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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_int.h" | |
28 | #include "module.h" | |
29 | #include "zlib.h" | |
30 | ||
31 | #define VMDK3_MAGIC (('C' << 24) | ('O' << 16) | ('W' << 8) | 'D') | |
32 | #define VMDK4_MAGIC (('K' << 24) | ('D' << 16) | ('M' << 8) | 'V') | |
33 | #define VMDK4_COMPRESSION_DEFLATE 1 | |
34 | #define VMDK4_FLAG_COMPRESS (1 << 16) | |
35 | #define VMDK4_FLAG_MARKER (1 << 17) | |
36 | ||
37 | typedef struct { | |
38 | uint32_t version; | |
39 | uint32_t flags; | |
40 | uint32_t disk_sectors; | |
41 | uint32_t granularity; | |
42 | uint32_t l1dir_offset; | |
43 | uint32_t l1dir_size; | |
44 | uint32_t file_sectors; | |
45 | uint32_t cylinders; | |
46 | uint32_t heads; | |
47 | uint32_t sectors_per_track; | |
48 | } VMDK3Header; | |
49 | ||
50 | typedef struct { | |
51 | uint32_t version; | |
52 | uint32_t flags; | |
53 | int64_t capacity; | |
54 | int64_t granularity; | |
55 | int64_t desc_offset; | |
56 | int64_t desc_size; | |
57 | int32_t num_gtes_per_gte; | |
58 | int64_t rgd_offset; | |
59 | int64_t gd_offset; | |
60 | int64_t grain_offset; | |
61 | char filler[1]; | |
62 | char check_bytes[4]; | |
63 | uint16_t compressAlgorithm; | |
64 | } QEMU_PACKED VMDK4Header; | |
65 | ||
66 | #define L2_CACHE_SIZE 16 | |
67 | ||
68 | typedef struct VmdkExtent { | |
69 | BlockDriverState *file; | |
70 | bool flat; | |
71 | bool compressed; | |
72 | bool has_marker; | |
73 | int64_t sectors; | |
74 | int64_t end_sector; | |
75 | int64_t flat_start_offset; | |
76 | int64_t l1_table_offset; | |
77 | int64_t l1_backup_table_offset; | |
78 | uint32_t *l1_table; | |
79 | uint32_t *l1_backup_table; | |
80 | unsigned int l1_size; | |
81 | uint32_t l1_entry_sectors; | |
82 | ||
83 | unsigned int l2_size; | |
84 | uint32_t *l2_cache; | |
85 | uint32_t l2_cache_offsets[L2_CACHE_SIZE]; | |
86 | uint32_t l2_cache_counts[L2_CACHE_SIZE]; | |
87 | ||
88 | unsigned int cluster_sectors; | |
89 | } VmdkExtent; | |
90 | ||
91 | typedef struct BDRVVmdkState { | |
92 | int desc_offset; | |
93 | bool cid_updated; | |
94 | uint32_t parent_cid; | |
95 | int num_extents; | |
96 | /* Extent array with num_extents entries, ascend ordered by address */ | |
97 | VmdkExtent *extents; | |
98 | } BDRVVmdkState; | |
99 | ||
100 | typedef struct VmdkMetaData { | |
101 | uint32_t offset; | |
102 | unsigned int l1_index; | |
103 | unsigned int l2_index; | |
104 | unsigned int l2_offset; | |
105 | int valid; | |
106 | } VmdkMetaData; | |
107 | ||
108 | typedef struct VmdkGrainMarker { | |
109 | uint64_t lba; | |
110 | uint32_t size; | |
111 | uint8_t data[0]; | |
112 | } VmdkGrainMarker; | |
113 | ||
114 | static int vmdk_probe(const uint8_t *buf, int buf_size, const char *filename) | |
115 | { | |
116 | uint32_t magic; | |
117 | ||
118 | if (buf_size < 4) { | |
119 | return 0; | |
120 | } | |
121 | magic = be32_to_cpu(*(uint32_t *)buf); | |
122 | if (magic == VMDK3_MAGIC || | |
123 | magic == VMDK4_MAGIC) { | |
124 | return 100; | |
125 | } else { | |
126 | const char *p = (const char *)buf; | |
127 | const char *end = p + buf_size; | |
128 | while (p < end) { | |
129 | if (*p == '#') { | |
130 | /* skip comment line */ | |
131 | while (p < end && *p != '\n') { | |
132 | p++; | |
133 | } | |
134 | p++; | |
135 | continue; | |
136 | } | |
137 | if (*p == ' ') { | |
138 | while (p < end && *p == ' ') { | |
139 | p++; | |
140 | } | |
141 | /* skip '\r' if windows line endings used. */ | |
142 | if (p < end && *p == '\r') { | |
143 | p++; | |
144 | } | |
145 | /* only accept blank lines before 'version=' line */ | |
146 | if (p == end || *p != '\n') { | |
147 | return 0; | |
148 | } | |
149 | p++; | |
150 | continue; | |
151 | } | |
152 | if (end - p >= strlen("version=X\n")) { | |
153 | if (strncmp("version=1\n", p, strlen("version=1\n")) == 0 || | |
154 | strncmp("version=2\n", p, strlen("version=2\n")) == 0) { | |
155 | return 100; | |
156 | } | |
157 | } | |
158 | if (end - p >= strlen("version=X\r\n")) { | |
159 | if (strncmp("version=1\r\n", p, strlen("version=1\r\n")) == 0 || | |
160 | strncmp("version=2\r\n", p, strlen("version=2\r\n")) == 0) { | |
161 | return 100; | |
162 | } | |
163 | } | |
164 | return 0; | |
165 | } | |
166 | return 0; | |
167 | } | |
168 | } | |
169 | ||
170 | #define CHECK_CID 1 | |
171 | ||
172 | #define SECTOR_SIZE 512 | |
173 | #define DESC_SIZE (20 * SECTOR_SIZE) /* 20 sectors of 512 bytes each */ | |
174 | #define BUF_SIZE 4096 | |
175 | #define HEADER_SIZE 512 /* first sector of 512 bytes */ | |
176 | ||
177 | static void vmdk_free_extents(BlockDriverState *bs) | |
178 | { | |
179 | int i; | |
180 | BDRVVmdkState *s = bs->opaque; | |
181 | ||
182 | for (i = 0; i < s->num_extents; i++) { | |
183 | g_free(s->extents[i].l1_table); | |
184 | g_free(s->extents[i].l2_cache); | |
185 | g_free(s->extents[i].l1_backup_table); | |
186 | } | |
187 | g_free(s->extents); | |
188 | } | |
189 | ||
190 | static void vmdk_free_last_extent(BlockDriverState *bs) | |
191 | { | |
192 | BDRVVmdkState *s = bs->opaque; | |
193 | ||
194 | if (s->num_extents == 0) { | |
195 | return; | |
196 | } | |
197 | s->num_extents--; | |
198 | s->extents = g_realloc(s->extents, s->num_extents * sizeof(VmdkExtent)); | |
199 | } | |
200 | ||
201 | static uint32_t vmdk_read_cid(BlockDriverState *bs, int parent) | |
202 | { | |
203 | char desc[DESC_SIZE]; | |
204 | uint32_t cid; | |
205 | const char *p_name, *cid_str; | |
206 | size_t cid_str_size; | |
207 | BDRVVmdkState *s = bs->opaque; | |
208 | ||
209 | if (bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE) != DESC_SIZE) { | |
210 | return 0; | |
211 | } | |
212 | ||
213 | if (parent) { | |
214 | cid_str = "parentCID"; | |
215 | cid_str_size = sizeof("parentCID"); | |
216 | } else { | |
217 | cid_str = "CID"; | |
218 | cid_str_size = sizeof("CID"); | |
219 | } | |
220 | ||
221 | p_name = strstr(desc, cid_str); | |
222 | if (p_name != NULL) { | |
223 | p_name += cid_str_size; | |
224 | sscanf(p_name, "%x", &cid); | |
225 | } | |
226 | ||
227 | return cid; | |
228 | } | |
229 | ||
230 | static int vmdk_write_cid(BlockDriverState *bs, uint32_t cid) | |
