Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 7 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 21 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | |
| 23 | #include <linux/sunrpc/clnt.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | |
| 25 | #ifdef RPC_DEBUG |
| 26 | #define RPCDBG_FACILITY RPCDBG_SCHED |
| 27 | #define RPC_TASK_MAGIC_ID 0xf00baa |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #endif |
| 29 | |
| 30 | /* |
| 31 | * RPC slabs and memory pools |
| 32 | */ |
| 33 | #define RPC_BUFFER_MAXSIZE (2048) |
| 34 | #define RPC_BUFFER_POOLSIZE (8) |
| 35 | #define RPC_TASK_POOLSIZE (8) |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 36 | static struct kmem_cache *rpc_task_slabp __read_mostly; |
| 37 | static struct kmem_cache *rpc_buffer_slabp __read_mostly; |
Eric Dumazet | ba89966 | 2005-08-26 12:05:31 -0700 | [diff] [blame] | 38 | static mempool_t *rpc_task_mempool __read_mostly; |
| 39 | static mempool_t *rpc_buffer_mempool __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | |
David Howells | 65f27f3 | 2006-11-22 14:55:48 +0000 | [diff] [blame] | 41 | static void rpc_async_schedule(struct work_struct *); |
Trond Myklebust | bde8f00 | 2007-01-24 11:54:53 -0800 | [diff] [blame] | 42 | static void rpc_release_task(struct rpc_task *task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | |
| 44 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | * RPC tasks sit here while waiting for conditions to improve. |
| 46 | */ |
Trond Myklebust | a4a8749 | 2007-07-18 13:24:19 -0400 | [diff] [blame] | 47 | static struct rpc_wait_queue delay_queue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | |
| 49 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | * rpciod-related stuff |
| 51 | */ |
Trond Myklebust | 24c5d9d | 2006-03-20 13:44:08 -0500 | [diff] [blame] | 52 | struct workqueue_struct *rpciod_workqueue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | |
| 54 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | * Disable the timer for a given RPC task. Should be called with |
| 56 | * queue->lock and bh_disabled in order to avoid races within |
| 57 | * rpc_run_timer(). |
| 58 | */ |
Trond Myklebust | 5d00837 | 2008-02-22 16:34:17 -0500 | [diff] [blame] | 59 | static void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | __rpc_disable_timer(struct rpc_task *task) |
| 61 | { |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 62 | dprintk("RPC: %5u disabling timer\n", task->tk_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | task->tk_timeout = 0; |
| 64 | } |
| 65 | |
| 66 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | * Set up a timer for the current task. |
| 68 | */ |
Trond Myklebust | 5d00837 | 2008-02-22 16:34:17 -0500 | [diff] [blame] | 69 | static void |
| 70 | __rpc_add_timer(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | { |
| 72 | if (!task->tk_timeout) |
| 73 | return; |
| 74 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 75 | dprintk("RPC: %5u setting alarm for %lu ms\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | task->tk_pid, task->tk_timeout * 1000 / HZ); |
| 77 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | set_bit(RPC_TASK_HAS_TIMER, &task->tk_runstate); |
| 79 | mod_timer(&task->tk_timer, jiffies + task->tk_timeout); |
| 80 | } |
| 81 | |
| 82 | /* |
| 83 | * Delete any timer for the current task. Because we use del_timer_sync(), |
| 84 | * this function should never be called while holding queue->lock. |
| 85 | */ |
| 86 | static void |
| 87 | rpc_delete_timer(struct rpc_task *task) |
| 88 | { |
| 89 | if (RPC_IS_QUEUED(task)) |
| 90 | return; |
| 91 | if (test_and_clear_bit(RPC_TASK_HAS_TIMER, &task->tk_runstate)) { |
| 92 | del_singleshot_timer_sync(&task->tk_timer); |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 93 | dprintk("RPC: %5u deleting timer\n", task->tk_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | } |
| 95 | } |
| 96 | |
| 97 | /* |
| 98 | * Add new request to a priority queue. |
| 99 | */ |
| 100 | static void __rpc_add_wait_queue_priority(struct rpc_wait_queue *queue, struct rpc_task *task) |
| 101 | { |
| 102 | struct list_head *q; |
| 103 | struct rpc_task *t; |
| 104 | |
| 105 | INIT_LIST_HEAD(&task->u.tk_wait.links); |
| 106 | q = &queue->tasks[task->tk_priority]; |
| 107 | if (unlikely(task->tk_priority > queue->maxpriority)) |
| 108 | q = &queue->tasks[queue->maxpriority]; |
| 109 | list_for_each_entry(t, q, u.tk_wait.list) { |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 110 | if (t->tk_owner == task->tk_owner) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | list_add_tail(&task->u.tk_wait.list, &t->u.tk_wait.links); |
| 112 | return; |
| 113 | } |
| 114 | } |
| 115 | list_add_tail(&task->u.tk_wait.list, q); |
| 116 | } |
| 117 | |
| 118 | /* |
| 119 | * Add new request to wait queue. |
| 120 | * |
| 121 | * Swapper tasks always get inserted at the head of the queue. |
| 122 | * This should avoid many nasty memory deadlocks and hopefully |
| 123 | * improve overall performance. |
| 124 | * Everyone else gets appended to the queue to ensure proper FIFO behavior. |
| 125 | */ |
| 126 | static void __rpc_add_wait_queue(struct rpc_wait_queue *queue, struct rpc_task *task) |
| 127 | { |
| 128 | BUG_ON (RPC_IS_QUEUED(task)); |
| 129 | |
| 130 | if (RPC_IS_PRIORITY(queue)) |
| 131 | __rpc_add_wait_queue_priority(queue, task); |
| 132 | else if (RPC_IS_SWAPPER(task)) |
| 133 | list_add(&task->u.tk_wait.list, &queue->tasks[0]); |
| 134 | else |
| 135 | list_add_tail(&task->u.tk_wait.list, &queue->tasks[0]); |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 136 | task->tk_waitqueue = queue; |
Chuck Lever | e19b63d | 2006-03-20 13:44:15 -0500 | [diff] [blame] | 137 | queue->qlen++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | rpc_set_queued(task); |
| 139 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 140 | dprintk("RPC: %5u added to queue %p \"%s\"\n", |
| 141 | task->tk_pid, queue, rpc_qname(queue)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | } |
| 143 | |
| 144 | /* |
| 145 | * Remove request from a priority queue. |
| 146 | */ |
| 147 | static void __rpc_remove_wait_queue_priority(struct rpc_task *task) |
| 148 | { |
| 149 | struct rpc_task *t; |
| 150 | |
| 151 | if (!list_empty(&task->u.tk_wait.links)) { |
| 152 | t = list_entry(task->u.tk_wait.links.next, struct rpc_task, u.tk_wait.list); |
| 153 | list_move(&t->u.tk_wait.list, &task->u.tk_wait.list); |
| 154 | list_splice_init(&task->u.tk_wait.links, &t->u.tk_wait.links); |
| 155 | } |
| 156 | list_del(&task->u.tk_wait.list); |
| 157 | } |
| 158 | |
| 159 | /* |
| 160 | * Remove request from queue. |
| 161 | * Note: must be called with spin lock held. |
| 162 | */ |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 163 | static void __rpc_remove_wait_queue(struct rpc_wait_queue *queue, struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | if (RPC_IS_PRIORITY(queue)) |
| 166 | __rpc_remove_wait_queue_priority(task); |
| 167 | else |
| 168 | list_del(&task->u.tk_wait.list); |
