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Commit | Line | Data |
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585f8587 FB |
1 | /* |
2 | * Block driver for the QCOW version 2 format | |
5fafdf24 | 3 | * |
585f8587 | 4 | * Copyright (c) 2004-2006 Fabrice Bellard |
5fafdf24 | 5 | * |
585f8587 FB |
6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
7 | * of this software and associated documentation files (the "Software"), to deal | |
8 | * in the Software without restriction, including without limitation the rights | |
9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
10 | * copies of the Software, and to permit persons to whom the Software is | |
11 | * furnished to do so, subject to the following conditions: | |
12 | * | |
13 | * The above copyright notice and this permission notice shall be included in | |
14 | * all copies or substantial portions of the Software. | |
15 | * | |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
22 | * THE SOFTWARE. | |
23 | */ | |
faf07963 | 24 | #include "qemu-common.h" |
737e150e | 25 | #include "block/block_int.h" |
1de7afc9 | 26 | #include "qemu/module.h" |
585f8587 | 27 | #include <zlib.h> |
753d9b82 | 28 | #include "qemu/aes.h" |
f7d0fe02 | 29 | #include "block/qcow2.h" |
1de7afc9 | 30 | #include "qemu/error-report.h" |
7b1b5d19 | 31 | #include "qapi/qmp/qerror.h" |
acdfb480 | 32 | #include "qapi/qmp/qbool.h" |
3cce16f4 | 33 | #include "trace.h" |
1bd0e2d1 | 34 | #include "qemu/option_int.h" |
585f8587 FB |
35 | |
36 | /* | |
37 | Differences with QCOW: | |
38 | ||
39 | - Support for multiple incremental snapshots. | |
40 | - Memory management by reference counts. | |
41 | - Clusters which have a reference count of one have the bit | |
42 | QCOW_OFLAG_COPIED to optimize write performance. | |
5fafdf24 | 43 | - Size of compressed clusters is stored in sectors to reduce bit usage |
585f8587 FB |
44 | in the cluster offsets. |
45 | - Support for storing additional data (such as the VM state) in the | |
3b46e624 | 46 | snapshots. |
585f8587 FB |
47 | - If a backing store is used, the cluster size is not constrained |
48 | (could be backported to QCOW). | |
49 | - L2 tables have always a size of one cluster. | |
50 | */ | |
51 | ||
9b80ddf3 AL |
52 | |
53 | typedef struct { | |
54 | uint32_t magic; | |
55 | uint32_t len; | |
c4217f64 | 56 | } QEMU_PACKED QCowExtension; |
21d82ac9 | 57 | |
7c80ab3f JS |
58 | #define QCOW2_EXT_MAGIC_END 0 |
59 | #define QCOW2_EXT_MAGIC_BACKING_FORMAT 0xE2792ACA | |
cfcc4c62 | 60 | #define QCOW2_EXT_MAGIC_FEATURE_TABLE 0x6803f857 |
9b80ddf3 | 61 | |
7c80ab3f | 62 | static int qcow2_probe(const uint8_t *buf, int buf_size, const char *filename) |
585f8587 FB |
63 | { |
64 | const QCowHeader *cow_header = (const void *)buf; | |
3b46e624 | 65 | |
585f8587 FB |
66 | if (buf_size >= sizeof(QCowHeader) && |
67 | be32_to_cpu(cow_header->magic) == QCOW_MAGIC && | |
6744cbab | 68 | be32_to_cpu(cow_header->version) >= 2) |
585f8587 FB |
69 | return 100; |
70 | else | |
71 | return 0; | |
72 | } | |
73 | ||
9b80ddf3 AL |
74 | |
75 | /* | |
76 | * read qcow2 extension and fill bs | |
77 | * start reading from start_offset | |
78 | * finish reading upon magic of value 0 or when end_offset reached | |
79 | * unknown magic is skipped (future extension this version knows nothing about) | |
80 | * return 0 upon success, non-0 otherwise | |
81 | */ | |
7c80ab3f | 82 | static int qcow2_read_extensions(BlockDriverState *bs, uint64_t start_offset, |
3ef6c40a HR |
83 | uint64_t end_offset, void **p_feature_table, |
84 | Error **errp) | |
9b80ddf3 | 85 | { |
75bab85c | 86 | BDRVQcowState *s = bs->opaque; |
9b80ddf3 AL |
87 | QCowExtension ext; |
88 | uint64_t offset; | |
75bab85c | 89 | int ret; |
9b80ddf3 AL |
90 | |
91 | #ifdef DEBUG_EXT | |
7c80ab3f | 92 | printf("qcow2_read_extensions: start=%ld end=%ld\n", start_offset, end_offset); |
9b80ddf3 AL |
93 | #endif |
94 | offset = start_offset; | |
95 | while (offset < end_offset) { | |
96 | ||
97 | #ifdef DEBUG_EXT | |
98 | /* Sanity check */ | |
99 | if (offset > s->cluster_size) | |
7c80ab3f | 100 | printf("qcow2_read_extension: suspicious offset %lu\n", offset); |
9b80ddf3 | 101 | |
9b2260cb | 102 | printf("attempting to read extended header in offset %lu\n", offset); |
9b80ddf3 AL |
103 | #endif |
104 | ||
3ef6c40a HR |
105 | ret = bdrv_pread(bs->file, offset, &ext, sizeof(ext)); |
106 | if (ret < 0) { | |
107 | error_setg_errno(errp, -ret, "qcow2_read_extension: ERROR: " | |
108 | "pread fail from offset %" PRIu64, offset); | |
9b80ddf3 AL |
109 | return 1; |
110 | } | |
111 | be32_to_cpus(&ext.magic); | |
112 | be32_to_cpus(&ext.len); | |
113 | offset += sizeof(ext); | |
114 | #ifdef DEBUG_EXT | |
115 | printf("ext.magic = 0x%x\n", ext.magic); | |
116 | #endif | |
64ca6aee | 117 | if (ext.len > end_offset - offset) { |
3ef6c40a | 118 | error_setg(errp, "Header extension too large"); |
64ca6aee KW |
119 | return -EINVAL; |
120 | } | |
121 | ||
9b80ddf3 | 122 | switch (ext.magic) { |
7c80ab3f | 123 | case QCOW2_EXT_MAGIC_END: |
9b80ddf3 | 124 | return 0; |
f965509c | 125 | |
7c80ab3f | 126 | case QCOW2_EXT_MAGIC_BACKING_FORMAT: |
f965509c | 127 | if (ext.len >= sizeof(bs->backing_format)) { |
521b2b5d HR |
128 | error_setg(errp, "ERROR: ext_backing_format: len=%" PRIu32 |
129 | " too large (>=%zu)", ext.len, | |
130 | sizeof(bs->backing_format)); | |
f965509c AL |
131 | return 2; |
132 | } | |
3ef6c40a HR |
133 | ret = bdrv_pread(bs->file, offset, bs->backing_format, ext.len); |
134 | if (ret < 0) { | |
135 | error_setg_errno(errp, -ret, "ERROR: ext_backing_format: " | |
136 | "Could not read format name"); | |
f965509c | 137 | return 3; |
3ef6c40a | 138 | } |
f965509c AL |
139 | bs->backing_format[ext.len] = '\0'; |
140 | #ifdef DEBUG_EXT | |
141 | printf("Qcow2: Got format extension %s\n", bs->backing_format); | |
142 | #endif | |
f965509c AL |
143 | break; |
144 | ||
cfcc4c62 KW |
145 | case QCOW2_EXT_MAGIC_FEATURE_TABLE: |
146 | if (p_feature_table != NULL) { | |
147 | void* feature_table = g_malloc0(ext.len + 2 * sizeof(Qcow2Feature)); | |
148 | ret = bdrv_pread(bs->file, offset , feature_table, ext.len); | |
149 | if (ret < 0) { | |
3ef6c40a HR |
150 | error_setg_errno(errp, -ret, "ERROR: ext_feature_table: " |
151 | "Could not read table"); | |
cfcc4c62 KW |
152 | return ret; |
153 | } | |
154 | ||
155 | *p_feature_table = feature_table; | |
156 | } | |
157 | break; | |
158 | ||
9b80ddf3 | 159 | default: |
75bab85c KW |
160 | /* unknown magic - save it in case we need to rewrite the header */ |
161 | { | |
162 | Qcow2UnknownHeaderExtension *uext; | |
163 | ||
164 | uext = g_malloc0(sizeof(*uext) + ext.len); | |
165 | uext->magic = ext.magic; | |
166 | uext->len = ext.len; | |
167 | QLIST_INSERT_HEAD(&s->unknown_header_ext, uext, next); | |
168 | ||
169 | ret = bdrv_pread(bs->file, offset , uext->data, uext->len); | |
170 | if (ret < 0) { | |
3ef6c40a HR |
171 | error_setg_errno(errp, -ret, "ERROR: unknown extension: " |
172 | "Could not read data"); | |
75bab85c KW |
173 | return ret; |
174 | } | |
75bab85c | 175 | } |
9b80ddf3 AL |
176 | break; |
177 | } | |
fd29b4bb KW |
178 | |
179 | offset += ((ext.len + 7) & ~7); | |
9b80ddf3 AL |
180 | } |
181 | ||
182 | return 0; | |
183 | } | |
184 | ||
75bab85c KW |
185 | static void cleanup_unknown_header_ext(BlockDriverState *bs) |
186 | { | |
187 | BDRVQcowState *s = bs->opaque; | |
188 | Qcow2UnknownHeaderExtension *uext, *next; | |
189 | ||
190 | QLIST_FOREACH_SAFE(uext, &s->unknown_header_ext, next, next) { | |
191 | QLIST_REMOVE(uext, next); | |
192 | g_free(uext); | |
193 | } | |
194 | } | |
9b80ddf3 | 195 | |
3ef6c40a HR |
196 | static void GCC_FMT_ATTR(3, 4) report_unsupported(BlockDriverState *bs, |
197 | Error **errp, const char *fmt, ...) | |
6744cbab KW |
198 | { |
199 | char msg[64]; | |
200 | va_list ap; | |
201 | ||
202 | va_start(ap, fmt); | |
203 | vsnprintf(msg, sizeof(msg), fmt, ap); | |
204 | va_end(ap); | |
205 | ||
3ef6c40a HR |
206 | error_set(errp, QERR_UNKNOWN_BLOCK_FORMAT_FEATURE, bs->device_name, "qcow2", |
207 | msg); | |
6744cbab KW |
208 | } |
209 | ||
cfcc4c62 | 210 | static void report_unsupported_feature(BlockDriverState *bs, |
3ef6c40a | 211 | Error **errp, Qcow2Feature *table, uint64_t mask) |
cfcc4c62 | 212 | { |
12ac6d3d KW |
213 | char *features = g_strdup(""); |
214 | char *old; | |
215 | ||
cfcc4c62 KW |
216 | while (table && table->name[0] != '\0') { |
217 | if (table->type == QCOW2_FEAT_TYPE_INCOMPATIBLE) { | |
12ac6d3d KW |
218 | if (mask & (1ULL << table->bit)) { |
219 | old = features; | |
220 | features = g_strdup_printf("%s%s%.46s", old, *old ? ", " : "", | |
221 | table->name); | |
222 | g_free(old); | |
223 | mask &= ~(1ULL << table->bit); | |
cfcc4c62 KW |
224 | } |
225 | } | |
226 | table++; | |
227 | } | |
228 | ||
229 | if (mask) { | |
12ac6d3d KW |
230 | old = features; |
231 | features = g_strdup_printf("%s%sUnknown incompatible feature: %" PRIx64, | |
232 | old, *old ? ", " : "", mask); | |
233 | g_free(old); | |
cfcc4c62 | 234 | } |
12ac6d3d KW |
235 | |
236 | report_unsupported(bs, errp, "%s", features); | |
237 | g_free(features); | |
cfcc4c62 KW |
238 | } |
239 | ||
bfe8043e SH |
240 | /* |
241 | * Sets the dirty bit and flushes afterwards if necessary. | |
242 | * | |
243 | * The incompatible_features bit is only set if the image file header was | |
244 | * updated successfully. Therefore it is not required to check the return | |
245 | * value of this function. | |
246 | */ | |
280d3735 | 247 | int qcow2_mark_dirty(BlockDriverState *bs) |
bfe8043e SH |
248 | { |
249 | BDRVQcowState *s = bs->opaque; | |
250 | uint64_t val; | |
251 | int ret; | |
252 | ||
253 | assert(s->qcow_version >= 3); | |
254 | ||
255 | if (s->incompatible_features & QCOW2_INCOMPAT_DIRTY) { | |
256 | return 0; /* already dirty */ | |
257 | } | |
258 | ||
259 | val = cpu_to_be64(s->incompatible_features | QCOW2_INCOMPAT_DIRTY); | |
260 | ret = bdrv_pwrite(bs->file, offsetof(QCowHeader, incompatible_features), | |
261 | &val, sizeof(val)); | |
262 | if (ret < 0) { | |
263 | return ret; | |
264 | } | |
265 | ret = bdrv_flush(bs->file); | |
266 | if (ret < 0) { | |
267 | return ret; | |
268 | } | |
269 | ||
270 | /* Only treat image as dirty if the header was updated successfully */ | |
271 | s->incompatible_features |= QCOW2_INCOMPAT_DIRTY; | |
272 | return 0; | |
273 | } | |
274 | ||
c61d0004 SH |
275 | /* |
276 | * Clears the dirty bit and flushes before if necessary. Only call this | |
277 | * function when there are no pending requests, it does not guard against | |
278 | * concurrent requests dirtying the image. | |
279 | */ | |
280 | static int qcow2_mark_clean(BlockDriverState *bs) | |
281 | { | |
282 | BDRVQcowState *s = bs->opaque; | |
283 | ||
284 | if (s->incompatible_features & QCOW2_INCOMPAT_DIRTY) { | |
4c2e5f8f KW |
285 | int ret; |
286 | ||
287 | s->incompatible_features &= ~QCOW2_INCOMPAT_DIRTY; | |
288 | ||
289 | ret = bdrv_flush(bs); | |
c61d0004 SH |
290 | if (ret < 0) { |
291 | return ret; | |
292 | } | |
293 | ||
c61d0004 SH |
294 | return qcow2_update_header(bs); |
295 | } | |
296 | return 0; | |
297 | } | |
298 | ||
69c98726 HR |
299 | /* |
300 | * Marks the image as corrupt. | |
301 | */ | |
302 | int qcow2_mark_corrupt(BlockDriverState *bs) | |
303 | { | |
304 | BDRVQcowState *s = bs->opaque; | |
305 | ||
306 | s->incompatible_features |= QCOW2_INCOMPAT_CORRUPT; | |
307 | return qcow2_update_header(bs); | |
308 | } | |
309 | ||
310 | /* | |
311 | * Marks the image as consistent, i.e., unsets the corrupt bit, and flushes | |
312 | * before if necessary. | |
313 | */ | |
314 | int qcow2_mark_consistent(BlockDriverState *bs) | |
315 | { | |
316 | BDRVQcowState *s = bs->opaque; | |
317 | ||
318 | if (s->incompatible_features & QCOW2_INCOMPAT_CORRUPT) { | |
319 | int ret = bdrv_flush(bs); | |
320 | if (ret < 0) { | |
