1 /* $FreeBSD$ */ 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/kernel.h> 54 #include <sys/mount.h> 55 #include <sys/malloc.h> 56 #include <sys/proc.h> 57 #include <sys/bio.h> 58 #include <sys/buf.h> 59 #include <sys/vnode.h> 60 61 #include <vm/vm.h> 62 #include <vm/vm_extern.h> 63 64 #include <msdosfs/bpb.h> 65 #include <msdosfs/msdosfsmount.h> 66 #include <msdosfs/direntry.h> 67 #include <msdosfs/denode.h> 68 #include <msdosfs/fat.h> 69 70 static MALLOC_DEFINE(M_MSDOSFSNODE, "MSDOSFS node", "MSDOSFS vnode private part"); 71 72 static struct denode **dehashtbl; 73 static u_long dehash; /* size of hash table - 1 */ 74 #define DEHASH(dev, dcl, doff) (dehashtbl[(minor(dev) + (dcl) + (doff) / \ 75 sizeof(struct direntry)) & dehash]) 76 #ifndef NULL_SIMPLELOCKS 77 static struct simplelock dehash_slock; 78 #endif 79 80 union _qcvt { 81 quad_t qcvt; 82 long val[2]; 83 }; 84 #define SETHIGH(q, h) { \ 85 union _qcvt tmp; \ 86 tmp.qcvt = (q); \ 87 tmp.val[_QUAD_HIGHWORD] = (h); \ 88 (q) = tmp.qcvt; \ 89 } 90 #define SETLOW(q, l) { \ 91 union _qcvt tmp; \ 92 tmp.qcvt = (q); \ 93 tmp.val[_QUAD_LOWWORD] = (l); \ 94 (q) = tmp.qcvt; \ 95 } 96 97 static struct denode * 98 msdosfs_hashget __P((dev_t dev, u_long dirclust, 99 u_long diroff)); 100 static void msdosfs_hashins __P((struct denode *dep)); 101 static void msdosfs_hashrem __P((struct denode *dep)); 102 103 /*ARGSUSED*/ 104 int 105 msdosfs_init(vfsp) 106 struct vfsconf *vfsp; 107 { 108 dehashtbl = hashinit(desiredvnodes/2, M_MSDOSFSMNT, &dehash); 109 simple_lock_init(&dehash_slock); 110 return (0); 111 } 112 113 int 114 msdosfs_uninit(vfsp) 115 struct vfsconf *vfsp; 116 { 117 118 if (dehashtbl) 119 free(dehashtbl, M_MSDOSFSMNT); 120 return (0); 121 } 122 123 static struct denode * 124 msdosfs_hashget(dev, dirclust, diroff) 125 dev_t dev; 126 u_long dirclust; 127 u_long diroff; 128 { 129 struct proc *p = curproc; /* XXX */ 130 struct denode *dep; 131 struct vnode *vp; 132 133 loop: 134 simple_lock(&dehash_slock); 135 for (dep = DEHASH(dev, dirclust, diroff); dep; dep = dep->de_next) { 136 if (dirclust == dep->de_dirclust 137 && diroff == dep->de_diroffset 138 && dev == dep->de_dev 139 && dep->de_refcnt != 0) { 140 vp = DETOV(dep); 141 simple_lock(&vp->v_interlock); 142 simple_unlock(&dehash_slock); 143 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, p)) 144 goto loop; 145 return (dep); 146 } 147 } 148 simple_unlock(&dehash_slock); 149 return (NULL); 150 } 151 152 static void 153 msdosfs_hashins(dep) 154 struct denode *dep; 155 { 156 struct denode **depp, *deq; 157 158 simple_lock(&dehash_slock); 159 depp = &DEHASH(dep->de_dev, dep->de_dirclust, dep->de_diroffset); 160 deq = *depp; 161 if (deq) 162 deq->de_prev = &dep->de_next; 163 dep->de_next = deq; 164 dep->de_prev = depp; 165 *depp = dep; 166 simple_unlock(&dehash_slock); 167 } 168 169 static void 170 msdosfs_hashrem(dep) 171 struct denode *dep; 172 { 173 struct denode *deq; 174 175 simple_lock(&dehash_slock); 176 deq = dep->de_next; 177 if (deq) 178 deq->de_prev = dep->de_prev; 179 *dep->de_prev = deq; 180 #ifdef DIAGNOSTIC 181 dep->de_next = NULL; 182 dep->de_prev = NULL; 183 #endif 184 simple_unlock(&dehash_slock); 185 } 186 187 /* 188 * If deget() succeeds it returns with the gotten denode locked(). 