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

[Tejun Heo]

On Wed, Dec 02, 2020 at 05:35:21PM -0500, Tejun Heo wrote:
> 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().

Oops, sorry, this was supposed to be a reply to the earlier hd_struct
removal patchset. Reviewing this patchset now.

Thanks.

-- 
tejun