1 /* $FreeBSD$ */ 2 /* $NetBSD: msdosfs_vfsops.c,v 1.51 1997/11/17 15:36:58 ws 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/bufobj.h> 57 #include <sys/conf.h> 58 #include <sys/fcntl.h> 59 #include <sys/iconv.h> 60 #include <sys/kernel.h> 61 #include <sys/lock.h> 62 #include <sys/malloc.h> 63 #include <sys/mount.h> 64 #include <sys/mutex.h> 65 #include <sys/namei.h> 66 #include <sys/priv.h> 67 #include <sys/proc.h> 68 #include <sys/rwlock.h> 69 #include <sys/stat.h> 70 #include <sys/taskqueue.h> 71 #include <sys/vnode.h> 72 73 #include <geom/geom.h> 74 #include <geom/geom_vfs.h> 75 76 #include <fs/msdosfs/bootsect.h> 77 #include <fs/msdosfs/bpb.h> 78 #include <fs/msdosfs/direntry.h> 79 #include <fs/msdosfs/denode.h> 80 #include <fs/msdosfs/fat.h> 81 #include <fs/msdosfs/msdosfsmount.h> 82 83 #ifdef MSDOSFS_DEBUG 84 #include <sys/rwlock.h> 85 #endif 86 87 static const char msdosfs_lock_msg[] = "fatlk"; 88 89 /* Mount options that we support. */ 90 static const char *msdosfs_opts[] = { 91 "async", "noatime", "noclusterr", "noclusterw", 92 "export", "force", "from", "sync", 93 "cs_dos", "cs_local", "cs_win", "dirmask", 94 "gid", "kiconv", "longname", 95 "longnames", "mask", "shortname", "shortnames", 96 "uid", "win95", "nowin95", 97 NULL 98 }; 99 100 #if 1 /*def PC98*/ 101 /* 102 * XXX - The boot signature formatted by NEC PC-98 DOS looks like a 103 * garbage or a random value :-{ 104 * If you want to use that broken-signatured media, define the 105 * following symbol even though PC/AT. 106 * (ex. mount PC-98 DOS formatted FD on PC/AT) 107 */ 108 #define MSDOSFS_NOCHECKSIG 109 #endif 110 111 MALLOC_DEFINE(M_MSDOSFSMNT, "msdosfs_mount", "MSDOSFS mount structure"); 112 static MALLOC_DEFINE(M_MSDOSFSFAT, "msdosfs_fat", "MSDOSFS file allocation table"); 113 114 struct iconv_functions *msdosfs_iconv; 115 116 static int update_mp(struct mount *mp, struct thread *td); 117 static int mountmsdosfs(struct vnode *devvp, struct mount *mp); 118 static void msdosfs_remount_ro(void *arg, int pending); 119 static vfs_fhtovp_t msdosfs_fhtovp; 120 static vfs_mount_t msdosfs_mount; 121 static vfs_root_t msdosfs_root; 122 static vfs_statfs_t msdosfs_statfs; 123 static vfs_sync_t msdosfs_sync; 124 static vfs_unmount_t msdosfs_unmount; 125 126 /* Maximum length of a character set name (arbitrary). */ 127 #define MAXCSLEN 64 128 129 static int 130 update_mp(struct mount *mp, struct thread *td) 131 { 132 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 133 void *dos, *win, *local; 134 int error, v; 135 136 if (!vfs_getopt(mp->mnt_optnew, "kiconv", NULL, NULL)) { 137 if (msdosfs_iconv != NULL) { 138 error = vfs_getopt(mp->mnt_optnew, 139 "cs_win", &win, NULL); 140 if (!error) 141 error = vfs_getopt(mp->mnt_optnew, 142 "cs_local", &local, NULL); 143 if (!error) 144 error = vfs_getopt(mp->mnt_optnew, 145 "cs_dos", &dos, NULL); 146 if (!error) { 147 msdosfs_iconv->open(win, local, &pmp->pm_u2w); 148 msdosfs_iconv->open(local, win, &pmp->pm_w2u); 149 msdosfs_iconv->open(dos, local, &pmp->pm_u2d); 150 msdosfs_iconv->open(local, dos, &pmp->pm_d2u); 151 } 152 if (error != 0) 153 return (error); 154 } else { 155 pmp->pm_w2u = NULL; 156 pmp->pm_u2w = NULL; 157 pmp->pm_d2u = NULL; 158 pmp->pm_u2d = NULL; 159 } 160 } 161 162 if (vfs_scanopt(mp->mnt_optnew, "gid", "%d", &v) == 1) 163 pmp->pm_gid = v; 164 if (vfs_scanopt(mp->mnt_optnew, "uid", "%d", &v) == 1) 165 pmp->pm_uid = v; 166 if (vfs_scanopt(mp->mnt_optnew, "mask", "%d", &v) == 1) 167 pmp->pm_mask = v & ALLPERMS; 168 if (vfs_scanopt(mp->mnt_optnew, "dirmask", "%d", &v) == 1) 169 pmp->pm_dirmask = v & ALLPERMS; 170 vfs_flagopt(mp->mnt_optnew, "shortname", 171 &pmp->pm_flags, MSDOSFSMNT_SHORTNAME); 172 vfs_flagopt(mp->mnt_optnew, "shortnames", 173 &pmp->pm_flags, MSDOSFSMNT_SHORTNAME); 174 vfs_flagopt(mp->mnt_optnew, "longname", 175 &pmp->pm_flags, MSDOSFSMNT_LONGNAME); 176 vfs_flagopt(mp->mnt_optnew, "longnames", 177 &pmp->pm_flags, MSDOSFSMNT_LONGNAME); 178 vfs_flagopt(mp->mnt_optnew, "kiconv", 179 &pmp->pm_flags, MSDOSFSMNT_KICONV); 180 181 if (vfs_getopt(mp->mnt_optnew, "nowin95", NULL, NULL) == 0) 182 pmp->pm_flags |= MSDOSFSMNT_NOWIN95; 183 else 184 pmp->pm_flags &= ~MSDOSFSMNT_NOWIN95; 185 186 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 