1 /* $NetBSD: msdosfs_vfsops.c,v 1.22 2005/01/09 03:11:48 mycroft 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 1.22 2005/01/09 03:11:48 mycroft 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 }; 141 142 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 *rootvp; 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, &rootvp)) != 0) 176 return error; 177 pmp->pm_flags |= findwin95(VTODE(rootvp)) 178 ? MSDOSFSMNT_LONGNAME 179 : MSDOSFSMNT_SHORTNAME; 180 vput(rootvp); 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 proc *p = curproc; /* XXX */ 194 int error; 195 struct msdosfs_args args; 196 197 if (root_device->dv_class != 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, p, &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, p); 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, p); 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, p) 242 struct mount *mp; 243 const char *path; 244 void *data; 245 struct nameidata *ndp; 246 struct proc *p; 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 vfs_showexport(mp, &args.export, &pmp->pm_export); 268 return copyout(&args, data, sizeof(args)); 269 } 270 error = copyin(data, &args, sizeof(struct msdosfs_args)); 271 if (error) 272 return (error); 273 274 /* 275 * If not versioned (i.e. using old mount_msdos(8)), fill in 276 * the additional structure items with suitable defaults. 277 */ 278 if ((args.flags & MSDOSFSMNT_VERSIONED) == 0) { 279 args.version = 1; 280 args.dirmask = args.mask; 281 } 282 283 /* 284 * Reset GMT offset for pre-v3 mount structure args. 285 */ 286 if (args.version < 3) 287 args.gmtoff = 0; 288 289 /* 290 * If updating, check whether changing from read-only to 291 * read/write; if there is no device name, that's all we do. 292 */ 293 if (mp->mnt_flag & MNT_UPDATE) { 294 pmp = VFSTOMSDOSFS(mp); 295 error = 0; 296 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_RDONLY)) { 297 flags = WRITECLOSE; 298 if (mp->mnt_flag & MNT_FORCE) 299 flags |= FORCECLOSE; 300 error = vflush(mp, NULLVP, flags); 301 } 302 if (!error && (mp->mnt_flag & MNT_RELOAD)) 303 /* not yet implemented */ 304 error = EOPNOTSUPP; 305 if (error) 306 return (error); 307 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_iflag & IMNT_WANTRDWR)) { 308 /* 309 * If upgrade to read-write by non-root, then verify 310 * that user has necessary permissions on the device. 311 */ 312 if (p->p_ucred->cr_uid != 0) { 313 devvp = pmp->pm_devvp; 314 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 315 error = VOP_ACCESS(devvp, VREAD | VWRITE, 316 p->p_ucred, p); 317 VOP_UNLOCK(devvp, 0); 318 if (error) 319 return (error); 320 } 321 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 322 } 323 if (args.fspec == 0) { 324 #ifdef __notyet__ /* doesn't work correctly with current mountd XXX */ 325 if (args.flags & MSDOSFSMNT_MNTOPT) { 326 pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT; 327 pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT; 328 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 329 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 330 } 331 #endif 332 /* 333 * Process export requests. 334 */ 335 return (vfs_export(mp, &pmp->pm_export, &args.export)); 336 } 337 } 338 /* 339 * Not an update, or updating the name: look up the name 340 * and verify that it refers to a sensible block device. 