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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#include "xdr4.h"
43
44#define NFSDDBG_FACILITY NFSDDBG_PROC
45
46static void nfsd4_mark_cb_fault(struct nfs4_client *, int reason);
47
48#define NFSPROC4_CB_NULL 0
49#define NFSPROC4_CB_COMPOUND 1
50
51
52
53struct nfs4_cb_compound_hdr {
54
55 u32 ident;
56 u32 nops;
57 __be32 *nops_p;
58 u32 minorversion;
59
60 int status;
61};
62
63static __be32 *xdr_encode_empty_array(__be32 *p)
64{
65 *p++ = xdr_zero;
66 return p;
67}
68
69
70
71
72
73
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85
86enum nfs_cb_opnum4 {
87 OP_CB_GETATTR = 3,
88 OP_CB_RECALL = 4,
89 OP_CB_LAYOUTRECALL = 5,
90 OP_CB_NOTIFY = 6,
91 OP_CB_PUSH_DELEG = 7,
92 OP_CB_RECALL_ANY = 8,
93 OP_CB_RECALLABLE_OBJ_AVAIL = 9,
94 OP_CB_RECALL_SLOT = 10,
95 OP_CB_SEQUENCE = 11,
96 OP_CB_WANTS_CANCELLED = 12,
97 OP_CB_NOTIFY_LOCK = 13,
98 OP_CB_NOTIFY_DEVICEID = 14,
99 OP_CB_OFFLOAD = 15,
100 OP_CB_ILLEGAL = 10044
101};
102
103static void encode_nfs_cb_opnum4(struct xdr_stream *xdr, enum nfs_cb_opnum4 op)
104{
105 __be32 *p;
106
107 p = xdr_reserve_space(xdr, 4);
108 *p = cpu_to_be32(op);
109}
110
111
112
113
114
115
116static void encode_nfs_fh4(struct xdr_stream *xdr, const struct knfsd_fh *fh)
117{
118 u32 length = fh->fh_size;
119 __be32 *p;
120
121 BUG_ON(length > NFS4_FHSIZE);
122 p = xdr_reserve_space(xdr, 4 + length);
123 xdr_encode_opaque(p, &fh->fh_base, length);
124}
125
126
127
128
129
130
131
132
133
134static void encode_stateid4(struct xdr_stream *xdr, const stateid_t *sid)
135{
136 __be32 *p;
137
138 p = xdr_reserve_space(xdr, NFS4_STATEID_SIZE);
139 *p++ = cpu_to_be32(sid->si_generation);
140 xdr_encode_opaque_fixed(p, &sid->si_opaque, NFS4_STATEID_OTHER_SIZE);
141}
142
143
144
145
146
147
148static void encode_sessionid4(struct xdr_stream *xdr,
149 const struct nfsd4_session *session)
150{
151 __be32 *p;
152
153 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN);
154 xdr_encode_opaque_fixed(p, session->se_sessionid.data,
155 NFS4_MAX_SESSIONID_LEN);
156}
157
158
159
160
161static const struct {
162 int stat;
163 int errno;
164} nfs_cb_errtbl[] = {
165 { NFS4_OK, 0 },
166 { NFS4ERR_PERM, -EPERM },
167 { NFS4ERR_NOENT, -ENOENT },
168 { NFS4ERR_IO, -EIO },
169 { NFS4ERR_NXIO, -ENXIO },
170 { NFS4ERR_ACCESS, -EACCES },
171 { NFS4ERR_EXIST, -EEXIST },
172 { NFS4ERR_XDEV, -EXDEV },
173 { NFS4ERR_NOTDIR, -ENOTDIR },
174 { NFS4ERR_ISDIR, -EISDIR },
175 { NFS4ERR_INVAL, -EINVAL },
176 { NFS4ERR_FBIG, -EFBIG },
177 { NFS4ERR_NOSPC, -ENOSPC },
178 { NFS4ERR_ROFS, -EROFS },
179 { NFS4ERR_MLINK, -EMLINK },
180 { NFS4ERR_NAMETOOLONG, -ENAMETOOLONG },
181 { NFS4ERR_NOTEMPTY, -ENOTEMPTY },
182 { NFS4ERR_DQUOT, -EDQUOT },
183 { NFS4ERR_STALE, -ESTALE },
184 { NFS4ERR_BADHANDLE, -EBADHANDLE },
185 { NFS4ERR_BAD_COOKIE, -EBADCOOKIE },
186 { NFS4ERR_NOTSUPP, -ENOTSUPP },
187 { NFS4ERR_TOOSMALL, -ETOOSMALL },
188 { NFS4ERR_SERVERFAULT, -ESERVERFAULT },
189 { NFS4ERR_BADTYPE, -EBADTYPE },
190 { NFS4ERR_LOCKED, -EAGAIN },
191 { NFS4ERR_RESOURCE, -EREMOTEIO },
192 { NFS4ERR_SYMLINK, -ELOOP },
193 { NFS4ERR_OP_ILLEGAL, -EOPNOTSUPP },
194 { NFS4ERR_DEADLOCK, -EDEADLK },
195 { -1, -EIO }
196};
197
198
199
200
201
202
203
204
205static int nfs_cb_stat_to_errno(int status)
206{
207 int i;
208
209 for (i = 0; nfs_cb_errtbl[i].stat != -1; i++) {
