Commit | Line | Data |
---|---|---|
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 | */ | |
9f06c719 CL |
502 | static void nfs4_xdr_enc_cb_null(struct rpc_rqst *req, struct xdr_stream *xdr, |
503 | void *__unused) | |
1da177e4 | 504 | { |
a033db48 | 505 | xdr_reserve_space(xdr, 0); |
1da177e4 LT |
506 | } |
507 | ||
a033db48 CL |
508 | /* |
509 | * 20.2. Operation 4: CB_RECALL - Recall a Delegation | |
510 | */ | |
9f06c719 CL |
511 | static void nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, struct xdr_stream *xdr, |
512 | const struct nfsd4_callback *cb) | |
1da177e4 | 513 | { |
a033db48 | 514 | const struct nfs4_delegation *args = cb->cb_op; |
1da177e4 | 515 | struct nfs4_cb_compound_hdr hdr = { |
6ff8da08 | 516 | .ident = cb->cb_clp->cl_cb_ident, |
fb003923 | 517 | .minorversion = cb->cb_minorversion, |
1da177e4 LT |
518 | }; |
519 | ||
9f06c719 CL |
520 | encode_cb_compound4args(xdr, &hdr); |
521 | encode_cb_sequence4args(xdr, cb, &hdr); | |
522 | encode_cb_recall4args(xdr, args, &hdr); | |
ef52bff8 | 523 | encode_cb_nops(&hdr); |
1da177e4 LT |
524 | } |
525 | ||
526 | ||
2af73580 | 527 | /* |
85a56480 CL |
528 | * NFSv4.0 and NFSv4.1 XDR decode functions |
529 | * | |
530 | * NFSv4.0 callback result types are defined in section 15 of RFC | |
531 | * 3530: "Network File System (NFS) version 4 Protocol" and section 20 | |
532 | * of RFC 5661: "Network File System (NFS) Version 4 Minor Version 1 | |
533 | * Protocol". | |
2af73580 | 534 | */ |
2af73580 | 535 | |
85a56480 | 536 | static int nfs4_xdr_dec_cb_null(struct rpc_rqst *req, __be32 *p, void *__unused) |
1da177e4 LT |
537 | { |
538 | return 0; | |
539 | } | |
540 | ||
85a56480 CL |
541 | /* |
542 | * 20.2. Operation 4: CB_RECALL - Recall a Delegation | |
543 | */ | |
544 | static int nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp, __be32 *p, | |
545 | struct nfsd4_callback *cb) | |
1da177e4 LT |
546 | { |
547 | struct xdr_stream xdr; | |
548 | struct nfs4_cb_compound_hdr hdr; | |
85a56480 | 549 | enum nfsstat4 nfserr; |
1da177e4 LT |
550 | int status; |
551 | ||
552 | xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p); | |
85a56480 CL |
553 | status = decode_cb_compound4res(&xdr, &hdr); |
554 | if (unlikely(status)) | |
1da177e4 | 555 | goto out; |
85a56480 CL |
556 | |
557 | if (cb != NULL) { | |
558 | status = decode_cb_sequence4res(&xdr, cb); | |
559 | if (unlikely(status)) | |
0421b5c5 RL |
560 | goto out; |
561 | } | |
85a56480 CL |
562 | |
563 | status = decode_cb_op_status(&xdr, OP_CB_RECALL, &nfserr); | |
564 | if (unlikely(status)) | |
565 | goto out; | |
566 | if (unlikely(nfserr != NFS4_OK)) | |
567 | goto out_default; | |
1da177e4 LT |
568 | out: |
569 | return status; | |
85a56480 CL |
570 | out_default: |
571 | return nfs_cb_stat_to_errno(status); | |
1da177e4 LT |
572 | } |
573 | ||
574 | /* | |
575 | * RPC procedure tables | |
576 | */ | |
7d93bd71 CL |
577 | #define PROC(proc, call, argtype, restype) \ |
578 | [NFSPROC4_CLNT_##proc] = { \ | |
579 | .p_proc = NFSPROC4_CB_##call, \ | |
9f06c719 | 580 | .p_encode = (kxdreproc_t)nfs4_xdr_enc_##argtype, \ |
7d93bd71 CL |
