summaryrefslogtreecommitdiffstats
path: root/sys/nfsclient/nfs_vfsops.c
blob: 63b5772f35ed8ea46c02da337ce2ccfd647011c6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
/*-
 * Copyright (c) 1989, 1993, 1995
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Rick Macklem at The University of Guelph.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)nfs_vfsops.c	8.12 (Berkeley) 5/20/95
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");


#include "opt_bootp.h"
#include "opt_nfsroot.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/bio.h>
#include <sys/buf.h>
#include <sys/jail.h>
#include <sys/limits.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/module.h>
#include <sys/mount.h>
#include <sys/proc.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sockio.h>
#include <sys/sysctl.h>
#include <sys/syslog.h>
#include <sys/vnode.h>
#include <sys/signalvar.h>

#include <vm/vm.h>
#include <vm/vm_extern.h>
#include <vm/uma.h>

#include <net/if.h>
#include <net/route.h>
#include <net/vnet.h>

#include <netinet/in.h>

#include <rpc/rpc.h>

#include <nfs/nfsproto.h>
#include <nfsclient/nfs.h>
#include <nfsclient/nfsnode.h>
#include <nfsclient/nfsmount.h>
#include <nfs/xdr_subs.h>
#include <nfsclient/nfsm_subs.h>
#include <nfs/nfsdiskless.h>

FEATURE(nfsclient, "NFS client");

MALLOC_DEFINE(M_NFSREQ, "nfsclient_req", "NFS request header");
MALLOC_DEFINE(M_NFSBIGFH, "nfsclient_bigfh", "NFS version 3 file handle");
MALLOC_DEFINE(M_NFSDIROFF, "nfsclient_diroff", "NFS directory offset data");
MALLOC_DEFINE(M_NFSHASH, "nfsclient_hash", "NFS hash tables");
MALLOC_DEFINE(M_NFSDIRECTIO, "nfsclient_directio", "NFS Direct IO async write state");

uma_zone_t nfsmount_zone;

struct nfsstats	nfsstats;

SYSCTL_NODE(_vfs, OID_AUTO, oldnfs, CTLFLAG_RW, 0, "Old NFS filesystem");
SYSCTL_STRUCT(_vfs_oldnfs, NFS_NFSSTATS, nfsstats, CTLFLAG_RW,
	&nfsstats, nfsstats, "S,nfsstats");
static int nfs_ip_paranoia = 1;
SYSCTL_INT(_vfs_oldnfs, OID_AUTO, nfs_ip_paranoia, CTLFLAG_RW,
    &nfs_ip_paranoia, 0,
    "Disallow accepting replies from IPs which differ from those sent");
#ifdef NFS_DEBUG
int nfs_debug;
SYSCTL_INT(_vfs_oldnfs, OID_AUTO, debug, CTLFLAG_RW, &nfs_debug, 0,
    "Toggle debug flag");
#endif
static int nfs_tprintf_initial_delay = NFS_TPRINTF_INITIAL_DELAY;
SYSCTL_INT(_vfs_oldnfs, NFS_TPRINTF_INITIAL_DELAY,
    downdelayinitial, CTLFLAG_RW, &nfs_tprintf_initial_delay, 0,
    "Delay before printing \"nfs server not responding\" messages");
/* how long between console messages "nfs server foo not responding" */
static int nfs_tprintf_delay = NFS_TPRINTF_DELAY;
SYSCTL_INT(_vfs_oldnfs, NFS_TPRINTF_DELAY,
    downdelayinterval, CTLFLAG_RW, &nfs_tprintf_delay, 0,
    "Delay between printing \"nfs server not responding\" messages");

static void	nfs_decode_args(struct mount *mp, struct nfsmount *nmp,
		    struct nfs_args *argp, const char *hostname);
static int	mountnfs(struct nfs_args *, struct mount *,
		    struct sockaddr *, char *, struct vnode **,
		    struct ucred *cred, int, int);
static void	nfs_getnlminfo(struct vnode *, uint8_t *, size_t *,
		    struct sockaddr_storage *, int *, off_t *,
		    struct timeval *);
static vfs_mount_t nfs_mount;
static vfs_cmount_t nfs_cmount;
static vfs_unmount_t nfs_unmount;
static vfs_root_t nfs_root;
static vfs_statfs_t nfs_statfs;
static vfs_sync_t nfs_sync;
static vfs_sysctl_t nfs_sysctl;

static int	fake_wchan;

/*
 * nfs vfs operations.
 */
static struct vfsops nfs_vfsops = {
	.vfs_init =		nfs_init,
	.vfs_mount =		nfs_mount,
	.vfs_cmount =		nfs_cmount,
	.vfs_root =		nfs_root,
	.vfs_statfs =		nfs_statfs,
	.vfs_sync =		nfs_sync,
	.vfs_uninit =		nfs_uninit,
	.vfs_unmount =		nfs_unmount,
	.vfs_sysctl =		nfs_sysctl,
};
VFS_SET(nfs_vfsops, oldnfs, VFCF_NETWORK);

/* So that loader and kldload(2) can find us, wherever we are.. */
MODULE_VERSION(oldnfs, 1);
MODULE_DEPEND(oldnfs, krpc, 1, 1, 1);
#ifdef KGSSAPI
MODULE_DEPEND(oldnfs, kgssapi, 1, 1, 1);
#endif
MODULE_DEPEND(oldnfs, nfs_common, 1, 1, 1);
MODULE_DEPEND(oldnfs, nfslock, 1, 1, 1);

static struct nfs_rpcops nfs_rpcops = {
	nfs_readrpc,
	nfs_writerpc,
	nfs_writebp,
	nfs_readlinkrpc,
	nfs_invaldir,
	nfs_commit,
};

/*
 * This structure is now defined in sys/nfs/nfs_diskless.c so that it
 * can be shared by both NFS clients. It is declared here so that it
 * will be defined for kernels built without NFS_ROOT, although it
 * isn't used in that case.
 */
#ifndef NFS_ROOT
struct nfs_diskless	nfs_diskless = { { { 0 } } };
struct nfsv3_diskless	nfsv3_diskless = { { { 0 } } };
int			nfs_diskless_valid = 0;
#endif

SYSCTL_INT(_vfs_oldnfs, OID_AUTO, diskless_valid, CTLFLAG_RD,
    &nfs_diskless_valid, 0,
    "Has the diskless struct been filled correctly");

SYSCTL_STRING(_vfs_oldnfs, OID_AUTO, diskless_rootpath, CTLFLAG_RD,
    nfsv3_diskless.root_hostnam, 0, "Path to nfs root");

SYSCTL_OPAQUE(_vfs_oldnfs, OID_AUTO, diskless_rootaddr, CTLFLAG_RD,
    &nfsv3_diskless.root_saddr, sizeof nfsv3_diskless.root_saddr,
    "%Ssockaddr_in", "Diskless root nfs address");


void		nfsargs_ntoh(struct nfs_args *);
static int	nfs_mountdiskless(char *,
		    struct sockaddr_in *, struct nfs_args *,
		    struct thread *, struct vnode **, struct mount *);
static void	nfs_convert_diskless(void);
static void	nfs_convert_oargs(struct nfs_args *args,
		    struct onfs_args *oargs);

int
nfs_iosize(struct nfsmount *nmp)
{
	int iosize;

