1 /* $FreeBSD$ */ 2 /* $NetBSD: msdosfs_vfsops.c,v 1.51 1997/11/17 15:36:58 ws Exp $ */ 3 4 /*- 5 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. 6 * Copyright (C) 1994, 1995, 1997 TooLs GmbH. 7 * All rights reserved. 8 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by TooLs GmbH. 21 * 4. The name of TooLs GmbH may not be used to endorse or promote products 22 * derived from this software without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 27 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 29 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 30 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 31 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 32 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 33 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 /*- 36 * Written by Paul Popelka (paulp@uts.amdahl.com) 37 * 38 * You can do anything you want with this software, just don't say you wrote 39 * it, and don't remove this notice. 40 * 41 * This software is provided "as is". 42 * 43 * The author supplies this software to be publicly redistributed on the 44 * understanding that the author is not responsible for the correct 45 * functioning of this software in any circumstances and is not liable for 46 * any damages caused by this software. 47 * 48 * October 1992 49 */ 50 51 #include <sys/param.h> 52 #include <sys/systm.h> 53 #include <sys/buf.h> 54 #include <sys/conf.h> 55 #include <sys/fcntl.h> 56 #include <sys/iconv.h> 57 #include <sys/kernel.h> 58 #include <sys/lock.h> 59 #include <sys/malloc.h> 60 #include <sys/mount.h> 61 #include <sys/mutex.h> 62 #include <sys/namei.h> 63 #include <sys/priv.h> 64 #include <sys/proc.h> 65 #include <sys/stat.h> 66 #include <sys/vnode.h> 67 68 #include <geom/geom.h> 69 #include <geom/geom_vfs.h> 70 71 #include <fs/msdosfs/bootsect.h> 72 #include <fs/msdosfs/bpb.h> 73 #include <fs/msdosfs/direntry.h> 74 #include <fs/msdosfs/denode.h> 75 #include <fs/msdosfs/fat.h> 76 #include <fs/msdosfs/msdosfsmount.h> 77 78 static const char msdosfs_lock_msg[] = "fatlk"; 79 80 /* Mount options that we support. */ 81 static const char *msdosfs_opts[] = { 82 "async", "noatime", "noclusterr", "noclusterw", 83 "export", "force", "from", "sync", 84 "cs_dos", "cs_local", "cs_win", "dirmask", 85 "gid", "kiconv", "large", "longname", 86 "longnames", "mask", "shortname", "shortnames", 87 "uid", "win95", "nowin95", 88 NULL 89 }; 90 91 #if 1 /*def PC98*/ 92 /* 93 * XXX - The boot signature formatted by NEC PC-98 DOS looks like a 94 * garbage or a random value :-{ 95 * If you want to use that broken-signatured media, define the 96 * following symbol even though PC/AT. 97 * (ex. mount PC-98 DOS formatted FD on PC/AT) 98 */ 99 #define MSDOSFS_NOCHECKSIG 100 #endif 101 102 MALLOC_DEFINE(M_MSDOSFSMNT, "msdosfs_mount", "MSDOSFS mount structure"); 103 static MALLOC_DEFINE(M_MSDOSFSFAT, "msdosfs_fat", "MSDOSFS file allocation table"); 104 105 struct iconv_functions *msdosfs_iconv; 106 107 static int update_mp(struct mount *mp, struct thread *td); 108 static int mountmsdosfs(struct vnode *devvp, struct mount *mp); 109 static vfs_fhtovp_t msdosfs_fhtovp; 110 static vfs_mount_t msdosfs_mount; 111 static vfs_root_t msdosfs_root; 112 static vfs_statfs_t msdosfs_statfs; 113 static vfs_sync_t msdosfs_sync; 114 static vfs_unmount_t msdosfs_unmount; 115 116 /* Maximum length of a character set name (arbitrary). */ 117 #define MAXCSLEN 64 118 119 static int 120 update_mp(struct mount *mp, struct thread *td) 121 { 122 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 123 void *dos, *win, *local; 