189 * 190 * pmp - address of msdosfsmount structure of the filesystem containing 191 * the denode of interest. The pm_dev field and the address of 192 * the msdosfsmount structure are used. 193 * dirclust - which cluster bp contains, if dirclust is 0 (root directory) 194 * diroffset is relative to the beginning of the root directory, 195 * otherwise it is cluster relative. 196 * diroffset - offset past begin of cluster of denode we want 197 * depp - returns the address of the gotten denode. 198 */ 199 int 200 deget(pmp, dirclust, diroffset, depp) 201 struct msdosfsmount *pmp; /* so we know the maj/min number */ 202 u_long dirclust; /* cluster this dir entry came from */ 203 u_long diroffset; /* index of entry within the cluster */ 204 struct denode **depp; /* returns the addr of the gotten denode */ 205 { 206 int error; 207 dev_t dev = pmp->pm_dev; 208 struct mount *mntp = pmp->pm_mountp; 209 struct direntry *direntptr; 210 struct denode *ldep; 211 struct vnode *nvp; 212 struct buf *bp; 213 struct proc *p = curproc; /* XXX */ 214 struct timeval tv; 215 216 #ifdef MSDOSFS_DEBUG 217 printf("deget(pmp %p, dirclust %lu, diroffset %lx, depp %p)\n", 218 pmp, dirclust, diroffset, depp); 219 #endif 220 221 /* 222 * On FAT32 filesystems, root is a (more or less) normal 223 * directory 224 */ 225 if (FAT32(pmp) && dirclust == MSDOSFSROOT) 226 dirclust = pmp->pm_rootdirblk; 227 228 /* 229 * See if the denode is in the denode cache. Use the location of 230 * the directory entry to compute the hash value. For subdir use 231 * address of "." entry. For root dir (if not FAT32) use cluster 232 * MSDOSFSROOT, offset MSDOSFSROOT_OFS 233 * 234 * NOTE: The check for de_refcnt > 0 below insures the denode being 235 * examined does not represent an unlinked but still open file. 236 * These files are not to be accessible even when the directory 237 * entry that represented the file happens to be reused while the 238 * deleted file is still open. 239 */ 240 ldep = msdosfs_hashget(dev, dirclust, diroffset); 241 if (ldep) { 242 *depp = ldep; 243 return (0); 244 } 245 246 /* 247 * Do the MALLOC before the getnewvnode since doing so afterward 248 * might cause a bogus v_data pointer to get dereferenced 249 * elsewhere if MALLOC should block. 250 */ 251 MALLOC(ldep, struct denode *, sizeof(struct denode), M_MSDOSFSNODE, M_WAITOK); 252 253 /* 254 * Directory entry was not in cache, have to create a vnode and 255 * copy it from the passed disk buffer. 256 */ 257 /* getnewvnode() does a VREF() on the vnode */ 258 error = getnewvnode(VT_MSDOSFS, mntp, msdosfs_vnodeop_p, &nvp); 259 if (error) { 260 *depp = NULL; 261 FREE(ldep, M_MSDOSFSNODE); 262 return error; 263 } 264 bzero((caddr_t)ldep, sizeof *ldep); 265 lockinit(&ldep->de_lock, PINOD, "denode", 0, 0); 266 nvp->v_data = ldep; 267 ldep->de_vnode = nvp; 268 ldep->de_flag = 0; 269 ldep->de_devvp = 0; 270 ldep->de_dev = dev; 271 ldep->de_dirclust = dirclust; 272 ldep->de_diroffset = diroffset; 273 fc_purge(ldep, 0); /* init the fat cache for this denode */ 274 275 /* 276 * Lock the denode so that it can't be accessed until we've read 277 * it in and have done what we need to it. Do this here instead 278 * of at the start of msdosfs_hashins() so that reinsert() can 279 * call msdosfs_hashins() with a locked denode. 