1 /* $OpenBSD: msdosfs_denode.c,v 1.68 2023/03/08 04:43:08 guenther Exp $ */
2 /* $NetBSD: msdosfs_denode.c,v 1.23 1997/10/17 11:23:58 ws Exp $ */
3
4 /*-
5 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
6 * Copyright (C) 1994, 1995, 1997 TooLs GmbH.
7 * All rights reserved.
8 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below).
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by TooLs GmbH.
21 * 4. The name of TooLs GmbH may not be used to endorse or promote products
22 * derived from this software without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
27 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
29 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
30 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
31 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
32 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
33 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35 /*
36 * Written by Paul Popelka (paulp@uts.amdahl.com)
37 *
38 * You can do anything you want with this software, just don't say you wrote
39 * it, and don't remove this notice.
40 *
41 * This software is provided "as is".
42 *
43 * The author supplies this software to be publicly redistributed on the
44 * understanding that the author is not responsible for the correct
45 * functioning of this software in any circumstances and is not liable for
46 * any damages caused by this software.
47 *
48 * October 1992
49 */
50
51 #include <sys/param.h>
52 #include <sys/systm.h>
53 #include <sys/mount.h>
54 #include <sys/malloc.h>
55 #include <sys/buf.h>
56 #include <sys/vnode.h>
57 #include <sys/lock.h>
58 #include <sys/kernel.h> /* defines "time" */
59 #include <sys/dirent.h>
60 #include <sys/namei.h>
61
62 #include <crypto/siphash.h>
63
64 #include <msdosfs/bpb.h>
65 #include <msdosfs/msdosfsmount.h>
66 #include <msdosfs/direntry.h>
67 #include <msdosfs/denode.h>
68 #include <msdosfs/fat.h>
69
70 u_int msdosfs_dehash(dev_t, uint32_t, uint32_t);
71
72 struct denode **dehashtbl;
73 SIPHASH_KEY dehashkey;
74 u_long dehash; /* size of hash table - 1 */
75 #define DEHASH(dev, dcl, doff) msdosfs_dehash((dev), (dcl), (doff))
76
77 static struct denode *msdosfs_hashget(dev_t, uint32_t, uint32_t);
78 static int msdosfs_hashins(struct denode *);
79 static void msdosfs_hashrem(struct denode *);
80
81 int
msdosfs_init(struct vfsconf * vfsp)82 msdosfs_init(struct vfsconf *vfsp)
83 {
84 dehashtbl = hashinit(initialvnodes / 2, M_MSDOSFSMNT, M_WAITOK, &dehash);
85 arc4random_buf(&dehashkey, sizeof(dehashkey));
86 return (0);
87 }
88
89 u_int
msdosfs_dehash(dev_t dev,uint32_t dirclust,uint32_t diroff)90 msdosfs_dehash(dev_t dev, uint32_t dirclust, uint32_t diroff)
91 {
92 SIPHASH_CTX ctx;
93
94 SipHash24_Init(&ctx, &dehashkey);
95 SipHash24_Update(&ctx, &dev, sizeof(dev));
96 SipHash24_Update(&ctx, &dirclust, sizeof(dirclust));
97 SipHash24_Update(&ctx, &diroff, sizeof(diroff));
98
99 return (SipHash24_End(&ctx) & dehash);
100 }
101
102 static struct denode *
msdosfs_hashget(dev_t dev,uint32_t dirclust,uint32_t diroff)103 msdosfs_hashget(dev_t dev, uint32_t dirclust, uint32_t diroff)
104 {
105 struct denode *dep;
106
107 for (;;)
108 for (dep = dehashtbl[DEHASH(dev, dirclust, diroff)]; ;
109 dep = dep->de_next) {
110 if (dep == NULL)
111 return (NULL);
112 if (dirclust == dep->de_dirclust &&