341 */ 342 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p); 343 if ((error = namei(ndp)) != 0) 344 return (error); 345 devvp = ndp->ni_vp; 346 347 if (devvp->v_type != VBLK) { 348 vrele(devvp); 349 return (ENOTBLK); 350 } 351 if (bdevsw_lookup(devvp->v_rdev) == NULL) { 352 vrele(devvp); 353 return (ENXIO); 354 } 355 /* 356 * If mount by non-root, then verify that user has necessary 357 * permissions on the device. 358 */ 359 if (p->p_ucred->cr_uid != 0) { 360 accessmode = VREAD; 361 if ((mp->mnt_flag & MNT_RDONLY) == 0) 362 accessmode |= VWRITE; 363 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 364 error = VOP_ACCESS(devvp, accessmode, p->p_ucred, p); 365 VOP_UNLOCK(devvp, 0); 366 if (error) { 367 vrele(devvp); 368 return (error); 369 } 370 } 371 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 372 int flags; 373 374 /* 375 * Disallow multiple mounts of the same device. 376 * Disallow mounting of a device that is currently in use 377 * (except for root, which might share swap device for 378 * miniroot). 379 */ 380 error = vfs_mountedon(devvp); 381 if (error) 382 goto fail; 383 if (vcount(devvp) > 1 && devvp != rootvp) { 384 error = EBUSY; 385 goto fail; 386 } 387 if (mp->mnt_flag & MNT_RDONLY) 388 flags = FREAD; 389 else 390 flags = FREAD|FWRITE; 391 error = VOP_OPEN(devvp, flags, FSCRED, p); 392 if (error) 393 goto fail; 394 error = msdosfs_mountfs(devvp, mp, p, &args); 395 if (error) { 396 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 397 (void) VOP_CLOSE(devvp, flags, NOCRED, p); 398 VOP_UNLOCK(devvp, 0); 399 goto fail; 400 } 401 #ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 402 pmp = VFSTOMSDOSFS(mp); 403 #endif 404 } else { 405 vrele(devvp); 406 if (devvp != pmp->pm_devvp) 407 return (EINVAL); /* needs translation */ 408 } 409 if ((error = update_mp(mp, &args)) != 0) { 410 msdosfs_unmount(mp, MNT_FORCE, p); 411 return error; 412 } 413 414 #ifdef MSDOSFS_DEBUG 415 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 416 #endif 417 return set_statvfs_info(path, UIO_USERSPACE, args.fspec, UIO_USERSPACE, 418 mp, p); 419 420 fail: 421 vrele(devvp); 422 return (error); 423 } 424 425 int 426 msdosfs_mountfs(devvp, mp, p, argp) 427 struct vnode *devvp; 428 struct mount *mp; 429 struct proc *p; 430 struct msdosfs_args *argp; 431 { 432 struct msdosfsmount *pmp; 433 struct buf *bp; 434 dev_t dev = devvp->v_rdev; 435 struct partinfo dpart; 436 union bootsector *bsp; 437 struct byte_bpb33 *b33; 438 struct byte_bpb50 *b50; 439 struct byte_bpb710 *b710; 440 u_int8_t SecPerClust; 441 int ronly, error; 442 int bsize = 0, dtype = 0, tmp; 443 u_long dirsperblk; 444 445 /* Flush out any old buffers remaining from a previous use. */ 446 if ((error = vinvalbuf(devvp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) 447 return (error); 448 449 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 450 451 bp = NULL; /* both used in error_exit */ 452 pmp = NULL; 453 454 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 455 /* 456 * We need the disklabel to calculate the size of a FAT entry 457 * later on. Also make sure the partition contains a filesystem 458 * of type FS_MSDOS. This doesn't work for floppies, so we have 459 * to check for them too. 460 * 461 * At least some parts of the msdos fs driver seem to assume 462 * that the size of a disk block will always be 512 bytes. 