321 | return ret; | |
322 | } | |
323 | ||
324 | s->incompatible_features &= ~QCOW2_INCOMPAT_CORRUPT; | |
325 | return qcow2_update_header(bs); | |
326 | } | |
327 | return 0; | |
328 | } | |
329 | ||
acbe5982 SH |
330 | static int qcow2_check(BlockDriverState *bs, BdrvCheckResult *result, |
331 | BdrvCheckMode fix) | |
332 | { | |
333 | int ret = qcow2_check_refcounts(bs, result, fix); | |
334 | if (ret < 0) { | |
335 | return ret; | |
336 | } | |
337 | ||
338 | if (fix && result->check_errors == 0 && result->corruptions == 0) { | |
24530f3e HR |
339 | ret = qcow2_mark_clean(bs); |
340 | if (ret < 0) { | |
341 | return ret; | |
342 | } | |
343 | return qcow2_mark_consistent(bs); | |
acbe5982 SH |
344 | } |
345 | return ret; | |
346 | } | |
347 | ||
8c7de283 KW |
348 | static int validate_table_offset(BlockDriverState *bs, uint64_t offset, |
349 | uint64_t entries, size_t entry_len) | |
350 | { | |
351 | BDRVQcowState *s = bs->opaque; | |
352 | uint64_t size; | |
353 | ||
354 | /* Use signed INT64_MAX as the maximum even for uint64_t header fields, | |
355 | * because values will be passed to qemu functions taking int64_t. */ | |
356 | if (entries > INT64_MAX / entry_len) { | |
357 | return -EINVAL; | |
358 | } | |
359 | ||
360 | size = entries * entry_len; | |
361 | ||
362 | if (INT64_MAX - size < offset) { | |
363 | return -EINVAL; | |
364 | } | |
365 | ||
366 | /* Tables must be cluster aligned */ | |
367 | if (offset & (s->cluster_size - 1)) { | |
368 | return -EINVAL; | |
369 | } | |
370 | ||
371 | return 0; | |
372 | } | |
373 | ||
74c4510a KW |
374 | static QemuOptsList qcow2_runtime_opts = { |
375 | .name = "qcow2", | |
376 | .head = QTAILQ_HEAD_INITIALIZER(qcow2_runtime_opts.head), | |
377 | .desc = { | |
378 | { | |
64aa99d3 | 379 | .name = QCOW2_OPT_LAZY_REFCOUNTS, |
74c4510a KW |
380 | .type = QEMU_OPT_BOOL, |
381 | .help = "Postpone refcount updates", | |
382 | }, | |
67af674e KW |
383 | { |
384 | .name = QCOW2_OPT_DISCARD_REQUEST, | |
385 | .type = QEMU_OPT_BOOL, | |
386 | .help = "Pass guest discard requests to the layer below", | |
387 | }, | |
388 | { | |
389 | .name = QCOW2_OPT_DISCARD_SNAPSHOT, | |
390 | .type = QEMU_OPT_BOOL, | |
391 | .help = "Generate discard requests when snapshot related space " | |
392 | "is freed", | |
393 | }, | |
394 | { | |
395 | .name = QCOW2_OPT_DISCARD_OTHER, | |
396 | .type = QEMU_OPT_BOOL, | |
397 | .help = "Generate discard requests when other clusters are freed", | |
398 | }, | |
05de7e86 HR |
399 | { |
400 | .name = QCOW2_OPT_OVERLAP, | |
401 | .type = QEMU_OPT_STRING, | |
402 | .help = "Selects which overlap checks to perform from a range of " | |
403 | "templates (none, constant, cached, all)", | |
404 | }, | |
405 | { | |
406 | .name = QCOW2_OPT_OVERLAP_MAIN_HEADER, | |
407 | .type = QEMU_OPT_BOOL, | |
408 | .help = "Check for unintended writes into the main qcow2 header", | |
409 | }, | |
410 | { | |
411 | .name = QCOW2_OPT_OVERLAP_ACTIVE_L1, | |
412 | .type = QEMU_OPT_BOOL, | |
413 | .help = "Check for unintended writes into the active L1 table", | |
414 | }, | |
415 | { | |
416 | .name = QCOW2_OPT_OVERLAP_ACTIVE_L2, | |
417 | .type = QEMU_OPT_BOOL, | |
418 | .help = "Check for unintended writes into an active L2 table", | |
419 | }, | |
420 | { | |
421 | .name = QCOW2_OPT_OVERLAP_REFCOUNT_TABLE, | |
422 | .type = QEMU_OPT_BOOL, | |
423 | .help = "Check for unintended writes into the refcount table", | |
424 | }, | |
425 | { | |
426 | .name = QCOW2_OPT_OVERLAP_REFCOUNT_BLOCK, | |
427 | .type = QEMU_OPT_BOOL, | |
428 | .help = "Check for unintended writes into a refcount block", | |
429 | }, | |
430 | { | |
431 | .name = QCOW2_OPT_OVERLAP_SNAPSHOT_TABLE, | |
432 | .type = QEMU_OPT_BOOL, | |
433 | .help = "Check for unintended writes into the snapshot table", | |
434 | }, | |
435 | { | |
436 | .name = QCOW2_OPT_OVERLAP_INACTIVE_L1, | |
437 | .type = QEMU_OPT_BOOL, | |
438 | .help = "Check for unintended writes into an inactive L1 table", | |
439 | }, | |
440 | { | |
441 | .name = QCOW2_OPT_OVERLAP_INACTIVE_L2, | |
442 | .type = QEMU_OPT_BOOL, | |
443 | .help = "Check for unintended writes into an inactive L2 table", | |
444 | }, | |
74c4510a KW |
445 | { /* end of list */ } |
446 | }, | |
447 | }; | |
448 | ||
4092e99d HR |
449 | static const char *overlap_bool_option_names[QCOW2_OL_MAX_BITNR] = { |
450 | [QCOW2_OL_MAIN_HEADER_BITNR] = QCOW2_OPT_OVERLAP_MAIN_HEADER, | |
451 | [QCOW2_OL_ACTIVE_L1_BITNR] = QCOW2_OPT_OVERLAP_ACTIVE_L1, | |
452 | [QCOW2_OL_ACTIVE_L2_BITNR] = QCOW2_OPT_OVERLAP_ACTIVE_L2, | |
453 | [QCOW2_OL_REFCOUNT_TABLE_BITNR] = QCOW2_OPT_OVERLAP_REFCOUNT_TABLE, | |
454 | [QCOW2_OL_REFCOUNT_BLOCK_BITNR] = QCOW2_OPT_OVERLAP_REFCOUNT_BLOCK, | |
455 | [QCOW2_OL_SNAPSHOT_TABLE_BITNR] = QCOW2_OPT_OVERLAP_SNAPSHOT_TABLE, | |
456 | [QCOW2_OL_INACTIVE_L1_BITNR] = QCOW2_OPT_OVERLAP_INACTIVE_L1, | |
457 | [QCOW2_OL_INACTIVE_L2_BITNR] = QCOW2_OPT_OVERLAP_INACTIVE_L2, | |
458 | }; | |
459 | ||
015a1036 HR |
460 | static int qcow2_open(BlockDriverState *bs, QDict *options, int flags, |
461 | Error **errp) | |
585f8587 FB |
462 | { |
463 | BDRVQcowState *s = bs->opaque; | |
6d33e8e7 KW |
464 | unsigned int len, i; |
465 | int ret = 0; | |
585f8587 | 466 | QCowHeader header; |
74c4510a KW |
467 | QemuOpts *opts; |
468 | Error *local_err = NULL; | |
9b80ddf3 | 469 | uint64_t ext_end; |
2cf7cfa1 | 470 | uint64_t l1_vm_state_index; |
1fa5cc83 HR |
471 | const char *opt_overlap_check; |
472 | int overlap_check_template = 0; | |
585f8587 | 473 | |
6d85a57e JS |
474 | ret = bdrv_pread(bs->file, 0, &header, sizeof(header)); |
475 | if (ret < 0) { | |
3ef6c40a | 476 | error_setg_errno(errp, -ret, "Could not read qcow2 header"); |
585f8587 | 477 | goto fail; |
6d85a57e | 478 | } |
585f8587 FB |
479 | be32_to_cpus(&header.magic); |
480 | be32_to_cpus(&header.version); | |
481 | be64_to_cpus(&header.backing_file_offset); | |
482 | be32_to_cpus(&header.backing_file_size); | |
483 | be64_to_cpus(&header.size); | |
484 | be32_to_cpus(&header.cluster_bits); | |
485 | be32_to_cpus(&header.crypt_method); | |
486 | be64_to_cpus(&header.l1_table_offset); | |
487 | be32_to_cpus(&header.l1_size); | |
488 | be64_to_cpus(&header.refcount_table_offset); | |
489 | be32_to_cpus(&header.refcount_table_clusters); | |
490 | be64_to_cpus(&header.snapshots_offset); | |
491 | be32_to_cpus(&header.nb_snapshots); | |
3b46e624 | 492 | |
e8cdcec1 | 493 | if (header.magic != QCOW_MAGIC) { |
3ef6c40a | 494 | error_setg(errp, "Image is not in qcow2 format"); |
76abe407 | 495 | ret = -EINVAL; |
585f8587 | 496 | goto fail; |
6d85a57e | 497 | } |
6744cbab | 498 | if (header.version < 2 || header.version > 3) { |
521b2b5d | 499 | report_unsupported(bs, errp, "QCOW version %" PRIu32, header.version); |
6744cbab KW |
500 | ret = -ENOTSUP; |
501 | goto fail; | |
502 | } | |
503 | ||
504 | s->qcow_version = header.version; | |
505 | ||
24342f2c KW |
506 | /* Initialise cluster size */ |
507 | if (header.cluster_bits < MIN_CLUSTER_BITS || | |
508 | header.cluster_bits > MAX_CLUSTER_BITS) { | |
521b2b5d HR |
509 | error_setg(errp, "Unsupported cluster size: 2^%" PRIu32, |
510 | header.cluster_bits); | |
24342f2c KW |
511 | ret = -EINVAL; |
512 | goto fail; | |
513 | } | |
514 | ||
515 | s->cluster_bits = header.cluster_bits; | |
516 | s->cluster_size = 1 << s->cluster_bits; | |
517 | s->cluster_sectors = 1 << (s->cluster_bits - 9); | |
518 | ||
6744cbab KW |
519 | /* Initialise version 3 header fields */ |
520 | if (header.version == 2) { | |
521 | header.incompatible_features = 0; | |
522 | header.compatible_features = 0; | |
523 | header.autoclear_features = 0; | |
524 | header.refcount_order = 4; | |
525 | header.header_length = 72; | |
526 | } else { | |
527 | be64_to_cpus(&header.incompatible_features); | |
528 | be64_to_cpus(&header.compatible_features); | |
529 | be64_to_cpus(&header.autoclear_features); | |
530 | be32_to_cpus(&header.refcount_order); | |
531 | be32_to_cpus(&header.header_length); | |
24342f2c KW |
532 | |
533 | if (header.header_length < 104) { | |
534 | error_setg(errp, "qcow2 header too short"); | |
535 | ret = -EINVAL; | |
536 | goto fail; | |
537 | } | |
538 | } | |
539 | ||
540 | if (header.header_length > s->cluster_size) { | |
541 | error_setg(errp, "qcow2 header exceeds cluster size"); | |
542 | ret = -EINVAL; | |
543 | goto fail; | |
6744cbab KW |
544 | } |
545 | ||
546 | if (header.header_length > sizeof(header)) { | |
547 | s->unknown_header_fields_size = header.header_length - sizeof(header); | |
548 | s->unknown_header_fields = g_malloc(s->unknown_header_fields_size); | |
549 | ret = bdrv_pread(bs->file, sizeof(header), s->unknown_header_fields, | |
550 | s->unknown_header_fields_size); | |
551 | if (ret < 0) { | |
3ef6c40a HR |
552 | error_setg_errno(errp, -ret, "Could not read unknown qcow2 header " |
553 | "fields"); | |
6744cbab KW |
554 | goto fail; |
555 | } | |
556 | } | |
557 | ||
a1b3955c KW |
558 | if (header.backing_file_offset > s->cluster_size) { |
559 | error_setg(errp, "Invalid backing file offset"); | |
560 | ret = -EINVAL; | |
561 | goto fail; | |
562 | } | |
563 | ||
cfcc4c62 KW |
564 | if (header.backing_file_offset) { |
565 | ext_end = header.backing_file_offset; | |
566 | } else { | |
567 | ext_end = 1 << header.cluster_bits; | |
568 | } | |
569 | ||
6744cbab KW |
570 | /* Handle feature bits */ |
571 | s->incompatible_features = header.incompatible_features; | |
572 | s->compatible_features = header.compatible_features; | |
573 | s->autoclear_features = header.autoclear_features; | |
574 | ||
c61d0004 | 575 | if (s->incompatible_features & ~QCOW2_INCOMPAT_MASK) { |
cfcc4c62 KW |
576 | void *feature_table = NULL; |
577 | qcow2_read_extensions(bs, header.header_length, ext_end, | |
3ef6c40a HR |
578 | &feature_table, NULL); |
579 | report_unsupported_feature(bs, errp, feature_table, | |
c61d0004 SH |
580 | s->incompatible_features & |
581 | ~QCOW2_INCOMPAT_MASK); | |
6744cbab | 582 | ret = -ENOTSUP; |
c5a33ee9 | 583 | g_free(feature_table); |
6744cbab KW |
584 | goto fail; |
585 | } | |
586 | ||
69c98726 HR |
587 | if (s->incompatible_features & QCOW2_INCOMPAT_CORRUPT) { |
588 | /* Corrupt images may not be written to unless they are being repaired | |
589 | */ | |
590 | if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_CHECK)) { | |
3ef6c40a HR |
591 | error_setg(errp, "qcow2: Image is corrupt; cannot be opened " |
592 | "read/write"); | |
69c98726 HR |
593 | ret = -EACCES; |
594 | goto fail; | |
595 | } | |
596 | } | |
597 | ||
6744cbab KW |
598 | /* Check support for various header values */ |
599 | if (header.refcount_order != 4) { | |
3ef6c40a | 600 | report_unsupported(bs, errp, "%d bit reference counts", |
6744cbab | 601 | 1 << header.refcount_order); |
e8cdcec1 KW |
602 | ret = -ENOTSUP; |
603 | goto fail; | |
604 | } | |
b6481f37 | 605 | s->refcount_order = header.refcount_order; |
6744cbab | 606 | |
6d85a57e | 607 | if (header.crypt_method > QCOW_CRYPT_AES) { |
521b2b5d | 608 | error_setg(errp, "Unsupported encryption method: %" PRIu32, |
3ef6c40a | 609 | header.crypt_method); |
6d85a57e | 610 | ret = -EINVAL; |
585f8587 | 611 | goto fail; |
6d85a57e | 612 | } |
585f8587 | 613 | s->crypt_method_header = header.crypt_method; |
6d85a57e | 614 | if (s->crypt_method_header) { |
585f8587 | 615 | bs->encrypted = 1; |
6d85a57e | 616 | } |
24342f2c | 617 | |
585f8587 FB |
618 | s->l2_bits = s->cluster_bits - 3; /* L2 is always one cluster */ |
619 | s->l2_size = 1 << s->l2_bits; | |
620 | bs->total_sectors = header.size / 512; | |
621 | s->csize_shift = (62 - (s->cluster_bits - 8)); | |
622 | s->csize_mask = (1 << (s->cluster_bits - 8)) - 1; | |
623 | s->cluster_offset_mask = (1LL << s->csize_shift) - 1; | |
5dab2fad | 624 | |
585f8587 | 625 | s->refcount_table_offset = header.refcount_table_offset; |
5fafdf24 | 626 | s->refcount_table_size = |
585f8587 FB |
