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sys/fs/msdosfs/msdosfs_denode.c
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1 /* $NetBSD: msdosfs_denode.c,v 1.5 2004/03/27 04:43:43 atatat 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 1.5 2004/03/27 04:43:43 atatat 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 65 #include <uvm/uvm_extern.h> 66 67 #include <fs/msdosfs/bpb.h> 68 #include <fs/msdosfs/msdosfsmount.h> 69 #include <fs/msdosfs/direntry.h> 70 #include <fs/msdosfs/denode.h> 71 #include <fs/msdosfs/fat.h> 72 73 LIST_HEAD(ihashhead, denode) *dehashtbl; 74 u_long dehash; /* size of hash table - 1 */ 75 #define DEHASH(dev, dcl, doff) \ 76 (((dev) + (dcl) + (doff) / sizeof(struct direntry)) & dehash) 77 78 struct simplelock msdosfs_ihash_slock; 79 80 struct pool msdosfs_denode_pool; 81 82 extern int prtactive; 83 84 struct genfs_ops msdosfs_genfsops = { 85 genfs_size, 86 msdosfs_gop_alloc, 87 genfs_gop_write, 88 }; 89 90 static struct denode *msdosfs_hashget __P((dev_t, u_long, u_long)); 91 static void msdosfs_hashins __P((struct denode *)); 92 static void msdosfs_hashrem __P((struct denode *)); 93 94 #ifdef _LKM 95 MALLOC_DECLARE(M_MSDOSFSFAT); 96 #endif 97 98 void 99 msdosfs_init() 100 { 101 #ifdef _LKM 102 malloc_type_attach(M_MSDOSFSMNT); 103 malloc_type_attach(M_MSDOSFSFAT); 104 #endif 105 dehashtbl = hashinit(desiredvnodes / 2, HASH_LIST, M_MSDOSFSMNT, 106 M_WAITOK, &dehash); 107 simple_lock_init(&msdosfs_ihash_slock); 108 pool_init(&msdosfs_denode_pool, sizeof(struct denode), 0, 0, 0, 109 "msdosnopl", &pool_allocator_nointr); 110 } 111 112 /* 113 * Reinitialize inode hash table. 114 */ 115 116 void 117 msdosfs_reinit() 118 { 119 struct denode *dep; 120 struct ihashhead *oldhash, *hash; 121 u_long oldmask, mask, val; 122 int i; 123 124 hash = hashinit(desiredvnodes / 2, HASH_LIST, M_MSDOSFSMNT, M_WAITOK, 125 &mask); 126 127 simple_lock(&msdosfs_ihash_slock); 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 simple_unlock(&msdosfs_ihash_slock); 141 hashdone(oldhash, M_MSDOSFSMNT); 142 } 143 144 void 145 msdosfs_done() 146 { 147 hashdone(dehashtbl, M_MSDOSFSMNT); 148 pool_destroy(&msdosfs_denode_pool); 149 #ifdef _LKM 150 malloc_type_detach(M_MSDOSFSFAT); 151 malloc_type_detach(M_MSDOSFSMNT); 152 #endif 153 } 154 155 static struct denode * 156 msdosfs_hashget(dev, dirclust, diroff) 157 dev_t dev; 158 u_long dirclust; 159 u_long diroff; 160 { 161 struct denode *dep; 162 struct vnode *vp; 163 164 loop: 165 simple_lock(&msdosfs_ihash_slock); 166 LIST_FOREACH(dep, &dehashtbl[DEHASH(dev, dirclust, diroff)], de_hash) { 167 if (dirclust == dep->de_dirclust && 168 diroff == dep->de_diroffset && 169 dev == dep->de_dev && 170 dep->de_refcnt != 0) { 171 vp = DETOV(dep); 172 simple_lock(&vp->v_interlock); 173 simple_unlock(&msdosfs_ihash_slock); 174 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK)) 175 goto loop; 176 return (dep); 177 } 178 } 179 simple_unlock(&msdosfs_ihash_slock); 180 return (NULL); 181 } 182 183 static void 184 msdosfs_hashins(dep) 185 struct denode *dep; 186 { 187 struct ihashhead *depp; 188 int val; 189 190 simple_lock(&msdosfs_ihash_slock); 191 val = DEHASH(dep->de_dev, dep->de_dirclust, dep->de_diroffset); 192 depp = &dehashtbl[val]; 193 LIST_INSERT_HEAD(depp, dep, de_hash); 194 simple_unlock(&msdosfs_ihash_slock); 195 } 196 197 static void 198 msdosfs_hashrem(dep) 199 struct denode *dep; 200 { 201 simple_lock(&msdosfs_ihash_slock); 202 LIST_REMOVE(dep, de_hash); 203 simple_unlock(&msdosfs_ihash_slock); 204 } 205 206 /* 207 * If deget() succeeds it returns with the gotten denode locked(). 