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 1.12 2004/04/24 04:32:04 drhodus 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 (dev_t dev, u_long dirclust, 97 u_long diroff); 98 static void msdosfs_hashins (struct denode *dep); 99 static void msdosfs_hashrem (struct denode *dep); 100 101 /*ARGSUSED*/ 102 int 103 msdosfs_init(struct vfsconf *vfsp) 104 { 105 dehashtbl = hashinit(desiredvnodes/2, M_MSDOSFSMNT, &dehash); 106 lwkt_token_init(&dehash_token); 107 return (0); 108 } 109 110 int 111 msdosfs_uninit(struct vfsconf *vfsp) 112 { 113 114 if (dehashtbl) 115 free(dehashtbl, M_MSDOSFSMNT); 116 return (0); 117 } 118 119 static struct denode * 120 msdosfs_hashget(dev_t dev, u_long dirclust, u_long diroff) 121 { 122 struct thread *td = curthread; /* XXX */ 123 struct denode *dep; 124 lwkt_tokref ilock; 125 lwkt_tokref vlock; 126 struct vnode *vp; 127 128 lwkt_gettoken(&ilock, &dehash_token); 129 loop: 130 for (dep = DEHASH(dev, dirclust, diroff); dep; dep = dep->de_next) { 131 if (dirclust != dep->de_dirclust 132 || diroff != dep->de_diroffset 133 || dev != dep->de_dev 134 || dep->de_refcnt == 0) { 135 continue; 136 } 137 vp = DETOV(dep); 138 lwkt_gettoken(&vlock, vp->v_interlock); 139 /* 140 * We must check to see if the inode has been ripped 141 * out from under us after blocking. 142 */ 143 for (dep = DEHASH(dev, dirclust, diroff); dep; dep = dep->de_next) { 144 if (dirclust == dep->de_dirclust 145 && diroff == dep->de_diroffset 146 && dev == dep->de_dev 147 && dep->de_refcnt != 0) { 148 break; 149 } 150 } 151 if (dep == NULL || DETOV(dep) != vp) { 152 lwkt_reltoken(&vlock); 153 goto loop; 154 } 155 if (vget(vp, &vlock, LK_EXCLUSIVE | LK_INTERLOCK, td)) 156 goto loop; 157 lwkt_reltoken(&ilock); 158 return (dep); 159 } 160 lwkt_reltoken(&ilock); 161 return (NULL); 162 } 163 164 static void 165 msdosfs_hashins(struct denode *dep) 166 { 167 struct denode **depp, *deq; 168 lwkt_tokref ilock; 169 170 lwkt_gettoken(&ilock, &dehash_token); 171 depp = &DEHASH(dep->de_dev, dep->de_dirclust, dep->de_diroffset); 172 deq = *depp; 173 if (deq) 174 deq->de_prev = &dep->de_next; 175 dep->de_next = deq; 176 dep->de_prev = depp; 177 *depp = dep; 178 lwkt_reltoken(&ilock); 179 } 180 181 static void 182 msdosfs_hashrem(struct denode *dep) 183 { 184 struct denode *deq; 185 lwkt_tokref ilock; 186 187 lwkt_gettoken(&ilock, &dehash_token); 188 deq = dep->de_next; 189 if (deq) 190 deq->de_prev = dep->de_prev; 191 *dep->de_prev = deq; 192 #ifdef DIAGNOSTIC 193 dep->de_next = NULL; 194 dep->de_prev = NULL; 195 #endif 196 lwkt_reltoken(&ilock); 197 } 198 199 /* 200 * If deget() succeeds it returns with the gotten denode locked(). 201 * 202 * pmp - address of msdosfsmount structure of the filesystem containing 203 * the denode of interest. The pm_dev field and the address of 204 * the msdosfsmount structure are used. 205 * dirclust - which cluster bp contains, if dirclust is 0 (root directory) 206 * diroffset is relative to the beginning of the root directory, 207 * otherwise it is cluster relative. 208 * diroffset - offset past begin of cluster of denode we want 209 * depp - returns the address of the gotten denode. 