1 /* $NetBSD: msdosfs_vfsops.c,v 1.94 2012/03/13 18:40:37 elad 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 1.94 2012/03/13 18:40:37 elad 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 = kauth_authorize_system(l->l_cred, 365 KAUTH_SYSTEM_MOUNT, KAUTH_REQ_SYSTEM_MOUNT_DEVICE, 366 mp, devvp, KAUTH_ARG(VREAD | VWRITE)); 367 VOP_UNLOCK(devvp); 368 DPRINTF(("KAUTH_REQ_SYSTEM_MOUNT_DEVICE %d\n", error)); 369 if (error) 370 return (error); 371 372 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 373 } 374 if (args->fspec == NULL) { 375 DPRINTF(("missing fspec\n")); 376 return EINVAL; 377 } 378 } 379 /* 380 * Not an update, or updating the name: look up the name 381 * and verify that it refers to a sensible block device. 382 */ 383 error = namei_simple_user(args->fspec, 384 NSM_FOLLOW_NOEMULROOT, &devvp); 385 if (error != 0) { 386 DPRINTF(("namei %d\n", error)); 387 return (error); 388 } 389 390 if (devvp->v_type != VBLK) { 391 DPRINTF(("not block\n")); 392 vrele(devvp); 393 return (ENOTBLK); 394 } 395 if (bdevsw_lookup(devvp->v_rdev) == NULL) { 396 DPRINTF(("no block switch\n")); 397 vrele(devvp); 398 return (ENXIO); 399 } 400 /* 401 * If mount by non-root, then verify that user has necessary 402 * permissions on the device. 403 */ 404 accessmode = VREAD; 405 if ((mp->mnt_flag & MNT_RDONLY) == 0) 406 accessmode |= VWRITE; 407 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 408 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT, 409 KAUTH_REQ_SYSTEM_MOUNT_DEVICE, mp, devvp, KAUTH_ARG(accessmode)); 410 VOP_UNLOCK(devvp); 411 if (error) { 412 DPRINTF(("KAUTH_REQ_SYSTEM_MOUNT_DEVICE %d\n", error)); 413 vrele(devvp); 414 return (error); 415 } 416 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 417 int xflags; 418 419 if (mp->mnt_flag & MNT_RDONLY) 420 xflags = FREAD; 421 else 422 xflags = FREAD|FWRITE; 423 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 424 error = VOP_OPEN(devvp, xflags, FSCRED); 425 VOP_UNLOCK(devvp); 426 if (error) { 427 DPRINTF(("VOP_OPEN %d\n", error)); 428 goto fail; 429 } 430 error = msdosfs_mountfs(devvp, mp, l, args); 431 if (error) { 432 DPRINTF(("msdosfs_mountfs %d\n", error)); 433 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 434 (void) VOP_CLOSE(devvp, xflags, NOCRED); 435 VOP_UNLOCK(devvp); 436 goto fail; 437 } 438 #ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 439 pmp = VFSTOMSDOSFS(mp); 440 #endif 441 } else { 442 vrele(devvp); 443 if (devvp != pmp->pm_devvp) { 444 DPRINTF(("devvp %p pmp %p\n", 445 devvp, pmp->pm_devvp)); 446 return (EINVAL); /* needs translation */ 447 } 448 } 449 if ((error = update_mp(mp, args)) != 0) { 450 msdosfs_unmount(mp, MNT_FORCE); 451 DPRINTF(("update_mp %d\n", error)); 452 return error; 453 } 454 455 #ifdef MSDOSFS_DEBUG 456 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 457 #endif 458 return set_statvfs_info(path, UIO_USERSPACE, args->fspec, UIO_USERSPACE, 459 mp->mnt_op->vfs_name, mp, l); 460 461 fail: 462 vrele(devvp); 463 return (error); 464 } 465 466 int 467 msdosfs_mountfs(struct vnode *devvp, struct mount *mp, struct lwp *l, struct msdosfs_args *argp) 468 { 469 struct msdosfsmount *pmp; 470 struct buf *bp; 471 dev_t dev = devvp->v_rdev; 472 union bootsector *bsp; 473 struct byte_bpb33 *b33; 474 struct byte_bpb50 *b50; 475 struct byte_bpb710 *b710; 476 uint8_t SecPerClust; 477 int ronly, error, tmp; 478 int bsize; 479 uint64_t psize; 480 unsigned secsize; 481 482 /* Flush out any old buffers remaining from a previous use. */ 483 if ((error = vinvalbuf(devvp, V_SAVE, l->l_cred, l, 