231 | { | |
232 | char desc[DESC_SIZE], tmp_desc[DESC_SIZE]; | |
233 | char *p_name, *tmp_str; | |
234 | BDRVVmdkState *s = bs->opaque; | |
235 | ||
236 | memset(desc, 0, sizeof(desc)); | |
237 | if (bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE) != DESC_SIZE) { | |
238 | return -EIO; | |
239 | } | |
240 | ||
241 | tmp_str = strstr(desc, "parentCID"); | |
242 | pstrcpy(tmp_desc, sizeof(tmp_desc), tmp_str); | |
243 | p_name = strstr(desc, "CID"); | |
244 | if (p_name != NULL) { | |
245 | p_name += sizeof("CID"); | |
246 | snprintf(p_name, sizeof(desc) - (p_name - desc), "%x\n", cid); | |
247 | pstrcat(desc, sizeof(desc), tmp_desc); | |
248 | } | |
249 | ||
250 | if (bdrv_pwrite_sync(bs->file, s->desc_offset, desc, DESC_SIZE) < 0) { | |
251 | return -EIO; | |
252 | } | |
253 | return 0; | |
254 | } | |
255 | ||
256 | static int vmdk_is_cid_valid(BlockDriverState *bs) | |
257 | { | |
258 | #ifdef CHECK_CID | |
259 | BDRVVmdkState *s = bs->opaque; | |
260 | BlockDriverState *p_bs = bs->backing_hd; | |
261 | uint32_t cur_pcid; | |
262 | ||
263 | if (p_bs) { | |
264 | cur_pcid = vmdk_read_cid(p_bs, 0); | |
265 | if (s->parent_cid != cur_pcid) { | |
266 | /* CID not valid */ | |
267 | return 0; | |
268 | } | |
269 | } | |
270 | #endif | |
271 | /* CID valid */ | |
272 | return 1; | |
273 | } | |
274 | ||
275 | static int vmdk_parent_open(BlockDriverState *bs) | |
276 | { | |
277 | char *p_name; | |
278 | char desc[DESC_SIZE + 1]; | |
279 | BDRVVmdkState *s = bs->opaque; | |
280 | ||
281 | desc[DESC_SIZE] = '\0'; | |
282 | if (bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE) != DESC_SIZE) { | |
283 | return -1; | |
284 | } | |
285 | ||
286 | p_name = strstr(desc, "parentFileNameHint"); | |
287 | if (p_name != NULL) { | |
288 | char *end_name; | |
289 | ||
290 | p_name += sizeof("parentFileNameHint") + 1; | |
291 | end_name = strchr(p_name, '\"'); | |
292 | if (end_name == NULL) { | |
293 | return -1; | |
294 | } | |
295 | if ((end_name - p_name) > sizeof(bs->backing_file) - 1) { | |
296 | return -1; | |
297 | } | |
298 | ||
299 | pstrcpy(bs->backing_file, end_name - p_name + 1, p_name); | |
300 | } | |
301 | ||
302 | return 0; | |
303 | } | |
304 | ||
305 | /* Create and append extent to the extent array. Return the added VmdkExtent | |
306 | * address. return NULL if allocation failed. */ | |
307 | static VmdkExtent *vmdk_add_extent(BlockDriverState *bs, | |
308 | BlockDriverState *file, bool flat, int64_t sectors, | |
309 | int64_t l1_offset, int64_t l1_backup_offset, | |
310 | uint32_t l1_size, | |
311 | int l2_size, unsigned int cluster_sectors) | |
312 | { | |
313 | VmdkExtent *extent; | |
314 | BDRVVmdkState *s = bs->opaque; | |
315 | ||
316 | s->extents = g_realloc(s->extents, | |
317 | (s->num_extents + 1) * sizeof(VmdkExtent)); | |
318 | extent = &s->extents[s->num_extents]; | |
319 | s->num_extents++; | |
320 | ||
321 | memset(extent, 0, sizeof(VmdkExtent)); | |
322 | extent->file = file; | |
323 | extent->flat = flat; | |
324 | extent->sectors = sectors; | |
325 | extent->l1_table_offset = l1_offset; | |
326 | extent->l1_backup_table_offset = l1_backup_offset; | |
327 | extent->l1_size = l1_size; | |
328 | extent->l1_entry_sectors = l2_size * cluster_sectors; | |
329 | extent->l2_size = l2_size; | |
330 | extent->cluster_sectors = cluster_sectors; | |
331 | ||
332 | if (s->num_extents > 1) { | |
333 | extent->end_sector = (*(extent - 1)).end_sector + extent->sectors; | |
334 | } else { | |
335 | extent->end_sector = extent->sectors; | |
336 | } | |
337 | bs->total_sectors = extent->end_sector; | |
338 | return extent; | |
339 | } | |
340 | ||
341 | static int vmdk_init_tables(BlockDriverState *bs, VmdkExtent *extent) | |
342 | { | |
343 | int ret; | |
344 | int l1_size, i; | |
345 | ||
346 | /* read the L1 table */ | |
347 | l1_size = extent->l1_size * sizeof(uint32_t); | |
348 | extent->l1_table = g_malloc(l1_size); | |
349 | ret = bdrv_pread(extent->file, | |
350 | extent->l1_table_offset, | |
351 | extent->l1_table, | |
352 | l1_size); | |
353 | if (ret < 0) { | |
354 | goto fail_l1; | |
355 | } | |
356 | for (i = 0; i < extent->l1_size; i++) { | |
357 | le32_to_cpus(&extent->l1_table[i]); | |
358 | } | |
359 | ||
360 | if (extent->l1_backup_table_offset) { | |
361 | extent->l1_backup_table = g_malloc(l1_size); | |
362 | ret = bdrv_pread(extent->file, | |
363 | extent->l1_backup_table_offset, | |
364 | extent->l1_backup_table, | |
365 | l1_size); | |
366 | if (ret < 0) { | |
367 | goto fail_l1b; | |
368 | } | |
369 | for (i = 0; i < extent->l1_size; i++) { | |
370 | le32_to_cpus(&extent->l1_backup_table[i]); | |
371 | } | |
372 | } | |
373 | ||
374 | extent->l2_cache = | |
375 | g_malloc(extent->l2_size * L2_CACHE_SIZE * sizeof(uint32_t)); | |
376 | return 0; | |
377 | fail_l1b: | |
378 | g_free(extent->l1_backup_table); | |
379 | fail_l1: | |
380 | g_free(extent->l1_table); | |
381 | return ret; | |
382 | } | |
383 | ||
384 | static int vmdk_open_vmdk3(BlockDriverState *bs, | |
385 | BlockDriverState *file, | |
386 | int flags) | |
387 | { | |
388 | int ret; | |
389 | uint32_t magic; | |
390 | VMDK3Header header; | |
391 | VmdkExtent *extent; | |
392 | ||
393 | ret = bdrv_pread(file, sizeof(magic), &header, sizeof(header)); | |
394 | if (ret < 0) { | |
395 | return ret; | |
396 | } | |
397 | extent = vmdk_add_extent(bs, | |
398 | bs->file, false, | |
399 | le32_to_cpu(header.disk_sectors), | |
400 | le32_to_cpu(header.l1dir_offset) << 9, | |
401 | 0, 1 << 6, 1 << 9, | |
402 | le32_to_cpu(header.granularity)); | |
403 | ret = vmdk_init_tables(bs, extent); | |
404 | if (ret) { | |
405 | /* free extent allocated by vmdk_add_extent */ | |
406 | vmdk_free_last_extent(bs); | |
407 | } | |
408 | return ret; | |
409 | } | |
410 | ||
411 | static int vmdk_open_desc_file(BlockDriverState *bs, int flags, | |
412 | int64_t desc_offset); | |
413 | ||
414 | static int vmdk_open_vmdk4(BlockDriverState *bs, | |
415 | BlockDriverState *file, | |
416 | int flags) | |
417 | { | |
418 | int ret; | |
419 | uint32_t magic; | |
420 | uint32_t l1_size, l1_entry_sectors; | |
