/* * linux/include/linux/sunrpc/sched.h * * Scheduling primitives for kernel Sun RPC. * * Copyright (C) 1996, Olaf Kirch */ #ifndef _LINUX_SUNRPC_SCHED_H_ #define _LINUX_SUNRPC_SCHED_H_ #include #include #include #include /* * Define this if you want to test the fast scheduler for async calls. * This is still experimental and may not work. */ #undef CONFIG_RPC_FASTSCHED /* * This is the actual RPC procedure call info. */ struct rpc_message { __u32 rpc_proc; /* Procedure number */ void * rpc_argp; /* Arguments */ void * rpc_resp; /* Result */ struct rpc_cred * rpc_cred; /* Credentials */ }; /* * This is the RPC task struct */ struct rpc_task { struct list_head tk_list; /* wait queue links */ #ifdef RPC_DEBUG unsigned long tk_magic; /* 0xf00baa */ #endif 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 */ struct rpc_wait_queue * tk_rpcwait; /* RPC wait queue we're on */ /* * RPC call state */ struct rpc_message tk_msg; /* RPC call info */ __u32 * tk_buffer; /* XDR buffer */ __u8 tk_garb_retry, tk_cred_retry, tk_suid_retry; /* * timeout_fn to be executed by timer bottom half * callback to be executed after waking up * action next procedure for async tasks * exit exit async task and report to caller */ void (*tk_timeout_fn)(struct rpc_task *); void (*tk_callback)(struct rpc_task *); void (*tk_action)(struct rpc_task *); void (*tk_exit)(struct rpc_task *); void (*tk_release)(struct rpc_task *); 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 */ wait_queue_head_t tk_wait; /* sync: sleep on this q */ unsigned long tk_timeout; /* timeout for rpc_sleep() */ unsigned short tk_flags; /* misc flags */ unsigned char tk_active : 1;/* Task has been activated */ unsigned long tk_runstate; /* Task run status */ #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, tk_list)),1) #define task_for_first(task, head) \ if (!list_empty(head) && \ ((task=list_entry((head)->next, struct rpc_task, tk_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 *); /* * RPC task flags */ #define RPC_TASK_ASYNC 0x0001 /* is an async task */ #define RPC_TASK_SWAPPER 0x0002 /* is swapping in/out */ #define RPC_TASK_SETUID 0x0004 /* is setuid process */ #define RPC_TASK_CHILD 0x0008 /* is child of other task */ #define RPC_CALL_REALUID 0x0010 /* try using real uid */ #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_IS_ASYNC(t) ((t)->tk_flags & RPC_TASK_ASYNC) #define RPC_IS_SETUID(t) ((t)->tk_flags & RPC_TASK_SETUID) #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_IS_ACTIVATED(t) ((t)->tk_active) #define RPC_DO_CALLBACK(t) ((t)->tk_callback != NULL) #define RPC_TASK_SLEEPING 0 #define RPC_TASK_RUNNING 1 #define RPC_IS_SLEEPING(t) (test_bit(RPC_TASK_SLEEPING, &(t)->tk_runstate)) #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_clear_running(t) (clear_bit(RPC_TASK_RUNNING, &(t)->tk_runstate)) #define rpc_set_sleeping(t) (set_bit(RPC_TASK_SLEEPING, &(t)->tk_runstate)) #define rpc_clear_sleeping(t) \ do { \ smp_mb__before_clear_bit(); \ clear_bit(RPC_TASK_SLEEPING, &(t)->tk_runstate); \ smp_mb__after_clear_bit(); \ } while(0) /* * RPC synchronization objects */ struct rpc_wait_queue { struct list_head tasks; #ifdef RPC_DEBUG char * name; #endif }; #ifndef RPC_DEBUG # define RPC_WAITQ_INIT(var,qname) ((struct rpc_wait_queue) {LIST_HEAD_INIT(var)}) # define RPC_WAITQ(var,qname) struct rpc_wait_queue var = RPC_WAITQ_INIT(var.tasks,qname) # define INIT_RPC_WAITQ(ptr,qname) do { \ INIT_LIST_HEAD(&(ptr)->tasks); \ } while(0) #else # define RPC_WAITQ_INIT(var,qname) ((struct rpc_wait_queue) {LIST_HEAD_INIT(var.tasks), qname}) # define RPC_WAITQ(var,qname) struct rpc_wait_queue var = RPC_WAITQ_INIT(var,qname) # define INIT_RPC_WAITQ(ptr,qname) do { \ INIT_LIST_HEAD(&(ptr)->tasks); (ptr)->name = qname; \ } while(0) #endif /* * Function prototypes */ struct rpc_task *rpc_new_task(struct rpc_clnt *, rpc_action, int flags); struct rpc_task *rpc_new_child(struct rpc_clnt *, struct rpc_task *parent); void rpc_init_task(struct rpc_task *, struct rpc_clnt *, rpc_action exitfunc, int flags); void rpc_release_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); int rpc_add_wait_queue(struct rpc_wait_queue *, struct rpc_task *); void rpc_remove_wait_queue(struct rpc_task *); void rpc_sleep_on(struct rpc_wait_queue *, struct rpc_task *, rpc_action action, rpc_action timer); void rpc_add_timer(struct rpc_task *, rpc_action); 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_allocate(unsigned int flags, unsigned int); void rpc_free(void *); int rpciod_up(void); void rpciod_down(void); void rpciod_wake_up(void); #ifdef RPC_DEBUG void rpc_show_tasks(void); #endif static __inline__ void * rpc_malloc(struct rpc_task *task, unsigned int size) { return rpc_allocate(task->tk_flags, size); } static __inline__ void rpc_exit(struct rpc_task *task, int status) { task->tk_status = status; task->tk_action = NULL; } #ifdef RPC_DEBUG static __inline__ char * rpc_qname(struct rpc_wait_queue *q) { return q->name? q->name : "unknown"; } #endif #endif /* _LINUX_SUNRPC_SCHED_H_ */