1 /*
2 * Copyright (c) 2000-2001, Boris Popov
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by Boris Popov.
16 * 4. Neither the name of the author nor the names of any co-contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * $Id: smbfs_vfsops.c,v 1.73.64.1 2005/05/27 02:35:28 lindak Exp $
33 */
34
35 /*
36 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
37 */
38
39 #include <sys/systm.h>
40 #include <sys/cred.h>
41 #include <sys/time.h>
42 #include <sys/vfs.h>
43 #include <sys/vnode.h>
44 #include <fs/fs_subr.h>
45 #include <sys/sysmacros.h>
46 #include <sys/kmem.h>
47 #include <sys/mkdev.h>
48 #include <sys/mount.h>
49 #include <sys/statvfs.h>
50 #include <sys/errno.h>
51 #include <sys/debug.h>
52 #include <sys/cmn_err.h>
53 #include <sys/modctl.h>
54 #include <sys/policy.h>
55 #include <sys/atomic.h>
56 #include <sys/zone.h>
57 #include <sys/vfs_opreg.h>
58 #include <sys/mntent.h>
59 #include <sys/priv.h>
60 #include <sys/tsol/label.h>
61 #include <sys/tsol/tndb.h>
62 #include <inet/ip.h>
63
64 #include <netsmb/smb_osdep.h>
65 #include <netsmb/smb.h>
66 #include <netsmb/smb_conn.h>
67 #include <netsmb/smb_subr.h>
68 #include <netsmb/smb_dev.h>
69
70 #include <smbfs/smbfs.h>
71 #include <smbfs/smbfs_node.h>
72 #include <smbfs/smbfs_subr.h>
73
74 /*
75 * Local functions definitions.
76 */
77 int smbfsinit(int fstyp, char *name);
78 void smbfsfini();
79 static int smbfs_mount_label_policy(vfs_t *, void *, int, cred_t *);
80
81 /*
82 * SMBFS Mount options table for MS_OPTIONSTR
83 * Note: These are not all the options.
84 * Some options come in via MS_DATA.
85 * Others are generic (see vfs.c)
86 */
87 static char *intr_cancel[] = { MNTOPT_NOINTR, NULL };
88 static char *nointr_cancel[] = { MNTOPT_INTR, NULL };
89 static char *acl_cancel[] = { MNTOPT_NOACL, NULL };
90 static char *noacl_cancel[] = { MNTOPT_ACL, NULL };
91 static char *xattr_cancel[] = { MNTOPT_NOXATTR, NULL };
92 static char *noxattr_cancel[] = { MNTOPT_XATTR, NULL };
93
94 static mntopt_t mntopts[] = {
95 /*
96 * option name cancel option default arg flags
97 * ufs arg flag
98 */
99 { MNTOPT_INTR, intr_cancel, NULL, MO_DEFAULT, 0 },
100 { MNTOPT_NOINTR, nointr_cancel, NULL, 0, 0 },
101 { MNTOPT_ACL, acl_cancel, NULL, MO_DEFAULT, 0 },
102 { MNTOPT_NOACL, noacl_cancel, NULL, 0, 0 },
103 { MNTOPT_XATTR, xattr_cancel, NULL, MO_DEFAULT, 0 },
104 { MNTOPT_NOXATTR, noxattr_cancel, NULL, 0, 0 }
105 };
106
107 static mntopts_t smbfs_mntopts = {
108 sizeof (mntopts) / sizeof (mntopt_t),
109 mntopts
110 };
111
112 static const char fs_type_name[FSTYPSZ] = "smbfs";
113
114 static vfsdef_t vfw = {
115 VFSDEF_VERSION,
116 (char *)fs_type_name,
117 smbfsinit, /* init routine */
118 VSW_HASPROTO|VSW_NOTZONESAFE|VSW_ZMOUNT, /* flags */
119 &smbfs_mntopts /* mount options table prototype */
120 };
121
122 static struct modlfs modlfs = {
123 &mod_fsops,
124 "SMBFS filesystem",
125 &vfw
126 };
127
128 static struct modlinkage modlinkage = {
129 MODREV_1, (void *)&modlfs, NULL
130 };
131
132 /*
133 * Mutex to protect the following variables:
134 * smbfs_major
135 * smbfs_minor
136 */
137 extern kmutex_t smbfs_minor_lock;
138 extern int smbfs_major;
139 extern int smbfs_minor;
140
141 /*
142 * Prevent unloads while we have mounts
143 */
144 uint32_t smbfs_mountcount;
145
146 /*
147 * smbfs vfs operations.
