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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 | 27 | #include "block_int.h" |
5efa9d5a | 28 | #include "module.h" |
ea2384d3 | 29 | |
ea2384d3 FB |
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]; | |
ff1afc72 | 59 | } __attribute__((packed)) VMDK4Header; |
ea2384d3 FB |
60 | |
61 | #define L2_CACHE_SIZE 16 | |
62 | ||
63 | typedef struct BDRVVmdkState { | |
5f4da8c0 | 64 | BlockDriverState *hd; |
ea2384d3 | 65 | int64_t l1_table_offset; |
ff1afc72 | 66 | int64_t l1_backup_table_offset; |
ea2384d3 | 67 | uint32_t *l1_table; |
ff1afc72 | 68 | uint32_t *l1_backup_table; |
ea2384d3 FB |
69 | unsigned int l1_size; |
70 | uint32_t l1_entry_sectors; | |
71 | ||
72 | unsigned int l2_size; | |
73 | uint32_t *l2_cache; | |
74 | uint32_t l2_cache_offsets[L2_CACHE_SIZE]; | |
75 | uint32_t l2_cache_counts[L2_CACHE_SIZE]; | |
76 | ||
77 | unsigned int cluster_sectors; | |
5f4da8c0 | 78 | uint32_t parent_cid; |
630530a6 | 79 | int is_parent; |
ea2384d3 FB |
80 | } BDRVVmdkState; |
81 | ||
630530a6 TS |
82 | typedef struct VmdkMetaData { |
83 | uint32_t offset; | |
84 | unsigned int l1_index; | |
85 | unsigned int l2_index; | |
86 | unsigned int l2_offset; | |
87 | int valid; | |
88 | } VmdkMetaData; | |
89 | ||
90 | typedef struct ActiveBDRVState{ | |
91 | BlockDriverState *hd; // active image handler | |
92 | uint64_t cluster_offset; // current write offset | |
93 | }ActiveBDRVState; | |
94 | ||
95 | static ActiveBDRVState activeBDRV; | |
96 | ||
97 | ||
ea2384d3 FB |
98 | static int vmdk_probe(const uint8_t *buf, int buf_size, const char *filename) |
99 | { | |
100 | uint32_t magic; | |
101 | ||
102 | if (buf_size < 4) | |
103 | return 0; | |
104 | magic = be32_to_cpu(*(uint32_t *)buf); | |
105 | if (magic == VMDK3_MAGIC || | |
106 | magic == VMDK4_MAGIC) | |
107 | return 100; | |
108 | else | |
109 | return 0; | |
110 | } | |
111 | ||
5f4da8c0 TS |
112 | #define CHECK_CID 1 |
113 | ||
3b46e624 | 114 | #define SECTOR_SIZE 512 |
5f4da8c0 | 115 | #define DESC_SIZE 20*SECTOR_SIZE // 20 sectors of 512 bytes each |
5fafdf24 | 116 | #define HEADER_SIZE 512 // first sector of 512 bytes |
5f4da8c0 TS |
117 | |
118 | static uint32_t vmdk_read_cid(BlockDriverState *bs, int parent) | |
ea2384d3 FB |
119 | { |
120 | BDRVVmdkState *s = bs->opaque; | |
5f4da8c0 TS |
121 | char desc[DESC_SIZE]; |
122 | uint32_t cid; | |
7ccfb2eb | 123 | const char *p_name, *cid_str; |
5f4da8c0 TS |
124 | size_t cid_str_size; |
125 | ||
126 | /* the descriptor offset = 0x200 */ | |
127 | if (bdrv_pread(s->hd, 0x200, desc, DESC_SIZE) != DESC_SIZE) | |
128 | return 0; | |
129 | ||
130 | if (parent) { | |
131 | cid_str = "parentCID"; | |
132 | cid_str_size = sizeof("parentCID"); | |
133 | } else { | |
134 | cid_str = "CID"; | |
135 | cid_str_size = sizeof("CID"); | |
136 | } | |
137 | ||
511d2b14 | 138 | if ((p_name = strstr(desc,cid_str)) != NULL) { |
5f4da8c0 TS |
139 | p_name += cid_str_size; |
140 | sscanf(p_name,"%x",&cid); | |
141 | } | |
142 | ||
143 | return cid; | |
144 | } | |
145 | ||
146 | static int vmdk_write_cid(BlockDriverState *bs, uint32_t cid) | |
147 | { | |
148 | BDRVVmdkState *s = bs->opaque; | |
149 | char desc[DESC_SIZE], tmp_desc[DESC_SIZE]; | |
150 | char *p_name, *tmp_str; | |
151 | ||
152 | /* the descriptor offset = 0x200 */ | |
153 | if (bdrv_pread(s->hd, 0x200, desc, DESC_SIZE) != DESC_SIZE) | |
154 | return -1; | |
155 | ||
156 | tmp_str = strstr(desc,"parentCID"); | |
363a37d5 | 157 | pstrcpy(tmp_desc, sizeof(tmp_desc), tmp_str); |
511d2b14 | 158 | if ((p_name = strstr(desc,"CID")) != NULL) { |
5f4da8c0 | 159 | p_name += sizeof("CID"); |
363a37d5 BS |
160 | snprintf(p_name, sizeof(desc) - (p_name - desc), "%x\n", cid); |
161 | pstrcat(desc, sizeof(desc), tmp_desc); | |
5f4da8c0 TS |
162 | } |
163 | ||
164 | if (bdrv_pwrite(s->hd, 0x200, desc, DESC_SIZE) != DESC_SIZE) | |
165 | return -1; | |
166 | return 0; | |
167 | } | |
168 | ||
169 | static int vmdk_is_cid_valid(BlockDriverState *bs) | |
170 | { | |
171 | #ifdef CHECK_CID | |
172 | BDRVVmdkState *s = bs->opaque; | |
b171271a | 173 | BlockDriverState *p_bs = bs->backing_hd; |
5f4da8c0 TS |
174 | uint32_t cur_pcid; |
