• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
1 /*
2  * linux/include/linux/sunrpc/sched.h
3  *
4  * Scheduling primitives for kernel Sun RPC.
5  *
6  * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
7  */
8 
9 #ifndef _LINUX_SUNRPC_SCHED_H_
10 #define _LINUX_SUNRPC_SCHED_H_
11 
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>
19 
20 /*
21  * This is the actual RPC procedure call info.
22  */
23 struct rpc_procinfo;
24 struct rpc_message {
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 */
29 };
30 
31 struct rpc_call_ops;
32 struct rpc_wait_queue;
33 struct rpc_wait {
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;
38 };
39 
40 /*
41  * This is the RPC task struct
42  */
43 struct rpc_task {
44 	atomic_t		tk_count;	/* Reference count */
45 	int			tk_status;	/* result of last operation */
46 	struct list_head	tk_task;	/* global list of tasks */
47 
48 	/*
49 	 * callback	to be executed after waking up
50 	 * action	next procedure for async tasks
51 	 */
52 	void			(*tk_callback)(struct rpc_task *);
53 	void			(*tk_action)(struct rpc_task *);
54 
55 	unsigned long		tk_timeout;	/* timeout for rpc_sleep() */
56 	unsigned long		tk_runstate;	/* Task run status */
57 
58 	struct rpc_wait_queue 	*tk_waitqueue;	/* RPC wait queue we're on */
59 	union {
60 		struct work_struct	tk_work;	/* Async task work queue */
61 		struct rpc_wait		tk_wait;	/* RPC wait */
62 	} u;
63 
64 	/*
65 	 * RPC call state
66 	 */
67 	struct rpc_message	tk_msg;		/* RPC call info */
68 	void *			tk_calldata;	/* Caller private data */
69 	const struct rpc_call_ops *tk_ops;	/* Caller callbacks */
70 
71 	struct rpc_clnt *	tk_client;	/* RPC client */
72 	struct rpc_xprt *	tk_xprt;	/* Transport */
73 
74 	struct rpc_rqst *	tk_rqstp;	/* RPC request */
75 
76 	struct workqueue_struct	*tk_workqueue;	/* Normally rpciod, but could
77 						 * be any workqueue
78 						 */
79 	ktime_t			tk_start;	/* RPC task init timestamp */
80 
81 	pid_t			tk_owner;	/* Process id for batching tasks */
82 	unsigned short		tk_flags;	/* misc flags */
83 	unsigned short		tk_timeouts;	/* maj timeouts */
84 
85 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) || IS_ENABLED(CONFIG_TRACEPOINTS)
86 	unsigned short		tk_pid;		/* debugging aid */
87 #endif
88 	unsigned char		tk_priority : 2,/* Task priority */
89 				tk_garb_retry : 2,
90 				tk_cred_retry : 2,
91 				tk_rebind_retry : 2;
92 };
93 
94 typedef void			(*rpc_action)(struct rpc_task *);
95 
96 struct rpc_call_ops {
97 	void (*rpc_call_prepare)(struct rpc_task *, void *);
98 	void (*rpc_call_done)(struct rpc_task *, void *);
99 	void (*rpc_count_stats)(struct rpc_task *, void *);
100 	void (*rpc_release)(void *);
101 };
102 
103 struct rpc_task_setup {
104 	struct rpc_task *task;
105 	struct rpc_clnt *rpc_client;
106 	struct rpc_xprt *rpc_xprt;
107 	const struct rpc_message *rpc_message;
108 	const struct rpc_call_ops *callback_ops;
109 	void *callback_data;
110 	struct workqueue_struct *workqueue;
111 	unsigned short flags;
112 	signed char priority;
113 };
114 
115 /*
116  * RPC task flags
117  */
118 #define RPC_TASK_ASYNC		0x0001		/* is an async task */
119 #define RPC_TASK_SWAPPER	0x0002		/* is swapping in/out */
120 #define RPC_CALL_MAJORSEEN	0x0020		/* major timeout seen */
121 #define RPC_TASK_ROOTCREDS	0x0040		/* force root creds */
