1 /* $NetBSD: msdosfs_vfsops.c,v 1.70 2008/12/26 03:38:52 jmcneill 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 1.70 2008/12/26 03:38:52 jmcneill 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(mp, argp) 191 struct mount *mp; 192 struct msdosfs_args *argp; 193 { 194 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 195 int error; 196 197 pmp->pm_gid = argp->gid; 198 pmp->pm_uid = argp->uid; 199 pmp->pm_mask = argp->mask & ALLPERMS; 200 pmp->pm_dirmask = argp->dirmask & ALLPERMS; 201 pmp->pm_gmtoff = argp->gmtoff; 202 pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT; 203 204 /* 205 * GEMDOS knows nothing (yet) about win95 206 */ 207 if (pmp->pm_flags & MSDOSFSMNT_GEMDOSFS) 208 pmp->pm_flags |= MSDOSFSMNT_NOWIN95; 209 210 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 211 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 212 else if (!(pmp->pm_flags & 213 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 214 struct vnode *rtvp; 215 216 /* 217 * Try to divine whether to support Win'95 long filenames 218 */ 219 if (FAT32(pmp)) 220 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 221 else { 222 if ((error = msdosfs_root(mp, &rtvp)) != 0) 223 return error; 224 pmp->pm_flags |= findwin95(VTODE(rtvp)) 225 ? MSDOSFSMNT_LONGNAME 226 : MSDOSFSMNT_SHORTNAME; 227 vput(rtvp); 228 } 229 } 230 231 mp->mnt_stat.f_namemax = MSDOSFS_NAMEMAX(pmp); 232 233 return 0; 234 } 235 236 int 237 msdosfs_mountroot() 238 { 239 struct mount *mp; 240 struct lwp *l = curlwp; /* XXX */ 241 int error; 242 struct msdosfs_args args; 243 244 if (device_class(root_device) != DV_DISK) 245 return (ENODEV); 246 247 if ((error = vfs_rootmountalloc(MOUNT_MSDOS, "root_device", &mp))) { 248 vrele(rootvp); 249 return (error); 250 } 251 252 args.flags = MSDOSFSMNT_VERSIONED; 253 args.uid = 0; 254 args.gid = 0; 255 args.mask = 0777; 256 args.version = MSDOSFSMNT_VERSION; 257 args.dirmask = 0777; 258 259 if ((error = msdosfs_mountfs(rootvp, mp, l, &args)) != 0) { 260 vfs_unbusy(mp, false, NULL); 261 vfs_destroy(mp); 262 return (error); 263 } 264 265 if ((error = update_mp(mp, &args)) != 0) { 266 (void)msdosfs_unmount(mp, 0); 267 vfs_unbusy(mp, false, NULL); 268 vfs_destroy(mp); 269 vrele(rootvp); 270 return (error); 271 } 272 273 mutex_enter(&mountlist_lock); 274 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 275 mutex_exit(&mountlist_lock); 276 (void)msdosfs_statvfs(mp, &mp->mnt_stat); 277 vfs_unbusy(mp, false, NULL); 278 return (0); 279 } 280 281 /* 282 * mp - path - addr in user space of mount point (ie /usr or whatever) 283 * data - addr in user space of mount params including the name of the block 284 * special file to treat as a filesystem. 285 */ 286 int 287 msdosfs_mount(mp, path, data, data_len) 288 struct mount *mp; 289 const char *path; 290 void *data; 291 size_t *data_len; 292 { 293 struct lwp *l = curlwp; 294 struct nameidata nd; 295 struct vnode *devvp; /* vnode for blk device to mount */ 296 struct msdosfs_args *args = data; /* holds data from mount request */ 297 /* msdosfs specific mount control block */ 298 struct msdosfsmount *pmp = NULL; 299 int error, flags; 300 mode_t accessmode; 301 302 if (*data_len < sizeof *args) 303 return EINVAL; 304 305 if (mp->mnt_flag & MNT_GETARGS) { 306 pmp = VFSTOMSDOSFS(mp); 307 if (pmp == NULL) 308 return EIO; 309 args->fspec = NULL; 310 args->uid = pmp->pm_uid; 311 args->gid = pmp->pm_gid; 312 args->mask = pmp->pm_mask; 313 args->flags = pmp->pm_flags; 314 args->version = MSDOSFSMNT_VERSION; 315 args->dirmask = pmp->pm_dirmask; 316 args->gmtoff = pmp->pm_gmtoff; 317 *data_len = sizeof *args; 318 return 0; 319 } 320 321 /* 322 * If not versioned (i.e. using old mount_msdos(8)), fill in 323 * the additional structure items with suitable defaults. 