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1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Copyright (c) 2001 The Regents of the University of Michigan. |
3 | * All rights reserved. | |
4 | * | |
5 | * Kendrick Smith <kmsmith@umich.edu> | |
6 | * Andy Adamson <andros@umich.edu> | |
7 | * | |
8 | * Redistribution and use in source and binary forms, with or without | |
9 | * modification, are permitted provided that the following conditions | |
10 | * are met: | |
11 | * | |
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. | |
20 | * | |
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. | |
32 | */ | |
33 | ||
1da177e4 | 34 | #include <linux/sunrpc/clnt.h> |
b5a1a81e | 35 | #include <linux/sunrpc/svc_xprt.h> |
5a0e3ad6 | 36 | #include <linux/slab.h> |
9a74af21 BH |
37 | #include "nfsd.h" |
38 | #include "state.h" | |
1da177e4 LT |
39 | |
40 | #define NFSDDBG_FACILITY NFSDDBG_PROC | |
41 | ||
42 | #define NFSPROC4_CB_NULL 0 | |
43 | #define NFSPROC4_CB_COMPOUND 1 | |
44 | ||
1da177e4 LT |
45 | /* Index of predefined Linux callback client operations */ |
46 | ||
47 | enum { | |
4be36ca0 | 48 | NFSPROC4_CLNT_CB_NULL = 0, |
1da177e4 | 49 | NFSPROC4_CLNT_CB_RECALL, |
38524ab3 | 50 | NFSPROC4_CLNT_CB_SEQUENCE, |
1da177e4 LT |
51 | }; |
52 | ||
1da177e4 LT |
53 | #define NFS4_MAXTAGLEN 20 |
54 | ||
55 | #define NFS4_enc_cb_null_sz 0 | |
56 | #define NFS4_dec_cb_null_sz 0 | |
57 | #define cb_compound_enc_hdr_sz 4 | |
58 | #define cb_compound_dec_hdr_sz (3 + (NFS4_MAXTAGLEN >> 2)) | |
38524ab3 AA |
59 | #define sessionid_sz (NFS4_MAX_SESSIONID_LEN >> 2) |
60 | #define cb_sequence_enc_sz (sessionid_sz + 4 + \ | |
61 | 1 /* no referring calls list yet */) | |
62 | #define cb_sequence_dec_sz (op_dec_sz + sessionid_sz + 4) | |
63 | ||
1da177e4 LT |
64 | #define op_enc_sz 1 |
65 | #define op_dec_sz 2 | |
66 | #define enc_nfs4_fh_sz (1 + (NFS4_FHSIZE >> 2)) | |
0ac68d17 | 67 | #define enc_stateid_sz (NFS4_STATEID_SIZE >> 2) |
1da177e4 | 68 | #define NFS4_enc_cb_recall_sz (cb_compound_enc_hdr_sz + \ |
38524ab3 | 69 | cb_sequence_enc_sz + \ |
1da177e4 LT |
70 | 1 + enc_stateid_sz + \ |
71 | enc_nfs4_fh_sz) | |
72 | ||
73 | #define NFS4_dec_cb_recall_sz (cb_compound_dec_hdr_sz + \ | |
38524ab3 | 74 | cb_sequence_dec_sz + \ |
1da177e4 LT |
75 | op_dec_sz) |
76 | ||
1da177e4 | 77 | struct nfs4_cb_compound_hdr { |
38524ab3 AA |
78 | /* args */ |
79 | u32 ident; /* minorversion 0 only */ | |
1da177e4 | 80 | u32 nops; |
ef52bff8 | 81 | __be32 *nops_p; |
ab52ae6d | 82 | u32 minorversion; |
38524ab3 AA |
83 | /* res */ |
84 | int status; | |
1da177e4 LT |
85 | }; |
86 | ||
85a56480 CL |
87 | /* |
88 | * Handle decode buffer overflows out-of-line. | |
89 | */ | |
90 | static void print_overflow_msg(const char *func, const struct xdr_stream *xdr) | |
1da177e4 | 91 | { |
85a56480 CL |
92 | dprintk("NFS: %s prematurely hit the end of our receive buffer. " |
93 | "Remaining buffer length is %tu words.\n", | |
94 | func, xdr->end - xdr->p); | |
1da177e4 LT |
95 | } |
96 | ||
a033db48 CL |
97 | static __be32 *xdr_encode_empty_array(__be32 *p) |
98 | { | |
99 | *p++ = xdr_zero; | |
100 | return p; | |
101 | } | |
102 | ||
103 | /* | |
104 | * Encode/decode NFSv4 CB basic data types | |
105 | * | |
106 | * Basic NFSv4 callback data types are defined in section 15 of RFC | |
107 | * 3530: "Network File System (NFS) version 4 Protocol" and section | |
108 | * 20 of RFC 5661: "Network File System (NFS) Version 4 Minor Version | |
109 | * 1 Protocol" | |
110 | */ | |
111 | ||
112 | /* | |
113 | * nfs_cb_opnum4 | |
114 | * | |
115 | * enum nfs_cb_opnum4 { | |
116 | * OP_CB_GETATTR = 3, | |
117 | * ... | |
118 | * }; | |
119 | */ | |
120 | enum nfs_cb_opnum4 { | |
121 | OP_CB_GETATTR = 3, | |
122 | OP_CB_RECALL = 4, | |
123 | OP_CB_LAYOUTRECALL = 5, | |
124 | OP_CB_NOTIFY = 6, | |
125 | OP_CB_PUSH_DELEG = 7, | |
126 | OP_CB_RECALL_ANY = 8, | |
127 | OP_CB_RECALLABLE_OBJ_AVAIL = 9, | |
128 | OP_CB_RECALL_SLOT = 10, | |
129 | OP_CB_SEQUENCE = 11, | |
130 | OP_CB_WANTS_CANCELLED = 12, | |
131 | OP_CB_NOTIFY_LOCK = 13, | |
132 | OP_CB_NOTIFY_DEVICEID = 14, | |
133 | OP_CB_ILLEGAL = 10044 | |
134 | }; | |
135 | ||
136 | static void encode_nfs_cb_opnum4(struct xdr_stream *xdr, enum nfs_cb_opnum4 op) | |
137 | { | |
138 | __be32 *p; | |
139 | ||
140 | p = xdr_reserve_space(xdr, 4); | |
141 | *p = cpu_to_be32(op); | |
142 | } | |
