1 /* $NetBSD: msdosfs_denode.c,v 1.36 2009/03/15 17:15:57 cegger 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 1.36 2009/03/15 17:15:57 cegger 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(void) 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(void) 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(void) 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_t dev, u_long dirclust, u_long diroff, int flags) 158 { 159 struct denode *dep; 160 struct vnode *vp; 161 162 loop: 163 mutex_enter(&msdosfs_ihash_lock); 164 LIST_FOREACH(dep, &dehashtbl[DEHASH(dev, dirclust, diroff)], de_hash) { 165 if (dirclust == dep->de_dirclust && 166 diroff == dep->de_diroffset && 167 dev == dep->de_dev && 168 dep->de_refcnt != 0) { 169 vp = DETOV(dep); 170 if (flags == 0) { 171 mutex_exit(&msdosfs_ihash_lock); 172 } else { 173 mutex_enter(&vp->v_interlock); 174 mutex_exit(&msdosfs_ihash_lock); 175 if (vget(vp, flags | LK_INTERLOCK)) 176 goto loop; 177 } 178 return (dep); 179 } 180 } 181 mutex_exit(&msdosfs_ihash_lock); 182 return (NULL); 183 } 184 185 static void 186 msdosfs_hashins(struct denode *dep) 187 { 188 struct ihashhead *depp; 189 int val; 190 191 KASSERT(mutex_owned(&msdosfs_hashlock)); 192 193 mutex_enter(&msdosfs_ihash_lock); 194 val = DEHASH(dep->de_dev, dep->de_dirclust, dep->de_diroffset); 195 depp = &dehashtbl[val]; 196 LIST_INSERT_HEAD(depp, dep, de_hash); 197 mutex_exit(&msdosfs_ihash_lock); 198 } 199 200 static void 201 msdosfs_hashrem(struct denode *dep) 202 { 203 mutex_enter(&msdosfs_ihash_lock); 204 LIST_REMOVE(dep, de_hash); 205 mutex_exit(&msdosfs_ihash_lock); 206 } 207 208 /* 209 * If deget() succeeds it returns with the gotten denode locked(). 210 * 211 * pmp - address of msdosfsmount structure of the filesystem containing 212 * the denode of interest. The pm_dev field and the address of 213 * the msdosfsmount structure are used. 214 * dirclust - which cluster bp contains, if dirclust is 0 (root directory) 215 * diroffset is relative to the beginning of the root directory, 216 * otherwise it is cluster relative. 217 * diroffset - offset past begin of cluster of denode we want 218 * depp - returns the address of the gotten denode. 219 */ 220 int 221 deget(struct msdosfsmount *pmp, u_long dirclust, u_long diroffset, struct denode **depp) 222 /* pmp: so we know the maj/min number */ 223 /* dirclust: cluster this dir entry came from */ 224 /* diroffset: index of entry within the cluster */ 225 /* depp: returns the addr of the gotten denode */ 226 { 227 int error; 228 extern int (**msdosfs_vnodeop_p)(void *); 229 struct direntry *direntptr; 230 struct denode *ldep; 231 struct vnode *nvp; 232 struct buf *bp; 233 234 #ifdef MSDOSFS_DEBUG 235 printf("deget(pmp %p, dirclust %lu, diroffset %lx, depp %p)\n", 236 pmp, dirclust, diroffset, depp); 237 #endif 238 239 /* 240 * On FAT32 filesystems, root is a (more or less) normal 241 * directory 242 */ 243 if (FAT32(pmp) && dirclust == MSDOSFSROOT) 244 dirclust = pmp->pm_rootdirblk; 245 246 /* 247 * See if the denode is in the denode cache. Use the location of 248 * the directory entry to compute the hash value. For subdir use 249 * address of "." entry. For root dir (if not FAT32) use cluster 250 * MSDOSFSROOT, offset MSDOSFSROOT_OFS 251 * 252 * NOTE: The check for de_refcnt > 0 below insures the denode being 253 * examined does not represent an unlinked but still open file. 254 * These files are not to be accessible even when the directory 255 * entry that represented the file happens to be reused while the 256 * deleted file is still open. 257 */ 258 retry: 259 ldep = msdosfs_hashget(pmp->pm_dev, dirclust, diroffset, LK_EXCLUSIVE); 260 if (ldep) { 261 *depp = ldep; 262 return (0); 263 } 264 265 /* 266 * Directory entry was not in cache, have to create a vnode and 267 * copy it from the passed disk buffer. 