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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_RGD (1 << 1) | |
35 | #define VMDK4_FLAG_COMPRESS (1 << 16) | |
36 | #define VMDK4_FLAG_MARKER (1 << 17) | |
37 | ||
38 | typedef struct { | |
39 | uint32_t version; | |
40 | uint32_t flags; | |
41 | uint32_t disk_sectors; | |
42 | uint32_t granularity; | |
43 | uint32_t l1dir_offset; | |
44 | uint32_t l1dir_size; | |
45 | uint32_t file_sectors; | |
46 | uint32_t cylinders; | |
47 | uint32_t heads; | |
48 | uint32_t sectors_per_track; | |
49 | } VMDK3Header; | |
50 | ||
51 | typedef struct { | |
52 | uint32_t version; | |
53 | uint32_t flags; | |
54 | int64_t capacity; | |
55 | int64_t granularity; | |
56 | int64_t desc_offset; | |
57 | int64_t desc_size; | |
58 | int32_t num_gtes_per_gte; | |
59 | int64_t gd_offset; | |
60 | int64_t rgd_offset; | |
61 | int64_t grain_offset; | |
62 | char filler[1]; | |
63 | char check_bytes[4]; | |
64 | uint16_t compressAlgorithm; | |
65 | } QEMU_PACKED VMDK4Header; | |
66 | ||
67 | #define L2_CACHE_SIZE 16 | |
68 | ||
69 | typedef struct VmdkExtent { | |
70 | BlockDriverState *file; | |
71 | bool flat; | |
72 | bool compressed; | |
73 | bool has_marker; | |
74 | int64_t sectors; | |
75 | int64_t end_sector; | |
76 | int64_t flat_start_offset; | |
77 | int64_t l1_table_offset; | |
78 | int64_t l1_backup_table_offset; | |
79 | uint32_t *l1_table; | |
80 | uint32_t *l1_backup_table; | |
81 | unsigned int l1_size; | |
82 | uint32_t l1_entry_sectors; | |
83 | ||
84 | unsigned int l2_size; | |
85 | uint32_t *l2_cache; | |
86 | uint32_t l2_cache_offsets[L2_CACHE_SIZE]; | |
87 | uint32_t l2_cache_counts[L2_CACHE_SIZE]; | |
88 | ||
89 | unsigned int cluster_sectors; | |
90 | } VmdkExtent; | |
91 | ||
92 | typedef struct BDRVVmdkState { | |
93 | CoMutex lock; | |
94 | int desc_offset; | |
95 | bool cid_updated; | |
96 | uint32_t parent_cid; | |
97 | int num_extents; | |
98 | /* Extent array with num_extents entries, ascend ordered by address */ | |
99 | VmdkExtent *extents; | |
100 | } BDRVVmdkState; | |
101 | ||
102 | typedef struct VmdkMetaData { | |
103 | uint32_t offset; | |
104 | unsigned int l1_index; | |
105 | unsigned int l2_index; | |
106 | unsigned int l2_offset; | |
107 | int valid; | |
108 | } VmdkMetaData; | |
109 | ||
110 | typedef struct VmdkGrainMarker { | |
111 | uint64_t lba; | |
112 | uint32_t size; | |
113 | uint8_t data[0]; | |
114 | } VmdkGrainMarker; | |
115 | ||
116 | static int vmdk_probe(const uint8_t *buf, int buf_size, const char *filename) | |
117 | { | |
118 | uint32_t magic; | |
119 | ||
120 | if (buf_size < 4) { | |
121 | return 0; | |
122 | } | |
123 | magic = be32_to_cpu(*(uint32_t *)buf); | |
124 | if (magic == VMDK3_MAGIC || | |
125 | magic == VMDK4_MAGIC) { | |
126 | return 100; | |
127 | } else { | |
128 | const char *p = (const char *)buf; | |
129 | const char *end = p + buf_size; | |
130 | while (p < end) { | |
131 | if (*p == '#') { | |
132 | /* skip comment line */ | |
133 | while (p < end && *p != '\n') { | |
134 | p++; | |
135 | } | |
136 | p++; | |
137 | continue; | |
138 | } | |
139 | if (*p == ' ') { | |
140 | while (p < end && *p == ' ') { | |
141 | p++; | |
142 | } | |
143 | /* skip '\r' if windows line endings used. */ | |
144 | if (p < end && *p == '\r') { | |
145 | p++; | |
146 | } | |
147 | /* only accept blank lines before 'version=' line */ | |
148 | if (p == end || *p != '\n') { | |
149 | return 0; | |
150 | } | |
151 | p++; | |
152 | continue; | |
153 | } | |
154 | if (end - p >= strlen("version=X\n")) { | |
155 | if (strncmp("version=1\n", p, strlen("version=1\n")) == 0 || | |
156 | strncmp("version=2\n", p, strlen("version=2\n")) == 0) { | |
157 | return 100; | |
158 | } | |
159 | } | |
160 | if (end - p >= strlen("version=X\r\n")) { | |
161 | if (strncmp("version=1\r\n", p, strlen("version=1\r\n")) == 0 || | |
162 | strncmp("version=2\r\n", p, strlen("version=2\r\n")) == 0) { | |
163 | return 100; | |
164 | } | |
165 | } | |
166 | return 0; | |
167 | } | |
168 | return 0; | |
169 | } | |
170 | } | |
171 | ||
172 | #define CHECK_CID 1 | |
173 | ||
174 | #define SECTOR_SIZE 512 | |
175 | #define DESC_SIZE (20 * SECTOR_SIZE) /* 20 sectors of 512 bytes each */ | |
176 | #define BUF_SIZE 4096 | |
177 | #define HEADER_SIZE 512 /* first sector of 512 bytes */ | |
178 | ||
179 | static void vmdk_free_extents(BlockDriverState *bs) | |
180 | { | |
181 | int i; | |
182 | BDRVVmdkState *s = bs->opaque; | |
183 | VmdkExtent *e; | |
184 | ||
185 | for (i = 0; i < s->num_extents; i++) { | |
186 | e = &s->extents[i]; | |
187 | g_free(e->l1_table); | |
188 | g_free(e->l2_cache); | |
189 | g_free(e->l1_backup_table); | |
190 | if (e->file != bs->file) { | |
191 | bdrv_delete(e->file); | |
192 | } | |
193 | } | |
194 | g_free(s->extents); | |
195 | } | |
196 | ||
197 | static void vmdk_free_last_extent(BlockDriverState *bs) | |
198 | { | |
199 | BDRVVmdkState *s = bs->opaque; | |
200 | ||
201 | if (s->num_extents == 0) { | |
202 | return; | |
203 | } | |
204 | s->num_extents--; | |
205 | s->extents = g_realloc(s->extents, s->num_extents * sizeof(VmdkExtent)); | |
206 | } | |
207 | ||
208 | static uint32_t vmdk_read_cid(BlockDriverState *bs, int parent) | |
209 | { | |
210 | char desc[DESC_SIZE]; | |
211 | uint32_t cid; | |
212 | const char *p_name, *cid_str; | |
213 | size_t cid_str_size; | |
214 | BDRVVmdkState *s = bs->opaque; | |
215 | ||
216 | if (bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE) != DESC_SIZE) { | |
217 | return 0; | |
218 | } | |
219 | ||
220 | if (parent) { | |
221 | cid_str = "parentCID"; | |
222 | cid_str_size = sizeof("parentCID"); | |
223 | } else { | |
224 | cid_str = "CID"; | |
225 | cid_str_size = sizeof("CID"); | |
226 | } | |
227 | ||
228 | p_name = strstr(desc, cid_str); | |
229 | if (p_name != NULL) { | |
230 | p_name += cid_str_size; | |
231 | sscanf(p_name, "%x", &cid); | |
232 | } | |
233 | ||
234 | return cid; | |
235 | } | |
236 | ||
237 | static int vmdk_write_cid(BlockDriverState *bs, uint32_t cid) | |
238 | { | |
239 | char desc[DESC_SIZE], tmp_desc[DESC_SIZE]; | |
240 | char *p_name, *tmp_str; | |
