1 /* $NetBSD: msdosfs_vfsops.c,v 1.76 2009/06/29 05:08:17 dholland 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 1.76 2009/06/29 05:08:17 dholland Exp $"); 52 53 #if defined(_KERNEL_OPT) 54 #include "opt_compat_netbsd.h" 55 #endif 56 57 #include <sys/param.h> 58 #include <sys/systm.h> 59 #include <sys/sysctl.h> 60 #include <sys/namei.h> 61 #include <sys/proc.h> 62 #include <sys/kernel.h> 63 #include <sys/vnode.h> 64 #include <miscfs/genfs/genfs.h> 65 #include <miscfs/specfs/specdev.h> /* XXX */ /* defines v_rdev */ 66 #include <sys/mount.h> 67 #include <sys/buf.h> 68 #include <sys/file.h> 69 #include <sys/device.h> 70 #include <sys/disklabel.h> 71 #include <sys/disk.h> 72 #include <sys/ioctl.h> 73 #include <sys/malloc.h> 74 #include <sys/dirent.h> 75 #include <sys/stat.h> 76 #include <sys/conf.h> 77 #include <sys/kauth.h> 78 #include <sys/module.h> 79 80 #include <fs/msdosfs/bpb.h> 81 #include <fs/msdosfs/bootsect.h> 82 #include <fs/msdosfs/direntry.h> 83 #include <fs/msdosfs/denode.h> 84 #include <fs/msdosfs/msdosfsmount.h> 85 #include <fs/msdosfs/fat.h> 86 87 MODULE(MODULE_CLASS_VFS, msdosfs, NULL); 88 89 #ifdef MSDOSFS_DEBUG 90 #define DPRINTF(a) uprintf a 91 #else 92 #define DPRINTF(a) 93 #endif 94 95 #define MSDOSFS_NAMEMAX(pmp) \ 96 (pmp)->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12 97 98 VFS_PROTOS(msdosfs); 99 100 int msdosfs_mountfs(struct vnode *, struct mount *, struct lwp *, 101 struct msdosfs_args *); 102 103 static int update_mp(struct mount *, struct msdosfs_args *); 104 105 MALLOC_JUSTDEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOS FS mount structure"); 106 MALLOC_JUSTDEFINE(M_MSDOSFSFAT, "MSDOSFS fat", "MSDOS FS fat table"); 107 MALLOC_JUSTDEFINE(M_MSDOSFSTMP, "MSDOSFS temp", "MSDOS FS temp. structures"); 108 109 #define ROOTNAME "root_device" 110 111 static struct sysctllog *msdosfs_sysctl_log; 112 113 extern const struct vnodeopv_desc msdosfs_vnodeop_opv_desc; 114 115 const struct vnodeopv_desc * const msdosfs_vnodeopv_descs[] = { 116 &msdosfs_vnodeop_opv_desc, 117 NULL, 118 }; 119 120 struct vfsops msdosfs_vfsops = { 121 MOUNT_MSDOS, 122 sizeof (struct msdosfs_args), 123 msdosfs_mount, 124 msdosfs_start, 125 msdosfs_unmount, 126 msdosfs_root, 127 (void *)eopnotsupp, /* vfs_quotactl */ 128 msdosfs_statvfs, 129 msdosfs_sync, 130 msdosfs_vget, 131 msdosfs_fhtovp, 132 msdosfs_vptofh, 133 msdosfs_init, 134 msdosfs_reinit, 135 msdosfs_done, 136 msdosfs_mountroot, 137 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 138 vfs_stdextattrctl, 139 (void *)eopnotsupp, /* vfs_suspendctl */ 140 genfs_renamelock_enter, 141 genfs_renamelock_exit, 142 (void *)eopnotsupp, 143 msdosfs_vnodeopv_descs, 144 0, 145 { NULL, NULL }, 146 }; 147 148 static int 149 msdosfs_modcmd(modcmd_t cmd, void *arg) 150 { 151 int error; 152 153 switch (cmd) { 154 case MODULE_CMD_INIT: 155 error = vfs_attach(&msdosfs_vfsops); 156 if (error != 0) 157 break; 158 sysctl_createv(&msdosfs_sysctl_log, 0, NULL, NULL, 159 CTLFLAG_PERMANENT, 160 CTLTYPE_NODE, "vfs", NULL, 161 NULL, 0, NULL, 0, 162 CTL_VFS, CTL_EOL); 163 sysctl_createv(&msdosfs_sysctl_log, 0, NULL, NULL, 164 CTLFLAG_PERMANENT, 165 CTLTYPE_NODE, "msdosfs", 166 SYSCTL_DESCR("MS-DOS file system"), 167 NULL, 0, NULL, 0, 168 CTL_VFS, 4, CTL_EOL); 169 /* 170 * XXX the "4" above could be dynamic, thereby eliminating one 171 * more instance of the "number to vfs" mapping problem, but 172 * "4" is the order as taken from sys/mount.h 173 */ 174 break; 175 case MODULE_CMD_FINI: 176 error = vfs_detach(&msdosfs_vfsops); 177 if (error != 0) 178 break; 179 sysctl_teardown(&msdosfs_sysctl_log); 180 break; 181 default: 182 error = ENOTTY; 183 break; 184 } 185 186 return (error); 187 } 188 189 static int 190 update_mp(struct mount *mp, struct msdosfs_args *argp) 191 { 192 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 193 int error; 194 195 pmp->pm_gid = argp->gid; 196 pmp->pm_uid = argp->uid; 197 pmp->pm_mask = argp->mask & ALLPERMS; 198 pmp->pm_dirmask = argp->dirmask & ALLPERMS; 199 pmp->pm_gmtoff = argp->gmtoff; 200 pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT; 201 202 /* 203 * GEMDOS knows nothing about win95 long filenames 204 */ 205 if (pmp->pm_flags & MSDOSFSMNT_GEMDOSFS) 206 pmp->pm_flags |= MSDOSFSMNT_NOWIN95; 207 208 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 209 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 210 else if (!(pmp->pm_flags & 211 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 212 struct vnode *rtvp; 213 214 /* 215 * Try to divine whether to support Win'95 long filenames 216 */ 217 if (FAT32(pmp)) 218 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 219 else { 220 if ((error = msdosfs_root(mp, &rtvp)) != 0) 221 return error; 222 pmp->pm_flags |= findwin95(VTODE(rtvp)) 223 ? MSDOSFSMNT_LONGNAME 224 : MSDOSFSMNT_SHORTNAME; 225 vput(rtvp); 226 } 227 } 228 229 mp->mnt_stat.f_namemax = MSDOSFS_NAMEMAX(pmp); 230 231 return 0; 232 } 233 234 int 235 msdosfs_mountroot(void) 236 { 237 struct mount *mp; 238 struct lwp *l = curlwp; /* XXX */ 239 int error; 240 struct msdosfs_args args; 241 242 if (device_class(root_device) != DV_DISK) 243 return (ENODEV); 244 245 if ((error = vfs_rootmountalloc(MOUNT_MSDOS, "root_device", &mp))) { 246 vrele(rootvp); 247 return (error); 248 } 249 250 args.flags = MSDOSFSMNT_VERSIONED; 251 args.uid = 0; 252 args.gid = 0; 253 args.mask = 0777; 254 args.version = MSDOSFSMNT_VERSION; 255 args.dirmask = 0777; 256 257 if ((error = msdosfs_mountfs(rootvp, mp, l, &args)) != 0) { 258 vfs_unbusy(mp, false, NULL); 259 vfs_destroy(mp); 260 return (error); 261 } 262 263 if ((error = update_mp(mp, &args)) != 0) { 264 (void)msdosfs_unmount(mp, 0); 265 vfs_unbusy(mp, false, NULL); 266 vfs_destroy(mp); 267 vrele(rootvp); 268 return (error); 269 } 270 271 mutex_enter(&mountlist_lock); 272 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 273 mutex_exit(&mountlist_lock); 274 (void)msdosfs_statvfs(mp, &mp->mnt_stat); 275 vfs_unbusy(mp, false, NULL); 276 return (0); 277 } 278 279 /* 280 * mp - path - addr in user space of mount point (ie /usr or whatever) 281 * data - addr in user space of mount params including the name of the block 282 * special file to treat as a filesystem. 283 */ 284 int 285 msdosfs_mount(struct mount *mp, const char *path, void *data, size_t *data_len) 286 { 287 struct lwp *l = curlwp; 288 struct vnode *devvp; /* vnode for blk device to mount */ 289 struct msdosfs_args *args = data; /* holds data from mount request */ 290 /* msdosfs specific mount control block */ 291 struct msdosfsmount *pmp = NULL; 292 int error, flags; 293 mode_t accessmode; 294 295 if (*data_len < sizeof *args) 296 return EINVAL; 297 298 if (mp->mnt_flag & MNT_GETARGS) { 299 pmp = VFSTOMSDOSFS(mp); 300 if (pmp == NULL) 301 return EIO; 302 args->fspec = NULL; 303 args->uid = pmp->pm_uid; 304 args->gid = pmp->pm_gid; 305 args->mask = pmp->pm_mask; 306 args->flags = pmp->pm_flags; 307 args->version = MSDOSFSMNT_VERSION; 308 args->dirmask = pmp->pm_dirmask; 309 args->gmtoff = pmp->pm_gmtoff; 310 *data_len = sizeof *args; 311 return 0; 312 } 313 314 /* 315 * If not versioned (i.e. using old mount_msdos(8)), fill in 316 * the additional structure items with suitable defaults. 