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/proc.h> 56 #include <sys/kernel.h> 57 #include <sys/vnode.h> 58 #include <sys/mount.h> 59 #include <sys/bio.h> 60 #include <sys/buf.h> 61 #include <sys/fcntl.h> 62 #include <sys/malloc.h> 63 #include <sys/stat.h> /* defines ALLPERMS */ 64 #include <sys/iconv.h> 65 #include <sys/mutex.h> 66 67 #include <fs/msdosfs/bpb.h> 68 #include <fs/msdosfs/bootsect.h> 69 #include <fs/msdosfs/msdosfsmount.h> 70 #include <fs/msdosfs/direntry.h> 71 #include <fs/msdosfs/denode.h> 72 #include <fs/msdosfs/fat.h> 73 74 #include <geom/geom.h> 75 #include <geom/geom_vfs.h> 76 77 #include "opt_msdosfs.h" 78 79 /* List of mount options we support */ 80 static const char *msdosfs_opts[] = { 81 "from", 82 "export", "force", "sync", 83 "uid", "gid", "mask", "dirmask", 84 "shortname", "shortnames", "longname", "longnames", "nowin95", "win95", 85 "kiconv", "cs_win", "cs_dos", "cs_local", 86 NULL 87 }; 88 89 #define MSDOSFS_DFLTBSIZE 4096 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 = NULL; 106 107 static int update_mp(struct mount *mp, struct thread *td); 108 static int mountmsdosfs(struct vnode *devvp, struct mount *mp, 109 struct thread *td); 110 static vfs_fhtovp_t msdosfs_fhtovp; 111 static vfs_mount_t msdosfs_mount; 112 static vfs_root_t msdosfs_root; 113 static vfs_statfs_t msdosfs_statfs; 114 static vfs_sync_t msdosfs_sync; 115 static vfs_unmount_t msdosfs_unmount; 116 static vfs_vptofh_t msdosfs_vptofh; 117 118 /* Maximum length of a character set name (arbitrary). */ 119 #define MAXCSLEN 64 120 121 static int 122 update_mp(mp, td) 123 struct mount *mp; 124 struct thread *td; 125 { 126 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 127 void *dos, *win, *local; 128 int error, v; 129 130 if (!vfs_getopt(mp->mnt_optnew, "kiconv", NULL, NULL)) { 131 if (msdosfs_iconv != NULL) { 132 error = vfs_getopt(mp->mnt_optnew, 133 "cs_win", &win, NULL); 134 if (!error) 135 error = vfs_getopt(mp->mnt_optnew, 136 "cs_local", &local, NULL); 137 if (!error) 138 error = vfs_getopt(mp->mnt_optnew, 139 "cs_dos", &dos, NULL); 140 if (!error) { 141 msdosfs_iconv->open(win, local, &pmp->pm_u2w); 142 msdosfs_iconv->open(local, win, &pmp->pm_w2u); 143 msdosfs_iconv->open(dos, local, &pmp->pm_u2d); 144 msdosfs_iconv->open(local, dos, &pmp->pm_d2u); 145 } 146 if (error != 0) 147 return (error); 148 } else { 149 pmp->pm_w2u = NULL; 150 pmp->pm_u2w = NULL; 151 pmp->pm_d2u = NULL; 152 pmp->pm_u2d = NULL; 153 } 154 } 155 156 if (1 == vfs_scanopt(mp->mnt_optnew, "gid", "%d", &v)) 157 pmp->pm_gid = v; 158 if (1 == vfs_scanopt(mp->mnt_optnew, "uid", "%d", &v)) 159 pmp->pm_uid = v; 160 if (1 == vfs_scanopt(mp->mnt_optnew, "mask", "%d", &v)) 161 pmp->pm_mask = v & ALLPERMS; 162 if (1 == vfs_scanopt(mp->mnt_optnew, "dirmask", "%d", &v)) 163 pmp->pm_dirmask = v & ALLPERMS; 164 vfs_flagopt(mp->mnt_optnew, "shortname", 165 &pmp->pm_flags, MSDOSFSMNT_SHORTNAME); 166 vfs_flagopt(mp->mnt_optnew, "shortnames", 167 &pmp->pm_flags, MSDOSFSMNT_SHORTNAME); 168 vfs_flagopt(mp->mnt_optnew, "longname", 169 &pmp->pm_flags, MSDOSFSMNT_LONGNAME); 170 vfs_flagopt(mp->mnt_optnew, "longnames", 171 &pmp->pm_flags, MSDOSFSMNT_LONGNAME); 172 vfs_flagopt(mp->mnt_optnew, "kiconv", 173 &pmp->pm_flags, MSDOSFSMNT_KICONV); 174 175 if (vfs_getopt(mp->mnt_optnew, "nowin95", NULL, NULL) == 0) 176 pmp->pm_flags |= MSDOSFSMNT_NOWIN95; 177 else 178 pmp->pm_flags &= ~MSDOSFSMNT_NOWIN95; 179 180 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 181 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 182 else if (!