msdosfs_vfsops.c revision 1.93.6.4
1 /* $NetBSD: msdosfs_vfsops.c,v 1.93.6.4 2017/10/13 08:05:30 snj 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 1.93.6.4 2017/10/13 08:05:30 snj 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 VFS_PROTOS(msdosfs); 102 103 int msdosfs_mountfs(struct vnode *, struct mount *, struct lwp *, 104 struct msdosfs_args *); 105 106 static int update_mp(struct mount *, struct msdosfs_args *); 107 108 MALLOC_JUSTDEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOS FS mount structure"); 109 MALLOC_JUSTDEFINE(M_MSDOSFSFAT, "MSDOSFS fat", "MSDOS FS fat table"); 110 MALLOC_JUSTDEFINE(M_MSDOSFSTMP, "MSDOSFS temp", "MSDOS FS temp. structures"); 111 112 #define ROOTNAME "root_device" 113 114 static struct sysctllog *msdosfs_sysctl_log; 115 116 extern const struct vnodeopv_desc msdosfs_vnodeop_opv_desc; 117 118 const struct vnodeopv_desc * const msdosfs_vnodeopv_descs[] = { 119 &msdosfs_vnodeop_opv_desc, 120 NULL, 121 }; 122 123 struct vfsops msdosfs_vfsops = { 124 MOUNT_MSDOS, 125 sizeof (struct msdosfs_args), 126 msdosfs_mount, 127 msdosfs_start, 128 msdosfs_unmount, 129 msdosfs_root, 130 (void *)eopnotsupp, /* vfs_quotactl */ 131 msdosfs_statvfs, 132 msdosfs_sync, 133 msdosfs_vget, 134 msdosfs_fhtovp, 135 msdosfs_vptofh, 136 msdosfs_init, 137 msdosfs_reinit, 138 msdosfs_done, 139 msdosfs_mountroot, 140 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 141 vfs_stdextattrctl, 142 msdosfs_suspendctl, 143 genfs_renamelock_enter, 144 genfs_renamelock_exit, 145 (void *)eopnotsupp, 146 msdosfs_vnodeopv_descs, 147 0, 148 { NULL, NULL }, 149 }; 150 151 static int 152 msdos_modcmd(modcmd_t cmd, void *arg) 153 { 154 int error; 155 156 switch (cmd) { 157 case MODULE_CMD_INIT: 158 error = vfs_attach(&msdosfs_vfsops); 159 if (error != 0) 160 break; 161 sysctl_createv(&msdosfs_sysctl_log, 0, NULL, NULL, 162 CTLFLAG_PERMANENT, 163 CTLTYPE_NODE, "vfs", NULL, 164 NULL, 0, NULL, 0, 165 CTL_VFS, CTL_EOL); 166 sysctl_createv(&msdosfs_sysctl_log, 0, NULL, NULL, 167 CTLFLAG_PERMANENT, 168 CTLTYPE_NODE, "msdosfs", 169 SYSCTL_DESCR("MS-DOS file system"), 170 NULL, 0, NULL, 0, 171 CTL_VFS, 4, CTL_EOL); 172 /* 173 * XXX the "4" above could be dynamic, thereby eliminating one 174 * more instance of the "number to vfs" mapping problem, but 175 * "4" is the order as taken from sys/mount.h 176 */ 177 break; 178 case MODULE_CMD_FINI: 179 error = vfs_detach(&msdosfs_vfsops); 180 if (error != 0) 181 break; 182 sysctl_teardown(&msdosfs_sysctl_log); 183 break; 184 default: 185 error = ENOTTY; 186 break; 187 } 188 189 return (error); 190 } 191 192 static int 193 update_mp(struct mount *mp, struct msdosfs_args *argp) 194 { 195 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 196 int error; 197 198 pmp->pm_gid = argp->gid; 199 pmp->pm_uid = argp->uid; 200 pmp->pm_mask = argp->mask & ALLPERMS; 201 pmp->pm_dirmask = argp->dirmask & ALLPERMS; 202 pmp->pm_gmtoff = argp->gmtoff; 203 pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT; 204 205 /* 206 * GEMDOS knows nothing about win95 long filenames 207 */ 208 if (pmp->pm_flags & MSDOSFSMNT_GEMDOSFS) 209 pmp->pm_flags |= MSDOSFSMNT_NOWIN95; 210 211 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 212 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 213 else if (!