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Date: Wed, 23 Aug 2006 13:51:57 -0400 (EDT) From: Jason Baron <jbaron@...hat.com> To: Andrew Morton <akpm@...l.org> cc: neilb@...e.de, arjan@...radead.org, mingo@...hat.com, axboe@...e.de, a.p.zijlstra@...llo.nl, linux-kernel@...r.kernel.org Subject: Re: [PATCH] block_dev.c mutex_lock_nested() fix On Wed, 23 Aug 2006, Andrew Morton wrote: > On Wed, 23 Aug 2006 11:09:35 -0400 (EDT) > Jason Baron <jbaron@...hat.com> wrote: > > > > > Hi, > > > > In the case below we are locking the whole disk not a partition. This > > change simply brings the code in line with the piece above where when we > > are the 'first' opener, and we are a partition. > > > > thanks, > > > > -Jason > > > > Signed-off-by: Jason Baron <jbaron@...hat.com> > > > > --- linux-2.6/fs/block_dev.c.bak > > +++ linux-2.6/fs/block_dev.c > > @@ -966,7 +966,7 @@ do_open(struct block_device *bdev, struc > > rescan_partitions(bdev->bd_disk, bdev); > > } else { > > mutex_lock_nested(&bdev->bd_contains->bd_mutex, > > - BD_MUTEX_PARTITION); > > + BD_MUTEX_WHOLE); > > bdev->bd_contains->bd_part_count++; > > mutex_unlock(&bdev->bd_contains->bd_mutex); > > } > > This was allegedly (re-re-re-re-)fixed in 2.6.18-rc4-mm2. > lockdep-fix-blkdev_open-warning.patch and > lockdep-fix-blkdev_open-warning-fix.patch. > > Is this patch needed in that kernel? > yes. Those patches address a similar type of issue, but not this specific one. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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