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Date: Thu, 22 Jan 2009 22:14:47 -0800
From: Greg KH <gregkh@suse.de>
To: linux-kernel@vger.kernel.org, stable@kernel.org
Cc: Justin Forbes <jmforbes@linuxtx.org>,
       Zwane Mwaikambo <zwane@arm.linux.org.uk>,
       "Theodore Ts'o" <tytso@mit.edu>, Randy Dunlap <rdunlap@xenotime.net>,
       Dave Jones <davej@redhat.com>, Chuck Wolber <chuckw@quantumlinux.com>,
       Chris Wedgwood <reviews@ml.cw.f00f.org>,
       Michael Krufky <mkrufky@linuxtv.org>, Chuck Ebbert <cebbert@redhat.com>,
       Domenico Andreoli <cavokz@gmail.com>, Willy Tarreau <w@1wt.eu>,
       Rodrigo Rubira Branco <rbranco@la.checkpoint.com>,
       Jake Edge <jake@lwn.net>, Eugene Teo <eteo@redhat.com>,
       torvalds@linux-foundation.org, akpm@linux-foundation.org,
       alan@lxorguk.ukuu.org.uk, Nick Piggin <npiggin@suse.de>,
       Chris Mason <chris.mason@oracle.com>,
       Dave Chinner <david@fromorbit.com>
Subject: [patch 35/40] mm: write_cache_pages more terminate quickly
Message-ID: <20090123061447.GI2922@kroah.com>
References: <20090123001330.046404396@mini.kroah.org>
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2.6.27-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Andrew Morton <akpm@linux-foundation.org>

commit 82fd1a9a8ced9607312b54859572bcc6211e8919 upstream.

Now that we have the early-termination logic in place, it makes sense to
bail out early in all other cases where done is set to 1.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Dave Chinner <david@fromorbit.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 mm/page-writeback.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -987,12 +987,15 @@ continue_unlock:
 
 			if (wbc->sync_mode == WB_SYNC_NONE) {
 				wbc->nr_to_write--;
-				if (wbc->nr_to_write <= 0)
+				if (wbc->nr_to_write <= 0) {
 					done = 1;
+					break;
+				}
 			}
 			if (wbc->nonblocking && bdi_write_congested(bdi)) {
 				wbc->encountered_congestion = 1;
 				done = 1;
+				break;
 			}
 		}
 		pagevec_release(&pvec);