627 | header.refcount_table_clusters << (s->cluster_bits - 3); |
628 | ||
2b5d5953 | 629 | if (header.refcount_table_clusters > qcow2_max_refcount_clusters(s)) { |
5dab2fad KW |
630 | error_setg(errp, "Reference count table too large"); |
631 | ret = -EINVAL; | |
632 | goto fail; | |
633 | } | |
634 | ||
8c7de283 KW |
635 | ret = validate_table_offset(bs, s->refcount_table_offset, |
636 | s->refcount_table_size, sizeof(uint64_t)); | |
637 | if (ret < 0) { | |
638 | error_setg(errp, "Invalid reference count table offset"); | |
639 | goto fail; | |
640 | } | |
641 | ||
ce48f2f4 KW |
642 | /* Snapshot table offset/length */ |
643 | if (header.nb_snapshots > QCOW_MAX_SNAPSHOTS) { | |
644 | error_setg(errp, "Too many snapshots"); | |
645 | ret = -EINVAL; | |
646 | goto fail; | |
647 | } | |
648 | ||
649 | ret = validate_table_offset(bs, header.snapshots_offset, | |
650 | header.nb_snapshots, | |
651 | sizeof(QCowSnapshotHeader)); | |
652 | if (ret < 0) { | |
653 | error_setg(errp, "Invalid snapshot table offset"); | |
654 | goto fail; | |
655 | } | |
656 | ||
585f8587 | 657 | /* read the level 1 table */ |
6a83f8b5 | 658 | if (header.l1_size > QCOW_MAX_L1_SIZE) { |
2d51c32c KW |
659 | error_setg(errp, "Active L1 table too large"); |
660 | ret = -EFBIG; | |
661 | goto fail; | |
662 | } | |
585f8587 | 663 | s->l1_size = header.l1_size; |
2cf7cfa1 KW |
664 | |
665 | l1_vm_state_index = size_to_l1(s, header.size); | |
666 | if (l1_vm_state_index > INT_MAX) { | |
3ef6c40a | 667 | error_setg(errp, "Image is too big"); |
2cf7cfa1 KW |
668 | ret = -EFBIG; |
669 | goto fail; | |
670 | } | |
671 | s->l1_vm_state_index = l1_vm_state_index; | |
672 | ||
585f8587 FB |
673 | /* the L1 table must contain at least enough entries to put |
674 | header.size bytes */ | |
6d85a57e | 675 | if (s->l1_size < s->l1_vm_state_index) { |
3ef6c40a | 676 | error_setg(errp, "L1 table is too small"); |
6d85a57e | 677 | ret = -EINVAL; |
585f8587 | 678 | goto fail; |
6d85a57e | 679 | } |
2d51c32c KW |
680 | |
681 | ret = validate_table_offset(bs, header.l1_table_offset, | |
682 | header.l1_size, sizeof(uint64_t)); | |
683 | if (ret < 0) { | |
684 | error_setg(errp, "Invalid L1 table offset"); | |
685 | goto fail; | |
686 | } | |
585f8587 | 687 | s->l1_table_offset = header.l1_table_offset; |
2d51c32c KW |
688 | |
689 | ||
d191d12d | 690 | if (s->l1_size > 0) { |
7267c094 | 691 | s->l1_table = g_malloc0( |
d191d12d | 692 | align_offset(s->l1_size * sizeof(uint64_t), 512)); |
6d85a57e JS |
693 | ret = bdrv_pread(bs->file, s->l1_table_offset, s->l1_table, |
694 | s->l1_size * sizeof(uint64_t)); | |
695 | if (ret < 0) { | |
3ef6c40a | 696 | error_setg_errno(errp, -ret, "Could not read L1 table"); |
d191d12d | 697 | goto fail; |
6d85a57e | 698 | } |
d191d12d SW |
699 | for(i = 0;i < s->l1_size; i++) { |
700 | be64_to_cpus(&s->l1_table[i]); | |
701 | } | |
585f8587 | 702 | } |
29c1a730 KW |
703 | |
704 | /* alloc L2 table/refcount block cache */ | |
6af4e9ea PB |
705 | s->l2_table_cache = qcow2_cache_create(bs, L2_CACHE_SIZE); |
706 | s->refcount_block_cache = qcow2_cache_create(bs, REFCOUNT_CACHE_SIZE); | |
29c1a730 | 707 | |
7267c094 | 708 | s->cluster_cache = g_malloc(s->cluster_size); |
585f8587 | 709 | /* one more sector for decompressed data alignment */ |
dea43a65 | 710 | s->cluster_data = qemu_blockalign(bs, QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size |
095a9c58 | 711 | + 512); |
585f8587 | 712 | s->cluster_cache_offset = -1; |
06d9260f | 713 | s->flags = flags; |
3b46e624 | 714 | |
6d85a57e JS |
715 | ret = qcow2_refcount_init(bs); |
716 | if (ret != 0) { | |
3ef6c40a | 717 | error_setg_errno(errp, -ret, "Could not initialize refcount handling"); |
585f8587 | 718 | goto fail; |
6d85a57e | 719 | } |
585f8587 | 720 | |
72cf2d4f | 721 | QLIST_INIT(&s->cluster_allocs); |
0b919fae | 722 | QTAILQ_INIT(&s->discards); |
f214978a | 723 | |
9b80ddf3 | 724 | /* read qcow2 extensions */ |
3ef6c40a HR |
725 | if (qcow2_read_extensions(bs, header.header_length, ext_end, NULL, |
726 | &local_err)) { | |
727 | error_propagate(errp, local_err); | |
6d85a57e | 728 | ret = -EINVAL; |
9b80ddf3 | 729 | goto fail; |
6d85a57e | 730 | } |
9b80ddf3 | 731 | |
585f8587 FB |
732 | /* read the backing file name */ |
733 | if (header.backing_file_offset != 0) { | |
734 | len = header.backing_file_size; | |
6d33e8e7 KW |
735 | if (len > MIN(1023, s->cluster_size - header.backing_file_offset)) { |
736 | error_setg(errp, "Backing file name too long"); | |
737 | ret = -EINVAL; | |
738 | goto fail; | |
6d85a57e JS |
739 | } |
740 | ret = bdrv_pread(bs->file, header.backing_file_offset, | |
741 | bs->backing_file, len); | |
742 | if (ret < 0) { | |
3ef6c40a | 743 | error_setg_errno(errp, -ret, "Could not read backing file name"); |
585f8587 | 744 | goto fail; |
6d85a57e | 745 | } |
585f8587 FB |
746 | bs->backing_file[len] = '\0'; |
747 | } | |
42deb29f | 748 | |
11b128f4 KW |
749 | /* Internal snapshots */ |
750 | s->snapshots_offset = header.snapshots_offset; | |
751 | s->nb_snapshots = header.nb_snapshots; | |
752 | ||
42deb29f KW |
753 | ret = qcow2_read_snapshots(bs); |
754 | if (ret < 0) { | |
3ef6c40a | 755 | error_setg_errno(errp, -ret, "Could not read snapshots"); |
585f8587 | 756 | goto fail; |
6d85a57e | 757 | } |
585f8587 | 758 | |
af7b708d | 759 | /* Clear unknown autoclear feature bits */ |
27eb6c09 | 760 | if (!bs->read_only && !(flags & BDRV_O_INCOMING) && s->autoclear_features) { |
af7b708d SH |
761 | s->autoclear_features = 0; |
762 | ret = qcow2_update_header(bs); | |
763 | if (ret < 0) { | |
3ef6c40a | 764 | error_setg_errno(errp, -ret, "Could not update qcow2 header"); |
af7b708d SH |
765 | goto fail; |
766 | } | |
767 | } | |
768 | ||
68d100e9 KW |
769 | /* Initialise locks */ |
770 | qemu_co_mutex_init(&s->lock); | |
771 | ||
c61d0004 | 772 | /* Repair image if dirty */ |
27eb6c09 | 773 | if (!(flags & (BDRV_O_CHECK | BDRV_O_INCOMING)) && !bs->read_only && |
058f8f16 | 774 | (s->incompatible_features & QCOW2_INCOMPAT_DIRTY)) { |
c61d0004 SH |
775 | BdrvCheckResult result = {0}; |
776 | ||
acbe5982 | 777 | ret = qcow2_check(bs, &result, BDRV_FIX_ERRORS); |
c61d0004 | 778 | if (ret < 0) { |
3ef6c40a | 779 | error_setg_errno(errp, -ret, "Could not repair dirty image"); |
c61d0004 SH |
780 | goto fail; |
781 | } | |
782 | } | |
783 | ||
74c4510a | 784 | /* Enable lazy_refcounts according to image and command line options */ |
87ea75d5 | 785 | opts = qemu_opts_create(&qcow2_runtime_opts, NULL, 0, &error_abort); |
74c4510a | 786 | qemu_opts_absorb_qdict(opts, options, &local_err); |
84d18f06 | 787 | if (local_err) { |
3ef6c40a | 788 | error_propagate(errp, local_err); |
74c4510a KW |
789 | ret = -EINVAL; |
790 | goto fail; | |
791 | } | |
792 | ||
acdfb480 | 793 | s->use_lazy_refcounts = qemu_opt_get_bool(opts, QCOW2_OPT_LAZY_REFCOUNTS, |
74c4510a KW |
794 | (s->compatible_features & QCOW2_COMPAT_LAZY_REFCOUNTS)); |
795 | ||
67af674e KW |
796 | s->discard_passthrough[QCOW2_DISCARD_NEVER] = false; |
797 | s->discard_passthrough[QCOW2_DISCARD_ALWAYS] = true; | |
798 | s->discard_passthrough[QCOW2_DISCARD_REQUEST] = | |
799 | qemu_opt_get_bool(opts, QCOW2_OPT_DISCARD_REQUEST, | |
800 | flags & BDRV_O_UNMAP); | |
801 | s->discard_passthrough[QCOW2_DISCARD_SNAPSHOT] = | |
802 | qemu_opt_get_bool(opts, QCOW2_OPT_DISCARD_SNAPSHOT, true); | |
803 | s->discard_passthrough[QCOW2_DISCARD_OTHER] = | |
804 | qemu_opt_get_bool(opts, QCOW2_OPT_DISCARD_OTHER, false); | |
805 | ||
1fa5cc83 HR |
806 | opt_overlap_check = qemu_opt_get(opts, "overlap-check") ?: "cached"; |
807 | if (!strcmp(opt_overlap_check, "none")) { | |
808 | overlap_check_template = 0; | |
809 | } else if (!strcmp(opt_overlap_check, "constant")) { | |
810 | overlap_check_template = QCOW2_OL_CONSTANT; | |
811 | } else if (!strcmp(opt_overlap_check, "cached")) { | |
812 | overlap_check_template = QCOW2_OL_CACHED; | |
813 | } else if (!strcmp(opt_overlap_check, "all")) { | |
814 | overlap_check_template = QCOW2_OL_ALL; | |
815 | } else { | |
816 | error_setg(errp, "Unsupported value '%s' for qcow2 option " | |
817 | "'overlap-check'. Allowed are either of the following: " | |
818 | "none, constant, cached, all", opt_overlap_check); | |
819 | qemu_opts_del(opts); | |
820 | ret = -EINVAL; | |
821 | goto fail; | |
822 | } | |
823 | ||
824 | s->overlap_check = 0; | |
825 | for (i = 0; i < QCOW2_OL_MAX_BITNR; i++) { | |
826 | /* overlap-check defines a template bitmask, but every flag may be | |
827 | * overwritten through the associated boolean option */ | |
828 | s->overlap_check |= | |
829 | qemu_opt_get_bool(opts, overlap_bool_option_names[i], | |
830 | overlap_check_template & (1 << i)) << i; | |
831 | } | |
3e355390 | 832 | |
74c4510a KW |
833 | qemu_opts_del(opts); |
834 | ||
835 | if (s->use_lazy_refcounts && s->qcow_version < 3) { | |
3ef6c40a HR |
836 | error_setg(errp, "Lazy refcounts require a qcow2 image with at least " |
837 | "qemu 1.1 compatibility level"); | |
74c4510a KW |
838 | ret = -EINVAL; |
839 | goto fail; | |
840 | } | |
841 | ||
585f8587 | 842 | #ifdef DEBUG_ALLOC |
6cbc3031 PH |
843 | { |
844 | BdrvCheckResult result = {0}; | |
b35278f7 | 845 | qcow2_check_refcounts(bs, &result, 0); |
6cbc3031 | 846 | } |
585f8587 | 847 | #endif |
6d85a57e | 848 | return ret; |
585f8587 FB |
849 | |
850 | fail: | |
6744cbab | 851 | g_free(s->unknown_header_fields); |
75bab85c | 852 | cleanup_unknown_header_ext(bs); |
ed6ccf0f KW |
853 | qcow2_free_snapshots(bs); |
854 | qcow2_refcount_close(bs); | |
7267c094 | 855 | g_free(s->l1_table); |
cf93980e HR |
856 | /* else pre-write overlap checks in cache_destroy may crash */ |
857 | s->l1_table = NULL; | |
29c1a730 KW |
858 | if (s->l2_table_cache) { |
859 | qcow2_cache_destroy(bs, s->l2_table_cache); | |
860 | } | |
c5a33ee9 PJ |
861 | if (s->refcount_block_cache) { |
862 | qcow2_cache_destroy(bs, s->refcount_block_cache); | |
863 | } | |
7267c094 | 864 | g_free(s->cluster_cache); |
dea43a65 | 865 | qemu_vfree(s->cluster_data); |
6d85a57e | 866 | return ret; |
585f8587 FB |
867 | } |
868 | ||
d34682cd KW |
869 | static int qcow2_refresh_limits(BlockDriverState *bs) |
870 | { | |
871 | BDRVQcowState *s = bs->opaque; | |
872 | ||
873 | bs->bl.write_zeroes_alignment = s->cluster_sectors; | |
874 | ||
875 | return 0; | |
876 | } | |
877 | ||
7c80ab3f | 878 | static int qcow2_set_key(BlockDriverState *bs, const char *key) |
585f8587 FB |
879 | { |
880 | BDRVQcowState *s = bs->opaque; | |
881 | uint8_t keybuf[16]; | |
882 | int len, i; | |
3b46e624 | 883 | |
585f8587 FB |
884 | memset(keybuf, 0, 16); |
885 | len = strlen(key); | |
886 | if (len > 16) | |
887 | len = 16; | |
888 | /* XXX: we could compress the chars to 7 bits to increase | |
889 | entropy */ | |
890 | for(i = 0;i < len;i++) { | |
891 | keybuf[i] = key[i]; | |
892 | } | |
893 | s->crypt_method = s->crypt_method_header; | |
894 | ||
895 | if (AES_set_encrypt_key(keybuf, 128, &s->aes_encrypt_key) != 0) | |
896 | return -1; | |
897 | if (AES_set_decrypt_key(keybuf, 128, &s->aes_decrypt_key) != 0) | |
898 | return -1; | |
899 | #if 0 | |
900 | /* test */ | |
901 | { | |
902 | uint8_t in[16]; | |
903 | uint8_t out[16]; | |
904 | uint8_t tmp[16]; | |
905 | for(i=0;i<16;i++) | |
906 | in[i] = i; | |
907 | AES_encrypt(in, tmp, &s->aes_encrypt_key); | |
908 | AES_decrypt(tmp, out, &s->aes_decrypt_key); | |
909 | for(i = 0; i < 16; i++) | |
910 | printf(" %02x", tmp[i]); | |
911 | printf("\n"); | |
912 | for(i = 0; i < 16; i++) | |
913 | printf(" %02x", out[i]); | |
914 | printf("\n"); | |
915 | } | |
916 | #endif | |
917 | return 0; | |
918 | } | |
919 | ||
4c2e5f8f KW |
920 | /* We have no actual commit/abort logic for qcow2, but we need to write out any |
921 | * unwritten data if we reopen read-only. */ | |
21d82ac9 JC |
922 | static int qcow2_reopen_prepare(BDRVReopenState *state, |
923 | BlockReopenQueue *queue, Error **errp) | |
924 | { | |
4c2e5f8f KW |
925 | int ret; |
