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It will be used to close a couple of API gaps, but in this series can only tell what request and register opcodes, features and setup flags are available. It'll replace IORING_REGISTER_PROBE but with a much more convenient interface. Patch 3 for API description. Can be tested with: https://github.com/isilence/liburing.git io_uring/query-v2 v2: - Add enter and sqe flags to IO_URING_QUERY_OPCODES - Zero unused parts of user structures (beyond returned hdr.size). - Don't colocate hdr and and query specific info. The header now points to it via query_data. Pavel Begunkov (3): io_uring: add helper for *REGISTER_SEND_MSG_RING io_uring: add macros for avaliable flags io_uring: introduce io_uring querying include/uapi/linux/io_uring.h | 3 + include/uapi/linux/io_uring/query.h | 44 ++++++++++++++ io_uring/Makefile | 2 +- io_uring/io_uring.c | 31 +--------- io_uring/io_uring.h | 56 +++++++++++++++++ io_uring/query.c | 93 +++++++++++++++++++++++++++++ io_uring/query.h | 9 +++ io_uring/register.c | 39 +++++++----- 8 files changed, 234 insertions(+), 43 deletions(-) create mode 100644 include/uapi/linux/io_uring/query.h create mode 100644 io_uring/query.c create mode 100644 io_uring/query.h -- 2.49.0