simplify gendisk and request_queue allocation for bio based drivers

From: Christoph Hellwig <hch@lst.de>
To: Jens Axboe <axboe@kernel.dk>,
	Geert Uytterhoeven <geert@linux-m68k.org>,
	Chris Zankel <chris@zankel.net>,
	Max Filippov <jcmvbkbc@gmail.com>,
	Philipp Reisner <philipp.reisner@linbit.com>,
	Lars Ellenberg <lars.ellenberg@linbit.com>,
	Jim Paris <jim@jtan.com>,
	Joshua Morris <josh.h.morris@us.ibm.com>,
	Philip Kelleher <pjk1939@linux.ibm.com>,
	Minchan Kim <minchan@kernel.org>, Nitin Gupta <ngupta@vflare.org>,
	Matias Bjorling <mb@lightnvm.io>, Coly Li <colyli@suse.de>,
	Mike Snitzer <snitzer@redhat.com>, Song Liu <song@kernel.org>,
	Maxim Levitsky <maximlevitsky@gmail.com>,
	Alex Dubov <oakad@yahoo.com>,
	Ulf Hansson <ulf.hansson@linaro.org>,
	Dan Williams <dan.j.williams@intel.com>,
	Vishal Verma <vishal.l.verma@intel.com>,
	Dave Jiang <dave.jiang@intel.com>,
	Heiko Carstens <hca@linux.ibm.com>,
	Vasily Gorbik <gor@linux.ibm.com>,
	Christian Borntraeger <borntraeger@de.ibm.com>
Cc: linux-block@vger.kernel.org, dm-devel@redhat.com,
	linux-m68k@lists.linux-m68k.org, linux-xtensa@linux-xtensa.org,
	drbd-dev@lists.linbit.com,
	linuxppc-dev@lists.ozlabs.org (open list:PS3 PLATFORM SUPPORT),
	linux-bcache@vger.kernel.org, linux-raid@vger.kernel.org,
	linux-mmc@vger.kernel.org, nvdimm@lists.linux.dev,
	linux-nvme@lists.infradead.org, linux-s390@vger.kernel.org
Subject: simplify gendisk and request_queue allocation for bio based drivers
Date: Fri, 21 May 2021 07:50:35 +0200	[thread overview]
Message-ID: <20210521055102.1053529-1-hch@lst.de> (raw)

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.

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(-)