1 /* $NetBSD: msdosfs_vfsops.c,v 1.67 2008/05/16 09:21:59 hannken Exp $ */ 2 3 /*- 4 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. 5 * Copyright (C) 1994, 1995, 1997 TooLs GmbH. 6 * All rights reserved. 7 * Original code by Paul Popelka (paulp@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 1.67 2008/05/16 09:21:59 hannken 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 extern const struct vnodeopv_desc msdosfs_vnodeop_opv_desc; 113 114 const struct vnodeopv_desc * const msdosfs_vnodeopv_descs[] = { 115 &msdosfs_vnodeop_opv_desc, 116 NULL, 117 }; 118 119 struct vfsops msdosfs_vfsops = { 120 MOUNT_MSDOS, 121 sizeof (struct msdosfs_args), 122 msdosfs_mount, 123 msdosfs_start, 124 msdosfs_unmount, 125 msdosfs_root, 126 (void *)eopnotsupp, /* vfs_quotactl */ 127 msdosfs_statvfs, 128 msdosfs_sync, 129 msdosfs_vget, 130 msdosfs_fhtovp, 131 msdosfs_vptofh, 132 msdosfs_init, 133 msdosfs_reinit, 134 msdosfs_done, 135 msdosfs_mountroot, 136 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 137 vfs_stdextattrctl, 138 (void *)eopnotsupp, /* vfs_suspendctl */ 139 genfs_renamelock_enter, 140 genfs_renamelock_exit, 141 (void *)eopnotsupp, 142 msdosfs_vnodeopv_descs, 143 0, 144 { NULL, NULL }, 145 }; 146 147 static int 148 msdosfs_modcmd(modcmd_t cmd, void *arg) 149 { 150 151 switch (cmd) { 152 case MODULE_CMD_INIT: 153 return vfs_attach(&msdosfs_vfsops); 154 case MODULE_CMD_FINI: 155 return vfs_detach(&msdosfs_vfsops); 156 default: 157 return ENOTTY; 158 } 159 } 160 161 static int 162 update_mp(mp, argp) 163 struct mount *mp; 164 struct msdosfs_args *argp; 165 { 166 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 167 int error; 168 169 pmp->pm_gid = argp->gid; 170 pmp->pm_uid = argp->uid; 171 pmp->pm_mask = argp->mask & ALLPERMS; 172 pmp->pm_dirmask = argp->dirmask & ALLPERMS; 173 pmp->pm_gmtoff = argp->gmtoff; 174 pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT; 175 176 /* 177 * GEMDOS knows nothing (yet) about win95 178 */ 179 if (pmp->pm_flags & MSDOSFSMNT_GEMDOSFS) 180 pmp->pm_flags |= MSDOSFSMNT_NOWIN95; 181 182 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 183 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 184 else if (!(pmp->pm_flags & 185 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 186 struct vnode *rtvp; 187 188 /* 189 * Try to divine whether to support Win'95 long filenames 190 */ 191 if (FAT32(pmp)) 192 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 193 else { 194 if ((error = msdosfs_root(mp, &rtvp)) != 0) 195 return error; 196 pmp->pm_flags |= findwin95(VTODE(rtvp)) 197 ? MSDOSFSMNT_LONGNAME 198 : MSDOSFSMNT_SHORTNAME; 199 vput(rtvp); 200 } 201 } 202 203 mp->mnt_stat.f_namemax = MSDOSFS_NAMEMAX(pmp); 204 205 return 0; 206 } 207 208 int 209 msdosfs_mountroot() 210 { 211 struct mount *mp; 212 struct lwp *l = curlwp; /* XXX */ 213 int error; 214 struct msdosfs_args args; 215 216 if (device_class(root_device) != DV_DISK) 217 return (ENODEV); 218 219 if ((error = vfs_rootmountalloc(MOUNT_MSDOS, "root_device", &mp))) { 220 vrele(rootvp); 221 return (error); 222 } 223 224 args.flags = MSDOSFSMNT_VERSIONED; 225 args.uid = 0; 226 args.gid = 0; 227 args.mask = 0777; 228 args.version = MSDOSFSMNT_VERSION; 229 args.dirmask = 0777; 230 231 if ((error = msdosfs_mountfs(rootvp, mp, l, &args)) != 0) { 232 vfs_unbusy(mp, false, NULL); 233 vfs_destroy(mp); 234 return (error); 235 } 236 237 if ((error = update_mp(mp, &args)) != 0) { 238 (void)msdosfs_unmount(mp, 