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 1.15 2004/08/28 19:02:18 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 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 /* 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 lwkt_reltoken(&vlock); 159 goto loop; 160 } 161 if (vget(vp, &vlock, LK_EXCLUSIVE | LK_INTERLOCK, td)) 162 goto loop; 163 lwkt_reltoken(&ilock); 164 return (dep); 165 } 166 lwkt_reltoken(&ilock); 167 return (NULL); 168 } 169 170 static 171 int 172 msdosfs_hashins(struct denode *dep) 173 { 174 struct denode **depp, *deq; 175 lwkt_tokref ilock; 176 177 lwkt_gettoken(&ilock, &dehash_token); 178 depp = &DEHASH(dep->de_dev, dep->de_dirclust, dep->de_diroffset); 179 while ((deq = *depp) != NULL) { 180 if (deq->de_dev == dep->de_dev && 181 deq->de_dirclust == dep->de_dirclust && 182 deq->de_diroffset == dep->de_diroffset) { 183 lwkt_reltoken(&ilock); 184 return(EBUSY); 185 } 186 depp = &deq->de_next; 187 } 188 dep->de_next = NULL; 189 *depp = dep; 190 lwkt_reltoken(&ilock); 191 return(0); 192 } 193 194 static 195 void 196 msdosfs_hashrem(struct denode *dep) 197 { 198 struct denode **depp, *deq; 199 lwkt_tokref ilock; 200 201 lwkt_gettoken(&ilock, &dehash_token); 202 depp = &DEHASH(dep->de_dev, dep->de_dirclust, dep->de_diroffset); 203 while ((deq = *depp) != NULL) { 204 if (dep == deq) 205 break; 206 depp = &deq->de_next; 207 } 208 KKASSERT(dep == deq); 209 *depp = dep->de_next; 210 dep->de_next = NULL; 211 lwkt_reltoken(&ilock); 212 } 213 214 void 215 msdosfs_reinsert(struct denode *ip, u_long new_dirclust, u_long new_diroffset) 216 { 217 lwkt_tokref ilock; 218 219 lwkt_gettoken(&ilock, &dehash_token); 220 msdosfs_hashrem(ip); 221 ip->de_dirclust = new_dirclust; 222 ip->de_diroffset = new_diroffset; 223 msdosfs_hashins(ip); 224 lwkt_reltoken(&ilock); 225 } 226 227 /* 228 * If deget() succeeds it returns with the gotten denode locked(). 229 * 230 * pmp - address of msdosfsmount structure of the filesystem containing 231 * the denode of interest. The pm_dev field and the address of 232 * the msdosfsmount structure are used. 233 * dirclust - which cluster bp contains, if dirclust is 0 (root directory) 234 * diroffset is relative to the beginning of the root directory, 235 * otherwise it is cluster relative. 236 * diroffset - offset past begin of cluster of denode we want 237 * depp - returns the address of the gotten denode. 238 */ 239 int 240 deget(struct msdosfsmount *pmp, /* so we know the maj/min number */ 241 u_long dirclust, /* cluster this dir entry came from */ 242 u_long diroffset, /* index of entry within the cluster */ 243 struct denode **depp) /* returns the addr of the gotten denode */ 244 { 245 struct thread *td = curthread; /* XXX */ 246 int error; 247 dev_t dev = pmp->pm_dev; 248 struct mount *mntp = pmp->pm_mountp; 249 struct direntry *direntptr; 250 struct denode *ldep; 251 struct vnode *nvp; 252 struct buf *bp; 253 struct timeval tv; 254 255 #ifdef MSDOSFS_DEBUG 256 printf("deget(pmp %p, dirclust %lu, diroffset %lx, depp %p)\n", 257 pmp, dirclust, diroffset, depp); 258 #endif 259 260 /* 261 * On FAT32 filesystems, root is a (more or less) normal 262 * directory 263 */ 264 if (FAT32(pmp) && dirclust == MSDOSFSROOT) 265 dirclust = pmp->pm_rootdirblk; 266 267 again: 268 /* 269 * See if the denode is in the denode cache. Use the location of 270 * the directory entry to compute