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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" | |
3d733711 | 39 | #include "netns.h" |
06b332a5 | 40 | #include "xdr4cb.h" |
1da177e4 LT |
41 | |
42 | #define NFSDDBG_FACILITY NFSDDBG_PROC | |
43 | ||
5423732a BH |
44 | static void nfsd4_mark_cb_fault(struct nfs4_client *, int reason); |
45 | ||
1da177e4 LT |
46 | #define NFSPROC4_CB_NULL 0 |
47 | #define NFSPROC4_CB_COMPOUND 1 | |
48 | ||
1da177e4 LT |
49 | /* Index of predefined Linux callback client operations */ |
50 | ||
51 | enum { | |
4be36ca0 | 52 | NFSPROC4_CLNT_CB_NULL = 0, |
1da177e4 | 53 | NFSPROC4_CLNT_CB_RECALL, |
38524ab3 | 54 | NFSPROC4_CLNT_CB_SEQUENCE, |
1da177e4 LT |
55 | }; |
56 | ||
1da177e4 | 57 | struct nfs4_cb_compound_hdr { |
38524ab3 AA |
58 | /* args */ |
59 | u32 ident; /* minorversion 0 only */ | |
1da177e4 | 60 | u32 nops; |
ef52bff8 | 61 | __be32 *nops_p; |
ab52ae6d | 62 | u32 minorversion; |
38524ab3 AA |
63 | /* res */ |
64 | int status; | |
1da177e4 LT |
65 | }; |
66 | ||
85a56480 CL |
67 | /* |
68 | * Handle decode buffer overflows out-of-line. | |
69 | */ | |
70 | static void print_overflow_msg(const char *func, const struct xdr_stream *xdr) | |
1da177e4 | 71 | { |
85a56480 CL |
72 | dprintk("NFS: %s prematurely hit the end of our receive buffer. " |
73 | "Remaining buffer length is %tu words.\n", | |
74 | func, xdr->end - xdr->p); | |
1da177e4 LT |
75 | } |
76 | ||
a033db48 CL |
77 | static __be32 *xdr_encode_empty_array(__be32 *p) |
78 | { | |
79 | *p++ = xdr_zero; | |
80 | return p; | |
81 | } | |
82 | ||
83 | /* | |
84 | * Encode/decode NFSv4 CB basic data types | |
85 | * | |
86 | * Basic NFSv4 callback data types are defined in section 15 of RFC | |
87 | * 3530: "Network File System (NFS) version 4 Protocol" and section | |
88 | * 20 of RFC 5661: "Network File System (NFS) Version 4 Minor Version | |
89 | * 1 Protocol" | |
90 | */ | |
91 | ||
92 | /* | |
93 | * nfs_cb_opnum4 | |
94 | * | |
95 | * enum nfs_cb_opnum4 { | |
96 | * OP_CB_GETATTR = 3, | |
97 | * ... | |
98 | * }; | |
99 | */ | |
100 | enum nfs_cb_opnum4 { | |
101 | OP_CB_GETATTR = 3, | |
102 | OP_CB_RECALL = 4, | |
103 | OP_CB_LAYOUTRECALL = 5, | |
104 | OP_CB_NOTIFY = 6, | |
105 | OP_CB_PUSH_DELEG = 7, | |
106 | OP_CB_RECALL_ANY = 8, | |
107 | OP_CB_RECALLABLE_OBJ_AVAIL = 9, | |
108 | OP_CB_RECALL_SLOT = 10, | |
109 | OP_CB_SEQUENCE = 11, | |
110 | OP_CB_WANTS_CANCELLED = 12, | |
111 | OP_CB_NOTIFY_LOCK = 13, | |
112 | OP_CB_NOTIFY_DEVICEID = 14, | |
113 | OP_CB_ILLEGAL = 10044 | |
114 | }; | |
115 | ||
116 | static void encode_nfs_cb_opnum4(struct xdr_stream *xdr, enum nfs_cb_opnum4 op) | |
117 | { | |
118 | __be32 *p; | |
119 | ||
120 | p = xdr_reserve_space(xdr, 4); | |
121 | *p = cpu_to_be32(op); | |
122 | } | |
123 | ||
124 | /* | |
125 | * nfs_fh4 | |
126 | * | |
127 | * typedef opaque nfs_fh4<NFS4_FHSIZE>; | |
128 | */ | |
129 | static void encode_nfs_fh4(struct xdr_stream *xdr, const struct knfsd_fh *fh) | |
130 | { | |
131 | u32 length = fh->fh_size; | |
132 | __be32 *p; | |
133 | ||
134 | BUG_ON(length > NFS4_FHSIZE); | |
135 | p = xdr_reserve_space(xdr, 4 + length); | |
136 | xdr_encode_opaque(p, &fh->fh_base, length); | |
137 | } | |
138 | ||
1da177e4 | 139 | /* |
a033db48 CL |
140 | * stateid4 |
141 | * | |
142 | * struct stateid4 { | |
143 | * uint32_t seqid; | |
144 | * opaque other[12]; | |
145 | * }; | |
1da177e4 | 146 | */ |
a033db48 CL |
147 | static void encode_stateid4(struct xdr_stream *xdr, const stateid_t *sid) |
148 | { | |
149 | __be32 *p; | |
1da177e4 | 150 | |
a033db48 CL |
151 | p = xdr_reserve_space(xdr, NFS4_STATEID_SIZE); |
152 | *p++ = cpu_to_be32(sid->si_generation); | |
153 | xdr_encode_opaque_fixed(p, &sid->si_opaque, NFS4_STATEID_OTHER_SIZE); | |
154 | } | |
155 | ||
156 | /* | |
157 | * sessionid4 | |
158 | * | |
159 | * typedef opaque sessionid4[NFS4_SESSIONID_SIZE]; | |
160 | */ | |
161 | static void encode_sessionid4(struct xdr_stream *xdr, | |
162 | const struct nfsd4_session *session) | |
9303bbd3 BH |
163 | { |
164 | __be32 *p; | |
165 | ||
a033db48 CL |
166 | p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN); |
167 | xdr_encode_opaque_fixed(p, session->se_sessionid.data, | |
168 | NFS4_MAX_SESSIONID_LEN); | |
9303bbd3 BH |
169 | } |
170 | ||
85a56480 CL |
171 | /* |
172 | * nfsstat4 | |
173 | */ | |
174 | static const struct { | |
175 | int stat; | |
176 | int errno; | |
177 | } nfs_cb_errtbl[] = { | |
178 | { NFS4_OK, 0 }, | |
179 | { NFS4ERR_PERM, -EPERM }, | |
180 | { NFS4ERR_NOENT, -ENOENT }, | |
181 | { NFS4ERR_IO, -EIO }, | |
182 | { NFS4ERR_NXIO, -ENXIO }, | |
