[Qemu-block] [PATCH v3 0/8] 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. Testing it requires a host kernel (5.1+) 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

v3:
- Fix major errors in io_uring (sorry)
- Option now enumerates for CONFIG_LINUX_IO_URING
- pkg config support added

Aarushi Mehta (8):
  configure: permit use of io_uring
  qapi/block-core: add option for io_uring
  block/block: add BDRV flag for io_uring
  block/io_uring: implements interfaces for io_uring
  stubs: add stubs for io_uring interface
  util/async: add aio interfaces for io_uring
  blockdev: accept io_uring as option
  block/fileposix: extend to use io_uring

 MAINTAINERS             |   8 ++
 block/Makefile.objs     |   3 +
 block/file-posix.c      |  65 ++++++++-
 block/io_uring.c        | 301 ++++++++++++++++++++++++++++++++++++++++
 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, 506 insertions(+), 9 deletions(-)
 create mode 100644 block/io_uring.c
 create mode 100644 stubs/io_uring.c

-- 
2.17.1