1 /*
2 * linux/fs/lockd/clntproc.c
3 *
4 * RPC procedures for the client side NLM implementation
5 *
6 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
7 */
8
9 #include <linux/config.h>
10 #include <linux/types.h>
11 #include <linux/errno.h>
12 #include <linux/fs.h>
13 #include <linux/nfs_fs.h>
14 #include <linux/utsname.h>
15 #include <linux/smp_lock.h>
16 #include <linux/sunrpc/clnt.h>
17 #include <linux/sunrpc/svc.h>
18 #include <linux/lockd/lockd.h>
19 #include <linux/lockd/sm_inter.h>
20
21 #define NLMDBG_FACILITY NLMDBG_CLIENT
22 #define NLMCLNT_GRACE_WAIT (5*HZ)
23
24 static int nlmclnt_test(struct nlm_rqst *, struct file_lock *);
25 static int nlmclnt_lock(struct nlm_rqst *, struct file_lock *);
26 static int nlmclnt_unlock(struct nlm_rqst *, struct file_lock *);
27 static void nlmclnt_unlock_callback(struct rpc_task *);
28 static void nlmclnt_cancel_callback(struct rpc_task *);
29 static int nlm_stat_to_errno(u32 stat);
30
31 /*
32 * Cookie counter for NLM requests
33 */
34 static u32 nlm_cookie = 0x1234;
35
nlmclnt_next_cookie(struct nlm_cookie * c)36 static inline void nlmclnt_next_cookie(struct nlm_cookie *c)
37 {
38 memcpy(c->data, &nlm_cookie, 4);
39 memset(c->data+4, 0, 4);
40 c->len=4;
41 nlm_cookie++;
42 }
43
44 /*
45 * Initialize arguments for TEST/LOCK/UNLOCK/CANCEL calls
46 */
47 static inline void
nlmclnt_setlockargs(struct nlm_rqst * req,struct file_lock * fl)48 nlmclnt_setlockargs(struct nlm_rqst *req, struct file_lock *fl)
49 {
50 struct nlm_args *argp = &req->a_args;
51 struct nlm_lock *lock = &argp->lock;
52
53 nlmclnt_next_cookie(&argp->cookie);
54 argp->state = nsm_local_state;
55 memcpy(&lock->fh, NFS_FH(fl->fl_file->f_dentry->d_inode), sizeof(struct nfs_fh));
56 lock->caller = system_utsname.nodename;
57 lock->oh.data = req->a_owner;
58 lock->oh.len = sprintf(req->a_owner, "%d@%s",
59 current->pid, system_utsname.nodename);
60 locks_copy_lock(&lock->fl, fl);
61 }
62
63 /*
64 * Initialize arguments for GRANTED call. The nlm_rqst structure
65 * has been cleared already.
66 */
67 int
nlmclnt_setgrantargs(struct nlm_rqst * call,struct nlm_lock * lock)68 nlmclnt_setgrantargs(struct nlm_rqst *call, struct nlm_lock *lock)
69 {
70 locks_copy_lock(&call->a_args.lock.fl, &lock->fl);
71 memcpy(&call->a_args.lock.fh, &lock->fh, sizeof(call->a_args.lock.fh));
72 call->a_args.lock.caller = system_utsname.nodename;
73 call->a_args.lock.oh.len = lock->oh.len;
74
75 /* set default data area */
76 call->a_args.lock.oh.data = call->a_owner;
77
78 if (lock->oh.len > NLMCLNT_OHSIZE) {
79 void *data = kmalloc(lock->oh.len, GFP_KERNEL);
80 if (!data)
81 return 0;
82 call->a_args.lock.oh.data = (u8 *) data;
83 }
84
85 memcpy(call->a_args.lock.oh.data, lock->oh.data, lock->oh.len);
86 return 1;
87 }
88
89 void
nlmclnt_freegrantargs(struct nlm_rqst * call)90 nlmclnt_freegrantargs(struct nlm_rqst *call)
91 {
92 /*
93 * Check whether we allocated memory for the owner.
94 */
95 if (call->a_args.lock.oh.data != (u8 *) call->a_owner) {
96 kfree(call->a_args.lock.oh.data);
97 }
98 }
99
100 /*
101 * This is the main entry point for the NLM client.
