1 /* $NetBSD: msdosfs_vfsops.c,v 1.79 2010/01/31 10:30:40 mlelstv 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 1.79 2010/01/31 10:30:40 mlelstv 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/ioctl.h> 73 #include <sys/malloc.h> 74 #include <sys/dirent.h> 75 #include <sys/stat.h> 76 #include <sys/conf.h> 77 #include <sys/kauth.h> 78 #include <sys/module.h> 79 80 #include <fs/msdosfs/bpb.h> 81 #include <fs/msdosfs/bootsect.h> 82 #include <fs/msdosfs/direntry.h> 83 #include <fs/msdosfs/denode.h> 84 #include <fs/msdosfs/msdosfsmount.h> 85 #include <fs/msdosfs/fat.h> 86 87 MODULE(MODULE_CLASS_VFS, msdosfs, NULL); 88 89 #ifdef MSDOSFS_DEBUG 90 #define DPRINTF(a) uprintf a 91 #else 92 #define DPRINTF(a) 93 #endif 94 95 #define MSDOSFS_NAMEMAX(pmp) \ 96 (pmp)->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12 97 98 VFS_PROTOS(msdosfs); 99 100 int msdosfs_mountfs(struct vnode *, struct mount *, struct lwp *, 101 struct msdosfs_args *); 102 103 static int update_mp(struct mount *, struct msdosfs_args *); 104 105 MALLOC_JUSTDEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOS FS mount structure"); 106 MALLOC_JUSTDEFINE(M_MSDOSFSFAT, "MSDOSFS fat", "MSDOS FS fat table"); 107 MALLOC_JUSTDEFINE(M_MSDOSFSTMP, "MSDOSFS temp", "MSDOS FS temp. structures"); 108 109 #define ROOTNAME "root_device" 110 111 static struct sysctllog *msdosfs_sysctl_log; 112 113 extern const struct vnodeopv_desc msdosfs_vnodeop_opv_desc; 114 115 const struct vnodeopv_desc * const msdosfs_vnodeopv_descs[] = { 116 &msdosfs_vnodeop_opv_desc, 117 NULL, 118 }; 119 120 struct vfsops msdosfs_vfsops = { 121 MOUNT_MSDOS, 122 sizeof (struct msdosfs_args), 123 msdosfs_mount, 124 msdosfs_start, 125 msdosfs_unmount, 126 msdosfs_root, 127 (void *)eopnotsupp, /* vfs_quotactl */ 128 msdosfs_statvfs, 129 msdosfs_sync, 130 msdosfs_vget, 131 msdosfs_fhtovp, 132 msdosfs_vptofh, 133 msdosfs_init, 134 msdosfs_reinit, 135 msdosfs_done, 136 msdosfs_mountroot, 137 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 138 vfs_stdextattrctl, 139 (void *)eopnotsupp, /* vfs_suspendctl */ 140 genfs_renamelock_enter, 141 genfs_renamelock_exit, 142 (void *)eopnotsupp, 143 msdosfs_vnodeopv_descs, 144 0, 145 { NULL, NULL }, 146 }; 147 148 static int 149 msdosfs_modcmd(modcmd_t cmd, void *arg) 150 { 151 int error; 152 153 switch (cmd) { 154 case MODULE_CMD_INIT: 155 error = vfs_attach(&msdosfs_vfsops); 156 if (error != 0) 157 break; 158 sysctl_createv(&msdosfs_sysctl_log, 0, NULL, NULL, 159 CTLFLAG_PERMANENT, 160 CTLTYPE_NODE, "vfs", NULL, 161 NULL, 0, NULL, 0, 162 CTL_VFS, CTL_EOL); 163 sysctl_createv(&msdosfs_sysctl_log, 0, NULL, NULL, 164 CTLFLAG_PERMANENT, 165 CTLTYPE_NODE, "msdosfs", 166 SYSCTL_DESCR("MS-DOS file system"), 167 NULL, 0, NULL, 0, 168 CTL_VFS, 4, CTL_EOL); 169 /* 170 * XXX the "4" above could be dynamic, thereby eliminating one 171 * more instance of the "number to vfs" mapping problem, but 172 * "4" is the order as taken from sys/mount.h 173 */ 174 break; 175 case MODULE_CMD_FINI: 176 error = vfs_detach(&msdosfs_vfsops); 177 if (error != 0) 178 break; 179 sysctl_teardown(&msdosfs_sysctl_log); 180 break; 181 default: 182 error = ENOTTY; 183 break; 184 } 185 186 return (error); 187 } 188 189 static int 190 update_mp(struct mount *mp, struct msdosfs_args *argp) 191 { 192 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 193 int error; 194 195 pmp->pm_gid = argp->gid; 196 pmp->pm_uid = argp->uid; 197 pmp->pm_mask = argp->mask & ALLPERMS; 198 pmp->pm_dirmask = argp->dirmask & ALLPERMS; 199 pmp->pm_gmtoff = argp->gmtoff; 200 pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT; 201 202 /* 203 * GEMDOS knows nothing about win95 long filenames 204 */ 205 if (pmp->pm_flags & MSDOSFSMNT_GEMDOSFS) 206 pmp->pm_flags |= MSDOSFSMNT_NOWIN95; 207 208 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 209 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 210 else if (!