421 | VMDK4Header header; | |
422 | VmdkExtent *extent; | |
423 | ||
424 | ret = bdrv_pread(file, sizeof(magic), &header, sizeof(header)); | |
425 | if (ret < 0) { | |
426 | return ret; | |
427 | } | |
428 | if (header.capacity == 0 && header.desc_offset) { | |
429 | return vmdk_open_desc_file(bs, flags, header.desc_offset << 9); | |
430 | } | |
431 | l1_entry_sectors = le32_to_cpu(header.num_gtes_per_gte) | |
432 | * le64_to_cpu(header.granularity); | |
433 | if (l1_entry_sectors <= 0) { | |
434 | return -EINVAL; | |
435 | } | |
436 | l1_size = (le64_to_cpu(header.capacity) + l1_entry_sectors - 1) | |
437 | / l1_entry_sectors; | |
438 | extent = vmdk_add_extent(bs, file, false, | |
439 | le64_to_cpu(header.capacity), | |
440 | le64_to_cpu(header.gd_offset) << 9, | |
441 | le64_to_cpu(header.rgd_offset) << 9, | |
442 | l1_size, | |
443 | le32_to_cpu(header.num_gtes_per_gte), | |
444 | le64_to_cpu(header.granularity)); | |
445 | extent->compressed = | |
446 | le16_to_cpu(header.compressAlgorithm) == VMDK4_COMPRESSION_DEFLATE; | |
447 | extent->has_marker = le32_to_cpu(header.flags) & VMDK4_FLAG_MARKER; | |
448 | ret = vmdk_init_tables(bs, extent); | |
449 | if (ret) { | |
450 | /* free extent allocated by vmdk_add_extent */ | |
451 | vmdk_free_last_extent(bs); | |
452 | } | |
453 | return ret; | |
454 | } | |
455 | ||
456 | /* find an option value out of descriptor file */ | |
457 | static int vmdk_parse_description(const char *desc, const char *opt_name, | |
458 | char *buf, int buf_size) | |
459 | { | |
460 | char *opt_pos, *opt_end; | |
461 | const char *end = desc + strlen(desc); | |
462 | ||
463 | opt_pos = strstr(desc, opt_name); | |
464 | if (!opt_pos) { | |
465 | return -1; | |
466 | } | |
467 | /* Skip "=\"" following opt_name */ | |
468 | opt_pos += strlen(opt_name) + 2; | |
469 | if (opt_pos >= end) { | |
470 | return -1; | |
471 | } | |
472 | opt_end = opt_pos; | |
473 | while (opt_end < end && *opt_end != '"') { | |
474 | opt_end++; | |
475 | } | |
476 | if (opt_end == end || buf_size < opt_end - opt_pos + 1) { | |
477 | return -1; | |
478 | } | |
479 | pstrcpy(buf, opt_end - opt_pos + 1, opt_pos); | |
480 | return 0; | |
481 | } | |
482 | ||
483 | /* Open an extent file and append to bs array */ | |
484 | static int vmdk_open_sparse(BlockDriverState *bs, | |
485 | BlockDriverState *file, | |
486 | int flags) | |
487 | { | |
488 | uint32_t magic; | |
489 | ||
490 | if (bdrv_pread(file, 0, &magic, sizeof(magic)) != sizeof(magic)) { | |
491 | return -EIO; | |
492 | } | |
493 | ||
494 | magic = be32_to_cpu(magic); | |
495 | switch (magic) { | |
496 | case VMDK3_MAGIC: | |
497 | return vmdk_open_vmdk3(bs, file, flags); | |
498 | break; | |
499 | case VMDK4_MAGIC: | |
500 | return vmdk_open_vmdk4(bs, file, flags); | |
501 | break; | |
502 | default: | |
503 | return -EINVAL; | |
504 | break; | |
505 | } | |
506 | } | |
507 | ||
508 | static int vmdk_parse_extents(const char *desc, BlockDriverState *bs, | |
509 | const char *desc_file_path) | |
510 | { | |
511 | int ret; | |
512 | char access[11]; | |
513 | char type[11]; | |
514 | char fname[512]; | |
515 | const char *p = desc; | |
516 | int64_t sectors = 0; | |
517 | int64_t flat_offset; | |
518 | char extent_path[PATH_MAX]; | |
519 | BlockDriverState *extent_file; | |
520 | ||
521 | while (*p) { | |
522 | /* parse extent line: | |
523 | * RW [size in sectors] FLAT "file-name.vmdk" OFFSET | |
524 | * or | |
525 | * RW [size in sectors] SPARSE "file-name.vmdk" | |
526 | */ | |
527 | flat_offset = -1; | |
528 | ret = sscanf(p, "%10s %" SCNd64 " %10s %511s %" SCNd64, | |
529 | access, §ors, type, fname, &flat_offset); | |
530 | if (ret < 4 || strcmp(access, "RW")) { | |
531 | goto next_line; | |
532 | } else if (!strcmp(type, "FLAT")) { | |
533 | if (ret != 5 || flat_offset < 0) { | |
534 | return -EINVAL; | |
535 | } | |
536 | } else if (ret != 4) { | |
537 | return -EINVAL; | |
538 | } | |
539 | ||
540 | /* trim the quotation marks around */ | |
541 | if (fname[0] == '"') { | |
542 | memmove(fname, fname + 1, strlen(fname)); | |
543 | if (strlen(fname) <= 1 || fname[strlen(fname) - 1] != '"') { | |
544 | return -EINVAL; | |
545 | } | |
546 | fname[strlen(fname) - 1] = '\0'; | |
547 | } | |
548 | if (sectors <= 0 || | |
549 | (strcmp(type, "FLAT") && strcmp(type, "SPARSE")) || | |
550 | (strcmp(access, "RW"))) { | |
551 | goto next_line; | |
552 | } | |
553 | ||
554 | path_combine(extent_path, sizeof(extent_path), | |
555 | desc_file_path, fname); | |
556 | ret = bdrv_file_open(&extent_file, extent_path, bs->open_flags); | |
557 | if (ret) { | |
558 | return ret; | |
559 | } | |
560 | ||
561 | /* save to extents array */ | |
562 | if (!strcmp(type, "FLAT")) { | |
563 | /* FLAT extent */ | |
564 | VmdkExtent *extent; | |
565 | ||
566 | extent = vmdk_add_extent(bs, extent_file, true, sectors, | |
567 | 0, 0, 0, 0, sectors); | |
568 | extent->flat_start_offset = flat_offset << 9; | |
569 | } else if (!strcmp(type, "SPARSE")) { | |
570 | /* SPARSE extent */ | |
571 | ret = vmdk_open_sparse(bs, extent_file, bs->open_flags); | |
572 | if (ret) { | |
573 | bdrv_delete(extent_file); | |
574 | return ret; | |
575 | } | |
576 | } else { | |
577 | fprintf(stderr, | |
578 | "VMDK: Not supported extent type \"%s\""".\n", type); | |
579 | return -ENOTSUP; | |
580 | } | |
581 | next_line: | |
582 | /* move to next line */ | |
583 | while (*p && *p != '\n') { | |
584 | p++; | |
585 | } | |
586 | p++; | |
587 | } | |
588 | return 0; | |
589 | } | |
590 | ||
591 | static int vmdk_open_desc_file(BlockDriverState *bs, int flags, | |
592 | int64_t desc_offset) | |
593 | { | |
594 | int ret; | |
595 | char buf[2048]; | |
596 | char ct[128]; | |
597 | BDRVVmdkState *s = bs->opaque; | |
598 | ||
599 | ret = bdrv_pread(bs->file, desc_offset, buf, sizeof(buf)); | |
600 | if (ret < 0) { | |
601 | return ret; | |
602 | } | |
603 | buf[2047] = '\0'; | |
604 | if (vmdk_parse_description(buf, "createType", ct, sizeof(ct))) { | |
605 | return -EINVAL; | |
606 | } | |
607 | if (strcmp(ct, "monolithicFlat") && | |
608 | strcmp(ct, "twoGbMaxExtentSparse") && | |
609 | strcmp(ct, "twoGbMaxExtentFlat")) { | |
