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sys/fs/msdosfs/msdosfs_vfsops.c
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1 /* $FreeBSD: releng/6.4/sys/fs/msdosfs/msdosfs_vfsops.c 181729 2008-08-14 12:33:40Z kib $ */ 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 /* List of mount options we support */ 78 static const char *msdosfs_opts[] = { 79 "from", 80 "atime", "export", "force", "sync", 81 "uid", "gid", "mask", "dirmask", 82 "shortname", "shortnames", "longname", "longnames", "nowin95", "win95", 83 "kiconv", "cs_win", "cs_dos", "cs_local", "large", 84 NULL 85 }; 86 87 #define MSDOSFS_DFLTBSIZE 4096 88 89 #if 1 /*def PC98*/ 90 /* 91 * XXX - The boot signature formatted by NEC PC-98 DOS looks like a 92 * garbage or a random value :-{ 93 * If you want to use that broken-signatured media, define the 94 * following symbol even though PC/AT. 95 * (ex. mount PC-98 DOS formatted FD on PC/AT) 96 */ 97 #define MSDOSFS_NOCHECKSIG 98 #endif 99 100 MALLOC_DEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOSFS mount structure"); 101 static MALLOC_DEFINE(M_MSDOSFSFAT, "MSDOSFS FAT", "MSDOSFS file allocation table"); 102 103 struct iconv_functions *msdosfs_iconv = NULL; 104 105 static int update_mp(struct mount *mp, struct thread *td); 106 static int mountmsdosfs(struct vnode *devvp, struct mount *mp, 107 struct thread *td); 108 static vfs_fhtovp_t msdosfs_fhtovp; 109 static vfs_mount_t msdosfs_mount; 110 static vfs_root_t msdosfs_root; 111 static vfs_statfs_t msdosfs_statfs; 112 static vfs_sync_t msdosfs_sync; 113 static vfs_unmount_t msdosfs_unmount; 114 static vfs_vptofh_t msdosfs_vptofh; 115 116 /* Maximum length of a character set name (arbitrary). */ 117 #define MAXCSLEN 64 118 119 static int 120 update_mp(mp, td) 121 struct mount *mp; 122 struct thread *td; 123 { 124 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 125 void *dos, *win, *local; 126 int error, v; 127 128 if (!vfs_getopt(mp->mnt_optnew, "kiconv", NULL, NULL)) { 129 if (msdosfs_iconv != NULL) { 130 error = vfs_getopt(mp->mnt_optnew, 131 "cs_win", &win, NULL); 132 if (!error) 133 error = vfs_getopt(mp->mnt_optnew, 134 "cs_local", &local, NULL); 135 if (!error) 136 error = vfs_getopt(mp->mnt_optnew, 137 "cs_dos", &dos, NULL); 138 if (!error) { 139 msdosfs_iconv->open(win, local, &pmp->pm_u2w); 140 msdosfs_iconv->open(local, win, &pmp->pm_w2u); 141 msdosfs_iconv->open(dos, local, &pmp->pm_u2d); 142 msdosfs_iconv->open(local, dos, &pmp->pm_d2u); 143 } 144 if (error != 0) 145 return (error); 146 } else { 147 pmp->pm_w2u = NULL; 148 pmp->pm_u2w = NULL; 149 pmp->pm_d2u = NULL; 150 pmp->pm_u2d = NULL; 151 } 152 } 153 154 if (1 == vfs_scanopt(mp->mnt_optnew, "gid", "%d", &v)) 155 pmp->pm_gid = v; 156 if (1 == vfs_scanopt(mp->mnt_optnew, "uid", "%d", &v)) 157 pmp->pm_uid = v; 158 if (1 == vfs_scanopt(mp->mnt_optnew, "mask", "%d", &v)) 159 pmp->pm_mask = v & ALLPERMS; 160 if (1 == vfs_scanopt(mp->mnt_optnew, "dirmask", "%d", &v)) 161 pmp->pm_dirmask = v & ALLPERMS; 162 vfs_flagopt(mp->mnt_optnew, "shortname", 163 &pmp->pm_flags, MSDOSFSMNT_SHORTNAME); 164 vfs_flagopt(mp->mnt_optnew, "shortnames", 165 &pmp->pm_flags, MSDOSFSMNT_SHORTNAME); 166 vfs_flagopt(mp->mnt_optnew, "longname", 167 &pmp->pm_flags, MSDOSFSMNT_LONGNAME); 168 vfs_flagopt(mp->mnt_optnew, "longnames", 169 &pmp->pm_flags, MSDOSFSMNT_LONGNAME); 170 vfs_flagopt(mp->mnt_optnew, "kiconv", 171 &pmp->pm_flags, MSDOSFSMNT_KICONV); 172 173 if (vfs_getopt(mp->mnt_optnew, "nowin95", NULL, NULL) == 0) 174 pmp->pm_flags |= MSDOSFSMNT_NOWIN95; 175 else 176 pmp->pm_flags &= ~MSDOSFSMNT_NOWIN95; 177 178 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 179 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 180 else if (!