122 #define RPC_TASK_DYNAMIC	0x0080		/* task was kmalloc'ed */
123 #define RPC_TASK_KILLED		0x0100		/* task was killed */
124 #define RPC_TASK_SOFT		0x0200		/* Use soft timeouts */
125 #define RPC_TASK_SOFTCONN	0x0400		/* Fail if can't connect */
126 #define RPC_TASK_SENT		0x0800		/* message was sent */
127 #define RPC_TASK_TIMEOUT	0x1000		/* fail with ETIMEDOUT on timeout */
128 #define RPC_TASK_NOCONNECT	0x2000		/* return ENOTCONN if not connected */
129 #define RPC_TASK_NO_RETRANS_TIMEOUT	0x4000		/* wait forever for a reply */
130 
131 #define RPC_IS_ASYNC(t)		((t)->tk_flags & RPC_TASK_ASYNC)
132 #define RPC_IS_SWAPPER(t)	((t)->tk_flags & RPC_TASK_SWAPPER)
133 #define RPC_DO_ROOTOVERRIDE(t)	((t)->tk_flags & RPC_TASK_ROOTCREDS)
134 #define RPC_ASSASSINATED(t)	((t)->tk_flags & RPC_TASK_KILLED)
135 #define RPC_IS_SOFT(t)		((t)->tk_flags & (RPC_TASK_SOFT|RPC_TASK_TIMEOUT))
136 #define RPC_IS_SOFTCONN(t)	((t)->tk_flags & RPC_TASK_SOFTCONN)
137 #define RPC_WAS_SENT(t)		((t)->tk_flags & RPC_TASK_SENT)
138 
139 #define RPC_TASK_RUNNING	0
140 #define RPC_TASK_QUEUED		1
141 #define RPC_TASK_ACTIVE		2
142 
143 #define RPC_IS_RUNNING(t)	test_bit(RPC_TASK_RUNNING, &(t)->tk_runstate)
144 #define rpc_set_running(t)	set_bit(RPC_TASK_RUNNING, &(t)->tk_runstate)
145 #define rpc_test_and_set_running(t) \
146 				test_and_set_bit(RPC_TASK_RUNNING, &(t)->tk_runstate)
147 #define rpc_clear_running(t)	\
148 	do { \
149 		smp_mb__before_atomic(); \
150 		clear_bit(RPC_TASK_RUNNING, &(t)->tk_runstate); \
151 		smp_mb__after_atomic(); \
152 	} while (0)
153 
154 #define RPC_IS_QUEUED(t)	test_bit(RPC_TASK_QUEUED, &(t)->tk_runstate)
155 #define rpc_set_queued(t)	set_bit(RPC_TASK_QUEUED, &(t)->tk_runstate)
156 #define rpc_clear_queued(t)	\
157 	do { \
158 		smp_mb__before_atomic(); \
159 		clear_bit(RPC_TASK_QUEUED, &(t)->tk_runstate); \
160 		smp_mb__after_atomic(); \
161 	} while (0)
162 
163 #define RPC_IS_ACTIVATED(t)	test_bit(RPC_TASK_ACTIVE, &(t)->tk_runstate)
164 
165 /*
166  * Task priorities.
167  * Note: if you change these, you must also change
168  * the task initialization definitions below.
169  */
170 #define RPC_PRIORITY_LOW	(-1)
171 #define RPC_PRIORITY_NORMAL	(0)
172 #define RPC_PRIORITY_HIGH	(1)
173 #define RPC_PRIORITY_PRIVILEGED	(2)
174 #define RPC_NR_PRIORITY		(1 + RPC_PRIORITY_PRIVILEGED - RPC_PRIORITY_LOW)
175 
176 struct rpc_timer {
177 	struct timer_list timer;
178 	struct list_head list;
179 	unsigned long expires;
180 };
181 
182 /*
183  * RPC synchronization objects
184  */
185 struct rpc_wait_queue {
186 	spinlock_t		lock;
187 	struct list_head	tasks[RPC_NR_PRIORITY];	/* task queue for each priority level */
188 	pid_t			owner;			/* process id of last task serviced */
189 	unsigned char		maxpriority;		/* maximum priority (0 if queue is not a priority queue) */
190 	unsigned char		priority;		/* current priority */
191 	unsigned char		nr;			/* # tasks remaining for cookie */
192 	unsigned short		qlen;			/* total # tasks waiting in queue */
193 	struct rpc_timer	timer_list;
194 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) || IS_ENABLED(CONFIG_TRACEPOINTS)
195 	const char *		name;
196 #endif
197 };
198 
199 /*
200  * This is the # requests to send consecutively
201  * from a single cookie.  The aim is to improve
202  * performance of NFS operations such as read/write.
