Revision db3a964f
| b/block/qcow2-refcount.c | ||
|---|---|---|
| 269 | 269 |
} |
| 270 | 270 |
|
| 271 | 271 |
/* XXX: cache several refcount block clusters ? */ |
| 272 |
static int update_refcount(BlockDriverState *bs, |
|
| 273 |
int64_t offset, int64_t length, |
|
| 274 |
int addend) |
|
| 272 |
static int QEMU_WARN_UNUSED_RESULT update_refcount(BlockDriverState *bs, |
|
| 273 |
int64_t offset, int64_t length, int addend) |
|
| 275 | 274 |
{
|
| 276 | 275 |
BDRVQcowState *s = bs->opaque; |
| 277 | 276 |
int64_t start, last, cluster_offset; |
| ... | ... | |
| 415 | 414 |
int64_t qcow2_alloc_clusters(BlockDriverState *bs, int64_t size) |
| 416 | 415 |
{
|
| 417 | 416 |
int64_t offset; |
| 417 |
int ret; |
|
| 418 | 418 |
|
| 419 | 419 |
offset = alloc_clusters_noref(bs, size); |
| 420 |
update_refcount(bs, offset, size, 1); |
|
| 420 |
ret = update_refcount(bs, offset, size, 1); |
|
| 421 |
if (ret < 0) {
|
|
| 422 |
return ret; |
|
| 423 |
} |
|
| 421 | 424 |
return offset; |
| 422 | 425 |
} |
| 423 | 426 |
|
| ... | ... | |
| 464 | 467 |
void qcow2_free_clusters(BlockDriverState *bs, |
| 465 | 468 |
int64_t offset, int64_t size) |
| 466 | 469 |
{
|
| 467 |
update_refcount(bs, offset, size, -1); |
|
| 470 |
int ret; |
|
| 471 |
|
|
| 472 |
ret = update_refcount(bs, offset, size, -1); |
|
| 473 |
if (ret < 0) {
|
|
| 474 |
fprintf(stderr, "qcow2_free_clusters failed: %s\n", strerror(-ret)); |
|
| 475 |
abort(); |
|
| 476 |
} |
|
| 468 | 477 |
} |
| 469 | 478 |
|
| 470 | 479 |
/* |
| ... | ... | |
| 573 | 582 |
if (offset & QCOW_OFLAG_COMPRESSED) {
|
| 574 | 583 |
nb_csectors = ((offset >> s->csize_shift) & |
| 575 | 584 |
s->csize_mask) + 1; |
| 576 |
if (addend != 0) |
|
| 577 |
update_refcount(bs, (offset & s->cluster_offset_mask) & ~511, |
|
| 578 |
nb_csectors * 512, addend); |
|
| 585 |
if (addend != 0) {
|
|
| 586 |
int ret; |
|
| 587 |
ret = update_refcount(bs, |
|
| 588 |
(offset & s->cluster_offset_mask) & ~511, |
|
| 589 |
nb_csectors * 512, addend); |
|
| 590 |
if (ret < 0) {
|
|
| 591 |
goto fail; |
|
| 592 |
} |
|
| 593 |
} |
|
| 579 | 594 |
/* compressed clusters are never modified */ |
| 580 | 595 |
refcount = 2; |
| 581 | 596 |
} else {
|
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