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> |
Jeff Layton | d310310 | 2011-12-01 22:44:39 +0100 | [diff] [blame] | 21 | #include <linux/freezer.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | |
| 23 | #include <linux/sunrpc/clnt.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | |
Benny Halevy | 6951867 | 2009-09-10 12:25:04 +0300 | [diff] [blame] | 25 | #include "sunrpc.h" |
| 26 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | #ifdef RPC_DEBUG |
| 28 | #define RPCDBG_FACILITY RPCDBG_SCHED |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #endif |
| 30 | |
Trond Myklebust | 82b0a4c | 2012-01-20 14:52:23 -0500 | [diff] [blame] | 31 | #define CREATE_TRACE_POINTS |
| 32 | #include <trace/events/sunrpc.h> |
| 33 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | /* |
| 35 | * RPC slabs and memory pools |
| 36 | */ |
| 37 | #define RPC_BUFFER_MAXSIZE (2048) |
| 38 | #define RPC_BUFFER_POOLSIZE (8) |
| 39 | #define RPC_TASK_POOLSIZE (8) |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 40 | static struct kmem_cache *rpc_task_slabp __read_mostly; |
| 41 | static struct kmem_cache *rpc_buffer_slabp __read_mostly; |
Eric Dumazet | ba89966 | 2005-08-26 12:05:31 -0700 | [diff] [blame] | 42 | static mempool_t *rpc_task_mempool __read_mostly; |
| 43 | static mempool_t *rpc_buffer_mempool __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | |
David Howells | 65f27f3 | 2006-11-22 14:55:48 +0000 | [diff] [blame] | 45 | static void rpc_async_schedule(struct work_struct *); |
Trond Myklebust | bde8f00 | 2007-01-24 11:54:53 -0800 | [diff] [blame] | 46 | static void rpc_release_task(struct rpc_task *task); |
Trond Myklebust | 36df9aa | 2007-07-18 16:18:52 -0400 | [diff] [blame] | 47 | static void __rpc_queue_timer_fn(unsigned long ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | |
| 49 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | * RPC tasks sit here while waiting for conditions to improve. |
| 51 | */ |
Trond Myklebust | a4a8749 | 2007-07-18 13:24:19 -0400 | [diff] [blame] | 52 | static struct rpc_wait_queue delay_queue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | |
| 54 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | * rpciod-related stuff |
| 56 | */ |
Trond Myklebust | 24c5d9d | 2006-03-20 13:44:08 -0500 | [diff] [blame] | 57 | struct workqueue_struct *rpciod_workqueue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | |
| 59 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | * Disable the timer for a given RPC task. Should be called with |
| 61 | * queue->lock and bh_disabled in order to avoid races within |
| 62 | * rpc_run_timer(). |
| 63 | */ |
Trond Myklebust | 5d00837 | 2008-02-22 16:34:17 -0500 | [diff] [blame] | 64 | static void |
Trond Myklebust | eb276c0 | 2008-02-22 17:27:59 -0500 | [diff] [blame] | 65 | __rpc_disable_timer(struct rpc_wait_queue *queue, struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | { |
Trond Myklebust | 36df9aa | 2007-07-18 16:18:52 -0400 | [diff] [blame] | 67 | if (task->tk_timeout == 0) |
| 68 | return; |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 69 | dprintk("RPC: %5u disabling timer\n", task->tk_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | task->tk_timeout = 0; |
Trond Myklebust | 36df9aa | 2007-07-18 16:18:52 -0400 | [diff] [blame] | 71 | list_del(&task->u.tk_wait.timer_list); |
Trond Myklebust | eb276c0 | 2008-02-22 17:27:59 -0500 | [diff] [blame] | 72 | if (list_empty(&queue->timer_list.list)) |
| 73 | del_timer(&queue->timer_list.timer); |
Trond Myklebust | 36df9aa | 2007-07-18 16:18:52 -0400 | [diff] [blame] | 74 | } |
| 75 | |
| 76 | static void |
| 77 | rpc_set_queue_timer(struct rpc_wait_queue *queue, unsigned long expires) |
| 78 | { |
| 79 | queue->timer_list.expires = expires; |
| 80 | mod_timer(&queue->timer_list.timer, expires); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | } |
| 82 | |
| 83 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | * Set up a timer for the current task. |
| 85 | */ |
Trond Myklebust | 5d00837 | 2008-02-22 16:34:17 -0500 | [diff] [blame] | 86 | static void |
Trond Myklebust | eb276c0 | 2008-02-22 17:27:59 -0500 | [diff] [blame] | 87 | __rpc_add_timer(struct rpc_wait_queue *queue, struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | { |
| 89 | if (!task->tk_timeout) |
| 90 | return; |
| 91 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 92 | dprintk("RPC: %5u setting alarm for %lu ms\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | task->tk_pid, task->tk_timeout * 1000 / HZ); |
| 94 | |
Trond Myklebust | eb276c0 | 2008-02-22 17:27:59 -0500 | [diff] [blame] | 95 | task->u.tk_wait.expires = jiffies + task->tk_timeout; |
| 96 | if (list_empty(&queue->timer_list.list) || time_before(task->u.tk_wait.expires, queue->timer_list.expires)) |
| 97 | rpc_set_queue_timer(queue, task->u.tk_wait.expires); |
| 98 | list_add(&task->u.tk_wait.timer_list, &queue->timer_list.list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | } |
| 100 | |
| 101 | /* |
| 102 | * Add new request to a priority queue. |
| 103 | */ |
Trond Myklebust | 3b27bad | 2011-07-17 18:11:34 -0400 | [diff] [blame] | 104 | static void __rpc_add_wait_queue_priority(struct rpc_wait_queue *queue, |
| 105 | struct rpc_task *task, |
| 106 | unsigned char queue_priority) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | { |
| 108 | struct list_head *q; |
| 109 | struct rpc_task *t; |
| 110 | |
| 111 | INIT_LIST_HEAD(&task->u.tk_wait.links); |
Trond Myklebust | 3b27bad | 2011-07-17 18:11:34 -0400 | [diff] [blame] | 112 | q = &queue->tasks[queue_priority]; |
| 113 | if (unlikely(queue_priority > queue->maxpriority)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | q = &queue->tasks[queue->maxpriority]; |
| 115 | list_for_each_entry(t, q, u.tk_wait.list) { |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 116 | if (t->tk_owner == task->tk_owner) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | list_add_tail(&task->u.tk_wait.list, &t->u.tk_wait.links); |
| 118 | return; |
| 119 | } |
| 120 | } |
| 121 | list_add_tail(&task->u.tk_wait.list, q); |
| 122 | } |
| 123 | |
| 124 | /* |
| 125 | * Add new request to wait queue. |
| 126 | * |
| 127 | * Swapper tasks always get inserted at the head of the queue. |
| 128 | * This should avoid many nasty memory deadlocks and hopefully |
| 129 | * improve overall performance. |
| 130 | * Everyone else gets appended to the queue to ensure proper FIFO behavior. |
| 131 | */ |
Trond Myklebust | 3b27bad | 2011-07-17 18:11:34 -0400 | [diff] [blame] | 132 | static void __rpc_add_wait_queue(struct rpc_wait_queue *queue, |
| 133 | struct rpc_task *task, |
| 134 | unsigned char queue_priority) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | { |
| 136 | BUG_ON (RPC_IS_QUEUED(task)); |
| 137 | |
| 138 | if (RPC_IS_PRIORITY(queue)) |
Trond Myklebust | 3b27bad | 2011-07-17 18:11:34 -0400 | [diff] [blame] | 139 | __rpc_add_wait_queue_priority(queue, task, queue_priority); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | else if (RPC_IS_SWAPPER(task)) |
| 141 | list_add(&task->u.tk_wait.list, &queue->tasks[0]); |
| 142 | else |
| 143 | list_add_tail(&task->u.tk_wait.list, &queue->tasks[0]); |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 144 | task->tk_waitqueue = queue; |
Chuck Lever | e19b63d | 2006-03-20 13:44:15 -0500 | [diff] [blame] | 145 | queue->qlen++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | rpc_set_queued(task); |
| 147 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 148 | dprintk("RPC: %5u added to queue %p \"%s\"\n", |
| 149 | task->tk_pid, queue, rpc_qname(queue)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | } |
