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Merge branch 'for-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/bluetoot...
[deliverable/linux.git] / fs / nfsd / nfs4callback.c
1 /*
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
34 #include <linux/sunrpc/clnt.h>
35 #include <linux/sunrpc/xprt.h>
36 #include <linux/sunrpc/svc_xprt.h>
37 #include <linux/slab.h>
38 #include "nfsd.h"
39 #include "state.h"
40 #include "netns.h"
41 #include "xdr4cb.h"
42
43 #define NFSDDBG_FACILITY NFSDDBG_PROC
44
45 static void nfsd4_mark_cb_fault(struct nfs4_client *, int reason);
46
47 #define NFSPROC4_CB_NULL 0
48 #define NFSPROC4_CB_COMPOUND 1
49
50 /* Index of predefined Linux callback client operations */
51
52 enum {
53 NFSPROC4_CLNT_CB_NULL = 0,
54 NFSPROC4_CLNT_CB_RECALL,
55 NFSPROC4_CLNT_CB_SEQUENCE,
56 };
57
58 struct nfs4_cb_compound_hdr {
59 /* args */
60 u32 ident; /* minorversion 0 only */
61 u32 nops;
62 __be32 *nops_p;
63 u32 minorversion;
64 /* res */
65 int status;
66 };
67
68 /*
69 * Handle decode buffer overflows out-of-line.
70 */
71 static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
72 {
73 dprintk("NFS: %s prematurely hit the end of our receive buffer. "
74 "Remaining buffer length is %tu words.\n",
75 func, xdr->end - xdr->p);
76 }
77
78 static __be32 *xdr_encode_empty_array(__be32 *p)
79 {
80 *p++ = xdr_zero;
81 return p;
82 }
83
84 /*
85 * Encode/decode NFSv4 CB basic data types
86 *
87 * Basic NFSv4 callback data types are defined in section 15 of RFC
88 * 3530: "Network File System (NFS) version 4 Protocol" and section
89 * 20 of RFC 5661: "Network File System (NFS) Version 4 Minor Version
90 * 1 Protocol"
91 */
92
93 /*
94 * nfs_cb_opnum4
95 *
96 * enum nfs_cb_opnum4 {
97 * OP_CB_GETATTR = 3,
98 * ...
99 * };
100 */
101 enum nfs_cb_opnum4 {
102 OP_CB_GETATTR = 3,
103 OP_CB_RECALL = 4,
104 OP_CB_LAYOUTRECALL = 5,
105 OP_CB_NOTIFY = 6,
106 OP_CB_PUSH_DELEG = 7,
107 OP_CB_RECALL_ANY = 8,
108 OP_CB_RECALLABLE_OBJ_AVAIL = 9,
109 OP_CB_RECALL_SLOT = 10,
110 OP_CB_SEQUENCE = 11,
111 OP_CB_WANTS_CANCELLED = 12,
112 OP_CB_NOTIFY_LOCK = 13,
113 OP_CB_NOTIFY_DEVICEID = 14,
114 OP_CB_ILLEGAL = 10044
115 };
116
117 static void encode_nfs_cb_opnum4(struct xdr_stream *xdr, enum nfs_cb_opnum4 op)
118 {
119 __be32 *p;
120
121 p = xdr_reserve_space(xdr, 4);
122 *p = cpu_to_be32(op);
123 }
124
125 /*
126 * nfs_fh4
127 *
128 * typedef opaque nfs_fh4<NFS4_FHSIZE>;
129 */
130 static void encode_nfs_fh4(struct xdr_stream *xdr, const struct knfsd_fh *fh)
131 {
132 u32 length = fh->fh_size;
133 __be32 *p;
134
135 BUG_ON(length > NFS4_FHSIZE);
136 p = xdr_reserve_space(xdr, 4 + length);
137 xdr_encode_opaque(p, &fh->fh_base, length);
138 }
139
140 /*
141 * stateid4
142 *
143 * struct stateid4 {
144 * uint32_t seqid;
145 * opaque other[12];
146 * };
147 */
148 static void encode_stateid4(struct xdr_stream *xdr, const stateid_t *sid)
149 {
150 __be32 *p;
151
152 p = xdr_reserve_space(xdr, NFS4_STATEID_SIZE);
153 *p++ = cpu_to_be32(sid->si_generation);
154 xdr_encode_opaque_fixed(p, &sid->si_opaque, NFS4_STATEID_OTHER_SIZE);
155 }
156
157 /*
158 * sessionid4
159 *
160 * typedef opaque sessionid4[NFS4_SESSIONID_SIZE];
161 */
162 static void encode_sessionid4(struct xdr_stream *xdr,
