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 1.23 2006/04/07 06:38:32 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 int msdosfs_hashins (struct denode *dep); 71 static void msdosfs_hashrem (struct denode *dep); 72 73 static MALLOC_DEFINE(M_MSDOSFSNODE, "MSDOSFS node", "MSDOSFS vnode private part"); 74 75 static struct denode **dehashtbl; 76 static u_long dehash; /* size of hash table - 1 */ 77 #define DEHASH(dev, dcl, doff) (dehashtbl[(minor(dev) + (dcl) + (doff) / \ 78 sizeof(struct direntry)) & dehash]) 79 static struct lwkt_token dehash_token; 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 (dev_t dev, u_long dirclust, u_long diroff); 100 101 /*ARGSUSED*/ 102 int 103 msdosfs_init(struct vfsconf *vfsp) 104 { 105 dehash = 16; 106 while (dehash < desiredvnodes) 107 dehash <<= 1; 108 dehashtbl = malloc(sizeof(void *) * dehash, M_MSDOSFSMNT, 109 M_WAITOK|M_ZERO); 110 --dehash; 111 lwkt_token_init(&dehash_token); 112 return (0); 113 } 114 115 int 116 msdosfs_uninit(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_t dev, u_long dirclust, u_long diroff) 126 { 127 struct thread *td = curthread; /* XXX */ 128 struct denode *dep; 129 lwkt_tokref ilock; 130 struct vnode *vp; 131 132 lwkt_gettoken(&ilock, &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 continue; 140 } 141 vp = DETOV(dep); 142 if (vget(vp, LK_EXCLUSIVE, td)) 143 goto loop; 144 145 /* 146 * We must check to see if the inode has been ripped 147 * out from under us after blocking. 148 */ 149 for (dep = DEHASH(dev, dirclust, diroff); dep; dep = dep->de_next) { 150 if (dirclust == dep->de_dirclust 151 && diroff == dep->de_diroffset 152 && dev == dep->de_dev 153 && dep->de_refcnt != 0) { 154 break; 155 } 156 } 157 if (dep == NULL || DETOV(dep) != vp) { 158 vput(vp); 159 goto loop; 160 } 161 lwkt_reltoken(&ilock); 162 return (dep); 163 } 164 lwkt_reltoken(&ilock); 165 return (NULL); 166 } 167 168 static 169 int 170 msdosfs_hashins(struct denode *dep) 171 { 172 struct denode **depp, *deq; 173 lwkt_tokref ilock; 174 175 lwkt_gettoken(&ilock, &dehash_token); 176 depp = &DEHASH(dep->de_dev, dep->de_dirclust, dep->de_diroffset); 177 while ((deq = *depp) != NULL) { 178 if (deq->de_dev == dep->de_dev && 179 deq->de_dirclust == dep->de_dirclust && 180 deq->de_diroffset == dep->de_diroffset) { 181 lwkt_reltoken(&ilock); 182 return(EBUSY); 183 } 184 depp = &deq->de_next; 185 } 186 dep->de_next = NULL; 187 *depp = dep; 188 lwkt_reltoken(&ilock); 189 return(0); 190 } 191 192 static 193 void 194 msdosfs_hashrem(struct denode *dep) 195 { 196 struct denode **depp, *deq; 197 lwkt_tokref ilock; 198 199 lwkt_gettoken(&ilock, &dehash_token); 200 depp = &DEHASH(dep->de_dev, dep->de_dirclust, dep->de_diroffset); 201 while ((deq = *depp) != NULL) { 202 if (dep == deq) 203 break; 204 depp = &deq->de_next; 205 } 206 KKASSERT(dep == deq); 207 *depp = dep->de_next; 208 dep->de_next = NULL; 209 lwkt_reltoken(&ilock); 210 } 211 212 void 213 msdosfs_reinsert(struct denode *ip, u_long new_dirclust, u_long new_diroffset) 214 { 215 lwkt_tokref ilock; 216 217 lwkt_gettoken(&ilock, &dehash_token); 218 msdosfs_hashrem(ip); 219 ip->de_dirclust = new_dirclust; 220 ip->de_diroffset = new_diroffset; 221 msdosfs_hashins(ip); 222 lwkt_reltoken(&ilock); 223 } 224 225 /* 226 * If deget() succeeds it returns with the gotten denode locked(). 227 * 228 * pmp - address of msdosfsmount structure of the filesystem containing 229 * the denode of interest. The pm_dev field and the address of 230 * the msdosfsmount structure are used. 231 * dirclust - which cluster bp contains, if dirclust is 0 (root directory) 232 * diroffset is relative to the beginning of the root directory, 233 * otherwise it is cluster relative. 