1 /* $NetBSD: msdosfs_denode.c,v 1.40 2010/07/21 17:52:10 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 1.40 2010/07/21 17:52:10 hannken Exp $"); 52 53 #include <sys/param.h> 54 #include <sys/systm.h> 55 #include <sys/mount.h> 56 #include <sys/fstrans.h> 57 #include <sys/malloc.h> 58 #include <sys/pool.h> 59 #include <sys/proc.h> 60 #include <sys/buf.h> 61 #include <sys/vnode.h> 62 #include <sys/kernel.h> /* defines "time" */ 63 #include <sys/dirent.h> 64 #include <sys/namei.h> 65 #include <sys/kauth.h> 66 67 #include <uvm/uvm_extern.h> 68 69 #include <fs/msdosfs/bpb.h> 70 #include <fs/msdosfs/msdosfsmount.h> 71 #include <fs/msdosfs/direntry.h> 72 #include <fs/msdosfs/denode.h> 73 #include <fs/msdosfs/fat.h> 74 75 LIST_HEAD(ihashhead, denode) *dehashtbl; 76 u_long dehash; /* size of hash table - 1 */ 77 #define DEHASH(dev, dcl, doff) \ 78 (((dev) + (dcl) + (doff) / sizeof(struct direntry)) & dehash) 79 80 kmutex_t msdosfs_ihash_lock; 81 kmutex_t msdosfs_hashlock; 82 83 struct pool msdosfs_denode_pool; 84 85 extern int prtactive; 86 87 static const struct genfs_ops msdosfs_genfsops = { 88 .gop_size = genfs_size, 89 .gop_alloc = msdosfs_gop_alloc, 90 .gop_write = genfs_gop_write, 91 .gop_markupdate = msdosfs_gop_markupdate, 92 }; 93 94 static struct denode *msdosfs_hashget(dev_t, u_long, u_long, int); 95 static void msdosfs_hashins(struct denode *); 96 static void msdosfs_hashrem(struct denode *); 97 98 MALLOC_DECLARE(M_MSDOSFSFAT); 99 100 void 101 msdosfs_init(void) 102 { 103 104 malloc_type_attach(M_MSDOSFSMNT); 105 malloc_type_attach(M_MSDOSFSFAT); 106 malloc_type_attach(M_MSDOSFSTMP); 107 pool_init(&msdosfs_denode_pool, sizeof(struct denode), 0, 0, 0, 108 "msdosnopl", &pool_allocator_nointr, IPL_NONE); 109 dehashtbl = hashinit(desiredvnodes / 2, HASH_LIST, true, &dehash); 110 mutex_init(&msdosfs_ihash_lock, MUTEX_DEFAULT, IPL_NONE); 111 mutex_init(&msdosfs_hashlock, MUTEX_DEFAULT, IPL_NONE); 112 } 113 114 /* 115 * Reinitialize inode hash table. 116 */ 117 118 void 119 msdosfs_reinit(void) 120 { 121 struct denode *dep; 122 struct ihashhead *oldhash, *hash; 123 u_long oldmask, mask, val; 124 int i; 125 126 hash = hashinit(desiredvnodes / 2, HASH_LIST, true, &mask); 127 128 mutex_enter(&msdosfs_ihash_lock); 129 oldhash = dehashtbl; 130 oldmask = dehash; 131 dehashtbl = hash; 132 dehash = mask; 133 for (i = 0; i <= oldmask; i++) { 134 while ((dep = LIST_FIRST(&oldhash[i])) != NULL) { 135 LIST_REMOVE(dep, de_hash); 136 val = DEHASH(dep->de_dev, dep->de_dirclust, 137 dep->de_diroffset); 138 LIST_INSERT_HEAD(&hash[val], dep, de_hash); 139 } 140 } 141 mutex_exit(&msdosfs_ihash_lock); 142 hashdone(oldhash, HASH_LIST, oldmask); 143 } 144 145 void 146 msdosfs_done(void) 147 { 148 hashdone(dehashtbl, HASH_LIST, dehash); 149 pool_destroy(&msdosfs_denode_pool); 150 mutex_destroy(&msdosfs_ihash_lock); 151 mutex_destroy(&msdosfs_hashlock); 152 malloc_type_detach(M_MSDOSFSTMP); 153 malloc_type_detach(M_MSDOSFSFAT); 154 malloc_type_detach(M_MSDOSFSMNT); 155 } 156 157 static struct denode * 158 msdosfs_hashget(dev_t dev, u_long dirclust, u_long diroff, int flags) 159 { 160 struct denode *dep; 161 struct vnode *vp; 162 163 loop: 164 mutex_enter(&msdosfs_ihash_lock); 165 LIST_FOREACH(dep, &dehashtbl[DEHASH(dev, dirclust, diroff)], de_hash) { 