1 /* $NetBSD: msdosfs_vfsops.c,v 1.4 2003/04/16 21:44:19 christos 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 1.4 2003/04/16 21:44:19 christos 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/namei.h> 61 #include <sys/proc.h> 62 #include <sys/kernel.h> 63 #include <sys/vnode.h> 64 #include <miscfs/specfs/specdev.h> /* XXX */ /* defines v_rdev */ 65 #include <sys/mount.h> 66 #include <sys/buf.h> 67 #include <sys/file.h> 68 #include <sys/device.h> 69 #include <sys/disklabel.h> 70 #include <sys/ioctl.h> 71 #include <sys/malloc.h> 72 #include <sys/dirent.h> 73 #include <sys/stat.h> 74 #include <sys/conf.h> 75 76 #include <fs/msdosfs/bpb.h> 77 #include <fs/msdosfs/bootsect.h> 78 #include <fs/msdosfs/direntry.h> 79 #include <fs/msdosfs/denode.h> 80 #include <fs/msdosfs/msdosfsmount.h> 81 #include <fs/msdosfs/fat.h> 82 83 int msdosfs_mountroot __P((void)); 84 int msdosfs_mount __P((struct mount *, const char *, void *, 85 struct nameidata *, struct proc *)); 86 int msdosfs_start __P((struct mount *, int, struct proc *)); 87 int msdosfs_unmount __P((struct mount *, int, struct proc *)); 88 int msdosfs_root __P((struct mount *, struct vnode **)); 89 int msdosfs_quotactl __P((struct mount *, int, uid_t, caddr_t, struct proc *)); 90 int msdosfs_statfs __P((struct mount *, struct statfs *, struct proc *)); 91 int msdosfs_sync __P((struct mount *, int, struct ucred *, struct proc *)); 92 int msdosfs_vget __P((struct mount *, ino_t, struct vnode **)); 93 int msdosfs_fhtovp __P((struct mount *, struct fid *, struct vnode **)); 94 int msdosfs_checkexp __P((struct mount *, struct mbuf *, int *, 95 struct ucred **)); 96 int msdosfs_vptofh __P((struct vnode *, struct fid *)); 97 int msdosfs_sysctl __P((int *, u_int, void *, size_t *, void *, size_t, 98 struct proc *)); 99 100 int msdosfs_mountfs __P((struct vnode *, struct mount *, struct proc *, 101 struct msdosfs_args *)); 102 103 static int update_mp __P((struct mount *, struct msdosfs_args *)); 104 105 MALLOC_DEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOS FS mount structure"); 106 MALLOC_DEFINE(M_MSDOSFSFAT, "MSDOSFS fat", "MSDOS FS fat table"); 107 108 #define ROOTNAME "root_device" 109 110 extern const struct vnodeopv_desc msdosfs_vnodeop_opv_desc; 111 112 const struct vnodeopv_desc * const msdosfs_vnodeopv_descs[] = { 113 &msdosfs_vnodeop_opv_desc, 114 NULL, 115 }; 116 117 struct vfsops msdosfs_vfsops = { 118 MOUNT_MSDOS, 119 msdosfs_mount, 120 msdosfs_start, 121 msdosfs_unmount, 122 msdosfs_root, 123 msdosfs_quotactl, 124 msdosfs_statfs, 125 msdosfs_sync, 126 msdosfs_vget, 127 msdosfs_fhtovp, 128 msdosfs_vptofh, 129 msdosfs_init, 130 msdosfs_reinit, 131 msdosfs_done, 132 msdosfs_sysctl, 133 msdosfs_mountroot, 134 msdosfs_checkexp, 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_flags |= argp->flags & MSDOSFSMNT_MNTOPT; 150 151 /* 152 * GEMDOS knows nothing (yet) about win95 153 */ 154 if (pmp->pm_flags & MSDOSFSMNT_GEMDOSFS) 155 pmp->pm_flags |= MSDOSFSMNT_NOWIN95; 156 157 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 158 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 159 else if (!