Commit 848f7e18 authored by Jens Axboe's avatar Jens Axboe
Browse files

io-wq: make the io_wq ref counted 



In preparation for sharing an io-wq across different users, add a
reference count that manages destruction of it.

Reviewed-by: default avatarPavel Begunkov <asml.silence@gmail.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 9466f437

fs/io-wq.c

+10 −1
Original line number Diff line number Diff line
@@ -113,6 +113,8 @@ struct io_wq { 
	struct mm_struct *mm;

	refcount_t refs;

	struct completion done;



	refcount_t use_refs;

};



static bool io_worker_get(struct io_worker *worker)
@@ -1073,6 +1075,7 @@ struct io_wq *io_wq_create(unsigned bounded, struct io_wq_data *data) 
			ret = -ENOMEM;

			goto err;

		}

		refcount_set(&wq->use_refs, 1);

		reinit_completion(&wq->done);

		return wq;

	}
@@ -1093,7 +1096,7 @@ static bool io_wq_worker_wake(struct io_worker *worker, void *data) 
	return false;

}



void io_wq_destroy(struct io_wq *wq)

static void __io_wq_destroy(struct io_wq *wq)

{

	int node;
@@ -1113,3 +1116,9 @@ void io_wq_destroy(struct io_wq *wq) 
	kfree(wq->wqes);

	kfree(wq);

}



void io_wq_destroy(struct io_wq *wq)

{

	if (refcount_dec_and_test(&wq->use_refs))

		__io_wq_destroy(wq);

}