The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/fs/msdosfs/msdosfs_denode.c

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    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         lockmgr(nvp->v_vnlock, LK_EXCLUSIVE, NULL);
  169         VN_LOCK_AREC(nvp);      /* for doscheckpath */
  170         fc_purge(ldep, 0);      /* init the FAT cache for this denode */
  171         error = insmntque(nvp, mntp);
  172         if (error != 0) {
  173                 free(ldep, M_MSDOSFSNODE);
  174                 *depp = NULL;
  175                 return (error);
  176         }
  177         error = vfs_hash_insert(nvp, inode, lkflags, curthread, &xvp,
  178             de_vncmpf, &inode);
  179         if (error) {
  180                 *depp = NULL;
  181                 return (error);
  182         }
  183         if (xvp != NULL) {
  184                 *depp = xvp->v_data;
  185                 return (0);
  186         }
  187 
  188         ldep->de_pmp = pmp;
  189         ldep->de_refcnt = 1;
  190         /*
  191          * Copy the directory entry into the denode area of the vnode.
  192          */
  193         if ((dirclust == MSDOSFSROOT
  194              || (FAT32(pmp) && dirclust == pmp->pm_rootdirblk))
  195             && diroffset == MSDOSFSROOT_OFS) {
  196                 /*
  197                  * Directory entry for the root directory. There isn't one,
  198                  * so we manufacture one. We should probably rummage
  199                  * through the root directory and find a label entry (if it
  200                  * exists), and then use the time and date from that entry
  201                  * as the time and date for the root denode.
  202                  */
  203                 nvp->v_vflag |= VV_ROOT; /* should be further down XXX */
  204 
  205                 ldep->de_Attributes = ATTR_DIRECTORY;
  206                 ldep->de_LowerCase = 0;
  207                 if (FAT32(pmp))
  208                         ldep->de_StartCluster = pmp->pm_rootdirblk;
  209                         /* de_FileSize will be filled in further down */
  210                 else {
  211                         ldep->de_StartCluster = MSDOSFSROOT;
  212                         ldep->de_FileSize = pmp->pm_rootdirsize * DEV_BSIZE;
  213                 }
  214                 /*
  215                  * fill in time and date so that fattime2timespec() doesn't
  216                  * spit up when called from msdosfs_getattr() with root
  217                  * denode
  218                  */
  219                 ldep->de_CHun = 0;
  220                 ldep->de_CTime = 0x0000;        /* 00:00:00      */
  221                 ldep->de_CDate = (0 << DD_YEAR_SHIFT) | (1 << DD_MONTH_SHIFT)
  222                     | (1 << DD_DAY_SHIFT);
  223                 /* Jan 1, 1980   */
  224                 ldep->de_ADate = ldep->de_CDate;
  225                 ldep->de_MTime = ldep->de_CTime;
  226                 ldep->de_MDate = ldep->de_CDate;
  227                 /* leave the other fields as garbage */
  228         } else {
  229                 error = readep(pmp, dirclust, diroffset, &bp, &direntptr);
  230                 if (error) {
  231                         /*
  232                          * The denode does not contain anything useful, so
  233                          * it would be wrong to leave it on its hash chain.
  234                          * Arrange for vput() to just forget about it.
  235                          */
  236                         ldep->de_Name[0] = SLOT_DELETED;
  237                         vgone(nvp);
  238                         vput(nvp);
  239                         *depp = NULL;
  240                         return (error);
  241                 }
  242                 (void)DE_INTERNALIZE(ldep, direntptr);
  243                 brelse(bp);
  244         }
  245 
  246         /*
  247          * Fill in a few fields of the vnode and finish filling in the
  248          * denode.  Then return the address of the found denode.
  249          */
  250         if (ldep->de_Attributes & ATTR_DIRECTORY) {
  251                 /*
  252                  * Since DOS directory entries that describe directories
  253                  * have 0 in the filesize field, we take this opportunity
  254                  * to find out the length of the directory and plug it into
  255                  * the denode structure.
  256                  */
  257                 u_long size;
  258 
  259                 /*
  260                  * XXX it sometimes happens that the "." entry has cluster
  261                  * number 0 when it shouldn't.  Use the actual cluster number
  262                  * instead of what is written in directory entry.