102 */
103 int
nlmclnt_proc(struct inode * inode,int cmd,struct file_lock * fl)104 nlmclnt_proc(struct inode *inode, int cmd, struct file_lock *fl)
105 {
106 struct nfs_server *nfssrv = NFS_SERVER(inode);
107 struct nlm_host *host;
108 struct nlm_rqst reqst, *call = &reqst;
109 sigset_t oldset;
110 unsigned long flags;
111 int status, proto, vers;
112
113 vers = (NFS_PROTO(inode)->version == 3) ? 4 : 1;
114 if (NFS_PROTO(inode)->version > 3) {
115 printk(KERN_NOTICE "NFSv4 file locking not implemented!\n");
116 return -ENOLCK;
117 }
118
119 /* Retrieve transport protocol from NFS client */
120 proto = NFS_CLIENT(inode)->cl_xprt->prot;
121
122 if (!(host = nlmclnt_lookup_host(NFS_ADDR(inode), proto, vers)))
123 return -ENOLCK;
124
125 /* Create RPC client handle if not there, and copy soft
126 * and intr flags from NFS client. */
127 if (host->h_rpcclnt == NULL) {
128 struct rpc_clnt *clnt;
129
130 /* Bind an rpc client to this host handle (does not
131 * perform a portmapper lookup) */
132 if (!(clnt = nlm_bind_host(host))) {
133 status = -ENOLCK;
134 goto done;
135 }
136 clnt->cl_softrtry = nfssrv->client->cl_softrtry;
137 clnt->cl_intr = nfssrv->client->cl_intr;
138 clnt->cl_chatty = nfssrv->client->cl_chatty;
139 }
140
141 /* Keep the old signal mask */
142 spin_lock_irqsave(¤t->sigmask_lock, flags);
143 oldset = current->blocked;
144
145 /* If we're cleaning up locks because the process is exiting,
146 * perform the RPC call asynchronously. */
147 if ((IS_SETLK(cmd) || IS_SETLKW(cmd))
148 && fl->fl_type == F_UNLCK
149 && (current->flags & PF_EXITING)) {
150 sigfillset(¤t->blocked); /* Mask all signals */
151 recalc_sigpending(current);
152 spin_unlock_irqrestore(¤t->sigmask_lock, flags);
153
154 call = nlmclnt_alloc_call();
155 if (!call) {
156 status = -ENOMEM;
157 goto out_restore;
158 }
159 call->a_flags = RPC_TASK_ASYNC;
160 } else {
161 spin_unlock_irqrestore(¤t->sigmask_lock, flags);
162 memset(call, 0, sizeof(*call));
163 locks_init_lock(&call->a_args.lock.fl);
164 locks_init_lock(&call->a_res.lock.fl);
165 }
166 call->a_host = host;
167
168 /* Set up the argument struct */
169 nlmclnt_setlockargs(call, fl);
170
171 if (IS_SETLK(cmd) || IS_SETLKW(cmd)) {
172 if (fl->fl_type != F_UNLCK) {
173 call->a_args.block = IS_SETLKW(cmd) ? 1 : 0;
174 status = nlmclnt_lock(call, fl);
175 } else
176 status = nlmclnt_unlock(call, fl);
177 } else if (IS_GETLK(cmd))
178 status = nlmclnt_test(call, fl);
179 else
180 status = -EINVAL;
181
182 if (status < 0 && (call->a_flags & RPC_TASK_ASYNC))
183 kfree(call);
184
185 out_restore:
186 spin_lock_irqsave(¤t->sigmask_lock, flags);
187 current->blocked = oldset;
188 recalc_sigpending(current);
189 spin_unlock_irqrestore(¤t->sigmask_lock, flags);
190
191 done:
192 dprintk("lockd: clnt proc returns %d\n", status);
193 nlm_release_host(host);
194 return status;
195 }
196
197 /*
198 * Wait while server is in grace period
199 */
200 static inline int
nlmclnt_grace_wait(struct nlm_host * host)201 nlmclnt_grace_wait(struct nlm_host *host)
