diff options
Diffstat (limited to 'block/qcow2-refcount.c')
| -rw-r--r-- | block/qcow2-refcount.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c index ca6b373..51948ae 100644 --- a/block/qcow2-refcount.c +++ b/block/qcow2-refcount.c @@ -228,7 +228,10 @@ static int64_t alloc_refcount_block(BlockDriverState *bs, int64_t cluster_index) } /* Allocate the refcount block itself and mark it as used */ - uint64_t new_block = alloc_clusters_noref(bs, s->cluster_size); + int64_t new_block = alloc_clusters_noref(bs, s->cluster_size); + if (new_block < 0) { + return new_block; + } #ifdef DEBUG_ALLOC2 fprintf(stderr, "qcow2: Allocate refcount block %d for %" PRIx64 @@ -579,14 +582,19 @@ static int update_cluster_refcount(BlockDriverState *bs, static int64_t alloc_clusters_noref(BlockDriverState *bs, int64_t size) { BDRVQcowState *s = bs->opaque; - int i, nb_clusters; + int i, nb_clusters, refcount; nb_clusters = size_to_clusters(s, size); retry: for(i = 0; i < nb_clusters; i++) { int64_t next_cluster_index = s->free_cluster_index++; - if (get_refcount(bs, next_cluster_index) != 0) + refcount = get_refcount(bs, next_cluster_index); + + if (refcount < 0) { + return refcount; + } else if (refcount != 0) { goto retry; + } } #ifdef DEBUG_ALLOC2 printf("alloc_clusters: size=%" PRId64 " -> %" PRId64 "\n", @@ -603,6 +611,10 @@ int64_t qcow2_alloc_clusters(BlockDriverState *bs, int64_t size) BLKDBG_EVENT(bs->file, BLKDBG_CLUSTER_ALLOC); offset = alloc_clusters_noref(bs, size); + if (offset < 0) { + return offset; + } + ret = update_refcount(bs, offset, size, 1); if (ret < 0) { return ret; |