diff options
Diffstat (limited to 'include/linux/sunrpc/sched.h')
| -rw-r--r-- | include/linux/sunrpc/sched.h | 273 |
1 files changed, 273 insertions, 0 deletions
diff --git a/include/linux/sunrpc/sched.h b/include/linux/sunrpc/sched.h new file mode 100644 index 000000000000..99d17ed7cebb --- /dev/null +++ b/include/linux/sunrpc/sched.h @@ -0,0 +1,273 @@ +/* + * 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_wait_queue; +struct rpc_wait { + struct list_head list; /* wait queue links */ + struct list_head links; /* Links to related tasks */ + wait_queue_head_t waitq; /* sync: sleep on this q */ + 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 + 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 */ + __u32 * tk_buffer; /* XDR buffer */ + size_t tk_bufsize; + __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 + * 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 */ + unsigned long tk_timeout; /* timeout for rpc_sleep() */ + unsigned short tk_flags; /* misc flags */ + unsigned char tk_active : 1;/* Task has been activated */ + 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 *); + +/* + * 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_IS_ACTIVATED(t) ((t)->tk_active) +#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_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) + +/* + * 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 *, 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); +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); +int rpciod_up(void); +void rpciod_down(void); +void rpciod_wake_up(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 = 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_ */ |