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 #include "opt_msdosfs.h" 79 80 /* List of mount options we support */ 81 static const char *msdosfs_opts[] = { 82 "from", 83 "export", "force", "sync", 84 "uid", "gid", "mask", "dirmask", 85 "shortname", "shortnames", "longname", "longnames", "nowin95", "win95", 86 "kiconv", "cs_win", "cs_dos", "cs_local", 87 NULL 88 }; 89 90 #define MSDOSFS_DFLTBSIZE 4096 91 92 #if 1 /*def PC98*/ 93 /* 94 * XXX - The boot signature formatted by NEC PC-98 DOS looks like a 95 * garbage or a random value :-{ 96 * If you want to use that broken-signatured media, define the 97 * following symbol even though PC/AT. 98 * (ex. mount PC-98 DOS formatted FD on PC/AT) 99 */ 100 #define MSDOSFS_NOCHECKSIG 101 #endif 102 103 MALLOC_DEFINE(M_MSDOSFSMNT, "msdosfs_mount", "MSDOSFS mount structure"); 104 static MALLOC_DEFINE(M_MSDOSFSFAT, "msdosfs_fat", "MSDOSFS file allocation table"); 105 106 struct iconv_functions *msdosfs_iconv = NULL; 107 108 static int update_mp(struct mount *mp, struct thread *td); 109 static int mountmsdosfs(struct vnode *devvp, struct mount *mp, 110 struct thread *td); 111 static vfs_fhtovp_t msdosfs_fhtovp; 112 static vfs_mount_t msdosfs_mount; 113 static vfs_root_t msdosfs_root; 114 static vfs_statfs_t msdosfs_statfs; 115 static vfs_sync_t msdosfs_sync; 116 static vfs_unmount_t msdosfs_unmount; 117 static vfs_vptofh_t msdosfs_vptofh; 118 119 /* Maximum length of a character set name (arbitrary). */ 120 #define MAXCSLEN 64 121 122 static int 123 update_mp(mp, td) 124 struct mount *mp; 125 struct thread *td; 126 { 127 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 128 void *dos, *win, *local; 129 int error, v; 130 131 if (!vfs_getopt(mp->mnt_optnew, "kiconv", NULL, NULL)) { 132 if (msdosfs_iconv != NULL) { 133 error = vfs_getopt(mp->mnt_optnew, 134 "cs_win", &win, NULL); 135 if (!error) 136 error = vfs_getopt(mp->mnt_optnew, 137 "cs_local", &local, NULL); 138 if (!error) 139 error = vfs_getopt(mp->mnt_optnew, 140 "cs_dos", &dos, NULL); 141 if (!error) { 142 msdosfs_iconv->open(win, local, &pmp->pm_u2w); 143 msdosfs_iconv->open(local, win, &pmp->pm_w2u); 144 msdosfs_iconv->open(dos, local, &pmp->pm_u2d); 145 msdosfs_iconv->open(local, dos, &pmp->pm_d2u); 146 } 147 if (error != 0) 148 return (error); 149 } else { 150 pmp->pm_w2u = NULL; 151 pmp->pm_u2w = NULL; 152 pmp->pm_d2u = NULL; 153 pmp->pm_u2d = NULL; 154 } 155 } 156 157 if (1 == vfs_scanopt(mp->mnt_optnew, "gid", "%d", &v)) 158 pmp->pm_gid = v; 159 if (1 == vfs_scanopt(mp->mnt_optnew, "uid", "%d", &v)) 160 pmp->pm_uid = v; 161 if (1 == vfs_scanopt(mp->mnt_optnew, "mask", "%d", &v)) 162 pmp->pm_mask = v & ALLPERMS; 163 if (1 == vfs_scanopt(mp->mnt_optnew, "dirmask", "%d", &v)) 164 pmp->pm_dirmask = v & ALLPERMS; 165 vfs_flagopt(mp->mnt_optnew, "shortname", 166 &pmp->pm_flags, MSDOSFSMNT_SHORTNAME); 167 vfs_flagopt(mp->mnt_optnew, "shortnames", 168 &pmp->pm_flags, MSDOSFSMNT_SHORTNAME); 169 vfs_flagopt(mp->mnt_optnew, "longname", 170 &pmp->pm_flags, MSDOSFSMNT_LONGNAME); 171 vfs_flagopt(mp->mnt_optnew, "longnames", 172 &pmp->pm_flags, MSDOSFSMNT_LONGNAME); 173 vfs_flagopt(mp->mnt_optnew, "kiconv", 174 &pmp->pm_flags, MSDOSFSMNT_KICONV); 175 176 if (vfs_getopt(mp->mnt_optnew, "nowin95", NULL, NULL) == 0) 177 pmp->pm_flags |= MSDOSFSMNT_NOWIN95; 178 else 179 pmp->pm_flags &= ~MSDOSFSMNT_NOWIN95; 180 181 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 182 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 183 else if (!