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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <linux/spinlock.h> |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 20 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | |
| 22 | #include <linux/sunrpc/clnt.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | |
Benny Halevy | 6951867 | 2009-09-10 12:25:04 +0300 | [diff] [blame] | 24 | #include "sunrpc.h" |
| 25 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #ifdef RPC_DEBUG |
| 27 | #define RPCDBG_FACILITY RPCDBG_SCHED |
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); |
Trond Myklebust | 36df9aa | 2007-07-18 16:18:52 -0400 | [diff] [blame] | 43 | static void __rpc_queue_timer_fn(unsigned long ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | |
| 45 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | * RPC tasks sit here while waiting for conditions to improve. |
| 47 | */ |
Trond Myklebust | a4a8749 | 2007-07-18 13:24:19 -0400 | [diff] [blame] | 48 | static struct rpc_wait_queue delay_queue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | |
| 50 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | * rpciod-related stuff |
| 52 | */ |
Trond Myklebust | 24c5d9d | 2006-03-20 13:44:08 -0500 | [diff] [blame] | 53 | struct workqueue_struct *rpciod_workqueue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | |
| 55 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | * Disable the timer for a given RPC task. Should be called with |
| 57 | * queue->lock and bh_disabled in order to avoid races within |
| 58 | * rpc_run_timer(). |
| 59 | */ |
Trond Myklebust | 5d00837 | 2008-02-22 16:34:17 -0500 | [diff] [blame] | 60 | static void |
Trond Myklebust | eb276c0 | 2008-02-22 17:27:59 -0500 | [diff] [blame] | 61 | __rpc_disable_timer(struct rpc_wait_queue *queue, struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | { |
Trond Myklebust | 36df9aa | 2007-07-18 16:18:52 -0400 | [diff] [blame] | 63 | if (task->tk_timeout == 0) |
| 64 | return; |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 65 | dprintk("RPC: %5u disabling timer\n", task->tk_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | task->tk_timeout = 0; |
Trond Myklebust | 36df9aa | 2007-07-18 16:18:52 -0400 | [diff] [blame] | 67 | list_del(&task->u.tk_wait.timer_list); |
Trond Myklebust | eb276c0 | 2008-02-22 17:27:59 -0500 | [diff] [blame] | 68 | if (list_empty(&queue->timer_list.list)) |
| 69 | del_timer(&queue->timer_list.timer); |
Trond Myklebust | 36df9aa | 2007-07-18 16:18:52 -0400 | [diff] [blame] | 70 | } |
| 71 | |
| 72 | static void |
| 73 | rpc_set_queue_timer(struct rpc_wait_queue *queue, unsigned long expires) |
| 74 | { |
| 75 | queue->timer_list.expires = expires; |
| 76 | mod_timer(&queue->timer_list.timer, expires); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | } |
| 78 | |
| 79 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | * Set up a timer for the current task. |
| 81 | */ |
Trond Myklebust | 5d00837 | 2008-02-22 16:34:17 -0500 | [diff] [blame] | 82 | static void |
Trond Myklebust | eb276c0 | 2008-02-22 17:27:59 -0500 | [diff] [blame] | 83 | __rpc_add_timer(struct rpc_wait_queue *queue, struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | { |
| 85 | if (!task->tk_timeout) |
| 86 | return; |
| 87 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 88 | dprintk("RPC: %5u setting alarm for %lu ms\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | task->tk_pid, task->tk_timeout * 1000 / HZ); |
| 90 | |
Trond Myklebust | eb276c0 | 2008-02-22 17:27:59 -0500 | [diff] [blame] | 91 | task->u.tk_wait.expires = jiffies + task->tk_timeout; |
| 92 | if (list_empty(&queue->timer_list.list) || time_before(task->u.tk_wait.expires, queue->timer_list.expires)) |
| 93 | rpc_set_queue_timer(queue, task->u.tk_wait.expires); |
| 94 | list_add(&task->u.tk_wait.timer_list, &queue->timer_list.list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | } |
| 157 | |
| 158 | /* |
| 159 | * Remove request from queue. |
| 160 | * Note: must be called with spin lock held. |
| 161 | */ |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 162 | 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] | 163 | { |
Trond Myklebust | eb276c0 | 2008-02-22 17:27:59 -0500 | [diff] [blame] | 164 | __rpc_disable_timer(queue, task); |
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); |
Trond Myklebust | 36df9aa | 2007-07-18 16:18:52 -0400 | [diff] [blame] | 167 | list_del(&task->u.tk_wait.list); |
Chuck Lever | e19b63d | 2006-03-20 13:44:15 -0500 | [diff] [blame] | 168 | queue->qlen--; |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 169 | dprintk("RPC: %5u removed from queue %p \"%s\"\n", |
| 170 | task->tk_pid, queue, rpc_qname(queue)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | } |
| 172 | |
| 173 | static inline void rpc_set_waitqueue_priority(struct rpc_wait_queue *queue, int priority) |
| 174 | { |
| 175 | queue->priority = priority; |
| 176 | queue->count = 1 << (priority * 2); |
| 177 | } |
| 178 | |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 179 | 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] | 180 | { |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 181 | queue->owner = pid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | queue->nr = RPC_BATCH_COUNT; |
| 183 | } |
| 184 | |
| 185 | static inline void rpc_reset_waitqueue_priority(struct rpc_wait_queue *queue) |
| 186 | { |
| 187 | rpc_set_waitqueue_priority(queue, queue->maxpriority); |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 188 | rpc_set_waitqueue_owner(queue, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | } |
| 190 | |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 191 | 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] | 192 | { |
| 193 | int i; |
| 194 | |
| 195 | spin_lock_init(&queue->lock); |
| 196 | for (i = 0; i < ARRAY_SIZE(queue->tasks); i++) |
| 197 | INIT_LIST_HEAD(&queue->tasks[i]); |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 198 | queue->maxpriority = nr_queues - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | rpc_reset_waitqueue_priority(queue); |
Trond Myklebust | 36df9aa | 2007-07-18 16:18:52 -0400 | [diff] [blame] | 200 | queue->qlen = 0; |
