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sys/msdosfs/msdosfs_denode.c
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1 /* $FreeBSD$ */ 2 /* $NetBSD: msdosfs_denode.c,v 1.28 1998/02/10 14:10:00 mrg Exp $ */ 3 4 /*- 5 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. 6 * Copyright (C) 1994, 1995, 1997 TooLs GmbH. 7 * All rights reserved. 8 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by TooLs GmbH. 21 * 4. The name of TooLs GmbH may not be used to endorse or promote products 22 * derived from this software without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 27 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 29 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 30 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 31 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 32 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 33 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 /* 36 * Written by Paul Popelka (paulp@uts.amdahl.com) 37 * 38 * You can do anything you want with this software, just don't say you wrote 39 * it, and don't remove this notice. 40 * 41 * This software is provided "as is". 42 * 43 * The author supplies this software to be publicly redistributed on the 44 * understanding that the author is not responsible for the correct 45 * functioning of this software in any circumstances and is not liable for 46 * any damages caused by this software. 47 * 48 * October 1992 49 */ 50 51 #include <sys/param.h> 52 #include <sys/systm.h> 53 #include <sys/kernel.h> 54 #include <sys/mount.h> 55 #include <sys/malloc.h> 56 #include <sys/proc.h> 57 #include <sys/buf.h> 58 #include <sys/vnode.h> 59 60 #include <vm/vm.h> 61 #include <vm/vm_extern.h> 62 63 #include <msdosfs/bpb.h> 64 #include <msdosfs/msdosfsmount.h> 65 #include <msdosfs/direntry.h> 66 #include <msdosfs/denode.h> 67 #include <msdosfs/fat.h> 68 69 static MALLOC_DEFINE(M_MSDOSFSNODE, "MSDOSFS node", "MSDOSFS vnode private part"); 70 71 static struct denode **dehashtbl; 72 static u_long dehash; /* size of hash table - 1 */ 73 #define DEHASH(dev, dcl, doff) (dehashtbl[(minor(dev) + (dcl) + (doff) / \ 74 sizeof(struct direntry)) & dehash]) 75 #ifndef NULL_SIMPLELOCKS 76 static struct simplelock dehash_slock; 77 #endif 78 79 union _qcvt { 80 quad_t qcvt; 81 long val[2]; 82 }; 83 #define SETHIGH(q, h) { \ 84 union _qcvt tmp; \ 85 tmp.qcvt = (q); \ 86 tmp.val[_QUAD_HIGHWORD] = (h); \ 87 (q) = tmp.qcvt; \ 88 } 89 #define SETLOW(q, l) { \ 90 union _qcvt tmp; \ 91 tmp.qcvt = (q); \ 92 tmp.val[_QUAD_LOWWORD] = (l); \ 93 (q) = tmp.qcvt; \ 94 } 95 96 static struct denode * 97 msdosfs_hashget __P((dev_t dev, u_long dirclust, 98 u_long diroff)); 99 static void msdosfs_hashins __P((struct denode *dep)); 100 static void msdosfs_hashrem __P((struct denode *dep)); 101 102 /*ARGSUSED*/ 103 int 104 msdosfs_init(vfsp) 105 struct vfsconf *vfsp; 106 { 107 dehashtbl = hashinit(desiredvnodes/2, M_MSDOSFSMNT, &dehash); 108 simple_lock_init(&dehash_slock); 109 return (0); 110 } 111 112 int 113 msdosfs_uninit(vfsp) 114 struct vfsconf *vfsp; 115 { 116 117 if (dehashtbl) 118 free(dehashtbl, M_MSDOSFSMNT); 119 return (0); 120 } 121 122 static struct denode * 123 msdosfs_hashget(dev, dirclust, diroff) 124 dev_t dev; 125 u_long dirclust; 126 u_long diroff; 127 { 128 struct proc *p = curproc; /* XXX */ 129 struct denode *dep; 130 struct vnode *vp; 131 132 loop: 133 simple_lock(&dehash_slock); 