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: <Pine.LNX.4.44L0.0801061722400.19222-100000@netrider.rowland.org>
Date:	Sun, 6 Jan 2008 17:26:17 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Oliver Neukum <oliver@...kum.org>
cc:	Pavel Machek <pavel@....cz>,
	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 Sun, 6 Jan 2008, Oliver Neukum wrote:

> Am Sonntag 06 Januar 2008 schrieb Alan Stern:
> > What about people who want to suspend to RAM instead of hibernating and
> > _do_ want to unplug the USB device containing their root filesystem
> > while the machine is asleep?  In this case we will _know_ that the
> > power session has been interrupted, but USB Persist won't activate
> > because the host controller never lost power.
> 
> Would it be hard to force the persist feature on for a replugged device?

Right now the persist feature is enabled by a per-device boolean flag.  
In theory the flag could accept 3 values: off, on if power was lost,
or on for any resume transition.  This would not be a hard change.

Alan Stern

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