msdosfs_vfsops.c revision 1.105
1 /* $NetBSD: msdosfs_vfsops.c,v 1.105 2014/03/17 09:35:59 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 (at) 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 (at) 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 1.105 2014/03/17 09:35:59 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, "msdosfs", 162 SYSCTL_DESCR("MS-DOS file system"), 163 NULL, 0, NULL, 0, 164 CTL_VFS, 4, CTL_EOL); 165 /* 166 * XXX the "4" above could be dynamic, thereby eliminating one 167 * more instance of the "number to vfs" mapping problem, but 168 * "4" is the order as taken from sys/mount.h 169 */ 170 break; 171 case MODULE_CMD_FINI: 172 error = vfs_detach(&msdosfs_vfsops); 173 if (error != 0) 174 break; 175 sysctl_teardown(&msdosfs_sysctl_log); 176 break; 177 default: 178 error = ENOTTY; 179 break; 180 } 181 182 return (error); 183 } 184 185 static int 186 update_mp(struct mount *mp, struct msdosfs_args *argp) 187 { 188 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 189 int error; 190 191 pmp->pm_gid = argp->gid; 192 pmp->pm_uid = argp->uid; 193 pmp->pm_mask = argp->mask & ALLPERMS; 194 pmp->pm_dirmask = argp->dirmask & ALLPERMS; 195 pmp->pm_gmtoff = argp->gmtoff; 196 pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT; 197 198 /* 199 * GEMDOS knows nothing about win95 long filenames 200 */ 201 if (pmp->pm_flags & MSDOSFSMNT_GEMDOSFS) 202 pmp->pm_flags |= MSDOSFSMNT_NOWIN95; 203 204 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 205 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 206 else if (!(pmp->pm_flags & 207 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 208 struct vnode *rtvp; 209 210 /* 211 * Try to divine whether to support Win'95 long filenames 212 */ 213 if (FAT32(pmp)) 214 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 215 else { 216 if ((error = msdosfs_root(mp, &rtvp)) != 0) 217 return error; 218 pmp->pm_flags |= findwin95(VTODE(rtvp)) 219 ? MSDOSFSMNT_LONGNAME 220 : MSDOSFSMNT_SHORTNAME; 221 vput(rtvp); 222 } 223 } 224 225 mp->mnt_stat.f_namemax = MSDOSFS_NAMEMAX(pmp); 226 227 return 0; 228 } 229 230 int 231 msdosfs_mountroot(void) 232 { 233 struct mount *mp; 234 struct lwp *l = curlwp; /* XXX */ 235 int error; 236 struct msdosfs_args args; 237 238 if (device_class(root_device) != DV_DISK) 239 return (ENODEV); 240 241 if ((error = vfs_rootmountalloc(MOUNT_MSDOS, "root_device", &mp))) { 242 vrele(rootvp); 243 return (error); 244 } 245 246 args.flags = MSDOSFSMNT_VERSIONED; 247 args.uid = 0; 248 args.gid = 0; 249 args.mask = 0777; 250 args.version = MSDOSFSMNT_VERSION; 251 args.dirmask = 0777; 252 253 if ((error = msdosfs_mountfs(rootvp, mp, l, &args)) != 0) { 254 vfs_unbusy(mp, false, NULL); 255 vfs_destroy(mp); 256 return (error); 257 } 258 259 if ((error = update_mp(mp, &args)) != 0) { 260 (void)msdosfs_unmount(mp, 0); 261 vfs_unbusy(mp, false, NULL); 262 vfs_destroy(mp); 263 vrele(rootvp); 264 return (error); 265 } 266 267 mountlist_append(mp); 268 (void)msdosfs_statvfs(mp, &mp->mnt_stat); 269 vfs_unbusy(mp, false, NULL); 270 return (0); 271 } 272 273 /* 274 * mp - path - addr in user space of mount point (ie /usr or whatever) 275 * data - addr in user space of mount params including the name of the block 276 * special file to treat as a filesystem. 