926 | ||
927 | if ((state->flags & BDRV_O_RDWR) == 0) { | |
928 | ret = bdrv_flush(state->bs); | |
929 | if (ret < 0) { | |
930 | return ret; | |
931 | } | |
932 | ||
933 | ret = qcow2_mark_clean(state->bs); | |
934 | if (ret < 0) { | |
935 | return ret; | |
936 | } | |
937 | } | |
938 | ||
21d82ac9 JC |
939 | return 0; |
940 | } | |
941 | ||
b6b8a333 | 942 | static int64_t coroutine_fn qcow2_co_get_block_status(BlockDriverState *bs, |
f8a2e5e3 | 943 | int64_t sector_num, int nb_sectors, int *pnum) |
585f8587 | 944 | { |
f8a2e5e3 | 945 | BDRVQcowState *s = bs->opaque; |
585f8587 | 946 | uint64_t cluster_offset; |
4bc74be9 PB |
947 | int index_in_cluster, ret; |
948 | int64_t status = 0; | |
585f8587 | 949 | |
095a9c58 | 950 | *pnum = nb_sectors; |
f8a2e5e3 | 951 | qemu_co_mutex_lock(&s->lock); |
1c46efaa | 952 | ret = qcow2_get_cluster_offset(bs, sector_num << 9, pnum, &cluster_offset); |
f8a2e5e3 | 953 | qemu_co_mutex_unlock(&s->lock); |
1c46efaa | 954 | if (ret < 0) { |
d663640c | 955 | return ret; |
1c46efaa | 956 | } |
095a9c58 | 957 | |
4bc74be9 PB |
958 | if (cluster_offset != 0 && ret != QCOW2_CLUSTER_COMPRESSED && |
959 | !s->crypt_method) { | |
960 | index_in_cluster = sector_num & (s->cluster_sectors - 1); | |
961 | cluster_offset |= (index_in_cluster << BDRV_SECTOR_BITS); | |
962 | status |= BDRV_BLOCK_OFFSET_VALID | cluster_offset; | |
963 | } | |
964 | if (ret == QCOW2_CLUSTER_ZERO) { | |
965 | status |= BDRV_BLOCK_ZERO; | |
966 | } else if (ret != QCOW2_CLUSTER_UNALLOCATED) { | |
967 | status |= BDRV_BLOCK_DATA; | |
968 | } | |
969 | return status; | |
585f8587 FB |
970 | } |
971 | ||
a9465922 | 972 | /* handle reading after the end of the backing file */ |
bd28f835 KW |
973 | int qcow2_backing_read1(BlockDriverState *bs, QEMUIOVector *qiov, |
974 | int64_t sector_num, int nb_sectors) | |
a9465922 FB |
975 | { |
976 | int n1; | |
977 | if ((sector_num + nb_sectors) <= bs->total_sectors) | |
978 | return nb_sectors; | |
979 | if (sector_num >= bs->total_sectors) | |
980 | n1 = 0; | |
981 | else | |
982 | n1 = bs->total_sectors - sector_num; | |
bd28f835 | 983 | |
3d9b4925 | 984 | qemu_iovec_memset(qiov, 512 * n1, 0, 512 * (nb_sectors - n1)); |
bd28f835 | 985 | |
a9465922 FB |
986 | return n1; |
987 | } | |
988 | ||
a968168c | 989 | static coroutine_fn int qcow2_co_readv(BlockDriverState *bs, int64_t sector_num, |
3fc48d09 | 990 | int remaining_sectors, QEMUIOVector *qiov) |
585f8587 | 991 | { |
585f8587 | 992 | BDRVQcowState *s = bs->opaque; |
a9465922 | 993 | int index_in_cluster, n1; |
68d100e9 | 994 | int ret; |
faf575c1 | 995 | int cur_nr_sectors; /* number of sectors in current iteration */ |
c2bdd990 | 996 | uint64_t cluster_offset = 0; |
3fc48d09 FZ |
997 | uint64_t bytes_done = 0; |
998 | QEMUIOVector hd_qiov; | |
999 | uint8_t *cluster_data = NULL; | |
585f8587 | 1000 | |
3fc48d09 FZ |
1001 | qemu_iovec_init(&hd_qiov, qiov->niov); |
1002 | ||
1003 | qemu_co_mutex_lock(&s->lock); | |
1004 | ||
1005 | while (remaining_sectors != 0) { | |
bd28f835 | 1006 | |
5ebaa27e | 1007 | /* prepare next request */ |
3fc48d09 | 1008 | cur_nr_sectors = remaining_sectors; |
5ebaa27e FZ |
1009 | if (s->crypt_method) { |
1010 | cur_nr_sectors = MIN(cur_nr_sectors, | |
1011 | QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors); | |
585f8587 | 1012 | } |
5ebaa27e | 1013 | |
3fc48d09 | 1014 | ret = qcow2_get_cluster_offset(bs, sector_num << 9, |
5ebaa27e | 1015 | &cur_nr_sectors, &cluster_offset); |
8af36488 | 1016 | if (ret < 0) { |
3fc48d09 | 1017 | goto fail; |
8af36488 | 1018 | } |
bd28f835 | 1019 | |
3fc48d09 | 1020 | index_in_cluster = sector_num & (s->cluster_sectors - 1); |
c87c0672 | 1021 | |
3fc48d09 | 1022 | qemu_iovec_reset(&hd_qiov); |
1b093c48 | 1023 | qemu_iovec_concat(&hd_qiov, qiov, bytes_done, |
5ebaa27e FZ |
1024 | cur_nr_sectors * 512); |
1025 | ||
68d000a3 KW |
1026 | switch (ret) { |
1027 | case QCOW2_CLUSTER_UNALLOCATED: | |
5ebaa27e FZ |
1028 | |
1029 | if (bs->backing_hd) { | |
1030 | /* read from the base image */ | |
3fc48d09 FZ |
1031 | n1 = qcow2_backing_read1(bs->backing_hd, &hd_qiov, |
1032 | sector_num, cur_nr_sectors); | |
5ebaa27e | 1033 | if (n1 > 0) { |
44deba5a KW |
1034 | QEMUIOVector local_qiov; |
1035 | ||
1036 | qemu_iovec_init(&local_qiov, hd_qiov.niov); | |
1037 | qemu_iovec_concat(&local_qiov, &hd_qiov, 0, | |
1038 | n1 * BDRV_SECTOR_SIZE); | |
1039 | ||
5ebaa27e FZ |
1040 | BLKDBG_EVENT(bs->file, BLKDBG_READ_BACKING_AIO); |
1041 | qemu_co_mutex_unlock(&s->lock); | |
3fc48d09 | 1042 | ret = bdrv_co_readv(bs->backing_hd, sector_num, |
44deba5a | 1043 | n1, &local_qiov); |
5ebaa27e | 1044 | qemu_co_mutex_lock(&s->lock); |
44deba5a KW |
1045 | |
1046 | qemu_iovec_destroy(&local_qiov); | |
1047 | ||
5ebaa27e | 1048 | if (ret < 0) { |
3fc48d09 | 1049 | goto fail; |
5ebaa27e FZ |
1050 | } |
1051 | } | |
1052 | } else { | |
1053 | /* Note: in this case, no need to wait */ | |
3d9b4925 | 1054 | qemu_iovec_memset(&hd_qiov, 0, 0, 512 * cur_nr_sectors); |
5ebaa27e | 1055 | } |
68d000a3 KW |
1056 | break; |
1057 | ||
6377af48 | 1058 | case QCOW2_CLUSTER_ZERO: |
3d9b4925 | 1059 | qemu_iovec_memset(&hd_qiov, 0, 0, 512 * cur_nr_sectors); |
6377af48 KW |
1060 | break; |
1061 | ||
68d000a3 | 1062 | case QCOW2_CLUSTER_COMPRESSED: |
5ebaa27e FZ |
1063 | /* add AIO support for compressed blocks ? */ |
1064 | ret = qcow2_decompress_cluster(bs, cluster_offset); | |
1065 | if (ret < 0) { | |
3fc48d09 | 1066 | goto fail; |
bd28f835 KW |
1067 | } |
1068 | ||
03396148 | 1069 | qemu_iovec_from_buf(&hd_qiov, 0, |
5ebaa27e | 1070 | s->cluster_cache + index_in_cluster * 512, |
faf575c1 | 1071 | 512 * cur_nr_sectors); |
68d000a3 KW |
1072 | break; |
1073 | ||
1074 | case QCOW2_CLUSTER_NORMAL: | |
5ebaa27e | 1075 | if ((cluster_offset & 511) != 0) { |
3fc48d09 FZ |
1076 | ret = -EIO; |
1077 | goto fail; | |
5ebaa27e | 1078 | } |
bd28f835 | 1079 | |
5ebaa27e FZ |
1080 | if (s->crypt_method) { |
1081 | /* | |
1082 | * For encrypted images, read everything into a temporary | |
1083 | * contiguous buffer on which the AES functions can work. | |
1084 | */ | |
3fc48d09 FZ |
1085 | if (!cluster_data) { |
1086 | cluster_data = | |
dea43a65 | 1087 | qemu_blockalign(bs, QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size); |
5ebaa27e FZ |
1088 | } |
1089 | ||
1090 | assert(cur_nr_sectors <= | |
1091 | QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors); | |
3fc48d09 FZ |
1092 | qemu_iovec_reset(&hd_qiov); |
1093 | qemu_iovec_add(&hd_qiov, cluster_data, | |
5ebaa27e FZ |
1094 | 512 * cur_nr_sectors); |
1095 | } | |
1096 | ||
1097 | BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO); | |
1098 | qemu_co_mutex_unlock(&s->lock); | |
1099 | ret = bdrv_co_readv(bs->file, | |
1100 | (cluster_offset >> 9) + index_in_cluster, | |
3fc48d09 | 1101 | cur_nr_sectors, &hd_qiov); |
5ebaa27e FZ |
1102 | qemu_co_mutex_lock(&s->lock); |
1103 | if (ret < 0) { | |
3fc48d09 | 1104 | goto fail; |
5ebaa27e FZ |
1105 | } |
1106 | if (s->crypt_method) { | |
3fc48d09 FZ |
1107 | qcow2_encrypt_sectors(s, sector_num, cluster_data, |
1108 | cluster_data, cur_nr_sectors, 0, &s->aes_decrypt_key); | |
03396148 MT |
1109 | qemu_iovec_from_buf(qiov, bytes_done, |
1110 | cluster_data, 512 * cur_nr_sectors); | |
5ebaa27e | 1111 | } |
68d000a3 KW |
1112 | break; |
1113 | ||
1114 | default: | |
1115 | g_assert_not_reached(); | |
1116 | ret = -EIO; | |
1117 | goto fail; | |
faf575c1 | 1118 | } |
f141eafe | 1119 | |
3fc48d09 FZ |
1120 | remaining_sectors -= cur_nr_sectors; |
1121 | sector_num += cur_nr_sectors; | |
1122 | bytes_done += cur_nr_sectors * 512; | |
5ebaa27e | 1123 | } |
3fc48d09 | 1124 | ret = 0; |
faf575c1 | 1125 | |
3fc48d09 | 1126 | fail: |
68d100e9 | 1127 | qemu_co_mutex_unlock(&s->lock); |
42496d62 | 1128 | |
3fc48d09 | 1129 | qemu_iovec_destroy(&hd_qiov); |
dea43a65 | 1130 | qemu_vfree(cluster_data); |
68d100e9 KW |
1131 | |
1132 | return ret; | |
585f8587 FB |
1133 | } |
1134 | ||
a968168c | 1135 | static coroutine_fn int qcow2_co_writev(BlockDriverState *bs, |
3fc48d09 FZ |
1136 | int64_t sector_num, |
1137 | int remaining_sectors, | |
1138 | QEMUIOVector *qiov) | |
585f8587 | 1139 | { |
585f8587 | 1140 | BDRVQcowState *s = bs->opaque; |
585f8587 | 1141 | int index_in_cluster; |
68d100e9 | 1142 | int ret; |
faf575c1 | 1143 | int cur_nr_sectors; /* number of sectors in current iteration */ |
c2bdd990 | 1144 | uint64_t cluster_offset; |
3fc48d09 FZ |
1145 | QEMUIOVector hd_qiov; |
1146 | uint64_t bytes_done = 0; | |
1147 | uint8_t *cluster_data = NULL; | |
8d2497c3 | 1148 | QCowL2Meta *l2meta = NULL; |
c2271403 | 1149 | |
3cce16f4 KW |
1150 | trace_qcow2_writev_start_req(qemu_coroutine_self(), sector_num, |
1151 | remaining_sectors); | |
1152 | ||
3fc48d09 FZ |
1153 | qemu_iovec_init(&hd_qiov, qiov->niov); |
1154 | ||
1155 | s->cluster_cache_offset = -1; /* disable compressed cache */ | |
3b46e624 | 1156 | |
3fc48d09 FZ |
1157 | qemu_co_mutex_lock(&s->lock); |
1158 | ||
1159 | while (remaining_sectors != 0) { | |
1160 | ||
f50f88b9 | 1161 | l2meta = NULL; |
cf5c1a23 | 1162 | |
3cce16f4 | 1163 | trace_qcow2_writev_start_part(qemu_coroutine_self()); |
3fc48d09 | 1164 | index_in_cluster = sector_num & (s->cluster_sectors - 1); |
16f0587e | 1165 | cur_nr_sectors = remaining_sectors; |
5ebaa27e | 1166 | if (s->crypt_method && |
16f0587e HT |
1167 | cur_nr_sectors > |
1168 | QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors - index_in_cluster) { | |
1169 | cur_nr_sectors = | |
1170 | QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors - index_in_cluster; | |
5ebaa27e | 1171 | } |
095a9c58 | 1172 | |
3fc48d09 | 1173 | ret = qcow2_alloc_cluster_offset(bs, sector_num << 9, |
16f0587e | 1174 | &cur_nr_sectors, &cluster_offset, &l2meta); |
5ebaa27e | 1175 | if (ret < 0) { |
3fc48d09 | 1176 | goto fail; |
5ebaa27e | 1177 | } |
148da7ea | 1178 | |
5ebaa27e | 1179 | assert((cluster_offset & 511) == 0); |
148da7ea | 1180 | |
3fc48d09 | 1181 | qemu_iovec_reset(&hd_qiov); |
1b093c48 | 1182 | qemu_iovec_concat(&hd_qiov, qiov, bytes_done, |
5ebaa27e | 1183 | cur_nr_sectors * 512); |
6f5f060b | 1184 | |
5ebaa27e | 1185 | if (s->crypt_method) { |
3fc48d09 | 1186 | if (!cluster_data) { |
dea43a65 | 1187 | cluster_data = qemu_blockalign(bs, QCOW_MAX_CRYPT_CLUSTERS * |
5ebaa27e FZ |
1188 | s->cluster_size); |
1189 | } | |
6f5f060b | 1190 | |
3fc48d09 | 1191 | assert(hd_qiov.size <= |
5ebaa27e | 1192 | QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size); |
d5e6b161 | 1193 | qemu_iovec_to_buf(&hd_qiov, 0, cluster_data, hd_qiov.size); |
6f5f060b | 1194 | |
3fc48d09 FZ |
1195 | qcow2_encrypt_sectors(s, sector_num, cluster_data, |
1196 | cluster_data, cur_nr_sectors, 1, &s->aes_encrypt_key); | |
6f5f060b | 1197 | |
3fc48d09 FZ |
1198 | qemu_iovec_reset(&hd_qiov); |
1199 | qemu_iovec_add(&hd_qiov, cluster_data, | |
5ebaa27e FZ |
1200 | cur_nr_sectors * 512); |
1201 | } | |
6f5f060b | 1202 | |
231bb267 | 1203 | ret = qcow2_pre_write_overlap_check(bs, 0, |
cf93980e HR |
1204 | cluster_offset + index_in_cluster * BDRV_SECTOR_SIZE, |
1205 | cur_nr_sectors * BDRV_SECTOR_SIZE); | |
1206 | if (ret < 0) { | |
1207 | goto fail; | |
1208 | } | |
1209 | ||
5ebaa27e | 1210 | qemu_co_mutex_unlock(&s->lock); |
67a7a0eb | 1211 | BLKDBG_EVENT(bs->file, BLKDBG_WRITE_AIO); |
3cce16f4 KW |
1212 | trace_qcow2_writev_data(qemu_coroutine_self(), |
1213 | (cluster_offset >> 9) + index_in_cluster); | |
5ebaa27e FZ |
1214 | ret = bdrv_co_writev(bs->file, |
1215 | (cluster_offset >> 9) + index_in_cluster, | |
3fc48d09 | 1216 | cur_nr_sectors, &hd_qiov); |
5ebaa27e FZ |
1217 | qemu_co_mutex_lock(&s->lock); |
1218 | if (ret < 0) { | |
3fc48d09 | 1219 | goto fail; |
5ebaa27e | 1220 | } |
f141eafe | 1221 | |
88c6588c KW |
1222 | while (l2meta != NULL) { |
1223 | QCowL2Meta *next; | |
1224 | ||
f50f88b9 KW |
1225 | ret = qcow2_alloc_cluster_link_l2(bs, l2meta); |
