluster_size; | |
2327 | ||
2328 | new_reftable = g_try_new0(uint64_t, s->cluster_size / sizeof(uint64_t)); | |
2329 | if (!new_reftable) { | |
2330 | ret = -ENOMEM; | |
2331 | goto fail_broken_refcounts; | |
2332 | } | |
2333 | ||
2334 | s->refcount_table_offset = s->cluster_size; | |
2335 | s->refcount_table_size = s->cluster_size / sizeof(uint64_t); | |
2336 | ||
2337 | g_free(s->refcount_table); | |
2338 | s->refcount_table = new_reftable; | |
2339 | new_reftable = NULL; | |
2340 | ||
2341 | /* Now the in-memory refcount information again corresponds to the on-disk | |
2342 | * information (reftable is empty and no refblocks (the refblock cache is | |
2343 | * empty)); however, this means some clusters (e.g. the image header) are | |
2344 | * referenced, but not refcounted, but the normal qcow2 code assumes that | |
2345 | * the in-memory information is always correct */ | |
2346 | ||
2347 | BLKDBG_EVENT(bs->file, BLKDBG_REFBLOCK_ALLOC); | |
2348 | ||
2349 | /* Enter the first refblock into the reftable */ | |
2350 | rt_entry = cpu_to_be64(2 * s->cluster_size); | |
2351 | ret = bdrv_pwrite_sync(bs->file, s->cluster_size, | |
2352 | &rt_entry, sizeof(rt_entry)); | |
2353 | if (ret < 0) { | |
2354 | goto fail_broken_refcounts; | |
2355 | } | |
2356 | s->refcount_table[0] = 2 * s->cluster_size; | |
2357 | ||
2358 | s->free_cluster_index = 0; | |
2359 | assert(3 + l1_clusters <= s->refcount_block_size); | |
2360 | offset = qcow2_alloc_clusters(bs, 3 * s->cluster_size + l1_size2); | |
2361 | if (offset < 0) { | |
2362 | ret = offset; | |
2363 | goto fail_broken_refcounts; | |
2364 | } else if (offset > 0) { | |
2365 | error_report("First cluster in emptied image is in use"); | |
2366 | abort(); | |
2367 | } | |
2368 | ||
2369 | /* Now finally the in-memory information corresponds to the on-disk | |
2370 | * structures and is correct */ | |
2371 | ret = qcow2_mark_clean(bs); | |
2372 | if (ret < 0) { | |
2373 | goto fail; | |
2374 | } | |
2375 | ||
2376 | ret = bdrv_truncate(bs->file, (3 + l1_clusters) * s->cluster_size); | |
2377 | if (ret < 0) { | |
2378 | goto fail; | |
2379 | } | |
2380 | ||
2381 | return 0; | |
2382 | ||
2383 | fail_broken_refcounts: | |
2384 | /* The BDS is unusable at this point. If we wanted to make it usable, we | |
2385 | * would have to call qcow2_refcount_close(), qcow2_refcount_init(), | |
2386 | * qcow2_check_refcounts(), qcow2_refcount_close() and qcow2_refcount_init() | |
2387 | * again. However, because the functions which could have caused this error | |
2388 | * path to be taken are used by those functions as well, it's very likely | |
2389 | * that that sequence will fail as well. Therefore, just eject the BDS. */ | |
2390 | bs->drv = NULL; | |
2391 | ||
2392 | fail: | |
2393 | g_free(new_reftable); | |
2394 | return ret; | |
2395 | } | |
2396 | ||
491d27e2 HR |
2397 | static int qcow2_make_empty(BlockDriverState *bs) |