143 | ||
144 | /* | |
145 | * nfs_fh4 | |
146 | * | |
147 | * typedef opaque nfs_fh4<NFS4_FHSIZE>; | |
148 | */ | |
149 | static void encode_nfs_fh4(struct xdr_stream *xdr, const struct knfsd_fh *fh) | |
150 | { | |
151 | u32 length = fh->fh_size; | |
152 | __be32 *p; | |
153 | ||
154 | BUG_ON(length > NFS4_FHSIZE); | |
155 | p = xdr_reserve_space(xdr, 4 + length); | |
156 | xdr_encode_opaque(p, &fh->fh_base, length); | |
157 | } | |
158 | ||
1da177e4 | 159 | /* |
a033db48 CL |
160 | * stateid4 |
161 | * | |
162 | * struct stateid4 { | |
163 | * uint32_t seqid; | |
164 | * opaque other[12]; | |
165 | * }; | |
1da177e4 | 166 | */ |
a033db48 CL |
167 | static void encode_stateid4(struct xdr_stream *xdr, const stateid_t *sid) |
168 | { | |
169 | __be32 *p; | |
1da177e4 | 170 | |
a033db48 CL |
171 | p = xdr_reserve_space(xdr, NFS4_STATEID_SIZE); |
172 | *p++ = cpu_to_be32(sid->si_generation); | |
173 | xdr_encode_opaque_fixed(p, &sid->si_opaque, NFS4_STATEID_OTHER_SIZE); | |
174 | } | |
175 | ||
176 | /* | |
177 | * sessionid4 | |
178 | * | |
179 | * typedef opaque sessionid4[NFS4_SESSIONID_SIZE]; | |
180 | */ | |
181 | static void encode_sessionid4(struct xdr_stream *xdr, | |
182 | const struct nfsd4_session *session) | |
9303bbd3 BH |
183 | { |
184 | __be32 *p; | |
185 | ||
a033db48 CL |
186 | p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN); |
187 | xdr_encode_opaque_fixed(p, session->se_sessionid.data, | |
188 | NFS4_MAX_SESSIONID_LEN); | |
9303bbd3 BH |
189 | } |
190 | ||
85a56480 CL |
191 | /* |
192 | * nfsstat4 | |
193 | */ | |
194 | static const struct { | |
195 | int stat; | |
196 | int errno; | |
197 | } nfs_cb_errtbl[] = { | |
198 | { NFS4_OK, 0 }, | |
199 | { NFS4ERR_PERM, -EPERM }, | |
200 | { NFS4ERR_NOENT, -ENOENT }, | |
201 | { NFS4ERR_IO, -EIO }, | |
202 | { NFS4ERR_NXIO, -ENXIO }, | |
203 | { NFS4ERR_ACCESS, -EACCES }, | |
204 | { NFS4ERR_EXIST, -EEXIST }, | |
205 | { NFS4ERR_XDEV, -EXDEV }, | |
206 | { NFS4ERR_NOTDIR, -ENOTDIR }, | |
207 | { NFS4ERR_ISDIR, -EISDIR }, | |
208 | { NFS4ERR_INVAL, -EINVAL }, | |
209 | { NFS4ERR_FBIG, -EFBIG }, | |
210 | { NFS4ERR_NOSPC, -ENOSPC }, | |
211 | { NFS4ERR_ROFS, -EROFS }, | |
212 | { NFS4ERR_MLINK, -EMLINK }, | |
213 | { NFS4ERR_NAMETOOLONG, -ENAMETOOLONG }, | |
214 | { NFS4ERR_NOTEMPTY, -ENOTEMPTY }, | |
215 | { NFS4ERR_DQUOT, -EDQUOT }, | |
216 | { NFS4ERR_STALE, -ESTALE }, | |
217 | { NFS4ERR_BADHANDLE, -EBADHANDLE }, | |
218 | { NFS4ERR_BAD_COOKIE, -EBADCOOKIE }, | |
219 | { NFS4ERR_NOTSUPP, -ENOTSUPP }, | |
220 | { NFS4ERR_TOOSMALL, -ETOOSMALL }, | |
221 | { NFS4ERR_SERVERFAULT, -ESERVERFAULT }, | |
222 | { NFS4ERR_BADTYPE, -EBADTYPE }, | |
223 | { NFS4ERR_LOCKED, -EAGAIN }, | |
224 | { NFS4ERR_RESOURCE, -EREMOTEIO }, | |
225 | { NFS4ERR_SYMLINK, -ELOOP }, | |
226 | { NFS4ERR_OP_ILLEGAL, -EOPNOTSUPP }, | |
227 | { NFS4ERR_DEADLOCK, -EDEADLK }, | |
228 | { -1, -EIO } | |
229 | }; | |
230 | ||
231 | /* | |
232 | * If we cannot translate the error, the recovery routines should | |
233 | * handle it. | |
234 | * | |
235 | * Note: remaining NFSv4 error codes have values > 10000, so should | |
236 | * not conflict with native Linux error codes. | |
237 | */ | |
238 | static int nfs_cb_stat_to_errno(int status) | |
239 | { | |
240 | int i; | |
241 | ||
242 | for (i = 0; nfs_cb_errtbl[i].stat != -1; i++) { | |
243 | if (nfs_cb_errtbl[i].stat == status) | |
244 | return nfs_cb_errtbl[i].errno; | |
245 | } | |
246 | ||
247 | dprintk("NFSD: Unrecognized NFS CB status value: %u\n", status); | |
248 | return -status; | |
249 | } | |
250 | ||
251 | static int decode_cb_op_status(struct xdr_stream *xdr, enum nfs_opnum4 expected, | |
252 | enum nfsstat4 *status) | |
253 | { | |
254 | __be32 *p; | |
255 | u32 op; | |
256 | ||
257 | p = xdr_inline_decode(xdr, 4 + 4); | |
258 | if (unlikely(p == NULL)) | |
259 | goto out_overflow; | |
260 | op = be32_to_cpup(p++); | |
261 | if (unlikely(op != expected)) | |
262 | goto out_unexpected; | |
263 | *status = be32_to_cpup(p); | |
264 | return 0; | |
265 | out_overflow: | |
266 | print_overflow_msg(__func__, xdr); | |
267 | return -EIO; | |
268 | out_unexpected: | |
269 | dprintk("NFSD: Callback server returned operation %d but " | |
270 | "we issued a request for %d\n", op, expected); | |
271 | return -EIO; | |
272 | } | |
273 | ||
a033db48 CL |
274 | /* |
275 | * CB_COMPOUND4args | |
276 | * | |
