From: Frank van Maarseveen <frankvm@frankvm.com>
To: Mikulas Patocka <mikulas@artax.karlin.mff.cuni.cz>
Cc: Jan Harkes <jaharkes@cs.cmu.edu>, Pavel Machek <pavel@suse.cz>,
Arjan van de Ven <arjan@infradead.org>,
Miklos Szeredi <miklos@szeredi.hu>,
linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: Re: Finding hardlinks
Date: Wed, 3 Jan 2007 19:58:15 +0100 [thread overview]
Message-ID: <20070103185815.GA2182@janus> (raw)
In-Reply-To: <Pine.LNX.4.64.0701020055580.32128@artax.karlin.mff.cuni.cz>
On Tue, Jan 02, 2007 at 01:04:06AM +0100, Mikulas Patocka wrote:
>
> I didn't hardlink directories, I just patched stat, lstat and fstat to
> always return st_ino == 0 --- and I've seen those failures. These failures
> are going to happen on non-POSIX filesystems in real world too, very
> rarely.
I don't want to spoil your day but testing with st_ino==0 is a bad choice
because it is a special number. Anyway, one can only find breakage,
not prove that all the other programs handle this correctly so this is
kind of pointless.
On any decent filesystem st_ino should uniquely identify an object and
reliably provide hardlink information. The UNIX world has relied upon this
for decades. A filesystem with st_ino collisions without being hardlinked
(or the other way around) needs a fix.
Synthetic filesystems such as /proc are special due to their dynamic
nature and I think st_ino uniqueness is far more important than being able
to provide hardlinks there. Most tree handling programs ("cp", "rm", ...)
break horribly when the tree underneath changes at the same time.
--
Frank
next prev parent reply other threads:[~2007-01-03 19:15 UTC|newest]
Thread overview: 100+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-12-20 9:03 Finding hardlinks Mikulas Patocka
2006-12-20 11:44 ` Miklos Szeredi
2006-12-20 16:36 ` Mikulas Patocka
2006-12-20 16:50 ` Miklos Szeredi
2006-12-20 19:54 ` Al Viro
2006-12-20 20:12 ` Mikulas Patocka
2006-12-31 15:02 ` Mikulas Patocka
2006-12-21 18:58 ` Jan Harkes
2006-12-21 23:49 ` Mikulas Patocka
2006-12-22 5:05 ` Jan Harkes
2006-12-23 10:18 ` Arjan van de Ven
2006-12-23 14:00 ` Mikulas Patocka
2006-12-28 9:06 ` Benny Halevy
2006-12-28 10:05 ` Arjan van de Ven
2006-12-28 15:24 ` Benny Halevy
2006-12-28 19:58 ` Miklos Szeredi
2007-01-02 19:15 ` Pavel Machek
2007-01-02 20:41 ` Miklos Szeredi
2007-01-02 20:50 ` Mikulas Patocka
2007-01-02 21:10 ` Miklos Szeredi
2007-01-02 21:37 ` Mikulas Patocka
2007-01-03 11:56 ` Pavel Machek
2007-01-03 12:33 ` Miklos Szeredi
2007-01-03 12:42 ` Pavel Machek
2007-01-11 23:43 ` Denis Vlasenko
2007-01-03 12:45 ` Martin Mares
2007-01-03 13:54 ` Matthew Wilcox
2007-01-03 15:51 ` Miklos Szeredi
2007-01-03 19:04 ` Mikulas Patocka
2007-01-04 22:59 ` Pavel Machek
2007-01-05 8:43 ` Miklos Szeredi
2007-01-05 13:12 ` Pavel Machek
2007-01-05 13:55 ` Miklos Szeredi
2007-01-05 14:08 ` Mikulas Patocka