(pmp->pm_flags & 181 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 182 struct vnode *rootvp; 183 184 /* 185 * Try to divine whether to support Win'95 long filenames 186 */ 187 if (FAT32(pmp)) 188 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 189 else { 190 if ((error = 191 msdosfs_root(mp, LK_EXCLUSIVE, &rootvp, td)) != 0) 192 return error; 193 pmp->pm_flags |= findwin95(VTODE(rootvp)) 194 ? MSDOSFSMNT_LONGNAME 195 : MSDOSFSMNT_SHORTNAME; 196 vput(rootvp); 197 } 198 } 199 return 0; 200 } 201 202 static int 203 msdosfs_cmount(struct mntarg *ma, void *data, int flags, struct thread *td) 204 { 205 struct msdosfs_args args; 206 int error; 207 208 if (data == NULL) 209 return (EINVAL); 210 error = copyin(data, &args, sizeof args); 211 if (error) 212 return (error); 213 214 ma = mount_argsu(ma, "from", args.fspec, MAXPATHLEN); 215 ma = mount_arg(ma, "export", &args.export, sizeof args.export); 216 ma = mount_argf(ma, "uid", "%d", args.uid); 217 ma = mount_argf(ma, "gid", "%d", args.gid); 218 ma = mount_argf(ma, "mask", "%d", args.mask); 219 ma = mount_argf(ma, "dirmask", "%d", args.dirmask); 220 221 ma = mount_argb(ma, args.flags & MSDOSFSMNT_SHORTNAME, "noshortname"); 222 ma = mount_argb(ma, args.flags & MSDOSFSMNT_LONGNAME, "nolongname"); 223 ma = mount_argb(ma, !(args.flags & MSDOSFSMNT_NOWIN95), "nowin95"); 224 ma = mount_argb(ma, args.flags & MSDOSFSMNT_KICONV, "nokiconv"); 225 226 ma = mount_argsu(ma, "cs_win", args.cs_win, MAXCSLEN); 227 ma = mount_argsu(ma, "cs_dos", args.cs_dos, MAXCSLEN); 228 ma = mount_argsu(ma, "cs_local", args.cs_local, MAXCSLEN); 229 230 error = kernel_mount(ma, flags); 231 232 return (error); 233 } 234 235 /* 236 * mp - path - addr in user space of mount point (ie /usr or whatever) 237 * data - addr in user space of mount params including the name of the block 238 * special file to treat as a filesystem. 239 */ 240 static int 241 msdosfs_mount(struct mount *mp, struct thread *td) 242 { 243 struct vnode *devvp; /* vnode for blk device to mount */ 244 /* msdosfs specific mount control block */ 245 struct msdosfsmount *pmp = NULL; 246 struct nameidata ndp; 247 int error, flags; 248 mode_t accessmode; 249 char *from; 250 251 if (vfs_filteropt(mp->mnt_optnew, msdosfs_opts)) 252 return (EINVAL); 253 254 /* 255 * If updating, check whether changing from read-only to 256 * read/write; if there is no device name, that's all we do. 257 */ 258 if (mp->mnt_flag & MNT_UPDATE) { 259 int ro_to_rw = 0; 260 pmp = VFSTOMSDOSFS(mp); 261 262 if (vfs_flagopt(mp->mnt_optnew, "export", NULL, 0)) { 263 /* 264 * Forbid export requests if filesystem has 265 * MSDOSFS_LARGEFS flag set. 266 */ 267 if ((pmp->pm_flags & MSDOSFS_LARGEFS) != 0) 268 return (EOPNOTSUPP); 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 /* Now the volume is clean. Mark it. */ 287 error = markvoldirty(pmp, 0); 288 if (error && (flags & FORCECLOSE) == 0) 289 return (error); 290 } else if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && 291 !vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0)) { 292 /* 293 * If upgrade to read-write by non-root, then verify 294 * that user has necessary permissions on the device. 