From: Matthew Wilcox <matthew@wil.cx>
To: Jan Kara <jack@suse.cz>
Cc: Jiri Kosina <jkosina@suse.cz>, Michal Hocko <mhocko@suse.cz>,
Meelis Roos <mroos@linux.ee>,
Linux Kernel list <linux-kernel@vger.kernel.org>,
linux-fsdevel@vger.kernel.org
Subject: Re: file offset corruption on 32-bit machines?
Date: Thu, 10 Apr 2008 09:30:59 -0600 [thread overview]
Message-ID: <20080410153058.GT11962@parisc-linux.org> (raw)
In-Reply-To: <20080410152212.GF6725@atrey.karlin.mff.cuni.cz>
On Thu, Apr 10, 2008 at 05:22:12PM +0200, Jan Kara wrote:
> You can get your inspiration in the implementation of i_size_read()
> and i_size_write() functions :). They deal with exactly the same problem.
> But in the case of f_pos, the number of readers and writers is balanced so
> maybe a spinlock would be fine as well...
It's not quite balanced -- see sys_getdents() for a counterexample.
i_size_read/write use a seqcount rather than a seqlock, but the
principle is the same.
--
Intel are signing my paycheques ... these opinions are still mine
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours. We can't possibly take such
a retrograde step."
next prev parent reply other threads:[~2008-04-10 15:31 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-08 8:05 file offset corruption on 32-bit machines? Meelis Roos
2008-04-10 13:55 ` Michal Hocko
2008-04-10 14:01 ` Jiri Kosina
2008-04-10 14:27 ` Jan Kara
2008-04-10 14:31 ` Jiri Kosina
2008-04-10 14:48 ` Matthew Wilcox
2008-04-10 15:22 ` Jan Kara
2008-04-10 15:30 ` Matthew Wilcox [this message]
2008-04-10 15:19 ` Jan Kara
2008-04-10 15:37 ` Michal Hocko
2008-04-10 15:56 ` Jan Kara
2008-04-10 16:03 ` Diego Calleja
2008-04-10 16:15 ` Jan Kara
2008-04-11 19:26 ` Pavel Machek
2008-04-14 16:25 ` Jan Kara
2008-04-10 14:31 ` Michal Hocko
2008-04-10 14:35 ` Jiri Kosina
2008-04-10 14:11 ` Martin Mares
2008-04-10 15:12 ` Jan Kara
2008-04-10 15:14 ` Jamie Lokier
2008-04-10 15:21 ` Matthew Wilcox
2008-04-10 15:28 ` Jan Kara
2008-04-10 15:33 ` Andi Kleen
[not found] <agh4d-6yc-35@gated-at.bofh.it>
[not found] ` <ah5tY-3lR-7@gated-at.bofh.it>
[not found] ` <ah5DA-3X9-9@gated-at.bofh.it>
[not found] ` <ah5X5-4tl-13@gated-at.bofh.it>
[not found] ` <ah66A-4Nk-7@gated-at.bofh.it>
[not found] ` <ah7vN-7Wz-9@gated-at.bofh.it>
2008-04-11 12:24 ` Bodo Eggert
2008-04-11 13:55 ` Lennart Sorensen
2008-04-11 16:59 ` Bryan Henderson
2008-04-11 17:15 ` Lennart Sorensen
2008-04-11 21:29 ` Bryan Henderson
2008-04-12 8:48 ` Pavel Machek
2008-04-14 16:20 ` Jan Kara
2008-04-14 16:22 ` Lennart Sorensen
2008-04-14 16:53 ` Jan Kara
2008-04-14 16:54 ` Alan Cox
2008-04-14 18:34 ` Alexey Dobriyan
2008-04-14 17:06 ` Lennart Sorensen
2008-04-14 19:03 ` Jan Kara
2008-04-14 19:29 ` Lennart Sorensen
2008-04-14 19:42 ` Jan Kara
2008-04-14 19:45 ` Lennart Sorensen
2008-04-15 8:57 ` Pavel Machek
2008-04-15 15:32 ` Lennart Sorensen
2008-04-15 17:34 ` Pavel Machek
2008-04-15 18:24 ` Lennart Sorensen
2008-04-15 19:12 ` Pavel Machek
2008-04-15 19:49 ` Lennart Sorensen
2008-04-15 20:06 ` Pavel Machek
2008-04-15 20:28 ` Peter Zijlstra
2008-04-16 8:15 ` Pavel Machek
2008-04-16 8:20 ` Peter Zijlstra
2008-04-16 10:54 ` Alan Cox
2008-04-16 13:57 ` Lennart Sorensen
2008-04-15 20:29 ` Lennart Sorensen
2008-04-15 22:11 ` Bryan Henderson
2008-04-16 9:40 ` Jamie Lokier
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