-
Notifications
You must be signed in to change notification settings - Fork 24
/
nfs_vfsops.c
1177 lines (1063 loc) · 29.3 KB
/
nfs_vfsops.c
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
/* $NetBSD: nfs_vfsops.c,v 1.220 2011/10/24 11:43:30 hannken Exp $ */
/*
* 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.
* 3. 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>
__KERNEL_RCSID(0, "$NetBSD: nfs_vfsops.c,v 1.220 2011/10/24 11:43:30 hannken Exp $");
#if defined(_KERNEL_OPT)
#include "opt_nfs.h"
#endif
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/signal.h>
#include <sys/proc.h>
#include <sys/namei.h>
#include <sys/device.h>
#include <sys/vnode.h>
#include <sys/kernel.h>
#include <sys/mount.h>
#include <sys/buf.h>
#include <sys/mbuf.h>
#include <sys/dirent.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sysctl.h>
#include <sys/systm.h>
#include <sys/timetc.h>
#include <sys/kauth.h>
#include <sys/module.h>
#include <net/if.h>
#include <net/route.h>
#include <netinet/in.h>
#include <nfs/rpcv2.h>
#include <nfs/nfsproto.h>
#include <nfs/nfsnode.h>
#include <nfs/nfs.h>
#include <nfs/nfsmount.h>
#include <nfs/xdr_subs.h>
#include <nfs/nfsm_subs.h>
#include <nfs/nfsdiskless.h>
#include <nfs/nfs_var.h>
MODULE(MODULE_CLASS_VFS, nfs, NULL);
extern struct nfsstats nfsstats;
extern int nfs_ticks;
/*
* keep a count of the nfs mounts to generate ficticious drive names
* for the per drive stats.
*/
unsigned int nfs_mount_count = 0;
int nfs_commitsize;
/*
* nfs vfs operations.
*/
extern const struct vnodeopv_desc nfsv2_vnodeop_opv_desc;
extern const struct vnodeopv_desc spec_nfsv2nodeop_opv_desc;
extern const struct vnodeopv_desc fifo_nfsv2nodeop_opv_desc;
const struct vnodeopv_desc * const nfs_vnodeopv_descs[] = {
&nfsv2_vnodeop_opv_desc,
&spec_nfsv2nodeop_opv_desc,
&fifo_nfsv2nodeop_opv_desc,
NULL,
};
struct vfsops nfs_vfsops = {
MOUNT_NFS,
sizeof (struct nfs_args),
nfs_mount,
nfs_start,
nfs_unmount,
nfs_root,
(void *)eopnotsupp, /* vfs_quotactl */
nfs_statvfs,
nfs_sync,
nfs_vget,
nfs_fhtovp,
nfs_vptofh,
nfs_vfs_init,
NULL,
nfs_vfs_done,
nfs_mountroot,
(int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp,
vfs_stdextattrctl,
(void *)eopnotsupp, /* vfs_suspendctl */
genfs_renamelock_enter,
genfs_renamelock_exit,
(void *)eopnotsupp,
nfs_vnodeopv_descs,
0,
{ NULL, NULL },
};
extern u_int32_t nfs_procids[NFS_NPROCS];
extern u_int32_t nfs_prog, nfs_vers;
static struct sysctllog *nfs_clog;
static int nfs_mount_diskless(struct nfs_dlmount *, const char *,
struct mount **, struct vnode **, struct lwp *);
static void nfs_sysctl_init(void);
static void nfs_sysctl_fini(void);
static int
nfs_modcmd(modcmd_t cmd, void *arg)
{
int error;
switch (cmd) {
case MODULE_CMD_INIT:
error = vfs_attach(&nfs_vfsops);
if (error == 0) {
nfs_sysctl_init();
}
return error;
case MODULE_CMD_FINI:
error = vfs_detach(&nfs_vfsops);
if (error == 0) {
nfs_sysctl_fini();
}
return error;
default:
return ENOTTY;
}
}
/*
* nfs statvfs call
*/
int
nfs_statvfs(struct mount *mp, struct statvfs *sbp)
{
struct lwp *l = curlwp;
struct vnode *vp;
struct nfs_statfs *sfp;
char *cp;
u_int32_t *tl;
int32_t t1, t2;
char *bpos, *dpos, *cp2;
struct nfsmount *nmp = VFSTONFS(mp);
int error = 0, retattr;
