1 /* $NetBSD: msdosfs_denode.c,v 1.33 2008/05/16 09:21:59 hannken Exp $ */ 2 3 /*- 4 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. 5 * Copyright (C) 1994, 1995, 1997 TooLs GmbH. 6 * All rights reserved. 7 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by TooLs GmbH. 20 * 4. The name of TooLs GmbH may not be used to endorse or promote products 21 * derived from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 26 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 27 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 28 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 29 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 30 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 31 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 32 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 /* 35 * Written by Paul Popelka (paulp@uts.amdahl.com) 36 * 37 * You can do anything you want with this software, just don't say you wrote 38 * it, and don't remove this notice. 39 * 40 * This software is provided "as is". 41 * 42 * The author supplies this software to be publicly redistributed on the 43 * understanding that the author is not responsible for the correct 44 * functioning of this software in any circumstances and is not liable for 45 * any damages caused by this software. 46 * 47 * October 1992 48 */ 49 50 #include <sys/cdefs.h> 51 __KERNEL_RCSID(0, "$NetBSD: msdosfs_denode.c,v 1.33 2008/05/16 09:21:59 hannken Exp $"); 52 53 #include <sys/param.h> 54 #include <sys/systm.h> 55 #include <sys/mount.h> 56 #include <sys/malloc.h> 57 #include <sys/pool.h> 58 #include <sys/proc.h> 59 #include <sys/buf.h> 60 #include <sys/vnode.h> 61 #include <sys/kernel.h> /* defines "time" */ 62 #include <sys/dirent.h> 63 #include <sys/namei.h> 64 #include <sys/kauth.h> 65 66 #include <uvm/uvm_extern.h> 67 68 #include <fs/msdosfs/bpb.h> 69 #include <fs/msdosfs/msdosfsmount.h> 70 #include <fs/msdosfs/direntry.h> 71 #include <fs/msdosfs/denode.h> 72 #include <fs/msdosfs/fat.h> 73 74 LIST_HEAD(ihashhead, denode) *dehashtbl; 75 u_long dehash; /* size of hash table - 1 */ 76 #define DEHASH(dev, dcl, doff) \ 77 (((dev) + (dcl) + (doff) / sizeof(struct direntry)) & dehash) 78 79 kmutex_t msdosfs_ihash_lock; 80 kmutex_t msdosfs_hashlock; 81 82 struct pool msdosfs_denode_pool; 83 84 extern int prtactive; 85 86 static const struct genfs_ops msdosfs_genfsops = { 87 .gop_size = genfs_size, 88 .gop_alloc = msdosfs_gop_alloc, 89 .gop_write = genfs_gop_write, 90 .gop_markupdate = msdosfs_gop_markupdate, 91 }; 92 93 static struct denode *msdosfs_hashget(dev_t, u_long, u_long, int); 94 static void msdosfs_hashins(struct denode *); 95 static void msdosfs_hashrem(struct denode *); 96 97 MALLOC_DECLARE(M_MSDOSFSFAT); 98 99 void 100 msdosfs_init() 101 { 102 103 malloc_type_attach(M_MSDOSFSMNT); 104 malloc_type_attach(M_MSDOSFSFAT); 105 malloc_type_attach(M_MSDOSFSTMP); 106 pool_init(&msdosfs_denode_pool, sizeof(struct denode), 0, 0, 0, 107 "msdosnopl", &pool_allocator_nointr, IPL_NONE); 108 dehashtbl = hashinit(desiredvnodes / 2, HASH_LIST, true, &dehash); 109 mutex_init(&msdosfs_ihash_lock, MUTEX_DEFAULT, IPL_NONE); 110 mutex_init(&msdosfs_hashlock, MUTEX_DEFAULT, IPL_NONE); 111 } 112 113 /* 114 * Reinitialize inode hash table. 