268 */ 269 /* getnewvnode() does a VREF() on the vnode */ 270 error = getnewvnode(VT_MSDOSFS, pmp->pm_mountp, 271 msdosfs_vnodeop_p, &nvp); 272 if (error) { 273 *depp = 0; 274 return (error); 275 } 276 ldep = pool_get(&msdosfs_denode_pool, PR_WAITOK); 277 278 /* 279 * If someone beat us to it, put back the freshly allocated 280 * vnode/inode pair and retry. 281 */ 282 mutex_enter(&msdosfs_hashlock); 283 if (msdosfs_hashget(pmp->pm_dev, dirclust, diroffset, 0)) { 284 mutex_exit(&msdosfs_hashlock); 285 ungetnewvnode(nvp); 286 pool_put(&msdosfs_denode_pool, ldep); 287 goto retry; 288 } 289 memset(ldep, 0, sizeof *ldep); 290 nvp->v_data = ldep; 291 ldep->de_vnode = nvp; 292 ldep->de_flag = 0; 293 ldep->de_devvp = 0; 294 ldep->de_lockf = 0; 295 ldep->de_dev = pmp->pm_dev; 296 ldep->de_dirclust = dirclust; 297 ldep->de_diroffset = diroffset; 298 fc_purge(ldep, 0); /* init the fat cache for this denode */ 299 300 /* 301 * Insert the denode into the hash queue and lock the denode so it 302 * can't be accessed until we've read it in and have done what we 303 * need to it. 304 */ 305 vn_lock(nvp, LK_EXCLUSIVE | LK_RETRY); 306 genfs_node_init(nvp, &msdosfs_genfsops); 307 msdosfs_hashins(ldep); 308 mutex_exit(&msdosfs_hashlock); 309 310 ldep->de_pmp = pmp; 311 ldep->de_devvp = pmp->pm_devvp; 312 ldep->de_refcnt = 1; 313 /* 314 * Copy the directory entry into the denode area of the vnode. 315 */ 316 if ((dirclust == MSDOSFSROOT 317 || (FAT32(pmp) && dirclust == pmp->pm_rootdirblk)) 318 && diroffset == MSDOSFSROOT_OFS) { 319 /* 320 * Directory entry for the root directory. There isn't one, 321 * so we manufacture one. We should probably rummage 322 * through the root directory and find a label entry (if it 323 * exists), and then use the time and date from that entry 324 * as the time and date for the root denode. 325 */ 326 nvp->v_vflag |= VV_ROOT; /* should be further down XXX */ 327 328 ldep->de_Attributes = ATTR_DIRECTORY; 329 if (FAT32(pmp)) 330 ldep->de_StartCluster = pmp->pm_rootdirblk; 331 /* de_FileSize will be filled in further down */ 332 else { 333 ldep->de_StartCluster = MSDOSFSROOT; 334 ldep->de_FileSize = pmp->pm_rootdirsize * pmp->pm_BytesPerSec; 335 } 336 /* 337 * fill in time and date so that dos2unixtime() doesn't 338 * spit up when called from msdosfs_getattr() with root 339 * denode 340 */ 341 ldep->de_CHun = 0; 342 ldep->de_CTime = 0x0000; /* 00:00:00 */ 343 ldep->de_CDate = (0 << DD_YEAR_SHIFT) | (1 << DD_MONTH_SHIFT) 344 | (1 << DD_DAY_SHIFT); 345 /* Jan 1, 1980 */ 346 ldep->de_ADate = ldep->de_CDate; 347 ldep->de_MTime = ldep->de_CTime; 348 ldep->de_MDate = ldep->de_CDate; 349 /* leave the other fields as garbage */ 350 } else { 351 error = readep(pmp, dirclust, diroffset, &bp, &direntptr); 352 if (error) { 353 ldep->de_devvp = NULL; 354 ldep->de_Name[0] = SLOT_DELETED; 355 vput(nvp); 356 return (error); 357 } 358 DE_INTERNALIZE(ldep, direntptr); 359 brelse(bp, 0); 360 } 361 362 /* 363 * Fill in a few fields of the vnode and finish filling in the 364 * denode. Then return the address of the found denode. 