[PATCHv7,0/6] ublk zero copy support

Message

Keith Busch Feb. 26, 2025, 6:20 p.m. UTC

From: Keith Busch <[e-mail]>

Nothing's changed from intended v6. This just fixes up the directory for
the mailed patch set.

Changes from v5:

  Merged up to latest block for-next tree

  Fixed up the io_uring read/write fixed prep to not set do_import, and
  actually use the issue_flags when importing the buffer node (Pavel,
  Caleb).

  Used unambigious names for the read/write permissions of registered
  kernel vectors, defined them using their symbolic names instead of
  literals, and added a BUILD_BUG_ON to ensure the flags fits in the
  type (Ming, Pavel).

  Limit the io cache size to 64 elements (Pavel).

  Enforce unpriveledged ublk dev can't use zero copy (Ming).

  Various cleanups.

Keith Busch (5):
  io_uring/rw: move fixed buffer import to issue path
  io_uring: add support for kernel registered bvecs
  ublk: zc register/unregister bvec
  io_uring: add abstraction for buf_table rsrc data
  io_uring: cache nodes and mapped buffers

Xinyu Zhang (1):
  nvme: map uring_cmd data even if address is 0

 drivers/block/ublk_drv.c       | 119 +++++++++-----
 drivers/nvme/host/ioctl.c      |   2 +-
 include/linux/io_uring/cmd.h   |   7 +
 include/linux/io_uring_types.h |  24 +--
 include/uapi/linux/ublk_cmd.h  |   4 +
 io_uring/fdinfo.c              |   8 +-
 io_uring/filetable.c           |   2 +-
 io_uring/io_uring.c            |   3 +
 io_uring/nop.c                 |   2 +-
 io_uring/opdef.c               |   4 +-
 io_uring/register.c            |   2 +-
 io_uring/rsrc.c                | 280 ++++++++++++++++++++++++++-------
 io_uring/rsrc.h                |  10 +-
 io_uring/rw.c                  |  39 +++--
 io_uring/rw.h                  |   2 +
 15 files changed, 389 insertions(+), 119 deletions(-)