241 | BDRVVmdkState *s = bs->opaque; | |
242 | ||
243 | memset(desc, 0, sizeof(desc)); | |
244 | if (bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE) != DESC_SIZE) { | |
245 | return -EIO; | |
246 | } | |
247 | ||
248 | tmp_str = strstr(desc, "parentCID"); | |
249 | pstrcpy(tmp_desc, sizeof(tmp_desc), tmp_str); | |
250 | p_name = strstr(desc, "CID"); | |
251 | if (p_name != NULL) { | |
252 | p_name += sizeof("CID"); | |
253 | snprintf(p_name, sizeof(desc) - (p_name - desc), "%x\n", cid); | |
254 | pstrcat(desc, sizeof(desc), tmp_desc); | |
255 | } | |
256 | ||
257 | if (bdrv_pwrite_sync(bs->file, s->desc_offset, desc, DESC_SIZE) < 0) { | |
258 | return -EIO; | |
259 | } | |
260 | return 0; | |
261 | } | |
262 | ||
263 | static int vmdk_is_cid_valid(BlockDriverState *bs) | |
264 | { | |
265 | #ifdef CHECK_CID | |
266 | BDRVVmdkState *s = bs->opaque; | |
267 | BlockDriverState *p_bs = bs->backing_hd; | |
268 | uint32_t cur_pcid; | |
269 | ||
270 | if (p_bs) { | |
271 | cur_pcid = vmdk_read_cid(p_bs, 0); | |
272 | if (s->parent_cid != cur_pcid) { | |
273 | /* CID not valid */ | |
274 | return 0; | |
275 | } | |
276 | } | |
277 | #endif | |
278 | /* CID valid */ | |
279 | return 1; | |
280 | } | |
281 | ||
282 | static int vmdk_parent_open(BlockDriverState *bs) | |
283 | { | |
284 | char *p_name; | |
285 | char desc[DESC_SIZE + 1]; | |
286 | BDRVVmdkState *s = bs->opaque; | |
287 | int ret; | |
288 | ||
289 | desc[DESC_SIZE] = '\0'; | |
290 | ret = bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE); | |
291 | if (ret < 0) { | |
292 | return ret; | |
293 | } | |
294 | ||
295 | p_name = strstr(desc, "parentFileNameHint"); | |
296 | if (p_name != NULL) { | |
297 | char *end_name; | |
298 | ||
299 | p_name += sizeof("parentFileNameHint") + 1; | |
300 | end_name = strchr(p_name, '\"'); | |
301 | if (end_name == NULL) { | |
302 | return -EINVAL; | |
303 | } | |
304 | if ((end_name - p_name) > sizeof(bs->backing_file) - 1) { | |
305 | return -EINVAL; | |
306 | } | |
307 | ||
308 | pstrcpy(bs->backing_file, end_name - p_name + 1, p_name); | |
309 | } | |
310 | ||
311 | return 0; | |
312 | } | |
313 | ||
314 | /* Create and append extent to the extent array. Return the added VmdkExtent | |
315 | * address. return NULL if allocation failed. */ | |
316 | static VmdkExtent *vmdk_add_extent(BlockDriverState *bs, | |
317 | BlockDriverState *file, bool flat, int64_t sectors, | |
318 | int64_t l1_offset, int64_t l1_backup_offset, | |
319 | uint32_t l1_size, | |
320 | int l2_size, unsigned int cluster_sectors) | |
321 | { | |
322 | VmdkExtent *extent; | |
323 | BDRVVmdkState *s = bs->opaque; | |
324 | ||
325 | s->extents = g_realloc(s->extents, | |
326 | (s->num_extents + 1) * sizeof(VmdkExtent)); | |
327 | extent = &s->extents[s->num_extents]; | |
328 | s->num_extents++; | |
329 | ||
330 | memset(extent, 0, sizeof(VmdkExtent)); | |
331 | extent->file = file; | |
332 | extent->flat = flat; | |
333 | extent->sectors = sectors; | |
334 | extent->l1_table_offset = l1_offset; | |
335 | extent->l1_backup_table_offset = l1_backup_offset; | |
336 | extent->l1_size = l1_size; | |
337 | extent->l1_entry_sectors = l2_size * cluster_sectors; | |
338 | extent->l2_size = l2_size; | |
339 | extent->cluster_sectors = cluster_sectors; | |
340 | ||
341 | if (s->num_extents > 1) { | |
342 | extent->end_sector = (*(extent - 1)).end_sector + extent->sectors; | |
343 | } else { | |
344 | extent->end_sector = extent->sectors; | |
345 | } | |
346 | bs->total_sectors = extent->end_sector; | |
347 | return extent; | |
348 | } | |
349 | ||
350 | static int vmdk_init_tables(BlockDriverState *bs, VmdkExtent *extent) | |
351 | { | |
352 | int ret; | |
353 | int l1_size, i; | |
354 | ||
355 | /* read the L1 table */ | |
356 | l1_size = extent->l1_size * sizeof(uint32_t); | |
357 | extent->l1_table = g_malloc(l1_size); | |
358 | ret = bdrv_pread(extent->file, | |
359 | extent->l1_table_offset, | |
360 | extent->l1_table, | |
361 | l1_size); | |
362 | if (ret < 0) { | |
363 | goto fail_l1; | |
364 | } | |
365 | for (i = 0; i < extent->l1_size; i++) { | |
366 | le32_to_cpus(&extent->l1_table[i]); | |
367 | } | |
368 | ||
369 | if (extent->l1_backup_table_offset) { | |
370 | extent->l1_backup_table = g_malloc(l1_size); | |
371 | ret = bdrv_pread(extent->file, | |
372 | extent->l1_backup_table_offset, | |
373 | extent->l1_backup_table, | |
374 | l1_size); | |
375 | if (ret < 0) { | |
376 | goto fail_l1b; | |
377 | } | |
378 | for (i = 0; i < extent->l1_size; i++) { | |
379 | le32_to_cpus(&extent->l1_backup_table[i]); | |
380 | } | |
381 | } | |
382 | ||
383 | extent->l2_cache = | |
384 | g_malloc(extent->l2_size * L2_CACHE_SIZE * sizeof(uint32_t)); | |
385 | return 0; | |
386 | fail_l1b: | |
387 | g_free(extent->l1_backup_table); | |
388 | fail_l1: | |
389 | g_free(extent->l1_table); | |
390 | return ret; | |
391 | } | |
392 | ||
393 | static int vmdk_open_vmdk3(BlockDriverState *bs, | |
394 | BlockDriverState *file, | |
395 | int flags) | |
396 | { | |
397 | int ret; | |
398 | uint32_t magic; | |
399 | VMDK3Header header; | |
400 | VmdkExtent *extent; | |
401 | ||
402 | ret = bdrv_pread(file, sizeof(magic), &header, sizeof(header)); | |
403 | if (ret < 0) { | |
404 | return ret; | |
405 | } | |
406 | extent = vmdk_add_extent(bs, | |
407 | bs->file, false, | |
408 | le32_to_cpu(header.disk_sectors), | |
409 | le32_to_cpu(header.l1dir_offset) << 9, | |
410 | 0, 1 << 6, 1 << 9, | |
411 | le32_to_cpu(header.granularity)); | |
412 | ret = vmdk_init_tables(bs, extent); | |
413 | if (ret) { | |
414 | /* free extent allocated by vmdk_add_extent */ | |
415 | vmdk_free_last_extent(bs); | |
416 | } | |
417 | return ret; | |
418 | } | |
419 | ||
420 | static int vmdk_open_desc_file(BlockDriverState *bs, int flags, | |
421 | int64_t desc_offset); | |
422 | ||
423 | static int vmdk_open_vmdk4(BlockDriverState *bs, | |
424 | BlockDriverState *file, | |
425 | int flags) | |
426 | { | |
427 | int ret; | |
428 | uint32_t magic; | |
429 | uint32_t l1_size, l1_entry_sectors; | |
430 | VMDK4Header header; | |
431 | VmdkExtent *extent; | |