1226 | if (ret < 0) { | |
1227 | goto fail; | |
1228 | } | |
faf575c1 | 1229 | |
4e95314e KW |
1230 | /* Take the request off the list of running requests */ |
1231 | if (l2meta->nb_clusters != 0) { | |
1232 | QLIST_REMOVE(l2meta, next_in_flight); | |
1233 | } | |
1234 | ||
4e95314e | 1235 | qemu_co_queue_restart_all(&l2meta->dependent_requests); |
4e95314e | 1236 | |
88c6588c | 1237 | next = l2meta->next; |
f50f88b9 | 1238 | g_free(l2meta); |
88c6588c | 1239 | l2meta = next; |
f50f88b9 | 1240 | } |
0fa9131a | 1241 | |
3fc48d09 FZ |
1242 | remaining_sectors -= cur_nr_sectors; |
1243 | sector_num += cur_nr_sectors; | |
1244 | bytes_done += cur_nr_sectors * 512; | |
3cce16f4 | 1245 | trace_qcow2_writev_done_part(qemu_coroutine_self(), cur_nr_sectors); |
5ebaa27e | 1246 | } |
3fc48d09 | 1247 | ret = 0; |
faf575c1 | 1248 | |
3fc48d09 | 1249 | fail: |
4e95314e KW |
1250 | qemu_co_mutex_unlock(&s->lock); |
1251 | ||
88c6588c KW |
1252 | while (l2meta != NULL) { |
1253 | QCowL2Meta *next; | |
1254 | ||
4e95314e KW |
1255 | if (l2meta->nb_clusters != 0) { |
1256 | QLIST_REMOVE(l2meta, next_in_flight); | |
1257 | } | |
1258 | qemu_co_queue_restart_all(&l2meta->dependent_requests); | |
88c6588c KW |
1259 | |
1260 | next = l2meta->next; | |
cf5c1a23 | 1261 | g_free(l2meta); |
88c6588c | 1262 | l2meta = next; |
cf5c1a23 | 1263 | } |
0fa9131a | 1264 | |
3fc48d09 | 1265 | qemu_iovec_destroy(&hd_qiov); |
dea43a65 | 1266 | qemu_vfree(cluster_data); |
3cce16f4 | 1267 | trace_qcow2_writev_done_req(qemu_coroutine_self(), ret); |
42496d62 | 1268 | |
68d100e9 | 1269 | return ret; |
585f8587 FB |
1270 | } |
1271 | ||
7c80ab3f | 1272 | static void qcow2_close(BlockDriverState *bs) |
585f8587 FB |
1273 | { |
1274 | BDRVQcowState *s = bs->opaque; | |
7267c094 | 1275 | g_free(s->l1_table); |
cf93980e HR |
1276 | /* else pre-write overlap checks in cache_destroy may crash */ |
1277 | s->l1_table = NULL; | |
29c1a730 | 1278 | |
27eb6c09 KW |
1279 | if (!(bs->open_flags & BDRV_O_INCOMING)) { |
1280 | qcow2_cache_flush(bs, s->l2_table_cache); | |
1281 | qcow2_cache_flush(bs, s->refcount_block_cache); | |
29c1a730 | 1282 | |
27eb6c09 KW |
1283 | qcow2_mark_clean(bs); |
1284 | } | |
c61d0004 | 1285 | |
29c1a730 KW |
1286 | qcow2_cache_destroy(bs, s->l2_table_cache); |
1287 | qcow2_cache_destroy(bs, s->refcount_block_cache); | |
1288 | ||
6744cbab | 1289 | g_free(s->unknown_header_fields); |
75bab85c | 1290 | cleanup_unknown_header_ext(bs); |
6744cbab | 1291 | |
7267c094 | 1292 | g_free(s->cluster_cache); |
dea43a65 | 1293 | qemu_vfree(s->cluster_data); |
ed6ccf0f | 1294 | qcow2_refcount_close(bs); |
28c1202b | 1295 | qcow2_free_snapshots(bs); |
585f8587 FB |
1296 | } |
1297 | ||
5a8a30db | 1298 | static void qcow2_invalidate_cache(BlockDriverState *bs, Error **errp) |
06d9260f AL |
1299 | { |
1300 | BDRVQcowState *s = bs->opaque; | |
1301 | int flags = s->flags; | |
1302 | AES_KEY aes_encrypt_key; | |
1303 | AES_KEY aes_decrypt_key; | |
1304 | uint32_t crypt_method = 0; | |
acdfb480 | 1305 | QDict *options; |
5a8a30db KW |
1306 | Error *local_err = NULL; |
1307 | int ret; | |
06d9260f AL |
1308 | |
1309 | /* | |
1310 | * Backing files are read-only which makes all of their metadata immutable, | |
1311 | * that means we don't have to worry about reopening them here. | |
1312 | */ | |
1313 | ||
1314 | if (s->crypt_method) { | |
1315 | crypt_method = s->crypt_method; | |
1316 | memcpy(&aes_encrypt_key, &s->aes_encrypt_key, sizeof(aes_encrypt_key)); | |
1317 | memcpy(&aes_decrypt_key, &s->aes_decrypt_key, sizeof(aes_decrypt_key)); | |
1318 | } | |
1319 | ||
1320 | qcow2_close(bs); | |
1321 | ||
5a8a30db KW |
1322 | bdrv_invalidate_cache(bs->file, &local_err); |
1323 | if (local_err) { | |
1324 | error_propagate(errp, local_err); | |
1325 | return; | |
1326 | } | |
3456a8d1 | 1327 | |
06d9260f | 1328 | memset(s, 0, sizeof(BDRVQcowState)); |
d475e5ac | 1329 | options = qdict_clone_shallow(bs->options); |
5a8a30db KW |
1330 | |
1331 | ret = qcow2_open(bs, options, flags, &local_err); | |
a1904e48 | 1332 | QDECREF(options); |
5a8a30db KW |
1333 | if (local_err) { |
1334 | error_setg(errp, "Could not reopen qcow2 layer: %s", | |
1335 | error_get_pretty(local_err)); | |
1336 | error_free(local_err); | |
1337 | return; | |
1338 | } else if (ret < 0) { | |
1339 | error_setg_errno(errp, -ret, "Could not reopen qcow2 layer"); | |
1340 | return; | |
1341 | } | |
acdfb480 | 1342 | |
06d9260f AL |
1343 | if (crypt_method) { |
1344 | s->crypt_method = crypt_method; | |
1345 | memcpy(&s->aes_encrypt_key, &aes_encrypt_key, sizeof(aes_encrypt_key)); | |
1346 | memcpy(&s->aes_decrypt_key, &aes_decrypt_key, sizeof(aes_decrypt_key)); | |
1347 | } | |
1348 | } | |
1349 | ||
e24e49e6 KW |
1350 | static size_t header_ext_add(char *buf, uint32_t magic, const void *s, |
1351 | size_t len, size_t buflen) | |
1352 | { | |
1353 | QCowExtension *ext_backing_fmt = (QCowExtension*) buf; | |
1354 | size_t ext_len = sizeof(QCowExtension) + ((len + 7) & ~7); | |
1355 | ||
1356 | if (buflen < ext_len) { | |
1357 | return -ENOSPC; | |
1358 | } | |
1359 | ||
1360 | *ext_backing_fmt = (QCowExtension) { | |
1361 | .magic = cpu_to_be32(magic), | |
1362 | .len = cpu_to_be32(len), | |
1363 | }; | |
1364 | memcpy(buf + sizeof(QCowExtension), s, len); | |
1365 | ||
1366 | return ext_len; | |
1367 | } | |
1368 | ||
756e6736 | 1369 | /* |
e24e49e6 KW |
1370 | * Updates the qcow2 header, including the variable length parts of it, i.e. |
1371 | * the backing file name and all extensions. qcow2 was not designed to allow | |
1372 | * such changes, so if we run out of space (we can only use the first cluster) | |
1373 | * this function may fail. | |
756e6736 KW |
1374 | * |
1375 | * Returns 0 on success, -errno in error cases. | |
1376 | */ | |
e24e49e6 | 1377 | int qcow2_update_header(BlockDriverState *bs) |
756e6736 | 1378 | { |
756e6736 | 1379 | BDRVQcowState *s = bs->opaque; |
e24e49e6 KW |
1380 | QCowHeader *header; |
1381 | char *buf; | |
1382 | size_t buflen = s->cluster_size; | |
756e6736 | 1383 | int ret; |
e24e49e6 KW |
1384 | uint64_t total_size; |
1385 | uint32_t refcount_table_clusters; | |
6744cbab | 1386 | size_t header_length; |
75bab85c | 1387 | Qcow2UnknownHeaderExtension *uext; |
756e6736 | 1388 | |
e24e49e6 | 1389 | buf = qemu_blockalign(bs, buflen); |
756e6736 | 1390 | |
e24e49e6 KW |
1391 | /* Header structure */ |
1392 | header = (QCowHeader*) buf; | |
756e6736 | 1393 | |
e24e49e6 KW |
1394 | if (buflen < sizeof(*header)) { |
1395 | ret = -ENOSPC; | |
1396 | goto fail; | |
756e6736 KW |
1397 | } |
1398 | ||
6744cbab | 1399 | header_length = sizeof(*header) + s->unknown_header_fields_size; |
e24e49e6 KW |
1400 | total_size = bs->total_sectors * BDRV_SECTOR_SIZE; |
1401 | refcount_table_clusters = s->refcount_table_size >> (s->cluster_bits - 3); | |
1402 | ||
1403 | *header = (QCowHeader) { | |
6744cbab | 1404 | /* Version 2 fields */ |
e24e49e6 | 1405 | .magic = cpu_to_be32(QCOW_MAGIC), |
6744cbab | 1406 | .version = cpu_to_be32(s->qcow_version), |
e24e49e6 KW |
1407 | .backing_file_offset = 0, |
1408 | .backing_file_size = 0, | |
1409 | .cluster_bits = cpu_to_be32(s->cluster_bits), | |
1410 | .size = cpu_to_be64(total_size), | |
1411 | .crypt_method = cpu_to_be32(s->crypt_method_header), | |
1412 | .l1_size = cpu_to_be32(s->l1_size), | |
1413 | .l1_table_offset = cpu_to_be64(s->l1_table_offset), | |
1414 | .refcount_table_offset = cpu_to_be64(s->refcount_table_offset), | |
1415 | .refcount_table_clusters = cpu_to_be32(refcount_table_clusters), | |
1416 | .nb_snapshots = cpu_to_be32(s->nb_snapshots), | |
1417 | .snapshots_offset = cpu_to_be64(s->snapshots_offset), | |
6744cbab KW |
1418 | |
1419 | /* Version 3 fields */ | |
1420 | .incompatible_features = cpu_to_be64(s->incompatible_features), | |
1421 | .compatible_features = cpu_to_be64(s->compatible_features), | |
1422 | .autoclear_features = cpu_to_be64(s->autoclear_features), | |
b6481f37 | 1423 | .refcount_order = cpu_to_be32(s->refcount_order), |
6744cbab | 1424 | .header_length = cpu_to_be32(header_length), |
e24e49e6 | 1425 | }; |
756e6736 | 1426 | |
6744cbab KW |
1427 | /* For older versions, write a shorter header */ |
1428 | switch (s->qcow_version) { | |
1429 | case 2: | |
1430 | ret = offsetof(QCowHeader, incompatible_features); | |
1431 | break; | |
1432 | case 3: | |
1433 | ret = sizeof(*header); | |
1434 | break; | |
1435 | default: | |
b6c14762 JM |
1436 | ret = -EINVAL; |
1437 | goto fail; | |
6744cbab KW |
1438 | } |
1439 | ||
1440 | buf += ret; | |
1441 | buflen -= ret; | |
1442 | memset(buf, 0, buflen); | |
1443 | ||
1444 | /* Preserve any unknown field in the header */ | |
1445 | if (s->unknown_header_fields_size) { | |
1446 | if (buflen < s->unknown_header_fields_size) { | |
1447 | ret = -ENOSPC; | |
1448 | goto fail; | |
1449 | } | |
1450 | ||
1451 | memcpy(buf, s->unknown_header_fields, s->unknown_header_fields_size); | |
1452 | buf += s->unknown_header_fields_size; | |
1453 | buflen -= s->unknown_header_fields_size; | |
1454 | } | |
756e6736 | 1455 | |
e24e49e6 KW |
1456 | /* Backing file format header extension */ |
1457 | if (*bs->backing_format) { | |
1458 | ret = header_ext_add(buf, QCOW2_EXT_MAGIC_BACKING_FORMAT, | |
1459 | bs->backing_format, strlen(bs->backing_format), | |
1460 | buflen); | |
1461 | if (ret < 0) { | |
1462 | goto fail; | |
756e6736 KW |
1463 | } |
1464 | ||
e24e49e6 KW |
1465 | buf += ret; |
1466 | buflen -= ret; | |
756e6736 KW |
1467 | } |
1468 | ||
cfcc4c62 KW |
1469 | /* Feature table */ |
1470 | Qcow2Feature features[] = { | |
c61d0004 SH |
1471 | { |
1472 | .type = QCOW2_FEAT_TYPE_INCOMPATIBLE, | |
1473 | .bit = QCOW2_INCOMPAT_DIRTY_BITNR, | |
1474 | .name = "dirty bit", | |
1475 | }, | |
69c98726 HR |
1476 | { |
1477 | .type = QCOW2_FEAT_TYPE_INCOMPATIBLE, | |
1478 | .bit = QCOW2_INCOMPAT_CORRUPT_BITNR, | |
1479 | .name = "corrupt bit", | |
1480 | }, | |
bfe8043e SH |
1481 | { |
1482 | .type = QCOW2_FEAT_TYPE_COMPATIBLE, | |
1483 | .bit = QCOW2_COMPAT_LAZY_REFCOUNTS_BITNR, | |
1484 | .name = "lazy refcounts", | |
1485 | }, | |
cfcc4c62 KW |
1486 | }; |
1487 | ||
1488 | ret = header_ext_add(buf, QCOW2_EXT_MAGIC_FEATURE_TABLE, | |
1489 | features, sizeof(features), buflen); | |
1490 | if (ret < 0) { | |
1491 | goto fail; | |
1492 | } | |
1493 | buf += ret; | |
1494 | buflen -= ret; | |
1495 | ||
75bab85c KW |
1496 | /* Keep unknown header extensions */ |
1497 | QLIST_FOREACH(uext, &s->unknown_header_ext, next) { | |
1498 | ret = header_ext_add(buf, uext->magic, uext->data, uext->len, buflen); | |
1499 | if (ret < 0) { | |
1500 | goto fail; | |
1501 | } | |
1502 | ||
1503 | buf += ret; | |
1504 | buflen -= ret; | |
1505 | } | |
1506 | ||
e24e49e6 KW |
1507 | /* End of header extensions */ |
1508 | ret = header_ext_add(buf, QCOW2_EXT_MAGIC_END, NULL, 0, buflen); | |
756e6736 KW |
1509 | if (ret < 0) { |
1510 | goto fail; | |
1511 | } | |
1512 | ||
e24e49e6 KW |
1513 | buf += ret; |
1514 | buflen -= ret; | |
756e6736 | 1515 | |
e24e49e6 KW |
1516 | /* Backing file name */ |
1517 | if (*bs->backing_file) { | |
1518 | size_t backing_file_len = strlen(bs->backing_file); | |
1519 | ||
1520 | if (buflen < backing_file_len) { | |
1521 | ret = -ENOSPC; | |
1522 | goto fail; | |
1523 | } | |
1524 | ||
00ea1881 | 1525 | /* Using strncpy is ok here, since buf is not NUL-terminated. */ |
e24e49e6 KW |
1526 | strncpy(buf, bs->backing_file, buflen); |
1527 | ||
1528 | header->backing_file_offset = cpu_to_be64(buf - ((char*) header)); | |
1529 | header->backing_file_size = cpu_to_be32(backing_file_len); | |
756e6736 KW |
1530 | } |
1531 | ||
e24e49e6 KW |
1532 | /* Write the new header */ |
1533 | ret = bdrv_pwrite(bs->file, 0, header, s->cluster_size); | |
756e6736 KW |
1534 | if (ret < 0) { |
1535 | goto fail; | |
1536 | } | |
1537 | ||
1538 | ret = 0; | |
1539 | fail: | |
e24e49e6 | 1540 | qemu_vfree(header); |
756e6736 KW |
1541 | return ret; |
