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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/net/sunrpc/xprt.c | |
3 | * | |
4 | * This is a generic RPC call interface supporting congestion avoidance, | |
5 | * and asynchronous calls. | |
6 | * | |
7 | * The interface works like this: | |
8 | * | |
9 | * - When a process places a call, it allocates a request slot if | |
10 | * one is available. Otherwise, it sleeps on the backlog queue | |
11 | * (xprt_reserve). | |
12 | * - Next, the caller puts together the RPC message, stuffs it into | |
55aa4f58 CL |
13 | * the request struct, and calls xprt_transmit(). |
14 | * - xprt_transmit sends the message and installs the caller on the | |
55ae1aab RL |
15 | * transport's wait list. At the same time, if a reply is expected, |
16 | * it installs a timer that is run after the packet's timeout has | |
17 | * expired. | |
1da177e4 | 18 | * - When a packet arrives, the data_ready handler walks the list of |
55aa4f58 | 19 | * pending requests for that transport. If a matching XID is found, the |
1da177e4 LT |
20 | * caller is woken up, and the timer removed. |
21 | * - When no reply arrives within the timeout interval, the timer is | |
22 | * fired by the kernel and runs xprt_timer(). It either adjusts the | |
23 | * timeout values (minor timeout) or wakes up the caller with a status | |
24 | * of -ETIMEDOUT. | |
25 | * - When the caller receives a notification from RPC that a reply arrived, | |
26 | * it should release the RPC slot, and process the reply. | |
27 | * If the call timed out, it may choose to retry the operation by | |
28 | * adjusting the initial timeout value, and simply calling rpc_call | |
29 | * again. | |
30 | * | |
31 | * Support for async RPC is done through a set of RPC-specific scheduling | |
32 | * primitives that `transparently' work for processes as well as async | |
33 | * tasks that rely on callbacks. | |
34 | * | |
35 | * Copyright (C) 1995-1997, Olaf Kirch <okir@monad.swb.de> | |
55aa4f58 CL |
36 | * |
37 | * Transport switch API copyright (C) 2005, Chuck Lever <cel@netapp.com> | |
1da177e4 LT |
38 | */ |
39 | ||
a246b010 CL |
40 | #include <linux/module.h> |
41 | ||
1da177e4 | 42 | #include <linux/types.h> |
a246b010 | 43 | #include <linux/interrupt.h> |
1da177e4 | 44 | #include <linux/workqueue.h> |
bf3fcf89 | 45 | #include <linux/net.h> |
ff839970 | 46 | #include <linux/ktime.h> |
1da177e4 | 47 | |
a246b010 | 48 | #include <linux/sunrpc/clnt.h> |
11c556b3 | 49 | #include <linux/sunrpc/metrics.h> |
c9acb42e | 50 | #include <linux/sunrpc/bc_xprt.h> |
1da177e4 | 51 | |
3705ad64 JL |
52 | #include <trace/events/sunrpc.h> |
53 | ||
55ae1aab RL |
54 | #include "sunrpc.h" |
55 | ||
1da177e4 LT |
56 | /* |
57 | * Local variables | |
58 | */ | |
59 | ||
f895b252 | 60 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
1da177e4 LT |
61 | # define RPCDBG_FACILITY RPCDBG_XPRT |
62 | #endif | |
63 | ||
1da177e4 LT |
64 | /* |
65 | * Local functions | |
66 | */ | |
21de0a95 | 67 | static void xprt_init(struct rpc_xprt *xprt, struct net *net); |
1da177e4 | 68 | static void xprt_request_init(struct rpc_task *, struct rpc_xprt *); |
1da177e4 | 69 | static void xprt_connect_status(struct rpc_task *task); |
1da177e4 | 70 | static int __xprt_get_cong(struct rpc_xprt *, struct rpc_task *); |
29807318 | 71 | static void __xprt_put_cong(struct rpc_xprt *, struct rpc_rqst *); |
4e0038b6 | 72 | static void xprt_destroy(struct rpc_xprt *xprt); |
1da177e4 | 73 | |
5ba03e82 | 74 | static DEFINE_SPINLOCK(xprt_list_lock); |
81c098af TT |
75 | static LIST_HEAD(xprt_list); |
76 | ||
81c098af TT |
77 | /** |
78 | * xprt_register_transport - register a transport implementation | |
79 | * @transport: transport to register | |
80 | * | |
81 | * If a transport implementation is loaded as a kernel module, it can | |
82 | * call this interface to make itself known to the RPC client. | |
83 | * | |
84 | * Returns: | |
85 | * 0: transport successfully registered | |
86 | * -EEXIST: transport already registered | |
87 | * -EINVAL: transport module being unloaded | |
88 | */ | |
89 | int xprt_register_transport(struct xprt_class *transport) | |
90 | { | |
91 | struct xprt_class *t; | |
92 | int result; | |
93 | ||
94 | result = -EEXIST; | |
95 | spin_lock(&xprt_list_lock); | |
96 | list_for_each_entry(t, &xprt_list, list) { | |
97 | /* don't register the same transport class twice */ | |
4fa016eb | 98 | if (t->ident == transport->ident) |
81c098af TT |
99 | goto out; |
100 | } | |
101 | ||
c9f6cde6 DL |
102 | list_add_tail(&transport->list, &xprt_list); |
103 | printk(KERN_INFO "RPC: Registered %s transport module.\n", | |
104 | transport->name); | |
105 | result = 0; | |
81c098af TT |
106 | |
107 | out: | |
108 | spin_unlock(&xprt_list_lock); | |
109 | return result; | |
110 | } | |
111 | EXPORT_SYMBOL_GPL(xprt_register_transport); | |
112 | ||
113 | /** | |
114 | * xprt_unregister_transport - unregister a transport implementation | |
65b6e42c | 115 | * @transport: transport to unregister |
81c098af TT |
116 | * |
117 | * Returns: | |
118 | * 0: transport successfully unregistered | |
119 | * -ENOENT: transport never registered | |
120 | */ | |
121 | int xprt_unregister_transport(struct xprt_class *transport) | |
122 | { | |
123 | struct xprt_class *t; | |
124 | int result; | |
125 | ||
126 | result = 0; | |
127 | spin_lock(&xprt_list_lock); | |
128 | list_for_each_entry(t, &xprt_list, list) { | |
129 | if (t == transport) { | |
130 | printk(KERN_INFO | |
131 | "RPC: Unregistered %s transport module.\n", | |
132 | transport->name); | |
133 | list_del_init(&transport->list); | |
81c098af TT |
134 | goto out; |
135 | } | |
136 | } | |
137 | result = -ENOENT; | |
138 | ||
139 | out: | |
140 | spin_unlock(&xprt_list_lock); | |
141 | return result; | |
142 | } | |
143 | EXPORT_SYMBOL_GPL(xprt_unregister_transport); | |
144 | ||
441e3e24 TT |
145 | /** |
146 | * xprt_load_transport - load a transport implementation | |
147 | * @transport_name: transport to load | |
148 | * | |
149 | * Returns: | |
150 | * 0: transport successfully loaded | |
151 | * -ENOENT: transport module not available | |
152 | */ | |
153 | int xprt_load_transport(const char *transport_name) | |
154 | { | |
155 | struct xprt_class *t; | |
441e3e24 TT |
156 | int result; |
157 | ||
158 | result = 0; | |
159 | spin_lock(&xprt_list_lock); | |
160 | list_for_each_entry(t, &xprt_list, list) { | |
161 | if (strcmp(t->name, transport_name) == 0) { | |
162 | spin_unlock(&xprt_list_lock); | |
163 | goto out; | |
164 | } | |
165 | } | |
166 | spin_unlock(&xprt_list_lock); | |
ef7ffe8f | 167 | result = request_module("xprt%s", transport_name); |
441e3e24 TT |
168 | out: |
169 | return result; | |
170 | } | |
171 | EXPORT_SYMBOL_GPL(xprt_load_transport); | |
172 | ||
12a80469 CL |
173 | /** |
174 | * xprt_reserve_xprt - serialize write access to transports | |
175 | * @task: task that is requesting access to the transport | |
177c27bf | 176 | * @xprt: pointer to the target transport |
12a80469 CL |
177 | * |
178 | * This prevents mixing the payload of separate requests, and prevents | |
179 | * transport connects from colliding with writes. No congestion control | |