115 */ 116 117 void 118 msdosfs_reinit() 119 { 120 struct denode *dep; 121 struct ihashhead *oldhash, *hash; 122 u_long oldmask, mask, val; 123 int i; 124 125 hash = hashinit(desiredvnodes / 2, HASH_LIST, true, &mask); 126 127 mutex_enter(&msdosfs_ihash_lock); 128 oldhash = dehashtbl; 129 oldmask = dehash; 130 dehashtbl = hash; 131 dehash = mask; 132 for (i = 0; i <= oldmask; i++) { 133 while ((dep = LIST_FIRST(&oldhash[i])) != NULL) { 134 LIST_REMOVE(dep, de_hash); 135 val = DEHASH(dep->de_dev, dep->de_dirclust, 136 dep->de_diroffset); 137 LIST_INSERT_HEAD(&hash[val], dep, de_hash); 138 } 139 } 140 mutex_exit(&msdosfs_ihash_lock); 141 hashdone(oldhash, HASH_LIST, oldmask); 142 } 143 144 void 145 msdosfs_done() 146 { 147 hashdone(dehashtbl, HASH_LIST, dehash); 148 pool_destroy(&msdosfs_denode_pool); 149 mutex_destroy(&msdosfs_ihash_lock); 150 mutex_destroy(&msdosfs_hashlock); 151 malloc_type_detach(M_MSDOSFSTMP); 152 malloc_type_detach(M_MSDOSFSFAT); 153 malloc_type_detach(M_MSDOSFSMNT); 154 } 155 156 static struct denode * 157 msdosfs_hashget(dev, dirclust, diroff, flags) 158 dev_t dev; 159 u_long dirclust; 160 u_long diroff; 161 int flags; 162 { 163 struct denode *dep; 164 struct vnode *vp; 165 166 loop: 167 mutex_enter(&msdosfs_ihash_lock); 168 LIST_FOREACH(dep, &dehashtbl[DEHASH(dev, dirclust, diroff)], de_hash) { 169 if (dirclust == dep->de_dirclust && 170 diroff == dep->de_diroffset && 171 dev == dep->de_dev && 172 dep->de_refcnt != 0) { 173 vp = DETOV(dep); 174 if (flags == 0) { 175 mutex_exit(&msdosfs_ihash_lock); 176 } else { 177 mutex_enter(&vp->v_interlock); 178 mutex_exit(&msdosfs_ihash_lock); 179 if (vget(vp, flags | LK_INTERLOCK)) 180 goto loop; 181 } 182 return (dep); 183 } 184 } 185 mutex_exit(&msdosfs_ihash_lock); 186 return (NULL); 187 } 188 189 static void 190 msdosfs_hashins(dep) 191 struct denode *dep; 192 { 193 struct ihashhead *depp; 194 int val; 195 196 KASSERT(mutex_owned(&msdosfs_hashlock)); 197 198 mutex_enter(&msdosfs_ihash_lock); 199 val = DEHASH(dep->de_dev, dep->de_dirclust, dep->de_diroffset); 200 depp = &dehashtbl[val]; 201 LIST_INSERT_HEAD(depp, dep, de_hash); 202 mutex_exit(&msdosfs_ihash_lock); 203 } 204 205 static void 206 msdosfs_hashrem(dep) 207 struct denode *dep; 208 { 209 mutex_enter(&msdosfs_ihash_lock); 210 LIST_REMOVE(dep, de_hash); 211 mutex_exit(&msdosfs_ihash_lock); 212 } 213 214 /* 215 * If deget() succeeds it returns with the gotten denode locked(). 216 * 217 * pmp - address of msdosfsmount structure of the filesystem containing 218 * the denode of interest. The pm_dev field and the address of 219 * the msdosfsmount structure are used. 220 * dirclust - which cluster bp contains, if dirclust is 0 (root directory) 221 * diroffset is relative to the beginning of the root directory, 222 * otherwise it is cluster relative. 223 * diroffset - offset past begin of cluster of denode we want 224 * depp - returns the address of the gotten denode. 225 */ 226 int 227 deget(pmp, dirclust, diroffset, depp) 228 struct msdosfsmount *pmp; /* so we know the maj/min number */ 229 u_long dirclust; /* cluster this dir entry came from */ 230 u_long diroffset; /* index of entry within the cluster */ 231 struct denode **depp; /* returns the addr of the gotten denode */ 232 { 233 int error; 234 extern int (**msdosfs_vnodeop_p)(void *); 235 struct direntry *direntptr; 236 struct denode *ldep; 237 struct vnode *nvp; 238 struct buf *bp; 239 240 #ifdef MSDOSFS_DEBUG 241 printf("deget(pmp %p, dirclust %lu, diroffset %lx, depp %p)\n", 242 pmp, dirclust, diroffset, depp); 243 #endif 244 245 /* 246 * On FAT32 filesystems, root is a (more or less) normal 247 * directory 248 */ 249 if (FAT32(pmp) && dirclust == MSDOSFSROOT) 250 dirclust = pmp->pm_rootdirblk; 251 