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

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Date:	Mon, 05 Sep 2011 17:37:39 +0100
From:	David Howells <dhowells@...hat.com>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	dhowells@...hat.com, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Leonardo Chiquitto <leonardo.lists@...il.com>,
	Ian Kent <raven@...maw.net>, Al Viro <viro@...iv.linux.org.uk>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	autofs@...ux.kernel.org
Subject: Re: [PATCH] vfs: automount should ignore LOOKUP_FOLLOW

Miklos Szeredi <miklos@...redi.hu> wrote:

> After 2.6.38, with the introduction of the ->d_automount()
> infrastructure, stat(2) and others would start triggering automount
> while lstat(2), etc. still would not.  This is a regression and a
> userspace ABI change.

It doesn't necessarily mean it's wrong.  The main class of program that needs
to be prevented from automounting are things that do bulk stat'ing (e.g. ls) -
and they should probably be doing lstat() anyway.

> +	/* We don't want to mount if someone's just doing a stat -
> +	 * unless they're stat'ing a directory and appended a '/' to
> +	 * the name.

Btw, line length is 80 chars.  This comment could easily use one fewer line.

If you use emacs you can do:

	ESC 7 9 C-x f

to set the right margin and then:

	M-q

whilst the cursor is in the comment paragraph to be rearranged and it will
'fill' the paragraph to 79 characters.

David
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