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/8.4/sys/fs/msdosfs/msdosfs_denode.c 229233 2012-01-01 23:17:21Z kib $ */
    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(pmp, dirclust, diroffset, depp)
   96         struct msdosfsmount *pmp;       /* so we know the maj/min number */
   97         u_long dirclust;                /* cluster this dir entry came from */
   98         u_long diroffset;               /* index of entry within the cluster */
   99         struct denode **depp;           /* returns the addr of the gotten denode */
  100 {
  101         int error;
  102         uint64_t inode;
  103         struct mount *mntp = pmp->pm_mountp;
  104         struct direntry *direntptr;
  105         struct denode *ldep;
  106         struct vnode *nvp, *xvp;
  107         struct buf *bp;
  108 
  109 #ifdef MSDOSFS_DEBUG
  110         printf("deget(pmp %p, dirclust %lu, diroffset %lx, depp %p)\n",
  111             pmp, dirclust, diroffset, depp);
  112 #endif
  113 
  114         /*
  115          * On FAT32 filesystems, root is a (more or less) normal
  116          * directory
  117          */
  118         if (FAT32(pmp) && dirclust == MSDOSFSROOT)
  119                 dirclust = pmp->pm_rootdirblk;
  120 
  121         /*
  122          * See if the denode is in the denode cache. Use the location of
  123          * the directory entry to compute the hash value. For subdir use
  124          * address of "." entry. For root dir (if not FAT32) use cluster
  125          * MSDOSFSROOT, offset MSDOSFSROOT_OFS
  126          *
  127          * NOTE: The check for de_refcnt > 0 below insures the denode being
  128          * examined does not represent an unlinked but still open file.
  129          * These files are not to be accessible even when the directory
  130          * entry that represented the file happens to be reused while the
  131          * deleted file is still open.
  132          */
  133         inode = (uint64_t)pmp->pm_bpcluster * dirclust + diroffset;
  134 
  135         error = vfs_hash_get(mntp, inode, LK_EXCLUSIVE, curthread, &nvp,
  136             de_vncmpf, &inode);
  137         if (error)
  138                 return (error);
  139         if (nvp != NULL) {
  140                 *depp = VTODE(nvp);
  141                 KASSERT((*depp)->de_dirclust == dirclust, ("wrong dirclust"));
  142                 KASSERT((*depp)->de_diroffset == diroffset, ("wrong diroffset"));
  143                 return (0);
  144         }
  145 
  146         /*
  147          * Do the malloc before the getnewvnode since doing so afterward
  148          * might cause a bogus v_data pointer to get dereferenced
  149          * elsewhere if malloc should block.
  150          */
  151         ldep = malloc(sizeof(struct denode), M_MSDOSFSNODE, M_WAITOK | M_ZERO);
  152 
  153         /*
  154          * Directory entry was not in cache, have to create a vnode and
  155          * copy it from the passed disk buffer.
  156          */
  157         /* getnewvnode() does a VREF() on the vnode */
  158         error = getnewvnode("msdosfs", mntp, &msdosfs_vnodeops, &nvp);
  159         if (error) {
  160                 *depp = NULL;
  161                 free(ldep, M_MSDOSFSNODE);
  162                 return error;
  163         }
  164         nvp->v_data = ldep;
  165         ldep->de_vnode = nvp;
  166         ldep->de_flag = 0;
  167         ldep->de_dirclust = dirclust;
  168         ldep->de_diroffset = diroffset;
  169         ldep->de_inode = inode;
  170         lockmgr(nvp->v_vnlock, LK_EXCLUSIVE, NULL);
  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, LK_EXCLUSIVE, 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 
  239                         vput(nvp);
  240                         *depp = NULL;
  241                         return (error);
  242                 }
  243                 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(dep, waitfor)
  294         struct denode *dep;
  295         int waitfor;
  296 {
  297         int error;
  298         struct buf *bp;
  299         struct direntry *dirp;
  300         struct timespec ts;
  301 
  302         if (DETOV(dep)->v_mount->mnt_flag & MNT_RDONLY)
  303                 return (0);
  304         getnanotime(&ts);
  305         DETIMES(dep, &ts, &ts, &ts);
  306         if ((dep->de_flag & DE_MODIFIED) == 0)
  307                 return (0);
  308         dep->de_flag &= ~DE_MODIFIED;
  309         if (dep->de_Attributes & ATTR_DIRECTORY)
  310                 return (0);
  311         if (dep->de_refcnt <= 0)
  312                 return (0);
  313         error = readde(dep, &bp, &dirp);
  314         if (error)
  315                 return (error);
  316         DE_EXTERNALIZE(dirp, dep);
  317         if (waitfor)
  318                 return (bwrite(bp));
  319         else {
  320                 bdwrite(bp);
  321                 return (0);
  322         }
  323 }
  324 
  325 /*
  326  * Truncate the file described by dep to the length specified by length.