163 const struct nfsd4_session *session)
164 {
165 __be32 *p;
166
167 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN);
168 xdr_encode_opaque_fixed(p, session->se_sessionid.data,
169 NFS4_MAX_SESSIONID_LEN);
170 }
171
172 /*
173 * nfsstat4
174 */
175 static const struct {
176 int stat;
177 int errno;
178 } nfs_cb_errtbl[] = {
179 { NFS4_OK, 0 },
180 { NFS4ERR_PERM, -EPERM },
181 { NFS4ERR_NOENT, -ENOENT },
182 { NFS4ERR_IO, -EIO },
183 { NFS4ERR_NXIO, -ENXIO },
184 { NFS4ERR_ACCESS, -EACCES },
185 { NFS4ERR_EXIST, -EEXIST },
186 { NFS4ERR_XDEV, -EXDEV },
187 { NFS4ERR_NOTDIR, -ENOTDIR },
188 { NFS4ERR_ISDIR, -EISDIR },
189 { NFS4ERR_INVAL, -EINVAL },
190 { NFS4ERR_FBIG, -EFBIG },
191 { NFS4ERR_NOSPC, -ENOSPC },
192 { NFS4ERR_ROFS, -EROFS },
193 { NFS4ERR_MLINK, -EMLINK },
194 { NFS4ERR_NAMETOOLONG, -ENAMETOOLONG },
195 { NFS4ERR_NOTEMPTY, -ENOTEMPTY },
196 { NFS4ERR_DQUOT, -EDQUOT },
197 { NFS4ERR_STALE, -ESTALE },
198 { NFS4ERR_BADHANDLE, -EBADHANDLE },
199 { NFS4ERR_BAD_COOKIE, -EBADCOOKIE },
200 { NFS4ERR_NOTSUPP, -ENOTSUPP },
201 { NFS4ERR_TOOSMALL, -ETOOSMALL },
202 { NFS4ERR_SERVERFAULT, -ESERVERFAULT },
203 { NFS4ERR_BADTYPE, -EBADTYPE },
204 { NFS4ERR_LOCKED, -EAGAIN },
205 { NFS4ERR_RESOURCE, -EREMOTEIO },
206 { NFS4ERR_SYMLINK, -ELOOP },
207 { NFS4ERR_OP_ILLEGAL, -EOPNOTSUPP },
208 { NFS4ERR_DEADLOCK, -EDEADLK },
209 { -1, -EIO }
210 };
211
212 /*
213 * If we cannot translate the error, the recovery routines should
214 * handle it.
215 *
216 * Note: remaining NFSv4 error codes have values > 10000, so should
217 * not conflict with native Linux error codes.
218 */
219 static int nfs_cb_stat_to_errno(int status)
220 {
221 int i;
222
223 for (i = 0; nfs_cb_errtbl[i].stat != -1; i++) {
224 if (nfs_cb_errtbl[i].stat == status)
225 return nfs_cb_errtbl[i].errno;
226 }
227
228 dprintk("NFSD: Unrecognized NFS CB status value: %u\n", status);
229 return -status;
230 }
231
232 static int decode_cb_op_status(struct xdr_stream *xdr, enum nfs_opnum4 expected,
233 enum nfsstat4 *status)
234 {
235 __be32 *p;
236 u32 op;
237
238 p = xdr_inline_decode(xdr, 4 + 4);
239 if (unlikely(p == NULL))
240 goto out_overflow;
241 op = be32_to_cpup(p++);
242 if (unlikely(op != expected))
243 goto out_unexpected;
244 *status = be32_to_cpup(p);
245 return 0;
246 out_overflow:
247 print_overflow_msg(__func__, xdr);
248 return -EIO;
249 out_unexpected:
250 dprintk("NFSD: Callback server returned operation %d but "
251 "we issued a request for %d\n", op, expected);
252 return -EIO;
253 }
254
255 /*
256 * CB_COMPOUND4args
257 *
258 * struct CB_COMPOUND4args {
259 * utf8str_cs tag;
260 * uint32_t minorversion;
261 * uint32_t callback_ident;
262 * nfs_cb_argop4 argarray<>;
263 * };
264 */
265 static void encode_cb_compound4args(struct xdr_stream *xdr,
266 struct nfs4_cb_compound_hdr *hdr)
267 {
268 __be32 * p;
269
270 p = xdr_reserve_space(xdr, 4 + 4 + 4 + 4);
271 p = xdr_encode_empty_array(p); /* empty tag */
272 *p++ = cpu_to_be32(hdr->minorversion);
273 *p++ = cpu_to_be32(hdr->ident);
274
275 hdr->nops_p = p;
276 *p = cpu_to_be32(hdr->nops); /* argarray element count */
277 }
278
279 /*
280 * Update argarray element count
281 */
282 static void encode_cb_nops(struct nfs4_cb_compound_hdr *hdr)
283 {
