1 /* $NetBSD: msdosfs_vfsops.c,v 1.93 2011/11/14 18:35:13 hannken 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 1.93 2011/11/14 18:35:13 hannken 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(a) uprintf a 92 #else 93 #define DPRINTF(a) 94 #endif 95 96 #define MSDOSFS_NAMEMAX(pmp) \ 97 (pmp)->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12 98 99 VFS_PROTOS(msdosfs); 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 #define ROOTNAME "root_device" 111 112 static struct sysctllog *msdosfs_sysctl_log; 113 114 extern const struct vnodeopv_desc msdosfs_vnodeop_opv_desc; 115 116 const struct vnodeopv_desc * const msdosfs_vnodeopv_descs[] = { 117 &msdosfs_vnodeop_opv_desc, 118 NULL, 119 }; 120 121 struct vfsops msdosfs_vfsops = { 122 MOUNT_MSDOS, 123 sizeof (struct msdosfs_args), 124 msdosfs_mount, 125 msdosfs_start, 126 msdosfs_unmount, 127 msdosfs_root, 128 (void *)eopnotsupp, /* vfs_quotactl */ 129 msdosfs_statvfs, 130 msdosfs_sync, 131 msdosfs_vget, 132 msdosfs_fhtovp, 133 msdosfs_vptofh, 134 msdosfs_init, 135 msdosfs_reinit, 136 msdosfs_done, 137 msdosfs_mountroot, 138 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 139 vfs_stdextattrctl, 140 msdosfs_suspendctl, 141 genfs_renamelock_enter, 142 genfs_renamelock_exit, 143 (void *)eopnotsupp, 144 msdosfs_vnodeopv_descs, 145 0, 146 { NULL, NULL }, 147 }; 148 149 static int 150 msdos_modcmd(modcmd_t cmd, void *arg) 151 { 152 int error; 153 154 switch (cmd) { 155 case MODULE_CMD_INIT: 156 error = vfs_attach(&msdosfs_vfsops); 157 if (error != 0) 158 break; 159 sysctl_createv(&msdosfs_sysctl_log, 0, NULL, NULL, 160 CTLFLAG_PERMANENT, 161 CTLTYPE_NODE, "vfs", NULL, 162 NULL, 0, NULL, 0, 163 CTL_VFS, CTL_EOL); 164 sysctl_createv(&msdosfs_sysctl_log, 0, NULL, NULL, 165 CTLFLAG_PERMANENT, 166 CTLTYPE_NODE, "msdosfs", 167 SYSCTL_DESCR("MS-DOS file system"), 168 NULL, 0, NULL, 0, 169 CTL_VFS, 4, CTL_EOL); 170 /* 171 * XXX the "4" above could be dynamic, thereby eliminating one 172 * more instance of the "number to vfs" mapping problem, but 173 * "4" is the order as taken from sys/mount.h 174 */ 175 break; 176 case MODULE_CMD_FINI: 177 error = vfs_detach(&msdosfs_vfsops); 178 if (error != 0) 179 break; 180 sysctl_teardown(&msdosfs_sysctl_log); 181 break; 182 default: 183 error = ENOTTY; 184 break; 185 } 186 187 return (error); 188 } 189 190 static int 191 update_mp(struct mount *mp, struct msdosfs_args *argp) 192 { 193 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 194 int error; 195 196 pmp->pm_gid = argp->gid; 197 pmp->pm_uid = argp->uid; 198 pmp->pm_mask = argp->mask & ALLPERMS; 199 pmp->pm_dirmask = argp->dirmask & ALLPERMS; 200 pmp->pm_gmtoff = argp->gmtoff; 201 pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT; 202 203 /* 204 * GEMDOS knows nothing about win95 long filenames 205 */ 206 if (pmp->pm_flags & MSDOSFSMNT_GEMDOSFS) 207 pmp->pm_flags |= MSDOSFSMNT_NOWIN95; 208 209 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 210 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 211 else if (!