124 int error, v; 125 126 if (!vfs_getopt(mp->mnt_optnew, "kiconv", NULL, NULL)) { 127 if (msdosfs_iconv != NULL) { 128 error = vfs_getopt(mp->mnt_optnew, 129 "cs_win", &win, NULL); 130 if (!error) 131 error = vfs_getopt(mp->mnt_optnew, 132 "cs_local", &local, NULL); 133 if (!error) 134 error = vfs_getopt(mp->mnt_optnew, 135 "cs_dos", &dos, NULL); 136 if (!error) { 137 msdosfs_iconv->open(win, local, &pmp->pm_u2w); 138 msdosfs_iconv->open(local, win, &pmp->pm_w2u); 139 msdosfs_iconv->open(dos, local, &pmp->pm_u2d); 140 msdosfs_iconv->open(local, dos, &pmp->pm_d2u); 141 } 142 if (error != 0) 143 return (error); 144 } else { 145 pmp->pm_w2u = NULL; 146 pmp->pm_u2w = NULL; 147 pmp->pm_d2u = NULL; 148 pmp->pm_u2d = NULL; 149 } 150 } 151 152 if (1 == vfs_scanopt(mp->mnt_optnew, "gid", "%d", &v)) 153 pmp->pm_gid = v; 154 if (1 == vfs_scanopt(mp->mnt_optnew, "uid", "%d", &v)) 155 pmp->pm_uid = v; 156 if (1 == vfs_scanopt(mp->mnt_optnew, "mask", "%d", &v)) 157 pmp->pm_mask = v & ALLPERMS; 158 if (1 == vfs_scanopt(mp->mnt_optnew, "dirmask", "%d", &v)) 159 pmp->pm_dirmask = v & ALLPERMS; 160 vfs_flagopt(mp->mnt_optnew, "shortname", 161 &pmp->pm_flags, MSDOSFSMNT_SHORTNAME); 162 vfs_flagopt(mp->mnt_optnew, "shortnames", 163 &pmp->pm_flags, MSDOSFSMNT_SHORTNAME); 164 vfs_flagopt(mp->mnt_optnew, "longname", 165 &pmp->pm_flags, MSDOSFSMNT_LONGNAME); 166 vfs_flagopt(mp->mnt_optnew, "longnames", 167 &pmp->pm_flags, MSDOSFSMNT_LONGNAME); 168 vfs_flagopt(mp->mnt_optnew, "kiconv", 169 &pmp->pm_flags, MSDOSFSMNT_KICONV); 170 171 if (vfs_getopt(mp->mnt_optnew, "nowin95", NULL, NULL) == 0) 172 pmp->pm_flags |= MSDOSFSMNT_NOWIN95; 173 else 174 pmp->pm_flags &= ~MSDOSFSMNT_NOWIN95; 175 176 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 177 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 178 else if (!(pmp->pm_flags & 179 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 180 struct vnode *rootvp; 181 182 /* 183 * Try to divine whether to support Win'95 long filenames 184 */ 185 if (FAT32(pmp)) 186 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 187 else { 188 if ((error = 189 msdosfs_root(mp, LK_EXCLUSIVE, &rootvp)) != 0) 190 return error; 191 pmp->pm_flags |= findwin95(VTODE(rootvp)) ? 192 MSDOSFSMNT_LONGNAME : MSDOSFSMNT_SHORTNAME; 193 vput(rootvp); 194 } 195 } 196 return 0; 197 } 198 199 static int 200 msdosfs_cmount(struct mntarg *ma, void *data, int flags) 201 { 202 struct msdosfs_args args; 203 int error; 204 205 if (data == NULL) 206 return (EINVAL); 207 error = copyin(data, &args, sizeof args); 208 if (error) 209 return (error); 210 211 ma = mount_argsu(ma, "from", args.fspec, MAXPATHLEN); 212 ma = mount_arg(ma, "export", &args.export, sizeof args.export); 213 ma = mount_argf(ma, "uid", "%d", args.uid); 214 ma = mount_argf(ma, "gid", "%d", args.gid); 215 ma = mount_argf(ma, "mask", "%d", args.mask); 216 ma = mount_argf(ma, "dirmask", "%d", args.dirmask); 217 218 ma = mount_argb(ma, args.flags & MSDOSFSMNT_SHORTNAME, "noshortname"); 219 ma = mount_argb(ma, args.flags & MSDOSFSMNT_LONGNAME, "nolongname"); 220 ma = mount_argb(ma, !(args.flags & MSDOSFSMNT_NOWIN95), "nowin95"); 221 ma = mount_argb(ma, args.flags & MSDOSFSMNT_KICONV, "nokiconv"); 222 223 ma = mount_argsu(ma, "cs_win", args.cs_win, MAXCSLEN); 224 ma = mount_argsu(ma, "cs_dos", args.cs_dos, MAXCSLEN); 225 ma = mount_argsu(ma, "cs_local", args.cs_local, MAXCSLEN); 226 227 error = kernel_mount(ma, flags); 228 229 return (error); 230 } 231 232 /* 233 * mp - path - addr in user space of mount point (ie /usr or whatever) 234 * data - addr in user space of mount params including the name of the block 235 * special file to treat as a filesystem. 