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/conf.h> 54 #include <sys/namei.h> 55 #include <sys/priv.h> 56 #include <sys/proc.h> 57 #include <sys/kernel.h> 58 #include <sys/vnode.h> 59 #include <sys/mount.h> 60 #include <sys/bio.h> 61 #include <sys/buf.h> 62 #include <sys/fcntl.h> 63 #include <sys/malloc.h> 64 #include <sys/stat.h> /* defines ALLPERMS */ 65 #include <sys/iconv.h> 66 #include <sys/mutex.h> 67 68 #include <fs/msdosfs/bpb.h> 69 #include <fs/msdosfs/bootsect.h> 70 #include <fs/msdosfs/msdosfsmount.h> 71 #include <fs/msdosfs/direntry.h> 72 #include <fs/msdosfs/denode.h> 73 #include <fs/msdosfs/fat.h> 74 75 #include <geom/geom.h> 76 #include <geom/geom_vfs.h> 77 78 /* List of mount options we support */ 79 static const char *msdosfs_opts[] = { 80 "from", 81 "atime", "export", "force", "sync", 82 "uid", "gid", "mask", "dirmask", 83 "shortname", "shortnames", "longname", "longnames", "nowin95", "win95", 84 "kiconv", "cs_win", "cs_dos", "cs_local", "large", 85 NULL 86 }; 87 88 #define MSDOSFS_DFLTBSIZE 4096 89 90 #if 1 /*def PC98*/ 91 /* 92 * XXX - The boot signature formatted by NEC PC-98 DOS looks like a 93 * garbage or a random value :-{ 94 * If you want to use that broken-signatured media, define the 95 * following symbol even though PC/AT. 96 * (ex. mount PC-98 DOS formatted FD on PC/AT) 97 */ 98 #define MSDOSFS_NOCHECKSIG 99 #endif 100 101 MALLOC_DEFINE(M_MSDOSFSMNT, "msdosfs_mount", "MSDOSFS mount structure"); 102 static MALLOC_DEFINE(M_MSDOSFSFAT, "msdosfs_fat", "MSDOSFS file allocation table"); 103 104 struct iconv_functions *msdosfs_iconv = NULL; 105 106 static int update_mp(struct mount *mp, struct thread *td); 107 static int mountmsdosfs(struct vnode *devvp, struct mount *mp, 108 struct thread *td); 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, td)) != 0) 190 return error; 191 pmp->pm_flags |= findwin95(VTODE(rootvp)) 192 ? MSDOSFSMNT_LONGNAME 193 : MSDOSFSMNT_SHORTNAME; 194 vput(rootvp); 195 } 196 } 197 return 0; 198 } 199 200 static int 201 msdosfs_cmount(struct mntarg *ma, void *data, int flags, struct thread *td) 202 { 203 struct msdosfs_args args; 204 int error; 205 206 if (data == NULL) 207 return (EINVAL); 208 error = copyin(data, &args, sizeof args); 209 if (error) 210 return (error); 211 212 ma = mount_argsu(ma, "from", args.fspec, MAXPATHLEN); 213 ma = mount_arg(ma, "export", &args.export, sizeof args.export); 214 ma = mount_argf(ma, "uid", "%d", args.uid); 215 ma = mount_argf(ma, "gid", "%d", args.gid); 216 ma = mount_argf(ma, "mask", "%d", args.mask); 217 ma = mount_argf(ma, "dirmask", "%d", args.dirmask); 218 219 ma = mount_argb(ma, args.flags & MSDOSFSMNT_SHORTNAME, "noshortname"); 220 ma = mount_argb(ma, args.flags & MSDOSFSMNT_LONGNAME, "nolongname"); 221 ma = mount_argb(ma, !(args.flags & MSDOSFSMNT_NOWIN95), "nowin95"); 222 ma = mount_argb(ma, args.flags & MSDOSFSMNT_KICONV, "nokiconv"); 223 224 ma = mount_argsu(ma, "cs_win", args.cs_win, MAXCSLEN); 225 ma = mount_argsu(ma, "cs_dos", args.cs_dos, MAXCSLEN); 226 ma = mount_argsu(ma, "cs_local", args.cs_local, MAXCSLEN); 227 228 error = kernel_mount(ma, flags); 229 230 return (error); 231 } 232 233 /* 234 * mp - path - addr in user space of mount point (ie /usr or whatever) 235 * data - addr in user space of mount params including the name of the block 236 * special file to treat as a filesystem. 