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 |
| 28 | #define RPC_TASK_MAGIC_ID 0xf00baa |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #endif |
| 30 | |
| 31 | /* |
| 32 | * RPC slabs and memory pools |
| 33 | */ |
| 34 | #define RPC_BUFFER_MAXSIZE (2048) |
| 35 | #define RPC_BUFFER_POOLSIZE (8) |
| 36 | #define RPC_TASK_POOLSIZE (8) |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 37 | static struct kmem_cache *rpc_task_slabp __read_mostly; |
| 38 | static struct kmem_cache *rpc_buffer_slabp __read_mostly; |
Eric Dumazet | ba89966 | 2005-08-26 12:05:31 -0700 | [diff] [blame] | 39 | static mempool_t *rpc_task_mempool __read_mostly; |
| 40 | static mempool_t *rpc_buffer_mempool __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | |
David Howells | 65f27f3 | 2006-11-22 14:55:48 +0000 | [diff] [blame] | 42 | static void rpc_async_schedule(struct work_struct *); |
Trond Myklebust | bde8f00 | 2007-01-24 11:54:53 -0800 | [diff] [blame] | 43 | static void rpc_release_task(struct rpc_task *task); |
Trond Myklebust | 36df9aa | 2007-07-18 16:18:52 -0400 | [diff] [blame] | 44 | static void __rpc_queue_timer_fn(unsigned long ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | |
| 46 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | * RPC tasks sit here while waiting for conditions to improve. |
| 48 | */ |
Trond Myklebust | a4a8749 | 2007-07-18 13:24:19 -0400 | [diff] [blame] | 49 | static struct rpc_wait_queue delay_queue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | |
| 51 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | * rpciod-related stuff |
| 53 | */ |
Trond Myklebust | 24c5d9d | 2006-03-20 13:44:08 -0500 | [diff] [blame] | 54 | struct workqueue_struct *rpciod_workqueue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | |
| 56 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | * Disable the timer for a given RPC task. Should be called with |
| 58 | * queue->lock and bh_disabled in order to avoid races within |
| 59 | * rpc_run_timer(). |
| 60 | */ |
Trond Myklebust | 5d00837 | 2008-02-22 16:34:17 -0500 | [diff] [blame] | 61 | static void |
Trond Myklebust | eb276c0 | 2008-02-22 17:27:59 -0500 | [diff] [blame] | 62 | __rpc_disable_timer(struct rpc_wait_queue *queue, struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | { |
Trond Myklebust | 36df9aa | 2007-07-18 16:18:52 -0400 | [diff] [blame] | 64 | if (task->tk_timeout == 0) |
| 65 | return; |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 66 | dprintk("RPC: %5u disabling timer\n", task->tk_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | task->tk_timeout = 0; |
Trond Myklebust | 36df9aa | 2007-07-18 16:18:52 -0400 | [diff] [blame] | 68 | list_del(&task->u.tk_wait.timer_list); |
Trond Myklebust | eb276c0 | 2008-02-22 17:27:59 -0500 | [diff] [blame] | 69 | if (list_empty(&queue->timer_list.list)) |
| 70 | del_timer(&queue->timer_list.timer); |
Trond Myklebust | 36df9aa | 2007-07-18 16:18:52 -0400 | [diff] [blame] | 71 | } |
| 72 | |
| 73 | static void |
| 74 | rpc_set_queue_timer(struct rpc_wait_queue *queue, unsigned long expires) |
| 75 | { |
| 76 | queue->timer_list.expires = expires; |
| 77 | mod_timer(&queue->timer_list.timer, expires); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | } |
| 79 | |
| 80 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | * Set up a timer for the current task. |
| 82 | */ |
Trond Myklebust | 5d00837 | 2008-02-22 16:34:17 -0500 | [diff] [blame] | 83 | static void |
Trond Myklebust | eb276c0 | 2008-02-22 17:27:59 -0500 | [diff] [blame] | 84 | __rpc_add_timer(struct rpc_wait_queue *queue, struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | { |
| 86 | if (!task->tk_timeout) |
| 87 | return; |
| 88 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 89 | dprintk("RPC: %5u setting alarm for %lu ms\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | task->tk_pid, task->tk_timeout * 1000 / HZ); |
| 91 | |
Trond Myklebust | eb276c0 | 2008-02-22 17:27:59 -0500 | [diff] [blame] | 92 | task->u.tk_wait.expires = jiffies + task->tk_timeout; |
| 93 | if (list_empty(&queue->timer_list.list) || time_before(task->u.tk_wait.expires, queue->timer_list.expires)) |
| 94 | rpc_set_queue_timer(queue, task->u.tk_wait.expires); |
| 95 | list_add(&task->u.tk_wait.timer_list, &queue->timer_list.list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | } |
| 97 | |
| 98 | /* |
| 99 | * Add new request to a priority queue. |
| 100 | */ |
| 101 | static void __rpc_add_wait_queue_priority(struct rpc_wait_queue *queue, struct rpc_task *task) |
| 102 | { |
| 103 | struct list_head *q; |
| 104 | struct rpc_task *t; |
| 105 | |
| 106 | INIT_LIST_HEAD(&task->u.tk_wait.links); |
| 107 | q = &queue->tasks[task->tk_priority]; |
| 108 | if (unlikely(task->tk_priority > queue->maxpriority)) |
| 109 | q = &queue->tasks[queue->maxpriority]; |
| 110 | list_for_each_entry(t, q, u.tk_wait.list) { |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 111 | if (t->tk_owner == task->tk_owner) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | list_add_tail(&task->u.tk_wait.list, &t->u.tk_wait.links); |
| 113 | return; |
| 114 | } |
| 115 | } |
| 116 | list_add_tail(&task->u.tk_wait.list, q); |
| 117 | } |
| 118 | |
| 119 | /* |
| 120 | * Add new request to wait queue. |
| 121 | * |
| 122 | * Swapper tasks always get inserted at the head of the queue. |
| 123 | * This should avoid many nasty memory deadlocks and hopefully |
| 124 | * improve overall performance. |
| 125 | * Everyone else gets appended to the queue to ensure proper FIFO behavior. |
| 126 | */ |
| 127 | static void __rpc_add_wait_queue(struct rpc_wait_queue *queue, struct rpc_task *task) |
| 128 | { |
| 129 | BUG_ON (RPC_IS_QUEUED(task)); |
| 130 | |
| 131 | if (RPC_IS_PRIORITY(queue)) |
| 132 | __rpc_add_wait_queue_priority(queue, task); |
| 133 | else if (RPC_IS_SWAPPER(task)) |
| 134 | list_add(&task->u.tk_wait.list, &queue->tasks[0]); |
| 135 | else |
| 136 | list_add_tail(&task->u.tk_wait.list, &queue->tasks[0]); |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 137 | task->tk_waitqueue = queue; |
Chuck Lever | e19b63d | 2006-03-20 13:44:15 -0500 | [diff] [blame] | 138 | queue->qlen++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | rpc_set_queued(task); |
| 140 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 141 | dprintk("RPC: %5u added to queue %p \"%s\"\n", |
| 142 | task->tk_pid, queue, rpc_qname(queue)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | } |
| 144 | |
| 145 | /* |
| 146 | * Remove request from a priority queue. |