2398 | { | |
94054183 | 2399 | BDRVQcowState *s = bs->opaque; |
491d27e2 HR |
2400 | uint64_t start_sector; |
2401 | int sector_step = INT_MAX / BDRV_SECTOR_SIZE; | |
94054183 HR |
2402 | int l1_clusters, ret = 0; |
2403 | ||
2404 | l1_clusters = DIV_ROUND_UP(s->l1_size, s->cluster_size / sizeof(uint64_t)); | |
2405 | ||
2406 | if (s->qcow_version >= 3 && !s->snapshots && | |
2407 | 3 + l1_clusters <= s->refcount_block_size) { | |
2408 | /* The following function only works for qcow2 v3 images (it requires | |
2409 | * the dirty flag) and only as long as there are no snapshots (because | |
2410 | * it completely empties the image). Furthermore, the L1 table and three | |
2411 | * additional clusters (image header, refcount table, one refcount | |
2412 | * block) have to fit inside one refcount block. */ | |
2413 | return make_completely_empty(bs); | |
2414 | } | |
491d27e2 | 2415 | |
94054183 HR |
2416 | /* This fallback code simply discards every active cluster; this is slow, |
2417 | * but works in all cases */ | |
491d27e2 HR |
2418 | for (start_sector = 0; start_sector < bs->total_sectors; |
2419 | start_sector += sector_step) | |
2420 | { | |
2421 | /* As this function is generally used after committing an external | |
2422 | * snapshot, QCOW2_DISCARD_SNAPSHOT seems appropriate. Also, the | |
2423 | * default action for this kind of discard is to pass the discard, | |
2424 | * which will ideally result in an actually smaller image file, as | |
2425 | * is probably desired. */ | |
2426 | ret = qcow2_discard_clusters(bs, start_sector * BDRV_SECTOR_SIZE, | |
2427 | MIN(sector_step, | |
2428 | bs->total_sectors - start_sector), | |
2429 | QCOW2_DISCARD_SNAPSHOT, true); | |
2430 | if (ret < 0) { | |
2431 | break; | |
2432 | } | |
2433 | } | |
2434 | ||
2435 | return ret; | |
2436 | } | |
2437 | ||
a968168c | 2438 | static coroutine_fn int qcow2_co_flush_to_os(BlockDriverState *bs) |
20d97356 | 2439 | { |
29c1a730 KW |
2440 | BDRVQcowState *s = bs->opaque; |
2441 | int ret; | |
2442 | ||
8b94ff85 | 2443 | qemu_co_mutex_lock(&s->lock); |
29c1a730 KW |
2444 | ret = qcow2_cache_flush(bs, s->l2_table_cache); |
2445 | if (ret < 0) { | |
c95de7e2 | 2446 | qemu_co_mutex_unlock(&s->lock); |
8b94ff85 | 2447 | return ret; |
29c1a730 KW |
2448 | } |
2449 | ||
bfe8043e SH |
2450 | if (qcow2_need_accurate_refcounts(s)) { |
2451 | ret = qcow2_cache_flush(bs, s->refcount_block_cache); | |
2452 | if (ret < 0) { | |
2453 | qemu_co_mutex_unlock(&s->lock); | |
2454 | return ret; | |
2455 | } | |
29c1a730 | 2456 | } |
8b94ff85 | 2457 | qemu_co_mutex_unlock(&s->lock); |
29c1a730 | 2458 | |
eb489bb1 KW |
2459 | return 0; |
2460 | } | |
2461 | ||
7c80ab3f | 2462 | static int qcow2_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
20d97356 BS |
2463 | { |
2464 | BDRVQcowState *s = bs->opaque; | |
95de6d70 PB |
2465 | bdi->unallocated_blocks_are_zero = true; |
