From: Nathan Scott <nathans@sgi.com>
Date: Fri, 24 Mar 2006 03:46:22 +0000 (+1100)
Subject: [PATCH] XFS writeout fix
X-Git-Tag: v2.6.16.1~12
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9620554ca94a95059466e7e9cd6298bf78a09a09;p=people%2Fms%2Flinux.git

[PATCH] XFS writeout fix

[XFS] Check that a page has dirty buffers before finding it acceptable for
rewrite clustering.  This prevents writing excessive amounts of clean data
when doing random rewrites of a cached file.

Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Nathan Scott <nathans@sgi.com>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/fs/xfs/linux-2.6/xfs_aops.c b/fs/xfs/linux-2.6/xfs_aops.c
index 74d8be87f983..a98073629b48 100644
--- a/fs/xfs/linux-2.6/xfs_aops.c
+++ b/fs/xfs/linux-2.6/xfs_aops.c
@@ -616,7 +616,7 @@ xfs_is_delayed_page(
 				acceptable = (type == IOMAP_UNWRITTEN);
 			else if (buffer_delay(bh))
 				acceptable = (type == IOMAP_DELAY);
-			else if (buffer_mapped(bh))
+			else if (buffer_dirty(bh) && buffer_mapped(bh))
 				acceptable = (type == 0);
 			else
 				break;