(pmp->pm_flags & 212 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 213 struct vnode *rtvp; 214 215 /* 216 * Try to divine whether to support Win'95 long filenames 217 */ 218 if (FAT32(pmp)) 219 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 220 else { 221 if ((error = msdosfs_root(mp, &rtvp)) != 0) 222 return error; 223 pmp->pm_flags |= findwin95(VTODE(rtvp)) 224 ? MSDOSFSMNT_LONGNAME 225 : MSDOSFSMNT_SHORTNAME; 226 vput(rtvp); 227 } 228 } 229 230 mp->mnt_stat.f_namemax = MSDOSFS_NAMEMAX(pmp); 231 232 return 0; 233 } 234 235 int 236 msdosfs_mountroot(void) 237 { 238 struct mount *mp; 239 struct lwp *l = curlwp; /* XXX */ 240 int error; 241 struct msdosfs_args args; 242 243 if (device_class(root_device) != DV_DISK) 244 return (ENODEV); 245 246 if ((error = vfs_rootmountalloc(MOUNT_MSDOS, "root_device", &mp))) { 247 vrele(rootvp); 248 return (error); 249 } 250 251 args.flags = MSDOSFSMNT_VERSIONED; 252 args.uid = 0; 253 args.gid = 0; 254 args.mask = 0777; 255 args.version = MSDOSFSMNT_VERSION; 256 args.dirmask = 0777; 257 258 if ((error = msdosfs_mountfs(rootvp, mp, l, &args)) != 0) { 259 vfs_unbusy(mp, false, NULL); 260 vfs_destroy(mp); 261 return (error); 262 } 263 264 if ((error = update_mp(mp, &args)) != 0) { 265 (void)msdosfs_unmount(mp, 0); 266 vfs_unbusy(mp, false, NULL); 267 vfs_destroy(mp); 268 vrele(rootvp); 269 return (error); 270 } 271 272 mutex_enter(&mountlist_lock); 273 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 274 mutex_exit(&mountlist_lock); 275 (void)msdosfs_statvfs(mp, &mp->mnt_stat); 276 vfs_unbusy(mp, false, NULL); 277 return (0); 278 } 279 280 /* 281 * mp - path - addr in user space of mount point (ie /usr or whatever) 282 * data - addr in user space of mount params including the name of the block 283 * special file to treat as a filesystem. 284 */ 285 int 286 msdosfs_mount(struct mount *mp, const char *path, void *data, size_t *data_len) 287 { 288 struct lwp *l = curlwp; 289 struct vnode *devvp; /* vnode for blk device to mount */ 290 struct msdosfs_args *args = data; /* holds data from mount request */ 291 /* msdosfs specific mount control block */ 292 struct msdosfsmount *pmp = NULL; 293 int error, flags; 294 mode_t accessmode; 295 296 if (*data_len < sizeof *args) 297 return EINVAL; 298 299 if (mp->mnt_flag & MNT_GETARGS) { 300 pmp = VFSTOMSDOSFS(mp); 301 if (pmp == NULL) 302 return EIO; 303 args->fspec = NULL; 304 args->uid = pmp->pm_uid; 305 args->gid = pmp->pm_gid; 306 args->mask = pmp->pm_mask; 307 args->flags = pmp->pm_flags; 308 args->version = MSDOSFSMNT_VERSION; 309 args->dirmask = pmp->pm_dirmask; 310 args->gmtoff = pmp->pm_gmtoff; 311 *data_len = sizeof *args; 312 return 0; 313 } 314 315 /* 316 * If not versioned (i.e. using old mount_msdos(8)), fill in 317 * the additional structure items with suitable defaults. 318 */ 319 if ((args->flags & MSDOSFSMNT_VERSIONED) == 0) { 320 args->version = 1; 321 args->dirmask = args->mask; 322 } 323 324 /* 325 * Reset GMT offset for pre-v3 mount structure args. 326 */ 327 if (args->version < 3) 328 args->gmtoff = 0; 329 330 /* 331 * If updating, check whether changing from read-only to 332 * read/write; if there is no device name, that's all we do. 333 */ 334 if (mp->mnt_flag & MNT_UPDATE) { 335 pmp = VFSTOMSDOSFS(mp); 336 error = 0; 337 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && 338 (mp->mnt_flag & MNT_RDONLY)) { 339 flags = WRITECLOSE; 340 if (mp->mnt_flag & MNT_FORCE) 341 flags |= FORCECLOSE; 342 error = vflush(mp, NULLVP, flags); 343 } 344 if (!error && (mp->mnt_flag & MNT_RELOAD)) 345 /* not yet implemented */ 346 error = EOPNOTSUPP; 347 if (error) { 348 DPRINTF(("vflush %d\n", error)); 349 return (error); 350 } 351 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && 352 (mp->mnt_iflag & IMNT_WANTRDWR)) { 353 /* 354 * If upgrade to read-write by non-root, then verify 355 * that user has necessary permissions on the device. 