210 if (nfs_cb_errtbl[i].stat == status)
211 return nfs_cb_errtbl[i].errno;
212 }
213
214 dprintk("NFSD: Unrecognized NFS CB status value: %u\n", status);
215 return -status;
216}
217
218static int decode_cb_op_status(struct xdr_stream *xdr,
219 enum nfs_cb_opnum4 expected, int *status)
220{
221 __be32 *p;
222 u32 op;
223
224 p = xdr_inline_decode(xdr, 4 + 4);
225 if (unlikely(p == NULL))
226 goto out_overflow;
227 op = be32_to_cpup(p++);
228 if (unlikely(op != expected))
229 goto out_unexpected;
230 *status = nfs_cb_stat_to_errno(be32_to_cpup(p));
231 return 0;
232out_overflow:
233 return -EIO;
234out_unexpected:
235 dprintk("NFSD: Callback server returned operation %d but "
236 "we issued a request for %d\n", op, expected);
237 return -EIO;
238}
239
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248
249
250static void encode_cb_compound4args(struct xdr_stream *xdr,
251 struct nfs4_cb_compound_hdr *hdr)
252{
253 __be32 * p;
254
255 p = xdr_reserve_space(xdr, 4 + 4 + 4 + 4);
256 p = xdr_encode_empty_array(p);
257 *p++ = cpu_to_be32(hdr->minorversion);
258 *p++ = cpu_to_be32(hdr->ident);
259
260 hdr->nops_p = p;
261 *p = cpu_to_be32(hdr->nops);
262}
263
264
265
266
267static void encode_cb_nops(struct nfs4_cb_compound_hdr *hdr)
268{
269 BUG_ON(hdr->nops > NFS4_MAX_BACK_CHANNEL_OPS);
270 *hdr->nops_p = cpu_to_be32(hdr->nops);
271}
272
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281
282static int decode_cb_compound4res(struct xdr_stream *xdr,
283 struct nfs4_cb_compound_hdr *hdr)
284{
285 u32 length;
286 __be32 *p;
287
288 p = xdr_inline_decode(xdr, 4 + 4);
289 if (unlikely(p == NULL))
290 goto out_overflow;
291 hdr->status = be32_to_cpup(p++);
292
293 length = be32_to_cpup(p++);
294 p = xdr_inline_decode(xdr, length + 4);
295 if (unlikely(p == NULL))
296 goto out_overflow;
297 p += XDR_QUADLEN(length);
298 hdr->nops = be32_to_cpup(p);
299 return 0;
300out_overflow:
301 return -EIO;
302}
303
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311
312
313static void encode_cb_recall4args(struct xdr_stream *xdr,
314 const struct nfs4_delegation *dp,
315 struct nfs4_cb_compound_hdr *hdr)
316{
317 __be32 *p;
318
319 encode_nfs_cb_opnum4(xdr, OP_CB_RECALL);
320 encode_stateid4(xdr, &dp->dl_stid.sc_stateid);
321
322 p = xdr_reserve_space(xdr, 4);
323 *p++ = xdr_zero;
324
325 encode_nfs_fh4(xdr, &dp->dl_stid.sc_file->fi_fhandle);
326
327 hdr->nops++;
328}
329
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340
341
342static void encode_cb_sequence4args(struct xdr_stream *xdr,
343 const struct nfsd4_callback *cb,
344 struct nfs4_cb_compound_hdr *hdr)
345{
346 struct nfsd4_session *session = cb->cb_clp->cl_cb_session;
347 __be32 *p;
348
349 if (hdr->minorversion == 0)
350 return;
351
352 encode_nfs_cb_opnum4(xdr, OP_CB_SEQUENCE);
353 encode_sessionid4(xdr, session);
354
355 p = xdr_reserve_space(xdr, 4 + 4 + 4 + 4 + 4);
356 *p++ = cpu_to_be32(session->se_cb_seq_nr);
357 *p++ = xdr_zero;
358 *p++ = xdr_zero;
359 *p++ = xdr_zero;
360 xdr_encode_empty_array(p);
361
362 hdr->nops++;
363}
364
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386static int decode_cb_sequence4resok(struct xdr_stream *xdr,
387 struct nfsd4_callback *cb)
388{
389 struct nfsd4_session *session = cb->cb_clp->cl_cb_session;
390 int status = -ESERVERFAULT;
391 __be32 *p;
392 u32 dummy;
393
394
395
396
397
398 p = xdr_inline_decode(xdr, NFS4_MAX_SESSIONID_LEN + 4 + 4 + 4 + 4);
