msdosfs_vfsops.c revision 34698
1/* $Id: msdosfs_vfsops.c,v 1.30 1998/03/08 09:57:48 julian Exp $ */ 2/* $NetBSD: msdosfs_vfsops.c,v 1.51 1997/11/17 15:36:58 ws Exp $ */ 3 4/*- 5 * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. 6 * Copyright (C) 1994, 1995, 1997 TooLs GmbH. 7 * All rights reserved. 8 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by TooLs GmbH. 21 * 4. The name of TooLs GmbH may not be used to endorse or promote products 22 * derived from this software without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 27 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 29 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 30 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 31 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 32 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 33 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35/* 36 * Written by Paul Popelka (paulp@uts.amdahl.com) 37 * 38 * You can do anything you want with this software, just don't say you wrote 39 * it, and don't remove this notice. 40 * 41 * This software is provided "as is". 42 * 43 * The author supplies this software to be publicly redistributed on the 44 * understanding that the author is not responsible for the correct 45 * functioning of this software in any circumstances and is not liable for 46 * any damages caused by this software. 47 * 48 * October 1992 49 */ 50 51#include <sys/param.h> 52#include <sys/systm.h> 53#include <sys/namei.h> 54#include <sys/proc.h> 55#include <sys/kernel.h> 56#include <sys/vnode.h> 57#include <miscfs/specfs/specdev.h> /* XXX */ /* defines v_rdev */ 58#include <sys/mount.h> 59#include <sys/buf.h> 60#include <sys/fcntl.h> 61#include <sys/malloc.h> 62#include <sys/stat.h> /* defines ALLPERMS */ 63 64#include <msdosfs/bpb.h> 65#include <msdosfs/bootsect.h> 66#include <msdosfs/direntry.h> 67#include <msdosfs/denode.h> 68#include <msdosfs/msdosfsmount.h> 69#include <msdosfs/fat.h> 70 71MALLOC_DEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOSFS mount structure"); 72static MALLOC_DEFINE(M_MSDOSFSFAT, "MSDOSFS FAT", "MSDOSFS file allocation table"); 73 74static int update_mp __P((struct mount *mp, struct msdosfs_args *argp)); 75static int mountmsdosfs __P((struct vnode *devvp, struct mount *mp, 76 struct proc *p, struct msdosfs_args *argp)); 77static int msdosfs_fhtovp __P((struct mount *, struct fid *, 78 struct sockaddr *, struct vnode **, int *, 79 struct ucred **)); 80static int msdosfs_mount __P((struct mount *, char *, caddr_t, 81 struct nameidata *, struct proc *)); 82static int msdosfs_quotactl __P((struct mount *, int, uid_t, caddr_t, 83 struct proc *)); 84static int msdosfs_root __P((struct mount *, struct vnode **)); 85static int msdosfs_start __P((struct mount *, int, struct proc *)); 86static int msdosfs_statfs __P((struct mount *, struct statfs *, 87 struct proc *)); 88static int msdosfs_sync __P((struct mount *, int, struct ucred *, 89 struct proc *)); 90static int msdosfs_unmount __P((struct mount *, int, struct proc *)); 91static int msdosfs_vget __P((struct mount *mp, ino_t ino, 92 struct vnode **vpp)); 93static int msdosfs_vptofh __P((struct vnode *, struct fid *)); 94 95static int 96update_mp(mp, argp) 97 struct mount *mp; 98 struct msdosfs_args *argp; 99{ 100 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 101 int error; 102 103 pmp->pm_gid = argp->gid; 104 pmp->pm_uid = argp->uid; 105 pmp->pm_mask = argp->mask & ALLPERMS; 106 pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT; 107 if (pmp->pm_flags & MSDOSFSMNT_U2WTABLE) { 108 bcopy(argp->u2w, pmp->pm_u2w, sizeof(pmp->pm_u2w)); 109 bcopy(argp->d2u, pmp->pm_d2u, sizeof(pmp->pm_d2u)); 110 bcopy(argp->u2d, pmp->pm_u2d, sizeof(pmp->pm_u2d)); 111 } 112 if (pmp->pm_flags & MSDOSFSMNT_ULTABLE) { 113 bcopy(argp->ul, pmp->pm_ul, sizeof(pmp->pm_ul)); 114 bcopy(argp->lu, pmp->pm_lu, sizeof(pmp->pm_lu)); 115 } 116 117#ifndef __FreeBSD__ 118 /* 119 * GEMDOS knows nothing (yet) about win95 120 */ 121 if (pmp->pm_flags & MSDOSFSMNT_GEMDOSFS) 122 pmp->pm_flags |= MSDOSFSMNT_NOWIN95; 123#endif 124 125 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 126 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 127 else if (!(pmp->pm_flags & 128 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 129 struct vnode *rootvp; 130 131 /* 132 * Try to divine whether to support Win'95 long filenames 133 */ 134 if (FAT32(pmp)) 135 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 136 else { 137 if ((error = msdosfs_root(mp, &rootvp)) != 0) 138 return error; 139 pmp->pm_flags |= findwin95(VTODE(rootvp)) 140 ? MSDOSFSMNT_LONGNAME 141 : MSDOSFSMNT_SHORTNAME; 142 vput(rootvp); 143 } 144 } 145 return 0; 146} 147 148#ifndef __FreeBSD__ 149int 150msdosfs_mountroot() 151{ 152 register struct mount *mp; 153 struct proc *p = curproc; /* XXX */ 154 size_t size; 155 int error; 156 struct msdosfs_args args; 157 158 if (root_device->dv_class != DV_DISK) 159 return (ENODEV); 160 161 /* 162 * Get vnodes for swapdev and rootdev. 163 */ 164 if (bdevvp(rootdev, &rootvp)) 165 panic("msdosfs_mountroot: can't setup rootvp"); 166 167 mp = malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK); 168 bzero((char *)mp, (u_long)sizeof(struct mount)); 169 mp->mnt_op = &msdosfs_vfsops; 170 mp->mnt_flag = 0; 171 LIST_INIT(&mp->mnt_vnodelist); 172 173 args.flags = 0; 174 args.uid = 0; 175 args.gid = 0; 176 args.mask = 0777; 177 178 if ((error = mountmsdosfs(rootvp, mp, p, &args)) != 0) { 179 free(mp, M_MOUNT); 180 return (error); 181 } 182 183 if ((error = update_mp(mp, &args)) != 0) { 184 (void)msdosfs_unmount(mp, 0, p); 185 free(mp, M_MOUNT); 186 return (error); 187 } 188 189 if ((error = vfs_lock(mp)) != 0) { 190 (void)msdosfs_unmount(mp, 0, p); 191 free(mp, M_MOUNT); 192 return (error); 193 } 194 195 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 196 mp->mnt_vnodecovered = NULLVP; 197 (void) copystr("/", mp->mnt_stat.f_mntonname, MNAMELEN - 1, 198 &size); 199 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); 200 (void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 201 &size); 202 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 203 (void)msdosfs_statfs(mp, &mp->mnt_stat, p); 204 vfs_unlock(mp); 205 return (0); 206} 207#endif 208 209/* 210 * mp - path - addr in user space of mount point (ie /usr or whatever) 211 * data - addr in user space of mount params including the name of the block 212 * special file to treat as a filesystem. 