237 */ 238 static int 239 msdosfs_mount(struct mount *mp, struct thread *td) 240 { 241 struct vnode *devvp; /* vnode for blk device to mount */ 242 /* msdosfs specific mount control block */ 243 struct msdosfsmount *pmp = NULL; 244 struct nameidata ndp; 245 int error, flags; 246 mode_t accessmode; 247 char *from; 248 249 if (vfs_filteropt(mp->mnt_optnew, msdosfs_opts)) 250 return (EINVAL); 251 252 /* 253 * If updating, check whether changing from read-only to 254 * read/write; if there is no device name, that's all we do. 255 */ 256 if (mp->mnt_flag & MNT_UPDATE) { 257 int ro_to_rw = 0; 258 pmp = VFSTOMSDOSFS(mp); 259 260 if (vfs_flagopt(mp->mnt_optnew, "export", NULL, 0)) { 261 /* 262 * Forbid export requests if filesystem has 263 * MSDOSFS_LARGEFS flag set. 264 */ 265 if ((pmp->pm_flags & MSDOSFS_LARGEFS) != 0) { 266 vfs_mount_error(mp, 267 "MSDOSFS_LARGEFS flag set, cannot export"); 268 return (EOPNOTSUPP); 269 } 270 } 271 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && 272 vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0)) { 273 error = VFS_SYNC(mp, MNT_WAIT, td); 274 if (error) 275 return (error); 276 flags = WRITECLOSE; 277 if (mp->mnt_flag & MNT_FORCE) 278 flags |= FORCECLOSE; 279 error = vflush(mp, 0, flags, td); 280 if (error) 281 return (error); 282 DROP_GIANT(); 283 g_topology_lock(); 284 g_access(pmp->pm_cp, 0, -1, 0); 285 g_topology_unlock(); 286 PICKUP_GIANT(); 287 /* Now the volume is clean. Mark it. */ 288 error = markvoldirty(pmp, 0); 289 if (error && (flags & FORCECLOSE) == 0) 290 return (error); 291 } else if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && 292 !vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0)) { 293 /* 294 * If upgrade to read-write by non-root, then verify 295 * that user has necessary permissions on the device. 296 */ 297 devvp = pmp->pm_devvp; 298 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 299 error = VOP_ACCESS(devvp, VREAD | VWRITE, 300 td->td_ucred, td); 301 if (error) 302 error = priv_check(td, PRIV_VFS_MOUNT_PERM); 303 if (error) { 304 VOP_UNLOCK(devvp, 0, td); 305 return (error); 306 } 307 VOP_UNLOCK(devvp, 0, td); 308 DROP_GIANT(); 309 g_topology_lock(); 310 error = g_access(pmp->pm_cp, 0, 1, 0); 311 g_topology_unlock(); 312 PICKUP_GIANT(); 313 if (error) 314 return (error); 315 316 ro_to_rw = 1; 317 } 318 vfs_flagopt(mp->mnt_optnew, "ro", 319 &pmp->pm_flags, MSDOSFSMNT_RONLY); 320 vfs_flagopt(mp->mnt_optnew, "ro", 321 &mp->mnt_flag, MNT_RDONLY); 322 323 if (ro_to_rw) { 324 /* Now that the volume is modifiable, mark it dirty. */ 325 error = markvoldirty(pmp, 1); 326 if (error) 327 return (error); 328 } 329 } 330 /* 331 * Not an update, or updating the name: look up the name 332 * and verify that it refers to a sensible disk device. 333 */ 334 if (vfs_getopt(mp->mnt_optnew, "from", (void **)&from, NULL)) 335 return (EINVAL); 336 NDINIT(&ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, from, td); 337 error = namei(&ndp); 338 if (error) 339 return (error); 340 devvp = ndp.ni_vp; 341 NDFREE(&ndp, NDF_ONLY_PNBUF); 342 343 if (!vn_isdisk(devvp, &error)) { 344 vput(devvp); 345 return (error); 346 } 347 /* 348 * If mount by non-root, then verify that user has necessary 349 * permissions on the device. 