1 /* $NetBSD: msdosfs_vfsops.c,v 1.68 2008/06/28 01:34:05 rumble 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 1.68 2008/06/28 01:34:05 rumble Exp $"); 52 53 #if defined(_KERNEL_OPT) 54 #include "opt_quota.h" 55 #include "opt_compat_netbsd.h" 56 #endif 57 58 #include <sys/param.h> 59 #include <sys/systm.h> 60 #include <sys/sysctl.h> 61 #include <sys/namei.h> 62 #include <sys/proc.h> 63 #include <sys/kernel.h> 64 #include <sys/vnode.h> 65 #include <miscfs/genfs/genfs.h> 66 #include <miscfs/specfs/specdev.h> /* XXX */ /* defines v_rdev */ 67 #include <sys/mount.h> 68 #include <sys/buf.h> 69 #include <sys/file.h> 70 #include <sys/device.h> 71 #include <sys/disklabel.h> 72 #include <sys/disk.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, msdosfs, 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 (void *)eopnotsupp, /* vfs_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 msdosfs_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(mp, argp) 192 struct mount *mp; 193 struct msdosfs_args *argp; 194 { 195 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 196 int error; 197 198 pmp->pm_gid = argp->gid; 199 pmp->pm_uid = argp->uid; 200 pmp->pm_mask = argp->mask & ALLPERMS; 201 pmp->pm_dirmask = argp->dirmask & ALLPERMS; 202 pmp->pm_gmtoff = argp->gmtoff; 203 pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT; 204 205 /* 206 * GEMDOS knows nothing (yet) about win95 207 */ 208 if (pmp->pm_flags & MSDOSFSMNT_GEMDOSFS) 209 pmp->pm_flags |= MSDOSFSMNT_NOWIN95; 210 211 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 212 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 213 else if (!(pmp->pm_flags & 214 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 215 struct vnode *rtvp; 216 217 /* 218 * Try to divine whether to support Win'95 long filenames 219 */ 220 if (FAT32(pmp)) 221 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 222 else { 223 if ((error = msdosfs_root(mp, &rtvp)) != 0) 224 return error; 225 pmp->pm_flags |= findwin95(VTODE(rtvp)) 226 ? MSDOSFSMNT_LONGNAME 227 : MSDOSFSMNT_SHORTNAME; 228 vput(rtvp); 229 } 230 } 231 232 mp->mnt_stat.f_namemax = MSDOSFS_NAMEMAX(pmp); 233 234 return 0; 235 } 236 237 int 238 msdosfs_mountroot() 239 { 240 struct mount *mp; 241 struct lwp *l = curlwp; /* XXX */ 242 int error; 243 struct msdosfs_args args; 244 245 if (device_class(root_device) != DV_DISK) 246 return (ENODEV); 247 248 if ((error = vfs_rootmountalloc(MOUNT_MSDOS, "root_device", &mp))) { 249 vrele(rootvp); 250 return (error); 251 } 252 253 args.flags = MSDOSFSMNT_VERSIONED; 254 args.uid = 0; 255 args.gid = 0; 256 args.mask = 0777; 257 args.version = MSDOSFSMNT_VERSION; 258 args.dirmask = 0777; 259 260 if ((error = msdosfs_mountfs(rootvp, mp, l, &args)) != 0) { 261 vfs_unbusy(mp, false, NULL); 262 vfs_destroy(mp); 263 return (error); 264 } 265 266 if ((error = update_mp(mp, &args)) != 0) { 267 (void)msdosfs_unmount(mp, 0); 268 vfs_unbusy(mp, false, NULL); 269 vfs_destroy(mp); 270 vrele(rootvp); 271 return (error); 272 } 273 274 mutex_enter(&mountlist_lock); 275 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 276 mutex_exit(&mountlist_lock); 277 (void)msdosfs_statvfs(mp, &mp->mnt_stat); 278 vfs_unbusy(mp, false, NULL); 279 return (0); 280 } 281 282 /* 283 * mp - path - addr in user space of mount point (ie /usr or whatever) 284 * data - addr in user space of mount params including the name of the block 285 * special file to treat as a filesystem. 