(pmp->pm_flags & 184 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 185 struct vnode *rootvp; 186 187 /* 188 * Try to divine whether to support Win'95 long filenames 189 */ 190 if (FAT32(pmp)) 191 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 192 else { 193 if ((error = 194 msdosfs_root(mp, LK_EXCLUSIVE, &rootvp, td)) != 0) 195 return error; 196 pmp->pm_flags |= findwin95(VTODE(rootvp)) 197 ? MSDOSFSMNT_LONGNAME 198 : MSDOSFSMNT_SHORTNAME; 199 vput(rootvp); 200 } 201 } 202 return 0; 203 } 204 205 static int 206 msdosfs_cmount(struct mntarg *ma, void *data, int flags, struct thread *td) 207 { 208 struct msdosfs_args args; 209 int error; 210 211 if (data == NULL) 212 return (EINVAL); 213 error = copyin(data, &args, sizeof args); 214 if (error) 215 return (error); 216 217 ma = mount_argsu(ma, "from", args.fspec, MAXPATHLEN); 218 ma = mount_arg(ma, "export", &args.export, sizeof args.export); 219 ma = mount_argf(ma, "uid", "%d", args.uid); 220 ma = mount_argf(ma, "gid", "%d", args.gid); 221 ma = mount_argf(ma, "mask", "%d", args.mask); 222 ma = mount_argf(ma, "dirmask", "%d", args.dirmask); 223 224 ma = mount_argb(ma, args.flags & MSDOSFSMNT_SHORTNAME, "noshortname"); 225 ma = mount_argb(ma, args.flags & MSDOSFSMNT_LONGNAME, "nolongname"); 226 ma = mount_argb(ma, !(args.flags & MSDOSFSMNT_NOWIN95), "nowin95"); 227 ma = mount_argb(ma, args.flags & MSDOSFSMNT_KICONV, "nokiconv"); 228 229 ma = mount_argsu(ma, "cs_win", args.cs_win, MAXCSLEN); 230 ma = mount_argsu(ma, "cs_dos", args.cs_dos, MAXCSLEN); 231 ma = mount_argsu(ma, "cs_local", args.cs_local, MAXCSLEN); 232 233 error = kernel_mount(ma, flags); 234 235 return (error); 236 } 237 238 /* 239 * mp - path - addr in user space of mount point (ie /usr or whatever) 240 * data - addr in user space of mount params including the name of the block 241 * special file to treat as a filesystem. 242 */ 243 static int 244 msdosfs_mount(struct mount *mp, struct thread *td) 245 { 246 struct vnode *devvp; /* vnode for blk device to mount */ 247 /* msdosfs specific mount control block */ 248 struct msdosfsmount *pmp = NULL; 249 struct nameidata ndp; 250 int error, flags; 251 mode_t accessmode; 252 char *from; 253 254 if (vfs_filteropt(mp->mnt_optnew, msdosfs_opts)) 255 return (EINVAL); 256 257 /* 258 * If updating, check whether changing from read-only to 259 * read/write; if there is no device name, that's all we do. 260 */ 261 if (mp->mnt_flag & MNT_UPDATE) { 262 int ro_to_rw = 0; 263 pmp = VFSTOMSDOSFS(mp); 264 265 if (vfs_flagopt(mp->mnt_optnew, "export", NULL, 0)) { 266 /* 267 * Forbid export requests if filesystem has 268 * MSDOSFS_LARGEFS flag set. 269 */ 270 if ((pmp->pm_flags & MSDOSFS_LARGEFS) != 0) { 271 vfs_mount_error(mp, 272 "MSDOSFS_LARGEFS flag set, cannot export"); 273 return (EOPNOTSUPP); 274 } 275 } 276 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && 277 vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0)) { 278 error = VFS_SYNC(mp, MNT_WAIT, td); 279 if (error) 280 