1 /* $NetBSD: msdosfs_vfsops.c,v 1.2 2003/02/01 06:23:41 thorpej 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 1.2 2003/02/01 06:23:41 thorpej 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 size_t size; 249 int error, flags; 250 mode_t accessmode; 251 252 if (mp->mnt_flag & MNT_GETARGS) { 253 pmp = VFSTOMSDOSFS(mp); 254 if (pmp == NULL) 255 return EIO; 256 args.fspec = NULL; 257 args.uid = pmp->pm_uid; 258 args.gid = pmp->pm_gid; 259 args.mask = pmp->pm_mask; 260 args.flags = pmp->pm_flags; 261 vfs_showexport(mp, &args.export, &pmp->pm_export); 262 return copyout(&args, data, sizeof(args)); 263 } 264 error = copyin(data, (caddr_t)&args, sizeof(struct msdosfs_args)); 265 if (error) 266 return (error); 267 /* 268 * If updating, check whether changing from read-only to 269 * read/write; if there is no device name, that's all we do. 270 */ 271 if (mp->mnt_flag & MNT_UPDATE) { 272 pmp = VFSTOMSDOSFS(mp); 273 error = 0; 274 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_RDONLY)) { 275 flags = WRITECLOSE; 276 if (mp->mnt_flag & MNT_FORCE) 277 flags |= FORCECLOSE; 278 error = vflush(mp, NULLVP, flags); 279 } 280 if (!error && (mp->mnt_flag & MNT_RELOAD)) 281 /* not yet implemented */ 282 error = EOPNOTSUPP; 283 if (error) 284 return (error); 285 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_WANTRDWR)) { 286 /* 287 * If upgrade to read-write by non-root, then verify 288 * that user has necessary permissions on the device. 289 */ 290 if (p->p_ucred->cr_uid != 0) { 291 devvp = pmp->pm_devvp; 292 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 293 error = VOP_ACCESS(devvp, VREAD | VWRITE, 294 p->p_ucred, p); 295 VOP_UNLOCK(devvp, 0); 296 if (error) 297 return (error); 298 } 299 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 300 } 301 if (args.fspec == 0) { 302 #ifdef __notyet__ /* doesn't work correctly with current mountd XXX */ 303 if (args.flags & MSDOSFSMNT_MNTOPT) { 304 pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT; 305 pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT; 306 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 307 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 308 } 309 #endif 310 /* 311 * Process export requests. 312 */ 313 return (vfs_export(mp, &pmp->pm_export, &args.export)); 314 } 315 } 316 /* 317 * Not an update, or updating the name: look up the name 318 * and verify that it refers to a sensible block device. 319 */ 320 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p); 321 if ((error = namei(ndp)) != 0) 322 return (error); 323 devvp = ndp->ni_vp; 324 325 if (devvp->v_type != VBLK) { 326 vrele(devvp); 327 return (ENOTBLK); 328 } 329 if (bdevsw_lookup(devvp->v_rdev) == NULL) { 330 vrele(devvp); 331 return (ENXIO); 332 } 333 /* 334 * If mount by non-root, then verify that user has necessary 335 * permissions on the device. 336 */ 337 if (p->p_ucred->cr_uid != 0) { 338 accessmode = VREAD; 339 if ((mp->mnt_flag & MNT_RDONLY) == 0) 340 accessmode |= VWRITE; 341 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 342 error = VOP_ACCESS(devvp, accessmode, p->p_ucred, p); 343 VOP_UNLOCK(devvp, 0); 344 if (error) { 345 vrele(devvp); 346 return (error); 347 } 348 } 349 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 350 error = msdosfs_mountfs(devvp, mp, p, &args); 351 #ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 352 pmp = VFSTOMSDOSFS(mp); 353 #endif 354 } else { 355 if (devvp != pmp->pm_devvp) 356 error = EINVAL; /* needs translation */ 357 else 358 vrele(devvp); 359 } 360 if (error) { 361 vrele(devvp); 362 return (error); 363 } 364 365 if ((error = update_mp(mp, &args)) != 0) { 366 msdosfs_unmount(mp, MNT_FORCE, p); 367 return error; 368 } 369 370 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); 