btrfs: assert tree mod log lock in __tree_mod_log_insert
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/ctree.c b/fs/btrfs/ctree.c
index 5df76c1..9d1d0a9 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -376,8 +376,6 @@ void btrfs_put_tree_mod_seq(struct btrfs_fs_info *fs_info,
* The 'start address' is the logical address of the *new* root node
* for root replace operations, or the logical address of the affected
* block for all other operations.
- *
- * Note: must be called with write lock for fs_info::tree_mod_log_lock.
*/
static noinline int
__tree_mod_log_insert(struct btrfs_fs_info *fs_info, struct tree_mod_elem *tm)
@@ -387,6 +385,8 @@ __tree_mod_log_insert(struct btrfs_fs_info *fs_info, struct tree_mod_elem *tm)
struct rb_node *parent = NULL;
struct tree_mod_elem *cur;
+ lockdep_assert_held_write(&fs_info->tree_mod_log_lock);
+
tm->seq = btrfs_inc_tree_mod_seq(fs_info);
tm_root = &fs_info->tree_mod_log;