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1 | /* | |
2 | * Block driver for the VMDK format | |
3 | * | |
4 | * Copyright (c) 2004 Fabrice Bellard | |
5 | * Copyright (c) 2005 Filip Navara | |
6 | * | |
7 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
8 | * of this software and associated documentation files (the "Software"), to deal | |
9 | * in the Software without restriction, including without limitation the rights | |
10 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
11 | * copies of the Software, and to permit persons to whom the Software is | |
12 | * furnished to do so, subject to the following conditions: | |
13 | * | |
14 | * The above copyright notice and this permission notice shall be included in | |
15 | * all copies or substantial portions of the Software. | |
16 | * | |
17 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
18 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
19 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
20 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
21 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
22 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
23 | * THE SOFTWARE. | |
24 | */ | |
25 | ||
26 | #include "qemu-common.h" | |
27 | #include "block/block_int.h" | |
28 | #include "qemu/module.h" | |
29 | #include "migration/migration.h" | |
30 | #include <zlib.h> | |
31 | #include <glib.h> | |
32 | ||
33 | #define VMDK3_MAGIC (('C' << 24) | ('O' << 16) | ('W' << 8) | 'D') | |
34 | #define VMDK4_MAGIC (('K' << 24) | ('D' << 16) | ('M' << 8) | 'V') | |
35 | #define VMDK4_COMPRESSION_DEFLATE 1 | |
36 | #define VMDK4_FLAG_NL_DETECT (1 << 0) | |
37 | #define VMDK4_FLAG_RGD (1 << 1) | |
38 | /* Zeroed-grain enable bit */ | |
39 | #define VMDK4_FLAG_ZERO_GRAIN (1 << 2) | |
40 | #define VMDK4_FLAG_COMPRESS (1 << 16) | |
41 | #define VMDK4_FLAG_MARKER (1 << 17) | |
42 | #define VMDK4_GD_AT_END 0xffffffffffffffffULL | |
43 | ||
44 | #define VMDK_GTE_ZEROED 0x1 | |
45 | ||
46 | /* VMDK internal error codes */ | |
47 | #define VMDK_OK 0 | |
48 | #define VMDK_ERROR (-1) | |
49 | /* Cluster not allocated */ | |
50 | #define VMDK_UNALLOC (-2) | |
51 | #define VMDK_ZEROED (-3) | |
52 | ||
53 | #define BLOCK_OPT_ZEROED_GRAIN "zeroed_grain" | |
54 | ||
55 | typedef struct { | |
56 | uint32_t version; | |
57 | uint32_t flags; | |
58 | uint32_t disk_sectors; | |
59 | uint32_t granularity; | |
60 | uint32_t l1dir_offset; | |
61 | uint32_t l1dir_size; | |
62 | uint32_t file_sectors; | |
63 | uint32_t cylinders; | |
64 | uint32_t heads; | |
65 | uint32_t sectors_per_track; | |
66 | } QEMU_PACKED VMDK3Header; | |
67 | ||
68 | typedef struct { | |
69 | uint32_t version; | |
70 | uint32_t flags; | |
71 | uint64_t capacity; | |
72 | uint64_t granularity; | |
73 | uint64_t desc_offset; | |
74 | uint64_t desc_size; | |
75 | /* Number of GrainTableEntries per GrainTable */ | |
76 | uint32_t num_gtes_per_gt; | |
77 | uint64_t rgd_offset; | |
78 | uint64_t gd_offset; | |
79 | uint64_t grain_offset; | |
80 | char filler[1]; | |
81 | char check_bytes[4]; | |
82 | uint16_t compressAlgorithm; | |
83 | } QEMU_PACKED VMDK4Header; | |
84 | ||
85 | #define L2_CACHE_SIZE 16 | |
86 | ||
87 | typedef struct VmdkExtent { | |
88 | BlockDriverState *file; | |
89 | bool flat; | |
90 | bool compressed; | |
91 | bool has_marker; | |
92 | bool has_zero_grain; | |
93 | int version; | |
94 | int64_t sectors; | |
95 | int64_t end_sector; | |
96 | int64_t flat_start_offset; | |
97 | int64_t l1_table_offset; | |
98 | int64_t l1_backup_table_offset; | |
99 | uint32_t *l1_table; | |
100 | uint32_t *l1_backup_table; | |
101 | unsigned int l1_size; | |
102 | uint32_t l1_entry_sectors; | |
103 | ||
104 | unsigned int l2_size; | |
105 | uint32_t *l2_cache; | |
106 | uint32_t l2_cache_offsets[L2_CACHE_SIZE]; | |
107 | uint32_t l2_cache_counts[L2_CACHE_SIZE]; | |
108 | ||
109 | int64_t cluster_sectors; | |
110 | int64_t next_cluster_sector; | |
111 | char *type; | |
112 | } VmdkExtent; | |
113 | ||
114 | typedef struct BDRVVmdkState { | |
115 | CoMutex lock; | |
116 | uint64_t desc_offset; | |
117 | bool cid_updated; | |
118 | bool cid_checked; | |
119 | uint32_t cid; | |
120 | uint32_t parent_cid; | |
121 | int num_extents; | |
122 | /* Extent array with num_extents entries, ascend ordered by address */ | |
123 | VmdkExtent *extents; | |
124 | Error *migration_blocker; | |
125 | char *create_type; | |
126 | } BDRVVmdkState; | |
127 | ||
128 | typedef struct VmdkMetaData { | |
129 | unsigned int l1_index; | |
130 | unsigned int l2_index; | |
131 | unsigned int l2_offset; | |
132 | int valid; | |
133 | uint32_t *l2_cache_entry; | |
134 | } VmdkMetaData; | |
135 | ||
136 | typedef struct VmdkGrainMarker { | |
137 | uint64_t lba; | |
138 | uint32_t size; | |
139 | uint8_t data[0]; | |
140 | } QEMU_PACKED VmdkGrainMarker; | |
141 | ||
142 | enum { | |
143 | MARKER_END_OF_STREAM = 0, | |
144 | MARKER_GRAIN_TABLE = 1, | |
145 | MARKER_GRAIN_DIRECTORY = 2, | |
146 | MARKER_FOOTER = 3, | |
147 | }; | |
148 | ||
149 | static int vmdk_probe(const uint8_t *buf, int buf_size, const char *filename) | |
150 | { | |
151 | uint32_t magic; | |
152 | ||
153 | if (buf_size < 4) { | |
154 | return 0; | |
155 | } | |
156 | magic = be32_to_cpu(*(uint32_t *)buf); | |
157 | if (magic == VMDK3_MAGIC || | |
158 | magic == VMDK4_MAGIC) { | |
159 | return 100; | |
160 | } else { | |
161 | const char *p = (const char *)buf; | |
162 | const char *end = p + buf_size; | |
163 | while (p < end) { | |
164 | if (*p == '#') { | |
165 | /* skip comment line */ | |
166 | while (p < end && *p != '\n') { | |
167 | p++; | |
168 | } | |
169 | p++; | |
170 | continue; | |
171 | } | |
172 | if (*p == ' ') { | |
173 | while (p < end && *p == ' ') { | |
174 | p++; | |
175 | } | |
176 | /* skip '\r' if windows line endings used. */ | |
177 | if (p < end && *p == '\r') { | |
178 | p++; | |
179 | } | |
180 | /* only accept blank lines before 'version=' line */ | |
181 | if (p == end || *p != '\n') { | |
182 | return 0; | |
183 | } | |
184 | p++; | |
185 | continue; | |
186 | } | |
187 | if (end - p >= strlen("version=X\n")) { | |
188 | if (strncmp("version=1\n", p, strlen("version=1\n")) == 0 || | |
189 | strncmp("version=2\n", p, strlen("version=2\n")) == 0) { | |
190 | return 100; | |
191 | } | |
192 | } | |
193 | if (end - p >= strlen("version=X\r\n")) { | |
194 | if (strncmp("version=1\r\n", p, strlen("version=1\r\n")) == 0 || | |
195 | strncmp("version=2\r\n", p, strlen("version=2\r\n")) == 0) { | |
196 | return 100; | |
197 | } | |
198 | } | |
199 | return 0; | |
200 | } | |
201 | return 0; | |
202 | } | |
203 | } | |
204 | ||
205 | #define SECTOR_SIZE 512 | |
206 | #define DESC_SIZE (20 * SECTOR_SIZE) /* 20 sectors of 512 bytes each */ | |
207 | #define BUF_SIZE 4096 | |
208 | #define HEADER_SIZE 512 /* first sector of 512 bytes */ | |
209 | ||
210 | static void vmdk_free_extents(BlockDriverState *bs) | |
211 | { | |
212 | int i; | |
213 | BDRVVmdkState *s = bs->opaque; | |
214 | VmdkExtent *e; | |
215 | ||
216 | for (i = 0; i < s->num_extents; i++) { | |
217 | e = &s->extents[i]; | |
218 | g_free(e->l1_table); | |
219 | g_free(e->l2_cache); | |
220 | g_free(e->l1_backup_table); | |
221 | g_free(e->type); | |
222 | if (e->file != bs->file) { | |
223 | bdrv_unref(e->file); | |
224 | } | |
225 | } | |
226 | g_free(s->extents); | |
227 | } | |
228 | ||
229 | static void vmdk_free_last_extent(BlockDriverState *bs) | |
230 | { | |
231 | BDRVVmdkState *s = bs->opaque; | |
232 | ||
233 | if (s->num_extents == 0) { | |
234 | return; | |
235 | } | |
236 | s->num_extents--; | |
237 | s->extents = g_renew(VmdkExtent, s->extents, s->num_extents); | |
238 | } | |
239 | ||
240 | static uint32_t vmdk_read_cid(BlockDriverState *bs, int parent) | |
241 | { | |
242 | char desc[DESC_SIZE]; | |
243 | uint32_t cid = 0xffffffff; | |
244 | const char *p_name, *cid_str; | |
245 | size_t cid_str_size; | |
246 | BDRVVmdkState *s = bs->opaque; | |
247 | int ret; | |
248 | ||
249 | ret = bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE); | |
250 | if (ret < 0) { | |
251 | return 0; | |
252 | } | |
253 | ||
254 | if (parent) { | |
255 | cid_str = "parentCID"; | |
256 | cid_str_size = sizeof("parentCID"); | |
257 | } else { | |
258 | cid_str = "CID"; | |
259 | cid_str_size = sizeof("CID"); | |
260 | } | |
261 | ||
262 | desc[DESC_SIZE - 1] = '\0'; | |
263 | p_name = strstr(desc, cid_str); | |
264 | if (p_name != NULL) { | |
265 | p_name += cid_str_size; | |
266 | sscanf(p_name, "%" SCNx32, &cid); | |
267 | } | |
268 | ||
269 | return cid; | |
270 | } | |
271 | ||
272 | static int vmdk_write_cid(BlockDriverState *bs, uint32_t cid) | |
273 | { | |
274 | char desc[DESC_SIZE], tmp_desc[DESC_SIZE]; | |
275 | char *p_name, *tmp_str; | |
276 | BDRVVmdkState *s = bs->opaque; | |
277 | int ret; | |
278 | ||
279 | ret = bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE); | |
280 | if (ret < 0) { | |
281 | return ret; | |
282 | } | |
283 | ||
284 | desc[DESC_SIZE - 1] = '\0'; | |
285 | tmp_str = strstr(desc, "parentCID"); | |
286 | if (tmp_str == NULL) { | |
287 | return -EINVAL; | |
288 | } | |
289 | ||
290 | pstrcpy(tmp_desc, sizeof(tmp_desc), tmp_str); | |
291 | p_name = strstr(desc, "CID"); | |
292 | if (p_name != NULL) { | |
293 | p_name += sizeof("CID"); | |
294 | snprintf(p_name, sizeof(desc) - (p_name - desc), "%" PRIx32 "\n", cid); | |
295 | pstrcat(desc, sizeof(desc), tmp_desc); | |
296 | } | |
297 | ||
298 | ret = bdrv_pwrite_sync(bs->file, s->desc_offset, desc, DESC_SIZE); | |
299 | if (ret < 0) { | |
300 | return ret; | |
301 | } | |
302 | ||
303 | return 0; | |
304 | } | |
305 | ||
306 | static int vmdk_is_cid_valid(BlockDriverState *bs) | |
307 | { | |
