linux-kernel - Re: [PATCH] seq_file: make seq_lseek accept SEEK

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Date:	Mon, 09 Jun 2008 13:52:55 +0200
From:	Joakim Tjernlund <joakim.tjernlund@...nsmode.se>
To:	Alexey Dobriyan <adobriyan@...allels.com>
Cc:	akpm@...l.org, viro@....linux.org.uk, linux-kernel@...r.kernel.org,
	"busybox@...ybox.net" <busybox@...ybox.net>
Subject: Re: [PATCH] seq_file: make seq_lseek accept SEEK_END

busybox has been fixed, at least in trunk, not to do 
xlseek(fd, 0, SEEK_END) anymore to address this problem.
Perhaps there are other apps out there that needs this too, but I don't
know of any. Older busyboxes needs this change though.
I have moved on and don't have a setup handy where I can test this.
Perhaps someone at the bb list has, CC:ing bb list.

 Jocke

On Mon, 2008-06-09 at 15:01 +0400, Alexey Dobriyan wrote:
> Apologies for delay, such simple thing should have been sent long ago.
> Joakim, please, confirm.
> -------------------------------------------
> [PATCH] seq_file: make seq_lseek accept SEEK_END
> 
> and pretend seq_files have zero length. This should be enough
> to fix busybox start-stop-daemon:
> http://marc.info/?t=120836691600002&r=1&w=2
> 
> It does xlseek(fd, 0, SEEK_END) to estimate amount of memory to malloc
> but satisfied with 0. Sudden -EINVAL from lseek(2) breaks it.
> 
> X-Introduced-By: f16278c679aa72e28288435b313ba2d4494d6be5
> Signed-off-by: Alexey Dobriyan <adobriyan@...allels.com>
> ---
> 
>  fs/seq_file.c |    2 ++
>  1 file changed, 2 insertions(+)
> 
> --- a/fs/seq_file.c
> +++ b/fs/seq_file.c
> @@ -254,6 +254,8 @@ loff_t seq_lseek(struct file *file, loff_t offset, int origin)
>  	switch (origin) {
>  		case 1:
>  			offset += file->f_pos;
> +		case 2:
> +			/* pretend it's zero length */
>  		case 0:
>  			if (offset < 0)
>  				break;
> 
> 
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