Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/msdosfs/msdosfs_denode.c
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1 /* $FreeBSD$ */ 2 /* $NetBSD: msdosfs_denode.c,v 1.28 1998/02/10 14:10:00 mrg Exp $ */ 3 4 /*- 5 * 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/buf.h> 58 #include <sys/vnode.h> 59 60 #include <vm/vm.h> 61 #include <vm/vm_extern.h> 62 63 #include <msdosfs/bpb.h> 64 #include <msdosfs/msdosfsmount.h> 65 #include <msdosfs/direntry.h> 66 #include <msdosfs/denode.h> 67 #include <msdosfs/fat.h> 68 69 static MALLOC_DEFINE(M_MSDOSFSNODE, "MSDOSFS node", "MSDOSFS vnode private part"); 70 71 static struct denode **dehashtbl; 72 static u_long dehash; /* size of hash table - 1 */ 73 #define DEHASH(dev, dcl, doff) (dehashtbl[((dev) + (dcl) + (doff) / \ 74 sizeof(struct direntry)) & dehash]) 75 #ifndef NULL_SIMPLELOCKS 76 static struct simplelock dehash_slock; 77 #endif 78 79 union _qcvt { 80 quad_t qcvt; 81 long val[2]; 82 }; 83 #define SETHIGH(q, h) { \ 84 union _qcvt tmp; \ 85 tmp.qcvt = (q); \ 86 tmp.val[_QUAD_HIGHWORD] = (h); \ 87 (q) = tmp.qcvt; \ 88 } 89 #define SETLOW(q, l) { \ 90 union _qcvt tmp; \ 91 tmp.qcvt = (q); \ 92 tmp.val[_QUAD_LOWWORD] = (l); \ 93 (q) = tmp.qcvt; \ 94 } 95 96 static struct denode * 97 msdosfs_hashget __P((dev_t dev, u_long dirclust, 98 u_long diroff)); 99 static void msdosfs_hashins __P((struct denode *dep)); 100 static void msdosfs_hashrem __P((struct denode *dep)); 101 102 /*ARGSUSED*/ 103 int 104 msdosfs_init(vfsp) 105 struct vfsconf *vfsp; 106 { 107 dehashtbl = hashinit(desiredvnodes/2, M_MSDOSFSMNT, &dehash); 108 simple_lock_init(&dehash_slock); 109 return (0); 110 } 111 112 static struct denode * 113 msdosfs_hashget(dev, dirclust, diroff) 114 dev_t dev; 115 u_long dirclust; 116 u_long diroff; 117 { 118 struct proc *p = curproc; /* XXX */ 119 struct denode *dep; 120 struct vnode *vp; 121 122 loop: 123 simple_lock(&dehash_slock); 124 for (dep = DEHASH(dev, dirclust, diroff); dep; dep = dep->de_next) { 125 if (dirclust == dep->de_dirclust 126 && diroff == dep->de_diroffset 127 && dev == dep->de_dev 128 && dep->de_refcnt != 0) { 129 vp = DETOV(dep); 130 simple_lock(&vp->v_interlock); 131 simple_unlock(&dehash_slock); 132 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, p)) 133 goto loop; 134 return (dep); 135 } 136 } 137 simple_unlock(&dehash_slock); 138 return (NULL); 139 } 140 141 static void 142 msdosfs_hashins(dep) 143 struct denode *dep; 144 { 145 struct denode **depp, *deq; 146 147 simple_lock(&dehash_slock); 148 depp = &DEHASH(dep->de_dev, dep->de_dirclust, dep->de_diroffset); 149 deq = *depp; 150 if (deq) 151 deq->de_prev = &dep->de_next; 152 dep->de_next = deq; 153 dep->de_prev = depp; 154 *depp = dep; 155 simple_unlock(&dehash_slock); 156 } 157 158 static void 159 msdosfs_hashrem(dep) 160 struct denode *dep; 161 { 162 struct denode *deq; 163 164 simple_lock(&dehash_slock); 165 deq = dep->de_next; 166 if (deq) 167 deq->de_prev = dep->de_prev; 168 *dep->de_prev = deq; 169 #ifdef DIAGNOSTIC 170 dep->de_next = NULL; 171 dep->de_prev = NULL; 172 #endif 173 simple_unlock(&dehash_slock); 174 } 175 176 /* 177 * If deget() succeeds it returns with the gotten denode locked(). 