| 147 | */ |
| 148 | static void __rpc_remove_wait_queue_priority(struct rpc_task *task) |
| 149 | { |
| 150 | struct rpc_task *t; |
| 151 | |
| 152 | if (!list_empty(&task->u.tk_wait.links)) { |
| 153 | t = list_entry(task->u.tk_wait.links.next, struct rpc_task, u.tk_wait.list); |
| 154 | list_move(&t->u.tk_wait.list, &task->u.tk_wait.list); |
| 155 | list_splice_init(&task->u.tk_wait.links, &t->u.tk_wait.links); |
| 156 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | { |
Trond Myklebust | eb276c0 | 2008-02-22 17:27:59 -0500 | [diff] [blame] | 165 | __rpc_disable_timer(queue, task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | if (RPC_IS_PRIORITY(queue)) |
| 167 | __rpc_remove_wait_queue_priority(task); |
Trond Myklebust | 36df9aa | 2007-07-18 16:18:52 -0400 | [diff] [blame] | 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); |
Trond Myklebust | 36df9aa | 2007-07-18 16:18:52 -0400 | [diff] [blame] | 201 | queue->qlen = 0; |
| 202 | setup_timer(&queue->timer_list.timer, __rpc_queue_timer_fn, (unsigned long)queue); |
| 203 | INIT_LIST_HEAD(&queue->timer_list.list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | #ifdef RPC_DEBUG |
| 205 | queue->name = qname; |
| 206 | #endif |
| 207 | } |
| 208 | |
| 209 | void rpc_init_priority_wait_queue(struct rpc_wait_queue *queue, const char *qname) |
| 210 | { |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 211 | __rpc_init_priority_wait_queue(queue, qname, RPC_NR_PRIORITY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | } |
| 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 | |
| 239 | task->tk_magic = RPC_TASK_MAGIC_ID; |
| 240 | task->tk_pid = atomic_inc_return(&rpc_pid); |
| 241 | } |
| 242 | #else |
| 243 | static inline void rpc_task_set_debuginfo(struct rpc_task *task) |
| 244 | { |
| 245 | } |
| 246 | #endif |
| 247 | |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 248 | static void rpc_set_active(struct rpc_task *task) |
| 249 | { |
Trond Myklebust | 4bef61f | 2007-06-16 14:17:01 -0400 | [diff] [blame] | 250 | struct rpc_clnt *clnt; |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 251 | if (test_and_set_bit(RPC_TASK_ACTIVE, &task->tk_runstate) != 0) |
| 252 | return; |
Trond Myklebust | c44fe70 | 2007-06-16 14:17:01 -0400 | [diff] [blame] | 253 | rpc_task_set_debuginfo(task); |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 254 | /* Add to global list of all tasks */ |
Trond Myklebust | 4bef61f | 2007-06-16 14:17:01 -0400 | [diff] [blame] | 255 | clnt = task->tk_client; |
| 256 | if (clnt != NULL) { |
| 257 | spin_lock(&clnt->cl_lock); |
| 258 | list_add_tail(&task->tk_task, &clnt->cl_tasks); |
| 259 | spin_unlock(&clnt->cl_lock); |
| 260 | } |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 261 | } |
| 262 | |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 263 | /* |
| 264 | * Mark an RPC call as having completed by clearing the 'active' bit |
| 265 | */ |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 266 | static void rpc_mark_complete_task(struct rpc_task *task) |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 267 | { |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 268 | smp_mb__before_clear_bit(); |
| 269 | clear_bit(RPC_TASK_ACTIVE, &task->tk_runstate); |
| 270 | smp_mb__after_clear_bit(); |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 271 | wake_up_bit(&task->tk_runstate, RPC_TASK_ACTIVE); |
| 272 | } |
| 273 | |
| 274 | /* |
| 275 | * Allow callers to wait for completion of an RPC call |
| 276 | */ |
| 277 | int __rpc_wait_for_completion_task(struct rpc_task *task, int (*action)(void *)) |
| 278 | { |
| 279 | if (action == NULL) |
Matthew Wilcox | 150030b | 2007-12-06 16:24:39 -0500 | [diff] [blame] | 280 | action = rpc_wait_bit_killable; |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 281 | return wait_on_bit(&task->tk_runstate, RPC_TASK_ACTIVE, |
Matthew Wilcox | 150030b | 2007-12-06 16:24:39 -0500 | [diff] [blame] | 282 | action, TASK_KILLABLE); |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 283 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 284 | EXPORT_SYMBOL_GPL(__rpc_wait_for_completion_task); |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 285 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | /* |
| 287 | * Make an RPC task runnable. |
| 288 | * |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 289 | * Note: If the task is ASYNC, this must be called with |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | * the spinlock held to protect the wait queue operation. |
| 291 | */ |
| 292 | static void rpc_make_runnable(struct rpc_task *task) |
| 293 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | rpc_clear_queued(task); |
Christophe Saout | cc4dc59e | 2006-11-05 18:42:48 +0100 | [diff] [blame] | 295 | if (rpc_test_and_set_running(task)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | return; |
| 297 | if (RPC_IS_ASYNC(task)) { |
| 298 | int status; |
| 299 | |
David Howells | 65f27f3 | 2006-11-22 14:55:48 +0000 | [diff] [blame] | 300 | INIT_WORK(&task->u.tk_work, rpc_async_schedule); |
Trond Myklebust | 32bfb5c | 2008-02-19 20:04:21 -0500 | [diff] [blame] | 301 | status = queue_work(rpciod_workqueue, &task->u.tk_work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | if (status < 0) { |
| 303 | printk(KERN_WARNING "RPC: failed to add task to queue: error: %d!\n", status); |
| 304 | task->tk_status = status; |
| 305 | return; |
| 306 | } |
| 307 | } else |
Trond Myklebust | 96651ab | 2005-06-22 17:16:21 +0000 | [diff] [blame] | 308 | wake_up_bit(&task->tk_runstate, RPC_TASK_QUEUED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | } |
| 310 | |
| 311 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | * Prepare for sleeping on a wait queue. |
| 313 | * By always appending tasks to the list we ensure FIFO behavior. |
| 314 | * NB: An RPC task will only receive interrupt-driven events as long |
| 315 | * as it's on a wait queue. |
| 316 | */ |
| 317 | 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] | 318 | rpc_action action) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | { |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 320 | dprintk("RPC: %5u sleep_on(queue \"%s\" time %lu)\n", |
| 321 | task->tk_pid, rpc_qname(q), jiffies); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | |
| 323 | if (!RPC_IS_ASYNC(task) && !RPC_IS_ACTIVATED(task)) { |
| 324 | printk(KERN_ERR "RPC: Inactive synchronous task put to sleep!\n"); |
| 325 | return; |
| 326 | } |
