sys/fs/msdosfs/msdosfs_denode.c

   1 /*      $NetBSD: msdosfs_denode.c,v 1.36 2009/03/15 17:15:57 cegger Exp $       */
   2
   3 /*-
   4  * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
   5  * Copyright (C) 1994, 1995, 1997 TooLs GmbH.
   6  * All rights reserved.
   7  * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below).
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. All advertising materials mentioning features or use of this software
  18  *    must display the following acknowledgement:
  19  *      This product includes software developed by TooLs GmbH.
  20  * 4. The name of TooLs GmbH may not be used to endorse or promote products
  21  *    derived from this software without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
  24  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  25  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  26  * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  27  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  28  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
  29  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  30  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  31  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  32  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34 /*
  35  * Written by Paul Popelka (paulp@uts.amdahl.com)
  36  *
  37  * You can do anything you want with this software, just don't say you wrote
  38  * it, and don't remove this notice.
  39  *
  40  * This software is provided "as is".
  41  *
  42  * The author supplies this software to be publicly redistributed on the
  43  * understanding that the author is not responsible for the correct
  44  * functioning of this software in any circumstances and is not liable for
  45  * any damages caused by this software.
  46  *
  47  * October 1992
  48  */
  49
  50 #include <sys/cdefs.h>
  51 __KERNEL_RCSID(0, "$NetBSD: msdosfs_denode.c,v 1.36 2009/03/15 17:15:57 cegger Exp $");
  52
  53 #include <sys/param.h>
  54 #include <sys/systm.h>
  55 #include <sys/mount.h>
  56 #include <sys/malloc.h>
  57 #include <sys/pool.h>
  58 #include <sys/proc.h>
  59 #include <sys/buf.h>
  60 #include <sys/vnode.h>
  61 #include <sys/kernel.h>         /* defines "time" */
  62 #include <sys/dirent.h>
  63 #include <sys/namei.h>
  64 #include <sys/kauth.h>
  65
  66 #include <uvm/uvm_extern.h>
  67
  68 #include <fs/msdosfs/bpb.h>
  69 #include <fs/msdosfs/msdosfsmount.h>
  70 #include <fs/msdosfs/direntry.h>
  71 #include <fs/msdosfs/denode.h>
  72 #include <fs/msdosfs/fat.h>
  73
  74 LIST_HEAD(ihashhead, denode) *dehashtbl;
  75 u_long dehash;                  /* size of hash table - 1 */
  76 #define DEHASH(dev, dcl, doff) \
  77     (((dev) + (dcl) + (doff) / sizeof(struct direntry)) & dehash)
  78
  79 kmutex_t msdosfs_ihash_lock;
  80 kmutex_t msdosfs_hashlock;
  81
  82 struct pool msdosfs_denode_pool;
  83
  84 extern int prtactive;
  85
  86 static const struct genfs_ops msdosfs_genfsops = {
  87         .gop_size = genfs_size,
  88         .gop_alloc = msdosfs_gop_alloc,
  89         .gop_write = genfs_gop_write,
  90         .gop_markupdate = msdosfs_gop_markupdate,
  91 };
  92
  93 static struct denode *msdosfs_hashget(dev_t, u_long, u_long, int);
  94 static void msdosfs_hashins(struct denode *);
  95 static void msdosfs_hashrem(struct denode *);
  96
  97 MALLOC_DECLARE(M_MSDOSFSFAT);
  98
  99 void
 100 msdosfs_init(void)
 101 {
 102
 103         malloc_type_attach(M_MSDOSFSMNT);
 104         malloc_type_attach(M_MSDOSFSFAT);
 105         malloc_type_attach(M_MSDOSFSTMP);
 106         pool_init(&msdosfs_denode_pool, sizeof(struct denode), 0, 0, 0,
 107             "msdosnopl", &pool_allocator_nointr, IPL_NONE);
 108         dehashtbl = hashinit(desiredvnodes / 2, HASH_LIST, true, &dehash);
 109         mutex_init(&msdosfs_ihash_lock, MUTEX_DEFAULT, IPL_NONE);
 110         mutex_init(&msdosfs_hashlock, MUTEX_DEFAULT, IPL_NONE);
 111 }
 112
 113 /*
 114  * Reinitialize inode hash table.