(pmp->pm_flags & 214 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 215 struct vnode *rtvp; 216 217 /* 218 * Try to divine whether to support Win'95 long filenames 219 */ 220 if (FAT32(pmp)) 221 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 222 else { 223 if ((error = msdosfs_root(mp, &rtvp)) != 0) 224 return error; 225 pmp->pm_flags |= findwin95(VTODE(rtvp)) 226 ? MSDOSFSMNT_LONGNAME 227 : MSDOSFSMNT_SHORTNAME; 228 vput(rtvp); 229 } 230 } 231 232 mp->mnt_stat.f_namemax = MSDOSFS_NAMEMAX(pmp); 233 234 return 0; 235 } 236 237 int 238 msdosfs_mountroot(void) 239 { 240 struct mount *mp; 241 struct lwp *l = curlwp; /* XXX */ 242 int error; 243 struct msdosfs_args args; 244 245 if (device_class(root_device) != DV_DISK) 246 return (ENODEV); 247 248 if ((error = vfs_rootmountalloc(MOUNT_MSDOS, "root_device", &mp))) { 249 vrele(rootvp); 250 return (error); 251 } 252 253 args.flags = MSDOSFSMNT_VERSIONED; 254 args.uid = 0; 255 args.gid = 0; 256 args.mask = 0777; 257 args.version = MSDOSFSMNT_VERSION; 258 args.dirmask = 0777; 259 260 if ((error = msdosfs_mountfs(rootvp, mp, l, &args)) != 0) { 261 vfs_unbusy(mp, false, NULL); 262 vfs_destroy(mp); 263 return (error); 264 } 265 266 if ((error = update_mp(mp, &args)) != 0) { 267 (void)msdosfs_unmount(mp, 0); 268 vfs_unbusy(mp, false, NULL); 269 vfs_destroy(mp); 270 vrele(rootvp); 271 return (error); 272 } 273 274 mutex_enter(&mountlist_lock); 275 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 276 mutex_exit(&mountlist_lock); 277 (void)msdosfs_statvfs(mp, &mp->mnt_stat); 278 vfs_unbusy(mp, false, NULL); 279 return (0); 280 } 281 282 /* 283 * mp - path - addr in user space of mount point (ie /usr or whatever) 284 * data - addr in user space of mount params including the name of the block 285 * special file to treat as a filesystem. 286 */ 287 int 288 msdosfs_mount(struct mount *mp, const char *path, void *data, size_t *data_len) 289 { 290 struct lwp *l = curlwp; 291 struct vnode *devvp; /* vnode for blk device to mount */ 292 struct msdosfs_args *args = data; /* holds data from mount request */ 293 /* msdosfs specific mount control block */ 294 struct msdosfsmount *pmp = NULL; 295 int error, flags; 296 mode_t accessmode; 297 298 if (args == NULL) 299 return EINVAL; 300 if (*data_len < sizeof *args) 301 return EINVAL; 302 303 if (mp->mnt_flag & MNT_GETARGS) { 304 pmp = VFSTOMSDOSFS(mp); 305 if (pmp == NULL) 306 return EIO; 307 args->fspec = NULL; 308 args->uid = pmp->pm_uid; 309 args->gid = pmp->pm_gid; 310 args->mask = pmp->pm_mask; 311 args->flags = pmp->pm_flags; 312 args->version = MSDOSFSMNT_VERSION; 313 args->dirmask = pmp->pm_dirmask; 314 args->gmtoff = pmp->pm_gmtoff; 315 *data_len = sizeof *args; 316 return 0; 317 } 318 319 /* 320 * If not versioned (i.e. using old mount_msdos(8)), fill in 321 * the additional structure items with suitable defaults. 322 */ 323 if ((args->flags & MSDOSFSMNT_VERSIONED) == 0) { 324 args->version = 1; 325 args->dirmask = args->mask; 326 } 327 328 /* 329 * Reset GMT offset for pre-v3 mount structure args. 330 */ 331 if (args->version < 3) 332 args->gmtoff = 0; 333 334 /* 335 * If updating, check whether changing from read-only to 336 * read/write; if there is no device name, that's all we do. 337 */ 338 if (mp->mnt_flag & MNT_UPDATE) { 339 pmp = VFSTOMSDOSFS(mp); 340 error = 0; 341 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && 342 (mp->mnt_flag & MNT_RDONLY)) { 343 flags = WRITECLOSE; 344 if (mp->mnt_flag & MNT_FORCE) 345 flags |= FORCECLOSE; 346 error = vflush(mp, NULLVP, flags); 347 } 348 if (!error && (mp->mnt_flag & MNT_RELOAD)) 349 /* not yet implemented */ 350 error = EOPNOTSUPP; 351 if (error) { 352 DPRINTF(("vflush %d\n", error)); 353 return (error); 354 } 355 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && 356 (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 * Permission to update a mount is checked higher, so 362 * here we presume updating the mount is okay (for 363 * example, as far as securelevel goes) which leaves us 364 * with the normal check. 