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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 "trace.h"
42#include "xdr4cb.h"
43#include "xdr4.h"
44
45#define NFSDDBG_FACILITY NFSDDBG_PROC
46
47static void nfsd4_mark_cb_fault(struct nfs4_client *, int reason);
48
49#define NFSPROC4_CB_NULL 0
50#define NFSPROC4_CB_COMPOUND 1
51
52
53
54struct nfs4_cb_compound_hdr {
55
56 u32 ident;
57 u32 nops;
58 __be32 *nops_p;
59 u32 minorversion;
60
61 int status;
62};
63
64static __be32 *xdr_encode_empty_array(__be32 *p)
65{
66 *p++ = xdr_zero;
67 return p;
68}
69
70
71
72
73
74
75
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84
85
86
87enum nfs_cb_opnum4 {
88 OP_CB_GETATTR = 3,
89 OP_CB_RECALL = 4,
90 OP_CB_LAYOUTRECALL = 5,
91 OP_CB_NOTIFY = 6,
92 OP_CB_PUSH_DELEG = 7,
93 OP_CB_RECALL_ANY = 8,
94 OP_CB_RECALLABLE_OBJ_AVAIL = 9,
95 OP_CB_RECALL_SLOT = 10,
96 OP_CB_SEQUENCE = 11,
97 OP_CB_WANTS_CANCELLED = 12,
98 OP_CB_NOTIFY_LOCK = 13,
99 OP_CB_NOTIFY_DEVICEID = 14,
100 OP_CB_OFFLOAD = 15,
101 OP_CB_ILLEGAL = 10044
102};
103
104static void encode_nfs_cb_opnum4(struct xdr_stream *xdr, enum nfs_cb_opnum4 op)
105{
106 __be32 *p;
107
108 p = xdr_reserve_space(xdr, 4);
109 *p = cpu_to_be32(op);
110}
111
112
113
114
115
116
117static void encode_nfs_fh4(struct xdr_stream *xdr, const struct knfsd_fh *fh)
118{
119 u32 length = fh->fh_size;
120 __be32 *p;
121
122 BUG_ON(length > NFS4_FHSIZE);
123 p = xdr_reserve_space(xdr, 4 + length);
124 xdr_encode_opaque(p, &fh->fh_base, length);
125}
126
127
128
129
130
131
132
133
134
135static void encode_stateid4(struct xdr_stream *xdr, const stateid_t *sid)
136{
137 __be32 *p;
138
139 p = xdr_reserve_space(xdr, NFS4_STATEID_SIZE);
140 *p++ = cpu_to_be32(sid->si_generation);
141 xdr_encode_opaque_fixed(p, &sid->si_opaque, NFS4_STATEID_OTHER_SIZE);
142}
143
144
145
146
147
148
149static void encode_sessionid4(struct xdr_stream *xdr,
150 const struct nfsd4_session *session)
151{
152 __be32 *p;
153
154 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN);
155 xdr_encode_opaque_fixed(p, session->se_sessionid.data,
156 NFS4_MAX_SESSIONID_LEN);
157}
158
159
160
161
162static const struct {
163 int stat;
164 int errno;
165} nfs_cb_errtbl[] = {
166 { NFS4_OK, 0 },
167 { NFS4ERR_PERM, -EPERM },
168 { NFS4ERR_NOENT, -ENOENT },
169 { NFS4ERR_IO, -EIO },
170 { NFS4ERR_NXIO, -ENXIO },
171 { NFS4ERR_ACCESS, -EACCES },
172 { NFS4ERR_EXIST, -EEXIST },
173 { NFS4ERR_XDEV, -EXDEV },
174 { NFS4ERR_NOTDIR, -ENOTDIR },
175 { NFS4ERR_ISDIR, -EISDIR },
176 { NFS4ERR_INVAL, -EINVAL },
177 { NFS4ERR_FBIG, -EFBIG },
178 { NFS4ERR_NOSPC, -ENOSPC },
179 { NFS4ERR_ROFS, -EROFS },
180 { NFS4ERR_MLINK, -EMLINK },
181 { NFS4ERR_NAMETOOLONG, -ENAMETOOLONG },
182 { NFS4ERR_NOTEMPTY, -ENOTEMPTY },
183 { NFS4ERR_DQUOT, -EDQUOT },
184 { NFS4ERR_STALE, -ESTALE },
185 { NFS4ERR_BADHANDLE, -EBADHANDLE },
186 { NFS4ERR_BAD_COOKIE, -EBADCOOKIE },
187 { NFS4ERR_NOTSUPP, -ENOTSUPP },
188 { NFS4ERR_TOOSMALL, -ETOOSMALL },
189 { NFS4ERR_SERVERFAULT, -ESERVERFAULT },
190 { NFS4ERR_BADTYPE, -EBADTYPE },
191 { NFS4ERR_LOCKED, -EAGAIN },
192 { NFS4ERR_RESOURCE, -EREMOTEIO },
193 { NFS4ERR_SYMLINK, -ELOOP },
194 { NFS4ERR_OP_ILLEGAL, -EOPNOTSUPP },
195 { NFS4ERR_DEADLOCK, -EDEADLK },
196 { -1, -EIO }
197};
198
199
200
201
202
203
204
205
206static int nfs_cb_stat_to_errno(int status)
207{
208 int i;
209
210 for (i = 0; nfs_cb_errtbl[i].stat != -1; i++) {
211 if (nfs_cb_errtbl[i].stat == status)
212 return nfs_cb_errtbl[i].errno;
213 }
214
215 dprintk("NFSD: Unrecognized NFS CB status value: %u\n", status);
216 return -status;
217}
218
219static int decode_cb_op_status(struct xdr_stream *xdr,
220 enum nfs_cb_opnum4 expected, int *status)
221{
222 __be32 *p;
223 u32 op;
224
225 p = xdr_inline_decode(xdr, 4 + 4);
226 if (unlikely(p == NULL))
