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) 1990, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright (c) 2011, Joyent, Inc. All rights reserved.
24 * Copyright 2016 RackTop Systems.
25 */
26
27 #include <sys/types.h>
28 #include <sys/param.h>
29 #include <sys/sysmacros.h>
30 #include <sys/kmem.h>
31 #include <sys/time.h>
32 #include <sys/pathname.h>
33 #include <sys/vfs.h>
34 #include <sys/vfs_opreg.h>
35 #include <sys/vnode.h>
36 #include <sys/stat.h>
37 #include <sys/uio.h>
38 #include <sys/stat.h>
39 #include <sys/errno.h>
40 #include <sys/cmn_err.h>
41 #include <sys/cred.h>
42 #include <sys/statvfs.h>
43 #include <sys/mount.h>
44 #include <sys/debug.h>
45 #include <sys/systm.h>
46 #include <sys/mntent.h>
47 #include <fs/fs_subr.h>
48 #include <vm/page.h>
49 #include <vm/anon.h>
50 #include <sys/model.h>
51 #include <sys/policy.h>
52
53 #include <sys/fs/swapnode.h>
54 #include <sys/fs/tmp.h>
55 #include <sys/fs/tmpnode.h>
56
57 static int tmpfsfstype;
58
59 /*
60 * tmpfs vfs operations.
61 */
62 static int tmpfsinit(int, char *);
63 static int tmp_mount(struct vfs *, struct vnode *,
64 struct mounta *, struct cred *);
65 static int tmp_unmount(struct vfs *, int, struct cred *);
66 static int tmp_root(struct vfs *, struct vnode **);
67 static int tmp_statvfs(struct vfs *, struct statvfs64 *);
68 static int tmp_vget(struct vfs *, struct vnode **, struct fid *);
69
70 /*
71 * Loadable module wrapper
72 */
73 #include <sys/modctl.h>
74
75 static mntopts_t tmpfs_proto_opttbl;
76
77 static vfsdef_t vfw = {
78 VFSDEF_VERSION,
79 "tmpfs",
80 tmpfsinit,
81 VSW_HASPROTO|VSW_CANREMOUNT|VSW_STATS|VSW_ZMOUNT,
82 &tmpfs_proto_opttbl
83 };
84
85 /*
86 * in-kernel mnttab options
87 */
88 static char *xattr_cancel[] = { MNTOPT_NOXATTR, NULL };
89 static char *noxattr_cancel[] = { MNTOPT_XATTR, NULL };
90
91 static mntopt_t tmpfs_options[] = {
92 /* Option name Cancel Opt Arg Flags Data */
93 { MNTOPT_XATTR, xattr_cancel, NULL, MO_DEFAULT, NULL},
94 { MNTOPT_NOXATTR, noxattr_cancel, NULL, NULL, NULL},
95 { "size", NULL, "0", MO_HASVALUE, NULL}
96 };
97
98
99 static mntopts_t tmpfs_proto_opttbl = {
100 sizeof (tmpfs_options) / sizeof (mntopt_t),
101 tmpfs_options
102 };
103
104 /*
105 * Module linkage information
106 */
107 static struct modlfs modlfs = {
108 &mod_fsops, "filesystem for tmpfs", &vfw
109 };
110
111 static struct modlinkage modlinkage = {
112 MODREV_1, &modlfs, NULL
113 };
114
115 int
116 _init()
117 {
118 return (mod_install(&modlinkage));
119 }
120
121 int
122 _fini()
123 {
124 int error;
125
126 error = mod_remove(&modlinkage);
127 if (error)
128 return (error);
129 /*
130 * Tear down the operations vectors
131 */
132 (void) vfs_freevfsops_by_type(tmpfsfstype);
133 vn_freevnodeops(tmp_vnodeops);
134 return (0);
135 }
136
137 int
138 _info(struct modinfo *modinfop)
139 {
140 return (mod_info(&modlinkage, modinfop));
141 }
142
143 /*
144 * The following are patchable variables limiting the amount of system
145 * resources tmpfs can use.
146 *
147 * tmpfs_maxkmem limits the amount of kernel kmem_alloc memory
148 * tmpfs can use for it's data structures (e.g. tmpnodes, directory entries)
149 * It is not determined by setting a hard limit but rather as a percentage of
150 * physical memory which is determined when tmpfs is first used in the system.