202 {
203 if (!host->h_reclaiming)
204 interruptible_sleep_on_timeout(&host->h_gracewait, 10*HZ);
205 else
206 interruptible_sleep_on(&host->h_gracewait);
207 return signalled()? -ERESTARTSYS : 0;
208 }
209
210 /*
211 * Allocate an NLM RPC call struct
212 */
213 struct nlm_rqst *
nlmclnt_alloc_call(void)214 nlmclnt_alloc_call(void)
215 {
216 struct nlm_rqst *call;
217
218 while (!signalled()) {
219 call = (struct nlm_rqst *) kmalloc(sizeof(struct nlm_rqst), GFP_KERNEL);
220 if (call) {
221 memset(call, 0, sizeof(*call));
222 locks_init_lock(&call->a_args.lock.fl);
223 locks_init_lock(&call->a_res.lock.fl);
224 return call;
225 }
226 printk("nlmclnt_alloc_call: failed, waiting for memory\n");
227 current->state = TASK_INTERRUPTIBLE;
228 schedule_timeout(5*HZ);
229 }
230 return NULL;
231 }
232
233 /*
234 * Generic NLM call
235 */
236 int
nlmclnt_call(struct nlm_rqst * req,u32 proc)237 nlmclnt_call(struct nlm_rqst *req, u32 proc)
238 {
239 struct nlm_host *host = req->a_host;
240 struct rpc_clnt *clnt;
241 struct nlm_args *argp = &req->a_args;
242 struct nlm_res *resp = &req->a_res;
243 struct file *filp = argp->lock.fl.fl_file;
244 struct rpc_message msg;
245 int status;
246
247 dprintk("lockd: call procedure %s on %s\n",
248 nlm_procname(proc), host->h_name);
249
250 msg.rpc_proc = proc;
251 msg.rpc_argp = argp;
252 msg.rpc_resp = resp;
253 if (filp)
254 msg.rpc_cred = nfs_file_cred(filp);
255 else
256 msg.rpc_cred = NULL;
257
258 do {
259 if (host->h_reclaiming && !argp->reclaim) {
260 interruptible_sleep_on(&host->h_gracewait);
261 continue;
262 }
263
264 /* If we have no RPC client yet, create one. */
265 if ((clnt = nlm_bind_host(host)) == NULL)
266 return -ENOLCK;
267
268 /* Perform the RPC call. If an error occurs, try again */
269 if ((status = rpc_call_sync(clnt, &msg, 0)) < 0) {
270 dprintk("lockd: rpc_call returned error %d\n", -status);
271 switch (status) {
272 case -EPROTONOSUPPORT:
273 status = -EINVAL;
274 break;
275 case -ECONNREFUSED:
276 case -ETIMEDOUT:
277 case -ENOTCONN:
278 nlm_rebind_host(host);
279 status = -EAGAIN;
280 break;
281 case -ERESTARTSYS:
282 return signalled () ? -EINTR : status;
283 default:
284 break;
285 }
286 break;
287 } else
288 if (resp->status == NLM_LCK_DENIED_GRACE_PERIOD) {
289 dprintk("lockd: server in grace period\n");
290 if (argp->reclaim) {
291 printk(KERN_WARNING
292 "lockd: spurious grace period reject?!\n");
293 return -ENOLCK;
294 }
295 } else {
296 dprintk("lockd: server returns status %d\n", resp->status);
297 return 0; /* Okay, call complete */
298 }
299
300 /* Back off a little and try again */
301 interruptible_sleep_on_timeout(&host->h_gracewait, 15*HZ);
302
303 /* When the lock requested by F_SETLKW isn't available,
304 we will wait until the request can be satisfied. If
305 a signal is received during wait, we should return
306 -EINTR. */
307 if (signalled ()) {
308 status = -EINTR;
309 break;
310 }
311 } while (1);
312
313 return status;
314 }
315
316 /*
317 * Generic NLM call, async version.
