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 1.34 2007/08/08 00:12:51 swildner 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; 218 219 lwkt_gettoken(&ilock, &dehash_token); 220 msdosfs_hashrem(ip); 221 ip->de_dirclust = new_dirclust; 222 ip->de_diroffset = new_diroffset; 223 msdosfs_hashins(ip); 224 lwkt_reltoken(&ilock); 225 } 226 227 /* 228 * If deget() succeeds it returns with the gotten denode locked(). 229 * 230 * pmp - address of msdosfsmount structure of the filesystem containing 231 * the denode of interest. The pm_dev field and the address of 232 * the msdosfsmount structure are used. 233 * dirclust - which cluster bp contains, if dirclust is 0 (root directory) 234 * diroffset is relative to the beginning of the root directory, 235 * otherwise it is cluster relative. 236 * diroffset - offset past begin of cluster of denode we want 237 * depp - returns the address of the gotten denode. 238 */ 239 int 240 deget(struct msdosfsmount *pmp, /* so we know the maj/min number */ 241 u_long dirclust, /* cluster this dir entry came from */ 242 u_long diroffset, /* index of entry within the cluster */ 243 struct denode **depp) /* returns the addr of the gotten denode */ 244 { 245 int error; 246 cdev_t dev = pmp->pm_dev; 247 struct mount *mntp = pmp->pm_mountp; 248 struct direntry *direntptr; 249 struct denode *ldep; 250 struct vnode *nvp; 251 struct buf *bp; 252 struct timeval tv; 253 254 #ifdef MSDOSFS_DEBUG 255 kprintf("deget(pmp %p, dirclust %lu, diroffset %lx, depp %p)\n", 256 pmp, dirclust, diroffset, depp); 257 #endif 258 259 /* 260 * On FAT32 filesystems, root is a (more or less) normal 261 * directory 262 */ 263 if (FAT32(pmp) && dirclust == MSDOSFSROOT) 264 dirclust = pmp->pm_rootdirblk; 265 266 again: 267 /* 268 * See if the denode is in the denode cache. Use the location of 269 * the directory entry to compute the hash value. For subdir use 270 * address of "." entry. For root dir (if not FAT32) use cluster 271 * MSDOSFSROOT, offset MSDOSFSROOT_OFS 272 * 273 * NOTE: The check for de_refcnt > 0 below insures the denode being 274 * examined does not represent an unlinked but still open file. 275 * These files are not to be accessible even when the directory 276 * entry that represented the file happens to be reused while the 277 * deleted file is still open. 278 */ 279 ldep = msdosfs_hashget(dev, dirclust, diroffset); 280 if (ldep) { 281 *depp = ldep; 282 return (0); 283 } 284 285 /* 286 * Do the MALLOC before the getnewvnode since doing so afterward 287 * might cause a bogus v_data pointer to get dereferenced 288 * elsewhere if MALLOC should block. 289 */ 290 MALLOC(ldep, struct denode *, sizeof(struct denode), M_MSDOSFSNODE, M_WAITOK); 291 292 /* 293 * Directory entry was not in cache, have to create a vnode and 294 * copy it from the passed disk buffer. 