208 * 209 * pmp - address of msdosfsmount structure of the filesystem containing 210 * the denode of interest. The pm_dev field and the address of 211 * the msdosfsmount structure are used. 212 * dirclust - which cluster bp contains, if dirclust is 0 (root directory) 213 * diroffset is relative to the beginning of the root directory, 214 * otherwise it is cluster relative. 215 * diroffset - offset past begin of cluster of denode we want 216 * depp - returns the address of the gotten denode. 217 */ 218 int 219 deget(pmp, dirclust, diroffset, depp) 220 struct msdosfsmount *pmp; /* so we know the maj/min number */ 221 u_long dirclust; /* cluster this dir entry came from */ 222 u_long diroffset; /* index of entry within the cluster */ 223 struct denode **depp; /* returns the addr of the gotten denode */ 224 { 225 int error; 226 extern int (**msdosfs_vnodeop_p) __P((void *)); 227 struct direntry *direntptr; 228 struct denode *ldep; 229 struct vnode *nvp; 230 struct buf *bp; 231 232 #ifdef MSDOSFS_DEBUG 233 printf("deget(pmp %p, dirclust %lu, diroffset %lx, depp %p)\n", 234 pmp, dirclust, diroffset, depp); 235 #endif 236 237 /* 238 * On FAT32 filesystems, root is a (more or less) normal 239 * directory 240 */ 241 if (FAT32(pmp) && dirclust == MSDOSFSROOT) 242 dirclust = pmp->pm_rootdirblk; 243 244 /* 245 * See if the denode is in the denode cache. Use the location of 246 * the directory entry to compute the hash value. For subdir use 247 * address of "." entry. For root dir (if not FAT32) use cluster 248 * MSDOSFSROOT, offset MSDOSFSROOT_OFS 249 * 250 * NOTE: The check for de_refcnt > 0 below insures the denode being 251 * examined does not represent an unlinked but still open file. 252 * These files are not to be accessible even when the directory 253 * entry that represented the file happens to be reused while the 254 * deleted file is still open. 255 */ 256 ldep = msdosfs_hashget(pmp->pm_dev, dirclust, diroffset); 257 if (ldep) { 258 *depp = ldep; 259 return (0); 260 } 261 262 /* 263 * Directory entry was not in cache, have to create a vnode and 264 * copy it from the passed disk buffer. 265 */ 266 /* getnewvnode() does a VREF() on the vnode */ 267 error = getnewvnode(VT_MSDOSFS, pmp->pm_mountp, 268 msdosfs_vnodeop_p, &nvp); 269 if (error) { 270 *depp = 0; 271 return (error); 272 } 273 ldep = pool_get(&msdosfs_denode_pool, PR_WAITOK); 274 memset(ldep, 0, sizeof *ldep); 275 nvp->v_data = ldep; 276 ldep->de_vnode = nvp; 277 ldep->de_flag = 0; 278 ldep->de_devvp = 0; 279 ldep->de_lockf = 0; 280 ldep->de_dev = pmp->pm_dev; 281 ldep->de_dirclust = dirclust; 282 ldep->de_diroffset = diroffset; 283 fc_purge(ldep, 0); /* init the fat cache for this denode */ 284 285 /* 286 * Insert the denode into the hash queue and lock the denode so it 287 * can't be accessed until we've read it in and have done what we 288 * need to it. 289 */ 290 vn_lock(nvp, LK_EXCLUSIVE | LK_RETRY); 291 msdosfs_hashins(ldep); 292 293 ldep->de_pmp = pmp; 294 ldep->de_devvp = pmp->pm_devvp; 295 ldep->de_refcnt = 1; 296 /* 297 * Copy the directory entry into the denode area of the vnode. 298 */ 299 if ((dirclust == MSDOSFSROOT 300 || (FAT32(pmp) && dirclust == pmp->pm_rootdirblk)) 301 && diroffset == MSDOSFSROOT_OFS) { 302 /* 303 * Directory entry for the root directory. There isn't one, 304 * so we manufacture one. We should probably rummage 305 * through the root directory and find a label entry (if it 306 * exists), and then use the time and date from that entry 307 * as the time and date for the root denode. 