| 327 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | __rpc_add_wait_queue(q, task); |
| 329 | |
| 330 | BUG_ON(task->tk_callback != NULL); |
| 331 | task->tk_callback = action; |
Trond Myklebust | eb276c0 | 2008-02-22 17:27:59 -0500 | [diff] [blame] | 332 | __rpc_add_timer(q, task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | } |
| 334 | |
| 335 | 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] | 336 | rpc_action action) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | { |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 338 | /* Mark the task as being activated if so needed */ |
| 339 | rpc_set_active(task); |
| 340 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | /* |
| 342 | * Protect the queue operations. |
| 343 | */ |
| 344 | spin_lock_bh(&q->lock); |
Trond Myklebust | 5d00837 | 2008-02-22 16:34:17 -0500 | [diff] [blame] | 345 | __rpc_sleep_on(q, task, action); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | spin_unlock_bh(&q->lock); |
| 347 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 348 | EXPORT_SYMBOL_GPL(rpc_sleep_on); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | |
| 350 | /** |
| 351 | * __rpc_do_wake_up_task - wake up a single rpc_task |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 352 | * @queue: wait queue |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | * @task: task to be woken up |
| 354 | * |
| 355 | * Caller must hold queue->lock, and have cleared the task queued flag. |
| 356 | */ |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 357 | 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] | 358 | { |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 359 | dprintk("RPC: %5u __rpc_wake_up_task (now %lu)\n", |
| 360 | task->tk_pid, jiffies); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | |
| 362 | #ifdef RPC_DEBUG |
| 363 | BUG_ON(task->tk_magic != RPC_TASK_MAGIC_ID); |
| 364 | #endif |
| 365 | /* Has the task been executed yet? If not, we cannot wake it up! */ |
| 366 | if (!RPC_IS_ACTIVATED(task)) { |
| 367 | printk(KERN_ERR "RPC: Inactive task (%p) being woken up!\n", task); |
| 368 | return; |
| 369 | } |
| 370 | |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 371 | __rpc_remove_wait_queue(queue, task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | |
| 373 | rpc_make_runnable(task); |
| 374 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 375 | dprintk("RPC: __rpc_wake_up_task done\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | } |
| 377 | |
| 378 | /* |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 379 | * Wake up a queued task while the queue lock is being held |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | */ |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 381 | 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] | 382 | { |
Trond Myklebust | f5fb7b06 | 2008-02-25 21:40:50 -0800 | [diff] [blame] | 383 | if (RPC_IS_QUEUED(task) && task->tk_waitqueue == queue) |
| 384 | __rpc_do_wake_up_task(queue, task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | } |
| 386 | |
| 387 | /* |
Alexandros Batsakis | 48f1861 | 2009-12-14 21:27:53 -0800 | [diff] [blame^] | 388 | * Tests whether rpc queue is empty |
| 389 | */ |
| 390 | int rpc_queue_empty(struct rpc_wait_queue *queue) |
| 391 | { |
| 392 | int res; |
| 393 | |
| 394 | spin_lock_bh(&queue->lock); |
| 395 | res = queue->qlen; |
| 396 | spin_unlock_bh(&queue->lock); |
| 397 | return (res == 0); |
| 398 | } |
| 399 | EXPORT_SYMBOL_GPL(rpc_queue_empty); |
| 400 | |
| 401 | /* |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 402 | * Wake up a task on a specific queue |
| 403 | */ |
| 404 | void rpc_wake_up_queued_task(struct rpc_wait_queue *queue, struct rpc_task *task) |
| 405 | { |
Trond Myklebust | 5e4424a | 2008-02-25 21:53:49 -0800 | [diff] [blame] | 406 | spin_lock_bh(&queue->lock); |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 407 | rpc_wake_up_task_queue_locked(queue, task); |
Trond Myklebust | 5e4424a | 2008-02-25 21:53:49 -0800 | [diff] [blame] | 408 | spin_unlock_bh(&queue->lock); |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 409 | } |
| 410 | EXPORT_SYMBOL_GPL(rpc_wake_up_queued_task); |
| 411 | |
| 412 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | * Wake up the specified task |
| 414 | */ |
Trond Myklebust | fda1393 | 2008-02-22 16:34:12 -0500 | [diff] [blame] | 415 | static void rpc_wake_up_task(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | { |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 417 | rpc_wake_up_queued_task(task->tk_waitqueue, task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | } |
| 419 | |
| 420 | /* |
| 421 | * Wake up the next task on a priority queue. |
| 422 | */ |
| 423 | static struct rpc_task * __rpc_wake_up_next_priority(struct rpc_wait_queue *queue) |
| 424 | { |
| 425 | struct list_head *q; |
| 426 | struct rpc_task *task; |
| 427 | |
| 428 | /* |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 429 | * Service a batch of tasks from a single owner. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | */ |
| 431 | q = &queue->tasks[queue->priority]; |
| 432 | if (!list_empty(q)) { |
| 433 | task = list_entry(q->next, struct rpc_task, u.tk_wait.list); |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 434 | if (queue->owner == task->tk_owner) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | if (--queue->nr) |
| 436 | goto out; |
| 437 | list_move_tail(&task->u.tk_wait.list, q); |
| 438 | } |
| 439 | /* |
| 440 | * Check if we need to switch queues. |
| 441 | */ |
| 442 | if (--queue->count) |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 443 | goto new_owner; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | } |
| 445 | |
| 446 | /* |
| 447 | * Service the next queue. |
| 448 | */ |
| 449 | do { |
| 450 | if (q == &queue->tasks[0]) |
| 451 | q = &queue->tasks[queue->maxpriority]; |
| 452 | else |
| 453 | q = q - 1; |
| 454 | if (!list_empty(q)) { |
| 455 | task = list_entry(q->next, struct rpc_task, u.tk_wait.list); |
| 456 | goto new_queue; |
| 457 | } |
| 458 | } while (q != &queue->tasks[queue->priority]); |
| 459 | |
| 460 | rpc_reset_waitqueue_priority(queue); |
| 461 | return NULL; |
| 462 | |
| 463 | new_queue: |
| 464 | rpc_set_waitqueue_priority(queue, (unsigned int)(q - &queue->tasks[0])); |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 465 | new_owner: |
| 466 | rpc_set_waitqueue_owner(queue, task->tk_owner); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | out: |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 468 | rpc_wake_up_task_queue_locked(queue, task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | return task; |
