msdosfs_vfsops.c revision 1.111
1 /* $NetBSD: msdosfs_vfsops.c,v 1.111 2014/07/09 08:43:54 maxv 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 (at) 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 (at) 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 1.111 2014/07/09 08:43:54 maxv 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/fstrans.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, msdos, NULL); 89 90 #ifdef MSDOSFS_DEBUG 91 #define DPRINTF(a) uprintf a 92 #else 93 #define DPRINTF(a) 94 #endif 95 96 #define GEMDOSFS_BSIZE 512 97 98 #define MSDOSFS_NAMEMAX(pmp) \ 99 (pmp)->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12 100 101 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 static struct sysctllog *msdosfs_sysctl_log; 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 .vfs_name = MOUNT_MSDOS, 121 .vfs_min_mount_data = sizeof (struct msdosfs_args), 122 .vfs_mount = msdosfs_mount, 123 .vfs_start = msdosfs_start, 124 .vfs_unmount = msdosfs_unmount, 125 .vfs_root = msdosfs_root, 126 .vfs_quotactl = (void *)eopnotsupp, 127 .vfs_statvfs = msdosfs_statvfs, 128 .vfs_sync = msdosfs_sync, 129 .vfs_vget = msdosfs_vget, 130 .vfs_loadvnode = msdosfs_loadvnode, 131 .vfs_fhtovp = msdosfs_fhtovp, 132 .vfs_vptofh = msdosfs_vptofh, 133 .vfs_init = msdosfs_init, 134 .vfs_reinit = msdosfs_reinit, 135 .vfs_done = msdosfs_done, 136 .vfs_mountroot = msdosfs_mountroot, 137 .vfs_snapshot = (void *)eopnotsupp, 138 .vfs_extattrctl = vfs_stdextattrctl, 139 .vfs_suspendctl = msdosfs_suspendctl, 140 .vfs_renamelock_enter = genfs_renamelock_enter, 141 .vfs_renamelock_exit = genfs_renamelock_exit, 142 .vfs_fsync = (void *)eopnotsupp, 143 .vfs_opv_descs = msdosfs_vnodeopv_descs 144 }; 145 146 static int 147 msdos_modcmd(modcmd_t cmd, void *arg) 148 { 149 int error; 150 151 switch (cmd) { 152 case MODULE_CMD_INIT: 153 error = vfs_attach(&msdosfs_vfsops); 154 if (error != 0) 155 break; 156 sysctl_createv(&msdosfs_sysctl_log, 0, NULL, NULL, 157 CTLFLAG_PERMANENT, 158 CTLTYPE_NODE, "msdosfs", 159 SYSCTL_DESCR("MS-DOS file system"), 160 NULL, 0, NULL, 0, 161 CTL_VFS, 4, CTL_EOL); 162 /* 163 * XXX the "4" above could be dynamic, thereby eliminating one 164 * more instance of the "number to vfs" mapping problem, but 165 * "4" is the order as taken from sys/mount.h 166 */ 167 break; 168 case MODULE_CMD_FINI: 169 error = vfs_detach(&msdosfs_vfsops); 170 if (error != 0) 171 break; 172 sysctl_teardown(&msdosfs_sysctl_log); 173 break; 174 default: 175 error = ENOTTY; 176 break; 177 } 178 179 return (error); 180 } 181 182 static int 183 update_mp(struct mount *mp, struct msdosfs_args *argp) 184 { 185 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 186 int error; 187 188 pmp->pm_gid = argp->gid; 189 pmp->pm_uid = argp->uid; 190 pmp->pm_mask = argp->mask & ALLPERMS; 191 pmp->pm_dirmask = argp->dirmask & ALLPERMS; 192 pmp->pm_gmtoff = argp->gmtoff; 193 pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT; 194 195 /* 196 * GEMDOS knows nothing about win95 long filenames 197 */ 198 if (pmp->pm_flags & MSDOSFSMNT_GEMDOSFS) 199 pmp->pm_flags |= MSDOSFSMNT_NOWIN95; 200 201 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 202 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 203 else if (!