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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/net/sunrpc/sched.c | |
3 | * | |
4 | * Scheduling for synchronous and asynchronous RPC requests. | |
5 | * | |
6 | * Copyright (C) 1996 Olaf Kirch, <okir@monad.swb.de> | |
cca5172a | 7 | * |
1da177e4 LT |
8 | * TCP NFS related read + write fixes |
9 | * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie> | |
10 | */ | |
11 | ||
12 | #include <linux/module.h> | |
13 | ||
14 | #include <linux/sched.h> | |
15 | #include <linux/interrupt.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/mempool.h> | |
18 | #include <linux/smp.h> | |
19 | #include <linux/smp_lock.h> | |
20 | #include <linux/spinlock.h> | |
4a3e2f71 | 21 | #include <linux/mutex.h> |
1da177e4 LT |
22 | |
23 | #include <linux/sunrpc/clnt.h> | |
1da177e4 LT |
24 | |
25 | #ifdef RPC_DEBUG | |
26 | #define RPCDBG_FACILITY RPCDBG_SCHED | |
27 | #define RPC_TASK_MAGIC_ID 0xf00baa | |
28 | static int rpc_task_id; | |
29 | #endif | |
30 | ||
31 | /* | |
32 | * RPC slabs and memory pools | |
33 | */ | |
34 | #define RPC_BUFFER_MAXSIZE (2048) | |
35 | #define RPC_BUFFER_POOLSIZE (8) | |
36 | #define RPC_TASK_POOLSIZE (8) | |
e18b890b CL |
37 | static struct kmem_cache *rpc_task_slabp __read_mostly; |
38 | static struct kmem_cache *rpc_buffer_slabp __read_mostly; | |
ba89966c ED |
39 | static mempool_t *rpc_task_mempool __read_mostly; |
40 | static mempool_t *rpc_buffer_mempool __read_mostly; | |
1da177e4 LT |
41 | |
42 | static void __rpc_default_timer(struct rpc_task *task); | |
43 | static void rpciod_killall(void); | |
65f27f38 | 44 | static void rpc_async_schedule(struct work_struct *); |
bde8f00c | 45 | static void rpc_release_task(struct rpc_task *task); |
1da177e4 | 46 | |
1da177e4 LT |
47 | /* |
48 | * RPC tasks sit here while waiting for conditions to improve. | |
49 | */ | |
50 | static RPC_WAITQ(delay_queue, "delayq"); | |
51 | ||
52 | /* | |
53 | * All RPC tasks are linked into this list | |
54 | */ | |
55 | static LIST_HEAD(all_tasks); | |
56 | ||
57 | /* | |
58 | * rpciod-related stuff | |
59 | */ | |
4a3e2f71 | 60 | static DEFINE_MUTEX(rpciod_mutex); |
1da177e4 | 61 | static unsigned int rpciod_users; |
24c5d9d7 | 62 | struct workqueue_struct *rpciod_workqueue; |
1da177e4 LT |
63 | |
64 | /* | |
65 | * Spinlock for other critical sections of code. | |
66 | */ | |
67 | static DEFINE_SPINLOCK(rpc_sched_lock); | |
68 | ||
69 | /* | |
70 | * Disable the timer for a given RPC task. Should be called with | |
71 | * queue->lock and bh_disabled in order to avoid races within | |
72 | * rpc_run_timer(). | |
73 | */ | |
74 | static inline void | |
75 | __rpc_disable_timer(struct rpc_task *task) | |
76 | { | |
46121cf7 | 77 | dprintk("RPC: %5u disabling timer\n", task->tk_pid); |
1da177e4 LT |
78 | task->tk_timeout_fn = NULL; |
79 | task->tk_timeout = 0; | |
80 | } | |
81 | ||
82 | /* | |
83 | * Run a timeout function. | |
84 | * We use the callback in order to allow __rpc_wake_up_task() | |
85 | * and friends to disable the timer synchronously on SMP systems | |
86 | * without calling del_timer_sync(). The latter could cause a | |
87 | * deadlock if called while we're holding spinlocks... | |
88 | */ | |
89 | static void rpc_run_timer(struct rpc_task *task) | |
90 | { | |
91 | void (*callback)(struct rpc_task *); | |
92 | ||
93 | callback = task->tk_timeout_fn; | |
94 | task->tk_timeout_fn = NULL; | |
95 | if (callback && RPC_IS_QUEUED(task)) { | |
46121cf7 | 96 | dprintk("RPC: %5u running timer\n", task->tk_pid); |
1da177e4 LT |
97 | callback(task); |
98 | } | |
99 | smp_mb__before_clear_bit(); | |
100 | clear_bit(RPC_TASK_HAS_TIMER, &task->tk_runstate); | |
101 | smp_mb__after_clear_bit(); | |
102 | } | |
103 | ||
104 | /* | |
105 | * Set up a timer for the current task. | |
106 | */ | |
107 | static inline void | |
108 | __rpc_add_timer(struct rpc_task *task, rpc_action timer) | |
109 | { | |
110 | if (!task->tk_timeout) | |
111 | return; | |
112 | ||
46121cf7 | 113 | dprintk("RPC: %5u setting alarm for %lu ms\n", |
1da177e4 LT |
114 | task->tk_pid, task->tk_timeout * 1000 / HZ); |
115 | ||
116 | if (timer) | |
117 | task->tk_timeout_fn = timer; | |
118 | else | |
119 | task->tk_timeout_fn = __rpc_default_timer; | |
120 | set_bit(RPC_TASK_HAS_TIMER, &task->tk_runstate); | |
121 | mod_timer(&task->tk_timer, jiffies + task->tk_timeout); | |
122 | } | |
123 | ||
124 | /* | |
125 | * Delete any timer for the current task. Because we use del_timer_sync(), | |
126 | * this function should never be called while holding queue->lock. | |
127 | */ | |
128 | static void | |
129 | rpc_delete_timer(struct rpc_task *task) | |
130 | { | |
131 | if (RPC_IS_QUEUED(task)) | |
132 | return; | |
133 | if (test_and_clear_bit(RPC_TASK_HAS_TIMER, &task->tk_runstate)) { | |
134 | del_singleshot_timer_sync(&task->tk_timer); | |
46121cf7 | 135 | dprintk("RPC: %5u deleting timer\n", task->tk_pid); |
1da177e4 LT |
136 | } |
137 | } | |
138 | ||
139 | /* | |
140 | * Add new request to a priority queue. | |
141 | */ | |