203  */
204 #define RPC_BATCH_COUNT			16
205 #define RPC_IS_PRIORITY(q)		((q)->maxpriority > 0)
206 
207 /*
208  * Function prototypes
209  */
210 struct rpc_task *rpc_new_task(const struct rpc_task_setup *);
211 struct rpc_task *rpc_run_task(const struct rpc_task_setup *);
212 struct rpc_task *rpc_run_bc_task(struct rpc_rqst *req);
213 void		rpc_put_task(struct rpc_task *);
214 void		rpc_put_task_async(struct rpc_task *);
215 void		rpc_exit_task(struct rpc_task *);
216 void		rpc_exit(struct rpc_task *, int);
217 void		rpc_release_calldata(const struct rpc_call_ops *, void *);
218 void		rpc_killall_tasks(struct rpc_clnt *);
219 void		rpc_execute(struct rpc_task *);
220 void		rpc_init_priority_wait_queue(struct rpc_wait_queue *, const char *);
221 void		rpc_init_wait_queue(struct rpc_wait_queue *, const char *);
222 void		rpc_destroy_wait_queue(struct rpc_wait_queue *);
223 void		rpc_sleep_on(struct rpc_wait_queue *, struct rpc_task *,
224 					rpc_action action);
225 void		rpc_sleep_on_priority(struct rpc_wait_queue *,
226 					struct rpc_task *,
227 					rpc_action action,
228 					int priority);
229 void		rpc_wake_up_queued_task(struct rpc_wait_queue *,
230 					struct rpc_task *);
231 void		rpc_wake_up(struct rpc_wait_queue *);
232 struct rpc_task *rpc_wake_up_next(struct rpc_wait_queue *);
233 struct rpc_task *rpc_wake_up_first_on_wq(struct workqueue_struct *wq,
234 					struct rpc_wait_queue *,
235 					bool (*)(struct rpc_task *, void *),
236 					void *);
237 struct rpc_task *rpc_wake_up_first(struct rpc_wait_queue *,
238 					bool (*)(struct rpc_task *, void *),
239 					void *);
240 void		rpc_wake_up_status(struct rpc_wait_queue *, int);
241 void		rpc_delay(struct rpc_task *, unsigned long);
242 int		rpc_malloc(struct rpc_task *);
243 void		rpc_free(struct rpc_task *);
244 int		rpciod_up(void);
245 void		rpciod_down(void);
246 int		__rpc_wait_for_completion_task(struct rpc_task *task, wait_bit_action_f *);
247 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
248 struct net;
249 void		rpc_show_tasks(struct net *);
250 #endif
251 int		rpc_init_mempool(void);
252 void		rpc_destroy_mempool(void);
253 extern struct workqueue_struct *rpciod_workqueue;
254 extern struct workqueue_struct *xprtiod_workqueue;
255 void		rpc_prepare_task(struct rpc_task *task);
256 
rpc_wait_for_completion_task(struct rpc_task * task)257 static inline int rpc_wait_for_completion_task(struct rpc_task *task)
258 {
259 	return __rpc_wait_for_completion_task(task, NULL);
260 }
261 
262 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) || IS_ENABLED(CONFIG_TRACEPOINTS)
rpc_qname(const struct rpc_wait_queue * q)263 static inline const char * rpc_qname(const struct rpc_wait_queue *q)
264 {
265 	return ((q && q->name) ? q->name : "unknown");
266 }
267 
rpc_assign_waitqueue_name(struct rpc_wait_queue * q,const char * name)268 static inline void rpc_assign_waitqueue_name(struct rpc_wait_queue *q,
269 		const char *name)
270 {
271 	q->name = name;
272 }
273 #else
rpc_assign_waitqueue_name(struct rpc_wait_queue * q,const char * name)274 static inline void rpc_assign_waitqueue_name(struct rpc_wait_queue *q,
275 		const char *name)
276 {
277 }
278 #endif
279 
280 #if IS_ENABLED(CONFIG_SUNRPC_SWAP)
281 int rpc_clnt_swap_activate(struct rpc_clnt *clnt);
282 void rpc_clnt_swap_deactivate(struct rpc_clnt *clnt);
283 #else
284 static inline int
rpc_clnt_swap_activate(struct rpc_clnt * clnt)285 rpc_clnt_swap_activate(struct rpc_clnt *clnt)
286 {
287 	return -EINVAL;
288 }
289 
290 static inline void
rpc_clnt_swap_deactivate(struct rpc_clnt * clnt)291 rpc_clnt_swap_deactivate(struct rpc_clnt *clnt)
292 {
293 }
294 #endif /* CONFIG_SUNRPC_SWAP */
295 
296 #endif /* _LINUX_SUNRPC_SCHED_H_ */
297