151 *
152 * tmpfs_minfree is the minimum amount of swap space that tmpfs leaves for
153 * the rest of the system. In other words, if the amount of free swap space
154 * in the system (i.e. anoninfo.ani_free) drops below tmpfs_minfree, tmpfs
155 * anon allocations will fail.
156 *
157 * There is also a per mount limit on the amount of swap space
158 * (tmount.tm_anonmax) settable via a mount option.
159 */
160 size_t tmpfs_maxkmem = 0;
161 size_t tmpfs_minfree = 0;
162 size_t tmp_kmemspace; /* bytes of kernel heap used by all tmpfs */
163
164 static major_t tmpfs_major;
165 static minor_t tmpfs_minor;
166 static kmutex_t tmpfs_minor_lock;
167
168 /*
169 * initialize global tmpfs locks and such
170 * called when loading tmpfs module
171 */
172 static int
173 tmpfsinit(int fstype, char *name)
174 {
175 static const fs_operation_def_t tmp_vfsops_template[] = {
176 VFSNAME_MOUNT, { .vfs_mount = tmp_mount },
177 VFSNAME_UNMOUNT, { .vfs_unmount = tmp_unmount },
178 VFSNAME_ROOT, { .vfs_root = tmp_root },
179 VFSNAME_STATVFS, { .vfs_statvfs = tmp_statvfs },
180 VFSNAME_VGET, { .vfs_vget = tmp_vget },
181 NULL, NULL
182 };
183 int error;
184 extern void tmpfs_hash_init();
185
186 tmpfs_hash_init();
187 tmpfsfstype = fstype;
188 ASSERT(tmpfsfstype != 0);
189
190 error = vfs_setfsops(fstype, tmp_vfsops_template, NULL);
191 if (error != 0) {
192 cmn_err(CE_WARN, "tmpfsinit: bad vfs ops template");
193 return (error);
194 }
195
196 error = vn_make_ops(name, tmp_vnodeops_template, &tmp_vnodeops);
197 if (error != 0) {
198 (void) vfs_freevfsops_by_type(fstype);
199 cmn_err(CE_WARN, "tmpfsinit: bad vnode ops template");
200 return (error);
201 }
202
203 /*
204 * tmpfs_minfree doesn't need to be some function of configured
205 * swap space since it really is an absolute limit of swap space
206 * which still allows other processes to execute.
207 */
208 if (tmpfs_minfree == 0) {
209 /*
210 * Set if not patched
211 */
212 tmpfs_minfree = btopr(TMPMINFREE);
213 }
214
215 /*
216 * The maximum amount of space tmpfs can allocate is
217 * TMPMAXPROCKMEM percent of kernel memory
218 */
219 if (tmpfs_maxkmem == 0)
220 tmpfs_maxkmem = MAX(PAGESIZE, kmem_maxavail() / TMPMAXFRACKMEM);
221
222 if ((tmpfs_major = getudev()) == (major_t)-1) {
223 cmn_err(CE_WARN, "tmpfsinit: Can't get unique device number.");
224 tmpfs_major = 0;
225 }
226 mutex_init(&tmpfs_minor_lock, NULL, MUTEX_DEFAULT, NULL);
227 return (0);
228 }
229
230 static int
231 tmp_mount(
232 struct vfs *vfsp,
233 struct vnode *mvp,
234 struct mounta *uap,
235 struct cred *cr)
236 {
237 struct tmount *tm = NULL;
238 struct tmpnode *tp;
239 struct pathname dpn;
240 int error;
241 pgcnt_t anonmax;
242 struct vattr rattr;
243 int got_attrs;
244
245 char *sizestr;
246
247 if ((error = secpolicy_fs_mount(cr, mvp, vfsp)) != 0)
248 return (error);
249
250 if (mvp->v_type != VDIR)
251 return (ENOTDIR);
252
253 mutex_enter(&mvp->v_lock);
254 if ((uap->flags & MS_REMOUNT) == 0 && (uap->flags & MS_OVERLAY) == 0 &&
255 (mvp->v_count != 1 || (mvp->v_flag & VROOT))) {
256 mutex_exit(&mvp->v_lock);
257 return (EBUSY);
258 }
259 mutex_exit(&mvp->v_lock);
260
261 /*
262 * Having the resource be anything but "swap" doesn't make sense.