| 151 | |
| 152 | /* |
| 153 | * Remove request from a priority queue. |
| 154 | */ |
| 155 | static void __rpc_remove_wait_queue_priority(struct rpc_task *task) |
| 156 | { |
| 157 | struct rpc_task *t; |
| 158 | |
| 159 | if (!list_empty(&task->u.tk_wait.links)) { |
| 160 | t = list_entry(task->u.tk_wait.links.next, struct rpc_task, u.tk_wait.list); |
| 161 | list_move(&t->u.tk_wait.list, &task->u.tk_wait.list); |
| 162 | list_splice_init(&task->u.tk_wait.links, &t->u.tk_wait.links); |
| 163 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | } |
| 165 | |
| 166 | /* |
| 167 | * Remove request from queue. |
| 168 | * Note: must be called with spin lock held. |
| 169 | */ |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 170 | 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] | 171 | { |
Trond Myklebust | eb276c0 | 2008-02-22 17:27:59 -0500 | [diff] [blame] | 172 | __rpc_disable_timer(queue, task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | if (RPC_IS_PRIORITY(queue)) |
| 174 | __rpc_remove_wait_queue_priority(task); |
Trond Myklebust | 36df9aa | 2007-07-18 16:18:52 -0400 | [diff] [blame] | 175 | list_del(&task->u.tk_wait.list); |
Chuck Lever | e19b63d | 2006-03-20 13:44:15 -0500 | [diff] [blame] | 176 | queue->qlen--; |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 177 | dprintk("RPC: %5u removed from queue %p \"%s\"\n", |
| 178 | task->tk_pid, queue, rpc_qname(queue)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | } |
| 180 | |
| 181 | static inline void rpc_set_waitqueue_priority(struct rpc_wait_queue *queue, int priority) |
| 182 | { |
| 183 | queue->priority = priority; |
| 184 | queue->count = 1 << (priority * 2); |
| 185 | } |
| 186 | |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 187 | 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] | 188 | { |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 189 | queue->owner = pid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | queue->nr = RPC_BATCH_COUNT; |
| 191 | } |
| 192 | |
| 193 | static inline void rpc_reset_waitqueue_priority(struct rpc_wait_queue *queue) |
| 194 | { |
| 195 | rpc_set_waitqueue_priority(queue, queue->maxpriority); |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 196 | rpc_set_waitqueue_owner(queue, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | } |
| 198 | |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 199 | 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] | 200 | { |
| 201 | int i; |
| 202 | |
| 203 | spin_lock_init(&queue->lock); |
| 204 | for (i = 0; i < ARRAY_SIZE(queue->tasks); i++) |
| 205 | INIT_LIST_HEAD(&queue->tasks[i]); |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 206 | queue->maxpriority = nr_queues - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | rpc_reset_waitqueue_priority(queue); |
Trond Myklebust | 36df9aa | 2007-07-18 16:18:52 -0400 | [diff] [blame] | 208 | queue->qlen = 0; |
| 209 | setup_timer(&queue->timer_list.timer, __rpc_queue_timer_fn, (unsigned long)queue); |
| 210 | INIT_LIST_HEAD(&queue->timer_list.list); |
Trond Myklebust | 2f09c24 | 2012-02-08 22:01:15 -0500 | [diff] [blame] | 211 | rpc_assign_waitqueue_name(queue, qname); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | } |
| 213 | |
| 214 | void rpc_init_priority_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, RPC_NR_PRIORITY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | } |
Alexandros Batsakis | 689cf5c | 2009-12-14 21:27:56 -0800 | [diff] [blame] | 218 | EXPORT_SYMBOL_GPL(rpc_init_priority_wait_queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | |
| 220 | void rpc_init_wait_queue(struct rpc_wait_queue *queue, const char *qname) |
| 221 | { |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 222 | __rpc_init_priority_wait_queue(queue, qname, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 224 | EXPORT_SYMBOL_GPL(rpc_init_wait_queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | |
Trond Myklebust | f6a1cc8 | 2008-02-22 17:06:55 -0500 | [diff] [blame] | 226 | void rpc_destroy_wait_queue(struct rpc_wait_queue *queue) |
| 227 | { |
Trond Myklebust | 36df9aa | 2007-07-18 16:18:52 -0400 | [diff] [blame] | 228 | del_timer_sync(&queue->timer_list.timer); |
Trond Myklebust | f6a1cc8 | 2008-02-22 17:06:55 -0500 | [diff] [blame] | 229 | } |
| 230 | EXPORT_SYMBOL_GPL(rpc_destroy_wait_queue); |
| 231 | |
Matthew Wilcox | 150030b | 2007-12-06 16:24:39 -0500 | [diff] [blame] | 232 | static int rpc_wait_bit_killable(void *word) |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 233 | { |
Matthew Wilcox | 150030b | 2007-12-06 16:24:39 -0500 | [diff] [blame] | 234 | if (fatal_signal_pending(current)) |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 235 | return -ERESTARTSYS; |
Jeff Layton | d310310 | 2011-12-01 22:44:39 +0100 | [diff] [blame] | 236 | freezable_schedule(); |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 237 | return 0; |
| 238 | } |
| 239 | |
Trond Myklebust | c44fe70 | 2007-06-16 14:17:01 -0400 | [diff] [blame] | 240 | #ifdef RPC_DEBUG |
| 241 | static void rpc_task_set_debuginfo(struct rpc_task *task) |
| 242 | { |
| 243 | static atomic_t rpc_pid; |
| 244 | |
Trond Myklebust | c44fe70 | 2007-06-16 14:17:01 -0400 | [diff] [blame] | 245 | task->tk_pid = atomic_inc_return(&rpc_pid); |
| 246 | } |
| 247 | #else |
| 248 | static inline void rpc_task_set_debuginfo(struct rpc_task *task) |
| 249 | { |
| 250 | } |
| 251 | #endif |
| 252 | |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 253 | static void rpc_set_active(struct rpc_task *task) |
| 254 | { |
Trond Myklebust | 82b0a4c | 2012-01-20 14:52:23 -0500 | [diff] [blame] | 255 | trace_rpc_task_begin(task->tk_client, task, NULL); |
| 256 | |
Trond Myklebust | c44fe70 | 2007-06-16 14:17:01 -0400 | [diff] [blame] | 257 | rpc_task_set_debuginfo(task); |
Trond Myklebust | 58f9612 | 2010-07-31 14:29:08 -0400 | [diff] [blame] | 258 | set_bit(RPC_TASK_ACTIVE, &task->tk_runstate); |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 259 | } |
| 260 | |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 261 | /* |
| 262 | * Mark an RPC call as having completed by clearing the 'active' bit |
Trond Myklebust | bf294b4 | 2011-02-21 11:05:41 -0800 | [diff] [blame] | 263 | * and then waking up all tasks that were sleeping. |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 264 | */ |
Trond Myklebust | bf294b4 | 2011-02-21 11:05:41 -0800 | [diff] [blame] | 265 | static int rpc_complete_task(struct rpc_task *task) |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 266 | { |
Trond Myklebust | bf294b4 | 2011-02-21 11:05:41 -0800 | [diff] [blame] | 267 | void *m = &task->tk_runstate; |
| 268 | wait_queue_head_t *wq = bit_waitqueue(m, RPC_TASK_ACTIVE); |
| 269 | struct wait_bit_key k = __WAIT_BIT_KEY_INITIALIZER(m, RPC_TASK_ACTIVE); |
| 270 | unsigned long flags; |
| 271 | int ret; |
| 272 | |
Trond Myklebust | 82b0a4c | 2012-01-20 14:52:23 -0500 | [diff] [blame] | 273 | trace_rpc_task_complete(task->tk_client, task, NULL); |
| 274 | |
Trond Myklebust | bf294b4 | 2011-02-21 11:05:41 -0800 | [diff] [blame] | 275 | spin_lock_irqsave(&wq->lock, flags); |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 276 | clear_bit(RPC_TASK_ACTIVE, &task->tk_runstate); |
Trond Myklebust | bf294b4 | 2011-02-21 11:05:41 -0800 | [diff] [blame] | 277 | ret = atomic_dec_and_test(&task->tk_count); |
| 278 | if (waitqueue_active(wq)) |
| 279 | __wake_up_locked_key(wq, TASK_NORMAL, &k); |
| 280 | spin_unlock_irqrestore(&wq->lock, flags); |
| 281 | return ret; |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 282 | } |
| 283 | |
| 284 | /* |