236 */ 237 static int 238 msdosfs_mount(struct mount *mp) 239 { 240 struct vnode *devvp; /* vnode for blk device to mount */ 241 struct thread *td; 242 /* msdosfs specific mount control block */ 243 struct msdosfsmount *pmp = NULL; 244 struct nameidata ndp; 245 int error, flags; 246 accmode_t accmode; 247 char *from; 248 249 td = curthread; 250 if (vfs_filteropt(mp->mnt_optnew, msdosfs_opts)) 251 return (EINVAL); 252 253 /* 254 * If updating, check whether changing from read-only to 255 * read/write; if there is no device name, that's all we do. 256 */ 257 if (mp->mnt_flag & MNT_UPDATE) { 258 pmp = VFSTOMSDOSFS(mp); 259 if (vfs_flagopt(mp->mnt_optnew, "export", NULL, 0)) { 260 /* 261 * Forbid export requests if filesystem has 262 * MSDOSFS_LARGEFS flag set. 263 */ 264 if ((pmp->pm_flags & MSDOSFS_LARGEFS) != 0) { 265 vfs_mount_error(mp, 266 "MSDOSFS_LARGEFS flag set, cannot export"); 267 return (EOPNOTSUPP); 268 } 269 } 270 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && 271 vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0)) { 272 error = VFS_SYNC(mp, MNT_WAIT); 273 if (error) 274 return (error); 275 flags = WRITECLOSE; 276 if (mp->mnt_flag & MNT_FORCE) 277 flags |= FORCECLOSE; 278 error = vflush(mp, 0, flags, td); 279 if (error) 280 return (error); 281 282 /* 283 * Now the volume is clean. Mark it so while the 284 * device is still rw. 285 */ 286 error = markvoldirty(pmp, 0); 287 if (error) { 288 (void)markvoldirty(pmp, 1); 289 return (error); 290 } 291 292 /* Downgrade the device from rw to ro. */ 293 DROP_GIANT(); 294 g_topology_lock(); 295 error = g_access(pmp->pm_cp, 0, -1, 0); 296 g_topology_unlock(); 297 PICKUP_GIANT(); 298 if (error) { 299 (void)markvoldirty(pmp, 1); 300 return (error); 301 } 302 303 /* 304 * Backing out after an error was painful in the 305 * above. Now we are committed to succeeding. 306 */ 307 pmp->pm_fmod = 0; 308 pmp->pm_flags |= MSDOSFSMNT_RONLY; 309 MNT_ILOCK(mp); 310 mp->mnt_flag |= MNT_RDONLY; 311 MNT_IUNLOCK(mp); 312 } else if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && 313 !vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0)) { 314 /* 315 * If upgrade to read-write by non-root, then verify 316 * that user has necessary permissions on the device. 317 */ 318 devvp = pmp->pm_devvp; 319 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 320 error = VOP_ACCESS(devvp, VREAD | VWRITE, 321 td->td_ucred, td); 322 if (error) 323 error = priv_check(td, PRIV_VFS_MOUNT_PERM); 324 if (error) { 325 VOP_UNLOCK(devvp, 0); 326 return (error); 327 } 328 VOP_UNLOCK(devvp, 0); 329 DROP_GIANT(); 330 g_topology_lock(); 331 error = g_access(pmp->pm_cp, 0, 1, 0); 332 g_topology_unlock(); 333 PICKUP_GIANT(); 334 if (error) 335 return (error); 336 337 pmp->pm_fmod = 1; 338 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 339 MNT_ILOCK(mp); 340 mp->mnt_flag &= ~MNT_RDONLY; 341 MNT_IUNLOCK(mp); 342 343 /* Now that the volume is modifiable, mark it dirty. */ 344 error = markvoldirty(pmp, 1); 345 if (error) 346 return (error); 347 } 348 } 349 /* 350 * Not an update, or updating the name: look up the name 351 * and verify that it refers to a sensible disk device. 352 */ 353 if (vfs_getopt(mp->mnt_optnew, "from", (void **)&from, NULL)) 354 return (EINVAL); 355 NDINIT(&ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, from, td); 356 error = namei(&ndp); 357 if (error) 358 return (error); 359 devvp = ndp.ni_vp; 360 NDFREE(&ndp, NDF_ONLY_PNBUF); 361 362 if (!vn_isdisk(devvp, &error)) { 363 vput(devvp); 364 return (error); 365 } 366 /* 367 * If mount by non-root, then verify that user has necessary 368 * permissions on the device. 