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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 "vl.h" | |
27 | #include "block_int.h" | |
28 | ||
29 | #define VMDK3_MAGIC (('C' << 24) | ('O' << 16) | ('W' << 8) | 'D') | |
30 | #define VMDK4_MAGIC (('K' << 24) | ('D' << 16) | ('M' << 8) | 'V') | |
31 | ||
32 | typedef struct { | |
33 | uint32_t version; | |
34 | uint32_t flags; | |
35 | uint32_t disk_sectors; | |
36 | uint32_t granularity; | |
37 | uint32_t l1dir_offset; | |
38 | uint32_t l1dir_size; | |
39 | uint32_t file_sectors; | |
40 | uint32_t cylinders; | |
41 | uint32_t heads; | |
42 | uint32_t sectors_per_track; | |
43 | } VMDK3Header; | |
44 | ||
45 | typedef struct { | |
46 | uint32_t version; | |
47 | uint32_t flags; | |
48 | int64_t capacity; | |
49 | int64_t granularity; | |
50 | int64_t desc_offset; | |
51 | int64_t desc_size; | |
52 | int32_t num_gtes_per_gte; | |
53 | int64_t rgd_offset; | |
54 | int64_t gd_offset; | |
55 | int64_t grain_offset; | |
56 | char filler[1]; | |
57 | char check_bytes[4]; | |
58 | } __attribute__((packed)) VMDK4Header; | |
59 | ||
60 | #define L2_CACHE_SIZE 16 | |
61 | ||
62 | typedef struct BDRVVmdkState { | |
63 | BlockDriverState *hd; | |
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 | int is_parent; | |
79 | } BDRVVmdkState; | |
80 | ||
81 | typedef struct VmdkMetaData { | |
82 | uint32_t offset; | |
83 | unsigned int l1_index; | |
84 | unsigned int l2_index; | |
85 | unsigned int l2_offset; | |
86 | int valid; | |
87 | } VmdkMetaData; | |
88 | ||
89 | typedef struct ActiveBDRVState{ | |
90 | BlockDriverState *hd; // active image handler | |
91 | uint64_t cluster_offset; // current write offset | |
92 | }ActiveBDRVState; | |
93 | ||
94 | static ActiveBDRVState activeBDRV; | |
95 | ||
96 | ||
97 | static int vmdk_probe(const uint8_t *buf, int buf_size, const char *filename) | |
98 | { | |
99 | uint32_t magic; | |
100 | ||
101 | if (buf_size < 4) | |
102 | return 0; | |
103 | magic = be32_to_cpu(*(uint32_t *)buf); | |
104 | if (magic == VMDK3_MAGIC || | |
105 | magic == VMDK4_MAGIC) | |
106 | return 100; | |
107 | else | |
108 | return 0; | |
109 | } | |
110 | ||
111 | #define CHECK_CID 1 | |
112 | ||
113 | #define SECTOR_SIZE 512 | |
114 | #define DESC_SIZE 20*SECTOR_SIZE // 20 sectors of 512 bytes each | |
115 | #define HEADER_SIZE 512 // first sector of 512 bytes | |
116 | ||
117 | static uint32_t vmdk_read_cid(BlockDriverState *bs, int parent) | |
118 | { | |
119 | BDRVVmdkState *s = bs->opaque; | |
120 | char desc[DESC_SIZE]; | |
121 | uint32_t cid; | |
122 | char *p_name, *cid_str; | |
123 | size_t cid_str_size; | |
124 | ||
125 | /* the descriptor offset = 0x200 */ | |
126 | if (bdrv_pread(s->hd, 0x200, desc, DESC_SIZE) != DESC_SIZE) | |
127 | return 0; | |
128 | ||
129 | if (parent) { | |
130 | cid_str = "parentCID"; | |
131 | cid_str_size = sizeof("parentCID"); | |
132 | } else { | |
133 | cid_str = "CID"; | |
134 | cid_str_size = sizeof("CID"); | |
135 | } | |
136 | ||
137 | if ((p_name = strstr(desc,cid_str)) != 0) { | |
138 | p_name += cid_str_size; | |
139 | sscanf(p_name,"%x",&cid); | |
140 | } | |
141 | ||
142 | return cid; | |
143 | } | |
144 | ||
145 | static int vmdk_write_cid(BlockDriverState *bs, uint32_t cid) | |
146 | { | |
147 | BDRVVmdkState *s = bs->opaque; | |
148 | char desc[DESC_SIZE], tmp_desc[DESC_SIZE]; | |
149 | char *p_name, *tmp_str; | |
150 | ||
151 | /* the descriptor offset = 0x200 */ | |
