1 /* SPDX-License-Identifier: GPL-2.0 */
3 * linux/include/linux/sunrpc/sched.h
5 * Scheduling primitives for kernel Sun RPC.
7 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
10 #ifndef _LINUX_SUNRPC_SCHED_H_
11 #define _LINUX_SUNRPC_SCHED_H_
13 #include <linux/timer.h>
14 #include <linux/ktime.h>
15 #include <linux/sunrpc/types.h>
16 #include <linux/spinlock.h>
17 #include <linux/wait_bit.h>
18 #include <linux/workqueue.h>
19 #include <linux/sunrpc/xdr.h>
22 * This is the actual RPC procedure call info.
26 const struct rpc_procinfo *rpc_proc; /* Procedure information */
27 void * rpc_argp; /* Arguments */
28 void * rpc_resp; /* Result */
29 const struct cred * rpc_cred; /* Credentials */
33 struct rpc_wait_queue;
35 struct list_head list; /* wait queue links */
36 struct list_head links; /* Links to related tasks */
37 struct list_head timer_list; /* Timer list */
38 unsigned long expires;
42 * This is the RPC task struct
45 atomic_t tk_count; /* Reference count */
46 int tk_status; /* result of last operation */
47 struct list_head tk_task; /* global list of tasks */
50 * callback to be executed after waking up
51 * action next procedure for async tasks
53 void (*tk_callback)(struct rpc_task *);
54 void (*tk_action)(struct rpc_task *);
56 unsigned long tk_timeout; /* timeout for rpc_sleep() */
57 unsigned long tk_runstate; /* Task run status */
59 struct rpc_wait_queue *tk_waitqueue; /* RPC wait queue we're on */
61 struct work_struct tk_work; /* Async task work queue */
62 struct rpc_wait tk_wait; /* RPC wait */
68 struct rpc_message tk_msg; /* RPC call info */
69 void * tk_calldata; /* Caller private data */
70 const struct rpc_call_ops *tk_ops; /* Caller callbacks */
72 struct rpc_clnt * tk_client; /* RPC client */
73 struct rpc_xprt * tk_xprt; /* Transport */
74 struct rpc_cred * tk_op_cred; /* cred being operated on */
76 struct rpc_rqst * tk_rqstp; /* RPC request */
78 struct workqueue_struct *tk_workqueue; /* Normally rpciod, but could
81 ktime_t tk_start; /* RPC task init timestamp */
83 pid_t tk_owner; /* Process id for batching tasks */
84 unsigned short tk_flags; /* misc flags */
85 unsigned short tk_timeouts; /* maj timeouts */
87 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) || IS_ENABLED(CONFIG_TRACEPOINTS)
88 unsigned short tk_pid; /* debugging aid */
90 unsigned char tk_priority : 2,/* Task priority */
96 typedef void (*rpc_action)(struct rpc_task *);
99 void (*rpc_call_prepare)(struct rpc_task *, void *);
100 void (*rpc_call_done)(struct rpc_task *, void *);
101 void (*rpc_count_stats)(struct rpc_task *, void *);
102 void (*rpc_release)(void *);
105 struct rpc_task_setup {
106 struct rpc_task *task;
107 struct rpc_clnt *rpc_client;
108 struct rpc_xprt *rpc_xprt;
109 struct rpc_cred *rpc_op_cred; /* credential being operated on */
110 const struct rpc_message *rpc_message;
111 const struct rpc_call_ops *callback_ops;
113 struct workqueue_struct *workqueue;
114 unsigned short flags;
115 signed char priority;
121 #define RPC_TASK_ASYNC 0x0001 /* is an async task */
122 #define RPC_TASK_SWAPPER 0x0002 /* is swapping in/out */
