274 lines
8.5 KiB
C
274 lines
8.5 KiB
C
/*
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* linux/include/linux/sunrpc/sched.h
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*
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* Scheduling primitives for kernel Sun RPC.
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*
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* Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
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*/
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#ifndef _LINUX_SUNRPC_SCHED_H_
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#define _LINUX_SUNRPC_SCHED_H_
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#include <linux/timer.h>
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#include <linux/sunrpc/types.h>
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#include <linux/spinlock.h>
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#include <linux/wait.h>
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#include <linux/workqueue.h>
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#include <linux/sunrpc/xdr.h>
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/*
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* This is the actual RPC procedure call info.
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*/
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struct rpc_procinfo;
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struct rpc_message {
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struct rpc_procinfo * rpc_proc; /* Procedure information */
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void * rpc_argp; /* Arguments */
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void * rpc_resp; /* Result */
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struct rpc_cred * rpc_cred; /* Credentials */
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};
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struct rpc_wait_queue;
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struct rpc_wait {
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struct list_head list; /* wait queue links */
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struct list_head links; /* Links to related tasks */
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wait_queue_head_t waitq; /* sync: sleep on this q */
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struct rpc_wait_queue * rpc_waitq; /* RPC wait queue we're on */
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};
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/*
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* This is the RPC task struct
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*/
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struct rpc_task {
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#ifdef RPC_DEBUG
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unsigned long tk_magic; /* 0xf00baa */
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#endif
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struct list_head tk_task; /* global list of tasks */
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struct rpc_clnt * tk_client; /* RPC client */
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struct rpc_rqst * tk_rqstp; /* RPC request */
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int tk_status; /* result of last operation */
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/*
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* RPC call state
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*/
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struct rpc_message tk_msg; /* RPC call info */
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__u32 * tk_buffer; /* XDR buffer */
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size_t tk_bufsize;
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__u8 tk_garb_retry;
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__u8 tk_cred_retry;
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unsigned long tk_cookie; /* Cookie for batching tasks */
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/*
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* timeout_fn to be executed by timer bottom half
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* callback to be executed after waking up
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* action next procedure for async tasks
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* exit exit async task and report to caller
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*/
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void (*tk_timeout_fn)(struct rpc_task *);
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void (*tk_callback)(struct rpc_task *);
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void (*tk_action)(struct rpc_task *);
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void (*tk_exit)(struct rpc_task *);
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void (*tk_release)(struct rpc_task *);
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void * tk_calldata;
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/*
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* tk_timer is used for async processing by the RPC scheduling
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* primitives. You should not access this directly unless
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* you have a pathological interest in kernel oopses.
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*/
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struct timer_list tk_timer; /* kernel timer */
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unsigned long tk_timeout; /* timeout for rpc_sleep() */
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unsigned short tk_flags; /* misc flags */
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unsigned char tk_active : 1;/* Task has been activated */
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unsigned char tk_priority : 2;/* Task priority */
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unsigned long tk_runstate; /* Task run status */
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struct workqueue_struct *tk_workqueue; /* Normally rpciod, but could
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* be any workqueue
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*/
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union {
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struct work_struct tk_work; /* Async task work queue */
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struct rpc_wait tk_wait; /* RPC wait */