280 */ 281 if (lockmgr(&ldep->de_lock, LK_EXCLUSIVE, (struct simplelock *)0, p)) 282 panic("deget: unexpected lock failure"); 283 284 /* 285 * Insert the denode into the hash queue. 286 */ 287 msdosfs_hashins(ldep); 288 289 ldep->de_pmp = pmp; 290 ldep->de_refcnt = 1; 291 /* 292 * Copy the directory entry into the denode area of the vnode. 293 */ 294 if ((dirclust == MSDOSFSROOT 295 || (FAT32(pmp) && dirclust == pmp->pm_rootdirblk)) 296 && diroffset == MSDOSFSROOT_OFS) { 297 /* 298 * Directory entry for the root directory. There isn't one, 299 * so we manufacture one. We should probably rummage 300 * through the root directory and find a label entry (if it 301 * exists), and then use the time and date from that entry 302 * as the time and date for the root denode. 303 */ 304 nvp->v_flag |= VROOT; /* should be further down XXX */ 305 306 ldep->de_Attributes = ATTR_DIRECTORY; 307 ldep->de_LowerCase = 0; 308 if (FAT32(pmp)) 309 ldep->de_StartCluster = pmp->pm_rootdirblk; 310 /* de_FileSize will be filled in further down */ 311 else { 312 ldep->de_StartCluster = MSDOSFSROOT; 313 ldep->de_FileSize = pmp->pm_rootdirsize * DEV_BSIZE; 314 } 315 /* 316 * fill in time and date so that dos2unixtime() doesn't 317 * spit up when called from msdosfs_getattr() with root 318 * denode 319 */ 320 ldep->de_CHun = 0; 321 ldep->de_CTime = 0x0000; /* 00:00:00 */ 322 ldep->de_CDate = (0 << DD_YEAR_SHIFT) | (1 << DD_MONTH_SHIFT) 323 | (1 << DD_DAY_SHIFT); 324 /* Jan 1, 1980 */ 325 ldep->de_ADate = ldep->de_CDate; 326 ldep->de_MTime = ldep->de_CTime; 327 ldep->de_MDate = ldep->de_CDate; 328 /* leave the other fields as garbage */ 329 } else { 330 error = readep(pmp, dirclust, diroffset, &bp, &direntptr); 331 if (error) { 332 /* 333 * The denode does not contain anything useful, so 334 * it would be wrong to leave it on its hash chain. 335 * Arrange for vput() to just forget about it. 336 */ 337 ldep->de_Name[0] = SLOT_DELETED; 338 339 vput(nvp); 340 *depp = NULL; 341 return (error); 342 } 343 DE_INTERNALIZE(ldep, direntptr); 344 brelse(bp); 345 } 346 347 /* 348 * Fill in a few fields of the vnode and finish filling in the 349 * denode. Then return the address of the found denode. 350 */ 351 if (ldep->de_Attributes & ATTR_DIRECTORY) { 352 /* 353 * Since DOS directory entries that describe directories 354 * have 0 in the filesize field, we take this opportunity 355 * to find out the length of the directory and plug it into 356 * the denode structure. 