 115  */
 116
 117 void
 118 msdosfs_reinit(void)
 119 {
 120         struct denode *dep;
 121         struct ihashhead *oldhash, *hash;
 122         u_long oldmask, mask, val;
 123         int i;
 124
 125         hash = hashinit(desiredvnodes / 2, HASH_LIST, true, &mask);
 126
 127         mutex_enter(&msdosfs_ihash_lock);
 128         oldhash = dehashtbl;
 129         oldmask = dehash;
 130         dehashtbl = hash;
 131         dehash = mask;
 132         for (i = 0; i <= oldmask; i++) {
 133                 while ((dep = LIST_FIRST(&oldhash[i])) != NULL) {
 134                         LIST_REMOVE(dep, de_hash);
 135                         val = DEHASH(dep->de_dev, dep->de_dirclust,
 136                             dep->de_diroffset);
 137                         LIST_INSERT_HEAD(&hash[val], dep, de_hash);
 138                 }
 139         }
 140         mutex_exit(&msdosfs_ihash_lock);
 141         hashdone(oldhash, HASH_LIST, oldmask);
 142 }
 143
 144 void
 145 msdosfs_done(void)
 146 {
 147         hashdone(dehashtbl, HASH_LIST, dehash);
 148         pool_destroy(&msdosfs_denode_pool);
 149         mutex_destroy(&msdosfs_ihash_lock);
 150         mutex_destroy(&msdosfs_hashlock);
 151         malloc_type_detach(M_MSDOSFSTMP);
 152         malloc_type_detach(M_MSDOSFSFAT);
 153         malloc_type_detach(M_MSDOSFSMNT);
 154 }
 155
 156 static struct denode *
 157 msdosfs_hashget(dev_t dev, u_long dirclust, u_long diroff, int flags)
 158 {
 159         struct denode *dep;
 160         struct vnode *vp;
 161
 162 loop:
 163         mutex_enter(&msdosfs_ihash_lock);
 164         LIST_FOREACH(dep, &dehashtbl[DEHASH(dev, dirclust, diroff)], de_hash) {
 165                 if (dirclust == dep->de_dirclust &&
 166                     diroff == dep->de_diroffset &&
 167                     dev == dep->de_dev &&
 168                     dep->de_refcnt != 0) {
 169                         vp = DETOV(dep);
 170                         if (flags == 0) {
 171                                 mutex_exit(&msdosfs_ihash_lock);
 172                         } else {
 173                                 mutex_enter(&vp->v_interlock);
 174                                 mutex_exit(&msdosfs_ihash_lock);
 175                                 if (vget(vp, flags | LK_INTERLOCK))
 176                                         goto loop;
 177                         }
 178                         return (dep);
 179                 }
 180         }
 181         mutex_exit(&msdosfs_ihash_lock);
 182         return (NULL);
 183 }
 184
 185 static void
 186 msdosfs_hashins(struct denode *dep)
 187 {
 188         struct ihashhead *depp;
 189         int val;
 190
 191         KASSERT(mutex_owned(&msdosfs_hashlock));
 192
 193         mutex_enter(&msdosfs_ihash_lock);
 194         val = DEHASH(dep->de_dev, dep->de_dirclust, dep->de_diroffset);
 195         depp = &dehashtbl[val];
 196         LIST_INSERT_HEAD(depp, dep, de_hash);
 197         mutex_exit(&msdosfs_ihash_lock);
 198 }
 199
 200 static void
 201 msdosfs_hashrem(struct denode *dep)
 202 {
 203         mutex_enter(&msdosfs_ihash_lock);
 204         LIST_REMOVE(dep, de_hash);
 205         mutex_exit(&msdosfs_ihash_lock);
 206 }
 207
 208 /*
 209  * If deget() succeeds it returns with the gotten denode locked().
 210  *
 211  * pmp       - address of msdosfsmount structure of the filesystem containing
 212  *             the denode of interest.  The pm_dev field and the address of
 213  *             the msdosfsmount structure are used.
