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io_uring: don't arm a timeout through work.func 

Remove io_link_work_cb() -- the last custom work.func.
Not the prettiest thing, but works. Instead of queueing a linked timeout
in io_link_work_cb() mark a request with REQ_F_QUEUE_TIMEOUT and do
enqueueing based on the flag in io_wq_submit_work().

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2020-06-08 21:08:19 +03:00 committed by Jens Axboe
parent ac45abc0e2
commit d4c81f3852
1 changed files with 18 additions and 11 deletions
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29
fs/io_uring.c
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@ -541,6 +541,7 @@ enum {
REQ_F_POLLED_BIT,
REQ_F_BUFFER_SELECTED_BIT,
REQ_F_NO_FILE_TABLE_BIT,
REQ_F_QUEUE_TIMEOUT_BIT,
/* not a real bit, just to check we're not overflowing the space */
__REQ_F_LAST_BIT,
@ -596,6 +597,8 @@ enum {
REQ_F_BUFFER_SELECTED = BIT(REQ_F_BUFFER_SELECTED_BIT),
/* doesn't need file table for this request */
REQ_F_NO_FILE_TABLE = BIT(REQ_F_NO_FILE_TABLE_BIT),
/* needs to queue linked timeout */
REQ_F_QUEUE_TIMEOUT = BIT(REQ_F_QUEUE_TIMEOUT_BIT),
};
struct async_poll {
@ -1580,16 +1583,6 @@ static void io_free_req(struct io_kiocb *req)
io_queue_async_work(nxt);
}
static void io_link_work_cb(struct io_wq_work **workptr)
{
struct io_kiocb *req = container_of(*workptr, struct io_kiocb, work);
struct io_kiocb *link;
link = list_first_entry(&req->link_list, struct io_kiocb, link_list);
io_queue_linked_timeout(link);
io_wq_submit_work(workptr);
}
static void io_wq_assign_next(struct io_wq_work **workptr, struct io_kiocb *nxt)
{
struct io_kiocb *link;
@ -1601,7 +1594,7 @@ static void io_wq_assign_next(struct io_wq_work **workptr, struct io_kiocb *nxt)
*workptr = &nxt->work;
link = io_prep_linked_timeout(nxt);
if (link)
nxt->work.func = io_link_work_cb;
nxt->flags |= REQ_F_QUEUE_TIMEOUT;
}
/*
@ -5291,12 +5284,26 @@ static int io_issue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe,
return 0;
}
static void io_arm_async_linked_timeout(struct io_kiocb *req)
{
struct io_kiocb *link;
/* link head's timeout is queued in io_queue_async_work() */
if (!(req->flags & REQ_F_QUEUE_TIMEOUT))
return;
link = list_first_entry(&req->link_list, struct io_kiocb, link_list);
io_queue_linked_timeout(link);
}
static void io_wq_submit_work(struct io_wq_work **workptr)
{
struct io_wq_work *work = *workptr;
struct io_kiocb *req = container_of(work, struct io_kiocb, work);
int ret = 0;
io_arm_async_linked_timeout(req);
/* if NO_CANCEL is set, we must still run the work */
if ((work->flags & (IO_WQ_WORK_CANCEL|IO_WQ_WORK_NO_CANCEL)) ==
IO_WQ_WORK_CANCEL) {