213 */ 214static int 215msdosfs_mount(mp, path, data, ndp, p) 216 struct mount *mp; 217 char *path; 218 caddr_t data; 219 struct nameidata *ndp; 220 struct proc *p; 221{ 222 struct vnode *devvp; /* vnode for blk device to mount */ 223 struct msdosfs_args args; /* will hold data from mount request */ 224 /* msdosfs specific mount control block */ 225 struct msdosfsmount *pmp = NULL; 226 size_t size; 227 int error, flags; 228 mode_t accessmode; 229 230 error = copyin(data, (caddr_t)&args, sizeof(struct msdosfs_args)); 231 if (error) 232 return (error); 233 if (args.magic != MSDOSFS_ARGSMAGIC) { 234 printf("Old mount_msdosfs, flags=%d\n", args.flags); 235 args.flags = 0; 236 } 237 /* 238 * If updating, check whether changing from read-only to 239 * read/write; if there is no device name, that's all we do. 240 */ 241 if (mp->mnt_flag & MNT_UPDATE) { 242 pmp = VFSTOMSDOSFS(mp); 243 error = 0; 244 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_RDONLY)) { 245 flags = WRITECLOSE; 246 if (mp->mnt_flag & MNT_FORCE) 247 flags |= FORCECLOSE; 248 error = vflush(mp, NULLVP, flags); 249 } 250 if (!error && (mp->mnt_flag & MNT_RELOAD)) 251 /* not yet implemented */ 252 error = EOPNOTSUPP; 253 if (error) 254 return (error); 255 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_kern_flag & MNTK_WANTRDWR)) { 256 /* 257 * If upgrade to read-write by non-root, then verify 258 * that user has necessary permissions on the device. 259 */ 260 if (p->p_ucred->cr_uid != 0) { 261 devvp = pmp->pm_devvp; 262 vn_lock(devvp, LK_EXCLUSIVE, p); 263 error = VOP_ACCESS(devvp, VREAD | VWRITE, 264 p->p_ucred, p); 265 if (error) { 266 VOP_UNLOCK(devvp, 0, p); 267 return (error); 268 } 269 VOP_UNLOCK(devvp, 0, p); 270 } 271 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 272 } 273 if (args.fspec == 0) { 274#ifdef __notyet__ /* doesn't work correctly with current mountd XXX */ 275 if (args.flags & MSDOSFSMNT_MNTOPT) { 276 pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT; 277 pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT; 278 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 279 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 280 } 281#endif 282 /* 283 * Process export requests. 284 */ 285 return (vfs_export(mp, &pmp->pm_export, &args.export)); 286 } 287 } 288 /* 289 * Not an update, or updating the name: look up the name 290 * and verify that it refers to a sensible block device. 291 */ 292 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p); 293 error = namei(ndp); 294 if (error) 295 return (error); 296 devvp = ndp->ni_vp; 297 298 if (devvp->v_type != VBLK) { 299 vrele(devvp); 300 return (ENOTBLK); 301 } 302 if (major(devvp->v_rdev) >= nblkdev) { 303 vrele(devvp); 304 return (ENXIO); 305 } 306 /* 307 * If mount by non-root, then verify that user has necessary 308 * permissions on the device. 309 */ 310 if (p->p_ucred->cr_uid != 0) { 311 accessmode = VREAD; 312 if ((mp->mnt_flag & MNT_RDONLY) == 0) 313 accessmode |= VWRITE; 314 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p); 315 error = VOP_ACCESS(devvp, accessmode, p->p_ucred, p); 316 if (error) { 317 vput(devvp); 318 return (error); 319 } 320 VOP_UNLOCK(devvp, 0, p); 321 } 322 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 323 error = mountmsdosfs(devvp, mp, p, &args); 324#ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 325 pmp = VFSTOMSDOSFS(mp); 326#endif 327 } else { 328 if (devvp != pmp->pm_devvp) 329 error = EINVAL; /* XXX needs translation */ 330 else 331 vrele(devvp); 332 } 333 if (error) { 334 vrele(devvp); 335 return (error); 336 } 337 338 error = update_mp(mp, &args); 339 if (error) { 340 msdosfs_unmount(mp, MNT_FORCE, p); 341 return error; 342 } 343 344 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); 345 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); 346 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 347 &size); 348 