175 | ||
176 | if (p_bs) { | |
177 | cur_pcid = vmdk_read_cid(p_bs,0); | |
178 | if (s->parent_cid != cur_pcid) | |
179 | // CID not valid | |
180 | return 0; | |
181 | } | |
182 | #endif | |
183 | // CID valid | |
184 | return 1; | |
185 | } | |
186 | ||
187 | static int vmdk_snapshot_create(const char *filename, const char *backing_file) | |
188 | { | |
189 | int snp_fd, p_fd; | |
53c2e716 | 190 | int ret; |
5f4da8c0 | 191 | uint32_t p_cid; |
5fafdf24 | 192 | char *p_name, *gd_buf, *rgd_buf; |
5f4da8c0 TS |
193 | const char *real_filename, *temp_str; |
194 | VMDK4Header header; | |
195 | uint32_t gde_entries, gd_size; | |
196 | int64_t gd_offset, rgd_offset, capacity, gt_size; | |
197 | char p_desc[DESC_SIZE], s_desc[DESC_SIZE], hdr[HEADER_SIZE]; | |
7ccfb2eb | 198 | static const char desc_template[] = |
5f4da8c0 TS |
199 | "# Disk DescriptorFile\n" |
200 | "version=1\n" | |
201 | "CID=%x\n" | |
202 | "parentCID=%x\n" | |
203 | "createType=\"monolithicSparse\"\n" | |
204 | "parentFileNameHint=\"%s\"\n" | |
205 | "\n" | |
206 | "# Extent description\n" | |
7ccfb2eb | 207 | "RW %u SPARSE \"%s\"\n" |
5f4da8c0 TS |
208 | "\n" |
209 | "# The Disk Data Base \n" | |
210 | "#DDB\n" | |
211 | "\n"; | |
212 | ||
213 | snp_fd = open(filename, O_RDWR | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, 0644); | |
214 | if (snp_fd < 0) | |
53c2e716 | 215 | return -errno; |
5f4da8c0 TS |
216 | p_fd = open(backing_file, O_RDONLY | O_BINARY | O_LARGEFILE); |
217 | if (p_fd < 0) { | |
218 | close(snp_fd); | |
53c2e716 | 219 | return -errno; |
5f4da8c0 TS |
220 | } |
221 | ||
222 | /* read the header */ | |
53c2e716 JQ |
223 | if (lseek(p_fd, 0x0, SEEK_SET) == -1) { |
224 | ret = -errno; | |
5f4da8c0 | 225 | goto fail; |
53c2e716 JQ |
226 | } |
227 | if (read(p_fd, hdr, HEADER_SIZE) != HEADER_SIZE) { | |
228 | ret = -errno; | |
5f4da8c0 | 229 | goto fail; |
53c2e716 | 230 | } |
5f4da8c0 TS |
231 | |
232 | /* write the header */ | |
53c2e716 JQ |
233 | if (lseek(snp_fd, 0x0, SEEK_SET) == -1) { |
234 | ret = -errno; | |
5f4da8c0 | 235 | goto fail; |
53c2e716 JQ |
236 | } |
237 | if (write(snp_fd, hdr, HEADER_SIZE) == -1) { | |
238 | ret = -errno; | |
5f4da8c0 | 239 | goto fail; |
53c2e716 | 240 | } |
5f4da8c0 TS |
241 | |
242 | memset(&header, 0, sizeof(header)); | |
243 | memcpy(&header,&hdr[4], sizeof(header)); // skip the VMDK4_MAGIC | |
244 | ||
53c2e716 JQ |
245 | if (ftruncate(snp_fd, header.grain_offset << 9)) { |
246 | ret = -errno; | |
1640366c | 247 | goto fail; |
53c2e716 | 248 | } |
5f4da8c0 | 249 | /* the descriptor offset = 0x200 */ |
53c2e716 JQ |
250 | if (lseek(p_fd, 0x200, SEEK_SET) == -1) { |
251 | ret = -errno; | |
5f4da8c0 | 252 | goto fail; |
53c2e716 JQ |
253 | } |
254 | if (read(p_fd, p_desc, DESC_SIZE) != DESC_SIZE) { | |
255 | ret = -errno; | |
5f4da8c0 | 256 | goto fail; |
53c2e716 | 257 | } |
5f4da8c0 | 258 | |
511d2b14 | 259 | if ((p_name = strstr(p_desc,"CID")) != NULL) { |
5f4da8c0 TS |
260 | p_name += sizeof("CID"); |
261 | sscanf(p_name,"%x",&p_cid); | |
262 | } | |
263 | ||
264 | real_filename = filename; | |
265 | if ((temp_str = strrchr(real_filename, '\\')) != NULL) | |
266 | real_filename = temp_str + 1; | |
267 | if ((temp_str = strrchr(real_filename, '/')) != NULL) | |
268 | real_filename = temp_str + 1; | |
269 | if ((temp_str = strrchr(real_filename, ':')) != NULL) | |
270 | real_filename = temp_str + 1; | |
271 | ||
363a37d5 BS |
272 | snprintf(s_desc, sizeof(s_desc), desc_template, p_cid, p_cid, backing_file, |
273 | (uint32_t)header.capacity, real_filename); | |
5f4da8c0 TS |
274 | |
275 | /* write the descriptor */ | |
53c2e716 JQ |
276 | if (lseek(snp_fd, 0x200, SEEK_SET) == -1) { |
277 | ret = -errno; | |
5f4da8c0 | 278 | goto fail; |
53c2e716 JQ |
279 | } |
280 | if (write(snp_fd, s_desc, strlen(s_desc)) == -1) { | |
281 | ret = -errno; | |
5f4da8c0 | 282 | goto fail; |
53c2e716 | 283 | } |
ea2384d3 | 284 | |
5f4da8c0 TS |
285 | gd_offset = header.gd_offset * SECTOR_SIZE; // offset of GD table |
286 | rgd_offset = header.rgd_offset * SECTOR_SIZE; // offset of RGD table | |
287 | capacity = header.capacity * SECTOR_SIZE; // Extent size | |
288 | /* | |
