linux-kernel - Re: [PATCH] vfs - fix automount should ignore LOOKUP

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Date:	Sun, 23 Oct 2011 06:41:48 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	Ian Kent <raven@...maw.net>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	David Howells <dhowells@...hat.com>
Subject: Re: [PATCH] vfs - fix automount should ignore LOOKUP_FOLLOW

On Sat, Oct 22, 2011 at 10:01 AM, Ian Kent <raven@...maw.net> wrote:
> The recent patch by Miklos Szeredi that was meant to restore the original
> behavior of not triggering automounts on stat(2) and other symlink following
> syscalls also eliminated the unconditional triggering of automounts for
> intermediate path components by eliminating the LOOKUP_CONTUNUE flag from
> the check in fs/namei.c:follow_automount().
>
> This introduces a regression itself because it alters the original behaviour
> which was to unconditionally automount on intermediate path components.

LOOKUP_CONTINUE flag no longer exists (commit 49084c3 "kill LOOKUP_CONTINUE")

So this patch makes no sense for HEAD, it may make sense for backports.

Miklos

>
> Signed-off-by: Ian Kent <raven@...maw.net>
> ---
>
>  fs/namei.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/fs/namei.c b/fs/namei.c
> index 0b3138d..e4eee7c 100644
> --- a/fs/namei.c
> +++ b/fs/namei.c
> @@ -732,7 +732,7 @@ static int follow_automount(struct path *path, unsigned flags,
>         * as being automount points.  These will need the attentions
>         * of the daemon to instantiate them before they can be used.
>         */
> -       if (!(flags & (LOOKUP_PARENT | LOOKUP_DIRECTORY |
> +       if (!(flags & (LOOKUP_PARENT | LOOKUP_CONTINUE | LOOKUP_DIRECTORY |
>                     LOOKUP_OPEN | LOOKUP_CREATE | LOOKUP_AUTOMOUNT)) &&
>            path->dentry->d_inode)
>                return -EISDIR;
>
>
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