xref: /freebsd/sys/fs/msdosfs/msdosfs_denode.c (revision c1d255d3ffdbe447de3ab875bf4e7d7accc5bfc5)
1 /* $FreeBSD$ */
2 /*	$NetBSD: msdosfs_denode.c,v 1.28 1998/02/10 14:10:00 mrg Exp $	*/
3 
4 /*-
5  * SPDX-License-Identifier: BSD-4-Clause
6  *
7  * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
8  * Copyright (C) 1994, 1995, 1997 TooLs GmbH.
9  * All rights reserved.
10  * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below).
11  *
12  * Redistribution and use in source and binary forms, with or without
13  * modification, are permitted provided that the following conditions
14  * are met:
15  * 1. Redistributions of source code must retain the above copyright
16  *    notice, this list of conditions and the following disclaimer.
17  * 2. Redistributions in binary form must reproduce the above copyright
18  *    notice, this list of conditions and the following disclaimer in the
19  *    documentation and/or other materials provided with the distribution.
20  * 3. All advertising materials mentioning features or use of this software
21  *    must display the following acknowledgement:
22  *	This product includes software developed by TooLs GmbH.
23  * 4. The name of TooLs GmbH may not be used to endorse or promote products
24  *    derived from this software without specific prior written permission.
25  *
26  * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
27  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
28  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
29  * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
30  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
31  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
32  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
33  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
34  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
35  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36  */
37 /*-
38  * Written by Paul Popelka (paulp@uts.amdahl.com)
39  *
40  * You can do anything you want with this software, just don't say you wrote
41  * it, and don't remove this notice.
42  *
43  * This software is provided "as is".
44  *
45  * The author supplies this software to be publicly redistributed on the
46  * understanding that the author is not responsible for the correct
47  * functioning of this software in any circumstances and is not liable for
48  * any damages caused by this software.
49  *
50  * October 1992
51  */
52 
53 #include <sys/param.h>
54 #include <sys/systm.h>
55 #include <sys/buf.h>
56 #include <sys/clock.h>
57 #include <sys/kernel.h>
58 #include <sys/malloc.h>
59 #include <sys/mount.h>
60 #include <sys/vmmeter.h>
61 #include <sys/vnode.h>
62 
63 #include <vm/vm.h>
64 #include <vm/vm_extern.h>
65 
66 #include <fs/msdosfs/bpb.h>
67 #include <fs/msdosfs/direntry.h>
68 #include <fs/msdosfs/denode.h>
69 #include <fs/msdosfs/fat.h>
70 #include <fs/msdosfs/msdosfsmount.h>
71 
72 static MALLOC_DEFINE(M_MSDOSFSNODE, "msdosfs_node", "MSDOSFS vnode private part");
73 
74 static int
75 de_vncmpf(struct vnode *vp, void *arg)
76 {
77 	struct denode *de;
78 	uint64_t *a;
79 
80 	a = arg;
81 	de = VTODE(vp);
82 	return (de->de_inode != *a) || (de->de_refcnt <= 0);
83 }
84 
85 /*
86  * If deget() succeeds it returns with the gotten denode locked().
87  *
88  * pmp	     - address of msdosfsmount structure of the filesystem containing
89  *	       the denode of interest.  The address of
90  *	       the msdosfsmount structure are used.
91  * dirclust  - which cluster bp contains, if dirclust is 0 (root directory)
92  *	       diroffset is relative to the beginning of the root directory,
93  *	       otherwise it is cluster relative.
94  * diroffset - offset past begin of cluster of denode we want
95  * lkflags   - locking flags (LK_NOWAIT)
96  * depp	     - returns the address of the gotten denode.