183 | { NFS4ERR_ACCESS, -EACCES }, | |
184 | { NFS4ERR_EXIST, -EEXIST }, | |
185 | { NFS4ERR_XDEV, -EXDEV }, | |
186 | { NFS4ERR_NOTDIR, -ENOTDIR }, | |
187 | { NFS4ERR_ISDIR, -EISDIR }, | |
188 | { NFS4ERR_INVAL, -EINVAL }, | |
189 | { NFS4ERR_FBIG, -EFBIG }, | |
190 | { NFS4ERR_NOSPC, -ENOSPC }, | |
191 | { NFS4ERR_ROFS, -EROFS }, | |
192 | { NFS4ERR_MLINK, -EMLINK }, | |
193 | { NFS4ERR_NAMETOOLONG, -ENAMETOOLONG }, | |
194 | { NFS4ERR_NOTEMPTY, -ENOTEMPTY }, | |
195 | { NFS4ERR_DQUOT, -EDQUOT }, | |
196 | { NFS4ERR_STALE, -ESTALE }, | |
197 | { NFS4ERR_BADHANDLE, -EBADHANDLE }, | |
198 | { NFS4ERR_BAD_COOKIE, -EBADCOOKIE }, | |
199 | { NFS4ERR_NOTSUPP, -ENOTSUPP }, | |
200 | { NFS4ERR_TOOSMALL, -ETOOSMALL }, | |
201 | { NFS4ERR_SERVERFAULT, -ESERVERFAULT }, | |
202 | { NFS4ERR_BADTYPE, -EBADTYPE }, | |
203 | { NFS4ERR_LOCKED, -EAGAIN }, | |
204 | { NFS4ERR_RESOURCE, -EREMOTEIO }, | |
205 | { NFS4ERR_SYMLINK, -ELOOP }, | |
206 | { NFS4ERR_OP_ILLEGAL, -EOPNOTSUPP }, | |
207 | { NFS4ERR_DEADLOCK, -EDEADLK }, | |
208 | { -1, -EIO } | |
209 | }; | |
210 | ||
211 | /* | |
212 | * If we cannot translate the error, the recovery routines should | |
213 | * handle it. | |
214 | * | |
215 | * Note: remaining NFSv4 error codes have values > 10000, so should | |
216 | * not conflict with native Linux error codes. | |
217 | */ | |
218 | static int nfs_cb_stat_to_errno(int status) | |
219 | { | |
220 | int i; | |
221 | ||
222 | for (i = 0; nfs_cb_errtbl[i].stat != -1; i++) { | |
223 | if (nfs_cb_errtbl[i].stat == status) | |
224 | return nfs_cb_errtbl[i].errno; | |
225 | } | |
226 | ||
227 | dprintk("NFSD: Unrecognized NFS CB status value: %u\n", status); | |
228 | return -status; | |
229 | } | |
230 | ||
231 | static int decode_cb_op_status(struct xdr_stream *xdr, enum nfs_opnum4 expected, | |
232 | enum nfsstat4 *status) | |
233 | { | |
234 | __be32 *p; | |
235 | u32 op; | |
236 | ||
237 | p = xdr_inline_decode(xdr, 4 + 4); | |
238 | if (unlikely(p == NULL)) | |
239 | goto out_overflow; | |
240 | op = be32_to_cpup(p++); | |
241 | if (unlikely(op != expected)) | |
242 | goto out_unexpected; | |
243 | *status = be32_to_cpup(p); | |
244 | return 0; | |
245 | out_overflow: | |
246 | print_overflow_msg(__func__, xdr); | |
247 | return -EIO; | |
248 | out_unexpected: | |
249 | dprintk("NFSD: Callback server returned operation %d but " | |
250 | "we issued a request for %d\n", op, expected); | |
251 | return -EIO; | |
252 | } | |
253 | ||
a033db48 CL |
254 | /* |
255 | * CB_COMPOUND4args | |
256 | * | |
257 | * struct CB_COMPOUND4args { | |
258 | * utf8str_cs tag; | |
259 | * uint32_t minorversion; | |
260 | * uint32_t callback_ident; | |
261 | * nfs_cb_argop4 argarray<>; | |
262 | * }; | |
263 | */ | |
264 | static void encode_cb_compound4args(struct xdr_stream *xdr, | |
265 | struct nfs4_cb_compound_hdr *hdr) | |
1da177e4 | 266 | { |
f00f328f | 267 | __be32 * p; |
1da177e4 | 268 | |
a033db48 CL |
269 | p = xdr_reserve_space(xdr, 4 + 4 + 4 + 4); |
270 | p = xdr_encode_empty_array(p); /* empty tag */ | |
271 | *p++ = cpu_to_be32(hdr->minorversion); | |
272 | *p++ = cpu_to_be32(hdr->ident); | |
273 | ||
ef52bff8 | 274 | hdr->nops_p = p; |
a033db48 | 275 | *p = cpu_to_be32(hdr->nops); /* argarray element count */ |
1da177e4 LT |
276 | } |
277 | ||
a033db48 CL |
278 | /* |
279 | * Update argarray element count | |
280 | */ | |
ef52bff8 AA |
281 | static void encode_cb_nops(struct nfs4_cb_compound_hdr *hdr) |
282 | { | |
a033db48 CL |
283 | BUG_ON(hdr->nops > NFS4_MAX_BACK_CHANNEL_OPS); |
284 | *hdr->nops_p = cpu_to_be32(hdr->nops); | |
ef52bff8 AA |
285 | } |
286 | ||
85a56480 CL |
287 | /* |
288 | * CB_COMPOUND4res | |
289 | * | |
290 | * struct CB_COMPOUND4res { | |
291 | * nfsstat4 status; | |
292 | * utf8str_cs tag; | |
293 | * nfs_cb_resop4 resarray<>; | |
294 | * }; | |
295 | */ | |
296 | static int decode_cb_compound4res(struct xdr_stream *xdr, | |
297 | struct nfs4_cb_compound_hdr *hdr) | |
298 | { | |
299 | u32 length; | |
300 | __be32 *p; | |
301 | ||
302 | p = xdr_inline_decode(xdr, 4 + 4); | |
303 | if (unlikely(p == NULL)) | |
304 | goto out_overflow; | |
305 | hdr->status = be32_to_cpup(p++); | |
306 | /* Ignore the tag */ | |
307 | length = be32_to_cpup(p++); | |
308 | p = xdr_inline_decode(xdr, length + 4); | |
309 | if (unlikely(p == NULL)) | |
310 | goto out_overflow; | |
311 | hdr->nops = be32_to_cpup(p); | |
312 | return 0; | |
313 | out_overflow: | |
314 | print_overflow_msg(__func__, xdr); | |
315 | return -EIO; | |
316 | } | |
317 | ||
a033db48 CL |
318 | /* |
319 | * CB_RECALL4args | |
320 | * | |
321 | * struct CB_RECALL4args { | |