371 memset(mp->mnt_stat.f_mntonname + size, 0, MNAMELEN - size); 372 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 373 &size); 374 memset(mp->mnt_stat.f_mntfromname + size, 0, MNAMELEN - size); 375 #ifdef MSDOSFS_DEBUG 376 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 377 #endif 378 return (0); 379 } 380 381 int 382 msdosfs_mountfs(devvp, mp, p, argp) 383 struct vnode *devvp; 384 struct mount *mp; 385 struct proc *p; 386 struct msdosfs_args *argp; 387 { 388 struct msdosfsmount *pmp; 389 struct buf *bp; 390 dev_t dev = devvp->v_rdev; 391 struct partinfo dpart; 392 union bootsector *bsp; 393 struct byte_bpb33 *b33; 394 struct byte_bpb50 *b50; 395 struct byte_bpb710 *b710; 396 u_int8_t SecPerClust; 397 int ronly, error; 398 int bsize = 0, dtype = 0, tmp; 399 u_long dirsperblk; 400 401 /* 402 * Disallow multiple mounts of the same device. 403 * Disallow mounting of a device that is currently in use 404 * (except for root, which might share swap device for miniroot). 405 * Flush out any old buffers remaining from a previous use. 406 */ 407 if ((error = vfs_mountedon(devvp)) != 0) 408 return (error); 409 if (vcount(devvp) > 1 && devvp != rootvp) 410 return (EBUSY); 411 if ((error = vinvalbuf(devvp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) 412 return (error); 413 414 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 415 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p); 416 if (error) 417 return (error); 418 419 bp = NULL; /* both used in error_exit */ 420 pmp = NULL; 421 422 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 423 /* 424 * We need the disklabel to calculate the size of a FAT entry 425 * later on. Also make sure the partition contains a filesystem 426 * of type FS_MSDOS. This doesn't work for floppies, so we have 427 * to check for them too. 428 * 429 * At least some parts of the msdos fs driver seem to assume 430 * that the size of a disk block will always be 512 bytes. 431 * Let's check it... 432 */ 433 error = VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, 434 FREAD, NOCRED, p); 435 if (error) 436 goto error_exit; 437 tmp = dpart.part->p_fstype; 438 dtype = dpart.disklab->d_type; 439 bsize = dpart.disklab->d_secsize; 440 if (bsize != 512 || (dtype!=DTYPE_FLOPPY && tmp!=FS_MSDOS)) { 441 error = EINVAL; 442 goto error_exit; 443 } 444 } 445 446 /* 447 * Read the boot sector of the filesystem, and then check the 448 * boot signature. If not a dos boot sector then error out. 449 */ 450 if ((error = bread(devvp, 0, 512, NOCRED, &bp)) != 0) 451 goto error_exit; 452 bp->b_flags |= B_AGE; 453 bsp = (union bootsector *)bp->b_data; 454 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 455 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 456 b710 = (struct byte_bpb710 *)bsp->bs710.bsPBP; 457 458 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 459 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 460 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 461 error = EINVAL; 462 goto error_exit; 463 } 464 } 465 466 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK); 467 memset((caddr_t)pmp, 0, sizeof *pmp); 468 pmp->pm_mountp = mp; 469 470 /* 471 * Compute several useful quantities from the bpb in the 472 * bootsector. Copy in the dos 5 variant of the bpb then fix up 473 * the fields that are different between dos 5 and dos 3.3. 