317 */ 318 if ((args->flags & MSDOSFSMNT_VERSIONED) == 0) { 319 args->version = 1; 320 args->dirmask = args->mask; 321 } 322 323 /* 324 * Reset GMT offset for pre-v3 mount structure args. 325 */ 326 if (args->version < 3) 327 args->gmtoff = 0; 328 329 /* 330 * If updating, check whether changing from read-only to 331 * read/write; if there is no device name, that's all we do. 332 */ 333 if (mp->mnt_flag & MNT_UPDATE) { 334 pmp = VFSTOMSDOSFS(mp); 335 error = 0; 336 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && 337 (mp->mnt_flag & MNT_RDONLY)) { 338 flags = WRITECLOSE; 339 if (mp->mnt_flag & MNT_FORCE) 340 flags |= FORCECLOSE; 341 error = vflush(mp, NULLVP, flags); 342 } 343 if (!error && (mp->mnt_flag & MNT_RELOAD)) 344 /* not yet implemented */ 345 error = EOPNOTSUPP; 346 if (error) { 347 DPRINTF(("vflush %d\n", error)); 348 return (error); 349 } 350 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && 351 (mp->mnt_iflag & IMNT_WANTRDWR)) { 352 /* 353 * If upgrade to read-write by non-root, then verify 354 * that user has necessary permissions on the device. 355 * 356 * Permission to update a mount is checked higher, so 357 * here we presume updating the mount is okay (for 358 * example, as far as securelevel goes) which leaves us 359 * with the normal check. 360 */ 361 devvp = pmp->pm_devvp; 362 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 363 error = genfs_can_mount(devvp, VREAD | VWRITE, 364 l->l_cred); 365 VOP_UNLOCK(devvp, 0); 366 DPRINTF(("genfs_can_mount %d\n", error)); 367 if (error) 368 return (error); 369 370 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 371 } 372 if (args->fspec == NULL) { 373 DPRINTF(("missing fspec\n")); 374 return EINVAL; 375 } 376 } 377 /* 378 * Not an update, or updating the name: look up the name 379 * and verify that it refers to a sensible block device. 380 */ 381 error = namei_simple_user(args->fspec, 382 NSM_FOLLOW_NOEMULROOT, &devvp); 383 if (error != 0) { 384 DPRINTF(("namei %d\n", error)); 385 return (error); 386 } 387 388 if (devvp->v_type != VBLK) { 389 DPRINTF(("not block\n")); 390 vrele(devvp); 391 return (ENOTBLK); 392 } 393 if (bdevsw_lookup(devvp->v_rdev) == NULL) { 394 DPRINTF(("no block switch\n")); 395 vrele(devvp); 396 return (ENXIO); 397 } 398 /* 399 * If mount by non-root, then verify that user has necessary 400 * permissions on the device. 401 */ 402 accessmode = VREAD; 403 if ((mp->mnt_flag & MNT_RDONLY) == 0) 404 accessmode |= VWRITE; 405 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 406 error = genfs_can_mount(devvp, accessmode, l->l_cred); 407 VOP_UNLOCK(devvp, 0); 408 if (error) { 409 DPRINTF(("genfs_can_mount %d\n", error)); 410 vrele(devvp); 411 return (error); 412 } 413 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 414 int xflags; 415 416 if (mp->mnt_flag & MNT_RDONLY) 417 xflags = FREAD; 418 else 419 xflags = FREAD|FWRITE; 420 error = VOP_OPEN(devvp, xflags, FSCRED); 421 if (error) { 422 DPRINTF(("VOP_OPEN %d\n", error)); 423 goto fail; 424 } 425 error = msdosfs_mountfs(devvp, mp, l, args); 426 if (error) { 427 DPRINTF(("msdosfs_mountfs %d\n", error)); 428 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 429 (void) VOP_CLOSE(devvp, xflags, NOCRED); 430 VOP_UNLOCK(devvp, 0); 431 goto fail; 432 } 433 #ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 434 pmp = VFSTOMSDOSFS(mp); 435 #endif 436 } else { 437 vrele(devvp); 438 if (devvp != pmp->pm_devvp) { 439 DPRINTF(("devvp %p pmp %p\n", 440 devvp, pmp->pm_devvp)); 441 return (EINVAL); /* needs translation */ 442 } 443 } 444 if ((error = update_mp(mp, args)) != 0) { 445 msdosfs_unmount(mp, MNT_FORCE); 446 DPRINTF(("update_mp %d\n", error)); 447 return error; 448 } 449 450 #ifdef MSDOSFS_DEBUG 451 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 452 #endif 453 return