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io_uring: simplify task_work func

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Since we don't really use req->task_work anymore, get rid of it together
with the nasty ->func aliasing between ->io_task_work and ->task_work,
and hide ->fallback_node inside of io_task_work.

Also, as task_work is gone now, replace the callback type from
task_work_func_t to a function taking io_kiocb to avoid casting and
simplify code.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2021-06-30 21:54:04 +01:00 committed by Jens Axboe
parent 9011bf9a13
commit 5b0a6acc73
1 changed files with 28 additions and 44 deletions
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72
fs/io_uring.c
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@ -785,9 +785,14 @@ struct async_poll {
struct io_poll_iocb *double_poll;
};
typedef void (*io_req_tw_func_t)(struct io_kiocb *req);
struct io_task_work {
struct io_wq_work_node node;
task_work_func_t func;
union {
struct io_wq_work_node node;
struct llist_node fallback_node;
};
io_req_tw_func_t func;
};
enum {
@ -850,18 +855,13 @@ struct io_kiocb {
/* used with ctx->iopoll_list with reads/writes */
struct list_head inflight_entry;
union {
struct io_task_work io_task_work;
struct callback_head task_work;
};
struct io_task_work io_task_work;
/* for polled requests, i.e. IORING_OP_POLL_ADD and async armed poll */
struct hlist_node hash_node;
struct async_poll *apoll;
struct io_wq_work work;
const struct cred *creds;
struct llist_node fallback_node;
/* store used ubuf, so we can prevent reloading */
struct io_mapped_ubuf *imu;
};
@ -1935,7 +1935,7 @@ static void tctx_task_work(struct callback_head *cb)
ctx = req->ctx;
percpu_ref_get(&ctx->refs);
}
req->task_work.func(&req->task_work);
req->io_task_work.func(req);
node = next;
}
if (wq_list_empty(&tctx->task_list)) {
@ -2006,16 +2006,16 @@ static int io_req_task_work_add(struct io_kiocb *req)
}
static void io_req_task_work_add_fallback(struct io_kiocb *req,
task_work_func_t cb)
io_req_tw_func_t cb)
{
init_task_work(&req->task_work, cb);
if (llist_add(&req->fallback_node, &req->ctx->fallback_llist))
req->io_task_work.func = cb;
if (llist_add(&req->io_task_work.fallback_node,
&req->ctx->fallback_llist))
schedule_delayed_work(&req->ctx->fallback_work, 1);
}
static void io_req_task_cancel(struct callback_head *cb)
static void io_req_task_cancel(struct io_kiocb *req)
{
struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work);
struct io_ring_ctx *ctx = req->ctx;
/* ctx is guaranteed to stay alive while we hold uring_lock */
@ -2024,7 +2024,7 @@ static void io_req_task_cancel(struct callback_head *cb)
mutex_unlock(&ctx->uring_lock);
}
static void __io_req_task_submit(struct io_kiocb *req)
static void io_req_task_submit(struct io_kiocb *req)
{
struct io_ring_ctx *ctx = req->ctx;
@ -2037,17 +2037,10 @@ static void __io_req_task_submit(struct io_kiocb *req)
mutex_unlock(&ctx->uring_lock);
}
static void io_req_task_submit(struct callback_head *cb)
{
struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work);
__io_req_task_submit(req);
}
static void io_req_task_queue_fail(struct io_kiocb *req, int ret)
{
req->result = ret;
req->task_work.func = io_req_task_cancel;
req->io_task_work.func = io_req_task_cancel;
if (unlikely(io_req_task_work_add(req)))
io_req_task_work_add_fallback(req, io_req_task_cancel);
@ -2055,7 +2048,7 @@ static void io_req_task_queue_fail(struct io_kiocb *req, int ret)
static void io_req_task_queue(struct io_kiocb *req)
{
req->task_work.func = io_req_task_submit;
req->io_task_work.func = io_req_task_submit;
if (unlikely(io_req_task_work_add(req)))
io_req_task_queue_fail(req, -ECANCELED);
@ -2169,18 +2162,11 @@ static inline void io_put_req(struct io_kiocb *req)
io_free_req(req);
}
static void io_put_req_deferred_cb(struct callback_head *cb)
{
struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work);
io_free_req(req);
}
static void io_free_req_deferred(struct io_kiocb *req)
{
req->task_work.func = io_put_req_deferred_cb;
req->io_task_work.func = io_free_req;
if (unlikely(io_req_task_work_add(req)))
io_req_task_work_add_fallback(req, io_put_req_deferred_cb);
io_req_task_work_add_fallback(req, io_free_req);
}
static inline void io_put_req_deferred(struct io_kiocb *req, int refs)
@ -2466,8 +2452,8 @@ static void io_fallback_req_func(struct work_struct *work)
struct llist_node *node = llist_del_all(&ctx->fallback_llist);
struct io_kiocb *req, *tmp;
llist_for_each_entry_safe(req, tmp, node, fallback_node)
req->task_work.func(&req->task_work);
llist_for_each_entry_safe(req, tmp, node, io_task_work.fallback_node)
req->io_task_work.func(req);
}
static void __io_complete_rw(struct io_kiocb *req, long res, long res2,
@ -4835,7 +4821,7 @@ struct io_poll_table {
};
static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll,
__poll_t mask, task_work_func_t func)
__poll_t mask, io_req_tw_func_t func)
{
int ret;
@ -4848,7 +4834,7 @@ static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll,
list_del_init(&poll->wait.entry);
req->result = mask;
req->task_work.func = func;
req->io_task_work.func = func;
/*
* If this fails, then the task is exiting. When a task exits, the
@ -4945,9 +4931,8 @@ static bool io_poll_complete(struct io_kiocb *req, __poll_t mask)
return !(flags & IORING_CQE_F_MORE);
}
static void io_poll_task_func(struct callback_head *cb)
static void io_poll_task_func(struct io_kiocb *req)
{
struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work);
struct io_ring_ctx *ctx = req->ctx;
struct io_kiocb *nxt;
@ -4969,7 +4954,7 @@ static void io_poll_task_func(struct callback_head *cb)
if (done) {
nxt = io_put_req_find_next(req);
if (nxt)
__io_req_task_submit(nxt);
io_req_task_submit(nxt);
}
}
}
@ -5078,9 +5063,8 @@ static void io_async_queue_proc(struct file *file, struct wait_queue_head *head,
__io_queue_proc(&apoll->poll, pt, head, &apoll->double_poll);
}
static void io_async_task_func(struct callback_head *cb)
static void io_async_task_func(struct io_kiocb *req)
{
struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work);
struct async_poll *apoll = req->apoll;
struct io_ring_ctx *ctx = req->ctx;
@ -5096,7 +5080,7 @@ static void io_async_task_func(struct callback_head *cb)
spin_unlock_irq(&ctx->completion_lock);
if (!READ_ONCE(apoll->poll.canceled))
__io_req_task_submit(req);
io_req_task_submit(req);
else
io_req_complete_failed(req, -ECANCELED);
}
@ -8817,7 +8801,7 @@ static void io_ring_exit_work(struct work_struct *work)
/*
* Some may use context even when all refs and requests have been put,
* and they are free to do so while still holding uring_lock or
* completion_lock, see __io_req_task_submit(). Apart from other work,
* completion_lock, see io_req_task_submit(). Apart from other work,
* this lock/unlock section also waits them to finish.
*/
mutex_lock(&ctx->uring_lock);