| 285 | * Allow callers to wait for completion of an RPC call |
Trond Myklebust | bf294b4 | 2011-02-21 11:05:41 -0800 | [diff] [blame] | 286 | * |
| 287 | * Note the use of out_of_line_wait_on_bit() rather than wait_on_bit() |
| 288 | * to enforce taking of the wq->lock and hence avoid races with |
| 289 | * rpc_complete_task(). |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 290 | */ |
| 291 | int __rpc_wait_for_completion_task(struct rpc_task *task, int (*action)(void *)) |
| 292 | { |
| 293 | if (action == NULL) |
Matthew Wilcox | 150030b | 2007-12-06 16:24:39 -0500 | [diff] [blame] | 294 | action = rpc_wait_bit_killable; |
Trond Myklebust | bf294b4 | 2011-02-21 11:05:41 -0800 | [diff] [blame] | 295 | return out_of_line_wait_on_bit(&task->tk_runstate, RPC_TASK_ACTIVE, |
Matthew Wilcox | 150030b | 2007-12-06 16:24:39 -0500 | [diff] [blame] | 296 | action, TASK_KILLABLE); |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 297 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 298 | EXPORT_SYMBOL_GPL(__rpc_wait_for_completion_task); |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 299 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | /* |
| 301 | * Make an RPC task runnable. |
| 302 | * |
Jeff Layton | 506026c | 2012-07-23 15:51:55 -0400 | [diff] [blame] | 303 | * Note: If the task is ASYNC, and is being made runnable after sitting on an |
| 304 | * rpc_wait_queue, this must be called with the queue spinlock held to protect |
| 305 | * the wait queue operation. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | */ |
| 307 | static void rpc_make_runnable(struct rpc_task *task) |
| 308 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | rpc_clear_queued(task); |
Christophe Saout | cc4dc59e | 2006-11-05 18:42:48 +0100 | [diff] [blame] | 310 | if (rpc_test_and_set_running(task)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | return; |
| 312 | if (RPC_IS_ASYNC(task)) { |
David Howells | 65f27f3 | 2006-11-22 14:55:48 +0000 | [diff] [blame] | 313 | INIT_WORK(&task->u.tk_work, rpc_async_schedule); |
Fred Isaman | cee6a53 | 2011-02-11 15:42:35 +0000 | [diff] [blame] | 314 | queue_work(rpciod_workqueue, &task->u.tk_work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | } else |
Trond Myklebust | 96651ab | 2005-06-22 17:16:21 +0000 | [diff] [blame] | 316 | wake_up_bit(&task->tk_runstate, RPC_TASK_QUEUED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | } |
| 318 | |
| 319 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | * Prepare for sleeping on a wait queue. |
| 321 | * By always appending tasks to the list we ensure FIFO behavior. |
| 322 | * NB: An RPC task will only receive interrupt-driven events as long |
| 323 | * as it's on a wait queue. |
| 324 | */ |
Trond Myklebust | 3b27bad | 2011-07-17 18:11:34 -0400 | [diff] [blame] | 325 | static void __rpc_sleep_on_priority(struct rpc_wait_queue *q, |
| 326 | struct rpc_task *task, |
| 327 | rpc_action action, |
| 328 | unsigned char queue_priority) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | { |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 330 | dprintk("RPC: %5u sleep_on(queue \"%s\" time %lu)\n", |
| 331 | task->tk_pid, rpc_qname(q), jiffies); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | |
Trond Myklebust | 82b0a4c | 2012-01-20 14:52:23 -0500 | [diff] [blame] | 333 | trace_rpc_task_sleep(task->tk_client, task, q); |
| 334 | |
Trond Myklebust | 3b27bad | 2011-07-17 18:11:34 -0400 | [diff] [blame] | 335 | __rpc_add_wait_queue(q, task, queue_priority); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | |
| 337 | BUG_ON(task->tk_callback != NULL); |
| 338 | task->tk_callback = action; |
Trond Myklebust | eb276c0 | 2008-02-22 17:27:59 -0500 | [diff] [blame] | 339 | __rpc_add_timer(q, task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | } |
| 341 | |
| 342 | 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] | 343 | rpc_action action) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | { |
Trond Myklebust | 58f9612 | 2010-07-31 14:29:08 -0400 | [diff] [blame] | 345 | /* We shouldn't ever put an inactive task to sleep */ |
| 346 | BUG_ON(!RPC_IS_ACTIVATED(task)); |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 347 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | /* |
| 349 | * Protect the queue operations. |
| 350 | */ |
| 351 | spin_lock_bh(&q->lock); |
Trond Myklebust | 3b27bad | 2011-07-17 18:11:34 -0400 | [diff] [blame] | 352 | __rpc_sleep_on_priority(q, task, action, task->tk_priority); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | spin_unlock_bh(&q->lock); |
| 354 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 355 | EXPORT_SYMBOL_GPL(rpc_sleep_on); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | |
Trond Myklebust | 3b27bad | 2011-07-17 18:11:34 -0400 | [diff] [blame] | 357 | void rpc_sleep_on_priority(struct rpc_wait_queue *q, struct rpc_task *task, |
| 358 | rpc_action action, int priority) |
| 359 | { |
| 360 | /* We shouldn't ever put an inactive task to sleep */ |
| 361 | BUG_ON(!RPC_IS_ACTIVATED(task)); |
| 362 | |
| 363 | /* |
| 364 | * Protect the queue operations. |
| 365 | */ |
| 366 | spin_lock_bh(&q->lock); |
| 367 | __rpc_sleep_on_priority(q, task, action, priority - RPC_PRIORITY_LOW); |
| 368 | spin_unlock_bh(&q->lock); |
| 369 | } |
| 370 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | /** |
| 372 | * __rpc_do_wake_up_task - wake up a single rpc_task |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 373 | * @queue: wait queue |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | * @task: task to be woken up |
| 375 | * |
| 376 | * Caller must hold queue->lock, and have cleared the task queued flag. |
| 377 | */ |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 378 | 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] | 379 | { |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 380 | dprintk("RPC: %5u __rpc_wake_up_task (now %lu)\n", |
| 381 | task->tk_pid, jiffies); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | /* Has the task been executed yet? If not, we cannot wake it up! */ |
| 384 | if (!RPC_IS_ACTIVATED(task)) { |
| 385 | printk(KERN_ERR "RPC: Inactive task (%p) being woken up!\n", task); |
| 386 | return; |
| 387 | } |
| 388 | |
Trond Myklebust | 82b0a4c | 2012-01-20 14:52:23 -0500 | [diff] [blame] | 389 | trace_rpc_task_wakeup(task->tk_client, task, queue); |
| 390 | |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 391 | __rpc_remove_wait_queue(queue, task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | |
| 393 | rpc_make_runnable(task); |
| 394 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 395 | dprintk("RPC: __rpc_wake_up_task done\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | } |
| 397 | |
| 398 | /* |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 399 | * Wake up a queued task while the queue lock is being held |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | */ |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 401 | 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] | 402 | { |
Trond Myklebust | f5fb7b06 | 2008-02-25 21:40:50 -0800 | [diff] [blame] | 403 | if (RPC_IS_QUEUED(task) && task->tk_waitqueue == queue) |
| 404 | __rpc_do_wake_up_task(queue, task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | } |
| 406 | |
| 407 | /* |
Alexandros Batsakis | 48f1861 | 2009-12-14 21:27:53 -0800 | [diff] [blame] | 408 | * Tests whether rpc queue is empty |
| 409 | */ |
| 410 | int rpc_queue_empty(struct rpc_wait_queue *queue) |
| 411 | { |
| 412 | int res; |
| 413 | |
| 414 | spin_lock_bh(&queue->lock); |
| 415 | res = queue->qlen; |
| 416 | spin_unlock_bh(&queue->lock); |