350 */ 351 accessmode = VREAD; 352 if ((mp->mnt_flag & MNT_RDONLY) == 0) 353 accessmode |= VWRITE; 354 error = VOP_ACCESS(devvp, accessmode, td->td_ucred, td); 355 if (error) 356 error = priv_check(td, PRIV_VFS_MOUNT_PERM); 357 if (error) { 358 vput(devvp); 359 return (error); 360 } 361 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 362 error = mountmsdosfs(devvp, mp, td); 363 #ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 364 pmp = VFSTOMSDOSFS(mp); 365 #endif 366 } else { 367 if (devvp != pmp->pm_devvp) 368 error = EINVAL; /* XXX needs translation */ 369 else 370 vput(devvp); 371 } 372 if (error) { 373 vrele(devvp); 374 return (error); 375 } 376 377 error = update_mp(mp, td); 378 if (error) { 379 if ((mp->mnt_flag & MNT_UPDATE) == 0) 380 msdosfs_unmount(mp, MNT_FORCE, td); 381 return error; 382 } 383 384 vfs_mountedfrom(mp, from); 385 #ifdef MSDOSFS_DEBUG 386 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 387 #endif 388 return (0); 389 } 390 391 static int 392 mountmsdosfs(struct vnode *devvp, struct mount *mp, struct thread *td) 393 { 394 struct msdosfsmount *pmp; 395 struct buf *bp; 396 struct cdev *dev = devvp->v_rdev; 397 union bootsector *bsp; 398 struct byte_bpb33 *b33; 399 struct byte_bpb50 *b50; 400 struct byte_bpb710 *b710; 401 u_int8_t SecPerClust; 402 u_long clusters; 403 int ronly, error; 404 struct g_consumer *cp; 405 struct bufobj *bo; 406 407 ronly = !vfs_getopt(mp->mnt_optnew, "ro", NULL, NULL); 408 /* XXX: use VOP_ACCESS to check FS perms */ 409 DROP_GIANT(); 410 g_topology_lock(); 411 error = g_vfs_open(devvp, &cp, "msdos", ronly ? 0 : 1); 412 g_topology_unlock(); 413 PICKUP_GIANT(); 414 VOP_UNLOCK(devvp, 0, td); 415 if (error) 416 return (error); 417 418 bo = &devvp->v_bufobj; 419 bp = NULL; /* both used in error_exit */ 420 pmp = NULL; 421 422 /* 423 * Read the boot sector of the filesystem, and then check the 424 * boot signature. If not a dos boot sector then error out. 425 * 426 * NOTE: 2048 is a maximum sector size in current... 427 */ 428 error = bread(devvp, 0, 2048, NOCRED, &bp); 429 if (error) 430 goto error_exit; 431 bp->b_flags |= B_AGE; 432 bsp = (union bootsector *)bp->b_data; 433 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 434 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 435 b710 = (struct byte_bpb710 *)bsp->bs710.bsBPB; 436 437 #ifndef MSDOSFS_NOCHECKSIG 438 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 439 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 440 error = EINVAL; 441 goto error_exit; 442 } 443 #endif 444 445 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK | M_ZERO); 446 pmp->pm_mountp = mp; 447 pmp->pm_cp = cp; 448 pmp->pm_bo = bo; 449 450 /* 451 * Experimental support for large MS-DOS filesystems. 452 * WARNING: This uses at least 32 bytes of kernel memory (which is not 453 * reclaimed until the FS is unmounted) for each file on disk to map 454 * between the 32-bit inode numbers used by VFS and the 64-bit 455 * pseudo-inode numbers used internally by msdosfs. This is only 456 * safe to use in certain controlled situations (e.g. read-only FS 457 * with less than 1 million files). 458 * Since the mappings do not persist across unmounts (or reboots), these 459 * filesystems are not suitable for exporting through NFS, or any other 460 * application that requires fixed inode numbers. 461 */ 462 vfs_flagopt(mp->mnt_optnew, "large", &pmp->pm_flags, 463 MSDOSFS_LARGEFS); 464 465 /* 466 * Compute several useful quantities from the bpb in the 467 * bootsector. Copy in the dos 5 variant of the bpb then fix up 468 * the fields that are different between dos 5 and dos 3.3. 