1 /* $FreeBSD: src/sys/msdosfs/msdosfs_denode.c,v 1.47.2.3 2002/08/22 16:20:15 trhodes Exp $ */ 2 /* $DragonFly: src/sys/vfs/msdosfs/msdosfs_denode.c,v 1.35 2008/06/08 07:56:06 nth Exp $ */ 3 /* $NetBSD: msdosfs_denode.c,v 1.28 1998/02/10 14:10:00 mrg Exp $ */ 4 5 /*- 6 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. 7 * Copyright (C) 1994, 1995, 1997 TooLs GmbH. 8 * All rights reserved. 9 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by TooLs GmbH. 22 * 4. The name of TooLs GmbH may not be used to endorse or promote products 23 * derived from this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 26 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 27 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 28 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 29 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 30 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 31 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 32 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 33 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 34 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 35 */ 36 /* 37 * Written by Paul Popelka (paulp@uts.amdahl.com) 38 * 39 * You can do anything you want with this software, just don't say you wrote 40 * it, and don't remove this notice. 41 * 42 * This software is provided "as is". 43 * 44 * The author supplies this software to be publicly redistributed on the 45 * understanding that the author is not responsible for the correct 46 * functioning of this software in any circumstances and is not liable for 47 * any damages caused by this software. 48 * 49 * October 1992 50 */ 51 52 #include <sys/param.h> 53 #include <sys/systm.h> 54 #include <sys/kernel.h> 55 #include <sys/mount.h> 56 #include <sys/malloc.h> 57 #include <sys/proc.h> 58 #include <sys/buf.h> 59 #include <sys/vnode.h> 60 61 #include <vm/vm.h> 62 #include <vm/vm_extern.h> 63 64 #include "bpb.h" 65 #include "msdosfsmount.h" 66 #include "direntry.h" 67 #include "denode.h" 68 #include "fat.h" 69 70 static int msdosfs_hashins (struct denode *dep); 71 static void msdosfs_hashrem (struct denode *dep); 72 73 static MALLOC_DEFINE(M_MSDOSFSNODE, "MSDOSFS node", "MSDOSFS vnode private part"); 74 75 static struct denode **dehashtbl; 76 static u_long dehash; /* size of hash table - 1 */ 77 #define DEHASH(dev, dcl, doff) (dehashtbl[(minor(dev) + (dcl) + (doff) / \ 78 sizeof(struct direntry)) & dehash]) 79 static struct lwkt_token dehash_token; 80 81 union _qcvt { 82 quad_t qcvt; 83 long val[2]; 84 }; 85 #define SETHIGH(q, h) { \ 86 union _qcvt tmp; \ 87 tmp.qcvt = (q); \ 88 tmp.val[_QUAD_HIGHWORD] = (h); \ 89 (q) = tmp.qcvt; \ 90 } 91 #define SETLOW(q, l) { \ 92 union _qcvt tmp; \ 93 tmp.qcvt = (q); \ 94 tmp.val[_QUAD_LOWWORD] = (l); \ 95 (q) = tmp.qcvt; \ 96 } 97 98 static struct denode * 99 msdosfs_hashget (cdev_t dev, u_long dirclust, u_long diroff); 100 101 /*ARGSUSED*/ 102 int 103 msdosfs_init(struct vfsconf *vfsp) 104 { 105 dehash = 16; 106 while (dehash < desiredvnodes) 107 dehash <<= 1; 108 dehashtbl = kmalloc(sizeof(void *) * dehash, M_MSDOSFSMNT, 109 M_WAITOK|M_ZERO); 110 --dehash; 111 lwkt_token_init(&dehash_token); 112 return (0); 113 } 114 115 int 116 msdosfs_uninit(struct vfsconf *vfsp) 117 { 118 119 if (dehashtbl) 120 kfree(dehashtbl, M_MSDOSFSMNT); 121 return (0); 122 } 123 124 static struct denode * 125 msdosfs_hashget(cdev_t dev, u_long dirclust, u_long diroff) 126 { 127 struct denode *dep; 128 lwkt_tokref ilock; 129 struct vnode *vp; 130 131 lwkt_gettoken(&ilock, &dehash_token); 132 loop: 133 for (dep = DEHASH(dev, dirclust, diroff); dep; dep = dep->de_next) { 134 if (dirclust != dep->de_dirclust 135 || diroff != dep->de_diroffset 136 || dev != dep->de_dev 137 || dep->de_refcnt == 0) { 138 continue; 139 } 140 vp = DETOV(dep); 141 if (vget(vp, LK_EXCLUSIVE)) 142 goto loop; 143 144 /* 145 * We must check to see if the inode has been ripped 146 * out from under us after blocking. 