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Commit | Line | Data |
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585f8587 FB |
1 | /* |
2 | * Block driver for the QCOW version 2 format | |
5fafdf24 | 3 | * |
585f8587 | 4 | * Copyright (c) 2004-2006 Fabrice Bellard |
5fafdf24 | 5 | * |
585f8587 FB |
6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
7 | * of this software and associated documentation files (the "Software"), to deal | |
8 | * in the Software without restriction, including without limitation the rights | |
9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
10 | * copies of the Software, and to permit persons to whom the Software is | |
11 | * furnished to do so, subject to the following conditions: | |
12 | * | |
13 | * The above copyright notice and this permission notice shall be included in | |
14 | * all copies or substantial portions of the Software. | |
15 | * | |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
22 | * THE SOFTWARE. | |
23 | */ | |
faf07963 | 24 | #include "qemu-common.h" |
737e150e | 25 | #include "block/block_int.h" |
1de7afc9 | 26 | #include "qemu/module.h" |
585f8587 | 27 | #include <zlib.h> |
753d9b82 | 28 | #include "qemu/aes.h" |
f7d0fe02 | 29 | #include "block/qcow2.h" |
1de7afc9 | 30 | #include "qemu/error-report.h" |
7b1b5d19 | 31 | #include "qapi/qmp/qerror.h" |
acdfb480 | 32 | #include "qapi/qmp/qbool.h" |
3cce16f4 | 33 | #include "trace.h" |
585f8587 FB |
34 | |
35 | /* | |
36 | Differences with QCOW: | |
37 | ||
38 | - Support for multiple incremental snapshots. | |
39 | - Memory management by reference counts. | |
40 | - Clusters which have a reference count of one have the bit | |
41 | QCOW_OFLAG_COPIED to optimize write performance. | |
5fafdf24 | 42 | - Size of compressed clusters is stored in sectors to reduce bit usage |
585f8587 FB |
43 | in the cluster offsets. |
44 | - Support for storing additional data (such as the VM state) in the | |
3b46e624 | 45 | snapshots. |
585f8587 FB |
46 | - If a backing store is used, the cluster size is not constrained |
47 | (could be backported to QCOW). | |
48 | - L2 tables have always a size of one cluster. | |
49 | */ | |
50 | ||
9b80ddf3 AL |
51 | |
52 | typedef struct { | |
53 | uint32_t magic; | |
54 | uint32_t len; | |
55 | } QCowExtension; | |
21d82ac9 | 56 | |
7c80ab3f JS |
57 | #define QCOW2_EXT_MAGIC_END 0 |
58 | #define QCOW2_EXT_MAGIC_BACKING_FORMAT 0xE2792ACA | |
cfcc4c62 | 59 | #define QCOW2_EXT_MAGIC_FEATURE_TABLE 0x6803f857 |
9b80ddf3 | 60 | |
7c80ab3f | 61 | static int qcow2_probe(const uint8_t *buf, int buf_size, const char *filename) |
585f8587 FB |
62 | { |
63 | const QCowHeader *cow_header = (const void *)buf; | |
3b46e624 | 64 | |
585f8587 FB |
65 | if (buf_size >= sizeof(QCowHeader) && |
66 | be32_to_cpu(cow_header->magic) == QCOW_MAGIC && | |
6744cbab | 67 | be32_to_cpu(cow_header->version) >= 2) |
585f8587 FB |
68 | return 100; |
69 | else | |
70 | return 0; | |
71 | } | |
72 | ||
9b80ddf3 AL |
73 | |
74 | /* | |
75 | * read qcow2 extension and fill bs | |
76 | * start reading from start_offset | |
77 | * finish reading upon magic of value 0 or when end_offset reached | |
78 | * unknown magic is skipped (future extension this version knows nothing about) | |
79 | * return 0 upon success, non-0 otherwise | |
80 | */ | |
7c80ab3f | 81 | static int qcow2_read_extensions(BlockDriverState *bs, uint64_t start_offset, |
cfcc4c62 | 82 | uint64_t end_offset, void **p_feature_table) |
9b80ddf3 | 83 | { |
75bab85c | 84 | BDRVQcowState *s = bs->opaque; |
9b80ddf3 AL |
85 | QCowExtension ext; |
86 | uint64_t offset; | |
75bab85c | 87 | int ret; |
9b80ddf3 AL |
88 | |
89 | #ifdef DEBUG_EXT | |
7c80ab3f | 90 | printf("qcow2_read_extensions: start=%ld end=%ld\n", start_offset, end_offset); |
9b80ddf3 AL |
91 | #endif |
92 | offset = start_offset; | |
93 | while (offset < end_offset) { | |
94 | ||
95 | #ifdef DEBUG_EXT | |
96 | /* Sanity check */ | |
97 | if (offset > s->cluster_size) | |
7c80ab3f | 98 | printf("qcow2_read_extension: suspicious offset %lu\n", offset); |
9b80ddf3 | 99 | |
9b2260cb | 100 | printf("attempting to read extended header in offset %lu\n", offset); |
9b80ddf3 AL |
101 | #endif |
102 | ||
66f82cee | 103 | if (bdrv_pread(bs->file, offset, &ext, sizeof(ext)) != sizeof(ext)) { |
7c80ab3f | 104 | fprintf(stderr, "qcow2_read_extension: ERROR: " |
0bfcd599 BS |
105 | "pread fail from offset %" PRIu64 "\n", |
106 | offset); | |
9b80ddf3 AL |
107 | return 1; |
108 | } | |
109 | be32_to_cpus(&ext.magic); | |
110 | be32_to_cpus(&ext.len); | |
111 | offset += sizeof(ext); | |
112 | #ifdef DEBUG_EXT | |
113 | printf("ext.magic = 0x%x\n", ext.magic); | |
114 | #endif | |
64ca6aee KW |
115 | if (ext.len > end_offset - offset) { |
116 | error_report("Header extension too large"); | |
117 | return -EINVAL; | |
118 | } | |
119 | ||
9b80ddf3 | 120 | switch (ext.magic) { |
7c80ab3f | 121 | case QCOW2_EXT_MAGIC_END: |
9b80ddf3 | 122 | return 0; |
f965509c | 123 | |
7c80ab3f | 124 | case QCOW2_EXT_MAGIC_BACKING_FORMAT: |
f965509c AL |
125 | if (ext.len >= sizeof(bs->backing_format)) { |
126 | fprintf(stderr, "ERROR: ext_backing_format: len=%u too large" | |
4c978075 | 127 | " (>=%zu)\n", |
f965509c AL |
128 | ext.len, sizeof(bs->backing_format)); |
129 | return 2; | |
130 | } | |
66f82cee | 131 | if (bdrv_pread(bs->file, offset , bs->backing_format, |
f965509c AL |
132 | ext.len) != ext.len) |
133 | return 3; | |
134 | bs->backing_format[ext.len] = '\0'; | |
135 | #ifdef DEBUG_EXT | |
136 | printf("Qcow2: Got format extension %s\n", bs->backing_format); | |
137 | #endif | |
f965509c AL |
138 | break; |
139 | ||
cfcc4c62 KW |
140 | case QCOW2_EXT_MAGIC_FEATURE_TABLE: |
141 | if (p_feature_table != NULL) { | |
142 | void* feature_table = g_malloc0(ext.len + 2 * sizeof(Qcow2Feature)); | |
143 | ret = bdrv_pread(bs->file, offset , feature_table, ext.len); | |
144 | if (ret < 0) { | |
145 | return ret; | |
146 | } | |
147 | ||
148 | *p_feature_table = feature_table; | |
149 | } | |
150 | break; | |
151 | ||
9b80ddf3 | 152 | default: |
75bab85c KW |
153 | /* unknown magic - save it in case we need to rewrite the header */ |
154 | { | |
155 | Qcow2UnknownHeaderExtension *uext; | |
156 | ||
157 | uext = g_malloc0(sizeof(*uext) + ext.len); | |
158 | uext->magic = ext.magic; | |
159 | uext->len = ext.len; | |
160 | QLIST_INSERT_HEAD(&s->unknown_header_ext, uext, next); | |
161 | ||
162 | ret = bdrv_pread(bs->file, offset , uext->data, uext->len); | |
163 | if (ret < 0) { | |
164 | return ret; | |
165 | } | |
75bab85c | 166 | } |
9b80ddf3 AL |
167 | break; |
168 | } | |
fd29b4bb KW |
169 | |
170 | offset += ((ext.len + 7) & ~7); | |
9b80ddf3 AL |
171 | } |
172 | ||
173 | return 0; | |
174 | } | |
175 | ||
75bab85c KW |
176 | static void cleanup_unknown_header_ext(BlockDriverState *bs) |
177 | { | |
178 | BDRVQcowState *s = bs->opaque; | |
179 | Qcow2UnknownHeaderExtension *uext, *next; | |
180 | ||
181 | QLIST_FOREACH_SAFE(uext, &s->unknown_header_ext, next, next) { | |
182 | QLIST_REMOVE(uext, next); | |
183 | g_free(uext); | |
184 | } | |
185 | } | |
9b80ddf3 | 186 | |
b9531b6e SW |
187 | static void GCC_FMT_ATTR(2, 3) report_unsupported(BlockDriverState *bs, |
188 | const char *fmt, ...) | |
6744cbab KW |
189 | { |
190 | char msg[64]; | |
191 | va_list ap; | |
192 | ||
193 | va_start(ap, fmt); | |
194 | vsnprintf(msg, sizeof(msg), fmt, ap); | |
195 | va_end(ap); | |
196 | ||
197 | qerror_report(QERR_UNKNOWN_BLOCK_FORMAT_FEATURE, | |
198 | bs->device_name, "qcow2", msg); | |
199 | } | |
200 | ||
cfcc4c62 KW |
201 | static void report_unsupported_feature(BlockDriverState *bs, |
202 | Qcow2Feature *table, uint64_t mask) | |
203 | { | |
204 | while (table && table->name[0] != '\0') { | |
205 | if (table->type == QCOW2_FEAT_TYPE_INCOMPATIBLE) { | |
206 | if (mask & (1 << table->bit)) { | |
207 | report_unsupported(bs, "%.46s",table->name); | |
208 | mask &= ~(1 << table->bit); | |
209 | } | |
210 | } | |
211 | table++; | |
212 | } | |
213 | ||
214 | if (mask) { | |
215 | report_unsupported(bs, "Unknown incompatible feature: %" PRIx64, mask); | |
216 | } | |
217 | } | |
218 | ||
bfe8043e SH |
219 | /* |
220 | * Sets the dirty bit and flushes afterwards if necessary. | |
221 | * | |
222 | * The incompatible_features bit is only set if the image file header was | |
223 | * updated successfully. Therefore it is not required to check the return | |
224 | * value of this function. | |
225 | */ | |
