root / block / vmdk.c @ b4b3ab14
History | View | Annotate | Download (31.6 kB)
1 |
/*
|
---|---|
2 |
* Block driver for the VMDK format
|
3 |
*
|
4 |
* Copyright (c) 2004 Fabrice Bellard
|
5 |
* Copyright (c) 2005 Filip Navara
|
6 |
*
|
7 |
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
8 |
* of this software and associated documentation files (the "Software"), to deal
|
9 |
* in the Software without restriction, including without limitation the rights
|
10 |
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
11 |
* copies of the Software, and to permit persons to whom the Software is
|
12 |
* furnished to do so, subject to the following conditions:
|
13 |
*
|
14 |
* The above copyright notice and this permission notice shall be included in
|
15 |
* all copies or substantial portions of the Software.
|
16 |
*
|
17 |
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
18 |
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
19 |
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
20 |
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
21 |
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
22 |
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
23 |
* THE SOFTWARE.
|
24 |
*/
|
25 |
|
26 |
#include "qemu-common.h" |
27 |
#include "block_int.h" |
28 |
#include "module.h" |
29 |
|
30 |
#define VMDK3_MAGIC (('C' << 24) | ('O' << 16) | ('W' << 8) | 'D') |
31 |
#define VMDK4_MAGIC (('K' << 24) | ('D' << 16) | ('M' << 8) | 'V') |
32 |
|
33 |
typedef struct { |
34 |
uint32_t version; |
35 |
uint32_t flags; |
36 |
uint32_t disk_sectors; |
37 |
uint32_t granularity; |
38 |
uint32_t l1dir_offset; |
39 |
uint32_t l1dir_size; |
40 |
uint32_t file_sectors; |
41 |
uint32_t cylinders; |
42 |
uint32_t heads; |
43 |
uint32_t sectors_per_track; |
44 |
} VMDK3Header; |
45 |
|
46 |
typedef struct { |
47 |
uint32_t version; |
48 |
uint32_t flags; |
49 |
int64_t capacity; |
50 |
int64_t granularity; |
51 |
int64_t desc_offset; |
52 |
int64_t desc_size; |
53 |
int32_t num_gtes_per_gte; |
54 |
int64_t rgd_offset; |
55 |
int64_t gd_offset; |
56 |
int64_t grain_offset; |
57 |
char filler[1]; |
58 |
char check_bytes[4]; |
59 |
} __attribute__((packed)) VMDK4Header; |
60 |
|
61 |
#define L2_CACHE_SIZE 16 |
62 |
|
63 |
typedef struct VmdkExtent { |
64 |
BlockDriverState *file; |
65 |
bool flat;
|
66 |
int64_t sectors; |
67 |
int64_t end_sector; |
68 |
int64_t l1_table_offset; |
69 |
int64_t l1_backup_table_offset; |
70 |
uint32_t *l1_table; |
71 |
uint32_t *l1_backup_table; |
72 |
unsigned int l1_size; |
73 |
uint32_t l1_entry_sectors; |
74 |
|
75 |
unsigned int l2_size; |
76 |
uint32_t *l2_cache; |
77 |
uint32_t l2_cache_offsets[L2_CACHE_SIZE]; |
78 |
uint32_t l2_cache_counts[L2_CACHE_SIZE]; |
79 |
|
80 |
unsigned int cluster_sectors; |
81 |
} VmdkExtent; |
82 |
|
83 |
typedef struct BDRVVmdkState { |
84 |
uint32_t parent_cid; |
85 |
int num_extents;
|
86 |
/* Extent array with num_extents entries, ascend ordered by address */
|
87 |
VmdkExtent *extents; |
88 |
} BDRVVmdkState; |
89 |
|
90 |
typedef struct VmdkMetaData { |
91 |
uint32_t offset; |
92 |
unsigned int l1_index; |
93 |
unsigned int l2_index; |
94 |
unsigned int l2_offset; |
95 |
int valid;
|
96 |
} VmdkMetaData; |
97 |
|
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 |
const char *p = (const char *)buf; |
110 |
const char *end = p + buf_size; |
111 |
while (p < end) {
|
112 |
if (*p == '#') { |
113 |
/* skip comment line */
|
114 |
while (p < end && *p != '\n') { |
115 |
p++; |
116 |
} |
117 |
p++; |
118 |
continue;
|
119 |
} |
120 |
if (*p == ' ') { |
121 |
while (p < end && *p == ' ') { |
122 |
p++; |
123 |
} |
124 |
/* skip '\r' if windows line endings used. */
|
125 |
if (p < end && *p == '\r') { |
126 |
p++; |
127 |
} |
128 |
/* only accept blank lines before 'version=' line */
|
129 |
if (p == end || *p != '\n') { |
130 |
return 0; |
131 |
} |
132 |
p++; |
133 |
continue;
|
134 |
} |
135 |
if (end - p >= strlen("version=X\n")) { |
136 |
if (strncmp("version=1\n", p, strlen("version=1\n")) == 0 || |
137 |
strncmp("version=2\n", p, strlen("version=2\n")) == 0) { |
138 |
return 100; |
139 |
} |
140 |
} |
141 |
if (end - p >= strlen("version=X\r\n")) { |
142 |
if (strncmp("version=1\r\n", p, strlen("version=1\r\n")) == 0 || |
143 |
strncmp("version=2\r\n", p, strlen("version=2\r\n")) == 0) { |
144 |
return 100; |
145 |
} |
146 |
} |
147 |
return 0; |
148 |
} |
149 |
return 0; |
150 |
} |
151 |
} |
152 |
|
153 |
#define CHECK_CID 1 |
154 |
|
155 |
#define SECTOR_SIZE 512 |
156 |