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 349 (void) msdosfs_statfs(mp, &mp->mnt_stat, p); 350#ifdef MSDOSFS_DEBUG 351 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 352#endif 353 return (0); 354} 355 356static int 357mountmsdosfs(devvp, mp, p, argp) 358 struct vnode *devvp; 359 struct mount *mp; 360 struct proc *p; 361 struct msdosfs_args *argp; 362{ 363 struct msdosfsmount *pmp; 364 struct buf *bp; 365 dev_t dev = devvp->v_rdev; 366#ifndef __FreeBSD__ 367 struct partinfo dpart; 368#endif 369 union bootsector *bsp; 370 struct byte_bpb33 *b33; 371 struct byte_bpb50 *b50; 372 struct byte_bpb710 *b710; 373 u_int8_t SecPerClust; 374 int ronly, error; 375 int bsize = 0, dtype = 0, tmp; 376 377 /* 378 * Disallow multiple mounts of the same device. 379 * Disallow mounting of a device that is currently in use 380 * (except for root, which might share swap device for miniroot). 381 * Flush out any old buffers remaining from a previous use. 382 */ 383 error = vfs_mountedon(devvp); 384 if (error) 385 return (error); 386 if (vcount(devvp) > 1 && devvp != rootvp) 387 return (EBUSY); 388 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p); 389 error = vinvalbuf(devvp, V_SAVE, p->p_ucred, p, 0, 0); 390 VOP_UNLOCK(devvp, 0, p); 391 if (error) 392 return (error); 393 394 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 395 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p); 396 if (error) 397 return (error); 398 399 bp = NULL; /* both used in error_exit */ 400 pmp = NULL; 401 402#ifndef __FreeBSD__ 403 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 404 /* 405 * We need the disklabel to calculate the size of a FAT entry 406 * later on. Also make sure the partition contains a filesystem 407 * of type FS_MSDOS. This doesn't work for floppies, so we have 408 * to check for them too. 409 * 410 * At least some parts of the msdos fs driver seem to assume 411 * that the size of a disk block will always be 512 bytes. 412 * Let's check it... 413 */ 414 error = VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, 415 FREAD, NOCRED, p); 416 if (error) 417 goto error_exit; 418 tmp = dpart.part->p_fstype; 419 dtype = dpart.disklab->d_type; 420 bsize = dpart.disklab->d_secsize; 421 if (bsize != 512 || (dtype!=DTYPE_FLOPPY && tmp!=FS_MSDOS)) { 422 error = EINVAL; 423 goto error_exit; 424 } 425 } 426#endif 427 428 /* 429 * Read the boot sector of the filesystem, and then check the 430 * boot signature. If not a dos boot sector then error out. 431 */ 432#ifdef PC98 433 error = bread(devvp, 0, 1024, NOCRED, &bp); 434#else 435 error = bread(devvp, 0, 512, NOCRED, &bp); 436#endif 437 if (error) 438 goto error_exit; 439 bp->b_flags |= B_AGE; 440 bsp = (union bootsector *)bp->b_data; 441 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 442 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 443 b710 = (struct byte_bpb710 *)bsp->bs710.bsPBP; 444 445#ifndef __FreeBSD__ 446 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 447#endif 448#ifdef PC98 449 if ((bsp->bs50.bsBootSectSig0 != BOOTSIG0 450 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) 451 && (bsp->bs50.bsBootSectSig0 != 0 /* PC98 DOS 3.3x */ 452 || bsp->bs50.bsBootSectSig1 != 0) 453 && (bsp->bs50.bsBootSectSig0 != 0x90 /* PC98 DOS 5.0 */ 454 || bsp->bs50.bsBootSectSig1 != 0x3d) 455 && (bsp->bs50.bsBootSectSig0 != 0x46 /* PC98 DOS 3.3B */ 456 || bsp->bs50.bsBootSectSig1 != 0xfa)) { 457#else 458 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 459 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 460#endif 461 error = EINVAL; 462 goto error_exit; 463 } 464#ifndef __FreeBSD__ 465 } 466#endif 467 468 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK); 469 bzero((caddr_t)pmp, sizeof *pmp); 470 pmp->pm_mountp = mp; 471 472 /* 473 * Compute several useful quantities from the bpb in the 474 * bootsector. Copy in the dos 5 variant of the bpb then fix up 475 * the fields that are different between dos 5 and dos 3.3. 