308 */ 309 nvp->v_flag |= VROOT; /* should be further down XXX */ 310 311 ldep->de_Attributes = ATTR_DIRECTORY; 312 if (FAT32(pmp)) 313 ldep->de_StartCluster = pmp->pm_rootdirblk; 314 /* de_FileSize will be filled in further down */ 315 else { 316 ldep->de_StartCluster = MSDOSFSROOT; 317 ldep->de_FileSize = pmp->pm_rootdirsize * pmp->pm_BytesPerSec; 318 } 319 /* 320 * fill in time and date so that dos2unixtime() doesn't 321 * spit up when called from msdosfs_getattr() with root 322 * denode 323 */ 324 ldep->de_CHun = 0; 325 ldep->de_CTime = 0x0000; /* 00:00:00 */ 326 ldep->de_CDate = (0 << DD_YEAR_SHIFT) | (1 << DD_MONTH_SHIFT) 327 | (1 << DD_DAY_SHIFT); 328 /* Jan 1, 1980 */ 329 ldep->de_ADate = ldep->de_CDate; 330 ldep->de_MTime = ldep->de_CTime; 331 ldep->de_MDate = ldep->de_CDate; 332 /* leave the other fields as garbage */ 333 } else { 334 error = readep(pmp, dirclust, diroffset, &bp, &direntptr); 335 if (error) 336 return (error); 337 DE_INTERNALIZE(ldep, direntptr); 338 brelse(bp); 339 } 340 341 /* 342 * Fill in a few fields of the vnode and finish filling in the 343 * denode. Then return the address of the found denode. 344 */ 345 if (ldep->de_Attributes & ATTR_DIRECTORY) { 346 /* 347 * Since DOS directory entries that describe directories 348 * have 0 in the filesize field, we take this opportunity 349 * to find out the length of the directory and plug it into 350 * the denode structure. 351 */ 352 u_long size; 353 354 nvp->v_type = VDIR; 355 if (ldep->de_StartCluster != MSDOSFSROOT) { 356 error = pcbmap(ldep, CLUST_END, 0, &size, 0); 357 if (error == E2BIG) { 358 ldep->de_FileSize = de_cn2off(pmp, size); 359 error = 0; 360 } else 361 printf("deget(): pcbmap returned %d\n", error); 362 } 363 } else 364 nvp->v_type = VREG; 365 genfs_node_init(nvp, &msdosfs_genfsops); 366 VREF(ldep->de_devvp); 367 *depp = ldep; 368 nvp->v_size = ldep->de_FileSize; 369 return (0); 370 } 371 372 int 373 deupdat(dep, waitfor) 374 struct denode *dep; 375 int waitfor; 376 { 377 378 return (VOP_UPDATE(DETOV(dep), NULL, NULL, waitfor ? UPDATE_WAIT : 0)); 379 } 380 381 /* 382 * Truncate the file described by dep to the length specified by length. 383 */ 384 int 385 detrunc(dep, length, flags, cred, p) 386 struct denode *dep; 387 u_long length; 388 int flags; 389 struct ucred *cred; 390 struct proc *p; 391 { 392 int error; 393 int allerror; 394 u_long eofentry; 395 u_long chaintofree; 396 daddr_t bn, lastblock; 397 int boff; 398 int isadir = dep->de_Attributes & ATTR_DIRECTORY; 399 struct buf *bp; 400 struct msdosfsmount *pmp = dep->de_pmp; 401 402 #ifdef MSDOSFS_DEBUG 403 printf("detrunc(): file %s, length %lu, flags %x\n", dep->de_Name, length, flags); 404 #endif 405 406 /* 407 * Disallow attempts to truncate the root directory since it is of 408 * fixed size. That's just the way dos filesystems are. We use 409 * the VROOT bit in the vnode because checking for the directory 410 * bit and a startcluster of 0 in the denode is not adequate to 411 * recognize the root directory at this point in a file or 412 * directory's life. 413 */ 414 if ((DETOV(dep)->v_flag & VROOT) && !FAT32(pmp)) { 415 printf("detrunc(): can't truncate root directory, clust %ld, offset %ld\n", 416 dep->de_dirclust, dep->de_diroffset); 417 return (EINVAL); 418 } 419 420 uvm_vnp_setsize(DETOV(dep), length); 421 422 if (dep->de_FileSize < length) 423 return (deextend(dep, length, cred)); 424 lastblock = de_clcount(pmp, length) - 1; 425 426 /* 427 * If the desired length is 0 then remember the starting cluster of 428 * the file and set the StartCluster field in the directory entry 429 * to 0. If the desired length is not zero, then get the number of 430 * the last cluster in the shortened file. Then get the number of 431 * the first cluster in the part of the file that is to be freed. 