322 | * stateid4 stateid; | |
323 | * bool truncate; | |
324 | * nfs_fh4 fh; | |
325 | * }; | |
326 | */ | |
327 | static void encode_cb_recall4args(struct xdr_stream *xdr, | |
328 | const struct nfs4_delegation *dp, | |
329 | struct nfs4_cb_compound_hdr *hdr) | |
1da177e4 | 330 | { |
f00f328f | 331 | __be32 *p; |
a033db48 CL |
332 | |
333 | encode_nfs_cb_opnum4(xdr, OP_CB_RECALL); | |
d5477a8d | 334 | encode_stateid4(xdr, &dp->dl_stid.sc_stateid); |
a033db48 CL |
335 | |
336 | p = xdr_reserve_space(xdr, 4); | |
337 | *p++ = xdr_zero; /* truncate */ | |
338 | ||
339 | encode_nfs_fh4(xdr, &dp->dl_fh); | |
340 | ||
ef52bff8 | 341 | hdr->nops++; |
1da177e4 LT |
342 | } |
343 | ||
a033db48 CL |
344 | /* |
345 | * CB_SEQUENCE4args | |
346 | * | |
347 | * struct CB_SEQUENCE4args { | |
348 | * sessionid4 csa_sessionid; | |
349 | * sequenceid4 csa_sequenceid; | |
350 | * slotid4 csa_slotid; | |
351 | * slotid4 csa_highest_slotid; | |
352 | * bool csa_cachethis; | |
353 | * referring_call_list4 csa_referring_call_lists<>; | |
354 | * }; | |
355 | */ | |
356 | static void encode_cb_sequence4args(struct xdr_stream *xdr, | |
357 | const struct nfsd4_callback *cb, | |
358 | struct nfs4_cb_compound_hdr *hdr) | |
2af73580 | 359 | { |
a033db48 | 360 | struct nfsd4_session *session = cb->cb_clp->cl_cb_session; |
2af73580 BH |
361 | __be32 *p; |
362 | ||
363 | if (hdr->minorversion == 0) | |
364 | return; | |
365 | ||
a033db48 CL |
366 | encode_nfs_cb_opnum4(xdr, OP_CB_SEQUENCE); |
367 | encode_sessionid4(xdr, session); | |
368 | ||
369 | p = xdr_reserve_space(xdr, 4 + 4 + 4 + 4 + 4); | |
370 | *p++ = cpu_to_be32(session->se_cb_seq_nr); /* csa_sequenceid */ | |
371 | *p++ = xdr_zero; /* csa_slotid */ | |
372 | *p++ = xdr_zero; /* csa_highest_slotid */ | |
373 | *p++ = xdr_zero; /* csa_cachethis */ | |
374 | xdr_encode_empty_array(p); /* csa_referring_call_lists */ | |
2af73580 | 375 | |
2af73580 BH |
376 | hdr->nops++; |
377 | } | |
378 | ||
85a56480 CL |
379 | /* |
380 | * CB_SEQUENCE4resok | |
381 | * | |
382 | * struct CB_SEQUENCE4resok { | |
383 | * sessionid4 csr_sessionid; | |
384 | * sequenceid4 csr_sequenceid; | |
385 | * slotid4 csr_slotid; | |
386 | * slotid4 csr_highest_slotid; | |
387 | * slotid4 csr_target_highest_slotid; | |
388 | * }; | |
389 | * | |
390 | * union CB_SEQUENCE4res switch (nfsstat4 csr_status) { | |
391 | * case NFS4_OK: | |
392 | * CB_SEQUENCE4resok csr_resok4; | |
393 | * default: | |
394 | * void; | |
395 | * }; | |
396 | * | |
397 | * Our current back channel implmentation supports a single backchannel | |
398 | * with a single slot. | |
399 | */ | |
400 | static int decode_cb_sequence4resok(struct xdr_stream *xdr, | |
401 | struct nfsd4_callback *cb) | |
402 | { | |
403 | struct nfsd4_session *session = cb->cb_clp->cl_cb_session; | |
404 | struct nfs4_sessionid id; | |
405 | int status; | |
406 | __be32 *p; | |
407 | u32 dummy; | |
408 | ||
409 | status = -ESERVERFAULT; | |
410 | ||
411 | /* | |
412 | * If the server returns different values for sessionID, slotID or | |
413 | * sequence number, the server is looney tunes. | |
414 | */ | |
2c9c8f36 | 415 | p = xdr_inline_decode(xdr, NFS4_MAX_SESSIONID_LEN + 4 + 4 + 4 + 4); |
85a56480 CL |
416 | if (unlikely(p == NULL)) |
417 | goto out_overflow; | |
418 | memcpy(id.data, p, NFS4_MAX_SESSIONID_LEN); | |
419 | if (memcmp(id.data, session->se_sessionid.data, | |
420 | NFS4_MAX_SESSIONID_LEN) != 0) { | |
421 | dprintk("NFS: %s Invalid session id\n", __func__); | |
422 | goto out; | |
423 | } | |
424 | p += XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN); | |
425 | ||
426 | dummy = be32_to_cpup(p++); | |
427 | if (dummy != session->se_cb_seq_nr) { | |
428 | dprintk("NFS: %s Invalid sequence number\n", __func__); | |
429 | goto out; | |
430 | } | |
431 | ||
432 | dummy = be32_to_cpup(p++); | |
433 | if (dummy != 0) { | |
434 | dprintk("NFS: %s Invalid slotid\n", __func__); | |
435 | goto out; | |
436 | } | |
437 | ||
438 | /* | |
439 | * FIXME: process highest slotid and target highest slotid | |
440 | */ | |
441 | status = 0; | |
442 | out: | |
5423732a BH |
443 | if (status) |
444 | nfsd4_mark_cb_fault(cb->cb_clp, status); | |
85a56480 CL |
445 | return status; |
446 | out_overflow: | |
447 | print_overflow_msg(__func__, xdr); | |
448 | return -EIO; | |
449 | } | |
450 | ||
451 | static int decode_cb_sequence4res(struct xdr_stream *xdr, | |
452 | struct nfsd4_callback *cb) | |
453 | { | |
454 | enum nfsstat4 nfserr; | |
455 | int status; | |
456 | ||
457 | if (cb->cb_minorversion == 0) | |
458 | return 0; | |
459 | ||
460 | status = decode_cb_op_status(xdr, OP_CB_SEQUENCE, &nfserr); | |
