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 1.9 2003/10/18 20:15:08 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 (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(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 int gen; 131 132 gen = lwkt_gettoken(&dehash_token); 133 loop: 134 for (dep = DEHASH(dev, dirclust, diroff); dep; dep = dep->de_next) { 135 if (dirclust == dep->de_dirclust 136 && diroff == dep->de_diroffset 137 && dev == dep->de_dev 138 && dep->de_refcnt != 0) { 139 vp = DETOV(dep); 140 lwkt_gettoken(&vp->v_interlock); 141 if (lwkt_gentoken(&dehash_token, &gen) != 0) { 142 lwkt_reltoken(&vp->v_interlock); 143 goto loop; 144 } 145 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) { 146 lwkt_gentoken(&dehash_token, &gen); 147 goto loop; 148 } 149 if (lwkt_reltoken(&dehash_token) != gen) { 150 vput(vp); 151 gen = lwkt_gettoken(&dehash_token); 152 goto loop; 153 } 154 return (dep); 155 } 156 } 157 lwkt_reltoken(&dehash_token); 158 return (NULL); 159 } 160 161 static void 162 msdosfs_hashins(dep) 163 struct denode *dep; 164 { 165 struct denode **depp, *deq; 166 167 lwkt_gettoken(&dehash_token); 168 depp = &DEHASH(dep->de_dev, dep->de_dirclust, dep->de_diroffset); 169 deq = *depp; 170 if (deq) 171 deq->de_prev = &dep->de_next; 172 dep->de_next = deq; 173 dep->de_prev = depp; 174 *depp = dep; 175 lwkt_reltoken(&dehash_token); 176 } 177 178 static void 179 msdosfs_hashrem(dep) 180 struct denode *dep; 181 { 182 struct denode *deq; 183 184 lwkt_gettoken(&dehash_token); 185 deq = dep->de_next; 186 if (deq) 187 deq->de_prev = dep->de_prev; 188 *dep->de_prev = deq; 189 #ifdef DIAGNOSTIC 190 dep->de_next = NULL; 191 dep->de_prev = NULL; 192 #endif 193 lwkt_reltoken(&dehash_token); 194 } 195 196 /* 197 * If deget() succeeds it returns with the gotten denode locked(). 198 * 199 * pmp - address of msdosfsmount structure of the filesystem containing 200 * the denode of interest. The pm_dev field and the address of 201 * the msdosfsmount structure are used. 202 * dirclust - which cluster bp contains, if dirclust is 0 (root directory) 203 * diroffset is relative to the beginning of the root directory, 204 * otherwise it is cluster relative. 205 * diroffset - offset past begin of cluster of denode we want 206 * depp - returns the address of the gotten denode. 207 */ 208 int 209 deget(pmp, dirclust, diroffset, depp) 210 struct msdosfsmount *pmp; /* so we know the maj/min number */ 211 u_long dirclust; /* cluster this dir entry came from */ 212 u_long diroffset; /* index of entry within the cluster */ 213 struct denode **depp; /* returns the addr of the gotten denode */ 214 { 215 struct thread *td = curthread; /* XXX */ 216 int error; 217 dev_t dev = pmp->pm_dev; 218 struct mount *mntp = pmp->pm_mountp; 219 struct direntry *direntptr; 220 struct denode *ldep; 221 struct vnode *nvp; 222 struct buf *bp; 223 struct timeval tv; 224 225 #ifdef MSDOSFS_DEBUG 226 printf("deget(pmp %p, dirclust %lu, diroffset %lx, depp %p)\n", 227 pmp, dirclust, diroffset, depp); 228 #endif 229 230 /* 231 * On FAT32 filesystems, root is a (more or less) normal 232 * directory 233 */ 234 if (FAT32(pmp) && dirclust == MSDOSFSROOT) 235 dirclust = pmp->pm_rootdirblk; 236 237 /* 238 * See if the denode is in the denode cache. Use the location of 239 * the directory entry to compute the hash value. For subdir use 240 * address of "." entry. For