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. v4: - Add error handling - Add trace events - Remove aio submission based code v3: - Fix major errors in io_uring (sorry) - Option now enumerates for CONFIG_LINUX_IO_URING - pkg config support added Aarushi Mehta (9): 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/file-posix.c: extend to use io_uring block: add trace events for io_uring MAINTAINERS | 8 + block/Makefile.objs | 3 + block/file-posix.c | 85 +++++++++-- block/io_uring.c | 325 ++++++++++++++++++++++++++++++++++++++++ block/trace-events | 8 + blockdev.c | 4 +- configure | 27 ++++ include/block/aio.h | 16 +- include/block/block.h | 1 + include/block/raw-aio.h | 12 ++ qapi/block-core.json | 4 +- stubs/Makefile.objs | 1 + stubs/io_uring.c | 32 ++++ util/async.c | 36 +++++ 14 files changed, 543 insertions(+), 19 deletions(-) create mode 100644 block/io_uring.c create mode 100644 stubs/io_uring.c -- 2.17.1
