msdosfs_vfsops.c revision 1.68.6.3
1 /* $NetBSD: msdosfs_vfsops.c,v 1.68.6.3 2014/04/25 15:43:50 sborrill 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 1.68.6.3 2014/04/25 15:43:50 sborrill Exp $"); 52 53 #if defined(_KERNEL_OPT) 54 #include "opt_quota.h" 55 #include "opt_compat_netbsd.h" 56 #endif 57 58 #include <sys/param.h> 59 #include <sys/systm.h> 60 #include <sys/sysctl.h> 61 #include <sys/namei.h> 62 #include <sys/proc.h> 63 #include <sys/kernel.h> 64 #include <sys/vnode.h> 65 #include <miscfs/genfs/genfs.h> 66 #include <miscfs/specfs/specdev.h> /* XXX */ /* defines v_rdev */ 67 #include <sys/mount.h> 68 #include <sys/buf.h> 69 #include <sys/file.h> 70 #include <sys/device.h> 71 #include <sys/disklabel.h> 72 #include <sys/disk.h> 73 #include <sys/ioctl.h> 74 #include <sys/malloc.h> 75 #include <sys/dirent.h> 76 #include <sys/stat.h> 77 #include <sys/conf.h> 78 #include <sys/kauth.h> 79 #include <sys/module.h> 80 81 #include <fs/msdosfs/bpb.h> 82 #include <fs/msdosfs/bootsect.h> 83 #include <fs/msdosfs/direntry.h> 84 #include <fs/msdosfs/denode.h> 85 #include <fs/msdosfs/msdosfsmount.h> 86 #include <fs/msdosfs/fat.h> 87 88 MODULE(MODULE_CLASS_VFS, msdosfs, NULL); 89 90 #ifdef MSDOSFS_DEBUG 91 #define DPRINTF(a) uprintf a 92 #else 93 #define DPRINTF(a) 94 #endif 95 96 #define MSDOSFS_NAMEMAX(pmp) \ 97 (pmp)->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12 98 99 VFS_PROTOS(msdosfs); 100 101 int msdosfs_mountfs(struct vnode *, struct mount *, struct lwp *, 102 struct msdosfs_args *); 103 104 static int update_mp(struct mount *, struct msdosfs_args *); 105 106 MALLOC_JUSTDEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOS FS mount structure"); 107 MALLOC_JUSTDEFINE(M_MSDOSFSFAT, "MSDOSFS fat", "MSDOS FS fat table"); 108 MALLOC_JUSTDEFINE(M_MSDOSFSTMP, "MSDOSFS temp", "MSDOS FS temp. structures"); 109 110 #define ROOTNAME "root_device" 111 112 static struct sysctllog *msdosfs_sysctl_log; 113 114 extern const struct vnodeopv_desc msdosfs_vnodeop_opv_desc; 115 116 const struct vnodeopv_desc * const msdosfs_vnodeopv_descs[] = { 117 &msdosfs_vnodeop_opv_desc, 118 NULL, 119 }; 120 121 struct vfsops msdosfs_vfsops = { 122 MOUNT_MSDOS, 123 sizeof (struct msdosfs_args), 124 msdosfs_mount, 125 msdosfs_start, 126 msdosfs_unmount, 127 msdosfs_root, 128 (void *)eopnotsupp, /* vfs_quotactl */ 129 msdosfs_statvfs, 130 msdosfs_sync, 131 msdosfs_vget, 132 msdosfs_fhtovp, 133 msdosfs_vptofh, 134 msdosfs_init, 135 msdosfs_reinit, 136 msdosfs_done, 137 msdosfs_mountroot, 138 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 139 vfs_stdextattrctl, 140 (void *)eopnotsupp, /* vfs_suspendctl */ 141 genfs_renamelock_enter, 142 genfs_renamelock_exit, 143 (void *)eopnotsupp, 144 msdosfs_vnodeopv_descs, 145 0, 146 { NULL, NULL }, 147 }; 148 149 static int 150 msdosfs_modcmd(modcmd_t cmd, void *arg) 151 { 152 int error; 153 154 switch (cmd) { 155 case MODULE_CMD_INIT: 156 error = vfs_attach(&msdosfs_vfsops); 157 if (error != 0) 158 break; 159 sysctl_createv(&msdosfs_sysctl_log, 0, NULL, NULL, 160 CTLFLAG_PERMANENT, 161 CTLTYPE_NODE, "vfs", NULL, 162 NULL, 0, NULL, 0, 163 CTL_VFS, CTL_EOL); 164 sysctl_createv(&msdosfs_sysctl_log, 0, NULL, NULL, 165 CTLFLAG_PERMANENT, 166 CTLTYPE_NODE, "msdosfs", 167 SYSCTL_DESCR("MS-DOS file system"), 168 NULL, 0, NULL, 0, 169 CTL_VFS, 4, CTL_EOL); 170 /* 171 * XXX the "4" above could be dynamic, thereby eliminating one 172 * more instance of the "number to vfs" mapping problem, but 173 * "4" is