356 * 357 * Permission to update a mount is checked higher, so 358 * here we presume updating the mount is okay (for 359 * example, as far as securelevel goes) which leaves us 360 * with the normal check. 361 */ 362 devvp = pmp->pm_devvp; 363 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 364 error = genfs_can_mount(devvp, VREAD | VWRITE, 365 l->l_cred); 366 VOP_UNLOCK(devvp); 367 DPRINTF(("genfs_can_mount %d\n", error)); 368 if (error) 369 return (error); 370 371 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 372 } 373 if (args->fspec == NULL) { 374 DPRINTF(("missing fspec\n")); 375 return EINVAL; 376 } 377 } 378 /* 379 * Not an update, or updating the name: look up the name 380 * and verify that it refers to a sensible block device. 381 */ 382 error = namei_simple_user(args->fspec, 383 NSM_FOLLOW_NOEMULROOT, &devvp); 384 if (error != 0) { 385 DPRINTF(("namei %d\n", error)); 386 return (error); 387 } 388 389 if (devvp->v_type != VBLK) { 390 DPRINTF(("not block\n")); 391 vrele(devvp); 392 return (ENOTBLK); 393 } 394 if (bdevsw_lookup(devvp->v_rdev) == NULL) { 395 DPRINTF(("no block switch\n")); 396 vrele(devvp); 397 return (ENXIO); 398 } 399 /* 400 * If mount by non-root, then verify that user has necessary 401 * permissions on the device. 402 */ 403 accessmode = VREAD; 404 if ((mp->mnt_flag & MNT_RDONLY) == 0) 405 accessmode |= VWRITE; 406 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 407 error = genfs_can_mount(devvp, accessmode, l->l_cred); 408 VOP_UNLOCK(devvp); 409 if (error) { 410 DPRINTF(("genfs_can_mount %d\n", error)); 411 vrele(devvp); 412 return (error); 413 } 414 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 415 int xflags; 416 417 if (mp->mnt_flag & MNT_RDONLY) 418 xflags = FREAD; 419 else 420 xflags = FREAD|FWRITE; 421 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 422 error = VOP_OPEN(devvp, xflags, FSCRED); 423 VOP_UNLOCK(devvp); 424 if (error) { 425 DPRINTF(("VOP_OPEN %d\n", error)); 426 goto fail; 427 } 428 error = msdosfs_mountfs(devvp, mp, l, args); 429 if (error) { 430 DPRINTF(("msdosfs_mountfs %d\n", error)); 431 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 432 (void) VOP_CLOSE(devvp, xflags, NOCRED); 433 VOP_UNLOCK(devvp); 434 goto fail; 435 } 436 #ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 437 pmp = VFSTOMSDOSFS(mp); 438 #endif 439 } else { 440 vrele(devvp); 441 if (devvp != pmp->pm_devvp) { 442 DPRINTF(("devvp %p pmp %p\n", 443 devvp, pmp->pm_devvp)); 444 return (EINVAL); /* needs translation */ 445 } 446 } 447 if ((error = update_mp(mp, args)) != 0) { 448 msdosfs_unmount(mp, MNT_FORCE); 449 DPRINTF(("update_mp %d\n", error)); 450 return error; 451 } 452 453 #ifdef MSDOSFS_DEBUG 454 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 455 #endif 456 return set_statvfs_info(path, UIO_USERSPACE, args->fspec, UIO_USERSPACE, 457 mp->mnt_op->vfs_name, mp, l); 458 459 fail: 460 vrele(devvp); 461 return (error); 462 } 463 464 int 465 msdosfs_mountfs(struct vnode *devvp, struct mount *mp, struct lwp *l, struct msdosfs_args *argp) 466 { 467 struct msdosfsmount *pmp; 468 struct buf *bp; 469 dev_t dev = devvp->v_rdev; 470 union bootsector *bsp; 471 struct byte_bpb33 *b33; 472 struct byte_bpb50 *b50; 473 struct byte_bpb710 *b710; 474 uint8_t SecPerClust; 475 int ronly, error, tmp; 476 int bsize; 477 uint64_t psize; 478 unsigned secsize; 479 480 /* Flush out any old buffers remaining from a previous use. */ 481 if ((error = vinvalbuf(devvp, V_SAVE, l->l_cred, l, 0, 