#ifdef NFS_V2_ONLY
const int v3 = 0;
#else
int v3 = (nmp->nm_flag & NFSMNT_NFSV3);
#endif
struct mbuf *mreq, *mrep = NULL, *md, *mb;
kauth_cred_t cred;
u_quad_t tquad;
struct nfsnode *np;
#ifndef nolint
sfp = (struct nfs_statfs *)0;
#endif
vp = nmp->nm_vnode;
np = VTONFS(vp);
cred = kauth_cred_alloc();
#ifndef NFS_V2_ONLY
if (v3 && (nmp->nm_iflag & NFSMNT_GOTFSINFO) == 0)
(void)nfs_fsinfo(nmp, vp, cred, l);
#endif
nfsstats.rpccnt[NFSPROC_FSSTAT]++;
nfsm_reqhead(np, NFSPROC_FSSTAT, NFSX_FH(v3));
nfsm_fhtom(np, v3);
nfsm_request(np, NFSPROC_FSSTAT, l, cred);
if (v3)
nfsm_postop_attr(vp, retattr, 0);
if (error) {
if (mrep != NULL) {
if (mrep->m_next != NULL)
printf("nfs_vfsops: nfs_statvfs would lose buffers\n");
m_freem(mrep);
}
goto nfsmout;
}
nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3));
sbp->f_flag = nmp->nm_flag;
sbp->f_iosize = min(nmp->nm_rsize, nmp->nm_wsize);
if (v3) {
sbp->f_frsize = sbp->f_bsize = NFS_FABLKSIZE;
tquad = fxdr_hyper(&sfp->sf_tbytes);
sbp->f_blocks = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE);
tquad = fxdr_hyper(&sfp->sf_fbytes);
sbp->f_bfree = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE);
tquad = fxdr_hyper(&sfp->sf_abytes);
tquad = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE);
sbp->f_bresvd = sbp->f_bfree - tquad;
sbp->f_bavail = tquad;
/* Handle older NFS servers returning negative values */
if ((quad_t)sbp->f_bavail < 0)
sbp->f_bavail = 0;
tquad = fxdr_hyper(&sfp->sf_tfiles);
sbp->f_files = tquad;
tquad = fxdr_hyper(&sfp->sf_ffiles);
sbp->f_ffree = tquad;
sbp->f_favail = tquad;
sbp->f_fresvd = 0;
sbp->f_namemax = NFS_MAXNAMLEN;
} else {
sbp->f_bsize = NFS_FABLKSIZE;
sbp->f_frsize = 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_fresvd = 0;
sbp->f_files = 0;
sbp->f_ffree = 0;
sbp->f_favail = 0;
sbp->f_fresvd = 0;
sbp->f_namemax = NFS_MAXNAMLEN;
}
copy_statvfs_info(sbp, mp);
nfsm_reqdone;
kauth_cred_free(cred);
return (error);
}
#ifndef NFS_V2_ONLY
/*
* nfs version 3 fsinfo rpc call
*/
int
nfs_fsinfo(struct nfsmount *nmp, struct vnode *vp, kauth_cred_t cred, struct lwp *l)
{
struct nfsv3_fsinfo *fsp;
char *cp;
int32_t t1, t2;
u_int32_t *tl, pref, xmax;
char *bpos, *dpos, *cp2;
int error = 0, retattr;
struct mbuf *mreq, *mrep, *md, *mb;
u_int64_t maxfsize;
struct nfsnode *np = VTONFS(vp);
nfsstats.rpccnt[NFSPROC_FSINFO]++;
nfsm_reqhead(np, NFSPROC_FSINFO, NFSX_FH(1));
nfsm_fhtom(np, 1);
nfsm_request(np, NFSPROC_FSINFO, l, cred);
nfsm_postop_attr(vp, retattr, 0);
if (!error) {
nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO);
pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref);
if ((nmp->nm_flag & NFSMNT_WSIZE) == 0 &&
pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE)
nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) &
~(NFS_FABLKSIZE - 1);
xmax = fxdr_unsigned(u_int32_t, fsp->fs_wtmax);
if (xmax < nmp->nm_wsize && xmax > 0) {
nmp->nm_wsize = xmax & ~(NFS_FABLKSIZE - 1);
if (nmp->nm_wsize == 0)
nmp->nm_wsize = xmax;
}
pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref);
if ((nmp->nm_flag & NFSMNT_RSIZE) == 0 &&
pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE)
nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) &
~(NFS_FABLKSIZE - 1);