277 */ 278 int 279 msdosfs_mount(struct mount *mp, const char *path, void *data, size_t *data_len) 280 { 281 struct lwp *l = curlwp; 282 struct vnode *devvp; /* vnode for blk device to mount */ 283 struct msdosfs_args *args = data; /* holds data from mount request */ 284 /* msdosfs specific mount control block */ 285 struct msdosfsmount *pmp = NULL; 286 int error, flags; 287 mode_t accessmode; 288 289 if (*data_len < sizeof *args) 290 return EINVAL; 291 292 if (mp->mnt_flag & MNT_GETARGS) { 293 pmp = VFSTOMSDOSFS(mp); 294 if (pmp == NULL) 295 return EIO; 296 args->fspec = NULL; 297 args->uid = pmp->pm_uid; 298 args->gid = pmp->pm_gid; 299 args->mask = pmp->pm_mask; 300 args->flags = pmp->pm_flags; 301 args->version = MSDOSFSMNT_VERSION; 302 args->dirmask = pmp->pm_dirmask; 303 args->gmtoff = pmp->pm_gmtoff; 304 *data_len = sizeof *args; 305 return 0; 306 } 307 308 /* 309 * If not versioned (i.e. using old mount_msdos(8)), fill in 310 * the additional structure items with suitable defaults. 311 */ 312 if ((args->flags & MSDOSFSMNT_VERSIONED) == 0) { 313 args->version = 1; 314 args->dirmask = args->mask; 315 } 316 317 /* 318 * Reset GMT offset for pre-v3 mount structure args. 319 */ 320 if (args->version < 3) 321 args->gmtoff = 0; 322 323 /* 324 * If updating, check whether changing from read-only to 325 * read/write; if there is no device name, that's all we do. 326 */ 327 if (mp->mnt_flag & MNT_UPDATE) { 328 pmp = VFSTOMSDOSFS(mp); 329 error = 0; 330 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && 331 (mp->mnt_flag & MNT_RDONLY)) { 332 flags = WRITECLOSE; 333 if (mp->mnt_flag & MNT_FORCE) 334 flags |= FORCECLOSE; 335 error = vflush(mp, NULLVP, flags); 336 } 337 if (!error && (mp->mnt_flag & MNT_RELOAD)) 338 /* not yet implemented */ 339 error = EOPNOTSUPP; 340 if (error) { 341 DPRINTF(("vflush %d\n", error)); 342 return (error); 343 } 344 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && 345 (mp->mnt_iflag & IMNT_WANTRDWR)) { 346 /* 347 * If upgrade to read-write by non-root, then verify 348 * that user has necessary permissions on the device. 349 * 350 * Permission to update a mount is checked higher, so 351 * here we presume updating the mount is okay (for 352 * example, as far as securelevel goes) which leaves us 353 * with the normal check. 354 */ 355 devvp = pmp->pm_devvp; 356 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 357 error = kauth_authorize_system(l->l_cred, 358 KAUTH_SYSTEM_MOUNT, KAUTH_REQ_SYSTEM_MOUNT_DEVICE, 359 mp, devvp, KAUTH_ARG(VREAD | VWRITE)); 360 VOP_UNLOCK(devvp); 361 DPRINTF(("KAUTH_REQ_SYSTEM_MOUNT_DEVICE %d\n", error)); 362 if (error) 363 return (error); 364 365 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 366 } 367 if (args->fspec == NULL) { 368 DPRINTF(("missing fspec\n")); 369 return EINVAL; 370 } 371 } 372 /* 373 * Not an update, or updating the name: look up the name 374 * and verify that it refers to a sensible block device. 375 */ 376 error = namei_simple_user(args->fspec, 377 NSM_FOLLOW_NOEMULROOT, &devvp); 378 if (error != 0) { 379 DPRINTF(("namei %d\n", error)); 380 return (error); 381 } 382 383 if (devvp->v_type != VBLK) { 384 DPRINTF(("not block\n")); 385 vrele(devvp); 386 return (ENOTBLK); 387 } 388 if (bdevsw_lookup(devvp->v_rdev) == NULL) { 389 DPRINTF(("no block switch\n")); 390 vrele(devvp); 391 return (ENXIO); 392 } 393 /* 394 * If mount by non-root, then verify that user has necessary 395 * permissions on the device. 