369 */ 370 accmode = VREAD; 371 if ((mp->mnt_flag & MNT_RDONLY) == 0) 372 accmode |= VWRITE; 373 error = VOP_ACCESS(devvp, accmode, td->td_ucred, td); 374 if (error) 375 error = priv_check(td, PRIV_VFS_MOUNT_PERM); 376 if (error) { 377 vput(devvp); 378 return (error); 379 } 380 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 381 error = mountmsdosfs(devvp, mp); 382 #ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 383 pmp = VFSTOMSDOSFS(mp); 384 #endif 385 } else { 386 vput(devvp); 387 if (devvp != pmp->pm_devvp) 388 return (EINVAL); /* XXX needs translation */ 389 } 390 if (error) { 391 vrele(devvp); 392 return (error); 393 } 394 395 error = update_mp(mp, td); 396 if (error) { 397 if ((mp->mnt_flag & MNT_UPDATE) == 0) 398 msdosfs_unmount(mp, MNT_FORCE); 399 return error; 400 } 401 402 vfs_mountedfrom(mp, from); 403 #ifdef MSDOSFS_DEBUG 404 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 405 #endif 406 return (0); 407 } 408 409 static int 410 mountmsdosfs(struct vnode *devvp, struct mount *mp) 411 { 412 struct msdosfsmount *pmp; 413 struct buf *bp; 414 struct cdev *dev; 415 union bootsector *bsp; 416 struct byte_bpb33 *b33; 417 struct byte_bpb50 *b50; 418 struct byte_bpb710 *b710; 419 u_int8_t SecPerClust; 420 u_long clusters; 421 int ronly, error; 422 struct g_consumer *cp; 423 struct bufobj *bo; 424 425 bp = NULL; /* This and pmp both used in error_exit. */ 426 pmp = NULL; 427 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 428 429 dev = devvp->v_rdev; 430 dev_ref(dev); 431 DROP_GIANT(); 432 g_topology_lock(); 433 error = g_vfs_open(devvp, &cp, "msdosfs", ronly ? 0 : 1); 434 g_topology_unlock(); 435 PICKUP_GIANT(); 436 VOP_UNLOCK(devvp, 0); 437 if (error) 438 goto error_exit; 439 440 bo = &devvp->v_bufobj; 441 442 /* 443 * Read the boot sector of the filesystem, and then check the 444 * boot signature. If not a dos boot sector then error out. 445 * 446 * NOTE: 8192 is a magic size that works for ffs. 447 */ 448 error = bread(devvp, 0, 8192, NOCRED, &bp); 449 if (error) 450 goto error_exit; 451 bp->b_flags |= B_AGE; 452 bsp = (union bootsector *)bp->b_data; 453 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 454 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 455 b710 = (struct byte_bpb710 *)bsp->bs710.bsBPB; 456 457 #ifndef MSDOSFS_NOCHECKSIG 458 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 459 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 460 error = EINVAL; 461 goto error_exit; 462 } 463 #endif 464 465 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK | M_ZERO); 466 pmp->pm_mountp = mp; 467 pmp->pm_cp = cp; 468 pmp->pm_bo = bo; 469 470 lockinit(&pmp->pm_fatlock, 0, msdosfs_lock_msg, 0, 0); 471 472 /* 473 * Initialize ownerships and permissions, since nothing else will 474 * initialize them iff we are mounting root. 475 */ 476 pmp->pm_uid = UID_ROOT; 477 pmp->pm_gid = GID_WHEEL; 478 pmp->pm_mask = pmp->pm_dirmask = S_IXUSR | S_IXGRP | S_IXOTH | 479 S_IRUSR | S_IRGRP | S_IROTH | S_IWUSR; 480 481 /* 482 * Experimental support for large MS-DOS filesystems. 483 * WARNING: This uses at least 32 bytes of kernel memory (which is not 484 * reclaimed until the FS is unmounted) for each file on disk to map 485 * between the 32-bit inode numbers used by VFS and the 64-bit 486 * pseudo-inode numbers used internally by msdosfs. This is only 487 * safe to use in certain controlled situations (e.g. read-only FS 488 * with less than 1 million files). 