 214  * dirclust  - which cluster bp contains, if dirclust is 0 (root directory)
 215  *             diroffset is relative to the beginning of the root directory,
 216  *             otherwise it is cluster relative.
 217  * diroffset - offset past begin of cluster of denode we want
 218  * depp      - returns the address of the gotten denode.
 219  */
 220 int
 221 deget(struct msdosfsmount *pmp, u_long dirclust, u_long diroffset, struct denode **depp)
 222         /* pmp:  so we know the maj/min number */
 223         /* dirclust:             cluster this dir entry came from */
 224         /* diroffset:            index of entry within the cluster */
 225         /* depp:                 returns the addr of the gotten denode */
 226 {
 227         int error;
 228         extern int (**msdosfs_vnodeop_p)(void *);
 229         struct direntry *direntptr;
 230         struct denode *ldep;
 231         struct vnode *nvp;
 232         struct buf *bp;
 233
 234 #ifdef MSDOSFS_DEBUG
 235         printf("deget(pmp %p, dirclust %lu, diroffset %lx, depp %p)\n",
 236             pmp, dirclust, diroffset, depp);
 237 #endif
 238
 239         /*
 240          * On FAT32 filesystems, root is a (more or less) normal
 241          * directory
 242          */
 243         if (FAT32(pmp) && dirclust == MSDOSFSROOT)
 244                 dirclust = pmp->pm_rootdirblk;
 245
 246         /*
 247          * See if the denode is in the denode cache. Use the location of
 248          * the directory entry to compute the hash value. For subdir use
 249          * address of "." entry. For root dir (if not FAT32) use cluster
 250          * MSDOSFSROOT, offset MSDOSFSROOT_OFS
 251          *
 252          * NOTE: The check for de_refcnt > 0 below insures the denode being
 253          * examined does not represent an unlinked but still open file.
 254          * These files are not to be accessible even when the directory
 255          * entry that represented the file happens to be reused while the
 256          * deleted file is still open.
 257          */
 258  retry:
 259         ldep = msdosfs_hashget(pmp->pm_dev, dirclust, diroffset, LK_EXCLUSIVE);
 260         if (ldep) {
 261                 *depp = ldep;
 262                 return (0);
 263         }
 264
 265         /*
 266          * Directory entry was not in cache, have to create a vnode and
 267          * copy it from the passed disk buffer.
 268          */
 269         /* getnewvnode() does a VREF() on the vnode */
 270         error = getnewvnode(VT_MSDOSFS, pmp->pm_mountp,
 271                             msdosfs_vnodeop_p, &nvp);
 272         if (error) {
 273                 *depp = 0;
 274                 return (error);
 275         }
 276         ldep = pool_get(&msdosfs_denode_pool, PR_WAITOK);
 277
 278         /*
 279          * If someone beat us to it, put back the freshly allocated
 280          * vnode/inode pair and retry.
 281          */
 282         mutex_enter(&msdosfs_hashlock);
 283         if (msdosfs_hashget(pmp->pm_dev, dirclust, diroffset, 0)) {
 284                 mutex_exit(&msdosfs_hashlock);
 285                 ungetnewvnode(nvp);
 286                 pool_put(&msdosfs_denode_pool, ldep);
 287                 goto retry;
 288         }
 289         memset(ldep, 0, sizeof *ldep);
 290         nvp->v_data = ldep;
 291         ldep->de_vnode = nvp;
 292         ldep->de_flag = 0;
 293         ldep->de_devvp = 0;
 294         ldep->de_lockf = 0;
 295         ldep->de_dev = pmp->pm_dev;
 296         ldep->de_dirclust = dirclust;
 297         ldep->de_diroffset = diroffset;
 298         fc_purge(ldep, 0);      /* init the fat cache for this denode */
 299
 300         /*
 301          * Insert the denode into the hash queue and lock the denode so it
 302          * can't be accessed until we've read it in and have done what we
 303          * need to it.
 304          */
 305         vn_lock(nvp, LK_EXCLUSIVE | LK_RETRY);
 306         genfs_node_init(nvp, &msdosfs_genfsops);
 307         msdosfs_hashins(ldep);
 308         mutex_exit(&msdosfs_hashlock);
 309
 310         ldep->de_pmp = pmp;
 311         ldep->de_devvp = pmp->pm_devvp;
 312         ldep->de_refcnt = 1;
 313         /*
 314          * Copy the directory entry into the denode area of the vnode.