	/*
	 * Calculate the size used for io buffers.  Use the larger
	 * of the two sizes to minimise nfs requests but make sure
	 * that it is at least one VM page to avoid wasting buffer
	 * space.
	 */
	iosize = imax(nmp->nm_rsize, nmp->nm_wsize);
	iosize = imax(iosize, PAGE_SIZE);
	return (iosize);
}

static void
nfs_convert_oargs(struct nfs_args *args, struct onfs_args *oargs)
{

	args->version = NFS_ARGSVERSION;
	args->addr = oargs->addr;
	args->addrlen = oargs->addrlen;
	args->sotype = oargs->sotype;
	args->proto = oargs->proto;
	args->fh = oargs->fh;
	args->fhsize = oargs->fhsize;
	args->flags = oargs->flags;
	args->wsize = oargs->wsize;
	args->rsize = oargs->rsize;
	args->readdirsize = oargs->readdirsize;
	args->timeo = oargs->timeo;
	args->retrans = oargs->retrans;
	args->maxgrouplist = oargs->maxgrouplist;
	args->readahead = oargs->readahead;
	args->deadthresh = oargs->deadthresh;
	args->hostname = oargs->hostname;
}

static void
nfs_convert_diskless(void)
{

	bcopy(&nfs_diskless.myif, &nfsv3_diskless.myif,
		sizeof(struct ifaliasreq));
	bcopy(&nfs_diskless.mygateway, &nfsv3_diskless.mygateway,
		sizeof(struct sockaddr_in));
	nfs_convert_oargs(&nfsv3_diskless.root_args,&nfs_diskless.root_args);
	if (nfsv3_diskless.root_args.flags & NFSMNT_NFSV3) {
		nfsv3_diskless.root_fhsize = NFSX_V3FH;
		bcopy(nfs_diskless.root_fh, nfsv3_diskless.root_fh, NFSX_V3FH);
	} else {
		nfsv3_diskless.root_fhsize = NFSX_V2FH;
		bcopy(nfs_diskless.root_fh, nfsv3_diskless.root_fh, NFSX_V2FH);
	}
	bcopy(&nfs_diskless.root_saddr,&nfsv3_diskless.root_saddr,
		sizeof(struct sockaddr_in));
	bcopy(nfs_diskless.root_hostnam, nfsv3_diskless.root_hostnam, MNAMELEN);
	nfsv3_diskless.root_time = nfs_diskless.root_time;
	bcopy(nfs_diskless.my_hostnam, nfsv3_diskless.my_hostnam,
		MAXHOSTNAMELEN);
	nfs_diskless_valid = 3;
}

/*
 * nfs statfs call
 */
static int
nfs_statfs(struct mount *mp, struct statfs *sbp)
{
	struct vnode *vp;
	struct thread *td;
	struct nfs_statfs *sfp;
	caddr_t bpos, dpos;
	struct nfsmount *nmp = VFSTONFS(mp);
	int error = 0, v3 = (nmp->nm_flag & NFSMNT_NFSV3), retattr;
	struct mbuf *mreq, *mrep, *md, *mb;
	struct nfsnode *np;
	u_quad_t tquad;

	td = curthread;
#ifndef nolint
	sfp = NULL;
#endif
	error = vfs_busy(mp, MBF_NOWAIT);
	if (error)
		return (error);
	error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np, LK_EXCLUSIVE);
	if (error) {
		vfs_unbusy(mp);
		return (error);
	}
	vp = NFSTOV(np);
	mtx_lock(&nmp->nm_mtx);
	if (v3 && (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) {
		mtx_unlock(&nmp->nm_mtx);		
		(void)nfs_fsinfo(nmp, vp, td->td_ucred, td);
	} else
		mtx_unlock(&nmp->nm_mtx);
	nfsstats.rpccnt[NFSPROC_FSSTAT]++;
	mreq = nfsm_reqhead(vp, NFSPROC_FSSTAT, NFSX_FH(v3));
	mb = mreq;
	bpos = mtod(mb, caddr_t);
	nfsm_fhtom(vp, v3);
	nfsm_request(vp, NFSPROC_FSSTAT, td, td->td_ucred);
	if (v3)
		nfsm_postop_attr(vp, retattr);
	if (error) {
		if (mrep != NULL)
			m_freem(mrep);
		goto nfsmout;
	}
	sfp = nfsm_dissect(struct nfs_statfs *, NFSX_STATFS(v3));
	mtx_lock(&nmp->nm_mtx);
	sbp->f_iosize = nfs_iosize(nmp);
	mtx_unlock(&nmp->nm_mtx);
	if (v3) {
		sbp->f_bsize = NFS_FABLKSIZE;
		tquad = fxdr_hyper(&sfp->sf_tbytes);
		sbp->f_blocks = tquad / NFS_FABLKSIZE;
		tquad = fxdr_hyper(&sfp->sf_fbytes);
		sbp->f_bfree = tquad / NFS_FABLKSIZE;
		tquad = fxdr_hyper(&sfp->sf_abytes);
		sbp->f_bavail = tquad / NFS_FABLKSIZE;
		sbp->f_files = (fxdr_unsigned(int32_t,
		    sfp->sf_tfiles.nfsuquad[1]) & 0x7fffffff);
		sbp->f_ffree = (fxdr_unsigned(int32_t,
		    sfp->sf_ffiles.nfsuquad[1]) & 0x7fffffff);
	} else {
		sbp->f_bsize = fxdr_unsigned(int32_t, sfp->sf_bsize);
		sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks);
		sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree);
		sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail);
		sbp->f_files = 0;
		sbp->f_ffree = 0;
	}
	m_freem(mrep);
nfsmout:
	vput(vp);
	vfs_unbusy(mp);
	return (error);
}

/*
 * nfs version 3 fsinfo rpc call
 */
int
nfs_fsinfo(struct nfsmount *nmp, struct vnode *vp, struct ucred *cred,
    struct thread *td)
{
	struct nfsv3_fsinfo *fsp;
	u_int32_t pref, max;
	caddr_t bpos, dpos;
	int error = 0, retattr;
	struct mbuf *mreq, *mrep, *md, *mb;
	u_int64_t maxfsize;
	
	nfsstats.rpccnt[NFSPROC_FSINFO]++;
	mreq = nfsm_reqhead(vp, NFSPROC_FSINFO, NFSX_FH(1));
	mb = mreq;
	bpos = mtod(mb, caddr_t);
	nfsm_fhtom(vp, 1);
	nfsm_request(vp, NFSPROC_FSINFO, td, cred);
	nfsm_postop_attr(vp, retattr);
	if (!error) {
		fsp = nfsm_dissect(struct nfsv3_fsinfo *, NFSX_V3FSINFO);
		pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref);
		mtx_lock(&nmp->nm_mtx);
		if (pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE)
			nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) &
				~(NFS_FABLKSIZE - 1);
		max = fxdr_unsigned(u_int32_t, fsp->fs_wtmax);
		if (max < nmp->nm_wsize && max > 0) {
			nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1);
			if (nmp->nm_wsize == 0)
				nmp->nm_wsize = max;
		}
		pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref);
		if (pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE)
			nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) &
				~(NFS_FABLKSIZE - 1);
		max = fxdr_unsigned(u_int32_t, fsp->fs_rtmax);
		if (max < nmp->nm_rsize && max > 0) {
			nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1);
			if (nmp->nm_rsize == 0)
				nmp->nm_rsize = max;
		}
		pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref);
		if (pref < nmp->nm_readdirsize && pref >= NFS_DIRBLKSIZ)
			nmp->nm_readdirsize = (pref + NFS_DIRBLKSIZ - 1) &
				~(NFS_DIRBLKSIZ - 1);
		if (max < nmp->nm_readdirsize && max > 0) {
			nmp->nm_readdirsize = max & ~(NFS_DIRBLKSIZ - 1);
			if (nmp->nm_readdirsize == 0)
				nmp->nm_readdirsize = max;
		}
		maxfsize = fxdr_hyper(&fsp->fs_maxfilesize);
		if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize)
			nmp->nm_maxfilesize = maxfsize;
		nmp->nm_mountp->mnt_stat.f_iosize = nfs_iosize(nmp);
		nmp->nm_state |= NFSSTA_GOTFSINFO;
		mtx_unlock(&nmp->nm_mtx);
	}
	m_freem(mrep);
nfsmout:
	return (error);
}

