1 /* $Id: msdosfs_denode.c,v 1.22 1997/02/22 09:40:46 peter Exp $ */ 2 /* $NetBSD: msdosfs_denode.c,v 1.9 1994/08/21 18:44:00 ws Exp $ */ 3 4 /*- 5 * Copyright (C) 1994 Wolfgang Solfrank. 6 * Copyright (C) 1994 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/mount.h> 54 #include <sys/malloc.h> 55 #include <sys/proc.h> 56 #include <sys/buf.h> 57 #include <sys/vnode.h> 58 #include <sys/types.h> 59 #include <sys/kernel.h> /* defines "time" */ 60 61 #include <vm/vm.h> 62 #include <vm/vm_param.h> 63 #include <vm/vm_extern.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 struct denode **dehashtbl; 72 u_long dehash; /* size of hash table - 1 */ 73 #define DEHASH(dev, deno) (dehashtbl[((dev) + (deno)) & dehash]) 74 static struct simplelock dehash_slock; 75 76 union _qcvt { 77 quad_t qcvt; 78 long val[2]; 79 }; 80 #define SETHIGH(q, h) { \ 81 union _qcvt tmp; \ 82 tmp.qcvt = (q); \ 83 tmp.val[_QUAD_HIGHWORD] = (h); \ 84 (q) = tmp.qcvt; \ 85 } 86 #define SETLOW(q, l) { \ 87 union _qcvt tmp; \ 88 tmp.qcvt = (q); \ 89 tmp.val[_QUAD_LOWWORD] = (l); \ 90 (q) = tmp.qcvt; \ 91 } 92 93 static struct denode * 94 msdosfs_hashget __P((dev_t dev, u_long dirclust, 95 u_long diroff)); 96 static void msdosfs_hashins __P((struct denode *dep)); 97 static void msdosfs_hashrem __P((struct denode *dep)); 98 99 int msdosfs_init(vfsp) 100 struct vfsconf *vfsp; 101 { 102 dehashtbl = hashinit(desiredvnodes/2, M_MSDOSFSMNT, &dehash); 103 simple_lock_init(&dehash_slock); 104 return 0; 105 } 106 107 static struct denode * 108 msdosfs_hashget(dev, dirclust, diroff) 109 dev_t dev; 110 u_long dirclust; 111 u_long diroff; 112 { 113 struct proc *p = curproc; /* XXX */ 114 struct denode *dep; 115 struct vnode *vp; 116 117 loop: 118 simple_lock(&dehash_slock); 119 for (dep = DEHASH(dev, dirclust + diroff); dep; dep = dep->de_next) { 120 if (dirclust == dep->de_dirclust 121 && diroff == dep->de_diroffset 122 && dev == dep->de_dev 123 && dep->de_refcnt != 0) { 124 vp = DETOV(dep); 125 simple_lock(&vp->v_interlock); 126 simple_unlock(&dehash_slock); 127 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, p)) 128 goto loop; 129 return (dep); 130 } 131 } 132 simple_unlock(&dehash_slock); 133 return (NULL); 134 } 135 136 static void 137 msdosfs_hashins(dep) 138 struct denode *dep; 139 { 140 struct denode **depp, *deq; 141 142 simple_lock(&dehash_slock); 143 depp = &DEHASH(dep->de_dev, dep->de_dirclust + dep->de_diroffset); 144 deq = *depp; 145 if (deq) 146 deq->de_prev = &dep->de_next; 147 dep->de_next = deq; 148 dep->de_prev = depp; 149 *depp = dep; 150 simple_unlock(&dehash_slock); 151 } 152 153 static void 154 msdosfs_hashrem(dep) 155 struct denode *dep; 156 { 157 struct denode *deq; 158 159 simple_lock(&dehash_slock); 160 deq = dep->de_next; 161 if (deq) 162 deq->de_prev = dep->de_prev; 163 *dep->de_prev = deq; 164 #ifdef DIAGNOSTIC 165 dep->de_next = NULL; 166 dep->de_prev = NULL; 167 #endif 168 simple_unlock(&dehash_slock); 169 } 170 171 /* 172 * If deget() succeeds it returns with the gotten denode locked(). 173 * 174 * pmp - address of msdosfsmount structure of the filesystem containing 175 * the denode of interest. The pm_dev field and the address of 176 * the msdosfsmount structure are used. 177 * dirclust - which cluster bp contains, if dirclust is 0 (root directory) 178 * diroffset is relative to the beginning of the root directory, 179 * otherwise it is cluster relative. 