280d3735 | 226 | int qcow2_mark_dirty(BlockDriverState *bs) |
bfe8043e SH |
227 | { |
228 | BDRVQcowState *s = bs->opaque; | |
229 | uint64_t val; | |
230 | int ret; | |
231 | ||
232 | assert(s->qcow_version >= 3); | |
233 | ||
234 | if (s->incompatible_features & QCOW2_INCOMPAT_DIRTY) { | |
235 | return 0; /* already dirty */ | |
236 | } | |
237 | ||
238 | val = cpu_to_be64(s->incompatible_features | QCOW2_INCOMPAT_DIRTY); | |
239 | ret = bdrv_pwrite(bs->file, offsetof(QCowHeader, incompatible_features), | |
240 | &val, sizeof(val)); | |
241 | if (ret < 0) { | |
242 | return ret; | |
243 | } | |
244 | ret = bdrv_flush(bs->file); | |
245 | if (ret < 0) { | |
246 | return ret; | |
247 | } | |
248 | ||
249 | /* Only treat image as dirty if the header was updated successfully */ | |
250 | s->incompatible_features |= QCOW2_INCOMPAT_DIRTY; | |
251 | return 0; | |
252 | } | |
253 | ||
c61d0004 SH |
254 | /* |
255 | * Clears the dirty bit and flushes before if necessary. Only call this | |
256 | * function when there are no pending requests, it does not guard against | |
257 | * concurrent requests dirtying the image. | |
258 | */ | |
259 | static int qcow2_mark_clean(BlockDriverState *bs) | |
260 | { | |
261 | BDRVQcowState *s = bs->opaque; | |
262 | ||
263 | if (s->incompatible_features & QCOW2_INCOMPAT_DIRTY) { | |
264 | int ret = bdrv_flush(bs); | |
265 | if (ret < 0) { | |
266 | return ret; | |
267 | } | |
268 | ||
269 | s->incompatible_features &= ~QCOW2_INCOMPAT_DIRTY; | |
270 | return qcow2_update_header(bs); | |
271 | } | |
272 | return 0; | |
273 | } | |
274 | ||
acbe5982 SH |
275 | static int qcow2_check(BlockDriverState *bs, BdrvCheckResult *result, |
276 | BdrvCheckMode fix) | |
277 | { | |
278 | int ret = qcow2_check_refcounts(bs, result, fix); | |
279 | if (ret < 0) { | |
280 | return ret; | |
281 | } | |
282 | ||
283 | if (fix && result->check_errors == 0 && result->corruptions == 0) { | |
284 | return qcow2_mark_clean(bs); | |
285 | } | |
286 | return ret; | |
287 | } | |
288 | ||
74c4510a KW |
289 | static QemuOptsList qcow2_runtime_opts = { |
290 | .name = "qcow2", | |
291 | .head = QTAILQ_HEAD_INITIALIZER(qcow2_runtime_opts.head), | |
292 | .desc = { | |
293 | { | |
294 | .name = "lazy_refcounts", | |
295 | .type = QEMU_OPT_BOOL, | |
296 | .help = "Postpone refcount updates", | |
297 | }, | |
298 | { /* end of list */ } | |
299 | }, | |
300 | }; | |
301 | ||
1a86938f | 302 | static int qcow2_open(BlockDriverState *bs, QDict *options, int flags) |
585f8587 FB |
303 | { |
304 | BDRVQcowState *s = bs->opaque; | |
6d85a57e | 305 | int len, i, ret = 0; |
585f8587 | 306 | QCowHeader header; |
74c4510a KW |
307 | QemuOpts *opts; |
308 | Error *local_err = NULL; | |
9b80ddf3 | 309 | uint64_t ext_end; |
2cf7cfa1 | 310 | uint64_t l1_vm_state_index; |
585f8587 | 311 | |
6d85a57e JS |
312 | ret = bdrv_pread(bs->file, 0, &header, sizeof(header)); |
313 | if (ret < 0) { | |
585f8587 | 314 | goto fail; |
6d85a57e | 315 | } |
585f8587 FB |
316 | be32_to_cpus(&header.magic); |
317 | be32_to_cpus(&header.version); | |
318 | be64_to_cpus(&header.backing_file_offset); | |
319 | be32_to_cpus(&header.backing_file_size); | |
320 | be64_to_cpus(&header.size); | |
321 | be32_to_cpus(&header.cluster_bits); | |
322 | be32_to_cpus(&header.crypt_method); | |
323 | be64_to_cpus(&header.l1_table_offset); | |
324 | be32_to_cpus(&header.l1_size); | |
325 | be64_to_cpus(&header.refcount_table_offset); | |
326 | be32_to_cpus(&header.refcount_table_clusters); | |
327 | be64_to_cpus(&header.snapshots_offset); | |
328 | be32_to_cpus(&header.nb_snapshots); | |
3b46e624 | 329 | |
e8cdcec1 | 330 | if (header.magic != QCOW_MAGIC) { |
15bac0d5 | 331 | ret = -EMEDIUMTYPE; |
585f8587 | 332 | goto fail; |
6d85a57e | 333 | } |
6744cbab KW |
334 | if (header.version < 2 || header.version > 3) { |
335 | report_unsupported(bs, "QCOW version %d", header.version); | |
336 | ret = -ENOTSUP; | |
337 | goto fail; | |
338 | } | |
339 | ||
340 | s->qcow_version = header.version; | |
341 | ||
342 | /* Initialise version 3 header fields */ | |
343 | if (header.version == 2) { | |
344 | header.incompatible_features = 0; | |
345 | header.compatible_features = 0; | |
346 | header.autoclear_features = 0; | |
347 | header.refcount_order = 4; | |
348 | header.header_length = 72; | |
349 | } else { | |
350 | be64_to_cpus(&header.incompatible_features); | |
351 | be64_to_cpus(&header.compatible_features); | |
352 | be64_to_cpus(&header.autoclear_features); | |
353 | be32_to_cpus(&header.refcount_order); | |
354 | be32_to_cpus(&header.header_length); | |
355 | } | |
356 | ||
357 | if (header.header_length > sizeof(header)) { | |
358 | s->unknown_header_fields_size = header.header_length - sizeof(header); | |
359 | s->unknown_header_fields = g_malloc(s->unknown_header_fields_size); | |
360 | ret = bdrv_pread(bs->file, sizeof(header), s->unknown_header_fields, | |
361 | s->unknown_header_fields_size); | |
362 | if (ret < 0) { | |
363 | goto fail; | |
364 | } | |
365 | } | |
366 | ||
cfcc4c62 KW |
367 | if (header.backing_file_offset) { |
368 | ext_end = header.backing_file_offset; | |
369 | } else { | |
370 | ext_end = 1 << header.cluster_bits; | |
371 | } | |
372 | ||
6744cbab KW |
373 | /* Handle feature bits */ |
374 | s->incompatible_features = header.incompatible_features; | |
375 | s->compatible_features = header.compatible_features; | |
376 | s->autoclear_features = header.autoclear_features; | |
377 | ||
c61d0004 | 378 | if (s->incompatible_features & ~QCOW2_INCOMPAT_MASK) { |
cfcc4c62 KW |
379 | void *feature_table = NULL; |
380 | qcow2_read_extensions(bs, header.header_length, ext_end, | |
381 | &feature_table); | |
382 | report_unsupported_feature(bs, feature_table, | |
c61d0004 SH |
383 | s->incompatible_features & |
384 | ~QCOW2_INCOMPAT_MASK); | |
6744cbab KW |
385 | ret = -ENOTSUP; |
386 | goto fail; | |
387 | } | |
388 | ||
6744cbab KW |
389 | /* Check support for various header values */ |
390 | if (header.refcount_order != 4) { | |
391 | report_unsupported(bs, "%d bit reference counts", | |
392 | 1 << header.refcount_order); | |
e8cdcec1 KW |
393 | ret = -ENOTSUP; |
394 | goto fail; | |
395 | } | |
6744cbab | 396 | |
d191d12d | 397 | if (header.cluster_bits < MIN_CLUSTER_BITS || |
6d85a57e JS |
398 | header.cluster_bits > MAX_CLUSTER_BITS) { |
399 | ret = -EINVAL; | |
585f8587 | 400 | goto fail; |
6d85a57e JS |
401 | } |
402 | if (header.crypt_method > QCOW_CRYPT_AES) { | |
403 | ret = -EINVAL; | |
585f8587 | 404 | goto fail; |
6d85a57e | 405 | } |
585f8587 | 406 | s->crypt_method_header = header.crypt_method; |
6d85a57e | 407 | if (s->crypt_method_header) { |
585f8587 | 408 | bs->encrypted = 1; |
6d85a57e | 409 | } |
585f8587 FB |
410 | s->cluster_bits = header.cluster_bits; |
411 | s->cluster_size = 1 << s->cluster_bits; | |
412 | s->cluster_sectors = 1 << (s->cluster_bits - 9); | |
413 | s->l2_bits = s->cluster_bits - 3; /* L2 is always one cluster */ | |
414 | s->l2_size = 1 << s->l2_bits; | |
415 | bs->total_sectors = header.size / 512; | |
416 | s->csize_shift = (62 - (s->cluster_bits - 8)); | |
417 | s->csize_mask = (1 << (s->cluster_bits - 8)) - 1; | |
418 | s->cluster_offset_mask = (1LL << s->csize_shift) - 1; | |
419 | s->refcount_table_offset = header.refcount_table_offset; | |
5fafdf24 | 420 | s->refcount_table_size = |
585f8587 FB |
421 | header.refcount_table_clusters << (s->cluster_bits - 3); |
422 | ||
423 | s->snapshots_offset = header.snapshots_offset; | |
424 | s->nb_snapshots = header.nb_snapshots; | |
425 | ||
426 | /* read the level 1 table */ | |
427 | s->l1_size = header.l1_size; | |
2cf7cfa1 KW |
428 | |
429 | l1_vm_state_index = size_to_l1(s, header.size); | |
430 | if (l1_vm_state_index > INT_MAX) { | |
431 | ret = -EFBIG; | |
432 | goto fail; | |
433 | } | |
434 | s->l1_vm_state_index = l1_vm_state_index; | |
435 | ||
585f8587 FB |
436 | /* the L1 table must contain at least enough entries to put |
437 | header.size bytes */ | |
6d85a57e JS |
438 | if (s->l1_size < s->l1_vm_state_index) { |
439 | ret = -EINVAL; | |
585f8587 | 440 | goto fail; |
6d85a57e | 441 | } |
585f8587 | 442 | s->l1_table_offset = header.l1_table_offset; |
d191d12d | 443 | if (s->l1_size > 0) { |
7267c094 | 444 | s->l1_table = g_malloc0( |
d191d12d | 445 | align_offset(s->l1_size * sizeof(uint64_t), 512)); |
6d85a57e JS |
446 | ret = bdrv_pread(bs->file, s->l1_table_offset, s->l1_table, |
447 | s->l1_size * sizeof(uint64_t)); | |
448 | if (ret < 0) { | |
d191d12d | 449 | goto fail; |