the order as taken from sys/mount.h 174 */ 175 break; 176 case MODULE_CMD_FINI: 177 error = vfs_detach(&msdosfs_vfsops); 178 if (error != 0) 179 break; 180 sysctl_teardown(&msdosfs_sysctl_log); 181 break; 182 default: 183 error = ENOTTY; 184 break; 185 } 186 187 return (error); 188 } 189 190 static int 191 update_mp(mp, argp) 192 struct mount *mp; 193 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() 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(mp, path, data, data_len) 289 struct mount *mp; 290 const char *path; 291 void *data; 292 size_t *data_len; 293 { 294 struct lwp *l = curlwp; 295 struct nameidata nd; 296 struct vnode *devvp; /* vnode for blk device to mount */ 297 struct msdosfs_args *args = data; /* holds data from mount request */ 298 /* msdosfs specific mount control block */ 299 struct msdosfsmount *pmp = NULL; 300 int error, flags; 301 mode_t accessmode; 302 303 if (args == NULL) 304 return EINVAL; 305 if (*data_len < sizeof *args) 306 return EINVAL; 307 308 if (mp->mnt_flag & MNT_GETARGS) { 309 pmp = VFSTOMSDOSFS(mp); 310 if (pmp == NULL) 311 return EIO; 312 args->fspec = NULL; 313 args->uid = pmp->pm_uid; 314 args->gid = pmp->pm_gid; 315 args->mask = pmp->pm_mask; 316 args->flags = pmp->pm_flags; 317 args->version = MSDOSFSMNT_VERSION; 318 args->dirmask = pmp->pm_dirmask; 319 args->gmtoff = pmp->pm_gmtoff; 320 *data_len = sizeof *args; 321 return 0; 322 } 323 324 /* 325 * If not versioned (i.e. using old mount_msdos(8)), fill in 326 * the additional structure items with suitable defaults. 327 */ 328 if ((args->flags & MSDOSFSMNT_VERSIONED) == 0) { 329 args->version = 1; 330 args->dirmask = args->mask; 331 } 332 333 /* 334 * Reset GMT offset for pre-v3 mount structure args. 335 */ 336 if (args->version < 3) 337 args->gmtoff = 0; 338 339 /* 340 * If updating, check whether changing from read-only to 341 * read/write; if there is no device name, that's all we do. 342 */ 343 if (mp->mnt_flag & MNT_UPDATE) { 344 pmp = VFSTOMSDOSFS(mp); 345 error = 0; 346 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_RDONLY)) { 347 flags = WRITECLOSE; 348 if (mp->mnt_flag & MNT_FORCE) 349 flags |= FORCECLOSE; 350 error = vflush(mp, NULLVP, flags); 351 } 352 if (!error && (mp->mnt_flag & MNT_RELOAD)) 353 /* not yet implemented */ 354 error = EOPNOTSUPP; 355 if (error) { 356 DPRINTF(("vflush %d\n", error)); 357 return (error); 358 } 359 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_iflag & IMNT_WANTRDWR)) { 360 /* 361 * If upgrade to read-write by non-root, then verify 362 * that user has necessary permissions on the device. 363 */ 364 if (kauth_authorize_generic(l->l_cred, 365 KAUTH_GENERIC_ISSUSER, NULL) != 0) { 366 devvp = pmp->pm_devvp; 367 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 368 error = VOP_ACCESS(devvp, VREAD | VWRITE, 369 l->l_cred); 370 VOP_UNLOCK(devvp, 0); 371 DPRINTF(("VOP_ACCESS %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 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, args->fspec); 387 if ((error = namei(&nd)) != 0) { 388 DPRINTF(("namei %d\n", error)); 389 return (error); 390 } 391 devvp = nd.ni_vp; 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 if (kauth_authorize_generic(l->l_cred, KAUTH_GENERIC_ISSUSER, NULL) != 0) { 408 accessmode = VREAD; 409 if ((mp->mnt_flag & MNT_RDONLY) == 0) 410 accessmode |= VWRITE; 411 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 412 error = VOP_ACCESS(devvp, accessmode, l->l_cred); 413 VOP_UNLOCK(devvp, 0); 414 