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

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    1 /* $FreeBSD: releng/11.0/sys/fs/msdosfs/msdosfs_denode.c 276887 2015-01-09 14:50:08Z emaste $ */
    2 /*      $NetBSD: msdosfs_denode.c,v 1.28 1998/02/10 14:10:00 mrg 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/buf.h>
   54 #include <sys/clock.h>
   55 #include <sys/kernel.h>
   56 #include <sys/malloc.h>
   57 #include <sys/mount.h>
   58 #include <sys/vnode.h>
   59 
   60 #include <vm/vm.h>
   61 #include <vm/vm_extern.h>
   62 
   63 #include <fs/msdosfs/bpb.h>
   64 #include <fs/msdosfs/direntry.h>
   65 #include <fs/msdosfs/denode.h>
   66 #include <fs/msdosfs/fat.h>
   67 #include <fs/msdosfs/msdosfsmount.h>
   68 
   69 static MALLOC_DEFINE(M_MSDOSFSNODE, "msdosfs_node", "MSDOSFS vnode private part");
   70 
   71 static int
   72 de_vncmpf(struct vnode *vp, void *arg)
   73 {
   74         struct denode *de;
   75         uint64_t *a;
   76 
   77         a = arg;
   78         de = VTODE(vp);
   79         return (de->de_inode != *a);
   80 }
   81 
   82 /*
   83  * If deget() succeeds it returns with the gotten denode locked().
   84  *
   85  * pmp       - address of msdosfsmount structure of the filesystem containing
   86  *             the denode of interest.  The address of
   87  *             the msdosfsmount structure are used.
   88  * dirclust  - which cluster bp contains, if dirclust is 0 (root directory)
   89  *             diroffset is relative to the beginning of the root directory,
   90  *             otherwise it is cluster relative.
   91  * diroffset - offset past begin of cluster of denode we want
   92  * depp      - returns the address of the gotten denode.
   93  */
   94 int
   95 deget(struct msdosfsmount *pmp, u_long dirclust, u_long diroffset,
   96     struct denode **depp)
   97 {
   98         int error;
   99         uint64_t inode;
  100         struct mount *mntp = pmp->pm_mountp;
  101         struct direntry *direntptr;
  102         struct denode *ldep;
  103         struct vnode *nvp, *xvp;
  104         struct buf *bp;
  105 
  106 #ifdef MSDOSFS_DEBUG
  107         printf("deget(pmp %p, dirclust %lu, diroffset %lx, depp %p)\n",
  108             pmp, dirclust, diroffset, depp);
  109 #endif
  110 
  111         /*
  112          * On FAT32 filesystems, root is a (more or less) normal
  113          * directory
  114          */
  115         if (FAT32(pmp) && dirclust == MSDOSFSROOT)
  116                 dirclust = pmp->pm_rootdirblk;
  117 
  118         /*
  119          * See if the denode is in the denode cache. Use the location of
  120          * the directory entry to compute the hash value. For subdir use
  121          * address of "." entry. For root dir (if not FAT32) use cluster
  122          * MSDOSFSROOT, offset MSDOSFSROOT_OFS
  123          *
  124          * NOTE: The check for de_refcnt > 0 below insures the denode being
  125          * examined does not represent an unlinked but still open file.
  126          * These files are not to be accessible even when the directory
  127          * entry that represented the file happens to be reused while the
  128          * deleted file is still open.
  129          */
  130         inode = (uint64_t)pmp->pm_bpcluster * dirclust + diroffset;
  131 
  132         error = vfs_hash_get(mntp, inode, LK_EXCLUSIVE, curthread, &nvp,
  133             de_vncmpf, &inode);
  134         if (error)
  135                 return (error);
  136         if (nvp != NULL) {
  137                 *depp = VTODE(nvp);
  138                 KASSERT((*depp)->de_dirclust == dirclust, ("wrong dirclust"));
  139                 KASSERT((*depp)->de_diroffset == diroffset, ("wrong diroffset"));
  140                 return (0);
  141         }
  142         ldep = malloc(sizeof(struct denode), M_MSDOSFSNODE, M_WAITOK | M_ZERO);
  143 
  144         /*
  145          * Directory entry was not in cache, have to create a vnode and
  146          * copy it from the passed disk buffer.
