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-Tag: v5.4-rc1~123^2~126
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=d23ea3fa7dcb0d4a2c405de0879bc4ddcf521d7d;p=thirdparty%2Fkernel%2Flinux.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 9558d79faf1e4..9d30acca55e17 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;