147 */ 148 for (dep = DEHASH(dev, dirclust, diroff); dep; dep = dep->de_next) { 149 if (dirclust == dep->de_dirclust 150 && diroff == dep->de_diroffset 151 && dev == dep->de_dev 152 && dep->de_refcnt != 0) { 153 break; 154 } 155 } 156 if (dep == NULL || DETOV(dep) != vp) { 157 vput(vp); 158 goto loop; 159 } 160 lwkt_reltoken(&ilock); 161 return (dep); 162 } 163 lwkt_reltoken(&ilock); 164 return (NULL); 165 } 166 167 static 168 int 169 msdosfs_hashins(struct denode *dep) 170 { 171 struct denode **depp, *deq; 172 lwkt_tokref ilock; 173 174 lwkt_gettoken(&ilock, &dehash_token); 175 depp = &DEHASH(dep->de_dev, dep->de_dirclust, dep->de_diroffset); 176 while ((deq = *depp) != NULL) { 177 if (deq->de_dev == dep->de_dev && 178 deq->de_dirclust == dep->de_dirclust && 179 deq->de_diroffset == dep->de_diroffset) { 180 lwkt_reltoken(&ilock); 181 if (dep->de_refcnt) 182 return(EBUSY); 183 else 184 return(EINVAL); 185 } 186 depp = &deq->de_next; 187 } 188 dep->de_next = NULL; 189 *depp = dep; 190 lwkt_reltoken(&ilock); 191 return(0); 192 } 193 194 static 195 void 196 msdosfs_hashrem(struct denode *dep) 197 { 198 struct denode **depp, *deq; 199 lwkt_tokref ilock; 200 201 lwkt_gettoken(&ilock, &dehash_token); 202 depp = &DEHASH(dep->de_dev, dep->de_dirclust, dep->de_diroffset); 203 while ((deq = *depp) != NULL) { 204 if (dep == deq) 205 break; 206 depp = &deq->de_next; 207 } 208 KKASSERT(dep == deq); 209 *depp = dep->de_next; 210 dep->de_next = NULL; 211 lwkt_reltoken(&ilock); 212 } 213 214 void 215 msdosfs_reinsert(struct denode *ip, u_long new_dirclust, u_long new_diroffset) 216 { 217 lwkt_tokref ilock; 218 int error; 219 220 lwkt_gettoken(&ilock, &dehash_token); 221 msdosfs_hashrem(ip); 222 ip->de_dirclust = new_dirclust; 223 ip->de_diroffset = new_diroffset; 224 error = msdosfs_hashins(ip); 225 KASSERT(!error, ("msdosfs_reinsert: insertion failed %d", error)); 226 lwkt_reltoken(&ilock); 227 } 228 229 /* 230 * If deget() succeeds it returns with the gotten denode locked(). 231 * 232 * pmp - address of msdosfsmount structure of the filesystem containing 233 * the denode of interest. The pm_dev field and the address of 234 * the msdosfsmount structure are used. 235 * dirclust - which cluster bp contains, if dirclust is 0 (root directory) 236 * diroffset is relative to the beginning of the root directory, 237 * otherwise it is cluster relative. 238 * diroffset - offset past begin of cluster of denode we want 239 * depp - returns the address of the gotten denode. 