/*
 * Mount a remote root fs via. nfs. This depends on the info in the
 * nfs_diskless structure that has been filled in properly by some primary
 * bootstrap.
 * It goes something like this:
 * - do enough of "ifconfig" by calling ifioctl() so that the system
 *   can talk to the server
 * - If nfs_diskless.mygateway is filled in, use that address as
 *   a default gateway.
 * - build the rootfs mount point and call mountnfs() to do the rest.
 *
 * It is assumed to be safe to read, modify, and write the nfsv3_diskless
 * structure, as well as other global NFS client variables here, as
 * nfs_mountroot() will be called once in the boot before any other NFS
 * client activity occurs.
 */
int
nfs_mountroot(struct mount *mp)
{
	struct thread *td = curthread;
	struct nfsv3_diskless *nd = &nfsv3_diskless;
	struct socket *so;
	struct vnode *vp;
	struct ifreq ir;
	int error;
	u_long l;
	char buf[128];
	char *cp;


#if defined(BOOTP_NFSROOT) && defined(BOOTP)
	bootpc_init();		/* use bootp to get nfs_diskless filled in */
#elif defined(NFS_ROOT)
	nfs_setup_diskless();
#endif

	if (nfs_diskless_valid == 0) {
		return (-1);
	}
	if (nfs_diskless_valid == 1)
		nfs_convert_diskless();

	/*
	 * XXX splnet, so networks will receive...
	 */
	splnet();

	/*
	 * Do enough of ifconfig(8) so that the critical net interface can
	 * talk to the server.
	 */
	error = socreate(nd->myif.ifra_addr.sa_family, &so, nd->root_args.sotype, 0,
	    td->td_ucred, td);
	if (error)
		panic("nfs_mountroot: socreate(%04x): %d",
			nd->myif.ifra_addr.sa_family, error);

#if 0 /* XXX Bad idea */
	/*
	 * We might not have been told the right interface, so we pass
	 * over the first ten interfaces of the same kind, until we get
	 * one of them configured.
	 */

	for (i = strlen(nd->myif.ifra_name) - 1;
		nd->myif.ifra_name[i] >= '0' &&
		nd->myif.ifra_name[i] <= '9';
		nd->myif.ifra_name[i] ++) {
		error = ifioctl(so, SIOCAIFADDR, (caddr_t)&nd->myif, td);
		if(!error)
			break;
	}
#endif

	error = ifioctl(so, SIOCAIFADDR, (caddr_t)&nd->myif, td);
	if (error)
		panic("nfs_mountroot: SIOCAIFADDR: %d", error);

	if ((cp = getenv("boot.netif.mtu")) != NULL) {
		ir.ifr_mtu = strtol(cp, NULL, 10);
		bcopy(nd->myif.ifra_name, ir.ifr_name, IFNAMSIZ);
		freeenv(cp);
		error = ifioctl(so, SIOCSIFMTU, (caddr_t)&ir, td);
		if (error)
			printf("nfs_mountroot: SIOCSIFMTU: %d", error);
	}
	soclose(so);

	/*
	 * If the gateway field is filled in, set it as the default route.
	 * Note that pxeboot will set a default route of 0 if the route
	 * is not set by the DHCP server.  Check also for a value of 0
	 * to avoid panicking inappropriately in that situation.
	 */
	if (nd->mygateway.sin_len != 0 &&
	    nd->mygateway.sin_addr.s_addr != 0) {
		struct sockaddr_in mask, sin;

		bzero((caddr_t)&mask, sizeof(mask));
		sin = mask;
		sin.sin_family = AF_INET;
		sin.sin_len = sizeof(sin);
                /* XXX MRT use table 0 for this sort of thing */
		CURVNET_SET(TD_TO_VNET(td));
		error = rtrequest_fib(RTM_ADD, (struct sockaddr *)&sin,
		    (struct sockaddr *)&nd->mygateway,
		    (struct sockaddr *)&mask,
		    RTF_UP | RTF_GATEWAY, NULL, RT_DEFAULT_FIB);
		CURVNET_RESTORE();
		if (error)
			panic("nfs_mountroot: RTM_ADD: %d", error);
	}

	/*
	 * Create the rootfs mount point.
	 */
	nd->root_args.fh = nd->root_fh;
	nd->root_args.fhsize = nd->root_fhsize;
	l = ntohl(nd->root_saddr.sin_addr.s_addr);
	snprintf(buf, sizeof(buf), "%ld.%ld.%ld.%ld:%s",
		(l >> 24) & 0xff, (l >> 16) & 0xff,
		(l >>  8) & 0xff, (l >>  0) & 0xff, nd->root_hostnam);
	printf("NFS ROOT: %s\n", buf);
	nd->root_args.hostname = buf;
	if ((error = nfs_mountdiskless(buf,
	    &nd->root_saddr, &nd->root_args, td, &vp, mp)) != 0) {
		return (error);
	}

	/*
	 * This is not really an nfs issue, but it is much easier to
	 * set hostname here and then let the "/etc/rc.xxx" files
	 * mount the right /var based upon its preset value.
	 */
	mtx_lock(&prison0.pr_mtx);
	strlcpy(prison0.pr_hostname, nd->my_hostnam,
	    sizeof (prison0.pr_hostname));
	mtx_unlock(&prison0.pr_mtx);
	inittodr(ntohl(nd->root_time));
	return (0);
}

/*
 * Internal version of mount system call for diskless setup.
 */
static int
nfs_mountdiskless(char *path,
    struct sockaddr_in *sin, struct nfs_args *args, struct thread *td,
    struct vnode **vpp, struct mount *mp)
{
	struct sockaddr *nam;
	int error;

	nam = sodupsockaddr((struct sockaddr *)sin, M_WAITOK);
	if ((error = mountnfs(args, mp, nam, path, vpp, td->td_ucred,
	    NFS_DEFAULT_NAMETIMEO, NFS_DEFAULT_NEGNAMETIMEO)) != 0) {
		printf("nfs_mountroot: mount %s on /: %d\n", path, error);
		return (error);
	}
	return (0);
}

static int
nfs_sec_name_to_num(char *sec)
{
	if (!strcmp(sec, "krb5"))
		return (RPCSEC_GSS_KRB5);
	if (!strcmp(sec, "krb5i"))
		return (RPCSEC_GSS_KRB5I);
	if (!strcmp(sec, "krb5p"))
		return (RPCSEC_GSS_KRB5P);
	if (!strcmp(sec, "sys"))
		return (AUTH_SYS);
	/*
	 * Userland should validate the string but we will try and
	 * cope with unexpected values.
	 */
	return (AUTH_SYS);
}

static void
nfs_decode_args(struct mount *mp, struct nfsmount *nmp, struct nfs_args *argp,
	const char *hostname)
{
	int s;
	int adjsock;
	int maxio;
	char *p;
	char *secname;
	char *principal;

	s = splnet();

