1 /* $NetBSD: msdosfs_vfsops.c,v 1.73 2009/03/15 17:15:57 cegger 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 1.73 2009/03/15 17:15:57 cegger Exp $"); 52 53 #if defined(_KERNEL_OPT) 54 #include "opt_compat_netbsd.h" 55 #endif 56 57 #include <sys/param.h> 58 #include <sys/systm.h> 59 #include <sys/sysctl.h> 60 #include <sys/namei.h> 61 #include <sys/proc.h> 62 #include <sys/kernel.h> 63 #include <sys/vnode.h> 64 #include <miscfs/genfs/genfs.h> 65 #include <miscfs/specfs/specdev.h> /* XXX */ /* defines v_rdev */ 66 #include <sys/mount.h> 67 #include <sys/buf.h> 68 #include <sys/file.h> 69 #include <sys/device.h> 70 #include <sys/disklabel.h> 71 #include <sys/disk.h> 72 #include <sys/ioctl.h> 73 #include <sys/malloc.h> 74 #include <sys/dirent.h> 75 #include <sys/stat.h> 76 #include <sys/conf.h> 77 #include <sys/kauth.h> 78 #include <sys/module.h> 79 80 #include <fs/msdosfs/bpb.h> 81 #include <fs/msdosfs/bootsect.h> 82 #include <fs/msdosfs/direntry.h> 83 #include <fs/msdosfs/denode.h> 84 #include <fs/msdosfs/msdosfsmount.h> 85 #include <fs/msdosfs/fat.h> 86 87 MODULE(MODULE_CLASS_VFS, msdosfs, NULL); 88 89 #ifdef MSDOSFS_DEBUG 90 #define DPRINTF(a) uprintf a 91 #else 92 #define DPRINTF(a) 93 #endif 94 95 #define MSDOSFS_NAMEMAX(pmp) \ 96 (pmp)->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12 97 98 VFS_PROTOS(msdosfs); 99 100 int msdosfs_mountfs(struct vnode *, struct mount *, struct lwp *, 101 struct msdosfs_args *); 102 103 static int update_mp(struct mount *, struct msdosfs_args *); 104 105 MALLOC_JUSTDEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOS FS mount structure"); 106 MALLOC_JUSTDEFINE(M_MSDOSFSFAT, "MSDOSFS fat", "MSDOS FS fat table"); 107 MALLOC_JUSTDEFINE(M_MSDOSFSTMP, "MSDOSFS temp", "MSDOS FS temp. structures"); 108 109 #define ROOTNAME "root_device" 110 111 static struct sysctllog *msdosfs_sysctl_log; 112 113 extern const struct vnodeopv_desc msdosfs_vnodeop_opv_desc; 114 115 const struct vnodeopv_desc * const msdosfs_vnodeopv_descs[] = { 116 &msdosfs_vnodeop_opv_desc, 117 NULL, 118 }; 119 120 struct vfsops msdosfs_vfsops = { 121 MOUNT_MSDOS, 122 sizeof (struct msdosfs_args), 123 msdosfs_mount, 124 msdosfs_start, 125 msdosfs_unmount, 126 msdosfs_root, 127 (void *)eopnotsupp, /* vfs_quotactl */ 128 msdosfs_statvfs, 129 msdosfs_sync, 130 msdosfs_vget, 131 msdosfs_fhtovp, 132 msdosfs_vptofh, 133 msdosfs_init, 134 msdosfs_reinit, 135 msdosfs_done, 136 msdosfs_mountroot, 137 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 138 vfs_stdextattrctl, 139 (void *)eopnotsupp, /* vfs_suspendctl */ 140 genfs_renamelock_enter, 141 genfs_renamelock_exit, 142 (void *)eopnotsupp, 143 msdosfs_vnodeopv_descs, 144 0, 145 { NULL, NULL }, 146 }; 147 148 static int 149 msdosfs_modcmd(modcmd_t cmd, void *arg) 150 { 151 int error; 152 153 switch (cmd) { 154 case MODULE_CMD_INIT: 155 error = vfs_attach(&msdosfs_vfsops); 156 if (error != 0) 157 break; 158 sysctl_createv(&msdosfs_sysctl_log, 0, NULL, NULL, 159 CTLFLAG_PERMANENT, 160 CTLTYPE_NODE, "vfs", NULL, 161 NULL, 0, NULL, 0, 162 CTL_VFS, CTL_EOL); 163 sysctl_createv(&msdosfs_sysctl_log, 0, NULL, NULL, 164 CTLFLAG_PERMANENT, 165 CTLTYPE_NODE, "msdosfs", 166 SYSCTL_DESCR("MS-DOS file system"), 167 NULL, 0, NULL, 0, 168 CTL_VFS, 4, CTL_EOL); 169 /* 170 * XXX the "4" above could be dynamic, thereby eliminating one 171 * more instance of the "number to vfs" mapping problem, but 172 * "4" is the order as taken from sys/mount.h 173 */ 174 break; 175 case MODULE_CMD_FINI: 176 error = vfs_detach(&msdosfs_vfsops); 177 if (error != 0) 178 break; 179 sysctl_teardown(&msdosfs_sysctl_log); 180 break; 181 default: 182 error = ENOTTY; 183 break; 184 } 185 186 return (error); 187 } 188 189 static int 190 update_mp(struct mount *mp, struct msdosfs_args *argp) 191 { 192 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 193 int error; 194 195 pmp->pm_gid = argp->gid; 196 pmp->pm_uid = argp->uid; 197 pmp->pm_mask = argp->mask & ALLPERMS; 198 pmp->pm_dirmask = argp->dirmask & ALLPERMS; 199 pmp->pm_gmtoff = argp->gmtoff; 200 pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT; 201 202 /* 203 * GEMDOS knows nothing about win95 long filenames 204 */ 205 if (pmp->pm_flags & MSDOSFSMNT_GEMDOSFS) 206 pmp->pm_flags |= MSDOSFSMNT_NOWIN95; 207 208 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 209 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 210 else if (!(pmp->pm_flags & 211 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 212 struct vnode *rtvp; 213 214 /* 215 * Try to divine whether to support Win'95 long filenames 216 */ 217 if (FAT32(pmp)) 218 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 219 else { 220 if ((error = msdosfs_root(mp, &rtvp)) != 0) 221 return error; 222 pmp->pm_flags |= findwin95(VTODE(rtvp)) 223 ? MSDOSFSMNT_LONGNAME 224 : MSDOSFSMNT_SHORTNAME; 225 vput(rtvp); 226 } 227 } 228 229 mp->mnt_stat.f_namemax = MSDOSFS_NAMEMAX(pmp); 230 231 return 0; 232 } 233 234 int 235 msdosfs_mountroot(void) 236 { 237 struct mount *mp; 238 struct lwp *l = curlwp; /* XXX */ 239 int error; 240 struct msdosfs_args args; 241 242 if (device_class(root_device) != DV_DISK) 243 return (ENODEV); 244 245 if ((error = vfs_rootmountalloc(MOUNT_MSDOS, "root_device", &mp))) { 246 vrele(rootvp); 247 return (error); 248 } 249 250 args.flags = MSDOSFSMNT_VERSIONED; 251 args.uid = 0; 252 args.gid = 0; 253 args.mask = 0777; 254 args.version = MSDOSFSMNT_VERSION; 255 args.dirmask = 0777; 256 257 if ((error = msdosfs_mountfs(rootvp, mp, l, &args)) != 0) { 258 vfs_unbusy(mp, false, NULL); 259 vfs_destroy(mp); 260 return (error); 261 } 262 263 if ((error = update_mp(mp, &args)) != 0) { 264 (void)msdosfs_unmount(mp, 0); 265 vfs_unbusy(mp, false, NULL); 266 vfs_destroy(mp); 267 vrele(rootvp); 268 return (error); 269 } 270 271 mutex_enter(&mountlist_lock); 272 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 273 mutex_exit(&mountlist_lock); 274 (void)msdosfs_statvfs(mp, &mp->mnt_stat); 275 vfs_unbusy(mp, false, NULL); 276 return (0); 277 } 278 279 /* 280 * mp - path - addr in user space of mount point (ie /usr or whatever) 281 * data - addr in user space of mount params including the name of the block 282 * special file to treat as a filesystem. 283 */ 284 int 285 msdosfs_mount(struct mount *mp, const char *path, void *data, size_t *data_len) 286 { 287 struct lwp *l = curlwp; 288 struct nameidata nd; 289 struct vnode *devvp; /* vnode for blk device to mount */ 290 struct msdosfs_args *args = data; /* holds data from mount request */ 291 /* msdosfs specific mount control block */ 292 struct msdosfsmount *pmp = NULL; 293 int error, flags; 294 mode_t accessmode; 295 296 if (*data_len < sizeof *args) 297 return EINVAL; 298 299 if (mp->mnt_flag & MNT_GETARGS) { 300 pmp = VFSTOMSDOSFS(mp); 301 if (pmp == NULL) 302 return EIO; 303 args->fspec = NULL; 304 args->uid = pmp->pm_uid; 305 args->gid = pmp->pm_gid; 306 args->mask = pmp->pm_mask; 307 args->flags = pmp->pm_flags; 308 args->version = MSDOSFSMNT_VERSION; 309 args->dirmask = pmp->pm_dirmask; 310 args->gmtoff = pmp->pm_gmtoff; 311 *data_len = sizeof *args; 312 return 0; 313 } 314 315 /* 316 * If not versioned (i.e. using old mount_msdos(8)), fill in 317 * the additional structure items with suitable defaults. 