2466 | bdi->can_write_zeroes_with_unmap = (s->qcow_version >= 3); | |
20d97356 | 2467 | bdi->cluster_size = s->cluster_size; |
7c80ab3f | 2468 | bdi->vm_state_offset = qcow2_vm_state_offset(s); |
20d97356 BS |
2469 | return 0; |
2470 | } | |
2471 | ||
37764dfb HR |
2472 | static ImageInfoSpecific *qcow2_get_specific_info(BlockDriverState *bs) |
2473 | { | |
2474 | BDRVQcowState *s = bs->opaque; | |
2475 | ImageInfoSpecific *spec_info = g_new(ImageInfoSpecific, 1); | |
2476 | ||
2477 | *spec_info = (ImageInfoSpecific){ | |
2478 | .kind = IMAGE_INFO_SPECIFIC_KIND_QCOW2, | |
2479 | { | |
2480 | .qcow2 = g_new(ImageInfoSpecificQCow2, 1), | |
2481 | }, | |
2482 | }; | |
2483 | if (s->qcow_version == 2) { | |
2484 | *spec_info->qcow2 = (ImageInfoSpecificQCow2){ | |
0709c5a1 HR |
2485 | .compat = g_strdup("0.10"), |
2486 | .refcount_bits = s->refcount_bits, | |
37764dfb HR |
2487 | }; |
2488 | } else if (s->qcow_version == 3) { | |
2489 | *spec_info->qcow2 = (ImageInfoSpecificQCow2){ | |
2490 | .compat = g_strdup("1.1"), | |
2491 | .lazy_refcounts = s->compatible_features & | |
2492 | QCOW2_COMPAT_LAZY_REFCOUNTS, | |
2493 | .has_lazy_refcounts = true, | |
9009b196 HR |
2494 | .corrupt = s->incompatible_features & |
2495 | QCOW2_INCOMPAT_CORRUPT, | |
2496 | .has_corrupt = true, | |
0709c5a1 | 2497 | .refcount_bits = s->refcount_bits, |
37764dfb HR |
2498 | }; |
2499 | } | |
2500 | ||
2501 | return spec_info; | |
2502 | } | |
2503 | ||
20d97356 BS |
2504 | #if 0 |
2505 | static void dump_refcounts(BlockDriverState *bs) | |
2506 | { | |
2507 | BDRVQcowState *s = bs->opaque; | |
2508 | int64_t nb_clusters, k, k1, size; | |
2509 | int refcount; | |
2510 | ||
66f82cee | 2511 | size = bdrv_getlength(bs->file); |
20d97356 BS |
2512 | nb_clusters = size_to_clusters(s, size); |
2513 | for(k = 0; k < nb_clusters;) { | |
2514 | k1 = k; | |
2515 | refcount = get_refcount(bs, k); | |
2516 | k++; | |
2517 | while (k < nb_clusters && get_refcount(bs, k) == refcount) | |
2518 | k++; | |
0bfcd599 BS |
2519 | printf("%" PRId64 ": refcount=%d nb=%" PRId64 "\n", k, refcount, |
2520 | k - k1); | |
20d97356 BS |
2521 | } |
2522 | } | |
2523 | #endif | |
2524 | ||
cf8074b3 KW |
2525 | static int qcow2_save_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, |
2526 | int64_t pos) | |
20d97356 BS |
2527 | { |
2528 | BDRVQcowState *s = bs->opaque; | |
eedff66f | 2529 | int64_t total_sectors = bs->total_sectors; |
6e13610a | 2530 | bool zero_beyond_eof = bs->zero_beyond_eof; |
20d97356 BS |
2531 | int ret; |
2532 | ||
66f82cee | 2533 | BLKDBG_EVENT(bs->file, BLKDBG_VMSTATE_SAVE); |
6e13610a | 2534 | bs->zero_beyond_eof = false; |
8d3b1a2d | 2535 | ret = bdrv_pwritev(bs, qcow2_vm_state_offset(s) + pos, qiov); |
6e13610a | 2536 | bs->zero_beyond_eof = zero_beyond_eof; |
20d97356 | 2537 | |
eedff66f HR |
2538 | /* bdrv_co_do_writev will have increased the total_sectors value to include |