324 */ 325 if ((args->flags & MSDOSFSMNT_VERSIONED) == 0) { 326 args->version = 1; 327 args->dirmask = args->mask; 328 } 329 330 /* 331 * Reset GMT offset for pre-v3 mount structure args. 332 */ 333 if (args->version < 3) 334 args->gmtoff = 0; 335 336 /* 337 * If updating, check whether changing from read-only to 338 * read/write; if there is no device name, that's all we do. 339 */ 340 if (mp->mnt_flag & MNT_UPDATE) { 341 pmp = VFSTOMSDOSFS(mp); 342 error = 0; 343 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_RDONLY)) { 344 flags = WRITECLOSE; 345 if (mp->mnt_flag & MNT_FORCE) 346 flags |= FORCECLOSE; 347 error = vflush(mp, NULLVP, flags); 348 } 349 if (!error && (mp->mnt_flag & MNT_RELOAD)) 350 /* not yet implemented */ 351 error = EOPNOTSUPP; 352 if (error) { 353 DPRINTF(("vflush %d\n", error)); 354 return (error); 355 } 356 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_iflag & IMNT_WANTRDWR)) { 357 /* 358 * If upgrade to read-write by non-root, then verify 359 * that user has necessary permissions on the device. 360 */ 361 if (kauth_authorize_generic(l->l_cred, 362 KAUTH_GENERIC_ISSUSER, NULL) != 0) { 363 devvp = pmp->pm_devvp; 364 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 365 error = VOP_ACCESS(devvp, VREAD | VWRITE, 366 l->l_cred); 367 VOP_UNLOCK(devvp, 0); 368 DPRINTF(("VOP_ACCESS %d\n", error)); 369 if (error) 370 return (error); 371 } 372 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 373 } 374 if (args->fspec == NULL) { 375 DPRINTF(("missing fspec\n")); 376 return EINVAL; 377 } 378 } 379 /* 380 * Not an update, or updating the name: look up the name 381 * and verify that it refers to a sensible block device. 382 */ 383 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, args->fspec); 384 if ((error = namei(&nd)) != 0) { 385 DPRINTF(("namei %d\n", error)); 386 return (error); 387 } 388 devvp = nd.ni_vp; 389 390 if (devvp->v_type != VBLK) { 391 DPRINTF(("not block\n")); 392 vrele(devvp); 393 return (ENOTBLK); 394 } 395 if (bdevsw_lookup(devvp->v_rdev) == NULL) { 396 DPRINTF(("no block switch\n")); 397 vrele(devvp); 398 return (ENXIO); 399 } 400 /* 401 * If mount by non-root, then verify that user has necessary 402 * permissions on the device. 403 */ 404 if (kauth_authorize_generic(l->l_cred, KAUTH_GENERIC_ISSUSER, NULL) != 0) { 405 accessmode = VREAD; 406 if ((mp->mnt_flag & MNT_RDONLY) == 0) 407 accessmode |= VWRITE; 408 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 409 error = VOP_ACCESS(devvp, accessmode, l->l_cred); 410 VOP_UNLOCK(devvp, 0); 411 if (error) { 412 DPRINTF(("VOP_ACCESS2 %d\n", error)); 413 vrele(devvp); 414 return (error); 415 } 416 } 417 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 418 int xflags; 419 420 if (mp->mnt_flag & MNT_RDONLY) 421 xflags = FREAD; 