0, 0)) != 0) 484 return (error); 485 486 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 487 488 bp = NULL; /* both used in error_exit */ 489 pmp = NULL; 490 491 error = fstrans_mount(mp); 492 if (error) 493 goto error_exit; 494 495 error = getdisksize(devvp, &psize, &secsize); 496 if (error) { 497 if (argp->flags & MSDOSFSMNT_GEMDOSFS) 498 goto error_exit; 499 500 /* ok, so it failed. we most likely don't need the info */ 501 secsize = DEV_BSIZE; 502 psize = 0; 503 error = 0; 504 } 505 506 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 507 bsize = secsize; 508 if (bsize != 512) { 509 DPRINTF(("Invalid block bsize %d for gemdos\n", bsize)); 510 error = EINVAL; 511 goto error_exit; 512 } 513 } else 514 bsize = 0; 515 516 /* 517 * Read the boot sector of the filesystem, and then check the 518 * boot signature. If not a dos boot sector then error out. 519 */ 520 if ((error = bread(devvp, 0, secsize, NOCRED, 0, &bp)) != 0) 521 goto error_exit; 522 bsp = (union bootsector *)bp->b_data; 523 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 524 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 525 b710 = (struct byte_bpb710 *)bsp->bs710.bsBPB; 526 527 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 528 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 529 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 530 DPRINTF(("bootsig0 %d bootsig1 %d\n", 531 bsp->bs50.bsBootSectSig0, 532 bsp->bs50.bsBootSectSig1)); 533 error = EINVAL; 534 goto error_exit; 535 } 536 } 537 538 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK); 539 memset(pmp, 0, sizeof *pmp); 540 pmp->pm_mountp = mp; 541 542 /* 543 * Compute several useful quantities from the bpb in the 544 * bootsector. Copy in the dos 5 variant of the bpb then fix up 545 * the fields that are different between dos 5 and dos 3.3. 546 */ 547 SecPerClust = b50->bpbSecPerClust; 548 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 549 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 550 pmp->pm_FATs = b50->bpbFATs; 551 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 552 pmp->pm_Sectors = getushort(b50->bpbSectors); 553 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 554 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 555 pmp->pm_Heads = getushort(b50->bpbHeads); 556 pmp->pm_Media = b50->bpbMedia; 557 558 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 559 /* XXX - We should probably check more values here */ 560 if (!pmp->pm_BytesPerSec || !SecPerClust 561 || pmp->pm_SecPerTrack > 63) { 562 DPRINTF(("bytespersec %d secperclust %d " 563 "secpertrack %d\n", 564 pmp->pm_BytesPerSec, SecPerClust, 565 pmp->pm_SecPerTrack)); 566 error = EINVAL; 567 goto error_exit; 568 } 569 } 570 571 if (pmp->pm_Sectors == 0) { 572 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 573 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 574 } else { 575 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 576 pmp->pm_HugeSectors = pmp->pm_Sectors; 577 } 578 579 if (pmp->pm_RootDirEnts == 0) { 580 unsigned short vers = getushort(b710->bpbFSVers); 581 /* 582 * Some say that bsBootSectSig[23] must be zero, but 583 * Windows does not require this and some digital cameras 584 * do not set these to zero. Therefore, do not insist. 