Eric Dumazet | a02cec2 | 2010-09-22 20:43:57 +0000 | [diff] [blame] | 417 | return res == 0; |
Alexandros Batsakis | 48f1861 | 2009-12-14 21:27:53 -0800 | [diff] [blame] | 418 | } |
| 419 | EXPORT_SYMBOL_GPL(rpc_queue_empty); |
| 420 | |
| 421 | /* |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 422 | * Wake up a task on a specific queue |
| 423 | */ |
| 424 | void rpc_wake_up_queued_task(struct rpc_wait_queue *queue, struct rpc_task *task) |
| 425 | { |
Trond Myklebust | 5e4424a | 2008-02-25 21:53:49 -0800 | [diff] [blame] | 426 | spin_lock_bh(&queue->lock); |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 427 | rpc_wake_up_task_queue_locked(queue, task); |
Trond Myklebust | 5e4424a | 2008-02-25 21:53:49 -0800 | [diff] [blame] | 428 | spin_unlock_bh(&queue->lock); |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 429 | } |
| 430 | EXPORT_SYMBOL_GPL(rpc_wake_up_queued_task); |
| 431 | |
| 432 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | * Wake up the next task on a priority queue. |
| 434 | */ |
Trond Myklebust | 961a828 | 2012-01-17 22:57:37 -0500 | [diff] [blame] | 435 | static struct rpc_task *__rpc_find_next_queued_priority(struct rpc_wait_queue *queue) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | { |
| 437 | struct list_head *q; |
| 438 | struct rpc_task *task; |
| 439 | |
| 440 | /* |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 441 | * Service a batch of tasks from a single owner. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | */ |
| 443 | q = &queue->tasks[queue->priority]; |
| 444 | if (!list_empty(q)) { |
| 445 | task = list_entry(q->next, struct rpc_task, u.tk_wait.list); |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 446 | if (queue->owner == task->tk_owner) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | if (--queue->nr) |
| 448 | goto out; |
| 449 | list_move_tail(&task->u.tk_wait.list, q); |
| 450 | } |
| 451 | /* |
| 452 | * Check if we need to switch queues. |
| 453 | */ |
| 454 | if (--queue->count) |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 455 | goto new_owner; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | } |
| 457 | |
| 458 | /* |
| 459 | * Service the next queue. |
| 460 | */ |
| 461 | do { |
| 462 | if (q == &queue->tasks[0]) |
| 463 | q = &queue->tasks[queue->maxpriority]; |
| 464 | else |
| 465 | q = q - 1; |
| 466 | if (!list_empty(q)) { |
| 467 | task = list_entry(q->next, struct rpc_task, u.tk_wait.list); |
| 468 | goto new_queue; |
| 469 | } |
| 470 | } while (q != &queue->tasks[queue->priority]); |
| 471 | |
| 472 | rpc_reset_waitqueue_priority(queue); |
| 473 | return NULL; |
| 474 | |
| 475 | new_queue: |
| 476 | rpc_set_waitqueue_priority(queue, (unsigned int)(q - &queue->tasks[0])); |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 477 | new_owner: |
| 478 | rpc_set_waitqueue_owner(queue, task->tk_owner); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | return task; |
| 481 | } |
| 482 | |
Trond Myklebust | 961a828 | 2012-01-17 22:57:37 -0500 | [diff] [blame] | 483 | static struct rpc_task *__rpc_find_next_queued(struct rpc_wait_queue *queue) |
| 484 | { |
| 485 | if (RPC_IS_PRIORITY(queue)) |
| 486 | return __rpc_find_next_queued_priority(queue); |
| 487 | if (!list_empty(&queue->tasks[0])) |
| 488 | return list_first_entry(&queue->tasks[0], struct rpc_task, u.tk_wait.list); |
| 489 | return NULL; |
| 490 | } |
| 491 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | /* |
Trond Myklebust | 961a828 | 2012-01-17 22:57:37 -0500 | [diff] [blame] | 493 | * Wake up the first task on the wait queue. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | */ |
Trond Myklebust | 961a828 | 2012-01-17 22:57:37 -0500 | [diff] [blame] | 495 | struct rpc_task *rpc_wake_up_first(struct rpc_wait_queue *queue, |
| 496 | bool (*func)(struct rpc_task *, void *), void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | { |
| 498 | struct rpc_task *task = NULL; |
| 499 | |
Trond Myklebust | 961a828 | 2012-01-17 22:57:37 -0500 | [diff] [blame] | 500 | dprintk("RPC: wake_up_first(%p \"%s\")\n", |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 501 | queue, rpc_qname(queue)); |
Trond Myklebust | 5e4424a | 2008-02-25 21:53:49 -0800 | [diff] [blame] | 502 | spin_lock_bh(&queue->lock); |
Trond Myklebust | 961a828 | 2012-01-17 22:57:37 -0500 | [diff] [blame] | 503 | task = __rpc_find_next_queued(queue); |
| 504 | if (task != NULL) { |
| 505 | if (func(task, data)) |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 506 | rpc_wake_up_task_queue_locked(queue, task); |
Trond Myklebust | 961a828 | 2012-01-17 22:57:37 -0500 | [diff] [blame] | 507 | else |
| 508 | task = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | } |
Trond Myklebust | 5e4424a | 2008-02-25 21:53:49 -0800 | [diff] [blame] | 510 | spin_unlock_bh(&queue->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | |
| 512 | return task; |
| 513 | } |
Trond Myklebust | 961a828 | 2012-01-17 22:57:37 -0500 | [diff] [blame] | 514 | EXPORT_SYMBOL_GPL(rpc_wake_up_first); |
| 515 | |
| 516 | static bool rpc_wake_up_next_func(struct rpc_task *task, void *data) |
| 517 | { |
| 518 | return true; |
| 519 | } |
| 520 | |
| 521 | /* |
| 522 | * Wake up the next task on the wait queue. |
| 523 | */ |
| 524 | struct rpc_task *rpc_wake_up_next(struct rpc_wait_queue *queue) |
| 525 | { |
| 526 | return rpc_wake_up_first(queue, rpc_wake_up_next_func, NULL); |
| 527 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 528 | EXPORT_SYMBOL_GPL(rpc_wake_up_next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | |
| 530 | /** |
| 531 | * rpc_wake_up - wake up all rpc_tasks |
| 532 | * @queue: rpc_wait_queue on which the tasks are sleeping |
| 533 | * |
| 534 | * Grabs queue->lock |
| 535 | */ |
| 536 | void rpc_wake_up(struct rpc_wait_queue *queue) |
| 537 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | struct list_head *head; |
Trond Myklebust | e6d83d5 | 2006-03-13 21:20:48 -0800 | [diff] [blame] | 539 | |
Trond Myklebust | 5e4424a | 2008-02-25 21:53:49 -0800 | [diff] [blame] | 540 | spin_lock_bh(&queue->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | head = &queue->tasks[queue->maxpriority]; |
| 542 | for (;;) { |
Trond Myklebust | 540a0f7 | 2012-03-19 13:39:35 -0400 | [diff] [blame] | 543 | while (!list_empty(head)) { |
| 544 | struct rpc_task *task; |
| 545 | task = list_first_entry(head, |
| 546 | struct rpc_task, |
| 547 | u.tk_wait.list); |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 548 | rpc_wake_up_task_queue_locked(queue, task); |
Trond Myklebust | 540a0f7 | 2012-03-19 13:39:35 -0400 | [diff] [blame] | 549 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | if (head == &queue->tasks[0]) |
| 551 | break; |
| 552 | head--; |
| 553 | } |
Trond Myklebust | 5e4424a | 2008-02-25 21:53:49 -0800 | [diff] [blame] | 554 | spin_unlock_bh(&queue->lock); |
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_wake_up); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | |
| 558 | /** |
| 559 | * rpc_wake_up_status - wake up all rpc_tasks and set their status value. |
| 560 | * @queue: rpc_wait_queue on which the tasks are sleeping |
| 561 | * @status: status value to set |
| 562 | * |
| 563 | * Grabs queue->lock |
| 564 | */ |
| 565 | void rpc_wake_up_status(struct rpc_wait_queue *queue, int status) |
| 566 | { |
| 567 | struct list_head *head; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | |
Trond Myklebust | 5e4424a | 2008-02-25 21:53:49 -0800 | [diff] [blame] | 569 | spin_lock_bh(&queue->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | head = &queue->tasks[queue->maxpriority]; |
| 571 | for (;;) { |