| 201 | setup_timer(&queue->timer_list.timer, __rpc_queue_timer_fn, (unsigned long)queue); |
| 202 | INIT_LIST_HEAD(&queue->timer_list.list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | #ifdef RPC_DEBUG |
| 204 | queue->name = qname; |
| 205 | #endif |
| 206 | } |
| 207 | |
| 208 | void rpc_init_priority_wait_queue(struct rpc_wait_queue *queue, const char *qname) |
| 209 | { |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 210 | __rpc_init_priority_wait_queue(queue, qname, RPC_NR_PRIORITY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | } |
Alexandros Batsakis | 689cf5c | 2009-12-14 21:27:56 -0800 | [diff] [blame] | 212 | EXPORT_SYMBOL_GPL(rpc_init_priority_wait_queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | |
| 214 | void rpc_init_wait_queue(struct rpc_wait_queue *queue, const char *qname) |
| 215 | { |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 216 | __rpc_init_priority_wait_queue(queue, qname, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 218 | EXPORT_SYMBOL_GPL(rpc_init_wait_queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | |
Trond Myklebust | f6a1cc8 | 2008-02-22 17:06:55 -0500 | [diff] [blame] | 220 | void rpc_destroy_wait_queue(struct rpc_wait_queue *queue) |
| 221 | { |
Trond Myklebust | 36df9aa | 2007-07-18 16:18:52 -0400 | [diff] [blame] | 222 | del_timer_sync(&queue->timer_list.timer); |
Trond Myklebust | f6a1cc8 | 2008-02-22 17:06:55 -0500 | [diff] [blame] | 223 | } |
| 224 | EXPORT_SYMBOL_GPL(rpc_destroy_wait_queue); |
| 225 | |
Matthew Wilcox | 150030b | 2007-12-06 16:24:39 -0500 | [diff] [blame] | 226 | static int rpc_wait_bit_killable(void *word) |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 227 | { |
Matthew Wilcox | 150030b | 2007-12-06 16:24:39 -0500 | [diff] [blame] | 228 | if (fatal_signal_pending(current)) |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 229 | return -ERESTARTSYS; |
| 230 | schedule(); |
| 231 | return 0; |
| 232 | } |
| 233 | |
Trond Myklebust | c44fe70 | 2007-06-16 14:17:01 -0400 | [diff] [blame] | 234 | #ifdef RPC_DEBUG |
| 235 | static void rpc_task_set_debuginfo(struct rpc_task *task) |
| 236 | { |
| 237 | static atomic_t rpc_pid; |
| 238 | |
Trond Myklebust | c44fe70 | 2007-06-16 14:17:01 -0400 | [diff] [blame] | 239 | task->tk_pid = atomic_inc_return(&rpc_pid); |
| 240 | } |
| 241 | #else |
| 242 | static inline void rpc_task_set_debuginfo(struct rpc_task *task) |
| 243 | { |
| 244 | } |
| 245 | #endif |
| 246 | |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 247 | static void rpc_set_active(struct rpc_task *task) |
| 248 | { |
Trond Myklebust | c44fe70 | 2007-06-16 14:17:01 -0400 | [diff] [blame] | 249 | rpc_task_set_debuginfo(task); |
Trond Myklebust | 58f9612 | 2010-07-31 14:29:08 -0400 | [diff] [blame] | 250 | set_bit(RPC_TASK_ACTIVE, &task->tk_runstate); |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 251 | } |
| 252 | |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 253 | /* |
| 254 | * Mark an RPC call as having completed by clearing the 'active' bit |
| 255 | */ |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 256 | static void rpc_mark_complete_task(struct rpc_task *task) |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 257 | { |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 258 | smp_mb__before_clear_bit(); |
| 259 | clear_bit(RPC_TASK_ACTIVE, &task->tk_runstate); |
| 260 | smp_mb__after_clear_bit(); |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 261 | wake_up_bit(&task->tk_runstate, RPC_TASK_ACTIVE); |
| 262 | } |
| 263 | |
| 264 | /* |
| 265 | * Allow callers to wait for completion of an RPC call |
| 266 | */ |
| 267 | int __rpc_wait_for_completion_task(struct rpc_task *task, int (*action)(void *)) |
| 268 | { |
| 269 | if (action == NULL) |
Matthew Wilcox | 150030b | 2007-12-06 16:24:39 -0500 | [diff] [blame] | 270 | action = rpc_wait_bit_killable; |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 271 | return wait_on_bit(&task->tk_runstate, RPC_TASK_ACTIVE, |
Matthew Wilcox | 150030b | 2007-12-06 16:24:39 -0500 | [diff] [blame] | 272 | action, TASK_KILLABLE); |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 273 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 274 | EXPORT_SYMBOL_GPL(__rpc_wait_for_completion_task); |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 275 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | /* |
| 277 | * Make an RPC task runnable. |
| 278 | * |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 279 | * Note: If the task is ASYNC, this must be called with |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | * the spinlock held to protect the wait queue operation. |
| 281 | */ |
| 282 | static void rpc_make_runnable(struct rpc_task *task) |
| 283 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | rpc_clear_queued(task); |
Christophe Saout | cc4dc59e | 2006-11-05 18:42:48 +0100 | [diff] [blame] | 285 | if (rpc_test_and_set_running(task)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | return; |
| 287 | if (RPC_IS_ASYNC(task)) { |
| 288 | int status; |
| 289 | |
David Howells | 65f27f3 | 2006-11-22 14:55:48 +0000 | [diff] [blame] | 290 | INIT_WORK(&task->u.tk_work, rpc_async_schedule); |
Trond Myklebust | 32bfb5c | 2008-02-19 20:04:21 -0500 | [diff] [blame] | 291 | status = queue_work(rpciod_workqueue, &task->u.tk_work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | if (status < 0) { |
| 293 | printk(KERN_WARNING "RPC: failed to add task to queue: error: %d!\n", status); |
| 294 | task->tk_status = status; |
| 295 | return; |
| 296 | } |
| 297 | } else |
Trond Myklebust | 96651ab | 2005-06-22 17:16:21 +0000 | [diff] [blame] | 298 | wake_up_bit(&task->tk_runstate, RPC_TASK_QUEUED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | } |
| 300 | |
| 301 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | * Prepare for sleeping on a wait queue. |
| 303 | * By always appending tasks to the list we ensure FIFO behavior. |
| 304 | * NB: An RPC task will only receive interrupt-driven events as long |
| 305 | * as it's on a wait queue. |
| 306 | */ |
