From: Liu Bo <liubo2009@cn.fujitsu.com>
Date: Thu, 29 Mar 2012 13:57:45 +0000 (-0400)
Subject: Btrfs: update to the right index of defragment
X-Git-Tag: v3.4-rc1~22^2~1
X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=e1f041e14cfb322f41f41a308bfede00f1b080cd;p=~emulex%2Finfiniband.git

Btrfs: update to the right index of defragment

When we use autodefrag, we forget to update the index which indicates
the last page we've dirty.  And we'll set dirty flags on a same set of
pages again and again.

Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
---

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index afde837644e..18cc23d164a 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -1186,6 +1186,9 @@ int btrfs_defrag_file(struct inode *inode, struct file *file,
 			if (newer_off == (u64)-1)
 				break;
 
+			if (ret > 0)
+				i += ret;
+
 			newer_off = max(newer_off + 1,
 					(u64)i << PAGE_CACHE_SHIFT);