396 */ 397 accessmode = VREAD; 398 if ((mp->mnt_flag & MNT_RDONLY) == 0) 399 accessmode |= VWRITE; 400 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 401 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT, 402 KAUTH_REQ_SYSTEM_MOUNT_DEVICE, mp, devvp, KAUTH_ARG(accessmode)); 403 VOP_UNLOCK(devvp); 404 if (error) { 405 DPRINTF(("KAUTH_REQ_SYSTEM_MOUNT_DEVICE %d\n", error)); 406 vrele(devvp); 407 return (error); 408 } 409 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 410 int xflags; 411 412 if (mp->mnt_flag & MNT_RDONLY) 413 xflags = FREAD; 414 else 415 xflags = FREAD|FWRITE; 416 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 417 error = VOP_OPEN(devvp, xflags, FSCRED); 418 VOP_UNLOCK(devvp); 419 if (error) { 420 DPRINTF(("VOP_OPEN %d\n", error)); 421 goto fail; 422 } 423 error = msdosfs_mountfs(devvp, mp, l, args); 424 if (error) { 425 DPRINTF(("msdosfs_mountfs %d\n", error)); 426 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 427 (void) VOP_CLOSE(devvp, xflags, NOCRED); 428 VOP_UNLOCK(devvp); 429 goto fail; 430 } 431 #ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 432 pmp = VFSTOMSDOSFS(mp); 433 #endif 434 } else { 435 vrele(devvp); 436 if (devvp != pmp->pm_devvp) { 437 DPRINTF(("devvp %p pmp %p\n", 438 devvp, pmp->pm_devvp)); 439 return (EINVAL); /* needs translation */ 440 } 441 } 442 if ((error = update_mp(mp, args)) != 0) { 443 msdosfs_unmount(mp, MNT_FORCE); 444 DPRINTF(("update_mp %d\n", error)); 445 return error; 446 } 447 448 #ifdef MSDOSFS_DEBUG 449 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 450 #endif 451 return set_statvfs_info(path, UIO_USERSPACE, args->fspec, UIO_USERSPACE, 452 mp->mnt_op->vfs_name, mp, l); 453 454 fail: 455 vrele(devvp); 456 return (error); 457 } 458 459 int 460 msdosfs_mountfs(struct vnode *devvp, struct mount *mp, struct lwp *l, struct msdosfs_args *argp) 461 { 462 struct msdosfsmount *pmp; 463 struct buf *bp; 464 dev_t dev = devvp->v_rdev; 465 union bootsector *bsp; 466 struct byte_bpb33 *b33; 467 struct byte_bpb50 *b50; 468 struct byte_bpb710 *b710; 469 uint8_t SecPerClust; 470 int ronly, error, tmp; 471 int bsize; 472 uint64_t psize; 473 unsigned secsize; 474 475 /* Flush out any old buffers remaining from a previous use. */ 476 if ((error = vinvalbuf(devvp, V_SAVE, l->l_cred, l, 0, 0)) != 0) 477 return (error); 478 479 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 480 481 bp = NULL; /* both used in error_exit */ 482 pmp = NULL; 483 484 error = fstrans_mount(mp); 485 if (error) 486 goto error_exit; 487 488 error = getdisksize(devvp, &psize, &secsize); 489 if (error) { 490 if (argp->flags & MSDOSFSMNT_GEMDOSFS) 491 goto error_exit; 492 493 /* ok, so it failed. we most likely don't need the info */ 494 secsize = DEV_BSIZE; 495 psize = 0; 496 error = 0; 497 } 498 499 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 500 bsize = secsize; 501 if (bsize != 512) { 502 DPRINTF(("Invalid block bsize %d for GEMDOS\n", bsize)); 503 error = EINVAL; 504 goto error_exit; 505 } 506 } else 507 bsize = 0; 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\n", 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); 532 memset(pmp, 0, sizeof *pmp); 533 pmp->pm_mountp = mp; 534 535 /* 536 * Compute several useful quantities from the bpb in the 537 * bootsector. Copy in the dos 5 variant of the bpb then fix up 538 * the fields that are different between dos 5 and dos 3.3. 