Chuck Lever | e19b63d | 2006-03-20 13:44:15 -0500 | [diff] [blame] | 169 | queue->qlen--; |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 170 | dprintk("RPC: %5u removed from queue %p \"%s\"\n", |
| 171 | task->tk_pid, queue, rpc_qname(queue)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | } |
| 173 | |
| 174 | static inline void rpc_set_waitqueue_priority(struct rpc_wait_queue *queue, int priority) |
| 175 | { |
| 176 | queue->priority = priority; |
| 177 | queue->count = 1 << (priority * 2); |
| 178 | } |
| 179 | |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 180 | static inline void rpc_set_waitqueue_owner(struct rpc_wait_queue *queue, pid_t pid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | { |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 182 | queue->owner = pid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | queue->nr = RPC_BATCH_COUNT; |
| 184 | } |
| 185 | |
| 186 | static inline void rpc_reset_waitqueue_priority(struct rpc_wait_queue *queue) |
| 187 | { |
| 188 | rpc_set_waitqueue_priority(queue, queue->maxpriority); |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 189 | rpc_set_waitqueue_owner(queue, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | } |
| 191 | |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 192 | static void __rpc_init_priority_wait_queue(struct rpc_wait_queue *queue, const char *qname, unsigned char nr_queues) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | { |
| 194 | int i; |
| 195 | |
| 196 | spin_lock_init(&queue->lock); |
| 197 | for (i = 0; i < ARRAY_SIZE(queue->tasks); i++) |
| 198 | INIT_LIST_HEAD(&queue->tasks[i]); |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 199 | queue->maxpriority = nr_queues - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | rpc_reset_waitqueue_priority(queue); |
| 201 | #ifdef RPC_DEBUG |
| 202 | queue->name = qname; |
| 203 | #endif |
| 204 | } |
| 205 | |
| 206 | void rpc_init_priority_wait_queue(struct rpc_wait_queue *queue, const char *qname) |
| 207 | { |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 208 | __rpc_init_priority_wait_queue(queue, qname, RPC_NR_PRIORITY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | } |
| 210 | |
| 211 | void rpc_init_wait_queue(struct rpc_wait_queue *queue, const char *qname) |
| 212 | { |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 213 | __rpc_init_priority_wait_queue(queue, qname, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 215 | EXPORT_SYMBOL_GPL(rpc_init_wait_queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | |
Trond Myklebust | f6a1cc8 | 2008-02-22 17:06:55 -0500 | [diff] [blame^] | 217 | void rpc_destroy_wait_queue(struct rpc_wait_queue *queue) |
| 218 | { |
| 219 | } |
| 220 | EXPORT_SYMBOL_GPL(rpc_destroy_wait_queue); |
| 221 | |
Matthew Wilcox | 150030b | 2007-12-06 16:24:39 -0500 | [diff] [blame] | 222 | static int rpc_wait_bit_killable(void *word) |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 223 | { |
Matthew Wilcox | 150030b | 2007-12-06 16:24:39 -0500 | [diff] [blame] | 224 | if (fatal_signal_pending(current)) |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 225 | return -ERESTARTSYS; |
| 226 | schedule(); |
| 227 | return 0; |
| 228 | } |
| 229 | |
Trond Myklebust | c44fe70 | 2007-06-16 14:17:01 -0400 | [diff] [blame] | 230 | #ifdef RPC_DEBUG |
| 231 | static void rpc_task_set_debuginfo(struct rpc_task *task) |
| 232 | { |
| 233 | static atomic_t rpc_pid; |
| 234 | |
| 235 | task->tk_magic = RPC_TASK_MAGIC_ID; |
| 236 | task->tk_pid = atomic_inc_return(&rpc_pid); |
| 237 | } |
| 238 | #else |
| 239 | static inline void rpc_task_set_debuginfo(struct rpc_task *task) |
| 240 | { |
| 241 | } |
| 242 | #endif |
| 243 | |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 244 | static void rpc_set_active(struct rpc_task *task) |
| 245 | { |
Trond Myklebust | 4bef61f | 2007-06-16 14:17:01 -0400 | [diff] [blame] | 246 | struct rpc_clnt *clnt; |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 247 | if (test_and_set_bit(RPC_TASK_ACTIVE, &task->tk_runstate) != 0) |
| 248 | return; |
Trond Myklebust | c44fe70 | 2007-06-16 14:17:01 -0400 | [diff] [blame] | 249 | rpc_task_set_debuginfo(task); |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 250 | /* Add to global list of all tasks */ |
Trond Myklebust | 4bef61f | 2007-06-16 14:17:01 -0400 | [diff] [blame] | 251 | clnt = task->tk_client; |
| 252 | if (clnt != NULL) { |
| 253 | spin_lock(&clnt->cl_lock); |
| 254 | list_add_tail(&task->tk_task, &clnt->cl_tasks); |
| 255 | spin_unlock(&clnt->cl_lock); |
| 256 | } |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 257 | } |
| 258 | |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 259 | /* |
| 260 | * Mark an RPC call as having completed by clearing the 'active' bit |
| 261 | */ |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 262 | static void rpc_mark_complete_task(struct rpc_task *task) |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 263 | { |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 264 | smp_mb__before_clear_bit(); |
| 265 | clear_bit(RPC_TASK_ACTIVE, &task->tk_runstate); |
| 266 | smp_mb__after_clear_bit(); |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 267 | wake_up_bit(&task->tk_runstate, RPC_TASK_ACTIVE); |
| 268 | } |
| 269 | |
| 270 | /* |
| 271 | * Allow callers to wait for completion of an RPC call |
| 272 | */ |
| 273 | int __rpc_wait_for_completion_task(struct rpc_task *task, int (*action)(void *)) |
| 274 | { |
| 275 | if (action == NULL) |
Matthew Wilcox | 150030b | 2007-12-06 16:24:39 -0500 | [diff] [blame] | 276 | action = rpc_wait_bit_killable; |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 277 | return wait_on_bit(&task->tk_runstate, RPC_TASK_ACTIVE, |
Matthew Wilcox | 150030b | 2007-12-06 16:24:39 -0500 | [diff] [blame] | 278 | action, TASK_KILLABLE); |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 279 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 280 | EXPORT_SYMBOL_GPL(__rpc_wait_for_completion_task); |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 281 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | /* |
| 283 | * Make an RPC task runnable. |
| 284 | * |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 285 | * Note: If the task is ASYNC, this must be called with |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | * the spinlock held to protect the wait queue operation. |
| 287 | */ |
| 288 | static void rpc_make_runnable(struct rpc_task *task) |
| 289 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | rpc_clear_queued(task); |
Christophe Saout | cc4dc59e | 2006-11-05 18:42:48 +0100 | [diff] [blame] | 291 | if (rpc_test_and_set_running(task)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | return; |
Christophe Saout | cc4dc59e | 2006-11-05 18:42:48 +0100 | [diff] [blame] | 293 | /* We might have raced */ |
| 294 | if (RPC_IS_QUEUED(task)) { |
| 295 | rpc_clear_running(task); |
| 296 | return; |
| 297 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | if (RPC_IS_ASYNC(task)) { |
| 299 | int status; |
| 300 | |