463 * Let's check it... 464 */ 465 error = VOP_IOCTL(devvp, DIOCGPART, &dpart, FREAD, NOCRED, p); 466 if (error) 467 goto error_exit; 468 tmp = dpart.part->p_fstype; 469 dtype = dpart.disklab->d_type; 470 bsize = dpart.disklab->d_secsize; 471 if (bsize != 512 || (dtype!=DTYPE_FLOPPY && tmp!=FS_MSDOS)) { 472 error = EINVAL; 473 goto error_exit; 474 } 475 } 476 477 /* 478 * Read the boot sector of the filesystem, and then check the 479 * boot signature. If not a dos boot sector then error out. 480 */ 481 if ((error = bread(devvp, 0, 512, NOCRED, &bp)) != 0) 482 goto error_exit; 483 bp->b_flags |= B_AGE; 484 bsp = (union bootsector *)bp->b_data; 485 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 486 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 487 b710 = (struct byte_bpb710 *)bsp->bs710.bsBPB; 488 489 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 490 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 491 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 492 error = EINVAL; 493 goto error_exit; 494 } 495 } 496 497 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK); 498 memset(pmp, 0, sizeof *pmp); 499 pmp->pm_mountp = mp; 500 501 /* 502 * Compute several useful quantities from the bpb in the 503 * bootsector. Copy in the dos 5 variant of the bpb then fix up 504 * the fields that are different between dos 5 and dos 3.3. 505 */ 506 SecPerClust = b50->bpbSecPerClust; 507 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 508 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 509 pmp->pm_FATs = b50->bpbFATs; 510 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 511 pmp->pm_Sectors = getushort(b50->bpbSectors); 512 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 513 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 514 pmp->pm_Heads = getushort(b50->bpbHeads); 515 pmp->pm_Media = b50->bpbMedia; 516 517 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 518 /* XXX - We should probably check more values here */ 519 if (!pmp->pm_BytesPerSec || !SecPerClust 520 || pmp->pm_Heads > 255 || pmp->pm_SecPerTrack > 63) { 521 error = EINVAL; 522 goto error_exit; 523 } 524 } 525 526 if (pmp->pm_Sectors == 0) { 527 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 528 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 529 } else { 530 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 531 pmp->pm_HugeSectors = pmp->pm_Sectors; 532 } 533 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 534 if (pmp->pm_HugeSectors > 0xffffffff / dirsperblk + 1) { 535 /* 536 * We cannot deal currently with this size of disk 537 * due to fileid limitations (see msdosfs_getattr and 538 * msdosfs_readdir) 539 */ 540 error = EINVAL; 541 goto error_exit; 542 } 543 544 if (pmp->pm_RootDirEnts == 0) { 545 if (bsp->bs710.bsBootSectSig2 != BOOTSIG2 546 || bsp->bs710.bsBootSectSig3 != BOOTSIG3 547 || pmp->pm_Sectors 548 || pmp->pm_FATsecs 549 || getushort(b710->bpbFSVers)) { 550 error = EINVAL; 551 goto error_exit; 552 } 553 pmp->pm_fatmask = FAT32_MASK; 554 pmp->pm_fatmult = 4; 555 pmp->pm_fatdiv = 1; 556 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 557 558 /* mirrorring is enabled if the FATMIRROR bit is not set */ 559 if ((getushort(b710->bpbExtFlags) & FATMIRROR) == 0) 560 pmp->pm_flags |= MSDOSFS_FATMIRROR; 561 else 562 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 563 } else 564 pmp->pm_flags |= MSDOSFS_FATMIRROR; 565 566 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 567 if (FAT32(pmp)) { 568 /* 569 * GEMDOS doesn't know fat32. 