Revision 4c1612d9 block/qcow2-cluster.c
| b/block/qcow2-cluster.c | ||
|---|---|---|
| 578 | 578 |
return cluster_offset; |
| 579 | 579 |
} |
| 580 | 580 |
|
| 581 |
/* |
|
| 582 |
* Write L2 table updates to disk, writing whole sectors to avoid a |
|
| 583 |
* read-modify-write in bdrv_pwrite |
|
| 584 |
*/ |
|
| 585 |
#define L2_ENTRIES_PER_SECTOR (512 / 8) |
|
| 586 |
static int write_l2_entries(BDRVQcowState *s, uint64_t *l2_table, |
|
| 587 |
uint64_t l2_offset, int l2_index, int num) |
|
| 588 |
{
|
|
| 589 |
int l2_start_index = l2_index & ~(L1_ENTRIES_PER_SECTOR - 1); |
|
| 590 |
int start_offset = (8 * l2_index) & ~511; |
|
| 591 |
int end_offset = (8 * (l2_index + num) + 511) & ~511; |
|
| 592 |
size_t len = end_offset - start_offset; |
|
| 593 |
|
|
| 594 |
if (bdrv_pwrite(s->hd, l2_offset + start_offset, &l2_table[l2_start_index], |
|
| 595 |
len) != len) |
|
| 596 |
{
|
|
| 597 |
return -1; |
|
| 598 |
} |
|
| 599 |
|
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| 600 |
return 0; |
|
| 601 |
} |
|
| 602 |
|
|
| 581 | 603 |
int qcow2_alloc_cluster_link_l2(BlockDriverState *bs, uint64_t cluster_offset, |
| 582 | 604 |
QCowL2Meta *m) |
| 583 | 605 |
{
|
| ... | ... | |
| 625 | 647 |
(i << s->cluster_bits)) | QCOW_OFLAG_COPIED); |
| 626 | 648 |
} |
| 627 | 649 |
|
| 628 |
if (bdrv_pwrite(s->hd, l2_offset + l2_index * sizeof(uint64_t), |
|
| 629 |
l2_table + l2_index, m->nb_clusters * sizeof(uint64_t)) != |
|
| 630 |
m->nb_clusters * sizeof(uint64_t)) |
|
| 650 |
if (write_l2_entries(s, l2_table, l2_offset, l2_index, m->nb_clusters) < 0) {
|
|
| 651 |
ret = -1; |
|
| 631 | 652 |
goto err; |
| 653 |
} |
|
| 632 | 654 |
|
| 633 | 655 |
for (i = 0; i < j; i++) |
| 634 | 656 |
qcow2_free_any_clusters(bs, |
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