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Commit | Line | Data |
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ea2384d3 FB |
1 | /* |
2 | * Block driver for the VMDK format | |
5fafdf24 | 3 | * |
ea2384d3 | 4 | * Copyright (c) 2004 Fabrice Bellard |
ff1afc72 | 5 | * Copyright (c) 2005 Filip Navara |
5fafdf24 | 6 | * |
ea2384d3 FB |
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 | */ | |
5f4da8c0 | 25 | |
faf07963 | 26 | #include "qemu-common.h" |
ea2384d3 FB |
27 | #include "block_int.h" |
28 | ||
ea2384d3 FB |
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]; | |
ff1afc72 | 58 | } __attribute__((packed)) VMDK4Header; |
ea2384d3 FB |
59 | |
60 | #define L2_CACHE_SIZE 16 | |
61 | ||
62 | typedef struct BDRVVmdkState { | |
5f4da8c0 | 63 | BlockDriverState *hd; |
ea2384d3 | 64 | int64_t l1_table_offset; |
ff1afc72 | 65 | int64_t l1_backup_table_offset; |
ea2384d3 | 66 | uint32_t *l1_table; |
ff1afc72 | 67 | uint32_t *l1_backup_table; |
ea2384d3 FB |
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; | |
5f4da8c0 | 77 | uint32_t parent_cid; |
630530a6 | 78 | int is_parent; |
ea2384d3 FB |
79 | } BDRVVmdkState; |
80 | ||
630530a6 TS |
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 | ||
ea2384d3 FB |
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 | ||
5f4da8c0 TS |
111 | #define CHECK_CID 1 |
112 | ||
3b46e624 | 113 | #define SECTOR_SIZE 512 |
5f4da8c0 | 114 | #define DESC_SIZE 20*SECTOR_SIZE // 20 sectors of 512 bytes each |
5fafdf24 | 115 | #define HEADER_SIZE 512 // first sector of 512 bytes |
5f4da8c0 TS |
116 | |
117 | static uint32_t vmdk_read_cid(BlockDriverState *bs, int parent) | |
ea2384d3 FB |
118 | { |
119 | BDRVVmdkState *s = bs->opaque; | |
5f4da8c0 TS |
120 | char desc[DESC_SIZE]; |
121 | uint32_t cid; | |
5fafdf24 | 122 | char *p_name, *cid_str; |
5f4da8c0 TS |
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; | |
5fafdf24 | 190 | char *p_name, *gd_buf, *rgd_buf; |
5f4da8c0 TS |
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; | |
ea2384d3 | 263 | |
5f4da8c0 TS |
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; | |
5fafdf24 | 274 | gde_entries = (uint32_t)(capacity / gt_size); // number of gde/rgde |
5f4da8c0 TS |
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); | |
3b46e624 | 311 | fail_rgd: |
5f4da8c0 TS |
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 | ||
630530a6 | 325 | int parent_open = 0; |
5f4da8c0 TS |
326 | static int vmdk_parent_open(BlockDriverState *bs, const char * filename) |
327 | { | |
328 | BDRVVmdkState *s = bs->opaque; | |
5fafdf24 | 329 | char *p_name; |
5f4da8c0 TS |
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; | |
b34d259a AZ |
344 | if ((end_name - p_name) > sizeof (s->hd->backing_file) - 1) |
345 | return -1; | |
3b46e624 | 346 | |
5f4da8c0 TS |
347 | strncpy(s->hd->backing_file, p_name, end_name - p_name); |
348 | if (stat(s->hd->backing_file, &file_buf) != 0) { | |
349 | path_combine(parent_img_name, sizeof(parent_img_name), | |
350 | filename, s->hd->backing_file); | |
351 | } else { | |
352 | strcpy(parent_img_name, s->hd->backing_file); | |