489 * Since the mappings do not persist across unmounts (or reboots), these 490 * filesystems are not suitable for exporting through NFS, or any other 491 * application that requires fixed inode numbers. 492 */ 493 vfs_flagopt(mp->mnt_optnew, "large", &pmp->pm_flags, MSDOSFS_LARGEFS); 494 495 /* 496 * Compute several useful quantities from the bpb in the 497 * bootsector. Copy in the dos 5 variant of the bpb then fix up 498 * the fields that are different between dos 5 and dos 3.3. 499 */ 500 SecPerClust = b50->bpbSecPerClust; 501 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 502 if (pmp->pm_BytesPerSec < DEV_BSIZE) { 503 error = EINVAL; 504 goto error_exit; 505 } 506 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 507 pmp->pm_FATs = b50->bpbFATs; 508 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 509 pmp->pm_Sectors = getushort(b50->bpbSectors); 510 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 511 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 512 pmp->pm_Heads = getushort(b50->bpbHeads); 513 pmp->pm_Media = b50->bpbMedia; 514 515 /* calculate the ratio of sector size to DEV_BSIZE */ 516 pmp->pm_BlkPerSec = pmp->pm_BytesPerSec / DEV_BSIZE; 517 518 /* 519 * We don't check pm_Heads nor pm_SecPerTrack, because 520 * these may not be set for EFI file systems. We don't 521 * use these anyway, so we're unaffected if they are 522 * invalid. 523 */ 524 if (!pmp->pm_BytesPerSec || !SecPerClust) { 525 error = EINVAL; 526 goto error_exit; 527 } 528 529 if (pmp->pm_Sectors == 0) { 530 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 531 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 532 } else { 533 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 534 pmp->pm_HugeSectors = pmp->pm_Sectors; 535 } 536 if (!(pmp->pm_flags & MSDOSFS_LARGEFS)) { 537 if (pmp->pm_HugeSectors > 0xffffffff / 538 (pmp->pm_BytesPerSec / sizeof(struct direntry)) + 1) { 539 /* 540 * We cannot deal currently with this size of disk 541 * due to fileid limitations (see msdosfs_getattr and 542 * msdosfs_readdir) 543 */ 544 error = EINVAL; 545 vfs_mount_error(mp, 546 "Disk too big, try '-o large' mount option"); 547 goto error_exit; 548 } 549 } 550 551 if (pmp->pm_RootDirEnts == 0) { 552 if (pmp->pm_Sectors 553 || pmp->pm_FATsecs 554 || getushort(b710->bpbFSVers)) { 555 error = EINVAL; 556 printf("mountmsdosfs(): bad FAT32 filesystem\n"); 557 goto error_exit; 558 } 559 pmp->pm_fatmask = FAT32_MASK; 560 pmp->pm_fatmult = 4; 561 pmp->pm_fatdiv = 1; 562 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 563 if (getushort(b710->bpbExtFlags) & FATMIRROR) 564 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 565 else 566 pmp->pm_flags |= MSDOSFS_FATMIRROR; 567 } else 568 pmp->pm_flags |= MSDOSFS_FATMIRROR; 569 570 /* 571 * Check a few values (could do some more): 572 * - logical sector size: power of 2, >= block size 573 * - sectors per cluster: power of 2, >= 1 574 * - number of sectors: >= 1, <= size of partition 575 * - number of FAT sectors: >= 1 576 */ 577 if ( (SecPerClust == 0) 578 || (SecPerClust & (SecPerClust - 1)) 579 || (pmp->pm_BytesPerSec < DEV_BSIZE) 580 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 581 || (pmp->pm_HugeSectors == 0) 582 || (pmp->pm_FATsecs == 0) 583 ) { 584 error = EINVAL; 585 goto error_exit; 586 } 587 588 pmp->pm_HugeSectors *= pmp->pm_BlkPerSec; 589 pmp->pm_HiddenSects *= pmp->pm_BlkPerSec; /* XXX not used? */ 590 pmp->pm_FATsecs *= pmp->pm_BlkPerSec; 591 SecPerClust *= pmp->pm_BlkPerSec; 592 593 pmp->pm_fatblk = pmp->pm_ResSectors * pmp->pm_BlkPerSec; 594 595 if (FAT32(pmp)) { 596 