187 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 188 else 189 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 190 return 0; 191 } 192 193 static int 194 msdosfs_cmount(struct mntarg *ma, void *data, uint64_t flags) 195 { 196 struct msdosfs_args args; 197 int error; 198 199 if (data == NULL) 200 return (EINVAL); 201 error = copyin(data, &args, sizeof args); 202 if (error) 203 return (error); 204 205 ma = mount_argsu(ma, "from", args.fspec, MAXPATHLEN); 206 ma = mount_arg(ma, "export", &args.export, sizeof(args.export)); 207 ma = mount_argf(ma, "uid", "%d", args.uid); 208 ma = mount_argf(ma, "gid", "%d", args.gid); 209 ma = mount_argf(ma, "mask", "%d", args.mask); 210 ma = mount_argf(ma, "dirmask", "%d", args.dirmask); 211 212 ma = mount_argb(ma, args.flags & MSDOSFSMNT_SHORTNAME, "noshortname"); 213 ma = mount_argb(ma, args.flags & MSDOSFSMNT_LONGNAME, "nolongname"); 214 ma = mount_argb(ma, !(args.flags & MSDOSFSMNT_NOWIN95), "nowin95"); 215 ma = mount_argb(ma, args.flags & MSDOSFSMNT_KICONV, "nokiconv"); 216 217 ma = mount_argsu(ma, "cs_win", args.cs_win, MAXCSLEN); 218 ma = mount_argsu(ma, "cs_dos", args.cs_dos, MAXCSLEN); 219 ma = mount_argsu(ma, "cs_local", args.cs_local, MAXCSLEN); 220 221 error = kernel_mount(ma, flags); 222 223 return (error); 224 } 225 226 /* 227 * mp - path - addr in user space of mount point (ie /usr or whatever) 228 * data - addr in user space of mount params including the name of the block 229 * special file to treat as a filesystem. 230 */ 231 static int 232 msdosfs_mount(struct mount *mp) 233 { 234 struct vnode *devvp, *odevvp; /* vnode for blk device to mount */ 235 struct thread *td; 236 /* msdosfs specific mount control block */ 237 struct msdosfsmount *pmp = NULL; 238 struct nameidata ndp; 239 int error, flags; 240 accmode_t accmode; 241 char *from; 242 243 td = curthread; 244 if (vfs_filteropt(mp->mnt_optnew, msdosfs_opts)) 245 return (EINVAL); 246 247 /* 248 * If updating, check whether changing from read-only to 249 * read/write; if there is no device name, that's all we do. 250 */ 251 if (mp->mnt_flag & MNT_UPDATE) { 252 pmp = VFSTOMSDOSFS(mp); 253 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && 254 vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0)) { 255 if ((error = vn_start_write(NULL, &mp, V_WAIT)) != 0) 256 return (error); 257 error = vfs_write_suspend_umnt(mp); 258 if (error != 0) 259 return (error); 260 261 flags = WRITECLOSE; 262 if (mp->mnt_flag & MNT_FORCE) 263 flags |= FORCECLOSE; 264 error = vflush(mp, 0, flags, td); 265 if (error != 0) { 266 vfs_write_resume(mp, 0); 267 return (error); 268 } 269 270 /* 271 * Now the volume is clean. Mark it so while the 272 * device is still rw. 273 */ 274 error = markvoldirty(pmp, 0); 275 if (error != 0) { 276 vfs_write_resume(mp, 0); 277 (void)markvoldirty(pmp, 1); 278 return (error); 279 } 280 281 /* Downgrade the device from rw to ro. */ 282 g_topology_lock(); 283 error = g_access(pmp->pm_cp, 0, -1, 0); 284 g_topology_unlock(); 285 if (error) { 286 vfs_write_resume(mp, 0); 287 (void)markvoldirty(pmp, 1); 288 return (error); 289 } 290 291 /* 292 * Backing out after an error was painful in the 293 * above. Now we are committed to succeeding. 294 */ 295 pmp->pm_fmod = 0; 296 pmp->pm_flags |= MSDOSFSMNT_RONLY; 297 MNT_ILOCK(mp); 298 mp->mnt_flag |= MNT_RDONLY; 299 MNT_IUNLOCK(mp); 300 vfs_write_resume(mp, 0); 301 } else if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && 302 !vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0)) { 303 /* 304 * If upgrade to read-write by non-root, then verify 305 * that user has necessary permissions on the device. 306 */ 307 odevvp = pmp->pm_odevvp; 308 vn_lock(odevvp, LK_EXCLUSIVE | LK_RETRY); 309 error = VOP_ACCESS(odevvp, VREAD | VWRITE, 310 td->td_ucred, td); 311 if (error) 312 error = priv_check(td, PRIV_VFS_MOUNT_PERM); 313 if (error) { 314 VOP_UNLOCK(odevvp); 315 return (error); 316 } 317 VOP_UNLOCK(odevvp); 318 g_topology_lock(); 319 error = g_access(pmp->pm_cp, 0, 1, 0); 320 g_topology_unlock(); 321 if (error) 322 return (error); 323 324 /* Now that the volume is modifiable, mark it dirty. */ 325 error = markvoldirty_upgrade(pmp, true, true); 326 if (error) { 327 /* 328 * If dirtying the superblock failed, drop GEOM 329 * 'w' refs (we're still RO). 