[PATCH v2 0/4] Add invalidate_disk() helper for drivers to invalidate the gendisk

[Xie Yongji <xieyongji@bytedance.com>]

This series comes from Christoph Hellwig's suggestion [1]. Some block
device drivers such as loop driver and nbd driver need to invalidate
the gendisk when the backend is detached so that the gendisk can be
reused by the new backend. Now the invalidation is done in device
driver with their own ways. To avoid code duplication and hide
some internals of the implementation, this series adds a block layer
helper and makes both loop driver and nbd driver use it.

[1] [🔎] YTmqJHd7YWAQ2lZ7@infradead.org/">https://lore.kernel.org/all/[🔎] YTmqJHd7YWAQ2lZ7@infradead.org/

V1 to V2:
- Rename invalidate_gendisk() to invalidate_disk()
- Add a cleanup patch to remove bdev checks and bdev variable in __loop_clr_fd()

Xie Yongji (4):
  block: Add invalidate_disk() helper to invalidate the gendisk
  loop: Use invalidate_disk() helper to invalidate gendisk
  loop: Remove the unnecessary bdev checks and unused bdev variable
  nbd: Use invalidate_disk() helper on disconnect

 block/genhd.c         | 20 ++++++++++++++++++++
 drivers/block/loop.c  | 15 ++++-----------
 drivers/block/nbd.c   | 12 +++---------
 include/linux/genhd.h |  2 ++
 4 files changed, 29 insertions(+), 20 deletions(-)

-- 
2.11.0