1 /* $NetBSD: msdosfs_vfsops.c,v 1.115 2014/07/18 17:24:34 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 1.115 2014/07/18 17:24:34 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 ((error = bread(devvp, 0, secsize, NOCRED, 0, &bp)) != 0) 514 goto error_exit; 515 bsp = (union bootsector *)bp->b_data; 516 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 517 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 518 b710 = (struct byte_bpb710 *)bsp->bs710.bsBPB; 519 520 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 521 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 522 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 523 DPRINTF("bootsig0 %d bootsig1 %d", 524 bsp->bs50.bsBootSectSig0, 525 bsp->bs50.bsBootSectSig1); 526 error = EINVAL; 527 goto error_exit; 528 } 529 } 530 531 pmp = malloc(sizeof(*pmp), M_MSDOSFSMNT, M_WAITOK|M_ZERO); 532 pmp->pm_mountp = mp; 533 534 /* 535 * Compute several useful quantities from the bpb in the 536 * bootsector. Copy in the dos 5 variant of the bpb then fix up 537 * the fields that are different between dos 5 and dos 3.3. 538 */ 539 SecPerClust = b50->bpbSecPerClust; 540 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 541 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 542 pmp->pm_FATs = b50->bpbFATs; 543 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 544 pmp->pm_Sectors = getushort(b50->bpbSectors); 545 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 546 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 547 pmp->pm_Heads = getushort(b50->bpbHeads); 548 pmp->pm_Media = b50->bpbMedia; 549 550 if (pmp->pm_Sectors == 0) { 551 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 552 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 553 } else { 554 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 555 pmp->pm_HugeSectors = pmp->pm_Sectors; 556 } 557 558 /* 559 * Sanity checks, from the FAT specification: 560 * - sectors per cluster: >= 1, power of 2 561 * - logical sector size: >= 1, power of 2 562 * - cluster size: <= max FS block size 563 * - number of sectors: >= 1 564 */ 565 if ((SecPerClust == 0) || !powerof2(SecPerClust) || 566 (pmp->pm_BytesPerSec == 0) || !powerof2(pmp->pm_BytesPerSec) || 567 (SecPerClust * pmp->pm_BytesPerSec > MAXBSIZE) || 568 (pmp->pm_HugeSectors == 0)) { 569 DPRINTF("consistency checks"); 570 error = EINVAL; 571 goto error_exit; 572 } 573 574 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS) && 575 (pmp->pm_SecPerTrack > 63)) { 576 DPRINTF("SecPerTrack %d", pmp->pm_SecPerTrack); 577 error = EINVAL; 578 goto error_exit; 579 } 580 581 if (pmp->pm_RootDirEnts == 0) { 582 unsigned short FSVers = getushort(b710->bpbFSVers); 583 unsigned short ExtFlags = getushort(b710->bpbExtFlags); 584 /* 585 * Some say that bsBootSectSig[23] must be zero, but 586 * Windows does not require this and some digital cameras 587 * do not set these to zero. Therefore, do not insist. 588 */ 589 if (pmp->pm_Sectors || pmp->pm_FATsecs || FSVers) { 590 DPRINTF("Sectors %d FATsecs %lu FSVers %d", 591 pmp->pm_Sectors, pmp->pm_FATsecs, FSVers); 592 error = EINVAL; 593 goto error_exit; 594 } 595 pmp->pm_fatmask = FAT32_MASK; 596 pmp->pm_fatmult = 4; 597 pmp->pm_fatdiv = 1; 598 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 599 600 /* Mirroring is enabled if the FATMIRROR bit is not set. */ 601 if ((ExtFlags & FATMIRROR) == 0) 602 pmp->pm_flags |= MSDOSFS_FATMIRROR; 603 else 604 pmp->pm_curfat = ExtFlags & FATNUM; 605 } else 606 pmp->pm_flags |= MSDOSFS_FATMIRROR; 607 608 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 