6d85a57e | 450 | } |
d191d12d SW |
451 | for(i = 0;i < s->l1_size; i++) { |
452 | be64_to_cpus(&s->l1_table[i]); | |
453 | } | |
585f8587 | 454 | } |
29c1a730 KW |
455 | |
456 | /* alloc L2 table/refcount block cache */ | |
6af4e9ea PB |
457 | s->l2_table_cache = qcow2_cache_create(bs, L2_CACHE_SIZE); |
458 | s->refcount_block_cache = qcow2_cache_create(bs, REFCOUNT_CACHE_SIZE); | |
29c1a730 | 459 | |
7267c094 | 460 | s->cluster_cache = g_malloc(s->cluster_size); |
585f8587 | 461 | /* one more sector for decompressed data alignment */ |
dea43a65 | 462 | s->cluster_data = qemu_blockalign(bs, QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size |
095a9c58 | 463 | + 512); |
585f8587 | 464 | s->cluster_cache_offset = -1; |
06d9260f | 465 | s->flags = flags; |
3b46e624 | 466 | |
6d85a57e JS |
467 | ret = qcow2_refcount_init(bs); |
468 | if (ret != 0) { | |
585f8587 | 469 | goto fail; |
6d85a57e | 470 | } |
585f8587 | 471 | |
72cf2d4f | 472 | QLIST_INIT(&s->cluster_allocs); |
f214978a | 473 | |
9b80ddf3 | 474 | /* read qcow2 extensions */ |
cfcc4c62 | 475 | if (qcow2_read_extensions(bs, header.header_length, ext_end, NULL)) { |
6d85a57e | 476 | ret = -EINVAL; |
9b80ddf3 | 477 | goto fail; |
6d85a57e | 478 | } |
9b80ddf3 | 479 | |
585f8587 FB |
480 | /* read the backing file name */ |
481 | if (header.backing_file_offset != 0) { | |
482 | len = header.backing_file_size; | |
6d85a57e | 483 | if (len > 1023) { |
585f8587 | 484 | len = 1023; |
6d85a57e JS |
485 | } |
486 | ret = bdrv_pread(bs->file, header.backing_file_offset, | |
487 | bs->backing_file, len); | |
488 | if (ret < 0) { | |
585f8587 | 489 | goto fail; |
6d85a57e | 490 | } |
585f8587 FB |
491 | bs->backing_file[len] = '\0'; |
492 | } | |
42deb29f KW |
493 | |
494 | ret = qcow2_read_snapshots(bs); | |
495 | if (ret < 0) { | |
585f8587 | 496 | goto fail; |
6d85a57e | 497 | } |
585f8587 | 498 | |
af7b708d SH |
499 | /* Clear unknown autoclear feature bits */ |
500 | if (!bs->read_only && s->autoclear_features != 0) { | |
501 | s->autoclear_features = 0; | |
502 | ret = qcow2_update_header(bs); | |
503 | if (ret < 0) { | |
504 | goto fail; | |
505 | } | |
506 | } | |
507 | ||
68d100e9 KW |
508 | /* Initialise locks */ |
509 | qemu_co_mutex_init(&s->lock); | |
510 | ||
c61d0004 | 511 | /* Repair image if dirty */ |
058f8f16 SH |
512 | if (!(flags & BDRV_O_CHECK) && !bs->read_only && |
513 | (s->incompatible_features & QCOW2_INCOMPAT_DIRTY)) { | |
c61d0004 SH |
514 | BdrvCheckResult result = {0}; |
515 | ||
acbe5982 | 516 | ret = qcow2_check(bs, &result, BDRV_FIX_ERRORS); |
c61d0004 SH |
517 | if (ret < 0) { |
518 | goto fail; | |
519 | } | |
520 | } | |
521 | ||
74c4510a KW |
522 | /* Enable lazy_refcounts according to image and command line options */ |
523 | opts = qemu_opts_create_nofail(&qcow2_runtime_opts); | |
524 | qemu_opts_absorb_qdict(opts, options, &local_err); | |
525 | if (error_is_set(&local_err)) { | |
526 | qerror_report_err(local_err); | |
527 | error_free(local_err); | |
528 | ret = -EINVAL; | |
529 | goto fail; | |
530 | } | |
531 | ||
acdfb480 | 532 | s->use_lazy_refcounts = qemu_opt_get_bool(opts, QCOW2_OPT_LAZY_REFCOUNTS, |
74c4510a KW |
533 | (s->compatible_features & QCOW2_COMPAT_LAZY_REFCOUNTS)); |
534 | ||
535 | qemu_opts_del(opts); | |
536 | ||
537 | if (s->use_lazy_refcounts && s->qcow_version < 3) { | |
538 | qerror_report(ERROR_CLASS_GENERIC_ERROR, "Lazy refcounts require " | |
539 | "a qcow2 image with at least qemu 1.1 compatibility level"); | |
540 | ret = -EINVAL; | |
541 | goto fail; | |
542 | } | |
543 | ||
585f8587 | 544 | #ifdef DEBUG_ALLOC |
6cbc3031 PH |
545 | { |
546 | BdrvCheckResult result = {0}; | |
b35278f7 | 547 | qcow2_check_refcounts(bs, &result, 0); |
6cbc3031 | 548 | } |
585f8587 | 549 | #endif |
6d85a57e | 550 | return ret; |
585f8587 FB |
551 | |
552 | fail: | |
6744cbab | 553 | g_free(s->unknown_header_fields); |
75bab85c | 554 | cleanup_unknown_header_ext(bs); |
ed6ccf0f KW |
555 | qcow2_free_snapshots(bs); |
556 | qcow2_refcount_close(bs); | |
7267c094 | 557 | g_free(s->l1_table); |
29c1a730 KW |
558 | if (s->l2_table_cache) { |
559 | qcow2_cache_destroy(bs, s->l2_table_cache); | |
560 | } | |
7267c094 | 561 | g_free(s->cluster_cache); |
dea43a65 | 562 | qemu_vfree(s->cluster_data); |
6d85a57e | 563 | return ret; |
585f8587 FB |
564 | } |
565 | ||
7c80ab3f | 566 | static int qcow2_set_key(BlockDriverState *bs, const char *key) |
585f8587 FB |
567 | { |
568 | BDRVQcowState *s = bs->opaque; | |
569 | uint8_t keybuf[16]; | |
570 | int len, i; | |
3b46e624 | 571 | |
585f8587 FB |
572 | memset(keybuf, 0, 16); |
573 | len = strlen(key); | |
574 | if (len > 16) | |
575 | len = 16; | |
576 | /* XXX: we could compress the chars to 7 bits to increase | |
577 | entropy */ | |
578 | for(i = 0;i < len;i++) { | |
579 | keybuf[i] = key[i]; | |
580 | } | |
581 | s->crypt_method = s->crypt_method_header; | |
582 | ||
583 | if (AES_set_encrypt_key(keybuf, 128, &s->aes_encrypt_key) != 0) | |
584 | return -1; | |
585 | if (AES_set_decrypt_key(keybuf, 128, &s->aes_decrypt_key) != 0) | |
586 | return -1; | |
587 | #if 0 | |
588 | /* test */ | |
589 | { | |
590 | uint8_t in[16]; | |
591 | uint8_t out[16]; | |
592 | uint8_t tmp[16]; | |
593 | for(i=0;i<16;i++) | |
594 | in[i] = i; | |
595 | AES_encrypt(in, tmp, &s->aes_encrypt_key); | |
596 | AES_decrypt(tmp, out, &s->aes_decrypt_key); | |
597 | for(i = 0; i < 16; i++) | |
598 | printf(" %02x", tmp[i]); | |
599 | printf("\n"); | |
600 | for(i = 0; i < 16; i++) | |
601 | printf(" %02x", out[i]); | |
602 | printf("\n"); | |
603 | } | |
604 | #endif | |
605 | return 0; | |
606 | } | |
607 | ||
21d82ac9 JC |
608 | /* We have nothing to do for QCOW2 reopen, stubs just return |
609 | * success */ | |
610 | static int qcow2_reopen_prepare(BDRVReopenState *state, | |
611 | BlockReopenQueue *queue, Error **errp) | |
612 | { | |
613 | return 0; | |
614 | } | |
615 | ||
f8a2e5e3 SH |
616 | static int coroutine_fn qcow2_co_is_allocated(BlockDriverState *bs, |
617 | int64_t sector_num, int nb_sectors, int *pnum) | |
585f8587 | 618 | { |
f8a2e5e3 | 619 | BDRVQcowState *s = bs->opaque; |
585f8587 | 620 | uint64_t cluster_offset; |
1c46efaa | 621 | int ret; |
585f8587 | 622 | |
095a9c58 | 623 | *pnum = nb_sectors; |
f8a2e5e3 SH |
624 | /* FIXME We can get errors here, but the bdrv_co_is_allocated interface |
625 | * can't pass them on today */ | |
626 | qemu_co_mutex_lock(&s->lock); | |
1c46efaa | 627 | ret = qcow2_get_cluster_offset(bs, sector_num << 9, pnum, &cluster_offset); |
f8a2e5e3 | 628 | qemu_co_mutex_unlock(&s->lock); |
1c46efaa KW |
629 | if (ret < 0) { |
630 | *pnum = 0; | |
631 | } | |
095a9c58 | 632 | |
381b487d | 633 | return (cluster_offset != 0) || (ret == QCOW2_CLUSTER_ZERO); |
585f8587 FB |
634 | } |
635 | ||
a9465922 | 636 | /* handle reading after the end of the backing file */ |
bd28f835 KW |
637 | int qcow2_backing_read1(BlockDriverState *bs, QEMUIOVector *qiov, |
638 | int64_t sector_num, int nb_sectors) | |
a9465922 FB |
639 | { |
640 | int n1; | |
641 | if ((sector_num + nb_sectors) <= bs->total_sectors) | |
642 | return nb_sectors; | |
643 | if (sector_num >= bs->total_sectors) | |
644 | n1 = 0; | |
645 | else | |
646 | n1 = bs->total_sectors - sector_num; | |
bd28f835 | 647 | |
3d9b4925 | 648 | qemu_iovec_memset(qiov, 512 * n1, 0, 512 * (nb_sectors - n1)); |
bd28f835 | 649 | |
a9465922 FB |
650 | return n1; |
651 | } | |
652 | ||
a968168c | 653 | static coroutine_fn int qcow2_co_readv(BlockDriverState *bs, int64_t sector_num, |
3fc48d09 | 654 | int remaining_sectors, QEMUIOVector *qiov) |
585f8587 | 655 | { |
585f8587 | 656 | BDRVQcowState *s = bs->opaque; |
a9465922 | 657 | int index_in_cluster, n1; |
68d100e9 | 658 | int ret; |
faf575c1 | 659 | int cur_nr_sectors; /* number of sectors in current iteration */ |
c2bdd990 | 660 | uint64_t cluster_offset = 0; |
3fc48d09 FZ |
661 | uint64_t bytes_done = 0; |
662 | QEMUIOVector hd_qiov; | |
663 | uint8_t *cluster_data = NULL; | |
585f8587 | 664 | |
3fc48d09 FZ |
665 | qemu_iovec_init(&hd_qiov, qiov->niov); |
666 | ||
667 | qemu_co_mutex_lock(&s->lock); | |
668 | ||
669 | while (remaining_sectors != 0) { | |
bd28f835 | 670 | |
5ebaa27e | 671 | /* prepare next request */ |
3fc48d09 | 672 | cur_nr_sectors = remaining_sectors; |
5ebaa27e FZ |
673 | if (s->crypt_method) { |
674 | cur_nr_sectors = MIN(cur_nr_sectors, | |
675 | QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors); | |
585f8587 | 676 | } |
5ebaa27e | 677 | |