210 */ 211 int 212 deget(struct msdosfsmount *pmp, /* so we know the maj/min number */ 213 u_long dirclust, /* cluster this dir entry came from */ 214 u_long diroffset, /* index of entry within the cluster */ 215 struct denode **depp) /* returns the addr of the gotten denode */ 216 { 217 struct thread *td = curthread; /* XXX */ 218 int error; 219 dev_t dev = pmp->pm_dev; 220 struct mount *mntp = pmp->pm_mountp; 221 struct direntry *direntptr; 222 struct denode *ldep; 223 struct vnode *nvp; 224 struct buf *bp; 225 struct timeval tv; 226 227 #ifdef MSDOSFS_DEBUG 228 printf("deget(pmp %p, dirclust %lu, diroffset %lx, depp %p)\n", 229 pmp, dirclust, diroffset, depp); 230 #endif 231 232 /* 233 * On FAT32 filesystems, root is a (more or less) normal 234 * directory 235 */ 236 if (FAT32(pmp) && dirclust == MSDOSFSROOT) 237 dirclust = pmp->pm_rootdirblk; 238 239 /* 240 * See if the denode is in the denode cache. Use the location of 241 * the directory entry to compute the hash value. For subdir use 242 * address of "." entry. For root dir (if not FAT32) use cluster 243 * MSDOSFSROOT, offset MSDOSFSROOT_OFS 244 * 245 * NOTE: The check for de_refcnt > 0 below insures the denode being 246 * examined does not represent an unlinked but still open file. 247 * These files are not to be accessible even when the directory 248 * entry that represented the file happens to be reused while the 249 * deleted file is still open. 250 */ 251 ldep = msdosfs_hashget(dev, dirclust, diroffset); 252 if (ldep) { 253 *depp = ldep; 254 return (0); 255 } 256 257 /* 258 * Do the MALLOC before the getnewvnode since doing so afterward 259 * might cause a bogus v_data pointer to get dereferenced 260 * elsewhere if MALLOC should block. 261 */ 262 MALLOC(ldep, struct denode *, sizeof(struct denode), M_MSDOSFSNODE, M_WAITOK); 263 264 /* 265 * Directory entry was not in cache, have to create a vnode and 266 * copy it from the passed disk buffer. 267 */ 268 /* getnewvnode() does a vref() on the vnode */ 269 error = getnewvnode(VT_MSDOSFS, mntp, msdosfs_vnodeop_p, &nvp); 270 if (error) { 271 *depp = NULL; 272 FREE(ldep, M_MSDOSFSNODE); 273 return error; 274 } 275 bzero((caddr_t)ldep, sizeof *ldep); 276 lockinit(&ldep->de_lock, 0, "denode", VLKTIMEOUT, 0); 277 nvp->v_data = ldep; 278 ldep->de_vnode = nvp; 279 ldep->de_flag = 0; 280 ldep->de_devvp = 0; 281 ldep->de_dev = dev; 282 ldep->de_dirclust = dirclust; 283 ldep->de_diroffset = diroffset; 284 fc_purge(ldep, 0); /* init the fat cache for this denode */ 285 286 /* 287 * Lock the denode so that it can't be accessed until we've read 288 * it in and have done what we need to it. Do this here instead 289 * of at the start of msdosfs_hashins() so that reinsert() can 290 * call msdosfs_hashins() with a locked denode. 291 */ 292 if (lockmgr(&ldep->de_lock, LK_EXCLUSIVE, NULL, td)) 293 panic("deget: unexpected lock failure"); 294 295 /* 296 * Insert the denode into the hash queue. 297 */ 298 msdosfs_hashins(ldep); 299 300 ldep->de_pmp = pmp; 301 ldep->de_refcnt = 1; 302 /* 303 * Copy the directory entry into the denode area of the vnode. 304 */ 305 if ((dirclust == MSDOSFSROOT 306 || (FAT32(pmp) && dirclust == pmp->pm_rootdirblk)) 307 && diroffset == MSDOSFSROOT_OFS) { 308 /* 309 * Directory entry for the root directory. There isn't one, 310 * so we manufacture one. We should probably rummage 311 * through the root directory and find a label entry (if it 312 * exists), and then use the time and date from that entry 313 * as the time and date for the root denode. 