| 307 | 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] | 308 | rpc_action action) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | { |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 310 | dprintk("RPC: %5u sleep_on(queue \"%s\" time %lu)\n", |
| 311 | task->tk_pid, rpc_qname(q), jiffies); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | __rpc_add_wait_queue(q, task); |
| 314 | |
| 315 | BUG_ON(task->tk_callback != NULL); |
| 316 | task->tk_callback = action; |
Trond Myklebust | eb276c0 | 2008-02-22 17:27:59 -0500 | [diff] [blame] | 317 | __rpc_add_timer(q, task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | } |
| 319 | |
| 320 | 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] | 321 | rpc_action action) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | { |
Trond Myklebust | 58f9612 | 2010-07-31 14:29:08 -0400 | [diff] [blame] | 323 | /* We shouldn't ever put an inactive task to sleep */ |
| 324 | BUG_ON(!RPC_IS_ACTIVATED(task)); |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 325 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | /* |
| 327 | * Protect the queue operations. |
| 328 | */ |
| 329 | spin_lock_bh(&q->lock); |
Trond Myklebust | 5d00837 | 2008-02-22 16:34:17 -0500 | [diff] [blame] | 330 | __rpc_sleep_on(q, task, action); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | spin_unlock_bh(&q->lock); |
| 332 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 333 | EXPORT_SYMBOL_GPL(rpc_sleep_on); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | |
| 335 | /** |
| 336 | * __rpc_do_wake_up_task - wake up a single rpc_task |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 337 | * @queue: wait queue |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | * @task: task to be woken up |
| 339 | * |
| 340 | * Caller must hold queue->lock, and have cleared the task queued flag. |
| 341 | */ |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 342 | 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] | 343 | { |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 344 | dprintk("RPC: %5u __rpc_wake_up_task (now %lu)\n", |
| 345 | task->tk_pid, jiffies); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | /* Has the task been executed yet? If not, we cannot wake it up! */ |
| 348 | if (!RPC_IS_ACTIVATED(task)) { |
| 349 | printk(KERN_ERR "RPC: Inactive task (%p) being woken up!\n", task); |
| 350 | return; |
| 351 | } |
| 352 | |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 353 | __rpc_remove_wait_queue(queue, task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | |
| 355 | rpc_make_runnable(task); |
| 356 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 357 | dprintk("RPC: __rpc_wake_up_task done\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | } |
| 359 | |
| 360 | /* |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 361 | * Wake up a queued task while the queue lock is being held |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | */ |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 363 | 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] | 364 | { |
Trond Myklebust | f5fb7b06 | 2008-02-25 21:40:50 -0800 | [diff] [blame] | 365 | if (RPC_IS_QUEUED(task) && task->tk_waitqueue == queue) |
| 366 | __rpc_do_wake_up_task(queue, task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | } |
| 368 | |
| 369 | /* |
Alexandros Batsakis | 48f1861 | 2009-12-14 21:27:53 -0800 | [diff] [blame] | 370 | * Tests whether rpc queue is empty |
| 371 | */ |
| 372 | int rpc_queue_empty(struct rpc_wait_queue *queue) |
| 373 | { |
| 374 | int res; |
| 375 | |
| 376 | spin_lock_bh(&queue->lock); |
| 377 | res = queue->qlen; |
| 378 | spin_unlock_bh(&queue->lock); |
| 379 | return (res == 0); |
| 380 | } |
| 381 | EXPORT_SYMBOL_GPL(rpc_queue_empty); |
| 382 | |
| 383 | /* |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 384 | * Wake up a task on a specific queue |
| 385 | */ |
| 386 | void rpc_wake_up_queued_task(struct rpc_wait_queue *queue, struct rpc_task *task) |
| 387 | { |
Trond Myklebust | 5e4424a | 2008-02-25 21:53:49 -0800 | [diff] [blame] | 388 | spin_lock_bh(&queue->lock); |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 389 | rpc_wake_up_task_queue_locked(queue, task); |
Trond Myklebust | 5e4424a | 2008-02-25 21:53:49 -0800 | [diff] [blame] | 390 | spin_unlock_bh(&queue->lock); |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 391 | } |
| 392 | EXPORT_SYMBOL_GPL(rpc_wake_up_queued_task); |
| 393 | |
| 394 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | * Wake up the next task on a priority queue. |
| 396 | */ |
| 397 | static struct rpc_task * __rpc_wake_up_next_priority(struct rpc_wait_queue *queue) |
| 398 | { |
| 399 | struct list_head *q; |
| 400 | struct rpc_task *task; |
| 401 | |
| 402 | /* |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 403 | * Service a batch of tasks from a single owner. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | */ |
| 405 | q = &queue->tasks[queue->priority]; |
| 406 | if (!list_empty(q)) { |
| 407 | task = list_entry(q->next, struct rpc_task, u.tk_wait.list); |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 408 | if (queue->owner == task->tk_owner) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | if (--queue->nr) |
| 410 | goto out; |
| 411 | list_move_tail(&task->u.tk_wait.list, q); |
| 412 | } |
| 413 | /* |
| 414 | * Check if we need to switch queues. |
| 415 | */ |
| 416 | if (--queue->count) |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 417 | goto new_owner; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | } |
| 419 | |
| 420 | /* |
| 421 | * Service the next queue. |
| 422 | */ |
| 423 | do { |
| 424 | if (q == &queue->tasks[0]) |
| 425 | q = &queue->tasks[queue->maxpriority]; |
| 426 | else |
| 427 | q = q - 1; |
| 428 | if (!list_empty(q)) { |
| 429 | task = list_entry(q->next, struct rpc_task, u.tk_wait.list); |
| 430 | goto new_queue; |
| 431 | } |
| 432 | } while (q != &queue->tasks[queue->priority]); |
| 433 | |
| 434 | rpc_reset_waitqueue_priority(queue); |
| 435 | return NULL; |
| 436 | |
| 437 | new_queue: |
| 438 | rpc_set_waitqueue_priority(queue, (unsigned int)(q - &queue->tasks[0])); |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 439 | new_owner: |
