Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/fs/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 * SPDX-License-Identifier: BSD-4-Clause 6 * 7 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. 8 * Copyright (C) 1994, 1995, 1997 TooLs GmbH. 9 * All rights reserved. 10 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by TooLs GmbH. 23 * 4. The name of TooLs GmbH may not be used to endorse or promote products 24 * derived from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 27 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 28 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 29 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 30 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 31 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 32 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 33 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 34 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 35 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 36 */ 37 /*- 38 * Written by Paul Popelka (paulp@uts.amdahl.com) 39 * 40 * You can do anything you want with this software, just don't say you wrote 41 * it, and don't remove this notice. 42 * 43 * This software is provided "as is". 44 * 45 * The author supplies this software to be publicly redistributed on the 46 * understanding that the author is not responsible for the correct 47 * functioning of this software in any circumstances and is not liable for 48 * any damages caused by this software. 49 * 50 * October 1992 51 */ 52 53 #include <sys/param.h> 54 #include <sys/systm.h> 55 #include <sys/buf.h> 56 #include <sys/clock.h> 57 #include <sys/kernel.h> 58 #include <sys/malloc.h> 59 #include <sys/mount.h> 60 #include <sys/vmmeter.h> 61 #include <sys/vnode.h> 62 63 #include <vm/vm.h> 64 #include <vm/vm_extern.h> 65 66 #include <fs/msdosfs/bpb.h> 67 #include <fs/msdosfs/direntry.h> 68 #include <fs/msdosfs/denode.h> 69 #include <fs/msdosfs/fat.h> 70 #include <fs/msdosfs/msdosfsmount.h> 71 72 static MALLOC_DEFINE(M_MSDOSFSNODE, "msdosfs_node", "MSDOSFS vnode private part"); 73 74 static int 75 de_vncmpf(struct vnode *vp, void *arg) 76 { 77 struct denode *de; 78 uint64_t *a; 79 80 a = arg; 81 de = VTODE(vp); 82 return (de->de_inode != *a) || (de->de_refcnt <= 0); 83 } 84 85 /* 86 * If deget() succeeds it returns with the gotten denode locked(). 87 * 88 * pmp - address of msdosfsmount structure of the filesystem containing 89 * the denode of interest. The address of 90 * the msdosfsmount structure are used. 91 * dirclust - which cluster bp contains, if dirclust is 0 (root directory) 92 * diroffset is relative to the beginning of the root directory, 93 * otherwise it is cluster relative. 94 * diroffset - offset past begin of cluster of denode we want 95 * lkflags - locking flags (LK_NOWAIT) 96 * depp - returns the address of the gotten denode. 97 */ 98 int 99 deget(struct msdosfsmount *pmp, u_long dirclust, u_long diroffset, 100 int lkflags, struct denode **depp) 101 { 102 int error; 103 uint64_t inode; 104 struct mount *mntp = pmp->pm_mountp; 105 struct direntry *direntptr; 106 struct denode *ldep; 107 struct vnode *nvp, *xvp; 108 struct buf *bp; 109 110 #ifdef MSDOSFS_DEBUG 111 printf("deget(pmp %p, dirclust %lu, diroffset %lx, flags %#x, " 112 "depp %p)\n", 113 pmp, dirclust, diroffset, flags, depp); 114 #endif 115 MPASS((lkflags & LK_TYPE_MASK) == LK_EXCLUSIVE); 116 117 /* 118 * On FAT32 filesystems, root is a (more or less) normal 119 * directory 120 */ 121 if (FAT32(pmp) && dirclust == MSDOSFSROOT) 122 dirclust = pmp->pm_rootdirblk; 123 124 /* 125 * See if the denode is in the denode cache. Use the location of 