422 else 423 xflags = FREAD|FWRITE; 424 error = VOP_OPEN(devvp, xflags, FSCRED); 425 if (error) { 426 DPRINTF(("VOP_OPEN %d\n", error)); 427 goto fail; 428 } 429 error = msdosfs_mountfs(devvp, mp, l, args); 430 if (error) { 431 DPRINTF(("msdosfs_mountfs %d\n", error)); 432 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 433 (void) VOP_CLOSE(devvp, xflags, NOCRED); 434 VOP_UNLOCK(devvp, 0); 435 goto fail; 436 } 437 #ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 438 pmp = VFSTOMSDOSFS(mp); 439 #endif 440 } else { 441 vrele(devvp); 442 if (devvp != pmp->pm_devvp) { 443 DPRINTF(("devvp %p pmp %p\n", 444 devvp, pmp->pm_devvp)); 445 return (EINVAL); /* needs translation */ 446 } 447 } 448 if ((error = update_mp(mp, args)) != 0) { 449 msdosfs_unmount(mp, MNT_FORCE); 450 DPRINTF(("update_mp %d\n", error)); 451 return error; 452 } 453 454 #ifdef MSDOSFS_DEBUG 455 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 456 #endif 457 return set_statvfs_info(path, UIO_USERSPACE, args->fspec, UIO_USERSPACE, 458 mp->mnt_op->vfs_name, mp, l); 459 460 fail: 461 vrele(devvp); 462 return (error); 463 } 464 465 int 466 msdosfs_mountfs(devvp, mp, l, argp) 467 struct vnode *devvp; 468 struct mount *mp; 469 struct lwp *l; 470 struct msdosfs_args *argp; 471 { 472 struct msdosfsmount *pmp; 473 struct buf *bp; 474 dev_t dev = devvp->v_rdev; 475 struct partinfo dpart; 476 union bootsector *bsp; 477 struct byte_bpb33 *b33; 478 struct byte_bpb50 *b50; 479 struct byte_bpb710 *b710; 480 u_int8_t SecPerClust; 481 int ronly, error, tmp; 482 int bsize, dtype, fstype, secsize; 483 u_int64_t psize; 484 485 /* Flush out any old buffers remaining from a previous use. */ 486 if ((error = vinvalbuf(devvp, V_SAVE, l->l_cred, l, 0, 0)) != 0) 487 return (error); 488 489 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 490 491 bp = NULL; /* both used in error_exit */ 492 pmp = NULL; 493 494 /* 495 * We need the disklabel to calculate the size of a FAT entry 496 * later on. Also make sure the partition contains a filesystem 497 * of type FS_MSDOS. This doesn't work for floppies, so we have 498 * to check for them too. 499 * 500 * There might still be parts of the msdos fs driver which assume 501 * that the size of a disk block will always be 512 bytes. 502 * Let's root them out... 503 */ 504 error = VOP_IOCTL(devvp, DIOCGPART, &dpart, FREAD, NOCRED); 505 if (error == 0) { 506 secsize = dpart.disklab->d_secsize; 507 dtype = dpart.disklab->d_type; 508 fstype = dpart.part->p_fstype; 509 psize = dpart.part->p_size; 510 } else { 511 struct dkwedge_info dkw; 512 error = VOP_IOCTL(devvp, DIOCGWEDGEINFO, &dkw, FREAD, NOCRED); 513 secsize = 512; /* XXX */ 514 dtype = DTYPE_FLOPPY; /* XXX */ 515 fstype = FS_MSDOS; 516 psize = -1; 517 if (error) { 518 if (error != ENOTTY) { 519 DPRINTF(("Error getting partition info %d\n", 520 error)); 521 goto error_exit; 522 } 523 } else { 524 fstype = strcmp(dkw.dkw_ptype, DKW_PTYPE_FAT) == 0 ? 