block: add a disk_openers helper
authorChristoph Hellwig <hch@lst.de>
Wed, 30 Mar 2022 05:29:06 +0000 (07:29 +0200)
committerJens Axboe <axboe@kernel.dk>
Mon, 18 Apr 2022 12:54:09 +0000 (06:54 -0600)
commitdbdc1be32591af023db2812706f01e6cd2f42bfc
treeecdb59b4ebcdc9bb0f1eea5e086aa9ea0e3c733f
parent7a86d6dc1493326feb0d3ce5af2f34401dd3defa
block: add a disk_openers helper

Add a helper that returns the openers for a given gendisk to avoid having
drivers poke into disk->part0 to get at this information in a somewhat
cumbersome way.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20220330052917.2566582-5-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
drivers/block/nbd.c
drivers/block/zram/zram_drv.c
include/linux/blkdev.h