1 /* $NetBSD: msdosfs_vfsops.c,v 1.75 2009/04/25 21:26:20 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 1.75 2009/04/25 21:26:20 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/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 nameidata nd; 289 struct vnode *devvp; /* vnode for blk device to mount */ 290 struct msdosfs_args *args = data; /* holds data from mount request */ 291 /* msdosfs specific mount control block */ 292 struct msdosfsmount *pmp = NULL; 293 int error, flags; 294 mode_t accessmode; 295 296 if (*data_len < sizeof *args) 297 return EINVAL; 298 299 if (mp->mnt_flag & MNT_GETARGS) { 300 pmp = VFSTOMSDOSFS(mp); 301 if (pmp == NULL) 302 return EIO; 303 args->fspec = NULL; 304 args->uid = pmp->pm_uid; 305 args->gid = pmp->pm_gid; 306 args->mask = pmp->pm_mask; 307 args->flags = pmp->pm_flags; 308 args->version = MSDOSFSMNT_VERSION; 309 args->dirmask = pmp->pm_dirmask; 310 args->gmtoff = pmp->pm_gmtoff; 311 *data_len = sizeof *args; 312 return 0; 313 } 314 315 /* 316 * If not versioned (i.e. using old mount_msdos(8)), fill in 317 * the additional structure items with suitable defaults. 318 */ 319 if ((args->flags & MSDOSFSMNT_VERSIONED) == 0) { 320 args->version = 1; 321 args->dirmask = args->mask; 322 } 323 324 /* 325 * Reset GMT offset for pre-v3 mount structure args. 326 */ 327 if (args->version < 3) 328 args->gmtoff = 0; 329 330 /* 331 * If updating, check whether changing from read-only to 332 * read/write; if there is no device name, that's all we do. 333 */ 334 if (mp->mnt_flag & MNT_UPDATE) { 335 pmp = VFSTOMSDOSFS(mp); 336 error = 0; 337 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && 338 (mp->mnt_flag & MNT_RDONLY)) { 339 flags = WRITECLOSE; 340 if (mp->mnt_flag & MNT_FORCE) 341 flags |= FORCECLOSE; 342 error = vflush(mp, NULLVP, flags); 343 } 344 if (!error && (mp->mnt_flag & MNT_RELOAD)) 345 /* not yet implemented */ 346 error = EOPNOTSUPP; 347 if (error) { 348 DPRINTF(("vflush %d\n", error)); 349 return (error); 350 } 351 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && 352 (mp->mnt_iflag & IMNT_WANTRDWR)) { 353 /* 354 * If upgrade to read-write by non-root, then verify 355 * that user has necessary permissions on the device. 356 * 357 * Permission to update a mount is checked higher, so 358 * here we presume updating the mount is okay (for 359 * example, as far as securelevel goes) which leaves us 360 * with the normal check. 361 */ 362 devvp = pmp->pm_devvp; 363 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 364 error = genfs_can_mount(devvp, VREAD | VWRITE, 365 l->l_cred); 366 VOP_UNLOCK(devvp, 0); 367 DPRINTF(("genfs_can_mount %d\n", error)); 368 if (error) 369 return (error); 370 371 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 372 } 373 if (args->fspec == NULL) { 374 DPRINTF(("missing fspec\n")); 375 return EINVAL; 376 } 377 } 378 /* 379 * Not an update, or updating the name: look up the name 380 * and verify that it refers to a sensible block device. 381 */ 382 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, args->fspec); 383 if ((error = namei(&nd)) != 0) { 384 DPRINTF(("namei %d\n", error)); 385 return (error); 386 } 387 devvp = nd.ni_vp; 388 389 if (devvp->v_type != VBLK) { 390 DPRINTF(("not block\n")); 391 vrele(devvp); 392 return (ENOTBLK); 393 } 394 if (bdevsw_lookup(devvp->v_rdev) == NULL) { 395 DPRINTF(("no block switch\n")); 396 vrele(devvp); 397 return (ENXIO); 398 } 399 /* 400 * If mount by non-root, then verify that user has necessary 401 * permissions on the device. 