308 | BDRVVmdkState *s = bs->opaque; | |
309 | BlockDriverState *p_bs = bs->backing_hd; | |
310 | uint32_t cur_pcid; | |
311 | ||
312 | if (!s->cid_checked && p_bs) { | |
313 | cur_pcid = vmdk_read_cid(p_bs, 0); | |
314 | if (s->parent_cid != cur_pcid) { | |
315 | /* CID not valid */ | |
316 | return 0; | |
317 | } | |
318 | } | |
319 | s->cid_checked = true; | |
320 | /* CID valid */ | |
321 | return 1; | |
322 | } | |
323 | ||
324 | /* Queue extents, if any, for reopen() */ | |
325 | static int vmdk_reopen_prepare(BDRVReopenState *state, | |
326 | BlockReopenQueue *queue, Error **errp) | |
327 | { | |
328 | BDRVVmdkState *s; | |
329 | int ret = -1; | |
330 | int i; | |
331 | VmdkExtent *e; | |
332 | ||
333 | assert(state != NULL); | |
334 | assert(state->bs != NULL); | |
335 | ||
336 | if (queue == NULL) { | |
337 | error_setg(errp, "No reopen queue for VMDK extents"); | |
338 | goto exit; | |
339 | } | |
340 | ||
341 | s = state->bs->opaque; | |
342 | ||
343 | assert(s != NULL); | |
344 | ||
345 | for (i = 0; i < s->num_extents; i++) { | |
346 | e = &s->extents[i]; | |
347 | if (e->file != state->bs->file) { | |
348 | bdrv_reopen_queue(queue, e->file, state->flags); | |
349 | } | |
350 | } | |
351 | ret = 0; | |
352 | ||
353 | exit: | |
354 | return ret; | |
355 | } | |
356 | ||
357 | static int vmdk_parent_open(BlockDriverState *bs) | |
358 | { | |
359 | char *p_name; | |
360 | char desc[DESC_SIZE + 1]; | |
361 | BDRVVmdkState *s = bs->opaque; | |
362 | int ret; | |
363 | ||
364 | desc[DESC_SIZE] = '\0'; | |
365 | ret = bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE); | |
366 | if (ret < 0) { | |
367 | return ret; | |
368 | } | |
369 | ||
370 | p_name = strstr(desc, "parentFileNameHint"); | |
371 | if (p_name != NULL) { | |
372 | char *end_name; | |
373 | ||
374 | p_name += sizeof("parentFileNameHint") + 1; | |
375 | end_name = strchr(p_name, '\"'); | |
376 | if (end_name == NULL) { | |
377 | return -EINVAL; | |
378 | } | |
379 | if ((end_name - p_name) > sizeof(bs->backing_file) - 1) { | |
380 | return -EINVAL; | |
381 | } | |
382 | ||
383 | pstrcpy(bs->backing_file, end_name - p_name + 1, p_name); | |
384 | } | |
385 | ||
386 | return 0; | |
387 | } | |
388 | ||
389 | /* Create and append extent to the extent array. Return the added VmdkExtent | |
390 | * address. return NULL if allocation failed. */ | |
391 | static int vmdk_add_extent(BlockDriverState *bs, | |
392 | BlockDriverState *file, bool flat, int64_t sectors, | |
393 | int64_t l1_offset, int64_t l1_backup_offset, | |
394 | uint32_t l1_size, | |
395 | int l2_size, uint64_t cluster_sectors, | |
396 | VmdkExtent **new_extent, | |
397 | Error **errp) | |
398 | { | |
399 | VmdkExtent *extent; | |
400 | BDRVVmdkState *s = bs->opaque; | |
401 | int64_t nb_sectors; | |
402 | ||
403 | if (cluster_sectors > 0x200000) { | |
404 | /* 0x200000 * 512Bytes = 1GB for one cluster is unrealistic */ | |
405 | error_setg(errp, "Invalid granularity, image may be corrupt"); | |
406 | return -EFBIG; | |
407 | } | |
408 | if (l1_size > 512 * 1024 * 1024) { | |
409 | /* Although with big capacity and small l1_entry_sectors, we can get a | |
410 | * big l1_size, we don't want unbounded value to allocate the table. | |
411 | * Limit it to 512M, which is 16PB for default cluster and L2 table | |
412 | * size */ | |
413 | error_setg(errp, "L1 size too big"); | |
414 | return -EFBIG; | |
415 | } | |
416 | ||
417 | nb_sectors = bdrv_nb_sectors(file); | |
418 | if (nb_sectors < 0) { | |
419 | return nb_sectors; | |
420 | } | |
421 | ||
422 | s->extents = g_renew(VmdkExtent, s->extents, s->num_extents + 1); | |
423 | extent = &s->extents[s->num_extents]; | |
424 | s->num_extents++; | |
425 | ||
426 | memset(extent, 0, sizeof(VmdkExtent)); | |
427 | extent->file = file; | |
428 | extent->flat = flat; | |
429 | extent->sectors = sectors; | |
430 | extent->l1_table_offset = l1_offset; | |
431 | extent->l1_backup_table_offset = l1_backup_offset; | |
432 | extent->l1_size = l1_size; | |
433 | extent->l1_entry_sectors = l2_size * cluster_sectors; | |
434 | extent->l2_size = l2_size; | |
435 | extent->cluster_sectors = flat ? sectors : cluster_sectors; | |
436 | extent->next_cluster_sector = ROUND_UP(nb_sectors, cluster_sectors); | |
437 | ||
438 | if (s->num_extents > 1) { | |
439 | extent->end_sector = (*(extent - 1)).end_sector + extent->sectors; | |
440 | } else { | |
441 | extent->end_sector = extent->sectors; | |
442 | } | |
443 | bs->total_sectors = extent->end_sector; | |
444 | if (new_extent) { | |
445 | *new_extent = extent; | |
446 | } | |
447 | return 0; | |
448 | } | |
449 | ||
450 | static int vmdk_init_tables(BlockDriverState *bs, VmdkExtent *extent, | |
451 | Error **errp) | |
452 | { | |
453 | int ret; | |
454 | int l1_size, i; | |
455 | ||
456 | /* read the L1 table */ | |
457 | l1_size = extent->l1_size * sizeof(uint32_t); | |
458 | extent->l1_table = g_try_malloc(l1_size); | |
459 | if (l1_size && extent->l1_table == NULL) { | |
460 | return -ENOMEM; | |
461 | } | |
462 | ||
463 | ret = bdrv_pread(extent->file, | |
464 | extent->l1_table_offset, | |
465 | extent->l1_table, | |
466 | l1_size); | |
467 | if (ret < 0) { | |
468 | error_setg_errno(errp, -ret, | |
469 | "Could not read l1 table from extent '%s'", | |
470 | extent->file->filename); | |
471 | goto fail_l1; | |
472 | } | |
473 | for (i = 0; i < extent->l1_size; i++) { | |
474 | le32_to_cpus(&extent->l1_table[i]); | |
475 | } | |
476 | ||
477 | if (extent->l1_backup_table_offset) { | |
478 | extent->l1_backup_table = g_try_malloc(l1_size); | |
479 | if (l1_size && extent->l1_backup_table == NULL) { | |
480 | ret = -ENOMEM; | |
481 | goto fail_l1; | |
482 | } | |
483 | ret = bdrv_pread(extent->file, | |
484 | extent->l1_backup_table_offset, | |
485 | extent->l1_backup_table, | |
486 | l1_size); | |
487 | if (ret < 0) { | |
488 | error_setg_errno(errp, -ret, | |
489 | "Could not read l1 backup table from extent '%s'", | |
490 | extent->file->filename); | |
491 | goto fail_l1b; | |
492 | } | |
493 | for (i = 0; i < extent->l1_size; i++) { | |
494 | le32_to_cpus(&extent->l1_backup_table[i]); | |
495 | } | |
496 | } | |
497 | ||
498 | extent->l2_cache = | |
499 | g_new(uint32_t, extent->l2_size * L2_CACHE_SIZE); | |
500 | return 0; | |
501 | fail_l1b: | |
502 | g_free(extent->l1_backup_table); | |
503 | fail_l1: | |
504 | g_free(extent->l1_table); | |
505 | return ret; | |
506 | } | |
507 | ||
508 | static int vmdk_open_vmfs_sparse(BlockDriverState *bs, | |
509 | BlockDriverState *file, | |
510 | int flags, Error **errp) | |
511 | { | |
512 | int ret; | |
513 | uint32_t magic; | |
514 | VMDK3Header header; | |
515 | VmdkExtent *extent; | |
516 | ||
517 | ret = bdrv_pread(file, sizeof(magic), &header, sizeof(header)); | |
518 | if (ret < 0) { | |
519 | error_setg_errno(errp, -ret, | |
520 | "Could not read header from file '%s'", | |
521 | file->filename); | |
522 | return ret; | |
523 | } | |
524 | ret = vmdk_add_extent(bs, file, false, | |
525 | le32_to_cpu(header.disk_sectors), | |
526 | le32_to_cpu(header.l1dir_offset) << 9, | |
527 | 0, | |
528 | le32_to_cpu(header.l1dir_size), | |
529 | 4096, | |
530 | le32_to_cpu(header.granularity), | |
531 | &extent, | |
532 | errp); | |
533 | if (ret < 0) { | |
534 | return ret; | |
535 | } | |
536 | ret = vmdk_init_tables(bs, extent, errp); | |
537 | if (ret) { | |
538 | /* free extent allocated by vmdk_add_extent */ | |
539 | vmdk_free_last_extent(bs); | |
540 | } | |
541 | return ret; | |
542 | } | |
543 | ||
544 | static int vmdk_open_desc_file(BlockDriverState *bs, int flags, char *buf, | |
545 | Error **errp); | |
546 | ||
547 | static char *vmdk_read_desc(BlockDriverState *file, uint64_t desc_offset, | |
548 | Error **errp) | |
549 | { | |
550 | int64_t size; | |
551 | char *buf; | |
552 | int ret; | |
553 | ||
554 | size = bdrv_getlength(file); | |
555 | if (size < 0) { | |
556 | error_setg_errno(errp, -size, "Could not access file"); | |
557 | return NULL; | |
558 | } | |
559 | ||
560 | if (size < 4) { | |
561 | /* Both descriptor file and sparse image must be much larger than 4 | |
562 | * bytes, also callers of vmdk_read_desc want to compare the first 4 | |
563 | * bytes with VMDK4_MAGIC, let's error out if less is read. */ | |
564 | error_setg(errp, "File is too small, not a valid image"); | |
565 | return NULL; | |
566 | } | |
567 | ||
568 | size = MIN(size, (1 << 20) - 1); /* avoid unbounded allocation */ | |
569 | buf = g_malloc(size + 1); | |
570 | ||
571 | ret = bdrv_pread(file, desc_offset, buf, size); | |
572 | if (ret < 0) { | |
573 | error_setg_errno(errp, -ret, "Could not read from file"); | |
574 | g_free(buf); | |
575 | return NULL; | |
576 | } | |
577 | buf[ret] = 0; | |
578 | ||
579 | return buf; | |
580 | } | |
581 | ||
582 | static int vmdk_open_vmdk4(BlockDriverState *bs, | |
583 | BlockDriverState *file, | |
584 | int flags, Error **errp) | |
585 | { | |
586 | int ret; | |
587 | uint32_t magic; | |
588 | uint32_t l1_size, l1_entry_sectors; | |
589 | VMDK4Header header; | |
590 | VmdkExtent *extent; | |
591 | BDRVVmdkState *s = bs->opaque; | |
592 | int64_t l1_backup_offset = 0; | |
593 | ||
594 | ret = bdrv_pread(file, sizeof(magic), &header, sizeof(header)); | |
595 | if (ret < 0) { | |
596 | error_setg_errno(errp, -ret, | |
597 | "Could not read header from file '%s'", | |
598 | file->filename); | |
599 | return -EINVAL; | |
600 | } | |
601 | if (header.capacity == 0) { | |
602 | uint64_t desc_offset = le64_to_cpu(header.desc_offset); | |
603 | if (desc_offset) { | |
604 | char *buf = vmdk_read_desc(file, desc_offset << 9, errp); | |
605 | if (!buf) { | |
606 | return -EINVAL; | |
607 | } | |
608 | ret = vmdk_open_desc_file(bs, flags, buf, errp); | |
609 | g_free(buf); | |
610 | return ret; | |