1542 | } | |
1543 | ||
1544 | static int qcow2_change_backing_file(BlockDriverState *bs, | |
1545 | const char *backing_file, const char *backing_fmt) | |
1546 | { | |
e24e49e6 KW |
1547 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: ""); |
1548 | pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: ""); | |
1549 | ||
1550 | return qcow2_update_header(bs); | |
756e6736 KW |
1551 | } |
1552 | ||
a35e1c17 KW |
1553 | static int preallocate(BlockDriverState *bs) |
1554 | { | |
a35e1c17 KW |
1555 | uint64_t nb_sectors; |
1556 | uint64_t offset; | |
060bee89 | 1557 | uint64_t host_offset = 0; |
a35e1c17 | 1558 | int num; |
148da7ea | 1559 | int ret; |
f50f88b9 | 1560 | QCowL2Meta *meta; |
a35e1c17 | 1561 | |
7c2bbf4a | 1562 | nb_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
a35e1c17 KW |
1563 | offset = 0; |
1564 | ||
1565 | while (nb_sectors) { | |
7c2bbf4a | 1566 | num = MIN(nb_sectors, INT_MAX >> BDRV_SECTOR_BITS); |
16f0587e | 1567 | ret = qcow2_alloc_cluster_offset(bs, offset, &num, |
060bee89 | 1568 | &host_offset, &meta); |
148da7ea | 1569 | if (ret < 0) { |
19dbcbf7 | 1570 | return ret; |
a35e1c17 KW |
1571 | } |
1572 | ||
c792707f SH |
1573 | while (meta) { |
1574 | QCowL2Meta *next = meta->next; | |
1575 | ||
7c2bbf4a HT |
1576 | ret = qcow2_alloc_cluster_link_l2(bs, meta); |
1577 | if (ret < 0) { | |
1578 | qcow2_free_any_clusters(bs, meta->alloc_offset, | |
1579 | meta->nb_clusters, QCOW2_DISCARD_NEVER); | |
1580 | return ret; | |
1581 | } | |
1582 | ||
1583 | /* There are no dependent requests, but we need to remove our | |
1584 | * request from the list of in-flight requests */ | |
4e95314e | 1585 | QLIST_REMOVE(meta, next_in_flight); |
c792707f SH |
1586 | |
1587 | g_free(meta); | |
1588 | meta = next; | |
f50f88b9 | 1589 | } |
f214978a | 1590 | |
a35e1c17 KW |
1591 | /* TODO Preallocate data if requested */ |
1592 | ||
1593 | nb_sectors -= num; | |
7c2bbf4a | 1594 | offset += num << BDRV_SECTOR_BITS; |
a35e1c17 KW |
1595 | } |
1596 | ||
1597 | /* | |
1598 | * It is expected that the image file is large enough to actually contain | |
1599 | * all of the allocated clusters (otherwise we get failing reads after | |
1600 | * EOF). Extend the image to the last allocated sector. | |
1601 | */ | |
060bee89 | 1602 | if (host_offset != 0) { |
7c2bbf4a HT |
1603 | uint8_t buf[BDRV_SECTOR_SIZE]; |
1604 | memset(buf, 0, BDRV_SECTOR_SIZE); | |
1605 | ret = bdrv_write(bs->file, (host_offset >> BDRV_SECTOR_BITS) + num - 1, | |
1606 | buf, 1); | |
19dbcbf7 KW |
1607 | if (ret < 0) { |
1608 | return ret; | |
1609 | } | |
a35e1c17 KW |
1610 | } |
1611 | ||
1612 | return 0; | |
1613 | } | |
1614 | ||
7c80ab3f JS |
1615 | static int qcow2_create2(const char *filename, int64_t total_size, |
1616 | const char *backing_file, const char *backing_format, | |
1617 | int flags, size_t cluster_size, int prealloc, | |
1bd0e2d1 | 1618 | QemuOpts *opts, int version, |
3ef6c40a | 1619 | Error **errp) |
a9420734 | 1620 | { |
9b2260cb | 1621 | /* Calculate cluster_bits */ |
a9420734 KW |
1622 | int cluster_bits; |
1623 | cluster_bits = ffs(cluster_size) - 1; | |
1624 | if (cluster_bits < MIN_CLUSTER_BITS || cluster_bits > MAX_CLUSTER_BITS || | |
1625 | (1 << cluster_bits) != cluster_size) | |
1626 | { | |
3ef6c40a HR |
1627 | error_setg(errp, "Cluster size must be a power of two between %d and " |
1628 | "%dk", 1 << MIN_CLUSTER_BITS, 1 << (MAX_CLUSTER_BITS - 10)); | |
a9420734 KW |
1629 | return -EINVAL; |
1630 | } | |
1631 | ||
1632 | /* | |
1633 | * Open the image file and write a minimal qcow2 header. | |
1634 | * | |
1635 | * We keep things simple and start with a zero-sized image. We also | |
1636 | * do without refcount blocks or a L1 table for now. We'll fix the | |
1637 | * inconsistency later. | |
1638 | * | |
1639 | * We do need a refcount table because growing the refcount table means | |
1640 | * allocating two new refcount blocks - the seconds of which would be at | |
1641 | * 2 GB for 64k clusters, and we don't want to have a 2 GB initial file | |
1642 | * size for any qcow2 image. | |
1643 | */ | |
1644 | BlockDriverState* bs; | |
f8413b3c | 1645 | QCowHeader *header; |
b106ad91 | 1646 | uint64_t* refcount_table; |
3ef6c40a | 1647 | Error *local_err = NULL; |
a9420734 KW |
1648 | int ret; |
1649 | ||
c282e1fd | 1650 | ret = bdrv_create_file(filename, opts, &local_err); |
a9420734 | 1651 | if (ret < 0) { |
3ef6c40a | 1652 | error_propagate(errp, local_err); |
a9420734 KW |
1653 | return ret; |
1654 | } | |
1655 | ||
2e40134b HR |
1656 | bs = NULL; |
1657 | ret = bdrv_open(&bs, filename, NULL, NULL, BDRV_O_RDWR | BDRV_O_PROTOCOL, | |
1658 | NULL, &local_err); | |
a9420734 | 1659 | if (ret < 0) { |
3ef6c40a | 1660 | error_propagate(errp, local_err); |
a9420734 KW |
1661 | return ret; |
1662 | } | |
1663 | ||
1664 | /* Write the header */ | |
f8413b3c KW |
1665 | QEMU_BUILD_BUG_ON((1 << MIN_CLUSTER_BITS) < sizeof(*header)); |
1666 | header = g_malloc0(cluster_size); | |
1667 | *header = (QCowHeader) { | |
1668 | .magic = cpu_to_be32(QCOW_MAGIC), | |
1669 | .version = cpu_to_be32(version), | |
1670 | .cluster_bits = cpu_to_be32(cluster_bits), | |
1671 | .size = cpu_to_be64(0), | |
1672 | .l1_table_offset = cpu_to_be64(0), | |
1673 | .l1_size = cpu_to_be32(0), | |
1674 | .refcount_table_offset = cpu_to_be64(cluster_size), | |
1675 | .refcount_table_clusters = cpu_to_be32(1), | |
1676 | .refcount_order = cpu_to_be32(3 + REFCOUNT_SHIFT), | |
1677 | .header_length = cpu_to_be32(sizeof(*header)), | |
1678 | }; | |
a9420734 KW |
1679 | |
1680 | if (flags & BLOCK_FLAG_ENCRYPT) { | |
f8413b3c | 1681 | header->crypt_method = cpu_to_be32(QCOW_CRYPT_AES); |
a9420734 | 1682 | } else { |
f8413b3c | 1683 | header->crypt_method = cpu_to_be32(QCOW_CRYPT_NONE); |
a9420734 KW |
1684 | } |
1685 | ||
bfe8043e | 1686 | if (flags & BLOCK_FLAG_LAZY_REFCOUNTS) { |
f8413b3c | 1687 | header->compatible_features |= |
bfe8043e SH |
1688 | cpu_to_be64(QCOW2_COMPAT_LAZY_REFCOUNTS); |
1689 | } | |
1690 | ||
f8413b3c KW |
1691 | ret = bdrv_pwrite(bs, 0, header, cluster_size); |
1692 | g_free(header); | |
a9420734 | 1693 | if (ret < 0) { |
3ef6c40a | 1694 | error_setg_errno(errp, -ret, "Could not write qcow2 header"); |
a9420734 KW |
1695 | goto out; |
1696 | } | |
1697 | ||
b106ad91 KW |
1698 | /* Write a refcount table with one refcount block */ |
1699 | refcount_table = g_malloc0(2 * cluster_size); | |
1700 | refcount_table[0] = cpu_to_be64(2 * cluster_size); | |
1701 | ret = bdrv_pwrite(bs, cluster_size, refcount_table, 2 * cluster_size); | |
7267c094 | 1702 | g_free(refcount_table); |
a9420734 KW |
1703 | |
1704 | if (ret < 0) { | |
3ef6c40a | 1705 | error_setg_errno(errp, -ret, "Could not write refcount table"); |
a9420734 KW |
1706 | goto out; |
1707 | } | |
1708 | ||
f67503e5 HR |
1709 | bdrv_unref(bs); |
1710 | bs = NULL; | |
a9420734 KW |
1711 | |
1712 | /* | |
1713 | * And now open the image and make it consistent first (i.e. increase the | |
1714 | * refcount of the cluster that is occupied by the header and the refcount | |
1715 | * table) | |
1716 | */ | |
1717 | BlockDriver* drv = bdrv_find_format("qcow2"); | |
1718 | assert(drv != NULL); | |
ddf5636d | 1719 | ret = bdrv_open(&bs, filename, NULL, NULL, |
3ef6c40a | 1720 | BDRV_O_RDWR | BDRV_O_CACHE_WB | BDRV_O_NO_FLUSH, drv, &local_err); |
a9420734 | 1721 | if (ret < 0) { |
3ef6c40a | 1722 | error_propagate(errp, local_err); |
a9420734 KW |
1723 | goto out; |
1724 | } | |
1725 | ||
b106ad91 | 1726 | ret = qcow2_alloc_clusters(bs, 3 * cluster_size); |
a9420734 | 1727 | if (ret < 0) { |
3ef6c40a HR |
1728 | error_setg_errno(errp, -ret, "Could not allocate clusters for qcow2 " |
1729 | "header and refcount table"); | |
a9420734 KW |
1730 | goto out; |
1731 | ||
1732 | } else if (ret != 0) { | |
1733 | error_report("Huh, first cluster in empty image is already in use?"); | |
1734 | abort(); | |
1735 | } | |
1736 | ||
1737 | /* Okay, now that we have a valid image, let's give it the right size */ | |
1738 | ret = bdrv_truncate(bs, total_size * BDRV_SECTOR_SIZE); | |
1739 | if (ret < 0) { | |
3ef6c40a | 1740 | error_setg_errno(errp, -ret, "Could not resize image"); |
a9420734 KW |
1741 | goto out; |
1742 | } | |
1743 | ||
1744 | /* Want a backing file? There you go.*/ | |
1745 | if (backing_file) { | |
1746 | ret = bdrv_change_backing_file(bs, backing_file, backing_format); | |
1747 | if (ret < 0) { | |
3ef6c40a HR |
1748 | error_setg_errno(errp, -ret, "Could not assign backing file '%s' " |
1749 | "with format '%s'", backing_file, backing_format); | |
a9420734 KW |
1750 | goto out; |
1751 | } | |
1752 | } | |
1753 | ||
1754 | /* And if we're supposed to preallocate metadata, do that now */ | |
1755 | if (prealloc) { | |
15552c4a ZYW |
1756 | BDRVQcowState *s = bs->opaque; |
1757 | qemu_co_mutex_lock(&s->lock); | |
a9420734 | 1758 | ret = preallocate(bs); |
15552c4a | 1759 | qemu_co_mutex_unlock(&s->lock); |
a9420734 | 1760 | if (ret < 0) { |
3ef6c40a | 1761 | error_setg_errno(errp, -ret, "Could not preallocate metadata"); |
a9420734 KW |
1762 | goto out; |
1763 | } | |
1764 | } | |
1765 | ||
f67503e5 HR |
1766 | bdrv_unref(bs); |
1767 | bs = NULL; | |
ba2ab2f2 HR |
1768 | |
1769 | /* Reopen the image without BDRV_O_NO_FLUSH to flush it before returning */ | |
ddf5636d | 1770 | ret = bdrv_open(&bs, filename, NULL, NULL, |
c9fbb99d KW |
1771 | BDRV_O_RDWR | BDRV_O_CACHE_WB | BDRV_O_NO_BACKING, |
1772 | drv, &local_err); | |
84d18f06 | 1773 | if (local_err) { |
ba2ab2f2 HR |
1774 | error_propagate(errp, local_err); |
1775 | goto out; | |
1776 | } | |
1777 | ||
a9420734 KW |
1778 | ret = 0; |
1779 | out: | |
f67503e5 HR |
1780 | if (bs) { |
1781 | bdrv_unref(bs); | |
1782 | } | |
a9420734 KW |
1783 | return ret; |
1784 | } | |
de5f3f40 | 1785 | |
1bd0e2d1 | 1786 | static int qcow2_create(const char *filename, QemuOpts *opts, Error **errp) |
de5f3f40 | 1787 | { |
1bd0e2d1 CL |
1788 | char *backing_file = NULL; |
1789 | char *backing_fmt = NULL; | |
1790 | char *buf = NULL; | |
de5f3f40 KW |
1791 | uint64_t sectors = 0; |
1792 | int flags = 0; | |
99cce9fa | 1793 | size_t cluster_size = DEFAULT_CLUSTER_SIZE; |
de5f3f40 | 1794 | int prealloc = 0; |
8ad1898c | 1795 | int version = 3; |
3ef6c40a HR |
1796 | Error *local_err = NULL; |
1797 | int ret; | |
de5f3f40 KW |
1798 | |
1799 | /* Read out options */ | |
1bd0e2d1 CL |
1800 | sectors = qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0) / 512; |
1801 | backing_file = qemu_opt_get_del(opts, BLOCK_OPT_BACKING_FILE); | |
1802 | backing_fmt = qemu_opt_get_del(opts, BLOCK_OPT_BACKING_FMT); | |
1803 | if (qemu_opt_get_bool_del(opts, BLOCK_OPT_ENCRYPT, false)) { | |
1804 | flags |= BLOCK_FLAG_ENCRYPT; | |
1805 | } | |
1806 | cluster_size = qemu_opt_get_size_del(opts, BLOCK_OPT_CLUSTER_SIZE, | |
1807 | DEFAULT_CLUSTER_SIZE); | |
1808 | buf = qemu_opt_get_del(opts, BLOCK_OPT_PREALLOC); | |
1809 | if (!buf || !strcmp(buf, "off")) { | |
1810 | prealloc = 0; | |
1811 | } else if (!strcmp(buf, "metadata")) { | |
1812 | prealloc = 1; | |
1813 | } else { | |
1814 | error_setg(errp, "Invalid preallocation mode: '%s'", buf); | |
1815 | ret = -EINVAL; | |
1816 | goto finish; | |
1817 | } | |
1818 | g_free(buf); | |
1819 | buf = qemu_opt_get_del(opts, BLOCK_OPT_COMPAT_LEVEL); | |
1820 | if (!buf) { | |
1821 | /* keep the default */ | |
1822 | } else if (!strcmp(buf, "0.10")) { | |
1823 | version = 2; | |
1824 | } else if (!strcmp(buf, "1.1")) { | |
1825 | version = 3; | |
1826 | } else { | |
1827 | error_setg(errp, "Invalid compatibility level: '%s'", buf); | |
1828 | ret = -EINVAL; | |
1829 | goto finish; | |
1830 | } | |
1831 | ||
1832 | if (qemu_opt_get_bool_del(opts, BLOCK_OPT_LAZY_REFCOUNTS, false)) { | |
1833 | flags |= BLOCK_FLAG_LAZY_REFCOUNTS; | |
de5f3f40 KW |
1834 | } |
1835 | ||
1836 | if (backing_file && prealloc) { | |
3ef6c40a HR |
