1 /* $NetBSD: msdosfs_vfsops.c,v 1.31 2006/05/14 21:31:52 elad 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 1.31 2006/05/14 21:31:52 elad 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 *); 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 }; 138 VFS_ATTACH(msdosfs_vfsops); 139 140 static int 141 update_mp(mp, argp) 142 struct mount *mp; 143 struct msdosfs_args *argp; 144 { 145 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 146 int error; 147 148 pmp->pm_gid = argp->gid; 149 pmp->pm_uid = argp->uid; 150 pmp->pm_mask = argp->mask & ALLPERMS; 151 pmp->pm_dirmask = argp->dirmask & ALLPERMS; 152 pmp->pm_gmtoff = argp->gmtoff; 153 pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT; 154 155 /* 156 * GEMDOS knows nothing (yet) about win95 157 */ 158 if (pmp->pm_flags & MSDOSFSMNT_GEMDOSFS) 159 pmp->pm_flags |= MSDOSFSMNT_NOWIN95; 160 161 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 162 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 163 else if (!(pmp->pm_flags & 164 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 165 struct vnode *rtvp; 166 167 /* 168 * Try to divine whether to support Win'95 long filenames 169 */ 170 if (FAT32(pmp)) 171 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 172 else { 173 if ((error = msdosfs_root(mp, &rtvp)) != 0) 174 return error; 175 pmp->pm_flags |= findwin95(VTODE(rtvp)) 176 ? MSDOSFSMNT_LONGNAME 177 : MSDOSFSMNT_SHORTNAME; 178 vput(rtvp); 179 } 180 } 181 182 mp->mnt_stat.f_namemax = MSDOSFS_NAMEMAX(pmp); 183 184 return 0; 185 } 186 187 int 188 msdosfs_mountroot() 189 { 190 struct mount *mp; 191 struct lwp *l = curlwp; /* XXX */ 192 int error; 193 struct msdosfs_args args; 194 195 if (device_class(root_device) != DV_DISK) 196 return (ENODEV); 197 198 if ((error = vfs_rootmountalloc(MOUNT_MSDOS, "root_device", &mp))) { 199 vrele(rootvp); 200 return (error); 201 } 202 203 args.flags = MSDOSFSMNT_VERSIONED; 204 args.uid = 0; 205 args.gid = 0; 206 args.mask = 0777; 207 args.version = MSDOSFSMNT_VERSION; 208 args.dirmask = 0777; 209 210 if ((error = msdosfs_mountfs(rootvp, mp, l, &args)) != 0) { 211 mp->mnt_op->vfs_refcount--; 212 vfs_unbusy(mp); 213 free(mp, M_MOUNT); 214 return (error); 215 } 216 217 if ((error = update_mp(mp, &args)) != 0) { 218 (void)msdosfs_unmount(mp, 0, l); 219 vfs_unbusy(mp); 220 free(mp, M_MOUNT); 221 vrele(rootvp); 222 return (error); 223 } 224 225 simple_lock(&mountlist_slock); 226 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 227 simple_unlock(&mountlist_slock); 228 (void)msdosfs_statvfs(mp, &mp->mnt_stat, l); 229 vfs_unbusy(mp); 230 return (0); 231 } 232 233 /* 234 * mp - path - addr in user space of mount point (ie /usr or whatever) 235 * data - addr in user space of mount params including the name of the block 236 * special file to treat as a filesystem. 237 */ 238 int 239 msdosfs_mount(mp, path, data, ndp, l) 240 struct mount *mp; 241 const char *path; 242 void *data; 243 struct nameidata *ndp; 244 struct lwp *l; 245 { 246 struct vnode *devvp; /* vnode for blk device to mount */ 247 struct msdosfs_args args; /* will hold data from mount request */ 248 /* msdosfs specific mount control block */ 249 struct msdosfsmount *pmp = NULL; 250 struct proc *p; 251 int error, flags; 252 mode_t accessmode; 253 254 p = l->l_proc; 