539 */ 540 SecPerClust = b50->bpbSecPerClust; 541 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 542 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 543 pmp->pm_FATs = b50->bpbFATs; 544 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 545 pmp->pm_Sectors = getushort(b50->bpbSectors); 546 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 547 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 548 pmp->pm_Heads = getushort(b50->bpbHeads); 549 pmp->pm_Media = b50->bpbMedia; 550 551 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 552 /* XXX - We should probably check more values here */ 553 if (!pmp->pm_BytesPerSec || !SecPerClust 554 || pmp->pm_SecPerTrack > 63) { 555 DPRINTF(("bytespersec %d secperclust %d " 556 "secpertrack %d\n", 557 pmp->pm_BytesPerSec, SecPerClust, 558 pmp->pm_SecPerTrack)); 559 error = EINVAL; 560 goto error_exit; 561 } 562 } 563 564 if (pmp->pm_Sectors == 0) { 565 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 566 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 567 } else { 568 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 569 pmp->pm_HugeSectors = pmp->pm_Sectors; 570 } 571 572 if (pmp->pm_RootDirEnts == 0) { 573 unsigned short vers = getushort(b710->bpbFSVers); 574 /* 575 * Some say that bsBootSectSig[23] must be zero, but 576 * Windows does not require this and some digital cameras 577 * do not set these to zero. Therefore, do not insist. 578 */ 579 if (pmp->pm_Sectors || pmp->pm_FATsecs || vers) { 580 DPRINTF(("sectors %d fatsecs %lu vers %d\n", 581 pmp->pm_Sectors, pmp->pm_FATsecs, vers)); 582 error = EINVAL; 583 goto error_exit; 584 } 585 pmp->pm_fatmask = FAT32_MASK; 586 pmp->pm_fatmult = 4; 587 pmp->pm_fatdiv = 1; 588 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 589 590 /* mirrorring is enabled if the FATMIRROR bit is not set */ 591 if ((getushort(b710->bpbExtFlags) & FATMIRROR) == 0) 592 pmp->pm_flags |= MSDOSFS_FATMIRROR; 593 else 594 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 595 } else 596 pmp->pm_flags |= MSDOSFS_FATMIRROR; 597 598 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 599 if (FAT32(pmp)) { 600 DPRINTF(("FAT32 for GEMDOS\n")); 601 /* 602 * GEMDOS doesn't know FAT32. 603 */ 604 error = EINVAL; 605 goto error_exit; 606 } 607 608 /* 609 * Check a few values (could do some more): 610 * - logical sector size: power of 2, >= block size 611 * - sectors per cluster: power of 2, >= 1 612 * - number of sectors: >= 1, <= size of partition 613 */ 614 if ( (SecPerClust == 0) 615 || (SecPerClust & (SecPerClust - 1)) 616 || (pmp->pm_BytesPerSec < bsize) 617 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 618 || (pmp->pm_HugeSectors == 0) 619 || (pmp->pm_HugeSectors * (pmp->pm_BytesPerSec / bsize) 620 > psize)) { 621 DPRINTF(("consistency checks for GEMDOS\n")); 622 error = EINVAL; 623 goto error_exit; 624 } 625 /* 626 * XXX - Many parts of the msdosfs driver seem to assume that 627 * the number of bytes per logical sector (BytesPerSec) will 628 * always