180 | * is provided. | |
181 | */ | |
43cedbf0 | 182 | int xprt_reserve_xprt(struct rpc_xprt *xprt, struct rpc_task *task) |
12a80469 | 183 | { |
12a80469 | 184 | struct rpc_rqst *req = task->tk_rqstp; |
34006cee | 185 | int priority; |
12a80469 CL |
186 | |
187 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) { | |
188 | if (task == xprt->snd_task) | |
189 | return 1; | |
12a80469 CL |
190 | goto out_sleep; |
191 | } | |
192 | xprt->snd_task = task; | |
92551948 | 193 | if (req != NULL) |
43cedbf0 | 194 | req->rq_ntrans++; |
4d4a76f3 | 195 | |
12a80469 CL |
196 | return 1; |
197 | ||
198 | out_sleep: | |
46121cf7 | 199 | dprintk("RPC: %5u failed to lock transport %p\n", |
12a80469 CL |
200 | task->tk_pid, xprt); |
201 | task->tk_timeout = 0; | |
202 | task->tk_status = -EAGAIN; | |
34006cee TM |
203 | if (req == NULL) |
204 | priority = RPC_PRIORITY_LOW; | |
205 | else if (!req->rq_ntrans) | |
206 | priority = RPC_PRIORITY_NORMAL; | |
12a80469 | 207 | else |
34006cee TM |
208 | priority = RPC_PRIORITY_HIGH; |
209 | rpc_sleep_on_priority(&xprt->sending, task, NULL, priority); | |
12a80469 CL |
210 | return 0; |
211 | } | |
12444809 | 212 | EXPORT_SYMBOL_GPL(xprt_reserve_xprt); |
12a80469 | 213 | |
632e3bdc TM |
214 | static void xprt_clear_locked(struct rpc_xprt *xprt) |
215 | { | |
216 | xprt->snd_task = NULL; | |
d19751e7 | 217 | if (!test_bit(XPRT_CLOSE_WAIT, &xprt->state)) { |
4e857c58 | 218 | smp_mb__before_atomic(); |
632e3bdc | 219 | clear_bit(XPRT_LOCKED, &xprt->state); |
4e857c58 | 220 | smp_mb__after_atomic(); |
632e3bdc | 221 | } else |
c1384c9c | 222 | queue_work(rpciod_workqueue, &xprt->task_cleanup); |
632e3bdc TM |
223 | } |
224 | ||
1da177e4 | 225 | /* |
12a80469 CL |
226 | * xprt_reserve_xprt_cong - serialize write access to transports |
227 | * @task: task that is requesting access to the transport | |
228 | * | |
229 | * Same as xprt_reserve_xprt, but Van Jacobson congestion control is | |
230 | * integrated into the decision of whether a request is allowed to be | |
231 | * woken up and given access to the transport. | |
1da177e4 | 232 | */ |
43cedbf0 | 233 | int xprt_reserve_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task) |
1da177e4 LT |
234 | { |
235 | struct rpc_rqst *req = task->tk_rqstp; | |
34006cee | 236 | int priority; |
1da177e4 | 237 | |
2226feb6 | 238 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) { |
1da177e4 LT |
239 | if (task == xprt->snd_task) |
240 | return 1; | |
1da177e4 LT |
241 | goto out_sleep; |
242 | } | |
43cedbf0 TM |
243 | if (req == NULL) { |
244 | xprt->snd_task = task; | |
245 | return 1; | |
246 | } | |
12a80469 | 247 | if (__xprt_get_cong(xprt, task)) { |
1da177e4 | 248 | xprt->snd_task = task; |
43cedbf0 | 249 | req->rq_ntrans++; |
1da177e4 LT |
250 | return 1; |
251 | } | |
632e3bdc | 252 | xprt_clear_locked(xprt); |
1da177e4 | 253 | out_sleep: |
29807318 NB |
254 | if (req) |
255 | __xprt_put_cong(xprt, req); | |
46121cf7 | 256 | dprintk("RPC: %5u failed to lock transport %p\n", task->tk_pid, xprt); |
1da177e4 LT |
257 | task->tk_timeout = 0; |
258 | task->tk_status = -EAGAIN; | |
34006cee TM |
259 | if (req == NULL) |
260 | priority = RPC_PRIORITY_LOW; | |
261 | else if (!req->rq_ntrans) | |
262 | priority = RPC_PRIORITY_NORMAL; | |
1da177e4 | 263 | else |
34006cee TM |
264 | priority = RPC_PRIORITY_HIGH; |
265 | rpc_sleep_on_priority(&xprt->sending, task, NULL, priority); | |
1da177e4 LT |
266 | return 0; |
267 | } | |
12444809 | 268 | EXPORT_SYMBOL_GPL(xprt_reserve_xprt_cong); |
1da177e4 | 269 | |
12a80469 | 270 | static inline int xprt_lock_write(struct rpc_xprt *xprt, struct rpc_task *task) |
1da177e4 LT |
271 | { |
272 | int retval; | |
273 | ||
4a0f8c04 | 274 | spin_lock_bh(&xprt->transport_lock); |
43cedbf0 | 275 | retval = xprt->ops->reserve_xprt(xprt, task); |
4a0f8c04 | 276 | spin_unlock_bh(&xprt->transport_lock); |
1da177e4 LT |
277 | return retval; |
278 | } | |
279 | ||
961a828d | 280 | static bool __xprt_lock_write_func(struct rpc_task *task, void *data) |
49e9a890 | 281 | { |
961a828d | 282 | struct rpc_xprt *xprt = data; |
49e9a890 CL |
283 | struct rpc_rqst *req; |
284 | ||
49e9a890 CL |
285 | req = task->tk_rqstp; |
286 | xprt->snd_task = task; | |
92551948 | 287 | if (req) |
49e9a890 | 288 | req->rq_ntrans++; |
961a828d TM |
289 | return true; |
290 | } | |
49e9a890 | 291 | |
961a828d TM |
292 | static void __xprt_lock_write_next(struct rpc_xprt *xprt) |
293 | { | |
294 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) | |
295 | return; | |
296 | ||
297 | if (rpc_wake_up_first(&xprt->sending, __xprt_lock_write_func, xprt)) | |
298 | return; | |
632e3bdc | 299 | xprt_clear_locked(xprt); |
49e9a890 CL |
300 | } |
301 | ||
961a828d | 302 | static bool __xprt_lock_write_cong_func(struct rpc_task *task, void *data) |
1da177e4 | 303 | { |
961a828d | 304 | struct rpc_xprt *xprt = data; |
43cedbf0 | 305 | struct rpc_rqst *req; |
1da177e4 | 306 | |
43cedbf0 TM |
307 | req = task->tk_rqstp; |
308 | if (req == NULL) { | |
309 | xprt->snd_task = task; | |
961a828d | 310 | return true; |
43cedbf0 | 311 | } |
49e9a890 | 312 | if (__xprt_get_cong(xprt, task)) { |
1da177e4 | 313 | xprt->snd_task = task; |
43cedbf0 | 314 | req->rq_ntrans++; |
961a828d | 315 | return true; |
1da177e4 | 316 | } |
961a828d TM |
317 | return false; |
318 | } | |
319 | ||
320 | static void __xprt_lock_write_next_cong(struct rpc_xprt *xprt) | |
321 | { | |
322 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) | |
323 | return; | |
324 | if (RPCXPRT_CONGESTED(xprt)) | |
325 | goto out_unlock; | |
326 | if (rpc_wake_up_first(&xprt->sending, __xprt_lock_write_cong_func, xprt)) | |
327 | return; | |
1da177e4 | 328 | out_unlock: |
632e3bdc | 329 | xprt_clear_locked(xprt); |
1da177e4 LT |
330 | } |
331 | ||
0695314e TM |
332 | static void xprt_task_clear_bytes_sent(struct rpc_task *task) |
333 | { | |
334 | if (task != NULL) { | |
335 | struct rpc_rqst *req = task->tk_rqstp; | |
336 | if (req != NULL) | |
337 | req->rq_bytes_sent = 0; | |
338 | } | |
339 | } | |
340 | ||
49e9a890 CL |
341 | /** |
342 | * xprt_release_xprt - allow other requests to use a transport | |
343 | * @xprt: transport with other tasks potentially waiting | |
344 | * @task: task that is releasing access to the transport | |
345 | * | |
346 | * Note that "task" can be NULL. No congestion control is provided. | |
1da177e4 | 347 | */ |
49e9a890 | 348 | void xprt_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) |
1da177e4 LT |
349 | { |
350 | if (xprt->snd_task == task) { | |
0695314e | 351 | xprt_task_clear_bytes_sent(task); |
632e3bdc | 352 | xprt_clear_locked(xprt); |
1da177e4 LT |
353 | __xprt_lock_write_next(xprt); |
354 | } | |
355 | } | |
12444809 | 356 | EXPORT_SYMBOL_GPL(xprt_release_xprt); |
1da177e4 | 357 | |
49e9a890 CL |
358 | /** |
359 | * xprt_release_xprt_cong - allow other requests to use a transport | |
360 | * @xprt: transport with other tasks potentially waiting | |
361 | * @task: task that is releasing access to the transport | |
362 | * | |
363 | * Note that "task" can be NULL. Another task is awoken to use the | |
364 | * transport if the transport's congestion window allows it. | |
