[PATCHSET for-next 0/2] Deduplicate fd-to-ctx conversions

[Jens Axboe <axboe@kernel.dk>]

Hi,

io_uring_register_get_file() exists to return a file associated with
a struct io_ring_ctx, dealing with both registered ring descriptors
and with normal file descriptors. There are a few users of this, but
the main io_uring_enter(2) syscall handrolls its own.

Deduplicate that by avoiding the fget/fput for the registered ring
descriptor, as that cannot go away since it's private to the task
doing the operation. Unify how the file is put because of that, and
then we can convert io_uring_enter(2) to use this helper too and move
it closer to the hot path of the actual syscall. Then we only have a
single way of doing the ctx retrieval, rather than two separate ones.

 io_uring/bpf-ops.c  |  2 +-
 io_uring/io_uring.c | 57 ++++++++++++++++++++++++++++-----------------
 io_uring/io_uring.h |  1 +
 io_uring/register.c | 39 +++----------------------------
 io_uring/register.h |  1 -
 io_uring/rsrc.c     |  5 ++--
 6 files changed, 44 insertions(+), 61 deletions(-)

-- 
Jens Axboe