1 /* $FreeBSD: src/sys/msdosfs/msdosfs_denode.c,v 1.47.2.3 2002/08/22 16:20:15 trhodes Exp $ */ 2 /* $DragonFly: src/sys/vfs/msdosfs/msdosfs_denode.c,v 1.7 2003/08/07 21:17:41 dillon Exp $ */ 3 /* $NetBSD: msdosfs_denode.c,v 1.28 1998/02/10 14:10:00 mrg Exp $ */ 4 5 /*- 6 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. 7 * Copyright (C) 1994, 1995, 1997 TooLs GmbH. 8 * All rights reserved. 9 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by TooLs GmbH. 22 * 4. The name of TooLs GmbH may not be used to endorse or promote products 23 * derived from this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 26 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 27 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 28 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 29 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 30 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 31 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 32 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 33 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 34 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 35 */ 36 /* 37 * Written by Paul Popelka (paulp@uts.amdahl.com) 38 * 39 * You can do anything you want with this software, just don't say you wrote 40 * it, and don't remove this notice. 41 * 42 * This software is provided "as is". 43 * 44 * The author supplies this software to be publicly redistributed on the 45 * understanding that the author is not responsible for the correct 46 * functioning of this software in any circumstances and is not liable for 47 * any damages caused by this software. 48 * 49 * October 1992 50 */ 51 52 #include <sys/param.h> 53 #include <sys/systm.h> 54 #include <sys/kernel.h> 55 #include <sys/mount.h> 56 #include <sys/malloc.h> 57 #include <sys/proc.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 "bpb.h" 65 #include "msdosfsmount.h" 66 #include "direntry.h" 67 #include "denode.h" 68 #include "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 static struct lwkt_token dehash_token; 77 78 union _qcvt { 79 quad_t qcvt; 80 long val[2]; 81 }; 82 #define SETHIGH(q, h) { \ 83 union _qcvt tmp; \ 84 tmp.qcvt = (q); \ 85 tmp.val[_QUAD_HIGHWORD] = (h); \ 86 (q) = tmp.qcvt; \ 87 } 88 #define SETLOW(q, l) { \ 89 union _qcvt tmp; \ 90 tmp.qcvt = (q); \ 91 tmp.val[_QUAD_LOWWORD] = (l); \ 92 (q) = tmp.qcvt; \ 93 } 94 95 static struct denode * 96 msdosfs_hashget __P((dev_t dev, u_long dirclust, 97 u_long diroff)); 98 static void msdosfs_hashins __P((struct denode *dep)); 99 static void msdosfs_hashrem __P((struct denode *dep)); 100 101 /*ARGSUSED*/ 102 int 103 msdosfs_init(vfsp) 104 struct vfsconf *vfsp; 105 { 106 dehashtbl = hashinit(desiredvnodes/2, M_MSDOSFSMNT, &dehash); 107 lwkt_inittoken(&dehash_token); 108 return (0); 109 } 110 111 int 112 msdosfs_uninit(vfsp) 113 struct vfsconf *vfsp; 114 { 115 116 if (dehashtbl) 117 free(dehashtbl, M_MSDOSFSMNT); 118 return (0); 119 } 120 121 static struct denode * 122 msdosfs_hashget(dev, dirclust, diroff) 123 dev_t dev; 124 u_long dirclust; 125 u_long diroff; 126 { 127 struct thread *td = curthread; /* XXX */ 128 struct denode *dep; 129 struct vnode *vp; 130 131 loop: 132 lwkt_gettoken(&dehash_token); 133 for (dep = DEHASH(dev, dirclust, diroff); dep; dep = dep->de_next) { 134 if (dirclust == dep->de_dirclust 135 && diroff == dep->de_diroffset 136 && dev == dep->de_dev 137 && dep->de_refcnt != 0) { 138 vp = DETOV(dep); 139 lwkt_gettoken(&vp->v_interlock); 140 lwkt_reltoken(&dehash_token); 141 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) 142 goto loop; 143 return (dep); 144 } 145 } 146 lwkt_reltoken(&dehash_token); 147 return (NULL); 148 } 149 150 static void 151 msdosfs_hashins(dep) 152 struct denode *dep; 153 { 154 struct denode **depp, *deq; 155 156 lwkt_gettoken(&dehash_token); 157 depp = &DEHASH(dep->de_dev, dep->de_dirclust, dep->de_diroffset); 158 deq = *depp; 159 if (deq) 160 deq->de_prev = &dep->de_next; 161 dep->de_next = deq; 162 dep->de_prev = depp; 163 *depp = dep; 164 lwkt_reltoken(&dehash_token); 165 } 166 167 static void 168 msdosfs_hashrem(dep) 169 struct denode *dep; 170 { 171 struct denode *deq; 172 173 lwkt_gettoken(&dehash_token); 174 deq = dep->de_next; 175 if (deq) 176 deq->de_prev = dep->de_prev; 177 *dep->de_prev = deq; 178 #ifdef DIAGNOSTIC 179 dep->de_next = NULL; 180 dep->de_prev = NULL; 181 #endif 182 lwkt_reltoken(&dehash_token); 183 } 184 185 /* 186 * If deget() succeeds it returns with the gotten denode locked(). 187 * 188 * pmp - address of msdosfsmount structure of the filesystem containing 189 * the denode of interest. The pm_dev field and the address of 190 * the msdosfsmount structure are used. 191 * dirclust - which cluster bp contains, if dirclust is 0 (root directory) 192 * diroffset is relative to the beginning of the root directory, 193 * otherwise it is cluster relative. 194 * diroffset - offset past begin of cluster of denode we want 195 * depp - returns the address of the gotten denode. 196 */ 197 int 198 deget(pmp, dirclust, diroffset, depp) 199 struct msdosfsmount *pmp; /* so we know the maj/min number */ 200 u_long dirclust; /* cluster this dir entry came from */ 201 u_long diroffset; /* index of entry within the cluster */ 202 struct denode **depp; /* returns the addr of the gotten denode */ 203 { 204 struct thread *td = curthread; /* XXX */ 205 int error; 206 dev_t dev = pmp->pm_dev; 207 struct mount *mntp = pmp->pm_mountp; 208 struct direntry *direntptr; 209 struct denode *ldep; 210 struct vnode *nvp; 211 struct buf *bp; 212 struct timeval tv; 213 214 #ifdef MSDOSFS_DEBUG 215 printf("deget(pmp %p, dirclust %lu, diroffset %lx, depp %p)\n", 216 pmp, dirclust, diroffset, depp); 217 #endif 218 219 /* 220 * On FAT32 filesystems, root is a (more or less) normal 221 * directory 222 */ 223 if (FAT32(pmp) && dirclust == MSDOSFSROOT) 224 dirclust = pmp->pm_rootdirblk; 225 226 /* 227 * See if the denode is in the denode cache. Use the location of 228 * the directory entry to compute the hash value. For subdir use 229 * address of "." entry. For root dir (if not FAT32) use cluster 230 * MSDOSFSROOT, offset MSDOSFSROOT_OFS 231 * 232 * NOTE: The check for de_refcnt > 0 below insures the denode being 233 * examined does not represent an unlinked but still open file. 234 * These files are not to be accessible even when the directory 235 * entry that represented the file happens to be reused while the 236 * deleted file is still open. 237 */ 238 ldep = msdosfs_hashget(dev, dirclust, diroffset); 239 if (ldep) { 240 *depp = ldep; 241 return (0); 242 } 243 244 /* 245 * Do the MALLOC before the getnewvnode since doing so afterward 246 * might cause a bogus v_data pointer to get dereferenced 247 * elsewhere if MALLOC should block. 