432 | int64_t l1_backup_offset = 0; | |
433 | ||
434 | ret = bdrv_pread(file, sizeof(magic), &header, sizeof(header)); | |
435 | if (ret < 0) { | |
436 | return ret; | |
437 | } | |
438 | if (header.capacity == 0 && header.desc_offset) { | |
439 | return vmdk_open_desc_file(bs, flags, header.desc_offset << 9); | |
440 | } | |
441 | l1_entry_sectors = le32_to_cpu(header.num_gtes_per_gte) | |
442 | * le64_to_cpu(header.granularity); | |
443 | if (l1_entry_sectors <= 0) { | |
444 | return -EINVAL; | |
445 | } | |
446 | l1_size = (le64_to_cpu(header.capacity) + l1_entry_sectors - 1) | |
447 | / l1_entry_sectors; | |
448 | if (le32_to_cpu(header.flags) & VMDK4_FLAG_RGD) { | |
449 | l1_backup_offset = le64_to_cpu(header.rgd_offset) << 9; | |
450 | } | |
451 | extent = vmdk_add_extent(bs, file, false, | |
452 | le64_to_cpu(header.capacity), | |
453 | le64_to_cpu(header.gd_offset) << 9, | |
454 | l1_backup_offset, | |
455 | l1_size, | |
456 | le32_to_cpu(header.num_gtes_per_gte), | |
457 | le64_to_cpu(header.granularity)); | |
458 | extent->compressed = | |
459 | le16_to_cpu(header.compressAlgorithm) == VMDK4_COMPRESSION_DEFLATE; | |
460 | extent->has_marker = le32_to_cpu(header.flags) & VMDK4_FLAG_MARKER; | |
461 | ret = vmdk_init_tables(bs, extent); | |
462 | if (ret) { | |
463 | /* free extent allocated by vmdk_add_extent */ | |
464 | vmdk_free_last_extent(bs); | |
465 | } | |
466 | return ret; | |
467 | } | |
468 | ||
469 | /* find an option value out of descriptor file */ | |
470 | static int vmdk_parse_description(const char *desc, const char *opt_name, | |
471 | char *buf, int buf_size) | |
472 | { | |
473 | char *opt_pos, *opt_end; | |
474 | const char *end = desc + strlen(desc); | |
475 | ||
476 | opt_pos = strstr(desc, opt_name); | |
477 | if (!opt_pos) { | |
478 | return -1; | |
479 | } | |
480 | /* Skip "=\"" following opt_name */ | |
481 | opt_pos += strlen(opt_name) + 2; | |
482 | if (opt_pos >= end) { | |
483 | return -1; | |
484 | } | |
485 | opt_end = opt_pos; | |
486 | while (opt_end < end && *opt_end != '"') { | |
487 | opt_end++; | |
488 | } | |
489 | if (opt_end == end || buf_size < opt_end - opt_pos + 1) { | |
490 | return -1; | |
491 | } | |
492 | pstrcpy(buf, opt_end - opt_pos + 1, opt_pos); | |
493 | return 0; | |
494 | } | |
495 | ||
496 | /* Open an extent file and append to bs array */ | |
497 | static int vmdk_open_sparse(BlockDriverState *bs, | |
498 | BlockDriverState *file, | |
499 | int flags) | |
500 | { | |
501 | uint32_t magic; | |
502 | ||
503 | if (bdrv_pread(file, 0, &magic, sizeof(magic)) != sizeof(magic)) { | |
504 | return -EIO; | |
505 | } | |
506 | ||
507 | magic = be32_to_cpu(magic); | |
508 | switch (magic) { | |
509 | case VMDK3_MAGIC: | |
510 | return vmdk_open_vmdk3(bs, file, flags); | |
511 | break; | |
512 | case VMDK4_MAGIC: | |
513 | return vmdk_open_vmdk4(bs, file, flags); | |
514 | break; | |
515 | default: | |
516 | return -EINVAL; | |
517 | break; | |
518 | } | |
519 | } | |
520 | ||
521 | static int vmdk_parse_extents(const char *desc, BlockDriverState *bs, | |
522 | const char *desc_file_path) | |
523 | { | |
524 | int ret; | |
525 | char access[11]; | |
526 | char type[11]; | |
527 | char fname[512]; | |
528 | const char *p = desc; | |
529 | int64_t sectors = 0; | |
530 | int64_t flat_offset; | |
531 | char extent_path[PATH_MAX]; | |
532 | BlockDriverState *extent_file; | |
533 | ||
534 | while (*p) { | |
535 | /* parse extent line: | |
536 | * RW [size in sectors] FLAT "file-name.vmdk" OFFSET | |
537 | * or | |
538 | * RW [size in sectors] SPARSE "file-name.vmdk" | |
539 | */ | |
540 | flat_offset = -1; | |
541 | ret = sscanf(p, "%10s %" SCNd64 " %10s %511s %" SCNd64, | |
542 | access, §ors, type, fname, &flat_offset); | |
543 | if (ret < 4 || strcmp(access, "RW")) { | |
544 | goto next_line; | |
545 | } else if (!strcmp(type, "FLAT")) { | |
546 | if (ret != 5 || flat_offset < 0) { | |
547 | return -EINVAL; | |
548 | } | |
549 | } else if (ret != 4) { | |
550 | return -EINVAL; | |
551 | } | |
552 | ||
553 | /* trim the quotation marks around */ | |
554 | if (fname[0] == '"') { | |
555 | memmove(fname, fname + 1, strlen(fname)); | |
556 | if (strlen(fname) <= 1 || fname[strlen(fname) - 1] != '"') { | |
557 | return -EINVAL; | |
558 | } | |
559 | fname[strlen(fname) - 1] = '\0'; | |
560 | } | |
561 | if (sectors <= 0 || | |
562 | (strcmp(type, "FLAT") && strcmp(type, "SPARSE")) || | |
563 | (strcmp(access, "RW"))) { | |
564 | goto next_line; | |
565 | } | |
566 | ||
567 | path_combine(extent_path, sizeof(extent_path), | |
568 | desc_file_path, fname); | |
569 | ret = bdrv_file_open(&extent_file, extent_path, bs->open_flags); | |
570 | if (ret) { | |
571 | return ret; | |
572 | } | |
573 | ||
574 | /* save to extents array */ | |
575 | if (!strcmp(type, "FLAT")) { | |
576 | /* FLAT extent */ | |
577 | VmdkExtent *extent; | |
578 | ||
579 | extent = vmdk_add_extent(bs, extent_file, true, sectors, | |
580 | 0, 0, 0, 0, sectors); | |
581 | extent->flat_start_offset = flat_offset << 9; | |
582 | } else if (!strcmp(type, "SPARSE")) { | |
583 | /* SPARSE extent */ | |
584 | ret = vmdk_open_sparse(bs, extent_file, bs->open_flags); | |
585 | if (ret) { | |
586 | bdrv_delete(extent_file); | |
587 | return ret; | |
588 | } | |
589 | } else { | |
590 | fprintf(stderr, | |
591 | "VMDK: Not supported extent type \"%s\""".\n", type); | |
592 | return -ENOTSUP; | |
593 | } | |
594 | next_line: | |
595 | /* move to next line */ | |
596 | while (*p && *p != '\n') { | |
597 | p++; | |
598 | } | |
599 | p++; | |
600 | } | |
601 | return 0; | |
602 | } | |
603 | ||
604 | static int vmdk_open_desc_file(BlockDriverState *bs, int flags, | |
605 | int64_t desc_offset) | |
606 | { | |
607 | int ret; | |
608 | char buf[2048]; | |
609 | char ct[128]; | |
610 | BDRVVmdkState *s = bs->opaque; | |
611 | ||
612 | ret = bdrv_pread(bs->file, desc_offset, buf, sizeof(buf)); | |
613 | if (ret < 0) { | |
614 | return ret; | |
615 | } | |
616 | buf[2047] = '\0'; | |
617 | if (vmdk_parse_description(buf, "createType", ct, sizeof(ct))) { | |
618 | return -EINVAL; | |
619 | } | |
620 | if (strcmp(ct, "monolithicFlat") && | |
