linux-kernel - Re: USB: on suspend to ram/disk all usb devices are replugged

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Message-Id: <1175898230.6481.87.camel@nigel.suspend2.net>
Date:	Sat, 07 Apr 2007 08:23:50 +1000
From:	Nigel Cunningham <nigel@...el.suspend2.net>
To:	Pavel Machek <pavel@....cz>
Cc:	Chuck Ebbert <cebbert@...hat.com>,
	Alan Stern <stern@...land.harvard.edu>,
	David Zeuthen <davidz@...hat.com>,
	Maxim <maximlevitsky@...il.com>,
	Pete Zaitcev <zaitcev@...hat.com>, gregkh@...e.de,
	Kernel development list <linux-kernel@...r.kernel.org>,
	USB development list <linux-usb-devel@...ts.sourceforge.net>
Subject: Re: USB: on suspend to ram/disk all usb devices are replugged

Hi.

On Mon, 2007-04-02 at 21:36 +0200, Pavel Machek wrote:
> Hi!
> 
> > > But you're still likely to run into trouble if you unplug a storage
> > > device, move it to another system and write on it, then plug it back into
> > > the original system.  The PLVM would somehow have to recognize that the
> > > data had been changed.  I don't know a foolproof way of doing that.
> > > 
> > 
> > Mark the filesystem as in-use with a one-time UUID in the superblock at
> > mount time. If one moved the drive to another system it would require
> > an fsck to clear the UUID before the other system could use it; then
> > the original machine would refuse to use the drive when the UUID didn't
> > match on resume.
> 
> You still need fs-specific code, I'm afraid... plus userland tool
> to reset signatures back.

You don't need userland to reset the signatures. More kernel code, sure.
But it doesn't _need_ to be userland.

Regards,

Nigel

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