248 */ 249 MALLOC(ldep, struct denode *, sizeof(struct denode), M_MSDOSFSNODE, M_WAITOK); 250 251 /* 252 * Directory entry was not in cache, have to create a vnode and 253 * copy it from the passed disk buffer. 254 */ 255 /* getnewvnode() does a VREF() on the vnode */ 256 error = getnewvnode(VT_MSDOSFS, mntp, msdosfs_vnodeop_p, &nvp); 257 if (error) { 258 *depp = NULL; 259 FREE(ldep, M_MSDOSFSNODE); 260 return error; 261 } 262 bzero((caddr_t)ldep, sizeof *ldep); 263 lockinit(&ldep->de_lock, 0, "denode", VLKTIMEOUT, 0); 264 nvp->v_data = ldep; 265 ldep->de_vnode = nvp; 266 ldep->de_flag = 0; 267 ldep->de_devvp = 0; 268 ldep->de_dev = dev; 269 ldep->de_dirclust = dirclust; 270 ldep->de_diroffset = diroffset; 271 fc_purge(ldep, 0); /* init the fat cache for this denode */ 272 273 /* 274 * Lock the denode so that it can't be accessed until we've read 275 * it in and have done what we need to it. Do this here instead 276 * of at the start of msdosfs_hashins() so that reinsert() can 277 * call msdosfs_hashins() with a locked denode. 278 */ 279 if (lockmgr(&ldep->de_lock, LK_EXCLUSIVE, NULL, td)) 280 panic("deget: unexpected lock failure"); 281 282 /* 283 * Insert the denode into the hash queue. 284 */ 285 msdosfs_hashins(ldep); 286 287 ldep->de_pmp = pmp; 288 ldep->de_refcnt = 1; 289 /* 290 * Copy the directory entry into the denode area of the vnode. 291 */ 292 if ((dirclust == MSDOSFSROOT 293 || (FAT32(pmp) && dirclust == pmp->pm_rootdirblk)) 294 && diroffset == MSDOSFSROOT_OFS) { 295 /* 296 * Directory entry for the root directory. There isn't one, 297 * so we manufacture one. We should probably rummage 298 * through the root directory and find a label entry (if it 299 * exists), and then use the time and date from that entry 300 * as the time and date for the root denode. 301 */ 302 nvp->v_flag |= VROOT; /* should be further down XXX */ 303 304 ldep->de_Attributes = ATTR_DIRECTORY; 305 ldep->de_LowerCase = 0; 306 if (FAT32(pmp)) 307 ldep->de_StartCluster = pmp->pm_rootdirblk; 308 /* de_FileSize will be filled in further down */ 309 else { 310 ldep->de_StartCluster = MSDOSFSROOT; 311 ldep->de_FileSize = pmp->pm_rootdirsize * DEV_BSIZE; 312 } 313 /* 314 * fill in time and date so that dos2unixtime() doesn't 315 * spit up when called from msdosfs_getattr() with root 316 * denode 317 */ 318 ldep->de_CHun = 0; 319 ldep->de_CTime = 0x0000; /* 00:00:00 */ 320 ldep->de_CDate = (0 << DD_YEAR_SHIFT) | (1 << DD_MONTH_SHIFT) 321 | (1 << DD_DAY_SHIFT); 322 /* Jan 1, 1980 */ 323 ldep->de_ADate = ldep->de_CDate; 324 ldep->de_MTime = ldep->de_CTime; 325 ldep->de_MDate = ldep->de_CDate; 326 /* leave the other fields as garbage */ 327 } else { 328 error = readep(pmp, dirclust, diroffset, &bp, &direntptr); 329 if (error) { 330 /* 331 * The denode does not contain anything useful, so 332 * it would be wrong to leave it on its hash chain. 333 * Arrange for vput() to just forget about it. 334 */ 335 ldep->de_Name[0] = SLOT_DELETED; 336 337 vput(nvp); 338 *depp = NULL; 339 return (error); 340 } 341 DE_INTERNALIZE(ldep, direntptr); 342 brelse(bp); 343 } 344 345 /* 346 * Fill in a few fields of the vnode and finish filling in the 347 * denode. Then return the address of the found denode. 348 */ 349 if (ldep->de_Attributes & ATTR_DIRECTORY) { 350 /* 351 * Since DOS directory entries that describe directories 352 * have 0 in the filesize field, we take this opportunity 353 * to find out the length of the directory and plug it into 354 * the denode structure. 