227 goto out_overflow;
228 op = be32_to_cpup(p++);
229 if (unlikely(op != expected))
230 goto out_unexpected;
231 *status = nfs_cb_stat_to_errno(be32_to_cpup(p));
232 return 0;
233out_overflow:
234 return -EIO;
235out_unexpected:
236 dprintk("NFSD: Callback server returned operation %d but "
237 "we issued a request for %d\n", op, expected);
238 return -EIO;
239}
240
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249
250
251static void encode_cb_compound4args(struct xdr_stream *xdr,
252 struct nfs4_cb_compound_hdr *hdr)
253{
254 __be32 * p;
255
256 p = xdr_reserve_space(xdr, 4 + 4 + 4 + 4);
257 p = xdr_encode_empty_array(p);
258 *p++ = cpu_to_be32(hdr->minorversion);
259 *p++ = cpu_to_be32(hdr->ident);
260
261 hdr->nops_p = p;
262 *p = cpu_to_be32(hdr->nops);
263}
264
265
266
267
268static void encode_cb_nops(struct nfs4_cb_compound_hdr *hdr)
269{
270 BUG_ON(hdr->nops > NFS4_MAX_BACK_CHANNEL_OPS);
271 *hdr->nops_p = cpu_to_be32(hdr->nops);
272}
273
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281
282
283static int decode_cb_compound4res(struct xdr_stream *xdr,
284 struct nfs4_cb_compound_hdr *hdr)
285{
286 u32 length;
287 __be32 *p;
288
289 p = xdr_inline_decode(xdr, 4 + 4);
290 if (unlikely(p == NULL))
291 goto out_overflow;
292 hdr->status = be32_to_cpup(p++);
293
294 length = be32_to_cpup(p++);
295 p = xdr_inline_decode(xdr, length + 4);
296 if (unlikely(p == NULL))
297 goto out_overflow;
298 p += XDR_QUADLEN(length);
299 hdr->nops = be32_to_cpup(p);
300 return 0;
301out_overflow:
302 return -EIO;
303}
304
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312
313
314static void encode_cb_recall4args(struct xdr_stream *xdr,
315 const struct nfs4_delegation *dp,
316 struct nfs4_cb_compound_hdr *hdr)
317{
318 __be32 *p;
319
320 encode_nfs_cb_opnum4(xdr, OP_CB_RECALL);
321 encode_stateid4(xdr, &dp->dl_stid.sc_stateid);
322
323 p = xdr_reserve_space(xdr, 4);
324 *p++ = xdr_zero;
325
326 encode_nfs_fh4(xdr, &dp->dl_stid.sc_file->fi_fhandle);
327
328 hdr->nops++;
329}
330
331
332
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335
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340
341
342
343static void encode_cb_sequence4args(struct xdr_stream *xdr,
344 const struct nfsd4_callback *cb,
345 struct nfs4_cb_compound_hdr *hdr)
346{
347 struct nfsd4_session *session = cb->cb_clp->cl_cb_session;
348 __be32 *p;
349
350 if (hdr->minorversion == 0)
351 return;
352
353 encode_nfs_cb_opnum4(xdr, OP_CB_SEQUENCE);
354 encode_sessionid4(xdr, session);
355
356 p = xdr_reserve_space(xdr, 4 + 4 + 4 + 4 + 4);
357 *p++ = cpu_to_be32(session->se_cb_seq_nr);
358 *p++ = xdr_zero;
359 *p++ = xdr_zero;
360 *p++ = xdr_zero;
361 xdr_encode_empty_array(p);
362
363 hdr->nops++;
364}
365
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386
387static int decode_cb_sequence4resok(struct xdr_stream *xdr,
388 struct nfsd4_callback *cb)
389{
390 struct nfsd4_session *session = cb->cb_clp->cl_cb_session;
391 int status = -ESERVERFAULT;
392 __be32 *p;
393 u32 dummy;
394
395
396
397
398
399 p = xdr_inline_decode(xdr, NFS4_MAX_SESSIONID_LEN + 4 + 4 + 4 + 4);
400 if (unlikely(p == NULL))
401 goto out_overflow;
402
403 if (memcmp(p, session->se_sessionid.data, NFS4_MAX_SESSIONID_LEN)) {
404 dprintk("NFS: %s Invalid session id\n", __func__);
405 goto out;
406 }
407 p += XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN);
408
409 dummy = be32_to_cpup(p++);
410 if (dummy != session->se_cb_seq_nr) {
411 dprintk("NFS: %s Invalid sequence number\n", __func__);
412 goto out;
413 }
414
415 dummy = be32_to_cpup(p++);
416 if (dummy != 0) {
417 dprintk("NFS: %s Invalid slotid\n", __func__);
418 goto out;
419 }
420
421
422
423
424 status = 0;
425out:
426 cb->cb_seq_status = status;
427 return status;
428out_overflow:
429 status = -EIO;
430 goto out;
431}
432