289 | * Each GDE span 32M disk, means: | |
290 | * 512 GTE per GT, each GTE points to grain | |
291 | */ | |
292 | gt_size = (int64_t)header.num_gtes_per_gte * header.granularity * SECTOR_SIZE; | |
53c2e716 JQ |
293 | if (!gt_size) { |
294 | ret = -EINVAL; | |
5f4da8c0 | 295 | goto fail; |
53c2e716 | 296 | } |
5fafdf24 | 297 | gde_entries = (uint32_t)(capacity / gt_size); // number of gde/rgde |
5f4da8c0 TS |
298 | gd_size = gde_entries * sizeof(uint32_t); |
299 | ||
300 | /* write RGD */ | |
301 | rgd_buf = qemu_malloc(gd_size); | |
53c2e716 JQ |
302 | if (lseek(p_fd, rgd_offset, SEEK_SET) == -1) { |
303 | ret = -errno; | |
5f4da8c0 | 304 | goto fail_rgd; |
53c2e716 JQ |
305 | } |
306 | if (read(p_fd, rgd_buf, gd_size) != gd_size) { | |
307 | ret = -errno; | |
5f4da8c0 | 308 | goto fail_rgd; |
53c2e716 JQ |
309 | } |
310 | if (lseek(snp_fd, rgd_offset, SEEK_SET) == -1) { | |
311 | ret = -errno; | |
5f4da8c0 | 312 | goto fail_rgd; |
53c2e716 JQ |
313 | } |
314 | if (write(snp_fd, rgd_buf, gd_size) == -1) { | |
315 | ret = -errno; | |
5f4da8c0 | 316 | goto fail_rgd; |
53c2e716 | 317 | } |
5f4da8c0 TS |
318 | |
319 | /* write GD */ | |
320 | gd_buf = qemu_malloc(gd_size); | |
53c2e716 JQ |
321 | if (lseek(p_fd, gd_offset, SEEK_SET) == -1) { |
322 | ret = -errno; | |
5f4da8c0 | 323 | goto fail_gd; |
53c2e716 JQ |
324 | } |
325 | if (read(p_fd, gd_buf, gd_size) != gd_size) { | |
326 | ret = -errno; | |
5f4da8c0 | 327 | goto fail_gd; |
53c2e716 JQ |
328 | } |
329 | if (lseek(snp_fd, gd_offset, SEEK_SET) == -1) { | |
330 | ret = -errno; | |
5f4da8c0 | 331 | goto fail_gd; |
53c2e716 JQ |
332 | } |
333 | if (write(snp_fd, gd_buf, gd_size) == -1) { | |
334 | ret = -errno; | |
5f4da8c0 | 335 | goto fail_gd; |
53c2e716 | 336 | } |
5f4da8c0 | 337 | qemu_free(gd_buf); |
a161329b | 338 | qemu_free(rgd_buf); |
5f4da8c0 TS |
339 | |
340 | close(p_fd); | |
341 | close(snp_fd); | |
342 | return 0; | |
343 | ||
344 | fail_gd: | |
345 | qemu_free(gd_buf); | |
3b46e624 | 346 | fail_rgd: |
5f4da8c0 TS |
347 | qemu_free(rgd_buf); |
348 | fail: | |
349 | close(p_fd); | |
350 | close(snp_fd); | |
53c2e716 | 351 | return ret; |
5f4da8c0 TS |
352 | } |
353 | ||
354 | static void vmdk_parent_close(BlockDriverState *bs) | |
355 | { | |
356 | if (bs->backing_hd) | |
357 | bdrv_close(bs->backing_hd); | |
358 | } | |
359 | ||
b1d8e52e | 360 | static int parent_open = 0; |
5f4da8c0 TS |
361 | static int vmdk_parent_open(BlockDriverState *bs, const char * filename) |
362 | { | |
363 | BDRVVmdkState *s = bs->opaque; | |
5fafdf24 | 364 | char *p_name; |
5f4da8c0 TS |
365 | char desc[DESC_SIZE]; |
366 | char parent_img_name[1024]; | |
367 | ||
368 | /* the descriptor offset = 0x200 */ | |
369 | if (bdrv_pread(s->hd, 0x200, desc, DESC_SIZE) != DESC_SIZE) | |
370 | return -1; | |
371 | ||
511d2b14 | 372 | if ((p_name = strstr(desc,"parentFileNameHint")) != NULL) { |
5f4da8c0 TS |
373 | char *end_name; |
374 | struct stat file_buf; | |
375 | ||
376 | p_name += sizeof("parentFileNameHint") + 1; | |
511d2b14 | 377 | if ((end_name = strchr(p_name,'\"')) == NULL) |
5f4da8c0 | 378 | return -1; |
b171271a | 379 | if ((end_name - p_name) > sizeof (bs->backing_file) - 1) |
b34d259a | 380 | return -1; |
3b46e624 | 381 | |
b171271a KW |
382 | pstrcpy(bs->backing_file, end_name - p_name + 1, p_name); |
383 | if (stat(bs->backing_file, &file_buf) != 0) { | |
5f4da8c0 | 384 | path_combine(parent_img_name, sizeof(parent_img_name), |
b171271a | 385 | filename, bs->backing_file); |
5f4da8c0 | 386 | } else { |
363a37d5 | 387 | pstrcpy(parent_img_name, sizeof(parent_img_name), |
b171271a | 388 | bs->backing_file); |
5f4da8c0 TS |
389 | } |
390 | ||
b171271a KW |
391 | bs->backing_hd = bdrv_new(""); |
392 | if (!bs->backing_hd) { | |
5f4da8c0 TS |
393 | failure: |
394 | bdrv_close(s->hd); | |
ff1afc72 | 395 | return -1; |
5f4da8c0 | 396 | } |
630530a6 | 397 | parent_open = 1; |
f5edb014 | 398 | if (bdrv_open(bs->backing_hd, parent_img_name, 0) < 0) |
5f4da8c0 | 399 | goto failure; |
630530a6 | 400 | parent_open = 0; |
ff1afc72 | 401 | } |
5f4da8c0 TS |
402 | |
403 | return 0; | |
404 | } | |
405 | ||
406 | static int vmdk_open(BlockDriverState *bs, const char *filename, int flags) | |
