1 /* $NetBSD: msdosfs_vfsops.c,v 1.118 2015/03/28 19:24:05 maxv Exp $ */ 2 3 /*- 4 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. 5 * Copyright (C) 1994, 1995, 1997 TooLs GmbH. 6 * All rights reserved. 7 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by TooLs GmbH. 20 * 4. The name of TooLs GmbH may not be used to endorse or promote products 21 * derived from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 26 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 27 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 28 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 29 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 30 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 31 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 32 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 /* 35 * Written by Paul Popelka (paulp@uts.amdahl.com) 36 * 37 * You can do anything you want with this software, just don't say you wrote 38 * it, and don't remove this notice. 39 * 40 * This software is provided "as is". 41 * 42 * The author supplies this software to be publicly redistributed on the 43 * understanding that the author is not responsible for the correct 44 * functioning of this software in any circumstances and is not liable for 45 * any damages caused by this software. 46 * 47 * October 1992 48 */ 49 50 #include <sys/cdefs.h> 51 __KERNEL_RCSID(0, "$NetBSD: msdosfs_vfsops.c,v 1.118 2015/03/28 19:24:05 maxv Exp $"); 52 53 #if defined(_KERNEL_OPT) 54 #include "opt_compat_netbsd.h" 55 #endif 56 57 #include <sys/param.h> 58 #include <sys/systm.h> 59 #include <sys/sysctl.h> 60 #include <sys/namei.h> 61 #include <sys/proc.h> 62 #include <sys/kernel.h> 63 #include <sys/vnode.h> 64 #include <miscfs/genfs/genfs.h> 65 #include <miscfs/specfs/specdev.h> /* XXX */ /* defines v_rdev */ 66 #include <sys/mount.h> 67 #include <sys/buf.h> 68 #include <sys/file.h> 69 #include <sys/device.h> 70 #include <sys/disklabel.h> 71 #include <sys/disk.h> 72 #include <sys/fstrans.h> 73 #include <sys/ioctl.h> 74 #include <sys/malloc.h> 75 #include <sys/dirent.h> 76 #include <sys/stat.h> 77 #include <sys/conf.h> 78 #include <sys/kauth.h> 79 #include <sys/module.h> 80 81 #include <fs/msdosfs/bpb.h> 82 #include <fs/msdosfs/bootsect.h> 83 #include <fs/msdosfs/direntry.h> 84 #include <fs/msdosfs/denode.h> 85 #include <fs/msdosfs/msdosfsmount.h> 86 #include <fs/msdosfs/fat.h> 87 88 MODULE(MODULE_CLASS_VFS, msdos, NULL); 89 90 #ifdef MSDOSFS_DEBUG 91 #define DPRINTF(fmt, ...) uprintf("%s(): " fmt "\n", __func__, ##__VA_ARGS__) 92 #else 93 #define DPRINTF(fmt, ...) 94 #endif 95 96 #define GEMDOSFS_BSIZE 512 97 98 #define MSDOSFS_NAMEMAX(pmp) \ 99 (pmp)->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12 100 101 int msdosfs_mountfs(struct vnode *, struct mount *, struct lwp *, 102 struct msdosfs_args *); 103 104 static int update_mp(struct mount *, struct msdosfs_args *); 105 106 MALLOC_JUSTDEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOS FS mount structure"); 107 MALLOC_JUSTDEFINE(M_MSDOSFSFAT, "MSDOSFS FAT", "MSDOS FS FAT table"); 108 MALLOC_JUSTDEFINE(M_MSDOSFSTMP, "MSDOSFS temp", "MSDOS FS temp. structures"); 109 110 static struct sysctllog *msdosfs_sysctl_log; 111 112 extern const struct vnodeopv_desc msdosfs_vnodeop_opv_desc; 113 114 const struct vnodeopv_desc * const msdosfs_vnodeopv_descs[] = { 115 &msdosfs_vnodeop_opv_desc, 116 NULL, 117 }; 118 119 struct vfsops msdosfs_vfsops = { 120 .vfs_name = MOUNT_MSDOS, 121 .vfs_min_mount_data = sizeof (struct msdosfs_args), 122 .vfs_mount = msdosfs_mount, 123 .vfs_start = msdosfs_start, 124 .vfs_unmount = msdosfs_unmount, 125 .vfs_root = msdosfs_root, 126 .vfs_quotactl = (void *)eopnotsupp, 127 .vfs_statvfs = msdosfs_statvfs, 128 .vfs_sync = msdosfs_sync, 129 .vfs_vget = msdosfs_vget, 130 .vfs_loadvnode = msdosfs_loadvnode, 131 .vfs_fhtovp = msdosfs_fhtovp, 132 .vfs_vptofh = msdosfs_vptofh, 133 .vfs_init = msdosfs_init, 134 .vfs_reinit = msdosfs_reinit, 135 .vfs_done = msdosfs_done, 136 .vfs_mountroot = msdosfs_mountroot, 137 .vfs_snapshot = (void *)eopnotsupp, 138 .vfs_extattrctl = vfs_stdextattrctl, 139 .vfs_suspendctl = msdosfs_suspendctl, 140 .vfs_renamelock_enter = genfs_renamelock_enter, 141 .vfs_renamelock_exit = genfs_renamelock_exit, 142 .vfs_fsync = (void *)eopnotsupp, 143 .vfs_opv_descs = msdosfs_vnodeopv_descs 144 }; 145 146 static int 147 msdos_modcmd(modcmd_t cmd, void *arg) 148 { 149 int error; 150 151 switch (cmd) { 152 case MODULE_CMD_INIT: 153 error = vfs_attach(&msdosfs_vfsops); 154 if (error != 0) 155 break; 156 sysctl_createv(&msdosfs_sysctl_log, 0, NULL, NULL, 157 CTLFLAG_PERMANENT, 158 CTLTYPE_NODE, "msdosfs", 159 SYSCTL_DESCR("MS-DOS file system"), 160 NULL, 0, NULL, 0, 161 CTL_VFS, 4, CTL_EOL); 162 /* 163 * XXX the "4" above could be dynamic, thereby eliminating one 164 * more instance of the "number to vfs" mapping problem, but 165 * "4" is the order as taken from sys/mount.h 166 */ 167 break; 168 case MODULE_CMD_FINI: 169 error = vfs_detach(&msdosfs_vfsops); 170 if (error != 0) 171 break; 172 sysctl_teardown(&msdosfs_sysctl_log); 173 break; 174 default: 175 error = ENOTTY; 176 break; 177 } 178 179 return (error); 180 } 181 182 static int 183 update_mp(struct mount *mp, struct msdosfs_args *argp) 184 { 185 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 186 int error; 187 188 pmp->pm_gid = argp->gid; 189 pmp->pm_uid = argp->uid; 190 pmp->pm_mask = argp->mask & ALLPERMS; 191 pmp->pm_dirmask = argp->dirmask & ALLPERMS; 192 pmp->pm_gmtoff = argp->gmtoff; 193 pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT; 194 195 /* 196 * GEMDOS knows nothing about win95 long filenames 197 */ 198 if (pmp->pm_flags & MSDOSFSMNT_GEMDOSFS) 199 pmp->pm_flags |= MSDOSFSMNT_NOWIN95; 200 201 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 202 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 203 else if (!(pmp->pm_flags & 204 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 205 struct vnode *rtvp; 206 207 /* 208 * Try to divine whether to support Win'95 long filenames 209 */ 210 if (FAT32(pmp)) 211 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 212 else { 213 if ((error = msdosfs_root(mp, &rtvp)) != 0) 214 return error; 215 pmp->pm_flags |= findwin95(VTODE(rtvp)) 216 ? MSDOSFSMNT_LONGNAME 217 : MSDOSFSMNT_SHORTNAME; 218 vput(rtvp); 219 } 220 } 221 222 mp->mnt_stat.f_namemax = MSDOSFS_NAMEMAX(pmp); 223 224 return 0; 225 } 226 227 int 228 msdosfs_mountroot(void) 229 { 230 struct mount *mp; 231 struct lwp *l = curlwp; /* XXX */ 232 int error; 233 struct msdosfs_args args; 234 235 if (device_class(root_device) != DV_DISK) 236 return (ENODEV); 237 238 if ((error = vfs_rootmountalloc(MOUNT_MSDOS, "root_device", &mp))) { 239 vrele(rootvp); 240 return (error); 241 } 242 243 args.flags = MSDOSFSMNT_VERSIONED; 244 args.uid = 0; 245 args.gid = 0; 246 args.mask = 0777; 247 args.version = MSDOSFSMNT_VERSION; 248 args.dirmask = 0777; 249 250 if ((error = msdosfs_mountfs(rootvp, mp, l, &args)) != 0) { 251 vfs_unbusy(mp, false, NULL); 252 vfs_destroy(mp); 253 return (error); 254 } 255 256 if ((error = update_mp(mp, &args)) != 0) { 257 (void)msdosfs_unmount(mp, 0); 258 vfs_unbusy(mp, false, NULL); 259 vfs_destroy(mp); 260 vrele(rootvp); 261 return (error); 262 } 263 264 mountlist_append(mp); 265 (void)msdosfs_statvfs(mp, &mp->mnt_stat); 266 vfs_unbusy(mp, false, NULL); 267 return (0); 268 } 269 270 /* 271 * mp - path - addr in user space of mount point (ie /usr or whatever) 272 * data - addr in user space of mount params including the name of the block 273 * special file to treat as a filesystem. 274 */ 275 int 276 msdosfs_mount(struct mount *mp, const char *path, void *data, size_t *data_len) 277 { 278 struct lwp *l = curlwp; 279 struct vnode *devvp; /* vnode for blk device to mount */ 280 struct msdosfs_args *args = data; /* holds data from mount request */ 281 /* msdosfs specific mount control block */ 282 struct msdosfsmount *pmp = NULL; 283 int error, flags; 284 mode_t accessmode; 285 286 if (args == NULL) 287 return EINVAL; 288 if (*data_len < sizeof *args) 289 return EINVAL; 290 291 if (mp->mnt_flag & MNT_GETARGS) { 292 pmp = VFSTOMSDOSFS(mp); 293 if (pmp == NULL) 294 return EIO; 295 args->fspec = NULL; 296 args->uid = pmp->pm_uid; 297 args->gid = pmp->pm_gid; 298 args->mask = pmp->pm_mask; 299 args->flags = pmp->pm_flags; 300 args->version = MSDOSFSMNT_VERSION; 301 args->dirmask = pmp->pm_dirmask; 302 args->gmtoff = pmp->pm_gmtoff; 303 *data_len = sizeof *args; 304 return 0; 305 } 306 307 /* 308 * If not versioned (i.e. using old mount_msdos(8)), fill in 309 * the additional structure items with suitable defaults. 