| 470 | } |
| 471 | |
| 472 | /* |
| 473 | * Wake up the next task on the wait queue. |
| 474 | */ |
| 475 | struct rpc_task * rpc_wake_up_next(struct rpc_wait_queue *queue) |
| 476 | { |
| 477 | struct rpc_task *task = NULL; |
| 478 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 479 | dprintk("RPC: wake_up_next(%p \"%s\")\n", |
| 480 | queue, rpc_qname(queue)); |
Trond Myklebust | 5e4424a | 2008-02-25 21:53:49 -0800 | [diff] [blame] | 481 | spin_lock_bh(&queue->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | if (RPC_IS_PRIORITY(queue)) |
| 483 | task = __rpc_wake_up_next_priority(queue); |
| 484 | else { |
| 485 | task_for_first(task, &queue->tasks[0]) |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 486 | rpc_wake_up_task_queue_locked(queue, task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
| 490 | return task; |
| 491 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 492 | EXPORT_SYMBOL_GPL(rpc_wake_up_next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | |
| 494 | /** |
| 495 | * rpc_wake_up - wake up all rpc_tasks |
| 496 | * @queue: rpc_wait_queue on which the tasks are sleeping |
| 497 | * |
| 498 | * Grabs queue->lock |
| 499 | */ |
| 500 | void rpc_wake_up(struct rpc_wait_queue *queue) |
| 501 | { |
Trond Myklebust | e6d83d5 | 2006-03-13 21:20:48 -0800 | [diff] [blame] | 502 | struct rpc_task *task, *next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | struct list_head *head; |
Trond Myklebust | e6d83d5 | 2006-03-13 21:20:48 -0800 | [diff] [blame] | 504 | |
Trond Myklebust | 5e4424a | 2008-02-25 21:53:49 -0800 | [diff] [blame] | 505 | spin_lock_bh(&queue->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | head = &queue->tasks[queue->maxpriority]; |
| 507 | for (;;) { |
Trond Myklebust | e6d83d5 | 2006-03-13 21:20:48 -0800 | [diff] [blame] | 508 | list_for_each_entry_safe(task, next, head, u.tk_wait.list) |
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 | if (head == &queue->tasks[0]) |
| 511 | break; |
| 512 | head--; |
| 513 | } |
Trond Myklebust | 5e4424a | 2008-02-25 21:53:49 -0800 | [diff] [blame] | 514 | spin_unlock_bh(&queue->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 516 | EXPORT_SYMBOL_GPL(rpc_wake_up); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | |
| 518 | /** |
| 519 | * rpc_wake_up_status - wake up all rpc_tasks and set their status value. |
| 520 | * @queue: rpc_wait_queue on which the tasks are sleeping |
| 521 | * @status: status value to set |
| 522 | * |
| 523 | * Grabs queue->lock |
| 524 | */ |
| 525 | void rpc_wake_up_status(struct rpc_wait_queue *queue, int status) |
| 526 | { |
Trond Myklebust | e6d83d5 | 2006-03-13 21:20:48 -0800 | [diff] [blame] | 527 | struct rpc_task *task, *next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | struct list_head *head; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | |
Trond Myklebust | 5e4424a | 2008-02-25 21:53:49 -0800 | [diff] [blame] | 530 | spin_lock_bh(&queue->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | head = &queue->tasks[queue->maxpriority]; |
| 532 | for (;;) { |
Trond Myklebust | e6d83d5 | 2006-03-13 21:20:48 -0800 | [diff] [blame] | 533 | list_for_each_entry_safe(task, next, head, u.tk_wait.list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | task->tk_status = status; |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 535 | rpc_wake_up_task_queue_locked(queue, task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | } |
| 537 | if (head == &queue->tasks[0]) |
| 538 | break; |
| 539 | head--; |
| 540 | } |
Trond Myklebust | 5e4424a | 2008-02-25 21:53:49 -0800 | [diff] [blame] | 541 | spin_unlock_bh(&queue->lock); |
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 | 36df9aa | 2007-07-18 16:18:52 -0400 | [diff] [blame] | 545 | static void __rpc_queue_timer_fn(unsigned long ptr) |
| 546 | { |
| 547 | struct rpc_wait_queue *queue = (struct rpc_wait_queue *)ptr; |
| 548 | struct rpc_task *task, *n; |
| 549 | unsigned long expires, now, timeo; |
| 550 | |
| 551 | spin_lock(&queue->lock); |
| 552 | expires = now = jiffies; |
| 553 | list_for_each_entry_safe(task, n, &queue->timer_list.list, u.tk_wait.timer_list) { |
| 554 | timeo = task->u.tk_wait.expires; |
| 555 | if (time_after_eq(now, timeo)) { |
Trond Myklebust | 36df9aa | 2007-07-18 16:18:52 -0400 | [diff] [blame] | 556 | dprintk("RPC: %5u timeout\n", task->tk_pid); |
| 557 | task->tk_status = -ETIMEDOUT; |
| 558 | rpc_wake_up_task_queue_locked(queue, task); |
| 559 | continue; |
| 560 | } |
| 561 | if (expires == now || time_after(expires, timeo)) |
| 562 | expires = timeo; |
| 563 | } |
| 564 | if (!list_empty(&queue->timer_list.list)) |
| 565 | rpc_set_queue_timer(queue, expires); |
| 566 | spin_unlock(&queue->lock); |
| 567 | } |
| 568 | |
Trond Myklebust | 8014793 | 2006-08-31 18:24:08 -0400 | [diff] [blame] | 569 | static void __rpc_atrun(struct rpc_task *task) |
| 570 | { |
Trond Myklebust | 5d00837 | 2008-02-22 16:34:17 -0500 | [diff] [blame] | 571 | task->tk_status = 0; |
Trond Myklebust | 8014793 | 2006-08-31 18:24:08 -0400 | [diff] [blame] | 572 | } |
| 573 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | /* |
| 575 | * Run a task at a later time |
| 576 | */ |
Trond Myklebust | 8014793 | 2006-08-31 18:24:08 -0400 | [diff] [blame] | 577 | void rpc_delay(struct rpc_task *task, unsigned long delay) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | { |
| 579 | task->tk_timeout = delay; |
Trond Myklebust | 5d00837 | 2008-02-22 16:34:17 -0500 | [diff] [blame] | 580 | rpc_sleep_on(&delay_queue, task, __rpc_atrun); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 582 | EXPORT_SYMBOL_GPL(rpc_delay); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | /* |
Trond Myklebust | 4ce70ad | 2006-01-03 09:55:05 +0100 | [diff] [blame] | 585 | * Helper to call task->tk_ops->rpc_call_prepare |
| 586 | */ |
Andy Adamson | aae2006 | 2009-04-01 09:22:40 -0400 | [diff] [blame] | 587 | void rpc_prepare_task(struct rpc_task *task) |
Trond Myklebust | 4ce70ad | 2006-01-03 09:55:05 +0100 | [diff] [blame] | 588 | { |
| 589 | task->tk_ops->rpc_call_prepare(task, task->tk_calldata); |
| 590 | } |
| 591 | |
| 592 | /* |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 593 | * Helper that calls task->tk_ops->rpc_call_done if it exists |
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 | void rpc_exit_task(struct rpc_task *task) |
