Revision 35d7ace7 block/qcow2-snapshot.c
| b/block/qcow2-snapshot.c | ||
|---|---|---|
| 317 | 317 |
{
|
| 318 | 318 |
BDRVQcowState *s = bs->opaque; |
| 319 | 319 |
QCowSnapshot *sn; |
| 320 |
int i, snapshot_index, l1_size2; |
|
| 320 |
int i, snapshot_index; |
|
| 321 |
int cur_l1_bytes, sn_l1_bytes; |
|
| 321 | 322 |
|
| 322 | 323 |
snapshot_index = find_snapshot_by_id_or_name(bs, snapshot_id); |
| 323 | 324 |
if (snapshot_index < 0) |
| ... | ... | |
| 330 | 331 |
if (qcow2_grow_l1_table(bs, sn->l1_size, true) < 0) |
| 331 | 332 |
goto fail; |
| 332 | 333 |
|
| 333 |
s->l1_size = sn->l1_size; |
|
| 334 |
l1_size2 = s->l1_size * sizeof(uint64_t); |
|
| 334 |
cur_l1_bytes = s->l1_size * sizeof(uint64_t); |
|
| 335 |
sn_l1_bytes = sn->l1_size * sizeof(uint64_t); |
|
| 336 |
|
|
| 337 |
if (cur_l1_bytes > sn_l1_bytes) {
|
|
| 338 |
memset(s->l1_table + sn->l1_size, 0, cur_l1_bytes - sn_l1_bytes); |
|
| 339 |
} |
|
| 340 |
|
|
| 335 | 341 |
/* copy the snapshot l1 table to the current l1 table */ |
| 336 | 342 |
if (bdrv_pread(bs->file, sn->l1_table_offset, |
| 337 |
s->l1_table, l1_size2) != l1_size2)
|
|
| 343 |
s->l1_table, sn_l1_bytes) < 0)
|
|
| 338 | 344 |
goto fail; |
| 339 | 345 |
if (bdrv_pwrite_sync(bs->file, s->l1_table_offset, |
| 340 |
s->l1_table, l1_size2) < 0)
|
|
| 346 |
s->l1_table, cur_l1_bytes) < 0)
|
|
| 341 | 347 |
goto fail; |
| 342 | 348 |
for(i = 0;i < s->l1_size; i++) {
|
| 343 | 349 |
be64_to_cpus(&s->l1_table[i]); |
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