(pmp->pm_flags & 204 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 205 struct vnode *rtvp; 206 207 /* 208 * Try to divine whether to support Win'95 long filenames 209 */ 210 if (FAT32(pmp)) 211 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 212 else { 213 if ((error = msdosfs_root(mp, &rtvp)) != 0) 214 return error; 215 pmp->pm_flags |= findwin95(VTODE(rtvp)) 216 ? MSDOSFSMNT_LONGNAME 217 : MSDOSFSMNT_SHORTNAME; 218 vput(rtvp); 219 } 220 } 221 222 mp->mnt_stat.f_namemax = MSDOSFS_NAMEMAX(pmp); 223 224 return 0; 225 } 226 227 int 228 msdosfs_mountroot(void) 229 { 230 struct mount *mp; 231 struct lwp *l = curlwp; /* XXX */ 232 int error; 233 struct msdosfs_args args; 234 235 if (device_class(root_device) != DV_DISK) 236 return (ENODEV); 237 238 if ((error = vfs_rootmountalloc(MOUNT_MSDOS, "root_device", &mp))) { 239 vrele(rootvp); 240 return (error); 241 } 242 243 args.flags = MSDOSFSMNT_VERSIONED; 244 args.uid = 0; 245 args.gid = 0; 246 args.mask = 0777; 247 args.version = MSDOSFSMNT_VERSION; 248 args.dirmask = 0777; 249 250 if ((error = msdosfs_mountfs(rootvp, mp, l, &args)) != 0) { 251 vfs_unbusy(mp, false, NULL); 252 vfs_destroy(mp); 253 return (error); 254 } 255 256 if ((error = update_mp(mp, &args)) != 0) { 257 (void)msdosfs_unmount(mp, 0); 258 vfs_unbusy(mp, false, NULL); 259 vfs_destroy(mp); 260 vrele(rootvp); 261 return (error); 262 } 263 264 mountlist_append(mp); 265 (void)msdosfs_statvfs(mp, &mp->mnt_stat); 266 vfs_unbusy(mp, false, NULL); 267 return (0); 268 } 269 270 /* 271 * mp - path - addr in user space of mount point (ie /usr or whatever) 272 * data - addr in user space of mount params including the name of the block 273 * special file to treat as a filesystem. 274 */ 275 int 276 msdosfs_mount(struct mount *mp, const char *path, void *data, size_t *data_len) 277 { 278 struct lwp *l = curlwp; 279 struct vnode *devvp; /* vnode for blk device to mount */ 280 struct msdosfs_args *args = data; /* holds data from mount request */ 281 /* msdosfs specific mount control block */ 282 struct msdosfsmount *pmp = NULL; 283 int error, flags; 284 mode_t accessmode; 285 286 if (args == NULL) 287 return EINVAL; 288 if (*data_len < sizeof *args) 289 return EINVAL; 290 291 if (mp->mnt_flag & MNT_GETARGS) { 292 pmp = VFSTOMSDOSFS(mp); 293 if (pmp == NULL) 294 return EIO; 295 args->fspec = NULL; 296 args->uid = pmp->pm_uid; 297 args->gid = pmp->pm_gid; 298 args->mask = pmp->pm_mask; 299 args->flags = pmp->pm_flags; 300 args->version = MSDOSFSMNT_VERSION; 301 args->dirmask = pmp->pm_dirmask; 302 args->gmtoff = pmp->pm_gmtoff; 303 *data_len = sizeof *args; 304 return 0; 305 } 306 307 /* 308 * If not versioned (i.e. using old mount_msdos(8)), fill in 309 * the additional structure items with suitable defaults. 310 */ 311 if ((args->flags & MSDOSFSMNT_VERSIONED) == 0) { 312 args->version = 1; 313 args->dirmask = args->mask; 314 } 315 316 /* 317 * Reset GMT offset for pre-v3 mount structure args. 318 */ 319 if (args->version < 3) 320 args->gmtoff = 0; 321 322 /* 323 * If updating, check whether changing from read-only to 324 * read/write; if there is no device name, that's all we do. 325 */ 326 if (mp->mnt_flag & MNT_UPDATE) { 327 pmp = VFSTOMSDOSFS(mp); 328 error = 0; 329 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && 330 (mp->mnt_flag & MNT_RDONLY)) { 331 flags = WRITECLOSE; 332 if (mp->mnt_flag & MNT_FORCE) 333 flags |= FORCECLOSE; 334 error = vflush(mp, NULLVP, flags); 335 } 336 if (!error && (mp->mnt_flag & MNT_RELOAD)) 337 /* not yet implemented */ 338 error = EOPNOTSUPP; 339 if (error) { 340 DPRINTF(("vflush %d\n", error)); 341 return (error); 342 } 343 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && 344 (mp->mnt_iflag & IMNT_WANTRDWR)) { 345 /* 346 * If upgrade to read-write by non-root, then verify 347 * that user has necessary permissions on the device. 348 * 349 * Permission to update a mount is checked higher, so 350 * here we presume updating the mount is okay (for 351 * example, as far as securelevel goes) which leaves us 352 * with the normal check. 