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io-wq: reorder cancellation pending -> running

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Go all over all pending lists and cancel works there, and only then
try to match running requests. No functional changes here, just a
preparation for bulk cancellation.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2020-06-15 10:24:02 +03:00 committed by Jens Axboe
parent 59960b9deb
commit f4c2665e33
1 changed files with 32 additions and 22 deletions
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54
fs/io-wq.c
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@ -927,19 +927,14 @@ static bool io_wq_worker_cancel(struct io_worker *worker, void *data)
return ret;
}
static enum io_wq_cancel io_wqe_cancel_work(struct io_wqe *wqe,
struct io_cb_cancel_data *match)
static bool io_wqe_cancel_pending_work(struct io_wqe *wqe,
struct io_cb_cancel_data *match)
{
struct io_wq_work_node *node, *prev;
struct io_wq_work *work;
unsigned long flags;
bool found = false;
/*
* First check pending list, if we're lucky we can just remove it
* from there. CANCEL_OK means that the work is returned as-new,
* no completion will be posted for it.
*/
spin_lock_irqsave(&wqe->lock, flags);
wq_list_for_each(node, prev, &wqe->work_list) {
work = container_of(node, struct io_wq_work, list);
@ -952,21 +947,20 @@ static enum io_wq_cancel io_wqe_cancel_work(struct io_wqe *wqe,
}
spin_unlock_irqrestore(&wqe->lock, flags);
if (found) {
if (found)
io_run_cancel(work, wqe);
return IO_WQ_CANCEL_OK;
}
return found;
}
static bool io_wqe_cancel_running_work(struct io_wqe *wqe,
struct io_cb_cancel_data *match)
{
bool found;
/*
* Now check if a free (going busy) or busy worker has the work
* currently running. If we find it there, we'll return CANCEL_RUNNING
* as an indication that we attempt to signal cancellation. The
* completion will run normally in this case.
*/
rcu_read_lock();
found = io_wq_for_each_worker(wqe, io_wq_worker_cancel, match);
rcu_read_unlock();
return found ? IO_WQ_CANCEL_RUNNING : IO_WQ_CANCEL_NOTFOUND;
return found;
}
enum io_wq_cancel io_wq_cancel_cb(struct io_wq *wq, work_cancel_fn *cancel,
@ -976,18 +970,34 @@ enum io_wq_cancel io_wq_cancel_cb(struct io_wq *wq, work_cancel_fn *cancel,
.fn = cancel,
.data = data,
};
enum io_wq_cancel ret = IO_WQ_CANCEL_NOTFOUND;
int node;
/*
* First check pending list, if we're lucky we can just remove it
* from there. CANCEL_OK means that the work is returned as-new,
* no completion will be posted for it.
*/
for_each_node(node) {
struct io_wqe *wqe = wq->wqes[node];
ret = io_wqe_cancel_work(wqe, &match);
if (ret != IO_WQ_CANCEL_NOTFOUND)
break;
if (io_wqe_cancel_pending_work(wqe, &match))
return IO_WQ_CANCEL_OK;
}
return ret;
/*
* Now check if a free (going busy) or busy worker has the work
* currently running. If we find it there, we'll return CANCEL_RUNNING
* as an indication that we attempt to signal cancellation. The
* completion will run normally in this case.
*/
for_each_node(node) {
struct io_wqe *wqe = wq->wqes[node];
if (io_wqe_cancel_running_work(wqe, &match))
return IO_WQ_CANCEL_RUNNING;
}
return IO_WQ_CANCEL_NOTFOUND;
}
static bool io_wq_io_cb_cancel_data(struct io_wq_work *work, void *data)