simplify gendisk and request_queue allocation for bio based drivers

[Ulf Hansson]

On Fri, 21 May 2021 at 07:51, Christoph Hellwig <hch at lst.de> wrote:
>
> Hi all,
>
> this series is the first part of cleaning up lifetimes and allocation of
> the gendisk and request_queue structure.  It adds a new interface to
> allocate the disk and queue together for bio based drivers, and a helper
> for cleanup/free them when a driver is unloaded or a device is removed.

May I ask what else you have in the pipe for the next steps?

The reason why I ask is that I am looking into some issues related to
lifecycle problems of gendisk/mmc, typically triggered at SD/MMC card
removal.

>
> Together this removes the need to treat the gendisk and request_queue
> as separate entities for bio based drivers.
>
> Diffstat:
>  arch/m68k/emu/nfblock.c             |   20 +---
>  arch/xtensa/platforms/iss/simdisk.c |   29 +------
>  block/blk-core.c                    |    1
>  block/blk.h                         |    6 -
>  block/genhd.c                       |  149 +++++++++++++++++++-----------------
>  block/partitions/core.c             |   19 ++--
>  drivers/block/brd.c                 |   94 +++++++---------------
>  drivers/block/drbd/drbd_main.c      |   23 +----
>  drivers/block/n64cart.c             |    8 -
>  drivers/block/null_blk/main.c       |   38 ++++-----
>  drivers/block/pktcdvd.c             |   11 --
>  drivers/block/ps3vram.c             |   31 +------
>  drivers/block/rsxx/dev.c            |   39 +++------
>  drivers/block/rsxx/rsxx_priv.h      |    1
>  drivers/block/zram/zram_drv.c       |   19 ----
>  drivers/lightnvm/core.c             |   24 +----
>  drivers/md/bcache/super.c           |   15 ---
>  drivers/md/dm.c                     |   16 +--
>  drivers/md/md.c                     |   25 ++----
>  drivers/memstick/core/ms_block.c    |    1
>  drivers/nvdimm/blk.c                |   27 +-----
>  drivers/nvdimm/btt.c                |   25 +-----
>  drivers/nvdimm/btt.h                |    2
>  drivers/nvdimm/pmem.c               |   17 +---
>  drivers/nvme/host/core.c            |    1
>  drivers/nvme/host/multipath.c       |   46 +++--------
>  drivers/s390/block/dcssblk.c        |   26 +-----
>  drivers/s390/block/xpram.c          |   26 ++----
>  include/linux/blkdev.h              |    1
>  include/linux/genhd.h               |   23 +++++
>  30 files changed, 297 insertions(+), 466 deletions(-)

This looks like a nice cleanup to me.  Feel free to add, for the series:

Reviewed-by: Ulf Hansson <ulf.hansson at linaro.org>

Kind regards
Uffe