0)) != 0) 482 return (error); 483 484 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 485 486 bp = NULL; /* both used in error_exit */ 487 pmp = NULL; 488 489 error = fstrans_mount(mp); 490 if (error) 491 goto error_exit; 492 493 error = getdisksize(devvp, &psize, &secsize); 494 if (error) { 495 if (argp->flags & MSDOSFSMNT_GEMDOSFS) 496 goto error_exit; 497 498 /* ok, so it failed. we most likely don't need the info */ 499 secsize = DEV_BSIZE; 500 psize = 0; 501 error = 0; 502 } 503 504 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 505 bsize = secsize; 506 if (bsize != 512) { 507 DPRINTF(("Invalid block bsize %d for gemdos\n", bsize)); 508 error = EINVAL; 509 goto error_exit; 510 } 511 } else 512 bsize = 0; 513 514 /* 515 * Read the boot sector of the filesystem, and then check the 516 * boot signature. If not a dos boot sector then error out. 517 */ 518 if ((error = bread(devvp, 0, secsize, NOCRED, 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\n", 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); 537 memset(pmp, 0, sizeof *pmp); 538 pmp->pm_mountp = mp; 539 540 /* 541 * Compute several useful quantities from the bpb in the 542 * bootsector. Copy in the dos 5 variant of the bpb then fix up 543 * the fields that are different between dos 5 and dos 3.3. 544 */ 545 SecPerClust = b50->bpbSecPerClust; 546 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 547 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 548 pmp->pm_FATs = b50->bpbFATs; 549 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 550 pmp->pm_Sectors = getushort(b50->bpbSectors); 551 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 552 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 553 pmp->pm_Heads = getushort(b50->bpbHeads); 554 pmp->pm_Media = b50->bpbMedia; 555 556 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 557 /* XXX - We should probably check more values here */ 558 if (!pmp->pm_BytesPerSec || !SecPerClust 559 || pmp->pm_SecPerTrack > 63) { 560 DPRINTF(("bytespersec %d secperclust %d " 561 "secpertrack %d\n", 562 pmp->pm_BytesPerSec, SecPerClust, 563 pmp->pm_SecPerTrack)); 564 error = EINVAL; 565 goto error_exit; 566 } 567 } 568 569 if (pmp->pm_Sectors == 0) { 570 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 571 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 572 } else { 573 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 574 pmp->pm_HugeSectors = pmp->pm_Sectors; 575 } 576 577 if (pmp->pm_RootDirEnts == 0) { 578 unsigned short vers = getushort(b710->bpbFSVers); 579 /* 580 * Some say that bsBootSectSig[23] must be zero, but 581 * Windows does not require this and some digital cameras 582 * do not set these to zero. Therefore, do not insist. 583 */ 584 if (pmp->pm_Sectors || pmp->pm_FATsecs || vers) { 585 DPRINTF(("sectors %d fatsecs %lu vers %d\n", 586 pmp->pm_Sectors, pmp->pm_FATsecs, vers)); 587 error = EINVAL; 588 goto error_exit; 589 } 590 pmp->pm_fatmask = FAT32_MASK; 591 pmp->pm_fatmult = 4; 592 pmp->pm_fatdiv = 1; 593 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 594 595 /* mirrorring is enabled if the FATMIRROR bit is not set */ 596 if ((getushort(b710->bpbExtFlags) & FATMIRROR) == 0) 597 pmp->pm_flags |= MSDOSFS_FATMIRROR; 598 else 599 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 600 } else 601 pmp->pm_flags |= MSDOSFS_FATMIRROR; 602 603 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 604 if (FAT32(pmp)) { 605 DPRINTF(("fat32 for gemdos\n")); 606 /* 607 * GEMDOS doesn't know fat32. 