295 */ 296 if (suser(td)) { 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 VOP_UNLOCK(devvp, 0, td); 303 return (error); 304 } 305 VOP_UNLOCK(devvp, 0, td); 306 } 307 DROP_GIANT(); 308 g_topology_lock(); 309 error = g_access(pmp->pm_cp, 0, 1, 0); 310 g_topology_unlock(); 311 PICKUP_GIANT(); 312 if (error) 313 return (error); 314 315 ro_to_rw = 1; 316 } 317 vfs_flagopt(mp->mnt_optnew, "ro", 318 &pmp->pm_flags, MSDOSFSMNT_RONLY); 319 vfs_flagopt(mp->mnt_optnew, "ro", 320 &mp->mnt_flag, MNT_RDONLY); 321 322 if (ro_to_rw) { 323 /* Now that the volume is modifiable, mark it dirty. */ 324 error = markvoldirty(pmp, 1); 325 if (error) 326 return (error); 327 } 328 329 if (vfs_getopt(mp->mnt_optnew, "from", NULL, NULL)) { 330 #ifdef __notyet__ /* doesn't work correctly with current mountd XXX */ 331 if (args.flags & MSDOSFSMNT_MNTOPT) { 332 pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT; 333 pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT; 334 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 335 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 336 } 337 #endif 338 } 339 } 340 /* 341 * Not an update, or updating the name: look up the name 342 * and verify that it refers to a sensible disk device. 343 */ 344 if (vfs_getopt(mp->mnt_optnew, "from", (void **)&from, NULL)) 345 return (EINVAL); 346 NDINIT(&ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, from, td); 347 error = namei(&ndp); 348 if (error) 349 return (error); 350 devvp = ndp.ni_vp; 351 NDFREE(&ndp, NDF_ONLY_PNBUF); 352 353 if (!vn_isdisk(devvp, &error)) { 354 vput(devvp); 355 return (error); 356 } 357 /* 358 * If mount by non-root, then verify that user has necessary 359 * permissions on the device. 360 */ 361 if (suser(td)) { 362 accessmode = VREAD; 363 if ((mp->mnt_flag & MNT_RDONLY) == 0) 364 accessmode |= VWRITE; 365 error = VOP_ACCESS(devvp, accessmode, td->td_ucred, td); 366 if (error) { 367 vput(devvp); 368 return (error); 369 } 370 } 371 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 372 error = mountmsdosfs(devvp, mp, td); 373 #ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 374 pmp = VFSTOMSDOSFS(mp); 375 #endif 376 } else { 377 if (devvp != pmp->pm_devvp) 378 error = EINVAL; /* XXX needs translation */ 379 else 380 vput(devvp); 381 } 382 if (error) { 383 vrele(devvp); 384 return (error); 385 } 386 387 error = update_mp(mp, td); 388 if (error) { 389 if ((mp->mnt_flag & MNT_UPDATE) == 0) 390 msdosfs_unmount(mp, MNT_FORCE, td); 391 return error; 392 } 393 394 vfs_mountedfrom(mp, from); 395 #ifdef MSDOSFS_DEBUG 396 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 397 #endif 398 return (0); 399 } 400 401 static int 402 mountmsdosfs(devvp, mp, td) 403 struct vnode *devvp; 404 struct mount *mp; 405 struct thread *td; 406 { 407 struct msdosfsmount *pmp; 408 struct buf *bp; 409 struct cdev *dev = devvp->v_rdev; 410 union bootsector *bsp; 411 struct byte_bpb33 *b33; 412 struct byte_bpb50 *b50; 413 struct byte_bpb710 *b710; 414 u_int8_t SecPerClust; 415 u_long clusters; 416 int ronly, error; 417 struct g_consumer *cp; 418 struct bufobj *bo; 419 420 ronly = !vfs_getopt(mp->mnt_optnew, "ro", NULL, NULL); 421 /* XXX: use VOP_ACCESS to check FS perms */ 422 DROP_GIANT(); 423 g_topology_lock(); 424 error = g_vfs_open(devvp, &cp, "msdos", ronly ? 