178 * 179 * pmp - address of msdosfsmount structure of the filesystem containing 180 * the denode of interest. The pm_dev field and the address of 181 * the msdosfsmount structure are used. 182 * dirclust - which cluster bp contains, if dirclust is 0 (root directory) 183 * diroffset is relative to the beginning of the root directory, 184 * otherwise it is cluster relative. 185 * diroffset - offset past begin of cluster of denode we want 186 * depp - returns the address of the gotten denode. 187 */ 188 int 189 deget(pmp, dirclust, diroffset, depp) 190 struct msdosfsmount *pmp; /* so we know the maj/min number */ 191 u_long dirclust; /* cluster this dir entry came from */ 192 u_long diroffset; /* index of entry within the cluster */ 193 struct denode **depp; /* returns the addr of the gotten denode */ 194 { 195 int error; 196 dev_t dev = pmp->pm_dev; 197 struct mount *mntp = pmp->pm_mountp; 198 struct direntry *direntptr; 199 struct denode *ldep; 200 struct vnode *nvp; 201 struct buf *bp; 202 struct proc *p = curproc; /* XXX */ 203 struct timeval tv; 204 205 #ifdef MSDOSFS_DEBUG 206 printf("deget(pmp %p, dirclust %lu, diroffset %lx, depp %p)\n", 207 pmp, dirclust, diroffset, depp); 208 #endif 209 210 /* 211 * On FAT32 filesystems, root is a (more or less) normal 212 * directory 213 */ 214 if (FAT32(pmp) && dirclust == MSDOSFSROOT) 215 dirclust = pmp->pm_rootdirblk; 216 217 /* 218 * See if the denode is in the denode cache. Use the location of 219 * the directory entry to compute the hash value. For subdir use 220 * address of "." entry. For root dir (if not FAT32) use cluster 221 * MSDOSFSROOT, offset MSDOSFSROOT_OFS 222 * 223 * NOTE: The check for de_refcnt > 0 below insures the denode being 224 * examined does not represent an unlinked but still open file. 225 * These files are not to be accessible even when the directory 226 * entry that represented the file happens to be reused while the 227 * deleted file is still open. 228 */ 229 ldep = msdosfs_hashget(dev, dirclust, diroffset); 230 if (ldep) { 231 *depp = ldep; 232 return (0); 233 } 234 235 /* 236 * Do the MALLOC before the getnewvnode since doing so afterward 237 * might cause a bogus v_data pointer to get dereferenced 238 * elsewhere if MALLOC should block. 239 */ 240 MALLOC(ldep, struct denode *, sizeof(struct denode), M_MSDOSFSNODE, M_WAITOK); 241 242 /* 243 * Directory entry was not in cache, have to create a vnode and 244 * copy it from the passed disk buffer. 245 */ 246 /* getnewvnode() does a VREF() on the vnode */ 247 error = getnewvnode(VT_MSDOSFS, mntp, msdosfs_vnodeop_p, &nvp); 248 if (error) { 249 *depp = NULL; 250 FREE(ldep, M_MSDOSFSNODE); 251 return error; 252 } 253 bzero((caddr_t)ldep, sizeof *ldep); 254 lockinit(&ldep->de_lock, PINOD, "denode", 0, 0); 255 nvp->v_data = ldep; 256 ldep->de_vnode = nvp; 257 ldep->de_flag = 0; 258 ldep->de_devvp = 0; 259 ldep->de_dev = dev; 260 ldep->de_dirclust = dirclust; 261 ldep->de_diroffset = diroffset; 262 fc_purge(ldep, 0); /* init the fat cache for this denode */ 263 264 /* 265 * Lock the denode so that it can't be accessed until we've read 266 * it in and have done what we need to it. Do this here instead 267 * of at the start of msdosfs_hashins() so that reinsert() can 268 * call msdosfs_hashins() with a locked denode. 