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sys/fs/msdosfs/msdosfs_denode.c
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1 /* $FreeBSD: releng/5.0/sys/fs/msdosfs/msdosfs_denode.c 105077 2002-10-14 03:20:36Z mckusick $ */ 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 #include <sys/mutex.h> 60 61 #include <vm/vm.h> 62 #include <vm/vm_extern.h> 63 64 #include <fs/msdosfs/bpb.h> 65 #include <fs/msdosfs/msdosfsmount.h> 66 #include <fs/msdosfs/direntry.h> 67 #include <fs/msdosfs/denode.h> 68 #include <fs/msdosfs/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 mtx dehash_mtx; 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, u_long diroff); 97 static void msdosfs_hashins(struct denode *dep); 98 static void msdosfs_hashrem(struct denode *dep); 99 100 /*ARGSUSED*/ 101 int 102 msdosfs_init(vfsp) 103 struct vfsconf *vfsp; 104 { 105 dehashtbl = hashinit(desiredvnodes/2, M_MSDOSFSMNT, &dehash); 106 mtx_init(&dehash_mtx, "msdosfs dehash", NULL, MTX_DEF); 107 return (0); 108 } 109 110 int 111 msdosfs_uninit(vfsp) 112 struct vfsconf *vfsp; 113 { 114 115 if (dehashtbl) 116 free(dehashtbl, M_MSDOSFSMNT); 117 mtx_destroy(&dehash_mtx); 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; 130 131 loop: 132 mtx_lock(&dehash_mtx); 133 for (dep = DEHASH(dev, dirclust, diroff); dep; dep = dep->de_next) { 134 if (dirclust == dep->de_dirclust 135 && diroff == dep->de_diroffset 136 && dev == dep->de_dev 137 && dep->de_refcnt != 0) { 138 vp = DETOV(dep); 139 mtx_lock(&vp->v_interlock); 140 mtx_unlock(&dehash_mtx); 141 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) 142 goto loop; 143 return (dep); 144 } 145 } 146 mtx_unlock(&dehash_mtx); 147 return (NULL); 148 } 149 150 static void 151 msdosfs_hashins(dep) 152 struct denode *dep; 153 { 154 struct denode **depp, *deq; 155 156 mtx_lock(&dehash_mtx); 157 depp = &DEHASH(dep->de_dev, dep->de_dirclust, dep->de_diroffset); 158 deq = *depp; 159 if (deq) 160 deq->de_prev = &dep->de_next; 161 dep->de_next = deq; 162 dep->de_prev = depp; 163 *depp = dep; 164 mtx_unlock(&dehash_mtx); 165 } 166 167 static void 168 msdosfs_hashrem(dep) 169 struct denode *dep; 170 { 171 struct denode *deq; 172 173 mtx_lock(&dehash_mtx); 174 deq = dep->de_next; 175 if (deq) 176 deq->de_prev = dep->de_prev; 177 *dep->de_prev = deq; 178 #ifdef DIAGNOSTIC 179 dep->de_next = NULL; 180 dep->de_prev = NULL; 181 #endif 182 mtx_unlock(&dehash_mtx); 183 } 184 185 /* 186 * If deget() succeeds it returns with the gotten denode locked(). 187 * 188 * pmp - address of msdosfsmount structure of the filesystem containing 189 * the denode of interest. The pm_dev field and the address of 190 * the msdosfsmount structure are used. 191 * dirclust - which cluster bp contains, if dirclust is 0 (root directory) 192 * diroffset is relative to the beginning of the root directory, 193 * otherwise it is cluster relative. 194 * diroffset - offset past begin of cluster of denode we want 195 * depp - returns the address of the gotten denode. 196 */ 197 int 198 deget(pmp, dirclust, diroffset, depp) 199 struct msdosfsmount *pmp; /* so we know the maj/min number */ 200 u_long dirclust; /* cluster this dir entry came from */ 201 u_long diroffset; /* index of entry within the cluster */ 202 struct denode **depp; /* returns the addr of the gotten denode */ 203 { 204 int error; 205 dev_t dev = pmp->pm_dev; 206 struct mount *mntp = pmp->pm_mountp; 207 struct direntry *direntptr; 208 struct denode *ldep; 209 struct vnode *nvp; 210 struct buf *bp; 211 struct thread *td = curthread; /* XXX */ 212 struct timeval tv; 213 214 #ifdef MSDOSFS_DEBUG 215 printf("deget(pmp %p, dirclust %lu, diroffset %lx, depp %p)\n", 216 pmp, dirclust, diroffset, depp); 