1 /* $NetBSD: msdosfs_vfsops.c,v 1.40 2006/11/25 12:17:30 scw Exp $ */ 2 3 /*- 4 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. 5 * Copyright (C) 1994, 1995, 1997 TooLs GmbH. 6 * All rights reserved. 7 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by TooLs GmbH. 20 * 4. The name of TooLs GmbH may not be used to endorse or promote products 21 * derived from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 26 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 27 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 28 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 29 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 30 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 31 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 32 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 /* 35 * Written by Paul Popelka (paulp@uts.amdahl.com) 36 * 37 * You can do anything you want with this software, just don't say you wrote 38 * it, and don't remove this notice. 39 * 40 * This software is provided "as is". 41 * 42 * The author supplies this software to be publicly redistributed on the 43 * understanding that the author is not responsible for the correct 44 * functioning of this software in any circumstances and is not liable for 45 * any damages caused by this software. 46 * 47 * October 1992 48 */ 49 50 #include <sys/cdefs.h> 51 __KERNEL_RCSID(0, "$NetBSD: msdosfs_vfsops.c,v 1.40 2006/11/25 12:17:30 scw 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/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/ioctl.h> 72 #include <sys/malloc.h> 73 #include <sys/dirent.h> 74 #include <sys/stat.h> 75 #include <sys/conf.h> 76 #include <sys/kauth.h> 77 78 #include <fs/msdosfs/bpb.h> 79 #include <fs/msdosfs/bootsect.h> 80 #include <fs/msdosfs/direntry.h> 81 #include <fs/msdosfs/denode.h> 82 #include <fs/msdosfs/msdosfsmount.h> 83 #include <fs/msdosfs/fat.h> 84 85 #define MSDOSFS_NAMEMAX(pmp) \ 86 (pmp)->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12 87 88 int msdosfs_mountroot(void); 89 int msdosfs_mount(struct mount *, const char *, void *, 90 struct nameidata *, struct lwp *); 91 int msdosfs_start(struct mount *, int, struct lwp *); 92 int msdosfs_unmount(struct mount *, int, struct lwp *); 93 int msdosfs_root(struct mount *, struct vnode **); 94 int msdosfs_quotactl(struct mount *, int, uid_t, void *, struct lwp *); 95 int msdosfs_statvfs(struct mount *, struct statvfs *, struct lwp *); 96 int msdosfs_sync(struct mount *, int, kauth_cred_t, struct lwp *); 97 int msdosfs_vget(struct mount *, ino_t, struct vnode **); 98 int msdosfs_fhtovp(struct mount *, struct fid *, struct vnode **); 99 int msdosfs_vptofh(struct vnode *, struct fid *, size_t *fh_size); 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_DEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOS FS mount structure"); 107 MALLOC_DEFINE(M_MSDOSFSFAT, "MSDOSFS fat", "MSDOS FS fat table"); 108 109 #define ROOTNAME "root_device" 110 111 extern const struct vnodeopv_desc msdosfs_vnodeop_opv_desc; 112 113 const struct vnodeopv_desc * const msdosfs_vnodeopv_descs[] = { 114 &msdosfs_vnodeop_opv_desc, 115 NULL, 116 }; 117 118 struct vfsops msdosfs_vfsops = { 119 MOUNT_MSDOS, 120 msdosfs_mount, 121 msdosfs_start, 122 msdosfs_unmount, 123 msdosfs_root, 124 msdosfs_quotactl, 125 msdosfs_statvfs, 126 msdosfs_sync, 127 msdosfs_vget, 128 msdosfs_fhtovp, 129 msdosfs_vptofh, 130 msdosfs_init, 131 msdosfs_reinit, 132 msdosfs_done, 133 msdosfs_mountroot, 134 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 135 vfs_stdextattrctl, 136 msdosfs_vnodeopv_descs, 137 0, 138 { NULL, NULL }, 139 }; 140 VFS_ATTACH(msdosfs_vfsops); 141 142 static int 143 update_mp(mp, argp) 144 struct mount *mp; 145 struct msdosfs_args *argp; 146 { 147 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 148 int error; 149 150 pmp->pm_gid = argp->gid; 151 pmp->pm_uid = argp->uid; 152 pmp->pm_mask = argp->mask & ALLPERMS; 153 pmp->pm_dirmask = argp->dirmask & ALLPERMS; 154 pmp->pm_gmtoff = argp->gmtoff; 155 pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT; 156 157 /* 158 * GEMDOS knows nothing (yet) about win95 159 */ 160 if (pmp->pm_flags & MSDOSFSMNT_GEMDOSFS) 161 pmp->pm_flags |= MSDOSFSMNT_NOWIN95; 162 163 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 164 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 165 else if (!(pmp->pm_flags & 166 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 167 struct vnode *rtvp; 168 169 /* 170 * Try to divine whether to support Win'95 long filenames 171 */ 172 if (FAT32(pmp)) 173 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 174 else { 175 if ((error = msdosfs_root(mp, &rtvp)) != 0) 176 return error; 177 pmp->pm_flags |= findwin95(VTODE(rtvp)) 178 ? MSDOSFSMNT_LONGNAME 179 : MSDOSFSMNT_SHORTNAME; 180 vput(rtvp); 181 } 182 } 183 184 mp->mnt_stat.f_namemax = MSDOSFS_NAMEMAX(pmp); 185 186 return 0; 187 } 188 189 int 190 msdosfs_mountroot() 191 { 192 struct mount *mp; 193 struct lwp *l = curlwp; /* XXX */ 194 int error; 195 struct msdosfs_args args; 196 197 if (device_class(root_device) != DV_DISK) 198 return (ENODEV); 199 200 if ((error = vfs_rootmountalloc(MOUNT_MSDOS, "root_device", &mp))) { 201 vrele(rootvp); 202 return (error); 203 } 204 205 args.flags = MSDOSFSMNT_VERSIONED; 206 args.uid = 0; 207 args.gid = 0; 208 args.mask = 0777; 209 args.version = MSDOSFSMNT_VERSION; 210 args.dirmask = 0777; 211 212 if ((error = msdosfs_mountfs(rootvp, mp, l, &args)) != 0) { 213 mp->mnt_op->vfs_refcount--; 214 vfs_unbusy(mp); 215 free(mp, M_MOUNT); 216 return (error); 217 } 218 219 if ((error = update_mp(mp, &args)) != 0) { 220 (void)msdosfs_unmount(mp, 0, l); 221 vfs_unbusy(mp); 222 free(mp, M_MOUNT); 223 vrele(rootvp); 224 return (error); 225 } 226 227 simple_lock(&mountlist_slock); 228 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 229 simple_unlock(&mountlist_slock); 230 (void)msdosfs_statvfs(mp, &mp->mnt_stat, l); 231 vfs_unbusy(mp); 232 return (0); 233 } 234 235 /* 236 * mp - path - addr in user space of mount point (ie /usr or whatever) 237 * data - addr in user space of mount params including the name of the block 238 * special file to treat as a filesystem. 239 */ 240 int 241 msdosfs_mount(mp, path, data, ndp, l) 242 struct mount *mp; 243 const char *path; 244 void *data; 245 struct nameidata *ndp; 246 struct lwp *l; 247 { 248 struct vnode *devvp; /* vnode for blk device to mount */ 249 struct msdosfs_args args; /* will hold data from mount request */ 250 /* msdosfs specific mount control block */ 251 struct msdosfsmount *pmp = NULL; 252 int error, flags; 253 mode_t accessmode; 254 255 if (mp->mnt_flag & MNT_GETARGS) { 256 pmp = VFSTOMSDOSFS(mp); 257 if (pmp == NULL) 258 return EIO; 259 args.fspec = NULL; 260 args.uid = pmp->pm_uid; 261 args.gid = pmp->pm_gid; 262 args.mask = pmp->pm_mask; 263 args.flags = pmp->pm_flags; 264 args.version = MSDOSFSMNT_VERSION; 265 args.dirmask = pmp->pm_dirmask; 266 args.gmtoff = pmp->pm_gmtoff; 267 return copyout(&args, data, sizeof(args)); 268 } 269 error = copyin(data, &args, sizeof(struct msdosfs_args)); 270 if (error) 271 return (error); 272 273 /* 274 * If not versioned (i.e. using old mount_msdos(8)), fill in 275 * the additional structure items with suitable defaults. 