365 */ 366 if (ldep->de_Attributes & ATTR_DIRECTORY) { 367 /* 368 * Since DOS directory entries that describe directories 369 * have 0 in the filesize field, we take this opportunity 370 * to find out the length of the directory and plug it into 371 * the denode structure. 372 */ 373 u_long size; 374 375 nvp->v_type = VDIR; 376 if (ldep->de_StartCluster != MSDOSFSROOT) { 377 error = pcbmap(ldep, CLUST_END, 0, &size, 0); 378 if (error == E2BIG) { 379 ldep->de_FileSize = de_cn2off(pmp, size); 380 error = 0; 381 } else 382 printf("deget(): pcbmap returned %d\n", error); 383 } 384 } else 385 nvp->v_type = VREG; 386 VREF(ldep->de_devvp); 387 *depp = ldep; 388 uvm_vnp_setsize(nvp, ldep->de_FileSize); 389 return (0); 390 } 391 392 int 393 deupdat(struct denode *dep, int waitfor) 394 { 395 396 return (msdosfs_update(DETOV(dep), NULL, NULL, 397 waitfor ? UPDATE_WAIT : 0)); 398 } 399 400 /* 401 * Truncate the file described by dep to the length specified by length. 402 */ 403 int 404 detrunc(struct denode *dep, u_long length, int flags, kauth_cred_t cred) 405 { 406 int error; 407 int allerror; 408 u_long eofentry; 409 u_long chaintofree = 0; 410 daddr_t bn, lastblock; 411 int boff; 412 int isadir = dep->de_Attributes & ATTR_DIRECTORY; 413 struct buf *bp; 414 struct msdosfsmount *pmp = dep->de_pmp; 415 416 #ifdef MSDOSFS_DEBUG 417 printf("detrunc(): file %s, length %lu, flags %x\n", dep->de_Name, length, flags); 418 #endif 419 420 /* 421 * Disallow attempts to truncate the root directory since it is of 422 * fixed size. That's just the way dos filesystems are. We use 423 * the VROOT bit in the vnode because checking for the directory 424 * bit and a startcluster of 0 in the denode is not adequate to 425 * recognize the root directory at this point in a file or 426 * directory's life. 427 */ 428 if ((DETOV(dep)->v_vflag & VV_ROOT) && !FAT32(pmp)) { 429 printf("detrunc(): can't truncate root directory, clust %ld, offset %ld\n", 430 dep->de_dirclust, dep->de_diroffset); 431 return (EINVAL); 432 } 433 434 uvm_vnp_setsize(DETOV(dep), length); 435 436 if (dep->de_FileSize < length) 437 return (deextend(dep, length, cred)); 438 lastblock = de_clcount(pmp, length) - 1; 439 440 /* 441 * If the desired length is 0 then remember the starting cluster of 442 * the file and set the StartCluster field in the directory entry 443 * to 0. If the desired length is not zero, then get the number of 444 * the last cluster in the shortened file. Then get the number of 445 * the first cluster in the part of the file that is to be freed. 446 * Then set the next cluster pointer in the last cluster of the 447 * file to CLUST_EOFE. 448 */ 449 if (length == 0) { 450 chaintofree = dep->de_StartCluster; 451 dep->de_StartCluster = 0; 452 eofentry = ~0; 453 } else { 454 error = pcbmap(dep, lastblock, 0, &eofentry, 0); 455 if (error) { 456 #ifdef MSDOSFS_DEBUG 457 printf("detrunc(): pcbmap fails %d\n", error); 458 #endif 459 return (error); 460 } 461 } 462 463 fc_purge(dep, lastblock + 1); 464 465 /* 466 * If the new length is not a multiple of the cluster size then we 467 * must zero the tail end of the new last cluster in case it 468 * becomes part of the file again because of a seek. 469 */ 470 if ((boff = length & pmp->pm_crbomask) != 0) { 471 if (isadir) { 472 bn = cntobn(pmp, eofentry); 473 error = bread(pmp->pm_devvp, de_bn2kb(pmp, bn), 474 pmp->pm_bpcluster, NOCRED, B_MODIFY, &bp); 475 if (error) { 476 brelse(bp, 0); 477 #ifdef MSDOSFS_DEBUG 478 printf("detrunc(): bread fails %d\n", error); 479 #endif 480 return (error); 481 } 482 memset((char *)bp->b_data + boff, 0, 483 pmp->pm_bpcluster - boff); 484 if (flags & IO_SYNC) 485 bwrite(bp); 486 else 487 bdwrite(bp); 488 } else { 489 uvm_vnp_zerorange(DETOV(dep), length, 490 pmp->pm_bpcluster - boff); 491 } 492 } 493 494 /* 495 * Write out the updated directory entry. Even if the update fails 496 * we free the trailing clusters. 497 */ 498 dep->de_FileSize = length; 499 if (!isadir) 500 dep->de_flag |= DE_UPDATE|DE_MODIFIED; 501 vtruncbuf(DETOV(dep), lastblock + 1, 0, 0); 502 allerror = deupdat(dep, 1); 503 #ifdef MSDOSFS_DEBUG 504 printf("detrunc(): allerror %d, eofentry %lu\n", 505 allerror, eofentry); 506 #endif 507 508 /* 509 * If we need to break the cluster chain for the file then do it 510 * now. 511 */ 512 if (eofentry != ~0) { 513 error = fatentry(FAT_GET_AND_SET, pmp, eofentry, 514 &chaintofree, CLUST_EOFE); 515 if (error) { 516 #ifdef MSDOSFS_DEBUG 517 printf("detrunc(): fatentry errors %d\n", error); 518 #endif 519 return (error); 520 } 521 fc_setcache(dep, FC_LASTFC, de_cluster(pmp, length - 1), 522 eofentry); 523 } 524 525 /* 526 * Now free the clusters removed from the file because of the 527 * truncation. 528 */ 529 if (chaintofree != 0 && !MSDOSFSEOF(chaintofree, pmp->pm_fatmask)) 530 freeclusterchain(pmp, chaintofree); 531 532 return (allerror); 533 } 534 535 /* 536 * Extend the file described by dep to length specified by length. 537 */ 538 int 539 deextend(struct denode *dep, u_long length, kauth_cred_t cred) 540 { 541 struct msdosfsmount *pmp = dep->de_pmp; 542 u_long count, osize; 543 int error; 544 545 /* 546 * The root of a DOS filesystem cannot be extended. 547 */ 548 if ((DETOV(dep)->v_vflag & VV_ROOT) && !FAT32(pmp)) 549 return (EINVAL); 550 551 /* 552 * Directories cannot be extended. 553 */ 554 if (dep->de_Attributes & ATTR_DIRECTORY) 555 return (EISDIR); 556 557 if (length <= dep->de_FileSize) 558 panic("deextend: file too large"); 559 560 /* 561 * Compute the number of clusters to allocate. 562 */ 563 count = de_clcount(pmp, length) - de_clcount(pmp, dep->de_FileSize); 564 if (count > 0) { 565 if (count > pmp->pm_freeclustercount) 566 return (ENOSPC); 567 error = extendfile(dep, count, NULL, NULL, DE_CLEAR); 568 if (error) { 569 /* truncate the added clusters away again */ 570 (void) detrunc(dep, dep->de_FileSize, 0, cred); 571 return (error); 572 } 573 } 574 575 /* 576 * Zero extend file range; uvm_vnp_zerorange() uses ubc_alloc() and a 577 * memset(); we set the write size so ubc won't read in file data that 578 * is zero'd later. 579 */ 580 osize = dep->de_FileSize; 581 dep->de_FileSize = length; 582 uvm_vnp_setwritesize(DETOV(dep), (voff_t)dep->de_FileSize); 583 dep->de_flag |= DE_UPDATE|DE_MODIFIED; 584 uvm_vnp_zerorange(DETOV(dep), (off_t)osize, 585 (size_t)(dep->de_FileSize - osize)); 586 uvm_vnp_setsize(DETOV(dep), (voff_t)dep->de_FileSize); 587 return (deupdat(dep, 1)); 588 } 589 590 /* 591 * Move a denode to its correct hash queue after the file it represents has 592 * been moved to a new directory. 