570 */ 571 error = EINVAL; 572 goto error_exit; 573 } 574 575 /* 576 * Check a few values (could do some more): 577 * - logical sector size: power of 2, >= block size 578 * - sectors per cluster: power of 2, >= 1 579 * - number of sectors: >= 1, <= size of partition 580 */ 581 if ( (SecPerClust == 0) 582 || (SecPerClust & (SecPerClust - 1)) 583 || (pmp->pm_BytesPerSec < bsize) 584 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 585 || (pmp->pm_HugeSectors == 0) 586 || (pmp->pm_HugeSectors * (pmp->pm_BytesPerSec / bsize) 587 > dpart.part->p_size) 588 ) { 589 error = EINVAL; 590 goto error_exit; 591 } 592 /* 593 * XXX - Many parts of the msdos fs driver seem to assume that 594 * the number of bytes per logical sector (BytesPerSec) will 595 * always be the same as the number of bytes per disk block 596 * Let's pretend it is. 597 */ 598 tmp = pmp->pm_BytesPerSec / bsize; 599 pmp->pm_BytesPerSec = bsize; 600 pmp->pm_HugeSectors *= tmp; 601 pmp->pm_HiddenSects *= tmp; 602 pmp->pm_ResSectors *= tmp; 603 pmp->pm_Sectors *= tmp; 604 pmp->pm_FATsecs *= tmp; 605 SecPerClust *= tmp; 606 } 607 pmp->pm_fatblk = pmp->pm_ResSectors; 608 if (FAT32(pmp)) { 609 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 610 pmp->pm_firstcluster = pmp->pm_fatblk 611 + (pmp->pm_FATs * pmp->pm_FATsecs); 612 pmp->pm_fsinfo = getushort(b710->bpbFSInfo); 613 } else { 614 pmp->pm_rootdirblk = pmp->pm_fatblk + 615 (pmp->pm_FATs * pmp->pm_FATsecs); 616 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 617 + pmp->pm_BytesPerSec - 1) 618 / pmp->pm_BytesPerSec;/* in sectors */ 619 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 620 } 621 622 pmp->pm_nmbrofclusters = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 623 SecPerClust; 624 pmp->pm_maxcluster = pmp->pm_nmbrofclusters + 1; 625 pmp->pm_fatsize = pmp->pm_FATsecs * pmp->pm_BytesPerSec; 626 627 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 628 if (pmp->pm_nmbrofclusters <= (0xff0 - 2) 629 && (dtype == DTYPE_FLOPPY 630 || (dtype == DTYPE_VND 631 && (pmp->pm_Heads == 1 || pmp->pm_Heads == 2))) 632 ) { 633 pmp->pm_fatmask = FAT12_MASK; 634 pmp->pm_fatmult = 3; 635 pmp->pm_fatdiv = 2; 636 } else { 637 pmp->pm_fatmask = FAT16_MASK; 638 pmp->pm_fatmult = 2; 639 pmp->pm_fatdiv = 1; 640 } 641 } else if (pmp->pm_fatmask == 0) { 642 if (pmp->pm_maxcluster 643 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 644 /* 645 * This will usually be a floppy disk. This size makes 646 * sure that one fat entry will not be split across 647 * multiple blocks. 648 */ 649 pmp->pm_fatmask = FAT12_MASK; 650 pmp->pm_fatmult = 3; 651 pmp->pm_fatdiv = 2; 652 } else { 653 pmp->pm_fatmask = FAT16_MASK; 654 pmp->pm_fatmult = 2; 655 pmp->pm_fatdiv = 1; 656 } 657 } 658 if (FAT12(pmp)) 659 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 660 else 661 pmp->pm_fatblocksize = MAXBSIZE; 662 663 pmp->pm_fatblocksec = pmp->pm_fatblocksize / pmp->pm_BytesPerSec; 664 pmp->pm_bnshift = ffs(pmp->pm_BytesPerSec) - 1; 665 666 /* 667 * Compute mask and shift value for isolating cluster relative byte 668 * offsets and cluster numbers from a file offset. 669 */ 670 pmp->pm_bpcluster = SecPerClust * pmp->pm_BytesPerSec; 671 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 672 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 673 674 /* 675 * Check for valid cluster size 676 * must be a power of 2 677 */ 678 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 679 error = EINVAL; 680 goto error_exit; 681 } 682 683 /* 684 * Release the bootsector buffer. 