linux-kernel - Re: [PATCH 1/3] splice: check f

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Date:	Wed, 26 May 2010 12:25:19 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	Changli Gao <xiaosuo@...il.com>
CC:	viro@...iv.linux.org.uk, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, xiaosuo@...il.com
Subject: Re: [PATCH 1/3] splice: check f_mode for seekable file

On Wed, 26 May 2010, Changli Gao wrote:
> check f_mode for seekable file
> 
> As a seekable file is allowed without a llseek function, so the old way isn't
> work any more.
> 
> Signed-off-by: Changli Gao <xiaosuo@...il.com>

Looks good.

Acked-by: Miklos Szeredi <mszeredi@...e.cz>

BTW, you should send splice patches to Jens Axboe, he's the maintainer
of the splice code.

Miklos

> ----
>  fs/splice.c |    6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> diff --git a/fs/splice.c b/fs/splice.c
> index 9313b61..9e52de5 100644
> --- a/fs/splice.c
> +++ b/fs/splice.c
> @@ -1321,8 +1321,7 @@ static long do_splice(struct file *in, loff_t __user *off_in,
>  		if (off_in)
>  			return -ESPIPE;
>  		if (off_out) {
> -			if (!out->f_op || !out->f_op->llseek ||
> -			    out->f_op->llseek == no_llseek)
> +			if (!(out->f_mode & FMODE_PWRITE))
>  				return -EINVAL;
>  			if (copy_from_user(&offset, off_out, sizeof(loff_t)))
>  				return -EFAULT;
> @@ -1342,8 +1341,7 @@ static long do_splice(struct file *in, loff_t __user *off_in,
>  		if (off_out)
>  			return -ESPIPE;
>  		if (off_in) {
> -			if (!in->f_op || !in->f_op->llseek ||
> -			    in->f_op->llseek == no_llseek)
> +			if (!(in->f_mode & FMODE_PREAD))
>  				return -EINVAL;
>  			if (copy_from_user(&offset, off_in, sizeof(loff_t)))
>  				return -EFAULT;
> --
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