2 * Copyright (c) 2001 The Regents of the University of Michigan.
5 * Kendrick Smith <kmsmith@umich.edu>
6 * Andy Adamson <andros@umich.edu>
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the University nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
22 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
23 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
24 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
28 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
29 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
31 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 #include <linux/sunrpc/clnt.h>
35 #include <linux/sunrpc/svc_xprt.h>
36 #include <linux/slab.h>
40 #define NFSDDBG_FACILITY NFSDDBG_PROC
42 #define NFSPROC4_CB_NULL 0
43 #define NFSPROC4_CB_COMPOUND 1
44 #define NFS4_STATEID_SIZE 16
46 /* Index of predefined Linux callback client operations */
49 NFSPROC4_CLNT_CB_NULL
= 0,
50 NFSPROC4_CLNT_CB_RECALL
,
51 NFSPROC4_CLNT_CB_SEQUENCE
,
59 #define NFS4_MAXTAGLEN 20
61 #define NFS4_enc_cb_null_sz 0
62 #define NFS4_dec_cb_null_sz 0
63 #define cb_compound_enc_hdr_sz 4
64 #define cb_compound_dec_hdr_sz (3 + (NFS4_MAXTAGLEN >> 2))
65 #define sessionid_sz (NFS4_MAX_SESSIONID_LEN >> 2)
66 #define cb_sequence_enc_sz (sessionid_sz + 4 + \
67 1 /* no referring calls list yet */)
68 #define cb_sequence_dec_sz (op_dec_sz + sessionid_sz + 4)
72 #define enc_nfs4_fh_sz (1 + (NFS4_FHSIZE >> 2))
73 #define enc_stateid_sz (NFS4_STATEID_SIZE >> 2)
74 #define NFS4_enc_cb_recall_sz (cb_compound_enc_hdr_sz + \
75 cb_sequence_enc_sz + \
76 1 + enc_stateid_sz + \
79 #define NFS4_dec_cb_recall_sz (cb_compound_dec_hdr_sz + \
80 cb_sequence_dec_sz + \
84 * Generic encode routines from fs/nfs/nfs4xdr.c
86 static inline __be32
*
87 xdr_writemem(__be32
*p
, const void *ptr
, int nbytes
)
89 int tmp
= XDR_QUADLEN(nbytes
);
93 memcpy(p
, ptr
, nbytes
);
97 #define WRITE32(n) *p++ = htonl(n)
98 #define WRITEMEM(ptr,nbytes) do { \
99 p = xdr_writemem(p, ptr, nbytes); \
101 #define RESERVE_SPACE(nbytes) do { \
102 p = xdr_reserve_space(xdr, nbytes); \
103 if (!p) dprintk("NFSD: RESERVE_SPACE(%d) failed in function %s\n", (int) (nbytes), __func__); \
108 * Generic decode routines from fs/nfs/nfs4xdr.c
110 #define DECODE_TAIL \
115 dprintk("NFSD: xdr error! (%s:%d)\n", __FILE__, __LINE__); \
119 #define READ32(x) (x) = ntohl(*p++)
120 #define READ64(x) do { \
121 (x) = (u64)ntohl(*p++) << 32; \
122 (x) |= ntohl(*p++); \
124 #define READTIME(x) do { \
126 (x.tv_sec) = ntohl(*p++); \
127 (x.tv_nsec) = ntohl(*p++); \
129 #define READ_BUF(nbytes) do { \
130 p = xdr_inline_decode(xdr, nbytes); \
132 dprintk("NFSD: %s: reply buffer overflowed in line %d.\n", \
133 __func__, __LINE__); \
138 struct nfs4_cb_compound_hdr
{
140 u32 ident
; /* minorversion 0 only */
151 } nfs_cb_errtbl
[] = {
153 { NFS4ERR_PERM
, EPERM
},
154 { NFS4ERR_NOENT
, ENOENT
},
156 { NFS4ERR_NXIO
, ENXIO
},
157 { NFS4ERR_ACCESS
