Neil Brown 54b0d12769 block: fix bug in ptbl lookup cache ... Neil writes: Hi Jens, I've found a little bug for you. It was introduced by a6f23657d3 block: add one-hit cache for disk partition lookup and has the effect of killing my machine whenever I try to assemble an md array :-( One of the devices in the array has partitions, and mdadm always deletes partitions before putting a whole-device in an array (as it can cause confusion). The next IO to that device locks the machine. I don't really understand exactly why it locks up, but it happens in disk_map_sector_rcu(). This patch fixes it. Which is due to a missing clear of the (now) stale partition lookup data. So clear that when we delete a partition. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>		2009-01-09 21:46:13 +01:00
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