From: "H. Peter Anvin" <hpa@zytor.com>
To: Jim Carter <jimc@math.ucla.edu>
Cc: Mike Waychison <Michael.Waychison@sun.com>,
autofs mailing list <autofs@linux.kernel.org>,
Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [autofs] [RFC] Towards a Modern Autofs
Date: Thu, 08 Jan 2004 13:01:15 -0800 [thread overview]
Message-ID: <3FFDC51B.8070108@zytor.com> (raw)
In-Reply-To: <Pine.LNX.4.53.0401080911390.27090@simba.math.ucla.edu>
Jim Carter wrote:
>
>>For justification to it's worth, some institutions have file servers
>>that export hundreds or even thousands of shares over NFS. As /net is
>>really just a kind of executable indirect map that returns multimounts
>>for each hostname used as a key, just doing 'cd /net/hostname' may
>>potentially mount hundreds of filesystems. This is not cool!
>
> Definitely not cool. But some users (yours truly among them) do "alias ls
> 'ls -F'", which requires "ls" to stat (and thus mount) every exported
> filesystem. More uncool, and I don't see any non-disgusting way around it.
>
No, it doesn't... this has been covered several times already. It
requires ls to *lstat* the point; it only does a stat() if the resulting
entry is S_IFLNK. The same is true for GUI tools. There is a fairly
easy way to distinguish lstat() from virtually all other filesystem
calls -- it doesn't invoke follow_link. So the answer is simply to
create an inode which is S_IFDIR but has a follow_link method. The
follow_link method triggers a mount. This is called a "pseudo-symlink
directory" or sometimes "ghost directory".
-hpa
next prev parent reply other threads:[~2004-01-08 21:01 UTC|newest]
Thread overview: 115+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-01-06 19:55 [RFC] Towards a Modern Autofs Mike Waychison
2004-01-06 19:55 ` Mike Waychison
2004-01-06 21:01 ` H. Peter Anvin
2004-01-06 21:01 ` [autofs] " H. Peter Anvin
2004-01-06 21:44 ` Mike Waychison
2004-01-06 21:44 ` [autofs] " Mike Waychison
2004-01-06 21:50 ` Tim Hockin
2004-01-06 21:50 ` [autofs] " Tim Hockin
2004-01-06 22:06 ` H. Peter Anvin
2004-01-06 22:06 ` [autofs] " H. Peter Anvin
2004-01-06 22:17 ` Tim Hockin
[not found] ` <20040106221502.GA7398@hockin.org>
2004-01-06 22:20 ` H. Peter Anvin
2004-01-06 22:20 ` [autofs] " H. Peter Anvin
2004-01-07 16:19 ` Mike Waychison
2004-01-07 16:19 ` [autofs] " Mike Waychison
2004-01-07 17:55 ` H. Peter Anvin
2004-01-07 21:13 ` Mike Waychison
2004-01-06 22:28 ` name spaces good (was: [autofs] [RFC] Towards a Modern Autofs) Dax Kelson
2004-01-06 22:48 ` name spaces good H. Peter Anvin
2004-01-06 22:48 ` H. Peter Anvin
2004-01-07 21:14 ` [RFC] Towards a Modern Autofs Jim Carter
2004-01-07 21:14 ` [autofs] " Jim Carter
2004-01-07 22:55 ` Mike Waychison
2004-01-07 22:55 ` [autofs] " Mike Waychison
2004-01-08 12:00 ` Ian Kent
2004-01-08 12:00 ` [autofs] " Ian Kent
2004-01-08 15:39 ` Mike Waychison
2004-01-09 18:20 ` Ian Kent
2004-01-09 18:20 ` [autofs] " Ian Kent
2004-01-09 20:06 ` Mike Waychison
2004-01-09 20:06 ` [autofs] " Mike Waychison
2004-01-10 5:43 ` Ian Kent
