1 /* $NetBSD: msdosfs_vfsops.c,v 1.23 2005/03/29 02:41:05 thorpej 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 1.23 2005/03/29 02:41:05 thorpej 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 77 #include <fs/msdosfs/bpb.h> 78 #include <fs/msdosfs/bootsect.h> 79 #include <fs/msdosfs/direntry.h> 80 #include <fs/msdosfs/denode.h> 81 #include <fs/msdosfs/msdosfsmount.h> 82 #include <fs/msdosfs/fat.h> 83 84 #define MSDOSFS_NAMEMAX(pmp) \ 85 (pmp)->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12 86 87 int msdosfs_mountroot __P((void)); 88 int msdosfs_mount __P((struct mount *, const char *, void *, 89 struct nameidata *, struct proc *)); 90 int msdosfs_start __P((struct mount *, int, struct proc *)); 91 int msdosfs_unmount __P((struct mount *, int, struct proc *)); 92 int msdosfs_root __P((struct mount *, struct vnode **)); 93 int msdosfs_quotactl __P((struct mount *, int, uid_t, void *, struct proc *)); 94 int msdosfs_statvfs __P((struct mount *, struct statvfs *, struct proc *)); 95 int msdosfs_sync __P((struct mount *, int, struct ucred *, struct proc *)); 96 int msdosfs_vget __P((struct mount *, ino_t, struct vnode **)); 97 int msdosfs_fhtovp __P((struct mount *, struct fid *, struct vnode **)); 98 int msdosfs_checkexp __P((struct mount *, struct mbuf *, int *, 99 struct ucred **)); 100 int msdosfs_vptofh __P((struct vnode *, struct fid *)); 101 102 int msdosfs_mountfs __P((struct vnode *, struct mount *, struct proc *, 103 struct msdosfs_args *)); 104 105 static int update_mp __P((struct mount *, struct msdosfs_args *)); 106 107 MALLOC_DEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOS FS mount structure"); 108 MALLOC_DEFINE(M_MSDOSFSFAT, "MSDOSFS fat", "MSDOS FS fat table"); 109 110 #define ROOTNAME "root_device" 111 112 extern const struct vnodeopv_desc msdosfs_vnodeop_opv_desc; 113 114 const struct vnodeopv_desc * const msdosfs_vnodeopv_descs[] = { 115 &msdosfs_vnodeop_opv_desc, 116 NULL, 117 }; 118 119 struct vfsops msdosfs_vfsops = { 120 MOUNT_MSDOS, 121 msdosfs_mount, 122 msdosfs_start, 123 msdosfs_unmount, 124 msdosfs_root, 125 msdosfs_quotactl, 126 msdosfs_statvfs, 127 msdosfs_sync, 128 msdosfs_vget, 129 msdosfs_fhtovp, 130 msdosfs_vptofh, 131 msdosfs_init, 132 msdosfs_reinit, 133 msdosfs_done, 134 NULL, 135 msdosfs_mountroot, 136 msdosfs_checkexp, 137 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 138 vfs_stdextattrctl, 139 msdosfs_vnodeopv_descs, 140 }; 141 VFS_ATTACH(msdosfs_vfsops); 142 143 static int 144 update_mp(mp, argp) 145 struct mount *mp; 146 struct msdosfs_args *argp; 147 { 148 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 149 int error; 150 151 pmp->pm_gid = argp->gid; 152 pmp->pm_uid = argp->uid; 153 pmp->pm_mask = argp->mask & ALLPERMS; 154 pmp->pm_dirmask = argp->dirmask & ALLPERMS; 155 pmp->pm_gmtoff = argp->gmtoff; 156 pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT; 157 158 /* 159 * GEMDOS knows nothing (yet) about win95 160 */ 161 if (pmp->pm_flags & MSDOSFSMNT_GEMDOSFS) 162 pmp->pm_flags |= MSDOSFSMNT_NOWIN95; 163 164 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 165 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 166 else if (!