root / block / vmdk.c @ 14899cdf
History | View | Annotate | Download (26.4 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 BDRVVmdkState { |
64 |
BlockDriverState *hd; |
65 |
int64_t l1_table_offset; |
66 |
int64_t l1_backup_table_offset; |
67 |
uint32_t *l1_table; |
68 |
uint32_t *l1_backup_table; |
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; |
78 |
uint32_t parent_cid; |
79 |
int is_parent;
|
80 |
} BDRVVmdkState; |
81 |
|
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 |
|
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 |
|
112 |
#define CHECK_CID 1 |
113 |
|
114 |
#define SECTOR_SIZE 512 |
115 |
#define DESC_SIZE 20*SECTOR_SIZE // 20 sectors of 512 bytes each |
116 |
#define HEADER_SIZE 512 // first sector of 512 bytes |
117 |
|
118 |
static uint32_t vmdk_read_cid(BlockDriverState *bs, int parent) |
119 |
{ |
120 |
BDRVVmdkState *s = bs->opaque; |
121 |
char desc[DESC_SIZE];
|
122 |
uint32_t cid; |
123 |
const char *p_name, *cid_str; |
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 |
|
138 |
if ((p_name = strstr(desc,cid_str)) != NULL) { |
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");
|
157 |
pstrcpy(tmp_desc, sizeof(tmp_desc), tmp_str);
|
158 |
if ((p_name = strstr(desc,"CID")) != NULL) { |
159 |
p_name += sizeof("CID"); |
160 |
snprintf(p_name, sizeof(desc) - (p_name - desc), "%x\n", cid); |
161 |
pstrcat(desc, sizeof(desc), tmp_desc);
|
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; |
173 |
BlockDriverState *p_bs = s->hd->backing_hd; |
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;
|
190 |
uint32_t p_cid; |
191 |
char *p_name, *gd_buf, *rgd_buf;
|
192 |
const char *real_filename, *temp_str; |
193 |
VMDK4Header header; |
194 |
uint32_t gde_entries, gd_size; |
195 |
int64_t gd_offset, rgd_offset, capacity, gt_size; |
196 |
char p_desc[DESC_SIZE], s_desc[DESC_SIZE], hdr[HEADER_SIZE];
|
197 |
static const char desc_template[] = |
198 |
"# Disk DescriptorFile\n"
|
199 |
"version=1\n"
|
200 |
"CID=%x\n"
|
201 |
"parentCID=%x\n"
|
202 |
"createType=\"monolithicSparse\"\n"
|
203 |
"parentFileNameHint=\"%s\"\n"
|
204 |
"\n"
|
205 |
"# Extent description\n"
|
206 |
"RW %u SPARSE \"%s\"\n"
|
207 |
"\n"
|
208 |
"# The Disk Data Base \n"
|
209 |
"#DDB\n"
|
210 |
"\n";
|
211 |
|
212 |
snp_fd = open(filename, O_RDWR | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, 0644);
|
213 |
if (snp_fd < 0) |
214 |
return -1; |
215 |
p_fd = open(backing_file, O_RDONLY | O_BINARY | O_LARGEFILE); |
216 |
if (p_fd < 0) { |
217 |
close(snp_fd); |
218 |
return -1; |
219 |
} |
220 |
|
221 |
/* read the header */
|
222 |
if (lseek(p_fd, 0x0, SEEK_SET) == -1) |
223 |
goto fail;
|
224 |
if (read(p_fd, hdr, HEADER_SIZE) != HEADER_SIZE)
|
225 |
goto fail;
|
226 |
|
227 |
/* write the header */
|
228 |
if (lseek(snp_fd, 0x0, SEEK_SET) == -1) |
229 |
goto fail;
|
230 |
if (write(snp_fd, hdr, HEADER_SIZE) == -1) |
231 |
goto fail;
|
232 |
|
233 |
memset(&header, 0, sizeof(header)); |
234 |
memcpy(&header,&hdr[4], sizeof(header)); // skip the VMDK4_MAGIC |