365 */ 366 devvp = pmp->pm_devvp; 367 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 368 error = genfs_can_mount(devvp, VREAD | VWRITE, 369 l->l_cred); 370 VOP_UNLOCK(devvp); 371 DPRINTF(("genfs_can_mount %d\n", error)); 372 if (error) 373 return (error); 374 375 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 376 } 377 if (args->fspec == NULL) { 378 DPRINTF(("missing fspec\n")); 379 return EINVAL; 380 } 381 } 382 /* 383 * Not an update, or updating the name: look up the name 384 * and verify that it refers to a sensible block device. 385 */ 386 error = namei_simple_user(args->fspec, 387 NSM_FOLLOW_NOEMULROOT, &devvp); 388 if (error != 0) { 389 DPRINTF(("namei %d\n", error)); 390 return (error); 391 } 392 393 if (devvp->v_type != VBLK) { 394 DPRINTF(("not block\n")); 395 vrele(devvp); 396 return (ENOTBLK); 397 } 398 if (bdevsw_lookup(devvp->v_rdev) == NULL) { 399 DPRINTF(("no block switch\n")); 400 vrele(devvp); 401 return (ENXIO); 402 } 403 /* 404 * If mount by non-root, then verify that user has necessary 405 * permissions on the device. 406 */ 407 accessmode = VREAD; 408 if ((mp->mnt_flag & MNT_RDONLY) == 0) 409 accessmode |= VWRITE; 410 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 411 error = genfs_can_mount(devvp, accessmode, l->l_cred); 412 VOP_UNLOCK(devvp); 413 if (error) { 414 DPRINTF(("genfs_can_mount %d\n", error)); 415 vrele(devvp); 416 return (error); 417 } 418 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 419 int xflags; 420 421 if (mp->mnt_flag & MNT_RDONLY) 422 xflags = FREAD; 423 else 424 xflags = FREAD|FWRITE; 425 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 426 error = VOP_OPEN(devvp, xflags, FSCRED); 427 VOP_UNLOCK(devvp); 428 if (error) { 429 DPRINTF(("VOP_OPEN %d\n", error)); 430 goto fail; 431 } 432 error = msdosfs_mountfs(devvp, mp, l, args); 433 if (error) { 434 DPRINTF(("msdosfs_mountfs %d\n", error)); 435 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 436 (void) VOP_CLOSE(devvp, xflags, NOCRED); 437 VOP_UNLOCK(devvp); 438 goto fail; 439 } 440 #ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 441 pmp = VFSTOMSDOSFS(mp); 442 #endif 443 } else { 444 vrele(devvp); 445 if (devvp != pmp->pm_devvp) { 446 DPRINTF(("devvp %p pmp %p\n", 447 devvp, pmp->pm_devvp)); 448 return (EINVAL); /* needs translation */ 449 } 450 } 451 if ((error = update_mp(mp, args)) != 0) { 452 msdosfs_unmount(mp, MNT_FORCE); 453 DPRINTF(("update_mp %d\n", error)); 454 return error; 455 } 456 457 #ifdef MSDOSFS_DEBUG 458 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 459 #endif 460 return set_statvfs_info(path, UIO_USERSPACE, args->fspec, UIO_USERSPACE, 461 mp->mnt_op->vfs_name, mp, l); 462 463 fail: 464 vrele(devvp); 465 return (error); 466 } 467 468 int 469 msdosfs_mountfs(struct vnode *devvp, struct mount *mp, struct lwp *l, struct msdosfs_args *argp) 470 { 471 struct msdosfsmount *pmp; 472 struct buf *bp; 473 dev_t dev = devvp->v_rdev; 474 union bootsector *bsp; 475 struct byte_bpb33 *b33; 476 struct byte_bpb50 *b50; 477 struct byte_bpb710 *b710; 478 uint8_t SecPerClust; 479 int ronly, error, BlkPerSec; 480 uint64_t psize; 481 unsigned secsize; 482 u_long fatbytes, fatblocksecs; 483 484 /* Flush out any old buffers remaining from a previous use. */ 485 if ((error = vinvalbuf(devvp, V_SAVE, l->l_cred, l, 0, 0)) != 0) 486 return (error); 487 488 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 489 490 bp = NULL; /* both used in error_exit */ 491 pmp = NULL; 492 493 error = fstrans_mount(mp); 494 if (error) 495 goto error_exit; 496 497 error = getdisksize(devvp, &psize, &secsize); 498 if (error) { 499 if (argp->flags & MSDOSFSMNT_GEMDOSFS) 500 goto error_exit; 501 502 /* ok, so it failed. we most likely don't need the info */ 503 secsize = DEV_BSIZE; 504 psize = 