if (error) { 415 DPRINTF(("VOP_ACCESS2 %d\n", error)); 416 vrele(devvp); 417 return (error); 418 } 419 } 420 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 421 int xflags; 422 423 if (mp->mnt_flag & MNT_RDONLY) 424 xflags = FREAD; 425 else 426 xflags = FREAD|FWRITE; 427 error = VOP_OPEN(devvp, xflags, FSCRED); 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, 0); 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(devvp, mp, l, argp) 470 struct vnode *devvp; 471 struct mount *mp; 472 struct lwp *l; 473 struct msdosfs_args *argp; 474 { 475 struct msdosfsmount *pmp; 476 struct buf *bp; 477 dev_t dev = devvp->v_rdev; 478 struct partinfo dpart; 479 union bootsector *bsp; 480 struct byte_bpb33 *b33; 481 struct byte_bpb50 *b50; 482 struct byte_bpb710 *b710; 483 u_int8_t SecPerClust; 484 int ronly, error, tmp; 485 int bsize, dtype, fstype, secsize; 486 u_int64_t psize; 487 488 /* Flush out any old buffers remaining from a previous use. */ 489 if ((error = vinvalbuf(devvp, V_SAVE, l->l_cred, l, 0, 0)) != 0) 490 return (error); 491 492 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 493 494 bp = NULL; /* both used in error_exit */ 495 pmp = NULL; 496 497 /* 498 * We need the disklabel to calculate the size of a FAT entry 499 * later on. Also make sure the partition contains a filesystem 500 * of type FS_MSDOS. This doesn't work for floppies, so we have 501 * to check for them too. 502 * 503 * There might still be parts of the msdos fs driver which assume 504 * that the size of a disk block will always be 512 bytes. 505 * Let's root them out... 506 */ 507 error = VOP_IOCTL(devvp, DIOCGPART, &dpart, FREAD, NOCRED); 508 if (error == 0) { 509 secsize = dpart.disklab->d_secsize; 510 dtype = dpart.disklab->d_type; 511 fstype = dpart.part->p_fstype; 512 psize = dpart.part->p_size; 513 } else { 514 struct dkwedge_info dkw; 515 error = VOP_IOCTL(devvp, DIOCGWEDGEINFO, &dkw, FREAD, NOCRED); 516 secsize = 512; /* XXX */ 517 dtype = DTYPE_FLOPPY; /* XXX */ 518 fstype = FS_MSDOS; 519 psize = -1; 520 if (error) { 521 if (error != ENOTTY) { 522 DPRINTF(("Error getting partition info %d\n", 523 error)); 524 goto error_exit; 525 } 526 } else { 527 fstype = strcmp(dkw.dkw_ptype, DKW_PTYPE_FAT) == 0 ? 528 FS_MSDOS : -1; 529 psize = dkw.dkw_size; 530 } 531 } 532 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 533 bsize = secsize; 534 if (bsize != 512) { 535 DPRINTF(("bsize %d dtype %d fstype %d\n", bsize, dtype, 536 fstype)); 537 error = EINVAL; 538 goto error_exit; 539 } 540 } else 541 bsize = 0; 542 543 /* 544 * Read the boot sector of the filesystem, and then check the 545 * boot signature. If not a dos boot sector then error out. 546 */ 547 if ((error = bread(devvp, 0, secsize, NOCRED, 0, &bp)) != 0) 548 goto error_exit; 549 bsp = (union bootsector *)bp->b_data; 550 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 551 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 552 b710 = (struct byte_bpb710 *)bsp->bs710.bsBPB; 553 554 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 555 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 556 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 557 DPRINTF(("bootsig0 %d bootsig1 %d\n", 558 bsp->bs50.bsBootSectSig0, 559 bsp->bs50.bsBootSectSig1)); 560 error = EINVAL; 561 goto error_exit; 562 } 563 } 564 565 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK); 566 memset(pmp, 0, sizeof *pmp); 567 pmp->pm_mountp = mp; 568 569 /* 570 * Compute several useful quantities from the bpb in the 571 * bootsector. Copy in the dos 5 variant of the bpb then fix up 572 * the fields that are different between dos 5 and dos 3.3. 