621 | strcmp(ct, "twoGbMaxExtentSparse") && | |
622 | strcmp(ct, "twoGbMaxExtentFlat")) { | |
623 | fprintf(stderr, | |
624 | "VMDK: Not supported image type \"%s\""".\n", ct); | |
625 | return -ENOTSUP; | |
626 | } | |
627 | s->desc_offset = 0; | |
628 | return vmdk_parse_extents(buf, bs, bs->file->filename); | |
629 | } | |
630 | ||
631 | static int vmdk_open(BlockDriverState *bs, int flags) | |
632 | { | |
633 | int ret; | |
634 | BDRVVmdkState *s = bs->opaque; | |
635 | ||
636 | if (vmdk_open_sparse(bs, bs->file, flags) == 0) { | |
637 | s->desc_offset = 0x200; | |
638 | } else { | |
639 | ret = vmdk_open_desc_file(bs, flags, 0); | |
640 | if (ret) { | |
641 | goto fail; | |
642 | } | |
643 | } | |
644 | /* try to open parent images, if exist */ | |
645 | ret = vmdk_parent_open(bs); | |
646 | if (ret) { | |
647 | goto fail; | |
648 | } | |
649 | s->parent_cid = vmdk_read_cid(bs, 1); | |
650 | qemu_co_mutex_init(&s->lock); | |
651 | return ret; | |
652 | ||
653 | fail: | |
654 | vmdk_free_extents(bs); | |
655 | return ret; | |
656 | } | |
657 | ||
658 | static int get_whole_cluster(BlockDriverState *bs, | |
659 | VmdkExtent *extent, | |
660 | uint64_t cluster_offset, | |
661 | uint64_t offset, | |
662 | bool allocate) | |
663 | { | |
664 | /* 128 sectors * 512 bytes each = grain size 64KB */ | |
665 | uint8_t whole_grain[extent->cluster_sectors * 512]; | |
666 | ||
667 | /* we will be here if it's first write on non-exist grain(cluster). | |
668 | * try to read from parent image, if exist */ | |
669 | if (bs->backing_hd) { | |
670 | int ret; | |
671 | ||
672 | if (!vmdk_is_cid_valid(bs)) { | |
673 | return -1; | |
674 | } | |
675 | ||
676 | /* floor offset to cluster */ | |
677 | offset -= offset % (extent->cluster_sectors * 512); | |
678 | ret = bdrv_read(bs->backing_hd, offset >> 9, whole_grain, | |
679 | extent->cluster_sectors); | |
680 | if (ret < 0) { | |
681 | return -1; | |
682 | } | |
683 | ||
684 | /* Write grain only into the active image */ | |
685 | ret = bdrv_write(extent->file, cluster_offset, whole_grain, | |
686 | extent->cluster_sectors); | |
687 | if (ret < 0) { | |
688 | return -1; | |
689 | } | |
690 | } | |
691 | return 0; | |
692 | } | |
693 | ||
694 | static int vmdk_L2update(VmdkExtent *extent, VmdkMetaData *m_data) | |
695 | { | |
696 | /* update L2 table */ | |
697 | if (bdrv_pwrite_sync( | |
698 | extent->file, | |
699 | ((int64_t)m_data->l2_offset * 512) | |
700 | + (m_data->l2_index * sizeof(m_data->offset)), | |
701 | &(m_data->offset), | |
702 | sizeof(m_data->offset) | |
703 | ) < 0) { | |
704 | return -1; | |
705 | } | |
706 | /* update backup L2 table */ | |
707 | if (extent->l1_backup_table_offset != 0) { | |
708 | m_data->l2_offset = extent->l1_backup_table[m_data->l1_index]; | |
709 | if (bdrv_pwrite_sync( | |
710 | extent->file, | |
711 | ((int64_t)m_data->l2_offset * 512) | |
712 | + (m_data->l2_index * sizeof(m_data->offset)), | |
713 | &(m_data->offset), sizeof(m_data->offset) | |
714 | ) < 0) { | |
715 | return -1; | |
716 | } | |
717 | } | |
718 | ||
719 | return 0; | |
720 | } | |
721 | ||
722 | static int get_cluster_offset(BlockDriverState *bs, | |
723 | VmdkExtent *extent, | |
724 | VmdkMetaData *m_data, | |
725 | uint64_t offset, | |
726 | int allocate, | |
727 | uint64_t *cluster_offset) | |
728 | { | |
729 | unsigned int l1_index, l2_offset, l2_index; | |
730 | int min_index, i, j; | |
731 | uint32_t min_count, *l2_table, tmp = 0; | |
732 | ||
733 | if (m_data) { | |
734 | m_data->valid = 0; | |
735 | } | |
736 | if (extent->flat) { | |
737 | *cluster_offset = extent->flat_start_offset; | |
738 | return 0; | |
739 | } | |
740 | ||
741 | offset -= (extent->end_sector - extent->sectors) * SECTOR_SIZE; | |
742 | l1_index = (offset >> 9) / extent->l1_entry_sectors; | |
743 | if (l1_index >= extent->l1_size) { | |
744 | return -1; | |
745 | } | |
746 | l2_offset = extent->l1_table[l1_index]; | |
747 | if (!l2_offset) { | |
748 | return -1; | |
749 | } | |
750 | for (i = 0; i < L2_CACHE_SIZE; i++) { | |
751 | if (l2_offset == extent->l2_cache_offsets[i]) { | |
752 | /* increment the hit count */ | |
753 | if (++extent->l2_cache_counts[i] == 0xffffffff) { | |
754 | for (j = 0; j < L2_CACHE_SIZE; j++) { | |
755 | extent->l2_cache_counts[j] >>= 1; | |
756 | } | |
757 | } | |
758 | l2_table = extent->l2_cache + (i * extent->l2_size); | |
759 | goto found; | |
760 | } | |
761 | } | |
762 | /* not found: load a new entry in the least used one */ | |
763 | min_index = 0; | |
764 | min_count = 0xffffffff; | |
765 | for (i = 0; i < L2_CACHE_SIZE; i++) { | |
766 | if (extent->l2_cache_counts[i] < min_count) { | |
767 | min_count = extent->l2_cache_counts[i]; | |
768 | min_index = i; | |
769 | } | |
770 | } | |
771 | l2_table = extent->l2_cache + (min_index * extent->l2_size); | |
772 | if (bdrv_pread( | |
773 | extent->file, | |
774 | (int64_t)l2_offset * 512, | |
775 | l2_table, | |
776 | extent->l2_size * sizeof(uint32_t) | |
777 | ) != extent->l2_size * sizeof(uint32_t)) { | |
778 | return -1; | |
779 | } | |
780 | ||
781 | extent->l2_cache_offsets[min_index] = l2_offset; | |
782 | extent->l2_cache_counts[min_index] = 1; | |
783 | found: | |
784 | l2_index = ((offset >> 9) / extent->cluster_sectors) % extent->l2_size; | |
785 | *cluster_offset = le32_to_cpu(l2_table[l2_index]); | |
786 | ||
787 | if (!*cluster_offset) { | |
788 | if (!allocate) { | |
789 | return -1; | |
790 | } | |
791 | ||
792 | /* Avoid the L2 tables update for the images that have snapshots. */ | |
793 | *cluster_offset = bdrv_getlength(extent->file); | |
794 | if (!extent->compressed) { | |
795 | bdrv_truncate( | |
796 | extent->file, | |
797 | *cluster_offset + (extent->cluster_sectors << 9) | |
798 | ); | |
799 | } | |
800 | ||
801 | *cluster_offset >>= 9; | |
802 | tmp = cpu_to_le32(*cluster_offset); | |
803 | l2_table[l2_index] = tmp; | |
804 | ||
805 | /* First of all we write grain itself, to avoid race condition | |
806 | * that may to corrupt the image. | |
807 | * This problem may occur because of insufficient space on host disk | |
808 | * or inappropriate VM shutdown. | |