469 */ 470 SecPerClust = b50->bpbSecPerClust; 471 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 472 if (pmp->pm_BytesPerSec < DEV_BSIZE) { 473 error = EINVAL; 474 goto error_exit; 475 } 476 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 477 pmp->pm_FATs = b50->bpbFATs; 478 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 479 pmp->pm_Sectors = getushort(b50->bpbSectors); 480 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 481 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 482 pmp->pm_Heads = getushort(b50->bpbHeads); 483 pmp->pm_Media = b50->bpbMedia; 484 485 /* calculate the ratio of sector size to DEV_BSIZE */ 486 pmp->pm_BlkPerSec = pmp->pm_BytesPerSec / DEV_BSIZE; 487 488 /* XXX - We should probably check more values here */ 489 if (!pmp->pm_BytesPerSec || !SecPerClust 490 || !pmp->pm_Heads 491 #ifdef PC98 492 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 255) { 493 #else 494 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 63) { 495 #endif 496 error = EINVAL; 497 goto error_exit; 498 } 499 500 if (pmp->pm_Sectors == 0) { 501 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 502 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 503 } else { 504 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 505 pmp->pm_HugeSectors = pmp->pm_Sectors; 506 } 507 if (!(pmp->pm_flags & MSDOSFS_LARGEFS)) { 508 if (pmp->pm_HugeSectors > 0xffffffff / 509 (pmp->pm_BytesPerSec / sizeof(struct direntry)) + 1) { 510 /* 511 * We cannot deal currently with this size of disk 512 * due to fileid limitations (see msdosfs_getattr and 513 * msdosfs_readdir) 514 */ 515 error = EINVAL; 516 vfs_mount_error(mp, 517 "Disk too big, try '-o large' mount option"); 518 goto error_exit; 519 } 520 } 521 522 if (pmp->pm_RootDirEnts == 0) { 523 if (pmp->pm_Sectors 524 || pmp->pm_FATsecs 525 || getushort(b710->bpbFSVers)) { 526 error = EINVAL; 527 printf("mountmsdosfs(): bad FAT32 filesystem\n"); 528 goto error_exit; 529 } 530 pmp->pm_fatmask = FAT32_MASK; 531 pmp->pm_fatmult = 4; 532 pmp->pm_fatdiv = 1; 533 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 534 if (getushort(b710->bpbExtFlags) & FATMIRROR) 535 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 536 else 537 pmp->pm_flags |= MSDOSFS_FATMIRROR; 538 } else 539 pmp->pm_flags |= MSDOSFS_FATMIRROR; 540 541 /* 542 * Check a few values (could do some more): 543 * - logical sector size: power of 2, >= block size 544 * - sectors per cluster: power of 2, >= 1 545 * - number of sectors: >= 1, <= size of partition 546 * - number of FAT sectors: >= 1 547 */ 548 if ( (SecPerClust == 0) 549 || (SecPerClust & (SecPerClust - 1)) 550 || (pmp->pm_BytesPerSec < DEV_BSIZE) 551 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 552 || (pmp->pm_HugeSectors == 0) 553 || (pmp->pm_FATsecs == 0) 554 ) { 555 error = EINVAL; 556 goto error_exit; 557 } 558 559 pmp->pm_HugeSectors *= pmp->pm_BlkPerSec; 560 pmp->pm_HiddenSects *= pmp->pm_BlkPerSec; /* XXX not used? */ 561 pmp->pm_FATsecs *= pmp->pm_BlkPerSec; 562 SecPerClust *= pmp->pm_BlkPerSec; 563 564 pmp->pm_fatblk = pmp->pm_ResSectors * pmp->pm_BlkPerSec; 565 566 if (FAT32(pmp)) { 567 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 568 pmp->pm_firstcluster = pmp->pm_fatblk 569 + (pmp->pm_FATs * pmp->pm_FATsecs); 