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 597 pmp->pm_firstcluster = pmp->pm_fatblk 598 + (pmp->pm_FATs * pmp->pm_FATsecs); 599 pmp->pm_fsinfo = getushort(b710->bpbFSInfo) * pmp->pm_BlkPerSec; 600 } else { 601 pmp->pm_rootdirblk = pmp->pm_fatblk + 602 (pmp->pm_FATs * pmp->pm_FATsecs); 603 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 604 + DEV_BSIZE - 1) 605 / DEV_BSIZE; /* in blocks */ 606 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 607 } 608 609 pmp->pm_maxcluster = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 610 SecPerClust + 1; 611 pmp->pm_fatsize = pmp->pm_FATsecs * DEV_BSIZE; /* XXX not used? */ 612 613 if (pmp->pm_fatmask == 0) { 614 if (pmp->pm_maxcluster 615 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 616 /* 617 * This will usually be a floppy disk. This size makes 618 * sure that one fat entry will not be split across 619 * multiple blocks. 620 */ 621 pmp->pm_fatmask = FAT12_MASK; 622 pmp->pm_fatmult = 3; 623 pmp->pm_fatdiv = 2; 624 } else { 625 pmp->pm_fatmask = FAT16_MASK; 626 pmp->pm_fatmult = 2; 627 pmp->pm_fatdiv = 1; 628 } 629 } 630 631 clusters = (pmp->pm_fatsize / pmp->pm_fatmult) * pmp->pm_fatdiv; 632 if (pmp->pm_maxcluster >= clusters) { 633 printf("Warning: number of clusters (%ld) exceeds FAT " 634 "capacity (%ld)\n", pmp->pm_maxcluster + 1, clusters); 635 pmp->pm_maxcluster = clusters - 1; 636 } 637 638 if (FAT12(pmp)) 639 pmp->pm_fatblocksize = 3 * 512; 640 else 641 pmp->pm_fatblocksize = PAGE_SIZE; 642 pmp->pm_fatblocksize = roundup(pmp->pm_fatblocksize, 643 pmp->pm_BytesPerSec); 644 pmp->pm_fatblocksec = pmp->pm_fatblocksize / DEV_BSIZE; 645 pmp->pm_bnshift = ffs(DEV_BSIZE) - 1; 646 647 /* 648 * Compute mask and shift value for isolating cluster relative byte 649 * offsets and cluster numbers from a file offset. 650 */ 651 pmp->pm_bpcluster = SecPerClust * DEV_BSIZE; 652 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 653 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 654 655 /* 656 * Check for valid cluster size 657 * must be a power of 2 658 */ 659 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 660 error = EINVAL; 661 goto error_exit; 662 } 663 664 /* 665 * Release the bootsector buffer. 666 */ 667 brelse(bp); 668 bp = NULL; 669 670 /* 671 * Check the fsinfo sector if we have one. Silently fix up our 672 * in-core copy of fp->fsinxtfree if it is unknown (0xffffffff) 673 * or too large. Ignore fp->fsinfree for now, since we need to 674 * read the entire FAT anyway to fill the inuse map. 675 */ 676 if (pmp->pm_fsinfo) { 677 struct fsinfo *fp; 678 679 if ((error = bread(devvp, pmp->pm_fsinfo, pmp->pm_BytesPerSec, 680 NOCRED, &bp)) != 0) 681 goto error_exit; 682 fp = (struct fsinfo *)bp->b_data; 683 if (!bcmp(fp->fsisig1, "RRaA", 4) 684 && !bcmp(fp->fsisig2, "rrAa", 4) 685 && !bcmp(fp->fsisig3, "\0\0\125\252", 4)) { 686 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 687 if (pmp->pm_nxtfree > pmp->pm_maxcluster) 688 pmp->pm_nxtfree = CLUST_FIRST; 689 } else 690 pmp->pm_fsinfo = 0; 691 brelse(bp); 692 bp = NULL; 693 } 694 695 /* 696 * Finish initializing pmp->pm_nxtfree (just in case the first few 697 * sectors aren't properly reserved in the FAT). This completes 698 * the fixup for fp->fsinxtfree, and fixes up the zero-initialized 699 * value if there is no fsinfo. We will use pmp->pm_nxtfree 700 * internally even if there is no fsinfo. 701 */ 702 if (pmp->pm_nxtfree < CLUST_FIRST) 703 pmp->pm_nxtfree = CLUST_FIRST; 704 705 /* 706 * Allocate memory for the bitmap of allocated clusters, and then 707 * fill it in. 708 */ 709 pmp->pm_inusemap = malloc(howmany(pmp->pm_maxcluster + 1, N_INUSEBITS) 710 * sizeof(*pmp->pm_inusemap), 711 M_MSDOSFSFAT, M_WAITOK); 712 713 /* 714 * fillinusemap() needs pm_devvp. 