113 diroff == dep->de_diroffset &&
114 dev == dep->de_dev &&
115 dep->de_refcnt != 0) {
116 struct vnode *vp = DETOV(dep);
117
118 if (!vget(vp, LK_EXCLUSIVE))
119 return (dep);
120 break;
121 }
122 }
123 /* NOTREACHED */
124 }
125
126 static int
msdosfs_hashins(struct denode * dep)127 msdosfs_hashins(struct denode *dep)
128 {
129 struct denode **depp, *deq;
130
131 depp = &dehashtbl[DEHASH(dep->de_dev, dep->de_dirclust,
132 dep->de_diroffset)];
133
134 for (deq = *depp; deq; deq = deq->de_next) {
135 if (dep->de_dirclust == deq->de_dirclust &&
136 dep->de_diroffset == deq->de_diroffset &&
137 dep->de_dev == deq->de_dev &&
138 deq->de_refcnt != 0) {
139 return (EEXIST);
140 }
141 }
142
143 if ((deq = *depp) != NULL)
144 deq->de_prev = &dep->de_next;
145 dep->de_next = deq;
146 dep->de_prev = depp;
147 *depp = dep;
148 return (0);
149 }
150
151 static void
msdosfs_hashrem(struct denode * dep)152 msdosfs_hashrem(struct denode *dep)
153 {
154 struct denode *deq;
155
156 if (dep->de_prev == NULL)
157 return;
158
159 if ((deq = dep->de_next) != NULL)
160 deq->de_prev = dep->de_prev;
161 *dep->de_prev = deq;
162 #ifdef DIAGNOSTIC
163 dep->de_next = NULL;
164 dep->de_prev = NULL;
165 #endif
166 }
167
168 /*
169 * If deget() succeeds it returns with the gotten denode locked().
170 *
171 * pmp - address of msdosfsmount structure of the filesystem containing
172 * the denode of interest. The pm_dev field and the address of
173 * the msdosfsmount structure are used.
174 * dirclust - which cluster bp contains, if dirclust is 0 (root directory)
175 * diroffset is relative to the beginning of the root directory,
176 * otherwise it is cluster relative.
177 * diroffset - offset past begin of cluster of denode we want
178 * depp - returns the address of the gotten denode.
179 */
180 int
deget(struct msdosfsmount * pmp,uint32_t dirclust,uint32_t diroffset,struct denode ** depp)181 deget(struct msdosfsmount *pmp, uint32_t dirclust, uint32_t diroffset,
182 struct denode **depp)
183 {
184 int error;
185 extern const struct vops msdosfs_vops;
186 struct direntry *direntptr;
187 struct denode *ldep;
188 struct vnode *nvp;
189 struct buf *bp;
190
191 #ifdef MSDOSFS_DEBUG
192 printf("deget(pmp %p, dirclust %d, diroffset %x, depp %p)\n",
193 pmp, dirclust, diroffset, depp);
194 #endif
195
196 /*
197 * On FAT32 filesystems, root is a (more or less) normal
198 * directory
199 */
200 if (FAT32(pmp) && dirclust == MSDOSFSROOT)
201 dirclust = pmp->pm_rootdirblk;
202
203 /*
204 * See if the denode is in the denode cache. Use the location of
205 * the directory entry to compute the hash value. For subdir use
206 * address of "." entry. For root dir (if not FAT32) use cluster
207 * MSDOSFSROOT, offset MSDOSFSROOT_OFS
208 *
209 * NOTE: The check for de_refcnt > 0 below insures the denode being
210 * examined does not represent an unlinked but still open file.
211 * These files are not to be accessible even when the directory
212 * entry that represented the file happens to be reused while the
213 * deleted file is still open.
214 */
215 retry:
216 ldep = msdosfs_hashget(pmp->pm_dev, dirclust, diroffset);
217 if (ldep) {
218 *depp = ldep;
219 return (0);
220 }
221
222 /*
223 * Directory entry was not in cache, have to create a vnode and
224 * copy it from the passed disk buffer.
