msdosfs_vfsops.c revision 166343
1/* $FreeBSD: head/sys/fs/msdosfs/msdosfs_vfsops.c 166343 2007-01-30 08:05:04Z avatar $ */ 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 */ 79static const char *msdosfs_opts[] = { 80 "from", 81 "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 101MALLOC_DEFINE(M_MSDOSFSMNT, "msdosfs_mount", "MSDOSFS mount structure"); 102static MALLOC_DEFINE(M_MSDOSFSFAT, "msdosfs_fat", "MSDOSFS file allocation table"); 103 104struct iconv_functions *msdosfs_iconv = NULL; 105 106static int update_mp(struct mount *mp, struct thread *td); 107static int mountmsdosfs(struct vnode *devvp, struct mount *mp, 108 struct thread *td); 109static vfs_fhtovp_t msdosfs_fhtovp; 110static vfs_mount_t msdosfs_mount; 111static vfs_root_t msdosfs_root; 112static vfs_statfs_t msdosfs_statfs; 113static vfs_sync_t msdosfs_sync; 114static vfs_unmount_t msdosfs_unmount; 115static vfs_vptofh_t msdosfs_vptofh; 116 117/* Maximum length of a character set name (arbitrary). */ 118#define MAXCSLEN 64 119 120static int 121update_mp(mp, td) 122 struct mount *mp; 123 struct thread *td; 124{ 125 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 126 void *dos, *win, *local; 127 int error, v; 128 129 if (!vfs_getopt(mp->mnt_optnew, "kiconv", NULL, NULL)) { 130 if (msdosfs_iconv != NULL) { 131 error = vfs_getopt(mp->mnt_optnew, 132 "cs_win", &win, NULL); 133 if (!error) 134 error = vfs_getopt(mp->mnt_optnew, 135 "cs_local", &local, NULL); 136 if (!error) 137 error = vfs_getopt(mp->mnt_optnew, 138 "cs_dos", &dos, NULL); 139 if (!error) { 140 msdosfs_iconv->open(win, local, &pmp->pm_u2w); 141 msdosfs_iconv->open(local, win, &pmp->pm_w2u); 142 msdosfs_iconv->open(dos, local, &pmp->pm_u2d); 143 msdosfs_iconv->open(local, dos, &pmp->pm_d2u); 144 } 145 if (error != 0) 146 return (error); 147 } else { 148 pmp->pm_w2u = NULL; 149 pmp->pm_u2w = NULL; 150 pmp->pm_d2u = NULL; 151 pmp->pm_u2d = NULL; 152 } 153 } 154 155 if (1 == vfs_scanopt(mp->mnt_optnew, "gid", "%d", &v)) 156 pmp->pm_gid = v; 157 if (1 == vfs_scanopt(mp->mnt_optnew, "uid", "%d", &v)) 158 pmp->pm_uid = v; 159 if (1 == vfs_scanopt(mp->mnt_optnew, "mask", "%d", &v)) 160 pmp->pm_mask = v & ALLPERMS; 161 if (1 == vfs_scanopt(mp->mnt_optnew, "dirmask", "%d", &v)) 162 pmp->pm_dirmask = v & ALLPERMS; 163 vfs_flagopt(mp->mnt_optnew, "shortname", 164 &pmp->pm_flags, MSDOSFSMNT_SHORTNAME); 165 vfs_flagopt(mp->mnt_optnew, "shortnames", 166 &pmp->pm_flags, MSDOSFSMNT_SHORTNAME); 167 vfs_flagopt(mp->mnt_optnew, "longname", 168 &pmp->pm_flags, MSDOSFSMNT_LONGNAME); 169 vfs_flagopt(mp->mnt_optnew, "longnames", 170 &pmp->pm_flags, MSDOSFSMNT_LONGNAME); 171 vfs_flagopt(mp->mnt_optnew, "kiconv", 172 &pmp->pm_flags, MSDOSFSMNT_KICONV); 173 174 if (vfs_getopt(mp->mnt_optnew, "nowin95", NULL, NULL) == 0) 175 pmp->pm_flags |= MSDOSFSMNT_NOWIN95; 176 else 177 pmp->pm_flags &= ~MSDOSFSMNT_NOWIN95; 178 179 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 180 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 181 else if (!