the hash value. For subdir use 271 * address of "." entry. For root dir (if not FAT32) use cluster 272 * MSDOSFSROOT, offset MSDOSFSROOT_OFS 273 * 274 * NOTE: The check for de_refcnt > 0 below insures the denode being 275 * examined does not represent an unlinked but still open file. 276 * These files are not to be accessible even when the directory 277 * entry that represented the file happens to be reused while the 278 * deleted file is still open. 279 */ 280 ldep = msdosfs_hashget(dev, dirclust, diroffset); 281 if (ldep) { 282 *depp = ldep; 283 return (0); 284 } 285 286 /* 287 * Do the MALLOC before the getnewvnode since doing so afterward 288 * might cause a bogus v_data pointer to get dereferenced 289 * elsewhere if MALLOC should block. 290 */ 291 MALLOC(ldep, struct denode *, sizeof(struct denode), M_MSDOSFSNODE, M_WAITOK); 292 293 /* 294 * Directory entry was not in cache, have to create a vnode and 295 * copy it from the passed disk buffer. 296 */ 297 298 /* getnewvnode() does a vref() on the vnode */ 299 error = getnewvnode(VT_MSDOSFS, mntp, mntp->mnt_vn_ops, &nvp, 300 VLKTIMEOUT, 0); 301 if (error) { 302 *depp = NULL; 303 FREE(ldep, M_MSDOSFSNODE); 304 return error; 305 } 306 307 /* 308 * Lock the denode so that it can't be accessed until we've read 309 * it in and have done what we need to it. 310 */ 311 if (lockmgr(&nvp->v_lock, LK_EXCLUSIVE, NULL, td)) 312 panic("deget: unexpected lock failure"); 313 314 bzero((caddr_t)ldep, sizeof *ldep); 315 ldep->de_vnode = nvp; 316 ldep->de_flag = 0; 317 ldep->de_devvp = 0; 318 ldep->de_dev = dev; 319 ldep->de_dirclust = dirclust; 320 ldep->de_diroffset = diroffset; 321 fc_purge(ldep, 0); /* init the fat cache for this denode */ 322 323 /* 324 * Insert the denode into the hash queue. If a collision occurs 325 * throw away the vnode and try again. 326 */ 327 if (msdosfs_hashins(ldep) != 0) { 328 printf("debug: msdosfs: hashins collision, retrying\n"); 329 vput(nvp); 330 free(ldep, M_MSDOSFSNODE); 331 goto again; 332 } 333 nvp->v_data = ldep; 334 ldep->de_pmp = pmp; 335 ldep->de_refcnt = 1; 336 /* 337 * Copy the directory entry into the denode area of the vnode. 338 */ 339 if ((dirclust == MSDOSFSROOT 340 || (FAT32(pmp) && dirclust == pmp->pm_rootdirblk)) 341 && diroffset == MSDOSFSROOT_OFS) { 342 /* 343 * Directory entry for the root directory. There isn't one, 344 * so we manufacture one. We should probably rummage 345 * through the root directory and find a label entry (if it 346 * exists), and then use the time and date from that entry 347 * as the time and date for the root denode. 348 */ 349 nvp->v_flag |= VROOT; /* should be further down XXX */ 350 351 ldep->de_Attributes = ATTR_DIRECTORY; 352 ldep->de_LowerCase = 0; 353 if (FAT32(pmp)) 354 ldep->de_StartCluster = pmp->pm_rootdirblk; 355 /* de_FileSize will be filled in further down */ 356 else { 357 ldep->de_StartCluster = MSDOSFSROOT; 358 ldep->de_FileSize = pmp->pm_rootdirsize * DEV_BSIZE; 359 } 360 /* 361 * fill in time and date so that dos2unixtime() doesn't 362 * spit up when called from msdosfs_getattr() with root 363 * denode 364 */ 365 ldep->de_CHun = 0; 366 ldep->de_CTime = 0x0000; /* 00:00:00 */ 367 ldep->de_CDate = (0 << DD_YEAR_SHIFT) | (1 << DD_MONTH_SHIFT) 368 | (1 << DD_DAY_SHIFT); 369 /* Jan 1, 1980 */ 370 ldep->de_ADate = ldep->de_CDate; 371 ldep->de_MTime = ldep->de_CTime; 372 ldep->de_MDate = ldep->de_CDate; 373 /* leave the other fields as garbage */ 374 } else { 375 error = readep(pmp, dirclust, diroffset, &bp, &direntptr); 376 if (error) { 377 /* 378 * The denode does not contain anything useful, so 379 * it would be wrong to leave it on its hash chain. 