Trond Myklebust | 540a0f7 | 2012-03-19 13:39:35 -0400 | [diff] [blame] | 572 | while (!list_empty(head)) { |
| 573 | struct rpc_task *task; |
| 574 | task = list_first_entry(head, |
| 575 | struct rpc_task, |
| 576 | u.tk_wait.list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | task->tk_status = status; |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 578 | rpc_wake_up_task_queue_locked(queue, task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | } |
| 580 | if (head == &queue->tasks[0]) |
| 581 | break; |
| 582 | head--; |
| 583 | } |
Trond Myklebust | 5e4424a | 2008-02-25 21:53:49 -0800 | [diff] [blame] | 584 | spin_unlock_bh(&queue->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 586 | EXPORT_SYMBOL_GPL(rpc_wake_up_status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | |
Trond Myklebust | 36df9aa | 2007-07-18 16:18:52 -0400 | [diff] [blame] | 588 | static void __rpc_queue_timer_fn(unsigned long ptr) |
| 589 | { |
| 590 | struct rpc_wait_queue *queue = (struct rpc_wait_queue *)ptr; |
| 591 | struct rpc_task *task, *n; |
| 592 | unsigned long expires, now, timeo; |
| 593 | |
| 594 | spin_lock(&queue->lock); |
| 595 | expires = now = jiffies; |
| 596 | list_for_each_entry_safe(task, n, &queue->timer_list.list, u.tk_wait.timer_list) { |
| 597 | timeo = task->u.tk_wait.expires; |
| 598 | if (time_after_eq(now, timeo)) { |
Trond Myklebust | 36df9aa | 2007-07-18 16:18:52 -0400 | [diff] [blame] | 599 | dprintk("RPC: %5u timeout\n", task->tk_pid); |
| 600 | task->tk_status = -ETIMEDOUT; |
| 601 | rpc_wake_up_task_queue_locked(queue, task); |
| 602 | continue; |
| 603 | } |
| 604 | if (expires == now || time_after(expires, timeo)) |
| 605 | expires = timeo; |
| 606 | } |
| 607 | if (!list_empty(&queue->timer_list.list)) |
| 608 | rpc_set_queue_timer(queue, expires); |
| 609 | spin_unlock(&queue->lock); |
| 610 | } |
| 611 | |
Trond Myklebust | 8014793 | 2006-08-31 18:24:08 -0400 | [diff] [blame] | 612 | static void __rpc_atrun(struct rpc_task *task) |
| 613 | { |
Trond Myklebust | 5d00837 | 2008-02-22 16:34:17 -0500 | [diff] [blame] | 614 | task->tk_status = 0; |
Trond Myklebust | 8014793 | 2006-08-31 18:24:08 -0400 | [diff] [blame] | 615 | } |
| 616 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | /* |
| 618 | * Run a task at a later time |
| 619 | */ |
Trond Myklebust | 8014793 | 2006-08-31 18:24:08 -0400 | [diff] [blame] | 620 | void rpc_delay(struct rpc_task *task, unsigned long delay) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | { |
| 622 | task->tk_timeout = delay; |
Trond Myklebust | 5d00837 | 2008-02-22 16:34:17 -0500 | [diff] [blame] | 623 | rpc_sleep_on(&delay_queue, task, __rpc_atrun); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 625 | EXPORT_SYMBOL_GPL(rpc_delay); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | /* |
Trond Myklebust | 4ce70ad | 2006-01-03 09:55:05 +0100 | [diff] [blame] | 628 | * Helper to call task->tk_ops->rpc_call_prepare |
| 629 | */ |
Andy Adamson | aae2006 | 2009-04-01 09:22:40 -0400 | [diff] [blame] | 630 | void rpc_prepare_task(struct rpc_task *task) |
Trond Myklebust | 4ce70ad | 2006-01-03 09:55:05 +0100 | [diff] [blame] | 631 | { |
| 632 | task->tk_ops->rpc_call_prepare(task, task->tk_calldata); |
| 633 | } |
| 634 | |
Trond Myklebust | 7fdcf13 | 2011-12-01 14:00:15 -0500 | [diff] [blame] | 635 | static void |
| 636 | rpc_init_task_statistics(struct rpc_task *task) |
| 637 | { |
| 638 | /* Initialize retry counters */ |
| 639 | task->tk_garb_retry = 2; |
| 640 | task->tk_cred_retry = 2; |
| 641 | task->tk_rebind_retry = 2; |
| 642 | |
| 643 | /* starting timestamp */ |
| 644 | task->tk_start = ktime_get(); |
| 645 | } |
| 646 | |
| 647 | static void |
| 648 | rpc_reset_task_statistics(struct rpc_task *task) |
| 649 | { |
| 650 | task->tk_timeouts = 0; |
| 651 | task->tk_flags &= ~(RPC_CALL_MAJORSEEN|RPC_TASK_KILLED|RPC_TASK_SENT); |
| 652 | |
| 653 | rpc_init_task_statistics(task); |
| 654 | } |
| 655 | |
Trond Myklebust | 4ce70ad | 2006-01-03 09:55:05 +0100 | [diff] [blame] | 656 | /* |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 657 | * Helper that calls task->tk_ops->rpc_call_done if it exists |
Trond Myklebust | d05fdb0 | 2005-06-22 17:16:19 +0000 | [diff] [blame] | 658 | */ |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 659 | void rpc_exit_task(struct rpc_task *task) |
Trond Myklebust | d05fdb0 | 2005-06-22 17:16:19 +0000 | [diff] [blame] | 660 | { |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 661 | task->tk_action = NULL; |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 662 | if (task->tk_ops->rpc_call_done != NULL) { |
| 663 | task->tk_ops->rpc_call_done(task, task->tk_calldata); |
Trond Myklebust | d05fdb0 | 2005-06-22 17:16:19 +0000 | [diff] [blame] | 664 | if (task->tk_action != NULL) { |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 665 | WARN_ON(RPC_ASSASSINATED(task)); |
| 666 | /* Always release the RPC slot and buffer memory */ |
| 667 | xprt_release(task); |
Trond Myklebust | 7fdcf13 | 2011-12-01 14:00:15 -0500 | [diff] [blame] | 668 | rpc_reset_task_statistics(task); |
Trond Myklebust | d05fdb0 | 2005-06-22 17:16:19 +0000 | [diff] [blame] | 669 | } |
| 670 | } |
Trond Myklebust | d05fdb0 | 2005-06-22 17:16:19 +0000 | [diff] [blame] | 671 | } |
Trond Myklebust | d9b6cd9 | 2010-07-31 14:29:08 -0400 | [diff] [blame] | 672 | |
| 673 | void rpc_exit(struct rpc_task *task, int status) |
| 674 | { |
| 675 | task->tk_status = status; |
| 676 | task->tk_action = rpc_exit_task; |
| 677 | if (RPC_IS_QUEUED(task)) |
| 678 | rpc_wake_up_queued_task(task->tk_waitqueue, task); |
| 679 | } |
| 680 | EXPORT_SYMBOL_GPL(rpc_exit); |
Trond Myklebust | d05fdb0 | 2005-06-22 17:16:19 +0000 | [diff] [blame] | 681 | |
Trond Myklebust | bbd5a1f | 2006-10-18 16:01:05 -0400 | [diff] [blame] | 682 | void rpc_release_calldata(const struct rpc_call_ops *ops, void *calldata) |
| 683 | { |
Trond Myklebust | a86dc49 | 2008-06-11 13:37:09 -0400 | [diff] [blame] | 684 | if (ops->rpc_release != NULL) |
Trond Myklebust | bbd5a1f | 2006-10-18 16:01:05 -0400 | [diff] [blame] | 685 | ops->rpc_release(calldata); |
Trond Myklebust | bbd5a1f | 2006-10-18 16:01:05 -0400 | [diff] [blame] | 686 | } |
| 687 | |
Trond Myklebust | d05fdb0 | 2005-06-22 17:16:19 +0000 | [diff] [blame] | 688 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | * This is the RPC `scheduler' (or rather, the finite state machine). |
| 690 | */ |
Trond Myklebust | 2efef83 | 2007-02-03 13:38:41 -0800 | [diff] [blame] | 691 | static void __rpc_execute(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | { |
Trond Myklebust | eb9b55a | 2009-03-10 20:33:16 -0400 | [diff] [blame] | 693 | struct rpc_wait_queue *queue; |
| 694 | int task_is_async = RPC_IS_ASYNC(task); |
| 695 | int status = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 697 | dprintk("RPC: %5u __rpc_execute flags=0x%x\n", |
| 698 | task->tk_pid, task->tk_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | |
| 700 | BUG_ON(RPC_IS_QUEUED(task)); |
| 701 | |
Trond Myklebust | d05fdb0 | 2005-06-22 17:16:19 +0000 | [diff] [blame] | 702 | for (;;) { |
Trond Myklebust | b55c598 | 2011-07-06 19:58:23 -0400 | [diff] [blame] | 703 | void (*do_action)(struct rpc_task *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | |
| 705 | /* |
Trond Myklebust | b55c598 | 2011-07-06 19:58:23 -0400 | [diff] [blame] | 706 | * Execute any pending callback first. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | */ |
Trond Myklebust | b55c598 | 2011-07-06 19:58:23 -0400 | [diff] [blame] | 708 | do_action = task->tk_callback; |
| 709 | task->tk_callback = NULL; |
| 710 | if (do_action == NULL) { |