581 | .p_decode = (kxdrproc_t)nfs4_xdr_dec_##restype, \ |
582 | .p_arglen = NFS4_enc_##argtype##_sz, \ | |
583 | .p_replen = NFS4_dec_##restype##_sz, \ | |
584 | .p_statidx = NFSPROC4_CB_##call, \ | |
585 | .p_name = #proc, \ | |
1da177e4 LT |
586 | } |
587 | ||
7d93bd71 CL |
588 | static struct rpc_procinfo nfs4_cb_procedures[] = { |
589 | PROC(CB_NULL, NULL, cb_null, cb_null), | |
590 | PROC(CB_RECALL, COMPOUND, cb_recall, cb_recall), | |
1da177e4 LT |
591 | }; |
592 | ||
7d93bd71 | 593 | static struct rpc_version nfs_cb_version4 = { |
b7299f44 BF |
594 | /* |
595 | * Note on the callback rpc program version number: despite language in rfc | |
596 | * 5661 section 18.36.3 requiring servers to use 4 in this field, the | |
597 | * official xdr descriptions for both 4.0 and 4.1 specify version 1, and | |
598 | * in practice that appears to be what implementations use. The section | |
599 | * 18.36.3 language is expected to be fixed in an erratum. | |
600 | */ | |
7d93bd71 CL |
601 | .number = 1, |
602 | .nrprocs = ARRAY_SIZE(nfs4_cb_procedures), | |
603 | .procs = nfs4_cb_procedures | |
1da177e4 LT |
604 | }; |
605 | ||
7d93bd71 | 606 | static struct rpc_version *nfs_cb_version[] = { |
1da177e4 LT |
607 | &nfs_cb_version4, |
608 | }; | |
609 | ||
ff7d9756 OK |
610 | static struct rpc_program cb_program; |
611 | ||
612 | static struct rpc_stat cb_stats = { | |
7d93bd71 | 613 | .program = &cb_program |
ff7d9756 OK |
614 | }; |
615 | ||
616 | #define NFS4_CALLBACK 0x40000000 | |
617 | static struct rpc_program cb_program = { | |
7d93bd71 CL |
618 | .name = "nfs4_cb", |
619 | .number = NFS4_CALLBACK, | |
620 | .nrvers = ARRAY_SIZE(nfs_cb_version), | |
621 | .version = nfs_cb_version, | |
622 | .stats = &cb_stats, | |
623 | .pipe_dir_name = "/nfsd4_cb", | |
ff7d9756 OK |
624 | }; |
625 | ||
595947ac BF |
626 | static int max_cb_time(void) |
627 | { | |
cf07d2ea | 628 | return max(nfsd4_lease/10, (time_t)1) * HZ; |
595947ac BF |
629 | } |
630 | ||
2b47eece | 631 | /* Reference counting, callback cleanup, etc., all look racy as heck. |
2bf23875 | 632 | * And why is cl_cb_set an atomic? */ |
2b47eece | 633 | |
07263f1e | 634 | int setup_callback_client(struct nfs4_client *clp, struct nfs4_cb_conn *conn) |
2b47eece | 635 | { |
ae5c7947 | 636 | struct rpc_timeout timeparms = { |
595947ac BF |
637 | .to_initval = max_cb_time(), |
638 | .to_retries = 0, | |
ae5c7947 | 639 | }; |
ae5c7947 | 640 | struct rpc_create_args args = { |
c653ce3f | 641 | .net = &init_net, |
07263f1e BF |
642 | .address = (struct sockaddr *) &conn->cb_addr, |
643 | .addrsize = conn->cb_addrlen, | |
ae5c7947 | 644 | .timeout = &timeparms, |
ff7d9756 | 645 | .program = &cb_program, |
b7299f44 | 646 | .version = 0, |
61054b14 | 647 | .authflavor = clp->cl_flavor, |
b6b6152c | 648 | .flags = (RPC_CLNT_CREATE_NOPING | RPC_CLNT_CREATE_QUIET), |
ae5c7947 | 649 | }; |
63c86716 | 650 | struct rpc_clnt *client; |
1da177e4 | 651 | |
5d18c1c2 BF |
652 | if (clp->cl_minorversion == 0) { |
653 | if (!clp->cl_principal && (clp->cl_flavor >= RPC_AUTH_GSS_KRB5)) | |
654 | return -EINVAL; | |
655 | args.client_name = clp->cl_principal; | |
656 | args.prognumber = conn->cb_prog, | |