608 */ 609 error = EINVAL; 610 goto error_exit; 611 } 612 613 /* 614 * Check a few values (could do some more): 615 * - logical sector size: power of 2, >= block size 616 * - sectors per cluster: power of 2, >= 1 617 * - number of sectors: >= 1, <= size of partition 618 */ 619 if ( (SecPerClust == 0) 620 || (SecPerClust & (SecPerClust - 1)) 621 || (pmp->pm_BytesPerSec < bsize) 622 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 623 || (pmp->pm_HugeSectors == 0) 624 || (pmp->pm_HugeSectors * (pmp->pm_BytesPerSec / bsize) 625 > psize)) { 626 DPRINTF(("consistency checks for gemdos\n")); 627 error = EINVAL; 628 goto error_exit; 629 } 630 /* 631 * XXX - Many parts of the msdos fs driver seem to assume that 632 * the number of bytes per logical sector (BytesPerSec) will 633 * always be the same as the number of bytes per disk block 634 * Let's pretend it is. 635 */ 636 tmp = pmp->pm_BytesPerSec / bsize; 637 pmp->pm_BytesPerSec = bsize; 638 pmp->pm_HugeSectors *= tmp; 639 pmp->pm_HiddenSects *= tmp; 640 pmp->pm_ResSectors *= tmp; 641 pmp->pm_Sectors *= tmp; 642 pmp->pm_FATsecs *= tmp; 643 SecPerClust *= tmp; 644 } 645 646 /* Check that fs has nonzero FAT size */ 647 if (pmp->pm_FATsecs == 0) { 648 DPRINTF(("FATsecs is 0\n")); 649 error = EINVAL; 650 goto error_exit; 651 } 652 653 pmp->pm_fatblk = pmp->pm_ResSectors; 654 if (FAT32(pmp)) { 655 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 656 pmp->pm_firstcluster = pmp->pm_fatblk 657 + (pmp->pm_FATs * pmp->pm_FATsecs); 658 pmp->pm_fsinfo = getushort(b710->bpbFSInfo); 659 } else { 660 pmp->pm_rootdirblk = pmp->pm_fatblk + 661 (pmp->pm_FATs * pmp->pm_FATsecs); 662 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 663 + pmp->pm_BytesPerSec - 1) 664 / pmp->pm_BytesPerSec;/* in sectors */ 665 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 666 } 667 668 pmp->pm_nmbrofclusters = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 669 SecPerClust; 670 pmp->pm_maxcluster = pmp->pm_nmbrofclusters + 1; 671 pmp->pm_fatsize = pmp->pm_FATsecs * pmp->pm_BytesPerSec; 672 673 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 674 if (pmp->pm_nmbrofclusters <= (0xff0 - 2)) { 675 pmp->pm_fatmask = FAT12_MASK; 676 pmp->pm_fatmult = 3; 677 pmp->pm_fatdiv = 2; 678 } else { 679 pmp->pm_fatmask = FAT16_MASK; 680 pmp->pm_fatmult = 2; 681 pmp->pm_fatdiv = 1; 682 } 683 } else if (pmp->pm_fatmask == 0) { 684 if (pmp->pm_maxcluster 685 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 686 /* 687 * This will usually be a floppy disk. This size makes 688 * sure that one fat entry will not be split across 689 * multiple blocks. 690 */ 691 pmp->pm_fatmask = FAT12_MASK; 692 pmp->pm_fatmult = 3; 693 pmp->pm_fatdiv = 2; 694 } else { 695 pmp->pm_fatmask = FAT16_MASK; 696 pmp->pm_fatmult = 2; 697 pmp->pm_fatdiv = 1; 698 } 699 } 700 if (FAT12(pmp)) 701 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 702 else 703 pmp->pm_fatblocksize = MAXBSIZE; 704 705 pmp->pm_fatblocksec = pmp->pm_fatblocksize / pmp->pm_BytesPerSec; 706 pmp->pm_bnshift = ffs(pmp->pm_BytesPerSec) - 1; 707 708 /* 709 * Compute mask and shift value for isolating cluster relative byte 710 * offsets and cluster numbers from a file offset. 