433static int decode_cb_sequence4res(struct xdr_stream *xdr,
434 struct nfsd4_callback *cb)
435{
436 int status;
437
438 if (cb->cb_clp->cl_minorversion == 0)
439 return 0;
440
441 status = decode_cb_op_status(xdr, OP_CB_SEQUENCE, &cb->cb_seq_status);
442 if (unlikely(status || cb->cb_seq_status))
443 return status;
444
445 return decode_cb_sequence4resok(xdr, cb);
446}
447
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458
459
460static void nfs4_xdr_enc_cb_null(struct rpc_rqst *req, struct xdr_stream *xdr,
461 const void *__unused)
462{
463 xdr_reserve_space(xdr, 0);
464}
465
466
467
468
469static void nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, struct xdr_stream *xdr,
470 const void *data)
471{
472 const struct nfsd4_callback *cb = data;
473 const struct nfs4_delegation *dp = cb_to_delegation(cb);
474 struct nfs4_cb_compound_hdr hdr = {
475 .ident = cb->cb_clp->cl_cb_ident,
476 .minorversion = cb->cb_clp->cl_minorversion,
477 };
478
479 encode_cb_compound4args(xdr, &hdr);
480 encode_cb_sequence4args(xdr, cb, &hdr);
481 encode_cb_recall4args(xdr, dp, &hdr);
482 encode_cb_nops(&hdr);
483}
484
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493
494
495static int nfs4_xdr_dec_cb_null(struct rpc_rqst *req, struct xdr_stream *xdr,
496 void *__unused)
497{
498 return 0;
499}
500
501
502
503
504static int nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp,
505 struct xdr_stream *xdr,
506 void *data)
507{
508 struct nfsd4_callback *cb = data;
509 struct nfs4_cb_compound_hdr hdr;
510 int status;
511
512 status = decode_cb_compound4res(xdr, &hdr);
513 if (unlikely(status))
514 return status;
515
516 status = decode_cb_sequence4res(xdr, cb);
517 if (unlikely(status || cb->cb_seq_status))
518 return status;
519
520 return decode_cb_op_status(xdr, OP_CB_RECALL, &cb->cb_status);
521}
522
523#ifdef CONFIG_NFSD_PNFS
524
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549
550static void encode_cb_layout4args(struct xdr_stream *xdr,
551 const struct nfs4_layout_stateid *ls,
552 struct nfs4_cb_compound_hdr *hdr)
553{
554 __be32 *p;
555
556 BUG_ON(hdr->minorversion == 0);
557
558 p = xdr_reserve_space(xdr, 5 * 4);
559 *p++ = cpu_to_be32(OP_CB_LAYOUTRECALL);
560 *p++ = cpu_to_be32(ls->ls_layout_type);
561 *p++ = cpu_to_be32(IOMODE_ANY);
562 *p++ = cpu_to_be32(1);
563 *p = cpu_to_be32(RETURN_FILE);
564
565 encode_nfs_fh4(xdr, &ls->ls_stid.sc_file->fi_fhandle);
566
567 p = xdr_reserve_space(xdr, 2 * 8);
568 p = xdr_encode_hyper(p, 0);
569 xdr_encode_hyper(p, NFS4_MAX_UINT64);
570
571 encode_stateid4(xdr, &ls->ls_recall_sid);
572
573 hdr->nops++;
574}
575
576static void nfs4_xdr_enc_cb_layout(struct rpc_rqst *req,
577 struct xdr_stream *xdr,
578 const void *data)
579{
580 const struct nfsd4_callback *cb = data;
581 const struct nfs4_layout_stateid *ls =
582 container_of(cb, struct nfs4_layout_stateid, ls_recall);
583 struct nfs4_cb_compound_hdr hdr = {
584 .ident = 0,
585 .minorversion = cb->cb_clp->cl_minorversion,
586 };
587
588 encode_cb_compound4args(xdr, &hdr);
589 encode_cb_sequence4args(xdr, cb, &hdr);
590 encode_cb_layout4args(xdr, ls, &hdr);
591 encode_cb_nops(&hdr);
592}
593
594static int nfs4_xdr_dec_cb_layout(struct rpc_rqst *rqstp,
595 struct xdr_stream *xdr,
596 void *data)
597{
598 struct nfsd4_callback *cb = data;
599 struct nfs4_cb_compound_hdr hdr;
600 int status;
601
602 status = decode_cb_compound4res(xdr, &hdr);
603 if (unlikely(status))
604 return status;
605
606 status = decode_cb_sequence4res(xdr, cb);
607 if (unlikely(status || cb->cb_seq_status))
608 return status;
609
610 return decode_cb_op_status(xdr, OP_CB_LAYOUTRECALL, &cb->cb_status);
611}
612#endif
613
614static void encode_stateowner(struct xdr_stream *xdr, struct nfs4_stateowner *so)
615{
616 __be32 *p;
617
618 p = xdr_reserve_space(xdr, 8 + 4 + so->so_owner.len);
