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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>
This commit is contained in:
David Sterba 2019-03-27 16:19:55 +01:00
parent d23ea3fa7d
commit 73e82fe409
1 changed files with 2 additions and 2 deletions
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4
fs/btrfs/ctree.c
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@ -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;