461 | if (unlikely(status)) | |
462 | goto out; | |
463 | if (unlikely(nfserr != NFS4_OK)) | |
464 | goto out_default; | |
465 | status = decode_cb_sequence4resok(xdr, cb); | |
466 | out: | |
467 | return status; | |
468 | out_default: | |
0af3f814 | 469 | return nfs_cb_stat_to_errno(nfserr); |
85a56480 CL |
470 | } |
471 | ||
a033db48 CL |
472 | /* |
473 | * NFSv4.0 and NFSv4.1 XDR encode functions | |
474 | * | |
475 | * NFSv4.0 callback argument types are defined in section 15 of RFC | |
476 | * 3530: "Network File System (NFS) version 4 Protocol" and section 20 | |
477 | * of RFC 5661: "Network File System (NFS) Version 4 Minor Version 1 | |
478 | * Protocol". | |
479 | */ | |
480 | ||
481 | /* | |
482 | * NB: Without this zero space reservation, callbacks over krb5p fail | |
483 | */ | |
9f06c719 CL |
484 | static void nfs4_xdr_enc_cb_null(struct rpc_rqst *req, struct xdr_stream *xdr, |
485 | void *__unused) | |
1da177e4 | 486 | { |
a033db48 | 487 | xdr_reserve_space(xdr, 0); |
1da177e4 LT |
488 | } |
489 | ||
a033db48 CL |
490 | /* |
491 | * 20.2. Operation 4: CB_RECALL - Recall a Delegation | |
492 | */ | |
9f06c719 CL |
493 | static void nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, struct xdr_stream *xdr, |
494 | const struct nfsd4_callback *cb) | |
1da177e4 | 495 | { |
a033db48 | 496 | const struct nfs4_delegation *args = cb->cb_op; |
1da177e4 | 497 | struct nfs4_cb_compound_hdr hdr = { |
6ff8da08 | 498 | .ident = cb->cb_clp->cl_cb_ident, |
fb003923 | 499 | .minorversion = cb->cb_minorversion, |
1da177e4 LT |
500 | }; |
501 | ||
9f06c719 CL |
502 | encode_cb_compound4args(xdr, &hdr); |
503 | encode_cb_sequence4args(xdr, cb, &hdr); | |
504 | encode_cb_recall4args(xdr, args, &hdr); | |
ef52bff8 | 505 | encode_cb_nops(&hdr); |
1da177e4 LT |
506 | } |
507 | ||
508 | ||
2af73580 | 509 | /* |
85a56480 CL |
510 | * NFSv4.0 and NFSv4.1 XDR decode functions |
511 | * | |
512 | * NFSv4.0 callback result types are defined in section 15 of RFC | |
513 | * 3530: "Network File System (NFS) version 4 Protocol" and section 20 | |
514 | * of RFC 5661: "Network File System (NFS) Version 4 Minor Version 1 | |
515 | * Protocol". | |
2af73580 | 516 | */ |
2af73580 | 517 | |
bf269551 CL |
518 | static int nfs4_xdr_dec_cb_null(struct rpc_rqst *req, struct xdr_stream *xdr, |
519 | void *__unused) | |
1da177e4 LT |
520 | { |
521 | return 0; | |
522 | } | |
523 | ||
85a56480 CL |
524 | /* |
525 | * 20.2. Operation 4: CB_RECALL - Recall a Delegation | |
526 | */ | |
bf269551 CL |
527 | static int nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp, |
528 | struct xdr_stream *xdr, | |
85a56480 | 529 | struct nfsd4_callback *cb) |
1da177e4 | 530 | { |
1da177e4 | 531 | struct nfs4_cb_compound_hdr hdr; |
85a56480 | 532 | enum nfsstat4 nfserr; |
1da177e4 LT |
533 | int status; |
534 | ||
bf269551 | 535 | status = decode_cb_compound4res(xdr, &hdr); |
85a56480 | 536 | if (unlikely(status)) |
1da177e4 | 537 | goto out; |
85a56480 CL |
538 | |
539 | if (cb != NULL) { | |
bf269551 | 540 | status = decode_cb_sequence4res(xdr, cb); |
85a56480 | 541 | if (unlikely(status)) |
0421b5c5 RL |
542 | goto out; |
543 | } | |
85a56480 | 544 | |
bf269551 | 545 | status = decode_cb_op_status(xdr, OP_CB_RECALL, &nfserr); |
85a56480 CL |
546 | if (unlikely(status)) |
547 | goto out; | |
548 | if (unlikely(nfserr != NFS4_OK)) | |
0af3f814 | 549 | status = nfs_cb_stat_to_errno(nfserr); |
1da177e4 LT |
550 | out: |
551 | return status; | |
552 | } | |
553 | ||
554 | /* | |
555 | * RPC procedure tables | |
556 | */ | |
7d93bd71 CL |
557 | #define PROC(proc, call, argtype, restype) \ |
558 | [NFSPROC4_CLNT_##proc] = { \ | |
559 | .p_proc = NFSPROC4_CB_##call, \ | |
9f06c719 | 560 | .p_encode = (kxdreproc_t)nfs4_xdr_enc_##argtype, \ |
bf269551 | 561 | .p_decode = (kxdrdproc_t)nfs4_xdr_dec_##restype, \ |
7d93bd71 CL |
562 | .p_arglen = NFS4_enc_##argtype##_sz, \ |
563 | .p_replen = NFS4_dec_##restype##_sz, \ | |
564 | .p_statidx = NFSPROC4_CB_##call, \ | |
565 | .p_name = #proc, \ | |
1da177e4 LT |
566 | } |
567 | ||
7d93bd71 CL |
568 | static struct rpc_procinfo nfs4_cb_procedures[] = { |
569 | PROC(CB_NULL, NULL, cb_null, cb_null), | |
570 | PROC(CB_RECALL, COMPOUND, cb_recall, cb_recall), | |
1da177e4 LT |
571 | }; |
572 | ||
7d93bd71 | 573 | static struct rpc_version nfs_cb_version4 = { |
b7299f44 BF |
574 | /* |
575 | * Note on the callback rpc program version number: despite language in rfc | |
576 | * 5661 section 18.36.3 requiring servers to use 4 in this field, the | |
577 | * official xdr descriptions for both 4.0 and 4.1 specify version 1, and | |