	/*
	 * Set read-only flag if requested; otherwise, clear it if this is
	 * an update.  If this is not an update, then either the read-only
	 * flag is already clear, or this is a root mount and it was set
	 * intentionally at some previous point.
	 */
	if (vfs_getopt(mp->mnt_optnew, "ro", NULL, NULL) == 0) {
		MNT_ILOCK(mp);
		mp->mnt_flag |= MNT_RDONLY;
		MNT_IUNLOCK(mp);
	} else if (mp->mnt_flag & MNT_UPDATE) {
		MNT_ILOCK(mp);
		mp->mnt_flag &= ~MNT_RDONLY;
		MNT_IUNLOCK(mp);
	}

	/*
	 * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes
	 * no sense in that context.  Also, set up appropriate retransmit
	 * and soft timeout behavior.
	 */
	if (argp->sotype == SOCK_STREAM) {
		nmp->nm_flag &= ~NFSMNT_NOCONN;
		nmp->nm_flag |= NFSMNT_DUMBTIMR;
		nmp->nm_timeo = NFS_MAXTIMEO;
		nmp->nm_retry = NFS_RETRANS_TCP;
	}

	/* Also clear RDIRPLUS if not NFSv3, it crashes some servers */
	if ((argp->flags & NFSMNT_NFSV3) == 0)
		nmp->nm_flag &= ~NFSMNT_RDIRPLUS;

	/* Re-bind if rsrvd port requested and wasn't on one */
	adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT)
		  && (argp->flags & NFSMNT_RESVPORT);
	/* Also re-bind if we're switching to/from a connected UDP socket */
	adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) !=
		    (argp->flags & NFSMNT_NOCONN));

	/* Update flags atomically.  Don't change the lock bits. */
	nmp->nm_flag = argp->flags | nmp->nm_flag;
	splx(s);

	if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) {
		nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10;
		if (nmp->nm_timeo < NFS_MINTIMEO)
			nmp->nm_timeo = NFS_MINTIMEO;
		else if (nmp->nm_timeo > NFS_MAXTIMEO)
			nmp->nm_timeo = NFS_MAXTIMEO;
	}

	if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) {
		nmp->nm_retry = argp->retrans;
		if (nmp->nm_retry > NFS_MAXREXMIT)
			nmp->nm_retry = NFS_MAXREXMIT;
	}

	if (argp->flags & NFSMNT_NFSV3) {
		if (argp->sotype == SOCK_DGRAM)
			maxio = NFS_MAXDGRAMDATA;
		else
			maxio = NFS_MAXDATA;
	} else
		maxio = NFS_V2MAXDATA;

	if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) {
		nmp->nm_wsize = argp->wsize;
		/* Round down to multiple of blocksize */
		nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1);
		if (nmp->nm_wsize <= 0)
			nmp->nm_wsize = NFS_FABLKSIZE;
	}
	if (nmp->nm_wsize > maxio)
		nmp->nm_wsize = maxio;
	if (nmp->nm_wsize > MAXBSIZE)
		nmp->nm_wsize = MAXBSIZE;

	if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) {
		nmp->nm_rsize = argp->rsize;
		/* Round down to multiple of blocksize */
		nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1);
		if (nmp->nm_rsize <= 0)
			nmp->nm_rsize = NFS_FABLKSIZE;
	}
	if (nmp->nm_rsize > maxio)
		nmp->nm_rsize = maxio;
	if (nmp->nm_rsize > MAXBSIZE)
		nmp->nm_rsize = MAXBSIZE;

	if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) {
		nmp->nm_readdirsize = argp->readdirsize;
	}
	if (nmp->nm_readdirsize > maxio)
		nmp->nm_readdirsize = maxio;
	if (nmp->nm_readdirsize > nmp->nm_rsize)
		nmp->nm_readdirsize = nmp->nm_rsize;

	if ((argp->flags & NFSMNT_ACREGMIN) && argp->acregmin >= 0)
		nmp->nm_acregmin = argp->acregmin;
	else
		nmp->nm_acregmin = NFS_MINATTRTIMO;
	if ((argp->flags & NFSMNT_ACREGMAX) && argp->acregmax >= 0)
		nmp->nm_acregmax = argp->acregmax;
	else
		nmp->nm_acregmax = NFS_MAXATTRTIMO;
	if ((argp->flags & NFSMNT_ACDIRMIN) && argp->acdirmin >= 0)
		nmp->nm_acdirmin = argp->acdirmin;
	else
		nmp->nm_acdirmin = NFS_MINDIRATTRTIMO;
	if ((argp->flags & NFSMNT_ACDIRMAX) && argp->acdirmax >= 0)
		nmp->nm_acdirmax = argp->acdirmax;
	else
		nmp->nm_acdirmax = NFS_MAXDIRATTRTIMO;
	if (nmp->nm_acdirmin > nmp->nm_acdirmax)
		nmp->nm_acdirmin = nmp->nm_acdirmax;
	if (nmp->nm_acregmin > nmp->nm_acregmax)
		nmp->nm_acregmin = nmp->nm_acregmax;

	if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0) {
		if (argp->maxgrouplist <= NFS_MAXGRPS)
			nmp->nm_numgrps = argp->maxgrouplist;
		else
			nmp->nm_numgrps = NFS_MAXGRPS;
	}
	if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0) {
		if (argp->readahead <= NFS_MAXRAHEAD)
			nmp->nm_readahead = argp->readahead;
		else
			nmp->nm_readahead = NFS_MAXRAHEAD;
	}
	if ((argp->flags & NFSMNT_WCOMMITSIZE) && argp->wcommitsize >= 0) {
		if (argp->wcommitsize < nmp->nm_wsize)
			nmp->nm_wcommitsize = nmp->nm_wsize;
		else
			nmp->nm_wcommitsize = argp->wcommitsize;
	}
	if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 0) {
		if (argp->deadthresh <= NFS_MAXDEADTHRESH)
			nmp->nm_deadthresh = argp->deadthresh;
		else
			nmp->nm_deadthresh = NFS_MAXDEADTHRESH;
	}

	adjsock |= ((nmp->nm_sotype != argp->sotype) ||
		    (nmp->nm_soproto != argp->proto));
	nmp->nm_sotype = argp->sotype;
	nmp->nm_soproto = argp->proto;

	if (nmp->nm_client && adjsock) {
		nfs_safedisconnect(nmp);
		if (nmp->nm_sotype == SOCK_DGRAM)
			while (nfs_connect(nmp)) {
				printf("nfs_args: retrying connect\n");
				(void) tsleep(&fake_wchan, PSOCK, "nfscon", hz);
			}
	}

	if (hostname) {
		strlcpy(nmp->nm_hostname, hostname,
		    sizeof(nmp->nm_hostname));
		p = strchr(nmp->nm_hostname, ':');
		if (p)
			*p = '\0';
	}

	if (vfs_getopt(mp->mnt_optnew, "sec",
		(void **) &secname, NULL) == 0) {
		nmp->nm_secflavor = nfs_sec_name_to_num(secname);
	} else {
		nmp->nm_secflavor = AUTH_SYS;
	}

	if (vfs_getopt(mp->mnt_optnew, "principal",
		(void **) &principal, NULL) == 0) {
		strlcpy(nmp->nm_principal, principal,
		    sizeof(nmp->nm_principal));
	} else {
		snprintf(nmp->nm_principal, sizeof(nmp->nm_principal),
		    "nfs@%s", nmp->nm_hostname);
	}
}

static const char *nfs_opts[] = { "from", "nfs_args",
    "noatime", "noexec", "suiddir", "nosuid", "nosymfollow", "union",
    "noclusterr", "noclusterw", "multilabel", "acls", "force", "update",
    "async", "dumbtimer", "noconn", "nolockd", "intr", "rdirplus", "resvport",
    "readahead", "readdirsize", "soft", "hard", "mntudp", "tcp", "udp",
    "wsize", "rsize", "retrans", "acregmin", "acregmax", "acdirmin",
    "acdirmax", "deadthresh", "hostname", "timeout", "addr", "fh", "nfsv3",
    "sec", "maxgroups", "principal", "negnametimeo", "nocto", "wcommitsize",
    "nametimeo",
    NULL };