142 | static void __rpc_add_wait_queue_priority(struct rpc_wait_queue *queue, struct rpc_task *task) | |
143 | { | |
144 | struct list_head *q; | |
145 | struct rpc_task *t; | |
146 | ||
147 | INIT_LIST_HEAD(&task->u.tk_wait.links); | |
148 | q = &queue->tasks[task->tk_priority]; | |
149 | if (unlikely(task->tk_priority > queue->maxpriority)) | |
150 | q = &queue->tasks[queue->maxpriority]; | |
151 | list_for_each_entry(t, q, u.tk_wait.list) { | |
152 | if (t->tk_cookie == task->tk_cookie) { | |
153 | list_add_tail(&task->u.tk_wait.list, &t->u.tk_wait.links); | |
154 | return; | |
155 | } | |
156 | } | |
157 | list_add_tail(&task->u.tk_wait.list, q); | |
158 | } | |
159 | ||
160 | /* | |
161 | * Add new request to wait queue. | |
162 | * | |
163 | * Swapper tasks always get inserted at the head of the queue. | |
164 | * This should avoid many nasty memory deadlocks and hopefully | |
165 | * improve overall performance. | |
166 | * Everyone else gets appended to the queue to ensure proper FIFO behavior. | |
167 | */ | |
168 | static void __rpc_add_wait_queue(struct rpc_wait_queue *queue, struct rpc_task *task) | |
169 | { | |
170 | BUG_ON (RPC_IS_QUEUED(task)); | |
171 | ||
172 | if (RPC_IS_PRIORITY(queue)) | |
173 | __rpc_add_wait_queue_priority(queue, task); | |
174 | else if (RPC_IS_SWAPPER(task)) | |
175 | list_add(&task->u.tk_wait.list, &queue->tasks[0]); | |
176 | else | |
177 | list_add_tail(&task->u.tk_wait.list, &queue->tasks[0]); | |
178 | task->u.tk_wait.rpc_waitq = queue; | |
e19b63da | 179 | queue->qlen++; |
1da177e4 LT |
180 | rpc_set_queued(task); |
181 | ||
46121cf7 CL |
182 | dprintk("RPC: %5u added to queue %p \"%s\"\n", |
183 | task->tk_pid, queue, rpc_qname(queue)); | |
1da177e4 LT |
184 | } |
185 | ||
186 | /* | |
187 | * Remove request from a priority queue. | |
188 | */ | |
189 | static void __rpc_remove_wait_queue_priority(struct rpc_task *task) | |
190 | { | |
191 | struct rpc_task *t; | |
192 | ||
193 | if (!list_empty(&task->u.tk_wait.links)) { | |
194 | t = list_entry(task->u.tk_wait.links.next, struct rpc_task, u.tk_wait.list); | |
195 | list_move(&t->u.tk_wait.list, &task->u.tk_wait.list); | |
196 | list_splice_init(&task->u.tk_wait.links, &t->u.tk_wait.links); | |
197 | } | |
198 | list_del(&task->u.tk_wait.list); | |
199 | } | |
200 | ||
201 | /* | |
202 | * Remove request from queue. | |
203 | * Note: must be called with spin lock held. | |
204 | */ | |
205 | static void __rpc_remove_wait_queue(struct rpc_task *task) | |
206 | { | |
207 | struct rpc_wait_queue *queue; | |
208 | queue = task->u.tk_wait.rpc_waitq; | |
209 | ||
210 | if (RPC_IS_PRIORITY(queue)) | |
211 | __rpc_remove_wait_queue_priority(task); | |
212 | else | |
213 | list_del(&task->u.tk_wait.list); | |
e19b63da | 214 | queue->qlen--; |
46121cf7 CL |
215 | dprintk("RPC: %5u removed from queue %p \"%s\"\n", |
216 | task->tk_pid, queue, rpc_qname(queue)); | |
1da177e4 LT |
217 | } |
218 | ||
219 | static inline void rpc_set_waitqueue_priority(struct rpc_wait_queue *queue, int priority) | |
220 | { | |
221 | queue->priority = priority; | |
222 | queue->count = 1 << (priority * 2); | |
223 | } | |
224 | ||
225 | static inline void rpc_set_waitqueue_cookie(struct rpc_wait_queue *queue, unsigned long cookie) | |
226 | { | |
227 | queue->cookie = cookie; | |
228 | queue->nr = RPC_BATCH_COUNT; | |
229 | } | |
230 | ||
231 | static inline void rpc_reset_waitqueue_priority(struct rpc_wait_queue *queue) | |
232 | { | |
233 | rpc_set_waitqueue_priority(queue, queue->maxpriority); | |
234 | rpc_set_waitqueue_cookie(queue, 0); | |
235 | } | |
236 | ||
237 | static void __rpc_init_priority_wait_queue(struct rpc_wait_queue *queue, const char *qname, int maxprio) | |
238 | { | |
239 | int i; | |
240 | ||
241 | spin_lock_init(&queue->lock); | |
242 | for (i = 0; i < ARRAY_SIZE(queue->tasks); i++) | |
243 | INIT_LIST_HEAD(&queue->tasks[i]); | |
244 | queue->maxpriority = maxprio; | |
245 | rpc_reset_waitqueue_priority(queue); | |
246 | #ifdef RPC_DEBUG | |
247 | queue->name = qname; | |
248 | #endif | |
249 | } | |
250 | ||
251 | void rpc_init_priority_wait_queue(struct rpc_wait_queue *queue, const char *qname) | |
252 | { | |
253 | __rpc_init_priority_wait_queue(queue, qname, RPC_PRIORITY_HIGH); | |
254 | } | |
255 | ||
256 | void rpc_init_wait_queue(struct rpc_wait_queue *queue, const char *qname) | |
257 | { | |
258 | __rpc_init_priority_wait_queue(queue, qname, 0); | |
259 | } | |
260 | EXPORT_SYMBOL(rpc_init_wait_queue); | |
261 | ||
44c28873 TM |
262 | static int rpc_wait_bit_interruptible(void *word) |
263 | { | |
264 | if (signal_pending(current)) | |
265 | return -ERESTARTSYS; | |
266 | schedule(); | |
267 | return 0; | |
268 | } | |
269 | ||
e6b3c4db TM |
270 | static void rpc_set_active(struct rpc_task *task) |
271 | { | |
272 | if (test_and_set_bit(RPC_TASK_ACTIVE, &task->tk_runstate) != 0) | |
273 | return; | |
274 | spin_lock(&rpc_sched_lock); | |
275 | #ifdef RPC_DEBUG | |
276 | task->tk_magic = RPC_TASK_MAGIC_ID; | |
277 | task->tk_pid = rpc_task_id++; | |
278 | #endif | |