365 | */ | |
366 | void xprt_release_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task) | |
367 | { | |
368 | if (xprt->snd_task == task) { | |
0695314e | 369 | xprt_task_clear_bytes_sent(task); |
632e3bdc | 370 | xprt_clear_locked(xprt); |
49e9a890 CL |
371 | __xprt_lock_write_next_cong(xprt); |
372 | } | |
373 | } | |
12444809 | 374 | EXPORT_SYMBOL_GPL(xprt_release_xprt_cong); |
49e9a890 CL |
375 | |
376 | static inline void xprt_release_write(struct rpc_xprt *xprt, struct rpc_task *task) | |
1da177e4 | 377 | { |
4a0f8c04 | 378 | spin_lock_bh(&xprt->transport_lock); |
49e9a890 | 379 | xprt->ops->release_xprt(xprt, task); |
4a0f8c04 | 380 | spin_unlock_bh(&xprt->transport_lock); |
1da177e4 LT |
381 | } |
382 | ||
1da177e4 LT |
383 | /* |
384 | * Van Jacobson congestion avoidance. Check if the congestion window | |
385 | * overflowed. Put the task to sleep if this is the case. | |
386 | */ | |
387 | static int | |
388 | __xprt_get_cong(struct rpc_xprt *xprt, struct rpc_task *task) | |
389 | { | |
390 | struct rpc_rqst *req = task->tk_rqstp; | |
391 | ||
392 | if (req->rq_cong) | |
393 | return 1; | |
46121cf7 | 394 | dprintk("RPC: %5u xprt_cwnd_limited cong = %lu cwnd = %lu\n", |
1da177e4 LT |
395 | task->tk_pid, xprt->cong, xprt->cwnd); |
396 | if (RPCXPRT_CONGESTED(xprt)) | |
397 | return 0; | |
398 | req->rq_cong = 1; | |
399 | xprt->cong += RPC_CWNDSCALE; | |
400 | return 1; | |
401 | } | |
402 | ||
403 | /* | |
404 | * Adjust the congestion window, and wake up the next task | |
405 | * that has been sleeping due to congestion | |
406 | */ | |
407 | static void | |
408 | __xprt_put_cong(struct rpc_xprt *xprt, struct rpc_rqst *req) | |
409 | { | |
410 | if (!req->rq_cong) | |
411 | return; | |
412 | req->rq_cong = 0; | |
413 | xprt->cong -= RPC_CWNDSCALE; | |
49e9a890 | 414 | __xprt_lock_write_next_cong(xprt); |
1da177e4 LT |
415 | } |
416 | ||
a58dd398 CL |
417 | /** |
418 | * xprt_release_rqst_cong - housekeeping when request is complete | |
419 | * @task: RPC request that recently completed | |
420 | * | |
421 | * Useful for transports that require congestion control. | |
422 | */ | |
423 | void xprt_release_rqst_cong(struct rpc_task *task) | |
424 | { | |
a4f0835c TM |
425 | struct rpc_rqst *req = task->tk_rqstp; |
426 | ||
427 | __xprt_put_cong(req->rq_xprt, req); | |
a58dd398 | 428 | } |
12444809 | 429 | EXPORT_SYMBOL_GPL(xprt_release_rqst_cong); |
a58dd398 | 430 | |
46c0ee8b CL |
431 | /** |
432 | * xprt_adjust_cwnd - adjust transport congestion window | |
6a24dfb6 | 433 | * @xprt: pointer to xprt |
46c0ee8b CL |
434 | * @task: recently completed RPC request used to adjust window |
435 | * @result: result code of completed RPC request | |
436 | * | |
4f4cf5ad CL |
437 | * The transport code maintains an estimate on the maximum number of out- |
438 | * standing RPC requests, using a smoothed version of the congestion | |
439 | * avoidance implemented in 44BSD. This is basically the Van Jacobson | |
440 | * congestion algorithm: If a retransmit occurs, the congestion window is | |
441 | * halved; otherwise, it is incremented by 1/cwnd when | |
442 | * | |
443 | * - a reply is received and | |
444 | * - a full number of requests are outstanding and | |
445 | * - the congestion window hasn't been updated recently. | |
1da177e4 | 446 | */ |
6a24dfb6 | 447 | void xprt_adjust_cwnd(struct rpc_xprt *xprt, struct rpc_task *task, int result) |
1da177e4 | 448 | { |
46c0ee8b | 449 | struct rpc_rqst *req = task->tk_rqstp; |
46c0ee8b | 450 | unsigned long cwnd = xprt->cwnd; |
1da177e4 | 451 | |
1da177e4 LT |
452 | if (result >= 0 && cwnd <= xprt->cong) { |
453 | /* The (cwnd >> 1) term makes sure | |
454 | * the result gets rounded properly. */ | |
455 | cwnd += (RPC_CWNDSCALE * RPC_CWNDSCALE + (cwnd >> 1)) / cwnd; | |
456 | if (cwnd > RPC_MAXCWND(xprt)) | |
457 | cwnd = RPC_MAXCWND(xprt); | |
49e9a890 | 458 | __xprt_lock_write_next_cong(xprt); |
1da177e4 LT |
459 | } else if (result == -ETIMEDOUT) { |
460 | cwnd >>= 1; | |
461 | if (cwnd < RPC_CWNDSCALE) | |
462 | cwnd = RPC_CWNDSCALE; | |
463 | } | |
46121cf7 | 464 | dprintk("RPC: cong %ld, cwnd was %ld, now %ld\n", |
1da177e4 LT |
465 | xprt->cong, xprt->cwnd, cwnd); |
466 | xprt->cwnd = cwnd; | |
46c0ee8b | 467 | __xprt_put_cong(xprt, req); |
1da177e4 | 468 | } |
12444809 | 469 | EXPORT_SYMBOL_GPL(xprt_adjust_cwnd); |
1da177e4 | 470 | |
44fbac22 CL |
471 | /** |
472 | * xprt_wake_pending_tasks - wake all tasks on a transport's pending queue | |
473 | * @xprt: transport with waiting tasks | |
474 | * @status: result code to plant in each task before waking it | |
475 | * | |
476 | */ | |
477 | void xprt_wake_pending_tasks(struct rpc_xprt *xprt, int status) | |
478 | { | |
479 | if (status < 0) | |
480 | rpc_wake_up_status(&xprt->pending, status); | |
481 | else | |
482 | rpc_wake_up(&xprt->pending); | |
483 | } | |
12444809 | 484 | EXPORT_SYMBOL_GPL(xprt_wake_pending_tasks); |
44fbac22 | 485 | |
c7b2cae8 CL |
486 | /** |
487 | * xprt_wait_for_buffer_space - wait for transport output buffer to clear | |
488 | * @task: task to be put to sleep | |
0b80ae42 | 489 | * @action: function pointer to be executed after wait |
a9a6b52e TM |
490 | * |
491 | * Note that we only set the timer for the case of RPC_IS_SOFT(), since | |
492 | * we don't in general want to force a socket disconnection due to | |
493 | * an incomplete RPC call transmission. | |
c7b2cae8 | 494 | */ |
b6ddf64f | 495 | void xprt_wait_for_buffer_space(struct rpc_task *task, rpc_action action) |
c7b2cae8 CL |
496 | { |
497 | struct rpc_rqst *req = task->tk_rqstp; | |
498 | struct rpc_xprt *xprt = req->rq_xprt; | |
499 | ||
a9a6b52e | 500 | task->tk_timeout = RPC_IS_SOFT(task) ? req->rq_timeout : 0; |
b6ddf64f | 501 | rpc_sleep_on(&xprt->pending, task, action); |
c7b2cae8 | 502 | } |
12444809 | 503 | EXPORT_SYMBOL_GPL(xprt_wait_for_buffer_space); |
c7b2cae8 CL |
504 | |
505 | /** | |
506 | * xprt_write_space - wake the task waiting for transport output buffer space | |
507 | * @xprt: transport with waiting tasks | |
508 | * | |
509 | * Can be called in a soft IRQ context, so xprt_write_space never sleeps. | |
510 | */ | |
511 | void xprt_write_space(struct rpc_xprt *xprt) | |
512 | { | |
c7b2cae8 CL |
513 | spin_lock_bh(&xprt->transport_lock); |
514 | if (xprt->snd_task) { | |
46121cf7 CL |
515 | dprintk("RPC: write space: waking waiting task on " |
516 | "xprt %p\n", xprt); | |
fda13939 | 517 | rpc_wake_up_queued_task(&xprt->pending, xprt->snd_task); |
c7b2cae8 CL |
518 | } |
519 | spin_unlock_bh(&xprt->transport_lock); | |
520 | } | |
12444809 | 521 | EXPORT_SYMBOL_GPL(xprt_write_space); |
c7b2cae8 | 522 | |
fe3aca29 CL |
523 | /** |
524 | * xprt_set_retrans_timeout_def - set a request's retransmit timeout | |
525 | * @task: task whose timeout is to be set | |
526 | * | |
527 | * Set a request's retransmit timeout based on the transport's | |
528 | * default timeout parameters. Used by transports that don't adjust | |
529 | * the retransmit timeout based on round-trip time estimation. | |
530 | */ | |
531 | void xprt_set_retrans_timeout_def(struct rpc_task *task) | |
532 | { | |