657 | args.protocol = XPRT_TRANSPORT_TCP; | |
658 | clp->cl_cb_ident = conn->cb_ident; | |
659 | } else { | |
07263f1e | 660 | args.bc_xprt = conn->cb_xprt; |
8b5ce5cd | 661 | args.prognumber = clp->cl_cb_session->se_cb_prog; |
3ddc8bf5 AB |
662 | args.protocol = XPRT_TRANSPORT_BC_TCP; |
663 | } | |
ae5c7947 | 664 | /* Create RPC client */ |
63c86716 | 665 | client = rpc_create(&args); |
e1cab5a5 | 666 | if (IS_ERR(client)) { |
a601caed BF |
667 | dprintk("NFSD: couldn't create callback client: %ld\n", |
668 | PTR_ERR(client)); | |
e1cab5a5 BF |
669 | return PTR_ERR(client); |
670 | } | |
6ff8da08 | 671 | clp->cl_cb_client = client; |
e1cab5a5 | 672 | return 0; |
a601caed BF |
673 | |
674 | } | |
675 | ||
ecdd03b7 BF |
676 | static void warn_no_callback_path(struct nfs4_client *clp, int reason) |
677 | { | |
678 | dprintk("NFSD: warning: no callback path to client %.*s: error %d\n", | |
679 | (int)clp->cl_name.len, clp->cl_name.data, reason); | |
680 | } | |
681 | ||
e300a63c BF |
682 | static void nfsd4_cb_probe_done(struct rpc_task *task, void *calldata) |
683 | { | |
cee277d9 | 684 | struct nfs4_client *clp = container_of(calldata, struct nfs4_client, cl_cb_null); |
e300a63c BF |
685 | |
686 | if (task->tk_status) | |
687 | warn_no_callback_path(clp, task->tk_status); | |
688 | else | |
2bf23875 | 689 | atomic_set(&clp->cl_cb_set, 1); |
e300a63c BF |
690 | } |
691 | ||
692 | static const struct rpc_call_ops nfsd4_cb_probe_ops = { | |
cee277d9 BF |
693 | /* XXX: release method to ensure we set the cb channel down if |
694 | * necessary on early failure? */ | |
e300a63c BF |
695 | .rpc_call_done = nfsd4_cb_probe_done, |
696 | }; | |
697 | ||
80fc015b BF |
698 | static struct rpc_cred *callback_cred; |
699 | ||
700 | int set_callback_cred(void) | |
3cef9ab2 | 701 | { |
8d75da8a BF |
702 | if (callback_cred) |
703 | return 0; | |
80fc015b BF |
704 | callback_cred = rpc_lookup_machine_cred(); |
705 | if (!callback_cred) | |
706 | return -ENOMEM; | |
707 | return 0; | |
3cef9ab2 BF |
708 | } |
709 | ||
cee277d9 | 710 | static struct workqueue_struct *callback_wq; |
80fc015b | 711 | |
5a3c9d71 | 712 | static void do_probe_callback(struct nfs4_client *clp) |
a601caed | 713 | { |
cee277d9 | 714 | struct nfsd4_callback *cb = &clp->cl_cb_null; |
a601caed | 715 | |
fb003923 BF |
716 | cb->cb_op = NULL; |
717 | cb->cb_clp = clp; | |
cee277d9 BF |
718 | |
719 | cb->cb_msg.rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_NULL]; | |
720 | cb->cb_msg.rpc_argp = NULL; | |
721 | cb->cb_msg.rpc_resp = NULL; | |
722 | cb->cb_msg.rpc_cred = callback_cred; | |
723 | ||
724 | cb->cb_ops = &nfsd4_cb_probe_ops; | |
725 | ||
726 | queue_work(callback_wq, &cb->cb_work); | |
63c86716 BF |
727 | } |
728 | ||
729 | /* | |
5a3c9d71 BF |
730 | * Poke the callback thread to process any updates to the callback |
731 | * parameters, and send a null probe. | |
63c86716 | 732 | */ |
5a3c9d71 BF |
733 | void nfsd4_probe_callback(struct nfs4_client *clp) |
734 | { | |
735 | set_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_cb_flags); | |
736 | do_probe_callback(clp); | |
737 | } | |
738 | ||