0); 239 vfs_unbusy(mp, false, NULL); 240 vfs_destroy(mp); 241 vrele(rootvp); 242 return (error); 243 } 244 245 mutex_enter(&mountlist_lock); 246 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 247 mutex_exit(&mountlist_lock); 248 (void)msdosfs_statvfs(mp, &mp->mnt_stat); 249 vfs_unbusy(mp, false, NULL); 250 return (0); 251 } 252 253 /* 254 * mp - path - addr in user space of mount point (ie /usr or whatever) 255 * data - addr in user space of mount params including the name of the block 256 * special file to treat as a filesystem. 257 */ 258 int 259 msdosfs_mount(mp, path, data, data_len) 260 struct mount *mp; 261 const char *path; 262 void *data; 263 size_t *data_len; 264 { 265 struct lwp *l = curlwp; 266 struct nameidata nd; 267 struct vnode *devvp; /* vnode for blk device to mount */ 268 struct msdosfs_args *args = data; /* holds data from mount request */ 269 /* msdosfs specific mount control block */ 270 struct msdosfsmount *pmp = NULL; 271 int error, flags; 272 mode_t accessmode; 273 274 if (*data_len < sizeof *args) 275 return EINVAL; 276 277 if (mp->mnt_flag & MNT_GETARGS) { 278 pmp = VFSTOMSDOSFS(mp); 279 if (pmp == NULL) 280 return EIO; 281 args->fspec = NULL; 282 args->uid = pmp->pm_uid; 283 args->gid = pmp->pm_gid; 284 args->mask = pmp->pm_mask; 285 args->flags = pmp->pm_flags; 286 args->version = MSDOSFSMNT_VERSION; 287 args->dirmask = pmp->pm_dirmask; 288 args->gmtoff = pmp->pm_gmtoff; 289 *data_len = sizeof *args; 290 return 0; 291 } 292 293 /* 294 * If not versioned (i.e. using old mount_msdos(8)), fill in 295 * the additional structure items with suitable defaults. 296 */ 297 if ((args->flags & MSDOSFSMNT_VERSIONED) == 0) { 298 args->version = 1; 299 args->dirmask = args->mask; 300 } 301 302 /* 303 * Reset GMT offset for pre-v3 mount structure args. 304 */ 305 if (args->version < 3) 306 args->gmtoff = 0; 307 308 /* 309 * If updating, check whether changing from read-only to 310 * read/write; if there is no device name, that's all we do. 311 */ 312 if (mp->mnt_flag & MNT_UPDATE) { 313 pmp = VFSTOMSDOSFS(mp); 314 error = 0; 315 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_RDONLY)) { 316 flags = WRITECLOSE; 317 if (mp->mnt_flag & MNT_FORCE) 318 flags |= FORCECLOSE; 319 error = vflush(mp, NULLVP, flags); 320 } 321 if (!error && (mp->mnt_flag & MNT_RELOAD)) 322 /* not yet implemented */ 323 error = EOPNOTSUPP; 324 if (error) { 325 DPRINTF(("vflush %d\n", error)); 326 return (error); 327 } 328 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_iflag & IMNT_WANTRDWR)) { 329 /* 330 * If upgrade to read-write by non-root, then verify 331 * that user has necessary permissions on the device. 332 */ 333 if (kauth_authorize_generic(l->l_cred, 334 KAUTH_GENERIC_ISSUSER, NULL) != 0) { 335 devvp = pmp->pm_devvp; 336 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 337 error = VOP_ACCESS(devvp, VREAD | VWRITE, 338 l->l_cred); 339 VOP_UNLOCK(devvp, 0); 340 DPRINTF(("VOP_ACCESS %d\n", error)); 341 if (error) 342 return (error); 343 } 344 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 345 } 346 if (args->fspec == NULL) { 347 DPRINTF(("missing fspec\n")); 348 return EINVAL; 349 } 350 } 351 /* 352 * Not an update, or updating the name: look up the name 353 * and verify that it refers to a sensible block device. 