2 * linux/fs/lockd/clntproc.c
4 * RPC procedures for the client side NLM implementation
6 * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
9 #include <linux/config.h>
10 #include <linux/module.h>
11 #include <linux/types.h>
12 #include <linux/errno.h>
14 #include <linux/nfs_fs.h>
15 #include <linux/utsname.h>
16 #include <linux/smp_lock.h>
17 #include <linux/sunrpc/clnt.h>
18 #include <linux/sunrpc/svc.h>
19 #include <linux/lockd/lockd.h>
20 #include <linux/lockd/sm_inter.h>
22 #define NLMDBG_FACILITY NLMDBG_CLIENT
23 #define NLMCLNT_GRACE_WAIT (5*HZ)
24 #define NLMCLNT_POLL_TIMEOUT (30*HZ)
26 static int nlmclnt_test(struct nlm_rqst
*, struct file_lock
*);
27 static int nlmclnt_lock(struct nlm_rqst
*, struct file_lock
*);
28 static int nlmclnt_unlock(struct nlm_rqst
*, struct file_lock
*);
29 static int nlm_stat_to_errno(u32 stat
);
30 static void nlmclnt_locks_init_private(struct file_lock
*fl
, struct nlm_host
*host
);
32 static const struct rpc_call_ops nlmclnt_unlock_ops
;
33 static const struct rpc_call_ops nlmclnt_cancel_ops
;
36 * Cookie counter for NLM requests
38 static u32 nlm_cookie
= 0x1234;
40 static inline void nlmclnt_next_cookie(struct nlm_cookie
*c
)
42 memcpy(c
->data
, &nlm_cookie
, 4);
43 memset(c
->data
+4, 0, 4);
48 static struct nlm_lockowner
*nlm_get_lockowner(struct nlm_lockowner
*lockowner
)
50 atomic_inc(&lockowner
->count
);
54 static void nlm_put_lockowner(struct nlm_lockowner
*lockowner
)
56 if (!atomic_dec_and_lock(&lockowner
->count
, &lockowner
->host
->h_lock
))
58 list_del(&lockowner
->list
);
59 spin_unlock(&lockowner
->host
->h_lock
);
60 nlm_release_host(lockowner
->host
);
64 static inline int nlm_pidbusy(struct nlm_host
*host
, uint32_t pid
)
66 struct nlm_lockowner
*lockowner
;
67 list_for_each_entry(lockowner
, &host
->h_lockowners
, list
) {
68 if (lockowner
->pid
== pid
)
74 static inline uint32_t __nlm_alloc_pid(struct nlm_host
*host
)
78 res
= host
->h_pidcount
++;
79 } while (nlm_pidbusy(host
, res
) < 0);
83 static struct nlm_lockowner
*__nlm_find_lockowner(struct nlm_host
*host
, fl_owner_t owner
)
85 struct nlm_lockowner
*lockowner
;
86 list_for_each_entry(lockowner
, &host
->h_lockowners
, list
) {
87 if (lockowner
->owner
!= owner
)
89 return nlm_get_lockowner(lockowner
);
94 static struct nlm_lockowner
*nlm_find_lockowner(struct nlm_host
*host
, fl_owner_t owner
)
96 struct nlm_lockowner
*res
, *new = NULL
;
98 spin_lock(&host
->h_lock
);
99 res
= __nlm_find_lockowner(host
, owner
);
101 spin_unlock(&host
->h_lock
);
102 new = (struct nlm_lockowner
*)kmalloc(sizeof(*new), GFP_KERNEL
);
103 spin_lock(&host
->h_lock
);
104 res
= __nlm_find_lockowner(host
, owner
);
105 if (res
== NULL
&& new != NULL
) {
107 atomic_set(&new->count
, 1);
109 new->pid
= __nlm_alloc_pid(host
);
110 new->host
= nlm_get_host(host
);
111 list_add(&new->list
, &host
->h_lockowners
);
115 spin_unlock(&host
->h_lock
);
121 * Initialize arguments for TEST/LOCK/UNLOCK/CANCEL calls
123 static void nlmclnt_setlockargs(struct nlm_rqst
*req
, struct file_lock
*fl
)
125 struct nlm_args
*argp
= &req
->a_args
;
126 struct nlm_lock
*lock
= &argp
->lock
;
128 nlmclnt_next_cookie(&argp
->cookie
);
129 argp
->state
= nsm_local_state
;
130 memcpy(&lock
->fh
, NFS_FH(fl
->fl_file
->f_dentry
->d_inode
), sizeof(struct nfs_fh
));
131 lock
->caller
= system_utsname
.nodename
;
132 lock
->oh
.data
= req
->a_owner
;
133 lock
->oh
.len
= sprintf(req
->a_owner
, "%d@%s",
134 current
->pid
, system_utsname
.nodename
);
135 locks_copy_lock(&lock
->fl
, fl
);
138 static void nlmclnt_release_lockargs(struct nlm_rqst
*req
)
140 struct file_lock
*fl
= &req
->a_args
.lock
.fl
;
142 if (fl
->fl_ops
&& fl
->fl_ops
->fl_release_private
)
143 fl
->fl_ops
->fl_release_private(fl
);
147 * Initialize arguments for GRANTED call. The nlm_rqst structure
148 * has been cleared already.