809 | */ | |
810 | if (get_whole_cluster( | |
811 | bs, extent, *cluster_offset, offset, allocate) == -1) { | |
812 | return -1; | |
813 | } | |
814 | ||
815 | if (m_data) { | |
816 | m_data->offset = tmp; | |
817 | m_data->l1_index = l1_index; | |
818 | m_data->l2_index = l2_index; | |
819 | m_data->l2_offset = l2_offset; | |
820 | m_data->valid = 1; | |
821 | } | |
822 | } | |
823 | *cluster_offset <<= 9; | |
824 | return 0; | |
825 | } | |
826 | ||
827 | static VmdkExtent *find_extent(BDRVVmdkState *s, | |
828 | int64_t sector_num, VmdkExtent *start_hint) | |
829 | { | |
830 | VmdkExtent *extent = start_hint; | |
831 | ||
832 | if (!extent) { | |
833 | extent = &s->extents[0]; | |
834 | } | |
835 | while (extent < &s->extents[s->num_extents]) { | |
836 | if (sector_num < extent->end_sector) { | |
837 | return extent; | |
838 | } | |
839 | extent++; | |
840 | } | |
841 | return NULL; | |
842 | } | |
843 | ||
844 | static int vmdk_is_allocated(BlockDriverState *bs, int64_t sector_num, | |
845 | int nb_sectors, int *pnum) | |
846 | { | |
847 | BDRVVmdkState *s = bs->opaque; | |
848 | int64_t index_in_cluster, n, ret; | |
849 | uint64_t offset; | |
850 | VmdkExtent *extent; | |
851 | ||
852 | extent = find_extent(s, sector_num, NULL); | |
853 | if (!extent) { | |
854 | return 0; | |
855 | } | |
856 | ret = get_cluster_offset(bs, extent, NULL, | |
857 | sector_num * 512, 0, &offset); | |
858 | /* get_cluster_offset returning 0 means success */ | |
859 | ret = !ret; | |
860 | ||
861 | index_in_cluster = sector_num % extent->cluster_sectors; | |
862 | n = extent->cluster_sectors - index_in_cluster; | |
863 | if (n > nb_sectors) { | |
864 | n = nb_sectors; | |
865 | } | |
866 | *pnum = n; | |
867 | return ret; | |
868 | } | |
869 | ||
870 | static int vmdk_write_extent(VmdkExtent *extent, int64_t cluster_offset, | |
871 | int64_t offset_in_cluster, const uint8_t *buf, | |
872 | int nb_sectors, int64_t sector_num) | |
873 | { | |
874 | int ret; | |
875 | VmdkGrainMarker *data = NULL; | |
876 | uLongf buf_len; | |
877 | const uint8_t *write_buf = buf; | |
878 | int write_len = nb_sectors * 512; | |
879 | ||
880 | if (extent->compressed) { | |
881 | if (!extent->has_marker) { | |
882 | ret = -EINVAL; | |
883 | goto out; | |
884 | } | |
885 | buf_len = (extent->cluster_sectors << 9) * 2; | |
886 | data = g_malloc(buf_len + sizeof(VmdkGrainMarker)); | |
887 | if (compress(data->data, &buf_len, buf, nb_sectors << 9) != Z_OK || | |
888 | buf_len == 0) { | |
889 | ret = -EINVAL; | |
890 | goto out; | |
891 | } | |
892 | data->lba = sector_num; | |
893 | data->size = buf_len; | |
894 | write_buf = (uint8_t *)data; | |
895 | write_len = buf_len + sizeof(VmdkGrainMarker); | |
896 | } | |
897 | ret = bdrv_pwrite(extent->file, | |
898 | cluster_offset + offset_in_cluster, | |
899 | write_buf, | |
900 | write_len); | |
901 | if (ret != write_len) { | |
902 | ret = ret < 0 ? ret : -EIO; | |
903 | goto out; | |
904 | } | |
905 | ret = 0; | |
906 | out: | |
907 | g_free(data); | |
908 | return ret; | |
909 | } | |
910 | ||
911 | static int vmdk_read_extent(VmdkExtent *extent, int64_t cluster_offset, | |
912 | int64_t offset_in_cluster, uint8_t *buf, | |
913 | int nb_sectors) | |
914 | { | |
915 | int ret; | |
916 | int cluster_bytes, buf_bytes; | |
917 | uint8_t *cluster_buf, *compressed_data; | |
918 | uint8_t *uncomp_buf; | |
919 | uint32_t data_len; | |
920 | VmdkGrainMarker *marker; | |
921 | uLongf buf_len; | |
922 | ||
923 | ||
924 | if (!extent->compressed) { | |
925 | ret = bdrv_pread(extent->file, | |
926 | cluster_offset + offset_in_cluster, | |
927 | buf, nb_sectors * 512); | |
928 | if (ret == nb_sectors * 512) { | |
929 | return 0; | |
930 | } else { | |
931 | return -EIO; | |
932 | } | |
933 | } | |
934 | cluster_bytes = extent->cluster_sectors * 512; | |
935 | /* Read two clusters in case GrainMarker + compressed data > one cluster */ | |
936 | buf_bytes = cluster_bytes * 2; | |
937 | cluster_buf = g_malloc(buf_bytes); | |
938 | uncomp_buf = g_malloc(cluster_bytes); | |
939 | ret = bdrv_pread(extent->file, | |
940 | cluster_offset, | |
941 | cluster_buf, buf_bytes); | |
942 | if (ret < 0) { | |
943 | goto out; | |
944 | } | |
945 | compressed_data = cluster_buf; | |
946 | buf_len = cluster_bytes; | |
947 | data_len = cluster_bytes; | |
948 | if (extent->has_marker) { | |
949 | marker = (VmdkGrainMarker *)cluster_buf; | |
950 | compressed_data = marker->data; | |
951 | data_len = le32_to_cpu(marker->size); | |
952 | } | |
953 | if (!data_len || data_len > buf_bytes) { | |
954 | ret = -EINVAL; | |
955 | goto out; | |
956 | } | |
957 | ret = uncompress(uncomp_buf, &buf_len, compressed_data, data_len); | |
958 | if (ret != Z_OK) { | |
959 | ret = -EINVAL; | |
960 | goto out; | |
961 | ||
962 | } | |
963 | if (offset_in_cluster < 0 || | |
964 | offset_in_cluster + nb_sectors * 512 > buf_len) { | |
965 | ret = -EINVAL; | |
966 | goto out; | |
967 | } | |
968 | memcpy(buf, uncomp_buf + offset_in_cluster, nb_sectors * 512); | |
969 | ret = 0; | |
970 | ||
971 | out: | |
972 | g_free(uncomp_buf); | |
973 | g_free(cluster_buf); | |
974 | return ret; | |
975 | } | |
976 | ||
977 | static int vmdk_read(BlockDriverState *bs, int64_t sector_num, | |
978 | uint8_t *buf, int nb_sectors) | |
979 | { | |
980 | BDRVVmdkState *s = bs->opaque; | |
981 | int ret; | |
982 | uint64_t n, index_in_cluster; | |
983 | VmdkExtent *extent = NULL; | |
984 | uint64_t cluster_offset; | |
985 | ||
986 | while (nb_sectors > 0) { | |
987 | extent = find_extent(s, sector_num, extent); | |
988 | if (!extent) { | |
989 | return -EIO; | |
990 | } | |
991 | ret = get_cluster_offset( | |
992 | bs, extent, NULL, | |
993 | sector_num << 9, 0, &cluster_offset); | |
994 | index_in_cluster = sector_num % extent->cluster_sectors; | |
995 | n = extent->cluster_sectors - index_in_cluster; | |
996 | if (n > nb_sectors) { | |
997 | n = nb_sectors; | |
998 | } | |
999 | if (ret) { | |
1000 | /* if not allocated, try to read from parent image, if exist */ | |
1001 | if (bs->backing_hd) { | |
1002 | if (!vmdk_is_cid_valid(bs)) { | |
1003 | return -EINVAL; | |