166 if (dirclust == dep->de_dirclust && 167 diroff == dep->de_diroffset && 168 dev == dep->de_dev && 169 dep->de_refcnt != 0) { 170 vp = DETOV(dep); 171 if (flags == 0) { 172 mutex_exit(&msdosfs_ihash_lock); 173 } else { 174 mutex_enter(&vp->v_interlock); 175 mutex_exit(&msdosfs_ihash_lock); 176 if (vget(vp, flags)) 177 goto loop; 178 } 179 return (dep); 180 } 181 } 182 mutex_exit(&msdosfs_ihash_lock); 183 return (NULL); 184 } 185 186 static void 187 msdosfs_hashins(struct denode *dep) 188 { 189 struct ihashhead *depp; 190 int val; 191 192 KASSERT(mutex_owned(&msdosfs_hashlock)); 193 194 mutex_enter(&msdosfs_ihash_lock); 195 val = DEHASH(dep->de_dev, dep->de_dirclust, dep->de_diroffset); 196 depp = &dehashtbl[val]; 197 LIST_INSERT_HEAD(depp, dep, de_hash); 198 mutex_exit(&msdosfs_ihash_lock); 199 } 200 201 static void 202 msdosfs_hashrem(struct denode *dep) 203 { 204 mutex_enter(&msdosfs_ihash_lock); 205 LIST_REMOVE(dep, de_hash); 206 mutex_exit(&msdosfs_ihash_lock); 207 } 208 209 /* 210 * If deget() succeeds it returns with the gotten denode locked(). 211 * 212 * pmp - address of msdosfsmount structure of the filesystem containing 213 * the denode of interest. The pm_dev field and the address of 214 * the msdosfsmount structure are used. 215 * dirclust - which cluster bp contains, if dirclust is 0 (root directory) 216 * diroffset is relative to the beginning of the root directory, 217 * otherwise it is cluster relative. 218 * diroffset - offset past begin of cluster of denode we want 219 * depp - returns the address of the gotten denode. 220 */ 221 int 222 deget(struct msdosfsmount *pmp, u_long dirclust, u_long diroffset, struct denode **depp) 223 /* pmp: so we know the maj/min number */ 224 /* dirclust: cluster this dir entry came from */ 225 /* diroffset: index of entry within the cluster */ 226 /* depp: returns the addr of the gotten denode */ 227 { 228 int error; 229 extern int (**msdosfs_vnodeop_p)(void *); 230 struct direntry *direntptr; 231 struct denode *ldep; 232 struct vnode *nvp; 233 struct buf *bp; 234 235 #ifdef MSDOSFS_DEBUG 236 printf("deget(pmp %p, dirclust %lu, diroffset %lx, depp %p)\n", 237 pmp, dirclust, diroffset, depp); 238 #endif 239 240 /* 241 * On FAT32 filesystems, root is a (more or less) normal 242 * directory 243 */ 244 if (FAT32(pmp) && dirclust == MSDOSFSROOT) 245 dirclust = pmp->pm_rootdirblk; 246 247 /* 248 * See if the denode is in the denode cache. Use the location of 249 * the directory entry to compute the hash value. For subdir use 250 * address of "." entry. For root dir (if not FAT32) use cluster 251 * MSDOSFSROOT, offset MSDOSFSROOT_OFS 252 * 253 * NOTE: The check for de_refcnt > 0 below insures the denode being 254 * examined does not represent an unlinked but still open file. 255 * These files are not to be accessible even when the directory 256 * entry that represented the file happens to be reused while the 257 * deleted file is still open. 258 */ 259 retry: 260 ldep = msdosfs_hashget(pmp->pm_dev, dirclust, diroffset, LK_EXCLUSIVE); 261 if (ldep) { 262 *depp = ldep; 263 return (0); 264 } 265 266 /* 267 * Directory entry was not in cache, have to create a vnode and 268 * copy it from the passed disk buffer. 