  263                  */
  264                 if (diroffset == 0 && ldep->de_StartCluster != dirclust) {
  265 #ifdef MSDOSFS_DEBUG
  266                         printf("deget(): \".\" entry at clust %lu != %lu\n",
  267                             dirclust, ldep->de_StartCluster);
  268 #endif
  269                         ldep->de_StartCluster = dirclust;
  270                 }
  271 
  272                 nvp->v_type = VDIR;
  273                 if (ldep->de_StartCluster != MSDOSFSROOT) {
  274                         error = pcbmap(ldep, 0xffff, 0, &size, 0);
  275                         if (error == E2BIG) {
  276                                 ldep->de_FileSize = de_cn2off(pmp, size);
  277                                 error = 0;
  278                         } else {
  279 #ifdef MSDOSFS_DEBUG
  280                                 printf("deget(): pcbmap returned %d\n", error);
  281 #endif
  282                         }
  283                 }
  284         } else
  285                 nvp->v_type = VREG;
  286         ldep->de_modrev = init_va_filerev();
  287         *depp = ldep;
  288         return (0);
  289 }
  290 
  291 int
  292 deupdat(struct denode *dep, int waitfor)
  293 {
  294         struct direntry dir;
  295         struct timespec ts;
  296         struct buf *bp;
  297         struct direntry *dirp;
  298         int error;
  299 
  300         if (DETOV(dep)->v_mount->mnt_flag & MNT_RDONLY) {
  301                 dep->de_flag &= ~(DE_UPDATE | DE_CREATE | DE_ACCESS |
  302                     DE_MODIFIED);
  303                 return (0);
  304         }
  305         vfs_timestamp(&ts);
  306         DETIMES(dep, &ts, &ts, &ts);
  307         if ((dep->de_flag & DE_MODIFIED) == 0 && waitfor == 0)
  308                 return (0);
  309         dep->de_flag &= ~DE_MODIFIED;
  310         if (DETOV(dep)->v_vflag & VV_ROOT)
  311                 return (EINVAL);
  312         if (dep->de_refcnt <= 0)
  313                 return (0);
  314         error = readde(dep, &bp, &dirp);
  315         if (error)
  316                 return (error);
  317         DE_EXTERNALIZE(&dir, dep);
  318         if (bcmp(dirp, &dir, sizeof(dir)) == 0) {
  319                 if (waitfor == 0 || (bp->b_flags & B_DELWRI) == 0) {
  320                         brelse(bp);
  321                         return (0);
  322                 }
  323         } else
  324                 *dirp = dir;
  325         if ((DETOV(dep)->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0)
  326                 bp->b_flags |= B_CLUSTEROK;
  327         if (waitfor)
  328                 error = bwrite(bp);
  329         else if (vm_page_count_severe() || buf_dirty_count_severe())
  330                 bawrite(bp);
  331         else
  332                 bdwrite(bp);
  333         return (error);
  334 }
  335 
  336 /*
  337  * Truncate the file described by dep to the length specified by length.
  338  */
  339 int
  340 detrunc(struct denode *dep, u_long length, int flags, struct ucred *cred)
  341 {
  342         int error;
  343         int allerror;
  344         u_long eofentry;
  345         u_long chaintofree;
  346         daddr_t bn;
  347         int boff;
  348         int isadir = dep->de_Attributes & ATTR_DIRECTORY;
  349         struct buf *bp;
  350         struct msdosfsmount *pmp = dep->de_pmp;
  351 
  352 #ifdef MSDOSFS_DEBUG
  353         printf("detrunc(): file %s, length %lu, flags %x\n", dep->de_Name, length, flags);
  354 #endif
  355 
  356         /*
  357          * Disallow attempts to truncate the root directory since it is of
  358          * fixed size.  That's just the way dos filesystems are.  We use
  359          * the VROOT bit in the vnode because checking for the directory
  360          * bit and a startcluster of 0 in the denode is not adequate to
  361          * recognize the root directory at this point in a file or
  362          * directory's life.
  363          */
  364         if ((DETOV(dep)->v_vflag & VV_ROOT) && !FAT32(pmp)) {
  365 #ifdef MSDOSFS_DEBUG
  366                 printf("detrunc(): can't truncate root directory, clust %ld, offset %ld\n",
  367                     dep->de_dirclust, dep->de_diroffset);
  368 #endif
  369                 return (EINVAL);
  370         }
  371 
  372         if (dep->de_FileSize < length) {
  373                 vnode_pager_setsize(DETOV(dep), length);
  374                 return deextend(dep, length, cred);
  375         }
  376 
  377         /*
  378          * If the desired length is 0 then remember the starting cluster of
  379          * the file and set the StartCluster field in the directory entry
  380          * to 0.  If the desired length is not zero, then get the number of
  381          * the last cluster in the shortened file.  Then get the number of
  382          * the first cluster in the part of the file that is to be freed.