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(p->p_cred, KAUTH_GENERIC_ISSUSER, NULL) != 0) { 312 devvp = pmp->pm_devvp; 313 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 314 error = VOP_ACCESS(devvp, VREAD | VWRITE, 315 l->l_proc->p_cred, l); 316 VOP_UNLOCK(devvp, 0); 317 if (error) 318 return (error); 319 } 320 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 321 } 322 if (args.fspec == NULL) 323 return EINVAL; 324 } 325 /* 326 * Not an update, or updating the name: look up the name 327 * and verify that it refers to a sensible block device. 328 */ 329 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, l); 330 if ((error = namei(ndp)) != 0) 331 return (error); 332 devvp = ndp->ni_vp; 333 334 if (devvp->v_type != VBLK) { 335 vrele(devvp); 336 return (ENOTBLK); 337 } 338 if (bdevsw_lookup(devvp->v_rdev) == NULL) { 339 vrele(devvp); 340 return (ENXIO); 341 } 342 /* 343 * If mount by non-root, then verify that user has necessary 344 * permissions on the device. 345 */ 346 if (kauth_authorize_generic(p->p_cred, KAUTH_GENERIC_ISSUSER, NULL) != 0) { 347 accessmode = VREAD; 348 if ((mp->mnt_flag & MNT_RDONLY) == 0) 349 accessmode |= VWRITE; 350 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 351 error = VOP_ACCESS(devvp, accessmode, l->l_proc->p_cred, l); 352 VOP_UNLOCK(devvp, 0); 353 if (error) { 354 vrele(devvp); 355 return (error); 356 } 357 } 358 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 359 int xflags; 360 361 /* 362 * Disallow multiple mounts of the same device. 363 * Disallow mounting of a device that is currently in use 364 * (except for root, which might share swap device for 365 * miniroot). 366 */ 367 error = vfs_mountedon(devvp); 368 if (error) 369 goto fail; 370 if (vcount(devvp) > 1 && devvp != rootvp) { 371 error = EBUSY; 372 goto fail; 373 } 374 if (mp->mnt_flag & MNT_RDONLY) 375 xflags = FREAD; 376 else 377 xflags = FREAD|FWRITE; 378 error = VOP_OPEN(devvp, xflags, FSCRED, l); 379 if (error) 380 goto fail; 381 error = msdosfs_mountfs(devvp, mp, l, &args); 382 if (error) { 383 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 384 (void) VOP_CLOSE(devvp, xflags, NOCRED, l); 385 VOP_UNLOCK(devvp, 0); 386 goto fail; 387 } 388 #ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 389 pmp = VFSTOMSDOSFS(mp); 390 #endif 391 } else { 392 vrele(devvp); 393 if (devvp != pmp->pm_devvp) 394 return (EINVAL); /* needs translation */ 395 } 396 if ((error = update_mp(mp, &args)) != 0) { 397 msdosfs_unmount(mp, MNT_FORCE, l); 398 return error; 399 } 400 401 #ifdef MSDOSFS_DEBUG 402 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 403 #endif 404 return set_statvfs_info(path, UIO_USERSPACE, args.fspec, UIO_USERSPACE, 405 mp, l); 406 407 fail: 408 vrele(devvp); 409 return (error); 410 } 411 412 int 413 msdosfs_mountfs(devvp, mp, l, argp) 414 struct vnode *devvp; 415 struct mount *mp; 416 struct lwp *l; 417 struct msdosfs_args *argp; 418 { 419 struct msdosfsmount *pmp; 420 struct buf *bp; 421 dev_t dev = devvp->v_rdev; 422 struct partinfo dpart; 423 union bootsector *bsp; 424 struct byte_bpb33 *b33; 425 struct byte_bpb50 *b50; 426 struct byte_bpb710 *b710; 427 u_int8_t SecPerClust; 428 int ronly, error; 429 int bsize = 0, dtype = 0, tmp; 430 431 /* Flush out any old buffers remaining from a previous use. */ 432 if ((error = vinvalbuf(devvp, V_SAVE, l->l_proc->p_cred, l, 0, 0)) != 0) 433 return (error); 434 435 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 436 437 bp = NULL; /* both used in error_exit */ 438 pmp = NULL; 439 440 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 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 * At least some parts of the msdos fs driver seem to assume 448 * that the size of a disk block will always be 512 bytes. 