  147          */
  148         /* getnewvnode() does a VREF() on the vnode */
  149         error = getnewvnode("msdosfs", mntp, &msdosfs_vnodeops, &nvp);
  150         if (error) {
  151                 *depp = NULL;
  152                 free(ldep, M_MSDOSFSNODE);
  153                 return error;
  154         }
  155         nvp->v_data = ldep;
  156         ldep->de_vnode = nvp;
  157         ldep->de_flag = 0;
  158         ldep->de_dirclust = dirclust;
  159         ldep->de_diroffset = diroffset;
  160         ldep->de_inode = inode;
  161         lockmgr(nvp->v_vnlock, LK_EXCLUSIVE, NULL);
  162         fc_purge(ldep, 0);      /* init the fat cache for this denode */
  163         error = insmntque(nvp, mntp);
  164         if (error != 0) {
  165                 free(ldep, M_MSDOSFSNODE);
  166                 *depp = NULL;
  167                 return (error);
  168         }
  169         error = vfs_hash_insert(nvp, inode, LK_EXCLUSIVE, curthread, &xvp,
  170             de_vncmpf, &inode);
  171         if (error) {
  172                 *depp = NULL;
  173                 return (error);
  174         }
  175         if (xvp != NULL) {
  176                 *depp = xvp->v_data;
  177                 return (0);
  178         }
  179 
  180         ldep->de_pmp = pmp;
  181         ldep->de_refcnt = 1;
  182         /*
  183          * Copy the directory entry into the denode area of the vnode.
  184          */
  185         if ((dirclust == MSDOSFSROOT
  186              || (FAT32(pmp) && dirclust == pmp->pm_rootdirblk))
  187             && diroffset == MSDOSFSROOT_OFS) {
  188                 /*
  189                  * Directory entry for the root directory. There isn't one,
  190                  * so we manufacture one. We should probably rummage
  191                  * through the root directory and find a label entry (if it
  192                  * exists), and then use the time and date from that entry
  193                  * as the time and date for the root denode.
  194                  */
  195                 nvp->v_vflag |= VV_ROOT; /* should be further down XXX */
  196 
  197                 ldep->de_Attributes = ATTR_DIRECTORY;
  198                 ldep->de_LowerCase = 0;
  199                 if (FAT32(pmp))
  200                         ldep->de_StartCluster = pmp->pm_rootdirblk;
  201                         /* de_FileSize will be filled in further down */
  202                 else {
  203                         ldep->de_StartCluster = MSDOSFSROOT;
  204                         ldep->de_FileSize = pmp->pm_rootdirsize * DEV_BSIZE;
  205                 }
  206                 /*
  207                  * fill in time and date so that fattime2timespec() doesn't
  208                  * spit up when called from msdosfs_getattr() with root
  209                  * denode
  210                  */
  211                 ldep->de_CHun = 0;
  212                 ldep->de_CTime = 0x0000;        /* 00:00:00      */
  213                 ldep->de_CDate = (0 << DD_YEAR_SHIFT) | (1 << DD_MONTH_SHIFT)
  214                     | (1 << DD_DAY_SHIFT);
  215                 /* Jan 1, 1980   */
  216                 ldep->de_ADate = ldep->de_CDate;
  217                 ldep->de_MTime = ldep->de_CTime;
  218                 ldep->de_MDate = ldep->de_CDate;
  219                 /* leave the other fields as garbage */
  220         } else {
  221                 error = readep(pmp, dirclust, diroffset, &bp, &direntptr);
  222                 if (error) {
  223                         /*
  224                          * The denode does not contain anything useful, so
  225                          * it would be wrong to leave it on its hash chain.
  226                          * Arrange for vput() to just forget about it.
  227                          */
  228                         ldep->de_Name[0] = SLOT_DELETED;
  229 
  230                         vput(nvp);
  231                         *depp = NULL;
  232                         return (error);
  233                 }
  234                 (void)DE_INTERNALIZE(ldep, direntptr);
  235                 brelse(bp);
  236         }
  237 
  238         /*
  239          * Fill in a few fields of the vnode and finish filling in the
  240          * denode.  Then return the address of the found denode.
  241          */
  242         if (ldep->de_Attributes & ATTR_DIRECTORY) {
  243                 /*
  244                  * Since DOS directory entries that describe directories
  245                  * have 0 in the filesize field, we take this opportunity
  246                  * to find out the length of the directory and plug it into
  247                  * the denode structure.
  248                  */
  249                 u_long size;
  250 
  251                 /*
  252                  * XXX it sometimes happens that the "." entry has cluster
  253                  * number 0 when it shouldn't.  Use the actual cluster number
  254                  * instead of what is written in directory entry.