277 | * struct CB_COMPOUND4args { | |
278 | * utf8str_cs tag; | |
279 | * uint32_t minorversion; | |
280 | * uint32_t callback_ident; | |
281 | * nfs_cb_argop4 argarray<>; | |
282 | * }; | |
283 | */ | |
284 | static void encode_cb_compound4args(struct xdr_stream *xdr, | |
285 | struct nfs4_cb_compound_hdr *hdr) | |
1da177e4 | 286 | { |
f00f328f | 287 | __be32 * p; |
1da177e4 | 288 | |
a033db48 CL |
289 | p = xdr_reserve_space(xdr, 4 + 4 + 4 + 4); |
290 | p = xdr_encode_empty_array(p); /* empty tag */ | |
291 | *p++ = cpu_to_be32(hdr->minorversion); | |
292 | *p++ = cpu_to_be32(hdr->ident); | |
293 | ||
ef52bff8 | 294 | hdr->nops_p = p; |
a033db48 | 295 | *p = cpu_to_be32(hdr->nops); /* argarray element count */ |
1da177e4 LT |
296 | } |
297 | ||
a033db48 CL |
298 | /* |
299 | * Update argarray element count | |
300 | */ | |
ef52bff8 AA |
301 | static void encode_cb_nops(struct nfs4_cb_compound_hdr *hdr) |
302 | { | |
a033db48 CL |
303 | BUG_ON(hdr->nops > NFS4_MAX_BACK_CHANNEL_OPS); |
304 | *hdr->nops_p = cpu_to_be32(hdr->nops); | |
ef52bff8 AA |
305 | } |
306 | ||
85a56480 CL |
307 | /* |
308 | * CB_COMPOUND4res | |
309 | * | |
310 | * struct CB_COMPOUND4res { | |
311 | * nfsstat4 status; | |
312 | * utf8str_cs tag; | |
313 | * nfs_cb_resop4 resarray<>; | |
314 | * }; | |
315 | */ | |
316 | static int decode_cb_compound4res(struct xdr_stream *xdr, | |
317 | struct nfs4_cb_compound_hdr *hdr) | |
318 | { | |
319 | u32 length; | |
320 | __be32 *p; | |
321 | ||
322 | p = xdr_inline_decode(xdr, 4 + 4); | |
323 | if (unlikely(p == NULL)) | |
324 | goto out_overflow; | |
325 | hdr->status = be32_to_cpup(p++); | |
326 | /* Ignore the tag */ | |
327 | length = be32_to_cpup(p++); | |
328 | p = xdr_inline_decode(xdr, length + 4); | |
329 | if (unlikely(p == NULL)) | |
330 | goto out_overflow; | |
331 | hdr->nops = be32_to_cpup(p); | |
332 | return 0; | |
333 | out_overflow: | |
334 | print_overflow_msg(__func__, xdr); | |
335 | return -EIO; | |
336 | } | |
337 | ||
a033db48 CL |
338 | /* |
339 | * CB_RECALL4args | |
340 | * | |
341 | * struct CB_RECALL4args { | |
342 | * stateid4 stateid; | |
343 | * bool truncate; | |
344 | * nfs_fh4 fh; | |
345 | * }; | |
346 | */ | |
347 | static void encode_cb_recall4args(struct xdr_stream *xdr, | |
348 | const struct nfs4_delegation *dp, | |
349 | struct nfs4_cb_compound_hdr *hdr) | |
1da177e4 | 350 | { |
f00f328f | 351 | __be32 *p; |
a033db48 CL |
352 | |
353 | encode_nfs_cb_opnum4(xdr, OP_CB_RECALL); | |
354 | encode_stateid4(xdr, &dp->dl_stateid); | |
355 | ||
356 | p = xdr_reserve_space(xdr, 4); | |
357 | *p++ = xdr_zero; /* truncate */ | |
358 | ||
359 | encode_nfs_fh4(xdr, &dp->dl_fh); | |
360 | ||
ef52bff8 | 361 | hdr->nops++; |
1da177e4 LT |
362 | } |
363 | ||
a033db48 CL |
364 | /* |
365 | * CB_SEQUENCE4args | |
366 | * | |
367 | * struct CB_SEQUENCE4args { | |
368 | * sessionid4 csa_sessionid; | |
369 | * sequenceid4 csa_sequenceid; | |
370 | * slotid4 csa_slotid; | |
371 | * slotid4 csa_highest_slotid; | |
372 | * bool csa_cachethis; | |
373 | * referring_call_list4 csa_referring_call_lists<>; | |
374 | * }; | |
375 | */ | |
376 | static void encode_cb_sequence4args(struct xdr_stream *xdr, | |
377 | const struct nfsd4_callback *cb, | |
378 | struct nfs4_cb_compound_hdr *hdr) | |
2af73580 | 379 | { |
a033db48 | 380 | struct nfsd4_session *session = cb->cb_clp->cl_cb_session; |
2af73580 BH |
381 | __be32 *p; |
382 | ||
383 | if (hdr->minorversion == 0) | |
384 | return; | |
385 | ||
a033db48 CL |
386 | encode_nfs_cb_opnum4(xdr, OP_CB_SEQUENCE); |
387 | encode_sessionid4(xdr, session); | |
388 | ||
389 | p = xdr_reserve_space(xdr, 4 + 4 + 4 + 4 + 4); | |
390 | *p++ = cpu_to_be32(session->se_cb_seq_nr); /* csa_sequenceid */ | |
391 | *p++ = xdr_zero; /* csa_slotid */ | |
392 | *p++ = xdr_zero; /* csa_highest_slotid */ | |
393 | *p++ = xdr_zero; /* csa_cachethis */ | |
394 | xdr_encode_empty_array(p); /* csa_referring_call_lists */ | |
2af73580 | 395 | |
2af73580 BH |
396 | hdr->nops++; |
397 | } | |
398 | ||
85a56480 CL |
399 | /* |
400 | * CB_SEQUENCE4resok | |
401 | * | |
402 | * struct CB_SEQUENCE4resok { | |
403 | * sessionid4 csr_sessionid; | |
404 | * sequenceid4 csr_sequenceid; | |
405 | * slotid4 csr_slotid; | |
406 | * slotid4 csr_highest_slotid; | |
407 | * slotid4 csr_target_highest_slotid; | |
408 | * }; | |
409 | * | |
410 | * union CB_SEQUENCE4res switch (nfsstat4 csr_status) { | |
