1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright (c) 1992, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright (c) 2011 Bayard G. Bell. All rights reserved.
24 */
25
26 #include <sys/param.h>
27 #include <sys/errno.h>
28 #include <sys/proc.h>
29 #include <sys/disp.h>
30 #include <sys/vfs.h>
31 #include <sys/vfs_opreg.h>
32 #include <sys/vnode.h>
33 #include <sys/uio.h>
34 #include <sys/kmem.h>
35 #include <sys/cred.h>
36 #include <sys/statvfs.h>
37 #include <sys/mount.h>
38 #include <sys/tiuser.h>
39 #include <sys/cmn_err.h>
40 #include <sys/debug.h>
41 #include <sys/systm.h>
42 #include <sys/sysmacros.h>
43 #include <sys/pathname.h>
44 #include <rpc/types.h>
45 #include <rpc/auth.h>
46 #include <rpc/clnt.h>
47 #include <fs/fs_subr.h>
48 #include <sys/fs/autofs.h>
49 #include <sys/modctl.h>
50 #include <sys/mntent.h>
51 #include <sys/policy.h>
52 #include <sys/zone.h>
53
54 static int autofs_init(int, char *);
55
56 static major_t autofs_major;
57 static minor_t autofs_minor;
58
59 kmutex_t autofs_minor_lock;
60 zone_key_t autofs_key;
61
62 static mntopts_t auto_mntopts;
63
64 /*
65 * The AUTOFS system call.
66 */
67 static struct sysent autofssysent = {
68 2,
69 SE_32RVAL1 | SE_ARGC | SE_NOUNLOAD,
70 autofssys
71 };
72
73 static struct modlsys modlsys = {
74 &mod_syscallops,
75 "AUTOFS syscall",
76 &autofssysent
77 };
78
79 #ifdef _SYSCALL32_IMPL
80 static struct modlsys modlsys32 = {
81 &mod_syscallops32,
82 "AUTOFS syscall (32-bit)",
83 &autofssysent
84 };
85 #endif /* _SYSCALL32_IMPL */
86
87 static vfsdef_t vfw = {
88 VFSDEF_VERSION,
89 "autofs",
90 autofs_init,
91 VSW_HASPROTO|VSW_CANRWRO|VSW_CANREMOUNT|VSW_STATS|VSW_ZMOUNT,
92 &auto_mntopts
93 };
94
95 /*
96 * Module linkage information for the kernel.
97 */
98 static struct modlfs modlfs = {
99 &mod_fsops, "filesystem for autofs", &vfw
100 };
101
102 static struct modlinkage modlinkage = {
103 MODREV_1,
104 &modlfs,
105 &modlsys,
106 #ifdef _SYSCALL32_IMPL
107 &modlsys32,
108 #endif
109 NULL
110 };
111
112 /*
113 * This is the module initialization routine.
114 */
115 int
116 _init(void)
117 {
118 return (mod_install(&modlinkage));
119 }
120
121 int
122 _fini(void)
123 {
124 /*
125 * Don't allow the autofs module to be unloaded for now.
126 */
127 return (EBUSY);
128 }
129
130 int
131 _info(struct modinfo *modinfop)
132 {
133 return (mod_info(&modlinkage, modinfop));
134 }
135
136 static int autofs_fstype;
137
138 /*
139 * autofs VFS operations
140 */
141 static int auto_mount(vfs_t *, vnode_t *, struct mounta *, cred_t *);
142 static int auto_unmount(vfs_t *, int, cred_t *);
143 static int auto_root(vfs_t *, vnode_t **);
144 static int auto_statvfs(vfs_t *, struct statvfs64 *);
145
146 /*
147 * Auto Mount options table
148 */
149
150 static char *direct_cancel[] = { MNTOPT_INDIRECT, NULL };
151 static char *indirect_cancel[] = { MNTOPT_DIRECT, NULL };
152 static char *browse_cancel[] = { MNTOPT_NOBROWSE, NULL };
153 static char *nobrowse_cancel[] = { MNTOPT_BROWSE, NULL };
154
155 static mntopt_t mntopts[] = {
156 /*
157 * option name cancel options default arg flags
158 */
159 { MNTOPT_DIRECT, direct_cancel, NULL, 0,
160 NULL },
161 { MNTOPT_INDIRECT, indirect_cancel, NULL, 0,
162 NULL },
163 { MNTOPT_IGNORE, NULL, NULL,
164 MO_DEFAULT|MO_TAG, NULL },
165 { "nest", NULL, NULL, MO_TAG,
166 NULL },
167 { MNTOPT_BROWSE, browse_cancel, NULL, MO_TAG,
168 NULL },
169 { MNTOPT_NOBROWSE, nobrowse_cancel, NULL, MO_TAG,
170 NULL },
171 { MNTOPT_RESTRICT, NULL, NULL, MO_TAG,
172 NULL },
173 };
174
175 static mntopts_t auto_mntopts = {