276 */ 277 if ((args.flags & MSDOSFSMNT_VERSIONED) == 0) { 278 args.version = 1; 279 args.dirmask = args.mask; 280 } 281 282 /* 283 * Reset GMT offset for pre-v3 mount structure args. 284 */ 285 if (args.version < 3) 286 args.gmtoff = 0; 287 288 /* 289 * If updating, check whether changing from read-only to 290 * read/write; if there is no device name, that's all we do. 291 */ 292 if (mp->mnt_flag & MNT_UPDATE) { 293 pmp = VFSTOMSDOSFS(mp); 294 error = 0; 295 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_RDONLY)) { 296 flags = WRITECLOSE; 297 if (mp->mnt_flag & MNT_FORCE) 298 flags |= FORCECLOSE; 299 error = vflush(mp, NULLVP, flags); 300 } 301 if (!error && (mp->mnt_flag & MNT_RELOAD)) 302 /* not yet implemented */ 303 error = EOPNOTSUPP; 304 if (error) 305 return (error); 306 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_iflag & IMNT_WANTRDWR)) { 307 /* 308 * If upgrade to read-write by non-root, then verify 309 * that user has necessary permissions on the device. 310 */ 311 if (kauth_authorize_generic(l->l_cred, 312 KAUTH_GENERIC_ISSUSER, NULL) != 0) { 313 devvp = pmp->pm_devvp; 314 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 315 error = VOP_ACCESS(devvp, VREAD | VWRITE, 316 l->l_cred, l); 317 VOP_UNLOCK(devvp, 0); 318 if (error) 319 return (error); 320 } 321 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 322 } 323 if (args.fspec == NULL) 324 return EINVAL; 325 } 326 /* 327 * Not an update, or updating the name: look up the name 328 * and verify that it refers to a sensible block device. 329 */ 330 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, l); 331 if ((error = namei(ndp)) != 0) 332 return (error); 333 devvp = ndp->ni_vp; 334 335 if (devvp->v_type != VBLK) { 336 vrele(devvp); 337 return (ENOTBLK); 338 } 339 if (bdevsw_lookup(devvp->v_rdev) == NULL) { 340 vrele(devvp); 341 return (ENXIO); 342 } 343 /* 344 * If mount by non-root, then verify that user has necessary 345 * permissions on the device. 346 */ 347 if (kauth_authorize_generic(l->l_cred, KAUTH_GENERIC_ISSUSER, NULL) != 0) { 348 accessmode = VREAD; 349 if ((mp->mnt_flag & MNT_RDONLY) == 0) 350 accessmode |= VWRITE; 351 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 352 error = VOP_ACCESS(devvp, accessmode, l->l_cred, l); 353 VOP_UNLOCK(devvp, 0); 354 if (error) { 355 vrele(devvp); 356 return (error); 357 } 358 } 359 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 360 int xflags; 361 362 /* 363 * Disallow multiple mounts of the same device. 364 * Disallow mounting of a device that is currently in use 365 * (except for root, which might share swap device for 366 * miniroot). 367 */ 368 error = vfs_mountedon(devvp); 369 if (error) 370 goto fail; 371 if (vcount(devvp) > 1 && devvp != rootvp) { 372 error = EBUSY; 373 goto fail; 374 } 375 if (mp->mnt_flag & MNT_RDONLY) 376 xflags = FREAD; 377 else 378 xflags = FREAD|FWRITE; 379 error = VOP_OPEN(devvp, xflags, FSCRED, l); 380 if (error) 381 goto fail; 382 error = msdosfs_mountfs(devvp, mp, l, &args); 383 if (error) { 384 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 385 (void) VOP_CLOSE(devvp, xflags, NOCRED, l); 386 VOP_UNLOCK(devvp, 0); 387 goto fail; 388 } 389 #ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 390 pmp = VFSTOMSDOSFS(mp); 391 #endif 392 } else { 393 vrele(devvp); 394 if (devvp != pmp->pm_devvp) 395 return (EINVAL); /* needs translation */ 396 } 397 if ((error = update_mp(mp, &args)) != 0) { 398 msdosfs_unmount(mp, MNT_FORCE, l); 399 return error; 400 } 401 402 #ifdef MSDOSFS_DEBUG 403 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 