411 | * case NFS4_OK: | |
412 | * CB_SEQUENCE4resok csr_resok4; | |
413 | * default: | |
414 | * void; | |
415 | * }; | |
416 | * | |
417 | * Our current back channel implmentation supports a single backchannel | |
418 | * with a single slot. | |
419 | */ | |
420 | static int decode_cb_sequence4resok(struct xdr_stream *xdr, | |
421 | struct nfsd4_callback *cb) | |
422 | { | |
423 | struct nfsd4_session *session = cb->cb_clp->cl_cb_session; | |
424 | struct nfs4_sessionid id; | |
425 | int status; | |
426 | __be32 *p; | |
427 | u32 dummy; | |
428 | ||
429 | status = -ESERVERFAULT; | |
430 | ||
431 | /* | |
432 | * If the server returns different values for sessionID, slotID or | |
433 | * sequence number, the server is looney tunes. | |
434 | */ | |
435 | p = xdr_inline_decode(xdr, NFS4_MAX_SESSIONID_LEN + 4 + 4); | |
436 | if (unlikely(p == NULL)) | |
437 | goto out_overflow; | |
438 | memcpy(id.data, p, NFS4_MAX_SESSIONID_LEN); | |
439 | if (memcmp(id.data, session->se_sessionid.data, | |
440 | NFS4_MAX_SESSIONID_LEN) != 0) { | |
441 | dprintk("NFS: %s Invalid session id\n", __func__); | |
442 | goto out; | |
443 | } | |
444 | p += XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN); | |
445 | ||
446 | dummy = be32_to_cpup(p++); | |
447 | if (dummy != session->se_cb_seq_nr) { | |
448 | dprintk("NFS: %s Invalid sequence number\n", __func__); | |
449 | goto out; | |
450 | } | |
451 | ||
452 | dummy = be32_to_cpup(p++); | |
453 | if (dummy != 0) { | |
454 | dprintk("NFS: %s Invalid slotid\n", __func__); | |
455 | goto out; | |
456 | } | |
457 | ||
458 | /* | |
459 | * FIXME: process highest slotid and target highest slotid | |
460 | */ | |
461 | status = 0; | |
462 | out: | |
463 | return status; | |
464 | out_overflow: | |
465 | print_overflow_msg(__func__, xdr); | |
466 | return -EIO; | |
467 | } | |
468 | ||
469 | static int decode_cb_sequence4res(struct xdr_stream *xdr, | |
470 | struct nfsd4_callback *cb) | |
471 | { | |
472 | enum nfsstat4 nfserr; | |
473 | int status; | |
474 | ||
475 | if (cb->cb_minorversion == 0) | |
476 | return 0; | |
477 | ||
478 | status = decode_cb_op_status(xdr, OP_CB_SEQUENCE, &nfserr); | |
479 | if (unlikely(status)) | |
480 | goto out; | |
481 | if (unlikely(nfserr != NFS4_OK)) | |
482 | goto out_default; | |
483 | status = decode_cb_sequence4resok(xdr, cb); | |
484 | out: | |
485 | return status; | |
486 | out_default: | |
487 | return nfs_cb_stat_to_errno(status); | |
488 | } | |
489 | ||
a033db48 CL |
490 | /* |
491 | * NFSv4.0 and NFSv4.1 XDR encode functions | |
492 | * | |
493 | * NFSv4.0 callback argument types are defined in section 15 of RFC | |
494 | * 3530: "Network File System (NFS) version 4 Protocol" and section 20 | |
495 | * of RFC 5661: "Network File System (NFS) Version 4 Minor Version 1 | |
496 | * Protocol". | |
497 | */ | |
498 | ||
499 | /* | |
500 | * NB: Without this zero space reservation, callbacks over krb5p fail | |
501 | */ | |
502 | static int nfs4_xdr_enc_cb_null(struct rpc_rqst *req, __be32 *p, void *__unused) | |
1da177e4 LT |
503 | { |
504 | struct xdr_stream xdrs, *xdr = &xdrs; | |
505 | ||
506 | xdr_init_encode(&xdrs, &req->rq_snd_buf, p); | |
a033db48 | 507 | xdr_reserve_space(xdr, 0); |
1da177e4 LT |
508 | return 0; |
509 | } | |
510 | ||
a033db48 CL |
511 | /* |
512 | * 20.2. Operation 4: CB_RECALL - Recall a Delegation | |
513 | */ | |
514 | static int nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, __be32 *p, | |
515 | const struct nfsd4_callback *cb) | |
1da177e4 LT |
516 | { |
517 | struct xdr_stream xdr; | |
a033db48 | 518 | const struct nfs4_delegation *args = cb->cb_op; |
1da177e4 | 519 | struct nfs4_cb_compound_hdr hdr = { |
6ff8da08 | 520 | .ident = cb->cb_clp->cl_cb_ident, |
fb003923 | 521 | .minorversion = cb->cb_minorversion, |
1da177e4 LT |
522 | }; |
523 | ||
524 | xdr_init_encode(&xdr, &req->rq_snd_buf, p); | |
a033db48 CL |
525 | encode_cb_compound4args(&xdr, &hdr); |
526 | encode_cb_sequence4args(&xdr, cb, &hdr); | |
527 | encode_cb_recall4args(&xdr, args, &hdr); | |
ef52bff8 AA |
528 | encode_cb_nops(&hdr); |
529 | return 0; | |
1da177e4 LT |
530 | } |
531 | ||
532 | ||
2af73580 | 533 | /* |
85a56480 CL |
534 | * NFSv4.0 and NFSv4.1 XDR decode functions |
535 | * | |
536 | * NFSv4.0 callback result types are defined in section 15 of RFC | |
537 | * 3530: "Network File System (NFS) version 4 Protocol" and section 20 | |