474 */ 475 SecPerClust = b50->bpbSecPerClust; 476 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 477 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 478 pmp->pm_FATs = b50->bpbFATs; 479 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 480 pmp->pm_Sectors = getushort(b50->bpbSectors); 481 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 482 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 483 pmp->pm_Heads = getushort(b50->bpbHeads); 484 pmp->pm_Media = b50->bpbMedia; 485 486 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 487 /* XXX - We should probably check more values here */ 488 if (!pmp->pm_BytesPerSec || !SecPerClust 489 || pmp->pm_Heads > 255 || pmp->pm_SecPerTrack > 63) { 490 error = EINVAL; 491 goto error_exit; 492 } 493 } 494 495 if (pmp->pm_Sectors == 0) { 496 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 497 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 498 } else { 499 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 500 pmp->pm_HugeSectors = pmp->pm_Sectors; 501 } 502 dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry); 503 if (pmp->pm_HugeSectors > 0xffffffff / dirsperblk + 1) { 504 /* 505 * We cannot deal currently with this size of disk 506 * due to fileid limitations (see msdosfs_getattr and 507 * msdosfs_readdir) 508 */ 509 error = EINVAL; 510 goto error_exit; 511 } 512 513 if (pmp->pm_RootDirEnts == 0) { 514 if (bsp->bs710.bsBootSectSig2 != BOOTSIG2 515 || bsp->bs710.bsBootSectSig3 != BOOTSIG3 516 || pmp->pm_Sectors 517 || pmp->pm_FATsecs 518 || getushort(b710->bpbFSVers)) { 519 error = EINVAL; 520 goto error_exit; 521 } 522 pmp->pm_fatmask = FAT32_MASK; 523 pmp->pm_fatmult = 4; 524 pmp->pm_fatdiv = 1; 525 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 526 527 /* mirrorring is enabled if the FATMIRROR bit is not set */ 528 if ((getushort(b710->bpbExtFlags) & FATMIRROR) == 0) 529 pmp->pm_flags |= MSDOSFS_FATMIRROR; 530 else 531 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 532 } else 533 pmp->pm_flags |= MSDOSFS_FATMIRROR; 534 535 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 536 if (FAT32(pmp)) { 537 /* 538 * GEMDOS doesn't know fat32. 539 */ 540 error = EINVAL; 541 goto error_exit; 542 } 543 544 /* 545 * Check a few values (could do some more): 546 * - logical sector size: power of 2, >= block size 547 * - sectors per cluster: power of 2, >= 1 548 * - number of sectors: >= 1, <= size of partition 549 */ 550 if ( (SecPerClust == 0) 551 || (SecPerClust & (SecPerClust - 1)) 552 || (pmp->pm_BytesPerSec < bsize) 553 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 554 || (pmp->pm_HugeSectors == 0) 555 || (pmp->pm_HugeSectors * (pmp->pm_BytesPerSec / bsize) 556 > dpart.part->p_size) 557 ) { 558 error = EINVAL; 559 goto error_exit; 560 } 561 /* 562 * XXX - Many parts of the msdos fs driver seem to assume that 563 * the number of bytes per logical sector (BytesPerSec) will 564 * always be the same as the number of bytes per disk block 565 * Let's pretend it is. 566 */ 567 tmp = pmp->pm_BytesPerSec / bsize; 568 pmp->pm_BytesPerSec = bsize; 569 pmp->pm_HugeSectors *= tmp; 570 pmp->pm_HiddenSects *= tmp; 571 pmp->pm_ResSectors *= tmp; 572 pmp->pm_Sectors *= tmp; 573 pmp->pm_FATsecs *= tmp; 574 SecPerClust *= tmp; 575 } 576 pmp->pm_fatblk = pmp->pm_ResSectors; 577 if (FAT32(pmp)) { 578 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 579 pmp->pm_firstcluster = pmp->pm_fatblk 580 + (pmp->pm_FATs * pmp->pm_FATsecs); 581 pmp->pm_fsinfo = getushort(b710->bpbFSInfo); 582 } else { 583 pmp->pm_rootdirblk = pmp->pm_fatblk + 584 (pmp->pm_FATs * pmp->pm_FATsecs); 585 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 586 + pmp->pm_BytesPerSec - 1) 587 / pmp->pm_BytesPerSec;/* in sectors */ 588 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 589 } 590 591 pmp->pm_nmbrofclusters = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 592 SecPerClust; 593 pmp->pm_maxcluster = pmp->pm_nmbrofclusters + 1; 594 pmp->pm_fatsize = pmp->pm_FATsecs * pmp->pm_BytesPerSec; 595 596 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 597 if (pmp->pm_nmbrofclusters <= (0xff0 - 2) 598 && (dtype == DTYPE_FLOPPY 599 || (dtype == DTYPE_VND 600 && (pmp->pm_Heads == 1 || pmp->pm_Heads == 2))) 601 ) { 602 pmp->pm_fatmask = FAT12_MASK; 603 pmp->pm_fatmult = 3; 604 pmp->pm_fatdiv = 2; 605 } else { 606 pmp->pm_fatmask = FAT16_MASK; 607 pmp->pm_fatmult = 2; 608 pmp->pm_fatdiv = 1; 609 } 610 } else if (pmp->pm_fatmask == 0) { 611 if (pmp->pm_maxcluster 612 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 613 /* 614 * This will usually be a floppy disk. This size makes 615 * sure that one fat entry will not be split across 616 * multiple blocks. 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 } 627 if (FAT12(pmp)) 628 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 629 else 630 pmp->pm_fatblocksize = MAXBSIZE; 631 632 pmp->pm_fatblocksec = pmp->pm_fatblocksize / pmp->pm_BytesPerSec; 633 pmp->pm_bnshift = ffs(pmp->pm_BytesPerSec) - 1; 634 635 /* 636 * Compute mask and shift value for isolating cluster relative byte 637 * offsets and cluster numbers from a file offset. 638 */ 639 pmp->pm_bpcluster = SecPerClust * pmp->pm_BytesPerSec; 640 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 641 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 642 643 /* 644 * Check for valid cluster size 645 * must be a power of 2 646 */ 647 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 648 error = EINVAL; 649 goto error_exit; 650 } 651 652 /* 653 * Release the bootsector buffer. 654 */ 655 brelse(bp); 656 bp = NULL; 657 658 /* 659 * Check FSInfo. 660 */ 661 if (pmp->pm_fsinfo) { 662 struct fsinfo *fp; 663 664 if ((error = bread(devvp, pmp->pm_fsinfo, 1024, NOCRED, &bp)) != 0) 665 goto error_exit; 666 fp = (struct fsinfo *)bp->b_data; 667 if (!memcmp(fp->fsisig1, "RRaA", 4) 668 && !memcmp(fp->fsisig2, "rrAa", 4) 669 && !memcmp(fp->fsisig3, "\0\0\125\252", 4) 670 && !memcmp(fp->fsisig4, "\0\0\125\252", 4)) 671 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 672 else 673 pmp->pm_fsinfo = 0; 674 brelse(bp); 675 bp = NULL; 676 } 677 678 /* 679 * Check and validate (or perhaps invalidate?) the fsinfo structure? 680 * XXX 681 */ 682 if (pmp->pm_fsinfo) { 683 if (pmp->pm_nxtfree == (u_long)-1) 684 pmp->pm_fsinfo = 0; 685 } 686 687 /* 688 * Allocate memory for the bitmap of allocated clusters, and then 689 * fill it in. 690 */ 691 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 692 / N_INUSEBITS) 693 * sizeof(*pmp->pm_inusemap), 694 M_MSDOSFSFAT, M_WAITOK); 695 696 /* 697 * fillinusemap() needs pm_devvp. 698 */ 699 pmp->pm_dev = dev; 700 pmp->pm_devvp = devvp; 701 702 /* 703 * Have the inuse map filled in. 704 */ 705 if ((error = fillinusemap(pmp)) != 0) 706 goto error_exit; 707 708 /* 709 * If they want fat updates to be synchronous then let them suffer 710 * the performance degradation in exchange for the on disk copy of 711 * the fat being correct just about all the time. I suppose this 712 * would be a good thing to turn on if the kernel is still flakey. 713 */ 714 if (mp->mnt_flag & MNT_SYNCHRONOUS) 715 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 716 717 /* 718 * Finish up. 719 */ 720 if (ronly) 721 pmp->pm_flags |= MSDOSFSMNT_RONLY; 722 else 723 pmp->pm_fmod = 1; 724 mp->mnt_data = pmp; 725 mp->mnt_stat.f_fsid.val[0] = (long)dev; 726 mp->mnt_stat.f_fsid.val[1] = makefstype(MOUNT_MSDOS); 727 mp->mnt_flag |= MNT_LOCAL; 728 mp->mnt_dev_bshift = pmp->pm_bnshift; 729 mp->mnt_fs_bshift = pmp->pm_cnshift; 730 731 #ifdef QUOTA 732 /* 733 * If we ever do quotas for DOS filesystems this would be a place 734 * to fill in the info in the msdosfsmount structure. You dolt, 735 * quotas on dos filesystems make no sense because files have no 736 * owners on dos filesystems. of course there is some empty space 737 * in the directory