Here's v2 of the io_uring interface. See the v1 posting for some more info: https://lore.kernel.org/linux-block/20190108165645.19311-1-axboe@xxxxxxxxx/ The data structures changed, to improve the symmetry of the submission and completion side. The io_uring_iocb is now io_uring_sqe, but it otherwise remains the same as before. Ditto on the completion side, where io_uring_event is now io_uring_cqe. I've updated the fio io_uring test app, and the io_uring engine. The liburing git repo has also been adapted to the various changes since the v1 posting. As a reminder, the liburing git repo contains some helpers for doing IO without having to muck with the ring directly, setting up an io_uring context, etc. Clone that here: git://git.kernel.dk/liburing In terms of usage, there's also a small test app here: http://git.kernel.dk/cgit/fio/plain/t/io_uring.c and the liburing repo has a few test apps in test/ as well. Patches are aginst 5.0-rc1, but can also be found here: git://git.kernel.dk/linux-block io_uring Changes since v1: - Fail IORING_OP_{READ,WRITE}_FIXED if not configured - Fix ctx drop ref issue on failure to close ring_fd when sq thread/wq are in use - Move to separate Kconfig entry (CONFIG_IO_URING) - Add SPDX headers - Drop gcc ism of zero sized arrays - Rename io_uring_iocb -> io_uring_sqe - Rename io_uring_event -> io_uring_cqe - Drop needless io_event_ring and io_iocb_ring structures - Drop ctx->max_reqs, use ->sq_entries - Drop unused ->ring_lock - Drop io_ring_ctx slab cache - Fix state batched kiocb alloc failure to put ctx - Fix missing write ordering barrier when filling in the cqe - Drop io_req_init() - Various renames - Fix a few lines that were too long - Address other minor review comments - Fix IORING_SETUP_SQPOLL being set without IORING_SETUP_SQTHREAD - Drop IORING_SETUP_FIXEDBUFS, iovecs being non-NULL is enough - Fix error handling free of ctx in setup path - Change standard read/write commands to be iov based READV/WRITEV - Pass in struct sqe_submit instead of separate sqe/index everywhere - Fix reap of polled events on fops->release() - Lock uring for sq thread polling - Don't grab ->completion_lock for polled IO cqe filling - Fix ev_flags vs flags typo - Consolidate parts of the io_ring_ctx alignment Documentation/filesystems/vfs.txt | 3 + arch/x86/entry/syscalls/syscall_64.tbl | 2 + block/bio.c | 59 +- fs/Makefile | 1 + fs/block_dev.c | 19 +- fs/file.c | 15 +- fs/file_table.c | 9 +- fs/gfs2/file.c | 2 + fs/io_uring.c | 1890 ++++++++++++++++++++++++ fs/iomap.c | 48 +- fs/xfs/xfs_file.c | 1 + include/linux/bio.h | 14 + include/linux/blk_types.h | 1 + include/linux/file.h | 2 + include/linux/fs.h | 6 +- include/linux/iomap.h | 1 + include/linux/syscalls.h | 5 + include/uapi/linux/io_uring.h | 114 ++ init/Kconfig | 8 + kernel/sys_ni.c | 2 + 20 files changed, 2163 insertions(+), 39 deletions(-) -- Jens Axboe