609 if (FAT32(pmp)) { 610 /* GEMDOS doesn't know FAT32. */ 611 DPRINTF("FAT32 for GEMDOS"); 612 error = EINVAL; 613 goto error_exit; 614 } 615 616 /* 617 * Check a few values (could do some more): 618 * - logical sector size: >= block size 619 * - number of sectors: <= size of partition 620 */ 621 if ((pmp->pm_BytesPerSec < GEMDOSFS_BSIZE) || 622 (pmp->pm_HugeSectors * 623 (pmp->pm_BytesPerSec / GEMDOSFS_BSIZE) > psize)) { 624 DPRINTF("consistency checks for GEMDOS"); 625 error = EINVAL; 626 goto error_exit; 627 } 628 /* 629 * XXX - Many parts of the msdosfs driver seem to assume that 630 * the number of bytes per logical sector (BytesPerSec) will 631 * always be the same as the number of bytes per disk block 632 * Let's pretend it is. 633 */ 634 BlkPerSec = pmp->pm_BytesPerSec / GEMDOSFS_BSIZE; 635 pmp->pm_BytesPerSec = GEMDOSFS_BSIZE; 636 pmp->pm_HugeSectors *= BlkPerSec; 637 pmp->pm_HiddenSects *= BlkPerSec; 638 pmp->pm_ResSectors *= BlkPerSec; 639 pmp->pm_Sectors *= BlkPerSec; 640 pmp->pm_FATsecs *= BlkPerSec; 641 SecPerClust *= BlkPerSec; 642 } 643 644 /* Check that fs has nonzero FAT size */ 645 if (pmp->pm_FATsecs == 0) { 646 DPRINTF("FATsecs is 0"); 647 error = EINVAL; 648 goto error_exit; 649 } 650 651 pmp->pm_fatblk = pmp->pm_ResSectors; 652 if (FAT32(pmp)) { 653 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 654 pmp->pm_firstcluster = pmp->pm_fatblk 655 + (pmp->pm_FATs * pmp->pm_FATsecs); 656 pmp->pm_fsinfo = getushort(b710->bpbFSInfo); 657 } else { 658 pmp->pm_rootdirblk = pmp->pm_fatblk + 659 (pmp->pm_FATs * pmp->pm_FATsecs); 660 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 661 + pmp->pm_BytesPerSec - 1) 662 / pmp->pm_BytesPerSec;/* in sectors */ 663 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 664 } 665 666 pmp->pm_nmbrofclusters = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 667 SecPerClust; 668 pmp->pm_maxcluster = pmp->pm_nmbrofclusters + 1; 669 pmp->pm_fatsize = pmp->pm_FATsecs * pmp->pm_BytesPerSec; 670 671 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 672 if (pmp->pm_nmbrofclusters <= (0xff0 - 2)) { 673 pmp->pm_fatmask = FAT12_MASK; 674 pmp->pm_fatmult = 3; 675 pmp->pm_fatdiv = 2; 676 } else { 677 pmp->pm_fatmask = FAT16_MASK; 678 pmp->pm_fatmult = 2; 679 pmp->pm_fatdiv = 1; 680 } 681 } else if (pmp->pm_fatmask == 0) { 682 if (pmp->pm_maxcluster 683 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 684 /* 685 * This will usually be a floppy disk. This size makes 686 * sure that one FAT entry will not be split across 687 * multiple blocks. 688 */ 689 pmp->pm_fatmask = FAT12_MASK; 690 pmp->pm_fatmult = 3; 691 pmp->pm_fatdiv = 2; 692 } else { 693 pmp->pm_fatmask = FAT16_MASK; 694 pmp->pm_fatmult = 2; 695 pmp->pm_fatdiv = 1; 696 } 697 } 698 if (FAT12(pmp)) 699 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 700 else 701 pmp->pm_fatblocksize = MAXBSIZE; 702 703 pmp->pm_fatblocksec = pmp->pm_fatblocksize / pmp->pm_BytesPerSec; 704 pmp->pm_bnshift = ffs(pmp->pm_BytesPerSec) - 1; 705 706 /* 707 * Compute mask and shift value for isolating cluster relative byte 708 * offsets and cluster numbers from a file offset. 709 */ 710 pmp->pm_bpcluster = SecPerClust * pmp->pm_BytesPerSec; 711 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 712 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 713 714 /* 715 * Check for valid cluster size 716 * must be a power of 2 717 */ 718 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 719 DPRINTF("bpcluster %lu cnshift %lu", pmp->pm_bpcluster, 720 pmp->pm_cnshift); 721 error = EINVAL; 722 goto error_exit; 723 } 724 725 /* 726 * Cluster size must be within limit of MAXBSIZE. 