 315          */
 316         if ((dirclust == MSDOSFSROOT
 317              || (FAT32(pmp) && dirclust == pmp->pm_rootdirblk))
 318             && diroffset == MSDOSFSROOT_OFS) {
 319                 /*
 320                  * Directory entry for the root directory. There isn't one,
 321                  * so we manufacture one. We should probably rummage
 322                  * through the root directory and find a label entry (if it
 323                  * exists), and then use the time and date from that entry
 324                  * as the time and date for the root denode.
 325                  */
 326                 nvp->v_vflag |= VV_ROOT; /* should be further down XXX */
 327
 328                 ldep->de_Attributes = ATTR_DIRECTORY;
 329                 if (FAT32(pmp))
 330                         ldep->de_StartCluster = pmp->pm_rootdirblk;
 331                         /* de_FileSize will be filled in further down */
 332                 else {
 333                         ldep->de_StartCluster = MSDOSFSROOT;
 334                         ldep->de_FileSize = pmp->pm_rootdirsize * pmp->pm_BytesPerSec;
 335                 }
 336                 /*
 337                  * fill in time and date so that dos2unixtime() doesn't
 338                  * spit up when called from msdosfs_getattr() with root
 339                  * denode
 340                  */
 341                 ldep->de_CHun = 0;
 342                 ldep->de_CTime = 0x0000;        /* 00:00:00      */
 343                 ldep->de_CDate = (0 << DD_YEAR_SHIFT) | (1 << DD_MONTH_SHIFT)
 344                     | (1 << DD_DAY_SHIFT);
 345                 /* Jan 1, 1980   */
 346                 ldep->de_ADate = ldep->de_CDate;
 347                 ldep->de_MTime = ldep->de_CTime;
 348                 ldep->de_MDate = ldep->de_CDate;
 349                 /* leave the other fields as garbage */
 350         } else {
 351                 error = readep(pmp, dirclust, diroffset, &bp, &direntptr);
 352                 if (error) {
 353                         ldep->de_devvp = NULL;
 354                         ldep->de_Name[0] = SLOT_DELETED;
 355                         vput(nvp);
 356                         return (error);
 357                 }
 358                 DE_INTERNALIZE(ldep, direntptr);
 359                 brelse(bp, 0);
 360         }
 361
 362         /*
 363          * Fill in a few fields of the vnode and finish filling in the
 364          * denode.  Then return the address of the found denode.
 365          */
 366         if (ldep->de_Attributes & ATTR_DIRECTORY) {
 367                 /*
 368                  * Since DOS directory entries that describe directories
 369                  * have 0 in the filesize field, we take this opportunity
 370                  * to find out the length of the directory and plug it into
 371                  * the denode structure.
 372                  */
 373                 u_long size;
 374
 375                 nvp->v_type = VDIR;
 376                 if (ldep->de_StartCluster != MSDOSFSROOT) {
 377                         error = pcbmap(ldep, CLUST_END, 0, &size, 0);
 378                         if (error == E2BIG) {
 379                                 ldep->de_FileSize = de_cn2off(pmp, size);
 380                                 error = 0;
 381                         } else
 382                                 printf("deget(): pcbmap returned %d\n", error);
 383                 }
 384         } else
 385                 nvp->v_type = VREG;
 386         vref(ldep->de_devvp);
 387         *depp = ldep;
 388         uvm_vnp_setsize(nvp, ldep->de_FileSize);
 389         return (0);
 390 }
 391
 392 int
 393 deupdat(struct denode *dep, int waitfor)
 394 {
 395
 396         return (msdosfs_update(DETOV(dep), NULL, NULL,
 397             waitfor ? UPDATE_WAIT : 0));
 398 }
 399
 400 /*
 401  * Truncate the file described by dep to the length specified by length.