310 */ 311 if ((args->flags & MSDOSFSMNT_VERSIONED) == 0) { 312 args->version = 1; 313 args->dirmask = args->mask; 314 } 315 316 /* 317 * Reset GMT offset for pre-v3 mount structure args. 318 */ 319 if (args->version < 3) 320 args->gmtoff = 0; 321 322 /* 323 * If updating, check whether changing from read-only to 324 * read/write; if there is no device name, that's all we do. 325 */ 326 if (mp->mnt_flag & MNT_UPDATE) { 327 pmp = VFSTOMSDOSFS(mp); 328 error = 0; 329 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && 330 (mp->mnt_flag & MNT_RDONLY)) { 331 flags = WRITECLOSE; 332 if (mp->mnt_flag & MNT_FORCE) 333 flags |= FORCECLOSE; 334 error = vflush(mp, NULLVP, flags); 335 } 336 if (!error && (mp->mnt_flag & MNT_RELOAD)) 337 /* not yet implemented */ 338 error = EOPNOTSUPP; 339 if (error) { 340 DPRINTF("vflush %d", error); 341 return (error); 342 } 343 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && 344 (mp->mnt_iflag & IMNT_WANTRDWR)) { 345 /* 346 * If upgrade to read-write by non-root, then verify 347 * that user has necessary permissions on the device. 348 * 349 * Permission to update a mount is checked higher, so 350 * here we presume updating the mount is okay (for 351 * example, as far as securelevel goes) which leaves us 352 * with the normal check. 353 */ 354 devvp = pmp->pm_devvp; 355 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 356 error = kauth_authorize_system(l->l_cred, 357 KAUTH_SYSTEM_MOUNT, KAUTH_REQ_SYSTEM_MOUNT_DEVICE, 358 mp, devvp, KAUTH_ARG(VREAD | VWRITE)); 359 VOP_UNLOCK(devvp); 360 DPRINTF("KAUTH_REQ_SYSTEM_MOUNT_DEVICE %d", error); 361 if (error) 362 return (error); 363 364 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 365 } 366 if (args->fspec == NULL) { 367 DPRINTF("missing fspec"); 368 return EINVAL; 369 } 370 } 371 /* 372 * Not an update, or updating the name: look up the name 373 * and verify that it refers to a sensible block device. 374 */ 375 error = namei_simple_user(args->fspec, 376 NSM_FOLLOW_NOEMULROOT, &devvp); 377 if (error != 0) { 378 DPRINTF("namei %d", error); 379 return (error); 380 } 381 382 if (devvp->v_type != VBLK) { 383 DPRINTF("not block"); 384 vrele(devvp); 385 return (ENOTBLK); 386 } 387 if (bdevsw_lookup(devvp->v_rdev) == NULL) { 388 DPRINTF("no block switch"); 389 vrele(devvp); 390 return (ENXIO); 391 } 392 /* 393 * If mount by non-root, then verify that user has necessary 394 * permissions on the device. 395 */ 396 accessmode = VREAD; 397 if ((mp->mnt_flag & MNT_RDONLY) == 0) 398 accessmode |= VWRITE; 399 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 400 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT, 401 KAUTH_REQ_SYSTEM_MOUNT_DEVICE, mp, devvp, KAUTH_ARG(accessmode)); 402 VOP_UNLOCK(devvp); 403 if (error) { 404 DPRINTF("KAUTH_REQ_SYSTEM_MOUNT_DEVICE %d", error); 405 vrele(devvp); 406 return (error); 407 } 408 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 409 int xflags; 410 411 if (mp->mnt_flag & MNT_RDONLY) 412 xflags = FREAD; 413 else 414 xflags = FREAD|FWRITE; 415 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 416 error = VOP_OPEN(devvp, xflags, FSCRED); 417 VOP_UNLOCK(devvp); 418 if (error) { 419 DPRINTF("VOP_OPEN %d", error); 420 goto fail; 421 } 422 error = msdosfs_mountfs(devvp, mp, l, args); 423 if (error) { 424 DPRINTF("msdosfs_mountfs %d", error); 425 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 426 (void) VOP_CLOSE(devvp, xflags, NOCRED); 427 VOP_UNLOCK(devvp); 428 goto fail; 429 } 430 #ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 431 pmp = VFSTOMSDOSFS(mp); 