357 */ 358 u_long size; 359 360 nvp->v_type = VDIR; 361 if (ldep->de_StartCluster != MSDOSFSROOT) { 362 error = pcbmap(ldep, 0xffff, 0, &size, 0); 363 if (error == E2BIG) { 364 ldep->de_FileSize = de_cn2off(pmp, size); 365 error = 0; 366 } else 367 printf("deget(): pcbmap returned %d\n", error); 368 } 369 } else 370 nvp->v_type = VREG; 371 getmicrouptime(&tv); 372 SETHIGH(ldep->de_modrev, tv.tv_sec); 373 SETLOW(ldep->de_modrev, tv.tv_usec * 4294); 374 ldep->de_devvp = pmp->pm_devvp; 375 VREF(ldep->de_devvp); 376 *depp = ldep; 377 return (0); 378 } 379 380 int 381 deupdat(dep, waitfor) 382 struct denode *dep; 383 int waitfor; 384 { 385 int error; 386 struct buf *bp; 387 struct direntry *dirp; 388 struct timespec ts; 389 390 if (DETOV(dep)->v_mount->mnt_flag & MNT_RDONLY) 391 return (0); 392 getnanotime(&ts); 393 DETIMES(dep, &ts, &ts, &ts); 394 if ((dep->de_flag & DE_MODIFIED) == 0) 395 return (0); 396 dep->de_flag &= ~DE_MODIFIED; 397 if (dep->de_Attributes & ATTR_DIRECTORY) 398 return (0); 399 if (dep->de_refcnt <= 0) 400 return (0); 401 error = readde(dep, &bp, &dirp); 402 if (error) 403 return (error); 404 DE_EXTERNALIZE(dirp, dep); 405 if (waitfor) 406 return (bwrite(bp)); 407 else { 408 bdwrite(bp); 409 return (0); 410 } 411 } 412 413 /* 414 * Truncate the file described by dep to the length specified by length. 415 */ 416 int 417 detrunc(dep, length, flags, cred, p) 418 struct denode *dep; 419 u_long length; 420 int flags; 421 struct ucred *cred; 422 struct proc *p; 423 { 424 int error; 425 int allerror; 426 u_long eofentry; 427 u_long chaintofree; 428 daddr_t bn; 429 int boff; 430 int isadir = dep->de_Attributes & ATTR_DIRECTORY; 431 struct buf *bp; 432 struct msdosfsmount *pmp = dep->de_pmp; 433 434 #ifdef MSDOSFS_DEBUG 435 printf("detrunc(): file %s, length %lu, flags %x\n", dep->de_Name, length, flags); 436 #endif 437 438 /* 439 * Disallow attempts to truncate the root directory since it is of 440 * fixed size. That's just the way dos filesystems are. We use 441 * the VROOT bit in the vnode because checking for the directory 442 * bit and a startcluster of 0 in the denode is not adequate to 443 * recognize the root directory at this point in a file or 444 * directory's life. 445 */ 446 if ((DETOV(dep)->v_flag & VROOT) && !FAT32(pmp)) { 447 printf("detrunc(): can't truncate root directory, clust %ld, offset %ld\n", 448 dep->de_dirclust, dep->de_diroffset); 449 return (EINVAL); 450 } 451 452 453 if (dep->de_FileSize < length) { 454 vnode_pager_setsize(DETOV(dep), length); 455 return deextend(dep, length, cred); 456 } 457 458 /* 459 * If the desired length is 0 then remember the starting cluster of 460 * the file and set the StartCluster field in the directory entry 461 * to 0. If the desired length is not zero, then get the number of 462 * the last cluster in the shortened file. Then get the number of 463 * the first cluster in the part of the file that is to be freed. 464 * Then set the next cluster pointer in the last cluster of the 465 * file to CLUST_EOFE. 466 */ 467 if (length == 0) { 468 chaintofree = dep->de_StartCluster; 469 dep->de_StartCluster = 0; 470 eofentry = ~0; 471 } else { 472 error = pcbmap(dep, de_clcount(pmp, length) - 1, 0, 473 &eofentry, 0); 474 if (error) { 475 #ifdef MSDOSFS_DEBUG 476 printf("detrunc(): pcbmap fails %d\n", error); 477 #endif 478 return (error); 479 } 480 } 481 482 fc_purge(dep, de_clcount(pmp, length)); 483 484 /* 485 * If the new length is not a multiple of the cluster size then we 486 * must zero the tail end of the new