  255                  */
  256                 if (diroffset == 0 && ldep->de_StartCluster != dirclust) {
  257 #ifdef MSDOSFS_DEBUG
  258                         printf("deget(): \".\" entry at clust %lu != %lu\n",
  259                             dirclust, ldep->de_StartCluster);
  260 #endif
  261                         ldep->de_StartCluster = dirclust;
  262                 }
  263 
  264                 nvp->v_type = VDIR;
  265                 if (ldep->de_StartCluster != MSDOSFSROOT) {
  266                         error = pcbmap(ldep, 0xffff, 0, &size, 0);
  267                         if (error == E2BIG) {
  268                                 ldep->de_FileSize = de_cn2off(pmp, size);
  269                                 error = 0;
  270                         } else {
  271 #ifdef MSDOSFS_DEBUG
  272                                 printf("deget(): pcbmap returned %d\n", error);
  273 #endif
  274                         }
  275                 }
  276         } else
  277                 nvp->v_type = VREG;
  278         ldep->de_modrev = init_va_filerev();
  279         *depp = ldep;
  280         return (0);
  281 }
  282 
  283 int
  284 deupdat(struct denode *dep, int waitfor)
  285 {
  286         struct direntry dir;
  287         struct timespec ts;
  288         struct buf *bp;
  289         struct direntry *dirp;
  290         int error;
  291 
  292         if (DETOV(dep)->v_mount->mnt_flag & MNT_RDONLY) {
  293                 dep->de_flag &= ~(DE_UPDATE | DE_CREATE | DE_ACCESS |
  294                     DE_MODIFIED);
  295                 return (0);
  296         }
  297         getnanotime(&ts);
  298         DETIMES(dep, &ts, &ts, &ts);
  299         if ((dep->de_flag & DE_MODIFIED) == 0 && waitfor == 0)
  300                 return (0);
  301         dep->de_flag &= ~DE_MODIFIED;
  302         if (DETOV(dep)->v_vflag & VV_ROOT)
  303                 return (EINVAL);
  304         if (dep->de_refcnt <= 0)
  305                 return (0);
  306         error = readde(dep, &bp, &dirp);
  307         if (error)
  308                 return (error);
  309         DE_EXTERNALIZE(&dir, dep);
  310         if (bcmp(dirp, &dir, sizeof(dir)) == 0) {
  311                 if (waitfor == 0 || (bp->b_flags & B_DELWRI) == 0) {
  312                         brelse(bp);
  313                         return (0);
  314                 }
  315         } else
  316                 *dirp = dir;
  317         if ((DETOV(dep)->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0)
  318                 bp->b_flags |= B_CLUSTEROK;
  319         if (waitfor)
  320                 error = bwrite(bp);
  321         else if (vm_page_count_severe() || buf_dirty_count_severe())
  322                 bawrite(bp);
  323         else
  324                 bdwrite(bp);
  325         return (error);
  326 }
  327 
  328 /*
  329  * Truncate the file described by dep to the length specified by length.
  330  */
  331 int
  332 detrunc(struct denode *dep, u_long length, int flags, struct ucred *cred)
  333 {
  334         int error;
  335         int allerror;
  336         u_long eofentry;
  337         u_long chaintofree;
  338         daddr_t bn;
  339         int boff;
  340         int isadir = dep->de_Attributes & ATTR_DIRECTORY;
  341         struct buf *bp;
  342         struct msdosfsmount *pmp = dep->de_pmp;
  343 
  344 #ifdef MSDOSFS_DEBUG
  345         printf("detrunc(): file %s, length %lu, flags %x\n", dep->de_Name, length, flags);
  346 #endif
  347 
  348         /*
  349          * Disallow attempts to truncate the root directory since it is of
  350          * fixed size.  That's just the way dos filesystems are.  We use
  351          * the VROOT bit in the vnode because checking for the directory
  352          * bit and a startcluster of 0 in the denode is not adequate to
  353          * recognize the root directory at this point in a file or
  354          * directory's life.
  355          */
  356         if ((DETOV(dep)->v_vflag & VV_ROOT) && !FAT32(pmp)) {
  357 #ifdef MSDOSFS_DEBUG
  358                 printf("detrunc(): can't truncate root directory, clust %ld, offset %ld\n",
  359                     dep->de_dirclust, dep->de_diroffset);
  360 #endif
  361                 return (EINVAL);
  362         }
  363 
  364         if (dep->de_FileSize < length) {
  365                 vnode_pager_setsize(DETOV(dep), length);
  366                 return deextend(dep, length, cred);
  367         }
  368 
  369         /*
  370          * If the desired length is 0 then remember the starting cluster of
  371          * the file and set the StartCluster field in the directory entry
  372          * to 0.  If the desired length is not zero, then get the number of
  373          * the last cluster in the shortened file.  Then get the number of
  374          * the first cluster in the part of the file that is to be freed.