525 FS_MSDOS : -1; 526 psize = dkw.dkw_size; 527 } 528 } 529 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 530 bsize = secsize; 531 if (bsize != 512 || 532 (dtype != DTYPE_FLOPPY && fstype != FS_MSDOS)) { 533 DPRINTF(("bsize %d dtype %d fstype %d\n", bsize, dtype, 534 fstype)); 535 error = EINVAL; 536 goto error_exit; 537 } 538 } else 539 bsize = 0; 540 541 /* 542 * Read the boot sector of the filesystem, and then check the 543 * boot signature. If not a dos boot sector then error out. 544 */ 545 if ((error = bread(devvp, 0, secsize, NOCRED, 0, &bp)) != 0) 546 goto error_exit; 547 bsp = (union bootsector *)bp->b_data; 548 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 549 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 550 b710 = (struct byte_bpb710 *)bsp->bs710.bsBPB; 551 552 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 553 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 554 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 555 DPRINTF(("bootsig0 %d bootsig1 %d\n", 556 bsp->bs50.bsBootSectSig0, 557 bsp->bs50.bsBootSectSig1)); 558 error = EINVAL; 559 goto error_exit; 560 } 561 } 562 563 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK); 564 memset(pmp, 0, sizeof *pmp); 565 pmp->pm_mountp = mp; 566 567 /* 568 * Compute several useful quantities from the bpb in the 569 * bootsector. Copy in the dos 5 variant of the bpb then fix up 570 * the fields that are different between dos 5 and dos 3.3. 571 */ 572 SecPerClust = b50->bpbSecPerClust; 573 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 574 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 575 pmp->pm_FATs = b50->bpbFATs; 576 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 577 pmp->pm_Sectors = getushort(b50->bpbSectors); 578 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 579 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 580 pmp->pm_Heads = getushort(b50->bpbHeads); 581 pmp->pm_Media = b50->bpbMedia; 582 583 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 584 /* XXX - We should probably check more values here */ 585 if (!pmp->pm_BytesPerSec || !SecPerClust 586 || pmp->pm_SecPerTrack > 63) { 587 DPRINTF(("bytespersec %d secperclust %d " 588 "secpertrack %d\n", 589 pmp->pm_BytesPerSec, SecPerClust, 590 pmp->pm_SecPerTrack)); 591 error = EINVAL; 592 goto error_exit; 593 } 594 } 595 596 if (pmp->pm_Sectors == 0) { 597 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 598 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 599 } else { 600 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 601 pmp->pm_HugeSectors = pmp->pm_Sectors; 602 } 603 604 if (pmp->pm_RootDirEnts == 0) { 605 unsigned short vers = getushort(b710->bpbFSVers); 606 /* 607 * Some say that bsBootSectSig[23] must be zero, but 608 * Windows does not require this and some digital cameras 609 * do not set these to zero. Therefore, do not insist. 610 */ 611 if (pmp->pm_Sectors || pmp->pm_FATsecs || vers) { 612 DPRINTF(("sectors %d fatsecs %lu vers %d\n", 613 pmp->pm_Sectors, pmp->pm_FATsecs, vers)); 614 error = EINVAL; 615 goto error_exit; 616 } 617 pmp->pm_fatmask = FAT32_MASK; 618 pmp->pm_fatmult = 4; 619 pmp->pm_fatdiv = 1; 620 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 621 622 /* mirrorring is enabled if the FATMIRROR bit is not set */ 623 if ((getushort(b710->bpbExtFlags) & FATMIRROR) == 0) 624 pmp->pm_flags |= MSDOSFS_FATMIRROR; 625 else 626 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 627 } else 628 pmp->pm_flags |= MSDOSFS_FATMIRROR; 629 630 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 631 if (FAT32(pmp)) { 632 DPRINTF(("fat32 for gemdos\n")); 633 /* 634 * GEMDOS doesn't know fat32. 