402 */ 403 accessmode = VREAD; 404 if ((mp->mnt_flag & MNT_RDONLY) == 0) 405 accessmode |= VWRITE; 406 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 407 error = genfs_can_mount(devvp, accessmode, l->l_cred); 408 VOP_UNLOCK(devvp, 0); 409 if (error) { 410 DPRINTF(("genfs_can_mount %d\n", error)); 411 vrele(devvp); 412 return (error); 413 } 414 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 415 int xflags; 416 417 if (mp->mnt_flag & MNT_RDONLY) 418 xflags = FREAD; 419 else 420 xflags = FREAD|FWRITE; 421 error = VOP_OPEN(devvp, xflags, FSCRED); 422 if (error) { 423 DPRINTF(("VOP_OPEN %d\n", error)); 424 goto fail; 425 } 426 error = msdosfs_mountfs(devvp, mp, l, args); 427 if (error) { 428 DPRINTF(("msdosfs_mountfs %d\n", error)); 429 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 430 (void) VOP_CLOSE(devvp, xflags, NOCRED); 431 VOP_UNLOCK(devvp, 0); 432 goto fail; 433 } 434 #ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 435 pmp = VFSTOMSDOSFS(mp); 436 #endif 437 } else { 438 vrele(devvp); 439 if (devvp != pmp->pm_devvp) { 440 DPRINTF(("devvp %p pmp %p\n", 441 devvp, pmp->pm_devvp)); 442 return (EINVAL); /* needs translation */ 443 } 444 } 445 if ((error = update_mp(mp, args)) != 0) { 446 msdosfs_unmount(mp, MNT_FORCE); 447 DPRINTF(("update_mp %d\n", error)); 448 return error; 449 } 450 451 #ifdef MSDOSFS_DEBUG 452 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 453 #endif 454 return set_statvfs_info(path, UIO_USERSPACE, args->fspec, UIO_USERSPACE, 455 mp->mnt_op->vfs_name, mp, l); 456 457 fail: 458 vrele(devvp); 459 return (error); 460 } 461 462 int 463 msdosfs_mountfs(struct vnode *devvp, struct mount *mp, struct lwp *l, struct msdosfs_args *argp) 464 { 465 struct msdosfsmount *pmp; 466 struct buf *bp; 467 dev_t dev = devvp->v_rdev; 468 struct partinfo dpart; 469 union bootsector *bsp; 470 struct byte_bpb33 *b33; 471 struct byte_bpb50 *b50; 472 struct byte_bpb710 *b710; 473 u_int8_t SecPerClust; 474 int ronly, error, tmp; 475 int bsize, dtype, fstype, secsize; 476 u_int64_t psize; 477 478 /* Flush out any old buffers remaining from a previous use. */ 479 if ((error = vinvalbuf(devvp, V_SAVE, l->l_cred, l, 0, 0)) != 0) 480 return (error); 481 482 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 483 484 bp = NULL; /* both used in error_exit */ 485 pmp = NULL; 486 487 /* 488 * We need the disklabel to calculate the size of a FAT entry 489 * later on. Also make sure the partition contains a filesystem 490 * of type FS_MSDOS. This doesn't work for floppies, so we have 491 * to check for them too. 492 * 493 * There might still be parts of the msdos fs driver which assume 494 * that the size of a disk block will always be 512 bytes. 495 * Let's root them out... 496 */ 497 error = VOP_IOCTL(devvp, DIOCGPART, &dpart, FREAD, NOCRED); 498 if (error == 0) { 499 secsize = dpart.disklab->d_secsize; 500 dtype = dpart.disklab->d_type; 501 fstype = dpart.part->p_fstype; 502 psize = dpart.part->p_size; 503 } else { 504 struct dkwedge_info dkw; 505 error = VOP_IOCTL(devvp, DIOCGWEDGEINFO, &dkw, FREAD, NOCRED); 506 secsize = 512; /* XXX */ 507 dtype = DTYPE_FLOPPY; /* XXX */ 508 fstype = FS_MSDOS; 509 psize = -1; 510 if (error) { 511 if (error != ENOTTY) { 512 DPRINTF(("Error getting partition info %d\n", 513 error)); 514 goto error_exit; 515 } 516 } else { 517 fstype = strcmp(dkw.dkw_ptype, DKW_PTYPE_FAT) == 0 ? 