[dm-devel] [PATCH 3/9] block: store a block_device pointer in struct bio

[Ming Lei]

On Thu, Dec 03, 2020 at 02:40:04PM +0800, Ming Lei wrote:
> On Tue, Dec 01, 2020 at 05:54:18PM +0100, Christoph Hellwig wrote:
> > Replace the gendisk pointer in struct bio with a pointer to the newly
> > improved struct block device.  From that the gendisk can be trivially
> > accessed with an extra indirection, but it also allows to directly
> > look up all information related to partition remapping.
> 
> The extra indirection is often done in fast path, so just wondering why
> you don't consider to embed gendisk into block_device? Then the extra
> indirection can be avoided.

oops, that is only possible for disk, and indirection is still needed
for partitions.


Thanks,
Ming