151 nlmclnt_setgrantargs(struct nlm_rqst
*call
, struct nlm_lock
*lock
)
153 locks_copy_lock(&call
->a_args
.lock
.fl
, &lock
->fl
);
154 memcpy(&call
->a_args
.lock
.fh
, &lock
->fh
, sizeof(call
->a_args
.lock
.fh
));
155 call
->a_args
.lock
.caller
= system_utsname
.nodename
;
156 call
->a_args
.lock
.oh
.len
= lock
->oh
.len
;
158 /* set default data area */
159 call
->a_args
.lock
.oh
.data
= call
->a_owner
;
161 if (lock
->oh
.len
> NLMCLNT_OHSIZE
) {
162 void *data
= kmalloc(lock
->oh
.len
, GFP_KERNEL
);
164 nlmclnt_freegrantargs(call
);
167 call
->a_args
.lock
.oh
.data
= (u8
*) data
;
170 memcpy(call
->a_args
.lock
.oh
.data
, lock
->oh
.data
, lock
->oh
.len
);
175 nlmclnt_freegrantargs(struct nlm_rqst
*call
)
177 struct file_lock
*fl
= &call
->a_args
.lock
.fl
;
179 * Check whether we allocated memory for the owner.
181 if (call
->a_args
.lock
.oh
.data
!= (u8
*) call
->a_owner
) {
182 kfree(call
->a_args
.lock
.oh
.data
);
184 if (fl
->fl_ops
&& fl
->fl_ops
->fl_release_private
)
185 fl
->fl_ops
->fl_release_private(fl
);
189 * This is the main entry point for the NLM client.
192 nlmclnt_proc(struct inode
*inode
, int cmd
, struct file_lock
*fl
)
194 struct nfs_server
*nfssrv
= NFS_SERVER(inode
);
195 struct nlm_host
*host
;
196 struct nlm_rqst reqst
, *call
= &reqst
;
199 int status
, proto
, vers
;
201 vers
= (NFS_PROTO(inode
)->version
== 3) ? 4 : 1;
202 if (NFS_PROTO(inode
)->version
> 3) {
203 printk(KERN_NOTICE
"NFSv4 file locking not implemented!\n");
207 /* Retrieve transport protocol from NFS client */
208 proto
= NFS_CLIENT(inode
)->cl_xprt
->prot
;
210 if (!(host
= nlmclnt_lookup_host(NFS_ADDR(inode
), proto
, vers
)))
213 /* Create RPC client handle if not there, and copy soft
214 * and intr flags from NFS client. */
215 if (host
->h_rpcclnt
== NULL
) {
216 struct rpc_clnt
*clnt
;
218 /* Bind an rpc client to this host handle (does not
219 * perform a portmapper lookup) */
220 if (!(clnt
= nlm_bind_host(host
))) {
224 clnt
->cl_softrtry
= nfssrv
->client
->cl_softrtry
;
225 clnt
->cl_intr
= nfssrv
->client
->cl_intr
;
228 /* Keep the old signal mask */
229 spin_lock_irqsave(¤t
->sighand
->siglock
, flags
);
230 oldset
= current
->blocked
;
232 /* If we're cleaning up locks because the process is exiting,
233 * perform the RPC call asynchronously. */
234 if ((IS_SETLK(cmd
) || IS_SETLKW(cmd
))
235 && fl
->fl_type
== F_UNLCK
236 && (current
->flags
& PF_EXITING
)) {
237 sigfillset(¤t
->blocked
); /* Mask all signals */
239 spin_unlock_irqrestore(¤t
->sighand
->siglock
, flags
);
241 call
= nlmclnt_alloc_call();
246 call
->a_flags
= RPC_TASK_ASYNC
;
248 spin_unlock_irqrestore(¤t
->sighand
->siglock
, flags
);
249 memset(call
, 0, sizeof(*call
));
250 locks_init_lock(&call
->a_args
.lock
.fl
);
251 locks_init_lock(&call
->a_res