2539 | * the VM state - the VM state is however not an actual part of the block | |
2540 | * device, therefore, we need to restore the old value. */ | |
2541 | bs->total_sectors = total_sectors; | |
2542 | ||
20d97356 BS |
2543 | return ret; |
2544 | } | |
2545 | ||
7c80ab3f JS |
2546 | static int qcow2_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
2547 | int64_t pos, int size) | |
20d97356 BS |
2548 | { |
2549 | BDRVQcowState *s = bs->opaque; | |
0d51b4de | 2550 | bool zero_beyond_eof = bs->zero_beyond_eof; |
20d97356 BS |
2551 | int ret; |
2552 | ||
66f82cee | 2553 | BLKDBG_EVENT(bs->file, BLKDBG_VMSTATE_LOAD); |
0d51b4de | 2554 | bs->zero_beyond_eof = false; |
7c80ab3f | 2555 | ret = bdrv_pread(bs, qcow2_vm_state_offset(s) + pos, buf, size); |
0d51b4de | 2556 | bs->zero_beyond_eof = zero_beyond_eof; |
20d97356 BS |
2557 | |
2558 | return ret; | |
2559 | } | |
2560 | ||
9296b3ed HR |
2561 | /* |
2562 | * Downgrades an image's version. To achieve this, any incompatible features | |
2563 | * have to be removed. | |
2564 | */ | |
4057a2b2 HR |
2565 | static int qcow2_downgrade(BlockDriverState *bs, int target_version, |
2566 | BlockDriverAmendStatusCB *status_cb) | |
9296b3ed HR |
2567 | { |
2568 | BDRVQcowState *s = bs->opaque; | |
2569 | int current_version = s->qcow_version; | |
2570 | int ret; | |
2571 | ||
2572 | if (target_version == current_version) { | |
2573 | return 0; | |
2574 | } else if (target_version > current_version) { | |
2575 | return -EINVAL; | |
2576 | } else if (target_version != 2) { | |
2577 | return -EINVAL; | |
2578 | } | |
2579 | ||
2580 | if (s->refcount_order != 4) { | |
2581 | /* we would have to convert the image to a refcount_order == 4 image | |
2582 | * here; however, since qemu (at the time of writing this) does not | |
2583 | * support anything different than 4 anyway, there is no point in doing | |
2584 | * so right now; however, we should error out (if qemu supports this in | |
2585 | * the future and this code has not been adapted) */ | |
9e3f0892 | 2586 | error_report("qcow2_downgrade: Image refcount orders other than 4 are " |
9296b3ed HR |
2587 | "currently not supported."); |
2588 | return -ENOTSUP; | |
2589 | } | |
2590 | ||
2591 | /* clear incompatible features */ | |
2592 | if (s->incompatible_features & QCOW2_INCOMPAT_DIRTY) { | |
2593 | ret = qcow2_mark_clean(bs); | |
2594 | if (ret < 0) { | |
2595 | return ret; | |
2596 | } | |
2597 | } | |
2598 | ||
2599 | /* with QCOW2_INCOMPAT_CORRUPT, it is pretty much impossible to get here in | |
2600 | * the first place; if that happens nonetheless, returning -ENOTSUP is the | |
2601 | * best thing to do anyway */ | |
2602 | ||
2603 | if (s->incompatible_features) { | |
2604 | return -ENOTSUP; | |
2605 | } | |
2606 | ||
2607 | /* since we can ignore compatible features, we can set them to 0 as well */ | |
