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 60 #include <vm/vm.h> 61 #include <vm/vm_extern.h> 62 63 #include <machine/mutex.h> 64 65 #include <msdosfs/bpb.h> 66 #include <msdosfs/msdosfsmount.h> 67 #include <msdosfs/direntry.h> 68 #include <msdosfs/denode.h> 69 #include <msdosfs/fat.h> 70 71 static MALLOC_DEFINE(M_MSDOSFSNODE, "MSDOSFS node", "MSDOSFS vnode private part"); 72 73 static struct denode **dehashtbl; 74 static u_long dehash; /* size of hash table - 1 */ 75 #define DEHASH(dev, dcl, doff) (dehashtbl[(minor(dev) + (dcl) + (doff) / \ 76 sizeof(struct direntry)) & dehash]) 77 #ifndef NULL_SIMPLELOCKS 78 static struct simplelock dehash_slock; 79 #endif 80 81 union _qcvt { 82 quad_t qcvt; 83 long val[2]; 84 }; 85 #define SETHIGH(q, h) { \ 86 union _qcvt tmp; \ 87 tmp.qcvt = (q); \ 88 tmp.val[_QUAD_HIGHWORD] = (h); \ 89 (q) = tmp.qcvt; \ 90 } 91 #define SETLOW(q, l) { \ 92 union _qcvt tmp; \ 93 tmp.qcvt = (q); \ 94 tmp.val[_QUAD_LOWWORD] = (l); \ 95 (q) = tmp.qcvt; \ 96 } 97 98 static struct denode * 99 msdosfs_hashget __P((dev_t dev, u_long dirclust, 100 u_long diroff)); 101 static void msdosfs_hashins __P((struct denode *dep)); 102 static void msdosfs_hashrem __P((struct denode *dep)); 103 104 /*ARGSUSED*/ 105 int 106 msdosfs_init(vfsp) 107 struct vfsconf *vfsp; 108 { 109 dehashtbl = hashinit(desiredvnodes/2, M_MSDOSFSMNT, &dehash); 110 simple_lock_init(&dehash_slock); 111 return (0); 112 } 113 114 int 115 msdosfs_uninit(vfsp) 116 struct vfsconf *vfsp; 117 { 118 119 if (dehashtbl) 120 free(dehashtbl, M_MSDOSFSMNT); 121 return (0); 122 } 123 124 static struct denode * 125 msdosfs_hashget(dev, dirclust, diroff) 126 dev_t dev; 127 u_long dirclust; 128 u_long diroff; 129 { 130 struct proc *p = curproc; /* XXX */ 131 struct denode *dep; 132 struct vnode *vp; 133 134 loop: 135 simple_lock(&dehash_slock); 136 for (dep = DEHASH(dev, dirclust, diroff); dep; dep = dep->de_next) { 137 if (dirclust == dep->de_dirclust 138 && diroff == dep->de_diroffset 139 && dev == dep->de_dev 140 && dep->de_refcnt != 0) { 141 vp = DETOV(dep); 142 mtx_enter(&vp->v_interlock, MTX_DEF); 143 simple_unlock(&dehash_slock); 144 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, p)) 145 goto loop; 146 return (dep); 147 } 148 } 149 simple_unlock(&dehash_slock); 150 return (NULL); 151 } 152 153 static void 154 msdosfs_hashins(dep) 155 struct denode *dep; 156 { 157 struct denode **depp, *deq; 158 159 simple_lock(&dehash_slock); 160 depp = &DEHASH(dep->de_dev, dep->de_dirclust, dep->de_diroffset); 161 deq = *depp; 162 if (deq) 163 deq->de_prev = &dep->de_next; 164 dep->de_next = deq; 165 dep->de_prev = depp; 166 *depp = dep; 167 simple_unlock(&dehash_slock); 168 } 169 170 static void 171 msdosfs_hashrem(dep) 172 struct denode *dep; 173 { 174 struct denode *deq; 175 176 simple_lock(&dehash_slock); 177 deq = dep->de_next; 178 if (deq) 179 deq->de_prev = dep->de_prev; 180 *dep->de_prev = deq; 181 #ifdef DIAGNOSTIC 182 dep->de_next = NULL; 183 dep->de_prev = NULL; 184 #endif 185 simple_unlock(&dehash_slock); 186 } 187 188 /* 189 * If deget() succeeds it returns with the gotten denode locked(). 