Revision 53c2e716 block/vmdk.c
| b/block/vmdk.c | ||
|---|---|---|
| 187 | 187 |
static int vmdk_snapshot_create(const char *filename, const char *backing_file) |
| 188 | 188 |
{
|
| 189 | 189 |
int snp_fd, p_fd; |
| 190 |
int ret; |
|
| 190 | 191 |
uint32_t p_cid; |
| 191 | 192 |
char *p_name, *gd_buf, *rgd_buf; |
| 192 | 193 |
const char *real_filename, *temp_str; |
| ... | ... | |
| 211 | 212 |
|
| 212 | 213 |
snp_fd = open(filename, O_RDWR | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, 0644); |
| 213 | 214 |
if (snp_fd < 0) |
| 214 |
return -1;
|
|
| 215 |
return -errno;
|
|
| 215 | 216 |
p_fd = open(backing_file, O_RDONLY | O_BINARY | O_LARGEFILE); |
| 216 | 217 |
if (p_fd < 0) {
|
| 217 | 218 |
close(snp_fd); |
| 218 |
return -1;
|
|
| 219 |
return -errno;
|
|
| 219 | 220 |
} |
| 220 | 221 |
|
| 221 | 222 |
/* read the header */ |
| 222 |
if (lseek(p_fd, 0x0, SEEK_SET) == -1) |
|
| 223 |
if (lseek(p_fd, 0x0, SEEK_SET) == -1) {
|
|
| 224 |
ret = -errno; |
|
| 223 | 225 |
goto fail; |
| 224 |
if (read(p_fd, hdr, HEADER_SIZE) != HEADER_SIZE) |
|
| 226 |
} |
|
| 227 |
if (read(p_fd, hdr, HEADER_SIZE) != HEADER_SIZE) {
|
|
| 228 |
ret = -errno; |
|
| 225 | 229 |
goto fail; |
| 230 |
} |
|
| 226 | 231 |
|
| 227 | 232 |
/* write the header */ |
| 228 |
if (lseek(snp_fd, 0x0, SEEK_SET) == -1) |
|
| 233 |
if (lseek(snp_fd, 0x0, SEEK_SET) == -1) {
|
|
| 234 |
ret = -errno; |
|
| 229 | 235 |
goto fail; |
| 230 |
if (write(snp_fd, hdr, HEADER_SIZE) == -1) |
|
| 236 |
} |
|
| 237 |
if (write(snp_fd, hdr, HEADER_SIZE) == -1) {
|
|
| 238 |
ret = -errno; |
|
| 231 | 239 |
goto fail; |
| 240 |
} |
|
| 232 | 241 |
|
| 233 | 242 |
memset(&header, 0, sizeof(header)); |
| 234 | 243 |
memcpy(&header,&hdr[4], sizeof(header)); // skip the VMDK4_MAGIC |
| 235 | 244 |
|
| 236 |
if (ftruncate(snp_fd, header.grain_offset << 9)) |
|
| 245 |
if (ftruncate(snp_fd, header.grain_offset << 9)) {
|
|
| 246 |
ret = -errno; |
|
| 237 | 247 |
goto fail; |
| 248 |
} |
|
| 238 | 249 |
/* the descriptor offset = 0x200 */ |
| 239 |
if (lseek(p_fd, 0x200, SEEK_SET) == -1) |
|
| 250 |
if (lseek(p_fd, 0x200, SEEK_SET) == -1) {
|
|
| 251 |
ret = -errno; |
|
| 240 | 252 |
goto fail; |
| 241 |
if (read(p_fd, p_desc, DESC_SIZE) != DESC_SIZE) |
|
| 253 |
} |
|
| 254 |
if (read(p_fd, p_desc, DESC_SIZE) != DESC_SIZE) {
|
|
| 255 |
ret = -errno; |
|
| 242 | 256 |
goto fail; |
| 257 |
} |
|
| 243 | 258 |
|
| 244 | 259 |
if ((p_name = strstr(p_desc,"CID")) != NULL) {
|
| 245 | 260 |
p_name += sizeof("CID");
|
| ... | ... | |
| 258 | 273 |
(uint32_t)header.capacity, real_filename); |
| 259 | 274 |
|
| 260 | 275 |
/* write the descriptor */ |
| 261 |
if (lseek(snp_fd, 0x200, SEEK_SET) == -1) |
|
| 276 |
if (lseek(snp_fd, 0x200, SEEK_SET) == -1) {
|
|
| 277 |
ret = -errno; |
|
| 262 | 278 |
goto fail; |
| 263 |
if (write(snp_fd, s_desc, strlen(s_desc)) == -1) |