  327  */
  328 int
  329 detrunc(dep, length, flags, cred, td)
  330         struct denode *dep;
  331         u_long length;
  332         int flags;
  333         struct ucred *cred;
  334         struct thread *td;
  335 {
  336         int error;
  337         int allerror;
  338         u_long eofentry;
  339         u_long chaintofree;
  340         daddr_t bn;
  341         int boff;
  342         int isadir = dep->de_Attributes & ATTR_DIRECTORY;
  343         struct buf *bp;
  344         struct msdosfsmount *pmp = dep->de_pmp;
  345 
  346 #ifdef MSDOSFS_DEBUG
  347         printf("detrunc(): file %s, length %lu, flags %x\n", dep->de_Name, length, flags);
  348 #endif
  349 
  350         /*
  351          * Disallow attempts to truncate the root directory since it is of
  352          * fixed size.  That's just the way dos filesystems are.  We use
  353          * the VROOT bit in the vnode because checking for the directory
  354          * bit and a startcluster of 0 in the denode is not adequate to
  355          * recognize the root directory at this point in a file or
  356          * directory's life.
  357          */
  358         if ((DETOV(dep)->v_vflag & VV_ROOT) && !FAT32(pmp)) {
  359 #ifdef MSDOSFS_DEBUG
  360                 printf("detrunc(): can't truncate root directory, clust %ld, offset %ld\n",
  361                     dep->de_dirclust, dep->de_diroffset);
  362 #endif
  363                 return (EINVAL);
  364         }
  365 
  366         if (dep->de_FileSize < length) {
  367                 vnode_pager_setsize(DETOV(dep), length);
  368                 return deextend(dep, length, cred);
  369         }
  370 
  371         /*
  372          * If the desired length is 0 then remember the starting cluster of
  373          * the file and set the StartCluster field in the directory entry
  374          * to 0.  If the desired length is not zero, then get the number of
  375          * the last cluster in the shortened file.  Then get the number of
  376          * the first cluster in the part of the file that is to be freed.
  377          * Then set the next cluster pointer in the last cluster of the
  378          * file to CLUST_EOFE.
  379          */
  380         if (length == 0) {
  381                 chaintofree = dep->de_StartCluster;
  382                 dep->de_StartCluster = 0;
  383                 eofentry = ~0;
  384         } else {
  385                 error = pcbmap(dep, de_clcount(pmp, length) - 1, 0, 
  386                                &eofentry, 0);
  387                 if (error) {
  388 #ifdef MSDOSFS_DEBUG
  389                         printf("detrunc(): pcbmap fails %d\n", error);
  390 #endif
  391                         return (error);
  392                 }
  393         }
  394 
  395         fc_purge(dep, de_clcount(pmp, length));
  396 
  397         /*
  398          * If the new length is not a multiple of the cluster size then we
  399          * must zero the tail end of the new last cluster in case it
  400          * becomes part of the file again because of a seek.
  401          */
  402         if ((boff = length & pmp->pm_crbomask) != 0) {
  403                 if (isadir) {
  404                         bn = cntobn(pmp, eofentry);
  405                         error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster,
  406                             NOCRED, &bp);
  407                         if (error) {
  408                                 brelse(bp);
  409 #ifdef MSDOSFS_DEBUG
  410                                 printf("detrunc(): bread fails %d\n", error);
  411 #endif
  412                                 return (error);
  413                         }
  414                         bzero(bp->b_data + boff, pmp->pm_bpcluster - boff);
  415                         if (flags & IO_SYNC)
  416                                 bwrite(bp);
  417                         else
  418                                 bdwrite(bp);
  419                 }
  420         }
  421 
  422         /*
  423          * Write out the updated directory entry.  Even if the update fails
  424          * we free the trailing clusters.