root dir (if not FAT32) use cluster 241 * MSDOSFSROOT, offset MSDOSFSROOT_OFS 242 * 243 * NOTE: The check for de_refcnt > 0 below insures the denode being 244 * examined does not represent an unlinked but still open file. 245 * These files are not to be accessible even when the directory 246 * entry that represented the file happens to be reused while the 247 * deleted file is still open. 248 */ 249 ldep = msdosfs_hashget(dev, dirclust, diroffset); 250 if (ldep) { 251 *depp = ldep; 252 return (0); 253 } 254 255 /* 256 * Do the MALLOC before the getnewvnode since doing so afterward 257 * might cause a bogus v_data pointer to get dereferenced 258 * elsewhere if MALLOC should block. 259 */ 260 MALLOC(ldep, struct denode *, sizeof(struct denode), M_MSDOSFSNODE, M_WAITOK); 261 262 /* 263 * Directory entry was not in cache, have to create a vnode and 264 * copy it from the passed disk buffer. 265 */ 266 /* getnewvnode() does a VREF() on the vnode */ 267 error = getnewvnode(VT_MSDOSFS, mntp, msdosfs_vnodeop_p, &nvp); 268 if (error) { 269 *depp = NULL; 270 FREE(ldep, M_MSDOSFSNODE); 271 return error; 272 } 273 bzero((caddr_t)ldep, sizeof *ldep); 274 lockinit(&ldep->de_lock, 0, "denode", VLKTIMEOUT, 0); 275 nvp->v_data = ldep; 276 ldep->de_vnode = nvp; 277 ldep->de_flag = 0; 278 ldep->de_devvp = 0; 279 ldep->de_dev = dev; 280 ldep->de_dirclust = dirclust; 281 ldep->de_diroffset = diroffset; 282 fc_purge(ldep, 0); /* init the fat cache for this denode */ 283 284 /* 285 * Lock the denode so that it can't be accessed until we've read 286 * it in and have done what we need to it. Do this here instead 287 * of at the start of msdosfs_hashins() so that reinsert() can 288 * call msdosfs_hashins() with a locked denode. 289 */ 290 if (lockmgr(&ldep->de_lock, LK_EXCLUSIVE, NULL, td)) 291 panic("deget: unexpected lock failure"); 292 293 /* 294 * Insert the denode into the hash queue. 295 */ 296 msdosfs_hashins(ldep); 297 298 ldep->de_pmp = pmp; 299 ldep->de_refcnt = 1; 300 /* 301 * Copy the directory entry into the denode area of the vnode. 302 */ 303 if ((dirclust == MSDOSFSROOT 304 || (FAT32(pmp) && dirclust == pmp->pm_rootdirblk)) 305 && diroffset == MSDOSFSROOT_OFS) { 306 /* 307 * Directory entry for the root directory. There isn't one, 308 * so we manufacture one. We should probably rummage 309 * through the root directory and find a label entry (if it 310 * exists), and then use the time and date from that entry 311 * as the time and date for the root denode. 312 */ 313 nvp->v_flag |= VROOT; /* should be further down XXX */ 314 315 ldep->de_Attributes = ATTR_DIRECTORY; 316 ldep->de_LowerCase = 0; 317 if (FAT32(pmp)) 318 ldep->de_StartCluster = pmp->pm_rootdirblk; 319 /* de_FileSize will be filled in further down */ 320 else { 321 ldep->de_StartCluster = MSDOSFSROOT; 322 ldep->de_FileSize = pmp->pm_rootdirsize * DEV_BSIZE; 323 } 324 /* 325 * fill in time and date so that dos2unixtime() doesn't 326 * spit up when called from msdosfs_getattr() with root 327 * denode 328 */ 329 ldep->de_CHun = 0; 330 ldep->de_CTime = 0x0000; /* 00:00:00 */ 331 ldep->de_CDate = (0 << DD_YEAR_SHIFT) | (1 << DD_MONTH_SHIFT) 332 | (1 << DD_DAY_SHIFT); 333 /* Jan 1, 1980 */ 334 ldep->de_ADate = ldep->de_CDate; 335 ldep->de_MTime = ldep->de_CTime; 336 ldep->de_MDate = ldep->de_CDate; 337 /* leave the other fields as garbage */ 338 } else { 339 error = readep(pmp, dirclust, diroffset, &bp, &direntptr); 340 if (error) { 341 /* 342 * The denode does not contain anything useful, so 343 * it would be wrong to leave it on its hash chain. 