(pmp->pm_flags & 167 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 168 struct vnode *rootvp; 169 170 /* 171 * Try to divine whether to support Win'95 long filenames 172 */ 173 if (FAT32(pmp)) 174 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 175 else { 176 if ((error = msdosfs_root(mp, &rootvp)) != 0) 177 return error; 178 pmp->pm_flags |= findwin95(VTODE(rootvp)) 179 ? MSDOSFSMNT_LONGNAME 180 : MSDOSFSMNT_SHORTNAME; 181 vput(rootvp); 182 } 183 } 184 185 mp->mnt_stat.f_namemax = MSDOSFS_NAMEMAX(pmp); 186 187 return 0; 188 } 189 190 int 191 msdosfs_mountroot() 192 { 193 struct mount *mp; 194 struct proc *p = curproc; /* XXX */ 195 int error; 196 struct msdosfs_args args; 197 198 if (root_device->dv_class != DV_DISK) 199 return (ENODEV); 200 201 if ((error = vfs_rootmountalloc(MOUNT_MSDOS, "root_device", &mp))) { 202 vrele(rootvp); 203 return (error); 204 } 205 206 args.flags = MSDOSFSMNT_VERSIONED; 207 args.uid = 0; 208 args.gid = 0; 209 args.mask = 0777; 210 args.version = MSDOSFSMNT_VERSION; 211 args.dirmask = 0777; 212 213 if ((error = msdosfs_mountfs(rootvp, mp, p, &args)) != 0) { 214 mp->mnt_op->vfs_refcount--; 215 vfs_unbusy(mp); 216 free(mp, M_MOUNT); 217 return (error); 218 } 219 220 if ((error = update_mp(mp, &args)) != 0) { 221 (void)msdosfs_unmount(mp, 0, p); 222 vfs_unbusy(mp); 223 free(mp, M_MOUNT); 224 vrele(rootvp); 225 return (error); 226 } 227 228 simple_lock(&mountlist_slock); 229 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 230 simple_unlock(&mountlist_slock); 231 (void)msdosfs_statvfs(mp, &mp->mnt_stat, p); 232 vfs_unbusy(mp); 233 return (0); 234 } 235 236 /* 237 * mp - path - addr in user space of mount point (ie /usr or whatever) 238 * data - addr in user space of mount params including the name of the block 239 * special file to treat as a filesystem. 240 */ 241 int 242 msdosfs_mount(mp, path, data, ndp, p) 243 struct mount *mp; 244 const char *path; 245 void *data; 246 struct nameidata *ndp; 247 struct proc *p; 248 { 249 struct vnode *devvp; /* vnode for blk device to mount */ 250 struct msdosfs_args args; /* will hold data from mount request */ 251 /* msdosfs specific mount control block */ 252 struct msdosfsmount *pmp = NULL; 253 int error, flags; 254 mode_t accessmode; 255 256 if (mp->mnt_flag & MNT_GETARGS) { 257 pmp = VFSTOMSDOSFS(mp); 258 if (pmp == NULL) 259 return EIO; 260 args.fspec = NULL; 261 args.uid = pmp->pm_uid; 262 args.gid = pmp->pm_gid; 263 args.mask = pmp->pm_mask; 264 args.flags = pmp->pm_flags; 265 args.version = MSDOSFSMNT_VERSION; 266 args.dirmask = pmp->pm_dirmask; 267 args.gmtoff = pmp->pm_gmtoff; 268 vfs_showexport(mp, &args.export, &pmp->pm_export); 269 return copyout(&args, data, sizeof(args)); 270 } 271 error = copyin(data, &args, sizeof(struct msdosfs_args)); 272 if (error) 273 return (error); 274 275 /* 276 * If not versioned (i.e. using old mount_msdos(8)), fill in 277 * the additional structure items with suitable defaults. 278 */ 279 if ((args.flags & MSDOSFSMNT_VERSIONED) == 0) { 280 args.version = 1; 281 args.dirmask = args.mask; 282 } 283 284 /* 285 * Reset GMT offset for pre-v3 mount structure args. 286 */ 287 if (args.version < 3) 288 args.gmtoff = 0; 289 290 /* 291 * If updating, check whether changing from read-only to 292 * read/write; if there is no device name, that's all we do. 293 */ 294 if (mp->mnt_flag & MNT_UPDATE) { 295 pmp = VFSTOMSDOSFS(mp); 296 error = 0; 297 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_RDONLY)) { 298 flags = WRITECLOSE; 299 if (mp->mnt_flag & MNT_FORCE) 300 flags |= FORCECLOSE; 301 error = vflush(mp, NULLVP, flags); 302 } 303 if (!error && (mp->mnt_flag & MNT_RELOAD)) 304 /* not yet implemented */ 305 error = EOPNOTSUPP; 306 if (error) 307 return (error); 308 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_iflag & IMNT_WANTRDWR)) { 309 /* 310 * If upgrade to read-write by non-root, then verify 311 * that user has necessary permissions on the device. 