(pmp->pm_flags & 183 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 184 struct vnode *rootvp; 185 186 /* 187 * Try to divine whether to support Win'95 long filenames 188 */ 189 if (FAT32(pmp)) 190 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 191 else { 192 if ((error = 193 msdosfs_root(mp, LK_EXCLUSIVE, &rootvp, td)) != 0) 194 return error; 195 pmp->pm_flags |= findwin95(VTODE(rootvp)) 196 ? MSDOSFSMNT_LONGNAME 197 : MSDOSFSMNT_SHORTNAME; 198 vput(rootvp); 199 } 200 } 201 return 0; 202 } 203 204 static int 205 msdosfs_cmount(struct mntarg *ma, void *data, int flags, struct thread *td) 206 { 207 struct msdosfs_args args; 208 int error; 209 210 if (data == NULL) 211 return (EINVAL); 212 error = copyin(data, &args, sizeof args); 213 if (error) 214 return (error); 215 216 ma = mount_argsu(ma, "from", args.fspec, MAXPATHLEN); 217 ma = mount_arg(ma, "export", &args.export, sizeof args.export); 218 ma = mount_argf(ma, "uid", "%d", args.uid); 219 ma = mount_argf(ma, "gid", "%d", args.gid); 220 ma = mount_argf(ma, "mask", "%d", args.mask); 221 ma = mount_argf(ma, "dirmask", "%d", args.dirmask); 222 223 ma = mount_argb(ma, args.flags & MSDOSFSMNT_SHORTNAME, "noshortname"); 224 ma = mount_argb(ma, args.flags & MSDOSFSMNT_LONGNAME, "nolongname"); 225 ma = mount_argb(ma, !(args.flags & MSDOSFSMNT_NOWIN95), "nowin95"); 226 ma = mount_argb(ma, args.flags & MSDOSFSMNT_KICONV, "nokiconv"); 227 228 ma = mount_argsu(ma, "cs_win", args.cs_win, MAXCSLEN); 229 ma = mount_argsu(ma, "cs_dos", args.cs_dos, MAXCSLEN); 230 ma = mount_argsu(ma, "cs_local", args.cs_local, MAXCSLEN); 231 232 error = kernel_mount(ma, flags); 233 234 return (error); 235 } 236 237 /* 238 * mp - path - addr in user space of mount point (ie /usr or whatever) 239 * data - addr in user space of mount params including the name of the block 240 * special file to treat as a filesystem. 241 */ 242 static int 243 msdosfs_mount(struct mount *mp, struct thread *td) 244 { 245 struct vnode *devvp; /* vnode for blk device to mount */ 246 /* msdosfs specific mount control block */ 247 struct msdosfsmount *pmp = NULL; 248 struct nameidata ndp; 249 int error, flags; 250 mode_t accessmode; 251 char *from; 252 253 if (vfs_filteropt(mp->mnt_optnew, msdosfs_opts)) 254 return (EINVAL); 255 256 /* 257 * If updating, check whether changing from read-only to 258 * read/write; if there is no device name, that's all we do. 259 */ 260 if (mp->mnt_flag & MNT_UPDATE) { 261 pmp = VFSTOMSDOSFS(mp); 262 263 if (vfs_flagopt(mp->mnt_optnew, "export", NULL, 0)) { 264 /* Process export requests. */ 265 if ((pmp->pm_flags & MSDOSFS_LARGEFS) != 0) 266 return (EOPNOTSUPP); 267 else 268 return (0); 269 } 270 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && 271 vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0)) { 