[patch 10/20] XFS writeout fix

[Greg KH]

-stable review patch.  If anyone has any objections, please let us know.

------------------
[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@xxxxxxx>
Signed-off-by: Nathan Scott <nathans@xxxxxxx>
Signed-off-by: Chris Wright <chrisw@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---

 fs/xfs/linux-2.6/xfs_aops.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-2.6.16.orig/fs/xfs/linux-2.6/xfs_aops.c
+++ linux-2.6.16/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;

--
-
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