353 | } | |
354 | ||
355 | s->hd->backing_hd = bdrv_new(""); | |
356 | if (!s->hd->backing_hd) { | |
357 | failure: | |
358 | bdrv_close(s->hd); | |
ff1afc72 | 359 | return -1; |
5f4da8c0 | 360 | } |
630530a6 TS |
361 | parent_open = 1; |
362 | if (bdrv_open(s->hd->backing_hd, parent_img_name, BDRV_O_RDONLY) < 0) | |
5f4da8c0 | 363 | goto failure; |
630530a6 | 364 | parent_open = 0; |
ff1afc72 | 365 | } |
5f4da8c0 TS |
366 | |
367 | return 0; | |
368 | } | |
369 | ||
370 | static int vmdk_open(BlockDriverState *bs, const char *filename, int flags) | |
371 | { | |
372 | BDRVVmdkState *s = bs->opaque; | |
373 | uint32_t magic; | |
374 | int l1_size, i, ret; | |
375 | ||
630530a6 TS |
376 | if (parent_open) |
377 | // Parent must be opened as RO. | |
378 | flags = BDRV_O_RDONLY; | |
630530a6 | 379 | |
b5eff355 | 380 | ret = bdrv_file_open(&s->hd, filename, flags); |
5f4da8c0 TS |
381 | if (ret < 0) |
382 | return ret; | |
383 | if (bdrv_pread(s->hd, 0, &magic, sizeof(magic)) != sizeof(magic)) | |
ea2384d3 | 384 | goto fail; |
5f4da8c0 | 385 | |
7143c62c | 386 | magic = be32_to_cpu(magic); |
ea2384d3 FB |
387 | if (magic == VMDK3_MAGIC) { |
388 | VMDK3Header header; | |
5f4da8c0 TS |
389 | |
390 | if (bdrv_pread(s->hd, sizeof(magic), &header, sizeof(header)) != sizeof(header)) | |
ea2384d3 FB |
391 | goto fail; |
392 | s->cluster_sectors = le32_to_cpu(header.granularity); | |
393 | s->l2_size = 1 << 9; | |
394 | s->l1_size = 1 << 6; | |
395 | bs->total_sectors = le32_to_cpu(header.disk_sectors); | |
ff1afc72 FB |
396 | s->l1_table_offset = le32_to_cpu(header.l1dir_offset) << 9; |
397 | s->l1_backup_table_offset = 0; | |
ea2384d3 FB |
398 | s->l1_entry_sectors = s->l2_size * s->cluster_sectors; |
399 | } else if (magic == VMDK4_MAGIC) { | |
400 | VMDK4Header header; | |
5f4da8c0 TS |
401 | |
402 | if (bdrv_pread(s->hd, sizeof(magic), &header, sizeof(header)) != sizeof(header)) | |
ea2384d3 | 403 | goto fail; |
bd6ea3c8 FB |
404 | bs->total_sectors = le64_to_cpu(header.capacity); |
405 | s->cluster_sectors = le64_to_cpu(header.granularity); | |
ea2384d3 FB |
406 | s->l2_size = le32_to_cpu(header.num_gtes_per_gte); |
407 | s->l1_entry_sectors = s->l2_size * s->cluster_sectors; | |
408 | if (s->l1_entry_sectors <= 0) | |
409 | goto fail; | |
5fafdf24 | 410 | s->l1_size = (bs->total_sectors + s->l1_entry_sectors - 1) |
ea2384d3 | 411 | / s->l1_entry_sectors; |
ff1afc72 FB |
412 | s->l1_table_offset = le64_to_cpu(header.rgd_offset) << 9; |
413 | s->l1_backup_table_offset = le64_to_cpu(header.gd_offset) << 9; | |
5f4da8c0 | 414 | |
630530a6 TS |
415 | if (parent_open) |
416 | s->is_parent = 1; | |
417 | else | |
418 | s->is_parent = 0; | |
419 | ||
5f4da8c0 TS |
420 | // try to open parent images, if exist |
421 | if (vmdk_parent_open(bs, filename) != 0) | |
422 | goto fail; | |
423 | // write the CID once after the image creation | |
424 | s->parent_cid = vmdk_read_cid(bs,1); | |
ea2384d3 FB |
425 | } else { |
426 | goto fail; | |
427 | } | |
5f4da8c0 | 428 | |
ea2384d3 FB |
429 | /* read the L1 table */ |
