diff options
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/btrfs/ctree.c | 27 |
1 files changed, 16 insertions, 11 deletions
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c index 44dd1950f88a..239682330929 100644 --- a/fs/btrfs/ctree.c +++ b/fs/btrfs/ctree.c @@ -2632,19 +2632,24 @@ static struct extent_buffer *btrfs_search_slot_get_root(struct btrfs_root *root, } /* - * We don't know the level of the root node until we actually have it - * read locked + * If the level is set to maximum, we can skip trying to get the read + * lock. */ - b = btrfs_read_lock_root_node(root); - level = btrfs_header_level(b); - if (level > write_lock_level) - goto out; + if (write_lock_level < BTRFS_MAX_LEVEL) { + /* + * We don't know the level of the root node until we actually + * have it read locked + */ + b = btrfs_read_lock_root_node(root); + level = btrfs_header_level(b); + if (level > write_lock_level) + goto out; + + /* Whoops, must trade for write lock */ + btrfs_tree_read_unlock(b); + free_extent_buffer(b); + } - /* - * whoops, must trade for write lock - */ - btrfs_tree_read_unlock(b); - free_extent_buffer(b); b = btrfs_lock_root_node(root); root_lock = BTRFS_WRITE_LOCK; |