diff options
| author | Kevin Wolf <kwolf@redhat.com> | 2011-05-24 16:40:02 +0200 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2011-06-15 14:36:15 +0200 |
| commit | 9e2a3701a1fcfec0316b9dc1a6cd62869de5542c (patch) | |
| tree | 64b22b9f494e444f705dae7dd355060036b11c95 /block | |
| parent | 39aa9a12ccbfd1ca2253fd1dc584bfb13670be47 (diff) | |
| download | qemu-9e2a3701a1fcfec0316b9dc1a6cd62869de5542c.tar.gz | |
qcow2: Fix in-flight list after qcow2_cache_put failure
If qcow2_cache_put returns an error during cluster allocation and the
allocation fails, it must be removed from the list of in-flight allocations.
Otherwise we'd get a loop in the list when the ACB is used for the next
allocation.
Luckily, this qcow2_cache_put shouldn't fail anyway because the L2 table is
only read, so that qcow2_cache_put doesn't even involve I/O.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'block')
| -rw-r--r-- | block/qcow2-cluster.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c index c9e7bbd9d6..882f50a80b 100644 --- a/block/qcow2-cluster.c +++ b/block/qcow2-cluster.c @@ -796,8 +796,8 @@ int qcow2_alloc_cluster_offset(BlockDriverState *bs, uint64_t offset, m->depends_on = old_alloc; m->nb_clusters = 0; *num = 0; - ret = 0; - goto fail; + + goto out_wait_dependency; } } } @@ -812,7 +812,6 @@ int qcow2_alloc_cluster_offset(BlockDriverState *bs, uint64_t offset, cluster_offset = qcow2_alloc_clusters(bs, nb_clusters * s->cluster_size); if (cluster_offset < 0) { - QLIST_REMOVE(m, next_in_flight); ret = cluster_offset; goto fail; } @@ -825,7 +824,7 @@ int qcow2_alloc_cluster_offset(BlockDriverState *bs, uint64_t offset, out: ret = qcow2_cache_put(bs, s->l2_table_cache, (void**) &l2_table); if (ret < 0) { - return ret; + goto fail_put; } m->nb_available = MIN(nb_clusters << (s->cluster_bits - 9), n_end); @@ -835,8 +834,13 @@ out: return 0; +out_wait_dependency: + return qcow2_cache_put(bs, s->l2_table_cache, (void**) &l2_table); + fail: qcow2_cache_put(bs, s->l2_table_cache, (void**) &l2_table); +fail_put: + QLIST_REMOVE(m, next_in_flight); return ret; } |