(pmp->pm_flags & 160 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 161 struct vnode *rootvp; 162 163 /* 164 * Try to divine whether to support Win'95 long filenames 165 */ 166 if (FAT32(pmp)) 167 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 168 else { 169 if ((error = msdosfs_root(mp, &rootvp)) != 0) 170 return error; 171 pmp->pm_flags |= findwin95(VTODE(rootvp)) 172 ? MSDOSFSMNT_LONGNAME 173 : MSDOSFSMNT_SHORTNAME; 174 vput(rootvp); 175 } 176 } 177 return 0; 178 } 179 180 int 181 msdosfs_mountroot() 182 { 183 struct mount *mp; 184 struct proc *p = curproc; /* XXX */ 185 int error; 186 struct msdosfs_args args; 187 188 if (root_device->dv_class != DV_DISK) 189 return (ENODEV); 190 191 /* 192 * Get vnodes for swapdev and rootdev. 193 */ 194 if (bdevvp(rootdev, &rootvp)) 195 panic("msdosfs_mountroot: can't setup rootvp"); 196 197 if ((error = vfs_rootmountalloc(MOUNT_MSDOS, "root_device", &mp))) { 198 vrele(rootvp); 199 return (error); 200 } 201 202 args.flags = 0; 203 args.uid = 0; 204 args.gid = 0; 205 args.mask = 0777; 206 207 if ((error = msdosfs_mountfs(rootvp, mp, p, &args)) != 0) { 208 mp->mnt_op->vfs_refcount--; 209 vfs_unbusy(mp); 210 free(mp, M_MOUNT); 211 vrele(rootvp); 212 return (error); 213 } 214 215 if ((error = update_mp(mp, &args)) != 0) { 216 (void)msdosfs_unmount(mp, 0, p); 217 vfs_unbusy(mp); 218 free(mp, M_MOUNT); 219 vrele(rootvp); 220 return (error); 221 } 222 223 simple_lock(&mountlist_slock); 224 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 225 simple_unlock(&mountlist_slock); 226 (void)msdosfs_statfs(mp, &mp->mnt_stat, p); 227 vfs_unbusy(mp); 228 return (0); 229 } 230 231 /* 232 * mp - path - addr in user space of mount point (ie /usr or whatever) 233 * data - addr in user space of mount params including the name of the block 234 * special file to treat as a filesystem. 235 */ 236 int 237 msdosfs_mount(mp, path, data, ndp, p) 238 struct mount *mp; 239 const char *path; 240 void *data; 241 struct nameidata *ndp; 242 struct proc *p; 243 { 244 struct vnode *devvp; /* vnode for blk device to mount */ 245 struct msdosfs_args args; /* will hold data from mount request */ 246 /* msdosfs specific mount control block */ 247 struct msdosfsmount *pmp = NULL; 248 int error, flags; 249 mode_t accessmode; 250 251 if (mp->mnt_flag & MNT_GETARGS) { 252 pmp = VFSTOMSDOSFS(mp); 253 if (pmp == NULL) 254 return EIO; 255 args.fspec = NULL; 256 args.uid = pmp->pm_uid; 257 args.gid = pmp->pm_gid; 258 args.mask = pmp->pm_mask; 259 args.flags = pmp->pm_flags; 260 vfs_showexport(mp, &args.export, &pmp->pm_export); 261 return copyout(&args, data, sizeof(args)); 262 } 263 error = copyin(data, &args, sizeof(struct msdosfs_args)); 264 if (error) 265 return (error); 266 /* 267 * If updating, check whether changing from read-only to 268 * read/write; if there is no device name, that's all we do. 269 */ 270 if (mp->mnt_flag & MNT_UPDATE) { 271 pmp = VFSTOMSDOSFS(mp); 272 error = 0; 273 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_RDONLY)) { 274 flags = WRITECLOSE; 275 if (mp->mnt_flag & MNT_FORCE) 276 flags |= FORCECLOSE; 277 error = vflush(mp, NULLVP, flags); 278 } 279 if (!error && (mp->mnt_flag & MNT_RELOAD)) 280 /* not yet implemented */ 281 error = EOPNOTSUPP; 282 if (error) 283 return (error); 284 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_WANTRDWR)) { 285 /* 286 * If upgrade to read-write by non-root, then verify 287 * that user has necessary permissions on the device. 