585 */ 586 if (pmp->pm_Sectors || pmp->pm_FATsecs || vers) { 587 DPRINTF(("sectors %d fatsecs %lu vers %d\n", 588 pmp->pm_Sectors, pmp->pm_FATsecs, vers)); 589 error = EINVAL; 590 goto error_exit; 591 } 592 pmp->pm_fatmask = FAT32_MASK; 593 pmp->pm_fatmult = 4; 594 pmp->pm_fatdiv = 1; 595 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 596 597 /* mirrorring is enabled if the FATMIRROR bit is not set */ 598 if ((getushort(b710->bpbExtFlags) & FATMIRROR) == 0) 599 pmp->pm_flags |= MSDOSFS_FATMIRROR; 600 else 601 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 602 } else 603 pmp->pm_flags |= MSDOSFS_FATMIRROR; 604 605 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 606 if (FAT32(pmp)) { 607 DPRINTF(("fat32 for gemdos\n")); 608 /* 609 * GEMDOS doesn't know fat32. 610 */ 611 error = EINVAL; 612 goto error_exit; 613 } 614 615 /* 616 * Check a few values (could do some more): 617 * - logical sector size: power of 2, >= block size 618 * - sectors per cluster: power of 2, >= 1 619 * - number of sectors: >= 1, <= size of partition 620 */ 621 if ( (SecPerClust == 0) 622 || (SecPerClust & (SecPerClust - 1)) 623 || (pmp->pm_BytesPerSec < bsize) 624 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 625 || (pmp->pm_HugeSectors == 0) 626 || (pmp->pm_HugeSectors * (pmp->pm_BytesPerSec / bsize) 627 > psize)) { 628 DPRINTF(("consistency checks for gemdos\n")); 629 error = EINVAL; 630 goto error_exit; 631 } 632 /* 633 * XXX - Many parts of the msdos fs driver seem to assume that 634 * the number of bytes per logical sector (BytesPerSec) will 635 * always be the same as the number of bytes per disk block 636 * Let's pretend it is. 637 */ 638 tmp = pmp->pm_BytesPerSec / bsize; 639 pmp->pm_BytesPerSec = bsize; 640 pmp->pm_HugeSectors *= tmp; 641 pmp->pm_HiddenSects *= tmp; 642 pmp->pm_ResSectors *= tmp; 643 pmp->pm_Sectors *= tmp; 644 pmp->pm_FATsecs *= tmp; 645 SecPerClust *= tmp; 646 } 647 648 /* Check that fs has nonzero FAT size */ 649 if (pmp->pm_FATsecs == 0) { 650 DPRINTF(("FATsecs is 0\n")); 651 error = EINVAL; 652 goto error_exit; 653 } 654 655 pmp->pm_fatblk = pmp->pm_ResSectors; 656 if (FAT32(pmp)) { 657 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 658 pmp->pm_firstcluster = pmp->pm_fatblk 659 + (pmp->pm_FATs * pmp->pm_FATsecs); 660 pmp->pm_fsinfo = getushort(b710->bpbFSInfo); 661 } else { 662 pmp->pm_rootdirblk = pmp->pm_fatblk + 663 (pmp->pm_FATs * pmp->pm_FATsecs); 664 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 665 + pmp->pm_BytesPerSec - 1) 666 / pmp->pm_BytesPerSec;/* in sectors */ 667 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 668 } 669 670 pmp->pm_nmbrofclusters = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 671 SecPerClust; 672 pmp->pm_maxcluster = pmp->pm_nmbrofclusters + 1; 673 pmp->pm_fatsize = pmp->pm_FATsecs * pmp->pm_BytesPerSec; 674 675 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 676 if (pmp->pm_nmbrofclusters <= (0xff0 - 2)) { 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 } else if (pmp->pm_fatmask == 0) { 686 if (pmp->pm_maxcluster 687 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 688 /* 689 * This will usually be a floppy disk. This size makes 690 * sure that one fat entry will not be split across 691 * multiple blocks. 692 */ 693 pmp->pm_fatmask = FAT12_MASK; 694 pmp->pm_fatmult = 3; 695 pmp->pm_fatdiv = 2; 696 } else { 697 pmp->pm_fatmask = FAT16_MASK; 698 pmp->pm_fatmult = 2; 699 pmp->pm_fatdiv = 1; 700 } 701 } 702 if (FAT12(pmp)) 703 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 704 else 705 pmp->pm_fatblocksize = MAXBSIZE; 706 707 pmp->pm_fatblocksec = pmp->pm_fatblocksize / pmp->pm_BytesPerSec; 708 pmp->pm_bnshift = ffs(pmp->pm_BytesPerSec) - 1; 709 710 /* 711 * Compute mask and shift value for isolating cluster relative byte 712 * offsets and cluster numbers from a file offset. 