286 */ 287 int 288 msdosfs_mount(mp, path, data, data_len) 289 struct mount *mp; 290 const char *path; 291 void *data; 292 size_t *data_len; 293 { 294 struct lwp *l = curlwp; 295 struct nameidata nd; 296 struct vnode *devvp; /* vnode for blk device to mount */ 297 struct msdosfs_args *args = data; /* holds data from mount request */ 298 /* msdosfs specific mount control block */ 299 struct msdosfsmount *pmp = NULL; 300 int error, flags; 301 mode_t accessmode; 302 303 if (*data_len < sizeof *args) 304 return EINVAL; 305 306 if (mp->mnt_flag & MNT_GETARGS) { 307 pmp = VFSTOMSDOSFS(mp); 308 if (pmp == NULL) 309 return EIO; 310 args->fspec = NULL; 311 args->uid = pmp->pm_uid; 312 args->gid = pmp->pm_gid; 313 args->mask = pmp->pm_mask; 314 args->flags = pmp->pm_flags; 315 args->version = MSDOSFSMNT_VERSION; 316 args->dirmask = pmp->pm_dirmask; 317 args->gmtoff = pmp->pm_gmtoff; 318 *data_len = sizeof *args; 319 return 0; 320 } 321 322 /* 323 * If not versioned (i.e. using old mount_msdos(8)), fill in 324 * the additional structure items with suitable defaults. 325 */ 326 if ((args->flags & MSDOSFSMNT_VERSIONED) == 0) { 327 args->version = 1; 328 args->dirmask = args->mask; 329 } 330 331 /* 332 * Reset GMT offset for pre-v3 mount structure args. 333 */ 334 if (args->version < 3) 335 args->gmtoff = 0; 336 337 /* 338 * If updating, check whether changing from read-only to 339 * read/write; if there is no device name, that's all we do. 340 */ 341 if (mp->mnt_flag & MNT_UPDATE) { 342 pmp = VFSTOMSDOSFS(mp); 343 error = 0; 344 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_RDONLY)) { 345 flags = WRITECLOSE; 346 if (mp->mnt_flag & MNT_FORCE) 347 flags |= FORCECLOSE; 348 error = vflush(mp, NULLVP, flags); 349 } 350 if (!error && (mp->mnt_flag & MNT_RELOAD)) 351 /* not yet implemented */ 352 error = EOPNOTSUPP; 353 if (error) { 354 DPRINTF(("vflush %d\n", error)); 355 return (error); 356 } 357 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_iflag & IMNT_WANTRDWR)) { 358 /* 359 * If upgrade to read-write by non-root, then verify 360 * that user has necessary permissions on the device. 361 */ 362 if (kauth_authorize_generic(l->l_cred, 363 KAUTH_GENERIC_ISSUSER, NULL) != 0) { 364 devvp = pmp->pm_devvp; 365 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 366 error = VOP_ACCESS(devvp, VREAD | VWRITE, 367 l->l_cred); 368 VOP_UNLOCK(devvp, 0); 369 DPRINTF(("VOP_ACCESS %d\n", error)); 370 if (error) 371 return (error); 372 } 373 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 374 } 375 if (args->fspec == NULL) { 376 DPRINTF(("missing fspec\n")); 377 return EINVAL; 378 } 379 } 380 /* 381 * Not an update, or updating the name: look up the name 382 * and verify that it refers to a sensible block device. 383 */ 384 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, args->fspec); 385 if ((error = namei(&nd)) != 0) { 386 DPRINTF(("namei %d\n", error)); 387 return (error); 388 } 389 devvp = nd.ni_vp; 390 391 if (devvp->v_type != VBLK) { 392 DPRINTF(("not block\n")); 393 vrele(devvp); 394 return (ENOTBLK); 395 } 396 if (bdevsw_lookup(devvp->v_rdev) == NULL) { 397 DPRINTF(("no block switch\n")); 398 vrele(devvp); 399 return (ENXIO); 400 } 401 /* 402 * If mount by non-root, then verify that user has necessary 403 * permissions on the device. 