190 * 191 * pmp - address of msdosfsmount structure of the filesystem containing 192 * the denode of interest. The pm_dev field and the address of 193 * the msdosfsmount structure are used. 194 * dirclust - which cluster bp contains, if dirclust is 0 (root directory) 195 * diroffset is relative to the beginning of the root directory, 196 * otherwise it is cluster relative. 197 * diroffset - offset past begin of cluster of denode we want 198 * depp - returns the address of the gotten denode. 199 */ 200 int 201 deget(pmp, dirclust, diroffset, depp) 202 struct msdosfsmount *pmp; /* so we know the maj/min number */ 203 u_long dirclust; /* cluster this dir entry came from */ 204 u_long diroffset; /* index of entry within the cluster */ 205 struct denode **depp; /* returns the addr of the gotten denode */ 206 { 207 int error; 208 dev_t dev = pmp->pm_dev; 209 struct mount *mntp = pmp->pm_mountp; 210 struct direntry *direntptr; 211 struct denode *ldep; 212 struct vnode *nvp; 213 struct buf *bp; 214 struct proc *p = curproc; /* XXX */ 215 struct timeval tv; 216 217 #ifdef MSDOSFS_DEBUG 218 printf("deget(pmp %p, dirclust %lu, diroffset %lx, depp %p)\n", 219 pmp, dirclust, diroffset, depp); 220 #endif 221 222 /* 223 * On FAT32 filesystems, root is a (more or less) normal 224 * directory 225 */ 226 if (FAT32(pmp) && dirclust == MSDOSFSROOT) 227 dirclust = pmp->pm_rootdirblk; 228 229 /* 230 * See if the denode is in the denode cache. Use the location of 231 * the directory entry to compute the hash value. For subdir use 232 * address of "." entry. For root dir (if not FAT32) use cluster 233 * MSDOSFSROOT, offset MSDOSFSROOT_OFS 234 * 235 * NOTE: The check for de_refcnt > 0 below insures the denode being 236 * examined does not represent an unlinked but still open file. 237 * These files are not to be accessible even when the directory 238 * entry that represented the file happens to be reused while the 239 * deleted file is still open. 240 */ 241 ldep = msdosfs_hashget(dev, dirclust, diroffset); 242 if (ldep) { 243 *depp = ldep; 244 return (0); 245 } 246 247 /* 248 * Do the MALLOC before the getnewvnode since doing so afterward 249 * might cause a bogus v_data pointer to get dereferenced 250 * elsewhere if MALLOC should block. 251 */ 252 MALLOC(ldep, struct denode *, sizeof(struct denode), M_MSDOSFSNODE, M_WAITOK); 253 254 /* 255 * Directory entry was not in cache, have to create a vnode and 256 * copy it from the passed disk buffer. 257 */ 258 /* getnewvnode() does a VREF() on the vnode */ 259 error = getnewvnode(VT_MSDOSFS, mntp, msdosfs_vnodeop_p, &nvp); 260 if (error) { 261 *depp = NULL; 262 FREE(ldep, M_MSDOSFSNODE); 263 return error; 264 } 265 bzero((caddr_t)ldep, sizeof *ldep); 266 lockinit(&nvp->v_lock, PINOD, "denode", 0, 0); 267 nvp->v_vnlock = &nvp->v_lock; 268 nvp->v_data = ldep; 269 ldep->de_vnode = nvp; 270 ldep->de_flag = 0; 271 ldep->de_devvp = 0; 272 ldep->de_dev = dev; 273 ldep->de_dirclust = dirclust; 274 ldep->de_diroffset = diroffset; 275 fc_purge(ldep, 0); /* init the fat cache for this denode */ 276 277 /* 278 * Lock the denode so that it can't be accessed until we've read 279 * it in and have done what we need to it. Do this here instead 280 * of at the start of msdosfs_hashins() so that reinsert() can 281 * call msdosfs_hashins() with a locked denode. 