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 | |
Jeff Layton | f895b25 | 2014-11-17 16:58:04 -0500 | [diff] [blame] | 27 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | 40a5f1b | 2016-05-27 10:39:50 -0400 | [diff] [blame] | 57 | struct workqueue_struct *rpciod_workqueue __read_mostly; |
| 58 | struct workqueue_struct *xprtiod_workqueue __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | |
| 60 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | * Disable the timer for a given RPC task. Should be called with |
| 62 | * queue->lock and bh_disabled in order to avoid races within |
| 63 | * rpc_run_timer(). |
| 64 | */ |
Trond Myklebust | 5d00837 | 2008-02-22 16:34:17 -0500 | [diff] [blame] | 65 | static void |
Trond Myklebust | eb276c0 | 2008-02-22 17:27:59 -0500 | [diff] [blame] | 66 | __rpc_disable_timer(struct rpc_wait_queue *queue, struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | { |
Trond Myklebust | 36df9aa | 2007-07-18 16:18:52 -0400 | [diff] [blame] | 68 | if (task->tk_timeout == 0) |
| 69 | return; |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 70 | dprintk("RPC: %5u disabling timer\n", task->tk_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | task->tk_timeout = 0; |
Trond Myklebust | 36df9aa | 2007-07-18 16:18:52 -0400 | [diff] [blame] | 72 | list_del(&task->u.tk_wait.timer_list); |
Trond Myklebust | eb276c0 | 2008-02-22 17:27:59 -0500 | [diff] [blame] | 73 | if (list_empty(&queue->timer_list.list)) |
| 74 | del_timer(&queue->timer_list.timer); |
Trond Myklebust | 36df9aa | 2007-07-18 16:18:52 -0400 | [diff] [blame] | 75 | } |
| 76 | |
| 77 | static void |
| 78 | rpc_set_queue_timer(struct rpc_wait_queue *queue, unsigned long expires) |
| 79 | { |
| 80 | queue->timer_list.expires = expires; |
| 81 | mod_timer(&queue->timer_list.timer, expires); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | } |
| 83 | |
| 84 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | * Set up a timer for the current task. |
| 86 | */ |
Trond Myklebust | 5d00837 | 2008-02-22 16:34:17 -0500 | [diff] [blame] | 87 | static void |
Trond Myklebust | eb276c0 | 2008-02-22 17:27:59 -0500 | [diff] [blame] | 88 | __rpc_add_timer(struct rpc_wait_queue *queue, struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | { |
| 90 | if (!task->tk_timeout) |
| 91 | return; |
| 92 | |
Nicholas Mc Guire | 55cc1d7 | 2015-03-13 04:25:34 -0400 | [diff] [blame] | 93 | dprintk("RPC: %5u setting alarm for %u ms\n", |
| 94 | task->tk_pid, jiffies_to_msecs(task->tk_timeout)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | |
Trond Myklebust | eb276c0 | 2008-02-22 17:27:59 -0500 | [diff] [blame] | 96 | task->u.tk_wait.expires = jiffies + task->tk_timeout; |
| 97 | if (list_empty(&queue->timer_list.list) || time_before(task->u.tk_wait.expires, queue->timer_list.expires)) |
| 98 | rpc_set_queue_timer(queue, task->u.tk_wait.expires); |
| 99 | list_add(&task->u.tk_wait.timer_list, &queue->timer_list.list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | } |
| 101 | |
Trond Myklebust | c05eecf | 2012-11-30 23:59:29 -0500 | [diff] [blame] | 102 | static void rpc_set_waitqueue_priority(struct rpc_wait_queue *queue, int priority) |
| 103 | { |
Trond Myklebust | edd2e36 | 2013-01-27 14:20:49 -0500 | [diff] [blame] | 104 | if (queue->priority != priority) { |
Trond Myklebust | edd2e36 | 2013-01-27 14:20:49 -0500 | [diff] [blame] | 105 | queue->priority = priority; |
Trond Myklebust | 3d82780 | 2018-09-08 22:09:48 -0400 | [diff] [blame] | 106 | queue->nr = 1U << priority; |
Trond Myklebust | edd2e36 | 2013-01-27 14:20:49 -0500 | [diff] [blame] | 107 | } |
Trond Myklebust | c05eecf | 2012-11-30 23:59:29 -0500 | [diff] [blame] | 108 | } |
| 109 | |
Trond Myklebust | c05eecf | 2012-11-30 23:59:29 -0500 | [diff] [blame] | 110 | static void rpc_reset_waitqueue_priority(struct rpc_wait_queue *queue) |
| 111 | { |
| 112 | rpc_set_waitqueue_priority(queue, queue->maxpriority); |
Trond Myklebust | 3d82780 | 2018-09-08 22:09:48 -0400 | [diff] [blame] | 113 | } |
| 114 | |
| 115 | /* |
| 116 | * Add a request to a queue list |
| 117 | */ |
| 118 | static void |
| 119 | __rpc_list_enqueue_task(struct list_head *q, struct rpc_task *task) |
| 120 | { |
| 121 | struct rpc_task *t; |
| 122 | |
| 123 | list_for_each_entry(t, q, u.tk_wait.list) { |
| 124 | if (t->tk_owner == task->tk_owner) { |
| 125 | list_add_tail(&task->u.tk_wait.links, |
| 126 | &t->u.tk_wait.links); |
| 127 | /* Cache the queue head in task->u.tk_wait.list */ |
| 128 | task->u.tk_wait.list.next = q; |
| 129 | task->u.tk_wait.list.prev = NULL; |
| 130 | return; |
| 131 | } |
| 132 | } |
| 133 | INIT_LIST_HEAD(&task->u.tk_wait.links); |
| 134 | list_add_tail(&task->u.tk_wait.list, q); |
| 135 | } |
| 136 | |
| 137 | /* |
| 138 | * Remove request from a queue list |
| 139 | */ |
| 140 | static void |
| 141 | __rpc_list_dequeue_task(struct rpc_task *task) |
| 142 | { |
| 143 | struct list_head *q; |
| 144 | struct rpc_task *t; |
| 145 | |
| 146 | if (task->u.tk_wait.list.prev == NULL) { |
| 147 | list_del(&task->u.tk_wait.links); |
| 148 | return; |
| 149 | } |
| 150 | if (!list_empty(&task->u.tk_wait.links)) { |
| 151 | t = list_first_entry(&task->u.tk_wait.links, |
| 152 | struct rpc_task, |
| 153 | u.tk_wait.links); |
| 154 | /* Assume __rpc_list_enqueue_task() cached the queue head */ |
| 155 | q = t->u.tk_wait.list.next; |
| 156 | list_add_tail(&t->u.tk_wait.list, q); |
| 157 | list_del(&task->u.tk_wait.links); |
| 158 | } |
| 159 | list_del(&task->u.tk_wait.list); |
Trond Myklebust | c05eecf | 2012-11-30 23:59:29 -0500 | [diff] [blame] | 160 | } |
| 161 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | /* |
| 163 | * Add new request to a priority queue. |
| 164 | */ |
Trond Myklebust | 3b27bad | 2011-07-17 18:11:34 -0400 | [diff] [blame] | 165 | static void __rpc_add_wait_queue_priority(struct rpc_wait_queue *queue, |
| 166 | struct rpc_task *task, |
| 167 | unsigned char queue_priority) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | { |
Trond Myklebust | 3b27bad | 2011-07-17 18:11:34 -0400 | [diff] [blame] | 169 | if (unlikely(queue_priority > queue->maxpriority)) |
Trond Myklebust | c05eecf | 2012-11-30 23:59:29 -0500 | [diff] [blame] | 170 | queue_priority = queue->maxpriority; |
Trond Myklebust | 3d82780 | 2018-09-08 22:09:48 -0400 | [diff] [blame] | 171 | __rpc_list_enqueue_task(&queue->tasks[queue_priority], task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | } |
| 173 | |
| 174 | /* |
| 175 | * Add new request to wait queue. |
| 176 | * |
| 177 | * Swapper tasks always get inserted at the head of the queue. |
| 178 | * This should avoid many nasty memory deadlocks and hopefully |
| 179 | * improve overall performance. |
| 180 | * Everyone else gets appended to the queue to ensure proper FIFO behavior. |
| 181 | */ |
Trond Myklebust | 3b27bad | 2011-07-17 18:11:34 -0400 | [diff] [blame] | 182 | static void __rpc_add_wait_queue(struct rpc_wait_queue *queue, |
| 183 | struct rpc_task *task, |
| 184 | unsigned char queue_priority) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | { |
Weston Andros Adamson | 2bd4eef | 2012-10-23 10:43:47 -0400 | [diff] [blame] | 186 | WARN_ON_ONCE(RPC_IS_QUEUED(task)); |
| 187 | if (RPC_IS_QUEUED(task)) |
| 188 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | |
| 190 | if (RPC_IS_PRIORITY(queue)) |
Trond Myklebust | 3b27bad | 2011-07-17 18:11:34 -0400 | [diff] [blame] | 191 | __rpc_add_wait_queue_priority(queue, task, queue_priority); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | else if (RPC_IS_SWAPPER(task)) |
| 193 | list_add(&task->u.tk_wait.list, &queue->tasks[0]); |
| 194 | else |
| 195 | list_add_tail(&task->u.tk_wait.list, &queue->tasks[0]); |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 196 | task->tk_waitqueue = queue; |
Chuck Lever | e19b63d | 2006-03-20 13:44:15 -0500 | [diff] [blame] | 197 | queue->qlen++; |
Trond Myklebust | 1166fde6 | 2013-03-25 11:23:40 -0400 | [diff] [blame] | 198 | /* barrier matches the read in rpc_wake_up_task_queue_locked() */ |
| 199 | smp_wmb(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | rpc_set_queued(task); |
| 201 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 202 | dprintk("RPC: %5u added to queue %p \"%s\"\n", |
| 203 | task->tk_pid, queue, rpc_qname(queue)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | } |
| 205 | |
| 206 | /* |
| 207 | * Remove request from a priority queue. |