225 */
226 /* getnewvnode() does a vref() on the vnode */
227 error = getnewvnode(VT_MSDOSFS, pmp->pm_mountp, &msdosfs_vops, &nvp);
228 if (error) {
229 *depp = 0;
230 return (error);
231 }
232 ldep = malloc(sizeof(*ldep), M_MSDOSFSNODE, M_WAITOK | M_ZERO);
233 rrw_init_flags(&ldep->de_lock, "denode", RWL_DUPOK | RWL_IS_VNODE);
234 nvp->v_data = ldep;
235 ldep->de_vnode = nvp;
236 ldep->de_flag = 0;
237 ldep->de_devvp = 0;
238 ldep->de_lockf = 0;
239 ldep->de_dev = pmp->pm_dev;
240 ldep->de_dirclust = dirclust;
241 ldep->de_diroffset = diroffset;
242 fc_purge(ldep, 0); /* init the fat cache for this denode */
243
244 /*
245 * Insert the denode into the hash queue and lock the denode so it
246 * can't be accessed until we've read it in and have done what we
247 * need to it.
248 */
249 vn_lock(nvp, LK_EXCLUSIVE | LK_RETRY);
250 error = msdosfs_hashins(ldep);
251
252 if (error) {
253 vput (nvp);
254
255 if (error == EEXIST)
256 goto retry;
257
258 return (error);
259 }
260
261 ldep->de_pmp = pmp;
262 ldep->de_devvp = pmp->pm_devvp;
263 ldep->de_refcnt = 1;
264 /*
265 * Copy the directory entry into the denode area of the vnode.
266 */
267 if ((dirclust == MSDOSFSROOT
268 || (FAT32(pmp) && dirclust == pmp->pm_rootdirblk))
269 && diroffset == MSDOSFSROOT_OFS) {
270 /*
271 * Directory entry for the root directory. There isn't one,
272 * so we manufacture one. We should probably rummage
273 * through the root directory and find a label entry (if it
274 * exists), and then use the time and date from that entry
275 * as the time and date for the root denode.
276 */
277 nvp->v_flag |= VROOT; /* should be further down XXX */
278
279 ldep->de_Attributes = ATTR_DIRECTORY;
280 if (FAT32(pmp))
281 ldep->de_StartCluster = pmp->pm_rootdirblk;
282 /* de_FileSize will be filled in further down */
283 else {
284 ldep->de_StartCluster = MSDOSFSROOT;
285 ldep->de_FileSize = pmp->pm_rootdirsize * pmp->pm_BytesPerSec;
286 }
287 /*
288 * fill in time and date so that dos2unixtime() doesn't
289 * spit up when called from msdosfs_getattr() with root
290 * denode
291 */
292 ldep->de_CTime = 0x0000; /* 00:00:00 */
293 ldep->de_CTimeHundredth = 0;
294 ldep->de_CDate = (0 << DD_YEAR_SHIFT) | (1 << DD_MONTH_SHIFT)
295 | (1 << DD_DAY_SHIFT);
296 /* Jan 1, 1980 */
297 ldep->de_ADate = ldep->de_CDate;
298 ldep->de_MTime = ldep->de_CTime;
299 ldep->de_MDate = ldep->de_CDate;
300 /* leave the other fields as garbage */
301 } else {
302 error = readep(pmp, dirclust, diroffset, &bp, &direntptr);
303 if (error)
304 return (error);
305 DE_INTERNALIZE(ldep, direntptr);
306 brelse(bp);
307 }
308
309 /*
310 * Fill in a few fields of the vnode and finish filling in the
311 * denode. Then return the address of the found denode.
312 */
313 if (ldep->de_Attributes & ATTR_DIRECTORY) {
314 /*
315 * Since DOS directory entries that describe directories
316 * have 0 in the filesize field, we take this opportunity
317 * to find out the length of the directory and plug it into
318 * the denode structure.