97  */
98 int
99 deget(struct msdosfsmount *pmp, u_long dirclust, u_long diroffset,
100     int lkflags, struct denode **depp)
101 {
102 	int error;
103 	uint64_t inode;
104 	struct mount *mntp = pmp->pm_mountp;
105 	struct direntry *direntptr;
106 	struct denode *ldep;
107 	struct vnode *nvp, *xvp;
108 	struct buf *bp;
109 
110 #ifdef MSDOSFS_DEBUG
111 	printf("deget(pmp %p, dirclust %lu, diroffset %lx, flags %#x, "
112 	    "depp %p)\n",
113 	    pmp, dirclust, diroffset, flags, depp);
114 #endif
115 	MPASS((lkflags & LK_TYPE_MASK) == LK_EXCLUSIVE);
116 
117 	/*
118 	 * On FAT32 filesystems, root is a (more or less) normal
119 	 * directory
120 	 */
121 	if (FAT32(pmp) && dirclust == MSDOSFSROOT)
122 		dirclust = pmp->pm_rootdirblk;
123 
124 	/*
125 	 * See if the denode is in the denode cache. Use the location of
126 	 * the directory entry to compute the hash value. For subdir use
127 	 * address of "." entry. For root dir (if not FAT32) use cluster
128 	 * MSDOSFSROOT, offset MSDOSFSROOT_OFS
129 	 *
130 	 * NOTE: de_vncmpf will explicitly skip any denodes that do not have
131 	 * a de_refcnt > 0.  This insures that that we do not attempt to use
132 	 * a denode that represents an unlinked but still open file.
133 	 * These files are not to be accessible even when the directory
134 	 * entry that represented the file happens to be reused while the
135 	 * deleted file is still open.
136 	 */
137 	inode = (uint64_t)pmp->pm_bpcluster * dirclust + diroffset;
138 
139 	error = vfs_hash_get(mntp, inode, lkflags, curthread, &nvp,
140 	    de_vncmpf, &inode);
141 	if (error)
142 		return (error);
143 	if (nvp != NULL) {
144 		*depp = VTODE(nvp);
145 		KASSERT((*depp)->de_dirclust == dirclust, ("wrong dirclust"));
146 		KASSERT((*depp)->de_diroffset == diroffset, ("wrong diroffset"));
147 		return (0);
148 	}
149 	ldep = malloc(sizeof(struct denode), M_MSDOSFSNODE, M_WAITOK | M_ZERO);
150 
151 	/*
152 	 * Directory entry was not in cache, have to create a vnode and
153 	 * copy it from the passed disk buffer.
154 	 */
155 	/* getnewvnode() does a VREF() on the vnode */
156 	error = getnewvnode("msdosfs", mntp, &msdosfs_vnodeops, &nvp);
157 	if (error) {
158 		*depp = NULL;
159 		free(ldep, M_MSDOSFSNODE);
160 		return error;
161 	}
162 	nvp->v_data = ldep;
163 	ldep->de_vnode = nvp;
164 	ldep->de_flag = 0;
165 	ldep->de_dirclust = dirclust;
166 	ldep->de_diroffset = diroffset;
167 	ldep->de_inode = inode;
168 	cluster_init_vn(&ldep->de_clusterw);
169 	lockmgr(nvp->v_vnlock, LK_EXCLUSIVE, NULL);
170 	VN_LOCK_AREC(nvp);	/* for doscheckpath */
171 	fc_purge(ldep, 0);	/* init the FAT cache for this denode */
172 	error = insmntque(nvp, mntp);
173 	if (error != 0) {
174 		free(ldep, M_MSDOSFSNODE);
175 		*depp = NULL;
176 		return (error);
177 	}
178 	error = vfs_hash_insert(nvp, inode, lkflags, curthread, &xvp,
179 	    de_vncmpf, &inode);
180 	if (error) {
181 		*depp = NULL;
182 		return (error);
183 	}
184 	if (xvp != NULL) {
185 		*depp = xvp->v_data;
186 		return (0);
187 	}
188 
189 	ldep->de_pmp = pmp;
190 	ldep->de_refcnt = 1;
191 	/*
192 	 * Copy the directory entry into the denode area of the vnode.
193 	 */
194 	if ((dirclust == MSDOSFSROOT
195 	     || (FAT32(pmp) && dirclust == pmp->pm_rootdirblk))
196 	    && diroffset == MSDOSFSROOT_OFS) {
197 		/*
198 		 * Directory entry for the root directory. There isn't one,
199 		 * so we manufacture one. We should probably rummage
200 		 * through the root directory and find a label entry (if it
201 		 * exists), and then use the time and date from that entry
202 		 * as the time and date for the root denode.