355 */ 356 u_long size; 357 358 /* 359 * XXX Sometimes, these arrives that . entry have cluster 360 * number 0, when it shouldn't. Use real cluster number 361 * instead of what is written in directory entry. 362 */ 363 if ((diroffset == 0) && (ldep->de_StartCluster != dirclust)) { 364 printf("deget(): . entry at clust %ld != %ld\n", 365 dirclust, ldep->de_StartCluster); 366 ldep->de_StartCluster = dirclust; 367 } 368 369 nvp->v_type = VDIR; 370 if (ldep->de_StartCluster != MSDOSFSROOT) { 371 error = pcbmap(ldep, 0xffff, 0, &size, 0); 372 if (error == E2BIG) { 373 ldep->de_FileSize = de_cn2off(pmp, size); 374 error = 0; 375 } else 376 printf("deget(): pcbmap returned %d\n", error); 377 } 378 } else 379 nvp->v_type = VREG; 380 getmicrouptime(&tv); 381 SETHIGH(ldep->de_modrev, tv.tv_sec); 382 SETLOW(ldep->de_modrev, tv.tv_usec * 4294); 383 ldep->de_devvp = pmp->pm_devvp; 384 VREF(ldep->de_devvp); 385 *depp = ldep; 386 return (0); 387 } 388 389 int 390 deupdat(dep, waitfor) 391 struct denode *dep; 392 int waitfor; 393 { 394 int error; 395 struct buf *bp; 396 struct direntry *dirp; 397 struct timespec ts; 398 399 if (DETOV(dep)->v_mount->mnt_flag & MNT_RDONLY) 400 return (0); 401 getnanotime(&ts); 402 DETIMES(dep, &ts, &ts, &ts); 403 if ((dep->de_flag & DE_MODIFIED) == 0) 404 return (0); 405 dep->de_flag &= ~DE_MODIFIED; 406 if (dep->de_Attributes & ATTR_DIRECTORY) 407 return (0); 408 if (dep->de_refcnt <= 0) 409 return (0); 410 error = readde(dep, &bp, &dirp); 411 if (error) 412 return (error); 413 DE_EXTERNALIZE(dirp, dep); 414 if (waitfor) 415 return (bwrite(bp)); 416 else { 417 bdwrite(bp); 418 return (0); 419 } 420 } 421 422 /* 423 * Truncate the file described by dep to the length specified by length. 424 */ 425 int 426 detrunc(dep, length, flags, td) 427 struct denode *dep; 428 u_long length; 429 int flags; 430 struct thread *td; 431 { 432 int error; 433 int allerror; 434 u_long eofentry; 435 u_long chaintofree; 436 daddr_t bn; 437 int boff; 438 int isadir = dep->de_Attributes & ATTR_DIRECTORY; 439 struct buf *bp; 440 struct msdosfsmount *pmp = dep->de_pmp; 441 442 #ifdef MSDOSFS_DEBUG 443 printf("detrunc(): file %s, length %lu, flags %x\n", dep->de_Name, length, flags); 444 #endif 445 446 /* 447 * Disallow attempts to truncate the root directory since it is of 448 * fixed size. That's just the way dos filesystems are. We use 449 * the VROOT bit in the vnode because checking for the directory 450 * bit and a startcluster of 0 in the denode is not adequate to 451 * recognize the root directory at this point in a file or 452 * directory's life. 453 */ 454 if ((DETOV(dep)->v_flag & VROOT) && !FAT32(pmp)) { 455 printf("detrunc(): can't truncate root directory, clust %ld, offset %ld\n", 456 dep->de_dirclust, dep->de_diroffset); 457 return (EINVAL); 458 } 459 460 461 if (dep->de_FileSize < length) { 462 vnode_pager_setsize(DETOV(dep), length); 463 return deextend(dep, length); 464 } 465 466 /* 467 * If the desired length is 0 then remember the starting cluster of 468 * the file and set the StartCluster field in the directory entry 469 * to 0. If the desired length is not zero, then get the number of 470 * the last cluster in the shortened file. Then get the number of 471 * the first cluster in the part of the file that is to be freed. 