linux-kernel - Re: [linux-usb-devel] [FEATURE REQUEST] Transparent hot plugging of root file system on portable storage devices.

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Message-ID: <20080105215209.GB21565@elf.ucw.cz>
Date:	Sat, 5 Jan 2008 22:52:09 +0100
From:	Pavel Machek <pavel@....cz>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Oliver Neukum <oliver@...kum.org>,
	Raymano Garibaldi <raymano@...nos.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Denys Vlasenko <vda.linux@...glemail.com>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	USB development list <linux-usb-devel@...ts.sourceforge.net>
Subject: Re: [linux-usb-devel] [FEATURE REQUEST] Transparent hot plugging
	of root file system on portable storage devices.

On Wed 2008-01-02 15:23:30, Alan Stern wrote:
> On Wed, 2 Jan 2008, Oliver Neukum wrote:
> 
> > Am Dienstag 01 Januar 2008 schrieb Pavel Machek:
> > > Hi1
> > > 
> > > > I would like to request a feature in the Linux kernel that would allow
> > > > a user to unplug a live read-only root file system which exists on a
> > > > detachable storage device such as a USB key drive. The desired
> > > > behavior is that once the same device is reattached to the computer
> > > > the user can continue work transparently without having to reboot.
> > > > 
> > > > Having such a feature is becoming more important with advances in
> > > > detachable solid state drive technology.
> > > 
> > > Yep, that would be nice.... In fact, patch would be very welcome :-).
> > 
> > Use the USB persist feature and hibernate. It should work. If you modify
> > the fs in any way, you'll crash and burn. Unmounting / is harder which you
> > need if you want to do this safely.
> 
> What about people who prefer (for reasons of restart latency or
> non-availability of swap space) to suspend rather than hibernate?

For suspend to RAM, we can keep the power session, and be _sure_ noone
unplugged our USB disks, right? So that one should work nicely.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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