269 */ 270 /* getnewvnode() does a VREF() on the vnode */ 271 error = getnewvnode(VT_MSDOSFS, pmp->pm_mountp, 272 msdosfs_vnodeop_p, &nvp); 273 if (error) { 274 *depp = 0; 275 return (error); 276 } 277 ldep = pool_get(&msdosfs_denode_pool, PR_WAITOK); 278 279 /* 280 * If someone beat us to it, put back the freshly allocated 281 * vnode/inode pair and retry. 282 */ 283 mutex_enter(&msdosfs_hashlock); 284 if (msdosfs_hashget(pmp->pm_dev, dirclust, diroffset, 0)) { 285 mutex_exit(&msdosfs_hashlock); 286 ungetnewvnode(nvp); 287 pool_put(&msdosfs_denode_pool, ldep); 288 goto retry; 289 } 290 memset(ldep, 0, sizeof *ldep); 291 nvp->v_data = ldep; 292 ldep->de_vnode = nvp; 293 ldep->de_flag = 0; 294 ldep->de_devvp = 0; 295 ldep->de_lockf = 0; 296 ldep->de_dev = pmp->pm_dev; 297 ldep->de_dirclust = dirclust; 298 ldep->de_diroffset = diroffset; 299 fc_purge(ldep, 0); /* init the fat cache for this denode */ 300 301 /* 302 * Insert the denode into the hash queue and lock the denode so it 303 * can't be accessed until we've read it in and have done what we 304 * need to it. 305 */ 306 vn_lock(nvp, LK_EXCLUSIVE | LK_RETRY); 307 genfs_node_init(nvp, &msdosfs_genfsops); 308 msdosfs_hashins(ldep); 309 mutex_exit(&msdosfs_hashlock); 310 311 ldep->de_pmp = pmp; 312 ldep->de_devvp = pmp->pm_devvp; 313 ldep->de_refcnt = 1; 314 /* 315 * Copy the directory entry into the denode area of the vnode. 316 */ 317 if ((dirclust == MSDOSFSROOT 318 || (FAT32(pmp) && dirclust == pmp->pm_rootdirblk)) 319 && diroffset == MSDOSFSROOT_OFS) { 320 /* 321 * Directory entry for the root directory. There isn't one, 322 * so we manufacture one. We should probably rummage 323 * through the root directory and find a label entry (if it 324 * exists), and then use the time and date from that entry 325 * as the time and date for the root denode. 326 */ 327 nvp->v_vflag |= VV_ROOT; /* should be further down XXX */ 328 329 ldep->de_Attributes = ATTR_DIRECTORY; 330 if (FAT32(pmp)) 331 ldep->de_StartCluster = pmp->pm_rootdirblk; 332 /* de_FileSize will be filled in further down */ 333 else { 334 ldep->de_StartCluster = MSDOSFSROOT; 335 ldep->de_FileSize = pmp->pm_rootdirsize * pmp->pm_BytesPerSec; 336 } 337 /* 338 * fill in time and date so that dos2unixtime() doesn't 339 * spit up when called from msdosfs_getattr() with root 340 * denode 341 */ 342 ldep->de_CHun = 0; 343 ldep->de_CTime = 0x0000; /* 00:00:00 */ 344 ldep->de_CDate = (0 << DD_YEAR_SHIFT) | (1 << DD_MONTH_SHIFT) 345 | (1 << DD_DAY_SHIFT); 346 /* Jan 1, 1980 */ 347 ldep->de_ADate = ldep->de_CDate; 348 ldep->de_MTime = ldep->de_CTime; 349 ldep->de_MDate = ldep->de_CDate; 350 /* leave the other fields as garbage */ 351 } else { 352 error = readep(pmp, dirclust, diroffset, &bp, &direntptr); 353 if (error) { 354 ldep->de_devvp = NULL; 355 ldep->de_Name[0] = SLOT_DELETED; 356 vput(nvp); 357 return (error); 358 } 359 DE_INTERNALIZE(ldep, direntptr); 360 brelse(bp, 0); 361 } 362 363 /* 364 * Fill in a few fields of the vnode and finish filling in the 365 * denode. Then return the address of the found denode. 366 */ 367 if (ldep->de_Attributes & ATTR_DIRECTORY) { 368 /* 369 * Since DOS directory entries that describe directories 370 * have 0 in the filesize field, we take this opportunity 371 * to find out the length of the directory and plug it into 372 * the denode structure. 