282 */ 283 if (VOP_LOCK(nvp, LK_EXCLUSIVE, p) != 0) 284 panic("deget: unexpected lock failure"); 285 286 /* 287 * Insert the denode into the hash queue. 288 */ 289 msdosfs_hashins(ldep); 290 291 ldep->de_pmp = pmp; 292 ldep->de_refcnt = 1; 293 /* 294 * Copy the directory entry into the denode area of the vnode. 295 */ 296 if ((dirclust == MSDOSFSROOT 297 || (FAT32(pmp) && dirclust == pmp->pm_rootdirblk)) 298 && diroffset == MSDOSFSROOT_OFS) { 299 /* 300 * Directory entry for the root directory. There isn't one, 301 * so we manufacture one. We should probably rummage 302 * through the root directory and find a label entry (if it 303 * exists), and then use the time and date from that entry 304 * as the time and date for the root denode. 305 */ 306 nvp->v_flag |= VROOT; /* should be further down XXX */ 307 308 ldep->de_Attributes = ATTR_DIRECTORY; 309 ldep->de_LowerCase = 0; 310 if (FAT32(pmp)) 311 ldep->de_StartCluster = pmp->pm_rootdirblk; 312 /* de_FileSize will be filled in further down */ 313 else { 314 ldep->de_StartCluster = MSDOSFSROOT; 315 ldep->de_FileSize = pmp->pm_rootdirsize * DEV_BSIZE; 316 } 317 /* 318 * fill in time and date so that dos2unixtime() doesn't 319 * spit up when called from msdosfs_getattr() with root 320 * denode 321 */ 322 ldep->de_CHun = 0; 323 ldep->de_CTime = 0x0000; /* 00:00:00 */ 324 ldep->de_CDate = (0 << DD_YEAR_SHIFT) | (1 << DD_MONTH_SHIFT) 325 | (1 << DD_DAY_SHIFT); 326 /* Jan 1, 1980 */ 327 ldep->de_ADate = ldep->de_CDate; 328 ldep->de_MTime = ldep->de_CTime; 329 ldep->de_MDate = ldep->de_CDate; 330 /* leave the other fields as garbage */ 331 } else { 332 error = readep(pmp, dirclust, diroffset, &bp, &direntptr); 333 if (error) { 334 /* 335 * The denode does not contain anything useful, so 336 * it would be wrong to leave it on its hash chain. 337 * Arrange for vput() to just forget about it. 338 */ 339 ldep->de_Name[0] = SLOT_DELETED; 340 341 vput(nvp); 342 *depp = NULL; 343 return (error); 344 } 345 DE_INTERNALIZE(ldep, direntptr); 346 brelse(bp); 347 } 348 349 /* 350 * Fill in a few fields of the vnode and finish filling in the 351 * denode. Then return the address of the found denode. 352 */ 353 if (ldep->de_Attributes & ATTR_DIRECTORY) { 354 /* 355 * Since DOS directory entries that describe directories 356 * have 0 in the filesize field, we take this opportunity 357 * to find out the length of the directory and plug it into 358 * the denode structure. 359 */ 360 u_long size; 361 362 nvp->v_type = VDIR; 363 if (ldep->de_StartCluster != MSDOSFSROOT) { 364 error = pcbmap(ldep, 0xffff, 0, &size, 0); 365 if (error == E2BIG) { 366 ldep->de_FileSize = de_cn2off(pmp, size); 367 error = 0; 368 } else 369 printf("deget(): pcbmap returned %d\n", error); 370 } 371 } else 372 nvp->v_type = VREG; 373 getmicrouptime(&tv); 374 SETHIGH(ldep->de_modrev, tv.tv_sec); 375 SETLOW(ldep->de_modrev, tv.tv_usec * 4294); 376 ldep->de_devvp = pmp->pm_devvp; 377 VREF(ldep->de_devvp); 378 *depp = ldep; 379 return (0); 380 } 381 382 int 383 deupdat(dep, waitfor) 384 struct denode *dep; 385 int waitfor; 386 { 387 int error; 388 struct buf *bp; 389 struct direntry *dirp; 390 struct timespec ts; 391 392 if (DETOV(dep)->v_mount->mnt_flag & MNT_RDONLY) 393 return (0); 394 getnanotime(&ts); 395 DETIMES(dep, &ts, &ts, &ts); 396 if ((dep->de_flag & DE_MODIFIED) == 0) 397 return (0); 398 dep->de_flag &= ~DE_MODIFIED; 399 if (dep->de_Attributes & ATTR_DIRECTORY) 400 return (0); 401 if (dep->de_refcnt <= 0) 402 return (0); 403 error = readde(dep, &bp, &dirp); 404 if (error) 405 return (error); 406 DE_EXTERNALIZE(dirp, dep); 407 if (waitfor) 408 return (bwrite(bp)); 409 else { 410 bdwrite(bp); 411 return (0); 412 } 413 } 414 415 /* 416 * Truncate the file described by dep to the length specified by length. 417 */ 418 int 419 detrunc(dep, length, flags, cred, p) 420 struct denode *dep; 421 u_long length; 422 int flags; 423 struct ucred *cred; 424 struct proc *p; 425 { 426 int error; 427 int allerror; 428 u_long eofentry; 429 u_long chaintofree; 430 daddr_t bn; 431 int boff; 432 int isadir = dep->de_Attributes & ATTR_DIRECTORY; 433 struct buf *bp; 434 struct msdosfsmount *pmp = dep->de_pmp; 435 436 #ifdef MSDOSFS_DEBUG 437 printf("detrunc(): file %s, length %lu, flags %x\n", dep->de_Name, length, flags); 438 #endif 439 440 /* 441 * Disallow attempts to truncate the root directory since it is of 442 * fixed size. That's just the way dos filesystems are. We use 443 * the VROOT bit in the vnode because checking for the directory 444 * bit and a startcluster of 0 in the denode is not adequate to 445 * recognize the root directory at this point in a file or 446 * directory's life. 447 */ 448 if ((DETOV(dep)->v_flag & VROOT) && !FAT32(pmp)) { 449 printf("detrunc(): can't truncate root directory, clust %ld, offset %ld\n", 450 dep->de_dirclust, dep->de_diroffset); 451 return (EINVAL); 452 } 453 454 455 if (dep->de_FileSize < length) { 456 vnode_pager_setsize(DETOV(dep), length); 457 return deextend(dep, length, cred); 458 } 459 460 /* 461 * If the desired length is 0 then remember the starting cluster of 462 * the file and set the StartCluster field in the directory entry 463 * to 0. If the desired length is not zero, then get the number of 464 * the last cluster in the shortened file. Then get the number of 465 * the first cluster in the part of the file that is to be freed. 466 * Then set the next cluster pointer in the last cluster of the 467 * file to CLUST_EOFE. 468 */ 469 if (length == 0) { 470 chaintofree = dep->de_StartCluster; 471 dep->de_StartCluster = 0; 472 eofentry = ~0; 473 } else { 474 error = pcbmap(dep, de_clcount(pmp, length) - 1, 0, 475 &eofentry, 0); 476 if (error) { 477 #ifdef MSDOSFS_DEBUG 478 printf("detrunc(): pcbmap fails %d\n", error); 479 #endif 480 return (error); 481 } 482 } 483 484 fc_purge(dep, de_clcount(pmp, length)); 485 486 /* 487 * If the new length is not a multiple of the cluster size then we 488 * must zero the tail end of the new last cluster in case it 489 * becomes part of the file again