From: Jan Blunck <jblunck@suse.de>
To: Kirill Korotaev <dev@sw.ru>
Cc: Olaf Hering <olh@suse.de>,
linux-kernel@vger.kernel.org, Andrew Morton <akpm@osdl.org>
Subject: Re: [PATCH] Busy inodes after unmount, be more verbose in generic_shutdown_super
Date: Thu, 19 Jan 2006 11:04:44 +0100 [thread overview]
Message-ID: <20060119100443.GD10267@hasse.suse.de> (raw)
In-Reply-To: <43CF6170.3050608@sw.ru>
On Thu, Jan 19, Kirill Korotaev wrote:
> This patch has nothing to do with vfsmount references and doesn't hide
> anything. It just adds syncronization barrier between do_umount() and
> shrink_dcache() since the latter can work with dentries/inodes without
> holding locks.
>
> So if you think there is something wrong with it, please, be more specific.
>
You can only unmount a file system if there are no references to the vfsmount
object anymore. Since shrink_dcache*() is called after checking the refcount of
vfsmount while unmounting the file system, it isn't possible to hold a
reference to a dentry (and therefore call dput()) after this point in
time. Therefore your reference counting on the vfsmount is wrong which is the
root case for your problem of busy inodes.
Regards,
Jan
--
Jan Blunck jblunck@suse.de
SuSE LINUX AG - A Novell company
Maxfeldstr. 5 +49-911-74053-608
D-90409 Nürnberg http://www.suse.de
next prev parent reply other threads:[~2006-01-19 10:04 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-16 22:34 [PATCH] Busy inodes after unmount, be more verbose in generic_shutdown_super Olaf Hering
2006-01-16 23:23 ` Kirill Korotaev
2006-01-16 23:29 ` Olaf Hering
2006-01-17 2:05 ` Andrew Morton
2006-01-17 7:03 ` Kirill Korotaev
2006-01-18 22:49 ` Jan Blunck
2006-01-18 23:10 ` Andrew Morton
2006-01-19 10:08 ` Kirill Korotaev
2006-01-19 9:52 ` Kirill Korotaev
2006-01-19 10:04 ` Jan Blunck [this message]
2006-01-19 10:26 ` Kirill Korotaev
2006-01-20 19:06 ` Jan Blunck
2006-01-23 8:14 ` Kirill Korotaev
2006-01-30 11:54 ` Jan Blunck
2006-01-30 14:05 ` Kirill Korotaev
2006-01-30 14:21 ` Jan Blunck
2006-01-30 14:34 ` Kirill Korotaev
2006-03-02 6:57 Neil Brown
2006-03-02 10:48 ` Jan Blunck
2006-03-03 11:42 ` Jan Blunck
2006-03-06 6:09 ` Neil Brown
2006-03-06 7:32 ` Balbir Singh
2006-03-07 1:58 ` Neil Brown
2006-03-07 2:49 ` Balbir Singh
2006-03-07 6:22 ` Kirill Korotaev
2006-03-07 6:16 ` Kirill Korotaev
2006-03-07 7:03 ` Balbir Singh
2006-03-07 7:21 ` Kirill Korotaev
2006-03-07 11:05 ` Balbir Singh
2006-03-08 0:29 ` Neil Brown
2006-03-08 2:17 ` Balbir Singh
2006-03-08 2:39 ` Neil Brown
2006-03-08 3:05 ` Balbir Singh
2006-03-08 11:01 ` Jan Blunck
2006-03-06 11:56 ` Jan Blunck
2006-03-07 2:15 ` Neil Brown
2006-03-06 11:56 ` Kirill Korotaev
2006-03-07 2:01 ` Neil Brown
2006-03-07 6:20 ` Kirill Korotaev
2006-03-07 23:20 ` Neil Brown
2006-03-09 12:03 ` Kirill Korotaev
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