203 		 */
204 		nvp->v_vflag |= VV_ROOT; /* should be further down XXX */
205 
206 		ldep->de_Attributes = ATTR_DIRECTORY;
207 		ldep->de_LowerCase = 0;
208 		if (FAT32(pmp))
209 			ldep->de_StartCluster = pmp->pm_rootdirblk;
210 			/* de_FileSize will be filled in further down */
211 		else {
212 			ldep->de_StartCluster = MSDOSFSROOT;
213 			ldep->de_FileSize = pmp->pm_rootdirsize * DEV_BSIZE;
214 		}
215 		/*
216 		 * fill in time and date so that fattime2timespec() doesn't
217 		 * spit up when called from msdosfs_getattr() with root
218 		 * denode
219 		 */
220 		ldep->de_CHun = 0;
221 		ldep->de_CTime = 0x0000;	/* 00:00:00	 */
222 		ldep->de_CDate = (0 << DD_YEAR_SHIFT) | (1 << DD_MONTH_SHIFT)
223 		    | (1 << DD_DAY_SHIFT);
224 		/* Jan 1, 1980	 */
225 		ldep->de_ADate = ldep->de_CDate;
226 		ldep->de_MTime = ldep->de_CTime;
227 		ldep->de_MDate = ldep->de_CDate;
228 		/* leave the other fields as garbage */
229 	} else {
230 		error = readep(pmp, dirclust, diroffset, &bp, &direntptr);
231 		if (error) {
232 			/*
233 			 * The denode does not contain anything useful, so
234 			 * it would be wrong to leave it on its hash chain.
235 			 * Arrange for vput() to just forget about it.
236 			 */
237 			ldep->de_Name[0] = SLOT_DELETED;
238 			vgone(nvp);
239 			vput(nvp);
240 			*depp = NULL;
241 			return (error);
242 		}
243 		(void)DE_INTERNALIZE(ldep, direntptr);
244 		brelse(bp);
245 	}
246 
247 	/*
248 	 * Fill in a few fields of the vnode and finish filling in the
249 	 * denode.  Then return the address of the found denode.
250 	 */
251 	if (ldep->de_Attributes & ATTR_DIRECTORY) {
252 		/*
253 		 * Since DOS directory entries that describe directories
254 		 * have 0 in the filesize field, we take this opportunity
255 		 * to find out the length of the directory and plug it into
256 		 * the denode structure.
257 		 */
258 		u_long size;
259 
260 		/*
261 		 * XXX it sometimes happens that the "." entry has cluster
262 		 * number 0 when it shouldn't.  Use the actual cluster number
263 		 * instead of what is written in directory entry.
264 		 */
265 		if (diroffset == 0 && ldep->de_StartCluster != dirclust) {
266 #ifdef MSDOSFS_DEBUG
267 			printf("deget(): \".\" entry at clust %lu != %lu\n",
268 			    dirclust, ldep->de_StartCluster);
269 #endif
270 			ldep->de_StartCluster = dirclust;
271 		}
272 
273 		nvp->v_type = VDIR;
274 		if (ldep->de_StartCluster != MSDOSFSROOT) {
275 			error = pcbmap(ldep, 0xffff, 0, &size, 0);
276 			if (error == E2BIG) {
277 				ldep->de_FileSize = de_cn2off(pmp, size);
278 				error = 0;
279 			} else {
280 #ifdef MSDOSFS_DEBUG
281 				printf("deget(): pcbmap returned %d\n", error);
282 #endif
283 			}
284 		}
285 	} else
286 		nvp->v_type = VREG;
287 	ldep->de_modrev = init_va_filerev();
288 	*depp = ldep;
289 	return (0);
290 }
291 
292 int
293 deupdat(struct denode *dep, int waitfor)
294 {
295 	struct direntry dir;
296 	struct timespec ts;
297 	struct buf *bp;
298 	struct direntry *dirp;
299 	int error;
300 
301 	if (DETOV(dep)->v_mount->mnt_flag & MNT_RDONLY) {
302 		dep->de_flag &= ~(DE_UPDATE | DE_CREATE | DE_ACCESS |
303 		    DE_MODIFIED);
304 		return (0);
305 	}
306 	vfs_timestamp(&ts);
307 	DETIMES(dep, &ts, &ts, &ts);
