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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 BDRVVmdkState { | |
64 | int64_t l1_table_offset; | |
65 | int64_t l1_backup_table_offset; | |
66 | uint32_t *l1_table; | |
67 | uint32_t *l1_backup_table; | |
68 | unsigned int l1_size; | |
69 | uint32_t l1_entry_sectors; | |
70 | ||
71 | unsigned int l2_size; | |
72 | uint32_t *l2_cache; | |
73 | uint32_t l2_cache_offsets[L2_CACHE_SIZE]; | |
74 | uint32_t l2_cache_counts[L2_CACHE_SIZE]; | |
75 | ||
76 | unsigned int cluster_sectors; | |
77 | uint32_t parent_cid; | |
78 | } BDRVVmdkState; | |
79 | ||
80 | typedef struct VmdkMetaData { | |
81 | uint32_t offset; | |
82 | unsigned int l1_index; | |
83 | unsigned int l2_index; | |
84 | unsigned int l2_offset; | |
85 | int valid; | |
86 | } VmdkMetaData; | |
87 | ||
88 | static int vmdk_probe(const uint8_t *buf, int buf_size, const char *filename) | |
89 | { | |
90 | uint32_t magic; | |
91 | ||
92 | if (buf_size < 4) | |
93 | return 0; | |
94 | magic = be32_to_cpu(*(uint32_t *)buf); | |
95 | if (magic == VMDK3_MAGIC || | |
96 | magic == VMDK4_MAGIC) | |
97 | return 100; | |
98 | else | |
99 | return 0; | |
100 | } | |
101 | ||
102 | #define CHECK_CID 1 | |
103 | ||
104 | #define SECTOR_SIZE 512 | |
105 | #define DESC_SIZE 20*SECTOR_SIZE // 20 sectors of 512 bytes each | |
106 | #define HEADER_SIZE 512 // first sector of 512 bytes | |
107 | ||
108 | static uint32_t vmdk_read_cid(BlockDriverState *bs, int parent) | |
109 | { | |
110 | char desc[DESC_SIZE]; | |
111 | uint32_t cid; | |
112 | const char *p_name, *cid_str; | |
113 | size_t cid_str_size; | |
114 | ||
115 | /* the descriptor offset = 0x200 */ | |
116 | if (bdrv_pread(bs->file, 0x200, desc, DESC_SIZE) != DESC_SIZE) | |
117 | return 0; | |
118 | ||
119 | if (parent) { | |
120 | cid_str = "parentCID"; | |
121 | cid_str_size = sizeof("parentCID"); | |
122 | } else { | |
123 | cid_str = "CID"; | |
124 | cid_str_size = sizeof("CID"); | |
125 | } | |
126 | ||
127 | if ((p_name = strstr(desc,cid_str)) != NULL) { | |
128 | p_name += cid_str_size; | |
129 | sscanf(p_name,"%x",&cid); | |
130 | } | |
131 | ||
132 | return cid; | |
133 | } | |
134 | ||
135 | static int vmdk_write_cid(BlockDriverState *bs, uint32_t cid) | |
136 | { | |
137 | char desc[DESC_SIZE], tmp_desc[DESC_SIZE]; | |
138 | char *p_name, *tmp_str; | |
139 | ||
140 | /* the descriptor offset = 0x200 */ | |
141 | if (bdrv_pread(bs->file, 0x200, desc, DESC_SIZE) != DESC_SIZE) | |
142 | return -1; | |
143 | ||
144 | tmp_str = strstr(desc,"parentCID"); | |
145 | pstrcpy(tmp_desc, sizeof(tmp_desc), tmp_str); | |
146 | if ((p_name = strstr(desc,"CID")) != NULL) { | |
147 | p_name += sizeof("CID"); | |
148 | snprintf(p_name, sizeof(desc) - (p_name - desc), "%x\n", cid); | |
149 | pstrcat(desc, sizeof(desc), tmp_desc); | |
150 | } | |
151 | ||
152 | if (bdrv_pwrite_sync(bs->file, 0x200, desc, DESC_SIZE) < 0) | |
153 | return -1; | |
154 | return 0; | |
155 | } | |
156 | ||
157 | static int vmdk_is_cid_valid(BlockDriverState *bs) | |
158 | { | |
159 | #ifdef CHECK_CID | |
160 | BDRVVmdkState *s = bs->opaque; | |
161 | BlockDriverState *p_bs = bs->backing_hd; | |
162 | uint32_t cur_pcid; | |
163 | ||
164 | if (p_bs) { | |
165 | cur_pcid = vmdk_read_cid(p_bs,0); | |
166 | if (s->parent_cid != cur_pcid) | |
167 | // CID not valid | |
168 | return 0; | |
169 | } | |
170 | #endif | |
171 | // CID valid | |
172 | return 1; | |