.lock
.fl
);
255 nlmclnt_locks_init_private(fl
, host
);
257 /* Set up the argument struct */
258 nlmclnt_setlockargs(call
, fl
);
260 if (IS_SETLK(cmd
) || IS_SETLKW(cmd
)) {
261 if (fl
->fl_type
!= F_UNLCK
) {
262 call
->a_args
.block
= IS_SETLKW(cmd
) ? 1 : 0;
263 status
= nlmclnt_lock(call
, fl
);
265 status
= nlmclnt_unlock(call
, fl
);
266 } else if (IS_GETLK(cmd
))
267 status
= nlmclnt_test(call
, fl
);
272 spin_lock_irqsave(¤t
->sighand
->siglock
, flags
);
273 current
->blocked
= oldset
;
275 spin_unlock_irqrestore(¤t
->sighand
->siglock
, flags
);
278 dprintk("lockd: clnt proc returns %d\n", status
);
279 nlm_release_host(host
);
282 EXPORT_SYMBOL(nlmclnt_proc
);
285 * Allocate an NLM RPC call struct
288 nlmclnt_alloc_call(void)
290 struct nlm_rqst
*call
;
292 while (!signalled()) {
293 call
= (struct nlm_rqst
*) kmalloc(sizeof(struct nlm_rqst
), GFP_KERNEL
);
295 memset(call
, 0, sizeof(*call
));
296 locks_init_lock(&call
->a_args
.lock
.fl
);
297 locks_init_lock(&call
->a_res
.lock
.fl
);
300 printk("nlmclnt_alloc_call: failed, waiting for memory\n");
301 schedule_timeout_interruptible(5*HZ
);
306 static int nlm_wait_on_grace(wait_queue_head_t
*queue
)
311 prepare_to_wait(queue
, &wait
, TASK_INTERRUPTIBLE
);
313 schedule_timeout(NLMCLNT_GRACE_WAIT
);
318 finish_wait(queue
, &wait
);
326 nlmclnt_call(struct nlm_rqst
*req
, u32 proc
)
328 struct nlm_host
*host
= req
->a_host
;
329 struct rpc_clnt
*clnt
;
330 struct nlm_args
*argp
= &req
->a_args
;
331 struct nlm_res
*resp
= &req
->a_res
;
332 struct rpc_message msg
= {
338 dprintk("lockd: call procedure %d on %s\n",
339 (int)proc
, host
->h_name
);
342 if (host
->h_reclaiming
&& !argp
->reclaim
)
343 goto in_grace_period
;
345 /* If we have no RPC client yet, create one. */
346 if ((clnt
= nlm_bind_host(host
)) == NULL
)
348 msg
.rpc_proc
= &clnt
->cl_procinfo
[proc
];
350 /* Perform the RPC call. If an error occurs, try again */
351 if ((status
= rpc_call_sync(clnt
, &msg
, 0)) < 0) {
352 dprintk("lockd: rpc_call returned error %d\n", -status
);
354 case -EPROTONOSUPPORT
:
360 nlm_rebind_host(host
);
364 return signalled () ? -EINTR
: status
;
370 if (resp
->status
== NLM_LCK_DENIED_GRACE_PERIOD
) {
371 dprintk("lockd: server in grace period\n");
374 "lockd: spurious grace period reject?!\n");
378 if (!argp
->reclaim
) {
379 /* We appear to be out of the grace period */
380 wake_up_all(&host
->h_gracewait
);
382 dprintk("lockd: server returns status %d\n", resp
->status
);
383 return 0; /* Okay, call complete */
388 * The server has rebooted and appears to be in the grace
389 * period during which locks are only allowed to be
391 * We can only back off and try again later.
393 status
= nlm_wait_on_grace(&host
->h_gracewait
);
394 } while (status
== 0);
400 * Generic NLM call, async version.