, EACCES
},
158 { NFS4ERR_EXIST
, EEXIST
},
159 { NFS4ERR_XDEV
, EXDEV
},
160 { NFS4ERR_NOTDIR
, ENOTDIR
},
161 { NFS4ERR_ISDIR
, EISDIR
},
162 { NFS4ERR_INVAL
, EINVAL
},
163 { NFS4ERR_FBIG
, EFBIG
},
164 { NFS4ERR_NOSPC
, ENOSPC
},
165 { NFS4ERR_ROFS
, EROFS
},
166 { NFS4ERR_MLINK
, EMLINK
},
167 { NFS4ERR_NAMETOOLONG
, ENAMETOOLONG
},
168 { NFS4ERR_NOTEMPTY
, ENOTEMPTY
},
169 { NFS4ERR_DQUOT
, EDQUOT
},
170 { NFS4ERR_STALE
, ESTALE
},
171 { NFS4ERR_BADHANDLE
, EBADHANDLE
},
172 { NFS4ERR_BAD_COOKIE
, EBADCOOKIE
},
173 { NFS4ERR_NOTSUPP
, ENOTSUPP
},
174 { NFS4ERR_TOOSMALL
, ETOOSMALL
},
175 { NFS4ERR_SERVERFAULT
, ESERVERFAULT
},
176 { NFS4ERR_BADTYPE
, EBADTYPE
},
177 { NFS4ERR_LOCKED
, EAGAIN
},
178 { NFS4ERR_RESOURCE
, EREMOTEIO
},
179 { NFS4ERR_SYMLINK
, ELOOP
},
180 { NFS4ERR_OP_ILLEGAL
, EOPNOTSUPP
},
181 { NFS4ERR_DEADLOCK
, EDEADLK
},
186 nfs_cb_stat_to_errno(int stat
)
189 for (i
= 0; nfs_cb_errtbl
[i
].stat
!= -1; i
++) {
190 if (nfs_cb_errtbl
[i
].stat
== stat
)
191 return nfs_cb_errtbl
[i
].errno
;
193 /* If we cannot translate the error, the recovery routines should
195 * Note: remaining NFSv4 error codes have values > 10000, so should
196 * not conflict with native Linux error codes.
206 encode_stateid(struct xdr_stream
*xdr
, stateid_t
*sid
)
210 RESERVE_SPACE(sizeof(stateid_t
));
211 WRITE32(sid
->si_generation
);
212 WRITEMEM(&sid
->si_opaque
, sizeof(stateid_opaque_t
));
216 encode_cb_compound_hdr(struct xdr_stream
*xdr
, struct nfs4_cb_compound_hdr
*hdr
)
221 WRITE32(0); /* tag length is always 0 */
222 WRITE32(hdr
->minorversion
);
228 static void encode_cb_nops(struct nfs4_cb_compound_hdr
*hdr
)
230 *hdr
->nops_p
= htonl(hdr
->nops
);
234 encode_cb_recall(struct xdr_stream
*xdr
, struct nfs4_delegation
*dp
,
235 struct nfs4_cb_compound_hdr
*hdr
)
238 int len
= dp
->dl_fh
.fh_size
;
241 WRITE32(OP_CB_RECALL
);
242 encode_stateid(xdr
, &dp
->dl_stateid
);
243 RESERVE_SPACE(8 + (XDR_QUADLEN(len
) << 2));
244 WRITE32(0); /* truncate optimization not implemented */
246 WRITEMEM(&dp
->dl_fh
.fh_base
, len
);
251 encode_cb_sequence(struct xdr_stream
*xdr
, struct nfsd4_cb_sequence
*args
,
252 struct nfs4_cb_compound_hdr
*hdr
)
256 if (hdr
->minorversion
== 0)
259 RESERVE_SPACE(1 + NFS4_MAX_SESSIONID_LEN
+ 20);
261 WRITE32(OP_CB_SEQUENCE
);
262 WRITEMEM(args
->cbs_clp
->cl_sessionid
.data
, NFS4_MAX_SESSIONID_LEN
);
263 WRITE32(args
->cbs_clp
->cl_cb_seq_nr
);
264 WRITE32(0); /* slotid, always 0 */
265 WRITE32(0); /* highest slotid always 0 */
266 WRITE32(0); /* cachethis always 0 */
272 nfs4_xdr_enc_cb_null(struct rpc_rqst
*req
, __be32
*p
)
274 struct xdr_stream xdrs
, *xdr
= &xdrs
;
276 xdr_init_encode(&xdrs
, &req
->rq_snd_buf
, p
);
282 nfs4_xdr_enc_cb_recall(struct rpc_rqst
*req
, __be32
*p
,
283 struct nfs4_rpc_args
*rpc_args
)
285 struct xdr_stream xdr
;
286 struct nfs4_delegation
*args
= rpc_args
->args_op
;
287 struct nfs4_cb_compound_hdr hdr
= {
288 .ident