  425          */
  426         dep->de_FileSize = length;
  427         if (!isadir)
  428                 dep->de_flag |= DE_UPDATE | DE_MODIFIED;
  429         allerror = vtruncbuf(DETOV(dep), cred, td, length, pmp->pm_bpcluster);
  430 #ifdef MSDOSFS_DEBUG
  431         if (allerror)
  432                 printf("detrunc(): vtruncbuf error %d\n", allerror);
  433 #endif
  434         error = deupdat(dep, !(DETOV(dep)->v_mount->mnt_flag & MNT_ASYNC));
  435         if (error != 0 && allerror == 0)
  436                 allerror = error;
  437 #ifdef MSDOSFS_DEBUG
  438         printf("detrunc(): allerror %d, eofentry %lu\n",
  439                allerror, eofentry);
  440 #endif
  441 
  442         /*
  443          * If we need to break the cluster chain for the file then do it
  444          * now.
  445          */
  446         if (eofentry != ~0) {
  447                 error = fatentry(FAT_GET_AND_SET, pmp, eofentry,
  448                                  &chaintofree, CLUST_EOFE);
  449                 if (error) {
  450 #ifdef MSDOSFS_DEBUG
  451                         printf("detrunc(): fatentry errors %d\n", error);
  452 #endif
  453                         return (error);
  454                 }
  455                 fc_setcache(dep, FC_LASTFC, de_cluster(pmp, length - 1),
  456                             eofentry);
  457         }
  458 
  459         /*
  460          * Now free the clusters removed from the file because of the
  461          * truncation.
  462          */
  463         if (chaintofree != 0 && !MSDOSFSEOF(pmp, chaintofree))
  464                 freeclusterchain(pmp, chaintofree);
  465 
  466         return (allerror);
  467 }
  468 
  469 /*
  470  * Extend the file described by dep to length specified by length.
  471  */
  472 int
  473 deextend(dep, length, cred)
  474         struct denode *dep;
  475         u_long length;
  476         struct ucred *cred;
  477 {
  478         struct msdosfsmount *pmp = dep->de_pmp;
  479         u_long count;
  480         int error;
  481 
  482         /*
  483          * The root of a DOS filesystem cannot be extended.
  484          */
  485         if ((DETOV(dep)->v_vflag & VV_ROOT) && !FAT32(pmp))
  486                 return (EINVAL);
  487 
  488         /*
  489          * Directories cannot be extended.
  490          */
  491         if (dep->de_Attributes & ATTR_DIRECTORY)
  492                 return (EISDIR);
  493 
  494         if (length <= dep->de_FileSize)
  495                 panic("deextend: file too large");
  496 
  497         /*
  498          * Compute the number of clusters to allocate.
  499          */
  500         count = de_clcount(pmp, length) - de_clcount(pmp, dep->de_FileSize);
  501         if (count > 0) {
  502                 if (count > pmp->pm_freeclustercount)
  503                         return (ENOSPC);
  504                 error = extendfile(dep, count, NULL, NULL, DE_CLEAR);
  505                 if (error) {
  506                         /* truncate the added clusters away again */
  507                         (void) detrunc(dep, dep->de_FileSize, 0, cred, NULL);
  508                         return (error);
  509                 }
  510         }
  511         dep->de_FileSize = length;
  512         dep->de_flag |= DE_UPDATE | DE_MODIFIED;
  513         return (deupdat(dep, !(DETOV(dep)->v_mount->mnt_flag & MNT_ASYNC)));
  514 }
  515 
  516 /*
  517  * Move a denode to its correct hash queue after the file it represents has
  518  * been moved to a new directory.
