diff options
Diffstat (limited to 'block/qcow2-cluster.c')
| -rw-r--r-- | block/qcow2-cluster.c | 18 |
1 files changed, 13 insertions, 5 deletions
diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c index 4b3345b11b..d7e0e19d9c 100644 --- a/block/qcow2-cluster.c +++ b/block/qcow2-cluster.c @@ -471,6 +471,8 @@ int qcow2_get_cluster_offset(BlockDriverState *bs, uint64_t offset, QCOW_OFLAG_COMPRESSED | QCOW_OFLAG_ZERO); *cluster_offset &= L2E_OFFSET_MASK; break; + default: + abort(); } qcow2_cache_put(bs, s->l2_table_cache, (void**) &l2_table); @@ -538,7 +540,6 @@ static int get_cluster_table(BlockDriverState *bs, uint64_t offset, if (l2_offset) { qcow2_free_clusters(bs, l2_offset, s->l2_size * sizeof(uint64_t)); } - l2_offset = s->l1_table[l1_index] & L1E_OFFSET_MASK; } /* find the cluster offset for the given disk offset */ @@ -641,11 +642,10 @@ int qcow2_alloc_cluster_link_l2(BlockDriverState *bs, QCowL2Meta *m) } if (m->nb_available & (s->cluster_sectors - 1)) { - uint64_t end = m->nb_available & ~(uint64_t)(s->cluster_sectors - 1); cow = true; qemu_co_mutex_unlock(&s->lock); - ret = copy_sectors(bs, start_sect + end, cluster_offset + (end << 9), - m->nb_available - end, s->cluster_sectors); + ret = copy_sectors(bs, start_sect, cluster_offset, m->nb_available, + align_offset(m->nb_available, s->cluster_sectors)); qemu_co_mutex_lock(&s->lock); if (ret < 0) goto err; @@ -947,8 +947,16 @@ again: /* save info needed for meta data update */ if (nb_clusters > 0) { + /* + * requested_sectors: Number of sectors from the start of the first + * newly allocated cluster to the end of the (possibly shortened + * before) write request. + * + * avail_sectors: Number of sectors from the start of the first + * newly allocated to the end of the last newly allocated cluster. + */ int requested_sectors = n_end - keep_clusters * s->cluster_sectors; - int avail_sectors = (keep_clusters + nb_clusters) + int avail_sectors = nb_clusters << (s->cluster_bits - BDRV_SECTOR_BITS); *m = (QCowL2Meta) { |