279 | /* Add to global list of all tasks */ | |
280 | list_add_tail(&task->tk_task, &all_tasks); | |
281 | spin_unlock(&rpc_sched_lock); | |
282 | } | |
283 | ||
44c28873 TM |
284 | /* |
285 | * Mark an RPC call as having completed by clearing the 'active' bit | |
286 | */ | |
e6b3c4db | 287 | static void rpc_mark_complete_task(struct rpc_task *task) |
44c28873 | 288 | { |
e6b3c4db TM |
289 | smp_mb__before_clear_bit(); |
290 | clear_bit(RPC_TASK_ACTIVE, &task->tk_runstate); | |
291 | smp_mb__after_clear_bit(); | |
44c28873 TM |
292 | wake_up_bit(&task->tk_runstate, RPC_TASK_ACTIVE); |
293 | } | |
294 | ||
295 | /* | |
296 | * Allow callers to wait for completion of an RPC call | |
297 | */ | |
298 | int __rpc_wait_for_completion_task(struct rpc_task *task, int (*action)(void *)) | |
299 | { | |
300 | if (action == NULL) | |
301 | action = rpc_wait_bit_interruptible; | |
302 | return wait_on_bit(&task->tk_runstate, RPC_TASK_ACTIVE, | |
303 | action, TASK_INTERRUPTIBLE); | |
304 | } | |
305 | EXPORT_SYMBOL(__rpc_wait_for_completion_task); | |
306 | ||
1da177e4 LT |
307 | /* |
308 | * Make an RPC task runnable. | |
309 | * | |
cca5172a | 310 | * Note: If the task is ASYNC, this must be called with |
1da177e4 LT |
311 | * the spinlock held to protect the wait queue operation. |
312 | */ | |
313 | static void rpc_make_runnable(struct rpc_task *task) | |
314 | { | |
1da177e4 | 315 | BUG_ON(task->tk_timeout_fn); |
1da177e4 | 316 | rpc_clear_queued(task); |
cc4dc59e CS |
317 | if (rpc_test_and_set_running(task)) |
318 | return; | |
319 | /* We might have raced */ | |
320 | if (RPC_IS_QUEUED(task)) { | |
321 | rpc_clear_running(task); | |
1da177e4 | 322 | return; |
cc4dc59e | 323 | } |
1da177e4 LT |
324 | if (RPC_IS_ASYNC(task)) { |
325 | int status; | |
326 | ||
65f27f38 | 327 | INIT_WORK(&task->u.tk_work, rpc_async_schedule); |
1da177e4 LT |
328 | status = queue_work(task->tk_workqueue, &task->u.tk_work); |
329 | if (status < 0) { | |
330 | printk(KERN_WARNING "RPC: failed to add task to queue: error: %d!\n", status); | |
331 | task->tk_status = status; | |
332 | return; | |
333 | } | |
334 | } else | |
96651ab3 | 335 | wake_up_bit(&task->tk_runstate, RPC_TASK_QUEUED); |
1da177e4 LT |
336 | } |
337 | ||
1da177e4 LT |
338 | /* |
339 | * Prepare for sleeping on a wait queue. | |
340 | * By always appending tasks to the list we ensure FIFO behavior. | |
341 | * NB: An RPC task will only receive interrupt-driven events as long | |
342 | * as it's on a wait queue. | |
343 | */ | |
344 | static void __rpc_sleep_on(struct rpc_wait_queue *q, struct rpc_task *task, | |
345 | rpc_action action, rpc_action timer) | |
346 | { | |
46121cf7 CL |
347 | dprintk("RPC: %5u sleep_on(queue \"%s\" time %lu)\n", |
348 | task->tk_pid, rpc_qname(q), jiffies); | |
1da177e4 LT |
349 | |
350 | if (!RPC_IS_ASYNC(task) && !RPC_IS_ACTIVATED(task)) { | |
351 | printk(KERN_ERR "RPC: Inactive synchronous task put to sleep!\n"); | |
352 | return; | |
353 | } | |
354 | ||
1da177e4 LT |
355 | __rpc_add_wait_queue(q, task); |
356 | ||
357 | BUG_ON(task->tk_callback != NULL); | |
358 | task->tk_callback = action; | |
359 | __rpc_add_timer(task, timer); | |
360 | } | |
361 | ||
362 | void rpc_sleep_on(struct rpc_wait_queue *q, struct rpc_task *task, | |
363 | rpc_action action, rpc_action timer) | |
364 | { | |
e6b3c4db TM |
365 | /* Mark the task as being activated if so needed */ |
366 | rpc_set_active(task); | |
367 | ||
1da177e4 LT |
368 | /* |
369 | * Protect the queue operations. | |
370 | */ | |
371 | spin_lock_bh(&q->lock); | |
372 | __rpc_sleep_on(q, task, action, timer); | |
373 | spin_unlock_bh(&q->lock); | |
374 | } | |
375 | ||
376 | /** | |
377 | * __rpc_do_wake_up_task - wake up a single rpc_task | |
378 | * @task: task to be woken up | |
379 | * | |
380 | * Caller must hold queue->lock, and have cleared the task queued flag. | |
381 | */ | |
382 | static void __rpc_do_wake_up_task(struct rpc_task *task) | |
383 | { | |
46121cf7 CL |
384 | dprintk("RPC: %5u __rpc_wake_up_task (now %lu)\n", |
385 | task->tk_pid, jiffies); | |
1da177e4 LT |
386 | |
387 | #ifdef RPC_DEBUG | |
388 | BUG_ON(task->tk_magic != RPC_TASK_MAGIC_ID); | |
389 | #endif | |
390 | /* Has the task been executed yet? If not, we cannot wake it up! */ | |
391 | if (!RPC_IS_ACTIVATED(task)) { | |
392 | printk(KERN_ERR "RPC: Inactive task (%p) being woken up!\n", task); | |
393 | return; | |
394 | } | |
395 | ||
396 | __rpc_disable_timer(task); | |
397 | __rpc_remove_wait_queue(task); | |
398 | ||
399 | rpc_make_runnable(task); | |
400 | ||
46121cf7 | 401 | dprintk("RPC: __rpc_wake_up_task done\n"); |
1da177e4 LT |
402 | } |
403 | ||
404 | /* | |
405 | * Wake up the specified task | |
406 | */ | |
407 | static void __rpc_wake_up_task(struct rpc_task *task) | |
408 | { | |
409 | if (rpc_start_wakeup(task)) { | |
410 | if (RPC_IS_QUEUED(task)) | |
411 | __rpc_do_wake_up_task(task); | |
412 | rpc_finish_wakeup(task); | |
413 | } | |
414 | } | |
415 | ||
416 | /* | |
417 | * Default timeout handler if none specified by user | |
418 | */ | |