(pmp->pm_flags & 211 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 212 struct vnode *rtvp; 213 214 /* 215 * Try to divine whether to support Win'95 long filenames 216 */ 217 if (FAT32(pmp)) 218 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 219 else { 220 if ((error = msdosfs_root(mp, &rtvp)) != 0) 221 return error; 222 pmp->pm_flags |= findwin95(VTODE(rtvp)) 223 ? MSDOSFSMNT_LONGNAME 224 : MSDOSFSMNT_SHORTNAME; 225 vput(rtvp); 226 } 227 } 228 229 mp->mnt_stat.f_namemax = MSDOSFS_NAMEMAX(pmp); 230 231 return 0; 232 } 233 234 int 235 msdosfs_mountroot(void) 236 { 237 struct mount *mp; 238 struct lwp *l = curlwp; /* XXX */ 239 int error; 240 struct msdosfs_args args; 241 242 if (device_class(root_device) != DV_DISK) 243 return (ENODEV); 244 245 if ((error = vfs_rootmountalloc(MOUNT_MSDOS, "root_device", &mp))) { 246 vrele(rootvp); 247 return (error); 248 } 249 250 args.flags = MSDOSFSMNT_VERSIONED; 251 args.uid = 0; 252 args.gid = 0; 253 args.mask = 0777; 254 args.version = MSDOSFSMNT_VERSION; 255 args.dirmask = 0777; 256 257 if ((error = msdosfs_mountfs(rootvp, mp, l, &args)) != 0) { 258 vfs_unbusy(mp, false, NULL); 259 vfs_destroy(mp); 260 return (error); 261 } 262 263 if ((error = update_mp(mp, &args)) != 0) { 264 (void)msdosfs_unmount(mp, 0); 265 vfs_unbusy(mp, false, NULL); 266 vfs_destroy(mp); 267 vrele(rootvp); 268 return (error); 269 } 270 271 mutex_enter(&mountlist_lock); 272 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 273 mutex_exit(&mountlist_lock); 274 (void)msdosfs_statvfs(mp, &mp->mnt_stat); 275 vfs_unbusy(mp, false, NULL); 276 return (0); 277 } 278 279 /* 280 * mp - path - addr in user space of mount point (ie /usr or whatever) 281 * data - addr in user space of mount params including the name of the block 282 * special file to treat as a filesystem. 283 */ 284 int 285 msdosfs_mount(struct mount *mp, const char *path, void *data, size_t *data_len) 286 { 287 struct lwp *l = curlwp; 288 struct vnode *devvp; /* vnode for blk device to mount */ 289 struct msdosfs_args *args = data; /* holds data from mount request */ 290 /* msdosfs specific mount control block */ 291 struct msdosfsmount *pmp = NULL; 292 int error, flags; 293 mode_t accessmode; 294 295 if (*data_len < sizeof *args) 296 return EINVAL; 297 298 if (mp->mnt_flag & MNT_GETARGS) { 299 pmp = VFSTOMSDOSFS(mp); 300 if (pmp == NULL) 301 return EIO; 302 args->fspec = NULL; 303 args->uid = pmp->pm_uid; 304 args->gid = pmp->pm_gid; 305 args->mask = pmp->pm_mask; 306 args->flags = pmp->pm_flags; 307 args->version = MSDOSFSMNT_VERSION; 308 args->dirmask = pmp->pm_dirmask; 309 args->gmtoff = pmp->pm_gmtoff; 310 *data_len = sizeof *args; 311 return 0; 312 } 313 314 /* 315 * If not versioned (i.e. using old mount_msdos(8)), fill in 316 * the additional structure items with suitable defaults. 