126 * the directory entry to compute the hash value. For subdir use 127 * address of "." entry. For root dir (if not FAT32) use cluster 128 * MSDOSFSROOT, offset MSDOSFSROOT_OFS 129 * 130 * NOTE: de_vncmpf will explicitly skip any denodes that do not have 131 * a de_refcnt > 0. This insures that that we do not attempt to use 132 * a denode that represents an unlinked but still open file. 133 * These files are not to be accessible even when the directory 134 * entry that represented the file happens to be reused while the 135 * deleted file is still open. 136 */ 137 inode = (uint64_t)pmp->pm_bpcluster * dirclust + diroffset; 138 139 error = vfs_hash_get(mntp, inode, lkflags, curthread, &nvp, 140 de_vncmpf, &inode); 141 if (error) 142 return (error); 143 if (nvp != NULL) { 144 *depp = VTODE(nvp); 145 KASSERT((*depp)->de_dirclust == dirclust, ("wrong dirclust")); 146 KASSERT((*depp)->de_diroffset == diroffset, ("wrong diroffset")); 147 return (0); 148 } 149 ldep = malloc(sizeof(struct denode), M_MSDOSFSNODE, M_WAITOK | M_ZERO); 150 151 /* 152 * Directory entry was not in cache, have to create a vnode and 153 * copy it from the passed disk buffer. 154 */ 155 /* getnewvnode() does a VREF() on the vnode */ 156 error = getnewvnode("msdosfs", mntp, &msdosfs_vnodeops, &nvp); 157 if (error) { 158 *depp = NULL; 159 free(ldep, M_MSDOSFSNODE); 160 return error; 161 } 162 nvp->v_data = ldep; 163 ldep->de_vnode = nvp; 164 ldep->de_flag = 0; 165 ldep->de_dirclust = dirclust; 166 ldep->de_diroffset = diroffset; 167 ldep->de_inode = inode; 168 lockmgr(nvp->v_vnlock, LK_EXCLUSIVE, NULL); 169 VN_LOCK_AREC(nvp); /* for doscheckpath */ 170 fc_purge(ldep, 0); /* init the FAT cache for this denode */ 171 error = insmntque(nvp, mntp); 172 if (error != 0) { 173 free(ldep, M_MSDOSFSNODE); 174 *depp = NULL; 175 return (error); 176 } 177 error = vfs_hash_insert(nvp, inode, lkflags, curthread, &xvp, 178 de_vncmpf, &inode); 179 if (error) { 180 *depp = NULL; 181 return (error); 182 } 183 if (xvp != NULL) { 184 *depp = xvp->v_data; 185 return (0); 186 } 187 188 ldep->de_pmp = pmp; 189 ldep->de_refcnt = 1; 190 /* 191 * Copy the directory entry into the denode area of the vnode. 192 */ 193 if ((dirclust == MSDOSFSROOT 194 || (FAT32(pmp) && dirclust == pmp->pm_rootdirblk)) 195 && diroffset == MSDOSFSROOT_OFS) { 196 /* 197 * Directory entry for the root directory. There isn't one, 198 * so we manufacture one. We should probably rummage 199 * through the root directory and find a label entry (if it 200 * exists), and then use the time and date from that entry 201 * as the time and date for the root denode. 202 */ 203 nvp->v_vflag |= VV_ROOT; /* should be further down XXX */ 204 205 ldep->de_Attributes = ATTR_DIRECTORY; 206 ldep->de_LowerCase = 0; 207 if (FAT32(pmp)) 208 ldep->de_StartCluster = pmp->pm_rootdirblk; 209 /* de_FileSize will be filled in further down */ 210 else { 211 ldep->de_StartCluster = MSDOSFSROOT; 212 ldep->de_FileSize = pmp->pm_rootdirsize * DEV_BSIZE; 213 } 214 /* 215 * fill in time and date so that fattime2timespec() doesn't 216 * spit up when called from msdosfs_getattr() with root 217 * denode 218 */ 219 ldep->de_CHun = 0; 220 ldep->de_CTime = 0x0000; /* 00:00:00 */ 221 ldep->de_CDate = (0 << DD_YEAR_SHIFT) | (1 << DD_MONTH_SHIFT) 222 | (1 << DD_DAY_SHIFT); 223 /* Jan 1, 1980 */ 224 ldep->de_ADate = ldep->de_CDate; 225 ldep->de_MTime = ldep->de_CTime; 226 ldep->de_MDate = ldep->de_CDate; 227 /* leave the other fields as garbage */ 228 } else { 229 error = readep(pmp, dirclust, diroffset, &bp, &direntptr); 230 if (error) { 231 /* 232 * The denode does not contain anything useful, so 233 * it would be wrong to leave it on its hash chain. 