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dm: fix sparse "unexpected unlock" warnings in ioctl code
Rename dm_get_live_table_for_ioctl to dm_grab_bdev_for_ioctl and have it do the dm_{get,put}_live_table() rather than split those operations. The dm_grab_bdev_for_ioctl() callers only care about the block_device associated with a singleton DM device so there isn't any need to retain a reference to the live DM table. It is sufficient to: 1) dm_get_live_table() 2) bdgrab() the bdev associated with the singleton table's target 3) dm_put_live_table() 4) bdput() the bdev Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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