3fc48d09 | 678 | ret = qcow2_get_cluster_offset(bs, sector_num << 9, |
5ebaa27e | 679 | &cur_nr_sectors, &cluster_offset); |
8af36488 | 680 | if (ret < 0) { |
3fc48d09 | 681 | goto fail; |
8af36488 | 682 | } |
bd28f835 | 683 | |
3fc48d09 | 684 | index_in_cluster = sector_num & (s->cluster_sectors - 1); |
c87c0672 | 685 | |
3fc48d09 | 686 | qemu_iovec_reset(&hd_qiov); |
1b093c48 | 687 | qemu_iovec_concat(&hd_qiov, qiov, bytes_done, |
5ebaa27e FZ |
688 | cur_nr_sectors * 512); |
689 | ||
68d000a3 KW |
690 | switch (ret) { |
691 | case QCOW2_CLUSTER_UNALLOCATED: | |
5ebaa27e FZ |
692 | |
693 | if (bs->backing_hd) { | |
694 | /* read from the base image */ | |
3fc48d09 FZ |
695 | n1 = qcow2_backing_read1(bs->backing_hd, &hd_qiov, |
696 | sector_num, cur_nr_sectors); | |
5ebaa27e FZ |
697 | if (n1 > 0) { |
698 | BLKDBG_EVENT(bs->file, BLKDBG_READ_BACKING_AIO); | |
699 | qemu_co_mutex_unlock(&s->lock); | |
3fc48d09 FZ |
700 | ret = bdrv_co_readv(bs->backing_hd, sector_num, |
701 | n1, &hd_qiov); | |
5ebaa27e FZ |
702 | qemu_co_mutex_lock(&s->lock); |
703 | if (ret < 0) { | |
3fc48d09 | 704 | goto fail; |
5ebaa27e FZ |
705 | } |
706 | } | |
707 | } else { | |
708 | /* Note: in this case, no need to wait */ | |
3d9b4925 | 709 | qemu_iovec_memset(&hd_qiov, 0, 0, 512 * cur_nr_sectors); |
5ebaa27e | 710 | } |
68d000a3 KW |
711 | break; |
712 | ||
6377af48 | 713 | case QCOW2_CLUSTER_ZERO: |
3d9b4925 | 714 | qemu_iovec_memset(&hd_qiov, 0, 0, 512 * cur_nr_sectors); |
6377af48 KW |
715 | break; |
716 | ||
68d000a3 | 717 | case QCOW2_CLUSTER_COMPRESSED: |
5ebaa27e FZ |
718 | /* add AIO support for compressed blocks ? */ |
719 | ret = qcow2_decompress_cluster(bs, cluster_offset); | |
720 | if (ret < 0) { | |
3fc48d09 | 721 | goto fail; |
bd28f835 KW |
722 | } |
723 | ||
03396148 | 724 | qemu_iovec_from_buf(&hd_qiov, 0, |
5ebaa27e | 725 | s->cluster_cache + index_in_cluster * 512, |
faf575c1 | 726 | 512 * cur_nr_sectors); |
68d000a3 KW |
727 | break; |
728 | ||
729 | case QCOW2_CLUSTER_NORMAL: | |
5ebaa27e | 730 | if ((cluster_offset & 511) != 0) { |
3fc48d09 FZ |
731 | ret = -EIO; |
732 | goto fail; | |
5ebaa27e | 733 | } |
bd28f835 | 734 | |
5ebaa27e FZ |
735 | if (s->crypt_method) { |
736 | /* | |
737 | * For encrypted images, read everything into a temporary | |
738 | * contiguous buffer on which the AES functions can work. | |
739 | */ | |
3fc48d09 FZ |
740 | if (!cluster_data) { |
741 | cluster_data = | |
dea43a65 | 742 | qemu_blockalign(bs, QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size); |
5ebaa27e FZ |
743 | } |
744 | ||
745 | assert(cur_nr_sectors <= | |
746 | QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors); | |
3fc48d09 FZ |
747 | qemu_iovec_reset(&hd_qiov); |
748 | qemu_iovec_add(&hd_qiov, cluster_data, | |
5ebaa27e FZ |
749 | 512 * cur_nr_sectors); |
750 | } | |
751 | ||
752 | BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO); | |
753 | qemu_co_mutex_unlock(&s->lock); | |
754 | ret = bdrv_co_readv(bs->file, | |
755 | (cluster_offset >> 9) + index_in_cluster, | |
3fc48d09 | 756 | cur_nr_sectors, &hd_qiov); |
5ebaa27e FZ |
757 | qemu_co_mutex_lock(&s->lock); |
758 | if (ret < 0) { | |
3fc48d09 | 759 | goto fail; |
5ebaa27e FZ |
760 | } |
761 | if (s->crypt_method) { | |
3fc48d09 FZ |
762 | qcow2_encrypt_sectors(s, sector_num, cluster_data, |
763 | cluster_data, cur_nr_sectors, 0, &s->aes_decrypt_key); | |
03396148 MT |
764 | qemu_iovec_from_buf(qiov, bytes_done, |
765 | cluster_data, 512 * cur_nr_sectors); | |
5ebaa27e | 766 | } |
68d000a3 KW |
767 | break; |
768 | ||
769 | default: | |
770 | g_assert_not_reached(); | |
771 | ret = -EIO; | |
772 | goto fail; | |
faf575c1 | 773 | } |
f141eafe | 774 | |
3fc48d09 FZ |
775 | remaining_sectors -= cur_nr_sectors; |
776 | sector_num += cur_nr_sectors; | |
777 | bytes_done += cur_nr_sectors * 512; | |
5ebaa27e | 778 | } |
3fc48d09 | 779 | ret = 0; |
faf575c1 | 780 | |
3fc48d09 | 781 | fail: |
68d100e9 | 782 | qemu_co_mutex_unlock(&s->lock); |
42496d62 | 783 | |
3fc48d09 | 784 | qemu_iovec_destroy(&hd_qiov); |
dea43a65 | 785 | qemu_vfree(cluster_data); |
68d100e9 KW |
786 | |
787 | return ret; | |
585f8587 FB |
788 | } |
789 | ||
a968168c | 790 | static coroutine_fn int qcow2_co_writev(BlockDriverState *bs, |
3fc48d09 FZ |
791 | int64_t sector_num, |
792 | int remaining_sectors, | |
793 | QEMUIOVector *qiov) | |
585f8587 | 794 | { |
585f8587 | 795 | BDRVQcowState *s = bs->opaque; |
585f8587 | 796 | int index_in_cluster; |
095a9c58 | 797 | int n_end; |
68d100e9 | 798 | int ret; |
faf575c1 | 799 | int cur_nr_sectors; /* number of sectors in current iteration */ |
c2bdd990 | 800 | uint64_t cluster_offset; |
3fc48d09 FZ |
801 | QEMUIOVector hd_qiov; |
802 | uint64_t bytes_done = 0; | |
803 | uint8_t *cluster_data = NULL; | |
8d2497c3 | 804 | QCowL2Meta *l2meta = NULL; |
c2271403 | 805 | |
3cce16f4 KW |
806 | trace_qcow2_writev_start_req(qemu_coroutine_self(), sector_num, |
807 | remaining_sectors); | |
808 | ||
3fc48d09 FZ |
809 | qemu_iovec_init(&hd_qiov, qiov->niov); |
810 | ||
811 | s->cluster_cache_offset = -1; /* disable compressed cache */ | |
3b46e624 | 812 | |
3fc48d09 FZ |
813 | qemu_co_mutex_lock(&s->lock); |
814 | ||
815 | while (remaining_sectors != 0) { | |
816 | ||
f50f88b9 | 817 | l2meta = NULL; |
cf5c1a23 | 818 | |
3cce16f4 | 819 | trace_qcow2_writev_start_part(qemu_coroutine_self()); |
3fc48d09 FZ |
820 | index_in_cluster = sector_num & (s->cluster_sectors - 1); |
821 | n_end = index_in_cluster + remaining_sectors; | |
5ebaa27e FZ |
822 | if (s->crypt_method && |
823 | n_end > QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors) { | |
824 | n_end = QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors; | |
825 | } | |
095a9c58 | 826 | |
3fc48d09 | 827 | ret = qcow2_alloc_cluster_offset(bs, sector_num << 9, |
f50f88b9 | 828 | index_in_cluster, n_end, &cur_nr_sectors, &cluster_offset, &l2meta); |
5ebaa27e | 829 | if (ret < 0) { |
3fc48d09 | 830 | goto fail; |
5ebaa27e | 831 | } |
148da7ea | 832 | |
5ebaa27e | 833 | assert((cluster_offset & 511) == 0); |
148da7ea | 834 | |
3fc48d09 | 835 | qemu_iovec_reset(&hd_qiov); |
1b093c48 | 836 | qemu_iovec_concat(&hd_qiov, qiov, bytes_done, |
5ebaa27e | 837 | cur_nr_sectors * 512); |
6f5f060b | 838 | |
5ebaa27e | 839 | if (s->crypt_method) { |
3fc48d09 | 840 | if (!cluster_data) { |
dea43a65 | 841 | cluster_data = qemu_blockalign(bs, QCOW_MAX_CRYPT_CLUSTERS * |
5ebaa27e FZ |
842 | s->cluster_size); |
843 | } | |
6f5f060b | 844 | |
3fc48d09 | 845 | assert(hd_qiov.size <= |
5ebaa27e | 846 | QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size); |
d5e6b161 | 847 | qemu_iovec_to_buf(&hd_qiov, 0, cluster_data, hd_qiov.size); |
6f5f060b | 848 | |
3fc48d09 FZ |
849 | qcow2_encrypt_sectors(s, sector_num, cluster_data, |
850 | cluster_data, cur_nr_sectors, 1, &s->aes_encrypt_key); | |
6f5f060b | 851 | |
3fc48d09 FZ |
852 | qemu_iovec_reset(&hd_qiov); |
853 | qemu_iovec_add(&hd_qiov, cluster_data, | |
5ebaa27e FZ |
854 | cur_nr_sectors * 512); |
855 | } | |
6f5f060b | 856 | |
5ebaa27e | 857 | qemu_co_mutex_unlock(&s->lock); |
67a7a0eb | 858 | BLKDBG_EVENT(bs->file, BLKDBG_WRITE_AIO); |
3cce16f4 KW |
859 | trace_qcow2_writev_data(qemu_coroutine_self(), |
860 | (cluster_offset >> 9) + index_in_cluster); | |
5ebaa27e FZ |
861 | ret = bdrv_co_writev(bs->file, |
862 | (cluster_offset >> 9) + index_in_cluster, | |
3fc48d09 | 863 | cur_nr_sectors, &hd_qiov); |
5ebaa27e FZ |
864 | qemu_co_mutex_lock(&s->lock); |
865 | if (ret < 0) { | |
3fc48d09 | 866 | goto fail; |
5ebaa27e | 867 | } |
f141eafe | 868 | |
88c6588c KW |
869 | while (l2meta != NULL) { |
870 | QCowL2Meta *next; | |
871 | ||
f50f88b9 KW |
872 | ret = qcow2_alloc_cluster_link_l2(bs, l2meta); |
873 | if (ret < 0) { | |
874 | goto fail; | |
875 | } | |
faf575c1 | 876 | |
4e95314e KW |
877 | /* Take the request off the list of running requests */ |
878 | if (l2meta->nb_clusters != 0) { | |
879 | QLIST_REMOVE(l2meta, next_in_flight); | |
880 | } | |
881 | ||
4e95314e | 882 | qemu_co_queue_restart_all(&l2meta->dependent_requests); |
4e95314e | 883 | |
88c6588c | 884 | next = l2meta->next; |
f50f88b9 | 885 | g_free(l2meta); |
88c6588c | 886 | l2meta = next; |
f50f88b9 | 887 | } |
0fa9131a | 888 | |
3fc48d09 FZ |
889 | remaining_sectors -= cur_nr_sectors; |
890 | sector_num += cur_nr_sectors; | |
891 | bytes_done += cur_nr_sectors * 512; | |
3cce16f4 | 892 | trace_qcow2_writev_done_part(qemu_coroutine_self(), cur_nr_sectors); |
5ebaa27e | 893 | } |
3fc48d09 | 894 | ret = 0; |