288 */ 289 if (p->p_ucred->cr_uid != 0) { 290 devvp = pmp->pm_devvp; 291 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 292 error = VOP_ACCESS(devvp, VREAD | VWRITE, 293 p->p_ucred, p); 294 VOP_UNLOCK(devvp, 0); 295 if (error) 296 return (error); 297 } 298 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 299 } 300 if (args.fspec == 0) { 301 #ifdef __notyet__ /* doesn't work correctly with current mountd XXX */ 302 if (args.flags & MSDOSFSMNT_MNTOPT) { 303 pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT; 304 pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT; 305 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 306 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 307 } 308 #endif 309 /* 310 * Process export requests. 311 */ 312 return (vfs_export(mp, &pmp->pm_export, &args.export)); 313 } 314 } 315 /* 316 * Not an update, or updating the name: look up the name 317 * and verify that it refers to a sensible block device. 318 */ 319 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p); 320 if ((error = namei(ndp)) != 0) 321 return (error); 322 devvp = ndp->ni_vp; 323 324 if (devvp->v_type != VBLK) { 325 vrele(devvp); 326 return (ENOTBLK); 327 } 328 if (bdevsw_lookup(devvp->v_rdev) == NULL) { 329 vrele(devvp); 330 return (ENXIO); 331 } 332 /* 333 * If mount by non-root, then verify that user has necessary 334 * permissions on the device. 335 */ 336 if (p->p_ucred->cr_uid != 0) { 337 accessmode = VREAD; 338 if ((mp->mnt_flag & MNT_RDONLY) == 0) 339 accessmode |= VWRITE; 340 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 341 error = VOP_ACCESS(devvp, accessmode, p->p_ucred, p); 342 VOP_UNLOCK(devvp, 0); 343 if (error) { 344 vrele(devvp); 345 return (error); 346 } 347 } 348 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 349 error = msdosfs_mountfs(devvp, mp, p, &args); 350 #ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 351 pmp = VFSTOMSDOSFS(mp); 352 #endif 353 } else { 354 if (devvp != pmp->pm_devvp) 355 error = EINVAL; /* needs translation */ 356 else 357 vrele(devvp); 358 } 359 if (error) { 360 vrele(devvp); 361 return (error); 362 } 363 364 if ((error = update_mp(mp, &args)) != 0) { 365 msdosfs_unmount(mp, MNT_FORCE, p); 366 return error; 367 } 368 369 #ifdef MSDOSFS_DEBUG 370 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 371 #endif 372 return set_statfs_info(path, UIO_USERSPACE, args.fspec, UIO_USERSPACE, 373 mp, p); 374 } 375 376 int 377 msdosfs_mountfs(devvp, mp, p, argp) 378 struct vnode *devvp; 379 struct mount *mp; 380 struct proc *p; 381 struct msdosfs_args *argp; 382 { 383 struct msdosfsmount *pmp; 384 struct buf *bp; 385 dev_t dev = devvp->v_rdev; 386 struct partinfo dpart; 387 union bootsector *bsp; 388 struct byte_bpb33 *b33; 389 struct byte_bpb50 *b50; 390 struct byte_bpb710 *b710; 391 u_int8_t SecPerClust; 392 int ronly, error; 393 int bsize = 0, dtype = 0, tmp; 394 u_long dirsperblk; 395 396 /* 397 * Disallow multiple mounts of the same device. 398 * Disallow mounting of a device that is currently in use 399 * (except for root, which might share swap device for miniroot). 400 * Flush out any old buffers remaining from a previous use. 401 */ 402 if ((error = vfs_mountedon(devvp)) != 0) 403 return (error); 404 if (vcount(devvp) > 1 && devvp != rootvp) 405 return (EBUSY); 406 if ((error = vinvalbuf(devvp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) 407 return (error); 408 409 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 410 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p); 411 if (error) 412 return (error); 413 414 bp = NULL; /* both used in error_exit */ 415 pmp = NULL; 416 417 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 418 /* 419 * We need the disklabel to calculate the size of a FAT entry 420 * later on. Also make sure the partition contains a filesystem 421 * of type FS_MSDOS. This doesn't work for floppies, so we have 422 * to check for them too. 423 * 424 * At least some parts of the msdos fs driver seem to assume 425 * that the size of a disk block will always be 512 bytes. 