399 if (unlikely(p == NULL))
400 goto out_overflow;
401
402 if (memcmp(p, session->se_sessionid.data, NFS4_MAX_SESSIONID_LEN)) {
403 dprintk("NFS: %s Invalid session id\n", __func__);
404 goto out;
405 }
406 p += XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN);
407
408 dummy = be32_to_cpup(p++);
409 if (dummy != session->se_cb_seq_nr) {
410 dprintk("NFS: %s Invalid sequence number\n", __func__);
411 goto out;
412 }
413
414 dummy = be32_to_cpup(p++);
415 if (dummy != 0) {
416 dprintk("NFS: %s Invalid slotid\n", __func__);
417 goto out;
418 }
419
420
421
422
423 status = 0;
424out:
425 cb->cb_seq_status = status;
426 return status;
427out_overflow:
428 status = -EIO;
429 goto out;
430}
431
432static int decode_cb_sequence4res(struct xdr_stream *xdr,
433 struct nfsd4_callback *cb)
434{
435 int status;
436
437 if (cb->cb_clp->cl_minorversion == 0)
438 return 0;
439
440 status = decode_cb_op_status(xdr, OP_CB_SEQUENCE, &cb->cb_seq_status);
441 if (unlikely(status || cb->cb_seq_status))
442 return status;
443
444 return decode_cb_sequence4resok(xdr, cb);
445}
446
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458
459static void nfs4_xdr_enc_cb_null(struct rpc_rqst *req, struct xdr_stream *xdr,
460 const void *__unused)
461{
462 xdr_reserve_space(xdr, 0);
463}
464
465
466
467
468static void nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, struct xdr_stream *xdr,
469 const void *data)
470{
471 const struct nfsd4_callback *cb = data;
472 const struct nfs4_delegation *dp = cb_to_delegation(cb);
473 struct nfs4_cb_compound_hdr hdr = {
474 .ident = cb->cb_clp->cl_cb_ident,
475 .minorversion = cb->cb_clp->cl_minorversion,
476 };
477
478 encode_cb_compound4args(xdr, &hdr);
479 encode_cb_sequence4args(xdr, cb, &hdr);
480 encode_cb_recall4args(xdr, dp, &hdr);
481 encode_cb_nops(&hdr);
482}
483
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493
494static int nfs4_xdr_dec_cb_null(struct rpc_rqst *req, struct xdr_stream *xdr,
495 void *__unused)
496{
497 return 0;
498}
499
500
501
502
503static int nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp,
504 struct xdr_stream *xdr,
505 void *data)
506{
507 struct nfsd4_callback *cb = data;
508 struct nfs4_cb_compound_hdr hdr;
509 int status;
510
511 status = decode_cb_compound4res(xdr, &hdr);
512 if (unlikely(status))
513 return status;
514
515 if (cb != NULL) {
516 status = decode_cb_sequence4res(xdr, cb);
517 if (unlikely(status || cb->cb_seq_status))
518 return status;
519 }
520
521 return decode_cb_op_status(xdr, OP_CB_RECALL, &cb->cb_status);
522}
523
524#ifdef CONFIG_NFSD_PNFS
525
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550
551static void encode_cb_layout4args(struct xdr_stream *xdr,
552 const struct nfs4_layout_stateid *ls,
553 struct nfs4_cb_compound_hdr *hdr)
554{
555 __be32 *p;
556
557 BUG_ON(hdr->minorversion == 0);
558
559 p = xdr_reserve_space(xdr, 5 * 4);
560 *p++ = cpu_to_be32(OP_CB_LAYOUTRECALL);
561 *p++ = cpu_to_be32(ls->ls_layout_type);
562 *p++ = cpu_to_be32(IOMODE_ANY);
563 *p++ = cpu_to_be32(1);
564 *p = cpu_to_be32(RETURN_FILE);
565
566 encode_nfs_fh4(xdr, &ls->ls_stid.sc_file->fi_fhandle);
567
568 p = xdr_reserve_space(xdr, 2 * 8);
569 p = xdr_encode_hyper(p, 0);
570 xdr_encode_hyper(p, NFS4_MAX_UINT64);
571
572 encode_stateid4(xdr, &ls->ls_recall_sid);
573
574 hdr->nops++;
575}
576
