Commit ffeb03cf authored by Josef Bacik's avatar Josef Bacik Committed by David Sterba
Browse files

btrfs: cleanup the locking in btrfs_next_old_leaf 



We are carrying around this next_rw_lock from when we would do spinning
vs blocking read locks.  Now that we have the rwsem locking we can
simply use the read lock flag unconditionally and the read lock helpers.

Reviewed-by: default avatarFilipe Manana <fdmanana@suse.com>
Signed-off-by: default avatarJosef Bacik <josef@toxicpanda.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent b2598edf

fs/btrfs/ctree.c

+4 −10
Original line number Diff line number Diff line
@@ -5272,7 +5272,6 @@ int btrfs_next_old_leaf(struct btrfs_root *root, struct btrfs_path *path, 
	struct btrfs_key key;

	u32 nritems;

	int ret;

	int next_rw_lock = 0;



	nritems = btrfs_header_nritems(path->nodes[0]);

	if (nritems == 0)
@@ -5282,7 +5281,6 @@ int btrfs_next_old_leaf(struct btrfs_root *root, struct btrfs_path *path, 
again:

	level = 1;

	next = NULL;

	next_rw_lock = 0;

	btrfs_release_path(path);



	path->keep_locks = 1;
@@ -5346,12 +5344,11 @@ again: 
		}



		if (next) {

			btrfs_tree_unlock_rw(next, next_rw_lock);

			btrfs_tree_read_unlock(next);

			free_extent_buffer(next);

		}



		next = c;

		next_rw_lock = path->locks[level];

		ret = read_block_for_search(root, path, &next, level,

					    slot, &key);

		if (ret == -EAGAIN)
@@ -5382,7 +5379,6 @@ again: 
						       BTRFS_NESTING_RIGHT,

						       path->recurse);

			}

			next_rw_lock = BTRFS_READ_LOCK;

		}

		break;

	}
@@ -5391,13 +5387,13 @@ again: 
		level--;

		c = path->nodes[level];

		if (path->locks[level])

			btrfs_tree_unlock_rw(c, path->locks[level]);

			btrfs_tree_read_unlock(c);



		free_extent_buffer(c);

		path->nodes[level] = next;

		path->slots[level] = 0;

		if (!path->skip_locking)

			path->locks[level] = next_rw_lock;

			path->locks[level] = BTRFS_READ_LOCK;

		if (!level)

			break;
@@ -5411,11 +5407,9 @@ again: 
			goto done;

		}



		if (!path->skip_locking) {

		if (!path->skip_locking)

			__btrfs_tree_read_lock(next, BTRFS_NESTING_RIGHT,

					       path->recurse);

			next_rw_lock = BTRFS_READ_LOCK;

		}

	}

	ret = 0;

done:

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