180 * diroffset - offset past begin of cluster of denode we want 181 * direntptr - address of the direntry structure of interest. If direntptr is 182 * NULL, the block is read if necessary. 183 * depp - returns the address of the gotten denode. 184 */ 185 int 186 deget(pmp, dirclust, diroffset, direntptr, depp) 187 struct msdosfsmount *pmp; /* so we know the maj/min number */ 188 u_long dirclust; /* cluster this dir entry came from */ 189 u_long diroffset; /* index of entry within the cluster */ 190 struct direntry *direntptr; 191 struct denode **depp; /* returns the addr of the gotten denode */ 192 { 193 int error; 194 dev_t dev = pmp->pm_dev; 195 struct mount *mntp = pmp->pm_mountp; 196 struct denode *ldep; 197 struct vnode *nvp; 198 struct buf *bp; 199 struct proc *p = curproc; /* XXX */ 200 201 #ifdef MSDOSFS_DEBUG 202 printf("deget(pmp %p, dirclust %ld, diroffset %x, direntptr %p, depp %p)\n", 203 pmp, dirclust, diroffset, direntptr, depp); 204 #endif 205 206 /* 207 * If dir entry is given and refers to a directory, convert to 208 * canonical form 209 */ 210 if (direntptr && (direntptr->deAttributes & ATTR_DIRECTORY)) { 211 dirclust = getushort(direntptr->deStartCluster); 212 if (dirclust == MSDOSFSROOT) 213 diroffset = MSDOSFSROOT_OFS; 214 else 215 diroffset = 0; 216 } 217 218 /* 219 * See if the denode is in the denode cache. Use the location of 220 * the directory entry to compute the hash value. For subdir use 221 * address of "." entry. for root dir use cluster MSDOSFSROOT, 222 * offset MSDOSFSROOT_OFS 223 * 224 * NOTE: The check for de_refcnt > 0 below insures the denode being 225 * examined does not represent an unlinked but still open file. 226 * These files are not to be accessible even when the directory 227 * entry that represented the file happens to be reused while the 228 * deleted file is still open. 229 */ 230 ldep = msdosfs_hashget(dev, dirclust, diroffset); 231 if (ldep) { 232 *depp = ldep; 233 return 0; 234 } 235 236 /* 237 * Do the MALLOC before the getnewvnode since doing so afterward 238 * might cause a bogus v_data pointer to get dereferenced 239 * elsewhere if MALLOC should block. 240 */ 241 MALLOC(ldep, struct denode *, sizeof(struct denode), M_MSDOSFSNODE, M_WAITOK); 242 243 /* 244 * Directory entry was not in cache, have to create a vnode and 245 * copy it from the passed disk buffer. 246 */ 247 /* getnewvnode() does a VREF() on the vnode */ 248 error = getnewvnode(VT_MSDOSFS, mntp, msdosfs_vnodeop_p, &nvp); 249 if (error) { 250 *depp = NULL; 251 FREE(ldep, M_MSDOSFSNODE); 252 return error; 253 } 254 bzero((caddr_t)ldep, sizeof *ldep); 255 lockinit(&ldep->de_lock, PINOD, "denode", 0, 0); 256 nvp->v_data = ldep; 257 ldep->de_vnode = nvp; 258 ldep->de_flag = 0; 259 ldep->de_devvp = 0; 260 ldep->de_lockf = 0; 261 ldep->de_dev = dev; 262 ldep->de_dirclust = dirclust; 263 ldep->de_diroffset = diroffset; 264 fc_purge(ldep, 0); /* init the fat cache for this denode */ 265 266 /* 267 * Lock the denode so that it can't be accessed until we've read 268 * it in and have done what we need to it. Do this here instead 269 * of at the start of msdosfs_hashins() so that reinsert() can 270 * call msdosfs_hashins() with a locked denode. 