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} u;
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#ifdef RPC_DEBUG
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unsigned short tk_pid; /* debugging aid */
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#endif
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};
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#define tk_auth tk_client->cl_auth
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#define tk_xprt tk_client->cl_xprt
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/* support walking a list of tasks on a wait queue */
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#define task_for_each(task, pos, head) \
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list_for_each(pos, head) \
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if ((task=list_entry(pos, struct rpc_task, u.tk_wait.list)),1)
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#define task_for_first(task, head) \
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if (!list_empty(head) && \
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((task=list_entry((head)->next, struct rpc_task, u.tk_wait.list)),1))
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/* .. and walking list of all tasks */
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#define alltask_for_each(task, pos, head) \
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list_for_each(pos, head) \
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if ((task=list_entry(pos, struct rpc_task, tk_task)),1)
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typedef void (*rpc_action)(struct rpc_task *);
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/*
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* RPC task flags
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*/
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#define RPC_TASK_ASYNC 0x0001 /* is an async task */
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#define RPC_TASK_SWAPPER 0x0002 /* is swapping in/out */
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#define RPC_TASK_CHILD 0x0008 /* is child of other task */
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#define RPC_CALL_MAJORSEEN 0x0020 /* major timeout seen */
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#define RPC_TASK_ROOTCREDS 0x0040 /* force root creds */
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#define RPC_TASK_DYNAMIC 0x0080 /* task was kmalloc'ed */
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#define RPC_TASK_KILLED 0x0100 /* task was killed */
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#define RPC_TASK_SOFT 0x0200 /* Use soft timeouts */
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#define RPC_TASK_NOINTR 0x0400 /* uninterruptible task */
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#define RPC_IS_ASYNC(t) ((t)->tk_flags & RPC_TASK_ASYNC)
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#define RPC_IS_CHILD(t) ((t)->tk_flags & RPC_TASK_CHILD)
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#define RPC_IS_SWAPPER(t) ((t)->tk_flags & RPC_TASK_SWAPPER)
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#define RPC_DO_ROOTOVERRIDE(t) ((t)->tk_flags & RPC_TASK_ROOTCREDS)
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#define RPC_ASSASSINATED(t) ((t)->tk_flags & RPC_TASK_KILLED)
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#define RPC_IS_ACTIVATED(t) ((t)->tk_active)
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#define RPC_DO_CALLBACK(t) ((t)->tk_callback != NULL)
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#define RPC_IS_SOFT(t) ((t)->tk_flags & RPC_TASK_SOFT)
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#define RPC_TASK_UNINTERRUPTIBLE(t) ((t)->tk_flags & RPC_TASK_NOINTR)
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#define RPC_TASK_RUNNING 0
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#define RPC_TASK_QUEUED 1
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#define RPC_TASK_WAKEUP 2
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#define RPC_TASK_HAS_TIMER 3
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#define RPC_IS_RUNNING(t) (test_bit(RPC_TASK_RUNNING, &(t)->tk_runstate))
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#define rpc_set_running(t) (set_bit(RPC_TASK_RUNNING, &(t)->tk_runstate))
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#define rpc_test_and_set_running(t) \
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(test_and_set_bit(RPC_TASK_RUNNING, &(t)->tk_runstate))
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#define rpc_clear_running(t) \
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do { \
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smp_mb__before_clear_bit(); \
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clear_bit(RPC_TASK_RUNNING, &(t)->tk_runstate); \
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smp_mb__after_clear_bit(); \
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} while (0)
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#define RPC_IS_QUEUED(t) (test_bit(RPC_TASK_QUEUED, &(t)->tk_runstate))
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#define rpc_set_queued(t) (set_bit(RPC_TASK_QUEUED, &(t)->tk_runstate))
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#define rpc_clear_queued(t) \
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do { \
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smp_mb__before_clear_bit(); \
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clear_bit(RPC_TASK_QUEUED, &(t)->tk_runstate); \
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smp_mb__after_clear_bit(); \
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} while (0)
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#define rpc_start_wakeup(t) \
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(test_and_set_bit(RPC_TASK_WAKEUP, &(t)->tk_runstate) == 0)
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#define rpc_finish_wakeup(t) \
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do { \
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smp_mb__before_clear_bit(); \
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clear_bit(RPC_TASK_WAKEUP, &(t)->tk_runstate); \
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smp_mb__after_clear_bit(); \
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} while (0)
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/*
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* Task priorities.
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* Note: if you change these, you must also change
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* the task initialization definitions below.