234 * diroffset - offset past begin of cluster of denode we want 235 * depp - returns the address of the gotten denode. 236 */ 237 int 238 deget(struct msdosfsmount *pmp, /* so we know the maj/min number */ 239 u_long dirclust, /* cluster this dir entry came from */ 240 u_long diroffset, /* index of entry within the cluster */ 241 struct denode **depp) /* returns the addr of the gotten denode */ 242 { 243 int error; 244 dev_t dev = pmp->pm_dev; 245 struct mount *mntp = pmp->pm_mountp; 246 struct direntry *direntptr; 247 struct denode *ldep; 248 struct vnode *nvp; 249 struct buf *bp; 250 struct timeval tv; 251 252 #ifdef MSDOSFS_DEBUG 253 printf("deget(pmp %p, dirclust %lu, diroffset %lx, depp %p)\n", 254 pmp, dirclust, diroffset, depp); 255 #endif 256 257 /* 258 * On FAT32 filesystems, root is a (more or less) normal 259 * directory 260 */ 261 if (FAT32(pmp) && dirclust == MSDOSFSROOT) 262 dirclust = pmp->pm_rootdirblk; 263 264 again: 265 /* 266 * See if the denode is in the denode cache. Use the location of 267 * the directory entry to compute the hash value. For subdir use 268 * address of "." entry. For root dir (if not FAT32) use cluster 269 * MSDOSFSROOT, offset MSDOSFSROOT_OFS 270 * 271 * NOTE: The check for de_refcnt > 0 below insures the denode being 272 * examined does not represent an unlinked but still open file. 273 * These files are not to be accessible even when the directory 274 * entry that represented the file happens to be reused while the 275 * deleted file is still open. 276 */ 277 ldep = msdosfs_hashget(dev, dirclust, diroffset); 278 if (ldep) { 279 *depp = ldep; 280 return (0); 281 } 282 283 /* 284 * Do the MALLOC before the getnewvnode since doing so afterward 285 * might cause a bogus v_data pointer to get dereferenced 286 * elsewhere if MALLOC should block. 287 */ 288 MALLOC(ldep, struct denode *, sizeof(struct denode), M_MSDOSFSNODE, M_WAITOK); 289 290 /* 291 * Directory entry was not in cache, have to create a vnode and 292 * copy it from the passed disk buffer. 293 */ 294 295 /* getnewvnode() does a vref() on the vnode */ 296 error = getnewvnode(VT_MSDOSFS, mntp, &nvp, VLKTIMEOUT, 0); 297 if (error) { 298 *depp = NULL; 299 FREE(ldep, M_MSDOSFSNODE); 300 return error; 301 } 302 303 bzero((caddr_t)ldep, sizeof *ldep); 304 ldep->de_vnode = nvp; 305 ldep->de_flag = 0; 306 ldep->de_devvp = 0; 307 ldep->de_dev = dev; 308 ldep->de_dirclust = dirclust; 309 ldep->de_diroffset = diroffset; 310 fc_purge(ldep, 0); /* init the fat cache for this denode */ 311 312 /* 313 * Insert the denode into the hash queue. If a collision occurs 314 * throw away the vnode and try again. 315 */ 316 if (msdosfs_hashins(ldep) != 0) { 317 printf("debug: msdosfs: hashins collision, retrying\n"); 318 vx_put(nvp); 319 free(ldep, M_MSDOSFSNODE); 320 goto again; 321 } 322 nvp->v_data = ldep; 323 ldep->de_pmp = pmp; 324 ldep->de_refcnt = 1; 325 /* 326 * Copy the directory entry into the denode area of the vnode. 327 */ 328 if ((dirclust == MSDOSFSROOT 329 || (FAT32(pmp) && dirclust == pmp->pm_rootdirblk)) 330 && diroffset == MSDOSFSROOT_OFS) { 331 /* 332 * Directory entry for the root directory. There isn't one, 333 * so we manufacture one. We should probably rummage 334 * through the root directory and find a label entry (if it 335 * exists), and then use the time and date from that entry 336 * as the time and date for the root denode. 