235 |
|
236 |
ftruncate(snp_fd, header.grain_offset << 9);
|
237 |
/* the descriptor offset = 0x200 */
|
238 |
if (lseek(p_fd, 0x200, SEEK_SET) == -1) |
239 |
goto fail;
|
240 |
if (read(p_fd, p_desc, DESC_SIZE) != DESC_SIZE)
|
241 |
goto fail;
|
242 |
|
243 |
if ((p_name = strstr(p_desc,"CID")) != NULL) { |
244 |
p_name += sizeof("CID"); |
245 |
sscanf(p_name,"%x",&p_cid);
|
246 |
} |
247 |
|
248 |
real_filename = filename; |
249 |
if ((temp_str = strrchr(real_filename, '\\')) != NULL) |
250 |
real_filename = temp_str + 1;
|
251 |
if ((temp_str = strrchr(real_filename, '/')) != NULL) |
252 |
real_filename = temp_str + 1;
|
253 |
if ((temp_str = strrchr(real_filename, ':')) != NULL) |
254 |
real_filename = temp_str + 1;
|
255 |
|
256 |
snprintf(s_desc, sizeof(s_desc), desc_template, p_cid, p_cid, backing_file,
|
257 |
(uint32_t)header.capacity, real_filename); |
258 |
|
259 |
/* write the descriptor */
|
260 |
if (lseek(snp_fd, 0x200, SEEK_SET) == -1) |
261 |
goto fail;
|
262 |
if (write(snp_fd, s_desc, strlen(s_desc)) == -1) |
263 |
goto fail;
|
264 |
|
265 |
gd_offset = header.gd_offset * SECTOR_SIZE; // offset of GD table
|
266 |
rgd_offset = header.rgd_offset * SECTOR_SIZE; // offset of RGD table
|
267 |
capacity = header.capacity * SECTOR_SIZE; // Extent size
|
268 |
/*
|
269 |
* Each GDE span 32M disk, means:
|
270 |
* 512 GTE per GT, each GTE points to grain
|
271 |
*/
|
272 |
gt_size = (int64_t)header.num_gtes_per_gte * header.granularity * SECTOR_SIZE; |
273 |
if (!gt_size)
|
274 |
goto fail;
|
275 |
gde_entries = (uint32_t)(capacity / gt_size); // number of gde/rgde
|
276 |
gd_size = gde_entries * sizeof(uint32_t);
|
277 |
|
278 |
/* write RGD */
|
279 |
rgd_buf = qemu_malloc(gd_size); |
280 |
if (lseek(p_fd, rgd_offset, SEEK_SET) == -1) |
281 |
goto fail_rgd;
|
282 |
if (read(p_fd, rgd_buf, gd_size) != gd_size)
|
283 |
goto fail_rgd;
|
284 |
if (lseek(snp_fd, rgd_offset, SEEK_SET) == -1) |
285 |
goto fail_rgd;
|
286 |
if (write(snp_fd, rgd_buf, gd_size) == -1) |
287 |
goto fail_rgd;
|
288 |
qemu_free(rgd_buf); |
289 |
|
290 |
/* write GD */
|
291 |
gd_buf = qemu_malloc(gd_size); |
292 |
if (lseek(p_fd, gd_offset, SEEK_SET) == -1) |
293 |
goto fail_gd;
|
294 |
if (read(p_fd, gd_buf, gd_size) != gd_size)
|
295 |
goto fail_gd;
|
296 |
if (lseek(snp_fd, gd_offset, SEEK_SET) == -1) |
297 |
goto fail_gd;
|
298 |
if (write(snp_fd, gd_buf, gd_size) == -1) |
299 |
goto fail_gd;
|
300 |
qemu_free(gd_buf); |
301 |
|
302 |
close(p_fd); |
303 |
close(snp_fd); |
304 |
return 0; |
305 |
|
306 |
fail_gd:
|
307 |
qemu_free(gd_buf); |
308 |
fail_rgd:
|
309 |
qemu_free(rgd_buf); |
310 |
fail:
|
311 |
close(p_fd); |
312 |
close(snp_fd); |
313 |
return -1; |
314 |
} |
315 |
|
316 |
static void vmdk_parent_close(BlockDriverState *bs) |
317 |
{ |
318 |
if (bs->backing_hd)
|
319 |
bdrv_close(bs->backing_hd); |
320 |
} |
321 |
|
322 |
static int parent_open = 0; |
323 |
static int vmdk_parent_open(BlockDriverState *bs, const char * filename) |
324 |
{ |