715 */ 716 pmp->pm_devvp = devvp; 717 pmp->pm_dev = dev; 718 719 /* 720 * Have the inuse map filled in. 721 */ 722 MSDOSFS_LOCK_MP(pmp); 723 error = fillinusemap(pmp); 724 MSDOSFS_UNLOCK_MP(pmp); 725 if (error != 0) 726 goto error_exit; 727 728 /* 729 * If they want fat updates to be synchronous then let them suffer 730 * the performance degradation in exchange for the on disk copy of 731 * the fat being correct just about all the time. I suppose this 732 * would be a good thing to turn on if the kernel is still flakey. 733 */ 734 if (mp->mnt_flag & MNT_SYNCHRONOUS) 735 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 736 737 /* 738 * Finish up. 739 */ 740 if (ronly) 741 pmp->pm_flags |= MSDOSFSMNT_RONLY; 742 else { 743 if ((error = markvoldirty(pmp, 1)) != 0) { 744 (void)markvoldirty(pmp, 0); 745 goto error_exit; 746 } 747 pmp->pm_fmod = 1; 748 } 749 mp->mnt_data = pmp; 750 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 751 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 752 MNT_ILOCK(mp); 753 mp->mnt_flag |= MNT_LOCAL; 754 mp->mnt_kern_flag |= MNTK_MPSAFE; 755 MNT_IUNLOCK(mp); 756 757 if (pmp->pm_flags & MSDOSFS_LARGEFS) 758 msdosfs_fileno_init(mp); 759 760 return 0; 761 762 error_exit: 763 if (bp) 764 brelse(bp); 765 if (cp != NULL) { 766 DROP_GIANT(); 767 g_topology_lock(); 768 g_vfs_close(cp); 769 g_topology_unlock(); 770 PICKUP_GIANT(); 771 } 772 if (pmp) { 773 lockdestroy(&pmp->pm_fatlock); 774 if (pmp->pm_inusemap) 775 free(pmp->pm_inusemap, M_MSDOSFSFAT); 776 free(pmp, M_MSDOSFSMNT); 777 mp->mnt_data = NULL; 778 } 779 dev_rel(dev); 780 return (error); 781 } 782 783 /* 784 * Unmount the filesystem described by mp. 785 */ 786 static int 787 msdosfs_unmount(struct mount *mp, int mntflags) 788 { 789 struct msdosfsmount *pmp; 790 int error, flags; 791 792 flags = 0; 793 if (mntflags & MNT_FORCE) 794 flags |= FORCECLOSE; 795 error = vflush(mp, 0, flags, curthread); 796 if (error && error != ENXIO) 797 return error; 798 pmp = VFSTOMSDOSFS(mp); 799 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) == 0) { 800 error = markvoldirty(pmp, 0); 801 if (error && error != ENXIO) { 802 (void)markvoldirty(pmp, 1); 803 return (error); 804 } 805 } 806 if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) { 807 if (pmp->pm_w2u) 808 msdosfs_iconv->close(pmp->pm_w2u); 809 if (pmp->pm_u2w) 810 msdosfs_iconv->close(pmp->pm_u2w); 811 if (pmp->pm_d2u) 812 msdosfs_iconv->close(pmp->pm_d2u); 813 if (pmp->pm_u2d) 814 msdosfs_iconv->close(pmp->pm_u2d); 815 } 816 817 #ifdef MSDOSFS_DEBUG 818 { 819 struct vnode *vp = pmp->pm_devvp; 820 struct bufobj *bo; 821 822 bo = &vp->v_bufobj; 823 BO_LOCK(bo); 824 VI_LOCK(vp); 825 vn_printf(vp, 826 "msdosfs_umount(): just before calling VOP_CLOSE()\n"); 827 printf("freef %p, freeb %p, mount %p\n", 828 TAILQ_NEXT(vp, v_freelist), vp->v_freelist.tqe_prev, 829 vp->v_mount); 830 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %ld, type %d\n", 831 TAILQ_FIRST(&vp->v_bufobj.bo_clean.bv_hd), 832 TAILQ_FIRST(&vp->v_bufobj.bo_dirty.bv_hd), 833 vp->v_bufobj.bo_numoutput, vp->v_type); 834 VI_UNLOCK(vp); 835 BO_UNLOCK(bo); 836 } 837 #endif 838 DROP_GIANT(); 839 g_topology_lock(); 840 g_vfs_close(pmp->pm_cp); 841 g_topology_unlock(); 842 PICKUP_GIANT(); 843 vrele(pmp->pm_devvp); 844 dev_rel(pmp->pm_dev); 845 free(pmp->pm_inusemap, M_MSDOSFSFAT); 846 if (pmp->pm_flags & MSDOSFS_LARGEFS) 847 msdosfs_fileno_free(mp); 848 lockdestroy(&pmp->pm_fatlock); 849 