/*
 * VFS Operations.
 *
 * mount system call
 * It seems a bit dumb to copyinstr() the host and path here and then
 * bcopy() them in mountnfs(), but I wanted to detect errors before
 * doing the sockargs() call because sockargs() allocates an mbuf and
 * an error after that means that I have to release the mbuf.
 */
/* ARGSUSED */
static int
nfs_mount(struct mount *mp)
{
	struct nfs_args args = {
	    .version = NFS_ARGSVERSION,
	    .addr = NULL,
	    .addrlen = sizeof (struct sockaddr_in),
	    .sotype = SOCK_STREAM,
	    .proto = 0,
	    .fh = NULL,
	    .fhsize = 0,
	    .flags = NFSMNT_RESVPORT,
	    .wsize = NFS_WSIZE,
	    .rsize = NFS_RSIZE,
	    .readdirsize = NFS_READDIRSIZE,
	    .timeo = 10,
	    .retrans = NFS_RETRANS,
	    .maxgrouplist = NFS_MAXGRPS,
	    .readahead = NFS_DEFRAHEAD,
	    .wcommitsize = 0,			/* was: NQ_DEFLEASE */
	    .deadthresh = NFS_MAXDEADTHRESH,	/* was: NQ_DEADTHRESH */
	    .hostname = NULL,
	    /* args version 4 */
	    .acregmin = NFS_MINATTRTIMO,
	    .acregmax = NFS_MAXATTRTIMO,
	    .acdirmin = NFS_MINDIRATTRTIMO,
	    .acdirmax = NFS_MAXDIRATTRTIMO,
	};
	int error, ret, has_nfs_args_opt;
	int has_addr_opt, has_fh_opt, has_hostname_opt;
	struct sockaddr *nam;
	struct vnode *vp;
	char hst[MNAMELEN];
	size_t len;
	u_char nfh[NFSX_V3FHMAX];
	char *opt;
	int nametimeo = NFS_DEFAULT_NAMETIMEO;
	int negnametimeo = NFS_DEFAULT_NEGNAMETIMEO;

	has_nfs_args_opt = 0;
	has_addr_opt = 0;
	has_fh_opt = 0;
	has_hostname_opt = 0;

	if (vfs_filteropt(mp->mnt_optnew, nfs_opts)) {
		error = EINVAL;
		goto out;
	}

	if ((mp->mnt_flag & (MNT_ROOTFS | MNT_UPDATE)) == MNT_ROOTFS) {
		error = nfs_mountroot(mp);
		goto out;
	}

	/*
	 * The old mount_nfs program passed the struct nfs_args
	 * from userspace to kernel.  The new mount_nfs program
	 * passes string options via nmount() from userspace to kernel
	 * and we populate the struct nfs_args in the kernel.
	 */
	if (vfs_getopt(mp->mnt_optnew, "nfs_args", NULL, NULL) == 0) {
		error = vfs_copyopt(mp->mnt_optnew, "nfs_args", &args,
		    sizeof args);
		if (error)
			goto out;

		if (args.version != NFS_ARGSVERSION) {
			error = EPROGMISMATCH;
			goto out;
		}
		has_nfs_args_opt = 1;
	}