538 | * of RFC 5661: "Network File System (NFS) Version 4 Minor Version 1 | |
539 | * Protocol". | |
2af73580 | 540 | */ |
2af73580 | 541 | |
85a56480 | 542 | static int nfs4_xdr_dec_cb_null(struct rpc_rqst *req, __be32 *p, void *__unused) |
1da177e4 LT |
543 | { |
544 | return 0; | |
545 | } | |
546 | ||
85a56480 CL |
547 | /* |
548 | * 20.2. Operation 4: CB_RECALL - Recall a Delegation | |
549 | */ | |
550 | static int nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp, __be32 *p, | |
551 | struct nfsd4_callback *cb) | |
1da177e4 LT |
552 | { |
553 | struct xdr_stream xdr; | |
554 | struct nfs4_cb_compound_hdr hdr; | |
85a56480 | 555 | enum nfsstat4 nfserr; |
1da177e4 LT |
556 | int status; |
557 | ||
558 | xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p); | |
85a56480 CL |
559 | status = decode_cb_compound4res(&xdr, &hdr); |
560 | if (unlikely(status)) | |
1da177e4 | 561 | goto out; |
85a56480 CL |
562 | |
563 | if (cb != NULL) { | |
564 | status = decode_cb_sequence4res(&xdr, cb); | |
565 | if (unlikely(status)) | |
0421b5c5 RL |
566 | goto out; |
567 | } | |
85a56480 CL |
568 | |
569 | status = decode_cb_op_status(&xdr, OP_CB_RECALL, &nfserr); | |
570 | if (unlikely(status)) | |
571 | goto out; | |
572 | if (unlikely(nfserr != NFS4_OK)) | |
573 | goto out_default; | |
1da177e4 LT |
574 | out: |
575 | return status; | |
85a56480 CL |
576 | out_default: |
577 | return nfs_cb_stat_to_errno(status); | |
1da177e4 LT |
578 | } |
579 | ||
580 | /* | |
581 | * RPC procedure tables | |
582 | */ | |
1da177e4 LT |
583 | #define PROC(proc, call, argtype, restype) \ |
584 | [NFSPROC4_CLNT_##proc] = { \ | |
585 | .p_proc = NFSPROC4_CB_##call, \ | |
586 | .p_encode = (kxdrproc_t) nfs4_xdr_##argtype, \ | |
587 | .p_decode = (kxdrproc_t) nfs4_xdr_##restype, \ | |
2bea90d4 CL |
588 | .p_arglen = NFS4_##argtype##_sz, \ |
589 | .p_replen = NFS4_##restype##_sz, \ | |
cc0175c1 CL |
590 | .p_statidx = NFSPROC4_CB_##call, \ |
591 | .p_name = #proc, \ | |
1da177e4 LT |
592 | } |
593 | ||
fd39ca9a | 594 | static struct rpc_procinfo nfs4_cb_procedures[] = { |
1da177e4 LT |
595 | PROC(CB_NULL, NULL, enc_cb_null, dec_cb_null), |
596 | PROC(CB_RECALL, COMPOUND, enc_cb_recall, dec_cb_recall), | |
597 | }; | |
598 | ||
fd39ca9a | 599 | static struct rpc_version nfs_cb_version4 = { |
b7299f44 BF |
600 | /* |
601 | * Note on the callback rpc program version number: despite language in rfc | |
602 | * 5661 section 18.36.3 requiring servers to use 4 in this field, the | |
603 | * official xdr descriptions for both 4.0 and 4.1 specify version 1, and | |
604 | * in practice that appears to be what implementations use. The section | |
605 | * 18.36.3 language is expected to be fixed in an erratum. | |
606 | */ | |
1da177e4 | 607 | .number = 1, |
e8c96f8c | 608 | .nrprocs = ARRAY_SIZE(nfs4_cb_procedures), |
1da177e4 LT |
609 | .procs = nfs4_cb_procedures |
610 | }; | |
611 | ||
612 | static struct rpc_version * nfs_cb_version[] = { | |
1da177e4 LT |
613 | &nfs_cb_version4, |
614 | }; | |
615 | ||
ff7d9756 OK |
616 | static struct rpc_program cb_program; |
617 | ||
618 | static struct rpc_stat cb_stats = { | |
619 | .program = &cb_program | |
620 | }; | |
621 | ||
622 | #define NFS4_CALLBACK 0x40000000 | |
623 | static struct rpc_program cb_program = { | |
624 | .name = "nfs4_cb", | |
625 | .number = NFS4_CALLBACK, | |
626 | .nrvers = ARRAY_SIZE(nfs_cb_version), | |
627 | .version = nfs_cb_version, | |
628 | .stats = &cb_stats, | |
61054b14 | 629 | .pipe_dir_name = "/nfsd4_cb", |
ff7d9756 OK |
630 | }; |
631 | ||
595947ac BF |
632 | static int max_cb_time(void) |
633 | { | |
cf07d2ea | 634 | return max(nfsd4_lease/10, (time_t)1) * HZ; |
595947ac BF |
635 | } |
636 | ||
2b47eece | 637 | /* Reference counting, callback cleanup, etc., all look racy as heck. |
2bf23875 | 638 | * And why is cl_cb_set an atomic? */ |
2b47eece | 639 | |
07263f1e | 640 | int setup_callback_client(struct nfs4_client *clp, struct nfs4_cb_conn *conn) |
2b47eece | 641 | { |
ae5c7947 | 642 | struct rpc_timeout timeparms = { |
595947ac BF |
643 | .to_initval = max_cb_time(), |
644 | .to_retries = 0, | |
ae5c7947 | 645 | }; |
ae5c7947 | 646 | struct rpc_create_args args = { |
c653ce3f | 647 | .net = &init_net, |
07263f1e BF |
648 | .address = (struct sockaddr *) &conn->cb_addr, |
649 | .addrsize = conn->cb_addrlen, | |
