aboutsummaryrefslogtreecommitdiffstats
path: root/include/linux/sunrpc/sched.h
blob: 4e2b893b83a8ecae81034a3c4e590cb8346582e5 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
/* 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_cred *	tk_op_cred;	/* cred being operated on */

	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;
	struct rpc_cred *rpc_op_cred;	/* credential being operated on */
	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_TASK_NULLCREDS	0x0010		/* Use AUTH_NULL credential */
#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_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_NEED_XMIT	3
#define RPC_TASK_NEED_RECV	4
#define RPC_TASK_MSG_PIN_WAIT	5

#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 */
	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_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_queued_task_set_status(struct rpc_wait_queue *,
						   struct rpc_task *,
						   int);
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_ */