449 * Let's check it... 450 */ 451 error = VOP_IOCTL(devvp, DIOCGPART, &dpart, FREAD, NOCRED, l); 452 if (error) 453 goto error_exit; 454 tmp = dpart.part->p_fstype; 455 dtype = dpart.disklab->d_type; 456 bsize = dpart.disklab->d_secsize; 457 if (bsize != 512 || (dtype!=DTYPE_FLOPPY && tmp!=FS_MSDOS)) { 458 error = EINVAL; 459 goto error_exit; 460 } 461 } 462 463 /* 464 * Read the boot sector of the filesystem, and then check the 465 * boot signature. If not a dos boot sector then error out. 466 */ 467 if ((error = bread(devvp, 0, 512, NOCRED, &bp)) != 0) 468 goto error_exit; 469 bp->b_flags |= B_AGE; 470 bsp = (union bootsector *)bp->b_data; 471 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 472 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 473 b710 = (struct byte_bpb710 *)bsp->bs710.bsBPB; 474 475 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 476 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 477 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 478 error = EINVAL; 479 goto error_exit; 480 } 481 } 482 483 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK); 484 memset(pmp, 0, sizeof *pmp); 485 pmp->pm_mountp = mp; 486 487 /* 488 * Compute several useful quantities from the bpb in the 489 * bootsector. Copy in the dos 5 variant of the bpb then fix up 490 * the fields that are different between dos 5 and dos 3.3. 491 */ 492 SecPerClust = b50->bpbSecPerClust; 493 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 494 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 495 pmp->pm_FATs = b50->bpbFATs; 496 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 497 pmp->pm_Sectors = getushort(b50->bpbSectors); 498 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 499 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 500 pmp->pm_Heads = getushort(b50->bpbHeads); 501 pmp->pm_Media = b50->bpbMedia; 502 503 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 504 /* XXX - We should probably check more values here */ 505 if (!pmp->pm_BytesPerSec || !SecPerClust 506 || pmp->pm_Heads > 255 || pmp->pm_SecPerTrack > 63) { 507 error = EINVAL; 508 goto error_exit; 509 } 510 } 511 512 if (pmp->pm_Sectors == 0) { 513 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 514 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 515 } else { 516 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 517 pmp->pm_HugeSectors = pmp->pm_Sectors; 518 } 519 520 if (pmp->pm_RootDirEnts == 0) { 521 if (bsp->bs710.bsBootSectSig2 != BOOTSIG2 522 || bsp->bs710.bsBootSectSig3 != BOOTSIG3 523 || pmp->pm_Sectors 524 || pmp->pm_FATsecs 525 || getushort(b710->bpbFSVers)) { 526 error = EINVAL; 527 goto error_exit; 528 } 529 pmp->pm_fatmask = FAT32_MASK; 530 pmp->pm_fatmult = 4; 531 pmp->pm_fatdiv = 1; 532 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 533 534 /* mirrorring is enabled if the FATMIRROR bit is not set */ 535 if ((getushort(b710->bpbExtFlags) & FATMIRROR) == 0) 536 pmp->pm_flags |= MSDOSFS_FATMIRROR; 537 else 538 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 539 } else 540 pmp->pm_flags |= MSDOSFS_FATMIRROR; 541 542 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 543 if (FAT32(pmp)) { 544 /* 545 * GEMDOS doesn't know fat32. 