linux-kernel - [PATCH 6/6] ubifs: Wait for page writeback to provide stable pages

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Message-ID: <20130115054320.1563.54829.stgit@blackbox.djwong.org>
Date:	Mon, 14 Jan 2013 21:43:20 -0800
From:	"Darrick J. Wong" <darrick.wong@...cle.com>
To:	axboe@...nel.dk, lucho@...kov.net, jack@...e.cz,
	darrick.wong@...cle.com, ericvh@...il.com, tytso@....edu,
	viro@...iv.linux.org.uk, rminnich@...dia.gov
Cc:	martin.petersen@...cle.com, Artem Bityutskiy <dedekind1@...il.com>,
	neilb@...e.de, Adrian Hunter <adrian.hunter@...el.com>,
	david@...morbit.com, gnehzuil.liu@...il.com,
	linux-kernel@...r.kernel.org, hch@...radead.org,
	linux-fsdevel@...r.kernel.org, adilger.kernel@...ger.ca,
	bharrosh@...asas.com, jlayton@...ba.org,
	linux-mtd@...ts.infradead.org, linux-ext4@...r.kernel.org,
	hirofumi@...l.parknet.co.jp
Subject: [PATCH 6/6] ubifs: 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
ubifs_vm_page_mkwrite().

CC: Artem Bityutskiy <dedekind1@...il.com>
From: Jan Kara <jack@...e.cz>
CC: Adrian Hunter <adrian.hunter@...el.com>
CC: linux-mtd@...ts.infradead.org
Signed-off-by: Jan Kara <jack@...e.cz>
---
 fs/ubifs/file.c |    1 +
 1 file changed, 1 insertion(+)


diff --git a/fs/ubifs/file.c b/fs/ubifs/file.c
index 5bc7781..4f6493c 100644
--- a/fs/ubifs/file.c
+++ b/fs/ubifs/file.c
@@ -1522,6 +1522,7 @@ static int ubifs_vm_page_mkwrite(struct vm_area_struct *vma,
 			ubifs_release_dirty_inode_budget(c, ui);
 	}
 
+	wait_for_stable_page(page);
 	unlock_page(page);
 	return 0;
 

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