317 */ 318 if ((args->flags & MSDOSFSMNT_VERSIONED) == 0) { 319 args->version = 1; 320 args->dirmask = args->mask; 321 } 322 323 /* 324 * Reset GMT offset for pre-v3 mount structure args. 325 */ 326 if (args->version < 3) 327 args->gmtoff = 0; 328 329 /* 330 * If updating, check whether changing from read-only to 331 * read/write; if there is no device name, that's all we do. 332 */ 333 if (mp->mnt_flag & MNT_UPDATE) { 334 pmp = VFSTOMSDOSFS(mp); 335 error = 0; 336 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && 337 (mp->mnt_flag & MNT_RDONLY)) { 338 flags = WRITECLOSE; 339 if (mp->mnt_flag & MNT_FORCE) 340 flags |= FORCECLOSE; 341 error = vflush(mp, NULLVP, flags); 342 } 343 if (!error && (mp->mnt_flag & MNT_RELOAD)) 344 /* not yet implemented */ 345 error = EOPNOTSUPP; 346 if (error) { 347 DPRINTF(("vflush %d\n", error)); 348 return (error); 349 } 350 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && 351 (mp->mnt_iflag & IMNT_WANTRDWR)) { 352 /* 353 * If upgrade to read-write by non-root, then verify 354 * that user has necessary permissions on the device. 355 * 356 * Permission to update a mount is checked higher, so 357 * here we presume updating the mount is okay (for 358 * example, as far as securelevel goes) which leaves us 359 * with the normal check. 360 */ 361 devvp = pmp->pm_devvp; 362 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 363 error = genfs_can_mount(devvp, VREAD | VWRITE, 364 l->l_cred); 365 VOP_UNLOCK(devvp, 0); 366 DPRINTF(("genfs_can_mount %d\n", error)); 367 if (error) 368 return (error); 369 370 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 371 } 372 if (args->fspec == NULL) { 373 DPRINTF(("missing fspec\n")); 374 return EINVAL; 375 } 376 } 377 /* 378 * Not an update, or updating the name: look up the name 379 * and verify that it refers to a sensible block device. 380 */ 381 error = namei_simple_user(args->fspec, 382 NSM_FOLLOW_NOEMULROOT, &devvp); 383 if (error != 0) { 384 DPRINTF(("namei %d\n", error)); 385 return (error); 386 } 387 388 if (devvp->v_type != VBLK) { 389 DPRINTF(("not block\n")); 390 vrele(devvp); 391 return (ENOTBLK); 392 } 393 if (bdevsw_lookup(devvp->v_rdev) == NULL) { 394 DPRINTF(("no block switch\n")); 395 vrele(devvp); 396 return (ENXIO); 397 } 398 /* 399 * If mount by non-root, then verify that user has necessary 400 * permissions on the device. 401 */ 402 accessmode = VREAD; 403 if ((mp->mnt_flag & MNT_RDONLY) == 0) 404 accessmode |= VWRITE; 405 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 406 error = genfs_can_mount(devvp, accessmode, l->l_cred); 407 VOP_UNLOCK(devvp, 0); 408 if (error) { 409 DPRINTF(("genfs_can_mount %d\n", error)); 410 vrele(devvp); 411 return (error); 412 } 413 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 414 int xflags; 415 416 if (mp->mnt_flag & MNT_RDONLY) 417 xflags = FREAD; 418 else 419 xflags = FREAD|FWRITE; 420 error = VOP_OPEN(devvp, xflags, FSCRED); 421 if (error) { 422 DPRINTF(("VOP_OPEN %d\n", error)); 423 goto fail; 424 } 425 error = msdosfs_mountfs(devvp, mp, l, args); 426 if (error) { 427 DPRINTF(("msdosfs_mountfs %d\n", error)); 428 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 429 (void) VOP_CLOSE(devvp, xflags, NOCRED); 430 VOP_UNLOCK(devvp, 0); 431 goto fail; 432 } 433 #ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 434 pmp = VFSTOMSDOSFS(mp); 435 #endif 436 } else { 437 vrele(devvp); 438 if (devvp != pmp->pm_devvp) { 439 DPRINTF(("devvp %p pmp %p\n", 440 devvp, pmp->pm_devvp)); 441 return (EINVAL); /* needs translation */ 442 } 443 } 444 if ((error = update_mp(mp, args)) != 0) { 445 msdosfs_unmount(mp, MNT_FORCE); 446 DPRINTF(("update_mp %d\n", error)); 447 return error; 