return (error); 281 flags = WRITECLOSE; 282 if (mp->mnt_flag & MNT_FORCE) 283 flags |= FORCECLOSE; 284 error = vflush(mp, 0, flags, td); 285 if (error) 286 return (error); 287 DROP_GIANT(); 288 g_topology_lock(); 289 g_access(pmp->pm_cp, 0, -1, 0); 290 g_topology_unlock(); 291 PICKUP_GIANT(); 292 /* Now the volume is clean. Mark it. */ 293 error = markvoldirty(pmp, 0); 294 if (error && (flags & FORCECLOSE) == 0) 295 return (error); 296 } else if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && 297 !vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0)) { 298 /* 299 * If upgrade to read-write by non-root, then verify 300 * that user has necessary permissions on the device. 301 */ 302 devvp = pmp->pm_devvp; 303 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 304 error = VOP_ACCESS(devvp, VREAD | VWRITE, 305 td->td_ucred, td); 306 if (error) 307 error = priv_check(td, PRIV_VFS_MOUNT_PERM); 308 if (error) { 309 VOP_UNLOCK(devvp, 0, td); 310 return (error); 311 } 312 VOP_UNLOCK(devvp, 0, td); 313 DROP_GIANT(); 314 g_topology_lock(); 315 error = g_access(pmp->pm_cp, 0, 1, 0); 316 g_topology_unlock(); 317 PICKUP_GIANT(); 318 if (error) 319 return (error); 320 321 ro_to_rw = 1; 322 } 323 vfs_flagopt(mp->mnt_optnew, "ro", 324 &pmp->pm_flags, MSDOSFSMNT_RONLY); 325 vfs_flagopt(mp->mnt_optnew, "ro", 326 &mp->mnt_flag, MNT_RDONLY); 327 328 if (ro_to_rw) { 329 /* Now that the volume is modifiable, mark it dirty. */ 330 error = markvoldirty(pmp, 1); 331 if (error) 332 return (error); 333 } 334 335 if (vfs_getopt(mp->mnt_optnew, "from", NULL, NULL)) { 336 #ifdef __notyet__ /* doesn't work correctly with current mountd XXX */ 337 if (args.flags & MSDOSFSMNT_MNTOPT) { 338 pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT; 339 pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT; 340 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 341 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 342 } 343 #endif 344 } 345 } 346 /* 347 * Not an update, or updating the name: look up the name 348 * and verify that it refers to a sensible disk device. 349 */ 350 if (vfs_getopt(mp->mnt_optnew, "from", (void **)&from, NULL)) 351 return (EINVAL); 352 NDINIT(&ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, from, td); 353 error = namei(&ndp); 354 if (error) 355 return (error); 356 devvp = ndp.ni_vp; 357 NDFREE(&ndp, NDF_ONLY_PNBUF); 358 359 if (!vn_isdisk(devvp, &error)) { 360 vput(devvp); 361 return (error); 362 } 363 /* 364 * If mount by non-root, then verify that user has necessary 365 * permissions on the device. 366 */ 367 accessmode = VREAD; 368 if ((mp->mnt_flag & MNT_RDONLY) == 0) 369 accessmode |= VWRITE; 370 error = VOP_ACCESS(devvp, accessmode, td->td_ucred, td); 371 if (error) 372 error = priv_check(td, PRIV_VFS_MOUNT_PERM); 373 if (error) { 374 vput(devvp); 375 return (error); 376 } 377 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 378 error = mountmsdosfs(devvp, mp, td); 379 #ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 380 pmp = VFSTOMSDOSFS(mp); 381 #endif 382 } else { 383 if (devvp != pmp->pm_devvp) 384 error = EINVAL; /* XXX needs translation */ 385 else 386 vput(devvp); 387 } 388 if (error) { 389 vrele(devvp); 390 return (error); 391 } 392 393 error = update_mp(mp, td); 394 if (error) { 395 if ((mp->mnt_flag & MNT_UPDATE) == 0) 396 msdosfs_unmount(mp, MNT_FORCE, td); 397 return error; 398 } 399 400 vfs_mountedfrom(mp, from); 401 #ifdef MSDOSFS_DEBUG 402 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 403 #endif 404 return (0); 405 } 406 407 static int 408 mountmsdosfs(devvp, mp, td) 409 struct vnode *devvp; 410 struct mount *mp; 411 struct thread *td; 412 { 413 struct msdosfsmount *pmp; 414 struct buf *bp; 415 struct cdev *dev = devvp->v_rdev; 416 union bootsector *bsp; 417 struct byte_bpb33 *b33; 418 struct byte_bpb50 *b50; 419 struct byte_bpb710 *b710; 420 u_int8_t SecPerClust; 421 u_long clusters; 422 int ronly, error; 423 struct g_consumer *cp; 424 struct bufobj *bo; 425 426 ronly = !vfs_getopt(mp->mnt_optnew, "ro", NULL, NULL); 427 /* XXX: use VOP_ACCESS to check FS perms */ 428 DROP_GIANT(); 429 g_topology_lock(); 430 error = g_vfs_open(devvp, &cp, "msdos", ronly ? 0 : 1); 431 g_topology_unlock(); 432 PICKUP_GIANT(); 433 VOP_UNLOCK(devvp, 0, td); 434 if (error) 435 return (error); 436 437 bo = &devvp->v_bufobj; 438 bp = NULL; /* both used in error_exit */ 439 pmp = NULL; 440 441 /* 442 * Read the boot sector of the filesystem, and then check the 443 * boot signature. If not a dos boot sector then error out. 444 * 445 * NOTE: 2048 is a maximum sector size in current... 446 */ 447 error = bread(devvp, 0, 2048, NOCRED, &bp); 448 if (error) 449 goto error_exit; 450 bp->b_flags |= B_AGE; 451 bsp = (union bootsector *)bp->b_data; 452 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 453 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 454 b710 = (struct byte_bpb710 *)bsp->bs710.bsBPB; 455 456 #ifndef MSDOSFS_NOCHECKSIG 457 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 458 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 459 error = EINVAL; 460 goto error_exit; 461 } 462 #endif 463 464 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK | M_ZERO); 465 pmp->pm_mountp = mp; 466 pmp->pm_cp = cp; 467 pmp->pm_bo = bo; 468 469 /* 470 * Compute several useful quantities from the bpb in the 471 * bootsector. Copy in the dos 5 variant of the bpb then fix up 472 * the fields that are different between dos 5 and dos 3.3. 473 */ 474 SecPerClust = b50->bpbSecPerClust; 475 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 476 if (pmp->pm_BytesPerSec < DEV_BSIZE) { 477 error = EINVAL; 478 goto error_exit; 479 } 480 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 481 pmp->pm_FATs = b50->bpbFATs; 482 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 483 pmp->pm_Sectors = getushort(b50->bpbSectors); 484 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 485 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 486 pmp->pm_Heads = getushort(b50->bpbHeads); 487 pmp->pm_Media = b50->bpbMedia; 488 489 /* calculate the ratio of sector size to DEV_BSIZE */ 490 pmp->pm_BlkPerSec = pmp->pm_BytesPerSec / DEV_BSIZE; 491 492 /* XXX - We should probably check more values here */ 493 if (!pmp->pm_BytesPerSec || !SecPerClust 494 || !pmp->pm_Heads 495 #ifdef PC98 496 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 255) { 497 #else 498 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 63) { 499 #endif 500 