330 */ 331 g_topology_lock(); 332 (void)g_access(pmp->pm_cp, 0, -1, 0); 333 g_topology_unlock(); 334 335 return (error); 336 } 337 338 pmp->pm_fmod = 1; 339 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 340 MNT_ILOCK(mp); 341 mp->mnt_flag &= ~MNT_RDONLY; 342 MNT_IUNLOCK(mp); 343 } 344 345 /* 346 * Avoid namei() below. The "from" option is not set. 347 * Update of the devvp is pointless for this case. 348 */ 349 if ((pmp->pm_flags & MSDOSFS_ERR_RO) != 0) 350 return (0); 351 } 352 /* 353 * Not an update, or updating the name: look up the name 354 * and verify that it refers to a sensible disk device. 355 */ 356 if (vfs_getopt(mp->mnt_optnew, "from", (void **)&from, NULL)) 357 return (EINVAL); 358 NDINIT(&ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, from); 359 error = namei(&ndp); 360 if (error) 361 return (error); 362 devvp = ndp.ni_vp; 363 NDFREE_PNBUF(&ndp); 364 365 if (!vn_isdisk_error(devvp, &error)) { 366 vput(devvp); 367 return (error); 368 } 369 /* 370 * If mount by non-root, then verify that user has necessary 371 * permissions on the device. 372 */ 373 accmode = VREAD; 374 if ((mp->mnt_flag & MNT_RDONLY) == 0) 375 accmode |= VWRITE; 376 error = VOP_ACCESS(devvp, accmode, td->td_ucred, td); 377 if (error) 378 error = priv_check(td, PRIV_VFS_MOUNT_PERM); 379 if (error) { 380 vput(devvp); 381 return (error); 382 } 383 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 384 error = mountmsdosfs(devvp, mp); 385 #ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 386 pmp = VFSTOMSDOSFS(mp); 387 #endif 388 } else { 389 vput(devvp); 390 if (devvp != pmp->pm_odevvp) 391 return (EINVAL); /* XXX needs translation */ 392 } 393 if (error) { 394 vrele(devvp); 395 return (error); 396 } 397 398 error = update_mp(mp, td); 399 if (error) { 400 if ((mp->mnt_flag & MNT_UPDATE) == 0) 401 msdosfs_unmount(mp, MNT_FORCE); 402 return error; 403 } 404 405 vfs_mountedfrom(mp, from); 406 #ifdef MSDOSFS_DEBUG 407 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 408 #endif 409 return (0); 410 } 411 412 /* 413 * The FAT12 and FAT16 file systems use a limited size root directory that 414 * can be created with 1 to 65535 entries for files, directories, or a disk 415 * label (but DOS or Windows creates at most 512 root directory entries). 416 * This function calculates the number of free root directory entries by 417 * counting the non-deleted entries (not starting with 0xE5) and by adding 418 * the amount of never used entries (with the position indicated by an 419 * entry that starts with 0x00). 420 */ 421 static int 422 rootdir_free(struct msdosfsmount* pmp) 423 { 424 struct buf *bp; 425 struct direntry *dep; 426 u_long readsize; 427 int dirclu; 428 int diridx; 429 int dirmax; 430 int dirleft; 431 int ffree; 432 433 dirclu = pmp->pm_rootdirblk; 434 435 /* 436 * The msdosfs code ignores pm_RootDirEnts and uses pm_rootdirsize 437 * (measured in DEV_BSIZE) to prevent excess root dir allocations. 438 */ 439 dirleft = howmany(pmp->pm_rootdirsize * DEV_BSIZE, 440 sizeof(struct direntry)); 441 442 /* Read in chunks of default maximum root directory size */ 443 readsize = 512 * sizeof(struct direntry); 444 445 #ifdef MSDOSFS_DEBUG 446 printf("rootdir_free: blkpersec=%lu fatblksize=%lu dirsize=%lu " 447 "firstclu=%lu dirclu=%d entries=%d rootdirsize=%lu " 448 "bytespersector=%hu bytepercluster=%lu\n", 449 pmp->pm_BlkPerSec, pmp->pm_fatblocksize, readsize, 450 pmp->pm_firstcluster, dirclu, dirleft, pmp->pm_rootdirsize, 451 pmp->pm_BytesPerSec, pmp->pm_bpcluster); 452 #endif 453 ffree = dirleft; 454 while (dirleft > 0 && ffree > 0) { 455 if (readsize > dirleft * sizeof(struct direntry)) 456 readsize = dirleft * sizeof(struct direntry); 457 #ifdef MSDOSFS_DEBUG 458 printf("rootdir_free: dirclu=%d dirleft=%d readsize=%lu\n", 459 dirclu, dirleft, readsize); 460 #endif 461 if (bread(pmp->pm_devvp, dirclu, readsize, NOCRED, &bp) != 0) { 462 printf("rootdir_free: read error\n"); 463 if (bp != NULL) 464 brelse(bp); 465 return (-1); 466 } 467 dirmax = readsize / sizeof(struct direntry); 468 for (diridx = 0; diridx < dirmax && dirleft > 0; 469 diridx++, dirleft--) { 470 dep = (struct direntry*)bp->b_data + diridx; 