#define DESC_SIZE 20*SECTOR_SIZE // 20 sectors of 512 bytes each |
157 |
#define HEADER_SIZE 512 // first sector of 512 bytes |
158 |
|
159 |
static void vmdk_free_extents(BlockDriverState *bs) |
160 |
{ |
161 |
int i;
|
162 |
BDRVVmdkState *s = bs->opaque; |
163 |
|
164 |
for (i = 0; i < s->num_extents; i++) { |
165 |
qemu_free(s->extents[i].l1_table); |
166 |
qemu_free(s->extents[i].l2_cache); |
167 |
qemu_free(s->extents[i].l1_backup_table); |
168 |
} |
169 |
qemu_free(s->extents); |
170 |
} |
171 |
|
172 |
static uint32_t vmdk_read_cid(BlockDriverState *bs, int parent) |
173 |
{ |
174 |
char desc[DESC_SIZE];
|
175 |
uint32_t cid; |
176 |
const char *p_name, *cid_str; |
177 |
size_t cid_str_size; |
178 |
|
179 |
/* the descriptor offset = 0x200 */
|
180 |
if (bdrv_pread(bs->file, 0x200, desc, DESC_SIZE) != DESC_SIZE) |
181 |
return 0; |
182 |
|
183 |
if (parent) {
|
184 |
cid_str = "parentCID";
|
185 |
cid_str_size = sizeof("parentCID"); |
186 |
} else {
|
187 |
cid_str = "CID";
|
188 |
cid_str_size = sizeof("CID"); |
189 |
} |
190 |
|
191 |
if ((p_name = strstr(desc,cid_str)) != NULL) { |
192 |
p_name += cid_str_size; |
193 |
sscanf(p_name,"%x",&cid);
|
194 |
} |
195 |
|
196 |
return cid;
|
197 |
} |
198 |
|
199 |
static int vmdk_write_cid(BlockDriverState *bs, uint32_t cid) |
200 |
{ |
201 |
char desc[DESC_SIZE], tmp_desc[DESC_SIZE];
|
202 |
char *p_name, *tmp_str;
|
203 |
|
204 |
/* the descriptor offset = 0x200 */
|
205 |
if (bdrv_pread(bs->file, 0x200, desc, DESC_SIZE) != DESC_SIZE) |
206 |
return -1; |
207 |
|
208 |
tmp_str = strstr(desc,"parentCID");
|
209 |
pstrcpy(tmp_desc, sizeof(tmp_desc), tmp_str);
|
210 |
if ((p_name = strstr(desc,"CID")) != NULL) { |
211 |
p_name += sizeof("CID"); |
212 |
snprintf(p_name, sizeof(desc) - (p_name - desc), "%x\n", cid); |
213 |
pstrcat(desc, sizeof(desc), tmp_desc);
|
214 |
} |
215 |
|
216 |
if (bdrv_pwrite_sync(bs->file, 0x200, desc, DESC_SIZE) < 0) |
217 |
return -1; |
218 |
return 0; |
219 |
} |
220 |
|
221 |
static int vmdk_is_cid_valid(BlockDriverState *bs) |
222 |
{ |
223 |
#ifdef CHECK_CID
|
224 |
BDRVVmdkState *s = bs->opaque; |
225 |
BlockDriverState *p_bs = bs->backing_hd; |
226 |
uint32_t cur_pcid; |
227 |
|
228 |
if (p_bs) {
|
229 |
cur_pcid = vmdk_read_cid(p_bs,0);
|
230 |
if (s->parent_cid != cur_pcid)
|
231 |
// CID not valid
|
232 |
return 0; |
233 |
} |
234 |
#endif
|
235 |
// CID valid
|
236 |
return 1; |
237 |
} |
238 |
|
239 |
static int vmdk_snapshot_create(const char *filename, const char *backing_file) |
240 |
{ |
241 |
int snp_fd, p_fd;
|
242 |
int ret;
|
243 |
uint32_t p_cid; |
244 |
char *p_name, *gd_buf, *rgd_buf;
|
245 |
const char *real_filename, *temp_str; |
246 |
VMDK4Header header; |
247 |
uint32_t gde_entries, gd_size; |
248 |
int64_t gd_offset, rgd_offset, capacity, gt_size; |
249 |
char p_desc[DESC_SIZE], s_desc[DESC_SIZE], hdr[HEADER_SIZE];
|
250 |
static const char desc_template[] = |
251 |
"# Disk DescriptorFile\n"
|
252 |
"version=1\n"
|
253 |
"CID=%x\n"
|
254 |
"parentCID=%x\n"
|
255 |
"createType=\"monolithicSparse\"\n"
|
256 |
"parentFileNameHint=\"%s\"\n"
|
257 |
"\n"
|
258 |
"# Extent description\n"
|
259 |
"RW %u SPARSE \"%s\"\n"
|
260 |
"\n"
|
261 |
"# The Disk Data Base \n"
|
262 |
"#DDB\n"
|
263 |
"\n";
|
264 |
|
265 |
snp_fd = open(filename, O_RDWR | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, 0644);
|
266 |
if (snp_fd < 0) |
267 |
return -errno;
|
268 |
p_fd = open(backing_file, O_RDONLY | O_BINARY | O_LARGEFILE); |
269 |
if (p_fd < 0) { |
270 |
close(snp_fd); |
271 |
return -errno;
|
272 |
} |
273 |
|
274 |
/* read the header */
|
275 |
if (lseek(p_fd, 0x0, SEEK_SET) == -1) { |
276 |
ret = -errno; |
277 |
goto fail;
|
278 |
} |
279 |
if (read(p_fd, hdr, HEADER_SIZE) != HEADER_SIZE) {
|
280 |
ret = -errno; |
281 |
goto fail;
|
282 |
} |
283 |
|
284 |
/* write the header */
|
285 |
if (lseek(snp_fd, 0x0, SEEK_SET) == -1) { |
286 |
ret = -errno; |
287 |
goto fail;
|
288 |
} |
289 |
if (write(snp_fd, hdr, HEADER_SIZE) == -1) { |
290 |
ret = -errno; |
291 |
goto fail;
|
292 |
} |
293 |
|
294 |
memset(&header, 0, sizeof(header)); |
295 |
memcpy(&header,&hdr[4], sizeof(header)); // skip the VMDK4_MAGIC |
296 |
|
297 |
if (ftruncate(snp_fd, header.grain_offset << 9)) { |
298 |
ret = -errno; |
299 |
goto fail;
|
300 |
} |
301 |
/* the descriptor offset = 0x200 */
|
302 |
if (lseek(p_fd, 0x200, SEEK_SET) == -1) { |
303 |
ret = -errno; |
304 |
goto fail;
|
305 |
} |
306 |
if (read(p_fd, p_desc, DESC_SIZE) != DESC_SIZE) {
|
307 |
ret = -errno; |
308 |
goto fail;
|
309 |
} |
310 |
|
311 |
