From 0ffae640ad83de46865c6b8dc3fda370823e4f1d Mon Sep 17 00:00:00 2001 From: Dylan Yudaken Date: Fri, 27 Jan 2023 05:52:27 -0800 Subject: io_uring: always go async for unsupported open flags No point in issuing -> return -EAGAIN -> go async, when it can be done upfront. Signed-off-by: Dylan Yudaken Link: https://lore.kernel.org/r/20230127135227.3646353-5-dylany@meta.com Signed-off-by: Jens Axboe --- io_uring/openclose.c | 18 ++++++++++++------ 1 file changed, 12 insertions(+), 6 deletions(-) (limited to 'io_uring/openclose.c') diff --git a/io_uring/openclose.c b/io_uring/openclose.c index 67178e4bb282..a1b98c81a52d 100644 --- a/io_uring/openclose.c +++ b/io_uring/openclose.c @@ -31,6 +31,15 @@ struct io_close { u32 file_slot; }; +static bool io_openat_force_async(struct io_open *open) +{ + /* + * Don't bother trying for O_TRUNC, O_CREAT, or O_TMPFILE open, + * it'll always -EAGAIN + */ + return open->how.flags & (O_TRUNC | O_CREAT | O_TMPFILE); +} + static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) { struct io_open *open = io_kiocb_to_cmd(req, struct io_open); @@ -61,6 +70,8 @@ static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe open->nofile = rlimit(RLIMIT_NOFILE); req->flags |= REQ_F_NEED_CLEANUP; + if (io_openat_force_async(open)) + req->flags |= REQ_F_FORCE_ASYNC; return 0; } @@ -108,12 +119,7 @@ int io_openat2(struct io_kiocb *req, unsigned int issue_flags) nonblock_set = op.open_flag & O_NONBLOCK; resolve_nonblock = open->how.resolve & RESOLVE_CACHED; if (issue_flags & IO_URING_F_NONBLOCK) { - /* - * Don't bother trying for O_TRUNC, O_CREAT, or O_TMPFILE open, - * it'll always -EAGAIN - */ - if (open->how.flags & (O_TRUNC | O_CREAT | O_TMPFILE)) - return -EAGAIN; + WARN_ON_ONCE(io_openat_force_async(open)); op.lookup_flags |= LOOKUP_CACHED; op.open_flag |= O_NONBLOCK; } -- cgit v1.2.3-58-ga151