123 #define RPC_TASK_NULLCREDS 0x0010 /* Use AUTH_NULL credential */
124 #define RPC_CALL_MAJORSEEN 0x0020 /* major timeout seen */
125 #define RPC_TASK_ROOTCREDS 0x0040 /* force root creds */
126 #define RPC_TASK_DYNAMIC 0x0080 /* task was kmalloc'ed */
127 #define RPC_TASK_KILLED 0x0100 /* task was killed */
128 #define RPC_TASK_SOFT 0x0200 /* Use soft timeouts */
129 #define RPC_TASK_SOFTCONN 0x0400 /* Fail if can't connect */
130 #define RPC_TASK_SENT 0x0800 /* message was sent */
131 #define RPC_TASK_TIMEOUT 0x1000 /* fail with ETIMEDOUT on timeout */
132 #define RPC_TASK_NOCONNECT 0x2000 /* return ENOTCONN if not connected */
133 #define RPC_TASK_NO_RETRANS_TIMEOUT 0x4000 /* wait forever for a reply */
135 #define RPC_IS_ASYNC(t) ((t)->tk_flags & RPC_TASK_ASYNC)
136 #define RPC_IS_SWAPPER(t) ((t)->tk_flags & RPC_TASK_SWAPPER)
137 #define RPC_ASSASSINATED(t) ((t)->tk_flags & RPC_TASK_KILLED)
138 #define RPC_IS_SOFT(t) ((t)->tk_flags & (RPC_TASK_SOFT|RPC_TASK_TIMEOUT))
139 #define RPC_IS_SOFTCONN(t) ((t)->tk_flags & RPC_TASK_SOFTCONN)
140 #define RPC_WAS_SENT(t) ((t)->tk_flags & RPC_TASK_SENT)
142 #define RPC_TASK_RUNNING 0
143 #define RPC_TASK_QUEUED 1
144 #define RPC_TASK_ACTIVE 2
145 #define RPC_TASK_NEED_XMIT 3
146 #define RPC_TASK_NEED_RECV 4
147 #define RPC_TASK_MSG_PIN_WAIT 5
149 #define RPC_IS_RUNNING(t) test_bit(RPC_TASK_RUNNING, &(t)->tk_runstate)
150 #define rpc_set_running(t) set_bit(RPC_TASK_RUNNING, &(t)->tk_runstate)
151 #define rpc_test_and_set_running(t) \
152 test_and_set_bit(RPC_TASK_RUNNING, &(t)->tk_runstate)
153 #define rpc_clear_running(t) \
155 smp_mb__before_atomic(); \
156 clear_bit(RPC_TASK_RUNNING, &(t)->tk_runstate); \
157 smp_mb__after_atomic(); \
160 #define RPC_IS_QUEUED(t) test_bit(RPC_TASK_QUEUED, &(t)->tk_runstate)
161 #define rpc_set_queued(t) set_bit(RPC_TASK_QUEUED, &(t)->tk_runstate)
162 #define rpc_clear_queued(t) \
164 smp_mb__before_atomic(); \
165 clear_bit(RPC_TASK_QUEUED, &(t)->tk_runstate); \
166 smp_mb__after_atomic(); \
169 #define RPC_IS_ACTIVATED(t) test_bit(RPC_TASK_ACTIVE, &(t)->tk_runstate)
173 * Note: if you change these, you must also change
174 * the task initialization definitions below.
176 #define RPC_PRIORITY_LOW (-1)
177 #define RPC_PRIORITY_NORMAL (0)
178 #define RPC_PRIORITY_HIGH (1)
179 #define RPC_PRIORITY_PRIVILEGED (2)
180 #define RPC_NR_PRIORITY (1 + RPC_PRIORITY_PRIVILEGED - RPC_PRIORITY_LOW)
183 struct timer_list timer;
184 struct list_head list;
185 unsigned long expires;
189 * RPC synchronization objects
191 struct rpc_wait_queue {
193 struct list_head tasks[RPC_NR_PRIORITY]; /* task queue for each priority level */
194 unsigned char maxpriority; /* maximum priority (0 if queue is not a priority queue) */
195 unsigned char priority; /* current priority */
196 unsigned char nr; /* # tasks remaining for cookie */
197 unsigned short qlen; /* total # tasks waiting in queue */
198 struct rpc_timer timer_list;
199 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) || IS_ENABLED(CONFIG_TRACEPOINTS)
205 * This is the # requests to send consecutively
206 * from a single cookie. The aim is to improve
207 * performance of NFS operations such as read/write.