252 /* 253 * See if the denode is in the denode cache. Use the location of 254 * the directory entry to compute the hash value. For subdir use 255 * address of "." entry. For root dir (if not FAT32) use cluster 256 * MSDOSFSROOT, offset MSDOSFSROOT_OFS 257 * 258 * NOTE: The check for de_refcnt > 0 below insures the denode being 259 * examined does not represent an unlinked but still open file. 260 * These files are not to be accessible even when the directory 261 * entry that represented the file happens to be reused while the 262 * deleted file is still open. 263 */ 264 retry: 265 ldep = msdosfs_hashget(pmp->pm_dev, dirclust, diroffset, LK_EXCLUSIVE); 266 if (ldep) { 267 *depp = ldep; 268 return (0); 269 } 270 271 /* 272 * Directory entry was not in cache, have to create a vnode and 273 * copy it from the passed disk buffer. 274 */ 275 /* getnewvnode() does a VREF() on the vnode */ 276 error = getnewvnode(VT_MSDOSFS, pmp->pm_mountp, 277 msdosfs_vnodeop_p, &nvp); 278 if (error) { 279 *depp = 0; 280 return (error); 281 } 282 ldep = pool_get(&msdosfs_denode_pool, PR_WAITOK); 283 284 /* 285 * If someone beat us to it, put back the freshly allocated 286 * vnode/inode pair and retry. 287 */ 288 mutex_enter(&msdosfs_hashlock); 289 if (msdosfs_hashget(pmp->pm_dev, dirclust, diroffset, 0)) { 290 mutex_exit(&msdosfs_hashlock); 291 ungetnewvnode(nvp); 292 pool_put(&msdosfs_denode_pool, ldep); 293 goto retry; 294 } 295 memset(ldep, 0, sizeof *ldep); 296 nvp->v_data = ldep; 297 ldep->de_vnode = nvp; 298 ldep->de_flag = 0; 299 ldep->de_devvp = 0; 300 ldep->de_lockf = 0; 301 ldep->de_dev = pmp->pm_dev; 302 ldep->de_dirclust = dirclust; 303 ldep->de_diroffset = diroffset; 304 fc_purge(ldep, 0); /* init the fat cache for this denode */ 305 306 /* 307 * Insert the denode into the hash queue and lock the denode so it 308 * can't be accessed until we've read it in and have done what we 309 * need to it. 310 */ 311 vn_lock(nvp, LK_EXCLUSIVE | LK_RETRY); 312 genfs_node_init(nvp, &msdosfs_genfsops); 313 msdosfs_hashins(ldep); 314 mutex_exit(&msdosfs_hashlock); 315 316 ldep->de_pmp = pmp; 317 ldep->de_devvp = pmp->pm_devvp; 318 ldep->de_refcnt = 1; 319 /* 320 * Copy the directory entry into the denode area of the vnode. 321 */ 322 if ((dirclust == MSDOSFSROOT 323 || (FAT32(pmp) && dirclust == pmp->pm_rootdirblk)) 324 && diroffset == MSDOSFSROOT_OFS) { 325 /* 326 * Directory entry for the root directory. There isn't one, 327 * so we manufacture one. We should probably rummage 328 * through the root directory and find a label entry (if it 329 * exists), and then use the time and date from that entry 330 * as the time and date for the root denode. 331 */ 332 nvp->v_vflag |= VV_ROOT; /* should be further down XXX */ 333 334 ldep->de_Attributes = ATTR_DIRECTORY; 335 if (FAT32(pmp)) 336 ldep->de_StartCluster = pmp->pm_rootdirblk; 337 /* de_FileSize will be filled in further down */ 338 else { 339 ldep->de_StartCluster = MSDOSFSROOT; 340 ldep->de_FileSize = pmp->pm_rootdirsize * pmp->pm_BytesPerSec; 341 } 342 /* 343 * fill in time and date so that dos2unixtime() doesn't 344 * spit up when called from msdosfs_getattr() with root 345 * denode 346 */ 347 ldep->de_CHun = 0; 348 ldep->de_CTime = 0x0000; /* 00:00:00 */ 349 ldep->de_CDate = (0 << DD_YEAR_SHIFT) | (1 << DD_MONTH_SHIFT) 350 | (1 << DD_DAY_SHIFT); 351 /* Jan 1, 1980 */ 352 ldep->de_ADate = ldep->de_CDate; 353 ldep->de_MTime = ldep->de_CTime; 354 ldep->de_MDate = ldep->de_CDate; 355 /* leave the other fields as garbage */ 356 } else { 357 error = readep(pmp, dirclust, diroffset, &bp, &direntptr); 358 if (error) { 359 ldep->de_devvp = NULL; 360 ldep->de_Name[0] = SLOT_DELETED; 361 vput(nvp); 362 return (error); 363 } 364 DE_INTERNALIZE(ldep, direntptr); 365 brelse(bp, 0); 366 } 367 368 /* 369 * Fill in a few fields of the vnode and finish filling in the 370 * denode. Then return the address of the found denode. 