419 | static void | |
420 | __rpc_default_timer(struct rpc_task *task) | |
421 | { | |
46121cf7 | 422 | dprintk("RPC: %5u timeout (default timer)\n", task->tk_pid); |
1da177e4 LT |
423 | task->tk_status = -ETIMEDOUT; |
424 | rpc_wake_up_task(task); | |
425 | } | |
426 | ||
427 | /* | |
428 | * Wake up the specified task | |
429 | */ | |
430 | void rpc_wake_up_task(struct rpc_task *task) | |
431 | { | |
8aca67f0 | 432 | rcu_read_lock_bh(); |
1da177e4 LT |
433 | if (rpc_start_wakeup(task)) { |
434 | if (RPC_IS_QUEUED(task)) { | |
435 | struct rpc_wait_queue *queue = task->u.tk_wait.rpc_waitq; | |
436 | ||
8aca67f0 TM |
437 | /* Note: we're already in a bh-safe context */ |
438 | spin_lock(&queue->lock); | |
1da177e4 | 439 | __rpc_do_wake_up_task(task); |
8aca67f0 | 440 | spin_unlock(&queue->lock); |
1da177e4 LT |
441 | } |
442 | rpc_finish_wakeup(task); | |
443 | } | |
8aca67f0 | 444 | rcu_read_unlock_bh(); |
1da177e4 LT |
445 | } |
446 | ||
447 | /* | |
448 | * Wake up the next task on a priority queue. | |
449 | */ | |
450 | static struct rpc_task * __rpc_wake_up_next_priority(struct rpc_wait_queue *queue) | |
451 | { | |
452 | struct list_head *q; | |
453 | struct rpc_task *task; | |
454 | ||
455 | /* | |
456 | * Service a batch of tasks from a single cookie. | |
457 | */ | |
458 | q = &queue->tasks[queue->priority]; | |
459 | if (!list_empty(q)) { | |
460 | task = list_entry(q->next, struct rpc_task, u.tk_wait.list); | |
461 | if (queue->cookie == task->tk_cookie) { | |
462 | if (--queue->nr) | |
463 | goto out; | |
464 | list_move_tail(&task->u.tk_wait.list, q); | |
465 | } | |
466 | /* | |
467 | * Check if we need to switch queues. | |
468 | */ | |
469 | if (--queue->count) | |
470 | goto new_cookie; | |
471 | } | |
472 | ||
473 | /* | |
474 | * Service the next queue. | |
475 | */ | |
476 | do { | |
477 | if (q == &queue->tasks[0]) | |
478 | q = &queue->tasks[queue->maxpriority]; | |
479 | else | |
480 | q = q - 1; | |
481 | if (!list_empty(q)) { | |
482 | task = list_entry(q->next, struct rpc_task, u.tk_wait.list); | |
483 | goto new_queue; | |
484 | } | |
485 | } while (q != &queue->tasks[queue->priority]); | |
486 | ||
487 | rpc_reset_waitqueue_priority(queue); | |
488 | return NULL; | |
489 | ||
490 | new_queue: | |
491 | rpc_set_waitqueue_priority(queue, (unsigned int)(q - &queue->tasks[0])); | |
492 | new_cookie: | |
493 | rpc_set_waitqueue_cookie(queue, task->tk_cookie); | |
494 | out: | |
495 | __rpc_wake_up_task(task); | |
496 | return task; | |
497 | } | |
498 | ||
499 | /* | |
500 | * Wake up the next task on the wait queue. | |
501 | */ | |
502 | struct rpc_task * rpc_wake_up_next(struct rpc_wait_queue *queue) | |
503 | { | |
504 | struct rpc_task *task = NULL; | |
505 | ||
46121cf7 CL |
506 | dprintk("RPC: wake_up_next(%p \"%s\")\n", |
507 | queue, rpc_qname(queue)); | |
8aca67f0 TM |
508 | rcu_read_lock_bh(); |
509 | spin_lock(&queue->lock); | |
1da177e4 LT |
510 | if (RPC_IS_PRIORITY(queue)) |
511 | task = __rpc_wake_up_next_priority(queue); | |
512 | else { | |
513 | task_for_first(task, &queue->tasks[0]) | |
514 | __rpc_wake_up_task(task); | |
515 | } | |
8aca67f0 TM |
516 | spin_unlock(&queue->lock); |
517 | rcu_read_unlock_bh(); | |
1da177e4 LT |
518 | |
519 | return task; | |
520 | } | |
521 | ||
522 | /** | |
523 | * rpc_wake_up - wake up all rpc_tasks | |
524 | * @queue: rpc_wait_queue on which the tasks are sleeping | |
525 | * | |
526 | * Grabs queue->lock | |
527 | */ | |
528 | void rpc_wake_up(struct rpc_wait_queue *queue) | |
529 | { | |
e6d83d55 | 530 | struct rpc_task *task, *next; |
1da177e4 | 531 | struct list_head *head; |
e6d83d55 | 532 | |
8aca67f0 TM |
533 | rcu_read_lock_bh(); |
534 | spin_lock(&queue->lock); | |
1da177e4 LT |
535 | head = &queue->tasks[queue->maxpriority]; |
536 | for (;;) { | |
e6d83d55 | 537 | list_for_each_entry_safe(task, next, head, u.tk_wait.list) |
1da177e4 | 538 | __rpc_wake_up_task(task); |
1da177e4 LT |
539 | if (head == &queue->tasks[0]) |
540 | break; | |
541 | head--; | |
542 | } | |
8aca67f0 TM |
543 | spin_unlock(&queue->lock); |
544 | rcu_read_unlock_bh(); | |
1da177e4 LT |
545 | } |
546 | ||
547 | /** | |
548 | * rpc_wake_up_status - wake up all rpc_tasks and set their status value. | |
549 | * @queue: rpc_wait_queue on which the tasks are sleeping | |
550 | * @status: status value to set | |
551 | * | |
552 | * Grabs queue->lock | |
553 | */ | |
554 | void rpc_wake_up_status(struct rpc_wait_queue *queue, int status) | |
555 | { | |
e6d83d55 | 556 | struct rpc_task *task, *next; |
1da177e4 | 557 | struct list_head *head; |
1da177e4 | 558 | |
8aca67f0 TM |
559 | rcu_read_lock_bh(); |
560 | spin_lock(&queue->lock); | |
1da177e4 LT |
561 | head = &queue->tasks[queue->maxpriority]; |
562 | for (;;) { | |
e6d83d55 | 563 | list_for_each_entry_safe(task, next, head, u.tk_wait.list) { |
1da177e4 LT |
564 | task->tk_status = status; |
565 | __rpc_wake_up_task(task); | |
566 | } | |
567 | if (head == &queue->tasks[0]) | |
568 | break; | |
569 | head--; | |
570 | } | |
8aca67f0 TM |
571 | spin_unlock(&queue->lock); |