| 440 | rpc_set_waitqueue_owner(queue, task->tk_owner); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | out: |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 442 | rpc_wake_up_task_queue_locked(queue, task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | return task; |
| 444 | } |
| 445 | |
| 446 | /* |
| 447 | * Wake up the next task on the wait queue. |
| 448 | */ |
| 449 | struct rpc_task * rpc_wake_up_next(struct rpc_wait_queue *queue) |
| 450 | { |
| 451 | struct rpc_task *task = NULL; |
| 452 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 453 | dprintk("RPC: wake_up_next(%p \"%s\")\n", |
| 454 | queue, rpc_qname(queue)); |
Trond Myklebust | 5e4424a | 2008-02-25 21:53:49 -0800 | [diff] [blame] | 455 | spin_lock_bh(&queue->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | if (RPC_IS_PRIORITY(queue)) |
| 457 | task = __rpc_wake_up_next_priority(queue); |
| 458 | else { |
| 459 | task_for_first(task, &queue->tasks[0]) |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 460 | rpc_wake_up_task_queue_locked(queue, task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | } |
Trond Myklebust | 5e4424a | 2008-02-25 21:53:49 -0800 | [diff] [blame] | 462 | spin_unlock_bh(&queue->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | |
| 464 | return task; |
| 465 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 466 | EXPORT_SYMBOL_GPL(rpc_wake_up_next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | |
| 468 | /** |
| 469 | * rpc_wake_up - wake up all rpc_tasks |
| 470 | * @queue: rpc_wait_queue on which the tasks are sleeping |
| 471 | * |
| 472 | * Grabs queue->lock |
| 473 | */ |
| 474 | void rpc_wake_up(struct rpc_wait_queue *queue) |
| 475 | { |
Trond Myklebust | e6d83d5 | 2006-03-13 21:20:48 -0800 | [diff] [blame] | 476 | struct rpc_task *task, *next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | struct list_head *head; |
Trond Myklebust | e6d83d5 | 2006-03-13 21:20:48 -0800 | [diff] [blame] | 478 | |
Trond Myklebust | 5e4424a | 2008-02-25 21:53:49 -0800 | [diff] [blame] | 479 | spin_lock_bh(&queue->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | head = &queue->tasks[queue->maxpriority]; |
| 481 | for (;;) { |
Trond Myklebust | e6d83d5 | 2006-03-13 21:20:48 -0800 | [diff] [blame] | 482 | list_for_each_entry_safe(task, next, head, u.tk_wait.list) |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 483 | rpc_wake_up_task_queue_locked(queue, task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | if (head == &queue->tasks[0]) |
| 485 | break; |
| 486 | head--; |
| 487 | } |
Trond Myklebust | 5e4424a | 2008-02-25 21:53:49 -0800 | [diff] [blame] | 488 | spin_unlock_bh(&queue->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 490 | EXPORT_SYMBOL_GPL(rpc_wake_up); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | |
| 492 | /** |
| 493 | * rpc_wake_up_status - wake up all rpc_tasks and set their status value. |
| 494 | * @queue: rpc_wait_queue on which the tasks are sleeping |
| 495 | * @status: status value to set |
| 496 | * |
| 497 | * Grabs queue->lock |
| 498 | */ |
| 499 | void rpc_wake_up_status(struct rpc_wait_queue *queue, int status) |
| 500 | { |
Trond Myklebust | e6d83d5 | 2006-03-13 21:20:48 -0800 | [diff] [blame] | 501 | struct rpc_task *task, *next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | struct list_head *head; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | |
Trond Myklebust | 5e4424a | 2008-02-25 21:53:49 -0800 | [diff] [blame] | 504 | spin_lock_bh(&queue->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | head = &queue->tasks[queue->maxpriority]; |
| 506 | for (;;) { |
Trond Myklebust | e6d83d5 | 2006-03-13 21:20:48 -0800 | [diff] [blame] | 507 | list_for_each_entry_safe(task, next, head, u.tk_wait.list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | task->tk_status = status; |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 509 | rpc_wake_up_task_queue_locked(queue, task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | } |
| 511 | if (head == &queue->tasks[0]) |
| 512 | break; |
| 513 | head--; |
| 514 | } |
Trond Myklebust | 5e4424a | 2008-02-25 21:53:49 -0800 | [diff] [blame] | 515 | spin_unlock_bh(&queue->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 517 | EXPORT_SYMBOL_GPL(rpc_wake_up_status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | |
Trond Myklebust | 36df9aa | 2007-07-18 16:18:52 -0400 | [diff] [blame] | 519 | static void __rpc_queue_timer_fn(unsigned long ptr) |
| 520 | { |
| 521 | struct rpc_wait_queue *queue = (struct rpc_wait_queue *)ptr; |
| 522 | struct rpc_task *task, *n; |
| 523 | unsigned long expires, now, timeo; |
| 524 | |
| 525 | spin_lock(&queue->lock); |
| 526 | expires = now = jiffies; |
| 527 | list_for_each_entry_safe(task, n, &queue->timer_list.list, u.tk_wait.timer_list) { |
| 528 | timeo = task->u.tk_wait.expires; |
| 529 | if (time_after_eq(now, timeo)) { |
Trond Myklebust | 36df9aa | 2007-07-18 16:18:52 -0400 | [diff] [blame] | 530 | dprintk("RPC: %5u timeout\n", task->tk_pid); |
| 531 | task->tk_status = -ETIMEDOUT; |
| 532 | rpc_wake_up_task_queue_locked(queue, task); |
| 533 | continue; |
| 534 | } |
| 535 | if (expires == now || time_after(expires, timeo)) |
| 536 | expires = timeo; |
| 537 | } |
| 538 | if (!list_empty(&queue->timer_list.list)) |
| 539 | rpc_set_queue_timer(queue, expires); |
| 540 | spin_unlock(&queue->lock); |
| 541 | } |
| 542 | |
Trond Myklebust | 8014793 | 2006-08-31 18:24:08 -0400 | [diff] [blame] | 543 | static void __rpc_atrun(struct rpc_task *task) |
| 544 | { |
Trond Myklebust | 5d00837 | 2008-02-22 16:34:17 -0500 | [diff] [blame] | 545 | task->tk_status = 0; |
Trond Myklebust | 8014793 | 2006-08-31 18:24:08 -0400 | [diff] [blame] | 546 | } |
| 547 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | /* |
| 549 | * Run a task at a later time |
| 550 | */ |
Trond Myklebust | 8014793 | 2006-08-31 18:24:08 -0400 | [diff] [blame] | 551 | void rpc_delay(struct rpc_task *task, unsigned long delay) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | { |
| 553 | task->tk_timeout = delay; |
Trond Myklebust | 5d00837 | 2008-02-22 16:34:17 -0500 | [diff] [blame] | 554 | rpc_sleep_on(&delay_queue, task, __rpc_atrun); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 556 | EXPORT_SYMBOL_GPL(rpc_delay); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | /* |
