1 /* $NetBSD: msdosfs_vfsops.c,v 1.12 2003/12/04 19:38:23 atatat 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 1.12 2003/12/04 19:38:23 atatat 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, caddr_t, struct proc *)); 91 int msdosfs_statfs __P((struct mount *, struct statfs *, 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_statfs, 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 msdosfs_vnodeopv_descs, 135 }; 136 137 static int 138 update_mp(mp, argp) 139 struct mount *mp; 140 struct msdosfs_args *argp; 141 { 142 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 143 int error; 144 145 pmp->pm_gid = argp->gid; 146 pmp->pm_uid = argp->uid; 147 pmp->pm_mask = argp->mask & ALLPERMS; 148 pmp->pm_dirmask = argp->dirmask & ALLPERMS; 149 pmp->pm_gmtoff = argp->gmtoff; 150 pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT; 151 152 /* 153 * GEMDOS knows nothing (yet) about win95 154 */ 155 if (pmp->pm_flags & MSDOSFSMNT_GEMDOSFS) 156 pmp->pm_flags |= MSDOSFSMNT_NOWIN95; 157 158 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 159 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 160 else if (!(pmp->pm_flags & 161 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 162 struct vnode *rootvp; 163 164 /* 165 * Try to divine whether to support Win'95 long filenames 166 */ 167 if (FAT32(pmp)) 168 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 169 else { 170 if ((error = msdosfs_root(mp, &rootvp)) != 0) 171 return error; 172 pmp->pm_flags |= findwin95(VTODE(rootvp)) 173 ? MSDOSFSMNT_LONGNAME 174 : MSDOSFSMNT_SHORTNAME; 175 vput(rootvp); 176 } 177 } 178 return 0; 179 } 180 181 int 182 msdosfs_mountroot() 183 { 184 struct mount *mp; 185 struct proc *p = curproc; /* XXX */ 186 int error; 187 struct msdosfs_args args; 188 189 if (root_device->dv_class != DV_DISK) 190 return (ENODEV); 191 192 /* 193 * Get vnodes for swapdev and rootdev. 194 */ 195 if (bdevvp(rootdev, &rootvp)) 196 panic("msdosfs_mountroot: can't setup rootvp"); 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, p, &args)) != 0) { 211 mp->mnt_op->vfs_refcount--; 212 vfs_unbusy(mp); 213 free(mp, M_MOUNT); 214 vrele(rootvp); 215 return (error); 216 } 217 218 if ((error = update_mp(mp, &args)) != 0) { 219 (void)msdosfs_unmount(mp, 0, p); 220 vfs_unbusy(mp); 221 free(mp, M_MOUNT); 222 vrele(rootvp); 223 return (error); 224 } 225 226 simple_lock(&mountlist_slock); 227 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 228 simple_unlock(&mountlist_slock); 229 (void)msdosfs_statfs(mp, &mp->mnt_stat, p); 230 vfs_unbusy(mp); 231 return (0); 232 } 233 234 /* 235 * mp - path - addr in user space of mount point (ie /usr or whatever) 236 * data - addr in user space of mount params including the name of the block 237 * special file to treat as a filesystem. 238 */ 239 int 240 msdosfs_mount(mp, path, data, ndp, p) 241 struct mount *mp; 242 const char *path; 243 void *data; 244 struct nameidata *ndp; 245 struct proc *p; 246 { 247 struct vnode *devvp; /* vnode for blk device to mount */ 248 struct msdosfs_args args; /* will hold data from mount request */ 249 /* msdosfs specific mount control block */ 250 struct msdosfsmount *pmp = NULL; 251 int error, flags; 252 mode_t accessmode; 253 254 if (mp->mnt_flag & MNT_GETARGS) { 255 pmp = VFSTOMSDOSFS(mp); 256 if (pmp == NULL) 257 return EIO; 258 args.fspec = NULL; 259 args.uid = pmp->pm_uid; 260 args.gid = pmp->pm_gid; 261 args.mask = pmp->pm_mask; 262 args.flags = pmp->pm_flags; 263 args.version = MSDOSFSMNT_VERSION; 264 args.dirmask = pmp->pm_dirmask; 265 vfs_showexport(mp, &args.export, &pmp->pm_export); 266 return copyout(&args, data, sizeof(args)); 267 } 268 error = copyin(data, &args, sizeof(struct msdosfs_args)); 269 if (error) 270 return (error); 271 272 /* 273 * If not versioned (i.e. using old mount_msdos(8)), fill in 274 * the additional structure items with suitable defaults. 