linux-kernel - Re: [PATCH] tmpfs: ZERO_RANGE and COLLAPSE

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Date:	Tue, 17 Jun 2014 09:58:35 +0200 (CEST)
From:	Lukáš Czerner <lczerner@...hat.com>
To:	Hugh Dickins <hughd@...gle.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Namjae Jeon <namjae.jeon@...sung.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tmpfs: ZERO_RANGE and COLLAPSE_RANGE not currently
 supported

On Sun, 15 Jun 2014, Hugh Dickins wrote:

> Date: Sun, 15 Jun 2014 18:28:00 -0700 (PDT)
> From: Hugh Dickins <hughd@...gle.com>
> To: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Lukas Czerner <lczerner@...hat.com>,
>     Namjae Jeon <namjae.jeon@...sung.com>, linux-kernel@...r.kernel.org
> Subject: [PATCH] tmpfs: ZERO_RANGE and COLLAPSE_RANGE not currently supported
> 
> I was well aware of FALLOC_FL_ZERO_RANGE and FALLOC_FL_COLLAPSE_RANGE
> support being added to fallocate(); but didn't realize until now that
> I had been too stupid to future-proof shmem_fallocate() against new
> additions.  -EOPNOTSUPP instead of going on to ordinary fallocation.

Looks good.

Reviewed-by: Lukas Czerner <lczerner@...hat.com>

> 
> Signed-off-by: Hugh Dickins <hughd@...gle.com>
> Cc: stable@...r.kernel.org # v3.15
> ---
> 
>  mm/shmem.c |    3 +++
>  1 file changed, 3 insertions(+)
> 
> --- v3.15/mm/shmem.c	2014-06-08 11:19:54.000000000 -0700
> +++ linux/mm/shmem.c	2014-06-15 18:01:16.988996166 -0700
> @@ -1728,6 +1728,9 @@ static long shmem_fallocate(struct file
>  	pgoff_t start, index, end;
>  	int error;
>  
> +	if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
> +		return -EOPNOTSUPP;
> +
>  	mutex_lock(&inode->i_mutex);
>  
>  	if (mode & FALLOC_FL_PUNCH_HOLE) {
> 
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