610 | fprintf(stderr, | |
611 | "VMDK: Not supported image type \"%s\""".\n", ct); | |
612 | return -ENOTSUP; | |
613 | } | |
614 | s->desc_offset = 0; | |
615 | ret = vmdk_parse_extents(buf, bs, bs->file->filename); | |
616 | if (ret) { | |
617 | return ret; | |
618 | } | |
619 | ||
620 | /* try to open parent images, if exist */ | |
621 | if (vmdk_parent_open(bs)) { | |
622 | g_free(s->extents); | |
623 | return -EINVAL; | |
624 | } | |
625 | s->parent_cid = vmdk_read_cid(bs, 1); | |
626 | return 0; | |
627 | } | |
628 | ||
629 | static int vmdk_open(BlockDriverState *bs, int flags) | |
630 | { | |
631 | int ret; | |
632 | BDRVVmdkState *s = bs->opaque; | |
633 | ||
634 | if (vmdk_open_sparse(bs, bs->file, flags) == 0) { | |
635 | s->desc_offset = 0x200; | |
636 | /* try to open parent images, if exist */ | |
637 | ret = vmdk_parent_open(bs); | |
638 | if (ret) { | |
639 | vmdk_free_extents(bs); | |
640 | return ret; | |
641 | } | |
642 | s->parent_cid = vmdk_read_cid(bs, 1); | |
643 | return 0; | |
644 | } else { | |
645 | return vmdk_open_desc_file(bs, flags, 0); | |
646 | } | |
647 | } | |
648 | ||
649 | static int get_whole_cluster(BlockDriverState *bs, | |
650 | VmdkExtent *extent, | |
651 | uint64_t cluster_offset, | |
652 | uint64_t offset, | |
653 | bool allocate) | |
654 | { | |
655 | /* 128 sectors * 512 bytes each = grain size 64KB */ | |
656 | uint8_t whole_grain[extent->cluster_sectors * 512]; | |
657 | ||
658 | /* we will be here if it's first write on non-exist grain(cluster). | |
659 | * try to read from parent image, if exist */ | |
660 | if (bs->backing_hd) { | |
661 | int ret; | |
662 | ||
663 | if (!vmdk_is_cid_valid(bs)) { | |
664 | return -1; | |
665 | } | |
666 | ||
667 | /* floor offset to cluster */ | |
668 | offset -= offset % (extent->cluster_sectors * 512); | |
669 | ret = bdrv_read(bs->backing_hd, offset >> 9, whole_grain, | |
670 | extent->cluster_sectors); | |
671 | if (ret < 0) { | |
672 | return -1; | |
673 | } | |
674 | ||
675 | /* Write grain only into the active image */ | |
676 | ret = bdrv_write(extent->file, cluster_offset, whole_grain, | |
677 | extent->cluster_sectors); | |
678 | if (ret < 0) { | |
679 | return -1; | |
680 | } | |
681 | } | |
682 | return 0; | |
683 | } | |
684 | ||
685 | static int vmdk_L2update(VmdkExtent *extent, VmdkMetaData *m_data) | |
686 | { | |
687 | /* update L2 table */ | |
688 | if (bdrv_pwrite_sync( | |
689 | extent->file, | |
690 | ((int64_t)m_data->l2_offset * 512) | |
691 | + (m_data->l2_index * sizeof(m_data->offset)), | |
692 | &(m_data->offset), | |
693 | sizeof(m_data->offset) | |
694 | ) < 0) { | |
695 | return -1; | |
696 | } | |
697 | /* update backup L2 table */ | |
698 | if (extent->l1_backup_table_offset != 0) { | |
699 | m_data->l2_offset = extent->l1_backup_table[m_data->l1_index]; | |
700 | if (bdrv_pwrite_sync( | |
701 | extent->file, | |
702 | ((int64_t)m_data->l2_offset * 512) | |
703 | + (m_data->l2_index * sizeof(m_data->offset)), | |
704 | &(m_data->offset), sizeof(m_data->offset) | |
705 | ) < 0) { | |
706 | return -1; | |
707 | } | |
708 | } | |
709 | ||
710 | return 0; | |
711 | } | |
712 | ||
713 | static int get_cluster_offset(BlockDriverState *bs, | |
714 | VmdkExtent *extent, | |
715 | VmdkMetaData *m_data, | |
716 | uint64_t offset, | |
717 | int allocate, | |
718 | uint64_t *cluster_offset) | |
719 | { | |
720 | unsigned int l1_index, l2_offset, l2_index; | |
721 | int min_index, i, j; | |
722 | uint32_t min_count, *l2_table, tmp = 0; | |
723 | ||
724 | if (m_data) { | |
725 | m_data->valid = 0; | |
726 | } | |
727 | if (extent->flat) { | |
728 | *cluster_offset = extent->flat_start_offset; | |
729 | return 0; | |
730 | } | |
731 | ||
732 | offset -= (extent->end_sector - extent->sectors) * SECTOR_SIZE; | |
733 | l1_index = (offset >> 9) / extent->l1_entry_sectors; | |
734 | if (l1_index >= extent->l1_size) { | |
735 | return -1; | |
736 | } | |
737 | l2_offset = extent->l1_table[l1_index]; | |
738 | if (!l2_offset) { | |
739 | return -1; | |
740 | } | |
741 | for (i = 0; i < L2_CACHE_SIZE; i++) { | |
742 | if (l2_offset == extent->l2_cache_offsets[i]) { | |
743 | /* increment the hit count */ | |
744 | if (++extent->l2_cache_counts[i] == 0xffffffff) { | |
745 | for (j = 0; j < L2_CACHE_SIZE; j++) { | |
746 | extent->l2_cache_counts[j] >>= 1; | |
747 | } | |
748 | } | |
749 | l2_table = extent->l2_cache + (i * extent->l2_size); | |
750 | goto found; | |
751 | } | |
752 | } | |
753 | /* not found: load a new entry in the least used one */ | |
754 | min_index = 0; | |
755 | min_count = 0xffffffff; | |
756 | for (i = 0; i < L2_CACHE_SIZE; i++) { | |
757 | if (extent->l2_cache_counts[i] < min_count) { | |
758 | min_count = extent->l2_cache_counts[i]; | |
759 | min_index = i; | |
760 | } | |
761 | } | |
762 | l2_table = extent->l2_cache + (min_index * extent->l2_size); | |
763 | if (bdrv_pread( | |
764 | extent->file, | |
765 | (int64_t)l2_offset * 512, | |
766 | l2_table, | |
767 | extent->l2_size * sizeof(uint32_t) | |
768 | ) != extent->l2_size * sizeof(uint32_t)) { | |
769 | return -1; | |
770 | } | |
771 | ||
772 | extent->l2_cache_offsets[min_index] = l2_offset; | |
773 | extent->l2_cache_counts[min_index] = 1; | |
774 | found: | |
775 | l2_index = ((offset >> 9) / extent->cluster_sectors) % extent->l2_size; | |
776 | *cluster_offset = le32_to_cpu(l2_table[l2_index]); | |
777 | ||
778 | if (!*cluster_offset) { | |
779 | if (!allocate) { | |
780 | return -1; | |
781 | } | |
782 | ||
783 | /* Avoid the L2 tables update for the images that have snapshots. */ | |
784 | *cluster_offset = bdrv_getlength(extent->file); | |
785 | if (!extent->compressed) { | |
786 | bdrv_truncate( | |
787 | extent->file, | |
788 | *cluster_offset + (extent->cluster_sectors << 9) | |
789 | ); | |
790 | } | |
791 | ||
792 | *cluster_offset >>= 9; | |
793 | tmp = cpu_to_le32(*cluster_offset); | |
794 | l2_table[l2_index] = tmp; | |
795 | ||
796 | /* First of all we write grain itself, to avoid race condition | |
797 | * that may to corrupt the image. | |
798 | * This problem may occur because of insufficient space on host disk | |