1004 | } | |
1005 | ret = bdrv_read(bs->backing_hd, sector_num, buf, n); | |
1006 | if (ret < 0) { | |
1007 | return ret; | |
1008 | } | |
1009 | } else { | |
1010 | memset(buf, 0, 512 * n); | |
1011 | } | |
1012 | } else { | |
1013 | ret = vmdk_read_extent(extent, | |
1014 | cluster_offset, index_in_cluster * 512, | |
1015 | buf, n); | |
1016 | if (ret) { | |
1017 | return ret; | |
1018 | } | |
1019 | } | |
1020 | nb_sectors -= n; | |
1021 | sector_num += n; | |
1022 | buf += n * 512; | |
1023 | } | |
1024 | return 0; | |
1025 | } | |
1026 | ||
1027 | static int vmdk_write(BlockDriverState *bs, int64_t sector_num, | |
1028 | const uint8_t *buf, int nb_sectors) | |
1029 | { | |
1030 | BDRVVmdkState *s = bs->opaque; | |
1031 | VmdkExtent *extent = NULL; | |
1032 | int n, ret; | |
1033 | int64_t index_in_cluster; | |
1034 | uint64_t cluster_offset; | |
1035 | VmdkMetaData m_data; | |
1036 | ||
1037 | if (sector_num > bs->total_sectors) { | |
1038 | fprintf(stderr, | |
1039 | "(VMDK) Wrong offset: sector_num=0x%" PRIx64 | |
1040 | " total_sectors=0x%" PRIx64 "\n", | |
1041 | sector_num, bs->total_sectors); | |
1042 | return -EIO; | |
1043 | } | |
1044 | ||
1045 | while (nb_sectors > 0) { | |
1046 | extent = find_extent(s, sector_num, extent); | |
1047 | if (!extent) { | |
1048 | return -EIO; | |
1049 | } | |
1050 | ret = get_cluster_offset( | |
1051 | bs, | |
1052 | extent, | |
1053 | &m_data, | |
1054 | sector_num << 9, !extent->compressed, | |
1055 | &cluster_offset); | |
1056 | if (extent->compressed) { | |
1057 | if (ret == 0) { | |
1058 | /* Refuse write to allocated cluster for streamOptimized */ | |
1059 | fprintf(stderr, | |
1060 | "VMDK: can't write to allocated cluster" | |
1061 | " for streamOptimized\n"); | |
1062 | return -EIO; | |
1063 | } else { | |
1064 | /* allocate */ | |
1065 | ret = get_cluster_offset( | |
1066 | bs, | |
1067 | extent, | |
1068 | &m_data, | |
1069 | sector_num << 9, 1, | |
1070 | &cluster_offset); | |
1071 | } | |
1072 | } | |
1073 | if (ret) { | |
1074 | return -EINVAL; | |
1075 | } | |
1076 | index_in_cluster = sector_num % extent->cluster_sectors; | |
1077 | n = extent->cluster_sectors - index_in_cluster; | |
1078 | if (n > nb_sectors) { | |
1079 | n = nb_sectors; | |
1080 | } | |
1081 | ||
1082 | ret = vmdk_write_extent(extent, | |
1083 | cluster_offset, index_in_cluster * 512, | |
1084 | buf, n, sector_num); | |
1085 | if (ret) { | |
1086 | return ret; | |
1087 | } | |
1088 | if (m_data.valid) { | |
1089 | /* update L2 tables */ | |
1090 | if (vmdk_L2update(extent, &m_data) == -1) { | |
1091 | return -EIO; | |
1092 | } | |
1093 | } | |
1094 | nb_sectors -= n; | |
1095 | sector_num += n; | |
1096 | buf += n * 512; | |
1097 | ||
1098 | /* update CID on the first write every time the virtual disk is | |
1099 | * opened */ | |
1100 | if (!s->cid_updated) { | |
1101 | vmdk_write_cid(bs, time(NULL)); | |
1102 | s->cid_updated = true; | |
1103 | } | |
1104 | } | |
1105 | return 0; | |
1106 | } | |
1107 | ||
1108 | ||
1109 | static int vmdk_create_extent(const char *filename, int64_t filesize, | |
1110 | bool flat, bool compress) | |
1111 | { | |
1112 | int ret, i; | |
1113 | int fd = 0; | |
1114 | VMDK4Header header; | |
1115 | uint32_t tmp, magic, grains, gd_size, gt_size, gt_count; | |
1116 | ||
1117 | fd = open( | |
1118 | filename, | |
1119 | O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, | |
1120 | 0644); | |
1121 | if (fd < 0) { | |
1122 | return -errno; | |
1123 | } | |
1124 | if (flat) { | |
1125 | ret = ftruncate(fd, filesize); | |
1126 | if (ret < 0) { | |
1127 | ret = -errno; | |
1128 | } | |
1129 | goto exit; | |
1130 | } | |
1131 | magic = cpu_to_be32(VMDK4_MAGIC); | |
1132 | memset(&header, 0, sizeof(header)); | |
1133 | header.version = 1; | |
1134 | header.flags = | |
1135 | 3 | (compress ? VMDK4_FLAG_COMPRESS | VMDK4_FLAG_MARKER : 0); | |
1136 | header.compressAlgorithm = compress ? VMDK4_COMPRESSION_DEFLATE : 0; | |
1137 | header.capacity = filesize / 512; | |
1138 | header.granularity = 128; | |
1139 | header.num_gtes_per_gte = 512; | |
1140 | ||
1141 | grains = (filesize / 512 + header.granularity - 1) / header.granularity; | |
1142 | gt_size = ((header.num_gtes_per_gte * sizeof(uint32_t)) + 511) >> 9; | |
1143 | gt_count = | |
1144 | (grains + header.num_gtes_per_gte - 1) / header.num_gtes_per_gte; | |
1145 | gd_size = (gt_count * sizeof(uint32_t) + 511) >> 9; | |
1146 | ||
1147 | header.desc_offset = 1; | |
1148 | header.desc_size = 20; | |
1149 | header.rgd_offset = header.desc_offset + header.desc_size; | |
1150 | header.gd_offset = header.rgd_offset + gd_size + (gt_size * gt_count); | |
1151 | header.grain_offset = | |
1152 | ((header.gd_offset + gd_size + (gt_size * gt_count) + | |
1153 | header.granularity - 1) / header.granularity) * | |
1154 | header.granularity; | |
1155 | /* swap endianness for all header fields */ | |
1156 | header.version = cpu_to_le32(header.version); | |
1157 | header.flags = cpu_to_le32(header.flags); | |
1158 | header.capacity = cpu_to_le64(header.capacity); | |
1159 | header.granularity = cpu_to_le64(header.granularity); | |
1160 | header.num_gtes_per_gte = cpu_to_le32(header.num_gtes_per_gte); | |
1161 | header.desc_offset = cpu_to_le64(header.desc_offset); | |
1162 | header.desc_size = cpu_to_le64(header.desc_size); | |
1163 | header.rgd_offset = cpu_to_le64(header.rgd_offset); | |
1164 | header.gd_offset = cpu_to_le64(header.gd_offset); | |
1165 | header.grain_offset = cpu_to_le64(header.grain_offset); | |
1166 | header.compressAlgorithm = cpu_to_le16(header.compressAlgorithm); | |
1167 | ||
1168 | header.check_bytes[0] = 0xa; | |
1169 | header.check_bytes[1] = 0x20; | |
1170 | header.check_bytes[2] = 0xd; | |
1171 | header.check_bytes[3] = 0xa; | |
1172 | ||
1173 | /* write all the data */ | |
1174 | ret = qemu_write_full(fd, &magic, sizeof(magic)); | |
1175 | if (ret != sizeof(magic)) { | |
1176 | ret = -errno; | |
1177 | goto exit; | |
1178 | } | |
1179 | ret = qemu_write_full(fd, &header, sizeof(header)); | |
1180 | if (ret != sizeof(header)) { | |
1181 | ret = -errno; | |
1182 | goto exit; | |