Trond Myklebust | 4ce70ad | 2006-01-03 09:55:05 +0100 | [diff] [blame] | 559 | * Helper to call task->tk_ops->rpc_call_prepare |
| 560 | */ |
Andy Adamson | aae2006 | 2009-04-01 09:22:40 -0400 | [diff] [blame] | 561 | void rpc_prepare_task(struct rpc_task *task) |
Trond Myklebust | 4ce70ad | 2006-01-03 09:55:05 +0100 | [diff] [blame] | 562 | { |
| 563 | task->tk_ops->rpc_call_prepare(task, task->tk_calldata); |
| 564 | } |
| 565 | |
| 566 | /* |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 567 | * Helper that calls task->tk_ops->rpc_call_done if it exists |
Trond Myklebust | d05fdb0 | 2005-06-22 17:16:19 +0000 | [diff] [blame] | 568 | */ |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 569 | void rpc_exit_task(struct rpc_task *task) |
Trond Myklebust | d05fdb0 | 2005-06-22 17:16:19 +0000 | [diff] [blame] | 570 | { |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 571 | task->tk_action = NULL; |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 572 | if (task->tk_ops->rpc_call_done != NULL) { |
| 573 | task->tk_ops->rpc_call_done(task, task->tk_calldata); |
Trond Myklebust | d05fdb0 | 2005-06-22 17:16:19 +0000 | [diff] [blame] | 574 | if (task->tk_action != NULL) { |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 575 | WARN_ON(RPC_ASSASSINATED(task)); |
| 576 | /* Always release the RPC slot and buffer memory */ |
| 577 | xprt_release(task); |
Trond Myklebust | d05fdb0 | 2005-06-22 17:16:19 +0000 | [diff] [blame] | 578 | } |
| 579 | } |
Trond Myklebust | d05fdb0 | 2005-06-22 17:16:19 +0000 | [diff] [blame] | 580 | } |
Trond Myklebust | d9b6cd9 | 2010-07-31 14:29:08 -0400 | [diff] [blame] | 581 | |
| 582 | void rpc_exit(struct rpc_task *task, int status) |
| 583 | { |
| 584 | task->tk_status = status; |
| 585 | task->tk_action = rpc_exit_task; |
| 586 | if (RPC_IS_QUEUED(task)) |
| 587 | rpc_wake_up_queued_task(task->tk_waitqueue, task); |
| 588 | } |
| 589 | EXPORT_SYMBOL_GPL(rpc_exit); |
Trond Myklebust | d05fdb0 | 2005-06-22 17:16:19 +0000 | [diff] [blame] | 590 | |
Trond Myklebust | bbd5a1f | 2006-10-18 16:01:05 -0400 | [diff] [blame] | 591 | void rpc_release_calldata(const struct rpc_call_ops *ops, void *calldata) |
| 592 | { |
Trond Myklebust | a86dc49 | 2008-06-11 13:37:09 -0400 | [diff] [blame] | 593 | if (ops->rpc_release != NULL) |
Trond Myklebust | bbd5a1f | 2006-10-18 16:01:05 -0400 | [diff] [blame] | 594 | ops->rpc_release(calldata); |
Trond Myklebust | bbd5a1f | 2006-10-18 16:01:05 -0400 | [diff] [blame] | 595 | } |
| 596 | |
Trond Myklebust | d05fdb0 | 2005-06-22 17:16:19 +0000 | [diff] [blame] | 597 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | * This is the RPC `scheduler' (or rather, the finite state machine). |
| 599 | */ |
Trond Myklebust | 2efef83 | 2007-02-03 13:38:41 -0800 | [diff] [blame] | 600 | static void __rpc_execute(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | { |
Trond Myklebust | eb9b55a | 2009-03-10 20:33:16 -0400 | [diff] [blame] | 602 | struct rpc_wait_queue *queue; |
| 603 | int task_is_async = RPC_IS_ASYNC(task); |
| 604 | int status = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 606 | dprintk("RPC: %5u __rpc_execute flags=0x%x\n", |
| 607 | task->tk_pid, task->tk_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | |
| 609 | BUG_ON(RPC_IS_QUEUED(task)); |
| 610 | |
Trond Myklebust | d05fdb0 | 2005-06-22 17:16:19 +0000 | [diff] [blame] | 611 | for (;;) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | |
| 613 | /* |
| 614 | * Execute any pending callback. |
| 615 | */ |
\\\"J. Bruce Fields\\\ | a486aed | 2008-06-09 16:51:35 -0400 | [diff] [blame] | 616 | if (task->tk_callback) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | void (*save_callback)(struct rpc_task *); |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 618 | |
| 619 | /* |
\\\"J. Bruce Fields\\\ | a486aed | 2008-06-09 16:51:35 -0400 | [diff] [blame] | 620 | * We set tk_callback to NULL before calling it, |
| 621 | * in case it sets the tk_callback field itself: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | */ |
\\\"J. Bruce Fields\\\ | a486aed | 2008-06-09 16:51:35 -0400 | [diff] [blame] | 623 | save_callback = task->tk_callback; |
| 624 | task->tk_callback = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | save_callback(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | } |
| 627 | |
| 628 | /* |
| 629 | * Perform the next FSM step. |
| 630 | * tk_action may be NULL when the task has been killed |
| 631 | * by someone else. |
| 632 | */ |
| 633 | if (!RPC_IS_QUEUED(task)) { |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 634 | if (task->tk_action == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 635 | break; |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 636 | task->tk_action(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | } |
| 638 | |
| 639 | /* |
| 640 | * Lockless check for whether task is sleeping or not. |
| 641 | */ |
| 642 | if (!RPC_IS_QUEUED(task)) |
| 643 | continue; |
Trond Myklebust | eb9b55a | 2009-03-10 20:33:16 -0400 | [diff] [blame] | 644 | /* |
| 645 | * The queue->lock protects against races with |
| 646 | * rpc_make_runnable(). |
| 647 | * |
| 648 | * Note that once we clear RPC_TASK_RUNNING on an asynchronous |
| 649 | * rpc_task, rpc_make_runnable() can assign it to a |
| 650 | * different workqueue. We therefore cannot assume that the |
| 651 | * rpc_task pointer may still be dereferenced. |
| 652 | */ |
| 653 | queue = task->tk_waitqueue; |
| 654 | spin_lock_bh(&queue->lock); |
| 655 | if (!RPC_IS_QUEUED(task)) { |
| 656 | spin_unlock_bh(&queue->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | continue; |
| 658 | } |
Trond Myklebust | eb9b55a | 2009-03-10 20:33:16 -0400 | [diff] [blame] | 659 | rpc_clear_running(task); |
| 660 | spin_unlock_bh(&queue->lock); |
| 661 | if (task_is_async) |
| 662 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | |
| 664 | /* sync task: sleep here */ |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 665 | dprintk("RPC: %5u sync task going to sleep\n", task->tk_pid); |