1837 | error_setg(errp, "Backing file and preallocation cannot be used at " |
1838 | "the same time"); | |
1bd0e2d1 CL |
1839 | ret = -EINVAL; |
1840 | goto finish; | |
de5f3f40 KW |
1841 | } |
1842 | ||
bfe8043e | 1843 | if (version < 3 && (flags & BLOCK_FLAG_LAZY_REFCOUNTS)) { |
3ef6c40a HR |
1844 | error_setg(errp, "Lazy refcounts only supported with compatibility " |
1845 | "level 1.1 and above (use compat=1.1 or greater)"); | |
1bd0e2d1 CL |
1846 | ret = -EINVAL; |
1847 | goto finish; | |
bfe8043e SH |
1848 | } |
1849 | ||
3ef6c40a | 1850 | ret = qcow2_create2(filename, sectors, backing_file, backing_fmt, flags, |
1bd0e2d1 | 1851 | cluster_size, prealloc, opts, version, &local_err); |
84d18f06 | 1852 | if (local_err) { |
3ef6c40a HR |
1853 | error_propagate(errp, local_err); |
1854 | } | |
1bd0e2d1 CL |
1855 | |
1856 | finish: | |
1857 | g_free(backing_file); | |
1858 | g_free(backing_fmt); | |
1859 | g_free(buf); | |
3ef6c40a | 1860 | return ret; |
de5f3f40 KW |
1861 | } |
1862 | ||
621f0589 | 1863 | static coroutine_fn int qcow2_co_write_zeroes(BlockDriverState *bs, |
aa7bfbff | 1864 | int64_t sector_num, int nb_sectors, BdrvRequestFlags flags) |
621f0589 KW |
1865 | { |
1866 | int ret; | |
1867 | BDRVQcowState *s = bs->opaque; | |
1868 | ||
1869 | /* Emulate misaligned zero writes */ | |
1870 | if (sector_num % s->cluster_sectors || nb_sectors % s->cluster_sectors) { | |
1871 | return -ENOTSUP; | |
1872 | } | |
1873 | ||
1874 | /* Whatever is left can use real zero clusters */ | |
1875 | qemu_co_mutex_lock(&s->lock); | |
1876 | ret = qcow2_zero_clusters(bs, sector_num << BDRV_SECTOR_BITS, | |
1877 | nb_sectors); | |
1878 | qemu_co_mutex_unlock(&s->lock); | |
1879 | ||
1880 | return ret; | |
1881 | } | |
1882 | ||
6db39ae2 PB |
1883 | static coroutine_fn int qcow2_co_discard(BlockDriverState *bs, |
1884 | int64_t sector_num, int nb_sectors) | |
5ea929e3 | 1885 | { |
6db39ae2 PB |
1886 | int ret; |
1887 | BDRVQcowState *s = bs->opaque; | |
1888 | ||
1889 | qemu_co_mutex_lock(&s->lock); | |
1890 | ret = qcow2_discard_clusters(bs, sector_num << BDRV_SECTOR_BITS, | |
670df5e3 | 1891 | nb_sectors, QCOW2_DISCARD_REQUEST); |
6db39ae2 PB |
1892 | qemu_co_mutex_unlock(&s->lock); |
1893 | return ret; | |
5ea929e3 KW |
1894 | } |
1895 | ||
419b19d9 SH |
1896 | static int qcow2_truncate(BlockDriverState *bs, int64_t offset) |
1897 | { | |
1898 | BDRVQcowState *s = bs->opaque; | |
2cf7cfa1 KW |
1899 | int64_t new_l1_size; |
1900 | int ret; | |
419b19d9 SH |
1901 | |
1902 | if (offset & 511) { | |
259b2173 | 1903 | error_report("The new size must be a multiple of 512"); |
419b19d9 SH |
1904 | return -EINVAL; |
1905 | } | |
1906 | ||
1907 | /* cannot proceed if image has snapshots */ | |
1908 | if (s->nb_snapshots) { | |
259b2173 | 1909 | error_report("Can't resize an image which has snapshots"); |
419b19d9 SH |
1910 | return -ENOTSUP; |
1911 | } | |
1912 | ||
1913 | /* shrinking is currently not supported */ | |
1914 | if (offset < bs->total_sectors * 512) { | |
259b2173 | 1915 | error_report("qcow2 doesn't support shrinking images yet"); |
419b19d9 SH |
1916 | return -ENOTSUP; |
1917 | } | |
1918 | ||
1919 | new_l1_size = size_to_l1(s, offset); | |
72893756 | 1920 | ret = qcow2_grow_l1_table(bs, new_l1_size, true); |
419b19d9 SH |
1921 | if (ret < 0) { |
1922 | return ret; | |
1923 | } | |
1924 | ||
1925 | /* write updated header.size */ | |
1926 | offset = cpu_to_be64(offset); | |
8b3b7206 KW |
1927 | ret = bdrv_pwrite_sync(bs->file, offsetof(QCowHeader, size), |
1928 | &offset, sizeof(uint64_t)); | |
419b19d9 SH |
1929 | if (ret < 0) { |
1930 | return ret; | |
1931 | } | |
1932 | ||
1933 | s->l1_vm_state_index = new_l1_size; | |
1934 | return 0; | |
1935 | } | |
1936 | ||
20d97356 BS |
1937 | /* XXX: put compressed sectors first, then all the cluster aligned |
1938 | tables to avoid losing bytes in alignment */ | |
7c80ab3f JS |
1939 | static int qcow2_write_compressed(BlockDriverState *bs, int64_t sector_num, |
1940 | const uint8_t *buf, int nb_sectors) | |
20d97356 BS |
1941 | { |
1942 | BDRVQcowState *s = bs->opaque; | |
1943 | z_stream strm; | |
1944 | int ret, out_len; | |
1945 | uint8_t *out_buf; | |
1946 | uint64_t cluster_offset; | |
1947 | ||
1948 | if (nb_sectors == 0) { | |
1949 | /* align end of file to a sector boundary to ease reading with | |
1950 | sector based I/Os */ | |
66f82cee | 1951 | cluster_offset = bdrv_getlength(bs->file); |
20d97356 | 1952 | cluster_offset = (cluster_offset + 511) & ~511; |
66f82cee | 1953 | bdrv_truncate(bs->file, cluster_offset); |
20d97356 BS |
1954 | return 0; |
1955 | } | |
1956 | ||
f4d38bef SH |
1957 | if (nb_sectors != s->cluster_sectors) { |
1958 | ret = -EINVAL; | |
1959 | ||
1960 | /* Zero-pad last write if image size is not cluster aligned */ | |
1961 | if (sector_num + nb_sectors == bs->total_sectors && | |
1962 | nb_sectors < s->cluster_sectors) { | |
1963 | uint8_t *pad_buf = qemu_blockalign(bs, s->cluster_size); | |
1964 | memset(pad_buf, 0, s->cluster_size); | |
1965 | memcpy(pad_buf, buf, nb_sectors * BDRV_SECTOR_SIZE); | |
1966 | ret = qcow2_write_compressed(bs, sector_num, | |
1967 | pad_buf, s->cluster_sectors); | |
1968 | qemu_vfree(pad_buf); | |
1969 | } | |
1970 | return ret; | |
1971 | } | |
20d97356 | 1972 | |
7267c094 | 1973 | out_buf = g_malloc(s->cluster_size + (s->cluster_size / 1000) + 128); |
20d97356 BS |
1974 | |
1975 | /* best compression, small window, no zlib header */ | |
1976 | memset(&strm, 0, sizeof(strm)); | |
1977 | ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION, | |
1978 | Z_DEFLATED, -12, | |
1979 | 9, Z_DEFAULT_STRATEGY); | |
1980 | if (ret != 0) { | |
8f1efd00 KW |
1981 | ret = -EINVAL; |
1982 | goto fail; | |
20d97356 BS |
1983 | } |
1984 | ||
1985 | strm.avail_in = s->cluster_size; | |
1986 | strm.next_in = (uint8_t *)buf; | |
1987 | strm.avail_out = s->cluster_size; | |
1988 | strm.next_out = out_buf; | |
1989 | ||
1990 | ret = deflate(&strm, Z_FINISH); | |
1991 | if (ret != Z_STREAM_END && ret != Z_OK) { | |
20d97356 | 1992 | deflateEnd(&strm); |
8f1efd00 KW |
1993 | ret = -EINVAL; |
1994 | goto fail; | |
20d97356 BS |
1995 | } |
1996 | out_len = strm.next_out - out_buf; | |
1997 | ||
1998 | deflateEnd(&strm); | |
1999 | ||
2000 | if (ret != Z_STREAM_END || out_len >= s->cluster_size) { | |
2001 | /* could not compress: write normal cluster */ | |
8f1efd00 KW |
2002 | ret = bdrv_write(bs, sector_num, buf, s->cluster_sectors); |
2003 | if (ret < 0) { | |
2004 | goto fail; | |
2005 | } | |
20d97356 BS |
2006 | } else { |
2007 | cluster_offset = qcow2_alloc_compressed_cluster_offset(bs, | |
2008 | sector_num << 9, out_len); | |
8f1efd00 KW |
2009 | if (!cluster_offset) { |
2010 | ret = -EIO; | |
2011 | goto fail; | |
2012 | } | |
20d97356 | 2013 | cluster_offset &= s->cluster_offset_mask; |
cf93980e | 2014 | |
231bb267 | 2015 | ret = qcow2_pre_write_overlap_check(bs, 0, cluster_offset, out_len); |
cf93980e HR |
2016 | if (ret < 0) { |
2017 | goto fail; | |
2018 | } | |
2019 | ||
66f82cee | 2020 | BLKDBG_EVENT(bs->file, BLKDBG_WRITE_COMPRESSED); |
8f1efd00 KW |
2021 | ret = bdrv_pwrite(bs->file, cluster_offset, out_buf, out_len); |
2022 | if (ret < 0) { | |
2023 | goto fail; | |
20d97356 BS |
2024 | } |
2025 | } | |
2026 | ||
8f1efd00 KW |
2027 | ret = 0; |
2028 | fail: | |
7267c094 | 2029 | g_free(out_buf); |
8f1efd00 | 2030 | return ret; |
20d97356 BS |
2031 | } |
2032 | ||
a968168c | 2033 | static coroutine_fn int qcow2_co_flush_to_os(BlockDriverState *bs) |
20d97356 | 2034 | { |
29c1a730 KW |
2035 | BDRVQcowState *s = bs->opaque; |
2036 | int ret; | |
2037 | ||
8b94ff85 | 2038 | qemu_co_mutex_lock(&s->lock); |
29c1a730 KW |
2039 | ret = qcow2_cache_flush(bs, s->l2_table_cache); |
2040 | if (ret < 0) { | |
c95de7e2 | 2041 | qemu_co_mutex_unlock(&s->lock); |
8b94ff85 | 2042 | return ret; |
29c1a730 KW |
2043 | } |
2044 | ||
bfe8043e SH |
2045 | if (qcow2_need_accurate_refcounts(s)) { |
2046 | ret = qcow2_cache_flush(bs, s->refcount_block_cache); | |
2047 | if (ret < 0) { | |
2048 | qemu_co_mutex_unlock(&s->lock); | |
2049 | return ret; | |
2050 | } | |
29c1a730 | 2051 | } |
8b94ff85 | 2052 | qemu_co_mutex_unlock(&s->lock); |
29c1a730 | 2053 | |
eb489bb1 KW |
2054 | return 0; |
2055 | } | |
2056 | ||
7c80ab3f | 2057 | static int qcow2_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
20d97356 BS |
2058 | { |
2059 | BDRVQcowState *s = bs->opaque; | |
95de6d70 PB |
2060 | bdi->unallocated_blocks_are_zero = true; |
2061 | bdi->can_write_zeroes_with_unmap = (s->qcow_version >= 3); | |
20d97356 | 2062 | bdi->cluster_size = s->cluster_size; |
7c80ab3f | 2063 | bdi->vm_state_offset = qcow2_vm_state_offset(s); |
20d97356 BS |
2064 | return 0; |
2065 | } | |
2066 | ||
37764dfb HR |
2067 | static ImageInfoSpecific *qcow2_get_specific_info(BlockDriverState *bs) |
2068 | { | |
2069 | BDRVQcowState *s = bs->opaque; | |
2070 | ImageInfoSpecific *spec_info = g_new(ImageInfoSpecific, 1); | |
2071 | ||
2072 | *spec_info = (ImageInfoSpecific){ | |
2073 | .kind = IMAGE_INFO_SPECIFIC_KIND_QCOW2, | |
2074 | { | |
2075 | .qcow2 = g_new(ImageInfoSpecificQCow2, 1), | |
2076 | }, | |
2077 | }; | |
2078 | if (s->qcow_version == 2) { | |
2079 | *spec_info->qcow2 = (ImageInfoSpecificQCow2){ | |
2080 | .compat = g_strdup("0.10"), | |
2081 | }; | |
2082 | } else if (s->qcow_version == 3) { | |
2083 | *spec_info->qcow2 = (ImageInfoSpecificQCow2){ | |
2084 | .compat = g_strdup("1.1"), | |
2085 | .lazy_refcounts = s->compatible_features & | |
2086 | QCOW2_COMPAT_LAZY_REFCOUNTS, | |
2087 | .has_lazy_refcounts = true, | |
2088 | }; | |
2089 | } | |
2090 | ||
2091 | return spec_info; | |
2092 | } | |
2093 | ||
20d97356 BS |
2094 | #if 0 |
2095 | static void dump_refcounts(BlockDriverState *bs) | |
2096 | { | |
2097 | BDRVQcowState *s = bs->opaque; | |
2098 | int64_t nb_clusters, k, k1, size; | |
2099 | int refcount; | |
2100 | ||
66f82cee | 2101 | size = bdrv_getlength(bs->file); |
20d97356 BS |
2102 | nb_clusters = size_to_clusters(s, size); |
2103 | for(k = 0; k < nb_clusters;) { | |
2104 | k1 = k; | |
2105 | refcount = get_refcount(bs, k); | |
2106 | k++; | |
2107 | while (k < nb_clusters && get_refcount(bs, k) == refcount) | |
2108 | k++; | |
0bfcd599 BS |
2109 | printf("%" PRId64 ": refcount=%d nb=%" PRId64 "\n", k, refcount, |
2110 | k - k1); | |
20d97356 BS |
2111 | } |
2112 | } | |
2113 | #endif | |
2114 | ||
cf8074b3 KW |
2115 | static int qcow2_save_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, |
2116 | int64_t pos) | |
20d97356 BS |
2117 | { |
2118 | BDRVQcowState *s = bs->opaque; | |
eedff66f | 2119 | int64_t total_sectors = bs->total_sectors; |
20d97356 | 2120 | int growable = bs->growable; |
6e13610a | 2121 | bool zero_beyond_eof = bs->zero_beyond_eof; |
20d97356 BS |
2122 | int ret; |
2123 | ||
66f82cee | 2124 | BLKDBG_EVENT(bs->file, BLKDBG_VMSTATE_SAVE); |
20d97356 | 2125 | bs->growable = 1; |
6e13610a | 2126 | bs->zero_beyond_eof = false; |
8d3b1a2d | 2127 | ret = bdrv_pwritev(bs, qcow2_vm_state_offset(s) + pos, qiov); |
20d97356 | 2128 | bs->growable = growable; |
6e13610a | 2129 | bs->zero_beyond_eof = zero_beyond_eof; |
20d97356 | 2130 | |
eedff66f HR |
2131 | /* bdrv_co_do_writev will have increased the total_sectors value to include |
2132 | * the VM state - the VM state is however not an actual part of the block | |
2133 | * device, therefore, we need to restore the old value. */ | |
2134 | bs->total_sectors = total_sectors; | |
2135 | ||
20d97356 BS |
2136 | return ret; |
2137 | } | |
2138 | ||
7c80ab3f JS |
2139 | static int qcow2_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
2140 | int64_t pos, int size) | |
20d97356 BS |
2141 | { |
2142 | BDRVQcowState *s = bs->opaque; | |
2143 | int growable = bs->growable; | |
0d51b4de | 2144 | bool zero_beyond_eof = bs->zero_beyond_eof; |
20d97356 BS |
2145 | int ret; |
2146 | ||
66f82cee | 2147 | BLKDBG_EVENT(bs->file, BLKDBG_VMSTATE_LOAD); |