0 : 1); 425 g_topology_unlock(); 426 PICKUP_GIANT(); 427 VOP_UNLOCK(devvp, 0, td); 428 if (error) 429 return (error); 430 431 bo = &devvp->v_bufobj; 432 bp = NULL; /* both used in error_exit */ 433 pmp = NULL; 434 435 /* 436 * Read the boot sector of the filesystem, and then check the 437 * boot signature. If not a dos boot sector then error out. 438 * 439 * NOTE: 2048 is a maximum sector size in current... 440 */ 441 error = bread(devvp, 0, 2048, NOCRED, &bp); 442 if (error) 443 goto error_exit; 444 bp->b_flags |= B_AGE; 445 bsp = (union bootsector *)bp->b_data; 446 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 447 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 448 b710 = (struct byte_bpb710 *)bsp->bs710.bsBPB; 449 450 #ifndef MSDOSFS_NOCHECKSIG 451 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 452 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 453 error = EINVAL; 454 goto error_exit; 455 } 456 #endif 457 458 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK | M_ZERO); 459 pmp->pm_mountp = mp; 460 pmp->pm_cp = cp; 461 pmp->pm_bo = bo; 462 463 /* 464 * Experimental support for large MS-DOS filesystems. 465 * WARNING: This uses at least 32 bytes of kernel memory (which is not 466 * reclaimed until the FS is unmounted) for each file on disk to map 467 * between the 32-bit inode numbers used by VFS and the 64-bit 468 * pseudo-inode numbers used internally by msdosfs. This is only 469 * safe to use in certain controlled situations (e.g. read-only FS 470 * with less than 1 million files). 471 * Since the mappings do not persist across unmounts (or reboots), these 472 * filesystems are not suitable for exporting through NFS, or any other 473 * application that requires fixed inode numbers. 474 */ 475 vfs_flagopt(mp->mnt_optnew, "large", &pmp->pm_flags, 476 MSDOSFS_LARGEFS); 477 478 /* 479 * Compute several useful quantities from the bpb in the 480 * bootsector. Copy in the dos 5 variant of the bpb then fix up 481 * the fields that are different between dos 5 and dos 3.3. 482 */ 483 SecPerClust = b50->bpbSecPerClust; 484 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 485 if (pmp->pm_BytesPerSec < DEV_BSIZE) { 486 error = EINVAL; 487 goto error_exit; 488 } 489 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 490 pmp->pm_FATs = b50->bpbFATs; 491 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 492 pmp->pm_Sectors = getushort(b50->bpbSectors); 493 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 494 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 495 pmp->pm_Heads = getushort(b50->bpbHeads); 496 pmp->pm_Media = b50->bpbMedia; 497 498 /* calculate the ratio of sector size to DEV_BSIZE */ 499 pmp->pm_BlkPerSec = pmp->pm_BytesPerSec / DEV_BSIZE; 500 501 /* 502 * We don't check pm_Heads nor pm_SecPerTrack, because 503 * these may not be set for EFI file systems. We don't 504 * use these anyway, so we're unaffected if they are 505 * invalid. 