= args
->dl_ident
,
289 .minorversion
= rpc_args
->args_seq
.cbs_minorversion
,
292 xdr_init_encode(&xdr
, &req
->rq_snd_buf
, p
);
293 encode_cb_compound_hdr(&xdr
, &hdr
);
294 encode_cb_sequence(&xdr
, &rpc_args
->args_seq
, &hdr
);
295 encode_cb_recall(&xdr
, args
, &hdr
);
296 encode_cb_nops(&hdr
);
302 decode_cb_compound_hdr(struct xdr_stream
*xdr
, struct nfs4_cb_compound_hdr
*hdr
){
308 /* We've got no use for the tag; ignore it: */
310 READ_BUF(taglen
+ 4);
311 p
+= XDR_QUADLEN(taglen
);
317 decode_cb_op_hdr(struct xdr_stream
*xdr
, enum nfs_opnum4 expected
)
325 if (op
!= expected
) {
326 dprintk("NFSD: decode_cb_op_hdr: Callback server returned "
327 " operation %d but we issued a request for %d\n",
332 if (nfserr
!= NFS_OK
)
333 return -nfs_cb_stat_to_errno(nfserr
);
338 * Our current back channel implmentation supports a single backchannel
339 * with a single slot.
342 decode_cb_sequence(struct xdr_stream
*xdr
, struct nfsd4_cb_sequence
*res
,
343 struct rpc_rqst
*rqstp
)
345 struct nfs4_sessionid id
;
350 if (res
->cbs_minorversion
== 0)
353 status
= decode_cb_op_hdr(xdr
, OP_CB_SEQUENCE
);
358 * If the server returns different values for sessionID, slotID or
359 * sequence number, the server is looney tunes.
361 status
= -ESERVERFAULT
;
363 READ_BUF(NFS4_MAX_SESSIONID_LEN
+ 16);
364 memcpy(id
.data
, p
, NFS4_MAX_SESSIONID_LEN
);
365 p
+= XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN
);
366 if (memcmp(id
.data
, res
->cbs_clp
->cl_sessionid
.data
,
367 NFS4_MAX_SESSIONID_LEN
)) {
368 dprintk("%s Invalid session id\n", __func__
);
372 if (dummy
!= res
->cbs_clp
->cl_cb_seq_nr
) {
373 dprintk("%s Invalid sequence number\n", __func__
);
376 READ32(dummy
); /* slotid must be 0 */
378 dprintk("%s Invalid slotid\n", __func__
);
388 nfs4_xdr_dec_cb_null(struct rpc_rqst
*req
, __be32
*p
)
394 nfs4_xdr_dec_cb_recall(struct rpc_rqst
*rqstp
, __be32
*p
,
395 struct nfsd4_cb_sequence
*seq
)
397 struct xdr_stream xdr
;
398 struct nfs4_cb_compound_hdr hdr
;
401 xdr_init_decode(&xdr
, &rqstp
->rq_rcv_buf
, p
);
402 status
= decode_cb_compound_hdr(&xdr
, &hdr
);
406 status
= decode_cb_sequence(&xdr
, seq
, rqstp
);
410 status
= decode_cb_op_hdr(&xdr
, OP_CB_RECALL
);
416 * RPC procedure tables
418 #define PROC(proc, call, argtype, restype) \
419 [NFSPROC4_CLNT_##proc] = { \
420 .p_proc = NFSPROC4_CB_##call, \
421 .p_encode = (kxdrproc_t) nfs4_xdr_##argtype, \
422 .p_decode = (kxdrproc_t) nfs4_xdr_##restype, \
423 .p_arglen = NFS4_##argtype##_sz, \
424 .p_replen = NFS4_##restype##_sz, \
425 .p_statidx = NFSPROC4_CB_##call, \
429 static struct rpc_procinfo nfs4_cb_procedures
[] = {
430 PROC(CB_NULL
, NULL
, enc_cb_null
, dec_cb_null
),
431 PROC(CB_RECALL
, COMPOUND
, enc_cb_recall
, dec_cb_recall
),
434 static struct rpc_version nfs_cb_version4
= {
436 * Note on the callback rpc program version number: despite language in rfc
437 * 5661 section 18.36.3 requiring servers to use 4 in this field, the
