1 /* $NetBSD: msdosfs_vfsops.c,v 1.18 2004/05/25 14:54:56 hannken 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 1.18 2004/05/25 14:54:56 hannken 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 int msdosfs_mountroot __P((void)); 85 int msdosfs_mount __P((struct mount *, const char *, void *, 86 struct nameidata *, struct proc *)); 87 int msdosfs_start __P((struct mount *, int, struct proc *)); 88 int msdosfs_unmount __P((struct mount *, int, struct proc *)); 89 int msdosfs_root __P((struct mount *, struct vnode **)); 90 int msdosfs_quotactl __P((struct mount *, int, uid_t, void *, struct proc *)); 91 int msdosfs_statvfs __P((struct mount *, struct statvfs *, struct proc *)); 92 int msdosfs_sync __P((struct mount *, int, struct ucred *, struct proc *)); 93 int msdosfs_vget __P((struct mount *, ino_t, struct vnode **)); 94 int msdosfs_fhtovp __P((struct mount *, struct fid *, struct vnode **)); 95 int msdosfs_checkexp __P((struct mount *, struct mbuf *, int *, 96 struct ucred **)); 97 int msdosfs_vptofh __P((struct vnode *, struct fid *)); 98 99 int msdosfs_mountfs __P((struct vnode *, struct mount *, struct proc *, 100 struct msdosfs_args *)); 101 102 static int update_mp __P((struct mount *, struct msdosfs_args *)); 103 104 MALLOC_DEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOS FS mount structure"); 105 MALLOC_DEFINE(M_MSDOSFSFAT, "MSDOSFS fat", "MSDOS FS fat table"); 106 107 #define ROOTNAME "root_device" 108 109 extern const struct vnodeopv_desc msdosfs_vnodeop_opv_desc; 110 111 const struct vnodeopv_desc * const msdosfs_vnodeopv_descs[] = { 112 &msdosfs_vnodeop_opv_desc, 113 NULL, 114 }; 115 116 struct vfsops msdosfs_vfsops = { 117 MOUNT_MSDOS, 118 msdosfs_mount, 119 msdosfs_start, 120 msdosfs_unmount, 121 msdosfs_root, 122 msdosfs_quotactl, 123 msdosfs_statvfs, 124 msdosfs_sync, 125 msdosfs_vget, 126 msdosfs_fhtovp, 127 msdosfs_vptofh, 128 msdosfs_init, 129 msdosfs_reinit, 130 msdosfs_done, 131 NULL, 132 msdosfs_mountroot, 133 msdosfs_checkexp, 134 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 135 msdosfs_vnodeopv_descs, 136 }; 137 138 static int 139 update_mp(mp, argp) 140 struct mount *mp; 141 struct msdosfs_args *argp; 142 { 143 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 144 int error; 145 146 pmp->pm_gid = argp->gid; 147 pmp->pm_uid = argp->uid; 148 pmp->pm_mask = argp->mask & ALLPERMS; 149 pmp->pm_dirmask = argp->dirmask & ALLPERMS; 150 pmp->pm_gmtoff = argp->gmtoff; 151 pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT; 152 153 /* 154 * GEMDOS knows nothing (yet) about win95 155 */ 156 if (pmp->pm_flags & MSDOSFSMNT_GEMDOSFS) 157 pmp->pm_flags |= MSDOSFSMNT_NOWIN95; 158 159 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 160 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 161 else if (!(pmp->pm_flags & 162 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 163 struct vnode *rootvp; 164 165 /* 166 * Try to divine whether to support Win'95 long filenames 167 */ 168 if (FAT32(pmp)) 169 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 170 else { 171 if ((error = msdosfs_root(mp, &rootvp)) != 0) 172 return error; 173 pmp->pm_flags |= findwin95(VTODE(rootvp)) 174 ? MSDOSFSMNT_LONGNAME 175 : MSDOSFSMNT_SHORTNAME; 176 vput(rootvp); 177 } 178 } 179 return 0; 180 } 181 182 int 183 msdosfs_mountroot() 184 { 185 struct mount *mp; 186 struct proc *p = curproc; /* XXX */ 187 int error; 188 struct msdosfs_args args; 189 190 if (root_device->dv_class != DV_DISK) 191 return (ENODEV); 192 193 /* 194 * Get vnodes for swapdev and rootdev. 