275 */ 276 if ((args.flags & MSDOSFSMNT_VERSIONED) == 0) { 277 args.version = 1; 278 args.dirmask = args.mask; 279 } 280 281 /* 282 * If updating, check whether changing from read-only to 283 * read/write; if there is no device name, that's all we do. 284 */ 285 if (mp->mnt_flag & MNT_UPDATE) { 286 pmp = VFSTOMSDOSFS(mp); 287 error = 0; 288 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_RDONLY)) { 289 flags = WRITECLOSE; 290 if (mp->mnt_flag & MNT_FORCE) 291 flags |= FORCECLOSE; 292 error = vflush(mp, NULLVP, flags); 293 } 294 if (!error && (mp->mnt_flag & MNT_RELOAD)) 295 /* not yet implemented */ 296 error = EOPNOTSUPP; 297 if (error) 298 return (error); 299 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_iflag & IMNT_WANTRDWR)) { 300 /* 301 * If upgrade to read-write by non-root, then verify 302 * that user has necessary permissions on the device. 303 */ 304 if (p->p_ucred->cr_uid != 0) { 305 devvp = pmp->pm_devvp; 306 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 307 error = VOP_ACCESS(devvp, VREAD | VWRITE, 308 p->p_ucred, p); 309 VOP_UNLOCK(devvp, 0); 310 if (error) 311 return (error); 312 } 313 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 314 } 315 if (args.fspec == 0) { 316 #ifdef __notyet__ /* doesn't work correctly with current mountd XXX */ 317 if (args.flags & MSDOSFSMNT_MNTOPT) { 318 pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT; 319 pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT; 320 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 321 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 322 } 323 #endif 324 /* 325 * Process export requests. 326 */ 327 return (vfs_export(mp, &pmp->pm_export, &args.export)); 328 } 329 } 330 /* 331 * Not an update, or updating the name: look up the name 332 * and verify that it refers to a sensible block device. 333 */ 334 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p); 335 if ((error = namei(ndp)) != 0) 336 return (error); 337 devvp = ndp->ni_vp; 338 339 if (devvp->v_type != VBLK) { 340 vrele(devvp); 341 return (ENOTBLK); 342 } 343 if (bdevsw_lookup(devvp->v_rdev) == NULL) { 344 vrele(devvp); 345 return (ENXIO); 346 } 347 /* 348 * If mount by non-root, then verify that user has necessary 349 * permissions on the device. 350 */ 351 if (p->p_ucred->cr_uid != 0) { 352 accessmode = VREAD; 353 if ((mp->mnt_flag & MNT_RDONLY) == 0) 354 accessmode |= VWRITE; 355 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 356 error = VOP_ACCESS(devvp, accessmode, p->p_ucred, p); 357 VOP_UNLOCK(devvp, 0); 358 if (error) { 359 vrele(devvp); 360 return (error); 361 } 362 } 363 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 364 error = msdosfs_mountfs(devvp, mp, p, &args); 365 #ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 366 pmp = VFSTOMSDOSFS(mp); 367 #endif 368 } else { 369 if (devvp != pmp->pm_devvp) 370 error = EINVAL; /* needs translation */ 371 else 372 vrele(devvp); 373 } 374 if (error) { 375 vrele(devvp); 376 return (error); 377 } 378 379 if ((error = update_mp(mp, &args)) != 0) { 380 msdosfs_unmount(mp, MNT_FORCE, p); 381 return error; 382 } 383 384 #ifdef MSDOSFS_DEBUG 385 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 386 #endif 387 return set_statfs_info(path, UIO_USERSPACE, args.fspec, UIO_USERSPACE, 388 mp, p); 389 } 390 391 int 392 msdosfs_mountfs(devvp, mp, p, argp) 393 struct vnode *devvp; 394 struct mount *mp; 395 struct proc *p; 396 struct msdosfs_args *argp; 397 { 398 struct msdosfsmount *pmp; 399 struct buf *bp; 400 dev_t dev = devvp->v_rdev; 401 struct partinfo dpart; 402 union bootsector *bsp; 403 struct byte_bpb33 *b33; 404 struct byte_bpb50 *b50; 405 struct byte_bpb710 *b710; 406 u_int8_t SecPerClust; 407 int ronly, error; 408 int bsize = 0, dtype = 0, tmp; 409 u_long dirsperblk; 410 411 /* 412 * Disallow multiple mounts of the same device. 