354 */ 355 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, args->fspec); 356 if ((error = namei(&nd)) != 0) { 357 DPRINTF(("namei %d\n", error)); 358 return (error); 359 } 360 devvp = nd.ni_vp; 361 362 if (devvp->v_type != VBLK) { 363 DPRINTF(("not block\n")); 364 vrele(devvp); 365 return (ENOTBLK); 366 } 367 if (bdevsw_lookup(devvp->v_rdev) == NULL) { 368 DPRINTF(("no block switch\n")); 369 vrele(devvp); 370 return (ENXIO); 371 } 372 /* 373 * If mount by non-root, then verify that user has necessary 374 * permissions on the device. 375 */ 376 if (kauth_authorize_generic(l->l_cred, KAUTH_GENERIC_ISSUSER, NULL) != 0) { 377 accessmode = VREAD; 378 if ((mp->mnt_flag & MNT_RDONLY) == 0) 379 accessmode |= VWRITE; 380 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 381 error = VOP_ACCESS(devvp, accessmode, l->l_cred); 382 VOP_UNLOCK(devvp, 0); 383 if (error) { 384 DPRINTF(("VOP_ACCESS2 %d\n", error)); 385 vrele(devvp); 386 return (error); 387 } 388 } 389 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 390 int xflags; 391 392 if (mp->mnt_flag & MNT_RDONLY) 393 xflags = FREAD; 394 else 395 xflags = FREAD|FWRITE; 396 error = VOP_OPEN(devvp, xflags, FSCRED); 397 if (error) { 398 DPRINTF(("VOP_OPEN %d\n", error)); 399 goto fail; 400 } 401 error = msdosfs_mountfs(devvp, mp, l, args); 402 if (error) { 403 DPRINTF(("msdosfs_mountfs %d\n", error)); 404 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 405 (void) VOP_CLOSE(devvp, xflags, NOCRED); 406 VOP_UNLOCK(devvp, 0); 407 goto fail; 408 } 409 #ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 410 pmp = VFSTOMSDOSFS(mp); 411 #endif 412 } else { 413 vrele(devvp); 414 if (devvp != pmp->pm_devvp) { 415 DPRINTF(("devvp %p pmp %p\n", 416 devvp, pmp->pm_devvp)); 417 return (EINVAL); /* needs translation */ 418 } 419 } 420 if ((error = update_mp(mp, args)) != 0) { 421 msdosfs_unmount(mp, MNT_FORCE); 422 DPRINTF(("update_mp %d\n", error)); 423 return error; 424 } 425 426 #ifdef MSDOSFS_DEBUG 427 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 428 #endif 429 return set_statvfs_info(path, UIO_USERSPACE, args->fspec, UIO_USERSPACE, 430 mp->mnt_op->vfs_name, mp, l); 431 432 fail: 433 vrele(devvp); 434 return (error); 435 } 436 437 int 438 msdosfs_mountfs(devvp, mp, l, argp) 439 struct vnode *devvp; 440 struct mount *mp; 441 struct lwp *l; 442 struct msdosfs_args *argp; 443 { 444 struct msdosfsmount *pmp; 445 struct buf *bp; 446 dev_t dev = devvp->v_rdev; 447 struct partinfo dpart; 448 union bootsector *bsp; 449 struct byte_bpb33 *b33; 450 struct byte_bpb50 *b50; 451 struct byte_bpb710 *b710; 452 u_int8_t SecPerClust; 453 int ronly, error, tmp; 454 int bsize, dtype, fstype, secsize; 455 u_int64_t psize; 456 457 /* Flush out any old buffers remaining from a previous use. */ 458 if ((error = vinvalbuf(devvp, V_SAVE, l->l_cred, l, 0, 0)) != 0) 459 return (error); 460 461 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 462 463 bp = NULL; /* both used in error_exit */ 464 pmp = NULL; 465 466 /* 467 * We need the disklabel to calculate the size of a FAT entry 468 * later on. Also make sure the partition contains a filesystem 469 * of type FS_MSDOS. This doesn't work for floppies, so we have 470 * to check for them too. 471 * 472 * There might still be parts of the msdos fs driver which assume 473 * that the size of a disk block will always be 512 bytes. 