On 11/6/19 5:22 AM, Pavel Begunkov wrote:
> io_submit_sqes() and io_ring_submit() are doing the same stuff with
> a little difference. Deduplicate them.
>
> Signed-off-by: Pavel Begunkov <asml.silence@xxxxxxxxx>
> ---
> fs/io_uring.c | 88 +++++++++++----------------------------------------
> 1 file changed, 18 insertions(+), 70 deletions(-)
>
> diff --git a/fs/io_uring.c b/fs/io_uring.c
> index 7813bc7d5b61..ebe2a4edd644 100644
> --- a/fs/io_uring.c
> +++ b/fs/io_uring.c
> @@ -2681,7 +2681,8 @@ static bool io_get_sqring(struct io_ring_ctx *ctx, struct sqe_submit *s)
> }
>
> static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr,
> - struct mm_struct **mm)
> + struct file *ring_file, int ring_fd,
> + struct mm_struct **mm, bool async)
> {
> struct io_submit_state state, *statep = NULL;
> struct io_kiocb *link = NULL;
> @@ -2732,10 +2733,12 @@ static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr,
> }
>
> out:
> + s.ring_file = ring_file;
> + s.ring_fd = ring_fd;
> s.has_user = *mm != NULL;
> - s.in_async = true;
> - s.needs_fixed_file = true;
> - trace_io_uring_submit_sqe(ctx, s.sqe->user_data, true, true);
> + s.in_async = async;
> + s.needs_fixed_file = async;
> + trace_io_uring_submit_sqe(ctx, s.sqe->user_data, true, async);
> io_submit_sqe(ctx, &s, statep, &link);
> submitted++;
> }
> @@ -2745,6 +2748,9 @@ static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr,
> if (statep)
> io_submit_state_end(&state);
>
> + /* Commit SQ ring head once we've consumed and submitted all SQEs */
> + io_commit_sqring(ctx);
> +
Then don't need io_commit_sqring() in io_sq_thread any more?
Anyway, looks good to me.
Reviewed-by: Bob Liu <bob.liu@xxxxxxxxxx>
> return submitted;
> }
>
> @@ -2849,7 +2855,8 @@ static int io_sq_thread(void *data)
> }
>
> to_submit = min(to_submit, ctx->sq_entries);
> - inflight += io_submit_sqes(ctx, to_submit, &cur_mm);
> + inflight += io_submit_sqes(ctx, to_submit, NULL, -1, &cur_mm,
> + true);
>
> /* Commit SQ ring head once we've consumed all SQEs */
> io_commit_sqring(ctx);
> @@ -2866,69 +2873,6 @@ static int io_sq_thread(void *data)
> return 0;
> }
>
> -static int io_ring_submit(struct io_ring_ctx *ctx, unsigned int to_submit,
> - struct file *ring_file, int ring_fd)
> -{
> - struct io_submit_state state, *statep = NULL;
> - struct io_kiocb *link = NULL;
> - struct io_kiocb *shadow_req = NULL;
> - bool prev_was_link = false;
> - int i, submit = 0;
> -
> - if (to_submit > IO_PLUG_THRESHOLD) {
> - io_submit_state_start(&state, ctx, to_submit);
> - statep = &state;
> - }
> -
> - for (i = 0; i < to_submit; i++) {
> - struct sqe_submit s;
> -
> - if (!io_get_sqring(ctx, &s))
> - break;
> -
> - /*
> - * If previous wasn't linked and we have a linked command,
> - * that's the end of the chain. Submit the previous link.
> - */
> - if (!prev_was_link && link) {
> - io_queue_link_head(ctx, link, &link->submit, shadow_req);
> - link = NULL;
> - shadow_req = NULL;
> - }
> - prev_was_link = (s.sqe->flags & IOSQE_IO_LINK) != 0;
> -
> - if (link && (s.sqe->flags & IOSQE_IO_DRAIN)) {
> - if (!shadow_req) {
> - shadow_req = io_get_req(ctx, NULL);
> - if (unlikely(!shadow_req))
> - goto out;
> - shadow_req->flags |= (REQ_F_IO_DRAIN | REQ_F_SHADOW_DRAIN);
> - refcount_dec(&shadow_req->refs);
> - }
> - shadow_req->sequence = s.sequence;
> - }
> -
> -out:
> - s.ring_file = ring_file;
> - s.has_user = true;
> - s.in_async = false;
> - s.needs_fixed_file = false;
> - s.ring_fd = ring_fd;
> - submit++;
> - trace_io_uring_submit_sqe(ctx, s.sqe->user_data, true, false);
> - io_submit_sqe(ctx, &s, statep, &link);
> - }
> -
> - if (link)
> - io_queue_link_head(ctx, link, &link->submit, shadow_req);
> - if (statep)
> - io_submit_state_end(statep);
> -
> - io_commit_sqring(ctx);
> -
> - return submit;
> -}
> -
> struct io_wait_queue {
> struct wait_queue_entry wq;
> struct io_ring_ctx *ctx;
> @@ -4049,10 +3993,14 @@ SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit,
> wake_up(&ctx->sqo_wait);
> submitted = to_submit;
> } else if (to_submit) {
> - to_submit = min(to_submit, ctx->sq_entries);
> + struct mm_struct *cur_mm;
>
> + to_submit = min(to_submit, ctx->sq_entries);
> mutex_lock(&ctx->uring_lock);
> - submitted = io_ring_submit(ctx, to_submit, f.file, fd);
> + /* already have mm, so io_submit_sqes() won't try to grab it */
> + cur_mm = ctx->sqo_mm;
> + submitted = io_submit_sqes(ctx, to_submit, f.file, fd,
> + &cur_mm, false);
> mutex_unlock(&ctx->uring_lock);
> }
> if (flags & IORING_ENTER_GETEVENTS) {
>