195 */ 196 if (bdevvp(rootdev, &rootvp)) 197 panic("msdosfs_mountroot: can't setup rootvp"); 198 199 if ((error = vfs_rootmountalloc(MOUNT_MSDOS, "root_device", &mp))) { 200 vrele(rootvp); 201 return (error); 202 } 203 204 args.flags = MSDOSFSMNT_VERSIONED; 205 args.uid = 0; 206 args.gid = 0; 207 args.mask = 0777; 208 args.version = MSDOSFSMNT_VERSION; 209 args.dirmask = 0777; 210 211 if ((error = msdosfs_mountfs(rootvp, mp, p, &args)) != 0) { 212 mp->mnt_op->vfs_refcount--; 213 vfs_unbusy(mp); 214 free(mp, M_MOUNT); 215 vrele(rootvp); 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 vfs_showexport(mp, &args.export, &pmp->pm_export); 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 (p->p_ucred->cr_uid != 0) { 312 devvp = pmp->pm_devvp; 313 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 314 error = VOP_ACCESS(devvp, VREAD | VWRITE, 315 p->p_ucred, p); 316 VOP_UNLOCK(devvp, 0); 317 if (error) 318 return (error); 319 } 320 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 321 } 322 if (args.fspec == 0) { 323 #ifdef __notyet__ /* doesn't work correctly with current mountd XXX */ 324 if (args.flags & MSDOSFSMNT_MNTOPT) { 325 pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT; 326 pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT; 327 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 328 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 329 } 330 #endif 331 /* 332 * Process export requests. 333 */ 334 return (vfs_export(mp, &pmp->pm_export, &args.export)); 335 } 336 } 337 /* 338 * Not an update, or updating the name: look up the name 339 * and verify that it refers to a sensible block device. 340 */ 341 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p); 342 if ((error = namei(ndp)) != 0) 343 return (error); 344 devvp = ndp->ni_vp; 345 346 if (devvp->v_type != VBLK) { 347 vrele(devvp); 348 return (ENOTBLK); 349 } 350 if (bdevsw_lookup(devvp->v_rdev) == NULL) { 351 vrele(devvp); 352 return (ENXIO); 353 } 354 /* 355 * If mount by non-root, then verify that user has necessary 356 * permissions on the device. 357 */ 358 if (p->p_ucred->cr_uid != 0) { 359 accessmode = VREAD; 360 if ((mp->mnt_flag & MNT_RDONLY) == 0) 361 accessmode |= VWRITE; 362 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 363 error = VOP_ACCESS(devvp, accessmode, p->p_ucred, p); 364 VOP_UNLOCK(devvp, 0); 365 if (error) { 366 vrele(devvp); 367 return (error); 368 } 369 } 370 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 371 error = msdosfs_mountfs(devvp, mp, p, &args); 372 #ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 373 pmp = VFSTOMSDOSFS(mp); 374 #endif 375 } else { 376 if (devvp != pmp->pm_devvp) 377 error = EINVAL; /* needs translation */ 378 else 379 vrele(devvp); 380 } 381 if (error) { 382 vrele(devvp); 383 return (error); 384 } 385 386 if ((error = update_mp(mp, &args)) != 0) { 387 msdosfs_unmount(mp, MNT_FORCE, p); 388 return error; 389 } 390 391 #ifdef MSDOSFS_DEBUG 392 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 393 #endif 394 return set_statvfs_info(path, UIO_USERSPACE, args.fspec, UIO_USERSPACE, 395 mp, p); 396 } 397 398 int 399 msdosfs_mountfs(devvp, mp, p, argp) 400 struct vnode *devvp; 401 struct mount *mp; 402 struct proc *p; 403 struct msdosfs_args *argp; 404 { 405 struct msdosfsmount *pmp; 406 struct buf *bp; 407 dev_t dev = devvp->v_rdev; 408 struct partinfo dpart; 409 union bootsector *bsp; 410 struct byte_bpb33 *b33; 411 struct byte_bpb50 *b50; 412 struct byte_bpb710 *b710; 413 u_int8_t SecPerClust; 414 int ronly, error; 415 int bsize = 0, dtype = 0, tmp; 416 u_long dirsperblk; 417 418 /* 419 * Disallow multiple mounts of the same device. 