572 | rcu_read_unlock_bh(); | |
1da177e4 LT |
573 | } |
574 | ||
8014793b TM |
575 | static void __rpc_atrun(struct rpc_task *task) |
576 | { | |
577 | rpc_wake_up_task(task); | |
578 | } | |
579 | ||
1da177e4 LT |
580 | /* |
581 | * Run a task at a later time | |
582 | */ | |
8014793b | 583 | void rpc_delay(struct rpc_task *task, unsigned long delay) |
1da177e4 LT |
584 | { |
585 | task->tk_timeout = delay; | |
586 | rpc_sleep_on(&delay_queue, task, NULL, __rpc_atrun); | |
587 | } | |
588 | ||
4ce70ada TM |
589 | /* |
590 | * Helper to call task->tk_ops->rpc_call_prepare | |
591 | */ | |
592 | static void rpc_prepare_task(struct rpc_task *task) | |
593 | { | |
6d5fcb5a | 594 | lock_kernel(); |
4ce70ada | 595 | task->tk_ops->rpc_call_prepare(task, task->tk_calldata); |
6d5fcb5a | 596 | unlock_kernel(); |
4ce70ada TM |
597 | } |
598 | ||
d05fdb0c | 599 | /* |
963d8fe5 | 600 | * Helper that calls task->tk_ops->rpc_call_done if it exists |
d05fdb0c | 601 | */ |
abbcf28f | 602 | void rpc_exit_task(struct rpc_task *task) |
d05fdb0c | 603 | { |
abbcf28f | 604 | task->tk_action = NULL; |
963d8fe5 | 605 | if (task->tk_ops->rpc_call_done != NULL) { |
6d5fcb5a | 606 | lock_kernel(); |
963d8fe5 | 607 | task->tk_ops->rpc_call_done(task, task->tk_calldata); |
6d5fcb5a | 608 | unlock_kernel(); |
d05fdb0c | 609 | if (task->tk_action != NULL) { |
abbcf28f TM |
610 | WARN_ON(RPC_ASSASSINATED(task)); |
611 | /* Always release the RPC slot and buffer memory */ | |
612 | xprt_release(task); | |
d05fdb0c TM |
613 | } |
614 | } | |
d05fdb0c | 615 | } |
abbcf28f | 616 | EXPORT_SYMBOL(rpc_exit_task); |
d05fdb0c | 617 | |
bbd5a1f9 TM |
618 | void rpc_release_calldata(const struct rpc_call_ops *ops, void *calldata) |
619 | { | |
620 | if (ops->rpc_release != NULL) { | |
621 | lock_kernel(); | |
622 | ops->rpc_release(calldata); | |
623 | unlock_kernel(); | |
624 | } | |
625 | } | |
626 | ||
1da177e4 LT |
627 | /* |
628 | * This is the RPC `scheduler' (or rather, the finite state machine). | |
629 | */ | |
2efef837 | 630 | static void __rpc_execute(struct rpc_task *task) |
1da177e4 LT |
631 | { |
632 | int status = 0; | |
633 | ||
46121cf7 CL |
634 | dprintk("RPC: %5u __rpc_execute flags=0x%x\n", |
635 | task->tk_pid, task->tk_flags); | |
1da177e4 LT |
636 | |
637 | BUG_ON(RPC_IS_QUEUED(task)); | |
638 | ||
d05fdb0c | 639 | for (;;) { |
1da177e4 LT |
640 | /* |
641 | * Garbage collection of pending timers... | |
642 | */ | |
643 | rpc_delete_timer(task); | |
644 | ||
645 | /* | |
646 | * Execute any pending callback. | |
647 | */ | |
648 | if (RPC_DO_CALLBACK(task)) { | |
649 | /* Define a callback save pointer */ | |
650 | void (*save_callback)(struct rpc_task *); | |
cca5172a YH |
651 | |
652 | /* | |
1da177e4 LT |
653 | * If a callback exists, save it, reset it, |
654 | * call it. | |
655 | * The save is needed to stop from resetting | |
656 | * another callback set within the callback handler | |
657 | * - Dave | |
658 | */ | |
659 | save_callback=task->tk_callback; | |
660 | task->tk_callback=NULL; | |
1da177e4 | 661 | save_callback(task); |
1da177e4 LT |
662 | } |
663 | ||
664 | /* | |
665 | * Perform the next FSM step. | |
666 | * tk_action may be NULL when the task has been killed | |
667 | * by someone else. | |
668 | */ | |
669 | if (!RPC_IS_QUEUED(task)) { | |
abbcf28f | 670 | if (task->tk_action == NULL) |
1da177e4 | 671 | break; |
abbcf28f | 672 | task->tk_action(task); |
1da177e4 LT |
673 | } |
674 | ||
675 | /* | |
676 | * Lockless check for whether task is sleeping or not. | |
677 | */ | |
678 | if (!RPC_IS_QUEUED(task)) | |
679 | continue; | |
680 | rpc_clear_running(task); | |
681 | if (RPC_IS_ASYNC(task)) { | |
682 | /* Careful! we may have raced... */ | |
683 | if (RPC_IS_QUEUED(task)) | |
2efef837 | 684 | return; |
1da177e4 | 685 | if (rpc_test_and_set_running(task)) |
2efef837 | 686 | return; |
1da177e4 LT |
687 | continue; |
688 | } | |
689 | ||
690 | /* sync task: sleep here */ | |
46121cf7 | 691 | dprintk("RPC: %5u sync task going to sleep\n", task->tk_pid); |
96651ab3 TM |
692 | /* Note: Caller should be using rpc_clnt_sigmask() */ |
693 | status = out_of_line_wait_on_bit(&task->tk_runstate, | |
694 | RPC_TASK_QUEUED, rpc_wait_bit_interruptible, | |
695 | TASK_INTERRUPTIBLE); | |
696 | if (status == -ERESTARTSYS) { | |
1da177e4 LT |
697 | /* |
698 | * When a sync task receives a signal, it exits with | |
699 | * -ERESTARTSYS. In order to catch any callbacks that | |
700 | * clean up after sleeping on some queue, we don't | |
701 | * break the loop here, but go around once more. | |
702 | */ | |
46121cf7 | 703 | dprintk("RPC: %5u got signal\n", task->tk_pid); |
96651ab3 TM |
704 | task->tk_flags |= RPC_TASK_KILLED; |
705 | rpc_exit(task, -ERESTARTSYS); | |
706 | rpc_wake_up_task(task); | |
1da177e4 LT |
707 | } |
708 | rpc_set_running(task); | |
46121cf7 | 709 | dprintk("RPC: %5u sync task resuming\n", task->tk_pid); |
1da177e4 LT |
710 | } |
711 | ||
46121cf7 CL |
712 | dprintk("RPC: %5u return %d, status %d\n", task->tk_pid, status, |
713 | task->tk_status); | |