2007-01-05 15:09 ` Miklos Szeredi
2007-01-05 15:15 ` Miklos Szeredi
2007-01-08 11:27 ` Pavel Machek
2007-01-08 5:57 ` Mikulas Patocka
2007-01-08 8:49 ` Miklos Szeredi
2007-01-08 11:29 ` Pavel Machek
2007-01-08 12:00 ` Miklos Szeredi
2007-01-08 13:26 ` Martin Mares
2007-01-08 13:39 ` Miklos Szeredi
2007-01-09 16:26 ` Steven Rostedt
2007-01-09 19:53 ` Frank van Maarseveen
2007-01-09 20:11 ` Steven Rostedt
2007-01-11 10:07 ` Pádraig Brady
2007-01-05 17:30 ` Frank van Maarseveen
2006-12-28 18:14 ` Mikulas Patocka
2006-12-29 10:34 ` Trond Myklebust
2006-12-30 1:04 ` Mikulas Patocka
2007-01-01 2:30 ` Nikita Danilov
2007-01-01 22:58 ` Mikulas Patocka
2007-01-01 23:05 ` Nikita Danilov
2007-01-01 23:22 ` Mikulas Patocka
2007-01-04 13:59 ` Nikita Danilov
2007-01-02 23:14 ` Trond Myklebust
2007-01-02 23:50 ` Mikulas Patocka
2006-12-28 13:22 ` Jeff Layton
2006-12-28 15:12 ` Benny Halevy
2006-12-28 15:54 ` Jeff Layton
2006-12-28 16:26 ` Jan Engelhardt
2006-12-28 18:17 ` Mikulas Patocka
2006-12-28 20:07 ` Halevy, Benny
2006-12-29 10:28 ` [nfsv4] " Trond Myklebust
2006-12-31 21:25 ` Halevy, Benny
2007-01-02 23:21 ` Trond Myklebust
2007-01-03 12:35 ` Benny Halevy
2007-01-04 0:43 ` Trond Myklebust
2007-01-04 8:36 ` Trond Myklebust
2007-01-04 10:04 ` Benny Halevy
2007-01-04 10:47 ` Trond Myklebust
2007-01-05 8:28 ` Benny Halevy
2007-01-05 10:29 ` Trond Myklebust
2007-01-05 16:40 ` Nicolas Williams
2007-01-05 16:56 ` Trond Myklebust
2007-01-06 7:44 ` Halevy, Benny
2007-01-10 13:04 ` Benny Halevy
2006-12-29 10:12 ` Trond Myklebust
2006-12-31 21:19 ` Halevy, Benny
2007-01-02 23:20 ` Trond Myklebust
2007-01-02 23:46 ` Trond Myklebust
2007-01-11 23:35 ` Denis Vlasenko
2006-12-29 10:02 ` Pavel Machek
2007-01-01 22:47 ` Mikulas Patocka
2007-01-01 23:53 ` Jan Harkes
2007-01-02 0:04 ` Mikulas Patocka
2007-01-03 18:58 ` Frank van Maarseveen [this message]
2007-01-03 19:17 ` Mikulas Patocka
2007-01-03 19:26 ` Frank van Maarseveen
2007-01-03 19:31 ` Mikulas Patocka
2007-01-03 20:26 ` Frank van Maarseveen
2007-01-12 0:00 ` Denis Vlasenko
2007-01-03 22:30 ` Pavel Machek
2007-01-03 21:09 ` Bryan Henderson
2007-01-03 22:01 ` Frank van Maarseveen
2007-01-03 23:43 ` Mikulas Patocka
2007-01-04 0:12 ` Frank van Maarseveen
2007-01-08 6:19 ` Mikulas Patocka
[not found] <7x5mR-2wX-3@gated-at.bofh.it>
[not found] ` <7x9Ad-18O-35@gated-at.bofh.it>
[not found] ` <7yXEy-UI-39@gated-at.bofh.it>
[not found] ` <7yYKa-2Ds-3@gated-at.bofh.it>
[not found] ` <7zcWP-7ET-5@gated-at.bofh.it>
[not found] ` <7zdzA-jc-27@gated-at.bofh.it>
[not found] ` <7zeP5-2ic-15@gated-at.bofh.it>
[not found] ` <7zgH9-5my-17@gated-at.bofh.it>
[not found] ` <7zJSM-14t-9@gated-at.bofh.it>
[not found] ` <7zSW5-6cj-9@gated-at.bofh.it>
[not found] ` <7zX9l-4rS-7@gated-at.bofh.it>
[not found] ` <7zXMb-5g5-27@gated-at.bofh.it>
2007-01-05 23:54 ` Bodo Eggert
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