xmax = fxdr_unsigned(u_int32_t, fsp->fs_rtmax);
if (xmax < nmp->nm_rsize && xmax > 0) {
nmp->nm_rsize = xmax & ~(NFS_FABLKSIZE - 1);
if (nmp->nm_rsize == 0)
nmp->nm_rsize = xmax;
}
pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref);
if (pref < nmp->nm_readdirsize && pref >= NFS_DIRFRAGSIZ)
nmp->nm_readdirsize = (pref + NFS_DIRFRAGSIZ - 1) &
~(NFS_DIRFRAGSIZ - 1);
if (xmax < nmp->nm_readdirsize && xmax > 0) {
nmp->nm_readdirsize = xmax & ~(NFS_DIRFRAGSIZ - 1);
if (nmp->nm_readdirsize == 0)
nmp->nm_readdirsize = xmax;
}
/* XXX */
nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1;
maxfsize = fxdr_hyper(&fsp->fs_maxfilesize);
if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize)
nmp->nm_maxfilesize = maxfsize;
nmp->nm_mountp->mnt_fs_bshift =
ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1;
nmp->nm_iflag |= NFSMNT_GOTFSINFO;
}
nfsm_reqdone;
return (error);
}
#endif
/*
* Mount a remote root fs via. NFS. It goes like this:
* - Call nfs_boot_init() to fill in the nfs_diskless struct
* - build the rootfs mount point and call mountnfs() to do the rest.
*/
int
nfs_mountroot(void)
{
struct timespec ts;
struct nfs_diskless *nd;
struct vattr attr;
struct mount *mp;
struct vnode *vp;
struct lwp *l;
long n;
int error;
l = curlwp; /* XXX */
if (device_class(root_device) != DV_IFNET)
return (ENODEV);
/*
* XXX time must be non-zero when we init the interface or else
* the arp code will wedge. [Fixed now in if_ether.c]
* However, the NFS attribute cache gives false "hits" when the
* current time < nfs_attrtimeo(nmp, np) so keep this in for now.
*/
if (time_second < NFS_MAXATTRTIMO) {
ts.tv_sec = NFS_MAXATTRTIMO;
ts.tv_nsec = 0;
tc_setclock(&ts);
}
/*
* Call nfs_boot_init() to fill in the nfs_diskless struct.
* Side effect: Finds and configures a network interface.
*/
nd = kmem_zalloc(sizeof(*nd), KM_SLEEP);
error = nfs_boot_init(nd, l);
if (error) {
kmem_free(nd, sizeof(*nd));
return (error);
}
/*
* Create the root mount point.
*/
error = nfs_mount_diskless(&nd->nd_root, "/", &mp, &vp, l);
if (error)
goto out;
printf("root on %s\n", nd->nd_root.ndm_host);
/*
* Link it into the mount list.
*/
mutex_enter(&mountlist_lock);
CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list);
mutex_exit(&mountlist_lock);
rootvp = vp;
mp->mnt_vnodecovered = NULLVP;
vfs_unbusy(mp, false, NULL);
/* Get root attributes (for the time). */
vn_lock(vp, LK_SHARED | LK_RETRY);
error = VOP_GETATTR(vp, &attr, l->l_cred);
VOP_UNLOCK(vp);
if (error)
panic("nfs_mountroot: getattr for root");
n = attr.va_atime.tv_sec;
#ifdef DEBUG
printf("root time: 0x%lx\n", n);
#endif
setrootfstime(n);
out:
if (error)
nfs_boot_cleanup(nd, l);
kmem_free(nd, sizeof(*nd));
return (error);
}
/*
* Internal version of mount system call for diskless setup.
* Separate function because we used to call it twice.
* (once for root and once for swap)
*/
static int
nfs_mount_diskless(struct nfs_dlmount *ndmntp, const char *mntname, struct mount **mpp, struct vnode **vpp, struct lwp *l)
/* mntname: mount point name */
{
struct mount *mp;
struct mbuf *m;
int error;
vfs_rootmountalloc(MOUNT_NFS, mntname, &mp);
mp->mnt_op = &nfs_vfsops;
/*
* Historical practice expects NFS root file systems to
* be initially mounted r/w.