611 | } | |
612 | } | |
613 | ||
614 | if (!s->create_type) { | |
615 | s->create_type = g_strdup("monolithicSparse"); | |
616 | } | |
617 | ||
618 | if (le64_to_cpu(header.gd_offset) == VMDK4_GD_AT_END) { | |
619 | /* | |
620 | * The footer takes precedence over the header, so read it in. The | |
621 | * footer starts at offset -1024 from the end: One sector for the | |
622 | * footer, and another one for the end-of-stream marker. | |
623 | */ | |
624 | struct { | |
625 | struct { | |
626 | uint64_t val; | |
627 | uint32_t size; | |
628 | uint32_t type; | |
629 | uint8_t pad[512 - 16]; | |
630 | } QEMU_PACKED footer_marker; | |
631 | ||
632 | uint32_t magic; | |
633 | VMDK4Header header; | |
634 | uint8_t pad[512 - 4 - sizeof(VMDK4Header)]; | |
635 | ||
636 | struct { | |
637 | uint64_t val; | |
638 | uint32_t size; | |
639 | uint32_t type; | |
640 | uint8_t pad[512 - 16]; | |
641 | } QEMU_PACKED eos_marker; | |
642 | } QEMU_PACKED footer; | |
643 | ||
644 | ret = bdrv_pread(file, | |
645 | bs->file->total_sectors * 512 - 1536, | |
646 | &footer, sizeof(footer)); | |
647 | if (ret < 0) { | |
648 | error_setg_errno(errp, -ret, "Failed to read footer"); | |
649 | return ret; | |
650 | } | |
651 | ||
652 | /* Some sanity checks for the footer */ | |
653 | if (be32_to_cpu(footer.magic) != VMDK4_MAGIC || | |
654 | le32_to_cpu(footer.footer_marker.size) != 0 || | |
655 | le32_to_cpu(footer.footer_marker.type) != MARKER_FOOTER || | |
656 | le64_to_cpu(footer.eos_marker.val) != 0 || | |
657 | le32_to_cpu(footer.eos_marker.size) != 0 || | |
658 | le32_to_cpu(footer.eos_marker.type) != MARKER_END_OF_STREAM) | |
659 | { | |
660 | error_setg(errp, "Invalid footer"); | |
661 | return -EINVAL; | |
662 | } | |
663 | ||
664 | header = footer.header; | |
665 | } | |
666 | ||
667 | if (le32_to_cpu(header.version) > 3) { | |
668 | char buf[64]; | |
669 | snprintf(buf, sizeof(buf), "VMDK version %" PRId32, | |
670 | le32_to_cpu(header.version)); | |
671 | error_set(errp, QERR_UNKNOWN_BLOCK_FORMAT_FEATURE, | |
672 | bdrv_get_device_name(bs), "vmdk", buf); | |
673 | return -ENOTSUP; | |
674 | } else if (le32_to_cpu(header.version) == 3 && (flags & BDRV_O_RDWR)) { | |
675 | /* VMware KB 2064959 explains that version 3 added support for | |
676 | * persistent changed block tracking (CBT), and backup software can | |
677 | * read it as version=1 if it doesn't care about the changed area | |
678 | * information. So we are safe to enable read only. */ | |
679 | error_setg(errp, "VMDK version 3 must be read only"); | |
680 | return -EINVAL; | |
681 | } | |
682 | ||
683 | if (le32_to_cpu(header.num_gtes_per_gt) > 512) { | |
684 | error_setg(errp, "L2 table size too big"); | |
685 | return -EINVAL; | |
686 | } | |
687 | ||
688 | l1_entry_sectors = le32_to_cpu(header.num_gtes_per_gt) | |
689 | * le64_to_cpu(header.granularity); | |
690 | if (l1_entry_sectors == 0) { | |
691 | error_setg(errp, "L1 entry size is invalid"); | |
692 | return -EINVAL; | |
693 | } | |
694 | l1_size = (le64_to_cpu(header.capacity) + l1_entry_sectors - 1) | |
695 | / l1_entry_sectors; | |
696 | if (le32_to_cpu(header.flags) & VMDK4_FLAG_RGD) { | |
697 | l1_backup_offset = le64_to_cpu(header.rgd_offset) << 9; | |
698 | } | |
699 | if (bdrv_nb_sectors(file) < le64_to_cpu(header.grain_offset)) { | |
700 | error_setg(errp, "File truncated, expecting at least %" PRId64 " bytes", | |
701 | (int64_t)(le64_to_cpu(header.grain_offset) | |
702 | * BDRV_SECTOR_SIZE)); | |
703 | return -EINVAL; | |
704 | } | |
705 | ||
706 | ret = vmdk_add_extent(bs, file, false, | |
707 | le64_to_cpu(header.capacity), | |
708 | le64_to_cpu(header.gd_offset) << 9, | |
709 | l1_backup_offset, | |
710 | l1_size, | |
711 | le32_to_cpu(header.num_gtes_per_gt), | |
712 | le64_to_cpu(header.granularity), | |
713 | &extent, | |
714 | errp); | |
715 | if (ret < 0) { | |
716 | return ret; | |
717 | } | |
718 | extent->compressed = | |
719 | le16_to_cpu(header.compressAlgorithm) == VMDK4_COMPRESSION_DEFLATE; | |
720 | if (extent->compressed) { | |
721 | g_free(s->create_type); | |
722 | s->create_type = g_strdup("streamOptimized"); | |
723 | } | |
724 | extent->has_marker = le32_to_cpu(header.flags) & VMDK4_FLAG_MARKER; | |
725 | extent->version = le32_to_cpu(header.version); | |
726 | extent->has_zero_grain = le32_to_cpu(header.flags) & VMDK4_FLAG_ZERO_GRAIN; | |
727 | ret = vmdk_init_tables(bs, extent, errp); | |
728 | if (ret) { | |
729 | /* free extent allocated by vmdk_add_extent */ | |
730 | vmdk_free_last_extent(bs); | |
731 | } | |
732 | return ret; | |
733 | } | |
734 | ||
735 | /* find an option value out of descriptor file */ | |
736 | static int vmdk_parse_description(const char *desc, const char *opt_name, | |
737 | char *buf, int buf_size) | |
738 | { | |
739 | char *opt_pos, *opt_end; | |
740 | const char *end = desc + strlen(desc); | |
741 | ||
742 | opt_pos = strstr(desc, opt_name); | |
743 | if (!opt_pos) { | |
744 | return VMDK_ERROR; | |
745 | } | |
746 | /* Skip "=\"" following opt_name */ | |
747 | opt_pos += strlen(opt_name) + 2; | |
748 | if (opt_pos >= end) { | |
749 | return VMDK_ERROR; | |
750 | } | |
751 | opt_end = opt_pos; | |
752 | while (opt_end < end && *opt_end != '"') { | |
753 | opt_end++; | |
754 | } | |
755 | if (opt_end == end || buf_size < opt_end - opt_pos + 1) { | |
756 | return VMDK_ERROR; | |
757 | } | |
758 | pstrcpy(buf, opt_end - opt_pos + 1, opt_pos); | |
759 | return VMDK_OK; | |
760 | } | |
761 | ||
762 | /* Open an extent file and append to bs array */ | |
763 | static int vmdk_open_sparse(BlockDriverState *bs, | |
764 | BlockDriverState *file, int flags, | |
765 | char *buf, Error **errp) | |
766 | { | |
767 | uint32_t magic; | |
768 | ||
769 | magic = ldl_be_p(buf); | |
770 | switch (magic) { | |
771 | case VMDK3_MAGIC: | |
772 | return vmdk_open_vmfs_sparse(bs, file, flags, errp); | |
773 | break; | |
774 | case VMDK4_MAGIC: | |
775 | return vmdk_open_vmdk4(bs, file, flags, errp); | |
776 | break; | |
777 | default: | |
778 | error_setg(errp, "Image not in VMDK format"); | |
779 | return -EINVAL; | |
780 | break; | |
781 | } | |
782 | } | |
783 | ||
784 | static int vmdk_parse_extents(const char *desc, BlockDriverState *bs, | |
785 | const char *desc_file_path, Error **errp) | |
786 | { | |
787 | int ret; | |
788 | char access[11]; | |
789 | char type[11]; | |
790 | char fname[512]; | |
791 | const char *p = desc; | |
792 | int64_t sectors = 0; | |
793 | int64_t flat_offset; | |
794 | char extent_path[PATH_MAX]; | |
795 | BlockDriverState *extent_file; | |
796 | BDRVVmdkState *s = bs->opaque; | |
797 | VmdkExtent *extent; | |
798 | ||
799 | while (*p) { | |
800 | /* parse extent line in one of below formats: | |
801 | * | |
802 | * RW [size in sectors] FLAT "file-name.vmdk" OFFSET | |
803 | * RW [size in sectors] SPARSE "file-name.vmdk" | |
804 | * RW [size in sectors] VMFS "file-name.vmdk" | |
805 | * RW [size in sectors] VMFSSPARSE "file-name.vmdk" | |
806 | */ | |
807 | flat_offset = -1; | |
808 | ret = sscanf(p, "%10s %" SCNd64 " %10s \"%511[^\n\r\"]\" %" SCNd64, | |
809 | access, §ors, type, fname, &flat_offset); | |
810 | if (ret < 4 || strcmp(access, "RW")) { | |
811 | goto next_line; | |
812 | } else if (!strcmp(type, "FLAT")) { | |
813 | if (ret != 5 || flat_offset < 0) { | |
814 | error_setg(errp, "Invalid extent lines: \n%s", p); | |
815 | return -EINVAL; | |
816 | } | |
817 | } else if (!strcmp(type, "VMFS")) { | |
818 | if (ret == 4) { | |
819 | flat_offset = 0; | |
820 | } else { | |
821 | error_setg(errp, "Invalid extent lines:\n%s", p); | |
822 | return -EINVAL; | |
823 | } | |
824 | } else if (ret != 4) { | |
825 | error_setg(errp, "Invalid extent lines:\n%s", p); | |
826 | return -EINVAL; | |
827 | } | |
828 | ||
829 | if (sectors <= 0 || | |
830 | (strcmp(type, "FLAT") && strcmp(type, "SPARSE") && | |
831 | strcmp(type, "VMFS") && strcmp(type, "VMFSSPARSE")) || | |
832 | (strcmp(access, "RW"))) { | |
833 | goto next_line; | |
834 | } | |
835 | ||
836 | if (!path_is_absolute(fname) && !path_has_protocol(fname) && | |
837 | !desc_file_path[0]) | |
838 | { | |
839 | error_setg(errp, "Cannot use relative extent paths with VMDK " | |
840 | "descriptor file '%s'", bs->file->filename); | |
841 | return -EINVAL; | |
842 | } | |
843 | ||
844 | path_combine(extent_path, sizeof(extent_path), | |
845 | desc_file_path, fname); | |
846 | extent_file = NULL; | |
847 | ret = bdrv_open(&extent_file, extent_path, NULL, NULL, | |
848 | bs->open_flags | BDRV_O_PROTOCOL, NULL, errp); | |
849 | if (ret) { | |
850 | return ret; | |
851 | } | |
852 | ||
853 | /* save to extents array */ | |
854 | if (!strcmp(type, "FLAT") || !strcmp(type, "VMFS")) { | |
855 | /* FLAT extent */ | |
856 | ||
857 | ret = vmdk_add_extent(bs, extent_file, true, sectors, | |
858 | 0, 0, 0, 0, 0, &extent, errp); | |
859 | if (ret < 0) { | |
860 | bdrv_unref(extent_file); | |
861 | return ret; | |
862 | } | |
863 | extent->flat_start_offset = flat_offset << 9; | |
864 | } else if (!strcmp(type, "SPARSE") || !strcmp(type, "VMFSSPARSE")) { | |
865 | /* SPARSE extent and VMFSSPARSE extent are both "COWD" sparse file*/ | |
866 | char *buf = vmdk_read_desc(extent_file, 0, errp); | |
867 | if (!buf) { | |
868 | ret = -EINVAL; | |
869 | } else { | |
870 | ret = vmdk_open_sparse(bs, extent_file, bs->open_flags, buf, errp); | |
871 | } | |
872 | g_free(buf); | |
873 | if (ret) { | |
874 | bdrv_unref(extent_file); | |
875 | return ret; | |
876 | } | |
877 | extent = &s->extents[s->num_extents - 1]; | |
878 | } else { | |
879 | error_setg(errp, "Unsupported extent type '%s'", type); | |
880 | bdrv_unref(extent_file); | |
881 | return -ENOTSUP; | |
882 | } | |
883 | extent->type = g_strdup(type); | |
884 | next_line: | |