entry where we could put uid's and gid's. 738 */ 739 #endif 740 devvp->v_specmountpoint = mp; 741 742 return (0); 743 744 error_exit:; 745 if (bp) 746 brelse(bp); 747 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 748 (void) VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, p); 749 VOP_UNLOCK(devvp, 0); 750 if (pmp) { 751 if (pmp->pm_inusemap) 752 free(pmp->pm_inusemap, M_MSDOSFSFAT); 753 free(pmp, M_MSDOSFSMNT); 754 mp->mnt_data = NULL; 755 } 756 return (error); 757 } 758 759 int 760 msdosfs_start(mp, flags, p) 761 struct mount *mp; 762 int flags; 763 struct proc *p; 764 { 765 766 return (0); 767 } 768 769 /* 770 * Unmount the filesystem described by mp. 771 */ 772 int 773 msdosfs_unmount(mp, mntflags, p) 774 struct mount *mp; 775 int mntflags; 776 struct proc *p; 777 { 778 struct msdosfsmount *pmp; 779 int error, flags; 780 781 flags = 0; 782 if (mntflags & MNT_FORCE) 783 flags |= FORCECLOSE; 784 #ifdef QUOTA 785 #endif 786 if ((error = vflush(mp, NULLVP, flags)) != 0) 787 return (error); 788 pmp = VFSTOMSDOSFS(mp); 789 if (pmp->pm_devvp->v_type != VBAD) 790 pmp->pm_devvp->v_specmountpoint = NULL; 791 #ifdef MSDOSFS_DEBUG 792 { 793 struct vnode *vp = pmp->pm_devvp; 794 795 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 796 printf("flag %08x, usecount %d, writecount %ld, holdcnt %ld\n", 797 vp->v_flag, vp->v_usecount, vp->v_writecount, vp->v_holdcnt); 798 printf("id %lu, mount %p, op %p\n", 799 vp->v_id, vp->v_mount, vp->v_op); 800 printf("freef %p, freeb %p, mount %p\n", 801 vp->v_freelist.tqe_next, vp->v_freelist.tqe_prev, 802 vp->v_mount); 803 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %d, type %d\n", 804 vp->v_cleanblkhd.lh_first, 805 vp->v_dirtyblkhd.lh_first, 806 vp->v_numoutput, vp->v_type); 807 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 808 vp->v_socket, vp->v_tag, 809 ((u_int *)vp->v_data)[0], 810 ((u_int *)vp->v_data)[1]); 811 } 812 #endif 813 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY); 814 error = VOP_CLOSE(pmp->pm_devvp, 815 pmp->pm_flags & MSDOSFSMNT_RONLY ? FREAD : FREAD|FWRITE, NOCRED, p); 816 vput(pmp->pm_devvp); 817 free(pmp->pm_inusemap, M_MSDOSFSFAT); 818 free(pmp, M_MSDOSFSMNT); 819 mp->mnt_data = NULL; 820 mp->mnt_flag &= ~MNT_LOCAL; 821 return (error); 822 } 823 824 int 825 msdosfs_root(mp, vpp) 826 struct mount *mp; 827 struct vnode **vpp; 828 { 829 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 830 struct denode *ndep; 831 int error; 832 833 #ifdef MSDOSFS_DEBUG 834 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 835 #endif 836 if ((error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep)) != 0) 837 return (error); 838 *vpp = DETOV(ndep); 839 return (0); 840 } 841 842 int 843 msdosfs_quotactl(mp, cmds, uid, arg, p) 844 struct mount *mp; 845 int cmds; 846 uid_t uid; 847 caddr_t arg; 848 struct proc *p; 849 { 850 851 #ifdef QUOTA 852 return (EOPNOTSUPP); 853 #else 854 return (EOPNOTSUPP); 855 #endif 856 } 857 858 int 859 msdosfs_statfs(mp, sbp, p) 860 struct mount *mp; 861 struct statfs *sbp; 862 struct proc *p; 863 { 864 struct msdosfsmount *pmp; 865 866 pmp = VFSTOMSDOSFS(mp); 867 #ifdef COMPAT_09 868 sbp->f_type = 4; 869 #else 870 sbp->f_type = 0; 871 #endif 872 sbp->f_bsize = pmp->pm_bpcluster; 873 sbp->f_iosize = pmp->pm_bpcluster; 874 sbp->f_blocks = pmp->pm_nmbrofclusters; 875 sbp->f_bfree = pmp->pm_freeclustercount; 876 sbp->f_bavail = pmp->pm_freeclustercount; 877 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 878 sbp->f_ffree = 0; /* what to put in here? */ 879 if (sbp != &mp->mnt_stat) { 880 memcpy(sbp->f_mntonname, mp->mnt_stat.f_mntonname, MNAMELEN); 881 memcpy(sbp->f_mntfromname, mp->mnt_stat.f_mntfromname, MNAMELEN); 882 } 883 strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN); 