314 */ 315 nvp->v_flag |= VROOT; /* should be further down XXX */ 316 317 ldep->de_Attributes = ATTR_DIRECTORY; 318 ldep->de_LowerCase = 0; 319 if (FAT32(pmp)) 320 ldep->de_StartCluster = pmp->pm_rootdirblk; 321 /* de_FileSize will be filled in further down */ 322 else { 323 ldep->de_StartCluster = MSDOSFSROOT; 324 ldep->de_FileSize = pmp->pm_rootdirsize * DEV_BSIZE; 325 } 326 /* 327 * fill in time and date so that dos2unixtime() doesn't 328 * spit up when called from msdosfs_getattr() with root 329 * denode 330 */ 331 ldep->de_CHun = 0; 332 ldep->de_CTime = 0x0000; /* 00:00:00 */ 333 ldep->de_CDate = (0 << DD_YEAR_SHIFT) | (1 << DD_MONTH_SHIFT) 334 | (1 << DD_DAY_SHIFT); 335 /* Jan 1, 1980 */ 336 ldep->de_ADate = ldep->de_CDate; 337 ldep->de_MTime = ldep->de_CTime; 338 ldep->de_MDate = ldep->de_CDate; 339 /* leave the other fields as garbage */ 340 } else { 341 error = readep(pmp, dirclust, diroffset, &bp, &direntptr); 342 if (error) { 343 /* 344 * The denode does not contain anything useful, so 345 * it would be wrong to leave it on its hash chain. 346 * Arrange for vput() to just forget about it. 347 */ 348 ldep->de_Name[0] = SLOT_DELETED; 349 350 vput(nvp); 351 *depp = NULL; 352 return (error); 353 } 354 DE_INTERNALIZE(ldep, direntptr); 355 brelse(bp); 356 } 357 358 /* 359 * Fill in a few fields of the vnode and finish filling in the 360 * denode. Then return the address of the found denode. 361 */ 362 if (ldep->de_Attributes & ATTR_DIRECTORY) { 363 /* 364 * Since DOS directory entries that describe directories 365 * have 0 in the filesize field, we take this opportunity 366 * to find out the length of the directory and plug it into 367 * the denode structure. 368 */ 369 u_long size; 370 371 /* 372 * XXX Sometimes, these arrives that . entry have cluster 373 * number 0, when it shouldn't. Use real cluster number 374 * instead of what is written in directory entry. 375 */ 376 if ((diroffset == 0) && (ldep->de_StartCluster != dirclust)) { 377 printf("deget(): . entry at clust %ld != %ld\n", 378 dirclust, ldep->de_StartCluster); 379 ldep->de_StartCluster = dirclust; 380 } 381 382 nvp->v_type = VDIR; 383 if (ldep->de_StartCluster != MSDOSFSROOT) { 384 error = pcbmap(ldep, 0xffff, 0, &size, 0); 385 if (error == E2BIG) { 386 ldep->de_FileSize = de_cn2off(pmp, size); 387 error = 0; 388 } else 389 printf("deget(): pcbmap returned %d\n", error); 390 } 391 } else 392 nvp->v_type = VREG; 393 getmicrouptime(&tv); 394 SETHIGH(ldep->de_modrev, tv.tv_sec); 395 SETLOW(ldep->de_modrev, tv.tv_usec * 4294); 396 ldep->de_devvp = pmp->pm_devvp; 397 vref(ldep->de_devvp); 398 *depp = ldep; 399 return (0); 400 } 401 402 int 403 deupdat(struct denode *dep, int waitfor) 404 { 405 int error; 406 struct buf *bp; 407 struct direntry *dirp; 408 struct timespec ts; 409 410 if (DETOV(dep)->v_mount->mnt_flag & MNT_RDONLY) 411 return (0); 412 getnanotime(&ts); 413 DETIMES(dep, &ts, &ts, &ts); 414 if ((dep->de_flag & DE_MODIFIED) == 0) 415 return (0); 416 dep->de_flag &= ~DE_MODIFIED; 417 if (dep->de_Attributes & ATTR_DIRECTORY) 418 return (0); 419 if (dep->de_refcnt <= 0) 420 return (0); 421 error = readde(dep, &bp, &dirp); 422 if (error) 423 return (error); 424 DE_EXTERNALIZE(dirp, dep); 425 if (waitfor) 426 return (bwrite(bp)); 427 else { 428 bdwrite(bp); 429 return (0); 430 } 431 } 432 433 /* 434 * Truncate the file described by dep to the length specified by length. 