240 */ 241 int 242 deget(struct msdosfsmount *pmp, /* so we know the maj/min number */ 243 u_long dirclust, /* cluster this dir entry came from */ 244 u_long diroffset, /* index of entry within the cluster */ 245 struct denode **depp) /* returns the addr of the gotten denode */ 246 { 247 int error; 248 cdev_t dev = pmp->pm_dev; 249 struct mount *mntp = pmp->pm_mountp; 250 struct direntry *direntptr; 251 struct denode *ldep; 252 struct vnode *nvp; 253 struct buf *bp; 254 struct timeval tv; 255 256 #ifdef MSDOSFS_DEBUG 257 kprintf("deget(pmp %p, dirclust %lu, diroffset %lx, depp %p)\n", 258 pmp, dirclust, diroffset, depp); 259 #endif 260 261 /* 262 * On FAT32 filesystems, root is a (more or less) normal 263 * directory 264 */ 265 if (FAT32(pmp) && dirclust == MSDOSFSROOT) 266 dirclust = pmp->pm_rootdirblk; 267 268 again: 269 /* 270 * See if the denode is in the denode cache. Use the location of 271 * the directory entry to compute the hash value. For subdir use 272 * address of "." entry. For root dir (if not FAT32) use cluster 273 * MSDOSFSROOT, offset MSDOSFSROOT_OFS 274 * 275 * NOTE: The check for de_refcnt > 0 below insures the denode being 276 * examined does not represent an unlinked but still open file. 277 * These files are not to be accessible even when the directory 278 * entry that represented the file happens to be reused while the 279 * deleted file is still open. 280 */ 281 ldep = msdosfs_hashget(dev, dirclust, diroffset); 282 if (ldep) { 283 *depp = ldep; 284 return (0); 285 } 286 287 /* 288 * Do the MALLOC before the getnewvnode since doing so afterward 289 * might cause a bogus v_data pointer to get dereferenced 290 * elsewhere if MALLOC should block. 291 */ 292 MALLOC(ldep, struct denode *, sizeof(struct denode), M_MSDOSFSNODE, M_WAITOK); 293 294 /* 295 * Directory entry was not in cache, have to create a vnode and 296 * copy it from the passed disk buffer. 297 */ 298 299 /* getnewvnode() does a vref() on the vnode */ 300 error = getnewvnode(VT_MSDOSFS, mntp, &nvp, VLKTIMEOUT, 0); 301 if (error) { 302 *depp = NULL; 303 FREE(ldep, M_MSDOSFSNODE); 304 return error; 305 } 306 307 bzero((caddr_t)ldep, sizeof *ldep); 308 ldep->de_vnode = nvp; 309 ldep->de_flag = 0; 310 ldep->de_devvp = 0; 311 ldep->de_dev = dev; 312 ldep->de_dirclust = dirclust; 313 ldep->de_diroffset = diroffset; 314 fc_purge(ldep, 0); /* init the fat cache for this denode */ 315 316 /* 317 * Insert the denode into the hash queue. If a collision occurs 318 * throw away the vnode and try again. 319 */ 320 error = msdosfs_hashins(ldep); 321 if (error == EBUSY) { 322 nvp->v_type = VBAD; 323 vx_put(nvp); 324 kfree(ldep, M_MSDOSFSNODE); 325 goto again; 326 } else if (error) { 327 nvp->v_type = VBAD; 328 vx_put(nvp); 329 kfree(ldep, M_MSDOSFSNODE); 330 return (EINVAL); 331 } 332 nvp->v_data = ldep; 333 ldep->de_pmp = pmp; 334 ldep->de_refcnt = 1; 335 /* 336 * Copy the directory entry into the denode area of the vnode. 337 */ 338 if ((dirclust == MSDOSFSROOT 339 || (FAT32(pmp) && dirclust == pmp->pm_rootdirblk)) 340 && diroffset == MSDOSFSROOT_OFS) { 341 /* 342 * Directory entry for the root directory. There isn't one, 343 * so we manufacture one. We should probably rummage 344 * through the root directory and find a label entry (if it 345 * exists), and then use the time and date from that entry 346 * as the time and date for the root denode. 347 */ 348 nvp->v_flag |= VROOT; /* should be further down XXX */ 349 350 ldep->de_Attributes = ATTR_DIRECTORY; 351 ldep->de_LowerCase = 0; 352 if (FAT32(pmp)) 353 ldep->de_StartCluster = pmp->pm_rootdirblk; 354 /* de_FileSize will be filled in further down */ 355 else { 356 ldep->de_StartCluster = MSDOSFSROOT; 357 ldep->de_FileSize = pmp->pm_rootdirsize * DEV_BSIZE; 358 } 359 /* 360 * fill in time and date so that dos2unixtime() doesn't 361 * spit up when called from msdosfs_getattr() with root 362 * denode 363 */ 364 ldep->de_CHun = 0; 365 ldep->de_CTime = 0x0000; /* 00:00:00 */ 366 ldep->de_CDate = (0 << DD_YEAR_SHIFT) | (1 << DD_MONTH_SHIFT) 367 | (1 << DD_DAY_SHIFT); 368 /* Jan 1, 1980 */ 369 ldep->de_ADate = ldep->de_CDate; 370 ldep->de_MTime = ldep->de_CTime; 371 ldep->de_MDate = ldep->de_CDate; 372 /* leave the other fields as garbage */ 373 } else { 374 error = readep(pmp, dirclust, diroffset, &bp, &direntptr); 375 if (error) { 376 /* 377 * The denode does not contain anything useful, so 378 * it would be wrong to leave it on its hash chain. 