471 #ifdef MSDOSFS_DEBUG 472 if (dep->deName[0] == SLOT_DELETED) 473 printf("rootdir_free: idx=%d <deleted>\n", 474 diridx); 475 else if (dep->deName[0] == SLOT_EMPTY) 476 printf("rootdir_free: idx=%d <end marker>\n", 477 diridx); 478 else if (dep->deAttributes == ATTR_WIN95) 479 printf("rootdir_free: idx=%d <LFN part %d>\n", 480 diridx, (dep->deName[0] & 0x1f) + 1); 481 else if (dep->deAttributes & ATTR_VOLUME) 482 printf("rootdir_free: idx=%d label='%11.11s'\n", 483 diridx, dep->deName); 484 else if (dep->deAttributes & ATTR_DIRECTORY) 485 printf("rootdir_free: idx=%d dir='%11.11s'\n", 486 diridx, dep->deName); 487 else 488 printf("rootdir_free: idx=%d file='%11.11s'\n", 489 diridx, dep->deName); 490 #endif 491 if (dep->deName[0] == SLOT_EMPTY) 492 dirleft = 0; 493 else if (dep->deName[0] != SLOT_DELETED) 494 ffree--; 495 } 496 brelse(bp); 497 bp = NULL; 498 dirclu += readsize / DEV_BSIZE; 499 } 500 return (ffree); 501 } 502 503 static int 504 mountmsdosfs(struct vnode *odevvp, struct mount *mp) 505 { 506 struct msdosfsmount *pmp; 507 struct buf *bp; 508 struct cdev *dev; 509 struct vnode *devvp; 510 union bootsector *bsp; 511 struct byte_bpb33 *b33; 512 struct byte_bpb50 *b50; 513 struct byte_bpb710 *b710; 514 uint8_t SecPerClust; 515 u_long clusters; 516 int ronly, error; 517 struct g_consumer *cp; 518 struct bufobj *bo; 519 520 bp = NULL; /* This and pmp both used in error_exit. */ 521 pmp = NULL; 522 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 523 524 devvp = mntfs_allocvp(mp, odevvp); 525 dev = devvp->v_rdev; 526 if (atomic_cmpset_acq_ptr((uintptr_t *)&dev->si_mountpt, 0, 527 (uintptr_t)mp) == 0) { 528 mntfs_freevp(devvp); 529 return (EBUSY); 530 } 531 g_topology_lock(); 532 error = g_vfs_open(devvp, &cp, "msdosfs", ronly ? 0 : 1); 533 g_topology_unlock(); 534 if (error != 0) { 535 atomic_store_rel_ptr((uintptr_t *)&dev->si_mountpt, 0); 536 mntfs_freevp(devvp); 537 return (error); 538 } 539 dev_ref(dev); 540 bo = &devvp->v_bufobj; 541 BO_LOCK(&odevvp->v_bufobj); 542 odevvp->v_bufobj.bo_flag |= BO_NOBUFS; 543 BO_UNLOCK(&odevvp->v_bufobj); 544 VOP_UNLOCK(devvp); 545 if (dev->si_iosize_max != 0) 546 mp->mnt_iosize_max = dev->si_iosize_max; 547 if (mp->mnt_iosize_max > maxphys) 548 mp->mnt_iosize_max = maxphys; 549 550 /* 551 * Read the boot sector of the filesystem, and then check the 552 * boot signature. If not a dos boot sector then error out. 553 * 554 * NOTE: 8192 is a magic size that works for ffs. 555 */ 556 error = bread(devvp, 0, 8192, NOCRED, &bp); 557 if (error) 558 goto error_exit; 559 bp->b_flags |= B_AGE; 560 bsp = (union bootsector *)bp->b_data; 561 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 562 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 563 b710 = (struct byte_bpb710 *)bsp->bs710.bsBPB; 564 565 #ifndef MSDOSFS_NOCHECKSIG 566 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 || 567 bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 568 error = EINVAL; 569 goto error_exit; 570 } 571 #endif 572 573 pmp = malloc(sizeof(*pmp), M_MSDOSFSMNT, M_WAITOK | M_ZERO); 574 pmp->pm_mountp = mp; 575 pmp->pm_cp = cp; 576 pmp->pm_bo = bo; 577 578 lockinit(&pmp->pm_fatlock, 0, msdosfs_lock_msg, 0, 0); 579 lockinit(&pmp->pm_checkpath_lock, 0, "msdoscp", 0, 0); 580 581 TASK_INIT(&pmp->pm_rw2ro_task, 0, msdosfs_remount_ro, pmp); 582 583 /* 584 * Initialize ownerships and permissions, since nothing else will 585 * initialize them iff we are mounting root. 586 */ 587 pmp->pm_uid = UID_ROOT; 588 pmp->pm_gid = GID_WHEEL; 589 pmp->pm_mask = pmp->pm_dirmask = S_IXUSR | S_IXGRP | S_IXOTH | 590 S_IRUSR | S_IRGRP | S_IROTH | S_IWUSR; 591 592 /* 593 * Compute several useful quantities from the bpb in the 594 * bootsector. Copy in the dos 5 variant of the bpb then fix up 595 * the fields that are different between dos 5 and dos 3.3. 