/*
|
/*
|
* linux/net/sunrpc/sched.c
|
* linux/net/sunrpc/sched.c
|
*
|
*
|
* Scheduling for synchronous and asynchronous RPC requests.
|
* Scheduling for synchronous and asynchronous RPC requests.
|
*
|
*
|
* Copyright (C) 1996 Olaf Kirch, <okir@monad.swb.de>
|
* Copyright (C) 1996 Olaf Kirch, <okir@monad.swb.de>
|
*
|
*
|
* TCP NFS related read + write fixes
|
* TCP NFS related read + write fixes
|
* (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
|
* (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
|
*/
|
*/
|
|
|
#include <linux/module.h>
|
#include <linux/module.h>
|
|
|
#define __KERNEL_SYSCALLS__
|
#define __KERNEL_SYSCALLS__
|
#include <linux/sched.h>
|
#include <linux/sched.h>
|
#include <linux/interrupt.h>
|
#include <linux/interrupt.h>
|
#include <linux/slab.h>
|
#include <linux/slab.h>
|
#include <linux/unistd.h>
|
#include <linux/unistd.h>
|
#include <linux/smp.h>
|
#include <linux/smp.h>
|
#include <linux/smp_lock.h>
|
#include <linux/smp_lock.h>
|
#include <linux/spinlock.h>
|
#include <linux/spinlock.h>
|
|
|
#include <linux/sunrpc/clnt.h>
|
#include <linux/sunrpc/clnt.h>
|
#include <linux/sunrpc/xprt.h>
|
#include <linux/sunrpc/xprt.h>
|
|
|
#ifdef RPC_DEBUG
|
#ifdef RPC_DEBUG
|
#define RPCDBG_FACILITY RPCDBG_SCHED
|
#define RPCDBG_FACILITY RPCDBG_SCHED
|
static int rpc_task_id;
|
static int rpc_task_id;
|
#endif
|
#endif
|
|
|
/*
|
/*
|
* We give RPC the same get_free_pages priority as NFS
|
* We give RPC the same get_free_pages priority as NFS
|
*/
|
*/
|
#define GFP_RPC GFP_NOFS
|
#define GFP_RPC GFP_NOFS
|
|
|
static void __rpc_default_timer(struct rpc_task *task);
|
static void __rpc_default_timer(struct rpc_task *task);
|
static void rpciod_killall(void);
|
static void rpciod_killall(void);
|
|
|
/*
|
/*
|
* When an asynchronous RPC task is activated within a bottom half
|
* When an asynchronous RPC task is activated within a bottom half
|
* handler, or while executing another RPC task, it is put on
|
* handler, or while executing another RPC task, it is put on
|
* schedq, and rpciod is woken up.
|
* schedq, and rpciod is woken up.
|
*/
|
*/
|
static RPC_WAITQ(schedq, "schedq");
|
static RPC_WAITQ(schedq, "schedq");
|
|
|
/*
|
/*
|
* RPC tasks that create another task (e.g. for contacting the portmapper)
|
* RPC tasks that create another task (e.g. for contacting the portmapper)
|
* will wait on this queue for their child's completion
|
* will wait on this queue for their child's completion
|
*/
|
*/
|
static RPC_WAITQ(childq, "childq");
|
static RPC_WAITQ(childq, "childq");
|
|
|
/*
|
/*
|
* RPC tasks sit here while waiting for conditions to improve.
|
* RPC tasks sit here while waiting for conditions to improve.
|
*/
|
*/
|
static RPC_WAITQ(delay_queue, "delayq");
|
static RPC_WAITQ(delay_queue, "delayq");
|
|
|
/*
|
/*
|
* All RPC tasks are linked into this list
|
* All RPC tasks are linked into this list
|
*/
|
*/
|
static LIST_HEAD(all_tasks);
|
static LIST_HEAD(all_tasks);
|
|
|
/*
|
/*
|
* rpciod-related stuff
|
* rpciod-related stuff
|
*/
|
*/
|
static DECLARE_WAIT_QUEUE_HEAD(rpciod_idle);
|
static DECLARE_WAIT_QUEUE_HEAD(rpciod_idle);
|
static DECLARE_WAIT_QUEUE_HEAD(rpciod_killer);
|
static DECLARE_WAIT_QUEUE_HEAD(rpciod_killer);
|
static DECLARE_MUTEX(rpciod_sema);
|
static DECLARE_MUTEX(rpciod_sema);
|
static unsigned int rpciod_users;
|
static unsigned int rpciod_users;
|
static pid_t rpciod_pid;
|
static pid_t rpciod_pid;
|
static int rpc_inhibit;
|
static int rpc_inhibit;
|
|
|
/*
|
/*
|
* Spinlock for wait queues. Access to the latter also has to be
|
* Spinlock for wait queues. Access to the latter also has to be
|
* interrupt-safe in order to allow timers to wake up sleeping tasks.
|
* interrupt-safe in order to allow timers to wake up sleeping tasks.
|
*/
|
*/
|
static spinlock_t rpc_queue_lock = SPIN_LOCK_UNLOCKED;
|
static spinlock_t rpc_queue_lock = SPIN_LOCK_UNLOCKED;
|
/*
|
/*
|
* Spinlock for other critical sections of code.
|
* Spinlock for other critical sections of code.
|
*/
|
*/
|
static spinlock_t rpc_sched_lock = SPIN_LOCK_UNLOCKED;
|
static spinlock_t rpc_sched_lock = SPIN_LOCK_UNLOCKED;
|
|
|
/*
|
/*
|
* This is the last-ditch buffer for NFS swap requests
|
* This is the last-ditch buffer for NFS swap requests
|
*/
|
*/
|
static u32 swap_buffer[PAGE_SIZE >> 2];
|
static u32 swap_buffer[PAGE_SIZE >> 2];
|
static long swap_buffer_used;
|
static long swap_buffer_used;
|
|
|
/*
|
/*
|
* Make allocation of the swap_buffer SMP-safe
|
* Make allocation of the swap_buffer SMP-safe
|
*/
|
*/
|
static __inline__ int rpc_lock_swapbuf(void)
|
static __inline__ int rpc_lock_swapbuf(void)
|
{
|
{
|
return !test_and_set_bit(1, &swap_buffer_used);
|
return !test_and_set_bit(1, &swap_buffer_used);
|
}
|
}
|
static __inline__ void rpc_unlock_swapbuf(void)
|
static __inline__ void rpc_unlock_swapbuf(void)
|
{
|
{
|
clear_bit(1, &swap_buffer_used);
|
clear_bit(1, &swap_buffer_used);
|
}
|
}
|
|
|
/*
|
/*
|
* Disable the timer for a given RPC task. Should be called with
|
* Disable the timer for a given RPC task. Should be called with
|
* rpc_queue_lock and bh_disabled in order to avoid races within
|
* rpc_queue_lock and bh_disabled in order to avoid races within
|
* rpc_run_timer().
|
* rpc_run_timer().
|
*/
|
*/
|
static inline void
|
static inline void
|
__rpc_disable_timer(struct rpc_task *task)
|
__rpc_disable_timer(struct rpc_task *task)
|
{
|
{
|
dprintk("RPC: %4d disabling timer\n", task->tk_pid);
|
dprintk("RPC: %4d disabling timer\n", task->tk_pid);
|
task->tk_timeout_fn = NULL;
|
task->tk_timeout_fn = NULL;
|
task->tk_timeout = 0;
|
task->tk_timeout = 0;
|
}
|
}
|
|
|
/*
|
/*
|
* Run a timeout function.
|
* Run a timeout function.
|
* We use the callback in order to allow __rpc_wake_up_task()
|
* We use the callback in order to allow __rpc_wake_up_task()
|
* and friends to disable the timer synchronously on SMP systems
|
* and friends to disable the timer synchronously on SMP systems
|
* without calling del_timer_sync(). The latter could cause a
|
* without calling del_timer_sync(). The latter could cause a
|
* deadlock if called while we're holding spinlocks...
|
* deadlock if called while we're holding spinlocks...
|
*/
|
*/
|
static void
|
static void
|
rpc_run_timer(struct rpc_task *task)
|
rpc_run_timer(struct rpc_task *task)
|
{
|
{
|
void (*callback)(struct rpc_task *);
|
void (*callback)(struct rpc_task *);
|
|
|
spin_lock_bh(&rpc_queue_lock);
|
spin_lock_bh(&rpc_queue_lock);
|
callback = task->tk_timeout_fn;
|
callback = task->tk_timeout_fn;
|
task->tk_timeout_fn = NULL;
|
task->tk_timeout_fn = NULL;
|
spin_unlock_bh(&rpc_queue_lock);
|
spin_unlock_bh(&rpc_queue_lock);
|
if (callback) {
|
if (callback) {
|
dprintk("RPC: %4d running timer\n", task->tk_pid);
|
dprintk("RPC: %4d running timer\n", task->tk_pid);
|
callback(task);
|
callback(task);
|
}
|
}
|
}
|
}
|
|
|
/*
|
/*
|
* Set up a timer for the current task.
|
* Set up a timer for the current task.
