io-wq: make io_wq_fork_thread() available to other users

We want to use this in io_uring proper as well, for the SQPOLL thread.
Rename it from fork_thread() to io_wq_fork_thread(), and make it
available through the io-wq.h header.

Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/fs/io-wq.c b/fs/io-wq.c
index 3a506f1..b0d09f6 100644 (file)
--- a/fs/io-wq.c
+++ b/fs/io-wq.c
@@ -592,7 +592,7 @@ static int task_thread_unbound(void *data)
        return task_thread(data, IO_WQ_ACCT_UNBOUND);
 }
 
-static pid_t fork_thread(int (*fn)(void *), void *arg)
+pid_t io_wq_fork_thread(int (*fn)(void *), void *arg)
 {
        unsigned long flags = CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|
                                CLONE_IO|SIGCHLD;
@@ -622,9 +622,9 @@ static bool create_io_worker(struct io_wq *wq, struct io_wqe *wqe, int index)
        spin_lock_init(&worker->lock);
 
        if (index == IO_WQ_ACCT_BOUND)
-               pid = fork_thread(task_thread_bound, worker);
+               pid = io_wq_fork_thread(task_thread_bound, worker);
        else
-               pid = fork_thread(task_thread_unbound, worker);
+               pid = io_wq_fork_thread(task_thread_unbound, worker);
        if (pid < 0) {
                kfree(worker);
                return false;
@@ -1012,7 +1012,7 @@ struct io_wq *io_wq_create(unsigned bounded, struct io_wq_data *data)
        refcount_set(&wq->refs, 1);
 
        current->flags |= PF_IO_WORKER;
-       ret = fork_thread(io_wq_manager, wq);
+       ret = io_wq_fork_thread(io_wq_manager, wq);
        current->flags &= ~PF_IO_WORKER;
        if (ret >= 0) {
                wait_for_completion(&wq->done);

diff --git a/fs/io-wq.h b/fs/io-wq.h
index 584f0bd..23f6cbd 100644 (file)
--- a/fs/io-wq.h
+++ b/fs/io-wq.h
@@ -106,6 +106,8 @@ void io_wq_destroy(struct io_wq *wq);
 void io_wq_enqueue(struct io_wq *wq, struct io_wq_work *work);
 void io_wq_hash_work(struct io_wq_work *work, void *val);
 
+pid_t io_wq_fork_thread(int (*fn)(void *), void *arg);
+
 static inline bool io_wq_is_hashed(struct io_wq_work *work)
 {
        return work->flags & IO_WQ_WORK_HASHED;