325 |
BDRVVmdkState *s = bs->opaque; |
326 |
char *p_name;
|
327 |
char desc[DESC_SIZE];
|
328 |
char parent_img_name[1024]; |
329 |
|
330 |
/* the descriptor offset = 0x200 */
|
331 |
if (bdrv_pread(s->hd, 0x200, desc, DESC_SIZE) != DESC_SIZE) |
332 |
return -1; |
333 |
|
334 |
if ((p_name = strstr(desc,"parentFileNameHint")) != NULL) { |
335 |
char *end_name;
|
336 |
struct stat file_buf;
|
337 |
|
338 |
p_name += sizeof("parentFileNameHint") + 1; |
339 |
if ((end_name = strchr(p_name,'\"')) == NULL) |
340 |
return -1; |
341 |
if ((end_name - p_name) > sizeof (s->hd->backing_file) - 1) |
342 |
return -1; |
343 |
|
344 |
pstrcpy(s->hd->backing_file, end_name - p_name + 1, p_name);
|
345 |
if (stat(s->hd->backing_file, &file_buf) != 0) { |
346 |
path_combine(parent_img_name, sizeof(parent_img_name),
|
347 |
filename, s->hd->backing_file); |
348 |
} else {
|
349 |
pstrcpy(parent_img_name, sizeof(parent_img_name),
|
350 |
s->hd->backing_file); |
351 |
} |
352 |
|
353 |
s->hd->backing_hd = bdrv_new("");
|
354 |
if (!s->hd->backing_hd) {
|
355 |
failure:
|
356 |
bdrv_close(s->hd); |
357 |
return -1; |
358 |
} |
359 |
parent_open = 1;
|
360 |
if (bdrv_open(s->hd->backing_hd, parent_img_name, BDRV_O_RDONLY) < 0) |
361 |
goto failure;
|
362 |
parent_open = 0;
|
363 |
} |
364 |
|
365 |
return 0; |
366 |
} |
367 |
|
368 |
static int vmdk_open(BlockDriverState *bs, const char *filename, int flags) |
369 |
{ |
370 |
BDRVVmdkState *s = bs->opaque; |
371 |
uint32_t magic; |
372 |
int l1_size, i, ret;
|
373 |
|
374 |
if (parent_open)
|
375 |
// Parent must be opened as RO.
|
376 |
flags = BDRV_O_RDONLY; |
377 |
|
378 |
ret = bdrv_file_open(&s->hd, filename, flags); |
379 |
if (ret < 0) |
380 |
return ret;
|
381 |
if (bdrv_pread(s->hd, 0, &magic, sizeof(magic)) != sizeof(magic)) |
382 |
goto fail;
|
383 |
|
384 |
magic = be32_to_cpu(magic); |
385 |
if (magic == VMDK3_MAGIC) {
|
386 |
VMDK3Header header; |
387 |
|
388 |
if (bdrv_pread(s->hd, sizeof(magic), &header, sizeof(header)) != sizeof(header)) |
389 |
goto fail;
|
390 |
s->cluster_sectors = le32_to_cpu(header.granularity); |
391 |
s->l2_size = 1 << 9; |
392 |
s->l1_size = 1 << 6; |
393 |
bs->total_sectors = le32_to_cpu(header.disk_sectors); |
394 |
s->l1_table_offset = le32_to_cpu(header.l1dir_offset) << 9;
|
395 |
s->l1_backup_table_offset = 0;
|
396 |
s->l1_entry_sectors = s->l2_size * s->cluster_sectors; |
397 |
} else if (magic == VMDK4_MAGIC) { |
398 |
VMDK4Header header; |
399 |
|
400 |
if (bdrv_pread(s->hd, sizeof(magic), &header, sizeof(header)) != sizeof(header)) |
401 |
goto fail;
|
402 |
bs->total_sectors = le64_to_cpu(header.capacity); |
403 |
s->cluster_sectors = le64_to_cpu(header.granularity); |
404 |
s->l2_size = le32_to_cpu(header.num_gtes_per_gte); |
405 |
s->l1_entry_sectors = s->l2_size * s->cluster_sectors; |
406 |
if (s->l1_entry_sectors <= 0) |
407 |
goto fail;
|
408 |
s->l1_size = (bs->total_sectors + s->l1_entry_sectors - 1)
|
409 |
/ s->l1_entry_sectors; |
410 |
s->l1_table_offset = le64_to_cpu(header.rgd_offset) << 9;
