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

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Date:	Tue, 10 May 2011 14:41:03 +0200
From:	Jan Kara <jack@...e.cz>
To:	"Darrick J. Wong" <djwong@...ibm.com>
Cc:	Theodore Tso <tytso@....edu>, Jan Kara <jack@...e.cz>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
	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: Re: [PATCH 2/7] fs: block_page_mkwrite should wait for writeback
 to finish

On Mon 09-05-11 16:03:34, Darrick J. Wong wrote:
> 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);
  Not that it matters much but it would seem more logical to me if we
waited only in not-error case (i.e. after the error handling below).

								Honza
>  	if (unlikely(ret)) {
>  		unlock_page(page);
>  		if (ret == -ENOMEM)
> 
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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