476 */ 477 SecPerClust = b50->bpbSecPerClust; 478 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 479 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 480 pmp->pm_FATs = b50->bpbFATs; 481 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 482 pmp->pm_Sectors = getushort(b50->bpbSectors); 483 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 484 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 485 pmp->pm_Heads = getushort(b50->bpbHeads); 486 pmp->pm_Media = b50->bpbMedia; 487 488#ifndef __FreeBSD__ 489 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 490#endif 491 /* XXX - We should probably check more values here */ 492 if (!pmp->pm_BytesPerSec || !SecPerClust 493 || !pmp->pm_Heads || pmp->pm_Heads > 255 494#ifdef PC98 495 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 255) { 496#else 497 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 63) { 498#endif 499 error = EINVAL; 500 goto error_exit; 501 } 502#ifndef __FreeBSD__ 503 } 504#endif 505 506 if (pmp->pm_Sectors == 0) { 507 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 508 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 509 } else { 510 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 511 pmp->pm_HugeSectors = pmp->pm_Sectors; 512 } 513 if (pmp->pm_HugeSectors > 0xffffffff / pmp->pm_BytesPerSec + 1) { 514 /* 515 * We cannot deal currently with this size of disk 516 * due to fileid limitations (see msdosfs_getattr and 517 * msdosfs_readdir) 518 */ 519 error = EINVAL; 520 goto error_exit; 521 } 522 523 if (pmp->pm_RootDirEnts == 0) { 524 if (bsp->bs710.bsBootSectSig2 != BOOTSIG2 525 || bsp->bs710.bsBootSectSig3 != BOOTSIG3 526 || pmp->pm_Sectors 527 || pmp->pm_FATsecs 528 || getushort(b710->bpbFSVers)) { 529 error = EINVAL; 530 goto error_exit; 531 } 532 pmp->pm_fatmask = FAT32_MASK; 533 pmp->pm_fatmult = 4; 534 pmp->pm_fatdiv = 1; 535 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 536 if (getushort(b710->bpbExtFlags) & FATMIRROR) 537 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 538 else 539 pmp->pm_flags |= MSDOSFS_FATMIRROR; 540 } else 541 pmp->pm_flags |= MSDOSFS_FATMIRROR; 542 543#ifndef __FreeBSD__ 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#endif 586 pmp->pm_fatblk = pmp->pm_ResSectors; 587 if (FAT32(pmp)) { 588 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 589 pmp->pm_firstcluster = pmp->pm_fatblk 590 + (pmp->pm_FATs * pmp->pm_FATsecs); 591 pmp->pm_fsinfo = getushort(b710->bpbFSInfo); 592 } else { 593 pmp->pm_rootdirblk = pmp->pm_fatblk + 594 (pmp->pm_FATs * pmp->pm_FATsecs); 595 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 596 + pmp->pm_BytesPerSec - 1) 597 / pmp->pm_BytesPerSec;/* in sectors */ 598 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 599 } 600 601 pmp->pm_nmbrofclusters = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 602 SecPerClust; 603 pmp->pm_maxcluster = pmp->pm_nmbrofclusters + 1; 604 pmp->pm_fatsize = pmp->pm_FATsecs * pmp->pm_BytesPerSec; 605 606#ifndef __FreeBSD__ 607 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 608 if ((pmp->pm_nmbrofclusters <= (0xff0 - 2)) 609 && ((dtype == DTYPE_FLOPPY) || ((dtype == DTYPE_VNODE) 610 && ((pmp->pm_Heads == 1) || (pmp->pm_Heads == 2)))) 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 } else 621#endif 622 if (pmp->pm_fatmask == 0) { 623 if (pmp->pm_maxcluster 624 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 625 /* 626 * This will usually be a floppy disk. This size makes 627 * sure that one fat entry will not be split across 628 * multiple blocks. 629 */ 630 pmp->pm_fatmask = FAT12_MASK; 631 pmp->pm_fatmult = 3; 632 pmp->pm_fatdiv = 2; 633 } else { 634 pmp->pm_fatmask = FAT16_MASK; 635 pmp->pm_fatmult = 2; 636 pmp->pm_fatdiv = 1; 637 } 638 } 639 if (FAT12(pmp)) 640 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 641 else 642 pmp->pm_fatblocksize = MAXBSIZE; 643 644 pmp->pm_fatblocksec = pmp->pm_fatblocksize / pmp->pm_BytesPerSec; 645 pmp->pm_bnshift = ffs(pmp->pm_BytesPerSec) - 1; 646 647 /* 648 * Compute mask and shift value for isolating cluster relative byte 649 * offsets and cluster numbers from a file offset. 650 */ 651 pmp->pm_bpcluster = SecPerClust * pmp->pm_BytesPerSec; 652 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 653 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 654 655 /* 656 * Check for valid cluster size 657 * must be a power of 2 658 */ 659 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 660 error = EINVAL; 661 goto error_exit; 662 } 663 664 /* 665 * Release the bootsector buffer. 666 */ 667 brelse(bp); 668 bp = NULL; 669 670 /* 671 * Check FSInfo. 672 */ 673 if (pmp->pm_fsinfo) { 674 struct fsinfo *fp; 675 676 if ((error = bread(devvp, pmp->pm_fsinfo, 1024, NOCRED, &bp)) != 0) 677 goto error_exit; 678 fp = (struct fsinfo *)bp->b_data; 679 if (!bcmp(fp->fsisig1, "RRaA", 4) 680 && !bcmp(fp->fsisig2, "rrAa", 4) 681 && !bcmp(fp->fsisig3, "\0\0\125\252", 4) 682 && !bcmp(fp->fsisig4, "\0\0\125\252", 4)) 683 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 684 else 685 pmp->pm_fsinfo = 0; 686 brelse(bp); 687 bp = NULL; 688 } 689 690 /* 691 * Check and validate (or perhaps invalidate?) the fsinfo structure? XXX 692 */ 693 694 /* 695 * Allocate memory for the bitmap of allocated clusters, and then 696 * fill it in. 697 */ 698 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 699 / N_INUSEBITS) 700 * sizeof(*pmp->pm_inusemap), 701 M_MSDOSFSFAT, M_WAITOK); 702 703 /* 704 * fillinusemap() needs pm_devvp. 705 */ 706 pmp->pm_dev = dev; 707 pmp->pm_devvp = devvp; 708 709 /* 710 * Have the inuse map filled in. 711 */ 712 if ((error = fillinusemap(pmp)) != 0) 713 goto error_exit; 714 715 /* 716 * If they want fat updates to be synchronous then let them suffer 717 * the performance degradation in exchange for the on disk copy of 718 * the fat being correct just about all the time. I suppose this 719 * would be a good thing to turn on if the kernel is still flakey. 