619 p = xdr_encode_opaque_fixed(p, &so->so_client->cl_clientid, 8);
620 xdr_encode_opaque(p, so->so_owner.data, so->so_owner.len);
621}
622
623static void nfs4_xdr_enc_cb_notify_lock(struct rpc_rqst *req,
624 struct xdr_stream *xdr,
625 const void *data)
626{
627 const struct nfsd4_callback *cb = data;
628 const struct nfsd4_blocked_lock *nbl =
629 container_of(cb, struct nfsd4_blocked_lock, nbl_cb);
630 struct nfs4_lockowner *lo = (struct nfs4_lockowner *)nbl->nbl_lock.fl_owner;
631 struct nfs4_cb_compound_hdr hdr = {
632 .ident = 0,
633 .minorversion = cb->cb_clp->cl_minorversion,
634 };
635
636 __be32 *p;
637
638 BUG_ON(hdr.minorversion == 0);
639
640 encode_cb_compound4args(xdr, &hdr);
641 encode_cb_sequence4args(xdr, cb, &hdr);
642
643 p = xdr_reserve_space(xdr, 4);
644 *p = cpu_to_be32(OP_CB_NOTIFY_LOCK);
645 encode_nfs_fh4(xdr, &nbl->nbl_fh);
646 encode_stateowner(xdr, &lo->lo_owner);
647 hdr.nops++;
648
649 encode_cb_nops(&hdr);
650}
651
652static int nfs4_xdr_dec_cb_notify_lock(struct rpc_rqst *rqstp,
653 struct xdr_stream *xdr,
654 void *data)
655{
656 struct nfsd4_callback *cb = data;
657 struct nfs4_cb_compound_hdr hdr;
658 int status;
659
660 status = decode_cb_compound4res(xdr, &hdr);
661 if (unlikely(status))
662 return status;
663
664 status = decode_cb_sequence4res(xdr, cb);
665 if (unlikely(status || cb->cb_seq_status))
666 return status;
667
668 return decode_cb_op_status(xdr, OP_CB_NOTIFY_LOCK, &cb->cb_status);
669}
670
671
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676
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688
689
690static void encode_offload_info4(struct xdr_stream *xdr,
691 __be32 nfserr,
692 const struct nfsd4_copy *cp)
693{
694 __be32 *p;
695
696 p = xdr_reserve_space(xdr, 4);
697 *p++ = nfserr;
698 if (!nfserr) {
699 p = xdr_reserve_space(xdr, 4 + 8 + 4 + NFS4_VERIFIER_SIZE);
700 p = xdr_encode_empty_array(p);
701 p = xdr_encode_hyper(p, cp->cp_res.wr_bytes_written);
702 *p++ = cpu_to_be32(cp->cp_res.wr_stable_how);
703 p = xdr_encode_opaque_fixed(p, cp->cp_res.wr_verifier.data,
704 NFS4_VERIFIER_SIZE);
705 } else {
706 p = xdr_reserve_space(xdr, 8);
707
708 p = xdr_encode_hyper(p, 0);
709 }
710}
711
712static void encode_cb_offload4args(struct xdr_stream *xdr,
713 __be32 nfserr,
714 const struct knfsd_fh *fh,
715 const struct nfsd4_copy *cp,
716 struct nfs4_cb_compound_hdr *hdr)
717{
718 __be32 *p;
719
720 p = xdr_reserve_space(xdr, 4);
721 *p++ = cpu_to_be32(OP_CB_OFFLOAD);
722 encode_nfs_fh4(xdr, fh);
723 encode_stateid4(xdr, &cp->cp_res.cb_stateid);
724 encode_offload_info4(xdr, nfserr, cp);
725
726 hdr->nops++;
727}
728
729static void nfs4_xdr_enc_cb_offload(struct rpc_rqst *req,
730 struct xdr_stream *xdr,
731 const void *data)
732{
733 const struct nfsd4_callback *cb = data;
734 const struct nfsd4_copy *cp =
735 container_of(cb, struct nfsd4_copy, cp_cb);
736 struct nfs4_cb_compound_hdr hdr = {
737 .ident = 0,
738 .minorversion = cb->cb_clp->cl_minorversion,
739 };
740
741 encode_cb_compound4args(xdr, &hdr);
742 encode_cb_sequence4args(xdr, cb, &hdr);
743 encode_cb_offload4args(xdr, cp->nfserr, &cp->fh, cp, &hdr);
744 encode_cb_nops(&hdr);
745}
746
747static int nfs4_xdr_dec_cb_offload(struct rpc_rqst *rqstp,
748 struct xdr_stream *xdr,
749 void *data)
750{
751 struct nfsd4_callback *cb = data;
752 struct nfs4_cb_compound_hdr hdr;
753 int status;
754
755 status = decode_cb_compound4res(xdr, &hdr);
756 if (unlikely(status))
757 return status;
758
759 status = decode_cb_sequence4res(xdr, cb);
760 if (unlikely(status || cb->cb_seq_status))
761 return status;
762
763 return decode_cb_op_status(xdr, OP_CB_OFFLOAD, &cb->cb_status);
764}
765
766
767
768#define PROC(proc, call, argtype, restype) \
769[NFSPROC4_CLNT_##proc] = { \
770 .p_proc = NFSPROC4_CB_##call, \