404 #endif 405 return set_statvfs_info(path, UIO_USERSPACE, args.fspec, UIO_USERSPACE, 406 mp, l); 407 408 fail: 409 vrele(devvp); 410 return (error); 411 } 412 413 int 414 msdosfs_mountfs(devvp, mp, l, argp) 415 struct vnode *devvp; 416 struct mount *mp; 417 struct lwp *l; 418 struct msdosfs_args *argp; 419 { 420 struct msdosfsmount *pmp; 421 struct buf *bp; 422 dev_t dev = devvp->v_rdev; 423 struct partinfo dpart; 424 union bootsector *bsp; 425 struct byte_bpb33 *b33; 426 struct byte_bpb50 *b50; 427 struct byte_bpb710 *b710; 428 u_int8_t SecPerClust; 429 int ronly, error; 430 int bsize = 0, dtype = 0, tmp; 431 432 /* Flush out any old buffers remaining from a previous use. */ 433 if ((error = vinvalbuf(devvp, V_SAVE, l->l_cred, l, 0, 0)) != 0) 434 return (error); 435 436 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 437 438 bp = NULL; /* both used in error_exit */ 439 pmp = NULL; 440 441 /* 442 * We need the disklabel to calculate the size of a FAT entry 443 * later on. Also make sure the partition contains a filesystem 444 * of type FS_MSDOS. This doesn't work for floppies, so we have 445 * to check for them too. 446 * 447 * There might still be parts of the msdos fs driver which assume 448 * that the size of a disk block will always be 512 bytes. 449 * Let's root them out... 450 */ 451 error = VOP_IOCTL(devvp, DIOCGPART, &dpart, FREAD, NOCRED, l); 452 if (error) 453 goto error_exit; 454 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 455 tmp = dpart.part->p_fstype; 456 dtype = dpart.disklab->d_type; 457 bsize = dpart.disklab->d_secsize; 458 if (bsize != 512 || (dtype!=DTYPE_FLOPPY && tmp!=FS_MSDOS)) { 459 error = EINVAL; 460 goto error_exit; 461 } 462 } 463 464 /* 465 * Read the boot sector of the filesystem, and then check the 466 * boot signature. If not a dos boot sector then error out. 467 */ 468 if ((error = bread(devvp, 0, dpart.disklab->d_secsize, NOCRED, 469 &bp)) != 0) 470 goto error_exit; 471 bp->b_flags |= B_AGE; 472 bsp = (union bootsector *)bp->b_data; 473 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 474 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 475 b710 = (struct byte_bpb710 *)bsp->bs710.bsBPB; 476 477 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 478 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 479 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 480 error = EINVAL; 481 goto error_exit; 482 } 483 } 484 485 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK); 486 memset(pmp, 0, sizeof *pmp); 487 pmp->pm_mountp = mp; 488 489 /* 490 * Compute several useful quantities from the bpb in the 491 * bootsector. Copy in the dos 5 variant of the bpb then fix up 492 * the fields that are different between dos 5 and dos 3.3. 493 */ 494 SecPerClust = b50->bpbSecPerClust; 495 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 496 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 497 pmp->pm_FATs = b50->bpbFATs; 498 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 499 pmp->pm_Sectors = getushort(b50->bpbSectors); 500 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 501 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 502 pmp->pm_Heads = getushort(b50->bpbHeads); 503 pmp->pm_Media = b50->bpbMedia; 504 505 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 506 /* XXX - We should probably check more values here */ 507 if (!pmp->pm_BytesPerSec || !SecPerClust 508 || pmp->pm_Heads > 255 || pmp->pm_SecPerTrack > 63) { 509 error = EINVAL; 510 goto error_exit; 511 } 512 } 513 514 if (pmp->pm_Sectors == 0) { 515 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 516 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 517 } else { 518 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 519 pmp->pm_HugeSectors = pmp->pm_Sectors; 520 } 521 522 if (pmp->pm_RootDirEnts == 0) { 523 /* 524 * Some say that bsBootSectSig[23] must be zero, but 525 * Windows does not require this and some digital cameras 526 * do not set these to zero. Therefore, do not insist. 