284 BUG_ON(hdr->nops > NFS4_MAX_BACK_CHANNEL_OPS);
285 *hdr->nops_p = cpu_to_be32(hdr->nops);
286 }
287
288 /*
289 * CB_COMPOUND4res
290 *
291 * struct CB_COMPOUND4res {
292 * nfsstat4 status;
293 * utf8str_cs tag;
294 * nfs_cb_resop4 resarray<>;
295 * };
296 */
297 static int decode_cb_compound4res(struct xdr_stream *xdr,
298 struct nfs4_cb_compound_hdr *hdr)
299 {
300 u32 length;
301 __be32 *p;
302
303 p = xdr_inline_decode(xdr, 4 + 4);
304 if (unlikely(p == NULL))
305 goto out_overflow;
306 hdr->status = be32_to_cpup(p++);
307 /* Ignore the tag */
308 length = be32_to_cpup(p++);
309 p = xdr_inline_decode(xdr, length + 4);
310 if (unlikely(p == NULL))
311 goto out_overflow;
312 hdr->nops = be32_to_cpup(p);
313 return 0;
314 out_overflow:
315 print_overflow_msg(__func__, xdr);
316 return -EIO;
317 }
318
319 /*
320 * CB_RECALL4args
321 *
322 * struct CB_RECALL4args {
323 * stateid4 stateid;
324 * bool truncate;
325 * nfs_fh4 fh;
326 * };
327 */
328 static void encode_cb_recall4args(struct xdr_stream *xdr,
329 const struct nfs4_delegation *dp,
330 struct nfs4_cb_compound_hdr *hdr)
331 {
332 __be32 *p;
333
334 encode_nfs_cb_opnum4(xdr, OP_CB_RECALL);
335 encode_stateid4(xdr, &dp->dl_stid.sc_stateid);
336
337 p = xdr_reserve_space(xdr, 4);
338 *p++ = xdr_zero; /* truncate */
339
340 encode_nfs_fh4(xdr, &dp->dl_fh);
341
342 hdr->nops++;
343 }
344
345 /*
346 * CB_SEQUENCE4args
347 *
348 * struct CB_SEQUENCE4args {
349 * sessionid4 csa_sessionid;
350 * sequenceid4 csa_sequenceid;
351 * slotid4 csa_slotid;
352 * slotid4 csa_highest_slotid;
353 * bool csa_cachethis;
354 * referring_call_list4 csa_referring_call_lists<>;
355 * };
356 */
357 static void encode_cb_sequence4args(struct xdr_stream *xdr,
358 const struct nfsd4_callback *cb,
359 struct nfs4_cb_compound_hdr *hdr)
360 {
361 struct nfsd4_session *session = cb->cb_clp->cl_cb_session;
362 __be32 *p;
363
364 if (hdr->minorversion == 0)
365 return;
366
367 encode_nfs_cb_opnum4(xdr, OP_CB_SEQUENCE);
368 encode_sessionid4(xdr, session);
369
370 p = xdr_reserve_space(xdr, 4 + 4 + 4 + 4 + 4);
371 *p++ = cpu_to_be32(session->se_cb_seq_nr); /* csa_sequenceid */
372 *p++ = xdr_zero; /* csa_slotid */
373 *p++ = xdr_zero; /* csa_highest_slotid */
374 *p++ = xdr_zero; /* csa_cachethis */
375 xdr_encode_empty_array(p); /* csa_referring_call_lists */
376
377 hdr->nops++;
378 }
379
380 /*
381 * CB_SEQUENCE4resok
382 *
383 * struct CB_SEQUENCE4resok {
384 * sessionid4 csr_sessionid;
385 * sequenceid4 csr_sequenceid;
386 * slotid4 csr_slotid;
387 * slotid4 csr_highest_slotid;
388 * slotid4 csr_target_highest_slotid;
389 * };
390 *
391 * union CB_SEQUENCE4res switch (nfsstat4 csr_status) {
392 * case NFS4_OK:
393 * CB_SEQUENCE4resok csr_resok4;
394 * default:
395 * void;
396 * };
397 *
398 * Our current back channel implmentation supports a single backchannel
399 * with a single slot.
400 */
401 static int decode_cb_sequence4resok(struct xdr_stream *xdr,
402 struct nfsd4_callback *cb)
403 {
404 struct nfsd4_session *session = cb->cb_clp->cl_cb_session;
405 struct nfs4_sessionid id;
406 int status;
407 __be32 *p;
408 u32 dummy;
409
410 status = -ESERVERFAULT;
411
412 /*
413 * If the server returns different values for sessionID, slotID or
414 * sequence number, the server is looney tunes.
