From: Jens Axboe Date: Tue, 25 Feb 2020 20:25:41 +0000 (-0700) Subject: io_uring: pick up link work on submit reference drop X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=2a44f46781617c5040372b59da33553a02b1f46d;p=linux.git io_uring: pick up link work on submit reference drop If work completes inline, then we should pick up a dependent link item in __io_queue_sqe() as well. If we don't do so, we're forced to go async with that item, which is suboptimal. This also fixes an issue with io_put_req_find_next(), which always looks up the next work item. That should only be done if we're dropping the last reference to the request, to prevent multiple lookups of the same work item. Outside of being a fix, this also enables a good cleanup series for 5.7, where we never have to pass 'nxt' around or into the work handlers. Reviewed-by: Pavel Begunkov Signed-off-by: Jens Axboe --- diff --git a/fs/io_uring.c b/fs/io_uring.c index ffd9bfa84d86a..f79ca494bb562 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -1483,10 +1483,10 @@ static void io_free_req(struct io_kiocb *req) __attribute__((nonnull)) static void io_put_req_find_next(struct io_kiocb *req, struct io_kiocb **nxtptr) { - io_req_find_next(req, nxtptr); - - if (refcount_dec_and_test(&req->refs)) + if (refcount_dec_and_test(&req->refs)) { + io_req_find_next(req, nxtptr); __io_free_req(req); + } } static void io_put_req(struct io_kiocb *req) @@ -4749,7 +4749,7 @@ punt: err: /* drop submission reference */ - io_put_req(req); + io_put_req_find_next(req, &nxt); if (linked_timeout) { if (!ret)