148 */
149 static int smbfs_mount(vfs_t *, vnode_t *, struct mounta *, cred_t *);
150 static int smbfs_unmount(vfs_t *, int, cred_t *);
151 static int smbfs_root(vfs_t *, vnode_t **);
152 static int smbfs_statvfs(vfs_t *, statvfs64_t *);
153 static int smbfs_sync(vfs_t *, short, cred_t *);
154 static void smbfs_freevfs(vfs_t *);
155
156 /*
157 * Module loading
158 */
159
160 /*
161 * This routine is invoked automatically when the kernel module
162 * containing this routine is loaded. This allows module specific
163 * initialization to be done when the module is loaded.
164 */
165 int
166 _init(void)
167 {
168 int error;
169
170 /*
171 * Check compiled-in version of "nsmb"
172 * that we're linked with. (paranoid)
173 */
174 if (nsmb_version != NSMB_VERSION) {
175 cmn_err(CE_WARN, "_init: nsmb version mismatch");
176 return (ENOTTY);
177 }
178
179 smbfs_mountcount = 0;
180
181 /*
182 * NFS calls these two in _clntinit
183 * Easier to follow this way.
184 */
185 if ((error = smbfs_subrinit()) != 0) {
186 cmn_err(CE_WARN, "_init: smbfs_subrinit failed");
187 return (error);
188 }
189
190 if ((error = smbfs_vfsinit()) != 0) {
191 cmn_err(CE_WARN, "_init: smbfs_vfsinit failed");
192 smbfs_subrfini();
193 return (error);
194 }
195
196 if ((error = smbfs_clntinit()) != 0) {
197 cmn_err(CE_WARN, "_init: smbfs_clntinit failed");
198 smbfs_vfsfini();
199 smbfs_subrfini();
200 return (error);
201 }
202
203 error = mod_install((struct modlinkage *)&modlinkage);
204 return (error);
205 }
206
207 /*
208 * Free kernel module resources that were allocated in _init
209 * and remove the linkage information into the kernel
210 */
211 int
212 _fini(void)
213 {
214 int error;
215
216 /*
217 * If a forcedly unmounted instance is still hanging around,
218 * we cannot allow the module to be unloaded because that would
219 * cause panics once the VFS framework decides it's time to call
220 * into VFS_FREEVFS().
221 */
222 if (smbfs_mountcount)
223 return (EBUSY);
224
225 error = mod_remove(&modlinkage);
226 if (error)
227 return (error);
228
229 /*
230 * Free the allocated smbnodes, etc.
231 */
232 smbfs_clntfini();
233
234 /* NFS calls these two in _clntfini */
235 smbfs_vfsfini();
236 smbfs_subrfini();
237
238 /*
239 * Free the ops vectors
240 */
241 smbfsfini();
242 return (0);
243 }
244
245 /*
246 * Return information about the module
247 */
248 int
249 _info(struct modinfo *modinfop)
250 {
251 return (mod_info((struct modlinkage *)&modlinkage, modinfop));
252 }
253
254 /*
255 * Initialize the vfs structure
256 */
257
258 int smbfsfstyp;
259 vfsops_t *smbfs_vfsops = NULL;
260
261 static const fs_operation_def_t smbfs_vfsops_template[] = {
262 { VFSNAME_MOUNT, { .vfs_mount = smbfs_mount } },
263 { VFSNAME_UNMOUNT, { .vfs_unmount = smbfs_unmount } },
264 { VFSNAME_ROOT, { .vfs_root = smbfs_root } },
265 { VFSNAME_STATVFS, { .vfs_statvfs = smbfs_statvfs } },
266 { VFSNAME_SYNC, { .vfs_sync = smbfs_sync } },
267 { VFSNAME_VGET, { .error = fs_nosys } },
268 { VFSNAME_MOUNTROOT, { .error = fs_nosys } },
269 { VFSNAME_FREEVFS, { .vfs_freevfs = smbfs_freevfs } },
270 { NULL, NULL }
271 };
272
273 int
274 smbfsinit(int fstyp, char *name)
275 {