0; 505 error = 0; 506 } 507 if (secsize < DEV_BSIZE) { 508 DPRINTF(("Invalid block secsize (%d < DEV_BSIZE)", secsize)); 509 error = EINVAL; 510 goto error_exit; 511 } 512 513 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 514 if (secsize != GEMDOSFS_BSIZE) { 515 DPRINTF(("Invalid block secsize %d for GEMDOS\n", secsize)); 516 error = EINVAL; 517 goto error_exit; 518 } 519 } 520 521 /* 522 * Read the boot sector of the filesystem, and then check the 523 * boot signature. If not a dos boot sector then error out. 524 */ 525 if ((error = bread(devvp, 0, secsize, NOCRED, 0, &bp)) != 0) 526 goto error_exit; 527 bsp = (union bootsector *)bp->b_data; 528 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 529 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 530 b710 = (struct byte_bpb710 *)bsp->bs710.bsBPB; 531 532 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 533 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 534 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 535 DPRINTF(("bootsig0 %d bootsig1 %d\n", 536 bsp->bs50.bsBootSectSig0, 537 bsp->bs50.bsBootSectSig1)); 538 error = EINVAL; 539 goto error_exit; 540 } 541 } 542 543 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK); 544 memset(pmp, 0, sizeof *pmp); 545 pmp->pm_mountp = mp; 546 547 /* 548 * Compute several useful quantities from the bpb in the 549 * bootsector. Copy in the dos 5 variant of the bpb then fix up 550 * the fields that are different between dos 5 and dos 3.3. 551 */ 552 SecPerClust = b50->bpbSecPerClust; 553 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 554 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 555 pmp->pm_FATs = b50->bpbFATs; 556 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 557 pmp->pm_Sectors = getushort(b50->bpbSectors); 558 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 559 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 560 pmp->pm_Heads = getushort(b50->bpbHeads); 561 pmp->pm_Media = b50->bpbMedia; 562 563 if (pmp->pm_Sectors == 0) { 564 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 565 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 566 } else { 567 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 568 pmp->pm_HugeSectors = pmp->pm_Sectors; 569 } 570 571 /* 572 * Sanity checks, from the FAT specification: 573 * - sectors per cluster: >= 1, power of 2 574 * - logical sector size: >= 1, power of 2 575 * - cluster size: <= max FS block size 576 * - number of sectors: >= 1 577 */ 578 if ((SecPerClust == 0) || !powerof2(SecPerClust) || 579 (pmp->pm_BytesPerSec == 0) || !powerof2(pmp->pm_BytesPerSec) || 580 (SecPerClust * pmp->pm_BytesPerSec > MAXBSIZE) || 581 (pmp->pm_HugeSectors == 0)) { 582 DPRINTF(("consistency checks\n")); 583 error = EINVAL; 584 goto error_exit; 585 } 586 587 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS) && 588 (pmp->pm_SecPerTrack > 63)) { 589 DPRINTF(("SecPerTrack %d\n", pmp->pm_SecPerTrack)); 590 error = EINVAL; 591 goto error_exit; 592 } 593 594 if (pmp->pm_RootDirEnts == 0) { 595 unsigned short vers = getushort(b710->bpbFSVers); 596 /* 597 * Some say that bsBootSectSig[23] must be zero, but 598 * Windows does not require this and some digital cameras 599 * do not set these to zero. Therefore, do not insist. 600 */ 601 if (pmp->pm_Sectors || pmp->pm_FATsecs || vers) { 602 DPRINTF(("sectors %d fatsecs %lu vers %d\n", 603 pmp->pm_Sectors, pmp->pm_FATsecs, vers)); 604 error = EINVAL; 605 goto error_exit; 606 } 607 pmp->pm_fatmask = FAT32_MASK; 608 pmp->pm_fatmult = 4; 609 pmp->pm_fatdiv = 1; 610 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 611 612 /* mirrorring is enabled if the FATMIRROR bit is not set */ 613 if ((getushort(b710->bpbExtFlags) & FATMIRROR) == 0) 614 pmp->pm_flags |= MSDOSFS_FATMIRROR; 615 else 616 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 617 } else 618 pmp->pm_flags |= MSDOSFS_FATMIRROR; 619 620 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 621 if (FAT32(pmp)) { 622 DPRINTF(("fat32 for gemdos\n")); 623 /* 624 * GEMDOS doesn't know fat32. 