Merge branch 'block-6.15' into for-6.16/block

Merge branch 'block-6.15' into for-6.16/block

Merge 6.15 block fixes - both to get the fixes causing issues with
XFS testing, but also to make it easier for 6.16 ublk patches to avoid
conflicts.

* block-6.15:
  ublk: fix race between io_uring_cmd_complete_in_task and ublk_cancel_cmd
  ublk: call ublk_dispatch_req() for handling UBLK_U_IO_NEED_GET_DATA
  block: don't autoload drivers on blk-cgroup configuration
  block: don't autoload drivers on stat
  block: remove the backing_inode variable in bdev_statx
  block: move blkdev_{get,put} _no_open prototypes out of blkdev.h
  block: never reduce ra_pages in blk_apply_bdi_limits
  selftests: ublk: common: fix _get_disk_dev_t for pre-9.0 coreutils
  selftests: ublk: remove useless 'delay_us' from 'struct dev_ctx'
  selftests: ublk: fix recover test
  block: hoist block size validation code to a separate function
  block: fix race between set_blocksize and read paths
  nvmet: fix out-of-bounds access in nvmet_enable_port