472 * Then set the next cluster pointer in the last cluster of the 473 * file to CLUST_EOFE. 474 */ 475 if (length == 0) { 476 chaintofree = dep->de_StartCluster; 477 dep->de_StartCluster = 0; 478 eofentry = ~0; 479 } else { 480 error = pcbmap(dep, de_clcount(pmp, length) - 1, 0, 481 &eofentry, 0); 482 if (error) { 483 #ifdef MSDOSFS_DEBUG 484 printf("detrunc(): pcbmap fails %d\n", error); 485 #endif 486 return (error); 487 } 488 } 489 490 fc_purge(dep, de_clcount(pmp, length)); 491 492 /* 493 * If the new length is not a multiple of the cluster size then we 494 * must zero the tail end of the new last cluster in case it 495 * becomes part of the file again because of a seek. 496 */ 497 if ((boff = length & pmp->pm_crbomask) != 0) { 498 if (isadir) { 499 bn = cntobn(pmp, eofentry); 500 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, &bp); 501 } else { 502 bn = de_blk(pmp, length); 503 error = bread(DETOV(dep), bn, pmp->pm_bpcluster, &bp); 504 } 505 if (error) { 506 brelse(bp); 507 #ifdef MSDOSFS_DEBUG 508 printf("detrunc(): bread fails %d\n", error); 509 #endif 510 return (error); 511 } 512 /* 513 * is this the right place for it? 514 */ 515 bzero(bp->b_data + boff, pmp->pm_bpcluster - boff); 516 if (flags & IO_SYNC) 517 bwrite(bp); 518 else 519 bdwrite(bp); 520 } 521 522 /* 523 * Write out the updated directory entry. Even if the update fails 524 * we free the trailing clusters. 525 */ 526 dep->de_FileSize = length; 527 if (!isadir) 528 dep->de_flag |= DE_UPDATE|DE_MODIFIED; 529 allerror = vtruncbuf(DETOV(dep), td, length, pmp->pm_bpcluster); 530 #ifdef MSDOSFS_DEBUG 531 if (allerror) 532 printf("detrunc(): vtruncbuf error %d\n", allerror); 533 #endif 534 error = deupdat(dep, 1); 535 if (error && (allerror == 0)) 536 allerror = error; 537 #ifdef MSDOSFS_DEBUG 538 printf("detrunc(): allerror %d, eofentry %lu\n", 539 allerror, eofentry); 540 #endif 541 542 /* 543 * If we need to break the cluster chain for the file then do it 544 * now. 545 */ 546 if (eofentry != ~0) { 547 error = fatentry(FAT_GET_AND_SET, pmp, eofentry, 548 &chaintofree, CLUST_EOFE); 549 if (error) { 550 #ifdef MSDOSFS_DEBUG 551 printf("detrunc(): fatentry errors %d\n", error); 552 #endif 553 return (error); 554 } 555 fc_setcache(dep, FC_LASTFC, de_cluster(pmp, length - 1), 556 eofentry); 557 } 558 559 /* 560 * Now free the clusters removed from the file because of the 561 * truncation. 562 */ 563 if (chaintofree != 0 && !MSDOSFSEOF(pmp, chaintofree)) 564 freeclusterchain(pmp, chaintofree); 565 566 return (allerror); 567 } 568 569 /* 570 * Extend the file described by dep to length specified by length. 571 */ 572 int 573 deextend(dep, length) 574 struct denode *dep; 575 u_long length; 576 { 577 struct msdosfsmount *pmp = dep->de_pmp; 578 u_long count; 579 int error; 580 581 /* 582 * The root of a DOS filesystem cannot be extended. 583 */ 584 if ((DETOV(dep)->v_flag & VROOT) && !FAT32(pmp)) 585 return (EINVAL); 586 587 /* 588 * Directories cannot be extended. 589 */ 590 if (dep->de_Attributes & ATTR_DIRECTORY) 591 return (EISDIR); 592 593 if (length <= dep->de_FileSize) 594 panic("deextend: file too large"); 595 596 /* 597 * Compute the number of clusters to allocate. 