|
411 |
s->l1_backup_table_offset = le64_to_cpu(header.gd_offset) << 9;
|
412 |
|
413 |
if (parent_open)
|
414 |
s->is_parent = 1;
|
415 |
else
|
416 |
s->is_parent = 0;
|
417 |
|
418 |
// try to open parent images, if exist
|
419 |
if (vmdk_parent_open(bs, filename) != 0) |
420 |
goto fail;
|
421 |
// write the CID once after the image creation
|
422 |
s->parent_cid = vmdk_read_cid(bs,1);
|
423 |
} else {
|
424 |
goto fail;
|
425 |
} |
426 |
|
427 |
/* read the L1 table */
|
428 |
l1_size = s->l1_size * sizeof(uint32_t);
|
429 |
s->l1_table = qemu_malloc(l1_size); |
430 |
if (bdrv_pread(s->hd, s->l1_table_offset, s->l1_table, l1_size) != l1_size)
|
431 |
goto fail;
|
432 |
for(i = 0; i < s->l1_size; i++) { |
433 |
le32_to_cpus(&s->l1_table[i]); |
434 |
} |
435 |
|
436 |
if (s->l1_backup_table_offset) {
|
437 |
s->l1_backup_table = qemu_malloc(l1_size); |
438 |
if (bdrv_pread(s->hd, s->l1_backup_table_offset, s->l1_backup_table, l1_size) != l1_size)
|
439 |
goto fail;
|
440 |
for(i = 0; i < s->l1_size; i++) { |
441 |
le32_to_cpus(&s->l1_backup_table[i]); |
442 |
} |
443 |
} |
444 |
|
445 |
s->l2_cache = qemu_malloc(s->l2_size * L2_CACHE_SIZE * sizeof(uint32_t));
|
446 |
return 0; |
447 |
fail:
|
448 |
qemu_free(s->l1_backup_table); |
449 |
qemu_free(s->l1_table); |
450 |
qemu_free(s->l2_cache); |
451 |
bdrv_delete(s->hd); |
452 |
return -1; |
453 |
} |
454 |
|
455 |
static uint64_t get_cluster_offset(BlockDriverState *bs, VmdkMetaData *m_data,
|
456 |
uint64_t offset, int allocate);
|
457 |
|
458 |
static int get_whole_cluster(BlockDriverState *bs, uint64_t cluster_offset, |
459 |
uint64_t offset, int allocate)
|
460 |
{ |
461 |
uint64_t parent_cluster_offset; |
462 |
BDRVVmdkState *s = bs->opaque; |
463 |
uint8_t whole_grain[s->cluster_sectors*512]; // 128 sectors * 512 bytes each = grain size 64KB |
464 |
|
465 |
// we will be here if it's first write on non-exist grain(cluster).
|
466 |
// try to read from parent image, if exist
|
467 |
if (s->hd->backing_hd) {
|
468 |
BDRVVmdkState *ps = s->hd->backing_hd->opaque; |
469 |
|
470 |
if (!vmdk_is_cid_valid(bs))
|
471 |
return -1; |
472 |
|
473 |
parent_cluster_offset = get_cluster_offset(s->hd->backing_hd, NULL, offset, allocate);
|
474 |
|
475 |
if (parent_cluster_offset) {
|
476 |
BDRVVmdkState *act_s = activeBDRV.hd->opaque; |
477 |
|
478 |
if (bdrv_pread(ps->hd, parent_cluster_offset, whole_grain, ps->cluster_sectors*512) != ps->cluster_sectors*512) |
479 |
return -1; |
480 |
|
481 |
//Write grain only into the active image
|
482 |
if (bdrv_pwrite(act_s->hd, activeBDRV.cluster_offset << 9, whole_grain, sizeof(whole_grain)) != sizeof(whole_grain)) |
483 |
return -1; |
484 |
} |
485 |
} |
486 |
return 0; |
487 |
} |
488 |
|
489 |
static int vmdk_L2update(BlockDriverState *bs, VmdkMetaData *m_data) |
490 |
{ |
491 |
BDRVVmdkState *s = bs->opaque; |
492 |
|
493 |
/* update L2 table */
|
494 |
if (bdrv_pwrite(s->hd, ((int64_t)m_data->l2_offset * 512) + (m_data->l2_index * sizeof(m_data->offset)), |
