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10#ifndef _LINUX_SUNRPC_SCHED_H_
11#define _LINUX_SUNRPC_SCHED_H_
12
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>
20
21
22
23
24struct rpc_procinfo;
25struct rpc_message {
26 const struct rpc_procinfo *rpc_proc;
27 void * rpc_argp;
28 void * rpc_resp;
29 const struct cred * rpc_cred;
30};
31
32struct rpc_call_ops;
33struct rpc_wait_queue;
34struct rpc_wait {
35 struct list_head list;
36 struct list_head links;
37 struct list_head timer_list;
38};
39
40
41
42
43struct rpc_task {
44 atomic_t tk_count;
45 int tk_status;
46 struct list_head tk_task;
47
48
49
50
51
52 void (*tk_callback)(struct rpc_task *);
53 void (*tk_action)(struct rpc_task *);
54
55 unsigned long tk_timeout;
56 unsigned long tk_runstate;
57
58 struct rpc_wait_queue *tk_waitqueue;
59 union {
60 struct work_struct tk_work;
61 struct rpc_wait tk_wait;
62 } u;
63
64 int tk_rpc_status;
65
66
67
68
69 struct rpc_message tk_msg;
70 void * tk_calldata;
71 const struct rpc_call_ops *tk_ops;
72
73 struct rpc_clnt * tk_client;
74 struct rpc_xprt * tk_xprt;
75 struct rpc_cred * tk_op_cred;
76
77 struct rpc_rqst * tk_rqstp;
78
79 struct workqueue_struct *tk_workqueue;
80
81
82 ktime_t tk_start;
83
84 pid_t tk_owner;
85 unsigned short tk_flags;
86 unsigned short tk_timeouts;
87
88#if IS_ENABLED(CONFIG_SUNRPC_DEBUG) || IS_ENABLED(CONFIG_TRACEPOINTS)
89 unsigned short tk_pid;
90#endif
91 unsigned char tk_priority : 2,
92 tk_garb_retry : 2,
93 tk_cred_retry : 2,
94 tk_rebind_retry : 2;
95};
96
97typedef void (*rpc_action)(struct rpc_task *);
98
99struct rpc_call_ops {
100 void (*rpc_call_prepare)(struct rpc_task *, void *);
101 void (*rpc_call_done)(struct rpc_task *, void *);
102 void (*rpc_count_stats)(struct rpc_task *, void *);
103 void (*rpc_release)(void *);
104};
105
106struct rpc_task_setup {
107 struct rpc_task *task;
108 struct rpc_clnt *rpc_client;
109 struct rpc_xprt *rpc_xprt;
110 struct rpc_cred *rpc_op_cred;
111 const struct rpc_message *rpc_message;
112 const struct rpc_call_ops *callback_ops;
113 void *callback_data;
114 struct workqueue_struct *workqueue;
115 unsigned short flags;
116 signed char priority;
117};
118
119
120
121
122#define RPC_TASK_ASYNC 0x0001
123#define RPC_TASK_SWAPPER 0x0002
124#define RPC_TASK_NULLCREDS 0x0010
125#define RPC_CALL_MAJORSEEN 0x0020
126#define RPC_TASK_ROOTCREDS 0x0040
127#define RPC_TASK_DYNAMIC 0x0080
128#define RPC_TASK_NO_ROUND_ROBIN 0x0100
129#define RPC_TASK_SOFT 0x0200
130#define RPC_TASK_SOFTCONN 0x0400
131#define RPC_TASK_SENT 0x0800
132#define RPC_TASK_TIMEOUT 0x1000
133#define RPC_TASK_NOCONNECT 0x2000
134#define RPC_TASK_NO_RETRANS_TIMEOUT 0x4000
135
136#define RPC_IS_ASYNC(t) ((t)->tk_flags & RPC_TASK_ASYNC)
137#define RPC_IS_SWAPPER(t) ((t)->tk_flags & RPC_TASK_SWAPPER)
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)
141
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
148#define RPC_TASK_SIGNALLED 6
149
150#define RPC_IS_RUNNING(t) test_bit(RPC_TASK_RUNNING, &(t)->tk_runstate)
151#define rpc_set_running(t) set_bit(RPC_TASK_RUNNING, &(t)->tk_runstate)
152#define rpc_test_and_set_running(t) \
153 test_and_set_bit(RPC_TASK_RUNNING, &(t)->tk_runstate)
154#define rpc_clear_running(t) \
155 do { \
156 smp_mb__before_atomic(); \
157 clear_bit(RPC_TASK_RUNNING, &(t)->tk_runstate); \
158 smp_mb__after_atomic(); \
159 } while (0)
160
161#define RPC_IS_QUEUED(t) test_bit(RPC_TASK_QUEUED, &(t)->tk_runstate)
162#define rpc_set_queued(t) set_bit(RPC_TASK_QUEUED, &(t)->tk_runstate)
163#define rpc_clear_queued(t) \
164 do { \
165 smp_mb__before_atomic(); \
166 clear_bit(RPC_TASK_QUEUED, &(t)->tk_runstate); \
167 smp_mb__after_atomic(); \
168 } while (0)
169
170#define RPC_IS_ACTIVATED(t) test_bit(RPC_TASK_ACTIVE, &(t)->tk_runstate)
171
172#define RPC_SIGNALLED(t) test_bit(RPC_TASK_SIGNALLED, &(t)->tk_runstate)
173
174
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177
178
179#define RPC_PRIORITY_LOW (-1)
180#define RPC_PRIORITY_NORMAL (0)
181#define RPC_PRIORITY_HIGH (1)
182#define RPC_PRIORITY_PRIVILEGED (2)
183#define RPC_NR_PRIORITY (1 + RPC_PRIORITY_PRIVILEGED - RPC_PRIORITY_LOW)
184
185struct rpc_timer {
186 struct list_head list;
