From: Nikolay Borisov Date: Mon, 21 Aug 2017 09:43:49 +0000 (+0300) Subject: btrfs: Rework error handling of add_extent_mapping in __btrfs_alloc_chunk X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=1efb72a3c3ea8e430d1984774692ecbe3235600a;p=openwrt%2Fstaging%2Fblogic.git btrfs: Rework error handling of add_extent_mapping in __btrfs_alloc_chunk Currently the code executes add_extent_mapping and if it is successful it links the new mapping, it then proceeds to unlock the extent mapping tree and check for failure and handle them. Instead, rework the code to only perform a single check if add_extent_mapping has failed and handle it, otherwise the code continues in a linear fashion. No functional changes Signed-off-by: Nikolay Borisov Reviewed-by: Josef Bacik Reviewed-by: David Sterba Signed-off-by: David Sterba --- diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 533b417d9342..ac1e8686ba78 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -4808,16 +4808,16 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans, em_tree = &info->mapping_tree.map_tree; write_lock(&em_tree->lock); ret = add_extent_mapping(em_tree, em, 0); - if (!ret) { - list_add_tail(&em->list, &trans->transaction->pending_chunks); - refcount_inc(&em->refs); - } - write_unlock(&em_tree->lock); if (ret) { + write_unlock(&em_tree->lock); free_extent_map(em); goto error; } + list_add_tail(&em->list, &trans->transaction->pending_chunks); + refcount_inc(&em->refs); + write_unlock(&em_tree->lock); + ret = btrfs_make_block_group(trans, info, 0, type, start, num_bytes); if (ret) goto error_del_extent;