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 1.10 2004/03/01 06:33:21 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_token_init(&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 lwkt_tokref ilock; 130 lwkt_tokref vlock; 131 struct vnode *vp; 132 133 lwkt_gettoken(&ilock, &dehash_token); 134 loop: 135 for (dep = DEHASH(dev, dirclust, diroff); dep; dep = dep->de_next) { 136 if (dirclust != dep->de_dirclust 137 || diroff != dep->de_diroffset 138 || dev != dep->de_dev 139 || dep->de_refcnt == 0) { 140 continue; 141 } 142 vp = DETOV(dep); 143 lwkt_gettoken(&vlock, vp->v_interlock); 144 /* 145 * We must check to see if the inode has been ripped 146 * out from under us after blocking. 147 */ 148 for (dep = DEHASH(dev, dirclust, diroff); dep; dep = dep->de_next) { 149 if (dirclust == dep->de_dirclust 150 && diroff == dep->de_diroffset 151 && dev == dep->de_dev 152 && dep->de_refcnt != 0) { 153 break; 154 } 155 } 156 if (dep == NULL || DETOV(dep) != vp) { 157 lwkt_reltoken(&vlock); 158 goto loop; 159 } 160 if (vget(vp, &vlock, LK_EXCLUSIVE | LK_INTERLOCK, td)) 161 goto loop; 162 lwkt_reltoken(&ilock); 163 return (dep); 164 } 165 lwkt_reltoken(&ilock); 166 return (NULL); 167 } 168 169 static void 170 msdosfs_hashins(dep) 171 struct denode *dep; 172 { 173 struct denode **depp, *deq; 174 lwkt_tokref ilock; 175 176 lwkt_gettoken(&ilock, &dehash_token); 177 depp = &DEHASH(dep->de_dev, dep->de_dirclust, dep->de_diroffset); 178 deq = *depp; 179 if (deq) 180 deq->de_prev = &dep->de_next; 181 dep->de_next = deq; 182 dep->de_prev = depp; 183 *depp = dep; 184 lwkt_reltoken(&ilock); 185 } 186 187 static void 188 msdosfs_hashrem(dep) 189 struct denode *dep; 190 { 191 struct denode *deq; 192 lwkt_tokref ilock; 193 194 lwkt_gettoken(&ilock, &dehash_token); 195 deq = dep->de_next; 196 if (deq) 197 deq->de_prev = dep->de_prev; 198 *dep->de_prev = deq; 199 #ifdef DIAGNOSTIC 200 dep->de_next = NULL; 201 dep->de_prev = NULL; 202 #endif 203 lwkt_reltoken(&ilock); 204 } 205 206 /* 207 * If deget() succeeds it returns with the gotten denode locked(). 208 * 209 * pmp - address of msdosfsmount structure of the filesystem containing 210 * the denode of interest. The pm_dev field and the address of 211 * the msdosfsmount structure are used. 212 * dirclust - which cluster bp contains, if dirclust is 0 (root directory) 213 * diroffset is relative to the beginning of the root directory, 214 * otherwise it is cluster relative. 215 * diroffset - offset past begin of cluster of denode we want 216 * depp - returns the address of the gotten denode. 217 */ 218 int 219 deget(pmp, dirclust, diroffset, depp) 220 struct msdosfsmount *pmp; /* so we know the maj/min number */ 221 u_long dirclust; /* cluster this dir entry came from */ 222 u_long diroffset; /* index of entry within the cluster */ 223 struct denode **depp; /* returns the addr of the gotten denode */ 224 { 225 struct thread *td = curthread; /* XXX */ 226 int error; 227 dev_t dev = pmp->pm_dev; 228 struct mount *mntp = pmp->pm_mountp; 229 struct direntry *direntptr; 230 struct denode *ldep; 231 struct vnode *nvp; 232 struct buf *bp; 233 struct timeval tv; 234 235 #ifdef MSDOSFS_DEBUG 236 printf("deget(pmp %p, dirclust %lu, diroffset %lx, depp %p)\n", 237 pmp, dirclust, diroffset, depp); 238 #endif 239 240 /* 241 * On FAT32 filesystems, root is a (more or less) normal 242 * directory 243 */ 244 if (FAT32(pmp) && dirclust == MSDOSFSROOT) 245 dirclust = pmp->pm_rootdirblk; 246 247 /* 248 * See if the denode is in the denode cache. Use the location of 249 * the directory entry to compute