685 */ 686 brelse(bp); 687 bp = NULL; 688 689 /* 690 * Check FSInfo. 691 */ 692 if (pmp->pm_fsinfo) { 693 struct fsinfo *fp; 694 695 if ((error = bread(devvp, pmp->pm_fsinfo, 1024, NOCRED, &bp)) != 0) 696 goto error_exit; 697 fp = (struct fsinfo *)bp->b_data; 698 if (!memcmp(fp->fsisig1, "RRaA", 4) 699 && !memcmp(fp->fsisig2, "rrAa", 4) 700 && !memcmp(fp->fsisig3, "\0\0\125\252", 4) 701 && !memcmp(fp->fsisig4, "\0\0\125\252", 4)) 702 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 703 else 704 pmp->pm_fsinfo = 0; 705 brelse(bp); 706 bp = NULL; 707 } 708 709 /* 710 * Check and validate (or perhaps invalidate?) the fsinfo structure? 711 * XXX 712 */ 713 if (pmp->pm_fsinfo) { 714 if (pmp->pm_nxtfree == (u_long)-1) 715 pmp->pm_fsinfo = 0; 716 } 717 718 /* 719 * Allocate memory for the bitmap of allocated clusters, and then 720 * fill it in. 721 */ 722 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 723 / N_INUSEBITS) 724 * sizeof(*pmp->pm_inusemap), 725 M_MSDOSFSFAT, M_WAITOK); 726 727 /* 728 * fillinusemap() needs pm_devvp. 729 */ 730 pmp->pm_dev = dev; 731 pmp->pm_devvp = devvp; 732 733 /* 734 * Have the inuse map filled in. 735 */ 736 if ((error = fillinusemap(pmp)) != 0) 737 goto error_exit; 738 739 /* 740 * If they want fat updates to be synchronous then let them suffer 741 * the performance degradation in exchange for the on disk copy of 742 * the fat being correct just about all the time. I suppose this 743 * would be a good thing to turn on if the kernel is still flakey. 744 */ 745 if (mp->mnt_flag & MNT_SYNCHRONOUS) 746 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 747 748 /* 749 * Finish up. 750 */ 751 if (ronly) 752 pmp->pm_flags |= MSDOSFSMNT_RONLY; 753 else 754 pmp->pm_fmod = 1; 755 mp->mnt_data = pmp; 756 mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev; 757 mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_MSDOS); 758 mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; 759 mp->mnt_stat.f_namemax = MSDOSFS_NAMEMAX(pmp); 760 mp->mnt_flag |= MNT_LOCAL; 761 mp->mnt_dev_bshift = pmp->pm_bnshift; 762 mp->mnt_fs_bshift = pmp->pm_cnshift; 763 764 #ifdef QUOTA 765 /* 766 * If we ever do quotas for DOS filesystems this would be a place 767 * to fill in the info in the msdosfsmount structure. You dolt, 768 * quotas on dos filesystems make no sense because files have no 769 * owners on dos filesystems. of course there is some empty space 770 * in the directory entry where we could put uid's and gid's. 771 */ 772 #endif 773 devvp->v_specmountpoint = mp; 774 775 return (0); 776 777 error_exit:; 778 if (bp) 779 brelse(bp); 780 if (pmp) { 781 if (pmp->pm_inusemap) 782 free(pmp->pm_inusemap, M_MSDOSFSFAT); 783 free(pmp, M_MSDOSFSMNT); 784 mp->mnt_data = NULL; 785 } 786 return (error); 787 } 788 789 int 790 msdosfs_start(mp, flags, p) 791 struct mount *mp; 792 int flags; 793 struct proc *p; 794 { 795 796 return (0); 797 } 798 799 /* 800 * Unmount the filesystem described by mp. 801 */ 802 int 803 msdosfs_unmount(mp, mntflags, p) 804 struct mount *mp; 805 int mntflags; 806 struct proc *p; 807 { 808 struct msdosfsmount *pmp; 809 int error, flags; 810 811 flags = 0; 812 if (mntflags & MNT_FORCE) 813 flags |= FORCECLOSE; 814 #ifdef QUOTA 