269 */ 270 if (lockmgr(&ldep->de_lock, LK_EXCLUSIVE, (struct simplelock *)0, p)) 271 panic("deget: unexpected lock failure"); 272 273 /* 274 * Insert the denode into the hash queue. 275 */ 276 msdosfs_hashins(ldep); 277 278 ldep->de_pmp = pmp; 279 ldep->de_refcnt = 1; 280 /* 281 * Copy the directory entry into the denode area of the vnode. 282 */ 283 if ((dirclust == MSDOSFSROOT 284 || (FAT32(pmp) && dirclust == pmp->pm_rootdirblk)) 285 && diroffset == MSDOSFSROOT_OFS) { 286 /* 287 * Directory entry for the root directory. There isn't one, 288 * so we manufacture one. We should probably rummage 289 * through the root directory and find a label entry (if it 290 * exists), and then use the time and date from that entry 291 * as the time and date for the root denode. 292 */ 293 nvp->v_flag |= VROOT; /* should be further down XXX */ 294 295 ldep->de_Attributes = ATTR_DIRECTORY; 296 ldep->de_LowerCase = 0; 297 if (FAT32(pmp)) 298 ldep->de_StartCluster = pmp->pm_rootdirblk; 299 /* de_FileSize will be filled in further down */ 300 else { 301 ldep->de_StartCluster = MSDOSFSROOT; 302 ldep->de_FileSize = pmp->pm_rootdirsize * DEV_BSIZE; 303 } 304 /* 305 * fill in time and date so that dos2unixtime() doesn't 306 * spit up when called from msdosfs_getattr() with root 307 * denode 308 */ 309 ldep->de_CHun = 0; 310 ldep->de_CTime = 0x0000; /* 00:00:00 */ 311 ldep->de_CDate = (0 << DD_YEAR_SHIFT) | (1 << DD_MONTH_SHIFT) 312 | (1 << DD_DAY_SHIFT); 313 /* Jan 1, 1980 */ 314 ldep->de_ADate = ldep->de_CDate; 315 ldep->de_MTime = ldep->de_CTime; 316 ldep->de_MDate = ldep->de_CDate; 317 /* leave the other fields as garbage */ 318 } else { 319 error = readep(pmp, dirclust, diroffset, &bp, &direntptr); 320 if (error) { 321 /* 322 * The denode does not contain anything useful, so 323 * it would be wrong to leave it on its hash chain. 324 * Arrange for vput() to just forget about it. 325 */ 326 ldep->de_Name[0] = SLOT_DELETED; 327 328 vput(nvp); 329 *depp = NULL; 330 return (error); 331 } 332 DE_INTERNALIZE(ldep, direntptr); 333 brelse(bp); 334 } 335 336 /* 337 * Fill in a few fields of the vnode and finish filling in the 338 * denode. Then return the address of the found denode. 339 */ 340 if (ldep->de_Attributes & ATTR_DIRECTORY) { 341 /* 342 * Since DOS directory entries that describe directories 343 * have 0 in the filesize field, we take this opportunity 344 * to find out the length of the directory and plug it into 345 * the denode structure. 