438 * official xdr descriptions for both 4.0 and 4.1 specify version 1, and
439 * in practice that appears to be what implementations use. The section
440 * 18.36.3 language is expected to be fixed in an erratum.
443 .nrprocs
= ARRAY_SIZE(nfs4_cb_procedures
),
444 .procs
= nfs4_cb_procedures
447 static struct rpc_version
* nfs_cb_version
[] = {
451 static struct rpc_program cb_program
;
453 static struct rpc_stat cb_stats
= {
454 .program
= &cb_program
457 #define NFS4_CALLBACK 0x40000000
458 static struct rpc_program cb_program
= {
460 .number
= NFS4_CALLBACK
,
461 .nrvers
= ARRAY_SIZE(nfs_cb_version
),
462 .version
= nfs_cb_version
,
464 .pipe_dir_name
= "/nfsd4_cb",
467 static int max_cb_time(void)
469 return max(nfsd4_lease
/10, (time_t)1) * HZ
;
472 /* Reference counting, callback cleanup, etc., all look racy as heck.
473 * And why is cl_cb_set an atomic? */
475 int setup_callback_client(struct nfs4_client
*clp
, struct nfs4_cb_conn
*cb
)
477 struct rpc_timeout timeparms
= {
478 .to_initval
= max_cb_time(),
481 struct rpc_create_args args
= {
482 .protocol
= XPRT_TRANSPORT_TCP
,
483 .address
= (struct sockaddr
*) &cb
->cb_addr
,
484 .addrsize
= cb
->cb_addrlen
,
485 .timeout
= &timeparms
,
486 .program
= &cb_program
,
487 .prognumber
= cb
->cb_prog
,
489 .authflavor
= clp
->cl_flavor
,
490 .flags
= (RPC_CLNT_CREATE_NOPING
| RPC_CLNT_CREATE_QUIET
),
491 .client_name
= clp
->cl_principal
,
493 struct rpc_clnt
*client
;
495 if (!clp
->cl_principal
&& (clp
->cl_flavor
>= RPC_AUTH_GSS_KRB5
))
497 if (cb
->cb_minorversion
) {
498 args
.bc_xprt
= cb
->cb_xprt
;
499 args
.protocol
= XPRT_TRANSPORT_BC_TCP
;
501 /* Create RPC client */
502 client
= rpc_create(&args
);
503 if (IS_ERR(client
)) {
504 dprintk("NFSD: couldn't create callback client: %ld\n",
506 return PTR_ERR(client
);
508 nfsd4_set_callback_client(clp
, client
);
513 static void warn_no_callback_path(struct nfs4_client
*clp
, int reason
)
515 dprintk("NFSD: warning: no callback path to client %.*s: error %d\n",
516 (int)clp
->cl_name
.len
, clp
->cl_name
.data
, reason
);
519 static void nfsd4_cb_probe_done(struct rpc_task
*task
, void *calldata
)
521 struct nfs4_client
*clp
= calldata
;
524 warn_no_callback_path(clp
, task
->tk_status
);
526 atomic_set(&clp
->cl_cb_set
, 1);
529 static const struct rpc_call_ops nfsd4_cb_probe_ops
= {
530 .rpc_call_done
= nfsd4_cb_probe_done
,
533 static struct rpc_cred
*callback_cred
;
535 int set_callback_cred(void)
539 callback_cred
= rpc_lookup_machine_cred();
546 void do_probe_callback(struct nfs4_client
*clp
)
548 struct rpc_message msg
= {
549 .rpc_proc
= &nfs4_cb_procedures
[NFSPROC4_CLNT_CB_NULL
],
551 .rpc_cred
= callback_cred
555 status
= rpc_call_async(clp
->cl_cb_client
, &msg
,
556 RPC_TASK_SOFT
| RPC_TASK_SOFTCONN
,
557 &nfsd4_cb_probe_ops
, (void *)clp
);
559 warn_no_callback_path(clp
, status
);
563 * Set up the callback client and put a NFSPROC4_CB_NULL on the wire...