527 */ 528 if (pmp->pm_Sectors 529 || pmp->pm_FATsecs 530 || getushort(b710->bpbFSVers)) { 531 error = EINVAL; 532 goto error_exit; 533 } 534 pmp->pm_fatmask = FAT32_MASK; 535 pmp->pm_fatmult = 4; 536 pmp->pm_fatdiv = 1; 537 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 538 539 /* mirrorring is enabled if the FATMIRROR bit is not set */ 540 if ((getushort(b710->bpbExtFlags) & FATMIRROR) == 0) 541 pmp->pm_flags |= MSDOSFS_FATMIRROR; 542 else 543 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 544 } else 545 pmp->pm_flags |= MSDOSFS_FATMIRROR; 546 547 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 548 if (FAT32(pmp)) { 549 /* 550 * GEMDOS doesn't know fat32. 551 */ 552 error = EINVAL; 553 goto error_exit; 554 } 555 556 /* 557 * Check a few values (could do some more): 558 * - logical sector size: power of 2, >= block size 559 * - sectors per cluster: power of 2, >= 1 560 * - number of sectors: >= 1, <= size of partition 561 */ 562 if ( (SecPerClust == 0) 563 || (SecPerClust & (SecPerClust - 1)) 564 || (pmp->pm_BytesPerSec < bsize) 565 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 566 || (pmp->pm_HugeSectors == 0) 567 || (pmp->pm_HugeSectors * (pmp->pm_BytesPerSec / bsize) 568 > dpart.part->p_size) 569 ) { 570 error = EINVAL; 571 goto error_exit; 572 } 573 /* 574 * XXX - Many parts of the msdos fs driver seem to assume that 575 * the number of bytes per logical sector (BytesPerSec) will 576 * always be the same as the number of bytes per disk block 577 * Let's pretend it is. 578 */ 579 tmp = pmp->pm_BytesPerSec / bsize; 580 pmp->pm_BytesPerSec = bsize; 581 pmp->pm_HugeSectors *= tmp; 582 pmp->pm_HiddenSects *= tmp; 583 pmp->pm_ResSectors *= tmp; 584 pmp->pm_Sectors *= tmp; 585 pmp->pm_FATsecs *= tmp; 586 SecPerClust *= tmp; 587 } 588 pmp->pm_fatblk = pmp->pm_ResSectors; 589 if (FAT32(pmp)) { 590 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 591 pmp->pm_firstcluster = pmp->pm_fatblk 592 + (pmp->pm_FATs * pmp->pm_FATsecs); 593 pmp->pm_fsinfo = getushort(b710->bpbFSInfo); 594 } else { 595 pmp->pm_rootdirblk = pmp->pm_fatblk + 596 (pmp->pm_FATs * pmp->pm_FATsecs); 597 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 598 + pmp->pm_BytesPerSec - 1) 599 / pmp->pm_BytesPerSec;/* in sectors */ 600 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 601 } 602 603 pmp->pm_nmbrofclusters = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 604 SecPerClust; 605 pmp->pm_maxcluster = pmp->pm_nmbrofclusters + 1; 606 pmp->pm_fatsize = pmp->pm_FATsecs * pmp->pm_BytesPerSec; 607 608 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 609 if (pmp->pm_nmbrofclusters <= (0xff0 - 2) 610 && (dtype == DTYPE_FLOPPY 611 || (dtype == DTYPE_VND 612 && (pmp->pm_Heads == 1 || pmp->pm_Heads == 2))) 613 ) { 614 pmp->pm_fatmask = FAT12_MASK; 615 pmp->pm_fatmult = 3; 616 pmp->pm_fatdiv = 2; 617 } else { 618 pmp->pm_fatmask = FAT16_MASK; 619 pmp->pm_fatmult = 2; 620 pmp->pm_fatdiv = 1; 621 } 622 } else if (pmp->pm_fatmask == 0) { 623 if (pmp->pm_maxcluster 624 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 625 /* 626 * This will usually be a floppy disk. This size makes 627 * sure that one fat entry will not be split across 628 * multiple blocks. 