577static void nfs4_xdr_enc_cb_layout(struct rpc_rqst *req,
578 struct xdr_stream *xdr,
579 const void *data)
580{
581 const struct nfsd4_callback *cb = data;
582 const struct nfs4_layout_stateid *ls =
583 container_of(cb, struct nfs4_layout_stateid, ls_recall);
584 struct nfs4_cb_compound_hdr hdr = {
585 .ident = 0,
586 .minorversion = cb->cb_clp->cl_minorversion,
587 };
588
589 encode_cb_compound4args(xdr, &hdr);
590 encode_cb_sequence4args(xdr, cb, &hdr);
591 encode_cb_layout4args(xdr, ls, &hdr);
592 encode_cb_nops(&hdr);
593}
594
595static int nfs4_xdr_dec_cb_layout(struct rpc_rqst *rqstp,
596 struct xdr_stream *xdr,
597 void *data)
598{
599 struct nfsd4_callback *cb = data;
600 struct nfs4_cb_compound_hdr hdr;
601 int status;
602
603 status = decode_cb_compound4res(xdr, &hdr);
604 if (unlikely(status))
605 return status;
606
607 if (cb) {
608 status = decode_cb_sequence4res(xdr, cb);
609 if (unlikely(status || cb->cb_seq_status))
610 return status;
611 }
612 return decode_cb_op_status(xdr, OP_CB_LAYOUTRECALL, &cb->cb_status);
613}
614#endif
615
616static void encode_stateowner(struct xdr_stream *xdr, struct nfs4_stateowner *so)
617{
618 __be32 *p;
619
620 p = xdr_reserve_space(xdr, 8 + 4 + so->so_owner.len);
621 p = xdr_encode_opaque_fixed(p, &so->so_client->cl_clientid, 8);
622 xdr_encode_opaque(p, so->so_owner.data, so->so_owner.len);
623}
624
625static void nfs4_xdr_enc_cb_notify_lock(struct rpc_rqst *req,
626 struct xdr_stream *xdr,
627 const void *data)
628{
629 const struct nfsd4_callback *cb = data;
630 const struct nfsd4_blocked_lock *nbl =
631 container_of(cb, struct nfsd4_blocked_lock, nbl_cb);
632 struct nfs4_lockowner *lo = (struct nfs4_lockowner *)nbl->nbl_lock.fl_owner;
633 struct nfs4_cb_compound_hdr hdr = {
634 .ident = 0,
635 .minorversion = cb->cb_clp->cl_minorversion,
636 };
637
638 __be32 *p;
639
640 BUG_ON(hdr.minorversion == 0);
641
642 encode_cb_compound4args(xdr, &hdr);
643 encode_cb_sequence4args(xdr, cb, &hdr);
644
645 p = xdr_reserve_space(xdr, 4);
646 *p = cpu_to_be32(OP_CB_NOTIFY_LOCK);
647 encode_nfs_fh4(xdr, &nbl->nbl_fh);
648 encode_stateowner(xdr, &lo->lo_owner);
649 hdr.nops++;
650
651 encode_cb_nops(&hdr);
652}
653
654static int nfs4_xdr_dec_cb_notify_lock(struct rpc_rqst *rqstp,
655 struct xdr_stream *xdr,
656 void *data)
657{
658 struct nfsd4_callback *cb = data;
659 struct nfs4_cb_compound_hdr hdr;
660 int status;
661
662 status = decode_cb_compound4res(xdr, &hdr);
663 if (unlikely(status))
664 return status;
665
666 if (cb) {
667 status = decode_cb_sequence4res(xdr, cb);
668 if (unlikely(status || cb->cb_seq_status))
669 return status;
670 }
671 return decode_cb_op_status(xdr, OP_CB_NOTIFY_LOCK, &cb->cb_status);
672}
673
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692
693static void encode_offload_info4(struct xdr_stream *xdr,
694 __be32 nfserr,
695 const struct nfsd4_copy *cp)
696{
697 __be32 *p;
698
699 p = xdr_reserve_space(xdr, 4);
700 *p++ = nfserr;
701 if (!nfserr) {
702 p = xdr_reserve_space(xdr, 4 + 8 + 4 + NFS4_VERIFIER_SIZE);
703 p = xdr_encode_empty_array(p);
704 p = xdr_encode_hyper(p, cp->cp_res.wr_bytes_written);
705 *p++ = cpu_to_be32(cp->cp_res.wr_stable_how);
706 p = xdr_encode_opaque_fixed(p, cp->cp_res.wr_verifier.data,
707 NFS4_VERIFIER_SIZE);
708 } else {
709 p = xdr_reserve_space(xdr, 8);
710
711 p = xdr_encode_hyper(p, 0);
712 }
713}
714
715static void encode_cb_offload4args(struct xdr_stream *xdr,
