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authorStefan Hajnoczi <stefanha@redhat.com>2013-03-04 15:02:32 +0100
committerStefan Hajnoczi <stefanha@redhat.com>2013-03-15 16:07:50 +0100
commitc1f5bafd70a8d9366570a3de472ef108415cd631 (patch)
tree2d074ff55407cfdab33e624972ecddda1604bb4b /block
parentf6977f15561973d4a67b6aa46da88aa678c505dd (diff)
qcow2: set L2 cache dependency in qcow2_alloc_bytes()
Compressed writes use qcow2_alloc_bytes() to allocate space with byte granularity. The affected clusters' refcounts will be incremented but we do not need to flush yet. Set a L2 cache dependency on the refcount block cache, so that the refcounts get written out before the L2 updates. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block')
-rw-r--r--block/qcow2-refcount.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c
index e8b5d0a4ac..4d9df5fe95 100644
--- a/block/qcow2-refcount.c
+++ b/block/qcow2-refcount.c
@@ -669,7 +669,11 @@ int64_t qcow2_alloc_bytes(BlockDriverState *bs, int size)
}
}
- bdrv_flush(bs->file);
+ /* The cluster refcount was incremented, either by qcow2_alloc_clusters()
+ * or explicitly by update_cluster_refcount(). Refcount blocks must be
+ * flushed before the caller's L2 table updates.
+ */
+ qcow2_cache_set_dependency(bs, s->l2_table_cache, s->refcount_block_cache);
return offset;
}