  519  */
  520 void
  521 reinsert(dep)
  522         struct denode *dep;
  523 {
  524         struct vnode *vp;
  525 
  526         /*
  527          * Fix up the denode cache.  If the denode is for a directory,
  528          * there is nothing to do since the hash is based on the starting
  529          * cluster of the directory file and that hasn't changed.  If for a
  530          * file the hash is based on the location of the directory entry,
  531          * so we must remove it from the cache and re-enter it with the
  532          * hash based on the new location of the directory entry.
  533          */
  534 #if 0
  535         if (dep->de_Attributes & ATTR_DIRECTORY)
  536                 return;
  537 #endif
  538         vp = DETOV(dep);
  539         dep->de_inode = (uint64_t)dep->de_pmp->pm_bpcluster * dep->de_dirclust +
  540             dep->de_diroffset;
  541         vfs_hash_rehash(vp, dep->de_inode);
  542 }
  543 
  544 int
  545 msdosfs_reclaim(ap)
  546         struct vop_reclaim_args /* {
  547                 struct vnode *a_vp;
  548         } */ *ap;
  549 {
  550         struct vnode *vp = ap->a_vp;
  551         struct denode *dep = VTODE(vp);
  552 
  553 #ifdef MSDOSFS_DEBUG
  554         printf("msdosfs_reclaim(): dep %p, file %s, refcnt %ld\n",
  555             dep, dep->de_Name, dep->de_refcnt);
  556 #endif
  557 
  558         /*
  559          * Destroy the vm object and flush associated pages.
  560          */
  561         vnode_destroy_vobject(vp);
  562         /*
  563          * Remove the denode from its hash chain.
  564          */
  565         vfs_hash_remove(vp);
  566         /*
  567          * Purge old data structures associated with the denode.
  568          */
  569 #if 0 /* XXX */
  570         dep->de_flag = 0;
  571 #endif
  572         free(dep, M_MSDOSFSNODE);
  573         vp->v_data = NULL;
  574 
  575         return (0);
  576 }
  577 
  578 int
  579 msdosfs_inactive(ap)
  580         struct vop_inactive_args /* {
  581                 struct vnode *a_vp;
  582                 struct thread *a_td;
  583         } */ *ap;
  584 {
  585         struct vnode *vp = ap->a_vp;
  586         struct denode *dep = VTODE(vp);
  587         struct thread *td = ap->a_td;
  588         int error = 0;
  589 
  590 #ifdef MSDOSFS_DEBUG
  591         printf("msdosfs_inactive(): dep %p, de_Name[0] %x\n", dep, dep->de_Name[0]);
  592 #endif
  593 
  594         /*
  595          * Ignore denodes related to stale file handles.
  596          */
  597         if (dep->de_Name[0] == SLOT_DELETED || dep->de_Name[0] == SLOT_EMPTY)
  598                 goto out;
  599 
  600         /*
  601          * If the file has been deleted and it is on a read/write
  602          * filesystem, then truncate the file, and mark the directory slot
  603          * as empty.  (This may not be necessary for the dos filesystem.)
  604          */
  605 #ifdef MSDOSFS_DEBUG
  606         printf("msdosfs_inactive(): dep %p, refcnt %ld, mntflag %x, MNT_RDONLY %x\n",
  607                dep, dep->de_refcnt, vp->v_mount->mnt_flag, MNT_RDONLY);
  608 #endif
  609         if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
  610                 error = detrunc(dep, (u_long) 0, 0, NOCRED, td);
  611                 dep->de_flag |= DE_UPDATE;
  612                 dep->de_Name[0] = SLOT_DELETED;
  613         }
  614         deupdat(dep, 0);
  615 
  616 out:
  617         /*
  618          * If we are done with the denode, reclaim it
  619          * so that it can be reused immediately.
  620          */
  621 #ifdef MSDOSFS_DEBUG
  622         printf("msdosfs_inactive(): v_usecount %d, de_Name[0] %x\n",
  623                vrefcnt(vp), dep->de_Name[0]);
  624 #endif
  625         if (dep->de_Name[0] == SLOT_DELETED || dep->de_Name[0] == SLOT_EMPTY)
  626                 vrecycle(vp, td);
  627         return (error);
  628 }

Cache object: 8aaa5c135646a385d4214561aae328fc


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