(pmp->pm_flags & 182 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 183 struct vnode *rootvp; 184 185 /* 186 * Try to divine whether to support Win'95 long filenames 187 */ 188 if (FAT32(pmp)) 189 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 190 else { 191 if ((error = 192 msdosfs_root(mp, LK_EXCLUSIVE, &rootvp, td)) != 0) 193 return error; 194 pmp->pm_flags |= findwin95(VTODE(rootvp)) 195 ? MSDOSFSMNT_LONGNAME 196 : MSDOSFSMNT_SHORTNAME; 197 vput(rootvp); 198 } 199 } 200 return 0; 201} 202 203static int 204msdosfs_cmount(struct mntarg *ma, void *data, int flags, struct thread *td) 205{ 206 struct msdosfs_args args; 207 int error; 208 209 if (data == NULL) 210 return (EINVAL); 211 error = copyin(data, &args, sizeof args); 212 if (error) 213 return (error); 214 215 ma = mount_argsu(ma, "from", args.fspec, MAXPATHLEN); 216 ma = mount_arg(ma, "export", &args.export, sizeof args.export); 217 ma = mount_argf(ma, "uid", "%d", args.uid); 218 ma = mount_argf(ma, "gid", "%d", args.gid); 219 ma = mount_argf(ma, "mask", "%d", args.mask); 220 ma = mount_argf(ma, "dirmask", "%d", args.dirmask); 221 222 ma = mount_argb(ma, args.flags & MSDOSFSMNT_SHORTNAME, "noshortname"); 223 ma = mount_argb(ma, args.flags & MSDOSFSMNT_LONGNAME, "nolongname"); 224 ma = mount_argb(ma, !(args.flags & MSDOSFSMNT_NOWIN95), "nowin95"); 225 ma = mount_argb(ma, args.flags & MSDOSFSMNT_KICONV, "nokiconv"); 226 227 ma = mount_argsu(ma, "cs_win", args.cs_win, MAXCSLEN); 228 ma = mount_argsu(ma, "cs_dos", args.cs_dos, MAXCSLEN); 229 ma = mount_argsu(ma, "cs_local", args.cs_local, MAXCSLEN); 230 231 error = kernel_mount(ma, flags); 232 233 return (error); 234} 235 236/* 237 * mp - path - addr in user space of mount point (ie /usr or whatever) 238 * data - addr in user space of mount params including the name of the block 239 * special file to treat as a filesystem. 240 */ 241static int 242msdosfs_mount(struct mount *mp, struct thread *td) 243{ 244 struct vnode *devvp; /* vnode for blk device to mount */ 245 /* msdosfs specific mount control block */ 246 struct msdosfsmount *pmp = NULL; 247 struct nameidata ndp; 248 int error, flags; 249 mode_t accessmode; 250 char *from; 251 252 if (vfs_filteropt(mp->mnt_optnew, msdosfs_opts)) 253 return (EINVAL); 254 255 /* 256 * If updating, check whether changing from read-only to 257 * read/write; if there is no device name, that's all we do. 258 */ 259 if (mp->mnt_flag & MNT_UPDATE) { 260 int ro_to_rw = 0; 261 pmp = VFSTOMSDOSFS(mp); 262 263 if (vfs_flagopt(mp->mnt_optnew, "export", NULL, 0)) { 264 /* 265 * Forbid export requests if filesystem has 266 * MSDOSFS_LARGEFS flag set. 267 */ 268 if ((pmp->pm_flags & MSDOSFS_LARGEFS) != 0) { 269 vfs_mount_error(mp, 270 "MSDOSFS_LARGEFS flag set, cannot export"); 271 return (EOPNOTSUPP); 272 } 273 } 274 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && 275 vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0)) { 276 error = VFS_SYNC(mp, MNT_WAIT, td); 277 if (error) 278 return (error); 279 flags = WRITECLOSE; 280 if (mp->mnt_flag & MNT_FORCE) 281 flags |= FORCECLOSE; 282 error = vflush(mp, 0, flags, td); 283 if (error) 284 return (error); 285 DROP_GIANT(); 286 g_topology_lock(); 287 g_access(pmp->pm_cp, 0, -1, 0); 288 g_topology_unlock(); 289 PICKUP_GIANT(); 290 /* Now the volume is clean. Mark it. */ 291 error = markvoldirty(pmp, 0); 292 if (error && (flags & FORCECLOSE) == 0) 293 return (error); 294 } else if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && 295 !vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0)) { 296 /* 297 * If upgrade to read-write by non-root, then verify 298 * that user has necessary permissions on the device. 