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io_uring: simplify __io_queue_sqe() 

Restructure __io_queue_sqe() so it follows simple if/else if/else
control flow. It's more readable and removes extra goto/labels.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2020-10-22 16:47:18 +01:00 committed by Jens Axboe
parent 9aaf354352
commit 0d63c148d6
1 changed files with 11 additions and 17 deletions
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28
fs/io_uring.c
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@ -6162,7 +6162,6 @@ static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req)
static void __io_queue_sqe(struct io_kiocb *req, struct io_comp_state *cs)
{
struct io_kiocb *linked_timeout;
struct io_kiocb *nxt;
const struct cred *old_creds = NULL;
int ret;
@ -6197,30 +6196,25 @@ again:
if (linked_timeout)
io_queue_linked_timeout(linked_timeout);
goto exit;
}
} else if (likely(!ret)) {
/* drop submission reference */
req = io_put_req_find_next(req);
if (linked_timeout)
io_queue_linked_timeout(linked_timeout);
if (unlikely(ret)) {
if (req) {
if (!(req->flags & REQ_F_FORCE_ASYNC))
goto again;
io_queue_async_work(req);
}
} else {
/* un-prep timeout, so it'll be killed as any other linked */
req->flags &= ~REQ_F_LINK_TIMEOUT;
req_set_fail_links(req);
io_put_req(req);
io_req_complete(req, ret);
goto exit;
}
/* drop submission reference */
nxt = io_put_req_find_next(req);
if (linked_timeout)
io_queue_linked_timeout(linked_timeout);
if (nxt) {
req = nxt;
if (!(req->flags & REQ_F_FORCE_ASYNC))
goto again;
io_queue_async_work(req);
}
exit:
if (old_creds)
revert_creds(old_creds);
}