| 208 | */ |
| 209 | static void __rpc_remove_wait_queue_priority(struct rpc_task *task) |
| 210 | { |
Trond Myklebust | 3d82780 | 2018-09-08 22:09:48 -0400 | [diff] [blame] | 211 | __rpc_list_dequeue_task(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | } |
| 213 | |
| 214 | /* |
| 215 | * Remove request from queue. |
| 216 | * Note: must be called with spin lock held. |
| 217 | */ |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 218 | 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] | 219 | { |
Trond Myklebust | eb276c0 | 2008-02-22 17:27:59 -0500 | [diff] [blame] | 220 | __rpc_disable_timer(queue, task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | if (RPC_IS_PRIORITY(queue)) |
| 222 | __rpc_remove_wait_queue_priority(task); |
Trond Myklebust | 3d82780 | 2018-09-08 22:09:48 -0400 | [diff] [blame] | 223 | else |
| 224 | list_del(&task->u.tk_wait.list); |
Chuck Lever | e19b63d | 2006-03-20 13:44:15 -0500 | [diff] [blame] | 225 | queue->qlen--; |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 226 | dprintk("RPC: %5u removed from queue %p \"%s\"\n", |
| 227 | task->tk_pid, queue, rpc_qname(queue)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | } |
| 229 | |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 230 | 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] | 231 | { |
| 232 | int i; |
| 233 | |
| 234 | spin_lock_init(&queue->lock); |
| 235 | for (i = 0; i < ARRAY_SIZE(queue->tasks); i++) |
| 236 | INIT_LIST_HEAD(&queue->tasks[i]); |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 237 | queue->maxpriority = nr_queues - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | rpc_reset_waitqueue_priority(queue); |
Trond Myklebust | 36df9aa | 2007-07-18 16:18:52 -0400 | [diff] [blame] | 239 | queue->qlen = 0; |
| 240 | setup_timer(&queue->timer_list.timer, __rpc_queue_timer_fn, (unsigned long)queue); |
| 241 | INIT_LIST_HEAD(&queue->timer_list.list); |
Trond Myklebust | 2f09c24 | 2012-02-08 22:01:15 -0500 | [diff] [blame] | 242 | rpc_assign_waitqueue_name(queue, qname); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | } |
| 244 | |
| 245 | void rpc_init_priority_wait_queue(struct rpc_wait_queue *queue, const char *qname) |
| 246 | { |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 247 | __rpc_init_priority_wait_queue(queue, qname, RPC_NR_PRIORITY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | } |
Alexandros Batsakis | 689cf5c | 2009-12-14 21:27:56 -0800 | [diff] [blame] | 249 | EXPORT_SYMBOL_GPL(rpc_init_priority_wait_queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | |
| 251 | void rpc_init_wait_queue(struct rpc_wait_queue *queue, const char *qname) |
| 252 | { |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 253 | __rpc_init_priority_wait_queue(queue, qname, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 255 | EXPORT_SYMBOL_GPL(rpc_init_wait_queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | |
Trond Myklebust | f6a1cc8 | 2008-02-22 17:06:55 -0500 | [diff] [blame] | 257 | void rpc_destroy_wait_queue(struct rpc_wait_queue *queue) |
| 258 | { |
Trond Myklebust | 36df9aa | 2007-07-18 16:18:52 -0400 | [diff] [blame] | 259 | del_timer_sync(&queue->timer_list.timer); |
Trond Myklebust | f6a1cc8 | 2008-02-22 17:06:55 -0500 | [diff] [blame] | 260 | } |
| 261 | EXPORT_SYMBOL_GPL(rpc_destroy_wait_queue); |
| 262 | |
Peter Zijlstra | dfd01f0 | 2015-12-13 22:11:16 +0100 | [diff] [blame] | 263 | static int rpc_wait_bit_killable(struct wait_bit_key *key, int mode) |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 264 | { |
Colin Cross | 416ad3c | 2013-05-06 23:50:06 +0000 | [diff] [blame] | 265 | freezable_schedule_unsafe(); |
Peter Zijlstra | dfd01f0 | 2015-12-13 22:11:16 +0100 | [diff] [blame] | 266 | if (signal_pending_state(mode, current)) |
| 267 | return -ERESTARTSYS; |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 268 | return 0; |
| 269 | } |
| 270 | |
Jeff Layton | 1306729 | 2014-11-17 16:58:05 -0500 | [diff] [blame] | 271 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) || IS_ENABLED(CONFIG_TRACEPOINTS) |
Trond Myklebust | c44fe70 | 2007-06-16 14:17:01 -0400 | [diff] [blame] | 272 | static void rpc_task_set_debuginfo(struct rpc_task *task) |
| 273 | { |
| 274 | static atomic_t rpc_pid; |
| 275 | |
Trond Myklebust | c44fe70 | 2007-06-16 14:17:01 -0400 | [diff] [blame] | 276 | task->tk_pid = atomic_inc_return(&rpc_pid); |
| 277 | } |
| 278 | #else |
| 279 | static inline void rpc_task_set_debuginfo(struct rpc_task *task) |
| 280 | { |
| 281 | } |
| 282 | #endif |
| 283 | |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 284 | static void rpc_set_active(struct rpc_task *task) |
| 285 | { |
Trond Myklebust | c44fe70 | 2007-06-16 14:17:01 -0400 | [diff] [blame] | 286 | rpc_task_set_debuginfo(task); |
Trond Myklebust | 58f9612 | 2010-07-31 14:29:08 -0400 | [diff] [blame] | 287 | set_bit(RPC_TASK_ACTIVE, &task->tk_runstate); |
Chuck Lever | acbe104 | 2017-11-03 13:46:06 -0400 | [diff] [blame] | 288 | trace_rpc_task_begin(task->tk_client, task, NULL); |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 289 | } |
| 290 | |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 291 | /* |
| 292 | * Mark an RPC call as having completed by clearing the 'active' bit |
Trond Myklebust | bf294b4 | 2011-02-21 11:05:41 -0800 | [diff] [blame] | 293 | * and then waking up all tasks that were sleeping. |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 294 | */ |
Trond Myklebust | bf294b4 | 2011-02-21 11:05:41 -0800 | [diff] [blame] | 295 | static int rpc_complete_task(struct rpc_task *task) |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 296 | { |
Trond Myklebust | bf294b4 | 2011-02-21 11:05:41 -0800 | [diff] [blame] | 297 | void *m = &task->tk_runstate; |
| 298 | wait_queue_head_t *wq = bit_waitqueue(m, RPC_TASK_ACTIVE); |
| 299 | struct wait_bit_key k = __WAIT_BIT_KEY_INITIALIZER(m, RPC_TASK_ACTIVE); |
| 300 | unsigned long flags; |
| 301 | int ret; |
| 302 | |
Trond Myklebust | 82b0a4c | 2012-01-20 14:52:23 -0500 | [diff] [blame] | 303 | trace_rpc_task_complete(task->tk_client, task, NULL); |
| 304 | |
Trond Myklebust | bf294b4 | 2011-02-21 11:05:41 -0800 | [diff] [blame] | 305 | spin_lock_irqsave(&wq->lock, flags); |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 306 | clear_bit(RPC_TASK_ACTIVE, &task->tk_runstate); |
Trond Myklebust | bf294b4 | 2011-02-21 11:05:41 -0800 | [diff] [blame] | 307 | ret = atomic_dec_and_test(&task->tk_count); |
| 308 | if (waitqueue_active(wq)) |
Andrea Arcangeli | ac5be6b | 2015-09-22 14:58:49 -0700 | [diff] [blame] | 309 | __wake_up_locked_key(wq, TASK_NORMAL, &k); |
Trond Myklebust | bf294b4 | 2011-02-21 11:05:41 -0800 | [diff] [blame] | 310 | spin_unlock_irqrestore(&wq->lock, flags); |
| 311 | return ret; |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 312 | } |
| 313 | |
| 314 | /* |
| 315 | * Allow callers to wait for completion of an RPC call |
Trond Myklebust | bf294b4 | 2011-02-21 11:05:41 -0800 | [diff] [blame] | 316 | * |
| 317 | * Note the use of out_of_line_wait_on_bit() rather than wait_on_bit() |
| 318 | * to enforce taking of the wq->lock and hence avoid races with |
| 319 | * rpc_complete_task(). |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 320 | */ |
NeilBrown | c122132 | 2014-07-07 15:16:04 +1000 | [diff] [blame] | 321 | int __rpc_wait_for_completion_task(struct rpc_task *task, wait_bit_action_f *action) |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 322 | { |
| 323 | if (action == NULL) |
Matthew Wilcox | 150030b | 2007-12-06 16:24:39 -0500 | [diff] [blame] | 324 | action = rpc_wait_bit_killable; |
Trond Myklebust | bf294b4 | 2011-02-21 11:05:41 -0800 | [diff] [blame] | 325 | 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] | 326 | action, TASK_KILLABLE); |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 327 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 328 | EXPORT_SYMBOL_GPL(__rpc_wait_for_completion_task); |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 329 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | /* |
| 331 | * Make an RPC task runnable. |
| 332 | * |
Jeff Layton | 506026c | 2012-07-23 15:51:55 -0400 | [diff] [blame] | 333 | * Note: If the task is ASYNC, and is being made runnable after sitting on an |
| 334 | * rpc_wait_queue, this must be called with the queue spinlock held to protect |
| 335 | * the wait queue operation. |