319 */
320 uint32_t size;
321
322 nvp->v_type = VDIR;
323 if (ldep->de_StartCluster != MSDOSFSROOT) {
324 error = pcbmap(ldep, CLUST_END, 0, &size, 0);
325 if (error == E2BIG) {
326 ldep->de_FileSize = de_cn2off(pmp, size);
327 error = 0;
328 } else if (error) {
329 printf("deget(): pcbmap returned %d\n", error);
330 return (error);
331 }
332 }
333 } else
334 nvp->v_type = VREG;
335 vref(ldep->de_devvp);
336 *depp = ldep;
337 return (0);
338 }
339
340 int
deupdat(struct denode * dep,int waitfor)341 deupdat(struct denode *dep, int waitfor)
342 {
343 struct buf *bp;
344 struct direntry *dirp;
345 int error;
346 struct timespec ts;
347
348 if (DETOV(dep)->v_mount->mnt_flag & MNT_RDONLY)
349 return (0);
350 getnanotime(&ts);
351 DETIMES(dep, &ts, &ts, &ts);
352 if ((dep->de_flag & DE_MODIFIED) == 0)
353 return (0);
354 dep->de_flag &= ~DE_MODIFIED;
355 if (dep->de_Attributes & ATTR_DIRECTORY)
356 return (0);
357 if (dep->de_refcnt <= 0)
358 return (0);
359 error = readde(dep, &bp, &dirp);
360 if (error)
361 return (error);
362 DE_EXTERNALIZE(dirp, dep);
363 if (waitfor)
364 return (bwrite(bp));
365 else {
366 bdwrite(bp);
367 return (0);
368 }
369 }
370
371 /*
372 * Truncate the file described by dep to the length specified by length.
373 */
374 int
detrunc(struct denode * dep,uint32_t length,int flags,struct ucred * cred,struct proc * p)375 detrunc(struct denode *dep, uint32_t length, int flags, struct ucred *cred,
376 struct proc *p)
377 {
378 int error;
379 int allerror;
380 int vflags;
381 uint32_t eofentry;
382 uint32_t chaintofree = 0;
383 daddr_t bn;
384 int boff;
385 int isadir = dep->de_Attributes & ATTR_DIRECTORY;
386 struct buf *bp;
387 struct msdosfsmount *pmp = dep->de_pmp;
388
389 #ifdef MSDOSFS_DEBUG
390 printf("detrunc(): file %.11s, length %u, flags %d\n",
391 dep->de_Name, length, flags);
392 #endif
393
394 /*
395 * Disallow attempts to truncate the root directory since it is of
396 * fixed size. That's just the way dos filesystems are. We use
397 * the VROOT bit in the vnode because checking for the directory
398 * bit and a startcluster of 0 in the denode is not adequate to
399 * recognize the root directory at this point in a file or
400 * directory's life.
401 */
402 if ((DETOV(dep)->v_flag & VROOT) && !FAT32(pmp)) {
403 printf("detrunc(): can't truncate root directory, clust %u, offset %u\n",
404 dep->de_dirclust, dep->de_diroffset);
405 return (EINVAL);
406 }
407
408 uvm_vnp_setsize(DETOV(dep), length);
409
410 if (dep->de_FileSize < length)
411 return (deextend(dep, length, cred));
412
413 /*
414 * If the desired length is 0 then remember the starting cluster of
415 * the file and set the StartCluster field in the directory entry
416 * to 0. If the desired length is not zero, then get the number of
417 * the last cluster in the shortened file. Then get the number of
418 * the first cluster in the part of the file that is to be freed.
419 * Then set the next cluster pointer in the last cluster of the
420 * file to CLUST_EOFE.
421 */
422 if (length == 0) {
423 chaintofree = dep->de_StartCluster;
424 dep->de_StartCluster = 0;
425 eofentry = ~0;
426 } else {
427 error = pcbmap(dep, de_clcount(pmp, length) - 1, 0,
428 &eofentry, 0);
429 if (error) {
430 #ifdef MSDOSFS_DEBUG
431 printf("detrunc(): pcbmap fails %d\n", error);
432 #endif
433 return (error);
434 }
435 }
436
437 fc_purge(dep, de_clcount(pmp, length));
438
439 /*
440 * If the new length is not a multiple of the cluster size then we
441 * must zero the tail end of the new last cluster in case it
442 * becomes part of the file again because of a seek.