337 */ 338 nvp->v_flag |= VROOT; /* should be further down XXX */ 339 340 ldep->de_Attributes = ATTR_DIRECTORY; 341 ldep->de_LowerCase = 0; 342 if (FAT32(pmp)) 343 ldep->de_StartCluster = pmp->pm_rootdirblk; 344 /* de_FileSize will be filled in further down */ 345 else { 346 ldep->de_StartCluster = MSDOSFSROOT; 347 ldep->de_FileSize = pmp->pm_rootdirsize * DEV_BSIZE; 348 } 349 /* 350 * fill in time and date so that dos2unixtime() doesn't 351 * spit up when called from msdosfs_getattr() with root 352 * denode 353 */ 354 ldep->de_CHun = 0; 355 ldep->de_CTime = 0x0000; /* 00:00:00 */ 356 ldep->de_CDate = (0 << DD_YEAR_SHIFT) | (1 << DD_MONTH_SHIFT) 357 | (1 << DD_DAY_SHIFT); 358 /* Jan 1, 1980 */ 359 ldep->de_ADate = ldep->de_CDate; 360 ldep->de_MTime = ldep->de_CTime; 361 ldep->de_MDate = ldep->de_CDate; 362 /* leave the other fields as garbage */ 363 } else { 364 error = readep(pmp, dirclust, diroffset, &bp, &direntptr); 365 if (error) { 366 /* 367 * The denode does not contain anything useful, so 368 * it would be wrong to leave it on its hash chain. 369 * Arrange for vput() to just forget about it. 370 */ 371 ldep->de_Name[0] = SLOT_DELETED; 372 373 vx_put(nvp); 374 *depp = NULL; 375 return (error); 376 } 377 DE_INTERNALIZE(ldep, direntptr); 378 brelse(bp); 379 } 380 381 /* 382 * Fill in a few fields of the vnode and finish filling in the 383 * denode. Then return the address of the found denode. 384 */ 385 if (ldep->de_Attributes & ATTR_DIRECTORY) { 386 /* 387 * Since DOS directory entries that describe directories 388 * have 0 in the filesize field, we take this opportunity 389 * to find out the length of the directory and plug it into 390 * the denode structure. 391 */ 392 u_long size; 393 394 /* 395 * XXX Sometimes, these arrives that . entry have cluster 396 * number 0, when it shouldn't. Use real cluster number 397 * instead of what is written in directory entry. 398 */ 399 if ((diroffset == 0) && (ldep->de_StartCluster != dirclust)) { 400 printf("deget(): . entry at clust %ld != %ld\n", 401 dirclust, ldep->de_StartCluster); 402 ldep->de_StartCluster = dirclust; 403 } 404 405 nvp->v_type = VDIR; 406 if (ldep->de_StartCluster != MSDOSFSROOT) { 407 error = pcbmap(ldep, 0xffff, NULL, &size, NULL); 408 if (error == E2BIG) { 409 ldep->de_FileSize = de_cn2off(pmp, size); 410 error = 0; 411 } else 412 printf("deget(): pcbmap returned %d\n", error); 413 } 414 } else { 415 nvp->v_type = VREG; 416 } 417 getmicrouptime(&tv); 418 SETHIGH(ldep->de_modrev, tv.tv_sec); 419 SETLOW(ldep->de_modrev, tv.tv_usec * 4294); 420 ldep->de_devvp = pmp->pm_devvp; 421 vref(ldep->de_devvp); 422 vinitvmio(nvp, ldep->de_FileSize); 423 /* 424 * Leave nvp locked and refd so the returned inode is effectively 425 * locked and refd. 426 */ 427 *depp = ldep; 428 return (0); 429 } 430 431 int 432 deupdat(struct denode *dep, int waitfor) 433 { 434 int error; 435 struct buf *bp; 436 struct direntry *dirp; 437 struct timespec ts; 438 439 if (DETOV(dep)->v_mount->mnt_flag & MNT_RDONLY) 440 return (0); 441 getnanotime(&ts); 442 DETIMES(dep, &ts, &ts, &ts); 443 if ((dep->de_flag & DE_MODIFIED) == 0) 444 return (0); 445 dep->de_flag &= ~DE_MODIFIED; 446 if (dep->de_Attributes & ATTR_DIRECTORY) 447 return (0); 448 if (dep->de_refcnt <= 0) 449 return (0); 450 error = readde(dep, &bp, &dirp); 451 if (error) 452 return (error); 453 DE_EXTERNALIZE(dirp, dep); 454 if (waitfor) 455 return (bwrite(bp)); 456 else { 457 bdwrite(bp); 458 return (0); 459 } 460 } 461 462 /* 463 * Truncate the file described by dep to the length specified by length. 