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io_uring: optimise use of ctx->drain_next

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Move setting ctx->drain_next to the only place it could be set, when it
got linked non-head requests. The same for checking it, it's interesting
only for a head of a link or a non-linked request.

No functional changes here. This removes some code from the common path
and also removes REQ_F_DRAIN_LINK flag, as it doesn't need it anymore.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2020-01-17 03:57:59 +03:00 committed by Jens Axboe
parent 66f4af93da
commit 711be0312d
1 changed files with 21 additions and 20 deletions
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41
fs/io_uring.c
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@ -506,7 +506,6 @@ struct io_kiocb {
#define REQ_F_LINK 64 /* linked sqes */
#define REQ_F_LINK_TIMEOUT 128 /* has linked timeout */
#define REQ_F_FAIL_LINK 256 /* fail rest of links */
#define REQ_F_DRAIN_LINK 512 /* link should be fully drained */
#define REQ_F_TIMEOUT 1024 /* timeout request */
#define REQ_F_ISREG 2048 /* regular file */
#define REQ_F_MUST_PUNT 4096 /* must be punted even for NONBLOCK */
@ -4558,12 +4557,6 @@ static void io_queue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
int ret;
if (unlikely(req->ctx->drain_next)) {
req->flags |= REQ_F_IO_DRAIN;
req->ctx->drain_next = 0;
}
req->ctx->drain_next = (req->flags & REQ_F_DRAIN_LINK) != 0;
ret = io_req_defer(req, sqe);
if (ret) {
if (ret != -EIOCBQUEUED) {
@ -4630,8 +4623,10 @@ err_req:
if (*link) {
struct io_kiocb *head = *link;
if (sqe_flags & IOSQE_IO_DRAIN)
head->flags |= REQ_F_DRAIN_LINK | REQ_F_IO_DRAIN;
if (sqe_flags & IOSQE_IO_DRAIN) {
head->flags |= REQ_F_IO_DRAIN;
ctx->drain_next = 1;
}
if (sqe_flags & IOSQE_IO_HARDLINK)
req->flags |= REQ_F_HARDLINK;
@ -4655,18 +4650,24 @@ err_req:
io_queue_link_head(head);
*link = NULL;
}
} else if (sqe_flags & (IOSQE_IO_LINK|IOSQE_IO_HARDLINK)) {
req->flags |= REQ_F_LINK;
if (sqe_flags & IOSQE_IO_HARDLINK)
req->flags |= REQ_F_HARDLINK;
INIT_LIST_HEAD(&req->link_list);
ret = io_req_defer_prep(req, sqe);
if (ret)
req->flags |= REQ_F_FAIL_LINK;
*link = req;
} else {
io_queue_sqe(req, sqe);
if (unlikely(ctx->drain_next)) {
req->flags |= REQ_F_IO_DRAIN;
req->ctx->drain_next = 0;
}
if (sqe_flags & (IOSQE_IO_LINK|IOSQE_IO_HARDLINK)) {
req->flags |= REQ_F_LINK;
if (sqe_flags & IOSQE_IO_HARDLINK)
req->flags |= REQ_F_HARDLINK;
INIT_LIST_HEAD(&req->link_list);
ret = io_req_defer_prep(req, sqe);
if (ret)
req->flags |= REQ_F_FAIL_LINK;
*link = req;
} else {
io_queue_sqe(req, sqe);
}
}
return true;