739 | void nfsd4_change_callback(struct nfs4_client *clp, struct nfs4_cb_conn *conn) | |
63c86716 | 740 | { |
2bf23875 | 741 | BUG_ON(atomic_read(&clp->cl_cb_set)); |
63c86716 | 742 | |
6ff8da08 BF |
743 | spin_lock(&clp->cl_lock); |
744 | memcpy(&clp->cl_cb_conn, conn, sizeof(struct nfs4_cb_conn)); | |
6ff8da08 | 745 | spin_unlock(&clp->cl_lock); |
1da177e4 LT |
746 | } |
747 | ||
2a1d1b59 RL |
748 | /* |
749 | * There's currently a single callback channel slot. | |
750 | * If the slot is available, then mark it busy. Otherwise, set the | |
751 | * thread for sleeping on the callback RPC wait queue. | |
752 | */ | |
753 | static int nfsd41_cb_setup_sequence(struct nfs4_client *clp, | |
754 | struct rpc_task *task) | |
755 | { | |
90c8145b | 756 | u32 *ptr = (u32 *)clp->cl_cb_session->se_sessionid.data; |
2a1d1b59 RL |
757 | int status = 0; |
758 | ||
759 | dprintk("%s: %u:%u:%u:%u\n", __func__, | |
760 | ptr[0], ptr[1], ptr[2], ptr[3]); | |
761 | ||
762 | if (test_and_set_bit(0, &clp->cl_cb_slot_busy) != 0) { | |
763 | rpc_sleep_on(&clp->cl_cb_waitq, task, NULL); | |
764 | dprintk("%s slot is busy\n", __func__); | |
765 | status = -EAGAIN; | |
766 | goto out; | |
767 | } | |
2a1d1b59 RL |
768 | out: |
769 | dprintk("%s status=%d\n", __func__, status); | |
770 | return status; | |
771 | } | |
772 | ||
773 | /* | |
774 | * TODO: cb_sequence should support referring call lists, cachethis, multiple | |
775 | * slots, and mark callback channel down on communication errors. | |
776 | */ | |
777 | static void nfsd4_cb_prepare(struct rpc_task *task, void *calldata) | |
778 | { | |
5878453d BF |
779 | struct nfsd4_callback *cb = calldata; |
780 | struct nfs4_delegation *dp = container_of(cb, struct nfs4_delegation, dl_recall); | |
2a1d1b59 | 781 | struct nfs4_client *clp = dp->dl_client; |
8323c3b2 | 782 | u32 minorversion = clp->cl_minorversion; |
2a1d1b59 RL |
783 | int status = 0; |
784 | ||
fb003923 | 785 | cb->cb_minorversion = minorversion; |
2a1d1b59 RL |
786 | if (minorversion) { |
787 | status = nfsd41_cb_setup_sequence(clp, task); | |
788 | if (status) { | |
789 | if (status != -EAGAIN) { | |
790 | /* terminate rpc task */ | |
791 | task->tk_status = status; | |
792 | task->tk_action = NULL; | |
793 | } | |
794 | return; | |
795 | } | |
796 | } | |
797 | rpc_call_start(task); | |
798 | } | |
799 | ||
0421b5c5 RL |
800 | static void nfsd4_cb_done(struct rpc_task *task, void *calldata) |
801 | { | |
5878453d BF |
802 | struct nfsd4_callback *cb = calldata; |
803 | struct nfs4_delegation *dp = container_of(cb, struct nfs4_delegation, dl_recall); | |
0421b5c5 RL |
804 | struct nfs4_client *clp = dp->dl_client; |
805 | ||
806 | dprintk("%s: minorversion=%d\n", __func__, | |
8323c3b2 | 807 | clp->cl_minorversion); |
0421b5c5 | 808 | |
8323c3b2 | 809 | if (clp->cl_minorversion) { |
0421b5c5 | 810 | /* No need for lock, access serialized in nfsd4_cb_prepare */ |
ac7c46f2 | 811 | ++clp->cl_cb_session->se_cb_seq_nr; |
0421b5c5 RL |
812 | clear_bit(0, &clp->cl_cb_slot_busy); |
813 | rpc_wake_up_next(&clp->cl_cb_waitq); | |
814 | dprintk("%s: freed slot, new seqid=%d\n", __func__, | |
ac7c46f2 | 815 | clp->cl_cb_session->se_cb_seq_nr); |