426 * Let's check it... 427 */ 428 error = VOP_IOCTL(devvp, DIOCGPART, &dpart, FREAD, NOCRED, p); 429 if (error) 430 goto error_exit; 431 tmp = dpart.part->p_fstype; 432 dtype = dpart.disklab->d_type; 433 bsize = dpart.disklab->d_secsize; 434 if (bsize != 512 || (dtype!=DTYPE_FLOPPY && tmp!=FS_MSDOS)) { 435 error = EINVAL; 436 goto error_exit; 437 } 438 } 439 440 /* 441 * Read the boot sector of the filesystem, and then check the 442 * boot signature. If not a dos boot sector then error out. 443 */ 444 if ((error = bread(devvp, 0, 512, NOCRED, &bp)) != 0) 445 goto error_exit; 446 bp->b_flags |= B_AGE; 447 bsp = (union bootsector *)bp->b_data; 448 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 449 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 450 b710 = (struct byte_bpb710 *)bsp->bs710.bsPBP; 451 452 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 453 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 454 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 455 error = EINVAL; 456 goto error_exit; 457 } 458 } 459 460 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK); 461 memset(pmp, 0, sizeof *pmp); 462 pmp->pm_mountp = mp; 463 464 /* 465 * Compute several useful quantities from the bpb in the 466 * bootsector. Copy in the dos 5 variant of the bpb then fix up 467 * the fields that are different between dos 5 and dos 3.3. 468 */ 469 SecPerClust = b50->bpbSecPerClust; 470 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 471 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 472 pmp->pm_FATs = b50->bpbFATs; 473 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 474 pmp->pm_Sectors = getushort(b50->bpbSectors); 475 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 476 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 477 pmp->pm_Heads = getushort(b50->bpbHeads); 478 pmp->pm_Media = b50->bpbMedia; 479 480 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 481 /* XXX - We should probably check more values here */ 482 if (!pmp->pm_BytesPerSec || !SecPerClust 483 || pmp->pm_Heads > 255 || pmp->pm_SecPerTrack > 63) { 484 error = EINVAL; 485 goto error_exit; 486 } 487 } 488 489 if (pmp->pm_Sectors == 0) { 490 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 491 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 492 } else { 493 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 494 pmp->pm_HugeSectors = pmp->pm_Sectors; 495 } 496 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 497 if (pmp->pm_HugeSectors > 0xffffffff / dirsperblk + 1) { 498 /* 499 * We cannot deal currently with this size of disk 500 * due to fileid limitations (see msdosfs_getattr and 501 * msdosfs_readdir) 502 */ 503 error = EINVAL; 504 goto error_exit; 505 } 506 507 if (pmp->pm_RootDirEnts == 0) { 508 if (bsp->bs710.bsBootSectSig2 != BOOTSIG2 509 || bsp->bs710.bsBootSectSig3 != BOOTSIG3 510 || pmp->pm_Sectors 511 || pmp->pm_FATsecs 512 || getushort(b710->bpbFSVers)) { 513 error = EINVAL; 514 goto error_exit; 515 } 