if ((p_name = strstr(p_desc,"CID")) != NULL) { |
312 |
p_name += sizeof("CID"); |
313 |
sscanf(p_name,"%x",&p_cid);
|
314 |
} |
315 |
|
316 |
real_filename = filename; |
317 |
if ((temp_str = strrchr(real_filename, '\\')) != NULL) |
318 |
real_filename = temp_str + 1;
|
319 |
if ((temp_str = strrchr(real_filename, '/')) != NULL) |
320 |
real_filename = temp_str + 1;
|
321 |
if ((temp_str = strrchr(real_filename, ':')) != NULL) |
322 |
real_filename = temp_str + 1;
|
323 |
|
324 |
snprintf(s_desc, sizeof(s_desc), desc_template, p_cid, p_cid, backing_file,
|
325 |
(uint32_t)header.capacity, real_filename); |
326 |
|
327 |
/* write the descriptor */
|
328 |
if (lseek(snp_fd, 0x200, SEEK_SET) == -1) { |
329 |
ret = -errno; |
330 |
goto fail;
|
331 |
} |
332 |
if (write(snp_fd, s_desc, strlen(s_desc)) == -1) { |
333 |
ret = -errno; |
334 |
goto fail;
|
335 |
} |
336 |
|
337 |
gd_offset = header.gd_offset * SECTOR_SIZE; // offset of GD table
|
338 |
rgd_offset = header.rgd_offset * SECTOR_SIZE; // offset of RGD table
|
339 |
capacity = header.capacity * SECTOR_SIZE; // Extent size
|
340 |
/*
|
341 |
* Each GDE span 32M disk, means:
|
342 |
* 512 GTE per GT, each GTE points to grain
|
343 |
*/
|
344 |
gt_size = (int64_t)header.num_gtes_per_gte * header.granularity * SECTOR_SIZE; |
345 |
if (!gt_size) {
|
346 |
ret = -EINVAL; |
347 |
goto fail;
|
348 |
} |
349 |
gde_entries = (uint32_t)(capacity / gt_size); // number of gde/rgde
|
350 |
gd_size = gde_entries * sizeof(uint32_t);
|
351 |
|
352 |
/* write RGD */
|
353 |
rgd_buf = qemu_malloc(gd_size); |
354 |
if (lseek(p_fd, rgd_offset, SEEK_SET) == -1) { |
355 |
ret = -errno; |
356 |
goto fail_rgd;
|
357 |
} |
358 |
if (read(p_fd, rgd_buf, gd_size) != gd_size) {
|
359 |
ret = -errno; |
360 |
goto fail_rgd;
|
361 |
} |
362 |
if (lseek(snp_fd, rgd_offset, SEEK_SET) == -1) { |
363 |
ret = -errno; |
364 |
goto fail_rgd;
|
365 |
} |
366 |
if (write(snp_fd, rgd_buf, gd_size) == -1) { |
367 |
ret = -errno; |
368 |
goto fail_rgd;
|
369 |
} |
370 |
|
371 |
/* write GD */
|
372 |
gd_buf = qemu_malloc(gd_size); |
373 |
if (lseek(p_fd, gd_offset, SEEK_SET) == -1) { |
374 |
ret = -errno; |
375 |
goto fail_gd;
|
376 |
} |
377 |
if (read(p_fd, gd_buf, gd_size) != gd_size) {
|
378 |
ret = -errno; |
379 |
goto fail_gd;
|
380 |
} |
381 |
if (lseek(snp_fd, gd_offset, SEEK_SET) == -1) { |
382 |
ret = -errno; |
383 |
goto fail_gd;
|
384 |
} |
385 |
if (write(snp_fd, gd_buf, gd_size) == -1) { |
386 |
ret = -errno; |
387 |
goto fail_gd;
|
388 |
} |
389 |
ret = 0;
|
390 |
|
391 |
fail_gd:
|
392 |
qemu_free(gd_buf); |
393 |
fail_rgd:
|
394 |
qemu_free(rgd_buf); |
395 |
fail:
|
396 |
close(p_fd); |
397 |
close(snp_fd); |
398 |
return ret;
|
399 |
} |
400 |
|
401 |
static int vmdk_parent_open(BlockDriverState *bs) |
402 |
{ |
403 |
char *p_name;
|
404 |
char desc[DESC_SIZE];
|
405 |
|
406 |
/* the descriptor offset = 0x200 */
|
407 |
if (bdrv_pread(bs->file, 0x200, desc, DESC_SIZE) != DESC_SIZE) |
408 |
return -1; |
409 |
|
410 |
if ((p_name = strstr(desc,"parentFileNameHint")) != NULL) { |
411 |
char *end_name;
|
412 |
|
413 |
p_name += sizeof("parentFileNameHint") + 1; |
414 |
if ((end_name = strchr(p_name,'\"')) == NULL) |
415 |
return -1; |
416 |
if ((end_name - p_name) > sizeof (bs->backing_file) - 1) |
417 |
return -1; |
418 |
|
419 |
pstrcpy(bs->backing_file, end_name - p_name + 1, p_name);
|
420 |
} |
421 |
|
422 |
return 0; |
423 |
} |
424 |
|
425 |
/* Create and append extent to the extent array. Return the added VmdkExtent
|
426 |
* address. return NULL if allocation failed. */
|
427 |
static VmdkExtent *vmdk_add_extent(BlockDriverState *bs,
|
428 |
BlockDriverState *file, bool flat, int64_t sectors,
|
429 |
int64_t l1_offset, int64_t l1_backup_offset, |
430 |
uint32_t l1_size, |
431 |
int l2_size, unsigned int cluster_sectors) |
432 |
{ |
433 |
VmdkExtent *extent; |
434 |
BDRVVmdkState *s = bs->opaque; |
435 |
|
436 |
s->extents = qemu_realloc(s->extents, |
437 |
(s->num_extents + 1) * sizeof(VmdkExtent)); |
438 |
extent = &s->extents[s->num_extents]; |
439 |
s->num_extents++; |
440 |
|
441 |
memset(extent, 0, sizeof(VmdkExtent)); |
442 |
extent->file = file; |
443 |
extent->flat = flat; |
444 |
extent->sectors = sectors; |
445 |
extent->l1_table_offset = l1_offset; |
446 |
extent->l1_backup_table_offset = l1_backup_offset; |
447 |
extent->l1_size = l1_size; |
448 |
extent->l1_entry_sectors = l2_size * cluster_sectors; |
449 |
extent->l2_size = l2_size; |
450 |
extent->cluster_sectors = cluster_sectors; |
451 |
|
452 |
if (s->num_extents > 1) { |