344 * Arrange for vput() to just forget about it. 345 */ 346 ldep->de_Name[0] = SLOT_DELETED; 347 348 vput(nvp); 349 *depp = NULL; 350 return (error); 351 } 352 DE_INTERNALIZE(ldep, direntptr); 353 brelse(bp); 354 } 355 356 /* 357 * Fill in a few fields of the vnode and finish filling in the 358 * denode. Then return the address of the found denode. 359 */ 360 if (ldep->de_Attributes & ATTR_DIRECTORY) { 361 /* 362 * Since DOS directory entries that describe directories 363 * have 0 in the filesize field, we take this opportunity 364 * to find out the length of the directory and plug it into 365 * the denode structure. 366 */ 367 u_long size; 368 369 /* 370 * XXX Sometimes, these arrives that . entry have cluster 371 * number 0, when it shouldn't. Use real cluster number 372 * instead of what is written in directory entry. 373 */ 374 if ((diroffset == 0) && (ldep->de_StartCluster != dirclust)) { 375 printf("deget(): . entry at clust %ld != %ld\n", 376 dirclust, ldep->de_StartCluster); 377 ldep->de_StartCluster = dirclust; 378 } 379 380 nvp->v_type = VDIR; 381 if (ldep->de_StartCluster != MSDOSFSROOT) { 382 error = pcbmap(ldep, 0xffff, 0, &size, 0); 383 if (error == E2BIG) { 384 ldep->de_FileSize = de_cn2off(pmp, size); 385 error = 0; 386 } else 387 printf("deget(): pcbmap returned %d\n", error); 388 } 389 } else 390 nvp->v_type = VREG; 391 getmicrouptime(&tv); 392 SETHIGH(ldep->de_modrev, tv.tv_sec); 393 SETLOW(ldep->de_modrev, tv.tv_usec * 4294); 394 ldep->de_devvp = pmp->pm_devvp; 395 VREF(ldep->de_devvp); 396 *depp = ldep; 397 return (0); 398 } 399 400 int 401 deupdat(dep, waitfor) 402 struct denode *dep; 403 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(dep, length, flags, td) 438 struct denode *dep; 439 u_long length; 440 int flags; 441 struct thread *td; 442 { 443 int error; 444 int allerror; 445 u_long eofentry; 446 u_long chaintofree; 447 daddr_t bn; 448 int boff; 449 int isadir = dep->de_Attributes & ATTR_DIRECTORY; 450 struct buf *bp; 451 struct msdosfsmount *pmp = dep->de_pmp; 452 453 #ifdef MSDOSFS_DEBUG 454 printf("detrunc(): file %s, length %lu, flags %x\n", dep->de_Name, length, flags); 455 #endif 456 457 /* 458 * Disallow attempts to truncate the root directory since it is of 459 * fixed size. That's just the way dos filesystems are. We use 460 * the VROOT bit in the vnode because checking for the directory 461 * bit and a startcluster of 0 in the denode is not adequate to 462 * recognize the root directory at this point in a file or 463 * directory's life. 464 */ 465 if ((DETOV(dep)->v_flag & VROOT) && !FAT32(pmp)) { 466 printf("detrunc(): can't truncate root directory, clust %ld, offset %ld\n", 467 dep->de_dirclust, dep->de_diroffset); 468 return (EINVAL); 469 } 470 471 472 if (dep->de_FileSize < length) { 473 vnode_pager_setsize(DETOV(dep), length); 474 return deextend(dep, length); 475 } 476 477 /* 478 * If the desired length is 0 then remember the starting cluster of 479 * the file and set the StartCluster field in the directory entry 480 * to 0. If the desired length is not zero, then get the number of 481 * the last cluster in the shortened file. Then get the number of 482 * the first cluster in the part of the file that is to be freed. 