415 */
416 p = xdr_inline_decode(xdr, NFS4_MAX_SESSIONID_LEN + 4 + 4 + 4 + 4);
417 if (unlikely(p == NULL))
418 goto out_overflow;
419 memcpy(id.data, p, NFS4_MAX_SESSIONID_LEN);
420 if (memcmp(id.data, session->se_sessionid.data,
421 NFS4_MAX_SESSIONID_LEN) != 0) {
422 dprintk("NFS: %s Invalid session id\n", __func__);
423 goto out;
424 }
425 p += XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN);
426
427 dummy = be32_to_cpup(p++);
428 if (dummy != session->se_cb_seq_nr) {
429 dprintk("NFS: %s Invalid sequence number\n", __func__);
430 goto out;
431 }
432
433 dummy = be32_to_cpup(p++);
434 if (dummy != 0) {
435 dprintk("NFS: %s Invalid slotid\n", __func__);
436 goto out;
437 }
438
439 /*
440 * FIXME: process highest slotid and target highest slotid
441 */
442 status = 0;
443 out:
444 if (status)
445 nfsd4_mark_cb_fault(cb->cb_clp, status);
446 return status;
447 out_overflow:
448 print_overflow_msg(__func__, xdr);
449 return -EIO;
450 }
451
452 static int decode_cb_sequence4res(struct xdr_stream *xdr,
453 struct nfsd4_callback *cb)
454 {
455 enum nfsstat4 nfserr;
456 int status;
457
458 if (cb->cb_minorversion == 0)
459 return 0;
460
461 status = decode_cb_op_status(xdr, OP_CB_SEQUENCE, &nfserr);
462 if (unlikely(status))
463 goto out;
464 if (unlikely(nfserr != NFS4_OK))
465 goto out_default;
466 status = decode_cb_sequence4resok(xdr, cb);
467 out:
468 return status;
469 out_default:
470 return nfs_cb_stat_to_errno(nfserr);
471 }
472
473 /*
474 * NFSv4.0 and NFSv4.1 XDR encode functions
475 *
476 * NFSv4.0 callback argument types are defined in section 15 of RFC
477 * 3530: "Network File System (NFS) version 4 Protocol" and section 20
478 * of RFC 5661: "Network File System (NFS) Version 4 Minor Version 1
479 * Protocol".
480 */
481
482 /*
483 * NB: Without this zero space reservation, callbacks over krb5p fail
484 */
485 static void nfs4_xdr_enc_cb_null(struct rpc_rqst *req, struct xdr_stream *xdr,
486 void *__unused)
487 {
488 xdr_reserve_space(xdr, 0);
489 }
490
491 /*
492 * 20.2. Operation 4: CB_RECALL - Recall a Delegation
493 */
494 static void nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, struct xdr_stream *xdr,
495 const struct nfsd4_callback *cb)
496 {
497 const struct nfs4_delegation *args = cb->cb_op;
498 struct nfs4_cb_compound_hdr hdr = {
499 .ident = cb->cb_clp->cl_cb_ident,
500 .minorversion = cb->cb_minorversion,
501 };
502
503 encode_cb_compound4args(xdr, &hdr);
504 encode_cb_sequence4args(xdr, cb, &hdr);
505 encode_cb_recall4args(xdr, args, &hdr);
506 encode_cb_nops(&hdr);
507 }
508
509
510 /*
511 * NFSv4.0 and NFSv4.1 XDR decode functions
512 *
513 * NFSv4.0 callback result types are defined in section 15 of RFC
514 * 3530: "Network File System (NFS) version 4 Protocol" and section 20
515 * of RFC 5661: "Network File System (NFS) Version 4 Minor Version 1
516 * Protocol".
517 */
518
519 static int nfs4_xdr_dec_cb_null(struct rpc_rqst *req, struct xdr_stream *xdr,
520 void *__unused)
521 {
522 return 0;
523 }
524
525 /*
526 * 20.2. Operation 4: CB_RECALL - Recall a Delegation
527 */
528 static int nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp,
529 struct xdr_stream *xdr,
530 struct nfsd4_callback *cb)
531 {
532 struct nfs4_cb_compound_hdr hdr;
533 enum nfsstat4 nfserr;
534 int status;
535
536 status = decode_cb_compound4res(xdr, &hdr);
537 if (unlikely(status))
538 goto out;
539
540 if (cb != NULL) {
541 status = decode_cb_sequence4res(xdr, cb);
542 if (unlikely(status))
543 goto out;
544 }
545
546 status = decode_cb_op_status(xdr, OP_CB_RECALL, &nfserr);
547 if (unlikely(status))
548 goto out;
549 if (unlikely(nfserr != NFS4_OK))
550 status = nfs_cb_stat_to_errno(nfserr);
551 out:
552 return status;
553 }
554
555 /*
556 * RPC procedure tables
557 */
558 #define PROC(proc, call, argtype, restype) \
559 [NFSPROC4_CLNT_##proc] = { \
560 .p_proc = NFSPROC4_CB_##call, \
561 .p_encode = (kxdreproc_t)nfs4_xdr_enc_##argtype, \
562 .p_decode = (kxdrdproc_t)nfs4_xdr_dec_##restype, \
563 .p_arglen = NFS4_enc_##argtype##_sz, \
564 .p_replen = NFS4_dec_##restype##_sz, \
565 .p_statidx = NFSPROC4_CB_##call, \
566 .p_name = #proc, \
567 }
568
569 static struct rpc_procinfo nfs4_cb_procedures[] = {
570 PROC(CB_NULL, NULL, cb_null, cb_null),
571 PROC(CB_RECALL, COMPOUND, cb_recall, cb_recall),
572 };
573
574 static struct rpc_version nfs_cb_version4 = {
575 /*
576 * Note on the callback rpc program version number: despite language in rfc
577 * 5661 section 18.36.3 requiring servers to use 4 in this field, the
578 * official xdr descriptions for both 4.0 and 4.1 specify version 1, and
579 * in practice that appears to be what implementations use. The section
580 * 18.36.3 language is expected to be fixed in an erratum.