578 | * in practice that appears to be what implementations use. The section | |
579 | * 18.36.3 language is expected to be fixed in an erratum. | |
580 | */ | |
7d93bd71 CL |
581 | .number = 1, |
582 | .nrprocs = ARRAY_SIZE(nfs4_cb_procedures), | |
583 | .procs = nfs4_cb_procedures | |
1da177e4 LT |
584 | }; |
585 | ||
a613fa16 | 586 | static const struct rpc_version *nfs_cb_version[] = { |
1da177e4 LT |
587 | &nfs_cb_version4, |
588 | }; | |
589 | ||
a613fa16 | 590 | static const struct rpc_program cb_program; |
ff7d9756 OK |
591 | |
592 | static struct rpc_stat cb_stats = { | |
7d93bd71 | 593 | .program = &cb_program |
ff7d9756 OK |
594 | }; |
595 | ||
596 | #define NFS4_CALLBACK 0x40000000 | |
a613fa16 | 597 | static const struct rpc_program cb_program = { |
7d93bd71 CL |
598 | .name = "nfs4_cb", |
599 | .number = NFS4_CALLBACK, | |
600 | .nrvers = ARRAY_SIZE(nfs_cb_version), | |
601 | .version = nfs_cb_version, | |
602 | .stats = &cb_stats, | |
0157d021 | 603 | .pipe_dir_name = "nfsd4_cb", |
ff7d9756 OK |
604 | }; |
605 | ||
3d733711 | 606 | static int max_cb_time(struct net *net) |
595947ac | 607 | { |
3d733711 SK |
608 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
609 | return max(nn->nfsd4_lease/10, (time_t)1) * HZ; | |
595947ac BF |
610 | } |
611 | ||
c6bb3ca2 BF |
612 | static struct rpc_cred *callback_cred; |
613 | ||
614 | int set_callback_cred(void) | |
615 | { | |
616 | if (callback_cred) | |
617 | return 0; | |
618 | callback_cred = rpc_lookup_machine_cred("nfs"); | |
619 | if (!callback_cred) | |
620 | return -ENOMEM; | |
621 | return 0; | |
622 | } | |
623 | ||
2b4cf668 | 624 | static struct rpc_cred *get_backchannel_cred(struct nfs4_client *clp, struct rpc_clnt *client, struct nfsd4_session *ses) |
c6bb3ca2 BF |
625 | { |
626 | if (clp->cl_minorversion == 0) { | |
627 | return get_rpccred(callback_cred); | |
628 | } else { | |
629 | struct rpc_auth *auth = client->cl_auth; | |
630 | struct auth_cred acred = {}; | |
631 | ||
632 | acred.uid = ses->se_cb_sec.uid; | |
633 | acred.gid = ses->se_cb_sec.gid; | |
634 | return auth->au_ops->lookup_cred(client->cl_auth, &acred, 0); | |
635 | } | |
636 | } | |
2b47eece | 637 | |
dcbeaa68 | 638 | static int setup_callback_client(struct nfs4_client *clp, struct nfs4_cb_conn *conn, struct nfsd4_session *ses) |
2b47eece | 639 | { |
ae5c7947 | 640 | struct rpc_timeout timeparms = { |
3d733711 | 641 | .to_initval = max_cb_time(clp->net), |
595947ac | 642 | .to_retries = 0, |
ae5c7947 | 643 | }; |
ae5c7947 | 644 | struct rpc_create_args args = { |
c212cecf | 645 | .net = clp->net, |
07263f1e BF |
646 | .address = (struct sockaddr *) &conn->cb_addr, |
647 | .addrsize = conn->cb_addrlen, | |
6f3d772f | 648 | .saddress = (struct sockaddr *) &conn->cb_saddr, |
ae5c7947 | 649 | .timeout = &timeparms, |
ff7d9756 | 650 | .program = &cb_program, |
b7299f44 | 651 | .version = 0, |
b6b6152c | 652 | .flags = (RPC_CLNT_CREATE_NOPING | RPC_CLNT_CREATE_QUIET), |
ae5c7947 | 653 | }; |
63c86716 | 654 | struct rpc_clnt *client; |
c6bb3ca2 | 655 | struct rpc_cred *cred; |
1da177e4 | 656 | |
5d18c1c2 | 657 | if (clp->cl_minorversion == 0) { |
03a4e1f6 | 658 | if (!clp->cl_cred.cr_principal && |
39307655 | 659 | (clp->cl_cred.cr_flavor >= RPC_AUTH_GSS_KRB5)) |
5d18c1c2 | 660 | return -EINVAL; |
03a4e1f6 | 661 | args.client_name = clp->cl_cred.cr_principal; |
5d18c1c2 BF |
662 | args.prognumber = conn->cb_prog, |
663 | args.protocol = XPRT_TRANSPORT_TCP; | |
39307655 | 664 | args.authflavor = clp->cl_cred.cr_flavor; |
5d18c1c2 BF |
665 | clp->cl_cb_ident = conn->cb_ident; |
666 | } else { | |
dcbeaa68 BF |
667 | if (!conn->cb_xprt) |
668 | return -EINVAL; | |
669 | clp->cl_cb_conn.cb_xprt = conn->cb_xprt; | |
670 | clp->cl_cb_session = ses; | |
07263f1e | 671 | args.bc_xprt = conn->cb_xprt; |
8b5ce5cd | 672 | args.prognumber = clp->cl_cb_session->se_cb_prog; |
3ddc8bf5 | 673 | args.protocol = XPRT_TRANSPORT_BC_TCP; |
12fc3e92 | 674 | args.authflavor = ses->se_cb_sec.flavor; |
3ddc8bf5 | 675 | } |
ae5c7947 | 676 | /* Create RPC client */ |
63c86716 | 677 | client = rpc_create(&args); |
e1cab5a5 | 678 | if (IS_ERR(client)) { |
a601caed BF |
679 | dprintk("NFSD: couldn't create callback client: %ld\n", |
680 | PTR_ERR(client)); | |
e1cab5a5 BF |
681 | return PTR_ERR(client); |
682 | } | |
c6bb3ca2 BF |
683 | cred = get_backchannel_cred(clp, client, ses); |
684 | if (IS_ERR(cred)) { | |
685 | rpc_shutdown_client(client); | |
686 | return PTR_ERR(cred); | |
687 | } | |
6ff8da08 | 688 | clp->cl_cb_client = client; |
c6bb3ca2 | 689 | clp->cl_cb_cred = cred; |
e1cab5a5 | 690 | return 0; |
a601caed BF |