set_statvfs_info(path, UIO_USERSPACE, args->fspec, UIO_USERSPACE, 454 mp->mnt_op->vfs_name, mp, l); 455 456 fail: 457 vrele(devvp); 458 return (error); 459 } 460 461 int 462 msdosfs_mountfs(struct vnode *devvp, struct mount *mp, struct lwp *l, struct msdosfs_args *argp) 463 { 464 struct msdosfsmount *pmp; 465 struct buf *bp; 466 dev_t dev = devvp->v_rdev; 467 struct partinfo dpart; 468 union bootsector *bsp; 469 struct byte_bpb33 *b33; 470 struct byte_bpb50 *b50; 471 struct byte_bpb710 *b710; 472 u_int8_t SecPerClust; 473 int ronly, error, tmp; 474 int bsize, dtype, fstype, secsize; 475 u_int64_t psize; 476 477 /* Flush out any old buffers remaining from a previous use. */ 478 if ((error = vinvalbuf(devvp, V_SAVE, l->l_cred, l, 0, 0)) != 0) 479 return (error); 480 481 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 482 483 bp = NULL; /* both used in error_exit */ 484 pmp = NULL; 485 486 /* 487 * We need the disklabel to calculate the size of a FAT entry 488 * later on. Also make sure the partition contains a filesystem 489 * of type FS_MSDOS. This doesn't work for floppies, so we have 490 * to check for them too. 491 * 492 * There might still be parts of the msdos fs driver which assume 493 * that the size of a disk block will always be 512 bytes. 494 * Let's root them out... 495 */ 496 error = VOP_IOCTL(devvp, DIOCGPART, &dpart, FREAD, NOCRED); 497 if (error == 0) { 498 secsize = dpart.disklab->d_secsize; 499 dtype = dpart.disklab->d_type; 500 fstype = dpart.part->p_fstype; 501 psize = dpart.part->p_size; 502 } else { 503 struct dkwedge_info dkw; 504 error = VOP_IOCTL(devvp, DIOCGWEDGEINFO, &dkw, FREAD, NOCRED); 505 secsize = 512; /* XXX */ 506 dtype = DTYPE_FLOPPY; /* XXX */ 507 fstype = FS_MSDOS; 508 psize = -1; 509 if (error) { 510 if (error != ENOTTY) { 511 DPRINTF(("Error getting partition info %d\n", 512 error)); 513 goto error_exit; 514 } 515 } else { 516 fstype = strcmp(dkw.dkw_ptype, DKW_PTYPE_FAT) == 0 ? 517 FS_MSDOS : -1; 518 psize = dkw.dkw_size; 519 } 520 } 521 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 522 bsize = secsize; 523 if (bsize != 512) { 524 DPRINTF(("bsize %d dtype %d fstype %d\n", bsize, dtype, 525 fstype)); 526 error = EINVAL; 527 goto error_exit; 528 } 529 } else 530 bsize = 0; 531 532 /* 533 * Read the boot sector of the filesystem, and then check the 534 * boot signature. If not a dos boot sector then error out. 535 */ 536 if ((error = bread(devvp, 0, secsize, NOCRED, 0, &bp)) != 0) 537 goto error_exit; 538 bsp = (union bootsector *)bp->b_data; 539 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 540 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 541 b710 = (struct byte_bpb710 *)bsp->bs710.bsBPB; 542 543 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 544 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 545 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 546 DPRINTF(("bootsig0 %d bootsig1 %d\n", 547 bsp->bs50.bsBootSectSig0, 548 bsp->bs50.bsBootSectSig1)); 549 error = EINVAL; 550 goto error_exit; 551 } 552 } 553 554 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK); 555 memset(pmp, 0, sizeof *pmp); 556 pmp->pm_mountp = mp; 557 558 /* 559 * Compute several useful quantities from the bpb in the 560 * bootsector. Copy in the dos 5 variant of the bpb then fix up 561 * the fields that are different between dos 5 and dos 3.3. 