453 |
extent->end_sector = (*(extent - 1)).end_sector + extent->sectors;
|
454 |
} else {
|
455 |
extent->end_sector = extent->sectors; |
456 |
} |
457 |
bs->total_sectors = extent->end_sector; |
458 |
return extent;
|
459 |
} |
460 |
|
461 |
static int vmdk_init_tables(BlockDriverState *bs, VmdkExtent *extent) |
462 |
{ |
463 |
int ret;
|
464 |
int l1_size, i;
|
465 |
|
466 |
/* read the L1 table */
|
467 |
l1_size = extent->l1_size * sizeof(uint32_t);
|
468 |
extent->l1_table = qemu_malloc(l1_size); |
469 |
ret = bdrv_pread(extent->file, |
470 |
extent->l1_table_offset, |
471 |
extent->l1_table, |
472 |
l1_size); |
473 |
if (ret < 0) { |
474 |
goto fail_l1;
|
475 |
} |
476 |
for (i = 0; i < extent->l1_size; i++) { |
477 |
le32_to_cpus(&extent->l1_table[i]); |
478 |
} |
479 |
|
480 |
if (extent->l1_backup_table_offset) {
|
481 |
extent->l1_backup_table = qemu_malloc(l1_size); |
482 |
ret = bdrv_pread(extent->file, |
483 |
extent->l1_backup_table_offset, |
484 |
extent->l1_backup_table, |
485 |
l1_size); |
486 |
if (ret < 0) { |
487 |
goto fail_l1b;
|
488 |
} |
489 |
for (i = 0; i < extent->l1_size; i++) { |
490 |
le32_to_cpus(&extent->l1_backup_table[i]); |
491 |
} |
492 |
} |
493 |
|
494 |
extent->l2_cache = |
495 |
qemu_malloc(extent->l2_size * L2_CACHE_SIZE * sizeof(uint32_t));
|
496 |
return 0; |
497 |
fail_l1b:
|
498 |
qemu_free(extent->l1_backup_table); |
499 |
fail_l1:
|
500 |
qemu_free(extent->l1_table); |
501 |
return ret;
|
502 |
} |
503 |
|
504 |
static int vmdk_open_vmdk3(BlockDriverState *bs, int flags) |
505 |
{ |
506 |
int ret;
|
507 |
uint32_t magic; |
508 |
VMDK3Header header; |
509 |
VmdkExtent *extent; |
510 |
|
511 |
ret = bdrv_pread(bs->file, sizeof(magic), &header, sizeof(header)); |
512 |
if (ret < 0) { |
513 |
goto fail;
|
514 |
} |
515 |
extent = vmdk_add_extent(bs, |
516 |
bs->file, false,
|
517 |
le32_to_cpu(header.disk_sectors), |
518 |
le32_to_cpu(header.l1dir_offset) << 9,
|
519 |
0, 1 << 6, 1 << 9, |
520 |
le32_to_cpu(header.granularity)); |
521 |
ret = vmdk_init_tables(bs, extent); |
522 |
if (ret) {
|
523 |
/* vmdk_init_tables cleans up on fail, so only free allocation of
|
524 |
* vmdk_add_extent here. */
|
525 |
goto fail;
|
526 |
} |
527 |
return 0; |
528 |
fail:
|
529 |
vmdk_free_extents(bs); |
530 |
return ret;
|
531 |
} |
532 |
|
533 |
static int vmdk_open_vmdk4(BlockDriverState *bs, int flags) |
534 |
{ |
535 |
int ret;
|
536 |
uint32_t magic; |
537 |
uint32_t l1_size, l1_entry_sectors; |
538 |
VMDK4Header header; |
539 |
BDRVVmdkState *s = bs->opaque; |
540 |
VmdkExtent *extent; |
541 |
|
542 |
ret = bdrv_pread(bs->file, sizeof(magic), &header, sizeof(header)); |
543 |
if (ret < 0) { |
544 |
goto fail;
|
545 |
} |
546 |
l1_entry_sectors = le32_to_cpu(header.num_gtes_per_gte) |
547 |
* le64_to_cpu(header.granularity); |
548 |
l1_size = (le64_to_cpu(header.capacity) + l1_entry_sectors - 1)
|
549 |
/ l1_entry_sectors; |
550 |
extent = vmdk_add_extent(bs, bs->file, false,
|
551 |
le64_to_cpu(header.capacity), |
552 |
le64_to_cpu(header.gd_offset) << 9,
|
553 |
le64_to_cpu(header.rgd_offset) << 9,
|
554 |
l1_size, |
555 |
le32_to_cpu(header.num_gtes_per_gte), |
556 |
le64_to_cpu(header.granularity)); |
557 |
if (extent->l1_entry_sectors <= 0) { |
558 |
ret = -EINVAL; |
559 |
goto fail;
|
560 |
} |
561 |
/* try to open parent images, if exist */
|
562 |
ret = vmdk_parent_open(bs); |
563 |
if (ret) {
|
564 |
goto fail;
|
565 |
} |
566 |
s->parent_cid = vmdk_read_cid(bs, 1);
|
567 |
ret = vmdk_init_tables(bs, extent); |
568 |
if (ret) {
|
569 |
goto fail;
|
570 |
} |
571 |
return 0; |
572 |
fail:
|
573 |
vmdk_free_extents(bs); |
574 |
return ret;
|
575 |
} |
576 |
|
577 |
static int vmdk_open(BlockDriverState *bs, int flags) |
578 |
{ |
579 |
uint32_t magic; |
580 |
|
581 |
if (bdrv_pread(bs->file, 0, &magic, sizeof(magic)) != sizeof(magic)) { |
582 |
return -EIO;
|
583 |
} |
584 |
|
585 |
magic = be32_to_cpu(magic); |
586 |
if (magic == VMDK3_MAGIC) {
|
587 |
return vmdk_open_vmdk3(bs, flags);
|
588 |
} else if (magic == VMDK4_MAGIC) { |
589 |
return vmdk_open_vmdk4(bs, flags);
|
590 |
} else {
|
591 |
return -EINVAL;
|
592 |
} |
593 |
} |
594 |
|
595 |
static int get_whole_cluster(BlockDriverState *bs, |
596 |
VmdkExtent *extent, |
597 |
uint64_t cluster_offset, |
598 |
uint64_t offset, |
599 |
bool allocate)
|
600 |
{ |
601 |
/* 128 sectors * 512 bytes each = grain size 64KB */
|
602 |
uint8_t whole_grain[extent->cluster_sectors * 512];
|
603 |
|
604 |
/* we will be here if it's first write on non-exist grain(cluster).