716 __be32 nfserr,
717 const struct knfsd_fh *fh,
718 const struct nfsd4_copy *cp,
719 struct nfs4_cb_compound_hdr *hdr)
720{
721 __be32 *p;
722
723 p = xdr_reserve_space(xdr, 4);
724 *p++ = cpu_to_be32(OP_CB_OFFLOAD);
725 encode_nfs_fh4(xdr, fh);
726 encode_stateid4(xdr, &cp->cp_res.cb_stateid);
727 encode_offload_info4(xdr, nfserr, cp);
728
729 hdr->nops++;
730}
731
732static void nfs4_xdr_enc_cb_offload(struct rpc_rqst *req,
733 struct xdr_stream *xdr,
734 const void *data)
735{
736 const struct nfsd4_callback *cb = data;
737 const struct nfsd4_copy *cp =
738 container_of(cb, struct nfsd4_copy, cp_cb);
739 struct nfs4_cb_compound_hdr hdr = {
740 .ident = 0,
741 .minorversion = cb->cb_clp->cl_minorversion,
742 };
743
744 encode_cb_compound4args(xdr, &hdr);
745 encode_cb_sequence4args(xdr, cb, &hdr);
746 encode_cb_offload4args(xdr, cp->nfserr, &cp->fh, cp, &hdr);
747 encode_cb_nops(&hdr);
748}
749
750static int nfs4_xdr_dec_cb_offload(struct rpc_rqst *rqstp,
751 struct xdr_stream *xdr,
752 void *data)
753{
754 struct nfsd4_callback *cb = data;
755 struct nfs4_cb_compound_hdr hdr;
756 int status;
757
758 status = decode_cb_compound4res(xdr, &hdr);
759 if (unlikely(status))
760 return status;
761
762 if (cb) {
763 status = decode_cb_sequence4res(xdr, cb);
764 if (unlikely(status || cb->cb_seq_status))
765 return status;
766 }
767 return decode_cb_op_status(xdr, OP_CB_OFFLOAD, &cb->cb_status);
768}
769
770
771
772#define PROC(proc, call, argtype, restype) \
773[NFSPROC4_CLNT_##proc] = { \
774 .p_proc = NFSPROC4_CB_##call, \
775 .p_encode = nfs4_xdr_enc_##argtype, \
776 .p_decode = nfs4_xdr_dec_##restype, \
777 .p_arglen = NFS4_enc_##argtype##_sz, \
778 .p_replen = NFS4_dec_##restype##_sz, \
779 .p_statidx = NFSPROC4_CB_##call, \
780 .p_name = #proc, \
781}
782
783static const struct rpc_procinfo nfs4_cb_procedures[] = {
784 PROC(CB_NULL, NULL, cb_null, cb_null),
785 PROC(CB_RECALL, COMPOUND, cb_recall, cb_recall),
786#ifdef CONFIG_NFSD_PNFS
787 PROC(CB_LAYOUT, COMPOUND, cb_layout, cb_layout),
788#endif
789 PROC(CB_NOTIFY_LOCK, COMPOUND, cb_notify_lock, cb_notify_lock),
790 PROC(CB_OFFLOAD, COMPOUND, cb_offload, cb_offload),
791};
792
793static unsigned int nfs4_cb_counts[ARRAY_SIZE(nfs4_cb_procedures)];
794static const struct rpc_version nfs_cb_version4 = {
795
796
797
798
799
800
801
802 .number = 1,
803 .nrprocs = ARRAY_SIZE(nfs4_cb_procedures),
804 .procs = nfs4_cb_procedures,
805 .counts = nfs4_cb_counts,
806};
807
808static const struct rpc_version *nfs_cb_version[2] = {
809 [1] = &nfs_cb_version4,
810};
811
812static const struct rpc_program cb_program;
813
814static struct rpc_stat cb_stats = {
815 .program = &cb_program
816};
817
818#define NFS4_CALLBACK 0x40000000
819static const struct rpc_program cb_program = {
820 .name = "nfs4_cb",
821 .number = NFS4_CALLBACK,
822 .nrvers = ARRAY_SIZE(nfs_cb_version),
823 .version = nfs_cb_version,
824 .stats = &cb_stats,
825 .pipe_dir_name = "nfsd4_cb",
826};
827
828static int max_cb_time(struct net *net)
829{
830 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
831 return max(nn->nfsd4_lease/10, (time_t)1) * HZ;
832}
833
834static const struct cred *get_backchannel_cred(struct nfs4_client *clp, struct rpc_clnt *client, struct nfsd4_session *ses)
835{
836 if (clp->cl_minorversion == 0) {
837 client->cl_principal = clp->cl_cred.cr_targ_princ ?
