[RFC PATCH 0/2] introduce io_uring_cmd_import_fixed_vec

[Sidong Yang <sidong.yang@furiosa.ai>]

This patche series introduce io_uring_cmd_import_vec. With this function,
Multiple fixed buffer could be used in uring cmd. It's vectored version
for io_uring_cmd_import_fixed(). Also this patch series includes a usage
for new api for encoded read in btrfs by using uring cmd.

Sidong Yang (2):
  io_uring: cmd: introduce io_uring_cmd_import_fixed_vec
  btrfs: ioctl: use registered buffer for IORING_URING_CMD_FIXED

 fs/btrfs/ioctl.c             | 26 +++++++++++++++++++++-----
 include/linux/io_uring/cmd.h | 14 ++++++++++++++
 io_uring/uring_cmd.c         | 29 +++++++++++++++++++++++++++++
 3 files changed, 64 insertions(+), 5 deletions(-)

---

Recently, I've found that io_import_reg_vec() was added for io-uring. I think
it could be used for io-uring cmd. I've tested for btrfs encoded read and it
works. But it seems that there is no performance improvements and I'll keep
find why.

If there is no need to use fixed buffer for btrfs, I think it's good to use
for nvme.

2.43.0