From: Chris Mason Date: Tue, 1 Apr 2008 15:26:07 +0000 (-0400) Subject: Btrfs: Keep fs_mutex during reads done by snapshot deletion X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=ecbe2402cb4e4e7413544dc392c1a78d0f290292;p=openwrt%2Fstaging%2Fblogic.git Btrfs: Keep fs_mutex during reads done by snapshot deletion There was an optimization to drop the fs_mutex when doing snapshot deletion reads, but this can lead to false positives on checksumming errors. Keep the lock for now. Signed-off-by: Chris Mason --- diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index c226656f29b7..cf283b0271ac 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -2046,11 +2046,12 @@ static int noinline walk_down_tree(struct btrfs_trans_handle *trans, if (!next || !btrfs_buffer_uptodate(next)) { free_extent_buffer(next); reada_walk_down(root, cur, path->slots[*level]); - mutex_unlock(&root->fs_info->fs_mutex); next = read_tree_block(root, bytenr, blocksize); - mutex_lock(&root->fs_info->fs_mutex); - /* we dropped the lock, check one more time */ + /* we used to drop the lock above, keep the + * code to double check so that we won't forget + * when we drop the lock again in the future + */ ret = lookup_extent_ref(trans, root, bytenr, blocksize, &refs); BUG_ON(ret);