  375          * Then set the next cluster pointer in the last cluster of the
  376          * file to CLUST_EOFE.
  377          */
  378         if (length == 0) {
  379                 chaintofree = dep->de_StartCluster;
  380                 dep->de_StartCluster = 0;
  381                 eofentry = ~0;
  382         } else {
  383                 error = pcbmap(dep, de_clcount(pmp, length) - 1, 0, 
  384                                &eofentry, 0);
  385                 if (error) {
  386 #ifdef MSDOSFS_DEBUG
  387                         printf("detrunc(): pcbmap fails %d\n", error);
  388 #endif
  389                         return (error);
  390                 }
  391         }
  392 
  393         fc_purge(dep, de_clcount(pmp, length));
  394 
  395         /*
  396          * If the new length is not a multiple of the cluster size then we
  397          * must zero the tail end of the new last cluster in case it
  398          * becomes part of the file again because of a seek.
  399          */
  400         if ((boff = length & pmp->pm_crbomask) != 0) {
  401                 if (isadir) {
  402                         bn = cntobn(pmp, eofentry);
  403                         error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster,
  404                             NOCRED, &bp);
  405                         if (error) {
  406                                 brelse(bp);
  407 #ifdef MSDOSFS_DEBUG
  408                                 printf("detrunc(): bread fails %d\n", error);
  409 #endif
  410                                 return (error);
  411                         }
  412                         bzero(bp->b_data + boff, pmp->pm_bpcluster - boff);
  413                         if (flags & IO_SYNC)
  414                                 bwrite(bp);
  415                         else
  416                                 bdwrite(bp);
  417                 }
  418         }
  419 
  420         /*
  421          * Write out the updated directory entry.  Even if the update fails
  422          * we free the trailing clusters.
  423          */
  424         dep->de_FileSize = length;
  425         if (!isadir)
  426                 dep->de_flag |= DE_UPDATE | DE_MODIFIED;
  427         allerror = vtruncbuf(DETOV(dep), cred, length, pmp->pm_bpcluster);
  428 #ifdef MSDOSFS_DEBUG
  429         if (allerror)
  430                 printf("detrunc(): vtruncbuf error %d\n", allerror);
  431 #endif
  432         error = deupdat(dep, !DOINGASYNC((DETOV(dep))));
  433         if (error != 0 && allerror == 0)
  434                 allerror = error;
  435 #ifdef MSDOSFS_DEBUG
  436         printf("detrunc(): allerror %d, eofentry %lu\n",
  437                allerror, eofentry);
  438 #endif
  439 
  440         /*
  441          * If we need to break the cluster chain for the file then do it
  442          * now.
  443          */
  444         if (eofentry != ~0) {
  445                 error = fatentry(FAT_GET_AND_SET, pmp, eofentry,
  446                                  &chaintofree, CLUST_EOFE);
  447                 if (error) {
  448 #ifdef MSDOSFS_DEBUG
  449                         printf("detrunc(): fatentry errors %d\n", error);
  450 #endif
  451                         return (error);
  452                 }
  453                 fc_setcache(dep, FC_LASTFC, de_cluster(pmp, length - 1),
  454                             eofentry);
  455         }
  456 
  457         /*
  458          * Now free the clusters removed from the file because of the
  459          * truncation.
  460          */
  461         if (chaintofree != 0 && !MSDOSFSEOF(pmp, chaintofree))
  462                 freeclusterchain(pmp, chaintofree);
  463 
  464         return (allerror);
  465 }
  466 
  467 /*
  468  * Extend the file described by dep to length specified by length.
  469  */
  470 int
  471 deextend(struct denode *dep, u_long length, struct ucred *cred)
  472 {
  473         struct msdosfsmount *pmp = dep->de_pmp;
  474         u_long count;
  475         int error;
  476 
  477         /*
  478          * The root of a DOS filesystem cannot be extended.
  479          */
  480         if ((DETOV(dep)->v_vflag & VV_ROOT) && !FAT32(pmp))
  481                 return (EINVAL);
  482 
  483         /*
  484          * Directories cannot be extended.
  485          */
  486         if (dep->de_Attributes & ATTR_DIRECTORY)
  487                 return (EISDIR);
  488 
  489         if (length <= dep->de_FileSize)
  490                 panic("deextend: file too large");
  491 
  492         /*
  493          * Compute the number of clusters to allocate.