371 */ 372 if (ldep->de_Attributes & ATTR_DIRECTORY) { 373 /* 374 * Since DOS directory entries that describe directories 375 * have 0 in the filesize field, we take this opportunity 376 * to find out the length of the directory and plug it into 377 * the denode structure. 378 */ 379 u_long size; 380 381 nvp->v_type = VDIR; 382 if (ldep->de_StartCluster != MSDOSFSROOT) { 383 error = pcbmap(ldep, CLUST_END, 0, &size, 0); 384 if (error == E2BIG) { 385 ldep->de_FileSize = de_cn2off(pmp, size); 386 error = 0; 387 } else 388 printf("deget(): pcbmap returned %d\n", error); 389 } 390 } else 391 nvp->v_type = VREG; 392 VREF(ldep->de_devvp); 393 *depp = ldep; 394 uvm_vnp_setsize(nvp, ldep->de_FileSize); 395 return (0); 396 } 397 398 int 399 deupdat(dep, waitfor) 400 struct denode *dep; 401 int waitfor; 402 { 403 404 return (msdosfs_update(DETOV(dep), NULL, NULL, 405 waitfor ? UPDATE_WAIT : 0)); 406 } 407 408 /* 409 * Truncate the file described by dep to the length specified by length. 410 */ 411 int 412 detrunc(struct denode *dep, u_long length, int flags, kauth_cred_t cred) 413 { 414 int error; 415 int allerror; 416 u_long eofentry; 417 u_long chaintofree = 0; 418 daddr_t bn, lastblock; 419 int boff; 420 int isadir = dep->de_Attributes & ATTR_DIRECTORY; 421 struct buf *bp; 422 struct msdosfsmount *pmp = dep->de_pmp; 423 424 #ifdef MSDOSFS_DEBUG 425 printf("detrunc(): file %s, length %lu, flags %x\n", dep->de_Name, length, flags); 426 #endif 427 428 /* 429 * Disallow attempts to truncate the root directory since it is of 430 * fixed size. That's just the way dos filesystems are. We use 431 * the VROOT bit in the vnode because checking for the directory 432 * bit and a startcluster of 0 in the denode is not adequate to 433 * recognize the root directory at this point in a file or 434 * directory's life. 435 */ 436 if ((DETOV(dep)->v_vflag & VV_ROOT) && !FAT32(pmp)) { 437 printf("detrunc(): can't truncate root directory, clust %ld, offset %ld\n", 438 dep->de_dirclust, dep->de_diroffset); 439 return (EINVAL); 440 } 441 442 uvm_vnp_setsize(DETOV(dep), length); 443 444 if (dep->de_FileSize < length) 445 return (deextend(dep, length, cred)); 446 lastblock = de_clcount(pmp, length) - 1; 447 448 /* 449 * If the desired length is 0 then remember the starting cluster of 450 * the file and set the StartCluster field in the directory entry 451 * to 0. If the desired length is not zero, then get the number of 452 * the last cluster in the shortened file. Then get the number of 453 * the first cluster in the part of the file that is to be freed. 454 * Then set the next cluster pointer in the last cluster of the 455 * file to CLUST_EOFE. 456 */ 457 if (length == 0) { 458 chaintofree = dep->de_StartCluster; 459 dep->de_StartCluster = 0; 460 eofentry = ~0; 461 } else { 462 error = pcbmap(dep, lastblock, 0, &eofentry, 0); 463 if (error) { 464 #ifdef MSDOSFS_DEBUG 465 printf("detrunc(): pcbmap fails %d\n", error); 466 #endif 467 return (error); 468 } 469 } 470 471 fc_purge(dep, lastblock + 1); 472 473 /* 474 * If the new length is not a multiple of the cluster size then we 475 * must