From: Jan Kara <jack@suse.cz>
Date: Wed, 20 Feb 2013 02:15:08 +0000 (+1100)
Subject: ocfs2: wait for page writeback to provide stable pages
X-Git-Tag: next-20130220~1^2~372
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=5464c6c722ac8931c5dd704c93aa92c5fd0056be;p=karo-tx-linux.git

ocfs2: wait for page writeback to provide stable pages

When stable pages are required, we have to wait if the page is just going
to disk and we want to modify it.  Add proper callback to
ocfs2_grab_pages_for_write().

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Acked-by: Joel Becker <jlbec@evilplan.org>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Artem Bityutskiy <dedekind1@gmail.com>
Cc: Steven Whitehouse <swhiteho@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Eric Van Hensbergen <ericvh@gmail.com>
Cc: Ron Minnich <rminnich@sandia.gov>
Cc: Latchesar Ionkov <lucho@ionkov.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index 657743254eb9..9796330d8f04 100644
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -1194,6 +1194,7 @@ static int ocfs2_grab_pages_for_write(struct address_space *mapping,
 				goto out;
 			}
 		}
+		wait_for_stable_page(wc->w_pages[i]);
 
 		if (index == target_index)
 			wc->w_target_page = wc->w_pages[i];