318 */ 319 if ((args->flags & MSDOSFSMNT_VERSIONED) == 0) { 320 args->version = 1; 321 args->dirmask = args->mask; 322 } 323 324 /* 325 * Reset GMT offset for pre-v3 mount structure args. 326 */ 327 if (args->version < 3) 328 args->gmtoff = 0; 329 330 /* 331 * If updating, check whether changing from read-only to 332 * read/write; if there is no device name, that's all we do. 333 */ 334 if (mp->mnt_flag & MNT_UPDATE) { 335 pmp = VFSTOMSDOSFS(mp); 336 error = 0; 337 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (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) && (mp->mnt_iflag & IMNT_WANTRDWR)) { 351 /* 352 * If upgrade to read-write by non-root, then verify 353 * that user has necessary permissions on the device. 354 */ 355 if (kauth_authorize_generic(l->l_cred, 356 KAUTH_GENERIC_ISSUSER, NULL) != 0) { 357 devvp = pmp->pm_devvp; 358 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 359 error = VOP_ACCESS(devvp, VREAD | VWRITE, 360 l->l_cred); 361 VOP_UNLOCK(devvp, 0); 362 DPRINTF(("VOP_ACCESS %d\n", error)); 363 if (error) 364 return (error); 365 } 366 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 367 } 368 if (args->fspec == NULL) { 369 DPRINTF(("missing fspec\n")); 370 return EINVAL; 371 } 372 } 373 /* 374 * Not an update, or updating the name: look up the name 375 * and verify that it refers to a sensible block device. 376 */ 377 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, args->fspec); 378 if ((error = namei(&nd)) != 0) { 379 DPRINTF(("namei %d\n", error)); 380 return (error); 381 } 382 devvp = nd.ni_vp; 383 384 if (devvp->v_type != VBLK) { 385 DPRINTF(("not block\n")); 386 vrele(devvp); 387 return (ENOTBLK); 388 } 389 if (bdevsw_lookup(devvp->v_rdev) == NULL) { 390 DPRINTF(("no block switch\n")); 391 vrele(devvp); 392 return (ENXIO); 393 } 394 /* 395 * If mount by non-root, then verify that user has necessary 396 * permissions on the device. 397 */ 398 if (kauth_authorize_generic(l->l_cred, KAUTH_GENERIC_ISSUSER, NULL) != 0) { 399 accessmode = VREAD; 400 if ((mp->mnt_flag & MNT_RDONLY) == 0) 401 accessmode |= VWRITE; 402 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 403 error = VOP_ACCESS(devvp, accessmode, l->l_cred); 404 VOP_UNLOCK(devvp, 0); 405 if (error) { 406 DPRINTF(("VOP_ACCESS2 %d\n", error)); 407 vrele(devvp); 408 return (error); 409 } 410 } 411 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 412 int xflags; 413 414 if (mp->mnt_flag & MNT_RDONLY) 415 xflags = FREAD; 416 else 417 xflags = FREAD|FWRITE; 418 error = VOP_OPEN(devvp, xflags, FSCRED); 419 if (error) { 420 DPRINTF(("VOP_OPEN %d\n", error)); 421 goto fail; 422 } 423 error = msdosfs_mountfs(devvp, mp, l, args); 424 if (error) { 425 DPRINTF(("msdosfs_mountfs %d\n", error)); 426 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 427 (void) VOP_CLOSE(devvp, xflags, NOCRED); 428 VOP_UNLOCK(devvp, 0); 429 goto fail; 430 } 431 #ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 432 pmp = VFSTOMSDOSFS(mp); 433 #endif 434 } else { 435 vrele(devvp); 436 if (devvp != pmp->pm_devvp) { 437 DPRINTF(("devvp %p pmp %p\n", 438 devvp, pmp->pm_devvp)); 439 return (EINVAL); /* needs translation */ 440 } 441 } 442 if ((error = update_mp(mp, args)) != 0) { 443 msdosfs_unmount(mp, MNT_FORCE); 444 DPRINTF(("update_mp %d\n", error)); 445 return error; 446 } 447 448 #ifdef MSDOSFS_DEBUG 449 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 450 #endif 451 return set_statvfs_info(path, UIO_USERSPACE, args->fspec, UIO_USERSPACE, 452 mp->mnt_op->vfs_name, mp, l); 453 454 fail: 455 vrele(devvp); 456 return (error); 457 } 458 459 int 460 msdosfs_mountfs(struct vnode *devvp, struct mount *mp, struct lwp *l, struct