|
| 279 |
} |
|
| 280 |
if (write(snp_fd, s_desc, strlen(s_desc)) == -1) {
|
|
| 281 |
ret = -errno; |
|
| 264 | 282 |
goto fail; |
| 283 |
} |
|
| 265 | 284 |
|
| 266 | 285 |
gd_offset = header.gd_offset * SECTOR_SIZE; // offset of GD table |
| 267 | 286 |
rgd_offset = header.rgd_offset * SECTOR_SIZE; // offset of RGD table |
| ... | ... | |
| 271 | 290 |
* 512 GTE per GT, each GTE points to grain |
| 272 | 291 |
*/ |
| 273 | 292 |
gt_size = (int64_t)header.num_gtes_per_gte * header.granularity * SECTOR_SIZE; |
| 274 |
if (!gt_size) |
|
| 293 |
if (!gt_size) {
|
|
| 294 |
ret = -EINVAL; |
|
| 275 | 295 |
goto fail; |
| 296 |
} |
|
| 276 | 297 |
gde_entries = (uint32_t)(capacity / gt_size); // number of gde/rgde |
| 277 | 298 |
gd_size = gde_entries * sizeof(uint32_t); |
| 278 | 299 |
|
| 279 | 300 |
/* write RGD */ |
| 280 | 301 |
rgd_buf = qemu_malloc(gd_size); |
| 281 |
if (lseek(p_fd, rgd_offset, SEEK_SET) == -1) |
|
| 302 |
if (lseek(p_fd, rgd_offset, SEEK_SET) == -1) {
|
|
| 303 |
ret = -errno; |
|
| 282 | 304 |
goto fail_rgd; |
| 283 |
if (read(p_fd, rgd_buf, gd_size) != gd_size) |
|
| 305 |
} |
|
| 306 |
if (read(p_fd, rgd_buf, gd_size) != gd_size) {
|
|
| 307 |
ret = -errno; |
|
| 284 | 308 |
goto fail_rgd; |
| 285 |
if (lseek(snp_fd, rgd_offset, SEEK_SET) == -1) |
|
| 309 |
} |
|
| 310 |
if (lseek(snp_fd, rgd_offset, SEEK_SET) == -1) {
|
|
| 311 |
ret = -errno; |
|
| 286 | 312 |
goto fail_rgd; |
| 287 |
if (write(snp_fd, rgd_buf, gd_size) == -1) |
|
| 313 |
} |
|
| 314 |
if (write(snp_fd, rgd_buf, gd_size) == -1) {
|
|
| 315 |
ret = -errno; |
|
| 288 | 316 |
goto fail_rgd; |
| 317 |
} |
|
| 289 | 318 |
qemu_free(rgd_buf); |
| 290 | 319 |
|
| 291 | 320 |
/* write GD */ |
| 292 | 321 |
gd_buf = qemu_malloc(gd_size); |
| 293 |
if (lseek(p_fd, gd_offset, SEEK_SET) == -1) |
|
| 322 |
if (lseek(p_fd, gd_offset, SEEK_SET) == -1) {
|
|
| 323 |
ret = -errno; |
|
| 294 | 324 |
goto fail_gd; |
| 295 |
if (read(p_fd, gd_buf, gd_size) != gd_size) |
|
| 325 |
} |
|
| 326 |
if (read(p_fd, gd_buf, gd_size) != gd_size) {
|
|
| 327 |
ret = -errno; |
|
| 296 | 328 |
goto fail_gd; |
| 297 |
if (lseek(snp_fd, gd_offset, SEEK_SET) == -1) |
|
| 329 |
} |
|
| 330 |
if (lseek(snp_fd, gd_offset, SEEK_SET) == -1) {
|
|
| 331 |
ret = -errno; |
|
| 298 | 332 |
goto fail_gd; |
| 299 |
if (write(snp_fd, gd_buf, gd_size) == -1) |
|
| 333 |
} |
|
| 334 |
if (write(snp_fd, gd_buf, gd_size) == -1) {
|
|
| 335 |
ret = -errno; |
|
| 300 | 336 |
goto fail_gd; |
| 337 |
} |
|
| 301 | 338 |
qemu_free(gd_buf); |
| 302 | 339 |
|
| 303 | 340 |
close(p_fd); |
| ... | ... | |
| 311 | 348 |
fail: |
| 312 | 349 |
close(p_fd); |
| 313 | 350 |
close(snp_fd); |
| 314 |
return -1;
|
|
| 351 |
return ret;
|
|
| 315 | 352 |
} |
| 316 | 353 |
|
| 317 | 354 |
static void vmdk_parent_close(BlockDriverState *bs) |
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