635 */ 636 error = EINVAL; 637 goto error_exit; 638 } 639 640 /* 641 * Check a few values (could do some more): 642 * - logical sector size: power of 2, >= block size 643 * - sectors per cluster: power of 2, >= 1 644 * - number of sectors: >= 1, <= size of partition 645 */ 646 if ( (SecPerClust == 0) 647 || (SecPerClust & (SecPerClust - 1)) 648 || (pmp->pm_BytesPerSec < bsize) 649 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 650 || (pmp->pm_HugeSectors == 0) 651 || (pmp->pm_HugeSectors * (pmp->pm_BytesPerSec / bsize) 652 > psize)) { 653 DPRINTF(("consistency checks for gemdos\n")); 654 error = EINVAL; 655 goto error_exit; 656 } 657 /* 658 * XXX - Many parts of the msdos fs driver seem to assume that 659 * the number of bytes per logical sector (BytesPerSec) will 660 * always be the same as the number of bytes per disk block 661 * Let's pretend it is. 662 */ 663 tmp = pmp->pm_BytesPerSec / bsize; 664 pmp->pm_BytesPerSec = bsize; 665 pmp->pm_HugeSectors *= tmp; 666 pmp->pm_HiddenSects *= tmp; 667 pmp->pm_ResSectors *= tmp; 668 pmp->pm_Sectors *= tmp; 669 pmp->pm_FATsecs *= tmp; 670 SecPerClust *= tmp; 671 } 672 673 /* Check that fs has nonzero FAT size */ 674 if (pmp->pm_FATsecs == 0) { 675 DPRINTF(("FATsecs is 0\n")); 676 error = EINVAL; 677 goto error_exit; 678 } 679 680 pmp->pm_fatblk = pmp->pm_ResSectors; 681 if (FAT32(pmp)) { 682 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 683 pmp->pm_firstcluster = pmp->pm_fatblk 684 + (pmp->pm_FATs * pmp->pm_FATsecs); 685 pmp->pm_fsinfo = getushort(b710->bpbFSInfo); 686 } else { 687 pmp->pm_rootdirblk = pmp->pm_fatblk + 688 (pmp->pm_FATs * pmp->pm_FATsecs); 689 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 690 + pmp->pm_BytesPerSec - 1) 691 / pmp->pm_BytesPerSec;/* in sectors */ 692 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 693 } 694 695 pmp->pm_nmbrofclusters = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 696 SecPerClust; 697 pmp->pm_maxcluster = pmp->pm_nmbrofclusters + 1; 698 pmp->pm_fatsize = pmp->pm_FATsecs * pmp->pm_BytesPerSec; 699 700 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 701 if (pmp->pm_nmbrofclusters <= (0xff0 - 2) 702 && (dtype == DTYPE_FLOPPY 703 || (dtype == DTYPE_VND 704 && (pmp->pm_Heads == 1 || pmp->pm_Heads == 2))) 705 ) { 706 pmp->pm_fatmask = FAT12_MASK; 707 pmp->pm_fatmult = 3; 708 pmp->pm_fatdiv = 2; 709 } else { 710 pmp->pm_fatmask = FAT16_MASK; 711 pmp->pm_fatmult = 2; 712 pmp->pm_fatdiv = 1; 713 } 714 } else if (pmp->pm_fatmask == 0) { 715 if (pmp->pm_maxcluster 716 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 717 /* 718 * This will usually be a floppy disk. This size makes 719 * sure that one fat entry will not be split across 720 * multiple blocks. 721 */ 722 pmp->pm_fatmask = FAT12_MASK; 723 pmp->pm_fatmult = 3; 724 pmp->pm_fatdiv = 2; 725 } else { 726 pmp->pm_fatmask = FAT16_MASK; 727 pmp->pm_fatmult = 2; 728 pmp->pm_fatdiv = 1; 729 } 730 } 731 if (FAT12(pmp)) 732 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 733 else 734 pmp->pm_fatblocksize = MAXBSIZE; 735 736 pmp->pm_fatblocksec = pmp->pm_fatblocksize / pmp->pm_BytesPerSec; 737 pmp->pm_bnshift = ffs(pmp->pm_BytesPerSec) - 1; 738 739 /* 740 * Compute mask and shift value for isolating cluster relative byte 741 * offsets and cluster numbers from a file offset. 