402 int nlmsvc_async_call(struct nlm_rqst
*req
, u32 proc
, const struct rpc_call_ops
*tk_ops
)
404 struct nlm_host
*host
= req
->a_host
;
405 struct rpc_clnt
*clnt
;
406 struct rpc_message msg
= {
407 .rpc_argp
= &req
->a_args
,
408 .rpc_resp
= &req
->a_res
,
412 dprintk("lockd: call procedure %d on %s (async)\n",
413 (int)proc
, host
->h_name
);
415 /* If we have no RPC client yet, create one. */
416 if ((clnt
= nlm_bind_host(host
)) == NULL
)
418 msg
.rpc_proc
= &clnt
->cl_procinfo
[proc
];
420 /* bootstrap and kick off the async RPC call */
421 status
= rpc_call_async(clnt
, &msg
, RPC_TASK_ASYNC
, tk_ops
, req
);
426 static int nlmclnt_async_call(struct nlm_rqst
*req
, u32 proc
, const struct rpc_call_ops
*tk_ops
)
428 struct nlm_host
*host
= req
->a_host
;
429 struct rpc_clnt
*clnt
;
430 struct nlm_args
*argp
= &req
->a_args
;
431 struct nlm_res
*resp
= &req
->a_res
;
432 struct rpc_message msg
= {
438 dprintk("lockd: call procedure %d on %s (async)\n",
439 (int)proc
, host
->h_name
);
441 /* If we have no RPC client yet, create one. */
442 if ((clnt
= nlm_bind_host(host
)) == NULL
)
444 msg
.rpc_proc
= &clnt
->cl_procinfo
[proc
];
446 /* Increment host refcount */
448 /* bootstrap and kick off the async RPC call */
449 status
= rpc_call_async(clnt
, &msg
, RPC_TASK_ASYNC
, tk_ops
, req
);
451 nlm_release_host(host
);
456 * TEST for the presence of a conflicting lock
459 nlmclnt_test(struct nlm_rqst
*req
, struct file_lock
*fl
)
463 status
= nlmclnt_call(req
, NLMPROC_TEST
);
464 nlmclnt_release_lockargs(req
);
468 status
= req
->a_res
.status
;
469 if (status
== NLM_LCK_GRANTED
) {
470 fl
->fl_type
= F_UNLCK
;
471 } if (status
== NLM_LCK_DENIED
) {
473 * Report the conflicting lock back to the application.
475 locks_copy_lock(fl
, &req
->a_res
.lock
.fl
);
478 return nlm_stat_to_errno(req
->a_res
.status
);
484 static void nlmclnt_locks_copy_lock(struct file_lock
*new, struct file_lock
*fl
)
486 memcpy(&new->fl_u
.nfs_fl
, &fl
->fl_u
.nfs_fl
, sizeof(new->fl_u
.nfs_fl
));
487 nlm_get_lockowner(new->fl_u
.nfs_fl
.owner
);
490 static void nlmclnt_locks_release_private(struct file_lock
*fl
)
492 nlm_put_lockowner(fl
->fl_u
.nfs_fl
.owner
);
496 static struct file_lock_operations nlmclnt_lock_ops
= {
497 .fl_copy_lock
= nlmclnt_locks_copy_lock
,
498 .fl_release_private
= nlmclnt_locks_release_private
,
501 static void nlmclnt_locks_init_private(struct file_lock
*fl
, struct nlm_host
*host
)
503 BUG_ON(fl
->fl_ops
!= NULL
);
504 fl
->fl_u
.nfs_fl
.state
= 0;
505 fl
->fl_u
.nfs_fl
.flags
= 0;
506 fl
->fl_u
.nfs_fl
.owner
= nlm_find_lockowner(host
, fl
->fl_owner
);
507 fl
->fl_ops
= &nlmclnt_lock_ops
;
510 static void do_vfs_lock(struct file_lock
*fl
)
513 switch (fl
->fl_flags
& (FL_POSIX
|FL_FLOCK
)) {
515 res
= posix_lock_file_wait(fl
->fl_file
, fl
);
518 res
= flock_lock_file_wait(fl
->fl_file
, fl
);
524 printk(KERN_WARNING
"%s: VFS is out of sync with lock manager!\n",
529 * LOCK: Try to create a lock
531 * Programmer Harassment Alert
533 * When given a blocking lock request in a sync RPC call, the HPUX lockd
534 * will faithfully return LCK_BLOCKED but never cares to notify us when
535 * the lock could be granted. This way, our local process could hang
536 * around forever waiting for the callback.