533 | task->tk_timeout = task->tk_rqstp->rq_timeout; | |
534 | } | |
12444809 | 535 | EXPORT_SYMBOL_GPL(xprt_set_retrans_timeout_def); |
fe3aca29 | 536 | |
2c53040f | 537 | /** |
fe3aca29 CL |
538 | * xprt_set_retrans_timeout_rtt - set a request's retransmit timeout |
539 | * @task: task whose timeout is to be set | |
cca5172a | 540 | * |
fe3aca29 CL |
541 | * Set a request's retransmit timeout using the RTT estimator. |
542 | */ | |
543 | void xprt_set_retrans_timeout_rtt(struct rpc_task *task) | |
544 | { | |
545 | int timer = task->tk_msg.rpc_proc->p_timer; | |
ba7392bb TM |
546 | struct rpc_clnt *clnt = task->tk_client; |
547 | struct rpc_rtt *rtt = clnt->cl_rtt; | |
fe3aca29 | 548 | struct rpc_rqst *req = task->tk_rqstp; |
ba7392bb | 549 | unsigned long max_timeout = clnt->cl_timeout->to_maxval; |
fe3aca29 CL |
550 | |
551 | task->tk_timeout = rpc_calc_rto(rtt, timer); | |
552 | task->tk_timeout <<= rpc_ntimeo(rtt, timer) + req->rq_retries; | |
553 | if (task->tk_timeout > max_timeout || task->tk_timeout == 0) | |
554 | task->tk_timeout = max_timeout; | |
555 | } | |
12444809 | 556 | EXPORT_SYMBOL_GPL(xprt_set_retrans_timeout_rtt); |
fe3aca29 | 557 | |
1da177e4 LT |
558 | static void xprt_reset_majortimeo(struct rpc_rqst *req) |
559 | { | |
ba7392bb | 560 | const struct rpc_timeout *to = req->rq_task->tk_client->cl_timeout; |
1da177e4 LT |
561 | |
562 | req->rq_majortimeo = req->rq_timeout; | |
563 | if (to->to_exponential) | |
564 | req->rq_majortimeo <<= to->to_retries; | |
565 | else | |
566 | req->rq_majortimeo += to->to_increment * to->to_retries; | |
567 | if (req->rq_majortimeo > to->to_maxval || req->rq_majortimeo == 0) | |
568 | req->rq_majortimeo = to->to_maxval; | |
569 | req->rq_majortimeo += jiffies; | |
570 | } | |
571 | ||
9903cd1c CL |
572 | /** |
573 | * xprt_adjust_timeout - adjust timeout values for next retransmit | |
574 | * @req: RPC request containing parameters to use for the adjustment | |
575 | * | |
1da177e4 LT |
576 | */ |
577 | int xprt_adjust_timeout(struct rpc_rqst *req) | |
578 | { | |
579 | struct rpc_xprt *xprt = req->rq_xprt; | |
ba7392bb | 580 | const struct rpc_timeout *to = req->rq_task->tk_client->cl_timeout; |
1da177e4 LT |
581 | int status = 0; |
582 | ||
583 | if (time_before(jiffies, req->rq_majortimeo)) { | |
584 | if (to->to_exponential) | |
585 | req->rq_timeout <<= 1; | |
586 | else | |
587 | req->rq_timeout += to->to_increment; | |
588 | if (to->to_maxval && req->rq_timeout >= to->to_maxval) | |
589 | req->rq_timeout = to->to_maxval; | |
590 | req->rq_retries++; | |
1da177e4 LT |
591 | } else { |
592 | req->rq_timeout = to->to_initval; | |
593 | req->rq_retries = 0; | |
594 | xprt_reset_majortimeo(req); | |
595 | /* Reset the RTT counters == "slow start" */ | |
4a0f8c04 | 596 | spin_lock_bh(&xprt->transport_lock); |
1da177e4 | 597 | rpc_init_rtt(req->rq_task->tk_client->cl_rtt, to->to_initval); |
4a0f8c04 | 598 | spin_unlock_bh(&xprt->transport_lock); |
1da177e4 LT |
599 | status = -ETIMEDOUT; |
600 | } | |
601 | ||
602 | if (req->rq_timeout == 0) { | |
603 | printk(KERN_WARNING "xprt_adjust_timeout: rq_timeout = 0!\n"); | |
604 | req->rq_timeout = 5 * HZ; | |
605 | } | |
606 | return status; | |
607 | } | |
608 | ||
65f27f38 | 609 | static void xprt_autoclose(struct work_struct *work) |
1da177e4 | 610 | { |
65f27f38 DH |
611 | struct rpc_xprt *xprt = |
612 | container_of(work, struct rpc_xprt, task_cleanup); | |
1da177e4 | 613 | |
66af1e55 | 614 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
4876cc77 | 615 | xprt->ops->close(xprt); |
1da177e4 | 616 | xprt_release_write(xprt, NULL); |
79234c3d | 617 | wake_up_bit(&xprt->state, XPRT_LOCKED); |
1da177e4 LT |
618 | } |
619 | ||
9903cd1c | 620 | /** |
62da3b24 | 621 | * xprt_disconnect_done - mark a transport as disconnected |
9903cd1c CL |
622 | * @xprt: transport to flag for disconnect |
623 | * | |
1da177e4 | 624 | */ |
62da3b24 | 625 | void xprt_disconnect_done(struct rpc_xprt *xprt) |
1da177e4 | 626 | { |
46121cf7 | 627 | dprintk("RPC: disconnected transport %p\n", xprt); |
4a0f8c04 | 628 | spin_lock_bh(&xprt->transport_lock); |
1da177e4 | 629 | xprt_clear_connected(xprt); |
2a491991 | 630 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
4a0f8c04 | 631 | spin_unlock_bh(&xprt->transport_lock); |
1da177e4 | 632 | } |
62da3b24 | 633 | EXPORT_SYMBOL_GPL(xprt_disconnect_done); |
1da177e4 | 634 | |
66af1e55 TM |
635 | /** |
636 | * xprt_force_disconnect - force a transport to disconnect | |
637 | * @xprt: transport to disconnect | |
638 | * | |
639 | */ | |
640 | void xprt_force_disconnect(struct rpc_xprt *xprt) | |
641 | { | |
642 | /* Don't race with the test_bit() in xprt_clear_locked() */ | |
643 | spin_lock_bh(&xprt->transport_lock); | |
644 | set_bit(XPRT_CLOSE_WAIT, &xprt->state); | |
645 | /* Try to schedule an autoclose RPC call */ | |
646 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0) | |
647 | queue_work(rpciod_workqueue, &xprt->task_cleanup); | |
2a491991 | 648 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
66af1e55 TM |
649 | spin_unlock_bh(&xprt->transport_lock); |
650 | } | |
66af1e55 | 651 | |
7c1d71cf TM |
652 | /** |
653 | * xprt_conditional_disconnect - force a transport to disconnect | |
654 | * @xprt: transport to disconnect | |
655 | * @cookie: 'connection cookie' | |
656 | * | |
657 | * This attempts to break the connection if and only if 'cookie' matches | |
658 | * the current transport 'connection cookie'. It ensures that we don't | |
659 | * try to break the connection more than once when we need to retransmit | |
660 | * a batch of RPC requests. | |
661 | * | |
662 | */ | |
663 | void xprt_conditional_disconnect(struct rpc_xprt *xprt, unsigned int cookie) | |
664 | { | |
665 | /* Don't race with the test_bit() in xprt_clear_locked() */ | |
666 | spin_lock_bh(&xprt->transport_lock); | |
667 | if (cookie != xprt->connect_cookie) | |
668 | goto out; | |
669 | if (test_bit(XPRT_CLOSING, &xprt->state) || !xprt_connected(xprt)) | |
670 | goto out; | |
671 | set_bit(XPRT_CLOSE_WAIT, &xprt->state); | |
672 | /* Try to schedule an autoclose RPC call */ | |
673 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0) | |
674 | queue_work(rpciod_workqueue, &xprt->task_cleanup); | |
2a491991 | 675 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
7c1d71cf TM |
676 | out: |
677 | spin_unlock_bh(&xprt->transport_lock); | |
678 | } | |
679 | ||
1da177e4 LT |
680 | static void |
681 | xprt_init_autodisconnect(unsigned long data) | |
682 | { | |
683 | struct rpc_xprt *xprt = (struct rpc_xprt *)data; | |
684 | ||
4a0f8c04 | 685 | spin_lock(&xprt->transport_lock); |
d19751e7 | 686 | if (!list_empty(&xprt->recv)) |
1da177e4 | 687 | goto out_abort; |
2226feb6 | 688 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) |
1da177e4 | 689 | goto out_abort; |
4a0f8c04 | 690 | spin_unlock(&xprt->transport_lock); |
f75e6745 | 691 | queue_work(rpciod_workqueue, &xprt->task_cleanup); |
1da177e4 LT |
692 | return; |
693 | out_abort: | |
4a0f8c04 | 694 | spin_unlock(&xprt->transport_lock); |
1da177e4 LT |
695 | } |
696 | ||
718ba5b8 TM |
697 | bool xprt_lock_connect(struct rpc_xprt *xprt, |
698 | struct rpc_task *task, | |