346 */ 347 u_long size; 348 349 nvp->v_type = VDIR; 350 if (ldep->de_StartCluster != MSDOSFSROOT) { 351 error = pcbmap(ldep, 0xffff, 0, &size, 0); 352 if (error == E2BIG) { 353 ldep->de_FileSize = de_cn2off(pmp, size); 354 error = 0; 355 } else 356 printf("deget(): pcbmap returned %d\n", error); 357 } 358 } else 359 nvp->v_type = VREG; 360 getmicrouptime(&tv); 361 SETHIGH(ldep->de_modrev, tv.tv_sec); 362 SETLOW(ldep->de_modrev, tv.tv_usec * 4294); 363 ldep->de_devvp = pmp->pm_devvp; 364 VREF(ldep->de_devvp); 365 *depp = ldep; 366 return (0); 367 } 368 369 int 370 deupdat(dep, waitfor) 371 struct denode *dep; 372 int waitfor; 373 { 374 int error; 375 struct buf *bp; 376 struct direntry *dirp; 377 struct timespec ts; 378 379 if (DETOV(dep)->v_mount->mnt_flag & MNT_RDONLY) 380 return (0); 381 getnanotime(&ts); 382 DETIMES(dep, &ts, &ts, &ts); 383 if ((dep->de_flag & DE_MODIFIED) == 0) 384 return (0); 385 dep->de_flag &= ~DE_MODIFIED; 386 if (dep->de_Attributes & ATTR_DIRECTORY) 387 return (0); 388 if (dep->de_refcnt <= 0) 389 return (0); 390 error = readde(dep, &bp, &dirp); 391 if (error) 392 return (error); 393 DE_EXTERNALIZE(dirp, dep); 394 if (waitfor) 395 return (bwrite(bp)); 396 else { 397 bdwrite(bp); 398 return (0); 399 } 400 } 401 402 /* 403 * Truncate the file described by dep to the length specified by length. 404 */ 405 int 406 detrunc(dep, length, flags, cred, p) 407 struct denode *dep; 408 u_long length; 409 int flags; 410 struct ucred *cred; 411 struct proc *p; 412 { 413 int error; 414 int allerror; 415 u_long eofentry; 416 u_long chaintofree; 417 daddr_t bn; 418 int boff; 419 int isadir = dep->de_Attributes & ATTR_DIRECTORY; 420 struct buf *bp; 421 struct msdosfsmount *pmp = dep->de_pmp; 422 423 #ifdef MSDOSFS_DEBUG 424 printf("detrunc(): file %s, length %lu, flags %x\n", dep->de_Name, length, flags); 425 #endif 426 427 /* 428 * Disallow attempts to truncate the root directory since it is of 429 * fixed size. That's just the way dos filesystems are. We use 430 * the VROOT bit in the vnode because checking for the directory 431 * bit and a startcluster of 0 in the denode is not adequate to 432 * recognize the root directory at this point in a file or 433 * directory's life. 434 */ 435 if ((DETOV(dep)->v_flag & VROOT) && !FAT32(pmp)) { 436 printf("detrunc(): can't truncate root directory, clust %ld, offset %ld\n", 437 dep->de_dirclust, dep->de_diroffset); 438 return (EINVAL); 439 } 440 441 442 if (dep->de_FileSize < length) { 443 vnode_pager_setsize(DETOV(dep), length); 444 return deextend(dep, length, cred); 445 } 446 447 /* 448 * If the desired length is 0 then remember the starting cluster of 449 * the file and set the StartCluster field in the directory entry 450 * to 0. If the desired length is not zero, then get the number of 451 * the last cluster in the shortened file. Then get the number of 452 * the first cluster in the part of the file that is to be freed. 453 * Then set the next cluster pointer in the last cluster of the 454 * file to CLUST_EOFE. 455 */ 456 if (length == 0) { 457 chaintofree = dep->de_StartCluster; 458 dep->de_StartCluster = 0; 459 eofentry = ~0; 460 } else { 461 error = pcbmap(dep, de_clcount(pmp, length) - 1, 0, 462 &eofentry, 0); 463 if (error) { 464 #ifdef MSDOSFS_DEBUG 465 printf("detrunc(): pcbmap fails %d\n", error); 466 #endif 467 return (error); 468 } 469 } 470 471 fc_purge(dep, de_clcount(pmp, length)); 472 473 /* 474 * If the new length is not a multiple of the cluster size then we 475 * must zero the tail end of the new last cluster in case it 476 * becomes part of the file