518 FS_MSDOS : -1; 519 psize = dkw.dkw_size; 520 } 521 } 522 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 523 bsize = secsize; 524 if (bsize != 512) { 525 DPRINTF(("bsize %d dtype %d fstype %d\n", bsize, dtype, 526 fstype)); 527 error = EINVAL; 528 goto error_exit; 529 } 530 } else 531 bsize = 0; 532 533 /* 534 * Read the boot sector of the filesystem, and then check the 535 * boot signature. If not a dos boot sector then error out. 536 */ 537 if ((error = bread(devvp, 0, secsize, NOCRED, 0, &bp)) != 0) 538 goto error_exit; 539 bsp = (union bootsector *)bp->b_data; 540 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 541 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 542 b710 = (struct byte_bpb710 *)bsp->bs710.bsBPB; 543 544 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 545 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 546 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 547 DPRINTF(("bootsig0 %d bootsig1 %d\n", 548 bsp->bs50.bsBootSectSig0, 549 bsp->bs50.bsBootSectSig1)); 550 error = EINVAL; 551 goto error_exit; 552 } 553 } 554 555 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK); 556 memset(pmp, 0, sizeof *pmp); 557 pmp->pm_mountp = mp; 558 559 /* 560 * Compute several useful quantities from the bpb in the 561 * bootsector. Copy in the dos 5 variant of the bpb then fix up 562 * the fields that are different between dos 5 and dos 3.3. 563 */ 564 SecPerClust = b50->bpbSecPerClust; 565 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 566 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 567 pmp->pm_FATs = b50->bpbFATs; 568 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 569 pmp->pm_Sectors = getushort(b50->bpbSectors); 570 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 571 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 572 pmp->pm_Heads = getushort(b50->bpbHeads); 573 pmp->pm_Media = b50->bpbMedia; 574 575 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 576 /* XXX - We should probably check more values here */ 577 if (!pmp->pm_BytesPerSec || !SecPerClust 578 || pmp->pm_SecPerTrack > 63) { 579 DPRINTF(("bytespersec %d secperclust %d " 580 "secpertrack %d\n", 581 pmp->pm_BytesPerSec, SecPerClust, 582 pmp->pm_SecPerTrack)); 583 error = EINVAL; 584 goto error_exit; 585 } 586 } 587 588 if (pmp->pm_Sectors == 0) { 589 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 590 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 591 } else { 592 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 593 pmp->pm_HugeSectors = pmp->pm_Sectors; 594 } 595 596 if (pmp->pm_RootDirEnts == 0) { 597 unsigned short vers = getushort(b710->bpbFSVers); 598 /* 599 * Some say that bsBootSectSig[23] must be zero, but 600 * Windows does not require this and some digital cameras 601 * do not set these to zero. Therefore, do not insist. 