On Tue, Apr 02 2013, CAI Qian wrote:
>
>
> ----- Original Message -----
> > From: "Jens Axboe" <ax...@kernel.dk>
> > To: "Dave Chinner" <da...@fromorbit.com>
> > Cc: "CAI Qian" <caiq...@redhat.com>, x...@oss.sgi.com, "LKML"
> > <linux-kernel@vger.kernel.org>
> > Sent: Tuesday, April 2, 2013 3:30:35 PM
> > Subject: Re: Loopback device hung [was Re: xfs deadlock on 3.9-rc5 running
> > xfstests case #78]
> >
> > On Tue, Apr 02 2013, Jens Axboe wrote:
> > > On Tue, Apr 02 2013, Dave Chinner wrote:
> > > > [Added jens Axboe to CC]
> > > >
> > > > On Tue, Apr 02, 2013 at 02:08:49AM -0400, CAI Qian wrote:
> > > > > Saw on almost all the servers range from x64, ppc64 and s390x with
> > > > > kernel
> > > > > 3.9-rc5 and xfsprogs-3.1.10. Never caught this in 3.9-rc4, so looks
> > > > > like
> > > > > something new broke this. Log is here with sysrq debug info.
> > > > > http://people.redhat.com/qcai/stable/log
> > >
> > > CAI Qian, can you try and back the below out and test again?
> >
> > Nevermind, it's clearly that one. The below should improve the
> > situation, but it's not pretty. A better fix would be to allow
> > auto-deletion even if PART_NO_SCAN is set.
> Jens, when compiled the mainline (up to fefcdbe) with this patch,
> it error-ed out,
Looks like I sent the wrong one, updated below.
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index fe5f640..faa3afa 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -1057,14 +1057,15 @@ static int loop_clr_fd(struct loop_device *lo)
struct disk_part_iter piter;
struct hd_struct *part;
- mutex_lock_nested(&bdev->bd_mutex, 1);
- invalidate_partition(bdev->bd_disk, 0);
- disk_part_iter_init(&piter, bdev->bd_disk,
- DISK_PITER_INCL_EMPTY);
- while ((part = disk_part_iter_next(&piter)))
- delete_partition(bdev->bd_disk, part->partno);
- disk_part_iter_exit(&piter);
- mutex_unlock(&bdev->bd_mutex);
+ if (mutex_trylock(&bdev->bd_mutex)) {
+ invalidate_partition(bdev->bd_disk, 0);
+ disk_part_iter_init(&piter, bdev->bd_disk,
+ DISK_PITER_INCL_EMPTY);
+ while ((part = disk_part_iter_next(&piter)))
+ delete_partition(bdev->bd_disk, part->partno);
+ disk_part_iter_exit(&piter);
+ mutex_unlock(&bdev->bd_mutex);
+ }
}
/*
--
Jens Axboe
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