573 */ 574 SecPerClust = b50->bpbSecPerClust; 575 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 576 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 577 pmp->pm_FATs = b50->bpbFATs; 578 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 579 pmp->pm_Sectors = getushort(b50->bpbSectors); 580 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 581 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 582 pmp->pm_Heads = getushort(b50->bpbHeads); 583 pmp->pm_Media = b50->bpbMedia; 584 585 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 586 /* XXX - We should probably check more values here */ 587 if (!pmp->pm_BytesPerSec || !SecPerClust 588 || pmp->pm_SecPerTrack > 63) { 589 DPRINTF(("bytespersec %d secperclust %d " 590 "secpertrack %d\n", 591 pmp->pm_BytesPerSec, SecPerClust, 592 pmp->pm_SecPerTrack)); 593 error = EINVAL; 594 goto error_exit; 595 } 596 } 597 598 if (pmp->pm_Sectors == 0) { 599 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 600 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 601 } else { 602 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 603 pmp->pm_HugeSectors = pmp->pm_Sectors; 604 } 605 606 if (pmp->pm_RootDirEnts == 0) { 607 unsigned short vers = getushort(b710->bpbFSVers); 608 /* 609 * Some say that bsBootSectSig[23] must be zero, but 610 * Windows does not require this and some digital cameras 611 * do not set these to zero. Therefore, do not insist. 612 */ 613 if (pmp->pm_Sectors || pmp->pm_FATsecs || vers) { 614 DPRINTF(("sectors %d fatsecs %lu vers %d\n", 615 pmp->pm_Sectors, pmp->pm_FATsecs, vers)); 616 error = EINVAL; 617 goto error_exit; 618 } 619 pmp->pm_fatmask = FAT32_MASK; 620 pmp->pm_fatmult = 4; 621 pmp->pm_fatdiv = 1; 622 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 623 624 /* mirrorring is enabled if the FATMIRROR bit is not set */ 625 if ((getushort(b710->bpbExtFlags) & FATMIRROR) == 0) 626 pmp->pm_flags |= MSDOSFS_FATMIRROR; 627 else 628 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 629 } else 630 pmp->pm_flags |= MSDOSFS_FATMIRROR; 631 632 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 633 if (FAT32(pmp)) { 634 DPRINTF(("fat32 for gemdos\n")); 635 /* 636 * GEMDOS doesn't know fat32. 637 */ 638 error = EINVAL; 639 goto error_exit; 640 } 641 642 /* 643 * Check a few values (could do some more): 644 * - logical sector size: power of 2, >= block size 645 * - sectors per cluster: power of 2, >= 1 646 * - number of sectors: >= 1, <= size of partition 647 */ 648 if ( (SecPerClust == 0) 649 || (SecPerClust & (SecPerClust - 1)) 650 || (pmp->pm_BytesPerSec < bsize) 651 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 652 || (pmp->pm_HugeSectors == 0) 653 || (pmp->pm_HugeSectors * (pmp->pm_BytesPerSec / bsize) 654 > psize)) { 655 DPRINTF(("consistency checks for gemdos\n")); 656 error = EINVAL; 657 goto error_exit; 658 } 659 /* 660 * XXX - Many parts of the msdos fs driver seem to assume that 661 * the number of bytes per logical sector (BytesPerSec) will 662 * always be the same as the number of bytes per disk block 663 * Let's pretend it is. 664 */ 665 tmp = pmp->pm_BytesPerSec / bsize; 666 pmp->pm_BytesPerSec = bsize; 667 pmp->pm_HugeSectors *= tmp; 668 pmp->pm_HiddenSects *= tmp; 669 pmp->pm_ResSectors *= tmp; 670 pmp->pm_Sectors *= tmp; 671 pmp->pm_FATsecs *= tmp; 672 SecPerClust *= tmp; 673 } 674 675 /* Check that fs has nonzero FAT size */ 676 if (pmp->pm_FATsecs == 0) { 677 DPRINTF(("FATsecs is 0\n")); 678 error = EINVAL; 679 goto error_exit; 680 } 681 682 pmp->pm_fatblk = pmp->pm_ResSectors; 683 if (FAT32(pmp)) { 684 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 685 pmp->pm_firstcluster = pmp->pm_fatblk 686 + (pmp->pm_FATs * pmp->pm_FATsecs); 687 pmp->pm_fsinfo = getushort(b710->bpbFSInfo); 688 } else { 689 pmp->pm_rootdirblk = pmp->pm_fatblk + 690 (pmp->pm_FATs * pmp->pm_FATsecs); 691 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 692 + pmp->pm_BytesPerSec - 1) 693 / pmp->pm_BytesPerSec;/* in sectors */ 694 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 695 } 696 697 pmp->pm_nmbrofclusters = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 698 SecPerClust; 699 pmp->pm_maxcluster = pmp->pm_nmbrofclusters + 1; 700 pmp->pm_fatsize = pmp->pm_FATsecs * pmp->pm_BytesPerSec; 701 702 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 703 if (pmp->pm_nmbrofclusters <= (0xff0 - 2) 704 && (dtype == DTYPE_FLOPPY 705 || (dtype == DTYPE_VND 706 && (pmp->pm_Heads == 1 || pmp->pm_Heads == 2))) 707 ) { 708 pmp->pm_fatmask = FAT12_MASK; 709 pmp->pm_fatmult = 3; 710 pmp->pm_fatdiv = 2; 711 } else { 712 pmp->pm_fatmask = FAT16_MASK; 713 pmp->pm_fatmult = 2; 714 pmp->pm_fatdiv = 1; 715 } 716 } else if (pmp->pm_fatmask == 0) { 717 if (pmp->pm_maxcluster 718 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 719 /* 720 * This will usually be a floppy disk. This size makes 721 * sure that one fat entry will not be split across 722 * multiple blocks. 723 */ 724 pmp->pm_fatmask = FAT12_MASK; 725 pmp->pm_fatmult = 3; 726 pmp->pm_fatdiv = 2; 727 } else { 728 pmp->pm_fatmask = FAT16_MASK; 729 pmp->pm_fatmult = 2; 730 pmp->pm_fatdiv = 1; 731 } 732 } 733 if (FAT12(pmp)) 734 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 735 else 736 pmp->pm_fatblocksize = MAXBSIZE; 737 738 pmp->pm_fatblocksec = pmp->pm_fatblocksize / pmp->pm_BytesPerSec; 739 pmp->pm_bnshift = ffs(pmp->pm_BytesPerSec) - 1; 740 741 /* 742 * Compute mask and shift value for isolating cluster relative byte 743 * offsets and cluster numbers from a file offset. 744 */ 745 pmp->pm_bpcluster = SecPerClust * pmp->pm_BytesPerSec; 746 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 747 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 748 749 /* 750 * Check for valid cluster size 751 * must be a power of 2 752 */ 753 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 754 DPRINTF(("bpcluster %lu cnshift %lu\n", 755 pmp->pm_bpcluster, pmp->pm_cnshift)); 756 error = EINVAL; 757 goto error_exit; 758 } 759 760 /* 761 * Release the bootsector buffer. 762 */ 763 brelse(bp, BC_AGE); 764 bp = NULL; 765 766 /* 767 * Check FSInfo. 768 */ 769 if (pmp->pm_fsinfo) { 770 struct fsinfo *fp; 771 772 /* 773 * XXX If the fsinfo block is stored on media with 774 * 2KB or larger sectors, is the fsinfo structure 775 * padded at the end or in the middle? 776 */ 777 if ((error = bread(devvp, de_bn2kb(pmp, pmp->pm_fsinfo), 778 pmp->pm_BytesPerSec, NOCRED, 0, &bp)) != 0) 779 goto error_exit; 780 fp = (struct fsinfo *)bp->b_data; 781 if (!memcmp(fp->fsisig1, "RRaA", 4) 782 && !memcmp(fp->fsisig2, "rrAa", 4) 783 && !memcmp(fp->fsisig3, "\0\0\125\252", 4) 784 && !memcmp(fp->fsisig4, "\0\0\125\252", 4)) 785 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 786 else 787 pmp->pm_fsinfo = 0; 788 brelse(bp, 0); 789 bp = NULL; 790 } 791 792 /* 793 * Check and validate (or perhaps invalidate?) the fsinfo structure? 