430 | l1_size = s->l1_size * sizeof(uint32_t); | |
431 | s->l1_table = qemu_malloc(l1_size); | |
432 | if (!s->l1_table) | |
433 | goto fail; | |
5f4da8c0 | 434 | if (bdrv_pread(s->hd, s->l1_table_offset, s->l1_table, l1_size) != l1_size) |
ea2384d3 FB |
435 | goto fail; |
436 | for(i = 0; i < s->l1_size; i++) { | |
437 | le32_to_cpus(&s->l1_table[i]); | |
438 | } | |
439 | ||
ff1afc72 FB |
440 | if (s->l1_backup_table_offset) { |
441 | s->l1_backup_table = qemu_malloc(l1_size); | |
442 | if (!s->l1_backup_table) | |
443 | goto fail; | |
5f4da8c0 | 444 | if (bdrv_pread(s->hd, s->l1_backup_table_offset, s->l1_backup_table, l1_size) != l1_size) |
ff1afc72 FB |
445 | goto fail; |
446 | for(i = 0; i < s->l1_size; i++) { | |
447 | le32_to_cpus(&s->l1_backup_table[i]); | |
448 | } | |
449 | } | |
450 | ||
ea2384d3 FB |
451 | s->l2_cache = qemu_malloc(s->l2_size * L2_CACHE_SIZE * sizeof(uint32_t)); |
452 | if (!s->l2_cache) | |
453 | goto fail; | |
ea2384d3 FB |
454 | return 0; |
455 | fail: | |
ff1afc72 | 456 | qemu_free(s->l1_backup_table); |
ea2384d3 FB |
457 | qemu_free(s->l1_table); |
458 | qemu_free(s->l2_cache); | |
5f4da8c0 | 459 | bdrv_delete(s->hd); |
ea2384d3 FB |
460 | return -1; |
461 | } | |
462 | ||
630530a6 TS |
463 | static uint64_t get_cluster_offset(BlockDriverState *bs, VmdkMetaData *m_data, |
464 | uint64_t offset, int allocate); | |
5f4da8c0 TS |
465 | |
466 | static int get_whole_cluster(BlockDriverState *bs, uint64_t cluster_offset, | |
467 | uint64_t offset, int allocate) | |
468 | { | |
469 | uint64_t parent_cluster_offset; | |
470 | BDRVVmdkState *s = bs->opaque; | |
471 | uint8_t whole_grain[s->cluster_sectors*512]; // 128 sectors * 512 bytes each = grain size 64KB | |
472 | ||
473 | // we will be here if it's first write on non-exist grain(cluster). | |
474 | // try to read from parent image, if exist | |
475 | if (s->hd->backing_hd) { | |
476 | BDRVVmdkState *ps = s->hd->backing_hd->opaque; | |
477 | ||
478 | if (!vmdk_is_cid_valid(bs)) | |
479 | return -1; | |
5f4da8c0 | 480 | |
630530a6 TS |
481 | parent_cluster_offset = get_cluster_offset(s->hd->backing_hd, NULL, offset, allocate); |
482 | ||
483 | if (parent_cluster_offset) { | |
484 | BDRVVmdkState *act_s = activeBDRV.hd->opaque; | |
485 | ||
486 | if (bdrv_pread(ps->hd, parent_cluster_offset, whole_grain, ps->cluster_sectors*512) != ps->cluster_sectors*512) | |
487 | return -1; | |
488 | ||
489 | //Write grain only into the active image | |
490 | if (bdrv_pwrite(act_s->hd, activeBDRV.cluster_offset << 9, whole_grain, sizeof(whole_grain)) != sizeof(whole_grain)) | |
491 | return -1; | |
492 | } | |
493 | } | |
494 | return 0; | |
495 | } | |
496 | ||
497 | static int vmdk_L2update(BlockDriverState *bs, VmdkMetaData *m_data) | |
498 | { | |
499 | BDRVVmdkState *s = bs->opaque; | |
500 | ||
501 | /* update L2 table */ | |
502 | if (bdrv_pwrite(s->hd, ((int64_t)m_data->l2_offset * 512) + (m_data->l2_index * sizeof(m_data->offset)), | |
503 | &(m_data->offset), sizeof(m_data->offset)) != sizeof(m_data->offset)) | |
504 | return -1; | |
505 | /* update backup L2 table */ | |