483 * Then set the next cluster pointer in the last cluster of the 484 * file to CLUST_EOFE. 485 */ 486 if (length == 0) { 487 chaintofree = dep->de_StartCluster; 488 dep->de_StartCluster = 0; 489 eofentry = ~0; 490 } else { 491 error = pcbmap(dep, de_clcount(pmp, length) - 1, 0, 492 &eofentry, 0); 493 if (error) { 494 #ifdef MSDOSFS_DEBUG 495 printf("detrunc(): pcbmap fails %d\n", error); 496 #endif 497 return (error); 498 } 499 } 500 501 fc_purge(dep, de_clcount(pmp, length)); 502 503 /* 504 * If the new length is not a multiple of the cluster size then we 505 * must zero the tail end of the new last cluster in case it 506 * becomes part of the file again because of a seek. 507 */ 508 if ((boff = length & pmp->pm_crbomask) != 0) { 509 if (isadir) { 510 bn = cntobn(pmp, eofentry); 511 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, &bp); 512 } else { 513 bn = de_blk(pmp, length); 514 error = bread(DETOV(dep), bn, pmp->pm_bpcluster, &bp); 515 } 516 if (error) { 517 brelse(bp); 518 #ifdef MSDOSFS_DEBUG 519 printf("detrunc(): bread fails %d\n", error); 520 #endif 521 return (error); 522 } 523 /* 524 * is this the right place for it? 525 */ 526 bzero(bp->b_data + boff, pmp->pm_bpcluster - boff); 527 if (flags & IO_SYNC) 528 bwrite(bp); 529 else 530 bdwrite(bp); 531 } 532 533 /* 534 * Write out the updated directory entry. Even if the update fails 535 * we free the trailing clusters. 536 */ 537 dep->de_FileSize = length; 538 if (!isadir) 539 dep->de_flag |= DE_UPDATE|DE_MODIFIED; 540 allerror = vtruncbuf(DETOV(dep), td, length, pmp->pm_bpcluster); 541 #ifdef MSDOSFS_DEBUG 542 if (allerror) 543 printf("detrunc(): vtruncbuf error %d\n", allerror); 544 #endif 545 error = deupdat(dep, 1); 546 if (error && (allerror == 0)) 547 allerror = error; 548 #ifdef MSDOSFS_DEBUG 549 printf("detrunc(): allerror %d, eofentry %lu\n", 550 allerror, eofentry); 551 #endif 552 553 /* 554 * If we need to break the cluster chain for the file then do it 555 * now. 556 */ 557 if (eofentry != ~0) { 558 error = fatentry(FAT_GET_AND_SET, pmp, eofentry, 559 &chaintofree, CLUST_EOFE); 560 if (error) { 561 #ifdef MSDOSFS_DEBUG 562 printf("detrunc(): fatentry errors %d\n", error); 563 #endif 564 return (error); 565 } 566 fc_setcache(dep, FC_LASTFC, de_cluster(pmp, length - 1), 567 eofentry); 568 } 569 570 /* 571 * Now free the clusters removed from the file because of the 572 * truncation. 573 */ 574 if (chaintofree != 0 && !MSDOSFSEOF(pmp, chaintofree)) 575 freeclusterchain(pmp, chaintofree); 576 577 return (allerror); 578 } 579 580 /* 581 * Extend the file described by dep to length specified by length. 582 */ 583 int 584 deextend(dep, length) 585 struct denode *dep; 586 u_long length; 587 { 588 struct msdosfsmount *pmp = dep->de_pmp; 589 u_long count; 590 int error; 591 592 /* 593 * The root of a DOS filesystem cannot be extended. 594 */ 595 if ((DETOV(dep)->v_flag & VROOT) && !FAT32(pmp)) 596 return (EINVAL); 597 598 /* 599 * Directories cannot be extended. 600 */ 601 if (dep->de_Attributes & ATTR_DIRECTORY) 602 return (EISDIR); 603 604 if (length <= dep->de_FileSize) 605 panic("deextend: file too large"); 606 607 /* 608 * Compute the number of clusters to allocate. 