413 * Disallow mounting of a device that is currently in use 414 * (except for root, which might share swap device for miniroot). 415 * Flush out any old buffers remaining from a previous use. 416 */ 417 if ((error = vfs_mountedon(devvp)) != 0) 418 return (error); 419 if (vcount(devvp) > 1 && devvp != rootvp) 420 return (EBUSY); 421 if ((error = vinvalbuf(devvp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) 422 return (error); 423 424 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 425 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p); 426 if (error) 427 return (error); 428 429 bp = NULL; /* both used in error_exit */ 430 pmp = NULL; 431 432 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 433 /* 434 * We need the disklabel to calculate the size of a FAT entry 435 * later on. Also make sure the partition contains a filesystem 436 * of type FS_MSDOS. This doesn't work for floppies, so we have 437 * to check for them too. 438 * 439 * At least some parts of the msdos fs driver seem to assume 440 * that the size of a disk block will always be 512 bytes. 441 * Let's check it... 442 */ 443 error = VOP_IOCTL(devvp, DIOCGPART, &dpart, FREAD, NOCRED, p); 444 if (error) 445 goto error_exit; 446 tmp = dpart.part->p_fstype; 447 dtype = dpart.disklab->d_type; 448 bsize = dpart.disklab->d_secsize; 449 if (bsize != 512 || (dtype!=DTYPE_FLOPPY && tmp!=FS_MSDOS)) { 450 error = EINVAL; 451 goto error_exit; 452 } 453 } 454 455 /* 456 * Read the boot sector of the filesystem, and then check the 457 * boot signature. If not a dos boot sector then error out. 458 */ 459 if ((error = bread(devvp, 0, 512, NOCRED, &bp)) != 0) 460 goto error_exit; 461 bp->b_flags |= B_AGE; 462 bsp = (union bootsector *)bp->b_data; 463 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 464 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 465 b710 = (struct byte_bpb710 *)bsp->bs710.bsBPB; 466 467 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 468 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 469 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 470 error = EINVAL; 471 goto error_exit; 472 } 473 } 474 475 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK); 476 memset(pmp, 0, sizeof *pmp); 477 pmp->pm_mountp = mp; 478 479 /* 480 * Compute several useful quantities from the bpb in the 481 * bootsector. Copy in the dos 5 variant of the bpb then fix up 482 * the fields that are different between dos 5 and dos 3.3. 483 */ 484 SecPerClust = b50->bpbSecPerClust; 485 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 486 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 487 pmp->pm_FATs = b50->bpbFATs; 488 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 489 pmp->pm_Sectors = getushort(b50->bpbSectors); 490 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 491 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 492 pmp->pm_Heads = getushort(b50->bpbHeads); 493 pmp->pm_Media = b50->bpbMedia; 494 495 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 496 /* XXX - We should probably check more values