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