|
*/
|
*/
|
static inline void
|
static inline void
|
__rpc_add_timer(struct rpc_task *task, rpc_action timer)
|
__rpc_add_timer(struct rpc_task *task, rpc_action timer)
|
{
|
{
|
if (!task->tk_timeout)
|
if (!task->tk_timeout)
|
return;
|
return;
|
|
|
dprintk("RPC: %4d setting alarm for %lu ms\n",
|
dprintk("RPC: %4d setting alarm for %lu ms\n",
|
task->tk_pid, task->tk_timeout * 1000 / HZ);
|
task->tk_pid, task->tk_timeout * 1000 / HZ);
|
|
|
if (timer)
|
if (timer)
|
task->tk_timeout_fn = timer;
|
task->tk_timeout_fn = timer;
|
else
|
else
|
task->tk_timeout_fn = __rpc_default_timer;
|
task->tk_timeout_fn = __rpc_default_timer;
|
mod_timer(&task->tk_timer, jiffies + task->tk_timeout);
|
mod_timer(&task->tk_timer, jiffies + task->tk_timeout);
|
}
|
}
|
|
|
/*
|
/*
|
* Set up a timer for an already sleeping task.
|
* Set up a timer for an already sleeping task.
|
*/
|
*/
|
void rpc_add_timer(struct rpc_task *task, rpc_action timer)
|
void rpc_add_timer(struct rpc_task *task, rpc_action timer)
|
{
|
{
|
spin_lock_bh(&rpc_queue_lock);
|
spin_lock_bh(&rpc_queue_lock);
|
if (!RPC_IS_RUNNING(task))
|
if (!RPC_IS_RUNNING(task))
|
__rpc_add_timer(task, timer);
|
__rpc_add_timer(task, timer);
|
spin_unlock_bh(&rpc_queue_lock);
|
spin_unlock_bh(&rpc_queue_lock);
|
}
|
}
|
|
|
/*
|
/*
|
* Delete any timer for the current task. Because we use del_timer_sync(),
|
* Delete any timer for the current task. Because we use del_timer_sync(),
|
* this function should never be called while holding rpc_queue_lock.
|
* this function should never be called while holding rpc_queue_lock.
|
*/
|
*/
|
static inline void
|
static inline void
|
rpc_delete_timer(struct rpc_task *task)
|
rpc_delete_timer(struct rpc_task *task)
|
{
|
{
|
dprintk("RPC: %4d deleting timer\n", task->tk_pid);
|
dprintk("RPC: %4d deleting timer\n", task->tk_pid);
|
del_timer_sync(&task->tk_timer);
|
del_timer_sync(&task->tk_timer);
|
}
|
}
|
|
|
/*
|
/*
|
* Add new request to wait queue.
|
* Add new request to wait queue.
|
*
|
*
|
* Swapper tasks always get inserted at the head of the queue.
|
* Swapper tasks always get inserted at the head of the queue.
|
* This should avoid many nasty memory deadlocks and hopefully
|
* This should avoid many nasty memory deadlocks and hopefully
|
* improve overall performance.
|
* improve overall performance.
|
* Everyone else gets appended to the queue to ensure proper FIFO behavior.
|
* Everyone else gets appended to the queue to ensure proper FIFO behavior.
|
*/
|
*/
|
static inline int
|
static inline int
|
__rpc_add_wait_queue(struct rpc_wait_queue *queue, struct rpc_task *task)
|
__rpc_add_wait_queue(struct rpc_wait_queue *queue, struct rpc_task *task)
|
{
|
{
|
if (task->tk_rpcwait == queue)
|
if (task->tk_rpcwait == queue)
|
return 0;
|
return 0;
|
|
|
if (task->tk_rpcwait) {
|
if (task->tk_rpcwait) {
|
printk(KERN_WARNING "RPC: doubly enqueued task!\n");
|
printk(KERN_WARNING "RPC: doubly enqueued task!\n");
|
return -EWOULDBLOCK;
|
return -EWOULDBLOCK;
|
}
|
}
|
if (RPC_IS_SWAPPER(task))
|
if (RPC_IS_SWAPPER(task))
|
list_add(&task->tk_list, &queue->tasks);
|
list_add(&task->tk_list, &queue->tasks);
|
else
|
else
|
list_add_tail(&task->tk_list, &queue->tasks);
|
list_add_tail(&task->tk_list, &queue->tasks);
|
task->tk_rpcwait = queue;
|
task->tk_rpcwait = queue;
|
|
|
dprintk("RPC: %4d added to queue %p \"%s\"\n",
|
dprintk("RPC: %4d added to queue %p \"%s\"\n",
|
task->tk_pid, queue, rpc_qname(queue));
|
task->tk_pid, queue, rpc_qname(queue));
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
int
|
int
|
rpc_add_wait_queue(struct rpc_wait_queue *q, struct rpc_task *task)
|
rpc_add_wait_queue(struct rpc_wait_queue *q, struct rpc_task *task)
|
{
|
{
|
int result;
|
int result;
|
|
|
spin_lock_bh(&rpc_queue_lock);
|
spin_lock_bh(&rpc_queue_lock);
|
result = __rpc_add_wait_queue(q, task);
|
result = __rpc_add_wait_queue(q, task);
|
spin_unlock_bh(&rpc_queue_lock);
|
spin_unlock_bh(&rpc_queue_lock);
|
return result;
|
return result;
|
}
|
}
|
|
|
/*
|
/*
|
* Remove request from queue.
|
* Remove request from queue.
|
* Note: must be called with spin lock held.
|
* Note: must be called with spin lock held.
|
*/
|
*/
|
static inline void
|
static inline void
|
__rpc_remove_wait_queue(struct rpc_task *task)
|
__rpc_remove_wait_queue(struct rpc_task *task)
|
{
|
{
|
struct rpc_wait_queue *queue = task->tk_rpcwait;
|
struct rpc_wait_queue *queue = task->tk_rpcwait;
|
|
|
if (!queue)
|
if (!queue)
|
return;
|
return;
|
|
|
list_del(&task->tk_list);
|
list_del(&task->tk_list);
|
task->tk_rpcwait = NULL;
|
task->tk_rpcwait = NULL;
|
|
|
dprintk("RPC: %4d removed from queue %p \"%s\"\n",
|
dprintk("RPC: %4d removed from queue %p \"%s\"\n",
|
task->tk_pid, queue, rpc_qname(queue));
|
task->tk_pid, queue, rpc_qname(queue));
|
}
|
}
|
|
|
void
|
void
|
rpc_remove_wait_queue(struct rpc_task *task)
|
rpc_remove_wait_queue(struct rpc_task *task)
|
{
|
{
|
if (!task->tk_rpcwait)
|
if (!task->tk_rpcwait)
|
return;
|
return;
|
spin_lock_bh(&rpc_queue_lock);
|
spin_lock_bh(&rpc_queue_lock);
|
__rpc_remove_wait_queue(task);
|
__rpc_remove_wait_queue(task);
|
spin_unlock_bh(&rpc_queue_lock);
|
spin_unlock_bh(&rpc_queue_lock);
|
}
|
}
|
|
|
/*
|
/*
|
* Make an RPC task runnable.
|
* Make an RPC task runnable.
|
*
|
*
|
* Note: If the task is ASYNC, this must be called with
|
* Note: If the task is ASYNC, this must be called with
|
* the spinlock held to protect the wait queue operation.
|
* the spinlock held to protect the wait queue operation.
|
*/
|
*/
|
static inline void
|
static inline void
|
rpc_make_runnable(struct rpc_task *task)
|
rpc_make_runnable(struct rpc_task *task)
|
{
|
{
|
if (task->tk_timeout_fn) {
|
if (task->tk_timeout_fn) {
|
printk(KERN_ERR "RPC: task w/ running timer in rpc_make_runnable!!\n");
|
printk(KERN_ERR "RPC: task w/ running timer in rpc_make_runnable!!\n");
|
return;
|
return;
|
}
|
}
|
rpc_set_running(task);
|
rpc_set_running(task);
|
if (RPC_IS_ASYNC(task)) {
|
if (RPC_IS_ASYNC(task)) {
|
if (RPC_IS_SLEEPING(task)) {
|
if (RPC_IS_SLEEPING(task)) {
|
int status;
|
int status;
|
status = __rpc_add_wait_queue(&schedq, task);
|
status = __rpc_add_wait_queue(&schedq, task);
|
if (status < 0) {
|
if (status < 0) {
|
printk(KERN_WARNING "RPC: failed to add task to queue: error: %d!\n", status);
|
printk(KERN_WARNING "RPC: failed to add task to queue: error: %d!\n", status);
|
task->tk_status = status;
|
task->tk_status = status;
|
return;
|
return;
|
}
|
}
|
rpc_clear_sleeping(task);
|
rpc_clear_sleeping(task);
|
if (waitqueue_active(&rpciod_idle))
|
if (waitqueue_active(&rpciod_idle))
|
wake_up(&rpciod_idle);
|
wake_up(&rpciod_idle);
|
}
|
}
|
} else {
|
} else {
|
rpc_clear_sleeping(task);
|
rpc_clear_sleeping(task);
|
if (waitqueue_active(&task->tk_wait))
|
if (waitqueue_active(&task->tk_wait))
|
wake_up(&task->tk_wait);
|
wake_up(&task->tk_wait);
|
}
|
}
|
}
|
}
|
|
|
/*
|
/*
|
* Place a newly initialized task on the schedq.
|
* Place a newly initialized task on the schedq.