1183 | } | |
1184 | ||
1185 | ret = ftruncate(fd, le64_to_cpu(header.grain_offset) << 9); | |
1186 | if (ret < 0) { | |
1187 | ret = -errno; | |
1188 | goto exit; | |
1189 | } | |
1190 | ||
1191 | /* write grain directory */ | |
1192 | lseek(fd, le64_to_cpu(header.rgd_offset) << 9, SEEK_SET); | |
1193 | for (i = 0, tmp = le64_to_cpu(header.rgd_offset) + gd_size; | |
1194 | i < gt_count; i++, tmp += gt_size) { | |
1195 | ret = qemu_write_full(fd, &tmp, sizeof(tmp)); | |
1196 | if (ret != sizeof(tmp)) { | |
1197 | ret = -errno; | |
1198 | goto exit; | |
1199 | } | |
1200 | } | |
1201 | ||
1202 | /* write backup grain directory */ | |
1203 | lseek(fd, le64_to_cpu(header.gd_offset) << 9, SEEK_SET); | |
1204 | for (i = 0, tmp = le64_to_cpu(header.gd_offset) + gd_size; | |
1205 | i < gt_count; i++, tmp += gt_size) { | |
1206 | ret = qemu_write_full(fd, &tmp, sizeof(tmp)); | |
1207 | if (ret != sizeof(tmp)) { | |
1208 | ret = -errno; | |
1209 | goto exit; | |
1210 | } | |
1211 | } | |
1212 | ||
1213 | ret = 0; | |
1214 | exit: | |
1215 | close(fd); | |
1216 | return ret; | |
1217 | } | |
1218 | ||
1219 | static int filename_decompose(const char *filename, char *path, char *prefix, | |
1220 | char *postfix, size_t buf_len) | |
1221 | { | |
1222 | const char *p, *q; | |
1223 | ||
1224 | if (filename == NULL || !strlen(filename)) { | |
1225 | fprintf(stderr, "Vmdk: no filename provided.\n"); | |
1226 | return -1; | |
1227 | } | |
1228 | p = strrchr(filename, '/'); | |
1229 | if (p == NULL) { | |
1230 | p = strrchr(filename, '\\'); | |
1231 | } | |
1232 | if (p == NULL) { | |
1233 | p = strrchr(filename, ':'); | |
1234 | } | |
1235 | if (p != NULL) { | |
1236 | p++; | |
1237 | if (p - filename >= buf_len) { | |
1238 | return -1; | |
1239 | } | |
1240 | pstrcpy(path, p - filename + 1, filename); | |
1241 | } else { | |
1242 | p = filename; | |
1243 | path[0] = '\0'; | |
1244 | } | |
1245 | q = strrchr(p, '.'); | |
1246 | if (q == NULL) { | |
1247 | pstrcpy(prefix, buf_len, p); | |
1248 | postfix[0] = '\0'; | |
1249 | } else { | |
1250 | if (q - p >= buf_len) { | |
1251 | return -1; | |
1252 | } | |
1253 | pstrcpy(prefix, q - p + 1, p); | |
1254 | pstrcpy(postfix, buf_len, q); | |
1255 | } | |
1256 | return 0; | |
1257 | } | |
1258 | ||
1259 | static int relative_path(char *dest, int dest_size, | |
1260 | const char *base, const char *target) | |
1261 | { | |
1262 | int i = 0; | |
1263 | int n = 0; | |
1264 | const char *p, *q; | |
1265 | #ifdef _WIN32 | |
1266 | const char *sep = "\\"; | |
1267 | #else | |
1268 | const char *sep = "/"; | |
1269 | #endif | |
1270 | ||
1271 | if (!(dest && base && target)) { | |
1272 | return -1; | |
1273 | } | |
1274 | if (path_is_absolute(target)) { | |
1275 | dest[dest_size - 1] = '\0'; | |
1276 | strncpy(dest, target, dest_size - 1); | |
1277 | return 0; | |
1278 | } | |
1279 | while (base[i] == target[i]) { | |
1280 | i++; | |
1281 | } | |
1282 | p = &base[i]; | |
1283 | q = &target[i]; | |
1284 | while (*p) { | |
1285 | if (*p == *sep) { | |
1286 | n++; | |
1287 | } | |
1288 | p++; | |
1289 | } | |
1290 | dest[0] = '\0'; | |
1291 | for (; n; n--) { | |
1292 | pstrcat(dest, dest_size, ".."); | |
1293 | pstrcat(dest, dest_size, sep); | |
1294 | } | |
1295 | pstrcat(dest, dest_size, q); | |
1296 | return 0; | |
1297 | } | |
1298 | ||
1299 | static int vmdk_create(const char *filename, QEMUOptionParameter *options) | |
1300 | { | |
1301 | int fd, idx = 0; | |
1302 | char desc[BUF_SIZE]; | |
1303 | int64_t total_size = 0, filesize; | |
1304 | const char *backing_file = NULL; | |
1305 | const char *fmt = NULL; | |
1306 | int flags = 0; | |
1307 | int ret = 0; | |
1308 | bool flat, split, compress; | |
1309 | char ext_desc_lines[BUF_SIZE] = ""; | |
1310 | char path[PATH_MAX], prefix[PATH_MAX], postfix[PATH_MAX]; | |
1311 | const int64_t split_size = 0x80000000; /* VMDK has constant split size */ | |
1312 | const char *desc_extent_line; | |
1313 | char parent_desc_line[BUF_SIZE] = ""; | |
1314 | uint32_t parent_cid = 0xffffffff; | |
1315 | const char desc_template[] = | |
1316 | "# Disk DescriptorFile\n" | |
1317 | "version=1\n" | |
1318 | "CID=%x\n" | |
1319 | "parentCID=%x\n" | |
1320 | "createType=\"%s\"\n" | |
1321 | "%s" | |
1322 | "\n" | |
1323 | "# Extent description\n" | |
1324 | "%s" | |
1325 | "\n" | |
1326 | "# The Disk Data Base\n" | |
1327 | "#DDB\n" | |
1328 | "\n" | |
1329 | "ddb.virtualHWVersion = \"%d\"\n" | |
1330 | "ddb.geometry.cylinders = \"%" PRId64 "\"\n" | |
1331 | "ddb.geometry.heads = \"16\"\n" | |
1332 | "ddb.geometry.sectors = \"63\"\n" | |
1333 | "ddb.adapterType = \"ide\"\n"; | |
1334 | ||
1335 | if (filename_decompose(filename, path, prefix, postfix, PATH_MAX)) { | |
1336 | return -EINVAL; | |
1337 | } | |
1338 | /* Read out options */ | |
1339 | while (options && options->name) { | |
1340 | if (!strcmp(options->name, BLOCK_OPT_SIZE)) { | |
1341 | total_size = options->value.n; | |
1342 | } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) { | |
1343 | backing_file = options->value.s; | |
1344 | } else if (!strcmp(options->name, BLOCK_OPT_COMPAT6)) { | |
1345 | flags |= options->value.n ? BLOCK_FLAG_COMPAT6 : 0; | |
1346 | } else if (!strcmp(options->name, BLOCK_OPT_SUBFMT)) { | |
1347 | fmt = options->value.s; | |
1348 | } | |
1349 | options++; | |
1350 | } | |
1351 | if (!fmt) { | |
1352 | /* Default format to monolithicSparse */ | |
1353 | fmt = "monolithicSparse"; | |
1354 | } else if (strcmp(fmt, "monolithicFlat") && | |
1355 | strcmp(fmt, "monolithicSparse") && | |
1356 | strcmp(fmt, "twoGbMaxExtentSparse") && | |
1357 | strcmp(fmt, "twoGbMaxExtentFlat") && | |
1358 | strcmp(fmt, "streamOptimized")) { | |
1359 | fprintf(stderr, "VMDK: Unknown subformat: %s\n", fmt); | |
1360 | return -EINVAL; | |
1361 | } | |
1362 | split = !(strcmp(fmt, "twoGbMaxExtentFlat") && | |
1363 | strcmp(fmt, "twoGbMaxExtentSparse")); | |
1364 | flat = !(strcmp(fmt, "monolithicFlat") && | |
1365 | strcmp(fmt, "twoGbMaxExtentFlat")); | |
1366 | compress = !strcmp(fmt, "streamOptimized"); | |
1367 | if (flat) { | |
1368 | desc_extent_line = "RW %lld FLAT \"%s\" 0\n"; | |
