linux-kernel - Re: [PATCH -v6 2/2] Updating ctime and mtime for memory-mapped files

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Date:	Sat, 19 Jan 2008 09:49:57 -0600
From:	Matt Mackall <mpm@...enic.com>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	riel@...hat.com, torvalds@...ux-foundation.org,
	ioe-lkml@...eria.de, peterz@...radead.org, salikhmetov@...il.com,
	linux-mm@...ck.org, jakob@...hought.net,
	linux-kernel@...r.kernel.org, valdis.kletnieks@...edu, ksm@...dk,
	staubach@...hat.com, jesper.juhl@...il.com,
	akpm@...ux-foundation.org, protasnb@...il.com,
	r.e.wolff@...wizard.nl, hidave.darkstar@...il.com,
	hch@...radead.org
Subject: Re: [PATCH -v6 2/2] Updating ctime and mtime for memory-mapped
	files


On Sat, 2008-01-19 at 11:22 +0100, Miklos Szeredi wrote:
> > Reminds me, I've got a patch here for addressing that problem with loop mounts:
> > 
> > Writes to loop should update the mtime of the underlying file.
> > 
> > Signed-off-by: Matt Mackall <mpm@...enic.com>
> > 
> > Index: l/drivers/block/loop.c
> > ===================================================================
> > --- l.orig/drivers/block/loop.c	2007-11-05 17:50:07.000000000 -0600
> > +++ l/drivers/block/loop.c	2007-11-05 19:03:51.000000000 -0600
> > @@ -221,6 +221,7 @@ static int do_lo_send_aops(struct loop_d
> >  	offset = pos & ((pgoff_t)PAGE_CACHE_SIZE - 1);
> >  	bv_offs = bvec->bv_offset;
> >  	len = bvec->bv_len;
> > +	file_update_time(file);
> >  	while (len > 0) {
> >  		sector_t IV;
> >  		unsigned size;
> > @@ -299,6 +300,7 @@ static int __do_lo_send_write(struct fil
> >  
> >  	set_fs(get_ds());
> >  	bw = file->f_op->write(file, buf, len, &pos);
> > +	file_update_time(file);
> 
> ->write should have already updated the times, no?

Yes, this second case is redundant. Still needed in the first case.

-- 
Mathematics is the supreme nostalgia of our time.

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