448 } 449 450 #ifdef MSDOSFS_DEBUG 451 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 452 #endif 453 return set_statvfs_info(path, UIO_USERSPACE, args->fspec, UIO_USERSPACE, 454 mp->mnt_op->vfs_name, mp, l); 455 456 fail: 457 vrele(devvp); 458 return (error); 459 } 460 461 int 462 msdosfs_mountfs(struct vnode *devvp, struct mount *mp, struct lwp *l, struct msdosfs_args *argp) 463 { 464 struct msdosfsmount *pmp; 465 struct buf *bp; 466 dev_t dev = devvp->v_rdev; 467 union bootsector *bsp; 468 struct byte_bpb33 *b33; 469 struct byte_bpb50 *b50; 470 struct byte_bpb710 *b710; 471 uint8_t SecPerClust; 472 int ronly, error, tmp; 473 int bsize; 474 uint64_t psize; 475 unsigned secsize; 476 477 /* Flush out any old buffers remaining from a previous use. */ 478 if ((error = vinvalbuf(devvp, V_SAVE, l->l_cred, l, 0, 0)) != 0) 479 return (error); 480 481 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 482 483 bp = NULL; /* both used in error_exit */ 484 pmp = NULL; 485 486 error = getdisksize(devvp, &psize, &secsize); 487 if (error) 488 goto error_exit; 489 490 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 491 bsize = secsize; 492 if (bsize != 512) { 493 DPRINTF(("Invalid block bsize %d for gemdos\n", bsize)); 494 error = EINVAL; 495 goto error_exit; 496 } 497 } else 498 bsize = 0; 499 500 /* 501 * Read the boot sector of the filesystem, and then check the 502 * boot signature. If not a dos boot sector then error out. 503 */ 504 if ((error = bread(devvp, 0, secsize, NOCRED, 0, &bp)) != 0) 505 goto error_exit; 506 bsp = (union bootsector *)bp->b_data; 507 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 508 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 509 b710 = (struct byte_bpb710 *)bsp->bs710.bsBPB; 510 511 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 512 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 513 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 514 DPRINTF(("bootsig0 %d bootsig1 %d\n", 515 bsp->bs50.bsBootSectSig0, 516 bsp->bs50.bsBootSectSig1)); 517 error = EINVAL; 518 goto error_exit; 519 } 520 } 521 522 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK); 523 memset(pmp, 0, sizeof *pmp); 524 pmp->pm_mountp = mp; 525 526 /* 527 * Compute several useful quantities from the bpb in the 528 * bootsector. Copy in the dos 5 variant of the bpb then fix up 529 * the fields that are different between dos 5 and dos 3.3. 530 */ 531 SecPerClust = b50->bpbSecPerClust; 532 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 533 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 534 pmp->pm_FATs = b50->bpbFATs; 535 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 536 pmp->pm_Sectors = getushort(b50->bpbSectors); 537 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 538 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 539 pmp->pm_Heads = getushort(b50->bpbHeads); 540 pmp->pm_Media = b50->bpbMedia; 541 542 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 543 /* XXX - We should probably check more values here */ 544 if (!pmp->pm_BytesPerSec || !SecPerClust 545 || pmp->pm_SecPerTrack > 63) { 546 DPRINTF(("bytespersec %d secperclust %d " 547 "secpertrack %d\n", 548 pmp->pm_BytesPerSec, SecPerClust, 549 pmp->pm_SecPerTrack)); 550 error = EINVAL; 551 goto error_exit; 552 } 553 } 554 555 if (pmp->pm_Sectors == 0) { 556 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 557 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 558 } else { 559 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 560 pmp->pm_HugeSectors = pmp->pm_Sectors; 561 } 562 563 if (pmp->pm_RootDirEnts == 0) { 564 unsigned short vers = getushort(b710->bpbFSVers); 565 /* 566 * Some say that bsBootSectSig[23] must be zero, but 567 * Windows does not require this and some digital cameras 568 * do not set these to zero. Therefore, do not insist. 