|
605 |
* try to read from parent image, if exist */
|
606 |
if (bs->backing_hd) {
|
607 |
int ret;
|
608 |
|
609 |
if (!vmdk_is_cid_valid(bs))
|
610 |
return -1; |
611 |
|
612 |
/* floor offset to cluster */
|
613 |
offset -= offset % (extent->cluster_sectors * 512);
|
614 |
ret = bdrv_read(bs->backing_hd, offset >> 9, whole_grain,
|
615 |
extent->cluster_sectors); |
616 |
if (ret < 0) { |
617 |
return -1; |
618 |
} |
619 |
|
620 |
/* Write grain only into the active image */
|
621 |
ret = bdrv_write(extent->file, cluster_offset, whole_grain, |
622 |
extent->cluster_sectors); |
623 |
if (ret < 0) { |
624 |
return -1; |
625 |
} |
626 |
} |
627 |
return 0; |
628 |
} |
629 |
|
630 |
static int vmdk_L2update(VmdkExtent *extent, VmdkMetaData *m_data) |
631 |
{ |
632 |
/* update L2 table */
|
633 |
if (bdrv_pwrite_sync(
|
634 |
extent->file, |
635 |
((int64_t)m_data->l2_offset * 512)
|
636 |
+ (m_data->l2_index * sizeof(m_data->offset)),
|
637 |
&(m_data->offset), |
638 |
sizeof(m_data->offset)
|
639 |
) < 0) {
|
640 |
return -1; |
641 |
} |
642 |
/* update backup L2 table */
|
643 |
if (extent->l1_backup_table_offset != 0) { |
644 |
m_data->l2_offset = extent->l1_backup_table[m_data->l1_index]; |
645 |
if (bdrv_pwrite_sync(
|
646 |
extent->file, |
647 |
((int64_t)m_data->l2_offset * 512)
|
648 |
+ (m_data->l2_index * sizeof(m_data->offset)),
|
649 |
&(m_data->offset), sizeof(m_data->offset)
|
650 |
) < 0) {
|
651 |
return -1; |
652 |
} |
653 |
} |
654 |
|
655 |
return 0; |
656 |
} |
657 |
|
658 |
static uint64_t get_cluster_offset(BlockDriverState *bs,
|
659 |
VmdkExtent *extent, |
660 |
VmdkMetaData *m_data, |
661 |
uint64_t offset, int allocate)
|
662 |
{ |
663 |
unsigned int l1_index, l2_offset, l2_index; |
664 |
int min_index, i, j;
|
665 |
uint32_t min_count, *l2_table, tmp = 0;
|
666 |
uint64_t cluster_offset; |
667 |
|
668 |
if (m_data)
|
669 |
m_data->valid = 0;
|
670 |
|
671 |
l1_index = (offset >> 9) / extent->l1_entry_sectors;
|
672 |
if (l1_index >= extent->l1_size) {
|
673 |
return 0; |
674 |
} |
675 |
l2_offset = extent->l1_table[l1_index]; |
676 |
if (!l2_offset) {
|
677 |
return 0; |
678 |
} |
679 |
for (i = 0; i < L2_CACHE_SIZE; i++) { |
680 |
if (l2_offset == extent->l2_cache_offsets[i]) {
|
681 |
/* increment the hit count */
|
682 |
if (++extent->l2_cache_counts[i] == 0xffffffff) { |
683 |
for (j = 0; j < L2_CACHE_SIZE; j++) { |
684 |
extent->l2_cache_counts[j] >>= 1;
|
685 |
} |
686 |
} |
687 |
l2_table = extent->l2_cache + (i * extent->l2_size); |
688 |
goto found;
|
689 |
} |
690 |
} |
691 |
/* not found: load a new entry in the least used one */
|
692 |
min_index = 0;
|
693 |
min_count = 0xffffffff;
|
694 |
for (i = 0; i < L2_CACHE_SIZE; i++) { |
695 |
if (extent->l2_cache_counts[i] < min_count) {
|
696 |
min_count = extent->l2_cache_counts[i]; |
697 |
min_index = i; |
698 |
} |
699 |
} |
700 |
l2_table = extent->l2_cache + (min_index * extent->l2_size); |
701 |
if (bdrv_pread(
|
702 |
extent->file, |
703 |
(int64_t)l2_offset * 512,
|
704 |
l2_table, |
705 |
extent->l2_size * sizeof(uint32_t)
|
706 |
) != extent->l2_size * sizeof(uint32_t)) {
|
707 |
return 0; |
708 |
} |
709 |
|
710 |
extent->l2_cache_offsets[min_index] = l2_offset; |
711 |
extent->l2_cache_counts[min_index] = 1;
|
712 |
found:
|
713 |
l2_index = ((offset >> 9) / extent->cluster_sectors) % extent->l2_size;
|
714 |
cluster_offset = le32_to_cpu(l2_table[l2_index]); |
715 |
|
716 |
if (!cluster_offset) {
|
717 |
if (!allocate)
|
718 |
return 0; |
719 |
|
720 |
// Avoid the L2 tables update for the images that have snapshots.