380 * Arrange for vput() to just forget about it. 381 */ 382 ldep->de_Name[0] = SLOT_DELETED; 383 384 vput(nvp); 385 *depp = NULL; 386 return (error); 387 } 388 DE_INTERNALIZE(ldep, direntptr); 389 brelse(bp); 390 } 391 392 /* 393 * Fill in a few fields of the vnode and finish filling in the 394 * denode. Then return the address of the found denode. 395 */ 396 if (ldep->de_Attributes & ATTR_DIRECTORY) { 397 /* 398 * Since DOS directory entries that describe directories 399 * have 0 in the filesize field, we take this opportunity 400 * to find out the length of the directory and plug it into 401 * the denode structure. 402 */ 403 u_long size; 404 405 /* 406 * XXX Sometimes, these arrives that . entry have cluster 407 * number 0, when it shouldn't. Use real cluster number 408 * instead of what is written in directory entry. 409 */ 410 if ((diroffset == 0) && (ldep->de_StartCluster != dirclust)) { 411 printf("deget(): . entry at clust %ld != %ld\n", 412 dirclust, ldep->de_StartCluster); 413 ldep->de_StartCluster = dirclust; 414 } 415 416 nvp->v_type = VDIR; 417 if (ldep->de_StartCluster != MSDOSFSROOT) { 418 error = pcbmap(ldep, 0xffff, 0, &size, 0); 419 if (error == E2BIG) { 420 ldep->de_FileSize = de_cn2off(pmp, size); 421 error = 0; 422 } else 423 printf("deget(): pcbmap returned %d\n", error); 424 } 425 } else 426 nvp->v_type = VREG; 427 getmicrouptime(&tv); 428 SETHIGH(ldep->de_modrev, tv.tv_sec); 429 SETLOW(ldep->de_modrev, tv.tv_usec * 4294); 430 ldep->de_devvp = pmp->pm_devvp; 431 vref(ldep->de_devvp); 432 *depp = ldep; 433 return (0); 434 } 435 436 int 437 deupdat(struct denode *dep, int waitfor) 438 { 439 int error; 440 struct buf *bp; 441 struct direntry *dirp; 442 struct timespec ts; 443 444 if (DETOV(dep)->v_mount->mnt_flag & MNT_RDONLY) 445 return (0); 446 getnanotime(&ts); 447 DETIMES(dep, &ts, &ts, &ts); 448 if ((dep->de_flag & DE_MODIFIED) == 0) 449 return (0); 450 dep->de_flag &= ~DE_MODIFIED; 451 if (dep->de_Attributes & ATTR_DIRECTORY) 452 return (0); 453 if (dep->de_refcnt <= 0) 454 return (0); 455 error = readde(dep, &bp, &dirp); 456 if (error) 457 return (error); 458 DE_EXTERNALIZE(dirp, dep); 459 if (waitfor) 460 return (bwrite(bp)); 461 else { 462 bdwrite(bp); 463 return (0); 464 } 465 } 466 467 /* 468 * Truncate the file described by dep to the length specified by length. 469 */ 470 int 471 detrunc(struct denode *dep, u_long length, int flags, struct thread *td) 472 { 473 int error; 474 int allerror; 475 u_long eofentry; 476 u_long chaintofree; 477 daddr_t bn; 478 int boff; 479 int isadir = dep->de_Attributes & ATTR_DIRECTORY; 480 struct buf *bp; 481 struct msdosfsmount *pmp = dep->de_pmp; 482 483 #ifdef MSDOSFS_DEBUG 484 printf("detrunc(): file %s, length %lu, flags %x\n", dep->de_Name, length, flags); 485 #endif 486 487 /* 488 * Disallow attempts to truncate the root directory since it is of 489 * fixed size. That's just the way dos filesystems are. We use 490 * the VROOT bit in the vnode because checking for the directory 491 * bit and a startcluster of 0 in the denode is not adequate to 492 * recognize the root directory at this point in a