Trond Myklebust | a3c3cac | 2013-05-22 12:57:24 -0400 | [diff] [blame] | 336 | * Note the ordering of rpc_test_and_set_running() and rpc_clear_queued(), |
| 337 | * which is needed to ensure that __rpc_execute() doesn't loop (due to the |
| 338 | * lockless RPC_IS_QUEUED() test) before we've had a chance to test |
| 339 | * the RPC_TASK_RUNNING flag. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | */ |
Trond Myklebust | f1dc237 | 2016-05-27 12:59:33 -0400 | [diff] [blame] | 341 | static void rpc_make_runnable(struct workqueue_struct *wq, |
| 342 | struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | { |
Trond Myklebust | a3c3cac | 2013-05-22 12:57:24 -0400 | [diff] [blame] | 344 | bool need_wakeup = !rpc_test_and_set_running(task); |
| 345 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | rpc_clear_queued(task); |
Trond Myklebust | a3c3cac | 2013-05-22 12:57:24 -0400 | [diff] [blame] | 347 | if (!need_wakeup) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | return; |
| 349 | if (RPC_IS_ASYNC(task)) { |
David Howells | 65f27f3 | 2006-11-22 14:55:48 +0000 | [diff] [blame] | 350 | INIT_WORK(&task->u.tk_work, rpc_async_schedule); |
Trond Myklebust | f1dc237 | 2016-05-27 12:59:33 -0400 | [diff] [blame] | 351 | queue_work(wq, &task->u.tk_work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | } else |
Trond Myklebust | 96651ab | 2005-06-22 17:16:21 +0000 | [diff] [blame] | 353 | wake_up_bit(&task->tk_runstate, RPC_TASK_QUEUED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | } |
| 355 | |
| 356 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | * Prepare for sleeping on a wait queue. |
| 358 | * By always appending tasks to the list we ensure FIFO behavior. |
| 359 | * NB: An RPC task will only receive interrupt-driven events as long |
| 360 | * as it's on a wait queue. |
| 361 | */ |
Trond Myklebust | 3b27bad | 2011-07-17 18:11:34 -0400 | [diff] [blame] | 362 | static void __rpc_sleep_on_priority(struct rpc_wait_queue *q, |
| 363 | struct rpc_task *task, |
| 364 | rpc_action action, |
| 365 | unsigned char queue_priority) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | { |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 367 | dprintk("RPC: %5u sleep_on(queue \"%s\" time %lu)\n", |
| 368 | task->tk_pid, rpc_qname(q), jiffies); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | |
Trond Myklebust | 82b0a4c | 2012-01-20 14:52:23 -0500 | [diff] [blame] | 370 | trace_rpc_task_sleep(task->tk_client, task, q); |
| 371 | |
Trond Myklebust | 3b27bad | 2011-07-17 18:11:34 -0400 | [diff] [blame] | 372 | __rpc_add_wait_queue(q, task, queue_priority); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | |
Weston Andros Adamson | f50ad42 | 2012-10-23 10:43:46 -0400 | [diff] [blame] | 374 | WARN_ON_ONCE(task->tk_callback != NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | task->tk_callback = action; |
Trond Myklebust | eb276c0 | 2008-02-22 17:27:59 -0500 | [diff] [blame] | 376 | __rpc_add_timer(q, task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | } |
| 378 | |
| 379 | 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] | 380 | rpc_action action) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | { |
Trond Myklebust | 58f9612 | 2010-07-31 14:29:08 -0400 | [diff] [blame] | 382 | /* We shouldn't ever put an inactive task to sleep */ |
Weston Andros Adamson | e454a7a | 2012-10-23 10:43:32 -0400 | [diff] [blame] | 383 | WARN_ON_ONCE(!RPC_IS_ACTIVATED(task)); |
| 384 | if (!RPC_IS_ACTIVATED(task)) { |
| 385 | task->tk_status = -EIO; |
| 386 | rpc_put_task_async(task); |
| 387 | return; |
| 388 | } |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 389 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | /* |
| 391 | * Protect the queue operations. |
| 392 | */ |
| 393 | spin_lock_bh(&q->lock); |
Trond Myklebust | 3b27bad | 2011-07-17 18:11:34 -0400 | [diff] [blame] | 394 | __rpc_sleep_on_priority(q, task, action, task->tk_priority); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | spin_unlock_bh(&q->lock); |
| 396 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 397 | EXPORT_SYMBOL_GPL(rpc_sleep_on); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | |
Trond Myklebust | 3b27bad | 2011-07-17 18:11:34 -0400 | [diff] [blame] | 399 | void rpc_sleep_on_priority(struct rpc_wait_queue *q, struct rpc_task *task, |
| 400 | rpc_action action, int priority) |
| 401 | { |
| 402 | /* We shouldn't ever put an inactive task to sleep */ |
Weston Andros Adamson | e454a7a | 2012-10-23 10:43:32 -0400 | [diff] [blame] | 403 | WARN_ON_ONCE(!RPC_IS_ACTIVATED(task)); |
| 404 | if (!RPC_IS_ACTIVATED(task)) { |
| 405 | task->tk_status = -EIO; |
| 406 | rpc_put_task_async(task); |
| 407 | return; |
| 408 | } |
Trond Myklebust | 3b27bad | 2011-07-17 18:11:34 -0400 | [diff] [blame] | 409 | |
| 410 | /* |
| 411 | * Protect the queue operations. |
| 412 | */ |
| 413 | spin_lock_bh(&q->lock); |
| 414 | __rpc_sleep_on_priority(q, task, action, priority - RPC_PRIORITY_LOW); |
| 415 | spin_unlock_bh(&q->lock); |
| 416 | } |
Trond Myklebust | 1e1093c | 2012-11-01 16:44:05 -0400 | [diff] [blame] | 417 | EXPORT_SYMBOL_GPL(rpc_sleep_on_priority); |
Trond Myklebust | 3b27bad | 2011-07-17 18:11:34 -0400 | [diff] [blame] | 418 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | /** |
Trond Myklebust | f1dc237 | 2016-05-27 12:59:33 -0400 | [diff] [blame] | 420 | * __rpc_do_wake_up_task_on_wq - wake up a single rpc_task |
| 421 | * @wq: workqueue on which to run task |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 422 | * @queue: wait queue |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | * @task: task to be woken up |
| 424 | * |
| 425 | * Caller must hold queue->lock, and have cleared the task queued flag. |
| 426 | */ |
Trond Myklebust | f1dc237 | 2016-05-27 12:59:33 -0400 | [diff] [blame] | 427 | static void __rpc_do_wake_up_task_on_wq(struct workqueue_struct *wq, |
| 428 | struct rpc_wait_queue *queue, |
| 429 | struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | { |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 431 | dprintk("RPC: %5u __rpc_wake_up_task (now %lu)\n", |
| 432 | task->tk_pid, jiffies); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | /* Has the task been executed yet? If not, we cannot wake it up! */ |
| 435 | if (!RPC_IS_ACTIVATED(task)) { |
| 436 | printk(KERN_ERR "RPC: Inactive task (%p) being woken up!\n", task); |
| 437 | return; |
| 438 | } |
| 439 | |
Trond Myklebust | 82b0a4c | 2012-01-20 14:52:23 -0500 | [diff] [blame] | 440 | trace_rpc_task_wakeup(task->tk_client, task, queue); |
| 441 | |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 442 | __rpc_remove_wait_queue(queue, task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | |
Trond Myklebust | f1dc237 | 2016-05-27 12:59:33 -0400 | [diff] [blame] | 444 | rpc_make_runnable(wq, task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 446 | dprintk("RPC: __rpc_wake_up_task done\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | } |
| 448 | |
| 449 | /* |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 450 | * Wake up a queued task while the queue lock is being held |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | */ |
Trond Myklebust | f1dc237 | 2016-05-27 12:59:33 -0400 | [diff] [blame] | 452 | static void rpc_wake_up_task_on_wq_queue_locked(struct workqueue_struct *wq, |
| 453 | struct rpc_wait_queue *queue, struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | { |
Trond Myklebust | 1166fde6 | 2013-03-25 11:23:40 -0400 | [diff] [blame] | 455 | if (RPC_IS_QUEUED(task)) { |
| 456 | smp_rmb(); |
| 457 | if (task->tk_waitqueue == queue) |
Trond Myklebust | f1dc237 | 2016-05-27 12:59:33 -0400 | [diff] [blame] | 458 | __rpc_do_wake_up_task_on_wq(wq, queue, task); |
Trond Myklebust | 1166fde6 | 2013-03-25 11:23:40 -0400 | [diff] [blame] | 459 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | } |
| 461 | |
| 462 | /* |
Trond Myklebust | f1dc237 | 2016-05-27 12:59:33 -0400 | [diff] [blame] | 463 | * Wake up a queued task while the queue lock is being held |
| 464 | */ |
| 465 | static void rpc_wake_up_task_queue_locked(struct rpc_wait_queue *queue, struct rpc_task *task) |
| 466 | { |
| 467 | rpc_wake_up_task_on_wq_queue_locked(rpciod_workqueue, queue, task); |
| 468 | } |
| 469 | |
| 470 | /* |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 471 | * Wake up a task on a specific queue |
| 472 | */ |
| 473 | void rpc_wake_up_queued_task(struct rpc_wait_queue *queue, struct rpc_task *task) |