432 #endif 433 } else { 434 vrele(devvp); 435 if (devvp != pmp->pm_devvp) { 436 DPRINTF("devvp %p pmp %p", devvp, pmp->pm_devvp); 437 return (EINVAL); /* needs translation */ 438 } 439 } 440 if ((error = update_mp(mp, args)) != 0) { 441 msdosfs_unmount(mp, MNT_FORCE); 442 DPRINTF("update_mp %d", error); 443 return error; 444 } 445 446 #ifdef MSDOSFS_DEBUG 447 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 448 #endif 449 return set_statvfs_info(path, UIO_USERSPACE, args->fspec, UIO_USERSPACE, 450 mp->mnt_op->vfs_name, mp, l); 451 452 fail: 453 vrele(devvp); 454 return (error); 455 } 456 457 int 458 msdosfs_mountfs(struct vnode *devvp, struct mount *mp, struct lwp *l, struct msdosfs_args *argp) 459 { 460 struct msdosfsmount *pmp; 461 struct buf *bp; 462 dev_t dev = devvp->v_rdev; 463 union bootsector *bsp; 464 struct byte_bpb33 *b33; 465 struct byte_bpb50 *b50; 466 struct byte_bpb710 *b710; 467 uint8_t SecPerClust; 468 int ronly, error, BlkPerSec; 469 uint64_t psize; 470 unsigned secsize; 471 472 /* Flush out any old buffers remaining from a previous use. */ 473 if ((error = vinvalbuf(devvp, V_SAVE, l->l_cred, l, 0, 0)) != 0) 474 return (error); 475 476 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 477 478 bp = NULL; /* both used in error_exit */ 479 pmp = NULL; 480 481 error = fstrans_mount(mp); 482 if (error) 483 goto error_exit; 484 485 error = getdisksize(devvp, &psize, &secsize); 486 if (error) { 487 if (argp->flags & MSDOSFSMNT_GEMDOSFS) 488 goto error_exit; 489 490 /* ok, so it failed. we most likely don't need the info */ 491 secsize = DEV_BSIZE; 492 psize = 0; 493 error = 0; 494 } 495 if (secsize < DEV_BSIZE) { 496 DPRINTF("Invalid block secsize (%d < DEV_BSIZE)", secsize); 497 error = EINVAL; 498 goto error_exit; 499 } 500 501 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 502 if (secsize != GEMDOSFS_BSIZE) { 503 DPRINTF("Invalid block secsize %d for GEMDOS", secsize); 504 error = EINVAL; 505 goto error_exit; 506 } 507 } 508 509 /* 510 * Read the boot sector of the filesystem, and then check the 511 * boot signature. If not a dos boot sector then error out. 512 */ 513 if (secsize < sizeof(*b50)) { 514 DPRINTF("50 bootsec %u\n", secsize); 515 error = EINVAL; 516 goto error_exit; 517 } 518 if ((error = bread(devvp, 0, secsize, 0, &bp)) != 0) 519 goto error_exit; 520 bsp = (union bootsector *)bp->b_data; 521 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 522 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 523 b710 = (struct byte_bpb710 *)bsp->bs710.bsBPB; 524 525 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 526 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 527 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 528 DPRINTF("bootsig0 %d bootsig1 %d", 529 bsp->bs50.bsBootSectSig0, 530 bsp->bs50.bsBootSectSig1); 531 error = EINVAL; 532 goto error_exit; 533 } 534 } 535 536 pmp = malloc(sizeof(*pmp), M_MSDOSFSMNT, M_WAITOK|M_ZERO); 537 pmp->pm_mountp = mp; 538 539 /* 540 * Compute several useful quantities from the bpb in the 541 * bootsector. Copy in the dos 5 variant of the bpb then fix up 542 * the fields that are different between dos 5 and dos 3.3. 543 */ 544 SecPerClust = b50->bpbSecPerClust; 545 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 546 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 547 pmp->pm_FATs = b50->bpbFATs; 548 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 549 pmp->pm_Sectors = getushort(b50->bpbSectors); 550 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 551 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 552 pmp->pm_Heads = getushort(b50->bpbHeads); 553 pmp->pm_Media = b50->bpbMedia; 554 555 if (pmp->pm_Sectors == 0) { 556 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 557 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 558 } else { 559 if (secsize < sizeof(*b33)) { 560 DPRINTF("33 bootsec %u\n", secsize); 561 error = EINVAL; 562 goto error_exit; 563 } 564 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 565 pmp->pm_HugeSectors = pmp->pm_Sectors; 566 } 567 568 /* 569 * Sanity checks, from the FAT specification: 570 * - sectors per cluster: >= 1, power of 2 571 * - logical sector size: >= 1, power of 2 572 * - cluster size: <= max FS block size 573 * - number of sectors: >= 1 574 */ 575 if ((SecPerClust == 0) || !powerof2(SecPerClust) || 576 (pmp->pm_BytesPerSec == 0) || !powerof2(pmp->pm_BytesPerSec) || 577 (SecPerClust * pmp->pm_BytesPerSec > MAXBSIZE) || 578 (pmp->pm_HugeSectors == 0)) { 579 DPRINTF("consistency checks"); 580 error = EINVAL; 581 goto error_exit; 582 } 583 584 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS) && 585 (pmp->pm_SecPerTrack > 63)) { 586 DPRINTF("SecPerTrack %d", pmp->pm_SecPerTrack); 587 error = EINVAL; 588 goto error_exit; 589 } 590 591 if (pmp->pm_RootDirEnts == 0) { 592 if (secsize < sizeof(*b710)) { 593 DPRINTF("710 bootsec %u\n", secsize); 594 error = EINVAL; 595 goto error_exit; 596 } 597 unsigned short FSVers = getushort(b710->bpbFSVers); 598 unsigned short ExtFlags = getushort(b710->bpbExtFlags); 599 /* 600 * Some say that bsBootSectSig[23] must be zero, but 601 * Windows does not require this and some digital cameras 602 * do not set these to zero. Therefore, do not insist. 603 */ 604 if (pmp->pm_Sectors || pmp->pm_FATsecs || FSVers) { 605 DPRINTF("Sectors %d FATsecs %lu FSVers %d", 606 pmp->pm_Sectors, pmp->pm_FATsecs, FSVers); 607 error = EINVAL; 608 goto error_exit; 609 } 610 pmp->pm_fatmask = FAT32_MASK; 611 pmp->pm_fatmult = 4; 612 pmp->pm_fatdiv = 1; 613 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 614 615 /* Mirroring is enabled if the FATMIRROR bit is not set. */ 616 if ((ExtFlags & FATMIRROR) == 0) 617 pmp->pm_flags |= MSDOSFS_FATMIRROR; 618 else 619 pmp->pm_curfat = ExtFlags & FATNUM; 620 } else 621 pmp->pm_flags |= MSDOSFS_FATMIRROR; 622 623 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 624 if (FAT32(pmp)) { 625 /* GEMDOS doesn't know FAT32. */ 626 DPRINTF("FAT32 for GEMDOS"); 627 error = EINVAL; 628 goto error_exit; 629 } 630 631 /* 632 * Check a few values (could do some more): 633 * - logical sector size: >= block size 634 * - number of sectors: <= size of partition 635 */ 636 if ((pmp->pm_BytesPerSec < GEMDOSFS_BSIZE) || 637 (pmp->pm_HugeSectors * 638 (pmp->pm_BytesPerSec / GEMDOSFS_BSIZE) > psize)) { 639 DPRINTF("consistency checks for GEMDOS"); 640 error = EINVAL; 641 goto error_exit; 642 } 643 /* 644 * XXX - Many parts of the msdosfs driver seem to assume that 645 * the number of bytes per logical sector (BytesPerSec) will 646 * always be the same as the number of bytes per disk block 647 * Let's pretend it is. 648 */ 649 BlkPerSec = pmp->pm_BytesPerSec / GEMDOSFS_BSIZE; 650 pmp->pm_BytesPerSec = GEMDOSFS_BSIZE; 651 pmp->pm_HugeSectors *= BlkPerSec; 652 pmp->pm_HiddenSects *= BlkPerSec; 653 pmp->pm_ResSectors *= BlkPerSec; 654 pmp->pm_Sectors *= BlkPerSec; 655 pmp->pm_FATsecs *= BlkPerSec; 656 SecPerClust *= BlkPerSec; 657 } 658 659 /* Check that fs has nonzero FAT size */ 660 if (pmp->pm_FATsecs == 0) { 661 DPRINTF("FATsecs is 0"); 662 error = EINVAL; 663 goto error_exit; 664 } 665 666 pmp->pm_fatblk = pmp->pm_ResSectors; 667 if (FAT32(pmp)) { 668 if (secsize < sizeof(*b710)) { 669 DPRINTF("710 bootsec %u\n", secsize); 670 error = EINVAL; 671 goto error_exit; 672 } 673 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 674 pmp->pm_firstcluster = pmp->pm_fatblk 675 + (pmp->pm_FATs * pmp->pm_FATsecs); 676 pmp->pm_fsinfo = getushort(b710->bpbFSInfo); 677 } else { 678 pmp->pm_rootdirblk = pmp->pm_fatblk + 679 (pmp->pm_FATs * pmp->pm_FATsecs); 680 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 681 + pmp->pm_BytesPerSec - 1) 682 / pmp->pm_BytesPerSec;/* in sectors */ 683 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 684 } 685 686 pmp->pm_nmbrofclusters = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 687 SecPerClust; 688 pmp->pm_maxcluster = pmp->pm_nmbrofclusters + 1; 689 pmp->pm_fatsize = pmp->pm_FATsecs * pmp->pm_BytesPerSec; 690 691 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 692 if (pmp->pm_nmbrofclusters <= (0xff0 - 2)) { 693 pmp->pm_fatmask = FAT12_MASK; 694 pmp->pm_fatmult = 3; 695 pmp->pm_fatdiv = 2; 696 } else { 697 pmp->pm_fatmask = FAT16_MASK; 698 pmp->pm_fatmult = 2; 699 pmp->pm_fatdiv = 1; 700 } 701 } else if (pmp->pm_fatmask == 0) { 702 if (pmp->pm_maxcluster 703 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 704 /* 705 * This will usually be a floppy disk. This size makes 706 * sure that one FAT entry will not be split across 707 * multiple blocks. 