0421b5c5 RL |
816 | |
817 | /* We're done looking into the sequence information */ | |
818 | task->tk_msg.rpc_resp = NULL; | |
819 | } | |
820 | } | |
821 | ||
4b21d0de | 822 | |
63e4863f BF |
823 | static void nfsd4_cb_recall_done(struct rpc_task *task, void *calldata) |
824 | { | |
5878453d BF |
825 | struct nfsd4_callback *cb = calldata; |
826 | struct nfs4_delegation *dp = container_of(cb, struct nfs4_delegation, dl_recall); | |
63e4863f | 827 | struct nfs4_client *clp = dp->dl_client; |
4b21d0de | 828 | struct rpc_clnt *current_rpc_client = clp->cl_cb_client; |
63e4863f | 829 | |
0421b5c5 RL |
830 | nfsd4_cb_done(task, calldata); |
831 | ||
4b21d0de BF |
832 | if (current_rpc_client == NULL) { |
833 | /* We're shutting down; give up. */ | |
834 | /* XXX: err, or is it ok just to fall through | |
835 | * and rpc_restart_call? */ | |
836 | return; | |
837 | } | |
838 | ||
63e4863f | 839 | switch (task->tk_status) { |
172c85dd BF |
840 | case 0: |
841 | return; | |
842 | case -EBADHANDLE: | |
843 | case -NFS4ERR_BAD_STATEID: | |
844 | /* Race: client probably got cb_recall | |
845 | * before open reply granting delegation */ | |
846 | break; | |
847 | default: | |
63e4863f | 848 | /* Network partition? */ |
2bf23875 | 849 | atomic_set(&clp->cl_cb_set, 0); |
63e4863f | 850 | warn_no_callback_path(clp, task->tk_status); |
4b21d0de BF |
851 | if (current_rpc_client != task->tk_client) { |
852 | /* queue a callback on the new connection: */ | |
cba9ba4b | 853 | atomic_inc(&dp->dl_count); |
4b21d0de BF |
854 | nfsd4_cb_recall(dp); |
855 | return; | |
856 | } | |
63e4863f BF |
857 | } |
858 | if (dp->dl_retries--) { | |
859 | rpc_delay(task, 2*HZ); | |
860 | task->tk_status = 0; | |
c18c821f | 861 | rpc_restart_call_prepare(task); |
0421b5c5 | 862 | return; |
63e4863f | 863 | } else { |
2bf23875 | 864 | atomic_set(&clp->cl_cb_set, 0); |
63e4863f BF |
865 | warn_no_callback_path(clp, task->tk_status); |
866 | } | |
867 | } | |
868 | ||
869 | static void nfsd4_cb_recall_release(void *calldata) | |
870 | { | |
5878453d BF |
871 | struct nfsd4_callback *cb = calldata; |
872 | struct nfs4_delegation *dp = container_of(cb, struct nfs4_delegation, dl_recall); | |
63e4863f BF |
873 | |
874 | nfs4_put_delegation(dp); | |
63e4863f BF |
875 | } |
876 | ||
877 | static const struct rpc_call_ops nfsd4_cb_recall_ops = { | |
2a1d1b59 | 878 | .rpc_call_prepare = nfsd4_cb_prepare, |
63e4863f BF |
879 | .rpc_call_done = nfsd4_cb_recall_done, |
880 | .rpc_release = nfsd4_cb_recall_release, | |
881 | }; | |
882 | ||
b5a1a81e BF |
883 | int nfsd4_create_callback_queue(void) |
884 | { | |
885 | callback_wq = create_singlethread_workqueue("nfsd4_callbacks"); | |
886 | if (!callback_wq) | |
887 | return -ENOMEM; | |
888 | return 0; | |
889 | } | |
890 | ||
891 | void nfsd4_destroy_callback_queue(void) | |
892 | { | |
893 | destroy_workqueue(callback_wq); | |
894 | } | |
895 | ||
ab707e15 | 896 | /* must be called under the state lock */ |
6ff8da08 | 897 | void nfsd4_shutdown_callback(struct nfs4_client *clp) |
b5a1a81e | 898 | { |
6ff8da08 | 899 | set_bit(NFSD4_CLIENT_KILL, &clp->cl_cb_flags); |
