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io_uring: use new io_req_task_work_add() helper throughout 

Since we now have that in the 5.9 branch, convert the existing users of
task_work_add() to use this new helper.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2020-07-01 15:37:11 -06:00
parent 4c6e277c4c
commit c2c4c83c58
1 changed files with 37 additions and 40 deletions
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77
fs/io_uring.c
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@ -1689,6 +1689,29 @@ static struct io_kiocb *io_req_find_next(struct io_kiocb *req)
return __io_req_find_next(req);
}
static int io_req_task_work_add(struct io_kiocb *req, struct callback_head *cb)
{
struct task_struct *tsk = req->task;
struct io_ring_ctx *ctx = req->ctx;
int ret, notify = TWA_RESUME;
/*
* SQPOLL kernel thread doesn't need notification, just a wakeup.
* If we're not using an eventfd, then TWA_RESUME is always fine,
* as we won't have dependencies between request completions for
* other kernel wait conditions.
*/
if (ctx->flags & IORING_SETUP_SQPOLL)
notify = 0;
else if (ctx->cq_ev_fd)
notify = TWA_SIGNAL;
ret = task_work_add(tsk, cb, notify);
if (!ret)
wake_up_process(tsk);
return ret;
}
static void __io_req_task_cancel(struct io_kiocb *req, int error)
{
struct io_ring_ctx *ctx = req->ctx;
@ -1732,18 +1755,19 @@ static void io_req_task_submit(struct callback_head *cb)
static void io_req_task_queue(struct io_kiocb *req)
{
struct task_struct *tsk = req->task;
int ret;
init_task_work(&req->task_work, io_req_task_submit);
ret = task_work_add(tsk, &req->task_work, true);
ret = io_req_task_work_add(req, &req->task_work);
if (unlikely(ret)) {
struct task_struct *tsk;
init_task_work(&req->task_work, io_req_task_cancel);
tsk = io_wq_get_task(req->ctx->io_wq);
task_work_add(tsk, &req->task_work, true);
task_work_add(tsk, &req->task_work, 0);
wake_up_process(tsk);
}
wake_up_process(tsk);
}
static void io_queue_next(struct io_kiocb *req)
@ -2197,19 +2221,15 @@ static void io_rw_resubmit(struct callback_head *cb)
static bool io_rw_reissue(struct io_kiocb *req, long res)
{
#ifdef CONFIG_BLOCK
struct task_struct *tsk;
int ret;
if ((res != -EAGAIN && res != -EOPNOTSUPP) || io_wq_current_is_worker())
return false;
tsk = req->task;
init_task_work(&req->task_work, io_rw_resubmit);
ret = task_work_add(tsk, &req->task_work, true);
if (!ret) {
wake_up_process(tsk);
ret = io_req_task_work_add(req, &req->task_work);
if (!ret)
return true;
}
#endif
return false;
}
@ -2909,7 +2929,6 @@ static int io_async_buf_func(struct wait_queue_entry *wait, unsigned mode,
struct io_kiocb *req = wait->private;
struct io_async_rw *rw = &req->io->rw;
struct wait_page_key *key = arg;
struct task_struct *tsk;
int ret;
wpq = container_of(wait, struct wait_page_queue, wait);
@ -2923,15 +2942,16 @@ static int io_async_buf_func(struct wait_queue_entry *wait, unsigned mode,
init_task_work(&rw->task_work, io_async_buf_retry);
/* submit ref gets dropped, acquire a new one */
refcount_inc(&req->refs);
tsk = req->task;
ret = task_work_add(tsk, &rw->task_work, true);
ret = io_req_task_work_add(req, &rw->task_work);
if (unlikely(ret)) {
struct task_struct *tsk;
/* queue just for cancelation */
init_task_work(&rw->task_work, io_async_buf_cancel);
tsk = io_wq_get_task(req->ctx->io_wq);
task_work_add(tsk, &rw->task_work, true);
task_work_add(tsk, &rw->task_work, 0);
wake_up_process(tsk);
}
wake_up_process(tsk);
return 1;
}
@ -4424,33 +4444,9 @@ struct io_poll_table {
int error;
};
static int io_req_task_work_add(struct io_kiocb *req, struct callback_head *cb)
{
struct task_struct *tsk = req->task;
struct io_ring_ctx *ctx = req->ctx;
int ret, notify = TWA_RESUME;
/*
* SQPOLL kernel thread doesn't need notification, just a wakeup.
* If we're not using an eventfd, then TWA_RESUME is always fine,
* as we won't have dependencies between request completions for
* other kernel wait conditions.
*/
if (ctx->flags & IORING_SETUP_SQPOLL)
notify = 0;
else if (ctx->cq_ev_fd)
notify = TWA_SIGNAL;
ret = task_work_add(tsk, cb, notify);
if (!ret)
wake_up_process(tsk);
return ret;
}
static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll,
__poll_t mask, task_work_func_t func)
{
struct task_struct *tsk;
int ret;
/* for instances that support it check for an event match first: */
@ -4461,7 +4457,6 @@ static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll,
list_del_init(&poll->wait.entry);
tsk = req->task;
req->result = mask;
init_task_work(&req->task_work, func);
/*
@ -4472,6 +4467,8 @@ static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll,
*/
ret = io_req_task_work_add(req, &req->task_work);
if (unlikely(ret)) {
struct task_struct *tsk;
WRITE_ONCE(poll->canceled, true);
tsk = io_wq_get_task(req->ctx->io_wq);
task_work_add(tsk, &req->task_work, 0);