562 */ 563 SecPerClust = b50->bpbSecPerClust; 564 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 565 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 566 pmp->pm_FATs = b50->bpbFATs; 567 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 568 pmp->pm_Sectors = getushort(b50->bpbSectors); 569 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 570 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 571 pmp->pm_Heads = getushort(b50->bpbHeads); 572 pmp->pm_Media = b50->bpbMedia; 573 574 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 575 /* XXX - We should probably check more values here */ 576 if (!pmp->pm_BytesPerSec || !SecPerClust 577 || pmp->pm_SecPerTrack > 63) { 578 DPRINTF(("bytespersec %d secperclust %d " 579 "secpertrack %d\n", 580 pmp->pm_BytesPerSec, SecPerClust, 581 pmp->pm_SecPerTrack)); 582 error = EINVAL; 583 goto error_exit; 584 } 585 } 586 587 if (pmp->pm_Sectors == 0) { 588 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 589 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 590 } else { 591 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 592 pmp->pm_HugeSectors = pmp->pm_Sectors; 593 } 594 595 if (pmp->pm_RootDirEnts == 0) { 596 unsigned short vers = getushort(b710->bpbFSVers); 597 /* 598 * Some say that bsBootSectSig[23] must be zero, but 599 * Windows does not require this and some digital cameras 600 * do not set these to zero. Therefore, do not insist. 601 */ 602 if (pmp->pm_Sectors || pmp->pm_FATsecs || vers) { 603 DPRINTF(("sectors %d fatsecs %lu vers %d\n", 604 pmp->pm_Sectors, pmp->pm_FATsecs, vers)); 605 error = EINVAL; 606 goto error_exit; 607 } 608 pmp->pm_fatmask = FAT32_MASK; 609 pmp->pm_fatmult = 4; 610 pmp->pm_fatdiv = 1; 611 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 612 613 /* mirrorring is enabled if the FATMIRROR bit is not set */ 614 if ((getushort(b710->bpbExtFlags) & FATMIRROR) == 0) 615 pmp->pm_flags |= MSDOSFS_FATMIRROR; 616 else 617 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 618 } else 619 pmp->pm_flags |= MSDOSFS_FATMIRROR; 620 621 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 622 if (FAT32(pmp)) { 623 DPRINTF(("fat32 for gemdos\n")); 624 /* 625 * GEMDOS doesn't know fat32. 626 */ 627 error = EINVAL; 628 goto error_exit; 629 } 630 631 /* 632 * Check a few values (could do some more): 633 * - logical sector size: power of 2, >= block size 634 * - sectors per cluster: power of 2, >= 1 635 * - number of sectors: >= 1, <= size of partition 636 */ 637 if ( (SecPerClust == 0) 638 || (SecPerClust & (SecPerClust - 1)) 639 || (pmp->pm_BytesPerSec < bsize) 640 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 641 || (pmp->pm_HugeSectors == 0) 642 || (pmp->pm_HugeSectors * (pmp->pm_BytesPerSec / bsize) 643 > psize)) { 644 DPRINTF(("consistency checks for gemdos\n")); 645 error = EINVAL; 646 goto error_exit; 647 } 648 /* 649 * XXX - Many parts of the msdos fs driver seem to assume that 650 * the number of bytes per logical sector (BytesPerSec) will 651 * always be the same as the number of bytes per disk block 652 * Let's pretend it is. 653 */ 654 tmp = pmp->pm_BytesPerSec / bsize; 655 pmp->pm_BytesPerSec = bsize; 656 pmp->pm_HugeSectors *= tmp; 657 pmp->pm_HiddenSects *= tmp; 658 pmp->pm_ResSectors *= tmp; 659 pmp->pm_Sectors *= tmp; 660 pmp->pm_FATsecs *= tmp; 661 SecPerClust *= tmp; 662 } 663 664 /* Check that fs has nonzero FAT size */ 665 if (pmp->pm_FATsecs == 0) { 666 DPRINTF(("FATsecs is 0\n")); 667 error = EINVAL; 668 goto error_exit; 669 } 670 671 pmp->pm_fatblk = pmp->pm_ResSectors; 672 if (FAT32(pmp)) { 673 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 674 pmp->pm_firstcluster = pmp->pm_fatblk 675 + (pmp->pm_FATs * pmp->pm_FATsecs); 676 pmp->pm_fsinfo = getushort(b710->bpbFSInfo); 677 } else { 678 pmp->pm_rootdirblk = pmp->pm_fatblk + 679 (pmp->pm_FATs * pmp->pm_FATsecs); 680 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 681 + pmp->pm_BytesPerSec - 1) 682 / pmp->pm_BytesPerSec;/* in sectors */ 683 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 