From: David Sterba <dsterba@suse.com>
Date: Wed, 27 Mar 2019 15:19:55 +0000 (+0100)
Subject: btrfs: assert extent map tree lock in add_extent_mapping
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=d23ea3fa7dcb0d4a2c405de0879bc4ddcf521d7d;p=openwrt%2Fstaging%2Fblogic.git

btrfs: assert extent map tree lock in add_extent_mapping

As add_extent_mapping is called from several functions, let's add the
lock annotation. The tree is going to be modified so it must be the
exclusive lock.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
---

diff --git a/fs/btrfs/extent_map.c b/fs/btrfs/extent_map.c
index 9558d79faf1e..9d30acca55e1 100644
--- a/fs/btrfs/extent_map.c
+++ b/fs/btrfs/extent_map.c
@@ -384,6 +384,8 @@ int add_extent_mapping(struct extent_map_tree *tree,
 {
 	int ret = 0;
 
+	lockdep_assert_held_write(&tree->lock);
+
 	ret = tree_insert(&tree->map, em);
 	if (ret)
 		goto out;