464 */ 465 int 466 detrunc(struct denode *dep, u_long length, int flags, struct thread *td) 467 { 468 int error; 469 int allerror; 470 u_long eofentry; 471 u_long chaintofree; 472 daddr_t bn, cn; 473 int boff; 474 int isadir = dep->de_Attributes & ATTR_DIRECTORY; 475 struct buf *bp; 476 struct msdosfsmount *pmp = dep->de_pmp; 477 478 #ifdef MSDOSFS_DEBUG 479 printf("detrunc(): file %s, length %lu, flags %x\n", dep->de_Name, length, flags); 480 #endif 481 482 /* 483 * Disallow attempts to truncate the root directory since it is of 484 * fixed size. That's just the way dos filesystems are. We use 485 * the VROOT bit in the vnode because checking for the directory 486 * bit and a startcluster of 0 in the denode is not adequate to 487 * recognize the root directory at this point in a file or 488 * directory's life. 489 */ 490 if ((DETOV(dep)->v_flag & VROOT) && !FAT32(pmp)) { 491 printf("detrunc(): can't truncate root directory, clust %ld, offset %ld\n", 492 dep->de_dirclust, dep->de_diroffset); 493 return (EINVAL); 494 } 495 496 497 if (dep->de_FileSize < length) { 498 vnode_pager_setsize(DETOV(dep), length); 499 return deextend(dep, length); 500 } 501 502 /* 503 * If the desired length is 0 then remember the starting cluster of 504 * the file and set the StartCluster field in the directory entry 505 * to 0. If the desired length is not zero, then get the number of 506 * the last cluster in the shortened file. Then get the number of 507 * the first cluster in the part of the file that is to be freed. 508 * Then set the next cluster pointer in the last cluster of the 509 * file to CLUST_EOFE. 510 */ 511 if (length == 0) { 512 chaintofree = dep->de_StartCluster; 513 dep->de_StartCluster = 0; 514 eofentry = ~0; 515 } else { 516 error = pcbmap(dep, de_clcount(pmp, length) - 1, 517 NULL, &eofentry, NULL); 518 if (error) { 519 #ifdef MSDOSFS_DEBUG 520 printf("detrunc(): pcbmap fails %d\n", error); 521 #endif 522 return (error); 523 } 524 } 525 526 fc_purge(dep, de_clcount(pmp, length)); 527 528 /* 529 * If the new length is not a multiple of the cluster size then we 530 * must zero the tail end of the new last cluster in case it 531 * becomes part of the file again because of a seek. 532 */ 533 if ((boff = length & pmp->pm_crbomask) != 0) { 534 if (isadir) { 535 bn = xcntobn(pmp, eofentry); 536 error = bread(pmp->pm_devvp, de_bntodoff(pmp, bn), pmp->pm_bpcluster, &bp); 537 } else { 538 cn = de_cluster(pmp, length); 539 error = bread(DETOV(dep), de_cn2doff(pmp, cn), pmp->pm_bpcluster, &bp); 540 } 541 if (error) { 542 brelse(bp); 543 #ifdef MSDOSFS_DEBUG 544 printf("detrunc(): bread fails %d\n", error); 545 #endif 546 return (error); 547 } 548 /* 549 * is this the right place for it? 550 */ 551 bzero(bp->b_data + boff, pmp->pm_bpcluster - boff); 552 if (flags & IO_SYNC) 553 bwrite(bp); 554 else 555 bdwrite(bp); 556 } 557 558 /* 559 * Write out the updated directory entry. Even if the update fails 560 * we free the trailing clusters. 561 */ 562 dep->de_FileSize = length; 563 if (!isadir) 564 dep->de_flag |= DE_UPDATE|DE_MODIFIED; 565 allerror = vtruncbuf(DETOV(dep), td, length, pmp->pm_bpcluster); 566 #ifdef MSDOSFS_DEBUG 567 if (allerror) 568 printf("detrunc(): vtruncbuf error %d\n", allerror); 569 #endif 570 error = deupdat(dep, 1); 571 if (error && (allerror == 0)) 572 allerror = error; 573 #ifdef MSDOSFS_DEBUG 574 printf("detrunc(): allerror %d, eofentry %lu\n", 575 allerror, eofentry); 576 #endif 577 578 /* 579 * If we need to break the cluster chain for the file then do it 580 * now. 581 */ 582 if (eofentry != ~0) { 583 error = fatentry(FAT_GET_AND_SET, pmp, eofentry, 584 &chaintofree, CLUST_EOFE); 585 if (error) { 586 #ifdef MSDOSFS_DEBUG 587 printf("detrunc(): fatentry errors %d\n", error); 588 #endif 589 return (error); 590 } 591 fc_setcache(dep, FC_LASTFC, de_cluster(pmp, length - 1), 592 eofentry); 593 } 594 595 /* 596 * Now free the clusters removed from the file because of the 597 * truncation. 