771 .p_encode = nfs4_xdr_enc_##argtype, \
772 .p_decode = nfs4_xdr_dec_##restype, \
773 .p_arglen = NFS4_enc_##argtype##_sz, \
774 .p_replen = NFS4_dec_##restype##_sz, \
775 .p_statidx = NFSPROC4_CB_##call, \
776 .p_name = #proc, \
777}
778
779static const struct rpc_procinfo nfs4_cb_procedures[] = {
780 PROC(CB_NULL, NULL, cb_null, cb_null),
781 PROC(CB_RECALL, COMPOUND, cb_recall, cb_recall),
782#ifdef CONFIG_NFSD_PNFS
783 PROC(CB_LAYOUT, COMPOUND, cb_layout, cb_layout),
784#endif
785 PROC(CB_NOTIFY_LOCK, COMPOUND, cb_notify_lock, cb_notify_lock),
786 PROC(CB_OFFLOAD, COMPOUND, cb_offload, cb_offload),
787};
788
789static unsigned int nfs4_cb_counts[ARRAY_SIZE(nfs4_cb_procedures)];
790static const struct rpc_version nfs_cb_version4 = {
791
792
793
794
795
796
797
798 .number = 1,
799 .nrprocs = ARRAY_SIZE(nfs4_cb_procedures),
800 .procs = nfs4_cb_procedures,
801 .counts = nfs4_cb_counts,
802};
803
804static const struct rpc_version *nfs_cb_version[2] = {
805 [1] = &nfs_cb_version4,
806};
807
808static const struct rpc_program cb_program;
809
810static struct rpc_stat cb_stats = {
811 .program = &cb_program
812};
813
814#define NFS4_CALLBACK 0x40000000
815static const struct rpc_program cb_program = {
816 .name = "nfs4_cb",
817 .number = NFS4_CALLBACK,
818 .nrvers = ARRAY_SIZE(nfs_cb_version),
819 .version = nfs_cb_version,
820 .stats = &cb_stats,
821 .pipe_dir_name = "nfsd4_cb",
822};
823
824static int max_cb_time(struct net *net)
825{
826 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
827
828
829
830
831
832
833 if (WARN_ON_ONCE(nn->nfsd4_lease > 3600))
834 return 360 * HZ;
835
836 return max(((u32)nn->nfsd4_lease)/10, 1u) * HZ;
837}
838
839static struct workqueue_struct *callback_wq;
840
841static bool nfsd4_queue_cb(struct nfsd4_callback *cb)
842{
843 return queue_work(callback_wq, &cb->cb_work);
844}
845
846static void nfsd41_cb_inflight_begin(struct nfs4_client *clp)
847{
848 atomic_inc(&clp->cl_cb_inflight);
849}
850
851static void nfsd41_cb_inflight_end(struct nfs4_client *clp)
852{
853
854 if (atomic_dec_and_test(&clp->cl_cb_inflight))
855 wake_up_var(&clp->cl_cb_inflight);
856}
857
858static void nfsd41_cb_inflight_wait_complete(struct nfs4_client *clp)
859{
860 wait_var_event(&clp->cl_cb_inflight,
861 !atomic_read(&clp->cl_cb_inflight));
862}
863
864static const struct cred *get_backchannel_cred(struct nfs4_client *clp, struct rpc_clnt *client, struct nfsd4_session *ses)
865{
866 if (clp->cl_minorversion == 0) {
867 client->cl_principal = clp->cl_cred.cr_targ_princ ?
868 clp->cl_cred.cr_targ_princ : "nfs";
869
870 return get_cred(rpc_machine_cred());
871 } else {
872 struct cred *kcred;
873
874 kcred = prepare_kernel_cred(NULL);
875 if (!kcred)
876 return NULL;
877
878 kcred->uid = ses->se_cb_sec.uid;
879 kcred->gid = ses->se_cb_sec.gid;
880 return kcred;
881 }
882}
883
884static int setup_callback_client(struct nfs4_client *clp, struct nfs4_cb_conn *conn, struct nfsd4_session *ses)
885{
886 int maxtime = max_cb_time(clp->net);
887 struct rpc_timeout timeparms = {
888 .to_initval = maxtime,
889 .to_retries = 0,
890 .to_maxval = maxtime,
891 };
892 struct rpc_create_args args = {
893 .net = clp->net,
894 .address = (struct sockaddr *) &conn->cb_addr,
895 .addrsize = conn->cb_addrlen,
896 .saddress = (struct sockaddr *) &conn->cb_saddr,
897 .timeout = &timeparms,
898 .program = &cb_program,
899 .version = 1,
900 .flags = (RPC_CLNT_CREATE_NOPING | RPC_CLNT_CREATE_QUIET),
901 .cred = current_cred(),
902 };
903 struct rpc_clnt *client;
904 const struct cred *cred;
905
906 if (clp->cl_minorversion == 0) {
907 if (!clp->cl_cred.cr_principal &&
908 (clp->cl_cred.cr_flavor >= RPC_AUTH_GSS_KRB5)) {
909 trace_nfsd_cb_setup_err(clp, -EINVAL);
910 return -EINVAL;
911 }
912 args.client_name = clp->cl_cred.cr_principal;
913 args.prognumber = conn->cb_prog;