 402  */
 403 int
 404 detrunc(struct denode *dep, u_long length, int flags, kauth_cred_t cred)
 405 {
 406         int error;
 407         int allerror;
 408         u_long eofentry;
 409         u_long chaintofree = 0;
 410         daddr_t bn, lastblock;
 411         int boff;
 412         int isadir = dep->de_Attributes & ATTR_DIRECTORY;
 413         struct buf *bp;
 414         struct msdosfsmount *pmp = dep->de_pmp;
 415
 416 #ifdef MSDOSFS_DEBUG
 417         printf("detrunc(): file %s, length %lu, flags %x\n", dep->de_Name, length, flags);
 418 #endif
 419
 420         /*
 421          * Disallow attempts to truncate the root directory since it is of
 422          * fixed size.  That's just the way dos filesystems are.  We use
 423          * the VROOT bit in the vnode because checking for the directory
 424          * bit and a startcluster of 0 in the denode is not adequate to
 425          * recognize the root directory at this point in a file or
 426          * directory's life.
 427          */
 428         if ((DETOV(dep)->v_vflag & VV_ROOT) && !FAT32(pmp)) {
 429                 printf("detrunc(): can't truncate root directory, clust %ld, offset %ld\n",
 430                     dep->de_dirclust, dep->de_diroffset);
 431                 return (EINVAL);
 432         }
 433
 434         uvm_vnp_setsize(DETOV(dep), length);
 435
 436         if (dep->de_FileSize < length)
 437                 return (deextend(dep, length, cred));
 438         lastblock = de_clcount(pmp, length) - 1;
 439
 440         /*
 441          * If the desired length is 0 then remember the starting cluster of
 442          * the file and set the StartCluster field in the directory entry
 443          * to 0.  If the desired length is not zero, then get the number of
 444          * the last cluster in the shortened file.  Then get the number of
 445          * the first cluster in the part of the file that is to be freed.
 446          * Then set the next cluster pointer in the last cluster of the
 447          * file to CLUST_EOFE.
 448          */
 449         if (length == 0) {
 450                 chaintofree = dep->de_StartCluster;
 451                 dep->de_StartCluster = 0;
 452                 eofentry = ~0;
 453         } else {
 454                 error = pcbmap(dep, lastblock, 0, &eofentry, 0);
 455                 if (error) {
 456 #ifdef MSDOSFS_DEBUG
 457                         printf("detrunc(): pcbmap fails %d\n", error);
 458 #endif
 459                         return (error);
 460                 }
 461         }
 462
 463         fc_purge(dep, lastblock + 1);
 464
 465         /*
 466          * If the new length is not a multiple of the cluster size then we
 467          * must zero the tail end of the new last cluster in case it
 468          * becomes part of the file again because of a seek.
 469          */
 470         if ((boff = length & pmp->pm_crbomask) != 0) {
 471                 if (isadir) {
 472                         bn = cntobn(pmp, eofentry);
 473                         error = bread(pmp->pm_devvp, de_bn2kb(pmp, bn),
 474                             pmp->pm_bpcluster, NOCRED, B_MODIFY, &bp);
 475                         if (error) {
 476                                 brelse(bp, 0);
 477 #ifdef MSDOSFS_DEBUG
 478                                 printf("detrunc(): bread fails %d\n", error);
 479 #endif
 480                                 return (error);
 481                         }
 482                         memset((char *)bp->b_data + boff, 0,
 483                             pmp->pm_bpcluster - boff);
 484                         if (flags & IO_SYNC)
 485                                 bwrite(bp);
 486                         else
 487                                 bdwrite(bp);
 488                 } else {
 489                         uvm_vnp_zerorange(DETOV(dep), length,
 490                                           pmp->pm_bpcluster - boff);
 491                 }
 492         }
 493
 494         /*
 495          * Write out the updated directory entry.  Even if the update fails
 496          * we free the trailing clusters.
 497          */
 498         dep->de_FileSize = length;
 499         if (!isadir)
 500                 dep->de_flag |= DE_UPDATE|DE_MODIFIED;
 501         vtruncbuf(DETOV(dep), lastblock + 1, 0, 0);
 502         allerror = deupdat(dep, 1);
 503 #ifdef MSDOSFS_DEBUG
 504         printf("detrunc(): allerror %d, eofentry %lu\n",
 505                allerror, eofentry);
 506 #endif
 507
 508         /*
 509          * If we need to break the cluster chain for the file then do it
 510          * now.