885 | /* move to next line */ | |
886 | while (*p) { | |
887 | if (*p == '\n') { | |
888 | p++; | |
889 | break; | |
890 | } | |
891 | p++; | |
892 | } | |
893 | } | |
894 | return 0; | |
895 | } | |
896 | ||
897 | static int vmdk_open_desc_file(BlockDriverState *bs, int flags, char *buf, | |
898 | Error **errp) | |
899 | { | |
900 | int ret; | |
901 | char ct[128]; | |
902 | BDRVVmdkState *s = bs->opaque; | |
903 | ||
904 | if (vmdk_parse_description(buf, "createType", ct, sizeof(ct))) { | |
905 | error_setg(errp, "invalid VMDK image descriptor"); | |
906 | ret = -EINVAL; | |
907 | goto exit; | |
908 | } | |
909 | if (strcmp(ct, "monolithicFlat") && | |
910 | strcmp(ct, "vmfs") && | |
911 | strcmp(ct, "vmfsSparse") && | |
912 | strcmp(ct, "twoGbMaxExtentSparse") && | |
913 | strcmp(ct, "twoGbMaxExtentFlat")) { | |
914 | error_setg(errp, "Unsupported image type '%s'", ct); | |
915 | ret = -ENOTSUP; | |
916 | goto exit; | |
917 | } | |
918 | s->create_type = g_strdup(ct); | |
919 | s->desc_offset = 0; | |
920 | ret = vmdk_parse_extents(buf, bs, bs->file->exact_filename, errp); | |
921 | exit: | |
922 | return ret; | |
923 | } | |
924 | ||
925 | static int vmdk_open(BlockDriverState *bs, QDict *options, int flags, | |
926 | Error **errp) | |
927 | { | |
928 | char *buf; | |
929 | int ret; | |
930 | BDRVVmdkState *s = bs->opaque; | |
931 | uint32_t magic; | |
932 | ||
933 | buf = vmdk_read_desc(bs->file, 0, errp); | |
934 | if (!buf) { | |
935 | return -EINVAL; | |
936 | } | |
937 | ||
938 | magic = ldl_be_p(buf); | |
939 | switch (magic) { | |
940 | case VMDK3_MAGIC: | |
941 | case VMDK4_MAGIC: | |
942 | ret = vmdk_open_sparse(bs, bs->file, flags, buf, errp); | |
943 | s->desc_offset = 0x200; | |
944 | break; | |
945 | default: | |
946 | ret = vmdk_open_desc_file(bs, flags, buf, errp); | |
947 | break; | |
948 | } | |
949 | if (ret) { | |
950 | goto fail; | |
951 | } | |
952 | ||
953 | /* try to open parent images, if exist */ | |
954 | ret = vmdk_parent_open(bs); | |
955 | if (ret) { | |
956 | goto fail; | |
957 | } | |
958 | s->cid = vmdk_read_cid(bs, 0); | |
959 | s->parent_cid = vmdk_read_cid(bs, 1); | |
960 | qemu_co_mutex_init(&s->lock); | |
961 | ||
962 | /* Disable migration when VMDK images are used */ | |
963 | error_set(&s->migration_blocker, | |
964 | QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED, | |
965 | "vmdk", bdrv_get_device_name(bs), "live migration"); | |
966 | migrate_add_blocker(s->migration_blocker); | |
967 | g_free(buf); | |
968 | return 0; | |
969 | ||
970 | fail: | |
971 | g_free(buf); | |
972 | g_free(s->create_type); | |
973 | s->create_type = NULL; | |
974 | vmdk_free_extents(bs); | |
975 | return ret; | |
976 | } | |
977 | ||
978 | ||
979 | static void vmdk_refresh_limits(BlockDriverState *bs, Error **errp) | |
980 | { | |
981 | BDRVVmdkState *s = bs->opaque; | |
982 | int i; | |
983 | ||
984 | for (i = 0; i < s->num_extents; i++) { | |
985 | if (!s->extents[i].flat) { | |
986 | bs->bl.write_zeroes_alignment = | |
987 | MAX(bs->bl.write_zeroes_alignment, | |
988 | s->extents[i].cluster_sectors); | |
989 | } | |
990 | } | |
991 | } | |
992 | ||
993 | /** | |
994 | * get_whole_cluster | |
995 | * | |
996 | * Copy backing file's cluster that covers @sector_num, otherwise write zero, | |
997 | * to the cluster at @cluster_sector_num. | |
998 | * | |
999 | * If @skip_start_sector < @skip_end_sector, the relative range | |
1000 | * [@skip_start_sector, @skip_end_sector) is not copied or written, and leave | |
1001 | * it for call to write user data in the request. | |
1002 | */ | |
1003 | static int get_whole_cluster(BlockDriverState *bs, | |
1004 | VmdkExtent *extent, | |
1005 | uint64_t cluster_sector_num, | |
1006 | uint64_t sector_num, | |
1007 | uint64_t skip_start_sector, | |
1008 | uint64_t skip_end_sector) | |
1009 | { | |
1010 | int ret = VMDK_OK; | |
1011 | int64_t cluster_bytes; | |
1012 | uint8_t *whole_grain; | |
1013 | ||
1014 | /* For COW, align request sector_num to cluster start */ | |
1015 | sector_num = QEMU_ALIGN_DOWN(sector_num, extent->cluster_sectors); | |
1016 | cluster_bytes = extent->cluster_sectors << BDRV_SECTOR_BITS; | |
1017 | whole_grain = qemu_blockalign(bs, cluster_bytes); | |
1018 | ||
1019 | if (!bs->backing_hd) { | |
1020 | memset(whole_grain, 0, skip_start_sector << BDRV_SECTOR_BITS); | |
1021 | memset(whole_grain + (skip_end_sector << BDRV_SECTOR_BITS), 0, | |
1022 | cluster_bytes - (skip_end_sector << BDRV_SECTOR_BITS)); | |
1023 | } | |
1024 | ||
1025 | assert(skip_end_sector <= extent->cluster_sectors); | |
1026 | /* we will be here if it's first write on non-exist grain(cluster). | |
1027 | * try to read from parent image, if exist */ | |
1028 | if (bs->backing_hd && !vmdk_is_cid_valid(bs)) { | |
1029 | ret = VMDK_ERROR; | |
1030 | goto exit; | |
1031 | } | |
1032 | ||
1033 | /* Read backing data before skip range */ | |
1034 | if (skip_start_sector > 0) { | |
1035 | if (bs->backing_hd) { | |
1036 | ret = bdrv_read(bs->backing_hd, sector_num, | |
1037 | whole_grain, skip_start_sector); | |
1038 | if (ret < 0) { | |
1039 | ret = VMDK_ERROR; | |
1040 | goto exit; | |
1041 | } | |
1042 | } | |
1043 | ret = bdrv_write(extent->file, cluster_sector_num, whole_grain, | |
1044 | skip_start_sector); | |
1045 | if (ret < 0) { | |
1046 | ret = VMDK_ERROR; | |
1047 | goto exit; | |
1048 | } | |
1049 | } | |
1050 | /* Read backing data after skip range */ | |
1051 | if (skip_end_sector < extent->cluster_sectors) { | |
1052 | if (bs->backing_hd) { | |
1053 | ret = bdrv_read(bs->backing_hd, sector_num + skip_end_sector, | |
1054 | whole_grain + (skip_end_sector << BDRV_SECTOR_BITS), | |
1055 | extent->cluster_sectors - skip_end_sector); | |
1056 | if (ret < 0) { | |
1057 | ret = VMDK_ERROR; | |
1058 | goto exit; | |
1059 | } | |
1060 | } | |
1061 | ret = bdrv_write(extent->file, cluster_sector_num + skip_end_sector, | |
1062 | whole_grain + (skip_end_sector << BDRV_SECTOR_BITS), | |
1063 | extent->cluster_sectors - skip_end_sector); | |
1064 | if (ret < 0) { | |
1065 | ret = VMDK_ERROR; | |
1066 | goto exit; | |
1067 | } | |
1068 | } | |
1069 | ||
1070 | exit: | |
1071 | qemu_vfree(whole_grain); | |
1072 | return ret; | |
1073 | } | |
1074 | ||
1075 | static int vmdk_L2update(VmdkExtent *extent, VmdkMetaData *m_data, | |
1076 | uint32_t offset) | |
1077 | { | |
1078 | offset = cpu_to_le32(offset); | |
1079 | /* update L2 table */ | |
1080 | if (bdrv_pwrite_sync( | |
1081 | extent->file, | |
1082 | ((int64_t)m_data->l2_offset * 512) | |
1083 | + (m_data->l2_index * sizeof(offset)), | |
1084 | &offset, sizeof(offset)) < 0) { | |
1085 | return VMDK_ERROR; | |
1086 | } | |
1087 | /* update backup L2 table */ | |
1088 | if (extent->l1_backup_table_offset != 0) { | |
1089 | m_data->l2_offset = extent->l1_backup_table[m_data->l1_index]; | |
1090 | if (bdrv_pwrite_sync( | |
1091 | extent->file, | |
1092 | ((int64_t)m_data->l2_offset * 512) | |
1093 | + (m_data->l2_index * sizeof(offset)), | |
1094 | &offset, sizeof(offset)) < 0) { | |
1095 | return VMDK_ERROR; | |
1096 | } | |
1097 | } | |
1098 | if (m_data->l2_cache_entry) { | |
1099 | *m_data->l2_cache_entry = offset; | |
1100 | } | |
1101 | ||
1102 | return VMDK_OK; | |
1103 | } | |
1104 | ||
1105 | /** | |
1106 | * get_cluster_offset | |
1107 | * | |
1108 | * Look up cluster offset in extent file by sector number, and store in | |
1109 | * @cluster_offset. | |
1110 | * | |
1111 | * For flat extents, the start offset as parsed from the description file is | |
1112 | * returned. | |
1113 | * | |
1114 | * For sparse extents, look up in L1, L2 table. If allocate is true, return an | |
1115 | * offset for a new cluster and update L2 cache. If there is a backing file, | |
1116 | * COW is done before returning; otherwise, zeroes are written to the allocated | |
1117 | * cluster. Both COW and zero writing skips the sector range | |
1118 | * [@skip_start_sector, @skip_end_sector) passed in by caller, because caller | |
1119 | * has new data to write there. | |
1120 | * | |
1121 | * Returns: VMDK_OK if cluster exists and mapped in the image. | |
1122 | * VMDK_UNALLOC if cluster is not mapped and @allocate is false. | |
1123 | * VMDK_ERROR if failed. | |
1124 | */ | |
1125 | static int get_cluster_offset(BlockDriverState *bs, | |
1126 | VmdkExtent *extent, | |
1127 | VmdkMetaData *m_data, | |
1128 | uint64_t offset, | |
1129 | bool allocate, | |
1130 | uint64_t *cluster_offset, | |
1131 | uint64_t skip_start_sector, | |
1132 | uint64_t skip_end_sector) | |
1133 | { | |
1134 | unsigned int l1_index, l2_offset, l2_index; | |
1135 | int min_index, i, j; | |
1136 | uint32_t min_count, *l2_table; | |
1137 | bool zeroed = false; | |
1138 | int64_t ret; | |
1139 | int64_t cluster_sector; | |
1140 | ||
1141 | if (m_data) { | |
1142 | m_data->valid = 0; | |
1143 | } | |
1144 | if (extent->flat) { | |
1145 | *cluster_offset = extent->flat_start_offset; | |
1146 | return VMDK_OK; | |
1147 | } | |
1148 | ||
1149 | offset -= (extent->end_sector - extent->sectors) * SECTOR_SIZE; | |
1150 | l1_index = (offset >> 9) / extent->l1_entry_sectors; | |
1151 | if (l1_index >= extent->l1_size) { | |
1152 | return VMDK_ERROR; | |
1153 | } | |
1154 | l2_offset = extent->l1_table[l1_index]; | |
1155 | if (!l2_offset) { | |
1156 | return VMDK_UNALLOC; | |
1157 | } | |
1158 | for (i = 0; i < L2_CACHE_SIZE; i++) { | |
1159 | if (l2_offset == extent->l2_cache_offsets[i]) { | |
1160 | /* increment the hit count */ | |
1161 | if (++extent->l2_cache_counts[i] == 0xffffffff) { | |
1162 | for (j = 0; j < L2_CACHE_SIZE; j++) { | |
1163 | extent->l2_cache_counts[j] >>= 1; | |
1164 | } | |
1165 | } | |
1166 | l2_table = extent->l2_cache + (i * extent->l2_size); | |
1167 | goto found; | |