173 | } | |
174 | ||
175 | static int vmdk_snapshot_create(const char *filename, const char *backing_file) | |
176 | { | |
177 | int snp_fd, p_fd; | |
178 | int ret; | |
179 | uint32_t p_cid; | |
180 | char *p_name, *gd_buf, *rgd_buf; | |
181 | const char *real_filename, *temp_str; | |
182 | VMDK4Header header; | |
183 | uint32_t gde_entries, gd_size; | |
184 | int64_t gd_offset, rgd_offset, capacity, gt_size; | |
185 | char p_desc[DESC_SIZE], s_desc[DESC_SIZE], hdr[HEADER_SIZE]; | |
186 | static const char desc_template[] = | |
187 | "# Disk DescriptorFile\n" | |
188 | "version=1\n" | |
189 | "CID=%x\n" | |
190 | "parentCID=%x\n" | |
191 | "createType=\"monolithicSparse\"\n" | |
192 | "parentFileNameHint=\"%s\"\n" | |
193 | "\n" | |
194 | "# Extent description\n" | |
195 | "RW %u SPARSE \"%s\"\n" | |
196 | "\n" | |
197 | "# The Disk Data Base \n" | |
198 | "#DDB\n" | |
199 | "\n"; | |
200 | ||
201 | snp_fd = open(filename, O_RDWR | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, 0644); | |
202 | if (snp_fd < 0) | |
203 | return -errno; | |
204 | p_fd = open(backing_file, O_RDONLY | O_BINARY | O_LARGEFILE); | |
205 | if (p_fd < 0) { | |
206 | close(snp_fd); | |
207 | return -errno; | |
208 | } | |
209 | ||
210 | /* read the header */ | |
211 | if (lseek(p_fd, 0x0, SEEK_SET) == -1) { | |
212 | ret = -errno; | |
213 | goto fail; | |
214 | } | |
215 | if (read(p_fd, hdr, HEADER_SIZE) != HEADER_SIZE) { | |
216 | ret = -errno; | |
217 | goto fail; | |
218 | } | |
219 | ||
220 | /* write the header */ | |
221 | if (lseek(snp_fd, 0x0, SEEK_SET) == -1) { | |
222 | ret = -errno; | |
223 | goto fail; | |
224 | } | |
225 | if (write(snp_fd, hdr, HEADER_SIZE) == -1) { | |
226 | ret = -errno; | |
227 | goto fail; | |
228 | } | |
229 | ||
230 | memset(&header, 0, sizeof(header)); | |
231 | memcpy(&header,&hdr[4], sizeof(header)); // skip the VMDK4_MAGIC | |
232 | ||
233 | if (ftruncate(snp_fd, header.grain_offset << 9)) { | |
234 | ret = -errno; | |
235 | goto fail; | |
236 | } | |
237 | /* the descriptor offset = 0x200 */ | |
238 | if (lseek(p_fd, 0x200, SEEK_SET) == -1) { | |
239 | ret = -errno; | |
240 | goto fail; | |
241 | } | |
242 | if (read(p_fd, p_desc, DESC_SIZE) != DESC_SIZE) { | |
243 | ret = -errno; | |
244 | goto fail; | |
245 | } | |
246 | ||
247 | if ((p_name = strstr(p_desc,"CID")) != NULL) { | |
248 | p_name += sizeof("CID"); | |
249 | sscanf(p_name,"%x",&p_cid); | |
250 | } | |
251 | ||
252 | real_filename = filename; | |
253 | if ((temp_str = strrchr(real_filename, '\\')) != NULL) | |
254 | real_filename = temp_str + 1; | |
255 | if ((temp_str = strrchr(real_filename, '/')) != NULL) | |
256 | real_filename = temp_str + 1; | |
257 | if ((temp_str = strrchr(real_filename, ':')) != NULL) | |
258 | real_filename = temp_str + 1; | |
259 | ||
260 | snprintf(s_desc, sizeof(s_desc), desc_template, p_cid, p_cid, backing_file, | |
261 | (uint32_t)header.capacity, real_filename); | |
262 | ||
263 | /* write the descriptor */ | |
264 | if (lseek(snp_fd, 0x200, SEEK_SET) == -1) { | |
265 | ret = -errno; | |
266 | goto fail; | |
267 | } | |
268 | if (write(snp_fd, s_desc, strlen(s_desc)) == -1) { | |
269 | ret = -errno; | |
270 | goto fail; | |
271 | } | |
272 | ||
273 | gd_offset = header.gd_offset * SECTOR_SIZE; // offset of GD table | |
274 | rgd_offset = header.rgd_offset * SECTOR_SIZE; // offset of RGD table | |
275 | capacity = header.capacity * SECTOR_SIZE; // Extent size | |