353 */ 354 devvp = pmp->pm_devvp; 355 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 356 error = kauth_authorize_system(l->l_cred, 357 KAUTH_SYSTEM_MOUNT, KAUTH_REQ_SYSTEM_MOUNT_DEVICE, 358 mp, devvp, KAUTH_ARG(VREAD | VWRITE)); 359 VOP_UNLOCK(devvp); 360 DPRINTF(("KAUTH_REQ_SYSTEM_MOUNT_DEVICE %d\n", error)); 361 if (error) 362 return (error); 363 364 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 365 } 366 if (args->fspec == NULL) { 367 DPRINTF(("missing fspec\n")); 368 return EINVAL; 369 } 370 } 371 /* 372 * Not an update, or updating the name: look up the name 373 * and verify that it refers to a sensible block device. 374 */ 375 error = namei_simple_user(args->fspec, 376 NSM_FOLLOW_NOEMULROOT, &devvp); 377 if (error != 0) { 378 DPRINTF(("namei %d\n", error)); 379 return (error); 380 } 381 382 if (devvp->v_type != VBLK) { 383 DPRINTF(("not block\n")); 384 vrele(devvp); 385 return (ENOTBLK); 386 } 387 if (bdevsw_lookup(devvp->v_rdev) == NULL) { 388 DPRINTF(("no block switch\n")); 389 vrele(devvp); 390 return (ENXIO); 391 } 392 /* 393 * If mount by non-root, then verify that user has necessary 394 * permissions on the device. 395 */ 396 accessmode = VREAD; 397 if ((mp->mnt_flag & MNT_RDONLY) == 0) 398 accessmode |= VWRITE; 399 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 400 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT, 401 KAUTH_REQ_SYSTEM_MOUNT_DEVICE, mp, devvp, KAUTH_ARG(accessmode)); 402 VOP_UNLOCK(devvp); 403 if (error) { 404 DPRINTF(("KAUTH_REQ_SYSTEM_MOUNT_DEVICE %d\n", error)); 405 vrele(devvp); 406 return (error); 407 } 408 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 409 int xflags; 410 411 if (mp->mnt_flag & MNT_RDONLY) 412 xflags = FREAD; 413 else 414 xflags = FREAD|FWRITE; 415 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 416 error = VOP_OPEN(devvp, xflags, FSCRED); 417 VOP_UNLOCK(devvp); 418 if (error) { 419 DPRINTF(("VOP_OPEN %d\n", error)); 420 goto fail; 421 } 422 error = msdosfs_mountfs(devvp, mp, l, args); 423 if (error) { 424 DPRINTF(("msdosfs_mountfs %d\n", error)); 425 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 426 (void) VOP_CLOSE(devvp, xflags, NOCRED); 427 VOP_UNLOCK(devvp); 428 goto fail; 429 } 430 #ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 431 pmp = VFSTOMSDOSFS(mp); 432 #endif 433 } else { 434 vrele(devvp); 435 if (devvp != pmp->pm_devvp) { 436 DPRINTF(("devvp %p pmp %p\n", 437 devvp, pmp->pm_devvp)); 438 return (EINVAL); /* needs translation */ 439 } 440 } 441 if ((error = update_mp(mp, args)) != 0) { 442 msdosfs_unmount(mp, MNT_FORCE); 443 DPRINTF(("update_mp %d\n", error)); 444 return error; 445 } 446 447 #ifdef MSDOSFS_DEBUG 448 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 449 #endif 450 return set_statvfs_info(path, UIO_USERSPACE, args->fspec, UIO_USERSPACE, 451 mp->mnt_op->vfs_name, mp, l); 452 453 fail: 454 vrele(devvp); 455 return (error); 456 } 457 458 int 459 msdosfs_mountfs(struct vnode *devvp, struct mount *mp, struct lwp *l, struct msdosfs_args *argp) 460 { 461 struct msdosfsmount *pmp; 462 struct buf *bp; 463 dev_t dev = devvp->v_rdev; 464 union bootsector *bsp; 465 struct byte_bpb33 *b33; 466 struct byte_bpb50 *b50; 467 struct byte_bpb710 *b710; 468 uint8_t SecPerClust; 469 int ronly, error, BlkPerSec; 470 uint64_t psize; 471 unsigned secsize; 472 473 /* Flush out any old buffers remaining from a previous use. */ 474 if ((error = vinvalbuf(devvp, V_SAVE, l->l_cred, l, 0, 0)) != 0) 475 return (error); 476 477 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 478 479 bp = NULL; /* both used in error_exit */ 480 pmp = NULL; 481 482 error = fstrans_mount(mp); 483 if (error) 484 goto error_exit; 485 486 error = getdisksize(devvp, &psize, &secsize); 487 if (error) { 488 if (argp->flags & MSDOSFSMNT_GEMDOSFS) 489 goto error_exit; 490 491 /* ok, so it failed. we most likely don't need the info */ 492 secsize = DEV_BSIZE; 493 psize = 0; 494 error = 0; 495 } 496 497 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 498 if (secsize != GEMDOSFS_BSIZE) { 499 DPRINTF(("Invalid block secsize %d for GEMDOS\n", secsize)); 500 error = EINVAL; 501 goto error_exit; 502 } 503 } 504 505 /* 506 * Read the boot sector of the filesystem, and then check the 507 * boot signature. If not a dos boot sector then error out. 508 */ 509 if ((error = bread(devvp, 0, secsize, NOCRED, 0, &bp)) != 0) 510 goto error_exit; 511 bsp = (union bootsector *)bp->b_data; 512 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 513 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 514 b710 = (struct byte_bpb710 *)bsp->bs710.bsBPB; 515 516 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 517 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 518 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 519 DPRINTF(("bootsig0 %d bootsig1 %d\n", 520 bsp->bs50.bsBootSectSig0, 521 bsp->bs50.bsBootSectSig1)); 522 error = EINVAL; 523 goto error_exit; 524 } 525 } 526 527 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK); 528 memset(pmp, 0, sizeof *pmp); 529 pmp->pm_mountp = mp; 530 531 /* 532 * Compute several useful quantities from the bpb in the 533 * bootsector. Copy in the dos 5 variant of the bpb then fix up 534 * the fields that are different between dos 5 and dos 3.3. 535 */ 536 SecPerClust = b50->bpbSecPerClust; 537 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 538 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 539 pmp->pm_FATs = b50->bpbFATs; 540 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 541 pmp->pm_Sectors = getushort(b50->bpbSectors); 542 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 543 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 544 pmp->pm_Heads = getushort(b50->bpbHeads); 545 pmp->pm_Media = b50->bpbMedia; 546 547 if (pmp->pm_Sectors == 0) { 548 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 549 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 550 } else { 551 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 552 pmp->pm_HugeSectors = pmp->pm_Sectors; 553 } 554 555 /* 556 * Sanity checks, from the FAT specification: 557 * - sectors per cluster: >= 1, power of 2 558 * - logical sector size: >= 1, power of 2 559 * - cluster size: <= max FS block size 560 * - number of sectors: >= 1 561 */ 562 if ((SecPerClust == 0) || !powerof2(SecPerClust) || 563 (pmp->pm_BytesPerSec == 0) || !powerof2(pmp->pm_BytesPerSec) || 564 (SecPerClust * pmp->pm_BytesPerSec > MAXBSIZE) || 565 (pmp->pm_HugeSectors == 0)) { 566 DPRINTF(("consistency checks\n")); 567 error = EINVAL; 568 goto error_exit; 569 } 570 571 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS) && 572 (pmp->pm_SecPerTrack > 63)) { 573 DPRINTF(("SecPerTrack %d\n", pmp->pm_SecPerTrack)); 574 error = EINVAL; 575 goto error_exit; 576 } 577 578 if (pmp->pm_RootDirEnts == 0) { 579 unsigned short vers = getushort(b710->bpbFSVers); 580 /* 581 * Some say that bsBootSectSig[23] must be zero, but 582 * Windows does not require this and some digital cameras 583 * do not set these to zero. Therefore, do not insist. 