474 * Let's root them out... 475 */ 476 error = VOP_IOCTL(devvp, DIOCGPART, &dpart, FREAD, NOCRED); 477 if (error == 0) { 478 secsize = dpart.disklab->d_secsize; 479 dtype = dpart.disklab->d_type; 480 fstype = dpart.part->p_fstype; 481 psize = dpart.part->p_size; 482 } else { 483 struct dkwedge_info dkw; 484 error = VOP_IOCTL(devvp, DIOCGWEDGEINFO, &dkw, FREAD, NOCRED); 485 secsize = 512; /* XXX */ 486 dtype = DTYPE_FLOPPY; /* XXX */ 487 fstype = FS_MSDOS; 488 psize = -1; 489 if (error) { 490 if (error != ENOTTY) { 491 DPRINTF(("Error getting partition info %d\n", 492 error)); 493 goto error_exit; 494 } 495 } else { 496 fstype = strcmp(dkw.dkw_ptype, DKW_PTYPE_FAT) == 0 ? 497 FS_MSDOS : -1; 498 psize = dkw.dkw_size; 499 } 500 } 501 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 502 bsize = secsize; 503 if (bsize != 512 || 504 (dtype != DTYPE_FLOPPY && fstype != FS_MSDOS)) { 505 DPRINTF(("bsize %d dtype %d fstype %d\n", bsize, dtype, 506 fstype)); 507 error = EINVAL; 508 goto error_exit; 509 } 510 } else 511 bsize = 0; 512 513 /* 514 * Read the boot sector of the filesystem, and then check the 515 * boot signature. If not a dos boot sector then error out. 516 */ 517 if ((error = bread(devvp, 0, secsize, NOCRED, 0, &bp)) != 0) 518 goto error_exit; 519 bsp = (union bootsector *)bp->b_data; 520 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 521 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 522 b710 = (struct byte_bpb710 *)bsp->bs710.bsBPB; 523 524 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 525 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 526 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 527 DPRINTF(("bootsig0 %d bootsig1 %d\n", 528 bsp->bs50.bsBootSectSig0, 529 bsp->bs50.bsBootSectSig1)); 530 error = EINVAL; 531 goto error_exit; 532 } 533 } 534 535 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK); 536 memset(pmp, 0, sizeof *pmp); 537 pmp->pm_mountp = mp; 538 539 /* 540 * Compute several useful quantities from the bpb in the 541 * bootsector. Copy in the dos 5 variant of the bpb then fix up 542 * the fields that are different between dos 5 and dos 3.3. 543 */ 544 SecPerClust = b50->bpbSecPerClust; 545 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 546 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 547 pmp->pm_FATs = b50->bpbFATs; 548 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 549 pmp->pm_Sectors = getushort(b50->bpbSectors); 550 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 551 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 552 pmp->pm_Heads = getushort(b50->bpbHeads); 553 pmp->pm_Media = b50->bpbMedia; 554 555 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 556 /* XXX - We should probably check more values here */ 557 if (!pmp->pm_BytesPerSec || !SecPerClust 558 || pmp->pm_Heads > 255 || pmp->pm_SecPerTrack > 63) { 559 DPRINTF(("bytespersec %d secperclust %d " 560 "heads %d secpertrack %d\n", 561 pmp->pm_BytesPerSec, SecPerClust, 562 pmp->pm_Heads, pmp->pm_SecPerTrack)); 563 error = EINVAL; 564 goto error_exit; 565 } 566 } 567 568 if (pmp->pm_Sectors == 0) { 569 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 570 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 571 } else { 572 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 573 pmp->pm_HugeSectors = pmp->pm_Sectors; 574 } 575 576 if (pmp->pm_RootDirEnts == 0) { 577 unsigned short vers = getushort(b710->bpbFSVers); 578 /* 579 * Some say that bsBootSectSig[23] must be zero, but 580 * Windows does not require this and some digital cameras 581 * do not set these to zero. Therefore, do not insist. 