1369 | } else { | |
1370 | desc_extent_line = "RW %lld SPARSE \"%s\"\n"; | |
1371 | } | |
1372 | if (flat && backing_file) { | |
1373 | /* not supporting backing file for flat image */ | |
1374 | return -ENOTSUP; | |
1375 | } | |
1376 | if (backing_file) { | |
1377 | char parent_filename[PATH_MAX]; | |
1378 | BlockDriverState *bs = bdrv_new(""); | |
1379 | ret = bdrv_open(bs, backing_file, 0, NULL); | |
1380 | if (ret != 0) { | |
1381 | bdrv_delete(bs); | |
1382 | return ret; | |
1383 | } | |
1384 | if (strcmp(bs->drv->format_name, "vmdk")) { | |
1385 | bdrv_delete(bs); | |
1386 | return -EINVAL; | |
1387 | } | |
1388 | filesize = bdrv_getlength(bs); | |
1389 | parent_cid = vmdk_read_cid(bs, 0); | |
1390 | bdrv_delete(bs); | |
1391 | relative_path(parent_filename, sizeof(parent_filename), | |
1392 | filename, backing_file); | |
1393 | snprintf(parent_desc_line, sizeof(parent_desc_line), | |
1394 | "parentFileNameHint=\"%s\"", parent_filename); | |
1395 | } | |
1396 | ||
1397 | /* Create extents */ | |
1398 | filesize = total_size; | |
1399 | while (filesize > 0) { | |
1400 | char desc_line[BUF_SIZE]; | |
1401 | char ext_filename[PATH_MAX]; | |
1402 | char desc_filename[PATH_MAX]; | |
1403 | int64_t size = filesize; | |
1404 | ||
1405 | if (split && size > split_size) { | |
1406 | size = split_size; | |
1407 | } | |
1408 | if (split) { | |
1409 | snprintf(desc_filename, sizeof(desc_filename), "%s-%c%03d%s", | |
1410 | prefix, flat ? 'f' : 's', ++idx, postfix); | |
1411 | } else if (flat) { | |
1412 | snprintf(desc_filename, sizeof(desc_filename), "%s-flat%s", | |
1413 | prefix, postfix); | |
1414 | } else { | |
1415 | snprintf(desc_filename, sizeof(desc_filename), "%s%s", | |
1416 | prefix, postfix); | |
1417 | } | |
1418 | snprintf(ext_filename, sizeof(ext_filename), "%s%s", | |
1419 | path, desc_filename); | |
1420 | ||
1421 | if (vmdk_create_extent(ext_filename, size, flat, compress)) { | |
1422 | return -EINVAL; | |
1423 | } | |
1424 | filesize -= size; | |
1425 | ||
1426 | /* Format description line */ | |
1427 | snprintf(desc_line, sizeof(desc_line), | |
1428 | desc_extent_line, size / 512, desc_filename); | |
1429 | pstrcat(ext_desc_lines, sizeof(ext_desc_lines), desc_line); | |
1430 | } | |
1431 | /* generate descriptor file */ | |
1432 | snprintf(desc, sizeof(desc), desc_template, | |
1433 | (unsigned int)time(NULL), | |
1434 | parent_cid, | |
1435 | fmt, | |
1436 | parent_desc_line, | |
1437 | ext_desc_lines, | |
1438 | (flags & BLOCK_FLAG_COMPAT6 ? 6 : 4), | |
1439 | total_size / (int64_t)(63 * 16 * 512)); | |
1440 | if (split || flat) { | |
1441 | fd = open( | |
1442 | filename, | |
1443 | O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, | |
1444 | 0644); | |
1445 | } else { | |
1446 | fd = open( | |
1447 | filename, | |
1448 | O_WRONLY | O_BINARY | O_LARGEFILE, | |
1449 | 0644); | |
1450 | } | |
1451 | if (fd < 0) { | |
1452 | return -errno; | |
1453 | } | |
1454 | /* the descriptor offset = 0x200 */ | |
1455 | if (!split && !flat && 0x200 != lseek(fd, 0x200, SEEK_SET)) { | |
1456 | ret = -errno; | |
1457 | goto exit; | |
1458 | } | |
1459 | ret = qemu_write_full(fd, desc, strlen(desc)); | |
1460 | if (ret != strlen(desc)) { | |
1461 | ret = -errno; | |
1462 | goto exit; | |
1463 | } | |
1464 | ret = 0; | |
1465 | exit: | |
1466 | close(fd); | |
1467 | return ret; | |
1468 | } | |
1469 | ||
1470 | static void vmdk_close(BlockDriverState *bs) | |
1471 | { | |
1472 | vmdk_free_extents(bs); | |
1473 | } | |
1474 | ||
1475 | static int vmdk_flush(BlockDriverState *bs) | |
1476 | { | |
1477 | int i, ret, err; | |
1478 | BDRVVmdkState *s = bs->opaque; | |
1479 | ||
1480 | ret = bdrv_flush(bs->file); | |
1481 | for (i = 0; i < s->num_extents; i++) { | |
1482 | err = bdrv_flush(s->extents[i].file); | |
1483 | if (err < 0) { | |
1484 | ret = err; | |
1485 | } | |
1486 | } | |
1487 | return ret; | |
1488 | } | |
1489 | ||
1490 | static int64_t vmdk_get_allocated_file_size(BlockDriverState *bs) | |
1491 | { | |
1492 | int i; | |
1493 | int64_t ret = 0; | |
1494 | int64_t r; | |
1495 | BDRVVmdkState *s = bs->opaque; | |
1496 | ||
1497 | ret = bdrv_get_allocated_file_size(bs->file); | |
1498 | if (ret < 0) { | |
1499 | return ret; | |
1500 | } | |
1501 | for (i = 0; i < s->num_extents; i++) { | |
1502 | if (s->extents[i].file == bs->file) { | |
1503 | continue; | |
1504 | } | |
1505 | r = bdrv_get_allocated_file_size(s->extents[i].file); | |
1506 | if (r < 0) { | |
1507 | return r; | |
1508 | } | |
1509 | ret += r; | |
1510 | } | |
1511 | return ret; | |
1512 | } | |
1513 | ||
1514 | static QEMUOptionParameter vmdk_create_options[] = { | |
1515 | { | |
1516 | .name = BLOCK_OPT_SIZE, | |
1517 | .type = OPT_SIZE, | |
1518 | .help = "Virtual disk size" | |
1519 | }, | |
1520 | { | |
1521 | .name = BLOCK_OPT_BACKING_FILE, | |
1522 | .type = OPT_STRING, | |
1523 | .help = "File name of a base image" | |
1524 | }, | |
1525 | { | |
1526 | .name = BLOCK_OPT_COMPAT6, | |
1527 | .type = OPT_FLAG, | |
1528 | .help = "VMDK version 6 image" | |
1529 | }, | |
1530 | { | |
1531 | .name = BLOCK_OPT_SUBFMT, | |
1532 | .type = OPT_STRING, | |
1533 | .help = | |
1534 | "VMDK flat extent format, can be one of " | |
1535 | "{monolithicSparse (default) | monolithicFlat | twoGbMaxExtentSparse | twoGbMaxExtentFlat | streamOptimized} " | |
1536 | }, | |
1537 | { NULL } | |
1538 | }; | |
1539 | ||
1540 | static BlockDriver bdrv_vmdk = { | |
1541 | .format_name = "vmdk", | |
1542 | .instance_size = sizeof(BDRVVmdkState), | |
1543 | .bdrv_probe = vmdk_probe, | |
1544 | .bdrv_open = vmdk_open, | |
1545 | .bdrv_read = vmdk_read, | |
1546 | .bdrv_write = vmdk_write, | |
1547 | .bdrv_close = vmdk_close, | |
1548 | .bdrv_create = vmdk_create, | |
1549 | .bdrv_flush = vmdk_flush, | |
1550 | .bdrv_is_allocated = vmdk_is_allocated, | |
1551 | .bdrv_get_allocated_file_size = vmdk_get_allocated_file_size, | |
1552 | ||
1553 | .create_options = vmdk_create_options, | |
1554 | }; | |
1555 | ||
1556 | static void bdrv_vmdk_init(void) | |
1557 | { | |
1558 | bdrv_register(&bdrv_vmdk); | |
1559 | } | |
1560 | ||
1561 | block_init(bdrv_vmdk_init); |