684 } 685 686 pmp->pm_nmbrofclusters = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 687 SecPerClust; 688 pmp->pm_maxcluster = pmp->pm_nmbrofclusters + 1; 689 pmp->pm_fatsize = pmp->pm_FATsecs * pmp->pm_BytesPerSec; 690 691 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 692 if (pmp->pm_nmbrofclusters <= (0xff0 - 2) 693 && (dtype == DTYPE_FLOPPY 694 || (dtype == DTYPE_VND 695 && (pmp->pm_Heads == 1 || pmp->pm_Heads == 2))) 696 ) { 697 pmp->pm_fatmask = FAT12_MASK; 698 pmp->pm_fatmult = 3; 699 pmp->pm_fatdiv = 2; 700 } else { 701 pmp->pm_fatmask = FAT16_MASK; 702 pmp->pm_fatmult = 2; 703 pmp->pm_fatdiv = 1; 704 } 705 } else if (pmp->pm_fatmask == 0) { 706 if (pmp->pm_maxcluster 707 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 708 /* 709 * This will usually be a floppy disk. This size makes 710 * sure that one fat entry will not be split across 711 * multiple blocks. 712 */ 713 pmp->pm_fatmask = FAT12_MASK; 714 pmp->pm_fatmult = 3; 715 pmp->pm_fatdiv = 2; 716 } else { 717 pmp->pm_fatmask = FAT16_MASK; 718 pmp->pm_fatmult = 2; 719 pmp->pm_fatdiv = 1; 720 } 721 } 722 if (FAT12(pmp)) 723 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 724 else 725 pmp->pm_fatblocksize = MAXBSIZE; 726 727 pmp->pm_fatblocksec = pmp->pm_fatblocksize / pmp->pm_BytesPerSec; 728 pmp->pm_bnshift = ffs(pmp->pm_BytesPerSec) - 1; 729 730 /* 731 * Compute mask and shift value for isolating cluster relative byte 732 * offsets and cluster numbers from a file offset. 733 */ 734 pmp->pm_bpcluster = SecPerClust * pmp->pm_BytesPerSec; 735 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 736 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 737 738 /* 739 * Check for valid cluster size 740 * must be a power of 2 741 */ 742 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 743 DPRINTF(("bpcluster %lu cnshift %lu\n", 744 pmp->pm_bpcluster, pmp->pm_cnshift)); 745 error = EINVAL; 746 goto error_exit; 747 } 748 749 /* 750 * Release the bootsector buffer. 751 */ 752 brelse(bp, BC_AGE); 753 bp = NULL; 754 755 /* 756 * Check FSInfo. 757 */ 758 if (pmp->pm_fsinfo) { 759 struct fsinfo *fp; 760 761 /* 762 * XXX If the fsinfo block is stored on media with 763 * 2KB or larger sectors, is the fsinfo structure 764 * padded at the end or in the middle? 765 */ 766 if ((error = bread(devvp, de_bn2kb(pmp, pmp->pm_fsinfo), 767 pmp->pm_BytesPerSec, NOCRED, 0, &bp)) != 0) 768 goto error_exit; 769 fp = (struct fsinfo *)bp->b_data; 770 if (!memcmp(fp->fsisig1, "RRaA", 4) 771 && !memcmp(fp->fsisig2, "rrAa", 4) 772 && !memcmp(fp->fsisig3, "\0\0\125\252", 4) 773 && !memcmp(fp->fsisig4, "\0\0\125\252", 4)) 774 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 775 else 776 pmp->pm_fsinfo = 0; 777 brelse(bp, 0); 778 bp = NULL; 779 } 780 781 /* 782 * Check and validate (or perhaps invalidate?) the fsinfo structure? 783 * XXX 784 */ 785 if (pmp->pm_fsinfo) { 786 if (pmp->pm_nxtfree == (u_long)-1) 787 pmp->pm_fsinfo = 0; 788 } 789 790 /* 791 * Allocate memory for the bitmap of allocated clusters, and then 792 * fill it in. 793 */ 794 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 795 / N_INUSEBITS) 796 * sizeof(*pmp->pm_inusemap), 797 M_MSDOSFSFAT, M_WAITOK); 798 799 /* 800 * fillinusemap() needs pm_devvp. 801 */ 802 pmp->pm_dev = dev; 803 pmp->pm_devvp = devvp; 804 805 /* 806 * Have the inuse map filled in. 807 */ 808 if ((error = fillinusemap(pmp)) != 0) { 809 DPRINTF(("fillinusemap %d\n", error)); 810 goto error_exit; 811 } 812 813 /* 814 * If they want fat updates to be synchronous then let them suffer 815 * the performance degradation in exchange for the on disk copy of 816 * the fat being correct just about all the time. I suppose this 817 * would be a good thing to turn on if the kernel is still flakey. 