1168 | } | |
1169 | } | |
1170 | /* not found: load a new entry in the least used one */ | |
1171 | min_index = 0; | |
1172 | min_count = 0xffffffff; | |
1173 | for (i = 0; i < L2_CACHE_SIZE; i++) { | |
1174 | if (extent->l2_cache_counts[i] < min_count) { | |
1175 | min_count = extent->l2_cache_counts[i]; | |
1176 | min_index = i; | |
1177 | } | |
1178 | } | |
1179 | l2_table = extent->l2_cache + (min_index * extent->l2_size); | |
1180 | if (bdrv_pread( | |
1181 | extent->file, | |
1182 | (int64_t)l2_offset * 512, | |
1183 | l2_table, | |
1184 | extent->l2_size * sizeof(uint32_t) | |
1185 | ) != extent->l2_size * sizeof(uint32_t)) { | |
1186 | return VMDK_ERROR; | |
1187 | } | |
1188 | ||
1189 | extent->l2_cache_offsets[min_index] = l2_offset; | |
1190 | extent->l2_cache_counts[min_index] = 1; | |
1191 | found: | |
1192 | l2_index = ((offset >> 9) / extent->cluster_sectors) % extent->l2_size; | |
1193 | cluster_sector = le32_to_cpu(l2_table[l2_index]); | |
1194 | ||
1195 | if (m_data) { | |
1196 | m_data->valid = 1; | |
1197 | m_data->l1_index = l1_index; | |
1198 | m_data->l2_index = l2_index; | |
1199 | m_data->l2_offset = l2_offset; | |
1200 | m_data->l2_cache_entry = &l2_table[l2_index]; | |
1201 | } | |
1202 | if (extent->has_zero_grain && cluster_sector == VMDK_GTE_ZEROED) { | |
1203 | zeroed = true; | |
1204 | } | |
1205 | ||
1206 | if (!cluster_sector || zeroed) { | |
1207 | if (!allocate) { | |
1208 | return zeroed ? VMDK_ZEROED : VMDK_UNALLOC; | |
1209 | } | |
1210 | ||
1211 | cluster_sector = extent->next_cluster_sector; | |
1212 | extent->next_cluster_sector += extent->cluster_sectors; | |
1213 | ||
1214 | /* First of all we write grain itself, to avoid race condition | |
1215 | * that may to corrupt the image. | |
1216 | * This problem may occur because of insufficient space on host disk | |
1217 | * or inappropriate VM shutdown. | |
1218 | */ | |
1219 | ret = get_whole_cluster(bs, extent, | |
1220 | cluster_sector, | |
1221 | offset >> BDRV_SECTOR_BITS, | |
1222 | skip_start_sector, skip_end_sector); | |
1223 | if (ret) { | |
1224 | return ret; | |
1225 | } | |
1226 | } | |
1227 | *cluster_offset = cluster_sector << BDRV_SECTOR_BITS; | |
1228 | return VMDK_OK; | |
1229 | } | |
1230 | ||
1231 | static VmdkExtent *find_extent(BDRVVmdkState *s, | |
1232 | int64_t sector_num, VmdkExtent *start_hint) | |
1233 | { | |
1234 | VmdkExtent *extent = start_hint; | |
1235 | ||
1236 | if (!extent) { | |
1237 | extent = &s->extents[0]; | |
1238 | } | |
1239 | while (extent < &s->extents[s->num_extents]) { | |
1240 | if (sector_num < extent->end_sector) { | |
1241 | return extent; | |
1242 | } | |
1243 | extent++; | |
1244 | } | |
1245 | return NULL; | |
1246 | } | |
1247 | ||
1248 | static int64_t coroutine_fn vmdk_co_get_block_status(BlockDriverState *bs, | |
1249 | int64_t sector_num, int nb_sectors, int *pnum) | |
1250 | { | |
1251 | BDRVVmdkState *s = bs->opaque; | |
1252 | int64_t index_in_cluster, n, ret; | |
1253 | uint64_t offset; | |
1254 | VmdkExtent *extent; | |
1255 | ||
1256 | extent = find_extent(s, sector_num, NULL); | |
1257 | if (!extent) { | |
1258 | return 0; | |
1259 | } | |
1260 | qemu_co_mutex_lock(&s->lock); | |
1261 | ret = get_cluster_offset(bs, extent, NULL, | |
1262 | sector_num * 512, false, &offset, | |
1263 | 0, 0); | |
1264 | qemu_co_mutex_unlock(&s->lock); | |
1265 | ||
1266 | switch (ret) { | |
1267 | case VMDK_ERROR: | |
1268 | ret = -EIO; | |
1269 | break; | |
1270 | case VMDK_UNALLOC: | |
1271 | ret = 0; | |
1272 | break; | |
1273 | case VMDK_ZEROED: | |
1274 | ret = BDRV_BLOCK_ZERO; | |
1275 | break; | |
1276 | case VMDK_OK: | |
1277 | ret = BDRV_BLOCK_DATA; | |
1278 | if (extent->file == bs->file && !extent->compressed) { | |
1279 | ret |= BDRV_BLOCK_OFFSET_VALID | offset; | |
1280 | } | |
1281 | ||
1282 | break; | |
1283 | } | |
1284 | ||
1285 | index_in_cluster = sector_num % extent->cluster_sectors; | |
1286 | n = extent->cluster_sectors - index_in_cluster; | |
1287 | if (n > nb_sectors) { | |
1288 | n = nb_sectors; | |
1289 | } | |
1290 | *pnum = n; | |
1291 | return ret; | |
1292 | } | |
1293 | ||
1294 | static int vmdk_write_extent(VmdkExtent *extent, int64_t cluster_offset, | |
1295 | int64_t offset_in_cluster, const uint8_t *buf, | |
1296 | int nb_sectors, int64_t sector_num) | |
1297 | { | |
1298 | int ret; | |
1299 | VmdkGrainMarker *data = NULL; | |
1300 | uLongf buf_len; | |
1301 | const uint8_t *write_buf = buf; | |
1302 | int write_len = nb_sectors * 512; | |
1303 | ||
1304 | if (extent->compressed) { | |
1305 | if (!extent->has_marker) { | |
1306 | ret = -EINVAL; | |
1307 | goto out; | |
1308 | } | |
1309 | buf_len = (extent->cluster_sectors << 9) * 2; | |
1310 | data = g_malloc(buf_len + sizeof(VmdkGrainMarker)); | |
1311 | if (compress(data->data, &buf_len, buf, nb_sectors << 9) != Z_OK || | |
1312 | buf_len == 0) { | |
1313 | ret = -EINVAL; | |
1314 | goto out; | |
1315 | } | |
1316 | data->lba = sector_num; | |
1317 | data->size = buf_len; | |
1318 | write_buf = (uint8_t *)data; | |
1319 | write_len = buf_len + sizeof(VmdkGrainMarker); | |
1320 | } | |
1321 | ret = bdrv_pwrite(extent->file, | |
1322 | cluster_offset + offset_in_cluster, | |
1323 | write_buf, | |
1324 | write_len); | |
1325 | if (ret != write_len) { | |
1326 | ret = ret < 0 ? ret : -EIO; | |
1327 | goto out; | |
1328 | } | |
1329 | ret = 0; | |
1330 | out: | |
1331 | g_free(data); | |
1332 | return ret; | |
1333 | } | |
1334 | ||
1335 | static int vmdk_read_extent(VmdkExtent *extent, int64_t cluster_offset, | |
1336 | int64_t offset_in_cluster, uint8_t *buf, | |
1337 | int nb_sectors) | |
1338 | { | |
1339 | int ret; | |
1340 | int cluster_bytes, buf_bytes; | |
1341 | uint8_t *cluster_buf, *compressed_data; | |
1342 | uint8_t *uncomp_buf; | |
1343 | uint32_t data_len; | |
1344 | VmdkGrainMarker *marker; | |
1345 | uLongf buf_len; | |
1346 | ||
1347 | ||
1348 | if (!extent->compressed) { | |
1349 | ret = bdrv_pread(extent->file, | |
1350 | cluster_offset + offset_in_cluster, | |
1351 | buf, nb_sectors * 512); | |
1352 | if (ret == nb_sectors * 512) { | |
1353 | return 0; | |
1354 | } else { | |
1355 | return -EIO; | |
1356 | } | |
1357 | } | |
1358 | cluster_bytes = extent->cluster_sectors * 512; | |
1359 | /* Read two clusters in case GrainMarker + compressed data > one cluster */ | |
1360 | buf_bytes = cluster_bytes * 2; | |
1361 | cluster_buf = g_malloc(buf_bytes); | |
1362 | uncomp_buf = g_malloc(cluster_bytes); | |
1363 | ret = bdrv_pread(extent->file, | |
1364 | cluster_offset, | |
1365 | cluster_buf, buf_bytes); | |
1366 | if (ret < 0) { | |
1367 | goto out; | |
1368 | } | |
1369 | compressed_data = cluster_buf; | |
1370 | buf_len = cluster_bytes; | |
1371 | data_len = cluster_bytes; | |
1372 | if (extent->has_marker) { | |
1373 | marker = (VmdkGrainMarker *)cluster_buf; | |
1374 | compressed_data = marker->data; | |
1375 | data_len = le32_to_cpu(marker->size); | |
1376 | } | |
1377 | if (!data_len || data_len > buf_bytes) { | |
1378 | ret = -EINVAL; | |
1379 | goto out; | |
1380 | } | |
1381 | ret = uncompress(uncomp_buf, &buf_len, compressed_data, data_len); | |
1382 | if (ret != Z_OK) { | |
1383 | ret = -EINVAL; | |
1384 | goto out; | |
1385 | ||
1386 | } | |
1387 | if (offset_in_cluster < 0 || | |
1388 | offset_in_cluster + nb_sectors * 512 > buf_len) { | |
1389 | ret = -EINVAL; | |
1390 | goto out; | |
1391 | } | |
1392 | memcpy(buf, uncomp_buf + offset_in_cluster, nb_sectors * 512); | |
1393 | ret = 0; | |
1394 | ||
1395 | out: | |
1396 | g_free(uncomp_buf); | |
1397 | g_free(cluster_buf); | |
1398 | return ret; | |
1399 | } | |
1400 | ||
1401 | static int vmdk_read(BlockDriverState *bs, int64_t sector_num, | |
1402 | uint8_t *buf, int nb_sectors) | |
1403 | { | |
1404 | BDRVVmdkState *s = bs->opaque; | |
1405 | int ret; | |
1406 | uint64_t n, index_in_cluster; | |
1407 | uint64_t extent_begin_sector, extent_relative_sector_num; | |
1408 | VmdkExtent *extent = NULL; | |
1409 | uint64_t cluster_offset; | |
1410 | ||
1411 | while (nb_sectors > 0) { | |
1412 | extent = find_extent(s, sector_num, extent); | |
1413 | if (!extent) { | |
1414 | return -EIO; | |
1415 | } | |
1416 | ret = get_cluster_offset(bs, extent, NULL, | |
1417 | sector_num << 9, false, &cluster_offset, | |
1418 | 0, 0); | |
1419 | extent_begin_sector = extent->end_sector - extent->sectors; | |
1420 | extent_relative_sector_num = sector_num - extent_begin_sector; | |
1421 | index_in_cluster = extent_relative_sector_num % extent->cluster_sectors; | |
1422 | n = extent->cluster_sectors - index_in_cluster; | |
1423 | if (n > nb_sectors) { | |
1424 | n = nb_sectors; | |
1425 | } | |
1426 | if (ret != VMDK_OK) { | |
1427 | /* if not allocated, try to read from parent image, if exist */ | |
1428 | if (bs->backing_hd && ret != VMDK_ZEROED) { | |
1429 | if (!vmdk_is_cid_valid(bs)) { | |
1430 | return -EINVAL; | |
1431 | } | |
1432 | ret = bdrv_read(bs->backing_hd, sector_num, buf, n); | |
1433 | if (ret < 0) { | |
1434 | return ret; | |
1435 | } | |
1436 | } else { | |
1437 | memset(buf, 0, 512 * n); | |
1438 | } | |
1439 | } else { | |
1440 | ret = vmdk_read_extent(extent, | |
1441 | cluster_offset, index_in_cluster * 512, | |
1442 | buf, n); | |
1443 | if (ret) { | |
1444 | return ret; | |
1445 | } | |
1446 | } | |
1447 | nb_sectors -= n; | |
1448 | sector_num += n; | |
1449 | buf += n * 512; | |
1450 | } | |
1451 | return 0; | |
1452 | } | |
1453 | ||
1454 | static coroutine_fn int vmdk_co_read(BlockDriverState *bs, int64_t sector_num, | |
1455 | uint8_t *buf, int nb_sectors) | |
1456 | { | |
1457 | int ret; | |
1458 | BDRVVmdkState *s = bs->opaque; | |
1459 | qemu_co_mutex_lock(&s->lock); | |
1460 | ret = vmdk_read(bs, sector_num, buf, nb_sectors); | |