495 |
&(m_data->offset), sizeof(m_data->offset)) != sizeof(m_data->offset)) |
496 |
return -1; |
497 |
/* update backup L2 table */
|
498 |
if (s->l1_backup_table_offset != 0) { |
499 |
m_data->l2_offset = s->l1_backup_table[m_data->l1_index]; |
500 |
if (bdrv_pwrite(s->hd, ((int64_t)m_data->l2_offset * 512) + (m_data->l2_index * sizeof(m_data->offset)), |
501 |
&(m_data->offset), sizeof(m_data->offset)) != sizeof(m_data->offset)) |
502 |
return -1; |
503 |
} |
504 |
|
505 |
return 0; |
506 |
} |
507 |
|
508 |
static uint64_t get_cluster_offset(BlockDriverState *bs, VmdkMetaData *m_data,
|
509 |
uint64_t offset, int allocate)
|
510 |
{ |
511 |
BDRVVmdkState *s = bs->opaque; |
512 |
unsigned int l1_index, l2_offset, l2_index; |
513 |
int min_index, i, j;
|
514 |
uint32_t min_count, *l2_table, tmp = 0;
|
515 |
uint64_t cluster_offset; |
516 |
|
517 |
if (m_data)
|
518 |
m_data->valid = 0;
|
519 |
|
520 |
l1_index = (offset >> 9) / s->l1_entry_sectors;
|
521 |
if (l1_index >= s->l1_size)
|
522 |
return 0; |
523 |
l2_offset = s->l1_table[l1_index]; |
524 |
if (!l2_offset)
|
525 |
return 0; |
526 |
for(i = 0; i < L2_CACHE_SIZE; i++) { |
527 |
if (l2_offset == s->l2_cache_offsets[i]) {
|
528 |
/* increment the hit count */
|
529 |
if (++s->l2_cache_counts[i] == 0xffffffff) { |
530 |
for(j = 0; j < L2_CACHE_SIZE; j++) { |
531 |
s->l2_cache_counts[j] >>= 1;
|
532 |
} |
533 |
} |
534 |
l2_table = s->l2_cache + (i * s->l2_size); |
535 |
goto found;
|
536 |
} |
537 |
} |
538 |
/* not found: load a new entry in the least used one */
|
539 |
min_index = 0;
|
540 |
min_count = 0xffffffff;
|
541 |
for(i = 0; i < L2_CACHE_SIZE; i++) { |
542 |
if (s->l2_cache_counts[i] < min_count) {
|
543 |
min_count = s->l2_cache_counts[i]; |
544 |
min_index = i; |
545 |
} |
546 |
} |
547 |
l2_table = s->l2_cache + (min_index * s->l2_size); |
548 |
if (bdrv_pread(s->hd, (int64_t)l2_offset * 512, l2_table, s->l2_size * sizeof(uint32_t)) != |
549 |
s->l2_size * sizeof(uint32_t))
|
550 |
return 0; |
551 |
|
552 |
s->l2_cache_offsets[min_index] = l2_offset; |
553 |
s->l2_cache_counts[min_index] = 1;
|
554 |
found:
|
555 |
l2_index = ((offset >> 9) / s->cluster_sectors) % s->l2_size;
|
556 |
cluster_offset = le32_to_cpu(l2_table[l2_index]); |
557 |
|
558 |
if (!cluster_offset) {
|
559 |
if (!allocate)
|
560 |
return 0; |
561 |
// Avoid the L2 tables update for the images that have snapshots.
|
562 |
if (!s->is_parent) {
|
563 |
cluster_offset = bdrv_getlength(s->hd); |
564 |
bdrv_truncate(s->hd, cluster_offset + (s->cluster_sectors << 9));
|
565 |
|
566 |
cluster_offset >>= 9;
|
567 |
tmp = cpu_to_le32(cluster_offset); |
568 |
l2_table[l2_index] = tmp; |
569 |
// Save the active image state
|
570 |
activeBDRV.cluster_offset = cluster_offset; |
571 |
activeBDRV.hd = bs; |
572 |
} |
573 |
/* First of all we write grain itself, to avoid race condition
|
574 |
* that may to corrupt the image.
|
575 |
* This problem may occur because of insufficient space on host disk
|
576 |
* or inappropriate VM shutdown.