299 */ 300 devvp = pmp->pm_devvp; 301 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 302 error = VOP_ACCESS(devvp, VREAD | VWRITE, 303 td->td_ucred, td); 304 if (error) 305 error = priv_check(td, PRIV_VFS_MOUNT_PERM); 306 if (error) { 307 VOP_UNLOCK(devvp, 0, td); 308 return (error); 309 } 310 VOP_UNLOCK(devvp, 0, td); 311 DROP_GIANT(); 312 g_topology_lock(); 313 error = g_access(pmp->pm_cp, 0, 1, 0); 314 g_topology_unlock(); 315 PICKUP_GIANT(); 316 if (error) 317 return (error); 318 319 ro_to_rw = 1; 320 } 321 vfs_flagopt(mp->mnt_optnew, "ro", 322 &pmp->pm_flags, MSDOSFSMNT_RONLY); 323 vfs_flagopt(mp->mnt_optnew, "ro", 324 &mp->mnt_flag, MNT_RDONLY); 325 326 if (ro_to_rw) { 327 /* Now that the volume is modifiable, mark it dirty. */ 328 error = markvoldirty(pmp, 1); 329 if (error) 330 return (error); 331 } 332 333 if (vfs_getopt(mp->mnt_optnew, "from", NULL, NULL)) { 334#ifdef __notyet__ /* doesn't work correctly with current mountd XXX */ 335 if (args.flags & MSDOSFSMNT_MNTOPT) { 336 pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT; 337 pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT; 338 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 339 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 340 } 341#endif 342 } 343 } 344 /* 345 * Not an update, or updating the name: look up the name 346 * and verify that it refers to a sensible disk device. 347 */ 348 if (vfs_getopt(mp->mnt_optnew, "from", (void **)&from, NULL)) 349 return (EINVAL); 350 NDINIT(&ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, from, td); 351 error = namei(&ndp); 352 if (error) 353 return (error); 354 devvp = ndp.ni_vp; 355 NDFREE(&ndp, NDF_ONLY_PNBUF); 356 357 if (!vn_isdisk(devvp, &error)) { 358 vput(devvp); 359 return (error); 360 } 361 /* 362 * If mount by non-root, then verify that user has necessary 363 * permissions on the device. 364 */ 365 accessmode = VREAD; 366 if ((mp->mnt_flag & MNT_RDONLY) == 0) 367 accessmode |= VWRITE; 368 error = VOP_ACCESS(devvp, accessmode, td->td_ucred, td); 369 if (error) 370 error = priv_check(td, PRIV_VFS_MOUNT_PERM); 371 if (error) { 372 vput(devvp); 373 return (error); 374 } 375 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 376 error = mountmsdosfs(devvp, mp, td); 377#ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 378 pmp = VFSTOMSDOSFS(mp); 379#endif 380 } else { 381 if (devvp != pmp->pm_devvp) 382 error = EINVAL; /* XXX needs translation */ 383 else 384 vput(devvp); 385 } 386 if (error) { 387 vrele(devvp); 388 return (error); 389 } 390 391 error = update_mp(mp, td); 392 if (error) { 393 if ((mp->mnt_flag & MNT_UPDATE) == 0) 394 msdosfs_unmount(mp, MNT_FORCE, td); 395 return error; 396 } 397 398 vfs_mountedfrom(mp, from); 399#ifdef MSDOSFS_DEBUG 400 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 401#endif 402 return (0); 403} 404 405static int 406mountmsdosfs(devvp, mp, td) 407 struct vnode *devvp; 408 struct mount *mp; 409 struct thread *td; 410{ 411 struct msdosfsmount *pmp; 412 struct buf *bp; 413 struct cdev *dev = devvp->v_rdev; 414 union bootsector *bsp; 415 struct byte_bpb33 *b33; 416 struct byte_bpb50 *b50; 417 struct byte_bpb710 *b710; 418 u_int8_t SecPerClust; 419 u_long clusters; 420 int ronly, error; 421 struct g_consumer *cp; 422 struct bufobj *bo; 423 424 ronly = !vfs_getopt(mp->mnt_optnew, "ro", NULL, NULL); 425 /* XXX: use VOP_ACCESS to check FS perms */ 426 DROP_GIANT(); 427 g_topology_lock(); 428 error = g_vfs_open(devvp, &cp, "msdos", ronly ? 