1461 | qemu_co_mutex_unlock(&s->lock); | |
1462 | return ret; | |
1463 | } | |
1464 | ||
1465 | /** | |
1466 | * vmdk_write: | |
1467 | * @zeroed: buf is ignored (data is zero), use zeroed_grain GTE feature | |
1468 | * if possible, otherwise return -ENOTSUP. | |
1469 | * @zero_dry_run: used for zeroed == true only, don't update L2 table, just try | |
1470 | * with each cluster. By dry run we can find if the zero write | |
1471 | * is possible without modifying image data. | |
1472 | * | |
1473 | * Returns: error code with 0 for success. | |
1474 | */ | |
1475 | static int vmdk_write(BlockDriverState *bs, int64_t sector_num, | |
1476 | const uint8_t *buf, int nb_sectors, | |
1477 | bool zeroed, bool zero_dry_run) | |
1478 | { | |
1479 | BDRVVmdkState *s = bs->opaque; | |
1480 | VmdkExtent *extent = NULL; | |
1481 | int ret; | |
1482 | int64_t index_in_cluster, n; | |
1483 | uint64_t extent_begin_sector, extent_relative_sector_num; | |
1484 | uint64_t cluster_offset; | |
1485 | VmdkMetaData m_data; | |
1486 | ||
1487 | if (sector_num > bs->total_sectors) { | |
1488 | error_report("Wrong offset: sector_num=0x%" PRIx64 | |
1489 | " total_sectors=0x%" PRIx64 "\n", | |
1490 | sector_num, bs->total_sectors); | |
1491 | return -EIO; | |
1492 | } | |
1493 | ||
1494 | while (nb_sectors > 0) { | |
1495 | extent = find_extent(s, sector_num, extent); | |
1496 | if (!extent) { | |
1497 | return -EIO; | |
1498 | } | |
1499 | extent_begin_sector = extent->end_sector - extent->sectors; | |
1500 | extent_relative_sector_num = sector_num - extent_begin_sector; | |
1501 | index_in_cluster = extent_relative_sector_num % extent->cluster_sectors; | |
1502 | n = extent->cluster_sectors - index_in_cluster; | |
1503 | if (n > nb_sectors) { | |
1504 | n = nb_sectors; | |
1505 | } | |
1506 | ret = get_cluster_offset(bs, extent, &m_data, sector_num << 9, | |
1507 | !(extent->compressed || zeroed), | |
1508 | &cluster_offset, | |
1509 | index_in_cluster, index_in_cluster + n); | |
1510 | if (extent->compressed) { | |
1511 | if (ret == VMDK_OK) { | |
1512 | /* Refuse write to allocated cluster for streamOptimized */ | |
1513 | error_report("Could not write to allocated cluster" | |
1514 | " for streamOptimized"); | |
1515 | return -EIO; | |
1516 | } else { | |
1517 | /* allocate */ | |
1518 | ret = get_cluster_offset(bs, extent, &m_data, sector_num << 9, | |
1519 | true, &cluster_offset, 0, 0); | |
1520 | } | |
1521 | } | |
1522 | if (ret == VMDK_ERROR) { | |
1523 | return -EINVAL; | |
1524 | } | |
1525 | if (zeroed) { | |
1526 | /* Do zeroed write, buf is ignored */ | |
1527 | if (extent->has_zero_grain && | |
1528 | index_in_cluster == 0 && | |
1529 | n >= extent->cluster_sectors) { | |
1530 | n = extent->cluster_sectors; | |
1531 | if (!zero_dry_run) { | |
1532 | /* update L2 tables */ | |
1533 | if (vmdk_L2update(extent, &m_data, VMDK_GTE_ZEROED) | |
1534 | != VMDK_OK) { | |
1535 | return -EIO; | |
1536 | } | |
1537 | } | |
1538 | } else { | |
1539 | return -ENOTSUP; | |
1540 | } | |
1541 | } else { | |
1542 | ret = vmdk_write_extent(extent, | |
1543 | cluster_offset, index_in_cluster * 512, | |
1544 | buf, n, sector_num); | |
1545 | if (ret) { | |
1546 | return ret; | |
1547 | } | |
1548 | if (m_data.valid) { | |
1549 | /* update L2 tables */ | |
1550 | if (vmdk_L2update(extent, &m_data, | |
1551 | cluster_offset >> BDRV_SECTOR_BITS) | |
1552 | != VMDK_OK) { | |
1553 | return -EIO; | |
1554 | } | |
1555 | } | |
1556 | } | |
1557 | nb_sectors -= n; | |
1558 | sector_num += n; | |
1559 | buf += n * 512; | |
1560 | ||
1561 | /* update CID on the first write every time the virtual disk is | |
1562 | * opened */ | |
1563 | if (!s->cid_updated) { | |
1564 | ret = vmdk_write_cid(bs, g_random_int()); | |
1565 | if (ret < 0) { | |
1566 | return ret; | |
1567 | } | |
1568 | s->cid_updated = true; | |
1569 | } | |
1570 | } | |
1571 | return 0; | |
1572 | } | |
1573 | ||
1574 | static coroutine_fn int vmdk_co_write(BlockDriverState *bs, int64_t sector_num, | |
1575 | const uint8_t *buf, int nb_sectors) | |
1576 | { | |
1577 | int ret; | |
1578 | BDRVVmdkState *s = bs->opaque; | |
1579 | qemu_co_mutex_lock(&s->lock); | |
1580 | ret = vmdk_write(bs, sector_num, buf, nb_sectors, false, false); | |
1581 | qemu_co_mutex_unlock(&s->lock); | |
1582 | return ret; | |
1583 | } | |
1584 | ||
1585 | static int vmdk_write_compressed(BlockDriverState *bs, | |
1586 | int64_t sector_num, | |
1587 | const uint8_t *buf, | |
1588 | int nb_sectors) | |
1589 | { | |
1590 | BDRVVmdkState *s = bs->opaque; | |
1591 | if (s->num_extents == 1 && s->extents[0].compressed) { | |
1592 | return vmdk_write(bs, sector_num, buf, nb_sectors, false, false); | |
1593 | } else { | |
1594 | return -ENOTSUP; | |
1595 | } | |
1596 | } | |
1597 | ||
1598 | static int coroutine_fn vmdk_co_write_zeroes(BlockDriverState *bs, | |
1599 | int64_t sector_num, | |
1600 | int nb_sectors, | |
1601 | BdrvRequestFlags flags) | |
1602 | { | |
1603 | int ret; | |
1604 | BDRVVmdkState *s = bs->opaque; | |
1605 | qemu_co_mutex_lock(&s->lock); | |
1606 | /* write zeroes could fail if sectors not aligned to cluster, test it with | |
1607 | * dry_run == true before really updating image */ | |
1608 | ret = vmdk_write(bs, sector_num, NULL, nb_sectors, true, true); | |
1609 | if (!ret) { | |
1610 | ret = vmdk_write(bs, sector_num, NULL, nb_sectors, true, false); | |
1611 | } | |
1612 | qemu_co_mutex_unlock(&s->lock); | |
1613 | return ret; | |
1614 | } | |
1615 | ||
1616 | static int vmdk_create_extent(const char *filename, int64_t filesize, | |
1617 | bool flat, bool compress, bool zeroed_grain, | |
1618 | QemuOpts *opts, Error **errp) | |
1619 | { | |
1620 | int ret, i; | |
1621 | BlockDriverState *bs = NULL; | |
1622 | VMDK4Header header; | |
1623 | Error *local_err = NULL; | |
1624 | uint32_t tmp, magic, grains, gd_sectors, gt_size, gt_count; | |
1625 | uint32_t *gd_buf = NULL; | |
1626 | int gd_buf_size; | |
1627 | ||
1628 | ret = bdrv_create_file(filename, opts, &local_err); | |
1629 | if (ret < 0) { | |
1630 | error_propagate(errp, local_err); | |
1631 | goto exit; | |
1632 | } | |
1633 | ||
1634 | assert(bs == NULL); | |
1635 | ret = bdrv_open(&bs, filename, NULL, NULL, BDRV_O_RDWR | BDRV_O_PROTOCOL, | |
1636 | NULL, &local_err); | |
1637 | if (ret < 0) { | |
1638 | error_propagate(errp, local_err); | |
1639 | goto exit; | |
1640 | } | |
1641 | ||
1642 | if (flat) { | |
1643 | ret = bdrv_truncate(bs, filesize); | |
1644 | if (ret < 0) { | |
1645 | error_setg_errno(errp, -ret, "Could not truncate file"); | |
1646 | } | |
1647 | goto exit; | |
1648 | } | |
1649 | magic = cpu_to_be32(VMDK4_MAGIC); | |
1650 | memset(&header, 0, sizeof(header)); | |
1651 | header.version = zeroed_grain ? 2 : 1; | |
1652 | header.flags = VMDK4_FLAG_RGD | VMDK4_FLAG_NL_DETECT | |
1653 | | (compress ? VMDK4_FLAG_COMPRESS | VMDK4_FLAG_MARKER : 0) | |
1654 | | (zeroed_grain ? VMDK4_FLAG_ZERO_GRAIN : 0); | |
1655 | header.compressAlgorithm = compress ? VMDK4_COMPRESSION_DEFLATE : 0; | |
1656 | header.capacity = filesize / BDRV_SECTOR_SIZE; | |
1657 | header.granularity = 128; | |
1658 | header.num_gtes_per_gt = BDRV_SECTOR_SIZE; | |
1659 | ||
1660 | grains = DIV_ROUND_UP(filesize / BDRV_SECTOR_SIZE, header.granularity); | |
1661 | gt_size = DIV_ROUND_UP(header.num_gtes_per_gt * sizeof(uint32_t), | |
1662 | BDRV_SECTOR_SIZE); | |
1663 | gt_count = DIV_ROUND_UP(grains, header.num_gtes_per_gt); | |
1664 | gd_sectors = DIV_ROUND_UP(gt_count * sizeof(uint32_t), BDRV_SECTOR_SIZE); | |
1665 | ||
1666 | header.desc_offset = 1; | |
1667 | header.desc_size = 20; | |
1668 | header.rgd_offset = header.desc_offset + header.desc_size; | |
1669 | header.gd_offset = header.rgd_offset + gd_sectors + (gt_size * gt_count); | |
1670 | header.grain_offset = | |
1671 | ROUND_UP(header.gd_offset + gd_sectors + (gt_size * gt_count), | |
1672 | header.granularity); | |
1673 | /* swap endianness for all header fields */ | |
1674 | header.version = cpu_to_le32(header.version); | |
1675 | header.flags = cpu_to_le32(header.flags); | |
1676 | header.capacity = cpu_to_le64(header.capacity); | |
1677 | header.granularity = cpu_to_le64(header.granularity); | |
1678 | header.num_gtes_per_gt = cpu_to_le32(header.num_gtes_per_gt); | |
1679 | header.desc_offset = cpu_to_le64(header.desc_offset); | |
1680 | header.desc_size = cpu_to_le64(header.desc_size); | |
1681 | header.rgd_offset = cpu_to_le64(header.rgd_offset); | |
1682 | header.gd_offset = cpu_to_le64(header.gd_offset); | |
1683 | header.grain_offset = cpu_to_le64(header.grain_offset); | |
1684 | header.compressAlgorithm = cpu_to_le16(header.compressAlgorithm); | |
1685 | ||
1686 | header.check_bytes[0] = 0xa; | |
1687 | header.check_bytes[1] = 0x20; | |
1688 | header.check_bytes[2] = 0xd; | |
1689 | header.check_bytes[3] = 0xa; | |
1690 | ||
1691 | /* write all the data */ | |
1692 | ret = bdrv_pwrite(bs, 0, &magic, sizeof(magic)); | |
1693 | if (ret < 0) { | |
1694 | error_set(errp, QERR_IO_ERROR); | |
1695 | goto exit; | |
1696 | } | |
1697 | ret = bdrv_pwrite(bs, sizeof(magic), &header, sizeof(header)); | |
1698 | if (ret < 0) { | |
1699 | error_set(errp, QERR_IO_ERROR); | |
1700 | goto exit; | |
1701 | } | |
1702 | ||
1703 | ret = bdrv_truncate(bs, le64_to_cpu(header.grain_offset) << 9); | |
1704 | if (ret < 0) { | |
1705 | error_setg_errno(errp, -ret, "Could not truncate file"); | |
1706 | goto exit; | |
1707 | } | |
1708 | ||
1709 | /* write grain directory */ | |
1710 | gd_buf_size = gd_sectors * BDRV_SECTOR_SIZE; | |
1711 | gd_buf = g_malloc0(gd_buf_size); | |
1712 | for (i = 0, tmp = le64_to_cpu(header.rgd_offset) + gd_sectors; | |
1713 | i < gt_count; i++, tmp += gt_size) { | |
1714 | gd_buf[i] = cpu_to_le32(tmp); | |
1715 | } | |