234 * Arrange for vput() to just forget about it. 235 */ 236 ldep->de_Name[0] = SLOT_DELETED; 237 vgone(nvp); 238 vput(nvp); 239 *depp = NULL; 240 return (error); 241 } 242 (void)DE_INTERNALIZE(ldep, direntptr); 243 brelse(bp); 244 } 245 246 /* 247 * Fill in a few fields of the vnode and finish filling in the 248 * denode. Then return the address of the found denode. 249 */ 250 if (ldep->de_Attributes & ATTR_DIRECTORY) { 251 /* 252 * Since DOS directory entries that describe directories 253 * have 0 in the filesize field, we take this opportunity 254 * to find out the length of the directory and plug it into 255 * the denode structure. 256 */ 257 u_long size; 258 259 /* 260 * XXX it sometimes happens that the "." entry has cluster 261 * number 0 when it shouldn't. Use the actual cluster number 262 * instead of what is written in directory entry. 263 */ 264 if (diroffset == 0 && ldep->de_StartCluster != dirclust) { 265 #ifdef MSDOSFS_DEBUG 266 printf("deget(): \".\" entry at clust %lu != %lu\n", 267 dirclust, ldep->de_StartCluster); 268 #endif 269 ldep->de_StartCluster = dirclust; 270 } 271 272 nvp->v_type = VDIR; 273 if (ldep->de_StartCluster != MSDOSFSROOT) { 274 error = pcbmap(ldep, 0xffff, 0, &size, 0); 275 if (error == E2BIG) { 276 ldep->de_FileSize = de_cn2off(pmp, size); 277 error = 0; 278 } else { 279 #ifdef MSDOSFS_DEBUG 280 printf("deget(): pcbmap returned %d\n", error); 281 #endif 282 } 283 } 284 } else 285 nvp->v_type = VREG; 286 ldep->de_modrev = init_va_filerev(); 287 *depp = ldep; 288 return (0); 289 } 290 291 int 292 deupdat(struct denode *dep, int waitfor) 293 { 294 struct direntry dir; 295 struct timespec ts; 296 struct buf *bp; 297 struct direntry *dirp; 298 int error; 299 300 if (DETOV(dep)->v_mount->mnt_flag & MNT_RDONLY) { 301 dep->de_flag &= ~(DE_UPDATE | DE_CREATE | DE_ACCESS | 302 DE_MODIFIED); 303 return (0); 304 } 305 vfs_timestamp(&ts); 306 DETIMES(dep, &ts, &ts, &ts); 307 if ((dep->de_flag & DE_MODIFIED) == 0 && waitfor == 0) 308 return (0); 309 dep->de_flag &= ~DE_MODIFIED; 310 if (DETOV(dep)->v_vflag & VV_ROOT) 311 return (EINVAL); 312 if (dep->de_refcnt <= 0) 313 return (0); 314 error = readde(dep, &bp, &dirp); 315 if (error) 316 return (error); 317 DE_EXTERNALIZE(&dir, dep); 318 if (bcmp(dirp, &dir, sizeof(dir)) == 0) { 319 if (waitfor == 0 || (bp->b_flags & B_DELWRI) == 0) { 320 brelse(bp); 321 return (0); 322 } 323 } else 324 *dirp = dir; 325 if ((DETOV(dep)->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) 326 bp->b_flags |= B_CLUSTEROK; 327 if (waitfor) 328 error = bwrite(bp); 329 else if (vm_page_count_severe() || buf_dirty_count_severe()) 330 bawrite(bp); 331 else 332 bdwrite(bp); 333 return (error); 334 } 335 336 /* 337 * Truncate the file described by dep to the length specified by length. 338 */ 339 int 340 detrunc(struct denode *dep, u_long length, int flags, struct ucred *cred) 341 { 342 int error; 343 int allerror; 344 u_long eofentry; 345 u_long chaintofree; 346 daddr_t bn; 347 int boff; 348 int isadir = dep->de_Attributes & ATTR_DIRECTORY; 349 struct buf *bp; 350 struct msdosfsmount *pmp = dep->de_pmp; 351 352 #ifdef MSDOSFS_DEBUG 353 printf("detrunc(): file %s, length %lu, flags %x\n", dep->de_Name, length, flags); 354 #endif 355 356 /* 357 * Disallow attempts to truncate the root directory since it is of 358 * fixed size. That's just the way dos filesystems are. We use 359 * the VROOT bit in the vnode because checking for the directory 360 * bit and a startcluster of 0 in the denode is not adequate to 361 * recognize the root directory at this point in a file or 362 * directory's life. 363 */ 364 if ((DETOV(dep)->v_vflag & VV_ROOT) && !FAT32(pmp)) { 