[PATCHv2 0/4] block integrity: directly map user space addresses

[Keith Busch <kbusch@meta.com>]

From: Keith Busch <kbusch@kernel.org>

Handling passthrough metadata ("integrity") today introduces overhead
and complications that we can avoid if we just map user space addresses
directly. This patch series implements that, falling back to a kernel
bounce buffer if necessary.

v1->v2:

  Bounce to a kernel buffer if the user buffer fails to map to the
  device's integrity constraints. The user address remains pinned for
  the duration of the IO, which makes the copy out on completion safe
  within interrupt context.

  Merged up to current io_uring branch, which moved the driver owned
  flags to a different file.

Keith Busch (4):
  block: bio-integrity: directly map user buffers
  nvme: use bio_integrity_map_user
  iouring: remove IORING_URING_CMD_POLLED
  io_uring: remove uring_cmd cookie

 block/bio-integrity.c     | 202 ++++++++++++++++++++++++++++++++++++++
 drivers/nvme/host/ioctl.c | 174 +++++---------------------------
 include/linux/bio.h       |   9 ++
 include/linux/io_uring.h  |   9 +-
 io_uring/uring_cmd.c      |   1 -
 5 files changed, 240 insertions(+), 155 deletions(-)

-- 
2.34.1