271 */ 272 if (lockmgr(&ldep->de_lock, LK_EXCLUSIVE, (struct simplelock *)0, p)) 273 panic("deget: unexpected lock failure"); 274 275 /* 276 * Insert the denode into the hash queue. 277 */ 278 msdosfs_hashins(ldep); 279 280 /* 281 * Copy the directory entry into the denode area of the vnode. 282 */ 283 if (dirclust == MSDOSFSROOT && diroffset == MSDOSFSROOT_OFS) { 284 /* 285 * Directory entry for the root directory. There isn't one, 286 * so we manufacture one. We should probably rummage 287 * through the root directory and find a label entry (if it 288 * exists), and then use the time and date from that entry 289 * as the time and date for the root denode. 290 */ 291 ldep->de_Attributes = ATTR_DIRECTORY; 292 ldep->de_StartCluster = MSDOSFSROOT; 293 ldep->de_FileSize = pmp->pm_rootdirsize * pmp->pm_BytesPerSec; 294 /* 295 * fill in time and date so that dos2unixtime() doesn't 296 * spit up when called from msdosfs_getattr() with root 297 * denode 298 */ 299 ldep->de_Time = 0x0000; /* 00:00:00 */ 300 ldep->de_Date = (0 << DD_YEAR_SHIFT) | (1 << DD_MONTH_SHIFT) 301 | (1 << DD_DAY_SHIFT); 302 /* Jan 1, 1980 */ 303 /* leave the other fields as garbage */ 304 } else { 305 bp = NULL; 306 if (!direntptr) { 307 error = readep(pmp, dirclust, diroffset, &bp, 308 &direntptr); 309 if (error) 310 return error; 311 } 312 DE_INTERNALIZE(ldep, direntptr); 313 if (bp) 314 brelse(bp); 315 } 316 317 /* 318 * Fill in a few fields of the vnode and finish filling in the 319 * denode. Then return the address of the found denode. 320 */ 321 ldep->de_pmp = pmp; 322 ldep->de_devvp = pmp->pm_devvp; 323 ldep->de_refcnt = 1; 324 if (ldep->de_Attributes & ATTR_DIRECTORY) { 325 /* 326 * Since DOS directory entries that describe directories 327 * have 0 in the filesize field, we take this opportunity 328 * to find out the length of the directory and plug it into 329 * the denode structure. 330 */ 331 u_long size; 332 333 nvp->v_type = VDIR; 334 if (ldep->de_StartCluster == MSDOSFSROOT) 335 nvp->v_flag |= VROOT; 336 else { 337 error = pcbmap(ldep, 0xffff, 0, &size); 338 if (error == E2BIG) { 339 ldep->de_FileSize = size << pmp->pm_cnshift; 340 error = 0; 341 } else 342 printf("deget(): pcbmap returned %d\n", error); 343 } 344 } else 345 nvp->v_type = VREG; 346 SETHIGH(ldep->de_modrev, mono_time.tv_sec); 347 SETLOW(ldep->de_modrev, mono_time.tv_usec * 4294); 348 VREF(ldep->de_devvp); 349 *depp = ldep; 350 return 0; 351 } 352 353 int 354 deupdat(dep, tp, waitfor) 355 struct denode *dep; 356 struct timespec *tp; 357 int waitfor; 358 { 359 int error; 360 struct buf *bp; 361 struct direntry *dirp; 362 struct vnode *vp = DETOV(dep); 363 364 #ifdef MSDOSFS_DEBUG 365 printf("deupdat(): dep %p\n", dep); 366 #endif 367 368 /* 369 * If the denode-modified and update-mtime bits are off, 370 * or this denode is from a readonly filesystem, 371 * or this denode is for a directory, 372 * or the denode represents an open but unlinked file, 373 * then don't do anything. DOS directory 374 * entries that describe a directory do not ever get 375 * updated. This is the way DOS treats them. 376 */ 377 if ((dep->de_flag & (DE_MODIFIED | DE_UPDATE)) == 0 || 378 vp->v_mount->mnt_flag & MNT_RDONLY || 379 dep->de_Attributes & ATTR_DIRECTORY || 380 dep->de_refcnt <= 0) 381 return 0; 382 383 /* 384 * Read in the cluster containing the directory entry we want to 385 * update. 