zero the tail end of the new last cluster in case it 476 * becomes part of the file again because of a seek. 477 */ 478 if ((boff = length & pmp->pm_crbomask) != 0) { 479 if (isadir) { 480 bn = cntobn(pmp, eofentry); 481 error = bread(pmp->pm_devvp, de_bn2kb(pmp, bn), 482 pmp->pm_bpcluster, NOCRED, B_MODIFY, &bp); 483 if (error) { 484 brelse(bp, 0); 485 #ifdef MSDOSFS_DEBUG 486 printf("detrunc(): bread fails %d\n", error); 487 #endif 488 return (error); 489 } 490 memset((char *)bp->b_data + boff, 0, 491 pmp->pm_bpcluster - boff); 492 if (flags & IO_SYNC) 493 bwrite(bp); 494 else 495 bdwrite(bp); 496 } else { 497 uvm_vnp_zerorange(DETOV(dep), length, 498 pmp->pm_bpcluster - boff); 499 } 500 } 501 502 /* 503 * Write out the updated directory entry. Even if the update fails 504 * we free the trailing clusters. 505 */ 506 dep->de_FileSize = length; 507 if (!isadir) 508 dep->de_flag |= DE_UPDATE|DE_MODIFIED; 509 vtruncbuf(DETOV(dep), lastblock + 1, 0, 0); 510 allerror = deupdat(dep, 1); 511 #ifdef MSDOSFS_DEBUG 512 printf("detrunc(): allerror %d, eofentry %lu\n", 513 allerror, eofentry); 514 #endif 515 516 /* 517 * If we need to break the cluster chain for the file then do it 518 * now. 519 */ 520 if (eofentry != ~0) { 521 error = fatentry(FAT_GET_AND_SET, pmp, eofentry, 522 &chaintofree, CLUST_EOFE); 523 if (error) { 524 #ifdef MSDOSFS_DEBUG 525 printf("detrunc(): fatentry errors %d\n", error); 526 #endif 527 return (error); 528 } 529 fc_setcache(dep, FC_LASTFC, de_cluster(pmp, length - 1), 530 eofentry); 531 } 532 533 /* 534 * Now free the clusters removed from the file because of the 535 * truncation. 536 */ 537 if (chaintofree != 0 && !MSDOSFSEOF(chaintofree, pmp->pm_fatmask)) 538 freeclusterchain(pmp, chaintofree); 539 540 return (allerror); 541 } 542 543 /* 544 * Extend the file described by dep to length specified by length. 545 */ 546 int 547 deextend(dep, length, cred) 548 struct denode *dep; 549 u_long length; 550 kauth_cred_t cred; 551 { 552 struct msdosfsmount *pmp = dep->de_pmp; 553 u_long count, osize; 554 int error; 555 556 /* 557 * The root of a DOS filesystem cannot be extended. 558 */ 559 if ((DETOV(dep)->v_vflag & VV_ROOT) && !FAT32(pmp)) 560 return (EINVAL); 561 562 /* 563 * Directories cannot be extended. 564 */ 565 if (dep->de_Attributes & ATTR_DIRECTORY) 566 return (EISDIR); 567 568 if (length <= dep->de_FileSize) 569 panic("deextend: file too large"); 570 571 /* 572 * Compute the number of clusters to allocate. 573 */ 574 count = de_clcount(pmp, length) - de_clcount(pmp, dep->de_FileSize); 575 if (count > 0) { 576 if (count > pmp->pm_freeclustercount) 577 return (ENOSPC); 578 error = extendfile(dep, count, NULL, NULL, DE_CLEAR); 579 if (error) { 580 /* truncate the added clusters away again */ 581 (void) detrunc(dep, dep->de_FileSize, 0, cred); 582 return (error); 583 } 584 } 585 586 /* 587 * Zero extend file range; uvm_vnp_zerorange() uses ubc_alloc() and a 588 * memset(); we set the write size so ubc won't read in file data that 589 * is zero'd later. 590 */ 591 osize = dep->de_FileSize; 592 dep->de_FileSize = length; 593 uvm_vnp_setwritesize(DETOV(dep), (voff_t)dep->de_FileSize); 594 dep->de_flag |= DE_UPDATE|DE_MODIFIED; 595 uvm_vnp_zerorange(DETOV(dep), (off_t)osize, 596 (size_t)(dep->de_FileSize - osize)); 597 uvm_vnp_setsize(DETOV(dep), (voff_t)dep->de_FileSize); 598 return (deupdat(dep, 1)); 599 } 600 601 /* 602 * Move a denode to its correct hash queue after the file it represents has 603 * been moved to a new directory. 