272 error = VFS_SYNC(mp, MNT_WAIT, td); 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 DROP_GIANT(); 282 g_topology_lock(); 283 g_access(pmp->pm_cp, 0, -1, 0); 284 g_topology_unlock(); 285 PICKUP_GIANT(); 286 } else if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && 287 !vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0)) { 288 /* 289 * If upgrade to read-write by non-root, then verify 290 * that user has necessary permissions on the device. 291 */ 292 if (suser(td)) { 293 devvp = pmp->pm_devvp; 294 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 295 error = VOP_ACCESS(devvp, VREAD | VWRITE, 296 td->td_ucred, td); 297 if (error) { 298 VOP_UNLOCK(devvp, 0, td); 299 return (error); 300 } 301 VOP_UNLOCK(devvp, 0, td); 302 } 303 DROP_GIANT(); 304 g_topology_lock(); 305 error = g_access(pmp->pm_cp, 0, 1, 0); 306 g_topology_unlock(); 307 PICKUP_GIANT(); 308 if (error) 309 return (error); 310 311 /* Now that the volume is modifiable, mark it dirty. */ 312 error = markvoldirty(pmp, 1); 313 if (error) 314 return (error); 315 } 316 vfs_flagopt(mp->mnt_optnew, "ro", 317 &pmp->pm_flags, MSDOSFSMNT_RONLY); 318 vfs_flagopt(mp->mnt_optnew, "ro", 319 &mp->mnt_flag, MNT_RDONLY); 320 if (vfs_getopt(mp->mnt_optnew, "from", NULL, NULL)) { 321 #ifdef __notyet__ /* doesn't work correctly with current mountd XXX */ 322 if (args.flags & MSDOSFSMNT_MNTOPT) { 323 pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT; 324 pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT; 325 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 326 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 327 } 328 #endif 329 } 330 } 331 /* 332 * Not an update, or updating the name: look up the name 333 * and verify that it refers to a sensible disk device. 334 */ 335 if (vfs_getopt(mp->mnt_optnew, "from", (void **)&from, NULL)) 336 return (EINVAL); 337 NDINIT(&ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, from, td); 338 error = namei(&ndp); 339 if (error) 340 return (error); 341 devvp = ndp.ni_vp; 342 NDFREE(&ndp, NDF_ONLY_PNBUF); 343 344 if (!vn_isdisk(devvp, &error)) { 345 vput(devvp); 346 return (error); 347 } 348 /* 349 * If mount by non-root, then verify that user has necessary 350 * permissions on the device. 351 */ 352 if (suser(td)) { 353 accessmode = VREAD; 354 if ((mp->mnt_flag & MNT_RDONLY) == 0) 355 accessmode |= VWRITE; 356 error = VOP_ACCESS(devvp, accessmode, td->td_ucred, td); 357 if (error) { 358 vput(devvp); 359 return (error); 360 } 361 } 362 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 363 error = mountmsdosfs(devvp, mp, td); 364 #ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 365 pmp = VFSTOMSDOSFS(mp); 366 #endif 367 } else { 368 if (devvp != pmp->pm_devvp) 369 error = EINVAL; /* XXX needs translation */ 370 else 371 vput(devvp); 372 } 373 if (error) { 374 vrele(devvp); 375 return (error); 376 } 377 378 error = update_mp(mp, td); 379 if (error) { 380 if ((mp->mnt_flag & MNT_UPDATE) == 0) 381 msdosfs_unmount(mp, MNT_FORCE, td); 382 return error; 383 } 384 385 vfs_mountedfrom(mp, from); 386 #ifdef MSDOSFS_DEBUG 387 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 388 #endif 389 return (0); 390 } 391 392 static int 393 mountmsdosfs(devvp, mp, td) 394 struct vnode *devvp; 395 struct mount *mp; 396 struct thread *td; 397 { 398 struct msdosfsmount *pmp; 399 struct buf *bp; 400 struct cdev *dev = devvp->v_rdev; 401 union bootsector *bsp; 402 struct byte_bpb33 *b33; 403 struct byte_bpb50 *b50; 404 struct byte_bpb710 *b710; 405 u_int8_t SecPerClust; 406 u_long clusters; 407 int ronly, error; 408 struct g_consumer *cp; 409 struct bufobj *bo; 410 411 ronly = !vfs_getopt(mp->mnt_optnew, "ro", NULL, NULL); 412 /* XXX: use VOP_ACCESS to check FS perms */ 413 DROP_GIANT(); 414 g_topology_lock(); 415 error = g_vfs_open(devvp, &cp, "msdos", ronly ? 0 : 1); 416 g_topology_unlock(); 417 PICKUP_GIANT(); 418 VOP_UNLOCK(devvp, 0, td); 419 if (error) 420 return (error); 421 422 bo = &devvp->v_bufobj; 423 bp = NULL; /* both used in error_exit */ 424 pmp = NULL; 425 426 /* 427 * Read the boot sector of the filesystem, and then check the 428 * boot signature. If not a dos boot sector then error out. 429 * 430 * NOTE: 2048 is a maximum sector size in current... 431 */ 432 error = bread(devvp, 0, 2048, NOCRED, &bp); 433 if (error) 434 goto error_exit; 435 bp->b_flags |= B_AGE; 436 bsp = (union bootsector *)bp->b_data; 437 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 438 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 439 b710 = (struct byte_bpb710 *)bsp->bs710.bsBPB; 440 441 #ifndef MSDOSFS_NOCHECKSIG 442 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 443 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 444 error = EINVAL; 445 goto error_exit; 446 } 447 #endif 448 449 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK | M_ZERO); 450 pmp->pm_mountp = mp; 451 pmp->pm_cp = cp; 452 pmp->pm_bo = bo; 453 454 /* 455 * Compute several useful quantities from the bpb in the 456 * bootsector. Copy in the dos 5 variant of the bpb then fix up 457 * the fields that are different between dos 5 and dos 3.3. 458 */ 459 SecPerClust = b50->bpbSecPerClust; 460 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 461 if (pmp->pm_BytesPerSec < DEV_BSIZE) { 462 error = EINVAL; 463 goto error_exit; 464 } 465 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 466 pmp->pm_FATs = b50->bpbFATs; 467 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 468 pmp->pm_Sectors = getushort(b50->bpbSectors); 469 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 470 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 471 pmp->pm_Heads = getushort(b50->bpbHeads); 472 pmp->pm_Media = b50->bpbMedia; 473 474 /* calculate the ratio of sector size to DEV_BSIZE */ 475 pmp->pm_BlkPerSec = pmp->pm_BytesPerSec / DEV_BSIZE; 476 477 /* XXX - We should probably check more values here */ 478 if (!pmp->pm_BytesPerSec || !SecPerClust 479 || !pmp->pm_Heads 480 #ifdef PC98 481 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 255) { 482 #else 483 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 63) { 484 #endif 485 error = EINVAL; 486 goto error_exit; 487 } 488 489 if (pmp->pm_Sectors == 0) { 490 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 491 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 492 } else { 493 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 494 pmp->pm_HugeSectors = pmp->pm_Sectors; 495 } 496 #ifndef MSDOSFS_LARGE 497 if (pmp->pm_HugeSectors > 0xffffffff / 498 (pmp->pm_BytesPerSec / sizeof(struct direntry)) + 1) { 499 /* 500 * We cannot deal currently with this size of disk 501 * due to fileid limitations (see msdosfs_getattr and 502 * msdosfs_readdir) 503 */ 504 error = EINVAL; 505 printf("mountmsdosfs(): disk too big, sorry\n"); 506 goto error_exit; 507 } 508 #endif /* !MSDOSFS_LARGE */ 509 510 if (pmp->pm_RootDirEnts == 0) { 511 if (pmp->pm_Sectors 512 || pmp->pm_FATsecs 513 || getushort(b710->bpbFSVers)) { 514 error = EINVAL; 515 printf("mountmsdosfs(): bad FAT32 filesystem\n"); 516 goto error_exit; 517 } 518 pmp->pm_fatmask = FAT32_MASK; 519 pmp->pm_fatmult = 4; 520 pmp->pm_fatdiv = 1; 521 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 522 if (getushort(b710->bpbExtFlags) & FATMIRROR) 523 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 524 else 525 pmp->pm_flags |= MSDOSFS_FATMIRROR; 526 } else 527 pmp->pm_flags |= MSDOSFS_FATMIRROR; 528 529 /* 530 * Check a few values (could do some more): 531 * - logical sector size: power of 2, >= block size 532 * - sectors per cluster: power of 2, >= 1 533 * - number of sectors: >= 1, <= size of partition 534 * - number of FAT sectors: >= 1 535 */ 536 if ( (SecPerClust == 0) 537 || (SecPerClust & (SecPerClust - 1)) 538 || (pmp->pm_BytesPerSec < DEV_BSIZE) 539 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 540 || (pmp->pm_HugeSectors == 0) 541 || (pmp->pm_FATsecs == 0) 542 ) { 543 error = EINVAL; 544 goto error_exit; 545 } 546 547 pmp->pm_HugeSectors *= pmp->pm_BlkPerSec; 548 pmp->pm_HiddenSects *= pmp->pm_BlkPerSec; /* XXX not used? */ 549 pmp->pm_FATsecs *= pmp->pm_BlkPerSec; 550 SecPerClust *= pmp->pm_BlkPerSec; 551 552 pmp->pm_fatblk = pmp->pm_ResSectors * pmp->pm_BlkPerSec; 553 554 if (FAT32(pmp)) { 555 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 556 pmp->pm_firstcluster = pmp->pm_fatblk 557 + (pmp->pm_FATs * pmp->pm_FATsecs); 558 pmp->pm_fsinfo = getushort(b710->bpbFSInfo) * pmp->pm_BlkPerSec; 559 } else { 560 pmp->pm_rootdirblk = pmp->pm_fatblk + 561 (pmp->pm_FATs * pmp->pm_FATsecs); 562 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 563 + DEV_BSIZE - 1) 564 / DEV_BSIZE; /* in blocks */ 565 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 566 } 567 568 pmp->pm_maxcluster = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 569 SecPerClust + 1; 570 pmp->pm_fatsize = pmp->pm_FATsecs * DEV_BSIZE; /* XXX not used? */ 571 572 if (pmp->pm_fatmask == 0) { 573 if (pmp->pm_maxcluster 574 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 575 /* 576 * This will usually be a floppy disk. This size makes 577 * sure that one fat entry will not be split across 578 * multiple blocks. 