217 #endif 218 219 /* 220 * On FAT32 filesystems, root is a (more or less) normal 221 * directory 222 */ 223 if (FAT32(pmp) && dirclust == MSDOSFSROOT) 224 dirclust = pmp->pm_rootdirblk; 225 226 /* 227 * See if the denode is in the denode cache. Use the location of 228 * the directory entry to compute the hash value. For subdir use 229 * address of "." entry. For root dir (if not FAT32) use cluster 230 * MSDOSFSROOT, offset MSDOSFSROOT_OFS 231 * 232 * NOTE: The check for de_refcnt > 0 below insures the denode being 233 * examined does not represent an unlinked but still open file. 234 * These files are not to be accessible even when the directory 235 * entry that represented the file happens to be reused while the 236 * deleted file is still open. 237 */ 238 ldep = msdosfs_hashget(dev, dirclust, diroffset); 239 if (ldep) { 240 *depp = ldep; 241 return (0); 242 } 243 244 /* 245 * Do the MALLOC before the getnewvnode since doing so afterward 246 * might cause a bogus v_data pointer to get dereferenced 247 * elsewhere if MALLOC should block. 248 */ 249 MALLOC(ldep, struct denode *, sizeof(struct denode), M_MSDOSFSNODE, M_WAITOK); 250 251 /* 252 * Directory entry was not in cache, have to create a vnode and 253 * copy it from the passed disk buffer. 254 */ 255 /* getnewvnode() does a VREF() on the vnode */ 256 error = getnewvnode("msdosfs", mntp, msdosfs_vnodeop_p, &nvp); 257 if (error) { 258 *depp = NULL; 259 FREE(ldep, M_MSDOSFSNODE); 260 return error; 261 } 262 bzero((caddr_t)ldep, sizeof *ldep); 263 nvp->v_data = ldep; 264 ldep->de_vnode = nvp; 265 ldep->de_flag = 0; 266 ldep->de_devvp = 0; 267 ldep->de_dev = dev; 268 ldep->de_dirclust = dirclust; 269 ldep->de_diroffset = diroffset; 270 fc_purge(ldep, 0); /* init the fat cache for this denode */ 271 272 /* 273 * Lock the denode so that it can't be accessed until we've read 274 * it in and have done what we need to it. Do this here instead 275 * of at the start of msdosfs_hashins() so that reinsert() can 276 * call msdosfs_hashins() with a locked denode. 277 */ 278 if (VOP_LOCK(nvp, LK_EXCLUSIVE, td) != 0) 279 panic("deget: unexpected lock failure"); 280 281 /* 282 * Insert the denode into the hash queue. 283 */ 284 msdosfs_hashins(ldep); 285 286 ldep->de_pmp = pmp; 287 ldep->de_refcnt = 1; 288 /* 289 * Copy the directory entry into the denode area of the vnode. 290 */ 291 if ((dirclust == MSDOSFSROOT 292 || (FAT32(pmp) && dirclust == pmp->pm_rootdirblk)) 293 && diroffset == MSDOSFSROOT_OFS) { 294 /* 295 * Directory entry for the root directory. There isn't one, 296 * so we manufacture one. We should probably rummage 297 * through the root directory and find a label entry (if it 298 * exists), and then use the time and date from that entry 299 * as the time and date for the root denode. 300 */ 301 nvp->v_vflag |= VV_ROOT; /* should be further down XXX */ 302 303 ldep->de_Attributes = ATTR_DIRECTORY; 304 ldep->de_LowerCase = 0; 305 if (FAT32(pmp)) 306 ldep->de_StartCluster = pmp->pm_rootdirblk; 307 /* de_FileSize will be filled in further down */ 308 else { 309 ldep->de_StartCluster = MSDOSFSROOT; 310 ldep->de_FileSize = pmp->pm_rootdirsize * DEV_BSIZE; 311 } 312 /* 313 * fill in time and date so that dos2unixtime() doesn't 314 * spit up when called from msdosfs_getattr() with root 315 * denode 316 */ 317 ldep->de_CHun = 0; 318 ldep->de_CTime = 0x0000; /* 00:00:00 */ 319 ldep->de_CDate = (0 << DD_YEAR_SHIFT) | (1 << DD_MONTH_SHIFT) 320 | (1 << DD_DAY_SHIFT); 321 /* Jan 1, 1980 */ 322 ldep->de_ADate = ldep->de_CDate; 323 ldep->de_MTime = ldep->de_CTime; 324 ldep->de_MDate = ldep->de_CDate; 325 /* leave the other fields as garbage */ 326 } else { 327 error = readep(pmp, dirclust, diroffset, &bp, &direntptr); 328 if (error) { 329 /* 330 * The denode does not contain anything useful, so 331 * it would be wrong to leave it on its hash chain. 