152 | if (bdrv_pread(s->hd, 0x200, desc, DESC_SIZE) != DESC_SIZE) | |
153 | return -1; | |
154 | ||
155 | tmp_str = strstr(desc,"parentCID"); | |
156 | strcpy(tmp_desc, tmp_str); | |
157 | if ((p_name = strstr(desc,"CID")) != 0) { | |
158 | p_name += sizeof("CID"); | |
159 | sprintf(p_name,"%x\n",cid); | |
160 | strcat(desc,tmp_desc); | |
161 | } | |
162 | ||
163 | if (bdrv_pwrite(s->hd, 0x200, desc, DESC_SIZE) != DESC_SIZE) | |
164 | return -1; | |
165 | return 0; | |
166 | } | |
167 | ||
168 | static int vmdk_is_cid_valid(BlockDriverState *bs) | |
169 | { | |
170 | #ifdef CHECK_CID | |
171 | BDRVVmdkState *s = bs->opaque; | |
172 | BlockDriverState *p_bs = s->hd->backing_hd; | |
173 | uint32_t cur_pcid; | |
174 | ||
175 | if (p_bs) { | |
176 | cur_pcid = vmdk_read_cid(p_bs,0); | |
177 | if (s->parent_cid != cur_pcid) | |
178 | // CID not valid | |
179 | return 0; | |
180 | } | |
181 | #endif | |
182 | // CID valid | |
183 | return 1; | |
184 | } | |
185 | ||
186 | static int vmdk_snapshot_create(const char *filename, const char *backing_file) | |
187 | { | |
188 | int snp_fd, p_fd; | |
189 | uint32_t p_cid; | |
190 | char *p_name, *gd_buf, *rgd_buf; | |
191 | const char *real_filename, *temp_str; | |
192 | VMDK4Header header; | |
193 | uint32_t gde_entries, gd_size; | |
194 | int64_t gd_offset, rgd_offset, capacity, gt_size; | |
195 | char p_desc[DESC_SIZE], s_desc[DESC_SIZE], hdr[HEADER_SIZE]; | |
196 | char *desc_template = | |
197 | "# Disk DescriptorFile\n" | |
198 | "version=1\n" | |
199 | "CID=%x\n" | |
200 | "parentCID=%x\n" | |
201 | "createType=\"monolithicSparse\"\n" | |
202 | "parentFileNameHint=\"%s\"\n" | |
203 | "\n" | |
204 | "# Extent description\n" | |
205 | "RW %lu SPARSE \"%s\"\n" | |
206 | "\n" | |
207 | "# The Disk Data Base \n" | |
208 | "#DDB\n" | |
209 | "\n"; | |
210 | ||
211 | snp_fd = open(filename, O_RDWR | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, 0644); | |
212 | if (snp_fd < 0) | |
213 | return -1; | |
214 | p_fd = open(backing_file, O_RDONLY | O_BINARY | O_LARGEFILE); | |
215 | if (p_fd < 0) { | |
216 | close(snp_fd); | |
217 | return -1; | |
218 | } | |
219 | ||
220 | /* read the header */ | |
221 | if (lseek(p_fd, 0x0, SEEK_SET) == -1) | |
222 | goto fail; | |
223 | if (read(p_fd, hdr, HEADER_SIZE) != HEADER_SIZE) | |
224 | goto fail; | |
225 | ||
226 | /* write the header */ | |
227 | if (lseek(snp_fd, 0x0, SEEK_SET) == -1) | |
228 | goto fail; | |
229 | if (write(snp_fd, hdr, HEADER_SIZE) == -1) | |
230 | goto fail; | |
231 | ||
232 | memset(&header, 0, sizeof(header)); | |
233 | memcpy(&header,&hdr[4], sizeof(header)); // skip the VMDK4_MAGIC | |
234 | ||
235 | ftruncate(snp_fd, header.grain_offset << 9); | |
236 | /* the descriptor offset = 0x200 */ | |
237 | if (lseek(p_fd, 0x200, SEEK_SET) == -1) | |
238 | goto fail; | |
239 | if (read(p_fd, p_desc, DESC_SIZE) != DESC_SIZE) | |
240 | goto fail; | |
241 | ||
242 | if ((p_name = strstr(p_desc,"CID")) != 0) { | |
243 | p_name += sizeof("CID"); | |
244 | sscanf(p_name,"%x",&p_cid); | |
245 | } | |
246 | ||
247 | real_filename = filename; | |
248 | if ((temp_str = strrchr(real_filename, '\\')) != NULL) | |
249 | real_filename = temp_str + 1; | |
250 | if ((temp_str = strrchr(real_filename, '/')) != NULL) | |
251 | real_filename = temp_str + 1; | |
252 | if ((temp_str = strrchr(real_filename, ':')) != NULL) | |
253 | real_filename = temp_str + 1; | |
254 | ||
255 | sprintf(s_desc, desc_template, p_cid, p_cid, backing_file | |