error = EINVAL; 501 goto error_exit; 502 } 503 504 if (pmp->pm_Sectors == 0) { 505 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 506 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 507 } else { 508 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 509 pmp->pm_HugeSectors = pmp->pm_Sectors; 510 } 511 #ifndef MSDOSFS_LARGE 512 if (pmp->pm_HugeSectors > 0xffffffff / 513 (pmp->pm_BytesPerSec / sizeof(struct direntry)) + 1) { 514 /* 515 * We cannot deal currently with this size of disk 516 * due to fileid limitations (see msdosfs_getattr and 517 * msdosfs_readdir) 518 */ 519 error = EINVAL; 520 printf("mountmsdosfs(): disk too big, sorry\n"); 521 goto error_exit; 522 } 523 #endif /* !MSDOSFS_LARGE */ 524 525 if (pmp->pm_RootDirEnts == 0) { 526 if (pmp->pm_Sectors 527 || pmp->pm_FATsecs 528 || getushort(b710->bpbFSVers)) { 529 error = EINVAL; 530 printf("mountmsdosfs(): bad FAT32 filesystem\n"); 531 goto error_exit; 532 } 533 pmp->pm_fatmask = FAT32_MASK; 534 pmp->pm_fatmult = 4; 535 pmp->pm_fatdiv = 1; 536 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 537 if (getushort(b710->bpbExtFlags) & FATMIRROR) 538 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 539 else 540 pmp->pm_flags |= MSDOSFS_FATMIRROR; 541 } else 542 pmp->pm_flags |= MSDOSFS_FATMIRROR; 543 544 /* 545 * Check a few values (could do some more): 546 * - logical sector size: power of 2, >= block size 547 * - sectors per cluster: power of 2, >= 1 548 * - number of sectors: >= 1, <= size of partition 549 * - number of FAT sectors: >= 1 550 */ 551 if ( (SecPerClust == 0) 552 || (SecPerClust & (SecPerClust - 1)) 553 || (pmp->pm_BytesPerSec < DEV_BSIZE) 554 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 555 || (pmp->pm_HugeSectors == 0) 556 || (pmp->pm_FATsecs == 0) 557 ) { 558 error = EINVAL; 559 goto error_exit; 560 } 561 562 pmp->pm_HugeSectors *= pmp->pm_BlkPerSec; 563 pmp->pm_HiddenSects *= pmp->pm_BlkPerSec; /* XXX not used? */ 564 pmp->pm_FATsecs *= pmp->pm_BlkPerSec; 565 SecPerClust *= pmp->pm_BlkPerSec; 566 567 pmp->pm_fatblk = pmp->pm_ResSectors * pmp->pm_BlkPerSec; 568 569 if (FAT32(pmp)) { 570 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 571 pmp->pm_firstcluster = pmp->pm_fatblk 572 + (pmp->pm_FATs * pmp->pm_FATsecs); 573 pmp->pm_fsinfo = getushort(b710->bpbFSInfo) * pmp->pm_BlkPerSec; 574 } else { 575 pmp->pm_rootdirblk = pmp->pm_fatblk + 576 (pmp->pm_FATs * pmp->pm_FATsecs); 577 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 578 + DEV_BSIZE - 1) 579 / DEV_BSIZE; /* in blocks */ 580 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 581 } 582 583 pmp->pm_maxcluster = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 584 SecPerClust + 1; 585 pmp->pm_fatsize = pmp->pm_FATsecs * DEV_BSIZE; /* XXX not used? */ 586 587 if (pmp->pm_fatmask == 0) { 588 if (pmp->pm_maxcluster 589 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 590 /* 591 * This will usually be a floppy disk. This size makes 592 * sure that one fat entry will not be split across 593 * multiple blocks. 