815 #endif 816 if ((error = vflush(mp, NULLVP, flags)) != 0) 817 return (error); 818 pmp = VFSTOMSDOSFS(mp); 819 if (pmp->pm_devvp->v_type != VBAD) 820 pmp->pm_devvp->v_specmountpoint = NULL; 821 #ifdef MSDOSFS_DEBUG 822 { 823 struct vnode *vp = pmp->pm_devvp; 824 825 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 826 printf("flag %08x, usecount %d, writecount %ld, holdcnt %ld\n", 827 vp->v_flag, vp->v_usecount, vp->v_writecount, vp->v_holdcnt); 828 printf("id %lu, mount %p, op %p\n", 829 vp->v_id, vp->v_mount, vp->v_op); 830 printf("freef %p, freeb %p, mount %p\n", 831 vp->v_freelist.tqe_next, vp->v_freelist.tqe_prev, 832 vp->v_mount); 833 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %d, type %d\n", 834 vp->v_cleanblkhd.lh_first, 835 vp->v_dirtyblkhd.lh_first, 836 vp->v_numoutput, vp->v_type); 837 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 838 vp->v_socket, vp->v_tag, 839 ((u_int *)vp->v_data)[0], 840 ((u_int *)vp->v_data)[1]); 841 } 842 #endif 843 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY); 844 error = VOP_CLOSE(pmp->pm_devvp, 845 pmp->pm_flags & MSDOSFSMNT_RONLY ? FREAD : FREAD|FWRITE, NOCRED, p); 846 vput(pmp->pm_devvp); 847 free(pmp->pm_inusemap, M_MSDOSFSFAT); 848 free(pmp, M_MSDOSFSMNT); 849 mp->mnt_data = NULL; 850 mp->mnt_flag &= ~MNT_LOCAL; 851 return (error); 852 } 853 854 int 855 msdosfs_root(mp, vpp) 856 struct mount *mp; 857 struct vnode **vpp; 858 { 859 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 860 struct denode *ndep; 861 int error; 862 863 #ifdef MSDOSFS_DEBUG 864 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 865 #endif 866 if ((error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep)) != 0) 867 return (error); 868 *vpp = DETOV(ndep); 869 return (0); 870 } 871 872 int 873 msdosfs_quotactl(mp, cmds, uid, arg, p) 874 struct mount *mp; 875 int cmds; 876 uid_t uid; 877 void *arg; 878 struct proc *p; 879 { 880 881 #ifdef QUOTA 882 return (EOPNOTSUPP); 883 #else 884 return (EOPNOTSUPP); 885 #endif 886 } 887 888 int 889 msdosfs_statvfs(mp, sbp, p) 890 struct mount *mp; 891 struct statvfs *sbp; 892 struct proc *p; 893 { 894 struct msdosfsmount *pmp; 895 896 pmp = VFSTOMSDOSFS(mp); 897 sbp->f_bsize = pmp->pm_bpcluster; 898 sbp->f_frsize = sbp->f_bsize; 899 sbp->f_iosize = pmp->pm_bpcluster; 900 sbp->f_blocks = pmp->pm_nmbrofclusters; 901 sbp->f_bfree = pmp->pm_freeclustercount; 902 sbp->f_bavail = pmp->pm_freeclustercount; 903 sbp->f_bresvd = 0; 904 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 905 sbp->f_ffree = 0; /* what to put in here? */ 906 sbp->f_favail = 0; /* what to put in here? */ 907 sbp->f_fresvd = 0; 908 copy_statvfs_info(sbp, mp); 909 return (0); 910 } 911 912 int 913 msdosfs_sync(mp, waitfor, cred, p) 914 struct mount *mp; 915 int waitfor; 916 struct ucred *cred; 917 struct proc *p; 918 { 919 struct vnode *vp, *nvp; 920 struct denode *dep; 921 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 922 int error, allerror = 0; 923 924 /* 925 * If we ever switch to not updating all of the fats all the time, 926 * this would be the place to update them from the first one. 927 */ 928 if (pmp->pm_fmod != 0) { 929 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 930 panic("msdosfs_sync: rofs mod"); 931 else { 932 /* update fats here */ 933 } 934 } 935 /* 936 * Write back each (modified) denode. 