linux-kernel - Re: [PATCH] autofs4-2.6.34-rc1

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Message-ID: <1273471487.2246.1.camel@localhost>
Date:	Mon, 10 May 2010 14:04:47 +0800
From:	Ian Kent <raven@...maw.net>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Al Viro <viro@...IV.linux.org.uk>
Subject: Re: [PATCH] autofs4-2.6.34-rc1 - fix link_count usage

On Mon, 2010-05-10 at 13:18 +0800, Ian Kent wrote:

Sorry, this isn't right, please ignore it.
Apart from the lack of a Signed-off-by: I hadn't tested against
the current kernel source when I posted.

> Following the commit below in 2.6.34-rc1 autofs direct mounts stop
> working. This is caused by current->link_count being 0 when
> ->follow_link() is called from do_filp_open().
> 
> I can't work out why this hasn't been seen before Als patch series.
> 
> This patch removes the autofs dependence on current->link_count.
> 
> 1f36f774b22a0ceb7dd33eca626746c81a97b6a5 is the first bad commit
> commit 1f36f774b22a0ceb7dd33eca626746c81a97b6a5
> Author: Al Viro <viro@...iv.linux.org.uk>
> Date:   Sat Dec 26 10:56:19 2009 -0500
> 
>     Switch !O_CREAT case to use of do_last()
> 
>     ... and now we have all intents crap well localized
> 
>     Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
> 
> :040000 040000 53c1effc5b22746bb83cdbc6a419bf898067882d 9606f7275fde188a056fd174aa1d622ac0630893 M	fs
> ---
> 
>  fs/autofs4/root.c |    5 ++---
>  1 files changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/fs/autofs4/root.c b/fs/autofs4/root.c
> index 109a6c6..a7e04ad 100644
> --- a/fs/autofs4/root.c
> +++ b/fs/autofs4/root.c
> @@ -177,8 +177,7 @@ static int try_to_fill_dentry(struct dentry *dentry, int flags)
>  		}
>  	/* Trigger mount for path component or follow link */
>  	} else if (ino->flags & AUTOFS_INF_PENDING ||
> -			autofs4_need_mount(flags) ||
> -			current->link_count) {
> +			autofs4_need_mount(flags)) {
>  		DPRINTK("waiting for mount name=%.*s",
>  			dentry->d_name.len, dentry->d_name.name);
>  
> @@ -262,7 +261,7 @@ static void *autofs4_follow_link(struct dentry *dentry, struct nameidata *nd)
>  		spin_unlock(&dcache_lock);
>  		spin_unlock(&sbi->fs_lock);
>  
> -		status = try_to_fill_dentry(dentry, 0);
> +		status = try_to_fill_dentry(dentry, lookup_type);
>  		if (status)
>  			goto out_error;
>  
> 
> --
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