404 */ 405 if (kauth_authorize_generic(l->l_cred, KAUTH_GENERIC_ISSUSER, NULL) != 0) { 406 accessmode = VREAD; 407 if ((mp->mnt_flag & MNT_RDONLY) == 0) 408 accessmode |= VWRITE; 409 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 410 error = VOP_ACCESS(devvp, accessmode, l->l_cred); 411 VOP_UNLOCK(devvp, 0); 412 if (error) { 413 DPRINTF(("VOP_ACCESS2 %d\n", error)); 414 vrele(devvp); 415 return (error); 416 } 417 } 418 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 419 int xflags; 420 421 if (mp->mnt_flag & MNT_RDONLY) 422 xflags = FREAD; 423 else 424 xflags = FREAD|FWRITE; 425 error = VOP_OPEN(devvp, xflags, FSCRED); 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, 0); 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(devvp, mp, l, argp) 468 struct vnode *devvp; 469 struct mount *mp; 470 struct lwp *l; 471 struct msdosfs_args *argp; 472 { 473 struct msdosfsmount *pmp; 474 struct buf *bp; 475 dev_t dev = devvp->v_rdev; 476 struct partinfo dpart; 477 union bootsector *bsp; 478 struct byte_bpb33 *b33; 479 struct byte_bpb50 *b50; 480 struct byte_bpb710 *b710; 481 u_int8_t SecPerClust; 482 int ronly, error, tmp; 483 int bsize, dtype, fstype, secsize; 484 u_int64_t psize; 485 486 /* Flush out any old buffers remaining from a previous use. */ 487 if ((error = vinvalbuf(devvp, V_SAVE, l->l_cred, l, 0, 0)) != 0) 488 return (error); 489 490 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 491 492 bp = NULL; /* both used in error_exit */ 493 pmp = NULL; 494 495 /* 496 * We need the disklabel to calculate the size of a FAT entry 497 * later on. Also make sure the partition contains a filesystem 498 * of type FS_MSDOS. This doesn't work for floppies, so we have 499 * to check for them too. 500 * 501 * There might still be parts of the msdos fs driver which assume 502 * that the size of a disk block will always be 512 bytes. 503 * Let's root them out... 504 */ 505 error = VOP_IOCTL(devvp, DIOCGPART, &dpart, FREAD, NOCRED); 506 if (error == 0) { 507 secsize = dpart.disklab->d_secsize; 508 dtype = dpart.disklab->d_type; 509 fstype = dpart.part->p_fstype; 510 psize = dpart.part->p_size; 511 } else { 512 struct dkwedge_info dkw; 513 error = VOP_IOCTL(devvp, DIOCGWEDGEINFO, &dkw, FREAD, NOCRED); 514 secsize = 512; /* XXX */ 515 dtype = DTYPE_FLOPPY; /* XXX */ 516 fstype = FS_MSDOS; 517 psize = -1; 518 if (error) { 519 if (error != ENOTTY) { 520 DPRINTF(("Error getting partition info %d\n", 521 error)); 522 goto error_exit; 523 } 524 } else { 525 fstype = strcmp(dkw.dkw_ptype, DKW_PTYPE_FAT) == 0 ? 526 FS_MSDOS : -1; 527 psize = dkw.dkw_size; 528 } 529 } 530 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 531 bsize = secsize; 532 if (bsize != 512 || 533 (dtype != DTYPE_FLOPPY && fstype != FS_MSDOS)) { 534 DPRINTF(("bsize %d dtype %d fstype %d\n", bsize, dtype, 535 fstype)); 536 error = EINVAL; 537 goto error_exit; 538 } 539 } else 540 bsize = 0; 541 542 /* 543 * Read the boot sector of the filesystem, and then check the 544 * boot signature. If not a dos boot sector then error out. 545 */ 546 if ((error = bread(devvp, 0, secsize, NOCRED, 0, &bp)) != 0) 547 goto error_exit; 548 bsp = (union bootsector *)bp->b_data; 549 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 550 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 551 b710 = (struct byte_bpb710 *)bsp->bs710.bsBPB; 552 553 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 554 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 555 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 556 DPRINTF(("bootsig0 %d bootsig1 %d\n", 557 bsp->bs50.bsBootSectSig0, 558 bsp->bs50.bsBootSectSig1)); 559 error = EINVAL; 560 goto error_exit; 561 } 562 } 563 564 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK); 565 memset(pmp, 0, sizeof *pmp); 566 pmp->pm_mountp = mp; 567 568 /* 569 * Compute several useful quantities from the bpb in the 570 * bootsector. Copy in the dos 5 variant of the bpb then fix up 571 * the fields that are different between dos 5 and dos 3.3. 572 */ 573 SecPerClust = b50->bpbSecPerClust; 574 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 575 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 576 pmp->pm_FATs = b50->bpbFATs; 577 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 578 pmp->pm_Sectors = getushort(b50->bpbSectors); 579 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 580 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 581 pmp->pm_Heads = getushort(b50->bpbHeads); 582 pmp->pm_Media = b50->bpbMedia; 583 584 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 585 /* XXX - We should probably check more values here */ 586 if (!pmp->pm_BytesPerSec || !SecPerClust 587 || pmp->pm_Heads > 255 || pmp->pm_SecPerTrack > 63) { 588 DPRINTF(("bytespersec %d secperclust %d " 589 "heads %d secpertrack %d\n", 590 pmp->pm_BytesPerSec, SecPerClust, 591 pmp->pm_Heads, pmp->pm_SecPerTrack)); 592 error = EINVAL; 593 goto error_exit; 594 } 595 } 596 597 if (pmp->pm_Sectors == 0) { 598 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 599 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 600 } else { 601 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 602 pmp->pm_HugeSectors = pmp->pm_Sectors; 603 } 604 605 if (pmp->pm_RootDirEnts == 0) { 606 unsigned short vers = getushort(b710->bpbFSVers); 607 /* 608 * Some say that bsBootSectSig[23] must be zero, but 609 * Windows does not require this and some digital cameras 610 * do not set these to zero. Therefore, do not insist. 611 */ 612 if (pmp->pm_Sectors || pmp->pm_FATsecs || vers) { 613 DPRINTF(("sectors %d fatsecs %lu vers %d\n", 614 pmp->pm_Sectors, pmp->pm_FATsecs, vers)); 615 error = EINVAL; 616 goto error_exit; 617 } 618 pmp->pm_fatmask = FAT32_MASK; 619 pmp->pm_fatmult = 4; 620 pmp->pm_fatdiv = 1; 621 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 622 623 /* mirrorring is enabled if the FATMIRROR bit is not set */ 624 if ((getushort(b710->bpbExtFlags) & FATMIRROR) == 0) 625 pmp->pm_flags |= MSDOSFS_FATMIRROR; 626 else 627 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 628 } else 629 pmp->pm_flags |= MSDOSFS_FATMIRROR; 630 631 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 632 if (FAT32(pmp)) { 633 DPRINTF(("fat32 for gemdos\n")); 634 /* 635 * GEMDOS doesn't know fat32. 