420 * Disallow mounting of a device that is currently in use 421 * (except for root, which might share swap device for miniroot). 422 * Flush out any old buffers remaining from a previous use. 423 */ 424 if ((error = vfs_mountedon(devvp)) != 0) 425 return (error); 426 if (vcount(devvp) > 1 && devvp != rootvp) 427 return (EBUSY); 428 if ((error = vinvalbuf(devvp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) 429 return (error); 430 431 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 432 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p); 433 if (error) 434 return (error); 435 436 bp = NULL; /* both used in error_exit */ 437 pmp = NULL; 438 439 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 440 /* 441 * We need the disklabel to calculate the size of a FAT entry 442 * later on. Also make sure the partition contains a filesystem 443 * of type FS_MSDOS. This doesn't work for floppies, so we have 444 * to check for them too. 445 * 446 * At least some parts of the msdos fs driver seem to assume 447 * that the size of a disk block will always be 512 bytes. 448 * Let's check it... 449 */ 450 error = VOP_IOCTL(devvp, DIOCGPART, &dpart, FREAD, NOCRED, p); 451 if (error) 452 goto error_exit; 453 tmp = dpart.part->p_fstype; 454 dtype = dpart.disklab->d_type; 455 bsize = dpart.disklab->d_secsize; 456 if (bsize != 512 || (dtype!=DTYPE_FLOPPY && tmp!=FS_MSDOS)) { 457 error = EINVAL; 458 goto error_exit; 459 } 460 } 461 462 /* 463 * Read the boot sector of the filesystem, and then check the 464 * boot signature. If not a dos boot sector then error out. 465 */ 466 if ((error = bread(devvp, 0, 512, NOCRED, &bp)) != 0) 467 goto error_exit; 468 bp->b_flags |= B_AGE; 469 bsp = (union bootsector *)bp->b_data; 470 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 471 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 472 b710 = (struct byte_bpb710 *)bsp->bs710.bsBPB; 473 474 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 475 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 476 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 477 error = EINVAL; 478 goto error_exit; 479 } 480 } 481 482 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK); 483 memset(pmp, 0, sizeof *pmp); 484 pmp->pm_mountp = mp; 485 486 /* 487 * Compute several useful quantities from the bpb in the 488 * bootsector. Copy in the dos 5 variant of the bpb then fix up 489 * the fields that are different between dos 5 and dos 3.3. 490 */ 491 SecPerClust = b50->bpbSecPerClust; 492 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 493 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 494 pmp->pm_FATs = b50->bpbFATs; 495 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 496 pmp->pm_Sectors = getushort(b50->bpbSectors); 497 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 498 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 499 pmp->pm_Heads = getushort(b50->bpbHeads); 500 pmp->pm_Media = b50->bpbMedia; 501 502 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 503 /* XXX - We should probably check more values here */ 504 if (!pmp->pm_BytesPerSec || !SecPerClust 505 || pmp->pm_Heads > 255 || pmp->pm_SecPerTrack > 63) { 506 error = EINVAL; 507 goto error_exit; 508 } 509 } 510 511 if (pmp->pm_Sectors == 0) { 512 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 513 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 514 } else { 515 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 516 pmp->pm_HugeSectors = pmp->pm_Sectors; 517 } 518 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 519 if (pmp->pm_HugeSectors > 0xffffffff / dirsperblk + 1) { 520 /* 521 * We cannot deal currently with this size of disk 522 * due to fileid limitations (see msdosfs_getattr and 523 * msdosfs_readdir) 524 */ 525 error = EINVAL; 526 goto error_exit; 527 } 528 529 if (pmp->pm_RootDirEnts == 0) { 530 if (bsp->bs710.bsBootSectSig2 != BOOTSIG2 531 || bsp->bs710.bsBootSectSig3 != BOOTSIG3 532 || pmp->pm_Sectors 533 || pmp->pm_FATsecs 534 || getushort(b710->bpbFSVers)) { 535 error = EINVAL; 536 goto error_exit; 537 } 538 pmp->pm_fatmask = FAT32_MASK; 539 pmp->pm_fatmult = 4; 540 pmp->pm_fatdiv = 1; 541 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 542 543 /* mirrorring is enabled if the FATMIRROR bit is not set */ 544 if ((getushort(b710->bpbExtFlags) & FATMIRROR) == 0) 545 pmp->pm_flags |= MSDOSFS_FATMIRROR; 546 else 547 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 548 } else 549 pmp->pm_flags |= MSDOSFS_FATMIRROR; 550 551 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 552 if (FAT32(pmp)) { 553 /* 554 * GEMDOS doesn't know fat32. 555 */ 556 error = EINVAL; 557 goto error_exit; 558 } 559 560 /* 561 * Check a few values (could do some more): 562 * - logical sector size: power of 2, >= block size 563 * - sectors per cluster: power of 2, >= 1 564 * - number of sectors: >= 1, <= size of partition 565 */ 566 if ( (SecPerClust == 0) 567 || (SecPerClust & (SecPerClust - 1)) 568 || (pmp->pm_BytesPerSec < bsize) 569 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 570 || (pmp->pm_HugeSectors == 0) 571 || (pmp->pm_HugeSectors * (pmp->pm_BytesPerSec / bsize) 572 > dpart.part->p_size) 573 ) { 574 error = EINVAL; 575 goto error_exit; 576 } 577 /* 578 * XXX - Many parts of the msdos fs driver seem to assume that 579 * the number of bytes per logical sector (BytesPerSec) will 580 * always be the same as the number of bytes per disk block 581 * Let's pretend it is. 582 */ 583 tmp = pmp->pm_BytesPerSec / bsize; 584 pmp->pm_BytesPerSec = bsize; 585 pmp->pm_HugeSectors *= tmp; 586 pmp->pm_HiddenSects *= tmp; 587 pmp->pm_ResSectors *= tmp; 588 pmp->pm_Sectors *= tmp; 589 pmp->pm_FATsecs *= tmp; 590 SecPerClust *= tmp; 591 } 592 pmp->pm_fatblk = pmp->pm_ResSectors; 593 if (FAT32(pmp)) { 594 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 595 pmp->pm_firstcluster = pmp->pm_fatblk 596 + (pmp->pm_FATs * pmp->pm_FATsecs); 597 pmp->pm_fsinfo = getushort(b710->bpbFSInfo); 598 } else { 599 pmp->pm_rootdirblk = pmp->pm_fatblk + 600 (pmp->pm_FATs * pmp->pm_FATsecs); 601 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 602 + pmp->pm_BytesPerSec - 1) 603 / pmp->pm_BytesPerSec;/* in sectors */ 604 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 605 } 606 607 pmp->pm_nmbrofclusters = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 608 SecPerClust; 609 pmp->pm_maxcluster = pmp->pm_nmbrofclusters + 1; 610 pmp->pm_fatsize = pmp->pm_FATsecs * pmp->pm_BytesPerSec; 611 612 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 613 if (pmp->pm_nmbrofclusters <= (0xff0 - 2) 614 && (dtype == DTYPE_FLOPPY 615 || (dtype == DTYPE_VND 616 && (pmp->pm_Heads == 1 || pmp->pm_Heads == 2))) 617 ) { 618 pmp->pm_fatmask = FAT12_MASK; 619 pmp->pm_fatmult = 3; 620 pmp->pm_fatdiv = 2; 621 } else { 622 pmp->pm_fatmask = FAT16_MASK; 623 pmp->pm_fatmult = 2; 624 pmp->pm_fatdiv = 1; 625 } 626 } else if (pmp->pm_fatmask == 0) { 627 if (pmp->pm_maxcluster 628 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 629 /* 630 * This will usually be a floppy disk. This size makes 631 * sure that one fat entry will not be split across 632 * multiple blocks. 