435 */ 436 int 437 detrunc(struct denode *dep, u_long length, int flags, struct thread *td) 438 { 439 int error; 440 int allerror; 441 u_long eofentry; 442 u_long chaintofree; 443 daddr_t bn; 444 int boff; 445 int isadir = dep->de_Attributes & ATTR_DIRECTORY; 446 struct buf *bp; 447 struct msdosfsmount *pmp = dep->de_pmp; 448 449 #ifdef MSDOSFS_DEBUG 450 printf("detrunc(): file %s, length %lu, flags %x\n", dep->de_Name, length, flags); 451 #endif 452 453 /* 454 * Disallow attempts to truncate the root directory since it is of 455 * fixed size. That's just the way dos filesystems are. We use 456 * the VROOT bit in the vnode because checking for the directory 457 * bit and a startcluster of 0 in the denode is not adequate to 458 * recognize the root directory at this point in a file or 459 * directory's life. 460 */ 461 if ((DETOV(dep)->v_flag & VROOT) && !FAT32(pmp)) { 462 printf("detrunc(): can't truncate root directory, clust %ld, offset %ld\n", 463 dep->de_dirclust, dep->de_diroffset); 464 return (EINVAL); 465 } 466 467 468 if (dep->de_FileSize < length) { 469 vnode_pager_setsize(DETOV(dep), length); 470 return deextend(dep, length); 471 } 472 473 /* 474 * If the desired length is 0 then remember the starting cluster of 475 * the file and set the StartCluster field in the directory entry 476 * to 0. If the desired length is not zero, then get the number of 477 * the last cluster in the shortened file. Then get the number of 478 * the first cluster in the part of the file that is to be freed. 479 * Then set the next cluster pointer in the last cluster of the 480 * file to CLUST_EOFE. 481 */ 482 if (length == 0) { 483 chaintofree = dep->de_StartCluster; 484 dep->de_StartCluster = 0; 485 eofentry = ~0; 486 } else { 487 error = pcbmap(dep, de_clcount(pmp, length) - 1, 0, 488 &eofentry, 0); 489 if (error) { 490 #ifdef MSDOSFS_DEBUG 491 printf("detrunc(): pcbmap fails %d\n", error); 492 #endif 493 return (error); 494 } 495 } 496 497 fc_purge(dep, de_clcount(pmp, length)); 498 499 /* 500 * If the new length is not a multiple of the cluster size then we 501 * must zero the tail end of the new last cluster in case it 502 * becomes part of the file again because of a seek. 503 */ 504 if ((boff = length & pmp->pm_crbomask) != 0) { 505 if (isadir) { 506 bn = cntobn(pmp, eofentry); 507 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, &bp); 508 } else { 509 bn = de_blk(pmp, length); 510 error = bread(DETOV(dep), bn, pmp->pm_bpcluster, &bp); 511 } 512 if (error) { 513 brelse(bp); 514 #ifdef MSDOSFS_DEBUG 515 printf("detrunc(): bread fails %d\n", error); 516 #endif 517 return (error); 518 } 519 /* 520 * is this the right place for it? 521 */ 522 bzero(bp->b_data + boff, pmp->pm_bpcluster - boff); 523 if (flags & IO_SYNC) 524 bwrite(bp); 525 else 526 bdwrite(bp); 527 } 528 529 /* 530 * Write out the updated directory entry. Even if the update fails 531 * we free the trailing clusters. 532 */ 533 dep->de_FileSize = length; 534 if (!isadir) 535 dep->de_flag |= DE_UPDATE|DE_MODIFIED; 536 allerror = vtruncbuf(DETOV(dep), td, length, pmp->pm_bpcluster); 537 #ifdef MSDOSFS_DEBUG 538 if (allerror) 539 printf("detrunc(): vtruncbuf error %d\n", allerror); 540 #endif 541 error = deupdat(dep, 1); 542 if (error && (allerror == 0)) 543 allerror = error; 544 #ifdef MSDOSFS_DEBUG 545 printf("detrunc(): allerror %d, eofentry %lu\n", 546 allerror, eofentry); 547 #endif 548 549 /* 550 * If we need to break the cluster chain for the file then do it 551 * now. 552 */ 553 if (eofentry != ~0) { 554 error = fatentry(FAT_GET_AND_SET, pmp, eofentry, 555 &chaintofree, CLUST_EOFE); 556 if (error) { 557 #ifdef MSDOSFS_DEBUG 558 printf("detrunc(): fatentry errors %d\n", error); 559 #endif 560 return (error); 561 } 562 fc_setcache(dep, FC_LASTFC, de_cluster(pmp, length - 1), 563 eofentry); 564 } 565 566 /* 567 * Now free the clusters removed from the file because of the 568 * truncation. 