From: "H. Peter Anvin" <hpa@zytor.com>
To: David Howells <dhowells@warthog.cambridge.redhat.com>
Cc: David Howells <dhowells@cambridge.redhat.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] VFS autmounter support
Date: Wed, 18 Jun 2003 10:16:33 -0700 [thread overview]
Message-ID: <3EF09E71.8020406@zytor.com> (raw)
In-Reply-To: <18943.1055925426@warthog.warthog>
David Howells wrote:
>>
>>That's actually not true. It's lstat() that mustn't cause the automount
>>point to mount -- stat() only comes into play if lstat() resolves to a
>>symlink. However, lstat() never invokes follow_link, so creating a
>>dentry with a follow_link method resolving to itself, and an associated
>>dummy directory inode, does what's required.
>
> That _is_ actually true. Doing "ls -l" in that directory would otherwise cause
> a mount storm.
>
It's not. ls -l and all the GUI tools do lstat(), not stat().
> follow_link resolving to itself? Surely that'll cause ELOOP very quickly? And
> where does this "dummy directory inode" live?
Nope. You can follow_link() nonrecursively. You need a dummy directory
inode to mount upon anyway.
-hpa
next prev parent reply other threads:[~2003-06-18 17:02 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-06-17 14:55 [PATCH] VFS autmounter support David Howells
2003-06-17 16:08 ` H. Peter Anvin
2003-06-17 18:07 ` David Howells
2003-06-17 18:19 ` H. Peter Anvin
2003-06-18 8:37 ` David Howells
2003-06-18 8:48 ` viro
2003-06-18 17:16 ` H. Peter Anvin [this message]
2003-06-19 7:20 ` David Howells
2003-06-19 7:30 ` H. Peter Anvin
2003-06-24 15:23 ` David Howells
2003-06-18 4:55 ` Linus Torvalds
2003-06-18 5:10 ` viro
2003-06-18 7:55 ` David Howells
2003-06-18 8:36 ` viro
2003-06-18 11:01 ` David Howells
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