443 */
444 if ((boff = length & pmp->pm_crbomask) != 0) {
445 if (isadir) {
446 bn = cntobn(pmp, eofentry);
447 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, &bp);
448 } else {
449 bn = de_blk(pmp, length);
450 error = bread(DETOV(dep), bn, pmp->pm_bpcluster, &bp);
451 }
452 if (error) {
453 brelse(bp);
454 #ifdef MSDOSFS_DEBUG
455 printf("detrunc(): bread fails %d\n", error);
456 #endif
457 return (error);
458 }
459 uvm_vnp_uncache(DETOV(dep));
460 /*
461 * is this the right place for it?
462 */
463 bzero(bp->b_data + boff, pmp->pm_bpcluster - boff);
464 if (flags & IO_SYNC)
465 bwrite(bp);
466 else
467 bdwrite(bp);
468 }
469
470 /*
471 * Write out the updated directory entry. Even if the update fails
472 * we free the trailing clusters.
473 */
474 dep->de_FileSize = length;
475 if (!isadir)
476 dep->de_flag |= DE_UPDATE|DE_MODIFIED;
477 vflags = (length > 0 ? V_SAVE : 0) | V_SAVEMETA;
478 vinvalbuf(DETOV(dep), vflags, cred, p, 0, INFSLP);
479 allerror = deupdat(dep, 1);
480 #ifdef MSDOSFS_DEBUG
481 printf("detrunc(): allerror %d, eofentry %d\n",
482 allerror, eofentry);
483 #endif
484
485 /*
486 * If we need to break the cluster chain for the file then do it
487 * now.
488 */
489 if (eofentry != ~0) {
490 error = fatentry(FAT_GET_AND_SET, pmp, eofentry,
491 &chaintofree, CLUST_EOFE);
492 if (error) {
493 #ifdef MSDOSFS_DEBUG
494 printf("detrunc(): fatentry errors %d\n", error);
495 #endif
496 return (error);
497 }
498 fc_setcache(dep, FC_LASTFC, de_cluster(pmp, length - 1),
499 eofentry);
500 }
501
502 /*
503 * Now free the clusters removed from the file because of the
504 * truncation.
505 */
506 if (chaintofree != 0 && !MSDOSFSEOF(pmp, chaintofree))
507 freeclusterchain(pmp, chaintofree);
508
509 return (allerror);
510 }
511
512 /*
513 * Extend the file described by dep to length specified by length.
514 */
515 int
deextend(struct denode * dep,uint32_t length,struct ucred * cred)516 deextend(struct denode *dep, uint32_t length, struct ucred *cred)
517 {
518 struct msdosfsmount *pmp = dep->de_pmp;
519 uint32_t count;
520 int error;
521
522 /*
523 * The root of a DOS filesystem cannot be extended.
524 */
525 if ((DETOV(dep)->v_flag & VROOT) && !FAT32(pmp))
526 return (EINVAL);
527
528 /*
529 * Directories cannot be extended.
530 */
531 if (dep->de_Attributes & ATTR_DIRECTORY)
532 return (EISDIR);
533
534 if (length <= dep->de_FileSize)
535 panic("deextend: file too large");
536
537 /*
538 * Compute the number of clusters to allocate.
539 */
540 count = de_clcount(pmp, length) - de_clcount(pmp, dep->de_FileSize);
541 if (count > 0) {
542 if (count > pmp->pm_freeclustercount)
543 return (ENOSPC);
544 error = extendfile(dep, count, NULL, NULL, DE_CLEAR);
545 if (error) {
546 /* truncate the added clusters away again */
547 (void) detrunc(dep, dep->de_FileSize, 0, cred, curproc);
548 return (error);
549 }
550 }
551
552 dep->de_FileSize = length;
553 dep->de_flag |= DE_UPDATE|DE_MODIFIED;
554 return (deupdat(dep, 1));
555 }
556
557 /*
558 * Move a denode to its correct hash queue after the file it represents has
559 * been moved to a new directory.