506 | if (s->l1_backup_table_offset != 0) { | |
507 | m_data->l2_offset = s->l1_backup_table[m_data->l1_index]; | |
508 | if (bdrv_pwrite(s->hd, ((int64_t)m_data->l2_offset * 512) + (m_data->l2_index * sizeof(m_data->offset)), | |
509 | &(m_data->offset), sizeof(m_data->offset)) != sizeof(m_data->offset)) | |
5f4da8c0 TS |
510 | return -1; |
511 | } | |
630530a6 | 512 | |
5f4da8c0 TS |
513 | return 0; |
514 | } | |
515 | ||
630530a6 | 516 | static uint64_t get_cluster_offset(BlockDriverState *bs, VmdkMetaData *m_data, |
ff1afc72 | 517 | uint64_t offset, int allocate) |
ea2384d3 FB |
518 | { |
519 | BDRVVmdkState *s = bs->opaque; | |
520 | unsigned int l1_index, l2_offset, l2_index; | |
521 | int min_index, i, j; | |
630530a6 | 522 | uint32_t min_count, *l2_table, tmp = 0; |
ea2384d3 | 523 | uint64_t cluster_offset; |
630530a6 TS |
524 | |
525 | if (m_data) | |
526 | m_data->valid = 0; | |
527 | ||
ea2384d3 FB |
528 | l1_index = (offset >> 9) / s->l1_entry_sectors; |
529 | if (l1_index >= s->l1_size) | |
530 | return 0; | |
531 | l2_offset = s->l1_table[l1_index]; | |
532 | if (!l2_offset) | |
533 | return 0; | |
ea2384d3 FB |
534 | for(i = 0; i < L2_CACHE_SIZE; i++) { |
535 | if (l2_offset == s->l2_cache_offsets[i]) { | |
536 | /* increment the hit count */ | |
537 | if (++s->l2_cache_counts[i] == 0xffffffff) { | |
538 | for(j = 0; j < L2_CACHE_SIZE; j++) { | |
539 | s->l2_cache_counts[j] >>= 1; | |
540 | } | |
541 | } | |
542 | l2_table = s->l2_cache + (i * s->l2_size); | |
543 | goto found; | |
544 | } | |
545 | } | |
546 | /* not found: load a new entry in the least used one */ | |
547 | min_index = 0; | |
548 | min_count = 0xffffffff; | |
549 | for(i = 0; i < L2_CACHE_SIZE; i++) { | |
550 | if (s->l2_cache_counts[i] < min_count) { | |
551 | min_count = s->l2_cache_counts[i]; | |
552 | min_index = i; | |
553 | } | |
554 | } | |
555 | l2_table = s->l2_cache + (min_index * s->l2_size); | |
5fafdf24 | 556 | if (bdrv_pread(s->hd, (int64_t)l2_offset * 512, l2_table, s->l2_size * sizeof(uint32_t)) != |
5f4da8c0 | 557 | s->l2_size * sizeof(uint32_t)) |
ea2384d3 | 558 | return 0; |
5f4da8c0 | 559 | |
ea2384d3 FB |
560 | s->l2_cache_offsets[min_index] = l2_offset; |
561 | s->l2_cache_counts[min_index] = 1; | |
562 | found: | |
563 | l2_index = ((offset >> 9) / s->cluster_sectors) % s->l2_size; | |
564 | cluster_offset = le32_to_cpu(l2_table[l2_index]); | |
630530a6 | 565 | |
ff1afc72 FB |
566 | if (!cluster_offset) { |
567 | if (!allocate) | |
568 | return 0; | |
630530a6 TS |
569 | // Avoid the L2 tables update for the images that have snapshots. |
570 | if (!s->is_parent) { | |
49140a77 | 571 | cluster_offset = bdrv_getlength(s->hd); |
630530a6 TS |
572 | bdrv_truncate(s->hd, cluster_offset + (s->cluster_sectors << 9)); |
573 | ||
574 | cluster_offset >>= 9; | |
575 | tmp = cpu_to_le32(cluster_offset); | |
576 | l2_table[l2_index] = tmp; | |
577 | // Save the active image state | |
578 | activeBDRV.cluster_offset = cluster_offset; | |
579 | activeBDRV.hd = bs; | |
ff1afc72 | 580 | } |
630530a6 TS |
581 | /* First of all we write grain itself, to avoid race condition |