407 | { | |
408 | BDRVVmdkState *s = bs->opaque; | |
409 | uint32_t magic; | |
410 | int l1_size, i, ret; | |
411 | ||
f5edb014 NS |
412 | if (parent_open) { |
413 | /* Parent must be opened as RO, no RDWR. */ | |
414 | flags = 0; | |
415 | } | |
630530a6 | 416 | |
b5eff355 | 417 | ret = bdrv_file_open(&s->hd, filename, flags); |
5f4da8c0 TS |
418 | if (ret < 0) |
419 | return ret; | |
420 | if (bdrv_pread(s->hd, 0, &magic, sizeof(magic)) != sizeof(magic)) | |
ea2384d3 | 421 | goto fail; |
5f4da8c0 | 422 | |
7143c62c | 423 | magic = be32_to_cpu(magic); |
ea2384d3 FB |
424 | if (magic == VMDK3_MAGIC) { |
425 | VMDK3Header header; | |
5f4da8c0 TS |
426 | |
427 | if (bdrv_pread(s->hd, sizeof(magic), &header, sizeof(header)) != sizeof(header)) | |
ea2384d3 FB |
428 | goto fail; |
429 | s->cluster_sectors = le32_to_cpu(header.granularity); | |
430 | s->l2_size = 1 << 9; | |
431 | s->l1_size = 1 << 6; | |
432 | bs->total_sectors = le32_to_cpu(header.disk_sectors); | |
ff1afc72 FB |
433 | s->l1_table_offset = le32_to_cpu(header.l1dir_offset) << 9; |
434 | s->l1_backup_table_offset = 0; | |
ea2384d3 FB |
435 | s->l1_entry_sectors = s->l2_size * s->cluster_sectors; |
436 | } else if (magic == VMDK4_MAGIC) { | |
437 | VMDK4Header header; | |
5f4da8c0 TS |
438 | |
439 | if (bdrv_pread(s->hd, sizeof(magic), &header, sizeof(header)) != sizeof(header)) | |
ea2384d3 | 440 | goto fail; |
bd6ea3c8 FB |
441 | bs->total_sectors = le64_to_cpu(header.capacity); |
442 | s->cluster_sectors = le64_to_cpu(header.granularity); | |
ea2384d3 FB |
443 | s->l2_size = le32_to_cpu(header.num_gtes_per_gte); |
444 | s->l1_entry_sectors = s->l2_size * s->cluster_sectors; | |
445 | if (s->l1_entry_sectors <= 0) | |
446 | goto fail; | |
5fafdf24 | 447 | s->l1_size = (bs->total_sectors + s->l1_entry_sectors - 1) |
ea2384d3 | 448 | / s->l1_entry_sectors; |
ff1afc72 FB |
449 | s->l1_table_offset = le64_to_cpu(header.rgd_offset) << 9; |
450 | s->l1_backup_table_offset = le64_to_cpu(header.gd_offset) << 9; | |
5f4da8c0 | 451 | |
630530a6 TS |
452 | if (parent_open) |
453 | s->is_parent = 1; | |
454 | else | |
455 | s->is_parent = 0; | |
456 | ||
5f4da8c0 TS |
457 | // try to open parent images, if exist |
458 | if (vmdk_parent_open(bs, filename) != 0) | |
459 | goto fail; | |
460 | // write the CID once after the image creation | |
461 | s->parent_cid = vmdk_read_cid(bs,1); | |
ea2384d3 FB |
462 | } else { |
463 | goto fail; | |
464 | } | |
5f4da8c0 | 465 | |
ea2384d3 FB |
466 | /* read the L1 table */ |
467 | l1_size = s->l1_size * sizeof(uint32_t); | |
468 | s->l1_table = qemu_malloc(l1_size); | |
5f4da8c0 | 469 | if (bdrv_pread(s->hd, s->l1_table_offset, s->l1_table, l1_size) != l1_size) |
ea2384d3 FB |
470 | goto fail; |
471 | for(i = 0; i < s->l1_size; i++) { | |
472 | le32_to_cpus(&s->l1_table[i]); | |
473 | } | |
474 | ||
ff1afc72 FB |
475 | if (s->l1_backup_table_offset) { |
476 | s->l1_backup_table = qemu_malloc(l1_size); | |
5f4da8c0 | 477 | if (bdrv_pread(s->hd, s->l1_backup_table_offset, s->l1_backup_table, l1_size) != l1_size) |
ff1afc72 FB |
478 | goto fail; |
479 | for(i = 0; i < s->l1_size; i++) { | |
480 | le32_to_cpus(&s->l1_backup_table[i]); | |
481 | } | |
482 | } | |
483 | ||
ea2384d3 | 484 | s->l2_cache = qemu_malloc(s->l2_size * L2_CACHE_SIZE * sizeof(uint32_t)); |
ea2384d3 FB |
485 | return 0; |
486 | fail: | |
ff1afc72 | 487 | qemu_free(s->l1_backup_table); |
ea2384d3 FB |
488 | qemu_free(s->l1_table); |
489 | qemu_free(s->l2_cache); | |
5f4da8c0 | 490 | bdrv_delete(s->hd); |
ea2384d3 FB |
491 | return -1; |
492 | } | |
493 | ||
630530a6 TS |
494 | static uint64_t get_cluster_offset(BlockDriverState *bs, VmdkMetaData *m_data, |
495 | uint64_t offset, int allocate); | |
5f4da8c0 TS |
496 | |
497 | static int get_whole_cluster(BlockDriverState *bs, uint64_t cluster_offset, | |
498 | uint64_t offset, int allocate) | |
499 | { | |
500 | uint64_t parent_cluster_offset; | |
501 | BDRVVmdkState *s = bs->opaque; | |
502 | uint8_t whole_grain[s->cluster_sectors*512]; // 128 sectors * 512 bytes each = grain size 64KB | |
503 | ||
504 | // we will be here if it's first write on non-exist grain(cluster). | |
505 | // try to read from parent image, if exist | |