546 */ 547 error = EINVAL; 548 goto error_exit; 549 } 550 551 /* 552 * Check a few values (could do some more): 553 * - logical sector size: power of 2, >= block size 554 * - sectors per cluster: power of 2, >= 1 555 * - number of sectors: >= 1, <= size of partition 556 */ 557 if ( (SecPerClust == 0) 558 || (SecPerClust & (SecPerClust - 1)) 559 || (pmp->pm_BytesPerSec < bsize) 560 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 561 || (pmp->pm_HugeSectors == 0) 562 || (pmp->pm_HugeSectors * (pmp->pm_BytesPerSec / bsize) 563 > dpart.part->p_size) 564 ) { 565 error = EINVAL; 566 goto error_exit; 567 } 568 /* 569 * XXX - Many parts of the msdos fs driver seem to assume that 570 * the number of bytes per logical sector (BytesPerSec) will 571 * always be the same as the number of bytes per disk block 572 * Let's pretend it is. 573 */ 574 tmp = pmp->pm_BytesPerSec / bsize; 575 pmp->pm_BytesPerSec = bsize; 576 pmp->pm_HugeSectors *= tmp; 577 pmp->pm_HiddenSects *= tmp; 578 pmp->pm_ResSectors *= tmp; 579 pmp->pm_Sectors *= tmp; 580 pmp->pm_FATsecs *= tmp; 581 SecPerClust *= tmp; 582 } 583 pmp->pm_fatblk = pmp->pm_ResSectors; 584 if (FAT32(pmp)) { 585 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 586 pmp->pm_firstcluster = pmp->pm_fatblk 587 + (pmp->pm_FATs * pmp->pm_FATsecs); 588 pmp->pm_fsinfo = getushort(b710->bpbFSInfo); 589 } else { 590 pmp->pm_rootdirblk = pmp->pm_fatblk + 591 (pmp->pm_FATs * pmp->pm_FATsecs); 592 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 593 + pmp->pm_BytesPerSec - 1) 594 / pmp->pm_BytesPerSec;/* in sectors */ 595 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 596 } 597 598 pmp->pm_nmbrofclusters = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 599 SecPerClust; 600 pmp->pm_maxcluster = pmp->pm_nmbrofclusters + 1; 601 pmp->pm_fatsize = pmp->pm_FATsecs * pmp->pm_BytesPerSec; 602 603 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 604 if (pmp->pm_nmbrofclusters <= (0xff0 - 2) 605 && (dtype == DTYPE_FLOPPY 606 || (dtype == DTYPE_VND 607 && (pmp->pm_Heads == 1 || pmp->pm_Heads == 2))) 608 ) { 609 pmp->pm_fatmask = FAT12_MASK; 610 pmp->pm_fatmult = 3; 611 pmp->pm_fatdiv = 2; 612 } else { 613 pmp->pm_fatmask = FAT16_MASK; 614 pmp->pm_fatmult = 2; 615 pmp->pm_fatdiv = 1; 616 } 617 } else if (pmp->pm_fatmask == 0) { 618 if (pmp->pm_maxcluster 619 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 620 /* 621 * This will usually be a floppy disk. This size makes 622 * sure that one fat entry will not be split across 623 * multiple blocks. 624 */ 625 pmp->pm_fatmask = FAT12_MASK; 626 pmp->pm_fatmult = 3; 627 pmp->pm_fatdiv = 2; 628 } else { 629 pmp->pm_fatmask = FAT16_MASK; 630 pmp->pm_fatmult = 2; 631 pmp->pm_fatdiv = 1; 632 } 633 } 634 if (FAT12(pmp)) 635 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 636 else 637 pmp->pm_fatblocksize = MAXBSIZE; 638 639 pmp->pm_fatblocksec = pmp->pm_fatblocksize / pmp->pm_BytesPerSec; 640 pmp->pm_bnshift = ffs(pmp->pm_BytesPerSec) - 1; 641 642 /* 643 * Compute mask and shift value for isolating cluster relative byte 644 * offsets and cluster numbers from a file offset. 