295 */ 296 297 /* getnewvnode() does a vref() on the vnode */ 298 error = getnewvnode(VT_MSDOSFS, mntp, &nvp, VLKTIMEOUT, 0); 299 if (error) { 300 *depp = NULL; 301 FREE(ldep, M_MSDOSFSNODE); 302 return error; 303 } 304 305 bzero((caddr_t)ldep, sizeof *ldep); 306 ldep->de_vnode = nvp; 307 ldep->de_flag = 0; 308 ldep->de_devvp = 0; 309 ldep->de_dev = dev; 310 ldep->de_dirclust = dirclust; 311 ldep->de_diroffset = diroffset; 312 fc_purge(ldep, 0); /* init the fat cache for this denode */ 313 314 /* 315 * Insert the denode into the hash queue. If a collision occurs 316 * throw away the vnode and try again. 317 */ 318 error = msdosfs_hashins(ldep); 319 if (error == EBUSY) { 320 nvp->v_type = VBAD; 321 vx_put(nvp); 322 kfree(ldep, M_MSDOSFSNODE); 323 goto again; 324 } else if (error) { 325 nvp->v_type = VBAD; 326 vx_put(nvp); 327 kfree(ldep, M_MSDOSFSNODE); 328 return (EINVAL); 329 } 330 nvp->v_data = ldep; 331 ldep->de_pmp = pmp; 332 ldep->de_refcnt = 1; 333 /* 334 * Copy the directory entry into the denode area of the vnode. 335 */ 336 if ((dirclust == MSDOSFSROOT 337 || (FAT32(pmp) && dirclust == pmp->pm_rootdirblk)) 338 && diroffset == MSDOSFSROOT_OFS) { 339 /* 340 * Directory entry for the root directory. There isn't one, 341 * so we manufacture one. We should probably rummage 342 * through the root directory and find a label entry (if it 343 * exists), and then use the time and date from that entry 344 * as the time and date for the root denode. 345 */ 346 nvp->v_flag |= VROOT; /* should be further down XXX */ 347 348 ldep->de_Attributes = ATTR_DIRECTORY; 349 ldep->de_LowerCase = 0; 350 if (FAT32(pmp)) 351 ldep->de_StartCluster = pmp->pm_rootdirblk; 352 /* de_FileSize will be filled in further down */ 353 else { 354 ldep->de_StartCluster = MSDOSFSROOT; 355 ldep->de_FileSize = pmp->pm_rootdirsize * DEV_BSIZE; 356 } 357 /* 358 * fill in time and date so that dos2unixtime() doesn't 359 * spit up when called from msdosfs_getattr() with root 360 * denode 361 */ 362 ldep->de_CHun = 0; 363 ldep->de_CTime = 0x0000; /* 00:00:00 */ 364 ldep->de_CDate = (0 << DD_YEAR_SHIFT) | (1 << DD_MONTH_SHIFT) 365 | (1 << DD_DAY_SHIFT); 366 /* Jan 1, 1980 */ 367 ldep->de_ADate = ldep->de_CDate; 368 ldep->de_MTime = ldep->de_CTime; 369 ldep->de_MDate = ldep->de_CDate; 370 /* leave the other fields as garbage */ 371 } else { 372 error = readep(pmp, dirclust, diroffset, &bp, &direntptr); 373 if (error) { 374 /* 375 * The denode does not contain anything useful, so 376 * it would be wrong to leave it on its hash chain. 377 * Arrange for vput() to just forget about it. 378 */ 379 ldep->de_Name[0] = SLOT_DELETED; 380 nvp->v_type = VBAD; 381 382 vx_put(nvp); 383 *depp = NULL; 384 return (error); 385 } 386 DE_INTERNALIZE(ldep, direntptr); 387 brelse(bp); 388 } 389 390 /* 391 * Fill in a few fields of the vnode and finish filling in the 392 * denode. Then return the address of the found denode. 393 */ 394 if (ldep->de_Attributes & ATTR_DIRECTORY) { 395 /* 396 * Since DOS directory entries that describe directories 397 * have 0 in the filesize field, we take this opportunity 398 * to find out the length of the directory and plug it into 399 * the denode structure. 400 */ 401 u_long size; 402 403 /* 404 * XXX Sometimes, these arrives that . entry have cluster 405 * number 0, when it shouldn't. Use real cluster number 406 * instead of what is written in directory entry. 