579 */ 580 pmp->pm_fatmask = FAT12_MASK; 581 pmp->pm_fatmult = 3; 582 pmp->pm_fatdiv = 2; 583 } else { 584 pmp->pm_fatmask = FAT16_MASK; 585 pmp->pm_fatmult = 2; 586 pmp->pm_fatdiv = 1; 587 } 588 } 589 590 clusters = (pmp->pm_fatsize / pmp->pm_fatmult) * pmp->pm_fatdiv; 591 if (pmp->pm_maxcluster >= clusters) { 592 printf("Warning: number of clusters (%ld) exceeds FAT " 593 "capacity (%ld)\n", pmp->pm_maxcluster + 1, clusters); 594 pmp->pm_maxcluster = clusters - 1; 595 } 596 597 598 if (FAT12(pmp)) 599 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 600 else 601 pmp->pm_fatblocksize = MSDOSFS_DFLTBSIZE; 602 603 pmp->pm_fatblocksec = pmp->pm_fatblocksize / DEV_BSIZE; 604 pmp->pm_bnshift = ffs(DEV_BSIZE) - 1; 605 606 /* 607 * Compute mask and shift value for isolating cluster relative byte 608 * offsets and cluster numbers from a file offset. 609 */ 610 pmp->pm_bpcluster = SecPerClust * DEV_BSIZE; 611 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 612 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 613 614 /* 615 * Check for valid cluster size 616 * must be a power of 2 617 */ 618 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 619 error = EINVAL; 620 goto error_exit; 621 } 622 623 /* 624 * Release the bootsector buffer. 625 */ 626 brelse(bp); 627 bp = NULL; 628 629 /* 630 * Check FSInfo. 631 */ 632 if (pmp->pm_fsinfo) { 633 struct fsinfo *fp; 634 635 if ((error = bread(devvp, pmp->pm_fsinfo, fsi_size(pmp), 636 NOCRED, &bp)) != 0) 637 goto error_exit; 638 fp = (struct fsinfo *)bp->b_data; 639 if (!bcmp(fp->fsisig1, "RRaA", 4) 640 && !bcmp(fp->fsisig2, "rrAa", 4) 641 && !bcmp(fp->fsisig3, "\0\0\125\252", 4) 642 && !bcmp(fp->fsisig4, "\0\0\125\252", 4)) { 643 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 644 if (pmp->pm_nxtfree == 0xffffffff) 645 pmp->pm_nxtfree = CLUST_FIRST; 646 } else 647 pmp->pm_fsinfo = 0; 648 brelse(bp); 649 bp = NULL; 650 } 651 652 /* 653 * Check and validate (or perhaps invalidate?) the fsinfo structure? 654 */ 655 if (pmp->pm_fsinfo && pmp->pm_nxtfree > pmp->pm_maxcluster) { 656 printf( 657 "Next free cluster in FSInfo (%lu) exceeds maxcluster (%lu)\n", 658 pmp->pm_nxtfree, pmp->pm_maxcluster); 659 error = EINVAL; 660 goto error_exit; 661 } 662 663 /* 664 * Allocate memory for the bitmap of allocated clusters, and then 665 * fill it in. 666 */ 667 pmp->pm_inusemap = malloc(howmany(pmp->pm_maxcluster + 1, N_INUSEBITS) 668 * sizeof(*pmp->pm_inusemap), 669 M_MSDOSFSFAT, M_WAITOK); 670 671 /* 672 * fillinusemap() needs pm_devvp. 673 */ 674 pmp->pm_devvp = devvp; 675 676 /* 677 * Have the inuse map filled in. 678 */ 679 if ((error = fillinusemap(pmp)) != 0) 680 goto error_exit; 681 682 /* 683 * If they want fat updates to be synchronous then let them suffer 684 * the performance degradation in exchange for the on disk copy of 685 * the fat being correct just about all the time. I suppose this 686 * would be a good thing to turn on if the kernel is still flakey. 687 */ 688 if (mp->mnt_flag & MNT_SYNCHRONOUS) 689 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 690 691 /* 692 * Finish up. 693 */ 694 if (ronly) 695 pmp->pm_flags |= MSDOSFSMNT_RONLY; 696 else { 697 /* Mark the volume dirty while it is mounted read/write. */ 698 if ((error = markvoldirty(pmp, 1)) != 0) 699 goto error_exit; 700 pmp->pm_fmod = 1; 701 } 702 mp->mnt_data = (qaddr_t) pmp; 703 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 704 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 705 mp->mnt_flag |= MNT_LOCAL; 