2608 | s->compatible_features = 0; | |
2609 | /* if lazy refcounts have been used, they have already been fixed through | |
2610 | * clearing the dirty flag */ | |
2611 | ||
2612 | /* clearing autoclear features is trivial */ | |
2613 | s->autoclear_features = 0; | |
2614 | ||
4057a2b2 | 2615 | ret = qcow2_expand_zero_clusters(bs, status_cb); |
9296b3ed HR |
2616 | if (ret < 0) { |
2617 | return ret; | |
2618 | } | |
2619 | ||
2620 | s->qcow_version = target_version; | |
2621 | ret = qcow2_update_header(bs); | |
2622 | if (ret < 0) { | |
2623 | s->qcow_version = current_version; | |
2624 | return ret; | |
2625 | } | |
2626 | return 0; | |
2627 | } | |
2628 | ||
77485434 HR |
2629 | static int qcow2_amend_options(BlockDriverState *bs, QemuOpts *opts, |
2630 | BlockDriverAmendStatusCB *status_cb) | |
9296b3ed HR |
2631 | { |
2632 | BDRVQcowState *s = bs->opaque; | |
2633 | int old_version = s->qcow_version, new_version = old_version; | |
2634 | uint64_t new_size = 0; | |
2635 | const char *backing_file = NULL, *backing_format = NULL; | |
2636 | bool lazy_refcounts = s->use_lazy_refcounts; | |
1bd0e2d1 CL |
2637 | const char *compat = NULL; |
2638 | uint64_t cluster_size = s->cluster_size; | |
2639 | bool encrypt; | |
9296b3ed | 2640 | int ret; |
1bd0e2d1 | 2641 | QemuOptDesc *desc = opts->list->desc; |
9296b3ed | 2642 | |
1bd0e2d1 CL |
2643 | while (desc && desc->name) { |
2644 | if (!qemu_opt_find(opts, desc->name)) { | |
9296b3ed | 2645 | /* only change explicitly defined options */ |
1bd0e2d1 | 2646 | desc++; |
9296b3ed HR |
2647 | continue; |
2648 | } | |
2649 | ||
1bd0e2d1 CL |
2650 | if (!strcmp(desc->name, "compat")) { |
2651 | compat = qemu_opt_get(opts, "compat"); | |
2652 | if (!compat) { | |
9296b3ed | 2653 | /* preserve default */ |
1bd0e2d1 | 2654 | } else if (!strcmp(compat, "0.10")) { |
9296b3ed | 2655 | new_version = 2; |
1bd0e2d1 | 2656 | } else if (!strcmp(compat, "1.1")) { |
9296b3ed HR |
2657 | new_version = 3; |
2658 | } else { | |
1bd0e2d1 | 2659 | fprintf(stderr, "Unknown compatibility level %s.\n", compat); |
9296b3ed HR |
2660 | return -EINVAL; |
2661 | } | |
1bd0e2d1 | 2662 | } else if (!strcmp(desc->name, "preallocation")) { |
9296b3ed HR |
2663 | fprintf(stderr, "Cannot change preallocation mode.\n"); |
2664 | return -ENOTSUP; | |
1bd0e2d1 CL |
2665 | } else if (!strcmp(desc->name, "size")) { |
2666 | new_size = qemu_opt_get_size(opts, "size", 0); | |
2667 | } else if (!strcmp(desc->name, "backing_file")) { | |
2668 | backing_file = qemu_opt_get(opts, "backing_file"); | |
2669 | } else if (!strcmp(desc->name, "backing_fmt")) { | |
2670 | backing_format = qemu_opt_get(opts, "backing_fmt"); | |
2671 | } else if (!strcmp(desc->name, "encryption")) { | |
2672 | encrypt = qemu_opt_get_bool(opts, "encryption", s->crypt_method); | |
2673 | if (encrypt != !!s->crypt_method) { | |
9296b3ed HR |