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 } 643 if (FAT12(pmp)) 644 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 645 else 646 pmp->pm_fatblocksize = MAXBSIZE; 647 648 pmp->pm_fatblocksec = pmp->pm_fatblocksize / pmp->pm_BytesPerSec; 649 pmp->pm_bnshift = ffs(pmp->pm_BytesPerSec) - 1; 650 651 /* 652 * Compute mask and shift value for isolating cluster relative byte 653 * offsets and cluster numbers from a file offset. 654 */ 655 pmp->pm_bpcluster = SecPerClust * pmp->pm_BytesPerSec; 656 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 657 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 658 659 /* 660 * Check for valid cluster size 661 * must be a power of 2 662 */ 663 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 664 error = EINVAL; 665 goto error_exit; 666 } 667 668 /* 669 * Release the bootsector buffer. 670 */ 671 brelse(bp); 672 bp = NULL; 673 674 /* 675 * Check FSInfo. 676 */ 677 if (pmp->pm_fsinfo) { 678 struct fsinfo *fp; 679 680 if ((error = bread(devvp, pmp->pm_fsinfo, 1024, NOCRED, &bp)) != 0) 681 goto error_exit; 682 fp = (struct fsinfo *)bp->b_data; 683 if (!memcmp(fp->fsisig1, "RRaA", 4) 684 && !memcmp(fp->fsisig2, "rrAa", 4) 685 && !memcmp(fp->fsisig3, "\0\0\125\252", 4) 686 && !memcmp(fp->fsisig4, "\0\0\125\252", 4)) 687 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 688 else 689 pmp->pm_fsinfo = 0; 690 brelse(bp); 691 bp = NULL; 692 } 693 694 /* 695 * Check and validate (or perhaps invalidate?) the fsinfo structure? 696 * XXX 697 */ 698 if (pmp->pm_fsinfo) { 699 if (pmp->pm_nxtfree == (u_long)-1) 700 pmp->pm_fsinfo = 0; 701 } 702 703 /* 704 * Allocate memory for the bitmap of allocated clusters, and then 705 * fill it in. 706 */ 707 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 708 / N_INUSEBITS) 709 * sizeof(*pmp->pm_inusemap), 710 M_MSDOSFSFAT, M_WAITOK); 711 712 /* 713 * fillinusemap() needs pm_devvp. 714 */ 715 pmp->pm_dev = dev; 716 pmp->pm_devvp = devvp; 717 718 /* 719 * Have the inuse map filled in. 720 */ 721 if ((error = fillinusemap(pmp)) != 0) 722 goto error_exit; 723 724 /* 725 * If they want fat updates to be synchronous then let them suffer 726 * the performance degradation in exchange for the on disk copy of 727 * the fat being correct just about all the time. I suppose this 728 * would be a good thing to turn on if the kernel is still flakey. 729 */ 730 if (mp->mnt_flag & MNT_SYNCHRONOUS) 731 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 732 733 /* 734 * Finish up. 735 */ 736 if (ronly) 737 pmp->pm_flags |= MSDOSFSMNT_RONLY; 738 else 739 pmp->pm_fmod = 1; 740 mp->mnt_data = pmp; 741 mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev; 742 mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_MSDOS); 743 mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; 744 mp->mnt_flag |= MNT_LOCAL; 745 mp->mnt_dev_bshift = pmp->pm_bnshift; 746 mp->mnt_fs_bshift = pmp->pm_cnshift; 747 748 #ifdef QUOTA 749 /* 750 * If we ever do quotas for DOS filesystems this would be a place 751 * to fill in the info in the msdosfsmount structure. You dolt, 752 * quotas on dos filesystems make no sense because files have no 753 * owners on dos filesystems. of course there is some empty space 754 * in the directory entry where we could put uid's and gid's. 755 */ 756 #endif 757 devvp->v_specmountpoint = mp; 758 759 return (0); 760 761 error_exit:; 762 if (bp) 763 brelse(bp); 764 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 765 (void) VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, p); 766 VOP_UNLOCK(devvp, 0); 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(mp, flags, p) 