1716 | ret = bdrv_pwrite(bs, le64_to_cpu(header.rgd_offset) * BDRV_SECTOR_SIZE, | |
1717 | gd_buf, gd_buf_size); | |
1718 | if (ret < 0) { | |
1719 | error_set(errp, QERR_IO_ERROR); | |
1720 | goto exit; | |
1721 | } | |
1722 | ||
1723 | /* write backup grain directory */ | |
1724 | for (i = 0, tmp = le64_to_cpu(header.gd_offset) + gd_sectors; | |
1725 | i < gt_count; i++, tmp += gt_size) { | |
1726 | gd_buf[i] = cpu_to_le32(tmp); | |
1727 | } | |
1728 | ret = bdrv_pwrite(bs, le64_to_cpu(header.gd_offset) * BDRV_SECTOR_SIZE, | |
1729 | gd_buf, gd_buf_size); | |
1730 | if (ret < 0) { | |
1731 | error_set(errp, QERR_IO_ERROR); | |
1732 | goto exit; | |
1733 | } | |
1734 | ||
1735 | ret = 0; | |
1736 | exit: | |
1737 | if (bs) { | |
1738 | bdrv_unref(bs); | |
1739 | } | |
1740 | g_free(gd_buf); | |
1741 | return ret; | |
1742 | } | |
1743 | ||
1744 | static int filename_decompose(const char *filename, char *path, char *prefix, | |
1745 | char *postfix, size_t buf_len, Error **errp) | |
1746 | { | |
1747 | const char *p, *q; | |
1748 | ||
1749 | if (filename == NULL || !strlen(filename)) { | |
1750 | error_setg(errp, "No filename provided"); | |
1751 | return VMDK_ERROR; | |
1752 | } | |
1753 | p = strrchr(filename, '/'); | |
1754 | if (p == NULL) { | |
1755 | p = strrchr(filename, '\\'); | |
1756 | } | |
1757 | if (p == NULL) { | |
1758 | p = strrchr(filename, ':'); | |
1759 | } | |
1760 | if (p != NULL) { | |
1761 | p++; | |
1762 | if (p - filename >= buf_len) { | |
1763 | return VMDK_ERROR; | |
1764 | } | |
1765 | pstrcpy(path, p - filename + 1, filename); | |
1766 | } else { | |
1767 | p = filename; | |
1768 | path[0] = '\0'; | |
1769 | } | |
1770 | q = strrchr(p, '.'); | |
1771 | if (q == NULL) { | |
1772 | pstrcpy(prefix, buf_len, p); | |
1773 | postfix[0] = '\0'; | |
1774 | } else { | |
1775 | if (q - p >= buf_len) { | |
1776 | return VMDK_ERROR; | |
1777 | } | |
1778 | pstrcpy(prefix, q - p + 1, p); | |
1779 | pstrcpy(postfix, buf_len, q); | |
1780 | } | |
1781 | return VMDK_OK; | |
1782 | } | |
1783 | ||
1784 | static int vmdk_create(const char *filename, QemuOpts *opts, Error **errp) | |
1785 | { | |
1786 | int idx = 0; | |
1787 | BlockDriverState *new_bs = NULL; | |
1788 | Error *local_err = NULL; | |
1789 | char *desc = NULL; | |
1790 | int64_t total_size = 0, filesize; | |
1791 | char *adapter_type = NULL; | |
1792 | char *backing_file = NULL; | |
1793 | char *fmt = NULL; | |
1794 | int flags = 0; | |
1795 | int ret = 0; | |
1796 | bool flat, split, compress; | |
1797 | GString *ext_desc_lines; | |
1798 | char path[PATH_MAX], prefix[PATH_MAX], postfix[PATH_MAX]; | |
1799 | const int64_t split_size = 0x80000000; /* VMDK has constant split size */ | |
1800 | const char *desc_extent_line; | |
1801 | char parent_desc_line[BUF_SIZE] = ""; | |
1802 | uint32_t parent_cid = 0xffffffff; | |
1803 | uint32_t number_heads = 16; | |
1804 | bool zeroed_grain = false; | |
1805 | uint32_t desc_offset = 0, desc_len; | |
1806 | const char desc_template[] = | |
1807 | "# Disk DescriptorFile\n" | |
1808 | "version=1\n" | |
1809 | "CID=%" PRIx32 "\n" | |
1810 | "parentCID=%" PRIx32 "\n" | |
1811 | "createType=\"%s\"\n" | |
1812 | "%s" | |
1813 | "\n" | |
1814 | "# Extent description\n" | |
1815 | "%s" | |
1816 | "\n" | |
1817 | "# The Disk Data Base\n" | |
1818 | "#DDB\n" | |
1819 | "\n" | |
1820 | "ddb.virtualHWVersion = \"%d\"\n" | |
1821 | "ddb.geometry.cylinders = \"%" PRId64 "\"\n" | |
1822 | "ddb.geometry.heads = \"%" PRIu32 "\"\n" | |
1823 | "ddb.geometry.sectors = \"63\"\n" | |
1824 | "ddb.adapterType = \"%s\"\n"; | |
1825 | ||
1826 | ext_desc_lines = g_string_new(NULL); | |
1827 | ||
1828 | if (filename_decompose(filename, path, prefix, postfix, PATH_MAX, errp)) { | |
1829 | ret = -EINVAL; | |
1830 | goto exit; | |
1831 | } | |
1832 | /* Read out options */ | |
1833 | total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), | |
1834 | BDRV_SECTOR_SIZE); | |
1835 | adapter_type = qemu_opt_get_del(opts, BLOCK_OPT_ADAPTER_TYPE); | |
1836 | backing_file = qemu_opt_get_del(opts, BLOCK_OPT_BACKING_FILE); | |
1837 | if (qemu_opt_get_bool_del(opts, BLOCK_OPT_COMPAT6, false)) { | |
1838 | flags |= BLOCK_FLAG_COMPAT6; | |
1839 | } | |
1840 | fmt = qemu_opt_get_del(opts, BLOCK_OPT_SUBFMT); | |
1841 | if (qemu_opt_get_bool_del(opts, BLOCK_OPT_ZEROED_GRAIN, false)) { | |
1842 | zeroed_grain = true; | |
1843 | } | |
1844 | ||
1845 | if (!adapter_type) { | |
1846 | adapter_type = g_strdup("ide"); | |
1847 | } else if (strcmp(adapter_type, "ide") && | |
1848 | strcmp(adapter_type, "buslogic") && | |
1849 | strcmp(adapter_type, "lsilogic") && | |
1850 | strcmp(adapter_type, "legacyESX")) { | |
1851 | error_setg(errp, "Unknown adapter type: '%s'", adapter_type); | |
1852 | ret = -EINVAL; | |
1853 | goto exit; | |
1854 | } | |
1855 | if (strcmp(adapter_type, "ide") != 0) { | |
1856 | /* that's the number of heads with which vmware operates when | |
1857 | creating, exporting, etc. vmdk files with a non-ide adapter type */ | |
1858 | number_heads = 255; | |
1859 | } | |
1860 | if (!fmt) { | |
1861 | /* Default format to monolithicSparse */ | |
1862 | fmt = g_strdup("monolithicSparse"); | |
1863 | } else if (strcmp(fmt, "monolithicFlat") && | |
1864 | strcmp(fmt, "monolithicSparse") && | |
1865 | strcmp(fmt, "twoGbMaxExtentSparse") && | |
1866 | strcmp(fmt, "twoGbMaxExtentFlat") && | |
1867 | strcmp(fmt, "streamOptimized")) { | |
1868 | error_setg(errp, "Unknown subformat: '%s'", fmt); | |
1869 | ret = -EINVAL; | |
1870 | goto exit; | |
1871 | } | |
1872 | split = !(strcmp(fmt, "twoGbMaxExtentFlat") && | |
1873 | strcmp(fmt, "twoGbMaxExtentSparse")); | |
1874 | flat = !(strcmp(fmt, "monolithicFlat") && | |
1875 | strcmp(fmt, "twoGbMaxExtentFlat")); | |
1876 | compress = !strcmp(fmt, "streamOptimized"); | |
1877 | if (flat) { | |
1878 | desc_extent_line = "RW %" PRId64 " FLAT \"%s\" 0\n"; | |
1879 | } else { | |
1880 | desc_extent_line = "RW %" PRId64 " SPARSE \"%s\"\n"; | |
1881 | } | |
1882 | if (flat && backing_file) { | |
1883 | error_setg(errp, "Flat image can't have backing file"); | |
1884 | ret = -ENOTSUP; | |
1885 | goto exit; | |
1886 | } | |
1887 | if (flat && zeroed_grain) { | |
1888 | error_setg(errp, "Flat image can't enable zeroed grain"); | |
1889 | ret = -ENOTSUP; | |
1890 | goto exit; | |
1891 | } | |
1892 | if (backing_file) { | |
1893 | BlockDriverState *bs = NULL; | |
1894 | ret = bdrv_open(&bs, backing_file, NULL, NULL, BDRV_O_NO_BACKING, NULL, | |
1895 | errp); | |
1896 | if (ret != 0) { | |
1897 | goto exit; | |
1898 | } | |
1899 | if (strcmp(bs->drv->format_name, "vmdk")) { | |
1900 | bdrv_unref(bs); | |
1901 | ret = -EINVAL; | |
1902 | goto exit; | |
1903 | } | |
1904 | parent_cid = vmdk_read_cid(bs, 0); | |
1905 | bdrv_unref(bs); | |
1906 | snprintf(parent_desc_line, sizeof(parent_desc_line), | |
1907 | "parentFileNameHint=\"%s\"", backing_file); | |
1908 | } | |
1909 | ||
1910 | /* Create extents */ | |
1911 | filesize = total_size; | |
1912 | while (filesize > 0) { | |
1913 | char desc_line[BUF_SIZE]; | |
1914 | char ext_filename[PATH_MAX]; | |
1915 | char desc_filename[PATH_MAX]; | |
1916 | int64_t size = filesize; | |
1917 | ||
1918 | if (split && size > split_size) { | |
1919 | size = split_size; | |
1920 | } | |
1921 | if (split) { | |
1922 | snprintf(desc_filename, sizeof(desc_filename), "%s-%c%03d%s", | |
1923 | prefix, flat ? 'f' : 's', ++idx, postfix); | |
1924 | } else if (flat) { | |
1925 | snprintf(desc_filename, sizeof(desc_filename), "%s-flat%s", | |
1926 | prefix, postfix); | |
1927 | } else { | |
1928 | snprintf(desc_filename, sizeof(desc_filename), "%s%s", | |
1929 | prefix, postfix); | |
1930 | } | |
1931 | snprintf(ext_filename, sizeof(ext_filename), "%s%s", | |
1932 | path, desc_filename); | |
1933 | ||
1934 | if (vmdk_create_extent(ext_filename, size, | |
1935 | flat, compress, zeroed_grain, opts, errp)) { | |
1936 | ret = -EINVAL; | |
1937 | goto exit; | |
1938 | } | |
1939 | filesize -= size; | |
1940 | ||
1941 | /* Format description line */ | |
1942 | snprintf(desc_line, sizeof(desc_line), | |
1943 | desc_extent_line, size / BDRV_SECTOR_SIZE, desc_filename); | |
1944 | g_string_append(ext_desc_lines, desc_line); | |
1945 | } | |
1946 | /* generate descriptor file */ | |
1947 | desc = g_strdup_printf(desc_template, | |
1948 | g_random_int(), | |
1949 | parent_cid, | |
1950 | fmt, | |
1951 | parent_desc_line, | |
1952 | ext_desc_lines->str, | |
1953 | (flags & BLOCK_FLAG_COMPAT6 ? 6 : 4), | |
1954 | total_size / | |
1955 | (int64_t)(63 * number_heads * BDRV_SECTOR_SIZE), | |
1956 | number_heads, | |
1957 | adapter_type); | |
1958 | desc_len = strlen(desc); | |
1959 | /* the descriptor offset = 0x200 */ | |
1960 | if (!split && !flat) { | |
1961 | desc_offset = 0x200; | |
1962 | } else { | |
1963 | ret = bdrv_create_file(filename, opts, &local_err); | |
1964 | if (ret < 0) { | |
1965 | error_propagate(errp, local_err); | |
1966 | goto exit; | |
1967 | } | |
1968 | } | |
1969 | assert(new_bs == NULL); | |
1970 | ret = bdrv_open(&new_bs, filename, NULL, NULL, | |
1971 | BDRV_O_RDWR | BDRV_O_PROTOCOL, NULL, &local_err); | |
1972 | if (ret < 0) { | |
1973 | error_propagate(errp, local_err); | |
1974 | goto exit; | |
1975 | } | |
1976 | ret = bdrv_pwrite(new_bs, desc_offset, desc, desc_len); | |
1977 | if (ret < 0) { | |
1978 | error_setg_errno(errp, -ret, "Could not write description"); | |
1979 | goto exit; | |
1980 | } | |
1981 | /* bdrv_pwrite write padding zeros to align to sector, we don't need that | |
1982 | * for description file */ | |
1983 | if (desc_offset == 0) { | |
1984 | ret = bdrv_truncate(new_bs, desc_len); | |
1985 | if (ret < 0) { | |
1986 | error_setg_errno(errp, -ret, "Could not truncate file"); | |
1987 | } | |