794 * XXX 795 */ 796 if (pmp->pm_fsinfo) { 797 if (pmp->pm_nxtfree == (u_long)-1) 798 pmp->pm_fsinfo = 0; 799 } 800 801 /* 802 * Allocate memory for the bitmap of allocated clusters, and then 803 * fill it in. 804 */ 805 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 806 / N_INUSEBITS) 807 * sizeof(*pmp->pm_inusemap), 808 M_MSDOSFSFAT, M_WAITOK); 809 810 /* 811 * fillinusemap() needs pm_devvp. 812 */ 813 pmp->pm_dev = dev; 814 pmp->pm_devvp = devvp; 815 816 /* 817 * Have the inuse map filled in. 818 */ 819 if ((error = fillinusemap(pmp)) != 0) { 820 DPRINTF(("fillinusemap %d\n", error)); 821 goto error_exit; 822 } 823 824 /* 825 * If they want fat updates to be synchronous then let them suffer 826 * the performance degradation in exchange for the on disk copy of 827 * the fat being correct just about all the time. I suppose this 828 * would be a good thing to turn on if the kernel is still flakey. 829 */ 830 if (mp->mnt_flag & MNT_SYNCHRONOUS) 831 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 832 833 /* 834 * Finish up. 835 */ 836 if (ronly) 837 pmp->pm_flags |= MSDOSFSMNT_RONLY; 838 else 839 pmp->pm_fmod = 1; 840 mp->mnt_data = pmp; 841 mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev; 842 mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_MSDOS); 843 mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; 844 mp->mnt_stat.f_namemax = MSDOSFS_NAMEMAX(pmp); 845 mp->mnt_flag |= MNT_LOCAL; 846 mp->mnt_dev_bshift = pmp->pm_bnshift; 847 mp->mnt_fs_bshift = pmp->pm_cnshift; 848 849 #ifdef QUOTA 850 /* 851 * If we ever do quotas for DOS filesystems this would be a place 852 * to fill in the info in the msdosfsmount structure. You dolt, 853 * quotas on dos filesystems make no sense because files have no 854 * owners on dos filesystems. of course there is some empty space 855 * in the directory entry where we could put uid's and gid's. 856 */ 857 #endif 858 devvp->v_specmountpoint = mp; 859 860 return (0); 861 862 error_exit:; 863 if (bp) 864 brelse(bp, BC_AGE); 865 if (pmp) { 866 if (pmp->pm_inusemap) 867 free(pmp->pm_inusemap, M_MSDOSFSFAT); 868 free(pmp, M_MSDOSFSMNT); 869 mp->mnt_data = NULL; 870 } 871 return (error); 872 } 873 874 int 875 msdosfs_start(struct mount *mp, int flags) 876 { 877 878 return (0); 879 } 880 881 /* 882 * Unmount the filesystem described by mp. 883 */ 884 int 885 msdosfs_unmount(mp, mntflags) 886 struct mount *mp; 887 int mntflags; 888 { 889 struct msdosfsmount *pmp; 890 int error, flags; 891 892 flags = 0; 893 if (mntflags & MNT_FORCE) 894 flags |= FORCECLOSE; 895 #ifdef QUOTA 896 #endif 897 if ((error = vflush(mp, NULLVP, flags)) != 0) 898 return (error); 899 pmp = VFSTOMSDOSFS(mp); 900 if (pmp->pm_devvp->v_type != VBAD) 901 pmp->pm_devvp->v_specmountpoint = NULL; 902 #ifdef MSDOSFS_DEBUG 903 { 904 struct vnode *vp = pmp->pm_devvp; 905 906 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 907 printf("flag %08x, usecount %d, writecount %d, holdcnt %d\n", 908 vp->v_vflag | vp->v_iflag | vp->v_uflag, vp->v_usecount, 909 vp->v_writecount, vp->v_holdcnt); 910 printf("mount %p, op %p\n", 911 vp->v_mount, vp->v_op); 912 printf("freef %p, freeb %p, mount %p\n", 913 vp->v_freelist.tqe_next, vp->v_freelist.tqe_prev, 914 vp->v_mount); 915 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %d, type %d\n", 916 vp->v_cleanblkhd.lh_first, 917 vp->v_dirtyblkhd.lh_first, 918 vp->v_numoutput, vp->v_type); 919 