778 struct mount *mp; 779 int flags; 780 struct proc *p; 781 { 782 783 return (0); 784 } 785 786 /* 787 * Unmount the filesystem described by mp. 788 */ 789 int 790 msdosfs_unmount(mp, mntflags, p) 791 struct mount *mp; 792 int mntflags; 793 struct proc *p; 794 { 795 struct msdosfsmount *pmp; 796 int error, flags; 797 798 flags = 0; 799 if (mntflags & MNT_FORCE) 800 flags |= FORCECLOSE; 801 #ifdef QUOTA 802 #endif 803 if ((error = vflush(mp, NULLVP, flags)) != 0) 804 return (error); 805 pmp = VFSTOMSDOSFS(mp); 806 if (pmp->pm_devvp->v_type != VBAD) 807 pmp->pm_devvp->v_specmountpoint = NULL; 808 #ifdef MSDOSFS_DEBUG 809 { 810 struct vnode *vp = pmp->pm_devvp; 811 812 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 813 printf("flag %08x, usecount %d, writecount %ld, holdcnt %ld\n", 814 vp->v_flag, vp->v_usecount, vp->v_writecount, vp->v_holdcnt); 815 printf("id %lu, mount %p, op %p\n", 816 vp->v_id, vp->v_mount, vp->v_op); 817 printf("freef %p, freeb %p, mount %p\n", 818 vp->v_freelist.tqe_next, vp->v_freelist.tqe_prev, 819 vp->v_mount); 820 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %d, type %d\n", 821 vp->v_cleanblkhd.lh_first, 822 vp->v_dirtyblkhd.lh_first, 823 vp->v_numoutput, vp->v_type); 824 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 825 vp->v_socket, vp->v_tag, 826 ((u_int *)vp->v_data)[0], 827 ((u_int *)vp->v_data)[1]); 828 } 829 #endif 830 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY); 831 error = VOP_CLOSE(pmp->pm_devvp, 832 pmp->pm_flags & MSDOSFSMNT_RONLY ? FREAD : FREAD|FWRITE, NOCRED, p); 833 vput(pmp->pm_devvp); 834 free(pmp->pm_inusemap, M_MSDOSFSFAT); 835 free(pmp, M_MSDOSFSMNT); 836 mp->mnt_data = NULL; 837 mp->mnt_flag &= ~MNT_LOCAL; 838 return (error); 839 } 840 841 int 842 msdosfs_root(mp, vpp) 843 struct mount *mp; 844 struct vnode **vpp; 845 { 846 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 847 struct denode *ndep; 848 int error; 849 850 #ifdef MSDOSFS_DEBUG 851 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 852 #endif 853 if ((error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep)) != 0) 854 return (error); 855 *vpp = DETOV(ndep); 856 return (0); 857 } 858 859 int 860 msdosfs_quotactl(mp, cmds, uid, arg, p) 861 struct mount *mp; 862 int cmds; 863 uid_t uid; 864 void *arg; 865 struct proc *p; 866 { 867 868 #ifdef QUOTA 869 return (EOPNOTSUPP); 870 #else 871 return (EOPNOTSUPP); 872 #endif 873 } 874 875 int 876 msdosfs_statvfs(mp, sbp, p) 877 struct mount *mp; 878 struct statvfs *sbp; 879 struct proc *p; 880 { 881 struct msdosfsmount *pmp; 882 883 pmp = VFSTOMSDOSFS(mp); 884 sbp->f_bsize = pmp->pm_bpcluster; 885 sbp->f_frsize = sbp->f_bsize; 886 sbp->f_iosize = pmp->pm_bpcluster; 887 sbp->f_blocks = pmp->pm_nmbrofclusters; 888 sbp->f_bfree = pmp->pm_freeclustercount; 889 sbp->f_bavail = pmp->pm_freeclustercount; 890 sbp->f_bresvd = 0; 891 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 892 sbp->f_ffree = 0; /* what to put in here? */ 893 sbp->f_favail = 0; /* what to put in here? */ 894 sbp->f_fresvd = 0; 895 copy_statvfs_info(sbp, mp); 896 return (0); 897 } 898 899 int 900 msdosfs_sync(mp, waitfor, cred, p) 901 struct mount *mp; 902 int waitfor; 903 struct ucred *cred; 904 struct proc *p; 905 { 906 struct vnode *vp, *nvp; 907 struct denode *dep; 908 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 909 int error, allerror = 0; 910 911 /* 912 * If we ever switch to not updating all of the fats all the time, 913 * this would be the place to update them from the first one. 914 */ 915 if (pmp->pm_fmod != 0) { 916 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 917 panic("msdosfs_sync: rofs mod"); 918 else { 919 /* update fats here */ 920 } 921 } 922 /* 923 * Write back each (modified) denode. 