538 * Solution A: Implement busy-waiting
539 * Solution B: Use the async version of the call (NLM_LOCK_{MSG,RES})
541 * For now I am implementing solution A, because I hate the idea of
542 * re-implementing lockd for a third time in two months. The async
543 * calls shouldn't be too hard to do, however.
545 * This is one of the lovely things about standards in the NFS area:
546 * they're so soft and squishy you can't really blame HP for doing this.
549 nlmclnt_lock(struct nlm_rqst
*req
, struct file_lock
*fl
)
551 struct nlm_host
*host
= req
->a_host
;
552 struct nlm_res
*resp
= &req
->a_res
;
556 if (!host
->h_monitored
&& nsm_monitor(host
) < 0) {
557 printk(KERN_NOTICE
"lockd: failed to monitor %s\n",
563 if (req
->a_args
.block
) {
564 status
= nlmclnt_prepare_block(req
, host
, fl
);
569 status
= nlmclnt_call(req
, NLMPROC_LOCK
);
572 if (resp
->status
!= NLM_LCK_BLOCKED
)
574 /* Wait on an NLM blocking lock */
575 timeout
= nlmclnt_block(req
, NLMCLNT_POLL_TIMEOUT
);
576 /* Did a reclaimer thread notify us of a server reboot? */
577 if (resp
->status
== NLM_LCK_DENIED_GRACE_PERIOD
)
579 if (resp
->status
!= NLM_LCK_BLOCKED
)
583 /* We were interrupted. Send a CANCEL request to the server
586 status
= (int)timeout
;
590 if (resp
->status
== NLM_LCK_GRANTED
) {
591 fl
->fl_u
.nfs_fl
.state
= host
->h_state
;
592 fl
->fl_u
.nfs_fl
.flags
|= NFS_LCK_GRANTED
;
593 fl
->fl_flags
|= FL_SLEEP
;
596 status
= nlm_stat_to_errno(resp
->status
);
598 nlmclnt_finish_block(req
);
599 /* Cancel the blocked request if it is still pending */
600 if (resp
->status
== NLM_LCK_BLOCKED
)
601 nlmclnt_cancel(host
, fl
);
603 nlmclnt_release_lockargs(req
);
608 * RECLAIM: Try to reclaim a lock
611 nlmclnt_reclaim(struct nlm_host
*host
, struct file_lock
*fl
)
613 struct nlm_rqst reqst
, *req
;
617 memset(req
, 0, sizeof(*req
));
618 locks_init_lock(&req
->a_args
.lock
.fl
);
619 locks_init_lock(&req
->a_res
.lock
.fl
);
623 /* Set up the argument struct */
624 nlmclnt_setlockargs(req
, fl
);
625 req
->a_args
.reclaim
= 1;
627 if ((status
= nlmclnt_call(req
, NLMPROC_LOCK
)) >= 0
628 && req
->a_res
.status
== NLM_LCK_GRANTED
)
631 printk(KERN_WARNING
"lockd: failed to reclaim lock for pid %d "
632 "(errno %d, status %d)\n", fl
->fl_pid
,
633 status
, req
->a_res
.status
);
636 * FIXME: This is a serious failure. We can
638 * a. Ignore the problem
639 * b. Send the owning process some signal (Linux doesn't have
640 * SIGLOST, though...)
641 * c. Retry the operation
643 * Until someone comes up with a simple implementation
644 * for b or c, I'll choose option a.
