2 * linux/include/linux/sunrpc/sched.h
4 * Scheduling primitives for kernel Sun RPC.
6 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
9 #ifndef _LINUX_SUNRPC_SCHED_H_
10 #define _LINUX_SUNRPC_SCHED_H_
12 #include <linux/timer.h>
13 #include <linux/ktime.h>
14 #include <linux/sunrpc/types.h>
15 #include <linux/spinlock.h>
16 #include <linux/wait.h>
17 #include <linux/workqueue.h>
18 #include <linux/sunrpc/xdr.h>
21 * This is the actual RPC procedure call info.
25 struct rpc_procinfo * rpc_proc; /* Procedure information */
26 void * rpc_argp; /* Arguments */
27 void * rpc_resp; /* Result */
28 struct rpc_cred * rpc_cred; /* Credentials */
32 struct rpc_wait_queue;
34 struct list_head list; /* wait queue links */
35 struct list_head links; /* Links to related tasks */
36 struct list_head timer_list; /* Timer list */
37 unsigned long expires;
41 * This is the RPC task struct
45 unsigned long tk_magic; /* 0xf00baa */
47 atomic_t tk_count; /* Reference count */
48 struct list_head tk_task; /* global list of tasks */
49 struct rpc_clnt * tk_client; /* RPC client */
50 struct rpc_rqst * tk_rqstp; /* RPC request */
51 int tk_status; /* result of last operation */
56 struct rpc_message tk_msg; /* RPC call info */
61 * callback to be executed after waking up
62 * action next procedure for async tasks
63 * tk_ops caller callbacks
65 void (*tk_callback)(struct rpc_task *);
66 void (*tk_action)(struct rpc_task *);
67 const struct rpc_call_ops *tk_ops;
70 unsigned long tk_timeout; /* timeout for rpc_sleep() */
71 unsigned short tk_flags; /* misc flags */
72 unsigned long tk_runstate; /* Task run status */
73 struct workqueue_struct *tk_workqueue; /* Normally rpciod, but could
76 struct rpc_wait_queue *tk_waitqueue; /* RPC wait queue we're on */
78 struct work_struct tk_work; /* Async task work queue */
79 struct rpc_wait tk_wait; /* RPC wait */
82 unsigned short tk_timeouts; /* maj timeouts */
83 ktime_t tk_start; /* RPC task init timestamp */
85 pid_t tk_owner; /* Process id for batching tasks */
86 unsigned char tk_priority : 2;/* Task priority */
89 unsigned short tk_pid; /* debugging aid */
92 #define tk_xprt tk_client->cl_xprt
94 /* support walking a list of tasks on a wait queue */
95 #define task_for_each(task, pos, head) \
96 list_for_each(pos, head) \
97 if ((task=list_entry(pos, struct rpc_task, u.tk_wait.list)),1)
99 #define task_for_first(task, head) \
100 if (!list_empty(head) && \
101 ((task=list_entry((head)->next, struct rpc_task, u.tk_wait.list)),1))
103 typedef void (*rpc_action)(struct rpc_task *);
105 struct rpc_call_ops {
106 void (*rpc_call_prepare)(struct rpc_task *, void *);
107 void (*rpc_call_done)(struct rpc_task *, void *);
108 void (*rpc_release)(void *);
111 struct rpc_task_setup {
112 struct rpc_task *task;
113 struct rpc_clnt *rpc_client;
114 const struct rpc_message *rpc_message;
115 const struct rpc_call_ops *callback_ops;
117 struct workqueue_struct *workqueue;
118 unsigned short flags;
119 signed char priority;
125 #define RPC_TASK_ASYNC 0x0001 /* is an async task */
126 #define RPC_TASK_SWAPPER 0x0002 /* is swapping in/out */
127 #define RPC_CALL_MAJORSEEN 0x0020 /* major timeout seen */
128 #define RPC_TASK_ROOTCREDS 0x0040 /* force root creds */
129 #define RPC_TASK_DYNAMIC 0x0080 /* task was kmalloc'ed */
130 #define RPC_TASK_KILLED 0x0100 /* task was killed */
131 #define RPC_TASK_SOFT 0x0200 /* Use soft timeouts */
132 #define RPC_TASK_SOFTCONN 0x0400 /* Fail if can't connect */
134 #define RPC_IS_ASYNC(t) ((t)->tk_flags & RPC_TASK_ASYNC)
135 #define RPC_IS_SWAPPER(t) ((t)->tk_flags & RPC_TASK_SWAPPER)
136 #define RPC_DO_ROOTOVERRIDE(t) ((t)->tk_flags & RPC_TASK_ROOTCREDS)
137 #define RPC_ASSASSINATED(t) ((t)->tk_flags & RPC_TASK_KILLED)
138 #define RPC_IS_SOFT(t) ((t)->tk_flags & RPC_TASK_SOFT)
139 #define RPC_IS_SOFTCONN(t) ((t)->tk_flags & RPC_TASK_SOFTCONN)
141 #define RPC_TASK_RUNNING 0
142 #define RPC_TASK_QUEUED 1
143 #define RPC_TASK_ACTIVE 2
145 #define RPC_IS_RUNNING(t) test_bit(RPC_TASK_RUNNING, &(t)->tk_runstate)
146 #define rpc_set_running(t) set_bit(RPC_TASK_RUNNING, &(t)->tk_runstate)
147 #define rpc_test_and_set_running(t) \
148 test_and_set_bit(RPC_TASK_RUNNING, &(t)->tk_runstate)
149 #define rpc_clear_running(t) \
151 smp_mb__before_clear_bit(); \
152 clear_bit(RPC_TASK_RUNNING, &(t)->tk_runstate); \
153 smp_mb__after_clear_bit(); \
156 #define RPC_IS_QUEUED(t) test_bit(RPC_TASK_QUEUED, &(t)->tk_runstate)
157 #define rpc_set_queued(t) set_bit(RPC_TASK_QUEUED, &(t)->tk_runstate)
158 #define rpc_clear_queued(t) \
160 smp_mb__before_clear_bit(); \
161 clear_bit(RPC_TASK_QUEUED, &(t)->tk_runstate); \
162 smp_mb__after_clear_bit(); \
165 #define RPC_IS_ACTIVATED(t) test_bit(RPC_TASK_ACTIVE, &(t)->tk_runstate)
169 * Note: if you change these, you must also change
170 * the task initialization definitions below.