516 pmp->pm_fatmask = FAT32_MASK; 517 pmp->pm_fatmult = 4; 518 pmp->pm_fatdiv = 1; 519 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 520 521 /* mirrorring is enabled if the FATMIRROR bit is not set */ 522 if ((getushort(b710->bpbExtFlags) & FATMIRROR) == 0) 523 pmp->pm_flags |= MSDOSFS_FATMIRROR; 524 else 525 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 526 } else 527 pmp->pm_flags |= MSDOSFS_FATMIRROR; 528 529 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 530 if (FAT32(pmp)) { 531 /* 532 * GEMDOS doesn't know fat32. 533 */ 534 error = EINVAL; 535 goto error_exit; 536 } 537 538 /* 539 * Check a few values (could do some more): 540 * - logical sector size: power of 2, >= block size 541 * - sectors per cluster: power of 2, >= 1 542 * - number of sectors: >= 1, <= size of partition 543 */ 544 if ( (SecPerClust == 0) 545 || (SecPerClust & (SecPerClust - 1)) 546 || (pmp->pm_BytesPerSec < bsize) 547 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 548 || (pmp->pm_HugeSectors == 0) 549 || (pmp->pm_HugeSectors * (pmp->pm_BytesPerSec / bsize) 550 > dpart.part->p_size) 551 ) { 552 error = EINVAL; 553 goto error_exit; 554 } 555 /* 556 * XXX - Many parts of the msdos fs driver seem to assume that 557 * the number of bytes per logical sector (BytesPerSec) will 558 * always be the same as the number of bytes per disk block 559 * Let's pretend it is. 560 */ 561 tmp = pmp->pm_BytesPerSec / bsize; 562 pmp->pm_BytesPerSec = bsize; 563 pmp->pm_HugeSectors *= tmp; 564 pmp->pm_HiddenSects *= tmp; 565 pmp->pm_ResSectors *= tmp; 566 pmp->pm_Sectors *= tmp; 567 pmp->pm_FATsecs *= tmp; 568 SecPerClust *= tmp; 569 } 570 pmp->pm_fatblk = pmp->pm_ResSectors; 571 if (FAT32(pmp)) { 572 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 573 pmp->pm_firstcluster = pmp->pm_fatblk 574 + (pmp->pm_FATs * pmp->pm_FATsecs); 575 pmp->pm_fsinfo = getushort(b710->bpbFSInfo); 576 } else { 577 pmp->pm_rootdirblk = pmp->pm_fatblk + 578 (pmp->pm_FATs * pmp->pm_FATsecs); 579 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 580 + pmp->pm_BytesPerSec - 1) 581 / pmp->pm_BytesPerSec;/* in sectors */ 582 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 583 } 584 585 pmp->pm_nmbrofclusters = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 586 SecPerClust; 587 pmp->pm_maxcluster = pmp->pm_nmbrofclusters + 1; 588 pmp->pm_fatsize = pmp->pm_FATsecs * pmp->pm_BytesPerSec; 589 590 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 591 if (pmp->pm_nmbrofclusters <= (0xff0 - 2) 592 && (dtype == DTYPE_FLOPPY 593 || (dtype == DTYPE_VND 594 && (pmp->pm_Heads == 1 || pmp->pm_Heads == 2))) 595 ) { 596 pmp->pm_fatmask = FAT12_MASK; 597 pmp->pm_fatmult = 3; 598 pmp->pm_fatdiv = 2; 599 } else { 600 pmp->pm_fatmask = FAT16_MASK; 601 pmp->pm_fatmult = 2; 602 pmp->pm_fatdiv = 1; 603 } 604 } else if (pmp->pm_fatmask == 0) { 605 if (pmp->pm_maxcluster 606 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 607 /* 608 * This will usually be a floppy disk. This size makes 609 * sure that one fat entry will not be split across 610 * multiple blocks. 611 */ 612 pmp->pm_fatmask = FAT12_MASK; 613 pmp->pm_fatmult = 3; 614 pmp->pm_fatdiv = 2; 615 } else { 616 pmp->pm_fatmask = FAT16_MASK; 617 pmp->pm_fatmult = 2; 618 pmp->pm_fatdiv = 1; 619 } 620 } 621 if (FAT12(pmp)) 622 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 623 else 624 pmp->pm_fatblocksize = MAXBSIZE; 625 626 pmp->pm_fatblocksec = pmp->pm_fatblocksize / pmp->pm_BytesPerSec; 627 pmp->pm_bnshift = ffs(pmp->pm_BytesPerSec) - 1; 628 629 /* 630 * Compute mask and shift value for isolating cluster relative byte 631 * offsets and cluster numbers from a file offset. 