263 */
264 vfs_setresource(vfsp, "swap", 0);
265
266 /*
267 * now look for options we understand...
268 */
269
270 /* tmpfs doesn't support read-only mounts */
271 if (vfs_optionisset(vfsp, MNTOPT_RO, NULL)) {
272 error = EINVAL;
273 goto out;
274 }
275
276 /*
277 * tm_anonmax is set according to the mount arguments
278 * if any. Otherwise, it is set to a maximum value.
279 */
280 if (vfs_optionisset(vfsp, "size", &sizestr)) {
281 if ((error = tmp_convnum(sizestr, &anonmax)) != 0)
282 goto out;
283 } else {
284 anonmax = ULONG_MAX;
285 }
286
287 if (error = pn_get(uap->dir,
288 (uap->flags & MS_SYSSPACE) ? UIO_SYSSPACE : UIO_USERSPACE, &dpn))
289 goto out;
290
291 if (uap->flags & MS_REMOUNT) {
292 tm = (struct tmount *)VFSTOTM(vfsp);
293
294 /*
295 * If we change the size so its less than what is currently
296 * being used, we allow that. The file system will simply be
297 * full until enough files have been removed to get below the
298 * new max.
299 */
300 mutex_enter(&tm->tm_contents);
301 tm->tm_anonmax = anonmax;
302 mutex_exit(&tm->tm_contents);
303 goto out;
304 }
305
306 if ((tm = tmp_memalloc(sizeof (struct tmount), 0)) == NULL) {
307 pn_free(&dpn);
308 error = ENOMEM;
309 goto out;
310 }
311
312 /*
313 * find an available minor device number for this mount
314 */
315 mutex_enter(&tmpfs_minor_lock);
316 do {
317 tmpfs_minor = (tmpfs_minor + 1) & L_MAXMIN32;
318 tm->tm_dev = makedevice(tmpfs_major, tmpfs_minor);
319 } while (vfs_devismounted(tm->tm_dev));
320 mutex_exit(&tmpfs_minor_lock);
321
322 /*
323 * Set but don't bother entering the mutex
324 * (tmount not on mount list yet)
325 */
326 mutex_init(&tm->tm_contents, NULL, MUTEX_DEFAULT, NULL);
327 mutex_init(&tm->tm_renamelck, NULL, MUTEX_DEFAULT, NULL);
328
329 tm->tm_vfsp = vfsp;
330 tm->tm_anonmax = anonmax;
331
332 vfsp->vfs_data = (caddr_t)tm;
333 vfsp->vfs_fstype = tmpfsfstype;
334 vfsp->vfs_dev = tm->tm_dev;
335 vfsp->vfs_bsize = PAGESIZE;
336 vfsp->vfs_flag |= VFS_NOTRUNC;
337 vfs_make_fsid(&vfsp->vfs_fsid, tm->tm_dev, tmpfsfstype);
338 tm->tm_mntpath = tmp_memalloc(dpn.pn_pathlen + 1, TMP_MUSTHAVE);
339 (void) strcpy(tm->tm_mntpath, dpn.pn_path);
340
341 /*
342 * allocate and initialize root tmpnode structure
343 */
344 bzero(&rattr, sizeof (struct vattr));
345 rattr.va_mode = (mode_t)(S_IFDIR | 0777); /* XXX modes */
346 rattr.va_type = VDIR;
347 rattr.va_rdev = 0;
348 tp = tmp_memalloc(sizeof (struct tmpnode), TMP_MUSTHAVE);
349 tmpnode_init(tm, tp, &rattr, cr);
350
351 /*
352 * Get the mode, uid, and gid from the underlying mount point.
353 */
354 rattr.va_mask = AT_MODE|AT_UID|AT_GID; /* Hint to getattr */
355 got_attrs = VOP_GETATTR(mvp, &rattr, 0, cr, NULL);
356
357 rw_enter(&tp->tn_rwlock, RW_WRITER);
358 TNTOV(tp)->v_flag |= VROOT;
359
360 /*
361 * If the getattr succeeded, use its results. Otherwise allow
362 * the previously set hardwired defaults to prevail.