379 * Arrange for vput() to just forget about it. 380 */ 381 ldep->de_Name[0] = SLOT_DELETED; 382 nvp->v_type = VBAD; 383 384 vx_put(nvp); 385 *depp = NULL; 386 return (error); 387 } 388 DE_INTERNALIZE(ldep, direntptr); 389 brelse(bp); 390 } 391 392 /* 393 * Fill in a few fields of the vnode and finish filling in the 394 * denode. Then return the address of the found denode. 395 */ 396 if (ldep->de_Attributes & ATTR_DIRECTORY) { 397 /* 398 * Since DOS directory entries that describe directories 399 * have 0 in the filesize field, we take this opportunity 400 * to find out the length of the directory and plug it into 401 * the denode structure. 402 */ 403 u_long size; 404 405 /* 406 * XXX Sometimes, these arrives that . entry have cluster 407 * number 0, when it shouldn't. Use real cluster number 408 * instead of what is written in directory entry. 409 */ 410 if ((diroffset == 0) && (ldep->de_StartCluster != dirclust)) { 411 kprintf("deget(): . entry at clust %ld != %ld\n", 412 dirclust, ldep->de_StartCluster); 413 ldep->de_StartCluster = dirclust; 414 } 415 416 nvp->v_type = VDIR; 417 if (ldep->de_StartCluster != MSDOSFSROOT) { 418 error = pcbmap(ldep, 0xffff, NULL, &size, NULL); 419 if (error == E2BIG) { 420 ldep->de_FileSize = de_cn2off(pmp, size); 421 error = 0; 422 } else 423 kprintf("deget(): pcbmap returned %d\n", error); 424 } 425 } else { 426 nvp->v_type = VREG; 427 } 428 getmicrouptime(&tv); 429 SETHIGH(ldep->de_modrev, tv.tv_sec); 430 SETLOW(ldep->de_modrev, tv.tv_usec * 4294); 431 ldep->de_devvp = pmp->pm_devvp; 432 vref(ldep->de_devvp); 433 vinitvmio(nvp, ldep->de_FileSize); 434 /* 435 * Leave nvp locked and refd so the returned inode is effectively 436 * locked and refd. 437 */ 438 *depp = ldep; 439 return (0); 440 } 441 442 int 443 deupdat(struct denode *dep, int waitfor) 444 { 445 int error; 446 struct buf *bp; 447 struct direntry *dirp; 448 struct timespec ts; 449 450 if (DETOV(dep)->v_mount->mnt_flag & MNT_RDONLY) 451 return (0); 452 getnanotime(&ts); 453 DETIMES(dep, &ts, &ts, &ts); 454 if ((dep->de_flag & DE_MODIFIED) == 0) 455 return (0); 456 dep->de_flag &= ~DE_MODIFIED; 457 if (dep->de_Attributes & ATTR_DIRECTORY) 458 return (0); 459 if (dep->de_refcnt <= 0) 460 return (0); 461 error = readde(dep, &bp, &dirp); 462 if (error) 463 return (error); 464 DE_EXTERNALIZE(dirp, dep); 465 if (waitfor) 466 return (bwrite(bp)); 467 else { 468 bdwrite(bp); 469 return (0); 470 } 471 } 472 473 /* 474 * Truncate the file described by dep to the length specified by length. 