linux-kernel - Re: [026/146] block: dont block events on excl write for non-optical

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Date:	Wed, 1 Jun 2011 17:58:16 +0900
From:	Greg KH <gregkh@...e.de>
To:	Tejun Heo <tj@...nel.org>
Cc:	linux-kernel@...r.kernel.org, stable@...nel.org,
	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Jens Axboe <jaxboe@...ionio.com>
Subject: Re: [026/146] block: dont block events on excl write for non-optical

On Wed, Jun 01, 2011 at 05:15:14PM +0900, Tejun Heo wrote:
> Hello, Greg.
> 
> On Wed, Jun 01, 2011 at 04:59:22PM +0900, Greg KH wrote:
> > 2.6.38-stable review patch.  If anyone has any objections, please let us know.
> > 
> > ------------------
> >  devices
> > 
> > From: Tejun Heo <tj@...nel.org>
> > 
> > commit d4dc210f69bcb0b4bef5a83b1c323817be89bad1 upstream.
> > 
> > Disk event code automatically blocks events on excl write.  This is
> > primarily to avoid issuing polling commands while burning is in
> > progress.  This behavior doesn't fit other types of devices with
> > removeable media where polling commands don't have adverse side
> > effects and door locking usually doesn't exist.
> > 
> > This patch introduces new genhd flag which controls the auto-blocking
> > behavior and uses it to enable auto-blocking only on optical devices.
> > 
> > Note for stable: 2.6.38 and later only
> 
> This one should be accompanied by the following commit which is
> currently in Jens' tree and will soon be pulled into Linus' tree.
> Sorry about the fuss.  ->check_events() update turned out to be much
> more fragile than I originally expected.  :(
> 
> commit 4c49ff3fe128ca68dabd07537415c419ad7f82f9
> Author: Tejun Heo <tj@...nel.org>
> Date:   Wed Jun 1 08:27:41 2011 +0200
> 
>     block: blkdev_get() should access ->bd_disk only after success

As I can't take it into -stable until it hits Linus's tree, I'll have to
wait until then.  Hopefully it hits there soon, I'll watch out for it.

thanks for letting me know.

greg k-h
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