582 | * that may to corrupt the image. | |
583 | * This problem may occur because of insufficient space on host disk | |
584 | * or inappropriate VM shutdown. | |
585 | */ | |
5f4da8c0 TS |
586 | if (get_whole_cluster(bs, cluster_offset, offset, allocate) == -1) |
587 | return 0; | |
630530a6 TS |
588 | |
589 | if (m_data) { | |
590 | m_data->offset = tmp; | |
591 | m_data->l1_index = l1_index; | |
592 | m_data->l2_index = l2_index; | |
593 | m_data->l2_offset = l2_offset; | |
594 | m_data->valid = 1; | |
595 | } | |
ff1afc72 | 596 | } |
ea2384d3 FB |
597 | cluster_offset <<= 9; |
598 | return cluster_offset; | |
599 | } | |
600 | ||
5fafdf24 | 601 | static int vmdk_is_allocated(BlockDriverState *bs, int64_t sector_num, |
ea2384d3 FB |
602 | int nb_sectors, int *pnum) |
603 | { | |
604 | BDRVVmdkState *s = bs->opaque; | |
605 | int index_in_cluster, n; | |
606 | uint64_t cluster_offset; | |
607 | ||
630530a6 | 608 | cluster_offset = get_cluster_offset(bs, NULL, sector_num << 9, 0); |
ea2384d3 FB |
609 | index_in_cluster = sector_num % s->cluster_sectors; |
610 | n = s->cluster_sectors - index_in_cluster; | |
611 | if (n > nb_sectors) | |
612 | n = nb_sectors; | |
613 | *pnum = n; | |
614 | return (cluster_offset != 0); | |
615 | } | |
616 | ||
5fafdf24 | 617 | static int vmdk_read(BlockDriverState *bs, int64_t sector_num, |
ea2384d3 FB |
618 | uint8_t *buf, int nb_sectors) |
619 | { | |
620 | BDRVVmdkState *s = bs->opaque; | |
5f4da8c0 | 621 | int index_in_cluster, n, ret; |
ea2384d3 | 622 | uint64_t cluster_offset; |
5f4da8c0 | 623 | |
ea2384d3 | 624 | while (nb_sectors > 0) { |
630530a6 | 625 | cluster_offset = get_cluster_offset(bs, NULL, sector_num << 9, 0); |
ea2384d3 FB |
626 | index_in_cluster = sector_num % s->cluster_sectors; |
627 | n = s->cluster_sectors - index_in_cluster; | |
628 | if (n > nb_sectors) | |
629 | n = nb_sectors; | |
630 | if (!cluster_offset) { | |
5f4da8c0 TS |
631 | // try to read from parent image, if exist |
632 | if (s->hd->backing_hd) { | |
633 | if (!vmdk_is_cid_valid(bs)) | |
634 | return -1; | |
635 | ret = bdrv_read(s->hd->backing_hd, sector_num, buf, n); | |
636 | if (ret < 0) | |
637 | return -1; | |
638 | } else { | |
639 | memset(buf, 0, 512 * n); | |
640 | } | |
ea2384d3 | 641 | } else { |
5f4da8c0 | 642 | if(bdrv_pread(s->hd, cluster_offset + index_in_cluster * 512, buf, n * 512) != n * 512) |
ea2384d3 FB |
643 | return -1; |
644 | } | |
645 | nb_sectors -= n; | |
646 | sector_num += n; | |
647 | buf += n * 512; | |
648 | } | |
649 | return 0; | |
650 | } | |
651 | ||
5fafdf24 | 652 | static int vmdk_write(BlockDriverState *bs, int64_t sector_num, |
ea2384d3 FB |
653 | const uint8_t *buf, int nb_sectors) |
654 | { | |
ff1afc72 | 655 | BDRVVmdkState *s = bs->opaque; |
630530a6 | 656 | VmdkMetaData m_data; |
5f4da8c0 | 657 | int index_in_cluster, n; |
ff1afc72 | 658 | uint64_t cluster_offset; |
5f4da8c0 | 659 | static int cid_update = 0; |
ff1afc72 | 660 | |
630530a6 TS |
661 | if (sector_num > bs->total_sectors) { |
662 | fprintf(stderr, | |
92868412 JM |
663 | "(VMDK) Wrong offset: sector_num=0x%" PRIx64 |