276 int error;
277
278 error = vfs_setfsops(fstyp, smbfs_vfsops_template, &smbfs_vfsops);
279 if (error != 0) {
280 zcmn_err(GLOBAL_ZONEID, CE_WARN,
281 "smbfsinit: bad vfs ops template");
282 return (error);
283 }
284
285 error = vn_make_ops(name, smbfs_vnodeops_template, &smbfs_vnodeops);
286 if (error != 0) {
287 (void) vfs_freevfsops_by_type(fstyp);
288 zcmn_err(GLOBAL_ZONEID, CE_WARN,
289 "smbfsinit: bad vnode ops template");
290 return (error);
291 }
292
293 smbfsfstyp = fstyp;
294
295 return (0);
296 }
297
298 void
299 smbfsfini()
300 {
301 if (smbfs_vfsops) {
302 (void) vfs_freevfsops_by_type(smbfsfstyp);
303 smbfs_vfsops = NULL;
304 }
305 if (smbfs_vnodeops) {
306 vn_freevnodeops(smbfs_vnodeops);
307 smbfs_vnodeops = NULL;
308 }
309 }
310
311 void
312 smbfs_free_smi(smbmntinfo_t *smi)
313 {
314 if (smi == NULL)
315 return;
316
317 if (smi->smi_zone_ref.zref_zone != NULL)
318 zone_rele_ref(&smi->smi_zone_ref, ZONE_REF_SMBFS);
319
320 if (smi->smi_share != NULL)
321 smb_share_rele(smi->smi_share);
322
323 avl_destroy(&smi->smi_hash_avl);
324 rw_destroy(&smi->smi_hash_lk);
325 cv_destroy(&smi->smi_statvfs_cv);
326 mutex_destroy(&smi->smi_lock);
327
328 kmem_free(smi, sizeof (smbmntinfo_t));
329 }
330
331 /*
332 * smbfs mount vfsop
333 * Set up mount info record and attach it to vfs struct.
334 */
335 static int
336 smbfs_mount(vfs_t *vfsp, vnode_t *mvp, struct mounta *uap, cred_t *cr)
337 {
338 char *data = uap->dataptr;
339 int error;
340 smbnode_t *rtnp = NULL; /* root of this fs */
341 smbmntinfo_t *smi = NULL;
342 dev_t smbfs_dev;
343 int version;
344 int devfd;
345 zone_t *zone = curproc->p_zone;
346 zone_t *mntzone = NULL;
347 smb_share_t *ssp = NULL;
348 smb_cred_t scred;
349 int flags, sec;
350
351 STRUCT_DECL(smbfs_args, args); /* smbfs mount arguments */
352
353 if ((error = secpolicy_fs_mount(cr, mvp, vfsp)) != 0)
354 return (error);
355
356 if (mvp->v_type != VDIR)
357 return (ENOTDIR);
358
359 /*
360 * get arguments
361 *
362 * uap->datalen might be different from sizeof (args)
363 * in a compatible situation.
364 */
365 STRUCT_INIT(args, get_udatamodel());
366 bzero(STRUCT_BUF(args), SIZEOF_STRUCT(smbfs_args, DATAMODEL_NATIVE));
367 if (copyin(data, STRUCT_BUF(args), MIN(uap->datalen,
368 SIZEOF_STRUCT(smbfs_args, DATAMODEL_NATIVE))))
369 return (EFAULT);
370
371 /*
372 * Check mount program version
373 */
374 version = STRUCT_FGET(args, version);
375 if (version != SMBFS_VERSION) {
376 cmn_err(CE_WARN, "mount version mismatch:"
377 " kernel=%d, mount=%d\n",
378 SMBFS_VERSION, version);
379 return (EINVAL);
380 }
381
382 /*
383 * Deal with re-mount requests.
384 */
385 if (uap->flags & MS_REMOUNT) {
386 cmn_err(CE_WARN, "MS_REMOUNT not implemented");
387 return (ENOTSUP);
388 }
389
390 /*
391 * Check for busy
392 */
393 mutex_enter(&mvp->v_lock);
394 if (!(uap->flags & MS_OVERLAY) &&
395 (mvp->v_count != 1 || (mvp->v_flag & VROOT))) {
396 mutex_exit(&mvp->v_lock);
397 return (EBUSY);
398 }
399 mutex_exit(&mvp->v_lock);
400
401 /*
402 * Get the "share" from the netsmb driver (ssp).
403 * It is returned with a "ref" (hold) for us.
404 * Release this hold: at errout below, or in
405 * smbfs_freevfs().
