Re: simplify gendisk lookup and remove struct block_device aliases v4

Jens Axboe
2020-11-11T16:18:08Z

On 10/29/20 8:58 AM, Christoph Hellwig wrote:
> Hi all,
>
> this series removes the annoying struct block_device aliases, which can
> happen for a bunch of old floppy drivers (and z2ram). In that case
> multiple struct block device instances for different dev_t's can point
> to the same gendisk, without being partitions. The cause for that
> is the probe/get callback registered through blk_register_regions.
>
> This series removes blk_register_region entirely, splitting it it into
> a simple xarray lookup of registered gendisks, and a probe callback
> stored in the major_names array that can be used for modprobe overrides
> or creating devices on demands when no gendisk is found. The old
> remapping is gone entirely, and instead the 4 remaining drivers just
> register a gendisk for each operating mode. In case of the two drivers
> that have lots of aliases that is done on-demand using the new probe
> callback, while for the other two I simply register all at probe time
> to keep things simple.
>
> Note that the m68k drivers are compile tested only.

Applied, thanks.

--
Jens Axboe