602 */ 603 if (pmp->pm_Sectors || pmp->pm_FATsecs || vers) { 604 DPRINTF(("sectors %d fatsecs %lu vers %d\n", 605 pmp->pm_Sectors, pmp->pm_FATsecs, vers)); 606 error = EINVAL; 607 goto error_exit; 608 } 609 pmp->pm_fatmask = FAT32_MASK; 610 pmp->pm_fatmult = 4; 611 pmp->pm_fatdiv = 1; 612 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 613 614 /* mirrorring is enabled if the FATMIRROR bit is not set */ 615 if ((getushort(b710->bpbExtFlags) & FATMIRROR) == 0) 616 pmp->pm_flags |= MSDOSFS_FATMIRROR; 617 else 618 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 619 } else 620 pmp->pm_flags |= MSDOSFS_FATMIRROR; 621 622 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 623 if (FAT32(pmp)) { 624 DPRINTF(("fat32 for gemdos\n")); 625 /* 626 * GEMDOS doesn't know fat32. 627 */ 628 error = EINVAL; 629 goto error_exit; 630 } 631 632 /* 633 * Check a few values (could do some more): 634 * - logical sector size: power of 2, >= block size 635 * - sectors per cluster: power of 2, >= 1 636 * - number of sectors: >= 1, <= size of partition 637 */ 638 if ( (SecPerClust == 0) 639 || (SecPerClust & (SecPerClust - 1)) 640 || (pmp->pm_BytesPerSec < bsize) 641 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 642 || (pmp->pm_HugeSectors == 0) 643 || (pmp->pm_HugeSectors * (pmp->pm_BytesPerSec / bsize) 644 > psize)) { 645 DPRINTF(("consistency checks for gemdos\n")); 646 error = EINVAL; 647 goto error_exit; 648 } 649 /* 650 * XXX - Many parts of the msdos fs driver seem to assume that 651 * the number of bytes per logical sector (BytesPerSec) will 652 * always be the same as the number of bytes per disk block 653 * Let's pretend it is. 654 */ 655 tmp = pmp->pm_BytesPerSec / bsize; 656 pmp->pm_BytesPerSec = bsize; 657 pmp->pm_HugeSectors *= tmp; 658 pmp->pm_HiddenSects *= tmp; 659 pmp->pm_ResSectors *= tmp; 660 pmp->pm_Sectors *= tmp; 661 pmp->pm_FATsecs *= tmp; 662 SecPerClust *= tmp; 663 } 664 665 /* Check that fs has nonzero FAT size */ 666 if (pmp->pm_FATsecs == 0) { 667 DPRINTF(("FATsecs is 0\n")); 668 error = EINVAL; 669 goto error_exit; 670 } 671 672 pmp->pm_fatblk = pmp->pm_ResSectors; 673 if (FAT32(pmp)) { 674 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 675 pmp->pm_firstcluster = pmp->pm_fatblk 676 + (pmp->pm_FATs * pmp->pm_FATsecs); 677 pmp->pm_fsinfo = getushort(b710->bpbFSInfo); 678 } else { 679 pmp->pm_rootdirblk = pmp->pm_fatblk + 680 (pmp->pm_FATs * pmp->pm_FATsecs); 681 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 682 + pmp->pm_BytesPerSec - 1) 683 / pmp->pm_BytesPerSec;/* in sectors */ 684 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 685 } 686 687 pmp->pm_nmbrofclusters = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 688 SecPerClust; 689 pmp->pm_maxcluster = pmp->pm_nmbrofclusters + 1; 690 pmp->pm_fatsize = pmp->pm_FATsecs * pmp->pm_BytesPerSec; 691 692 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 693 if (pmp->pm_nmbrofclusters <= (0xff0 - 2) 694 && (dtype == DTYPE_FLOPPY 695 || (dtype == DTYPE_VND 696 && (pmp->pm_Heads == 1 || pmp->pm_Heads == 2))) 697 ) { 698 pmp->pm_fatmask = FAT12_MASK; 699 pmp->pm_fatmult = 3; 700 pmp->pm_fatdiv = 2; 701 } else { 702 pmp->pm_fatmask = FAT16_MASK; 703 pmp->pm_fatmult = 2; 704 pmp->pm_fatdiv = 1; 705 } 706 } else if (pmp->pm_fatmask == 0) { 707 if (pmp->pm_maxcluster 708 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 709 /* 710 * This will usually be a floppy disk. This size makes 711 * sure that one fat entry will not be split across 712 * multiple blocks. 