file or 493 * directory's life. 494 */ 495 if ((DETOV(dep)->v_flag & VROOT) && !FAT32(pmp)) { 496 printf("detrunc(): can't truncate root directory, clust %ld, offset %ld\n", 497 dep->de_dirclust, dep->de_diroffset); 498 return (EINVAL); 499 } 500 501 502 if (dep->de_FileSize < length) { 503 vnode_pager_setsize(DETOV(dep), length); 504 return deextend(dep, length); 505 } 506 507 /* 508 * If the desired length is 0 then remember the starting cluster of 509 * the file and set the StartCluster field in the directory entry 510 * to 0. If the desired length is not zero, then get the number of 511 * the last cluster in the shortened file. Then get the number of 512 * the first cluster in the part of the file that is to be freed. 513 * Then set the next cluster pointer in the last cluster of the 514 * file to CLUST_EOFE. 515 */ 516 if (length == 0) { 517 chaintofree = dep->de_StartCluster; 518 dep->de_StartCluster = 0; 519 eofentry = ~0; 520 } else { 521 error = pcbmap(dep, de_clcount(pmp, length) - 1, 0, 522 &eofentry, 0); 523 if (error) { 524 #ifdef MSDOSFS_DEBUG 525 printf("detrunc(): pcbmap fails %d\n", error); 526 #endif 527 return (error); 528 } 529 } 530 531 fc_purge(dep, de_clcount(pmp, length)); 532 533 /* 534 * If the new length is not a multiple of the cluster size then we 535 * must zero the tail end of the new last cluster in case it 536 * becomes part of the file again because of a seek. 537 */ 538 if ((boff = length & pmp->pm_crbomask) != 0) { 539 if (isadir) { 540 bn = cntobn(pmp, eofentry); 541 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, &bp); 542 } else { 543 bn = de_blk(pmp, length); 544 error = bread(DETOV(dep), bn, pmp->pm_bpcluster, &bp); 545 } 546 if (error) { 547 brelse(bp); 548 #ifdef MSDOSFS_DEBUG 549 printf("detrunc(): bread fails %d\n", error); 550 #endif 551 return (error); 552 } 553 /* 554 * is this the right place for it? 555 */ 556 bzero(bp->b_data + boff, pmp->pm_bpcluster - boff); 557 if (flags & IO_SYNC) 558 bwrite(bp); 559 else 560 bdwrite(bp); 561 } 562 563 /* 564 * Write out the updated directory entry. Even if the update fails 565 * we free the trailing clusters. 566 */ 567 dep->de_FileSize = length; 568 if (!isadir) 569 dep->de_flag |= DE_UPDATE|DE_MODIFIED; 570 allerror = vtruncbuf(DETOV(dep), td, length, pmp->pm_bpcluster); 571 #ifdef MSDOSFS_DEBUG 572 if (allerror) 573 printf("detrunc(): vtruncbuf error %d\n", allerror); 574 #endif 575 error = deupdat(dep, 1); 576 if (error && (allerror == 0)) 577 allerror = error; 578 #ifdef MSDOSFS_DEBUG 579 printf("detrunc(): allerror %d, eofentry %lu\n", 580 allerror, eofentry); 581 #endif 582 583 /* 584 * If we need to break the cluster chain for the file then do it 585 * now. 586 */ 587 if (eofentry != ~0) { 588 error = fatentry(FAT_GET_AND_SET, pmp, eofentry, 589 &chaintofree, CLUST_EOFE); 590 if (error) { 591 #ifdef MSDOSFS_DEBUG 592 printf("detrunc(): fatentry errors %d\n", error); 593 #endif 594 return (error); 595 } 596 fc_setcache(dep, FC_LASTFC, de_cluster(pmp, length - 1), 597 eofentry); 598 } 599 600 /* 601 * Now free the clusters removed from the file because of the 602 * truncation. 603 */ 604 if (chaintofree != 0 && !MSDOSFSEOF(pmp, chaintofree)) 605 freeclusterchain(pmp, chaintofree); 606 607 return (allerror); 608 } 609 610 /* 611 * Extend the file described by dep to length specified by length. 