David Howells | 65f27f3 | 2006-11-22 14:55:48 +0000 | [diff] [blame] | 301 | INIT_WORK(&task->u.tk_work, rpc_async_schedule); |
Trond Myklebust | 32bfb5c | 2008-02-19 20:04:21 -0500 | [diff] [blame] | 302 | status = queue_work(rpciod_workqueue, &task->u.tk_work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | if (status < 0) { |
| 304 | printk(KERN_WARNING "RPC: failed to add task to queue: error: %d!\n", status); |
| 305 | task->tk_status = status; |
| 306 | return; |
| 307 | } |
| 308 | } else |
Trond Myklebust | 96651ab | 2005-06-22 17:16:21 +0000 | [diff] [blame] | 309 | wake_up_bit(&task->tk_runstate, RPC_TASK_QUEUED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | } |
| 311 | |
| 312 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | * Prepare for sleeping on a wait queue. |
| 314 | * By always appending tasks to the list we ensure FIFO behavior. |
| 315 | * NB: An RPC task will only receive interrupt-driven events as long |
| 316 | * as it's on a wait queue. |
| 317 | */ |
| 318 | static void __rpc_sleep_on(struct rpc_wait_queue *q, struct rpc_task *task, |
Trond Myklebust | 5d00837 | 2008-02-22 16:34:17 -0500 | [diff] [blame] | 319 | rpc_action action) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | { |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 321 | dprintk("RPC: %5u sleep_on(queue \"%s\" time %lu)\n", |
| 322 | task->tk_pid, rpc_qname(q), jiffies); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | |
| 324 | if (!RPC_IS_ASYNC(task) && !RPC_IS_ACTIVATED(task)) { |
| 325 | printk(KERN_ERR "RPC: Inactive synchronous task put to sleep!\n"); |
| 326 | return; |
| 327 | } |
| 328 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | __rpc_add_wait_queue(q, task); |
| 330 | |
| 331 | BUG_ON(task->tk_callback != NULL); |
| 332 | task->tk_callback = action; |
Trond Myklebust | 5d00837 | 2008-02-22 16:34:17 -0500 | [diff] [blame] | 333 | __rpc_add_timer(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | } |
| 335 | |
| 336 | void rpc_sleep_on(struct rpc_wait_queue *q, struct rpc_task *task, |
Trond Myklebust | 5d00837 | 2008-02-22 16:34:17 -0500 | [diff] [blame] | 337 | rpc_action action) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | { |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 339 | /* Mark the task as being activated if so needed */ |
| 340 | rpc_set_active(task); |
| 341 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | /* |
| 343 | * Protect the queue operations. |
| 344 | */ |
| 345 | spin_lock_bh(&q->lock); |
Trond Myklebust | 5d00837 | 2008-02-22 16:34:17 -0500 | [diff] [blame] | 346 | __rpc_sleep_on(q, task, action); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | spin_unlock_bh(&q->lock); |
| 348 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 349 | EXPORT_SYMBOL_GPL(rpc_sleep_on); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | |
| 351 | /** |
| 352 | * __rpc_do_wake_up_task - wake up a single rpc_task |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 353 | * @queue: wait queue |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | * @task: task to be woken up |
| 355 | * |
| 356 | * Caller must hold queue->lock, and have cleared the task queued flag. |
| 357 | */ |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 358 | static void __rpc_do_wake_up_task(struct rpc_wait_queue *queue, struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | { |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 360 | dprintk("RPC: %5u __rpc_wake_up_task (now %lu)\n", |
| 361 | task->tk_pid, jiffies); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | |
| 363 | #ifdef RPC_DEBUG |
| 364 | BUG_ON(task->tk_magic != RPC_TASK_MAGIC_ID); |
| 365 | #endif |
| 366 | /* Has the task been executed yet? If not, we cannot wake it up! */ |
| 367 | if (!RPC_IS_ACTIVATED(task)) { |
| 368 | printk(KERN_ERR "RPC: Inactive task (%p) being woken up!\n", task); |
| 369 | return; |
| 370 | } |
| 371 | |
| 372 | __rpc_disable_timer(task); |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 373 | __rpc_remove_wait_queue(queue, task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | |
| 375 | rpc_make_runnable(task); |
| 376 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 377 | dprintk("RPC: __rpc_wake_up_task done\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | } |
| 379 | |
| 380 | /* |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 381 | * Wake up a queued task while the queue lock is being held |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | */ |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 383 | static void rpc_wake_up_task_queue_locked(struct rpc_wait_queue *queue, struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | { |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 385 | if (!RPC_IS_QUEUED(task) || task->tk_waitqueue != queue) |
| 386 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | if (rpc_start_wakeup(task)) { |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 388 | __rpc_do_wake_up_task(queue, task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | rpc_finish_wakeup(task); |
| 390 | } |
| 391 | } |
| 392 | |
| 393 | /* |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 394 | * Wake up a task on a specific queue |
| 395 | */ |
| 396 | void rpc_wake_up_queued_task(struct rpc_wait_queue *queue, struct rpc_task *task) |
| 397 | { |
| 398 | rcu_read_lock_bh(); |
| 399 | spin_lock(&queue->lock); |
| 400 | rpc_wake_up_task_queue_locked(queue, task); |
| 401 | spin_unlock(&queue->lock); |
| 402 | rcu_read_unlock_bh(); |
| 403 | } |
| 404 | EXPORT_SYMBOL_GPL(rpc_wake_up_queued_task); |
| 405 | |
| 406 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | * Wake up the specified task |
| 408 | */ |
Trond Myklebust | fda1393 | 2008-02-22 16:34:12 -0500 | [diff] [blame] | 409 | static void rpc_wake_up_task(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | { |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 411 | rpc_wake_up_queued_task(task->tk_waitqueue, task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | } |
| 413 | |
| 414 | /* |
| 415 | * Wake up the next task on a priority queue. |
| 416 | */ |
| 417 | static struct rpc_task * __rpc_wake_up_next_priority(struct rpc_wait_queue *queue) |
| 418 | { |
| 419 | struct list_head *q; |
| 420 | struct rpc_task *task; |
| 421 | |
| 422 | /* |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 423 | * Service a batch of tasks from a single owner. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | */ |
| 425 | q = &queue->tasks[queue->priority]; |
| 426 | if (!list_empty(q)) { |
| 427 | task = list_entry(q->next, struct rpc_task, u.tk_wait.list); |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 428 | if (queue->owner == task->tk_owner) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | if (--queue->nr) |
| 430 | goto out; |
| 431 | list_move_tail(&task->u.tk_wait.list, q); |
| 432 | } |
| 433 | /* |
| 434 | * Check if we need to switch queues. |
| 435 | */ |
| 436 | if (--queue->count) |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 437 | goto new_owner; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | } |
| 439 | |
| 440 | /* |
| 441 | * Service the next queue. |
| 442 | */ |
| 443 | do { |
| 444 | if (q == &queue->tasks[0]) |
| 445 | q = &queue->tasks[queue->maxpriority]; |
| 446 | else |
| 447 | q = q - 1; |
| 448 | if (!list_empty(q)) { |
| 449 | task = list_entry(q->next, struct rpc_task, u.tk_wait.list); |
| 450 | goto new_queue; |
| 451 | } |
| 452 | } while (q != &queue->tasks[queue->priority]); |
| 453 | |
| 454 | rpc_reset_waitqueue_priority(queue); |
| 455 | return NULL; |
| 456 | |
| 457 | new_queue: |
| 458 | rpc_set_waitqueue_priority(queue, (unsigned int)(q - &queue->tasks[0])); |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 459 | new_owner: |
| 460 | rpc_set_waitqueue_owner(queue, task->tk_owner); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | out: |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 462 | rpc_wake_up_task_queue_locked(queue, task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | return task; |
| 464 | } |
| 465 | |
| 466 | /* |
| 467 | * Wake up the next task on the wait queue. |
| 468 | */ |
| 469 | struct rpc_task * rpc_wake_up_next(struct rpc_wait_queue *queue) |
| 470 | { |
| 471 | struct rpc_task *task = NULL; |
| 472 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 473 | dprintk("RPC: wake_up_next(%p \"%s\")\n", |
| 474 | queue, rpc_qname(queue)); |
Trond Myklebust | 8aca67f | 2006-11-13 16:23:44 -0500 | [diff] [blame] | 475 | rcu_read_lock_bh(); |
| 476 | spin_lock(&queue->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | if (RPC_IS_PRIORITY(queue)) |
| 478 | task = __rpc_wake_up_next_priority(queue); |
| 479 | else { |
| 480 | task_for_first(task, &queue->tasks[0]) |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 481 | rpc_wake_up_task_queue_locked(queue, task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | } |
Trond Myklebust | 8aca67f | 2006-11-13 16:23:44 -0500 | [diff] [blame] | 483 | spin_unlock(&queue->lock); |
| 484 | rcu_read_unlock_bh(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | |
| 486 | return task; |
| 487 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 488 | EXPORT_SYMBOL_GPL(rpc_wake_up_next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | |
| 490 | /** |
| 491 | * rpc_wake_up - wake up all rpc_tasks |
| 492 | * @queue: rpc_wait_queue on which the tasks are sleeping |
| 493 | * |
| 494 | * Grabs queue->lock |
| 495 | */ |
| 496 | void rpc_wake_up(struct rpc_wait_queue *queue) |
| 497 | { |
Trond Myklebust | e6d83d5 | 2006-03-13 21:20:48 -0800 | [diff] [blame] | 498 | struct rpc_task *task, *next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | struct list_head *head; |
Trond Myklebust | e6d83d5 | 2006-03-13 21:20:48 -0800 | [diff] [blame] | 500 | |
Trond Myklebust | 8aca67f | 2006-11-13 16:23:44 -0500 | [diff] [blame] | 501 | rcu_read_lock_bh(); |
| 502 | spin_lock(&queue->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | head = &queue->tasks[queue->maxpriority]; |
| 504 | for (;;) { |
Trond Myklebust | e6d83d5 | 2006-03-13 21:20:48 -0800 | [diff] [blame] | 505 | list_for_each_entry_safe(task, next, head, u.tk_wait.list) |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 506 | rpc_wake_up_task_queue_locked(queue, task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | if (head == &queue->tasks[0]) |
| 508 | break; |
| 509 | head--; |
| 510 | } |
Trond Myklebust | 8aca67f | 2006-11-13 16:23:44 -0500 | [diff] [blame] | 511 | spin_unlock(&queue->lock); |
| 512 | rcu_read_unlock_bh(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 514 | EXPORT_SYMBOL_GPL(rpc_wake_up); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | |
| 516 | /** |
| 517 | * rpc_wake_up_status - wake up all rpc_tasks and set their status value. |
| 518 | * @queue: rpc_wait_queue on which the tasks are sleeping |
| 519 | * @status: status value to set |
| 520 | * |
| 521 | * Grabs queue->lock |
| 522 | */ |
| 523 | void rpc_wake_up_status(struct rpc_wait_queue *queue, int status) |
| 524 | { |
Trond Myklebust | e6d83d5 | 2006-03-13 21:20:48 -0800 | [diff] [blame] | 525 | struct rpc_task *task, *next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | struct list_head *head; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | |
Trond Myklebust | 8aca67f | 2006-11-13 16:23:44 -0500 | [diff] [blame] | 528 | rcu_read_lock_bh(); |
| 529 | spin_lock(&queue->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | head = &queue->tasks[queue->maxpriority]; |
| 531 | for (;;) { |
Trond Myklebust | e6d83d5 | 2006-03-13 21:20:48 -0800 | [diff] [blame] | 532 | list_for_each_entry_safe(task, next, head, u.tk_wait.list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | task->tk_status = status; |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 534 | rpc_wake_up_task_queue_locked(queue, task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | } |
| 536 | if (head == &queue->tasks[0]) |
| 537 | break; |
| 538 | head--; |
| 539 | } |
Trond Myklebust | 8aca67f | 2006-11-13 16:23:44 -0500 | [diff] [blame] | 540 | spin_unlock(&queue->lock); |
| 541 | rcu_read_unlock_bh(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 543 | EXPORT_SYMBOL_GPL(rpc_wake_up_status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | |
Trond Myklebust | fde95c7 | 2008-02-22 15:09:26 -0500 | [diff] [blame] | 545 | /* |
| 546 | * Run a timeout function. |
| 547 | */ |
| 548 | static void rpc_run_timer(unsigned long ptr) |
| 549 | { |
| 550 | struct rpc_task *task = (struct rpc_task *)ptr; |
Trond Myklebust | 5d00837 | 2008-02-22 16:34:17 -0500 | [diff] [blame] | 551 | struct rpc_wait_queue *queue = task->tk_waitqueue; |
Trond Myklebust | fde95c7 | 2008-02-22 15:09:26 -0500 | [diff] [blame] | 552 | |
Trond Myklebust | 5d00837 | 2008-02-22 16:34:17 -0500 | [diff] [blame] | 553 | spin_lock(&queue->lock); |
| 554 | if (RPC_IS_QUEUED(task) && task->tk_waitqueue == queue) { |
| 555 | dprintk("RPC: %5u timeout\n", task->tk_pid); |
| 556 | task->tk_status = -ETIMEDOUT; |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 557 | rpc_wake_up_task_queue_locked(queue, task); |
Trond Myklebust | fde95c7 | 2008-02-22 15:09:26 -0500 | [diff] [blame] | 558 | } |
Trond Myklebust | 5d00837 | 2008-02-22 16:34:17 -0500 | [diff] [blame] | 559 | spin_unlock(&queue->lock); |
Trond Myklebust | fde95c7 | 2008-02-22 15:09:26 -0500 | [diff] [blame] | 560 | smp_mb__before_clear_bit(); |
| 561 | clear_bit(RPC_TASK_HAS_TIMER, &task->tk_runstate); |
| 562 | smp_mb__after_clear_bit(); |
| 563 | } |
| 564 | |
Trond Myklebust | 8014793 | 2006-08-31 18:24:08 -0400 | [diff] [blame] | 565 | static void __rpc_atrun(struct rpc_task *task) |
| 566 | { |
Trond Myklebust | 5d00837 | 2008-02-22 16:34:17 -0500 | [diff] [blame] | 567 | task->tk_status = 0; |
Trond Myklebust | 8014793 | 2006-08-31 18:24:08 -0400 | [diff] [blame] | 568 | } |
| 569 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | /* |
| 571 | * Run a task at a later time |
| 572 | */ |
Trond Myklebust | 8014793 | 2006-08-31 18:24:08 -0400 | [diff] [blame] | 573 | void rpc_delay(struct rpc_task *task, unsigned long delay) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | { |
| 575 | task->tk_timeout = delay; |
Trond Myklebust | 5d00837 | 2008-02-22 16:34:17 -0500 | [diff] [blame] | 576 | rpc_sleep_on(&delay_queue, task, __rpc_atrun); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 578 | EXPORT_SYMBOL_GPL(rpc_delay); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | /* |
Trond Myklebust | 4ce70ad | 2006-01-03 09:55:05 +0100 | [diff] [blame] | 581 | * Helper to call task->tk_ops->rpc_call_prepare |
| 582 | */ |
| 583 | static void rpc_prepare_task(struct rpc_task *task) |
| 584 | { |
Trond Myklebust | 6d5fcb5 | 2006-10-18 16:01:06 -0400 | [diff] [blame] | 585 | lock_kernel(); |
Trond Myklebust | 4ce70ad | 2006-01-03 09:55:05 +0100 | [diff] [blame] | 586 | task->tk_ops->rpc_call_prepare(task, task->tk_calldata); |
Trond Myklebust | 6d5fcb5 | 2006-10-18 16:01:06 -0400 | [diff] [blame] | 587 | unlock_kernel(); |
Trond Myklebust | 4ce70ad | 2006-01-03 09:55:05 +0100 | [diff] [blame] | 588 | } |
| 589 | |
| 590 | /* |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 591 | * Helper that calls task->tk_ops->rpc_call_done if it exists |
Trond Myklebust | d05fdb0 | 2005-06-22 17:16:19 +0000 | [diff] [blame] | 592 | */ |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 593 | void rpc_exit_task(struct rpc_task *task) |
Trond Myklebust | d05fdb0 | 2005-06-22 17:16:19 +0000 | [diff] [blame] | 594 | { |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 595 | task->tk_action = NULL; |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 596 | if (task->tk_ops->rpc_call_done != NULL) { |
Trond Myklebust | 6d5fcb5 | 2006-10-18 16:01:06 -0400 | [diff] [blame] | 597 | lock_kernel(); |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 598 | task->tk_ops->rpc_call_done(task, task->tk_calldata); |
Trond Myklebust | 6d5fcb5 | 2006-10-18 16:01:06 -0400 | [diff] [blame] | 599 | unlock_kernel(); |
Trond Myklebust | d05fdb0 | 2005-06-22 17:16:19 +0000 | [diff] [blame] | 600 | if (task->tk_action != NULL) { |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 601 | WARN_ON(RPC_ASSASSINATED(task)); |
| 602 | /* Always release the RPC slot and buffer memory */ |
| 603 | xprt_release(task); |
Trond Myklebust | d05fdb0 | 2005-06-22 17:16:19 +0000 | [diff] [blame] | 604 | } |
| 605 | } |
Trond Myklebust | d05fdb0 | 2005-06-22 17:16:19 +0000 | [diff] [blame] | 606 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 607 | EXPORT_SYMBOL_GPL(rpc_exit_task); |
Trond Myklebust | d05fdb0 | 2005-06-22 17:16:19 +0000 | [diff] [blame] | 608 | |
Trond Myklebust | bbd5a1f | 2006-10-18 16:01:05 -0400 | [diff] [blame] | 609 | void rpc_release_calldata(const struct rpc_call_ops *ops, void *calldata) |
| 610 | { |
| 611 | if (ops->rpc_release != NULL) { |
| 612 | lock_kernel(); |
| 613 | ops->rpc_release(calldata); |
| 614 | unlock_kernel(); |
| 615 | } |
| 616 | } |
| 617 | |
Trond Myklebust | d05fdb0 | 2005-06-22 17:16:19 +0000 | [diff] [blame] | 618 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | * This is the RPC `scheduler' (or rather, the finite state machine). |
| 620 | */ |
Trond Myklebust | 2efef83 | 2007-02-03 13:38:41 -0800 | [diff] [blame] | 621 | static void __rpc_execute(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | { |
| 623 | int status = 0; |
| 624 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 625 | dprintk("RPC: %5u __rpc_execute flags=0x%x\n", |
| 626 | task->tk_pid, task->tk_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | |
| 628 | BUG_ON(RPC_IS_QUEUED(task)); |
| 629 | |
Trond Myklebust | d05fdb0 | 2005-06-22 17:16:19 +0000 | [diff] [blame] | 630 | for (;;) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | /* |
| 632 | * Garbage collection of pending timers... |
| 633 | */ |
| 634 | rpc_delete_timer(task); |
| 635 | |
| 636 | /* |
| 637 | * Execute any pending callback. |
| 638 | */ |
| 639 | if (RPC_DO_CALLBACK(task)) { |
| 640 | /* Define a callback save pointer */ |
| 641 | void (*save_callback)(struct rpc_task *); |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 642 | |
| 643 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | * If a callback exists, save it, reset it, |
| 645 | * call it. |
| 646 | * The save is needed to stop from resetting |
| 647 | * another callback set within the callback handler |
| 648 | * - Dave |
| 649 | */ |
| 650 | save_callback=task->tk_callback; |
| 651 | task->tk_callback=NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | save_callback(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | } |
| 654 | |
| 655 | /* |
| 656 | * Perform the next FSM step. |
| 657 | * tk_action may be NULL when the task has been killed |
| 658 | * by someone else. |
| 659 | */ |
| 660 | if (!RPC_IS_QUEUED(task)) { |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 661 | if (task->tk_action == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | break; |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 663 | task->tk_action(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | } |
| 665 | |
| 666 | /* |
| 667 | * Lockless check for whether task is sleeping or not. |
| 668 | */ |
| 669 | if (!RPC_IS_QUEUED(task)) |
| 670 | continue; |
| 671 | rpc_clear_running(task); |
| 672 | if (RPC_IS_ASYNC(task)) { |
| 673 | /* Careful! we may have raced... */ |
| 674 | if (RPC_IS_QUEUED(task)) |
Trond Myklebust | 2efef83 | 2007-02-03 13:38:41 -0800 | [diff] [blame] | 675 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | if (rpc_test_and_set_running(task)) |
Trond Myklebust | 2efef83 | 2007-02-03 13:38:41 -0800 | [diff] [blame] | 677 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | continue; |
| 679 | } |
| 680 | |
| 681 | /* sync task: sleep here */ |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 682 | dprintk("RPC: %5u sync task going to sleep\n", task->tk_pid); |
Trond Myklebust | 96651ab | 2005-06-22 17:16:21 +0000 | [diff] [blame] | 683 | status = out_of_line_wait_on_bit(&task->tk_runstate, |
Matthew Wilcox | 150030b | 2007-12-06 16:24:39 -0500 | [diff] [blame] | 684 | RPC_TASK_QUEUED, rpc_wait_bit_killable, |
| 685 | TASK_KILLABLE); |
Trond Myklebust | 96651ab | 2005-06-22 17:16:21 +0000 | [diff] [blame] | 686 | if (status == -ERESTARTSYS) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | /* |
| 688 | * When a sync task receives a signal, it exits with |
| 689 | * -ERESTARTSYS. In order to catch any callbacks that |
| 690 | * clean up after sleeping on some queue, we don't |
| 691 | * break the loop here, but go around once more. |
| 692 | */ |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 693 | dprintk("RPC: %5u got signal\n", task->tk_pid); |
Trond Myklebust | 96651ab | 2005-06-22 17:16:21 +0000 | [diff] [blame] | 694 | task->tk_flags |= RPC_TASK_KILLED; |
| 695 | rpc_exit(task, -ERESTARTSYS); |
| 696 | rpc_wake_up_task(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | } |
| 698 | rpc_set_running(task); |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 699 | dprintk("RPC: %5u sync task resuming\n", task->tk_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | } |
| 701 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 702 | dprintk("RPC: %5u return %d, status %d\n", task->tk_pid, status, |
| 703 | task->tk_status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | /* Release all resources associated with the task */ |
| 705 | rpc_release_task(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | } |
| 707 | |
| 708 | /* |
| 709 | * User-visible entry point to the scheduler. |
| 710 | * |
| 711 | * This may be called recursively if e.g. an async NFS task updates |
| 712 | * the attributes and finds that dirty pages must be flushed. |
| 713 | * NOTE: Upon exit of this function the task is guaranteed to be |
| 714 | * released. In particular note that tk_release() will have |
| 715 | * been called, so your task memory may have been freed. |
| 716 | */ |
Trond Myklebust | 2efef83 | 2007-02-03 13:38:41 -0800 | [diff] [blame] | 717 | void rpc_execute(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | { |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 719 | rpc_set_active(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | rpc_set_running(task); |
Trond Myklebust | 2efef83 | 2007-02-03 13:38:41 -0800 | [diff] [blame] | 721 | __rpc_execute(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | } |
| 723 | |
David Howells | 65f27f3 | 2006-11-22 14:55:48 +0000 | [diff] [blame] | 724 | static void rpc_async_schedule(struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | { |
David Howells | 65f27f3 | 2006-11-22 14:55:48 +0000 | [diff] [blame] | 726 | __rpc_execute(container_of(work, struct rpc_task, u.tk_work)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | } |
| 728 | |
Chuck Lever | aa3d1fa | 2007-05-08 18:23:28 -0400 | [diff] [blame] | 729 | struct rpc_buffer { |
| 730 | size_t len; |
| 731 | char data[]; |
| 732 | }; |
| 733 | |
Chuck Lever | 0210714 | 2006-01-03 09:55:49 +0100 | [diff] [blame] | 734 | /** |
| 735 | * rpc_malloc - allocate an RPC buffer |
| 736 | * @task: RPC task that will use this buffer |
| 737 | * @size: requested byte size |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | * |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 739 | * To prevent rpciod from hanging, this allocator never sleeps, |
| 740 | * returning NULL if the request cannot be serviced immediately. |
| 741 | * The caller can arrange to sleep in a way that is safe for rpciod. |
| 742 | * |
| 743 | * Most requests are 'small' (under 2KiB) and can be serviced from a |
| 744 | * mempool, ensuring that NFS reads and writes can always proceed, |
| 745 | * and that there is good locality of reference for these buffers. |
| 746 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | * In order to avoid memory starvation triggering more writebacks of |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 748 | * NFS requests, we avoid using GFP_KERNEL. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | */ |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 750 | void *rpc_malloc(struct rpc_task *task, size_t size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | { |
Chuck Lever | aa3d1fa | 2007-05-08 18:23:28 -0400 | [diff] [blame] | 752 | struct rpc_buffer *buf; |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 753 | gfp_t gfp = RPC_IS_SWAPPER(task) ? GFP_ATOMIC : GFP_NOWAIT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | |
Chuck Lever | aa3d1fa | 2007-05-08 18:23:28 -0400 | [diff] [blame] | 755 | size += sizeof(struct rpc_buffer); |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 756 | if (size <= RPC_BUFFER_MAXSIZE) |
| 757 | buf = mempool_alloc(rpc_buffer_mempool, gfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | else |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 759 | buf = kmalloc(size, gfp); |
Peter Zijlstra | ddce40d | 2007-05-09 08:30:11 +0200 | [diff] [blame] | 760 | |
| 761 | if (!buf) |
| 762 | return NULL; |
| 763 | |
Chuck Lever | aa3d1fa | 2007-05-08 18:23:28 -0400 | [diff] [blame] | 764 | buf->len = size; |
Geert Uytterhoeven | 215d067 | 2007-05-08 11:37:26 +0200 | [diff] [blame] | 765 | dprintk("RPC: %5u allocated buffer of size %zu at %p\n", |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 766 | task->tk_pid, size, buf); |
Chuck Lever | aa3d1fa | 2007-05-08 18:23:28 -0400 | [diff] [blame] | 767 | return &buf->data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 769 | EXPORT_SYMBOL_GPL(rpc_malloc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | |
Chuck Lever | 0210714 | 2006-01-03 09:55:49 +0100 | [diff] [blame] | 771 | /** |
| 772 | * rpc_free - free buffer allocated via rpc_malloc |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 773 | * @buffer: buffer to free |
Chuck Lever | 0210714 | 2006-01-03 09:55:49 +0100 | [diff] [blame] | 774 | * |
| 775 | */ |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 776 | void rpc_free(void *buffer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | { |
Chuck Lever | aa3d1fa | 2007-05-08 18:23:28 -0400 | [diff] [blame] | 778 | size_t size; |
| 779 | struct rpc_buffer *buf; |
Chuck Lever | 0210714 | 2006-01-03 09:55:49 +0100 | [diff] [blame] | 780 | |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 781 | if (!buffer) |
| 782 | return; |
Chuck Lever | aa3d1fa | 2007-05-08 18:23:28 -0400 | [diff] [blame] | 783 | |
| 784 | buf = container_of(buffer, struct rpc_buffer, data); |
| 785 | size = buf->len; |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 786 | |
Geert Uytterhoeven | 215d067 | 2007-05-08 11:37:26 +0200 | [diff] [blame] | 787 | dprintk("RPC: freeing buffer of size %zu at %p\n", |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 788 | size, buf); |
Chuck Lever | aa3d1fa | 2007-05-08 18:23:28 -0400 | [diff] [blame] | 789 | |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 790 | if (size <= RPC_BUFFER_MAXSIZE) |
| 791 | mempool_free(buf, rpc_buffer_mempool); |
| 792 | else |
| 793 | kfree(buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 795 | EXPORT_SYMBOL_GPL(rpc_free); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | |
| 797 | /* |
| 798 | * Creation and deletion of RPC task structures |
| 799 | */ |
Trond Myklebust | 47fe064 | 2007-10-25 18:42:55 -0400 | [diff] [blame] | 800 | static void rpc_init_task(struct rpc_task *task, const struct rpc_task_setup *task_setup_data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | { |
| 802 | memset(task, 0, sizeof(*task)); |
Trond Myklebust | fde95c7 | 2008-02-22 15:09:26 -0500 | [diff] [blame] | 803 | setup_timer(&task->tk_timer, rpc_run_timer, (unsigned long)task); |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 804 | atomic_set(&task->tk_count, 1); |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 805 | task->tk_flags = task_setup_data->flags; |
| 806 | task->tk_ops = task_setup_data->callback_ops; |
| 807 | task->tk_calldata = task_setup_data->callback_data; |
Trond Myklebust | 6529eba | 2007-06-14 16:40:14 -0400 | [diff] [blame] | 808 | INIT_LIST_HEAD(&task->tk_task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | |
| 810 | /* Initialize retry counters */ |
| 811 | task->tk_garb_retry = 2; |
| 812 | task->tk_cred_retry = 2; |