632 */ 633 pmp->pm_bpcluster = SecPerClust * pmp->pm_BytesPerSec; 634 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 635 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 636 637 /* 638 * Check for valid cluster size 639 * must be a power of 2 640 */ 641 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 642 error = EINVAL; 643 goto error_exit; 644 } 645 646 /* 647 * Release the bootsector buffer. 648 */ 649 brelse(bp); 650 bp = NULL; 651 652 /* 653 * Check FSInfo. 654 */ 655 if (pmp->pm_fsinfo) { 656 struct fsinfo *fp; 657 658 if ((error = bread(devvp, pmp->pm_fsinfo, 1024, NOCRED, &bp)) != 0) 659 goto error_exit; 660 fp = (struct fsinfo *)bp->b_data; 661 if (!memcmp(fp->fsisig1, "RRaA", 4) 662 && !memcmp(fp->fsisig2, "rrAa", 4) 663 && !memcmp(fp->fsisig3, "\0\0\125\252", 4) 664 && !memcmp(fp->fsisig4, "\0\0\125\252", 4)) 665 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 666 else 667 pmp->pm_fsinfo = 0; 668 brelse(bp); 669 bp = NULL; 670 } 671 672 /* 673 * Check and validate (or perhaps invalidate?) the fsinfo structure? 674 * XXX 675 */ 676 if (pmp->pm_fsinfo) { 677 if (pmp->pm_nxtfree == (u_long)-1) 678 pmp->pm_fsinfo = 0; 679 } 680 681 /* 682 * Allocate memory for the bitmap of allocated clusters, and then 683 * fill it in. 684 */ 685 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 686 / N_INUSEBITS) 687 * sizeof(*pmp->pm_inusemap), 688 M_MSDOSFSFAT, M_WAITOK); 689 690 /* 691 * fillinusemap() needs pm_devvp. 692 */ 693 pmp->pm_dev = dev; 694 pmp->pm_devvp = devvp; 695 696 /* 697 * Have the inuse map filled in. 698 */ 699 if ((error = fillinusemap(pmp)) != 0) 700 goto error_exit; 701 702 /* 703 * If they want fat updates to be synchronous then let them suffer 704 * the performance degradation in exchange for the on disk copy of 705 * the fat being correct just about all the time. I suppose this 706 * would be a good thing to turn on if the kernel is still flakey. 707 */ 708 if (mp->mnt_flag & MNT_SYNCHRONOUS) 709 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 710 711 /* 712 * Finish up. 713 */ 714 if (ronly) 715 pmp->pm_flags |= MSDOSFSMNT_RONLY; 716 else 717 pmp->pm_fmod = 1; 718 mp->mnt_data = pmp; 719 mp->mnt_stat.f_fsid.val[0] = (long)dev; 720 mp->mnt_stat.f_fsid.val[1] = makefstype(MOUNT_MSDOS); 721 mp->mnt_flag |= MNT_LOCAL; 722 mp->mnt_dev_bshift = pmp->pm_bnshift; 723 mp->mnt_fs_bshift = pmp->pm_cnshift; 724 725 #ifdef QUOTA 726 /* 727 * If we ever do quotas for DOS filesystems this would be a place 728 * to fill in the info in the msdosfsmount structure. You dolt, 729 * quotas on dos filesystems make no sense because files have no 730 * owners on dos filesystems. of course there is some empty space 731 * in the directory entry where we could put uid's and gid's. 732 */ 733 #endif 734 devvp->v_specmountpoint = mp; 735 736 return (0); 737 738 error_exit:; 739 if (bp) 740 brelse(bp); 741 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 742 (void) VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, p); 743 VOP_UNLOCK(devvp, 0); 744 if (pmp) { 745 if (pmp->pm_inusemap) 746 free(pmp->pm_inusemap, M_MSDOSFSFAT); 747 free(pmp, M_MSDOSFSMNT); 748 mp->mnt_data = NULL; 749 } 750 return (error); 751 } 752 753 int 754 msdosfs_start(mp, flags, p) 755 struct mount *mp; 756 int flags; 757 struct proc *p; 758 { 759 760 return (0); 761 } 762 763 /* 764 * Unmount the filesystem described by mp. 765 */ 766 int 767 msdosfs_unmount(mp, mntflags, p) 768 struct mount *mp; 769 int mntflags; 770 struct proc *p; 771 { 772 struct msdosfsmount *pmp; 773 int error, flags; 774 775 flags = 0; 776 if (mntflags & MNT_FORCE) 777 flags |= FORCECLOSE; 778 #ifdef QUOTA 779 #endif 780 if ((error = vflush(mp, NULLVP, flags)) != 0) 781 return (error); 782 pmp = VFSTOMSDOSFS(mp); 783 if (pmp->pm_devvp->v_type != VBAD) 784 pmp->pm_devvp->v_specmountpoint = NULL; 785 #ifdef MSDOSFS_DEBUG 786 { 787 struct vnode *vp = pmp->pm_devvp; 788 789 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 790 printf("flag %08x, usecount %d, writecount %ld, holdcnt %ld\n", 791 vp->v_flag, vp->v_usecount, vp->v_writecount, vp->v_holdcnt); 792 printf("id %lu, mount %p, op %p\n", 793 vp->v_id, vp->v_mount, vp->v_op); 794 printf("freef %p, freeb %p, mount %p\n", 795 vp->v_freelist.tqe_next, vp->v_freelist.tqe_prev, 796 vp->v_mount); 797 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %d, type %d\n", 798 vp->v_cleanblkhd.lh_first, 799 vp->v_dirtyblkhd.lh_first, 800 vp->v_numoutput, vp->v_type); 801 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 802 vp->v_socket, vp->v_tag, 803 ((u_int *)vp->v_data)[0], 804 ((u_int *)vp->v_data)[1]); 805 } 806 #endif 807 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY); 808 error = VOP_CLOSE(pmp->pm_devvp, 809 pmp->pm_flags & MSDOSFSMNT_RONLY ? FREAD : FREAD|FWRITE, NOCRED, p); 810 vput(pmp->pm_devvp); 811 free(pmp->pm_inusemap, M_MSDOSFSFAT); 812 free(pmp, M_MSDOSFSMNT); 813 mp->mnt_data = NULL; 814 mp->mnt_flag &= ~MNT_LOCAL; 815 return (error); 816 } 817 818 int 819 msdosfs_root(mp, vpp) 820 struct mount *mp; 821 struct vnode **vpp; 822 { 823 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 824 struct denode *ndep; 825 int error; 826 827 #ifdef MSDOSFS_DEBUG 828 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 829 #endif 830 if ((error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep)) != 0) 831 return (error); 832 *vpp = DETOV(ndep); 833 return (0); 834 } 835 836 int 837 msdosfs_quotactl(mp, cmds, uid, arg, p) 838 struct mount *mp; 839 int cmds; 840 uid_t uid; 841 caddr_t arg; 842 struct proc *p; 843 { 844 845 #ifdef QUOTA 846 return (EOPNOTSUPP); 847 #else 848 return (EOPNOTSUPP); 849 #endif 850 } 851 852 int 853 msdosfs_statfs(mp, sbp, p) 854 struct mount *mp; 855 struct statfs *sbp; 856 struct proc *p; 857 { 858 struct msdosfsmount *pmp; 859 860 pmp = VFSTOMSDOSFS(mp); 861 #ifdef COMPAT_09 862 sbp->f_type = 4; 863 #else 864 sbp->f_type = 0; 865 #endif 866 sbp->f_bsize = pmp->pm_bpcluster; 867 sbp->f_iosize = pmp->pm_bpcluster; 868 sbp->f_blocks = pmp->pm_nmbrofclusters; 869 sbp->f_bfree = pmp->pm_freeclustercount; 870 sbp->f_bavail = pmp->pm_freeclustercount; 871 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 872 sbp->f_ffree = 0; /* what to put in here? */ 873 copy_statfs_info(sbp, mp); 874 return (0); 875 } 876 877 int 878 msdosfs_sync(mp, waitfor, cred, p) 879 struct mount *mp; 880 int waitfor; 881 struct ucred *cred; 882 struct proc *p; 883 { 884 struct vnode *vp, *nvp; 885 struct denode *dep; 886 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 887 int error, allerror = 0; 888 889 /* 890 * If we ever switch to not updating all of the fats all the time, 891 * this would be the place to update them from the first one. 892 */ 893 if (pmp->pm_fmod != 0) { 894 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 895 panic("msdosfs_sync: rofs mod"); 896 else { 897 /* update fats here */ 898 } 899 } 900 /* 901 * Write back each (modified) denode. 