134 for (dep = DEHASH(dev, dirclust, diroff); dep; dep = dep->de_next) { 135 if (dirclust == dep->de_dirclust 136 && diroff == dep->de_diroffset 137 && dev == dep->de_dev 138 && dep->de_refcnt != 0) { 139 vp = DETOV(dep); 140 simple_lock(&vp->v_interlock); 141 simple_unlock(&dehash_slock); 142 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, p)) 143 goto loop; 144 return (dep); 145 } 146 } 147 simple_unlock(&dehash_slock); 148 return (NULL); 149 } 150 151 static void 152 msdosfs_hashins(dep) 153 struct denode *dep; 154 { 155 struct denode **depp, *deq; 156 157 simple_lock(&dehash_slock); 158 depp = &DEHASH(dep->de_dev, dep->de_dirclust, dep->de_diroffset); 159 deq = *depp; 160 if (deq) 161 deq->de_prev = &dep->de_next; 162 dep->de_next = deq; 163 dep->de_prev = depp; 164 *depp = dep; 165 simple_unlock(&dehash_slock); 166 } 167 168 static void 169 msdosfs_hashrem(dep) 170 struct denode *dep; 171 { 172 struct denode *deq; 173 174 simple_lock(&dehash_slock); 175 deq = dep->de_next; 176 if (deq) 177 deq->de_prev = dep->de_prev; 178 *dep->de_prev = deq; 179 #ifdef DIAGNOSTIC 180 dep->de_next = NULL; 181 dep->de_prev = NULL; 182 #endif 183 simple_unlock(&dehash_slock); 184 } 185 186 /* 187 * If deget() succeeds it returns with the gotten denode locked(). 188 * 189 * pmp - address of msdosfsmount structure of the filesystem containing 190 * the denode of interest. The pm_dev field and the address of 191 * the msdosfsmount structure are used. 192 * dirclust - which cluster bp contains, if dirclust is 0 (root directory) 193 * diroffset is relative to the beginning of the root directory, 194 * otherwise it is cluster relative. 195 * diroffset - offset past begin of cluster of denode we want 196 * depp - returns the address of the gotten denode. 197 */ 198 int 199 deget(pmp, dirclust, diroffset, depp) 200 struct msdosfsmount *pmp; /* so we know the maj/min number */ 201 u_long dirclust; /* cluster this dir entry came from */ 202 u_long diroffset; /* index of entry within the cluster */ 203 struct denode **depp; /* returns the addr of the gotten denode */ 204 { 205 int error; 206 dev_t dev = pmp->pm_dev; 207 struct mount *mntp = pmp->pm_mountp; 208 struct direntry *direntptr; 209 struct denode *ldep; 210 struct vnode *nvp; 211 struct buf *bp; 212 struct proc *p = curproc; /* XXX */ 213 struct timeval tv; 214 215 #ifdef MSDOSFS_DEBUG 216 printf("deget(pmp %p, dirclust %lu, diroffset %lx, depp %p)\n", 217 pmp, dirclust, diroffset, depp); 218 #endif 219 220 /* 221 * On FAT32 filesystems, root is a (more or less) normal 222 * directory 223 */ 224 if (FAT32(pmp) && dirclust == MSDOSFSROOT) 225 dirclust = pmp->pm_rootdirblk; 226 227 /* 228 * See if the denode is in the denode cache. Use the location of 229 * the directory entry to compute the hash value. For subdir use 230 * address of "." entry. For root dir (if not FAT32) use cluster 231 * MSDOSFSROOT, offset MSDOSFSROOT_OFS 232 * 233 * NOTE: The check for de_refcnt > 0 below insures the denode being 234 * examined does not represent an unlinked but still open file. 235 * These files are not to be accessible even when the directory 236 * entry that represented the file happens to be reused while the 237 * deleted file is still open. 238 */ 239 ldep = msdosfs_hashget(dev, dirclust, diroffset); 240 if (ldep) { 241 *depp = ldep; 242 return (0); 243 } 244 245 /* 246 * Do the MALLOC before the getnewvnode since doing so afterward 247 * might cause a bogus v_data pointer to get dereferenced 248 * elsewhere if MALLOC should block. 