406 */
407 devfd = STRUCT_FGET(args, devfd);
408 error = smb_dev2share(devfd, &ssp);
409 if (error) {
410 cmn_err(CE_WARN, "invalid device handle %d (%d)\n",
411 devfd, error);
412 return (error);
413 }
414
415 /*
416 * Use "goto errout" from here on.
417 * See: ssp, smi, rtnp, mntzone
418 */
419
420 /*
421 * Determine the zone we're being mounted into.
422 */
423 zone_hold(mntzone = zone); /* start with this assumption */
424 if (getzoneid() == GLOBAL_ZONEID) {
425 zone_rele(mntzone);
426 mntzone = zone_find_by_path(refstr_value(vfsp->vfs_mntpt));
427 ASSERT(mntzone != NULL);
428 if (mntzone != zone) {
429 error = EBUSY;
430 goto errout;
431 }
432 }
433
434 /*
435 * Stop the mount from going any further if the zone is going away.
436 */
437 if (zone_status_get(mntzone) >= ZONE_IS_SHUTTING_DOWN) {
438 error = EBUSY;
439 goto errout;
440 }
441
442 /*
443 * On a Trusted Extensions client, we may have to force read-only
444 * for read-down mounts.
445 */
446 if (is_system_labeled()) {
447 void *addr;
448 int ipvers = 0;
449 struct smb_vc *vcp;
450
451 vcp = SSTOVC(ssp);
452 addr = smb_vc_getipaddr(vcp, &ipvers);
453 error = smbfs_mount_label_policy(vfsp, addr, ipvers, cr);
454
455 if (error > 0)
456 goto errout;
457
458 if (error == -1) {
459 /* change mount to read-only to prevent write-down */
460 vfs_setmntopt(vfsp, MNTOPT_RO, NULL, 0);
461 }
462 }
463
464 /* Prevent unload. */
465 atomic_inc_32(&smbfs_mountcount);
466
467 /*
468 * Create a mount record and link it to the vfs struct.
469 * No more possiblities for errors from here on.
470 * Tear-down of this stuff is in smbfs_free_smi()
471 *
472 * Compare with NFS: nfsrootvp()
473 */
474 smi = kmem_zalloc(sizeof (*smi), KM_SLEEP);
475
476 mutex_init(&smi->smi_lock, NULL, MUTEX_DEFAULT, NULL);
477 cv_init(&smi->smi_statvfs_cv, NULL, CV_DEFAULT, NULL);
478
479 rw_init(&smi->smi_hash_lk, NULL, RW_DEFAULT, NULL);
480 smbfs_init_hash_avl(&smi->smi_hash_avl);
481
482 smi->smi_share = ssp;
483 ssp = NULL;
484
485 /*
486 * Convert the anonymous zone hold acquired via zone_hold() above
487 * into a zone reference.
488 */
489 zone_init_ref(&smi->smi_zone_ref);
490 zone_hold_ref(mntzone, &smi->smi_zone_ref, ZONE_REF_SMBFS);
491 zone_rele(mntzone);
492 mntzone = NULL;
493
494 /*
495 * Initialize option defaults
496 */
497 smi->smi_flags = SMI_LLOCK;
498 smi->smi_acregmin = SEC2HR(SMBFS_ACREGMIN);
499 smi->smi_acregmax = SEC2HR(SMBFS_ACREGMAX);
500 smi->smi_acdirmin = SEC2HR(SMBFS_ACDIRMIN);
501 smi->smi_acdirmax = SEC2HR(SMBFS_ACDIRMAX);
502
503 /*
504 * All "generic" mount options have already been
505 * handled in vfs.c:domount() - see mntopts stuff.
506 * Query generic options using vfs_optionisset().
507 */
508 if (vfs_optionisset(vfsp, MNTOPT_INTR, NULL))
509 smi->smi_flags |= SMI_INT;
510 if (vfs_optionisset(vfsp, MNTOPT_ACL, NULL))
511 smi->smi_flags |= SMI_ACL;
512
513 /*
514 * Get the mount options that come in as smbfs_args,
515 * starting with args.flags (SMBFS_MF_xxx)
516 */
517 flags = STRUCT_FGET(args, flags);
518 smi->smi_uid = STRUCT_FGET(args, uid);
519 smi->smi_gid = STRUCT_FGET(args, gid);
520 smi->smi_fmode = STRUCT_FGET(args, file_mode) & 0777;
521 smi->smi_dmode = STRUCT_FGET(args, dir_mode) & 0777;
522
523 /*
524 * Hande the SMBFS_MF_xxx flags.
