v4.19.13 snapshot.
diff --git a/include/linux/sunrpc/sched.h b/include/linux/sunrpc/sched.h
new file mode 100644
index 0000000..592653b
--- /dev/null
+++ b/include/linux/sunrpc/sched.h
@@ -0,0 +1,302 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * linux/include/linux/sunrpc/sched.h
+ *
+ * Scheduling primitives for kernel Sun RPC.
+ *
+ * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
+ */
+
+#ifndef _LINUX_SUNRPC_SCHED_H_
+#define _LINUX_SUNRPC_SCHED_H_
+
+#include <linux/timer.h>
+#include <linux/ktime.h>
+#include <linux/sunrpc/types.h>
+#include <linux/spinlock.h>
+#include <linux/wait_bit.h>
+#include <linux/workqueue.h>
+#include <linux/sunrpc/xdr.h>
+
+/*
+ * This is the actual RPC procedure call info.
+ */
+struct rpc_procinfo;
+struct rpc_message {
+ const struct rpc_procinfo *rpc_proc; /* Procedure information */
+ void * rpc_argp; /* Arguments */
+ void * rpc_resp; /* Result */
+ struct rpc_cred * rpc_cred; /* Credentials */
+};
+
+struct rpc_call_ops;
+struct rpc_wait_queue;
+struct rpc_wait {
+ struct list_head list; /* wait queue links */
+ struct list_head links; /* Links to related tasks */
+ struct list_head timer_list; /* Timer list */
+ unsigned long expires;
+};
+
+/*
+ * This is the RPC task struct
+ */
+struct rpc_task {
+ atomic_t tk_count; /* Reference count */
+ int tk_status; /* result of last operation */
+ struct list_head tk_task; /* global list of tasks */
+
+ /*
+ * callback to be executed after waking up
+ * action next procedure for async tasks
+ */
+ void (*tk_callback)(struct rpc_task *);
+ void (*tk_action)(struct rpc_task *);
+
+ unsigned long tk_timeout; /* timeout for rpc_sleep() */
+ unsigned long tk_runstate; /* Task run status */
+
+ struct rpc_wait_queue *tk_waitqueue; /* RPC wait queue we're on */
+ union {
+ struct work_struct tk_work; /* Async task work queue */
+ struct rpc_wait tk_wait; /* RPC wait */
+ } u;
+
+ /*
+ * RPC call state
+ */
+ struct rpc_message tk_msg; /* RPC call info */
+ void * tk_calldata; /* Caller private data */
+ const struct rpc_call_ops *tk_ops; /* Caller callbacks */
+
+ struct rpc_clnt * tk_client; /* RPC client */
+ struct rpc_xprt * tk_xprt; /* Transport */
+
+ struct rpc_rqst * tk_rqstp; /* RPC request */
+
+ struct workqueue_struct *tk_workqueue; /* Normally rpciod, but could
+ * be any workqueue
+ */
+ ktime_t tk_start; /* RPC task init timestamp */
+
+ pid_t tk_owner; /* Process id for batching tasks */
+ unsigned short tk_flags; /* misc flags */
+ unsigned short tk_timeouts; /* maj timeouts */
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG) || IS_ENABLED(CONFIG_TRACEPOINTS)
+ unsigned short tk_pid; /* debugging aid */
+#endif
+ unsigned char tk_priority : 2,/* Task priority */
+ tk_garb_retry : 2,
+ tk_cred_retry : 2,
+ tk_rebind_retry : 2;
+};
+
+typedef void (*rpc_action)(struct rpc_task *);
+
+struct rpc_call_ops {
+ void (*rpc_call_prepare)(struct rpc_task *, void *);
+ void (*rpc_call_done)(struct rpc_task *, void *);
+ void (*rpc_count_stats)(struct rpc_task *, void *);
+ void (*rpc_release)(void *);
+};
+
+struct rpc_task_setup {
+ struct rpc_task *task;
+ struct rpc_clnt *rpc_client;
+ struct rpc_xprt *rpc_xprt;
+ const struct rpc_message *rpc_message;
+ const struct rpc_call_ops *callback_ops;
+ void *callback_data;
+ struct workqueue_struct *workqueue;
+ unsigned short flags;
+ signed char priority;
+};