612 */ 613 int 614 deextend(struct denode *dep, u_long length) 615 { 616 struct msdosfsmount *pmp = dep->de_pmp; 617 u_long count; 618 int error; 619 620 /* 621 * The root of a DOS filesystem cannot be extended. 622 */ 623 if ((DETOV(dep)->v_flag & VROOT) && !FAT32(pmp)) 624 return (EINVAL); 625 626 /* 627 * Directories cannot be extended. 628 */ 629 if (dep->de_Attributes & ATTR_DIRECTORY) 630 return (EISDIR); 631 632 if (length <= dep->de_FileSize) 633 panic("deextend: file too large"); 634 635 /* 636 * Compute the number of clusters to allocate. 637 */ 638 count = de_clcount(pmp, length) - de_clcount(pmp, dep->de_FileSize); 639 if (count > 0) { 640 if (count > pmp->pm_freeclustercount) 641 return (ENOSPC); 642 error = extendfile(dep, count, NULL, NULL, DE_CLEAR); 643 if (error) { 644 /* truncate the added clusters away again */ 645 (void) detrunc(dep, dep->de_FileSize, 0, NULL); 646 return (error); 647 } 648 } 649 dep->de_FileSize = length; 650 dep->de_flag |= DE_UPDATE|DE_MODIFIED; 651 return (deupdat(dep, 1)); 652 } 653 654 /* 655 * msdosfs_reclaim(struct vnode *a_vp) 656 */ 657 int 658 msdosfs_reclaim(struct vop_reclaim_args *ap) 659 { 660 struct vnode *vp = ap->a_vp; 661 struct denode *dep = VTODE(vp); 662 663 #ifdef MSDOSFS_DEBUG 664 printf("msdosfs_reclaim(): dep %p, file %s, refcnt %ld\n", 665 dep, dep ? dep->de_Name : "?", dep ? dep->de_refcnt : -1); 666 #endif 667 668 if (prtactive && vp->v_usecount != 0) 669 vprint("msdosfs_reclaim(): pushing active", vp); 670 /* 671 * Remove the denode from its hash chain and purge namecache 672 * data associated with the vnode. 673 */ 674 cache_purge(vp); 675 vp->v_data = NULL; 676 if (dep) { 677 msdosfs_hashrem(dep); 678 if (dep->de_devvp) { 679 vrele(dep->de_devvp); 680 dep->de_devvp = 0; 681 } 682 free(dep, M_MSDOSFSNODE); 683 } 684 return (0); 685 } 686 687 /* 688 * msdosfs_inactive(struct vnode *a_vp, struct thread *a_td) 689 */ 690 int 691 msdosfs_inactive(struct vop_inactive_args *ap) 692 { 693 struct vnode *vp = ap->a_vp; 694 struct denode *dep = VTODE(vp); 695 int error = 0; 696 697 #ifdef MSDOSFS_DEBUG 698 printf("msdosfs_inactive(): dep %p, de_Name[0] %x\n", dep, dep->de_Name[0]); 699 #endif 700 701 if (prtactive && vp->v_usecount != 0) 702 vprint("msdosfs_inactive(): pushing active", vp); 703 704 /* 705 * Ignore denodes related to stale file handles. 706 */ 707 if (dep->de_Name[0] == SLOT_DELETED) 708 goto out; 709 710 /* 711 * If the file has been deleted and it is on a read/write 712 * filesystem, then truncate the file, and mark the directory slot 713 * as empty. (This may not be necessary for the dos filesystem.) 714 */ 715 #ifdef MSDOSFS_DEBUG 716 printf("msdosfs_inactive(): dep %p, refcnt %ld, mntflag %x, MNT_RDONLY %x\n", 717 dep, dep->de_refcnt, vp->v_mount->mnt_flag, MNT_RDONLY); 718 #endif 719 if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 720 error = detrunc(dep, (u_long) 0, 0, ap->a_td); 721 dep->de_flag |= DE_UPDATE; 722 dep->de_Name[0] = SLOT_DELETED; 723 } 724 deupdat(dep, 0); 725 726 out: 727 VOP_UNLOCK(vp, NULL, 0, ap->a_td); 728 /* 729 * If we are done with the denode, reclaim it 730 * so that it can be reused immediately. 731 */ 732 #ifdef MSDOSFS_DEBUG 733 printf("msdosfs_inactive(): v_usecount %d, de_Name[0] %x\n", vp->v_usecount, 734 dep->de_Name[0]); 735 #endif 736 if (dep->de_Name[0] == SLOT_DELETED) 737 vrecycle(vp, NULL, ap->a_td); 738 return (error); 739 } 740