560 */
561 void
reinsert(struct denode * dep)562 reinsert(struct denode *dep)
563 {
564 /*
565 * Fix up the denode cache. If the denode is for a directory,
566 * there is nothing to do since the hash is based on the starting
567 * cluster of the directory file and that hasn't changed. If for a
568 * file the hash is based on the location of the directory entry,
569 * so we must remove it from the cache and re-enter it with the
570 * hash based on the new location of the directory entry.
571 */
572 if (dep->de_Attributes & ATTR_DIRECTORY)
573 return;
574 msdosfs_hashrem(dep);
575 msdosfs_hashins(dep);
576 }
577
578 int
msdosfs_reclaim(void * v)579 msdosfs_reclaim(void *v)
580 {
581 struct vop_reclaim_args *ap = v;
582 struct vnode *vp = ap->a_vp;
583 struct denode *dep = VTODE(vp);
584 #ifdef DIAGNOSTIC
585 extern int prtactive;
586
587 if (prtactive && vp->v_usecount != 0)
588 vprint("msdosfs_reclaim(): pushing active", vp);
589 #endif
590
591 #ifdef MSDOSFS_DEBUG
592 printf("msdosfs_reclaim(): dep %p, file %.11s, refcnt %ld\n",
593 dep, dep->de_Name, dep->de_refcnt);
594 #endif
595
596 /*
597 * Remove the denode from its hash chain.
598 */
599 msdosfs_hashrem(dep);
600 /*
601 * Purge old data structures associated with the denode.
602 */
603 cache_purge(vp);
604 if (dep->de_devvp) {
605 vrele(dep->de_devvp);
606 dep->de_devvp = 0;
607 }
608 #if 0 /* XXX */
609 dep->de_flag = 0;
610 #endif
611 free(dep, M_MSDOSFSNODE, 0);
612 vp->v_data = NULL;
613 return (0);
614 }
615
616 int
msdosfs_inactive(void * v)617 msdosfs_inactive(void *v)
618 {
619 struct vop_inactive_args *ap = v;
620 struct vnode *vp = ap->a_vp;
621 struct denode *dep = VTODE(vp);
622 int error;
623 #ifdef DIAGNOSTIC
624 extern int prtactive;
625
626 if (prtactive && vp->v_usecount != 0)
627 vprint("msdosfs_inactive(): pushing active", vp);
628 #endif
629
630 #ifdef MSDOSFS_DEBUG
631 printf("msdosfs_inactive(): dep %p, de_Name[0] %x\n", dep,
632 dep->de_Name[0]);
633 #endif
634
635 error = 0;
636
637 /*
638 * Get rid of denodes related to stale file handles.
639 */
640 if (dep->de_Name[0] == SLOT_DELETED)
641 goto out;
642
643 /*
644 * If the file has been deleted and it is on a read/write
645 * filesystem, then truncate the file, and mark the directory slot
646 * as empty. (This may not be necessary for the dos filesystem.)
647 */
648 #ifdef MSDOSFS_DEBUG
649 printf("msdosfs_inactive(): dep %p, refcnt %ld, mntflag %x, "
650 "MNT_RDONLY %x\n", dep, dep->de_refcnt, vp->v_mount->mnt_flag,
651 MNT_RDONLY);
652 #endif
653 if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
654 error = detrunc(dep, (uint32_t)0, 0, NOCRED, ap->a_p);
655 dep->de_Name[0] = SLOT_DELETED;
656 }
657 deupdat(dep, 0);
658
659 out:
660 VOP_UNLOCK(vp);
661 /*
662 * If we are done with the denode, reclaim it
663 * so that it can be reused immediately.
664 */
665 #ifdef MSDOSFS_DEBUG
666 printf("msdosfs_inactive(): v_usecount %d, de_Name[0] %x\n",
667 vp->v_usecount, dep->de_Name[0]);
668 #endif
669 if (dep->de_Name[0] == SLOT_DELETED)
670 vrecycle(vp, ap->a_p);
671 return (error);
672 }
673