0 : 1); 429 g_topology_unlock(); 430 PICKUP_GIANT(); 431 VOP_UNLOCK(devvp, 0, td); 432 if (error) 433 return (error); 434 435 bo = &devvp->v_bufobj; 436 bp = NULL; /* both used in error_exit */ 437 pmp = NULL; 438 439 /* 440 * Read the boot sector of the filesystem, and then check the 441 * boot signature. If not a dos boot sector then error out. 442 * 443 * NOTE: 2048 is a maximum sector size in current... 444 */ 445 error = bread(devvp, 0, 2048, NOCRED, &bp); 446 if (error) 447 goto error_exit; 448 bp->b_flags |= B_AGE; 449 bsp = (union bootsector *)bp->b_data; 450 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 451 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 452 b710 = (struct byte_bpb710 *)bsp->bs710.bsBPB; 453 454#ifndef MSDOSFS_NOCHECKSIG 455 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 456 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 457 error = EINVAL; 458 goto error_exit; 459 } 460#endif 461 462 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK | M_ZERO); 463 pmp->pm_mountp = mp; 464 pmp->pm_cp = cp; 465 pmp->pm_bo = bo; 466 467 /* 468 * Experimental support for large MS-DOS filesystems. 469 * WARNING: This uses at least 32 bytes of kernel memory (which is not 470 * reclaimed until the FS is unmounted) for each file on disk to map 471 * between the 32-bit inode numbers used by VFS and the 64-bit 472 * pseudo-inode numbers used internally by msdosfs. This is only 473 * safe to use in certain controlled situations (e.g. read-only FS 474 * with less than 1 million files). 475 * Since the mappings do not persist across unmounts (or reboots), these 476 * filesystems are not suitable for exporting through NFS, or any other 477 * application that requires fixed inode numbers. 478 */ 479 vfs_flagopt(mp->mnt_optnew, "large", &pmp->pm_flags, 480 MSDOSFS_LARGEFS); 481 482 /* 483 * Compute several useful quantities from the bpb in the 484 * bootsector. Copy in the dos 5 variant of the bpb then fix up 485 * the fields that are different between dos 5 and dos 3.3. 486 */ 487 SecPerClust = b50->bpbSecPerClust; 488 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 489 if (pmp->pm_BytesPerSec < DEV_BSIZE) { 490 error = EINVAL; 491 goto error_exit; 492 } 493 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 494 pmp->pm_FATs = b50->bpbFATs; 495 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 496 pmp->pm_Sectors = getushort(b50->bpbSectors); 497 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 498 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 499 pmp->pm_Heads = getushort(b50->bpbHeads); 500 pmp->pm_Media = b50->bpbMedia; 501 502 /* calculate the ratio of sector size to DEV_BSIZE */ 503 pmp->pm_BlkPerSec = pmp->pm_BytesPerSec / DEV_BSIZE; 504 505 /* XXX - We should probably check more values here */ 506 if (!pmp->pm_BytesPerSec || !SecPerClust 507 || !pmp->pm_Heads 508#ifdef PC98 509 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 255) { 510#else 511 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 63) { 512#endif 513 error = EINVAL; 514 goto error_exit; 515 } 516 517 if (pmp->pm_Sectors == 0) { 518 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 519 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 520 } else { 521 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 522 pmp->pm_HugeSectors = pmp->pm_Sectors; 523 } 524 if (!