276 | /* | |
277 | * Each GDE span 32M disk, means: | |
278 | * 512 GTE per GT, each GTE points to grain | |
279 | */ | |
280 | gt_size = (int64_t)header.num_gtes_per_gte * header.granularity * SECTOR_SIZE; | |
281 | if (!gt_size) { | |
282 | ret = -EINVAL; | |
283 | goto fail; | |
284 | } | |
285 | gde_entries = (uint32_t)(capacity / gt_size); // number of gde/rgde | |
286 | gd_size = gde_entries * sizeof(uint32_t); | |
287 | ||
288 | /* write RGD */ | |
289 | rgd_buf = qemu_malloc(gd_size); | |
290 | if (lseek(p_fd, rgd_offset, SEEK_SET) == -1) { | |
291 | ret = -errno; | |
292 | goto fail_rgd; | |
293 | } | |
294 | if (read(p_fd, rgd_buf, gd_size) != gd_size) { | |
295 | ret = -errno; | |
296 | goto fail_rgd; | |
297 | } | |
298 | if (lseek(snp_fd, rgd_offset, SEEK_SET) == -1) { | |
299 | ret = -errno; | |
300 | goto fail_rgd; | |
301 | } | |
302 | if (write(snp_fd, rgd_buf, gd_size) == -1) { | |
303 | ret = -errno; | |
304 | goto fail_rgd; | |
305 | } | |
306 | ||
307 | /* write GD */ | |
308 | gd_buf = qemu_malloc(gd_size); | |
309 | if (lseek(p_fd, gd_offset, SEEK_SET) == -1) { | |
310 | ret = -errno; | |
311 | goto fail_gd; | |
312 | } | |
313 | if (read(p_fd, gd_buf, gd_size) != gd_size) { | |
314 | ret = -errno; | |
315 | goto fail_gd; | |
316 | } | |
317 | if (lseek(snp_fd, gd_offset, SEEK_SET) == -1) { | |
318 | ret = -errno; | |
319 | goto fail_gd; | |
320 | } | |
321 | if (write(snp_fd, gd_buf, gd_size) == -1) { | |
322 | ret = -errno; | |
323 | goto fail_gd; | |
324 | } | |
325 | ret = 0; | |
326 | ||
327 | fail_gd: | |
328 | qemu_free(gd_buf); | |
329 | fail_rgd: | |
330 | qemu_free(rgd_buf); | |
331 | fail: | |
332 | close(p_fd); | |
333 | close(snp_fd); | |
334 | return ret; | |
335 | } | |
336 | ||
337 | static int vmdk_parent_open(BlockDriverState *bs) | |
338 | { | |
339 | char *p_name; | |
340 | char desc[DESC_SIZE]; | |
341 | ||
342 | /* the descriptor offset = 0x200 */ | |
343 | if (bdrv_pread(bs->file, 0x200, desc, DESC_SIZE) != DESC_SIZE) | |
344 | return -1; | |
345 | ||
346 | if ((p_name = strstr(desc,"parentFileNameHint")) != NULL) { | |
347 | char *end_name; | |
348 | ||
349 | p_name += sizeof("parentFileNameHint") + 1; | |
350 | if ((end_name = strchr(p_name,'\"')) == NULL) | |
351 | return -1; | |
352 | if ((end_name - p_name) > sizeof (bs->backing_file) - 1) | |
353 | return -1; | |
354 | ||
355 | pstrcpy(bs->backing_file, end_name - p_name + 1, p_name); | |
356 | } | |
357 | ||
358 | return 0; | |
359 | } | |
360 | ||
361 | static int vmdk_open(BlockDriverState *bs, int flags) | |
362 | { | |
363 | BDRVVmdkState *s = bs->opaque; | |
364 | uint32_t magic; | |
365 | int l1_size, i; | |
366 | ||
367 | if (bdrv_pread(bs->file, 0, &magic, sizeof(magic)) != sizeof(magic)) | |
368 | goto fail; | |
369 | ||
370 | magic = be32_to_cpu(magic); | |
371 | if (magic == VMDK3_MAGIC) { | |
372 | VMDK3Header header; | |
373 | ||
374 | if (bdrv_pread(bs->file, sizeof(magic), &header, sizeof(header)) != sizeof(header)) | |
375 | goto fail; | |
376 | s->cluster_sectors = le32_to_cpu(header.granularity); | |
377 | s->l2_size = 1 << 9; | |
378 | s->l1_size = 1 << 6; | |
379 | bs->total_sectors = le32_to_cpu(header.disk_sectors); | |
380 | s->l1_table_offset = le32_to_cpu(header.l1dir_offset) << 9; | |
381 | s->l1_backup_table_offset = 0; | |
382 | s->l1_entry_sectors = s->l2_size * s->cluster_sectors; | |
383 | } else if (magic == VMDK4_MAGIC) { | |