Trond Myklebust | e020c68 | 2011-03-15 19:56:30 -0400 | [diff] [blame] | 711 | /* |
| 712 | * Perform the next FSM step. |
Trond Myklebust | b55c598 | 2011-07-06 19:58:23 -0400 | [diff] [blame] | 713 | * tk_action may be NULL if the task has been killed. |
| 714 | * In particular, note that rpc_killall_tasks may |
| 715 | * do this at any time, so beware when dereferencing. |
Trond Myklebust | e020c68 | 2011-03-15 19:56:30 -0400 | [diff] [blame] | 716 | */ |
Trond Myklebust | b55c598 | 2011-07-06 19:58:23 -0400 | [diff] [blame] | 717 | do_action = task->tk_action; |
| 718 | if (do_action == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | } |
Trond Myklebust | 82b0a4c | 2012-01-20 14:52:23 -0500 | [diff] [blame] | 721 | trace_rpc_task_run_action(task->tk_client, task, task->tk_action); |
Trond Myklebust | b55c598 | 2011-07-06 19:58:23 -0400 | [diff] [blame] | 722 | do_action(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | |
| 724 | /* |
| 725 | * Lockless check for whether task is sleeping or not. |
| 726 | */ |
| 727 | if (!RPC_IS_QUEUED(task)) |
| 728 | continue; |
Trond Myklebust | eb9b55a | 2009-03-10 20:33:16 -0400 | [diff] [blame] | 729 | /* |
| 730 | * The queue->lock protects against races with |
| 731 | * rpc_make_runnable(). |
| 732 | * |
| 733 | * Note that once we clear RPC_TASK_RUNNING on an asynchronous |
| 734 | * rpc_task, rpc_make_runnable() can assign it to a |
| 735 | * different workqueue. We therefore cannot assume that the |
| 736 | * rpc_task pointer may still be dereferenced. |
| 737 | */ |
| 738 | queue = task->tk_waitqueue; |
| 739 | spin_lock_bh(&queue->lock); |
| 740 | if (!RPC_IS_QUEUED(task)) { |
| 741 | spin_unlock_bh(&queue->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | continue; |
| 743 | } |
Trond Myklebust | eb9b55a | 2009-03-10 20:33:16 -0400 | [diff] [blame] | 744 | rpc_clear_running(task); |
| 745 | spin_unlock_bh(&queue->lock); |
| 746 | if (task_is_async) |
| 747 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | |
| 749 | /* sync task: sleep here */ |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 750 | dprintk("RPC: %5u sync task going to sleep\n", task->tk_pid); |
Trond Myklebust | 96651ab | 2005-06-22 17:16:21 +0000 | [diff] [blame] | 751 | status = out_of_line_wait_on_bit(&task->tk_runstate, |
Matthew Wilcox | 150030b | 2007-12-06 16:24:39 -0500 | [diff] [blame] | 752 | RPC_TASK_QUEUED, rpc_wait_bit_killable, |
| 753 | TASK_KILLABLE); |
Trond Myklebust | 96651ab | 2005-06-22 17:16:21 +0000 | [diff] [blame] | 754 | if (status == -ERESTARTSYS) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 755 | /* |
| 756 | * When a sync task receives a signal, it exits with |
| 757 | * -ERESTARTSYS. In order to catch any callbacks that |
| 758 | * clean up after sleeping on some queue, we don't |
| 759 | * break the loop here, but go around once more. |
| 760 | */ |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 761 | dprintk("RPC: %5u got signal\n", task->tk_pid); |
Trond Myklebust | 96651ab | 2005-06-22 17:16:21 +0000 | [diff] [blame] | 762 | task->tk_flags |= RPC_TASK_KILLED; |
| 763 | rpc_exit(task, -ERESTARTSYS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | } |
| 765 | rpc_set_running(task); |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 766 | dprintk("RPC: %5u sync task resuming\n", task->tk_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 767 | } |
| 768 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 769 | dprintk("RPC: %5u return %d, status %d\n", task->tk_pid, status, |
| 770 | task->tk_status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | /* Release all resources associated with the task */ |
| 772 | rpc_release_task(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | } |
| 774 | |
| 775 | /* |
| 776 | * User-visible entry point to the scheduler. |
| 777 | * |
| 778 | * This may be called recursively if e.g. an async NFS task updates |
| 779 | * the attributes and finds that dirty pages must be flushed. |
| 780 | * NOTE: Upon exit of this function the task is guaranteed to be |
| 781 | * released. In particular note that tk_release() will have |
| 782 | * been called, so your task memory may have been freed. |
| 783 | */ |
Trond Myklebust | 2efef83 | 2007-02-03 13:38:41 -0800 | [diff] [blame] | 784 | void rpc_execute(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | { |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 786 | rpc_set_active(task); |
Trond Myklebust | d6a1ed0 | 2010-07-31 14:29:08 -0400 | [diff] [blame] | 787 | rpc_make_runnable(task); |
| 788 | if (!RPC_IS_ASYNC(task)) |
| 789 | __rpc_execute(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | } |
| 791 | |
David Howells | 65f27f3 | 2006-11-22 14:55:48 +0000 | [diff] [blame] | 792 | static void rpc_async_schedule(struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | { |
Jeff Layton | 5cf02d0 | 2012-07-23 13:58:51 -0400 | [diff] [blame] | 794 | current->flags |= PF_FSTRANS; |
David Howells | 65f27f3 | 2006-11-22 14:55:48 +0000 | [diff] [blame] | 795 | __rpc_execute(container_of(work, struct rpc_task, u.tk_work)); |
Jeff Layton | 5cf02d0 | 2012-07-23 13:58:51 -0400 | [diff] [blame] | 796 | current->flags &= ~PF_FSTRANS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | } |
| 798 | |
Chuck Lever | 0210714 | 2006-01-03 09:55:49 +0100 | [diff] [blame] | 799 | /** |
| 800 | * rpc_malloc - allocate an RPC buffer |
| 801 | * @task: RPC task that will use this buffer |
| 802 | * @size: requested byte size |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | * |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 804 | * To prevent rpciod from hanging, this allocator never sleeps, |
| 805 | * returning NULL if the request cannot be serviced immediately. |
| 806 | * The caller can arrange to sleep in a way that is safe for rpciod. |
| 807 | * |
| 808 | * Most requests are 'small' (under 2KiB) and can be serviced from a |
| 809 | * mempool, ensuring that NFS reads and writes can always proceed, |
| 810 | * and that there is good locality of reference for these buffers. |
| 811 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | * In order to avoid memory starvation triggering more writebacks of |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 813 | * NFS requests, we avoid using GFP_KERNEL. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 814 | */ |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 815 | void *rpc_malloc(struct rpc_task *task, size_t size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 816 | { |
Chuck Lever | aa3d1fa | 2007-05-08 18:23:28 -0400 | [diff] [blame] | 817 | struct rpc_buffer *buf; |
Mel Gorman | a564b8f | 2012-07-31 16:45:12 -0700 | [diff] [blame] | 818 | gfp_t gfp = GFP_NOWAIT; |
| 819 | |
| 820 | if (RPC_IS_SWAPPER(task)) |
| 821 | gfp |= __GFP_MEMALLOC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | |
Chuck Lever | aa3d1fa | 2007-05-08 18:23:28 -0400 | [diff] [blame] | 823 | size += sizeof(struct rpc_buffer); |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 824 | if (size <= RPC_BUFFER_MAXSIZE) |
| 825 | buf = mempool_alloc(rpc_buffer_mempool, gfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 826 | else |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 827 | buf = kmalloc(size, gfp); |
Peter Zijlstra | ddce40d | 2007-05-09 08:30:11 +0200 | [diff] [blame] | 828 | |
| 829 | if (!buf) |
| 830 | return NULL; |
| 831 | |
Chuck Lever | aa3d1fa | 2007-05-08 18:23:28 -0400 | [diff] [blame] | 832 | buf->len = size; |
Geert Uytterhoeven | 215d067 | 2007-05-08 11:37:26 +0200 | [diff] [blame] | 833 | dprintk("RPC: %5u allocated buffer of size %zu at %p\n", |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 834 | task->tk_pid, size, buf); |