365 #ifdef MSDOSFS_DEBUG 366 printf("detrunc(): can't truncate root directory, clust %ld, offset %ld\n", 367 dep->de_dirclust, dep->de_diroffset); 368 #endif 369 return (EINVAL); 370 } 371 372 if (dep->de_FileSize < length) { 373 vnode_pager_setsize(DETOV(dep), length); 374 return deextend(dep, length, cred); 375 } 376 377 /* 378 * If the desired length is 0 then remember the starting cluster of 379 * the file and set the StartCluster field in the directory entry 380 * to 0. If the desired length is not zero, then get the number of 381 * the last cluster in the shortened file. Then get the number of 382 * the first cluster in the part of the file that is to be freed. 383 * Then set the next cluster pointer in the last cluster of the 384 * file to CLUST_EOFE. 385 */ 386 if (length == 0) { 387 chaintofree = dep->de_StartCluster; 388 dep->de_StartCluster = 0; 389 eofentry = ~0; 390 } else { 391 error = pcbmap(dep, de_clcount(pmp, length) - 1, 0, 392 &eofentry, 0); 393 if (error) { 394 #ifdef MSDOSFS_DEBUG 395 printf("detrunc(): pcbmap fails %d\n", error); 396 #endif 397 return (error); 398 } 399 } 400 401 fc_purge(dep, de_clcount(pmp, length)); 402 403 /* 404 * If the new length is not a multiple of the cluster size then we 405 * must zero the tail end of the new last cluster in case it 406 * becomes part of the file again because of a seek. 407 */ 408 if ((boff = length & pmp->pm_crbomask) != 0) { 409 if (isadir) { 410 bn = cntobn(pmp, eofentry); 411 error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster, 412 NOCRED, &bp); 413 } else { 414 error = bread(DETOV(dep), de_cluster(pmp, length), 415 pmp->pm_bpcluster, cred, &bp); 416 } 417 if (error) { 418 #ifdef MSDOSFS_DEBUG 419 printf("detrunc(): bread fails %d\n", error); 420 #endif 421 return (error); 422 } 423 memset(bp->b_data + boff, 0, pmp->pm_bpcluster - boff); 424 if ((flags & IO_SYNC) != 0) 425 bwrite(bp); 426 else 427 bdwrite(bp); 428 } 429 430 /* 431 * Write out the updated directory entry. Even if the update fails 432 * we free the trailing clusters. 433 */ 434 dep->de_FileSize = length; 435 if (!isadir) 436 dep->de_flag |= DE_UPDATE | DE_MODIFIED; 437 allerror = vtruncbuf(DETOV(dep), length, pmp->pm_bpcluster); 438 #ifdef MSDOSFS_DEBUG 439 if (allerror) 440 printf("detrunc(): vtruncbuf error %d\n", allerror); 441 #endif 442 error = deupdat(dep, !DOINGASYNC((DETOV(dep)))); 443 if (error != 0 && allerror == 0) 444 allerror = error; 445 #ifdef MSDOSFS_DEBUG 446 printf("detrunc(): allerror %d, eofentry %lu\n", 447 allerror, eofentry); 448 #endif 449 450 /* 451 * If we need to break the cluster chain for the file then do it 452 * now. 453 */ 454 if (eofentry != ~0) { 455 error = fatentry(FAT_GET_AND_SET, pmp, eofentry, 456 &chaintofree, CLUST_EOFE); 457 if (error) { 458 #ifdef MSDOSFS_DEBUG 459 printf("detrunc(): fatentry errors %d\n", error); 460 #endif 461 return (error); 462 } 463 fc_setcache(dep, FC_LASTFC, de_cluster(pmp, length - 1), 464 eofentry); 465 } 466 467 /* 468 * Now free the clusters removed from the file because of the 469 * truncation. 470 */ 471 if (chaintofree != 0 && !MSDOSFSEOF(pmp, chaintofree)) 472 freeclusterchain(pmp, chaintofree); 473 474 return (allerror); 475 } 476 477 /* 478 * Extend the file described by dep to length specified by length. 479 */ 480 int 481 deextend(struct denode *dep, u_long length, struct ucred *cred) 482 { 483 struct msdosfsmount *pmp = dep->de_pmp; 484 u_long count; 485 int error; 486 487 /* 488 * The root of a DOS filesystem cannot be extended. 489 */ 490 if ((DETOV(dep)->v_vflag & VV_ROOT) && !FAT32(pmp)) 491 return (EINVAL); 492 493 /* 494 * Directories cannot be extended. 