384 | VMDK4Header header; | |
385 | ||
386 | if (bdrv_pread(bs->file, sizeof(magic), &header, sizeof(header)) != sizeof(header)) | |
387 | goto fail; | |
388 | bs->total_sectors = le64_to_cpu(header.capacity); | |
389 | s->cluster_sectors = le64_to_cpu(header.granularity); | |
390 | s->l2_size = le32_to_cpu(header.num_gtes_per_gte); | |
391 | s->l1_entry_sectors = s->l2_size * s->cluster_sectors; | |
392 | if (s->l1_entry_sectors <= 0) | |
393 | goto fail; | |
394 | s->l1_size = (bs->total_sectors + s->l1_entry_sectors - 1) | |
395 | / s->l1_entry_sectors; | |
396 | s->l1_table_offset = le64_to_cpu(header.rgd_offset) << 9; | |
397 | s->l1_backup_table_offset = le64_to_cpu(header.gd_offset) << 9; | |
398 | ||
399 | // try to open parent images, if exist | |
400 | if (vmdk_parent_open(bs) != 0) | |
401 | goto fail; | |
402 | // write the CID once after the image creation | |
403 | s->parent_cid = vmdk_read_cid(bs,1); | |
404 | } else { | |
405 | goto fail; | |
406 | } | |
407 | ||
408 | /* read the L1 table */ | |
409 | l1_size = s->l1_size * sizeof(uint32_t); | |
410 | s->l1_table = qemu_malloc(l1_size); | |
411 | if (bdrv_pread(bs->file, s->l1_table_offset, s->l1_table, l1_size) != l1_size) | |
412 | goto fail; | |
413 | for(i = 0; i < s->l1_size; i++) { | |
414 | le32_to_cpus(&s->l1_table[i]); | |
415 | } | |
416 | ||
417 | if (s->l1_backup_table_offset) { | |
418 | s->l1_backup_table = qemu_malloc(l1_size); | |
419 | if (bdrv_pread(bs->file, s->l1_backup_table_offset, s->l1_backup_table, l1_size) != l1_size) | |
420 | goto fail; | |
421 | for(i = 0; i < s->l1_size; i++) { | |
422 | le32_to_cpus(&s->l1_backup_table[i]); | |
423 | } | |
424 | } | |
425 | ||
426 | s->l2_cache = qemu_malloc(s->l2_size * L2_CACHE_SIZE * sizeof(uint32_t)); | |
427 | return 0; | |
428 | fail: | |
429 | qemu_free(s->l1_backup_table); | |
430 | qemu_free(s->l1_table); | |
431 | qemu_free(s->l2_cache); | |
432 | return -1; | |
433 | } | |
434 | ||
435 | static uint64_t get_cluster_offset(BlockDriverState *bs, VmdkMetaData *m_data, | |
436 | uint64_t offset, int allocate); | |
437 | ||
438 | static int get_whole_cluster(BlockDriverState *bs, uint64_t cluster_offset, | |
439 | uint64_t offset, int allocate) | |
440 | { | |
441 | BDRVVmdkState *s = bs->opaque; | |
442 | uint8_t whole_grain[s->cluster_sectors*512]; // 128 sectors * 512 bytes each = grain size 64KB | |
443 | ||
444 | // we will be here if it's first write on non-exist grain(cluster). | |
445 | // try to read from parent image, if exist | |
446 | if (bs->backing_hd) { | |
447 | int ret; | |
448 | ||
449 | if (!vmdk_is_cid_valid(bs)) | |
450 | return -1; | |
451 | ||
452 | ret = bdrv_read(bs->backing_hd, offset >> 9, whole_grain, | |
453 | s->cluster_sectors); | |
454 | if (ret < 0) { | |
455 | return -1; | |
456 | } | |
457 | ||
458 | //Write grain only into the active image | |
459 | ret = bdrv_write(bs->file, cluster_offset, whole_grain, | |
460 | s->cluster_sectors); | |
461 | if (ret < 0) { | |
462 | return -1; | |
463 | } | |
464 | } | |
465 | return 0; | |
466 | } | |
467 | ||
468 | static int vmdk_L2update(BlockDriverState *bs, VmdkMetaData *m_data) | |
469 | { | |
470 | BDRVVmdkState *s = bs->opaque; | |
471 | ||
472 | /* update L2 table */ | |
473 | if (bdrv_pwrite_sync(bs->file, ((int64_t)m_data->l2_offset * 512) + (m_data->l2_index * sizeof(m_data->offset)), | |
474 | &(m_data->offset), sizeof(m_data->offset)) < 0) | |