799 | * or inappropriate VM shutdown. | |
800 | */ | |
801 | if (get_whole_cluster( | |
802 | bs, extent, *cluster_offset, offset, allocate) == -1) { | |
803 | return -1; | |
804 | } | |
805 | ||
806 | if (m_data) { | |
807 | m_data->offset = tmp; | |
808 | m_data->l1_index = l1_index; | |
809 | m_data->l2_index = l2_index; | |
810 | m_data->l2_offset = l2_offset; | |
811 | m_data->valid = 1; | |
812 | } | |
813 | } | |
814 | *cluster_offset <<= 9; | |
815 | return 0; | |
816 | } | |
817 | ||
818 | static VmdkExtent *find_extent(BDRVVmdkState *s, | |
819 | int64_t sector_num, VmdkExtent *start_hint) | |
820 | { | |
821 | VmdkExtent *extent = start_hint; | |
822 | ||
823 | if (!extent) { | |
824 | extent = &s->extents[0]; | |
825 | } | |
826 | while (extent < &s->extents[s->num_extents]) { | |
827 | if (sector_num < extent->end_sector) { | |
828 | return extent; | |
829 | } | |
830 | extent++; | |
831 | } | |
832 | return NULL; | |
833 | } | |
834 | ||
835 | static int vmdk_is_allocated(BlockDriverState *bs, int64_t sector_num, | |
836 | int nb_sectors, int *pnum) | |
837 | { | |
838 | BDRVVmdkState *s = bs->opaque; | |
839 | int64_t index_in_cluster, n, ret; | |
840 | uint64_t offset; | |
841 | VmdkExtent *extent; | |
842 | ||
843 | extent = find_extent(s, sector_num, NULL); | |
844 | if (!extent) { | |
845 | return 0; | |
846 | } | |
847 | ret = get_cluster_offset(bs, extent, NULL, | |
848 | sector_num * 512, 0, &offset); | |
849 | /* get_cluster_offset returning 0 means success */ | |
850 | ret = !ret; | |
851 | ||
852 | index_in_cluster = sector_num % extent->cluster_sectors; | |
853 | n = extent->cluster_sectors - index_in_cluster; | |
854 | if (n > nb_sectors) { | |
855 | n = nb_sectors; | |
856 | } | |
857 | *pnum = n; | |
858 | return ret; | |
859 | } | |
860 | ||
861 | static int vmdk_write_extent(VmdkExtent *extent, int64_t cluster_offset, | |
862 | int64_t offset_in_cluster, const uint8_t *buf, | |
863 | int nb_sectors, int64_t sector_num) | |
864 | { | |
865 | int ret; | |
866 | VmdkGrainMarker *data = NULL; | |
867 | uLongf buf_len; | |
868 | const uint8_t *write_buf = buf; | |
869 | int write_len = nb_sectors * 512; | |
870 | ||
871 | if (extent->compressed) { | |
872 | if (!extent->has_marker) { | |
873 | ret = -EINVAL; | |
874 | goto out; | |
875 | } | |
876 | buf_len = (extent->cluster_sectors << 9) * 2; | |
877 | data = g_malloc(buf_len + sizeof(VmdkGrainMarker)); | |
878 | if (compress(data->data, &buf_len, buf, nb_sectors << 9) != Z_OK || | |
879 | buf_len == 0) { | |
880 | ret = -EINVAL; | |
881 | goto out; | |
882 | } | |
883 | data->lba = sector_num; | |
884 | data->size = buf_len; | |
885 | write_buf = (uint8_t *)data; | |
886 | write_len = buf_len + sizeof(VmdkGrainMarker); | |
887 | } | |
888 | ret = bdrv_pwrite(extent->file, | |
889 | cluster_offset + offset_in_cluster, | |
890 | write_buf, | |
891 | write_len); | |
892 | if (ret != write_len) { | |
893 | ret = ret < 0 ? ret : -EIO; | |
894 | goto out; | |
895 | } | |
896 | ret = 0; | |
897 | out: | |
898 | g_free(data); | |
899 | return ret; | |
900 | } | |
901 | ||
902 | static int vmdk_read_extent(VmdkExtent *extent, int64_t cluster_offset, | |
903 | int64_t offset_in_cluster, uint8_t *buf, | |
904 | int nb_sectors) | |
905 | { | |
906 | int ret; | |
907 | int cluster_bytes, buf_bytes; | |
908 | uint8_t *cluster_buf, *compressed_data; | |
909 | uint8_t *uncomp_buf; | |
910 | uint32_t data_len; | |
911 | VmdkGrainMarker *marker; | |
912 | uLongf buf_len; | |
913 | ||
914 | ||
915 | if (!extent->compressed) { | |
916 | ret = bdrv_pread(extent->file, | |
917 | cluster_offset + offset_in_cluster, | |
918 | buf, nb_sectors * 512); | |
919 | if (ret == nb_sectors * 512) { | |
920 | return 0; | |
921 | } else { | |
922 | return -EIO; | |
923 | } | |
924 | } | |
925 | cluster_bytes = extent->cluster_sectors * 512; | |
926 | /* Read two clusters in case GrainMarker + compressed data > one cluster */ | |
927 | buf_bytes = cluster_bytes * 2; | |
928 | cluster_buf = g_malloc(buf_bytes); | |
929 | uncomp_buf = g_malloc(cluster_bytes); | |
930 | ret = bdrv_pread(extent->file, | |
931 | cluster_offset, | |
932 | cluster_buf, buf_bytes); | |
933 | if (ret < 0) { | |
934 | goto out; | |
935 | } | |
936 | compressed_data = cluster_buf; | |
937 | buf_len = cluster_bytes; | |
938 | data_len = cluster_bytes; | |
939 | if (extent->has_marker) { | |
940 | marker = (VmdkGrainMarker *)cluster_buf; | |
941 | compressed_data = marker->data; | |
942 | data_len = le32_to_cpu(marker->size); | |
943 | } | |
944 | if (!data_len || data_len > buf_bytes) { | |
945 | ret = -EINVAL; | |
946 | goto out; | |
947 | } | |
948 | ret = uncompress(uncomp_buf, &buf_len, compressed_data, data_len); | |
949 | if (ret != Z_OK) { | |
950 | ret = -EINVAL; | |
951 | goto out; | |
952 | ||
953 | } | |
954 | if (offset_in_cluster < 0 || | |
955 | offset_in_cluster + nb_sectors * 512 > buf_len) { | |
956 | ret = -EINVAL; | |
957 | goto out; | |
958 | } | |
959 | memcpy(buf, uncomp_buf + offset_in_cluster, nb_sectors * 512); | |
960 | ret = 0; | |
961 | ||
962 | out: | |
963 | g_free(uncomp_buf); | |
964 | g_free(cluster_buf); | |
965 | return ret; | |
966 | } | |
967 | ||
968 | static int vmdk_read(BlockDriverState *bs, int64_t sector_num, | |
969 | uint8_t *buf, int nb_sectors) | |
970 | { | |
971 | BDRVVmdkState *s = bs->opaque; | |
972 | int ret; | |
973 | uint64_t n, index_in_cluster; | |
974 | VmdkExtent *extent = NULL; | |
975 | uint64_t cluster_offset; | |
976 | ||
977 | while (nb_sectors > 0) { | |
978 | extent = find_extent(s, sector_num, extent); | |
979 | if (!extent) { | |
980 | return -EIO; | |
981 | } | |
982 | ret = get_cluster_offset( | |
983 | bs, extent, NULL, | |
984 | sector_num << 9, 0, &cluster_offset); | |
985 | index_in_cluster = sector_num % extent->cluster_sectors; | |
986 | n = extent->cluster_sectors - index_in_cluster; | |
987 | if (n > nb_sectors) { | |
988 | n = nb_sectors; | |
989 | } | |
990 | if (ret) { | |
991 | /* if not allocated, try to read from parent image, if exist */ | |
992 | if (bs->backing_hd) { | |
993 | if (!vmdk_is_cid_valid(bs)) { | |
