linux-kernel - Re: USB storage no-boot regression (bisected)

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Date:	Wed, 15 Apr 2009 11:47:38 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
cc:	Mark Lord <lkml@....ca>, Greg KH <greg@...ah.com>,
	Jeff Garzik <jeff@...zik.org>,
	Linux USB kernel mailing list <linux-usb@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: USB storage no-boot regression (bisected)

On Wed, 15 Apr 2009, Alan Cox wrote:

> Why should every user suffer a slower boot and a poorer resume time ?
> 
> Instead make the root fs mounting look like this
> 
> 
> 	while(my_rootfs_hasnt_appeared_and_i_am_sad()) {
> 		wait_on(&new_disk_discovery);
> 	}
> 
> and poke the queue whenever we add a relevant device.
> 
> That way if you are booting off an initrd you can finish the SATA probe
> in parallel to getting userspace ticking over.
> 
> On what is nowdays essentially a hot plug system it all needs turning
> this way up - eg RAID volumes should assemble and come online as the
> drives are discovered not at some fixed point later in userspace.

Indeed, something like this should also be used for 
resume-from-hibernation, to wait for the swap device.

Alan Stern

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