Trond Myklebust | d05fdb0 | 2005-06-22 17:16:19 +0000 | [diff] [blame] | 596 | { |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 597 | task->tk_action = NULL; |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 598 | if (task->tk_ops->rpc_call_done != NULL) { |
| 599 | task->tk_ops->rpc_call_done(task, task->tk_calldata); |
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 | { |
Trond Myklebust | a86dc49 | 2008-06-11 13:37:09 -0400 | [diff] [blame] | 611 | if (ops->rpc_release != NULL) |
Trond Myklebust | bbd5a1f | 2006-10-18 16:01:05 -0400 | [diff] [blame] | 612 | ops->rpc_release(calldata); |
Trond Myklebust | bbd5a1f | 2006-10-18 16:01:05 -0400 | [diff] [blame] | 613 | } |
| 614 | |
Trond Myklebust | d05fdb0 | 2005-06-22 17:16:19 +0000 | [diff] [blame] | 615 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | * This is the RPC `scheduler' (or rather, the finite state machine). |
| 617 | */ |
Trond Myklebust | 2efef83 | 2007-02-03 13:38:41 -0800 | [diff] [blame] | 618 | static void __rpc_execute(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | { |
Trond Myklebust | eb9b55a | 2009-03-10 20:33:16 -0400 | [diff] [blame] | 620 | struct rpc_wait_queue *queue; |
| 621 | int task_is_async = RPC_IS_ASYNC(task); |
| 622 | int status = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 624 | dprintk("RPC: %5u __rpc_execute flags=0x%x\n", |
| 625 | task->tk_pid, task->tk_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | |
| 627 | BUG_ON(RPC_IS_QUEUED(task)); |
| 628 | |
Trond Myklebust | d05fdb0 | 2005-06-22 17:16:19 +0000 | [diff] [blame] | 629 | for (;;) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | |
| 631 | /* |
| 632 | * Execute any pending callback. |
| 633 | */ |
\\\"J. Bruce Fields\\\ | a486aed | 2008-06-09 16:51:35 -0400 | [diff] [blame] | 634 | if (task->tk_callback) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 635 | void (*save_callback)(struct rpc_task *); |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 636 | |
| 637 | /* |
\\\"J. Bruce Fields\\\ | a486aed | 2008-06-09 16:51:35 -0400 | [diff] [blame] | 638 | * We set tk_callback to NULL before calling it, |
| 639 | * in case it sets the tk_callback field itself: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | */ |
\\\"J. Bruce Fields\\\ | a486aed | 2008-06-09 16:51:35 -0400 | [diff] [blame] | 641 | save_callback = task->tk_callback; |
| 642 | task->tk_callback = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | save_callback(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | } |
| 645 | |
| 646 | /* |
| 647 | * Perform the next FSM step. |
| 648 | * tk_action may be NULL when the task has been killed |
| 649 | * by someone else. |
| 650 | */ |
| 651 | if (!RPC_IS_QUEUED(task)) { |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 652 | if (task->tk_action == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | break; |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 654 | task->tk_action(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | } |
| 656 | |
| 657 | /* |
| 658 | * Lockless check for whether task is sleeping or not. |
| 659 | */ |
| 660 | if (!RPC_IS_QUEUED(task)) |
| 661 | continue; |
Trond Myklebust | eb9b55a | 2009-03-10 20:33:16 -0400 | [diff] [blame] | 662 | /* |
| 663 | * The queue->lock protects against races with |
| 664 | * rpc_make_runnable(). |
| 665 | * |
| 666 | * Note that once we clear RPC_TASK_RUNNING on an asynchronous |
| 667 | * rpc_task, rpc_make_runnable() can assign it to a |
| 668 | * different workqueue. We therefore cannot assume that the |
| 669 | * rpc_task pointer may still be dereferenced. |
| 670 | */ |
| 671 | queue = task->tk_waitqueue; |
| 672 | spin_lock_bh(&queue->lock); |
| 673 | if (!RPC_IS_QUEUED(task)) { |
| 674 | spin_unlock_bh(&queue->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | continue; |
| 676 | } |
Trond Myklebust | eb9b55a | 2009-03-10 20:33:16 -0400 | [diff] [blame] | 677 | rpc_clear_running(task); |
| 678 | spin_unlock_bh(&queue->lock); |
| 679 | if (task_is_async) |
| 680 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | |
| 682 | /* sync task: sleep here */ |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 683 | dprintk("RPC: %5u sync task going to sleep\n", task->tk_pid); |
Trond Myklebust | 96651ab | 2005-06-22 17:16:21 +0000 | [diff] [blame] | 684 | status = out_of_line_wait_on_bit(&task->tk_runstate, |
Matthew Wilcox | 150030b | 2007-12-06 16:24:39 -0500 | [diff] [blame] | 685 | RPC_TASK_QUEUED, rpc_wait_bit_killable, |
| 686 | TASK_KILLABLE); |
Trond Myklebust | 96651ab | 2005-06-22 17:16:21 +0000 | [diff] [blame] | 687 | if (status == -ERESTARTSYS) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | /* |
| 689 | * When a sync task receives a signal, it exits with |
| 690 | * -ERESTARTSYS. In order to catch any callbacks that |
| 691 | * clean up after sleeping on some queue, we don't |
| 692 | * break the loop here, but go around once more. |
| 693 | */ |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 694 | dprintk("RPC: %5u got signal\n", task->tk_pid); |
Trond Myklebust | 96651ab | 2005-06-22 17:16:21 +0000 | [diff] [blame] | 695 | task->tk_flags |= RPC_TASK_KILLED; |
| 696 | rpc_exit(task, -ERESTARTSYS); |
| 697 | rpc_wake_up_task(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | } |
| 699 | rpc_set_running(task); |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 700 | dprintk("RPC: %5u sync task resuming\n", task->tk_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | } |
| 702 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 703 | dprintk("RPC: %5u return %d, status %d\n", task->tk_pid, status, |
| 704 | task->tk_status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | /* Release all resources associated with the task */ |
| 706 | rpc_release_task(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | } |
| 708 | |
| 709 | /* |
| 710 | * User-visible entry point to the scheduler. |
| 711 | * |
| 712 | * This may be called recursively if e.g. an async NFS task updates |
| 713 | * the attributes and finds that dirty pages must be flushed. |
| 714 | * NOTE: Upon exit of this function the task is guaranteed to be |
| 715 | * released. In particular note that tk_release() will have |
| 716 | * been called, so your task memory may have been freed. |
| 717 | */ |
Trond Myklebust | 2efef83 | 2007-02-03 13:38:41 -0800 | [diff] [blame] | 718 | void rpc_execute(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | { |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 720 | rpc_set_active(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | rpc_set_running(task); |