569 */ 570 if (chaintofree != 0 && !MSDOSFSEOF(pmp, chaintofree)) 571 freeclusterchain(pmp, chaintofree); 572 573 return (allerror); 574 } 575 576 /* 577 * Extend the file described by dep to length specified by length. 578 */ 579 int 580 deextend(struct denode *dep, u_long length) 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_flag & VROOT) && !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, 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(struct denode *dep) 626 { 627 /* 628 * Fix up the denode cache. If the denode is for a directory, 629 * there is nothing to do since the hash is based on the starting 630 * cluster of the directory file and that hasn't changed. If for a 631 * file the hash is based on the location of the directory entry, 632 * so we must remove it from the cache and re-enter it with the 633 * hash based on the new location of the directory entry. 634 */ 635 if (dep->de_Attributes & ATTR_DIRECTORY) 636 return; 637 msdosfs_hashrem(dep); 638 msdosfs_hashins(dep); 639 } 640 641 /* 642 * msdosfs_reclaim(struct vnode *a_vp) 643 */ 644 int 645 msdosfs_reclaim(struct vop_reclaim_args *ap) 646 { 647 struct vnode *vp = ap->a_vp; 648 struct denode *dep = VTODE(vp); 649 650 #ifdef MSDOSFS_DEBUG 651 printf("msdosfs_reclaim(): dep %p, file %s, refcnt %ld\n", 652 dep, dep->de_Name, dep->de_refcnt); 653 #endif 654 655 if (prtactive && vp->v_usecount != 0) 656 vprint("msdosfs_reclaim(): pushing active", vp); 657 /* 658 * Remove the denode from its hash chain. 659 */ 660 msdosfs_hashrem(dep); 661 /* 662 * Purge old data structures associated with the denode. 663 */ 664 cache_purge(vp); 665 if (dep->de_devvp) { 666 vrele(dep->de_devvp); 667 dep->de_devvp = 0; 668 } 669 #if 0 /* XXX */ 670 dep->de_flag = 0; 671 #endif 672 FREE(dep, M_MSDOSFSNODE); 673 vp->v_data = NULL; 674 675 return (0); 676 } 677 678 /* 679 * msdosfs_inactive(struct vnode *a_vp, struct thread *a_td) 680 */ 681 int 682 msdosfs_inactive(struct vop_inactive_args *ap) 683 { 684 struct vnode *vp = ap->a_vp; 685 struct denode *dep = VTODE(vp); 686 int error = 0; 687 688 #ifdef MSDOSFS_DEBUG 689 printf("msdosfs_inactive(): dep %p, de_Name[0] %x\n", dep, dep->de_Name[0]); 690 #endif 691 692 if (prtactive && vp->v_usecount != 0) 693 vprint("msdosfs_inactive(): pushing active", vp); 694 695 /* 696 * Ignore denodes related to stale file handles. 697 */ 698 if (dep->de_Name[0] == SLOT_DELETED) 699 goto out; 700 701 /* 702 * If the file has been deleted and it is on a read/write 703 * filesystem, then truncate the file, and mark the directory slot 704 * as empty. (This may not be necessary for the dos filesystem.) 705 */ 706 #ifdef MSDOSFS_DEBUG 707 printf("msdosfs_inactive(): dep %p, refcnt %ld, mntflag %x, MNT_RDONLY %x\n", 708 dep, dep->de_refcnt, vp->v_mount->mnt_flag, MNT_RDONLY); 709 #endif 710 if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 711 error = detrunc(dep, (u_long) 0, 0, ap->a_td); 712 dep->de_flag |= DE_UPDATE; 713 dep->de_Name[0] = SLOT_DELETED; 714 } 715 deupdat(dep, 0); 716 717 out: 718 VOP_UNLOCK(vp, NULL, 0, ap->a_td); 719 /* 720 * If we are done with the denode, reclaim it 721 * so that it can be reused immediately. 722 */ 723 #ifdef MSDOSFS_DEBUG 724 printf("msdosfs_inactive(): v_usecount %d, de_Name[0] %x\n", vp->v_usecount, 725 dep->de_Name[0]); 726 #endif 727 if (dep->de_Name[0] == SLOT_DELETED) 728 vrecycle(vp, NULL, ap->a_td); 729 return (error); 730 } 731