249 */ 250 MALLOC(ldep, struct denode *, sizeof(struct denode), M_MSDOSFSNODE, M_WAITOK); 251 252 /* 253 * Directory entry was not in cache, have to create a vnode and 254 * copy it from the passed disk buffer. 255 */ 256 /* getnewvnode() does a VREF() on the vnode */ 257 error = getnewvnode(VT_MSDOSFS, mntp, msdosfs_vnodeop_p, &nvp); 258 if (error) { 259 *depp = NULL; 260 FREE(ldep, M_MSDOSFSNODE); 261 return error; 262 } 263 bzero((caddr_t)ldep, sizeof *ldep); 264 lockinit(&ldep->de_lock, PINOD, "denode", VLKTIMEOUT, 0); 265 nvp->v_data = ldep; 266 ldep->de_vnode = nvp; 267 ldep->de_flag = 0; 268 ldep->de_devvp = 0; 269 ldep->de_dev = dev; 270 ldep->de_dirclust = dirclust; 271 ldep->de_diroffset = diroffset; 272 fc_purge(ldep, 0); /* init the fat cache for this denode */ 273 274 /* 275 * Lock the denode so that it can't be accessed until we've read 276 * it in and have done what we need to it. Do this here instead 277 * of at the start of msdosfs_hashins() so that reinsert() can 278 * call msdosfs_hashins() with a locked denode. 279 */ 280 if (lockmgr(&ldep->de_lock, LK_EXCLUSIVE, (struct simplelock *)0, p)) 281 panic("deget: unexpected lock failure"); 282 283 /* 284 * Insert the denode into the hash queue. 285 */ 286 msdosfs_hashins(ldep); 287 288 ldep->de_pmp = pmp; 289 ldep->de_refcnt = 1; 290 /* 291 * Copy the directory entry into the denode area of the vnode. 292 */ 293 if ((dirclust == MSDOSFSROOT 294 || (FAT32(pmp) && dirclust == pmp->pm_rootdirblk)) 295 && diroffset == MSDOSFSROOT_OFS) { 296 /* 297 * Directory entry for the root directory. There isn't one, 298 * so we manufacture one. We should probably rummage 299 * through the root directory and find a label entry (if it 300 * exists), and then use the time and date from that entry 301 * as the time and date for the root denode. 302 */ 303 nvp->v_flag |= VROOT; /* should be further down XXX */ 304 305 ldep->de_Attributes = ATTR_DIRECTORY; 306 ldep->de_LowerCase = 0; 307 if (FAT32(pmp)) 308 ldep->de_StartCluster = pmp->pm_rootdirblk; 309 /* de_FileSize will be filled in further down */ 310 else { 311 ldep->de_StartCluster = MSDOSFSROOT; 312 ldep->de_FileSize = pmp->pm_rootdirsize * DEV_BSIZE; 313 } 314 /* 315 * fill in time and date so that dos2unixtime() doesn't 316 * spit up when called from msdosfs_getattr() with root 317 * denode 318 */ 319 ldep->de_CHun = 0; 320 ldep->de_CTime = 0x0000; /* 00:00:00 */ 321 ldep->de_CDate = (0 << DD_YEAR_SHIFT) | (1 << DD_MONTH_SHIFT) 322 | (1 << DD_DAY_SHIFT); 323 /* Jan 1, 1980 */ 324 ldep->de_ADate = ldep->de_CDate; 325 ldep->de_MTime = ldep->de_CTime; 326 ldep->de_MDate = ldep->de_CDate; 327 /* leave the other fields as garbage */ 328 } else { 329 error = readep(pmp, dirclust, diroffset, &bp, &direntptr); 330 if (error) { 331 /* 332 * The denode does not contain anything useful, so 333 * it would be wrong to leave it on its hash chain. 334 * Arrange for vput() to just forget about it. 335 */ 336 ldep->de_Name[0] = SLOT_DELETED; 337 338 vput(nvp); 339 *depp = NULL; 340 return (error); 341 } 342 DE_INTERNALIZE(ldep, direntptr); 343 brelse(bp); 344 } 345 346 /* 347 * Fill in a few fields of the vnode and finish filling in the 348 * denode. Then return the address of the found denode. 