838 clp->cl_cred.cr_targ_princ : "nfs";
839
840 return get_cred(rpc_machine_cred());
841 } else {
842 struct cred *kcred;
843
844 kcred = prepare_kernel_cred(NULL);
845 if (!kcred)
846 return NULL;
847
848 kcred->uid = ses->se_cb_sec.uid;
849 kcred->gid = ses->se_cb_sec.gid;
850 return kcred;
851 }
852}
853
854static int setup_callback_client(struct nfs4_client *clp, struct nfs4_cb_conn *conn, struct nfsd4_session *ses)
855{
856 int maxtime = max_cb_time(clp->net);
857 struct rpc_timeout timeparms = {
858 .to_initval = maxtime,
859 .to_retries = 0,
860 .to_maxval = maxtime,
861 };
862 struct rpc_create_args args = {
863 .net = clp->net,
864 .address = (struct sockaddr *) &conn->cb_addr,
865 .addrsize = conn->cb_addrlen,
866 .saddress = (struct sockaddr *) &conn->cb_saddr,
867 .timeout = &timeparms,
868 .program = &cb_program,
869 .version = 1,
870 .flags = (RPC_CLNT_CREATE_NOPING | RPC_CLNT_CREATE_QUIET),
871 .cred = current_cred(),
872 };
873 struct rpc_clnt *client;
874 const struct cred *cred;
875
876 if (clp->cl_minorversion == 0) {
877 if (!clp->cl_cred.cr_principal &&
878 (clp->cl_cred.cr_flavor >= RPC_AUTH_GSS_KRB5))
879 return -EINVAL;
880 args.client_name = clp->cl_cred.cr_principal;
881 args.prognumber = conn->cb_prog;
882 args.protocol = XPRT_TRANSPORT_TCP;
883 args.authflavor = clp->cl_cred.cr_flavor;
884 clp->cl_cb_ident = conn->cb_ident;
885 } else {
886 if (!conn->cb_xprt)
887 return -EINVAL;
888 clp->cl_cb_conn.cb_xprt = conn->cb_xprt;
889 clp->cl_cb_session = ses;
890 args.bc_xprt = conn->cb_xprt;
891 args.prognumber = clp->cl_cb_session->se_cb_prog;
892 args.protocol = conn->cb_xprt->xpt_class->xcl_ident |
893 XPRT_TRANSPORT_BC;
894 args.authflavor = ses->se_cb_sec.flavor;
895 }
896
897 client = rpc_create(&args);
898 if (IS_ERR(client)) {
899 dprintk("NFSD: couldn't create callback client: %ld\n",
900 PTR_ERR(client));
901 return PTR_ERR(client);
902 }
903 cred = get_backchannel_cred(clp, client, ses);
904 if (!cred) {
905 rpc_shutdown_client(client);
906 return -ENOMEM;
907 }
908 clp->cl_cb_client = client;
909 clp->cl_cb_cred = cred;
910 return 0;
911}
912
913static void warn_no_callback_path(struct nfs4_client *clp, int reason)
914{
915 dprintk("NFSD: warning: no callback path to client %.*s: error %d\n",
916 (int)clp->cl_name.len, clp->cl_name.data, reason);
917}
918
919static void nfsd4_mark_cb_down(struct nfs4_client *clp, int reason)
920{
921 if (test_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags))
922 return;
923 clp->cl_cb_state = NFSD4_CB_DOWN;
924 warn_no_callback_path(clp, reason);
925}
926
927static void nfsd4_mark_cb_fault(struct nfs4_client *clp, int reason)
928{
929 if (test_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags))
930 return;
931 clp->cl_cb_state = NFSD4_CB_FAULT;
932 warn_no_callback_path(clp, reason);
933}
934
935static void nfsd4_cb_probe_done(struct rpc_task *task, void *calldata)
936{
937 struct nfs4_client *clp = container_of(calldata, struct nfs4_client, cl_cb_null);
938
939 if (task->tk_status)
940 nfsd4_mark_cb_down(clp, task->tk_status);
941 else
942 clp->cl_cb_state = NFSD4_CB_UP;
943}
944
945static const struct rpc_call_ops nfsd4_cb_probe_ops = {
946
947
948 .rpc_call_done = nfsd4_cb_probe_done,
949};
950
951static struct workqueue_struct *callback_wq;
952
953
954
955
956
957void nfsd4_probe_callback(struct nfs4_client *clp)
958{
959 clp->cl_cb_state = NFSD4_CB_UNKNOWN;
960 set_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags);
961 nfsd4_run_cb(&clp->cl_cb_null);
962}
963
964void nfsd4_probe_callback_sync(struct nfs4_client *clp)
965{
966 nfsd4_probe_callback(clp);
967 flush_workqueue(callback_wq);
968}
969
970void nfsd4_change_callback(struct nfs4_client *clp, struct nfs4_cb_conn *conn)
971{
972 clp->cl_cb_state = NFSD4_CB_UNKNOWN;
