aio: add missing ops

[Cloudef]

https://github.com/torvalds/linux/blob/master/include/uapi/linux/io_uring.h

TODO:

• writev
• readv
• epoll_ctl
• sync_file_range
• fallocate
• fadvise
• madvise
• openat2
• statx
• splice
• files_update
• tee
• msg_ring
• fsetxattr
• setxattr
• fgetxattr
• getxattr
• uring_cmd
• futex_wait
• futex_wake
• futex_waitv
• fixed_fd_install
• ftruncate
• bind
• listen

Won't be supported:

• write_fixed: buffer rings are better abstraction than fixed buffers
• read_fixed: buffer rings are better abstraction than fixed buffers
• timeout_remove: cancel works with every operation
• poll_remove: cancel works with every operation

TBD:

• read_multishot
• send_zc
• sendmsg_zc

[Cloudef]

futex_ operations are particularly interesting https://mazzo.li/posts/uring-multiplex.html

[vlourme]

As we talk in discussion, I would be interested for send_zc, bind, listen and splice.

[Cloudef]

@vlourme there is bind, listen and splice now. Note that bind and listen require quite recent kernel for io_uring (6.11). send/recv/sendmsg/recvmsg now take flags and you can set MSG_ZEROCOPY that way. splice is currently only implemented for io_uring, and doesn't have posix fallback.

I'm not sure if I want to implement io_uring send_zc / sendmsg_zc because there's better way to do it using buffer rings.

[vlourme]

@Cloudef Thank you! It should be enough for my use case now. I work on 6.13 so that's not a problem for me. I'll keep PoC-ing my project with these new Ops