691 | } |
692 | ||
ecdd03b7 BF |
693 | static void warn_no_callback_path(struct nfs4_client *clp, int reason) |
694 | { | |
695 | dprintk("NFSD: warning: no callback path to client %.*s: error %d\n", | |
696 | (int)clp->cl_name.len, clp->cl_name.data, reason); | |
697 | } | |
698 | ||
77a3569d BF |
699 | static void nfsd4_mark_cb_down(struct nfs4_client *clp, int reason) |
700 | { | |
701 | clp->cl_cb_state = NFSD4_CB_DOWN; | |
702 | warn_no_callback_path(clp, reason); | |
703 | } | |
704 | ||
5423732a BH |
705 | static void nfsd4_mark_cb_fault(struct nfs4_client *clp, int reason) |
706 | { | |
707 | clp->cl_cb_state = NFSD4_CB_FAULT; | |
708 | warn_no_callback_path(clp, reason); | |
709 | } | |
710 | ||
e300a63c BF |
711 | static void nfsd4_cb_probe_done(struct rpc_task *task, void *calldata) |
712 | { | |
cee277d9 | 713 | struct nfs4_client *clp = container_of(calldata, struct nfs4_client, cl_cb_null); |
e300a63c BF |
714 | |
715 | if (task->tk_status) | |
77a3569d | 716 | nfsd4_mark_cb_down(clp, task->tk_status); |
e300a63c | 717 | else |
77a3569d | 718 | clp->cl_cb_state = NFSD4_CB_UP; |
e300a63c BF |
719 | } |
720 | ||
721 | static const struct rpc_call_ops nfsd4_cb_probe_ops = { | |
cee277d9 BF |
722 | /* XXX: release method to ensure we set the cb channel down if |
723 | * necessary on early failure? */ | |
e300a63c BF |
724 | .rpc_call_done = nfsd4_cb_probe_done, |
725 | }; | |
726 | ||
cee277d9 | 727 | static struct workqueue_struct *callback_wq; |
80fc015b | 728 | |
229b2a08 BF |
729 | static void run_nfsd4_cb(struct nfsd4_callback *cb) |
730 | { | |
731 | queue_work(callback_wq, &cb->cb_work); | |
732 | } | |
733 | ||
5a3c9d71 | 734 | static void do_probe_callback(struct nfs4_client *clp) |
a601caed | 735 | { |
cee277d9 | 736 | struct nfsd4_callback *cb = &clp->cl_cb_null; |
a601caed | 737 | |
fb003923 BF |
738 | cb->cb_op = NULL; |
739 | cb->cb_clp = clp; | |
cee277d9 BF |
740 | |
741 | cb->cb_msg.rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_NULL]; | |
742 | cb->cb_msg.rpc_argp = NULL; | |
743 | cb->cb_msg.rpc_resp = NULL; | |
cee277d9 BF |
744 | |
745 | cb->cb_ops = &nfsd4_cb_probe_ops; | |
746 | ||
229b2a08 | 747 | run_nfsd4_cb(cb); |
63c86716 BF |
748 | } |
749 | ||
750 | /* | |
5a3c9d71 BF |
751 | * Poke the callback thread to process any updates to the callback |
752 | * parameters, and send a null probe. | |
63c86716 | 753 | */ |
5a3c9d71 BF |
754 | void nfsd4_probe_callback(struct nfs4_client *clp) |
755 | { | |
77a3569d | 756 | clp->cl_cb_state = NFSD4_CB_UNKNOWN; |
a52d726b | 757 | set_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags); |
5a3c9d71 BF |
758 | do_probe_callback(clp); |
759 | } | |
760 | ||
84f5f7cc | 761 | void nfsd4_probe_callback_sync(struct nfs4_client *clp) |
63c86716 | 762 | { |
84f5f7cc BF |
763 | nfsd4_probe_callback(clp); |
764 | flush_workqueue(callback_wq); | |
765 | } | |
63c86716 | 766 | |
5a3c9d71 | 767 | void nfsd4_change_callback(struct nfs4_client *clp, struct nfs4_cb_conn *conn) |
63c86716 | 768 | { |
77a3569d | 769 | clp->cl_cb_state = NFSD4_CB_UNKNOWN; |
6ff8da08 BF |
770 | spin_lock(&clp->cl_lock); |
771 | memcpy(&clp->cl_cb_conn, conn, sizeof(struct nfs4_cb_conn)); | |
6ff8da08 | 772 | spin_unlock(&clp->cl_lock); |
1da177e4 LT |
773 | } |
774 | ||
2a1d1b59 RL |
775 | /* |
776 | * There's currently a single callback channel slot. | |
777 | * If the slot is available, then mark it busy. Otherwise, set the | |
778 | * thread for sleeping on the callback RPC wait queue. | |
779 | */ | |
3ff3600e | 780 | static bool nfsd41_cb_get_slot(struct nfs4_client *clp, struct rpc_task *task) |
2a1d1b59 | 781 | { |
2a1d1b59 RL |
782 | if (test_and_set_bit(0, &clp->cl_cb_slot_busy) != 0) { |
783 | rpc_sleep_on(&clp->cl_cb_waitq, task, NULL); | |
784 | dprintk("%s slot is busy\n", __func__); | |
3ff3600e | 785 | return false; |
2a1d1b59 | 786 | } |
3ff3600e | 787 | return true; |
2a1d1b59 RL |
788 | } |
789 | ||
790 | /* | |
791 | * TODO: cb_sequence should support referring call lists, cachethis, multiple | |
792 | * slots, and mark callback channel down on communication errors. | |
793 | */ | |
794 | static void nfsd4_cb_prepare(struct rpc_task *task, void *calldata) | |
795 | { | |
5878453d | 796 | struct nfsd4_callback *cb = calldata; |
8be2d234 | 797 | struct nfs4_client *clp = cb->cb_clp; |
8323c3b2 | 798 | u32 minorversion = clp->cl_minorversion; |
2a1d1b59 | 799 | |
fb003923 | 800 | cb->cb_minorversion = minorversion; |
2a1d1b59 | 801 | if (minorversion) { |
3ff3600e | 802 | if (!nfsd41_cb_get_slot(clp, task)) |
2a1d1b59 | 803 | return; |
2a1d1b59 | 804 | } |
