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![Trond Myklebust](/assets/img/avatar_default.png)
Currently, the caller has to change the value of task->tk_priority if it wants to select on which priority level the task will sleep. This patch allows the caller to select a priority level at sleep time rather than always using task->tk_priority. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
276 lines
8.5 KiB
C
276 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/ktime.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_call_ops;
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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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struct list_head timer_list; /* Timer list */
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unsigned long expires;
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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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atomic_t tk_count; /* Reference count */
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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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/*
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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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/*
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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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* tk_ops caller callbacks
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*/
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void (*tk_callback)(struct rpc_task *);
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void (*tk_action)(struct rpc_task *);
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const struct rpc_call_ops *tk_ops;
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void * tk_calldata;
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unsigned long tk_timeout; /* timeout for rpc_sleep() */
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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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struct rpc_wait_queue *tk_waitqueue; /* RPC wait queue we're on */
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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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ktime_t tk_start; /* RPC task init timestamp */
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pid_t tk_owner; /* Process id for batching tasks */
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int tk_status; /* result of last operation */
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unsigned short tk_flags; /* misc flags */
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unsigned short tk_timeouts; /* maj timeouts */
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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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unsigned char tk_priority : 2,/* Task priority */
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tk_garb_retry : 2,
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tk_cred_retry : 2,
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tk_rebind_retry : 2;
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};
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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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typedef void (*rpc_action)(struct rpc_task *);
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struct rpc_call_ops {
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void (*rpc_call_prepare)(struct rpc_task *, void *);
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void (*rpc_call_done)(struct rpc_task *, void *);
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void (*rpc_release)(void *);
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};
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struct rpc_task_setup {
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struct rpc_task *task;
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struct rpc_clnt *rpc_client;
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const struct rpc_message *rpc_message;
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const struct rpc_call_ops *callback_ops;
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void *callback_data;
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struct workqueue_struct *workqueue;
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unsigned short flags;
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signed char priority;
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};
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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_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_SOFTCONN 0x0400 /* Fail if can't connect */
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#define RPC_TASK_SENT 0x0800 /* message was sent */
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#define RPC_TASK_TIMEOUT 0x1000 /* fail with ETIMEDOUT on timeout */
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#define RPC_IS_ASYNC(t) ((t)->tk_flags & RPC_TASK_ASYNC)
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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_SOFT(t) ((t)->tk_flags & (RPC_TASK_SOFT|RPC_TASK_TIMEOUT))
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#define RPC_IS_SOFTCONN(t) ((t)->tk_flags & RPC_TASK_SOFTCONN)
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#define RPC_WAS_SENT(t) ((t)->tk_flags & RPC_TASK_SENT)
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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_ACTIVE 2
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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_IS_ACTIVATED(t) test_bit(RPC_TASK_ACTIVE, &(t)->tk_runstate)
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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 (-1)
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#define RPC_PRIORITY_NORMAL (0)
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#define RPC_PRIORITY_HIGH (1)
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#define RPC_PRIORITY_PRIVILEGED (2)
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#define RPC_NR_PRIORITY (1 + RPC_PRIORITY_PRIVILEGED - RPC_PRIORITY_LOW)
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struct rpc_timer {
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struct timer_list timer;
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struct list_head list;
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unsigned long expires;
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};
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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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pid_t owner; /* process id 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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unsigned short qlen; /* total # tasks waiting in queue */
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struct rpc_timer timer_list;
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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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#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(const struct rpc_task_setup *);
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struct rpc_task *rpc_run_task(const struct rpc_task_setup *);
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struct rpc_task *rpc_run_bc_task(struct rpc_rqst *req,
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const struct rpc_call_ops *ops);
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void rpc_put_task(struct rpc_task *);
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void rpc_put_task_async(struct rpc_task *);
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void rpc_exit_task(struct rpc_task *);
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void rpc_exit(struct rpc_task *, int);
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void rpc_release_calldata(const struct rpc_call_ops *, void *);
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void rpc_killall_tasks(struct rpc_clnt *);
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void rpc_execute(struct rpc_task *);
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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_destroy_wait_queue(struct rpc_wait_queue *);
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void rpc_sleep_on(struct rpc_wait_queue *, struct rpc_task *,
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rpc_action action);
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void rpc_sleep_on_priority(struct rpc_wait_queue *,
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struct rpc_task *,
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rpc_action action,
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int priority);
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void rpc_wake_up_queued_task(struct rpc_wait_queue *,
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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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int rpc_queue_empty(struct rpc_wait_queue *);
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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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void rpc_free(void *);
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int rpciod_up(void);
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void rpciod_down(void);
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int __rpc_wait_for_completion_task(struct rpc_task *task, int (*)(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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extern struct workqueue_struct *rpciod_workqueue;
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void rpc_prepare_task(struct rpc_task *task);
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static inline int rpc_wait_for_completion_task(struct rpc_task *task)
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{
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return __rpc_wait_for_completion_task(task, NULL);
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}
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static inline void rpc_task_set_priority(struct rpc_task *task, unsigned char prio)
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{
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task->tk_priority = prio - RPC_PRIORITY_LOW;
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}
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static inline int rpc_task_has_priority(struct rpc_task *task, unsigned char prio)
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{
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return (task->tk_priority + RPC_PRIORITY_LOW == prio);
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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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