475 | return -1; | |
476 | /* update backup L2 table */ | |
477 | if (s->l1_backup_table_offset != 0) { | |
478 | m_data->l2_offset = s->l1_backup_table[m_data->l1_index]; | |
479 | if (bdrv_pwrite_sync(bs->file, ((int64_t)m_data->l2_offset * 512) + (m_data->l2_index * sizeof(m_data->offset)), | |
480 | &(m_data->offset), sizeof(m_data->offset)) < 0) | |
481 | return -1; | |
482 | } | |
483 | ||
484 | return 0; | |
485 | } | |
486 | ||
487 | static uint64_t get_cluster_offset(BlockDriverState *bs, VmdkMetaData *m_data, | |
488 | uint64_t offset, int allocate) | |
489 | { | |
490 | BDRVVmdkState *s = bs->opaque; | |
491 | unsigned int l1_index, l2_offset, l2_index; | |
492 | int min_index, i, j; | |
493 | uint32_t min_count, *l2_table, tmp = 0; | |
494 | uint64_t cluster_offset; | |
495 | ||
496 | if (m_data) | |
497 | m_data->valid = 0; | |
498 | ||
499 | l1_index = (offset >> 9) / s->l1_entry_sectors; | |
500 | if (l1_index >= s->l1_size) | |
501 | return 0; | |
502 | l2_offset = s->l1_table[l1_index]; | |
503 | if (!l2_offset) | |
504 | return 0; | |
505 | for(i = 0; i < L2_CACHE_SIZE; i++) { | |
506 | if (l2_offset == s->l2_cache_offsets[i]) { | |
507 | /* increment the hit count */ | |
508 | if (++s->l2_cache_counts[i] == 0xffffffff) { | |
509 | for(j = 0; j < L2_CACHE_SIZE; j++) { | |
510 | s->l2_cache_counts[j] >>= 1; | |
511 | } | |
512 | } | |
513 | l2_table = s->l2_cache + (i * s->l2_size); | |
514 | goto found; | |
515 | } | |
516 | } | |
517 | /* not found: load a new entry in the least used one */ | |
518 | min_index = 0; | |
519 | min_count = 0xffffffff; | |
520 | for(i = 0; i < L2_CACHE_SIZE; i++) { | |
521 | if (s->l2_cache_counts[i] < min_count) { | |
522 | min_count = s->l2_cache_counts[i]; | |
523 | min_index = i; | |
524 | } | |
525 | } | |
526 | l2_table = s->l2_cache + (min_index * s->l2_size); | |
527 | if (bdrv_pread(bs->file, (int64_t)l2_offset * 512, l2_table, s->l2_size * sizeof(uint32_t)) != | |
528 | s->l2_size * sizeof(uint32_t)) | |
529 | return 0; | |
530 | ||
531 | s->l2_cache_offsets[min_index] = l2_offset; | |
532 | s->l2_cache_counts[min_index] = 1; | |
533 | found: | |
534 | l2_index = ((offset >> 9) / s->cluster_sectors) % s->l2_size; | |
535 | cluster_offset = le32_to_cpu(l2_table[l2_index]); | |
536 | ||
537 | if (!cluster_offset) { | |
538 | if (!allocate) | |
539 | return 0; | |
540 | ||
541 | // Avoid the L2 tables update for the images that have snapshots. | |
542 | cluster_offset = bdrv_getlength(bs->file); | |
543 | bdrv_truncate(bs->file, cluster_offset + (s->cluster_sectors << 9)); | |
544 | ||
545 | cluster_offset >>= 9; | |
546 | tmp = cpu_to_le32(cluster_offset); | |
547 | l2_table[l2_index] = tmp; | |
548 | ||
549 | /* First of all we write grain itself, to avoid race condition | |
550 | * that may to corrupt the image. | |
551 | * This problem may occur because of insufficient space on host disk | |
552 | * or inappropriate VM shutdown. | |
553 | */ | |
554 | if (get_whole_cluster(bs, cluster_offset, offset, allocate) == -1) | |
555 | return 0; | |
556 | ||
557 | if (m_data) { | |
558 | m_data->offset = tmp; | |
559 | m_data->l1_index = l1_index; | |
560 | m_data->l2_index = l2_index; | |
561 | m_data->l2_offset = l2_offset; | |
562 | m_data->valid = 1; | |
563 | } | |
564 | } | |
565 | cluster_offset <<= 9; | |
566 | return cluster_offset; | |
567 | } | |
568 | ||
569 | static int vmdk_is_allocated(BlockDriverState *bs, int64_t sector_num, | |