432 * Then set the next cluster pointer in the last cluster of the 433 * file to CLUST_EOFE. 434 */ 435 if (length == 0) { 436 chaintofree = dep->de_StartCluster; 437 dep->de_StartCluster = 0; 438 eofentry = ~0; 439 } else { 440 error = pcbmap(dep, lastblock, 0, &eofentry, 0); 441 if (error) { 442 #ifdef MSDOSFS_DEBUG 443 printf("detrunc(): pcbmap fails %d\n", error); 444 #endif 445 return (error); 446 } 447 } 448 449 fc_purge(dep, lastblock + 1); 450 451 /* 452 * If the new length is not a multiple of the cluster size then we 453 * must zero the tail end of the new last cluster in case it 454 * becomes part of the file again because of a seek. 455 */ 456 if ((boff = length & pmp->pm_crbomask) != 0) { 457 if (isadir) { 458 bn = cntobn(pmp, eofentry); 459 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, 460 NOCRED, &bp); 461 if (error) { 462 brelse(bp); 463 #ifdef MSDOSFS_DEBUG 464 printf("detrunc(): bread fails %d\n", error); 465 #endif 466 return (error); 467 } 468 memset(bp->b_data + boff, 0, pmp->pm_bpcluster - boff); 469 if (flags & IO_SYNC) 470 bwrite(bp); 471 else 472 bdwrite(bp); 473 } else { 474 uvm_vnp_zerorange(DETOV(dep), length, 475 pmp->pm_bpcluster - boff); 476 } 477 } 478 479 /* 480 * Write out the updated directory entry. Even if the update fails 481 * we free the trailing clusters. 482 */ 483 dep->de_FileSize = length; 484 if (!isadir) 485 dep->de_flag |= DE_UPDATE|DE_MODIFIED; 486 vtruncbuf(DETOV(dep), lastblock + 1, 0, 0); 487 allerror = deupdat(dep, 1); 488 #ifdef MSDOSFS_DEBUG 489 printf("detrunc(): allerror %d, eofentry %lu\n", 490 allerror, eofentry); 491 #endif 492 493 /* 494 * If we need to break the cluster chain for the file then do it 495 * now. 496 */ 497 if (eofentry != ~0) { 498 error = fatentry(FAT_GET_AND_SET, pmp, eofentry, 499 &chaintofree, CLUST_EOFE); 500 if (error) { 501 #ifdef MSDOSFS_DEBUG 502 printf("detrunc(): fatentry errors %d\n", error); 503 #endif 504 return (error); 505 } 506 fc_setcache(dep, FC_LASTFC, de_cluster(pmp, length - 1), 507 eofentry); 508 } 509 510 /* 511 * Now free the clusters removed from the file because of the 512 * truncation. 513 */ 514 if (chaintofree != 0 && !MSDOSFSEOF(chaintofree, pmp->pm_fatmask)) 515 freeclusterchain(pmp, chaintofree); 516 517 return (allerror); 518 } 519 520 /* 521 * Extend the file described by dep to length specified by length. 522 */ 523 int 524 deextend(dep, length, cred) 525 struct denode *dep; 526 u_long length; 527 struct ucred *cred; 528 { 529 struct msdosfsmount *pmp = dep->de_pmp; 530 u_long count, osize; 531 int error; 532 533 /* 534 * The root of a DOS filesystem cannot be extended. 535 */ 536 if ((DETOV(dep)->v_flag & VROOT) && !FAT32(pmp)) 537 return (EINVAL); 538 539 /* 540 * Directories cannot be extended. 541 */ 542 if (dep->de_Attributes & ATTR_DIRECTORY) 543 return (EISDIR); 544 545 if (length <= dep->de_FileSize) 546 panic("deextend: file too large"); 547 548 /* 549 * Compute the number of clusters to allocate. 550 */ 551 count = de_clcount(pmp, length) - de_clcount(pmp, dep->de_FileSize); 552 if (count > 0) { 553 if (count > pmp->pm_freeclustercount) 554 return (ENOSPC); 555 error = extendfile(dep, count, NULL, NULL, DE_CLEAR); 556 if (error) { 557 /* truncate the added clusters away again */ 558 (void) detrunc(dep, dep->de_FileSize, 0, cred, NULL); 559 return (error); 560 } 561 } 562 563 osize = dep->de_FileSize; 564 dep->de_FileSize = length; 565 uvm_vnp_setsize(DETOV(dep), (voff_t)dep->de_FileSize); 566 dep->de_flag |= DE_UPDATE|DE_MODIFIED; 567 uvm_vnp_zerorange(DETOV(dep), (off_t)osize, 568 (size_t)(dep->de_FileSize - osize)); 569 return (deupdat(dep, 1)); 570 } 571 572 /* 573 * Move a denode to its correct hash queue after the file it represents has 574 * been moved to a new directory. 