318 */
319 int
nlmsvc_async_call(struct nlm_rqst * req,u32 proc,rpc_action callback)320 nlmsvc_async_call(struct nlm_rqst *req, u32 proc, rpc_action callback)
321 {
322 struct nlm_host *host = req->a_host;
323 struct rpc_clnt *clnt;
324 struct nlm_args *argp = &req->a_args;
325 struct nlm_res *resp = &req->a_res;
326 struct rpc_message msg;
327 int status;
328
329 dprintk("lockd: call procedure %s on %s (async)\n",
330 nlm_procname(proc), host->h_name);
331
332 /* If we have no RPC client yet, create one. */
333 if ((clnt = nlm_bind_host(host)) == NULL)
334 return -ENOLCK;
335
336 /* bootstrap and kick off the async RPC call */
337 msg.rpc_proc = proc;
338 msg.rpc_argp = argp;
339 msg.rpc_resp =resp;
340 msg.rpc_cred = NULL;
341 status = rpc_call_async(clnt, &msg, RPC_TASK_ASYNC, callback, req);
342
343 return status;
344 }
345
346 int
nlmclnt_async_call(struct nlm_rqst * req,u32 proc,rpc_action callback)347 nlmclnt_async_call(struct nlm_rqst *req, u32 proc, rpc_action callback)
348 {
349 struct nlm_host *host = req->a_host;
350 struct rpc_clnt *clnt;
351 struct nlm_args *argp = &req->a_args;
352 struct nlm_res *resp = &req->a_res;
353 struct file *file = argp->lock.fl.fl_file;
354 struct rpc_message msg;
355 int status;
356
357 dprintk("lockd: call procedure %s on %s (async)\n",
358 nlm_procname(proc), host->h_name);
359
360 /* If we have no RPC client yet, create one. */
361 if ((clnt = nlm_bind_host(host)) == NULL)
362 return -ENOLCK;
363
364 /* bootstrap and kick off the async RPC call */
365 msg.rpc_proc = proc;
366 msg.rpc_argp = argp;
367 msg.rpc_resp =resp;
368 if (file)
369 msg.rpc_cred = nfs_file_cred(file);
370 else
371 msg.rpc_cred = NULL;
372 /* Increment host refcount */
373 nlm_get_host(host);
374 status = rpc_call_async(clnt, &msg, RPC_TASK_ASYNC, callback, req);
375 if (status < 0)
376 nlm_release_host(host);
377 return status;
378 }
379
380 /*
381 * TEST for the presence of a conflicting lock
382 */
383 static int
nlmclnt_test(struct nlm_rqst * req,struct file_lock * fl)384 nlmclnt_test(struct nlm_rqst *req, struct file_lock *fl)
385 {
386 int status;
387
388 if ((status = nlmclnt_call(req, NLMPROC_TEST)) < 0)
389 return status;
390
391 status = req->a_res.status;
392 if (status == NLM_LCK_GRANTED) {
393 fl->fl_type = F_UNLCK;
394 } if (status == NLM_LCK_DENIED) {
395 /*
396 * Report the conflicting lock back to the application.
397 * FIXME: Is it OK to report the pid back as well?
398 */
399 locks_copy_lock(fl, &req->a_res.lock.fl);
400 /* fl->fl_pid = 0; */
401 } else {
402 return nlm_stat_to_errno(req->a_res.status);
403 }
404
405 return 0;
406 }
407
408 static
nlmclnt_insert_lock_callback(struct file_lock * fl)409 void nlmclnt_insert_lock_callback(struct file_lock *fl)
410 {
411 nlm_get_host(fl->fl_u.nfs_fl.host);
412 }
413 static
nlmclnt_remove_lock_callback(struct file_lock * fl)414 void nlmclnt_remove_lock_callback(struct file_lock *fl)
415 {
416 if (fl->fl_u.nfs_fl.host) {
417 nlm_release_host(fl->fl_u.nfs_fl.host);
418 fl->fl_u.nfs_fl.host = NULL;
419 }
420 }
421
422 /*
423 * LOCK: Try to create a lock
424 *
425 * Programmer Harassment Alert
426 *
427 * When given a blocking lock request in a sync RPC call, the HPUX lockd
428 * will faithfully return LCK_BLOCKED but never cares to notify us when
429 * the lock could be granted. This way, our local process could hang
430 * around forever waiting for the callback.
431 *
432 * Solution A: Implement busy-waiting
433 * Solution B: Use the async version of the call (NLM_LOCK_{MSG,RES})
434 *
435 * For now I am implementing solution A, because I hate the idea of
436 * re-implementing lockd for a third time in two months. The async
437 * calls shouldn't be too hard to do, however.
438 *
439 * This is one of the lovely things about standards in the NFS area:
440 * they're so soft and squishy you can't really blame HP for doing this.
