linux-kernel - Re: todays git regression (2.6.32-04008.g3ff6a46): lot of device mapper warnings

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Date:	Wed, 9 Dec 2009 23:07:49 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Heinz Diehl <htd@...cy-poultry.org>
Cc:	linux-kernel@...r.kernel.org, martin.petersen@...cle.com
Subject: Re: todays git regression (2.6.32-04008.g3ff6a46): lot of device
	mapper warnings

On Wed, Dec 09 2009, Jens Axboe wrote:
> On Wed, Dec 09 2009, Heinz Diehl wrote:
> > On 09.12.2009, Christian Borntraeger wrote: 
> > 
> > > with todays git I got a huge amount of warnings for device mapper:
> > > device-mapper: uevent: version 1.0.3                                                                              
> > > device-mapper: ioctl: 4.15.0-ioctl (2009-04-01) initialised: dm-devel@...hat.com                                  
> > > device-mapper: table: 252:0: target device dasdf1 is misaligned: physical_block_size=4096, logical_block_size=4096, alignment_offset=0, start=196608                                                                                
> > [...]
> >  
> > > The same devices produce no warning with a 2.6.32 vanilla kernel.
> > 
> > I have exactly the same here...
> 
> Can either one of you try and bisect it? I've cc'ed Martin, it's likely
> one of the io stacking patches that causes this.

Does this work?

diff --git a/block/blk-settings.c b/block/blk-settings.c
index dd1f1e0..0116d29 100644
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -554,11 +554,13 @@ int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
 		ret = -1;
 	}
 
+#if 0
 	if (offset &&
 	    (offset & (b->discard_granularity - 1)) != b->discard_alignment) {
 		t->discard_misaligned = 1;
 		ret = -1;
 	}
+#endif
 
 	/* If top has no alignment offset, inherit from bottom */
 	if (!t->alignment_offset)

-- 
Jens Axboe

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