713 */ 714 pmp->pm_bpcluster = SecPerClust * pmp->pm_BytesPerSec; 715 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 716 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 717 718 /* 719 * Check for valid cluster size 720 * must be a power of 2 721 */ 722 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 723 DPRINTF(("bpcluster %lu cnshift %lu\n", 724 pmp->pm_bpcluster, pmp->pm_cnshift)); 725 error = EINVAL; 726 goto error_exit; 727 } 728 729 /* 730 * Release the bootsector buffer. 731 */ 732 brelse(bp, BC_AGE); 733 bp = NULL; 734 735 /* 736 * Check FSInfo. 737 */ 738 if (pmp->pm_fsinfo) { 739 struct fsinfo *fp; 740 741 /* 742 * XXX If the fsinfo block is stored on media with 743 * 2KB or larger sectors, is the fsinfo structure 744 * padded at the end or in the middle? 745 */ 746 if ((error = bread(devvp, de_bn2kb(pmp, pmp->pm_fsinfo), 747 pmp->pm_BytesPerSec, NOCRED, 0, &bp)) != 0) 748 goto error_exit; 749 fp = (struct fsinfo *)bp->b_data; 750 if (!memcmp(fp->fsisig1, "RRaA", 4) 751 && !memcmp(fp->fsisig2, "rrAa", 4) 752 && !memcmp(fp->fsisig3, "\0\0\125\252", 4) 753 && !memcmp(fp->fsisig4, "\0\0\125\252", 4)) 754 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 755 else 756 pmp->pm_fsinfo = 0; 757 brelse(bp, 0); 758 bp = NULL; 759 } 760 761 /* 762 * Check and validate (or perhaps invalidate?) the fsinfo structure? 763 * XXX 764 */ 765 if (pmp->pm_fsinfo) { 766 if (pmp->pm_nxtfree == (u_long)-1) 767 pmp->pm_fsinfo = 0; 768 } 769 770 /* 771 * Allocate memory for the bitmap of allocated clusters, and then 772 * fill it in. 773 */ 774 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 775 / N_INUSEBITS) 776 * sizeof(*pmp->pm_inusemap), 777 M_MSDOSFSFAT, M_WAITOK); 778 779 /* 780 * fillinusemap() needs pm_devvp. 781 */ 782 pmp->pm_dev = dev; 783 pmp->pm_devvp = devvp; 784 785 /* 786 * Have the inuse map filled in. 787 */ 788 if ((error = fillinusemap(pmp)) != 0) { 789 DPRINTF(("fillinusemap %d\n", error)); 790 goto error_exit; 791 } 792 793 /* 794 * If they want fat updates to be synchronous then let them suffer 795 * the performance degradation in exchange for the on disk copy of 796 * the fat being correct just about all the time. I suppose this 797 * would be a good thing to turn on if the kernel is still flakey. 798 */ 799 if (mp->mnt_flag & MNT_SYNCHRONOUS) 800 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 801 802 /* 803 * Finish up. 804 */ 805 if (ronly) 806 pmp->pm_flags |= MSDOSFSMNT_RONLY; 807 else 808 pmp->pm_fmod = 1; 809 mp->mnt_data = pmp; 810 mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev; 811 mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_MSDOS); 812 mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; 813 mp->mnt_stat.f_namemax = MSDOSFS_NAMEMAX(pmp); 814 mp->mnt_flag |= MNT_LOCAL; 815 mp->mnt_dev_bshift = pmp->pm_bnshift; 816 mp->mnt_fs_bshift = pmp->pm_cnshift; 817 818 /* 819 * If we ever do quotas for DOS filesystems this would be a place 820 * to fill in the info in the msdosfsmount structure. You dolt, 821 * quotas on dos filesystems make no sense because files have no 822 * owners on dos filesystems. of course there is some empty space 823 * in the directory entry where we could put uid's and gid's. 824 */ 825 826 devvp->v_specmountpoint = mp; 827 828 return (0); 829 830 error_exit: 831 fstrans_unmount(mp); 832 if (bp) 833 brelse(bp, BC_AGE); 834 if (pmp) { 835 if (pmp->pm_inusemap) 836 free(pmp->pm_inusemap, M_MSDOSFSFAT); 837 free(pmp, M_MSDOSFSMNT); 838 mp->mnt_data = NULL; 839 } 840 return (error); 841 } 842 843 int 844 