699 | void *cookie) | |
700 | { | |
701 | bool ret = false; | |
702 | ||
703 | spin_lock_bh(&xprt->transport_lock); | |
704 | if (!test_bit(XPRT_LOCKED, &xprt->state)) | |
705 | goto out; | |
706 | if (xprt->snd_task != task) | |
707 | goto out; | |
0695314e | 708 | xprt_task_clear_bytes_sent(task); |
718ba5b8 TM |
709 | xprt->snd_task = cookie; |
710 | ret = true; | |
711 | out: | |
712 | spin_unlock_bh(&xprt->transport_lock); | |
713 | return ret; | |
714 | } | |
715 | ||
716 | void xprt_unlock_connect(struct rpc_xprt *xprt, void *cookie) | |
717 | { | |
718 | spin_lock_bh(&xprt->transport_lock); | |
719 | if (xprt->snd_task != cookie) | |
720 | goto out; | |
721 | if (!test_bit(XPRT_LOCKED, &xprt->state)) | |
722 | goto out; | |
723 | xprt->snd_task =NULL; | |
724 | xprt->ops->release_xprt(xprt, NULL); | |
725 | out: | |
726 | spin_unlock_bh(&xprt->transport_lock); | |
79234c3d | 727 | wake_up_bit(&xprt->state, XPRT_LOCKED); |
718ba5b8 TM |
728 | } |
729 | ||
9903cd1c CL |
730 | /** |
731 | * xprt_connect - schedule a transport connect operation | |
732 | * @task: RPC task that is requesting the connect | |
1da177e4 LT |
733 | * |
734 | */ | |
735 | void xprt_connect(struct rpc_task *task) | |
736 | { | |
ad2368d6 | 737 | struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt; |
1da177e4 | 738 | |
46121cf7 | 739 | dprintk("RPC: %5u xprt_connect xprt %p %s connected\n", task->tk_pid, |
1da177e4 LT |
740 | xprt, (xprt_connected(xprt) ? "is" : "is not")); |
741 | ||
ec739ef0 | 742 | if (!xprt_bound(xprt)) { |
01d37c42 | 743 | task->tk_status = -EAGAIN; |
1da177e4 LT |
744 | return; |
745 | } | |
746 | if (!xprt_lock_write(xprt, task)) | |
747 | return; | |
feb8ca37 TM |
748 | |
749 | if (test_and_clear_bit(XPRT_CLOSE_WAIT, &xprt->state)) | |
750 | xprt->ops->close(xprt); | |
751 | ||
718ba5b8 | 752 | if (!xprt_connected(xprt)) { |
87e3c055 | 753 | task->tk_rqstp->rq_bytes_sent = 0; |
a8ce4a8f | 754 | task->tk_timeout = task->tk_rqstp->rq_timeout; |
5d00837b | 755 | rpc_sleep_on(&xprt->pending, task, xprt_connect_status); |
0b9e7943 TM |
756 | |
757 | if (test_bit(XPRT_CLOSING, &xprt->state)) | |
758 | return; | |
759 | if (xprt_test_and_set_connecting(xprt)) | |
760 | return; | |
262ca07d | 761 | xprt->stat.connect_start = jiffies; |
1b092092 | 762 | xprt->ops->connect(xprt, task); |
1da177e4 | 763 | } |
718ba5b8 | 764 | xprt_release_write(xprt, task); |
1da177e4 LT |
765 | } |
766 | ||
9903cd1c | 767 | static void xprt_connect_status(struct rpc_task *task) |
1da177e4 | 768 | { |
ad2368d6 | 769 | struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt; |
1da177e4 | 770 | |
cd983ef8 | 771 | if (task->tk_status == 0) { |
262ca07d CL |
772 | xprt->stat.connect_count++; |
773 | xprt->stat.connect_time += (long)jiffies - xprt->stat.connect_start; | |
46121cf7 | 774 | dprintk("RPC: %5u xprt_connect_status: connection established\n", |
1da177e4 LT |
775 | task->tk_pid); |
776 | return; | |
777 | } | |
778 | ||
1da177e4 | 779 | switch (task->tk_status) { |
0fe8d04e TM |
780 | case -ECONNREFUSED: |
781 | case -ECONNRESET: | |
782 | case -ECONNABORTED: | |
783 | case -ENETUNREACH: | |
784 | case -EHOSTUNREACH: | |
2fc193cf | 785 | case -EPIPE: |
2a491991 TM |
786 | case -EAGAIN: |
787 | dprintk("RPC: %5u xprt_connect_status: retrying\n", task->tk_pid); | |
23475d66 | 788 | break; |
1da177e4 | 789 | case -ETIMEDOUT: |
46121cf7 CL |
790 | dprintk("RPC: %5u xprt_connect_status: connect attempt timed " |
791 | "out\n", task->tk_pid); | |
1da177e4 LT |
792 | break; |
793 | default: | |
46121cf7 CL |
794 | dprintk("RPC: %5u xprt_connect_status: error %d connecting to " |
795 | "server %s\n", task->tk_pid, -task->tk_status, | |
4e0038b6 | 796 | xprt->servername); |
23475d66 | 797 | task->tk_status = -EIO; |
1da177e4 | 798 | } |
1da177e4 LT |
799 | } |
800 | ||
9903cd1c CL |
801 | /** |
802 | * xprt_lookup_rqst - find an RPC request corresponding to an XID | |
803 | * @xprt: transport on which the original request was transmitted | |
804 | * @xid: RPC XID of incoming reply | |
805 | * | |
1da177e4 | 806 | */ |
d8ed029d | 807 | struct rpc_rqst *xprt_lookup_rqst(struct rpc_xprt *xprt, __be32 xid) |
1da177e4 | 808 | { |
8f3a6de3 | 809 | struct rpc_rqst *entry; |
1da177e4 | 810 | |
8f3a6de3 | 811 | list_for_each_entry(entry, &xprt->recv, rq_list) |
3705ad64 JL |
812 | if (entry->rq_xid == xid) { |
813 | trace_xprt_lookup_rqst(xprt, xid, 0); | |
262ca07d | 814 | return entry; |
3705ad64 | 815 | } |
46121cf7 CL |
816 | |
817 | dprintk("RPC: xprt_lookup_rqst did not find xid %08x\n", | |
818 | ntohl(xid)); | |
3705ad64 | 819 | trace_xprt_lookup_rqst(xprt, xid, -ENOENT); |
262ca07d CL |
820 | xprt->stat.bad_xids++; |
821 | return NULL; | |
1da177e4 | 822 | } |
12444809 | 823 | EXPORT_SYMBOL_GPL(xprt_lookup_rqst); |
1da177e4 | 824 | |
bbc72cea | 825 | static void xprt_update_rtt(struct rpc_task *task) |
1570c1e4 CL |
826 | { |
827 | struct rpc_rqst *req = task->tk_rqstp; | |
828 | struct rpc_rtt *rtt = task->tk_client->cl_rtt; | |
95c96174 | 829 | unsigned int timer = task->tk_msg.rpc_proc->p_timer; |
d60dbb20 | 830 | long m = usecs_to_jiffies(ktime_to_us(req->rq_rtt)); |
1570c1e4 CL |
831 | |
832 | if (timer) { | |
833 | if (req->rq_ntrans == 1) | |
ff839970 | 834 | rpc_update_rtt(rtt, timer, m); |
1570c1e4 CL |
835 | rpc_set_timeo(rtt, timer, req->rq_ntrans - 1); |
836 | } | |
837 | } | |
838 | ||
9903cd1c CL |
839 | /** |
840 | * xprt_complete_rqst - called when reply processing is complete | |
1570c1e4 | 841 | * @task: RPC request that recently completed |
9903cd1c CL |
842 | * @copied: actual number of bytes received from the transport |
843 | * | |
1570c1e4 | 844 | * Caller holds transport lock. |
1da177e4 | 845 | */ |
1570c1e4 | 846 | void xprt_complete_rqst(struct rpc_task *task, int copied) |
1da177e4 | 847 | { |
1570c1e4 | 848 | struct rpc_rqst *req = task->tk_rqstp; |
fda13939 | 849 | struct rpc_xprt *xprt = req->rq_xprt; |
1da177e4 | 850 | |
1570c1e4 CL |
851 | dprintk("RPC: %5u xid %08x complete (%d bytes received)\n", |
852 | task->tk_pid, ntohl(req->rq_xid), copied); | |
3705ad64 | 853 | trace_xprt_complete_rqst(xprt, req->rq_xid, copied); |
1da177e4 | 854 | |
fda13939 | 855 | xprt->stat.recvs++; |
d60dbb20 | 856 | req->rq_rtt = ktime_sub(ktime_get(), req->rq_xtime); |
bbc72cea CL |
857 | if (xprt->ops->timer != NULL) |
858 | xprt_update_rtt(task); | |
ef759a2e | 859 | |
1da177e4 | 860 | list_del_init(&req->rq_list); |
1e799b67 | 861 | req->rq_private_buf.len = copied; |
dd2b63d0 RL |
862 | /* Ensure all writes are done before we update */ |
863 | /* req->rq_reply_bytes_recvd */ | |
43ac3f29 | 864 | smp_wmb(); |
dd2b63d0 | 865 | req->rq_reply_bytes_recvd = copied; |
fda13939 | 866 | rpc_wake_up_queued_task(&xprt->pending, task); |
1da177e4 | 867 | } |
12444809 | 868 | EXPORT_SYMBOL_GPL(xprt_complete_rqst); |
1da177e4 | 869 | |
46c0ee8b | 870 | static void xprt_timer(struct rpc_task *task) |
1da177e4 | 871 | { |
46c0ee8b | 872 | struct rpc_rqst *req = task->tk_rqstp; |
1da177e4 LT |
873 | struct rpc_xprt *xprt = req->rq_xprt; |
874 | ||
5d00837b TM |
875 | if (task->tk_status != -ETIMEDOUT) |
876 | return; | |
46121cf7 | 877 | dprintk("RPC: %5u xprt_timer\n", task->tk_pid); |