363 */
364 if (got_attrs == 0) {
365 tp->tn_mode = rattr.va_mode;
366 tp->tn_uid = rattr.va_uid;
367 tp->tn_gid = rattr.va_gid;
368 }
369
370 /*
371 * initialize linked list of tmpnodes so that the back pointer of
372 * the root tmpnode always points to the last one on the list
373 * and the forward pointer of the last node is null
374 */
375 tp->tn_back = tp;
376 tp->tn_forw = NULL;
377 tp->tn_nlink = 0;
378 tm->tm_rootnode = tp;
379
380 tdirinit(tp, tp);
381
382 rw_exit(&tp->tn_rwlock);
383
384 pn_free(&dpn);
385 error = 0;
386
387 out:
388 if (error == 0)
389 vfs_set_feature(vfsp, VFSFT_SYSATTR_VIEWS);
390
391 return (error);
392 }
393
394 static int
395 tmp_unmount(struct vfs *vfsp, int flag, struct cred *cr)
396 {
397 struct tmount *tm = (struct tmount *)VFSTOTM(vfsp);
398 struct tmpnode *tnp, *cancel;
399 struct vnode *vp;
400 int error;
401
402 if ((error = secpolicy_fs_unmount(cr, vfsp)) != 0)
403 return (error);
404
405 /*
406 * forced unmount is not supported by this file system
407 * and thus, ENOTSUP, is being returned.
408 */
409 if (flag & MS_FORCE)
410 return (ENOTSUP);
411
412 mutex_enter(&tm->tm_contents);
413
414 /*
415 * If there are no open files, only the root node should have
416 * a reference count.
417 * With tm_contents held, nothing can be added or removed.
418 * There may be some dirty pages. To prevent fsflush from
419 * disrupting the unmount, put a hold on each node while scanning.
420 * If we find a previously referenced node, undo the holds we have
421 * placed and fail EBUSY.
422 */
423 tnp = tm->tm_rootnode;
424 if (TNTOV(tnp)->v_count > 1) {
425 mutex_exit(&tm->tm_contents);
426 return (EBUSY);
427 }
428
429 for (tnp = tnp->tn_forw; tnp; tnp = tnp->tn_forw) {
430 if ((vp = TNTOV(tnp))->v_count > 0) {
431 cancel = tm->tm_rootnode->tn_forw;
432 while (cancel != tnp) {
433 vp = TNTOV(cancel);
434 ASSERT(vp->v_count > 0);
435 VN_RELE(vp);
436 cancel = cancel->tn_forw;
437 }
438 mutex_exit(&tm->tm_contents);
439 return (EBUSY);
440 }
441 VN_HOLD(vp);
442 }
443
444 /*
445 * We can drop the mutex now because no one can find this mount
446 */
447 mutex_exit(&tm->tm_contents);
448
449 /*
450 * Free all kmemalloc'd and anonalloc'd memory associated with
451 * this filesystem. To do this, we go through the file list twice,
452 * once to remove all the directory entries, and then to remove
453 * all the files. We do this because there is useful code in
454 * tmpnode_free which assumes that the directory entry has been
455 * removed before the file.
456 */
457 /*
458 * Remove all directory entries
459 */
460 for (tnp = tm->tm_rootnode; tnp; tnp = tnp->tn_forw) {
461 rw_enter(&tnp->tn_rwlock, RW_WRITER);
462 if (tnp->tn_type == VDIR)
463 tdirtrunc(tnp);
464 if (tnp->tn_vnode->v_flag & V_XATTRDIR) {
465 /*
466 * Account for implicit attrdir reference.
467 */
468 ASSERT(tnp->tn_nlink > 0);
469 DECR_COUNT(&tnp->tn_nlink, &tnp->tn_tlock);
470 }
471 rw_exit(&tnp->tn_rwlock);
472 }
473
474 ASSERT(tm->tm_rootnode);
475
476 /*
477 * All links are gone, v_count is keeping nodes in place.
478 * VN_RELE should make the node disappear, unless somebody
479 * is holding pages against it. Nap and retry until it disappears.
480 *
481 * We re-acquire the lock to prevent others who have a HOLD on
482 * a tmpnode via its pages or anon slots from blowing it away
483 * (in tmp_inactive) while we're trying to get to it here. Once
484 * we have a HOLD on it we know it'll stick around.