*/
mp->mnt_flag &= ~MNT_RDONLY;
/* Get mbuf for server sockaddr. */
m = m_get(M_WAIT, MT_SONAME);
if (m == NULL)
panic("nfs_mountroot: mget soname for %s", mntname);
MCLAIM(m, &nfs_mowner);
memcpy(mtod(m, void *), (void *)ndmntp->ndm_args.addr,
(m->m_len = ndmntp->ndm_args.addr->sa_len));
error = mountnfs(&ndmntp->ndm_args, mp, m, mntname,
ndmntp->ndm_args.hostname, vpp, l);
if (error) {
vfs_unbusy(mp, false, NULL);
vfs_destroy(mp);
printf("nfs_mountroot: mount %s failed: %d\n",
mntname, error);
} else
*mpp = mp;
return (error);
}
void
nfs_decode_args(struct nfsmount *nmp, struct nfs_args *argp, struct lwp *l)
{
int s;
int adjsock;
int maxio;
s = splsoftnet();
/*
* Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes
* no sense in that context.
*/
if (argp->sotype == SOCK_STREAM)
argp->flags &= ~NFSMNT_NOCONN;
/*
* Cookie translation is not needed for v2, silently ignore it.
*/
if ((argp->flags & (NFSMNT_XLATECOOKIE|NFSMNT_NFSV3)) ==
NFSMNT_XLATECOOKIE)
argp->flags &= ~NFSMNT_XLATECOOKIE;
/* 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. */
nmp->nm_flag = argp->flags;
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;
}
#ifndef NFS_V2_ONLY
if (argp->flags & NFSMNT_NFSV3) {
if (argp->sotype == SOCK_DGRAM)
maxio = NFS_MAXDGRAMDATA;
else
maxio = NFS_MAXDATA;
} else
#endif
maxio = NFS_V2MAXDATA;
if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) {
int osize = nmp->nm_wsize;
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;
adjsock |= (nmp->nm_wsize != osize);
}
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) {
int osize = nmp->nm_rsize;
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;
adjsock |= (nmp->nm_rsize != osize);
}
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;
/* Round down to multiple of minimum blocksize */
nmp->nm_readdirsize &= ~(NFS_DIRFRAGSIZ - 1);
if (nmp->nm_readdirsize < NFS_DIRFRAGSIZ)
nmp->nm_readdirsize = NFS_DIRFRAGSIZ;
/* Bigger than buffer size makes no sense */
if (nmp->nm_readdirsize > NFS_DIRBLKSIZ)
nmp->nm_readdirsize = NFS_DIRBLKSIZ;
} else if (argp->flags & NFSMNT_RSIZE)
nmp->nm_readdirsize = nmp->nm_rsize;
if (nmp->nm_readdirsize > maxio)
nmp->nm_readdirsize = maxio;
if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 &&
argp->maxgrouplist <= NFS_MAXGRPS)
nmp->nm_numgrps = argp->maxgrouplist;
if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 &&
argp->readahead <= NFS_MAXRAHEAD)
nmp->nm_readahead = argp->readahead;
if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1 &&
argp->deadthresh <= NFS_NEVERDEAD)
nmp->nm_deadthresh = argp->deadthresh;
adjsock |= ((nmp->nm_sotype != argp->sotype) ||
(nmp->nm_soproto != argp->proto));
nmp->nm_sotype = argp->sotype;
nmp->nm_soproto = argp->proto;
if (nmp->nm_so && adjsock) {
nfs_safedisconnect(nmp);
if (nmp->nm_sotype == SOCK_DGRAM)
while (nfs_connect(nmp, (struct nfsreq *)0, l)) {
printf("nfs_args: retrying connect\n");
kpause("nfscn3", false, hz, NULL);
}
}
}
/*
* VFS Operations.