+
+/*
+ * RPC task flags
+ */
+#define RPC_TASK_ASYNC 0x0001 /* is an async task */
+#define RPC_TASK_SWAPPER 0x0002 /* is swapping in/out */
+#define RPC_CALL_MAJORSEEN 0x0020 /* major timeout seen */
+#define RPC_TASK_ROOTCREDS 0x0040 /* force root creds */
+#define RPC_TASK_DYNAMIC 0x0080 /* task was kmalloc'ed */
+#define RPC_TASK_KILLED 0x0100 /* task was killed */
+#define RPC_TASK_SOFT 0x0200 /* Use soft timeouts */
+#define RPC_TASK_SOFTCONN 0x0400 /* Fail if can't connect */
+#define RPC_TASK_SENT 0x0800 /* message was sent */
+#define RPC_TASK_TIMEOUT 0x1000 /* fail with ETIMEDOUT on timeout */
+#define RPC_TASK_NOCONNECT 0x2000 /* return ENOTCONN if not connected */
+#define RPC_TASK_NO_RETRANS_TIMEOUT 0x4000 /* wait forever for a reply */
+
+#define RPC_IS_ASYNC(t) ((t)->tk_flags & RPC_TASK_ASYNC)
+#define RPC_IS_SWAPPER(t) ((t)->tk_flags & RPC_TASK_SWAPPER)
+#define RPC_DO_ROOTOVERRIDE(t) ((t)->tk_flags & RPC_TASK_ROOTCREDS)
+#define RPC_ASSASSINATED(t) ((t)->tk_flags & RPC_TASK_KILLED)
+#define RPC_IS_SOFT(t) ((t)->tk_flags & (RPC_TASK_SOFT|RPC_TASK_TIMEOUT))
+#define RPC_IS_SOFTCONN(t) ((t)->tk_flags & RPC_TASK_SOFTCONN)
+#define RPC_WAS_SENT(t) ((t)->tk_flags & RPC_TASK_SENT)
+
+#define RPC_TASK_RUNNING 0
+#define RPC_TASK_QUEUED 1
+#define RPC_TASK_ACTIVE 2
+#define RPC_TASK_MSG_RECV 3
+#define RPC_TASK_MSG_RECV_WAIT 4
+
+#define RPC_IS_RUNNING(t) test_bit(RPC_TASK_RUNNING, &(t)->tk_runstate)
+#define rpc_set_running(t) set_bit(RPC_TASK_RUNNING, &(t)->tk_runstate)
+#define rpc_test_and_set_running(t) \
+ test_and_set_bit(RPC_TASK_RUNNING, &(t)->tk_runstate)
+#define rpc_clear_running(t) \
+ do { \
+ smp_mb__before_atomic(); \
+ clear_bit(RPC_TASK_RUNNING, &(t)->tk_runstate); \
+ smp_mb__after_atomic(); \
+ } while (0)
+
+#define RPC_IS_QUEUED(t) test_bit(RPC_TASK_QUEUED, &(t)->tk_runstate)
+#define rpc_set_queued(t) set_bit(RPC_TASK_QUEUED, &(t)->tk_runstate)
+#define rpc_clear_queued(t) \
+ do { \
+ smp_mb__before_atomic(); \
+ clear_bit(RPC_TASK_QUEUED, &(t)->tk_runstate); \
+ smp_mb__after_atomic(); \
+ } while (0)
+
+#define RPC_IS_ACTIVATED(t) test_bit(RPC_TASK_ACTIVE, &(t)->tk_runstate)
+
+/*
+ * Task priorities.
+ * Note: if you change these, you must also change
+ * the task initialization definitions below.
+ */
+#define RPC_PRIORITY_LOW (-1)
+#define RPC_PRIORITY_NORMAL (0)
+#define RPC_PRIORITY_HIGH (1)
+#define RPC_PRIORITY_PRIVILEGED (2)
+#define RPC_NR_PRIORITY (1 + RPC_PRIORITY_PRIVILEGED - RPC_PRIORITY_LOW)
+
+struct rpc_timer {
+ struct timer_list timer;
+ struct list_head list;
+ unsigned long expires;
+};
+
+/*
+ * RPC synchronization objects
+ */
+struct rpc_wait_queue {
+ spinlock_t lock;
+ struct list_head tasks[RPC_NR_PRIORITY]; /* task queue for each priority level */
+ pid_t owner; /* process id of last task serviced */
+ unsigned char maxpriority; /* maximum priority (0 if queue is not a priority queue) */
+ unsigned char priority; /* current priority */
+ unsigned char nr; /* # tasks remaining for cookie */
+ unsigned short qlen; /* total # tasks waiting in queue */
+ struct rpc_timer timer_list;
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG) || IS_ENABLED(CONFIG_TRACEPOINTS)
+ const char * name;
+#endif
+};
+
+/*
+ * This is the # requests to send consecutively
+ * from a single cookie. The aim is to improve
+ * performance of NFS operations such as read/write.