here */ 497 if (!pmp->pm_BytesPerSec || !SecPerClust 498 || pmp->pm_Heads > 255 || pmp->pm_SecPerTrack > 63) { 499 error = EINVAL; 500 goto error_exit; 501 } 502 } 503 504 if (pmp->pm_Sectors == 0) { 505 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 506 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 507 } else { 508 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 509 pmp->pm_HugeSectors = pmp->pm_Sectors; 510 } 511 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 512 if (pmp->pm_HugeSectors > 0xffffffff / dirsperblk + 1) { 513 /* 514 * We cannot deal currently with this size of disk 515 * due to fileid limitations (see msdosfs_getattr and 516 * msdosfs_readdir) 517 */ 518 error = EINVAL; 519 goto error_exit; 520 } 521 522 if (pmp->pm_RootDirEnts == 0) { 523 if (bsp->bs710.bsBootSectSig2 != BOOTSIG2 524 || bsp->bs710.bsBootSectSig3 != BOOTSIG3 525 || pmp->pm_Sectors 526 || pmp->pm_FATsecs 527 || getushort(b710->bpbFSVers)) { 528 error = EINVAL; 529 goto error_exit; 530 } 531 pmp->pm_fatmask = FAT32_MASK; 532 pmp->pm_fatmult = 4; 533 pmp->pm_fatdiv = 1; 534 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 535 536 /* mirrorring is enabled if the FATMIRROR bit is not set */ 537 if ((getushort(b710->bpbExtFlags) & FATMIRROR) == 0) 538 pmp->pm_flags |= MSDOSFS_FATMIRROR; 539 else 540 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 541 } else 542 pmp->pm_flags |= MSDOSFS_FATMIRROR; 543 544 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 545 if (FAT32(pmp)) { 546 /* 547 * GEMDOS doesn't know fat32. 548 */ 549 error = EINVAL; 550 goto error_exit; 551 } 552 553 /* 554 * Check a few values (could do some more): 555 * - logical sector size: power of 2, >= block size 556 * - sectors per cluster: power of 2, >= 1 557 * - number of sectors: >= 1, <= size of partition 558 */ 559 if ( (SecPerClust == 0) 560 || (SecPerClust & (SecPerClust - 1)) 561 || (pmp->pm_BytesPerSec < bsize) 562 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 563 || (pmp->pm_HugeSectors == 0) 564 || (pmp->pm_HugeSectors * (pmp->pm_BytesPerSec / bsize) 565 > dpart.part->p_size) 566 ) { 567 error = EINVAL; 568 goto error_exit; 569 } 570 /* 571 * XXX - Many parts of the msdos fs driver seem to assume that 572 * the number of bytes per logical sector (BytesPerSec) will 573 * always be the same as the number of bytes per disk block 574 * Let's pretend it is. 575 */ 576 tmp = pmp->pm_BytesPerSec / bsize; 577 pmp->pm_BytesPerSec = bsize; 578 pmp->pm_HugeSectors *= tmp; 579 pmp->pm_HiddenSects *= tmp; 580 pmp->pm_ResSectors *= tmp; 581 pmp->pm_Sectors *= tmp; 582 pmp->pm_FATsecs *= tmp; 583 SecPerClust *= tmp; 584 } 585 pmp->pm_fatblk = pmp->pm_ResSectors; 586 if (FAT32(pmp)) { 587 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 588 pmp->pm_firstcluster = pmp->pm_fatblk 589 + (pmp->pm_FATs * pmp->pm_FATsecs); 590 pmp->pm_fsinfo = getushort(b710->bpbFSInfo); 591 } else { 592 pmp->pm_rootdirblk = pmp->pm_fatblk + 593 (pmp->pm_FATs * pmp->pm_FATsecs); 594 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 595 + pmp->pm_BytesPerSec - 1) 596 / pmp->pm_BytesPerSec;/* in sectors */ 597 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 598 } 599 600 pmp->pm_nmbrofclusters = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 601 SecPerClust; 602 pmp->pm_maxcluster = pmp->pm_nmbrofclusters + 1; 603 pmp->pm_fatsize = pmp->pm_FATsecs * pmp->pm_BytesPerSec; 604 605 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 606 if (pmp->pm_nmbrofclusters <= (0xff0 - 2) 607 && (dtype == DTYPE_FLOPPY 608 || (dtype == DTYPE_VND 609 && (pmp->pm_Heads == 1 || pmp->pm_Heads == 2))) 610 ) { 611 pmp->pm_fatmask = FAT12_MASK; 612 pmp->pm_fatmult = 3; 613 pmp->pm_fatdiv = 2; 614 } else { 615 pmp->pm_fatmask = FAT16_MASK; 616 pmp->pm_fatmult = 2; 617 pmp->pm_fatdiv = 1; 618 } 619 } else if (pmp->pm_fatmask == 0) { 620 if (pmp->pm_maxcluster 621 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 622 /* 623 * This will usually be a floppy disk. This size makes 624 * sure that one fat entry will not be split across 625 * multiple blocks. 