973 spin_lock(&clp->cl_lock);
974 memcpy(&clp->cl_cb_conn, conn, sizeof(struct nfs4_cb_conn));
975 spin_unlock(&clp->cl_lock);
976}
977
978
979
980
981
982
983static bool nfsd41_cb_get_slot(struct nfs4_client *clp, struct rpc_task *task)
984{
985 if (test_and_set_bit(0, &clp->cl_cb_slot_busy) != 0) {
986 rpc_sleep_on(&clp->cl_cb_waitq, task, NULL);
987
988 if (test_and_set_bit(0, &clp->cl_cb_slot_busy) != 0) {
989 dprintk("%s slot is busy\n", __func__);
990 return false;
991 }
992 rpc_wake_up_queued_task(&clp->cl_cb_waitq, task);
993 }
994 return true;
995}
996
997
998
999
1000
1001static void nfsd4_cb_prepare(struct rpc_task *task, void *calldata)
1002{
1003 struct nfsd4_callback *cb = calldata;
1004 struct nfs4_client *clp = cb->cb_clp;
1005 u32 minorversion = clp->cl_minorversion;
1006
1007
1008
1009
1010
1011 cb->cb_seq_status = 1;
1012 cb->cb_status = 0;
1013 if (minorversion) {
1014 if (!cb->cb_holds_slot && !nfsd41_cb_get_slot(clp, task))
1015 return;
1016 cb->cb_holds_slot = true;
1017 }
1018 rpc_call_start(task);
1019}
1020
1021static bool nfsd4_cb_sequence_done(struct rpc_task *task, struct nfsd4_callback *cb)
1022{
1023 struct nfs4_client *clp = cb->cb_clp;
1024 struct nfsd4_session *session = clp->cl_cb_session;
1025 bool ret = true;
1026
1027 if (!clp->cl_minorversion) {
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037 if (RPC_SIGNALLED(task))
1038 goto need_restart;
1039
1040 return true;
1041 }
1042
1043 if (!cb->cb_holds_slot)
1044 goto need_restart;
1045
1046 switch (cb->cb_seq_status) {
1047 case 0:
1048
1049
1050
1051
1052
1053
1054
1055 ++session->se_cb_seq_nr;
1056 break;
1057 case -ESERVERFAULT:
1058 ++session->se_cb_seq_nr;
1059
1060 case 1:
1061 case -NFS4ERR_BADSESSION:
1062 nfsd4_mark_cb_fault(cb->cb_clp, cb->cb_seq_status);
1063 ret = false;
1064 break;
1065 case -NFS4ERR_DELAY:
1066 if (!rpc_restart_call(task))
1067 goto out;
1068
1069 rpc_delay(task, 2 * HZ);
1070 return false;
1071 case -NFS4ERR_BADSLOT:
1072 goto retry_nowait;
1073 case -NFS4ERR_SEQ_MISORDERED:
1074 if (session->se_cb_seq_nr != 1) {
1075 session->se_cb_seq_nr = 1;
1076 goto retry_nowait;
1077 }
1078 break;
1079 default:
1080 dprintk("%s: unprocessed error %d\n", __func__,
1081 cb->cb_seq_status);
1082 }
1083
1084 cb->cb_holds_slot = false;
1085 clear_bit(0, &clp->cl_cb_slot_busy);
1086 rpc_wake_up_next(&clp->cl_cb_waitq);
1087 dprintk("%s: freed slot, new seqid=%d\n", __func__,
1088 clp->cl_cb_session->se_cb_seq_nr);
1089
1090 if (RPC_SIGNALLED(task))
1091 goto need_restart;
1092out:
1093 return ret;
1094retry_nowait:
1095 if (rpc_restart_call_prepare(task))
1096 ret = false;
1097 goto out;
1098need_restart:
1099 task->tk_status = 0;
1100 cb->cb_need_restart = true;
1101 return false;
1102}
1103
1104static void nfsd4_cb_done(struct rpc_task *task, void *calldata)
1105{
1106 struct nfsd4_callback *cb = calldata;
1107 struct nfs4_client *clp = cb->cb_clp;
1108
1109 dprintk("%s: minorversion=%d\n", __func__,
1110 clp->cl_minorversion);
1111
1112 if (!nfsd4_cb_sequence_done(task, cb))
1113 return;
1114
1115 if (cb->cb_status) {
1116 WARN_ON_ONCE(task->tk_status);
1117 task->tk_status = cb->cb_status;
1118 }
1119
1120 switch (cb->cb_ops->done(cb, task)) {
1121 case 0:
1122 task->tk_status = 0;
1123 rpc_restart_call_prepare(task);
1124 return;
1125 case 1:
1126 switch (task->tk_status) {
1127 case -EIO:
1128 case -ETIMEDOUT:
1129 nfsd4_mark_cb_down(clp, task->tk_status);
1130 }
1131 break;
1132 default:
1133 BUG();
1134 }
1135}
1136
1137static void nfsd4_cb_release(void *calldata)
1138{
1139 struct nfsd4_callback *cb = calldata;
1140
1141 if (cb->cb_need_restart)
1142 nfsd4_run_cb(cb);
1143 else
1144 cb->cb_ops->release(cb);
1145
1146}
1147
1148static const struct rpc_call_ops nfsd4_cb_ops = {
1149 .rpc_call_prepare = nfsd4_cb_prepare,