609 */ 610 count = de_clcount(pmp, length) - de_clcount(pmp, dep->de_FileSize); 611 if (count > 0) { 612 if (count > pmp->pm_freeclustercount) 613 return (ENOSPC); 614 error = extendfile(dep, count, NULL, NULL, DE_CLEAR); 615 if (error) { 616 /* truncate the added clusters away again */ 617 (void) detrunc(dep, dep->de_FileSize, 0, NULL); 618 return (error); 619 } 620 } 621 dep->de_FileSize = length; 622 dep->de_flag |= DE_UPDATE|DE_MODIFIED; 623 return (deupdat(dep, 1)); 624 } 625 626 /* 627 * Move a denode to its correct hash queue after the file it represents has 628 * been moved to a new directory. 629 */ 630 void 631 reinsert(dep) 632 struct denode *dep; 633 { 634 /* 635 * Fix up the denode cache. If the denode is for a directory, 636 * there is nothing to do since the hash is based on the starting 637 * cluster of the directory file and that hasn't changed. If for a 638 * file the hash is based on the location of the directory entry, 639 * so we must remove it from the cache and re-enter it with the 640 * hash based on the new location of the directory entry. 641 */ 642 if (dep->de_Attributes & ATTR_DIRECTORY) 643 return; 644 msdosfs_hashrem(dep); 645 msdosfs_hashins(dep); 646 } 647 648 int 649 msdosfs_reclaim(ap) 650 struct vop_reclaim_args /* { 651 struct vnode *a_vp; 652 } */ *ap; 653 { 654 struct vnode *vp = ap->a_vp; 655 struct denode *dep = VTODE(vp); 656 657 #ifdef MSDOSFS_DEBUG 658 printf("msdosfs_reclaim(): dep %p, file %s, refcnt %ld\n", 659 dep, dep->de_Name, dep->de_refcnt); 660 #endif 661 662 if (prtactive && vp->v_usecount != 0) 663 vprint("msdosfs_reclaim(): pushing active", vp); 664 /* 665 * Remove the denode from its hash chain. 666 */ 667 msdosfs_hashrem(dep); 668 /* 669 * Purge old data structures associated with the denode. 670 */ 671 cache_purge(vp); 672 if (dep->de_devvp) { 673 vrele(dep->de_devvp); 674 dep->de_devvp = 0; 675 } 676 #if 0 /* XXX */ 677 dep->de_flag = 0; 678 #endif 679 FREE(dep, M_MSDOSFSNODE); 680 vp->v_data = NULL; 681 682 return (0); 683 } 684 685 int 686 msdosfs_inactive(ap) 687 struct vop_inactive_args /* { 688 struct vnode *a_vp; 689 struct thread *a_td; 690 } */ *ap; 691 { 692 struct vnode *vp = ap->a_vp; 693 struct denode *dep = VTODE(vp); 694 int error = 0; 695 696 #ifdef MSDOSFS_DEBUG 697 printf("msdosfs_inactive(): dep %p, de_Name[0] %x\n", dep, dep->de_Name[0]); 698 #endif 699 700 if (prtactive && vp->v_usecount != 0) 701 vprint("msdosfs_inactive(): pushing active", vp); 702 703 /* 704 * Ignore denodes related to stale file handles. 705 */ 706 if (dep->de_Name[0] == SLOT_DELETED) 707 goto out; 708 709 /* 710 * If the file has been deleted and it is on a read/write 711 * filesystem, then truncate the file, and mark the directory slot 712 * as empty. (This may not be necessary for the dos filesystem.) 713 */ 714 #ifdef MSDOSFS_DEBUG 715 printf("msdosfs_inactive(): dep %p, refcnt %ld, mntflag %x, MNT_RDONLY %x\n", 716 dep, dep->de_refcnt, vp->v_mount->mnt_flag, MNT_RDONLY); 717 #endif 718 if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 719 error = detrunc(dep, (u_long) 0, 0, ap->a_td); 720 dep->de_flag |= DE_UPDATE; 721 dep->de_Name[0] = SLOT_DELETED; 722 } 723 deupdat(dep, 0); 724 725 out: 726 VOP_UNLOCK(vp, 0, ap->a_td); 727 /* 728 * If we are done with the denode, reclaim it 729 * so that it can be reused immediately. 730 */ 731 #ifdef MSDOSFS_DEBUG 732 printf("msdosfs_inactive(): v_usecount %d, de_Name[0] %x\n", vp->v_usecount, 733 dep->de_Name[0]); 734 #endif 735 if (dep->de_Name[0] == SLOT_DELETED) 736 vrecycle(vp, NULL, ap->a_td); 737 return (error); 738 } 739