1da177e4 | 878 | |
5d00837b | 879 | spin_lock_bh(&xprt->transport_lock); |
dd2b63d0 | 880 | if (!req->rq_reply_bytes_recvd) { |
46c0ee8b | 881 | if (xprt->ops->timer) |
6a24dfb6 | 882 | xprt->ops->timer(xprt, task); |
5d00837b TM |
883 | } else |
884 | task->tk_status = 0; | |
885 | spin_unlock_bh(&xprt->transport_lock); | |
1da177e4 LT |
886 | } |
887 | ||
4cfc7e60 RI |
888 | static inline int xprt_has_timer(struct rpc_xprt *xprt) |
889 | { | |
890 | return xprt->idle_timeout != 0; | |
891 | } | |
892 | ||
9903cd1c CL |
893 | /** |
894 | * xprt_prepare_transmit - reserve the transport before sending a request | |
895 | * @task: RPC task about to send a request | |
896 | * | |
1da177e4 | 897 | */ |
90051ea7 | 898 | bool xprt_prepare_transmit(struct rpc_task *task) |
1da177e4 LT |
899 | { |
900 | struct rpc_rqst *req = task->tk_rqstp; | |
901 | struct rpc_xprt *xprt = req->rq_xprt; | |
90051ea7 | 902 | bool ret = false; |
1da177e4 | 903 | |
46121cf7 | 904 | dprintk("RPC: %5u xprt_prepare_transmit\n", task->tk_pid); |
1da177e4 | 905 | |
4a0f8c04 | 906 | spin_lock_bh(&xprt->transport_lock); |
8a19a0b6 TM |
907 | if (!req->rq_bytes_sent) { |
908 | if (req->rq_reply_bytes_recvd) { | |
909 | task->tk_status = req->rq_reply_bytes_recvd; | |
910 | goto out_unlock; | |
911 | } | |
912 | if ((task->tk_flags & RPC_TASK_NO_RETRANS_TIMEOUT) | |
913 | && xprt_connected(xprt) | |
914 | && req->rq_connect_cookie == xprt->connect_cookie) { | |
915 | xprt->ops->set_retrans_timeout(task); | |
916 | rpc_sleep_on(&xprt->pending, task, xprt_timer); | |
917 | goto out_unlock; | |
918 | } | |
1da177e4 | 919 | } |
90051ea7 TM |
920 | if (!xprt->ops->reserve_xprt(xprt, task)) { |
921 | task->tk_status = -EAGAIN; | |
922 | goto out_unlock; | |
923 | } | |
924 | ret = true; | |
1da177e4 | 925 | out_unlock: |
4a0f8c04 | 926 | spin_unlock_bh(&xprt->transport_lock); |
90051ea7 | 927 | return ret; |
1da177e4 LT |
928 | } |
929 | ||
e0ab53de | 930 | void xprt_end_transmit(struct rpc_task *task) |
5e5ce5be | 931 | { |
343952fa | 932 | xprt_release_write(task->tk_rqstp->rq_xprt, task); |
5e5ce5be TM |
933 | } |
934 | ||
9903cd1c CL |
935 | /** |
936 | * xprt_transmit - send an RPC request on a transport | |
937 | * @task: controlling RPC task | |
938 | * | |
939 | * We have to copy the iovec because sendmsg fiddles with its contents. | |
940 | */ | |
941 | void xprt_transmit(struct rpc_task *task) | |
1da177e4 | 942 | { |
1da177e4 LT |
943 | struct rpc_rqst *req = task->tk_rqstp; |
944 | struct rpc_xprt *xprt = req->rq_xprt; | |
15a45206 | 945 | int status, numreqs; |
1da177e4 | 946 | |
46121cf7 | 947 | dprintk("RPC: %5u xprt_transmit(%u)\n", task->tk_pid, req->rq_slen); |
1da177e4 | 948 | |
dd2b63d0 | 949 | if (!req->rq_reply_bytes_recvd) { |
55ae1aab RL |
950 | if (list_empty(&req->rq_list) && rpc_reply_expected(task)) { |
951 | /* | |
952 | * Add to the list only if we're expecting a reply | |
953 | */ | |
4a0f8c04 | 954 | spin_lock_bh(&xprt->transport_lock); |
1da177e4 LT |
955 | /* Update the softirq receive buffer */ |
956 | memcpy(&req->rq_private_buf, &req->rq_rcv_buf, | |
957 | sizeof(req->rq_private_buf)); | |
958 | /* Add request to the receive list */ | |
959 | list_add_tail(&req->rq_list, &xprt->recv); | |
4a0f8c04 | 960 | spin_unlock_bh(&xprt->transport_lock); |
1da177e4 | 961 | xprt_reset_majortimeo(req); |
0f9dc2b1 TM |
962 | /* Turn off autodisconnect */ |
963 | del_singleshot_timer_sync(&xprt->timer); | |
1da177e4 LT |
964 | } |
965 | } else if (!req->rq_bytes_sent) | |
966 | return; | |
967 | ||
ff839970 | 968 | req->rq_xtime = ktime_get(); |
a246b010 | 969 | status = xprt->ops->send_request(task); |
3705ad64 | 970 | trace_xprt_transmit(xprt, req->rq_xid, status); |
c8485e4d TM |
971 | if (status != 0) { |
972 | task->tk_status = status; | |
973 | return; | |
974 | } | |
4a068258 | 975 | xprt_inject_disconnect(xprt); |
262ca07d | 976 | |
c8485e4d | 977 | dprintk("RPC: %5u xmit complete\n", task->tk_pid); |
468f8613 | 978 | task->tk_flags |= RPC_TASK_SENT; |
c8485e4d | 979 | spin_lock_bh(&xprt->transport_lock); |
262ca07d | 980 | |
c8485e4d | 981 | xprt->ops->set_retrans_timeout(task); |
262ca07d | 982 | |
15a45206 AA |
983 | numreqs = atomic_read(&xprt->num_reqs); |
984 | if (numreqs > xprt->stat.max_slots) | |
985 | xprt->stat.max_slots = numreqs; | |
c8485e4d TM |
986 | xprt->stat.sends++; |
987 | xprt->stat.req_u += xprt->stat.sends - xprt->stat.recvs; | |
988 | xprt->stat.bklog_u += xprt->backlog.qlen; | |
15a45206 AA |
989 | xprt->stat.sending_u += xprt->sending.qlen; |
990 | xprt->stat.pending_u += xprt->pending.qlen; | |
1da177e4 | 991 | |
c8485e4d TM |
992 | /* Don't race with disconnect */ |
993 | if (!xprt_connected(xprt)) | |
994 | task->tk_status = -ENOTCONN; | |
0a660521 | 995 | else { |
55ae1aab RL |
996 | /* |
997 | * Sleep on the pending queue since | |
998 | * we're expecting a reply. | |
999 | */ | |
0a660521 TM |
1000 | if (!req->rq_reply_bytes_recvd && rpc_reply_expected(task)) |
1001 | rpc_sleep_on(&xprt->pending, task, xprt_timer); | |
1002 | req->rq_connect_cookie = xprt->connect_cookie; | |
55ae1aab | 1003 | } |
c8485e4d | 1004 | spin_unlock_bh(&xprt->transport_lock); |
1da177e4 LT |
1005 | } |
1006 | ||
ba60eb25 TM |
1007 | static void xprt_add_backlog(struct rpc_xprt *xprt, struct rpc_task *task) |
1008 | { | |
1009 | set_bit(XPRT_CONGESTED, &xprt->state); | |
1010 | rpc_sleep_on(&xprt->backlog, task, NULL); | |
1011 | } | |
1012 | ||
1013 | static void xprt_wake_up_backlog(struct rpc_xprt *xprt) | |
1014 | { | |
1015 | if (rpc_wake_up_next(&xprt->backlog) == NULL) | |
1016 | clear_bit(XPRT_CONGESTED, &xprt->state); | |
1017 | } | |
1018 | ||
1019 | static bool xprt_throttle_congested(struct rpc_xprt *xprt, struct rpc_task *task) | |
1020 | { | |
1021 | bool ret = false; | |
1022 | ||
1023 | if (!test_bit(XPRT_CONGESTED, &xprt->state)) | |
1024 | goto out; | |
1025 | spin_lock(&xprt->reserve_lock); | |
1026 | if (test_bit(XPRT_CONGESTED, &xprt->state)) { | |
1027 | rpc_sleep_on(&xprt->backlog, task, NULL); | |
1028 | ret = true; | |
1029 | } | |
1030 | spin_unlock(&xprt->reserve_lock); | |
1031 | out: | |
1032 | return ret; | |
1033 | } | |
1034 | ||
d9ba131d TM |
1035 | static struct rpc_rqst *xprt_dynamic_alloc_slot(struct rpc_xprt *xprt, gfp_t gfp_flags) |
1036 | { | |
1037 | struct rpc_rqst *req = ERR_PTR(-EAGAIN); | |
1038 | ||
1039 | if (!atomic_add_unless(&xprt->num_reqs, 1, xprt->max_reqs)) | |
1040 | goto out; | |
1041 | req = kzalloc(sizeof(struct rpc_rqst), gfp_flags); | |
1042 | if (req != NULL) | |
1043 | goto out; | |
1044 | atomic_dec(&xprt->num_reqs); | |
1045 | req = ERR_PTR(-ENOMEM); | |
1046 | out: | |
1047 | return req; | |
1048 | } | |
1049 | ||
1050 | static bool xprt_dynamic_free_slot(struct rpc_xprt *xprt, struct rpc_rqst *req) | |
1051 | { | |
1052 | if (atomic_add_unless(&xprt->num_reqs, -1, xprt->min_reqs)) { | |
1053 | kfree(req); | |
1054 | return true; | |
1055 | } | |
1056 | return false; | |
1057 | } | |
1058 | ||
f39c1bfb | 1059 | void xprt_alloc_slot(struct rpc_xprt *xprt, struct rpc_task *task) |
1da177e4 | 1060 | { |
d9ba131d | 1061 | struct rpc_rqst *req; |
1da177e4 | 1062 | |