2674 | fprintf(stderr, "Changing the encryption flag is not " |
2675 | "supported.\n"); | |
2676 | return -ENOTSUP; | |
2677 | } | |
1bd0e2d1 CL |
2678 | } else if (!strcmp(desc->name, "cluster_size")) { |
2679 | cluster_size = qemu_opt_get_size(opts, "cluster_size", | |
2680 | cluster_size); | |
2681 | if (cluster_size != s->cluster_size) { | |
9296b3ed HR |
2682 | fprintf(stderr, "Changing the cluster size is not " |
2683 | "supported.\n"); | |
2684 | return -ENOTSUP; | |
2685 | } | |
1bd0e2d1 CL |
2686 | } else if (!strcmp(desc->name, "lazy_refcounts")) { |
2687 | lazy_refcounts = qemu_opt_get_bool(opts, "lazy_refcounts", | |
2688 | lazy_refcounts); | |
9296b3ed HR |
2689 | } else { |
2690 | /* if this assertion fails, this probably means a new option was | |
2691 | * added without having it covered here */ | |
2692 | assert(false); | |
2693 | } | |
1bd0e2d1 CL |
2694 | |
2695 | desc++; | |
9296b3ed HR |
2696 | } |
2697 | ||
2698 | if (new_version != old_version) { | |
2699 | if (new_version > old_version) { | |
2700 | /* Upgrade */ | |
2701 | s->qcow_version = new_version; | |
2702 | ret = qcow2_update_header(bs); | |
2703 | if (ret < 0) { | |
2704 | s->qcow_version = old_version; | |
2705 | return ret; | |
2706 | } | |
2707 | } else { | |
4057a2b2 | 2708 | ret = qcow2_downgrade(bs, new_version, status_cb); |
9296b3ed HR |
2709 | if (ret < 0) { |
2710 | return ret; | |
2711 | } | |
2712 | } | |
2713 | } | |
2714 | ||
2715 | if (backing_file || backing_format) { | |
2716 | ret = qcow2_change_backing_file(bs, backing_file ?: bs->backing_file, | |
2717 | backing_format ?: bs->backing_format); | |
2718 | if (ret < 0) { | |
2719 | return ret; | |
2720 | } | |
2721 | } | |
2722 | ||
2723 | if (s->use_lazy_refcounts != lazy_refcounts) { | |
2724 | if (lazy_refcounts) { | |
2725 | if (s->qcow_version < 3) { | |
2726 | fprintf(stderr, "Lazy refcounts only supported with compatibility " | |
2727 | "level 1.1 and above (use compat=1.1 or greater)\n"); | |
2728 | return -EINVAL; | |
2729 | } | |
2730 | s->compatible_features |= QCOW2_COMPAT_LAZY_REFCOUNTS; | |
2731 | ret = qcow2_update_header(bs); | |
2732 | if (ret < 0) { | |
2733 | s->compatible_features &= ~QCOW2_COMPAT_LAZY_REFCOUNTS; | |
2734 | return ret; | |
2735 | } | |
2736 | s->use_lazy_refcounts = true; | |
2737 | } else { | |
2738 | /* make image clean first */ | |
2739 | ret = qcow2_mark_clean(bs); | |
2740 | if (ret < 0) { | |
2741 | return ret; | |
2742 | } | |
2743 | /* now disallow lazy refcounts */ | |
2744 | s->compatible_features &= ~QCOW2_COMPAT_LAZY_REFCOUNTS; | |
2745 | ret = qcow2_update_header(bs); | |
2746 | if (ret < 0) { | |
2747 | s->compatible_features |= QCOW2_COMPAT_LAZY_REFCOUNTS; | |
2748 | return ret; | |
2749 | } | |
2750 | s->use_lazy_refcounts = false; | |
2751 | } | |
2752 | } | |
2753 | ||
2754 | if (new_size) { | |
2755 | ret = bdrv_truncate(bs, new_size); | |
2756 | if (ret < 0) { | |
