From: Filipe David Borba Manana <fdmanana@gmail.com>
Date: Mon, 14 Oct 2013 21:49:11 +0000 (+0100)
Subject: Btrfs: optimize tree-log.c:count_inode_refs()
X-Git-Tag: v4.14-rc1~8407^2~71
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=e93ae26fe1123e9077e79cc7af8a0d42adf4812f;p=platform%2Fkernel%2Flinux-rpi.git

Btrfs: optimize tree-log.c:count_inode_refs()

Avoid repeated tree searches by processing all inode ref items in
a leaf at once instead of processing one at a time, followed by a
path release and a tree search for a key with a decremented offset.

Signed-off-by: Filipe David Borba Manana <fdmanana@gmail.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
---

diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index d12696d..d45c04b 100644
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -1312,6 +1312,7 @@ static int count_inode_refs(struct btrfs_root *root,
 				break;
 			path->slots[0]--;
 		}
+process_slot:
 		btrfs_item_key_to_cpu(path->nodes[0], &key,
 				      path->slots[0]);
 		if (key.objectid != ino ||
@@ -1332,6 +1333,10 @@ static int count_inode_refs(struct btrfs_root *root,
 
 		if (key.offset == 0)
 			break;
+		if (path->slots[0] > 0) {
+			path->slots[0]--;
+			goto process_slot;
+		}
 		key.offset--;
 		btrfs_release_path(path);
 	}