582 */ 583 if (pmp->pm_Sectors || pmp->pm_FATsecs || vers) { 584 DPRINTF(("sectors %d fatsecs %lu vers %d\n", 585 pmp->pm_Sectors, pmp->pm_FATsecs, vers)); 586 error = EINVAL; 587 goto error_exit; 588 } 589 pmp->pm_fatmask = FAT32_MASK; 590 pmp->pm_fatmult = 4; 591 pmp->pm_fatdiv = 1; 592 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 593 594 /* mirrorring is enabled if the FATMIRROR bit is not set */ 595 if ((getushort(b710->bpbExtFlags) & FATMIRROR) == 0) 596 pmp->pm_flags |= MSDOSFS_FATMIRROR; 597 else 598 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 599 } else 600 pmp->pm_flags |= MSDOSFS_FATMIRROR; 601 602 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 603 if (FAT32(pmp)) { 604 DPRINTF(("fat32 for gemdos\n")); 605 /* 606 * GEMDOS doesn't know fat32. 607 */ 608 error = EINVAL; 609 goto error_exit; 610 } 611 612 /* 613 * Check a few values (could do some more): 614 * - logical sector size: power of 2, >= block size 615 * - sectors per cluster: power of 2, >= 1 616 * - number of sectors: >= 1, <= size of partition 617 */ 618 if ( (SecPerClust == 0) 619 || (SecPerClust & (SecPerClust - 1)) 620 || (pmp->pm_BytesPerSec < bsize) 621 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 622 || (pmp->pm_HugeSectors == 0) 623 || (pmp->pm_HugeSectors * (pmp->pm_BytesPerSec / bsize) 624 > psize)) { 625 DPRINTF(("consistency checks for gemdos\n")); 626 error = EINVAL; 627 goto error_exit; 628 } 629 /* 630 * XXX - Many parts of the msdos fs driver seem to assume that 631 * the number of bytes per logical sector (BytesPerSec) will 632 * always be the same as the number of bytes per disk block 633 * Let's pretend it is. 634 */ 635 tmp = pmp->pm_BytesPerSec / bsize; 636 pmp->pm_BytesPerSec = bsize; 637 pmp->pm_HugeSectors *= tmp; 638 pmp->pm_HiddenSects *= tmp; 639 pmp->pm_ResSectors *= tmp; 640 pmp->pm_Sectors *= tmp; 641 pmp->pm_FATsecs *= tmp; 642 SecPerClust *= tmp; 643 } 644 645 /* Check that fs has nonzero FAT size */ 646 if (pmp->pm_FATsecs == 0) { 647 DPRINTF(("FATsecs is 0\n")); 648 error = EINVAL; 649 goto error_exit; 650 } 651 652 pmp->pm_fatblk = pmp->pm_ResSectors; 653 if (FAT32(pmp)) { 654 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 655 pmp->pm_firstcluster = pmp->pm_fatblk 656 + (pmp->pm_FATs * pmp->pm_FATsecs); 657 pmp->pm_fsinfo = getushort(b710->bpbFSInfo); 658 } else { 659 pmp->pm_rootdirblk = pmp->pm_fatblk + 660 (pmp->pm_FATs * pmp->pm_FATsecs); 661 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 662 + pmp->pm_BytesPerSec - 1) 663 / pmp->pm_BytesPerSec;/* in sectors */ 664 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 665 } 666 667 pmp->pm_nmbrofclusters = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 668 SecPerClust; 669 pmp->pm_maxcluster = pmp->pm_nmbrofclusters + 1; 670 pmp->pm_fatsize = pmp->pm_FATsecs * pmp->pm_BytesPerSec; 671 672 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 673 if (pmp->pm_nmbrofclusters <= (0xff0 - 2) 674 && (dtype == DTYPE_FLOPPY 675 || (dtype == DTYPE_VND 676 && (pmp->pm_Heads == 1 || pmp->pm_Heads == 2))) 677 ) { 678 pmp->pm_fatmask = FAT12_MASK; 679 pmp->pm_fatmult = 3; 680 pmp->pm_fatdiv = 2; 681 } else { 682 pmp->pm_fatmask = FAT16_MASK; 683 pmp->pm_fatmult = 2; 684 pmp->pm_fatdiv = 1; 685 } 686 } else if (pmp->pm_fatmask == 0) { 687 if (pmp->pm_maxcluster 688 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 689 /* 690 * This will usually be a floppy disk. This size makes 691 * sure that one fat entry will not be split across 692 * multiple blocks. 