570 | int nb_sectors, int *pnum) | |
571 | { | |
572 | BDRVVmdkState *s = bs->opaque; | |
573 | int index_in_cluster, n; | |
574 | uint64_t cluster_offset; | |
575 | ||
576 | cluster_offset = get_cluster_offset(bs, NULL, sector_num << 9, 0); | |
577 | index_in_cluster = sector_num % s->cluster_sectors; | |
578 | n = s->cluster_sectors - index_in_cluster; | |
579 | if (n > nb_sectors) | |
580 | n = nb_sectors; | |
581 | *pnum = n; | |
582 | return (cluster_offset != 0); | |
583 | } | |
584 | ||
585 | static int vmdk_read(BlockDriverState *bs, int64_t sector_num, | |
586 | uint8_t *buf, int nb_sectors) | |
587 | { | |
588 | BDRVVmdkState *s = bs->opaque; | |
589 | int index_in_cluster, n, ret; | |
590 | uint64_t cluster_offset; | |
591 | ||
592 | while (nb_sectors > 0) { | |
593 | cluster_offset = get_cluster_offset(bs, NULL, sector_num << 9, 0); | |
594 | index_in_cluster = sector_num % s->cluster_sectors; | |
595 | n = s->cluster_sectors - index_in_cluster; | |
596 | if (n > nb_sectors) | |
597 | n = nb_sectors; | |
598 | if (!cluster_offset) { | |
599 | // try to read from parent image, if exist | |
600 | if (bs->backing_hd) { | |
601 | if (!vmdk_is_cid_valid(bs)) | |
602 | return -1; | |
603 | ret = bdrv_read(bs->backing_hd, sector_num, buf, n); | |
604 | if (ret < 0) | |
605 | return -1; | |
606 | } else { | |
607 | memset(buf, 0, 512 * n); | |
608 | } | |
609 | } else { | |
610 | if(bdrv_pread(bs->file, cluster_offset + index_in_cluster * 512, buf, n * 512) != n * 512) | |
611 | return -1; | |
612 | } | |
613 | nb_sectors -= n; | |
614 | sector_num += n; | |
615 | buf += n * 512; | |
616 | } | |
617 | return 0; | |
618 | } | |
619 | ||
620 | static int vmdk_write(BlockDriverState *bs, int64_t sector_num, | |
621 | const uint8_t *buf, int nb_sectors) | |
622 | { | |
623 | BDRVVmdkState *s = bs->opaque; | |
624 | VmdkMetaData m_data; | |
625 | int index_in_cluster, n; | |
626 | uint64_t cluster_offset; | |
627 | static int cid_update = 0; | |
628 | ||
629 | if (sector_num > bs->total_sectors) { | |
630 | fprintf(stderr, | |
631 | "(VMDK) Wrong offset: sector_num=0x%" PRIx64 | |
632 | " total_sectors=0x%" PRIx64 "\n", | |
633 | sector_num, bs->total_sectors); | |
634 | return -1; | |
635 | } | |
636 | ||
637 | while (nb_sectors > 0) { | |
638 | index_in_cluster = sector_num & (s->cluster_sectors - 1); | |
639 | n = s->cluster_sectors - index_in_cluster; | |
640 | if (n > nb_sectors) | |
641 | n = nb_sectors; | |
642 | cluster_offset = get_cluster_offset(bs, &m_data, sector_num << 9, 1); | |
643 | if (!cluster_offset) | |
644 | return -1; | |
645 | ||
646 | if (bdrv_pwrite(bs->file, cluster_offset + index_in_cluster * 512, buf, n * 512) != n * 512) | |
647 | return -1; | |
648 | if (m_data.valid) { | |
649 | /* update L2 tables */ | |
650 | if (vmdk_L2update(bs, &m_data) == -1) | |
651 | return -1; | |
652 | } | |
653 | nb_sectors -= n; | |
654 | sector_num += n; | |
655 | buf += n * 512; | |
656 | ||
657 | // update CID on the first write every time the virtual disk is opened | |
658 | if (!cid_update) { | |
659 | vmdk_write_cid(bs, time(NULL)); | |
660 | cid_update++; | |
661 | } | |
662 | } | |
663 | return 0; | |
664 | } | |
665 | ||
666 | static int vmdk_create(const char *filename, QEMUOptionParameter *options) | |
667 | { | |
668 | int fd, i; | |
669 | VMDK4Header header; | |
670 | uint32_t tmp, magic, grains, gd_size, gt_size, gt_count; | |