b171271a KW |
506 | if (bs->backing_hd) { |
507 | BDRVVmdkState *ps = bs->backing_hd->opaque; | |
5f4da8c0 TS |
508 | |
509 | if (!vmdk_is_cid_valid(bs)) | |
510 | return -1; | |
5f4da8c0 | 511 | |
b171271a KW |
512 | parent_cluster_offset = get_cluster_offset(bs->backing_hd, NULL, |
513 | offset, allocate); | |
630530a6 TS |
514 | |
515 | if (parent_cluster_offset) { | |
516 | BDRVVmdkState *act_s = activeBDRV.hd->opaque; | |
517 | ||
518 | if (bdrv_pread(ps->hd, parent_cluster_offset, whole_grain, ps->cluster_sectors*512) != ps->cluster_sectors*512) | |
519 | return -1; | |
520 | ||
521 | //Write grain only into the active image | |
522 | if (bdrv_pwrite(act_s->hd, activeBDRV.cluster_offset << 9, whole_grain, sizeof(whole_grain)) != sizeof(whole_grain)) | |
523 | return -1; | |
524 | } | |
525 | } | |
526 | return 0; | |
527 | } | |
528 | ||
529 | static int vmdk_L2update(BlockDriverState *bs, VmdkMetaData *m_data) | |
530 | { | |
531 | BDRVVmdkState *s = bs->opaque; | |
532 | ||
533 | /* update L2 table */ | |
534 | if (bdrv_pwrite(s->hd, ((int64_t)m_data->l2_offset * 512) + (m_data->l2_index * sizeof(m_data->offset)), | |
535 | &(m_data->offset), sizeof(m_data->offset)) != sizeof(m_data->offset)) | |
536 | return -1; | |
537 | /* update backup L2 table */ | |
538 | if (s->l1_backup_table_offset != 0) { | |
539 | m_data->l2_offset = s->l1_backup_table[m_data->l1_index]; | |
540 | if (bdrv_pwrite(s->hd, ((int64_t)m_data->l2_offset * 512) + (m_data->l2_index * sizeof(m_data->offset)), | |
541 | &(m_data->offset), sizeof(m_data->offset)) != sizeof(m_data->offset)) | |
5f4da8c0 TS |
542 | return -1; |
543 | } | |
630530a6 | 544 | |
5f4da8c0 TS |
545 | return 0; |
546 | } | |
547 | ||
630530a6 | 548 | static uint64_t get_cluster_offset(BlockDriverState *bs, VmdkMetaData *m_data, |
ff1afc72 | 549 | uint64_t offset, int allocate) |
ea2384d3 FB |
550 | { |
551 | BDRVVmdkState *s = bs->opaque; | |
552 | unsigned int l1_index, l2_offset, l2_index; | |
553 | int min_index, i, j; | |
630530a6 | 554 | uint32_t min_count, *l2_table, tmp = 0; |
ea2384d3 | 555 | uint64_t cluster_offset; |
630530a6 TS |
556 | |
557 | if (m_data) | |
558 | m_data->valid = 0; | |
559 | ||
ea2384d3 FB |
560 | l1_index = (offset >> 9) / s->l1_entry_sectors; |
561 | if (l1_index >= s->l1_size) | |
562 | return 0; | |
563 | l2_offset = s->l1_table[l1_index]; | |
564 | if (!l2_offset) | |
565 | return 0; | |
ea2384d3 FB |
566 | for(i = 0; i < L2_CACHE_SIZE; i++) { |
567 | if (l2_offset == s->l2_cache_offsets[i]) { | |
568 | /* increment the hit count */ | |
569 | if (++s->l2_cache_counts[i] == 0xffffffff) { | |
570 | for(j = 0; j < L2_CACHE_SIZE; j++) { | |
571 | s->l2_cache_counts[j] >>= 1; | |
572 | } | |
573 | } | |
574 | l2_table = s->l2_cache + (i * s->l2_size); | |
575 | goto found; | |
576 | } | |
577 | } | |
578 | /* not found: load a new entry in the least used one */ | |
579 | min_index = 0; | |
580 | min_count = 0xffffffff; | |
581 | for(i = 0; i < L2_CACHE_SIZE; i++) { | |
582 | if (s->l2_cache_counts[i] < min_count) { | |
583 | min_count = s->l2_cache_counts[i]; | |
584 | min_index = i; | |
585 | } | |
586 | } | |
587 | l2_table = s->l2_cache + (min_index * s->l2_size); | |
5fafdf24 | 588 | if (bdrv_pread(s->hd, (int64_t)l2_offset * 512, l2_table, s->l2_size * sizeof(uint32_t)) != |
5f4da8c0 | 589 | s->l2_size * sizeof(uint32_t)) |
ea2384d3 | 590 | return 0; |
5f4da8c0 | 591 | |
ea2384d3 FB |
592 | s->l2_cache_offsets[min_index] = l2_offset; |
593 | s->l2_cache_counts[min_index] = 1; | |
594 | found: | |
595 | l2_index = ((offset >> 9) / s->cluster_sectors) % s->l2_size; | |
596 | cluster_offset = le32_to_cpu(l2_table[l2_index]); | |
630530a6 | 597 | |
ff1afc72 FB |
598 | if (!cluster_offset) { |
599 | if (!allocate) | |
600 | return 0; | |
630530a6 TS |
601 | // Avoid the L2 tables update for the images that have snapshots. |
602 | if (!s->is_parent) { | |
49140a77 | 603 | cluster_offset = bdrv_getlength(s->hd); |
630530a6 TS |
604 | bdrv_truncate(s->hd, cluster_offset + (s->cluster_sectors << 9)); |
605 | ||
606 | cluster_offset >>= 9; | |
607 | tmp = cpu_to_le32(cluster_offset); | |
608 | l2_table[l2_index] = tmp; | |