629 */ 630 pmp->pm_fatmask = FAT12_MASK; 631 pmp->pm_fatmult = 3; 632 pmp->pm_fatdiv = 2; 633 } else { 634 pmp->pm_fatmask = FAT16_MASK; 635 pmp->pm_fatmult = 2; 636 pmp->pm_fatdiv = 1; 637 } 638 } 639 if (FAT12(pmp)) 640 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 641 else 642 pmp->pm_fatblocksize = MAXBSIZE; 643 644 pmp->pm_fatblocksec = pmp->pm_fatblocksize / pmp->pm_BytesPerSec; 645 pmp->pm_bnshift = ffs(pmp->pm_BytesPerSec) - 1; 646 647 /* 648 * Compute mask and shift value for isolating cluster relative byte 649 * offsets and cluster numbers from a file offset. 650 */ 651 pmp->pm_bpcluster = SecPerClust * pmp->pm_BytesPerSec; 652 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 653 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 654 655 /* 656 * Check for valid cluster size 657 * must be a power of 2 658 */ 659 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 660 error = EINVAL; 661 goto error_exit; 662 } 663 664 /* 665 * Release the bootsector buffer. 666 */ 667 brelse(bp); 668 bp = NULL; 669 670 /* 671 * Check FSInfo. 672 */ 673 if (pmp->pm_fsinfo) { 674 struct fsinfo *fp; 675 676 /* 677 * XXX If the fsinfo block is stored on media with 678 * 2KB or larger sectors, is the fsinfo structure 679 * padded at the end or in the middle? 680 */ 681 if ((error = bread(devvp, de_bn2kb(pmp, pmp->pm_fsinfo), 682 pmp->pm_BytesPerSec, NOCRED, &bp)) != 0) 683 goto error_exit; 684 fp = (struct fsinfo *)bp->b_data; 685 if (!memcmp(fp->fsisig1, "RRaA", 4) 686 && !memcmp(fp->fsisig2, "rrAa", 4) 687 && !memcmp(fp->fsisig3, "\0\0\125\252", 4) 688 && !memcmp(fp->fsisig4, "\0\0\125\252", 4)) 689 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 690 else 691 pmp->pm_fsinfo = 0; 692 brelse(bp); 693 bp = NULL; 694 } 695 696 /* 697 * Check and validate (or perhaps invalidate?) the fsinfo structure? 698 * XXX 699 */ 700 if (pmp->pm_fsinfo) { 701 if (pmp->pm_nxtfree == (u_long)-1) 702 pmp->pm_fsinfo = 0; 703 } 704 705 /* 706 * Allocate memory for the bitmap of allocated clusters, and then 707 * fill it in. 708 */ 709 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 710 / N_INUSEBITS) 711 * sizeof(*pmp->pm_inusemap), 712 M_MSDOSFSFAT, M_WAITOK); 713 714 /* 715 * fillinusemap() needs pm_devvp. 716 */ 717 pmp->pm_dev = dev; 718 pmp->pm_devvp = devvp; 719 720 /* 721 * Have the inuse map filled in. 722 */ 723 if ((error = fillinusemap(pmp)) != 0) 724 goto error_exit; 725 726 /* 727 * If they want fat updates to be synchronous then let them suffer 728 * the performance degradation in exchange for the on disk copy of 729 * the fat being correct just about all the time. I suppose this 730 * would be a good thing to turn on if the kernel is still flakey. 731 */ 732 if (mp->mnt_flag & MNT_SYNCHRONOUS) 733 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 734 735 /* 736 * Finish up. 737 */ 738 if (ronly) 739 pmp->pm_flags |= MSDOSFSMNT_RONLY; 740 else 741 pmp->pm_fmod = 1; 742 mp->mnt_data = pmp; 743 mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev; 744 mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_MSDOS); 745 mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; 746 mp->mnt_stat.f_namemax = MSDOSFS_NAMEMAX(pmp); 747 mp->mnt_flag |= MNT_LOCAL; 748 mp->mnt_dev_bshift = pmp->pm_bnshift; 749 mp->mnt_fs_bshift = pmp->pm_cnshift; 750 751 #ifdef QUOTA 752 /* 753 * If we ever do quotas for DOS filesystems this would be a place 754 * to fill in the info in the msdosfsmount structure. You dolt, 755 * quotas on dos filesystems make no sense because files have no 756 * owners on dos filesystems. of course there is some empty space 757 * in the directory entry where we could put uid's and gid's. 758 */ 759 #endif 760 devvp->v_specmountpoint = mp; 761 762 return (0); 763 764 error_exit:; 765 if (bp) 766 brelse(bp); 767 if (pmp) { 768 if (pmp->pm_inusemap) 769 free(pmp->pm_inusemap, M_MSDOSFSFAT); 770 free(pmp, M_MSDOSFSMNT); 771 mp->mnt_data = NULL; 772 } 773 return (error); 774 } 775 776 int 777 msdosfs_start(struct mount *mp, int flags, 778 struct lwp *l) 779 { 780 781 return (0); 782 } 783 784 /* 785 * Unmount the filesystem described by mp. 786 */ 787 int 788 msdosfs_unmount(mp, mntflags, l) 789 struct mount *mp; 790 int mntflags; 791 struct lwp *l; 792 { 793 struct msdosfsmount *pmp; 794 int error, flags; 795 796 flags = 0; 797 if (mntflags & MNT_FORCE) 798 flags |= FORCECLOSE; 799 #ifdef QUOTA 800 #endif 801 if ((error = vflush(mp, NULLVP, flags)) != 0) 802 return (error); 803 pmp = VFSTOMSDOSFS(mp); 804 if (pmp->pm_devvp->v_type != VBAD) 805 pmp->pm_devvp->v_specmountpoint = NULL; 806 #ifdef MSDOSFS_DEBUG 807 { 808 struct vnode *vp = pmp->pm_devvp; 809 810 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 811 printf("flag %08x, usecount %d, writecount %ld, holdcnt %ld\n", 812 vp->v_flag, vp->v_usecount, vp->v_writecount, vp->v_holdcnt); 813 printf("mount %p, op %p\n", 814 vp->v_mount, vp->v_op); 815 printf("freef %p, freeb %p, mount %p\n", 816 vp->v_freelist.tqe_next, vp->v_freelist.tqe_prev, 817 vp->v_mount); 818 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %d, type %d\n", 819 vp->v_cleanblkhd.lh_first, 820 vp->v_dirtyblkhd.lh_first, 821 vp->v_numoutput, vp->v_type); 822 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 823 vp->v_socket, vp->v_tag, 824 ((u_int *)vp->v_data)[0], 825 ((u_int *)vp->v_data)[1]); 826 } 827 #endif 828 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY); 829 error = VOP_CLOSE(pmp->pm_devvp, 830 pmp->pm_flags & MSDOSFSMNT_RONLY ? FREAD : FREAD|FWRITE, NOCRED, l); 831 vput(pmp->pm_devvp); 832 free(pmp->pm_inusemap, M_MSDOSFSFAT); 833 free(pmp, M_MSDOSFSMNT); 834 mp->mnt_data = NULL; 835 mp->mnt_flag &= ~MNT_LOCAL; 836 return (error); 837 } 838 839 int 840 msdosfs_root(mp, vpp) 841 struct mount *mp; 842 struct vnode **vpp; 843 { 844 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 845 struct denode *ndep; 846 int error; 847 848 #ifdef MSDOSFS_DEBUG 849 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 850 #endif 851 if ((error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep)) != 0) 852 return (error); 853 *vpp = DETOV(ndep); 854 return (0); 855 } 856 857 int 858 msdosfs_quotactl(struct mount *mp, int cmds, 859 uid_t uid, void *arg, struct lwp *l) 860 { 861 862 return (EOPNOTSUPP); 863 } 864 865 int 866 msdosfs_statvfs(struct mount *mp, struct statvfs *sbp, struct lwp *l) 867 { 868 struct msdosfsmount *pmp; 869 870 pmp = VFSTOMSDOSFS(mp); 871 sbp->f_bsize = pmp->pm_bpcluster; 872 sbp->f_frsize = sbp->f_bsize; 873 sbp->f_iosize = pmp->pm_bpcluster; 874 sbp->f_blocks = pmp->pm_nmbrofclusters; 875 sbp->f_bfree = pmp->pm_freeclustercount; 876 sbp->f_bavail = pmp->pm_freeclustercount; 877 sbp->f_bresvd = 0; 878 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 879 sbp->f_ffree = 0; /* what to put in here? */ 880 sbp->f_favail = 0; /* what to put in here? */ 881 sbp->f_fresvd = 0; 882 copy_statvfs_info(sbp, mp); 883 return (0); 884 } 885 886 int 887 msdosfs_sync(mp, waitfor, cred, l) 888 struct mount *mp; 889 int waitfor; 890 kauth_cred_t cred; 891 struct lwp *l; 892 { 893 struct vnode *vp, *nvp; 894 struct denode *dep; 895 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 896 int error, allerror = 0; 897 898 /* 899 * If we ever switch to not updating all of the fats all the time, 900 * this would be the place to update them from the first one. 901 */ 902 if (pmp->pm_fmod != 0) { 903 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 904 panic("msdosfs_sync: rofs mod"); 905 else { 906 /* update fats here */ 907 } 908 } 909 /* 910 * Write back each (modified) denode. 