io-wq: remove unused io-wq refcounting

iowq->refs is initialised to one and killed on exit, so it's not used
and we can kill it.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/401007393528ea7c102360e69a29b64498e15db2.1623634181.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/fs/io-wq.c b/fs/io-wq.c
index 1ca98fc..f058ea0 100644 (file)
--- a/fs/io-wq.c
+++ b/fs/io-wq.c
@@ -109,8 +109,6 @@ struct io_wq {
 
        struct io_wq_hash *hash;
 
-       refcount_t refs;
-
        atomic_t worker_refs;
        struct completion worker_done;
 
@@ -949,7 +947,6 @@ struct io_wq *io_wq_create(unsigned bounded, struct io_wq_data *data)
        }
 
        wq->task = get_task_struct(data->task);
-       refcount_set(&wq->refs, 1);
        atomic_set(&wq->worker_refs, 1);
        init_completion(&wq->worker_done);
        return wq;
@@ -1038,8 +1035,7 @@ void io_wq_put_and_exit(struct io_wq *wq)
        WARN_ON_ONCE(!test_bit(IO_WQ_BIT_EXIT, &wq->state));
 
        io_wq_exit_workers(wq);
-       if (refcount_dec_and_test(&wq->refs))
-               io_wq_destroy(wq);
+       io_wq_destroy(wq);
 }
 
 static bool io_wq_worker_affinity(struct io_worker *worker, void *data)