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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>
This commit is contained in:
Kevin Wolf 2011-05-24 16:40:02 +02:00
parent 39aa9a12cc
commit 9e2a3701a1
1 changed files with 8 additions and 4 deletions
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12
block/qcow2-cluster.c
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@ -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;
}