faf575c1 | 895 | |
3fc48d09 | 896 | fail: |
4e95314e KW |
897 | qemu_co_mutex_unlock(&s->lock); |
898 | ||
88c6588c KW |
899 | while (l2meta != NULL) { |
900 | QCowL2Meta *next; | |
901 | ||
4e95314e KW |
902 | if (l2meta->nb_clusters != 0) { |
903 | QLIST_REMOVE(l2meta, next_in_flight); | |
904 | } | |
905 | qemu_co_queue_restart_all(&l2meta->dependent_requests); | |
88c6588c KW |
906 | |
907 | next = l2meta->next; | |
cf5c1a23 | 908 | g_free(l2meta); |
88c6588c | 909 | l2meta = next; |
cf5c1a23 | 910 | } |
0fa9131a | 911 | |
3fc48d09 | 912 | qemu_iovec_destroy(&hd_qiov); |
dea43a65 | 913 | qemu_vfree(cluster_data); |
3cce16f4 | 914 | trace_qcow2_writev_done_req(qemu_coroutine_self(), ret); |
42496d62 | 915 | |
68d100e9 | 916 | return ret; |
585f8587 FB |
917 | } |
918 | ||
7c80ab3f | 919 | static void qcow2_close(BlockDriverState *bs) |
585f8587 FB |
920 | { |
921 | BDRVQcowState *s = bs->opaque; | |
7267c094 | 922 | g_free(s->l1_table); |
29c1a730 KW |
923 | |
924 | qcow2_cache_flush(bs, s->l2_table_cache); | |
925 | qcow2_cache_flush(bs, s->refcount_block_cache); | |
926 | ||
c61d0004 SH |
927 | qcow2_mark_clean(bs); |
928 | ||
29c1a730 KW |
929 | qcow2_cache_destroy(bs, s->l2_table_cache); |
930 | qcow2_cache_destroy(bs, s->refcount_block_cache); | |
931 | ||
6744cbab | 932 | g_free(s->unknown_header_fields); |
75bab85c | 933 | cleanup_unknown_header_ext(bs); |
6744cbab | 934 | |
7267c094 | 935 | g_free(s->cluster_cache); |
dea43a65 | 936 | qemu_vfree(s->cluster_data); |
ed6ccf0f | 937 | qcow2_refcount_close(bs); |
28c1202b | 938 | qcow2_free_snapshots(bs); |
585f8587 FB |
939 | } |
940 | ||
06d9260f AL |
941 | static void qcow2_invalidate_cache(BlockDriverState *bs) |
942 | { | |
943 | BDRVQcowState *s = bs->opaque; | |
944 | int flags = s->flags; | |
945 | AES_KEY aes_encrypt_key; | |
946 | AES_KEY aes_decrypt_key; | |
947 | uint32_t crypt_method = 0; | |
acdfb480 | 948 | QDict *options; |
06d9260f AL |
949 | |
950 | /* | |
951 | * Backing files are read-only which makes all of their metadata immutable, | |
952 | * that means we don't have to worry about reopening them here. | |
953 | */ | |
954 | ||
955 | if (s->crypt_method) { | |
956 | crypt_method = s->crypt_method; | |
957 | memcpy(&aes_encrypt_key, &s->aes_encrypt_key, sizeof(aes_encrypt_key)); | |
958 | memcpy(&aes_decrypt_key, &s->aes_decrypt_key, sizeof(aes_decrypt_key)); | |
959 | } | |
960 | ||
961 | qcow2_close(bs); | |
962 | ||
acdfb480 KW |
963 | options = qdict_new(); |
964 | qdict_put(options, QCOW2_OPT_LAZY_REFCOUNTS, | |
965 | qbool_from_int(s->use_lazy_refcounts)); | |
966 | ||
06d9260f | 967 | memset(s, 0, sizeof(BDRVQcowState)); |
acdfb480 KW |
968 | qcow2_open(bs, options, flags); |
969 | ||
970 | QDECREF(options); | |
06d9260f AL |
971 | |
972 | if (crypt_method) { | |
973 | s->crypt_method = crypt_method; | |
974 | memcpy(&s->aes_encrypt_key, &aes_encrypt_key, sizeof(aes_encrypt_key)); | |
975 | memcpy(&s->aes_decrypt_key, &aes_decrypt_key, sizeof(aes_decrypt_key)); | |
976 | } | |
977 | } | |
978 | ||
e24e49e6 KW |
979 | static size_t header_ext_add(char *buf, uint32_t magic, const void *s, |
980 | size_t len, size_t buflen) | |
981 | { | |
982 | QCowExtension *ext_backing_fmt = (QCowExtension*) buf; | |
983 | size_t ext_len = sizeof(QCowExtension) + ((len + 7) & ~7); | |
984 | ||
985 | if (buflen < ext_len) { | |
986 | return -ENOSPC; | |
987 | } | |
988 | ||
989 | *ext_backing_fmt = (QCowExtension) { | |
990 | .magic = cpu_to_be32(magic), | |
991 | .len = cpu_to_be32(len), | |
992 | }; | |
993 | memcpy(buf + sizeof(QCowExtension), s, len); | |
994 | ||
995 | return ext_len; | |
996 | } | |
997 | ||
756e6736 | 998 | /* |
e24e49e6 KW |
999 | * Updates the qcow2 header, including the variable length parts of it, i.e. |
1000 | * the backing file name and all extensions. qcow2 was not designed to allow | |
1001 | * such changes, so if we run out of space (we can only use the first cluster) | |
1002 | * this function may fail. | |
756e6736 KW |
1003 | * |
1004 | * Returns 0 on success, -errno in error cases. | |
1005 | */ | |
e24e49e6 | 1006 | int qcow2_update_header(BlockDriverState *bs) |
756e6736 | 1007 | { |
756e6736 | 1008 | BDRVQcowState *s = bs->opaque; |
e24e49e6 KW |
1009 | QCowHeader *header; |
1010 | char *buf; | |
1011 | size_t buflen = s->cluster_size; | |
756e6736 | 1012 | int ret; |
e24e49e6 KW |
1013 | uint64_t total_size; |
1014 | uint32_t refcount_table_clusters; | |
6744cbab | 1015 | size_t header_length; |
75bab85c | 1016 | Qcow2UnknownHeaderExtension *uext; |
756e6736 | 1017 | |
e24e49e6 | 1018 | buf = qemu_blockalign(bs, buflen); |
756e6736 | 1019 | |
e24e49e6 KW |
1020 | /* Header structure */ |
1021 | header = (QCowHeader*) buf; | |
756e6736 | 1022 | |
e24e49e6 KW |
1023 | if (buflen < sizeof(*header)) { |
1024 | ret = -ENOSPC; | |
1025 | goto fail; | |
756e6736 KW |
1026 | } |
1027 | ||
6744cbab | 1028 | header_length = sizeof(*header) + s->unknown_header_fields_size; |
e24e49e6 KW |
1029 | total_size = bs->total_sectors * BDRV_SECTOR_SIZE; |
1030 | refcount_table_clusters = s->refcount_table_size >> (s->cluster_bits - 3); | |
1031 | ||
1032 | *header = (QCowHeader) { | |
6744cbab | 1033 | /* Version 2 fields */ |
e24e49e6 | 1034 | .magic = cpu_to_be32(QCOW_MAGIC), |
6744cbab | 1035 | .version = cpu_to_be32(s->qcow_version), |
e24e49e6 KW |
1036 | .backing_file_offset = 0, |
1037 | .backing_file_size = 0, | |
1038 | .cluster_bits = cpu_to_be32(s->cluster_bits), | |
1039 | .size = cpu_to_be64(total_size), | |
1040 | .crypt_method = cpu_to_be32(s->crypt_method_header), | |
1041 | .l1_size = cpu_to_be32(s->l1_size), | |
1042 | .l1_table_offset = cpu_to_be64(s->l1_table_offset), | |
1043 | .refcount_table_offset = cpu_to_be64(s->refcount_table_offset), | |
1044 | .refcount_table_clusters = cpu_to_be32(refcount_table_clusters), | |
1045 | .nb_snapshots = cpu_to_be32(s->nb_snapshots), | |
1046 | .snapshots_offset = cpu_to_be64(s->snapshots_offset), | |
6744cbab KW |
1047 | |
1048 | /* Version 3 fields */ | |
1049 | .incompatible_features = cpu_to_be64(s->incompatible_features), | |
1050 | .compatible_features = cpu_to_be64(s->compatible_features), | |
1051 | .autoclear_features = cpu_to_be64(s->autoclear_features), | |
1052 | .refcount_order = cpu_to_be32(3 + REFCOUNT_SHIFT), | |
1053 | .header_length = cpu_to_be32(header_length), | |
e24e49e6 | 1054 | }; |
756e6736 | 1055 | |
6744cbab KW |
1056 | /* For older versions, write a shorter header */ |
1057 | switch (s->qcow_version) { | |
1058 | case 2: | |
1059 | ret = offsetof(QCowHeader, incompatible_features); | |
1060 | break; | |
1061 | case 3: | |
1062 | ret = sizeof(*header); | |
1063 | break; | |
1064 | default: | |
b6c14762 JM |
1065 | ret = -EINVAL; |
1066 | goto fail; | |
6744cbab KW |
1067 | } |
1068 | ||
1069 | buf += ret; | |
1070 | buflen -= ret; | |
1071 | memset(buf, 0, buflen); | |
1072 | ||
1073 | /* Preserve any unknown field in the header */ | |
1074 | if (s->unknown_header_fields_size) { | |
1075 | if (buflen < s->unknown_header_fields_size) { | |
1076 | ret = -ENOSPC; | |
1077 | goto fail; | |
1078 | } | |
1079 | ||
1080 | memcpy(buf, s->unknown_header_fields, s->unknown_header_fields_size); | |
1081 | buf += s->unknown_header_fields_size; | |
1082 | buflen -= s->unknown_header_fields_size; | |
1083 | } | |
756e6736 | 1084 | |
e24e49e6 KW |
1085 | /* Backing file format header extension */ |
1086 | if (*bs->backing_format) { | |
1087 | ret = header_ext_add(buf, QCOW2_EXT_MAGIC_BACKING_FORMAT, | |
1088 | bs->backing_format, strlen(bs->backing_format), | |
1089 | buflen); | |
1090 | if (ret < 0) { | |
1091 | goto fail; | |
756e6736 KW |
1092 | } |
1093 | ||
e24e49e6 KW |
1094 | buf += ret; |
1095 | buflen -= ret; | |
756e6736 KW |
1096 | } |
1097 | ||
cfcc4c62 KW |
1098 | /* Feature table */ |
1099 | Qcow2Feature features[] = { | |
c61d0004 SH |
1100 | { |
1101 | .type = QCOW2_FEAT_TYPE_INCOMPATIBLE, | |
1102 | .bit = QCOW2_INCOMPAT_DIRTY_BITNR, | |
1103 | .name = "dirty bit", | |
1104 | }, | |
bfe8043e SH |
1105 | { |
1106 | .type = QCOW2_FEAT_TYPE_COMPATIBLE, | |
1107 | .bit = QCOW2_COMPAT_LAZY_REFCOUNTS_BITNR, | |
1108 | .name = "lazy refcounts", | |
1109 | }, | |
cfcc4c62 KW |
1110 | }; |
1111 | ||
1112 | ret = header_ext_add(buf, QCOW2_EXT_MAGIC_FEATURE_TABLE, | |
1113 | features, sizeof(features), buflen); | |
1114 | if (ret < 0) { | |
1115 | goto fail; | |
1116 | } | |
1117 | buf += ret; | |
1118 | buflen -= ret; | |
1119 | ||
75bab85c KW |