msdosfs_start(struct mount *mp, int flags) 845 { 846 847 return (0); 848 } 849 850 /* 851 * Unmount the filesystem described by mp. 852 */ 853 int 854 msdosfs_unmount(struct mount *mp, int mntflags) 855 { 856 struct msdosfsmount *pmp; 857 int error, flags; 858 859 flags = 0; 860 if (mntflags & MNT_FORCE) 861 flags |= FORCECLOSE; 862 if ((error = vflush(mp, NULLVP, flags)) != 0) 863 return (error); 864 pmp = VFSTOMSDOSFS(mp); 865 if (pmp->pm_devvp->v_type != VBAD) 866 pmp->pm_devvp->v_specmountpoint = NULL; 867 #ifdef MSDOSFS_DEBUG 868 { 869 struct vnode *vp = pmp->pm_devvp; 870 871 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 872 printf("flag %08x, usecount %d, writecount %d, holdcnt %d\n", 873 vp->v_vflag | vp->v_iflag | vp->v_uflag, vp->v_usecount, 874 vp->v_writecount, vp->v_holdcnt); 875 printf("mount %p, op %p\n", 876 vp->v_mount, vp->v_op); 877 printf("freef %p, freeb %p, mount %p\n", 878 vp->v_freelist.tqe_next, vp->v_freelist.tqe_prev, 879 vp->v_mount); 880 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %d, type %d\n", 881 vp->v_cleanblkhd.lh_first, 882 vp->v_dirtyblkhd.lh_first, 883 vp->v_numoutput, vp->v_type); 884 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 885 vp->v_socket, vp->v_tag, 886 ((u_int *)vp->v_data)[0], 887 ((u_int *)vp->v_data)[1]); 888 } 889 #endif 890 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY); 891 (void) VOP_CLOSE(pmp->pm_devvp, 892 pmp->pm_flags & MSDOSFSMNT_RONLY ? FREAD : FREAD|FWRITE, NOCRED); 893 vput(pmp->pm_devvp); 894 msdosfs_fh_destroy(pmp); 895 free(pmp->pm_inusemap, M_MSDOSFSFAT); 896 free(pmp, M_MSDOSFSMNT); 897 mp->mnt_data = NULL; 898 mp->mnt_flag &= ~MNT_LOCAL; 899 fstrans_unmount(mp); 900 return (0); 901 } 902 903 int 904 msdosfs_root(struct mount *mp, struct vnode **vpp) 905 { 906 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 907 struct denode *ndep; 908 int error; 909 910 #ifdef MSDOSFS_DEBUG 911 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 912 #endif 913 if ((error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep)) != 0) 914 return (error); 915 *vpp = DETOV(ndep); 916 return (0); 917 } 918 919 int 920 msdosfs_statvfs(struct mount *mp, struct statvfs *sbp) 921 { 922 struct msdosfsmount *pmp; 923 924 pmp = VFSTOMSDOSFS(mp); 925 sbp->f_bsize = pmp->pm_bpcluster; 926 sbp->f_frsize = sbp->f_bsize; 927 sbp->f_iosize = pmp->pm_bpcluster; 928 sbp->f_blocks = pmp->pm_nmbrofclusters; 929 sbp->f_bfree = pmp->pm_freeclustercount; 930 sbp->f_bavail = pmp->pm_freeclustercount; 931 sbp->f_bresvd = 0; 932 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 933 sbp->f_ffree = 0; /* what to put in here? */ 934 sbp->f_favail = 0; /* what to put in here? */ 935 sbp->f_fresvd = 0; 936 copy_statvfs_info(sbp, mp); 937 return (0); 938 } 939 940 int 941 msdosfs_sync(struct mount *mp, int waitfor, kauth_cred_t cred) 942 { 943 struct vnode *vp, *mvp; 944 struct denode *dep; 945 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 946 int error, allerror = 0; 947 948 /* 949 * If we ever switch to not updating all of the fats all the time, 950 * this would be the place to update them from the first one. 951 */ 952 if (pmp->pm_fmod != 0) { 953 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 954 panic("msdosfs_sync: rofs mod"); 955 else { 956 /* update fats here */ 957 } 958 } 959 /* Allocate a marker vnode. */ 960 mvp = vnalloc(mp); 961 fstrans_start(mp, FSTRANS_SHARED); 962 /* 963 * Write back each (modified) denode. 