256 | , (uint32_t)header.capacity, real_filename); | |
257 | ||
258 | /* write the descriptor */ | |
259 | if (lseek(snp_fd, 0x200, SEEK_SET) == -1) | |
260 | goto fail; | |
261 | if (write(snp_fd, s_desc, strlen(s_desc)) == -1) | |
262 | goto fail; | |
263 | ||
264 | gd_offset = header.gd_offset * SECTOR_SIZE; // offset of GD table | |
265 | rgd_offset = header.rgd_offset * SECTOR_SIZE; // offset of RGD table | |
266 | capacity = header.capacity * SECTOR_SIZE; // Extent size | |
267 | /* | |
268 | * Each GDE span 32M disk, means: | |
269 | * 512 GTE per GT, each GTE points to grain | |
270 | */ | |
271 | gt_size = (int64_t)header.num_gtes_per_gte * header.granularity * SECTOR_SIZE; | |
272 | if (!gt_size) | |
273 | goto fail; | |
274 | gde_entries = (uint32_t)(capacity / gt_size); // number of gde/rgde | |
275 | gd_size = gde_entries * sizeof(uint32_t); | |
276 | ||
277 | /* write RGD */ | |
278 | rgd_buf = qemu_malloc(gd_size); | |
279 | if (!rgd_buf) | |
280 | goto fail; | |
281 | if (lseek(p_fd, rgd_offset, SEEK_SET) == -1) | |
282 | goto fail_rgd; | |
283 | if (read(p_fd, rgd_buf, gd_size) != gd_size) | |
284 | goto fail_rgd; | |
285 | if (lseek(snp_fd, rgd_offset, SEEK_SET) == -1) | |
286 | goto fail_rgd; | |
287 | if (write(snp_fd, rgd_buf, gd_size) == -1) | |
288 | goto fail_rgd; | |
289 | qemu_free(rgd_buf); | |
290 | ||
291 | /* write GD */ | |
292 | gd_buf = qemu_malloc(gd_size); | |
293 | if (!gd_buf) | |
294 | goto fail_rgd; | |
295 | if (lseek(p_fd, gd_offset, SEEK_SET) == -1) | |
296 | goto fail_gd; | |
297 | if (read(p_fd, gd_buf, gd_size) != gd_size) | |
298 | goto fail_gd; | |
299 | if (lseek(snp_fd, gd_offset, SEEK_SET) == -1) | |
300 | goto fail_gd; | |
301 | if (write(snp_fd, gd_buf, gd_size) == -1) | |
302 | goto fail_gd; | |
303 | qemu_free(gd_buf); | |
304 | ||
305 | close(p_fd); | |
306 | close(snp_fd); | |
307 | return 0; | |
308 | ||
309 | fail_gd: | |
310 | qemu_free(gd_buf); | |
311 | fail_rgd: | |
312 | qemu_free(rgd_buf); | |
313 | fail: | |
314 | close(p_fd); | |
315 | close(snp_fd); | |
316 | return -1; | |
317 | } | |
318 | ||
319 | static void vmdk_parent_close(BlockDriverState *bs) | |
320 | { | |
321 | if (bs->backing_hd) | |
322 | bdrv_close(bs->backing_hd); | |
323 | } | |
324 | ||
325 | int parent_open = 0; | |
326 | static int vmdk_parent_open(BlockDriverState *bs, const char * filename) | |
327 | { | |
328 | BDRVVmdkState *s = bs->opaque; | |
329 | char *p_name; | |
330 | char desc[DESC_SIZE]; | |
331 | char parent_img_name[1024]; | |
332 | ||
333 | /* the descriptor offset = 0x200 */ | |
334 | if (bdrv_pread(s->hd, 0x200, desc, DESC_SIZE) != DESC_SIZE) | |
335 | return -1; | |
336 | ||
337 | if ((p_name = strstr(desc,"parentFileNameHint")) != 0) { | |
338 | char *end_name; | |
339 | struct stat file_buf; | |
340 | ||
341 | p_name += sizeof("parentFileNameHint") + 1; | |
342 | if ((end_name = strchr(p_name,'\"')) == 0) | |
343 | return -1; | |
344 | ||
345 | strncpy(s->hd->backing_file, p_name, end_name - p_name); | |
346 | if (stat(s->hd->backing_file, &file_buf) != 0) { | |
347 | path_combine(parent_img_name, sizeof(parent_img_name), | |
348 | filename, s->hd->backing_file); | |
349 | } else { | |
350 | strcpy(parent_img_name, s->hd->backing_file); | |
351 | } | |
352 | ||
353 | s->hd->backing_hd = bdrv_new(""); | |
354 | if (!s->hd->backing_hd) { | |
355 | failure: | |
356 | bdrv_close(s->hd); | |
357 | return -1; | |
358 | } | |