because of a seek. 490 */ 491 if ((boff = length & pmp->pm_crbomask) != 0) { 492 if (isadir) { 493 bn = cntobn(pmp, eofentry); 494 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, 495 NOCRED, &bp); 496 } else { 497 bn = de_blk(pmp, length); 498 error = bread(DETOV(dep), bn, pmp->pm_bpcluster, 499 NOCRED, &bp); 500 } 501 if (error) { 502 brelse(bp); 503 #ifdef MSDOSFS_DEBUG 504 printf("detrunc(): bread fails %d\n", error); 505 #endif 506 return (error); 507 } 508 /* 509 * is this the right place for it? 510 */ 511 bzero(bp->b_data + boff, pmp->pm_bpcluster - boff); 512 if (flags & IO_SYNC) 513 bwrite(bp); 514 else 515 bdwrite(bp); 516 } 517 518 /* 519 * Write out the updated directory entry. Even if the update fails 520 * we free the trailing clusters. 521 */ 522 dep->de_FileSize = length; 523 if (!isadir) 524 dep->de_flag |= DE_UPDATE|DE_MODIFIED; 525 allerror = vtruncbuf(DETOV(dep), cred, p, length, pmp->pm_bpcluster); 526 #ifdef MSDOSFS_DEBUG 527 if (allerror) 528 printf("detrunc(): vtruncbuf error %d\n", allerror); 529 #endif 530 error = deupdat(dep, 1); 531 if (error && (allerror == 0)) 532 allerror = error; 533 #ifdef MSDOSFS_DEBUG 534 printf("detrunc(): allerror %d, eofentry %lu\n", 535 allerror, eofentry); 536 #endif 537 538 /* 539 * If we need to break the cluster chain for the file then do it 540 * now. 541 */ 542 if (eofentry != ~0) { 543 error = fatentry(FAT_GET_AND_SET, pmp, eofentry, 544 &chaintofree, CLUST_EOFE); 545 if (error) { 546 #ifdef MSDOSFS_DEBUG 547 printf("detrunc(): fatentry errors %d\n", error); 548 #endif 549 return (error); 550 } 551 fc_setcache(dep, FC_LASTFC, de_cluster(pmp, length - 1), 552 eofentry); 553 } 554 555 /* 556 * Now free the clusters removed from the file because of the 557 * truncation. 558 */ 559 if (chaintofree != 0 && !MSDOSFSEOF(pmp, chaintofree)) 560 freeclusterchain(pmp, chaintofree); 561 562 return (allerror); 563 } 564 565 /* 566 * Extend the file described by dep to length specified by length. 567 */ 568 int 569 deextend(dep, length, cred) 570 struct denode *dep; 571 u_long length; 572 struct ucred *cred; 573 { 574 struct msdosfsmount *pmp = dep->de_pmp; 575 u_long count; 576 int error; 577 578 /* 579 * The root of a DOS filesystem cannot be extended. 580 */ 581 if ((DETOV(dep)->v_flag & VROOT) && !FAT32(pmp)) 582 return (EINVAL); 583 584 /* 585 * Directories cannot be extended. 586 */ 587 if (dep->de_Attributes & ATTR_DIRECTORY) 588 return (EISDIR); 589 590 if (length <= dep->de_FileSize) 591 panic("deextend: file too large"); 592 593 /* 594 * Compute the number of clusters to allocate. 595 */ 596 count = de_clcount(pmp, length) - de_clcount(pmp, dep->de_FileSize); 597 if (count > 0) { 598 if (count > pmp->pm_freeclustercount) 599 return (ENOSPC); 600 error = extendfile(dep, count, NULL, NULL, DE_CLEAR); 601 if (error) { 602 /* truncate the added clusters away again */ 603 (void) detrunc(dep, dep->de_FileSize, 0, cred, NULL); 604 return (error); 605 } 606 } 607 dep->de_FileSize = length; 608 dep->de_flag |= DE_UPDATE|DE_MODIFIED; 609 return (deupdat(dep, 1)); 610 } 611 612 /* 613 * Move a denode to its correct hash queue after the file it represents has 614 * been moved to a new directory. 