742 */ 743 pmp->pm_bpcluster = SecPerClust * pmp->pm_BytesPerSec; 744 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 745 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 746 747 /* 748 * Check for valid cluster size 749 * must be a power of 2 750 */ 751 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 752 DPRINTF(("bpcluster %lu cnshift %lu\n", 753 pmp->pm_bpcluster, pmp->pm_cnshift)); 754 error = EINVAL; 755 goto error_exit; 756 } 757 758 /* 759 * Release the bootsector buffer. 760 */ 761 brelse(bp, BC_AGE); 762 bp = NULL; 763 764 /* 765 * Check FSInfo. 766 */ 767 if (pmp->pm_fsinfo) { 768 struct fsinfo *fp; 769 770 /* 771 * XXX If the fsinfo block is stored on media with 772 * 2KB or larger sectors, is the fsinfo structure 773 * padded at the end or in the middle? 774 */ 775 if ((error = bread(devvp, de_bn2kb(pmp, pmp->pm_fsinfo), 776 pmp->pm_BytesPerSec, NOCRED, 0, &bp)) != 0) 777 goto error_exit; 778 fp = (struct fsinfo *)bp->b_data; 779 if (!memcmp(fp->fsisig1, "RRaA", 4) 780 && !memcmp(fp->fsisig2, "rrAa", 4) 781 && !memcmp(fp->fsisig3, "\0\0\125\252", 4) 782 && !memcmp(fp->fsisig4, "\0\0\125\252", 4)) 783 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 784 else 785 pmp->pm_fsinfo = 0; 786 brelse(bp, 0); 787 bp = NULL; 788 } 789 790 /* 791 * Check and validate (or perhaps invalidate?) the fsinfo structure? 792 * XXX 793 */ 794 if (pmp->pm_fsinfo) { 795 if (pmp->pm_nxtfree == (u_long)-1) 796 pmp->pm_fsinfo = 0; 797 } 798 799 /* 800 * Allocate memory for the bitmap of allocated clusters, and then 801 * fill it in. 802 */ 803 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 804 / N_INUSEBITS) 805 * sizeof(*pmp->pm_inusemap), 806 M_MSDOSFSFAT, M_WAITOK); 807 808 /* 809 * fillinusemap() needs pm_devvp. 810 */ 811 pmp->pm_dev = dev; 812 pmp->pm_devvp = devvp; 813 814 /* 815 * Have the inuse map filled in. 816 */ 817 if ((error = fillinusemap(pmp)) != 0) { 818 DPRINTF(("fillinusemap %d\n", error)); 819 goto error_exit; 820 } 821 822 /* 823 * If they want fat updates to be synchronous then let them suffer 824 * the performance degradation in exchange for the on disk copy of 825 * the fat being correct just about all the time. I suppose this 826 * would be a good thing to turn on if the kernel is still flakey. 827 */ 828 if (mp->mnt_flag & MNT_SYNCHRONOUS) 829 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 830 831 /* 832 * Finish up. 833 */ 834 if (ronly) 835 pmp->pm_flags |= MSDOSFSMNT_RONLY; 836 else 837 pmp->pm_fmod = 1; 838 mp->mnt_data = pmp; 839 mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev; 840 mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_MSDOS); 841 mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; 842 mp->mnt_stat.f_namemax = MSDOSFS_NAMEMAX(pmp); 843 mp->mnt_flag |= MNT_LOCAL; 844 mp->mnt_dev_bshift = pmp->pm_bnshift; 845 mp->mnt_fs_bshift = pmp->pm_cnshift; 846 847 /* 848 * If we ever do quotas for DOS filesystems this would be a place 849 * to fill in the info in the msdosfsmount structure. You dolt, 850 * quotas on dos filesystems make no sense because files have no 851 * owners on dos filesystems. of course there is some empty space 852 * in the directory entry where we could put uid's and gid's. 853 */ 854 855 devvp->v_specmountpoint = mp; 856 857 return (0); 858 859 error_exit:; 860 if (bp) 861 brelse(bp, BC_AGE); 862 if (pmp) { 863 if (pmp->pm_inusemap) 864 free(pmp->pm_inusemap, M_MSDOSFSFAT); 865 free(pmp, M_MSDOSFSMNT); 866 mp->mnt_data = NULL; 867 } 868 return (error); 869 } 870 871 int 872 msdosfs_start(struct mount *mp, int flags) 873 { 874 875 return (0); 876 } 877 878 /* 879 * Unmount the filesystem described by mp. 880 */ 881 int 882 msdosfs_unmount(mp, mntflags) 883 struct mount *mp; 884 int mntflags; 885 { 886 struct msdosfsmount *pmp; 887 int error, flags; 888 889 flags = 0; 890 if (mntflags & MNT_FORCE) 891 flags |= FORCECLOSE; 892 if ((error = vflush(mp, NULLVP, flags)) != 0) 893 return (error); 894 pmp = VFSTOMSDOSFS(mp); 895 if (pmp->pm_devvp->v_type != VBAD) 896 pmp->pm_devvp->v_specmountpoint = NULL; 897 #ifdef MSDOSFS_DEBUG 898 { 899 struct vnode *vp = pmp->pm_devvp; 900 901 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 902 printf("flag %08x, usecount %d, writecount %d, holdcnt %d\n", 903 vp->v_vflag | vp->v_iflag | vp->v_uflag, vp->v_usecount, 904 vp->v_writecount, vp->v_holdcnt); 905 printf("mount %p, op %p\n", 906 vp->v_mount, vp->v_op); 907 printf("freef %p, freeb %p, mount %p\n", 908 vp->v_freelist.tqe_next, vp->v_freelist.tqe_prev, 909 vp->v_mount); 910 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %d, type %d\n", 911 vp->v_cleanblkhd.lh_first, 912 vp->v_dirtyblkhd.lh_first, 913 vp->v_numoutput, vp->v_type); 914 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 915 vp->v_socket, vp->v_tag, 916 ((u_int *)vp->v_data)[0], 917 ((u_int *)vp->v_data)[1]); 918 } 919 #endif 920 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY); 921 error = VOP_CLOSE(pmp->pm_devvp, 922 pmp->pm_flags & MSDOSFSMNT_RONLY ? FREAD : FREAD|FWRITE, NOCRED); 923 vput(pmp->pm_devvp); 924 free(pmp->pm_inusemap, M_MSDOSFSFAT); 925 free(pmp, M_MSDOSFSMNT); 926 mp->mnt_data = NULL; 927 mp->mnt_flag &= ~MNT_LOCAL; 928 return (error); 929 } 930 931 int 932 msdosfs_root(mp, vpp) 933 struct mount *mp; 934 struct vnode **vpp; 935 { 936 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 937 struct denode *ndep; 938 int error; 939 940 #ifdef MSDOSFS_DEBUG 941 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 942 #endif 943 if ((error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep)) != 0) 944 return (error); 945 *vpp = DETOV(ndep); 946 return (0); 947 } 948 949 int 950 msdosfs_statvfs(struct mount *mp, struct statvfs *sbp) 951 { 952 struct msdosfsmount *pmp; 953 954 pmp = VFSTOMSDOSFS(mp); 955 sbp->f_bsize = pmp->pm_bpcluster; 956 sbp->f_frsize = sbp->f_bsize; 957 sbp->f_iosize = pmp->pm_bpcluster; 958 sbp->f_blocks = pmp->pm_nmbrofclusters; 959 sbp->f_bfree = pmp->pm_freeclustercount; 960 sbp->f_bavail = pmp->pm_freeclustercount; 961 sbp->f_bresvd = 0; 962 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 963 sbp->f_ffree = 0; /* what to put in here? */ 964 sbp->f_favail = 0; /* what to put in here? */ 965 sbp->f_fresvd = 0; 966 copy_statvfs_info(sbp, mp); 967 return (0); 968 } 969 970 int 971 msdosfs_sync(mp, waitfor, cred) 972 struct mount *mp; 973 int waitfor; 974 kauth_cred_t cred; 975 { 976 struct vnode *vp, *mvp; 977 