485 *
486 */
487 mutex_enter(&tm->tm_contents);
488 /*
489 * Remove all the files (except the rootnode) backwards.
490 */
491 while ((tnp = tm->tm_rootnode->tn_back) != tm->tm_rootnode) {
492 mutex_exit(&tm->tm_contents);
493 /*
494 * Inhibit tmp_inactive from touching attribute directory
495 * as all nodes will be released here.
496 * Note we handled the link count in pass 2 above.
497 */
498 rw_enter(&tnp->tn_rwlock, RW_WRITER);
499 tnp->tn_xattrdp = NULL;
500 rw_exit(&tnp->tn_rwlock);
501 vp = TNTOV(tnp);
502 VN_RELE(vp);
503 mutex_enter(&tm->tm_contents);
504 /*
505 * It's still there after the RELE. Someone else like pageout
506 * has a hold on it so wait a bit and then try again - we know
507 * they'll give it up soon.
508 */
509 if (tnp == tm->tm_rootnode->tn_back) {
510 VN_HOLD(vp);
511 mutex_exit(&tm->tm_contents);
512 delay(hz / 4);
513 mutex_enter(&tm->tm_contents);
514 }
515 }
516 mutex_exit(&tm->tm_contents);
517
518 tm->tm_rootnode->tn_xattrdp = NULL;
519 VN_RELE(TNTOV(tm->tm_rootnode));
520
521 ASSERT(tm->tm_mntpath);
522
523 tmp_memfree(tm->tm_mntpath, strlen(tm->tm_mntpath) + 1);
524
525 ASSERT(tm->tm_anonmem == 0);
526
527 mutex_destroy(&tm->tm_contents);
528 mutex_destroy(&tm->tm_renamelck);
529 tmp_memfree(tm, sizeof (struct tmount));
530
531 return (0);
532 }
533
534 /*
535 * return root tmpnode for given vnode
536 */
537 static int
538 tmp_root(struct vfs *vfsp, struct vnode **vpp)
539 {
540 struct tmount *tm = (struct tmount *)VFSTOTM(vfsp);
541 struct tmpnode *tp = tm->tm_rootnode;
542 struct vnode *vp;
543
544 ASSERT(tp);
545
546 vp = TNTOV(tp);
547 VN_HOLD(vp);
548 *vpp = vp;
549 return (0);
550 }
551
552 static int
553 tmp_statvfs(struct vfs *vfsp, struct statvfs64 *sbp)
554 {
555 struct tmount *tm = (struct tmount *)VFSTOTM(vfsp);
556 ulong_t blocks;
557 dev32_t d32;
558 zoneid_t eff_zid;
559 struct zone *zp;
560
561 /*
562 * The file system may have been mounted by the global zone on
563 * behalf of the non-global zone. In that case, the tmount zone_id
564 * will be the global zone. We still want to show the swap cap inside
565 * the zone in this case, even though the file system was mounted by
566 * the global zone.
567 */
568 if (curproc->p_zone->zone_id != GLOBAL_ZONEUNIQID)
569 zp = curproc->p_zone;
570 else
571 zp = tm->tm_vfsp->vfs_zone;
572
573 if (zp == NULL)
574 eff_zid = GLOBAL_ZONEUNIQID;
575 else
576 eff_zid = zp->zone_id;
577
578 sbp->f_bsize = PAGESIZE;
579 sbp->f_frsize = PAGESIZE;
580
581 /*
582 * Find the amount of available physical and memory swap
583 */
584 mutex_enter(&anoninfo_lock);
585 ASSERT(k_anoninfo.ani_max >= k_anoninfo.ani_phys_resv);
586 blocks = (ulong_t)CURRENT_TOTAL_AVAILABLE_SWAP;
587 mutex_exit(&anoninfo_lock);
588
589 /*
590 * Compare the amount of space that should be free to this mount
591 * (which may be limited by tm_anonmax) with the amount of space
592 * that's actually free to all tmpfs and use the lowest value.
