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/bio.h> 57 #include <sys/buf.h> 58 #include <sys/vnode.h> 59 #include <sys/mutex.h> 60 61 #include <vm/vm.h> 62 #include <vm/vm_extern.h> 63 64 #include <fs/msdosfs/bpb.h> 65 #include <fs/msdosfs/msdosfsmount.h> 66 #include <fs/msdosfs/direntry.h> 67 #include <fs/msdosfs/denode.h> 68 #include <fs/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 static struct mtx dehash_mtx; 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(dev_t dev, u_long dirclust, u_long diroff); 97 static void msdosfs_hashins(struct denode *dep); 98 static void msdosfs_hashrem(struct denode *dep); 99 100 /*ARGSUSED*/ 101 int 102 msdosfs_init(vfsp) 103 struct vfsconf *vfsp; 104 { 105 dehashtbl = hashinit(desiredvnodes/2, M_MSDOSFSMNT, &dehash); 106 mtx_init(&dehash_mtx, "msdosfs dehash", NULL, MTX_DEF); 107 return (0); 108 } 109 110 int 111 msdosfs_uninit(vfsp) 112 struct vfsconf *vfsp; 113 { 114 115 if (dehashtbl) 116 free(dehashtbl, M_MSDOSFSMNT); 117 mtx_destroy(&dehash_mtx); 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 mtx_lock(&dehash_mtx); 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 mtx_lock(&vp->v_interlock); 140 mtx_unlock(&dehash_mtx); 141 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) 142 goto loop; 143 return (dep); 144 } 145 } 146 mtx_unlock(&dehash_mtx); 147 return (NULL); 148 } 149 150 static void 151 msdosfs_hashins(dep) 152 struct denode *dep; 153 { 154 struct denode **depp, *deq; 155 156 mtx_lock(&dehash_mtx); 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 mtx_unlock(&dehash_mtx); 165 } 166 167 static void 168 msdosfs_hashrem(dep) 169 struct denode *dep; 170 { 171 struct denode *deq; 172 173 mtx_lock(&dehash_mtx); 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 mtx_unlock(&dehash_mtx); 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 int error; 205 dev_t dev = pmp->pm_dev; 206 struct mount *mntp = pmp->pm_mountp; 207 struct direntry *direntptr; 208 struct denode *ldep; 209 struct vnode *nvp; 210 struct buf *bp; 211 struct thread *td = curthread; /* XXX */ 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(&nvp->v_lock, PINOD, "denode", VLKTIMEOUT, 0); 264 nvp->v_vnlock = &nvp->v_lock; 265 nvp->v_data = ldep; 266 ldep->de_vnode = nvp; 267 ldep->de_flag = 0; 268 ldep->de_devvp = 0; 269 ldep->de_dev = dev; 270 ldep->de_dirclust = dirclust; 271 ldep->de_diroffset = diroffset; 272 fc_purge(ldep, 0); /* init the fat cache for this denode */ 273 274 /* 275 * Lock the denode so that it can't be accessed until we've read 276 * it in and have done what we need to it. Do this here instead 277 * of at the start of msdosfs_hashins() so that reinsert() can 278 * call msdosfs_hashins() with a locked denode. 279 */ 280 if (VOP_LOCK(nvp, LK_EXCLUSIVE, td) != 0) 281 panic("deget: unexpected lock failure"); 282 283 /* 284 * Insert the denode into the hash queue. 285 */ 286 msdosfs_hashins(ldep); 287 288 ldep->de_pmp = pmp; 289 ldep->de_refcnt = 1; 290 /* 291 * Copy the directory entry into the denode area of the vnode. 292 */ 293 if ((dirclust == MSDOSFSROOT 294 || (FAT32(pmp) && dirclust == pmp->pm_rootdirblk)) 295 && diroffset == MSDOSFSROOT_OFS) { 296 /* 297 * Directory entry for the root directory. There isn't one, 298 * so we manufacture one. We should probably rummage 299 * through the root directory and find a label entry (if it 300 * exists), and then use the time and date from that entry 301 * as the time and date for the root denode. 