|
721 |
cluster_offset = bdrv_getlength(extent->file); |
722 |
bdrv_truncate( |
723 |
extent->file, |
724 |
cluster_offset + (extent->cluster_sectors << 9)
|
725 |
); |
726 |
|
727 |
cluster_offset >>= 9;
|
728 |
tmp = cpu_to_le32(cluster_offset); |
729 |
l2_table[l2_index] = tmp; |
730 |
|
731 |
/* First of all we write grain itself, to avoid race condition
|
732 |
* that may to corrupt the image.
|
733 |
* This problem may occur because of insufficient space on host disk
|
734 |
* or inappropriate VM shutdown.
|
735 |
*/
|
736 |
if (get_whole_cluster(
|
737 |
bs, extent, cluster_offset, offset, allocate) == -1)
|
738 |
return 0; |
739 |
|
740 |
if (m_data) {
|
741 |
m_data->offset = tmp; |
742 |
m_data->l1_index = l1_index; |
743 |
m_data->l2_index = l2_index; |
744 |
m_data->l2_offset = l2_offset; |
745 |
m_data->valid = 1;
|
746 |
} |
747 |
} |
748 |
cluster_offset <<= 9;
|
749 |
return cluster_offset;
|
750 |
} |
751 |
|
752 |
static VmdkExtent *find_extent(BDRVVmdkState *s,
|
753 |
int64_t sector_num, VmdkExtent *start_hint) |
754 |
{ |
755 |
VmdkExtent *extent = start_hint; |
756 |
|
757 |
if (!extent) {
|
758 |
extent = &s->extents[0];
|
759 |
} |
760 |
while (extent < &s->extents[s->num_extents]) {
|
761 |
if (sector_num < extent->end_sector) {
|
762 |
return extent;
|
763 |
} |
764 |
extent++; |
765 |
} |
766 |
return NULL; |
767 |
} |
768 |
|
769 |
static int vmdk_is_allocated(BlockDriverState *bs, int64_t sector_num, |
770 |
int nb_sectors, int *pnum) |
771 |
{ |
772 |
BDRVVmdkState *s = bs->opaque; |
773 |
|
774 |
int64_t index_in_cluster, n, ret; |
775 |
uint64_t offset; |
776 |
VmdkExtent *extent; |
777 |
|
778 |
extent = find_extent(s, sector_num, NULL);
|
779 |
if (!extent) {
|
780 |
return 0; |
781 |
} |
782 |
if (extent->flat) {
|
783 |
n = extent->end_sector - sector_num; |
784 |
ret = 1;
|
785 |
} else {
|
786 |
offset = get_cluster_offset(bs, extent, NULL, sector_num * 512, 0); |
787 |
index_in_cluster = sector_num % extent->cluster_sectors; |
788 |
n = extent->cluster_sectors - index_in_cluster; |
789 |
ret = offset ? 1 : 0; |
790 |
} |
791 |
if (n > nb_sectors)
|
792 |
n = nb_sectors; |
793 |
*pnum = n; |
794 |
return ret;
|
795 |
} |
796 |
|
797 |
static int vmdk_read(BlockDriverState *bs, int64_t sector_num, |
798 |
uint8_t *buf, int nb_sectors)
|
799 |
{ |
800 |
BDRVVmdkState *s = bs->opaque; |
801 |
int ret;
|
802 |
uint64_t n, index_in_cluster; |
803 |
VmdkExtent *extent = NULL;
|
804 |
uint64_t cluster_offset; |
805 |
|
806 |
while (nb_sectors > 0) { |
807 |
extent = find_extent(s, sector_num, extent); |
808 |
if (!extent) {
|
809 |
return -EIO;
|
810 |
} |
811 |
cluster_offset = get_cluster_offset( |
812 |
bs, extent, NULL, sector_num << 9, 0); |
813 |
index_in_cluster = sector_num % extent->cluster_sectors; |
814 |
n = extent->cluster_sectors - index_in_cluster; |
815 |
if (n > nb_sectors)
|
816 |
n = nb_sectors; |
817 |
if (!cluster_offset) {
|
818 |
// try to read from parent image, if exist
|
819 |
if (bs->backing_hd) {
|
820 |
if (!vmdk_is_cid_valid(bs))
|
821 |
return -1; |
822 |
ret = bdrv_read(bs->backing_hd, sector_num, buf, n); |
823 |
if (ret < 0) |
824 |
return -1; |
825 |
} else {
|
826 |
memset(buf, 0, 512 * n); |
827 |
} |
828 |
} else {
|
829 |
if(bdrv_pread(bs->file, cluster_offset + index_in_cluster * 512, buf, n * 512) != n * 512) |
830 |
return -1; |
831 |
} |
832 |
nb_sectors -= n; |
833 |
sector_num += n; |
834 |
buf += n * 512;
|
835 |
} |
836 |
return 0; |
837 |
} |
838 |
|
839 |
static int vmdk_write(BlockDriverState *bs, int64_t sector_num, |
840 |
const uint8_t *buf, int nb_sectors) |
841 |
{ |
842 |
BDRVVmdkState *s = bs->opaque; |
843 |
VmdkExtent *extent = NULL;
|
844 |
int n;
|
845 |
int64_t index_in_cluster; |
846 |
uint64_t cluster_offset; |
847 |
static int cid_update = 0; |
848 |
VmdkMetaData m_data; |
849 |
|
850 |
if (sector_num > bs->total_sectors) {
|
851 |
fprintf(stderr, |
852 |
"(VMDK) Wrong offset: sector_num=0x%" PRIx64
|
853 |
" total_sectors=0x%" PRIx64 "\n", |
854 |
sector_num, bs->total_sectors); |
855 |
return -1; |
856 |
} |
857 |
|
858 |