569 */ 570 if (pmp->pm_Sectors || pmp->pm_FATsecs || vers) { 571 DPRINTF(("sectors %d fatsecs %lu vers %d\n", 572 pmp->pm_Sectors, pmp->pm_FATsecs, vers)); 573 error = EINVAL; 574 goto error_exit; 575 } 576 pmp->pm_fatmask = FAT32_MASK; 577 pmp->pm_fatmult = 4; 578 pmp->pm_fatdiv = 1; 579 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 580 581 /* mirrorring is enabled if the FATMIRROR bit is not set */ 582 if ((getushort(b710->bpbExtFlags) & FATMIRROR) == 0) 583 pmp->pm_flags |= MSDOSFS_FATMIRROR; 584 else 585 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 586 } else 587 pmp->pm_flags |= MSDOSFS_FATMIRROR; 588 589 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 590 if (FAT32(pmp)) { 591 DPRINTF(("fat32 for gemdos\n")); 592 /* 593 * GEMDOS doesn't know fat32. 594 */ 595 error = EINVAL; 596 goto error_exit; 597 } 598 599 /* 600 * Check a few values (could do some more): 601 * - logical sector size: power of 2, >= block size 602 * - sectors per cluster: power of 2, >= 1 603 * - number of sectors: >= 1, <= size of partition 604 */ 605 if ( (SecPerClust == 0) 606 || (SecPerClust & (SecPerClust - 1)) 607 || (pmp->pm_BytesPerSec < bsize) 608 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 609 || (pmp->pm_HugeSectors == 0) 610 || (pmp->pm_HugeSectors * (pmp->pm_BytesPerSec / bsize) 611 > psize)) { 612 DPRINTF(("consistency checks for gemdos\n")); 613 error = EINVAL; 614 goto error_exit; 615 } 616 /* 617 * XXX - Many parts of the msdos fs driver seem to assume that 618 * the number of bytes per logical sector (BytesPerSec) will 619 * always be the same as the number of bytes per disk block 620 * Let's pretend it is. 621 */ 622 tmp = pmp->pm_BytesPerSec / bsize; 623 pmp->pm_BytesPerSec = bsize; 624 pmp->pm_HugeSectors *= tmp; 625 pmp->pm_HiddenSects *= tmp; 626 pmp->pm_ResSectors *= tmp; 627 pmp->pm_Sectors *= tmp; 628 pmp->pm_FATsecs *= tmp; 629 SecPerClust *= tmp; 630 } 631 632 /* Check that fs has nonzero FAT size */ 633 if (pmp->pm_FATsecs == 0) { 634 DPRINTF(("FATsecs is 0\n")); 635 error = EINVAL; 636 goto error_exit; 637 } 638 639 pmp->pm_fatblk = pmp->pm_ResSectors; 640 if (FAT32(pmp)) { 641 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 642 pmp->pm_firstcluster = pmp->pm_fatblk 643 + (pmp->pm_FATs * pmp->pm_FATsecs); 644 pmp->pm_fsinfo = getushort(b710->bpbFSInfo); 645 } else { 646 pmp->pm_rootdirblk = pmp->pm_fatblk + 647 (pmp->pm_FATs * pmp->pm_FATsecs); 648 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 649 + pmp->pm_BytesPerSec - 1) 650 / pmp->pm_BytesPerSec;/* in sectors */ 651 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 652 } 653 654 pmp->pm_nmbrofclusters = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 655 SecPerClust; 656 pmp->pm_maxcluster = pmp->pm_nmbrofclusters + 1; 657 pmp->pm_fatsize = pmp->pm_FATsecs * pmp->pm_BytesPerSec; 658 659 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 660 if (pmp->pm_nmbrofclusters <= (0xff0 - 2)) { 661 pmp->pm_fatmask = FAT12_MASK; 662 pmp->pm_fatmult = 3; 663 pmp->pm_fatdiv = 2; 664 } else { 665 pmp->pm_fatmask = FAT16_MASK; 666 pmp->pm_fatmult = 2; 667 pmp->pm_fatdiv = 1; 668 } 669 } else if (pmp->pm_fatmask == 0) { 670 if (pmp->pm_maxcluster 671 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 672 /* 673 * This will usually be a floppy disk. This size makes 674 * sure that one fat entry will not be split across 675 * multiple blocks. 