1da177e4 LT |
714 | /* Release all resources associated with the task */ |
715 | rpc_release_task(task); | |
1da177e4 LT |
716 | } |
717 | ||
718 | /* | |
719 | * User-visible entry point to the scheduler. | |
720 | * | |
721 | * This may be called recursively if e.g. an async NFS task updates | |
722 | * the attributes and finds that dirty pages must be flushed. | |
723 | * NOTE: Upon exit of this function the task is guaranteed to be | |
724 | * released. In particular note that tk_release() will have | |
725 | * been called, so your task memory may have been freed. | |
726 | */ | |
2efef837 | 727 | void rpc_execute(struct rpc_task *task) |
1da177e4 | 728 | { |
44c28873 | 729 | rpc_set_active(task); |
1da177e4 | 730 | rpc_set_running(task); |
2efef837 | 731 | __rpc_execute(task); |
1da177e4 LT |
732 | } |
733 | ||
65f27f38 | 734 | static void rpc_async_schedule(struct work_struct *work) |
1da177e4 | 735 | { |
65f27f38 | 736 | __rpc_execute(container_of(work, struct rpc_task, u.tk_work)); |
1da177e4 LT |
737 | } |
738 | ||
02107148 CL |
739 | /** |
740 | * rpc_malloc - allocate an RPC buffer | |
741 | * @task: RPC task that will use this buffer | |
742 | * @size: requested byte size | |
1da177e4 | 743 | * |
c5a4dd8b CL |
744 | * To prevent rpciod from hanging, this allocator never sleeps, |
745 | * returning NULL if the request cannot be serviced immediately. | |
746 | * The caller can arrange to sleep in a way that is safe for rpciod. | |
747 | * | |
748 | * Most requests are 'small' (under 2KiB) and can be serviced from a | |
749 | * mempool, ensuring that NFS reads and writes can always proceed, | |
750 | * and that there is good locality of reference for these buffers. | |
751 | * | |
1da177e4 | 752 | * In order to avoid memory starvation triggering more writebacks of |
c5a4dd8b | 753 | * NFS requests, we avoid using GFP_KERNEL. |
1da177e4 | 754 | */ |
c5a4dd8b | 755 | void *rpc_malloc(struct rpc_task *task, size_t size) |
1da177e4 | 756 | { |
c5a4dd8b CL |
757 | size_t *buf; |
758 | gfp_t gfp = RPC_IS_SWAPPER(task) ? GFP_ATOMIC : GFP_NOWAIT; | |
1da177e4 | 759 | |
c5a4dd8b CL |
760 | size += sizeof(size_t); |
761 | if (size <= RPC_BUFFER_MAXSIZE) | |
762 | buf = mempool_alloc(rpc_buffer_mempool, gfp); | |
1da177e4 | 763 | else |
c5a4dd8b CL |
764 | buf = kmalloc(size, gfp); |
765 | *buf = size; | |
215d0678 | 766 | dprintk("RPC: %5u allocated buffer of size %zu at %p\n", |
c5a4dd8b | 767 | task->tk_pid, size, buf); |
215d0678 | 768 | return ++buf; |
1da177e4 LT |
769 | } |
770 | ||
02107148 CL |
771 | /** |
772 | * rpc_free - free buffer allocated via rpc_malloc | |
c5a4dd8b | 773 | * @buffer: buffer to free |
02107148 CL |
774 | * |
775 | */ | |
c5a4dd8b | 776 | void rpc_free(void *buffer) |
1da177e4 | 777 | { |
215d0678 | 778 | size_t size, *buf = buffer; |
02107148 | 779 | |
c5a4dd8b CL |
780 | if (!buffer) |
781 | return; | |
782 | size = *buf; | |
783 | buf--; | |
784 | ||
215d0678 | 785 | dprintk("RPC: freeing buffer of size %zu at %p\n", |
c5a4dd8b CL |
786 | size, buf); |
787 | if (size <= RPC_BUFFER_MAXSIZE) | |
788 | mempool_free(buf, rpc_buffer_mempool); | |
789 | else | |
790 | kfree(buf); | |
1da177e4 LT |
791 | } |
792 | ||
793 | /* | |
794 | * Creation and deletion of RPC task structures | |
795 | */ | |
963d8fe5 | 796 | void rpc_init_task(struct rpc_task *task, struct rpc_clnt *clnt, int flags, const struct rpc_call_ops *tk_ops, void *calldata) |
1da177e4 LT |
797 | { |
798 | memset(task, 0, sizeof(*task)); | |
799 | init_timer(&task->tk_timer); | |
800 | task->tk_timer.data = (unsigned long) task; | |
801 | task->tk_timer.function = (void (*)(unsigned long)) rpc_run_timer; | |
44c28873 | 802 | atomic_set(&task->tk_count, 1); |
1da177e4 LT |
803 | task->tk_client = clnt; |
804 | task->tk_flags = flags; | |
963d8fe5 | 805 | task->tk_ops = tk_ops; |
4ce70ada TM |
806 | if (tk_ops->rpc_call_prepare != NULL) |
807 | task->tk_action = rpc_prepare_task; | |
963d8fe5 | 808 | task->tk_calldata = calldata; |
1da177e4 LT |
809 | |
810 | /* Initialize retry counters */ | |
811 | task->tk_garb_retry = 2; | |
812 | task->tk_cred_retry = 2; | |
813 | ||
814 | task->tk_priority = RPC_PRIORITY_NORMAL; | |
815 | task->tk_cookie = (unsigned long)current; | |
816 | ||
817 | /* Initialize workqueue for async tasks */ | |
818 | task->tk_workqueue = rpciod_workqueue; | |
1da177e4 LT |
819 | |
820 | if (clnt) { | |
821 | atomic_inc(&clnt->cl_users); | |
822 | if (clnt->cl_softrtry) | |
823 | task->tk_flags |= RPC_TASK_SOFT; | |
824 | if (!clnt->cl_intr) | |
825 | task->tk_flags |= RPC_TASK_NOINTR; | |
826 | } | |
827 | ||
963d8fe5 TM |
828 | BUG_ON(task->tk_ops == NULL); |
829 | ||
ef759a2e CL |
830 | /* starting timestamp */ |
831 | task->tk_start = jiffies; | |
832 | ||
46121cf7 | 833 | dprintk("RPC: new task initialized, procpid %u\n", |
1da177e4 LT |
834 | current->pid); |
835 | } | |
836 | ||
837 | static struct rpc_task * | |
838 | rpc_alloc_task(void) | |
839 | { | |
840 | return (struct rpc_task *)mempool_alloc(rpc_task_mempool, GFP_NOFS); | |