302 */ 303 nvp->v_vflag |= VV_ROOT; /* should be further down XXX */ 304 305 ldep->de_Attributes = ATTR_DIRECTORY; 306 ldep->de_LowerCase = 0; 307 if (FAT32(pmp)) 308 ldep->de_StartCluster = pmp->pm_rootdirblk; 309 /* de_FileSize will be filled in further down */ 310 else { 311 ldep->de_StartCluster = MSDOSFSROOT; 312 ldep->de_FileSize = pmp->pm_rootdirsize * DEV_BSIZE; 313 } 314 /* 315 * fill in time and date so that dos2unixtime() doesn't 316 * spit up when called from msdosfs_getattr() with root 317 * denode 318 */ 319 ldep->de_CHun = 0; 320 ldep->de_CTime = 0x0000; /* 00:00:00 */ 321 ldep->de_CDate = (0 << DD_YEAR_SHIFT) | (1 << DD_MONTH_SHIFT) 322 | (1 << DD_DAY_SHIFT); 323 /* Jan 1, 1980 */ 324 ldep->de_ADate = ldep->de_CDate; 325 ldep->de_MTime = ldep->de_CTime; 326 ldep->de_MDate = ldep->de_CDate; 327 /* leave the other fields as garbage */ 328 } else { 329 error = readep(pmp, dirclust, diroffset, &bp, &direntptr); 330 if (error) { 331 /* 332 * The denode does not contain anything useful, so 333 * it would be wrong to leave it on its hash chain. 334 * Arrange for vput() to just forget about it. 335 */ 336 ldep->de_Name[0] = SLOT_DELETED; 337 338 vput(nvp); 339 *depp = NULL; 340 return (error); 341 } 342 DE_INTERNALIZE(ldep, direntptr); 343 brelse(bp); 344 } 345 346 /* 347 * Fill in a few fields of the vnode and finish filling in the 348 * denode. Then return the address of the found denode. 349 */ 350 if (ldep->de_Attributes & ATTR_DIRECTORY) { 351 /* 352 * Since DOS directory entries that describe directories 353 * have 0 in the filesize field, we take this opportunity 354 * to find out the length of the directory and plug it into 355 * the denode structure. 356 */ 357 u_long size; 358 359 /* 360 * XXX Sometimes, these arrives that . entry have cluster 361 * number 0, when it shouldn't. Use real cluster number 362 * instead of what is written in directory entry. 363 */ 364 if ((diroffset == 0) && (ldep->de_StartCluster != dirclust)) { 365 printf("deget(): . entry at clust %ld != %ld\n", 366 dirclust, ldep->de_StartCluster); 367 ldep->de_StartCluster = dirclust; 368 } 369 370 nvp->v_type = VDIR; 371 if (ldep->de_StartCluster != MSDOSFSROOT) { 372 error = pcbmap(ldep, 0xffff, 0, &size, 0); 373 if (error == E2BIG) { 374 ldep->de_FileSize = de_cn2off(pmp, size); 375 error = 0; 376 } else 377 printf("deget(): pcbmap returned %d\n", error); 378 } 379 } else 380 nvp->v_type = VREG; 381 getmicrouptime(&tv); 382 SETHIGH(ldep->de_modrev, tv.tv_sec); 383 SETLOW(ldep->de_modrev, tv.tv_usec * 4294); 384 ldep->de_devvp = pmp->pm_devvp; 385 VREF(ldep->de_devvp); 386 *depp = ldep; 387 return (0); 388 } 389 390 int 391 deupdat(dep, waitfor) 392 struct denode *dep; 393 int waitfor; 394 { 395 int error; 396 struct buf *bp; 397 struct direntry *dirp; 398 struct timespec ts; 399 400 if (DETOV(dep)->v_mount->mnt_flag & MNT_RDONLY) 401 return (0); 402 getnanotime(&ts); 403 DETIMES(dep, &ts, &ts, &ts); 404 if ((dep->de_flag & DE_MODIFIED) == 0) 405 return (0); 406 dep->de_flag &= ~DE_MODIFIED; 407 if (dep->de_Attributes & ATTR_DIRECTORY) 408 return (0); 409 if (dep->de_refcnt <= 0) 410 return (0); 411 error = readde(dep, &bp, &dirp); 412 if (error) 413 return (error); 414 DE_EXTERNALIZE(dirp, dep); 415 if (waitfor) 416 return (bwrite(bp)); 417 else { 418 bdwrite(bp); 419 return (0); 420 } 421 } 422 423 /* 424 * Truncate the file described by dep to the length specified by length. 425 */ 426 int 427 detrunc(dep, length, flags, cred, td) 428 struct denode *dep; 429 u_long length; 430 int flags; 431 struct ucred *cred; 432 struct thread *td; 433 { 434 int error; 435 int allerror; 436 u_long eofentry; 437 u_long chaintofree; 438 daddr_t bn; 439 int boff; 440 int isadir = dep->de_Attributes & ATTR_DIRECTORY; 441 struct buf *bp; 442 struct msdosfsmount *pmp = dep->de_pmp; 443 444 #ifdef MSDOSFS_DEBUG 445 printf("detrunc(): file %s, length %lu, flags %x\n", dep->de_Name, length, flags); 446 #endif 447 448 /* 449 * Disallow attempts to truncate the root directory since it is of 450 * fixed size. That's just the way dos filesystems are. We use 451 * the VROOT bit in the vnode because checking for the directory 452 * bit and a startcluster of 0 in the denode is not adequate