io_uring: rework io_uring_enter to simplify return value
io_uring_enter returns the count submitted preferrably over an error code. In some code paths this check is not required, so reorganise the code so that the check is only done as needed. This is also a prep for returning error codes only in waiting scenarios. Signed-off-by: Dylan Yudaken <dylany@fb.com> Link: https://lore.kernel.org/r/20220421091345.2115755-4-dylany@fb.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
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08dcd0288f
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3e813c9026
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@ -10872,7 +10872,6 @@ SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit,
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size_t, argsz)
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{
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struct io_ring_ctx *ctx;
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int submitted = 0;
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struct fd f;
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long ret;
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@ -10935,15 +10934,15 @@ SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit,
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if (ret)
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goto out;
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}
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submitted = to_submit;
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ret = to_submit;
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} else if (to_submit) {
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ret = io_uring_add_tctx_node(ctx);
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if (unlikely(ret))
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goto out;
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mutex_lock(&ctx->uring_lock);
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submitted = io_submit_sqes(ctx, to_submit);
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if (submitted != to_submit) {
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ret = io_submit_sqes(ctx, to_submit);
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if (ret != to_submit) {
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mutex_unlock(&ctx->uring_lock);
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goto out;
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}
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@ -10952,6 +10951,7 @@ SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit,
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mutex_unlock(&ctx->uring_lock);
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}
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if (flags & IORING_ENTER_GETEVENTS) {
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int ret2;
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if (ctx->syscall_iopoll) {
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/*
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* We disallow the app entering submit/complete with
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@ -10961,22 +10961,29 @@ SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit,
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*/
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mutex_lock(&ctx->uring_lock);
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iopoll_locked:
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ret = io_validate_ext_arg(flags, argp, argsz);
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if (likely(!ret)) {
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min_complete = min(min_complete, ctx->cq_entries);
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ret = io_iopoll_check(ctx, min_complete);
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ret2 = io_validate_ext_arg(flags, argp, argsz);
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if (likely(!ret2)) {
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min_complete = min(min_complete,
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ctx->cq_entries);
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ret2 = io_iopoll_check(ctx, min_complete);
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}
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mutex_unlock(&ctx->uring_lock);
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} else {
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const sigset_t __user *sig;
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struct __kernel_timespec __user *ts;
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ret = io_get_ext_arg(flags, argp, &argsz, &ts, &sig);
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if (unlikely(ret))
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goto out;
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min_complete = min(min_complete, ctx->cq_entries);
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ret = io_cqring_wait(ctx, min_complete, sig, argsz, ts);
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ret2 = io_get_ext_arg(flags, argp, &argsz, &ts, &sig);
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if (likely(!ret2)) {
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min_complete = min(min_complete,
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ctx->cq_entries);
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ret2 = io_cqring_wait(ctx, min_complete, sig,
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argsz, ts);
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}
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}
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if (!ret)
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ret = ret2;
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}
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out:
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@ -10984,7 +10991,7 @@ out:
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out_fput:
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if (!(flags & IORING_ENTER_REGISTERED_RING))
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fdput(f);
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return submitted ? submitted : ret;
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return ret;
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}
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#ifdef CONFIG_PROC_FS
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