*
* mount system call
* It seems a bit dumb to copyinstr() the host and path here and then
* memcpy() 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 */
int
nfs_mount(struct mount *mp, const char *path, void *data, size_t *data_len)
{
struct lwp *l = curlwp;
int error;
struct nfs_args *args = data;
struct mbuf *nam;
struct nfsmount *nmp = VFSTONFS(mp);
struct sockaddr *sa;
struct vnode *vp;
char *pth, *hst;
struct proc *p;
size_t len;
u_char *nfh;
if (*data_len < sizeof *args)
return EINVAL;
p = l->l_proc;
if (mp->mnt_flag & MNT_GETARGS) {
if (nmp == NULL)
return (EIO);
if (args->addr != NULL) {
sa = mtod(nmp->nm_nam, struct sockaddr *);
error = copyout(sa, args->addr, sa->sa_len);
if (error)
return (error);
args->addrlen = sa->sa_len;
} else
args->addrlen = 0;
args->version = NFS_ARGSVERSION;
args->sotype = nmp->nm_sotype;
args->proto = nmp->nm_soproto;
args->fh = NULL;
args->fhsize = 0;
args->flags = nmp->nm_flag;
args->wsize = nmp->nm_wsize;
args->rsize = nmp->nm_rsize;
args->readdirsize = nmp->nm_readdirsize;
args->timeo = nmp->nm_timeo;
args->retrans = nmp->nm_retry;
args->maxgrouplist = nmp->nm_numgrps;
args->readahead = nmp->nm_readahead;
args->leaseterm = 0; /* dummy */
args->deadthresh = nmp->nm_deadthresh;
args->hostname = NULL;
*data_len = sizeof *args;
return 0;
}
if (args->version != NFS_ARGSVERSION)
return (EPROGMISMATCH);
if (args->flags & (NFSMNT_NQNFS|NFSMNT_KERB))
return (EPROGUNAVAIL);
#ifdef NFS_V2_ONLY
if (args->flags & NFSMNT_NFSV3)
return (EPROGMISMATCH);
#endif
if (mp->mnt_flag & MNT_UPDATE) {
if (nmp == NULL)
return (EIO);
/*
* When doing an update, we can't change from or to
* v3, or change cookie translation
*/
args->flags = (args->flags & ~(NFSMNT_NFSV3|NFSMNT_XLATECOOKIE)) |
(nmp->nm_flag & (NFSMNT_NFSV3|NFSMNT_XLATECOOKIE));
nfs_decode_args(nmp, args, l);
return (0);
}
if (args->fhsize < 0 || args->fhsize > NFSX_V3FHMAX)
return (EINVAL);
nfh = malloc(NFSX_V3FHMAX, M_TEMP, M_WAITOK);
error = copyin(args->fh, nfh, args->fhsize);
if (error)
goto free_nfh;
pth = malloc(MNAMELEN, M_TEMP, M_WAITOK);
error = copyinstr(path, pth, MNAMELEN - 1, &len);
if (error)
goto free_pth;
memset(&pth[len], 0, MNAMELEN - len);
hst = malloc(MNAMELEN, M_TEMP, M_WAITOK);
error = copyinstr(args->hostname, hst, MNAMELEN - 1, &len);
if (error)
goto free_hst;
memset(&hst[len], 0, MNAMELEN - len);
/* sockargs() call must be after above copyin() calls */
error = sockargs(&nam, args->addr, args->addrlen, MT_SONAME);
if (error)
goto free_hst;
MCLAIM(nam, &nfs_mowner);
args->fh = nfh;
error = mountnfs(args, mp, nam, pth, hst, &vp, l);
free_hst:
free(hst, M_TEMP);
free_pth:
free(pth, M_TEMP);
free_nfh:
free(nfh, M_TEMP);
return (error);
}
/*
* Common code for mount and mountroot
*/
int
mountnfs(struct nfs_args *argp, struct mount *mp, struct mbuf *nam, const char *pth, const char *hst, struct vnode **vpp, struct lwp *l)
{
struct nfsmount *nmp;
struct nfsnode *np;
struct vnode *vp;
int error;
struct vattr *attrs;
kauth_cred_t cr;
char iosname[IOSTATNAMELEN];
/*
* If the number of nfs iothreads to use has never
* been set, create a reasonable number of them.
