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/sunrpc/types.h>
14 #include <linux/rcupdate.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 rpc_wait_queue
* rpc_waitq
; /* RPC wait queue we're on */
40 * This is the RPC task struct
44 unsigned long tk_magic
; /* 0xf00baa */
46 atomic_t tk_count
; /* Reference count */
47 struct list_head tk_task
; /* global list of tasks */
48 struct rpc_clnt
* tk_client
; /* RPC client */
49 struct rpc_rqst
* tk_rqstp
; /* RPC request */
50 int tk_status
; /* result of last operation */
55 struct rpc_message tk_msg
; /* RPC call info */
59 unsigned long tk_cookie
; /* Cookie for batching tasks */
62 * timeout_fn to be executed by timer bottom half
63 * callback to be executed after waking up
64 * action next procedure for async tasks
65 * tk_ops caller callbacks
67 void (*tk_timeout_fn
)(struct rpc_task
*);
68 void (*tk_callback
)(struct rpc_task
*);
69 void (*tk_action
)(struct rpc_task
*);
70 const struct rpc_call_ops
*tk_ops
;
74 * tk_timer is used for async processing by the RPC scheduling
75 * primitives. You should not access this directly unless
76 * you have a pathological interest in kernel oopses.
78 struct timer_list tk_timer
; /* kernel timer */
79 unsigned long tk_timeout
; /* timeout for rpc_sleep() */
80 unsigned short tk_flags
; /* misc flags */
81 unsigned char tk_priority
: 2;/* Task priority */
82 unsigned long tk_runstate
; /* Task run status */
83 struct workqueue_struct
*tk_workqueue
; /* Normally rpciod, but could
87 struct work_struct tk_work
; /* Async task work queue */
88 struct rpc_wait tk_wait
; /* RPC wait */
89 struct rcu_head tk_rcu
; /* for task deletion */
92 unsigned short tk_timeouts
; /* maj timeouts */
93 size_t tk_bytes_sent
; /* total bytes sent */
94 unsigned long tk_start
; /* RPC task init timestamp */
95 long tk_rtt
; /* round-trip time (jiffies) */
98 unsigned short tk_pid
; /* debugging aid */
101 #define tk_auth tk_client->cl_auth
102 #define tk_xprt tk_client->cl_xprt
104 /* support walking a list of tasks on a wait queue */
105 #define task_for_each(task, pos, head) \
106 list_for_each(pos, head) \
107 if ((task=list_entry(pos, struct rpc_task, u.tk_wait.list)),1)
109 #define task_for_first(task, head) \
110 if (!list_empty(head) && \
111 ((task=list_entry((head)->next, struct rpc_task, u.tk_wait.list)),1))
113 /* .. and walking list of all tasks */
114 #define alltask_for_each(task, pos, head) \
115 list_for_each(pos, head) \
116 if ((task=list_entry(pos, struct rpc_task, tk_task)),1)
118 typedef void (*rpc_action
)(struct rpc_task
*);
120 struct rpc_call_ops
{
121 void (*rpc_call_prepare
)(struct rpc_task
*, void *);
122 void (*rpc_call_done
)(struct rpc_task
*, void *);
123 void (*rpc_release
)(void *);
130 #define RPC_TASK_ASYNC 0x0001 /* is an async task */
131 #define RPC_TASK_SWAPPER 0x0002 /* is swapping in/out */
132 #define RPC_CALL_MAJORSEEN 0x0020 /* major timeout seen */
133 #define RPC_TASK_ROOTCREDS 0x0040 /* force root creds */
134 #define RPC_TASK_DYNAMIC 0x0080 /* task was kmalloc'ed */
135 #define RPC_TASK_KILLED 0x0100 /* task was killed */
136 #define RPC_TASK_SOFT 0x0200 /* Use soft timeouts */
137 #define RPC_TASK_NOINTR 0x0400 /* uninterruptible task */
139 #define RPC_IS_ASYNC(t) ((t)->tk_flags & RPC_TASK_ASYNC)
140 #define RPC_IS_SWAPPER(t) ((t)->tk_flags & RPC_TASK_SWAPPER)
141 #define RPC_DO_ROOTOVERRIDE(t) ((t)->tk_flags & RPC_TASK_ROOTCREDS)
142 #define RPC_ASSASSINATED(t) ((t)->tk_flags & RPC_TASK_KILLED)
143 #define RPC_DO_CALLBACK(t) ((t)->tk_callback != NULL)
144 #define RPC_IS_SOFT(t) ((t)->tk_flags & RPC_TASK_SOFT)
145 #define RPC_TASK_UNINTERRUPTIBLE(t) ((t)->tk_flags & RPC_TASK_NOINTR)
147 #define RPC_TASK_RUNNING 0
148 #define RPC_TASK_QUEUED 1
149 #define RPC_TASK_WAKEUP 2
150 #define RPC_TASK_HAS_TIMER 3
151 #define RPC_TASK_ACTIVE 4
153 #define RPC_IS_RUNNING(t) test_bit(RPC_TASK_RUNNING, &(t)->tk_runstate)
154 #define rpc_set_running(t) set_bit(RPC_TASK_RUNNING, &(t)->tk_runstate)
155 #define rpc_test_and_set_running(t) \
156 test_and_set_bit(RPC_TASK_RUNNING, &(t)->tk_runstate)
157 #define rpc_clear_running(t) \
159 smp_mb__before_clear_bit(); \
160 clear_bit(RPC_TASK_RUNNING, &(t)->tk_runstate); \
161 smp_mb__after_clear_bit(); \
164 #define RPC_IS_QUEUED(t) test_bit(RPC_TASK_QUEUED, &(t)->tk_runstate)
165 #define rpc_set_queued(t) set_bit(RPC_TASK_QUEUED, &(t)->tk_runstate)
166 #define rpc_clear_queued(t) \
168 smp_mb__before_clear_bit(); \
169 clear_bit(RPC_TASK_QUEUED, &(t)->tk_runstate); \
170 smp_mb__after_clear_bit(); \
173 #define rpc_start_wakeup(t) \
174 (test_and_set_bit(RPC_TASK_WAKEUP, &(t)->tk_runstate) == 0)
175 #define rpc_finish_wakeup(t) \
177 smp_mb__before_clear_bit(); \
178 clear_bit(RPC_TASK_WAKEUP, &(t)->tk_runstate); \
179 smp_mb__after_clear_bit(); \
182 #define RPC_IS_ACTIVATED(t) test_bit(RPC_TASK_ACTIVE, &(t)->tk_runstate)
186 * Note: if you change these, you must also change
187 * the task initialization definitions below.