332 * Arrange for vput() to just forget about it. 333 */ 334 ldep->de_Name[0] = SLOT_DELETED; 335 336 vput(nvp); 337 *depp = NULL; 338 return (error); 339 } 340 DE_INTERNALIZE(ldep, direntptr); 341 brelse(bp); 342 } 343 344 /* 345 * Fill in a few fields of the vnode and finish filling in the 346 * denode. Then return the address of the found denode. 347 */ 348 if (ldep->de_Attributes & ATTR_DIRECTORY) { 349 /* 350 * Since DOS directory entries that describe directories 351 * have 0 in the filesize field, we take this opportunity 352 * to find out the length of the directory and plug it into 353 * the denode structure. 354 */ 355 u_long size; 356 357 /* 358 * XXX Sometimes, these arrives that . entry have cluster 359 * number 0, when it shouldn't. Use real cluster number 360 * instead of what is written in directory entry. 361 */ 362 if ((diroffset == 0) && (ldep->de_StartCluster != dirclust)) { 363 printf("deget(): . entry at clust %ld != %ld\n", 364 dirclust, ldep->de_StartCluster); 365 ldep->de_StartCluster = dirclust; 366 } 367 368 nvp->v_type = VDIR; 369 if (ldep->de_StartCluster != MSDOSFSROOT) { 370 error = pcbmap(ldep, 0xffff, 0, &size, 0); 371 if (error == E2BIG) { 372 ldep->de_FileSize = de_cn2off(pmp, size); 373 error = 0; 374 } else 375 printf("deget(): pcbmap returned %d\n", error); 376 } 377 } else 378 nvp->v_type = VREG; 379 getmicrouptime(&tv); 380 SETHIGH(ldep->de_modrev, tv.tv_sec); 381 SETLOW(ldep->de_modrev, tv.tv_usec * 4294); 382 ldep->de_devvp = pmp->pm_devvp; 383 VREF(ldep->de_devvp); 384 *depp = ldep; 385 return (0); 386 } 387 388 int 389 deupdat(dep, waitfor) 390 struct denode *dep; 391 int waitfor; 392 { 393 int error; 394 struct buf *bp; 395 struct direntry *dirp; 396 struct timespec ts; 397 398 if (DETOV(dep)->v_mount->mnt_flag & MNT_RDONLY) 399 return (0); 400 getnanotime(&ts); 401 DETIMES(dep, &ts, &ts, &ts); 402 if ((dep->de_flag & DE_MODIFIED) == 0) 403 return (0); 404 dep->de_flag &= ~DE_MODIFIED; 405 if (dep->de_Attributes & ATTR_DIRECTORY) 406 return (0); 407 if (dep->de_refcnt <= 0) 408 return (0); 409 error = readde(dep, &bp, &dirp); 410 if (error) 411 return (error); 412 DE_EXTERNALIZE(dirp, dep); 413 if (waitfor) 414 return (bwrite(bp)); 415 else { 416 bdwrite(bp); 417 return (0); 418 } 419 } 420 421 /* 422 * Truncate the file described by dep to the length specified by length. 423 */ 424 int 425 detrunc(dep, length, flags, cred, td) 426 struct denode *dep; 427 u_long length; 428 int flags; 429 struct ucred *cred; 430 struct thread *td; 431 { 432 int error; 433 int allerror; 434 u_long eofentry; 435 u_long chaintofree; 436 daddr_t bn; 437 int boff; 438 int isadir = dep->de_Attributes & ATTR_DIRECTORY; 439 struct buf *bp; 440 struct msdosfsmount *pmp = dep->de_pmp; 441 442 #ifdef MSDOSFS_DEBUG 443 printf("detrunc(): file %s, length %lu, flags %x\n", dep->de_Name, length, flags); 444 #endif 445 446 /* 447 * Disallow attempts to truncate the root directory since it is of 448 * fixed size. That's just the way dos filesystems are. We use 449 * the VROOT bit in the vnode because checking for the directory 450 * bit and a startcluster of 0 in the denode is not adequate to 451 * recognize the root directory at this point in a file or 452 * directory's life. 453 */ 454 if ((DETOV(dep)->v_vflag & VV_ROOT) && !FAT32(pmp)) { 455 printf("detrunc(): can't truncate root directory, clust %ld, offset %ld\n", 456 dep->de_dirclust, dep->de_diroffset); 457 return (EINVAL); 458 } 459 460 461 if (dep->de_FileSize < length) { 462 vnode_pager_setsize(DETOV(dep), length); 463 return deextend(dep, length, cred); 464 } 465 466 /* 467 * If the desired length is 0 then remember the starting cluster of 468 * the file and set the StartCluster field in the directory entry 469 * to 0. If the desired length is not zero, then get the number of 470 * the last cluster in the shortened file. Then get the number of 471 * the first cluster in the part of the file that is to be freed. 