  383          * Then set the next cluster pointer in the last cluster of the
  384          * file to CLUST_EOFE.
  385          */
  386         if (length == 0) {
  387                 chaintofree = dep->de_StartCluster;
  388                 dep->de_StartCluster = 0;
  389                 eofentry = ~0;
  390         } else {
  391                 error = pcbmap(dep, de_clcount(pmp, length) - 1, 0,
  392                                &eofentry, 0);
  393                 if (error) {
  394 #ifdef MSDOSFS_DEBUG
  395                         printf("detrunc(): pcbmap fails %d\n", error);
  396 #endif
  397                         return (error);
  398                 }
  399         }
  400 
  401         fc_purge(dep, de_clcount(pmp, length));
  402 
  403         /*
  404          * If the new length is not a multiple of the cluster size then we
  405          * must zero the tail end of the new last cluster in case it
  406          * becomes part of the file again because of a seek.
  407          */
  408         if ((boff = length & pmp->pm_crbomask) != 0) {
  409                 if (isadir) {
  410                         bn = cntobn(pmp, eofentry);
  411                         error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster,
  412                             NOCRED, &bp);
  413                 } else {
  414                         error = bread(DETOV(dep), de_cluster(pmp, length),
  415                             pmp->pm_bpcluster, cred, &bp);
  416                 }
  417                 if (error) {
  418 #ifdef MSDOSFS_DEBUG
  419                         printf("detrunc(): bread fails %d\n", error);
  420 #endif
  421                         return (error);
  422                 }
  423                 memset(bp->b_data + boff, 0, pmp->pm_bpcluster - boff);
  424                 if ((flags & IO_SYNC) != 0)
  425                         bwrite(bp);
  426                 else
  427                         bdwrite(bp);
  428         }
  429 
  430         /*
  431          * Write out the updated directory entry.  Even if the update fails
  432          * we free the trailing clusters.
  433          */
  434         dep->de_FileSize = length;
  435         if (!isadir)
  436                 dep->de_flag |= DE_UPDATE | DE_MODIFIED;
  437         allerror = vtruncbuf(DETOV(dep), length, pmp->pm_bpcluster);
  438 #ifdef MSDOSFS_DEBUG
  439         if (allerror)
  440                 printf("detrunc(): vtruncbuf error %d\n", allerror);
  441 #endif
  442         error = deupdat(dep, !DOINGASYNC((DETOV(dep))));
  443         if (error != 0 && allerror == 0)
  444                 allerror = error;
  445 #ifdef MSDOSFS_DEBUG
  446         printf("detrunc(): allerror %d, eofentry %lu\n",
  447                allerror, eofentry);
  448 #endif
  449 
  450         /*
  451          * If we need to break the cluster chain for the file then do it
  452          * now.
  453          */
  454         if (eofentry != ~0) {
  455                 error = fatentry(FAT_GET_AND_SET, pmp, eofentry,
  456                                  &chaintofree, CLUST_EOFE);
  457                 if (error) {
  458 #ifdef MSDOSFS_DEBUG
  459                         printf("detrunc(): fatentry errors %d\n", error);
  460 #endif
  461                         return (error);
  462                 }
  463                 fc_setcache(dep, FC_LASTFC, de_cluster(pmp, length - 1),
  464                             eofentry);
  465         }
  466 
  467         /*
  468          * Now free the clusters removed from the file because of the
  469          * truncation.
  470          */
  471         if (chaintofree != 0 && !MSDOSFSEOF(pmp, chaintofree))
  472                 freeclusterchain(pmp, chaintofree);
  473 
  474         return (allerror);
  475 }
  476 
  477 /*
  478  * Extend the file described by dep to length specified by length.
  479  */
  480 int
  481 deextend(struct denode *dep, u_long length, struct ucred *cred)
  482 {
  483         struct msdosfsmount *pmp = dep->de_pmp;
  484         u_long count;
  485         int error;
  486 
  487         /*
  488          * The root of a DOS filesystem cannot be extended.
  489          */
  490         if ((DETOV(dep)->v_vflag & VV_ROOT) && !FAT32(pmp))
  491                 return (EINVAL);
  492 
  493         /*
  494          * Directories cannot be extended.
  495          */
  496         if (dep->de_Attributes & ATTR_DIRECTORY)
  497                 return (EISDIR);
  498 
  499         if (length <= dep->de_FileSize)
  500                 panic("deextend: file too large");
  501 
  502         /*
  503          * Compute the number of clusters to allocate.