209 #define RPC_IS_PRIORITY(q) ((q)->maxpriority > 0)
212 * Function prototypes
214 struct rpc_task *rpc_new_task(const struct rpc_task_setup *);
215 struct rpc_task *rpc_run_task(const struct rpc_task_setup *);
216 struct rpc_task *rpc_run_bc_task(struct rpc_rqst *req);
217 void rpc_put_task(struct rpc_task *);
218 void rpc_put_task_async(struct rpc_task *);
219 void rpc_exit_task(struct rpc_task *);
220 void rpc_exit(struct rpc_task *, int);
221 void rpc_release_calldata(const struct rpc_call_ops *, void *);
222 void rpc_killall_tasks(struct rpc_clnt *);
223 void rpc_execute(struct rpc_task *);
224 void rpc_init_priority_wait_queue(struct rpc_wait_queue *, const char *);
225 void rpc_init_wait_queue(struct rpc_wait_queue *, const char *);
226 void rpc_destroy_wait_queue(struct rpc_wait_queue *);
227 void rpc_sleep_on(struct rpc_wait_queue *, struct rpc_task *,
229 void rpc_sleep_on_priority(struct rpc_wait_queue *,
233 void rpc_wake_up_queued_task_on_wq(struct workqueue_struct *wq,
234 struct rpc_wait_queue *queue,
235 struct rpc_task *task);
236 void rpc_wake_up_queued_task(struct rpc_wait_queue *,
238 void rpc_wake_up_queued_task_set_status(struct rpc_wait_queue *,
241 void rpc_wake_up(struct rpc_wait_queue *);
242 struct rpc_task *rpc_wake_up_next(struct rpc_wait_queue *);
243 struct rpc_task *rpc_wake_up_first_on_wq(struct workqueue_struct *wq,
244 struct rpc_wait_queue *,
245 bool (*)(struct rpc_task *, void *),
247 struct rpc_task *rpc_wake_up_first(struct rpc_wait_queue *,
248 bool (*)(struct rpc_task *, void *),
250 void rpc_wake_up_status(struct rpc_wait_queue *, int);
251 void rpc_delay(struct rpc_task *, unsigned long);
252 int rpc_malloc(struct rpc_task *);
253 void rpc_free(struct rpc_task *);
255 void rpciod_down(void);
256 int __rpc_wait_for_completion_task(struct rpc_task *task, wait_bit_action_f *);
257 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
259 void rpc_show_tasks(struct net *);
261 int rpc_init_mempool(void);
262 void rpc_destroy_mempool(void);
263 extern struct workqueue_struct *rpciod_workqueue;
264 extern struct workqueue_struct *xprtiod_workqueue;
265 void rpc_prepare_task(struct rpc_task *task);
267 static inline int rpc_wait_for_completion_task(struct rpc_task *task)
269 return __rpc_wait_for_completion_task(task, NULL);
272 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) || IS_ENABLED(CONFIG_TRACEPOINTS)
273 static inline const char * rpc_qname(const struct rpc_wait_queue *q)
275 return ((q && q->name) ? q->name : "unknown");
278 static inline void rpc_assign_waitqueue_name(struct rpc_wait_queue *q,
284 static inline void rpc_assign_waitqueue_name(struct rpc_wait_queue *q,
290 #if IS_ENABLED(CONFIG_SUNRPC_SWAP)
291 int rpc_clnt_swap_activate(struct rpc_clnt *clnt);
292 void rpc_clnt_swap_deactivate(struct rpc_clnt *clnt);
295 rpc_clnt_swap_activate(struct rpc_clnt *clnt)
301 rpc_clnt_swap_deactivate(struct rpc_clnt *clnt)
304 #endif /* CONFIG_SUNRPC_SWAP */
306 #endif /* _LINUX_SUNRPC_SCHED_H_ */