914 args.protocol = XPRT_TRANSPORT_TCP;
915 args.authflavor = clp->cl_cred.cr_flavor;
916 clp->cl_cb_ident = conn->cb_ident;
917 } else {
918 if (!conn->cb_xprt)
919 return -EINVAL;
920 clp->cl_cb_conn.cb_xprt = conn->cb_xprt;
921 clp->cl_cb_session = ses;
922 args.bc_xprt = conn->cb_xprt;
923 args.prognumber = clp->cl_cb_session->se_cb_prog;
924 args.protocol = conn->cb_xprt->xpt_class->xcl_ident |
925 XPRT_TRANSPORT_BC;
926 args.authflavor = ses->se_cb_sec.flavor;
927 }
928
929 client = rpc_create(&args);
930 if (IS_ERR(client)) {
931 trace_nfsd_cb_setup_err(clp, PTR_ERR(client));
932 return PTR_ERR(client);
933 }
934 cred = get_backchannel_cred(clp, client, ses);
935 if (!cred) {
936 trace_nfsd_cb_setup_err(clp, -ENOMEM);
937 rpc_shutdown_client(client);
938 return -ENOMEM;
939 }
940 clp->cl_cb_client = client;
941 clp->cl_cb_cred = cred;
942 rcu_read_lock();
943 trace_nfsd_cb_setup(clp, rpc_peeraddr2str(client, RPC_DISPLAY_NETID),
944 args.authflavor);
945 rcu_read_unlock();
946 return 0;
947}
948
949static void nfsd4_mark_cb_state(struct nfs4_client *clp, int newstate)
950{
951 if (clp->cl_cb_state != newstate) {
952 clp->cl_cb_state = newstate;
953 trace_nfsd_cb_state(clp);
954 }
955}
956
957static void nfsd4_mark_cb_down(struct nfs4_client *clp, int reason)
958{
959 if (test_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags))
960 return;
961 nfsd4_mark_cb_state(clp, NFSD4_CB_DOWN);
962}
963
964static void nfsd4_mark_cb_fault(struct nfs4_client *clp, int reason)
965{
966 if (test_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags))
967 return;
968 nfsd4_mark_cb_state(clp, NFSD4_CB_FAULT);
969}
970
971static void nfsd4_cb_probe_done(struct rpc_task *task, void *calldata)
972{
973 struct nfs4_client *clp = container_of(calldata, struct nfs4_client, cl_cb_null);
974
975 if (task->tk_status)
976 nfsd4_mark_cb_down(clp, task->tk_status);
977 else
978 nfsd4_mark_cb_state(clp, NFSD4_CB_UP);
979}
980
981static void nfsd4_cb_probe_release(void *calldata)
982{
983 struct nfs4_client *clp = container_of(calldata, struct nfs4_client, cl_cb_null);
984
985 nfsd41_cb_inflight_end(clp);
986
987}
988
989static const struct rpc_call_ops nfsd4_cb_probe_ops = {
990
991
992 .rpc_call_done = nfsd4_cb_probe_done,
993 .rpc_release = nfsd4_cb_probe_release,
994};
995
996
997
998
999
1000void nfsd4_probe_callback(struct nfs4_client *clp)
1001{
1002 trace_nfsd_cb_probe(clp);
1003 nfsd4_mark_cb_state(clp, NFSD4_CB_UNKNOWN);
1004 set_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags);
1005 nfsd4_run_cb(&clp->cl_cb_null);
1006}
1007
1008void nfsd4_probe_callback_sync(struct nfs4_client *clp)
1009{
1010 nfsd4_probe_callback(clp);
1011 flush_workqueue(callback_wq);
1012}
1013
1014void nfsd4_change_callback(struct nfs4_client *clp, struct nfs4_cb_conn *conn)
1015{
1016 nfsd4_mark_cb_state(clp, NFSD4_CB_UNKNOWN);
1017 spin_lock(&clp->cl_lock);
1018 memcpy(&clp->cl_cb_conn, conn, sizeof(struct nfs4_cb_conn));
1019 spin_unlock(&clp->cl_lock);
1020}
1021
1022
1023
1024
1025
1026
1027static bool nfsd41_cb_get_slot(struct nfsd4_callback *cb, struct rpc_task *task)
1028{
1029 struct nfs4_client *clp = cb->cb_clp;
1030
1031 if (!cb->cb_holds_slot &&
1032 test_and_set_bit(0, &clp->cl_cb_slot_busy) != 0) {
1033 rpc_sleep_on(&clp->cl_cb_waitq, task, NULL);
1034
1035 if (test_and_set_bit(0, &clp->cl_cb_slot_busy) != 0) {
1036 dprintk("%s slot is busy\n", __func__);
1037 return false;
1038 }
1039 rpc_wake_up_queued_task(&clp->cl_cb_waitq, task);
1040 }
1041 cb->cb_holds_slot = true;
1042 return true;
1043}
1044
1045static void nfsd41_cb_release_slot(struct nfsd4_callback *cb)
1046{
1047 struct nfs4_client *clp = cb->cb_clp;
1048
1049 if (cb->cb_holds_slot) {
1050 cb->cb_holds_slot = false;
1051 clear_bit(0, &clp->cl_cb_slot_busy);
