On Tue, Apr 02 2013, CAI Qian wrote: > > > ----- Original Message ----- > > From: "Jens Axboe" <axboe@xxxxxxxxx> > > To: "Dave Chinner" <david@xxxxxxxxxxxxx> > > Cc: "CAI Qian" <caiqian@xxxxxxxxxx>, xfs@xxxxxxxxxxx, "LKML" <linux-kernel@xxxxxxxxxxxxxxx> > > 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 _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