176 sizeof (mntopts) / sizeof (mntopt_t),
177 mntopts
178 };
179
180 /*ARGSUSED*/
181 static void
182 autofs_zone_destructor(zoneid_t zoneid, void *arg)
183 {
184 struct autofs_globals *fngp = arg;
185 vnode_t *vp;
186
187 if (fngp == NULL)
188 return;
189 ASSERT(fngp->fng_fnnode_count == 1);
190 ASSERT(fngp->fng_unmount_threads == 0);
191
192 if (fngp->fng_autofs_daemon_dh != NULL)
193 door_ki_rele(fngp->fng_autofs_daemon_dh);
194 /*
195 * vn_alloc() initialized the rootnode with a count of 1; we need to
196 * make this 0 to placate auto_freefnnode().
197 */
198 vp = fntovn(fngp->fng_rootfnnodep);
199 ASSERT(vp->v_count == 1);
200 vp->v_count--;
201 auto_freefnnode(fngp->fng_rootfnnodep);
202 mutex_destroy(&fngp->fng_unmount_threads_lock);
203 kmem_free(fngp, sizeof (*fngp));
204 }
205
206 /*
207 * rootfnnodep is allocated here. Its sole purpose is to provide
208 * read/write locking for top level fnnodes. This object is
209 * persistent and will not be deallocated until the zone is destroyed.
210 *
211 * The current zone is implied as the zone of interest, since we will be
212 * calling zthread_create() which must be called from the correct zone.
213 */
214 struct autofs_globals *
215 autofs_zone_init(void)
216 {
217 char rootname[sizeof ("root_fnnode_zone_") + ZONEID_WIDTH];
218 struct autofs_globals *fngp;
219 zoneid_t zoneid = getzoneid();
220
221 fngp = kmem_zalloc(sizeof (*fngp), KM_SLEEP);
222 (void) snprintf(rootname, sizeof (rootname), "root_fnnode_zone_%d",
223 zoneid);
224 fngp->fng_rootfnnodep = auto_makefnnode(VNON, NULL, rootname, CRED(),
225 fngp);
226 /*
227 * Don't need to hold fng_rootfnnodep as it's never really used for
228 * anything.
229 */
230 fngp->fng_fnnode_count = 1;
231 fngp->fng_printed_not_running_msg = 0;
232 fngp->fng_zoneid = zoneid;
233 mutex_init(&fngp->fng_unmount_threads_lock, NULL, MUTEX_DEFAULT,
234 NULL);
235 fngp->fng_unmount_threads = 0;
236
237 mutex_init(&fngp->fng_autofs_daemon_lock, NULL, MUTEX_DEFAULT, NULL);
238
239 /*
240 * Start the unmounter thread for this zone.
241 */
242 (void) zthread_create(NULL, 0, auto_do_unmount, fngp, 0, minclsyspri);
243 return (fngp);
244 }
245
246 int
247 autofs_init(int fstype, char *name)
248 {
249 static const fs_operation_def_t auto_vfsops_template[] = {
250 VFSNAME_MOUNT, { .vfs_mount = auto_mount },
251 VFSNAME_UNMOUNT, { .vfs_unmount = auto_unmount },
252 VFSNAME_ROOT, { .vfs_root = auto_root },
253 VFSNAME_STATVFS, { .vfs_statvfs = auto_statvfs },
254 NULL, NULL
255 };
256 int error;
257
258 autofs_fstype = fstype;
259 ASSERT(autofs_fstype != 0);
260 /*
261 * Associate VFS ops vector with this fstype
262 */
263 error = vfs_setfsops(fstype, auto_vfsops_template, NULL);
264 if (error != 0) {
265 cmn_err(CE_WARN, "autofs_init: bad vfs ops template");
266 return (error);
267 }
268
269 error = vn_make_ops(name, auto_vnodeops_template, &auto_vnodeops);
270 if (error != 0) {
271 (void) vfs_freevfsops_by_type(fstype);
272 cmn_err(CE_WARN, "autofs_init: bad vnode ops template");
273 return (error);
274 }
275
276 mutex_init(&autofs_minor_lock, NULL, MUTEX_DEFAULT, NULL);
277 /*
278 * Assign unique major number for all autofs mounts
279 */
280 if ((autofs_major = getudev()) == (major_t)-1) {
281 cmn_err(CE_WARN,
282 "autofs: autofs_init: can't get unique device number");
283 mutex_destroy(&autofs_minor_lock);
284 return (1);
285 }
286
287 /*
288 * We'd like to be able to provide a constructor here, but we can't
289 * since it wants to zthread_create(), something it can't do in a ZSD
290 * constructor.