349 */ 350 if (ldep->de_Attributes & ATTR_DIRECTORY) { 351 /* 352 * Since DOS directory entries that describe directories 353 * have 0 in the filesize field, we take this opportunity 354 * to find out the length of the directory and plug it into 355 * the denode structure. 356 */ 357 u_long size; 358 359 /* 360 * XXX Sometimes, these arrives that . entry have cluster 361 * number 0, when it shouldn't. Use real cluster number 362 * instead of what is written in directory entry. 363 */ 364 if ((diroffset == 0) && (ldep->de_StartCluster != dirclust)) { 365 printf("deget(): . entry at clust %ld != %ld\n", 366 dirclust, ldep->de_StartCluster); 367 ldep->de_StartCluster = dirclust; 368 } 369 370 nvp->v_type = VDIR; 371 if (ldep->de_StartCluster != MSDOSFSROOT) { 372 error = pcbmap(ldep, 0xffff, 0, &size, 0); 373 if (error == E2BIG) { 374 ldep->de_FileSize = de_cn2off(pmp, size); 375 error = 0; 376 } else 377 printf("deget(): pcbmap returned %d\n", error); 378 } 379 } else 380 nvp->v_type = VREG; 381 getmicrouptime(&tv); 382 SETHIGH(ldep->de_modrev, tv.tv_sec); 383 SETLOW(ldep->de_modrev, tv.tv_usec * 4294); 384 ldep->de_devvp = pmp->pm_devvp; 385 VREF(ldep->de_devvp); 386 *depp = ldep; 387 return (0); 388 } 389 390 int 391 deupdat(dep, waitfor) 392 struct denode *dep; 393 int waitfor; 394 { 395 int error; 396 struct buf *bp; 397 struct direntry *dirp; 398 struct timespec ts; 399 400 if (DETOV(dep)->v_mount->mnt_flag & MNT_RDONLY) 401 return (0); 402 getnanotime(&ts); 403 DETIMES(dep, &ts, &ts, &ts); 404 if ((dep->de_flag & DE_MODIFIED) == 0) 405 return (0); 406 dep->de_flag &= ~DE_MODIFIED; 407 if (dep->de_Attributes & ATTR_DIRECTORY) 408 return (0); 409 if (dep->de_refcnt <= 0) 410 return (0); 411 error = readde(dep, &bp, &dirp); 412 if (error) 413 return (error); 414 DE_EXTERNALIZE(dirp, dep); 415 if (waitfor) 416 return (bwrite(bp)); 417 else { 418 bdwrite(bp); 419 return (0); 420 } 421 } 422 423 /* 424 * Truncate the file described by dep to the length specified by length. 425 */ 426 int 427 detrunc(dep, length, flags, cred, p) 428 struct denode *dep; 429 u_long length; 430 int flags; 431 struct ucred *cred; 432 struct proc *p; 433 { 434 int error; 435 int allerror; 436 u_long eofentry; 437 u_long chaintofree; 438 daddr_t bn; 439 int boff; 440 int isadir = dep->de_Attributes & ATTR_DIRECTORY; 441 struct buf *bp; 442 struct msdosfsmount *pmp = dep->de_pmp; 443 444 #ifdef MSDOSFS_DEBUG 445 printf("detrunc(): file %s, length %lu, flags %x\n", dep->de_Name, length, flags); 446 #endif 447 448 /* 449 * Disallow attempts to truncate the root directory since it is of 450 * fixed size. That's just the way dos filesystems are. We use 451 * the VROOT bit in the vnode because checking for the directory 452 * bit and a startcluster of 0 in the denode is not adequate to 453 * recognize the root directory at this point in a file or 454 * directory's life. 455 */ 456 if ((DETOV(dep)->v_flag & VROOT) && !FAT32(pmp)) { 457 printf("detrunc(): can't truncate root directory, clust %ld, offset %ld\n", 458 dep->de_dirclust, dep->de_diroffset); 459 return (EINVAL); 460 } 461 462 463 if (dep->de_FileSize < length) { 464 vnode_pager_setsize(DETOV(dep), length); 465 return deextend(dep, length, cred); 466 } 467 468 /* 469 * If the desired length is 0 then remember the starting cluster of 470 * the file and set the StartCluster field in the directory entry 471 * to 0. If the desired length is not zero, then get the number of 472 * the last cluster in the shortened file. Then get the number of 473 * the first cluster in the part of the file that is to be freed. 