594 */ 595 pmp->pm_fatmask = FAT12_MASK; 596 pmp->pm_fatmult = 3; 597 pmp->pm_fatdiv = 2; 598 } else { 599 pmp->pm_fatmask = FAT16_MASK; 600 pmp->pm_fatmult = 2; 601 pmp->pm_fatdiv = 1; 602 } 603 } 604 605 clusters = (pmp->pm_fatsize / pmp->pm_fatmult) * pmp->pm_fatdiv; 606 if (pmp->pm_maxcluster >= clusters) { 607 printf("Warning: number of clusters (%ld) exceeds FAT " 608 "capacity (%ld)\n", pmp->pm_maxcluster + 1, clusters); 609 pmp->pm_maxcluster = clusters - 1; 610 } 611 612 613 if (FAT12(pmp)) 614 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 615 else 616 pmp->pm_fatblocksize = MSDOSFS_DFLTBSIZE; 617 618 pmp->pm_fatblocksec = pmp->pm_fatblocksize / DEV_BSIZE; 619 pmp->pm_bnshift = ffs(DEV_BSIZE) - 1; 620 621 /* 622 * Compute mask and shift value for isolating cluster relative byte 623 * offsets and cluster numbers from a file offset. 624 */ 625 pmp->pm_bpcluster = SecPerClust * DEV_BSIZE; 626 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 627 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 628 629 /* 630 * Check for valid cluster size 631 * must be a power of 2 632 */ 633 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 634 error = EINVAL; 635 goto error_exit; 636 } 637 638 /* 639 * Release the bootsector buffer. 640 */ 641 brelse(bp); 642 bp = NULL; 643 644 /* 645 * Check FSInfo. 646 */ 647 if (pmp->pm_fsinfo) { 648 struct fsinfo *fp; 649 650 if ((error = bread(devvp, pmp->pm_fsinfo, fsi_size(pmp), 651 NOCRED, &bp)) != 0) 652 goto error_exit; 653 fp = (struct fsinfo *)bp->b_data; 654 if (!bcmp(fp->fsisig1, "RRaA", 4) 655 && !bcmp(fp->fsisig2, "rrAa", 4) 656 && !bcmp(fp->fsisig3, "\0\0\125\252", 4) 657 && !bcmp(fp->fsisig4, "\0\0\125\252", 4)) { 658 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 659 if (pmp->pm_nxtfree == 0xffffffff) 660 pmp->pm_nxtfree = CLUST_FIRST; 661 } else 662 pmp->pm_fsinfo = 0; 663 brelse(bp); 664 bp = NULL; 665 } 666 667 /* 668 * Check and validate (or perhaps invalidate?) the fsinfo structure? 669 */ 670 if (pmp->pm_fsinfo && pmp->pm_nxtfree > pmp->pm_maxcluster) { 671 printf( 672 "Next free cluster in FSInfo (%lu) exceeds maxcluster (%lu)\n", 673 pmp->pm_nxtfree, pmp->pm_maxcluster); 674 error = EINVAL; 675 goto error_exit; 676 } 677 678 /* 679 * Allocate memory for the bitmap of allocated clusters, and then 680 * fill it in. 681 */ 682 pmp->pm_inusemap = malloc(howmany(pmp->pm_maxcluster + 1, N_INUSEBITS) 683 * sizeof(*pmp->pm_inusemap), 684 M_MSDOSFSFAT, M_WAITOK); 685 686 /* 687 * fillinusemap() needs pm_devvp. 688 */ 689 pmp->pm_devvp = devvp; 690 691 /* 692 * Have the inuse map filled in. 693 */ 694 if ((error = fillinusemap(pmp)) != 0) 695 goto error_exit; 696 697 /* 698 * If they want fat updates to be synchronous then let them suffer 699 * the performance degradation in exchange for the on disk copy of 700 * the fat being correct just about all the time. I suppose this 701 * would be a good thing to turn on if the kernel is still flakey. 