609 | // Save the active image state | |
610 | activeBDRV.cluster_offset = cluster_offset; | |
611 | activeBDRV.hd = bs; | |
ff1afc72 | 612 | } |
630530a6 TS |
613 | /* First of all we write grain itself, to avoid race condition |
614 | * that may to corrupt the image. | |
615 | * This problem may occur because of insufficient space on host disk | |
616 | * or inappropriate VM shutdown. | |
617 | */ | |
5f4da8c0 TS |
618 | if (get_whole_cluster(bs, cluster_offset, offset, allocate) == -1) |
619 | return 0; | |
630530a6 TS |
620 | |
621 | if (m_data) { | |
622 | m_data->offset = tmp; | |
623 | m_data->l1_index = l1_index; | |
624 | m_data->l2_index = l2_index; | |
625 | m_data->l2_offset = l2_offset; | |
626 | m_data->valid = 1; | |
627 | } | |
ff1afc72 | 628 | } |
ea2384d3 FB |
629 | cluster_offset <<= 9; |
630 | return cluster_offset; | |
631 | } | |
632 | ||
5fafdf24 | 633 | static int vmdk_is_allocated(BlockDriverState *bs, int64_t sector_num, |
ea2384d3 FB |
634 | int nb_sectors, int *pnum) |
635 | { | |
636 | BDRVVmdkState *s = bs->opaque; | |
637 | int index_in_cluster, n; | |
638 | uint64_t cluster_offset; | |
639 | ||
630530a6 | 640 | cluster_offset = get_cluster_offset(bs, NULL, sector_num << 9, 0); |
ea2384d3 FB |
641 | index_in_cluster = sector_num % s->cluster_sectors; |
642 | n = s->cluster_sectors - index_in_cluster; | |
643 | if (n > nb_sectors) | |
644 | n = nb_sectors; | |
645 | *pnum = n; | |
646 | return (cluster_offset != 0); | |
647 | } | |
648 | ||
5fafdf24 | 649 | static int vmdk_read(BlockDriverState *bs, int64_t sector_num, |
ea2384d3 FB |
650 | uint8_t *buf, int nb_sectors) |
651 | { | |
652 | BDRVVmdkState *s = bs->opaque; | |
5f4da8c0 | 653 | int index_in_cluster, n, ret; |
ea2384d3 | 654 | uint64_t cluster_offset; |
5f4da8c0 | 655 | |
ea2384d3 | 656 | while (nb_sectors > 0) { |
630530a6 | 657 | cluster_offset = get_cluster_offset(bs, NULL, sector_num << 9, 0); |
ea2384d3 FB |
658 | index_in_cluster = sector_num % s->cluster_sectors; |
659 | n = s->cluster_sectors - index_in_cluster; | |
660 | if (n > nb_sectors) | |
661 | n = nb_sectors; | |
662 | if (!cluster_offset) { | |
5f4da8c0 | 663 | // try to read from parent image, if exist |
b171271a | 664 | if (bs->backing_hd) { |
5f4da8c0 TS |
665 | if (!vmdk_is_cid_valid(bs)) |
666 | return -1; | |
b171271a | 667 | ret = bdrv_read(bs->backing_hd, sector_num, buf, n); |
5f4da8c0 TS |
668 | if (ret < 0) |
669 | return -1; | |
670 | } else { | |
671 | memset(buf, 0, 512 * n); | |
672 | } | |
ea2384d3 | 673 | } else { |
5f4da8c0 | 674 | if(bdrv_pread(s->hd, cluster_offset + index_in_cluster * 512, buf, n * 512) != n * 512) |
ea2384d3 FB |
675 | return -1; |
676 | } | |
677 | nb_sectors -= n; | |
678 | sector_num += n; | |
679 | buf += n * 512; | |
680 | } | |
681 | return 0; | |
682 | } | |
683 | ||
5fafdf24 | 684 | static int vmdk_write(BlockDriverState *bs, int64_t sector_num, |
ea2384d3 FB |
685 | const uint8_t *buf, int nb_sectors) |
686 | { | |
ff1afc72 | 687 | BDRVVmdkState *s = bs->opaque; |
630530a6 | 688 | VmdkMetaData m_data; |
5f4da8c0 | 689 | int index_in_cluster, n; |
ff1afc72 | 690 | uint64_t cluster_offset; |
5f4da8c0 | 691 | static int cid_update = 0; |
ff1afc72 | 692 | |
630530a6 TS |
693 | if (sector_num > bs->total_sectors) { |
694 | fprintf(stderr, | |
92868412 JM |
695 | "(VMDK) Wrong offset: sector_num=0x%" PRIx64 |
696 | " total_sectors=0x%" PRIx64 "\n", | |
630530a6 TS |
697 | sector_num, bs->total_sectors); |
698 | return -1; | |
699 | } | |
700 | ||
ff1afc72 FB |
701 | while (nb_sectors > 0) { |
702 | index_in_cluster = sector_num & (s->cluster_sectors - 1); | |
703 | n = s->cluster_sectors - index_in_cluster; | |
704 | if (n > nb_sectors) | |
705 | n = nb_sectors; | |
630530a6 | 706 | cluster_offset = get_cluster_offset(bs, &m_data, sector_num << 9, 1); |
ff1afc72 FB |
707 | if (!cluster_offset) |
708 | return -1; | |
630530a6 | 709 | |
5f4da8c0 | 710 | if (bdrv_pwrite(s->hd, cluster_offset + index_in_cluster * 512, buf, n * 512) != n * 512) |
ff1afc72 | 711 | return -1; |
630530a6 TS |
712 | if (m_data.valid) { |
713 | /* update L2 tables */ | |
714 | if (vmdk_L2update(bs, &m_data) == -1) | |
