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

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Date:	Fri, 3 Jun 2011 15:02:54 +0900
From:	Greg KH <greg@...ah.com>
To:	Jens Axboe <jaxboe@...ionio.com>
Cc:	Greg KH <gregkh@...e.de>, Tejun Heo <tj@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"stable@...nel.org" <stable@...nel.org>,
	"stable-review@...nel.org" <stable-review@...nel.org>,
	"torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"alan@...rguk.ukuu.org.uk" <alan@...rguk.ukuu.org.uk>
Subject: Re: [026/146] block: dont block events on excl write for non-optical

On Wed, Jun 01, 2011 at 11:15:56AM +0200, Jens Axboe wrote:
> On 2011-06-01 10:58, Greg KH wrote:
> > 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.
> 
> It'll go out in the next few days. The above commit also references this
> patch, so you should have proper notification when it goes in.

Did it go in?  I see commit 0f48f2600911d5de6393829e4a9986d4075558b3
which looks like it might have been it, right?  Or do I need something
else for .39-stable?

confused,

greg k-h
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