diff options
Diffstat (limited to 'block')
| -rw-r--r-- | block/qcow2-cluster.c | 38 |
1 files changed, 22 insertions, 16 deletions
diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c index ea98afc..03a9f25 100644 --- a/block/qcow2-cluster.c +++ b/block/qcow2-cluster.c @@ -157,31 +157,36 @@ static uint64_t *seek_l2_table(BDRVQcowState *s, uint64_t l2_offset) * the image file failed. */ -static uint64_t *l2_load(BlockDriverState *bs, uint64_t l2_offset) +static int l2_load(BlockDriverState *bs, uint64_t l2_offset, + uint64_t **l2_table) { BDRVQcowState *s = bs->opaque; int min_index; - uint64_t *l2_table; + int ret; /* seek if the table for the given offset is in the cache */ - l2_table = seek_l2_table(s, l2_offset); - if (l2_table != NULL) - return l2_table; + *l2_table = seek_l2_table(s, l2_offset); + if (*l2_table != NULL) { + return 0; + } /* not found: load a new entry in the least used one */ min_index = l2_cache_new_entry(bs); - l2_table = s->l2_cache + (min_index << s->l2_bits); + *l2_table = s->l2_cache + (min_index << s->l2_bits); BLKDBG_EVENT(bs->file, BLKDBG_L2_LOAD); - if (bdrv_pread(bs->file, l2_offset, l2_table, s->l2_size * sizeof(uint64_t)) != - s->l2_size * sizeof(uint64_t)) - return NULL; + ret = bdrv_pread(bs->file, l2_offset, *l2_table, + s->l2_size * sizeof(uint64_t)); + if (ret < 0) { + return ret; + } + s->l2_cache_offsets[min_index] = l2_offset; s->l2_cache_counts[min_index] = 1; - return l2_table; + return 0; } /* @@ -440,6 +445,7 @@ int qcow2_get_cluster_offset(BlockDriverState *bs, uint64_t offset, int l1_bits, c; unsigned int index_in_cluster, nb_clusters; uint64_t nb_available, nb_needed; + int ret; index_in_cluster = (offset >> 9) & (s->cluster_sectors - 1); nb_needed = *num + index_in_cluster; @@ -478,9 +484,9 @@ int qcow2_get_cluster_offset(BlockDriverState *bs, uint64_t offset, /* load the l2 table in memory */ l2_offset &= ~QCOW_OFLAG_COPIED; - l2_table = l2_load(bs, l2_offset); - if (l2_table == NULL) { - return -EIO; + ret = l2_load(bs, l2_offset, &l2_table); + if (ret < 0) { + return ret; } /* find the cluster offset for the given disk offset */ @@ -547,9 +553,9 @@ static int get_cluster_table(BlockDriverState *bs, uint64_t offset, if (l2_offset & QCOW_OFLAG_COPIED) { /* load the l2 table in memory */ l2_offset &= ~QCOW_OFLAG_COPIED; - l2_table = l2_load(bs, l2_offset); - if (l2_table == NULL) { - return -EIO; + ret = l2_load(bs, l2_offset, &l2_table); + if (ret < 0) { + return ret; } } else { if (l2_offset) |