| 474 | { |
Trond Myklebust | 5e4424a | 2008-02-25 21:53:49 -0800 | [diff] [blame] | 475 | spin_lock_bh(&queue->lock); |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 476 | rpc_wake_up_task_queue_locked(queue, task); |
Trond Myklebust | 5e4424a | 2008-02-25 21:53:49 -0800 | [diff] [blame] | 477 | spin_unlock_bh(&queue->lock); |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 478 | } |
| 479 | EXPORT_SYMBOL_GPL(rpc_wake_up_queued_task); |
| 480 | |
| 481 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | * Wake up the next task on a priority queue. |
| 483 | */ |
Trond Myklebust | 961a828 | 2012-01-17 22:57:37 -0500 | [diff] [blame] | 484 | 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] | 485 | { |
| 486 | struct list_head *q; |
| 487 | struct rpc_task *task; |
| 488 | |
| 489 | /* |
Zhang Xiaoxu | cec2cc0 | 2021-06-26 15:50:42 +0800 | [diff] [blame] | 490 | * Service the privileged queue. |
| 491 | */ |
| 492 | q = &queue->tasks[RPC_NR_PRIORITY - 1]; |
| 493 | if (queue->maxpriority > RPC_PRIORITY_PRIVILEGED && !list_empty(q)) { |
| 494 | task = list_first_entry(q, struct rpc_task, u.tk_wait.list); |
| 495 | goto out; |
| 496 | } |
| 497 | |
| 498 | /* |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 499 | * Service a batch of tasks from a single owner. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | */ |
| 501 | q = &queue->tasks[queue->priority]; |
Zhang Xiaoxu | a08048f | 2021-06-26 15:50:41 +0800 | [diff] [blame] | 502 | if (!list_empty(q) && queue->nr) { |
| 503 | queue->nr--; |
Trond Myklebust | 3d82780 | 2018-09-08 22:09:48 -0400 | [diff] [blame] | 504 | task = list_first_entry(q, struct rpc_task, u.tk_wait.list); |
| 505 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | } |
| 507 | |
| 508 | /* |
| 509 | * Service the next queue. |
| 510 | */ |
| 511 | do { |
| 512 | if (q == &queue->tasks[0]) |
| 513 | q = &queue->tasks[queue->maxpriority]; |
| 514 | else |
| 515 | q = q - 1; |
| 516 | if (!list_empty(q)) { |
Trond Myklebust | 3d82780 | 2018-09-08 22:09:48 -0400 | [diff] [blame] | 517 | task = list_first_entry(q, struct rpc_task, u.tk_wait.list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | goto new_queue; |
| 519 | } |
| 520 | } while (q != &queue->tasks[queue->priority]); |
| 521 | |
| 522 | rpc_reset_waitqueue_priority(queue); |
| 523 | return NULL; |
| 524 | |
| 525 | new_queue: |
| 526 | rpc_set_waitqueue_priority(queue, (unsigned int)(q - &queue->tasks[0])); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | return task; |
| 529 | } |
| 530 | |
Trond Myklebust | 961a828 | 2012-01-17 22:57:37 -0500 | [diff] [blame] | 531 | static struct rpc_task *__rpc_find_next_queued(struct rpc_wait_queue *queue) |
| 532 | { |
| 533 | if (RPC_IS_PRIORITY(queue)) |
| 534 | return __rpc_find_next_queued_priority(queue); |
| 535 | if (!list_empty(&queue->tasks[0])) |
| 536 | return list_first_entry(&queue->tasks[0], struct rpc_task, u.tk_wait.list); |
| 537 | return NULL; |
| 538 | } |
| 539 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | /* |
Trond Myklebust | 961a828 | 2012-01-17 22:57:37 -0500 | [diff] [blame] | 541 | * Wake up the first task on the wait queue. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | */ |
Trond Myklebust | f1dc237 | 2016-05-27 12:59:33 -0400 | [diff] [blame] | 543 | struct rpc_task *rpc_wake_up_first_on_wq(struct workqueue_struct *wq, |
| 544 | struct rpc_wait_queue *queue, |
Trond Myklebust | 961a828 | 2012-01-17 22:57:37 -0500 | [diff] [blame] | 545 | bool (*func)(struct rpc_task *, void *), void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | { |
| 547 | struct rpc_task *task = NULL; |
| 548 | |
Trond Myklebust | 961a828 | 2012-01-17 22:57:37 -0500 | [diff] [blame] | 549 | dprintk("RPC: wake_up_first(%p \"%s\")\n", |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 550 | queue, rpc_qname(queue)); |
Trond Myklebust | 5e4424a | 2008-02-25 21:53:49 -0800 | [diff] [blame] | 551 | spin_lock_bh(&queue->lock); |
Trond Myklebust | 961a828 | 2012-01-17 22:57:37 -0500 | [diff] [blame] | 552 | task = __rpc_find_next_queued(queue); |
| 553 | if (task != NULL) { |
| 554 | if (func(task, data)) |
Trond Myklebust | f1dc237 | 2016-05-27 12:59:33 -0400 | [diff] [blame] | 555 | rpc_wake_up_task_on_wq_queue_locked(wq, queue, task); |
Trond Myklebust | 961a828 | 2012-01-17 22:57:37 -0500 | [diff] [blame] | 556 | else |
| 557 | task = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | } |
Trond Myklebust | 5e4424a | 2008-02-25 21:53:49 -0800 | [diff] [blame] | 559 | spin_unlock_bh(&queue->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | |
| 561 | return task; |
| 562 | } |
Trond Myklebust | f1dc237 | 2016-05-27 12:59:33 -0400 | [diff] [blame] | 563 | |
| 564 | /* |
| 565 | * Wake up the first task on the wait queue. |
| 566 | */ |
| 567 | struct rpc_task *rpc_wake_up_first(struct rpc_wait_queue *queue, |
| 568 | bool (*func)(struct rpc_task *, void *), void *data) |
| 569 | { |
| 570 | return rpc_wake_up_first_on_wq(rpciod_workqueue, queue, func, data); |
| 571 | } |
Trond Myklebust | 961a828 | 2012-01-17 22:57:37 -0500 | [diff] [blame] | 572 | EXPORT_SYMBOL_GPL(rpc_wake_up_first); |
| 573 | |
| 574 | static bool rpc_wake_up_next_func(struct rpc_task *task, void *data) |
| 575 | { |
| 576 | return true; |
| 577 | } |
| 578 | |
| 579 | /* |
| 580 | * Wake up the next task on the wait queue. |
| 581 | */ |
| 582 | struct rpc_task *rpc_wake_up_next(struct rpc_wait_queue *queue) |
| 583 | { |
| 584 | return rpc_wake_up_first(queue, rpc_wake_up_next_func, NULL); |
| 585 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 586 | EXPORT_SYMBOL_GPL(rpc_wake_up_next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | |
| 588 | /** |
| 589 | * rpc_wake_up - wake up all rpc_tasks |
| 590 | * @queue: rpc_wait_queue on which the tasks are sleeping |
| 591 | * |
| 592 | * Grabs queue->lock |
| 593 | */ |
| 594 | void rpc_wake_up(struct rpc_wait_queue *queue) |
| 595 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | struct list_head *head; |
Trond Myklebust | e6d83d5 | 2006-03-13 21:20:48 -0800 | [diff] [blame] | 597 | |
Trond Myklebust | 5e4424a | 2008-02-25 21:53:49 -0800 | [diff] [blame] | 598 | spin_lock_bh(&queue->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | head = &queue->tasks[queue->maxpriority]; |
| 600 | for (;;) { |
Trond Myklebust | 540a0f7 | 2012-03-19 13:39:35 -0400 | [diff] [blame] | 601 | while (!list_empty(head)) { |
| 602 | struct rpc_task *task; |
| 603 | task = list_first_entry(head, |
| 604 | struct rpc_task, |
| 605 | u.tk_wait.list); |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 606 | rpc_wake_up_task_queue_locked(queue, task); |
Trond Myklebust | 540a0f7 | 2012-03-19 13:39:35 -0400 | [diff] [blame] | 607 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | if (head == &queue->tasks[0]) |
| 609 | break; |
| 610 | head--; |
| 611 | } |
Trond Myklebust | 5e4424a | 2008-02-25 21:53:49 -0800 | [diff] [blame] | 612 | spin_unlock_bh(&queue->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 614 | EXPORT_SYMBOL_GPL(rpc_wake_up); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | |
| 616 | /** |
| 617 | * rpc_wake_up_status - wake up all rpc_tasks and set their status value. |
| 618 | * @queue: rpc_wait_queue on which the tasks are sleeping |
| 619 | * @status: status value to set |
| 620 | * |
| 621 | * Grabs queue->lock |
| 622 | */ |
| 623 | void rpc_wake_up_status(struct rpc_wait_queue *queue, int status) |
| 624 | { |
| 625 | struct list_head *head; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | |
Trond Myklebust | 5e4424a | 2008-02-25 21:53:49 -0800 | [diff] [blame] | 627 | spin_lock_bh(&queue->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | head = &queue->tasks[queue->maxpriority]; |
| 629 | for (;;) { |
Trond Myklebust | 540a0f7 | 2012-03-19 13:39:35 -0400 | [diff] [blame] | 630 | while (!list_empty(head)) { |
| 631 | struct rpc_task *task; |
| 632 | task = list_first_entry(head, |
| 633 | struct rpc_task, |
| 634 | u.tk_wait.list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 635 | task->tk_status = status; |
Trond Myklebust | 96ef13b | 2008-02-22 15:46:41 -0500 | [diff] [blame] | 636 | rpc_wake_up_task_queue_locked(queue, task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | } |
| 638 | if (head == &queue->tasks[0]) |
| 639 | break; |
| 640 | head--; |
| 641 | } |