994 | return -EINVAL; | |
995 | } | |
996 | ret = bdrv_read(bs->backing_hd, sector_num, buf, n); | |
997 | if (ret < 0) { | |
998 | return ret; | |
999 | } | |
1000 | } else { | |
1001 | memset(buf, 0, 512 * n); | |
1002 | } | |
1003 | } else { | |
1004 | ret = vmdk_read_extent(extent, | |
1005 | cluster_offset, index_in_cluster * 512, | |
1006 | buf, n); | |
1007 | if (ret) { | |
1008 | return ret; | |
1009 | } | |
1010 | } | |
1011 | nb_sectors -= n; | |
1012 | sector_num += n; | |
1013 | buf += n * 512; | |
1014 | } | |
1015 | return 0; | |
1016 | } | |
1017 | ||
1018 | static int vmdk_write(BlockDriverState *bs, int64_t sector_num, | |
1019 | const uint8_t *buf, int nb_sectors) | |
1020 | { | |
1021 | BDRVVmdkState *s = bs->opaque; | |
1022 | VmdkExtent *extent = NULL; | |
1023 | int n, ret; | |
1024 | int64_t index_in_cluster; | |
1025 | uint64_t cluster_offset; | |
1026 | VmdkMetaData m_data; | |
1027 | ||
1028 | if (sector_num > bs->total_sectors) { | |
1029 | fprintf(stderr, | |
1030 | "(VMDK) Wrong offset: sector_num=0x%" PRIx64 | |
1031 | " total_sectors=0x%" PRIx64 "\n", | |
1032 | sector_num, bs->total_sectors); | |
1033 | return -EIO; | |
1034 | } | |
1035 | ||
1036 | while (nb_sectors > 0) { | |
1037 | extent = find_extent(s, sector_num, extent); | |
1038 | if (!extent) { | |
1039 | return -EIO; | |
1040 | } | |
1041 | ret = get_cluster_offset( | |
1042 | bs, | |
1043 | extent, | |
1044 | &m_data, | |
1045 | sector_num << 9, !extent->compressed, | |
1046 | &cluster_offset); | |
1047 | if (extent->compressed) { | |
1048 | if (ret == 0) { | |
1049 | /* Refuse write to allocated cluster for streamOptimized */ | |
1050 | fprintf(stderr, | |
1051 | "VMDK: can't write to allocated cluster" | |
1052 | " for streamOptimized\n"); | |
1053 | return -EIO; | |
1054 | } else { | |
1055 | /* allocate */ | |
1056 | ret = get_cluster_offset( | |
1057 | bs, | |
1058 | extent, | |
1059 | &m_data, | |
1060 | sector_num << 9, 1, | |
1061 | &cluster_offset); | |
1062 | } | |
1063 | } | |
1064 | if (ret) { | |
1065 | return -EINVAL; | |
1066 | } | |
1067 | index_in_cluster = sector_num % extent->cluster_sectors; | |
1068 | n = extent->cluster_sectors - index_in_cluster; | |
1069 | if (n > nb_sectors) { | |
1070 | n = nb_sectors; | |
1071 | } | |
1072 | ||
1073 | ret = vmdk_write_extent(extent, | |
1074 | cluster_offset, index_in_cluster * 512, | |
1075 | buf, n, sector_num); | |
1076 | if (ret) { | |
1077 | return ret; | |
1078 | } | |
1079 | if (m_data.valid) { | |
1080 | /* update L2 tables */ | |
1081 | if (vmdk_L2update(extent, &m_data) == -1) { | |
1082 | return -EIO; | |
1083 | } | |
1084 | } | |
1085 | nb_sectors -= n; | |
1086 | sector_num += n; | |
1087 | buf += n * 512; | |
1088 | ||
1089 | /* update CID on the first write every time the virtual disk is | |
1090 | * opened */ | |
1091 | if (!s->cid_updated) { | |
1092 | vmdk_write_cid(bs, time(NULL)); | |
1093 | s->cid_updated = true; | |
1094 | } | |
1095 | } | |
1096 | return 0; | |
1097 | } | |
1098 | ||
1099 | ||
1100 | static int vmdk_create_extent(const char *filename, int64_t filesize, | |
1101 | bool flat, bool compress) | |
1102 | { | |
1103 | int ret, i; | |
1104 | int fd = 0; | |
1105 | VMDK4Header header; | |
1106 | uint32_t tmp, magic, grains, gd_size, gt_size, gt_count; | |
1107 | ||
1108 | fd = open( | |
1109 | filename, | |
1110 | O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, | |
1111 | 0644); | |
1112 | if (fd < 0) { | |
1113 | return -errno; | |
1114 | } | |
1115 | if (flat) { | |
1116 | ret = ftruncate(fd, filesize); | |
1117 | if (ret < 0) { | |
1118 | ret = -errno; | |
1119 | } | |
1120 | goto exit; | |
1121 | } | |
1122 | magic = cpu_to_be32(VMDK4_MAGIC); | |
1123 | memset(&header, 0, sizeof(header)); | |
1124 | header.version = 1; | |
1125 | header.flags = | |
1126 | 3 | (compress ? VMDK4_FLAG_COMPRESS | VMDK4_FLAG_MARKER : 0); | |
1127 | header.compressAlgorithm = compress ? VMDK4_COMPRESSION_DEFLATE : 0; | |
1128 | header.capacity = filesize / 512; | |
1129 | header.granularity = 128; | |
1130 | header.num_gtes_per_gte = 512; | |
1131 | ||
1132 | grains = (filesize / 512 + header.granularity - 1) / header.granularity; | |
1133 | gt_size = ((header.num_gtes_per_gte * sizeof(uint32_t)) + 511) >> 9; | |
1134 | gt_count = | |
1135 | (grains + header.num_gtes_per_gte - 1) / header.num_gtes_per_gte; | |
1136 | gd_size = (gt_count * sizeof(uint32_t) + 511) >> 9; | |
1137 | ||
1138 | header.desc_offset = 1; | |
1139 | header.desc_size = 20; | |
1140 | header.rgd_offset = header.desc_offset + header.desc_size; | |
1141 | header.gd_offset = header.rgd_offset + gd_size + (gt_size * gt_count); | |
1142 | header.grain_offset = | |
1143 | ((header.gd_offset + gd_size + (gt_size * gt_count) + | |
1144 | header.granularity - 1) / header.granularity) * | |
1145 | header.granularity; | |
1146 | /* swap endianness for all header fields */ | |
1147 | header.version = cpu_to_le32(header.version); | |
1148 | header.flags = cpu_to_le32(header.flags); | |
1149 | header.capacity = cpu_to_le64(header.capacity); | |
1150 | header.granularity = cpu_to_le64(header.granularity); | |
1151 | header.num_gtes_per_gte = cpu_to_le32(header.num_gtes_per_gte); | |
1152 | header.desc_offset = cpu_to_le64(header.desc_offset); | |
1153 | header.desc_size = cpu_to_le64(header.desc_size); | |
1154 | header.rgd_offset = cpu_to_le64(header.rgd_offset); | |
1155 | header.gd_offset = cpu_to_le64(header.gd_offset); | |
1156 | header.grain_offset = cpu_to_le64(header.grain_offset); | |
1157 | header.compressAlgorithm = cpu_to_le16(header.compressAlgorithm); | |
1158 | ||
1159 | header.check_bytes[0] = 0xa; | |
1160 | header.check_bytes[1] = 0x20; | |
1161 | header.check_bytes[2] = 0xd; | |
1162 | header.check_bytes[3] = 0xa; | |
1163 | ||
1164 | /* write all the data */ | |
1165 | ret = qemu_write_full(fd, &magic, sizeof(magic)); | |
1166 | if (ret != sizeof(magic)) { | |
1167 | ret = -errno; | |
1168 | goto exit; | |
1169 | } | |
1170 | ret = qemu_write_full(fd, &header, sizeof(header)); | |
1171 | if (ret != sizeof(header)) { | |
1172 | ret = -errno; | |
1173 | goto exit; | |