1988 | } | |
1989 | exit: | |
1990 | if (new_bs) { | |
1991 | bdrv_unref(new_bs); | |
1992 | } | |
1993 | g_free(adapter_type); | |
1994 | g_free(backing_file); | |
1995 | g_free(fmt); | |
1996 | g_free(desc); | |
1997 | g_string_free(ext_desc_lines, true); | |
1998 | return ret; | |
1999 | } | |
2000 | ||
2001 | static void vmdk_close(BlockDriverState *bs) | |
2002 | { | |
2003 | BDRVVmdkState *s = bs->opaque; | |
2004 | ||
2005 | vmdk_free_extents(bs); | |
2006 | g_free(s->create_type); | |
2007 | ||
2008 | migrate_del_blocker(s->migration_blocker); | |
2009 | error_free(s->migration_blocker); | |
2010 | } | |
2011 | ||
2012 | static coroutine_fn int vmdk_co_flush(BlockDriverState *bs) | |
2013 | { | |
2014 | BDRVVmdkState *s = bs->opaque; | |
2015 | int i, err; | |
2016 | int ret = 0; | |
2017 | ||
2018 | for (i = 0; i < s->num_extents; i++) { | |
2019 | err = bdrv_co_flush(s->extents[i].file); | |
2020 | if (err < 0) { | |
2021 | ret = err; | |
2022 | } | |
2023 | } | |
2024 | return ret; | |
2025 | } | |
2026 | ||
2027 | static int64_t vmdk_get_allocated_file_size(BlockDriverState *bs) | |
2028 | { | |
2029 | int i; | |
2030 | int64_t ret = 0; | |
2031 | int64_t r; | |
2032 | BDRVVmdkState *s = bs->opaque; | |
2033 | ||
2034 | ret = bdrv_get_allocated_file_size(bs->file); | |
2035 | if (ret < 0) { | |
2036 | return ret; | |
2037 | } | |
2038 | for (i = 0; i < s->num_extents; i++) { | |
2039 | if (s->extents[i].file == bs->file) { | |
2040 | continue; | |
2041 | } | |
2042 | r = bdrv_get_allocated_file_size(s->extents[i].file); | |
2043 | if (r < 0) { | |
2044 | return r; | |
2045 | } | |
2046 | ret += r; | |
2047 | } | |
2048 | return ret; | |
2049 | } | |
2050 | ||
2051 | static int vmdk_has_zero_init(BlockDriverState *bs) | |
2052 | { | |
2053 | int i; | |
2054 | BDRVVmdkState *s = bs->opaque; | |
2055 | ||
2056 | /* If has a flat extent and its underlying storage doesn't have zero init, | |
2057 | * return 0. */ | |
2058 | for (i = 0; i < s->num_extents; i++) { | |
2059 | if (s->extents[i].flat) { | |
2060 | if (!bdrv_has_zero_init(s->extents[i].file)) { | |
2061 | return 0; | |
2062 | } | |
2063 | } | |
2064 | } | |
2065 | return 1; | |
2066 | } | |
2067 | ||
2068 | static ImageInfo *vmdk_get_extent_info(VmdkExtent *extent) | |
2069 | { | |
2070 | ImageInfo *info = g_new0(ImageInfo, 1); | |
2071 | ||
2072 | *info = (ImageInfo){ | |
2073 | .filename = g_strdup(extent->file->filename), | |
2074 | .format = g_strdup(extent->type), | |
2075 | .virtual_size = extent->sectors * BDRV_SECTOR_SIZE, | |
2076 | .compressed = extent->compressed, | |
2077 | .has_compressed = extent->compressed, | |
2078 | .cluster_size = extent->cluster_sectors * BDRV_SECTOR_SIZE, | |
2079 | .has_cluster_size = !extent->flat, | |
2080 | }; | |
2081 | ||
2082 | return info; | |
2083 | } | |
2084 | ||
2085 | static int vmdk_check(BlockDriverState *bs, BdrvCheckResult *result, | |
2086 | BdrvCheckMode fix) | |
2087 | { | |
2088 | BDRVVmdkState *s = bs->opaque; | |
2089 | VmdkExtent *extent = NULL; | |
2090 | int64_t sector_num = 0; | |
2091 | int64_t total_sectors = bdrv_nb_sectors(bs); | |
2092 | int ret; | |
2093 | uint64_t cluster_offset; | |
2094 | ||
2095 | if (fix) { | |
2096 | return -ENOTSUP; | |
2097 | } | |
2098 | ||
2099 | for (;;) { | |
2100 | if (sector_num >= total_sectors) { | |
2101 | return 0; | |
2102 | } | |
2103 | extent = find_extent(s, sector_num, extent); | |
2104 | if (!extent) { | |
2105 | fprintf(stderr, | |
2106 | "ERROR: could not find extent for sector %" PRId64 "\n", | |
2107 | sector_num); | |
2108 | break; | |
2109 | } | |
2110 | ret = get_cluster_offset(bs, extent, NULL, | |
2111 | sector_num << BDRV_SECTOR_BITS, | |
2112 | false, &cluster_offset, 0, 0); | |
2113 | if (ret == VMDK_ERROR) { | |
2114 | fprintf(stderr, | |
2115 | "ERROR: could not get cluster_offset for sector %" | |
2116 | PRId64 "\n", sector_num); | |
2117 | break; | |
2118 | } | |
2119 | if (ret == VMDK_OK && cluster_offset >= bdrv_getlength(extent->file)) { | |
2120 | fprintf(stderr, | |
2121 | "ERROR: cluster offset for sector %" | |
2122 | PRId64 " points after EOF\n", sector_num); | |
2123 | break; | |
2124 | } | |
2125 | sector_num += extent->cluster_sectors; | |
2126 | } | |
2127 | ||
2128 | result->corruptions++; | |
2129 | return 0; | |
2130 | } | |
2131 | ||
2132 | static ImageInfoSpecific *vmdk_get_specific_info(BlockDriverState *bs) | |
2133 | { | |
2134 | int i; | |
2135 | BDRVVmdkState *s = bs->opaque; | |
2136 | ImageInfoSpecific *spec_info = g_new0(ImageInfoSpecific, 1); | |
2137 | ImageInfoList **next; | |
2138 | ||
2139 | *spec_info = (ImageInfoSpecific){ | |
2140 | .kind = IMAGE_INFO_SPECIFIC_KIND_VMDK, | |
2141 | { | |
2142 | .vmdk = g_new0(ImageInfoSpecificVmdk, 1), | |
2143 | }, | |
2144 | }; | |
2145 | ||
2146 | *spec_info->vmdk = (ImageInfoSpecificVmdk) { | |
2147 | .create_type = g_strdup(s->create_type), | |
2148 | .cid = s->cid, | |
2149 | .parent_cid = s->parent_cid, | |
2150 | }; | |
2151 | ||
2152 | next = &spec_info->vmdk->extents; | |
2153 | for (i = 0; i < s->num_extents; i++) { | |
2154 | *next = g_new0(ImageInfoList, 1); | |
2155 | (*next)->value = vmdk_get_extent_info(&s->extents[i]); | |
2156 | (*next)->next = NULL; | |
2157 | next = &(*next)->next; | |
2158 | } | |
2159 | ||
2160 | return spec_info; | |
2161 | } | |
2162 | ||
2163 | static bool vmdk_extents_type_eq(const VmdkExtent *a, const VmdkExtent *b) | |
2164 | { | |
2165 | return a->flat == b->flat && | |
2166 | a->compressed == b->compressed && | |
2167 | (a->flat || a->cluster_sectors == b->cluster_sectors); | |
2168 | } | |
2169 | ||
2170 | static int vmdk_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) | |
2171 | { | |
2172 | int i; | |
2173 | BDRVVmdkState *s = bs->opaque; | |
2174 | assert(s->num_extents); | |
2175 | ||
2176 | /* See if we have multiple extents but they have different cases */ | |
2177 | for (i = 1; i < s->num_extents; i++) { | |
2178 | if (!vmdk_extents_type_eq(&s->extents[0], &s->extents[i])) { | |
2179 | return -ENOTSUP; | |
2180 | } | |
2181 | } | |
2182 | bdi->needs_compressed_writes = s->extents[0].compressed; | |
2183 | if (!s->extents[0].flat) { | |
2184 | bdi->cluster_size = s->extents[0].cluster_sectors << BDRV_SECTOR_BITS; | |
2185 | } | |
2186 | return 0; | |
2187 | } | |
2188 | ||
2189 | static void vmdk_detach_aio_context(BlockDriverState *bs) | |
2190 | { | |
2191 | BDRVVmdkState *s = bs->opaque; | |
2192 | int i; | |
2193 | ||
2194 | for (i = 0; i < s->num_extents; i++) { | |
2195 | bdrv_detach_aio_context(s->extents[i].file); | |
2196 | } | |
2197 | } | |
2198 | ||
2199 | static void vmdk_attach_aio_context(BlockDriverState *bs, | |
2200 | AioContext *new_context) | |
2201 | { | |
2202 | BDRVVmdkState *s = bs->opaque; | |
2203 | int i; | |
2204 | ||
2205 | for (i = 0; i < s->num_extents; i++) { | |
2206 | bdrv_attach_aio_context(s->extents[i].file, new_context); | |
2207 | } | |
2208 | } | |
2209 | ||
2210 | static QemuOptsList vmdk_create_opts = { | |
2211 | .name = "vmdk-create-opts", | |
2212 | .head = QTAILQ_HEAD_INITIALIZER(vmdk_create_opts.head), | |
2213 | .desc = { | |
2214 | { | |
2215 | .name = BLOCK_OPT_SIZE, | |
2216 | .type = QEMU_OPT_SIZE, | |
2217 | .help = "Virtual disk size" | |
2218 | }, | |
2219 | { | |
2220 | .name = BLOCK_OPT_ADAPTER_TYPE, | |
2221 | .type = QEMU_OPT_STRING, | |
2222 | .help = "Virtual adapter type, can be one of " | |
2223 | "ide (default), lsilogic, buslogic or legacyESX" | |
2224 | }, | |
2225 | { | |
2226 | .name = BLOCK_OPT_BACKING_FILE, | |
2227 | .type = QEMU_OPT_STRING, | |
2228 | .help = "File name of a base image" | |
2229 | }, | |
2230 | { | |
2231 | .name = BLOCK_OPT_COMPAT6, | |
2232 | .type = QEMU_OPT_BOOL, | |
2233 | .help = "VMDK version 6 image", | |
2234 | .def_value_str = "off" | |
2235 | }, | |
2236 | { | |
2237 | .name = BLOCK_OPT_SUBFMT, | |
2238 | .type = QEMU_OPT_STRING, | |
2239 | .help = | |
2240 | "VMDK flat extent format, can be one of " | |
2241 | "{monolithicSparse (default) | monolithicFlat | twoGbMaxExtentSparse | twoGbMaxExtentFlat | streamOptimized} " | |
2242 | }, | |
2243 | { | |
2244 | .name = BLOCK_OPT_ZEROED_GRAIN, | |
2245 | .type = QEMU_OPT_BOOL, | |
2246 | .help = "Enable efficient zero writes " | |
2247 | "using the zeroed-grain GTE feature" | |
2248 | }, | |
2249 | { /* end of list */ } | |
2250 | } | |
2251 | }; | |
2252 | ||
2253 | static BlockDriver bdrv_vmdk = { | |
2254 | .format_name = "vmdk", | |
2255 | .instance_size = sizeof(BDRVVmdkState), | |
2256 | .bdrv_probe = vmdk_probe, | |
2257 | .bdrv_open = vmdk_open, | |
2258 | .bdrv_check = vmdk_check, | |
2259 | .bdrv_reopen_prepare = vmdk_reopen_prepare, | |
2260 | .bdrv_read = vmdk_co_read, | |
2261 | .bdrv_write = vmdk_co_write, | |
2262 | .bdrv_write_compressed = vmdk_write_compressed, | |
2263 | .bdrv_co_write_zeroes = vmdk_co_write_zeroes, | |
2264 | .bdrv_close = vmdk_close, | |
2265 | .bdrv_create = vmdk_create, | |
2266 | .bdrv_co_flush_to_disk = vmdk_co_flush, | |
2267 | .bdrv_co_get_block_status = vmdk_co_get_block_status, | |
2268 | .bdrv_get_allocated_file_size = vmdk_get_allocated_file_size, | |
2269 | .bdrv_has_zero_init = vmdk_has_zero_init, | |
2270 | .bdrv_get_specific_info = vmdk_get_specific_info, | |
2271 | .bdrv_refresh_limits = vmdk_refresh_limits, | |
2272 | .bdrv_get_info = vmdk_get_info, | |
2273 | .bdrv_detach_aio_context = vmdk_detach_aio_context, | |
2274 | .bdrv_attach_aio_context = vmdk_attach_aio_context, | |
2275 | ||
2276 | .supports_backing = true, | |
2277 | .create_opts = &vmdk_create_opts, | |
2278 | }; | |
2279 | ||
2280 | static void bdrv_vmdk_init(void) | |
2281 | { | |
2282 | bdrv_register(&bdrv_vmdk); | |
2283 | } | |
2284 | ||
2285 | block_init(bdrv_vmdk_init); |