596 */ 597 SecPerClust = b50->bpbSecPerClust; 598 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 599 if (pmp->pm_BytesPerSec < DEV_BSIZE) { 600 error = EINVAL; 601 goto error_exit; 602 } 603 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 604 pmp->pm_FATs = b50->bpbFATs; 605 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 606 pmp->pm_Sectors = getushort(b50->bpbSectors); 607 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 608 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 609 pmp->pm_Heads = getushort(b50->bpbHeads); 610 pmp->pm_Media = b50->bpbMedia; 611 612 /* calculate the ratio of sector size to DEV_BSIZE */ 613 pmp->pm_BlkPerSec = pmp->pm_BytesPerSec / DEV_BSIZE; 614 615 /* 616 * We don't check pm_Heads nor pm_SecPerTrack, because 617 * these may not be set for EFI file systems. We don't 618 * use these anyway, so we're unaffected if they are 619 * invalid. 620 */ 621 if (pmp->pm_BytesPerSec == 0 || SecPerClust == 0) { 622 error = EINVAL; 623 goto error_exit; 624 } 625 626 if (pmp->pm_Sectors == 0) { 627 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 628 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 629 } else { 630 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 631 pmp->pm_HugeSectors = pmp->pm_Sectors; 632 } 633 634 if (pmp->pm_RootDirEnts == 0) { 635 if (pmp->pm_FATsecs != 0 || getushort(b710->bpbFSVers) != 0) { 636 error = EINVAL; 637 #ifdef MSDOSFS_DEBUG 638 printf("mountmsdosfs(): bad FAT32 filesystem\n"); 639 #endif 640 goto error_exit; 641 } 642 pmp->pm_fatmask = FAT32_MASK; 643 pmp->pm_fatmult = 4; 644 pmp->pm_fatdiv = 1; 645 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 646 if ((getushort(b710->bpbExtFlags) & FATMIRROR) != 0) 647 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 648 else 649 pmp->pm_flags |= MSDOSFS_FATMIRROR; 650 } else 651 pmp->pm_flags |= MSDOSFS_FATMIRROR; 652 653 /* 654 * Check a few values (could do some more): 655 * - logical sector size: power of 2, >= block size 656 * - sectors per cluster: power of 2, >= 1 657 * - number of sectors: >= 1, <= size of partition 658 * - number of FAT sectors: >= 1 659 */ 660 if (SecPerClust == 0 || (SecPerClust & (SecPerClust - 1)) != 0 || 661 pmp->pm_BytesPerSec < DEV_BSIZE || 662 (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) != 0 || 663 pmp->pm_HugeSectors == 0 || pmp->pm_FATsecs == 0 || 664 SecPerClust * pmp->pm_BlkPerSec > MAXBSIZE / DEV_BSIZE) { 665 error = EINVAL; 666 goto error_exit; 667 } 668 669 if ((off_t)pmp->pm_HugeSectors * pmp->pm_BytesPerSec < 670 pmp->pm_HugeSectors /* overflow */ || 671 (off_t)pmp->pm_HugeSectors * pmp->pm_BytesPerSec > 672 cp->provider->mediasize /* past end of vol */) { 673 error = EINVAL; 674 goto error_exit; 675 } 676 677 pmp->pm_HugeSectors *= pmp->pm_BlkPerSec; 678 pmp->pm_HiddenSects *= pmp->pm_BlkPerSec; /* XXX not used? */ 679 pmp->pm_FATsecs *= pmp->pm_BlkPerSec; 680 SecPerClust *= pmp->pm_BlkPerSec; 681 682 pmp->pm_fatblk = pmp->pm_ResSectors * pmp->pm_BlkPerSec; 683 684 if (FAT32(pmp)) { 685 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 686 pmp->pm_firstcluster = pmp->pm_fatblk + 687 pmp->pm_FATs * pmp->pm_FATsecs; 688 pmp->pm_fsinfo = getushort(b710->bpbFSInfo) * pmp->pm_BlkPerSec; 689 } else { 690 pmp->pm_rootdirblk = pmp->pm_fatblk + 691 pmp->pm_FATs * pmp->pm_FATsecs; 692 pmp->pm_rootdirsize = howmany(pmp->pm_RootDirEnts * 693 sizeof(struct direntry), DEV_BSIZE); /* in blocks */ 694 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 695 } 696 697 if (pmp->pm_HugeSectors <= pmp->pm_firstcluster) { 698 error = EINVAL; 699 goto error_exit; 700 } 701 pmp->pm_maxcluster = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 702 SecPerClust + 1; 703 pmp->pm_fatsize = pmp->pm_FATsecs * DEV_BSIZE; /* XXX not used? */ 704 705 if (pmp->pm_fatmask == 0) { 706 if (pmp->pm_maxcluster <= ((CLUST_RSRVD - CLUST_FIRST) & 707 FAT12_MASK)) { 708 /* 709 * This will usually be a floppy disk. This size makes 710 * sure that one FAT entry will not be split across 711 * multiple blocks. 712 */ 713 pmp->pm_fatmask = FAT12_MASK; 714 pmp->pm_fatmult = 3; 715 pmp->pm_fatdiv = 2; 716 } else { 717 pmp->pm_fatmask = FAT16_MASK; 718 pmp->pm_fatmult = 2; 719 pmp->pm_fatdiv = 1; 720 } 721 } 722 723 clusters = (pmp->pm_fatsize / pmp->pm_fatmult) * pmp->pm_fatdiv; 724 if (pmp->pm_maxcluster >= clusters) { 725 #ifdef MSDOSFS_DEBUG 726 printf("Warning: number of clusters (%ld) exceeds FAT " 727 "capacity (%ld)\n", pmp->pm_maxcluster + 1, clusters); 728 #endif 729 pmp->pm_maxcluster = clusters - 1; 730 } 731 732 if (FAT12(pmp)) 733 pmp->pm_fatblocksize = 3 * 512; 734 else 735 pmp->pm_fatblocksize = PAGE_SIZE; 736 pmp->pm_fatblocksize = roundup(pmp->pm_fatblocksize, 737 pmp->pm_BytesPerSec); 738 pmp->pm_fatblocksec = pmp->pm_fatblocksize / DEV_BSIZE; 739 pmp->pm_bnshift = ffs(DEV_BSIZE) - 1; 740 741 /* 742 * Compute mask and shift value for isolating cluster relative byte 743 * offsets and cluster numbers from a file offset. 