|
577 |
*/
|
578 |
if (get_whole_cluster(bs, cluster_offset, offset, allocate) == -1) |
579 |
return 0; |
580 |
|
581 |
if (m_data) {
|
582 |
m_data->offset = tmp; |
583 |
m_data->l1_index = l1_index; |
584 |
m_data->l2_index = l2_index; |
585 |
m_data->l2_offset = l2_offset; |
586 |
m_data->valid = 1;
|
587 |
} |
588 |
} |
589 |
cluster_offset <<= 9;
|
590 |
return cluster_offset;
|
591 |
} |
592 |
|
593 |
static int vmdk_is_allocated(BlockDriverState *bs, int64_t sector_num, |
594 |
int nb_sectors, int *pnum) |
595 |
{ |
596 |
BDRVVmdkState *s = bs->opaque; |
597 |
int index_in_cluster, n;
|
598 |
uint64_t cluster_offset; |
599 |
|
600 |
cluster_offset = get_cluster_offset(bs, NULL, sector_num << 9, 0); |
601 |
index_in_cluster = sector_num % s->cluster_sectors; |
602 |
n = s->cluster_sectors - index_in_cluster; |
603 |
if (n > nb_sectors)
|
604 |
n = nb_sectors; |
605 |
*pnum = n; |
606 |
return (cluster_offset != 0); |
607 |
} |
608 |
|
609 |
static int vmdk_read(BlockDriverState *bs, int64_t sector_num, |
610 |
uint8_t *buf, int nb_sectors)
|
611 |
{ |
612 |
BDRVVmdkState *s = bs->opaque; |
613 |
int index_in_cluster, n, ret;
|
614 |
uint64_t cluster_offset; |
615 |
|
616 |
while (nb_sectors > 0) { |
617 |
cluster_offset = get_cluster_offset(bs, NULL, sector_num << 9, 0); |
618 |
index_in_cluster = sector_num % s->cluster_sectors; |
619 |
n = s->cluster_sectors - index_in_cluster; |
620 |
if (n > nb_sectors)
|
621 |
n = nb_sectors; |
622 |
if (!cluster_offset) {
|
623 |
// try to read from parent image, if exist
|
624 |
if (s->hd->backing_hd) {
|
625 |
if (!vmdk_is_cid_valid(bs))
|
626 |
return -1; |
627 |
ret = bdrv_read(s->hd->backing_hd, sector_num, buf, n); |
628 |
if (ret < 0) |
629 |
return -1; |
630 |
} else {
|
631 |
memset(buf, 0, 512 * n); |
632 |
} |
633 |
} else {
|
634 |
if(bdrv_pread(s->hd, cluster_offset + index_in_cluster * 512, buf, n * 512) != n * 512) |
635 |
return -1; |
636 |
} |
637 |
nb_sectors -= n; |
638 |
sector_num += n; |
639 |
buf += n * 512;
|
640 |
} |
641 |
return 0; |
642 |
} |
643 |
|
644 |
static int vmdk_write(BlockDriverState *bs, int64_t sector_num, |
645 |
const uint8_t *buf, int nb_sectors) |
646 |
{ |
647 |
BDRVVmdkState *s = bs->opaque; |
648 |
VmdkMetaData m_data; |
649 |
int index_in_cluster, n;
|
650 |
uint64_t cluster_offset; |
651 |
static int cid_update = 0; |
652 |
|
653 |
if (sector_num > bs->total_sectors) {
|
654 |
fprintf(stderr, |
655 |
"(VMDK) Wrong offset: sector_num=0x%" PRIx64
|
656 |
" total_sectors=0x%" PRIx64 "\n", |
657 |
sector_num, bs->total_sectors); |
658 |
return -1; |
659 |
} |
660 |
|
661 |
while (nb_sectors > 0) { |
662 |
index_in_cluster = sector_num & (s->cluster_sectors - 1);
|
663 |
n = s->cluster_sectors - index_in_cluster; |
664 |
if (n > nb_sectors)
|
665 |
n = nb_sectors; |
666 |
cluster_offset = get_cluster_offset(bs, &m_data, sector_num << 9, 1); |
667 |
if (!cluster_offset)
|
668 |
return -1; |
669 |
|
670 |
if (bdrv_pwrite(s->hd, cluster_offset + index_in_cluster * 512, buf, n * 512) != n * 512) |
671 |
return -1; |
672 |
if (m_data.valid) {
|
673 |
/* update L2 tables */
|
674 |
if (vmdk_L2update(bs, &m_data) == -1) |
675 |
return -1; |
676 |
} |
677 |
nb_sectors -= n; |
678 |