626 */ 627 pmp->pm_fatmask = FAT12_MASK; 628 pmp->pm_fatmult = 3; 629 pmp->pm_fatdiv = 2; 630 } else { 631 pmp->pm_fatmask = FAT16_MASK; 632 pmp->pm_fatmult = 2; 633 pmp->pm_fatdiv = 1; 634 } 635 } 636 if (FAT12(pmp)) 637 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 638 else 639 pmp->pm_fatblocksize = MAXBSIZE; 640 641 pmp->pm_fatblocksec = pmp->pm_fatblocksize / pmp->pm_BytesPerSec; 642 pmp->pm_bnshift = ffs(pmp->pm_BytesPerSec) - 1; 643 644 /* 645 * Compute mask and shift value for isolating cluster relative byte 646 * offsets and cluster numbers from a file offset. 647 */ 648 pmp->pm_bpcluster = SecPerClust * pmp->pm_BytesPerSec; 649 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 650 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 651 652 /* 653 * Check for valid cluster size 654 * must be a power of 2 655 */ 656 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 657 error = EINVAL; 658 goto error_exit; 659 } 660 661 /* 662 * Release the bootsector buffer. 663 */ 664 brelse(bp); 665 bp = NULL; 666 667 /* 668 * Check FSInfo. 669 */ 670 if (pmp->pm_fsinfo) { 671 struct fsinfo *fp; 672 673 if ((error = bread(devvp, pmp->pm_fsinfo, 1024, NOCRED, &bp)) != 0) 674 goto error_exit; 675 fp = (struct fsinfo *)bp->b_data; 676 if (!memcmp(fp->fsisig1, "RRaA", 4) 677 && !memcmp(fp->fsisig2, "rrAa", 4) 678 && !memcmp(fp->fsisig3, "\0\0\125\252", 4) 679 && !memcmp(fp->fsisig4, "\0\0\125\252", 4)) 680 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 681 else 682 pmp->pm_fsinfo = 0; 683 brelse(bp); 684 bp = NULL; 685 } 686 687 /* 688 * Check and validate (or perhaps invalidate?) the fsinfo structure? 689 * XXX 690 */ 691 if (pmp->pm_fsinfo) { 692 if (pmp->pm_nxtfree == (u_long)-1) 693 pmp->pm_fsinfo = 0; 694 } 695 696 /* 697 * Allocate memory for the bitmap of allocated clusters, and then 698 * fill it in. 699 */ 700 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 701 / N_INUSEBITS) 702 * sizeof(*pmp->pm_inusemap), 703 M_MSDOSFSFAT, M_WAITOK); 704 705 /* 706 * fillinusemap() needs pm_devvp. 707 */ 708 pmp->pm_dev = dev; 709 pmp->pm_devvp = devvp; 710 711 /* 712 * Have the inuse map filled in. 713 */ 714 if ((error = fillinusemap(pmp)) != 0) 715 goto error_exit; 716 717 /* 718 * If they want fat updates to be synchronous then let them suffer 719 * the performance degradation in exchange for the on disk copy of 720 * the fat being correct just about all the time. I suppose this 721 * would be a good thing to turn on if the kernel is still flakey. 722 */ 723 if (mp->mnt_flag & MNT_SYNCHRONOUS) 724 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 725 726 /* 727 * Finish up. 728 */ 729 if (ronly) 730 pmp->pm_flags |= MSDOSFSMNT_RONLY; 731 else 732 pmp->pm_fmod = 1; 733 mp->mnt_data = pmp; 734 mp->mnt_stat.f_fsid.val[0] = (long)dev; 735 mp->mnt_stat.f_fsid.val[1] = makefstype(MOUNT_MSDOS); 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 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 757 (void) VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, p); 758 VOP_UNLOCK(devvp, 0); 759 if (pmp) { 760 if (pmp->pm_inusemap) 761 