again because of a seek. 477 */ 478 if ((boff = length & pmp->pm_crbomask) != 0) { 479 if (isadir) { 480 bn = cntobn(pmp, eofentry); 481 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, 482 NOCRED, &bp); 483 } else { 484 bn = de_blk(pmp, length); 485 error = bread(DETOV(dep), bn, pmp->pm_bpcluster, 486 NOCRED, &bp); 487 } 488 if (error) { 489 brelse(bp); 490 #ifdef MSDOSFS_DEBUG 491 printf("detrunc(): bread fails %d\n", error); 492 #endif 493 return (error); 494 } 495 /* 496 * is this the right place for it? 497 */ 498 bzero(bp->b_data + boff, pmp->pm_bpcluster - boff); 499 if (flags & IO_SYNC) 500 bwrite(bp); 501 else 502 bdwrite(bp); 503 } 504 505 /* 506 * Write out the updated directory entry. Even if the update fails 507 * we free the trailing clusters. 508 */ 509 dep->de_FileSize = length; 510 if (!isadir) 511 dep->de_flag |= DE_UPDATE|DE_MODIFIED; 512 allerror = vtruncbuf(DETOV(dep), cred, p, length, pmp->pm_bpcluster); 513 #ifdef MSDOSFS_DEBUG 514 if (allerror) 515 printf("detrunc(): vtruncbuf error %d\n", allerror); 516 #endif 517 error = deupdat(dep, 1); 518 if (error && (allerror == 0)) 519 allerror = error; 520 #ifdef MSDOSFS_DEBUG 521 printf("detrunc(): allerror %d, eofentry %lu\n", 522 allerror, eofentry); 523 #endif 524 525 /* 526 * If we need to break the cluster chain for the file then do it 527 * now. 528 */ 529 if (eofentry != ~0) { 530 error = fatentry(FAT_GET_AND_SET, pmp, eofentry, 531 &chaintofree, CLUST_EOFE); 532 if (error) { 533 #ifdef MSDOSFS_DEBUG 534 printf("detrunc(): fatentry errors %d\n", error); 535 #endif 536 return (error); 537 } 538 fc_setcache(dep, FC_LASTFC, de_cluster(pmp, length - 1), 539 eofentry); 540 } 541 542 /* 543 * Now free the clusters removed from the file because of the 544 * truncation. 545 */ 546 if (chaintofree != 0 && !MSDOSFSEOF(pmp, chaintofree)) 547 freeclusterchain(pmp, chaintofree); 548 549 return (allerror); 550 } 551 552 /* 553 * Extend the file described by dep to length specified by length. 554 */ 555 int 556 deextend(dep, length, cred) 557 struct denode *dep; 558 u_long length; 559 struct ucred *cred; 560 { 561 struct msdosfsmount *pmp = dep->de_pmp; 562 u_long count; 563 int error; 564 565 /* 566 * The root of a DOS filesystem cannot be extended. 567 */ 568 if ((DETOV(dep)->v_flag & VROOT) && !FAT32(pmp)) 569 return (EINVAL); 570 571 /* 572 * Directories cannot be extended. 573 */ 574 if (dep->de_Attributes & ATTR_DIRECTORY) 575 return (EISDIR); 576 577 if (length <= dep->de_FileSize) 578 panic("deextend: file too large"); 579 580 /* 581 * Compute the number of clusters to allocate. 582 */ 583 count = de_clcount(pmp, length) - de_clcount(pmp, dep->de_FileSize); 584 if (count > 0) { 585 if (count > pmp->pm_freeclustercount) 586 return (ENOSPC); 587 error = extendfile(dep, count, NULL, NULL, DE_CLEAR); 588 if (error) { 589 /* truncate the added clusters away again */ 590 (void) detrunc(dep, dep->de_FileSize, 0, cred, NULL); 591 return (error); 592 } 593 } 594 dep->de_FileSize = length; 595 dep->de_flag |= DE_UPDATE|DE_MODIFIED; 596 return (deupdat(dep, 1)); 597 } 598 599 /* 600 * Move a denode to its correct hash queue after the file it represents has 601 * been moved to a new directory. 