625 */ 626 error = EINVAL; 627 goto error_exit; 628 } 629 630 /* 631 * Check a few values (could do some more): 632 * - logical sector size: >= block size 633 * - number of sectors: <= size of partition 634 */ 635 if ((pmp->pm_BytesPerSec < GEMDOSFS_BSIZE) || 636 (pmp->pm_HugeSectors * 637 (pmp->pm_BytesPerSec / GEMDOSFS_BSIZE) > psize)) { 638 DPRINTF(("consistency checks for gemdos\n")); 639 error = EINVAL; 640 goto error_exit; 641 } 642 /* 643 * XXX - Many parts of the msdos fs driver seem to assume that 644 * the number of bytes per logical sector (BytesPerSec) will 645 * always be the same as the number of bytes per disk block 646 * Let's pretend it is. 647 */ 648 BlkPerSec = pmp->pm_BytesPerSec / GEMDOSFS_BSIZE; 649 pmp->pm_BytesPerSec = GEMDOSFS_BSIZE; 650 pmp->pm_HugeSectors *= BlkPerSec; 651 pmp->pm_HiddenSects *= BlkPerSec; 652 pmp->pm_ResSectors *= BlkPerSec; 653 pmp->pm_Sectors *= BlkPerSec; 654 pmp->pm_FATsecs *= BlkPerSec; 655 SecPerClust *= BlkPerSec; 656 } 657 658 /* Check that fs has nonzero FAT size */ 659 if (pmp->pm_FATsecs == 0) { 660 DPRINTF(("FATsecs is 0\n")); 661 error = EINVAL; 662 goto error_exit; 663 } 664 665 pmp->pm_fatblk = pmp->pm_ResSectors; 666 if (FAT32(pmp)) { 667 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 668 pmp->pm_firstcluster = pmp->pm_fatblk 669 + (pmp->pm_FATs * pmp->pm_FATsecs); 670 pmp->pm_fsinfo = getushort(b710->bpbFSInfo); 671 } else { 672 pmp->pm_rootdirblk = pmp->pm_fatblk + 673 (pmp->pm_FATs * pmp->pm_FATsecs); 674 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 675 + pmp->pm_BytesPerSec - 1) 676 / pmp->pm_BytesPerSec;/* in sectors */ 677 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 678 } 679 680 pmp->pm_nmbrofclusters = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 681 SecPerClust; 682 pmp->pm_maxcluster = pmp->pm_nmbrofclusters + 1; 683 pmp->pm_fatsize = pmp->pm_FATsecs * pmp->pm_BytesPerSec; 684 685 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 686 if (pmp->pm_nmbrofclusters <= (0xff0 - 2)) { 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 } else if (pmp->pm_fatmask == 0) { 696 if (pmp->pm_maxcluster 697 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 698 /* 699 * This will usually be a floppy disk. This size makes 700 * sure that one fat entry will not be split across 701 * multiple blocks. 702 */ 703 pmp->pm_fatmask = FAT12_MASK; 704 pmp->pm_fatmult = 3; 705 pmp->pm_fatdiv = 2; 706 } else { 707 pmp->pm_fatmask = FAT16_MASK; 708 pmp->pm_fatmult = 2; 709 pmp->pm_fatdiv = 1; 710 } 711 } 712 713 /* validate cluster count against FAT */ 714 if ((pmp->pm_maxcluster & pmp->pm_fatmask) != pmp->pm_maxcluster) { 715 DPRINTF("maxcluster %lu outside of mask %#lx\n", 716 pmp->pm_maxcluster, pmp->pm_fatmask); 717 error = EINVAL; 718 goto error_exit; 719 } 720 721 /* validate FAT size */ 722 fatbytes = (pmp->pm_maxcluster+1) * pmp->pm_fatmult / pmp->pm_fatdiv; 723 fatblocksecs = howmany(fatbytes, pmp->pm_BytesPerSec); 724 725 if (pmp->pm_FATsecs != fatblocksecs) { 726 DPRINTF("FATsecs %lu != real %lu\n", pmp->pm_FATsecs, 727 fatblocksecs); 728 error = EINVAL; 729 goto error_exit; 730 } 731 732 if (FAT12(pmp)) { 733 /* 734 * limit block size to what is needed to read a FAT block 735 * to not exceed MAXBSIZE 736 */ 737 pmp->pm_fatblocksec = min(3, fatblocksecs); 738 pmp->pm_fatblocksize = pmp->pm_fatblocksec 739 * pmp->pm_BytesPerSec; 740 } else { 741 pmp->pm_fatblocksize = MAXBSIZE; 742 pmp->pm_fatblocksec = pmp->pm_fatblocksize 743 / pmp->pm_BytesPerSec; 744 } 745 746 pmp->pm_bnshift = ffs(pmp->pm_BytesPerSec) - 1; 747 748 /* 749 * Compute mask and shift value for isolating cluster relative byte 750 * offsets and cluster numbers from a file offset. 