506 */ 507 if (!pmp->pm_BytesPerSec || !SecPerClust) { 508 error = EINVAL; 509 goto error_exit; 510 } 511 512 if (pmp->pm_Sectors == 0) { 513 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 514 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 515 } else { 516 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 517 pmp->pm_HugeSectors = pmp->pm_Sectors; 518 } 519 if (!(pmp->pm_flags & MSDOSFS_LARGEFS)) { 520 if (pmp->pm_HugeSectors > 0xffffffff / 521 (pmp->pm_BytesPerSec / sizeof(struct direntry)) + 1) { 522 /* 523 * We cannot deal currently with this size of disk 524 * due to fileid limitations (see msdosfs_getattr and 525 * msdosfs_readdir) 526 */ 527 error = EINVAL; 528 vfs_mount_error(mp, 529 "Disk too big, try '-o large' mount option"); 530 printf("Disk too big, try '-o large' mount option\n"); 531 goto error_exit; 532 } 533 } 534 535 if (pmp->pm_RootDirEnts == 0) { 536 if (pmp->pm_Sectors 537 || pmp->pm_FATsecs 538 || getushort(b710->bpbFSVers)) { 539 error = EINVAL; 540 printf("mountmsdosfs(): bad FAT32 filesystem\n"); 541 goto error_exit; 542 } 543 pmp->pm_fatmask = FAT32_MASK; 544 pmp->pm_fatmult = 4; 545 pmp->pm_fatdiv = 1; 546 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 547 if (getushort(b710->bpbExtFlags) & FATMIRROR) 548 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 549 else 550 pmp->pm_flags |= MSDOSFS_FATMIRROR; 551 } else 552 pmp->pm_flags |= MSDOSFS_FATMIRROR; 553 554 /* 555 * Check a few values (could do some more): 556 * - logical sector size: power of 2, >= block size 557 * - sectors per cluster: power of 2, >= 1 558 * - number of sectors: >= 1, <= size of partition 559 * - number of FAT sectors: >= 1 560 */ 561 if ( (SecPerClust == 0) 562 || (SecPerClust & (SecPerClust - 1)) 563 || (pmp->pm_BytesPerSec < DEV_BSIZE) 564 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 565 || (pmp->pm_HugeSectors == 0) 566 || (pmp->pm_FATsecs == 0) 567 ) { 568 error = EINVAL; 569 goto error_exit; 570 } 571 572 pmp->pm_HugeSectors *= pmp->pm_BlkPerSec; 573 pmp->pm_HiddenSects *= pmp->pm_BlkPerSec; /* XXX not used? */ 574 pmp->pm_FATsecs *= pmp->pm_BlkPerSec; 575 SecPerClust *= pmp->pm_BlkPerSec; 576 577 pmp->pm_fatblk = pmp->pm_ResSectors * pmp->pm_BlkPerSec; 578 579 if (FAT32(pmp)) { 580 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 581 pmp->pm_firstcluster = pmp->pm_fatblk 582 + (pmp->pm_FATs * pmp->pm_FATsecs); 583 pmp->pm_fsinfo = getushort(b710->bpbFSInfo) * pmp->pm_BlkPerSec; 584 } else { 585 pmp->pm_rootdirblk = pmp->pm_fatblk + 586 (pmp->pm_FATs * pmp->pm_FATsecs); 587 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 588 + DEV_BSIZE - 1) 589 / DEV_BSIZE; /* in blocks */ 590 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 591 } 592 593 pmp->pm_maxcluster = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 594 SecPerClust + 1; 595 pmp->pm_fatsize = pmp->pm_FATsecs * DEV_BSIZE; /* XXX not used? */ 596 597 if (pmp->pm_fatmask == 0) { 598 if (pmp->pm_maxcluster 599 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 600 /* 601 * This will usually be a floppy disk. This size makes 602 * sure that one fat entry will not be split across 603 * multiple blocks. 