474 * Then set the next cluster pointer in the last cluster of the 475 * file to CLUST_EOFE. 476 */ 477 if (length == 0) { 478 chaintofree = dep->de_StartCluster; 479 dep->de_StartCluster = 0; 480 eofentry = ~0; 481 } else { 482 error = pcbmap(dep, de_clcount(pmp, length) - 1, 0, 483 &eofentry, 0); 484 if (error) { 485 #ifdef MSDOSFS_DEBUG 486 printf("detrunc(): pcbmap fails %d\n", error); 487 #endif 488 return (error); 489 } 490 } 491 492 fc_purge(dep, de_clcount(pmp, length)); 493 494 /* 495 * If the new length is not a multiple of the cluster size then we 496 * must zero the tail end of the new last cluster in case it 497 * becomes part of the file again because of a seek. 498 */ 499 if ((boff = length & pmp->pm_crbomask) != 0) { 500 if (isadir) { 501 bn = cntobn(pmp, eofentry); 502 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, 503 NOCRED, &bp); 504 if (error) { 505 brelse(bp); 506 #ifdef MSDOSFS_DEBUG 507 printf("detrunc(): bread fails %d\n", error); 508 #endif 509 return (error); 510 } 511 bzero(bp->b_data + boff, pmp->pm_bpcluster - boff); 512 if (flags & IO_SYNC) 513 bwrite(bp); 514 else 515 bdwrite(bp); 516 } 517 } 518 519 /* 520 * Write out the updated directory entry. Even if the update fails 521 * we free the trailing clusters. 522 */ 523 dep->de_FileSize = length; 524 if (!isadir) 525 dep->de_flag |= DE_UPDATE|DE_MODIFIED; 526 allerror = vtruncbuf(DETOV(dep), cred, p, length, pmp->pm_bpcluster); 527 #ifdef MSDOSFS_DEBUG 528 if (allerror) 529 printf("detrunc(): vtruncbuf error %d\n", allerror); 530 #endif 531 error = deupdat(dep, 1); 532 if (error && (allerror == 0)) 533 allerror = error; 534 #ifdef MSDOSFS_DEBUG 535 printf("detrunc(): allerror %d, eofentry %lu\n", 536 allerror, eofentry); 537 #endif 538 539 /* 540 * If we need to break the cluster chain for the file then do it 541 * now. 542 */ 543 if (eofentry != ~0) { 544 error = fatentry(FAT_GET_AND_SET, pmp, eofentry, 545 &chaintofree, CLUST_EOFE); 546 if (error) { 547 #ifdef MSDOSFS_DEBUG 548 printf("detrunc(): fatentry errors %d\n", error); 549 #endif 550 return (error); 551 } 552 fc_setcache(dep, FC_LASTFC, de_cluster(pmp, length - 1), 553 eofentry); 554 } 555 556 /* 557 * Now free the clusters removed from the file because of the 558 * truncation. 559 */ 560 if (chaintofree != 0 && !MSDOSFSEOF(pmp, chaintofree)) 561 freeclusterchain(pmp, chaintofree); 562 563 return (allerror); 564 } 565 566 /* 567 * Extend the file described by dep to length specified by length. 568 */ 569 int 570 deextend(dep, length, cred) 571 struct denode *dep; 572 u_long length; 573 struct ucred *cred; 574 { 575 struct msdosfsmount *pmp = dep->de_pmp; 576 u_long count; 577 int error; 578 579 /* 580 * The root of a DOS filesystem cannot be extended. 581 */ 582 if ((DETOV(dep)->v_flag & VROOT) && !FAT32(pmp)) 583 return (EINVAL); 584 585 /* 586 * Directories cannot be extended. 587 */ 588 if (dep->de_Attributes & ATTR_DIRECTORY) 589 return (EISDIR); 590 591 if (length <= dep->de_FileSize) 592 panic("deextend: file too large"); 593 594 /* 595 * Compute the number of clusters to allocate. 