924 */ 925 simple_lock(&mntvnode_slock); 926 loop: 927 for (vp = mp->mnt_vnodelist.lh_first; vp != NULL; vp = nvp) { 928 /* 929 * If the vnode that we are about to sync is no longer 930 * assoicated with this mount point, start over. 931 */ 932 if (vp->v_mount != mp) 933 goto loop; 934 simple_lock(&vp->v_interlock); 935 nvp = vp->v_mntvnodes.le_next; 936 dep = VTODE(vp); 937 if (waitfor == MNT_LAZY || vp->v_type == VNON || 938 (((dep->de_flag & 939 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0) && 940 (LIST_EMPTY(&vp->v_dirtyblkhd) && 941 vp->v_uobj.uo_npages == 0))) { 942 simple_unlock(&vp->v_interlock); 943 continue; 944 } 945 simple_unlock(&mntvnode_slock); 946 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK); 947 if (error) { 948 simple_lock(&mntvnode_slock); 949 if (error == ENOENT) 950 goto loop; 951 continue; 952 } 953 if ((error = VOP_FSYNC(vp, cred, 954 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0, p)) != 0) 955 allerror = error; 956 vput(vp); 957 simple_lock(&mntvnode_slock); 958 } 959 simple_unlock(&mntvnode_slock); 960 /* 961 * Force stale file system control information to be flushed. 962 */ 963 if ((error = VOP_FSYNC(pmp->pm_devvp, cred, 964 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0, p)) != 0) 965 allerror = error; 966 #ifdef QUOTA 967 /* qsync(mp); */ 968 #endif 969 return (allerror); 970 } 971 972 int 973 msdosfs_fhtovp(mp, fhp, vpp) 974 struct mount *mp; 975 struct fid *fhp; 976 struct vnode **vpp; 977 { 978 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 979 struct defid *defhp = (struct defid *) fhp; 980 struct denode *dep; 981 int error; 982 983 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 984 if (error) { 985 *vpp = NULLVP; 986 return (error); 987 } 988 *vpp = DETOV(dep); 989 return (0); 990 } 991 992 int 993 msdosfs_checkexp(mp, nam, exflagsp, credanonp) 994 struct mount *mp; 995 struct mbuf *nam; 996 int *exflagsp; 997 struct ucred **credanonp; 998 { 999 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 1000 struct netcred *np; 1001 1002 np = vfs_export_lookup(mp, &pmp->pm_export, nam); 1003 if (np == NULL) 1004 return (EACCES); 1005 *exflagsp = np->netc_exflags; 1006 *credanonp = &np->netc_anon; 1007 return (0); 1008 } 1009 1010 int 1011 msdosfs_vptofh(vp, fhp) 1012 struct vnode *vp; 1013 struct fid *fhp; 1014 { 1015 struct denode *dep; 1016 struct defid *defhp; 1017 1018 dep = VTODE(vp); 1019 defhp = (struct defid *)fhp; 1020 defhp->defid_len = sizeof(struct defid); 1021 defhp->defid_dirclust = dep->de_dirclust; 1022 defhp->defid_dirofs = dep->de_diroffset; 1023 /* defhp->defid_gen = dep->de_gen; */ 1024 return (0); 1025 } 1026 1027 int 1028 msdosfs_vget(mp, ino, vpp) 1029 struct mount *mp; 1030 ino_t ino; 1031 struct vnode **vpp; 1032 { 1033 1034 return (EOPNOTSUPP); 1035 } 1036 1037 SYSCTL_SETUP(sysctl_vfs_msdosfs_setup, "sysctl vfs.msdosfs subtree setup") 1038 { 1039 1040 sysctl_createv(clog, 0, NULL, NULL, 1041 CTLFLAG_PERMANENT, 1042 CTLTYPE_NODE, "vfs", NULL, 1043 NULL, 0, NULL, 0, 1044 CTL_VFS, CTL_EOL); 1045 sysctl_createv(clog, 0, NULL, NULL, 1046 CTLFLAG_PERMANENT, 1047 CTLTYPE_NODE, "msdosfs", 1048 SYSCTL_DESCR("MS-DOS file system"), 1049 NULL, 0, NULL, 0, 1050 CTL_VFS, 4, CTL_EOL); 1051 /* 1052 * XXX the "4" above could be dynamic, thereby eliminating one 1053 * more instance of the "number to vfs" mapping problem, but 1054 * "4" is the order as taken from sys/mount.h 1055 */ 1056 } 1057