(pmp->pm_flags & MSDOSFS_LARGEFS)) { 525 if (pmp->pm_HugeSectors > 0xffffffff / 526 (pmp->pm_BytesPerSec / sizeof(struct direntry)) + 1) { 527 /* 528 * We cannot deal currently with this size of disk 529 * due to fileid limitations (see msdosfs_getattr and 530 * msdosfs_readdir) 531 */ 532 error = EINVAL; 533 vfs_mount_error(mp, 534 "Disk too big, try '-o large' mount option"); 535 goto error_exit; 536 } 537 } 538 539 if (pmp->pm_RootDirEnts == 0) { 540 if (pmp->pm_Sectors 541 || pmp->pm_FATsecs 542 || getushort(b710->bpbFSVers)) { 543 error = EINVAL; 544 printf("mountmsdosfs(): bad FAT32 filesystem\n"); 545 goto error_exit; 546 } 547 pmp->pm_fatmask = FAT32_MASK; 548 pmp->pm_fatmult = 4; 549 pmp->pm_fatdiv = 1; 550 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 551 if (getushort(b710->bpbExtFlags) & FATMIRROR) 552 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 553 else 554 pmp->pm_flags |= MSDOSFS_FATMIRROR; 555 } else 556 pmp->pm_flags |= MSDOSFS_FATMIRROR; 557 558 /* 559 * Check a few values (could do some more): 560 * - logical sector size: power of 2, >= block size 561 * - sectors per cluster: power of 2, >= 1 562 * - number of sectors: >= 1, <= size of partition 563 * - number of FAT sectors: >= 1 564 */ 565 if ( (SecPerClust == 0) 566 || (SecPerClust & (SecPerClust - 1)) 567 || (pmp->pm_BytesPerSec < DEV_BSIZE) 568 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 569 || (pmp->pm_HugeSectors == 0) 570 || (pmp->pm_FATsecs == 0) 571 ) { 572 error = EINVAL; 573 goto error_exit; 574 } 575 576 pmp->pm_HugeSectors *= pmp->pm_BlkPerSec; 577 pmp->pm_HiddenSects *= pmp->pm_BlkPerSec; /* XXX not used? */ 578 pmp->pm_FATsecs *= pmp->pm_BlkPerSec; 579 SecPerClust *= pmp->pm_BlkPerSec; 580 581 pmp->pm_fatblk = pmp->pm_ResSectors * pmp->pm_BlkPerSec; 582 583 if (FAT32(pmp)) { 584 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 585 pmp->pm_firstcluster = pmp->pm_fatblk 586 + (pmp->pm_FATs * pmp->pm_FATsecs); 587 pmp->pm_fsinfo = getushort(b710->bpbFSInfo) * pmp->pm_BlkPerSec; 588 } else { 589 pmp->pm_rootdirblk = pmp->pm_fatblk + 590 (pmp->pm_FATs * pmp->pm_FATsecs); 591 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 592 + DEV_BSIZE - 1) 593 / DEV_BSIZE; /* in blocks */ 594 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 595 } 596 597 pmp->pm_maxcluster = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 598 SecPerClust + 1; 599 pmp->pm_fatsize = pmp->pm_FATsecs * DEV_BSIZE; /* XXX not used? */ 600 601 if (pmp->pm_fatmask == 0) { 602 if (pmp->pm_maxcluster 603 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 604 /* 605 * This will usually be a floppy disk. This size makes 606 * sure that one fat entry will not be split across 607 * multiple blocks. 