1120 | /* Keep unknown header extensions */ |
1121 | QLIST_FOREACH(uext, &s->unknown_header_ext, next) { | |
1122 | ret = header_ext_add(buf, uext->magic, uext->data, uext->len, buflen); | |
1123 | if (ret < 0) { | |
1124 | goto fail; | |
1125 | } | |
1126 | ||
1127 | buf += ret; | |
1128 | buflen -= ret; | |
1129 | } | |
1130 | ||
e24e49e6 KW |
1131 | /* End of header extensions */ |
1132 | ret = header_ext_add(buf, QCOW2_EXT_MAGIC_END, NULL, 0, buflen); | |
756e6736 KW |
1133 | if (ret < 0) { |
1134 | goto fail; | |
1135 | } | |
1136 | ||
e24e49e6 KW |
1137 | buf += ret; |
1138 | buflen -= ret; | |
756e6736 | 1139 | |
e24e49e6 KW |
1140 | /* Backing file name */ |
1141 | if (*bs->backing_file) { | |
1142 | size_t backing_file_len = strlen(bs->backing_file); | |
1143 | ||
1144 | if (buflen < backing_file_len) { | |
1145 | ret = -ENOSPC; | |
1146 | goto fail; | |
1147 | } | |
1148 | ||
00ea1881 | 1149 | /* Using strncpy is ok here, since buf is not NUL-terminated. */ |
e24e49e6 KW |
1150 | strncpy(buf, bs->backing_file, buflen); |
1151 | ||
1152 | header->backing_file_offset = cpu_to_be64(buf - ((char*) header)); | |
1153 | header->backing_file_size = cpu_to_be32(backing_file_len); | |
756e6736 KW |
1154 | } |
1155 | ||
e24e49e6 KW |
1156 | /* Write the new header */ |
1157 | ret = bdrv_pwrite(bs->file, 0, header, s->cluster_size); | |
756e6736 KW |
1158 | if (ret < 0) { |
1159 | goto fail; | |
1160 | } | |
1161 | ||
1162 | ret = 0; | |
1163 | fail: | |
e24e49e6 | 1164 | qemu_vfree(header); |
756e6736 KW |
1165 | return ret; |
1166 | } | |
1167 | ||
1168 | static int qcow2_change_backing_file(BlockDriverState *bs, | |
1169 | const char *backing_file, const char *backing_fmt) | |
1170 | { | |
e24e49e6 KW |
1171 | pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: ""); |
1172 | pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: ""); | |
1173 | ||
1174 | return qcow2_update_header(bs); | |
756e6736 KW |
1175 | } |
1176 | ||
a35e1c17 KW |
1177 | static int preallocate(BlockDriverState *bs) |
1178 | { | |
a35e1c17 KW |
1179 | uint64_t nb_sectors; |
1180 | uint64_t offset; | |
060bee89 | 1181 | uint64_t host_offset = 0; |
a35e1c17 | 1182 | int num; |
148da7ea | 1183 | int ret; |
f50f88b9 | 1184 | QCowL2Meta *meta; |
a35e1c17 KW |
1185 | |
1186 | nb_sectors = bdrv_getlength(bs) >> 9; | |
1187 | offset = 0; | |
1188 | ||
1189 | while (nb_sectors) { | |
1190 | num = MIN(nb_sectors, INT_MAX >> 9); | |
060bee89 KW |
1191 | ret = qcow2_alloc_cluster_offset(bs, offset, 0, num, &num, |
1192 | &host_offset, &meta); | |
148da7ea | 1193 | if (ret < 0) { |
19dbcbf7 | 1194 | return ret; |
a35e1c17 KW |
1195 | } |
1196 | ||
f50f88b9 | 1197 | ret = qcow2_alloc_cluster_link_l2(bs, meta); |
19dbcbf7 | 1198 | if (ret < 0) { |
f50f88b9 | 1199 | qcow2_free_any_clusters(bs, meta->alloc_offset, meta->nb_clusters); |
19dbcbf7 | 1200 | return ret; |
a35e1c17 KW |
1201 | } |
1202 | ||
f214978a KW |
1203 | /* There are no dependent requests, but we need to remove our request |
1204 | * from the list of in-flight requests */ | |
f50f88b9 | 1205 | if (meta != NULL) { |
4e95314e | 1206 | QLIST_REMOVE(meta, next_in_flight); |
f50f88b9 | 1207 | } |
f214978a | 1208 | |
a35e1c17 KW |
1209 | /* TODO Preallocate data if requested */ |
1210 | ||
1211 | nb_sectors -= num; | |
1212 | offset += num << 9; | |
1213 | } | |
1214 | ||
1215 | /* | |
1216 | * It is expected that the image file is large enough to actually contain | |
1217 | * all of the allocated clusters (otherwise we get failing reads after | |
1218 | * EOF). Extend the image to the last allocated sector. | |
1219 | */ | |
060bee89 | 1220 | if (host_offset != 0) { |
ea80b906 KW |
1221 | uint8_t buf[512]; |
1222 | memset(buf, 0, 512); | |
060bee89 | 1223 | ret = bdrv_write(bs->file, (host_offset >> 9) + num - 1, buf, 1); |
19dbcbf7 KW |
1224 | if (ret < 0) { |
1225 | return ret; | |
1226 | } | |
a35e1c17 KW |
1227 | } |
1228 | ||
1229 | return 0; | |
1230 | } | |
1231 | ||
7c80ab3f JS |
1232 | static int qcow2_create2(const char *filename, int64_t total_size, |
1233 | const char *backing_file, const char *backing_format, | |
1234 | int flags, size_t cluster_size, int prealloc, | |
6744cbab | 1235 | QEMUOptionParameter *options, int version) |
a9420734 | 1236 | { |
9b2260cb | 1237 | /* Calculate cluster_bits */ |
a9420734 KW |
1238 | int cluster_bits; |
1239 | cluster_bits = ffs(cluster_size) - 1; | |
1240 | if (cluster_bits < MIN_CLUSTER_BITS || cluster_bits > MAX_CLUSTER_BITS || | |
1241 | (1 << cluster_bits) != cluster_size) | |
1242 | { | |
1243 | error_report( | |
6daf194d | 1244 | "Cluster size must be a power of two between %d and %dk", |
a9420734 KW |
1245 | 1 << MIN_CLUSTER_BITS, 1 << (MAX_CLUSTER_BITS - 10)); |
1246 | return -EINVAL; | |
1247 | } | |
1248 | ||
1249 | /* | |
1250 | * Open the image file and write a minimal qcow2 header. | |
1251 | * | |
1252 | * We keep things simple and start with a zero-sized image. We also | |
1253 | * do without refcount blocks or a L1 table for now. We'll fix the | |
1254 | * inconsistency later. | |
1255 | * | |
1256 | * We do need a refcount table because growing the refcount table means | |
1257 | * allocating two new refcount blocks - the seconds of which would be at | |
1258 | * 2 GB for 64k clusters, and we don't want to have a 2 GB initial file | |
1259 | * size for any qcow2 image. | |
1260 | */ | |
1261 | BlockDriverState* bs; | |
1262 | QCowHeader header; | |
1263 | uint8_t* refcount_table; | |
1264 | int ret; | |
1265 | ||
1266 | ret = bdrv_create_file(filename, options); | |
1267 | if (ret < 0) { | |
1268 | return ret; | |
1269 | } | |
1270 | ||
787e4a85 | 1271 | ret = bdrv_file_open(&bs, filename, NULL, BDRV_O_RDWR); |
a9420734 KW |
1272 | if (ret < 0) { |
1273 | return ret; | |
1274 | } | |
1275 | ||
1276 | /* Write the header */ | |
1277 | memset(&header, 0, sizeof(header)); | |
1278 | header.magic = cpu_to_be32(QCOW_MAGIC); | |
6744cbab | 1279 | header.version = cpu_to_be32(version); |
a9420734 KW |
1280 | header.cluster_bits = cpu_to_be32(cluster_bits); |
1281 | header.size = cpu_to_be64(0); | |
1282 | header.l1_table_offset = cpu_to_be64(0); | |
1283 | header.l1_size = cpu_to_be32(0); | |
1284 | header.refcount_table_offset = cpu_to_be64(cluster_size); | |
1285 | header.refcount_table_clusters = cpu_to_be32(1); | |
6744cbab KW |
1286 | header.refcount_order = cpu_to_be32(3 + REFCOUNT_SHIFT); |
1287 | header.header_length = cpu_to_be32(sizeof(header)); | |
a9420734 KW |
1288 | |
1289 | if (flags & BLOCK_FLAG_ENCRYPT) { | |
1290 | header.crypt_method = cpu_to_be32(QCOW_CRYPT_AES); | |
1291 | } else { | |
1292 | header.crypt_method = cpu_to_be32(QCOW_CRYPT_NONE); | |
1293 | } | |
1294 | ||
bfe8043e SH |
1295 | if (flags & BLOCK_FLAG_LAZY_REFCOUNTS) { |
1296 | header.compatible_features |= | |
1297 | cpu_to_be64(QCOW2_COMPAT_LAZY_REFCOUNTS); | |
1298 | } | |
1299 | ||
a9420734 KW |
1300 | ret = bdrv_pwrite(bs, 0, &header, sizeof(header)); |
1301 | if (ret < 0) { | |
1302 | goto out; | |
1303 | } | |
1304 | ||
1305 | /* Write an empty refcount table */ | |
7267c094 | 1306 | refcount_table = g_malloc0(cluster_size); |
a9420734 | 1307 | ret = bdrv_pwrite(bs, cluster_size, refcount_table, cluster_size); |
7267c094 | 1308 | g_free(refcount_table); |
a9420734 KW |
1309 | |
1310 | if (ret < 0) { | |
1311 | goto out; | |
1312 | } | |
1313 | ||
1314 | bdrv_close(bs); | |
1315 | ||
1316 | /* | |
1317 | * And now open the image and make it consistent first (i.e. increase the | |
1318 | * refcount of the cluster that is occupied by the header and the refcount | |
1319 | * table) | |
1320 | */ | |
1321 | BlockDriver* drv = bdrv_find_format("qcow2"); | |
1322 | assert(drv != NULL); | |
de9c0cec | 1323 | ret = bdrv_open(bs, filename, NULL, |
e1a7107f | 1324 | BDRV_O_RDWR | BDRV_O_CACHE_WB | BDRV_O_NO_FLUSH, drv); |
a9420734 KW |
1325 | if (ret < 0) { |
1326 | goto out; | |
1327 | } | |
1328 | ||
1329 | ret = qcow2_alloc_clusters(bs, 2 * cluster_size); | |
1330 | if (ret < 0) { | |
1331 | goto out; | |
1332 | ||
1333 | } else if (ret != 0) { | |
1334 | error_report("Huh, first cluster in empty image is already in use?"); | |
1335 | abort(); | |
1336 | } | |
1337 | ||
1338 | /* Okay, now that we have a valid image, let's give it the right size */ | |
1339 | ret = bdrv_truncate(bs, total_size * BDRV_SECTOR_SIZE); | |
1340 | if (ret < 0) { | |
1341 | goto out; | |
1342 | } | |
1343 | ||
1344 | /* Want a backing file? There you go.*/ | |
1345 | if (backing_file) { | |