359 | parent_open = 1; | |
360 | if (bdrv_open(s->hd->backing_hd, parent_img_name, BDRV_O_RDONLY) < 0) | |
361 | goto failure; | |
362 | parent_open = 0; | |
363 | } | |
364 | ||
365 | return 0; | |
366 | } | |
367 | ||
368 | static int vmdk_open(BlockDriverState *bs, const char *filename, int flags) | |
369 | { | |
370 | BDRVVmdkState *s = bs->opaque; | |
371 | uint32_t magic; | |
372 | int l1_size, i, ret; | |
373 | ||
374 | if (parent_open) | |
375 | // Parent must be opened as RO. | |
376 | flags = BDRV_O_RDONLY; | |
377 | fprintf(stderr, "(VMDK) image open: flags=0x%x filename=%s\n", flags, bs->filename); | |
378 | ||
379 | ret = bdrv_file_open(&s->hd, filename, flags); | |
380 | if (ret < 0) | |
381 | return ret; | |
382 | if (bdrv_pread(s->hd, 0, &magic, sizeof(magic)) != sizeof(magic)) | |
383 | goto fail; | |
384 | ||
385 | magic = be32_to_cpu(magic); | |
386 | if (magic == VMDK3_MAGIC) { | |
387 | VMDK3Header header; | |
388 | ||
389 | if (bdrv_pread(s->hd, sizeof(magic), &header, sizeof(header)) != sizeof(header)) | |
390 | goto fail; | |
391 | s->cluster_sectors = le32_to_cpu(header.granularity); | |
392 | s->l2_size = 1 << 9; | |
393 | s->l1_size = 1 << 6; | |
394 | bs->total_sectors = le32_to_cpu(header.disk_sectors); | |
395 | s->l1_table_offset = le32_to_cpu(header.l1dir_offset) << 9; | |
396 | s->l1_backup_table_offset = 0; | |
397 | s->l1_entry_sectors = s->l2_size * s->cluster_sectors; | |
398 | } else if (magic == VMDK4_MAGIC) { | |
399 | VMDK4Header header; | |
400 | ||
401 | if (bdrv_pread(s->hd, sizeof(magic), &header, sizeof(header)) != sizeof(header)) | |
402 | goto fail; | |
403 | bs->total_sectors = le64_to_cpu(header.capacity); | |
404 | s->cluster_sectors = le64_to_cpu(header.granularity); | |
405 | s->l2_size = le32_to_cpu(header.num_gtes_per_gte); | |
406 | s->l1_entry_sectors = s->l2_size * s->cluster_sectors; | |
407 | if (s->l1_entry_sectors <= 0) | |
408 | goto fail; | |
409 | s->l1_size = (bs->total_sectors + s->l1_entry_sectors - 1) | |
410 | / s->l1_entry_sectors; | |
411 | s->l1_table_offset = le64_to_cpu(header.rgd_offset) << 9; | |
412 | s->l1_backup_table_offset = le64_to_cpu(header.gd_offset) << 9; | |
413 | ||
414 | if (parent_open) | |
415 | s->is_parent = 1; | |
416 | else | |
417 | s->is_parent = 0; | |
418 | ||
419 | // try to open parent images, if exist | |
420 | if (vmdk_parent_open(bs, filename) != 0) | |
421 | goto fail; | |
422 | // write the CID once after the image creation | |
423 | s->parent_cid = vmdk_read_cid(bs,1); | |
424 | } else { | |
425 | goto fail; | |
426 | } | |
427 | ||
428 | /* read the L1 table */ | |
429 | l1_size = s->l1_size * sizeof(uint32_t); | |
430 | s->l1_table = qemu_malloc(l1_size); | |
431 | if (!s->l1_table) | |
432 | goto fail; | |
433 | if (bdrv_pread(s->hd, s->l1_table_offset, s->l1_table, l1_size) != l1_size) | |
434 | goto fail; | |
435 | for(i = 0; i < s->l1_size; i++) { | |
436 | le32_to_cpus(&s->l1_table[i]); | |
437 | } | |
438 | ||
439 | if (s->l1_backup_table_offset) { | |
440 | s->l1_backup_table = qemu_malloc(l1_size); | |
441 | if (!s->l1_backup_table) | |
442 | goto fail; | |
443 | if (bdrv_pread(s->hd, s->l1_backup_table_offset, s->l1_backup_table, l1_size) != l1_size) | |
444 | goto fail; | |
445 | for(i = 0; i < s->l1_size; i++) { | |
446 | le32_to_cpus(&s->l1_backup_table[i]); | |
447 | } | |
448 | } | |
449 | ||
450 | s->l2_cache = qemu_malloc(s->l2_size * L2_CACHE_SIZE * sizeof(uint32_t)); | |