584 */ 585 if (pmp->pm_Sectors || pmp->pm_FATsecs || vers) { 586 DPRINTF(("sectors %d fatsecs %lu vers %d\n", 587 pmp->pm_Sectors, pmp->pm_FATsecs, vers)); 588 error = EINVAL; 589 goto error_exit; 590 } 591 pmp->pm_fatmask = FAT32_MASK; 592 pmp->pm_fatmult = 4; 593 pmp->pm_fatdiv = 1; 594 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 595 596 /* mirrorring is enabled if the FATMIRROR bit is not set */ 597 if ((getushort(b710->bpbExtFlags) & FATMIRROR) == 0) 598 pmp->pm_flags |= MSDOSFS_FATMIRROR; 599 else 600 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 601 } else 602 pmp->pm_flags |= MSDOSFS_FATMIRROR; 603 604 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 605 if (FAT32(pmp)) { 606 DPRINTF(("FAT32 for GEMDOS\n")); 607 /* 608 * GEMDOS doesn't know FAT32. 609 */ 610 error = EINVAL; 611 goto error_exit; 612 } 613 614 /* 615 * Check a few values (could do some more): 616 * - logical sector size: >= block size 617 * - number of sectors: <= size of partition 618 */ 619 if ((pmp->pm_BytesPerSec < GEMDOSFS_BSIZE) || 620 (pmp->pm_HugeSectors * 621 (pmp->pm_BytesPerSec / GEMDOSFS_BSIZE) > psize)) { 622 DPRINTF(("consistency checks for GEMDOS\n")); 623 error = EINVAL; 624 goto error_exit; 625 } 626 /* 627 * XXX - Many parts of the msdosfs driver seem to assume that 628 * the number of bytes per logical sector (BytesPerSec) will 629 * always be the same as the number of bytes per disk block 630 * Let's pretend it is. 631 */ 632 BlkPerSec = pmp->pm_BytesPerSec / GEMDOSFS_BSIZE; 633 pmp->pm_BytesPerSec = GEMDOSFS_BSIZE; 634 pmp->pm_HugeSectors *= BlkPerSec; 635 pmp->pm_HiddenSects *= BlkPerSec; 636 pmp->pm_ResSectors *= BlkPerSec; 637 pmp->pm_Sectors *= BlkPerSec; 638 pmp->pm_FATsecs *= BlkPerSec; 639 SecPerClust *= BlkPerSec; 640 } 641 642 /* Check that fs has nonzero FAT size */ 643 if (pmp->pm_FATsecs == 0) { 644 DPRINTF(("FATsecs is 0\n")); 645 error = EINVAL; 646 goto error_exit; 647 } 648 649 pmp->pm_fatblk = pmp->pm_ResSectors; 650 if (FAT32(pmp)) { 651 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 652 pmp->pm_firstcluster = pmp->pm_fatblk 653 + (pmp->pm_FATs * pmp->pm_FATsecs); 654 pmp->pm_fsinfo = getushort(b710->bpbFSInfo); 655 } else { 656 pmp->pm_rootdirblk = pmp->pm_fatblk + 657 (pmp->pm_FATs * pmp->pm_FATsecs); 658 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 659 + pmp->pm_BytesPerSec - 1) 660 / pmp->pm_BytesPerSec;/* in sectors */ 661 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 662 } 663 664 pmp->pm_nmbrofclusters = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 665 SecPerClust; 666 pmp->pm_maxcluster = pmp->pm_nmbrofclusters + 1; 667 pmp->pm_fatsize = pmp->pm_FATsecs * pmp->pm_BytesPerSec; 668 669 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 670 if (pmp->pm_nmbrofclusters <= (0xff0 - 2)) { 671 pmp->pm_fatmask = FAT12_MASK; 672 pmp->pm_fatmult = 3; 673 pmp->pm_fatdiv = 2; 674 } else { 675 pmp->pm_fatmask = FAT16_MASK; 676 pmp->pm_fatmult = 2; 677 pmp->pm_fatdiv = 1; 678 } 679 } else if (pmp->pm_fatmask == 0) { 680 if (pmp->pm_maxcluster 681 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 682 /* 683 * This will usually be a floppy disk. This size makes 684 * sure that one FAT entry will not be split across 685 * multiple blocks. 686 */ 687 pmp->pm_fatmask = FAT12_MASK; 688 pmp->pm_fatmult = 3; 689 pmp->pm_fatdiv = 2; 690 } else { 691 pmp->pm_fatmask = FAT16_MASK; 692 pmp->pm_fatmult = 2; 693 pmp->pm_fatdiv = 1; 694 } 695 } 696 if (FAT12(pmp)) 697 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 698 else 699 pmp->pm_fatblocksize = MAXBSIZE; 700 701 pmp->pm_fatblocksec = pmp->pm_fatblocksize / pmp->pm_BytesPerSec; 702 pmp->pm_bnshift = ffs(pmp->pm_BytesPerSec) - 1; 703 704 /* 705 * Compute mask and shift value for isolating cluster relative byte 706 * offsets and cluster numbers from a file offset. 