to 453 * recognize the root directory at this point in a file or 454 * directory's life. 455 */ 456 if ((DETOV(dep)->v_vflag & VV_ROOT) && !FAT32(pmp)) { 457 printf("detrunc(): can't truncate root directory, clust %ld, offset %ld\n", 458 dep->de_dirclust, dep->de_diroffset); 459 return (EINVAL); 460 } 461 462 463 if (dep->de_FileSize < length) { 464 vnode_pager_setsize(DETOV(dep), length); 465 return deextend(dep, length, cred); 466 } 467 468 /* 469 * If the desired length is 0 then remember the starting cluster of 470 * the file and set the StartCluster field in the directory entry 471 * to 0. If the desired length is not zero, then get the number of 472 * the last cluster in the shortened file. Then get the number of 473 * the first cluster in the part of the file that is to be freed. 474 * Then set the next cluster pointer in the last cluster of the 475 * file to CLUST_EOFE. 476 */ 477 if (length == 0) { 478 chaintofree = dep->de_StartCluster; 479 dep->de_StartCluster = 0; 480 eofentry = ~0; 481 } else { 482 error = pcbmap(dep, de_clcount(pmp, length) - 1, 0, 483 &eofentry, 0); 484 if (error) { 485 #ifdef MSDOSFS_DEBUG 486 printf("detrunc(): pcbmap fails %d\n", error); 487 #endif 488 return (error); 489 } 490 } 491 492 fc_purge(dep, de_clcount(pmp, length)); 493 494 /* 495 * If the new length is not a multiple of the cluster size then we 496 * must zero the tail end of the new last cluster in case it 497 * becomes part of the file again because of a seek. 498 */ 499 if ((boff = length & pmp->pm_crbomask) != 0) { 500 if (isadir) { 501 bn = cntobn(pmp, eofentry); 502 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, 503 NOCRED, &bp); 504 } else { 505 bn = de_blk(pmp, length); 506 error = bread(DETOV(dep), bn, pmp->pm_bpcluster, 507 NOCRED, &bp); 508 } 509 if (error) { 510 brelse(bp); 511 #ifdef MSDOSFS_DEBUG 512 printf("detrunc(): bread fails %d\n", error); 513 #endif 514 return (error); 515 } 516 /* 517 * is this the right place for it? 518 */ 519 bzero(bp->b_data + boff, pmp->pm_bpcluster - boff); 520 if (flags & IO_SYNC) 521 bwrite(bp); 522 else 523 bdwrite(bp); 524 } 525 526 /* 527 * Write out the updated directory entry. Even if the update fails 528 * we free the trailing clusters. 529 */ 530 dep->de_FileSize = length; 531 if (!isadir) 532 dep->de_flag |= DE_UPDATE|DE_MODIFIED; 533 allerror = vtruncbuf(DETOV(dep), cred, td, length, pmp->pm_bpcluster); 534 #ifdef MSDOSFS_DEBUG 535 if (allerror) 536 printf("detrunc(): vtruncbuf error %d\n", allerror); 537 #endif 538 error = deupdat(dep, 1); 539 if (error && (allerror == 0)) 540 allerror = error; 541 #ifdef MSDOSFS_DEBUG 542 printf("detrunc(): allerror %d, eofentry %lu\n", 543 allerror, eofentry); 544 #endif 545 546 /* 547 * If we need to break the cluster chain for the file then do it 548 * now. 549 */ 550 if (eofentry != ~0) { 551 error = fatentry(FAT_GET_AND_SET, pmp, eofentry, 552 &chaintofree, CLUST_EOFE); 553 if (error) { 554 #ifdef MSDOSFS_DEBUG 555 printf("detrunc(): fatentry errors %d\n", error); 556 #endif 557 return (error); 558 } 559 fc_setcache(dep, FC_LASTFC, de_cluster(pmp, length - 1), 560 eofentry); 561 } 562 563 /* 564 * Now free the clusters removed from the file because of the 565 * truncation. 566 */ 567 if (chaintofree != 0 && !MSDOSFSEOF(pmp, chaintofree)) 568 freeclusterchain(pmp, chaintofree); 569 570 return (allerror); 571 } 572 573 /* 574 * Extend the file described by dep to length specified by length. 575 */ 576 int 577 deextend(dep, length, cred) 578 struct denode *dep; 579 u_long length; 580 struct ucred *cred; 581 { 582 struct msdosfsmount *pmp = dep->de_pmp; 583 u_long count; 584 int error; 585 586 /* 587 * The root of a DOS filesystem cannot be extended. 588 */ 589 if ((DETOV(dep)->v_vflag & VV_ROOT) && !FAT32(pmp)) 590 return (EINVAL); 591 592 /* 593 * Directories cannot be extended. 