Trond Myklebust | 2efef83 | 2007-02-03 13:38:41 -0800 | [diff] [blame] | 722 | __rpc_execute(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | } |
| 724 | |
David Howells | 65f27f3 | 2006-11-22 14:55:48 +0000 | [diff] [blame] | 725 | static void rpc_async_schedule(struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | { |
David Howells | 65f27f3 | 2006-11-22 14:55:48 +0000 | [diff] [blame] | 727 | __rpc_execute(container_of(work, struct rpc_task, u.tk_work)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | } |
| 729 | |
Chuck Lever | 0210714 | 2006-01-03 09:55:49 +0100 | [diff] [blame] | 730 | /** |
| 731 | * rpc_malloc - allocate an RPC buffer |
| 732 | * @task: RPC task that will use this buffer |
| 733 | * @size: requested byte size |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | * |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 735 | * To prevent rpciod from hanging, this allocator never sleeps, |
| 736 | * returning NULL if the request cannot be serviced immediately. |
| 737 | * The caller can arrange to sleep in a way that is safe for rpciod. |
| 738 | * |
| 739 | * Most requests are 'small' (under 2KiB) and can be serviced from a |
| 740 | * mempool, ensuring that NFS reads and writes can always proceed, |
| 741 | * and that there is good locality of reference for these buffers. |
| 742 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | * In order to avoid memory starvation triggering more writebacks of |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 744 | * NFS requests, we avoid using GFP_KERNEL. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | */ |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 746 | void *rpc_malloc(struct rpc_task *task, size_t size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | { |
Chuck Lever | aa3d1fa | 2007-05-08 18:23:28 -0400 | [diff] [blame] | 748 | struct rpc_buffer *buf; |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 749 | gfp_t gfp = RPC_IS_SWAPPER(task) ? GFP_ATOMIC : GFP_NOWAIT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | |
Chuck Lever | aa3d1fa | 2007-05-08 18:23:28 -0400 | [diff] [blame] | 751 | size += sizeof(struct rpc_buffer); |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 752 | if (size <= RPC_BUFFER_MAXSIZE) |
| 753 | buf = mempool_alloc(rpc_buffer_mempool, gfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | else |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 755 | buf = kmalloc(size, gfp); |
Peter Zijlstra | ddce40d | 2007-05-09 08:30:11 +0200 | [diff] [blame] | 756 | |
| 757 | if (!buf) |
| 758 | return NULL; |
| 759 | |
Chuck Lever | aa3d1fa | 2007-05-08 18:23:28 -0400 | [diff] [blame] | 760 | buf->len = size; |
Geert Uytterhoeven | 215d067 | 2007-05-08 11:37:26 +0200 | [diff] [blame] | 761 | dprintk("RPC: %5u allocated buffer of size %zu at %p\n", |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 762 | task->tk_pid, size, buf); |
Chuck Lever | aa3d1fa | 2007-05-08 18:23:28 -0400 | [diff] [blame] | 763 | return &buf->data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 765 | EXPORT_SYMBOL_GPL(rpc_malloc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | |
Chuck Lever | 0210714 | 2006-01-03 09:55:49 +0100 | [diff] [blame] | 767 | /** |
| 768 | * rpc_free - free buffer allocated via rpc_malloc |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 769 | * @buffer: buffer to free |
Chuck Lever | 0210714 | 2006-01-03 09:55:49 +0100 | [diff] [blame] | 770 | * |
| 771 | */ |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 772 | void rpc_free(void *buffer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | { |
Chuck Lever | aa3d1fa | 2007-05-08 18:23:28 -0400 | [diff] [blame] | 774 | size_t size; |
| 775 | struct rpc_buffer *buf; |
Chuck Lever | 0210714 | 2006-01-03 09:55:49 +0100 | [diff] [blame] | 776 | |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 777 | if (!buffer) |
| 778 | return; |
Chuck Lever | aa3d1fa | 2007-05-08 18:23:28 -0400 | [diff] [blame] | 779 | |
| 780 | buf = container_of(buffer, struct rpc_buffer, data); |
| 781 | size = buf->len; |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 782 | |
Geert Uytterhoeven | 215d067 | 2007-05-08 11:37:26 +0200 | [diff] [blame] | 783 | dprintk("RPC: freeing buffer of size %zu at %p\n", |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 784 | size, buf); |
Chuck Lever | aa3d1fa | 2007-05-08 18:23:28 -0400 | [diff] [blame] | 785 | |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 786 | if (size <= RPC_BUFFER_MAXSIZE) |
| 787 | mempool_free(buf, rpc_buffer_mempool); |
| 788 | else |
| 789 | kfree(buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 791 | EXPORT_SYMBOL_GPL(rpc_free); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | |
| 793 | /* |
| 794 | * Creation and deletion of RPC task structures |
| 795 | */ |
Trond Myklebust | 47fe064 | 2007-10-25 18:42:55 -0400 | [diff] [blame] | 796 | 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] | 797 | { |
| 798 | memset(task, 0, sizeof(*task)); |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 799 | atomic_set(&task->tk_count, 1); |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 800 | task->tk_flags = task_setup_data->flags; |
| 801 | task->tk_ops = task_setup_data->callback_ops; |
| 802 | task->tk_calldata = task_setup_data->callback_data; |
Trond Myklebust | 6529eba | 2007-06-14 16:40:14 -0400 | [diff] [blame] | 803 | INIT_LIST_HEAD(&task->tk_task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | |
| 805 | /* Initialize retry counters */ |
| 806 | task->tk_garb_retry = 2; |
| 807 | task->tk_cred_retry = 2; |
| 808 | |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 809 | task->tk_priority = task_setup_data->priority - RPC_PRIORITY_LOW; |
| 810 | task->tk_owner = current->tgid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | |
| 812 | /* Initialize workqueue for async tasks */ |
Trond Myklebust | 32bfb5c | 2008-02-19 20:04:21 -0500 | [diff] [blame] | 813 | task->tk_workqueue = task_setup_data->workqueue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 814 | |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 815 | task->tk_client = task_setup_data->rpc_client; |
| 816 | if (task->tk_client != NULL) { |
| 817 | kref_get(&task->tk_client->cl_kref); |
| 818 | if (task->tk_client->cl_softrtry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | task->tk_flags |= RPC_TASK_SOFT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | } |
| 821 | |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 822 | if (task->tk_ops->rpc_call_prepare != NULL) |
| 823 | task->tk_action = rpc_prepare_task; |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 824 | |
Trond Myklebust | b3ef8b3 | 2007-10-25 18:32:34 -0400 | [diff] [blame] | 825 | if (task_setup_data->rpc_message != NULL) { |
Trond Myklebust | 4ccda2c | 2008-03-12 16:20:55 -0400 | [diff] [blame] | 826 | task->tk_msg.rpc_proc = task_setup_data->rpc_message->rpc_proc; |
| 827 | task->tk_msg.rpc_argp = task_setup_data->rpc_message->rpc_argp; |
| 828 | task->tk_msg.rpc_resp = task_setup_data->rpc_message->rpc_resp; |
Trond Myklebust | b3ef8b3 | 2007-10-25 18:32:34 -0400 | [diff] [blame] | 829 | /* Bind the user cred */ |
Trond Myklebust | 4ccda2c | 2008-03-12 16:20:55 -0400 | [diff] [blame] | 830 | rpcauth_bindcred(task, task_setup_data->rpc_message->rpc_cred, task_setup_data->flags); |
Trond Myklebust | b3ef8b3 | 2007-10-25 18:32:34 -0400 | [diff] [blame] | 831 | if (task->tk_action == NULL) |
| 832 | rpc_call_start(task); |
| 833 | } |
| 834 | |
Chuck Lever | ef759a2 | 2006-03-20 13:44:17 -0500 | [diff] [blame] | 835 | /* starting timestamp */ |
| 836 | task->tk_start = jiffies; |
| 837 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 838 | dprintk("RPC: new task initialized, procpid %u\n", |
Pavel Emelyanov | ba25f9d | 2007-10-18 23:40:40 -0700 | [diff] [blame] | 839 | task_pid_nr(current)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | } |
| 841 | |
| 842 | static struct rpc_task * |
| 843 | rpc_alloc_task(void) |
| 844 | { |
| 845 | return (struct rpc_task *)mempool_alloc(rpc_task_mempool, GFP_NOFS); |
| 846 | } |
| 847 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | /* |
Trond Myklebust | 90c5755 | 2007-06-09 19:49:36 -0400 | [diff] [blame] | 849 | * Create a new task for the specified client. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 850 | */ |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 851 | 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] | 852 | { |
Trond Myklebust | e8f5d77 | 2007-10-25 18:42:53 -0400 | [diff] [blame] | 853 | struct rpc_task *task = setup_data->task; |
| 854 | unsigned short flags = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | |
Trond Myklebust | e8f5d77 | 2007-10-25 18:42:53 -0400 | [diff] [blame] | 856 | if (task == NULL) { |
| 857 | task = rpc_alloc_task(); |
| 858 | if (task == NULL) |
| 859 | goto out; |
| 860 | flags = RPC_TASK_DYNAMIC; |
| 861 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 863 | rpc_init_task(task, setup_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | |
Trond Myklebust | e8f5d77 | 2007-10-25 18:42:53 -0400 | [diff] [blame] | 865 | task->tk_flags |= flags; |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 866 | dprintk("RPC: allocated task %p\n", task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | out: |
| 868 | return task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | } |
| 870 | |
Trond Myklebust | 32bfb5c | 2008-02-19 20:04:21 -0500 | [diff] [blame] | 871 | static void rpc_free_task(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | { |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 873 | const struct rpc_call_ops *tk_ops = task->tk_ops; |
| 874 | void *calldata = task->tk_calldata; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | |
Trond Myklebust | 5e4424a | 2008-02-25 21:53:49 -0800 | [diff] [blame] | 876 | if (task->tk_flags & RPC_TASK_DYNAMIC) { |
| 877 | dprintk("RPC: %5u freeing task\n", task->tk_pid); |
| 878 | mempool_free(task, rpc_task_mempool); |
| 879 | } |
Trond Myklebust | 32bfb5c | 2008-02-19 20:04:21 -0500 | [diff] [blame] | 880 | rpc_release_calldata(tk_ops, calldata); |
| 881 | } |
| 882 | |
| 883 | static void rpc_async_release(struct work_struct *work) |
| 884 | { |
| 885 | rpc_free_task(container_of(work, struct rpc_task, u.tk_work)); |
| 886 | } |
| 887 | |
| 888 | void rpc_put_task(struct rpc_task *task) |
| 889 | { |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 890 | if (!atomic_dec_and_test(&task->tk_count)) |
| 891 | return; |
| 892 | /* Release resources */ |
| 893 | if (task->tk_rqstp) |
| 894 | xprt_release(task); |
| 895 | if (task->tk_msg.rpc_cred) |
| 896 | rpcauth_unbindcred(task); |
| 897 | if (task->tk_client) { |
| 898 | rpc_release_client(task->tk_client); |
| 899 | task->tk_client = NULL; |
| 900 | } |
Trond Myklebust | 32bfb5c | 2008-02-19 20:04:21 -0500 | [diff] [blame] | 901 | if (task->tk_workqueue != NULL) { |
| 902 | INIT_WORK(&task->u.tk_work, rpc_async_release); |
| 903 | queue_work(task->tk_workqueue, &task->u.tk_work); |
| 904 | } else |
| 905 | rpc_free_task(task); |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 906 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 907 | EXPORT_SYMBOL_GPL(rpc_put_task); |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 908 | |
Trond Myklebust | bde8f00 | 2007-01-24 11:54:53 -0800 | [diff] [blame] | 909 | static void rpc_release_task(struct rpc_task *task) |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 910 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 911 | #ifdef RPC_DEBUG |
| 912 | BUG_ON(task->tk_magic != RPC_TASK_MAGIC_ID); |
| 913 | #endif |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 914 | dprintk("RPC: %5u release task\n", task->tk_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 915 | |
Trond Myklebust | 6529eba | 2007-06-14 16:40:14 -0400 | [diff] [blame] | 916 | if (!list_empty(&task->tk_task)) { |
Trond Myklebust | 4bef61f | 2007-06-16 14:17:01 -0400 | [diff] [blame] | 917 | struct rpc_clnt *clnt = task->tk_client; |
Trond Myklebust | 6529eba | 2007-06-14 16:40:14 -0400 | [diff] [blame] | 918 | /* Remove from client task list */ |
Trond Myklebust | 4bef61f | 2007-06-16 14:17:01 -0400 | [diff] [blame] | 919 | spin_lock(&clnt->cl_lock); |
Trond Myklebust | 6529eba | 2007-06-14 16:40:14 -0400 | [diff] [blame] | 920 | list_del(&task->tk_task); |
Trond Myklebust | 4bef61f | 2007-06-16 14:17:01 -0400 | [diff] [blame] | 921 | spin_unlock(&clnt->cl_lock); |
Trond Myklebust | 6529eba | 2007-06-14 16:40:14 -0400 | [diff] [blame] | 922 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 923 | BUG_ON (RPC_IS_QUEUED(task)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 925 | #ifdef RPC_DEBUG |
| 926 | task->tk_magic = 0; |
| 927 | #endif |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 928 | /* Wake up anyone who is waiting for task completion */ |
| 929 | rpc_mark_complete_task(task); |
| 930 | |