671 | static const char desc_template[] = | |
672 | "# Disk DescriptorFile\n" | |
673 | "version=1\n" | |
674 | "CID=%x\n" | |
675 | "parentCID=ffffffff\n" | |
676 | "createType=\"monolithicSparse\"\n" | |
677 | "\n" | |
678 | "# Extent description\n" | |
679 | "RW %" PRId64 " SPARSE \"%s\"\n" | |
680 | "\n" | |
681 | "# The Disk Data Base \n" | |
682 | "#DDB\n" | |
683 | "\n" | |
684 | "ddb.virtualHWVersion = \"%d\"\n" | |
685 | "ddb.geometry.cylinders = \"%" PRId64 "\"\n" | |
686 | "ddb.geometry.heads = \"16\"\n" | |
687 | "ddb.geometry.sectors = \"63\"\n" | |
688 | "ddb.adapterType = \"ide\"\n"; | |
689 | char desc[1024]; | |
690 | const char *real_filename, *temp_str; | |
691 | int64_t total_size = 0; | |
692 | const char *backing_file = NULL; | |
693 | int flags = 0; | |
694 | int ret; | |
695 | ||
696 | // Read out options | |
697 | while (options && options->name) { | |
698 | if (!strcmp(options->name, BLOCK_OPT_SIZE)) { | |
699 | total_size = options->value.n / 512; | |
700 | } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) { | |
701 | backing_file = options->value.s; | |
702 | } else if (!strcmp(options->name, BLOCK_OPT_COMPAT6)) { | |
703 | flags |= options->value.n ? BLOCK_FLAG_COMPAT6: 0; | |
704 | } | |
705 | options++; | |
706 | } | |
707 | ||
708 | /* XXX: add support for backing file */ | |
709 | if (backing_file) { | |
710 | return vmdk_snapshot_create(filename, backing_file); | |
711 | } | |
712 | ||
713 | fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, | |
714 | 0644); | |
715 | if (fd < 0) | |
716 | return -errno; | |
717 | magic = cpu_to_be32(VMDK4_MAGIC); | |
718 | memset(&header, 0, sizeof(header)); | |
719 | header.version = cpu_to_le32(1); | |
720 | header.flags = cpu_to_le32(3); /* ?? */ | |
721 | header.capacity = cpu_to_le64(total_size); | |
722 | header.granularity = cpu_to_le64(128); | |
723 | header.num_gtes_per_gte = cpu_to_le32(512); | |
724 | ||
725 | grains = (total_size + header.granularity - 1) / header.granularity; | |
726 | gt_size = ((header.num_gtes_per_gte * sizeof(uint32_t)) + 511) >> 9; | |
727 | gt_count = (grains + header.num_gtes_per_gte - 1) / header.num_gtes_per_gte; | |
728 | gd_size = (gt_count * sizeof(uint32_t) + 511) >> 9; | |
729 | ||
730 | header.desc_offset = 1; | |
731 | header.desc_size = 20; | |
732 | header.rgd_offset = header.desc_offset + header.desc_size; | |
733 | header.gd_offset = header.rgd_offset + gd_size + (gt_size * gt_count); | |
734 | header.grain_offset = | |
735 | ((header.gd_offset + gd_size + (gt_size * gt_count) + | |
736 | header.granularity - 1) / header.granularity) * | |
737 | header.granularity; | |
738 | ||
739 | header.desc_offset = cpu_to_le64(header.desc_offset); | |
740 | header.desc_size = cpu_to_le64(header.desc_size); | |
741 | header.rgd_offset = cpu_to_le64(header.rgd_offset); | |
742 | header.gd_offset = cpu_to_le64(header.gd_offset); | |
743 | header.grain_offset = cpu_to_le64(header.grain_offset); | |
744 | ||
745 | header.check_bytes[0] = 0xa; | |
746 | header.check_bytes[1] = 0x20; | |
747 | header.check_bytes[2] = 0xd; | |
748 | header.check_bytes[3] = 0xa; | |
749 | ||
750 | /* write all the data */ | |
751 | ret = qemu_write_full(fd, &magic, sizeof(magic)); | |
752 | if (ret != sizeof(magic)) { | |
753 | ret = -errno; | |
754 | goto exit; | |
755 | } | |
756 | ret = qemu_write_full(fd, &header, sizeof(header)); | |
757 | if (ret != sizeof(header)) { | |
758 | ret = -errno; | |