596 */ 597 count = de_clcount(pmp, length) - de_clcount(pmp, dep->de_FileSize); 598 if (count > 0) { 599 if (count > pmp->pm_freeclustercount) 600 return (ENOSPC); 601 error = extendfile(dep, count, NULL, NULL, DE_CLEAR); 602 if (error) { 603 /* truncate the added clusters away again */ 604 (void) detrunc(dep, dep->de_FileSize, 0, cred, NULL); 605 return (error); 606 } 607 } 608 dep->de_FileSize = length; 609 dep->de_flag |= DE_UPDATE|DE_MODIFIED; 610 return (deupdat(dep, 1)); 611 } 612 613 /* 614 * Move a denode to its correct hash queue after the file it represents has 615 * been moved to a new directory. 616 */ 617 void 618 reinsert(dep) 619 struct denode *dep; 620 { 621 /* 622 * Fix up the denode cache. If the denode is for a directory, 623 * there is nothing to do since the hash is based on the starting 624 * cluster of the directory file and that hasn't changed. If for a 625 * file the hash is based on the location of the directory entry, 626 * so we must remove it from the cache and re-enter it with the 627 * hash based on the new location of the directory entry. 628 */ 629 if (dep->de_Attributes & ATTR_DIRECTORY) 630 return; 631 msdosfs_hashrem(dep); 632 msdosfs_hashins(dep); 633 } 634 635 int 636 msdosfs_reclaim(ap) 637 struct vop_reclaim_args /* { 638 struct vnode *a_vp; 639 } */ *ap; 640 { 641 struct vnode *vp = ap->a_vp; 642 struct denode *dep = VTODE(vp); 643 644 #ifdef MSDOSFS_DEBUG 645 printf("msdosfs_reclaim(): dep %p, file %s, refcnt %ld\n", 646 dep, dep->de_Name, dep->de_refcnt); 647 #endif 648 649 if (prtactive && vp->v_usecount != 0) 650 vprint("msdosfs_reclaim(): pushing active", vp); 651 /* 652 * Remove the denode from its hash chain. 653 */ 654 msdosfs_hashrem(dep); 655 /* 656 * Purge old data structures associated with the denode. 657 */ 658 cache_purge(vp); 659 if (dep->de_devvp) { 660 vrele(dep->de_devvp); 661 dep->de_devvp = 0; 662 } 663 #if 0 /* XXX */ 664 dep->de_flag = 0; 665 #endif 666 FREE(dep, M_MSDOSFSNODE); 667 vp->v_data = NULL; 668 669 return (0); 670 } 671 672 int 673 msdosfs_inactive(ap) 674 struct vop_inactive_args /* { 675 struct vnode *a_vp; 676 struct proc *a_p; 677 } */ *ap; 678 { 679 struct vnode *vp = ap->a_vp; 680 struct denode *dep = VTODE(vp); 681 struct proc *p = ap->a_p; 682 int error = 0; 683 684 #ifdef MSDOSFS_DEBUG 685 printf("msdosfs_inactive(): dep %p, de_Name[0] %x\n", dep, dep->de_Name[0]); 686 #endif 687 688 if (prtactive && vp->v_usecount != 0) 689 vprint("msdosfs_inactive(): pushing active", vp); 690 691 /* 692 * Ignore denodes related to stale file handles. 693 */ 694 if (dep->de_Name[0] == SLOT_DELETED) 695 goto out; 696 697 /* 698 * If the file has been deleted and it is on a read/write 699 * filesystem, then truncate the file, and mark the directory slot 700 * as empty. (This may not be necessary for the dos filesystem.) 701 */ 702 #ifdef MSDOSFS_DEBUG 703 printf("msdosfs_inactive(): dep %p, refcnt %ld, mntflag %x, MNT_RDONLY %x\n", 704 dep, dep->de_refcnt, vp->v_mount->mnt_flag, MNT_RDONLY); 705 #endif 706 if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 707 error = detrunc(dep, (u_long) 0, 0, NOCRED, p); 708 dep->de_flag |= DE_UPDATE; 709 dep->de_Name[0] = SLOT_DELETED; 710 } 711 deupdat(dep, 0); 712 713 out: 714 VOP_UNLOCK(vp, 0, p); 715 /* 716 * If we are done with the denode, reclaim it 717 * so that it can be reused immediately. 718 */ 719 #ifdef MSDOSFS_DEBUG 720 printf("msdosfs_inactive(): v_usecount %d, de_Name[0] %x\n", vp->v_usecount, 721 dep->de_Name[0]); 722 #endif 723 if (dep->de_Name[0] == SLOT_DELETED) 724 vrecycle(vp, (struct simplelock *)0, p); 725 return (error); 726 }
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