 511          */
 512         if (eofentry != ~0) {
 513                 error = fatentry(FAT_GET_AND_SET, pmp, eofentry,
 514                                  &chaintofree, CLUST_EOFE);
 515                 if (error) {
 516 #ifdef MSDOSFS_DEBUG
 517                         printf("detrunc(): fatentry errors %d\n", error);
 518 #endif
 519                         return (error);
 520                 }
 521                 fc_setcache(dep, FC_LASTFC, de_cluster(pmp, length - 1),
 522                             eofentry);
 523         }
 524
 525         /*
 526          * Now free the clusters removed from the file because of the
 527          * truncation.
 528          */
 529         if (chaintofree != 0 && !MSDOSFSEOF(chaintofree, pmp->pm_fatmask))
 530                 freeclusterchain(pmp, chaintofree);
 531
 532         return (allerror);
 533 }
 534
 535 /*
 536  * Extend the file described by dep to length specified by length.
 537  */
 538 int
 539 deextend(struct denode *dep, u_long length, kauth_cred_t cred)
 540 {
 541         struct msdosfsmount *pmp = dep->de_pmp;
 542         u_long count, osize;
 543         int error;
 544
 545         /*
 546          * The root of a DOS filesystem cannot be extended.
 547          */
 548         if ((DETOV(dep)->v_vflag & VV_ROOT) && !FAT32(pmp))
 549                 return (EINVAL);
 550
 551         /*
 552          * Directories cannot be extended.
 553          */
 554         if (dep->de_Attributes & ATTR_DIRECTORY)
 555                 return (EISDIR);
 556
 557         if (length <= dep->de_FileSize)
 558                 panic("deextend: file too large");
 559
 560         /*
 561          * Compute the number of clusters to allocate.
 562          */
 563         count = de_clcount(pmp, length) - de_clcount(pmp, dep->de_FileSize);
 564         if (count > 0) {
 565                 if (count > pmp->pm_freeclustercount)
 566                         return (ENOSPC);
 567                 error = extendfile(dep, count, NULL, NULL, DE_CLEAR);
 568                 if (error) {
 569                         /* truncate the added clusters away again */
 570                         (void) detrunc(dep, dep->de_FileSize, 0, cred);
 571                         return (error);
 572                 }
 573         }
 574
 575         /*
 576          * Zero extend file range; uvm_vnp_zerorange() uses ubc_alloc() and a
 577          * memset(); we set the write size so ubc won't read in file data that
 578          * is zero'd later.
 579          */
 580         osize = dep->de_FileSize;
 581         dep->de_FileSize = length;
 582         uvm_vnp_setwritesize(DETOV(dep), (voff_t)dep->de_FileSize);
 583         dep->de_flag |= DE_UPDATE|DE_MODIFIED;
 584         uvm_vnp_zerorange(DETOV(dep), (off_t)osize,
 585             (size_t)(dep->de_FileSize - osize));
 586         uvm_vnp_setsize(DETOV(dep), (voff_t)dep->de_FileSize);
 587         return (deupdat(dep, 1));
 588 }
 589
 590 /*
 591  * Move a denode to its correct hash queue after the file it represents has
 592  * been moved to a new directory.
 593  */
 594 void
 595 reinsert(struct denode *dep)
 596 {
 597         /*
 598          * Fix up the denode cache.  If the denode is for a directory,
 599          * there is nothing to do since the hash is based on the starting
 600          * cluster of the directory file and that hasn't changed.  If for a
 601          * file the hash is based on the location of the directory entry,
 602          * so we must remove it from the cache and re-enter it with the
 603          * hash based on the new location of the directory entry.