the hash value. For subdir use 250 * address of "." entry. For root dir (if not FAT32) use cluster 251 * MSDOSFSROOT, offset MSDOSFSROOT_OFS 252 * 253 * NOTE: The check for de_refcnt > 0 below insures the denode being 254 * examined does not represent an unlinked but still open file. 255 * These files are not to be accessible even when the directory 256 * entry that represented the file happens to be reused while the 257 * deleted file is still open. 258 */ 259 ldep = msdosfs_hashget(dev, dirclust, diroffset); 260 if (ldep) { 261 *depp = ldep; 262 return (0); 263 } 264 265 /* 266 * Do the MALLOC before the getnewvnode since doing so afterward 267 * might cause a bogus v_data pointer to get dereferenced 268 * elsewhere if MALLOC should block. 269 */ 270 MALLOC(ldep, struct denode *, sizeof(struct denode), M_MSDOSFSNODE, M_WAITOK); 271 272 /* 273 * Directory entry was not in cache, have to create a vnode and 274 * copy it from the passed disk buffer. 275 */ 276 /* getnewvnode() does a VREF() on the vnode */ 277 error = getnewvnode(VT_MSDOSFS, mntp, msdosfs_vnodeop_p, &nvp); 278 if (error) { 279 *depp = NULL; 280 FREE(ldep, M_MSDOSFSNODE); 281 return error; 282 } 283 bzero((caddr_t)ldep, sizeof *ldep); 284 lockinit(&ldep->de_lock, 0, "denode", VLKTIMEOUT, 0); 285 nvp->v_data = ldep; 286 ldep->de_vnode = nvp; 287 ldep->de_flag = 0; 288 ldep->de_devvp = 0; 289 ldep->de_dev = dev; 290 ldep->de_dirclust = dirclust; 291 ldep->de_diroffset = diroffset; 292 fc_purge(ldep, 0); /* init the fat cache for this denode */ 293 294 /* 295 * Lock the denode so that it can't be accessed until we've read 296 * it in and have done what we need to it. Do this here instead 297 * of at the start of msdosfs_hashins() so that reinsert() can 298 * call msdosfs_hashins() with a locked denode. 299 */ 300 if (lockmgr(&ldep->de_lock, LK_EXCLUSIVE, NULL, td)) 301 panic("deget: unexpected lock failure"); 302 303 /* 304 * Insert the denode into the hash queue. 305 */ 306 msdosfs_hashins(ldep); 307 308 ldep->de_pmp = pmp; 309 ldep->de_refcnt = 1; 310 /* 311 * Copy the directory entry into the denode area of the vnode. 312 */ 313 if ((dirclust == MSDOSFSROOT 314 || (FAT32(pmp) && dirclust == pmp->pm_rootdirblk)) 315 && diroffset == MSDOSFSROOT_OFS) { 316 /* 317 * Directory entry for the root directory. There isn't one, 318 * so we manufacture one. We should probably rummage 319 * through the root directory and find a label entry (if it 320 * exists), and then use the time and date from that entry 321 * as the time and date for the root denode. 322 */ 323 nvp->v_flag |= VROOT; /* should be further down XXX */ 324 325 ldep->de_Attributes = ATTR_DIRECTORY; 326 ldep->de_LowerCase = 0; 327 if (FAT32(pmp)) 328 ldep->de_StartCluster = pmp->pm_rootdirblk; 329 /* de_FileSize will be filled in further down */ 330 else { 331 ldep->de_StartCluster = MSDOSFSROOT; 332 ldep->de_FileSize = pmp->pm_rootdirsize * DEV_BSIZE; 333 } 334 /* 335 * fill in time and date so that dos2unixtime() doesn't 336 * spit up when called from msdosfs_getattr() with root 337 * denode 338 */ 339 ldep->de_CHun = 0; 340 ldep->de_CTime = 0x0000; /* 00:00:00 */ 341 ldep->de_CDate = (0 << DD_YEAR_SHIFT) | (1 << DD_MONTH_SHIFT) 342 | (1 << DD_DAY_SHIFT); 343 /* Jan 1, 1980 */ 344 ldep->de_ADate = ldep->de_CDate; 345 ldep->de_MTime = ldep->de_CTime; 346 ldep->de_MDate = ldep->de_CDate; 347 /* leave the other fields as garbage */ 348 } else { 349 error = readep(pmp, dirclust, diroffset, &bp, &direntptr); 350 if (error) { 351 /* 352 * The denode does not contain anything useful, so 353 * it would be wrong to leave it on its hash chain. 