[Qemu-block] [RFC PATCH v2 0/9] Add support for io_uring

[Aarushi Mehta]

This patch series adds support for the newly developed io_uring Linux AIO 
interface. Linux io_uring is faster than Linux's AIO asynchronous I/O code, 
offers efficient buffered asynchronous I/O support, the ability to do I/O 
without performing a system call via polled I/O, and other efficiency 
enhancements. It is expected that it will replace the old AIO interface

Testing it requires a host kernel 5.1 or newer and the liburing library. Use 
the option -drive aio=io_uring to enable it.

v2:
- Fix Patchew errors
- Option now enumerates only for CONFIG_LINUX in qapi
- Removed redudant and broken code in io_uring
- io_uring now aborts on sqe leak

Aarushi Mehta (9):
  qapi/block-core: add option for io_uring
  block/block: add BDRV flag for io_uring
  include/block: declare interfaces for io_uring
  stubs: add aio interface stubs for io_uring
  util/async: add aio interfaces for io_uring
  block/io_uring: implements interfaces for io_uring
  blockdev: accept io_uring as option
  block/file-posix: extends to use with io_uring
  configure: permit use of io_uring

 MAINTAINERS             |  11 ++
 block/Makefile.objs     |   2 +
 block/file-posix.c      |  63 ++++++++-
 block/io_uring.c        | 306 ++++++++++++++++++++++++++++++++++++++++
 blockdev.c              |   4 +-
 configure               |  27 ++++
 include/block/aio.h     |  16 ++-
 include/block/block.h   |   1 +
 include/block/raw-aio.h |  15 ++
 qapi/block-core.json    |   6 +-
 stubs/Makefile.objs     |   1 +
 stubs/io_uring.c        |  32 +++++
 util/async.c            |  36 +++++
 13 files changed, 511 insertions(+), 9 deletions(-)
 create mode 100644 block/io_uring.c
 create mode 100644 stubs/io_uring.c

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2.17.1