|
*/
|
*/
|
static inline void
|
static inline void
|
rpc_schedule_run(struct rpc_task *task)
|
rpc_schedule_run(struct rpc_task *task)
|
{
|
{
|
/* Don't run a child twice! */
|
/* Don't run a child twice! */
|
if (RPC_IS_ACTIVATED(task))
|
if (RPC_IS_ACTIVATED(task))
|
return;
|
return;
|
task->tk_active = 1;
|
task->tk_active = 1;
|
rpc_set_sleeping(task);
|
rpc_set_sleeping(task);
|
rpc_make_runnable(task);
|
rpc_make_runnable(task);
|
}
|
}
|
|
|
/*
|
/*
|
* For other people who may need to wake the I/O daemon
|
* For other people who may need to wake the I/O daemon
|
* but should (for now) know nothing about its innards
|
* but should (for now) know nothing about its innards
|
*/
|
*/
|
void rpciod_wake_up(void)
|
void rpciod_wake_up(void)
|
{
|
{
|
if(rpciod_pid==0)
|
if(rpciod_pid==0)
|
printk(KERN_ERR "rpciod: wot no daemon?\n");
|
printk(KERN_ERR "rpciod: wot no daemon?\n");
|
if (waitqueue_active(&rpciod_idle))
|
if (waitqueue_active(&rpciod_idle))
|
wake_up(&rpciod_idle);
|
wake_up(&rpciod_idle);
|
}
|
}
|
|
|
/*
|
/*
|
* Prepare for sleeping on a wait queue.
|
* Prepare for sleeping on a wait queue.
|
* By always appending tasks to the list we ensure FIFO behavior.
|
* By always appending tasks to the list we ensure FIFO behavior.
|
* NB: An RPC task will only receive interrupt-driven events as long
|
* NB: An RPC task will only receive interrupt-driven events as long
|
* as it's on a wait queue.
|
* as it's on a wait queue.
|
*/
|
*/
|
static void
|
static void
|
__rpc_sleep_on(struct rpc_wait_queue *q, struct rpc_task *task,
|
__rpc_sleep_on(struct rpc_wait_queue *q, struct rpc_task *task,
|
rpc_action action, rpc_action timer)
|
rpc_action action, rpc_action timer)
|
{
|
{
|
int status;
|
int status;
|
|
|
dprintk("RPC: %4d sleep_on(queue \"%s\" time %ld)\n", task->tk_pid,
|
dprintk("RPC: %4d sleep_on(queue \"%s\" time %ld)\n", task->tk_pid,
|
rpc_qname(q), jiffies);
|
rpc_qname(q), jiffies);
|
|
|
if (!RPC_IS_ASYNC(task) && !RPC_IS_ACTIVATED(task)) {
|
if (!RPC_IS_ASYNC(task) && !RPC_IS_ACTIVATED(task)) {
|
printk(KERN_ERR "RPC: Inactive synchronous task put to sleep!\n");
|
printk(KERN_ERR "RPC: Inactive synchronous task put to sleep!\n");
|
return;
|
return;
|
}
|
}
|
|
|
/* Mark the task as being activated if so needed */
|
/* Mark the task as being activated if so needed */
|
if (!RPC_IS_ACTIVATED(task)) {
|
if (!RPC_IS_ACTIVATED(task)) {
|
task->tk_active = 1;
|
task->tk_active = 1;
|
rpc_set_sleeping(task);
|
rpc_set_sleeping(task);
|
}
|
}
|
|
|
status = __rpc_add_wait_queue(q, task);
|
status = __rpc_add_wait_queue(q, task);
|
if (status) {
|
if (status) {
|
printk(KERN_WARNING "RPC: failed to add task to queue: error: %d!\n", status);
|
printk(KERN_WARNING "RPC: failed to add task to queue: error: %d!\n", status);
|
task->tk_status = status;
|
task->tk_status = status;
|
} else {
|
} else {
|
rpc_clear_running(task);
|
rpc_clear_running(task);
|
if (task->tk_callback) {
|
if (task->tk_callback) {
|
dprintk(KERN_ERR "RPC: %4d overwrites an active callback\n", task->tk_pid);
|
dprintk(KERN_ERR "RPC: %4d overwrites an active callback\n", task->tk_pid);
|
BUG();
|
BUG();
|
}
|
}
|
task->tk_callback = action;
|
task->tk_callback = action;
|
__rpc_add_timer(task, timer);
|
__rpc_add_timer(task, timer);
|
}
|
}
|
}
|
}
|
|
|
void
|
void
|
rpc_sleep_on(struct rpc_wait_queue *q, struct rpc_task *task,
|
rpc_sleep_on(struct rpc_wait_queue *q, struct rpc_task *task,
|
rpc_action action, rpc_action timer)
|
rpc_action action, rpc_action timer)
|
{
|
{
|
/*
|
/*
|
* Protect the queue operations.
|
* Protect the queue operations.
|
*/
|
*/
|
spin_lock_bh(&rpc_queue_lock);
|
spin_lock_bh(&rpc_queue_lock);
|
__rpc_sleep_on(q, task, action, timer);
|
__rpc_sleep_on(q, task, action, timer);
|
spin_unlock_bh(&rpc_queue_lock);
|
spin_unlock_bh(&rpc_queue_lock);
|
}
|
}
|
|
|
/**
|
/**
|
* __rpc_wake_up_task - wake up a single rpc_task
|
* __rpc_wake_up_task - wake up a single rpc_task
|
* @task: task to be woken up
|
* @task: task to be woken up
|
*
|
*
|
* Caller must hold rpc_queue_lock
|
* Caller must hold rpc_queue_lock
|
*/
|
*/
|
static void
|
static void
|
__rpc_wake_up_task(struct rpc_task *task)
|
__rpc_wake_up_task(struct rpc_task *task)
|
{
|
{
|
dprintk("RPC: %4d __rpc_wake_up_task (now %ld inh %d)\n",
|
dprintk("RPC: %4d __rpc_wake_up_task (now %ld inh %d)\n",
|
task->tk_pid, jiffies, rpc_inhibit);
|
task->tk_pid, jiffies, rpc_inhibit);
|
|
|
#ifdef RPC_DEBUG
|
#ifdef RPC_DEBUG
|
if (task->tk_magic != 0xf00baa) {
|
if (task->tk_magic != 0xf00baa) {
|
printk(KERN_ERR "RPC: attempt to wake up non-existing task!\n");
|
printk(KERN_ERR "RPC: attempt to wake up non-existing task!\n");
|
rpc_debug = ~0;
|
rpc_debug = ~0;
|
rpc_show_tasks();
|
rpc_show_tasks();
|
return;
|
return;
|
}
|
}
|
#endif
|
#endif
|
/* Has the task been executed yet? If not, we cannot wake it up! */
|
/* Has the task been executed yet? If not, we cannot wake it up! */
|
if (!RPC_IS_ACTIVATED(task)) {
|
if (!RPC_IS_ACTIVATED(task)) {
|
printk(KERN_ERR "RPC: Inactive task (%p) being woken up!\n", task);
|
printk(KERN_ERR "RPC: Inactive task (%p) being woken up!\n", task);
|
return;
|
return;
|
}
|
}
|
if (RPC_IS_RUNNING(task))
|
if (RPC_IS_RUNNING(task))
|
return;
|
return;
|
|
|
__rpc_disable_timer(task);
|
__rpc_disable_timer(task);
|
if (task->tk_rpcwait != &schedq)
|
if (task->tk_rpcwait != &schedq)
|
__rpc_remove_wait_queue(task);
|
__rpc_remove_wait_queue(task);
|
|
|
rpc_make_runnable(task);
|
rpc_make_runnable(task);
|
|
|
dprintk("RPC: __rpc_wake_up_task done\n");
|
dprintk("RPC: __rpc_wake_up_task done\n");
|
}
|
}
|
|
|
/*
|
/*
|
* Default timeout handler if none specified by user
|
* Default timeout handler if none specified by user
|
*/
|
*/
|
static void
|
static void
|
__rpc_default_timer(struct rpc_task *task)
|
__rpc_default_timer(struct rpc_task *task)
|
{
|
{
|
dprintk("RPC: %d timeout (default timer)\n", task->tk_pid);
|
dprintk("RPC: %d timeout (default timer)\n", task->tk_pid);
|
task->tk_status = -ETIMEDOUT;
|
task->tk_status = -ETIMEDOUT;
|
rpc_wake_up_task(task);
|
rpc_wake_up_task(task);
|
}
|
}
|
|
|
/*
|
/*
|
* Wake up the specified task
|
* Wake up the specified task
|
*/
|
*/
|
void
|
void
|
rpc_wake_up_task(struct rpc_task *task)
|
rpc_wake_up_task(struct rpc_task *task)
|
{
|
{
|
if (RPC_IS_RUNNING(task))
|
if (RPC_IS_RUNNING(task))
|
return;
|
return;
|
spin_lock_bh(&rpc_queue_lock);
|
spin_lock_bh(&rpc_queue_lock);
|
__rpc_wake_up_task(task);
|
__rpc_wake_up_task(task);
|
spin_unlock_bh(&rpc_queue_lock);
|
spin_unlock_bh(&rpc_queue_lock);
|
}
|
}
|
|
|
/*
|
/*
|
* Wake up the next task on the wait queue.
|
* Wake up the next task on the wait queue.