312 */ 313 if (p->p_ucred->cr_uid != 0) { 314 devvp = pmp->pm_devvp; 315 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 316 error = VOP_ACCESS(devvp, VREAD | VWRITE, 317 p->p_ucred, p); 318 VOP_UNLOCK(devvp, 0); 319 if (error) 320 return (error); 321 } 322 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 323 } 324 if (args.fspec == 0) { 325 #ifdef __notyet__ /* doesn't work correctly with current mountd XXX */ 326 if (args.flags & MSDOSFSMNT_MNTOPT) { 327 pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT; 328 pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT; 329 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 330 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 331 } 332 #endif 333 /* 334 * Process export requests. 335 */ 336 return (vfs_export(mp, &pmp->pm_export, &args.export)); 337 } 338 } 339 /* 340 * Not an update, or updating the name: look up the name 341 * and verify that it refers to a sensible block device. 342 */ 343 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p); 344 if ((error = namei(ndp)) != 0) 345 return (error); 346 devvp = ndp->ni_vp; 347 348 if (devvp->v_type != VBLK) { 349 vrele(devvp); 350 return (ENOTBLK); 351 } 352 if (bdevsw_lookup(devvp->v_rdev) == NULL) { 353 vrele(devvp); 354 return (ENXIO); 355 } 356 /* 357 * If mount by non-root, then verify that user has necessary 358 * permissions on the device. 359 */ 360 if (p->p_ucred->cr_uid != 0) { 361 accessmode = VREAD; 362 if ((mp->mnt_flag & MNT_RDONLY) == 0) 363 accessmode |= VWRITE; 364 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 365 error = VOP_ACCESS(devvp, accessmode, p->p_ucred, p); 366 VOP_UNLOCK(devvp, 0); 367 if (error) { 368 vrele(devvp); 369 return (error); 370 } 371 } 372 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 373 int flags; 374 375 /* 376 * Disallow multiple mounts of the same device. 377 * Disallow mounting of a device that is currently in use 378 * (except for root, which might share swap device for 379 * miniroot). 380 */ 381 error = vfs_mountedon(devvp); 382 if (error) 383 goto fail; 384 if (vcount(devvp) > 1 && devvp != rootvp) { 385 error = EBUSY; 386 goto fail; 387 } 388 if (mp->mnt_flag & MNT_RDONLY) 389 flags = FREAD; 390 else 391 flags = FREAD|FWRITE; 392 error = VOP_OPEN(devvp, flags, FSCRED, p); 393 if (error) 394 goto fail; 395 error = msdosfs_mountfs(devvp, mp, p, &args); 396 if (error) { 397 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 398 (void) VOP_CLOSE(devvp, flags, NOCRED, p); 399 VOP_UNLOCK(devvp, 0); 400 goto fail; 401 } 402 #ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 403 pmp = VFSTOMSDOSFS(mp); 404 #endif 405 } else { 406 vrele(devvp); 407 if (devvp != pmp->pm_devvp) 408 return (EINVAL); /* needs translation */ 409 } 410 if ((error = update_mp(mp, &args)) != 0) { 411 msdosfs_unmount(mp, MNT_FORCE, p); 412 return error; 413 } 414 415 #ifdef MSDOSFS_DEBUG 416 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 417 #endif 418 return set_statvfs_info(path, UIO_USERSPACE, args.fspec, UIO_USERSPACE, 419 mp, p); 420 421 fail: 422 vrele(devvp); 423 return (error); 424 } 425 426 int 427 msdosfs_mountfs(devvp, mp, p, argp) 428 struct vnode *devvp; 429 struct mount *mp; 430 struct proc *p; 431 struct msdosfs_args *argp; 432 { 433 struct msdosfsmount *pmp; 434 struct buf *bp; 435 dev_t dev = devvp->v_rdev; 436 struct partinfo dpart; 437 union bootsector *bsp; 438 struct byte_bpb33 *b33; 439 struct byte_bpb50 *b50; 440 struct byte_bpb710 *b710; 441 u_int8_t SecPerClust; 442 int ronly, error; 443 int bsize = 0, dtype = 0, tmp; 444 