472 * Then set the next cluster pointer in the last cluster of the 473 * file to CLUST_EOFE. 474 */ 475 if (length == 0) { 476 chaintofree = dep->de_StartCluster; 477 dep->de_StartCluster = 0; 478 eofentry = ~0; 479 } else { 480 error = pcbmap(dep, de_clcount(pmp, length) - 1, 0, 481 &eofentry, 0); 482 if (error) { 483 #ifdef MSDOSFS_DEBUG 484 printf("detrunc(): pcbmap fails %d\n", error); 485 #endif 486 return (error); 487 } 488 } 489 490 fc_purge(dep, de_clcount(pmp, length)); 491 492 /* 493 * If the new length is not a multiple of the cluster size then we 494 * must zero the tail end of the new last cluster in case it 495 * becomes part of the file again because of a seek. 496 */ 497 if ((boff = length & pmp->pm_crbomask) != 0) { 498 if (isadir) { 499 bn = cntobn(pmp, eofentry); 500 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, 501 NOCRED, &bp); 502 } else { 503 bn = de_blk(pmp, length); 504 error = bread(DETOV(dep), bn, pmp->pm_bpcluster, 505 NOCRED, &bp); 506 } 507 if (error) { 508 brelse(bp); 509 #ifdef MSDOSFS_DEBUG 510 printf("detrunc(): bread fails %d\n", error); 511 #endif 512 return (error); 513 } 514 /* 515 * is this the right place for it? 516 */ 517 bzero(bp->b_data + boff, pmp->pm_bpcluster - boff); 518 if (flags & IO_SYNC) 519 bwrite(bp); 520 else 521 bdwrite(bp); 522 } 523 524 /* 525 * Write out the updated directory entry. Even if the update fails 526 * we free the trailing clusters. 527 */ 528 dep->de_FileSize = length; 529 if (!isadir) 530 dep->de_flag |= DE_UPDATE|DE_MODIFIED; 531 allerror = vtruncbuf(DETOV(dep), cred, td, length, pmp->pm_bpcluster); 532 #ifdef MSDOSFS_DEBUG 533 if (allerror) 534 printf("detrunc(): vtruncbuf error %d\n", allerror); 535 #endif 536 error = deupdat(dep, 1); 537 if (error && (allerror == 0)) 538 allerror = error; 539 #ifdef MSDOSFS_DEBUG 540 printf("detrunc(): allerror %d, eofentry %lu\n", 541 allerror, eofentry); 542 #endif 543 544 /* 545 * If we need to break the cluster chain for the file then do it 546 * now. 547 */ 548 if (eofentry != ~0) { 549 error = fatentry(FAT_GET_AND_SET, pmp, eofentry, 550 &chaintofree, CLUST_EOFE); 551 if (error) { 552 #ifdef MSDOSFS_DEBUG 553 printf("detrunc(): fatentry errors %d\n", error); 554 #endif 555 return (error); 556 } 557 fc_setcache(dep, FC_LASTFC, de_cluster(pmp, length - 1), 558 eofentry); 559 } 560 561 /* 562 * Now free the clusters removed from the file because of the 563 * truncation. 564 */ 565 if (chaintofree != 0 && !MSDOSFSEOF(pmp, chaintofree)) 566 freeclusterchain(pmp, chaintofree); 567 568 return (allerror); 569 } 570 571 /* 572 * Extend the file described by dep to length specified by length. 573 */ 574 int 575 deextend(dep, length, cred) 576 struct denode *dep; 577 u_long length; 578 struct ucred *cred; 579 { 580 struct msdosfsmount *pmp = dep->de_pmp; 581 u_long count; 582 int error; 583 584 /* 585 * The root of a DOS filesystem cannot be extended. 586 */ 587 if ((DETOV(dep)->v_vflag & VV_ROOT) && !FAT32(pmp)) 588 return (EINVAL); 589 590 /* 591 * Directories cannot be extended. 592 */ 593 if (dep->de_Attributes & ATTR_DIRECTORY) 594 return (EISDIR); 595 596 if (length <= dep->de_FileSize) 597 panic("deextend: file too large"); 598 599 /* 600 * Compute the number of clusters to allocate. 