884 return (0); 885 } 886 887 int 888 msdosfs_sync(mp, waitfor, cred, p) 889 struct mount *mp; 890 int waitfor; 891 struct ucred *cred; 892 struct proc *p; 893 { 894 struct vnode *vp, *nvp; 895 struct denode *dep; 896 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 897 int error, allerror = 0; 898 899 /* 900 * If we ever switch to not updating all of the fats all the time, 901 * this would be the place to update them from the first one. 902 */ 903 if (pmp->pm_fmod != 0) { 904 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 905 panic("msdosfs_sync: rofs mod"); 906 else { 907 /* update fats here */ 908 } 909 } 910 /* 911 * Write back each (modified) denode. 912 */ 913 simple_lock(&mntvnode_slock); 914 loop: 915 for (vp = mp->mnt_vnodelist.lh_first; vp != NULL; vp = nvp) { 916 /* 917 * If the vnode that we are about to sync is no longer 918 * assoicated with this mount point, start over. 919 */ 920 if (vp->v_mount != mp) 921 goto loop; 922 simple_lock(&vp->v_interlock); 923 nvp = vp->v_mntvnodes.le_next; 924 dep = VTODE(vp); 925 if (waitfor == MNT_LAZY || vp->v_type == VNON || 926 (((dep->de_flag & 927 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0) && 928 (LIST_EMPTY(&vp->v_dirtyblkhd) && 929 vp->v_uobj.uo_npages == 0))) { 930 simple_unlock(&vp->v_interlock); 931 continue; 932 } 933 simple_unlock(&mntvnode_slock); 934 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK); 935 if (error) { 936 simple_lock(&mntvnode_slock); 937 if (error == ENOENT) 938 goto loop; 939 continue; 940 } 941 if ((error = VOP_FSYNC(vp, cred, 942 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0, p)) != 0) 943 allerror = error; 944 vput(vp); 945 simple_lock(&mntvnode_slock); 946 } 947 simple_unlock(&mntvnode_slock); 948 /* 949 * Force stale file system control information to be flushed. 950 */ 951 if ((error = VOP_FSYNC(pmp->pm_devvp, cred, 952 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0, p)) != 0) 953 allerror = error; 954 #ifdef QUOTA 955 /* qsync(mp); */ 956 #endif 957 return (allerror); 958 } 959 960 int 961 msdosfs_fhtovp(mp, fhp, vpp) 962 struct mount *mp; 963 struct fid *fhp; 964 struct vnode **vpp; 965 { 966 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 967 struct defid *defhp = (struct defid *) fhp; 968 struct denode *dep; 969 int error; 970 971 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 972 if (error) { 973 *vpp = NULLVP; 974 return (error); 975 } 976 *vpp = DETOV(dep); 977 return (0); 978 } 979 980 int 981 msdosfs_checkexp(mp, nam, exflagsp, credanonp) 982 struct mount *mp; 983 struct mbuf *nam; 984 int *exflagsp; 985 struct ucred **credanonp; 986 { 987 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 988 struct netcred *np; 989 990 np = vfs_export_lookup(mp, &pmp->pm_export, nam); 991 if (np == NULL) 992 return (EACCES); 993 *exflagsp = np->netc_exflags; 994 *credanonp = &np->netc_anon; 995 return (0); 996 } 997 998 int 999 msdosfs_vptofh(vp, fhp) 1000 struct vnode *vp; 1001 struct fid *fhp; 1002 { 1003 struct denode *dep; 1004 struct defid *defhp; 1005 1006 dep = VTODE(vp); 1007 defhp = (struct defid *)fhp; 1008 defhp->defid_len = sizeof(struct defid); 1009 defhp->defid_dirclust = dep->de_dirclust; 1010 defhp->defid_dirofs = dep->de_diroffset; 1011 /* defhp->defid_gen = dep->de_gen; */ 1012 return (0); 1013 } 1014 1015 int 1016 msdosfs_vget(mp, ino, vpp) 1017 struct mount *mp; 1018 ino_t ino; 1019 struct vnode **vpp; 1020 { 1021 1022 return (EOPNOTSUPP); 1023 } 1024 1025 int 1026 msdosfs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) 1027 int *name; 1028 u_int namelen; 1029 void *oldp; 1030 size_t *oldlenp; 1031 void *newp; 1032 size_t newlen; 1033 struct proc *p; 1034 { 1035 return (EOPNOTSUPP); 1036 } 1037