744 */ 745 pmp->pm_bpcluster = SecPerClust * DEV_BSIZE; 746 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 747 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 748 749 /* 750 * Check for valid cluster size 751 * must be a power of 2 752 */ 753 if ((pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) != 0) { 754 error = EINVAL; 755 goto error_exit; 756 } 757 758 /* 759 * Release the bootsector buffer. 760 */ 761 brelse(bp); 762 bp = NULL; 763 764 /* 765 * Check the fsinfo sector if we have one. Silently fix up our 766 * in-core copy of fp->fsinxtfree if it is unknown (0xffffffff) 767 * or too large. Ignore fp->fsinfree for now, since we need to 768 * read the entire FAT anyway to fill the inuse map. 769 */ 770 if (pmp->pm_fsinfo) { 771 struct fsinfo *fp; 772 773 if ((error = bread(devvp, pmp->pm_fsinfo, pmp->pm_BytesPerSec, 774 NOCRED, &bp)) != 0) 775 goto error_exit; 776 fp = (struct fsinfo *)bp->b_data; 777 if (!bcmp(fp->fsisig1, "RRaA", 4) && 778 !bcmp(fp->fsisig2, "rrAa", 4) && 779 !bcmp(fp->fsisig3, "\0\0\125\252", 4)) { 780 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 781 if (pmp->pm_nxtfree > pmp->pm_maxcluster) 782 pmp->pm_nxtfree = CLUST_FIRST; 783 } else 784 pmp->pm_fsinfo = 0; 785 brelse(bp); 786 bp = NULL; 787 } 788 789 /* 790 * Finish initializing pmp->pm_nxtfree (just in case the first few 791 * sectors aren't properly reserved in the FAT). This completes 792 * the fixup for fp->fsinxtfree, and fixes up the zero-initialized 793 * value if there is no fsinfo. We will use pmp->pm_nxtfree 794 * internally even if there is no fsinfo. 795 */ 796 if (pmp->pm_nxtfree < CLUST_FIRST) 797 pmp->pm_nxtfree = CLUST_FIRST; 798 799 /* 800 * Allocate memory for the bitmap of allocated clusters, and then 801 * fill it in. 802 */ 803 pmp->pm_inusemap = malloc(howmany(pmp->pm_maxcluster + 1, 804 N_INUSEBITS) * sizeof(*pmp->pm_inusemap), M_MSDOSFSFAT, M_WAITOK); 805 806 /* 807 * fillinusemap() needs pm_devvp. 808 */ 809 pmp->pm_devvp = devvp; 810 pmp->pm_odevvp = odevvp; 811 pmp->pm_dev = dev; 812 813 /* 814 * Have the inuse map filled in. 815 */ 816 MSDOSFS_LOCK_MP(pmp); 817 error = fillinusemap(pmp); 818 MSDOSFS_UNLOCK_MP(pmp); 819 if (error != 0) 820 goto error_exit; 821 822 /* 823 * If they want FAT updates to be synchronous then let them suffer 824 * the performance degradation in exchange for the on disk copy of 825 * the FAT being correct just about all the time. I suppose this 826 * would be a good thing to turn on if the kernel is still flakey. 827 */ 828 if (mp->mnt_flag & MNT_SYNCHRONOUS) 829 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 830 831 /* 832 * Finish up. 833 */ 834 if (ronly) 835 pmp->pm_flags |= MSDOSFSMNT_RONLY; 836 else { 837 if ((error = markvoldirty(pmp, 1)) != 0) 838 goto error_exit; 839 pmp->pm_fmod = 1; 840 } 841 842 if (FAT32(pmp)) { 843 pmp->pm_rootdirfree = 0; 844 } else { 845 pmp->pm_rootdirfree = rootdir_free(pmp); 846 if (pmp->pm_rootdirfree < 0) 847 goto error_exit; 848 } 849 850 mp->mnt_data = pmp; 851 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 852 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 853 MNT_ILOCK(mp); 854 mp->mnt_flag |= MNT_LOCAL; 855 mp->mnt_kern_flag |= MNTK_USES_BCACHE | MNTK_NO_IOPF; 856 MNT_IUNLOCK(mp); 857 858 return (0); 859 860 error_exit: 861 if (bp != NULL) 862 brelse(bp); 863 if (cp != NULL) { 864 g_topology_lock(); 865 g_vfs_close(cp); 866 g_topology_unlock(); 867 } 868 if (pmp != NULL) { 869 lockdestroy(&pmp->pm_fatlock); 870 lockdestroy(&pmp->pm_checkpath_lock); 871 free(pmp->pm_inusemap, M_MSDOSFSFAT); 872 free(pmp, M_MSDOSFSMNT); 873 mp->mnt_data = NULL; 874 } 875 BO_LOCK(&odevvp->v_bufobj); 876 odevvp->v_bufobj.bo_flag &= ~BO_NOBUFS; 877 BO_UNLOCK(&odevvp->v_bufobj); 878 atomic_store_rel_ptr((uintptr_t *)&dev->si_mountpt, 0); 879 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 880 mntfs_freevp(devvp); 881 dev_rel(dev); 882 