msdosfs_args *argp) 461 { 462 struct msdosfsmount *pmp; 463 struct buf *bp; 464 dev_t dev = devvp->v_rdev; 465 struct partinfo dpart; 466 union bootsector *bsp; 467 struct byte_bpb33 *b33; 468 struct byte_bpb50 *b50; 469 struct byte_bpb710 *b710; 470 u_int8_t SecPerClust; 471 int ronly, error, tmp; 472 int bsize, dtype, fstype, secsize; 473 u_int64_t psize; 474 475 /* Flush out any old buffers remaining from a previous use. */ 476 if ((error = vinvalbuf(devvp, V_SAVE, l->l_cred, l, 0, 0)) != 0) 477 return (error); 478 479 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 480 481 bp = NULL; /* both used in error_exit */ 482 pmp = NULL; 483 484 /* 485 * We need the disklabel to calculate the size of a FAT entry 486 * later on. Also make sure the partition contains a filesystem 487 * of type FS_MSDOS. This doesn't work for floppies, so we have 488 * to check for them too. 489 * 490 * There might still be parts of the msdos fs driver which assume 491 * that the size of a disk block will always be 512 bytes. 492 * Let's root them out... 493 */ 494 error = VOP_IOCTL(devvp, DIOCGPART, &dpart, FREAD, NOCRED); 495 if (error == 0) { 496 secsize = dpart.disklab->d_secsize; 497 dtype = dpart.disklab->d_type; 498 fstype = dpart.part->p_fstype; 499 psize = dpart.part->p_size; 500 } else { 501 struct dkwedge_info dkw; 502 error = VOP_IOCTL(devvp, DIOCGWEDGEINFO, &dkw, FREAD, NOCRED); 503 secsize = 512; /* XXX */ 504 dtype = DTYPE_FLOPPY; /* XXX */ 505 fstype = FS_MSDOS; 506 psize = -1; 507 if (error) { 508 if (error != ENOTTY) { 509 DPRINTF(("Error getting partition info %d\n", 510 error)); 511 goto error_exit; 512 } 513 } else { 514 fstype = strcmp(dkw.dkw_ptype, DKW_PTYPE_FAT) == 0 ? 515 FS_MSDOS : -1; 516 psize = dkw.dkw_size; 517 } 518 } 519 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 520 bsize = secsize; 521 if (bsize != 512) { 522 DPRINTF(("bsize %d dtype %d fstype %d\n", bsize, dtype, 523 fstype)); 524 error = EINVAL; 525 goto error_exit; 526 } 527 } else 528 bsize = 0; 529 530 /* 531 * Read the boot sector of the filesystem, and then check the 532 * boot signature. If not a dos boot sector then error out. 533 */ 534 if ((error = bread(devvp, 0, secsize, NOCRED, 0, &bp)) != 0) 535 goto error_exit; 536 bsp = (union bootsector *)bp->b_data; 537 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 538 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 539 b710 = (struct byte_bpb710 *)bsp->bs710.bsBPB; 540 541 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 542 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 543 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 544 DPRINTF(("bootsig0 %d bootsig1 %d\n", 545 bsp->bs50.bsBootSectSig0, 546 bsp->bs50.bsBootSectSig1)); 547 error = EINVAL; 548 goto error_exit; 549 } 550 } 551 552 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK); 553 memset(pmp, 0, sizeof *pmp); 554 pmp->pm_mountp = mp; 555 556 /* 557 * Compute several useful quantities from the bpb in the 558 * bootsector. Copy in the dos 5 variant of the bpb then fix up 559 * the fields that are different between dos 5 and dos 3.3. 