1346 | ret = bdrv_change_backing_file(bs, backing_file, backing_format); | |
1347 | if (ret < 0) { | |
1348 | goto out; | |
1349 | } | |
1350 | } | |
1351 | ||
1352 | /* And if we're supposed to preallocate metadata, do that now */ | |
1353 | if (prealloc) { | |
15552c4a ZYW |
1354 | BDRVQcowState *s = bs->opaque; |
1355 | qemu_co_mutex_lock(&s->lock); | |
a9420734 | 1356 | ret = preallocate(bs); |
15552c4a | 1357 | qemu_co_mutex_unlock(&s->lock); |
a9420734 KW |
1358 | if (ret < 0) { |
1359 | goto out; | |
1360 | } | |
1361 | } | |
1362 | ||
1363 | ret = 0; | |
1364 | out: | |
1365 | bdrv_delete(bs); | |
1366 | return ret; | |
1367 | } | |
de5f3f40 | 1368 | |
7c80ab3f | 1369 | static int qcow2_create(const char *filename, QEMUOptionParameter *options) |
de5f3f40 KW |
1370 | { |
1371 | const char *backing_file = NULL; | |
1372 | const char *backing_fmt = NULL; | |
1373 | uint64_t sectors = 0; | |
1374 | int flags = 0; | |
99cce9fa | 1375 | size_t cluster_size = DEFAULT_CLUSTER_SIZE; |
de5f3f40 | 1376 | int prealloc = 0; |
6744cbab | 1377 | int version = 2; |
de5f3f40 KW |
1378 | |
1379 | /* Read out options */ | |
1380 | while (options && options->name) { | |
1381 | if (!strcmp(options->name, BLOCK_OPT_SIZE)) { | |
1382 | sectors = options->value.n / 512; | |
1383 | } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) { | |
1384 | backing_file = options->value.s; | |
1385 | } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FMT)) { | |
1386 | backing_fmt = options->value.s; | |
1387 | } else if (!strcmp(options->name, BLOCK_OPT_ENCRYPT)) { | |
1388 | flags |= options->value.n ? BLOCK_FLAG_ENCRYPT : 0; | |
1389 | } else if (!strcmp(options->name, BLOCK_OPT_CLUSTER_SIZE)) { | |
1390 | if (options->value.n) { | |
1391 | cluster_size = options->value.n; | |
1392 | } | |
1393 | } else if (!strcmp(options->name, BLOCK_OPT_PREALLOC)) { | |
1394 | if (!options->value.s || !strcmp(options->value.s, "off")) { | |
1395 | prealloc = 0; | |
1396 | } else if (!strcmp(options->value.s, "metadata")) { | |
1397 | prealloc = 1; | |
1398 | } else { | |
1399 | fprintf(stderr, "Invalid preallocation mode: '%s'\n", | |
1400 | options->value.s); | |
1401 | return -EINVAL; | |
1402 | } | |
6744cbab KW |
1403 | } else if (!strcmp(options->name, BLOCK_OPT_COMPAT_LEVEL)) { |
1404 | if (!options->value.s || !strcmp(options->value.s, "0.10")) { | |
1405 | version = 2; | |
1406 | } else if (!strcmp(options->value.s, "1.1")) { | |
1407 | version = 3; | |
1408 | } else { | |
1409 | fprintf(stderr, "Invalid compatibility level: '%s'\n", | |
1410 | options->value.s); | |
1411 | return -EINVAL; | |
1412 | } | |
bfe8043e SH |
1413 | } else if (!strcmp(options->name, BLOCK_OPT_LAZY_REFCOUNTS)) { |
1414 | flags |= options->value.n ? BLOCK_FLAG_LAZY_REFCOUNTS : 0; | |
de5f3f40 KW |
1415 | } |
1416 | options++; | |
1417 | } | |
1418 | ||
1419 | if (backing_file && prealloc) { | |
1420 | fprintf(stderr, "Backing file and preallocation cannot be used at " | |
1421 | "the same time\n"); | |
1422 | return -EINVAL; | |
1423 | } | |
1424 | ||
bfe8043e SH |
1425 | if (version < 3 && (flags & BLOCK_FLAG_LAZY_REFCOUNTS)) { |
1426 | fprintf(stderr, "Lazy refcounts only supported with compatibility " | |
1427 | "level 1.1 and above (use compat=1.1 or greater)\n"); | |
1428 | return -EINVAL; | |
1429 | } | |
1430 | ||
7c80ab3f | 1431 | return qcow2_create2(filename, sectors, backing_file, backing_fmt, flags, |
6744cbab | 1432 | cluster_size, prealloc, options, version); |
de5f3f40 KW |
1433 | } |
1434 | ||
7c80ab3f | 1435 | static int qcow2_make_empty(BlockDriverState *bs) |
20d97356 BS |
1436 | { |
1437 | #if 0 | |
1438 | /* XXX: not correct */ | |
1439 | BDRVQcowState *s = bs->opaque; | |
1440 | uint32_t l1_length = s->l1_size * sizeof(uint64_t); | |
1441 | int ret; | |
1442 | ||
1443 | memset(s->l1_table, 0, l1_length); | |
66f82cee | 1444 | if (bdrv_pwrite(bs->file, s->l1_table_offset, s->l1_table, l1_length) < 0) |
20d97356 | 1445 | return -1; |
66f82cee | 1446 | ret = bdrv_truncate(bs->file, s->l1_table_offset + l1_length); |
20d97356 BS |
1447 | if (ret < 0) |
1448 | return ret; | |
1449 | ||
1450 | l2_cache_reset(bs); | |
1451 | #endif | |
1452 | return 0; | |
1453 | } | |
1454 | ||
621f0589 KW |
1455 | static coroutine_fn int qcow2_co_write_zeroes(BlockDriverState *bs, |
1456 | int64_t sector_num, int nb_sectors) | |
1457 | { | |
1458 | int ret; | |
1459 | BDRVQcowState *s = bs->opaque; | |
1460 | ||
1461 | /* Emulate misaligned zero writes */ | |
1462 | if (sector_num % s->cluster_sectors || nb_sectors % s->cluster_sectors) { | |
1463 | return -ENOTSUP; | |
1464 | } | |
1465 | ||
1466 | /* Whatever is left can use real zero clusters */ | |
1467 | qemu_co_mutex_lock(&s->lock); | |
1468 | ret = qcow2_zero_clusters(bs, sector_num << BDRV_SECTOR_BITS, | |
1469 | nb_sectors); | |
1470 | qemu_co_mutex_unlock(&s->lock); | |
1471 | ||
1472 | return ret; | |
1473 | } | |
1474 | ||
6db39ae2 PB |
1475 | static coroutine_fn int qcow2_co_discard(BlockDriverState *bs, |
1476 | int64_t sector_num, int nb_sectors) | |
5ea929e3 | 1477 | { |
6db39ae2 PB |
1478 | int ret; |
1479 | BDRVQcowState *s = bs->opaque; | |
1480 | ||
1481 | qemu_co_mutex_lock(&s->lock); | |
1482 | ret = qcow2_discard_clusters(bs, sector_num << BDRV_SECTOR_BITS, | |
5ea929e3 | 1483 | nb_sectors); |
6db39ae2 PB |
1484 | qemu_co_mutex_unlock(&s->lock); |
1485 | return ret; | |
5ea929e3 KW |
1486 | } |
1487 | ||
419b19d9 SH |
1488 | static int qcow2_truncate(BlockDriverState *bs, int64_t offset) |
1489 | { | |
1490 | BDRVQcowState *s = bs->opaque; | |
2cf7cfa1 KW |
1491 | int64_t new_l1_size; |
1492 | int ret; | |
419b19d9 SH |
1493 | |
1494 | if (offset & 511) { | |
259b2173 | 1495 | error_report("The new size must be a multiple of 512"); |
419b19d9 SH |
1496 | return -EINVAL; |
1497 | } | |
1498 | ||
1499 | /* cannot proceed if image has snapshots */ | |
1500 | if (s->nb_snapshots) { | |
259b2173 | 1501 | error_report("Can't resize an image which has snapshots"); |
419b19d9 SH |
1502 | return -ENOTSUP; |
1503 | } | |
1504 | ||
1505 | /* shrinking is currently not supported */ | |
1506 | if (offset < bs->total_sectors * 512) { | |
259b2173 | 1507 | error_report("qcow2 doesn't support shrinking images yet"); |
419b19d9 SH |
1508 | return -ENOTSUP; |
1509 | } | |
1510 | ||
1511 | new_l1_size = size_to_l1(s, offset); | |
72893756 | 1512 | ret = qcow2_grow_l1_table(bs, new_l1_size, true); |
419b19d9 SH |
1513 | if (ret < 0) { |
1514 | return ret; | |
1515 | } | |
1516 | ||
1517 | /* write updated header.size */ | |
1518 | offset = cpu_to_be64(offset); | |
8b3b7206 KW |
1519 | ret = bdrv_pwrite_sync(bs->file, offsetof(QCowHeader, size), |
1520 | &offset, sizeof(uint64_t)); | |
419b19d9 SH |
1521 | if (ret < 0) { |
1522 | return ret; | |
1523 | } | |
1524 | ||
1525 | s->l1_vm_state_index = new_l1_size; | |
1526 | return 0; | |
1527 | } | |
1528 | ||
20d97356 BS |
1529 | /* XXX: put compressed sectors first, then all the cluster aligned |
1530 | tables to avoid losing bytes in alignment */ | |
7c80ab3f JS |
1531 | static int qcow2_write_compressed(BlockDriverState *bs, int64_t sector_num, |
1532 | const uint8_t *buf, int nb_sectors) | |
20d97356 BS |
1533 | { |
1534 | BDRVQcowState *s = bs->opaque; | |
1535 | z_stream strm; | |
1536 | int ret, out_len; | |
1537 | uint8_t *out_buf; | |
1538 | uint64_t cluster_offset; | |
1539 | ||
1540 | if (nb_sectors == 0) { | |
1541 | /* align end of file to a sector boundary to ease reading with | |
1542 | sector based I/Os */ | |
66f82cee | 1543 | cluster_offset = bdrv_getlength(bs->file); |
20d97356 | 1544 | cluster_offset = (cluster_offset + 511) & ~511; |
66f82cee | 1545 | bdrv_truncate(bs->file, cluster_offset); |
20d97356 BS |
1546 | return 0; |
1547 | } | |
1548 | ||
f4d38bef SH |
1549 | if (nb_sectors != s->cluster_sectors) { |
1550 | ret = -EINVAL; | |
1551 | ||
1552 | /* Zero-pad last write if image size is not cluster aligned */ | |
1553 | if (sector_num + nb_sectors == bs->total_sectors && | |
1554 | nb_sectors < s->cluster_sectors) { | |
1555 | uint8_t *pad_buf = qemu_blockalign(bs, s->cluster_size); | |
1556 | memset(pad_buf, 0, s->cluster_size); | |
1557 | memcpy(pad_buf, buf, nb_sectors * BDRV_SECTOR_SIZE); | |
1558 | ret = qcow2_write_compressed(bs, sector_num, | |
1559 | pad_buf, s->cluster_sectors); | |
1560 | qemu_vfree(pad_buf); | |
1561 | } | |
1562 | return ret; | |
1563 | } | |
20d97356 | 1564 | |
7267c094 | 1565 | out_buf = g_malloc(s->cluster_size + (s->cluster_size / 1000) + 128); |