759 | goto exit; | |
760 | } | |
761 | ||
762 | ret = ftruncate(fd, header.grain_offset << 9); | |
763 | if (ret < 0) { | |
764 | ret = -errno; | |
765 | goto exit; | |
766 | } | |
767 | ||
768 | /* write grain directory */ | |
769 | lseek(fd, le64_to_cpu(header.rgd_offset) << 9, SEEK_SET); | |
770 | for (i = 0, tmp = header.rgd_offset + gd_size; | |
771 | i < gt_count; i++, tmp += gt_size) { | |
772 | ret = qemu_write_full(fd, &tmp, sizeof(tmp)); | |
773 | if (ret != sizeof(tmp)) { | |
774 | ret = -errno; | |
775 | goto exit; | |
776 | } | |
777 | } | |
778 | ||
779 | /* write backup grain directory */ | |
780 | lseek(fd, le64_to_cpu(header.gd_offset) << 9, SEEK_SET); | |
781 | for (i = 0, tmp = header.gd_offset + gd_size; | |
782 | i < gt_count; i++, tmp += gt_size) { | |
783 | ret = qemu_write_full(fd, &tmp, sizeof(tmp)); | |
784 | if (ret != sizeof(tmp)) { | |
785 | ret = -errno; | |
786 | goto exit; | |
787 | } | |
788 | } | |
789 | ||
790 | /* compose the descriptor */ | |
791 | real_filename = filename; | |
792 | if ((temp_str = strrchr(real_filename, '\\')) != NULL) | |
793 | real_filename = temp_str + 1; | |
794 | if ((temp_str = strrchr(real_filename, '/')) != NULL) | |
795 | real_filename = temp_str + 1; | |
796 | if ((temp_str = strrchr(real_filename, ':')) != NULL) | |
797 | real_filename = temp_str + 1; | |
798 | snprintf(desc, sizeof(desc), desc_template, (unsigned int)time(NULL), | |
799 | total_size, real_filename, | |
800 | (flags & BLOCK_FLAG_COMPAT6 ? 6 : 4), | |
801 | total_size / (int64_t)(63 * 16)); | |
802 | ||
803 | /* write the descriptor */ | |
804 | lseek(fd, le64_to_cpu(header.desc_offset) << 9, SEEK_SET); | |
805 | ret = qemu_write_full(fd, desc, strlen(desc)); | |
806 | if (ret != strlen(desc)) { | |
807 | ret = -errno; | |
808 | goto exit; | |
809 | } | |
810 | ||
811 | ret = 0; | |
812 | exit: | |
813 | close(fd); | |
814 | return ret; | |
815 | } | |
816 | ||
817 | static void vmdk_close(BlockDriverState *bs) | |
818 | { | |
819 | BDRVVmdkState *s = bs->opaque; | |
820 | ||
821 | qemu_free(s->l1_table); | |
822 | qemu_free(s->l2_cache); | |
823 | } | |
824 | ||
825 | static int vmdk_flush(BlockDriverState *bs) | |
826 | { | |
827 | return bdrv_flush(bs->file); | |
828 | } | |
829 | ||
830 | ||
831 | static QEMUOptionParameter vmdk_create_options[] = { | |
832 | { | |
833 | .name = BLOCK_OPT_SIZE, | |
834 | .type = OPT_SIZE, | |
835 | .help = "Virtual disk size" | |
836 | }, | |
837 | { | |
838 | .name = BLOCK_OPT_BACKING_FILE, | |
839 | .type = OPT_STRING, | |
840 | .help = "File name of a base image" | |
841 | }, | |
842 | { | |
843 | .name = BLOCK_OPT_COMPAT6, | |
844 | .type = OPT_FLAG, | |
845 | .help = "VMDK version 6 image" | |
846 | }, | |
847 | { NULL } | |
848 | }; | |
849 | ||
850 | static BlockDriver bdrv_vmdk = { | |
851 | .format_name = "vmdk", | |
852 | .instance_size = sizeof(BDRVVmdkState), | |
853 | .bdrv_probe = vmdk_probe, | |
854 | .bdrv_open = vmdk_open, | |
855 | .bdrv_read = vmdk_read, | |
856 | .bdrv_write = vmdk_write, | |
857 | .bdrv_close = vmdk_close, | |
858 | .bdrv_create = vmdk_create, | |
859 | .bdrv_flush = vmdk_flush, | |
860 | .bdrv_is_allocated = vmdk_is_allocated, | |
861 | ||
862 | .create_options = vmdk_create_options, | |
863 | }; | |
864 | ||
865 | static void bdrv_vmdk_init(void) | |
866 | { | |
867 | bdrv_register(&bdrv_vmdk); | |
868 | } | |
869 | ||
870 | block_init(bdrv_vmdk_init); |