Trond Myklebust | 5e4424a | 2008-02-25 21:53:49 -0800 | [diff] [blame] | 642 | spin_unlock_bh(&queue->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 644 | EXPORT_SYMBOL_GPL(rpc_wake_up_status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | |
Trond Myklebust | 36df9aa | 2007-07-18 16:18:52 -0400 | [diff] [blame] | 646 | static void __rpc_queue_timer_fn(unsigned long ptr) |
| 647 | { |
| 648 | struct rpc_wait_queue *queue = (struct rpc_wait_queue *)ptr; |
| 649 | struct rpc_task *task, *n; |
| 650 | unsigned long expires, now, timeo; |
| 651 | |
| 652 | spin_lock(&queue->lock); |
| 653 | expires = now = jiffies; |
| 654 | list_for_each_entry_safe(task, n, &queue->timer_list.list, u.tk_wait.timer_list) { |
| 655 | timeo = task->u.tk_wait.expires; |
| 656 | if (time_after_eq(now, timeo)) { |
Trond Myklebust | 36df9aa | 2007-07-18 16:18:52 -0400 | [diff] [blame] | 657 | dprintk("RPC: %5u timeout\n", task->tk_pid); |
| 658 | task->tk_status = -ETIMEDOUT; |
| 659 | rpc_wake_up_task_queue_locked(queue, task); |
| 660 | continue; |
| 661 | } |
| 662 | if (expires == now || time_after(expires, timeo)) |
| 663 | expires = timeo; |
| 664 | } |
| 665 | if (!list_empty(&queue->timer_list.list)) |
| 666 | rpc_set_queue_timer(queue, expires); |
| 667 | spin_unlock(&queue->lock); |
| 668 | } |
| 669 | |
Trond Myklebust | 8014793 | 2006-08-31 18:24:08 -0400 | [diff] [blame] | 670 | static void __rpc_atrun(struct rpc_task *task) |
| 671 | { |
Trond Myklebust | 6bd1441 | 2014-03-20 12:53:54 -0400 | [diff] [blame] | 672 | if (task->tk_status == -ETIMEDOUT) |
| 673 | task->tk_status = 0; |
Trond Myklebust | 8014793 | 2006-08-31 18:24:08 -0400 | [diff] [blame] | 674 | } |
| 675 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | /* |
| 677 | * Run a task at a later time |
| 678 | */ |
Trond Myklebust | 8014793 | 2006-08-31 18:24:08 -0400 | [diff] [blame] | 679 | void rpc_delay(struct rpc_task *task, unsigned long delay) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | { |
| 681 | task->tk_timeout = delay; |
Trond Myklebust | 5d00837 | 2008-02-22 16:34:17 -0500 | [diff] [blame] | 682 | rpc_sleep_on(&delay_queue, task, __rpc_atrun); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 684 | EXPORT_SYMBOL_GPL(rpc_delay); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | /* |
Trond Myklebust | 4ce70ad | 2006-01-03 09:55:05 +0100 | [diff] [blame] | 687 | * Helper to call task->tk_ops->rpc_call_prepare |
| 688 | */ |
Andy Adamson | aae2006 | 2009-04-01 09:22:40 -0400 | [diff] [blame] | 689 | void rpc_prepare_task(struct rpc_task *task) |
Trond Myklebust | 4ce70ad | 2006-01-03 09:55:05 +0100 | [diff] [blame] | 690 | { |
| 691 | task->tk_ops->rpc_call_prepare(task, task->tk_calldata); |
| 692 | } |
| 693 | |
Trond Myklebust | 7fdcf13 | 2011-12-01 14:00:15 -0500 | [diff] [blame] | 694 | static void |
| 695 | rpc_init_task_statistics(struct rpc_task *task) |
| 696 | { |
| 697 | /* Initialize retry counters */ |
| 698 | task->tk_garb_retry = 2; |
| 699 | task->tk_cred_retry = 2; |
| 700 | task->tk_rebind_retry = 2; |
| 701 | |
| 702 | /* starting timestamp */ |
| 703 | task->tk_start = ktime_get(); |
| 704 | } |
| 705 | |
| 706 | static void |
| 707 | rpc_reset_task_statistics(struct rpc_task *task) |
| 708 | { |
| 709 | task->tk_timeouts = 0; |
| 710 | task->tk_flags &= ~(RPC_CALL_MAJORSEEN|RPC_TASK_KILLED|RPC_TASK_SENT); |
| 711 | |
| 712 | rpc_init_task_statistics(task); |
| 713 | } |
| 714 | |
Trond Myklebust | 4ce70ad | 2006-01-03 09:55:05 +0100 | [diff] [blame] | 715 | /* |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 716 | * Helper that calls task->tk_ops->rpc_call_done if it exists |
Trond Myklebust | d05fdb0 | 2005-06-22 17:16:19 +0000 | [diff] [blame] | 717 | */ |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 718 | void rpc_exit_task(struct rpc_task *task) |
Trond Myklebust | d05fdb0 | 2005-06-22 17:16:19 +0000 | [diff] [blame] | 719 | { |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 720 | task->tk_action = NULL; |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 721 | if (task->tk_ops->rpc_call_done != NULL) { |
| 722 | task->tk_ops->rpc_call_done(task, task->tk_calldata); |
Trond Myklebust | d05fdb0 | 2005-06-22 17:16:19 +0000 | [diff] [blame] | 723 | if (task->tk_action != NULL) { |
Trond Myklebust | abbcf28 | 2006-01-03 09:55:03 +0100 | [diff] [blame] | 724 | WARN_ON(RPC_ASSASSINATED(task)); |
| 725 | /* Always release the RPC slot and buffer memory */ |
| 726 | xprt_release(task); |
Trond Myklebust | 7fdcf13 | 2011-12-01 14:00:15 -0500 | [diff] [blame] | 727 | rpc_reset_task_statistics(task); |
Trond Myklebust | d05fdb0 | 2005-06-22 17:16:19 +0000 | [diff] [blame] | 728 | } |
| 729 | } |
Trond Myklebust | d05fdb0 | 2005-06-22 17:16:19 +0000 | [diff] [blame] | 730 | } |
Trond Myklebust | d9b6cd9 | 2010-07-31 14:29:08 -0400 | [diff] [blame] | 731 | |
| 732 | void rpc_exit(struct rpc_task *task, int status) |
| 733 | { |
| 734 | task->tk_status = status; |
| 735 | task->tk_action = rpc_exit_task; |
| 736 | if (RPC_IS_QUEUED(task)) |
| 737 | rpc_wake_up_queued_task(task->tk_waitqueue, task); |
| 738 | } |
| 739 | EXPORT_SYMBOL_GPL(rpc_exit); |
Trond Myklebust | d05fdb0 | 2005-06-22 17:16:19 +0000 | [diff] [blame] | 740 | |
Trond Myklebust | bbd5a1f | 2006-10-18 16:01:05 -0400 | [diff] [blame] | 741 | void rpc_release_calldata(const struct rpc_call_ops *ops, void *calldata) |
| 742 | { |
Trond Myklebust | a86dc49 | 2008-06-11 13:37:09 -0400 | [diff] [blame] | 743 | if (ops->rpc_release != NULL) |
Trond Myklebust | bbd5a1f | 2006-10-18 16:01:05 -0400 | [diff] [blame] | 744 | ops->rpc_release(calldata); |
Trond Myklebust | bbd5a1f | 2006-10-18 16:01:05 -0400 | [diff] [blame] | 745 | } |
| 746 | |
Trond Myklebust | d05fdb0 | 2005-06-22 17:16:19 +0000 | [diff] [blame] | 747 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | * This is the RPC `scheduler' (or rather, the finite state machine). |
| 749 | */ |
Trond Myklebust | 2efef83 | 2007-02-03 13:38:41 -0800 | [diff] [blame] | 750 | static void __rpc_execute(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | { |
Trond Myklebust | eb9b55a | 2009-03-10 20:33:16 -0400 | [diff] [blame] | 752 | struct rpc_wait_queue *queue; |
| 753 | int task_is_async = RPC_IS_ASYNC(task); |
| 754 | int status = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 755 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 756 | dprintk("RPC: %5u __rpc_execute flags=0x%x\n", |
| 757 | task->tk_pid, task->tk_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | |
Weston Andros Adamson | 2bd4eef | 2012-10-23 10:43:47 -0400 | [diff] [blame] | 759 | WARN_ON_ONCE(RPC_IS_QUEUED(task)); |
| 760 | if (RPC_IS_QUEUED(task)) |
| 761 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | |
Trond Myklebust | d05fdb0 | 2005-06-22 17:16:19 +0000 | [diff] [blame] | 763 | for (;;) { |
Trond Myklebust | b55c598 | 2011-07-06 19:58:23 -0400 | [diff] [blame] | 764 | void (*do_action)(struct rpc_task *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | |
| 766 | /* |
Trond Myklebust | b55c598 | 2011-07-06 19:58:23 -0400 | [diff] [blame] | 767 | * Execute any pending callback first. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | */ |
Trond Myklebust | b55c598 | 2011-07-06 19:58:23 -0400 | [diff] [blame] | 769 | do_action = task->tk_callback; |
| 770 | task->tk_callback = NULL; |
| 771 | if (do_action == NULL) { |
Trond Myklebust | e020c68 | 2011-03-15 19:56:30 -0400 | [diff] [blame] | 772 | /* |
| 773 | * Perform the next FSM step. |
Trond Myklebust | b55c598 | 2011-07-06 19:58:23 -0400 | [diff] [blame] | 774 | * tk_action may be NULL if the task has been killed. |
| 775 | * In particular, note that rpc_killall_tasks may |
| 776 | * do this at any time, so beware when dereferencing. |
Trond Myklebust | e020c68 | 2011-03-15 19:56:30 -0400 | [diff] [blame] | 777 | */ |
Trond Myklebust | b55c598 | 2011-07-06 19:58:23 -0400 | [diff] [blame] | 778 | do_action = task->tk_action; |
| 779 | if (do_action == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | } |
Trond Myklebust | 82b0a4c | 2012-01-20 14:52:23 -0500 | [diff] [blame] | 782 | trace_rpc_task_run_action(task->tk_client, task, task->tk_action); |
Trond Myklebust | b55c598 | 2011-07-06 19:58:23 -0400 | [diff] [blame] | 783 | do_action(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | |
| 785 | /* |
| 786 | * Lockless check for whether task is sleeping or not. |
| 787 | */ |
| 788 | if (!RPC_IS_QUEUED(task)) |
| 789 | continue; |