return (error); 883 } 884 885 /* 886 * Unmount the filesystem described by mp. 887 */ 888 static int 889 msdosfs_unmount(struct mount *mp, int mntflags) 890 { 891 struct msdosfsmount *pmp; 892 int error, flags; 893 bool susp; 894 895 error = flags = 0; 896 pmp = VFSTOMSDOSFS(mp); 897 susp = (pmp->pm_flags & MSDOSFSMNT_RONLY) == 0; 898 899 if (susp) { 900 error = vfs_write_suspend_umnt(mp); 901 if (error != 0) 902 return (error); 903 } 904 905 if ((mntflags & MNT_FORCE) != 0) 906 flags |= FORCECLOSE; 907 error = vflush(mp, 0, flags, curthread); 908 if (error != 0 && error != ENXIO) { 909 if (susp) 910 vfs_write_resume(mp, VR_START_WRITE); 911 return (error); 912 } 913 if (susp) { 914 error = markvoldirty(pmp, 0); 915 if (error != 0 && error != ENXIO) { 916 if (susp) 917 vfs_write_resume(mp, VR_START_WRITE); 918 (void)markvoldirty(pmp, 1); 919 return (error); 920 } 921 } 922 if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) { 923 if (pmp->pm_w2u) 924 msdosfs_iconv->close(pmp->pm_w2u); 925 if (pmp->pm_u2w) 926 msdosfs_iconv->close(pmp->pm_u2w); 927 if (pmp->pm_d2u) 928 msdosfs_iconv->close(pmp->pm_d2u); 929 if (pmp->pm_u2d) 930 msdosfs_iconv->close(pmp->pm_u2d); 931 } 932 933 #ifdef MSDOSFS_DEBUG 934 { 935 struct vnode *vp = pmp->pm_devvp; 936 struct bufobj *bo; 937 938 bo = &vp->v_bufobj; 939 BO_LOCK(bo); 940 VI_LOCK(vp); 941 vn_printf(vp, 942 "msdosfs_umount(): just before calling VOP_CLOSE()\n"); 943 printf("freef %p, freeb %p, mount %p\n", 944 TAILQ_NEXT(vp, v_vnodelist), vp->v_vnodelist.tqe_prev, 945 vp->v_mount); 946 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %d, type %d\n", 947 TAILQ_FIRST(&vp->v_bufobj.bo_clean.bv_hd), 948 TAILQ_FIRST(&vp->v_bufobj.bo_dirty.bv_hd), 949 vp->v_bufobj.bo_numoutput, vp->v_type); 950 VI_UNLOCK(vp); 951 BO_UNLOCK(bo); 952 } 953 #endif 954 if (susp) 955 vfs_write_resume(mp, VR_START_WRITE); 956 957 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY); 958 g_topology_lock(); 959 g_vfs_close(pmp->pm_cp); 960 g_topology_unlock(); 961 BO_LOCK(&pmp->pm_odevvp->v_bufobj); 962 pmp->pm_odevvp->v_bufobj.bo_flag &= ~BO_NOBUFS; 963 BO_UNLOCK(&pmp->pm_odevvp->v_bufobj); 964 atomic_store_rel_ptr((uintptr_t *)&pmp->pm_dev->si_mountpt, 0); 965 mntfs_freevp(pmp->pm_devvp); 966 vrele(pmp->pm_odevvp); 967 dev_rel(pmp->pm_dev); 968 free(pmp->pm_inusemap, M_MSDOSFSFAT); 969 lockdestroy(&pmp->pm_fatlock); 970 lockdestroy(&pmp->pm_checkpath_lock); 971 free(pmp, M_MSDOSFSMNT); 972 mp->mnt_data = NULL; 973 return (error); 974 } 975 976 static void 977 msdosfs_remount_ro(void *arg, int pending) 978 { 979 struct msdosfsmount *pmp; 980 int error; 981 982 pmp = arg; 983 984 MSDOSFS_LOCK_MP(pmp); 985 if ((pmp->pm_flags & MSDOSFS_ERR_RO) != 0) { 986 while ((pmp->pm_flags & MSDOSFS_ERR_RO) != 0) 987 msleep(&pmp->pm_flags, &pmp->pm_fatlock, PVFS, 988 "msdoserrro", hz); 989 } else if ((pmp->pm_mountp->mnt_flag & MNT_RDONLY) == 0) { 990 pmp->pm_flags |= MSDOSFS_ERR_RO; 991 MSDOSFS_UNLOCK_MP(pmp); 992 printf("%s: remounting read-only due to corruption\n", 993 pmp->pm_mountp->mnt_stat.f_mntfromname); 994 error = vfs_remount_ro(pmp->pm_mountp); 995 if (error != 0) 996 printf("%s: remounting read-only failed: error %d\n", 997 pmp->pm_mountp->mnt_stat.f_mntfromname, error); 998 else 999 printf("remounted %s read-only\n", 1000 pmp->pm_mountp->mnt_stat.f_mntfromname); 1001 MSDOSFS_LOCK_MP(pmp); 1002 pmp->pm_flags &= ~MSDOSFS_ERR_RO; 1003 wakeup(&pmp->pm_flags); 1004 } 1005 MSDOSFS_UNLOCK_MP(pmp); 1006 1007 vfs_unbusy(pmp->pm_mountp); 1008 } 1009 1010 void 1011 msdosfs_integrity_error(struct msdosfsmount *pmp) 1012 { 1013 int error; 1014 1015 error = vfs_busy(pmp->pm_mountp, MBF_NOWAIT); 1016 if (error == 0) 1017 taskqueue_enqueue(taskqueue_thread, &pmp->pm_rw2ro_task); 1018 else 1019 printf("%s: integrity error busying failed, error %d\n", 1020 pmp->pm_mountp->mnt_stat.f_mntfromname, error); 1021 } 1022 1023 static int 1024 msdosfs_root(struct mount *mp, int flags, struct vnode **vpp) 1025 { 1026 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 1027 struct denode *ndep; 1028 int error; 1029 1030 #ifdef MSDOSFS_DEBUG 1031 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 1032 #endif 1033 error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, LK_EXCLUSIVE, &ndep); 