608 */ 609 pmp->pm_fatmask = FAT12_MASK; 610 pmp->pm_fatmult = 3; 611 pmp->pm_fatdiv = 2; 612 } else { 613 pmp->pm_fatmask = FAT16_MASK; 614 pmp->pm_fatmult = 2; 615 pmp->pm_fatdiv = 1; 616 } 617 } 618 619 clusters = (pmp->pm_fatsize / pmp->pm_fatmult) * pmp->pm_fatdiv; 620 if (pmp->pm_maxcluster >= clusters) { 621 printf("Warning: number of clusters (%ld) exceeds FAT " 622 "capacity (%ld)\n", pmp->pm_maxcluster + 1, clusters); 623 pmp->pm_maxcluster = clusters - 1; 624 } 625 626 627 if (FAT12(pmp)) 628 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 629 else 630 pmp->pm_fatblocksize = MSDOSFS_DFLTBSIZE; 631 632 pmp->pm_fatblocksec = pmp->pm_fatblocksize / DEV_BSIZE; 633 pmp->pm_bnshift = ffs(DEV_BSIZE) - 1; 634 635 /* 636 * Compute mask and shift value for isolating cluster relative byte 637 * offsets and cluster numbers from a file offset. 638 */ 639 pmp->pm_bpcluster = SecPerClust * DEV_BSIZE; 640 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 641 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 642 643 /* 644 * Check for valid cluster size 645 * must be a power of 2 646 */ 647 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 648 error = EINVAL; 649 goto error_exit; 650 } 651 652 /* 653 * Release the bootsector buffer. 654 */ 655 brelse(bp); 656 bp = NULL; 657 658 /* 659 * Check FSInfo. 660 */ 661 if (pmp->pm_fsinfo) { 662 struct fsinfo *fp; 663 664 if ((error = bread(devvp, pmp->pm_fsinfo, fsi_size(pmp), 665 NOCRED, &bp)) != 0) 666 goto error_exit; 667 fp = (struct fsinfo *)bp->b_data; 668 if (!bcmp(fp->fsisig1, "RRaA", 4) 669 && !bcmp(fp->fsisig2, "rrAa", 4) 670 && !bcmp(fp->fsisig3, "\0\0\125\252", 4) 671 && !bcmp(fp->fsisig4, "\0\0\125\252", 4)) { 672 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 673 if (pmp->pm_nxtfree == 0xffffffff) 674 pmp->pm_nxtfree = CLUST_FIRST; 675 } else 676 pmp->pm_fsinfo = 0; 677 brelse(bp); 678 bp = NULL; 679 } 680 681 /* 682 * Check and validate (or perhaps invalidate?) the fsinfo structure? 683 */ 684 if (pmp->pm_fsinfo && pmp->pm_nxtfree > pmp->pm_maxcluster) { 685 printf( 686 "Next free cluster in FSInfo (%lu) exceeds maxcluster (%lu)\n", 687 pmp->pm_nxtfree, pmp->pm_maxcluster); 688 error = EINVAL; 689 goto error_exit; 690 } 691 692 /* 693 * Allocate memory for the bitmap of allocated clusters, and then 694 * fill it in. 695 */ 696 pmp->pm_inusemap = malloc(howmany(pmp->pm_maxcluster + 1, N_INUSEBITS) 697 * sizeof(*pmp->pm_inusemap), 698 M_MSDOSFSFAT, M_WAITOK); 699 700 /* 701 * fillinusemap() needs pm_devvp. 702 */ 703 pmp->pm_devvp = devvp; 704 705 /* 706 * Have the inuse map filled in. 707 */ 708 if ((error = fillinusemap(pmp)) != 0) 709 goto error_exit; 710 711 /* 712 * If they want fat updates to be synchronous then let them suffer 713 * the performance degradation in exchange for the on disk copy of 714 * the fat being correct just about all the time. I suppose this 715 * would be a good thing to turn on if the kernel is still flakey. 