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Commit 7a7965f8 authored by Yan, Zheng's avatar Yan, Zheng Committed by Chris Mason
Browse files

Btrfs: Fix oopsen when dropping empty tree. 



When dropping a empty tree, walk_down_tree() skips checking
extent information for the tree root. This will triggers a
BUG_ON in walk_up_proc().

Signed-off-by: default avatarYan Zheng <zheng.yan@oracle.com>
Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
parent d7ce5843

fs/btrfs/extent-tree.c

+4 −4
Original line number Diff line number Diff line
@@ -5402,10 +5402,6 @@ static noinline int walk_down_tree(struct btrfs_trans_handle *trans, 
	int ret;



	while (level >= 0) {

		if (path->slots[level] >=

		    btrfs_header_nritems(path->nodes[level]))

			break;



		ret = walk_down_proc(trans, root, path, wc, lookup_info);

		if (ret > 0)

			break;
@@ -5413,6 +5409,10 @@ static noinline int walk_down_tree(struct btrfs_trans_handle *trans, 
		if (level == 0)

			break;



		if (path->slots[level] >=

		    btrfs_header_nritems(path->nodes[level]))

			break;



		ret = do_walk_down(trans, root, path, wc, &lookup_info);

		if (ret > 0) {

			path->slots[level]++;