[PATCH v2 0/5] io_uring: extend bvec registration and add mem region lookup

[Joanne Koong <joannelkoong@gmail.com>]

This series refactors and extends the io_uring registered buffers
infrastructure to allow external subsystems to register pre-existing bvec
arrays directly and obtain a pointer to the registered memory region.

The motivation for the patches in this series is to make fuse zero-copy
possible.

These patches are split out from a previous larger fuse-over-io_uring series
[1]. The remaining fuse patches will be submitted separately and linked to.

Thanks,
Joanne

[1] https://lore.kernel.org/linux-fsdevel/20260116233044.1532965-1-joannelkoong@gmail.com/

Changelog:
v1: https://lore.kernel.org/io-uring/20260324001007.1144471-1-joannelkoong@gmail.com/
v1 -> v2:
* update io_kernel_buffer_init() to take bitmasked dir directly so callers can
  set both dest and source

Joanne Koong (5):
  io_uring/rsrc: rename
    io_buffer_register_bvec()/io_buffer_unregister_bvec()
  io_uring/rsrc: split io_buffer_register_request() logic
  io_uring/rsrc: allow buffer release callback to be optional
  io_uring/rsrc: add io_buffer_register_bvec()
  io_uring/rsrc: add io_uring_registered_mem_region_get()

 Documentation/block/ublk.rst |  14 ++--
 drivers/block/ublk_drv.c     |  22 +++---
 include/linux/io_uring/cmd.h |  47 ++++++++++--
 io_uring/rsrc.c              | 143 ++++++++++++++++++++++++++---------
 4 files changed, 165 insertions(+), 61 deletions(-)

-- 
2.52.0