751 */ 752 pmp->pm_bpcluster = SecPerClust * pmp->pm_BytesPerSec; 753 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 754 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 755 756 /* 757 * Check for valid cluster size 758 * must be a power of 2 759 */ 760 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 761 DPRINTF(("bpcluster %lu cnshift %lu\n", 762 pmp->pm_bpcluster, pmp->pm_cnshift)); 763 error = EINVAL; 764 goto error_exit; 765 } 766 767 /* 768 * Release the bootsector buffer. 769 */ 770 brelse(bp, BC_AGE); 771 bp = NULL; 772 773 /* 774 * Check FSInfo. 775 */ 776 if (pmp->pm_fsinfo) { 777 struct fsinfo *fp; 778 779 /* 780 * XXX If the fsinfo block is stored on media with 781 * 2KB or larger sectors, is the fsinfo structure 782 * padded at the end or in the middle? 783 */ 784 if ((error = bread(devvp, de_bn2kb(pmp, pmp->pm_fsinfo), 785 pmp->pm_BytesPerSec, NOCRED, 0, &bp)) != 0) 786 goto error_exit; 787 fp = (struct fsinfo *)bp->b_data; 788 if (!memcmp(fp->fsisig1, "RRaA", 4) 789 && !memcmp(fp->fsisig2, "rrAa", 4) 790 && !memcmp(fp->fsisig3, "\0\0\125\252", 4) 791 && !memcmp(fp->fsisig4, "\0\0\125\252", 4)) 792 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 793 else 794 pmp->pm_fsinfo = 0; 795 brelse(bp, 0); 796 bp = NULL; 797 } 798 799 /* 800 * Check and validate (or perhaps invalidate?) the fsinfo structure? 801 * XXX 802 */ 803 if (pmp->pm_fsinfo) { 804 if (pmp->pm_nxtfree == (u_long)-1) 805 pmp->pm_fsinfo = 0; 806 } 807 808 /* 809 * Allocate memory for the bitmap of allocated clusters, and then 810 * fill it in. 811 */ 812 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 813 / N_INUSEBITS) 814 * sizeof(*pmp->pm_inusemap), 815 M_MSDOSFSFAT, M_WAITOK); 816 817 /* 818 * fillinusemap() needs pm_devvp. 819 */ 820 pmp->pm_dev = dev; 821 pmp->pm_devvp = devvp; 822 823 /* 824 * Have the inuse map filled in. 825 */ 826 if ((error = fillinusemap(pmp)) != 0) { 827 DPRINTF(("fillinusemap %d\n", error)); 828 goto error_exit; 829 } 830 831 /* 832 * If they want fat updates to be synchronous then let them suffer 833 * the performance degradation in exchange for the on disk copy of 834 * the fat being correct just about all the time. I suppose this 835 * would be a good thing to turn on if the kernel is still flakey. 836 */ 837 if (mp->mnt_flag & MNT_SYNCHRONOUS) 838 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 839 840 /* 841 * Finish up. 842 */ 843 if (ronly) 844 pmp->pm_flags |= MSDOSFSMNT_RONLY; 845 else 846 pmp->pm_fmod = 1; 847 mp->mnt_data = pmp; 848 mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev; 849 mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_MSDOS); 850 mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; 851 mp->mnt_stat.f_namemax = MSDOSFS_NAMEMAX(pmp); 852 mp->mnt_flag |= MNT_LOCAL; 853 mp->mnt_dev_bshift = pmp->pm_bnshift; 854 mp->mnt_fs_bshift = pmp->pm_cnshift; 855 856 /* 857 * If we ever do quotas for DOS filesystems this would be a place 858 * to fill in the info in the msdosfsmount structure. You dolt, 859 * quotas on dos filesystems make no sense because files have no 860 * owners on dos filesystems. of course there is some empty space 861 * in the directory entry where we could put uid's and gid's. 862 */ 863 864 devvp->v_specmountpoint = mp; 865 866 return (0); 867 868 error_exit: 869 fstrans_unmount(mp); 870 if (bp) 871 