*/
if (nfs_niothreads < 0) {
nfs_set_niothreads(NFS_DEFAULT_NIOTHREADS);
}
if (mp->mnt_flag & MNT_UPDATE) {
nmp = VFSTONFS(mp);
/* update paths, file handles, etc, here XXX */
m_freem(nam);
return (0);
} else {
nmp = kmem_zalloc(sizeof(*nmp), KM_SLEEP);
mp->mnt_data = nmp;
TAILQ_INIT(&nmp->nm_uidlruhead);
TAILQ_INIT(&nmp->nm_bufq);
rw_init(&nmp->nm_writeverflock);
mutex_init(&nmp->nm_lock, MUTEX_DEFAULT, IPL_NONE);
rw_init(&nmp->nm_rbtlock);
cv_init(&nmp->nm_rcvcv, "nfsrcv");
cv_init(&nmp->nm_sndcv, "nfssnd");
cv_init(&nmp->nm_aiocv, "nfsaio");
cv_init(&nmp->nm_disconcv, "nfsdis");
nfs_rbtinit(nmp);
}
vfs_getnewfsid(mp);
nmp->nm_mountp = mp;
#ifndef NFS_V2_ONLY
if ((argp->flags & NFSMNT_NFSV3) == 0)
#endif
{
if (argp->fhsize != NFSX_V2FH) {
return EINVAL;
}
}
/*
* V2 can only handle 32 bit filesizes. For v3, nfs_fsinfo
* will overwrite this.
*/
nmp->nm_maxfilesize = 0xffffffffLL;
nmp->nm_timeo = NFS_TIMEO;
nmp->nm_retry = NFS_RETRANS;
nmp->nm_wsize = NFS_WSIZE;
nmp->nm_rsize = NFS_RSIZE;
nmp->nm_readdirsize = NFS_READDIRSIZE;
nmp->nm_numgrps = NFS_MAXGRPS;
nmp->nm_readahead = NFS_DEFRAHEAD;
nmp->nm_deadthresh = NFS_DEFDEADTHRESH;
error = set_statvfs_info(pth, UIO_SYSSPACE, hst, UIO_SYSSPACE,
mp->mnt_op->vfs_name, mp, l);
if (error)
goto bad;
nmp->nm_nam = nam;
/* Set up the sockets and per-host congestion */
nmp->nm_sotype = argp->sotype;
nmp->nm_soproto = argp->proto;
nfs_decode_args(nmp, argp, l);
mp->mnt_fs_bshift = ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1;
mp->mnt_dev_bshift = DEV_BSHIFT;
/*
* 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, (struct nfsreq *)0, l)))
goto bad;
/*
* This is silly, but it has to be set so that vinifod() works.
* We do not want to do an nfs_statvfs() here since we can get
* stuck on a dead server and we are holding a lock on the mount
* point.
*/
mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA;
error = nfs_nget(mp, (nfsfh_t *)argp->fh, argp->fhsize, &np);
if (error)
goto bad;
vp = NFSTOV(np);
attrs = malloc(sizeof(struct vattr), M_TEMP, M_WAITOK);
VOP_GETATTR(vp, attrs, l->l_cred);
if ((nmp->nm_flag & NFSMNT_NFSV3) && (vp->v_type == VDIR)) {
cr = kauth_cred_alloc();
kauth_cred_setuid(cr, attrs->va_uid);
kauth_cred_seteuid(cr, attrs->va_uid);
kauth_cred_setsvuid(cr, attrs->va_uid);
kauth_cred_setgid(cr, attrs->va_gid);
kauth_cred_setegid(cr, attrs->va_gid);
kauth_cred_setsvgid(cr, attrs->va_gid);
nfs_cookieheuristic(vp, &nmp->nm_iflag, l, cr);
kauth_cred_free(cr);
}
free(attrs, M_TEMP);
/*
* 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). So, just unlock, but no rele.
*/
nmp->nm_vnode = vp;
if (vp->v_type == VNON)
vp->v_type = VDIR;
vp->v_vflag |= VV_ROOT;
VOP_UNLOCK(vp);
*vpp = vp;
snprintf(iosname, sizeof(iosname), "nfs%u", nfs_mount_count++);
nmp->nm_stats = iostat_alloc(IOSTAT_NFS, nmp, iosname);
return (0);
bad:
nfs_disconnect(nmp);
rw_destroy(&nmp->nm_writeverflock);
rw_destroy(&nmp->nm_rbtlock);
mutex_destroy(&nmp->nm_lock);
cv_destroy(&nmp->nm_rcvcv);
cv_destroy(&nmp->nm_sndcv);
cv_destroy(&nmp->nm_aiocv);
cv_destroy(&nmp->nm_disconcv);
kmem_free(nmp, sizeof(*nmp));
m_freem(nam);
return (error);
}
/*
* unmount system call
*/
int
nfs_unmount(struct mount *mp, int mntflags)
{
struct nfsmount *nmp;
struct vnode *vp;
int error, flags = 0;
if (mntflags & MNT_FORCE)
flags |= FORCECLOSE;
nmp = VFSTONFS(mp);
/*
* Goes something like this..
