linux-kernel - Re: Loopback device hung [was Re: xfs deadlock on 3.9-rc5 running xfstests case #78]

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Date:	Tue, 28 May 2013 10:51:02 -0400
From:	Phillip Susi <psusi@...ntu.com>
To:	Jens Axboe <axboe@...nel.dk>
CC:	CAI Qian <caiqian@...hat.com>, Dave Chinner <david@...morbit.com>,
	xfs@....sgi.com, LKML <linux-kernel@...r.kernel.org>
Subject: Re: Loopback device hung [was Re: xfs deadlock on 3.9-rc5 running
 xfstests case #78]

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Hi Jens, did this get lost in the shuffle, or just miss the window for
3.10 and will go in 3.11?

On 4/4/2013 4:30 PM, 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.
> 
> 

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