911 */ 912 simple_lock(&mntvnode_slock); 913 loop: 914 for (vp = TAILQ_FIRST(&mp->mnt_vnodelist); vp; vp = nvp) { 915 /* 916 * If the vnode that we are about to sync is no longer 917 * assoicated with this mount point, start over. 918 */ 919 if (vp->v_mount != mp) 920 goto loop; 921 simple_lock(&vp->v_interlock); 922 nvp = TAILQ_NEXT(vp, v_mntvnodes); 923 dep = VTODE(vp); 924 if (waitfor == MNT_LAZY || vp->v_type == VNON || 925 (((dep->de_flag & 926 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0) && 927 (LIST_EMPTY(&vp->v_dirtyblkhd) && 928 vp->v_uobj.uo_npages == 0))) { 929 simple_unlock(&vp->v_interlock); 930 continue; 931 } 932 simple_unlock(&mntvnode_slock); 933 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK); 934 if (error) { 935 simple_lock(&mntvnode_slock); 936 if (error == ENOENT) 937 goto loop; 938 continue; 939 } 940 if ((error = VOP_FSYNC(vp, cred, 941 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0, l)) != 0) 942 allerror = error; 943 vput(vp); 944 simple_lock(&mntvnode_slock); 945 } 946 simple_unlock(&mntvnode_slock); 947 /* 948 * Force stale file system control information to be flushed. 949 */ 950 if ((error = VOP_FSYNC(pmp->pm_devvp, cred, 951 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0, l)) != 0) 952 allerror = error; 953 #ifdef QUOTA 954 /* qsync(mp); */ 955 #endif 956 return (allerror); 957 } 958 959 int 960 msdosfs_fhtovp(mp, fhp, vpp) 961 struct mount *mp; 962 struct fid *fhp; 963 struct vnode **vpp; 964 { 965 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 966 struct defid defh; 967 struct denode *dep; 968 int error; 969 970 if (fhp->fid_len != sizeof(struct defid)) 971 return EINVAL; 972 973 memcpy(&defh, fhp, sizeof(defh)); 974 error = deget(pmp, defh.defid_dirclust, defh.defid_dirofs, &dep); 975 if (error) { 976 *vpp = NULLVP; 977 return (error); 978 } 979 *vpp = DETOV(dep); 980 return (0); 981 } 982 983 int 984 msdosfs_vptofh(vp, fhp, fh_size) 985 struct vnode *vp; 986 struct fid *fhp; 987 size_t *fh_size; 988 { 989 struct denode *dep; 990 struct defid defh; 991 992 if (*fh_size < sizeof(struct defid)) { 993 *fh_size = sizeof(struct defid); 994 return E2BIG; 995 } 996 *fh_size = sizeof(struct defid); 997 dep = VTODE(vp); 998 memset(&defh, 0, sizeof(defh)); 999 defh.defid_len = sizeof(struct defid); 1000 defh.defid_dirclust = dep->de_dirclust; 1001 defh.defid_dirofs = dep->de_diroffset; 1002 /* defh.defid_gen = dep->de_gen; */ 1003 memcpy(fhp, &defh, sizeof(defh)); 1004 return (0); 1005 } 1006 1007 int 1008 msdosfs_vget(struct mount *mp, ino_t ino, 1009 struct vnode **vpp) 1010 { 1011 1012 return (EOPNOTSUPP); 1013 } 1014 1015 SYSCTL_SETUP(sysctl_vfs_msdosfs_setup, "sysctl vfs.msdosfs subtree setup") 1016 { 1017 1018 sysctl_createv(clog, 0, NULL, NULL, 1019 CTLFLAG_PERMANENT, 1020 CTLTYPE_NODE, "vfs", NULL, 1021 NULL, 0, NULL, 0, 1022 CTL_VFS, CTL_EOL); 1023 sysctl_createv(clog, 0, NULL, NULL, 1024 CTLFLAG_PERMANENT, 1025 CTLTYPE_NODE, "msdosfs", 1026 SYSCTL_DESCR("MS-DOS file system"), 1027 NULL, 0, NULL, 0, 1028 CTL_VFS, 4, CTL_EOL); 1029 /* 1030 * XXX the "4" above could be dynamic, thereby eliminating one 1031 * more instance of the "number to vfs" mapping problem, but 1032 * "4" is the order as taken from sys/mount.h 1033 */ 1034 } 1035