|
*/
|
*/
|
struct rpc_task *
|
struct rpc_task *
|
rpc_wake_up_next(struct rpc_wait_queue *queue)
|
rpc_wake_up_next(struct rpc_wait_queue *queue)
|
{
|
{
|
struct rpc_task *task = NULL;
|
struct rpc_task *task = NULL;
|
|
|
dprintk("RPC: wake_up_next(%p \"%s\")\n", queue, rpc_qname(queue));
|
dprintk("RPC: wake_up_next(%p \"%s\")\n", queue, rpc_qname(queue));
|
spin_lock_bh(&rpc_queue_lock);
|
spin_lock_bh(&rpc_queue_lock);
|
task_for_first(task, &queue->tasks)
|
task_for_first(task, &queue->tasks)
|
__rpc_wake_up_task(task);
|
__rpc_wake_up_task(task);
|
spin_unlock_bh(&rpc_queue_lock);
|
spin_unlock_bh(&rpc_queue_lock);
|
|
|
return task;
|
return task;
|
}
|
}
|
|
|
/**
|
/**
|
* rpc_wake_up - wake up all rpc_tasks
|
* rpc_wake_up - wake up all rpc_tasks
|
* @queue: rpc_wait_queue on which the tasks are sleeping
|
* @queue: rpc_wait_queue on which the tasks are sleeping
|
*
|
*
|
* Grabs rpc_queue_lock
|
* Grabs rpc_queue_lock
|
*/
|
*/
|
void
|
void
|
rpc_wake_up(struct rpc_wait_queue *queue)
|
rpc_wake_up(struct rpc_wait_queue *queue)
|
{
|
{
|
struct rpc_task *task;
|
struct rpc_task *task;
|
|
|
spin_lock_bh(&rpc_queue_lock);
|
spin_lock_bh(&rpc_queue_lock);
|
while (!list_empty(&queue->tasks))
|
while (!list_empty(&queue->tasks))
|
task_for_first(task, &queue->tasks)
|
task_for_first(task, &queue->tasks)
|
__rpc_wake_up_task(task);
|
__rpc_wake_up_task(task);
|
spin_unlock_bh(&rpc_queue_lock);
|
spin_unlock_bh(&rpc_queue_lock);
|
}
|
}
|
|
|
/**
|
/**
|
* rpc_wake_up_status - wake up all rpc_tasks and set their status value.
|
* rpc_wake_up_status - wake up all rpc_tasks and set their status value.
|
* @queue: rpc_wait_queue on which the tasks are sleeping
|
* @queue: rpc_wait_queue on which the tasks are sleeping
|
* @status: status value to set
|
* @status: status value to set
|
*
|
*
|
* Grabs rpc_queue_lock
|
* Grabs rpc_queue_lock
|
*/
|
*/
|
void
|
void
|
rpc_wake_up_status(struct rpc_wait_queue *queue, int status)
|
rpc_wake_up_status(struct rpc_wait_queue *queue, int status)
|
{
|
{
|
struct rpc_task *task;
|
struct rpc_task *task;
|
|
|
spin_lock_bh(&rpc_queue_lock);
|
spin_lock_bh(&rpc_queue_lock);
|
while (!list_empty(&queue->tasks)) {
|
while (!list_empty(&queue->tasks)) {
|
task_for_first(task, &queue->tasks) {
|
task_for_first(task, &queue->tasks) {
|
task->tk_status = status;
|
task->tk_status = status;
|
__rpc_wake_up_task(task);
|
__rpc_wake_up_task(task);
|
}
|
}
|
}
|
}
|
spin_unlock_bh(&rpc_queue_lock);
|
spin_unlock_bh(&rpc_queue_lock);
|
}
|
}
|
|
|
/*
|
/*
|
* Run a task at a later time
|
* Run a task at a later time
|
*/
|
*/
|
static void __rpc_atrun(struct rpc_task *);
|
static void __rpc_atrun(struct rpc_task *);
|
void
|
void
|
rpc_delay(struct rpc_task *task, unsigned long delay)
|
rpc_delay(struct rpc_task *task, unsigned long delay)
|
{
|
{
|
task->tk_timeout = delay;
|
task->tk_timeout = delay;
|
rpc_sleep_on(&delay_queue, task, NULL, __rpc_atrun);
|
rpc_sleep_on(&delay_queue, task, NULL, __rpc_atrun);
|
}
|
}
|
|
|
static void
|
static void
|
__rpc_atrun(struct rpc_task *task)
|
__rpc_atrun(struct rpc_task *task)
|
{
|
{
|
task->tk_status = 0;
|
task->tk_status = 0;
|
rpc_wake_up_task(task);
|
rpc_wake_up_task(task);
|
}
|
}
|
|
|
/*
|
/*
|
* This is the RPC `scheduler' (or rather, the finite state machine).
|
* This is the RPC `scheduler' (or rather, the finite state machine).
|
*/
|
*/
|
static int
|
static int
|
__rpc_execute(struct rpc_task *task)
|
__rpc_execute(struct rpc_task *task)
|
{
|
{
|
int status = 0;
|
int status = 0;
|
|
|
dprintk("RPC: %4d rpc_execute flgs %x\n",
|
dprintk("RPC: %4d rpc_execute flgs %x\n",
|
task->tk_pid, task->tk_flags);
|
task->tk_pid, task->tk_flags);
|
|
|
if (!RPC_IS_RUNNING(task)) {
|
if (!RPC_IS_RUNNING(task)) {
|
printk(KERN_WARNING "RPC: rpc_execute called for sleeping task!!\n");
|
printk(KERN_WARNING "RPC: rpc_execute called for sleeping task!!\n");
|
return 0;
|
return 0;
|
}
|
}
|
|
|
restarted:
|
restarted:
|
while (1) {
|
while (1) {
|
/*
|
/*
|
* Execute any pending callback.
|
* Execute any pending callback.
|
*/
|
*/
|
if (RPC_DO_CALLBACK(task)) {
|
if (RPC_DO_CALLBACK(task)) {
|
/* Define a callback save pointer */
|
/* Define a callback save pointer */
|
void (*save_callback)(struct rpc_task *);
|
void (*save_callback)(struct rpc_task *);
|
|
|
/*
|
/*
|
* If a callback exists, save it, reset it,
|
* If a callback exists, save it, reset it,
|
* call it.
|
* call it.
|
* The save is needed to stop from resetting
|
* The save is needed to stop from resetting
|
* another callback set within the callback handler
|
* another callback set within the callback handler
|
* - Dave
|
* - Dave
|
*/
|
*/
|
save_callback=task->tk_callback;
|
save_callback=task->tk_callback;
|
task->tk_callback=NULL;
|
task->tk_callback=NULL;
|
save_callback(task);
|
save_callback(task);
|
}
|
}
|
|
|
/*
|
/*
|
* Perform the next FSM step.
|
* Perform the next FSM step.
|
* tk_action may be NULL when the task has been killed
|
* tk_action may be NULL when the task has been killed
|
* by someone else.
|
* by someone else.
|
*/
|
*/
|
if (RPC_IS_RUNNING(task)) {
|
if (RPC_IS_RUNNING(task)) {
|
/*
|
/*
|
* Garbage collection of pending timers...
|
* Garbage collection of pending timers...
|
*/
|
*/
|
rpc_delete_timer(task);
|
rpc_delete_timer(task);
|
if (!task->tk_action)
|
if (!task->tk_action)
|
break;
|
break;
|
task->tk_action(task);
|
task->tk_action(task);
|
}
|
}
|
|
|
/*
|
/*
|
* Check whether task is sleeping.
|
* Check whether task is sleeping.
|
*/
|
*/
|
spin_lock_bh(&rpc_queue_lock);
|
spin_lock_bh(&rpc_queue_lock);
|
if (!RPC_IS_RUNNING(task)) {
|
if (!RPC_IS_RUNNING(task)) {
|
rpc_set_sleeping(task);
|
rpc_set_sleeping(task);
|
if (RPC_IS_ASYNC(task)) {
|
if (RPC_IS_ASYNC(task)) {
|
spin_unlock_bh(&rpc_queue_lock);
|
spin_unlock_bh(&rpc_queue_lock);
|
return 0;
|
return 0;
|
}
|
}
|
}
|
}
|
spin_unlock_bh(&rpc_queue_lock);
|
spin_unlock_bh(&rpc_queue_lock);
|
|
|
while (RPC_IS_SLEEPING(task)) {
|
while (RPC_IS_SLEEPING(task)) {
|
/* sync task: sleep here */
|
/* sync task: sleep here */
|
dprintk("RPC: %4d sync task going to sleep\n",
|
dprintk("RPC: %4d sync task going to sleep\n",
|
task->tk_pid);
|
task->tk_pid);
|
if (current->pid == rpciod_pid)
|
if (current->pid == rpciod_pid)
|
printk(KERN_ERR "RPC: rpciod waiting on sync task!\n");
|
printk(KERN_ERR "RPC: rpciod waiting on sync task!\n");
|
|
|
__wait_event(task->tk_wait, !RPC_IS_SLEEPING(task));
|
__wait_event(task->tk_wait, !RPC_IS_SLEEPING(task));
|
dprintk("RPC: %4d sync task resuming\n", task->tk_pid);
|
dprintk("RPC: %4d sync task resuming\n", task->tk_pid);
|
|
|
/*
|
/*
|
* When a sync task receives a signal, it exits with
|
* When a sync task receives a signal, it exits with
|
* -ERESTARTSYS. In order to catch any callbacks that
|
* -ERESTARTSYS. In order to catch any callbacks that
|
* clean up after sleeping on some queue, we don't
|
* clean up after sleeping on some queue, we don't
|
* break the loop here, but go around once more.