291 */
292 zone_key_create(&autofs_key, NULL, NULL, autofs_zone_destructor);
293
294 return (0);
295 }
296
297 static char *restropts[] = {
298 RESTRICTED_MNTOPTS
299 };
300
301 /*
302 * This routine adds those options to the option string `buf' which are
303 * forced by secpolicy_fs_mount. If the automatic "security" options
304 * are set, the option string gets them added if they aren't already
305 * there. We search the string with "strstr" and make sure that
306 * the string we find is bracketed with <start|",">MNTOPT<","|"\0">
307 *
308 * This is one half of the option inheritence algorithm which
309 * implements the "restrict" option. The other half is implemented
310 * in automountd; it takes its cue from the options we add here.
311 */
312 static int
313 autofs_restrict_opts(struct vfs *vfsp, char *buf, size_t maxlen, size_t *curlen)
314 {
315 int i;
316 char *p;
317 size_t len = *curlen - 1;
318
319 /* Unrestricted */
320 if (!vfs_optionisset(vfsp, restropts[0], NULL))
321 return (0);
322
323 for (i = 0; i < sizeof (restropts)/sizeof (restropts[0]); i++) {
324 size_t olen = strlen(restropts[i]);
325
326 /* Add "restrict" always and the others insofar set */
327 if ((i == 0 || vfs_optionisset(vfsp, restropts[i], NULL)) &&
328 ((p = strstr(buf, restropts[i])) == NULL ||
329 !((p == buf || p[-1] == ',') &&
330 (p[olen] == '\0' || p[olen] == ',')))) {
331
332 if (len + olen + 1 > maxlen)
333 return (-1);
334
335 if (*buf != '\0')
336 buf[len++] = ',';
337 (void) strcpy(&buf[len], restropts[i]);
338 len += olen;
339 }
340 }
341 *curlen = len + 1;
342 return (0);
343 }
344
345 /* ARGSUSED */
346 static int
347 auto_mount(vfs_t *vfsp, vnode_t *vp, struct mounta *uap, cred_t *cr)
348 {
349 int error;
350 size_t len = 0;
351 autofs_args args;
352 fninfo_t *fnip = NULL;
353 vnode_t *rootvp = NULL;
354 fnnode_t *rootfnp = NULL;
355 char *data = uap->dataptr;
356 char datalen = uap->datalen;
357 dev_t autofs_dev;
358 char strbuff[MAXPATHLEN + 1];
359 vnode_t *kkvp;
360 struct autofs_globals *fngp;
361 zone_t *zone = curproc->p_zone;
362
363 AUTOFS_DPRINT((4, "auto_mount: vfs %p vp %p\n", (void *)vfsp,
364 (void *)vp));
365
366 if ((error = secpolicy_fs_mount(cr, vp, vfsp)) != 0)
367 return (EPERM);
368
369 if (zone == global_zone) {
370 zone_t *mntzone;
371
372 mntzone = zone_find_by_path(refstr_value(vfsp->vfs_mntpt));
373 ASSERT(mntzone != NULL);
374 zone_rele(mntzone);
375 if (mntzone != zone) {
376 return (EBUSY);
377 }
378 }
379
380 /*
381 * Stop the mount from going any further if the zone is going away.
382 */
383 if (zone_status_get(zone) >= ZONE_IS_SHUTTING_DOWN)
384 return (EBUSY);
385
386 /*
387 * We need a lock to serialize this; minor_lock is as good as any.