598 */ 599 count = de_clcount(pmp, length) - de_clcount(pmp, dep->de_FileSize); 600 if (count > 0) { 601 if (count > pmp->pm_freeclustercount) 602 return (ENOSPC); 603 error = extendfile(dep, count, NULL, NULL, DE_CLEAR); 604 if (error) { 605 /* truncate the added clusters away again */ 606 (void) detrunc(dep, dep->de_FileSize, 0, NULL); 607 return (error); 608 } 609 } 610 dep->de_FileSize = length; 611 dep->de_flag |= DE_UPDATE|DE_MODIFIED; 612 return (deupdat(dep, 1)); 613 } 614 615 /* 616 * Move a denode to its correct hash queue after the file it represents has 617 * been moved to a new directory. 618 */ 619 void 620 reinsert(dep) 621 struct denode *dep; 622 { 623 /* 624 * Fix up the denode cache. If the denode is for a directory, 625 * there is nothing to do since the hash is based on the starting 626 * cluster of the directory file and that hasn't changed. If for a 627 * file the hash is based on the location of the directory entry, 628 * so we must remove it from the cache and re-enter it with the 629 * hash based on the new location of the directory entry. 630 */ 631 if (dep->de_Attributes & ATTR_DIRECTORY) 632 return; 633 msdosfs_hashrem(dep); 634 msdosfs_hashins(dep); 635 } 636 637 int 638 msdosfs_reclaim(ap) 639 struct vop_reclaim_args /* { 640 struct vnode *a_vp; 641 } */ *ap; 642 { 643 struct vnode *vp = ap->a_vp; 644 struct denode *dep = VTODE(vp); 645 646 #ifdef MSDOSFS_DEBUG 647 printf("msdosfs_reclaim(): dep %p, file %s, refcnt %ld\n", 648 dep, dep->de_Name, dep->de_refcnt); 649 #endif 650 651 if (prtactive && vp->v_usecount != 0) 652 vprint("msdosfs_reclaim(): pushing active", vp); 653 /* 654 * Remove the denode from its hash chain. 655 */ 656 msdosfs_hashrem(dep); 657 /* 658 * Purge old data structures associated with the denode. 659 */ 660 cache_purge(vp); 661 if (dep->de_devvp) { 662 vrele(dep->de_devvp); 663 dep->de_devvp = 0; 664 } 665 #if 0 /* XXX */ 666 dep->de_flag = 0; 667 #endif 668 FREE(dep, M_MSDOSFSNODE); 669 vp->v_data = NULL; 670 671 return (0); 672 } 673 674 int 675 msdosfs_inactive(ap) 676 struct vop_inactive_args /* { 677 struct vnode *a_vp; 678 struct thread *a_td; 679 } */ *ap; 680 { 681 struct vnode *vp = ap->a_vp; 682 struct denode *dep = VTODE(vp); 683 int error = 0; 684 685 #ifdef MSDOSFS_DEBUG 686 printf("msdosfs_inactive(): dep %p, de_Name[0] %x\n", dep, dep->de_Name[0]); 687 #endif 688 689 if (prtactive && vp->v_usecount != 0) 690 vprint("msdosfs_inactive(): pushing active", vp); 691 692 /* 693 * Ignore denodes related to stale file handles. 694 */ 695 if (dep->de_Name[0] == SLOT_DELETED) 696 goto out; 697 698 /* 699 * If the file has been deleted and it is on a read/write 700 * filesystem, then truncate the file, and mark the directory slot 701 * as empty. (This may not be necessary for the dos filesystem.) 702 */ 703 #ifdef MSDOSFS_DEBUG 704 printf("msdosfs_inactive(): dep %p, refcnt %ld, mntflag %x, MNT_RDONLY %x\n", 705 dep, dep->de_refcnt, vp->v_mount->mnt_flag, MNT_RDONLY); 706 #endif 707 if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 708 error = detrunc(dep, (u_long) 0, 0, ap->a_td); 709 dep->de_flag |= DE_UPDATE; 710 dep->de_Name[0] = SLOT_DELETED; 711 } 712 deupdat(dep, 0); 713 714 out: 715 VOP_UNLOCK(vp, 0, ap->a_td); 716 /* 717 * If we are done with the denode, reclaim it 718 * so that it can be reused immediately. 719 */ 720 #ifdef MSDOSFS_DEBUG 721 printf("msdosfs_inactive(): v_usecount %d, de_Name[0] %x\n", vp->v_usecount, 722 dep->de_Name[0]); 723 #endif 724 if (dep->de_Name[0] == SLOT_DELETED) 725 vrecycle(vp, NULL, ap->a_td); 726 return (error); 727 } 728