1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * linux/include/linux/sunrpc/sched.h 4 * 5 * Scheduling primitives for kernel Sun RPC. 6 * 7 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de> 8 */ 9 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 * This is the actual RPC procedure call info. 23 */ 24 struct rpc_procinfo; 25 struct rpc_message { 26 const struct rpc_procinfo *rpc_proc; /* Procedure information */ 27 void * rpc_argp; /* Arguments */ 28 void * rpc_resp; /* Result */ 29 struct rpc_cred * rpc_cred; /* Credentials */ 30 }; 31 32 struct rpc_call_ops; 33 struct rpc_wait_queue; 34 struct rpc_wait { 35 struct list_head list; /* wait queue links */ 36 struct list_head links; /* Links to related tasks */ 37 struct list_head timer_list; /* Timer list */ 38 unsigned long expires; 39 }; 40 41 /* 42 * This is the RPC task struct 43 */ 44 struct rpc_task { 45 atomic_t tk_count; /* Reference count */ 46 int tk_status; /* result of last operation */ 47 struct list_head tk_task; /* global list of tasks */ 48 49 /* 50 * callback to be executed after waking up 51 * action next procedure for async tasks 52 */ 53 void (*tk_callback)(struct rpc_task *); 54 void (*tk_action)(struct rpc_task *); 55 56 unsigned long tk_timeout; /* timeout for rpc_sleep() */ 57 unsigned long tk_runstate; /* Task run status */ 58 59 struct rpc_wait_queue *tk_waitqueue; /* RPC wait queue we're on */ 60 union { 61 struct work_struct tk_work; /* Async task work queue */ 62 struct rpc_wait tk_wait; /* RPC wait */ 63 } u; 64 65 /* 66 * RPC call state 67 */ 68 struct rpc_message tk_msg; /* RPC call info */ 69 void * tk_calldata; /* Caller private data */ 70 const struct rpc_call_ops *tk_ops; /* Caller callbacks */ 71 72 struct rpc_clnt * tk_client; /* RPC client */ 73 struct rpc_xprt * tk_xprt; /* Transport */ 74 75 struct rpc_rqst * tk_rqstp; /* RPC request */ 76 77 struct workqueue_struct *tk_workqueue; /* Normally rpciod, but could 78 * be any workqueue 79 */ 80 ktime_t tk_start; /* RPC task init timestamp */ 81 82 pid_t tk_owner; /* Process id for batching tasks */ 83 unsigned short tk_flags; /* misc flags */ 84 unsigned short tk_timeouts; /* maj timeouts */ 85 86 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) || IS_ENABLED(CONFIG_TRACEPOINTS) 87 unsigned short tk_pid; /* debugging aid */ 88 #endif 89 unsigned char tk_priority : 2,/* Task priority */ 90 tk_garb_retry : 2, 91 tk_cred_retry : 2, 92 tk_rebind_retry : 2; 93 }; 94 95 typedef void (*rpc_action)(struct rpc_task *); 96 97 struct rpc_call_ops { 98 void (*rpc_call_prepare)(struct rpc_task *, void *); 99 void (*rpc_call_done)(struct rpc_task *, void *); 100 void (*rpc_count_stats)(struct rpc_task *, void *); 101 void (*rpc_release)(void *); 102 }; 103 104 struct rpc_task_setup { 105 struct rpc_task *task; 106 struct rpc_clnt *rpc_client; 107 struct rpc_xprt *rpc_xprt; 108 const struct rpc_message *rpc_message; 109 const struct rpc_call_ops *callback_ops; 110 void *callback_data; 111 struct workqueue_struct *workqueue; 112 unsigned short flags; 113 signed char priority; 114 }; 115 116 /* 117 * RPC task flags 118 */ 119 #define RPC_TASK_ASYNC 0x0001 /* is an async task */ 120 #define RPC_TASK_SWAPPER 0x0002 /* is swapping in/out */ 121 #define RPC_CALL_MAJORSEEN 0x0020 /* major timeout