475 */ 476 int 477 detrunc(struct denode *dep, u_long length, int flags) 478 { 479 int error; 480 int allerror; 481 u_long eofentry; 482 u_long chaintofree; 483 daddr_t bn, cn; 484 int boff; 485 int isadir = dep->de_Attributes & ATTR_DIRECTORY; 486 struct buf *bp; 487 struct msdosfsmount *pmp = dep->de_pmp; 488 489 #ifdef MSDOSFS_DEBUG 490 kprintf("detrunc(): file %s, length %lu, flags %x\n", dep->de_Name, length, flags); 491 #endif 492 493 /* 494 * Disallow attempts to truncate the root directory since it is of 495 * fixed size. That's just the way dos filesystems are. We use 496 * the VROOT bit in the vnode because checking for the directory 497 * bit and a startcluster of 0 in the denode is not adequate to 498 * recognize the root directory at this point in a file or 499 * directory's life. 500 */ 501 if ((DETOV(dep)->v_flag & VROOT) && !FAT32(pmp)) { 502 kprintf("detrunc(): can't truncate root directory, clust %ld, offset %ld\n", 503 dep->de_dirclust, dep->de_diroffset); 504 return (EINVAL); 505 } 506 507 508 if (dep->de_FileSize < length) { 509 vnode_pager_setsize(DETOV(dep), length); 510 return deextend(dep, length); 511 } 512 513 /* 514 * If the desired length is 0 then remember the starting cluster of 515 * the file and set the StartCluster field in the directory entry 516 * to 0. If the desired length is not zero, then get the number of 517 * the last cluster in the shortened file. Then get the number of 518 * the first cluster in the part of the file that is to be freed. 519 * Then set the next cluster pointer in the last cluster of the 520 * file to CLUST_EOFE. 521 */ 522 if (length == 0) { 523 chaintofree = dep->de_StartCluster; 524 dep->de_StartCluster = 0; 525 eofentry = ~0; 526 } else { 527 error = pcbmap(dep, de_clcount(pmp, length) - 1, 528 NULL, &eofentry, NULL); 529 if (error) { 530 #ifdef MSDOSFS_DEBUG 531 kprintf("detrunc(): pcbmap fails %d\n", error); 532 #endif 533 return (error); 534 } 535 } 536 537 fc_purge(dep, de_clcount(pmp, length)); 538 539 /* 540 * If the new length is not a multiple of the cluster size then we 541 * must zero the tail end of the new last cluster in case it 542 * becomes part of the file again because of a seek. 543 */ 544 if ((boff = length & pmp->pm_crbomask) != 0) { 545 if (isadir) { 546 bn = xcntobn(pmp, eofentry); 547 error = bread(pmp->pm_devvp, de_bntodoff(pmp, bn), pmp->pm_bpcluster, &bp); 548 } else { 549 cn = de_cluster(pmp, length); 550 error = bread(DETOV(dep), de_cn2doff(pmp, cn), pmp->pm_bpcluster, &bp); 551 } 552 if (error) { 553 brelse(bp); 554 #ifdef MSDOSFS_DEBUG 555 kprintf("detrunc(): bread fails %d\n", error); 556 #endif 557 return (error); 558 } 559 /* 560 * is this the right place for it? 561 */ 562 bzero(bp->b_data + boff, pmp->pm_bpcluster - boff); 563 if (flags & IO_SYNC) 564 bwrite(bp); 565 else 566 bdwrite(bp); 567 } 568 569 /* 570 * Write out the updated directory entry. Even if the update fails 571 * we free the trailing clusters. 572 */ 573 dep->de_FileSize = length; 574 if (!isadir) 575 dep->de_flag |= DE_UPDATE|DE_MODIFIED; 576 allerror = vtruncbuf(DETOV(dep), length, pmp->pm_bpcluster); 577 #ifdef MSDOSFS_DEBUG 578 if (allerror) 579 kprintf("detrunc(): vtruncbuf error %d\n", allerror); 580 #endif 581 error = deupdat(dep, 1); 582 if (error && (allerror == 0)) 583 allerror = error; 584 #ifdef MSDOSFS_DEBUG 585 kprintf("detrunc(): allerror %d, eofentry %lu\n", 586 allerror, eofentry); 587 #endif 588 589 /* 590 * If we need to break the cluster chain for the file then do it 591 * now. 592 */ 593 if (eofentry != ~0) { 594 error = fatentry(FAT_GET_AND_SET, pmp, eofentry, 595 &chaintofree, CLUST_EOFE); 596 if (error) { 597 #ifdef MSDOSFS_DEBUG 598 kprintf("detrunc(): fatentry errors %d\n", error); 599 #endif 600 return (error); 601 } 602 fc_setcache(dep, FC_LASTFC, de_cluster(pmp, length - 1), 603 eofentry); 604 } 605 606 /* 607 * Now free the clusters removed from the file because of the 608 * truncation. 