711 */ 712 pmp->pm_bpcluster = SecPerClust * pmp->pm_BytesPerSec; 713 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 714 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 715 716 /* 717 * Check for valid cluster size 718 * must be a power of 2 719 */ 720 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 721 DPRINTF(("bpcluster %lu cnshift %lu\n", 722 pmp->pm_bpcluster, pmp->pm_cnshift)); 723 error = EINVAL; 724 goto error_exit; 725 } 726 727 /* 728 * Release the bootsector buffer. 729 */ 730 brelse(bp, BC_AGE); 731 bp = NULL; 732 733 /* 734 * Check FSInfo. 735 */ 736 if (pmp->pm_fsinfo) { 737 struct fsinfo *fp; 738 739 /* 740 * XXX If the fsinfo block is stored on media with 741 * 2KB or larger sectors, is the fsinfo structure 742 * padded at the end or in the middle? 743 */ 744 if ((error = bread(devvp, de_bn2kb(pmp, pmp->pm_fsinfo), 745 pmp->pm_BytesPerSec, NOCRED, 0, &bp)) != 0) 746 goto error_exit; 747 fp = (struct fsinfo *)bp->b_data; 748 if (!memcmp(fp->fsisig1, "RRaA", 4) 749 && !memcmp(fp->fsisig2, "rrAa", 4) 750 && !memcmp(fp->fsisig3, "\0\0\125\252", 4) 751 && !memcmp(fp->fsisig4, "\0\0\125\252", 4)) 752 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 753 else 754 pmp->pm_fsinfo = 0; 755 brelse(bp, 0); 756 bp = NULL; 757 } 758 759 /* 760 * Check and validate (or perhaps invalidate?) the fsinfo structure? 761 * XXX 762 */ 763 if (pmp->pm_fsinfo) { 764 if (pmp->pm_nxtfree == (u_long)-1) 765 pmp->pm_fsinfo = 0; 766 } 767 768 /* 769 * Allocate memory for the bitmap of allocated clusters, and then 770 * fill it in. 771 */ 772 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 773 / N_INUSEBITS) 774 * sizeof(*pmp->pm_inusemap), 775 M_MSDOSFSFAT, M_WAITOK); 776 777 /* 778 * fillinusemap() needs pm_devvp. 779 */ 780 pmp->pm_dev = dev; 781 pmp->pm_devvp = devvp; 782 783 /* 784 * Have the inuse map filled in. 785 */ 786 if ((error = fillinusemap(pmp)) != 0) { 787 DPRINTF(("fillinusemap %d\n", error)); 788 goto error_exit; 789 } 790 791 /* 792 * If they want fat updates to be synchronous then let them suffer 793 * the performance degradation in exchange for the on disk copy of 794 * the fat being correct just about all the time. I suppose this 795 * would be a good thing to turn on if the kernel is still flakey. 796 */ 797 if (mp->mnt_flag & MNT_SYNCHRONOUS) 798 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 799 800 /* 801 * Finish up. 802 */ 803 if (ronly) 804 pmp->pm_flags |= MSDOSFSMNT_RONLY; 805 else 806 pmp->pm_fmod = 1; 807 mp->mnt_data = pmp; 808 mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev; 809 mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_MSDOS); 810 mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; 811 mp->mnt_stat.f_namemax = MSDOSFS_NAMEMAX(pmp); 812 mp->mnt_flag |= MNT_LOCAL; 813 mp->mnt_dev_bshift = pmp->pm_bnshift; 814 mp->mnt_fs_bshift = pmp->pm_cnshift; 815 816 /* 817 * If we ever do quotas for DOS filesystems this would be a place 818 * to fill in the info in the msdosfsmount structure. You dolt, 819 * quotas on dos filesystems make no sense because files have no 820 * owners on dos filesystems. of course there is some empty space 821 * in the directory entry where we could put uid's and gid's. 822 */ 823 824 devvp->v_specmountpoint = mp; 825 826 return (0); 827 828 error_exit: 829 fstrans_unmount(mp); 830 if (bp) 831 brelse(bp, BC_AGE); 832 if (pmp) { 833 if (pmp->pm_inusemap) 834 free(pmp->pm_inusemap, M_MSDOSFSFAT); 835 free(pmp, M_MSDOSFSMNT); 836 mp->mnt_data = NULL; 837 } 838 return (error); 839 } 840 841 int 842 msdosfs_start(struct mount *mp, int flags) 843 { 844 845 return (0); 846 } 847 848 /* 849 * Unmount the filesystem described by mp. 850 */ 851 int 852 