u_long dirsperblk; 445 446 /* Flush out any old buffers remaining from a previous use. */ 447 if ((error = vinvalbuf(devvp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) 448 return (error); 449 450 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 451 452 bp = NULL; /* both used in error_exit */ 453 pmp = NULL; 454 455 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 456 /* 457 * We need the disklabel to calculate the size of a FAT entry 458 * later on. Also make sure the partition contains a filesystem 459 * of type FS_MSDOS. This doesn't work for floppies, so we have 460 * to check for them too. 461 * 462 * At least some parts of the msdos fs driver seem to assume 463 * that the size of a disk block will always be 512 bytes. 464 * Let's check it... 465 */ 466 error = VOP_IOCTL(devvp, DIOCGPART, &dpart, FREAD, NOCRED, p); 467 if (error) 468 goto error_exit; 469 tmp = dpart.part->p_fstype; 470 dtype = dpart.disklab->d_type; 471 bsize = dpart.disklab->d_secsize; 472 if (bsize != 512 || (dtype!=DTYPE_FLOPPY && tmp!=FS_MSDOS)) { 473 error = EINVAL; 474 goto error_exit; 475 } 476 } 477 478 /* 479 * Read the boot sector of the filesystem, and then check the 480 * boot signature. If not a dos boot sector then error out. 481 */ 482 if ((error = bread(devvp, 0, 512, NOCRED, &bp)) != 0) 483 goto error_exit; 484 bp->b_flags |= B_AGE; 485 bsp = (union bootsector *)bp->b_data; 486 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 487 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 488 b710 = (struct byte_bpb710 *)bsp->bs710.bsBPB; 489 490 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 491 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 492 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 493 error = EINVAL; 494 goto error_exit; 495 } 496 } 497 498 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK); 499 memset(pmp, 0, sizeof *pmp); 500 pmp->pm_mountp = mp; 501 502 /* 503 * Compute several useful quantities from the bpb in the 504 * bootsector. Copy in the dos 5 variant of the bpb then fix up 505 * the fields that are different between dos 5 and dos 3.3. 506 */ 507 SecPerClust = b50->bpbSecPerClust; 508 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 509 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 510 pmp->pm_FATs = b50->bpbFATs; 511 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 512 pmp->pm_Sectors = getushort(b50->bpbSectors); 513 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 514 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 515 pmp->pm_Heads = getushort(b50->bpbHeads); 516 pmp->pm_Media = b50->bpbMedia; 517 518 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 519 /* XXX - We should probably check more values here */ 520 if (!pmp->pm_BytesPerSec || !SecPerClust 521 || pmp->pm_Heads > 255 || pmp->pm_SecPerTrack > 63) { 522 error = EINVAL; 523 goto error_exit; 524 } 525 } 526 527 if (pmp->pm_Sectors == 0) { 528 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 529 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 530 } else { 531 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 532 pmp->pm_HugeSectors = pmp->pm_Sectors; 533 } 534 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 535 if (pmp->pm_HugeSectors > 0xffffffff / dirsperblk + 1) { 536 /* 537 * We cannot deal currently with this size of disk 538 * due to fileid limitations (see msdosfs_getattr and 539 * msdosfs_readdir) 540 */ 541 error = EINVAL; 542 goto error_exit; 543 } 544 545 if (pmp->pm_RootDirEnts == 0) { 546 if (bsp->bs710.bsBootSectSig2 != BOOTSIG2 