604 */ 605 pmp->pm_fatmask = FAT12_MASK; 606 pmp->pm_fatmult = 3; 607 pmp->pm_fatdiv = 2; 608 } else { 609 pmp->pm_fatmask = FAT16_MASK; 610 pmp->pm_fatmult = 2; 611 pmp->pm_fatdiv = 1; 612 } 613 } 614 615 clusters = (pmp->pm_fatsize / pmp->pm_fatmult) * pmp->pm_fatdiv; 616 if (pmp->pm_maxcluster >= clusters) { 617 printf("Warning: number of clusters (%ld) exceeds FAT " 618 "capacity (%ld)\n", pmp->pm_maxcluster + 1, clusters); 619 pmp->pm_maxcluster = clusters - 1; 620 } 621 622 623 if (FAT12(pmp)) 624 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 625 else 626 pmp->pm_fatblocksize = MSDOSFS_DFLTBSIZE; 627 628 pmp->pm_fatblocksec = pmp->pm_fatblocksize / DEV_BSIZE; 629 pmp->pm_bnshift = ffs(DEV_BSIZE) - 1; 630 631 /* 632 * Compute mask and shift value for isolating cluster relative byte 633 * offsets and cluster numbers from a file offset. 634 */ 635 pmp->pm_bpcluster = SecPerClust * DEV_BSIZE; 636 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 637 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 638 639 /* 640 * Check for valid cluster size 641 * must be a power of 2 642 */ 643 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 644 error = EINVAL; 645 goto error_exit; 646 } 647 648 /* 649 * Release the bootsector buffer. 650 */ 651 brelse(bp); 652 bp = NULL; 653 654 /* 655 * Check FSInfo. 656 */ 657 if (pmp->pm_fsinfo) { 658 struct fsinfo *fp; 659 660 if ((error = bread(devvp, pmp->pm_fsinfo, fsi_size(pmp), 661 NOCRED, &bp)) != 0) 662 goto error_exit; 663 fp = (struct fsinfo *)bp->b_data; 664 if (!bcmp(fp->fsisig1, "RRaA", 4) 665 && !bcmp(fp->fsisig2, "rrAa", 4) 666 && !bcmp(fp->fsisig3, "\0\0\125\252", 4) 667 && !bcmp(fp->fsisig4, "\0\0\125\252", 4)) { 668 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 669 if (pmp->pm_nxtfree == 0xffffffff) 670 pmp->pm_nxtfree = CLUST_FIRST; 671 } else 672 pmp->pm_fsinfo = 0; 673 brelse(bp); 674 bp = NULL; 675 } 676 677 /* 678 * Check and validate (or perhaps invalidate?) the fsinfo structure? 679 */ 680 if (pmp->pm_fsinfo && pmp->pm_nxtfree > pmp->pm_maxcluster) { 681 printf( 682 "Next free cluster in FSInfo (%lu) exceeds maxcluster (%lu)\n", 683 pmp->pm_nxtfree, pmp->pm_maxcluster); 684 error = EINVAL; 685 goto error_exit; 686 } 687 688 /* 689 * Allocate memory for the bitmap of allocated clusters, and then 690 * fill it in. 691 */ 692 pmp->pm_inusemap = malloc(howmany(pmp->pm_maxcluster + 1, N_INUSEBITS) 693 * sizeof(*pmp->pm_inusemap), 694 M_MSDOSFSFAT, M_WAITOK); 695 696 /* 697 * fillinusemap() needs pm_devvp. 698 */ 699 pmp->pm_devvp = devvp; 700 701 /* 702 * Have the inuse map filled in. 703 */ 704 if ((error = fillinusemap(pmp)) != 0) 705 goto error_exit; 706 707 /* 708 * If they want fat updates to be synchronous then let them suffer 709 * the performance degradation in exchange for the on disk copy of 710 * the fat being correct just about all the time. I suppose this 711 * would be a good thing to turn on if the kernel is still flakey. 712 */ 713 if (mp->mnt_flag & MNT_SYNCHRONOUS) 714 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 715 716 /* 717 * Finish up. 718 */ 719 if (ronly) 720 pmp->pm_flags |= MSDOSFSMNT_RONLY; 721 else { 722 /* Mark the volume dirty while it is mounted read/write. */ 723 if ((error = markvoldirty(pmp, 1)) != 0) 724 goto error_exit; 725 pmp->pm_fmod = 1; 726 } 727 mp->mnt_data = (qaddr_t) pmp; 728 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 729 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 