linux-kernel - Re: [PATCH 1/1] Btrfs: fix sparse warning

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Date:	Thu, 17 Jul 2014 20:37:34 +0200 (CEST)
From:	Fabian Frederick <fabf@...net.be>
To:	Zach Brown <zab@...bo.net>
Cc:	Josef Bacik <jbacik@...com>, linux-kernel@...r.kernel.org,
	linux-btrfs@...r.kernel.org, Chris Mason <clm@...com>
Subject: Re: [PATCH 1/1] Btrfs: fix sparse warning



> On 16 July 2014 at 19:20 Zach Brown <zab@...bo.net> wrote:
>
>
> On Tue, Jul 15, 2014 at 09:17:17PM +0200, Fabian Frederick wrote:
> > Fix the following sparse warning:
> > fs/btrfs/send.c:518:51: warning: incorrect type in argument 2 (different
> > address spaces)
> > fs/btrfs/send.c:518:51:    expected char const [noderef] *
> > fs/btrfs/send.c:518:51:    got char *
> >
> > We can safely use (const char __user *) with set_fs(KERNEL_DS)
>
> Yeah, that cast is correct.
>
> Reviewed-by: Zach Brown <zab@...bo.net>
>
> > @@ -515,7 +515,8 @@ static int write_buf(struct file *filp, const void *buf,
> > u32 len, loff_t *off)
>
> Though this probably wants to be rewritten in terms of kernel_write().
> That'd give an opportunity to get rid of the sctx->send_off and have it
> use f_pos in the filp.

Do you mean directly call kernel_write from send_cmd/send_header ?
I guess that loop around vfs_write in write_buf is there for something ...

Fabian

>
> - z
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