373 */ 374 u_long size; 375 376 nvp->v_type = VDIR; 377 if (ldep->de_StartCluster != MSDOSFSROOT) { 378 error = pcbmap(ldep, CLUST_END, 0, &size, 0); 379 if (error == E2BIG) { 380 ldep->de_FileSize = de_cn2off(pmp, size); 381 error = 0; 382 } else 383 printf("deget(): pcbmap returned %d\n", error); 384 } 385 } else 386 nvp->v_type = VREG; 387 vref(ldep->de_devvp); 388 *depp = ldep; 389 uvm_vnp_setsize(nvp, ldep->de_FileSize); 390 return (0); 391 } 392 393 int 394 deupdat(struct denode *dep, int waitfor) 395 { 396 397 return (msdosfs_update(DETOV(dep), NULL, NULL, 398 waitfor ? UPDATE_WAIT : 0)); 399 } 400 401 /* 402 * Truncate the file described by dep to the length specified by length. 403 */ 404 int 405 detrunc(struct denode *dep, u_long length, int flags, kauth_cred_t cred) 406 { 407 int error; 408 int allerror; 409 u_long eofentry; 410 u_long chaintofree = 0; 411 daddr_t bn, lastblock; 412 int boff; 413 int isadir = dep->de_Attributes & ATTR_DIRECTORY; 414 struct buf *bp; 415 struct msdosfsmount *pmp = dep->de_pmp; 416 417 #ifdef MSDOSFS_DEBUG 418 printf("detrunc(): file %s, length %lu, flags %x\n", dep->de_Name, length, flags); 419 #endif 420 421 /* 422 * Disallow attempts to truncate the root directory since it is of 423 * fixed size. That's just the way dos filesystems are. We use 424 * the VROOT bit in the vnode because checking for the directory 425 * bit and a startcluster of 0 in the denode is not adequate to 426 * recognize the root directory at this point in a file or 427 * directory's life. 428 */ 429 if ((DETOV(dep)->v_vflag & VV_ROOT) && !FAT32(pmp)) { 430 printf("detrunc(): can't truncate root directory, clust %ld, offset %ld\n", 431 dep->de_dirclust, dep->de_diroffset); 432 return (EINVAL); 433 } 434 435 uvm_vnp_setsize(DETOV(dep), length); 436 437 if (dep->de_FileSize < length) 438 return (deextend(dep, length, cred)); 439 lastblock = de_clcount(pmp, length) - 1; 440 441 /* 442 * If the desired length is 0 then remember the starting cluster of 443 * the file and set the StartCluster field in the directory entry 444 * to 0. If the desired length is not zero, then get the number of 445 * the last cluster in the shortened file. Then get the number of 446 * the first cluster in the part of the file that is to be freed. 447 * Then set the next cluster pointer in the last cluster of the 448 * file to CLUST_EOFE. 449 */ 450 if (length == 0) { 451 chaintofree = dep->de_StartCluster; 452 dep->de_StartCluster = 0; 453 eofentry = ~0; 454 } else { 455 error = pcbmap(dep, lastblock, 0, &eofentry, 0); 456 if (error) { 457 #ifdef MSDOSFS_DEBUG 458 printf("detrunc(): pcbmap fails %d\n", error); 459 #endif 460 return (error); 461 } 462 } 463 464 fc_purge(dep, lastblock + 1); 465 466 /* 467 * If the new length is not a multiple of the cluster size then we 468 * must zero the tail end of the new last cluster in case it 469 * becomes part of the file again because of a seek. 470 */ 471 if ((boff = length & pmp->pm_crbomask) != 0) { 472 if (isadir) { 473 bn = cntobn(pmp, eofentry); 474 error = bread(pmp->pm_devvp, de_bn2kb(pmp, bn), 475 pmp->pm_bpcluster, NOCRED, B_MODIFY, &bp); 476 if (error) { 477 brelse(bp, 0); 478 #ifdef MSDOSFS_DEBUG 479 printf("detrunc(): bread fails %d\n", error); 480 #endif 481 return (error); 482 } 483 memset((char *)bp->b_data + boff, 0, 484 pmp->pm_bpcluster - boff); 485 if (flags & IO_SYNC) 486 bwrite(bp); 487 else 488 bdwrite(bp); 489 } else { 490 uvm_vnp_zerorange(DETOV(dep), length, 491 pmp->pm_bpcluster - boff); 492 } 493 } 494 495 /* 496 * Write out the updated directory entry. Even if the update fails 497 * we free the trailing clusters. 