818 */ 819 if (mp->mnt_flag & MNT_SYNCHRONOUS) 820 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 821 822 /* 823 * Finish up. 824 */ 825 if (ronly) 826 pmp->pm_flags |= MSDOSFSMNT_RONLY; 827 else 828 pmp->pm_fmod = 1; 829 mp->mnt_data = pmp; 830 mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev; 831 mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_MSDOS); 832 mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; 833 mp->mnt_stat.f_namemax = MSDOSFS_NAMEMAX(pmp); 834 mp->mnt_flag |= MNT_LOCAL; 835 mp->mnt_dev_bshift = pmp->pm_bnshift; 836 mp->mnt_fs_bshift = pmp->pm_cnshift; 837 838 /* 839 * If we ever do quotas for DOS filesystems this would be a place 840 * to fill in the info in the msdosfsmount structure. You dolt, 841 * quotas on dos filesystems make no sense because files have no 842 * owners on dos filesystems. of course there is some empty space 843 * in the directory entry where we could put uid's and gid's. 844 */ 845 846 devvp->v_specmountpoint = mp; 847 848 return (0); 849 850 error_exit:; 851 if (bp) 852 brelse(bp, BC_AGE); 853 if (pmp) { 854 if (pmp->pm_inusemap) 855 free(pmp->pm_inusemap, M_MSDOSFSFAT); 856 free(pmp, M_MSDOSFSMNT); 857 mp->mnt_data = NULL; 858 } 859 return (error); 860 } 861 862 int 863 msdosfs_start(struct mount *mp, int flags) 864 { 865 866 return (0); 867 } 868 869 /* 870 * Unmount the filesystem described by mp. 871 */ 872 int 873 msdosfs_unmount(struct mount *mp, int mntflags) 874 { 875 struct msdosfsmount *pmp; 876 int error, flags; 877 878 flags = 0; 879 if (mntflags & MNT_FORCE) 880 flags |= FORCECLOSE; 881 if ((error = vflush(mp, NULLVP, flags)) != 0) 882 return (error); 883 pmp = VFSTOMSDOSFS(mp); 884 if (pmp->pm_devvp->v_type != VBAD) 885 pmp->pm_devvp->v_specmountpoint = NULL; 886 #ifdef MSDOSFS_DEBUG 887 { 888 struct vnode *vp = pmp->pm_devvp; 889 890 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 891 printf("flag %08x, usecount %d, writecount %d, holdcnt %d\n", 892 vp->v_vflag | vp->v_iflag | vp->v_uflag, vp->v_usecount, 893 vp->v_writecount, vp->v_holdcnt); 894 printf("mount %p, op %p\n", 895 vp->v_mount, vp->v_op); 896 printf("freef %p, freeb %p, mount %p\n", 897 vp->v_freelist.tqe_next, vp->v_freelist.tqe_prev, 898 vp->v_mount); 899 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %d, type %d\n", 900 vp->v_cleanblkhd.lh_first, 901 vp->v_dirtyblkhd.lh_first, 902 vp->v_numoutput, vp->v_type); 903 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 904 vp->v_socket, vp->v_tag, 905 ((u_int *)vp->v_data)[0], 906 ((u_int *)vp->v_data)[1]); 907 } 908 #endif 909 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY); 910 error = VOP_CLOSE(pmp->pm_devvp, 911 pmp->pm_flags & MSDOSFSMNT_RONLY ? FREAD : FREAD|FWRITE, NOCRED); 912 vput(pmp->pm_devvp); 913 free(pmp->pm_inusemap, M_MSDOSFSFAT); 914 free(pmp, M_MSDOSFSMNT); 915 mp->mnt_data = NULL; 916 mp->mnt_flag &= ~MNT_LOCAL; 917 return (error); 918 } 919 920 int 921 msdosfs_root(struct mount *mp, struct vnode **vpp) 922 { 923 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 924 struct denode *ndep; 925 int error; 926 927 #ifdef MSDOSFS_DEBUG 928 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 929 #endif 930 if ((error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep)) != 0) 931 return (error); 932 *vpp = DETOV(ndep); 933 return (0); 934 } 935 936 int 937 msdosfs_statvfs(struct mount *mp, struct statvfs *sbp) 938 { 939 struct msdosfsmount *pmp; 940 941 pmp = VFSTOMSDOSFS(mp); 942 sbp->f_bsize = pmp->pm_bpcluster; 943 sbp->f_frsize = sbp->f_bsize; 944 sbp->f_iosize = pmp->pm_bpcluster; 945 sbp->f_blocks = pmp->pm_nmbrofclusters; 946 sbp->f_bfree = pmp->pm_freeclustercount; 947 sbp->f_bavail = pmp->pm_freeclustercount; 948 sbp->f_bresvd = 0; 949 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 950 sbp->f_ffree = 0; /* what to put in here? */ 951 sbp->f_favail = 0; /* what to put in here? */ 952 sbp->f_fresvd = 0; 953 copy_statvfs_info(sbp, mp); 954 return (0); 955 } 956 957 int 958 msdosfs_sync(struct mount *mp, int waitfor, kauth_cred_t cred) 959 { 960 struct vnode *vp, *mvp; 961 struct denode *dep; 962 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 963 int error, allerror = 0; 964 965 /* 966 * If we ever switch to not updating all of the fats all the time, 967 * this would be the place to update them from the first one. 968 */ 969 if (pmp->pm_fmod != 0) { 970 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 971 panic("msdosfs_sync: rofs mod"); 972 else { 973 /* update fats here */ 974 } 975 } 976 /* Allocate a marker vnode. */ 977 if ((mvp = vnalloc(mp)) == NULL) 978 return ENOMEM; 979 /* 980 * Write back each (modified) denode. 981 */ 982 mutex_enter(&mntvnode_lock); 983 loop: 984 for (vp = TAILQ_FIRST(&mp->mnt_vnodelist); vp; vp = vunmark(mvp)) { 985 vmark(mvp, vp); 986 if (vp->v_mount != mp || vismarker(vp)) 987 continue; 988 mutex_enter(&vp->v_interlock); 989 dep = VTODE(vp); 990 if (waitfor == MNT_LAZY || vp->v_type == VNON || 991 (((dep->de_flag & 992 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0) && 993 (LIST_EMPTY(&vp->v_dirtyblkhd) && 994 UVM_OBJ_IS_CLEAN(&vp->v_uobj)))) { 995 mutex_exit(&vp->v_interlock); 996 continue; 997 } 998 mutex_exit(&mntvnode_lock); 999 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK); 1000 if (error) { 1001 mutex_enter(&mntvnode_lock); 1002 if (error == ENOENT) { 1003 (void)vunmark(mvp); 1004 goto loop; 1005 } 1006 continue; 1007 } 1008 if ((error = VOP_FSYNC(vp, cred, 1009 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0)) != 0) 1010 allerror = error; 1011 vput(vp); 1012 mutex_enter(&mntvnode_lock); 1013 } 1014 mutex_exit(&mntvnode_lock); 1015 vnfree(mvp); 1016 1017 /* 1018 * Force stale file system control information to be flushed. 1019 */ 1020 if ((error = VOP_FSYNC(pmp->pm_devvp, cred, 1021 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0)) != 0) 1022 allerror = error; 1023 return (allerror); 1024 } 1025 1026 int 1027 msdosfs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) 1028 { 1029 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 1030 struct defid defh; 1031 struct denode *dep; 1032 int error; 1033 1034 if (fhp->fid_len != sizeof(struct defid)) { 1035 DPRINTF(("fid_len %d %zd\n", fhp->fid_len, 1036 sizeof(struct defid))); 1037 return EINVAL; 1038 } 1039 1040 memcpy(&defh, fhp, sizeof(defh)); 1041 error = deget(pmp, defh.defid_dirclust, defh.defid_dirofs, &dep); 1042 if (error) { 1043 DPRINTF(("deget %d\n", error)); 1044 *vpp = NULLVP; 1045 return (error); 1046 } 1047 *vpp = DETOV(dep); 1048 return (0); 1049 } 1050 1051 int 1052 msdosfs_vptofh(struct vnode *vp, struct fid *fhp, size_t *fh_size) 1053 { 1054 struct denode *dep; 1055 struct defid defh; 1056 1057 if (*fh_size < sizeof(struct defid)) { 1058 *fh_size = sizeof(struct defid); 1059 return E2BIG; 1060 } 1061 *fh_size = sizeof(struct defid); 1062 dep = VTODE(vp); 1063 memset(&defh, 0, sizeof(defh)); 1064 defh.defid_len = sizeof(struct defid); 1065 defh.defid_dirclust = dep->de_dirclust; 1066 defh.defid_dirofs = dep->de_diroffset; 1067 /* defh.defid_gen = dep->de_gen; */ 1068 memcpy(fhp, &defh, sizeof(defh)); 1069 return (0); 1070 } 1071 1072 int 1073 msdosfs_vget(struct mount *mp, ino_t ino, 1074 struct vnode **vpp) 1075 { 1076 1077 return (EOPNOTSUPP); 1078 } 1079