715 | return -1; | |
716 | } | |
ff1afc72 FB |
717 | nb_sectors -= n; |
718 | sector_num += n; | |
719 | buf += n * 512; | |
5f4da8c0 TS |
720 | |
721 | // update CID on the first write every time the virtual disk is opened | |
722 | if (!cid_update) { | |
723 | vmdk_write_cid(bs, time(NULL)); | |
724 | cid_update++; | |
725 | } | |
ff1afc72 FB |
726 | } |
727 | return 0; | |
ea2384d3 FB |
728 | } |
729 | ||
0e7e1989 | 730 | static int vmdk_create(const char *filename, QEMUOptionParameter *options) |
8979b227 FB |
731 | { |
732 | int fd, i; | |
733 | VMDK4Header header; | |
734 | uint32_t tmp, magic, grains, gd_size, gt_size, gt_count; | |
7ccfb2eb | 735 | static const char desc_template[] = |
8979b227 FB |
736 | "# Disk DescriptorFile\n" |
737 | "version=1\n" | |
738 | "CID=%x\n" | |
739 | "parentCID=ffffffff\n" | |
740 | "createType=\"monolithicSparse\"\n" | |
741 | "\n" | |
742 | "# Extent description\n" | |
7fd6d9fc | 743 | "RW %" PRId64 " SPARSE \"%s\"\n" |
8979b227 FB |
744 | "\n" |
745 | "# The Disk Data Base \n" | |
746 | "#DDB\n" | |
747 | "\n" | |
ec36ba14 | 748 | "ddb.virtualHWVersion = \"%d\"\n" |
7fd6d9fc | 749 | "ddb.geometry.cylinders = \"%" PRId64 "\"\n" |
8979b227 FB |
750 | "ddb.geometry.heads = \"16\"\n" |
751 | "ddb.geometry.sectors = \"63\"\n" | |
752 | "ddb.adapterType = \"ide\"\n"; | |
753 | char desc[1024]; | |
754 | const char *real_filename, *temp_str; | |
0e7e1989 KW |
755 | int64_t total_size = 0; |
756 | const char *backing_file = NULL; | |
757 | int flags = 0; | |
1640366c | 758 | int ret; |
0e7e1989 KW |
759 | |
760 | // Read out options | |
761 | while (options && options->name) { | |
762 | if (!strcmp(options->name, BLOCK_OPT_SIZE)) { | |
763 | total_size = options->value.n / 512; | |
764 | } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) { | |
765 | backing_file = options->value.s; | |
766 | } else if (!strcmp(options->name, BLOCK_OPT_COMPAT6)) { | |
767 | flags |= options->value.n ? BLOCK_FLAG_COMPAT6: 0; | |
768 | } | |
769 | options++; | |
770 | } | |
8979b227 FB |
771 | |
772 | /* XXX: add support for backing file */ | |
5f4da8c0 TS |
773 | if (backing_file) { |
774 | return vmdk_snapshot_create(filename, backing_file); | |
775 | } | |
8979b227 FB |
776 | |
777 | fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, | |
778 | 0644); | |
779 | if (fd < 0) | |
b781cce5 | 780 | return -errno; |
8979b227 FB |
781 | magic = cpu_to_be32(VMDK4_MAGIC); |
782 | memset(&header, 0, sizeof(header)); | |
783 | header.version = cpu_to_le32(1); | |
784 | header.flags = cpu_to_le32(3); /* ?? */ | |
785 | header.capacity = cpu_to_le64(total_size); | |
786 | header.granularity = cpu_to_le64(128); | |
787 | header.num_gtes_per_gte = cpu_to_le32(512); | |
788 | ||
789 | grains = (total_size + header.granularity - 1) / header.granularity; | |
790 | gt_size = ((header.num_gtes_per_gte * sizeof(uint32_t)) + 511) >> 9; | |
791 | gt_count = (grains + header.num_gtes_per_gte - 1) / header.num_gtes_per_gte; | |
792 | gd_size = (gt_count * sizeof(uint32_t) + 511) >> 9; | |
793 | ||
794 | header.desc_offset = 1; | |
795 | header.desc_size = 20; | |
796 | header.rgd_offset = header.desc_offset + header.desc_size; | |
797 | header.gd_offset = header.rgd_offset + gd_size + (gt_size * gt_count); | |
798 | header.grain_offset = | |
799 | ((header.gd_offset + gd_size + (gt_size * gt_count) + | |
800 | header.granularity - 1) / header.granularity) * | |
801 | header.granularity; | |
802 | ||
803 | header.desc_offset = cpu_to_le64(header.desc_offset); | |
804 | header.desc_size = cpu_to_le64(header.desc_size); | |
805 | header.rgd_offset = cpu_to_le64(header.rgd_offset); | |
806 | header.gd_offset = cpu_to_le64(header.gd_offset); | |
807 | header.grain_offset = cpu_to_le64(header.grain_offset); | |
808 | ||
809 | header.check_bytes[0] = 0xa; | |
810 | header.check_bytes[1] = 0x20; | |
811 | header.check_bytes[2] = 0xd; | |
812 | header.check_bytes[3] = 0xa; | |
3b46e624 TS |
813 | |
814 | /* write all the data */ | |
1640366c KS |
815 | ret = qemu_write_full(fd, &magic, sizeof(magic)); |
816 | if (ret != sizeof(magic)) { | |
b781cce5 | 817 | ret = -errno; |
1640366c KS |
818 | goto exit; |
819 | } | |