601 */ 602 count = de_clcount(pmp, length) - de_clcount(pmp, dep->de_FileSize); 603 if (count > 0) { 604 if (count > pmp->pm_freeclustercount) 605 return (ENOSPC); 606 error = extendfile(dep, count, NULL, NULL, DE_CLEAR); 607 if (error) { 608 /* truncate the added clusters away again */ 609 (void) detrunc(dep, dep->de_FileSize, 0, cred, NULL); 610 return (error); 611 } 612 } 613 dep->de_FileSize = length; 614 dep->de_flag |= DE_UPDATE|DE_MODIFIED; 615 return (deupdat(dep, 1)); 616 } 617 618 /* 619 * Move a denode to its correct hash queue after the file it represents has 620 * been moved to a new directory. 621 */ 622 void 623 reinsert(dep) 624 struct denode *dep; 625 { 626 /* 627 * Fix up the denode cache. If the denode is for a directory, 628 * there is nothing to do since the hash is based on the starting 629 * cluster of the directory file and that hasn't changed. If for a 630 * file the hash is based on the location of the directory entry, 631 * so we must remove it from the cache and re-enter it with the 632 * hash based on the new location of the directory entry. 633 */ 634 if (dep->de_Attributes & ATTR_DIRECTORY) 635 return; 636 msdosfs_hashrem(dep); 637 msdosfs_hashins(dep); 638 } 639 640 int 641 msdosfs_reclaim(ap) 642 struct vop_reclaim_args /* { 643 struct vnode *a_vp; 644 } */ *ap; 645 { 646 struct vnode *vp = ap->a_vp; 647 struct denode *dep = VTODE(vp); 648 649 #ifdef MSDOSFS_DEBUG 650 printf("msdosfs_reclaim(): dep %p, file %s, refcnt %ld\n", 651 dep, dep->de_Name, dep->de_refcnt); 652 #endif 653 654 if (prtactive && vrefcnt(vp) != 0) 655 vprint("msdosfs_reclaim(): pushing active", vp); 656 /* 657 * Remove the denode from its hash chain. 658 */ 659 msdosfs_hashrem(dep); 660 /* 661 * Purge old data structures associated with the denode. 662 */ 663 cache_purge(vp); 664 if (dep->de_devvp) { 665 vrele(dep->de_devvp); 666 dep->de_devvp = 0; 667 } 668 #if 0 /* XXX */ 669 dep->de_flag = 0; 670 #endif 671 FREE(dep, M_MSDOSFSNODE); 672 vp->v_data = NULL; 673 674 return (0); 675 } 676 677 int 678 msdosfs_inactive(ap) 679 struct vop_inactive_args /* { 680 struct vnode *a_vp; 681 struct thread *a_td; 682 } */ *ap; 683 { 684 struct vnode *vp = ap->a_vp; 685 struct denode *dep = VTODE(vp); 686 struct thread *td = ap->a_td; 687 int error = 0; 688 689 #ifdef MSDOSFS_DEBUG 690 printf("msdosfs_inactive(): dep %p, de_Name[0] %x\n", dep, dep->de_Name[0]); 691 #endif 692 693 if (prtactive && vrefcnt(vp) != 0) 694 vprint("msdosfs_inactive(): pushing active", vp); 695 696 /* 697 * Ignore denodes related to stale file handles. 698 */ 699 if (dep->de_Name[0] == SLOT_DELETED) 700 goto out; 701 702 /* 703 * If the file has been deleted and it is on a read/write 704 * filesystem, then truncate the file, and mark the directory slot 705 * as empty. (This may not be necessary for the dos filesystem.) 706 */ 707 #ifdef MSDOSFS_DEBUG 708 printf("msdosfs_inactive(): dep %p, refcnt %ld, mntflag %x, MNT_RDONLY %x\n", 709 dep, dep->de_refcnt, vp->v_mount->mnt_flag, MNT_RDONLY); 710 #endif 711 if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 712 error = detrunc(dep, (u_long) 0, 0, NOCRED, td); 713 dep->de_flag |= DE_UPDATE; 714 dep->de_Name[0] = SLOT_DELETED; 715 } 716 deupdat(dep, 0); 717 718 out: 719 VOP_UNLOCK(vp, 0, td); 720 /* 721 * If we are done with the denode, reclaim it 722 * so that it can be reused immediately. 723 */ 724 #ifdef MSDOSFS_DEBUG 725 printf("msdosfs_inactive(): v_usecount %d, de_Name[0] %x\n", 726 vrefcnt(vp), dep->de_Name[0]); 727 #endif 728 if (dep->de_Name[0] == SLOT_DELETED) 729 vrecycle(vp, NULL, td); 730 return (error); 731 }
Cache object: 76abc056d95771268c5e26840cd78bda
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