354 * Arrange for vput() to just forget about it. 355 */ 356 ldep->de_Name[0] = SLOT_DELETED; 357 358 vput(nvp); 359 *depp = NULL; 360 return (error); 361 } 362 DE_INTERNALIZE(ldep, direntptr); 363 brelse(bp); 364 } 365 366 /* 367 * Fill in a few fields of the vnode and finish filling in the 368 * denode. Then return the address of the found denode. 369 */ 370 if (ldep->de_Attributes & ATTR_DIRECTORY) { 371 /* 372 * Since DOS directory entries that describe directories 373 * have 0 in the filesize field, we take this opportunity 374 * to find out the length of the directory and plug it into 375 * the denode structure. 376 */ 377 u_long size; 378 379 /* 380 * XXX Sometimes, these arrives that . entry have cluster 381 * number 0, when it shouldn't. Use real cluster number 382 * instead of what is written in directory entry. 383 */ 384 if ((diroffset == 0) && (ldep->de_StartCluster != dirclust)) { 385 printf("deget(): . entry at clust %ld != %ld\n", 386 dirclust, ldep->de_StartCluster); 387 ldep->de_StartCluster = dirclust; 388 } 389 390 nvp->v_type = VDIR; 391 if (ldep->de_StartCluster != MSDOSFSROOT) { 392 error = pcbmap(ldep, 0xffff, 0, &size, 0); 393 if (error == E2BIG) { 394 ldep->de_FileSize = de_cn2off(pmp, size); 395 error = 0; 396 } else 397 printf("deget(): pcbmap returned %d\n", error); 398 } 399 } else 400 nvp->v_type = VREG; 401 getmicrouptime(&tv); 402 SETHIGH(ldep->de_modrev, tv.tv_sec); 403 SETLOW(ldep->de_modrev, tv.tv_usec * 4294); 404 ldep->de_devvp = pmp->pm_devvp; 405 VREF(ldep->de_devvp); 406 *depp = ldep; 407 return (0); 408 } 409 410 int 411 deupdat(dep, waitfor) 412 struct denode *dep; 413 int waitfor; 414 { 415 int error; 416 struct buf *bp; 417 struct direntry *dirp; 418 struct timespec ts; 419 420 if (DETOV(dep)->v_mount->mnt_flag & MNT_RDONLY) 421 return (0); 422 getnanotime(&ts); 423 DETIMES(dep, &ts, &ts, &ts); 424 if ((dep->de_flag & DE_MODIFIED) == 0) 425 return (0); 426 dep->de_flag &= ~DE_MODIFIED; 427 if (dep->de_Attributes & ATTR_DIRECTORY) 428 return (0); 429 if (dep->de_refcnt <= 0) 430 return (0); 431 error = readde(dep, &bp, &dirp); 432 if (error) 433 return (error); 434 DE_EXTERNALIZE(dirp, dep); 435 if (waitfor) 436 return (bwrite(bp)); 437 else { 438 bdwrite(bp); 439 return (0); 440 } 441 } 442 443 /* 444 * Truncate the file described by dep to the length specified by length. 445 */ 446 int 447 detrunc(dep, length, flags, td) 448 struct denode *dep; 449 u_long length; 450 int flags; 451 struct thread *td; 452 { 453 int error; 454 int allerror; 455 u_long eofentry; 456 u_long chaintofree; 457 daddr_t bn; 458 int boff; 459 int isadir = dep->de_Attributes & ATTR_DIRECTORY; 460 struct buf *bp; 461 struct msdosfsmount *pmp = dep->de_pmp; 462 463 #ifdef MSDOSFS_DEBUG 464 printf("detrunc(): file %s, length %lu, flags %x\n", dep->de_Name, length, flags); 465 #endif 466 467 /* 468 * Disallow attempts to truncate the root directory since it is of 469 * fixed size. That's just the way dos filesystems are. We use 470 * the VROOT bit in the vnode because checking for the directory 471 * bit and a startcluster of 0 in the denode is not adequate to 472 * recognize the root directory at this point in a file or 473 * directory's life. 474 */ 475 if ((DETOV(dep)->v_flag & VROOT) && !FAT32(pmp)) { 476 printf("detrunc(): can't truncate root directory, clust %ld, offset %ld\n", 477 dep->de_dirclust, dep->de_diroffset); 478 return (EINVAL); 479 } 480 481 482 if (dep->de_FileSize < length) { 483 vnode_pager_setsize(DETOV(dep), length); 484 return deextend(dep, length); 485 } 486 487 /* 488 * If the desired length is 0 then remember the starting cluster of 489 * the file and set the StartCluster field in the directory entry 490 * to 0. If the desired length is not zero, then get the number of 491 * the last cluster in the shortened file. Then get the number of 492 * the first cluster in the part of the file that is to be freed. 