525 */
526 if (flags & SMBFS_MF_NOAC)
527 smi->smi_flags |= SMI_NOAC;
528 if (flags & SMBFS_MF_ACREGMIN) {
529 sec = STRUCT_FGET(args, acregmin);
530 if (sec < 0 || sec > SMBFS_ACMINMAX)
531 sec = SMBFS_ACMINMAX;
532 smi->smi_acregmin = SEC2HR(sec);
533 }
534 if (flags & SMBFS_MF_ACREGMAX) {
535 sec = STRUCT_FGET(args, acregmax);
536 if (sec < 0 || sec > SMBFS_ACMAXMAX)
537 sec = SMBFS_ACMAXMAX;
538 smi->smi_acregmax = SEC2HR(sec);
539 }
540 if (flags & SMBFS_MF_ACDIRMIN) {
541 sec = STRUCT_FGET(args, acdirmin);
542 if (sec < 0 || sec > SMBFS_ACMINMAX)
543 sec = SMBFS_ACMINMAX;
544 smi->smi_acdirmin = SEC2HR(sec);
545 }
546 if (flags & SMBFS_MF_ACDIRMAX) {
547 sec = STRUCT_FGET(args, acdirmax);
548 if (sec < 0 || sec > SMBFS_ACMAXMAX)
549 sec = SMBFS_ACMAXMAX;
550 smi->smi_acdirmax = SEC2HR(sec);
551 }
552
553 /*
554 * Get attributes of the remote file system,
555 * i.e. ACL support, named streams, etc.
556 */
557 smb_credinit(&scred, cr);
558 error = smbfs_smb_qfsattr(smi->smi_share, &smi->smi_fsa, &scred);
559 smb_credrele(&scred);
560 if (error) {
561 SMBVDEBUG("smbfs_smb_qfsattr error %d\n", error);
562 }
563
564 /*
565 * We enable XATTR by default (via smbfs_mntopts)
566 * but if the share does not support named streams,
567 * force the NOXATTR option (also clears XATTR).
568 * Caller will set or clear VFS_XATTR after this.
569 */
570 if ((smi->smi_fsattr & FILE_NAMED_STREAMS) == 0)
571 vfs_setmntopt(vfsp, MNTOPT_NOXATTR, NULL, 0);
572
573 /*
574 * Ditto ACLs (disable if not supported on this share)
575 */
576 if ((smi->smi_fsattr & FILE_PERSISTENT_ACLS) == 0) {
577 vfs_setmntopt(vfsp, MNTOPT_NOACL, NULL, 0);
578 smi->smi_flags &= ~SMI_ACL;
579 }
580
581 /*
582 * Assign a unique device id to the mount
583 */
584 mutex_enter(&smbfs_minor_lock);
585 do {
586 smbfs_minor = (smbfs_minor + 1) & MAXMIN32;
587 smbfs_dev = makedevice(smbfs_major, smbfs_minor);
588 } while (vfs_devismounted(smbfs_dev));
589 mutex_exit(&smbfs_minor_lock);
590
591 vfsp->vfs_dev = smbfs_dev;
592 vfs_make_fsid(&vfsp->vfs_fsid, smbfs_dev, smbfsfstyp);
593 vfsp->vfs_data = (caddr_t)smi;
594 vfsp->vfs_fstype = smbfsfstyp;
595 vfsp->vfs_bsize = MAXBSIZE;
596 vfsp->vfs_bcount = 0;
597
598 smi->smi_vfsp = vfsp;
599 smbfs_zonelist_add(smi); /* undo in smbfs_freevfs */
600
601 /*
602 * Create the root vnode, which we need in unmount
603 * for the call to smbfs_check_table(), etc.
604 * Release this hold in smbfs_unmount.