1052 rpc_wake_up_next(&clp->cl_cb_waitq);
1053 }
1054}
1055
1056static void nfsd41_destroy_cb(struct nfsd4_callback *cb)
1057{
1058 struct nfs4_client *clp = cb->cb_clp;
1059
1060 nfsd41_cb_release_slot(cb);
1061 if (cb->cb_ops && cb->cb_ops->release)
1062 cb->cb_ops->release(cb);
1063 nfsd41_cb_inflight_end(clp);
1064}
1065
1066
1067
1068
1069
1070static void nfsd4_cb_prepare(struct rpc_task *task, void *calldata)
1071{
1072 struct nfsd4_callback *cb = calldata;
1073 struct nfs4_client *clp = cb->cb_clp;
1074 u32 minorversion = clp->cl_minorversion;
1075
1076
1077
1078
1079
1080 cb->cb_seq_status = 1;
1081 cb->cb_status = 0;
1082 if (minorversion && !nfsd41_cb_get_slot(cb, task))
1083 return;
1084 rpc_call_start(task);
1085}
1086
1087static bool nfsd4_cb_sequence_done(struct rpc_task *task, struct nfsd4_callback *cb)
1088{
1089 struct nfs4_client *clp = cb->cb_clp;
1090 struct nfsd4_session *session = clp->cl_cb_session;
1091 bool ret = true;
1092
1093 if (!clp->cl_minorversion) {
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103 if (RPC_SIGNALLED(task))
1104 goto need_restart;
1105
1106 return true;
1107 }
1108
1109 if (!cb->cb_holds_slot)
1110 goto need_restart;
1111
1112 switch (cb->cb_seq_status) {
1113 case 0:
1114
1115
1116
1117
1118
1119
1120
1121 ++session->se_cb_seq_nr;
1122 break;
1123 case -ESERVERFAULT:
1124 ++session->se_cb_seq_nr;
1125 fallthrough;
1126 case 1:
1127 case -NFS4ERR_BADSESSION:
1128 nfsd4_mark_cb_fault(cb->cb_clp, cb->cb_seq_status);
1129 ret = false;
1130 break;
1131 case -NFS4ERR_DELAY:
1132 if (!rpc_restart_call(task))
1133 goto out;
1134
1135 rpc_delay(task, 2 * HZ);
1136 return false;
1137 case -NFS4ERR_BADSLOT:
1138 goto retry_nowait;
1139 case -NFS4ERR_SEQ_MISORDERED:
1140 if (session->se_cb_seq_nr != 1) {
1141 session->se_cb_seq_nr = 1;
1142 goto retry_nowait;
1143 }
1144 break;
1145 default:
1146 nfsd4_mark_cb_fault(cb->cb_clp, cb->cb_seq_status);
1147 dprintk("%s: unprocessed error %d\n", __func__,
1148 cb->cb_seq_status);
1149 }
1150
1151 nfsd41_cb_release_slot(cb);
1152 dprintk("%s: freed slot, new seqid=%d\n", __func__,
1153 clp->cl_cb_session->se_cb_seq_nr);
1154
1155 if (RPC_SIGNALLED(task))
1156 goto need_restart;
1157out:
1158 return ret;
1159retry_nowait:
1160 if (rpc_restart_call_prepare(task))
1161 ret = false;
1162 goto out;
1163need_restart:
1164 if (!test_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags)) {
1165 task->tk_status = 0;
1166 cb->cb_need_restart = true;
1167 }
1168 return false;
1169}
1170
1171static void nfsd4_cb_done(struct rpc_task *task, void *calldata)
1172{
1173 struct nfsd4_callback *cb = calldata;
1174 struct nfs4_client *clp = cb->cb_clp;
1175
1176 if (!nfsd4_cb_sequence_done(task, cb))
1177 return;
1178
1179 if (cb->cb_status) {
1180 WARN_ON_ONCE(task->tk_status);
1181 task->tk_status = cb->cb_status;
1182 }
1183
1184 switch (cb->cb_ops->done(cb, task)) {
1185 case 0:
1186 task->tk_status = 0;
1187 rpc_restart_call_prepare(task);
1188 return;
1189 case 1:
1190 switch (task->tk_status) {
1191 case -EIO:
1192 case -ETIMEDOUT:
1193 case -EACCES:
1194 nfsd4_mark_cb_down(clp, task->tk_status);
1195 }
1196 break;
1197 default:
1198 BUG();
1199 }
1200}
1201
1202static void nfsd4_cb_release(void *calldata)
1203{
1204 struct nfsd4_callback *cb = calldata;
1205
1206 if (cb->cb_need_restart)
1207 nfsd4_queue_cb(cb);
1208 else
1209 nfsd41_destroy_cb(cb);
1210
1211}
1212
1213static const struct rpc_call_ops nfsd4_cb_ops = {
1214 .rpc_call_prepare = nfsd4_cb_prepare,
1215 .rpc_call_done = nfsd4_cb_done,
1216 .rpc_release = nfsd4_cb_release,
1217};
1218
1219int nfsd4_create_callback_queue(void)
1220{
1221 callback_wq = alloc_ordered_workqueue("nfsd4_callbacks", 0);
1222 if (!callback_wq)
1223 return -ENOMEM;
1224 return 0;
1225}
1226
1227void nfsd4_destroy_callback_queue(void)