2757 | return ret; | |
2758 | } | |
2759 | } | |
2760 | ||
2761 | return 0; | |
2762 | } | |
2763 | ||
85186ebd HR |
2764 | /* |
2765 | * If offset or size are negative, respectively, they will not be included in | |
2766 | * the BLOCK_IMAGE_CORRUPTED event emitted. | |
2767 | * fatal will be ignored for read-only BDS; corruptions found there will always | |
2768 | * be considered non-fatal. | |
2769 | */ | |
2770 | void qcow2_signal_corruption(BlockDriverState *bs, bool fatal, int64_t offset, | |
2771 | int64_t size, const char *message_format, ...) | |
2772 | { | |
2773 | BDRVQcowState *s = bs->opaque; | |
2774 | char *message; | |
2775 | va_list ap; | |
2776 | ||
2777 | fatal = fatal && !bs->read_only; | |
2778 | ||
2779 | if (s->signaled_corruption && | |
2780 | (!fatal || (s->incompatible_features & QCOW2_INCOMPAT_CORRUPT))) | |
2781 | { | |
2782 | return; | |
2783 | } | |
2784 | ||
2785 | va_start(ap, message_format); | |
2786 | message = g_strdup_vprintf(message_format, ap); | |
2787 | va_end(ap); | |
2788 | ||
2789 | if (fatal) { | |
2790 | fprintf(stderr, "qcow2: Marking image as corrupt: %s; further " | |
2791 | "corruption events will be suppressed\n", message); | |
2792 | } else { | |
2793 | fprintf(stderr, "qcow2: Image is corrupt: %s; further non-fatal " | |
2794 | "corruption events will be suppressed\n", message); | |
2795 | } | |
2796 | ||
2797 | qapi_event_send_block_image_corrupted(bdrv_get_device_name(bs), message, | |
2798 | offset >= 0, offset, size >= 0, size, | |
2799 | fatal, &error_abort); | |
2800 | g_free(message); | |
2801 | ||
2802 | if (fatal) { | |
2803 | qcow2_mark_corrupt(bs); | |
2804 | bs->drv = NULL; /* make BDS unusable */ | |
2805 | } | |
2806 | ||
2807 | s->signaled_corruption = true; | |
2808 | } | |
2809 | ||
1bd0e2d1 CL |
2810 | static QemuOptsList qcow2_create_opts = { |
2811 | .name = "qcow2-create-opts", | |
2812 | .head = QTAILQ_HEAD_INITIALIZER(qcow2_create_opts.head), | |
2813 | .desc = { | |
2814 | { | |
2815 | .name = BLOCK_OPT_SIZE, | |
2816 | .type = QEMU_OPT_SIZE, | |
2817 | .help = "Virtual disk size" | |
2818 | }, | |
2819 | { | |
2820 | .name = BLOCK_OPT_COMPAT_LEVEL, | |
2821 | .type = QEMU_OPT_STRING, | |
2822 | .help = "Compatibility level (0.10 or 1.1)" | |
2823 | }, | |
2824 | { | |
2825 | .name = BLOCK_OPT_BACKING_FILE, | |
2826 | .type = QEMU_OPT_STRING, | |
2827 | .help = "File name of a base image" | |
2828 | }, | |
2829 | { | |
2830 | .name = BLOCK_OPT_BACKING_FMT, | |
2831 | .type = QEMU_OPT_STRING, | |
2832 | .help = "Image format of the base image" | |
2833 | }, | |
2834 | { | |
2835 | .name = BLOCK_OPT_ENCRYPT, | |
2836 | .type = QEMU_OPT_BOOL, | |
2837 | .help = "Encrypt the image", | |
2838 | .def_value_str = "off" | |
2839 | }, | |
2840 | { | |
2841 | .name = BLOCK_OPT_CLUSTER_SIZE, | |
2842 | .type = QEMU_OPT_SIZE, | |
2843 | .help = "qcow2 cluster size", | |