407 */ 408 if ((diroffset == 0) && (ldep->de_StartCluster != dirclust)) { 409 kprintf("deget(): . entry at clust %ld != %ld\n", 410 dirclust, ldep->de_StartCluster); 411 ldep->de_StartCluster = dirclust; 412 } 413 414 nvp->v_type = VDIR; 415 if (ldep->de_StartCluster != MSDOSFSROOT) { 416 error = pcbmap(ldep, 0xffff, NULL, &size, NULL); 417 if (error == E2BIG) { 418 ldep->de_FileSize = de_cn2off(pmp, size); 419 error = 0; 420 } else 421 kprintf("deget(): pcbmap returned %d\n", error); 422 } 423 } else { 424 nvp->v_type = VREG; 425 } 426 getmicrouptime(&tv); 427 SETHIGH(ldep->de_modrev, tv.tv_sec); 428 SETLOW(ldep->de_modrev, tv.tv_usec * 4294); 429 ldep->de_devvp = pmp->pm_devvp; 430 vref(ldep->de_devvp); 431 vinitvmio(nvp, ldep->de_FileSize); 432 /* 433 * Leave nvp locked and refd so the returned inode is effectively 434 * locked and refd. 435 */ 436 *depp = ldep; 437 return (0); 438 } 439 440 int 441 deupdat(struct denode *dep, int waitfor) 442 { 443 int error; 444 struct buf *bp; 445 struct direntry *dirp; 446 struct timespec ts; 447 448 if (DETOV(dep)->v_mount->mnt_flag & MNT_RDONLY) 449 return (0); 450 getnanotime(&ts); 451 DETIMES(dep, &ts, &ts, &ts); 452 if ((dep->de_flag & DE_MODIFIED) == 0) 453 return (0); 454 dep->de_flag &= ~DE_MODIFIED; 455 if (dep->de_Attributes & ATTR_DIRECTORY) 456 return (0); 457 if (dep->de_refcnt <= 0) 458 return (0); 459 error = readde(dep, &bp, &dirp); 460 if (error) 461 return (error); 462 DE_EXTERNALIZE(dirp, dep); 463 if (waitfor) 464 return (bwrite(bp)); 465 else { 466 bdwrite(bp); 467 return (0); 468 } 469 } 470 471 /* 472 * Truncate the file described by dep to the length specified by length. 473 */ 474 int 475 detrunc(struct denode *dep, u_long length, int flags) 476 { 477 int error; 478 int allerror; 479 u_long eofentry; 480 u_long chaintofree; 481 daddr_t bn, cn; 482 int boff; 483 int isadir = dep->de_Attributes & ATTR_DIRECTORY; 484 struct buf *bp; 485 struct msdosfsmount *pmp = dep->de_pmp; 486 487 #ifdef MSDOSFS_DEBUG 488 kprintf("detrunc(): file %s, length %lu, flags %x\n", dep->de_Name, length, flags); 489 #endif 490 491 /* 492 * Disallow attempts to truncate the root directory since it is of 493 * fixed size. That's just the way dos filesystems are. We use 494 * the VROOT bit in the vnode because checking for the directory 495 * bit and a startcluster of 0 in the denode is not adequate to 496 * recognize the root directory at this point in a file or 497 * directory's life. 498 */ 499 if ((DETOV(dep)->v_flag & VROOT) && !FAT32(pmp)) { 500 kprintf("detrunc(): can't truncate root directory, clust %ld, offset %ld\n", 501 dep->de_dirclust, dep->de_diroffset); 502 return (EINVAL); 503 } 504 505 506 if (dep->de_FileSize < length) { 507 vnode_pager_setsize(DETOV(dep), length); 508 return deextend(dep, length); 509 } 510 511 /* 512 * If the desired length is 0 then remember the starting cluster of 513 * the file and set the StartCluster field in the directory entry 514 * to 0. If the desired length is not zero, then get the number of 515 * the last cluster in the shortened file. Then get the number of 516 * the first cluster in the part of the file that is to be freed. 