* - Check for activity on the root vnode (other than ourselves).
* - Call vflush() to clear out vnodes for this file system,
* except for the root vnode.
* - Decrement reference on the vnode representing remote root.
* - Close the socket
* - Free up the data structures
*/
/*
* We need to decrement the ref. count on the nfsnode representing
* the remote root. See comment in mountnfs().
*/
vp = nmp->nm_vnode;
error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
if (error != 0)
return error;
if ((mntflags & MNT_FORCE) == 0 && vp->v_usecount > 1) {
VOP_UNLOCK(vp);
return (EBUSY);
}
error = vflush(mp, vp, flags);
if (error) {
VOP_UNLOCK(vp);
return (error);
}
/*
* We are now committed to the unmount; mark the mount structure
* as doomed so that any sleepers kicked awake by nfs_disconnect
* will go away cleanly.
*/
nmp->nm_iflag |= NFSMNT_DISMNT;
/*
* Clean up the stats... note that we carefully avoid decrementing
* nfs_mount_count here for good reason - we may not be unmounting
* the last thing mounted.
*/
iostat_free(nmp->nm_stats);
/*
* There is one reference count to get rid of here
* (see comment in mountnfs()).
*/
VOP_UNLOCK(vp);
vgone(vp);
nfs_disconnect(nmp);
m_freem(nmp->nm_nam);
rw_destroy(&nmp->nm_writeverflock);
rw_destroy(&nmp->nm_rbtlock);
mutex_destroy(&nmp->nm_lock);
cv_destroy(&nmp->nm_rcvcv);
cv_destroy(&nmp->nm_sndcv);
cv_destroy(&nmp->nm_aiocv);
cv_destroy(&nmp->nm_disconcv);
kmem_free(nmp, sizeof(*nmp));
return (0);
}
/*
* Return root of a filesystem
*/
int
nfs_root(struct mount *mp, struct vnode **vpp)
{
struct vnode *vp;
struct nfsmount *nmp;
int error;
nmp = VFSTONFS(mp);
vp = nmp->nm_vnode;
vref(vp);
error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
if (error != 0) {
vrele(vp);
return error;
}
*vpp = vp;
return (0);
}
extern int syncprt;
/*
* Flush out the buffer cache
*/
/* ARGSUSED */
int
nfs_sync(struct mount *mp, int waitfor, kauth_cred_t cred)
{
struct vnode *vp, *mvp;
int error, allerror = 0;
/*
* Force stale buffer cache information to be flushed.
*/
mvp = vnalloc(mp);
loop:
/*
* NOTE: not using the TAILQ_FOREACH here since in this loop vgone()
* and vclean() can be called indirectly
*/
mutex_enter(&mntvnode_lock);
for (vp = TAILQ_FIRST(&mp->mnt_vnodelist); vp; vp = vunmark(mvp)) {
vmark(mvp, vp);
if (vp->v_mount != mp || vismarker(vp))
continue;
mutex_enter(vp->v_interlock);
/* XXX MNT_LAZY cannot be right? */
if (waitfor == MNT_LAZY ||
(LIST_EMPTY(&vp->v_dirtyblkhd) &&
UVM_OBJ_IS_CLEAN(&vp->v_uobj))) {
mutex_exit(vp->v_interlock);
continue;
}
mutex_exit(&mntvnode_lock);
error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT);
if (error != 0) {
if (error != ENOENT) {
mutex_enter(&mntvnode_lock);
continue;
}
(void)vunmark(mvp);
goto loop;
}
error = VOP_FSYNC(vp, cred,
waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0);
if (error)
allerror = error;
vput(vp);
mutex_enter(&mntvnode_lock);
}
mutex_exit(&mntvnode_lock);
vnfree(mvp);
return (allerror);
}
/*
* NFS flat namespace lookup.