diff options
| -rw-r--r-- | block/qcow2-refcount.c | 34 |
1 files changed, 18 insertions, 16 deletions
diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c index 3f2ed08466..4a2df5fb99 100644 --- a/block/qcow2-refcount.c +++ b/block/qcow2-refcount.c @@ -1399,14 +1399,14 @@ static int64_t realloc_refcount_block(BlockDriverState *bs, int reftable_index, fprintf(stderr, "Could not allocate new cluster: %s\n", strerror(-new_offset)); ret = new_offset; - goto fail; + goto done; } /* fetch current refcount block content */ ret = qcow2_cache_get(bs, s->refcount_block_cache, offset, &refcount_block); if (ret < 0) { fprintf(stderr, "Could not fetch refcount block: %s\n", strerror(-ret)); - goto fail; + goto fail_free_cluster; } /* new block has not yet been entered into refcount table, therefore it is @@ -1417,8 +1417,7 @@ static int64_t realloc_refcount_block(BlockDriverState *bs, int reftable_index, "check failed: %s\n", strerror(-ret)); /* the image will be marked corrupt, so don't even attempt on freeing * the cluster */ - new_offset = 0; - goto fail; + goto done; } /* write to new block */ @@ -1426,7 +1425,7 @@ static int64_t realloc_refcount_block(BlockDriverState *bs, int reftable_index, s->cluster_sectors); if (ret < 0) { fprintf(stderr, "Could not write refcount block: %s\n", strerror(-ret)); - goto fail; + goto fail_free_cluster; } /* update refcount table */ @@ -1436,24 +1435,27 @@ static int64_t realloc_refcount_block(BlockDriverState *bs, int reftable_index, if (ret < 0) { fprintf(stderr, "Could not update refcount table: %s\n", strerror(-ret)); - goto fail; + goto fail_free_cluster; } -fail: - if (new_offset && (ret < 0)) { - qcow2_free_clusters(bs, new_offset, s->cluster_size, - QCOW2_DISCARD_ALWAYS); - } + goto done; + +fail_free_cluster: + qcow2_free_clusters(bs, new_offset, s->cluster_size, QCOW2_DISCARD_OTHER); + +done: if (refcount_block) { - if (ret < 0) { - qcow2_cache_put(bs, s->refcount_block_cache, &refcount_block); - } else { - ret = qcow2_cache_put(bs, s->refcount_block_cache, &refcount_block); - } + /* This should never fail, as it would only do so if the given refcount + * block cannot be found in the cache. As this is impossible as long as + * there are no bugs, assert the success. */ + int tmp = qcow2_cache_put(bs, s->refcount_block_cache, &refcount_block); + assert(tmp == 0); } + if (ret < 0) { return ret; } + return new_offset; } |