565 void nfsd4_probe_callback(struct nfs4_client
*clp
, struct nfs4_cb_conn
*cb
)
569 BUG_ON(atomic_read(&clp
->cl_cb_set
));
571 status
= setup_callback_client(clp
, cb
);
573 warn_no_callback_path(clp
, status
);
576 do_probe_callback(clp
);
580 * There's currently a single callback channel slot.
581 * If the slot is available, then mark it busy. Otherwise, set the
582 * thread for sleeping on the callback RPC wait queue.
584 static int nfsd41_cb_setup_sequence(struct nfs4_client
*clp
,
585 struct rpc_task
*task
)
587 struct nfs4_rpc_args
*args
= task
->tk_msg
.rpc_argp
;
588 u32
*ptr
= (u32
*)clp
->cl_sessionid
.data
;
591 dprintk("%s: %u:%u:%u:%u\n", __func__
,
592 ptr
[0], ptr
[1], ptr
[2], ptr
[3]);
594 if (test_and_set_bit(0, &clp
->cl_cb_slot_busy
) != 0) {
595 rpc_sleep_on(&clp
->cl_cb_waitq
, task
, NULL
);
596 dprintk("%s slot is busy\n", __func__
);
602 * We'll need the clp during XDR encoding and decoding,
603 * and the sequence during decoding to verify the reply
605 args
->args_seq
.cbs_clp
= clp
;
606 task
->tk_msg
.rpc_resp
= &args
->args_seq
;
609 dprintk("%s status=%d\n", __func__
, status
);
614 * TODO: cb_sequence should support referring call lists, cachethis, multiple
615 * slots, and mark callback channel down on communication errors.
617 static void nfsd4_cb_prepare(struct rpc_task
*task
, void *calldata
)
619 struct nfs4_delegation
*dp
= calldata
;
620 struct nfs4_client
*clp
= dp
->dl_client
;
621 struct nfs4_rpc_args
*args
= task
->tk_msg
.rpc_argp
;
622 u32 minorversion
= clp
->cl_cb_conn
.cb_minorversion
;
625 args
->args_seq
.cbs_minorversion
= minorversion
;
627 status
= nfsd41_cb_setup_sequence(clp
, task
);
629 if (status
!= -EAGAIN
) {
630 /* terminate rpc task */
631 task
->tk_status
= status
;
632 task
->tk_action
= NULL
;
637 rpc_call_start(task
);
640 static void nfsd4_cb_done(struct rpc_task
*task
, void *calldata
)
642 struct nfs4_delegation
*dp
= calldata
;
643 struct nfs4_client
*clp
= dp
->dl_client
;
645 dprintk("%s: minorversion=%d\n", __func__
,
646 clp
->cl_cb_conn
.cb_minorversion
);
648 if (clp
->cl_cb_conn
.cb_minorversion
) {
649 /* No need for lock, access serialized in nfsd4_cb_prepare */
651 clear_bit(0, &clp
->cl_cb_slot_busy
);
652 rpc_wake_up_next(&clp
->cl_cb_waitq
);
653 dprintk("%s: freed slot, new seqid=%d\n", __func__
,
656 /* We're done looking into the sequence information */
657 task
->tk_msg
.rpc_resp
= NULL
;
662 static void nfsd4_cb_recall_done(struct rpc_task
*task
, void *calldata
)
664 struct nfs4_delegation
*dp
= calldata
;
665 struct nfs4_client
*clp
= dp
->dl_client
;
666 struct rpc_clnt
*current_rpc_client
= clp
