From: Nikita Danilov <nikita@clusterfs.com>
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Message-ID: <17319.59046.509655.614168@gargle.gargle.HOWL>
Date: Tue, 20 Dec 2005 14:10:30 +0300
To: Coywolf Qi Hunt <coywolf@gmail.com>
Cc: Willy Tarreau <willy@w.ods.org>, john stultz <johnstul@us.ibm.com>,
       lkml <linux-kernel@vger.kernel.org>, greg@kroah.com, axboe@suse.de,
       vandrove@vc.cvut.cz, aia21@cam.ac.uk, akpm@osdl.org
Subject: Re: [RFC] Let non-root users eject their ipods?
Newsgroups: gmane.linux.kernel
In-Reply-To: <2cd57c900512200131l4ff29837o@mail.gmail.com>
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	<20051220051821.GM15993@alpha.home.local>
	<2cd57c900512192206g7292cb1m@mail.gmail.com>
	<20051220085653.GA3137@favonius>
	<2cd57c900512200131l4ff29837o@mail.gmail.com>
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Coywolf Qi Hunt writes:
 > 2005/12/20, Sander <sander@humilis.net>:
 > > Coywolf Qi Hunt wrote (ao):

[...]

 > > > IMHO, umount doesn't guarantee sync, isn't it?
 > 
 > Actually I was think umount(2), since this is the kernel list, but off
 > topic here.
 > 
 > >
 > > I'm pretty sure it does :-)
 > 
 > That is because: usually your removable media is not the file system
 > root, hence umount(8) can return successfully only if no processes are
 > busy working on it.
 > 
 > If you boot from or chroot/pivot into a removable media, and you
 > remount it ro, and unplug it, then you may lose data.

sys_umount() writes all cached data back, see generic_shutdown_super()->fsync_super()

 > 
 > -- coywolf

Nikita.
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