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| author | Kevin Wolf <kwolf@redhat.com> | 2011-01-14 15:55:38 +0100 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2011-01-24 16:41:49 +0100 |
| commit | 3de0a2944bdb3047dce275560631834bcb4afe22 (patch) | |
| tree | 3549f925839388bae068f15ca148d5282ccd5beb /block/qcow2-cluster.c | |
| parent | 29c1a7301af752de6721e031d31faa48887204bd (diff) | |
| download | qemu-3de0a2944bdb3047dce275560631834bcb4afe22.tar.gz qemu-3de0a2944bdb3047dce275560631834bcb4afe22.tar.bz2 qemu-3de0a2944bdb3047dce275560631834bcb4afe22.zip | |
qcow2: Batch flushes for COW
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>
Diffstat (limited to 'block/qcow2-cluster.c')
| -rw-r--r-- | block/qcow2-cluster.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c index 76e7e07bdb..1c2003a8a4 100644 --- a/block/qcow2-cluster.c +++ b/block/qcow2-cluster.c @@ -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); |