[dm-devel] store a pointer to the block_device in struct bio (again)

[Tejun Heo]

On Tue, Dec 01, 2020 at 05:54:15PM +0100, Christoph Hellwig wrote:
> Hi Jens,
> 
> this series switches back from storing the gendisk + partno to storing
> a block_device pointer in struct bio.  The reason is two fold:  for one
> the new struct block_device actually is always available, removing the
> need to avoid originally.  Second the merge struct block_device is much
> more useful than the old one, as storing it avoids the need for looking
> up what used to be hd_struct during partition remapping and I/O
> accounting.
> 
> Note that this series depends on the posted but not merged
> "block tracepoint cleanups" series.

I'm late but everything looks good to me. So much better than the mess we
had before. Thank you.

The only thing I noticed is that blkdev_get_no_open() can now use
kobject_get() instead of kobject_get_unless_zero() as bdev lookup is
synchronously disabled before device_del().

-- 
tejun