602 */ 603 void 604 reinsert(dep) 605 struct denode *dep; 606 { 607 /* 608 * Fix up the denode cache. If the denode is for a directory, 609 * there is nothing to do since the hash is based on the starting 610 * cluster of the directory file and that hasn't changed. If for a 611 * file the hash is based on the location of the directory entry, 612 * so we must remove it from the cache and re-enter it with the 613 * hash based on the new location of the directory entry. 614 */ 615 if (dep->de_Attributes & ATTR_DIRECTORY) 616 return; 617 msdosfs_hashrem(dep); 618 msdosfs_hashins(dep); 619 } 620 621 int 622 msdosfs_reclaim(ap) 623 struct vop_reclaim_args /* { 624 struct vnode *a_vp; 625 } */ *ap; 626 { 627 struct vnode *vp = ap->a_vp; 628 struct denode *dep = VTODE(vp); 629 630 #ifdef MSDOSFS_DEBUG 631 printf("msdosfs_reclaim(): dep %p, file %s, refcnt %ld\n", 632 dep, dep->de_Name, dep->de_refcnt); 633 #endif 634 635 if (prtactive && vp->v_usecount != 0) 636 vprint("msdosfs_reclaim(): pushing active", vp); 637 /* 638 * Remove the denode from its hash chain. 639 */ 640 msdosfs_hashrem(dep); 641 /* 642 * Purge old data structures associated with the denode. 643 */ 644 cache_purge(vp); 645 if (dep->de_devvp) { 646 vrele(dep->de_devvp); 647 dep->de_devvp = 0; 648 } 649 #if 0 /* XXX */ 650 dep->de_flag = 0; 651 #endif 652 FREE(dep, M_MSDOSFSNODE); 653 vp->v_data = NULL; 654 655 return (0); 656 } 657 658 int 659 msdosfs_inactive(ap) 660 struct vop_inactive_args /* { 661 struct vnode *a_vp; 662 struct proc *a_p; 663 } */ *ap; 664 { 665 struct vnode *vp = ap->a_vp; 666 struct denode *dep = VTODE(vp); 667 struct proc *p = ap->a_p; 668 int error = 0; 669 670 #ifdef MSDOSFS_DEBUG 671 printf("msdosfs_inactive(): dep %p, de_Name[0] %x\n", dep, dep->de_Name[0]); 672 #endif 673 674 if (prtactive && vp->v_usecount != 0) 675 vprint("msdosfs_inactive(): pushing active", vp); 676 677 /* 678 * Ignore denodes related to stale file handles. 679 */ 680 if (dep->de_Name[0] == SLOT_DELETED) 681 goto out; 682 683 /* 684 * If the file has been deleted and it is on a read/write 685 * filesystem, then truncate the file, and mark the directory slot 686 * as empty. (This may not be necessary for the dos filesystem.) 687 */ 688 #ifdef MSDOSFS_DEBUG 689 printf("msdosfs_inactive(): dep %p, refcnt %ld, mntflag %x, MNT_RDONLY %x\n", 690 dep, dep->de_refcnt, vp->v_mount->mnt_flag, MNT_RDONLY); 691 #endif 692 if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 693 error = detrunc(dep, (u_long) 0, 0, NOCRED, p); 694 dep->de_flag |= DE_UPDATE; 695 dep->de_Name[0] = SLOT_DELETED; 696 } 697 deupdat(dep, 0); 698 699 out: 700 VOP_UNLOCK(vp, 0, p); 701 /* 702 * If we are done with the denode, reclaim it 703 * so that it can be reused immediately. 704 */ 705 #ifdef MSDOSFS_DEBUG 706 printf("msdosfs_inactive(): v_usecount %d, de_Name[0] %x\n", vp->v_usecount, 707 dep->de_Name[0]); 708 #endif 709 if (dep->de_Name[0] == SLOT_DELETED) 710 vrecycle(vp, (struct simplelock *)0, p); 711 return (error); 712 }
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