last cluster in case it 487 * becomes part of the file again because of a seek. 488 */ 489 if ((boff = length & pmp->pm_crbomask) != 0) { 490 if (isadir) { 491 bn = cntobn(pmp, eofentry); 492 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, 493 NOCRED, &bp); 494 } else { 495 bn = de_blk(pmp, length); 496 error = bread(DETOV(dep), bn, pmp->pm_bpcluster, 497 NOCRED, &bp); 498 } 499 if (error) { 500 brelse(bp); 501 #ifdef MSDOSFS_DEBUG 502 printf("detrunc(): bread fails %d\n", error); 503 #endif 504 return (error); 505 } 506 /* 507 * is this the right place for it? 508 */ 509 bzero(bp->b_data + boff, pmp->pm_bpcluster - boff); 510 if (flags & IO_SYNC) 511 bwrite(bp); 512 else 513 bdwrite(bp); 514 } 515 516 /* 517 * Write out the updated directory entry. Even if the update fails 518 * we free the trailing clusters. 519 */ 520 dep->de_FileSize = length; 521 if (!isadir) 522 dep->de_flag |= DE_UPDATE|DE_MODIFIED; 523 allerror = vtruncbuf(DETOV(dep), cred, p, length, pmp->pm_bpcluster); 524 #ifdef MSDOSFS_DEBUG 525 if (allerror) 526 printf("detrunc(): vtruncbuf error %d\n", allerror); 527 #endif 528 error = deupdat(dep, 1); 529 if (error && (allerror == 0)) 530 allerror = error; 531 #ifdef MSDOSFS_DEBUG 532 printf("detrunc(): allerror %d, eofentry %lu\n", 533 allerror, eofentry); 534 #endif 535 536 /* 537 * If we need to break the cluster chain for the file then do it 538 * now. 539 */ 540 if (eofentry != ~0) { 541 error = fatentry(FAT_GET_AND_SET, pmp, eofentry, 542 &chaintofree, CLUST_EOFE); 543 if (error) { 544 #ifdef MSDOSFS_DEBUG 545 printf("detrunc(): fatentry errors %d\n", error); 546 #endif 547 return (error); 548 } 549 fc_setcache(dep, FC_LASTFC, de_cluster(pmp, length - 1), 550 eofentry); 551 } 552 553 /* 554 * Now free the clusters removed from the file because of the 555 * truncation. 556 */ 557 if (chaintofree != 0 && !MSDOSFSEOF(pmp, chaintofree)) 558 freeclusterchain(pmp, chaintofree); 559 560 return (allerror); 561 } 562 563 /* 564 * Extend the file described by dep to length specified by length. 565 */ 566 int 567 deextend(dep, length, cred) 568 struct denode *dep; 569 u_long length; 570 struct ucred *cred; 571 { 572 struct msdosfsmount *pmp = dep->de_pmp; 573 u_long count; 574 int error; 575 576 /* 577 * The root of a DOS filesystem cannot be extended. 578 */ 579 if ((DETOV(dep)->v_flag & VROOT) && !FAT32(pmp)) 580 return (EINVAL); 581 582 /* 583 * Directories cannot be extended. 584 */ 585 if (dep->de_Attributes & ATTR_DIRECTORY) 586 return (EISDIR); 587 588 if (length <= dep->de_FileSize) 589 panic("deextend: file too large"); 590 591 /* 592 * Compute the number of clusters to allocate. 593 */ 594 count = de_clcount(pmp, length) - de_clcount(pmp, dep->de_FileSize); 595 if (count > 0) { 596 if (count > pmp->pm_freeclustercount) 597 return (ENOSPC); 598 error = extendfile(dep, count, NULL, NULL, DE_CLEAR); 599 if (error) { 600 /* truncate the added clusters away again */ 601 (void) detrunc(dep, dep->de_FileSize, 0, cred, NULL); 602 return (error); 603 } 604 } 605 dep->de_FileSize = length; 606 dep->de_flag |= DE_UPDATE|DE_MODIFIED; 607 return (deupdat(dep, 1)); 608 } 609 610 /* 611 * Move a denode to its correct hash queue after the file it represents has 612 * been moved to a new directory. 