386 */ 387 error = readde(dep, &bp, &dirp); 388 if (error) 389 return error; 390 391 /* 392 * If the mtime is to be updated, put the passed in time into the 393 * directory entry. 394 */ 395 if (dep->de_flag & DE_UPDATE) { 396 dep->de_Attributes |= ATTR_ARCHIVE; 397 unix2dostime(tp, &dep->de_Date, &dep->de_Time); 398 } 399 400 /* 401 * The mtime is now up to date. The denode will be unmodifed soon. 402 */ 403 dep->de_flag &= ~(DE_MODIFIED | DE_UPDATE); 404 405 /* 406 * Copy the directory entry out of the denode into the cluster it 407 * came from. 408 */ 409 DE_EXTERNALIZE(dirp, dep); 410 411 /* 412 * Write the cluster back to disk. If they asked for us to wait 413 * for the write to complete, then use bwrite() otherwise use 414 * bdwrite(). 415 */ 416 error = 0; /* note that error is 0 from above, but ... */ 417 if (waitfor) 418 error = bwrite(bp); 419 else 420 bdwrite(bp); 421 return error; 422 } 423 424 /* 425 * Truncate the file described by dep to the length specified by length. 426 */ 427 int 428 detrunc(dep, length, flags, cred, p) 429 struct denode *dep; 430 u_long length; 431 int flags; 432 struct ucred *cred; 433 struct proc *p; 434 { 435 int error; 436 int allerror; 437 int vflags; 438 u_long eofentry; 439 u_long chaintofree; 440 daddr_t bn; 441 int boff; 442 int isadir = dep->de_Attributes & ATTR_DIRECTORY; 443 struct buf *bp; 444 struct msdosfsmount *pmp = dep->de_pmp; 445 struct timespec ts; 446 447 #ifdef MSDOSFS_DEBUG 448 printf("detrunc(): file %s, length %d, flags %d\n", dep->de_Name, length, flags); 449 #endif 450 451 /* 452 * Disallow attempts to truncate the root directory since it is of 453 * fixed size. That's just the way dos filesystems are. We use 454 * the VROOT bit in the vnode because checking for the directory 455 * bit and a startcluster of 0 in the denode is not adequate to 456 * recognize the root directory at this point in a file or 457 * directory's life. 458 */ 459 if (DETOV(dep)->v_flag & VROOT) { 460 printf( 461 "detrunc(): can't truncate root directory, clust %ld, offset %ld\n", 462 dep->de_dirclust, dep->de_diroffset); 463 return EINVAL; 464 } 465 466 467 if (dep->de_FileSize < length) { 468 vnode_pager_setsize(DETOV(dep), length); 469 return deextend(dep, length, cred); 470 } 471 472 /* 473 * If the desired length is 0 then remember the starting cluster of 474 * the file and set the StartCluster field in the directory entry 475 * to 0. If the desired length is not zero, then get the number of 476 * the last cluster in the shortened file. Then get the number of 477 * the first cluster in the part of the file that is to be freed. 