581 */
582 .number = 1,
583 .nrprocs = ARRAY_SIZE(nfs4_cb_procedures),
584 .procs = nfs4_cb_procedures
585 };
586
587 static const struct rpc_version *nfs_cb_version[] = {
588 &nfs_cb_version4,
589 };
590
591 static const struct rpc_program cb_program;
592
593 static struct rpc_stat cb_stats = {
594 .program = &cb_program
595 };
596
597 #define NFS4_CALLBACK 0x40000000
598 static const struct rpc_program cb_program = {
599 .name = "nfs4_cb",
600 .number = NFS4_CALLBACK,
601 .nrvers = ARRAY_SIZE(nfs_cb_version),
602 .version = nfs_cb_version,
603 .stats = &cb_stats,
604 .pipe_dir_name = "nfsd4_cb",
605 };
606
607 static int max_cb_time(struct net *net)
608 {
609 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
610 return max(nn->nfsd4_lease/10, (time_t)1) * HZ;
611 }
612
613 static struct rpc_cred *callback_cred;
614
615 int set_callback_cred(void)
616 {
617 if (callback_cred)
618 return 0;
619 callback_cred = rpc_lookup_machine_cred("nfs");
620 if (!callback_cred)
621 return -ENOMEM;
622 return 0;
623 }
624
625 static struct rpc_cred *get_backchannel_cred(struct nfs4_client *clp, struct rpc_clnt *client, struct nfsd4_session *ses)
626 {
627 if (clp->cl_minorversion == 0) {
628 return get_rpccred(callback_cred);
629 } else {
630 struct rpc_auth *auth = client->cl_auth;
631 struct auth_cred acred = {};
632
633 acred.uid = ses->se_cb_sec.uid;
634 acred.gid = ses->se_cb_sec.gid;
635 return auth->au_ops->lookup_cred(client->cl_auth, &acred, 0);
636 }
637 }
638
639 static struct rpc_clnt *create_backchannel_client(struct rpc_create_args *args)
640 {
641 struct rpc_xprt *xprt;
642
643 if (args->protocol != XPRT_TRANSPORT_BC_TCP)
644 return rpc_create(args);
645
646 xprt = args->bc_xprt->xpt_bc_xprt;
647 if (xprt) {
648 xprt_get(xprt);
649 return rpc_create_xprt(args, xprt);
650 }
651
652 return rpc_create(args);
653 }
654
655 static int setup_callback_client(struct nfs4_client *clp, struct nfs4_cb_conn *conn, struct nfsd4_session *ses)
656 {
657 struct rpc_timeout timeparms = {
658 .to_initval = max_cb_time(clp->net),
659 .to_retries = 0,
660 };
661 struct rpc_create_args args = {
662 .net = clp->net,
663 .address = (struct sockaddr *) &conn->cb_addr,
664 .addrsize = conn->cb_addrlen,
665 .saddress = (struct sockaddr *) &conn->cb_saddr,
666 .timeout = &timeparms,
667 .program = &cb_program,
668 .version = 0,
669 .flags = (RPC_CLNT_CREATE_NOPING | RPC_CLNT_CREATE_QUIET),
670 };
671 struct rpc_clnt *client;
672 struct rpc_cred *cred;
673
674 if (clp->cl_minorversion == 0) {
675 if (!clp->cl_cred.cr_principal &&
676 (clp->cl_cred.cr_flavor >= RPC_AUTH_GSS_KRB5))
677 return -EINVAL;
678 args.client_name = clp->cl_cred.cr_principal;
679 args.prognumber = conn->cb_prog,
680 args.protocol = XPRT_TRANSPORT_TCP;
681 args.authflavor = clp->cl_cred.cr_flavor;
682 clp->cl_cb_ident = conn->cb_ident;
683 } else {
684 if (!conn->cb_xprt)
685 return -EINVAL;
686 clp->cl_cb_conn.cb_xprt = conn->cb_xprt;
687 clp->cl_cb_session = ses;
688 args.bc_xprt = conn->cb_xprt;
689 args.prognumber = clp->cl_cb_session->se_cb_prog;
690 args.protocol = XPRT_TRANSPORT_BC_TCP;
691 args.authflavor = ses->se_cb_sec.flavor;
692 }
693 /* Create RPC client */
694 client = create_backchannel_client(&args);
695 if (IS_ERR(client)) {
696 dprintk("NFSD: couldn't create callback client: %ld\n",
