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qcow2: flush refcount cache correctly in qcow2_write_snapshots() 

Since qcow2 metadata is cached we need to flush the caches, not just the
underlying file.  Use bdrv_flush(bs) instead of bdrv_flush(bs->file).

Also add the error return path when bdrv_flush() fails and move the
flush after checking for qcow2_alloc_clusters() failure so that the
qcow2_alloc_clusters() error return value takes precedence.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
(cherry picked from commit f6977f1556)

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
This commit is contained in:
Stefan Hajnoczi 2013-03-04 15:02:31 +01:00 committed by Michael Roth
parent 02ea844746
commit 7d47b243d6
1 changed files with 4 additions and 1 deletions
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5
block/qcow2-snapshot.c
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@ -180,11 +180,14 @@ static int qcow2_write_snapshots(BlockDriverState *bs)
/* Allocate space for the new snapshot list */
snapshots_offset = qcow2_alloc_clusters(bs, snapshots_size);
bdrv_flush(bs->file);
offset = snapshots_offset;
if (offset < 0) {
return offset;
}
ret = bdrv_flush(bs);
if (ret < 0) {
return ret;
}
/* Write all snapshots to the new list */
for(i = 0; i < s->nb_snapshots; i++) {