478 * Then set the next cluster pointer in the last cluster of the 479 * file to CLUST_EOFE. 480 */ 481 if (length == 0) { 482 chaintofree = dep->de_StartCluster; 483 dep->de_StartCluster = 0; 484 eofentry = ~0; 485 } else { 486 error = pcbmap(dep, de_clcount(pmp, length) - 1, 0, &eofentry); 487 if (error) { 488 #ifdef MSDOSFS_DEBUG 489 printf("detrunc(): pcbmap fails %d\n", error); 490 #endif 491 return error; 492 } 493 } 494 495 fc_purge(dep, (length + pmp->pm_crbomask) >> pmp->pm_cnshift); 496 497 /* 498 * If the new length is not a multiple of the cluster size then we 499 * must zero the tail end of the new last cluster in case it 500 * becomes part of the file again because of a seek. 501 */ 502 if ((boff = length & pmp->pm_crbomask) != 0) { 503 /* 504 * should read from file vnode or filesystem vnode 505 * depending on if file or dir 506 */ 507 if (isadir) { 508 bn = cntobn(pmp, eofentry); 509 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, 510 NOCRED, &bp); 511 } else { 512 bn = de_blk(pmp, length); 513 #ifdef PC98 514 /* 515 * 1024 byte/sector support 516 */ 517 if (pmp->pm_BytesPerSec == 1024) 518 DETOV(dep)->v_flag |= 0x10000; 519 #endif 520 error = bread(DETOV(dep), bn, pmp->pm_bpcluster, 521 NOCRED, &bp); 522 } 523 if (error) { 524 #ifdef MSDOSFS_DEBUG 525 printf("detrunc(): bread fails %d\n", error); 526 #endif 527 return error; 528 } 529 /* 530 * is this the right place for it? 531 */ 532 bzero(bp->b_data + boff, pmp->pm_bpcluster - boff); 533 if (flags & IO_SYNC) 534 bwrite(bp); 535 else 536 bdwrite(bp); 537 } 538 539 /* 540 * Write out the updated directory entry. Even if the update fails 541 * we free the trailing clusters. 542 */ 543 dep->de_FileSize = length; 544 dep->de_flag |= DE_UPDATE; 545 vflags = (length > 0 ? V_SAVE : 0) | V_SAVEMETA; 546 vinvalbuf(DETOV(dep), vflags, cred, p, 0, 0); 547 vnode_pager_setsize(DETOV(dep), length); 548 TIMEVAL_TO_TIMESPEC(&time, &ts); 549 allerror = deupdat(dep, &ts, 1); 550 #ifdef MSDOSFS_DEBUG 551 printf("detrunc(): allerror %d, eofentry %d\n", 552 allerror, eofentry); 553 #endif 554 555 /* 556 * If we need to break the cluster chain for the file then do it 557 * now. 558 */ 559 if (eofentry != ~0) { 560 error = fatentry(FAT_GET_AND_SET, pmp, eofentry, 561 &chaintofree, CLUST_EOFE); 562 if (error) { 563 #ifdef MSDOSFS_DEBUG 564 printf("detrunc(): fatentry errors %d\n", error); 565 #endif 566 return error; 567 } 568 fc_setcache(dep, FC_LASTFC, (length - 1) >> pmp->pm_cnshift, 569 eofentry); 570 } 571 572 /* 573 * Now free the clusters removed from the file because of the 574 * truncation. 575 */ 576 if (chaintofree != 0 && !MSDOSFSEOF(chaintofree)) 577 freeclusterchain(pmp, chaintofree); 578 579 return allerror; 580 } 581 582 /* 583 * Extend the file described by dep to length specified by length. 584 */ 585 int 586 deextend(dep, length, cred) 587 struct denode *dep; 588 off_t length; 589 struct ucred *cred; 590 { 591 struct msdosfsmount *pmp = dep->de_pmp; 592 u_long count; 593 int error; 594 struct timespec ts; 595 596 /* 597 * The root of a DOS filesystem cannot be extended. 598 */ 599 if (DETOV(dep)->v_flag & VROOT) 600 return EINVAL; 601 602 /* 603 * Directories can only be extended by the superuser. 604 * Is this really important? 605 */ 606 if (dep->de_Attributes & ATTR_DIRECTORY) { 607 error = suser(cred, NULL); 608 if (error) 609 return error; 610 } 611 612 if (length <= dep->de_FileSize) 613 panic("deextend: file too large"); 614 615 /* 616 * Compute the number of clusters to allocate. 