593 */ 594 void 595 reinsert(struct denode *dep) 596 { 597 /* 598 * Fix up the denode cache. If the denode is for a directory, 599 * there is nothing to do since the hash is based on the starting 600 * cluster of the directory file and that hasn't changed. If for a 601 * file the hash is based on the location of the directory entry, 602 * so we must remove it from the cache and re-enter it with the 603 * hash based on the new location of the directory entry. 604 */ 605 if (dep->de_Attributes & ATTR_DIRECTORY) 606 return; 607 mutex_enter(&msdosfs_hashlock); 608 msdosfs_hashrem(dep); 609 msdosfs_hashins(dep); 610 mutex_exit(&msdosfs_hashlock); 611 } 612 613 int 614 msdosfs_reclaim(void *v) 615 { 616 struct vop_reclaim_args /* { 617 struct vnode *a_vp; 618 } */ *ap = v; 619 struct vnode *vp = ap->a_vp; 620 struct denode *dep = VTODE(vp); 621 622 #ifdef MSDOSFS_DEBUG 623 printf("msdosfs_reclaim(): dep %p, file %s, refcnt %ld\n", 624 dep, dep->de_Name, dep->de_refcnt); 625 #endif 626 627 if (prtactive && vp->v_usecount > 1) 628 vprint("msdosfs_reclaim(): pushing active", vp); 629 /* 630 * Remove the denode from its hash chain. 631 */ 632 msdosfs_hashrem(dep); 633 /* 634 * Purge old data structures associated with the denode. 635 */ 636 cache_purge(vp); 637 if (dep->de_devvp) { 638 vrele(dep->de_devvp); 639 dep->de_devvp = 0; 640 } 641 #if 0 /* XXX */ 642 dep->de_flag = 0; 643 #endif 644 genfs_node_destroy(vp); 645 pool_put(&msdosfs_denode_pool, dep); 646 vp->v_data = NULL; 647 return (0); 648 } 649 650 int 651 msdosfs_inactive(void *v) 652 { 653 struct vop_inactive_args /* { 654 struct vnode *a_vp; 655 bool *a_recycle; 656 } */ *ap = v; 657 struct vnode *vp = ap->a_vp; 658 struct denode *dep = VTODE(vp); 659 int error = 0; 660 661 #ifdef MSDOSFS_DEBUG 662 printf("msdosfs_inactive(): dep %p, de_Name[0] %x\n", dep, dep->de_Name[0]); 663 #endif 664 665 /* 666 * Get rid of denodes related to stale file handles. 667 */ 668 if (dep->de_Name[0] == SLOT_DELETED) 669 goto out; 670 671 /* 672 * If the file has been deleted and it is on a read/write 673 * filesystem, then truncate the file, and mark the directory slot 674 * as empty. (This may not be necessary for the dos filesystem.) 675 */ 676 #ifdef MSDOSFS_DEBUG 677 printf("msdosfs_inactive(): dep %p, refcnt %ld, mntflag %x %s\n", 678 dep, dep->de_refcnt, vp->v_mount->mnt_flag, 679 (vp->v_mount->mnt_flag & MNT_RDONLY) ? "MNT_RDONLY" : ""); 680 #endif 681 if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 682 if (dep->de_FileSize != 0) { 683 error = detrunc(dep, (u_long)0, 0, NOCRED); 684 } 685 dep->de_Name[0] = SLOT_DELETED; 686 } 687 deupdat(dep, 0); 688 out: 689 /* 690 * If we are done with the denode, reclaim it 691 * so that it can be reused immediately. 692 */ 693 #ifdef MSDOSFS_DEBUG 694 printf("msdosfs_inactive(): v_usecount %d, de_Name[0] %x\n", 695 vp->v_usecount, dep->de_Name[0]); 696 #endif 697 *ap->a_recycle = (dep->de_Name[0] == SLOT_DELETED); 698 VOP_UNLOCK(vp, 0); 699 return (error); 700 } 701 702 int 703 msdosfs_gop_alloc(struct vnode *vp, off_t off, 704 off_t len, int flags, kauth_cred_t cred) 705 { 706 return 0; 707 } 708 709 void 710 msdosfs_gop_markupdate(struct vnode *vp, int flags) 711 { 712 u_long mask = 0; 713 714 if ((flags & GOP_UPDATE_ACCESSED) != 0) { 715 mask = DE_ACCESS; 716 } 717 if ((flags & GOP_UPDATE_MODIFIED) != 0) { 718 mask |= DE_UPDATE; 719 } 720 if (mask) { 721 struct denode *dep = VTODE(vp); 722 723 dep->de_flag |= mask; 724 } 725 } 726