693 */ 694 pmp->pm_fatmask = FAT12_MASK; 695 pmp->pm_fatmult = 3; 696 pmp->pm_fatdiv = 2; 697 } else { 698 pmp->pm_fatmask = FAT16_MASK; 699 pmp->pm_fatmult = 2; 700 pmp->pm_fatdiv = 1; 701 } 702 } 703 if (FAT12(pmp)) 704 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 705 else 706 pmp->pm_fatblocksize = MAXBSIZE; 707 708 pmp->pm_fatblocksec = pmp->pm_fatblocksize / pmp->pm_BytesPerSec; 709 pmp->pm_bnshift = ffs(pmp->pm_BytesPerSec) - 1; 710 711 /* 712 * Compute mask and shift value for isolating cluster relative byte 713 * offsets and cluster numbers from a file offset. 714 */ 715 pmp->pm_bpcluster = SecPerClust * pmp->pm_BytesPerSec; 716 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 717 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 718 719 /* 720 * Check for valid cluster size 721 * must be a power of 2 722 */ 723 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 724 DPRINTF(("bpcluster %lu cnshift %lu\n", 725 pmp->pm_bpcluster, pmp->pm_cnshift)); 726 error = EINVAL; 727 goto error_exit; 728 } 729 730 /* 731 * Release the bootsector buffer. 732 */ 733 brelse(bp, BC_AGE); 734 bp = NULL; 735 736 /* 737 * Check FSInfo. 738 */ 739 if (pmp->pm_fsinfo) { 740 struct fsinfo *fp; 741 742 /* 743 * XXX If the fsinfo block is stored on media with 744 * 2KB or larger sectors, is the fsinfo structure 745 * padded at the end or in the middle? 746 */ 747 if ((error = bread(devvp, de_bn2kb(pmp, pmp->pm_fsinfo), 748 pmp->pm_BytesPerSec, NOCRED, 0, &bp)) != 0) 749 goto error_exit; 750 fp = (struct fsinfo *)bp->b_data; 751 if (!memcmp(fp->fsisig1, "RRaA", 4) 752 && !memcmp(fp->fsisig2, "rrAa", 4) 753 && !memcmp(fp->fsisig3, "\0\0\125\252", 4) 754 && !memcmp(fp->fsisig4, "\0\0\125\252", 4)) 755 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 756 else 757 pmp->pm_fsinfo = 0; 758 brelse(bp, 0); 759 bp = NULL; 760 } 761 762 /* 763 * Check and validate (or perhaps invalidate?) the fsinfo structure? 764 * XXX 765 */ 766 if (pmp->pm_fsinfo) { 767 if (pmp->pm_nxtfree == (u_long)-1) 768 pmp->pm_fsinfo = 0; 769 } 770 771 /* 772 * Allocate memory for the bitmap of allocated clusters, and then 773 * fill it in. 774 */ 775 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 776 / N_INUSEBITS) 777 * sizeof(*pmp->pm_inusemap), 778 M_MSDOSFSFAT, M_WAITOK); 779 780 /* 781 * fillinusemap() needs pm_devvp. 782 */ 783 pmp->pm_dev = dev; 784 pmp->pm_devvp = devvp; 785 786 /* 787 * Have the inuse map filled in. 788 */ 789 if ((error = fillinusemap(pmp)) != 0) { 790 DPRINTF(("fillinusemap %d\n", error)); 791 goto error_exit; 792 } 793 794 /* 795 * If they want fat updates to be synchronous then let them suffer 796 * the performance degradation in exchange for the on disk copy of 797 * the fat being correct just about all the time. I suppose this 798 * would be a good thing to turn on if the kernel is still flakey. 799 */ 800 if (mp->mnt_flag & MNT_SYNCHRONOUS) 801 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 802 803 /* 804 * Finish up. 805 */ 806 if (ronly) 807 pmp->pm_flags |= MSDOSFSMNT_RONLY; 808 else 809 pmp->pm_fmod = 1; 810 mp->mnt_data = pmp; 811 mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev; 812 mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_MSDOS); 813 mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; 814 mp->mnt_stat.f_namemax = MSDOSFS_NAMEMAX(pmp); 815 mp->mnt_flag |= MNT_LOCAL; 816 mp->mnt_dev_bshift = pmp->pm_bnshift; 817 mp->mnt_fs_bshift = pmp->pm_cnshift; 818 819 #ifdef QUOTA 820 /* 