617 */ 618 count = de_clcount(pmp, length) - de_clcount(pmp, dep->de_FileSize); 619 if (count > 0) { 620 if (count > pmp->pm_freeclustercount) 621 return ENOSPC; 622 error = extendfile(dep, count, NULL, NULL, DE_CLEAR); 623 if (error) { 624 /* truncate the added clusters away again */ 625 (void) detrunc(dep, dep->de_FileSize, 0, cred, NULL); 626 return error; 627 } 628 } 629 630 dep->de_flag |= DE_UPDATE; 631 dep->de_FileSize = length; 632 TIMEVAL_TO_TIMESPEC(&time, &ts); 633 return deupdat(dep, &ts, 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 int reinsert(dep) 641 struct denode *dep; 642 { 643 /* 644 * Fix up the denode cache. If the denode is for a directory, 645 * there is nothing to do since the hash is based on the starting 646 * cluster of the directory file and that hasn't changed. If for a 647 * file the hash is based on the location of the directory entry, 648 * so we must remove it from the cache and re-enter it with the 649 * hash based on the new location of the directory entry. 650 */ 651 if ((dep->de_Attributes & ATTR_DIRECTORY) == 0) { 652 msdosfs_hashrem(dep); 653 msdosfs_hashins(dep); 654 } 655 return 0; 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 /* 676 * Remove the denode from the denode hash chain we are in. 677 */ 678 msdosfs_hashrem(dep); 679 680 cache_purge(vp); 681 /* 682 * Indicate that one less file on the filesystem is open. 683 */ 684 if (dep->de_devvp) { 685 vrele(dep->de_devvp); 686 dep->de_devvp = 0; 687 } 688 689 dep->de_flag = 0; 690 691 FREE(dep, M_MSDOSFSNODE); 692 vp->v_data = NULL; 693 694 return 0; 695 } 696 697 int 698 msdosfs_inactive(ap) 699 struct vop_inactive_args /* { 700 struct vnode *a_vp; 701 struct proc *a_p; 702 } */ *ap; 703 { 704 struct vnode *vp = ap->a_vp; 705 struct denode *dep = VTODE(vp); 706 struct proc *p = ap->a_p; 707 int error = 0; 708 struct timespec ts; 709 710 #ifdef MSDOSFS_DEBUG 711 printf("msdosfs_inactive(): dep %p, de_Name[0] %x\n", dep, dep->de_Name[0]); 712 #endif 713 714 if (prtactive && vp->v_usecount != 0) 715 vprint("msdosfs_inactive(): pushing active", vp); 716 717 /* 718 * Ignore inodes related to stale file handles. 719 */ 720 if (dep->de_Name[0] == SLOT_DELETED) 721 goto out; 722 723 /* 724 * If the file has been deleted and it is on a read/write 725 * filesystem, then truncate the file, and mark the directory slot 726 * as empty. (This may not be necessary for the dos filesystem.) 727 */ 728 #ifdef MSDOSFS_DEBUG 729 printf("msdosfs_inactive(): dep %p, refcnt %ld, mntflag %x, MNT_RDONLY %x\n", 730 dep, dep->de_refcnt, vp->v_mount->mnt_flag, MNT_RDONLY); 731 #endif 732 if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 733 error = detrunc(dep, (u_long) 0, 0, NOCRED, p); 734 dep->de_flag |= DE_UPDATE; 735 dep->de_Name[0] = SLOT_DELETED; 736 } 737 if (dep->de_flag & (DE_MODIFIED | DE_UPDATE)) { 738 TIMEVAL_TO_TIMESPEC(&time, &ts); 739 deupdat(dep, &ts, 0); 740 } 741 out: 742 VOP_UNLOCK(vp, 0, p); 743 dep->de_flag = 0; 744 745 /* 746 * If we are done with the denode, then reclaim it so that it can 747 * be reused now. 748 */ 749 #ifdef MSDOSFS_DEBUG 750 printf("msdosfs_inactive(): v_usecount %d, de_Name[0] %x\n", vp->v_usecount, 751 dep->de_Name[0]); 752 #endif 753 if (dep->de_Name[0] == SLOT_DELETED) 754 vrecycle(vp, (struct simplelock *)0, p); 755 return error; 756 } 757