linux-kernel - Re: [PATCH 10/11] nfs: Push file_update_time() into nfs_vm_page

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Date:	Thu, 16 Feb 2012 13:50:19 +0000
From:	"Myklebust, Trond" <Trond.Myklebust@...app.com>
To:	Jan Kara <jack@...e.cz>
CC:	LKML <linux-kernel@...r.kernel.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Eric Sandeen <sandeen@...hat.com>,
	Dave Chinner <david@...morbit.com>,
	"linux-nfs@...r.kernel.org" <linux-nfs@...r.kernel.org>
Subject: Re: [PATCH 10/11] nfs: Push file_update_time() into
 nfs_vm_page_mkwrite()

On Thu, 2012-02-16 at 14:46 +0100, Jan Kara wrote:
> CC: Trond Myklebust <Trond.Myklebust@...app.com>
> CC: linux-nfs@...r.kernel.org
> Signed-off-by: Jan Kara <jack@...e.cz>
> ---
>  fs/nfs/file.c |    3 +++
>  1 files changed, 3 insertions(+), 0 deletions(-)
> 
> diff --git a/fs/nfs/file.c b/fs/nfs/file.c
> index c43a452..2407922 100644
> --- a/fs/nfs/file.c
> +++ b/fs/nfs/file.c
> @@ -525,6 +525,9 @@ static int nfs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
>  	/* make sure the cache has finished storing the page */
>  	nfs_fscache_wait_on_page_write(NFS_I(dentry->d_inode), page);
>  
> +	/* Update file times before taking page lock */
> +	file_update_time(filp);
> +
>  	lock_page(page);
>  	mapping = page->mapping;
>  	if (mapping != dentry->d_inode->i_mapping)

Hi Jan,

file_update_time() is a no-op in NFS, since we set S_NOATIME|S_NOCMTIME
on all inodes.

Cheers
  Trond

-- 
Trond Myklebust
Linux NFS client maintainer

NetApp
Trond.Myklebust@...app.com
www.netapp.com