[dm-devel] [PATCH v2] dm mpath: maintain reference count for underlying devices
Jun'ichi Nomura
j-nomura at ce.jp.nec.com
Tue Oct 18 13:00:48 UTC 2011
On 10/18/11 05:15, Mike Snitzer wrote:
> FYI, this patch from Tejun should also fix the concern I had relative to
> mpath's underlying devices' request_queues:
> https://lkml.org/lkml/2011/10/16/148
Oh, that's good information.
Since the following commit, a queue can be accessed
after the device being released:
commit f758eeabeb96f878c860e8f110f94ec8820822a9
Author: Christoph Hellwig <hch at infradead.org>
Date: Thu Apr 21 18:19:44 2011 -0600
writeback: split inode_wb_list_lock into bdi_writeback.list_lock
I.e.
__blkdev_put
disk->fops->release()
..
bdev_inode_switch_bdi()
bdi_lock_two()
[access to bdev->bd_inode->i_data.backing_dev_info]
I think Tejun's patch is reasonable.
Thanks,
--
Jun'ichi Nomura, NEC Corporation
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