From: Jamie Lokier <jamie@shareable.org>
To: Linus Torvalds <torvalds@osdl.org>
Cc: viro@parcelfarce.linux.theplanet.co.uk,
David Woodhouse <dwmw2@infradead.org>,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
Andrew Morton <akpm@osdl.org>, Carsten Otte <cotte@de.ibm.com>,
Carsten Otte <cotte@freenet.de>,
linux-fsdevel@vger.kernel.org, sct@redhat.com,
Dave Kleikamp <shaggy@austin.ibm.com>
Subject: Re: [PATCH] ext3 [linux-2.6.2.]: accessing already freed inodes when under memory pressure
Date: Fri, 2 Apr 2004 20:17:52 +0100 [thread overview]
Message-ID: <20040402191752.GB653@mail.shareable.org> (raw)
In-Reply-To: <Pine.LNX.4.58.0404021050220.1122@ppc970.osdl.org>
Linus Torvalds wrote:
> I think that -EXDEV is not only OK, it's _required_. It may be the same
> physical filesystem, but it's a different mount and thus a different
> filesystem.
That reminds me. How is userspace supposed to determine when two
names are equivalent on different bind-mounted filesystems? stat()
returns the same value in st_dev for both names.
The usual strategy for detecting equivalent files is to check
st_nlink, and if that's not 1 compare (st_dev, st_ino). It doesn't
work for bind mounts, which is a very non-POSIX property.
I think the useful thing to do is return a different st_dev value for
each bind mount.
-- Jamie
next prev parent reply other threads:[~2004-04-02 19:18 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-30 11:57 [PATCH] ext3 [linux-2.6.2.]: accessing already freed inodes when under memory pressure Martin Schwidefsky
2004-03-30 13:39 ` David Woodhouse
2004-03-30 14:16 ` Matthew Wilcox
2004-03-30 15:51 ` Linus Torvalds
2004-04-02 16:12 ` viro
2004-04-02 18:01 ` viro
2004-04-02 18:52 ` Linus Torvalds
2004-04-02 19:02 ` Linus Torvalds
2004-04-02 19:10 ` viro
2004-04-02 19:07 ` viro
2004-04-02 20:23 ` viro
2004-04-02 22:40 ` Trond Myklebust
2004-04-02 23:06 ` viro
2004-04-02 23:23 ` Trond Myklebust
2004-04-03 0:53 ` Neil Brown
2004-04-02 23:19 ` Trond Myklebust
2004-04-02 19:17 ` Jamie Lokier [this message]
2004-04-02 19:25 ` viro
2004-04-02 19:32 ` Linus Torvalds
2004-04-02 19:37 ` viro
2004-04-02 19:45 ` Linus Torvalds
2004-04-02 20:08 ` viro
2004-04-02 20:40 ` Jamie Lokier
2004-04-02 20:59 ` Christoph Hellwig
2004-04-02 21:09 ` viro
2004-04-02 23:42 ` Jamie Lokier
2004-04-02 21:08 ` viro
2004-04-03 0:39 ` Jamie Lokier
2004-04-05 14:07 ` Stephen C. Tweedie
2004-03-30 15:07 ` Linus Torvalds
2004-04-02 16:14 ` viro
-- strict thread matches above, loose matches on Subject: below --
2004-03-30 15:13 Martin Schwidefsky
2004-03-29 19:07 Martin Schwidefsky
2004-03-29 20:11 ` Linus Torvalds
2004-03-29 20:29 ` Dave Kleikamp
2004-02-19 18:00 Martin Schwidefsky
2004-02-19 12:21 Carsten Otte
2004-02-19 16:53 ` Linus Torvalds
2004-02-19 17:39 ` Stephen C. Tweedie
2004-02-19 18:49 ` Andrew Morton
2004-02-19 20:28 ` Carsten Otte
2004-02-19 20:26 ` viro
2004-02-19 20:35 ` Carsten Otte
2004-02-19 20:14 ` Carsten Otte
2004-02-20 3:41 ` Andrew Morton
2004-02-19 20:19 ` Carsten Otte
[not found] ` <20040220164325.659c4e45.akpm@osdl.org>
[not found] ` <200402241338.57855.cotte@freenet.de>
2004-02-24 22:55 ` Andrew Morton
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