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block: fix bug in ptbl lookup cache

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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>
This commit is contained in:
Neil Brown 2009-01-07 08:55:39 +01:00 committed by Jens Axboe
parent 2150edc6c5
commit 54b0d12769
1 changed files with 1 additions and 0 deletions
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1
fs/partitions/check.c
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@ -334,6 +334,7 @@ void delete_partition(struct gendisk *disk, int partno)
blk_free_devt(part_devt(part));
rcu_assign_pointer(ptbl->part[partno], NULL);
rcu_assign_pointer(ptbl->last_lookup, NULL);
kobject_put(part->holder_dir);
device_del(part_to_dev(part));