598 */ 599 if (chaintofree != 0 && !MSDOSFSEOF(pmp, chaintofree)) 600 freeclusterchain(pmp, chaintofree); 601 602 return (allerror); 603 } 604 605 /* 606 * Extend the file described by dep to length specified by length. 607 */ 608 int 609 deextend(struct denode *dep, u_long length) 610 { 611 struct msdosfsmount *pmp = dep->de_pmp; 612 u_long count; 613 int error; 614 615 /* 616 * The root of a DOS filesystem cannot be extended. 617 */ 618 if ((DETOV(dep)->v_flag & VROOT) && !FAT32(pmp)) 619 return (EINVAL); 620 621 /* 622 * Directories cannot be extended. 623 */ 624 if (dep->de_Attributes & ATTR_DIRECTORY) 625 return (EISDIR); 626 627 if (length <= dep->de_FileSize) 628 panic("deextend: file too large"); 629 630 /* 631 * Compute the number of clusters to allocate. 632 */ 633 count = de_clcount(pmp, length) - de_clcount(pmp, dep->de_FileSize); 634 if (count > 0) { 635 if (count > pmp->pm_freeclustercount) 636 return (ENOSPC); 637 error = extendfile(dep, count, NULL, NULL, DE_CLEAR); 638 if (error) { 639 /* truncate the added clusters away again */ 640 detrunc(dep, dep->de_FileSize, 0, NULL); 641 return (error); 642 } 643 } 644 dep->de_FileSize = length; 645 dep->de_flag |= DE_UPDATE|DE_MODIFIED; 646 return (deupdat(dep, 1)); 647 } 648 649 /* 650 * msdosfs_reclaim(struct vnode *a_vp) 651 */ 652 int 653 msdosfs_reclaim(struct vop_reclaim_args *ap) 654 { 655 struct vnode *vp = ap->a_vp; 656 struct denode *dep = VTODE(vp); 657 658 #ifdef MSDOSFS_DEBUG 659 printf("msdosfs_reclaim(): dep %p, file %s, refcnt %ld\n", 660 dep, dep ? dep->de_Name : "?", dep ? dep->de_refcnt : -1); 661 #endif 662 663 if (prtactive && vp->v_usecount != 0) 664 vprint("msdosfs_reclaim(): pushing active", vp); 665 /* 666 * Remove the denode from its hash chain. 667 */ 668 vp->v_data = NULL; 669 if (dep) { 670 msdosfs_hashrem(dep); 671 if (dep->de_devvp) { 672 vrele(dep->de_devvp); 673 dep->de_devvp = 0; 674 } 675 free(dep, M_MSDOSFSNODE); 676 } 677 return (0); 678 } 679 680 /* 681 * msdosfs_inactive(struct vnode *a_vp, struct thread *a_td) 682 */ 683 int 684 msdosfs_inactive(struct vop_inactive_args *ap) 685 { 686 struct vnode *vp = ap->a_vp; 687 struct denode *dep = VTODE(vp); 688 int error = 0; 689 690 #ifdef MSDOSFS_DEBUG 691 printf("msdosfs_inactive(): dep %p, de_Name[0] %x\n", dep, dep->de_Name[0]); 692 #endif 693 694 if (prtactive && vp->v_usecount != 0) 695 vprint("msdosfs_inactive(): pushing active", vp); 696 697 /* 698 * Ignore denodes related to stale file handles. 699 */ 700 if (dep->de_Name[0] == SLOT_DELETED) 701 goto out; 702 703 /* 704 * If the file has been deleted and it is on a read/write 705 * filesystem, then truncate the file, and mark the directory slot 706 * as empty. (This may not be necessary for the dos filesystem.) 707 */ 708 #ifdef MSDOSFS_DEBUG 709 printf("msdosfs_inactive(): dep %p, refcnt %ld, mntflag %x, MNT_RDONLY %x\n", 710 dep, dep->de_refcnt, vp->v_mount->mnt_flag, MNT_RDONLY); 711 #endif 712 if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 713 error = detrunc(dep, (u_long) 0, 0, ap->a_td); 714 dep->de_flag |= DE_UPDATE; 715 dep->de_Name[0] = SLOT_DELETED; 716 } 717 deupdat(dep, 0); 718 719 out: 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", vp->v_usecount, 726 dep->de_Name[0]); 727 #endif 728 if (dep->de_Name[0] == SLOT_DELETED) 729 vrecycle(vp, ap->a_td); 730 return (error); 731 } 732