498 */ 499 dep->de_FileSize = length; 500 if (!isadir) 501 dep->de_flag |= DE_UPDATE|DE_MODIFIED; 502 vtruncbuf(DETOV(dep), lastblock + 1, 0, 0); 503 allerror = deupdat(dep, 1); 504 #ifdef MSDOSFS_DEBUG 505 printf("detrunc(): allerror %d, eofentry %lu\n", 506 allerror, eofentry); 507 #endif 508 509 /* 510 * If we need to break the cluster chain for the file then do it 511 * now. 512 */ 513 if (eofentry != ~0) { 514 error = fatentry(FAT_GET_AND_SET, pmp, eofentry, 515 &chaintofree, CLUST_EOFE); 516 if (error) { 517 #ifdef MSDOSFS_DEBUG 518 printf("detrunc(): fatentry errors %d\n", error); 519 #endif 520 return (error); 521 } 522 fc_setcache(dep, FC_LASTFC, de_cluster(pmp, length - 1), 523 eofentry); 524 } 525 526 /* 527 * Now free the clusters removed from the file because of the 528 * truncation. 529 */ 530 if (chaintofree != 0 && !MSDOSFSEOF(chaintofree, pmp->pm_fatmask)) 531 freeclusterchain(pmp, chaintofree); 532 533 return (allerror); 534 } 535 536 /* 537 * Extend the file described by dep to length specified by length. 538 */ 539 int 540 deextend(struct denode *dep, u_long length, kauth_cred_t cred) 541 { 542 struct msdosfsmount *pmp = dep->de_pmp; 543 u_long count, osize; 544 int error; 545 546 /* 547 * The root of a DOS filesystem cannot be extended. 548 */ 549 if ((DETOV(dep)->v_vflag & VV_ROOT) && !FAT32(pmp)) 550 return (EINVAL); 551 552 /* 553 * Directories cannot be extended. 554 */ 555 if (dep->de_Attributes & ATTR_DIRECTORY) 556 return (EISDIR); 557 558 if (length <= dep->de_FileSize) 559 panic("deextend: file too large"); 560 561 /* 562 * Compute the number of clusters to allocate. 563 */ 564 count = de_clcount(pmp, length) - de_clcount(pmp, dep->de_FileSize); 565 if (count > 0) { 566 if (count > pmp->pm_freeclustercount) 567 return (ENOSPC); 568 error = extendfile(dep, count, NULL, NULL, DE_CLEAR); 569 if (error) { 570 /* truncate the added clusters away again */ 571 (void) detrunc(dep, dep->de_FileSize, 0, cred); 572 return (error); 573 } 574 } 575 576 /* 577 * Zero extend file range; uvm_vnp_zerorange() uses ubc_alloc() and a 578 * memset(); we set the write size so ubc won't read in file data that 579 * is zero'd later. 580 */ 581 osize = dep->de_FileSize; 582 dep->de_FileSize = length; 583 uvm_vnp_setwritesize(DETOV(dep), (voff_t)dep->de_FileSize); 584 dep->de_flag |= DE_UPDATE|DE_MODIFIED; 585 uvm_vnp_zerorange(DETOV(dep), (off_t)osize, 586 (size_t)(dep->de_FileSize - osize)); 587 uvm_vnp_setsize(DETOV(dep), (voff_t)dep->de_FileSize); 588 return (deupdat(dep, 1)); 589 } 590 591 /* 592 * Move a denode to its correct hash queue after the file it represents has 593 * been moved to a new directory. 594 */ 595 void 596 reinsert(struct denode *dep) 597 { 598 /* 599 * Fix up the denode cache. If the denode is for a directory, 600 * there is nothing to do since the hash is based on the starting 601 * cluster of the directory file and that hasn't changed. If for a 602 * file the hash is based on the location of the directory entry, 603 * so we must remove it from the cache and re-enter it with the 604 * hash based on the new location of the directory entry. 