seen */ 122 #define RPC_TASK_ROOTCREDS 0x0040 /* force root creds */ 123 #define RPC_TASK_DYNAMIC 0x0080 /* task was kmalloc'ed */ 124 #define RPC_TASK_KILLED 0x0100 /* task was killed */ 125 #define RPC_TASK_SOFT 0x0200 /* Use soft timeouts */ 126 #define RPC_TASK_SOFTCONN 0x0400 /* Fail if can't connect */ 127 #define RPC_TASK_SENT 0x0800 /* message was sent */ 128 #define RPC_TASK_TIMEOUT 0x1000 /* fail with ETIMEDOUT on timeout */ 129 #define RPC_TASK_NOCONNECT 0x2000 /* return ENOTCONN if not connected */ 130 #define RPC_TASK_NO_RETRANS_TIMEOUT 0x4000 /* wait forever for a reply */ 131 132 #define RPC_IS_ASYNC(t) ((t)->tk_flags & RPC_TASK_ASYNC) 133 #define RPC_IS_SWAPPER(t) ((t)->tk_flags & RPC_TASK_SWAPPER) 134 #define RPC_DO_ROOTOVERRIDE(t) ((t)->tk_flags & RPC_TASK_ROOTCREDS) 135 #define RPC_ASSASSINATED(t) ((t)->tk_flags & RPC_TASK_KILLED) 136 #define RPC_IS_SOFT(t) ((t)->tk_flags & (RPC_TASK_SOFT|RPC_TASK_TIMEOUT)) 137 #define RPC_IS_SOFTCONN(t) ((t)->tk_flags & RPC_TASK_SOFTCONN) 138 #define RPC_WAS_SENT(t) ((t)->tk_flags & RPC_TASK_SENT) 139 140 #define RPC_TASK_RUNNING 0 141 #define RPC_TASK_QUEUED 1 142 #define RPC_TASK_ACTIVE 2 143 #define RPC_TASK_MSG_RECV 3 144 #define RPC_TASK_MSG_RECV_WAIT 4 145 146 #define RPC_IS_RUNNING(t) test_bit(RPC_TASK_RUNNING, &(t)->tk_runstate) 147 #define rpc_set_running(t) set_bit(RPC_TASK_RUNNING, &(t)->tk_runstate) 148 #define rpc_test_and_set_running(t) \ 149 test_and_set_bit(RPC_TASK_RUNNING, &(t)->tk_runstate) 150 #define rpc_clear_running(t) \ 151 do { \ 152 smp_mb__before_atomic(); \ 153 clear_bit(RPC_TASK_RUNNING, &(t)->tk_runstate); \ 154 smp_mb__after_atomic(); \ 155 } while (0) 156 157 #define RPC_IS_QUEUED(t) test_bit(RPC_TASK_QUEUED, &(t)->tk_runstate) 158 #define rpc_set_queued(t) set_bit(RPC_TASK_QUEUED, &(t)->tk_runstate) 159 #define rpc_clear_queued(t) \ 160 do { \ 161 smp_mb__before_atomic(); \ 162 clear_bit(RPC_TASK_QUEUED, &(t)->tk_runstate); \ 163 smp_mb__after_atomic(); \ 164 } while (0) 165 166 #define RPC_IS_ACTIVATED(t) test_bit(RPC_TASK_ACTIVE, &(t)->tk_runstate) 167 168 /* 169 * Task priorities. 170 * Note: if you change these, you must also change 171 * the task initialization definitions below. 172 */ 173 #define RPC_PRIORITY_LOW (-1) 174 #define RPC_PRIORITY_NORMAL (0) 175 #define RPC_PRIORITY_HIGH (1) 176 #define RPC_PRIORITY_PRIVILEGED (2) 177 #define RPC_NR_PRIORITY (1 + RPC_PRIORITY_PRIVILEGED - RPC_PRIORITY_LOW) 178 179 struct rpc_timer { 180 struct timer_list timer; 181 struct list_head list; 182 unsigned long expires; 183 }; 184 185 /* 186 * RPC synchronization objects 187 */ 188 struct rpc_wait_queue { 189 spinlock_t lock; 190 struct list_head tasks[RPC_NR_PRIORITY]; /* task queue for each priority level */ 191 pid_t owner; /* process id of last task serviced */ 192 unsigned char maxpriority; /* maximum priority (0 if queue is not a priority queue) */ 193 unsigned char priority; /* current priority */ 194 unsigned char nr; /* # tasks remaining for cookie */ 195 unsigned short qlen; /* total # tasks waiting in queue */ 196 struct rpc_timer timer_list; 197 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) || IS_ENABLED(CONFIG_TRACEPOINTS) 198 const char * name; 199 #endif 200 }; 201 202 /* 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. 