593 */
594 if (blocks > tmpfs_minfree && tm->tm_anonmax > tm->tm_anonmem)
595 sbp->f_bfree = MIN(blocks - tmpfs_minfree,
596 tm->tm_anonmax - tm->tm_anonmem);
597 else
598 sbp->f_bfree = 0;
599
600 sbp->f_bavail = sbp->f_bfree;
601
602 /*
603 * Total number of blocks is what's available plus what's been used
604 */
605 sbp->f_blocks = (fsblkcnt64_t)(sbp->f_bfree + tm->tm_anonmem);
606
607 if (eff_zid != GLOBAL_ZONEUNIQID &&
608 zp->zone_max_swap_ctl != UINT64_MAX) {
609 /*
610 * If the fs is used by a non-global zone with a swap cap,
611 * then report the capped size.
612 */
613 rctl_qty_t cap, used;
614 pgcnt_t pgcap, pgused;
615
616 mutex_enter(&zp->zone_mem_lock);
617 cap = zp->zone_max_swap_ctl;
618 used = zp->zone_max_swap;
619 mutex_exit(&zp->zone_mem_lock);
620
621 pgcap = btop(cap);
622 pgused = btop(used);
623
624 sbp->f_bfree = MIN(pgcap - pgused, sbp->f_bfree);
625 sbp->f_bavail = sbp->f_bfree;
626 sbp->f_blocks = MIN(pgcap, sbp->f_blocks);
627 }
628
629 /*
630 * The maximum number of files available is approximately the number
631 * of tmpnodes we can allocate from the number of blocks available
632 * to this mount. This is fairly inaccurate since it doesn't take
633 * into account the names stored in the directory entries.
634 */
635 sbp->f_ffree = sbp->f_bfree == 0 ? 0 : ptob(sbp->f_bfree) /
636 (sizeof (struct tmpnode) + sizeof (struct tdirent));
637 sbp->f_files = sbp->f_blocks == 0 ? 0 : ptob(sbp->f_blocks) /
638 (sizeof (struct tmpnode) + sizeof (struct tdirent));
639 sbp->f_favail = (fsfilcnt64_t)(sbp->f_ffree);
640 (void) cmpldev(&d32, vfsp->vfs_dev);
641 sbp->f_fsid = d32;
642 (void) strcpy(sbp->f_basetype, vfssw[tmpfsfstype].vsw_name);
643 (void) strncpy(sbp->f_fstr, tm->tm_mntpath, sizeof (sbp->f_fstr));
644 /*
645 * ensure null termination
646 */
647 sbp->f_fstr[sizeof (sbp->f_fstr) - 1] = '\0';
648 sbp->f_flag = vf_to_stf(vfsp->vfs_flag);
649 sbp->f_namemax = MAXNAMELEN - 1;
650 return (0);
651 }
652
653 static int
654 tmp_vget(struct vfs *vfsp, struct vnode **vpp, struct fid *fidp)
655 {
656 struct tfid *tfid;
657 struct tmount *tm = (struct tmount *)VFSTOTM(vfsp);
658 struct tmpnode *tp = NULL;
659
660 tfid = (struct tfid *)fidp;
661 *vpp = NULL;
662
663 mutex_enter(&tm->tm_contents);
664 for (tp = tm->tm_rootnode; tp; tp = tp->tn_forw) {
665 mutex_enter(&tp->tn_tlock);
666 if (tp->tn_nodeid == tfid->tfid_ino) {
667 /*
668 * If the gen numbers don't match we know the
669 * file won't be found since only one tmpnode
670 * can have this number at a time.
671 */
672 if (tp->tn_gen != tfid->tfid_gen || tp->tn_nlink == 0) {
673 mutex_exit(&tp->tn_tlock);
674 mutex_exit(&tm->tm_contents);
675 return (0);
676 }
677 *vpp = (struct vnode *)TNTOV(tp);
678
679 VN_HOLD(*vpp);
680
681 if ((tp->tn_mode & S_ISVTX) &&
682 !(tp->tn_mode & (S_IXUSR | S_IFDIR))) {
683 mutex_enter(&(*vpp)->v_lock);
684 (*vpp)->v_flag |= VISSWAP;
685 mutex_exit(&(*vpp)->v_lock);
686 }
687 mutex_exit(&tp->tn_tlock);
688 mutex_exit(&tm->tm_contents);
689 return (0);
690 }
691 mutex_exit(&tp->tn_tlock);
692 }
693 mutex_exit(&tm->tm_contents);
694 return (0);
695 }