605 */
606 rtnp = smbfs_node_findcreate(smi, "\\", 1, NULL, 0, 0,
607 &smbfs_fattr0);
608 ASSERT(rtnp != NULL);
609 rtnp->r_vnode->v_type = VDIR;
610 rtnp->r_vnode->v_flag |= VROOT;
611 smi->smi_root = rtnp;
612
613 /*
614 * NFS does other stuff here too:
615 * async worker threads
616 * init kstats
617 *
618 * End of code from NFS nfsrootvp()
619 */
620 return (0);
621
622 errout:
623 vfsp->vfs_data = NULL;
624 if (smi != NULL)
625 smbfs_free_smi(smi);
626
627 if (mntzone != NULL)
628 zone_rele(mntzone);
629
630 if (ssp != NULL)
631 smb_share_rele(ssp);
632
633 return (error);
634 }
635
636 /*
637 * vfs operations
638 */
639 static int
640 smbfs_unmount(vfs_t *vfsp, int flag, cred_t *cr)
641 {
642 smbmntinfo_t *smi;
643 smbnode_t *rtnp;
644
645 smi = VFTOSMI(vfsp);
646
647 if (secpolicy_fs_unmount(cr, vfsp) != 0)
648 return (EPERM);
649
650 if ((flag & MS_FORCE) == 0) {
651 smbfs_rflush(vfsp, cr);
652
653 /*
654 * If there are any active vnodes on this file system,
655 * (other than the root vnode) then the file system is
656 * busy and can't be umounted.
657 */
658 if (smbfs_check_table(vfsp, smi->smi_root))
659 return (EBUSY);
660
661 /*
662 * We normally hold a ref to the root vnode, so
663 * check for references beyond the one we expect:
664 * smbmntinfo_t -> smi_root
665 * Note that NFS does not hold the root vnode.
666 */
667 if (smi->smi_root &&
668 smi->smi_root->r_vnode->v_count > 1)
669 return (EBUSY);
670 }
671
672 /*
673 * common code for both forced and non-forced
674 *
675 * Setting VFS_UNMOUNTED prevents new operations.
676 * Operations already underway may continue,
677 * but not for long.
678 */
679 vfsp->vfs_flag |= VFS_UNMOUNTED;
680
681 /*
682 * Shutdown any outstanding I/O requests on this share,
683 * and force a tree disconnect. The share object will
684 * continue to hang around until smb_share_rele().
685 * This should also cause most active nodes to be
686 * released as their operations fail with EIO.
687 */
688 smb_share_kill(smi->smi_share);
689
690 /*
691 * If we hold the root VP (and we normally do)
692 * then it's safe to release it now.
693 */
694 if (smi->smi_root) {
695 rtnp = smi->smi_root;
696 smi->smi_root = NULL;
697 VN_RELE(rtnp->r_vnode); /* release root vnode */
698 }
699
700 /*
701 * Remove all nodes from the node hash tables.
702 * This (indirectly) calls: smbfs_addfree, smbinactive,
703 * which will try to flush dirty pages, etc. so
704 * don't destroy the underlying share just yet.
705 *
706 * Also, with a forced unmount, some nodes may
707 * remain active, and those will get cleaned up
708 * after their last vn_rele.
709 */
710 smbfs_destroy_table(vfsp);
711
712 /*
713 * Delete our kstats...
714 *
715 * Doing it here, rather than waiting until
716 * smbfs_freevfs so these are not visible
717 * after the unmount.
718 */
719 if (smi->smi_io_kstats) {
720 kstat_delete(smi->smi_io_kstats);
721 smi->smi_io_kstats = NULL;
722 }
723 if (smi->smi_ro_kstats) {
724 kstat_delete(smi->smi_ro_kstats);
725 smi->smi_ro_kstats = NULL;
726 }
727
728 /*
729 * The rest happens in smbfs_freevfs()
730 */
731 return (0);
732 }
733
734
735 /*
736 * find root of smbfs
737 */
738 static int
739 smbfs_root(vfs_t *vfsp, vnode_t **vpp)
740 {
741 smbmntinfo_t *smi;
742 vnode_t *vp;
743
744 smi = VFTOSMI(vfsp);
745
746 if (curproc->p_zone != smi->smi_zone_ref.zref_zone)
747 return (EPERM);
748
749 if (smi->smi_flags & SMI_DEAD || vfsp->vfs_flag & VFS_UNMOUNTED)
750 return (EIO);
751
752 /*
753 * The root vp is created in mount and held
754 * until unmount, so this is paranoia.
755 */
756 if (smi->smi_root == NULL)
757 return (EIO);
758
759 /* Just take a reference and return it. */
760 vp = SMBTOV(smi->smi_root);
761 VN_HOLD(vp);
762 *vpp = vp;
763
764 return (0);
765 }
766
767 /*
768 * Get file system statistics.