716 */ 717 if (mp->mnt_flag & MNT_SYNCHRONOUS) 718 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 719 720 /* 721 * Finish up. 722 */ 723 if (ronly) 724 pmp->pm_flags |= MSDOSFSMNT_RONLY; 725 else { 726 /* Mark the volume dirty while it is mounted read/write. */ 727 if ((error = markvoldirty(pmp, 1)) != 0) 728 goto error_exit; 729 pmp->pm_fmod = 1; 730 } 731 mp->mnt_data = (qaddr_t) pmp; 732 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 733 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 734 MNT_ILOCK(mp); 735 mp->mnt_flag |= MNT_LOCAL; 736 MNT_IUNLOCK(mp); 737 738 if (pmp->pm_flags & MSDOSFS_LARGEFS) 739 msdosfs_fileno_init(mp); 740 741 return 0; 742 743error_exit: 744 if (bp) 745 brelse(bp); 746 if (cp != NULL) { 747 DROP_GIANT(); 748 g_topology_lock(); 749 g_vfs_close(cp, td); 750 g_topology_unlock(); 751 PICKUP_GIANT(); 752 } 753 if (pmp) { 754 if (pmp->pm_inusemap) 755 free(pmp->pm_inusemap, M_MSDOSFSFAT); 756 free(pmp, M_MSDOSFSMNT); 757 mp->mnt_data = (qaddr_t)0; 758 } 759 return (error); 760} 761 762/* 763 * Unmount the filesystem described by mp. 764 */ 765static int 766msdosfs_unmount(mp, mntflags, td) 767 struct mount *mp; 768 int mntflags; 769 struct thread *td; 770{ 771 struct msdosfsmount *pmp; 772 int error, flags; 773 774 flags = 0; 775 if (mntflags & MNT_FORCE) 776 flags |= FORCECLOSE; 777 error = vflush(mp, 0, flags, td); 778 if (error) 779 return error; 780 pmp = VFSTOMSDOSFS(mp); 781 if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) { 782 if (pmp->pm_w2u) 783 msdosfs_iconv->close(pmp->pm_w2u); 784 if (pmp->pm_u2w) 785 msdosfs_iconv->close(pmp->pm_u2w); 786 if (pmp->pm_d2u) 787 msdosfs_iconv->close(pmp->pm_d2u); 788 if (pmp->pm_u2d) 789 msdosfs_iconv->close(pmp->pm_u2d); 790 } 791 792 /* If the volume was mounted read/write, mark it clean now. */ 793 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) == 0) { 794 error = markvoldirty(pmp, 0); 795 if (error && (flags & FORCECLOSE) == 0) 796 return (error); 797 } 798#ifdef MSDOSFS_DEBUG 799 { 800 struct vnode *vp = pmp->pm_devvp; 801 802 VI_LOCK(vp); 803 vn_printf(vp, 804 "msdosfs_umount(): just before calling VOP_CLOSE()\n"); 805 printf("freef %p, freeb %p, mount %p\n", 806 TAILQ_NEXT(vp, v_freelist), vp->v_freelist.tqe_prev, 807 vp->v_mount); 808 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %ld, type %d\n", 809 TAILQ_FIRST(&vp->v_bufobj.bo_clean.bv_hd), 810 TAILQ_FIRST(&vp->v_bufobj.bo_dirty.bv_hd), 811 vp->v_bufobj.bo_numoutput, vp->v_type); 812 VI_UNLOCK(vp); 813 } 814#endif 815 DROP_GIANT(); 816 g_topology_lock(); 817 g_vfs_close(pmp->pm_cp, td); 818 g_topology_unlock(); 819 PICKUP_GIANT(); 820 vrele(pmp->pm_devvp); 821 free(pmp->pm_inusemap, M_MSDOSFSFAT); 822 if (pmp->pm_flags & MSDOSFS_LARGEFS) { 823 msdosfs_fileno_free(mp); 824 } 825 free(pmp, M_MSDOSFSMNT); 826 mp->mnt_data = (qaddr_t)0; 827 MNT_ILOCK(mp); 828 mp->mnt_flag &= ~MNT_LOCAL; 829 MNT_IUNLOCK(mp); 830 return (error); 831} 832 833static int 834msdosfs_root(mp, flags, vpp, td) 835 struct mount *mp; 836 int flags; 837 struct vnode **vpp; 838 struct thread *td; 839{ 840 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 841 struct denode *ndep; 842 int error; 843 844#ifdef MSDOSFS_DEBUG 845 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 846#endif 847 error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep); 848 if (error) 849 return (error); 850 *vpp = DETOV(ndep); 851 return (0); 852} 853 854static int 855msdosfs_statfs(mp, sbp, td) 856 struct mount *mp; 857 struct statfs *sbp; 858 struct thread *td; 859{ 860 struct msdosfsmount *pmp; 861 862 pmp = VFSTOMSDOSFS(mp); 863 sbp->f_bsize = pmp->pm_bpcluster; 864 sbp->f_iosize = pmp->pm_bpcluster; 865 sbp->f_blocks = pmp->pm_maxcluster + 1; 866 sbp->f_bfree = pmp->pm_freeclustercount; 867 sbp->f_bavail = pmp->pm_freeclustercount; 868 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 869 sbp->f_ffree = 0; /* what to put in here? */ 870 return (0); 871} 872 873static int 874msdosfs_sync(mp, waitfor, td) 875 struct mount *mp; 876 int waitfor; 877 struct thread *td; 878{ 879 struct vnode *vp, *nvp; 880 struct denode *dep; 881 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 882 int error, allerror = 0; 883 884 /* 885 * If we ever switch to not updating all of the fats all the time, 886 * this would be the place to update them from the first one. 887 */ 888 if (pmp->pm_fmod != 0) { 889 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 890 panic("msdosfs_sync: rofs mod"); 891 else { 892 /* update fats here */ 893 } 894 } 895 /* 896 * Write back each (modified) denode. 897 */ 898 MNT_ILOCK(mp); 899loop: 900 MNT_VNODE_FOREACH(vp, mp, nvp) { 901 VI_LOCK(vp); 902 if (vp->v_type == VNON || (vp->v_iflag & VI_DOOMED)) { 903 VI_UNLOCK(vp); 904 continue; 905 } 906 MNT_IUNLOCK(mp); 907 dep = VTODE(vp); 908 if ((dep->de_flag & 909 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 && 910 (vp->v_bufobj.bo_dirty.bv_cnt == 0 || 911 waitfor == MNT_LAZY)) { 912 VI_UNLOCK(vp); 913 MNT_ILOCK(mp); 914 continue; 915 } 916 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td); 917 if (error) { 918 MNT_ILOCK(mp); 919 if (error == ENOENT) 920 goto loop; 921 continue; 922 } 923 error = VOP_FSYNC(vp, waitfor, td); 924 if (error) 925 allerror = error; 926 VOP_UNLOCK(vp, 0, td); 927 vrele(vp); 928 MNT_ILOCK(mp); 929 } 930 MNT_IUNLOCK(mp); 931 932 /* 933 * Flush filesystem control info. 934 */ 935 if (waitfor != MNT_LAZY) { 936 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY, td); 937 error = VOP_FSYNC(pmp->pm_devvp, waitfor, td); 938 if (error) 939 allerror = error; 940 VOP_UNLOCK(pmp->pm_devvp, 0, td); 941 } 942 return (allerror); 943} 944 945static int 946msdosfs_fhtovp(mp, fhp, vpp) 947 struct mount *mp; 948 struct fid *fhp; 949 struct vnode **vpp; 950{ 951 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 952 struct defid *defhp = (struct defid *) fhp; 953 struct denode *dep; 954 int error; 955 956 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 957 if (error) { 958 *vpp = NULLVP; 959 return (error); 960 } 961 *vpp = DETOV(dep); 962 vnode_create_vobject(*vpp, dep->de_FileSize, curthread); 963 return (0); 964} 965 966static int 967msdosfs_vptofh(vp, fhp) 968 struct vnode *vp; 969 struct fid *fhp; 970{ 971 struct denode *dep; 972 struct defid *defhp; 973 974 dep = VTODE(vp); 975 defhp = (struct defid *)fhp; 976 defhp->defid_len = sizeof(struct defid); 977 defhp->defid_dirclust = dep->de_dirclust; 978 defhp->defid_dirofs = dep->de_diroffset; 979 /* defhp->defid_gen = dep->de_gen; */ 980 return (0); 981} 982 983static struct vfsops msdosfs_vfsops = { 984 .vfs_fhtovp = msdosfs_fhtovp, 985 .vfs_mount = msdosfs_mount, 986 .vfs_cmount = msdosfs_cmount, 987 .vfs_root = msdosfs_root, 988 .vfs_statfs = msdosfs_statfs, 989 .vfs_sync = msdosfs_sync, 990 .vfs_unmount = msdosfs_unmount, 991 .vfs_vptofh = msdosfs_vptofh, 992}; 993 994VFS_SET(msdosfs_vfsops, msdosfs, 0); 995MODULE_VERSION(msdosfs, 1); 996