451 | if (!s->l2_cache) | |
452 | goto fail; | |
453 | return 0; | |
454 | fail: | |
455 | qemu_free(s->l1_backup_table); | |
456 | qemu_free(s->l1_table); | |
457 | qemu_free(s->l2_cache); | |
458 | bdrv_delete(s->hd); | |
459 | return -1; | |
460 | } | |
461 | ||
462 | static uint64_t get_cluster_offset(BlockDriverState *bs, VmdkMetaData *m_data, | |
463 | uint64_t offset, int allocate); | |
464 | ||
465 | static int get_whole_cluster(BlockDriverState *bs, uint64_t cluster_offset, | |
466 | uint64_t offset, int allocate) | |
467 | { | |
468 | uint64_t parent_cluster_offset; | |
469 | BDRVVmdkState *s = bs->opaque; | |
470 | uint8_t whole_grain[s->cluster_sectors*512]; // 128 sectors * 512 bytes each = grain size 64KB | |
471 | ||
472 | // we will be here if it's first write on non-exist grain(cluster). | |
473 | // try to read from parent image, if exist | |
474 | if (s->hd->backing_hd) { | |
475 | BDRVVmdkState *ps = s->hd->backing_hd->opaque; | |
476 | ||
477 | if (!vmdk_is_cid_valid(bs)) | |
478 | return -1; | |
479 | ||
480 | parent_cluster_offset = get_cluster_offset(s->hd->backing_hd, NULL, offset, allocate); | |
481 | ||
482 | if (parent_cluster_offset) { | |
483 | BDRVVmdkState *act_s = activeBDRV.hd->opaque; | |
484 | ||
485 | if (bdrv_pread(ps->hd, parent_cluster_offset, whole_grain, ps->cluster_sectors*512) != ps->cluster_sectors*512) | |
486 | return -1; | |
487 | ||
488 | //Write grain only into the active image | |
489 | if (bdrv_pwrite(act_s->hd, activeBDRV.cluster_offset << 9, whole_grain, sizeof(whole_grain)) != sizeof(whole_grain)) | |
490 | return -1; | |
491 | } | |
492 | } | |
493 | return 0; | |
494 | } | |
495 | ||
496 | static int vmdk_L2update(BlockDriverState *bs, VmdkMetaData *m_data) | |
497 | { | |
498 | BDRVVmdkState *s = bs->opaque; | |
499 | ||
500 | /* update L2 table */ | |
501 | if (bdrv_pwrite(s->hd, ((int64_t)m_data->l2_offset * 512) + (m_data->l2_index * sizeof(m_data->offset)), | |
502 | &(m_data->offset), sizeof(m_data->offset)) != sizeof(m_data->offset)) | |
503 | return -1; | |
504 | /* update backup L2 table */ | |
505 | if (s->l1_backup_table_offset != 0) { | |
506 | m_data->l2_offset = s->l1_backup_table[m_data->l1_index]; | |
507 | if (bdrv_pwrite(s->hd, ((int64_t)m_data->l2_offset * 512) + (m_data->l2_index * sizeof(m_data->offset)), | |
508 | &(m_data->offset), sizeof(m_data->offset)) != sizeof(m_data->offset)) | |
509 | return -1; | |
510 | } | |
511 | ||
512 | return 0; | |
513 | } | |
514 | ||
515 | static uint64_t get_cluster_offset(BlockDriverState *bs, VmdkMetaData *m_data, | |
516 | uint64_t offset, int allocate) | |
517 | { | |
518 | BDRVVmdkState *s = bs->opaque; | |
519 | unsigned int l1_index, l2_offset, l2_index; | |
520 | int min_index, i, j; | |
521 | uint32_t min_count, *l2_table, tmp = 0; | |
522 | uint64_t cluster_offset; | |
523 | ||
524 | if (m_data) | |
525 | m_data->valid = 0; | |
526 | ||
527 | l1_index = (offset >> 9) / s->l1_entry_sectors; | |
528 | if (l1_index >= s->l1_size) | |
529 | return 0; | |
530 | l2_offset = s->l1_table[l1_index]; | |
531 | if (!l2_offset) | |
532 | return 0; | |
533 | for(i = 0; i < L2_CACHE_SIZE; i++) { | |
534 | if (l2_offset == s->l2_cache_offsets[i]) { | |
535 | /* increment the hit count */ | |
536 | if (++s->l2_cache_counts[i] == 0xffffffff) { | |
537 | for(j = 0; j < L2_CACHE_SIZE; j++) { | |
538 | s->l2_cache_counts[j] >>= 1; | |
539 | } | |
540 | } | |
541 | l2_table = s->l2_cache + (i * s->l2_size); | |
