Re: Loopback device hung [was Re: xfs deadlock on 3.9-rc5 runningxfstests case #78]
From: Dave Chinner
Date: Tue Apr 09 2013 - 03:08:56 EST
On Tue, Apr 09, 2013 at 09:01:39AM +0200, Jens Axboe wrote:
> On Tue, Apr 09 2013, Dave Chinner wrote:
> > On Thu, Apr 04, 2013 at 04:30:54PM -0400, Phillip Susi wrote:
> > > > I have not tested it yet, but I am pretty sure it won't work. It
> > > > looks like the patch changes the BLKRRPART path to go ahead and remove
> > > > existing partitions when GENHD_FL_NO_PARTSCAN is set. loop doesn't
> > > > issue the BLKRRPART ioctl when !LO_FLAGS_PARTSCAN so this won't help.
> > > > I think loop needs to set GENHD_FL_NO_PARTSCAN and then issue the
> > > > ioctl regardless of the LO_FLAGS_PARTSCAN flag to get the partitions
> > > > to be removed. I will try to test tonight.
> > >
> > > After testing, my initial thoughts appeared to have been correct. I had
> > > to modify the patch as follows. To test, simply do:
> > >
> > > truncate -s 10m img
> > > losetup /dev/loop0 img
> > > parted /dev/loop0
> > > mklabel msdos
> > > mkpart primary ext2 1m 2m
> > > quit
> > > ls /dev/loop0*
> > >
> > > Note the /dev/loop0p1 node. Run losetup -d /dev/loop0 and see if it is
> > > still there.
> > Jens, can we get one of these fixes merged quickly? xfstests is
> > unusable on any kernel more recent than 3.9-rc4 because of these
> > problems....
> Yep, did the revert yesterday and it's going out today.
Great, I didn't see an update in the latest -rc, so I wanted to make
sure it hadn't fallen through he cracks....
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