struct denode *dep; 978 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 979 int error, allerror = 0; 980 981 /* 982 * If we ever switch to not updating all of the fats all the time, 983 * this would be the place to update them from the first one. 984 */ 985 if (pmp->pm_fmod != 0) { 986 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 987 panic("msdosfs_sync: rofs mod"); 988 else { 989 /* update fats here */ 990 } 991 } 992 /* Allocate a marker vnode. */ 993 if ((mvp = vnalloc(mp)) == NULL) 994 return ENOMEM; 995 /* 996 * Write back each (modified) denode. 997 */ 998 mutex_enter(&mntvnode_lock); 999 loop: 1000 for (vp = TAILQ_FIRST(&mp->mnt_vnodelist); vp; vp = vunmark(mvp)) { 1001 vmark(mvp, vp); 1002 if (vp->v_mount != mp || vismarker(vp)) 1003 continue; 1004 mutex_enter(&vp->v_interlock); 1005 dep = VTODE(vp); 1006 if (waitfor == MNT_LAZY || vp->v_type == VNON || 1007 (((dep->de_flag & 1008 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0) && 1009 (LIST_EMPTY(&vp->v_dirtyblkhd) && 1010 UVM_OBJ_IS_CLEAN(&vp->v_uobj)))) { 1011 mutex_exit(&vp->v_interlock); 1012 continue; 1013 } 1014 mutex_exit(&mntvnode_lock); 1015 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK); 1016 if (error) { 1017 mutex_enter(&mntvnode_lock); 1018 if (error == ENOENT) { 1019 (void)vunmark(mvp); 1020 goto loop; 1021 } 1022 continue; 1023 } 1024 if ((error = VOP_FSYNC(vp, cred, 1025 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0)) != 0) 1026 allerror = error; 1027 vput(vp); 1028 mutex_enter(&mntvnode_lock); 1029 } 1030 mutex_exit(&mntvnode_lock); 1031 vnfree(mvp); 1032 1033 /* 1034 * Force stale file system control information to be flushed. 1035 */ 1036 if ((error = VOP_FSYNC(pmp->pm_devvp, cred, 1037 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0)) != 0) 1038 allerror = error; 1039 return (allerror); 1040 } 1041 1042 int 1043 msdosfs_fhtovp(mp, fhp, vpp) 1044 struct mount *mp; 1045 struct fid *fhp; 1046 struct vnode **vpp; 1047 { 1048 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 1049 struct defid defh; 1050 struct denode *dep; 1051 int error; 1052 1053 if (fhp->fid_len != sizeof(struct defid)) { 1054 DPRINTF(("fid_len %d %zd\n", fhp->fid_len, 1055 sizeof(struct defid))); 1056 return EINVAL; 1057 } 1058 1059 memcpy(&defh, fhp, sizeof(defh)); 1060 error = deget(pmp, defh.defid_dirclust, defh.defid_dirofs, &dep); 1061 if (error) { 1062 DPRINTF(("deget %d\n", error)); 1063 *vpp = NULLVP; 1064 return (error); 1065 } 1066 *vpp = DETOV(dep); 1067 return (0); 1068 } 1069 1070 int 1071 msdosfs_vptofh(vp, fhp, fh_size) 1072 struct vnode *vp; 1073 struct fid *fhp; 1074 size_t *fh_size; 1075 { 1076 struct denode *dep; 1077 struct defid defh; 1078 1079 if (*fh_size < sizeof(struct defid)) { 1080 *fh_size = sizeof(struct defid); 1081 return E2BIG; 1082 } 1083 *fh_size = sizeof(struct defid); 1084 dep = VTODE(vp); 1085 memset(&defh, 0, sizeof(defh)); 1086 defh.defid_len = sizeof(struct defid); 1087 defh.defid_dirclust = dep->de_dirclust; 1088 defh.defid_dirofs = dep->de_diroffset; 1089 /* defh.defid_gen = dep->de_gen; */ 1090 memcpy(fhp, &defh, sizeof(defh)); 1091 return (0); 1092 } 1093 1094 int 1095 msdosfs_vget(struct mount *mp, ino_t ino, 1096 struct vnode **vpp) 1097 { 1098 1099 return (EOPNOTSUPP); 1100 } 1101