707 */ 708 pmp->pm_bpcluster = SecPerClust * pmp->pm_BytesPerSec; 709 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 710 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 711 712 /* 713 * Check for valid cluster size 714 * must be a power of 2 715 */ 716 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 717 DPRINTF(("bpcluster %lu cnshift %lu\n", 718 pmp->pm_bpcluster, pmp->pm_cnshift)); 719 error = EINVAL; 720 goto error_exit; 721 } 722 723 /* 724 * Cluster size must be within limit of MAXBSIZE. 725 * Many FAT filesystems will not have clusters larger than 726 * 32KiB due to limits in Windows versions before Vista. 727 */ 728 if (pmp->pm_bpcluster > MAXBSIZE) { 729 DPRINTF(("bpcluster %lu > MAXBSIZE %d\n", 730 pmp->pm_bpcluster, MAXBSIZE)); 731 error = EINVAL; 732 goto error_exit; 733 } 734 735 /* 736 * Release the bootsector buffer. 737 */ 738 brelse(bp, BC_AGE); 739 bp = NULL; 740 741 /* 742 * Check FSInfo. 743 */ 744 if (pmp->pm_fsinfo) { 745 struct fsinfo *fp; 746 747 /* 748 * XXX If the fsinfo block is stored on media with 749 * 2KB or larger sectors, is the fsinfo structure 750 * padded at the end or in the middle? 751 */ 752 if ((error = bread(devvp, de_bn2kb(pmp, pmp->pm_fsinfo), 753 pmp->pm_BytesPerSec, NOCRED, 0, &bp)) != 0) 754 goto error_exit; 755 fp = (struct fsinfo *)bp->b_data; 756 if (!memcmp(fp->fsisig1, "RRaA", 4) 757 && !memcmp(fp->fsisig2, "rrAa", 4) 758 && !memcmp(fp->fsisig3, "\0\0\125\252", 4) 759 && !memcmp(fp->fsisig4, "\0\0\125\252", 4)) 760 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 761 else 762 pmp->pm_fsinfo = 0; 763 brelse(bp, 0); 764 bp = NULL; 765 } 766 767 /* 768 * Check and validate (or perhaps invalidate?) the fsinfo structure? 769 * XXX 770 */ 771 if (pmp->pm_fsinfo) { 772 if ((pmp->pm_nxtfree == 0xffffffffUL) || 773 (pmp->pm_nxtfree > pmp->pm_maxcluster)) 774 pmp->pm_fsinfo = 0; 775 } 776 777 /* 778 * Allocate memory for the bitmap of allocated clusters, and then 779 * fill it in. 780 */ 781 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS) 782 / N_INUSEBITS) 783 * sizeof(*pmp->pm_inusemap), 784 M_MSDOSFSFAT, M_WAITOK); 785 786 /* 787 * fillinusemap() needs pm_devvp. 788 */ 789 pmp->pm_dev = dev; 790 pmp->pm_devvp = devvp; 791 792 /* 793 * Have the inuse map filled in. 794 */ 795 if ((error = fillinusemap(pmp)) != 0) { 796 DPRINTF(("fillinusemap %d\n", error)); 797 goto error_exit; 798 } 799 800 /* 801 * If they want FAT updates to be synchronous then let them suffer 802 * the performance degradation in exchange for the on disk copy of 803 * the FAT being correct just about all the time. I suppose this 804 * would be a good thing to turn on if the kernel is still flakey. 805 */ 806 if (mp->mnt_flag & MNT_SYNCHRONOUS) 807 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 808 809 /* 810 * Finish up. 811 */ 812 if (ronly) 813 pmp->pm_flags |= MSDOSFSMNT_RONLY; 814 else 815 pmp->pm_fmod = 1; 816 mp->mnt_data = pmp; 817 mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev; 818 mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_MSDOS); 819 mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; 820 mp->mnt_stat.f_namemax = MSDOSFS_NAMEMAX(pmp); 821 mp->mnt_flag |= MNT_LOCAL; 822 mp->mnt_dev_bshift = pmp->pm_bnshift; 823 mp->mnt_fs_bshift = pmp->pm_cnshift; 824 825 /* 826 * If we ever do quotas for DOS filesystems this would be a place 827 * to fill in the info in the msdosfsmount structure. You dolt, 828 * quotas on dos filesystems make no sense because files have no 829 * owners on dos filesystems. of course there is some empty space 830 * in the directory entry where we could put uid's and gid's. 831 */ 832 833 spec_node_setmountedfs(devvp, mp); 834 835 return (0); 836 837 error_exit: 838 fstrans_unmount(mp); 839 if (bp) 840 brelse(bp, BC_AGE); 841 if (pmp) { 842 if (pmp->pm_inusemap) 843 free(pmp->pm_inusemap, M_MSDOSFSFAT); 