2004-01-12 13:07 ` Mike Waychison
2004-01-12 16:01 ` raven
2004-01-12 16:26 ` Mike Waychison
2004-01-12 22:50 ` Tim Hockin
2004-01-12 23:28 ` Mike Waychison
2004-01-13 1:30 ` Ian Kent
2004-01-13 1:30 ` [autofs] " Ian Kent
2004-01-12 16:28 ` raven
2004-01-12 16:58 ` Mike Waychison
2004-01-13 1:54 ` Ian Kent
2004-01-13 1:54 ` [autofs] " Ian Kent
2004-01-13 19:01 ` Mike Waychison
2004-01-13 19:01 ` [autofs] " Mike Waychison
2004-01-14 15:58 ` raven
2004-01-14 19:32 ` running out of mount points Greg Bradner
2004-01-19 15:48 ` Greg Bradner
2004-01-19 17:11 ` Mike Waychison
2004-01-19 19:07 ` Greg Bradner
2004-01-20 19:15 ` Jim Carter
2004-01-13 18:46 ` [RFC] Towards a Modern Autofs Mike Waychison
2004-01-13 18:46 ` [autofs] " Mike Waychison
2004-01-09 20:51 ` Jim Carter
2004-01-09 20:51 ` [autofs] " Jim Carter
2004-01-10 5:56 ` Ian Kent
2004-01-08 17:34 ` H. Peter Anvin
2004-01-08 19:41 ` Mike Waychison
2004-01-08 23:42 ` Michael Clark
2004-01-09 20:28 ` Mike Waychison
2004-01-09 20:28 ` [autofs] " Mike Waychison
2004-01-09 20:54 ` H. Peter Anvin
2004-01-09 20:54 ` [autofs] " H. Peter Anvin
2004-01-09 21:43 ` Mike Waychison
2004-01-09 21:43 ` [autofs] " Mike Waychison
2004-01-09 18:32 ` Ian Kent
2004-01-09 18:32 ` [autofs] " Ian Kent
2004-01-09 20:52 ` Mike Waychison
2004-01-09 20:52 ` [autofs] " Mike Waychison
2004-01-10 6:05 ` Ian Kent
2004-01-08 12:29 ` Olivier Galibert
2004-01-08 13:20 ` Robin Rosenberg
2004-01-08 16:23 ` Mike Waychison
2004-01-08 12:35 ` Ian Kent
2004-01-08 13:08 ` Ian Kent
2004-01-08 18:20 ` Jim Carter
2004-01-08 21:01 ` H. Peter Anvin [this message]
2004-01-08 0:48 ` Ian Kent
2004-01-08 0:48 ` [autofs] " Ian Kent
-- strict thread matches above, loose matches on Subject: below --
2004-01-06 22:28 Ogden, Aaron A.
2004-01-06 22:41 ` Mike Fedyk
2004-01-06 22:47 ` Tim Hockin
2004-01-06 22:53 ` Paul Raines
2004-01-07 23:14 ` Jim Carter
2004-01-07 23:32 ` H. Peter Anvin
2004-01-08 12:52 ` Ian Kent
2004-01-08 12:52 ` Ian Kent
2004-01-08 18:31 ` viro
2004-01-09 18:43 ` Ian Kent
2004-01-09 19:41 ` Mike Waychison
2004-01-09 19:57 ` H. Peter Anvin
2004-01-09 21:31 ` Mike Waychison
2004-01-09 21:36 ` H. Peter Anvin
2004-01-06 23:34 Ogden, Aaron A.
2004-01-06 23:47 ` Tim Hockin
[not found] <1b5GC-29h-1@gated-at.bofh.it>
[not found] ` <1b6CO-3v0-15@gated-at.bofh.it>
2004-01-07 4:21 ` Andi Kleen
2004-01-07 17:50 ` H. Peter Anvin
2004-01-07 21:04 ` Mike Waychison
2004-01-07 21:11 ` Mike Fedyk
2004-01-07 23:40 ` Jesper Juhl
2004-01-07 21:24 ` Jeff Garzik
2004-01-07 23:47 ` Mike Waychison
2004-01-07 23:56 ` Jeff Garzik
2004-01-12 16:57 ` Mike Waychison
2004-01-13 7:39 ` Ian Kent
2004-01-08 19:32 trond.myklebust
2004-01-08 19:41 ` H. Peter Anvin
2004-01-08 20:08 ` trond.myklebust
2004-01-08 21:13 ` H. Peter Anvin
2004-01-08 22:20 ` J. Bruce Fields
2004-01-08 22:24 ` H. Peter Anvin
2004-01-09 20:37 ` Mike Waychison
2004-01-09 21:02 ` H. Peter Anvin
2004-01-09 21:52 ` Mike Waychison
2004-01-09 20:16 ` Mike Waychison
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