841 | } | |
842 | ||
8aca67f0 | 843 | static void rpc_free_task(struct rcu_head *rcu) |
1da177e4 | 844 | { |
8aca67f0 | 845 | struct rpc_task *task = container_of(rcu, struct rpc_task, u.tk_rcu); |
46121cf7 | 846 | dprintk("RPC: %5u freeing task\n", task->tk_pid); |
1da177e4 LT |
847 | mempool_free(task, rpc_task_mempool); |
848 | } | |
849 | ||
850 | /* | |
851 | * Create a new task for the specified client. We have to | |
852 | * clean up after an allocation failure, as the client may | |
853 | * have specified "oneshot". | |
854 | */ | |
963d8fe5 | 855 | struct rpc_task *rpc_new_task(struct rpc_clnt *clnt, int flags, const struct rpc_call_ops *tk_ops, void *calldata) |
1da177e4 LT |
856 | { |
857 | struct rpc_task *task; | |
858 | ||
859 | task = rpc_alloc_task(); | |
860 | if (!task) | |
861 | goto cleanup; | |
862 | ||
963d8fe5 | 863 | rpc_init_task(task, clnt, flags, tk_ops, calldata); |
1da177e4 | 864 | |
46121cf7 | 865 | dprintk("RPC: allocated task %p\n", task); |
1da177e4 LT |
866 | task->tk_flags |= RPC_TASK_DYNAMIC; |
867 | out: | |
868 | return task; | |
869 | ||
870 | cleanup: | |
871 | /* Check whether to release the client */ | |
872 | if (clnt) { | |
873 | printk("rpc_new_task: failed, users=%d, oneshot=%d\n", | |
874 | atomic_read(&clnt->cl_users), clnt->cl_oneshot); | |
875 | atomic_inc(&clnt->cl_users); /* pretend we were used ... */ | |
876 | rpc_release_client(clnt); | |
877 | } | |
878 | goto out; | |
879 | } | |
880 | ||
e6b3c4db TM |
881 | |
882 | void rpc_put_task(struct rpc_task *task) | |
1da177e4 | 883 | { |
963d8fe5 TM |
884 | const struct rpc_call_ops *tk_ops = task->tk_ops; |
885 | void *calldata = task->tk_calldata; | |
1da177e4 | 886 | |
e6b3c4db TM |
887 | if (!atomic_dec_and_test(&task->tk_count)) |
888 | return; | |
889 | /* Release resources */ | |
890 | if (task->tk_rqstp) | |
891 | xprt_release(task); | |
892 | if (task->tk_msg.rpc_cred) | |
893 | rpcauth_unbindcred(task); | |
894 | if (task->tk_client) { | |
895 | rpc_release_client(task->tk_client); | |
896 | task->tk_client = NULL; | |
897 | } | |
898 | if (task->tk_flags & RPC_TASK_DYNAMIC) | |
8aca67f0 | 899 | call_rcu_bh(&task->u.tk_rcu, rpc_free_task); |
bbd5a1f9 | 900 | rpc_release_calldata(tk_ops, calldata); |
e6b3c4db TM |
901 | } |
902 | EXPORT_SYMBOL(rpc_put_task); | |
903 | ||
bde8f00c | 904 | static void rpc_release_task(struct rpc_task *task) |
e6b3c4db | 905 | { |
1da177e4 LT |
906 | #ifdef RPC_DEBUG |
907 | BUG_ON(task->tk_magic != RPC_TASK_MAGIC_ID); | |
908 | #endif | |
46121cf7 | 909 | dprintk("RPC: %5u release task\n", task->tk_pid); |
1da177e4 LT |
910 | |
911 | /* Remove from global task list */ | |
912 | spin_lock(&rpc_sched_lock); | |
913 | list_del(&task->tk_task); | |
914 | spin_unlock(&rpc_sched_lock); | |
915 | ||
916 | BUG_ON (RPC_IS_QUEUED(task)); | |
1da177e4 LT |
917 | |
918 | /* Synchronously delete any running timer */ | |
919 | rpc_delete_timer(task); | |
920 | ||
1da177e4 LT |
921 | #ifdef RPC_DEBUG |
922 | task->tk_magic = 0; | |
923 | #endif | |
e6b3c4db TM |
924 | /* Wake up anyone who is waiting for task completion */ |
925 | rpc_mark_complete_task(task); | |
926 | ||
927 | rpc_put_task(task); | |
1da177e4 LT |
928 | } |
929 | ||
44c28873 TM |
930 | /** |
931 | * rpc_run_task - Allocate a new RPC task, then run rpc_execute against it | |
99acf044 MW |
932 | * @clnt: pointer to RPC client |
933 | * @flags: RPC flags | |
934 | * @ops: RPC call ops | |
935 | * @data: user call data | |
44c28873 TM |
936 | */ |
937 | struct rpc_task *rpc_run_task(struct rpc_clnt *clnt, int flags, | |
938 | const struct rpc_call_ops *ops, | |
939 | void *data) | |
940 | { | |
941 | struct rpc_task *task; | |
942 | task = rpc_new_task(clnt, flags, ops, data); | |
7a1218a2 | 943 | if (task == NULL) { |
bbd5a1f9 | 944 | rpc_release_calldata(ops, data); |
44c28873 | 945 | return ERR_PTR(-ENOMEM); |
7a1218a2 | 946 | } |
44c28873 TM |
947 | atomic_inc(&task->tk_count); |
948 | rpc_execute(task); | |
949 | return task; | |
950 | } | |
951 | EXPORT_SYMBOL(rpc_run_task); | |
952 | ||
1da177e4 LT |
953 | /* |
954 | * Kill all tasks for the given client. | |
955 | * XXX: kill their descendants as well? | |
956 | */ | |
957 | void rpc_killall_tasks(struct rpc_clnt *clnt) | |
958 | { | |
959 | struct rpc_task *rovr; | |
960 | struct list_head *le; | |
961 | ||
46121cf7 | 962 | dprintk("RPC: killing all tasks for client %p\n", clnt); |
1da177e4 LT |
963 | |
964 | /* | |
965 | * Spin lock all_tasks to prevent changes... | |
966 | */ | |
967 | spin_lock(&rpc_sched_lock); | |
968 | alltask_for_each(rovr, le, &all_tasks) { | |
969 | if (! RPC_IS_ACTIVATED(rovr)) | |
970 | continue; | |
971 | if (!clnt || rovr->tk_client == clnt) { | |
972 | rovr->tk_flags |= RPC_TASK_KILLED; | |
973 | rpc_exit(rovr, -EIO); | |
974 | rpc_wake_up_task(rovr); | |
975 | } | |
976 | } | |
977 | spin_unlock(&rpc_sched_lock); | |
978 | } | |
979 | ||
980 | static DECLARE_MUTEX_LOCKED(rpciod_running); | |
981 | ||
982 | static void rpciod_killall(void) | |
983 | { | |
984 | unsigned long flags; | |