308 	if ((dep->de_flag & DE_MODIFIED) == 0 && waitfor == 0)
309 		return (0);
310 	dep->de_flag &= ~DE_MODIFIED;
311 	if (DETOV(dep)->v_vflag & VV_ROOT)
312 		return (EINVAL);
313 	if (dep->de_refcnt <= 0)
314 		return (0);
315 	error = readde(dep, &bp, &dirp);
316 	if (error)
317 		return (error);
318 	DE_EXTERNALIZE(&dir, dep);
319 	if (bcmp(dirp, &dir, sizeof(dir)) == 0) {
320 		if (waitfor == 0 || (bp->b_flags & B_DELWRI) == 0) {
321 			brelse(bp);
322 			return (0);
323 		}
324 	} else
325 		*dirp = dir;
326 	if ((DETOV(dep)->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0)
327 		bp->b_flags |= B_CLUSTEROK;
328 	if (waitfor)
329 		error = bwrite(bp);
330 	else if (vm_page_count_severe() || buf_dirty_count_severe())
331 		bawrite(bp);
332 	else
333 		bdwrite(bp);
334 	return (error);
335 }
336 
337 /*
338  * Truncate the file described by dep to the length specified by length.
339  */
340 int
341 detrunc(struct denode *dep, u_long length, int flags, struct ucred *cred)
342 {
343 	int error;
344 	int allerror;
345 	u_long eofentry;
346 	u_long chaintofree;
347 	daddr_t bn;
348 	int boff;
349 	int isadir = dep->de_Attributes & ATTR_DIRECTORY;
350 	struct buf *bp;
351 	struct msdosfsmount *pmp = dep->de_pmp;
352 
353 #ifdef MSDOSFS_DEBUG
354 	printf("detrunc(): file %s, length %lu, flags %x\n", dep->de_Name, length, flags);
355 #endif
356 
357 	/*
358 	 * Disallow attempts to truncate the root directory since it is of
359 	 * fixed size.  That's just the way dos filesystems are.  We use
360 	 * the VROOT bit in the vnode because checking for the directory
361 	 * bit and a startcluster of 0 in the denode is not adequate to
362 	 * recognize the root directory at this point in a file or
363 	 * directory's life.
364 	 */
365 	if ((DETOV(dep)->v_vflag & VV_ROOT) && !FAT32(pmp)) {
366 #ifdef MSDOSFS_DEBUG
367 		printf("detrunc(): can't truncate root directory, clust %ld, offset %ld\n",
368 		    dep->de_dirclust, dep->de_diroffset);
369 #endif
370 		return (EINVAL);
371 	}
372 
373 	if (dep->de_FileSize < length) {
374 		vnode_pager_setsize(DETOV(dep), length);
375 		return deextend(dep, length, cred);
376 	}
377 
378 	/*
379 	 * If the desired length is 0 then remember the starting cluster of
380 	 * the file and set the StartCluster field in the directory entry
381 	 * to 0.  If the desired length is not zero, then get the number of
382 	 * the last cluster in the shortened file.  Then get the number of
383 	 * the first cluster in the part of the file that is to be freed.
384 	 * Then set the next cluster pointer in the last cluster of the
385 	 * file to CLUST_EOFE.
386 	 */
387 	if (length == 0) {
388 		chaintofree = dep->de_StartCluster;
389 		dep->de_StartCluster = 0;
390 		eofentry = ~0;
391 	} else {
392 		error = pcbmap(dep, de_clcount(pmp, length) - 1, 0,
393 			       &eofentry, 0);
394 		if (error) {
395 #ifdef MSDOSFS_DEBUG
396 			printf("detrunc(): pcbmap fails %d\n", error);
397 #endif
398 			return (error);
399 		}
400 	}
401 
402 	fc_purge(dep, de_clcount(pmp, length));
403 
404 	/*
405 	 * If the new length is not a multiple of the cluster size then we
406 	 * must zero the tail end of the new last cluster in case it
407 	 * becomes part of the file again because of a seek.