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 920 vp->v_socket, vp->v_tag, 921 ((u_int *)vp->v_data)[0], 922 ((u_int *)vp->v_data)[1]); 923 } 924 #endif 925 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY); 926 error = VOP_CLOSE(pmp->pm_devvp, 927 pmp->pm_flags & MSDOSFSMNT_RONLY ? FREAD : FREAD|FWRITE, NOCRED); 928 vput(pmp->pm_devvp); 929 free(pmp->pm_inusemap, M_MSDOSFSFAT); 930 free(pmp, M_MSDOSFSMNT); 931 mp->mnt_data = NULL; 932 mp->mnt_flag &= ~MNT_LOCAL; 933 return (error); 934 } 935 936 int 937 msdosfs_root(mp, vpp) 938 struct mount *mp; 939 struct vnode **vpp; 940 { 941 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 942 struct denode *ndep; 943 int error; 944 945 #ifdef MSDOSFS_DEBUG 946 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 947 #endif 948 if ((error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep)) != 0) 949 return (error); 950 *vpp = DETOV(ndep); 951 return (0); 952 } 953 954 int 955 msdosfs_statvfs(struct mount *mp, struct statvfs *sbp) 956 { 957 struct msdosfsmount *pmp; 958 959 pmp = VFSTOMSDOSFS(mp); 960 sbp->f_bsize = pmp->pm_bpcluster; 961 sbp->f_frsize = sbp->f_bsize; 962 sbp->f_iosize = pmp->pm_bpcluster; 963 sbp->f_blocks = pmp->pm_nmbrofclusters; 964 sbp->f_bfree = pmp->pm_freeclustercount; 965 sbp->f_bavail = pmp->pm_freeclustercount; 966 sbp->f_bresvd = 0; 967 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 968 sbp->f_ffree = 0; /* what to put in here? */ 969 sbp->f_favail = 0; /* what to put in here? */ 970 sbp->f_fresvd = 0; 971 copy_statvfs_info(sbp, mp); 972 return (0); 973 } 974 975 int 976 msdosfs_sync(mp, waitfor, cred) 977 struct mount *mp; 978 int waitfor; 979 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 if ((mvp = vnalloc(mp)) == NULL) 999 return ENOMEM; 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->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 | LK_INTERLOCK); 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 #ifdef QUOTA 1045 /* qsync(mp); */ 1046 #endif 1047 return (allerror); 1048 } 1049 1050 int 1051 msdosfs_fhtovp(mp, fhp, vpp) 1052 struct mount *mp; 1053 struct fid *fhp; 1054 struct vnode **vpp; 1055 { 1056 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 1057 struct defid defh; 1058 struct denode *dep; 1059 int error; 1060 1061 if (fhp->fid_len != sizeof(struct defid)) { 1062 DPRINTF(("fid_len %d %zd\n", fhp->fid_len, 1063 sizeof(struct defid))); 1064 return EINVAL; 1065 } 1066 1067 memcpy(&defh, fhp, sizeof(defh)); 1068 error = deget(pmp, defh.defid_dirclust, defh.defid_dirofs, &dep); 1069 if (error) { 1070 DPRINTF(("deget %d\n", error)); 1071 *vpp = NULLVP; 1072 return (error); 1073 } 1074 *vpp = DETOV(dep); 1075 return (0); 1076 } 1077 1078 int 1079 msdosfs_vptofh(vp, fhp, fh_size) 1080 struct vnode *vp; 1081 struct fid *fhp; 1082 size_t *fh_size; 1083 { 1084 struct denode *dep; 1085 struct defid defh; 1086 1087 if (*fh_size < sizeof(struct defid)) { 1088 *fh_size = sizeof(struct defid); 1089 return E2BIG; 1090 } 1091 *fh_size = sizeof(struct defid); 1092 dep = VTODE(vp); 1093 memset(&defh, 0, sizeof(defh)); 1094 defh.defid_len = sizeof(struct defid); 1095 defh.defid_dirclust = dep->de_dirclust; 1096 defh.defid_dirofs = dep->de_diroffset; 1097 /* defh.defid_gen = dep->de_gen; */ 1098 memcpy(fhp, &defh, sizeof(defh)); 1099 return (0); 1100 } 1101 1102 int 1103 msdosfs_vget(struct mount *mp, ino_t ino, 1104 struct vnode **vpp) 1105 { 1106 1107 return (EOPNOTSUPP); 1108 } 1109
Indexes created Thu Oct 16 14:10:15 GMT 2025