1228{
1229 destroy_workqueue(callback_wq);
1230}
1231
1232
1233void nfsd4_shutdown_callback(struct nfs4_client *clp)
1234{
1235 if (clp->cl_cb_state != NFSD4_CB_UNKNOWN)
1236 trace_nfsd_cb_shutdown(clp);
1237
1238 set_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags);
1239
1240
1241
1242
1243
1244 nfsd4_run_cb(&clp->cl_cb_null);
1245 flush_workqueue(callback_wq);
1246 nfsd41_cb_inflight_wait_complete(clp);
1247}
1248
1249
1250static struct nfsd4_conn * __nfsd4_find_backchannel(struct nfs4_client *clp)
1251{
1252 struct nfsd4_session *s;
1253 struct nfsd4_conn *c;
1254
1255 list_for_each_entry(s, &clp->cl_sessions, se_perclnt) {
1256 list_for_each_entry(c, &s->se_conns, cn_persession) {
1257 if (c->cn_flags & NFS4_CDFC4_BACK)
1258 return c;
1259 }
1260 }
1261 return NULL;
1262}
1263
1264
1265
1266
1267
1268
1269
1270static void nfsd4_process_cb_update(struct nfsd4_callback *cb)
1271{
1272 struct nfs4_cb_conn conn;
1273 struct nfs4_client *clp = cb->cb_clp;
1274 struct nfsd4_session *ses = NULL;
1275 struct nfsd4_conn *c;
1276 int err;
1277
1278
1279
1280
1281
1282 if (clp->cl_cb_client) {
1283 rpc_shutdown_client(clp->cl_cb_client);
1284 clp->cl_cb_client = NULL;
1285 put_cred(clp->cl_cb_cred);
1286 clp->cl_cb_cred = NULL;
1287 }
1288 if (clp->cl_cb_conn.cb_xprt) {
1289 svc_xprt_put(clp->cl_cb_conn.cb_xprt);
1290 clp->cl_cb_conn.cb_xprt = NULL;
1291 }
1292 if (test_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags))
1293 return;
1294 spin_lock(&clp->cl_lock);
1295
1296
1297
1298
1299 BUG_ON(!(clp->cl_flags & NFSD4_CLIENT_CB_FLAG_MASK));
1300 clear_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags);
1301 memcpy(&conn, &cb->cb_clp->cl_cb_conn, sizeof(struct nfs4_cb_conn));
1302 c = __nfsd4_find_backchannel(clp);
1303 if (c) {
1304 svc_xprt_get(c->cn_xprt);
1305 conn.cb_xprt = c->cn_xprt;
1306 ses = c->cn_session;
1307 }
1308 spin_unlock(&clp->cl_lock);
1309
1310 err = setup_callback_client(clp, &conn, ses);
1311 if (err) {
1312 nfsd4_mark_cb_down(clp, err);
1313 if (c)
1314 svc_xprt_put(c->cn_xprt);
1315 return;
1316 }
1317}
1318
1319static void
1320nfsd4_run_cb_work(struct work_struct *work)
1321{
1322 struct nfsd4_callback *cb =
1323 container_of(work, struct nfsd4_callback, cb_work);
1324 struct nfs4_client *clp = cb->cb_clp;
1325 struct rpc_clnt *clnt;
1326 int flags;
1327
1328 if (cb->cb_need_restart) {
1329 cb->cb_need_restart = false;
1330 } else {
1331 if (cb->cb_ops && cb->cb_ops->prepare)
1332 cb->cb_ops->prepare(cb);
1333 }
1334
1335 if (clp->cl_flags & NFSD4_CLIENT_CB_FLAG_MASK)
1336 nfsd4_process_cb_update(cb);
1337
1338 clnt = clp->cl_cb_client;
1339 if (!clnt) {
1340
1341 nfsd41_destroy_cb(cb);
1342 return;
1343 }
1344
1345
1346
1347
1348 if (!cb->cb_ops && clp->cl_minorversion) {
1349 nfsd4_mark_cb_state(clp, NFSD4_CB_UP);
1350 nfsd41_destroy_cb(cb);
1351 return;
1352 }
1353
1354 cb->cb_msg.rpc_cred = clp->cl_cb_cred;
1355 flags = clp->cl_minorversion ? RPC_TASK_NOCONNECT : RPC_TASK_SOFTCONN;
1356 rpc_call_async(clnt, &cb->cb_msg, RPC_TASK_SOFT | flags,
1357 cb->cb_ops ? &nfsd4_cb_ops : &nfsd4_cb_probe_ops, cb);
1358}
1359
1360void nfsd4_init_cb(struct nfsd4_callback *cb, struct nfs4_client *clp,
1361 const struct nfsd4_callback_ops *ops, enum nfsd4_cb_op op)
1362{
1363 cb->cb_clp = clp;
1364 cb->cb_msg.rpc_proc = &nfs4_cb_procedures[op];
1365 cb->cb_msg.rpc_argp = cb;
1366 cb->cb_msg.rpc_resp = cb;
1367 cb->cb_ops = ops;
1368 INIT_WORK(&cb->cb_work, nfsd4_run_cb_work);
1369 cb->cb_seq_status = 1;
1370 cb->cb_status = 0;
1371 cb->cb_need_restart = false;
1372 cb->cb_holds_slot = false;
1373}
1374
1375void nfsd4_run_cb(struct nfsd4_callback *cb)
1376{
1377 struct nfs4_client *clp = cb->cb_clp;
1378
1379 nfsd41_cb_inflight_begin(clp);
1380 if (!nfsd4_queue_cb(cb))
1381 nfsd41_cb_inflight_end(clp);
1382}
1383