727 * Many FAT filesystems will not have clusters larger than 728 * 32KiB due to limits in Windows versions before Vista. 729 */ 730 if (pmp->pm_bpcluster > MAXBSIZE) { 731 DPRINTF("bpcluster %lu > MAXBSIZE %d", 732 pmp->pm_bpcluster, MAXBSIZE); 733 error = EINVAL; 734 goto error_exit; 735 } 736 737 /* 738 * Release the bootsector buffer. 739 */ 740 brelse(bp, BC_AGE); 741 bp = NULL; 742 743 /* 744 * Check FSInfo. 745 */ 746 if (pmp->pm_fsinfo) { 747 struct fsinfo *fp; 748 const int rdsz = roundup(sizeof(*fp), pmp->pm_BytesPerSec); 749 750 /* 751 * XXX If the fsinfo block is stored on media with 752 * 2KB or larger sectors, is the fsinfo structure 753 * padded at the end or in the middle? 754 */ 755 if ((error = bread(devvp, de_bn2kb(pmp, pmp->pm_fsinfo), 756 rdsz, NOCRED, 0, &bp)) != 0) 757 goto error_exit; 758 fp = (struct fsinfo *)bp->b_data; 759 if (!memcmp(fp->fsisig1, "RRaA", 4) 760 && !memcmp(fp->fsisig2, "rrAa", 4) 761 && !memcmp(fp->fsisig3, "\0\0\125\252", 4) 762 && !memcmp(fp->fsisig4, "\0\0\125\252", 4)) 763 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 764 else 765 pmp->pm_fsinfo = 0; 766 brelse(bp, 0); 767 bp = NULL; 768 } 769 770 /* 771 * Check and validate (or perhaps invalidate?) the fsinfo structure? 772 * XXX 773 */ 774 if (pmp->pm_fsinfo) { 775 if ((pmp->pm_nxtfree == 0xffffffffUL) || 776 (pmp->pm_nxtfree > pmp->pm_maxcluster)) 777 pmp->pm_fsinfo = 0; 778 } 779 780 /* 781 * Allocate memory for the bitmap of allocated clusters, and then 782 * fill it in. 783 */ 784 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS) 785 / N_INUSEBITS) 786 * sizeof(*pmp->pm_inusemap), 787 M_MSDOSFSFAT, M_WAITOK); 788 789 /* 790 * fillinusemap() needs pm_devvp. 791 */ 792 pmp->pm_dev = dev; 793 pmp->pm_devvp = devvp; 794 795 /* 796 * Have the inuse map filled in. 797 */ 798 if ((error = fillinusemap(pmp)) != 0) { 799 DPRINTF("fillinusemap %d", error); 800 goto error_exit; 801 } 802 803 /* 804 * If they want FAT updates to be synchronous then let them suffer 805 * the performance degradation in exchange for the on disk copy of 806 * the FAT being correct just about all the time. I suppose this 807 * would be a good thing to turn on if the kernel is still flakey. 808 */ 809 if (mp->mnt_flag & MNT_SYNCHRONOUS) 810 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 811 812 /* 813 * Finish up. 814 */ 815 if (ronly) 816 pmp->pm_flags |= MSDOSFSMNT_RONLY; 817 else 818 pmp->pm_fmod = 1; 819 mp->mnt_data = pmp; 820 mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev; 821 mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_MSDOS); 822 mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; 823 mp->mnt_stat.f_namemax = MSDOSFS_NAMEMAX(pmp); 824 mp->mnt_flag |= MNT_LOCAL; 825 mp->mnt_dev_bshift = pmp->pm_bnshift; 826 mp->mnt_fs_bshift = pmp->pm_cnshift; 827 828 /* 829 * If we ever do quotas for DOS filesystems this would be a place 830 * to fill in the info in the msdosfsmount structure. You dolt, 831 * quotas on dos filesystems make no sense because files have no 832 * owners on dos filesystems. of course there is some empty space 833 * in the directory entry where we could put uid's and gid's. 834 */ 835 836 spec_node_setmountedfs(devvp, mp); 837 838 return (0); 839 840 error_exit: 841 fstrans_unmount(mp); 842 if (bp) 843 brelse(bp, BC_AGE); 844 if (pmp) { 845 if (pmp->pm_inusemap) 846 free(pmp->pm_inusemap, M_MSDOSFSFAT); 847 free(pmp, M_MSDOSFSMNT); 848 mp->mnt_data = NULL; 849 } 850 return (error); 851 } 852 853 int 854 msdosfs_start(struct