diff options
Diffstat (limited to 'fs/btrfs/extent-tree.c')
| -rw-r--r-- | fs/btrfs/extent-tree.c | 24 |
1 files changed, 20 insertions, 4 deletions
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 94dffe6b6252..23a7cac108eb 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -164,9 +164,16 @@ search_again: ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item); num_refs = btrfs_extent_refs(leaf, ei); + if (unlikely(num_refs == 0)) { + ret = -EUCLEAN; + btrfs_err(fs_info, + "unexpected zero reference count for extent item (%llu %u %llu)", + key.objectid, key.type, key.offset); + btrfs_abort_transaction(trans, ret); + goto out_free; + } extent_flags = btrfs_extent_flags(leaf, ei); owner = btrfs_get_extent_owner_root(fs_info, leaf, path->slots[0]); - BUG_ON(num_refs == 0); } else { num_refs = 0; extent_flags = 0; @@ -193,10 +200,19 @@ search_again: goto search_again; } spin_lock(&head->lock); - if (head->extent_op && head->extent_op->update_flags) + if (head->extent_op && head->extent_op->update_flags) { extent_flags |= head->extent_op->flags_to_set; - else - BUG_ON(num_refs == 0); + } else if (unlikely(num_refs == 0)) { + spin_unlock(&head->lock); + mutex_unlock(&head->mutex); + spin_unlock(&delayed_refs->lock); + ret = -EUCLEAN; + btrfs_err(fs_info, + "unexpected zero reference count for extent %llu (%s)", + bytenr, metadata ? "metadata" : "data"); + btrfs_abort_transaction(trans, ret); + goto out_free; + } num_refs += head->ref_mod; spin_unlock(&head->lock); |