5ce8ba25 | 805 | spin_lock(&clp->cl_lock); |
a8f2800b BF |
806 | if (list_empty(&cb->cb_per_client)) { |
807 | /* This is the first call, not a restart */ | |
808 | cb->cb_done = false; | |
809 | list_add(&cb->cb_per_client, &clp->cl_callbacks); | |
810 | } | |
5ce8ba25 | 811 | spin_unlock(&clp->cl_lock); |
2a1d1b59 RL |
812 | rpc_call_start(task); |
813 | } | |
814 | ||
0421b5c5 RL |
815 | static void nfsd4_cb_done(struct rpc_task *task, void *calldata) |
816 | { | |
5878453d | 817 | struct nfsd4_callback *cb = calldata; |
8be2d234 | 818 | struct nfs4_client *clp = cb->cb_clp; |
0421b5c5 RL |
819 | |
820 | dprintk("%s: minorversion=%d\n", __func__, | |
8323c3b2 | 821 | clp->cl_minorversion); |
0421b5c5 | 822 | |
8323c3b2 | 823 | if (clp->cl_minorversion) { |
0421b5c5 | 824 | /* No need for lock, access serialized in nfsd4_cb_prepare */ |
ac7c46f2 | 825 | ++clp->cl_cb_session->se_cb_seq_nr; |
0421b5c5 RL |
826 | clear_bit(0, &clp->cl_cb_slot_busy); |
827 | rpc_wake_up_next(&clp->cl_cb_waitq); | |
828 | dprintk("%s: freed slot, new seqid=%d\n", __func__, | |
ac7c46f2 | 829 | clp->cl_cb_session->se_cb_seq_nr); |
0421b5c5 RL |
830 | |
831 | /* We're done looking into the sequence information */ | |
832 | task->tk_msg.rpc_resp = NULL; | |
833 | } | |
834 | } | |
835 | ||
4b21d0de | 836 | |
63e4863f BF |
837 | static void nfsd4_cb_recall_done(struct rpc_task *task, void *calldata) |
838 | { | |
5878453d BF |
839 | struct nfsd4_callback *cb = calldata; |
840 | struct nfs4_delegation *dp = container_of(cb, struct nfs4_delegation, dl_recall); | |
8be2d234 | 841 | struct nfs4_client *clp = cb->cb_clp; |
4b21d0de | 842 | struct rpc_clnt *current_rpc_client = clp->cl_cb_client; |
63e4863f | 843 | |
0421b5c5 RL |
844 | nfsd4_cb_done(task, calldata); |
845 | ||
a8f2800b BF |
846 | if (current_rpc_client != task->tk_client) { |
847 | /* We're shutting down or changing cl_cb_client; leave | |
848 | * it to nfsd4_process_cb_update to restart the call if | |
849 | * necessary. */ | |
4b21d0de BF |
850 | return; |
851 | } | |
852 | ||
5ce8ba25 BF |
853 | if (cb->cb_done) |
854 | return; | |
63e4863f | 855 | switch (task->tk_status) { |
172c85dd | 856 | case 0: |
5ce8ba25 | 857 | cb->cb_done = true; |
172c85dd BF |
858 | return; |
859 | case -EBADHANDLE: | |
860 | case -NFS4ERR_BAD_STATEID: | |
861 | /* Race: client probably got cb_recall | |
862 | * before open reply granting delegation */ | |
863 | break; | |
864 | default: | |
63e4863f | 865 | /* Network partition? */ |
77a3569d | 866 | nfsd4_mark_cb_down(clp, task->tk_status); |
63e4863f BF |
867 | } |
868 | if (dp->dl_retries--) { | |
869 | rpc_delay(task, 2*HZ); | |
870 | task->tk_status = 0; | |
c18c821f | 871 | rpc_restart_call_prepare(task); |
0421b5c5 | 872 | return; |
63e4863f | 873 | } |
5ce8ba25 BF |
874 | nfsd4_mark_cb_down(clp, task->tk_status); |
875 | cb->cb_done = true; | |
63e4863f BF |
876 | } |
877 | ||
878 | static void nfsd4_cb_recall_release(void *calldata) | |
879 | { | |
5878453d | 880 | struct nfsd4_callback *cb = calldata; |
5ce8ba25 | 881 | struct nfs4_client *clp = cb->cb_clp; |
5878453d | 882 | struct nfs4_delegation *dp = container_of(cb, struct nfs4_delegation, dl_recall); |
63e4863f | 883 | |
5ce8ba25 BF |
884 | if (cb->cb_done) { |
885 | spin_lock(&clp->cl_lock); | |
886 | list_del(&cb->cb_per_client); | |
887 | spin_unlock(&clp->cl_lock); | |
888 | nfs4_put_delegation(dp); | |
889 | } | |
63e4863f BF |
890 | } |
891 | ||
892 | static const struct rpc_call_ops nfsd4_cb_recall_ops = { | |
2a1d1b59 | 893 | .rpc_call_prepare = nfsd4_cb_prepare, |
63e4863f BF |
894 | .rpc_call_done = nfsd4_cb_recall_done, |
895 | .rpc_release = nfsd4_cb_recall_release, | |
896 | }; | |
897 | ||
b5a1a81e BF |
898 | int nfsd4_create_callback_queue(void) |
899 | { | |
900 | callback_wq = create_singlethread_workqueue("nfsd4_callbacks"); | |
901 | if (!callback_wq) | |
902 | return -ENOMEM; | |
903 | return 0; | |
904 | } | |
905 | ||
906 | void nfsd4_destroy_callback_queue(void) | |
907 | { | |
908 | destroy_workqueue(callback_wq); | |
909 | } | |
910 | ||
ab707e15 | 911 | /* must be called under the state lock */ |
6ff8da08 | 912 | void nfsd4_shutdown_callback(struct nfs4_client *clp) |
b5a1a81e | 913 | { |
a52d726b | 914 | set_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags); |
b5a1a81e | 915 | /* |
6ff8da08 BF |
916 | * Note this won't actually result in a null callback; |
917 | * instead, nfsd4_do_callback_rpc() will detect the killed | |
918 | * client, destroy the rpc client, and stop: | |
b5a1a81e | 919 | */ |
6ff8da08 | 920 | do_probe_callback(clp); |
b5a1a81e | 921 | flush_workqueue(callback_wq); |