821 * If we ever do quotas for DOS filesystems this would be a place 822 * to fill in the info in the msdosfsmount structure. You dolt, 823 * quotas on dos filesystems make no sense because files have no 824 * owners on dos filesystems. of course there is some empty space 825 * in the directory entry where we could put uid's and gid's. 826 */ 827 #endif 828 devvp->v_specmountpoint = mp; 829 830 return (0); 831 832 error_exit:; 833 if (bp) 834 brelse(bp, BC_AGE); 835 if (pmp) { 836 if (pmp->pm_inusemap) 837 free(pmp->pm_inusemap, M_MSDOSFSFAT); 838 free(pmp, M_MSDOSFSMNT); 839 mp->mnt_data = NULL; 840 } 841 return (error); 842 } 843 844 int 845 msdosfs_start(struct mount *mp, int flags) 846 { 847 848 return (0); 849 } 850 851 /* 852 * Unmount the filesystem described by mp. 853 */ 854 int 855 msdosfs_unmount(mp, mntflags) 856 struct mount *mp; 857 int mntflags; 858 { 859 struct msdosfsmount *pmp; 860 int error, flags; 861 862 flags = 0; 863 if (mntflags & MNT_FORCE) 864 flags |= FORCECLOSE; 865 #ifdef QUOTA 866 #endif 867 if ((error = vflush(mp, NULLVP, flags)) != 0) 868 return (error); 869 pmp = VFSTOMSDOSFS(mp); 870 if (pmp->pm_devvp->v_type != VBAD) 871 pmp->pm_devvp->v_specmountpoint = NULL; 872 #ifdef MSDOSFS_DEBUG 873 { 874 struct vnode *vp = pmp->pm_devvp; 875 876 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 877 printf("flag %08x, usecount %d, writecount %d, holdcnt %d\n", 878 vp->v_vflag | vp->v_iflag | vp->v_uflag, vp->v_usecount, 879 vp->v_writecount, vp->v_holdcnt); 880 printf("mount %p, op %p\n", 881 vp->v_mount, vp->v_op); 882 printf("freef %p, freeb %p, mount %p\n", 883 vp->v_freelist.tqe_next, vp->v_freelist.tqe_prev, 884 vp->v_mount); 885 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %d, type %d\n", 886 vp->v_cleanblkhd.lh_first, 887 vp->v_dirtyblkhd.lh_first, 888 vp->v_numoutput, vp->v_type); 889 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 890 vp->v_socket, vp->v_tag, 891 ((u_int *)vp->v_data)[0], 892 ((u_int *)vp->v_data)[1]); 893 } 894 #endif 895 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY); 896 error = VOP_CLOSE(pmp->pm_devvp, 897 pmp->pm_flags & MSDOSFSMNT_RONLY ? FREAD : FREAD|FWRITE, NOCRED); 898 vput(pmp->pm_devvp); 899 free(pmp->pm_inusemap, M_MSDOSFSFAT); 900 free(pmp, M_MSDOSFSMNT); 901 mp->mnt_data = NULL; 902 mp->mnt_flag &= ~MNT_LOCAL; 903 return (error); 904 } 905 906 int 907 msdosfs_root(mp, vpp) 908 struct mount *mp; 909 struct vnode **vpp; 910 { 911 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 912 struct denode *ndep; 913 int error; 914 915 #ifdef MSDOSFS_DEBUG 916 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 917 #endif 918 if ((error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep)) != 0) 919 return (error); 920 *vpp = DETOV(ndep); 921 return (0); 922 } 923 924 int 925 msdosfs_statvfs(struct mount *mp, struct statvfs *sbp) 926 { 927 struct msdosfsmount *pmp; 928 929 pmp = VFSTOMSDOSFS(mp); 930 sbp->f_bsize = pmp->pm_bpcluster; 931 sbp->f_frsize = sbp->f_bsize; 932 sbp->f_iosize = pmp->pm_bpcluster; 933 sbp->f_blocks = pmp->pm_nmbrofclusters; 934 sbp->f_bfree = pmp->pm_freeclustercount; 935 sbp->f_bavail = pmp->pm_freeclustercount; 936 sbp->f_bresvd = 0; 937 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 938 sbp->f_ffree = 0; /* what to put in here? */ 939 sbp->f_favail = 0; /* what to put in here? */ 940 sbp->f_fresvd = 0; 941 copy_statvfs_info(sbp, mp); 942 return (0); 943 } 944 945 int 946 