Chuck Lever | aa3d1fa | 2007-05-08 18:23:28 -0400 | [diff] [blame] | 835 | return &buf->data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 837 | EXPORT_SYMBOL_GPL(rpc_malloc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 838 | |
Chuck Lever | 0210714 | 2006-01-03 09:55:49 +0100 | [diff] [blame] | 839 | /** |
| 840 | * rpc_free - free buffer allocated via rpc_malloc |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 841 | * @buffer: buffer to free |
Chuck Lever | 0210714 | 2006-01-03 09:55:49 +0100 | [diff] [blame] | 842 | * |
| 843 | */ |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 844 | void rpc_free(void *buffer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | { |
Chuck Lever | aa3d1fa | 2007-05-08 18:23:28 -0400 | [diff] [blame] | 846 | size_t size; |
| 847 | struct rpc_buffer *buf; |
Chuck Lever | 0210714 | 2006-01-03 09:55:49 +0100 | [diff] [blame] | 848 | |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 849 | if (!buffer) |
| 850 | return; |
Chuck Lever | aa3d1fa | 2007-05-08 18:23:28 -0400 | [diff] [blame] | 851 | |
| 852 | buf = container_of(buffer, struct rpc_buffer, data); |
| 853 | size = buf->len; |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 854 | |
Geert Uytterhoeven | 215d067 | 2007-05-08 11:37:26 +0200 | [diff] [blame] | 855 | dprintk("RPC: freeing buffer of size %zu at %p\n", |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 856 | size, buf); |
Chuck Lever | aa3d1fa | 2007-05-08 18:23:28 -0400 | [diff] [blame] | 857 | |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 858 | if (size <= RPC_BUFFER_MAXSIZE) |
| 859 | mempool_free(buf, rpc_buffer_mempool); |
| 860 | else |
| 861 | kfree(buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 863 | EXPORT_SYMBOL_GPL(rpc_free); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | |
| 865 | /* |
| 866 | * Creation and deletion of RPC task structures |
| 867 | */ |
Trond Myklebust | 47fe064 | 2007-10-25 18:42:55 -0400 | [diff] [blame] | 868 | 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] | 869 | { |
| 870 | memset(task, 0, sizeof(*task)); |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 871 | atomic_set(&task->tk_count, 1); |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 872 | task->tk_flags = task_setup_data->flags; |
| 873 | task->tk_ops = task_setup_data->callback_ops; |
| 874 | task->tk_calldata = task_setup_data->callback_data; |
Trond Myklebust | 6529eba | 2007-06-14 16:40:14 -0400 | [diff] [blame] | 875 | INIT_LIST_HEAD(&task->tk_task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 876 | |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 877 | task->tk_priority = task_setup_data->priority - RPC_PRIORITY_LOW; |
| 878 | task->tk_owner = current->tgid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | |
| 880 | /* Initialize workqueue for async tasks */ |
Trond Myklebust | 32bfb5c | 2008-02-19 20:04:21 -0500 | [diff] [blame] | 881 | task->tk_workqueue = task_setup_data->workqueue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 883 | if (task->tk_ops->rpc_call_prepare != NULL) |
| 884 | task->tk_action = rpc_prepare_task; |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 885 | |
Trond Myklebust | 7fdcf13 | 2011-12-01 14:00:15 -0500 | [diff] [blame] | 886 | rpc_init_task_statistics(task); |
Chuck Lever | ef759a2 | 2006-03-20 13:44:17 -0500 | [diff] [blame] | 887 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 888 | dprintk("RPC: new task initialized, procpid %u\n", |
Pavel Emelyanov | ba25f9d | 2007-10-18 23:40:40 -0700 | [diff] [blame] | 889 | task_pid_nr(current)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 890 | } |
| 891 | |
| 892 | static struct rpc_task * |
| 893 | rpc_alloc_task(void) |
| 894 | { |
Mel Gorman | a564b8f | 2012-07-31 16:45:12 -0700 | [diff] [blame] | 895 | return (struct rpc_task *)mempool_alloc(rpc_task_mempool, GFP_NOIO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | } |
| 897 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | /* |
Trond Myklebust | 90c5755 | 2007-06-09 19:49:36 -0400 | [diff] [blame] | 899 | * Create a new task for the specified client. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | */ |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 901 | 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] | 902 | { |
Trond Myklebust | e8f5d77 | 2007-10-25 18:42:53 -0400 | [diff] [blame] | 903 | struct rpc_task *task = setup_data->task; |
| 904 | unsigned short flags = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 905 | |
Trond Myklebust | e8f5d77 | 2007-10-25 18:42:53 -0400 | [diff] [blame] | 906 | if (task == NULL) { |
| 907 | task = rpc_alloc_task(); |
Trond Myklebust | 19445b9 | 2010-04-16 16:41:10 -0400 | [diff] [blame] | 908 | if (task == NULL) { |
| 909 | rpc_release_calldata(setup_data->callback_ops, |
| 910 | setup_data->callback_data); |
| 911 | return ERR_PTR(-ENOMEM); |
| 912 | } |
Trond Myklebust | e8f5d77 | 2007-10-25 18:42:53 -0400 | [diff] [blame] | 913 | flags = RPC_TASK_DYNAMIC; |
| 914 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 915 | |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 916 | rpc_init_task(task, setup_data); |
Trond Myklebust | e8f5d77 | 2007-10-25 18:42:53 -0400 | [diff] [blame] | 917 | task->tk_flags |= flags; |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 918 | dprintk("RPC: allocated task %p\n", task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | return task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 920 | } |
| 921 | |
Trond Myklebust | 32bfb5c | 2008-02-19 20:04:21 -0500 | [diff] [blame] | 922 | static void rpc_free_task(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 923 | { |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 924 | const struct rpc_call_ops *tk_ops = task->tk_ops; |
| 925 | void *calldata = task->tk_calldata; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 926 | |
Trond Myklebust | 5e4424a | 2008-02-25 21:53:49 -0800 | [diff] [blame] | 927 | if (task->tk_flags & RPC_TASK_DYNAMIC) { |
| 928 | dprintk("RPC: %5u freeing task\n", task->tk_pid); |
| 929 | mempool_free(task, rpc_task_mempool); |
| 930 | } |
Trond Myklebust | 32bfb5c | 2008-02-19 20:04:21 -0500 | [diff] [blame] | 931 | rpc_release_calldata(tk_ops, calldata); |
| 932 | } |
| 933 | |
| 934 | static void rpc_async_release(struct work_struct *work) |
| 935 | { |
| 936 | rpc_free_task(container_of(work, struct rpc_task, u.tk_work)); |
| 937 | } |
| 938 | |
Trond Myklebust | bf294b4 | 2011-02-21 11:05:41 -0800 | [diff] [blame] | 939 | static void rpc_release_resources_task(struct rpc_task *task) |
Trond Myklebust | 32bfb5c | 2008-02-19 20:04:21 -0500 | [diff] [blame] | 940 | { |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 941 | if (task->tk_rqstp) |
| 942 | xprt_release(task); |
OGAWA Hirofumi | a271c5a | 2011-03-27 17:48:57 +0200 | [diff] [blame] | 943 | if (task->tk_msg.rpc_cred) { |
Trond Myklebust | a17c215 | 2010-07-31 14:29:08 -0400 | [diff] [blame] | 944 | put_rpccred(task->tk_msg.rpc_cred); |
OGAWA Hirofumi | a271c5a | 2011-03-27 17:48:57 +0200 | [diff] [blame] | 945 | task->tk_msg.rpc_cred = NULL; |
| 946 | } |
Trond Myklebust | 58f9612 | 2010-07-31 14:29:08 -0400 | [diff] [blame] | 947 | rpc_task_release_client(task); |
Trond Myklebust | bf294b4 | 2011-02-21 11:05:41 -0800 | [diff] [blame] | 948 | } |
| 949 | |
| 950 | static void rpc_final_put_task(struct rpc_task *task, |
| 951 | struct workqueue_struct *q) |
| 952 | { |
| 953 | if (q != NULL) { |
Trond Myklebust | 32bfb5c | 2008-02-19 20:04:21 -0500 | [diff] [blame] | 954 | INIT_WORK(&task->u.tk_work, rpc_async_release); |