b5a1a81e | 900 | /* |
6ff8da08 BF |
901 | * Note this won't actually result in a null callback; |
902 | * instead, nfsd4_do_callback_rpc() will detect the killed | |
903 | * client, destroy the rpc client, and stop: | |
b5a1a81e | 904 | */ |
6ff8da08 | 905 | do_probe_callback(clp); |
b5a1a81e | 906 | flush_workqueue(callback_wq); |
b5a1a81e BF |
907 | } |
908 | ||
5878453d | 909 | void nfsd4_release_cb(struct nfsd4_callback *cb) |
1da177e4 | 910 | { |
5878453d BF |
911 | if (cb->cb_ops->rpc_release) |
912 | cb->cb_ops->rpc_release(cb); | |
913 | } | |
914 | ||
6ff8da08 BF |
915 | void nfsd4_process_cb_update(struct nfsd4_callback *cb) |
916 | { | |
917 | struct nfs4_cb_conn conn; | |
918 | struct nfs4_client *clp = cb->cb_clp; | |
919 | int err; | |
920 | ||
921 | /* | |
922 | * This is either an update, or the client dying; in either case, | |
923 | * kill the old client: | |
924 | */ | |
925 | if (clp->cl_cb_client) { | |
926 | rpc_shutdown_client(clp->cl_cb_client); | |
927 | clp->cl_cb_client = NULL; | |
928 | } | |
929 | if (test_bit(NFSD4_CLIENT_KILL, &clp->cl_cb_flags)) | |
930 | return; | |
931 | spin_lock(&clp->cl_lock); | |
932 | /* | |
933 | * Only serialized callback code is allowed to clear these | |
934 | * flags; main nfsd code can only set them: | |
935 | */ | |
936 | BUG_ON(!clp->cl_cb_flags); | |
937 | clear_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_cb_flags); | |
938 | memcpy(&conn, &cb->cb_clp->cl_cb_conn, sizeof(struct nfs4_cb_conn)); | |
939 | spin_unlock(&clp->cl_lock); | |
940 | ||
941 | err = setup_callback_client(clp, &conn); | |
942 | if (err) | |
943 | warn_no_callback_path(clp, err); | |
944 | } | |
945 | ||
5878453d BF |
946 | void nfsd4_do_callback_rpc(struct work_struct *w) |
947 | { | |
948 | struct nfsd4_callback *cb = container_of(w, struct nfsd4_callback, cb_work); | |
fb003923 | 949 | struct nfs4_client *clp = cb->cb_clp; |
6ff8da08 | 950 | struct rpc_clnt *clnt; |
1da177e4 | 951 | |
6ff8da08 BF |
952 | if (clp->cl_cb_flags) |
953 | nfsd4_process_cb_update(cb); | |
954 | ||
955 | clnt = clp->cl_cb_client; | |
956 | if (!clnt) { | |
957 | /* Callback channel broken, or client killed; give up: */ | |
5878453d | 958 | nfsd4_release_cb(cb); |
6ff8da08 | 959 | return; |
ac94bf58 | 960 | } |
cee277d9 BF |
961 | rpc_call_async(clnt, &cb->cb_msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN, |
962 | cb->cb_ops, cb); | |
1da177e4 | 963 | } |
b5a1a81e | 964 | |
5878453d | 965 | void nfsd4_cb_recall(struct nfs4_delegation *dp) |
b5a1a81e | 966 | { |
5878453d | 967 | struct nfsd4_callback *cb = &dp->dl_recall; |
b5a1a81e | 968 | |
5878453d | 969 | dp->dl_retries = 1; |
fb003923 BF |
970 | cb->cb_op = dp; |
971 | cb->cb_clp = dp->dl_client; | |
5878453d | 972 | cb->cb_msg.rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_RECALL]; |
fb003923 BF |
973 | cb->cb_msg.rpc_argp = cb; |
974 | cb->cb_msg.rpc_resp = cb; | |
5878453d BF |
975 | cb->cb_msg.rpc_cred = callback_cred; |
976 | ||
977 | cb->cb_ops = &nfsd4_cb_recall_ops; | |
978 | dp->dl_retries = 1; | |
b5a1a81e | 979 | |
b5a1a81e BF |
980 | queue_work(callback_wq, &dp->dl_recall.cb_work); |
981 | } |