|
* break the loop here, but go around once more.
|
*/
|
*/
|
if (task->tk_client->cl_intr && signalled()) {
|
if (task->tk_client->cl_intr && signalled()) {
|
dprintk("RPC: %4d got signal\n", task->tk_pid);
|
dprintk("RPC: %4d got signal\n", task->tk_pid);
|
task->tk_flags |= RPC_TASK_KILLED;
|
task->tk_flags |= RPC_TASK_KILLED;
|
rpc_exit(task, -ERESTARTSYS);
|
rpc_exit(task, -ERESTARTSYS);
|
rpc_wake_up_task(task);
|
rpc_wake_up_task(task);
|
}
|
}
|
}
|
}
|
}
|
}
|
|
|
if (task->tk_exit) {
|
if (task->tk_exit) {
|
task->tk_exit(task);
|
task->tk_exit(task);
|
/* If tk_action is non-null, the user wants us to restart */
|
/* If tk_action is non-null, the user wants us to restart */
|
if (task->tk_action) {
|
if (task->tk_action) {
|
if (!RPC_ASSASSINATED(task)) {
|
if (!RPC_ASSASSINATED(task)) {
|
/* Release RPC slot and buffer memory */
|
/* Release RPC slot and buffer memory */
|
if (task->tk_rqstp)
|
if (task->tk_rqstp)
|
xprt_release(task);
|
xprt_release(task);
|
if (task->tk_buffer) {
|
if (task->tk_buffer) {
|
rpc_free(task->tk_buffer);
|
rpc_free(task->tk_buffer);
|
task->tk_buffer = NULL;
|
task->tk_buffer = NULL;
|
}
|
}
|
goto restarted;
|
goto restarted;
|
}
|
}
|
printk(KERN_ERR "RPC: dead task tries to walk away.\n");
|
printk(KERN_ERR "RPC: dead task tries to walk away.\n");
|
}
|
}
|
}
|
}
|
|
|
dprintk("RPC: %4d exit() = %d\n", task->tk_pid, task->tk_status);
|
dprintk("RPC: %4d exit() = %d\n", task->tk_pid, task->tk_status);
|
status = task->tk_status;
|
status = task->tk_status;
|
|
|
/* Release all resources associated with the task */
|
/* Release all resources associated with the task */
|
rpc_release_task(task);
|
rpc_release_task(task);
|
|
|
return status;
|
return status;
|
}
|
}
|
|
|
/*
|
/*
|
* User-visible entry point to the scheduler.
|
* User-visible entry point to the scheduler.
|
*
|
*
|
* This may be called recursively if e.g. an async NFS task updates
|
* This may be called recursively if e.g. an async NFS task updates
|
* the attributes and finds that dirty pages must be flushed.
|
* the attributes and finds that dirty pages must be flushed.
|
* NOTE: Upon exit of this function the task is guaranteed to be
|
* NOTE: Upon exit of this function the task is guaranteed to be
|
* released. In particular note that tk_release() will have
|
* released. In particular note that tk_release() will have
|
* been called, so your task memory may have been freed.
|
* been called, so your task memory may have been freed.
|
*/
|
*/
|
int
|
int
|
rpc_execute(struct rpc_task *task)
|
rpc_execute(struct rpc_task *task)
|
{
|
{
|
int status = -EIO;
|
int status = -EIO;
|
if (rpc_inhibit) {
|
if (rpc_inhibit) {
|
printk(KERN_INFO "RPC: execution inhibited!\n");
|
printk(KERN_INFO "RPC: execution inhibited!\n");
|
goto out_release;
|
goto out_release;
|
}
|
}
|
|
|
status = -EWOULDBLOCK;
|
status = -EWOULDBLOCK;
|
if (task->tk_active) {
|
if (task->tk_active) {
|
printk(KERN_ERR "RPC: active task was run twice!\n");
|
printk(KERN_ERR "RPC: active task was run twice!\n");
|
goto out_err;
|
goto out_err;
|
}
|
}
|
|
|
task->tk_active = 1;
|
task->tk_active = 1;
|
rpc_set_running(task);
|
rpc_set_running(task);
|
return __rpc_execute(task);
|
return __rpc_execute(task);
|
out_release:
|
out_release:
|
rpc_release_task(task);
|
rpc_release_task(task);
|
out_err:
|
out_err:
|
return status;
|
return status;
|
}
|
}
|
|
|
/*
|
/*
|
* This is our own little scheduler for async RPC tasks.
|
* This is our own little scheduler for async RPC tasks.
|
*/
|
*/
|
static void
|
static void
|
__rpc_schedule(void)
|
__rpc_schedule(void)
|
{
|
{
|
struct rpc_task *task;
|
struct rpc_task *task;
|
int count = 0;
|
int count = 0;
|
|
|
dprintk("RPC: rpc_schedule enter\n");
|
dprintk("RPC: rpc_schedule enter\n");
|
while (1) {
|
while (1) {
|
spin_lock_bh(&rpc_queue_lock);
|
spin_lock_bh(&rpc_queue_lock);
|
|
|
task_for_first(task, &schedq.tasks) {
|
task_for_first(task, &schedq.tasks) {
|
__rpc_remove_wait_queue(task);
|
__rpc_remove_wait_queue(task);
|
spin_unlock_bh(&rpc_queue_lock);
|
spin_unlock_bh(&rpc_queue_lock);
|
|
|
__rpc_execute(task);
|
__rpc_execute(task);
|
} else {
|
} else {
|
spin_unlock_bh(&rpc_queue_lock);
|
spin_unlock_bh(&rpc_queue_lock);
|
break;
|
break;
|
}
|
}
|
|
|
if (++count >= 200 || current->need_resched) {
|
if (++count >= 200 || current->need_resched) {
|
count = 0;
|
count = 0;
|
schedule();
|
schedule();
|
}
|
}
|
}
|
}
|
dprintk("RPC: rpc_schedule leave\n");
|
dprintk("RPC: rpc_schedule leave\n");
|
}
|
}
|
|
|
/*
|
/*
|
* Allocate memory for RPC purpose.
|
* Allocate memory for RPC purpose.
|
*
|
*
|
* This is yet another tricky issue: For sync requests issued by
|
* This is yet another tricky issue: For sync requests issued by
|
* a user process, we want to make kmalloc sleep if there isn't
|
* a user process, we want to make kmalloc sleep if there isn't
|
* enough memory. Async requests should not sleep too excessively
|
* enough memory. Async requests should not sleep too excessively
|
* because that will block rpciod (but that's not dramatic when
|
* because that will block rpciod (but that's not dramatic when
|
* it's starved of memory anyway). Finally, swapout requests should
|
* it's starved of memory anyway). Finally, swapout requests should
|
* never sleep at all, and should not trigger another swap_out
|
* never sleep at all, and should not trigger another swap_out
|
* request through kmalloc which would just increase memory contention.
|
* request through kmalloc which would just increase memory contention.