636 */ 637 error = EINVAL; 638 goto error_exit; 639 } 640 641 /* 642 * Check a few values (could do some more): 643 * - logical sector size: power of 2, >= block size 644 * - sectors per cluster: power of 2, >= 1 645 * - number of sectors: >= 1, <= size of partition 646 */ 647 if ( (SecPerClust == 0) 648 || (SecPerClust & (SecPerClust - 1)) 649 || (pmp->pm_BytesPerSec < bsize) 650 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 651 || (pmp->pm_HugeSectors == 0) 652 || (pmp->pm_HugeSectors * (pmp->pm_BytesPerSec / bsize) 653 > psize)) { 654 DPRINTF(("consistency checks for gemdos\n")); 655 error = EINVAL; 656 goto error_exit; 657 } 658 /* 659 * XXX - Many parts of the msdos fs driver seem to assume that 660 * the number of bytes per logical sector (BytesPerSec) will 661 * always be the same as the number of bytes per disk block 662 * Let's pretend it is. 663 */ 664 tmp = pmp->pm_BytesPerSec / bsize; 665 pmp->pm_BytesPerSec = bsize; 666 pmp->pm_HugeSectors *= tmp; 667 pmp->pm_HiddenSects *= tmp; 668 pmp->pm_ResSectors *= tmp; 669 pmp->pm_Sectors *= tmp; 670 pmp->pm_FATsecs *= tmp; 671 SecPerClust *= tmp; 672 } 673 674 /* Check that fs has nonzero FAT size */ 675 if (pmp->pm_FATsecs == 0) { 676 DPRINTF(("FATsecs is 0\n")); 677 error = EINVAL; 678 goto error_exit; 679 } 680 681 pmp->pm_fatblk = pmp->pm_ResSectors; 682 if (FAT32(pmp)) { 683 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 684 pmp->pm_firstcluster = pmp->pm_fatblk 685 + (pmp->pm_FATs * pmp->pm_FATsecs); 686 pmp->pm_fsinfo = getushort(b710->bpbFSInfo); 687 } else { 688 pmp->pm_rootdirblk = pmp->pm_fatblk + 689 (pmp->pm_FATs * pmp->pm_FATsecs); 690 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 691 + pmp->pm_BytesPerSec - 1) 692 / pmp->pm_BytesPerSec;/* in sectors */ 693 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 694 } 695 696 pmp->pm_nmbrofclusters = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 697 SecPerClust; 698 pmp->pm_maxcluster = pmp->pm_nmbrofclusters + 1; 699 pmp->pm_fatsize = pmp->pm_FATsecs * pmp->pm_BytesPerSec; 700 701 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 702 if (pmp->pm_nmbrofclusters <= (0xff0 - 2) 703 && (dtype == DTYPE_FLOPPY 704 || (dtype == DTYPE_VND 705 && (pmp->pm_Heads == 1 || pmp->pm_Heads == 2))) 706 ) { 707 pmp->pm_fatmask = FAT12_MASK; 708 pmp->pm_fatmult = 3; 709 pmp->pm_fatdiv = 2; 710 } else { 711 pmp->pm_fatmask = FAT16_MASK; 712 pmp->pm_fatmult = 2; 713 pmp->pm_fatdiv = 1; 714 } 715 } else if (pmp->pm_fatmask == 0) { 716 if (pmp->pm_maxcluster 717 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 718 /* 719 * This will usually be a floppy disk. This size makes 720 * sure that one fat entry will not be split across 721 * multiple blocks. 722 */ 723 pmp->pm_fatmask = FAT12_MASK; 724 pmp->pm_fatmult = 3; 725 pmp->pm_fatdiv = 2; 726 } else { 727 pmp->pm_fatmask = FAT16_MASK; 728 pmp->pm_fatmult = 2; 729 pmp->pm_fatdiv = 1; 730 } 731 } 732 if (FAT12(pmp)) 733 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 734 else 735 pmp->pm_fatblocksize = MAXBSIZE; 736 737 pmp->pm_fatblocksec = pmp->pm_fatblocksize / pmp->pm_BytesPerSec; 738 pmp->pm_bnshift = ffs(pmp->pm_BytesPerSec) - 1; 739 740 /* 741 * Compute mask and shift value for isolating cluster relative byte 742 * offsets and cluster numbers from a file offset. 