676 */ 677 pmp->pm_fatmask = FAT12_MASK; 678 pmp->pm_fatmult = 3; 679 pmp->pm_fatdiv = 2; 680 } else { 681 pmp->pm_fatmask = FAT16_MASK; 682 pmp->pm_fatmult = 2; 683 pmp->pm_fatdiv = 1; 684 } 685 } 686 if (FAT12(pmp)) 687 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 688 else 689 pmp->pm_fatblocksize = MAXBSIZE; 690 691 pmp->pm_fatblocksec = pmp->pm_fatblocksize / pmp->pm_BytesPerSec; 692 pmp->pm_bnshift = ffs(pmp->pm_BytesPerSec) - 1; 693 694 /* 695 * Compute mask and shift value for isolating cluster relative byte 696 * offsets and cluster numbers from a file offset. 697 */ 698 pmp->pm_bpcluster = SecPerClust * pmp->pm_BytesPerSec; 699 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 700 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 701 702 /* 703 * Check for valid cluster size 704 * must be a power of 2 705 */ 706 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 707 DPRINTF(("bpcluster %lu cnshift %lu\n", 708 pmp->pm_bpcluster, pmp->pm_cnshift)); 709 error = EINVAL; 710 goto error_exit; 711 } 712 713 /* 714 * Release the bootsector buffer. 715 */ 716 brelse(bp, BC_AGE); 717 bp = NULL; 718 719 /* 720 * Check FSInfo. 721 */ 722 if (pmp->pm_fsinfo) { 723 struct fsinfo *fp; 724 725 /* 726 * XXX If the fsinfo block is stored on media with 727 * 2KB or larger sectors, is the fsinfo structure 728 * padded at the end or in the middle? 729 */ 730 if ((error = bread(devvp, de_bn2kb(pmp, pmp->pm_fsinfo), 731 pmp->pm_BytesPerSec, NOCRED, 0, &bp)) != 0) 732 goto error_exit; 733 fp = (struct fsinfo *)bp->b_data; 734 if (!memcmp(fp->fsisig1, "RRaA", 4) 735 && !memcmp(fp->fsisig2, "rrAa", 4) 736 && !memcmp(fp->fsisig3, "\0\0\125\252", 4) 737 && !memcmp(fp->fsisig4, "\0\0\125\252", 4)) 738 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 739 else 740 pmp->pm_fsinfo = 0; 741 brelse(bp, 0); 742 bp = NULL; 743 } 744 745 /* 746 * Check and validate (or perhaps invalidate?) the fsinfo structure? 747 * XXX 748 */ 749 if (pmp->pm_fsinfo) { 750 if (pmp->pm_nxtfree == (u_long)-1) 751 pmp->pm_fsinfo = 0; 752 } 753 754 /* 755 * Allocate memory for the bitmap of allocated clusters, and then 756 * fill it in. 757 */ 758 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 759 / N_INUSEBITS) 760 * sizeof(*pmp->pm_inusemap), 761 M_MSDOSFSFAT, M_WAITOK); 762 763 /* 764 * fillinusemap() needs pm_devvp. 765 */ 766 pmp->pm_dev = dev; 767 pmp->pm_devvp = devvp; 768 769 /* 770 * Have the inuse map filled in. 771 */ 772 if ((error = fillinusemap(pmp)) != 0) { 773 DPRINTF(("fillinusemap %d\n", error)); 774 goto error_exit; 775 } 776 777 /* 778 * If they want fat updates to be synchronous then let them suffer 779 * the performance degradation in exchange for the on disk copy of 780 * the fat being correct just about all the time. I suppose this 781 * would be a good thing to turn on if the kernel is still flakey. 