493 * Then set the next cluster pointer in the last cluster of the 494 * file to CLUST_EOFE. 495 */ 496 if (length == 0) { 497 chaintofree = dep->de_StartCluster; 498 dep->de_StartCluster = 0; 499 eofentry = ~0; 500 } else { 501 error = pcbmap(dep, de_clcount(pmp, length) - 1, 0, 502 &eofentry, 0); 503 if (error) { 504 #ifdef MSDOSFS_DEBUG 505 printf("detrunc(): pcbmap fails %d\n", error); 506 #endif 507 return (error); 508 } 509 } 510 511 fc_purge(dep, de_clcount(pmp, length)); 512 513 /* 514 * If the new length is not a multiple of the cluster size then we 515 * must zero the tail end of the new last cluster in case it 516 * becomes part of the file again because of a seek. 517 */ 518 if ((boff = length & pmp->pm_crbomask) != 0) { 519 if (isadir) { 520 bn = cntobn(pmp, eofentry); 521 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, &bp); 522 } else { 523 bn = de_blk(pmp, length); 524 error = bread(DETOV(dep), bn, pmp->pm_bpcluster, &bp); 525 } 526 if (error) { 527 brelse(bp); 528 #ifdef MSDOSFS_DEBUG 529 printf("detrunc(): bread fails %d\n", error); 530 #endif 531 return (error); 532 } 533 /* 534 * is this the right place for it? 535 */ 536 bzero(bp->b_data + boff, pmp->pm_bpcluster - boff); 537 if (flags & IO_SYNC) 538 bwrite(bp); 539 else 540 bdwrite(bp); 541 } 542 543 /* 544 * Write out the updated directory entry. Even if the update fails 545 * we free the trailing clusters. 546 */ 547 dep->de_FileSize = length; 548 if (!isadir) 549 dep->de_flag |= DE_UPDATE|DE_MODIFIED; 550 allerror = vtruncbuf(DETOV(dep), td, length, pmp->pm_bpcluster); 551 #ifdef MSDOSFS_DEBUG 552 if (allerror) 553 printf("detrunc(): vtruncbuf error %d\n", allerror); 554 #endif 555 error = deupdat(dep, 1); 556 if (error && (allerror == 0)) 557 allerror = error; 558 #ifdef MSDOSFS_DEBUG 559 printf("detrunc(): allerror %d, eofentry %lu\n", 560 allerror, eofentry); 561 #endif 562 563 /* 564 * If we need to break the cluster chain for the file then do it 565 * now. 566 */ 567 if (eofentry != ~0) { 568 error = fatentry(FAT_GET_AND_SET, pmp, eofentry, 569 &chaintofree, CLUST_EOFE); 570 if (error) { 571 #ifdef MSDOSFS_DEBUG 572 printf("detrunc(): fatentry errors %d\n", error); 573 #endif 574 return (error); 575 } 576 fc_setcache(dep, FC_LASTFC, de_cluster(pmp, length - 1), 577 eofentry); 578 } 579 580 /* 581 * Now free the clusters removed from the file because of the 582 * truncation. 583 */ 584 if (chaintofree != 0 && !MSDOSFSEOF(pmp, chaintofree)) 585 freeclusterchain(pmp, chaintofree); 586 587 return (allerror); 588 } 589 590 /* 591 * Extend the file described by dep to length specified by length. 592 */ 593 int 594 deextend(dep, length) 595 struct denode *dep; 596 u_long length; 597 { 598 struct msdosfsmount *pmp = dep->de_pmp; 599 u_long count; 600 int error; 601 602 /* 603 * The root of a DOS filesystem cannot be extended. 604 */ 605 if ((DETOV(dep)->v_flag & VROOT) && !FAT32(pmp)) 606 return (EINVAL); 607 608 /* 609 * Directories cannot be extended. 610 */ 611 if (dep->de_Attributes & ATTR_DIRECTORY) 612 return (EISDIR); 613 614 if (length <= dep->de_FileSize) 615 panic("deextend: file too large"); 616 617 /* 618 * Compute the number of clusters to allocate. 