From 4d081c41a4f98aecb5e86ef7d3e644cc7b52131f Mon Sep 17 00:00:00 2001 From: Chris Mason Date: Wed, 4 Feb 2009 09:31:28 -0500 Subject: [PATCH] Btrfs: change btrfs_del_leaf to drop locks earlier btrfs_del_leaf does two things. First it removes the pointer in the parent, and then it frees the block that has the leaf. It has the parent node locked for both operations. But, it only needs the parent locked while it is deleting the pointer. After that it can safely free the block without the parent locked. Signed-off-by: Chris Mason --- fs/btrfs/ctree.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c index 3af777357acb..f6916ceb3920 100644 --- a/fs/btrfs/ctree.c +++ b/fs/btrfs/ctree.c @@ -3630,15 +3630,22 @@ noinline int btrfs_del_leaf(struct btrfs_trans_handle *trans, { int ret; u64 root_gen = btrfs_header_generation(path->nodes[1]); + u64 parent_start = path->nodes[1]->start; + u64 parent_owner = btrfs_header_owner(path->nodes[1]); ret = del_ptr(trans, root, path, 1, path->slots[1]); if (ret) return ret; + /* + * btrfs_free_extent is expensive, we want to make sure we + * aren't holding any locks when we call it + */ + btrfs_unlock_up_safe(path, 0); + ret = btrfs_free_extent(trans, root, bytenr, btrfs_level_size(root, 0), - path->nodes[1]->start, - btrfs_header_owner(path->nodes[1]), + parent_start, parent_owner, root_gen, 0, 1); return ret; }