844 free(pmp, M_MSDOSFSMNT); 845 mp->mnt_data = NULL; 846 } 847 return (error); 848 } 849 850 int 851 msdosfs_start(struct mount *mp, int flags) 852 { 853 854 return (0); 855 } 856 857 /* 858 * Unmount the filesystem described by mp. 859 */ 860 int 861 msdosfs_unmount(struct mount *mp, int mntflags) 862 { 863 struct msdosfsmount *pmp; 864 int error, flags; 865 866 flags = 0; 867 if (mntflags & MNT_FORCE) 868 flags |= FORCECLOSE; 869 if ((error = vflush(mp, NULLVP, flags)) != 0) 870 return (error); 871 pmp = VFSTOMSDOSFS(mp); 872 if (pmp->pm_devvp->v_type != VBAD) 873 spec_node_setmountedfs(pmp->pm_devvp, NULL); 874 #ifdef MSDOSFS_DEBUG 875 { 876 struct vnode *vp = pmp->pm_devvp; 877 878 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 879 printf("flag %08x, usecount %d, writecount %d, holdcnt %d\n", 880 vp->v_vflag | vp->v_iflag | vp->v_uflag, vp->v_usecount, 881 vp->v_writecount, vp->v_holdcnt); 882 printf("mount %p, op %p\n", 883 vp->v_mount, vp->v_op); 884 printf("freef %p, freeb %p, mount %p\n", 885 vp->v_freelist.tqe_next, vp->v_freelist.tqe_prev, 886 vp->v_mount); 887 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %d, type %d\n", 888 vp->v_cleanblkhd.lh_first, 889 vp->v_dirtyblkhd.lh_first, 890 vp->v_numoutput, vp->v_type); 891 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 892 vp->v_socket, vp->v_tag, 893 ((u_int *)vp->v_data)[0], 894 ((u_int *)vp->v_data)[1]); 895 } 896 #endif 897 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY); 898 (void) VOP_CLOSE(pmp->pm_devvp, 899 pmp->pm_flags & MSDOSFSMNT_RONLY ? FREAD : FREAD|FWRITE, NOCRED); 900 vput(pmp->pm_devvp); 901 msdosfs_fh_destroy(pmp); 902 free(pmp->pm_inusemap, M_MSDOSFSFAT); 903 free(pmp, M_MSDOSFSMNT); 904 mp->mnt_data = NULL; 905 mp->mnt_flag &= ~MNT_LOCAL; 906 fstrans_unmount(mp); 907 return (0); 908 } 909 910 int 911 msdosfs_root(struct mount *mp, struct vnode **vpp) 912 { 913 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 914 int error; 915 916 #ifdef MSDOSFS_DEBUG 917 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 918 #endif 919 if ((error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, vpp)) != 0) 920 return error; 921 error = vn_lock(*vpp, LK_EXCLUSIVE); 922 if (error) { 923 vrele(*vpp); 924 *vpp = NULL; 925 return error; 926 } 927 return 0; 928 } 929 930 int 931 msdosfs_statvfs(struct mount *mp, struct statvfs *sbp) 932 { 933 struct msdosfsmount *pmp; 934 935 pmp = VFSTOMSDOSFS(mp); 936 sbp->f_bsize = pmp->pm_bpcluster; 937 sbp->f_frsize = sbp->f_bsize; 938 sbp->f_iosize = pmp->pm_bpcluster; 939 sbp->f_blocks = pmp->pm_nmbrofclusters; 940 sbp->f_bfree = pmp->pm_freeclustercount; 941 sbp->f_bavail = pmp->pm_freeclustercount; 942 sbp->f_bresvd = 0; 943 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 944 sbp->f_ffree = 0; /* what to put in here? */ 945 sbp->f_favail = 0; /* what to put in here? */ 946 sbp->f_fresvd = 0; 947 copy_statvfs_info(sbp, mp); 948 return (0); 949 } 950 951 struct msdosfs_sync_ctx { 952 int waitfor; 953 }; 954 955 static bool 956 msdosfs_sync_selector(void *cl, struct vnode *vp) 957 { 958 struct msdosfs_sync_ctx *c = cl; 959 struct denode *dep; 960 961 dep = VTODE(vp); 962 if (c->waitfor == MNT_LAZY || vp->v_type == VNON || 963 dep == NULL || (((dep->de_flag & 964 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0) && 965 (LIST_EMPTY(&vp->v_dirtyblkhd) && 966 UVM_OBJ_IS_CLEAN(&vp->v_uobj)))) 967 return false; 968 return true; 969 } 970 971 int 972 msdosfs_sync(struct mount *mp, int waitfor, kauth_cred_t cred) 973 { 974 struct vnode *vp; 975 struct vnode_iterator *marker; 976 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 977 int error, allerror = 0; 978 struct msdosfs_sync_ctx ctx; 979 980 /* 981 * If we ever switch to not updating all of the FATs all the time, 982 * this would be the place to update them from the first one. 983 */ 984 if (pmp->pm_fmod != 0) { 985 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 986 panic("msdosfs_sync: rofs mod"); 987 else { 988 /* update FATs here */ 989 } 990 } 991 fstrans_start(mp, FSTRANS_SHARED); 992 /* 993 * Write back each (modified) denode. 