sector_num += n; |
679 |
buf += n * 512;
|
680 |
|
681 |
// update CID on the first write every time the virtual disk is opened
|
682 |
if (!cid_update) {
|
683 |
vmdk_write_cid(bs, time(NULL));
|
684 |
cid_update++; |
685 |
} |
686 |
} |
687 |
return 0; |
688 |
} |
689 |
|
690 |
static int vmdk_create(const char *filename, QEMUOptionParameter *options) |
691 |
{ |
692 |
int fd, i;
|
693 |
VMDK4Header header; |
694 |
uint32_t tmp, magic, grains, gd_size, gt_size, gt_count; |
695 |
static const char desc_template[] = |
696 |
"# Disk DescriptorFile\n"
|
697 |
"version=1\n"
|
698 |
"CID=%x\n"
|
699 |
"parentCID=ffffffff\n"
|
700 |
"createType=\"monolithicSparse\"\n"
|
701 |
"\n"
|
702 |
"# Extent description\n"
|
703 |
"RW %" PRId64 " SPARSE \"%s\"\n" |
704 |
"\n"
|
705 |
"# The Disk Data Base \n"
|
706 |
"#DDB\n"
|
707 |
"\n"
|
708 |
"ddb.virtualHWVersion = \"%d\"\n"
|
709 |
"ddb.geometry.cylinders = \"%" PRId64 "\"\n" |
710 |
"ddb.geometry.heads = \"16\"\n"
|
711 |
"ddb.geometry.sectors = \"63\"\n"
|
712 |
"ddb.adapterType = \"ide\"\n";
|
713 |
char desc[1024]; |
714 |
const char *real_filename, *temp_str; |
715 |
int64_t total_size = 0;
|
716 |
const char *backing_file = NULL; |
717 |
int flags = 0; |
718 |
|
719 |
// Read out options
|
720 |
while (options && options->name) {
|
721 |
if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
|
722 |
total_size = options->value.n / 512;
|
723 |
} else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) { |
724 |
backing_file = options->value.s; |
725 |
} else if (!strcmp(options->name, BLOCK_OPT_COMPAT6)) { |
726 |
flags |= options->value.n ? BLOCK_FLAG_COMPAT6: 0;
|
727 |
} |
728 |
options++; |
729 |
} |
730 |
|
731 |
/* XXX: add support for backing file */
|
732 |
if (backing_file) {
|
733 |
return vmdk_snapshot_create(filename, backing_file);
|
734 |
} |
735 |
|
736 |
fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, |
737 |
0644);
|
738 |
if (fd < 0) |
739 |
return -1; |
740 |
magic = cpu_to_be32(VMDK4_MAGIC); |
741 |
memset(&header, 0, sizeof(header)); |
742 |
header.version = cpu_to_le32(1);
|
743 |
header.flags = cpu_to_le32(3); /* ?? */ |
744 |
header.capacity = cpu_to_le64(total_size); |
745 |
header.granularity = cpu_to_le64(128);
|
746 |
header.num_gtes_per_gte = cpu_to_le32(512);
|
747 |
|
748 |
grains = (total_size + header.granularity - 1) / header.granularity;
|
749 |
gt_size = ((header.num_gtes_per_gte * sizeof(uint32_t)) + 511) >> 9; |
750 |
gt_count = (grains + header.num_gtes_per_gte - 1) / header.num_gtes_per_gte;
|
751 |
gd_size = (gt_count * sizeof(uint32_t) + 511) >> 9; |
752 |
|
753 |
header.desc_offset = 1;
|
754 |
header.desc_size = 20;
|
755 |
header.rgd_offset = header.desc_offset + header.desc_size; |
756 |
header.gd_offset = header.rgd_offset + gd_size + (gt_size * gt_count); |
757 |
header.grain_offset = |
758 |
((header.gd_offset + gd_size + (gt_size * gt_count) + |
759 |
header.granularity - 1) / header.granularity) *
|
760 |
header.granularity; |
761 |
|
762 |
header.desc_offset = cpu_to_le64(header.desc_offset); |
763 |
header.desc_size = cpu_to_le64(header.desc_size); |
764 |
header.rgd_offset = cpu_to_le64(header.rgd_offset); |
765 |
header.gd_offset = cpu_to_le64(header.gd_offset); |
766 |