2844 | .def_value_str = stringify(DEFAULT_CLUSTER_SIZE) | |
2845 | }, | |
2846 | { | |
2847 | .name = BLOCK_OPT_PREALLOC, | |
2848 | .type = QEMU_OPT_STRING, | |
0e4271b7 HT |
2849 | .help = "Preallocation mode (allowed values: off, metadata, " |
2850 | "falloc, full)" | |
1bd0e2d1 CL |
2851 | }, |
2852 | { | |
2853 | .name = BLOCK_OPT_LAZY_REFCOUNTS, | |
2854 | .type = QEMU_OPT_BOOL, | |
2855 | .help = "Postpone refcount updates", | |
2856 | .def_value_str = "off" | |
2857 | }, | |
2858 | { /* end of list */ } | |
2859 | } | |
20d97356 BS |
2860 | }; |
2861 | ||
5f535a94 | 2862 | BlockDriver bdrv_qcow2 = { |
7c80ab3f JS |
2863 | .format_name = "qcow2", |
2864 | .instance_size = sizeof(BDRVQcowState), | |
2865 | .bdrv_probe = qcow2_probe, | |
2866 | .bdrv_open = qcow2_open, | |
2867 | .bdrv_close = qcow2_close, | |
21d82ac9 | 2868 | .bdrv_reopen_prepare = qcow2_reopen_prepare, |
c282e1fd | 2869 | .bdrv_create = qcow2_create, |
3ac21627 | 2870 | .bdrv_has_zero_init = bdrv_has_zero_init_1, |
b6b8a333 | 2871 | .bdrv_co_get_block_status = qcow2_co_get_block_status, |
7c80ab3f | 2872 | .bdrv_set_key = qcow2_set_key, |
7c80ab3f | 2873 | |
c68b89ac KW |
2874 | .bdrv_co_readv = qcow2_co_readv, |
2875 | .bdrv_co_writev = qcow2_co_writev, | |
eb489bb1 | 2876 | .bdrv_co_flush_to_os = qcow2_co_flush_to_os, |
419b19d9 | 2877 | |
621f0589 | 2878 | .bdrv_co_write_zeroes = qcow2_co_write_zeroes, |
6db39ae2 | 2879 | .bdrv_co_discard = qcow2_co_discard, |
419b19d9 | 2880 | .bdrv_truncate = qcow2_truncate, |
7c80ab3f | 2881 | .bdrv_write_compressed = qcow2_write_compressed, |
491d27e2 | 2882 | .bdrv_make_empty = qcow2_make_empty, |
20d97356 BS |
2883 | |
2884 | .bdrv_snapshot_create = qcow2_snapshot_create, | |
2885 | .bdrv_snapshot_goto = qcow2_snapshot_goto, | |
2886 | .bdrv_snapshot_delete = qcow2_snapshot_delete, | |
2887 | .bdrv_snapshot_list = qcow2_snapshot_list, | |
1bd0e2d1 CL |
2888 | .bdrv_snapshot_load_tmp = qcow2_snapshot_load_tmp, |
2889 | .bdrv_get_info = qcow2_get_info, | |
37764dfb | 2890 | .bdrv_get_specific_info = qcow2_get_specific_info, |
20d97356 | 2891 | |
7c80ab3f JS |
2892 | .bdrv_save_vmstate = qcow2_save_vmstate, |
2893 | .bdrv_load_vmstate = qcow2_load_vmstate, | |
20d97356 | 2894 | |
8ee79e70 | 2895 | .supports_backing = true, |
20d97356 BS |
2896 | .bdrv_change_backing_file = qcow2_change_backing_file, |
2897 | ||
d34682cd | 2898 | .bdrv_refresh_limits = qcow2_refresh_limits, |
06d9260f AL |
2899 | .bdrv_invalidate_cache = qcow2_invalidate_cache, |
2900 | ||
1bd0e2d1 CL |
2901 | .create_opts = &qcow2_create_opts, |
2902 | .bdrv_check = qcow2_check, | |
c282e1fd | 2903 | .bdrv_amend_options = qcow2_amend_options, |
20d97356 BS |
2904 | }; |
2905 | ||
5efa9d5a AL |
2906 | static void bdrv_qcow2_init(void) |
2907 | { | |
2908 | bdrv_register(&bdrv_qcow2); | |
2909 | } | |
2910 | ||
2911 | block_init(bdrv_qcow2_init); |