902 */ 903 simple_lock(&mntvnode_slock); 904 loop: 905 for (vp = mp->mnt_vnodelist.lh_first; vp != NULL; vp = nvp) { 906 /* 907 * If the vnode that we are about to sync is no longer 908 * assoicated with this mount point, start over. 909 */ 910 if (vp->v_mount != mp) 911 goto loop; 912 simple_lock(&vp->v_interlock); 913 nvp = vp->v_mntvnodes.le_next; 914 dep = VTODE(vp); 915 if (waitfor == MNT_LAZY || vp->v_type == VNON || 916 (((dep->de_flag & 917 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0) && 918 (LIST_EMPTY(&vp->v_dirtyblkhd) && 919 vp->v_uobj.uo_npages == 0))) { 920 simple_unlock(&vp->v_interlock); 921 continue; 922 } 923 simple_unlock(&mntvnode_slock); 924 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK); 925 if (error) { 926 simple_lock(&mntvnode_slock); 927 if (error == ENOENT) 928 goto loop; 929 continue; 930 } 931 if ((error = VOP_FSYNC(vp, cred, 932 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0, p)) != 0) 933 allerror = error; 934 vput(vp); 935 simple_lock(&mntvnode_slock); 936 } 937 simple_unlock(&mntvnode_slock); 938 /* 939 * Force stale file system control information to be flushed. 940 */ 941 if ((error = VOP_FSYNC(pmp->pm_devvp, cred, 942 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0, p)) != 0) 943 allerror = error; 944 #ifdef QUOTA 945 /* qsync(mp); */ 946 #endif 947 return (allerror); 948 } 949 950 int 951 msdosfs_fhtovp(mp, fhp, vpp) 952 struct mount *mp; 953 struct fid *fhp; 954 struct vnode **vpp; 955 { 956 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 957 struct defid *defhp = (struct defid *) fhp; 958 struct denode *dep; 959 int error; 960 961 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 962 if (error) { 963 *vpp = NULLVP; 964 return (error); 965 } 966 *vpp = DETOV(dep); 967 return (0); 968 } 969 970 int 971 msdosfs_checkexp(mp, nam, exflagsp, credanonp) 972 struct mount *mp; 973 struct mbuf *nam; 974 int *exflagsp; 975 struct ucred **credanonp; 976 { 977 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 978 struct netcred *np; 979 980 np = vfs_export_lookup(mp, &pmp->pm_export, nam); 981 if (np == NULL) 982 return (EACCES); 983 *exflagsp = np->netc_exflags; 984 *credanonp = &np->netc_anon; 985 return (0); 986 } 987 988 int 989 msdosfs_vptofh(vp, fhp) 990 struct vnode *vp; 991 struct fid *fhp; 992 { 993 struct denode *dep; 994 struct defid *defhp; 995 996 dep = VTODE(vp); 997 defhp = (struct defid *)fhp; 998 defhp->defid_len = sizeof(struct defid); 999 defhp->defid_dirclust = dep->de_dirclust; 1000 defhp->defid_dirofs = dep->de_diroffset; 1001 /* defhp->defid_gen = dep->de_gen; */ 1002 return (0); 1003 } 1004 1005 int 1006 msdosfs_vget(mp, ino, vpp) 1007 struct mount *mp; 1008 ino_t ino; 1009 struct vnode **vpp; 1010 { 1011 1012 return (EOPNOTSUPP); 1013 } 1014 1015 int 1016 msdosfs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) 1017 int *name; 1018 u_int namelen; 1019 void *oldp; 1020 size_t *oldlenp; 1021 void *newp; 1022 size_t newlen; 1023 struct proc *p; 1024 { 1025 return (EOPNOTSUPP); 1026 } 1027