be the same as the number of bytes per disk block 629 * Let's pretend it is. 630 */ 631 tmp = pmp->pm_BytesPerSec / bsize; 632 pmp->pm_BytesPerSec = bsize; 633 pmp->pm_HugeSectors *= tmp; 634 pmp->pm_HiddenSects *= tmp; 635 pmp->pm_ResSectors *= tmp; 636 pmp->pm_Sectors *= tmp; 637 pmp->pm_FATsecs *= tmp; 638 SecPerClust *= tmp; 639 } 640 641 /* Check that fs has nonzero FAT size */ 642 if (pmp->pm_FATsecs == 0) { 643 DPRINTF(("FATsecs is 0\n")); 644 error = EINVAL; 645 goto error_exit; 646 } 647 648 pmp->pm_fatblk = pmp->pm_ResSectors; 649 if (FAT32(pmp)) { 650 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 651 pmp->pm_firstcluster = pmp->pm_fatblk 652 + (pmp->pm_FATs * pmp->pm_FATsecs); 653 pmp->pm_fsinfo = getushort(b710->bpbFSInfo); 654 } else { 655 pmp->pm_rootdirblk = pmp->pm_fatblk + 656 (pmp->pm_FATs * pmp->pm_FATsecs); 657 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 658 + pmp->pm_BytesPerSec - 1) 659 / pmp->pm_BytesPerSec;/* in sectors */ 660 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 661 } 662 663 pmp->pm_nmbrofclusters = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 664 SecPerClust; 665 pmp->pm_maxcluster = pmp->pm_nmbrofclusters + 1; 666 pmp->pm_fatsize = pmp->pm_FATsecs * pmp->pm_BytesPerSec; 667 668 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 669 if (pmp->pm_nmbrofclusters <= (0xff0 - 2)) { 670 pmp->pm_fatmask = FAT12_MASK; 671 pmp->pm_fatmult = 3; 672 pmp->pm_fatdiv = 2; 673 } else { 674 pmp->pm_fatmask = FAT16_MASK; 675 pmp->pm_fatmult = 2; 676 pmp->pm_fatdiv = 1; 677 } 678 } else if (pmp->pm_fatmask == 0) { 679 if (pmp->pm_maxcluster 680 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 681 /* 682 * This will usually be a floppy disk. This size makes 683 * sure that one FAT entry will not be split across 684 * multiple blocks. 685 */ 686 pmp->pm_fatmask = FAT12_MASK; 687 pmp->pm_fatmult = 3; 688 pmp->pm_fatdiv = 2; 689 } else { 690 pmp->pm_fatmask = FAT16_MASK; 691 pmp->pm_fatmult = 2; 692 pmp->pm_fatdiv = 1; 693 } 694 } 695 if (FAT12(pmp)) 696 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 697 else 698 pmp->pm_fatblocksize = MAXBSIZE; 699 700 pmp->pm_fatblocksec = pmp->pm_fatblocksize / pmp->pm_BytesPerSec; 701 pmp->pm_bnshift = ffs(pmp->pm_BytesPerSec) - 1; 702 703 /* 704 * Compute mask and shift value for isolating cluster relative byte 705 * offsets and cluster numbers from a file offset. 706 */ 707 pmp->pm_bpcluster = SecPerClust * pmp->pm_BytesPerSec; 708 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 709 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 710 711 /* 712 * Check for valid cluster size 713 * must be a power of 2 714 */ 715 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 716 DPRINTF(("bpcluster %lu cnshift %lu\n", 717 pmp->pm_bpcluster, pmp->pm_cnshift)); 718 error = EINVAL; 719 goto error_exit; 720 } 721 722 /* 723 * Cluster size must be within limit of MAXBSIZE. 724 * Many FAT filesystems will not have clusters larger than 725 * 32KiB due to limits in Windows versions before Vista. 726 */ 727 if (pmp->pm_bpcluster > MAXBSIZE) { 728 DPRINTF(("bpcluster %lu > MAXBSIZE %d\n", 729 pmp->pm_bpcluster, MAXBSIZE)); 730 error = EINVAL; 731 goto error_exit; 732 } 733 734 /* 735 * Release the bootsector buffer. 