730 MNT_ILOCK(mp); 731 mp->mnt_flag |= MNT_LOCAL; 732 MNT_IUNLOCK(mp); 733 734 if (pmp->pm_flags & MSDOSFS_LARGEFS) 735 msdosfs_fileno_init(mp); 736 737 return 0; 738 739 error_exit: 740 if (bp) 741 brelse(bp); 742 if (cp != NULL) { 743 DROP_GIANT(); 744 g_topology_lock(); 745 g_vfs_close(cp, td); 746 g_topology_unlock(); 747 PICKUP_GIANT(); 748 } 749 if (pmp) { 750 if (pmp->pm_inusemap) 751 free(pmp->pm_inusemap, M_MSDOSFSFAT); 752 free(pmp, M_MSDOSFSMNT); 753 mp->mnt_data = (qaddr_t)0; 754 } 755 return (error); 756 } 757 758 /* 759 * Unmount the filesystem described by mp. 760 */ 761 static int 762 msdosfs_unmount(mp, mntflags, td) 763 struct mount *mp; 764 int mntflags; 765 struct thread *td; 766 { 767 struct msdosfsmount *pmp; 768 int error, flags; 769 770 flags = 0; 771 if (mntflags & MNT_FORCE) 772 flags |= FORCECLOSE; 773 error = vflush(mp, 0, flags, td); 774 if (error) 775 return error; 776 pmp = VFSTOMSDOSFS(mp); 777 if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) { 778 if (pmp->pm_w2u) 779 msdosfs_iconv->close(pmp->pm_w2u); 780 if (pmp->pm_u2w) 781 msdosfs_iconv->close(pmp->pm_u2w); 782 if (pmp->pm_d2u) 783 msdosfs_iconv->close(pmp->pm_d2u); 784 if (pmp->pm_u2d) 785 msdosfs_iconv->close(pmp->pm_u2d); 786 } 787 788 /* If the volume was mounted read/write, mark it clean now. */ 789 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) == 0) { 790 error = markvoldirty(pmp, 0); 791 if (error && (flags & FORCECLOSE) == 0) 792 return (error); 793 } 794 #ifdef MSDOSFS_DEBUG 795 { 796 struct vnode *vp = pmp->pm_devvp; 797 798 VI_LOCK(vp); 799 vn_printf(vp, 800 "msdosfs_umount(): just before calling VOP_CLOSE()\n"); 801 printf("freef %p, freeb %p, mount %p\n", 802 TAILQ_NEXT(vp, v_freelist), vp->v_freelist.tqe_prev, 803 vp->v_mount); 804 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %ld, type %d\n", 805 TAILQ_FIRST(&vp->v_bufobj.bo_clean.bv_hd), 806 TAILQ_FIRST(&vp->v_bufobj.bo_dirty.bv_hd), 807 vp->v_bufobj.bo_numoutput, vp->v_type); 808 VI_UNLOCK(vp); 809 } 810 #endif 811 DROP_GIANT(); 812 g_topology_lock(); 813 g_vfs_close(pmp->pm_cp, td); 814 g_topology_unlock(); 815 PICKUP_GIANT(); 816 vrele(pmp->pm_devvp); 817 free(pmp->pm_inusemap, M_MSDOSFSFAT); 818 if (pmp->pm_flags & MSDOSFS_LARGEFS) { 819 msdosfs_fileno_free(mp); 820 } 821 free(pmp, M_MSDOSFSMNT); 822 mp->mnt_data = (qaddr_t)0; 823 MNT_ILOCK(mp); 824 mp->mnt_flag &= ~MNT_LOCAL; 825 MNT_IUNLOCK(mp); 826 return (error); 827 } 828 829 static int 830 msdosfs_root(mp, flags, vpp, td) 831 struct mount *mp; 832 int flags; 833 struct vnode **vpp; 834 struct thread *td; 835 { 836 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 837 struct denode *ndep; 838 int error; 839 840 #ifdef MSDOSFS_DEBUG 841 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 842 #endif 843 error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep); 844 if (error) 845 return (error); 846 *vpp = DETOV(ndep); 847 return (0); 848 } 849 850 static int 851 msdosfs_statfs(mp, sbp, td) 852 struct mount *mp; 853 struct statfs *sbp; 854 struct thread *td; 855 { 856 struct msdosfsmount *pmp; 857 858 pmp = VFSTOMSDOSFS(mp); 859 sbp->f_bsize = pmp->pm_bpcluster; 860 sbp->f_iosize = pmp->pm_bpcluster; 861 sbp->f_blocks = pmp->pm_maxcluster + 1; 862 sbp->f_bfree = pmp->pm_freeclustercount; 