613 */ 614 void 615 reinsert(dep) 616 struct denode *dep; 617 { 618 /* 619 * Fix up the denode cache. If the denode is for a directory, 620 * there is nothing to do since the hash is based on the starting 621 * cluster of the directory file and that hasn't changed. If for a 622 * file the hash is based on the location of the directory entry, 623 * so we must remove it from the cache and re-enter it with the 624 * hash based on the new location of the directory entry. 625 */ 626 if (dep->de_Attributes & ATTR_DIRECTORY) 627 return; 628 msdosfs_hashrem(dep); 629 msdosfs_hashins(dep); 630 } 631 632 int 633 msdosfs_reclaim(ap) 634 struct vop_reclaim_args /* { 635 struct vnode *a_vp; 636 } */ *ap; 637 { 638 struct vnode *vp = ap->a_vp; 639 struct denode *dep = VTODE(vp); 640 641 #ifdef MSDOSFS_DEBUG 642 printf("msdosfs_reclaim(): dep %p, file %s, refcnt %ld\n", 643 dep, dep->de_Name, dep->de_refcnt); 644 #endif 645 646 if (prtactive && vp->v_usecount != 0) 647 vprint("msdosfs_reclaim(): pushing active", vp); 648 /* 649 * Remove the denode from its hash chain. 650 */ 651 msdosfs_hashrem(dep); 652 /* 653 * Purge old data structures associated with the denode. 654 */ 655 cache_purge(vp); 656 if (dep->de_devvp) { 657 vrele(dep->de_devvp); 658 dep->de_devvp = 0; 659 } 660 #if 0 /* XXX */ 661 dep->de_flag = 0; 662 #endif 663 FREE(dep, M_MSDOSFSNODE); 664 vp->v_data = NULL; 665 666 return (0); 667 } 668 669 int 670 msdosfs_inactive(ap) 671 struct vop_inactive_args /* { 672 struct vnode *a_vp; 673 struct proc *a_p; 674 } */ *ap; 675 { 676 struct vnode *vp = ap->a_vp; 677 struct denode *dep = VTODE(vp); 678 struct proc *p = ap->a_p; 679 int error = 0; 680 681 #ifdef MSDOSFS_DEBUG 682 printf("msdosfs_inactive(): dep %p, de_Name[0] %x\n", dep, dep->de_Name[0]); 683 #endif 684 685 if (prtactive && vp->v_usecount != 0) 686 vprint("msdosfs_inactive(): pushing active", vp); 687 688 /* 689 * Ignore denodes related to stale file handles. 690 */ 691 if (dep->de_Name[0] == SLOT_DELETED) 692 goto out; 693 694 /* 695 * If the file has been deleted and it is on a read/write 696 * filesystem, then truncate the file, and mark the directory slot 697 * as empty. (This may not be necessary for the dos filesystem.) 698 */ 699 #ifdef MSDOSFS_DEBUG 700 printf("msdosfs_inactive(): dep %p, refcnt %ld, mntflag %x, MNT_RDONLY %x\n", 701 dep, dep->de_refcnt, vp->v_mount->mnt_flag, MNT_RDONLY); 702 #endif 703 if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 704 error = detrunc(dep, (u_long) 0, 0, NOCRED, p); 705 dep->de_flag |= DE_UPDATE; 706 dep->de_Name[0] = SLOT_DELETED; 707 } 708 deupdat(dep, 0); 709 710 out: 711 VOP_UNLOCK(vp, 0, p); 712 /* 713 * If we are done with the denode, reclaim it 714 * so that it can be reused immediately. 715 */ 716 #ifdef MSDOSFS_DEBUG 717 printf("msdosfs_inactive(): v_usecount %d, de_Name[0] %x\n", vp->v_usecount, 718 dep->de_Name[0]); 719 #endif 720 if (dep->de_Name[0] == SLOT_DELETED) 721 vrecycle(vp, (struct simplelock *)0, p); 722 return (error); 723 } 724