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qcow2: Batch flushes for COW

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qcow2 calls bdrv_flush() after performing COW in order to ensure that the
L2 table change is never written before the copy is safe on disk. Now that the
L2 table is cached, we can wait with flushing until we write out the next L2
table.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2011-01-14 15:55:38 +01:00
parent 29c1a7301a
commit 3de0a2944b
3 changed files with 19 additions and 4 deletions
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2
block/qcow2-cluster.c
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@ -637,7 +637,7 @@ int qcow2_alloc_cluster_link_l2(BlockDriverState *bs, QCowL2Meta *m)
* handled.
*/
if (cow) {
bdrv_flush(bs->file);
qcow2_cache_depends_on_flush(s->l2_table_cache);
}
qcow2_cache_set_dependency(bs, s->l2_table_cache, s->refcount_block_cache);