msdosfs_sync(mp, waitfor, cred) 947 struct mount *mp; 948 int waitfor; 949 kauth_cred_t cred; 950 { 951 struct vnode *vp, *mvp; 952 struct denode *dep; 953 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 954 int error, allerror = 0; 955 956 /* 957 * If we ever switch to not updating all of the fats all the time, 958 * this would be the place to update them from the first one. 959 */ 960 if (pmp->pm_fmod != 0) { 961 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 962 panic("msdosfs_sync: rofs mod"); 963 else { 964 /* update fats here */ 965 } 966 } 967 /* Allocate a marker vnode. */ 968 if ((mvp = vnalloc(mp)) == NULL) 969 return ENOMEM; 970 /* 971 * Write back each (modified) denode. 972 */ 973 mutex_enter(&mntvnode_lock); 974 loop: 975 for (vp = TAILQ_FIRST(&mp->mnt_vnodelist); vp; vp = vunmark(mvp)) { 976 vmark(mvp, vp); 977 if (vp->v_mount != mp || vismarker(vp)) 978 continue; 979 mutex_enter(&vp->v_interlock); 980 dep = VTODE(vp); 981 if (waitfor == MNT_LAZY || vp->v_type == VNON || 982 (((dep->de_flag & 983 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0) && 984 (LIST_EMPTY(&vp->v_dirtyblkhd) && 985 UVM_OBJ_IS_CLEAN(&vp->v_uobj)))) { 986 mutex_exit(&vp->v_interlock); 987 continue; 988 } 989 mutex_exit(&mntvnode_lock); 990 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK); 991 if (error) { 992 mutex_enter(&mntvnode_lock); 993 if (error == ENOENT) { 994 (void)vunmark(mvp); 995 goto loop; 996 } 997 continue; 998 } 999 if ((error = VOP_FSYNC(vp, cred, 1000 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0)) != 0) 1001 allerror = error; 1002 vput(vp); 1003 mutex_enter(&mntvnode_lock); 1004 } 1005 mutex_exit(&mntvnode_lock); 1006 vnfree(mvp); 1007 1008 /* 1009 * Force stale file system control information to be flushed. 1010 */ 1011 if ((error = VOP_FSYNC(pmp->pm_devvp, cred, 1012 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0)) != 0) 1013 allerror = error; 1014 #ifdef QUOTA 1015 /* qsync(mp); */ 1016 #endif 1017 return (allerror); 1018 } 1019 1020 int 1021 msdosfs_fhtovp(mp, fhp, vpp) 1022 struct mount *mp; 1023 struct fid *fhp; 1024 struct vnode **vpp; 1025 { 1026 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 1027 struct defid defh; 1028 struct denode *dep; 1029 int error; 1030 1031 if (fhp->fid_len != sizeof(struct defid)) { 1032 DPRINTF(("fid_len %d %zd\n", fhp->fid_len, 1033 sizeof(struct defid))); 1034 return EINVAL; 1035 } 1036 1037 memcpy(&defh, fhp, sizeof(defh)); 1038 error = deget(pmp, defh.defid_dirclust, defh.defid_dirofs, &dep); 1039 if (error) { 1040 DPRINTF(("deget %d\n", error)); 1041 *vpp = NULLVP; 1042 return (error); 1043 } 1044 *vpp = DETOV(dep); 1045 return (0); 1046 } 1047 1048 int 1049 msdosfs_vptofh(vp, fhp, fh_size) 1050 struct vnode *vp; 1051 struct fid *fhp; 1052 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 1080 SYSCTL_SETUP(sysctl_vfs_msdosfs_setup, "sysctl vfs.msdosfs subtree setup") 1081 { 1082 1083 sysctl_createv(clog, 0, NULL, NULL, 1084 CTLFLAG_PERMANENT, 1085 CTLTYPE_NODE, "vfs", NULL, 1086 NULL, 0, NULL, 0, 1087 CTL_VFS, CTL_EOL); 1088 sysctl_createv(clog, 0, NULL, NULL, 1089 CTLFLAG_PERMANENT, 1090 CTLTYPE_NODE, "msdosfs", 1091 SYSCTL_DESCR("MS-DOS file system"), 1092 NULL, 0, NULL, 0, 1093 CTL_VFS, 4, CTL_EOL); 1094 /* 1095 * XXX the "4" above could be dynamic, thereby eliminating one 1096 * more instance of the "number to vfs" mapping problem, but 1097 * "4" is the order as taken from sys/mount.h 1098 */ 1099 } 1100