708 */ 709 pmp->pm_fatmask = FAT12_MASK; 710 pmp->pm_fatmult = 3; 711 pmp->pm_fatdiv = 2; 712 } else { 713 pmp->pm_fatmask = FAT16_MASK; 714 pmp->pm_fatmult = 2; 715 pmp->pm_fatdiv = 1; 716 } 717 } 718 if (FAT12(pmp)) 719 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 720 else 721 pmp->pm_fatblocksize = MAXBSIZE; 722 723 pmp->pm_fatblocksec = pmp->pm_fatblocksize / pmp->pm_BytesPerSec; 724 pmp->pm_bnshift = ffs(pmp->pm_BytesPerSec) - 1; 725 726 /* 727 * Compute mask and shift value for isolating cluster relative byte 728 * offsets and cluster numbers from a file offset. 729 */ 730 pmp->pm_bpcluster = SecPerClust * pmp->pm_BytesPerSec; 731 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 732 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 733 734 /* 735 * Check for valid cluster size 736 * must be a power of 2 737 */ 738 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 739 DPRINTF("bpcluster %lu cnshift %lu", pmp->pm_bpcluster, 740 pmp->pm_cnshift); 741 error = EINVAL; 742 goto error_exit; 743 } 744 745 /* 746 * Cluster size must be within limit of MAXBSIZE. 747 * Many FAT filesystems will not have clusters larger than 748 * 32KiB due to limits in Windows versions before Vista. 749 */ 750 if (pmp->pm_bpcluster > MAXBSIZE) { 751 DPRINTF("bpcluster %lu > MAXBSIZE %d", 752 pmp->pm_bpcluster, MAXBSIZE); 753 error = EINVAL; 754 goto error_exit; 755 } 756 757 /* 758 * Release the bootsector buffer. 759 */ 760 brelse(bp, BC_AGE); 761 bp = NULL; 762 763 /* 764 * Check FSInfo. 765 */ 766 if (pmp->pm_fsinfo) { 767 struct fsinfo *fp; 768 const int rdsz = roundup(sizeof(*fp), pmp->pm_BytesPerSec); 769 770 /* 771 * XXX If the fsinfo block is stored on media with 772 * 2KB or larger sectors, is the fsinfo structure 773 * padded at the end or in the middle? 774 */ 775 if ((error = bread(devvp, de_bn2kb(pmp, pmp->pm_fsinfo), 776 rdsz, 0, &bp)) != 0) 777 goto error_exit; 778 fp = (struct fsinfo *)bp->b_data; 779 if (!memcmp(fp->fsisig1, "RRaA", 4) 780 && !memcmp(fp->fsisig2, "rrAa", 4) 781 && !memcmp(fp->fsisig3, "\0\0\125\252", 4) 782 && !memcmp(fp->fsisig4, "\0\0\125\252", 4)) 783 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 784 else 785 pmp->pm_fsinfo = 0; 786 brelse(bp, 0); 787 bp = NULL; 788 } 789 790 /* 791 * Check and validate (or perhaps invalidate?) the fsinfo structure? 792 * XXX 793 */ 794 if (pmp->pm_fsinfo) { 795 if ((pmp->pm_nxtfree == 0xffffffffUL) || 796 (pmp->pm_nxtfree > pmp->pm_maxcluster)) 797 pmp->pm_fsinfo = 0; 798 } 799 800 /* 801 * Allocate memory for the bitmap of allocated clusters, and then 802 * fill it in. 803 */ 804 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS) 805 / N_INUSEBITS) 806 * sizeof(*pmp->pm_inusemap), 807 M_MSDOSFSFAT, M_WAITOK); 808 809 /* 810 * fillinusemap() needs pm_devvp. 811 */ 812 pmp->pm_dev = dev; 813 pmp->pm_devvp = devvp; 814 815 /* 816 * Have the inuse map filled in. 817 */ 818 if ((error = fillinusemap(pmp)) != 0) { 819 DPRINTF("fillinusemap %d", error); 820 goto error_exit; 821 } 822 823 /* 824 * If they want FAT updates to be synchronous then let them suffer 825 * the performance degradation in exchange for the on disk copy of 826 * the FAT being correct just about all the time. I suppose this 827 * would be a good thing to turn on if the kernel is still flakey. 