547 || bsp->bs710.bsBootSectSig3 != BOOTSIG3 548 || pmp->pm_Sectors 549 || pmp->pm_FATsecs 550 || getushort(b710->bpbFSVers)) { 551 error = EINVAL; 552 goto error_exit; 553 } 554 pmp->pm_fatmask = FAT32_MASK; 555 pmp->pm_fatmult = 4; 556 pmp->pm_fatdiv = 1; 557 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 558 559 /* mirrorring is enabled if the FATMIRROR bit is not set */ 560 if ((getushort(b710->bpbExtFlags) & FATMIRROR) == 0) 561 pmp->pm_flags |= MSDOSFS_FATMIRROR; 562 else 563 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 564 } else 565 pmp->pm_flags |= MSDOSFS_FATMIRROR; 566 567 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 568 if (FAT32(pmp)) { 569 /* 570 * GEMDOS doesn't know fat32. 571 */ 572 error = EINVAL; 573 goto error_exit; 574 } 575 576 /* 577 * Check a few values (could do some more): 578 * - logical sector size: power of 2, >= block size 579 * - sectors per cluster: power of 2, >= 1 580 * - number of sectors: >= 1, <= size of partition 581 */ 582 if ( (SecPerClust == 0) 583 || (SecPerClust & (SecPerClust - 1)) 584 || (pmp->pm_BytesPerSec < bsize) 585 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 586 || (pmp->pm_HugeSectors == 0) 587 || (pmp->pm_HugeSectors * (pmp->pm_BytesPerSec / bsize) 588 > dpart.part->p_size) 589 ) { 590 error = EINVAL; 591 goto error_exit; 592 } 593 /* 594 * XXX - Many parts of the msdos fs driver seem to assume that 595 * the number of bytes per logical sector (BytesPerSec) will 596 * always be the same as the number of bytes per disk block 597 * Let's pretend it is. 598 */ 599 tmp = pmp->pm_BytesPerSec / bsize; 600 pmp->pm_BytesPerSec = bsize; 601 pmp->pm_HugeSectors *= tmp; 602 pmp->pm_HiddenSects *= tmp; 603 pmp->pm_ResSectors *= tmp; 604 pmp->pm_Sectors *= tmp; 605 pmp->pm_FATsecs *= tmp; 606 SecPerClust *= tmp; 607 } 608 pmp->pm_fatblk = pmp->pm_ResSectors; 609 if (FAT32(pmp)) { 610 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 611 pmp->pm_firstcluster = pmp->pm_fatblk 612 + (pmp->pm_FATs * pmp->pm_FATsecs); 613 pmp->pm_fsinfo = getushort(b710->bpbFSInfo); 614 } else { 615 pmp->pm_rootdirblk = pmp->pm_fatblk + 616 (pmp->pm_FATs * pmp->pm_FATsecs); 617 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 618 + pmp->pm_BytesPerSec - 1) 619 / pmp->pm_BytesPerSec;/* in sectors */ 620 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 621 } 622 623 pmp->pm_nmbrofclusters = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 624 SecPerClust; 625 pmp->pm_maxcluster = pmp->pm_nmbrofclusters + 1; 626 pmp->pm_fatsize = pmp->pm_FATsecs * pmp->pm_BytesPerSec; 627 628 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 629 if (pmp->pm_nmbrofclusters <= (0xff0 - 2) 630 && (dtype == DTYPE_FLOPPY 631 || (dtype == DTYPE_VND 632 && (pmp->pm_Heads == 1 || pmp->pm_Heads == 2))) 633 ) { 634 pmp->pm_fatmask = FAT12_MASK; 635 pmp->pm_fatmult = 3; 636 pmp->pm_fatdiv = 2; 637 } else { 638 pmp->pm_fatmask = FAT16_MASK; 639 pmp->pm_fatmult = 2; 640 pmp->pm_fatdiv = 1; 641 } 642 } else if (pmp->pm_fatmask == 0) { 643 if (pmp->pm_maxcluster 644 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 645 /* 646 * This will usually be a floppy disk. This size makes 647 * sure that one fat entry will not be split across 648 * multiple blocks. 649 */ 650 pmp->pm_fatmask = FAT12_MASK; 651 pmp->pm_fatmult = 3; 652 pmp->pm_fatdiv = 2; 653 } else { 654 pmp->pm_fatmask = FAT16_MASK; 655 pmp->pm_fatmult = 2; 656 pmp->pm_fatdiv = 1; 657 } 658 } 659 if (FAT12(pmp)) 660 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 661 else 662 pmp->pm_fatblocksize = MAXBSIZE; 663 664 pmp->pm_fatblocksec = pmp->pm_fatblocksize / pmp->pm_BytesPerSec; 665 pmp->pm_bnshift = ffs(pmp->pm_BytesPerSec) - 1; 666 667 /* 668 * Compute mask and shift value for isolating cluster relative byte 669 * offsets and cluster numbers from a file offset. 