Trond Myklebust | 96651ab | 2005-06-22 17:16:21 +0000 | [diff] [blame] | 666 | status = out_of_line_wait_on_bit(&task->tk_runstate, |
Matthew Wilcox | 150030b | 2007-12-06 16:24:39 -0500 | [diff] [blame] | 667 | RPC_TASK_QUEUED, rpc_wait_bit_killable, |
| 668 | TASK_KILLABLE); |
Trond Myklebust | 96651ab | 2005-06-22 17:16:21 +0000 | [diff] [blame] | 669 | if (status == -ERESTARTSYS) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | /* |
| 671 | * When a sync task receives a signal, it exits with |
| 672 | * -ERESTARTSYS. In order to catch any callbacks that |
| 673 | * clean up after sleeping on some queue, we don't |
| 674 | * break the loop here, but go around once more. |
| 675 | */ |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 676 | dprintk("RPC: %5u got signal\n", task->tk_pid); |
Trond Myklebust | 96651ab | 2005-06-22 17:16:21 +0000 | [diff] [blame] | 677 | task->tk_flags |= RPC_TASK_KILLED; |
| 678 | rpc_exit(task, -ERESTARTSYS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | } |
| 680 | rpc_set_running(task); |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 681 | dprintk("RPC: %5u sync task resuming\n", task->tk_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | } |
| 683 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 684 | dprintk("RPC: %5u return %d, status %d\n", task->tk_pid, status, |
| 685 | task->tk_status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | /* Release all resources associated with the task */ |
| 687 | rpc_release_task(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | } |
| 689 | |
| 690 | /* |
| 691 | * User-visible entry point to the scheduler. |
| 692 | * |
| 693 | * This may be called recursively if e.g. an async NFS task updates |
| 694 | * the attributes and finds that dirty pages must be flushed. |
| 695 | * NOTE: Upon exit of this function the task is guaranteed to be |
| 696 | * released. In particular note that tk_release() will have |
| 697 | * been called, so your task memory may have been freed. |
| 698 | */ |
Trond Myklebust | 2efef83 | 2007-02-03 13:38:41 -0800 | [diff] [blame] | 699 | void rpc_execute(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | { |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 701 | rpc_set_active(task); |
Trond Myklebust | d6a1ed0 | 2010-07-31 14:29:08 -0400 | [diff] [blame] | 702 | rpc_make_runnable(task); |
| 703 | if (!RPC_IS_ASYNC(task)) |
| 704 | __rpc_execute(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | } |
| 706 | |
David Howells | 65f27f3 | 2006-11-22 14:55:48 +0000 | [diff] [blame] | 707 | static void rpc_async_schedule(struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | { |
David Howells | 65f27f3 | 2006-11-22 14:55:48 +0000 | [diff] [blame] | 709 | __rpc_execute(container_of(work, struct rpc_task, u.tk_work)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | } |
| 711 | |
Chuck Lever | 0210714 | 2006-01-03 09:55:49 +0100 | [diff] [blame] | 712 | /** |
| 713 | * rpc_malloc - allocate an RPC buffer |
| 714 | * @task: RPC task that will use this buffer |
| 715 | * @size: requested byte size |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | * |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 717 | * To prevent rpciod from hanging, this allocator never sleeps, |
| 718 | * returning NULL if the request cannot be serviced immediately. |
| 719 | * The caller can arrange to sleep in a way that is safe for rpciod. |
| 720 | * |
| 721 | * Most requests are 'small' (under 2KiB) and can be serviced from a |
| 722 | * mempool, ensuring that NFS reads and writes can always proceed, |
| 723 | * and that there is good locality of reference for these buffers. |
| 724 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | * In order to avoid memory starvation triggering more writebacks of |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 726 | * NFS requests, we avoid using GFP_KERNEL. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | */ |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 728 | void *rpc_malloc(struct rpc_task *task, size_t size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | { |
Chuck Lever | aa3d1fa | 2007-05-08 18:23:28 -0400 | [diff] [blame] | 730 | struct rpc_buffer *buf; |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 731 | gfp_t gfp = RPC_IS_SWAPPER(task) ? GFP_ATOMIC : GFP_NOWAIT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | |
Chuck Lever | aa3d1fa | 2007-05-08 18:23:28 -0400 | [diff] [blame] | 733 | size += sizeof(struct rpc_buffer); |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 734 | if (size <= RPC_BUFFER_MAXSIZE) |
| 735 | buf = mempool_alloc(rpc_buffer_mempool, gfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | else |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 737 | buf = kmalloc(size, gfp); |
Peter Zijlstra | ddce40d | 2007-05-09 08:30:11 +0200 | [diff] [blame] | 738 | |
| 739 | if (!buf) |
| 740 | return NULL; |
| 741 | |
Chuck Lever | aa3d1fa | 2007-05-08 18:23:28 -0400 | [diff] [blame] | 742 | buf->len = size; |
Geert Uytterhoeven | 215d067 | 2007-05-08 11:37:26 +0200 | [diff] [blame] | 743 | dprintk("RPC: %5u allocated buffer of size %zu at %p\n", |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 744 | task->tk_pid, size, buf); |
Chuck Lever | aa3d1fa | 2007-05-08 18:23:28 -0400 | [diff] [blame] | 745 | return &buf->data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 747 | EXPORT_SYMBOL_GPL(rpc_malloc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | |
Chuck Lever | 0210714 | 2006-01-03 09:55:49 +0100 | [diff] [blame] | 749 | /** |
| 750 | * rpc_free - free buffer allocated via rpc_malloc |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 751 | * @buffer: buffer to free |
Chuck Lever | 0210714 | 2006-01-03 09:55:49 +0100 | [diff] [blame] | 752 | * |
| 753 | */ |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 754 | void rpc_free(void *buffer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 755 | { |
Chuck Lever | aa3d1fa | 2007-05-08 18:23:28 -0400 | [diff] [blame] | 756 | size_t size; |
| 757 | struct rpc_buffer *buf; |
Chuck Lever | 0210714 | 2006-01-03 09:55:49 +0100 | [diff] [blame] | 758 | |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 759 | if (!buffer) |