	if (vfs_getopt(mp->mnt_optnew, "dumbtimer", NULL, NULL) == 0)
		args.flags |= NFSMNT_DUMBTIMR;
	if (vfs_getopt(mp->mnt_optnew, "noconn", NULL, NULL) == 0)
		args.flags |= NFSMNT_NOCONN;
	if (vfs_getopt(mp->mnt_optnew, "conn", NULL, NULL) == 0)
		args.flags |= NFSMNT_NOCONN;
	if (vfs_getopt(mp->mnt_optnew, "nolockd", NULL, NULL) == 0)
		args.flags |= NFSMNT_NOLOCKD;
	if (vfs_getopt(mp->mnt_optnew, "lockd", NULL, NULL) == 0)
		args.flags &= ~NFSMNT_NOLOCKD;
	if (vfs_getopt(mp->mnt_optnew, "intr", NULL, NULL) == 0)
		args.flags |= NFSMNT_INT;
	if (vfs_getopt(mp->mnt_optnew, "rdirplus", NULL, NULL) == 0)
		args.flags |= NFSMNT_RDIRPLUS;
	if (vfs_getopt(mp->mnt_optnew, "resvport", NULL, NULL) == 0)
		args.flags |= NFSMNT_RESVPORT;
	if (vfs_getopt(mp->mnt_optnew, "noresvport", NULL, NULL) == 0)
		args.flags &= ~NFSMNT_RESVPORT;
	if (vfs_getopt(mp->mnt_optnew, "soft", NULL, NULL) == 0)
		args.flags |= NFSMNT_SOFT;
	if (vfs_getopt(mp->mnt_optnew, "hard", NULL, NULL) == 0)
		args.flags &= ~NFSMNT_SOFT;
	if (vfs_getopt(mp->mnt_optnew, "mntudp", NULL, NULL) == 0)
		args.sotype = SOCK_DGRAM;
	if (vfs_getopt(mp->mnt_optnew, "udp", NULL, NULL) == 0)
		args.sotype = SOCK_DGRAM;
	if (vfs_getopt(mp->mnt_optnew, "tcp", NULL, NULL) == 0)
		args.sotype = SOCK_STREAM;
	if (vfs_getopt(mp->mnt_optnew, "nfsv3", NULL, NULL) == 0)
		args.flags |= NFSMNT_NFSV3;
	if (vfs_getopt(mp->mnt_optnew, "nocto", NULL, NULL) == 0)
		args.flags |= NFSMNT_NOCTO;
	if (vfs_getopt(mp->mnt_optnew, "readdirsize", (void **)&opt, NULL) == 0) {
		if (opt == NULL) { 
			vfs_mount_error(mp, "illegal readdirsize");
			error = EINVAL;
			goto out;
		}
		ret = sscanf(opt, "%d", &args.readdirsize);
		if (ret != 1 || args.readdirsize <= 0) {
			vfs_mount_error(mp, "illegal readdirsize: %s",
			    opt);
			error = EINVAL;
			goto out;
		}
		args.flags |= NFSMNT_READDIRSIZE;
	}
	if (vfs_getopt(mp->mnt_optnew, "readahead", (void **)&opt, NULL) == 0) {
		if (opt == NULL) { 
			vfs_mount_error(mp, "illegal readahead");
			error = EINVAL;
			goto out;
		}
		ret = sscanf(opt, "%d", &args.readahead);
		if (ret != 1 || args.readahead <= 0) {
			vfs_mount_error(mp, "illegal readahead: %s",
			    opt);
			error = EINVAL;
			goto out;
		}
		args.flags |= NFSMNT_READAHEAD;
	}
	if (vfs_getopt(mp->mnt_optnew, "wsize", (void **)&opt, NULL) == 0) {
		if (opt == NULL) { 
			vfs_mount_error(mp, "illegal wsize");
			error = EINVAL;
			goto out;
		}
		ret = sscanf(opt, "%d", &args.wsize);
		if (ret != 1 || args.wsize <= 0) {
			vfs_mount_error(mp, "illegal wsize: %s",
			    opt);
			error = EINVAL;
			goto out;
		}
		args.flags |= NFSMNT_WSIZE;
	}
	if (vfs_getopt(mp->mnt_optnew, "rsize", (void **)&opt, NULL) == 0) {
		if (opt == NULL) { 
			vfs_mount_error(mp, "illegal rsize");
			error = EINVAL;
			goto out;
		}
		ret = sscanf(opt, "%d", &args.rsize);
		if (ret != 1 || args.rsize <= 0) {
			vfs_mount_error(mp, "illegal wsize: %s",
			    opt);
			error = EINVAL;
			goto out;
		}
		args.flags |= NFSMNT_RSIZE;
	}
	if (vfs_getopt(mp->mnt_optnew, "retrans", (void **)&opt, NULL) == 0) {
		if (opt == NULL) { 
			vfs_mount_error(mp, "illegal retrans");
			error = EINVAL;
			goto out;
		}
		ret = sscanf(opt, "%d", &args.retrans);
		if (ret != 1 || args.retrans <= 0) {
			vfs_mount_error(mp, "illegal retrans: %s",
			    opt);
			error = EINVAL;
			goto out;
		}
		args.flags |= NFSMNT_RETRANS;
	}
	if (vfs_getopt(mp->mnt_optnew, "acregmin", (void **)&opt, NULL) == 0) {
		ret = sscanf(opt, "%d", &args.acregmin);
		if (ret != 1 || args.acregmin < 0) {
			vfs_mount_error(mp, "illegal acregmin: %s",
			    opt);
			error = EINVAL;
			goto out;
		}
		args.flags |= NFSMNT_ACREGMIN;
	}
	if (vfs_getopt(mp->mnt_optnew, "acregmax", (void **)&opt, NULL) == 0) {
		ret = sscanf(opt, "%d", &args.acregmax);
		if (ret != 1 || args.acregmax < 0) {
			vfs_mount_error(mp, "illegal acregmax: %s",
			    opt);
			error = EINVAL;
			goto out;
		}
		args.flags |= NFSMNT_ACREGMAX;
	}
	if (vfs_getopt(mp->mnt_optnew, "acdirmin", (void **)&opt, NULL) == 0) {
		ret = sscanf(opt, "%d", &args.acdirmin);
		if (ret != 1 || args.acdirmin < 0) {
			vfs_mount_error(mp, "illegal acdirmin: %s",
			    opt);
			error = EINVAL;
			goto out;
		}
		args.flags |= NFSMNT_ACDIRMIN;
	}
	if (vfs_getopt(mp->mnt_optnew, "acdirmax", (void **)&opt, NULL) == 0) {
		ret = sscanf(opt, "%d", &args.acdirmax);
		if (ret != 1 || args.acdirmax < 0) {
			vfs_mount_error(mp, "illegal acdirmax: %s",
			    opt);
			error = EINVAL;
			goto out;
		}
		args.flags |= NFSMNT_ACDIRMAX;
	}
	if (vfs_getopt(mp->mnt_optnew, "wcommitsize", (void **)&opt, NULL) == 0) {
		ret = sscanf(opt, "%d", &args.wcommitsize);
		if (ret != 1 || args.wcommitsize < 0) {
			vfs_mount_error(mp, "illegal wcommitsize: %s", opt);
			error = EINVAL;
			goto out;
		}
		args.flags |= NFSMNT_WCOMMITSIZE;
	}
	if (vfs_getopt(mp->mnt_optnew, "deadthresh", (void **)&opt, NULL) == 0) {
		ret = sscanf(opt, "%d", &args.deadthresh);
		if (ret != 1 || args.deadthresh <= 0) {
			vfs_mount_error(mp, "illegal deadthresh: %s",
			    opt);
			error = EINVAL;
			goto out;
		}
		args.flags |= NFSMNT_DEADTHRESH;
	}
	if (vfs_getopt(mp->mnt_optnew, "timeout", (void **)&opt, NULL) == 0) {
		ret = sscanf(opt, "%d", &args.timeo);
		if (ret != 1 || args.timeo <= 0) {
			vfs_mount_error(mp, "illegal timeout: %s",
			    opt);
			error = EINVAL;
			goto out;
		}
		args.flags |= NFSMNT_TIMEO;
	}
	if (vfs_getopt(mp->mnt_optnew, "maxgroups", (void **)&opt, NULL) == 0) {
		ret = sscanf(opt, "%d", &args.maxgrouplist);
		if (ret != 1 || args.maxgrouplist <= 0) {
			vfs_mount_error(mp, "illegal maxgroups: %s",
			    opt);
			error = EINVAL;
			goto out;
		}
		args.flags |= NFSMNT_MAXGRPS;
	}
	if (vfs_getopt(mp->mnt_optnew, "nametimeo", (void **)&opt, NULL) == 0) {
		ret = sscanf(opt, "%d", &nametimeo);
		if (ret != 1 || nametimeo < 0) {
			vfs_mount_error(mp, "illegal nametimeo: %s", opt);
			error = EINVAL;
			goto out;
		}
	}
	if (vfs_getopt(mp->mnt_optnew, "negnametimeo", (void **)&opt, NULL)
	    == 0) {
		ret = sscanf(opt, "%d", &negnametimeo);
		if (ret != 1 || negnametimeo < 0) {
			vfs_mount_error(mp, "illegal negnametimeo: %s",
			    opt);
			error = EINVAL;
			goto out;
		}
	}
	if (vfs_getopt(mp->mnt_optnew, "addr", (void **)&args.addr,
		&args.addrlen) == 0) {
		has_addr_opt = 1;
		if (args.addrlen > SOCK_MAXADDRLEN) {
			error = ENAMETOOLONG;
			goto out;
		}
		nam = malloc(args.addrlen, M_SONAME,
		    M_WAITOK);
		bcopy(args.addr, nam, args.addrlen);
		nam->sa_len = args.addrlen;
	}
	if (vfs_getopt(mp->mnt_optnew, "fh", (void **)&args.fh,
		&args.fhsize) == 0) {
		has_fh_opt = 1;
	}
	if (vfs_getopt(mp->mnt_optnew, "hostname", (void **)&args.hostname,
		NULL) == 0) {
		has_hostname_opt = 1;
	}
	if (args.hostname == NULL) {
		vfs_mount_error(mp, "Invalid hostname");
		error = EINVAL;
		goto out;
	}
	if (args.fhsize < 0 || args.fhsize > NFSX_V3FHMAX) {
		vfs_mount_error(mp, "Bad file handle");
		error = EINVAL;
		goto out;
	}

	if (mp->mnt_flag & MNT_UPDATE) {
		struct nfsmount *nmp = VFSTONFS(mp);

		if (nmp == NULL) {
			error = EIO;
			goto out;
		}

		/*
		 * If a change from TCP->UDP is done and there are thread(s)
		 * that have I/O RPC(s) in progress with a tranfer size
		 * greater than NFS_MAXDGRAMDATA, those thread(s) will be
		 * hung, retrying the RPC(s) forever. Usually these threads
		 * will be seen doing an uninterruptible sleep on wait channel
		 * "newnfsreq" (truncated to "newnfsre" by procstat).
		 */
		if (args.sotype == SOCK_DGRAM && nmp->nm_sotype == SOCK_STREAM)
			tprintf(curthread->td_proc, LOG_WARNING,
	"Warning: mount -u that changes TCP->UDP can result in hung threads\n");

		/*
		 * When doing an update, we can't change from or to
		 * v3, switch lockd strategies or change cookie translation
		 */
		args.flags = (args.flags &
		    ~(NFSMNT_NFSV3 | NFSMNT_NOLOCKD /*|NFSMNT_XLATECOOKIE*/)) |
		    (nmp->nm_flag &
			(NFSMNT_NFSV3 | NFSMNT_NOLOCKD /*|NFSMNT_XLATECOOKIE*/));
		nfs_decode_args(mp, nmp, &args, NULL);
		goto out;
	}