782 */ 783 if (mp->mnt_flag & MNT_SYNCHRONOUS) 784 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 785 786 /* 787 * Finish up. 788 */ 789 if (ronly) 790 pmp->pm_flags |= MSDOSFSMNT_RONLY; 791 else 792 pmp->pm_fmod = 1; 793 mp->mnt_data = pmp; 794 mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev; 795 mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_MSDOS); 796 mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; 797 mp->mnt_stat.f_namemax = MSDOSFS_NAMEMAX(pmp); 798 mp->mnt_flag |= MNT_LOCAL; 799 mp->mnt_dev_bshift = pmp->pm_bnshift; 800 mp->mnt_fs_bshift = pmp->pm_cnshift; 801 802 /* 803 * If we ever do quotas for DOS filesystems this would be a place 804 * to fill in the info in the msdosfsmount structure. You dolt, 805 * quotas on dos filesystems make no sense because files have no 806 * owners on dos filesystems. of course there is some empty space 807 * in the directory entry where we could put uid's and gid's. 808 */ 809 810 devvp->v_specmountpoint = mp; 811 812 return (0); 813 814 error_exit:; 815 if (bp) 816 brelse(bp, BC_AGE); 817 if (pmp) { 818 if (pmp->pm_inusemap) 819 free(pmp->pm_inusemap, M_MSDOSFSFAT); 820 free(pmp, M_MSDOSFSMNT); 821 mp->mnt_data = NULL; 822 } 823 return (error); 824 } 825 826 int 827 msdosfs_start(struct mount *mp, int flags) 828 { 829 830 return (0); 831 } 832 833 /* 834 * Unmount the filesystem described by mp. 835 */ 836 int 837 msdosfs_unmount(struct mount *mp, int mntflags) 838 { 839 struct msdosfsmount *pmp; 840 int error, flags; 841 842 flags = 0; 843 if (mntflags & MNT_FORCE) 844 flags |= FORCECLOSE; 845 if ((error = vflush(mp, NULLVP, flags)) != 0) 846 return (error); 847 pmp = VFSTOMSDOSFS(mp); 848 if (pmp->pm_devvp->v_type != VBAD) 849 pmp->pm_devvp->v_specmountpoint = NULL; 850 #ifdef MSDOSFS_DEBUG 851 { 852 struct vnode *vp = pmp->pm_devvp; 853 854 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 855 printf("flag %08x, usecount %d, writecount %d, holdcnt %d\n", 856 vp->v_vflag | vp->v_iflag | vp->v_uflag, vp->v_usecount, 857 vp->v_writecount, vp->v_holdcnt); 858 printf("mount %p, op %p\n", 859 vp->v_mount, vp->v_op); 860 printf("freef %p, freeb %p, mount %p\n", 861 vp->v_freelist.tqe_next, vp->v_freelist.tqe_prev, 862 vp->v_mount); 863 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %d, type %d\n", 864 vp->v_cleanblkhd.lh_first, 865 vp->v_dirtyblkhd.lh_first, 866 vp->v_numoutput, vp->v_type); 867 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 868 vp->v_socket, vp->v_tag, 869 ((u_int *)vp->v_data)[0], 870 ((u_int *)vp->v_data)[1]); 871 } 872 #endif 873 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY); 874 error = VOP_CLOSE(pmp->pm_devvp, 875 pmp->pm_flags & MSDOSFSMNT_RONLY ? FREAD : FREAD|FWRITE, NOCRED); 876 vput(pmp->pm_devvp); 877 free(pmp->pm_inusemap, M_MSDOSFSFAT); 878 free(pmp, M_MSDOSFSMNT); 879 mp->mnt_data = NULL; 880 mp->mnt_flag &= ~MNT_LOCAL; 881 return (error); 882 } 883 884 int 885 msdosfs_root(struct mount *mp, struct vnode **vpp) 886 { 887 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 888 struct denode *ndep; 889 int error; 890 891 #ifdef MSDOSFS_DEBUG 892 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 893 #endif 894 if ((error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep)) != 0) 895 return (error); 896 *vpp = DETOV(ndep); 897 return (0); 898 } 899 900 int 901 msdosfs_statvfs(struct mount *mp, struct statvfs *sbp) 902 { 903 struct msdosfsmount *pmp; 904 905 pmp = VFSTOMSDOSFS(mp); 906 sbp->f_bsize = pmp->pm_bpcluster; 907 sbp->f_frsize = sbp->f_bsize; 908 sbp->f_iosize = pmp->pm_bpcluster; 909 sbp->f_blocks = pmp->pm_nmbrofclusters; 910 sbp->f_bfree = pmp->pm_freeclustercount; 911 sbp->f_bavail = pmp->pm_freeclustercount; 912 sbp->f_bresvd = 0; 913 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 