Trond Myklebust | eb9b55a | 2009-03-10 20:33:16 -0400 | [diff] [blame] | 790 | /* |
| 791 | * The queue->lock protects against races with |
| 792 | * rpc_make_runnable(). |
| 793 | * |
| 794 | * Note that once we clear RPC_TASK_RUNNING on an asynchronous |
| 795 | * rpc_task, rpc_make_runnable() can assign it to a |
| 796 | * different workqueue. We therefore cannot assume that the |
| 797 | * rpc_task pointer may still be dereferenced. |
| 798 | */ |
| 799 | queue = task->tk_waitqueue; |
| 800 | spin_lock_bh(&queue->lock); |
| 801 | if (!RPC_IS_QUEUED(task)) { |
| 802 | spin_unlock_bh(&queue->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | continue; |
| 804 | } |
Trond Myklebust | eb9b55a | 2009-03-10 20:33:16 -0400 | [diff] [blame] | 805 | rpc_clear_running(task); |
| 806 | spin_unlock_bh(&queue->lock); |
| 807 | if (task_is_async) |
| 808 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | |
| 810 | /* sync task: sleep here */ |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 811 | dprintk("RPC: %5u sync task going to sleep\n", task->tk_pid); |
Trond Myklebust | 96651ab | 2005-06-22 17:16:21 +0000 | [diff] [blame] | 812 | status = out_of_line_wait_on_bit(&task->tk_runstate, |
Matthew Wilcox | 150030b | 2007-12-06 16:24:39 -0500 | [diff] [blame] | 813 | RPC_TASK_QUEUED, rpc_wait_bit_killable, |
| 814 | TASK_KILLABLE); |
Trond Myklebust | 96651ab | 2005-06-22 17:16:21 +0000 | [diff] [blame] | 815 | if (status == -ERESTARTSYS) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 816 | /* |
| 817 | * When a sync task receives a signal, it exits with |
| 818 | * -ERESTARTSYS. In order to catch any callbacks that |
| 819 | * clean up after sleeping on some queue, we don't |
| 820 | * break the loop here, but go around once more. |
| 821 | */ |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 822 | dprintk("RPC: %5u got signal\n", task->tk_pid); |
Trond Myklebust | 96651ab | 2005-06-22 17:16:21 +0000 | [diff] [blame] | 823 | task->tk_flags |= RPC_TASK_KILLED; |
| 824 | rpc_exit(task, -ERESTARTSYS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | } |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 826 | dprintk("RPC: %5u sync task resuming\n", task->tk_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | } |
| 828 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 829 | dprintk("RPC: %5u return %d, status %d\n", task->tk_pid, status, |
| 830 | task->tk_status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | /* Release all resources associated with the task */ |
| 832 | rpc_release_task(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | } |
| 834 | |
| 835 | /* |
| 836 | * User-visible entry point to the scheduler. |
| 837 | * |
| 838 | * This may be called recursively if e.g. an async NFS task updates |
| 839 | * the attributes and finds that dirty pages must be flushed. |
| 840 | * NOTE: Upon exit of this function the task is guaranteed to be |
| 841 | * released. In particular note that tk_release() will have |
| 842 | * been called, so your task memory may have been freed. |
| 843 | */ |
Trond Myklebust | 2efef83 | 2007-02-03 13:38:41 -0800 | [diff] [blame] | 844 | void rpc_execute(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | { |
Trond Myklebust | a76580f | 2013-05-20 23:00:18 -0400 | [diff] [blame] | 846 | bool is_async = RPC_IS_ASYNC(task); |
| 847 | |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 848 | rpc_set_active(task); |
Trond Myklebust | f1dc237 | 2016-05-27 12:59:33 -0400 | [diff] [blame] | 849 | rpc_make_runnable(rpciod_workqueue, task); |
Trond Myklebust | a76580f | 2013-05-20 23:00:18 -0400 | [diff] [blame] | 850 | if (!is_async) |
Trond Myklebust | d6a1ed0 | 2010-07-31 14:29:08 -0400 | [diff] [blame] | 851 | __rpc_execute(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | } |
| 853 | |
David Howells | 65f27f3 | 2006-11-22 14:55:48 +0000 | [diff] [blame] | 854 | static void rpc_async_schedule(struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | { |
David Howells | 65f27f3 | 2006-11-22 14:55:48 +0000 | [diff] [blame] | 856 | __rpc_execute(container_of(work, struct rpc_task, u.tk_work)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 857 | } |
| 858 | |
Chuck Lever | 0210714 | 2006-01-03 09:55:49 +0100 | [diff] [blame] | 859 | /** |
Chuck Lever | 5fe6eaa | 2016-09-15 10:55:20 -0400 | [diff] [blame] | 860 | * rpc_malloc - allocate RPC buffer resources |
| 861 | * @task: RPC task |
| 862 | * |
| 863 | * A single memory region is allocated, which is split between the |
| 864 | * RPC call and RPC reply that this task is being used for. When |
| 865 | * this RPC is retired, the memory is released by calling rpc_free. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 866 | * |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 867 | * To prevent rpciod from hanging, this allocator never sleeps, |
Chuck Lever | 5fe6eaa | 2016-09-15 10:55:20 -0400 | [diff] [blame] | 868 | * returning -ENOMEM and suppressing warning if the request cannot |
| 869 | * be serviced immediately. The caller can arrange to sleep in a |
| 870 | * way that is safe for rpciod. |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 871 | * |
| 872 | * Most requests are 'small' (under 2KiB) and can be serviced from a |
| 873 | * mempool, ensuring that NFS reads and writes can always proceed, |
| 874 | * and that there is good locality of reference for these buffers. |
| 875 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 876 | * In order to avoid memory starvation triggering more writebacks of |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 877 | * NFS requests, we avoid using GFP_KERNEL. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | */ |
Chuck Lever | 5fe6eaa | 2016-09-15 10:55:20 -0400 | [diff] [blame] | 879 | int rpc_malloc(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | { |
Chuck Lever | 5fe6eaa | 2016-09-15 10:55:20 -0400 | [diff] [blame] | 881 | struct rpc_rqst *rqst = task->tk_rqstp; |
| 882 | size_t size = rqst->rq_callsize + rqst->rq_rcvsize; |
Chuck Lever | aa3d1fa | 2007-05-08 18:23:28 -0400 | [diff] [blame] | 883 | struct rpc_buffer *buf; |
Trond Myklebust | c4a7ca7 | 2015-01-23 14:50:56 -0500 | [diff] [blame] | 884 | gfp_t gfp = GFP_NOIO | __GFP_NOWARN; |
Mel Gorman | a564b8f | 2012-07-31 16:45:12 -0700 | [diff] [blame] | 885 | |
NeilBrown | cec05d9 | 2022-03-07 10:41:44 +1100 | [diff] [blame] | 886 | if (RPC_IS_ASYNC(task)) |
| 887 | gfp = GFP_NOWAIT | __GFP_NOWARN; |
Mel Gorman | a564b8f | 2012-07-31 16:45:12 -0700 | [diff] [blame] | 888 | if (RPC_IS_SWAPPER(task)) |
NeilBrown | cec05d9 | 2022-03-07 10:41:44 +1100 | [diff] [blame] | 889 | gfp |= __GFP_MEMALLOC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 890 | |
Chuck Lever | aa3d1fa | 2007-05-08 18:23:28 -0400 | [diff] [blame] | 891 | size += sizeof(struct rpc_buffer); |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 892 | if (size <= RPC_BUFFER_MAXSIZE) |
| 893 | buf = mempool_alloc(rpc_buffer_mempool, gfp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 894 | else |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 895 | buf = kmalloc(size, gfp); |
Peter Zijlstra | ddce40d | 2007-05-09 08:30:11 +0200 | [diff] [blame] | 896 | |
| 897 | if (!buf) |
Chuck Lever | 5fe6eaa | 2016-09-15 10:55:20 -0400 | [diff] [blame] | 898 | return -ENOMEM; |
Peter Zijlstra | ddce40d | 2007-05-09 08:30:11 +0200 | [diff] [blame] | 899 | |
Chuck Lever | aa3d1fa | 2007-05-08 18:23:28 -0400 | [diff] [blame] | 900 | buf->len = size; |
Geert Uytterhoeven | 215d067 | 2007-05-08 11:37:26 +0200 | [diff] [blame] | 901 | dprintk("RPC: %5u allocated buffer of size %zu at %p\n", |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 902 | task->tk_pid, size, buf); |
Chuck Lever | 5fe6eaa | 2016-09-15 10:55:20 -0400 | [diff] [blame] | 903 | rqst->rq_buffer = buf->data; |
Chuck Lever | 6877894 | 2016-09-15 10:55:37 -0400 | [diff] [blame] | 904 | rqst->rq_rbuffer = (char *)rqst->rq_buffer + rqst->rq_callsize; |
Chuck Lever | 5fe6eaa | 2016-09-15 10:55:20 -0400 | [diff] [blame] | 905 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 907 | EXPORT_SYMBOL_GPL(rpc_malloc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | |
Chuck Lever | 0210714 | 2006-01-03 09:55:49 +0100 | [diff] [blame] | 909 | /** |
Chuck Lever | 3435c74 | 2016-09-15 10:55:29 -0400 | [diff] [blame] | 910 | * rpc_free - free RPC buffer resources allocated via rpc_malloc |
| 911 | * @task: RPC task |