720 */ 721 if (mp->mnt_flag & MNT_SYNCHRONOUS) 722 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 723 724 /* 725 * Finish up. 726 */ 727 if (ronly) 728 pmp->pm_flags |= MSDOSFSMNT_RONLY; 729 else 730 pmp->pm_fmod = 1; 731 mp->mnt_data = (qaddr_t) pmp; 732 mp->mnt_stat.f_fsid.val[0] = (long)dev; 733 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 734 mp->mnt_flag |= MNT_LOCAL; 735 devvp->v_specmountpoint = mp; 736 737 return 0; 738 739error_exit: 740 if (bp) 741 brelse(bp); 742 (void) VOP_CLOSE(devvp, ronly ? FREAD : FREAD | FWRITE, NOCRED, p); 743 if (pmp) { 744 if (pmp->pm_inusemap) 745 free(pmp->pm_inusemap, M_MSDOSFSFAT); 746 free(pmp, M_MSDOSFSMNT); 747 mp->mnt_data = (qaddr_t)0; 748 } 749 return (error); 750} 751 752static int 753msdosfs_start(mp, flags, p) 754 struct mount *mp; 755 int flags; 756 struct proc *p; 757{ 758 759 return (0); 760} 761 762/* 763 * Unmount the filesystem described by mp. 764 */ 765static int 766msdosfs_unmount(mp, mntflags, p) 767 struct mount *mp; 768 int mntflags; 769 struct proc *p; 770{ 771 struct msdosfsmount *pmp; 772 int error, flags; 773 774 flags = 0; 775 if (mntflags & MNT_FORCE) 776 flags |= FORCECLOSE; 777 error = vflush(mp, NULLVP, flags); 778 if (error) 779 return error; 780 pmp = VFSTOMSDOSFS(mp); 781 pmp->pm_devvp->v_specmountpoint = NULL; 782#ifdef MSDOSFS_DEBUG 783 { 784 struct vnode *vp = pmp->pm_devvp; 785 786 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 787 printf("flag %08lx, usecount %d, writecount %d, holdcnt %ld\n", 788 vp->v_flag, vp->v_usecount, vp->v_writecount, vp->v_holdcnt); 789 printf("lastr %d, id %lu, mount %p, op %p\n", 790 vp->v_lastr, vp->v_id, vp->v_mount, vp->v_op); 791 printf("freef %p, freeb %p, mount %p\n", 792 vp->v_freelist.tqe_next, vp->v_freelist.tqe_prev, 793 vp->v_mount); 794 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %ld, type %d\n", 795 vp->v_cleanblkhd.lh_first, 796 vp->v_dirtyblkhd.lh_first, 797 vp->v_numoutput, vp->v_type); 798 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 799 vp->v_socket, vp->v_tag, 800 ((u_int *)vp->v_data)[0], 801 ((u_int *)vp->v_data)[1]); 802 } 803#endif 804 error = VOP_CLOSE(pmp->pm_devvp, 805 (pmp->pm_flags&MSDOSFSMNT_RONLY) ? FREAD : FREAD | FWRITE, 806 NOCRED, p); 807 vrele(pmp->pm_devvp); 808 free(pmp->pm_inusemap, M_MSDOSFSFAT); 809 free(pmp, M_MSDOSFSMNT); 810 mp->mnt_data = (qaddr_t)0; 811 mp->mnt_flag &= ~MNT_LOCAL; 812 return (error); 813} 814 815static int 816msdosfs_root(mp, vpp) 817 struct mount *mp; 818 struct vnode **vpp; 819{ 820 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 821 struct denode *ndep; 822 int error; 823 824#ifdef MSDOSFS_DEBUG 825 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 826#endif 827 error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep); 828 if (error) 829 return (error); 830 *vpp = DETOV(ndep); 831 return (0); 832} 833 834static int 835msdosfs_quotactl(mp, cmds, uid, arg, p) 836 struct mount *mp; 837 int cmds; 838 uid_t uid; 839 caddr_t arg; 840 struct proc *p; 841{ 842 return EOPNOTSUPP; 843} 844 845static int 846msdosfs_statfs(mp, sbp, p) 847 struct mount *mp; 848 struct statfs *sbp; 849 struct proc *p; 850{ 851 struct msdosfsmount *pmp; 852 853 pmp = VFSTOMSDOSFS(mp); 854 sbp->f_bsize = pmp->pm_bpcluster; 855 sbp->f_iosize = pmp->pm_bpcluster; 856 sbp->f_blocks = pmp->pm_nmbrofclusters; 857 sbp->f_bfree = pmp->pm_freeclustercount; 858 sbp->f_bavail = pmp->pm_freeclustercount; 859 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 860 sbp->f_ffree = 0; /* what to put in here? */ 861 if (sbp != &mp->mnt_stat) { 862 sbp->f_type = mp->mnt_vfc->vfc_typenum; 863 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 864 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 865 } 866 strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN); 867 return (0); 868} 869 870static int 871msdosfs_sync(mp, waitfor, cred, p) 872 struct mount *mp; 873 int