[RFC v2 00/12] dynamic buffers + rsrc tagging

[Pavel Begunkov <asml.silence@gmail.com>]

1) support dynamic managment for registered buffers, including
update.

2) add new IORING_REGISTER* for rsrc register and rsrc update,
which are just dispatch files/buffers to right callbacks. Needed
because old ones not nicely extendible. The downside --
restrictions not supporting it with fine granularity.

3) add rsrc tagging, with tag=0 ingnoring CQE posting.
Doesn't post CQEs on unregister, but can easily be changed

v2: instead of async_data importing for fixed rw, save
    used io_mapped_ubuf and use it on re-import.
    Add patch 9/12 as a preparation for that.

    Fix prep rw getting a rsrc node ref for fixed files without
    having a rsrc node.

Bijan Mottahedeh (1):
  io_uring: implement fixed buffers registration similar to fixed files

Pavel Begunkov (11):
  io_uring: move __io_sqe_files_unregister
  io_uring: return back rsrc data free helper
  io_uring: decouple CQE filling from requests
  io_uring: preparation for rsrc tagging
  io_uring: add generic path for rsrc update
  io_uring: enumerate dynamic resources
  io_uring: add IORING_REGISTER_RSRC
  io_uring: add generic rsrc update with tags
  io_uring: keep table of pointers to ubufs
  io_uring: prepare fixed rw for dynanic buffers
  io_uring: add full-fledged dynamic buffers support

 fs/io_uring.c                 | 523 +++++++++++++++++++++++++---------
 include/uapi/linux/io_uring.h |  23 ++
 2 files changed, 405 insertions(+), 141 deletions(-)

-- 
2.31.1