172 #define RPC_PRIORITY_LOW (-1)
173 #define RPC_PRIORITY_NORMAL (0)
174 #define RPC_PRIORITY_HIGH (1)
175 #define RPC_PRIORITY_PRIVILEGED (2)
176 #define RPC_NR_PRIORITY (1 + RPC_PRIORITY_PRIVILEGED - RPC_PRIORITY_LOW)
179 struct timer_list timer;
180 struct list_head list;
181 unsigned long expires;
185 * RPC synchronization objects
187 struct rpc_wait_queue {
189 struct list_head tasks[RPC_NR_PRIORITY]; /* task queue for each priority level */
190 pid_t owner; /* process id of last task serviced */
191 unsigned char maxpriority; /* maximum priority (0 if queue is not a priority queue) */
192 unsigned char priority; /* current priority */
193 unsigned char count; /* # task groups remaining serviced so far */
194 unsigned char nr; /* # tasks remaining for cookie */
195 unsigned short qlen; /* total # tasks waiting in queue */
196 struct rpc_timer timer_list;
203 * This is the # requests to send consecutively
204 * from a single cookie. The aim is to improve
205 * performance of NFS operations such as read/write.
207 #define RPC_BATCH_COUNT 16
208 #define RPC_IS_PRIORITY(q) ((q)->maxpriority > 0)
211 * Function prototypes
213 struct rpc_task *rpc_new_task(const struct rpc_task_setup *);
214 struct rpc_task *rpc_run_task(const struct rpc_task_setup *);
215 struct rpc_task *rpc_run_bc_task(struct rpc_rqst *req,
216 const struct rpc_call_ops *ops);
217 void rpc_put_task(struct rpc_task *);
218 void rpc_exit_task(struct rpc_task *);
219 void rpc_release_calldata(const struct rpc_call_ops *, void *);
220 void rpc_killall_tasks(struct rpc_clnt *);
221 void rpc_execute(struct rpc_task *);
222 void rpc_init_priority_wait_queue(struct rpc_wait_queue *, const char *);
223 void rpc_init_wait_queue(struct rpc_wait_queue *, const char *);
224 void rpc_destroy_wait_queue(struct rpc_wait_queue *);
225 void rpc_sleep_on(struct rpc_wait_queue *, struct rpc_task *,
227 void rpc_wake_up_queued_task(struct rpc_wait_queue *,
229 void rpc_wake_up(struct rpc_wait_queue *);
230 struct rpc_task *rpc_wake_up_next(struct rpc_wait_queue *);
231 void rpc_wake_up_status(struct rpc_wait_queue *, int);
232 int rpc_queue_empty(struct rpc_wait_queue *);
233 void rpc_delay(struct rpc_task *, unsigned long);
234 void * rpc_malloc(struct rpc_task *, size_t);
235 void rpc_free(void *);
237 void rpciod_down(void);
238 int __rpc_wait_for_completion_task(struct rpc_task *task, int (*)(void *));
240 void rpc_show_tasks(void);
242 int rpc_init_mempool(void);
243 void rpc_destroy_mempool(void);
244 extern struct workqueue_struct *rpciod_workqueue;
245 void rpc_prepare_task(struct rpc_task *task);
247 static inline void rpc_exit(struct rpc_task *task, int status)
249 task->tk_status = status;
250 task->tk_action = rpc_exit_task;
253 static inline int rpc_wait_for_completion_task(struct rpc_task *task)
255 return __rpc_wait_for_completion_task(task, NULL);
258 static inline void rpc_task_set_priority(struct rpc_task *task, unsigned char prio)
260 task->tk_priority = prio - RPC_PRIORITY_LOW;
263 static inline int rpc_task_has_priority(struct rpc_task *task, unsigned char prio)
265 return (task->tk_priority + RPC_PRIORITY_LOW == prio);
269 static inline const char * rpc_qname(struct rpc_wait_queue *q)
271 return ((q && q->name) ? q->name : "unknown");
275 #endif /* _LINUX_SUNRPC_SCHED_H_ */