702 */ 703 if (mp->mnt_flag & MNT_SYNCHRONOUS) 704 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 705 706 /* 707 * Finish up. 708 */ 709 if (ronly) 710 pmp->pm_flags |= MSDOSFSMNT_RONLY; 711 else { 712 /* Mark the volume dirty while it is mounted read/write. */ 713 if ((error = markvoldirty(pmp, 1)) != 0) 714 goto error_exit; 715 pmp->pm_fmod = 1; 716 } 717 mp->mnt_data = (qaddr_t) pmp; 718 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 719 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 720 MNT_ILOCK(mp); 721 mp->mnt_flag |= MNT_LOCAL; 722 MNT_IUNLOCK(mp); 723 724 #ifdef MSDOSFS_LARGE 725 msdosfs_fileno_init(mp); 726 #endif 727 728 return 0; 729 730 error_exit: 731 if (bp) 732 brelse(bp); 733 if (cp != NULL) { 734 DROP_GIANT(); 735 g_topology_lock(); 736 g_vfs_close(cp, td); 737 g_topology_unlock(); 738 PICKUP_GIANT(); 739 } 740 if (pmp) { 741 if (pmp->pm_inusemap) 742 free(pmp->pm_inusemap, M_MSDOSFSFAT); 743 free(pmp, M_MSDOSFSMNT); 744 mp->mnt_data = (qaddr_t)0; 745 } 746 return (error); 747 } 748 749 /* 750 * Unmount the filesystem described by mp. 751 */ 752 static int 753 msdosfs_unmount(mp, mntflags, td) 754 struct mount *mp; 755 int mntflags; 756 struct thread *td; 757 { 758 struct msdosfsmount *pmp; 759 int error, flags; 760 761 flags = 0; 762 if (mntflags & MNT_FORCE) 763 flags |= FORCECLOSE; 764 error = vflush(mp, 0, flags, td); 765 if (error) 766 return error; 767 pmp = VFSTOMSDOSFS(mp); 768 if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) { 769 if (pmp->pm_w2u) 770 msdosfs_iconv->close(pmp->pm_w2u); 771 if (pmp->pm_u2w) 772 msdosfs_iconv->close(pmp->pm_u2w); 773 if (pmp->pm_d2u) 774 msdosfs_iconv->close(pmp->pm_d2u); 775 if (pmp->pm_u2d) 776 msdosfs_iconv->close(pmp->pm_u2d); 777 } 778 779 /* If the volume was mounted read/write, mark it clean now. */ 780 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) == 0) { 781 error = markvoldirty(pmp, 0); 782 if (error && (flags & FORCECLOSE) == 0) 783 return (error); 784 } 785 #ifdef MSDOSFS_DEBUG 786 { 787 struct vnode *vp = pmp->pm_devvp; 788 789 VI_LOCK(vp); 790 vn_printf(vp, 791 "msdosfs_umount(): just before calling VOP_CLOSE()\n"); 792 printf("freef %p, freeb %p, mount %p\n", 793 TAILQ_NEXT(vp, v_freelist), vp->v_freelist.tqe_prev, 794 vp->v_mount); 795 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %ld, type %d\n", 796 TAILQ_FIRST(&vp->v_bufobj.bo_clean.bv_hd), 797 TAILQ_FIRST(&vp->v_bufobj.bo_dirty.bv_hd), 798 vp->v_bufobj.bo_numoutput, vp->v_type); 799 VI_UNLOCK(vp); 800 } 801 #endif 802 DROP_GIANT(); 803 g_topology_lock(); 804 g_vfs_close(pmp->pm_cp, td); 805 g_topology_unlock(); 806 PICKUP_GIANT(); 807 vrele(pmp->pm_devvp); 808 free(pmp->pm_inusemap, M_MSDOSFSFAT); 809 #ifdef MSDOSFS_LARGE 810 msdosfs_fileno_free(mp); 811 #endif 812 free(pmp, M_MSDOSFSMNT); 813 mp->mnt_data = (qaddr_t)0; 814 MNT_ILOCK(mp); 815 mp->mnt_flag &= ~MNT_LOCAL; 816 MNT_IUNLOCK(mp); 817 return (error); 818 } 819 820 static int 821 msdosfs_root(mp, flags, vpp, td) 822 struct mount *mp; 823 int flags; 824 struct vnode **vpp; 825 struct thread *td; 826 { 827 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 828 struct denode *ndep; 829 int error; 830 831 #ifdef MSDOSFS_DEBUG 832 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 833 #endif 834 error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep); 835 if (error) 836 return (error); 837 *vpp = DETOV(ndep); 838 return (0); 839 } 840 841 static int 842 msdosfs_statfs(mp, sbp, td) 843 struct mount *mp; 844 struct statfs *sbp; 845 struct thread *td; 846 { 847 struct msdosfsmount *pmp; 848 849 pmp = VFSTOMSDOSFS(mp); 850 sbp->f_bsize = pmp->pm_bpcluster; 851 sbp->f_iosize = pmp->pm_bpcluster; 852 sbp->f_blocks = pmp->pm_maxcluster + 1; 853 sbp->f_bfree = pmp->pm_freeclustercount; 854 sbp->f_bavail = pmp->pm_freeclustercount; 855 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 856 sbp->f_ffree = 0; /* what to put in here? */ 857 return (0); 858 } 859 860 static int 861 msdosfs_sync(mp, waitfor, td) 862 struct mount *mp; 863 int waitfor; 864 struct thread *td; 865 { 866 struct vnode *vp, *nvp; 867 struct denode *dep; 868 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 869 int error, allerror = 0; 870 871 /* 872 * If we ever switch to not updating all of the fats all the time, 873 * this would be the place to update them from the first one. 874 */ 875 if (pmp->pm_fmod != 0) { 876 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 877 panic("msdosfs_sync: rofs mod"); 878 else { 879 /* update fats here */ 880 } 881 } 882 /* 883 * Write back each (modified) denode. 884 */ 885 MNT_ILOCK(mp); 886 loop: 887 MNT_VNODE_FOREACH(vp, mp, nvp) { 888 VI_LOCK(vp); 889 if (vp->v_type == VNON || (vp->v_iflag & VI_DOOMED)) { 890 VI_UNLOCK(vp); 891 continue; 892 } 893 MNT_IUNLOCK(mp); 894 dep = VTODE(vp); 895 if ((dep->de_flag & 896 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 && 897 (vp->v_bufobj.bo_dirty.bv_cnt == 0 || 898 waitfor == MNT_LAZY)) { 899 VI_UNLOCK(vp); 900 MNT_ILOCK(mp); 901 continue; 902 } 903 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td); 904 if (error) { 905 MNT_ILOCK(mp); 906 if (error == ENOENT) 907 goto loop; 908 continue; 909 } 910 error = VOP_FSYNC(vp, waitfor, td); 911 if (error) 912 allerror = error; 913 VOP_UNLOCK(vp, 0, td); 914 vrele(vp); 915 MNT_ILOCK(mp); 916 } 917 MNT_IUNLOCK(mp); 918 919 /* 920 * Flush filesystem control info. 921 */ 922 if (waitfor != MNT_LAZY) { 923 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY, td); 924 error = VOP_FSYNC(pmp->pm_devvp, waitfor, td); 925 if (error) 926 allerror = error; 927 VOP_UNLOCK(pmp->pm_devvp, 0, td); 928 } 929 return (allerror); 930 } 931 932 static int 933 msdosfs_fhtovp(mp, fhp, vpp) 934 struct mount *mp; 935 struct fid *fhp; 936 struct vnode **vpp; 937 { 938 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 939 struct defid *defhp = (struct defid *) fhp; 940 struct denode *dep; 941 int error; 942 943 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 944 if (error) { 945 *vpp = NULLVP; 946 return (error); 947 } 948 *vpp = DETOV(dep); 949 vnode_create_vobject(*vpp, dep->de_FileSize, curthread); 950 return (0); 951 } 952 953 static int 954 msdosfs_vptofh(vp, fhp) 955 struct vnode *vp; 956 struct fid *fhp; 957 { 958 struct denode *dep; 959 struct defid *defhp; 960 961 dep = VTODE(vp); 962 defhp = (struct defid *)fhp; 963 defhp->defid_len = sizeof(struct defid); 964 defhp->defid_dirclust = dep->de_dirclust; 965 defhp->defid_dirofs = dep->de_diroffset; 966 /* defhp->defid_gen = dep->de_gen; */ 967 return (0); 968 } 969 970 static struct vfsops msdosfs_vfsops = { 971 .vfs_fhtovp = msdosfs_fhtovp, 972 .vfs_mount = msdosfs_mount, 973 .vfs_cmount = msdosfs_cmount, 974 .vfs_root = msdosfs_root, 975 .vfs_statfs = msdosfs_statfs, 976 .vfs_sync = msdosfs_sync, 977 .vfs_unmount = msdosfs_unmount, 978 .vfs_vptofh = msdosfs_vptofh, 979 }; 980 981 VFS_SET(msdosfs_vfsops, msdosfs, 0); 982 MODULE_VERSION(msdosfs, 1); 983