645 */ 646 pmp->pm_bpcluster = SecPerClust * pmp->pm_BytesPerSec; 647 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 648 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 649 650 /* 651 * Check for valid cluster size 652 * must be a power of 2 653 */ 654 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 655 error = EINVAL; 656 goto error_exit; 657 } 658 659 /* 660 * Release the bootsector buffer. 661 */ 662 brelse(bp); 663 bp = NULL; 664 665 /* 666 * Check FSInfo. 667 */ 668 if (pmp->pm_fsinfo) { 669 struct fsinfo *fp; 670 671 if ((error = bread(devvp, pmp->pm_fsinfo, 1024, NOCRED, &bp)) != 0) 672 goto error_exit; 673 fp = (struct fsinfo *)bp->b_data; 674 if (!memcmp(fp->fsisig1, "RRaA", 4) 675 && !memcmp(fp->fsisig2, "rrAa", 4) 676 && !memcmp(fp->fsisig3, "\0\0\125\252", 4) 677 && !memcmp(fp->fsisig4, "\0\0\125\252", 4)) 678 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 679 else 680 pmp->pm_fsinfo = 0; 681 brelse(bp); 682 bp = NULL; 683 } 684 685 /* 686 * Check and validate (or perhaps invalidate?) the fsinfo structure? 687 * XXX 688 */ 689 if (pmp->pm_fsinfo) { 690 if (pmp->pm_nxtfree == (u_long)-1) 691 pmp->pm_fsinfo = 0; 692 } 693 694 /* 695 * Allocate memory for the bitmap of allocated clusters, and then 696 * fill it in. 697 */ 698 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 699 / N_INUSEBITS) 700 * sizeof(*pmp->pm_inusemap), 701 M_MSDOSFSFAT, M_WAITOK); 702 703 /* 704 * fillinusemap() needs pm_devvp. 705 */ 706 pmp->pm_dev = dev; 707 pmp->pm_devvp = devvp; 708 709 /* 710 * Have the inuse map filled in. 711 */ 712 if ((error = fillinusemap(pmp)) != 0) 713 goto error_exit; 714 715 /* 716 * If they want fat updates to be synchronous then let them suffer 717 * the performance degradation in exchange for the on disk copy of 718 * the fat being correct just about all the time. I suppose this 719 * would be a good thing to turn on if the kernel is still flakey. 720 */ 721 if (mp->mnt_flag & MNT_SYNCHRONOUS) 722 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 723 724 /* 725 * Finish up. 726 */ 727 if (ronly) 728 pmp->pm_flags |= MSDOSFSMNT_RONLY; 729 else 730 pmp->pm_fmod = 1; 731 mp->mnt_data = pmp; 732 mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev; 733 mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_MSDOS); 734 mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; 735 mp->mnt_stat.f_namemax = MSDOSFS_NAMEMAX(pmp); 736 mp->mnt_flag |= MNT_LOCAL; 737 mp->mnt_dev_bshift = pmp->pm_bnshift; 738 mp->mnt_fs_bshift = pmp->pm_cnshift; 739 740 #ifdef QUOTA 741 /* 742 * If we ever do quotas for DOS filesystems this would be a place 743 * to fill in the info in the msdosfsmount structure. You dolt, 744 * quotas on dos filesystems make no sense because files have no 745 * owners on dos filesystems. of course there is some empty space 746 * in the directory entry where we could put uid's and gid's. 747 */ 748 #endif 749 devvp->v_specmountpoint = mp; 750 751 return (0); 752 753 error_exit:; 754 if (bp) 755 brelse(bp); 756 if (pmp) { 757 if (pmp->pm_inusemap) 758 free(pmp->pm_inusemap, M_MSDOSFSFAT); 759 free(pmp, M_MSDOSFSMNT); 760 mp->mnt_data = NULL; 761 } 762 return (error); 763 } 764 765 int 766 msdosfs_start(mp, flags, l) 767 struct mount *mp; 768 int flags; 