f39c1bfb | 1063 | spin_lock(&xprt->reserve_lock); |
1da177e4 | 1064 | if (!list_empty(&xprt->free)) { |
d9ba131d TM |
1065 | req = list_entry(xprt->free.next, struct rpc_rqst, rq_list); |
1066 | list_del(&req->rq_list); | |
1067 | goto out_init_req; | |
1068 | } | |
6b343099 | 1069 | req = xprt_dynamic_alloc_slot(xprt, GFP_NOWAIT|__GFP_NOWARN); |
d9ba131d TM |
1070 | if (!IS_ERR(req)) |
1071 | goto out_init_req; | |
1072 | switch (PTR_ERR(req)) { | |
1073 | case -ENOMEM: | |
d9ba131d TM |
1074 | dprintk("RPC: dynamic allocation of request slot " |
1075 | "failed! Retrying\n"); | |
1afeaf5c | 1076 | task->tk_status = -ENOMEM; |
d9ba131d TM |
1077 | break; |
1078 | case -EAGAIN: | |
ba60eb25 | 1079 | xprt_add_backlog(xprt, task); |
d9ba131d | 1080 | dprintk("RPC: waiting for request slot\n"); |
1afeaf5c TM |
1081 | default: |
1082 | task->tk_status = -EAGAIN; | |
1da177e4 | 1083 | } |
f39c1bfb | 1084 | spin_unlock(&xprt->reserve_lock); |
d9ba131d TM |
1085 | return; |
1086 | out_init_req: | |
1087 | task->tk_status = 0; | |
1088 | task->tk_rqstp = req; | |
1089 | xprt_request_init(task, xprt); | |
f39c1bfb TM |
1090 | spin_unlock(&xprt->reserve_lock); |
1091 | } | |
1092 | EXPORT_SYMBOL_GPL(xprt_alloc_slot); | |
1093 | ||
1094 | void xprt_lock_and_alloc_slot(struct rpc_xprt *xprt, struct rpc_task *task) | |
1095 | { | |
1096 | /* Note: grabbing the xprt_lock_write() ensures that we throttle | |
1097 | * new slot allocation if the transport is congested (i.e. when | |
1098 | * reconnecting a stream transport or when out of socket write | |
1099 | * buffer space). | |
1100 | */ | |
1101 | if (xprt_lock_write(xprt, task)) { | |
1102 | xprt_alloc_slot(xprt, task); | |
1103 | xprt_release_write(xprt, task); | |
1104 | } | |
1da177e4 | 1105 | } |
f39c1bfb | 1106 | EXPORT_SYMBOL_GPL(xprt_lock_and_alloc_slot); |
1da177e4 | 1107 | |
ee5ebe85 TM |
1108 | static void xprt_free_slot(struct rpc_xprt *xprt, struct rpc_rqst *req) |
1109 | { | |
ee5ebe85 | 1110 | spin_lock(&xprt->reserve_lock); |
c25573b5 TM |
1111 | if (!xprt_dynamic_free_slot(xprt, req)) { |
1112 | memset(req, 0, sizeof(*req)); /* mark unused */ | |
1113 | list_add(&req->rq_list, &xprt->free); | |
1114 | } | |
ba60eb25 | 1115 | xprt_wake_up_backlog(xprt); |
ee5ebe85 TM |
1116 | spin_unlock(&xprt->reserve_lock); |
1117 | } | |
1118 | ||
21de0a95 TM |
1119 | static void xprt_free_all_slots(struct rpc_xprt *xprt) |
1120 | { | |
1121 | struct rpc_rqst *req; | |
1122 | while (!list_empty(&xprt->free)) { | |
1123 | req = list_first_entry(&xprt->free, struct rpc_rqst, rq_list); | |
1124 | list_del(&req->rq_list); | |
1125 | kfree(req); | |
1126 | } | |
1127 | } | |
1128 | ||
d9ba131d TM |
1129 | struct rpc_xprt *xprt_alloc(struct net *net, size_t size, |
1130 | unsigned int num_prealloc, | |
1131 | unsigned int max_alloc) | |
bd1722d4 PE |
1132 | { |
1133 | struct rpc_xprt *xprt; | |
21de0a95 TM |
1134 | struct rpc_rqst *req; |
1135 | int i; | |
bd1722d4 PE |
1136 | |
1137 | xprt = kzalloc(size, GFP_KERNEL); | |
1138 | if (xprt == NULL) | |
1139 | goto out; | |
1140 | ||
21de0a95 TM |
1141 | xprt_init(xprt, net); |
1142 | ||
1143 | for (i = 0; i < num_prealloc; i++) { | |
1144 | req = kzalloc(sizeof(struct rpc_rqst), GFP_KERNEL); | |
1145 | if (!req) | |
8313164c | 1146 | goto out_free; |
21de0a95 TM |
1147 | list_add(&req->rq_list, &xprt->free); |
1148 | } | |
d9ba131d TM |
1149 | if (max_alloc > num_prealloc) |
1150 | xprt->max_reqs = max_alloc; | |
1151 | else | |
1152 | xprt->max_reqs = num_prealloc; | |
1153 | xprt->min_reqs = num_prealloc; | |
1154 | atomic_set(&xprt->num_reqs, num_prealloc); | |
bd1722d4 PE |
1155 | |
1156 | return xprt; | |
1157 | ||
1158 | out_free: | |
21de0a95 | 1159 | xprt_free(xprt); |
bd1722d4 PE |
1160 | out: |
1161 | return NULL; | |
1162 | } | |
1163 | EXPORT_SYMBOL_GPL(xprt_alloc); | |
1164 | ||
e204e621 PE |
1165 | void xprt_free(struct rpc_xprt *xprt) |
1166 | { | |
37aa2133 | 1167 | put_net(xprt->xprt_net); |
21de0a95 | 1168 | xprt_free_all_slots(xprt); |
e204e621 PE |
1169 | kfree(xprt); |
1170 | } | |
1171 | EXPORT_SYMBOL_GPL(xprt_free); | |
1172 | ||
9903cd1c CL |
1173 | /** |
1174 | * xprt_reserve - allocate an RPC request slot | |
1175 | * @task: RPC task requesting a slot allocation | |
1176 | * | |
ba60eb25 TM |
1177 | * If the transport is marked as being congested, or if no more |
1178 | * slots are available, place the task on the transport's | |
9903cd1c CL |
1179 | * backlog queue. |
1180 | */ | |
1181 | void xprt_reserve(struct rpc_task *task) | |
1da177e4 | 1182 | { |
45bc0dce | 1183 | struct rpc_xprt *xprt; |
1da177e4 | 1184 | |
43cedbf0 TM |
1185 | task->tk_status = 0; |
1186 | if (task->tk_rqstp != NULL) | |
1187 | return; | |
1188 | ||
43cedbf0 TM |
1189 | task->tk_timeout = 0; |
1190 | task->tk_status = -EAGAIN; | |
45bc0dce TM |
1191 | rcu_read_lock(); |
1192 | xprt = rcu_dereference(task->tk_client->cl_xprt); | |
ba60eb25 TM |
1193 | if (!xprt_throttle_congested(xprt, task)) |
1194 | xprt->ops->alloc_slot(xprt, task); | |
1195 | rcu_read_unlock(); | |
1196 | } | |
1197 | ||
1198 | /** | |
1199 | * xprt_retry_reserve - allocate an RPC request slot | |
1200 | * @task: RPC task requesting a slot allocation | |
1201 | * | |
1202 | * If no more slots are available, place the task on the transport's | |
1203 | * backlog queue. | |
1204 | * Note that the only difference with xprt_reserve is that we now | |
1205 | * ignore the value of the XPRT_CONGESTED flag. | |
1206 | */ | |
1207 | void xprt_retry_reserve(struct rpc_task *task) | |
1208 | { | |
1209 | struct rpc_xprt *xprt; | |
1210 | ||
1211 | task->tk_status = 0; | |
1212 | if (task->tk_rqstp != NULL) | |
1213 | return; | |
1214 | ||
1215 | task->tk_timeout = 0; | |
1216 | task->tk_status = -EAGAIN; | |
1217 | rcu_read_lock(); | |
1218 | xprt = rcu_dereference(task->tk_client->cl_xprt); | |
f39c1bfb | 1219 | xprt->ops->alloc_slot(xprt, task); |
45bc0dce | 1220 | rcu_read_unlock(); |
1da177e4 LT |
1221 | } |
1222 | ||
d8ed029d | 1223 | static inline __be32 xprt_alloc_xid(struct rpc_xprt *xprt) |
1da177e4 | 1224 | { |
0eae88f3 | 1225 | return (__force __be32)xprt->xid++; |
1da177e4 LT |
1226 | } |
1227 | ||
1228 | static inline void xprt_init_xid(struct rpc_xprt *xprt) | |
1229 | { | |
63862b5b | 1230 | xprt->xid = prandom_u32(); |
1da177e4 LT |
1231 | } |
1232 | ||
9903cd1c | 1233 | static void xprt_request_init(struct rpc_task *task, struct rpc_xprt *xprt) |
1da177e4 LT |
1234 | { |
1235 | struct rpc_rqst *req = task->tk_rqstp; | |
1236 | ||
d9ba131d | 1237 | INIT_LIST_HEAD(&req->rq_list); |
ba7392bb | 1238 | req->rq_timeout = task->tk_client->cl_timeout->to_initval; |
1da177e4 LT |
1239 | req->rq_task = task; |
1240 | req->rq_xprt = xprt; | |
02107148 | 1241 | req->rq_buffer = NULL; |
1da177e4 | 1242 | req->rq_xid = xprt_alloc_xid(xprt); |
0a660521 | 1243 | req->rq_connect_cookie = xprt->connect_cookie - 1; |
92551948 TM |
1244 | req->rq_bytes_sent = 0; |
1245 | req->rq_snd_buf.len = 0; | |
1246 | req->rq_snd_buf.buflen = 0; | |
1247 | req->rq_rcv_buf.len = 0; | |
1248 | req->rq_rcv_buf.buflen = 0; | |
ead5e1c2 | 1249 | req->rq_release_snd_buf = NULL; |
da45828e | 1250 | xprt_reset_majortimeo(req); |