388 */
389 mutex_enter(&autofs_minor_lock);
390 if ((fngp = zone_getspecific(autofs_key, zone)) == NULL) {
391 fngp = autofs_zone_init();
392 (void) zone_setspecific(autofs_key, zone, fngp);
393 }
394 mutex_exit(&autofs_minor_lock);
395 ASSERT(fngp != NULL);
396
397 /*
398 * Get arguments
399 */
400 if (uap->flags & MS_SYSSPACE) {
401 if (datalen != sizeof (args))
402 return (EINVAL);
403 error = kcopy(data, &args, sizeof (args));
404 } else {
405 if (get_udatamodel() == DATAMODEL_NATIVE) {
406 if (datalen != sizeof (args))
407 return (EINVAL);
408 error = copyin(data, &args, sizeof (args));
409 } else {
410 struct autofs_args32 args32;
411
412 if (datalen != sizeof (args32))
413 return (EINVAL);
414 error = copyin(data, &args32, sizeof (args32));
415
416 args.addr.maxlen = args32.addr.maxlen;
417 args.addr.len = args32.addr.len;
418 args.addr.buf = (char *)(uintptr_t)args32.addr.buf;
419 args.path = (char *)(uintptr_t)args32.path;
420 args.opts = (char *)(uintptr_t)args32.opts;
421 args.map = (char *)(uintptr_t)args32.map;
422 args.subdir = (char *)(uintptr_t)args32.subdir;
423 args.key = (char *)(uintptr_t)args32.key;
424 args.mount_to = args32.mount_to;
425 args.rpc_to = args32.rpc_to;
426 args.direct = args32.direct;
427 }
428 }
429 if (error)
430 return (EFAULT);
431
432 /*
433 * For a remount, only update mount information
434 * i.e. default mount options, map name, etc.
435 */
436 if (uap->flags & MS_REMOUNT) {
437 fnip = vfstofni(vfsp);
438 if (fnip == NULL)
439 return (EINVAL);
440
441 if (args.direct == 1)
442 fnip->fi_flags |= MF_DIRECT;
443 else
444 fnip->fi_flags &= ~MF_DIRECT;
445 fnip->fi_mount_to = args.mount_to;
446 fnip->fi_rpc_to = args.rpc_to;
447
448 /*
449 * Get default options
450 */
451 if (uap->flags & MS_SYSSPACE)
452 error = copystr(args.opts, strbuff, sizeof (strbuff),
453 &len);
454 else
455 error = copyinstr(args.opts, strbuff, sizeof (strbuff),
456 &len);
457 if (error)
458 return (EFAULT);
459
460 if (autofs_restrict_opts(vfsp, strbuff, sizeof (strbuff), &len)
461 != 0) {
462 return (EFAULT);
463 }
464
465 kmem_free(fnip->fi_opts, fnip->fi_optslen);
466 fnip->fi_opts = kmem_alloc(len, KM_SLEEP);
467 fnip->fi_optslen = (int)len;
468 bcopy(strbuff, fnip->fi_opts, len);
469
470 /*
471 * Get context/map name
472 */
473 if (uap->flags & MS_SYSSPACE)
474 error = copystr(args.map, strbuff, sizeof (strbuff),
475 &len);
476 else
477 error = copyinstr(args.map, strbuff, sizeof (strbuff),
478 &len);
479 if (error)
480 return (EFAULT);
481
482 kmem_free(fnip->fi_map, fnip->fi_maplen);
483 fnip->fi_map = kmem_alloc(len, KM_SLEEP);
484 fnip->fi_maplen = (int)len;
485 bcopy(strbuff, fnip->fi_map, len);
486
487 return (0);
488 }
489
490 /*
491 * Allocate fninfo struct and attach it to vfs
492 */
493 fnip = kmem_zalloc(sizeof (*fnip), KM_SLEEP);
494 fnip->fi_mountvfs = vfsp;
495
496 fnip->fi_mount_to = args.mount_to;
497 fnip->fi_rpc_to = args.rpc_to;
498 fnip->fi_refcnt = 0;
499 vfsp->vfs_bsize = AUTOFS_BLOCKSIZE;
500 vfsp->vfs_fstype = autofs_fstype;
501
502 /*
503 * Assign a unique device id to the mount
504 */
505 mutex_enter(&autofs_minor_lock);
506 do {