914 sbp->f_ffree = 0; /* what to put in here? */ 915 sbp->f_favail = 0; /* what to put in here? */ 916 sbp->f_fresvd = 0; 917 copy_statvfs_info(sbp, mp); 918 return (0); 919 } 920 921 int 922 msdosfs_sync(struct mount *mp, int waitfor, kauth_cred_t cred) 923 { 924 struct vnode *vp, *mvp; 925 struct denode *dep; 926 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 927 int error, allerror = 0; 928 929 /* 930 * If we ever switch to not updating all of the fats all the time, 931 * this would be the place to update them from the first one. 932 */ 933 if (pmp->pm_fmod != 0) { 934 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 935 panic("msdosfs_sync: rofs mod"); 936 else { 937 /* update fats here */ 938 } 939 } 940 /* Allocate a marker vnode. */ 941 if ((mvp = vnalloc(mp)) == NULL) 942 return ENOMEM; 943 /* 944 * Write back each (modified) denode. 945 */ 946 mutex_enter(&mntvnode_lock); 947 loop: 948 for (vp = TAILQ_FIRST(&mp->mnt_vnodelist); vp; vp = vunmark(mvp)) { 949 vmark(mvp, vp); 950 if (vp->v_mount != mp || vismarker(vp)) 951 continue; 952 mutex_enter(&vp->v_interlock); 953 dep = VTODE(vp); 954 if (waitfor == MNT_LAZY || vp->v_type == VNON || 955 (((dep->de_flag & 956 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0) && 957 (LIST_EMPTY(&vp->v_dirtyblkhd) && 958 UVM_OBJ_IS_CLEAN(&vp->v_uobj)))) { 959 mutex_exit(&vp->v_interlock); 960 continue; 961 } 962 mutex_exit(&mntvnode_lock); 963 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK); 964 if (error) { 965 mutex_enter(&mntvnode_lock); 966 if (error == ENOENT) { 967 (void)vunmark(mvp); 968 goto loop; 969 } 970 continue; 971 } 972 if ((error = VOP_FSYNC(vp, cred, 973 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0)) != 0) 974 allerror = error; 975 vput(vp); 976 mutex_enter(&mntvnode_lock); 977 } 978 mutex_exit(&mntvnode_lock); 979 vnfree(mvp); 980 981 /* 982 * Force stale file system control information to be flushed. 983 */ 984 if ((error = VOP_FSYNC(pmp->pm_devvp, cred, 985 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0)) != 0) 986 allerror = error; 987 return (allerror); 988 } 989 990 int 991 msdosfs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) 992 { 993 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 994 struct defid defh; 995 struct denode *dep; 996 int error; 997 998 if (fhp->fid_len != sizeof(struct defid)) { 999 DPRINTF(("fid_len %d %zd\n", fhp->fid_len, 1000 sizeof(struct defid))); 1001 return EINVAL; 1002 } 1003 1004 memcpy(&defh, fhp, sizeof(defh)); 1005 error = deget(pmp, defh.defid_dirclust, defh.defid_dirofs, &dep); 1006 if (error) { 1007 DPRINTF(("deget %d\n", error)); 1008 *vpp = NULLVP; 1009 return (error); 1010 } 1011 *vpp = DETOV(dep); 1012 return (0); 1013 } 1014 1015 int 1016 msdosfs_vptofh(struct vnode *vp, struct fid *fhp, size_t *fh_size) 1017 { 1018 struct denode *dep; 1019 struct defid defh; 1020 1021 if (*fh_size < sizeof(struct defid)) { 1022 *fh_size = sizeof(struct defid); 1023 return E2BIG; 1024 } 1025 *fh_size = sizeof(struct defid); 1026 dep = VTODE(vp); 1027 memset(&defh, 0, sizeof(defh)); 1028 defh.defid_len = sizeof(struct defid); 1029 defh.defid_dirclust = dep->de_dirclust; 1030 defh.defid_dirofs = dep->de_diroffset; 1031 /* defh.defid_gen = dep->de_gen; */ 1032 memcpy(fhp, &defh, sizeof(defh)); 1033 return (0); 1034 } 1035 1036 int 1037 msdosfs_vget(struct mount *mp, ino_t ino, 1038 struct vnode **vpp) 1039 { 1040 1041 return (EOPNOTSUPP); 1042 } 1043