664 | " total_sectors=0x%" PRIx64 "\n", | |
630530a6 TS |
665 | sector_num, bs->total_sectors); |
666 | return -1; | |
667 | } | |
668 | ||
ff1afc72 FB |
669 | while (nb_sectors > 0) { |
670 | index_in_cluster = sector_num & (s->cluster_sectors - 1); | |
671 | n = s->cluster_sectors - index_in_cluster; | |
672 | if (n > nb_sectors) | |
673 | n = nb_sectors; | |
630530a6 | 674 | cluster_offset = get_cluster_offset(bs, &m_data, sector_num << 9, 1); |
ff1afc72 FB |
675 | if (!cluster_offset) |
676 | return -1; | |
630530a6 | 677 | |
5f4da8c0 | 678 | if (bdrv_pwrite(s->hd, cluster_offset + index_in_cluster * 512, buf, n * 512) != n * 512) |
ff1afc72 | 679 | return -1; |
630530a6 TS |
680 | if (m_data.valid) { |
681 | /* update L2 tables */ | |
682 | if (vmdk_L2update(bs, &m_data) == -1) | |
683 | return -1; | |
684 | } | |
ff1afc72 FB |
685 | nb_sectors -= n; |
686 | sector_num += n; | |
687 | buf += n * 512; | |
5f4da8c0 TS |
688 | |
689 | // update CID on the first write every time the virtual disk is opened | |
690 | if (!cid_update) { | |
691 | vmdk_write_cid(bs, time(NULL)); | |
692 | cid_update++; | |
693 | } | |
ff1afc72 FB |
694 | } |
695 | return 0; | |
ea2384d3 FB |
696 | } |
697 | ||
8979b227 FB |
698 | static int vmdk_create(const char *filename, int64_t total_size, |
699 | const char *backing_file, int flags) | |
700 | { | |
701 | int fd, i; | |
702 | VMDK4Header header; | |
703 | uint32_t tmp, magic, grains, gd_size, gt_size, gt_count; | |
704 | char *desc_template = | |
705 | "# Disk DescriptorFile\n" | |
706 | "version=1\n" | |
707 | "CID=%x\n" | |
708 | "parentCID=ffffffff\n" | |
709 | "createType=\"monolithicSparse\"\n" | |
710 | "\n" | |
711 | "# Extent description\n" | |
712 | "RW %lu SPARSE \"%s\"\n" | |
713 | "\n" | |
714 | "# The Disk Data Base \n" | |
715 | "#DDB\n" | |
716 | "\n" | |
ec36ba14 | 717 | "ddb.virtualHWVersion = \"%d\"\n" |
8979b227 FB |
718 | "ddb.geometry.cylinders = \"%lu\"\n" |
719 | "ddb.geometry.heads = \"16\"\n" | |
720 | "ddb.geometry.sectors = \"63\"\n" | |
721 | "ddb.adapterType = \"ide\"\n"; | |
722 | char desc[1024]; | |
723 | const char *real_filename, *temp_str; | |
724 | ||
725 | /* XXX: add support for backing file */ | |
5f4da8c0 TS |
726 | if (backing_file) { |
727 | return vmdk_snapshot_create(filename, backing_file); | |
728 | } | |
8979b227 FB |
729 | |
730 | fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, | |
731 | 0644); | |
732 | if (fd < 0) | |
733 | return -1; | |
734 | magic = cpu_to_be32(VMDK4_MAGIC); | |
735 | memset(&header, 0, sizeof(header)); | |
736 | header.version = cpu_to_le32(1); | |
737 | header.flags = cpu_to_le32(3); /* ?? */ | |
738 | header.capacity = cpu_to_le64(total_size); | |
739 | header.granularity = cpu_to_le64(128); | |
740 | header.num_gtes_per_gte = cpu_to_le32(512); | |
741 | ||
742 | grains = (total_size + header.granularity - 1) / header.granularity; | |
743 | gt_size = ((header.num_gtes_per_gte * sizeof(uint32_t)) + 511) >> 9; | |
744 | gt_count = (grains + header.num_gtes_per_gte - 1) / header.num_gtes_per_gte; | |