1174 | } | |
1175 | ||
1176 | ret = ftruncate(fd, le64_to_cpu(header.grain_offset) << 9); | |
1177 | if (ret < 0) { | |
1178 | ret = -errno; | |
1179 | goto exit; | |
1180 | } | |
1181 | ||
1182 | /* write grain directory */ | |
1183 | lseek(fd, le64_to_cpu(header.rgd_offset) << 9, SEEK_SET); | |
1184 | for (i = 0, tmp = le64_to_cpu(header.rgd_offset) + gd_size; | |
1185 | i < gt_count; i++, tmp += gt_size) { | |
1186 | ret = qemu_write_full(fd, &tmp, sizeof(tmp)); | |
1187 | if (ret != sizeof(tmp)) { | |
1188 | ret = -errno; | |
1189 | goto exit; | |
1190 | } | |
1191 | } | |
1192 | ||
1193 | /* write backup grain directory */ | |
1194 | lseek(fd, le64_to_cpu(header.gd_offset) << 9, SEEK_SET); | |
1195 | for (i = 0, tmp = le64_to_cpu(header.gd_offset) + gd_size; | |
1196 | i < gt_count; i++, tmp += gt_size) { | |
1197 | ret = qemu_write_full(fd, &tmp, sizeof(tmp)); | |
1198 | if (ret != sizeof(tmp)) { | |
1199 | ret = -errno; | |
1200 | goto exit; | |
1201 | } | |
1202 | } | |
1203 | ||
1204 | ret = 0; | |
1205 | exit: | |
1206 | close(fd); | |
1207 | return ret; | |
1208 | } | |
1209 | ||
1210 | static int filename_decompose(const char *filename, char *path, char *prefix, | |
1211 | char *postfix, size_t buf_len) | |
1212 | { | |
1213 | const char *p, *q; | |
1214 | ||
1215 | if (filename == NULL || !strlen(filename)) { | |
1216 | fprintf(stderr, "Vmdk: no filename provided.\n"); | |
1217 | return -1; | |
1218 | } | |
1219 | p = strrchr(filename, '/'); | |
1220 | if (p == NULL) { | |
1221 | p = strrchr(filename, '\\'); | |
1222 | } | |
1223 | if (p == NULL) { | |
1224 | p = strrchr(filename, ':'); | |
1225 | } | |
1226 | if (p != NULL) { | |
1227 | p++; | |
1228 | if (p - filename >= buf_len) { | |
1229 | return -1; | |
1230 | } | |
1231 | pstrcpy(path, p - filename + 1, filename); | |
1232 | } else { | |
1233 | p = filename; | |
1234 | path[0] = '\0'; | |
1235 | } | |
1236 | q = strrchr(p, '.'); | |
1237 | if (q == NULL) { | |
1238 | pstrcpy(prefix, buf_len, p); | |
1239 | postfix[0] = '\0'; | |
1240 | } else { | |
1241 | if (q - p >= buf_len) { | |
1242 | return -1; | |
1243 | } | |
1244 | pstrcpy(prefix, q - p + 1, p); | |
1245 | pstrcpy(postfix, buf_len, q); | |
1246 | } | |
1247 | return 0; | |
1248 | } | |
1249 | ||
1250 | static int relative_path(char *dest, int dest_size, | |
1251 | const char *base, const char *target) | |
1252 | { | |
1253 | int i = 0; | |
1254 | int n = 0; | |
1255 | const char *p, *q; | |
1256 | #ifdef _WIN32 | |
1257 | const char *sep = "\\"; | |
1258 | #else | |
1259 | const char *sep = "/"; | |
1260 | #endif | |
1261 | ||
1262 | if (!(dest && base && target)) { | |
1263 | return -1; | |
1264 | } | |
1265 | if (path_is_absolute(target)) { | |
1266 | dest[dest_size - 1] = '\0'; | |
1267 | strncpy(dest, target, dest_size - 1); | |
1268 | return 0; | |
1269 | } | |
1270 | while (base[i] == target[i]) { | |
1271 | i++; | |
1272 | } | |
1273 | p = &base[i]; | |
1274 | q = &target[i]; | |
1275 | while (*p) { | |
1276 | if (*p == *sep) { | |
1277 | n++; | |
1278 | } | |
1279 | p++; | |
1280 | } | |
1281 | dest[0] = '\0'; | |
1282 | for (; n; n--) { | |
1283 | pstrcat(dest, dest_size, ".."); | |
1284 | pstrcat(dest, dest_size, sep); | |
1285 | } | |
1286 | pstrcat(dest, dest_size, q); | |
1287 | return 0; | |
1288 | } | |
1289 | ||
1290 | static int vmdk_create(const char *filename, QEMUOptionParameter *options) | |
1291 | { | |
1292 | int fd, idx = 0; | |
1293 | char desc[BUF_SIZE]; | |
1294 | int64_t total_size = 0, filesize; | |
1295 | const char *backing_file = NULL; | |
1296 | const char *fmt = NULL; | |
1297 | int flags = 0; | |
1298 | int ret = 0; | |
1299 | bool flat, split, compress; | |
1300 | char ext_desc_lines[BUF_SIZE] = ""; | |
1301 | char path[PATH_MAX], prefix[PATH_MAX], postfix[PATH_MAX]; | |
1302 | const int64_t split_size = 0x80000000; /* VMDK has constant split size */ | |
1303 | const char *desc_extent_line; | |
1304 | char parent_desc_line[BUF_SIZE] = ""; | |
1305 | uint32_t parent_cid = 0xffffffff; | |
1306 | const char desc_template[] = | |
1307 | "# Disk DescriptorFile\n" | |
1308 | "version=1\n" | |
1309 | "CID=%x\n" | |
1310 | "parentCID=%x\n" | |
1311 | "createType=\"%s\"\n" | |
1312 | "%s" | |
1313 | "\n" | |
1314 | "# Extent description\n" | |
1315 | "%s" | |
1316 | "\n" | |
1317 | "# The Disk Data Base\n" | |
1318 | "#DDB\n" | |
1319 | "\n" | |
1320 | "ddb.virtualHWVersion = \"%d\"\n" | |
1321 | "ddb.geometry.cylinders = \"%" PRId64 "\"\n" | |
1322 | "ddb.geometry.heads = \"16\"\n" | |
1323 | "ddb.geometry.sectors = \"63\"\n" | |
1324 | "ddb.adapterType = \"ide\"\n"; | |
1325 | ||
1326 | if (filename_decompose(filename, path, prefix, postfix, PATH_MAX)) { | |
1327 | return -EINVAL; | |
1328 | } | |
1329 | /* Read out options */ | |
1330 | while (options && options->name) { | |
1331 | if (!strcmp(options->name, BLOCK_OPT_SIZE)) { | |
1332 | total_size = options->value.n; | |
1333 | } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) { | |
1334 | backing_file = options->value.s; | |
1335 | } else if (!strcmp(options->name, BLOCK_OPT_COMPAT6)) { | |
1336 | flags |= options->value.n ? BLOCK_FLAG_COMPAT6 : 0; | |
1337 | } else if (!strcmp(options->name, BLOCK_OPT_SUBFMT)) { | |
1338 | fmt = options->value.s; | |
1339 | } | |
1340 | options++; | |
1341 | } | |
1342 | if (!fmt) { | |
1343 | /* Default format to monolithicSparse */ | |
1344 | fmt = "monolithicSparse"; | |
1345 | } else if (strcmp(fmt, "monolithicFlat") && | |
1346 | strcmp(fmt, "monolithicSparse") && | |
1347 | strcmp(fmt, "twoGbMaxExtentSparse") && | |
1348 | strcmp(fmt, "twoGbMaxExtentFlat") && | |
1349 | strcmp(fmt, "streamOptimized")) { | |
1350 | fprintf(stderr, "VMDK: Unknown subformat: %s\n", fmt); | |
1351 | return -EINVAL; | |
1352 | } | |
1353 | split = !(strcmp(fmt, "twoGbMaxExtentFlat") && | |
1354 | strcmp(fmt, "twoGbMaxExtentSparse")); | |
1355 | flat = !(strcmp(fmt, "monolithicFlat") && | |
1356 | strcmp(fmt, "twoGbMaxExtentFlat")); | |
1357 | compress = !strcmp(fmt, "streamOptimized"); | |
1358 | if (flat) { | |
1359 | desc_extent_line = "RW %lld FLAT \"%s\" 0\n"; | |