ae5c7947 | 650 | .timeout = &timeparms, |
ff7d9756 | 651 | .program = &cb_program, |
b7299f44 | 652 | .version = 0, |
61054b14 | 653 | .authflavor = clp->cl_flavor, |
b6b6152c | 654 | .flags = (RPC_CLNT_CREATE_NOPING | RPC_CLNT_CREATE_QUIET), |
ae5c7947 | 655 | }; |
63c86716 | 656 | struct rpc_clnt *client; |
1da177e4 | 657 | |
5d18c1c2 BF |
658 | if (clp->cl_minorversion == 0) { |
659 | if (!clp->cl_principal && (clp->cl_flavor >= RPC_AUTH_GSS_KRB5)) | |
660 | return -EINVAL; | |
661 | args.client_name = clp->cl_principal; | |
662 | args.prognumber = conn->cb_prog, | |
663 | args.protocol = XPRT_TRANSPORT_TCP; | |
664 | clp->cl_cb_ident = conn->cb_ident; | |
665 | } else { | |
07263f1e | 666 | args.bc_xprt = conn->cb_xprt; |
8b5ce5cd | 667 | args.prognumber = clp->cl_cb_session->se_cb_prog; |
3ddc8bf5 AB |
668 | args.protocol = XPRT_TRANSPORT_BC_TCP; |
669 | } | |
ae5c7947 | 670 | /* Create RPC client */ |
63c86716 | 671 | client = rpc_create(&args); |
e1cab5a5 | 672 | if (IS_ERR(client)) { |
a601caed BF |
673 | dprintk("NFSD: couldn't create callback client: %ld\n", |
674 | PTR_ERR(client)); | |
e1cab5a5 BF |
675 | return PTR_ERR(client); |
676 | } | |
6ff8da08 | 677 | clp->cl_cb_client = client; |
e1cab5a5 | 678 | return 0; |
a601caed BF |
679 | |
680 | } | |
681 | ||
ecdd03b7 BF |
682 | static void warn_no_callback_path(struct nfs4_client *clp, int reason) |
683 | { | |
684 | dprintk("NFSD: warning: no callback path to client %.*s: error %d\n", | |
685 | (int)clp->cl_name.len, clp->cl_name.data, reason); | |
686 | } | |
687 | ||
e300a63c BF |
688 | static void nfsd4_cb_probe_done(struct rpc_task *task, void *calldata) |
689 | { | |
cee277d9 | 690 | struct nfs4_client *clp = container_of(calldata, struct nfs4_client, cl_cb_null); |
e300a63c BF |
691 | |
692 | if (task->tk_status) | |
693 | warn_no_callback_path(clp, task->tk_status); | |
694 | else | |
2bf23875 | 695 | atomic_set(&clp->cl_cb_set, 1); |
e300a63c BF |
696 | } |
697 | ||
698 | static const struct rpc_call_ops nfsd4_cb_probe_ops = { | |
cee277d9 BF |
699 | /* XXX: release method to ensure we set the cb channel down if |
700 | * necessary on early failure? */ | |
e300a63c BF |
701 | .rpc_call_done = nfsd4_cb_probe_done, |
702 | }; | |
703 | ||
80fc015b BF |
704 | static struct rpc_cred *callback_cred; |
705 | ||
706 | int set_callback_cred(void) | |
3cef9ab2 | 707 | { |
8d75da8a BF |
708 | if (callback_cred) |
709 | return 0; | |
80fc015b BF |
710 | callback_cred = rpc_lookup_machine_cred(); |
711 | if (!callback_cred) | |
712 | return -ENOMEM; | |
713 | return 0; | |
3cef9ab2 BF |
714 | } |
715 | ||
cee277d9 | 716 | static struct workqueue_struct *callback_wq; |
80fc015b | 717 | |
5a3c9d71 | 718 | static void do_probe_callback(struct nfs4_client *clp) |
a601caed | 719 | { |
cee277d9 | 720 | struct nfsd4_callback *cb = &clp->cl_cb_null; |
a601caed | 721 | |
fb003923 BF |
722 | cb->cb_op = NULL; |
723 | cb->cb_clp = clp; | |
cee277d9 BF |
724 | |
725 | cb->cb_msg.rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_NULL]; | |
726 | cb->cb_msg.rpc_argp = NULL; | |
727 | cb->cb_msg.rpc_resp = NULL; | |
728 | cb->cb_msg.rpc_cred = callback_cred; | |
729 | ||
730 | cb->cb_ops = &nfsd4_cb_probe_ops; | |
731 | ||
732 | queue_work(callback_wq, &cb->cb_work); | |
63c86716 BF |
733 | } |
734 | ||
735 | /* | |
5a3c9d71 BF |
736 | * Poke the callback thread to process any updates to the callback |
737 | * parameters, and send a null probe. | |
63c86716 | 738 | */ |
5a3c9d71 BF |
739 | void nfsd4_probe_callback(struct nfs4_client *clp) |
740 | { | |
741 | set_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_cb_flags); | |
742 | do_probe_callback(clp); | |
743 | } | |
744 | ||
745 | void nfsd4_change_callback(struct nfs4_client *clp, struct nfs4_cb_conn *conn) | |
63c86716 | 746 | { |
2bf23875 | 747 | BUG_ON(atomic_read(&clp->cl_cb_set)); |
63c86716 | 748 | |
6ff8da08 BF |
749 | spin_lock(&clp->cl_lock); |
750 | memcpy(&clp->cl_cb_conn, conn, sizeof(struct nfs4_cb_conn)); | |
6ff8da08 | 751 | spin_unlock(&clp->cl_lock); |
1da177e4 LT |
752 | } |
753 | ||
2a1d1b59 RL |
754 | /* |
755 | * There's currently a single callback channel slot. | |
756 | * If the slot is available, then mark it busy. Otherwise, set the | |
757 | * thread for sleeping on the callback RPC wait queue. | |
758 | */ | |
759 | static int nfsd41_cb_setup_sequence(struct nfs4_client *clp, | |