713 */ 714 pmp->pm_fatmask = FAT12_MASK; 715 pmp->pm_fatmult = 3; 716 pmp->pm_fatdiv = 2; 717 } else { 718 pmp->pm_fatmask = FAT16_MASK; 719 pmp->pm_fatmult = 2; 720 pmp->pm_fatdiv = 1; 721 } 722 } 723 if (FAT12(pmp)) 724 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 725 else 726 pmp->pm_fatblocksize = MAXBSIZE; 727 728 pmp->pm_fatblocksec = pmp->pm_fatblocksize / pmp->pm_BytesPerSec; 729 pmp->pm_bnshift = ffs(pmp->pm_BytesPerSec) - 1; 730 731 /* 732 * Compute mask and shift value for isolating cluster relative byte 733 * offsets and cluster numbers from a file offset. 734 */ 735 pmp->pm_bpcluster = SecPerClust * pmp->pm_BytesPerSec; 736 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 737 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 738 739 /* 740 * Check for valid cluster size 741 * must be a power of 2 742 */ 743 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 744 DPRINTF(("bpcluster %lu cnshift %lu\n", 745 pmp->pm_bpcluster, pmp->pm_cnshift)); 746 error = EINVAL; 747 goto error_exit; 748 } 749 750 /* 751 * Release the bootsector buffer. 752 */ 753 brelse(bp, BC_AGE); 754 bp = NULL; 755 756 /* 757 * Check FSInfo. 758 */ 759 if (pmp->pm_fsinfo) { 760 struct fsinfo *fp; 761 762 /* 763 * XXX If the fsinfo block is stored on media with 764 * 2KB or larger sectors, is the fsinfo structure 765 * padded at the end or in the middle? 766 */ 767 if ((error = bread(devvp, de_bn2kb(pmp, pmp->pm_fsinfo), 768 pmp->pm_BytesPerSec, NOCRED, 0, &bp)) != 0) 769 goto error_exit; 770 fp = (struct fsinfo *)bp->b_data; 771 if (!memcmp(fp->fsisig1, "RRaA", 4) 772 && !memcmp(fp->fsisig2, "rrAa", 4) 773 && !memcmp(fp->fsisig3, "\0\0\125\252", 4) 774 && !memcmp(fp->fsisig4, "\0\0\125\252", 4)) 775 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 776 else 777 pmp->pm_fsinfo = 0; 778 brelse(bp, 0); 779 bp = NULL; 780 } 781 782 /* 783 * Check and validate (or perhaps invalidate?) the fsinfo structure? 784 * XXX 785 */ 786 if (pmp->pm_fsinfo) { 787 if (pmp->pm_nxtfree == (u_long)-1) 788 pmp->pm_fsinfo = 0; 789 } 790 791 /* 792 * Allocate memory for the bitmap of allocated clusters, and then 793 * fill it in. 794 */ 795 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 796 / N_INUSEBITS) 797 * sizeof(*pmp->pm_inusemap), 798 M_MSDOSFSFAT, M_WAITOK); 799 800 /* 801 * fillinusemap() needs pm_devvp. 802 */ 803 pmp->pm_dev = dev; 804 pmp->pm_devvp = devvp; 805 806 /* 807 * Have the inuse map filled in. 808 */ 809 if ((error = fillinusemap(pmp)) != 0) { 810 DPRINTF(("fillinusemap %d\n", error)); 811 goto error_exit; 812 } 813 814 /* 815 * If they want fat updates to be synchronous then let them suffer 816 * the performance degradation in exchange for the on disk copy of 817 * the fat being correct just about all the time. I suppose this 818 * would be a good thing to turn on if the kernel is still flakey. 819 */ 820 if (mp->mnt_flag & MNT_SYNCHRONOUS) 821 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 822 823 /* 824 * Finish up. 825 */ 826 if (ronly) 827 pmp->pm_flags |= MSDOSFSMNT_RONLY; 828 else 829 pmp->pm_fmod = 1; 830 mp->mnt_data = pmp; 831 mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev; 832 mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_MSDOS); 833 mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; 834 mp->mnt_stat.f_namemax = MSDOSFS_NAMEMAX(pmp); 835 mp->mnt_flag |= MNT_LOCAL; 836 mp->mnt_dev_bshift = pmp->pm_bnshift; 837 mp->mnt_fs_bshift = pmp->pm_cnshift; 