651 * UNLOCK: remove an existing lock
654 nlmclnt_unlock(struct nlm_rqst
*req
, struct file_lock
*fl
)
656 struct nlm_res
*resp
= &req
->a_res
;
659 /* Clean the GRANTED flag now so the lock doesn't get
660 * reclaimed while we're stuck in the unlock call. */
661 fl
->fl_u
.nfs_fl
.flags
&= ~NFS_LCK_GRANTED
;
663 if (req
->a_flags
& RPC_TASK_ASYNC
) {
664 status
= nlmclnt_async_call(req
, NLMPROC_UNLOCK
,
665 &nlmclnt_unlock_ops
);
666 /* Hrmf... Do the unlock early since locks_remove_posix()
667 * really expects us to free the lock synchronously */
670 nlmclnt_release_lockargs(req
);
676 status
= nlmclnt_call(req
, NLMPROC_UNLOCK
);
677 nlmclnt_release_lockargs(req
);
682 if (resp
->status
== NLM_LCK_GRANTED
)
685 if (resp
->status
!= NLM_LCK_DENIED_NOLOCKS
)
686 printk("lockd: unexpected unlock status: %d\n", resp
->status
);
688 /* What to do now? I'm out of my depth... */
693 static void nlmclnt_unlock_callback(struct rpc_task
*task
, void *data
)
695 struct nlm_rqst
*req
= data
;
696 int status
= req
->a_res
.status
;
698 if (RPC_ASSASSINATED(task
))
701 if (task
->tk_status
< 0) {
702 dprintk("lockd: unlock failed (err = %d)\n", -task
->tk_status
);
705 if (status
== NLM_LCK_DENIED_GRACE_PERIOD
) {
706 rpc_delay(task
, NLMCLNT_GRACE_WAIT
);
709 if (status
!= NLM_LCK_GRANTED
)
710 printk(KERN_WARNING
"lockd: unexpected unlock status: %d\n", status
);
712 nlm_release_host(req
->a_host
);
713 nlmclnt_release_lockargs(req
);
717 nlm_rebind_host(req
->a_host
);
719 rpc_restart_call(task
);
722 static const struct rpc_call_ops nlmclnt_unlock_ops
= {
723 .rpc_call_done
= nlmclnt_unlock_callback
,
727 * Cancel a blocked lock request.
728 * We always use an async RPC call for this in order not to hang a
729 * process that has been Ctrl-C'ed.
732 nlmclnt_cancel(struct nlm_host
*host
, struct file_lock
*fl
)
734 struct nlm_rqst
*req
;
739 /* Block all signals while setting up call */
740 spin_lock_irqsave(¤t
->sighand
->siglock
, flags
);
741 oldset
= current
->blocked
;
742 sigfillset(¤t
->blocked
);
744 spin_unlock_irqrestore(¤t
->sighand
->siglock
, flags
);
746 req
= nlmclnt_alloc_call();
750 req
->a_flags
= RPC_TASK_ASYNC
;
752 nlmclnt_setlockargs(req
, fl
);
754 status
= nlmclnt_async_call(req
, NLMPROC_CANCEL
, &nlmclnt_cancel_ops
);
756 nlmclnt_release_lockargs(req
);
760 spin_lock_irqsave(¤t
->sighand
->siglock
, flags
);
761 current
->blocked
= oldset
;
763 spin_unlock_irqrestore(¤t
->sighand
->siglock
, flags
);
768 static void nlmclnt_cancel_callback(struct rpc_task
*task
, void *data
)
770 struct nlm_rqst
*req
= data
;
772 if (RPC_ASSASSINATED(task
))
775 if (task
->tk_status
< 0) {
776 dprintk("lockd: CANCEL call error %d, retrying.\n",
781 dprintk("lockd: cancel status %d (task %d)\n",
782 req
->a_res
.status
, task
->tk_pid
);
784 switch (req
->a_res
.status
) {
785 case NLM_LCK_GRANTED
:
786 case NLM_LCK_DENIED_GRACE_PERIOD
:
787 /* Everything's good */
789 case NLM_LCK_DENIED_NOLOCKS
:
790 dprintk("lockd: CANCEL failed (server has no locks)\n");
793 printk(KERN_NOTICE
"lockd: weird return %d for CANCEL call\n",
798 nlm_release_host(req
->a_host
);
799 nlmclnt_release_lockargs(req
);
804 nlm_rebind_host(req
->a_host
);
805 rpc_restart_call(task
);
806 rpc_delay(task
, 30 * HZ
);
809 static const struct rpc_call_ops nlmclnt_cancel_ops
= {
810 .rpc_call_done
= nlmclnt_cancel_callback
,
814 * Convert an NLM status code to a generic kernel errno
817 nlm_stat_to_errno(u32 status
)
820 case NLM_LCK_GRANTED
:
824 case NLM_LCK_DENIED_NOLOCKS
:
825 case NLM_LCK_DENIED_GRACE_PERIOD
:
827 case NLM_LCK_BLOCKED
:
828 printk(KERN_NOTICE
"lockd: unexpected status NLM_BLOCKED\n");
830 #ifdef CONFIG_LOCKD_V4
843 printk(KERN_NOTICE
"lockd: unexpected server status %d\n", status
);