507 autofs_minor = (autofs_minor + 1) & L_MAXMIN32;
508 autofs_dev = makedevice(autofs_major, autofs_minor);
509 } while (vfs_devismounted(autofs_dev));
510 mutex_exit(&autofs_minor_lock);
511 vfsp->vfs_dev = autofs_dev;
512 vfs_make_fsid(&vfsp->vfs_fsid, autofs_dev, autofs_fstype);
513 vfsp->vfs_data = (void *)fnip;
514 vfsp->vfs_bcount = 0;
515
516 /*
517 * Get daemon address
518 */
519 fnip->fi_addr.len = args.addr.len;
520 fnip->fi_addr.maxlen = fnip->fi_addr.len;
521 fnip->fi_addr.buf = kmem_alloc(args.addr.len, KM_SLEEP);
522 if (uap->flags & MS_SYSSPACE)
523 error = kcopy(args.addr.buf, fnip->fi_addr.buf, args.addr.len);
524 else
525 error = copyin(args.addr.buf, fnip->fi_addr.buf, args.addr.len);
526 if (error) {
527 error = EFAULT;
528 goto errout;
529 }
530
531 fnip->fi_zoneid = getzoneid();
532 /*
533 * Get path for mountpoint
534 */
535 if (uap->flags & MS_SYSSPACE)
536 error = copystr(args.path, strbuff, sizeof (strbuff), &len);
537 else
538 error = copyinstr(args.path, strbuff, sizeof (strbuff), &len);
539 if (error) {
540 error = EFAULT;
541 goto errout;
542 }
543 fnip->fi_path = kmem_alloc(len, KM_SLEEP);
544 fnip->fi_pathlen = (int)len;
545 bcopy(strbuff, fnip->fi_path, len);
546
547 /*
548 * Get default options
549 */
550 if (uap->flags & MS_SYSSPACE)
551 error = copystr(args.opts, strbuff, sizeof (strbuff), &len);
552 else
553 error = copyinstr(args.opts, strbuff, sizeof (strbuff), &len);
554
555 if (error != 0 ||
556 autofs_restrict_opts(vfsp, strbuff, sizeof (strbuff), &len) != 0) {
557 error = EFAULT;
558 goto errout;
559 }
560 fnip->fi_opts = kmem_alloc(len, KM_SLEEP);
561 fnip->fi_optslen = (int)len;
562 bcopy(strbuff, fnip->fi_opts, len);
563
564 /*
565 * Get context/map name
566 */
567 if (uap->flags & MS_SYSSPACE)
568 error = copystr(args.map, strbuff, sizeof (strbuff), &len);
569 else
570 error = copyinstr(args.map, strbuff, sizeof (strbuff), &len);
571 if (error) {
572 error = EFAULT;
573 goto errout;
574 }
575 fnip->fi_map = kmem_alloc(len, KM_SLEEP);
576 fnip->fi_maplen = (int)len;
577 bcopy(strbuff, fnip->fi_map, len);
578
579 /*
580 * Get subdirectory within map
581 */
582 if (uap->flags & MS_SYSSPACE)
583 error = copystr(args.subdir, strbuff, sizeof (strbuff), &len);
584 else
585 error = copyinstr(args.subdir, strbuff, sizeof (strbuff), &len);
586 if (error) {
587 error = EFAULT;
588 goto errout;
589 }
590 fnip->fi_subdir = kmem_alloc(len, KM_SLEEP);
591 fnip->fi_subdirlen = (int)len;
592 bcopy(strbuff, fnip->fi_subdir, len);
593
594 /*
595 * Get the key
596 */
597 if (uap->flags & MS_SYSSPACE)
598 error = copystr(args.key, strbuff, sizeof (strbuff), &len);
599 else
600 error = copyinstr(args.key, strbuff, sizeof (strbuff), &len);
601 if (error) {
602 error = EFAULT;
603 goto errout;
604 }
605 fnip->fi_key = kmem_alloc(len, KM_SLEEP);
606 fnip->fi_keylen = (int)len;
607 bcopy(strbuff, fnip->fi_key, len);
608
609 /*
610 * Is this a direct mount?
611 */
612 if (args.direct == 1)
613 fnip->fi_flags |= MF_DIRECT;
614
615 /*
616 * Setup netconfig.
617 * Can I pass in knconf as mount argument? what
618 * happens when the daemon gets restarted?
