linux-kernel - [PATCH 2/3] fs: block_page_mkwrite should wait for writeback to finish

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Message-ID: <20110519224855.28755.2720.stgit@elm3c44.beaverton.ibm.com>
Date:	Thu, 19 May 2011 15:48:55 -0700
From:	"Darrick J. Wong" <djwong@...ibm.com>
To:	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>,
	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>,
	Jan Kara <jack@...e.cz>, linux-ext4@...r.kernel.org,
	Mingming Cao <mcao@...ibm.com>
Subject: [PATCH 2/3] 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 |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)


diff --git a/fs/buffer.c b/fs/buffer.c
index a08bb8e..0e7fa16 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -2367,8 +2367,10 @@ block_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf,
 			ret = VM_FAULT_OOM;
 		else /* -ENOSPC, -EIO, etc */
 			ret = VM_FAULT_SIGBUS;
-	} else
+	} else {
+		wait_on_page_writeback(page);
 		ret = VM_FAULT_LOCKED;
+	}
 
 out:
 	return ret;

--
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