604 */ 605 void 606 reinsert(dep) 607 struct denode *dep; 608 { 609 /* 610 * Fix up the denode cache. If the denode is for a directory, 611 * there is nothing to do since the hash is based on the starting 612 * cluster of the directory file and that hasn't changed. If for a 613 * file the hash is based on the location of the directory entry, 614 * so we must remove it from the cache and re-enter it with the 615 * hash based on the new location of the directory entry. 616 */ 617 if (dep->de_Attributes & ATTR_DIRECTORY) 618 return; 619 mutex_enter(&msdosfs_hashlock); 620 msdosfs_hashrem(dep); 621 msdosfs_hashins(dep); 622 mutex_exit(&msdosfs_hashlock); 623 } 624 625 int 626 msdosfs_reclaim(v) 627 void *v; 628 { 629 struct vop_reclaim_args /* { 630 struct vnode *a_vp; 631 } */ *ap = v; 632 struct vnode *vp = ap->a_vp; 633 struct denode *dep = VTODE(vp); 634 635 #ifdef MSDOSFS_DEBUG 636 printf("msdosfs_reclaim(): dep %p, file %s, refcnt %ld\n", 637 dep, dep->de_Name, dep->de_refcnt); 638 #endif 639 640 if (prtactive && vp->v_usecount > 1) 641 vprint("msdosfs_reclaim(): pushing active", vp); 642 /* 643 * Remove the denode from its hash chain. 644 */ 645 msdosfs_hashrem(dep); 646 /* 647 * Purge old data structures associated with the denode. 648 */ 649 cache_purge(vp); 650 if (dep->de_devvp) { 651 vrele(dep->de_devvp); 652 dep->de_devvp = 0; 653 } 654 #if 0 /* XXX */ 655 dep->de_flag = 0; 656 #endif 657 genfs_node_destroy(vp); 658 pool_put(&msdosfs_denode_pool, dep); 659 vp->v_data = NULL; 660 return (0); 661 } 662 663 int 664 msdosfs_inactive(v) 665 void *v; 666 { 667 struct vop_inactive_args /* { 668 struct vnode *a_vp; 669 bool *a_recycle; 670 } */ *ap = v; 671 struct vnode *vp = ap->a_vp; 672 struct denode *dep = VTODE(vp); 673 int error = 0; 674 675 #ifdef MSDOSFS_DEBUG 676 printf("msdosfs_inactive(): dep %p, de_Name[0] %x\n", dep, dep->de_Name[0]); 677 #endif 678 679 /* 680 * Get rid of denodes related to stale file handles. 681 */ 682 if (dep->de_Name[0] == SLOT_DELETED) 683 goto out; 684 685 /* 686 * If the file has been deleted and it is on a read/write 687 * filesystem, then truncate the file, and mark the directory slot 688 * as empty. (This may not be necessary for the dos filesystem.) 689 */ 690 #ifdef MSDOSFS_DEBUG 691 printf("msdosfs_inactive(): dep %p, refcnt %ld, mntflag %x %s\n", 692 dep, dep->de_refcnt, vp->v_mount->mnt_flag, 693 (vp->v_mount->mnt_flag & MNT_RDONLY) ? "MNT_RDONLY" : ""); 694 #endif 695 if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 696 if (dep->de_FileSize != 0) { 697 error = detrunc(dep, (u_long)0, 0, NOCRED); 698 } 699 dep->de_Name[0] = SLOT_DELETED; 700 } 701 deupdat(dep, 0); 702 out: 703 /* 704 * If we are done with the denode, reclaim it 705 * so that it can be reused immediately. 706 */ 707 #ifdef MSDOSFS_DEBUG 708 printf("msdosfs_inactive(): v_usecount %d, de_Name[0] %x\n", 709 vp->v_usecount, dep->de_Name[0]); 710 #endif 711 *ap->a_recycle = (dep->de_Name[0] == SLOT_DELETED); 712 VOP_UNLOCK(vp, 0); 713 return (error); 714 } 715 716 int 717 msdosfs_gop_alloc(struct vnode *vp, off_t off, 718 off_t len, int flags, kauth_cred_t cred) 719 { 720 return 0; 721 } 722 723 void 724 msdosfs_gop_markupdate(struct vnode *vp, int flags) 725 { 726 u_long mask = 0; 727 728 if ((flags & GOP_UPDATE_ACCESSED) != 0) { 729 mask = DE_ACCESS; 730 } 731 if ((flags & GOP_UPDATE_MODIFIED) != 0) { 732 mask |= DE_UPDATE; 733 } 734 if (mask) { 735 struct denode *dep = VTODE(vp); 736 737 dep->de_flag |= mask; 738 } 739 } 740