20d97356 | 2148 | bs->growable = 1; |
0d51b4de | 2149 | bs->zero_beyond_eof = false; |
7c80ab3f | 2150 | ret = bdrv_pread(bs, qcow2_vm_state_offset(s) + pos, buf, size); |
20d97356 | 2151 | bs->growable = growable; |
0d51b4de | 2152 | bs->zero_beyond_eof = zero_beyond_eof; |
20d97356 BS |
2153 | |
2154 | return ret; | |
2155 | } | |
2156 | ||
9296b3ed HR |
2157 | /* |
2158 | * Downgrades an image's version. To achieve this, any incompatible features | |
2159 | * have to be removed. | |
2160 | */ | |
2161 | static int qcow2_downgrade(BlockDriverState *bs, int target_version) | |
2162 | { | |
2163 | BDRVQcowState *s = bs->opaque; | |
2164 | int current_version = s->qcow_version; | |
2165 | int ret; | |
2166 | ||
2167 | if (target_version == current_version) { | |
2168 | return 0; | |
2169 | } else if (target_version > current_version) { | |
2170 | return -EINVAL; | |
2171 | } else if (target_version != 2) { | |
2172 | return -EINVAL; | |
2173 | } | |
2174 | ||
2175 | if (s->refcount_order != 4) { | |
2176 | /* we would have to convert the image to a refcount_order == 4 image | |
2177 | * here; however, since qemu (at the time of writing this) does not | |
2178 | * support anything different than 4 anyway, there is no point in doing | |
2179 | * so right now; however, we should error out (if qemu supports this in | |
2180 | * the future and this code has not been adapted) */ | |
9e3f0892 | 2181 | error_report("qcow2_downgrade: Image refcount orders other than 4 are " |
9296b3ed HR |
2182 | "currently not supported."); |
2183 | return -ENOTSUP; | |
2184 | } | |
2185 | ||
2186 | /* clear incompatible features */ | |
2187 | if (s->incompatible_features & QCOW2_INCOMPAT_DIRTY) { | |
2188 | ret = qcow2_mark_clean(bs); | |
2189 | if (ret < 0) { | |
2190 | return ret; | |
2191 | } | |
2192 | } | |
2193 | ||
2194 | /* with QCOW2_INCOMPAT_CORRUPT, it is pretty much impossible to get here in | |
2195 | * the first place; if that happens nonetheless, returning -ENOTSUP is the | |
2196 | * best thing to do anyway */ | |
2197 | ||
2198 | if (s->incompatible_features) { | |
2199 | return -ENOTSUP; | |
2200 | } | |
2201 | ||
2202 | /* since we can ignore compatible features, we can set them to 0 as well */ | |
2203 | s->compatible_features = 0; | |
2204 | /* if lazy refcounts have been used, they have already been fixed through | |
2205 | * clearing the dirty flag */ | |
2206 | ||
2207 | /* clearing autoclear features is trivial */ | |
2208 | s->autoclear_features = 0; | |
2209 | ||
2210 | ret = qcow2_expand_zero_clusters(bs); | |
2211 | if (ret < 0) { | |
2212 | return ret; | |
2213 | } | |
2214 | ||
2215 | s->qcow_version = target_version; | |
2216 | ret = qcow2_update_header(bs); | |
2217 | if (ret < 0) { | |
2218 | s->qcow_version = current_version; | |
2219 | return ret; | |
2220 | } | |
2221 | return 0; | |
2222 | } | |
2223 | ||
1bd0e2d1 | 2224 | static int qcow2_amend_options(BlockDriverState *bs, QemuOpts *opts) |
9296b3ed HR |
2225 | { |
2226 | BDRVQcowState *s = bs->opaque; | |
2227 | int old_version = s->qcow_version, new_version = old_version; | |
2228 | uint64_t new_size = 0; | |
2229 | const char *backing_file = NULL, *backing_format = NULL; | |
2230 | bool lazy_refcounts = s->use_lazy_refcounts; | |
1bd0e2d1 CL |
2231 | const char *compat = NULL; |
2232 | uint64_t cluster_size = s->cluster_size; | |
2233 | bool encrypt; | |
9296b3ed | 2234 | int ret; |
1bd0e2d1 | 2235 | QemuOptDesc *desc = opts->list->desc; |
9296b3ed | 2236 | |
1bd0e2d1 CL |
2237 | while (desc && desc->name) { |
2238 | if (!qemu_opt_find(opts, desc->name)) { | |
9296b3ed | 2239 | /* only change explicitly defined options */ |
1bd0e2d1 | 2240 | desc++; |
9296b3ed HR |
2241 | continue; |
2242 | } | |
2243 | ||
1bd0e2d1 CL |
2244 | if (!strcmp(desc->name, "compat")) { |
2245 | compat = qemu_opt_get(opts, "compat"); | |
2246 | if (!compat) { | |
9296b3ed | 2247 | /* preserve default */ |
1bd0e2d1 | 2248 | } else if (!strcmp(compat, "0.10")) { |
9296b3ed | 2249 | new_version = 2; |
1bd0e2d1 | 2250 | } else if (!strcmp(compat, "1.1")) { |
9296b3ed HR |
2251 | new_version = 3; |
2252 | } else { | |
1bd0e2d1 | 2253 | fprintf(stderr, "Unknown compatibility level %s.\n", compat); |
9296b3ed HR |
2254 | return -EINVAL; |
2255 | } | |
1bd0e2d1 | 2256 | } else if (!strcmp(desc->name, "preallocation")) { |
9296b3ed HR |
2257 | fprintf(stderr, "Cannot change preallocation mode.\n"); |
2258 | return -ENOTSUP; | |
1bd0e2d1 CL |
2259 | } else if (!strcmp(desc->name, "size")) { |
2260 | new_size = qemu_opt_get_size(opts, "size", 0); | |
2261 | } else if (!strcmp(desc->name, "backing_file")) { | |
2262 | backing_file = qemu_opt_get(opts, "backing_file"); | |
2263 | } else if (!strcmp(desc->name, "backing_fmt")) { | |
2264 | backing_format = qemu_opt_get(opts, "backing_fmt"); | |
2265 | } else if (!strcmp(desc->name, "encryption")) { | |
2266 | encrypt = qemu_opt_get_bool(opts, "encryption", s->crypt_method); | |
2267 | if (encrypt != !!s->crypt_method) { | |
9296b3ed HR |
2268 | fprintf(stderr, "Changing the encryption flag is not " |
2269 | "supported.\n"); | |
2270 | return -ENOTSUP; | |
2271 | } | |
1bd0e2d1 CL |
2272 | } else if (!strcmp(desc->name, "cluster_size")) { |
2273 | cluster_size = qemu_opt_get_size(opts, "cluster_size", | |
2274 | cluster_size); | |
2275 | if (cluster_size != s->cluster_size) { | |
9296b3ed HR |
2276 | fprintf(stderr, "Changing the cluster size is not " |
2277 | "supported.\n"); | |
2278 | return -ENOTSUP; | |
2279 | } | |
1bd0e2d1 CL |
2280 | } else if (!strcmp(desc->name, "lazy_refcounts")) { |
2281 | lazy_refcounts = qemu_opt_get_bool(opts, "lazy_refcounts", | |
2282 | lazy_refcounts); | |
9296b3ed HR |
2283 | } else { |
2284 | /* if this assertion fails, this probably means a new option was | |
2285 | * added without having it covered here */ | |
2286 | assert(false); | |
2287 | } | |
1bd0e2d1 CL |
2288 | |
2289 | desc++; | |
9296b3ed HR |
2290 | } |
2291 | ||
2292 | if (new_version != old_version) { | |
2293 | if (new_version > old_version) { | |
2294 | /* Upgrade */ | |
2295 | s->qcow_version = new_version; | |
2296 | ret = qcow2_update_header(bs); | |
2297 | if (ret < 0) { | |
2298 | s->qcow_version = old_version; | |
2299 | return ret; | |
2300 | } | |
2301 | } else { | |
2302 | ret = qcow2_downgrade(bs, new_version); | |
2303 | if (ret < 0) { | |
2304 | return ret; | |
2305 | } | |
2306 | } | |
2307 | } | |
2308 | ||
2309 | if (backing_file || backing_format) { | |
2310 | ret = qcow2_change_backing_file(bs, backing_file ?: bs->backing_file, | |
2311 | backing_format ?: bs->backing_format); | |
2312 | if (ret < 0) { | |
2313 | return ret; | |
2314 | } | |
2315 | } | |
2316 | ||
2317 | if (s->use_lazy_refcounts != lazy_refcounts) { | |
2318 | if (lazy_refcounts) { | |
2319 | if (s->qcow_version < 3) { | |
2320 | fprintf(stderr, "Lazy refcounts only supported with compatibility " | |
2321 | "level 1.1 and above (use compat=1.1 or greater)\n"); | |
2322 | return -EINVAL; | |
2323 | } | |
2324 | s->compatible_features |= QCOW2_COMPAT_LAZY_REFCOUNTS; | |
2325 | ret = qcow2_update_header(bs); | |
2326 | if (ret < 0) { | |
2327 | s->compatible_features &= ~QCOW2_COMPAT_LAZY_REFCOUNTS; | |
2328 | return ret; | |
2329 | } | |
2330 | s->use_lazy_refcounts = true; | |
2331 | } else { | |
2332 | /* make image clean first */ | |
2333 | ret = qcow2_mark_clean(bs); | |
2334 | if (ret < 0) { | |
2335 | return ret; | |
2336 | } | |
2337 | /* now disallow lazy refcounts */ | |
2338 | s->compatible_features &= ~QCOW2_COMPAT_LAZY_REFCOUNTS; | |
2339 | ret = qcow2_update_header(bs); | |
2340 | if (ret < 0) { | |
2341 | s->compatible_features |= QCOW2_COMPAT_LAZY_REFCOUNTS; | |
2342 | return ret; | |
2343 | } | |
2344 | s->use_lazy_refcounts = false; | |
2345 | } | |
2346 | } | |
2347 | ||
2348 | if (new_size) { | |
2349 | ret = bdrv_truncate(bs, new_size); | |
2350 | if (ret < 0) { | |
2351 | return ret; | |
2352 | } | |
2353 | } | |
2354 | ||
2355 | return 0; | |
2356 | } | |
2357 | ||
1bd0e2d1 CL |
2358 | static QemuOptsList qcow2_create_opts = { |
2359 | .name = "qcow2-create-opts", | |
2360 | .head = QTAILQ_HEAD_INITIALIZER(qcow2_create_opts.head), | |
2361 | .desc = { | |
2362 | { | |
2363 | .name = BLOCK_OPT_SIZE, | |
2364 | .type = QEMU_OPT_SIZE, | |
2365 | .help = "Virtual disk size" | |
2366 | }, | |
2367 | { | |
2368 | .name = BLOCK_OPT_COMPAT_LEVEL, | |
2369 | .type = QEMU_OPT_STRING, | |
2370 | .help = "Compatibility level (0.10 or 1.1)" | |
2371 | }, | |
2372 | { | |
2373 | .name = BLOCK_OPT_BACKING_FILE, | |
2374 | .type = QEMU_OPT_STRING, | |
2375 | .help = "File name of a base image" | |
2376 | }, | |
2377 | { | |
2378 | .name = BLOCK_OPT_BACKING_FMT, | |
2379 | .type = QEMU_OPT_STRING, | |
2380 | .help = "Image format of the base image" | |
2381 | }, | |
2382 | { | |
2383 | .name = BLOCK_OPT_ENCRYPT, | |
2384 | .type = QEMU_OPT_BOOL, | |
2385 | .help = "Encrypt the image", | |
2386 | .def_value_str = "off" | |
2387 | }, | |
2388 | { | |
2389 | .name = BLOCK_OPT_CLUSTER_SIZE, | |
2390 | .type = QEMU_OPT_SIZE, | |
2391 | .help = "qcow2 cluster size", | |
2392 | .def_value_str = stringify(DEFAULT_CLUSTER_SIZE) | |
2393 | }, | |
2394 | { | |
2395 | .name = BLOCK_OPT_PREALLOC, | |
2396 | .type = QEMU_OPT_STRING, | |
2397 | .help = "Preallocation mode (allowed values: off, metadata)" | |
2398 | }, | |
2399 | { | |
2400 | .name = BLOCK_OPT_LAZY_REFCOUNTS, | |
2401 | .type = QEMU_OPT_BOOL, | |
2402 | .help = "Postpone refcount updates", | |
2403 | .def_value_str = "off" | |
2404 | }, | |
2405 | { /* end of list */ } | |
2406 | } | |
20d97356 BS |
2407 | }; |
2408 | ||
2409 | static BlockDriver bdrv_qcow2 = { | |
7c80ab3f JS |
2410 | .format_name = "qcow2", |
2411 | .instance_size = sizeof(BDRVQcowState), | |
2412 | .bdrv_probe = qcow2_probe, | |
2413 | .bdrv_open = qcow2_open, | |
2414 | .bdrv_close = qcow2_close, | |
21d82ac9 | 2415 | .bdrv_reopen_prepare = qcow2_reopen_prepare, |
c282e1fd | 2416 | .bdrv_create = qcow2_create, |
3ac21627 | 2417 | .bdrv_has_zero_init = bdrv_has_zero_init_1, |
b6b8a333 | 2418 | .bdrv_co_get_block_status = qcow2_co_get_block_status, |
7c80ab3f | 2419 | .bdrv_set_key = qcow2_set_key, |
7c80ab3f | 2420 | |
c68b89ac KW |
2421 | .bdrv_co_readv = qcow2_co_readv, |
2422 | .bdrv_co_writev = qcow2_co_writev, | |
eb489bb1 | 2423 | .bdrv_co_flush_to_os = qcow2_co_flush_to_os, |
419b19d9 | 2424 | |
621f0589 | 2425 | .bdrv_co_write_zeroes = qcow2_co_write_zeroes, |
6db39ae2 | 2426 | .bdrv_co_discard = qcow2_co_discard, |
419b19d9 | 2427 | .bdrv_truncate = qcow2_truncate, |
7c80ab3f | 2428 | .bdrv_write_compressed = qcow2_write_compressed, |
20d97356 BS |
2429 | |
2430 | .bdrv_snapshot_create = qcow2_snapshot_create, | |
2431 | .bdrv_snapshot_goto = qcow2_snapshot_goto, | |
2432 | .bdrv_snapshot_delete = qcow2_snapshot_delete, | |
2433 | .bdrv_snapshot_list = qcow2_snapshot_list, | |
1bd0e2d1 CL |
2434 | .bdrv_snapshot_load_tmp = qcow2_snapshot_load_tmp, |
2435 | .bdrv_get_info = qcow2_get_info, | |
37764dfb | 2436 | .bdrv_get_specific_info = qcow2_get_specific_info, |
20d97356 | 2437 | |
7c80ab3f JS |
2438 | .bdrv_save_vmstate = qcow2_save_vmstate, |
2439 | .bdrv_load_vmstate = qcow2_load_vmstate, | |
20d97356 | 2440 | |
8ee79e70 | 2441 | .supports_backing = true, |
20d97356 BS |
2442 | .bdrv_change_backing_file = qcow2_change_backing_file, |
2443 | ||
d34682cd | 2444 | .bdrv_refresh_limits = qcow2_refresh_limits, |
06d9260f AL |
2445 | .bdrv_invalidate_cache = qcow2_invalidate_cache, |
2446 | ||
1bd0e2d1 CL |
2447 | .create_opts = &qcow2_create_opts, |
2448 | .bdrv_check = qcow2_check, | |
c282e1fd | 2449 | .bdrv_amend_options = qcow2_amend_options, |
20d97356 BS |
2450 | }; |
2451 | ||
5efa9d5a AL |
2452 | static void bdrv_qcow2_init(void) |
2453 | { | |
2454 | bdrv_register(&bdrv_qcow2); | |
2455 | } | |
2456 | ||
2457 | block_init(bdrv_qcow2_init); |