 604          */
 605         if (dep->de_Attributes & ATTR_DIRECTORY)
 606                 return;
 607         mutex_enter(&msdosfs_hashlock);
 608         msdosfs_hashrem(dep);
 609         msdosfs_hashins(dep);
 610         mutex_exit(&msdosfs_hashlock);
 611 }
 612
 613 int
 614 msdosfs_reclaim(void *v)
 615 {
 616         struct vop_reclaim_args /* {
 617                 struct vnode *a_vp;
 618         } */ *ap = v;
 619         struct vnode *vp = ap->a_vp;
 620         struct denode *dep = VTODE(vp);
 621
 622 #ifdef MSDOSFS_DEBUG
 623         printf("msdosfs_reclaim(): dep %p, file %s, refcnt %ld\n",
 624             dep, dep->de_Name, dep->de_refcnt);
 625 #endif
 626
 627         if (prtactive && vp->v_usecount > 1)
 628                 vprint("msdosfs_reclaim(): pushing active", vp);
 629         /*
 630          * Remove the denode from its hash chain.
 631          */
 632         msdosfs_hashrem(dep);
 633         /*
 634          * Purge old data structures associated with the denode.
 635          */
 636         cache_purge(vp);
 637         if (dep->de_devvp) {
 638                 vrele(dep->de_devvp);
 639                 dep->de_devvp = 0;
 640         }
 641 #if 0 /* XXX */
 642         dep->de_flag = 0;
 643 #endif
 644         genfs_node_destroy(vp);
 645         pool_put(&msdosfs_denode_pool, dep);
 646         vp->v_data = NULL;
 647         return (0);
 648 }
 649
 650 int
 651 msdosfs_inactive(void *v)
 652 {
 653         struct vop_inactive_args /* {
 654                 struct vnode *a_vp;
 655                 bool *a_recycle;
 656         } */ *ap = v;
 657         struct vnode *vp = ap->a_vp;
 658         struct denode *dep = VTODE(vp);
 659         int error = 0;
 660
 661 #ifdef MSDOSFS_DEBUG
 662         printf("msdosfs_inactive(): dep %p, de_Name[0] %x\n", dep, dep->de_Name[0]);
 663 #endif
 664
 665         /*
 666          * Get rid of denodes related to stale file handles.
 667          */
 668         if (dep->de_Name[0] == SLOT_DELETED)
 669                 goto out;
 670
 671         /*
 672          * If the file has been deleted and it is on a read/write
 673          * filesystem, then truncate the file, and mark the directory slot
 674          * as empty.  (This may not be necessary for the dos filesystem.)
 675          */
 676 #ifdef MSDOSFS_DEBUG
 677         printf("msdosfs_inactive(): dep %p, refcnt %ld, mntflag %x %s\n",
 678                dep, dep->de_refcnt, vp->v_mount->mnt_flag,
 679                 (vp->v_mount->mnt_flag & MNT_RDONLY) ? "MNT_RDONLY" : "");
 680 #endif
 681         if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
 682                 if (dep->de_FileSize != 0) {
 683                         error = detrunc(dep, (u_long)0, 0, NOCRED);
 684                 }
 685                 dep->de_Name[0] = SLOT_DELETED;
 686         }
 687         deupdat(dep, 0);
 688 out:
 689         /*
 690          * If we are done with the denode, reclaim it
 691          * so that it can be reused immediately.
 692          */
 693 #ifdef MSDOSFS_DEBUG
 694         printf("msdosfs_inactive(): v_usecount %d, de_Name[0] %x\n",
 695                 vp->v_usecount, dep->de_Name[0]);
 696 #endif
 697         *ap->a_recycle = (dep->de_Name[0] == SLOT_DELETED);
 698         VOP_UNLOCK(vp, 0);
 699         return (error);
 700 }
 701
 702 int
 703 msdosfs_gop_alloc(struct vnode *vp, off_t off,
 704     off_t len, int flags, kauth_cred_t cred)
 705 {
 706         return 0;
 707 }
 708
 709 void
 710 msdosfs_gop_markupdate(struct vnode *vp, int flags)
 711 {
 712         u_long mask = 0;
 713
 714         if ((flags & GOP_UPDATE_ACCESSED) != 0) {
 715                 mask = DE_ACCESS;
 716         }
 717         if ((flags & GOP_UPDATE_MODIFIED) != 0) {
 718                 mask |= DE_UPDATE;
 719         }
 720         if (mask) {
 721                 struct denode *dep = VTODE(vp);
 722
 723                 dep->de_flag |= mask;
 724         }
 725 }