575 */ 576 void 577 reinsert(dep) 578 struct denode *dep; 579 { 580 /* 581 * Fix up the denode cache. If the denode is for a directory, 582 * there is nothing to do since the hash is based on the starting 583 * cluster of the directory file and that hasn't changed. If for a 584 * file the hash is based on the location of the directory entry, 585 * so we must remove it from the cache and re-enter it with the 586 * hash based on the new location of the directory entry. 587 */ 588 if (dep->de_Attributes & ATTR_DIRECTORY) 589 return; 590 msdosfs_hashrem(dep); 591 msdosfs_hashins(dep); 592 } 593 594 int 595 msdosfs_reclaim(v) 596 void *v; 597 { 598 struct vop_reclaim_args /* { 599 struct vnode *a_vp; 600 } */ *ap = v; 601 struct vnode *vp = ap->a_vp; 602 struct denode *dep = VTODE(vp); 603 604 #ifdef MSDOSFS_DEBUG 605 printf("msdosfs_reclaim(): dep %p, file %s, refcnt %ld\n", 606 dep, dep->de_Name, dep->de_refcnt); 607 #endif 608 609 if (prtactive && vp->v_usecount != 0) 610 vprint("msdosfs_reclaim(): pushing active", vp); 611 /* 612 * Remove the denode from its hash chain. 613 */ 614 msdosfs_hashrem(dep); 615 /* 616 * Purge old data structures associated with the denode. 617 */ 618 cache_purge(vp); 619 if (dep->de_devvp) { 620 vrele(dep->de_devvp); 621 dep->de_devvp = 0; 622 } 623 #if 0 /* XXX */ 624 dep->de_flag = 0; 625 #endif 626 pool_put(&msdosfs_denode_pool, dep); 627 vp->v_data = NULL; 628 return (0); 629 } 630 631 int 632 msdosfs_inactive(v) 633 void *v; 634 { 635 struct vop_inactive_args /* { 636 struct vnode *a_vp; 637 struct proc *a_p; 638 } */ *ap = v; 639 struct proc *p = ap->a_p; 640 struct vnode *vp = ap->a_vp; 641 struct denode *dep = VTODE(vp); 642 int error = 0; 643 644 #ifdef MSDOSFS_DEBUG 645 printf("msdosfs_inactive(): dep %p, de_Name[0] %x\n", dep, dep->de_Name[0]); 646 #endif 647 648 if (prtactive && vp->v_usecount != 0) 649 vprint("msdosfs_inactive(): pushing active", vp); 650 651 /* 652 * Get rid of denodes related to stale file handles. 653 */ 654 if (dep->de_Name[0] == SLOT_DELETED) 655 goto out; 656 657 /* 658 * If the file has been deleted and it is on a read/write 659 * filesystem, then truncate the file, and mark the directory slot 660 * as empty. (This may not be necessary for the dos filesystem.) 661 */ 662 #ifdef MSDOSFS_DEBUG 663 printf("msdosfs_inactive(): dep %p, refcnt %ld, mntflag %x %s\n", 664 dep, dep->de_refcnt, vp->v_mount->mnt_flag, 665 (vp->v_mount->mnt_flag & MNT_RDONLY) ? "MNT_RDONLY" : ""); 666 #endif 667 if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 668 if (dep->de_FileSize != 0) { 669 error = detrunc(dep, (u_long)0, 0, NOCRED, NULL); 670 } 671 dep->de_Name[0] = SLOT_DELETED; 672 } 673 deupdat(dep, 0); 674 out: 675 VOP_UNLOCK(vp, 0); 676 /* 677 * If we are done with the denode, reclaim it 678 * so that it can be reused immediately. 679 */ 680 #ifdef MSDOSFS_DEBUG 681 printf("msdosfs_inactive(): v_usecount %d, de_Name[0] %x\n", 682 vp->v_usecount, dep->de_Name[0]); 683 #endif 684 if (dep->de_Name[0] == SLOT_DELETED) 685 vrecycle(vp, (struct simplelock *)0, p); 686 return (error); 687 } 688 689 int 690 msdosfs_gop_alloc(struct vnode *vp, off_t off, off_t len, int flags, 691 struct ucred *cred) 692 { 693 return 0; 694 }
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