769 */
770 static int
771 smbfs_statvfs(vfs_t *vfsp, statvfs64_t *sbp)
772 {
773 int error;
774 smbmntinfo_t *smi = VFTOSMI(vfsp);
775 smb_share_t *ssp = smi->smi_share;
776 statvfs64_t stvfs;
777 hrtime_t now;
778 smb_cred_t scred;
779
780 if (curproc->p_zone != smi->smi_zone_ref.zref_zone)
781 return (EPERM);
782
783 if (smi->smi_flags & SMI_DEAD || vfsp->vfs_flag & VFS_UNMOUNTED)
784 return (EIO);
785
786 mutex_enter(&smi->smi_lock);
787
788 /*
789 * Use cached result if still valid.
790 */
791 recheck:
792 now = gethrtime();
793 if (now < smi->smi_statfstime) {
794 error = 0;
795 goto cache_hit;
796 }
797
798 /*
799 * FS attributes are stale, so someone
800 * needs to do an OTW call to get them.
801 * Serialize here so only one thread
802 * does the OTW call.
803 */
804 if (smi->smi_status & SM_STATUS_STATFS_BUSY) {
805 smi->smi_status |= SM_STATUS_STATFS_WANT;
806 if (!cv_wait_sig(&smi->smi_statvfs_cv, &smi->smi_lock)) {
807 mutex_exit(&smi->smi_lock);
808 return (EINTR);
809 }
810 /* Hope status is valid now. */
811 goto recheck;
812 }
813 smi->smi_status |= SM_STATUS_STATFS_BUSY;
814 mutex_exit(&smi->smi_lock);
815
816 /*
817 * Do the OTW call. Note: lock NOT held.
818 */
819 smb_credinit(&scred, NULL);
820 bzero(&stvfs, sizeof (stvfs));
821 error = smbfs_smb_statfs(ssp, &stvfs, &scred);
822 smb_credrele(&scred);
823 if (error) {
824 SMBVDEBUG("statfs error=%d\n", error);
825 } else {
826
827 /*
828 * Set a few things the OTW call didn't get.
829 */
830 stvfs.f_frsize = stvfs.f_bsize;
831 stvfs.f_favail = stvfs.f_ffree;
832 stvfs.f_fsid = (unsigned long)vfsp->vfs_fsid.val[0];
833 bcopy(fs_type_name, stvfs.f_basetype, FSTYPSZ);
834 stvfs.f_flag = vf_to_stf(vfsp->vfs_flag);
835 stvfs.f_namemax = smi->smi_fsa.fsa_maxname;
836
837 /*
838 * Save the result, update lifetime
839 */
840 now = gethrtime();
841 smi->smi_statfstime = now +
842 (SM_MAX_STATFSTIME * (hrtime_t)NANOSEC);
843 smi->smi_statvfsbuf = stvfs; /* struct assign! */
844 }
845
846 mutex_enter(&smi->smi_lock);
847 if (smi->smi_status & SM_STATUS_STATFS_WANT)
848 cv_broadcast(&smi->smi_statvfs_cv);
849 smi->smi_status &= ~(SM_STATUS_STATFS_BUSY | SM_STATUS_STATFS_WANT);
850
851 /*
852 * Copy the statvfs data to caller's buf.
853 * Note: struct assignment
854 */
855 cache_hit:
856 if (error == 0)
857 *sbp = smi->smi_statvfsbuf;
858 mutex_exit(&smi->smi_lock);
859 return (error);
860 }
861
862 static kmutex_t smbfs_syncbusy;
863
864 /*
865 * Flush dirty smbfs files for file system vfsp.
866 * If vfsp == NULL, all smbfs files are flushed.
867 */
868 /*ARGSUSED*/
869 static int
870 smbfs_sync(vfs_t *vfsp, short flag, cred_t *cr)
871 {
872 /*
873 * Cross-zone calls are OK here, since this translates to a
874 * VOP_PUTPAGE(B_ASYNC), which gets picked up by the right zone.