736 */ 737 brelse(bp, BC_AGE); 738 bp = NULL; 739 740 /* 741 * Check FSInfo. 742 */ 743 if (pmp->pm_fsinfo) { 744 struct fsinfo *fp; 745 746 /* 747 * XXX If the fsinfo block is stored on media with 748 * 2KB or larger sectors, is the fsinfo structure 749 * padded at the end or in the middle? 750 */ 751 if ((error = bread(devvp, de_bn2kb(pmp, pmp->pm_fsinfo), 752 pmp->pm_BytesPerSec, NOCRED, 0, &bp)) != 0) 753 goto error_exit; 754 fp = (struct fsinfo *)bp->b_data; 755 if (!memcmp(fp->fsisig1, "RRaA", 4) 756 && !memcmp(fp->fsisig2, "rrAa", 4) 757 && !memcmp(fp->fsisig3, "\0\0\125\252", 4) 758 && !memcmp(fp->fsisig4, "\0\0\125\252", 4)) 759 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 760 else 761 pmp->pm_fsinfo = 0; 762 brelse(bp, 0); 763 bp = NULL; 764 } 765 766 /* 767 * Check and validate (or perhaps invalidate?) the fsinfo structure? 768 * XXX 769 */ 770 if (pmp->pm_fsinfo) { 771 if ((pmp->pm_nxtfree == 0xffffffffUL) || 772 (pmp->pm_nxtfree > pmp->pm_maxcluster)) 773 pmp->pm_fsinfo = 0; 774 } 775 776 /* 777 * Allocate memory for the bitmap of allocated clusters, and then 778 * fill it in. 779 */ 780 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS) 781 / N_INUSEBITS) 782 * sizeof(*pmp->pm_inusemap), 783 M_MSDOSFSFAT, M_WAITOK); 784 785 /* 786 * fillinusemap() needs pm_devvp. 787 */ 788 pmp->pm_dev = dev; 789 pmp->pm_devvp = devvp; 790 791 /* 792 * Have the inuse map filled in. 793 */ 794 if ((error = fillinusemap(pmp)) != 0) { 795 DPRINTF(("fillinusemap %d\n", error)); 796 goto error_exit; 797 } 798 799 /* 800 * If they want FAT updates to be synchronous then let them suffer 801 * the performance degradation in exchange for the on disk copy of 802 * the FAT being correct just about all the time. I suppose this 803 * would be a good thing to turn on if the kernel is still flakey. 804 */ 805 if (mp->mnt_flag & MNT_SYNCHRONOUS) 806 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 807 808 /* 809 * Finish up. 810 */ 811 if (ronly) 812 pmp->pm_flags |= MSDOSFSMNT_RONLY; 813 else 814 pmp->pm_fmod = 1; 815 mp->mnt_data = pmp; 816 mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev; 817 mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_MSDOS); 818 mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; 819 mp->mnt_stat.f_namemax = MSDOSFS_NAMEMAX(pmp); 820 mp->mnt_flag |= MNT_LOCAL; 821 mp->mnt_dev_bshift = pmp->pm_bnshift; 822 mp->mnt_fs_bshift = pmp->pm_cnshift; 823 824 /* 825 * If we ever do quotas for DOS filesystems this would be a place 826 * to fill in the info in the msdosfsmount structure. You dolt, 827 * quotas on dos filesystems make no sense because files have no 828 * owners on dos filesystems. of course there is some empty space 829 * in the directory entry where we could put uid's and gid's. 830 */ 831 832 spec_node_setmountedfs(devvp, mp); 833 834 return (0); 835 836 error_exit: 837 fstrans_unmount(mp); 838 if (bp) 839 brelse(bp, BC_AGE); 840 if (pmp) { 841 if (pmp->pm_inusemap) 842 free(pmp->pm_inusemap, M_MSDOSFSFAT); 843 free(pmp, M_MSDOSFSMNT); 844 mp->mnt_data = NULL; 845 } 846 return (error); 847 } 848 849 int 850 msdosfs_start(struct mount *mp, int flags) 851 { 852 853 return (0); 854 } 855 856 /* 857 * Unmount the filesystem described by mp. 858 */ 859 int 860 msdosfs_unmount(struct mount *mp, int mntflags) 861 { 862 