1034 if (error) 1035 return (error); 1036 *vpp = DETOV(ndep); 1037 return (0); 1038 } 1039 1040 static int 1041 msdosfs_statfs(struct mount *mp, struct statfs *sbp) 1042 { 1043 struct msdosfsmount *pmp; 1044 1045 pmp = VFSTOMSDOSFS(mp); 1046 sbp->f_bsize = pmp->pm_bpcluster; 1047 sbp->f_iosize = pmp->pm_bpcluster; 1048 sbp->f_blocks = pmp->pm_maxcluster + 1; 1049 sbp->f_bfree = pmp->pm_freeclustercount; 1050 sbp->f_bavail = pmp->pm_freeclustercount; 1051 sbp->f_files = howmany(pmp->pm_rootdirsize * DEV_BSIZE, 1052 sizeof(struct direntry)); 1053 sbp->f_ffree = pmp->pm_rootdirfree; 1054 return (0); 1055 } 1056 1057 /* 1058 * If we have an FSInfo block, update it. 1059 */ 1060 static int 1061 msdosfs_fsiflush(struct msdosfsmount *pmp, int waitfor) 1062 { 1063 struct fsinfo *fp; 1064 struct buf *bp; 1065 int error; 1066 1067 MSDOSFS_LOCK_MP(pmp); 1068 if (pmp->pm_fsinfo == 0 || (pmp->pm_flags & MSDOSFS_FSIMOD) == 0) { 1069 error = 0; 1070 goto unlock; 1071 } 1072 error = bread(pmp->pm_devvp, pmp->pm_fsinfo, pmp->pm_BytesPerSec, 1073 NOCRED, &bp); 1074 if (error != 0) { 1075 goto unlock; 1076 } 1077 fp = (struct fsinfo *)bp->b_data; 1078 putulong(fp->fsinfree, pmp->pm_freeclustercount); 1079 putulong(fp->fsinxtfree, pmp->pm_nxtfree); 1080 pmp->pm_flags &= ~MSDOSFS_FSIMOD; 1081 if (waitfor == MNT_WAIT) 1082 error = bwrite(bp); 1083 else 1084 bawrite(bp); 1085 unlock: 1086 MSDOSFS_UNLOCK_MP(pmp); 1087 return (error); 1088 } 1089 1090 static int 1091 msdosfs_sync(struct mount *mp, int waitfor) 1092 { 1093 struct vnode *vp, *nvp; 1094 struct thread *td; 1095 struct denode *dep; 1096 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 1097 int error, allerror = 0; 1098 1099 td = curthread; 1100 1101 /* 1102 * If we ever switch to not updating all of the FATs all the time, 1103 * this would be the place to update them from the first one. 1104 */ 1105 if (pmp->pm_fmod != 0) { 1106 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 1107 panic("msdosfs_sync: rofs mod"); 1108 else { 1109 /* update FATs here */ 1110 } 1111 } 1112 /* 1113 * Write back each (modified) denode. 1114 */ 1115 loop: 1116 MNT_VNODE_FOREACH_ALL(vp, mp, nvp) { 1117 if (vp->v_type == VNON) { 1118 VI_UNLOCK(vp); 1119 continue; 1120 } 1121 dep = VTODE(vp); 1122 if ((dep->de_flag & 1123 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 && 1124 (vp->v_bufobj.bo_dirty.bv_cnt == 0 || 1125 waitfor == MNT_LAZY)) { 1126 VI_UNLOCK(vp); 1127 continue; 1128 } 1129 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK); 1130 if (error) { 1131 if (error == ENOENT) { 1132 MNT_VNODE_FOREACH_ALL_ABORT(mp, nvp); 1133 goto loop; 1134 } 1135 continue; 1136 } 1137 error = VOP_FSYNC(vp, waitfor, td); 1138 if (error) 1139 allerror = error; 1140 vput(vp); 1141 } 1142 1143 /* 1144 * Flush filesystem control info. 1145 */ 1146 if (waitfor != MNT_LAZY) { 1147 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY); 1148 error = VOP_FSYNC(pmp->pm_devvp, waitfor, td); 1149 if (error) 1150 allerror = error; 1151 VOP_UNLOCK(pmp->pm_devvp); 1152 } 1153 1154 error = msdosfs_fsiflush(pmp, waitfor); 1155 if (error != 0) 1156 allerror = error; 1157 1158 if (allerror == 0 && waitfor == MNT_SUSPEND) { 1159 MNT_ILOCK(mp); 1160 mp->mnt_kern_flag |= MNTK_SUSPEND2 | MNTK_SUSPENDED; 1161 MNT_IUNLOCK(mp); 1162 } 1163 return (allerror); 1164 } 1165 1166 static int 1167 msdosfs_fhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp) 1168 { 1169 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 1170 struct defid *defhp = (struct defid *) fhp; 1171 struct denode *dep; 1172 int error; 1173 1174 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, 1175 LK_EXCLUSIVE, &dep); 1176 if (error) { 1177 *vpp = NULLVP; 1178 return (error); 1179 } 1180 *vpp = DETOV(dep); 1181 vnode_create_vobject(*vpp, dep->de_FileSize, curthread); 1182 return (0); 1183 } 1184 1185 static struct vfsops msdosfs_vfsops = { 1186 .vfs_fhtovp = msdosfs_fhtovp, 1187 .vfs_mount = msdosfs_mount, 1188 .vfs_cmount = msdosfs_cmount, 1189 .vfs_root = msdosfs_root, 1190 .vfs_statfs = msdosfs_statfs, 1191 .vfs_sync = msdosfs_sync, 1192 .vfs_unmount = msdosfs_unmount, 1193 }; 1194 1195 VFS_SET(msdosfs_vfsops, msdosfs, 0); 1196 MODULE_VERSION(msdosfs, 1); 1197