waitfor; 874 struct ucred *cred; 875 struct proc *p; 876{ 877 struct vnode *vp, *nvp; 878 struct denode *dep; 879 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 880 int error, allerror = 0; 881 882 /* 883 * If we ever switch to not updating all of the fats all the time, 884 * this would be the place to update them from the first one. 885 */ 886 if (pmp->pm_fmod != 0) 887 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 888 panic("msdosfs_sync: rofs mod"); 889 else { 890 /* update fats here */ 891 } 892 /* 893 * Write back each (modified) denode. 894 */ 895 simple_lock(&mntvnode_slock); 896loop: 897 for (vp = mp->mnt_vnodelist.lh_first; 898 vp != NULL; 899 vp = nvp) { 900 /* 901 * If the vnode that we are about to sync is no longer 902 * assoicated with this mount point, start over. 903 */ 904 if (vp->v_mount != mp) 905 goto loop; 906 907 simple_lock(&vp->v_interlock); 908 nvp = vp->v_mntvnodes.le_next; 909 dep = VTODE(vp); 910 if (vp->v_type == VNON 911 || (waitfor == MNT_LAZY) /* can this happen with msdosfs? */ 912 || (((dep->de_flag & 913 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0) 914 && (vp->v_dirtyblkhd.lh_first == NULL))) { 915 simple_unlock(&vp->v_interlock); 916 continue; 917 } 918 simple_unlock(&mntvnode_slock); 919 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, p); 920 if (error) { 921 simple_lock(&mntvnode_slock); 922 if (error == ENOENT) 923 goto loop; 924 continue; 925 } 926 error = VOP_FSYNC(vp, cred, waitfor, p); 927 if (error) 928 allerror = error; 929 VOP_UNLOCK(vp, 0, p); 930 vrele(vp); /* done with this one */ 931 simple_lock(&mntvnode_slock); 932 } 933 simple_unlock(&mntvnode_slock); 934 935 /* 936 * Flush filesystem control info. 937 */ 938 error = VOP_FSYNC(pmp->pm_devvp, cred, waitfor, p); 939 if (error) 940 allerror = error; 941 return (allerror); 942} 943 944static int 945msdosfs_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp) 946 struct mount *mp; 947 struct fid *fhp; 948 struct sockaddr *nam; 949 struct vnode **vpp; 950 int *exflagsp; 951 struct ucred **credanonp; 952{ 953 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 954 struct defid *defhp = (struct defid *) fhp; 955 struct denode *dep; 956 struct netcred *np; 957 int error; 958 959 np = vfs_export_lookup(mp, &pmp->pm_export, nam); 960 if (np == NULL) 961 return (EACCES); 962 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 963 if (error) { 964 *vpp = NULLVP; 965 return (error); 966 } 967 *vpp = DETOV(dep); 968 *exflagsp = np->netc_exflags; 969 *credanonp = &np->netc_anon; 970 return (0); 971} 972 973static int 974msdosfs_vptofh(vp, fhp) 975 struct vnode *vp; 976 struct fid *fhp; 977{ 978 struct denode *dep; 979 struct defid *defhp; 980 981 dep = VTODE(vp); 982 defhp = (struct defid *)fhp; 983 defhp->defid_len = sizeof(struct defid); 984 defhp->defid_dirclust = dep->de_dirclust; 985 defhp->defid_dirofs = dep->de_diroffset; 986 /* defhp->defid_gen = dep->de_gen; */ 987 return (0); 988} 989 990static int 991msdosfs_vget(mp, ino, vpp) 992 struct mount *mp; 993 ino_t ino; 994 struct vnode **vpp; 995{ 996 return EOPNOTSUPP; 997} 998 999static struct vfsops msdosfs_vfsops = { 1000 msdosfs_mount, 1001 msdosfs_start, 1002 msdosfs_unmount, 1003 msdosfs_root, 1004 msdosfs_quotactl, 1005 msdosfs_statfs, 1006 msdosfs_sync, 1007 msdosfs_vget, 1008 vfs_vrele, 1009 msdosfs_fhtovp, 1010 msdosfs_vptofh, 1011 msdosfs_init 1012}; 1013 1014VFS_SET(msdosfs_vfsops, msdos, MOUNT_MSDOS, 0); 1015