542 | goto found; | |
543 | } | |
544 | } | |
545 | /* not found: load a new entry in the least used one */ | |
546 | min_index = 0; | |
547 | min_count = 0xffffffff; | |
548 | for(i = 0; i < L2_CACHE_SIZE; i++) { | |
549 | if (s->l2_cache_counts[i] < min_count) { | |
550 | min_count = s->l2_cache_counts[i]; | |
551 | min_index = i; | |
552 | } | |
553 | } | |
554 | l2_table = s->l2_cache + (min_index * s->l2_size); | |
555 | if (bdrv_pread(s->hd, (int64_t)l2_offset * 512, l2_table, s->l2_size * sizeof(uint32_t)) != | |
556 | s->l2_size * sizeof(uint32_t)) | |
557 | return 0; | |
558 | ||
559 | s->l2_cache_offsets[min_index] = l2_offset; | |
560 | s->l2_cache_counts[min_index] = 1; | |
561 | found: | |
562 | l2_index = ((offset >> 9) / s->cluster_sectors) % s->l2_size; | |
563 | cluster_offset = le32_to_cpu(l2_table[l2_index]); | |
564 | ||
565 | if (!cluster_offset) { | |
566 | if (!allocate) | |
567 | return 0; | |
568 | // Avoid the L2 tables update for the images that have snapshots. | |
569 | if (!s->is_parent) { | |
570 | cluster_offset = bdrv_getlength(s->hd); | |
571 | bdrv_truncate(s->hd, cluster_offset + (s->cluster_sectors << 9)); | |
572 | ||
573 | cluster_offset >>= 9; | |
574 | tmp = cpu_to_le32(cluster_offset); | |
575 | l2_table[l2_index] = tmp; | |
576 | // Save the active image state | |
577 | activeBDRV.cluster_offset = cluster_offset; | |
578 | activeBDRV.hd = bs; | |
579 | } | |
580 | /* First of all we write grain itself, to avoid race condition | |
581 | * that may to corrupt the image. | |
582 | * This problem may occur because of insufficient space on host disk | |
583 | * or inappropriate VM shutdown. | |
584 | */ | |
585 | if (get_whole_cluster(bs, cluster_offset, offset, allocate) == -1) | |
586 | return 0; | |
587 | ||
588 | if (m_data) { | |
589 | m_data->offset = tmp; | |
590 | m_data->l1_index = l1_index; | |
591 | m_data->l2_index = l2_index; | |
592 | m_data->l2_offset = l2_offset; | |
593 | m_data->valid = 1; | |
594 | } | |
595 | } | |
596 | cluster_offset <<= 9; | |
597 | return cluster_offset; | |
598 | } | |
599 | ||
600 | static int vmdk_is_allocated(BlockDriverState *bs, int64_t sector_num, | |
601 | int nb_sectors, int *pnum) | |
602 | { | |
603 | BDRVVmdkState *s = bs->opaque; | |
604 | int index_in_cluster, n; | |
605 | uint64_t cluster_offset; | |
606 | ||
607 | cluster_offset = get_cluster_offset(bs, NULL, sector_num << 9, 0); | |
608 | index_in_cluster = sector_num % s->cluster_sectors; | |
609 | n = s->cluster_sectors - index_in_cluster; | |
610 | if (n > nb_sectors) | |
611 | n = nb_sectors; | |
612 | *pnum = n; | |
613 | return (cluster_offset != 0); | |
614 | } | |
615 | ||
616 | static int vmdk_read(BlockDriverState *bs, int64_t sector_num, | |
617 | uint8_t *buf, int nb_sectors) | |
618 | { | |
619 | BDRVVmdkState *s = bs->opaque; | |
620 | int index_in_cluster, n, ret; | |
621 | uint64_t cluster_offset; | |
622 | ||
623 | while (nb_sectors > 0) { | |
624 | cluster_offset = get_cluster_offset(bs, NULL, sector_num << 9, 0); | |
625 | index_in_cluster = sector_num % s->cluster_sectors; | |
626 | n = s->cluster_sectors - index_in_cluster; | |
627 | if (n > nb_sectors) | |
628 | n = nb_sectors; | |
629 | if (!cluster_offset) { | |
630 | // try to read from parent image, if exist | |
631 | if (s->hd->backing_hd) { | |
632 | if (!vmdk_is_cid_valid(bs)) | |
633 | return -1; | |
634 | ret = bdrv_read(s->hd->backing_hd, sector_num, buf, n); | |