670 */ 671 pmp->pm_bpcluster = SecPerClust * pmp->pm_BytesPerSec; 672 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 673 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 674 675 /* 676 * Check for valid cluster size 677 * must be a power of 2 678 */ 679 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 680 error = EINVAL; 681 goto error_exit; 682 } 683 684 /* 685 * Release the bootsector buffer. 686 */ 687 brelse(bp); 688 bp = NULL; 689 690 /* 691 * Check FSInfo. 692 */ 693 if (pmp->pm_fsinfo) { 694 struct fsinfo *fp; 695 696 if ((error = bread(devvp, pmp->pm_fsinfo, 1024, NOCRED, &bp)) != 0) 697 goto error_exit; 698 fp = (struct fsinfo *)bp->b_data; 699 if (!memcmp(fp->fsisig1, "RRaA", 4) 700 && !memcmp(fp->fsisig2, "rrAa", 4) 701 && !memcmp(fp->fsisig3, "\0\0\125\252", 4) 702 && !memcmp(fp->fsisig4, "\0\0\125\252", 4)) 703 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 704 else 705 pmp->pm_fsinfo = 0; 706 brelse(bp); 707 bp = NULL; 708 } 709 710 /* 711 * Check and validate (or perhaps invalidate?) the fsinfo structure? 712 * XXX 713 */ 714 if (pmp->pm_fsinfo) { 715 if (pmp->pm_nxtfree == (u_long)-1) 716 pmp->pm_fsinfo = 0; 717 } 718 719 /* 720 * Allocate memory for the bitmap of allocated clusters, and then 721 * fill it in. 722 */ 723 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 724 / N_INUSEBITS) 725 * sizeof(*pmp->pm_inusemap), 726 M_MSDOSFSFAT, M_WAITOK); 727 728 /* 729 * fillinusemap() needs pm_devvp. 730 */ 731 pmp->pm_dev = dev; 732 pmp->pm_devvp = devvp; 733 734 /* 735 * Have the inuse map filled in. 736 */ 737 if ((error = fillinusemap(pmp)) != 0) 738 goto error_exit; 739 740 /* 741 * If they want fat updates to be synchronous then let them suffer 742 * the performance degradation in exchange for the on disk copy of 743 * the fat being correct just about all the time. I suppose this 744 * would be a good thing to turn on if the kernel is still flakey. 745 */ 746 if (mp->mnt_flag & MNT_SYNCHRONOUS) 747 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 748 749 /* 750 * Finish up. 751 */ 752 if (ronly) 753 pmp->pm_flags |= MSDOSFSMNT_RONLY; 754 else 755 pmp->pm_fmod = 1; 756 mp->mnt_data = pmp; 757 mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev; 758 mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_MSDOS); 759 mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; 760 mp->mnt_stat.f_namemax = MSDOSFS_NAMEMAX(pmp); 761 mp->mnt_flag |= MNT_LOCAL; 762 mp->mnt_dev_bshift = pmp->pm_bnshift; 763 mp->mnt_fs_bshift = pmp->pm_cnshift; 764 765 #ifdef QUOTA 766 /* 767 * If we ever do quotas for DOS filesystems this would be a place 768 * to fill in the info in the msdosfsmount structure. You dolt, 769 * quotas on dos filesystems make no sense because files have no 770 * owners on dos filesystems. of course there is some empty space 771 * in the directory entry where we could put uid's and gid's. 772 */ 773 #endif 774 devvp->v_specmountpoint = mp; 775 776 return (0); 777 778 error_exit:; 779 if (bp) 780 brelse(bp); 781 if (pmp) { 782 if (pmp->pm_inusemap) 783 free(pmp->pm_inusemap, M_MSDOSFSFAT); 784 free(pmp, M_MSDOSFSMNT); 785 mp->mnt_data = NULL; 786 } 787 return (error); 788 } 789 790 int 791 msdosfs_start(mp, flags, p) 792 struct mount *mp; 793 int flags; 794 struct proc *p; 795 { 796 