|
*
|
*
|
* I hope the following gets it right, which gives async requests
|
* I hope the following gets it right, which gives async requests
|
* a slight advantage over sync requests (good for writeback, debatable
|
* a slight advantage over sync requests (good for writeback, debatable
|
* for readahead):
|
* for readahead):
|
*
|
*
|
* sync user requests: GFP_KERNEL
|
* sync user requests: GFP_KERNEL
|
* async requests: GFP_RPC (== GFP_NOFS)
|
* async requests: GFP_RPC (== GFP_NOFS)
|
* swap requests: GFP_ATOMIC (or new GFP_SWAPPER)
|
* swap requests: GFP_ATOMIC (or new GFP_SWAPPER)
|
*/
|
*/
|
void *
|
void *
|
rpc_allocate(unsigned int flags, unsigned int size)
|
rpc_allocate(unsigned int flags, unsigned int size)
|
{
|
{
|
u32 *buffer;
|
u32 *buffer;
|
int gfp;
|
int gfp;
|
|
|
if (flags & RPC_TASK_SWAPPER)
|
if (flags & RPC_TASK_SWAPPER)
|
gfp = GFP_ATOMIC;
|
gfp = GFP_ATOMIC;
|
else if (flags & RPC_TASK_ASYNC)
|
else if (flags & RPC_TASK_ASYNC)
|
gfp = GFP_RPC;
|
gfp = GFP_RPC;
|
else
|
else
|
gfp = GFP_KERNEL;
|
gfp = GFP_KERNEL;
|
|
|
do {
|
do {
|
if ((buffer = (u32 *) kmalloc(size, gfp)) != NULL) {
|
if ((buffer = (u32 *) kmalloc(size, gfp)) != NULL) {
|
dprintk("RPC: allocated buffer %p\n", buffer);
|
dprintk("RPC: allocated buffer %p\n", buffer);
|
return buffer;
|
return buffer;
|
}
|
}
|
if ((flags & RPC_TASK_SWAPPER) && size <= sizeof(swap_buffer)
|
if ((flags & RPC_TASK_SWAPPER) && size <= sizeof(swap_buffer)
|
&& rpc_lock_swapbuf()) {
|
&& rpc_lock_swapbuf()) {
|
dprintk("RPC: used last-ditch swap buffer\n");
|
dprintk("RPC: used last-ditch swap buffer\n");
|
return swap_buffer;
|
return swap_buffer;
|
}
|
}
|
if (flags & RPC_TASK_ASYNC)
|
if (flags & RPC_TASK_ASYNC)
|
return NULL;
|
return NULL;
|
yield();
|
yield();
|
} while (!signalled());
|
} while (!signalled());
|
|
|
return NULL;
|
return NULL;
|
}
|
}
|
|
|
void
|
void
|
rpc_free(void *buffer)
|
rpc_free(void *buffer)
|
{
|
{
|
if (buffer != swap_buffer) {
|
if (buffer != swap_buffer) {
|
kfree(buffer);
|
kfree(buffer);
|
return;
|
return;
|
}
|
}
|
rpc_unlock_swapbuf();
|
rpc_unlock_swapbuf();
|
}
|
}
|
|
|
/*
|
/*
|
* Creation and deletion of RPC task structures
|
* Creation and deletion of RPC task structures
|
*/
|
*/
|
inline void
|
inline void
|
rpc_init_task(struct rpc_task *task, struct rpc_clnt *clnt,
|
rpc_init_task(struct rpc_task *task, struct rpc_clnt *clnt,
|
rpc_action callback, int flags)
|
rpc_action callback, int flags)
|
{
|
{
|
memset(task, 0, sizeof(*task));
|
memset(task, 0, sizeof(*task));
|
init_timer(&task->tk_timer);
|
init_timer(&task->tk_timer);
|
task->tk_timer.data = (unsigned long) task;
|
task->tk_timer.data = (unsigned long) task;
|
task->tk_timer.function = (void (*)(unsigned long)) rpc_run_timer;
|
task->tk_timer.function = (void (*)(unsigned long)) rpc_run_timer;
|
task->tk_client = clnt;
|
task->tk_client = clnt;
|
task->tk_flags = flags;
|
task->tk_flags = flags;
|
task->tk_exit = callback;
|
task->tk_exit = callback;
|
init_waitqueue_head(&task->tk_wait);
|
init_waitqueue_head(&task->tk_wait);
|
if (current->uid != current->fsuid || current->gid != current->fsgid)
|
if (current->uid != current->fsuid || current->gid != current->fsgid)
|
task->tk_flags |= RPC_TASK_SETUID;
|
task->tk_flags |= RPC_TASK_SETUID;
|
|
|
/* Initialize retry counters */
|
/* Initialize retry counters */
|
task->tk_garb_retry = 2;
|
task->tk_garb_retry = 2;
|
task->tk_cred_retry = 2;
|
task->tk_cred_retry = 2;
|
task->tk_suid_retry = 1;
|
task->tk_suid_retry = 1;
|
|
|
/* Add to global list of all tasks */
|
/* Add to global list of all tasks */
|
spin_lock(&rpc_sched_lock);
|
spin_lock(&rpc_sched_lock);
|
list_add(&task->tk_task, &all_tasks);
|
list_add(&task->tk_task, &all_tasks);
|
spin_unlock(&rpc_sched_lock);
|
spin_unlock(&rpc_sched_lock);
|
|
|
if (clnt)
|
if (clnt)
|
atomic_inc(&clnt->cl_users);
|
atomic_inc(&clnt->cl_users);
|
|
|
#ifdef RPC_DEBUG
|
#ifdef RPC_DEBUG
|
task->tk_magic = 0xf00baa;
|
task->tk_magic = 0xf00baa;
|
task->tk_pid = rpc_task_id++;
|
task->tk_pid = rpc_task_id++;
|
#endif
|
#endif
|
dprintk("RPC: %4d new task procpid %d\n", task->tk_pid,
|
dprintk("RPC: %4d new task procpid %d\n", task->tk_pid,
|
current->pid);
|
current->pid);
|
}
|
}
|
|
|
static void
|
static void
|
rpc_default_free_task(struct rpc_task *task)
|
rpc_default_free_task(struct rpc_task *task)
|
{
|
{
|
dprintk("RPC: %4d freeing task\n", task->tk_pid);
|
dprintk("RPC: %4d freeing task\n", task->tk_pid);
|
rpc_free(task);
|
rpc_free(task);
|
}
|
}
|
|
|
/*
|
/*
|
* Create a new task for the specified client. We have to
|
* Create a new task for the specified client. We have to
|
* clean up after an allocation failure, as the client may
|
* clean up after an allocation failure, as the client may
|
* have specified "oneshot".
|
* have specified "oneshot".
|
*/
|
*/
|
struct rpc_task *
|
struct rpc_task *
|
rpc_new_task(struct rpc_clnt *clnt, rpc_action callback, int flags)
|
rpc_new_task(struct rpc_clnt *clnt, rpc_action callback, int flags)
|
{
|
{
|
struct rpc_task *task;
|
struct rpc_task *task;
|
|
|
task = (struct rpc_task *) rpc_allocate(flags, sizeof(*task));
|
task = (struct rpc_task *) rpc_allocate(flags, sizeof(*task));
|
if (!task)
|
if (!task)
|
goto cleanup;
|
goto cleanup;
|
|
|
rpc_init_task(task, clnt, callback, flags);
|
rpc_init_task(task, clnt, callback, flags);
|
|
|
/* Replace tk_release */
|
/* Replace tk_release */
|
task->tk_release = rpc_default_free_task;
|
task->tk_release = rpc_default_free_task;
|
|
|
dprintk("RPC: %4d allocated task\n", task->tk_pid);
|
dprintk("RPC: %4d allocated task\n", task->tk_pid);
|
task->tk_flags |= RPC_TASK_DYNAMIC;
|
task->tk_flags |= RPC_TASK_DYNAMIC;
|
out:
|
out:
|
return task;
|
return task;
|
|
|
cleanup:
|
cleanup:
|
/* Check whether to release the client */
|
/* Check whether to release the client */
|
if (clnt) {
|
if (clnt) {
|
printk("rpc_new_task: failed, users=%d, oneshot=%d\n",
|
printk("rpc_new_task: failed, users=%d, oneshot=%d\n",
|
atomic_read(&clnt->cl_users), clnt->cl_oneshot);
|
atomic_read(&clnt->cl_users), clnt->cl_oneshot);
|
atomic_inc(&clnt->cl_users); /* pretend we were used ... */
|
atomic_inc(&clnt->cl_users); /* pretend we were used ... */
|
rpc_release_client(clnt);
|
rpc_release_client(clnt);
|
}
|
}
|
goto out;
|
goto out;
|
}
|
}
|
|
|
void
|
void
|
rpc_release_task(struct rpc_task *task)
|
rpc_release_task(struct rpc_task *task)
|
{
|
{
|
dprintk("RPC: %4d release task\n", task->tk_pid);
|
dprintk("RPC: %4d release task\n", task->tk_pid);
|
|
|
#ifdef RPC_DEBUG
|
#ifdef RPC_DEBUG
|
if (task->tk_magic != 0xf00baa) {
|
if (task->tk_magic != 0xf00baa) {
|
printk(KERN_ERR "RPC: attempt to release a non-existing task!\n");
|
printk(KERN_ERR "RPC: attempt to release a non-existing task!\n");
|
rpc_debug = ~0;
|
rpc_debug = ~0;
|
rpc_show_tasks();
|
rpc_show_tasks();
|
return;
|
return;
|
}
|
}
|
#endif
|
#endif
|
|
|
/* Remove from global task list */
|
/* Remove from global task list */
|
spin_lock(&rpc_sched_lock);
|
spin_lock(&rpc_sched_lock);
|
list_del(&task->tk_task);
|
list_del(&task->tk_task);
|
spin_unlock(&rpc_sched_lock);
|
spin_unlock(&rpc_sched_lock);
|
|
|
/* Protect the execution below. */
|
/* Protect the execution below. */
|
spin_lock_bh(&rpc_queue_lock);
|
spin_lock_bh(&rpc_queue_lock);
|
|
|
/* Disable timer to prevent zombie wakeup */
|
/* Disable timer to prevent zombie wakeup */
|
__rpc_disable_timer(task);
|
__rpc_disable_timer(task);
|
|
|
/* Remove from any wait queue we're still on */
|
/* Remove from any wait queue we're still on */
|
__rpc_remove_wait_queue(task);
|
__rpc_remove_wait_queue(task);
|
|
|
task->tk_active = 0;
|
task->tk_active = 0;
|
|
|
spin_unlock_bh(&rpc_queue_lock);
|
spin_unlock_bh(&rpc_queue_lock);
|
|
|
/* Synchronously delete any running timer */
|
/* Synchronously delete any running timer */
|
rpc_delete_timer(task);
|
rpc_delete_timer(task);
|
|
|
/* Release resources */
|
/* Release resources */
|
if (task->tk_rqstp)
|
if (task->tk_rqstp)
|
xprt_release(task);
|
xprt_release(task);
|
if (task->tk_msg.rpc_cred)
|
if (task->tk_msg.rpc_cred)
|
rpcauth_unbindcred(task);
|
rpcauth_unbindcred(task);
|
if (task->tk_buffer) {
|
if (task->tk_buffer) {
|
rpc_free(task->tk_buffer);
|
rpc_free(task->tk_buffer);
|
task->tk_buffer = NULL;
|
task->tk_buffer = NULL;
|
}
|
}
|
if (task->tk_client) {
|
if (task->tk_client) {
|
rpc_release_client(task->tk_client);
|
rpc_release_client(task->tk_client);
|
task->tk_client = NULL;
|
task->tk_client = NULL;
|
}
|
}
|
|
|
#ifdef RPC_DEBUG
|
#ifdef RPC_DEBUG
|
task->tk_magic = 0;
|
task->tk_magic = 0;
|
#endif
|
#endif
|
if (task->tk_release)
|
if (task->tk_release)
|
task->tk_release(task);
|
task->tk_release(task);
|
}
|
}
|
|
|
/**
|
/**
|
* rpc_find_parent - find the parent of a child task.
