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io-wq: allow grabbing existing io-wq

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Export a helper to attach to an existing io-wq, rather than setting up
a new one. This is doable now that we have reference counted io_wq's.

Reported-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov
2020-01-28 03:15:47 +03:00
committed by Jens Axboe
parent cccf0ee834
commit eba6f5a330
2 changed files with 9 additions and 0 deletions
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8
fs/io-wq.c
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@@ -1114,6 +1114,14 @@ err:
return ERR_PTR(ret); return ERR_PTR(ret);
} }
bool io_wq_get(struct io_wq *wq, struct io_wq_data *data)
{
if (data->get_work != wq->get_work || data->put_work != wq->put_work)
return false;
return refcount_inc_not_zero(&wq->use_refs);
}
static bool io_wq_worker_wake(struct io_worker *worker, void *data) static bool io_wq_worker_wake(struct io_worker *worker, void *data)
{ {
wake_up_process(worker->task); wake_up_process(worker->task);

1
fs/io-wq.h
View File

@@ -99,6 +99,7 @@ struct io_wq_data {
}; };
struct io_wq *io_wq_create(unsigned bounded, struct io_wq_data *data); struct io_wq *io_wq_create(unsigned bounded, struct io_wq_data *data);
bool io_wq_get(struct io_wq *wq, struct io_wq_data *data);
void io_wq_destroy(struct io_wq *wq); void io_wq_destroy(struct io_wq *wq);
void io_wq_enqueue(struct io_wq *wq, struct io_wq_work *work); void io_wq_enqueue(struct io_wq *wq, struct io_wq_work *work);