Chuck Lever | 0210714 | 2006-01-03 09:55:49 +0100 | [diff] [blame] | 912 | * |
| 913 | */ |
Chuck Lever | 3435c74 | 2016-09-15 10:55:29 -0400 | [diff] [blame] | 914 | void rpc_free(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 915 | { |
Chuck Lever | 3435c74 | 2016-09-15 10:55:29 -0400 | [diff] [blame] | 916 | void *buffer = task->tk_rqstp->rq_buffer; |
Chuck Lever | aa3d1fa | 2007-05-08 18:23:28 -0400 | [diff] [blame] | 917 | size_t size; |
| 918 | struct rpc_buffer *buf; |
Chuck Lever | 0210714 | 2006-01-03 09:55:49 +0100 | [diff] [blame] | 919 | |
Chuck Lever | aa3d1fa | 2007-05-08 18:23:28 -0400 | [diff] [blame] | 920 | buf = container_of(buffer, struct rpc_buffer, data); |
| 921 | size = buf->len; |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 922 | |
Geert Uytterhoeven | 215d067 | 2007-05-08 11:37:26 +0200 | [diff] [blame] | 923 | dprintk("RPC: freeing buffer of size %zu at %p\n", |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 924 | size, buf); |
Chuck Lever | aa3d1fa | 2007-05-08 18:23:28 -0400 | [diff] [blame] | 925 | |
Chuck Lever | c5a4dd8 | 2007-03-29 16:47:58 -0400 | [diff] [blame] | 926 | if (size <= RPC_BUFFER_MAXSIZE) |
| 927 | mempool_free(buf, rpc_buffer_mempool); |
| 928 | else |
| 929 | kfree(buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | } |
\"Talpey, Thomas\ | 1244480 | 2007-09-10 13:45:36 -0400 | [diff] [blame] | 931 | EXPORT_SYMBOL_GPL(rpc_free); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 932 | |
| 933 | /* |
| 934 | * Creation and deletion of RPC task structures |
| 935 | */ |
Trond Myklebust | 47fe064 | 2007-10-25 18:42:55 -0400 | [diff] [blame] | 936 | 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] | 937 | { |
| 938 | memset(task, 0, sizeof(*task)); |
Trond Myklebust | 44c2887 | 2006-01-03 09:55:06 +0100 | [diff] [blame] | 939 | atomic_set(&task->tk_count, 1); |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 940 | task->tk_flags = task_setup_data->flags; |
| 941 | task->tk_ops = task_setup_data->callback_ops; |
| 942 | task->tk_calldata = task_setup_data->callback_data; |
Trond Myklebust | 6529eba | 2007-06-14 16:40:14 -0400 | [diff] [blame] | 943 | INIT_LIST_HEAD(&task->tk_task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 944 | |
Trond Myklebust | 3ff7576 | 2007-07-14 15:40:00 -0400 | [diff] [blame] | 945 | task->tk_priority = task_setup_data->priority - RPC_PRIORITY_LOW; |
| 946 | task->tk_owner = current->tgid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 947 | |
| 948 | /* Initialize workqueue for async tasks */ |
Trond Myklebust | 32bfb5c | 2008-02-19 20:04:21 -0500 | [diff] [blame] | 949 | task->tk_workqueue = task_setup_data->workqueue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 950 | |
Trond Myklebust | 9d61498 | 2016-01-30 18:13:05 -0500 | [diff] [blame] | 951 | task->tk_xprt = xprt_get(task_setup_data->rpc_xprt); |
| 952 | |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 953 | if (task->tk_ops->rpc_call_prepare != NULL) |
| 954 | task->tk_action = rpc_prepare_task; |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 955 | |
Trond Myklebust | 7fdcf13 | 2011-12-01 14:00:15 -0500 | [diff] [blame] | 956 | rpc_init_task_statistics(task); |
Chuck Lever | ef759a2 | 2006-03-20 13:44:17 -0500 | [diff] [blame] | 957 | |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 958 | dprintk("RPC: new task initialized, procpid %u\n", |
Pavel Emelyanov | ba25f9d | 2007-10-18 23:40:40 -0700 | [diff] [blame] | 959 | task_pid_nr(current)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | } |
| 961 | |
| 962 | static struct rpc_task * |
| 963 | rpc_alloc_task(void) |
| 964 | { |
Mel Gorman | a564b8f | 2012-07-31 16:45:12 -0700 | [diff] [blame] | 965 | return (struct rpc_task *)mempool_alloc(rpc_task_mempool, GFP_NOIO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 966 | } |
| 967 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 968 | /* |
Trond Myklebust | 90c5755 | 2007-06-09 19:49:36 -0400 | [diff] [blame] | 969 | * Create a new task for the specified client. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | */ |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 971 | 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] | 972 | { |
Trond Myklebust | e8f5d77 | 2007-10-25 18:42:53 -0400 | [diff] [blame] | 973 | struct rpc_task *task = setup_data->task; |
| 974 | unsigned short flags = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 975 | |
Trond Myklebust | e8f5d77 | 2007-10-25 18:42:53 -0400 | [diff] [blame] | 976 | if (task == NULL) { |
| 977 | task = rpc_alloc_task(); |
Trond Myklebust | 19445b9 | 2010-04-16 16:41:10 -0400 | [diff] [blame] | 978 | if (task == NULL) { |
| 979 | rpc_release_calldata(setup_data->callback_ops, |
| 980 | setup_data->callback_data); |
| 981 | return ERR_PTR(-ENOMEM); |
| 982 | } |
Trond Myklebust | e8f5d77 | 2007-10-25 18:42:53 -0400 | [diff] [blame] | 983 | flags = RPC_TASK_DYNAMIC; |
| 984 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 985 | |
Trond Myklebust | 84115e1 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 986 | rpc_init_task(task, setup_data); |
Trond Myklebust | e8f5d77 | 2007-10-25 18:42:53 -0400 | [diff] [blame] | 987 | task->tk_flags |= flags; |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 988 | dprintk("RPC: allocated task %p\n", task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 989 | return task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | } |
| 991 | |
Trond Myklebust | c6567ed | 2013-01-04 12:23:21 -0500 | [diff] [blame] | 992 | /* |
| 993 | * rpc_free_task - release rpc task and perform cleanups |
| 994 | * |
| 995 | * Note that we free up the rpc_task _after_ rpc_release_calldata() |
| 996 | * in order to work around a workqueue dependency issue. |
| 997 | * |
| 998 | * Tejun Heo states: |
| 999 | * "Workqueue currently considers two work items to be the same if they're |
| 1000 | * on the same address and won't execute them concurrently - ie. it |
| 1001 | * makes a work item which is queued again while being executed wait |
| 1002 | * for the previous execution to complete. |
| 1003 | * |
| 1004 | * If a work function frees the work item, and then waits for an event |
| 1005 | * which should be performed by another work item and *that* work item |
| 1006 | * recycles the freed work item, it can create a false dependency loop. |
| 1007 | * There really is no reliable way to detect this short of verifying |
| 1008 | * every memory free." |
| 1009 | * |
| 1010 | */ |
Trond Myklebust | 32bfb5c | 2008-02-19 20:04:21 -0500 | [diff] [blame] | 1011 | static void rpc_free_task(struct rpc_task *task) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1012 | { |
Trond Myklebust | c6567ed | 2013-01-04 12:23:21 -0500 | [diff] [blame] | 1013 | unsigned short tk_flags = task->tk_flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1014 | |
Trond Myklebust | c6567ed | 2013-01-04 12:23:21 -0500 | [diff] [blame] | 1015 | rpc_release_calldata(task->tk_ops, task->tk_calldata); |
| 1016 | |
| 1017 | if (tk_flags & RPC_TASK_DYNAMIC) { |
Trond Myklebust | 5e4424a | 2008-02-25 21:53:49 -0800 | [diff] [blame] | 1018 | dprintk("RPC: %5u freeing task\n", task->tk_pid); |
| 1019 | mempool_free(task, rpc_task_mempool); |
| 1020 | } |
Trond Myklebust | 32bfb5c | 2008-02-19 20:04:21 -0500 | [diff] [blame] | 1021 | } |
| 1022 | |
| 1023 | static void rpc_async_release(struct work_struct *work) |
| 1024 | { |
| 1025 | rpc_free_task(container_of(work, struct rpc_task, u.tk_work)); |
| 1026 | } |
| 1027 | |
Trond Myklebust | bf294b4 | 2011-02-21 11:05:41 -0800 | [diff] [blame] | 1028 | static void rpc_release_resources_task(struct rpc_task *task) |
Trond Myklebust | 32bfb5c | 2008-02-19 20:04:21 -0500 | [diff] [blame] | 1029 | { |
Trond Myklebust | 87ed500 | 2013-01-07 14:30:46 -0500 | [diff] [blame] | 1030 | xprt_release(task); |
OGAWA Hirofumi | a271c5a | 2011-03-27 17:48:57 +0200 | [diff] [blame] | 1031 | if (task->tk_msg.rpc_cred) { |
Trond Myklebust | a17c215 | 2010-07-31 14:29:08 -0400 | [diff] [blame] | 1032 | put_rpccred(task->tk_msg.rpc_cred); |
OGAWA Hirofumi | a271c5a | 2011-03-27 17:48:57 +0200 | [diff] [blame] | 1033 | task->tk_msg.rpc_cred = NULL; |
| 1034 | } |
Trond Myklebust | 58f9612 | 2010-07-31 14:29:08 -0400 | [diff] [blame] | 1035 | rpc_task_release_client(task); |
Trond Myklebust | bf294b4 | 2011-02-21 11:05:41 -0800 | [diff] [blame] | 1036 | } |
| 1037 | |