697 PTR_ERR(client));
698 return PTR_ERR(client);
699 }
700 cred = get_backchannel_cred(clp, client, ses);
701 if (IS_ERR(cred)) {
702 rpc_shutdown_client(client);
703 return PTR_ERR(cred);
704 }
705 clp->cl_cb_client = client;
706 clp->cl_cb_cred = cred;
707 return 0;
708 }
709
710 static void warn_no_callback_path(struct nfs4_client *clp, int reason)
711 {
712 dprintk("NFSD: warning: no callback path to client %.*s: error %d\n",
713 (int)clp->cl_name.len, clp->cl_name.data, reason);
714 }
715
716 static void nfsd4_mark_cb_down(struct nfs4_client *clp, int reason)
717 {
718 clp->cl_cb_state = NFSD4_CB_DOWN;
719 warn_no_callback_path(clp, reason);
720 }
721
722 static void nfsd4_mark_cb_fault(struct nfs4_client *clp, int reason)
723 {
724 clp->cl_cb_state = NFSD4_CB_FAULT;
725 warn_no_callback_path(clp, reason);
726 }
727
728 static void nfsd4_cb_probe_done(struct rpc_task *task, void *calldata)
729 {
730 struct nfs4_client *clp = container_of(calldata, struct nfs4_client, cl_cb_null);
731
732 if (task->tk_status)
733 nfsd4_mark_cb_down(clp, task->tk_status);
734 else
735 clp->cl_cb_state = NFSD4_CB_UP;
736 }
737
738 static const struct rpc_call_ops nfsd4_cb_probe_ops = {
739 /* XXX: release method to ensure we set the cb channel down if
740 * necessary on early failure? */
741 .rpc_call_done = nfsd4_cb_probe_done,
742 };
743
744 static struct workqueue_struct *callback_wq;
745
746 static void run_nfsd4_cb(struct nfsd4_callback *cb)
747 {
748 queue_work(callback_wq, &cb->cb_work);
749 }
750
751 static void do_probe_callback(struct nfs4_client *clp)
752 {
753 struct nfsd4_callback *cb = &clp->cl_cb_null;
754
755 cb->cb_op = NULL;
756 cb->cb_clp = clp;
757
758 cb->cb_msg.rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_NULL];
759 cb->cb_msg.rpc_argp = NULL;
760 cb->cb_msg.rpc_resp = NULL;
761
762 cb->cb_ops = &nfsd4_cb_probe_ops;
763
764 run_nfsd4_cb(cb);
765 }
766
767 /*
768 * Poke the callback thread to process any updates to the callback
769 * parameters, and send a null probe.
770 */
771 void nfsd4_probe_callback(struct nfs4_client *clp)
772 {
773 clp->cl_cb_state = NFSD4_CB_UNKNOWN;
774 set_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags);
775 do_probe_callback(clp);
776 }
777
778 void nfsd4_probe_callback_sync(struct nfs4_client *clp)
779 {
780 nfsd4_probe_callback(clp);
781 flush_workqueue(callback_wq);
782 }
783
784 void nfsd4_change_callback(struct nfs4_client *clp, struct nfs4_cb_conn *conn)
785 {
786 clp->cl_cb_state = NFSD4_CB_UNKNOWN;
787 spin_lock(&clp->cl_lock);
788 memcpy(&clp->cl_cb_conn, conn, sizeof(struct nfs4_cb_conn));
789 spin_unlock(&clp->cl_lock);
790 }
791
792 /*
793 * There's currently a single callback channel slot.
794 * If the slot is available, then mark it busy. Otherwise, set the
795 * thread for sleeping on the callback RPC wait queue.
796 */
797 static bool nfsd41_cb_get_slot(struct nfs4_client *clp, struct rpc_task *task)
798 {
799 if (test_and_set_bit(0, &clp->cl_cb_slot_busy) != 0) {
800 rpc_sleep_on(&clp->cl_cb_waitq, task, NULL);
801 dprintk("%s slot is busy\n", __func__);
802 return false;
803 }
804 return true;
805 }
806
807 /*
808 * TODO: cb_sequence should support referring call lists, cachethis, multiple
809 * slots, and mark callback channel down on communication errors.
