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

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Message-ID: <20110527192341.32105.95751.stgit@elm3c44.beaverton.ibm.com>
Date:	Fri, 27 May 2011 12:23:41 -0700
From:	"Darrick J. Wong" <djwong@...ibm.com>
To:	Christoph Hellwig <hch@...radead.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	"Darrick J. Wong" <djwong@...ibm.com>
Cc:	Jens Axboe <axboe@...nel.dk>, Theodore Tso <tytso@....edu>,
	"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>, 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>,
	Jan Kara <jack@...e.cz>, linux-ext4@...r.kernel.org,
	Mingming Cao <mcao@...ibm.com>
Subject: [PATCH 2/2] 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 698c6b2..49c9aad 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -2382,6 +2382,7 @@ int __block_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf,
 		ret = -EAGAIN;
 		goto out_unlock;
 	}
+	wait_on_page_writeback(page);
 	return 0;
 out_unlock:
 	unlock_page(page);

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