605 */ 606 if (dep->de_Attributes & ATTR_DIRECTORY) 607 return; 608 mutex_enter(&msdosfs_hashlock); 609 msdosfs_hashrem(dep); 610 msdosfs_hashins(dep); 611 mutex_exit(&msdosfs_hashlock); 612 } 613 614 int 615 msdosfs_reclaim(void *v) 616 { 617 struct vop_reclaim_args /* { 618 struct vnode *a_vp; 619 } */ *ap = v; 620 struct vnode *vp = ap->a_vp; 621 struct denode *dep = VTODE(vp); 622 623 #ifdef MSDOSFS_DEBUG 624 printf("msdosfs_reclaim(): dep %p, file %s, refcnt %ld\n", 625 dep, dep->de_Name, dep->de_refcnt); 626 #endif 627 628 if (prtactive && vp->v_usecount > 1) 629 vprint("msdosfs_reclaim(): pushing active", vp); 630 /* 631 * Remove the denode from its hash chain. 632 */ 633 msdosfs_hashrem(dep); 634 /* 635 * Purge old data structures associated with the denode. 636 */ 637 cache_purge(vp); 638 if (dep->de_devvp) { 639 vrele(dep->de_devvp); 640 dep->de_devvp = 0; 641 } 642 #if 0 /* XXX */ 643 dep->de_flag = 0; 644 #endif 645 genfs_node_destroy(vp); 646 pool_put(&msdosfs_denode_pool, dep); 647 vp->v_data = NULL; 648 return (0); 649 } 650 651 int 652 msdosfs_inactive(void *v) 653 { 654 struct vop_inactive_args /* { 655 struct vnode *a_vp; 656 bool *a_recycle; 657 } */ *ap = v; 658 struct vnode *vp = ap->a_vp; 659 struct mount *mp = vp->v_mount; 660 struct denode *dep = VTODE(vp); 661 int error = 0; 662 663 #ifdef MSDOSFS_DEBUG 664 printf("msdosfs_inactive(): dep %p, de_Name[0] %x\n", dep, dep->de_Name[0]); 665 #endif 666 667 fstrans_start(mp, FSTRANS_LAZY); 668 /* 669 * Get rid of denodes related to stale file handles. 670 */ 671 if (dep->de_Name[0] == SLOT_DELETED) 672 goto out; 673 674 /* 675 * If the file has been deleted and it is on a read/write 676 * filesystem, then truncate the file, and mark the directory slot 677 * as empty. (This may not be necessary for the dos filesystem.) 678 */ 679 #ifdef MSDOSFS_DEBUG 680 printf("msdosfs_inactive(): dep %p, refcnt %ld, mntflag %x %s\n", 681 dep, dep->de_refcnt, vp->v_mount->mnt_flag, 682 (vp->v_mount->mnt_flag & MNT_RDONLY) ? "MNT_RDONLY" : ""); 683 #endif 684 if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 685 if (dep->de_FileSize != 0) { 686 error = detrunc(dep, (u_long)0, 0, NOCRED); 687 } 688 dep->de_Name[0] = SLOT_DELETED; 689 } 690 deupdat(dep, 0); 691 out: 692 /* 693 * If we are done with the denode, reclaim it 694 * so that it can be reused immediately. 695 */ 696 #ifdef MSDOSFS_DEBUG 697 printf("msdosfs_inactive(): v_usecount %d, de_Name[0] %x\n", 698 vp->v_usecount, dep->de_Name[0]); 699 #endif 700 *ap->a_recycle = (dep->de_Name[0] == SLOT_DELETED); 701 VOP_UNLOCK(vp); 702 fstrans_done(mp); 703 return (error); 704 } 705 706 int 707 msdosfs_gop_alloc(struct vnode *vp, off_t off, 708 off_t len, int flags, kauth_cred_t cred) 709 { 710 return 0; 711 } 712 713 void 714 msdosfs_gop_markupdate(struct vnode *vp, int flags) 715 { 716 u_long mask = 0; 717 718 if ((flags & GOP_UPDATE_ACCESSED) != 0) { 719 mask = DE_ACCESS; 720 } 721 if ((flags & GOP_UPDATE_MODIFIED) != 0) { 722 mask |= DE_UPDATE; 723 } 724 if (mask) { 725 struct denode *dep = VTODE(vp); 726 727 dep->de_flag |= mask; 728 } 729 } 730