+ */
+#define RPC_BATCH_COUNT 16
+#define RPC_IS_PRIORITY(q) ((q)->maxpriority > 0)
+
+/*
+ * Function prototypes
+ */
+struct rpc_task *rpc_new_task(const struct rpc_task_setup *);
+struct rpc_task *rpc_run_task(const struct rpc_task_setup *);
+struct rpc_task *rpc_run_bc_task(struct rpc_rqst *req);
+void rpc_put_task(struct rpc_task *);
+void rpc_put_task_async(struct rpc_task *);
+void rpc_exit_task(struct rpc_task *);
+void rpc_exit(struct rpc_task *, int);
+void rpc_release_calldata(const struct rpc_call_ops *, void *);
+void rpc_killall_tasks(struct rpc_clnt *);
+void rpc_execute(struct rpc_task *);
+void rpc_init_priority_wait_queue(struct rpc_wait_queue *, const char *);
+void rpc_init_wait_queue(struct rpc_wait_queue *, const char *);
+void rpc_destroy_wait_queue(struct rpc_wait_queue *);
+void rpc_sleep_on(struct rpc_wait_queue *, struct rpc_task *,
+ rpc_action action);
+void rpc_sleep_on_priority(struct rpc_wait_queue *,
+ struct rpc_task *,
+ rpc_action action,
+ int priority);
+void rpc_wake_up_queued_task_on_wq(struct workqueue_struct *wq,
+ struct rpc_wait_queue *queue,
+ struct rpc_task *task);
+void rpc_wake_up_queued_task(struct rpc_wait_queue *,
+ struct rpc_task *);
+void rpc_wake_up(struct rpc_wait_queue *);
+struct rpc_task *rpc_wake_up_next(struct rpc_wait_queue *);
+struct rpc_task *rpc_wake_up_first_on_wq(struct workqueue_struct *wq,
+ struct rpc_wait_queue *,
+ bool (*)(struct rpc_task *, void *),
+ void *);
+struct rpc_task *rpc_wake_up_first(struct rpc_wait_queue *,
+ bool (*)(struct rpc_task *, void *),
+ void *);
+void rpc_wake_up_status(struct rpc_wait_queue *, int);
+void rpc_delay(struct rpc_task *, unsigned long);
+int rpc_malloc(struct rpc_task *);
+void rpc_free(struct rpc_task *);
+int rpciod_up(void);
+void rpciod_down(void);
+int __rpc_wait_for_completion_task(struct rpc_task *task, wait_bit_action_f *);
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+struct net;
+void rpc_show_tasks(struct net *);
+#endif
+int rpc_init_mempool(void);
+void rpc_destroy_mempool(void);
+extern struct workqueue_struct *rpciod_workqueue;
+extern struct workqueue_struct *xprtiod_workqueue;
+void rpc_prepare_task(struct rpc_task *task);
+
+static inline int rpc_wait_for_completion_task(struct rpc_task *task)
+{
+ return __rpc_wait_for_completion_task(task, NULL);
+}
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG) || IS_ENABLED(CONFIG_TRACEPOINTS)
+static inline const char * rpc_qname(const struct rpc_wait_queue *q)
+{
+ return ((q && q->name) ? q->name : "unknown");
+}
+
+static inline void rpc_assign_waitqueue_name(struct rpc_wait_queue *q,
+ const char *name)
+{
+ q->name = name;
+}
+#else
+static inline void rpc_assign_waitqueue_name(struct rpc_wait_queue *q,
+ const char *name)
+{
+}
+#endif
+
+#if IS_ENABLED(CONFIG_SUNRPC_SWAP)
+int rpc_clnt_swap_activate(struct rpc_clnt *clnt);
+void rpc_clnt_swap_deactivate(struct rpc_clnt *clnt);
+#else
+static inline int
+rpc_clnt_swap_activate(struct rpc_clnt *clnt)
+{
+ return -EINVAL;
+}
+
+static inline void
+rpc_clnt_swap_deactivate(struct rpc_clnt *clnt)
+{
+}
+#endif /* CONFIG_SUNRPC_SWAP */
+
+#endif /* _LINUX_SUNRPC_SCHED_H_ */