struct msdosfsmount *pmp; 863 int error, flags; 864 865 flags = 0; 866 if (mntflags & MNT_FORCE) 867 flags |= FORCECLOSE; 868 if ((error = vflush(mp, NULLVP, flags)) != 0) 869 return (error); 870 pmp = VFSTOMSDOSFS(mp); 871 if (pmp->pm_devvp->v_type != VBAD) 872 spec_node_setmountedfs(pmp->pm_devvp, NULL); 873 #ifdef MSDOSFS_DEBUG 874 { 875 struct vnode *vp = pmp->pm_devvp; 876 877 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 878 printf("flag %08x, usecount %d, writecount %d, holdcnt %d\n", 879 vp->v_vflag | vp->v_iflag | vp->v_uflag, vp->v_usecount, 880 vp->v_writecount, vp->v_holdcnt); 881 printf("mount %p, op %p\n", 882 vp->v_mount, vp->v_op); 883 printf("freef %p, freeb %p, mount %p\n", 884 vp->v_freelist.tqe_next, vp->v_freelist.tqe_prev, 885 vp->v_mount); 886 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %d, type %d\n", 887 vp->v_cleanblkhd.lh_first, 888 vp->v_dirtyblkhd.lh_first, 889 vp->v_numoutput, vp->v_type); 890 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 891 vp->v_socket, vp->v_tag, 892 ((u_int *)vp->v_data)[0], 893 ((u_int *)vp->v_data)[1]); 894 } 895 #endif 896 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY); 897 (void) VOP_CLOSE(pmp->pm_devvp, 898 pmp->pm_flags & MSDOSFSMNT_RONLY ? FREAD : FREAD|FWRITE, NOCRED); 899 vput(pmp->pm_devvp); 900 msdosfs_fh_destroy(pmp); 901 free(pmp->pm_inusemap, M_MSDOSFSFAT); 902 free(pmp, M_MSDOSFSMNT); 903 mp->mnt_data = NULL; 904 mp->mnt_flag &= ~MNT_LOCAL; 905 fstrans_unmount(mp); 906 return (0); 907 } 908 909 int 910 msdosfs_root(struct mount *mp, struct vnode **vpp) 911 { 912 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 913 struct denode *ndep; 914 int error; 915 916 #ifdef MSDOSFS_DEBUG 917 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 918 #endif 919 if ((error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep)) != 0) 920 return (error); 921 *vpp = DETOV(ndep); 922 return (0); 923 } 924 925 int 926 msdosfs_statvfs(struct mount *mp, struct statvfs *sbp) 927 { 928 struct msdosfsmount *pmp; 929 930 pmp = VFSTOMSDOSFS(mp); 931 sbp->f_bsize = pmp->pm_bpcluster; 932 sbp->f_frsize = sbp->f_bsize; 933 sbp->f_iosize = pmp->pm_bpcluster; 934 sbp->f_blocks = pmp->pm_nmbrofclusters; 935 sbp->f_bfree = pmp->pm_freeclustercount; 936 sbp->f_bavail = pmp->pm_freeclustercount; 937 sbp->f_bresvd = 0; 938 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 939 sbp->f_ffree = 0; /* what to put in here? */ 940 sbp->f_favail = 0; /* what to put in here? */ 941 sbp->f_fresvd = 0; 942 copy_statvfs_info(sbp, mp); 943 return (0); 944 } 945 946 int 947 msdosfs_sync(struct mount *mp, int waitfor, kauth_cred_t cred) 948 { 949 struct vnode *vp; 950 struct vnode_iterator *marker; 951 struct denode *dep; 952 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 953 int error, allerror = 0; 954 955 /* 956 * If we ever switch to not updating all of the FATs all the time, 957 * this would be the place to update them from the first one. 958 */ 959 if (pmp->pm_fmod != 0) { 960 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 961 panic("msdosfs_sync: rofs mod"); 962 else { 963 /* update FATs here */ 964 } 965 } 966 fstrans_start(mp, FSTRANS_SHARED); 967 /* 968 * Write back each (modified) denode. 