985 | ||
986 | while (!list_empty(&all_tasks)) { | |
987 | clear_thread_flag(TIF_SIGPENDING); | |
988 | rpc_killall_tasks(NULL); | |
989 | flush_workqueue(rpciod_workqueue); | |
990 | if (!list_empty(&all_tasks)) { | |
46121cf7 CL |
991 | dprintk("RPC: rpciod_killall: waiting for tasks " |
992 | "to exit\n"); | |
1da177e4 LT |
993 | yield(); |
994 | } | |
995 | } | |
996 | ||
997 | spin_lock_irqsave(¤t->sighand->siglock, flags); | |
998 | recalc_sigpending(); | |
999 | spin_unlock_irqrestore(¤t->sighand->siglock, flags); | |
1000 | } | |
1001 | ||
1002 | /* | |
1003 | * Start up the rpciod process if it's not already running. | |
1004 | */ | |
1005 | int | |
1006 | rpciod_up(void) | |
1007 | { | |
1008 | struct workqueue_struct *wq; | |
1009 | int error = 0; | |
1010 | ||
4a3e2f71 | 1011 | mutex_lock(&rpciod_mutex); |
46121cf7 | 1012 | dprintk("RPC: rpciod_up: users %u\n", rpciod_users); |
1da177e4 LT |
1013 | rpciod_users++; |
1014 | if (rpciod_workqueue) | |
1015 | goto out; | |
1016 | /* | |
1017 | * If there's no pid, we should be the first user. | |
1018 | */ | |
1019 | if (rpciod_users > 1) | |
46121cf7 | 1020 | printk(KERN_WARNING "rpciod_up: no workqueue, %u users??\n", rpciod_users); |
1da177e4 LT |
1021 | /* |
1022 | * Create the rpciod thread and wait for it to start. | |
1023 | */ | |
1024 | error = -ENOMEM; | |
1025 | wq = create_workqueue("rpciod"); | |
1026 | if (wq == NULL) { | |
1027 | printk(KERN_WARNING "rpciod_up: create workqueue failed, error=%d\n", error); | |
1028 | rpciod_users--; | |
1029 | goto out; | |
1030 | } | |
1031 | rpciod_workqueue = wq; | |
1032 | error = 0; | |
1033 | out: | |
4a3e2f71 | 1034 | mutex_unlock(&rpciod_mutex); |
1da177e4 LT |
1035 | return error; |
1036 | } | |
1037 | ||
1038 | void | |
1039 | rpciod_down(void) | |
1040 | { | |
4a3e2f71 | 1041 | mutex_lock(&rpciod_mutex); |
46121cf7 | 1042 | dprintk("RPC: rpciod_down sema %u\n", rpciod_users); |
1da177e4 LT |
1043 | if (rpciod_users) { |
1044 | if (--rpciod_users) | |
1045 | goto out; | |
1046 | } else | |
1047 | printk(KERN_WARNING "rpciod_down: no users??\n"); | |
1048 | ||
1049 | if (!rpciod_workqueue) { | |
46121cf7 | 1050 | dprintk("RPC: rpciod_down: Nothing to do!\n"); |
1da177e4 LT |
1051 | goto out; |
1052 | } | |
1053 | rpciod_killall(); | |
1054 | ||
1055 | destroy_workqueue(rpciod_workqueue); | |
1056 | rpciod_workqueue = NULL; | |
1057 | out: | |
4a3e2f71 | 1058 | mutex_unlock(&rpciod_mutex); |
1da177e4 LT |
1059 | } |
1060 | ||
1061 | #ifdef RPC_DEBUG | |
1062 | void rpc_show_tasks(void) | |
1063 | { | |
1064 | struct list_head *le; | |
1065 | struct rpc_task *t; | |
1066 | ||
1067 | spin_lock(&rpc_sched_lock); | |
1068 | if (list_empty(&all_tasks)) { | |
1069 | spin_unlock(&rpc_sched_lock); | |
1070 | return; | |
1071 | } | |
1072 | printk("-pid- proc flgs status -client- -prog- --rqstp- -timeout " | |
963d8fe5 | 1073 | "-rpcwait -action- ---ops--\n"); |
1da177e4 LT |
1074 | alltask_for_each(t, le, &all_tasks) { |
1075 | const char *rpc_waitq = "none"; | |
1076 | ||
1077 | if (RPC_IS_QUEUED(t)) | |
1078 | rpc_waitq = rpc_qname(t->u.tk_wait.rpc_waitq); | |
1079 | ||
46121cf7 | 1080 | printk("%5u %04d %04x %6d %8p %6d %8p %8ld %8s %8p %8p\n", |
1da177e4 LT |
1081 | t->tk_pid, |
1082 | (t->tk_msg.rpc_proc ? t->tk_msg.rpc_proc->p_proc : -1), | |
1083 | t->tk_flags, t->tk_status, | |
1084 | t->tk_client, | |
1085 | (t->tk_client ? t->tk_client->cl_prog : 0), | |
1086 | t->tk_rqstp, t->tk_timeout, | |
1087 | rpc_waitq, | |
963d8fe5 | 1088 | t->tk_action, t->tk_ops); |
1da177e4 LT |
1089 | } |
1090 | spin_unlock(&rpc_sched_lock); | |
1091 | } | |
1092 | #endif | |
1093 | ||
1094 | void | |
1095 | rpc_destroy_mempool(void) | |
1096 | { | |
1097 | if (rpc_buffer_mempool) | |
1098 | mempool_destroy(rpc_buffer_mempool); | |
1099 | if (rpc_task_mempool) | |
1100 | mempool_destroy(rpc_task_mempool); | |
1a1d92c1 AD |
1101 | if (rpc_task_slabp) |
1102 | kmem_cache_destroy(rpc_task_slabp); | |
1103 | if (rpc_buffer_slabp) | |
1104 | kmem_cache_destroy(rpc_buffer_slabp); | |
1da177e4 LT |
1105 | } |
1106 | ||
1107 | int | |
1108 | rpc_init_mempool(void) | |
1109 | { | |
1110 | rpc_task_slabp = kmem_cache_create("rpc_tasks", | |
1111 | sizeof(struct rpc_task), | |
1112 | 0, SLAB_HWCACHE_ALIGN, | |
1113 | NULL, NULL); | |
1114 | if (!rpc_task_slabp) | |
1115 | goto err_nomem; | |
1116 | rpc_buffer_slabp = kmem_cache_create("rpc_buffers", | |
1117 | RPC_BUFFER_MAXSIZE, | |
1118 | 0, SLAB_HWCACHE_ALIGN, | |
1119 | NULL, NULL); | |
1120 | if (!rpc_buffer_slabp) | |
1121 | goto err_nomem; | |
93d2341c MD |
1122 | rpc_task_mempool = mempool_create_slab_pool(RPC_TASK_POOLSIZE, |
1123 | rpc_task_slabp); | |
1da177e4 LT |
1124 | if (!rpc_task_mempool) |
1125 | goto err_nomem; | |
93d2341c MD |
1126 | rpc_buffer_mempool = mempool_create_slab_pool(RPC_BUFFER_POOLSIZE, |
1127 | rpc_buffer_slabp); | |
1da177e4 LT |
1128 | if (!rpc_buffer_mempool) |
1129 | goto err_nomem; | |
1130 | return 0; | |
1131 | err_nomem: | |
1132 | rpc_destroy_mempool(); | |
1133 | return -ENOMEM; | |
1134 | } |