Trond Myklebust | bf294b4 | 2011-02-21 11:05:41 -0800 | [diff] [blame] | 955 | queue_work(q, &task->u.tk_work); |
Trond Myklebust | 32bfb5c | 2008-02-19 20:04:21 -0500 | [diff] [blame] | 956 | } else |
| 957 | rpc_free_task(task); |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 958 | } |
Trond Myklebust | bf294b4 | 2011-02-21 11:05:41 -0800 | [diff] [blame] | 959 | |
| 960 | static void rpc_do_put_task(struct rpc_task *task, struct workqueue_struct *q) |
| 961 | { |
| 962 | if (atomic_dec_and_test(&task->tk_count)) { |
| 963 | rpc_release_resources_task(task); |
| 964 | rpc_final_put_task(task, q); |
| 965 | } |
| 966 | } |
| 967 | |
| 968 | void rpc_put_task(struct rpc_task *task) |
| 969 | { |
| 970 | rpc_do_put_task(task, NULL); |
| 971 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 972 | EXPORT_SYMBOL_GPL(rpc_put_task); |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 973 | |
Trond Myklebust | bf294b4 | 2011-02-21 11:05:41 -0800 | [diff] [blame] | 974 | void rpc_put_task_async(struct rpc_task *task) |
| 975 | { |
| 976 | rpc_do_put_task(task, task->tk_workqueue); |
| 977 | } |
| 978 | EXPORT_SYMBOL_GPL(rpc_put_task_async); |
| 979 | |
Trond Myklebust | bde8f00 | 2007-01-24 11:54:53 -0800 | [diff] [blame] | 980 | static void rpc_release_task(struct rpc_task *task) |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 981 | { |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 982 | dprintk("RPC: %5u release task\n", task->tk_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 983 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | BUG_ON (RPC_IS_QUEUED(task)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 985 | |
Trond Myklebust | bf294b4 | 2011-02-21 11:05:41 -0800 | [diff] [blame] | 986 | rpc_release_resources_task(task); |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 987 | |
Trond Myklebust | bf294b4 | 2011-02-21 11:05:41 -0800 | [diff] [blame] | 988 | /* |
| 989 | * Note: at this point we have been removed from rpc_clnt->cl_tasks, |
| 990 | * so it should be safe to use task->tk_count as a test for whether |
| 991 | * or not any other processes still hold references to our rpc_task. |
| 992 | */ |
| 993 | if (atomic_read(&task->tk_count) != 1 + !RPC_IS_ASYNC(task)) { |
| 994 | /* Wake up anyone who may be waiting for task completion */ |
| 995 | if (!rpc_complete_task(task)) |
| 996 | return; |
| 997 | } else { |
| 998 | if (!atomic_dec_and_test(&task->tk_count)) |
| 999 | return; |
| 1000 | } |
| 1001 | rpc_final_put_task(task, task->tk_workqueue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1002 | } |
| 1003 | |
Trond Myklebust | b247bbf | 2007-07-19 16:32:20 -0400 | [diff] [blame] | 1004 | int rpciod_up(void) |
| 1005 | { |
| 1006 | return try_module_get(THIS_MODULE) ? 0 : -EINVAL; |
| 1007 | } |
| 1008 | |
| 1009 | void rpciod_down(void) |
| 1010 | { |
| 1011 | module_put(THIS_MODULE); |
| 1012 | } |
| 1013 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1014 | /* |
Trond Myklebust | b247bbf | 2007-07-19 16:32:20 -0400 | [diff] [blame] | 1015 | * Start up the rpciod workqueue. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1016 | */ |
Trond Myklebust | b247bbf | 2007-07-19 16:32:20 -0400 | [diff] [blame] | 1017 | static int rpciod_start(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1018 | { |
| 1019 | struct workqueue_struct *wq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1020 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1021 | /* |
| 1022 | * Create the rpciod thread and wait for it to start. |
| 1023 | */ |
Trond Myklebust | ab418d7 | 2007-06-14 17:08:36 -0400 | [diff] [blame] | 1024 | dprintk("RPC: creating workqueue rpciod\n"); |
Tejun Heo | ada609e | 2011-01-25 14:35:54 +0100 | [diff] [blame] | 1025 | wq = alloc_workqueue("rpciod", WQ_MEM_RECLAIM, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1026 | rpciod_workqueue = wq; |
Trond Myklebust | b247bbf | 2007-07-19 16:32:20 -0400 | [diff] [blame] | 1027 | return rpciod_workqueue != NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1028 | } |
| 1029 | |
Trond Myklebust | b247bbf | 2007-07-19 16:32:20 -0400 | [diff] [blame] | 1030 | static void rpciod_stop(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1031 | { |
Trond Myklebust | b247bbf | 2007-07-19 16:32:20 -0400 | [diff] [blame] | 1032 | struct workqueue_struct *wq = NULL; |
Trond Myklebust | ab418d7 | 2007-06-14 17:08:36 -0400 | [diff] [blame] | 1033 | |
Trond Myklebust | b247bbf | 2007-07-19 16:32:20 -0400 | [diff] [blame] | 1034 | if (rpciod_workqueue == NULL) |
| 1035 | return; |
Trond Myklebust | ab418d7 | 2007-06-14 17:08:36 -0400 | [diff] [blame] | 1036 | dprintk("RPC: destroying workqueue rpciod\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1037 | |
Trond Myklebust | b247bbf | 2007-07-19 16:32:20 -0400 | [diff] [blame] | 1038 | wq = rpciod_workqueue; |
| 1039 | rpciod_workqueue = NULL; |
| 1040 | destroy_workqueue(wq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1041 | } |
| 1042 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1043 | void |
| 1044 | rpc_destroy_mempool(void) |
| 1045 | { |
Trond Myklebust | b247bbf | 2007-07-19 16:32:20 -0400 | [diff] [blame] | 1046 | rpciod_stop(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1047 | if (rpc_buffer_mempool) |
| 1048 | mempool_destroy(rpc_buffer_mempool); |
| 1049 | if (rpc_task_mempool) |
| 1050 | mempool_destroy(rpc_task_mempool); |
Alexey Dobriyan | 1a1d92c | 2006-09-27 01:49:40 -0700 | [diff] [blame] | 1051 | if (rpc_task_slabp) |
| 1052 | kmem_cache_destroy(rpc_task_slabp); |
| 1053 | if (rpc_buffer_slabp) |
| 1054 | kmem_cache_destroy(rpc_buffer_slabp); |
Trond Myklebust | f6a1cc8 | 2008-02-22 17:06:55 -0500 | [diff] [blame] | 1055 | rpc_destroy_wait_queue(&delay_queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1056 | } |
| 1057 | |
| 1058 | int |
| 1059 | rpc_init_mempool(void) |
| 1060 | { |
Trond Myklebust | f6a1cc8 | 2008-02-22 17:06:55 -0500 | [diff] [blame] | 1061 | /* |
| 1062 | * The following is not strictly a mempool initialisation, |
| 1063 | * but there is no harm in doing it here |
| 1064 | */ |
| 1065 | rpc_init_wait_queue(&delay_queue, "delayq"); |
| 1066 | if (!rpciod_start()) |
| 1067 | goto err_nomem; |
| 1068 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1069 | rpc_task_slabp = kmem_cache_create("rpc_tasks", |
| 1070 | sizeof(struct rpc_task), |
| 1071 | 0, SLAB_HWCACHE_ALIGN, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 1072 | NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1073 | if (!rpc_task_slabp) |
| 1074 | goto err_nomem; |
| 1075 | rpc_buffer_slabp = kmem_cache_create("rpc_buffers", |
| 1076 | RPC_BUFFER_MAXSIZE, |
| 1077 | 0, SLAB_HWCACHE_ALIGN, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 1078 | NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1079 | if (!rpc_buffer_slabp) |
| 1080 | goto err_nomem; |
Matthew Dobson | 93d2341 | 2006-03-26 01:37:50 -0800 | [diff] [blame] | 1081 | rpc_task_mempool = mempool_create_slab_pool(RPC_TASK_POOLSIZE, |
| 1082 | rpc_task_slabp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1083 | if (!rpc_task_mempool) |
| 1084 | goto err_nomem; |
Matthew Dobson | 93d2341 | 2006-03-26 01:37:50 -0800 | [diff] [blame] | 1085 | rpc_buffer_mempool = mempool_create_slab_pool(RPC_BUFFER_POOLSIZE, |
| 1086 | rpc_buffer_slabp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1087 | if (!rpc_buffer_mempool) |
| 1088 | goto err_nomem; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1089 | return 0; |
| 1090 | err_nomem: |
| 1091 | rpc_destroy_mempool(); |
| 1092 | return -ENOMEM; |
| 1093 | } |