706 707 #ifdef MSDOSFS_LARGE 708 msdosfs_fileno_init(mp); 709 #endif 710 711 return 0; 712 713 error_exit: 714 if (bp) 715 brelse(bp); 716 if (cp != NULL) { 717 DROP_GIANT(); 718 g_topology_lock(); 719 g_vfs_close(cp, td); 720 g_topology_unlock(); 721 PICKUP_GIANT(); 722 } 723 if (pmp) { 724 if (pmp->pm_inusemap) 725 free(pmp->pm_inusemap, M_MSDOSFSFAT); 726 free(pmp, M_MSDOSFSMNT); 727 mp->mnt_data = (qaddr_t)0; 728 } 729 return (error); 730 } 731 732 /* 733 * Unmount the filesystem described by mp. 734 */ 735 static int 736 msdosfs_unmount(mp, mntflags, td) 737 struct mount *mp; 738 int mntflags; 739 struct thread *td; 740 { 741 struct msdosfsmount *pmp; 742 int error, flags; 743 744 flags = 0; 745 if (mntflags & MNT_FORCE) 746 flags |= FORCECLOSE; 747 error = vflush(mp, 0, flags, td); 748 if (error) 749 return error; 750 pmp = VFSTOMSDOSFS(mp); 751 if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) { 752 if (pmp->pm_w2u) 753 msdosfs_iconv->close(pmp->pm_w2u); 754 if (pmp->pm_u2w) 755 msdosfs_iconv->close(pmp->pm_u2w); 756 if (pmp->pm_d2u) 757 msdosfs_iconv->close(pmp->pm_d2u); 758 if (pmp->pm_u2d) 759 msdosfs_iconv->close(pmp->pm_u2d); 760 } 761 762 /* If the volume was mounted read/write, mark it clean now. */ 763 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) == 0) { 764 error = markvoldirty(pmp, 0); 765 if (error && (flags & FORCECLOSE) == 0) 766 return (error); 767 } 768 #ifdef MSDOSFS_DEBUG 769 { 770 struct vnode *vp = pmp->pm_devvp; 771 772 VI_LOCK(vp); 773 vn_printf(vp, 774 "msdosfs_umount(): just before calling VOP_CLOSE()\n"); 775 printf("freef %p, freeb %p, mount %p\n", 776 TAILQ_NEXT(vp, v_freelist), vp->v_freelist.tqe_prev, 777 vp->v_mount); 778 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %ld, type %d\n", 779 TAILQ_FIRST(&vp->v_bufobj.bo_clean.bv_hd), 780 TAILQ_FIRST(&vp->v_bufobj.bo_dirty.bv_hd), 781 vp->v_bufobj.bo_numoutput, vp->v_type); 782 VI_UNLOCK(vp); 783 } 784 #endif 785 DROP_GIANT(); 786 g_topology_lock(); 787 g_vfs_close(pmp->pm_cp, td); 788 g_topology_unlock(); 789 PICKUP_GIANT(); 790 vrele(pmp->pm_devvp); 791 free(pmp->pm_inusemap, M_MSDOSFSFAT); 792 #ifdef MSDOSFS_LARGE 793 msdosfs_fileno_free(mp); 794 #endif 795 free(pmp, M_MSDOSFSMNT); 796 mp->mnt_data = (qaddr_t)0; 797 mp->mnt_flag &= ~MNT_LOCAL; 798 return (error); 799 } 800 801 static int 802 msdosfs_root(mp, flags, vpp, td) 803 struct mount *mp; 804 int flags; 805 struct vnode **vpp; 806 struct thread *td; 807 { 808 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 809 struct denode *ndep; 810 int error; 811 812 #ifdef MSDOSFS_DEBUG 813 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 814 #endif 815 error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep); 816 if (error) 817 return (error); 818 *vpp = DETOV(ndep); 819 return (0); 820 } 821 822 static int 823 msdosfs_statfs(mp, sbp, td) 824 struct mount *mp; 825 struct statfs *sbp; 826 struct thread *td; 827 { 828 struct msdosfsmount *pmp; 829 830 pmp = VFSTOMSDOSFS(mp); 831 sbp->f_bsize = pmp->pm_bpcluster; 832 sbp->f_iosize = pmp->pm_bpcluster; 833 sbp->f_blocks = pmp->pm_maxcluster + 1; 834 sbp->f_bfree = pmp->pm_freeclustercount; 835 sbp->f_bavail = pmp->pm_freeclustercount; 836 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 837 sbp->f_ffree = 0; /* what to put in here? */ 838 return (0); 839 } 840 841 static int 842 msdosfs_sync(mp, waitfor, td) 843 struct mount *mp; 844 int waitfor; 845 struct thread *td; 846 { 847 struct vnode *vp, *nvp; 848 struct denode *dep; 849 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 850 int error, allerror = 0; 851 852 /* 853 * If we ever switch to not updating all of the fats all the time, 854 * this would be the place to update them from the first one. 855 */ 856 if (pmp->pm_fmod != 0) { 857 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 858 panic("msdosfs_sync: rofs mod"); 859 else { 860 /* update fats here */ 861 } 862 } 863 /* 864 * Write back each (modified) denode. 865 */ 866 MNT_ILOCK(mp); 867 loop: 868 MNT_VNODE_FOREACH(vp, mp, nvp) { 869 VI_LOCK(vp); 870 if (vp->v_type == VNON || (vp->v_iflag & VI_DOOMED)) { 871 VI_UNLOCK(vp); 872 continue; 873 } 874 MNT_IUNLOCK(mp); 875 dep = VTODE(vp); 876 if ((dep->de_flag & 877 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 && 878 (vp->v_bufobj.bo_dirty.bv_cnt == 0 || 879 waitfor == MNT_LAZY)) { 880 VI_UNLOCK(vp); 881 MNT_ILOCK(mp); 882 continue; 883 } 884 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td); 885 if (error) { 886 MNT_ILOCK(mp); 887 if (error == ENOENT) 888 goto loop; 889 continue; 890 } 891 error = VOP_FSYNC(vp, waitfor, td); 892 if (error) 893 allerror = error; 894 VOP_UNLOCK(vp, 0, td); 895 vrele(vp); 896 MNT_ILOCK(mp); 897 } 898 MNT_IUNLOCK(mp); 899 900 /* 901 * Flush filesystem control info. 902 */ 903 if (waitfor != MNT_LAZY) { 904 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY, td); 905 error = VOP_FSYNC(pmp->pm_devvp, waitfor, td); 906 if (error) 907 allerror = error; 908 VOP_UNLOCK(pmp->pm_devvp, 0, td); 909 } 910 return (allerror); 911 } 912 913 static int 914 msdosfs_fhtovp(mp, fhp, vpp) 915 struct mount *mp; 916 struct fid *fhp; 917 struct vnode **vpp; 918 { 919 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 920 struct defid *defhp = (struct defid *) fhp; 921 struct denode *dep; 922 int error; 923 924 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 925 if (error) { 926 *vpp = NULLVP; 927 return (error); 928 } 929 *vpp = DETOV(dep); 930 vnode_create_vobject(*vpp, dep->de_FileSize, curthread); 931 return (0); 932 } 933 934 static int 935 msdosfs_vptofh(vp, fhp) 936 struct vnode *vp; 937 struct fid *fhp; 938 { 939 struct denode *dep; 940 struct defid *defhp; 941 942 dep = VTODE(vp); 943 defhp = (struct defid *)fhp; 944 defhp->defid_len = sizeof(struct defid); 945 defhp->defid_dirclust = dep->de_dirclust; 946 defhp->defid_dirofs = dep->de_diroffset; 947 /* defhp->defid_gen = dep->de_gen; */ 948 return (0); 949 } 950 951 static struct vfsops msdosfs_vfsops = { 952 .vfs_fhtovp = msdosfs_fhtovp, 953 .vfs_mount = msdosfs_mount, 954 .vfs_cmount = msdosfs_cmount, 955 .vfs_root = msdosfs_root, 956 .vfs_statfs = msdosfs_statfs, 957 .vfs_sync = msdosfs_sync, 958 .vfs_unmount = msdosfs_unmount, 959 .vfs_vptofh = msdosfs_vptofh, 960 }; 961 962 VFS_SET(msdosfs_vfsops, msdosfs, 0); 963 MODULE_VERSION(msdosfs, 1); 964