|
* rpc_find_parent - find the parent of a child task.
|
* @child: child task
|
* @child: child task
|
*
|
*
|
* Checks that the parent task is still sleeping on the
|
* Checks that the parent task is still sleeping on the
|
* queue 'childq'. If so returns a pointer to the parent.
|
* queue 'childq'. If so returns a pointer to the parent.
|
* Upon failure returns NULL.
|
* Upon failure returns NULL.
|
*
|
*
|
* Caller must hold rpc_queue_lock
|
* Caller must hold rpc_queue_lock
|
*/
|
*/
|
static inline struct rpc_task *
|
static inline struct rpc_task *
|
rpc_find_parent(struct rpc_task *child)
|
rpc_find_parent(struct rpc_task *child)
|
{
|
{
|
struct rpc_task *task, *parent;
|
struct rpc_task *task, *parent;
|
struct list_head *le;
|
struct list_head *le;
|
|
|
parent = (struct rpc_task *) child->tk_calldata;
|
parent = (struct rpc_task *) child->tk_calldata;
|
task_for_each(task, le, &childq.tasks)
|
task_for_each(task, le, &childq.tasks)
|
if (task == parent)
|
if (task == parent)
|
return parent;
|
return parent;
|
|
|
return NULL;
|
return NULL;
|
}
|
}
|
|
|
static void
|
static void
|
rpc_child_exit(struct rpc_task *child)
|
rpc_child_exit(struct rpc_task *child)
|
{
|
{
|
struct rpc_task *parent;
|
struct rpc_task *parent;
|
|
|
spin_lock_bh(&rpc_queue_lock);
|
spin_lock_bh(&rpc_queue_lock);
|
if ((parent = rpc_find_parent(child)) != NULL) {
|
if ((parent = rpc_find_parent(child)) != NULL) {
|
parent->tk_status = child->tk_status;
|
parent->tk_status = child->tk_status;
|
__rpc_wake_up_task(parent);
|
__rpc_wake_up_task(parent);
|
}
|
}
|
spin_unlock_bh(&rpc_queue_lock);
|
spin_unlock_bh(&rpc_queue_lock);
|
}
|
}
|
|
|
/*
|
/*
|
* Note: rpc_new_task releases the client after a failure.
|
* Note: rpc_new_task releases the client after a failure.
|
*/
|
*/
|
struct rpc_task *
|
struct rpc_task *
|
rpc_new_child(struct rpc_clnt *clnt, struct rpc_task *parent)
|
rpc_new_child(struct rpc_clnt *clnt, struct rpc_task *parent)
|
{
|
{
|
struct rpc_task *task;
|
struct rpc_task *task;
|
|
|
task = rpc_new_task(clnt, NULL, RPC_TASK_ASYNC | RPC_TASK_CHILD);
|
task = rpc_new_task(clnt, NULL, RPC_TASK_ASYNC | RPC_TASK_CHILD);
|
if (!task)
|
if (!task)
|
goto fail;
|
goto fail;
|
task->tk_exit = rpc_child_exit;
|
task->tk_exit = rpc_child_exit;
|
task->tk_calldata = parent;
|
task->tk_calldata = parent;
|
return task;
|
return task;
|
|
|
fail:
|
fail:
|
parent->tk_status = -ENOMEM;
|
parent->tk_status = -ENOMEM;
|
return NULL;
|
return NULL;
|
}
|
}
|
|
|
void
|
void
|
rpc_run_child(struct rpc_task *task, struct rpc_task *child, rpc_action func)
|
rpc_run_child(struct rpc_task *task, struct rpc_task *child, rpc_action func)
|
{
|
{
|
spin_lock_bh(&rpc_queue_lock);
|
spin_lock_bh(&rpc_queue_lock);
|
/* N.B. Is it possible for the child to have already finished? */
|
/* N.B. Is it possible for the child to have already finished? */
|
__rpc_sleep_on(&childq, task, func, NULL);
|
__rpc_sleep_on(&childq, task, func, NULL);
|
rpc_schedule_run(child);
|
rpc_schedule_run(child);
|
spin_unlock_bh(&rpc_queue_lock);
|
spin_unlock_bh(&rpc_queue_lock);
|
}
|
}
|
|
|
/*
|
/*
|
* Kill all tasks for the given client.
|
* Kill all tasks for the given client.
|
* XXX: kill their descendants as well?
|
* XXX: kill their descendants as well?
|
*/
|
*/
|
void
|
void
|
rpc_killall_tasks(struct rpc_clnt *clnt)
|
rpc_killall_tasks(struct rpc_clnt *clnt)
|
{
|
{
|
struct rpc_task *rovr;
|
struct rpc_task *rovr;
|
struct list_head *le;
|
struct list_head *le;
|
|
|
dprintk("RPC: killing all tasks for client %p\n", clnt);
|
dprintk("RPC: killing all tasks for client %p\n", clnt);
|
|
|
/*
|
/*
|
* Spin lock all_tasks to prevent changes...
|
* Spin lock all_tasks to prevent changes...
|
*/
|
*/
|
spin_lock(&rpc_sched_lock);
|
spin_lock(&rpc_sched_lock);
|
alltask_for_each(rovr, le, &all_tasks)
|
alltask_for_each(rovr, le, &all_tasks)
|
if (!clnt || rovr->tk_client == clnt) {
|
if (!clnt || rovr->tk_client == clnt) {
|
rovr->tk_flags |= RPC_TASK_KILLED;
|
rovr->tk_flags |= RPC_TASK_KILLED;
|
rpc_exit(rovr, -EIO);
|
rpc_exit(rovr, -EIO);
|
rpc_wake_up_task(rovr);
|
rpc_wake_up_task(rovr);
|
}
|
}
|
spin_unlock(&rpc_sched_lock);
|
spin_unlock(&rpc_sched_lock);
|
}
|
}
|
|
|
static DECLARE_MUTEX_LOCKED(rpciod_running);
|
static DECLARE_MUTEX_LOCKED(rpciod_running);
|
|
|
static inline int
|
static inline int
|
rpciod_task_pending(void)
|
rpciod_task_pending(void)
|
{
|
{
|
return !list_empty(&schedq.tasks);
|
return !list_empty(&schedq.tasks);
|
}
|
}
|
|
|
|
|
/*
|
/*
|
* This is the rpciod kernel thread
|
* This is the rpciod kernel thread
|
*/
|
*/
|
static int
|
static int
|
rpciod(void *ptr)
|
rpciod(void *ptr)
|
{
|
{
|
wait_queue_head_t *assassin = (wait_queue_head_t*) ptr;
|
wait_queue_head_t *assassin = (wait_queue_head_t*) ptr;
|
int rounds = 0;
|
int rounds = 0;
|
|
|
MOD_INC_USE_COUNT;
|
MOD_INC_USE_COUNT;
|
lock_kernel();
|
lock_kernel();
|
/*
|
/*
|
* Let our maker know we're running ...
|
* Let our maker know we're running ...