969 */ 970 vfs_vnode_iterator_init(mp, &marker); 971 while (vfs_vnode_iterator_next(marker, &vp)) { 972 error = vn_lock(vp, LK_EXCLUSIVE); 973 if (error) { 974 vrele(vp); 975 continue; 976 } 977 dep = VTODE(vp); 978 if (waitfor == MNT_LAZY || vp->v_type == VNON || 979 dep == NULL || (((dep->de_flag & 980 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0) && 981 (LIST_EMPTY(&vp->v_dirtyblkhd) && 982 UVM_OBJ_IS_CLEAN(&vp->v_uobj)))) { 983 vput(vp); 984 continue; 985 } 986 if ((error = VOP_FSYNC(vp, cred, 987 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0)) != 0) 988 allerror = error; 989 vput(vp); 990 } 991 vfs_vnode_iterator_destroy(marker); 992 993 /* 994 * Force stale file system control information to be flushed. 995 */ 996 if ((error = VOP_FSYNC(pmp->pm_devvp, cred, 997 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0)) != 0) 998 allerror = error; 999 fstrans_done(mp); 1000 return (allerror); 1001 } 1002 1003 int 1004 msdosfs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) 1005 { 1006 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 1007 struct defid defh; 1008 struct denode *dep; 1009 uint32_t gen; 1010 int error; 1011 1012 if (fhp->fid_len != sizeof(struct defid)) { 1013 DPRINTF(("fid_len %d %zd\n", fhp->fid_len, 1014 sizeof(struct defid))); 1015 return EINVAL; 1016 } 1017 memcpy(&defh, fhp, sizeof(defh)); 1018 error = msdosfs_fh_lookup(pmp, defh.defid_dirclust, defh.defid_dirofs, 1019 &gen); 1020 if (error == 0 && gen != defh.defid_gen) 1021 error = ESTALE; 1022 if (error) { 1023 *vpp = NULLVP; 1024 return error; 1025 } 1026 error = deget(pmp, defh.defid_dirclust, defh.defid_dirofs, &dep); 1027 if (error) { 1028 DPRINTF(("deget %d\n", error)); 1029 *vpp = NULLVP; 1030 return (error); 1031 } 1032 *vpp = DETOV(dep); 1033 return (0); 1034 } 1035 1036 int 1037 msdosfs_vptofh(struct vnode *vp, struct fid *fhp, size_t *fh_size) 1038 { 1039 struct msdosfsmount *pmp = VFSTOMSDOSFS(vp->v_mount); 1040 struct denode *dep; 1041 struct defid defh; 1042 int error; 1043 1044 if (*fh_size < sizeof(struct defid)) { 1045 *fh_size = sizeof(struct defid); 1046 return E2BIG; 1047 } 1048 *fh_size = sizeof(struct defid); 1049 dep = VTODE(vp); 1050 memset(&defh, 0, sizeof(defh)); 1051 defh.defid_len = sizeof(struct defid); 1052 defh.defid_dirclust = dep->de_dirclust; 1053 defh.defid_dirofs = dep->de_diroffset; 1054 error = msdosfs_fh_enter(pmp, dep->de_dirclust, dep->de_diroffset, 1055 &defh.defid_gen); 1056 if (error == 0) 1057 memcpy(fhp, &defh, sizeof(defh)); 1058 return error; 1059 } 1060 1061 int 1062 msdosfs_vget(struct mount *mp, ino_t ino, 1063 struct vnode **vpp) 1064 { 1065 1066 return (EOPNOTSUPP); 1067 } 1068 1069 int 1070 msdosfs_suspendctl(struct mount *mp, int cmd) 1071 { 1072 int error; 1073 struct lwp *l = curlwp; 1074 1075 switch (cmd) { 1076 case SUSPEND_SUSPEND: 1077 if ((error = fstrans_setstate(mp, FSTRANS_SUSPENDING)) != 0) 1078 return error; 1079 error = msdosfs_sync(mp, MNT_WAIT, l->l_proc->p_cred); 1080 if (error == 0) 1081 error = fstrans_setstate(mp, FSTRANS_SUSPENDED); 1082 if (error != 0) { 1083 (void) fstrans_setstate(mp, FSTRANS_NORMAL); 1084 return error; 1085 } 1086 return 0; 1087 1088 case SUSPEND_RESUME: 1089 return fstrans_setstate(mp, FSTRANS_NORMAL); 1090 1091 default: 1092 return EINVAL; 1093 } 1094 } 1095
Indexes created Sat Sep 27 22:09:54 GMT 2025