189 #define RPC_PRIORITY_LOW 0
190 #define RPC_PRIORITY_NORMAL 1
191 #define RPC_PRIORITY_HIGH 2
192 #define RPC_NR_PRIORITY (RPC_PRIORITY_HIGH+1)
195 * RPC synchronization objects
197 struct rpc_wait_queue
{
199 struct list_head tasks
[RPC_NR_PRIORITY
]; /* task queue for each priority level */
200 unsigned long cookie
; /* cookie of last task serviced */
201 unsigned char maxpriority
; /* maximum priority (0 if queue is not a priority queue) */
202 unsigned char priority
; /* current priority */
203 unsigned char count
; /* # task groups remaining serviced so far */
204 unsigned char nr
; /* # tasks remaining for cookie */
205 unsigned short qlen
; /* total # tasks waiting in queue */
212 * This is the # requests to send consecutively
213 * from a single cookie. The aim is to improve
214 * performance of NFS operations such as read/write.
216 #define RPC_BATCH_COUNT 16
219 # define RPC_WAITQ_INIT(var,qname) { \
220 .lock = __SPIN_LOCK_UNLOCKED(var.lock), \
222 [0] = LIST_HEAD_INIT(var.tasks[0]), \
223 [1] = LIST_HEAD_INIT(var.tasks[1]), \
224 [2] = LIST_HEAD_INIT(var.tasks[2]), \
228 # define RPC_WAITQ_INIT(var,qname) { \
229 .lock = __SPIN_LOCK_UNLOCKED(var.lock), \
231 [0] = LIST_HEAD_INIT(var.tasks[0]), \
232 [1] = LIST_HEAD_INIT(var.tasks[1]), \
233 [2] = LIST_HEAD_INIT(var.tasks[2]), \
238 # define RPC_WAITQ(var,qname) struct rpc_wait_queue var = RPC_WAITQ_INIT(var,qname)
240 #define RPC_IS_PRIORITY(q) ((q)->maxpriority > 0)
243 * Function prototypes
245 struct rpc_task
*rpc_new_task(struct rpc_clnt
*, int flags
,
246 const struct rpc_call_ops
*ops
, void *data
);
247 struct rpc_task
*rpc_run_task(struct rpc_clnt
*clnt
, int flags
,
248 const struct rpc_call_ops
*ops
, void *data
);
249 void rpc_init_task(struct rpc_task
*task
, struct rpc_clnt
*clnt
,
250 int flags
, const struct rpc_call_ops
*ops
,
252 void rpc_put_task(struct rpc_task
*);
253 void rpc_exit_task(struct rpc_task
*);
254 void rpc_release_calldata(const struct rpc_call_ops
*, void *);
255 void rpc_killall_tasks(struct rpc_clnt
*);
256 void rpc_execute(struct rpc_task
*);
257 void rpc_init_priority_wait_queue(struct rpc_wait_queue
*, const char *);
258 void rpc_init_wait_queue(struct rpc_wait_queue
*, const char *);
259 void rpc_sleep_on(struct rpc_wait_queue
*, struct rpc_task
*,
260 rpc_action action
, rpc_action timer
);
261 void rpc_wake_up_task(struct rpc_task
*);
262 void rpc_wake_up(struct rpc_wait_queue
*);
263 struct rpc_task
*rpc_wake_up_next(struct rpc_wait_queue
*);
264 void rpc_wake_up_status(struct rpc_wait_queue
*, int);
265 void rpc_delay(struct rpc_task
*, unsigned long);
266 void * rpc_malloc(struct rpc_task
*, size_t);
267 void rpc_free(void *);
269 void rpciod_down(void);
270 int __rpc_wait_for_completion_task(struct rpc_task
*task
, int (*)(void *));
272 void rpc_show_tasks(void);
274 int rpc_init_mempool(void);
275 void rpc_destroy_mempool(void);
276 extern struct workqueue_struct
*rpciod_workqueue
;
278 static inline void rpc_exit(struct rpc_task
*task
, int status
)
280 task
->tk_status
= status
;
281 task
->tk_action
= rpc_exit_task
;
284 static inline int rpc_wait_for_completion_task(struct rpc_task
*task
)
286 return __rpc_wait_for_completion_task(task
, NULL
);
290 static inline const char * rpc_qname(struct rpc_wait_queue
*q
)
292 return ((q
&& q
->name
) ? q
->name
: "unknown");
296 #endif /* _LINUX_SUNRPC_SCHED_H_ */
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