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Date:	Sun, 30 May 2010 22:49:19 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	stable@...nel.org
Cc:	Ext4 Developers List <linux-ext4@...r.kernel.org>,
	Richard Kennedy <richard@....demon.co.uk>,
	"Theodore Ts'o" <tytso@....edu>
Subject: [PATCH v2.6.32.y 06/53] ext4: return correct wbc.nr_to_write in ext4_da_writepages

From: Richard Kennedy <richard@....demon.co.uk>

commit 2faf2e19dd0e060eeb32442858ef495ac3083277 upstream (as of v2.6.33-rc3)

When ext4_da_writepages increases the nr_to_write in writeback_control
then it must always re-base the return value.  Originally there was a
(misguided) attempt prevent wbc.nr_to_write from going negative.  In
fact, it's necessary to allow nr_to_write to be negative so that
wb_writeback() can correctly calculate how many pages were actually
written.

Signed-off-by: Richard Kennedy <richard@....demon.co.uk>
Signed-off-by: "Theodore Ts'o" <tytso@....edu>
---
 fs/ext4/inode.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 9b81b76..89f4362 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3010,8 +3010,7 @@ retry:
 out_writepages:
 	if (!no_nrwrite_index_update)
 		wbc->no_nrwrite_index_update = 0;
-	if (wbc->nr_to_write > nr_to_writebump)
-		wbc->nr_to_write -= nr_to_writebump;
+	wbc->nr_to_write -= nr_to_writebump;
 	wbc->range_start = range_start;
 	trace_ext4_da_writepages_result(inode, wbc, ret, pages_written);
 	return ret;
-- 
1.6.6.1.1.g974db.dirty

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