838 839 /* 840 * If we ever do quotas for DOS filesystems this would be a place 841 * to fill in the info in the msdosfsmount structure. You dolt, 842 * quotas on dos filesystems make no sense because files have no 843 * owners on dos filesystems. of course there is some empty space 844 * in the directory entry where we could put uid's and gid's. 845 */ 846 847 devvp->v_specmountpoint = mp; 848 849 return (0); 850 851 error_exit:; 852 if (bp) 853 brelse(bp, BC_AGE); 854 if (pmp) { 855 if (pmp->pm_inusemap) 856 free(pmp->pm_inusemap, M_MSDOSFSFAT); 857 free(pmp, M_MSDOSFSMNT); 858 mp->mnt_data = NULL; 859 } 860 return (error); 861 } 862 863 int 864 msdosfs_start(struct mount *mp, int flags) 865 { 866 867 return (0); 868 } 869 870 /* 871 * Unmount the filesystem described by mp. 872 */ 873 int 874 msdosfs_unmount(struct mount *mp, int mntflags) 875 { 876 struct msdosfsmount *pmp; 877 int error, flags; 878 879 flags = 0; 880 if (mntflags & MNT_FORCE) 881 flags |= FORCECLOSE; 882 if ((error = vflush(mp, NULLVP, flags)) != 0) 883 return (error); 884 pmp = VFSTOMSDOSFS(mp); 885 if (pmp->pm_devvp->v_type != VBAD) 886 pmp->pm_devvp->v_specmountpoint = NULL; 887 #ifdef MSDOSFS_DEBUG 888 { 889 struct vnode *vp = pmp->pm_devvp; 890 891 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 892 printf("flag %08x, usecount %d, writecount %d, holdcnt %d\n", 893 vp->v_vflag | vp->v_iflag | vp->v_uflag, vp->v_usecount, 894 vp->v_writecount, vp->v_holdcnt); 895 printf("mount %p, op %p\n", 896 vp->v_mount, vp->v_op); 897 printf("freef %p, freeb %p, mount %p\n", 898 vp->v_freelist.tqe_next, vp->v_freelist.tqe_prev, 899 vp->v_mount); 900 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %d, type %d\n", 901 vp->v_cleanblkhd.lh_first, 902 vp->v_dirtyblkhd.lh_first, 903 vp->v_numoutput, vp->v_type); 904 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 905 vp->v_socket, vp->v_tag, 906 ((u_int *)vp->v_data)[0], 907 ((u_int *)vp->v_data)[1]); 908 } 909 #endif 910 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY); 911 error = VOP_CLOSE(pmp->pm_devvp, 912 pmp->pm_flags & MSDOSFSMNT_RONLY ? FREAD : FREAD|FWRITE, NOCRED); 913 vput(pmp->pm_devvp); 914 free(pmp->pm_inusemap, M_MSDOSFSFAT); 915 free(pmp, M_MSDOSFSMNT); 916 mp->mnt_data = NULL; 917 mp->mnt_flag &= ~MNT_LOCAL; 918 return (error); 919 } 920 921 int 922 msdosfs_root(struct mount *mp, struct vnode **vpp) 923 { 924 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 925 struct denode *ndep; 926 int error; 927 928 #ifdef MSDOSFS_DEBUG 929 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 930 #endif 931 if ((error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep)) != 0) 932 return (error); 933 *vpp = DETOV(ndep); 934 return (0); 935 } 936 937 int 938 msdosfs_statvfs(struct mount *mp, struct statvfs *sbp) 939 { 940 struct msdosfsmount *pmp; 941 942 pmp = VFSTOMSDOSFS(mp); 943 sbp->f_bsize = pmp->pm_bpcluster; 944 sbp->f_frsize = sbp->f_bsize; 945 sbp->f_iosize = pmp->pm_bpcluster; 946 sbp->f_blocks = pmp->pm_nmbrofclusters; 947 sbp->f_bfree = pmp->pm_freeclustercount; 948 sbp->f_bavail = pmp->pm_freeclustercount; 949 sbp->f_bresvd = 0; 950 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 951 sbp->f_ffree = 0; /* what to put in here? */ 952 sbp->f_favail = 0; /* what to put in here? */ 953 sbp->f_fresvd = 0; 954 copy_statvfs_info(sbp, mp); 