570 pmp->pm_fsinfo = getushort(b710->bpbFSInfo) * pmp->pm_BlkPerSec; 571 } else { 572 pmp->pm_rootdirblk = pmp->pm_fatblk + 573 (pmp->pm_FATs * pmp->pm_FATsecs); 574 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 575 + DEV_BSIZE - 1) 576 / DEV_BSIZE; /* in blocks */ 577 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 578 } 579 580 pmp->pm_maxcluster = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 581 SecPerClust + 1; 582 pmp->pm_fatsize = pmp->pm_FATsecs * DEV_BSIZE; /* XXX not used? */ 583 584 if (pmp->pm_fatmask == 0) { 585 if (pmp->pm_maxcluster 586 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 587 /* 588 * This will usually be a floppy disk. This size makes 589 * sure that one fat entry will not be split across 590 * multiple blocks. 591 */ 592 pmp->pm_fatmask = FAT12_MASK; 593 pmp->pm_fatmult = 3; 594 pmp->pm_fatdiv = 2; 595 } else { 596 pmp->pm_fatmask = FAT16_MASK; 597 pmp->pm_fatmult = 2; 598 pmp->pm_fatdiv = 1; 599 } 600 } 601 602 clusters = (pmp->pm_fatsize / pmp->pm_fatmult) * pmp->pm_fatdiv; 603 if (pmp->pm_maxcluster >= clusters) { 604 printf("Warning: number of clusters (%ld) exceeds FAT " 605 "capacity (%ld)\n", pmp->pm_maxcluster + 1, clusters); 606 pmp->pm_maxcluster = clusters - 1; 607 } 608 609 610 if (FAT12(pmp)) 611 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 612 else 613 pmp->pm_fatblocksize = MSDOSFS_DFLTBSIZE; 614 615 pmp->pm_fatblocksec = pmp->pm_fatblocksize / DEV_BSIZE; 616 pmp->pm_bnshift = ffs(DEV_BSIZE) - 1; 617 618 /* 619 * Compute mask and shift value for isolating cluster relative byte 620 * offsets and cluster numbers from a file offset. 621 */ 622 pmp->pm_bpcluster = SecPerClust * DEV_BSIZE; 623 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 624 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 625 626 /* 627 * Check for valid cluster size 628 * must be a power of 2 629 */ 630 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 631 error = EINVAL; 632 goto error_exit; 633 } 634 635 /* 636 * Release the bootsector buffer. 637 */ 638 brelse(bp); 639 bp = NULL; 640 641 /* 642 * Check FSInfo. 643 */ 644 if (pmp->pm_fsinfo) { 645 struct fsinfo *fp; 646 647 if ((error = bread(devvp, pmp->pm_fsinfo, fsi_size(pmp), 648 NOCRED, &bp)) != 0) 649 goto error_exit; 650 fp = (struct fsinfo *)bp->b_data; 651 if (!bcmp(fp->fsisig1, "RRaA", 4) 652 && !bcmp(fp->fsisig2, "rrAa", 4) 653 && !bcmp(fp->fsisig3, "\0\0\125\252", 4) 654 && !bcmp(fp->fsisig4, "\0\0\125\252", 4)) { 655 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 656 if (pmp->pm_nxtfree == 0xffffffff) 657 pmp->pm_nxtfree = CLUST_FIRST; 658 } else 659 pmp->pm_fsinfo = 0; 660 brelse(bp); 661 bp = NULL; 662 } 663 664 /* 665 * Check and validate (or perhaps invalidate?) the fsinfo structure? 666 */ 667 if (pmp->pm_fsinfo && pmp->pm_nxtfree > pmp->pm_maxcluster) { 668 printf( 669 "Next free cluster in FSInfo (%lu) exceeds maxcluster (%lu)\n", 670 pmp->pm_nxtfree, pmp->pm_maxcluster); 671 error = EINVAL; 672 goto error_exit; 673 } 674 675 /* 676 * Allocate memory for the bitmap of allocated clusters, and then 677 * fill it in. 678 */ 679 pmp->pm_inusemap = malloc(howmany(pmp->pm_maxcluster + 1, N_INUSEBITS) 680 * sizeof(*pmp->pm_inusemap), 681 M_MSDOSFSFAT, M_WAITOK); 682 683 /* 684 * fillinusemap() needs pm_devvp. 