20d97356 BS |
1566 | |
1567 | /* best compression, small window, no zlib header */ | |
1568 | memset(&strm, 0, sizeof(strm)); | |
1569 | ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION, | |
1570 | Z_DEFLATED, -12, | |
1571 | 9, Z_DEFAULT_STRATEGY); | |
1572 | if (ret != 0) { | |
8f1efd00 KW |
1573 | ret = -EINVAL; |
1574 | goto fail; | |
20d97356 BS |
1575 | } |
1576 | ||
1577 | strm.avail_in = s->cluster_size; | |
1578 | strm.next_in = (uint8_t *)buf; | |
1579 | strm.avail_out = s->cluster_size; | |
1580 | strm.next_out = out_buf; | |
1581 | ||
1582 | ret = deflate(&strm, Z_FINISH); | |
1583 | if (ret != Z_STREAM_END && ret != Z_OK) { | |
20d97356 | 1584 | deflateEnd(&strm); |
8f1efd00 KW |
1585 | ret = -EINVAL; |
1586 | goto fail; | |
20d97356 BS |
1587 | } |
1588 | out_len = strm.next_out - out_buf; | |
1589 | ||
1590 | deflateEnd(&strm); | |
1591 | ||
1592 | if (ret != Z_STREAM_END || out_len >= s->cluster_size) { | |
1593 | /* could not compress: write normal cluster */ | |
8f1efd00 KW |
1594 | ret = bdrv_write(bs, sector_num, buf, s->cluster_sectors); |
1595 | if (ret < 0) { | |
1596 | goto fail; | |
1597 | } | |
20d97356 BS |
1598 | } else { |
1599 | cluster_offset = qcow2_alloc_compressed_cluster_offset(bs, | |
1600 | sector_num << 9, out_len); | |
8f1efd00 KW |
1601 | if (!cluster_offset) { |
1602 | ret = -EIO; | |
1603 | goto fail; | |
1604 | } | |
20d97356 | 1605 | cluster_offset &= s->cluster_offset_mask; |
66f82cee | 1606 | BLKDBG_EVENT(bs->file, BLKDBG_WRITE_COMPRESSED); |
8f1efd00 KW |
1607 | ret = bdrv_pwrite(bs->file, cluster_offset, out_buf, out_len); |
1608 | if (ret < 0) { | |
1609 | goto fail; | |
20d97356 BS |
1610 | } |
1611 | } | |
1612 | ||
8f1efd00 KW |
1613 | ret = 0; |
1614 | fail: | |
7267c094 | 1615 | g_free(out_buf); |
8f1efd00 | 1616 | return ret; |
20d97356 BS |
1617 | } |
1618 | ||
a968168c | 1619 | static coroutine_fn int qcow2_co_flush_to_os(BlockDriverState *bs) |
20d97356 | 1620 | { |
29c1a730 KW |
1621 | BDRVQcowState *s = bs->opaque; |
1622 | int ret; | |
1623 | ||
8b94ff85 | 1624 | qemu_co_mutex_lock(&s->lock); |
29c1a730 KW |
1625 | ret = qcow2_cache_flush(bs, s->l2_table_cache); |
1626 | if (ret < 0) { | |
c95de7e2 | 1627 | qemu_co_mutex_unlock(&s->lock); |
8b94ff85 | 1628 | return ret; |
29c1a730 KW |
1629 | } |
1630 | ||
bfe8043e SH |
1631 | if (qcow2_need_accurate_refcounts(s)) { |
1632 | ret = qcow2_cache_flush(bs, s->refcount_block_cache); | |
1633 | if (ret < 0) { | |
1634 | qemu_co_mutex_unlock(&s->lock); | |
1635 | return ret; | |
1636 | } | |
29c1a730 | 1637 | } |
8b94ff85 | 1638 | qemu_co_mutex_unlock(&s->lock); |
29c1a730 | 1639 | |
eb489bb1 KW |
1640 | return 0; |
1641 | } | |
1642 | ||
7c80ab3f | 1643 | static int64_t qcow2_vm_state_offset(BDRVQcowState *s) |
20d97356 BS |
1644 | { |
1645 | return (int64_t)s->l1_vm_state_index << (s->cluster_bits + s->l2_bits); | |
1646 | } | |
1647 | ||
7c80ab3f | 1648 | static int qcow2_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
20d97356 BS |
1649 | { |
1650 | BDRVQcowState *s = bs->opaque; | |
1651 | bdi->cluster_size = s->cluster_size; | |
7c80ab3f | 1652 | bdi->vm_state_offset = qcow2_vm_state_offset(s); |
20d97356 BS |
1653 | return 0; |
1654 | } | |
1655 | ||
20d97356 BS |
1656 | #if 0 |
1657 | static void dump_refcounts(BlockDriverState *bs) | |
1658 | { | |
1659 | BDRVQcowState *s = bs->opaque; | |
1660 | int64_t nb_clusters, k, k1, size; | |
1661 | int refcount; | |
1662 | ||
66f82cee | 1663 | size = bdrv_getlength(bs->file); |
20d97356 BS |
1664 | nb_clusters = size_to_clusters(s, size); |
1665 | for(k = 0; k < nb_clusters;) { | |
1666 | k1 = k; | |
1667 | refcount = get_refcount(bs, k); | |
1668 | k++; | |
1669 | while (k < nb_clusters && get_refcount(bs, k) == refcount) | |
1670 | k++; | |
0bfcd599 BS |
1671 | printf("%" PRId64 ": refcount=%d nb=%" PRId64 "\n", k, refcount, |
1672 | k - k1); | |
20d97356 BS |
1673 | } |
1674 | } | |
1675 | #endif | |
1676 | ||
cf8074b3 KW |
1677 | static int qcow2_save_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, |
1678 | int64_t pos) | |
20d97356 BS |
1679 | { |
1680 | BDRVQcowState *s = bs->opaque; | |
1681 | int growable = bs->growable; | |
1682 | int ret; | |
1683 | ||
66f82cee | 1684 | BLKDBG_EVENT(bs->file, BLKDBG_VMSTATE_SAVE); |
20d97356 | 1685 | bs->growable = 1; |
8d3b1a2d | 1686 | ret = bdrv_pwritev(bs, qcow2_vm_state_offset(s) + pos, qiov); |
20d97356 BS |
1687 | bs->growable = growable; |
1688 | ||
1689 | return ret; | |
1690 | } | |
1691 | ||
7c80ab3f JS |
1692 | static int qcow2_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
1693 | int64_t pos, int size) | |
20d97356 BS |
1694 | { |
1695 | BDRVQcowState *s = bs->opaque; | |
1696 | int growable = bs->growable; | |
1697 | int ret; | |
1698 | ||
66f82cee | 1699 | BLKDBG_EVENT(bs->file, BLKDBG_VMSTATE_LOAD); |
20d97356 | 1700 | bs->growable = 1; |
7c80ab3f | 1701 | ret = bdrv_pread(bs, qcow2_vm_state_offset(s) + pos, buf, size); |
20d97356 BS |
1702 | bs->growable = growable; |
1703 | ||
1704 | return ret; | |
1705 | } | |
1706 | ||
7c80ab3f | 1707 | static QEMUOptionParameter qcow2_create_options[] = { |
20d97356 BS |
1708 | { |
1709 | .name = BLOCK_OPT_SIZE, | |
1710 | .type = OPT_SIZE, | |
1711 | .help = "Virtual disk size" | |
1712 | }, | |
6744cbab KW |
1713 | { |
1714 | .name = BLOCK_OPT_COMPAT_LEVEL, | |
1715 | .type = OPT_STRING, | |
1716 | .help = "Compatibility level (0.10 or 1.1)" | |
1717 | }, | |
20d97356 BS |
1718 | { |
1719 | .name = BLOCK_OPT_BACKING_FILE, | |
1720 | .type = OPT_STRING, | |
1721 | .help = "File name of a base image" | |
1722 | }, | |
1723 | { | |
1724 | .name = BLOCK_OPT_BACKING_FMT, | |
1725 | .type = OPT_STRING, | |
1726 | .help = "Image format of the base image" | |
1727 | }, | |
1728 | { | |
1729 | .name = BLOCK_OPT_ENCRYPT, | |
1730 | .type = OPT_FLAG, | |
1731 | .help = "Encrypt the image" | |
1732 | }, | |
1733 | { | |
1734 | .name = BLOCK_OPT_CLUSTER_SIZE, | |
1735 | .type = OPT_SIZE, | |
99cce9fa KW |
1736 | .help = "qcow2 cluster size", |
1737 | .value = { .n = DEFAULT_CLUSTER_SIZE }, | |
20d97356 BS |
1738 | }, |
1739 | { | |
1740 | .name = BLOCK_OPT_PREALLOC, | |
1741 | .type = OPT_STRING, | |
1742 | .help = "Preallocation mode (allowed values: off, metadata)" | |
1743 | }, | |
bfe8043e SH |
1744 | { |
1745 | .name = BLOCK_OPT_LAZY_REFCOUNTS, | |
1746 | .type = OPT_FLAG, | |
1747 | .help = "Postpone refcount updates", | |
1748 | }, | |
20d97356 BS |
1749 | { NULL } |
1750 | }; | |
1751 | ||
1752 | static BlockDriver bdrv_qcow2 = { | |
7c80ab3f JS |
1753 | .format_name = "qcow2", |
1754 | .instance_size = sizeof(BDRVQcowState), | |
1755 | .bdrv_probe = qcow2_probe, | |
1756 | .bdrv_open = qcow2_open, | |
1757 | .bdrv_close = qcow2_close, | |
21d82ac9 | 1758 | .bdrv_reopen_prepare = qcow2_reopen_prepare, |
7c80ab3f | 1759 | .bdrv_create = qcow2_create, |
f8a2e5e3 | 1760 | .bdrv_co_is_allocated = qcow2_co_is_allocated, |
7c80ab3f JS |
1761 | .bdrv_set_key = qcow2_set_key, |
1762 | .bdrv_make_empty = qcow2_make_empty, | |
1763 | ||
c68b89ac KW |
1764 | .bdrv_co_readv = qcow2_co_readv, |
1765 | .bdrv_co_writev = qcow2_co_writev, | |
eb489bb1 | 1766 | .bdrv_co_flush_to_os = qcow2_co_flush_to_os, |
419b19d9 | 1767 | |
621f0589 | 1768 | .bdrv_co_write_zeroes = qcow2_co_write_zeroes, |
6db39ae2 | 1769 | .bdrv_co_discard = qcow2_co_discard, |
419b19d9 | 1770 | .bdrv_truncate = qcow2_truncate, |
7c80ab3f | 1771 | .bdrv_write_compressed = qcow2_write_compressed, |
20d97356 BS |
1772 | |
1773 | .bdrv_snapshot_create = qcow2_snapshot_create, | |
1774 | .bdrv_snapshot_goto = qcow2_snapshot_goto, | |
1775 | .bdrv_snapshot_delete = qcow2_snapshot_delete, | |
1776 | .bdrv_snapshot_list = qcow2_snapshot_list, | |
51ef6727 | 1777 | .bdrv_snapshot_load_tmp = qcow2_snapshot_load_tmp, |
7c80ab3f | 1778 | .bdrv_get_info = qcow2_get_info, |
20d97356 | 1779 | |
7c80ab3f JS |
1780 | .bdrv_save_vmstate = qcow2_save_vmstate, |
1781 | .bdrv_load_vmstate = qcow2_load_vmstate, | |
20d97356 BS |
1782 | |
1783 | .bdrv_change_backing_file = qcow2_change_backing_file, | |
1784 | ||
06d9260f AL |
1785 | .bdrv_invalidate_cache = qcow2_invalidate_cache, |
1786 | ||
7c80ab3f JS |
1787 | .create_options = qcow2_create_options, |
1788 | .bdrv_check = qcow2_check, | |
20d97356 BS |
1789 | }; |
1790 | ||
5efa9d5a AL |
1791 | static void bdrv_qcow2_init(void) |
1792 | { | |
1793 | bdrv_register(&bdrv_qcow2); | |
1794 | } | |
1795 | ||
1796 | block_init(bdrv_qcow2_init); |