linux-ext4 - [PATCH 2/7] fs: block_page_mkwrite should wait for writeback to finish

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Date:	Mon, 09 May 2011 16:03:34 -0700
From:	"Darrick J. Wong" <djwong@...ibm.com>
To:	Theodore Tso <tytso@....edu>, Jan Kara <jack@...e.cz>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
	"Darrick J. Wong" <djwong@...ibm.com>
Cc:	Jens Axboe <axboe@...nel.dk>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Jeff Layton <jlayton@...hat.com>,
	Dave Chinner <david@...morbit.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Christoph Hellwig <hch@...radead.org>, linux-mm@...ck.org,
	Chris Mason <chris.mason@...cle.com>,
	Joel Becker <jlbec@...lplan.org>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	linux-ext4@...r.kernel.org, Mingming Cao <mcao@...ibm.com>
Subject: [PATCH 2/7] fs: block_page_mkwrite should wait for writeback to finish

For filesystems such as nilfs2 and xfs that use block_page_mkwrite, modify that
function to wait for pending writeback before allowing the page to become
writable.  This is needed to stabilize pages during writeback for those two
filesystems.

Signed-off-by: Darrick J. Wong <djwong@...ibm.com>
---
 fs/buffer.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)


diff --git a/fs/buffer.c b/fs/buffer.c
index a08bb8e..cf9a795 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -2361,6 +2361,7 @@ block_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf,
 	if (!ret)
 		ret = block_commit_write(page, 0, end);
 
+	wait_on_page_writeback(page);
 	if (unlikely(ret)) {
 		unlock_page(page);
 		if (ret == -ENOMEM)

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