955 return (0); 956 } 957 958 int 959 msdosfs_sync(struct mount *mp, int waitfor, kauth_cred_t cred) 960 { 961 struct vnode *vp, *mvp; 962 struct denode *dep; 963 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 964 int error, allerror = 0; 965 966 /* 967 * If we ever switch to not updating all of the fats all the time, 968 * this would be the place to update them from the first one. 969 */ 970 if (pmp->pm_fmod != 0) { 971 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 972 panic("msdosfs_sync: rofs mod"); 973 else { 974 /* update fats here */ 975 } 976 } 977 /* Allocate a marker vnode. */ 978 if ((mvp = vnalloc(mp)) == NULL) 979 return ENOMEM; 980 /* 981 * Write back each (modified) denode. 982 */ 983 mutex_enter(&mntvnode_lock); 984 loop: 985 for (vp = TAILQ_FIRST(&mp->mnt_vnodelist); vp; vp = vunmark(mvp)) { 986 vmark(mvp, vp); 987 if (vp->v_mount != mp || vismarker(vp)) 988 continue; 989 mutex_enter(&vp->v_interlock); 990 dep = VTODE(vp); 991 if (waitfor == MNT_LAZY || vp->v_type == VNON || 992 (((dep->de_flag & 993 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0) && 994 (LIST_EMPTY(&vp->v_dirtyblkhd) && 995 UVM_OBJ_IS_CLEAN(&vp->v_uobj)))) { 996 mutex_exit(&vp->v_interlock); 997 continue; 998 } 999 mutex_exit(&mntvnode_lock); 1000 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK); 1001 if (error) { 1002 mutex_enter(&mntvnode_lock); 1003 if (error == ENOENT) { 1004 (void)vunmark(mvp); 1005 goto loop; 1006 } 1007 continue; 1008 } 1009 if ((error = VOP_FSYNC(vp, cred, 1010 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0)) != 0) 1011 allerror = error; 1012 vput(vp); 1013 mutex_enter(&mntvnode_lock); 1014 } 1015 mutex_exit(&mntvnode_lock); 1016 vnfree(mvp); 1017 1018 /* 1019 * Force stale file system control information to be flushed. 1020 */ 1021 if ((error = VOP_FSYNC(pmp->pm_devvp, cred, 1022 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0)) != 0) 1023 allerror = error; 1024 return (allerror); 1025 } 1026 1027 int 1028 msdosfs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) 1029 { 1030 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 1031 struct defid defh; 1032 struct denode *dep; 1033 int error; 1034 1035 if (fhp->fid_len != sizeof(struct defid)) { 1036 DPRINTF(("fid_len %d %zd\n", fhp->fid_len, 1037 sizeof(struct defid))); 1038 return EINVAL; 1039 } 1040 1041 memcpy(&defh, fhp, sizeof(defh)); 1042 error = deget(pmp, defh.defid_dirclust, defh.defid_dirofs, &dep); 1043 if (error) { 1044 DPRINTF(("deget %d\n", error)); 1045 *vpp = NULLVP; 1046 return (error); 1047 } 1048 *vpp = DETOV(dep); 1049 return (0); 1050 } 1051 1052 int 1053 msdosfs_vptofh(struct vnode *vp, struct fid *fhp, size_t *fh_size) 1054 { 1055 struct denode *dep; 1056 struct defid defh; 1057 1058 if (*fh_size < sizeof(struct defid)) { 1059 *fh_size = sizeof(struct defid); 1060 return E2BIG; 1061 } 1062 *fh_size = sizeof(struct defid); 1063 dep = VTODE(vp); 1064 memset(&defh, 0, sizeof(defh)); 1065 defh.defid_len = sizeof(struct defid); 1066 defh.defid_dirclust = dep->de_dirclust; 1067 defh.defid_dirofs = dep->de_diroffset; 1068 /* defh.defid_gen = dep->de_gen; */ 1069 memcpy(fhp, &defh, sizeof(defh)); 1070 return (0); 1071 } 1072 1073 int 1074 msdosfs_vget(struct mount *mp, ino_t ino, 1075 struct vnode **vpp) 1076 { 1077 1078 return (EOPNOTSUPP); 1079 } 1080