| 1038 | static void rpc_final_put_task(struct rpc_task *task, |
| 1039 | struct workqueue_struct *q) |
| 1040 | { |
| 1041 | if (q != NULL) { |
Trond Myklebust | 32bfb5c | 2008-02-19 20:04:21 -0500 | [diff] [blame] | 1042 | INIT_WORK(&task->u.tk_work, rpc_async_release); |
Trond Myklebust | bf294b4 | 2011-02-21 11:05:41 -0800 | [diff] [blame] | 1043 | queue_work(q, &task->u.tk_work); |
Trond Myklebust | 32bfb5c | 2008-02-19 20:04:21 -0500 | [diff] [blame] | 1044 | } else |
| 1045 | rpc_free_task(task); |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 1046 | } |
Trond Myklebust | bf294b4 | 2011-02-21 11:05:41 -0800 | [diff] [blame] | 1047 | |
| 1048 | static void rpc_do_put_task(struct rpc_task *task, struct workqueue_struct *q) |
| 1049 | { |
| 1050 | if (atomic_dec_and_test(&task->tk_count)) { |
| 1051 | rpc_release_resources_task(task); |
| 1052 | rpc_final_put_task(task, q); |
| 1053 | } |
| 1054 | } |
| 1055 | |
| 1056 | void rpc_put_task(struct rpc_task *task) |
| 1057 | { |
| 1058 | rpc_do_put_task(task, NULL); |
| 1059 | } |
Trond Myklebust | e8914c6 | 2007-07-14 15:39:59 -0400 | [diff] [blame] | 1060 | EXPORT_SYMBOL_GPL(rpc_put_task); |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 1061 | |
Trond Myklebust | bf294b4 | 2011-02-21 11:05:41 -0800 | [diff] [blame] | 1062 | void rpc_put_task_async(struct rpc_task *task) |
| 1063 | { |
| 1064 | rpc_do_put_task(task, task->tk_workqueue); |
| 1065 | } |
| 1066 | EXPORT_SYMBOL_GPL(rpc_put_task_async); |
| 1067 | |
Trond Myklebust | bde8f00 | 2007-01-24 11:54:53 -0800 | [diff] [blame] | 1068 | static void rpc_release_task(struct rpc_task *task) |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 1069 | { |
Chuck Lever | 46121cf | 2007-01-31 12:14:08 -0500 | [diff] [blame] | 1070 | dprintk("RPC: %5u release task\n", task->tk_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1071 | |
Weston Andros Adamson | 0a0c2a5 | 2012-10-23 10:43:49 -0400 | [diff] [blame] | 1072 | WARN_ON_ONCE(RPC_IS_QUEUED(task)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1073 | |
Trond Myklebust | bf294b4 | 2011-02-21 11:05:41 -0800 | [diff] [blame] | 1074 | rpc_release_resources_task(task); |
Trond Myklebust | e6b3c4d | 2006-11-11 22:18:03 -0500 | [diff] [blame] | 1075 | |
Trond Myklebust | bf294b4 | 2011-02-21 11:05:41 -0800 | [diff] [blame] | 1076 | /* |
| 1077 | * Note: at this point we have been removed from rpc_clnt->cl_tasks, |
| 1078 | * so it should be safe to use task->tk_count as a test for whether |
| 1079 | * or not any other processes still hold references to our rpc_task. |
| 1080 | */ |
| 1081 | if (atomic_read(&task->tk_count) != 1 + !RPC_IS_ASYNC(task)) { |
| 1082 | /* Wake up anyone who may be waiting for task completion */ |
| 1083 | if (!rpc_complete_task(task)) |
| 1084 | return; |
| 1085 | } else { |
| 1086 | if (!atomic_dec_and_test(&task->tk_count)) |
| 1087 | return; |
| 1088 | } |
| 1089 | rpc_final_put_task(task, task->tk_workqueue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1090 | } |
| 1091 | |
Trond Myklebust | b247bbf | 2007-07-19 16:32:20 -0400 | [diff] [blame] | 1092 | int rpciod_up(void) |
| 1093 | { |
| 1094 | return try_module_get(THIS_MODULE) ? 0 : -EINVAL; |
| 1095 | } |
| 1096 | |
| 1097 | void rpciod_down(void) |
| 1098 | { |
| 1099 | module_put(THIS_MODULE); |
| 1100 | } |
| 1101 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1102 | /* |
Trond Myklebust | b247bbf | 2007-07-19 16:32:20 -0400 | [diff] [blame] | 1103 | * Start up the rpciod workqueue. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1104 | */ |
Trond Myklebust | b247bbf | 2007-07-19 16:32:20 -0400 | [diff] [blame] | 1105 | static int rpciod_start(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1106 | { |
| 1107 | struct workqueue_struct *wq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1108 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1109 | /* |
| 1110 | * Create the rpciod thread and wait for it to start. |
| 1111 | */ |
Trond Myklebust | ab418d7 | 2007-06-14 17:08:36 -0400 | [diff] [blame] | 1112 | dprintk("RPC: creating workqueue rpciod\n"); |
Trond Myklebust | 40a5f1b | 2016-05-27 10:39:50 -0400 | [diff] [blame] | 1113 | wq = alloc_workqueue("rpciod", WQ_MEM_RECLAIM, 0); |
| 1114 | if (!wq) |
| 1115 | goto out_failed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1116 | rpciod_workqueue = wq; |
Trond Myklebust | 40a5f1b | 2016-05-27 10:39:50 -0400 | [diff] [blame] | 1117 | /* Note: highpri because network receive is latency sensitive */ |
| 1118 | wq = alloc_workqueue("xprtiod", WQ_MEM_RECLAIM | WQ_HIGHPRI, 0); |
| 1119 | if (!wq) |
| 1120 | goto free_rpciod; |
| 1121 | xprtiod_workqueue = wq; |
| 1122 | return 1; |
| 1123 | free_rpciod: |
| 1124 | wq = rpciod_workqueue; |
| 1125 | rpciod_workqueue = NULL; |
| 1126 | destroy_workqueue(wq); |
| 1127 | out_failed: |
| 1128 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1129 | } |
| 1130 | |
Trond Myklebust | b247bbf | 2007-07-19 16:32:20 -0400 | [diff] [blame] | 1131 | static void rpciod_stop(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1132 | { |
Trond Myklebust | b247bbf | 2007-07-19 16:32:20 -0400 | [diff] [blame] | 1133 | struct workqueue_struct *wq = NULL; |
Trond Myklebust | ab418d7 | 2007-06-14 17:08:36 -0400 | [diff] [blame] | 1134 | |
Trond Myklebust | b247bbf | 2007-07-19 16:32:20 -0400 | [diff] [blame] | 1135 | if (rpciod_workqueue == NULL) |
| 1136 | return; |
Trond Myklebust | ab418d7 | 2007-06-14 17:08:36 -0400 | [diff] [blame] | 1137 | dprintk("RPC: destroying workqueue rpciod\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1138 | |
Trond Myklebust | b247bbf | 2007-07-19 16:32:20 -0400 | [diff] [blame] | 1139 | wq = rpciod_workqueue; |
| 1140 | rpciod_workqueue = NULL; |
| 1141 | destroy_workqueue(wq); |
Trond Myklebust | 40a5f1b | 2016-05-27 10:39:50 -0400 | [diff] [blame] | 1142 | wq = xprtiod_workqueue; |
| 1143 | xprtiod_workqueue = NULL; |
| 1144 | destroy_workqueue(wq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1145 | } |
| 1146 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1147 | void |
| 1148 | rpc_destroy_mempool(void) |
| 1149 | { |
Trond Myklebust | b247bbf | 2007-07-19 16:32:20 -0400 | [diff] [blame] | 1150 | rpciod_stop(); |
Julia Lawall | 17a9618 | 2015-09-13 14:15:07 +0200 | [diff] [blame] | 1151 | mempool_destroy(rpc_buffer_mempool); |
| 1152 | mempool_destroy(rpc_task_mempool); |
| 1153 | kmem_cache_destroy(rpc_task_slabp); |
| 1154 | kmem_cache_destroy(rpc_buffer_slabp); |
Trond Myklebust | f6a1cc8 | 2008-02-22 17:06:55 -0500 | [diff] [blame] | 1155 | rpc_destroy_wait_queue(&delay_queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1156 | } |
| 1157 | |
| 1158 | int |
| 1159 | rpc_init_mempool(void) |
| 1160 | { |
Trond Myklebust | f6a1cc8 | 2008-02-22 17:06:55 -0500 | [diff] [blame] | 1161 | /* |
| 1162 | * The following is not strictly a mempool initialisation, |
| 1163 | * but there is no harm in doing it here |
| 1164 | */ |
| 1165 | rpc_init_wait_queue(&delay_queue, "delayq"); |
| 1166 | if (!rpciod_start()) |
| 1167 | goto err_nomem; |
| 1168 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1169 | rpc_task_slabp = kmem_cache_create("rpc_tasks", |
| 1170 | sizeof(struct rpc_task), |
| 1171 | 0, SLAB_HWCACHE_ALIGN, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 1172 | NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1173 | if (!rpc_task_slabp) |
| 1174 | goto err_nomem; |
| 1175 | rpc_buffer_slabp = kmem_cache_create("rpc_buffers", |
| 1176 | RPC_BUFFER_MAXSIZE, |
| 1177 | 0, SLAB_HWCACHE_ALIGN, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 1178 | NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1179 | if (!rpc_buffer_slabp) |
| 1180 | goto err_nomem; |
Matthew Dobson | 93d2341 | 2006-03-26 01:37:50 -0800 | [diff] [blame] | 1181 | rpc_task_mempool = mempool_create_slab_pool(RPC_TASK_POOLSIZE, |
| 1182 | rpc_task_slabp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1183 | if (!rpc_task_mempool) |
| 1184 | goto err_nomem; |
Matthew Dobson | 93d2341 | 2006-03-26 01:37:50 -0800 | [diff] [blame] | 1185 | rpc_buffer_mempool = mempool_create_slab_pool(RPC_BUFFER_POOLSIZE, |
| 1186 | rpc_buffer_slabp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1187 | if (!rpc_buffer_mempool) |
| 1188 | goto err_nomem; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1189 | return 0; |
| 1190 | err_nomem: |
| 1191 | rpc_destroy_mempool(); |
| 1192 | return -ENOMEM; |
| 1193 | } |