1150 .rpc_call_done = nfsd4_cb_done,
1151 .rpc_release = nfsd4_cb_release,
1152};
1153
1154int nfsd4_create_callback_queue(void)
1155{
1156 callback_wq = alloc_ordered_workqueue("nfsd4_callbacks", 0);
1157 if (!callback_wq)
1158 return -ENOMEM;
1159 return 0;
1160}
1161
1162void nfsd4_destroy_callback_queue(void)
1163{
1164 destroy_workqueue(callback_wq);
1165}
1166
1167
1168void nfsd4_shutdown_callback(struct nfs4_client *clp)
1169{
1170 set_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags);
1171
1172
1173
1174
1175
1176 nfsd4_run_cb(&clp->cl_cb_null);
1177 flush_workqueue(callback_wq);
1178}
1179
1180
1181static struct nfsd4_conn * __nfsd4_find_backchannel(struct nfs4_client *clp)
1182{
1183 struct nfsd4_session *s;
1184 struct nfsd4_conn *c;
1185
1186 list_for_each_entry(s, &clp->cl_sessions, se_perclnt) {
1187 list_for_each_entry(c, &s->se_conns, cn_persession) {
1188 if (c->cn_flags & NFS4_CDFC4_BACK)
1189 return c;
1190 }
1191 }
1192 return NULL;
1193}
1194
1195static void nfsd4_process_cb_update(struct nfsd4_callback *cb)
1196{
1197 struct nfs4_cb_conn conn;
1198 struct nfs4_client *clp = cb->cb_clp;
1199 struct nfsd4_session *ses = NULL;
1200 struct nfsd4_conn *c;
1201 int err;
1202
1203
1204
1205
1206
1207 if (clp->cl_cb_client) {
1208 rpc_shutdown_client(clp->cl_cb_client);
1209 clp->cl_cb_client = NULL;
1210 put_cred(clp->cl_cb_cred);
1211 clp->cl_cb_cred = NULL;
1212 }
1213 if (clp->cl_cb_conn.cb_xprt) {
1214 svc_xprt_put(clp->cl_cb_conn.cb_xprt);
1215 clp->cl_cb_conn.cb_xprt = NULL;
1216 }
1217 if (test_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags))
1218 return;
1219 spin_lock(&clp->cl_lock);
1220
1221
1222
1223
1224 BUG_ON(!(clp->cl_flags & NFSD4_CLIENT_CB_FLAG_MASK));
1225 clear_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags);
1226 memcpy(&conn, &cb->cb_clp->cl_cb_conn, sizeof(struct nfs4_cb_conn));
1227 c = __nfsd4_find_backchannel(clp);
1228 if (c) {
1229 svc_xprt_get(c->cn_xprt);
1230 conn.cb_xprt = c->cn_xprt;
1231 ses = c->cn_session;
1232 }
1233 spin_unlock(&clp->cl_lock);
1234
1235 err = setup_callback_client(clp, &conn, ses);
1236 if (err) {
1237 nfsd4_mark_cb_down(clp, err);
1238 return;
1239 }
1240}
1241
1242static void
1243nfsd4_run_cb_work(struct work_struct *work)
1244{
1245 struct nfsd4_callback *cb =
1246 container_of(work, struct nfsd4_callback, cb_work);
1247 struct nfs4_client *clp = cb->cb_clp;
1248 struct rpc_clnt *clnt;
1249
1250 if (cb->cb_need_restart) {
1251 cb->cb_need_restart = false;
1252 } else {
1253 if (cb->cb_ops && cb->cb_ops->prepare)
1254 cb->cb_ops->prepare(cb);
1255 }
1256
1257 if (clp->cl_flags & NFSD4_CLIENT_CB_FLAG_MASK)
1258 nfsd4_process_cb_update(cb);
1259
1260 clnt = clp->cl_cb_client;
1261 if (!clnt) {
1262
1263 if (cb->cb_ops && cb->cb_ops->release)
1264 cb->cb_ops->release(cb);
1265 return;
1266 }
1267
1268
1269
1270
1271 if (!cb->cb_ops && clp->cl_minorversion) {
1272 clp->cl_cb_state = NFSD4_CB_UP;
1273 return;
1274 }
1275
1276 cb->cb_msg.rpc_cred = clp->cl_cb_cred;
1277 rpc_call_async(clnt, &cb->cb_msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN,
1278 cb->cb_ops ? &nfsd4_cb_ops : &nfsd4_cb_probe_ops, cb);
1279}
1280
1281void nfsd4_init_cb(struct nfsd4_callback *cb, struct nfs4_client *clp,
1282 const struct nfsd4_callback_ops *ops, enum nfsd4_cb_op op)
1283{
1284 cb->cb_clp = clp;
1285 cb->cb_msg.rpc_proc = &nfs4_cb_procedures[op];
1286 cb->cb_msg.rpc_argp = cb;
1287 cb->cb_msg.rpc_resp = cb;
1288 cb->cb_ops = ops;
1289 INIT_WORK(&cb->cb_work, nfsd4_run_cb_work);
1290 cb->cb_seq_status = 1;
1291 cb->cb_status = 0;
1292 cb->cb_need_restart = false;
1293 cb->cb_holds_slot = false;
1294}
1295
1296void nfsd4_run_cb(struct nfsd4_callback *cb)
1297{
1298 queue_work(callback_wq, &cb->cb_work);
1299}
1300