	/*
	 * Make the nfs_ip_paranoia sysctl serve as the default connection
	 * or no-connection mode for those protocols that support 
	 * no-connection mode (the flag will be cleared later for protocols
	 * that do not support no-connection mode).  This will allow a client
	 * to receive replies from a different IP then the request was
	 * sent to.  Note: default value for nfs_ip_paranoia is 1 (paranoid),
	 * not 0.
	 */
	if (nfs_ip_paranoia == 0)
		args.flags |= NFSMNT_NOCONN;

	if (has_nfs_args_opt) {
		/*
		 * In the 'nfs_args' case, the pointers in the args
		 * structure are in userland - we copy them in here.
		 */
		if (!has_fh_opt) {
			error = copyin((caddr_t)args.fh, (caddr_t)nfh,
			    args.fhsize);
			if (error) {
				goto out;
			}
			args.fh = nfh;
		}
		if (!has_hostname_opt) {
			error = copyinstr(args.hostname, hst, MNAMELEN-1, &len);
			if (error) {
				goto out;
			}
			bzero(&hst[len], MNAMELEN - len);
			args.hostname = hst;
		}
		if (!has_addr_opt) {
			/* sockargs() call must be after above copyin() calls */
			error = getsockaddr(&nam, (caddr_t)args.addr,
			    args.addrlen);
			if (error) {
				goto out;
			}
		}
	} else if (has_addr_opt == 0) {
		vfs_mount_error(mp, "No server address");
		error = EINVAL;
		goto out;
	}
	error = mountnfs(&args, mp, nam, args.hostname, &vp,
	    curthread->td_ucred, nametimeo, negnametimeo);
out:
	if (!error) {
		MNT_ILOCK(mp);
		mp->mnt_kern_flag |= MNTK_LOOKUP_SHARED;
		MNT_IUNLOCK(mp);
	}
	return (error);
}


/*
 * VFS Operations.
 *
 * mount system call
 * It seems a bit dumb to copyinstr() the host and path here and then
 * bcopy() them in mountnfs(), but I wanted to detect errors before
 * doing the sockargs() call because sockargs() allocates an mbuf and
 * an error after that means that I have to release the mbuf.
 */
/* ARGSUSED */
static int
nfs_cmount(struct mntarg *ma, void *data, uint64_t flags)
{
	int error;
	struct nfs_args args;

	error = copyin(data, &args, sizeof (struct nfs_args));
	if (error)
		return error;

	ma = mount_arg(ma, "nfs_args", &args, sizeof args);

	error = kernel_mount(ma, flags);
	return (error);
}

/*
 * Common code for mount and mountroot
 */
static int
mountnfs(struct nfs_args *argp, struct mount *mp, struct sockaddr *nam,
    char *hst, struct vnode **vpp, struct ucred *cred, int nametimeo,
    int negnametimeo)
{
	struct nfsmount *nmp;
	struct nfsnode *np;
	int error;
	struct vattr attrs;

	if (mp->mnt_flag & MNT_UPDATE) {
		nmp = VFSTONFS(mp);
		printf("%s: MNT_UPDATE is no longer handled here\n", __func__);
		free(nam, M_SONAME);
		return (0);
	} else {
		nmp = uma_zalloc(nfsmount_zone, M_WAITOK);
		bzero((caddr_t)nmp, sizeof (struct nfsmount));
		TAILQ_INIT(&nmp->nm_bufq);
		mp->mnt_data = nmp;
		nmp->nm_getinfo = nfs_getnlminfo;
		nmp->nm_vinvalbuf = nfs_vinvalbuf;
	}
	vfs_getnewfsid(mp);
	nmp->nm_mountp = mp;
	mtx_init(&nmp->nm_mtx, "NFSmount lock", NULL, MTX_DEF);			

	/*
	 * V2 can only handle 32 bit filesizes.  A 4GB-1 limit may be too
	 * high, depending on whether we end up with negative offsets in
	 * the client or server somewhere.  2GB-1 may be safer.
	 *
	 * For V3, nfs_fsinfo will adjust this as necessary.  Assume maximum
	 * that we can handle until we find out otherwise.
	 */
	if ((argp->flags & NFSMNT_NFSV3) == 0)
		nmp->nm_maxfilesize = 0xffffffffLL;
	else
		nmp->nm_maxfilesize = OFF_MAX;

	nmp->nm_timeo = NFS_TIMEO;
	nmp->nm_retry = NFS_RETRANS;
	if ((argp->flags & NFSMNT_NFSV3) && argp->sotype == SOCK_STREAM) {
		nmp->nm_wsize = nmp->nm_rsize = NFS_MAXDATA;
	} else {
		nmp->nm_wsize = NFS_WSIZE;
		nmp->nm_rsize = NFS_RSIZE;
	}
	nmp->nm_wcommitsize = hibufspace / (desiredvnodes / 1000);
	nmp->nm_readdirsize = NFS_READDIRSIZE;
	nmp->nm_numgrps = NFS_MAXGRPS;
	nmp->nm_readahead = NFS_DEFRAHEAD;
	nmp->nm_deadthresh = NFS_MAXDEADTHRESH;
	nmp->nm_nametimeo = nametimeo;
	nmp->nm_negnametimeo = negnametimeo;
	nmp->nm_tprintf_delay = nfs_tprintf_delay;
	if (nmp->nm_tprintf_delay < 0)
		nmp->nm_tprintf_delay = 0;
	nmp->nm_tprintf_initial_delay = nfs_tprintf_initial_delay;
	if (nmp->nm_tprintf_initial_delay < 0)
		nmp->nm_tprintf_initial_delay = 0;
	nmp->nm_fhsize = argp->fhsize;
	bcopy((caddr_t)argp->fh, (caddr_t)nmp->nm_fh, argp->fhsize);
	bcopy(hst, mp->mnt_stat.f_mntfromname, MNAMELEN);
	nmp->nm_nam = nam;
	/* Set up the sockets and per-host congestion */
	nmp->nm_sotype = argp->sotype;
	nmp->nm_soproto = argp->proto;
	nmp->nm_rpcops = &nfs_rpcops;

	nfs_decode_args(mp, nmp, argp, hst);

	/*
	 * For Connection based sockets (TCP,...) defer the connect until
	 * the first request, in case the server is not responding.
	 */
	if (nmp->nm_sotype == SOCK_DGRAM &&
		(error = nfs_connect(nmp)))
		goto bad;

	/*
	 * This is silly, but it has to be set so that vinifod() works.
	 * We do not want to do an nfs_statfs() here since we can get
	 * stuck on a dead server and we are holding a lock on the mount
	 * point.
	 */
	mtx_lock(&nmp->nm_mtx);
	mp->mnt_stat.f_iosize = nfs_iosize(nmp);
	mtx_unlock(&nmp->nm_mtx);
	/*
	 * A reference count is needed on the nfsnode representing the
	 * remote root.  If this object is not persistent, then backward
	 * traversals of the mount point (i.e. "..") will not work if
	 * the nfsnode gets flushed out of the cache. Ufs does not have
	 * this problem, because one can identify root inodes by their
	 * number == ROOTINO (2).
	 */
	error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np, LK_EXCLUSIVE);
	if (error)
		goto bad;
	*vpp = NFSTOV(np);