964 */ 965 mutex_enter(&mntvnode_lock); 966 loop: 967 for (vp = TAILQ_FIRST(&mp->mnt_vnodelist); vp; vp = vunmark(mvp)) { 968 vmark(mvp, vp); 969 if (vp->v_mount != mp || vismarker(vp)) 970 continue; 971 mutex_enter(vp->v_interlock); 972 dep = VTODE(vp); 973 if (waitfor == MNT_LAZY || vp->v_type == VNON || 974 dep == NULL || (((dep->de_flag & 975 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0) && 976 (LIST_EMPTY(&vp->v_dirtyblkhd) && 977 UVM_OBJ_IS_CLEAN(&vp->v_uobj)))) { 978 mutex_exit(vp->v_interlock); 979 continue; 980 } 981 mutex_exit(&mntvnode_lock); 982 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT); 983 if (error) { 984 mutex_enter(&mntvnode_lock); 985 if (error == ENOENT) { 986 (void)vunmark(mvp); 987 goto loop; 988 } 989 continue; 990 } 991 if ((error = VOP_FSYNC(vp, cred, 992 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0)) != 0) 993 allerror = error; 994 vput(vp); 995 mutex_enter(&mntvnode_lock); 996 } 997 mutex_exit(&mntvnode_lock); 998 vnfree(mvp); 999 1000 /* 1001 * Force stale file system control information to be flushed. 1002 */ 1003 if ((error = VOP_FSYNC(pmp->pm_devvp, cred, 1004 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0)) != 0) 1005 allerror = error; 1006 fstrans_done(mp); 1007 return (allerror); 1008 } 1009 1010 int 1011 msdosfs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) 1012 { 1013 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 1014 struct defid defh; 1015 struct denode *dep; 1016 uint32_t gen; 1017 int error; 1018 1019 if (fhp->fid_len != sizeof(struct defid)) { 1020 DPRINTF(("fid_len %d %zd\n", fhp->fid_len, 1021 sizeof(struct defid))); 1022 return EINVAL; 1023 } 1024 memcpy(&defh, fhp, sizeof(defh)); 1025 error = msdosfs_fh_lookup(pmp, defh.defid_dirclust, defh.defid_dirofs, 1026 &gen); 1027 if (error == 0 && gen != defh.defid_gen) 1028 error = ESTALE; 1029 if (error) { 1030 *vpp = NULLVP; 1031 return error; 1032 } 1033 error = deget(pmp, defh.defid_dirclust, defh.defid_dirofs, &dep); 1034 if (error) { 1035 DPRINTF(("deget %d\n", error)); 1036 *vpp = NULLVP; 1037 return (error); 1038 } 1039 *vpp = DETOV(dep); 1040 return (0); 1041 } 1042 1043 int 1044 msdosfs_vptofh(struct vnode *vp, struct fid *fhp, size_t *fh_size) 1045 { 1046 struct msdosfsmount *pmp = VFSTOMSDOSFS(vp->v_mount); 1047 struct denode *dep; 1048 struct defid defh; 1049 int error; 1050 1051 if (*fh_size < sizeof(struct defid)) { 1052 *fh_size = sizeof(struct defid); 1053 return E2BIG; 1054 } 1055 *fh_size = sizeof(struct defid); 1056 dep = VTODE(vp); 1057 memset(&defh, 0, sizeof(defh)); 1058 defh.defid_len = sizeof(struct defid); 1059 defh.defid_dirclust = dep->de_dirclust; 1060 defh.defid_dirofs = dep->de_diroffset; 1061 error = msdosfs_fh_enter(pmp, dep->de_dirclust, dep->de_diroffset, 1062 &defh.defid_gen); 1063 if (error == 0) 1064 memcpy(fhp, &defh, sizeof(defh)); 1065 return error; 1066 } 1067 1068 int 1069 msdosfs_vget(struct mount *mp, ino_t ino, 1070 struct vnode **vpp) 1071 { 1072 1073 return (EOPNOTSUPP); 1074 } 1075 1076 int 1077 msdosfs_suspendctl(struct mount *mp, int cmd) 1078 { 1079 int error; 1080 struct lwp *l = curlwp; 1081 1082 switch (cmd) { 1083 case SUSPEND_SUSPEND: 1084 if ((error = fstrans_setstate(mp, FSTRANS_SUSPENDING)) != 0) 1085 return error; 1086 error = msdosfs_sync(mp, MNT_WAIT, l->l_proc->p_cred); 1087 if (error == 0) 1088 error = fstrans_setstate(mp, FSTRANS_SUSPENDED); 1089 if (error != 0) { 1090 (void) fstrans_setstate(mp, FSTRANS_NORMAL); 1091 return error; 1092 } 1093 return 0; 1094 1095 case SUSPEND_RESUME: 1096 return fstrans_setstate(mp, FSTRANS_NORMAL); 1097 1098 default: 1099 return EINVAL; 1100 } 1101 } 1102