797 return (0); 798 } 799 800 /* 801 * Unmount the filesystem described by mp. 802 */ 803 int 804 msdosfs_unmount(mp, mntflags, p) 805 struct mount *mp; 806 int mntflags; 807 struct proc *p; 808 { 809 struct msdosfsmount *pmp; 810 int error, flags; 811 812 flags = 0; 813 if (mntflags & MNT_FORCE) 814 flags |= FORCECLOSE; 815 #ifdef QUOTA 816 #endif 817 if ((error = vflush(mp, NULLVP, flags)) != 0) 818 return (error); 819 pmp = VFSTOMSDOSFS(mp); 820 if (pmp->pm_devvp->v_type != VBAD) 821 pmp->pm_devvp->v_specmountpoint = NULL; 822 #ifdef MSDOSFS_DEBUG 823 { 824 struct vnode *vp = pmp->pm_devvp; 825 826 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 827 printf("flag %08x, usecount %d, writecount %ld, holdcnt %ld\n", 828 vp->v_flag, vp->v_usecount, vp->v_writecount, vp->v_holdcnt); 829 printf("id %lu, mount %p, op %p\n", 830 vp->v_id, vp->v_mount, vp->v_op); 831 printf("freef %p, freeb %p, mount %p\n", 832 vp->v_freelist.tqe_next, vp->v_freelist.tqe_prev, 833 vp->v_mount); 834 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %d, type %d\n", 835 vp->v_cleanblkhd.lh_first, 836 vp->v_dirtyblkhd.lh_first, 837 vp->v_numoutput, vp->v_type); 838 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 839 vp->v_socket, vp->v_tag, 840 ((u_int *)vp->v_data)[0], 841 ((u_int *)vp->v_data)[1]); 842 } 843 #endif 844 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY); 845 error = VOP_CLOSE(pmp->pm_devvp, 846 pmp->pm_flags & MSDOSFSMNT_RONLY ? FREAD : FREAD|FWRITE, NOCRED, p); 847 vput(pmp->pm_devvp); 848 free(pmp->pm_inusemap, M_MSDOSFSFAT); 849 free(pmp, M_MSDOSFSMNT); 850 mp->mnt_data = NULL; 851 mp->mnt_flag &= ~MNT_LOCAL; 852 return (error); 853 } 854 855 int 856 msdosfs_root(mp, vpp) 857 struct mount *mp; 858 struct vnode **vpp; 859 { 860 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 861 struct denode *ndep; 862 int error; 863 864 #ifdef MSDOSFS_DEBUG 865 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 866 #endif 867 if ((error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep)) != 0) 868 return (error); 869 *vpp = DETOV(ndep); 870 return (0); 871 } 872 873 int 874 msdosfs_quotactl(mp, cmds, uid, arg, p) 875 struct mount *mp; 876 int cmds; 877 uid_t uid; 878 void *arg; 879 struct proc *p; 880 { 881 882 #ifdef QUOTA 883 return (EOPNOTSUPP); 884 #else 885 return (EOPNOTSUPP); 886 #endif 887 } 888 889 int 890 msdosfs_statvfs(mp, sbp, p) 891 struct mount *mp; 892 struct statvfs *sbp; 893 struct proc *p; 894 { 895 struct msdosfsmount *pmp; 896 897 pmp = VFSTOMSDOSFS(mp); 898 sbp->f_bsize = pmp->pm_bpcluster; 899 sbp->f_frsize = sbp->f_bsize; 900 sbp->f_iosize = pmp->pm_bpcluster; 901 sbp->f_blocks = pmp->pm_nmbrofclusters; 902 sbp->f_bfree = pmp->pm_freeclustercount; 903 sbp->f_bavail = pmp->pm_freeclustercount; 904 sbp->f_bresvd = 0; 905 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 906 sbp->f_ffree = 0; /* what to put in here? */ 907 sbp->f_favail = 0; /* what to put in here? */ 908 sbp->f_fresvd = 0; 909 copy_statvfs_info(sbp, mp); 910 return (0); 911 } 912 913 int 914 msdosfs_sync(mp, waitfor, cred, p) 915 struct mount *mp; 916 int waitfor; 917 struct ucred *cred; 918 struct proc *p; 919 { 920 struct vnode *vp, *nvp; 921 struct denode *dep; 922 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 923 int error, allerror = 0; 924 925 /* 926 * If we ever switch to not updating all of the fats all the time, 927 * this would be the place to update them from the first one. 928 */ 929 if (pmp->pm_fmod != 0) { 930 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 931 panic("msdosfs_sync: rofs mod"); 932 else { 933 /* update fats here */ 934 } 935 } 936 /* 937 * Write back each (modified) denode. 