free(pmp, M_MSDOSFSMNT); 850 mp->mnt_data = NULL; 851 MNT_ILOCK(mp); 852 mp->mnt_flag &= ~MNT_LOCAL; 853 MNT_IUNLOCK(mp); 854 return (error); 855 } 856 857 static int 858 msdosfs_root(struct mount *mp, int flags, struct vnode **vpp) 859 { 860 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 861 struct denode *ndep; 862 int error; 863 864 #ifdef MSDOSFS_DEBUG 865 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 866 #endif 867 error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep); 868 if (error) 869 return (error); 870 *vpp = DETOV(ndep); 871 return (0); 872 } 873 874 static int 875 msdosfs_statfs(struct mount *mp, struct statfs *sbp) 876 { 877 struct msdosfsmount *pmp; 878 879 pmp = VFSTOMSDOSFS(mp); 880 sbp->f_bsize = pmp->pm_bpcluster; 881 sbp->f_iosize = pmp->pm_bpcluster; 882 sbp->f_blocks = pmp->pm_maxcluster + 1; 883 sbp->f_bfree = pmp->pm_freeclustercount; 884 sbp->f_bavail = pmp->pm_freeclustercount; 885 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 886 sbp->f_ffree = 0; /* what to put in here? */ 887 return (0); 888 } 889 890 static int 891 msdosfs_sync(struct mount *mp, int waitfor) 892 { 893 struct vnode *vp, *nvp; 894 struct thread *td; 895 struct denode *dep; 896 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 897 int error, allerror = 0; 898 899 td = curthread; 900 901 /* 902 * If we ever switch to not updating all of the fats all the time, 903 * this would be the place to update them from the first one. 904 */ 905 if (pmp->pm_fmod != 0) { 906 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 907 panic("msdosfs_sync: rofs mod"); 908 else { 909 /* update fats here */ 910 } 911 } 912 /* 913 * Write back each (modified) denode. 914 */ 915 MNT_ILOCK(mp); 916 loop: 917 MNT_VNODE_FOREACH(vp, mp, nvp) { 918 VI_LOCK(vp); 919 if (vp->v_type == VNON || (vp->v_iflag & VI_DOOMED)) { 920 VI_UNLOCK(vp); 921 continue; 922 } 923 MNT_IUNLOCK(mp); 924 dep = VTODE(vp); 925 if ((dep->de_flag & 926 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 && 927 (vp->v_bufobj.bo_dirty.bv_cnt == 0 || 928 waitfor == MNT_LAZY)) { 929 VI_UNLOCK(vp); 930 MNT_ILOCK(mp); 931 continue; 932 } 933 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td); 934 if (error) { 935 MNT_ILOCK(mp); 936 if (error == ENOENT) 937 goto loop; 938 continue; 939 } 940 error = VOP_FSYNC(vp, waitfor, td); 941 if (error) 942 allerror = error; 943 VOP_UNLOCK(vp, 0); 944 vrele(vp); 945 MNT_ILOCK(mp); 946 } 947 MNT_IUNLOCK(mp); 948 949 /* 950 * Flush filesystem control info. 951 */ 952 if (waitfor != MNT_LAZY) { 953 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY); 954 error = VOP_FSYNC(pmp->pm_devvp, waitfor, td); 955 if (error) 956 allerror = error; 957 VOP_UNLOCK(pmp->pm_devvp, 0); 958 } 959 return (allerror); 960 } 961 962 static int 963 msdosfs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) 964 { 965 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 966 struct defid *defhp = (struct defid *) fhp; 967 struct denode *dep; 968 int error; 969 970 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 971 if (error) { 972 *vpp = NULLVP; 973 return (error); 974 } 975 *vpp = DETOV(dep); 976 vnode_create_vobject(*vpp, dep->de_FileSize, curthread); 977 return (0); 978 } 979 980 static struct vfsops msdosfs_vfsops = { 981 .vfs_fhtovp = msdosfs_fhtovp, 982 .vfs_mount = msdosfs_mount, 983 .vfs_cmount = msdosfs_cmount, 984 .vfs_root = msdosfs_root, 985 .vfs_statfs = msdosfs_statfs, 986 .vfs_sync = msdosfs_sync, 987 .vfs_unmount = msdosfs_unmount, 988 }; 989 990 VFS_SET(msdosfs_vfsops, msdosfs, 0); 991 MODULE_VERSION(msdosfs, 1); 992