635 | if (ret < 0) | |
636 | return -1; | |
637 | } else { | |
638 | memset(buf, 0, 512 * n); | |
639 | } | |
640 | } else { | |
641 | if(bdrv_pread(s->hd, cluster_offset + index_in_cluster * 512, buf, n * 512) != n * 512) | |
642 | return -1; | |
643 | } | |
644 | nb_sectors -= n; | |
645 | sector_num += n; | |
646 | buf += n * 512; | |
647 | } | |
648 | return 0; | |
649 | } | |
650 | ||
651 | static int vmdk_write(BlockDriverState *bs, int64_t sector_num, | |
652 | const uint8_t *buf, int nb_sectors) | |
653 | { | |
654 | BDRVVmdkState *s = bs->opaque; | |
655 | VmdkMetaData m_data; | |
656 | int index_in_cluster, n; | |
657 | uint64_t cluster_offset; | |
658 | static int cid_update = 0; | |
659 | ||
660 | if (sector_num > bs->total_sectors) { | |
661 | fprintf(stderr, | |
662 | "(VMDK) Wrong offset: sector_num=0x%llx total_sectors=0x%llx\n", | |
663 | sector_num, bs->total_sectors); | |
664 | return -1; | |
665 | } | |
666 | ||
667 | while (nb_sectors > 0) { | |
668 | index_in_cluster = sector_num & (s->cluster_sectors - 1); | |
669 | n = s->cluster_sectors - index_in_cluster; | |
670 | if (n > nb_sectors) | |
671 | n = nb_sectors; | |
672 | cluster_offset = get_cluster_offset(bs, &m_data, sector_num << 9, 1); | |
673 | if (!cluster_offset) | |
674 | return -1; | |
675 | ||
676 | if (bdrv_pwrite(s->hd, cluster_offset + index_in_cluster * 512, buf, n * 512) != n * 512) | |
677 | return -1; | |
678 | if (m_data.valid) { | |
679 | /* update L2 tables */ | |
680 | if (vmdk_L2update(bs, &m_data) == -1) | |
681 | return -1; | |
682 | } | |
683 | nb_sectors -= n; | |
684 | sector_num += n; | |
685 | buf += n * 512; | |
686 | ||
687 | // update CID on the first write every time the virtual disk is opened | |
688 | if (!cid_update) { | |
689 | vmdk_write_cid(bs, time(NULL)); | |
690 | cid_update++; | |
691 | } | |
692 | } | |
693 | return 0; | |
694 | } | |
695 | ||
696 | static int vmdk_create(const char *filename, int64_t total_size, | |
697 | const char *backing_file, int flags) | |
698 | { | |
699 | int fd, i; | |
700 | VMDK4Header header; | |
701 | uint32_t tmp, magic, grains, gd_size, gt_size, gt_count; | |
702 | char *desc_template = | |
703 | "# Disk DescriptorFile\n" | |
704 | "version=1\n" | |
705 | "CID=%x\n" | |
706 | "parentCID=ffffffff\n" | |
707 | "createType=\"monolithicSparse\"\n" | |
708 | "\n" | |
709 | "# Extent description\n" | |
710 | "RW %lu SPARSE \"%s\"\n" | |
711 | "\n" | |
712 | "# The Disk Data Base \n" | |
713 | "#DDB\n" | |
714 | "\n" | |
715 | "ddb.virtualHWVersion = \"%d\"\n" | |
716 | "ddb.geometry.cylinders = \"%lu\"\n" | |
717 | "ddb.geometry.heads = \"16\"\n" | |
718 | "ddb.geometry.sectors = \"63\"\n" | |
719 | "ddb.adapterType = \"ide\"\n"; | |
720 | char desc[1024]; | |
721 | const char *real_filename, *temp_str; | |
722 | ||
723 | /* XXX: add support for backing file */ | |
724 | if (backing_file) { | |
725 | return vmdk_snapshot_create(filename, backing_file); | |
726 | } | |
727 | ||
728 | fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, | |
729 | 0644); | |
730 | if (fd < 0) | |
731 | return -1; | |
732 | magic = cpu_to_be32(VMDK4_MAGIC); | |
733 | memset(&header, 0, sizeof(header)); | |
734 | header.version = cpu_to_le32(1); | |
735 | header.flags = cpu_to_le32(3); /* ?? */ | |
736 | header.capacity = cpu_to_le64(total_size); | |
737 | header.granularity = cpu_to_le64(128); | |
738 | header.num_gtes_per_gte = cpu_to_le32(512); | |
739 | ||