206 */ 207 #define RPC_BATCH_COUNT 16 208 #define RPC_IS_PRIORITY(q) ((q)->maxpriority > 0) 209 210 /* 211 * Function prototypes 212 */ 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 void rpc_put_task(struct rpc_task *); 217 void rpc_put_task_async(struct rpc_task *); 218 void rpc_exit_task(struct rpc_task *); 219 void rpc_exit(struct rpc_task *, int); 220 void rpc_release_calldata(const struct rpc_call_ops *, void *); 221 void rpc_killall_tasks(struct rpc_clnt *); 222 void rpc_execute(struct rpc_task *); 223 void rpc_init_priority_wait_queue(struct rpc_wait_queue *, const char *); 224 void rpc_init_wait_queue(struct rpc_wait_queue *, const char *); 225 void rpc_destroy_wait_queue(struct rpc_wait_queue *); 226 void rpc_sleep_on(struct rpc_wait_queue *, struct rpc_task *, 227 rpc_action action); 228 void rpc_sleep_on_priority(struct rpc_wait_queue *, 229 struct rpc_task *, 230 rpc_action action, 231 int priority); 232 void rpc_wake_up_queued_task_on_wq(struct workqueue_struct *wq, 233 struct rpc_wait_queue *queue, 234 struct rpc_task *task); 235 void rpc_wake_up_queued_task(struct rpc_wait_queue *, 236 struct rpc_task *); 237 void rpc_wake_up(struct rpc_wait_queue *); 238 struct rpc_task *rpc_wake_up_next(struct rpc_wait_queue *); 239 struct rpc_task *rpc_wake_up_first_on_wq(struct workqueue_struct *wq, 240 struct rpc_wait_queue *, 241 bool (*)(struct rpc_task *, void *), 242 void *); 243 struct rpc_task *rpc_wake_up_first(struct rpc_wait_queue *, 244 bool (*)(struct rpc_task *, void *), 245 void *); 246 void rpc_wake_up_status(struct rpc_wait_queue *, int); 247 void rpc_delay(struct rpc_task *, unsigned long); 248 int rpc_malloc(struct rpc_task *); 249 void rpc_free(struct rpc_task *); 250 int rpciod_up(void); 251 void rpciod_down(void); 252 int __rpc_wait_for_completion_task(struct rpc_task *task, wait_bit_action_f *); 253 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 254 struct net; 255 void rpc_show_tasks(struct net *); 256 #endif 257 int rpc_init_mempool(void); 258 void rpc_destroy_mempool(void); 259 extern struct workqueue_struct *rpciod_workqueue; 260 extern struct workqueue_struct *xprtiod_workqueue; 261 void rpc_prepare_task(struct rpc_task *task); 262 263 static inline int rpc_wait_for_completion_task(struct rpc_task *task) 264 { 265 return __rpc_wait_for_completion_task(task, NULL); 266 } 267 268 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) || IS_ENABLED(CONFIG_TRACEPOINTS) 269 static inline const char * rpc_qname(const struct rpc_wait_queue *q) 270 { 271 return ((q && q->name) ? q->name : "unknown"); 272 } 273 274 static inline void rpc_assign_waitqueue_name(struct rpc_wait_queue *q, 275 const char *name) 276 { 277 q->name = name; 278 } 279 #else 280 static inline void rpc_assign_waitqueue_name(struct rpc_wait_queue *q, 281 const char *name) 282 { 283 } 284 #endif 285 286 #if IS_ENABLED(CONFIG_SUNRPC_SWAP) 287 int rpc_clnt_swap_activate(struct rpc_clnt *clnt); 288 void rpc_clnt_swap_deactivate(struct rpc_clnt *clnt); 289 #else 290 static inline int 291 rpc_clnt_swap_activate(struct rpc_clnt *clnt) 292 { 293 return -EINVAL; 294 } 295 296 static inline void 297 rpc_clnt_swap_deactivate(struct rpc_clnt *clnt) 298 { 299 } 300 #endif /* CONFIG_SUNRPC_SWAP */ 301 302 #endif /* _LINUX_SUNRPC_SCHED_H_ */ 303