while (nb_sectors > 0) { |
859 |
extent = find_extent(s, sector_num, extent); |
860 |
if (!extent) {
|
861 |
return -EIO;
|
862 |
} |
863 |
cluster_offset = get_cluster_offset( |
864 |
bs, |
865 |
extent, |
866 |
&m_data, |
867 |
sector_num << 9, 1); |
868 |
if (!cluster_offset) {
|
869 |
return -1; |
870 |
} |
871 |
index_in_cluster = sector_num % extent->cluster_sectors; |
872 |
n = extent->cluster_sectors - index_in_cluster; |
873 |
if (n > nb_sectors) {
|
874 |
n = nb_sectors; |
875 |
} |
876 |
|
877 |
if (bdrv_pwrite(bs->file,
|
878 |
cluster_offset + index_in_cluster * 512,
|
879 |
buf, n * 512)
|
880 |
!= n * 512) {
|
881 |
return -1; |
882 |
} |
883 |
if (m_data.valid) {
|
884 |
/* update L2 tables */
|
885 |
if (vmdk_L2update(extent, &m_data) == -1) { |
886 |
return -1; |
887 |
} |
888 |
} |
889 |
nb_sectors -= n; |
890 |
sector_num += n; |
891 |
buf += n * 512;
|
892 |
|
893 |
// update CID on the first write every time the virtual disk is opened
|
894 |
if (!cid_update) {
|
895 |
vmdk_write_cid(bs, time(NULL));
|
896 |
cid_update++; |
897 |
} |
898 |
} |
899 |
return 0; |
900 |
} |
901 |
|
902 |
static int vmdk_create(const char *filename, QEMUOptionParameter *options) |
903 |
{ |
904 |
int fd, i;
|
905 |
VMDK4Header header; |
906 |
uint32_t tmp, magic, grains, gd_size, gt_size, gt_count; |
907 |
static const char desc_template[] = |
908 |
"# Disk DescriptorFile\n"
|
909 |
"version=1\n"
|
910 |
"CID=%x\n"
|
911 |
"parentCID=ffffffff\n"
|
912 |
"createType=\"monolithicSparse\"\n"
|
913 |
"\n"
|
914 |
"# Extent description\n"
|
915 |
"RW %" PRId64 " SPARSE \"%s\"\n" |
916 |
"\n"
|
917 |
"# The Disk Data Base \n"
|
918 |
"#DDB\n"
|
919 |
"\n"
|
920 |
"ddb.virtualHWVersion = \"%d\"\n"
|
921 |
"ddb.geometry.cylinders = \"%" PRId64 "\"\n" |
922 |
"ddb.geometry.heads = \"16\"\n"
|
923 |
"ddb.geometry.sectors = \"63\"\n"
|
924 |
"ddb.adapterType = \"ide\"\n";
|
925 |
char desc[1024]; |
926 |
const char *real_filename, *temp_str; |
927 |
int64_t total_size = 0;
|
928 |
const char *backing_file = NULL; |
929 |
int flags = 0; |
930 |
int ret;
|
931 |
|
932 |
// Read out options
|
933 |
while (options && options->name) {
|
934 |
if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
|
935 |
total_size = options->value.n / 512;
|
936 |
} else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) { |
937 |
backing_file = options->value.s; |
938 |
} else if (!strcmp(options->name, BLOCK_OPT_COMPAT6)) { |
939 |
flags |= options->value.n ? BLOCK_FLAG_COMPAT6: 0;
|
940 |
} |
941 |
options++; |
942 |
} |
943 |
|
944 |
/* XXX: add support for backing file */
|
945 |
if (backing_file) {
|
946 |
return vmdk_snapshot_create(filename, backing_file);
|
947 |
} |
948 |
|
949 |
fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, |
950 |
0644);
|
951 |
if (fd < 0) |
952 |
return -errno;
|
953 |
magic = cpu_to_be32(VMDK4_MAGIC); |
954 |
memset(&header, 0, sizeof(header)); |
955 |
header.version = 1;
|
956 |
header.flags = 3; /* ?? */ |
957 |
header.capacity = total_size; |
958 |
header.granularity = 128;
|
959 |
header.num_gtes_per_gte = 512;
|
960 |
|
961 |
grains = (total_size + header.granularity - 1) / header.granularity;
|
962 |
gt_size = ((header.num_gtes_per_gte * sizeof(uint32_t)) + 511) >> 9; |
963 |
gt_count = (grains + header.num_gtes_per_gte - 1) / header.num_gtes_per_gte;
|
964 |
gd_size = (gt_count * sizeof(uint32_t) + 511) >> 9; |
965 |
|
966 |
header.desc_offset = 1;
|
967 |
header.desc_size = 20;
|
968 |
header.rgd_offset = header.desc_offset + header.desc_size; |
969 |
header.gd_offset = header.rgd_offset + gd_size + (gt_size * gt_count); |
970 |
header.grain_offset = |
971 |
((header.gd_offset + gd_size + (gt_size * gt_count) + |
972 |
header.granularity - 1) / header.granularity) *
|
973 |
header.granularity; |
974 |
|
975 |
/* swap endianness for all header fields */
|
976 |
header.version = cpu_to_le32(header.version); |
977 |
header.flags = cpu_to_le32(header.flags); |
978 |
header.capacity = cpu_to_le64(header.capacity); |
979 |
header.granularity = cpu_to_le64(header.granularity); |
980 |
