Apply fixed_rsrc functionality for fixed buffers support.
Signed-off-by: NBijan Mottahedeh <bijan.mottahedeh@oracle.com>
[rebase, remove multi-level tables, fix unregister on exit]
Signed-off-by: NPavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/17035f4f75319dc92962fce4fc04bc0afb5a68dc.1619356238.git.asml.silence@gmail.comSigned-off-by: NJens Axboe <axboe@kernel.dk>