863 sbp->f_bavail = pmp->pm_freeclustercount; 864 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 865 sbp->f_ffree = 0; /* what to put in here? */ 866 return (0); 867 } 868 869 static int 870 msdosfs_sync(mp, waitfor, td) 871 struct mount *mp; 872 int waitfor; 873 struct thread *td; 874 { 875 struct vnode *vp, *nvp; 876 struct denode *dep; 877 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 878 int error, allerror = 0; 879 880 /* 881 * If we ever switch to not updating all of the fats all the time, 882 * this would be the place to update them from the first one. 883 */ 884 if (pmp->pm_fmod != 0) { 885 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 886 panic("msdosfs_sync: rofs mod"); 887 else { 888 /* update fats here */ 889 } 890 } 891 /* 892 * Write back each (modified) denode. 893 */ 894 MNT_ILOCK(mp); 895 loop: 896 MNT_VNODE_FOREACH(vp, mp, nvp) { 897 VI_LOCK(vp); 898 if (vp->v_type == VNON || (vp->v_iflag & VI_DOOMED)) { 899 VI_UNLOCK(vp); 900 continue; 901 } 902 MNT_IUNLOCK(mp); 903 dep = VTODE(vp); 904 if ((dep->de_flag & 905 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 && 906 (vp->v_bufobj.bo_dirty.bv_cnt == 0 || 907 waitfor == MNT_LAZY)) { 908 VI_UNLOCK(vp); 909 MNT_ILOCK(mp); 910 continue; 911 } 912 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td); 913 if (error) { 914 MNT_ILOCK(mp); 915 if (error == ENOENT) 916 goto loop; 917 continue; 918 } 919 error = VOP_FSYNC(vp, waitfor, td); 920 if (error) 921 allerror = error; 922 VOP_UNLOCK(vp, 0, td); 923 vrele(vp); 924 MNT_ILOCK(mp); 925 } 926 MNT_IUNLOCK(mp); 927 928 /* 929 * Flush filesystem control info. 930 */ 931 if (waitfor != MNT_LAZY) { 932 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY, td); 933 error = VOP_FSYNC(pmp->pm_devvp, waitfor, td); 934 if (error) 935 allerror = error; 936 VOP_UNLOCK(pmp->pm_devvp, 0, td); 937 } 938 return (allerror); 939 } 940 941 static int 942 msdosfs_fhtovp(mp, fhp, vpp) 943 struct mount *mp; 944 struct fid *fhp; 945 struct vnode **vpp; 946 { 947 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 948 struct defid *defhp = (struct defid *) fhp; 949 struct denode *dep; 950 int error; 951 952 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 953 if (error) { 954 *vpp = NULLVP; 955 return (error); 956 } 957 *vpp = DETOV(dep); 958 vnode_create_vobject_off(*vpp, dep->de_FileSize, curthread); 959 return (0); 960 } 961 962 static int 963 msdosfs_vptofh(vp, fhp) 964 struct vnode *vp; 965 struct fid *fhp; 966 { 967 struct denode *dep; 968 struct defid *defhp; 969 970 dep = VTODE(vp); 971 defhp = (struct defid *)fhp; 972 defhp->defid_len = sizeof(struct defid); 973 defhp->defid_dirclust = dep->de_dirclust; 974 defhp->defid_dirofs = dep->de_diroffset; 975 /* defhp->defid_gen = dep->de_gen; */ 976 return (0); 977 } 978 979 static struct vfsops msdosfs_vfsops = { 980 .vfs_fhtovp = msdosfs_fhtovp, 981 .vfs_mount = msdosfs_mount, 982 .vfs_cmount = msdosfs_cmount, 983 .vfs_root = msdosfs_root, 984 .vfs_statfs = msdosfs_statfs, 985 .vfs_sync = msdosfs_sync, 986 .vfs_unmount = msdosfs_unmount, 987 .vfs_vptofh = msdosfs_vptofh, 988 }; 989 990 VFS_SET(msdosfs_vfsops, msdosfs, 0); 991 MODULE_VERSION(msdosfs, 1);
Cache object: 2fbd4f8f1e568417c23ea37ffdf19813
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