740 | grains = (total_size + header.granularity - 1) / header.granularity; | |
741 | gt_size = ((header.num_gtes_per_gte * sizeof(uint32_t)) + 511) >> 9; | |
742 | gt_count = (grains + header.num_gtes_per_gte - 1) / header.num_gtes_per_gte; | |
743 | gd_size = (gt_count * sizeof(uint32_t) + 511) >> 9; | |
744 | ||
745 | header.desc_offset = 1; | |
746 | header.desc_size = 20; | |
747 | header.rgd_offset = header.desc_offset + header.desc_size; | |
748 | header.gd_offset = header.rgd_offset + gd_size + (gt_size * gt_count); | |
749 | header.grain_offset = | |
750 | ((header.gd_offset + gd_size + (gt_size * gt_count) + | |
751 | header.granularity - 1) / header.granularity) * | |
752 | header.granularity; | |
753 | ||
754 | header.desc_offset = cpu_to_le64(header.desc_offset); | |
755 | header.desc_size = cpu_to_le64(header.desc_size); | |
756 | header.rgd_offset = cpu_to_le64(header.rgd_offset); | |
757 | header.gd_offset = cpu_to_le64(header.gd_offset); | |
758 | header.grain_offset = cpu_to_le64(header.grain_offset); | |
759 | ||
760 | header.check_bytes[0] = 0xa; | |
761 | header.check_bytes[1] = 0x20; | |
762 | header.check_bytes[2] = 0xd; | |
763 | header.check_bytes[3] = 0xa; | |
764 | ||
765 | /* write all the data */ | |
766 | write(fd, &magic, sizeof(magic)); | |
767 | write(fd, &header, sizeof(header)); | |
768 | ||
769 | ftruncate(fd, header.grain_offset << 9); | |
770 | ||
771 | /* write grain directory */ | |
772 | lseek(fd, le64_to_cpu(header.rgd_offset) << 9, SEEK_SET); | |
773 | for (i = 0, tmp = header.rgd_offset + gd_size; | |
774 | i < gt_count; i++, tmp += gt_size) | |
775 | write(fd, &tmp, sizeof(tmp)); | |
776 | ||
777 | /* write backup grain directory */ | |
778 | lseek(fd, le64_to_cpu(header.gd_offset) << 9, SEEK_SET); | |
779 | for (i = 0, tmp = header.gd_offset + gd_size; | |
780 | i < gt_count; i++, tmp += gt_size) | |
781 | write(fd, &tmp, sizeof(tmp)); | |
782 | ||
783 | /* compose the descriptor */ | |
784 | real_filename = filename; | |
785 | if ((temp_str = strrchr(real_filename, '\\')) != NULL) | |
786 | real_filename = temp_str + 1; | |
787 | if ((temp_str = strrchr(real_filename, '/')) != NULL) | |
788 | real_filename = temp_str + 1; | |
789 | if ((temp_str = strrchr(real_filename, ':')) != NULL) | |
790 | real_filename = temp_str + 1; | |
791 | sprintf(desc, desc_template, time(NULL), (unsigned long)total_size, | |
792 | real_filename, (flags & BLOCK_FLAG_COMPAT6 ? 6 : 4), total_size / (63 * 16)); | |
793 | ||
794 | /* write the descriptor */ | |
795 | lseek(fd, le64_to_cpu(header.desc_offset) << 9, SEEK_SET); | |
796 | write(fd, desc, strlen(desc)); | |
797 | ||
798 | close(fd); | |
799 | return 0; | |
800 | } | |
801 | ||
802 | static void vmdk_close(BlockDriverState *bs) | |
803 | { | |
804 | BDRVVmdkState *s = bs->opaque; | |
805 | ||
806 | qemu_free(s->l1_table); | |
807 | qemu_free(s->l2_cache); | |
808 | bdrv_delete(s->hd); | |
809 | // try to close parent image, if exist | |
810 | vmdk_parent_close(s->hd); | |
811 | } | |
812 | ||
813 | static void vmdk_flush(BlockDriverState *bs) | |
814 | { | |
815 | BDRVVmdkState *s = bs->opaque; | |
816 | bdrv_flush(s->hd); | |
817 | } | |
818 | ||
819 | BlockDriver bdrv_vmdk = { | |
820 | "vmdk", | |
821 | sizeof(BDRVVmdkState), | |
822 | vmdk_probe, | |
823 | vmdk_open, | |
824 | vmdk_read, | |
825 | vmdk_write, | |
826 | vmdk_close, | |
827 | vmdk_create, | |
828 | vmdk_flush, | |
829 | vmdk_is_allocated, | |
830 | }; |