560 */ 561 SecPerClust = b50->bpbSecPerClust; 562 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 563 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 564 pmp->pm_FATs = b50->bpbFATs; 565 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 566 pmp->pm_Sectors = getushort(b50->bpbSectors); 567 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 568 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 569 pmp->pm_Heads = getushort(b50->bpbHeads); 570 pmp->pm_Media = b50->bpbMedia; 571 572 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 573 /* XXX - We should probably check more values here */ 574 if (!pmp->pm_BytesPerSec || !SecPerClust 575 || pmp->pm_SecPerTrack > 63) { 576 DPRINTF(("bytespersec %d secperclust %d " 577 "secpertrack %d\n", 578 pmp->pm_BytesPerSec, SecPerClust, 579 pmp->pm_SecPerTrack)); 580 error = EINVAL; 581 goto error_exit; 582 } 583 } 584 585 if (pmp->pm_Sectors == 0) { 586 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 587 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 588 } else { 589 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 590 pmp->pm_HugeSectors = pmp->pm_Sectors; 591 } 592 593 if (pmp->pm_RootDirEnts == 0) { 594 unsigned short vers = getushort(b710->bpbFSVers); 595 /* 596 * Some say that bsBootSectSig[23] must be zero, but 597 * Windows does not require this and some digital cameras 598 * do not set these to zero. Therefore, do not insist. 599 */ 600 if (pmp->pm_Sectors || pmp->pm_FATsecs || vers) { 601 DPRINTF(("sectors %d fatsecs %lu vers %d\n", 602 pmp->pm_Sectors, pmp->pm_FATsecs, vers)); 603 error = EINVAL; 604 goto error_exit; 605 } 606 pmp->pm_fatmask = FAT32_MASK; 607 pmp->pm_fatmult = 4; 608 pmp->pm_fatdiv = 1; 609 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 610 611 /* mirrorring is enabled if the FATMIRROR bit is not set */ 612 if ((getushort(b710->bpbExtFlags) & FATMIRROR) == 0) 613 pmp->pm_flags |= MSDOSFS_FATMIRROR; 614 else 615 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 616 } else 617 pmp->pm_flags |= MSDOSFS_FATMIRROR; 618 619 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 620 if (FAT32(pmp)) { 621 DPRINTF(("fat32 for gemdos\n")); 622 /* 623 * GEMDOS doesn't know fat32. 624 */ 625 error = EINVAL; 626 goto error_exit; 627 } 628 629 /* 630 * Check a few values (could do some more): 631 * - logical sector size: power of 2, >= block size 632 * - sectors per cluster: power of 2, >= 1 633 * - number of sectors: >= 1, <= size of partition 634 */ 635 if ( (SecPerClust == 0) 636 || (SecPerClust & (SecPerClust - 1)) 637 || (pmp->pm_BytesPerSec < bsize) 638 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 639 || (pmp->pm_HugeSectors == 0) 640 || (pmp->pm_HugeSectors * (pmp->pm_BytesPerSec / bsize) 641 > psize)) { 642 DPRINTF(("consistency checks for gemdos\n")); 643 error = EINVAL; 644 goto error_exit; 645 } 646 /* 647 * XXX - Many parts of the msdos fs driver seem to assume that 648 * the number of bytes per logical sector (BytesPerSec) will 649 * always be the same as the number of bytes per disk block 650 * Let's pretend it is. 651 */ 652 tmp = pmp->pm_BytesPerSec / bsize; 653 pmp->pm_BytesPerSec = bsize; 654 pmp->pm_HugeSectors *= tmp; 655 pmp->pm_HiddenSects *= tmp; 656 pmp->pm_ResSectors *= tmp; 657 pmp->pm_Sectors *= tmp; 658 pmp->pm_FATsecs *= tmp; 659 SecPerClust *= tmp; 660 } 661 662 /* Check that fs has nonzero FAT size */ 663 if (pmp->pm_FATsecs == 0) { 664 DPRINTF(("FATsecs is 0\n")); 665 error = EINVAL; 666 goto error_exit; 667 } 668 669 pmp->pm_fatblk = pmp->pm_ResSectors; 670 if (FAT32(pmp)) { 671 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 672 pmp->pm_firstcluster = pmp->pm_fatblk 673 + (pmp->pm_FATs * pmp->pm_FATsecs); 674 pmp->pm_fsinfo = getushort(b710->bpbFSInfo); 675 } else { 676 pmp->pm_rootdirblk = pmp->pm_fatblk + 677 (pmp->pm_FATs * pmp->pm_FATsecs); 678 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 679 + pmp->pm_BytesPerSec - 1) 680 / pmp->pm_BytesPerSec;/* in sectors */ 681 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 682 } 683 684 pmp->pm_nmbrofclusters = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 685 SecPerClust; 686 