760 | struct rpc_task *task) | |
761 | { | |
90c8145b | 762 | u32 *ptr = (u32 *)clp->cl_cb_session->se_sessionid.data; |
2a1d1b59 RL |
763 | int status = 0; |
764 | ||
765 | dprintk("%s: %u:%u:%u:%u\n", __func__, | |
766 | ptr[0], ptr[1], ptr[2], ptr[3]); | |
767 | ||
768 | if (test_and_set_bit(0, &clp->cl_cb_slot_busy) != 0) { | |
769 | rpc_sleep_on(&clp->cl_cb_waitq, task, NULL); | |
770 | dprintk("%s slot is busy\n", __func__); | |
771 | status = -EAGAIN; | |
772 | goto out; | |
773 | } | |
2a1d1b59 RL |
774 | out: |
775 | dprintk("%s status=%d\n", __func__, status); | |
776 | return status; | |
777 | } | |
778 | ||
779 | /* | |
780 | * TODO: cb_sequence should support referring call lists, cachethis, multiple | |
781 | * slots, and mark callback channel down on communication errors. | |
782 | */ | |
783 | static void nfsd4_cb_prepare(struct rpc_task *task, void *calldata) | |
784 | { | |
5878453d BF |
785 | struct nfsd4_callback *cb = calldata; |
786 | struct nfs4_delegation *dp = container_of(cb, struct nfs4_delegation, dl_recall); | |
2a1d1b59 | 787 | struct nfs4_client *clp = dp->dl_client; |
8323c3b2 | 788 | u32 minorversion = clp->cl_minorversion; |
2a1d1b59 RL |
789 | int status = 0; |
790 | ||
fb003923 | 791 | cb->cb_minorversion = minorversion; |
2a1d1b59 RL |
792 | if (minorversion) { |
793 | status = nfsd41_cb_setup_sequence(clp, task); | |
794 | if (status) { | |
795 | if (status != -EAGAIN) { | |
796 | /* terminate rpc task */ | |
797 | task->tk_status = status; | |
798 | task->tk_action = NULL; | |
799 | } | |
800 | return; | |
801 | } | |
802 | } | |
803 | rpc_call_start(task); | |
804 | } | |
805 | ||
0421b5c5 RL |
806 | static void nfsd4_cb_done(struct rpc_task *task, void *calldata) |
807 | { | |
5878453d BF |
808 | struct nfsd4_callback *cb = calldata; |
809 | struct nfs4_delegation *dp = container_of(cb, struct nfs4_delegation, dl_recall); | |
0421b5c5 RL |
810 | struct nfs4_client *clp = dp->dl_client; |
811 | ||
812 | dprintk("%s: minorversion=%d\n", __func__, | |
8323c3b2 | 813 | clp->cl_minorversion); |
0421b5c5 | 814 | |
8323c3b2 | 815 | if (clp->cl_minorversion) { |
0421b5c5 | 816 | /* No need for lock, access serialized in nfsd4_cb_prepare */ |
ac7c46f2 | 817 | ++clp->cl_cb_session->se_cb_seq_nr; |
0421b5c5 RL |
818 | clear_bit(0, &clp->cl_cb_slot_busy); |
819 | rpc_wake_up_next(&clp->cl_cb_waitq); | |
820 | dprintk("%s: freed slot, new seqid=%d\n", __func__, | |
ac7c46f2 | 821 | clp->cl_cb_session->se_cb_seq_nr); |
0421b5c5 RL |
822 | |
823 | /* We're done looking into the sequence information */ | |
824 | task->tk_msg.rpc_resp = NULL; | |
825 | } | |
826 | } | |
827 | ||
4b21d0de | 828 | |
63e4863f BF |
829 | static void nfsd4_cb_recall_done(struct rpc_task *task, void *calldata) |
830 | { | |
5878453d BF |
831 | struct nfsd4_callback *cb = calldata; |
832 | struct nfs4_delegation *dp = container_of(cb, struct nfs4_delegation, dl_recall); | |
63e4863f | 833 | struct nfs4_client *clp = dp->dl_client; |
4b21d0de | 834 | struct rpc_clnt *current_rpc_client = clp->cl_cb_client; |
63e4863f | 835 | |
0421b5c5 RL |
836 | nfsd4_cb_done(task, calldata); |
837 | ||
4b21d0de BF |
838 | if (current_rpc_client == NULL) { |
839 | /* We're shutting down; give up. */ | |
840 | /* XXX: err, or is it ok just to fall through | |
841 | * and rpc_restart_call? */ | |
842 | return; | |
843 | } | |
844 | ||
63e4863f | 845 | switch (task->tk_status) { |
172c85dd BF |
846 | case 0: |
847 | return; | |
848 | case -EBADHANDLE: | |
849 | case -NFS4ERR_BAD_STATEID: | |
850 | /* Race: client probably got cb_recall | |
851 | * before open reply granting delegation */ | |
852 | break; | |
853 | default: | |
63e4863f | 854 | /* Network partition? */ |
2bf23875 | 855 | atomic_set(&clp->cl_cb_set, 0); |
63e4863f | 856 | warn_no_callback_path(clp, task->tk_status); |
4b21d0de BF |
857 | if (current_rpc_client != task->tk_client) { |
858 | /* queue a callback on the new connection: */ | |
cba9ba4b | 859 | atomic_inc(&dp->dl_count); |
4b21d0de BF |
860 | nfsd4_cb_recall(dp); |
861 | return; | |
862 | } | |
63e4863f BF |
863 | } |
864 | if (dp->dl_retries--) { | |
865 | rpc_delay(task, 2*HZ); | |
866 | task->tk_status = 0; | |
c18c821f | 867 | rpc_restart_call_prepare(task); |
0421b5c5 | 868 | return; |
63e4863f | 869 | } else { |
2bf23875 | 870 | atomic_set(&clp->cl_cb_set, 0); |
63e4863f BF |