594 */ 595 if (dep->de_Attributes & ATTR_DIRECTORY) 596 return (EISDIR); 597 598 if (length <= dep->de_FileSize) 599 panic("deextend: file too large"); 600 601 /* 602 * Compute the number of clusters to allocate. 603 */ 604 count = de_clcount(pmp, length) - de_clcount(pmp, dep->de_FileSize); 605 if (count > 0) { 606 if (count > pmp->pm_freeclustercount) 607 return (ENOSPC); 608 error = extendfile(dep, count, NULL, NULL, DE_CLEAR); 609 if (error) { 610 /* truncate the added clusters away again */ 611 (void) detrunc(dep, dep->de_FileSize, 0, cred, NULL); 612 return (error); 613 } 614 } 615 dep->de_FileSize = length; 616 dep->de_flag |= DE_UPDATE|DE_MODIFIED; 617 return (deupdat(dep, 1)); 618 } 619 620 /* 621 * Move a denode to its correct hash queue after the file it represents has 622 * been moved to a new directory. 623 */ 624 void 625 reinsert(dep) 626 struct denode *dep; 627 { 628 /* 629 * Fix up the denode cache. If the denode is for a directory, 630 * there is nothing to do since the hash is based on the starting 631 * cluster of the directory file and that hasn't changed. If for a 632 * file the hash is based on the location of the directory entry, 633 * so we must remove it from the cache and re-enter it with the 634 * hash based on the new location of the directory entry. 635 */ 636 if (dep->de_Attributes & ATTR_DIRECTORY) 637 return; 638 msdosfs_hashrem(dep); 639 msdosfs_hashins(dep); 640 } 641 642 int 643 msdosfs_reclaim(ap) 644 struct vop_reclaim_args /* { 645 struct vnode *a_vp; 646 } */ *ap; 647 { 648 struct vnode *vp = ap->a_vp; 649 struct denode *dep = VTODE(vp); 650 651 #ifdef MSDOSFS_DEBUG 652 printf("msdosfs_reclaim(): dep %p, file %s, refcnt %ld\n", 653 dep, dep->de_Name, dep->de_refcnt); 654 #endif 655 656 if (prtactive && vp->v_usecount != 0) 657 vprint("msdosfs_reclaim(): pushing active", vp); 658 /* 659 * Remove the denode from its hash chain. 660 */ 661 msdosfs_hashrem(dep); 662 /* 663 * Purge old data structures associated with the denode. 664 */ 665 cache_purge(vp); 666 if (dep->de_devvp) { 667 vrele(dep->de_devvp); 668 dep->de_devvp = 0; 669 } 670 #if 0 /* XXX */ 671 dep->de_flag = 0; 672 #endif 673 lockdestroy(&vp->v_lock); 674 FREE(dep, M_MSDOSFSNODE); 675 vp->v_data = NULL; 676 677 return (0); 678 } 679 680 int 681 msdosfs_inactive(ap) 682 struct vop_inactive_args /* { 683 struct vnode *a_vp; 684 struct thread *a_td; 685 } */ *ap; 686 { 687 struct vnode *vp = ap->a_vp; 688 struct denode *dep = VTODE(vp); 689 struct thread *td = ap->a_td; 690 int error = 0; 691 692 #ifdef MSDOSFS_DEBUG 693 printf("msdosfs_inactive(): dep %p, de_Name[0] %x\n", dep, dep->de_Name[0]); 694 #endif 695 696 if (prtactive && vp->v_usecount != 0) 697 vprint("msdosfs_inactive(): pushing active", vp); 698 699 /* 700 * Ignore denodes related to stale file handles. 701 */ 702 if (dep->de_Name[0] == SLOT_DELETED) 703 goto out; 704 705 /* 706 * If the file has been deleted and it is on a read/write 707 * filesystem, then truncate the file, and mark the directory slot 708 * as empty. (This may not be necessary for the dos filesystem.) 709 */ 710 #ifdef MSDOSFS_DEBUG 711 printf("msdosfs_inactive(): dep %p, refcnt %ld, mntflag %x, MNT_RDONLY %x\n", 712 dep, dep->de_refcnt, vp->v_mount->mnt_flag, MNT_RDONLY); 713 #endif 714 if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 715 error = detrunc(dep, (u_long) 0, 0, NOCRED, td); 716 dep->de_flag |= DE_UPDATE; 717 dep->de_Name[0] = SLOT_DELETED; 718 } 719 deupdat(dep, 0); 720 721 out: 722 VOP_UNLOCK(vp, 0, td); 723 /* 724 * If we are done with the denode, reclaim it 725 * so that it can be reused immediately. 726 */ 727 #ifdef MSDOSFS_DEBUG 728 printf("msdosfs_inactive(): v_usecount %d, de_Name[0] %x\n", vp->v_usecount, 729 dep->de_Name[0]); 730 #endif 731 if (dep->de_Name[0] == SLOT_DELETED) 732 vrecycle(vp, NULL, td); 733 return (error); 734 } 735