619 */
620 if ((error = lookupname("/dev/ticotsord", UIO_SYSSPACE, FOLLOW,
621 NULLVPP, &kkvp)) != 0) {
622 cmn_err(CE_WARN, "autofs: lookupname: %d", error);
623 goto errout;
624 }
625
626 fnip->fi_knconf.knc_rdev = kkvp->v_rdev;
627 fnip->fi_knconf.knc_protofmly = NC_LOOPBACK;
628 fnip->fi_knconf.knc_semantics = NC_TPI_COTS_ORD;
629 VN_RELE(kkvp);
630
631 /*
632 * Make the root vnode
633 */
634 rootfnp = auto_makefnnode(VDIR, vfsp, fnip->fi_path, cr, fngp);
635 if (rootfnp == NULL) {
636 error = ENOMEM;
637 goto errout;
638 }
639 rootvp = fntovn(rootfnp);
640
641 rootvp->v_flag |= VROOT;
642 rootfnp->fn_mode = AUTOFS_MODE;
643 rootfnp->fn_parent = rootfnp;
644 /* account for ".." entry */
645 rootfnp->fn_linkcnt = rootfnp->fn_size = 1;
646 fnip->fi_rootvp = rootvp;
647
648 /*
649 * Add to list of top level AUTOFS' if it is being mounted by
650 * a user level process.
651 */
652 if (!(uap->flags & MS_SYSSPACE)) {
653 rw_enter(&fngp->fng_rootfnnodep->fn_rwlock, RW_WRITER);
654 rootfnp->fn_parent = fngp->fng_rootfnnodep;
655 rootfnp->fn_next = fngp->fng_rootfnnodep->fn_dirents;
656 fngp->fng_rootfnnodep->fn_dirents = rootfnp;
657 rw_exit(&fngp->fng_rootfnnodep->fn_rwlock);
658 }
659
660 AUTOFS_DPRINT((5, "auto_mount: vfs %p root %p fnip %p return %d\n",
661 (void *)vfsp, (void *)rootvp, (void *)fnip, error));
662
663 return (0);
664
665 errout:
666 ASSERT(fnip != NULL);
667 ASSERT((uap->flags & MS_REMOUNT) == 0);
668
669 if (fnip->fi_addr.buf != NULL)
670 kmem_free(fnip->fi_addr.buf, fnip->fi_addr.len);
671 if (fnip->fi_path != NULL)
672 kmem_free(fnip->fi_path, fnip->fi_pathlen);
673 if (fnip->fi_opts != NULL)
674 kmem_free(fnip->fi_opts, fnip->fi_optslen);
675 if (fnip->fi_map != NULL)
676 kmem_free(fnip->fi_map, fnip->fi_maplen);
677 if (fnip->fi_subdir != NULL)
678 kmem_free(fnip->fi_subdir, fnip->fi_subdirlen);
679 if (fnip->fi_key != NULL)
680 kmem_free(fnip->fi_key, fnip->fi_keylen);
681 kmem_free(fnip, sizeof (*fnip));
682
683 AUTOFS_DPRINT((5, "auto_mount: vfs %p root %p fnip %p return %d\n",
684 (void *)vfsp, (void *)rootvp, (void *)fnip, error));
685
686 return (error);
687 }
688
689 /* ARGSUSED */
690 static int
691 auto_unmount(vfs_t *vfsp, int flag, cred_t *cr)
692 {
693 fninfo_t *fnip;
694 vnode_t *rvp;
695 fnnode_t *rfnp, *fnp, *pfnp;
696 fnnode_t *myrootfnnodep;
697
698 fnip = vfstofni(vfsp);
699 AUTOFS_DPRINT((4, "auto_unmount vfsp %p fnip %p\n", (void *)vfsp,
700 (void *)fnip));
701
702 if (secpolicy_fs_unmount(cr, vfsp) != 0)
703 return (EPERM);
704 /*
705 * forced unmount is not supported by this file system
706 * and thus, ENOTSUP, is being returned.
707 */
708 if (flag & MS_FORCE)
709 return (ENOTSUP);
710
711 ASSERT(vn_vfswlock_held(vfsp->vfs_vnodecovered));
712 rvp = fnip->fi_rootvp;
713 rfnp = vntofn(rvp);
714
715 if (rvp->v_count > 1 || rfnp->fn_dirents != NULL)
716 return (EBUSY);
717
718 /*
719 * The root vnode is on the linked list of root fnnodes only if
720 * this was not a trigger node. Since we have no way of knowing,
721 * if we don't find it, then we assume it was a trigger node.
