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/* * 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/sunrpc/types.h> #include <linux/spinlock.h> #include <linux/wait.h> #include <linux/workqueue.h> #include <linux/sunrpc/xdr.h> /* * This is the actual RPC procedure call info. */ struct rpc_procinfo; struct rpc_message { 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 rpc_wait_queue * rpc_waitq; /* RPC wait queue we're on */ }; /* * This is the RPC task struct */ struct rpc_task { #ifdef RPC_DEBUG unsigned long tk_magic; /* 0xf00baa */ #endif atomic_t tk_count; /* Reference count */ struct list_head tk_task; /* global list of tasks */ struct rpc_clnt * tk_client; /* RPC client */ struct rpc_rqst * tk_rqstp; /* RPC request */ int tk_status; /* result of last operation */ /* * RPC call state */ struct rpc_message tk_msg; /* RPC call info */ __u8 tk_garb_retry; __u8 tk_cred_retry; unsigned long tk_cookie; /* Cookie for batching tasks */ /* * timeout_fn to be executed by timer bottom half * callback to be executed after waking up * action next procedure for async tasks * tk_ops caller callbacks */ void (*tk_timeout_fn)(struct rpc_task *); void (*tk_callback)(struct rpc_task *); void (*tk_action)(struct rpc_task *); const struct rpc_call_ops *tk_ops; void * tk_calldata; /* * tk_timer is used for async processing by the RPC scheduling * primitives. You should not access this directly unless * you have a pathological interest in kernel oopses. */ struct timer_list tk_timer; /* kernel timer */ unsigned long tk_timeout; /* timeout for rpc_sleep() */ unsigned short tk_flags; /* misc flags */ unsigned char tk_priority : 2;/* Task priority */ unsigned long tk_runstate; /* Task run status */ struct workqueue_struct *tk_workqueue; /* Normally rpciod, but could * be any workqueue */ union { struct work_struct tk_work; /* Async task work queue */ struct rpc_wait tk_wait; /* RPC wait */ } u; #ifdef RPC_DEBUG unsigned short tk_pid; /* debugging aid */ #endif }; #define tk_auth tk_client->cl_auth #define tk_xprt tk_client->cl_xprt /* support walking a list of tasks on a wait queue */ #define task_for_each(task, pos, head) \ list_for_each(pos, head) \ if ((task=list_entry(pos, struct rpc_task, u.tk_wait.list)),1) #define task_for_first(task, head) \ if (!list_empty(head) && \ ((task=list_entry((head)->next, struct rpc_task, u.tk_wait.list)),1)) /* .. and walking list of all tasks */ #define alltask_for_each(task, pos, head) \ list_for_each(pos, head) \ if ((task=list_entry(pos, struct rpc_task, tk_task)),1) 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_release)(void *); }; /* * RPC task flags */ #define RPC_TASK_ASYNC 0x0001 /* is an async task */ #define RPC_TASK_SWAPPER 0x0002 /* is swapping in/out */ #define RPC_TASK_CHILD 0x0008 /* is child of other task */ #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_NOINTR 0x0400 /* uninterruptible task */ #define RPC_IS_ASYNC(t) ((t)->tk_flags & RPC_TASK_ASYNC) #define RPC_IS_CHILD(t) ((t)->tk_flags & RPC_TASK_CHILD) #define RPC_IS_SWAPPER(t) ((t)->tk_flags & RPC_TASK_SWAPPER) #define RPC_DO_ROOTOVERRIDE(t) ((t)->tk_flags & RPC_TASK_ROOTCREDS) #define RPC_ASSASSINATED(t) ((t)->tk_flags & RPC_TASK_KILLED) #define RPC_DO_CALLBACK(t) ((t)->tk_callback != NULL) #define RPC_IS_SOFT(t) ((t)->tk_flags & RPC_TASK_SOFT) #define RPC_TASK_UNINTERRUPTIBLE(t) ((t)->tk_flags & RPC_TASK_NOINTR) #define RPC_TASK_RUNNING 0 #define RPC_TASK_QUEUED 1 #define RPC_TASK_WAKEUP 2 #define RPC_TASK_HAS_TIMER 3 #define RPC_TASK_ACTIVE 4 #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_clear_bit(); \ clear_bit(RPC_TASK_RUNNING, &(t)->tk_runstate); \ smp_mb__after_clear_bit(); \ } 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_clear_bit(); \ clear_bit(RPC_TASK_QUEUED, &(t)->tk_runstate); \ smp_mb__after_clear_bit(); \ } while (0) #define rpc_start_wakeup(t) \ (test_and_set_bit(RPC_TASK_WAKEUP, &(t)->tk_runstate) == 0) #define rpc_finish_wakeup(t) \ do { \ smp_mb__before_clear_bit(); \ clear_bit(RPC_TASK_WAKEUP, &(t)->tk_runstate); \ smp_mb__after_clear_bit(); \ } while (0) #define RPC_IS_ACTIVATED(t) (test_bit(RPC_TASK_ACTIVE, &(t)->tk_runstate)) #define rpc_set_active(t) (set_bit(RPC_TASK_ACTIVE, &(t)->tk_runstate)) #define rpc_clear_active(t) \ do { \ smp_mb__before_clear_bit(); \ clear_bit(RPC_TASK_ACTIVE, &(t)->tk_runstate); \ smp_mb__after_clear_bit(); \ } while(0) /* * Task priorities. * Note: if you change these, you must also change * the task initialization definitions below. */ #define RPC_PRIORITY_LOW 0 #define RPC_PRIORITY_NORMAL 1 #define RPC_PRIORITY_HIGH 2 #define RPC_NR_PRIORITY (RPC_PRIORITY_HIGH+1) /* * RPC synchronization objects */ struct rpc_wait_queue { spinlock_t lock; struct list_head tasks[RPC_NR_PRIORITY]; /* task queue for each priority level */ unsigned long cookie; /* cookie of last task serviced */ unsigned char maxpriority; /* maximum priority (0 if queue is not a priority queue) */ unsigned char priority; /* current priority */ unsigned char count; /* # task groups remaining serviced so far */ unsigned char nr; /* # tasks remaining for cookie */ #ifdef RPC_DEBUG 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_BATCH_COUNT 16 #ifndef RPC_DEBUG # define RPC_WAITQ_INIT(var,qname) { \ .lock = SPIN_LOCK_UNLOCKED, \ .tasks = { \ [0] = LIST_HEAD_INIT(var.tasks[0]), \ [1] = LIST_HEAD_INIT(var.tasks[1]), \ [2] = LIST_HEAD_INIT(var.tasks[2]), \ }, \ } #else # define RPC_WAITQ_INIT(var,qname) { \ .lock = SPIN_LOCK_UNLOCKED, \ .tasks = { \ [0] = LIST_HEAD_INIT(var.tasks[0]), \ [1] = LIST_HEAD_INIT(var.tasks[1]), \ [2] = LIST_HEAD_INIT(var.tasks[2]), \ }, \ .name = qname, \ } #endif # define RPC_WAITQ(var,qname) struct rpc_wait_queue var = RPC_WAITQ_INIT(var,qname) #define RPC_IS_PRIORITY(q) ((q)->maxpriority > 0) /* * Function prototypes */ struct rpc_task *rpc_new_task(struct rpc_clnt *, int flags, const struct rpc_call_ops *ops, void *data); struct rpc_task *rpc_run_task(struct rpc_clnt *clnt, int flags, const struct rpc_call_ops *ops, void *data); struct rpc_task *rpc_new_child(struct rpc_clnt *, struct rpc_task *parent); void rpc_init_task(struct rpc_task *task, struct rpc_clnt *clnt, int flags, const struct rpc_call_ops *ops, void *data); void rpc_release_task(struct rpc_task *); void rpc_exit_task(struct rpc_task *); void rpc_killall_tasks(struct rpc_clnt *); int rpc_execute(struct rpc_task *); void rpc_run_child(struct rpc_task *parent, struct rpc_task *child, rpc_action action); 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_sleep_on(struct rpc_wait_queue *, struct rpc_task *, rpc_action action, rpc_action timer); void rpc_wake_up_task(struct rpc_task *); void rpc_wake_up(struct rpc_wait_queue *); struct rpc_task *rpc_wake_up_next(struct rpc_wait_queue *); void rpc_wake_up_status(struct rpc_wait_queue *, int); void rpc_delay(struct rpc_task *, unsigned long); void * rpc_malloc(struct rpc_task *, size_t); void rpc_free(struct rpc_task *); int rpciod_up(void); void rpciod_down(void); void rpciod_wake_up(void); int __rpc_wait_for_completion_task(struct rpc_task *task, int (*)(void *)); #ifdef RPC_DEBUG void rpc_show_tasks(void); #endif int rpc_init_mempool(void); void rpc_destroy_mempool(void); static inline void rpc_exit(struct rpc_task *task, int status) { task->tk_status = status; task->tk_action = rpc_exit_task; } static inline int rpc_wait_for_completion_task(struct rpc_task *task) { return __rpc_wait_for_completion_task(task, NULL); } #ifdef RPC_DEBUG static inline const char * rpc_qname(struct rpc_wait_queue *q) { return ((q && q->name) ? q->name : "unknown"); } #endif #endif /* _LINUX_SUNRPC_SCHED_H_ */