| 813 | |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 814 | task->tk_priority = task_setup_data->priority - RPC_PRIORITY_LOW; |
| 815 | task->tk_owner = current->tgid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 816 | |
| 817 | /* Initialize workqueue for async tasks */ |
Trond Myklebust | 32bfb5c | 2008-02-19 20:04:21 -0500 | [diff] [blame] | 818 | task->tk_workqueue = task_setup_data->workqueue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 820 | task->tk_client = task_setup_data->rpc_client; |
| 821 | if (task->tk_client != NULL) { |
| 822 | kref_get(&task->tk_client->cl_kref); |
| 823 | if (task->tk_client->cl_softrtry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 824 | task->tk_flags |= RPC_TASK_SOFT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | } |
| 826 | |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 827 | if (task->tk_ops->rpc_call_prepare != NULL) |
| 828 | task->tk_action = rpc_prepare_task; |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 829 | |
Trond Myklebust | b3ef8b3 | 2007-10-25 18:32:34 -0400 | [diff] [blame] | 830 | if (task_setup_data->rpc_message != NULL) { |
| 831 | memcpy(&task->tk_msg, task_setup_data->rpc_message, sizeof(task->tk_msg)); |
| 832 | /* Bind the user cred */ |
| 833 | if (task->tk_msg.rpc_cred != NULL) |
| 834 | rpcauth_holdcred(task); |
| 835 | else |
| 836 | rpcauth_bindcred(task); |
| 837 | if (task->tk_action == NULL) |
| 838 | rpc_call_start(task); |
| 839 | } |
| 840 | |
Chuck Lever | ef759a2 | 2006-03-20 13:44:17 -0500 | [diff] [blame] | 841 | /* starting timestamp */ |
| 842 | task->tk_start = jiffies; |
| 843 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 844 | dprintk("RPC: new task initialized, procpid %u\n", |
Pavel Emelyanov | ba25f9d | 2007-10-18 23:40:40 -0700 | [diff] [blame] | 845 | task_pid_nr(current)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | } |
| 847 | |
| 848 | static struct rpc_task * |
| 849 | rpc_alloc_task(void) |
| 850 | { |
| 851 | return (struct rpc_task *)mempool_alloc(rpc_task_mempool, GFP_NOFS); |
| 852 | } |
| 853 | |
Trond Myklebust | 32bfb5c | 2008-02-19 20:04:21 -0500 | [diff] [blame] | 854 | static void rpc_free_task_rcu(struct rcu_head *rcu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | { |
Trond Myklebust | 8aca67f | 2006-11-13 16:23:44 -0500 | [diff] [blame] | 856 | struct rpc_task *task = container_of(rcu, struct rpc_task, u.tk_rcu); |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 857 | dprintk("RPC: %5u freeing task\n", task->tk_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | mempool_free(task, rpc_task_mempool); |
| 859 | } |
| 860 | |
| 861 | /* |
Trond Myklebust | 90c5755 | 2007-06-09 19:49:36 -0400 | [diff] [blame] | 862 | * Create a new task for the specified client. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | */ |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 864 | struct rpc_task *rpc_new_task(const struct rpc_task_setup *setup_data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | { |
Trond Myklebust | e8f5d77 | 2007-10-25 18:42:53 -0400 | [diff] [blame] | 866 | struct rpc_task *task = setup_data->task; |
| 867 | unsigned short flags = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 868 | |
Trond Myklebust | e8f5d77 | 2007-10-25 18:42:53 -0400 | [diff] [blame] | 869 | if (task == NULL) { |
| 870 | task = rpc_alloc_task(); |
| 871 | if (task == NULL) |
| 872 | goto out; |
| 873 | flags = RPC_TASK_DYNAMIC; |
| 874 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 876 | rpc_init_task(task, setup_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 877 | |
Trond Myklebust | e8f5d77 | 2007-10-25 18:42:53 -0400 | [diff] [blame] | 878 | task->tk_flags |= flags; |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 879 | dprintk("RPC: allocated task %p\n", task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | out: |
| 881 | return task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | } |
| 883 | |
Trond Myklebust | 32bfb5c | 2008-02-19 20:04:21 -0500 | [diff] [blame] | 884 | static void rpc_free_task(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | { |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 886 | const struct rpc_call_ops *tk_ops = task->tk_ops; |
| 887 | void *calldata = task->tk_calldata; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | |
Trond Myklebust | 32bfb5c | 2008-02-19 20:04:21 -0500 | [diff] [blame] | 889 | if (task->tk_flags & RPC_TASK_DYNAMIC) |
| 890 | call_rcu_bh(&task->u.tk_rcu, rpc_free_task_rcu); |
| 891 | rpc_release_calldata(tk_ops, calldata); |
| 892 | } |
| 893 | |
| 894 | static void rpc_async_release(struct work_struct *work) |
| 895 | { |
| 896 | rpc_free_task(container_of(work, struct rpc_task, u.tk_work)); |
| 897 | } |
| 898 | |
| 899 | void rpc_put_task(struct rpc_task *task) |
| 900 | { |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 901 | if (!atomic_dec_and_test(&task->tk_count)) |
| 902 | return; |
| 903 | /* Release resources */ |
| 904 | if (task->tk_rqstp) |
| 905 | xprt_release(task); |
| 906 | if (task->tk_msg.rpc_cred) |
| 907 | rpcauth_unbindcred(task); |
| 908 | if (task->tk_client) { |
| 909 | rpc_release_client(task->tk_client); |
| 910 | task->tk_client = NULL; |
| 911 | } |
Trond Myklebust | 32bfb5c | 2008-02-19 20:04:21 -0500 | [diff] [blame] | 912 | if (task->tk_workqueue != NULL) { |
| 913 | INIT_WORK(&task->u.tk_work, rpc_async_release); |
| 914 | queue_work(task->tk_workqueue, &task->u.tk_work); |
| 915 | } else |
| 916 | rpc_free_task(task); |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 917 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 918 | EXPORT_SYMBOL_GPL(rpc_put_task); |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 919 | |
Trond Myklebust | bde8f00 | 2007-01-24 11:54:53 -0800 | [diff] [blame] | 920 | static void rpc_release_task(struct rpc_task *task) |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 921 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 922 | #ifdef RPC_DEBUG |
| 923 | BUG_ON(task->tk_magic != RPC_TASK_MAGIC_ID); |
| 924 | #endif |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 925 | dprintk("RPC: %5u release task\n", task->tk_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 926 | |
Trond Myklebust | 6529eba | 2007-06-14 16:40:14 -0400 | [diff] [blame] | 927 | if (!list_empty(&task->tk_task)) { |
Trond Myklebust | 4bef61f | 2007-06-16 14:17:01 -0400 | [diff] [blame] | 928 | struct rpc_clnt *clnt = task->tk_client; |
Trond Myklebust | 6529eba | 2007-06-14 16:40:14 -0400 | [diff] [blame] | 929 | /* Remove from client task list */ |
Trond Myklebust | 4bef61f | 2007-06-16 14:17:01 -0400 | [diff] [blame] | 930 | spin_lock(&clnt->cl_lock); |
Trond Myklebust | 6529eba | 2007-06-14 16:40:14 -0400 | [diff] [blame] | 931 | list_del(&task->tk_task); |
Trond Myklebust | 4bef61f | 2007-06-16 14:17:01 -0400 | [diff] [blame] | 932 | spin_unlock(&clnt->cl_lock); |
Trond Myklebust | 6529eba | 2007-06-14 16:40:14 -0400 | [diff] [blame] | 933 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 934 | BUG_ON (RPC_IS_QUEUED(task)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 935 | |