b5a1a81e BF |
922 | } |
923 | ||
65e4c894 | 924 | static void nfsd4_release_cb(struct nfsd4_callback *cb) |
1da177e4 | 925 | { |
5878453d BF |
926 | if (cb->cb_ops->rpc_release) |
927 | cb->cb_ops->rpc_release(cb); | |
928 | } | |
929 | ||
dcbeaa68 BF |
930 | /* requires cl_lock: */ |
931 | static struct nfsd4_conn * __nfsd4_find_backchannel(struct nfs4_client *clp) | |
932 | { | |
933 | struct nfsd4_session *s; | |
934 | struct nfsd4_conn *c; | |
935 | ||
936 | list_for_each_entry(s, &clp->cl_sessions, se_perclnt) { | |
937 | list_for_each_entry(c, &s->se_conns, cn_persession) { | |
938 | if (c->cn_flags & NFS4_CDFC4_BACK) | |
939 | return c; | |
940 | } | |
941 | } | |
942 | return NULL; | |
943 | } | |
944 | ||
65e4c894 | 945 | static void nfsd4_process_cb_update(struct nfsd4_callback *cb) |
6ff8da08 BF |
946 | { |
947 | struct nfs4_cb_conn conn; | |
948 | struct nfs4_client *clp = cb->cb_clp; | |
dcbeaa68 BF |
949 | struct nfsd4_session *ses = NULL; |
950 | struct nfsd4_conn *c; | |
6ff8da08 BF |
951 | int err; |
952 | ||
953 | /* | |
954 | * This is either an update, or the client dying; in either case, | |
955 | * kill the old client: | |
956 | */ | |
957 | if (clp->cl_cb_client) { | |
958 | rpc_shutdown_client(clp->cl_cb_client); | |
959 | clp->cl_cb_client = NULL; | |
c6bb3ca2 BF |
960 | put_rpccred(clp->cl_cb_cred); |
961 | clp->cl_cb_cred = NULL; | |
6ff8da08 | 962 | } |
dcbeaa68 BF |
963 | if (clp->cl_cb_conn.cb_xprt) { |
964 | svc_xprt_put(clp->cl_cb_conn.cb_xprt); | |
965 | clp->cl_cb_conn.cb_xprt = NULL; | |
966 | } | |
a52d726b | 967 | if (test_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags)) |
6ff8da08 BF |
968 | return; |
969 | spin_lock(&clp->cl_lock); | |
970 | /* | |
971 | * Only serialized callback code is allowed to clear these | |
972 | * flags; main nfsd code can only set them: | |
973 | */ | |
a52d726b JL |
974 | BUG_ON(!(clp->cl_flags & NFSD4_CLIENT_CB_FLAG_MASK)); |
975 | clear_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags); | |
6ff8da08 | 976 | memcpy(&conn, &cb->cb_clp->cl_cb_conn, sizeof(struct nfs4_cb_conn)); |
dcbeaa68 BF |
977 | c = __nfsd4_find_backchannel(clp); |
978 | if (c) { | |
979 | svc_xprt_get(c->cn_xprt); | |
980 | conn.cb_xprt = c->cn_xprt; | |
981 | ses = c->cn_session; | |
982 | } | |
6ff8da08 BF |
983 | spin_unlock(&clp->cl_lock); |
984 | ||
dcbeaa68 | 985 | err = setup_callback_client(clp, &conn, ses); |
5ce8ba25 | 986 | if (err) { |
8546ee51 | 987 | nfsd4_mark_cb_down(clp, err); |
5ce8ba25 BF |
988 | return; |
989 | } | |
990 | /* Yay, the callback channel's back! Restart any callbacks: */ | |
991 | list_for_each_entry(cb, &clp->cl_callbacks, cb_per_client) | |
992 | run_nfsd4_cb(cb); | |
6ff8da08 BF |
993 | } |
994 | ||
57725155 | 995 | static void nfsd4_do_callback_rpc(struct work_struct *w) |
5878453d BF |
996 | { |
997 | struct nfsd4_callback *cb = container_of(w, struct nfsd4_callback, cb_work); | |
fb003923 | 998 | struct nfs4_client *clp = cb->cb_clp; |
6ff8da08 | 999 | struct rpc_clnt *clnt; |
1da177e4 | 1000 | |
a52d726b | 1001 | if (clp->cl_flags & NFSD4_CLIENT_CB_FLAG_MASK) |
6ff8da08 BF |
1002 | nfsd4_process_cb_update(cb); |
1003 | ||
1004 | clnt = clp->cl_cb_client; | |
1005 | if (!clnt) { | |
1006 | /* Callback channel broken, or client killed; give up: */ | |
5878453d | 1007 | nfsd4_release_cb(cb); |
6ff8da08 | 1008 | return; |
ac94bf58 | 1009 | } |
c6bb3ca2 | 1010 | cb->cb_msg.rpc_cred = clp->cl_cb_cred; |
cee277d9 BF |
1011 | rpc_call_async(clnt, &cb->cb_msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN, |
1012 | cb->cb_ops, cb); | |
1da177e4 | 1013 | } |
b5a1a81e | 1014 | |
57725155 BF |
1015 | void nfsd4_init_callback(struct nfsd4_callback *cb) |
1016 | { | |
1017 | INIT_WORK(&cb->cb_work, nfsd4_do_callback_rpc); | |
1018 | } | |
1019 | ||
5878453d | 1020 | void nfsd4_cb_recall(struct nfs4_delegation *dp) |
b5a1a81e | 1021 | { |
5878453d | 1022 | struct nfsd4_callback *cb = &dp->dl_recall; |
2a74aba7 | 1023 | struct nfs4_client *clp = dp->dl_stid.sc_client; |
b5a1a81e | 1024 | |
5878453d | 1025 | dp->dl_retries = 1; |
fb003923 | 1026 | cb->cb_op = dp; |
5ce8ba25 | 1027 | cb->cb_clp = clp; |
5878453d | 1028 | cb->cb_msg.rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_RECALL]; |
fb003923 BF |
1029 | cb->cb_msg.rpc_argp = cb; |
1030 | cb->cb_msg.rpc_resp = cb; | |
5878453d BF |
1031 | |
1032 | cb->cb_ops = &nfsd4_cb_recall_ops; | |
b5a1a81e | 1033 | |
9ee1ba54 | 1034 | INIT_LIST_HEAD(&cb->cb_per_client); |
5ce8ba25 BF |
1035 | cb->cb_done = true; |
1036 | ||
229b2a08 | 1037 | run_nfsd4_cb(&dp->dl_recall); |
b5a1a81e | 1038 | } |