810 */
811 static void nfsd4_cb_prepare(struct rpc_task *task, void *calldata)
812 {
813 struct nfsd4_callback *cb = calldata;
814 struct nfs4_client *clp = cb->cb_clp;
815 u32 minorversion = clp->cl_minorversion;
816
817 cb->cb_minorversion = minorversion;
818 if (minorversion) {
819 if (!nfsd41_cb_get_slot(clp, task))
820 return;
821 }
822 spin_lock(&clp->cl_lock);
823 if (list_empty(&cb->cb_per_client)) {
824 /* This is the first call, not a restart */
825 cb->cb_done = false;
826 list_add(&cb->cb_per_client, &clp->cl_callbacks);
827 }
828 spin_unlock(&clp->cl_lock);
829 rpc_call_start(task);
830 }
831
832 static void nfsd4_cb_done(struct rpc_task *task, void *calldata)
833 {
834 struct nfsd4_callback *cb = calldata;
835 struct nfs4_client *clp = cb->cb_clp;
836
837 dprintk("%s: minorversion=%d\n", __func__,
838 clp->cl_minorversion);
839
840 if (clp->cl_minorversion) {
841 /* No need for lock, access serialized in nfsd4_cb_prepare */
842 ++clp->cl_cb_session->se_cb_seq_nr;
843 clear_bit(0, &clp->cl_cb_slot_busy);
844 rpc_wake_up_next(&clp->cl_cb_waitq);
845 dprintk("%s: freed slot, new seqid=%d\n", __func__,
846 clp->cl_cb_session->se_cb_seq_nr);
847
848 /* We're done looking into the sequence information */
849 task->tk_msg.rpc_resp = NULL;
850 }
851 }
852
853
854 static void nfsd4_cb_recall_done(struct rpc_task *task, void *calldata)
855 {
856 struct nfsd4_callback *cb = calldata;
857 struct nfs4_delegation *dp = container_of(cb, struct nfs4_delegation, dl_recall);
858 struct nfs4_client *clp = cb->cb_clp;
859 struct rpc_clnt *current_rpc_client = clp->cl_cb_client;
860
861 nfsd4_cb_done(task, calldata);
862
863 if (current_rpc_client != task->tk_client) {
864 /* We're shutting down or changing cl_cb_client; leave
865 * it to nfsd4_process_cb_update to restart the call if
866 * necessary. */
867 return;
868 }
869
870 if (cb->cb_done)
871 return;
872 switch (task->tk_status) {
873 case 0:
874 cb->cb_done = true;
875 return;
876 case -EBADHANDLE:
877 case -NFS4ERR_BAD_STATEID:
878 /* Race: client probably got cb_recall
879 * before open reply granting delegation */
880 break;
881 default:
882 /* Network partition? */
883 nfsd4_mark_cb_down(clp, task->tk_status);
884 }
885 if (dp->dl_retries--) {
886 rpc_delay(task, 2*HZ);
887 task->tk_status = 0;
888 rpc_restart_call_prepare(task);
889 return;
890 }
891 nfsd4_mark_cb_down(clp, task->tk_status);
892 cb->cb_done = true;
893 }
894
895 static void nfsd4_cb_recall_release(void *calldata)
896 {
897 struct nfsd4_callback *cb = calldata;
898 struct nfs4_client *clp = cb->cb_clp;
899 struct nfs4_delegation *dp = container_of(cb, struct nfs4_delegation, dl_recall);
900
901 if (cb->cb_done) {
902 spin_lock(&clp->cl_lock);
903 list_del(&cb->cb_per_client);
904 spin_unlock(&clp->cl_lock);
905 nfs4_put_delegation(dp);
906 }
907 }
908
909 static const struct rpc_call_ops nfsd4_cb_recall_ops = {
910 .rpc_call_prepare = nfsd4_cb_prepare,
911 .rpc_call_done = nfsd4_cb_recall_done,
912 .rpc_release = nfsd4_cb_recall_release,
913 };
914
915 int nfsd4_create_callback_queue(void)
916 {
917 callback_wq = create_singlethread_workqueue("nfsd4_callbacks");
918 if (!callback_wq)
919 return -ENOMEM;
920 return 0;
921 }
922
923 void nfsd4_destroy_callback_queue(void)
924 {
925 destroy_workqueue(callback_wq);
926 }
927
928 /* must be called under the state lock */
929 void nfsd4_shutdown_callback(struct nfs4_client *clp)
930 {
931 set_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags);
932 /*
933 * Note this won't actually result in a null callback;
934 * instead, nfsd4_do_callback_rpc() will detect the killed