769 struct lwp *l; 770 { 771 772 return (0); 773 } 774 775 /* 776 * Unmount the filesystem described by mp. 777 */ 778 int 779 msdosfs_unmount(mp, mntflags, l) 780 struct mount *mp; 781 int mntflags; 782 struct lwp *l; 783 { 784 struct msdosfsmount *pmp; 785 int error, flags; 786 787 flags = 0; 788 if (mntflags & MNT_FORCE) 789 flags |= FORCECLOSE; 790 #ifdef QUOTA 791 #endif 792 if ((error = vflush(mp, NULLVP, flags)) != 0) 793 return (error); 794 pmp = VFSTOMSDOSFS(mp); 795 if (pmp->pm_devvp->v_type != VBAD) 796 pmp->pm_devvp->v_specmountpoint = NULL; 797 #ifdef MSDOSFS_DEBUG 798 { 799 struct vnode *vp = pmp->pm_devvp; 800 801 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 802 printf("flag %08x, usecount %d, writecount %ld, holdcnt %ld\n", 803 vp->v_flag, vp->v_usecount, vp->v_writecount, vp->v_holdcnt); 804 printf("mount %p, op %p\n", 805 vp->v_mount, vp->v_op); 806 printf("freef %p, freeb %p, mount %p\n", 807 vp->v_freelist.tqe_next, vp->v_freelist.tqe_prev, 808 vp->v_mount); 809 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %d, type %d\n", 810 vp->v_cleanblkhd.lh_first, 811 vp->v_dirtyblkhd.lh_first, 812 vp->v_numoutput, vp->v_type); 813 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 814 vp->v_socket, vp->v_tag, 815 ((u_int *)vp->v_data)[0], 816 ((u_int *)vp->v_data)[1]); 817 } 818 #endif 819 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY); 820 error = VOP_CLOSE(pmp->pm_devvp, 821 pmp->pm_flags & MSDOSFSMNT_RONLY ? FREAD : FREAD|FWRITE, NOCRED, l); 822 vput(pmp->pm_devvp); 823 free(pmp->pm_inusemap, M_MSDOSFSFAT); 824 free(pmp, M_MSDOSFSMNT); 825 mp->mnt_data = NULL; 826 mp->mnt_flag &= ~MNT_LOCAL; 827 return (error); 828 } 829 830 int 831 msdosfs_root(mp, vpp) 832 struct mount *mp; 833 struct vnode **vpp; 834 { 835 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 836 struct denode *ndep; 837 int error; 838 839 #ifdef MSDOSFS_DEBUG 840 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 841 #endif 842 if ((error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep)) != 0) 843 return (error); 844 *vpp = DETOV(ndep); 845 return (0); 846 } 847 848 int 849 msdosfs_quotactl(mp, cmds, uid, arg, l) 850 struct mount *mp; 851 int cmds; 852 uid_t uid; 853 void *arg; 854 struct lwp *l; 855 { 856 857 #ifdef QUOTA 858 return (EOPNOTSUPP); 859 #else 860 return (EOPNOTSUPP); 861 #endif 862 } 863 864 int 865 msdosfs_statvfs(mp, sbp, l) 866 struct mount *mp; 867 struct statvfs *sbp; 868 struct lwp *l; 869 { 870 struct msdosfsmount *pmp; 871 872 pmp = VFSTOMSDOSFS(mp); 873 sbp->f_bsize = pmp->pm_bpcluster; 874 sbp->f_frsize = sbp->f_bsize; 875 sbp->f_iosize = pmp->pm_bpcluster; 876 sbp->f_blocks = pmp->pm_nmbrofclusters; 877 sbp->f_bfree = pmp->pm_freeclustercount; 878 sbp->f_bavail = pmp->pm_freeclustercount; 879 sbp->f_bresvd = 0; 880 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 881 sbp->f_ffree = 0; /* what to put in here? */ 882 sbp->f_favail = 0; /* what to put in here? */ 883 sbp->f_fresvd = 0; 884 copy_statvfs_info(sbp, mp); 885 return (0); 886 } 887 888 int 889 msdosfs_sync(mp, waitfor, cred, l) 890 struct mount *mp; 891 int waitfor; 892 kauth_cred_t cred; 893 struct lwp *l; 894 { 895 struct vnode *vp, *nvp; 896 struct denode *dep; 897 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 898 int error, allerror = 0; 899 900 /* 901 * If we ever switch to not updating all of the fats all the time, 902 * this would be the place to update them from the first one. 903 */ 904 if (pmp->pm_fmod != 0) { 905 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 906 panic("msdosfs_sync: rofs mod"); 907 else { 908 /* update fats here */ 909 } 910 } 911 /* 912 * Write back each (modified) denode. 