free(pmp->pm_inusemap, M_MSDOSFSFAT); 762 free(pmp, M_MSDOSFSMNT); 763 mp->mnt_data = NULL; 764 } 765 return (error); 766 } 767 768 int 769 msdosfs_start(mp, flags, p) 770 struct mount *mp; 771 int flags; 772 struct proc *p; 773 { 774 775 return (0); 776 } 777 778 /* 779 * Unmount the filesystem described by mp. 780 */ 781 int 782 msdosfs_unmount(mp, mntflags, p) 783 struct mount *mp; 784 int mntflags; 785 struct proc *p; 786 { 787 struct msdosfsmount *pmp; 788 int error, flags; 789 790 flags = 0; 791 if (mntflags & MNT_FORCE) 792 flags |= FORCECLOSE; 793 #ifdef QUOTA 794 #endif 795 if ((error = vflush(mp, NULLVP, flags)) != 0) 796 return (error); 797 pmp = VFSTOMSDOSFS(mp); 798 if (pmp->pm_devvp->v_type != VBAD) 799 pmp->pm_devvp->v_specmountpoint = NULL; 800 #ifdef MSDOSFS_DEBUG 801 { 802 struct vnode *vp = pmp->pm_devvp; 803 804 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 805 printf("flag %08x, usecount %d, writecount %ld, holdcnt %ld\n", 806 vp->v_flag, vp->v_usecount, vp->v_writecount, vp->v_holdcnt); 807 printf("id %lu, mount %p, op %p\n", 808 vp->v_id, vp->v_mount, vp->v_op); 809 printf("freef %p, freeb %p, mount %p\n", 810 vp->v_freelist.tqe_next, vp->v_freelist.tqe_prev, 811 vp->v_mount); 812 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %d, type %d\n", 813 vp->v_cleanblkhd.lh_first, 814 vp->v_dirtyblkhd.lh_first, 815 vp->v_numoutput, vp->v_type); 816 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 817 vp->v_socket, vp->v_tag, 818 ((u_int *)vp->v_data)[0], 819 ((u_int *)vp->v_data)[1]); 820 } 821 #endif 822 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY); 823 error = VOP_CLOSE(pmp->pm_devvp, 824 pmp->pm_flags & MSDOSFSMNT_RONLY ? FREAD : FREAD|FWRITE, NOCRED, p); 825 vput(pmp->pm_devvp); 826 free(pmp->pm_inusemap, M_MSDOSFSFAT); 827 free(pmp, M_MSDOSFSMNT); 828 mp->mnt_data = NULL; 829 mp->mnt_flag &= ~MNT_LOCAL; 830 return (error); 831 } 832 833 int 834 msdosfs_root(mp, vpp) 835 struct mount *mp; 836 struct vnode **vpp; 837 { 838 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 839 struct denode *ndep; 840 int error; 841 842 #ifdef MSDOSFS_DEBUG 843 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 844 #endif 845 if ((error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep)) != 0) 846 return (error); 847 *vpp = DETOV(ndep); 848 return (0); 849 } 850 851 int 852 msdosfs_quotactl(mp, cmds, uid, arg, p) 853 struct mount *mp; 854 int cmds; 855 uid_t uid; 856 caddr_t arg; 857 struct proc *p; 858 { 859 860 #ifdef QUOTA 861 return (EOPNOTSUPP); 862 #else 863 return (EOPNOTSUPP); 864 #endif 865 } 866 867 int 868 msdosfs_statfs(mp, sbp, p) 869 struct mount *mp; 870 struct statfs *sbp; 871 struct proc *p; 872 { 873 struct msdosfsmount *pmp; 874 875 pmp = VFSTOMSDOSFS(mp); 876 #ifdef COMPAT_09 877 sbp->f_type = 4; 878 #else 879 sbp->f_type = 0; 880 #endif 881 sbp->f_bsize = pmp->pm_bpcluster; 882 sbp->f_iosize = pmp->pm_bpcluster; 883 sbp->f_blocks = pmp->pm_nmbrofclusters; 884 sbp->f_bfree = pmp->pm_freeclustercount; 885 sbp->f_bavail = pmp->pm_freeclustercount; 886 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 887 sbp->f_ffree = 0; /* what to put in here? */ 888 copy_statfs_info(sbp, mp); 889 return (0); 890 } 891 892 int 893 msdosfs_sync(mp, waitfor, cred, p) 894 struct mount *mp; 895 int waitfor; 896 struct ucred *cred; 897 struct proc *p; 898 { 899 struct vnode *vp, *nvp; 900 struct denode *dep; 901 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 902 int error, allerror = 0; 903 904 /* 905 * If we ever switch to not updating all of the fats all the time, 906 * this would be the place to update them from the first one. 907 */ 908 if (pmp->pm_fmod != 0) { 909 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 910 panic("msdosfs_sync: rofs mod"); 911 else { 912 /* update fats here */ 913 } 914 } 915 /* 916 * Write back each (modified) denode. 