408 	 */
409 	if ((boff = length & pmp->pm_crbomask) != 0) {
410 		if (isadir) {
411 			bn = cntobn(pmp, eofentry);
412 			error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster,
413 			    NOCRED, &bp);
414 		} else {
415 			error = bread(DETOV(dep), de_cluster(pmp, length),
416 			    pmp->pm_bpcluster, cred, &bp);
417 		}
418 		if (error) {
419 #ifdef MSDOSFS_DEBUG
420 			printf("detrunc(): bread fails %d\n", error);
421 #endif
422 			return (error);
423 		}
424 		memset(bp->b_data + boff, 0, pmp->pm_bpcluster - boff);
425 		if ((flags & IO_SYNC) != 0)
426 			bwrite(bp);
427 		else
428 			bdwrite(bp);
429 	}
430 
431 	/*
432 	 * Write out the updated directory entry.  Even if the update fails
433 	 * we free the trailing clusters.
434 	 */
435 	dep->de_FileSize = length;
436 	if (!isadir)
437 		dep->de_flag |= DE_UPDATE | DE_MODIFIED;
438 	allerror = vtruncbuf(DETOV(dep), length, pmp->pm_bpcluster);
439 #ifdef MSDOSFS_DEBUG
440 	if (allerror)
441 		printf("detrunc(): vtruncbuf error %d\n", allerror);
442 #endif
443 	error = deupdat(dep, !DOINGASYNC((DETOV(dep))));
444 	if (error != 0 && allerror == 0)
445 		allerror = error;
446 #ifdef MSDOSFS_DEBUG
447 	printf("detrunc(): allerror %d, eofentry %lu\n",
448 	       allerror, eofentry);
449 #endif
450 
451 	/*
452 	 * If we need to break the cluster chain for the file then do it
453 	 * now.
454 	 */
455 	if (eofentry != ~0) {
456 		error = fatentry(FAT_GET_AND_SET, pmp, eofentry,
457 				 &chaintofree, CLUST_EOFE);
458 		if (error) {
459 #ifdef MSDOSFS_DEBUG
460 			printf("detrunc(): fatentry errors %d\n", error);
461 #endif
462 			return (error);
463 		}
464 		fc_setcache(dep, FC_LASTFC, de_cluster(pmp, length - 1),
465 			    eofentry);
466 	}
467 
468 	/*
469 	 * Now free the clusters removed from the file because of the
470 	 * truncation.
471 	 */
472 	if (chaintofree != 0 && !MSDOSFSEOF(pmp, chaintofree))
473 		freeclusterchain(pmp, chaintofree);
474 
475 	return (allerror);
476 }
477 
478 /*
479  * Extend the file described by dep to length specified by length.
480  */
481 int
482 deextend(struct denode *dep, u_long length, struct ucred *cred)
483 {
484 	struct msdosfsmount *pmp = dep->de_pmp;
485 	u_long count;
486 	int error;
487 
488 	/*
489 	 * The root of a DOS filesystem cannot be extended.
490 	 */
491 	if ((DETOV(dep)->v_vflag & VV_ROOT) && !FAT32(pmp))
492 		return (EINVAL);
493 
494 	/*
495 	 * Directories cannot be extended.
496 	 */
497 	if (dep->de_Attributes & ATTR_DIRECTORY)
498 		return (EISDIR);
499 
500 	if (length <= dep->de_FileSize)
501 		panic("deextend: file too large");
502 
503 	/*
504 	 * Compute the number of clusters to allocate.
505 	 */
506 	count = de_clcount(pmp, length) - de_clcount(pmp, dep->de_FileSize);
507 	if (count > 0) {
508 		if (count > pmp->pm_freeclustercount)
509 			return (ENOSPC);
510 		error = extendfile(dep, count, NULL, NULL, DE_CLEAR);
511 		if (error) {
512 			/* truncate the added clusters away again */
513 			(void) detrunc(dep, dep->de_FileSize, 0, cred);
514 			return (error);
515 		}
516 	}
517 	dep->de_FileSize = length;
518 	dep->de_flag |= DE_UPDATE | DE_MODIFIED;
519 	return (deupdat(dep, !DOINGASYNC(DETOV(dep))));
520 }
521 
522 /*
523  * Move a denode to its correct hash queue after the file it represents has
524  * been moved to a new directory.