994 */ 995 vfs_vnode_iterator_init(mp, &marker); 996 ctx.waitfor = waitfor; 997 while ((vp = vfs_vnode_iterator_next(marker, msdosfs_sync_selector, 998 &ctx))) 999 { 1000 error = vn_lock(vp, LK_EXCLUSIVE); 1001 if (error) { 1002 vrele(vp); 1003 continue; 1004 } 1005 if ((error = VOP_FSYNC(vp, cred, 1006 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0)) != 0) 1007 allerror = error; 1008 vput(vp); 1009 } 1010 vfs_vnode_iterator_destroy(marker); 1011 1012 /* 1013 * Force stale file system control information to be flushed. 1014 */ 1015 if ((error = VOP_FSYNC(pmp->pm_devvp, cred, 1016 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0)) != 0) 1017 allerror = error; 1018 fstrans_done(mp); 1019 return (allerror); 1020 } 1021 1022 int 1023 msdosfs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) 1024 { 1025 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 1026 struct defid defh; 1027 uint32_t gen; 1028 int error; 1029 1030 if (fhp->fid_len != sizeof(struct defid)) { 1031 DPRINTF(("fid_len %d %zd\n", fhp->fid_len, 1032 sizeof(struct defid))); 1033 return EINVAL; 1034 } 1035 memcpy(&defh, fhp, sizeof(defh)); 1036 error = msdosfs_fh_lookup(pmp, defh.defid_dirclust, defh.defid_dirofs, 1037 &gen); 1038 if (error == 0 && gen != defh.defid_gen) 1039 error = ESTALE; 1040 if (error) { 1041 *vpp = NULLVP; 1042 return error; 1043 } 1044 error = deget(pmp, defh.defid_dirclust, defh.defid_dirofs, vpp); 1045 if (error) { 1046 DPRINTF(("deget %d\n", error)); 1047 *vpp = NULLVP; 1048 return error; 1049 } 1050 error = vn_lock(*vpp, LK_EXCLUSIVE); 1051 if (error) { 1052 vrele(*vpp); 1053 *vpp = NULLVP; 1054 return error; 1055 } 1056 return 0; 1057 } 1058 1059 int 1060 msdosfs_vptofh(struct vnode *vp, struct fid *fhp, size_t *fh_size) 1061 { 1062 struct msdosfsmount *pmp = VFSTOMSDOSFS(vp->v_mount); 1063 struct denode *dep; 1064 struct defid defh; 1065 int error; 1066 1067 if (*fh_size < sizeof(struct defid)) { 1068 *fh_size = sizeof(struct defid); 1069 return E2BIG; 1070 } 1071 *fh_size = sizeof(struct defid); 1072 dep = VTODE(vp); 1073 memset(&defh, 0, sizeof(defh)); 1074 defh.defid_len = sizeof(struct defid); 1075 defh.defid_dirclust = dep->de_dirclust; 1076 defh.defid_dirofs = dep->de_diroffset; 1077 error = msdosfs_fh_enter(pmp, dep->de_dirclust, dep->de_diroffset, 1078 &defh.defid_gen); 1079 if (error == 0) 1080 memcpy(fhp, &defh, sizeof(defh)); 1081 return error; 1082 } 1083 1084 int 1085 msdosfs_vget(struct mount *mp, ino_t ino, 1086 struct vnode **vpp) 1087 { 1088 1089 return (EOPNOTSUPP); 1090 } 1091 1092 int 1093 msdosfs_suspendctl(struct mount *mp, int cmd) 1094 { 1095 int error; 1096 struct lwp *l = curlwp; 1097 1098 switch (cmd) { 1099 case SUSPEND_SUSPEND: 1100 if ((error = fstrans_setstate(mp, FSTRANS_SUSPENDING)) != 0) 1101 return error; 1102 error = msdosfs_sync(mp, MNT_WAIT, l->l_proc->p_cred); 1103 if (error == 0) 1104 error = fstrans_setstate(mp, FSTRANS_SUSPENDED); 1105 if (error != 0) { 1106 (void) fstrans_setstate(mp, FSTRANS_NORMAL); 1107 return error; 1108 } 1109 return 0; 1110 1111 case SUSPEND_RESUME: 1112 return fstrans_setstate(mp, FSTRANS_NORMAL); 1113 1114 default: 1115 return EINVAL; 1116 } 1117 } 1118
Indexes created Sat Oct 18 23:09:54 GMT 2025