header.grain_offset = cpu_to_le64(header.grain_offset); |
767 |
|
768 |
header.check_bytes[0] = 0xa; |
769 |
header.check_bytes[1] = 0x20; |
770 |
header.check_bytes[2] = 0xd; |
771 |
header.check_bytes[3] = 0xa; |
772 |
|
773 |
/* write all the data */
|
774 |
write(fd, &magic, sizeof(magic));
|
775 |
write(fd, &header, sizeof(header));
|
776 |
|
777 |
ftruncate(fd, header.grain_offset << 9);
|
778 |
|
779 |
/* write grain directory */
|
780 |
lseek(fd, le64_to_cpu(header.rgd_offset) << 9, SEEK_SET);
|
781 |
for (i = 0, tmp = header.rgd_offset + gd_size; |
782 |
i < gt_count; i++, tmp += gt_size) |
783 |
write(fd, &tmp, sizeof(tmp));
|
784 |
|
785 |
/* write backup grain directory */
|
786 |
lseek(fd, le64_to_cpu(header.gd_offset) << 9, SEEK_SET);
|
787 |
for (i = 0, tmp = header.gd_offset + gd_size; |
788 |
i < gt_count; i++, tmp += gt_size) |
789 |
write(fd, &tmp, sizeof(tmp));
|
790 |
|
791 |
/* compose the descriptor */
|
792 |
real_filename = filename; |
793 |
if ((temp_str = strrchr(real_filename, '\\')) != NULL) |
794 |
real_filename = temp_str + 1;
|
795 |
if ((temp_str = strrchr(real_filename, '/')) != NULL) |
796 |
real_filename = temp_str + 1;
|
797 |
if ((temp_str = strrchr(real_filename, ':')) != NULL) |
798 |
real_filename = temp_str + 1;
|
799 |
snprintf(desc, sizeof(desc), desc_template, (unsigned int)time(NULL), |
800 |
total_size, real_filename, |
801 |
(flags & BLOCK_FLAG_COMPAT6 ? 6 : 4), |
802 |
total_size / (int64_t)(63 * 16)); |
803 |
|
804 |
/* write the descriptor */
|
805 |
lseek(fd, le64_to_cpu(header.desc_offset) << 9, SEEK_SET);
|
806 |
write(fd, desc, strlen(desc)); |
807 |
|
808 |
close(fd); |
809 |
return 0; |
810 |
} |
811 |
|
812 |
static void vmdk_close(BlockDriverState *bs) |
813 |
{ |
814 |
BDRVVmdkState *s = bs->opaque; |
815 |
|
816 |
qemu_free(s->l1_table); |
817 |
qemu_free(s->l2_cache); |
818 |
// try to close parent image, if exist
|
819 |
vmdk_parent_close(s->hd); |
820 |
bdrv_delete(s->hd); |
821 |
} |
822 |
|
823 |
static void vmdk_flush(BlockDriverState *bs) |
824 |
{ |
825 |
BDRVVmdkState *s = bs->opaque; |
826 |
bdrv_flush(s->hd); |
827 |
} |
828 |
|
829 |
|
830 |
static QEMUOptionParameter vmdk_create_options[] = {
|
831 |
{ |
832 |
.name = BLOCK_OPT_SIZE, |
833 |
.type = OPT_SIZE, |
834 |
.help = "Virtual disk size"
|
835 |
}, |
836 |
{ |
837 |
.name = BLOCK_OPT_BACKING_FILE, |
838 |
.type = OPT_STRING, |
839 |
.help = "File name of a base image"
|
840 |
}, |
841 |
{ |
842 |
.name = BLOCK_OPT_COMPAT6, |
843 |
.type = OPT_FLAG, |
844 |
.help = "VMDK version 6 image"
|
845 |
}, |
846 |
{ NULL }
|
847 |
}; |
848 |
|
849 |
static BlockDriver bdrv_vmdk = {
|
850 |
.format_name = "vmdk",
|
851 |
.instance_size = sizeof(BDRVVmdkState),
|
852 |
.bdrv_probe = vmdk_probe, |
853 |
.bdrv_open = vmdk_open, |
854 |
.bdrv_read = vmdk_read, |
855 |
.bdrv_write = vmdk_write, |
856 |
.bdrv_close = vmdk_close, |
857 |
.bdrv_create = vmdk_create, |
858 |
.bdrv_flush = vmdk_flush, |
859 |
.bdrv_is_allocated = vmdk_is_allocated, |
860 |
|
861 |
.create_options = vmdk_create_options, |
862 |
}; |
863 |
|
864 |
static void bdrv_vmdk_init(void) |
865 |
{ |
866 |
bdrv_register(&bdrv_vmdk); |
867 |
} |
868 |
|
869 |
block_init(bdrv_vmdk_init); |