517 * Then set the next cluster pointer in the last cluster of the 518 * file to CLUST_EOFE. 519 */ 520 if (length == 0) { 521 chaintofree = dep->de_StartCluster; 522 dep->de_StartCluster = 0; 523 eofentry = ~0; 524 } else { 525 error = pcbmap(dep, de_clcount(pmp, length) - 1, 526 NULL, &eofentry, NULL); 527 if (error) { 528 #ifdef MSDOSFS_DEBUG 529 kprintf("detrunc(): pcbmap fails %d\n", error); 530 #endif 531 return (error); 532 } 533 } 534 535 fc_purge(dep, de_clcount(pmp, length)); 536 537 /* 538 * If the new length is not a multiple of the cluster size then we 539 * must zero the tail end of the new last cluster in case it 540 * becomes part of the file again because of a seek. 541 */ 542 if ((boff = length & pmp->pm_crbomask) != 0) { 543 if (isadir) { 544 bn = xcntobn(pmp, eofentry); 545 error = bread(pmp->pm_devvp, de_bntodoff(pmp, bn), pmp->pm_bpcluster, &bp); 546 } else { 547 cn = de_cluster(pmp, length); 548 error = bread(DETOV(dep), de_cn2doff(pmp, cn), pmp->pm_bpcluster, &bp); 549 } 550 if (error) { 551 brelse(bp); 552 #ifdef MSDOSFS_DEBUG 553 kprintf("detrunc(): bread fails %d\n", error); 554 #endif 555 return (error); 556 } 557 /* 558 * is this the right place for it? 559 */ 560 bzero(bp->b_data + boff, pmp->pm_bpcluster - boff); 561 if (flags & IO_SYNC) 562 bwrite(bp); 563 else 564 bdwrite(bp); 565 } 566 567 /* 568 * Write out the updated directory entry. Even if the update fails 569 * we free the trailing clusters. 570 */ 571 dep->de_FileSize = length; 572 if (!isadir) 573 dep->de_flag |= DE_UPDATE|DE_MODIFIED; 574 allerror = vtruncbuf(DETOV(dep), length, pmp->pm_bpcluster); 575 #ifdef MSDOSFS_DEBUG 576 if (allerror) 577 kprintf("detrunc(): vtruncbuf error %d\n", allerror); 578 #endif 579 error = deupdat(dep, 1); 580 if (error && (allerror == 0)) 581 allerror = error; 582 #ifdef MSDOSFS_DEBUG 583 kprintf("detrunc(): allerror %d, eofentry %lu\n", 584 allerror, eofentry); 585 #endif 586 587 /* 588 * If we need to break the cluster chain for the file then do it 589 * now. 590 */ 591 if (eofentry != ~0) { 592 error = fatentry(FAT_GET_AND_SET, pmp, eofentry, 593 &chaintofree, CLUST_EOFE); 594 if (error) { 595 #ifdef MSDOSFS_DEBUG 596 kprintf("detrunc(): fatentry errors %d\n", error); 597 #endif 598 return (error); 599 } 600 fc_setcache(dep, FC_LASTFC, de_cluster(pmp, length - 1), 601 eofentry); 602 } 603 604 /* 605 * Now free the clusters removed from the file because of the 606 * truncation. 607 */ 608 if (chaintofree != 0 && !MSDOSFSEOF(pmp, chaintofree)) 609 freeclusterchain(pmp, chaintofree); 610 611 return (allerror); 612 } 613 614 /* 615 * Extend the file described by dep to length specified by length. 616 */ 617 int 618 deextend(struct denode *dep, u_long length) 619 { 620 struct msdosfsmount *pmp = dep->de_pmp; 621 u_long count; 622 int error; 623 624 /* 625 * The root of a DOS filesystem cannot be extended. 