619 */ 620 count = de_clcount(pmp, length) - de_clcount(pmp, dep->de_FileSize); 621 if (count > 0) { 622 if (count > pmp->pm_freeclustercount) 623 return (ENOSPC); 624 error = extendfile(dep, count, NULL, NULL, DE_CLEAR); 625 if (error) { 626 /* truncate the added clusters away again */ 627 (void) detrunc(dep, dep->de_FileSize, 0, NULL); 628 return (error); 629 } 630 } 631 dep->de_FileSize = length; 632 dep->de_flag |= DE_UPDATE|DE_MODIFIED; 633 return (deupdat(dep, 1)); 634 } 635 636 /* 637 * Move a denode to its correct hash queue after the file it represents has 638 * been moved to a new directory. 639 */ 640 void 641 reinsert(dep) 642 struct denode *dep; 643 { 644 /* 645 * Fix up the denode cache. If the denode is for a directory, 646 * there is nothing to do since the hash is based on the starting 647 * cluster of the directory file and that hasn't changed. If for a 648 * file the hash is based on the location of the directory entry, 649 * so we must remove it from the cache and re-enter it with the 650 * hash based on the new location of the directory entry. 651 */ 652 if (dep->de_Attributes & ATTR_DIRECTORY) 653 return; 654 msdosfs_hashrem(dep); 655 msdosfs_hashins(dep); 656 } 657 658 int 659 msdosfs_reclaim(ap) 660 struct vop_reclaim_args /* { 661 struct vnode *a_vp; 662 } */ *ap; 663 { 664 struct vnode *vp = ap->a_vp; 665 struct denode *dep = VTODE(vp); 666 667 #ifdef MSDOSFS_DEBUG 668 printf("msdosfs_reclaim(): dep %p, file %s, refcnt %ld\n", 669 dep, dep->de_Name, dep->de_refcnt); 670 #endif 671 672 if (prtactive && vp->v_usecount != 0) 673 vprint("msdosfs_reclaim(): pushing active", vp); 674 /* 675 * Remove the denode from its hash chain. 676 */ 677 msdosfs_hashrem(dep); 678 /* 679 * Purge old data structures associated with the denode. 680 */ 681 cache_purge(vp); 682 if (dep->de_devvp) { 683 vrele(dep->de_devvp); 684 dep->de_devvp = 0; 685 } 686 #if 0 /* XXX */ 687 dep->de_flag = 0; 688 #endif 689 FREE(dep, M_MSDOSFSNODE); 690 vp->v_data = NULL; 691 692 return (0); 693 } 694 695 int 696 msdosfs_inactive(ap) 697 struct vop_inactive_args /* { 698 struct vnode *a_vp; 699 struct thread *a_td; 700 } */ *ap; 701 { 702 struct vnode *vp = ap->a_vp; 703 struct denode *dep = VTODE(vp); 704 int error = 0; 705 706 #ifdef MSDOSFS_DEBUG 707 printf("msdosfs_inactive(): dep %p, de_Name[0] %x\n", dep, dep->de_Name[0]); 708 #endif 709 710 if (prtactive && vp->v_usecount != 0) 711 vprint("msdosfs_inactive(): pushing active", vp); 712 713 /* 714 * Ignore denodes related to stale file handles. 715 */ 716 if (dep->de_Name[0] == SLOT_DELETED) 717 goto out; 718 719 /* 720 * If the file has been deleted and it is on a read/write 721 * filesystem, then truncate the file, and mark the directory slot 722 * as empty. (This may not be necessary for the dos filesystem.) 723 */ 724 #ifdef MSDOSFS_DEBUG 725 printf("msdosfs_inactive(): dep %p, refcnt %ld, mntflag %x, MNT_RDONLY %x\n", 726 dep, dep->de_refcnt, vp->v_mount->mnt_flag, MNT_RDONLY); 727 #endif 728 if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 729 error = detrunc(dep, (u_long) 0, 0, ap->a_td); 730 dep->de_flag |= DE_UPDATE; 731 dep->de_Name[0] = SLOT_DELETED; 732 } 733 deupdat(dep, 0); 734 735 out: 736 VOP_UNLOCK(vp, NULL, 0, ap->a_td); 737 /* 738 * If we are done with the denode, reclaim it 739 * so that it can be reused immediately. 740 */ 741 #ifdef MSDOSFS_DEBUG 742 printf("msdosfs_inactive(): v_usecount %d, de_Name[0] %x\n", vp->v_usecount, 743 dep->de_Name[0]); 744 #endif 745 if (dep->de_Name[0] == SLOT_DELETED) 746 vrecycle(vp, NULL, ap->a_td); 747 return (error); 748 } 749