917 */ 918 simple_lock(&mntvnode_slock); 919 loop: 920 for (vp = mp->mnt_vnodelist.lh_first; vp != NULL; vp = nvp) { 921 /* 922 * If the vnode that we are about to sync is no longer 923 * assoicated with this mount point, start over. 924 */ 925 if (vp->v_mount != mp) 926 goto loop; 927 simple_lock(&vp->v_interlock); 928 nvp = vp->v_mntvnodes.le_next; 929 dep = VTODE(vp); 930 if (waitfor == MNT_LAZY || vp->v_type == VNON || 931 (((dep->de_flag & 932 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0) && 933 (LIST_EMPTY(&vp->v_dirtyblkhd) && 934 vp->v_uobj.uo_npages == 0))) { 935 simple_unlock(&vp->v_interlock); 936 continue; 937 } 938 simple_unlock(&mntvnode_slock); 939 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK); 940 if (error) { 941 simple_lock(&mntvnode_slock); 942 if (error == ENOENT) 943 goto loop; 944 continue; 945 } 946 if ((error = VOP_FSYNC(vp, cred, 947 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0, p)) != 0) 948 allerror = error; 949 vput(vp); 950 simple_lock(&mntvnode_slock); 951 } 952 simple_unlock(&mntvnode_slock); 953 /* 954 * Force stale file system control information to be flushed. 955 */ 956 if ((error = VOP_FSYNC(pmp->pm_devvp, cred, 957 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0, p)) != 0) 958 allerror = error; 959 #ifdef QUOTA 960 /* qsync(mp); */ 961 #endif 962 return (allerror); 963 } 964 965 int 966 msdosfs_fhtovp(mp, fhp, vpp) 967 struct mount *mp; 968 struct fid *fhp; 969 struct vnode **vpp; 970 { 971 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 972 struct defid *defhp = (struct defid *) fhp; 973 struct denode *dep; 974 int error; 975 976 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 977 if (error) { 978 *vpp = NULLVP; 979 return (error); 980 } 981 *vpp = DETOV(dep); 982 return (0); 983 } 984 985 int 986 msdosfs_checkexp(mp, nam, exflagsp, credanonp) 987 struct mount *mp; 988 struct mbuf *nam; 989 int *exflagsp; 990 struct ucred **credanonp; 991 { 992 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 993 struct netcred *np; 994 995 np = vfs_export_lookup(mp, &pmp->pm_export, nam); 996 if (np == NULL) 997 return (EACCES); 998 *exflagsp = np->netc_exflags; 999 *credanonp = &np->netc_anon; 1000 return (0); 1001 } 1002 1003 int 1004 msdosfs_vptofh(vp, fhp) 1005 struct vnode *vp; 1006 struct fid *fhp; 1007 { 1008 struct denode *dep; 1009 struct defid *defhp; 1010 1011 dep = VTODE(vp); 1012 defhp = (struct defid *)fhp; 1013 defhp->defid_len = sizeof(struct defid); 1014 defhp->defid_dirclust = dep->de_dirclust; 1015 defhp->defid_dirofs = dep->de_diroffset; 1016 /* defhp->defid_gen = dep->de_gen; */ 1017 return (0); 1018 } 1019 1020 int 1021 msdosfs_vget(mp, ino, vpp) 1022 struct mount *mp; 1023 ino_t ino; 1024 struct vnode **vpp; 1025 { 1026 1027 return (EOPNOTSUPP); 1028 } 1029 1030 SYSCTL_SETUP(sysctl_vfs_msdosfs_setup, "sysctl vfs.msdosfs subtree setup") 1031 { 1032 1033 sysctl_createv(SYSCTL_PERMANENT, 1034 CTLTYPE_NODE, "vfs", NULL, 1035 NULL, 0, NULL, 0, 1036 CTL_VFS, CTL_EOL); 1037 sysctl_createv(SYSCTL_PERMANENT, 1038 CTLTYPE_NODE, "msdosfs", NULL, 1039 NULL, 0, NULL, 0, 1040 CTL_VFS, 4, CTL_EOL); 1041 /* 1042 * XXX the "4" above could be dynamic, thereby eliminating one 1043 * more instance of the "number to vfs" mapping problem, but 1044 * "4" is the order as taken from sys/mount.h 1045 */ 1046 } 1047