1360 | } else { | |
1361 | desc_extent_line = "RW %lld SPARSE \"%s\"\n"; | |
1362 | } | |
1363 | if (flat && backing_file) { | |
1364 | /* not supporting backing file for flat image */ | |
1365 | return -ENOTSUP; | |
1366 | } | |
1367 | if (backing_file) { | |
1368 | char parent_filename[PATH_MAX]; | |
1369 | BlockDriverState *bs = bdrv_new(""); | |
1370 | ret = bdrv_open(bs, backing_file, 0, NULL); | |
1371 | if (ret != 0) { | |
1372 | bdrv_delete(bs); | |
1373 | return ret; | |
1374 | } | |
1375 | if (strcmp(bs->drv->format_name, "vmdk")) { | |
1376 | bdrv_delete(bs); | |
1377 | return -EINVAL; | |
1378 | } | |
1379 | filesize = bdrv_getlength(bs); | |
1380 | parent_cid = vmdk_read_cid(bs, 0); | |
1381 | bdrv_delete(bs); | |
1382 | relative_path(parent_filename, sizeof(parent_filename), | |
1383 | filename, backing_file); | |
1384 | snprintf(parent_desc_line, sizeof(parent_desc_line), | |
1385 | "parentFileNameHint=\"%s\"", parent_filename); | |
1386 | } | |
1387 | ||
1388 | /* Create extents */ | |
1389 | filesize = total_size; | |
1390 | while (filesize > 0) { | |
1391 | char desc_line[BUF_SIZE]; | |
1392 | char ext_filename[PATH_MAX]; | |
1393 | char desc_filename[PATH_MAX]; | |
1394 | int64_t size = filesize; | |
1395 | ||
1396 | if (split && size > split_size) { | |
1397 | size = split_size; | |
1398 | } | |
1399 | if (split) { | |
1400 | snprintf(desc_filename, sizeof(desc_filename), "%s-%c%03d%s", | |
1401 | prefix, flat ? 'f' : 's', ++idx, postfix); | |
1402 | } else if (flat) { | |
1403 | snprintf(desc_filename, sizeof(desc_filename), "%s-flat%s", | |
1404 | prefix, postfix); | |
1405 | } else { | |
1406 | snprintf(desc_filename, sizeof(desc_filename), "%s%s", | |
1407 | prefix, postfix); | |
1408 | } | |
1409 | snprintf(ext_filename, sizeof(ext_filename), "%s%s", | |
1410 | path, desc_filename); | |
1411 | ||
1412 | if (vmdk_create_extent(ext_filename, size, flat, compress)) { | |
1413 | return -EINVAL; | |
1414 | } | |
1415 | filesize -= size; | |
1416 | ||
1417 | /* Format description line */ | |
1418 | snprintf(desc_line, sizeof(desc_line), | |
1419 | desc_extent_line, size / 512, desc_filename); | |
1420 | pstrcat(ext_desc_lines, sizeof(ext_desc_lines), desc_line); | |
1421 | } | |
1422 | /* generate descriptor file */ | |
1423 | snprintf(desc, sizeof(desc), desc_template, | |
1424 | (unsigned int)time(NULL), | |
1425 | parent_cid, | |
1426 | fmt, | |
1427 | parent_desc_line, | |
1428 | ext_desc_lines, | |
1429 | (flags & BLOCK_FLAG_COMPAT6 ? 6 : 4), | |
1430 | total_size / (int64_t)(63 * 16 * 512)); | |
1431 | if (split || flat) { | |
1432 | fd = open( | |
1433 | filename, | |
1434 | O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, | |
1435 | 0644); | |
1436 | } else { | |
1437 | fd = open( | |
1438 | filename, | |
1439 | O_WRONLY | O_BINARY | O_LARGEFILE, | |
1440 | 0644); | |
1441 | } | |
1442 | if (fd < 0) { | |
1443 | return -errno; | |
1444 | } | |
1445 | /* the descriptor offset = 0x200 */ | |
1446 | if (!split && !flat && 0x200 != lseek(fd, 0x200, SEEK_SET)) { | |
1447 | ret = -errno; | |
1448 | goto exit; | |
1449 | } | |
1450 | ret = qemu_write_full(fd, desc, strlen(desc)); | |
1451 | if (ret != strlen(desc)) { | |
1452 | ret = -errno; | |
1453 | goto exit; | |
1454 | } | |
1455 | ret = 0; | |
1456 | exit: | |
1457 | close(fd); | |
1458 | return ret; | |
1459 | } | |
1460 | ||
1461 | static void vmdk_close(BlockDriverState *bs) | |
1462 | { | |
1463 | vmdk_free_extents(bs); | |
1464 | } | |
1465 | ||
1466 | static int vmdk_flush(BlockDriverState *bs) | |
1467 | { | |
1468 | int i, ret, err; | |
1469 | BDRVVmdkState *s = bs->opaque; | |
1470 | ||
1471 | ret = bdrv_flush(bs->file); | |
1472 | for (i = 0; i < s->num_extents; i++) { | |
1473 | err = bdrv_flush(s->extents[i].file); | |
1474 | if (err < 0) { | |
1475 | ret = err; | |
1476 | } | |
1477 | } | |
1478 | return ret; | |
1479 | } | |
1480 | ||
1481 | static int64_t vmdk_get_allocated_file_size(BlockDriverState *bs) | |
1482 | { | |
1483 | int i; | |
1484 | int64_t ret = 0; | |
1485 | int64_t r; | |
1486 | BDRVVmdkState *s = bs->opaque; | |
1487 | ||
1488 | ret = bdrv_get_allocated_file_size(bs->file); | |
1489 | if (ret < 0) { | |
1490 | return ret; | |
1491 | } | |
1492 | for (i = 0; i < s->num_extents; i++) { | |
1493 | if (s->extents[i].file == bs->file) { | |
1494 | continue; | |
1495 | } | |
1496 | r = bdrv_get_allocated_file_size(s->extents[i].file); | |
1497 | if (r < 0) { | |
1498 | return r; | |
1499 | } | |
1500 | ret += r; | |
1501 | } | |
1502 | return ret; | |
1503 | } | |
1504 | ||
1505 | static QEMUOptionParameter vmdk_create_options[] = { | |
1506 | { | |
1507 | .name = BLOCK_OPT_SIZE, | |
1508 | .type = OPT_SIZE, | |
1509 | .help = "Virtual disk size" | |
1510 | }, | |
1511 | { | |
1512 | .name = BLOCK_OPT_BACKING_FILE, | |
1513 | .type = OPT_STRING, | |
1514 | .help = "File name of a base image" | |
1515 | }, | |
1516 | { | |
1517 | .name = BLOCK_OPT_COMPAT6, | |
1518 | .type = OPT_FLAG, | |
1519 | .help = "VMDK version 6 image" | |
1520 | }, | |
1521 | { | |
1522 | .name = BLOCK_OPT_SUBFMT, | |
1523 | .type = OPT_STRING, | |
1524 | .help = | |
1525 | "VMDK flat extent format, can be one of " | |
1526 | "{monolithicSparse (default) | monolithicFlat | twoGbMaxExtentSparse | twoGbMaxExtentFlat | streamOptimized} " | |
1527 | }, | |
1528 | { NULL } | |
1529 | }; | |
1530 | ||
1531 | static BlockDriver bdrv_vmdk = { | |
1532 | .format_name = "vmdk", | |
1533 | .instance_size = sizeof(BDRVVmdkState), | |
1534 | .bdrv_probe = vmdk_probe, | |
1535 | .bdrv_open = vmdk_open, | |
1536 | .bdrv_read = vmdk_read, | |
1537 | .bdrv_write = vmdk_write, | |
1538 | .bdrv_close = vmdk_close, | |
1539 | .bdrv_create = vmdk_create, | |
1540 | .bdrv_flush = vmdk_flush, | |
1541 | .bdrv_is_allocated = vmdk_is_allocated, | |
1542 | .bdrv_get_allocated_file_size = vmdk_get_allocated_file_size, | |
1543 | ||
1544 | .create_options = vmdk_create_options, | |
1545 | }; | |
1546 | ||
1547 | static void bdrv_vmdk_init(void) | |
1548 | { | |
1549 | bdrv_register(&bdrv_vmdk); | |
1550 | } | |
1551 | ||
1552 | block_init(bdrv_vmdk_init); |