609 */ 610 if (chaintofree != 0 && !MSDOSFSEOF(pmp, chaintofree)) 611 freeclusterchain(pmp, chaintofree); 612 613 return (allerror); 614 } 615 616 /* 617 * Extend the file described by dep to length specified by length. 618 */ 619 int 620 deextend(struct denode *dep, u_long length) 621 { 622 struct msdosfsmount *pmp = dep->de_pmp; 623 u_long count; 624 int error; 625 626 /* 627 * The root of a DOS filesystem cannot be extended. 628 */ 629 if ((DETOV(dep)->v_flag & VROOT) && !FAT32(pmp)) 630 return (EINVAL); 631 632 /* 633 * Directories cannot be extended. 634 */ 635 if (dep->de_Attributes & ATTR_DIRECTORY) 636 return (EISDIR); 637 638 if (length <= dep->de_FileSize) 639 panic("deextend: file too large"); 640 641 /* 642 * Compute the number of clusters to allocate. 643 */ 644 count = de_clcount(pmp, length) - de_clcount(pmp, dep->de_FileSize); 645 if (count > 0) { 646 if (count > pmp->pm_freeclustercount) 647 return (ENOSPC); 648 error = extendfile(dep, count, NULL, NULL, DE_CLEAR); 649 if (error) { 650 /* truncate the added clusters away again */ 651 detrunc(dep, dep->de_FileSize, 0); 652 return (error); 653 } 654 } 655 dep->de_FileSize = length; 656 dep->de_flag |= DE_UPDATE|DE_MODIFIED; 657 return (deupdat(dep, 1)); 658 } 659 660 /* 661 * msdosfs_reclaim(struct vnode *a_vp) 662 */ 663 int 664 msdosfs_reclaim(struct vop_reclaim_args *ap) 665 { 666 struct vnode *vp = ap->a_vp; 667 struct denode *dep = VTODE(vp); 668 669 #ifdef MSDOSFS_DEBUG 670 kprintf("msdosfs_reclaim(): dep %p, file %s, refcnt %ld\n", 671 dep, dep ? (char *)dep->de_Name : "?", dep ? dep->de_refcnt : -1); 672 #endif 673 674 if (prtactive && vp->v_sysref.refcnt > 1) 675 vprint("msdosfs_reclaim(): pushing active", vp); 676 /* 677 * Remove the denode from its hash chain. 678 */ 679 vp->v_data = NULL; 680 if (dep) { 681 msdosfs_hashrem(dep); 682 if (dep->de_devvp) { 683 vrele(dep->de_devvp); 684 dep->de_devvp = 0; 685 } 686 kfree(dep, M_MSDOSFSNODE); 687 } 688 return (0); 689 } 690 691 /* 692 * msdosfs_inactive(struct vnode *a_vp) 693 */ 694 int 695 msdosfs_inactive(struct vop_inactive_args *ap) 696 { 697 struct vnode *vp = ap->a_vp; 698 struct denode *dep = VTODE(vp); 699 int error = 0; 700 701 #ifdef MSDOSFS_DEBUG 702 kprintf("msdosfs_inactive(): dep %p, de_Name[0] %x\n", 703 dep, (dep ? dep->de_Name[0] : 0)); 704 #endif 705 706 if (prtactive && vp->v_sysref.refcnt > 1) 707 vprint("msdosfs_inactive(): pushing active", vp); 708 709 /* 710 * Ignore denodes related to stale file handles. 711 */ 712 if (dep == NULL || dep->de_Name[0] == SLOT_DELETED) 713 goto out; 714 715 /* 716 * If the file has been deleted and it is on a read/write 717 * filesystem, then truncate the file, and mark the directory slot 718 * as empty. (This may not be necessary for the dos filesystem.) 719 */ 720 #ifdef MSDOSFS_DEBUG 721 kprintf("msdosfs_inactive(): dep %p, refcnt %ld, mntflag %x, MNT_RDONLY %x\n", 722 dep, dep->de_refcnt, vp->v_mount->mnt_flag, MNT_RDONLY); 723 #endif 724 if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 725 error = detrunc(dep, (u_long) 0, 0); 726 dep->de_flag |= DE_UPDATE; 727 dep->de_Name[0] = SLOT_DELETED; 728 } 729 deupdat(dep, 0); 730 731 out: 732 /* 733 * If we are done with the denode, reclaim it 734 * so that it can be reused immediately. 735 */ 736 #ifdef MSDOSFS_DEBUG 737 kprintf("msdosfs_inactive(): v_sysrefs %d, de_Name[0] %x\n", 738 vp->v_sysref.refcnt, (dep ? dep->de_Name[0] : 0)); 739 #endif 740 if (dep == NULL || dep->de_Name[0] == SLOT_DELETED) 741 vrecycle(vp); 742 return (error); 743 } 744