745 | gd_size = (gt_count * sizeof(uint32_t) + 511) >> 9; | |
746 | ||
747 | header.desc_offset = 1; | |
748 | header.desc_size = 20; | |
749 | header.rgd_offset = header.desc_offset + header.desc_size; | |
750 | header.gd_offset = header.rgd_offset + gd_size + (gt_size * gt_count); | |
751 | header.grain_offset = | |
752 | ((header.gd_offset + gd_size + (gt_size * gt_count) + | |
753 | header.granularity - 1) / header.granularity) * | |
754 | header.granularity; | |
755 | ||
756 | header.desc_offset = cpu_to_le64(header.desc_offset); | |
757 | header.desc_size = cpu_to_le64(header.desc_size); | |
758 | header.rgd_offset = cpu_to_le64(header.rgd_offset); | |
759 | header.gd_offset = cpu_to_le64(header.gd_offset); | |
760 | header.grain_offset = cpu_to_le64(header.grain_offset); | |
761 | ||
762 | header.check_bytes[0] = 0xa; | |
763 | header.check_bytes[1] = 0x20; | |
764 | header.check_bytes[2] = 0xd; | |
765 | header.check_bytes[3] = 0xa; | |
3b46e624 TS |
766 | |
767 | /* write all the data */ | |
8979b227 FB |
768 | write(fd, &magic, sizeof(magic)); |
769 | write(fd, &header, sizeof(header)); | |
770 | ||
771 | ftruncate(fd, header.grain_offset << 9); | |
772 | ||
773 | /* write grain directory */ | |
774 | lseek(fd, le64_to_cpu(header.rgd_offset) << 9, SEEK_SET); | |
775 | for (i = 0, tmp = header.rgd_offset + gd_size; | |
776 | i < gt_count; i++, tmp += gt_size) | |
777 | write(fd, &tmp, sizeof(tmp)); | |
3b46e624 | 778 | |
8979b227 FB |
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 | write(fd, &tmp, sizeof(tmp)); | |
784 | ||
785 | /* compose the descriptor */ | |
786 | real_filename = filename; | |
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 | if ((temp_str = strrchr(real_filename, ':')) != NULL) | |
792 | real_filename = temp_str + 1; | |
793 | sprintf(desc, desc_template, time(NULL), (unsigned long)total_size, | |
ec36ba14 | 794 | real_filename, (flags & BLOCK_FLAG_COMPAT6 ? 6 : 4), total_size / (63 * 16)); |
8979b227 FB |
795 | |
796 | /* write the descriptor */ | |
797 | lseek(fd, le64_to_cpu(header.desc_offset) << 9, SEEK_SET); | |
798 | write(fd, desc, strlen(desc)); | |
799 | ||
800 | close(fd); | |
801 | return 0; | |
802 | } | |
803 | ||
e2731add | 804 | static void vmdk_close(BlockDriverState *bs) |
ea2384d3 FB |
805 | { |
806 | BDRVVmdkState *s = bs->opaque; | |
5f4da8c0 | 807 | |
ea2384d3 FB |
808 | qemu_free(s->l1_table); |
809 | qemu_free(s->l2_cache); | |
5f4da8c0 TS |
810 | // try to close parent image, if exist |
811 | vmdk_parent_close(s->hd); | |
5cbdd273 | 812 | bdrv_delete(s->hd); |
ea2384d3 FB |
813 | } |
814 | ||
7a6cba61 PB |
815 | static void vmdk_flush(BlockDriverState *bs) |
816 | { | |
817 | BDRVVmdkState *s = bs->opaque; | |
5f4da8c0 | 818 | bdrv_flush(s->hd); |
7a6cba61 PB |
819 | } |
820 | ||
ea2384d3 FB |
821 | BlockDriver bdrv_vmdk = { |
822 | "vmdk", | |
823 | sizeof(BDRVVmdkState), | |
824 | vmdk_probe, | |
825 | vmdk_open, | |
826 | vmdk_read, | |
827 | vmdk_write, | |
828 | vmdk_close, | |
8979b227 | 829 | vmdk_create, |
7a6cba61 | 830 | vmdk_flush, |
ea2384d3 FB |
831 | vmdk_is_allocated, |
832 | }; |