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Date: Wed, 6 Nov 2019 00:22:14 +0300
From: Pavel Begunkov <asml.silence@...il.com>
To: Jens Axboe <axboe@...nel.dk>, io-uring@...r.kernel.org,
linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/2] io_uring: Merge io_submit_sqes and io_ring_submit
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@...il.com>
---
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);
+
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) {
--
2.23.0
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