875 */
876 if (!(flag & SYNC_ATTR) && mutex_tryenter(&smbfs_syncbusy) != 0) {
877 smbfs_rflush(vfsp, cr);
878 mutex_exit(&smbfs_syncbusy);
879 }
880
881 return (0);
882 }
883
884 /*
885 * Initialization routine for VFS routines. Should only be called once
886 */
887 int
888 smbfs_vfsinit(void)
889 {
890 mutex_init(&smbfs_syncbusy, NULL, MUTEX_DEFAULT, NULL);
891 return (0);
892 }
893
894 /*
895 * Shutdown routine for VFS routines. Should only be called once
896 */
897 void
898 smbfs_vfsfini(void)
899 {
900 mutex_destroy(&smbfs_syncbusy);
901 }
902
903 void
904 smbfs_freevfs(vfs_t *vfsp)
905 {
906 smbmntinfo_t *smi;
907
908 /* free up the resources */
909 smi = VFTOSMI(vfsp);
910
911 /*
912 * By this time we should have already deleted the
913 * smi kstats in the unmount code. If they are still around
914 * something is wrong
915 */
916 ASSERT(smi->smi_io_kstats == NULL);
917
918 smbfs_zonelist_remove(smi);
919
920 smbfs_free_smi(smi);
921
922 /*
923 * Allow _fini() to succeed now, if so desired.
924 */
925 atomic_dec_32(&smbfs_mountcount);
926 }
927
928 /*
929 * smbfs_mount_label_policy:
930 * Determine whether the mount is allowed according to MAC check,
931 * by comparing (where appropriate) label of the remote server
932 * against the label of the zone being mounted into.
933 *
934 * Returns:
935 * 0 : access allowed
936 * -1 : read-only access allowed (i.e., read-down)
937 * >0 : error code, such as EACCES
938 *
939 * NB:
940 * NFS supports Cipso labels by parsing the vfs_resource
941 * to see what the Solaris server global zone has shared.
942 * We can't support that for CIFS since resource names
943 * contain share names, not paths.
944 */
945 static int
946 smbfs_mount_label_policy(vfs_t *vfsp, void *ipaddr, int addr_type, cred_t *cr)
947 {
948 bslabel_t *server_sl, *mntlabel;
949 zone_t *mntzone = NULL;
950 ts_label_t *zlabel;
951 tsol_tpc_t *tp;
952 ts_label_t *tsl = NULL;
953 int retv;
954
955 /*
956 * Get the zone's label. Each zone on a labeled system has a label.
957 */
958 mntzone = zone_find_by_any_path(refstr_value(vfsp->vfs_mntpt), B_FALSE);
959 zlabel = mntzone->zone_slabel;
960 ASSERT(zlabel != NULL);
961 label_hold(zlabel);
962
963 retv = EACCES; /* assume the worst */
964
965 /*
966 * Next, get the assigned label of the remote server.
967 */
968 tp = find_tpc(ipaddr, addr_type, B_FALSE);
969 if (tp == NULL)
970 goto out; /* error getting host entry */
971
972 if (tp->tpc_tp.tp_doi != zlabel->tsl_doi)
973 goto rel_tpc; /* invalid domain */
974 if ((tp->tpc_tp.host_type != UNLABELED))
975 goto rel_tpc; /* invalid hosttype */
976
977 server_sl = &tp->tpc_tp.tp_def_label;
978 mntlabel = label2bslabel(zlabel);
979
980 /*
981 * Now compare labels to complete the MAC check. If the labels
982 * are equal or if the requestor is in the global zone and has
983 * NET_MAC_AWARE, then allow read-write access. (Except for
984 * mounts into the global zone itself; restrict these to
985 * read-only.)
986 *
987 * If the requestor is in some other zone, but his label
988 * dominates the server, then allow read-down.
989 *
990 * Otherwise, access is denied.
991 */
992 if (blequal(mntlabel, server_sl) ||
993 (crgetzoneid(cr) == GLOBAL_ZONEID &&
994 getpflags(NET_MAC_AWARE, cr) != 0)) {
995 if ((mntzone == global_zone) ||
996 !blequal(mntlabel, server_sl))
997 retv = -1; /* read-only */
998 else
999 retv = 0; /* access OK */
1000 } else if (bldominates(mntlabel, server_sl)) {
1001 retv = -1; /* read-only */
1002 } else {
1003 retv = EACCES;
1004 }
1005
1006 if (tsl != NULL)
1007 label_rele(tsl);
1008
1009 rel_tpc:
1010 /*LINTED*/
1011 TPC_RELE(tp);
1012 out:
1013 if (mntzone)
1014 zone_rele(mntzone);
1015 label_rele(zlabel);
1016 return (retv);
1017 }