| 760 | return; |
Chuck Lever | aa3d1fa | 2007-05-08 18:23:28 -0400 | [diff] [blame] | 761 | |
| 762 | buf = container_of(buffer, struct rpc_buffer, data); |
| 763 | size = buf->len; |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 764 | |
Geert Uytterhoeven | 215d067 | 2007-05-08 11:37:26 +0200 | [diff] [blame] | 765 | dprintk("RPC: freeing buffer of size %zu at %p\n", |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 766 | size, buf); |
Chuck Lever | aa3d1fa | 2007-05-08 18:23:28 -0400 | [diff] [blame] | 767 | |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 768 | if (size <= RPC_BUFFER_MAXSIZE) |
| 769 | mempool_free(buf, rpc_buffer_mempool); |
| 770 | else |
| 771 | kfree(buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 772 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 773 | EXPORT_SYMBOL_GPL(rpc_free); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | |
| 775 | /* |
| 776 | * Creation and deletion of RPC task structures |
| 777 | */ |
Trond Myklebust | 47fe064 | 2007-10-25 18:42:55 -0400 | [diff] [blame] | 778 | 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] | 779 | { |
| 780 | memset(task, 0, sizeof(*task)); |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 781 | atomic_set(&task->tk_count, 1); |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 782 | task->tk_flags = task_setup_data->flags; |
| 783 | task->tk_ops = task_setup_data->callback_ops; |
| 784 | task->tk_calldata = task_setup_data->callback_data; |
Trond Myklebust | 6529eba | 2007-06-14 16:40:14 -0400 | [diff] [blame] | 785 | INIT_LIST_HEAD(&task->tk_task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | |
| 787 | /* Initialize retry counters */ |
| 788 | task->tk_garb_retry = 2; |
| 789 | task->tk_cred_retry = 2; |
| 790 | |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 791 | task->tk_priority = task_setup_data->priority - RPC_PRIORITY_LOW; |
| 792 | task->tk_owner = current->tgid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | |
| 794 | /* Initialize workqueue for async tasks */ |
Trond Myklebust | 32bfb5c | 2008-02-19 20:04:21 -0500 | [diff] [blame] | 795 | task->tk_workqueue = task_setup_data->workqueue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 797 | if (task->tk_ops->rpc_call_prepare != NULL) |
| 798 | task->tk_action = rpc_prepare_task; |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 799 | |
Chuck Lever | ef759a2 | 2006-03-20 13:44:17 -0500 | [diff] [blame] | 800 | /* starting timestamp */ |
Chuck Lever | ff83997 | 2010-05-07 13:34:47 -0400 | [diff] [blame] | 801 | task->tk_start = ktime_get(); |
Chuck Lever | ef759a2 | 2006-03-20 13:44:17 -0500 | [diff] [blame] | 802 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 803 | dprintk("RPC: new task initialized, procpid %u\n", |
Pavel Emelyanov | ba25f9d | 2007-10-18 23:40:40 -0700 | [diff] [blame] | 804 | task_pid_nr(current)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 805 | } |
| 806 | |
| 807 | static struct rpc_task * |
| 808 | rpc_alloc_task(void) |
| 809 | { |
| 810 | return (struct rpc_task *)mempool_alloc(rpc_task_mempool, GFP_NOFS); |
| 811 | } |
| 812 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | /* |
Trond Myklebust | 90c5755 | 2007-06-09 19:49:36 -0400 | [diff] [blame] | 814 | * Create a new task for the specified client. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | */ |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 816 | 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] | 817 | { |
Trond Myklebust | e8f5d77 | 2007-10-25 18:42:53 -0400 | [diff] [blame] | 818 | struct rpc_task *task = setup_data->task; |
| 819 | unsigned short flags = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | |
Trond Myklebust | e8f5d77 | 2007-10-25 18:42:53 -0400 | [diff] [blame] | 821 | if (task == NULL) { |
| 822 | task = rpc_alloc_task(); |
Trond Myklebust | 19445b9 | 2010-04-16 16:41:10 -0400 | [diff] [blame] | 823 | if (task == NULL) { |
| 824 | rpc_release_calldata(setup_data->callback_ops, |
| 825 | setup_data->callback_data); |
| 826 | return ERR_PTR(-ENOMEM); |
| 827 | } |
Trond Myklebust | e8f5d77 | 2007-10-25 18:42:53 -0400 | [diff] [blame] | 828 | flags = RPC_TASK_DYNAMIC; |
| 829 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 831 | rpc_init_task(task, setup_data); |
Trond Myklebust | 19445b9 | 2010-04-16 16:41:10 -0400 | [diff] [blame] | 832 | if (task->tk_status < 0) { |
| 833 | int err = task->tk_status; |
| 834 | rpc_put_task(task); |
| 835 | return ERR_PTR(err); |
| 836 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | |
Trond Myklebust | e8f5d77 | 2007-10-25 18:42:53 -0400 | [diff] [blame] | 838 | task->tk_flags |= flags; |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 839 | dprintk("RPC: allocated task %p\n", task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | return task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | } |
| 842 | |
Trond Myklebust | 32bfb5c | 2008-02-19 20:04:21 -0500 | [diff] [blame] | 843 | static void rpc_free_task(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | { |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 845 | const struct rpc_call_ops *tk_ops = task->tk_ops; |
| 846 | void *calldata = task->tk_calldata; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | |
Trond Myklebust | 5e4424a | 2008-02-25 21:53:49 -0800 | [diff] [blame] | 848 | if (task->tk_flags & RPC_TASK_DYNAMIC) { |
| 849 | dprintk("RPC: %5u freeing task\n", task->tk_pid); |
| 850 | mempool_free(task, rpc_task_mempool); |
| 851 | } |
Trond Myklebust | 32bfb5c | 2008-02-19 20:04:21 -0500 | [diff] [blame] | 852 | rpc_release_calldata(tk_ops, calldata); |
| 853 | } |
| 854 | |
| 855 | static void rpc_async_release(struct work_struct *work) |
| 856 | { |
| 857 | rpc_free_task(container_of(work, struct rpc_task, u.tk_work)); |
| 858 | } |
| 859 | |
| 860 | void rpc_put_task(struct rpc_task *task) |
| 861 | { |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 862 | if (!atomic_dec_and_test(&task->tk_count)) |
| 863 | return; |
| 864 | /* Release resources */ |
| 865 | if (task->tk_rqstp) |
| 866 | xprt_release(task); |
| 867 | if (task->tk_msg.rpc_cred) |