| 936 | /* Synchronously delete any running timer */ |
| 937 | rpc_delete_timer(task); |
| 938 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | #ifdef RPC_DEBUG |
| 940 | task->tk_magic = 0; |
| 941 | #endif |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 942 | /* Wake up anyone who is waiting for task completion */ |
| 943 | rpc_mark_complete_task(task); |
| 944 | |
| 945 | rpc_put_task(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | } |
| 947 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 948 | /* |
| 949 | * Kill all tasks for the given client. |
| 950 | * XXX: kill their descendants as well? |
| 951 | */ |
Trond Myklebust | 4bef61f | 2007-06-16 14:17:01 -0400 | [diff] [blame] | 952 | void rpc_killall_tasks(struct rpc_clnt *clnt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 953 | { |
| 954 | struct rpc_task *rovr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 955 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 956 | |
Trond Myklebust | 4bef61f | 2007-06-16 14:17:01 -0400 | [diff] [blame] | 957 | if (list_empty(&clnt->cl_tasks)) |
| 958 | return; |
| 959 | dprintk("RPC: killing all tasks for client %p\n", clnt); |
| 960 | /* |
| 961 | * Spin lock all_tasks to prevent changes... |
| 962 | */ |
| 963 | spin_lock(&clnt->cl_lock); |
| 964 | list_for_each_entry(rovr, &clnt->cl_tasks, tk_task) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 965 | if (! RPC_IS_ACTIVATED(rovr)) |
| 966 | continue; |
Trond Myklebust | 6529eba | 2007-06-14 16:40:14 -0400 | [diff] [blame] | 967 | if (!(rovr->tk_flags & RPC_TASK_KILLED)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 968 | rovr->tk_flags |= RPC_TASK_KILLED; |
| 969 | rpc_exit(rovr, -EIO); |
| 970 | rpc_wake_up_task(rovr); |
| 971 | } |
| 972 | } |
Trond Myklebust | 4bef61f | 2007-06-16 14:17:01 -0400 | [diff] [blame] | 973 | spin_unlock(&clnt->cl_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 974 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 975 | EXPORT_SYMBOL_GPL(rpc_killall_tasks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 976 | |
Trond Myklebust | b247bbf | 2007-07-19 16:32:20 -0400 | [diff] [blame] | 977 | int rpciod_up(void) |
| 978 | { |
| 979 | return try_module_get(THIS_MODULE) ? 0 : -EINVAL; |
| 980 | } |
| 981 | |
| 982 | void rpciod_down(void) |
| 983 | { |
| 984 | module_put(THIS_MODULE); |
| 985 | } |
| 986 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 987 | /* |
Trond Myklebust | b247bbf | 2007-07-19 16:32:20 -0400 | [diff] [blame] | 988 | * Start up the rpciod workqueue. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 989 | */ |
Trond Myklebust | b247bbf | 2007-07-19 16:32:20 -0400 | [diff] [blame] | 990 | static int rpciod_start(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | { |
| 992 | struct workqueue_struct *wq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 993 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 994 | /* |
| 995 | * Create the rpciod thread and wait for it to start. |
| 996 | */ |
Trond Myklebust | ab418d7 | 2007-06-14 17:08:36 -0400 | [diff] [blame] | 997 | dprintk("RPC: creating workqueue rpciod\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 998 | wq = create_workqueue("rpciod"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 999 | rpciod_workqueue = wq; |
Trond Myklebust | b247bbf | 2007-07-19 16:32:20 -0400 | [diff] [blame] | 1000 | return rpciod_workqueue != NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1001 | } |
| 1002 | |
Trond Myklebust | b247bbf | 2007-07-19 16:32:20 -0400 | [diff] [blame] | 1003 | static void rpciod_stop(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | { |
Trond Myklebust | b247bbf | 2007-07-19 16:32:20 -0400 | [diff] [blame] | 1005 | struct workqueue_struct *wq = NULL; |
Trond Myklebust | ab418d7 | 2007-06-14 17:08:36 -0400 | [diff] [blame] | 1006 | |
Trond Myklebust | b247bbf | 2007-07-19 16:32:20 -0400 | [diff] [blame] | 1007 | if (rpciod_workqueue == NULL) |
| 1008 | return; |
Trond Myklebust | ab418d7 | 2007-06-14 17:08:36 -0400 | [diff] [blame] | 1009 | dprintk("RPC: destroying workqueue rpciod\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1010 | |
Trond Myklebust | b247bbf | 2007-07-19 16:32:20 -0400 | [diff] [blame] | 1011 | wq = rpciod_workqueue; |
| 1012 | rpciod_workqueue = NULL; |
| 1013 | destroy_workqueue(wq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1014 | } |
| 1015 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1016 | void |
| 1017 | rpc_destroy_mempool(void) |
| 1018 | { |
Trond Myklebust | b247bbf | 2007-07-19 16:32:20 -0400 | [diff] [blame] | 1019 | rpciod_stop(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1020 | if (rpc_buffer_mempool) |
| 1021 | mempool_destroy(rpc_buffer_mempool); |
| 1022 | if (rpc_task_mempool) |
| 1023 | mempool_destroy(rpc_task_mempool); |
Alexey Dobriyan | 1a1d92c | 2006-09-27 01:49:40 -0700 | [diff] [blame] | 1024 | if (rpc_task_slabp) |
| 1025 | kmem_cache_destroy(rpc_task_slabp); |
| 1026 | if (rpc_buffer_slabp) |
| 1027 | kmem_cache_destroy(rpc_buffer_slabp); |
Trond Myklebust | f6a1cc8 | 2008-02-22 17:06:55 -0500 | [diff] [blame^] | 1028 | rpc_destroy_wait_queue(&delay_queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1029 | } |
| 1030 | |
| 1031 | int |
| 1032 | rpc_init_mempool(void) |
| 1033 | { |
Trond Myklebust | f6a1cc8 | 2008-02-22 17:06:55 -0500 | [diff] [blame^] | 1034 | /* |
| 1035 | * The following is not strictly a mempool initialisation, |
| 1036 | * but there is no harm in doing it here |
| 1037 | */ |
| 1038 | rpc_init_wait_queue(&delay_queue, "delayq"); |
| 1039 | if (!rpciod_start()) |
| 1040 | goto err_nomem; |
| 1041 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1042 | rpc_task_slabp = kmem_cache_create("rpc_tasks", |
| 1043 | sizeof(struct rpc_task), |
| 1044 | 0, SLAB_HWCACHE_ALIGN, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 1045 | NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1046 | if (!rpc_task_slabp) |
| 1047 | goto err_nomem; |
| 1048 | rpc_buffer_slabp = kmem_cache_create("rpc_buffers", |
| 1049 | RPC_BUFFER_MAXSIZE, |
| 1050 | 0, SLAB_HWCACHE_ALIGN, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 1051 | NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1052 | if (!rpc_buffer_slabp) |
| 1053 | goto err_nomem; |
Matthew Dobson | 93d2341 | 2006-03-26 01:37:50 -0800 | [diff] [blame] | 1054 | rpc_task_mempool = mempool_create_slab_pool(RPC_TASK_POOLSIZE, |
| 1055 | rpc_task_slabp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1056 | if (!rpc_task_mempool) |
| 1057 | goto err_nomem; |
Matthew Dobson | 93d2341 | 2006-03-26 01:37:50 -0800 | [diff] [blame] | 1058 | rpc_buffer_mempool = mempool_create_slab_pool(RPC_BUFFER_POOLSIZE, |
| 1059 | rpc_buffer_slabp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1060 | if (!rpc_buffer_mempool) |
| 1061 | goto err_nomem; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1062 | return 0; |
| 1063 | err_nomem: |
| 1064 | rpc_destroy_mempool(); |
| 1065 | return -ENOMEM; |
| 1066 | } |