495 */ 496 if (dep->de_Attributes & ATTR_DIRECTORY) 497 return (EISDIR); 498 499 if (length <= dep->de_FileSize) 500 panic("deextend: file too large"); 501 502 /* 503 * Compute the number of clusters to allocate. 504 */ 505 count = de_clcount(pmp, length) - de_clcount(pmp, dep->de_FileSize); 506 if (count > 0) { 507 if (count > pmp->pm_freeclustercount) 508 return (ENOSPC); 509 error = extendfile(dep, count, NULL, NULL, DE_CLEAR); 510 if (error) { 511 /* truncate the added clusters away again */ 512 (void) detrunc(dep, dep->de_FileSize, 0, cred); 513 return (error); 514 } 515 } 516 dep->de_FileSize = length; 517 dep->de_flag |= DE_UPDATE | DE_MODIFIED; 518 return (deupdat(dep, !DOINGASYNC(DETOV(dep)))); 519 } 520 521 /* 522 * Move a denode to its correct hash queue after the file it represents has 523 * been moved to a new directory. 524 */ 525 void 526 reinsert(struct denode *dep) 527 { 528 struct vnode *vp; 529 530 /* 531 * Fix up the denode cache. If the denode is for a directory, 532 * there is nothing to do since the hash is based on the starting 533 * cluster of the directory file and that hasn't changed. If for a 534 * file the hash is based on the location of the directory entry, 535 * so we must remove it from the cache and re-enter it with the 536 * hash based on the new location of the directory entry. 537 */ 538 #if 0 539 if (dep->de_Attributes & ATTR_DIRECTORY) 540 return; 541 #endif 542 vp = DETOV(dep); 543 dep->de_inode = (uint64_t)dep->de_pmp->pm_bpcluster * dep->de_dirclust + 544 dep->de_diroffset; 545 vfs_hash_rehash(vp, dep->de_inode); 546 } 547 548 int 549 msdosfs_reclaim(struct vop_reclaim_args *ap) 550 { 551 struct vnode *vp = ap->a_vp; 552 struct denode *dep = VTODE(vp); 553 554 #ifdef MSDOSFS_DEBUG 555 printf("msdosfs_reclaim(): dep %p, file %s, refcnt %ld\n", 556 dep, dep->de_Name, dep->de_refcnt); 557 #endif 558 559 /* 560 * Remove the denode from its hash chain. 561 */ 562 vfs_hash_remove(vp); 563 /* 564 * Purge old data structures associated with the denode. 565 */ 566 #if 0 /* XXX */ 567 dep->de_flag = 0; 568 #endif 569 free(dep, M_MSDOSFSNODE); 570 vp->v_data = NULL; 571 572 return (0); 573 } 574 575 int 576 msdosfs_inactive(struct vop_inactive_args *ap) 577 { 578 struct vnode *vp = ap->a_vp; 579 struct denode *dep = VTODE(vp); 580 int error = 0; 581 582 #ifdef MSDOSFS_DEBUG 583 printf("msdosfs_inactive(): dep %p, de_Name[0] %x\n", dep, dep->de_Name[0]); 584 #endif 585 586 /* 587 * Ignore denodes related to stale file handles. 588 */ 589 if (dep->de_Name[0] == SLOT_DELETED || dep->de_Name[0] == SLOT_EMPTY) 590 goto out; 591 592 /* 593 * If the file has been deleted and it is on a read/write 594 * filesystem, then truncate the file, and mark the directory slot 595 * as empty. (This may not be necessary for the dos filesystem.) 596 */ 597 #ifdef MSDOSFS_DEBUG 598 printf("msdosfs_inactive(): dep %p, refcnt %ld, mntflag %llx, MNT_RDONLY %llx\n", 599 dep, dep->de_refcnt, (unsigned long long)vp->v_mount->mnt_flag, 600 (unsigned long long)MNT_RDONLY); 601 #endif 602 if (dep->de_refcnt <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 603 error = detrunc(dep, (u_long) 0, 0, NOCRED); 604 dep->de_flag |= DE_UPDATE; 605 dep->de_Name[0] = SLOT_DELETED; 606 } 607 deupdat(dep, 0); 608 609 out: 610 /* 611 * If we are done with the denode, reclaim it 612 * so that it can be reused immediately. 613 */ 614 #ifdef MSDOSFS_DEBUG 615 printf("msdosfs_inactive(): v_usecount %d, de_Name[0] %x\n", 616 vrefcnt(vp), dep->de_Name[0]); 617 #endif 618 if (dep->de_Name[0] == SLOT_DELETED || dep->de_Name[0] == SLOT_EMPTY) 619 vrecycle(vp); 620 return (error); 621 }
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