722 */
723 myrootfnnodep = rfnp->fn_globals->fng_rootfnnodep;
724 pfnp = NULL;
725 rw_enter(&myrootfnnodep->fn_rwlock, RW_WRITER);
726 fnp = myrootfnnodep->fn_dirents;
727 while (fnp != NULL) {
728 if (fnp == rfnp) {
729 /*
730 * A check here is made to see if rvp is busy. If
731 * so, return EBUSY. Otherwise proceed with
732 * disconnecting it from the list.
733 */
734 if (rvp->v_count > 1 || rfnp->fn_dirents != NULL) {
735 rw_exit(&myrootfnnodep->fn_rwlock);
736 return (EBUSY);
737 }
738 if (pfnp)
739 pfnp->fn_next = fnp->fn_next;
740 else
741 myrootfnnodep->fn_dirents = fnp->fn_next;
742 fnp->fn_next = NULL;
743 break;
744 }
745 pfnp = fnp;
746 fnp = fnp->fn_next;
747 }
748 rw_exit(&myrootfnnodep->fn_rwlock);
749
750 ASSERT(rvp->v_count == 1);
751 ASSERT(rfnp->fn_size == 1);
752 ASSERT(rfnp->fn_linkcnt == 1);
753 /*
754 * The following drops linkcnt to 0, therefore the disconnect is
755 * not attempted when auto_inactive() is called by
756 * vn_rele(). This is necessary because we have nothing to get
757 * disconnected from since we're the root of the filesystem. As a
758 * side effect the node is not freed, therefore I should free the
759 * node here.
760 *
761 * XXX - I really need to think of a better way of doing this.
762 */
763 rfnp->fn_size--;
764 rfnp->fn_linkcnt--;
765
766 /*
767 * release of last reference causes node
768 * to be freed
769 */
770 VN_RELE(rvp);
771 rfnp->fn_parent = NULL;
772
773 auto_freefnnode(rfnp);
774
775 kmem_free(fnip->fi_addr.buf, fnip->fi_addr.len);
776 kmem_free(fnip->fi_path, fnip->fi_pathlen);
777 kmem_free(fnip->fi_map, fnip->fi_maplen);
778 kmem_free(fnip->fi_subdir, fnip->fi_subdirlen);
779 kmem_free(fnip->fi_key, fnip->fi_keylen);
780 kmem_free(fnip->fi_opts, fnip->fi_optslen);
781 kmem_free(fnip, sizeof (*fnip));
782 AUTOFS_DPRINT((5, "auto_unmount: return=0\n"));
783
784 return (0);
785 }
786
787
788 /*
789 * find root of autofs
790 */
791 static int
792 auto_root(vfs_t *vfsp, vnode_t **vpp)
793 {
794 *vpp = (vnode_t *)vfstofni(vfsp)->fi_rootvp;
795 VN_HOLD(*vpp);
796
797 AUTOFS_DPRINT((5, "auto_root: vfs %p, *vpp %p\n", (void *)vfsp,
798 (void *)*vpp));
799 return (0);
800 }
801
802 /*
803 * Get file system statistics.
804 */
805 static int
806 auto_statvfs(vfs_t *vfsp, struct statvfs64 *sbp)
807 {
808 dev32_t d32;
809
810 AUTOFS_DPRINT((4, "auto_statvfs %p\n", (void *)vfsp));
811
812 bzero(sbp, sizeof (*sbp));
813 sbp->f_bsize = vfsp->vfs_bsize;
814 sbp->f_frsize = sbp->f_bsize;
815 sbp->f_blocks = (fsblkcnt64_t)0;
816 sbp->f_bfree = (fsblkcnt64_t)0;
817 sbp->f_bavail = (fsblkcnt64_t)0;
818 sbp->f_files = (fsfilcnt64_t)0;
819 sbp->f_ffree = (fsfilcnt64_t)0;
820 sbp->f_favail = (fsfilcnt64_t)0;
821 (void) cmpldev(&d32, vfsp->vfs_dev);
822 sbp->f_fsid = d32;
823 (void) strcpy(sbp->f_basetype, vfssw[vfsp->vfs_fstype].vsw_name);
824 sbp->f_flag = vf_to_stf(vfsp->vfs_flag);
825 sbp->f_namemax = MAXNAMELEN;
826 (void) strcpy(sbp->f_fstr, MNTTYPE_AUTOFS);
827
828 return (0);
829 }