871 | warn_no_callback_path(clp, task->tk_status); |
872 | } | |
873 | } | |
874 | ||
875 | static void nfsd4_cb_recall_release(void *calldata) | |
876 | { | |
5878453d BF |
877 | struct nfsd4_callback *cb = calldata; |
878 | struct nfs4_delegation *dp = container_of(cb, struct nfs4_delegation, dl_recall); | |
63e4863f BF |
879 | |
880 | nfs4_put_delegation(dp); | |
63e4863f BF |
881 | } |
882 | ||
883 | static const struct rpc_call_ops nfsd4_cb_recall_ops = { | |
2a1d1b59 | 884 | .rpc_call_prepare = nfsd4_cb_prepare, |
63e4863f BF |
885 | .rpc_call_done = nfsd4_cb_recall_done, |
886 | .rpc_release = nfsd4_cb_recall_release, | |
887 | }; | |
888 | ||
b5a1a81e BF |
889 | int nfsd4_create_callback_queue(void) |
890 | { | |
891 | callback_wq = create_singlethread_workqueue("nfsd4_callbacks"); | |
892 | if (!callback_wq) | |
893 | return -ENOMEM; | |
894 | return 0; | |
895 | } | |
896 | ||
897 | void nfsd4_destroy_callback_queue(void) | |
898 | { | |
899 | destroy_workqueue(callback_wq); | |
900 | } | |
901 | ||
ab707e15 | 902 | /* must be called under the state lock */ |
6ff8da08 | 903 | void nfsd4_shutdown_callback(struct nfs4_client *clp) |
b5a1a81e | 904 | { |
6ff8da08 | 905 | set_bit(NFSD4_CLIENT_KILL, &clp->cl_cb_flags); |
b5a1a81e | 906 | /* |
6ff8da08 BF |
907 | * Note this won't actually result in a null callback; |
908 | * instead, nfsd4_do_callback_rpc() will detect the killed | |
909 | * client, destroy the rpc client, and stop: | |
b5a1a81e | 910 | */ |
6ff8da08 | 911 | do_probe_callback(clp); |
b5a1a81e | 912 | flush_workqueue(callback_wq); |
b5a1a81e BF |
913 | } |
914 | ||
5878453d | 915 | void nfsd4_release_cb(struct nfsd4_callback *cb) |
1da177e4 | 916 | { |
5878453d BF |
917 | if (cb->cb_ops->rpc_release) |
918 | cb->cb_ops->rpc_release(cb); | |
919 | } | |
920 | ||
6ff8da08 BF |
921 | void nfsd4_process_cb_update(struct nfsd4_callback *cb) |
922 | { | |
923 | struct nfs4_cb_conn conn; | |
924 | struct nfs4_client *clp = cb->cb_clp; | |
925 | int err; | |
926 | ||
927 | /* | |
928 | * This is either an update, or the client dying; in either case, | |
929 | * kill the old client: | |
930 | */ | |
931 | if (clp->cl_cb_client) { | |
932 | rpc_shutdown_client(clp->cl_cb_client); | |
933 | clp->cl_cb_client = NULL; | |
934 | } | |
935 | if (test_bit(NFSD4_CLIENT_KILL, &clp->cl_cb_flags)) | |
936 | return; | |
937 | spin_lock(&clp->cl_lock); | |
938 | /* | |
939 | * Only serialized callback code is allowed to clear these | |
940 | * flags; main nfsd code can only set them: | |
941 | */ | |
942 | BUG_ON(!clp->cl_cb_flags); | |
943 | clear_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_cb_flags); | |
944 | memcpy(&conn, &cb->cb_clp->cl_cb_conn, sizeof(struct nfs4_cb_conn)); | |
945 | spin_unlock(&clp->cl_lock); | |
946 | ||
947 | err = setup_callback_client(clp, &conn); | |
948 | if (err) | |
949 | warn_no_callback_path(clp, err); | |
950 | } | |
951 | ||
5878453d BF |
952 | void nfsd4_do_callback_rpc(struct work_struct *w) |
953 | { | |
954 | struct nfsd4_callback *cb = container_of(w, struct nfsd4_callback, cb_work); | |
fb003923 | 955 | struct nfs4_client *clp = cb->cb_clp; |
6ff8da08 | 956 | struct rpc_clnt *clnt; |
1da177e4 | 957 | |
6ff8da08 BF |
958 | if (clp->cl_cb_flags) |
959 | nfsd4_process_cb_update(cb); | |
960 | ||
961 | clnt = clp->cl_cb_client; | |
962 | if (!clnt) { | |
963 | /* Callback channel broken, or client killed; give up: */ | |
5878453d | 964 | nfsd4_release_cb(cb); |
6ff8da08 | 965 | return; |
ac94bf58 | 966 | } |
cee277d9 BF |
967 | rpc_call_async(clnt, &cb->cb_msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN, |
968 | cb->cb_ops, cb); | |
1da177e4 | 969 | } |
b5a1a81e | 970 | |
5878453d | 971 | void nfsd4_cb_recall(struct nfs4_delegation *dp) |
b5a1a81e | 972 | { |
5878453d | 973 | struct nfsd4_callback *cb = &dp->dl_recall; |
b5a1a81e | 974 | |
5878453d | 975 | dp->dl_retries = 1; |
fb003923 BF |
976 | cb->cb_op = dp; |
977 | cb->cb_clp = dp->dl_client; | |
5878453d | 978 | cb->cb_msg.rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_RECALL]; |
fb003923 BF |
979 | cb->cb_msg.rpc_argp = cb; |
980 | cb->cb_msg.rpc_resp = cb; | |
5878453d BF |
981 | cb->cb_msg.rpc_cred = callback_cred; |
982 | ||
983 | cb->cb_ops = &nfsd4_cb_recall_ops; | |
984 | dp->dl_retries = 1; | |
b5a1a81e | 985 | |
b5a1a81e BF |
986 | queue_work(callback_wq, &dp->dl_recall.cb_work); |
987 | } |