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

[Ming Lei]

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.


Thanks,
Ming