441 */
442 static int
nlmclnt_lock(struct nlm_rqst * req,struct file_lock * fl)443 nlmclnt_lock(struct nlm_rqst *req, struct file_lock *fl)
444 {
445 struct nlm_host *host = req->a_host;
446 struct nlm_res *resp = &req->a_res;
447 int status;
448
449 if (!host->h_monitored && nsm_monitor(host) < 0) {
450 printk(KERN_NOTICE "lockd: failed to monitor %s\n",
451 host->h_name);
452 return -ENOLCK;
453 }
454
455 do {
456 if ((status = nlmclnt_call(req, NLMPROC_LOCK)) >= 0) {
457 if (resp->status != NLM_LCK_BLOCKED)
458 break;
459 status = nlmclnt_block(host, fl, &resp->status);
460 }
461 if (status < 0)
462 return status;
463 } while (resp->status == NLM_LCK_BLOCKED && req->a_args.block);
464
465 if (resp->status == NLM_LCK_GRANTED) {
466 fl->fl_u.nfs_fl.state = host->h_state;
467 fl->fl_u.nfs_fl.flags |= NFS_LCK_GRANTED;
468 fl->fl_u.nfs_fl.host = host;
469 fl->fl_insert = nlmclnt_insert_lock_callback;
470 fl->fl_remove = nlmclnt_remove_lock_callback;
471 }
472
473 return nlm_stat_to_errno(resp->status);
474 }
475
476 /*
477 * RECLAIM: Try to reclaim a lock
478 */
479 int
nlmclnt_reclaim(struct nlm_host * host,struct file_lock * fl)480 nlmclnt_reclaim(struct nlm_host *host, struct file_lock *fl)
481 {
482 struct nlm_rqst reqst, *req;
483 int status;
484
485 req = &reqst;
486 memset(req, 0, sizeof(*req));
487 locks_init_lock(&req->a_args.lock.fl);
488 locks_init_lock(&req->a_res.lock.fl);
489 req->a_host = host;
490 req->a_flags = 0;
491
492 /* Set up the argument struct */
493 nlmclnt_setlockargs(req, fl);
494 req->a_args.reclaim = 1;
495
496 if ((status = nlmclnt_call(req, NLMPROC_LOCK)) >= 0
497 && req->a_res.status == NLM_LCK_GRANTED)
498 return 0;
499
500 printk(KERN_WARNING "lockd: failed to reclaim lock for pid %d "
501 "(errno %d, status %d)\n", fl->fl_pid,
502 status, req->a_res.status);
503
504 /*
505 * FIXME: This is a serious failure. We can
506 *
507 * a. Ignore the problem
508 * b. Send the owning process some signal (Linux doesn't have
509 * SIGLOST, though...)
510 * c. Retry the operation
511 *
512 * Until someone comes up with a simple implementation
513 * for b or c, I'll choose option a.
514 */
515
516 return -ENOLCK;
517 }
518
519 /*
520 * UNLOCK: remove an existing lock
521 */
522 static int
nlmclnt_unlock(struct nlm_rqst * req,struct file_lock * fl)523 nlmclnt_unlock(struct nlm_rqst *req, struct file_lock *fl)
524 {
525 struct nlm_res *resp = &req->a_res;
526 int status;
527
528 /* Clean the GRANTED flag now so the lock doesn't get
529 * reclaimed while we're stuck in the unlock call. */
530 fl->fl_u.nfs_fl.flags &= ~NFS_LCK_GRANTED;
531
532 if (req->a_flags & RPC_TASK_ASYNC) {
533 return nlmclnt_async_call(req, NLMPROC_UNLOCK,
534 nlmclnt_unlock_callback);
535 }
536
537 if ((status = nlmclnt_call(req, NLMPROC_UNLOCK)) < 0)
538 return status;
539
540 if (resp->status == NLM_LCK_GRANTED)
541 return 0;
542
543 if (resp->status != NLM_LCK_DENIED_NOLOCKS)
544 printk("lockd: unexpected unlock status: %d\n", resp->status);
545
546 /* What to do now? I'm out of my depth... */
547
548 return -ENOLCK;
549 }
550
551 static void
nlmclnt_unlock_callback(struct rpc_task * task)552 nlmclnt_unlock_callback(struct rpc_task *task)
553 {
554 struct nlm_rqst *req = (struct nlm_rqst *) task->tk_calldata;
555 int status = req->a_res.status;
556
557 if (RPC_ASSASSINATED(task))
558 goto die;
559
560 if (task->tk_status < 0) {
561 dprintk("lockd: unlock failed (err = %d)\n", -task->tk_status);
562 goto retry_rebind;
563 }
564 if (status == NLM_LCK_DENIED_GRACE_PERIOD) {
565 rpc_delay(task, NLMCLNT_GRACE_WAIT);
566 goto retry_unlock;
567 }
568 if (status != NLM_LCK_GRANTED)
569 printk(KERN_WARNING "lockd: unexpected unlock status: %d\n", status);
570
571 die:
572 nlm_release_host(req->a_host);
573 kfree(req);
574 return;
575 retry_rebind:
576 nlm_rebind_host(req->a_host);
577 retry_unlock:
578 rpc_restart_call(task);
579 }
580
581 /*
582 * Cancel a blocked lock request.