| 931 | rpc_put_task(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 932 | } |
| 933 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 934 | /* |
| 935 | * Kill all tasks for the given client. |
| 936 | * XXX: kill their descendants as well? |
| 937 | */ |
Trond Myklebust | 4bef61f | 2007-06-16 14:17:01 -0400 | [diff] [blame] | 938 | void rpc_killall_tasks(struct rpc_clnt *clnt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | { |
| 940 | struct rpc_task *rovr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 941 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | |
Trond Myklebust | 4bef61f | 2007-06-16 14:17:01 -0400 | [diff] [blame] | 943 | if (list_empty(&clnt->cl_tasks)) |
| 944 | return; |
| 945 | dprintk("RPC: killing all tasks for client %p\n", clnt); |
| 946 | /* |
| 947 | * Spin lock all_tasks to prevent changes... |
| 948 | */ |
| 949 | spin_lock(&clnt->cl_lock); |
| 950 | list_for_each_entry(rovr, &clnt->cl_tasks, tk_task) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 951 | if (! RPC_IS_ACTIVATED(rovr)) |
| 952 | continue; |
Trond Myklebust | 6529eba | 2007-06-14 16:40:14 -0400 | [diff] [blame] | 953 | if (!(rovr->tk_flags & RPC_TASK_KILLED)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | rovr->tk_flags |= RPC_TASK_KILLED; |
| 955 | rpc_exit(rovr, -EIO); |
| 956 | rpc_wake_up_task(rovr); |
| 957 | } |
| 958 | } |
Trond Myklebust | 4bef61f | 2007-06-16 14:17:01 -0400 | [diff] [blame] | 959 | spin_unlock(&clnt->cl_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 961 | EXPORT_SYMBOL_GPL(rpc_killall_tasks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 962 | |
Trond Myklebust | b247bbf | 2007-07-19 16:32:20 -0400 | [diff] [blame] | 963 | int rpciod_up(void) |
| 964 | { |
| 965 | return try_module_get(THIS_MODULE) ? 0 : -EINVAL; |
| 966 | } |
| 967 | |
| 968 | void rpciod_down(void) |
| 969 | { |
| 970 | module_put(THIS_MODULE); |
| 971 | } |
| 972 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 973 | /* |
Trond Myklebust | b247bbf | 2007-07-19 16:32:20 -0400 | [diff] [blame] | 974 | * Start up the rpciod workqueue. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 975 | */ |
Trond Myklebust | b247bbf | 2007-07-19 16:32:20 -0400 | [diff] [blame] | 976 | static int rpciod_start(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 977 | { |
| 978 | struct workqueue_struct *wq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 979 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 980 | /* |
| 981 | * Create the rpciod thread and wait for it to start. |
| 982 | */ |
Trond Myklebust | ab418d7 | 2007-06-14 17:08:36 -0400 | [diff] [blame] | 983 | dprintk("RPC: creating workqueue rpciod\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | wq = create_workqueue("rpciod"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 985 | rpciod_workqueue = wq; |
Trond Myklebust | b247bbf | 2007-07-19 16:32:20 -0400 | [diff] [blame] | 986 | return rpciod_workqueue != NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 987 | } |
| 988 | |
Trond Myklebust | b247bbf | 2007-07-19 16:32:20 -0400 | [diff] [blame] | 989 | static void rpciod_stop(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | { |
Trond Myklebust | b247bbf | 2007-07-19 16:32:20 -0400 | [diff] [blame] | 991 | struct workqueue_struct *wq = NULL; |
Trond Myklebust | ab418d7 | 2007-06-14 17:08:36 -0400 | [diff] [blame] | 992 | |
Trond Myklebust | b247bbf | 2007-07-19 16:32:20 -0400 | [diff] [blame] | 993 | if (rpciod_workqueue == NULL) |
| 994 | return; |
Trond Myklebust | ab418d7 | 2007-06-14 17:08:36 -0400 | [diff] [blame] | 995 | dprintk("RPC: destroying workqueue rpciod\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 996 | |
Trond Myklebust | b247bbf | 2007-07-19 16:32:20 -0400 | [diff] [blame] | 997 | wq = rpciod_workqueue; |
| 998 | rpciod_workqueue = NULL; |
| 999 | destroy_workqueue(wq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1000 | } |
| 1001 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1002 | void |
| 1003 | rpc_destroy_mempool(void) |
| 1004 | { |
Trond Myklebust | b247bbf | 2007-07-19 16:32:20 -0400 | [diff] [blame] | 1005 | rpciod_stop(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1006 | if (rpc_buffer_mempool) |
| 1007 | mempool_destroy(rpc_buffer_mempool); |
| 1008 | if (rpc_task_mempool) |
| 1009 | mempool_destroy(rpc_task_mempool); |
Alexey Dobriyan | 1a1d92c | 2006-09-27 01:49:40 -0700 | [diff] [blame] | 1010 | if (rpc_task_slabp) |
| 1011 | kmem_cache_destroy(rpc_task_slabp); |
| 1012 | if (rpc_buffer_slabp) |
| 1013 | kmem_cache_destroy(rpc_buffer_slabp); |
Trond Myklebust | f6a1cc8 | 2008-02-22 17:06:55 -0500 | [diff] [blame] | 1014 | rpc_destroy_wait_queue(&delay_queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1015 | } |
| 1016 | |
| 1017 | int |
| 1018 | rpc_init_mempool(void) |
| 1019 | { |
Trond Myklebust | f6a1cc8 | 2008-02-22 17:06:55 -0500 | [diff] [blame] | 1020 | /* |
| 1021 | * The following is not strictly a mempool initialisation, |
| 1022 | * but there is no harm in doing it here |
| 1023 | */ |
| 1024 | rpc_init_wait_queue(&delay_queue, "delayq"); |
| 1025 | if (!rpciod_start()) |
| 1026 | goto err_nomem; |
| 1027 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1028 | rpc_task_slabp = kmem_cache_create("rpc_tasks", |
| 1029 | sizeof(struct rpc_task), |
| 1030 | 0, SLAB_HWCACHE_ALIGN, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 1031 | NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1032 | if (!rpc_task_slabp) |
| 1033 | goto err_nomem; |
| 1034 | rpc_buffer_slabp = kmem_cache_create("rpc_buffers", |
| 1035 | RPC_BUFFER_MAXSIZE, |
| 1036 | 0, SLAB_HWCACHE_ALIGN, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 1037 | NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1038 | if (!rpc_buffer_slabp) |
| 1039 | goto err_nomem; |
Matthew Dobson | 93d2341 | 2006-03-26 01:37:50 -0800 | [diff] [blame] | 1040 | rpc_task_mempool = mempool_create_slab_pool(RPC_TASK_POOLSIZE, |
| 1041 | rpc_task_slabp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1042 | if (!rpc_task_mempool) |
| 1043 | goto err_nomem; |
Matthew Dobson | 93d2341 | 2006-03-26 01:37:50 -0800 | [diff] [blame] | 1044 | rpc_buffer_mempool = mempool_create_slab_pool(RPC_BUFFER_POOLSIZE, |
| 1045 | rpc_buffer_slabp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1046 | if (!rpc_buffer_mempool) |
| 1047 | goto err_nomem; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1048 | return 0; |
| 1049 | err_nomem: |
| 1050 | rpc_destroy_mempool(); |
| 1051 | return -ENOMEM; |
| 1052 | } |