brelse(bp, BC_AGE); 872 if (pmp) { 873 if (pmp->pm_inusemap) 874 free(pmp->pm_inusemap, M_MSDOSFSFAT); 875 free(pmp, M_MSDOSFSMNT); 876 mp->mnt_data = NULL; 877 } 878 return (error); 879 } 880 881 int 882 msdosfs_start(struct mount *mp, int flags) 883 { 884 885 return (0); 886 } 887 888 /* 889 * Unmount the filesystem described by mp. 890 */ 891 int 892 msdosfs_unmount(struct mount *mp, int mntflags) 893 { 894 struct msdosfsmount *pmp; 895 int error, flags; 896 897 flags = 0; 898 if (mntflags & MNT_FORCE) 899 flags |= FORCECLOSE; 900 if ((error = vflush(mp, NULLVP, flags)) != 0) 901 return (error); 902 pmp = VFSTOMSDOSFS(mp); 903 if (pmp->pm_devvp->v_type != VBAD) 904 pmp->pm_devvp->v_specmountpoint = NULL; 905 #ifdef MSDOSFS_DEBUG 906 { 907 struct vnode *vp = pmp->pm_devvp; 908 909 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 910 printf("flag %08x, usecount %d, writecount %d, holdcnt %d\n", 911 vp->v_vflag | vp->v_iflag | vp->v_uflag, vp->v_usecount, 912 vp->v_writecount, vp->v_holdcnt); 913 printf("mount %p, op %p\n", 914 vp->v_mount, vp->v_op); 915 printf("freef %p, freeb %p, mount %p\n", 916 vp->v_freelist.tqe_next, vp->v_freelist.tqe_prev, 917 vp->v_mount); 918 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %d, type %d\n", 919 vp->v_cleanblkhd.lh_first, 920 vp->v_dirtyblkhd.lh_first, 921 vp->v_numoutput, vp->v_type); 922 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 923 vp->v_socket, vp->v_tag, 924 ((u_int *)vp->v_data)[0], 925 ((u_int *)vp->v_data)[1]); 926 } 927 #endif 928 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY); 929 (void) VOP_CLOSE(pmp->pm_devvp, 930 pmp->pm_flags & MSDOSFSMNT_RONLY ? FREAD : FREAD|FWRITE, NOCRED); 931 vput(pmp->pm_devvp); 932 msdosfs_fh_destroy(pmp); 933 free(pmp->pm_inusemap, M_MSDOSFSFAT); 934 free(pmp, M_MSDOSFSMNT); 935 mp->mnt_data = NULL; 936 mp->mnt_flag &= ~MNT_LOCAL; 937 fstrans_unmount(mp); 938 return (0); 939 } 940 941 int 942 msdosfs_root(struct mount *mp, struct vnode **vpp) 943 { 944 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 945 struct denode *ndep; 946 int error; 947 948 #ifdef MSDOSFS_DEBUG 949 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 950 #endif 951 if ((error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep)) != 0) 952 return (error); 953 *vpp = DETOV(ndep); 954 return (0); 955 } 956 957 int 958 msdosfs_statvfs(struct mount *mp, struct statvfs *sbp) 959 { 960 struct msdosfsmount *pmp; 961 962 pmp = VFSTOMSDOSFS(mp); 963 sbp->f_bsize = pmp->pm_bpcluster; 964 sbp->f_frsize = sbp->f_bsize; 965 sbp->f_iosize = pmp->pm_bpcluster; 966 sbp->f_blocks = pmp->pm_nmbrofclusters; 967 sbp->f_bfree = pmp->pm_freeclustercount; 968 sbp->f_bavail = pmp->pm_freeclustercount; 969 sbp->f_bresvd = 0; 970 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 971 sbp->f_ffree = 0; /* what to put in here? */ 972 sbp->f_favail = 0; /* what to put in here? */ 973 sbp->f_fresvd = 0; 974 copy_statvfs_info(sbp, mp); 975 return (0); 976 } 977 978 int 979 msdosfs_sync(struct mount *mp, int waitfor, kauth_cred_t cred) 980 { 981 struct vnode *vp, *mvp; 982 struct denode *dep; 983 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 984 int error, allerror = 0; 985 986 /* 987 * If we ever switch to not updating all of the fats all the time, 988 * this would be the place to update them from the first one. 989 */ 990 if (pmp->pm_fmod != 0) { 991 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 992 panic("msdosfs_sync: rofs mod"); 993 else { 994 /* update fats here */ 995 } 996 } 997 /* Allocate a marker vnode. */ 998 mvp = vnalloc(mp); 999 fstrans_start(mp, FSTRANS_SHARED); 1000 /* 1001 * Write back each (modified) denode. 