mount *mp, int flags) 855 { 856 857 return (0); 858 } 859 860 /* 861 * Unmount the filesystem described by mp. 862 */ 863 int 864 msdosfs_unmount(struct mount *mp, int mntflags) 865 { 866 struct msdosfsmount *pmp; 867 int error, flags; 868 869 flags = 0; 870 if (mntflags & MNT_FORCE) 871 flags |= FORCECLOSE; 872 if ((error = vflush(mp, NULLVP, flags)) != 0) 873 return (error); 874 pmp = VFSTOMSDOSFS(mp); 875 if (pmp->pm_devvp->v_type != VBAD) 876 spec_node_setmountedfs(pmp->pm_devvp, NULL); 877 #ifdef MSDOSFS_DEBUG 878 { 879 struct vnode *vp = pmp->pm_devvp; 880 881 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 882 printf("flag %08x, usecount %d, writecount %d, holdcnt %d\n", 883 vp->v_vflag | vp->v_iflag | vp->v_uflag, vp->v_usecount, 884 vp->v_writecount, vp->v_holdcnt); 885 printf("mount %p, op %p\n", 886 vp->v_mount, vp->v_op); 887 printf("freef %p, freeb %p, mount %p\n", 888 vp->v_freelist.tqe_next, vp->v_freelist.tqe_prev, 889 vp->v_mount); 890 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %d, type %d\n", 891 vp->v_cleanblkhd.lh_first, 892 vp->v_dirtyblkhd.lh_first, 893 vp->v_numoutput, vp->v_type); 894 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 895 vp->v_socket, vp->v_tag, 896 ((u_int *)vp->v_data)[0], 897 ((u_int *)vp->v_data)[1]); 898 } 899 #endif 900 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY); 901 (void) VOP_CLOSE(pmp->pm_devvp, 902 pmp->pm_flags & MSDOSFSMNT_RONLY ? FREAD : FREAD|FWRITE, NOCRED); 903 vput(pmp->pm_devvp); 904 msdosfs_fh_destroy(pmp); 905 free(pmp->pm_inusemap, M_MSDOSFSFAT); 906 free(pmp, M_MSDOSFSMNT); 907 mp->mnt_data = NULL; 908 mp->mnt_flag &= ~MNT_LOCAL; 909 fstrans_unmount(mp); 910 return (0); 911 } 912 913 int 914 msdosfs_root(struct mount *mp, struct vnode **vpp) 915 { 916 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 917 int error; 918 919 #ifdef MSDOSFS_DEBUG 920 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 921 #endif 922 if ((error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, vpp)) != 0) 923 return error; 924 error = vn_lock(*vpp, LK_EXCLUSIVE); 925 if (error) { 926 vrele(*vpp); 927 *vpp = NULL; 928 return error; 929 } 930 return 0; 931 } 932 933 int 934 msdosfs_statvfs(struct mount *mp, struct statvfs *sbp) 935 { 936 struct msdosfsmount *pmp; 937 938 pmp = VFSTOMSDOSFS(mp); 939 sbp->f_bsize = pmp->pm_bpcluster; 940 sbp->f_frsize = sbp->f_bsize; 941 sbp->f_iosize = pmp->pm_bpcluster; 942 sbp->f_blocks = pmp->pm_nmbrofclusters; 943 sbp->f_bfree = pmp->pm_freeclustercount; 944 sbp->f_bavail = pmp->pm_freeclustercount; 945 sbp->f_bresvd = 0; 946 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 947 sbp->f_ffree = 0; /* what to put in here? */ 948 sbp->f_favail = 0; /* what to put in here? */ 949 sbp->f_fresvd = 0; 950 copy_statvfs_info(sbp, mp); 951 return (0); 952 } 953 954 struct msdosfs_sync_ctx { 955 int waitfor; 956 }; 957 958 static bool 959 msdosfs_sync_selector(void *cl, struct vnode *vp) 960 { 961 struct msdosfs_sync_ctx *c = cl; 962 struct denode *dep; 963 964 dep = VTODE(vp); 965 if (c->waitfor == MNT_LAZY || vp->v_type == VNON || 966 dep == NULL || (((dep->de_flag & 967 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0) && 968 (LIST_EMPTY(&vp->v_dirtyblkhd) && 969 UVM_OBJ_IS_CLEAN(&vp->v_uobj)))) 970 return false; 971 return true; 972 } 973 974 int 975 msdosfs_sync(struct mount *mp, int waitfor, kauth_cred_t cred) 976 { 977 struct vnode *vp; 978 struct vnode_iterator *marker; 979 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 980 int error, allerror = 0; 981 struct msdosfs_sync_ctx ctx; 982 983 /* 984 * If we ever switch to not updating all of the FATs all the time, 985 * this would be the place to update them from the first one. 986 */ 987 if (pmp->pm_fmod != 0) { 988 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 989 panic("msdosfs_sync: rofs mod"); 990 else { 991 /* update FATs here */ 992 } 993 } 994 fstrans_start(mp, FSTRANS_SHARED); 995 /* 996 * Write back each (modified) denode. 