187 unsigned long expires;
188 struct delayed_work dwork;
189};
190
191
192
193
194struct rpc_wait_queue {
195 spinlock_t lock;
196 struct list_head tasks[RPC_NR_PRIORITY];
197 unsigned char maxpriority;
198 unsigned char priority;
199 unsigned char nr;
200 unsigned short qlen;
201 struct rpc_timer timer_list;
202#if IS_ENABLED(CONFIG_SUNRPC_DEBUG) || IS_ENABLED(CONFIG_TRACEPOINTS)
203 const char * name;
204#endif
205};
206
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209
210
211
212#define RPC_IS_PRIORITY(q) ((q)->maxpriority > 0)
213
214
215
216
217struct rpc_task *rpc_new_task(const struct rpc_task_setup *);
218struct rpc_task *rpc_run_task(const struct rpc_task_setup *);
219struct rpc_task *rpc_run_bc_task(struct rpc_rqst *req);
220void rpc_put_task(struct rpc_task *);
221void rpc_put_task_async(struct rpc_task *);
222void rpc_signal_task(struct rpc_task *);
223void rpc_exit_task(struct rpc_task *);
224void rpc_exit(struct rpc_task *, int);
225void rpc_release_calldata(const struct rpc_call_ops *, void *);
226void rpc_killall_tasks(struct rpc_clnt *);
227void rpc_execute(struct rpc_task *);
228void rpc_init_priority_wait_queue(struct rpc_wait_queue *, const char *);
229void rpc_init_wait_queue(struct rpc_wait_queue *, const char *);
230void rpc_destroy_wait_queue(struct rpc_wait_queue *);
231unsigned long rpc_task_timeout(const struct rpc_task *task);
232void rpc_sleep_on_timeout(struct rpc_wait_queue *queue,
233 struct rpc_task *task,
234 rpc_action action,
235 unsigned long timeout);
236void rpc_sleep_on(struct rpc_wait_queue *, struct rpc_task *,
237 rpc_action action);
238void rpc_sleep_on_priority_timeout(struct rpc_wait_queue *queue,
239 struct rpc_task *task,
240 unsigned long timeout,
241 int priority);
242void rpc_sleep_on_priority(struct rpc_wait_queue *,
243 struct rpc_task *,
244 int priority);
245void rpc_wake_up_queued_task_on_wq(struct workqueue_struct *wq,
246 struct rpc_wait_queue *queue,
247 struct rpc_task *task);
248void rpc_wake_up_queued_task(struct rpc_wait_queue *,
249 struct rpc_task *);
250void rpc_wake_up_queued_task_set_status(struct rpc_wait_queue *,
251 struct rpc_task *,
252 int);
253void rpc_wake_up(struct rpc_wait_queue *);
254struct rpc_task *rpc_wake_up_next(struct rpc_wait_queue *);
255struct rpc_task *rpc_wake_up_first_on_wq(struct workqueue_struct *wq,
256 struct rpc_wait_queue *,
257 bool (*)(struct rpc_task *, void *),
258 void *);
259struct rpc_task *rpc_wake_up_first(struct rpc_wait_queue *,
260 bool (*)(struct rpc_task *, void *),
261 void *);
262void rpc_wake_up_status(struct rpc_wait_queue *, int);
263void rpc_delay(struct rpc_task *, unsigned long);
264int rpc_malloc(struct rpc_task *);
265void rpc_free(struct rpc_task *);
266int rpciod_up(void);
267void rpciod_down(void);
268int __rpc_wait_for_completion_task(struct rpc_task *task, wait_bit_action_f *);
269#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
270struct net;
271void rpc_show_tasks(struct net *);
272#endif
273int rpc_init_mempool(void);
274void rpc_destroy_mempool(void);
275extern struct workqueue_struct *rpciod_workqueue;
276extern struct workqueue_struct *xprtiod_workqueue;
277void rpc_prepare_task(struct rpc_task *task);
278
279static inline int rpc_wait_for_completion_task(struct rpc_task *task)
280{
281 return __rpc_wait_for_completion_task(task, NULL);
282}
283
284#if IS_ENABLED(CONFIG_SUNRPC_DEBUG) || IS_ENABLED(CONFIG_TRACEPOINTS)
285static inline const char * rpc_qname(const struct rpc_wait_queue *q)
286{
287 return ((q && q->name) ? q->name : "unknown");
288}
289
290static inline void rpc_assign_waitqueue_name(struct rpc_wait_queue *q,
291 const char *name)
292{
293 q->name = name;
294}
295#else
296static inline void rpc_assign_waitqueue_name(struct rpc_wait_queue *q,
297 const char *name)
298{
299}
300#endif
301
302#if IS_ENABLED(CONFIG_SUNRPC_SWAP)
303int rpc_clnt_swap_activate(struct rpc_clnt *clnt);
304void rpc_clnt_swap_deactivate(struct rpc_clnt *clnt);
305#else
306static inline int
307rpc_clnt_swap_activate(struct rpc_clnt *clnt)
308{
309 return -EINVAL;
310}
311
312static inline void
313rpc_clnt_swap_deactivate(struct rpc_clnt *clnt)
314{
315}
316#endif
317
318#endif
319