From: Pavel Begunkov asml.silence@gmail.com
mainline inclusion from mainline-5.6-rc1 commit eba6f5a330cf042bb0001f0b5e8cbf21be1b25d6 category: feature bugzilla: https://bugzilla.openeuler.org/show_bug.cgi?id=27 CVE: NA ---------------------------
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 Signed-off-by: yangerkun yangerkun@huawei.com Reviewed-by: zhangyi (F) yi.zhang@huawei.com Signed-off-by: Cheng Jian cj.chengjian@huawei.com --- fs/io-wq.c | 8 ++++++++ fs/io-wq.h | 1 + 2 files changed, 9 insertions(+)
diff --git a/fs/io-wq.c b/fs/io-wq.c index 0596627c1c0b..852bedffd508 100644 --- a/fs/io-wq.c +++ b/fs/io-wq.c @@ -1115,6 +1115,14 @@ struct io_wq *io_wq_create(unsigned bounded, struct io_wq_data *data) 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) { wake_up_process(worker->task); diff --git a/fs/io-wq.h b/fs/io-wq.h index 167316ad447e..c42602c58c56 100644 --- a/fs/io-wq.h +++ b/fs/io-wq.h @@ -99,6 +99,7 @@ struct io_wq_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_enqueue(struct io_wq *wq, struct io_wq_work *work);