828 */ 829 if (mp->mnt_flag & MNT_SYNCHRONOUS) 830 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 831 832 /* 833 * Finish up. 834 */ 835 if (ronly) 836 pmp->pm_flags |= MSDOSFSMNT_RONLY; 837 else 838 pmp->pm_fmod = 1; 839 mp->mnt_data = pmp; 840 mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev; 841 mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_MSDOS); 842 mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; 843 mp->mnt_stat.f_namemax = MSDOSFS_NAMEMAX(pmp); 844 mp->mnt_flag |= MNT_LOCAL; 845 mp->mnt_dev_bshift = pmp->pm_bnshift; 846 mp->mnt_fs_bshift = pmp->pm_cnshift; 847 848 /* 849 * If we ever do quotas for DOS filesystems this would be a place 850 * to fill in the info in the msdosfsmount structure. You dolt, 851 * quotas on dos filesystems make no sense because files have no 852 * owners on dos filesystems. of course there is some empty space 853 * in the directory entry where we could put uid's and gid's. 854 */ 855 856 spec_node_setmountedfs(devvp, mp); 857 858 return (0); 859 860 error_exit: 861 fstrans_unmount(mp); 862 if (bp) 863 brelse(bp, BC_AGE); 864 if (pmp) { 865 if (pmp->pm_inusemap) 866 free(pmp->pm_inusemap, M_MSDOSFSFAT); 867 free(pmp, M_MSDOSFSMNT); 868 mp->mnt_data = NULL; 869 } 870 return (error); 871 } 872 873 int 874 msdosfs_start(struct mount *mp, int flags) 875 { 876 877 return (0); 878 } 879 880 /* 881 * Unmount the filesystem described by mp. 882 */ 883 int 884 msdosfs_unmount(struct mount *mp, int mntflags) 885 { 886 struct msdosfsmount *pmp; 887 int error, flags; 888 889 flags = 0; 890 if (mntflags & MNT_FORCE) 891 flags |= FORCECLOSE; 892 if ((error = vflush(mp, NULLVP, flags)) != 0) 893 return (error); 894 pmp = VFSTOMSDOSFS(mp); 895 if (pmp->pm_devvp->v_type != VBAD) 896 spec_node_setmountedfs(pmp->pm_devvp, NULL); 897 #ifdef MSDOSFS_DEBUG 898 { 899 struct vnode *vp = pmp->pm_devvp; 900 901 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 902 printf("flag %08x, usecount %d, writecount %d, holdcnt %d\n", 903 vp->v_vflag | vp->v_iflag | vp->v_uflag, vp->v_usecount, 904 vp->v_writecount, vp->v_holdcnt); 905 printf("mount %p, op %p\n", 906 vp->v_mount, vp->v_op); 907 printf("freef %p, freeb %p, mount %p\n", 908 vp->v_freelist.tqe_next, vp->v_freelist.tqe_prev, 909 vp->v_mount); 910 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %d, type %d\n", 911 vp->v_cleanblkhd.lh_first, 912 vp->v_dirtyblkhd.lh_first, 913 vp->v_numoutput, vp->v_type); 914 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 915 vp->v_socket, vp->v_tag, 916 ((u_int *)vp->v_data)[0], 917 ((u_int *)vp->v_data)[1]); 918 } 919 #endif 920 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY); 921 (void) VOP_CLOSE(pmp->pm_devvp, 922 pmp->pm_flags & MSDOSFSMNT_RONLY ? FREAD : FREAD|FWRITE, NOCRED); 923 vput(pmp->pm_devvp); 924 msdosfs_fh_destroy(pmp); 925 free(pmp->pm_inusemap, M_MSDOSFSFAT); 926 free(pmp, M_MSDOSFSMNT); 927 mp->mnt_data = NULL; 928 mp->mnt_flag &= ~MNT_LOCAL; 929 fstrans_unmount(mp); 930 return (0); 931 } 932 933 int 934 msdosfs_root(struct mount *mp, struct vnode **vpp) 935 { 936 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 937 int error; 938 939 #ifdef MSDOSFS_DEBUG 940 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 941 #endif 942 if ((error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, vpp)) != 0) 943 return error; 944 error = vn_lock(*vpp, LK_EXCLUSIVE); 945 if (error) { 946 vrele(*vpp); 947 *vpp = NULL; 948 return error; 949 } 950 return 0; 951 } 952 953 int 954 msdosfs_statvfs(struct mount *mp, struct statvfs *sbp) 955 { 956 struct msdosfsmount *pmp; 957 958 pmp = VFSTOMSDOSFS(mp); 959 sbp->f_bsize = pmp->pm_bpcluster; 960 sbp->f_frsize = sbp->f_bsize; 961 sbp->f_iosize = pmp->pm_bpcluster; 962 sbp->f_blocks = pmp->pm_nmbrofclusters; 963 sbp->f_bfree = pmp->pm_freeclustercount; 964 sbp->f_bavail = pmp->pm_freeclustercount; 965 sbp->f_bresvd = 0; 966 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 967 sbp->f_ffree = 0; /* what to put in here? */ 968 sbp->f_favail = 0; /* what to put in here? */ 969 sbp->f_fresvd = 0; 970 copy_statvfs_info(sbp, mp); 971 return (0); 972 } 973 974 struct msdosfs_sync_ctx { 975 int waitfor; 976 }; 977 978 static bool 979 msdosfs_sync_selector(void *cl, struct vnode *vp) 980 { 981 struct msdosfs_sync_ctx *c = cl; 982 struct denode *dep; 983 984 dep = VTODE(vp); 985 if (c->waitfor == MNT_LAZY || vp->v_type == VNON || 986 dep == NULL || (((dep->de_flag & 987 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0) && 988 (LIST_EMPTY(&vp->v_dirtyblkhd) && 989 UVM_OBJ_IS_CLEAN(&vp->v_uobj)))) 990 return false; 991 return true; 992 } 993 994 int 995 msdosfs_sync(struct mount *mp, int waitfor, kauth_cred_t cred) 996 { 997 struct vnode *vp; 998 struct vnode_iterator *marker; 999 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 1000 int error, allerror = 0; 1001 struct msdosfs_sync_ctx ctx; 1002 1003 /* 1004 * If we ever switch to not updating all of the FATs all the time, 1005 * this would be the place to update them from the first one. 1006 */ 1007 if (pmp->pm_fmod != 0) { 1008 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 1009 panic("msdosfs_sync: rofs mod"); 1010 else { 1011 /* update FATs here */ 1012 } 1013 } 1014 fstrans_start(mp, FSTRANS_SHARED); 1015 /* 1016 * Write back each (modified) denode. 1017 */ 1018 vfs_vnode_iterator_init(mp, &marker); 1019 ctx.waitfor = waitfor; 1020 while ((vp = vfs_vnode_iterator_next(marker, msdosfs_sync_selector, 1021 &ctx))) 1022 { 1023 error = vn_lock(vp, LK_EXCLUSIVE); 1024 if (error) { 1025 vrele(vp); 1026 continue; 1027 } 1028 if ((error = VOP_FSYNC(vp, cred, 1029 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0)) != 0) 1030 allerror = error; 1031 vput(vp); 1032 } 1033 vfs_vnode_iterator_destroy(marker); 1034 1035 /* 1036 * Force stale file system control information to be flushed. 1037 */ 1038 if ((error = VOP_FSYNC(pmp->pm_devvp, cred, 1039 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0)) != 0) 1040 allerror = error; 1041 fstrans_done(mp); 1042 return (allerror); 1043 } 1044 1045 int 1046 msdosfs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) 1047 { 1048 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 1049 struct defid defh; 1050 uint32_t gen; 1051 int error; 1052 1053 if (fhp->fid_len != sizeof(struct defid)) { 1054 DPRINTF("fid_len %d %zd", fhp->fid_len, sizeof(struct defid)); 1055 return EINVAL; 1056 } 1057 memcpy(&defh, fhp, sizeof(defh)); 1058 error = msdosfs_fh_lookup(pmp, defh.defid_dirclust, defh.defid_dirofs, 1059 &gen); 1060 if (error == 0 && gen != defh.defid_gen) 1061 error = ESTALE; 1062 if (error) { 1063 *vpp = NULLVP; 1064 return error; 1065 } 1066 error = deget(pmp, defh.defid_dirclust, defh.defid_dirofs, vpp); 1067 if (error) { 1068 DPRINTF("deget %d", error); 1069 *vpp = NULLVP; 1070 return error; 1071 } 1072 error = vn_lock(*vpp, LK_EXCLUSIVE); 1073 if (error) { 1074 vrele(*vpp); 1075 *vpp = NULLVP; 1076 return error; 1077 } 1078 return 0; 1079 } 1080 1081 int 1082 msdosfs_vptofh(struct vnode *vp, struct fid *fhp, size_t *fh_size) 1083 { 1084 struct msdosfsmount *pmp = VFSTOMSDOSFS(vp->v_mount); 1085 struct denode *dep; 1086 struct defid defh; 1087 int error; 1088 1089 if (*fh_size < sizeof(struct defid)) { 1090 *fh_size = sizeof(struct defid); 1091 return E2BIG; 1092 } 1093 *fh_size = sizeof(struct defid); 1094 dep = VTODE(vp); 1095 memset(&defh, 0, sizeof(defh)); 1096 defh.defid_len = sizeof(struct defid); 1097 defh.defid_dirclust = dep->de_dirclust; 1098 defh.defid_dirofs = dep->de_diroffset; 1099 error = msdosfs_fh_enter(pmp, dep->de_dirclust, dep->de_diroffset, 1100 &defh.defid_gen); 1101 if (error == 0) 1102 memcpy(fhp, &defh, sizeof(defh)); 1103 return error; 1104 } 1105 1106 int 1107 msdosfs_vget(struct mount *mp, ino_t ino, 1108 struct vnode **vpp) 1109 { 1110 1111 return (EOPNOTSUPP); 1112 } 1113 1114 int 1115 msdosfs_suspendctl(struct mount *mp, int cmd) 1116 { 1117 int error; 1118 struct lwp *l = curlwp; 1119 1120 switch (cmd) { 1121 case SUSPEND_SUSPEND: 1122 if ((error = fstrans_setstate(mp, FSTRANS_SUSPENDING)) != 0) 1123 return error; 1124 error = msdosfs_sync(mp, MNT_WAIT, l->l_proc->p_cred); 1125 if (error == 0) 1126 error = fstrans_setstate(mp, FSTRANS_SUSPENDED); 1127 if (error != 0) { 1128 (void) fstrans_setstate(mp, FSTRANS_NORMAL); 1129 return error; 1130 } 1131 return 0; 1132 1133 case SUSPEND_RESUME: 1134 return fstrans_setstate(mp, FSTRANS_NORMAL); 1135 1136 default: 1137 return EINVAL; 1138 } 1139 } 1140