685 */ 686 pmp->pm_devvp = devvp; 687 688 /* 689 * Have the inuse map filled in. 690 */ 691 if ((error = fillinusemap(pmp)) != 0) 692 goto error_exit; 693 694 /* 695 * If they want fat updates to be synchronous then let them suffer 696 * the performance degradation in exchange for the on disk copy of 697 * the fat being correct just about all the time. I suppose this 698 * would be a good thing to turn on if the kernel is still flakey. 699 */ 700 if (mp->mnt_flag & MNT_SYNCHRONOUS) 701 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 702 703 /* 704 * Finish up. 705 */ 706 if (ronly) 707 pmp->pm_flags |= MSDOSFSMNT_RONLY; 708 else { 709 /* Mark the volume dirty while it is mounted read/write. */ 710 if ((error = markvoldirty(pmp, 1)) != 0) 711 goto error_exit; 712 pmp->pm_fmod = 1; 713 } 714 mp->mnt_data = (qaddr_t) pmp; 715 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 716 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 717 MNT_ILOCK(mp); 718 mp->mnt_flag |= MNT_LOCAL; 719 MNT_IUNLOCK(mp); 720 721 if (pmp->pm_flags & MSDOSFS_LARGEFS) 722 msdosfs_fileno_init(mp); 723 724 return 0; 725 726 error_exit: 727 if (bp) 728 brelse(bp); 729 if (cp != NULL) { 730 DROP_GIANT(); 731 g_topology_lock(); 732 g_vfs_close(cp, td); 733 g_topology_unlock(); 734 PICKUP_GIANT(); 735 } 736 if (pmp) { 737 if (pmp->pm_inusemap) 738 free(pmp->pm_inusemap, M_MSDOSFSFAT); 739 free(pmp, M_MSDOSFSMNT); 740 mp->mnt_data = (qaddr_t)0; 741 } 742 return (error); 743 } 744 745 /* 746 * Unmount the filesystem described by mp. 747 */ 748 static int 749 msdosfs_unmount(struct mount *mp, int mntflags, struct thread *td) 750 { 751 struct msdosfsmount *pmp; 752 int error, flags; 753 754 flags = 0; 755 if (mntflags & MNT_FORCE) 756 flags |= FORCECLOSE; 757 error = vflush(mp, 0, flags, td); 758 if (error) 759 return error; 760 pmp = VFSTOMSDOSFS(mp); 761 if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) { 762 if (pmp->pm_w2u) 763 msdosfs_iconv->close(pmp->pm_w2u); 764 if (pmp->pm_u2w) 765 msdosfs_iconv->close(pmp->pm_u2w); 766 if (pmp->pm_d2u) 767 msdosfs_iconv->close(pmp->pm_d2u); 768 if (pmp->pm_u2d) 769 msdosfs_iconv->close(pmp->pm_u2d); 770 } 771 772 /* If the volume was mounted read/write, mark it clean now. */ 773 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) == 0) { 774 error = markvoldirty(pmp, 0); 775 if (error && (flags & FORCECLOSE) == 0) 776 return (error); 777 } 778 #ifdef MSDOSFS_DEBUG 779 { 780 struct vnode *vp = pmp->pm_devvp; 781 782 VI_LOCK(vp); 783 vn_printf(vp, 784 "msdosfs_umount(): just before calling VOP_CLOSE()\n"); 785 printf("freef %p, freeb %p, mount %p\n", 786 TAILQ_NEXT(vp, v_freelist), vp->v_freelist.tqe_prev, 787 vp->v_mount); 788 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %ld, type %d\n", 789 TAILQ_FIRST(&vp->v_bufobj.bo_clean.bv_hd), 790 TAILQ_FIRST(&vp->v_bufobj.bo_dirty.bv_hd), 791 vp->v_bufobj.bo_numoutput, vp->v_type); 792 VI_UNLOCK(vp); 793 } 794 #endif 795 DROP_GIANT(); 796 g_topology_lock(); 797 g_vfs_close(pmp->pm_cp, td); 798 g_topology_unlock(); 799 PICKUP_GIANT(); 800 vrele(pmp->pm_devvp); 801 free(pmp->pm_inusemap, M_MSDOSFSFAT); 802 if (pmp->pm_flags & MSDOSFS_LARGEFS) { 803 msdosfs_fileno_free(mp); 804 } 805 free(pmp, M_MSDOSFSMNT); 806 mp->mnt_data = (qaddr_t)0; 807 MNT_ILOCK(mp); 808 mp->mnt_flag &= ~MNT_LOCAL; 809 MNT_IUNLOCK(mp); 810 return (error); 811 } 812 813 static int 814 msdosfs_root(struct mount *mp, int flags, struct vnode **vpp, struct thread *td) 815 { 816 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 817 struct denode *ndep; 818 int error; 819 820 #ifdef MSDOSFS_DEBUG 821 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 822 #endif 823 error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep); 824 if (error) 825 return (error); 826 *vpp = DETOV(ndep); 827 return (0); 828 } 829 830 static int 831 msdosfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td) 832 { 833 struct msdosfsmount *pmp; 834 835 pmp = VFSTOMSDOSFS(mp); 836 sbp->f_bsize = pmp->pm_bpcluster; 837 sbp->f_iosize = pmp->pm_bpcluster; 838 sbp->f_blocks = pmp->pm_maxcluster + 1; 839 sbp->f_bfree = pmp->pm_freeclustercount; 840 sbp->f_bavail = pmp->pm_freeclustercount; 841 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 842 sbp->f_ffree = 0; /* what to put in here? */ 843 return (0); 844 } 845 846 static int 847 msdosfs_sync(struct mount *mp, int waitfor, struct thread *td) 848 { 849 struct vnode *vp, *nvp; 850 struct denode *dep; 851 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 852 int error, allerror = 0; 853 854 /* 855 * If we ever switch to not updating all of the fats all the time, 856 * this would be the place to update them from the first one. 857 */ 858 if (pmp->pm_fmod != 0) { 859 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 860 panic("msdosfs_sync: rofs mod"); 861 else { 862 /* update fats here */ 863 } 864 } 865 /* 866 * Write back each (modified) denode. 867 */ 868 MNT_ILOCK(mp); 869 loop: 870 MNT_VNODE_FOREACH(vp, mp, nvp) { 871 VI_LOCK(vp); 872 if (vp->v_type == VNON || (vp->v_iflag & VI_DOOMED)) { 873 VI_UNLOCK(vp); 874 continue; 875 } 876 MNT_IUNLOCK(mp); 877 dep = VTODE(vp); 878 if ((dep->de_flag & 879 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 && 880 (vp->v_bufobj.bo_dirty.bv_cnt == 0 || 881 waitfor == MNT_LAZY)) { 882 VI_UNLOCK(vp); 883 MNT_ILOCK(mp); 884 continue; 885 } 886 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td); 887 if (error) { 888 MNT_ILOCK(mp); 889 if (error == ENOENT) 890 goto loop; 891 continue; 892 } 893 error = VOP_FSYNC(vp, waitfor, td); 894 if (error) 895 allerror = error; 896 VOP_UNLOCK(vp, 0, td); 897 vrele(vp); 898 MNT_ILOCK(mp); 899 } 900 MNT_IUNLOCK(mp); 901 902 /* 903 * Flush filesystem control info. 904 */ 905 if (waitfor != MNT_LAZY) { 906 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY, td); 907 error = VOP_FSYNC(pmp->pm_devvp, waitfor, td); 908 if (error) 909 allerror = error; 910 VOP_UNLOCK(pmp->pm_devvp, 0, td); 911 } 912 return (allerror); 913 } 914 915 static int 916 msdosfs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) 917 { 918 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 919 struct defid *defhp = (struct defid *) fhp; 920 struct denode *dep; 921 int error; 922 923 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 924 if (error) { 925 *vpp = NULLVP; 926 return (error); 927 } 928 *vpp = DETOV(dep); 929 vnode_create_vobject(*vpp, dep->de_FileSize, curthread); 930 return (0); 931 } 932 933 static struct vfsops msdosfs_vfsops = { 934 .vfs_fhtovp = msdosfs_fhtovp, 935 .vfs_mount = msdosfs_mount, 936 .vfs_cmount = msdosfs_cmount, 937 .vfs_root = msdosfs_root, 938 .vfs_statfs = msdosfs_statfs, 939 .vfs_sync = msdosfs_sync, 940 .vfs_unmount = msdosfs_unmount, 941 }; 942 943 VFS_SET(msdosfs_vfsops, msdosfs, 0); 944 MODULE_VERSION(msdosfs, 1); 945