583 * We always use an async RPC call for this in order not to hang a
584 * process that has been Ctrl-C'ed.
585 */
586 int
nlmclnt_cancel(struct nlm_host * host,struct file_lock * fl)587 nlmclnt_cancel(struct nlm_host *host, struct file_lock *fl)
588 {
589 struct nlm_rqst *req;
590 unsigned long flags;
591 sigset_t oldset;
592 int status;
593
594 /* Block all signals while setting up call */
595 spin_lock_irqsave(¤t->sigmask_lock, flags);
596 oldset = current->blocked;
597 sigfillset(¤t->blocked);
598 recalc_sigpending(current);
599 spin_unlock_irqrestore(¤t->sigmask_lock, flags);
600
601 req = nlmclnt_alloc_call();
602 if (!req)
603 return -ENOMEM;
604 req->a_host = host;
605 req->a_flags = RPC_TASK_ASYNC;
606
607 nlmclnt_setlockargs(req, fl);
608
609 status = nlmclnt_async_call(req, NLMPROC_CANCEL,
610 nlmclnt_cancel_callback);
611 if (status < 0)
612 kfree(req);
613
614 spin_lock_irqsave(¤t->sigmask_lock, flags);
615 current->blocked = oldset;
616 recalc_sigpending(current);
617 spin_unlock_irqrestore(¤t->sigmask_lock, flags);
618
619 return status;
620 }
621
622 static void
nlmclnt_cancel_callback(struct rpc_task * task)623 nlmclnt_cancel_callback(struct rpc_task *task)
624 {
625 struct nlm_rqst *req = (struct nlm_rqst *) task->tk_calldata;
626
627 if (RPC_ASSASSINATED(task))
628 goto die;
629
630 if (task->tk_status < 0) {
631 dprintk("lockd: CANCEL call error %d, retrying.\n",
632 task->tk_status);
633 goto retry_cancel;
634 }
635
636 dprintk("lockd: cancel status %d (task %d)\n",
637 req->a_res.status, task->tk_pid);
638
639 switch (req->a_res.status) {
640 case NLM_LCK_GRANTED:
641 case NLM_LCK_DENIED_GRACE_PERIOD:
642 /* Everything's good */
643 break;
644 case NLM_LCK_DENIED_NOLOCKS:
645 dprintk("lockd: CANCEL failed (server has no locks)\n");
646 goto retry_cancel;
647 default:
648 printk(KERN_NOTICE "lockd: weird return %d for CANCEL call\n",
649 req->a_res.status);
650 }
651
652 die:
653 nlm_release_host(req->a_host);
654 kfree(req);
655 return;
656
657 retry_cancel:
658 nlm_rebind_host(req->a_host);
659 rpc_restart_call(task);
660 rpc_delay(task, 30 * HZ);
661 }
662
663 /*
664 * Convert an NLM status code to a generic kernel errno
665 */
666 static int
nlm_stat_to_errno(u32 status)667 nlm_stat_to_errno(u32 status)
668 {
669 switch(status) {
670 case NLM_LCK_GRANTED:
671 return 0;
672 case NLM_LCK_DENIED:
673 return -EAGAIN;
674 case NLM_LCK_DENIED_NOLOCKS:
675 case NLM_LCK_DENIED_GRACE_PERIOD:
676 return -ENOLCK;
677 case NLM_LCK_BLOCKED:
678 printk(KERN_NOTICE "lockd: unexpected status NLM_BLOCKED\n");
679 return -ENOLCK;
680 #ifdef CONFIG_LOCKD_V4
681 case NLM_DEADLCK:
682 return -EDEADLK;
683 case NLM_ROFS:
684 return -EROFS;
685 case NLM_STALE_FH:
686 return -ESTALE;
687 case NLM_FBIG:
688 return -EOVERFLOW;
689 case NLM_FAILED:
690 return -ENOLCK;
691 #endif
692 }
693 printk(KERN_NOTICE "lockd: unexpected server status %d\n", status);
694 return -ENOLCK;
695 }
696