Trond Myklebust | a17c215 | 2010-07-31 14:29:08 -0400 | [diff] [blame] | 868 | put_rpccred(task->tk_msg.rpc_cred); |
Trond Myklebust | 58f9612 | 2010-07-31 14:29:08 -0400 | [diff] [blame] | 869 | rpc_task_release_client(task); |
Trond Myklebust | 32bfb5c | 2008-02-19 20:04:21 -0500 | [diff] [blame] | 870 | if (task->tk_workqueue != NULL) { |
| 871 | INIT_WORK(&task->u.tk_work, rpc_async_release); |
| 872 | queue_work(task->tk_workqueue, &task->u.tk_work); |
| 873 | } else |
| 874 | rpc_free_task(task); |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 875 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 876 | EXPORT_SYMBOL_GPL(rpc_put_task); |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 877 | |
Trond Myklebust | bde8f00 | 2007-01-24 11:54:53 -0800 | [diff] [blame] | 878 | static void rpc_release_task(struct rpc_task *task) |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 879 | { |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 880 | dprintk("RPC: %5u release task\n", task->tk_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 881 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | BUG_ON (RPC_IS_QUEUED(task)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 884 | /* Wake up anyone who is waiting for task completion */ |
| 885 | rpc_mark_complete_task(task); |
| 886 | |
| 887 | rpc_put_task(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | } |
| 889 | |
Trond Myklebust | b247bbf | 2007-07-19 16:32:20 -0400 | [diff] [blame] | 890 | int rpciod_up(void) |
| 891 | { |
| 892 | return try_module_get(THIS_MODULE) ? 0 : -EINVAL; |
| 893 | } |
| 894 | |
| 895 | void rpciod_down(void) |
| 896 | { |
| 897 | module_put(THIS_MODULE); |
| 898 | } |
| 899 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | /* |
Trond Myklebust | b247bbf | 2007-07-19 16:32:20 -0400 | [diff] [blame] | 901 | * Start up the rpciod workqueue. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 902 | */ |
Trond Myklebust | b247bbf | 2007-07-19 16:32:20 -0400 | [diff] [blame] | 903 | static int rpciod_start(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 904 | { |
| 905 | struct workqueue_struct *wq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | /* |
| 908 | * Create the rpciod thread and wait for it to start. |
| 909 | */ |
Trond Myklebust | ab418d7 | 2007-06-14 17:08:36 -0400 | [diff] [blame] | 910 | dprintk("RPC: creating workqueue rpciod\n"); |
Trond Myklebust | 4fbf6e5 | 2010-09-21 16:54:34 -0400 | [diff] [blame^] | 911 | wq = alloc_workqueue("rpciod", WQ_RESCUER, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | rpciod_workqueue = wq; |
Trond Myklebust | b247bbf | 2007-07-19 16:32:20 -0400 | [diff] [blame] | 913 | return rpciod_workqueue != NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | } |
| 915 | |
Trond Myklebust | b247bbf | 2007-07-19 16:32:20 -0400 | [diff] [blame] | 916 | static void rpciod_stop(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 917 | { |
Trond Myklebust | b247bbf | 2007-07-19 16:32:20 -0400 | [diff] [blame] | 918 | struct workqueue_struct *wq = NULL; |
Trond Myklebust | ab418d7 | 2007-06-14 17:08:36 -0400 | [diff] [blame] | 919 | |
Trond Myklebust | b247bbf | 2007-07-19 16:32:20 -0400 | [diff] [blame] | 920 | if (rpciod_workqueue == NULL) |
| 921 | return; |
Trond Myklebust | ab418d7 | 2007-06-14 17:08:36 -0400 | [diff] [blame] | 922 | dprintk("RPC: destroying workqueue rpciod\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 923 | |
Trond Myklebust | b247bbf | 2007-07-19 16:32:20 -0400 | [diff] [blame] | 924 | wq = rpciod_workqueue; |
| 925 | rpciod_workqueue = NULL; |
| 926 | destroy_workqueue(wq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | } |
| 928 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 929 | void |
| 930 | rpc_destroy_mempool(void) |
| 931 | { |
Trond Myklebust | b247bbf | 2007-07-19 16:32:20 -0400 | [diff] [blame] | 932 | rpciod_stop(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | if (rpc_buffer_mempool) |
| 934 | mempool_destroy(rpc_buffer_mempool); |
| 935 | if (rpc_task_mempool) |
| 936 | mempool_destroy(rpc_task_mempool); |
Alexey Dobriyan | 1a1d92c | 2006-09-27 01:49:40 -0700 | [diff] [blame] | 937 | if (rpc_task_slabp) |
| 938 | kmem_cache_destroy(rpc_task_slabp); |
| 939 | if (rpc_buffer_slabp) |
| 940 | kmem_cache_destroy(rpc_buffer_slabp); |
Trond Myklebust | f6a1cc8 | 2008-02-22 17:06:55 -0500 | [diff] [blame] | 941 | rpc_destroy_wait_queue(&delay_queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | } |
| 943 | |
| 944 | int |
| 945 | rpc_init_mempool(void) |
| 946 | { |
Trond Myklebust | f6a1cc8 | 2008-02-22 17:06:55 -0500 | [diff] [blame] | 947 | /* |
| 948 | * The following is not strictly a mempool initialisation, |
| 949 | * but there is no harm in doing it here |
| 950 | */ |
| 951 | rpc_init_wait_queue(&delay_queue, "delayq"); |
| 952 | if (!rpciod_start()) |
| 953 | goto err_nomem; |
| 954 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 955 | rpc_task_slabp = kmem_cache_create("rpc_tasks", |
| 956 | sizeof(struct rpc_task), |
| 957 | 0, SLAB_HWCACHE_ALIGN, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 958 | NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | if (!rpc_task_slabp) |
| 960 | goto err_nomem; |
| 961 | rpc_buffer_slabp = kmem_cache_create("rpc_buffers", |
| 962 | RPC_BUFFER_MAXSIZE, |
| 963 | 0, SLAB_HWCACHE_ALIGN, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 964 | NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 965 | if (!rpc_buffer_slabp) |
| 966 | goto err_nomem; |
Matthew Dobson | 93d2341 | 2006-03-26 01:37:50 -0800 | [diff] [blame] | 967 | rpc_task_mempool = mempool_create_slab_pool(RPC_TASK_POOLSIZE, |
| 968 | rpc_task_slabp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 969 | if (!rpc_task_mempool) |
| 970 | goto err_nomem; |
Matthew Dobson | 93d2341 | 2006-03-26 01:37:50 -0800 | [diff] [blame] | 971 | rpc_buffer_mempool = mempool_create_slab_pool(RPC_BUFFER_POOLSIZE, |
| 972 | rpc_buffer_slabp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 973 | if (!rpc_buffer_mempool) |
| 974 | goto err_nomem; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 975 | return 0; |
| 976 | err_nomem: |
| 977 | rpc_destroy_mempool(); |
| 978 | return -ENOMEM; |
| 979 | } |