pmp->pm_maxcluster = pmp->pm_nmbrofclusters + 1; 687 pmp->pm_fatsize = pmp->pm_FATsecs * pmp->pm_BytesPerSec; 688 689 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 690 if (pmp->pm_nmbrofclusters <= (0xff0 - 2) 691 && (dtype == DTYPE_FLOPPY 692 || (dtype == DTYPE_VND 693 && (pmp->pm_Heads == 1 || pmp->pm_Heads == 2))) 694 ) { 695 pmp->pm_fatmask = FAT12_MASK; 696 pmp->pm_fatmult = 3; 697 pmp->pm_fatdiv = 2; 698 } else { 699 pmp->pm_fatmask = FAT16_MASK; 700 pmp->pm_fatmult = 2; 701 pmp->pm_fatdiv = 1; 702 } 703 } else if (pmp->pm_fatmask == 0) { 704 if (pmp->pm_maxcluster 705 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 706 /* 707 * This will usually be a floppy disk. This size makes 708 * sure that one fat entry will not be split across 709 * multiple blocks. 710 */ 711 pmp->pm_fatmask = FAT12_MASK; 712 pmp->pm_fatmult = 3; 713 pmp->pm_fatdiv = 2; 714 } else { 715 pmp->pm_fatmask = FAT16_MASK; 716 pmp->pm_fatmult = 2; 717 pmp->pm_fatdiv = 1; 718 } 719 } 720 if (FAT12(pmp)) 721 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 722 else 723 pmp->pm_fatblocksize = MAXBSIZE; 724 725 pmp->pm_fatblocksec = pmp->pm_fatblocksize / pmp->pm_BytesPerSec; 726 pmp->pm_bnshift = ffs(pmp->pm_BytesPerSec) - 1; 727 728 /* 729 * Compute mask and shift value for isolating cluster relative byte 730 * offsets and cluster numbers from a file offset. 731 */ 732 pmp->pm_bpcluster = SecPerClust * pmp->pm_BytesPerSec; 733 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 734 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 735 736 /* 737 * Check for valid cluster size 738 * must be a power of 2 739 */ 740 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 741 DPRINTF(("bpcluster %lu cnshift %lu\n", 742 pmp->pm_bpcluster, pmp->pm_cnshift)); 743 error = EINVAL; 744 goto error_exit; 745 } 746 747 /* 748 * Release the bootsector buffer. 749 */ 750 brelse(bp, BC_AGE); 751 bp = NULL; 752 753 /* 754 * Check FSInfo. 755 */ 756 if (pmp->pm_fsinfo) { 757 struct fsinfo *fp; 758 759 /* 760 * XXX If the fsinfo block is stored on media with 761 * 2KB or larger sectors, is the fsinfo structure 762 * padded at the end or in the middle? 763 */ 764 if ((error = bread(devvp, de_bn2kb(pmp, pmp->pm_fsinfo), 765 pmp->pm_BytesPerSec, NOCRED, 0, &bp)) != 0) 766 goto error_exit; 767 fp = (struct fsinfo *)bp->b_data; 768 if (!memcmp(fp->fsisig1, "RRaA", 4) 769 && !memcmp(fp->fsisig2, "rrAa", 4) 770 && !memcmp(fp->fsisig3, "\0\0\125\252", 4) 771 && !memcmp(fp->fsisig4, "\0\0\125\252", 4)) 772 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 773 else 774 pmp->pm_fsinfo = 0; 775 brelse(bp, 0); 776 bp = NULL; 777 } 778 779 /* 780 * Check and validate (or perhaps invalidate?) the fsinfo structure? 781 * XXX 782 */ 783 if (pmp->pm_fsinfo) { 784 if (pmp->pm_nxtfree == (u_long)-1) 785 pmp->pm_fsinfo = 0; 786 } 787 788 /* 789 * Allocate memory for the bitmap of allocated clusters, and then 790 * fill it in. 791 */ 792 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 793 / N_INUSEBITS) 794 * sizeof(*pmp->pm_inusemap), 795 M_MSDOSFSFAT, M_WAITOK); 796 797 /* 798 * fillinusemap() needs pm_devvp. 799 */ 800 pmp->pm_dev = dev; 801 pmp->pm_devvp = devvp; 802 803 /* 804 * Have the inuse map filled in. 805 */ 806 if ((error = fillinusemap(pmp)) != 0) { 807 DPRINTF(("fillinusemap %d\n", error)); 808 goto error_exit; 809 } 810 811 /* 812 * If they want fat updates to be synchronous then let them suffer 813 * the performance degradation in exchange for the on disk copy of 814 * the fat being correct just about all the time. I suppose this 815 * would be a good thing to turn on if the kernel is still flakey. 