935 * client, destroy the rpc client, and stop:
936 */
937 do_probe_callback(clp);
938 flush_workqueue(callback_wq);
939 }
940
941 static void nfsd4_release_cb(struct nfsd4_callback *cb)
942 {
943 if (cb->cb_ops->rpc_release)
944 cb->cb_ops->rpc_release(cb);
945 }
946
947 /* requires cl_lock: */
948 static struct nfsd4_conn * __nfsd4_find_backchannel(struct nfs4_client *clp)
949 {
950 struct nfsd4_session *s;
951 struct nfsd4_conn *c;
952
953 list_for_each_entry(s, &clp->cl_sessions, se_perclnt) {
954 list_for_each_entry(c, &s->se_conns, cn_persession) {
955 if (c->cn_flags & NFS4_CDFC4_BACK)
956 return c;
957 }
958 }
959 return NULL;
960 }
961
962 static void nfsd4_process_cb_update(struct nfsd4_callback *cb)
963 {
964 struct nfs4_cb_conn conn;
965 struct nfs4_client *clp = cb->cb_clp;
966 struct nfsd4_session *ses = NULL;
967 struct nfsd4_conn *c;
968 int err;
969
970 /*
971 * This is either an update, or the client dying; in either case,
972 * kill the old client:
973 */
974 if (clp->cl_cb_client) {
975 rpc_shutdown_client(clp->cl_cb_client);
976 clp->cl_cb_client = NULL;
977 put_rpccred(clp->cl_cb_cred);
978 clp->cl_cb_cred = NULL;
979 }
980 if (clp->cl_cb_conn.cb_xprt) {
981 svc_xprt_put(clp->cl_cb_conn.cb_xprt);
982 clp->cl_cb_conn.cb_xprt = NULL;
983 }
984 if (test_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags))
985 return;
986 spin_lock(&clp->cl_lock);
987 /*
988 * Only serialized callback code is allowed to clear these
989 * flags; main nfsd code can only set them:
990 */
991 BUG_ON(!(clp->cl_flags & NFSD4_CLIENT_CB_FLAG_MASK));
992 clear_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags);
993 memcpy(&conn, &cb->cb_clp->cl_cb_conn, sizeof(struct nfs4_cb_conn));
994 c = __nfsd4_find_backchannel(clp);
995 if (c) {
996 svc_xprt_get(c->cn_xprt);
997 conn.cb_xprt = c->cn_xprt;
998 ses = c->cn_session;
999 }
1000 spin_unlock(&clp->cl_lock);
1001
1002 err = setup_callback_client(clp, &conn, ses);
1003 if (err) {
1004 nfsd4_mark_cb_down(clp, err);
1005 return;
1006 }
1007 /* Yay, the callback channel's back! Restart any callbacks: */
1008 list_for_each_entry(cb, &clp->cl_callbacks, cb_per_client)
1009 run_nfsd4_cb(cb);
1010 }
1011
1012 static void nfsd4_do_callback_rpc(struct work_struct *w)
1013 {
1014 struct nfsd4_callback *cb = container_of(w, struct nfsd4_callback, cb_work);
1015 struct nfs4_client *clp = cb->cb_clp;
1016 struct rpc_clnt *clnt;
1017
1018 if (clp->cl_flags & NFSD4_CLIENT_CB_FLAG_MASK)
1019 nfsd4_process_cb_update(cb);
1020
1021 clnt = clp->cl_cb_client;
1022 if (!clnt) {
1023 /* Callback channel broken, or client killed; give up: */
1024 nfsd4_release_cb(cb);
1025 return;
1026 }
1027 cb->cb_msg.rpc_cred = clp->cl_cb_cred;
1028 rpc_call_async(clnt, &cb->cb_msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN,
1029 cb->cb_ops, cb);
1030 }
1031
1032 void nfsd4_init_callback(struct nfsd4_callback *cb)
1033 {
1034 INIT_WORK(&cb->cb_work, nfsd4_do_callback_rpc);
1035 }
1036
1037 void nfsd4_cb_recall(struct nfs4_delegation *dp)
1038 {
1039 struct nfsd4_callback *cb = &dp->dl_recall;
1040 struct nfs4_client *clp = dp->dl_stid.sc_client;
1041
1042 dp->dl_retries = 1;
1043 cb->cb_op = dp;
1044 cb->cb_clp = clp;
1045 cb->cb_msg.rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_RECALL];
1046 cb->cb_msg.rpc_argp = cb;
1047 cb->cb_msg.rpc_resp = cb;
1048
1049 cb->cb_ops = &nfsd4_cb_recall_ops;
1050
1051 INIT_LIST_HEAD(&cb->cb_per_client);
1052 cb->cb_done = true;
1053
1054 run_nfsd4_cb(&dp->dl_recall);
1055 }
Linux kernel - Deliverables
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