->cl_cb_client
;
668 nfsd4_cb_done(task
, calldata
);
670 if (current_rpc_client
== NULL
) {
671 /* We're shutting down; give up. */
675 switch (task
->tk_status
) {
679 case -NFS4ERR_BAD_STATEID
:
680 /* Race: client probably got cb_recall
681 * before open reply granting delegation */
684 /* Network partition? */
685 atomic_set(&clp
->cl_cb_set
, 0);
686 warn_no_callback_path(clp
, task
->tk_status
);
687 if (current_rpc_client
!= task
->tk_client
) {
688 /* queue a callback on the new connection: */
689 atomic_inc(&dp
->dl_count
);
694 if (dp
->dl_retries
--) {
695 rpc_delay(task
, 2*HZ
);
697 rpc_restart_call_prepare(task
);
700 atomic_set(&clp
->cl_cb_set
, 0);
701 warn_no_callback_path(clp
, task
->tk_status
);
705 static void nfsd4_cb_recall_release(void *calldata
)
707 struct nfs4_delegation
*dp
= calldata
;
709 nfs4_put_delegation(dp
);
712 static const struct rpc_call_ops nfsd4_cb_recall_ops
= {
713 .rpc_call_prepare
= nfsd4_cb_prepare
,
714 .rpc_call_done
= nfsd4_cb_recall_done
,
715 .rpc_release
= nfsd4_cb_recall_release
,
718 static struct workqueue_struct
*callback_wq
;
720 int nfsd4_create_callback_queue(void)
722 callback_wq
= create_singlethread_workqueue("nfsd4_callbacks");
728 void nfsd4_destroy_callback_queue(void)
730 destroy_workqueue(callback_wq
);
733 /* must be called under the state lock */
734 void nfsd4_set_callback_client(struct nfs4_client
*clp
, struct rpc_clnt
*new)
736 struct rpc_clnt
*old
= clp
->cl_cb_client
;
738 clp
->cl_cb_client
= new;
740 * After this, any work that saw the old value of cl_cb_client will
743 flush_workqueue(callback_wq
);
744 /* So we can safely shut it down: */
746 rpc_shutdown_client(old
);
750 * called with dp->dl_count inc'ed.
752 static void _nfsd4_cb_recall(struct nfs4_delegation
*dp
)
754 struct nfs4_client
*clp
= dp
->dl_client
;
755 struct rpc_clnt
*clnt
= clp
->cl_cb_client
;
756 struct nfs4_rpc_args
*args
= &dp
->dl_recall
.cb_args
;
757 struct rpc_message msg
= {
758 .rpc_proc
= &nfs4_cb_procedures
[NFSPROC4_CLNT_CB_RECALL
],
759 .rpc_cred
= callback_cred
763 nfs4_put_delegation(dp
);
764 return; /* Client is shutting down; give up. */
770 rpc_call_async(clnt
, &msg
, RPC_TASK_SOFT
, &nfsd4_cb_recall_ops
, dp
);
773 void nfsd4_do_callback_rpc(struct work_struct
*w
)
775 /* In future, generalize to handle any sort of callback. */
776 struct nfsd4_callback
*c
= container_of(w
, struct nfsd4_callback
, cb_work
);
777 struct nfs4_delegation
*dp
= container_of(c
, struct nfs4_delegation
, dl_recall
);
779 _nfsd4_cb_recall(dp
);
783 void nfsd4_cb_recall(struct nfs4_delegation
*dp
)
785 queue_work(callback_wq
, &dp
->dl_recall
.cb_work
);