46121cf7 | 1251 | dprintk("RPC: %5u reserved req %p xid %08x\n", task->tk_pid, |
1da177e4 LT |
1252 | req, ntohl(req->rq_xid)); |
1253 | } | |
1254 | ||
9903cd1c CL |
1255 | /** |
1256 | * xprt_release - release an RPC request slot | |
1257 | * @task: task which is finished with the slot | |
1258 | * | |
1da177e4 | 1259 | */ |
9903cd1c | 1260 | void xprt_release(struct rpc_task *task) |
1da177e4 | 1261 | { |
55ae1aab | 1262 | struct rpc_xprt *xprt; |
87ed5003 | 1263 | struct rpc_rqst *req = task->tk_rqstp; |
1da177e4 | 1264 | |
87ed5003 TM |
1265 | if (req == NULL) { |
1266 | if (task->tk_client) { | |
1267 | rcu_read_lock(); | |
1268 | xprt = rcu_dereference(task->tk_client->cl_xprt); | |
1269 | if (xprt->snd_task == task) | |
1270 | xprt_release_write(xprt, task); | |
1271 | rcu_read_unlock(); | |
1272 | } | |
1da177e4 | 1273 | return; |
87ed5003 | 1274 | } |
55ae1aab | 1275 | |
55ae1aab | 1276 | xprt = req->rq_xprt; |
0a702195 WAA |
1277 | if (task->tk_ops->rpc_count_stats != NULL) |
1278 | task->tk_ops->rpc_count_stats(task, task->tk_calldata); | |
1279 | else if (task->tk_client) | |
1280 | rpc_count_iostats(task, task->tk_client->cl_metrics); | |
4a0f8c04 | 1281 | spin_lock_bh(&xprt->transport_lock); |
49e9a890 | 1282 | xprt->ops->release_xprt(xprt, task); |
a58dd398 CL |
1283 | if (xprt->ops->release_request) |
1284 | xprt->ops->release_request(task); | |
1da177e4 LT |
1285 | if (!list_empty(&req->rq_list)) |
1286 | list_del(&req->rq_list); | |
1287 | xprt->last_used = jiffies; | |
4cfc7e60 | 1288 | if (list_empty(&xprt->recv) && xprt_has_timer(xprt)) |
a246b010 | 1289 | mod_timer(&xprt->timer, |
03bf4b70 | 1290 | xprt->last_used + xprt->idle_timeout); |
4a0f8c04 | 1291 | spin_unlock_bh(&xprt->transport_lock); |
ee5ebe85 | 1292 | if (req->rq_buffer) |
55ae1aab | 1293 | xprt->ops->buf_free(req->rq_buffer); |
4a068258 | 1294 | xprt_inject_disconnect(xprt); |
a17c2153 TM |
1295 | if (req->rq_cred != NULL) |
1296 | put_rpccred(req->rq_cred); | |
1da177e4 | 1297 | task->tk_rqstp = NULL; |
ead5e1c2 BF |
1298 | if (req->rq_release_snd_buf) |
1299 | req->rq_release_snd_buf(req); | |
55ae1aab | 1300 | |
46121cf7 | 1301 | dprintk("RPC: %5u release request %p\n", task->tk_pid, req); |
ee5ebe85 TM |
1302 | if (likely(!bc_prealloc(req))) |
1303 | xprt_free_slot(xprt, req); | |
1304 | else | |
c9acb42e | 1305 | xprt_free_bc_request(req); |
1da177e4 LT |
1306 | } |
1307 | ||
21de0a95 | 1308 | static void xprt_init(struct rpc_xprt *xprt, struct net *net) |
c2866763 | 1309 | { |
21de0a95 | 1310 | atomic_set(&xprt->count, 1); |
c2866763 CL |
1311 | |
1312 | spin_lock_init(&xprt->transport_lock); | |
1313 | spin_lock_init(&xprt->reserve_lock); | |
1314 | ||
1315 | INIT_LIST_HEAD(&xprt->free); | |
1316 | INIT_LIST_HEAD(&xprt->recv); | |
9e00abc3 | 1317 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
f9acac1a RL |
1318 | spin_lock_init(&xprt->bc_pa_lock); |
1319 | INIT_LIST_HEAD(&xprt->bc_pa_list); | |
9e00abc3 | 1320 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
f9acac1a | 1321 | |
c2866763 CL |
1322 | xprt->last_used = jiffies; |
1323 | xprt->cwnd = RPC_INITCWND; | |
a509050b | 1324 | xprt->bind_index = 0; |
c2866763 CL |
1325 | |
1326 | rpc_init_wait_queue(&xprt->binding, "xprt_binding"); | |
1327 | rpc_init_wait_queue(&xprt->pending, "xprt_pending"); | |
34006cee | 1328 | rpc_init_priority_wait_queue(&xprt->sending, "xprt_sending"); |
c2866763 CL |
1329 | rpc_init_priority_wait_queue(&xprt->backlog, "xprt_backlog"); |
1330 | ||
c2866763 CL |
1331 | xprt_init_xid(xprt); |
1332 | ||
21de0a95 | 1333 | xprt->xprt_net = get_net(net); |
8d9266ff TM |
1334 | } |
1335 | ||
1336 | /** | |
1337 | * xprt_create_transport - create an RPC transport | |
1338 | * @args: rpc transport creation arguments | |
1339 | * | |
1340 | */ | |
1341 | struct rpc_xprt *xprt_create_transport(struct xprt_create *args) | |
1342 | { | |
1343 | struct rpc_xprt *xprt; | |
1344 | struct xprt_class *t; | |
1345 | ||
1346 | spin_lock(&xprt_list_lock); | |
1347 | list_for_each_entry(t, &xprt_list, list) { | |
1348 | if (t->ident == args->ident) { | |
1349 | spin_unlock(&xprt_list_lock); | |
1350 | goto found; | |
1351 | } | |
1352 | } | |
1353 | spin_unlock(&xprt_list_lock); | |
3c45ddf8 | 1354 | dprintk("RPC: transport (%d) not supported\n", args->ident); |
8d9266ff TM |
1355 | return ERR_PTR(-EIO); |
1356 | ||
1357 | found: | |
1358 | xprt = t->setup(args); | |
1359 | if (IS_ERR(xprt)) { | |
1360 | dprintk("RPC: xprt_create_transport: failed, %ld\n", | |
1361 | -PTR_ERR(xprt)); | |
21de0a95 | 1362 | goto out; |
8d9266ff | 1363 | } |
33d90ac0 BF |
1364 | if (args->flags & XPRT_CREATE_NO_IDLE_TIMEOUT) |
1365 | xprt->idle_timeout = 0; | |
21de0a95 TM |
1366 | INIT_WORK(&xprt->task_cleanup, xprt_autoclose); |
1367 | if (xprt_has_timer(xprt)) | |
1368 | setup_timer(&xprt->timer, xprt_init_autodisconnect, | |
1369 | (unsigned long)xprt); | |
1370 | else | |
1371 | init_timer(&xprt->timer); | |
4e0038b6 TM |
1372 | |
1373 | if (strlen(args->servername) > RPC_MAXNETNAMELEN) { | |
1374 | xprt_destroy(xprt); | |
1375 | return ERR_PTR(-EINVAL); | |
1376 | } | |
1377 | xprt->servername = kstrdup(args->servername, GFP_KERNEL); | |
1378 | if (xprt->servername == NULL) { | |
1379 | xprt_destroy(xprt); | |
1380 | return ERR_PTR(-ENOMEM); | |
1381 | } | |
1382 | ||
3f940098 | 1383 | rpc_xprt_debugfs_register(xprt); |
388f0c77 | 1384 | |
46121cf7 | 1385 | dprintk("RPC: created transport %p with %u slots\n", xprt, |
c2866763 | 1386 | xprt->max_reqs); |
21de0a95 | 1387 | out: |
c2866763 CL |
1388 | return xprt; |
1389 | } | |
1390 | ||
9903cd1c CL |
1391 | /** |
1392 | * xprt_destroy - destroy an RPC transport, killing off all requests. | |
a8de240a | 1393 | * @xprt: transport to destroy |
9903cd1c | 1394 | * |
1da177e4 | 1395 | */ |
a8de240a | 1396 | static void xprt_destroy(struct rpc_xprt *xprt) |
1da177e4 | 1397 | { |
46121cf7 | 1398 | dprintk("RPC: destroying transport %p\n", xprt); |
79234c3d TM |
1399 | |
1400 | /* Exclude transport connect/disconnect handlers */ | |
1401 | wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_UNINTERRUPTIBLE); | |
1402 | ||
0065db32 | 1403 | del_timer_sync(&xprt->timer); |
c8541ecd | 1404 | |
388f0c77 | 1405 | rpc_xprt_debugfs_unregister(xprt); |
f6a1cc89 TM |
1406 | rpc_destroy_wait_queue(&xprt->binding); |
1407 | rpc_destroy_wait_queue(&xprt->pending); | |
1408 | rpc_destroy_wait_queue(&xprt->sending); | |
f6a1cc89 | 1409 | rpc_destroy_wait_queue(&xprt->backlog); |
c3ae62ae | 1410 | cancel_work_sync(&xprt->task_cleanup); |
4e0038b6 | 1411 | kfree(xprt->servername); |
c8541ecd CL |
1412 | /* |
1413 | * Tear down transport state and free the rpc_xprt | |
1414 | */ | |
a246b010 | 1415 | xprt->ops->destroy(xprt); |
6b6ca86b | 1416 | } |
1da177e4 | 1417 | |
6b6ca86b TM |
1418 | /** |
1419 | * xprt_put - release a reference to an RPC transport. | |
1420 | * @xprt: pointer to the transport | |
1421 | * | |
1422 | */ | |
1423 | void xprt_put(struct rpc_xprt *xprt) | |
1424 | { | |
a8de240a TM |
1425 | if (atomic_dec_and_test(&xprt->count)) |
1426 | xprt_destroy(xprt); | |
6b6ca86b | 1427 | } |
5d252f90 | 1428 | EXPORT_SYMBOL_GPL(xprt_put); |