743 */ 744 pmp->pm_bpcluster = SecPerClust * pmp->pm_BytesPerSec; 745 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 746 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 747 748 /* 749 * Check for valid cluster size 750 * must be a power of 2 751 */ 752 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 753 DPRINTF(("bpcluster %lu cnshift %lu\n", 754 pmp->pm_bpcluster, pmp->pm_cnshift)); 755 error = EINVAL; 756 goto error_exit; 757 } 758 759 /* 760 * Release the bootsector buffer. 761 */ 762 brelse(bp, BC_AGE); 763 bp = NULL; 764 765 /* 766 * Check FSInfo. 767 */ 768 if (pmp->pm_fsinfo) { 769 struct fsinfo *fp; 770 771 /* 772 * XXX If the fsinfo block is stored on media with 773 * 2KB or larger sectors, is the fsinfo structure 774 * padded at the end or in the middle? 775 */ 776 if ((error = bread(devvp, de_bn2kb(pmp, pmp->pm_fsinfo), 777 pmp->pm_BytesPerSec, NOCRED, 0, &bp)) != 0) 778 goto error_exit; 779 fp = (struct fsinfo *)bp->b_data; 780 if (!memcmp(fp->fsisig1, "RRaA", 4) 781 && !memcmp(fp->fsisig2, "rrAa", 4) 782 && !memcmp(fp->fsisig3, "\0\0\125\252", 4) 783 && !memcmp(fp->fsisig4, "\0\0\125\252", 4)) 784 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 785 else 786 pmp->pm_fsinfo = 0; 787 brelse(bp, 0); 788 bp = NULL; 789 } 790 791 /* 792 * Check and validate (or perhaps invalidate?) the fsinfo structure? 793 * XXX 794 */ 795 if (pmp->pm_fsinfo) { 796 if (pmp->pm_nxtfree == (u_long)-1) 797 pmp->pm_fsinfo = 0; 798 } 799 800 /* 801 * Allocate memory for the bitmap of allocated clusters, and then 802 * fill it in. 803 */ 804 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 805 / N_INUSEBITS) 806 * sizeof(*pmp->pm_inusemap), 807 M_MSDOSFSFAT, M_WAITOK); 808 809 /* 810 * fillinusemap() needs pm_devvp. 811 */ 812 pmp->pm_dev = dev; 813 pmp->pm_devvp = devvp; 814 815 /* 816 * Have the inuse map filled in. 817 */ 818 if ((error = fillinusemap(pmp)) != 0) { 819 DPRINTF(("fillinusemap %d\n", error)); 820 goto error_exit; 821 } 822 823 /* 824 * If they want fat updates to be synchronous then let them suffer 825 * the performance degradation in exchange for the on disk copy of 826 * the fat being correct just about all the time. I suppose this 827 * would be a good thing to turn on if the kernel is still flakey. 828 */ 829 if (mp->mnt_flag & MNT_SYNCHRONOUS) 830 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 831 832 /* 833 * Finish up. 834 */ 835 if (ronly) 836 pmp->pm_flags |= MSDOSFSMNT_RONLY; 837 else 838 pmp->pm_fmod = 1; 839 mp->mnt_data = pmp; 840 mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev; 841 mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_MSDOS); 842 mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; 843 mp->mnt_stat.f_namemax = MSDOSFS_NAMEMAX(pmp); 844 mp->mnt_flag |= MNT_LOCAL; 845 mp->mnt_dev_bshift = pmp->pm_bnshift; 846 mp->mnt_fs_bshift = pmp->pm_cnshift; 847 848 #ifdef QUOTA 849 /* 850 * If we ever do quotas for DOS filesystems this would be a place 851 * to fill in the info in the msdosfsmount structure. You dolt, 852 * quotas on dos filesystems make no sense because files have no 853 * owners on dos filesystems. of course there is some empty space 854 * in the directory entry where we could put uid's and gid's. 855 */ 856 #endif 857 devvp->v_specmountpoint = mp; 858 859 return (0); 860 861 error_exit:; 862 if (bp) 863 brelse(bp, BC_AGE); 864 if (pmp) { 865 if (pmp->pm_inusemap) 866 free(pmp->pm_inusemap, M_MSDOSFSFAT); 867 free(pmp, M_MSDOSFSMNT); 868 mp->mnt_data = NULL; 869 } 870 return (error); 871 } 872 873 int 874 msdosfs_start(struct mount *mp, int flags) 875 { 876 877 return (0); 878 } 879 880 /* 881 * Unmount the filesystem described by mp. 882 */ 883 int 884 msdosfs_unmount(mp, mntflags) 885 struct mount *mp; 886 int mntflags; 887 { 888 struct msdosfsmount *pmp; 889 int error, flags; 890 891 flags = 0; 892 if (mntflags & MNT_FORCE) 893 flags |= FORCECLOSE; 894 #ifdef QUOTA 895 #endif 896 if ((error = vflush(mp, NULLVP, flags)) != 0) 897 return (error); 898 pmp = VFSTOMSDOSFS(mp); 899 if (pmp->pm_devvp->v_type != VBAD) 900 pmp->pm_devvp->v_specmountpoint = NULL; 901 #ifdef MSDOSFS_DEBUG 902 { 903 struct vnode *vp = pmp->pm_devvp; 904 905 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 906 printf("flag %08x, usecount %d, writecount %d, holdcnt %d\n", 907 vp->v_vflag | vp->v_iflag | vp->v_uflag, vp->v_usecount, 908 vp->v_writecount, vp->v_holdcnt); 909 printf("mount %p, op %p\n", 910 vp->v_mount, vp->v_op); 911 printf("freef %p, freeb %p, mount %p\n", 912 vp->v_freelist.tqe_next, vp->v_freelist.tqe_prev, 913 vp->v_mount); 914 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %d, type %d\n", 915 vp->v_cleanblkhd.lh_first, 916 vp->v_dirtyblkhd.lh_first, 917 vp->v_numoutput, vp->v_type); 918 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 919 vp->v_socket, vp->v_tag, 920 ((u_int *)vp->v_data)[0], 921 ((u_int *)vp->v_data)[1]); 922 } 923 #endif 924 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY); 925 error = VOP_CLOSE(pmp->pm_devvp, 926 pmp->pm_flags & MSDOSFSMNT_RONLY ? FREAD : FREAD|FWRITE, NOCRED); 927 vput(pmp->pm_devvp); 928 free(pmp->pm_inusemap, M_MSDOSFSFAT); 929 free(pmp, M_MSDOSFSMNT); 930 mp->mnt_data = NULL; 931 mp->mnt_flag &= ~MNT_LOCAL; 932 return (error); 933 } 934 935 int 936 msdosfs_root(mp, vpp) 937 struct mount *mp; 938 struct vnode **vpp; 939 { 940 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 941 struct denode *ndep; 942 int error; 943 944 #ifdef MSDOSFS_DEBUG 945 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 946 #endif 947 if ((error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep)) != 0) 948 return (error); 949 *vpp = DETOV(ndep); 950 return (0); 951 } 952 953 int 954 msdosfs_statvfs(struct mount *mp, struct statvfs *sbp) 955 { 956 struct msdosfsmount *pmp; 957 958 pmp = VFSTOMSDOSFS(mp); 959 sbp->f_bsize = pmp->pm_bpcluster; 960 sbp->f_frsize = sbp->f_bsize; 961 sbp->f_iosize = pmp->pm_bpcluster; 962 sbp->f_blocks = pmp->pm_nmbrofclusters; 963 sbp->f_bfree = pmp->pm_freeclustercount; 964 sbp->f_bavail = pmp->pm_freeclustercount; 965 sbp->f_bresvd = 0; 966 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 967 sbp->f_ffree = 0; /* what to put in here? */ 968 sbp->f_favail = 0; /* what to put in here? */ 969 sbp->f_fresvd = 0; 970 copy_statvfs_info(sbp, mp); 971 return (0); 972 } 973 974 int 975 msdosfs_sync(mp, waitfor, cred) 976 struct mount *mp; 977 int waitfor; 978 kauth_cred_t cred; 979 { 980 struct vnode *vp, *mvp; 981 struct denode *dep; 982 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 