937 */ 938 simple_lock(&mntvnode_slock); 939 loop: 940 for (vp = mp->mnt_vnodelist.lh_first; vp != NULL; vp = nvp) { 941 /* 942 * If the vnode that we are about to sync is no longer 943 * assoicated with this mount point, start over. 944 */ 945 if (vp->v_mount != mp) 946 goto loop; 947 simple_lock(&vp->v_interlock); 948 nvp = vp->v_mntvnodes.le_next; 949 dep = VTODE(vp); 950 if (waitfor == MNT_LAZY || vp->v_type == VNON || 951 (((dep->de_flag & 952 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0) && 953 (LIST_EMPTY(&vp->v_dirtyblkhd) && 954 vp->v_uobj.uo_npages == 0))) { 955 simple_unlock(&vp->v_interlock); 956 continue; 957 } 958 simple_unlock(&mntvnode_slock); 959 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK); 960 if (error) { 961 simple_lock(&mntvnode_slock); 962 if (error == ENOENT) 963 goto loop; 964 continue; 965 } 966 if ((error = VOP_FSYNC(vp, cred, 967 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0, p)) != 0) 968 allerror = error; 969 vput(vp); 970 simple_lock(&mntvnode_slock); 971 } 972 simple_unlock(&mntvnode_slock); 973 /* 974 * Force stale file system control information to be flushed. 975 */ 976 if ((error = VOP_FSYNC(pmp->pm_devvp, cred, 977 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0, p)) != 0) 978 allerror = error; 979 #ifdef QUOTA 980 /* qsync(mp); */ 981 #endif 982 return (allerror); 983 } 984 985 int 986 msdosfs_fhtovp(mp, fhp, vpp) 987 struct mount *mp; 988 struct fid *fhp; 989 struct vnode **vpp; 990 { 991 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 992 struct defid *defhp = (struct defid *) fhp; 993 struct denode *dep; 994 int error; 995 996 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 997 if (error) { 998 *vpp = NULLVP; 999 return (error); 1000 } 1001 *vpp = DETOV(dep); 1002 return (0); 1003 } 1004 1005 int 1006 msdosfs_checkexp(mp, nam, exflagsp, credanonp) 1007 struct mount *mp; 1008 struct mbuf *nam; 1009 int *exflagsp; 1010 struct ucred **credanonp; 1011 { 1012 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 1013 struct netcred *np; 1014 1015 np = vfs_export_lookup(mp, &pmp->pm_export, nam); 1016 if (np == NULL) 1017 return (EACCES); 1018 *exflagsp = np->netc_exflags; 1019 *credanonp = &np->netc_anon; 1020 return (0); 1021 } 1022 1023 int 1024 msdosfs_vptofh(vp, fhp) 1025 struct vnode *vp; 1026 struct fid *fhp; 1027 { 1028 struct denode *dep; 1029 struct defid *defhp; 1030 1031 dep = VTODE(vp); 1032 defhp = (struct defid *)fhp; 1033 defhp->defid_len = sizeof(struct defid); 1034 defhp->defid_dirclust = dep->de_dirclust; 1035 defhp->defid_dirofs = dep->de_diroffset; 1036 /* defhp->defid_gen = dep->de_gen; */ 1037 return (0); 1038 } 1039 1040 int 1041 msdosfs_vget(mp, ino, vpp) 1042 struct mount *mp; 1043 ino_t ino; 1044 struct vnode **vpp; 1045 { 1046 1047 return (EOPNOTSUPP); 1048 } 1049 1050 SYSCTL_SETUP(sysctl_vfs_msdosfs_setup, "sysctl vfs.msdosfs subtree setup") 1051 { 1052 1053 sysctl_createv(clog, 0, NULL, NULL, 1054 CTLFLAG_PERMANENT, 1055 CTLTYPE_NODE, "vfs", NULL, 1056 NULL, 0, NULL, 0, 1057 CTL_VFS, CTL_EOL); 1058 sysctl_createv(clog, 0, NULL, NULL, 1059 CTLFLAG_PERMANENT, 1060 CTLTYPE_NODE, "msdosfs", 1061 SYSCTL_DESCR("MS-DOS file system"), 1062 NULL, 0, NULL, 0, 1063 CTL_VFS, 4, CTL_EOL); 1064 /* 1065 * XXX the "4" above could be dynamic, thereby eliminating one 1066 * more instance of the "number to vfs" mapping problem, but 1067 * "4" is the order as taken from sys/mount.h 1068 */ 1069 } 1070