  494          */
  495         count = de_clcount(pmp, length) - de_clcount(pmp, dep->de_FileSize);
  496         if (count > 0) {
  497                 if (count > pmp->pm_freeclustercount)
  498                         return (ENOSPC);
  499                 error = extendfile(dep, count, NULL, NULL, DE_CLEAR);
  500                 if (error) {
  501                         /* truncate the added clusters away again */
  502                         (void) detrunc(dep, dep->de_FileSize, 0, cred);
  503                         return (error);
  504                 }
  505         }
  506         dep->de_FileSize = length;
  507         dep->de_flag |= DE_UPDATE | DE_MODIFIED;
  508         return (deupdat(dep, !DOINGASYNC(DETOV(dep))));
  509 }
  510 
  511 /*
  512  * Move a denode to its correct hash queue after the file it represents has
  513  * been moved to a new directory.
  514  */
  515 void
  516 reinsert(struct denode *dep)
  517 {
  518         struct vnode *vp;
  519 
  520         /*
  521          * Fix up the denode cache.  If the denode is for a directory,
  522          * there is nothing to do since the hash is based on the starting
  523          * cluster of the directory file and that hasn't changed.  If for a
  524          * file the hash is based on the location of the directory entry,
  525          * so we must remove it from the cache and re-enter it with the
  526          * hash based on the new location of the directory entry.
  527          */
  528 #if 0
  529         if (dep->de_Attributes & ATTR_DIRECTORY)
  530                 return;
  531 #endif
  532         vp = DETOV(dep);
  533         dep->de_inode = (uint64_t)dep->de_pmp->pm_bpcluster * dep->de_dirclust +
  534             dep->de_diroffset;
  535         vfs_hash_rehash(vp, dep->de_inode);
  536 }
  537 
  538 int
  539 msdosfs_reclaim(struct vop_reclaim_args *ap)
  540 {
  541         struct vnode *vp = ap->a_vp;
  542         struct denode *dep = VTODE(vp);
  543 
  544 #ifdef MSDOSFS_DEBUG
  545         printf("msdosfs_reclaim(): dep %p, file %s, refcnt %ld\n",
  546             dep, dep->de_Name, dep->de_refcnt);
  547 #endif
  548 
  549         /*
  550          * Destroy the vm object and flush associated pages.
  551          */
  552         vnode_destroy_vobject(vp);
  553         /*
  554          * Remove the denode from its hash chain.
  555          */
  556         vfs_hash_remove(vp);
  557         /*
  558          * Purge old data structures associated with the denode.
  559          */
  560 #if 0 /* XXX */
  561         dep->de_flag = 0;
  562 #endif
  563         free(dep, M_MSDOSFSNODE);
  564         vp->v_data = NULL;
  565 
  566         return (0);
  567 }
  568 
  569 int
  570 msdosfs_inactive(struct vop_inactive_args *ap)
  571 {
  572         struct vnode *vp = ap->a_vp;
  573         struct denode *dep = VTODE(vp);
  574         int error = 0;
  575 
  576 #ifdef MSDOSFS_DEBUG
  577         printf("msdosfs_inactive(): dep %p, de_Name[0] %x\n", dep, dep->de_Name[0]);
  578 #endif
  579 
  580         /*
  581          * Ignore denodes related to stale file handles.
  582          */
  583         if (dep->de_Name[0] == SLOT_DELETED || dep->de_Name[0] == SLOT_EMPTY)
  584                 goto out;
  585 
  586         /*
  587          * If the file has been deleted and it is on a read/write
  588          * filesystem, then truncate the file, and mark the directory slot
  589          * as empty.  (This may not be necessary for the dos filesystem.)
  590          */
  591 #ifdef MSDOSFS_DEBUG
  592         printf("msdosfs_inactive(): dep %p, refcnt %ld, mntflag %x, MNT_RDONLY %x\n",
  593                dep, dep->de_refcnt, vp->v_mount->mnt_flag, MNT_RDONLY);
  594 #endif
  595         if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
  596                 error = detrunc(dep, (u_long) 0, 0, NOCRED);
  597                 dep->de_flag |= DE_UPDATE;
  598                 dep->de_Name[0] = SLOT_DELETED;
  599         }
  600         deupdat(dep, 0);
  601 
  602 out:
  603         /*
  604          * If we are done with the denode, reclaim it
  605          * so that it can be reused immediately.
  606          */
  607 #ifdef MSDOSFS_DEBUG
  608         printf("msdosfs_inactive(): v_usecount %d, de_Name[0] %x\n",
  609                vrefcnt(vp), dep->de_Name[0]);
  610 #endif
  611         if (dep->de_Name[0] == SLOT_DELETED || dep->de_Name[0] == SLOT_EMPTY)
  612                 vrecycle(vp);
  613         return (error);
  614 }

Cache object: 89095cb41da0889f9d9b90ccfa321224


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