	/*
	 * Get file attributes and transfer parameters for the
	 * mountpoint.  This has the side effect of filling in
	 * (*vpp)->v_type with the correct value.
	 */
	if (argp->flags & NFSMNT_NFSV3)
		nfs_fsinfo(nmp, *vpp, curthread->td_ucred, curthread);
	else
		VOP_GETATTR(*vpp, &attrs, curthread->td_ucred);

	/*
	 * Lose the lock but keep the ref.
	 */
	VOP_UNLOCK(*vpp, 0);

	return (0);
bad:
	nfs_disconnect(nmp);
	mtx_destroy(&nmp->nm_mtx);
	uma_zfree(nfsmount_zone, nmp);
	free(nam, M_SONAME);
	return (error);
}

/*
 * unmount system call
 */
static int
nfs_unmount(struct mount *mp, int mntflags)
{
	struct nfsmount *nmp;
	int error, flags = 0;

	if (mntflags & MNT_FORCE)
		flags |= FORCECLOSE;
	nmp = VFSTONFS(mp);
	/*
	 * Goes something like this..
	 * - Call vflush() to clear out vnodes for this filesystem
	 * - Close the socket
	 * - Free up the data structures
	 */
	/* In the forced case, cancel any outstanding requests. */
	if (flags & FORCECLOSE) {
		error = nfs_nmcancelreqs(nmp);
		if (error)
			goto out;
	}
	/* We hold 1 extra ref on the root vnode; see comment in mountnfs(). */
	error = vflush(mp, 1, flags, curthread);
	if (error)
		goto out;

	/*
	 * We are now committed to the unmount.
	 */
	nfs_disconnect(nmp);
	free(nmp->nm_nam, M_SONAME);

	mtx_destroy(&nmp->nm_mtx);
	uma_zfree(nfsmount_zone, nmp);
out:
	return (error);
}

/*
 * Return root of a filesystem
 */
static int
nfs_root(struct mount *mp, int flags, struct vnode **vpp)
{
	struct vnode *vp;
	struct nfsmount *nmp;
	struct nfsnode *np;
	int error;

	nmp = VFSTONFS(mp);
	error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np, flags);
	if (error)
		return error;
	vp = NFSTOV(np);
	/*
	 * Get transfer parameters and attributes for root vnode once.
	 */
	mtx_lock(&nmp->nm_mtx);
	if ((nmp->nm_state & NFSSTA_GOTFSINFO) == 0 &&
	    (nmp->nm_flag & NFSMNT_NFSV3)) {
		mtx_unlock(&nmp->nm_mtx);
		nfs_fsinfo(nmp, vp, curthread->td_ucred, curthread);
	} else 
		mtx_unlock(&nmp->nm_mtx);
	if (vp->v_type == VNON)
	    vp->v_type = VDIR;
	vp->v_vflag |= VV_ROOT;
	*vpp = vp;
	return (0);
}

/*
 * Flush out the buffer cache
 */
/* ARGSUSED */
static int
nfs_sync(struct mount *mp, int waitfor)
{
	struct vnode *vp, *mvp;
	struct thread *td;
	int error, allerror = 0;

	td = curthread;

	MNT_ILOCK(mp);
	/*
	 * If a forced dismount is in progress, return from here so that
	 * the umount(2) syscall doesn't get stuck in VFS_SYNC() before
	 * calling VFS_UNMOUNT().
	 */
	if ((mp->mnt_kern_flag & MNTK_UNMOUNTF) != 0) {
		MNT_IUNLOCK(mp);
		return (EBADF);
	}
	MNT_IUNLOCK(mp);

	/*
	 * Force stale buffer cache information to be flushed.
	 */
loop:
	MNT_VNODE_FOREACH_ALL(vp, mp, mvp) {
		/* XXX Racy bv_cnt check. */
		if (VOP_ISLOCKED(vp) || vp->v_bufobj.bo_dirty.bv_cnt == 0 ||
		    waitfor == MNT_LAZY) {
			VI_UNLOCK(vp);
			continue;
		}
		if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) {
			MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
			goto loop;
		}
		error = VOP_FSYNC(vp, waitfor, td);
		if (error)
			allerror = error;
		VOP_UNLOCK(vp, 0);
		vrele(vp);
	}
	return (allerror);
}

static int
nfs_sysctl(struct mount *mp, fsctlop_t op, struct sysctl_req *req)
{
	struct nfsmount *nmp = VFSTONFS(mp);
	struct vfsquery vq;
	int error;

	bzero(&vq, sizeof(vq));
	switch (op) {
#if 0
	case VFS_CTL_NOLOCKS:
		val = (nmp->nm_flag & NFSMNT_NOLOCKS) ? 1 : 0;
 		if (req->oldptr != NULL) {
 			error = SYSCTL_OUT(req, &val, sizeof(val));
 			if (error)
 				return (error);
 		}
 		if (req->newptr != NULL) {
 			error = SYSCTL_IN(req, &val, sizeof(val));
 			if (error)
 				return (error);
			if (val)
				nmp->nm_flag |= NFSMNT_NOLOCKS;
			else
				nmp->nm_flag &= ~NFSMNT_NOLOCKS;
 		}
		break;
#endif
	case VFS_CTL_QUERY:
		mtx_lock(&nmp->nm_mtx);
		if (nmp->nm_state & NFSSTA_TIMEO)
			vq.vq_flags |= VQ_NOTRESP;
		mtx_unlock(&nmp->nm_mtx);
#if 0
		if (!(nmp->nm_flag & NFSMNT_NOLOCKS) &&
		    (nmp->nm_state & NFSSTA_LOCKTIMEO))
			vq.vq_flags |= VQ_NOTRESPLOCK;
#endif
		error = SYSCTL_OUT(req, &vq, sizeof(vq));
		break;
 	case VFS_CTL_TIMEO:
 		if (req->oldptr != NULL) {
 			error = SYSCTL_OUT(req, &nmp->nm_tprintf_initial_delay,
 			    sizeof(nmp->nm_tprintf_initial_delay));
 			if (error)
 				return (error);
 		}
 		if (req->newptr != NULL) {
			error = vfs_suser(mp, req->td);
			if (error)
				return (error);
 			error = SYSCTL_IN(req, &nmp->nm_tprintf_initial_delay,
 			    sizeof(nmp->nm_tprintf_initial_delay));
 			if (error)
 				return (error);
 			if (nmp->nm_tprintf_initial_delay < 0)
 				nmp->nm_tprintf_initial_delay = 0;
 		}
		break;
	default:
		return (ENOTSUP);
	}
	return (0);
}

/*
 * Extract the information needed by the nlm from the nfs vnode.
 */
static void
nfs_getnlminfo(struct vnode *vp, uint8_t *fhp, size_t *fhlenp,
    struct sockaddr_storage *sp, int *is_v3p, off_t *sizep,
    struct timeval *timeop)
{
	struct nfsmount *nmp;
	struct nfsnode *np = VTONFS(vp);

	nmp = VFSTONFS(vp->v_mount);
	if (fhlenp != NULL)
		*fhlenp = (size_t)np->n_fhsize;
	if (fhp != NULL)
		bcopy(np->n_fhp, fhp, np->n_fhsize);
	if (sp != NULL)
		bcopy(nmp->nm_nam, sp, min(nmp->nm_nam->sa_len, sizeof(*sp)));
	if (is_v3p != NULL)
		*is_v3p = NFS_ISV3(vp);
	if (sizep != NULL)
		*sizep = np->n_size;
	if (timeop != NULL) {
		timeop->tv_sec = nmp->nm_timeo / NFS_HZ;
		timeop->tv_usec = (nmp->nm_timeo % NFS_HZ) * (1000000 / NFS_HZ);
	}
}

OpenPOWER on IntegriCloud