626 */ 627 if ((DETOV(dep)->v_flag & VROOT) && !FAT32(pmp)) 628 return (EINVAL); 629 630 /* 631 * Directories cannot be extended. 632 */ 633 if (dep->de_Attributes & ATTR_DIRECTORY) 634 return (EISDIR); 635 636 if (length <= dep->de_FileSize) 637 panic("deextend: file too large"); 638 639 /* 640 * Compute the number of clusters to allocate. 641 */ 642 count = de_clcount(pmp, length) - de_clcount(pmp, dep->de_FileSize); 643 if (count > 0) { 644 if (count > pmp->pm_freeclustercount) 645 return (ENOSPC); 646 error = extendfile(dep, count, NULL, NULL, DE_CLEAR); 647 if (error) { 648 /* truncate the added clusters away again */ 649 detrunc(dep, dep->de_FileSize, 0); 650 return (error); 651 } 652 } 653 dep->de_FileSize = length; 654 dep->de_flag |= DE_UPDATE|DE_MODIFIED; 655 return (deupdat(dep, 1)); 656 } 657 658 /* 659 * msdosfs_reclaim(struct vnode *a_vp) 660 */ 661 int 662 msdosfs_reclaim(struct vop_reclaim_args *ap) 663 { 664 struct vnode *vp = ap->a_vp; 665 struct denode *dep = VTODE(vp); 666 667 #ifdef MSDOSFS_DEBUG 668 kprintf("msdosfs_reclaim(): dep %p, file %s, refcnt %ld\n", 669 dep, dep ? (char *)dep->de_Name : "?", dep ? dep->de_refcnt : -1); 670 #endif 671 672 if (prtactive && vp->v_sysref.refcnt > 1) 673 vprint("msdosfs_reclaim(): pushing active", vp); 674 /* 675 * Remove the denode from its hash chain. 676 */ 677 vp->v_data = NULL; 678 if (dep) { 679 msdosfs_hashrem(dep); 680 if (dep->de_devvp) { 681 vrele(dep->de_devvp); 682 dep->de_devvp = 0; 683 } 684 kfree(dep, M_MSDOSFSNODE); 685 } 686 return (0); 687 } 688 689 /* 690 * msdosfs_inactive(struct vnode *a_vp) 691 */ 692 int 693 msdosfs_inactive(struct vop_inactive_args *ap) 694 { 695 struct vnode *vp = ap->a_vp; 696 struct denode *dep = VTODE(vp); 697 int error = 0; 698 699 #ifdef MSDOSFS_DEBUG 700 kprintf("msdosfs_inactive(): dep %p, de_Name[0] %x\n", 701 dep, (dep ? dep->de_Name[0] : 0)); 702 #endif 703 704 if (prtactive && vp->v_sysref.refcnt > 1) 705 vprint("msdosfs_inactive(): pushing active", vp); 706 707 /* 708 * Ignore denodes related to stale file handles. 709 */ 710 if (dep == NULL || dep->de_Name[0] == SLOT_DELETED) 711 goto out; 712 713 /* 714 * If the file has been deleted and it is on a read/write 715 * filesystem, then truncate the file, and mark the directory slot 716 * as empty. (This may not be necessary for the dos filesystem.) 717 */ 718 #ifdef MSDOSFS_DEBUG 719 kprintf("msdosfs_inactive(): dep %p, refcnt %ld, mntflag %x, MNT_RDONLY %x\n", 720 dep, dep->de_refcnt, vp->v_mount->mnt_flag, MNT_RDONLY); 721 #endif 722 if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 723 error = detrunc(dep, (u_long) 0, 0); 724 dep->de_flag |= DE_UPDATE; 725 dep->de_Name[0] = SLOT_DELETED; 726 } 727 deupdat(dep, 0); 728 729 out: 730 /* 731 * If we are done with the denode, reclaim it 732 * so that it can be reused immediately. 733 */ 734 #ifdef MSDOSFS_DEBUG 735 kprintf("msdosfs_inactive(): v_sysrefs %d, de_Name[0] %x\n", 736 vp->v_sysref.refcnt, (dep ? dep->de_Name[0] : 0)); 737 #endif 738 if (dep == NULL || dep->de_Name[0] == SLOT_DELETED) 739 vrecycle(vp); 740 return (error); 741 } 742