header.num_gtes_per_gte = cpu_to_le32(header.num_gtes_per_gte); |
981 |
header.desc_offset = cpu_to_le64(header.desc_offset); |
982 |
header.desc_size = cpu_to_le64(header.desc_size); |
983 |
header.rgd_offset = cpu_to_le64(header.rgd_offset); |
984 |
header.gd_offset = cpu_to_le64(header.gd_offset); |
985 |
header.grain_offset = cpu_to_le64(header.grain_offset); |
986 |
|
987 |
header.check_bytes[0] = 0xa; |
988 |
header.check_bytes[1] = 0x20; |
989 |
header.check_bytes[2] = 0xd; |
990 |
header.check_bytes[3] = 0xa; |
991 |
|
992 |
/* write all the data */
|
993 |
ret = qemu_write_full(fd, &magic, sizeof(magic));
|
994 |
if (ret != sizeof(magic)) { |
995 |
ret = -errno; |
996 |
goto exit;
|
997 |
} |
998 |
ret = qemu_write_full(fd, &header, sizeof(header));
|
999 |
if (ret != sizeof(header)) { |
1000 |
ret = -errno; |
1001 |
goto exit;
|
1002 |
} |
1003 |
|
1004 |
ret = ftruncate(fd, le64_to_cpu(header.grain_offset) << 9);
|
1005 |
if (ret < 0) { |
1006 |
ret = -errno; |
1007 |
goto exit;
|
1008 |
} |
1009 |
|
1010 |
/* write grain directory */
|
1011 |
lseek(fd, le64_to_cpu(header.rgd_offset) << 9, SEEK_SET);
|
1012 |
for (i = 0, tmp = le64_to_cpu(header.rgd_offset) + gd_size; |
1013 |
i < gt_count; i++, tmp += gt_size) { |
1014 |
ret = qemu_write_full(fd, &tmp, sizeof(tmp));
|
1015 |
if (ret != sizeof(tmp)) { |
1016 |
ret = -errno; |
1017 |
goto exit;
|
1018 |
} |
1019 |
} |
1020 |
|
1021 |
/* write backup grain directory */
|
1022 |
lseek(fd, le64_to_cpu(header.gd_offset) << 9, SEEK_SET);
|
1023 |
for (i = 0, tmp = le64_to_cpu(header.gd_offset) + gd_size; |
1024 |
i < gt_count; i++, tmp += gt_size) { |
1025 |
ret = qemu_write_full(fd, &tmp, sizeof(tmp));
|
1026 |
if (ret != sizeof(tmp)) { |
1027 |
ret = -errno; |
1028 |
goto exit;
|
1029 |
} |
1030 |
} |
1031 |
|
1032 |
/* compose the descriptor */
|
1033 |
real_filename = filename; |
1034 |
if ((temp_str = strrchr(real_filename, '\\')) != NULL) |
1035 |
real_filename = temp_str + 1;
|
1036 |
if ((temp_str = strrchr(real_filename, '/')) != NULL) |
1037 |
real_filename = temp_str + 1;
|
1038 |
if ((temp_str = strrchr(real_filename, ':')) != NULL) |
1039 |
real_filename = temp_str + 1;
|
1040 |
snprintf(desc, sizeof(desc), desc_template, (unsigned int)time(NULL), |
1041 |
total_size, real_filename, |
1042 |
(flags & BLOCK_FLAG_COMPAT6 ? 6 : 4), |
1043 |
total_size / (int64_t)(63 * 16)); |
1044 |
|
1045 |
/* write the descriptor */
|
1046 |
lseek(fd, le64_to_cpu(header.desc_offset) << 9, SEEK_SET);
|
1047 |
ret = qemu_write_full(fd, desc, strlen(desc)); |
1048 |
if (ret != strlen(desc)) {
|
1049 |
ret = -errno; |
1050 |
goto exit;
|
1051 |
} |
1052 |
|
1053 |
ret = 0;
|
1054 |
exit:
|
1055 |
close(fd); |
1056 |
return ret;
|
1057 |
} |
1058 |
|
1059 |
static void vmdk_close(BlockDriverState *bs) |
1060 |
{ |
1061 |
vmdk_free_extents(bs); |
1062 |
} |
1063 |
|
1064 |
static int vmdk_flush(BlockDriverState *bs) |
1065 |
{ |
1066 |
return bdrv_flush(bs->file);
|
1067 |
} |
1068 |
|
1069 |
|
1070 |
static QEMUOptionParameter vmdk_create_options[] = {
|
1071 |
{ |
1072 |
.name = BLOCK_OPT_SIZE, |
1073 |
.type = OPT_SIZE, |
1074 |
.help = "Virtual disk size"
|
1075 |
}, |
1076 |
{ |
1077 |
.name = BLOCK_OPT_BACKING_FILE, |
1078 |
.type = OPT_STRING, |
1079 |
.help = "File name of a base image"
|
1080 |
}, |
1081 |
{ |
1082 |
.name = BLOCK_OPT_COMPAT6, |
1083 |
.type = OPT_FLAG, |
1084 |
.help = "VMDK version 6 image"
|
1085 |
}, |
1086 |
{ NULL }
|
1087 |
}; |
1088 |
|
1089 |
static BlockDriver bdrv_vmdk = {
|
1090 |
.format_name = "vmdk",
|
1091 |
.instance_size = sizeof(BDRVVmdkState),
|
1092 |
.bdrv_probe = vmdk_probe, |
1093 |
.bdrv_open = vmdk_open, |
1094 |
.bdrv_read = vmdk_read, |
1095 |
.bdrv_write = vmdk_write, |
1096 |
.bdrv_close = vmdk_close, |
1097 |
.bdrv_create = vmdk_create, |
1098 |
.bdrv_flush = vmdk_flush, |
1099 |
.bdrv_is_allocated = vmdk_is_allocated, |
1100 |
|
1101 |
.create_options = vmdk_create_options, |
1102 |
}; |
1103 |
|
1104 |
static void bdrv_vmdk_init(void) |
1105 |
{ |
1106 |
bdrv_register(&bdrv_vmdk); |
1107 |
} |
1108 |
|
1109 |
block_init(bdrv_vmdk_init); |