983 int error, allerror = 0; 984 985 /* 986 * If we ever switch to not updating all of the fats all the time, 987 * this would be the place to update them from the first one. 988 */ 989 if (pmp->pm_fmod != 0) { 990 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 991 panic("msdosfs_sync: rofs mod"); 992 else { 993 /* update fats here */ 994 } 995 } 996 /* Allocate a marker vnode. */ 997 if ((mvp = vnalloc(mp)) == NULL) 998 return ENOMEM; 999 /* 1000 * Write back each (modified) denode. 1001 */ 1002 mutex_enter(&mntvnode_lock); 1003 loop: 1004 for (vp = TAILQ_FIRST(&mp->mnt_vnodelist); vp; vp = vunmark(mvp)) { 1005 vmark(mvp, vp); 1006 if (vp->v_mount != mp || vismarker(vp)) 1007 continue; 1008 mutex_enter(&vp->v_interlock); 1009 dep = VTODE(vp); 1010 if (waitfor == MNT_LAZY || vp->v_type == VNON || 1011 (((dep->de_flag & 1012 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0) && 1013 (LIST_EMPTY(&vp->v_dirtyblkhd) && 1014 UVM_OBJ_IS_CLEAN(&vp->v_uobj)))) { 1015 mutex_exit(&vp->v_interlock); 1016 continue; 1017 } 1018 mutex_exit(&mntvnode_lock); 1019 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK); 1020 if (error) { 1021 mutex_enter(&mntvnode_lock); 1022 if (error == ENOENT) { 1023 (void)vunmark(mvp); 1024 goto loop; 1025 } 1026 continue; 1027 } 1028 if ((error = VOP_FSYNC(vp, cred, 1029 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0)) != 0) 1030 allerror = error; 1031 vput(vp); 1032 mutex_enter(&mntvnode_lock); 1033 } 1034 mutex_exit(&mntvnode_lock); 1035 vnfree(mvp); 1036 1037 /* 1038 * Force stale file system control information to be flushed. 1039 */ 1040 if ((error = VOP_FSYNC(pmp->pm_devvp, cred, 1041 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0)) != 0) 1042 allerror = error; 1043 #ifdef QUOTA 1044 /* qsync(mp); */ 1045 #endif 1046 return (allerror); 1047 } 1048 1049 int 1050 msdosfs_fhtovp(mp, fhp, vpp) 1051 struct mount *mp; 1052 struct fid *fhp; 1053 struct vnode **vpp; 1054 { 1055 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 1056 struct defid defh; 1057 struct denode *dep; 1058 int error; 1059 1060 if (fhp->fid_len != sizeof(struct defid)) { 1061 DPRINTF(("fid_len %d %zd\n", fhp->fid_len, 1062 sizeof(struct defid))); 1063 return EINVAL; 1064 } 1065 1066 memcpy(&defh, fhp, sizeof(defh)); 1067 error = deget(pmp, defh.defid_dirclust, defh.defid_dirofs, &dep); 1068 if (error) { 1069 DPRINTF(("deget %d\n", error)); 1070 *vpp = NULLVP; 1071 return (error); 1072 } 1073 *vpp = DETOV(dep); 1074 return (0); 1075 } 1076 1077 int 1078 msdosfs_vptofh(vp, fhp, fh_size) 1079 struct vnode *vp; 1080 struct fid *fhp; 1081 size_t *fh_size; 1082 { 1083 struct denode *dep; 1084 struct defid defh; 1085 1086 if (*fh_size < sizeof(struct defid)) { 1087 *fh_size = sizeof(struct defid); 1088 return E2BIG; 1089 } 1090 *fh_size = sizeof(struct defid); 1091 dep = VTODE(vp); 1092 memset(&defh, 0, sizeof(defh)); 1093 defh.defid_len = sizeof(struct defid); 1094 defh.defid_dirclust = dep->de_dirclust; 1095 defh.defid_dirofs = dep->de_diroffset; 1096 /* defh.defid_gen = dep->de_gen; */ 1097 memcpy(fhp, &defh, sizeof(defh)); 1098 return (0); 1099 } 1100 1101 int 1102 msdosfs_vget(struct mount *mp, ino_t ino, 1103 struct vnode **vpp) 1104 { 1105 1106 return (EOPNOTSUPP); 1107 } 1108