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

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Message-ID: <20120220223254.GC32708@quack.suse.cz>
Date:	Mon, 20 Feb 2012 23:32:54 +0100
From:	Jan Kara <jack@...e.cz>
To:	"Myklebust, Trond" <Trond.Myklebust@...app.com>
Cc:	Jan Kara <jack@...e.cz>, 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 16-02-12 13:50:19, Myklebust, Trond wrote:
> 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.
  Thanks. I've discarded the patch.

								Honza
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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