816 */ 817 if (mp->mnt_flag & MNT_SYNCHRONOUS) 818 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 819 820 /* 821 * Finish up. 822 */ 823 if (ronly) 824 pmp->pm_flags |= MSDOSFSMNT_RONLY; 825 else 826 pmp->pm_fmod = 1; 827 mp->mnt_data = pmp; 828 mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev; 829 mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_MSDOS); 830 mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; 831 mp->mnt_stat.f_namemax = MSDOSFS_NAMEMAX(pmp); 832 mp->mnt_flag |= MNT_LOCAL; 833 mp->mnt_dev_bshift = pmp->pm_bnshift; 834 mp->mnt_fs_bshift = pmp->pm_cnshift; 835 836 /* 837 * If we ever do quotas for DOS filesystems this would be a place 838 * to fill in the info in the msdosfsmount structure. You dolt, 839 * quotas on dos filesystems make no sense because files have no 840 * owners on dos filesystems. of course there is some empty space 841 * in the directory entry where we could put uid's and gid's. 842 */ 843 844 devvp->v_specmountpoint = mp; 845 846 return (0); 847 848 error_exit:; 849 if (bp) 850 brelse(bp, BC_AGE); 851 if (pmp) { 852 if (pmp->pm_inusemap) 853 free(pmp->pm_inusemap, M_MSDOSFSFAT); 854 free(pmp, M_MSDOSFSMNT); 855 mp->mnt_data = NULL; 856 } 857 return (error); 858 } 859 860 int 861 msdosfs_start(struct mount *mp, int flags) 862 { 863 864 return (0); 865 } 866 867 /* 868 * Unmount the filesystem described by mp. 869 */ 870 int 871 msdosfs_unmount(struct mount *mp, int mntflags) 872 { 873 struct msdosfsmount *pmp; 874 int error, flags; 875 876 flags = 0; 877 if (mntflags & MNT_FORCE) 878 flags |= FORCECLOSE; 879 if ((error = vflush(mp, NULLVP, flags)) != 0) 880 return (error); 881 pmp = VFSTOMSDOSFS(mp); 882 if (pmp->pm_devvp->v_type != VBAD) 883 pmp->pm_devvp->v_specmountpoint = NULL; 884 #ifdef MSDOSFS_DEBUG 885 { 886 struct vnode *vp = pmp->pm_devvp; 887 888 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 889 printf("flag %08x, usecount %d, writecount %d, holdcnt %d\n", 890 vp->v_vflag | vp->v_iflag | vp->v_uflag, vp->v_usecount, 891 vp->v_writecount, vp->v_holdcnt); 892 printf("mount %p, op %p\n", 893 vp->v_mount, vp->v_op); 894 printf("freef %p, freeb %p, mount %p\n", 895 vp->v_freelist.tqe_next, vp->v_freelist.tqe_prev, 896 vp->v_mount); 897 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %d, type %d\n", 898 vp->v_cleanblkhd.lh_first, 899 vp->v_dirtyblkhd.lh_first, 900 vp->v_numoutput, vp->v_type); 901 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 902 vp->v_socket, vp->v_tag, 903 ((u_int *)vp->v_data)[0], 904 ((u_int *)vp->v_data)[1]); 905 } 906 #endif 907 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY); 908 error = VOP_CLOSE(pmp->pm_devvp, 909 pmp->pm_flags & MSDOSFSMNT_RONLY ? FREAD : FREAD|FWRITE, NOCRED); 910 vput(pmp->pm_devvp); 911 free(pmp->pm_inusemap, M_MSDOSFSFAT); 912 free(pmp, M_MSDOSFSMNT); 913 mp->mnt_data = NULL; 914 mp->mnt_flag &= ~MNT_LOCAL; 915 return (error); 916 } 917 918 int 919 msdosfs_root(struct mount *mp, struct vnode **vpp) 920 { 921 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 922 struct denode *ndep; 923 int error; 924 925 #ifdef MSDOSFS_DEBUG 926 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 927 #endif 928 if ((error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep)) != 0) 929 return (error); 930 *vpp = DETOV(ndep); 931 return (0); 932 } 933 934 int 935 msdosfs_statvfs(struct mount *mp, struct statvfs *sbp) 936 { 937 struct msdosfsmount *pmp; 938 939 pmp = VFSTOMSDOSFS(mp); 940 sbp->f_bsize = pmp->pm_bpcluster; 941 sbp->f_frsize = sbp->f_bsize; 942 sbp->f_iosize = pmp->pm_bpcluster; 943 sbp->f_blocks = pmp->pm_nmbrofclusters; 944 sbp->f_bfree = pmp->pm_freeclustercount; 945 sbp->f_bavail = pmp->pm_freeclustercount; 946 sbp->f_bresvd = 0; 947 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 948 sbp->f_ffree = 0; /* what to put in here? */ 949 sbp->f_favail = 0; /* what to put in here? */ 950 sbp->f_fresvd = 0; 951 copy_statvfs_info(sbp, mp); 952 return (0); 953 } 954 955 int 956 msdosfs_sync(struct mount *mp, int waitfor, kauth_cred_t cred) 957 { 958 struct vnode *vp, *mvp; 959 struct denode *dep; 960 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 961 int error, allerror = 0; 962 963 /* 964 * If we ever switch to not updating all of the fats all the time, 965 * this would be the place to update them from the first one. 966 */ 967 if (pmp->pm_fmod != 0) { 968 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 969 panic("msdosfs_sync: rofs mod"); 970 else { 971 /* update fats here */ 972 } 973 } 974 /* Allocate a marker vnode. */ 975 if ((mvp = vnalloc(mp)) == NULL) 976 return ENOMEM; 977 /* 978 * Write back each (modified) denode. 979 */ 980 mutex_enter(&mntvnode_lock); 981 loop: 982 for (vp = TAILQ_FIRST(&mp->mnt_vnodelist); vp; vp = vunmark(mvp)) { 983 vmark(mvp, vp); 984 if (vp->v_mount != mp || vismarker(vp)) 985 continue; 986 mutex_enter(&vp->v_interlock); 987 dep = VTODE(vp); 988 if (waitfor == MNT_LAZY || vp->v_type == VNON || 989 (((dep->de_flag & 990 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0) && 991 (LIST_EMPTY(&vp->v_dirtyblkhd) && 992 UVM_OBJ_IS_CLEAN(&vp->v_uobj)))) { 993 mutex_exit(&vp->v_interlock); 994 continue; 995 } 996 mutex_exit(&mntvnode_lock); 997 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK); 998 if (error) { 999 mutex_enter(&mntvnode_lock); 1000 if (error == ENOENT) { 1001 (void)vunmark(mvp); 1002 goto loop; 1003 } 1004 continue; 1005 } 1006 if ((error = VOP_FSYNC(vp, cred, 1007 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0)) != 0) 1008 allerror = error; 1009 vput(vp); 1010 mutex_enter(&mntvnode_lock); 1011 } 1012 mutex_exit(&mntvnode_lock); 1013 vnfree(mvp); 1014 1015 /* 1016 * Force stale file system control information to be flushed. 1017 */ 1018 if ((error = VOP_FSYNC(pmp->pm_devvp, cred, 1019 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0)) != 0) 1020 allerror = error; 1021 return (allerror); 1022 } 1023 1024 int 1025 msdosfs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) 1026 { 1027 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 1028 struct defid defh; 1029 struct denode *dep; 1030 int error; 1031 1032 if (fhp->fid_len != sizeof(struct defid)) { 1033 DPRINTF(("fid_len %d %zd\n", fhp->fid_len, 1034 sizeof(struct defid))); 1035 return EINVAL; 1036 } 1037 1038 memcpy(&defh, fhp, sizeof(defh)); 1039 error = deget(pmp, defh.defid_dirclust, defh.defid_dirofs, &dep); 1040 if (error) { 1041 DPRINTF(("deget %d\n", error)); 1042 *vpp = NULLVP; 1043 return (error); 1044 } 1045 *vpp = DETOV(dep); 1046 return (0); 1047 } 1048 1049 int 1050 msdosfs_vptofh(struct vnode *vp, struct fid *fhp, size_t *fh_size) 1051 { 1052 struct denode *dep; 1053 struct defid defh; 1054 1055 if (*fh_size < sizeof(struct defid)) { 1056 *fh_size = sizeof(struct defid); 1057 return E2BIG; 1058 } 1059 *fh_size = sizeof(struct defid); 1060 dep = VTODE(vp); 1061 memset(&defh, 0, sizeof(defh)); 1062 defh.defid_len = sizeof(struct defid); 1063 defh.defid_dirclust = dep->de_dirclust; 1064 defh.defid_dirofs = dep->de_diroffset; 1065 /* defh.defid_gen = dep->de_gen; */ 1066 memcpy(fhp, &defh, sizeof(defh)); 1067 return (0); 1068 } 1069 1070 int 1071 msdosfs_vget(struct mount *mp, ino_t ino, 1072 struct vnode **vpp) 1073 { 1074 1075 return (EOPNOTSUPP); 1076 } 1077