|
*/
|
*/
|
rpciod_pid = current->pid;
|
rpciod_pid = current->pid;
|
up(&rpciod_running);
|
up(&rpciod_running);
|
|
|
daemonize();
|
daemonize();
|
|
|
spin_lock_irq(¤t->sigmask_lock);
|
spin_lock_irq(¤t->sigmask_lock);
|
siginitsetinv(¤t->blocked, sigmask(SIGKILL));
|
siginitsetinv(¤t->blocked, sigmask(SIGKILL));
|
recalc_sigpending(current);
|
recalc_sigpending(current);
|
spin_unlock_irq(¤t->sigmask_lock);
|
spin_unlock_irq(¤t->sigmask_lock);
|
|
|
strcpy(current->comm, "rpciod");
|
strcpy(current->comm, "rpciod");
|
|
|
dprintk("RPC: rpciod starting (pid %d)\n", rpciod_pid);
|
dprintk("RPC: rpciod starting (pid %d)\n", rpciod_pid);
|
while (rpciod_users) {
|
while (rpciod_users) {
|
if (signalled()) {
|
if (signalled()) {
|
rpciod_killall();
|
rpciod_killall();
|
flush_signals(current);
|
flush_signals(current);
|
}
|
}
|
__rpc_schedule();
|
__rpc_schedule();
|
|
|
if (++rounds >= 64) { /* safeguard */
|
if (++rounds >= 64) { /* safeguard */
|
schedule();
|
schedule();
|
rounds = 0;
|
rounds = 0;
|
}
|
}
|
|
|
if (!rpciod_task_pending()) {
|
if (!rpciod_task_pending()) {
|
dprintk("RPC: rpciod back to sleep\n");
|
dprintk("RPC: rpciod back to sleep\n");
|
wait_event_interruptible(rpciod_idle, rpciod_task_pending());
|
wait_event_interruptible(rpciod_idle, rpciod_task_pending());
|
dprintk("RPC: switch to rpciod\n");
|
dprintk("RPC: switch to rpciod\n");
|
rounds = 0;
|
rounds = 0;
|
}
|
}
|
}
|
}
|
|
|
dprintk("RPC: rpciod shutdown commences\n");
|
dprintk("RPC: rpciod shutdown commences\n");
|
if (!list_empty(&all_tasks)) {
|
if (!list_empty(&all_tasks)) {
|
printk(KERN_ERR "rpciod: active tasks at shutdown?!\n");
|
printk(KERN_ERR "rpciod: active tasks at shutdown?!\n");
|
rpciod_killall();
|
rpciod_killall();
|
}
|
}
|
|
|
rpciod_pid = 0;
|
rpciod_pid = 0;
|
wake_up(assassin);
|
wake_up(assassin);
|
|
|
dprintk("RPC: rpciod exiting\n");
|
dprintk("RPC: rpciod exiting\n");
|
MOD_DEC_USE_COUNT;
|
MOD_DEC_USE_COUNT;
|
return 0;
|
return 0;
|
}
|
}
|
|
|
static void
|
static void
|
rpciod_killall(void)
|
rpciod_killall(void)
|
{
|
{
|
unsigned long flags;
|
unsigned long flags;
|
|
|
while (!list_empty(&all_tasks)) {
|
while (!list_empty(&all_tasks)) {
|
current->sigpending = 0;
|
current->sigpending = 0;
|
rpc_killall_tasks(NULL);
|
rpc_killall_tasks(NULL);
|
__rpc_schedule();
|
__rpc_schedule();
|
if (!list_empty(&all_tasks)) {
|
if (!list_empty(&all_tasks)) {
|
dprintk("rpciod_killall: waiting for tasks to exit\n");
|
dprintk("rpciod_killall: waiting for tasks to exit\n");
|
yield();
|
yield();
|
}
|
}
|
}
|
}
|
|
|
spin_lock_irqsave(¤t->sigmask_lock, flags);
|
spin_lock_irqsave(¤t->sigmask_lock, flags);
|
recalc_sigpending(current);
|
recalc_sigpending(current);
|
spin_unlock_irqrestore(¤t->sigmask_lock, flags);
|
spin_unlock_irqrestore(¤t->sigmask_lock, flags);
|
}
|
}
|
|
|
/*
|
/*
|
* Start up the rpciod process if it's not already running.
|
* Start up the rpciod process if it's not already running.
|
*/
|
*/
|
int
|
int
|
rpciod_up(void)
|
rpciod_up(void)
|
{
|
{
|
int error = 0;
|
int error = 0;
|
|
|
MOD_INC_USE_COUNT;
|
MOD_INC_USE_COUNT;
|
down(&rpciod_sema);
|
down(&rpciod_sema);
|
dprintk("rpciod_up: pid %d, users %d\n", rpciod_pid, rpciod_users);
|
dprintk("rpciod_up: pid %d, users %d\n", rpciod_pid, rpciod_users);
|
rpciod_users++;
|
rpciod_users++;
|
if (rpciod_pid)
|
if (rpciod_pid)
|
goto out;
|
goto out;
|
/*
|
/*
|
* If there's no pid, we should be the first user.
|
* If there's no pid, we should be the first user.
|
*/
|
*/
|
if (rpciod_users > 1)
|
if (rpciod_users > 1)
|
printk(KERN_WARNING "rpciod_up: no pid, %d users??\n", rpciod_users);
|
printk(KERN_WARNING "rpciod_up: no pid, %d users??\n", rpciod_users);
|
/*
|
/*
|
* Create the rpciod thread and wait for it to start.
|
* Create the rpciod thread and wait for it to start.
|
*/
|
*/
|
error = kernel_thread(rpciod, &rpciod_killer, 0);
|
error = kernel_thread(rpciod, &rpciod_killer, 0);
|
if (error < 0) {
|
if (error < 0) {
|
printk(KERN_WARNING "rpciod_up: create thread failed, error=%d\n", error);
|
printk(KERN_WARNING "rpciod_up: create thread failed, error=%d\n", error);
|
rpciod_users--;
|
rpciod_users--;
|
goto out;
|
goto out;
|
}
|
}
|
down(&rpciod_running);
|
down(&rpciod_running);
|
error = 0;
|
error = 0;
|
out:
|
out:
|
up(&rpciod_sema);
|
up(&rpciod_sema);
|
MOD_DEC_USE_COUNT;
|
MOD_DEC_USE_COUNT;
|
return error;
|
return error;
|
}
|
}
|
|
|
void
|
void
|
rpciod_down(void)
|
rpciod_down(void)
|
{
|
{
|
unsigned long flags;
|
unsigned long flags;
|
|
|
MOD_INC_USE_COUNT;
|
MOD_INC_USE_COUNT;
|
down(&rpciod_sema);
|
down(&rpciod_sema);
|
dprintk("rpciod_down pid %d sema %d\n", rpciod_pid, rpciod_users);
|
dprintk("rpciod_down pid %d sema %d\n", rpciod_pid, rpciod_users);
|
if (rpciod_users) {
|
if (rpciod_users) {
|
if (--rpciod_users)
|
if (--rpciod_users)
|
goto out;
|
goto out;
|
} else
|
} else
|
printk(KERN_WARNING "rpciod_down: pid=%d, no users??\n", rpciod_pid);
|
printk(KERN_WARNING "rpciod_down: pid=%d, no users??\n", rpciod_pid);
|
|
|
if (!rpciod_pid) {
|
if (!rpciod_pid) {
|
dprintk("rpciod_down: Nothing to do!\n");
|
dprintk("rpciod_down: Nothing to do!\n");
|
goto out;
|
goto out;
|
}
|
}
|
|
|
kill_proc(rpciod_pid, SIGKILL, 1);
|
kill_proc(rpciod_pid, SIGKILL, 1);
|
/*
|
/*
|
* Usually rpciod will exit very quickly, so we
|
* Usually rpciod will exit very quickly, so we
|
* wait briefly before checking the process id.
|
* wait briefly before checking the process id.
|
*/
|
*/
|
current->sigpending = 0;
|
current->sigpending = 0;
|
yield();
|
yield();
|
/*
|
/*
|
* Display a message if we're going to wait longer.
|
* Display a message if we're going to wait longer.
|
*/
|
*/
|
while (rpciod_pid) {
|
while (rpciod_pid) {
|
dprintk("rpciod_down: waiting for pid %d to exit\n", rpciod_pid);
|
dprintk("rpciod_down: waiting for pid %d to exit\n", rpciod_pid);
|
if (signalled()) {
|
if (signalled()) {
|
dprintk("rpciod_down: caught signal\n");
|
dprintk("rpciod_down: caught signal\n");
|
break;
|
break;
|
}
|
}
|
interruptible_sleep_on(&rpciod_killer);
|
interruptible_sleep_on(&rpciod_killer);
|
}
|
}
|
spin_lock_irqsave(¤t->sigmask_lock, flags);
|
spin_lock_irqsave(¤t->sigmask_lock, flags);
|
recalc_sigpending(current);
|
recalc_sigpending(current);
|
spin_unlock_irqrestore(¤t->sigmask_lock, flags);
|
spin_unlock_irqrestore(¤t->sigmask_lock, flags);
|
out:
|
out:
|
up(&rpciod_sema);
|
up(&rpciod_sema);
|
MOD_DEC_USE_COUNT;
|
MOD_DEC_USE_COUNT;
|
}
|
}
|
|
|
#ifdef RPC_DEBUG
|
#ifdef RPC_DEBUG
|
void rpc_show_tasks(void)
|
void rpc_show_tasks(void)
|
{
|
{
|
struct list_head *le;
|
struct list_head *le;
|
struct rpc_task *t;
|
struct rpc_task *t;
|
|
|
spin_lock(&rpc_sched_lock);
|
spin_lock(&rpc_sched_lock);
|
if (list_empty(&all_tasks)) {
|
if (list_empty(&all_tasks)) {
|
spin_unlock(&rpc_sched_lock);
|
spin_unlock(&rpc_sched_lock);
|
return;
|
return;
|
}
|
}
|
printk("-pid- proc flgs status -client- -prog- --rqstp- -timeout "
|
printk("-pid- proc flgs status -client- -prog- --rqstp- -timeout "
|
"-rpcwait -action- --exit--\n");
|
"-rpcwait -action- --exit--\n");
|
alltask_for_each(t, le, &all_tasks)
|
alltask_for_each(t, le, &all_tasks)
|
printk("%05d %04d %04x %06d %8p %6d %8p %08ld %8s %8p %8p\n",
|
printk("%05d %04d %04x %06d %8p %6d %8p %08ld %8s %8p %8p\n",
|
t->tk_pid, t->tk_msg.rpc_proc, t->tk_flags, t->tk_status,
|
t->tk_pid, t->tk_msg.rpc_proc, t->tk_flags, t->tk_status,
|
t->tk_client, t->tk_client->cl_prog,
|
t->tk_client, t->tk_client->cl_prog,
|
t->tk_rqstp, t->tk_timeout,
|
t->tk_rqstp, t->tk_timeout,
|
t->tk_rpcwait ? rpc_qname(t->tk_rpcwait) : " <NULL> ",
|
t->tk_rpcwait ? rpc_qname(t->tk_rpcwait) : " <NULL> ",
|
t->tk_action, t->tk_exit);
|
t->tk_action, t->tk_exit);
|
spin_unlock(&rpc_sched_lock);
|
spin_unlock(&rpc_sched_lock);
|
}
|
}
|
#endif
|
#endif
|
|
|