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*/
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#define RPC_PRIORITY_LOW 0
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#define RPC_PRIORITY_NORMAL 1
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#define RPC_PRIORITY_HIGH 2
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#define RPC_NR_PRIORITY (RPC_PRIORITY_HIGH+1)
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/*
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* RPC synchronization objects
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*/
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struct rpc_wait_queue {
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spinlock_t lock;
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struct list_head tasks[RPC_NR_PRIORITY]; /* task queue for each priority level */
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unsigned long cookie; /* cookie of last task serviced */
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unsigned char maxpriority; /* maximum priority (0 if queue is not a priority queue) */
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unsigned char priority; /* current priority */
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unsigned char count; /* # task groups remaining serviced so far */
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unsigned char nr; /* # tasks remaining for cookie */
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#ifdef RPC_DEBUG
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const char * name;
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#endif
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};
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/*
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* This is the # requests to send consecutively
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* from a single cookie. The aim is to improve
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* performance of NFS operations such as read/write.
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*/
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#define RPC_BATCH_COUNT 16
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#ifndef RPC_DEBUG
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# define RPC_WAITQ_INIT(var,qname) { \
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.lock = SPIN_LOCK_UNLOCKED, \
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.tasks = { \
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[0] = LIST_HEAD_INIT(var.tasks[0]), \
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[1] = LIST_HEAD_INIT(var.tasks[1]), \
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[2] = LIST_HEAD_INIT(var.tasks[2]), \
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}, \
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}
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#else
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# define RPC_WAITQ_INIT(var,qname) { \
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.lock = SPIN_LOCK_UNLOCKED, \
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.tasks = { \
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[0] = LIST_HEAD_INIT(var.tasks[0]), \
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[1] = LIST_HEAD_INIT(var.tasks[1]), \
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[2] = LIST_HEAD_INIT(var.tasks[2]), \
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}, \
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.name = qname, \
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}
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#endif
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# define RPC_WAITQ(var,qname) struct rpc_wait_queue var = RPC_WAITQ_INIT(var,qname)
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#define RPC_IS_PRIORITY(q) ((q)->maxpriority > 0)
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/*
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* Function prototypes
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*/
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struct rpc_task *rpc_new_task(struct rpc_clnt *, rpc_action, int flags);
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struct rpc_task *rpc_new_child(struct rpc_clnt *, struct rpc_task *parent);
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void rpc_init_task(struct rpc_task *, struct rpc_clnt *,
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rpc_action exitfunc, int flags);
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void rpc_release_task(struct rpc_task *);
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void rpc_killall_tasks(struct rpc_clnt *);
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int rpc_execute(struct rpc_task *);
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void rpc_run_child(struct rpc_task *parent, struct rpc_task *child,
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rpc_action action);
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void rpc_init_priority_wait_queue(struct rpc_wait_queue *, const char *);
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void rpc_init_wait_queue(struct rpc_wait_queue *, const char *);
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void rpc_sleep_on(struct rpc_wait_queue *, struct rpc_task *,
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rpc_action action, rpc_action timer);
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void rpc_wake_up_task(struct rpc_task *);
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void rpc_wake_up(struct rpc_wait_queue *);
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struct rpc_task *rpc_wake_up_next(struct rpc_wait_queue *);
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void rpc_wake_up_status(struct rpc_wait_queue *, int);
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void rpc_delay(struct rpc_task *, unsigned long);
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void * rpc_malloc(struct rpc_task *, size_t);
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int rpciod_up(void);
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void rpciod_down(void);
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void rpciod_wake_up(void);
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#ifdef RPC_DEBUG
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void rpc_show_tasks(void);
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#endif
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int rpc_init_mempool(void);
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void rpc_destroy_mempool(void);
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static inline void rpc_exit(struct rpc_task *task, int status)
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{
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task->tk_status = status;
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task->tk_action = NULL;
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}
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#ifdef RPC_DEBUG
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static inline const char * rpc_qname(struct rpc_wait_queue *q)
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{
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return ((q && q->name) ? q->name : "unknown");
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}
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#endif
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#endif /* _LINUX_SUNRPC_SCHED_H_ */
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