  504          */
  505         count = de_clcount(pmp, length) - de_clcount(pmp, dep->de_FileSize);
  506         if (count > 0) {
  507                 if (count > pmp->pm_freeclustercount)
  508                         return (ENOSPC);
  509                 error = extendfile(dep, count, NULL, NULL, DE_CLEAR);
  510                 if (error) {
  511                         /* truncate the added clusters away again */
  512                         (void) detrunc(dep, dep->de_FileSize, 0, cred);
  513                         return (error);
  514                 }
  515         }
  516         dep->de_FileSize = length;
  517         dep->de_flag |= DE_UPDATE | DE_MODIFIED;
  518         return (deupdat(dep, !DOINGASYNC(DETOV(dep))));
  519 }
  520 
  521 /*
  522  * Move a denode to its correct hash queue after the file it represents has
  523  * been moved to a new directory.
  524  */
  525 void
  526 reinsert(struct denode *dep)
  527 {
  528         struct vnode *vp;
  529 
  530         /*
  531          * Fix up the denode cache.  If the denode is for a directory,
  532          * there is nothing to do since the hash is based on the starting
  533          * cluster of the directory file and that hasn't changed.  If for a
  534          * file the hash is based on the location of the directory entry,
  535          * so we must remove it from the cache and re-enter it with the
  536          * hash based on the new location of the directory entry.
  537          */
  538 #if 0
  539         if (dep->de_Attributes & ATTR_DIRECTORY)
  540                 return;
  541 #endif
  542         vp = DETOV(dep);
  543         dep->de_inode = (uint64_t)dep->de_pmp->pm_bpcluster * dep->de_dirclust +
  544             dep->de_diroffset;
  545         vfs_hash_rehash(vp, dep->de_inode);
  546 }
  547 
  548 int
  549 msdosfs_reclaim(struct vop_reclaim_args *ap)
  550 {
  551         struct vnode *vp = ap->a_vp;
  552         struct denode *dep = VTODE(vp);
  553 
  554 #ifdef MSDOSFS_DEBUG
  555         printf("msdosfs_reclaim(): dep %p, file %s, refcnt %ld\n",
  556             dep, dep->de_Name, dep->de_refcnt);
  557 #endif
  558 
  559         /*
  560          * Remove the denode from its hash chain.
  561          */
  562         vfs_hash_remove(vp);
  563         /*
  564          * Purge old data structures associated with the denode.
  565          */
  566 #if 0 /* XXX */
  567         dep->de_flag = 0;
  568 #endif
  569         free(dep, M_MSDOSFSNODE);
  570         vp->v_data = NULL;
  571 
  572         return (0);
  573 }
  574 
  575 int
  576 msdosfs_inactive(struct vop_inactive_args *ap)
  577 {
  578         struct vnode *vp = ap->a_vp;
  579         struct denode *dep = VTODE(vp);
  580         int error = 0;
  581 
  582 #ifdef MSDOSFS_DEBUG
  583         printf("msdosfs_inactive(): dep %p, de_Name[0] %x\n", dep, dep->de_Name[0]);
  584 #endif
  585 
  586         /*
  587          * Ignore denodes related to stale file handles.
  588          */
  589         if (dep->de_Name[0] == SLOT_DELETED || dep->de_Name[0] == SLOT_EMPTY)
  590                 goto out;
  591 
  592         /*
  593          * If the file has been deleted and it is on a read/write
  594          * filesystem, then truncate the file, and mark the directory slot
  595          * as empty.  (This may not be necessary for the dos filesystem.)
  596          */
  597 #ifdef MSDOSFS_DEBUG
  598         printf("msdosfs_inactive(): dep %p, refcnt %ld, mntflag %llx, MNT_RDONLY %llx\n",
  599             dep, dep->de_refcnt, (unsigned long long)vp->v_mount->mnt_flag,
  600             (unsigned long long)MNT_RDONLY);
  601 #endif
  602         if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
  603                 error = detrunc(dep, (u_long) 0, 0, NOCRED);
  604                 dep->de_flag |= DE_UPDATE;
  605                 dep->de_Name[0] = SLOT_DELETED;
  606         }
  607         deupdat(dep, 0);
  608 
  609 out:
  610         /*
  611          * If we are done with the denode, reclaim it
  612          * so that it can be reused immediately.
  613          */
  614 #ifdef MSDOSFS_DEBUG
  615         printf("msdosfs_inactive(): v_usecount %d, de_Name[0] %x\n",
  616                vrefcnt(vp), dep->de_Name[0]);
  617 #endif
  618         if (dep->de_Name[0] == SLOT_DELETED || dep->de_Name[0] == SLOT_EMPTY)
  619                 vrecycle(vp);
  620         return (error);
  621 }

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