997 */ 998 vfs_vnode_iterator_init(mp, &marker); 999 ctx.waitfor = waitfor; 1000 while ((vp = vfs_vnode_iterator_next(marker, msdosfs_sync_selector, 1001 &ctx))) 1002 { 1003 error = vn_lock(vp, LK_EXCLUSIVE); 1004 if (error) { 1005 vrele(vp); 1006 continue; 1007 } 1008 if ((error = VOP_FSYNC(vp, cred, 1009 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0)) != 0) 1010 allerror = error; 1011 vput(vp); 1012 } 1013 vfs_vnode_iterator_destroy(marker); 1014 1015 /* 1016 * Force stale file system control information to be flushed. 1017 */ 1018 if ((error = VOP_FSYNC(pmp->pm_devvp, cred, 1019 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0)) != 0) 1020 allerror = error; 1021 fstrans_done(mp); 1022 return (allerror); 1023 } 1024 1025 int 1026 msdosfs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) 1027 { 1028 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 1029 struct defid defh; 1030 uint32_t gen; 1031 int error; 1032 1033 if (fhp->fid_len != sizeof(struct defid)) { 1034 DPRINTF("fid_len %d %zd", fhp->fid_len, sizeof(struct defid)); 1035 return EINVAL; 1036 } 1037 memcpy(&defh, fhp, sizeof(defh)); 1038 error = msdosfs_fh_lookup(pmp, defh.defid_dirclust, defh.defid_dirofs, 1039 &gen); 1040 if (error == 0 && gen != defh.defid_gen) 1041 error = ESTALE; 1042 if (error) { 1043 *vpp = NULLVP; 1044 return error; 1045 } 1046 error = deget(pmp, defh.defid_dirclust, defh.defid_dirofs, vpp); 1047 if (error) { 1048 DPRINTF("deget %d", error); 1049 *vpp = NULLVP; 1050 return error; 1051 } 1052 error = vn_lock(*vpp, LK_EXCLUSIVE); 1053 if (error) { 1054 vrele(*vpp); 1055 *vpp = NULLVP; 1056 return error; 1057 } 1058 return 0; 1059 } 1060 1061 int 1062 msdosfs_vptofh(struct vnode *vp, struct fid *fhp, size_t *fh_size) 1063 { 1064 struct msdosfsmount *pmp = VFSTOMSDOSFS(vp->v_mount); 1065 struct denode *dep; 1066 struct defid defh; 1067 int error; 1068 1069 if (*fh_size < sizeof(struct defid)) { 1070 *fh_size = sizeof(struct defid); 1071 return E2BIG; 1072 } 1073 *fh_size = sizeof(struct defid); 1074 dep = VTODE(vp); 1075 memset(&defh, 0, sizeof(defh)); 1076 defh.defid_len = sizeof(struct defid); 1077 defh.defid_dirclust = dep->de_dirclust; 1078 defh.defid_dirofs = dep->de_diroffset; 1079 error = msdosfs_fh_enter(pmp, dep->de_dirclust, dep->de_diroffset, 1080 &defh.defid_gen); 1081 if (error == 0) 1082 memcpy(fhp, &defh, sizeof(defh)); 1083 return error; 1084 } 1085 1086 int 1087 msdosfs_vget(struct mount *mp, ino_t ino, 1088 struct vnode **vpp) 1089 { 1090 1091 return (EOPNOTSUPP); 1092 } 1093 1094 int 1095 msdosfs_suspendctl(struct mount *mp, int cmd) 1096 { 1097 int error; 1098 struct lwp *l = curlwp; 1099 1100 switch (cmd) { 1101 case SUSPEND_SUSPEND: 1102 if ((error = fstrans_setstate(mp, FSTRANS_SUSPENDING)) != 0) 1103 return error; 1104 error = msdosfs_sync(mp, MNT_WAIT, l->l_proc->p_cred); 1105 if (error == 0) 1106 error = fstrans_setstate(mp, FSTRANS_SUSPENDED); 1107 if (error != 0) { 1108 (void) fstrans_setstate(mp, FSTRANS_NORMAL); 1109 return error; 1110 } 1111 return 0; 1112 1113 case SUSPEND_RESUME: 1114 return fstrans_setstate(mp, FSTRANS_NORMAL); 1115 1116 default: 1117 return EINVAL; 1118 } 1119 } 1120