msdosfs_unmount(struct mount *mp, int mntflags) 853 { 854 struct msdosfsmount *pmp; 855 int error, flags; 856 857 flags = 0; 858 if (mntflags & MNT_FORCE) 859 flags |= FORCECLOSE; 860 if ((error = vflush(mp, NULLVP, flags)) != 0) 861 return (error); 862 pmp = VFSTOMSDOSFS(mp); 863 if (pmp->pm_devvp->v_type != VBAD) 864 pmp->pm_devvp->v_specmountpoint = NULL; 865 #ifdef MSDOSFS_DEBUG 866 { 867 struct vnode *vp = pmp->pm_devvp; 868 869 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 870 printf("flag %08x, usecount %d, writecount %d, holdcnt %d\n", 871 vp->v_vflag | vp->v_iflag | vp->v_uflag, vp->v_usecount, 872 vp->v_writecount, vp->v_holdcnt); 873 printf("mount %p, op %p\n", 874 vp->v_mount, vp->v_op); 875 printf("freef %p, freeb %p, mount %p\n", 876 vp->v_freelist.tqe_next, vp->v_freelist.tqe_prev, 877 vp->v_mount); 878 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %d, type %d\n", 879 vp->v_cleanblkhd.lh_first, 880 vp->v_dirtyblkhd.lh_first, 881 vp->v_numoutput, vp->v_type); 882 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 883 vp->v_socket, vp->v_tag, 884 ((u_int *)vp->v_data)[0], 885 ((u_int *)vp->v_data)[1]); 886 } 887 #endif 888 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY); 889 (void) VOP_CLOSE(pmp->pm_devvp, 890 pmp->pm_flags & MSDOSFSMNT_RONLY ? FREAD : FREAD|FWRITE, NOCRED); 891 vput(pmp->pm_devvp); 892 msdosfs_fh_destroy(pmp); 893 free(pmp->pm_inusemap, M_MSDOSFSFAT); 894 free(pmp, M_MSDOSFSMNT); 895 mp->mnt_data = NULL; 896 mp->mnt_flag &= ~MNT_LOCAL; 897 fstrans_unmount(mp); 898 return (0); 899 } 900 901 int 902 msdosfs_root(struct mount *mp, struct vnode **vpp) 903 { 904 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 905 struct denode *ndep; 906 int error; 907 908 #ifdef MSDOSFS_DEBUG 909 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 910 #endif 911 if ((error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep)) != 0) 912 return (error); 913 *vpp = DETOV(ndep); 914 return (0); 915 } 916 917 int 918 msdosfs_statvfs(struct mount *mp, struct statvfs *sbp) 919 { 920 struct msdosfsmount *pmp; 921 922 pmp = VFSTOMSDOSFS(mp); 923 sbp->f_bsize = pmp->pm_bpcluster; 924 sbp->f_frsize = sbp->f_bsize; 925 sbp->f_iosize = pmp->pm_bpcluster; 926 sbp->f_blocks = pmp->pm_nmbrofclusters; 927 sbp->f_bfree = pmp->pm_freeclustercount; 928 sbp->f_bavail = pmp->pm_freeclustercount; 929 sbp->f_bresvd = 0; 930 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 931 sbp->f_ffree = 0; /* what to put in here? */ 932 sbp->f_favail = 0; /* what to put in here? */ 933 sbp->f_fresvd = 0; 934 copy_statvfs_info(sbp, mp); 935 return (0); 936 } 937 938 int 939 msdosfs_sync(struct mount *mp, int waitfor, kauth_cred_t cred) 940 { 941 struct vnode *vp, *mvp; 942 struct denode *dep; 943 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 944 int error, allerror = 0; 945 946 /* 947 * If we ever switch to not updating all of the fats all the time, 948 * this would be the place to update them from the first one. 949 */ 950 if (pmp->pm_fmod != 0) { 951 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 952 panic("msdosfs_sync: rofs mod"); 953 else { 954 /* update fats here */ 955 } 956 } 957 /* Allocate a marker vnode. */ 958 mvp = vnalloc(mp); 959 fstrans_start(mp, FSTRANS_SHARED); 960 /* 961 * Write back each (modified) denode. 