938 */ 939 simple_lock(&mntvnode_slock); 940 loop: 941 for (vp = mp->mnt_vnodelist.lh_first; vp != NULL; vp = nvp) { 942 /* 943 * If the vnode that we are about to sync is no longer 944 * assoicated with this mount point, start over. 945 */ 946 if (vp->v_mount != mp) 947 goto loop; 948 simple_lock(&vp->v_interlock); 949 nvp = vp->v_mntvnodes.le_next; 950 dep = VTODE(vp); 951 if (waitfor == MNT_LAZY || vp->v_type == VNON || 952 (((dep->de_flag & 953 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0) && 954 (LIST_EMPTY(&vp->v_dirtyblkhd) && 955 vp->v_uobj.uo_npages == 0))) { 956 simple_unlock(&vp->v_interlock); 957 continue; 958 } 959 simple_unlock(&mntvnode_slock); 960 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK); 961 if (error) { 962 simple_lock(&mntvnode_slock); 963 if (error == ENOENT) 964 goto loop; 965 continue; 966 } 967 if ((error = VOP_FSYNC(vp, cred, 968 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0, p)) != 0) 969 allerror = error; 970 vput(vp); 971 simple_lock(&mntvnode_slock); 972 } 973 simple_unlock(&mntvnode_slock); 974 /* 975 * Force stale file system control information to be flushed. 976 */ 977 if ((error = VOP_FSYNC(pmp->pm_devvp, cred, 978 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0, p)) != 0) 979 allerror = error; 980 #ifdef QUOTA 981 /* qsync(mp); */ 982 #endif 983 return (allerror); 984 } 985 986 int 987 msdosfs_fhtovp(mp, fhp, vpp) 988 struct mount *mp; 989 struct fid *fhp; 990 struct vnode **vpp; 991 { 992 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 993 struct defid *defhp = (struct defid *) fhp; 994 struct denode *dep; 995 int error; 996 997 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 998 if (error) { 999 *vpp = NULLVP; 1000 return (error); 1001 } 1002 *vpp = DETOV(dep); 1003 return (0); 1004 } 1005 1006 int 1007 msdosfs_checkexp(mp, nam, exflagsp, credanonp) 1008 struct mount *mp; 1009 struct mbuf *nam; 1010 int *exflagsp; 1011 struct ucred **credanonp; 1012 { 1013 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 1014 struct netcred *np; 1015 1016 np = vfs_export_lookup(mp, &pmp->pm_export, nam); 1017 if (np == NULL) 1018 return (EACCES); 1019 *exflagsp = np->netc_exflags; 1020 *credanonp = &np->netc_anon; 1021 return (0); 1022 } 1023 1024 int 1025 msdosfs_vptofh(vp, fhp) 1026 struct vnode *vp; 1027 struct fid *fhp; 1028 { 1029 struct denode *dep; 1030 struct defid *defhp; 1031 1032 dep = VTODE(vp); 1033 defhp = (struct defid *)fhp; 1034 defhp->defid_len = sizeof(struct defid); 1035 defhp->defid_dirclust = dep->de_dirclust; 1036 defhp->defid_dirofs = dep->de_diroffset; 1037 /* defhp->defid_gen = dep->de_gen; */ 1038 return (0); 1039 } 1040 1041 int 1042 msdosfs_vget(mp, ino, vpp) 1043 struct mount *mp; 1044 ino_t ino; 1045 struct vnode **vpp; 1046 { 1047 1048 return (EOPNOTSUPP); 1049 } 1050 1051 SYSCTL_SETUP(sysctl_vfs_msdosfs_setup, "sysctl vfs.msdosfs subtree setup") 1052 { 1053 1054 sysctl_createv(clog, 0, NULL, NULL, 1055 CTLFLAG_PERMANENT, 1056 CTLTYPE_NODE, "vfs", NULL, 1057 NULL, 0, NULL, 0, 1058 CTL_VFS, CTL_EOL); 1059 sysctl_createv(clog, 0, NULL, NULL, 1060 CTLFLAG_PERMANENT, 1061 CTLTYPE_NODE, "msdosfs", 1062 SYSCTL_DESCR("MS-DOS file system"), 1063 NULL, 0, NULL, 0, 1064 CTL_VFS, 4, CTL_EOL); 1065 /* 1066 * XXX the "4" above could be dynamic, thereby eliminating one 1067 * more instance of the "number to vfs" mapping problem, but 1068 * "4" is the order as taken from sys/mount.h 1069 */ 1070 } 1071