525  */
526 void
527 reinsert(struct denode *dep)
528 {
529 	struct vnode *vp;
530 
531 	/*
532 	 * Fix up the denode cache.  If the denode is for a directory,
533 	 * there is nothing to do since the hash is based on the starting
534 	 * cluster of the directory file and that hasn't changed.  If for a
535 	 * file the hash is based on the location of the directory entry,
536 	 * so we must remove it from the cache and re-enter it with the
537 	 * hash based on the new location of the directory entry.
538 	 */
539 #if 0
540 	if (dep->de_Attributes & ATTR_DIRECTORY)
541 		return;
542 #endif
543 	vp = DETOV(dep);
544 	dep->de_inode = (uint64_t)dep->de_pmp->pm_bpcluster * dep->de_dirclust +
545 	    dep->de_diroffset;
546 	vfs_hash_rehash(vp, dep->de_inode);
547 }
548 
549 int
550 msdosfs_reclaim(struct vop_reclaim_args *ap)
551 {
552 	struct vnode *vp = ap->a_vp;
553 	struct denode *dep = VTODE(vp);
554 
555 #ifdef MSDOSFS_DEBUG
556 	printf("msdosfs_reclaim(): dep %p, file %s, refcnt %ld\n",
557 	    dep, dep->de_Name, dep->de_refcnt);
558 #endif
559 
560 	/*
561 	 * Remove the denode from its hash chain.
562 	 */
563 	vfs_hash_remove(vp);
564 	/*
565 	 * Purge old data structures associated with the denode.
566 	 */
567 #if 0 /* XXX */
568 	dep->de_flag = 0;
569 #endif
570 	free(dep, M_MSDOSFSNODE);
571 	vp->v_data = NULL;
572 
573 	return (0);
574 }
575 
576 int
577 msdosfs_inactive(struct vop_inactive_args *ap)
578 {
579 	struct vnode *vp = ap->a_vp;
580 	struct denode *dep = VTODE(vp);
581 	int error = 0;
582 
583 #ifdef MSDOSFS_DEBUG
584 	printf("msdosfs_inactive(): dep %p, de_Name[0] %x\n", dep, dep->de_Name[0]);
585 #endif
586 
587 	/*
588 	 * Ignore denodes related to stale file handles.
589 	 */
590 	if (dep->de_Name[0] == SLOT_DELETED || dep->de_Name[0] == SLOT_EMPTY)
591 		goto out;
592 
593 	/*
594 	 * If the file has been deleted and it is on a read/write
595 	 * filesystem, then truncate the file, and mark the directory slot
596 	 * as empty.  (This may not be necessary for the dos filesystem.)
597 	 */
598 #ifdef MSDOSFS_DEBUG
599 	printf("msdosfs_inactive(): dep %p, refcnt %ld, mntflag %llx, MNT_RDONLY %llx\n",
600 	    dep, dep->de_refcnt, (unsigned long long)vp->v_mount->mnt_flag,
601 	    (unsigned long long)MNT_RDONLY);
602 #endif
603 	if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
604 		error = detrunc(dep, (u_long) 0, 0, NOCRED);
605 		dep->de_flag |= DE_UPDATE;
606 		dep->de_Name[0] = SLOT_DELETED;
607 	}
608 	deupdat(dep, 0);
609 
610 out:
611 	/*
612 	 * If we are done with the denode, reclaim it
613 	 * so that it can be reused immediately.
614 	 */
615 #ifdef MSDOSFS_DEBUG
616 	printf("msdosfs_inactive(): v_usecount %d, de_Name[0] %x\n",
617 	       vrefcnt(vp), dep->de_Name[0]);
618 #endif
619 	if (dep->de_Name[0] == SLOT_DELETED || dep->de_Name[0] == SLOT_EMPTY)
620 		vrecycle(vp);
621 	return (error);
622 }
623