820 | ret = qemu_write_full(fd, &header, sizeof(header)); | |
821 | if (ret != sizeof(header)) { | |
b781cce5 | 822 | ret = -errno; |
1640366c KS |
823 | goto exit; |
824 | } | |
8979b227 | 825 | |
1640366c KS |
826 | ret = ftruncate(fd, header.grain_offset << 9); |
827 | if (ret < 0) { | |
b781cce5 | 828 | ret = -errno; |
1640366c KS |
829 | goto exit; |
830 | } | |
8979b227 FB |
831 | |
832 | /* write grain directory */ | |
833 | lseek(fd, le64_to_cpu(header.rgd_offset) << 9, SEEK_SET); | |
834 | for (i = 0, tmp = header.rgd_offset + gd_size; | |
1640366c KS |
835 | i < gt_count; i++, tmp += gt_size) { |
836 | ret = qemu_write_full(fd, &tmp, sizeof(tmp)); | |
837 | if (ret != sizeof(tmp)) { | |
b781cce5 | 838 | ret = -errno; |
1640366c KS |
839 | goto exit; |
840 | } | |
841 | } | |
3b46e624 | 842 | |
8979b227 FB |
843 | /* write backup grain directory */ |
844 | lseek(fd, le64_to_cpu(header.gd_offset) << 9, SEEK_SET); | |
845 | for (i = 0, tmp = header.gd_offset + gd_size; | |
1640366c KS |
846 | i < gt_count; i++, tmp += gt_size) { |
847 | ret = qemu_write_full(fd, &tmp, sizeof(tmp)); | |
848 | if (ret != sizeof(tmp)) { | |
b781cce5 | 849 | ret = -errno; |
1640366c KS |
850 | goto exit; |
851 | } | |
852 | } | |
8979b227 FB |
853 | |
854 | /* compose the descriptor */ | |
855 | real_filename = filename; | |
856 | if ((temp_str = strrchr(real_filename, '\\')) != NULL) | |
857 | real_filename = temp_str + 1; | |
858 | if ((temp_str = strrchr(real_filename, '/')) != NULL) | |
859 | real_filename = temp_str + 1; | |
860 | if ((temp_str = strrchr(real_filename, ':')) != NULL) | |
861 | real_filename = temp_str + 1; | |
7ccfb2eb | 862 | snprintf(desc, sizeof(desc), desc_template, (unsigned int)time(NULL), |
7fd6d9fc BS |
863 | total_size, real_filename, |
864 | (flags & BLOCK_FLAG_COMPAT6 ? 6 : 4), | |
865 | total_size / (int64_t)(63 * 16)); | |
8979b227 FB |
866 | |
867 | /* write the descriptor */ | |
868 | lseek(fd, le64_to_cpu(header.desc_offset) << 9, SEEK_SET); | |
1640366c KS |
869 | ret = qemu_write_full(fd, desc, strlen(desc)); |
870 | if (ret != strlen(desc)) { | |
b781cce5 | 871 | ret = -errno; |
1640366c KS |
872 | goto exit; |
873 | } | |
8979b227 | 874 | |
1640366c KS |
875 | ret = 0; |
876 | exit: | |
8979b227 | 877 | close(fd); |
1640366c | 878 | return ret; |
8979b227 FB |
879 | } |
880 | ||
e2731add | 881 | static void vmdk_close(BlockDriverState *bs) |
ea2384d3 FB |
882 | { |
883 | BDRVVmdkState *s = bs->opaque; | |
5f4da8c0 | 884 | |
ea2384d3 FB |
885 | qemu_free(s->l1_table); |
886 | qemu_free(s->l2_cache); | |
5f4da8c0 TS |
887 | // try to close parent image, if exist |
888 | vmdk_parent_close(s->hd); | |
5cbdd273 | 889 | bdrv_delete(s->hd); |
ea2384d3 FB |
890 | } |
891 | ||
7a6cba61 PB |
892 | static void vmdk_flush(BlockDriverState *bs) |
893 | { | |
894 | BDRVVmdkState *s = bs->opaque; | |
5f4da8c0 | 895 | bdrv_flush(s->hd); |
7a6cba61 PB |
896 | } |
897 | ||
0e7e1989 KW |
898 | |
899 | static QEMUOptionParameter vmdk_create_options[] = { | |
db08adf5 KW |
900 | { |
901 | .name = BLOCK_OPT_SIZE, | |
902 | .type = OPT_SIZE, | |
903 | .help = "Virtual disk size" | |
904 | }, | |
905 | { | |
906 | .name = BLOCK_OPT_BACKING_FILE, | |
907 | .type = OPT_STRING, | |
908 | .help = "File name of a base image" | |
909 | }, | |
910 | { | |
911 | .name = BLOCK_OPT_COMPAT6, | |
912 | .type = OPT_FLAG, | |
913 | .help = "VMDK version 6 image" | |
914 | }, | |
0e7e1989 KW |
915 | { NULL } |
916 | }; | |
917 | ||
5efa9d5a | 918 | static BlockDriver bdrv_vmdk = { |
e60f469c AJ |
919 | .format_name = "vmdk", |
920 | .instance_size = sizeof(BDRVVmdkState), | |
921 | .bdrv_probe = vmdk_probe, | |
922 | .bdrv_open = vmdk_open, | |
923 | .bdrv_read = vmdk_read, | |
924 | .bdrv_write = vmdk_write, | |
925 | .bdrv_close = vmdk_close, | |
926 | .bdrv_create = vmdk_create, | |
927 | .bdrv_flush = vmdk_flush, | |
928 | .bdrv_is_allocated = vmdk_is_allocated, | |
0e7e1989 KW |
929 | |
930 | .create_options = vmdk_create_options, | |
ea2384d3 | 931 | }; |
5efa9d5a AL |
932 | |
933 | static void bdrv_vmdk_init(void) | |
934 | { | |
935 | bdrv_register(&bdrv_vmdk); | |
936 | } | |
937 | ||
938 | block_init(bdrv_vmdk_init); |