1002 */ 1003 mutex_enter(&mntvnode_lock); 1004 loop: 1005 for (vp = TAILQ_FIRST(&mp->mnt_vnodelist); vp; vp = vunmark(mvp)) { 1006 vmark(mvp, vp); 1007 if (vp->v_mount != mp || vismarker(vp)) 1008 continue; 1009 mutex_enter(vp->v_interlock); 1010 dep = VTODE(vp); 1011 if (waitfor == MNT_LAZY || vp->v_type == VNON || 1012 dep == NULL || (((dep->de_flag & 1013 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0) && 1014 (LIST_EMPTY(&vp->v_dirtyblkhd) && 1015 UVM_OBJ_IS_CLEAN(&vp->v_uobj)))) { 1016 mutex_exit(vp->v_interlock); 1017 continue; 1018 } 1019 mutex_exit(&mntvnode_lock); 1020 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT); 1021 if (error) { 1022 mutex_enter(&mntvnode_lock); 1023 if (error == ENOENT) { 1024 (void)vunmark(mvp); 1025 goto loop; 1026 } 1027 continue; 1028 } 1029 if ((error = VOP_FSYNC(vp, cred, 1030 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0)) != 0) 1031 allerror = error; 1032 vput(vp); 1033 mutex_enter(&mntvnode_lock); 1034 } 1035 mutex_exit(&mntvnode_lock); 1036 vnfree(mvp); 1037 1038 /* 1039 * Force stale file system control information to be flushed. 1040 */ 1041 if ((error = VOP_FSYNC(pmp->pm_devvp, cred, 1042 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0)) != 0) 1043 allerror = error; 1044 fstrans_done(mp); 1045 return (allerror); 1046 } 1047 1048 int 1049 msdosfs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) 1050 { 1051 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 1052 struct defid defh; 1053 struct denode *dep; 1054 uint32_t gen; 1055 int error; 1056 1057 if (fhp->fid_len != sizeof(struct defid)) { 1058 DPRINTF(("fid_len %d %zd\n", fhp->fid_len, 1059 sizeof(struct defid))); 1060 return EINVAL; 1061 } 1062 memcpy(&defh, fhp, sizeof(defh)); 1063 error = msdosfs_fh_lookup(pmp, defh.defid_dirclust, defh.defid_dirofs, 1064 &gen); 1065 if (error == 0 && gen != defh.defid_gen) 1066 error = ESTALE; 1067 if (error) { 1068 *vpp = NULLVP; 1069 return error; 1070 } 1071 error = deget(pmp, defh.defid_dirclust, defh.defid_dirofs, &dep); 1072 if (error) { 1073 DPRINTF(("deget %d\n", error)); 1074 *vpp = NULLVP; 1075 return (error); 1076 } 1077 *vpp = DETOV(dep); 1078 return (0); 1079 } 1080 1081 int 1082 msdosfs_vptofh(struct vnode *vp, struct fid *fhp, size_t *fh_size) 1083 { 1084 struct msdosfsmount *pmp = VFSTOMSDOSFS(vp->v_mount); 1085 struct denode *dep; 1086 struct defid defh; 1087 int error; 1088 1089 if (*fh_size < sizeof(struct defid)) { 1090 *fh_size = sizeof(struct defid); 1091 return E2BIG; 1092 } 1093 *fh_size = sizeof(struct defid); 1094 dep = VTODE(vp); 1095 memset(&defh, 0, sizeof(defh)); 1096 defh.defid_len = sizeof(struct defid); 1097 defh.defid_dirclust = dep->de_dirclust; 1098 defh.defid_dirofs = dep->de_diroffset; 1099 error = msdosfs_fh_enter(pmp, dep->de_dirclust, dep->de_diroffset, 1100 &defh.defid_gen); 1101 if (error == 0) 1102 memcpy(fhp, &defh, sizeof(defh)); 1103 return error; 1104 } 1105 1106 int 1107 msdosfs_vget(struct mount *mp, ino_t ino, 1108 struct vnode **vpp) 1109 { 1110 1111 return (EOPNOTSUPP); 1112 } 1113 1114 int 1115 msdosfs_suspendctl(struct mount *mp, int cmd) 1116 { 1117 int error; 1118 struct lwp *l = curlwp; 1119 1120 switch (cmd) { 1121 case SUSPEND_SUSPEND: 1122 if ((error = fstrans_setstate(mp, FSTRANS_SUSPENDING)) != 0) 1123 return error; 1124 error = msdosfs_sync(mp, MNT_WAIT, l->l_proc->p_cred); 1125 if (error == 0) 1126 error = fstrans_setstate(mp, FSTRANS_SUSPENDED); 1127 if (error != 0) { 1128 (void) fstrans_setstate(mp, FSTRANS_NORMAL); 1129 return error; 1130 } 1131 return 0; 1132 1133 case SUSPEND_RESUME: 1134 return fstrans_setstate(mp, FSTRANS_NORMAL); 1135 1136 default: 1137 return EINVAL; 1138 } 1139 } 1140
Indexes created Thu Oct 23 22:10:10 GMT 2025