913 */ 914 simple_lock(&mntvnode_slock); 915 loop: 916 for (vp = mp->mnt_vnodelist.lh_first; vp != NULL; vp = nvp) { 917 /* 918 * If the vnode that we are about to sync is no longer 919 * assoicated with this mount point, start over. 920 */ 921 if (vp->v_mount != mp) 922 goto loop; 923 simple_lock(&vp->v_interlock); 924 nvp = vp->v_mntvnodes.le_next; 925 dep = VTODE(vp); 926 if (waitfor == MNT_LAZY || vp->v_type == VNON || 927 (((dep->de_flag & 928 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0) && 929 (LIST_EMPTY(&vp->v_dirtyblkhd) && 930 vp->v_uobj.uo_npages == 0))) { 931 simple_unlock(&vp->v_interlock); 932 continue; 933 } 934 simple_unlock(&mntvnode_slock); 935 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK); 936 if (error) { 937 simple_lock(&mntvnode_slock); 938 if (error == ENOENT) 939 goto loop; 940 continue; 941 } 942 if ((error = VOP_FSYNC(vp, cred, 943 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0, l)) != 0) 944 allerror = error; 945 vput(vp); 946 simple_lock(&mntvnode_slock); 947 } 948 simple_unlock(&mntvnode_slock); 949 /* 950 * Force stale file system control information to be flushed. 951 */ 952 if ((error = VOP_FSYNC(pmp->pm_devvp, cred, 953 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0, l)) != 0) 954 allerror = error; 955 #ifdef QUOTA 956 /* qsync(mp); */ 957 #endif 958 return (allerror); 959 } 960 961 int 962 msdosfs_fhtovp(mp, fhp, vpp) 963 struct mount *mp; 964 struct fid *fhp; 965 struct vnode **vpp; 966 { 967 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 968 struct defid *defhp = (struct defid *) fhp; 969 struct denode *dep; 970 int error; 971 972 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 973 if (error) { 974 *vpp = NULLVP; 975 return (error); 976 } 977 *vpp = DETOV(dep); 978 return (0); 979 } 980 981 int 982 msdosfs_vptofh(vp, fhp) 983 struct vnode *vp; 984 struct fid *fhp; 985 { 986 struct denode *dep; 987 struct defid *defhp; 988 989 dep = VTODE(vp); 990 defhp = (struct defid *)fhp; 991 defhp->defid_len = sizeof(struct defid); 992 defhp->defid_dirclust = dep->de_dirclust; 993 defhp->defid_dirofs = dep->de_diroffset; 994 /* defhp->defid_gen = dep->de_gen; */ 995 return (0); 996 } 997 998 int 999 msdosfs_vget(mp, ino, vpp) 1000 struct mount *mp; 1001 ino_t ino; 1002 struct vnode **vpp; 1003 { 1004 1005 return (EOPNOTSUPP); 1006 } 1007 1008 SYSCTL_SETUP(sysctl_vfs_msdosfs_setup, "sysctl vfs.msdosfs subtree setup") 1009 { 1010 1011 sysctl_createv(clog, 0, NULL, NULL, 1012 CTLFLAG_PERMANENT, 1013 CTLTYPE_NODE, "vfs", NULL, 1014 NULL, 0, NULL, 0, 1015 CTL_VFS, CTL_EOL); 1016 sysctl_createv(clog, 0, NULL, NULL, 1017 CTLFLAG_PERMANENT, 1018 CTLTYPE_NODE, "msdosfs", 1019 SYSCTL_DESCR("MS-DOS file system"), 1020 NULL, 0, NULL, 0, 1021 CTL_VFS, 4, CTL_EOL); 1022 /* 1023 * XXX the "4" above could be dynamic, thereby eliminating one 1024 * more instance of the "number to vfs" mapping problem, but 1025 * "4" is the order as taken from sys/mount.h 1026 */ 1027 } 1028