962 */ 963 mutex_enter(&mntvnode_lock); 964 loop: 965 for (vp = TAILQ_FIRST(&mp->mnt_vnodelist); vp; vp = vunmark(mvp)) { 966 vmark(mvp, vp); 967 if (vp->v_mount != mp || vismarker(vp)) 968 continue; 969 mutex_enter(vp->v_interlock); 970 dep = VTODE(vp); 971 if (waitfor == MNT_LAZY || vp->v_type == VNON || 972 dep == NULL || (((dep->de_flag & 973 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0) && 974 (LIST_EMPTY(&vp->v_dirtyblkhd) && 975 UVM_OBJ_IS_CLEAN(&vp->v_uobj)))) { 976 mutex_exit(vp->v_interlock); 977 continue; 978 } 979 mutex_exit(&mntvnode_lock); 980 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT); 981 if (error) { 982 mutex_enter(&mntvnode_lock); 983 if (error == ENOENT) { 984 (void)vunmark(mvp); 985 goto loop; 986 } 987 continue; 988 } 989 if ((error = VOP_FSYNC(vp, cred, 990 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0)) != 0) 991 allerror = error; 992 vput(vp); 993 mutex_enter(&mntvnode_lock); 994 } 995 mutex_exit(&mntvnode_lock); 996 vnfree(mvp); 997 998 /* 999 * Force stale file system control information to be flushed. 1000 */ 1001 if ((error = VOP_FSYNC(pmp->pm_devvp, cred, 1002 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0)) != 0) 1003 allerror = error; 1004 fstrans_done(mp); 1005 return (allerror); 1006 } 1007 1008 int 1009 msdosfs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) 1010 { 1011 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 1012 struct defid defh; 1013 struct denode *dep; 1014 uint32_t gen; 1015 int error; 1016 1017 if (fhp->fid_len != sizeof(struct defid)) { 1018 DPRINTF(("fid_len %d %zd\n", fhp->fid_len, 1019 sizeof(struct defid))); 1020 return EINVAL; 1021 } 1022 memcpy(&defh, fhp, sizeof(defh)); 1023 error = msdosfs_fh_lookup(pmp, defh.defid_dirclust, defh.defid_dirofs, 1024 &gen); 1025 if (error == 0 && gen != defh.defid_gen) 1026 error = ESTALE; 1027 if (error) { 1028 *vpp = NULLVP; 1029 return error; 1030 } 1031 error = deget(pmp, defh.defid_dirclust, defh.defid_dirofs, &dep); 1032 if (error) { 1033 DPRINTF(("deget %d\n", error)); 1034 *vpp = NULLVP; 1035 return (error); 1036 } 1037 *vpp = DETOV(dep); 1038 return (0); 1039 } 1040 1041 int 1042 msdosfs_vptofh(struct vnode *vp, struct fid *fhp, size_t *fh_size) 1043 { 1044 struct msdosfsmount *pmp = VFSTOMSDOSFS(vp->v_mount); 1045 struct denode *dep; 1046 struct defid defh; 1047 int error; 1048 1049 if (*fh_size < sizeof(struct defid)) { 1050 *fh_size = sizeof(struct defid); 1051 return E2BIG; 1052 } 1053 *fh_size = sizeof(struct defid); 1054 dep = VTODE(vp); 1055 memset(&defh, 0, sizeof(defh)); 1056 defh.defid_len = sizeof(struct defid); 1057 defh.defid_dirclust = dep->de_dirclust; 1058 defh.defid_dirofs = dep->de_diroffset; 1059 error = msdosfs_fh_enter(pmp, dep->de_dirclust, dep->de_diroffset, 1060 &defh.defid_gen); 1061 if (error == 0) 1062 memcpy(fhp, &defh, sizeof(defh)); 1063 return error; 1064 } 1065 1066 int 1067 msdosfs_vget(struct mount *mp, ino_t ino, 1068 struct vnode **vpp) 1069 { 1070 1071 return (EOPNOTSUPP); 1072 } 1073 1074 int 1075 msdosfs_suspendctl(struct mount *mp, int cmd) 1076 { 1077 int error; 1078 struct lwp *l = curlwp; 1079 1080 switch (cmd) { 1081 case SUSPEND_SUSPEND: 1082 if ((error = fstrans_setstate(mp, FSTRANS_SUSPENDING)) != 0) 1083 return error; 1084 error = msdosfs_sync(mp, MNT_WAIT, l->l_proc->p_cred); 1085 if (error == 0) 1086 error = fstrans_setstate(mp, FSTRANS_SUSPENDED); 1087 if (error != 0) { 1088 (void) fstrans_setstate(mp, FSTRANS_NORMAL); 1089 return error; 1090 } 1091 return 0; 1092 1093 case SUSPEND_RESUME: 1094 return fstrans_setstate(mp, FSTRANS_NORMAL); 1095 1096 default: 1097 return EINVAL; 1098 } 1099 } 1100