615 */ 616 void 617 reinsert(dep) 618 struct denode *dep; 619 { 620 /* 621 * Fix up the denode cache. If the denode is for a directory, 622 * there is nothing to do since the hash is based on the starting 623 * cluster of the directory file and that hasn't changed. If for a 624 * file the hash is based on the location of the directory entry, 625 * so we must remove it from the cache and re-enter it with the 626 * hash based on the new location of the directory entry. 627 */ 628 if (dep->de_Attributes & ATTR_DIRECTORY) 629 return; 630 msdosfs_hashrem(dep); 631 msdosfs_hashins(dep); 632 } 633 634 int 635 msdosfs_reclaim(ap) 636 struct vop_reclaim_args /* { 637 struct vnode *a_vp; 638 } */ *ap; 639 { 640 struct vnode *vp = ap->a_vp; 641 struct denode *dep = VTODE(vp); 642 643 #ifdef MSDOSFS_DEBUG 644 printf("msdosfs_reclaim(): dep %p, file %s, refcnt %ld\n", 645 dep, dep->de_Name, dep->de_refcnt); 646 #endif 647 648 if (prtactive && vp->v_usecount != 0) 649 vprint("msdosfs_reclaim(): pushing active", vp); 650 /* 651 * Remove the denode from its hash chain. 652 */ 653 msdosfs_hashrem(dep); 654 /* 655 * Purge old data structures associated with the denode. 656 */ 657 cache_purge(vp); 658 if (dep->de_devvp) { 659 vrele(dep->de_devvp); 660 dep->de_devvp = 0; 661 } 662 #if 0 /* XXX */ 663 dep->de_flag = 0; 664 #endif 665 lockdestroy(&vp->v_lock); 666 FREE(dep, M_MSDOSFSNODE); 667 vp->v_data = NULL; 668 669 return (0); 670 } 671 672 int 673 msdosfs_inactive(ap) 674 struct vop_inactive_args /* { 675 struct vnode *a_vp; 676 struct proc *a_p; 677 } */ *ap; 678 { 679 struct vnode *vp = ap->a_vp; 680 struct denode *dep = VTODE(vp); 681 struct proc *p = ap->a_p; 682 int error = 0; 683 684 #ifdef MSDOSFS_DEBUG 685 printf("msdosfs_inactive(): dep %p, de_Name[0] %x\n", dep, dep->de_Name[0]); 686 #endif 687 688 if (prtactive && vp->v_usecount != 0) 689 vprint("msdosfs_inactive(): pushing active", vp); 690 691 /* 692 * Ignore denodes related to stale file handles. 693 */ 694 if (dep->de_Name[0] == SLOT_DELETED) 695 goto out; 696 697 /* 698 * If the file has been deleted and it is on a read/write 699 * filesystem, then truncate the file, and mark the directory slot 700 * as empty. (This may not be necessary for the dos filesystem.) 701 */ 702 #ifdef MSDOSFS_DEBUG 703 printf("msdosfs_inactive(): dep %p, refcnt %ld, mntflag %x, MNT_RDONLY %x\n", 704 dep, dep->de_refcnt, vp->v_mount->mnt_flag, MNT_RDONLY); 705 #endif 706 if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 707 error = detrunc(dep, (u_long) 0, 0, NOCRED, p); 708 dep->de_flag |= DE_UPDATE; 709 dep->de_Name[0] = SLOT_DELETED; 710 } 711 deupdat(dep, 0); 712 713 out: 714 VOP_UNLOCK(vp, 0, p); 715 /* 716 * If we are done with the denode, reclaim it 717 * so that it can be reused immediately. 718 */ 719 #ifdef MSDOSFS_DEBUG 720 printf("msdosfs_inactive(): v_usecount %d, de_Name[0] %x\n", vp->v_usecount, 721 dep->de_Name[0]); 722 #endif 723 if (dep->de_Name[0] == SLOT_DELETED) 724 vrecycle(vp, (struct simplelock *)0, p); 725 return (error); 726 } 727