msdosfs_vfsops.c revision 45098
1/* $Id: msdosfs_vfsops.c,v 1.40 1999/01/27 22:42:09 dillon 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/conf.h> 54#include <sys/namei.h> 55#include <sys/proc.h> 56#include <sys/kernel.h> 57#include <sys/vnode.h> 58#include <miscfs/specfs/specdev.h> /* XXX */ /* defines v_rdev */ 59#include <sys/mount.h> 60#include <sys/buf.h> 61#include <sys/fcntl.h> 62#include <sys/malloc.h> 63#include <sys/stat.h> /* defines ALLPERMS */ 64 65#include <msdosfs/bpb.h> 66#include <msdosfs/bootsect.h> 67#include <msdosfs/direntry.h> 68#include <msdosfs/denode.h> 69#include <msdosfs/msdosfsmount.h> 70#include <msdosfs/fat.h> 71 72MALLOC_DEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOSFS mount structure"); 73static MALLOC_DEFINE(M_MSDOSFSFAT, "MSDOSFS FAT", "MSDOSFS file allocation table"); 74 75static int update_mp __P((struct mount *mp, struct msdosfs_args *argp)); 76static int mountmsdosfs __P((struct vnode *devvp, struct mount *mp, 77 struct proc *p, struct msdosfs_args *argp)); 78static int msdosfs_fhtovp __P((struct mount *, struct fid *, 79 struct sockaddr *, struct vnode **, int *, 80 struct ucred **)); 81static int msdosfs_mount __P((struct mount *, char *, caddr_t, 82 struct nameidata *, struct proc *)); 83static int msdosfs_quotactl __P((struct mount *, int, uid_t, caddr_t, 84 struct proc *)); 85static int msdosfs_root __P((struct mount *, struct vnode **)); 86static int msdosfs_start __P((struct mount *, int, struct proc *)); 87static int msdosfs_statfs __P((struct mount *, struct statfs *, 88 struct proc *)); 89static int msdosfs_sync __P((struct mount *, int, struct ucred *, 90 struct proc *)); 91static int msdosfs_unmount __P((struct mount *, int, struct proc *)); 92static int msdosfs_vget __P((struct mount *mp, ino_t ino, 93 struct vnode **vpp)); 94static int msdosfs_vptofh __P((struct vnode *, struct fid *)); 95 96static int 97update_mp(mp, argp) 98 struct mount *mp; 99 struct msdosfs_args *argp; 100{ 101 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 102 int error; 103 104 pmp->pm_gid = argp->gid; 105 pmp->pm_uid = argp->uid; 106 pmp->pm_mask = argp->mask & ALLPERMS; 107 pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT; 108 if (pmp->pm_flags & MSDOSFSMNT_U2WTABLE) { 109 bcopy(argp->u2w, pmp->pm_u2w, sizeof(pmp->pm_u2w)); 110 bcopy(argp->d2u, pmp->pm_d2u, sizeof(pmp->pm_d2u)); 111 bcopy(argp->u2d, pmp->pm_u2d, sizeof(pmp->pm_u2d)); 112 } 113 if (pmp->pm_flags & MSDOSFSMNT_ULTABLE) { 114 bcopy(argp->ul, pmp->pm_ul, sizeof(pmp->pm_ul)); 115 bcopy(argp->lu, pmp->pm_lu, sizeof(pmp->pm_lu)); 116 } 117 118#ifndef __FreeBSD__ 119 /* 120 * GEMDOS knows nothing (yet) about win95 121 */ 122 if (pmp->pm_flags & MSDOSFSMNT_GEMDOSFS) 123 pmp->pm_flags |= MSDOSFSMNT_NOWIN95; 124#endif 125 126 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 127 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 128 else if (!(pmp->pm_flags & 129 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 130 struct vnode *rootvp; 131 132 /* 133 * Try to divine whether to support Win'95 long filenames 134 */ 135 if (FAT32(pmp)) 136 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 137 else { 138 if ((error = msdosfs_root(mp, &rootvp)) != 0) 139 return error; 140 pmp->pm_flags |= findwin95(VTODE(rootvp)) 141 ? MSDOSFSMNT_LONGNAME 142 : MSDOSFSMNT_SHORTNAME; 143 vput(rootvp); 144 } 145 } 146 return 0; 147} 148 149#ifndef __FreeBSD__ 150int 151msdosfs_mountroot() 152{ 153 register struct mount *mp; 154 struct proc *p = curproc; /* XXX */ 155 size_t size; 156 int error; 157 struct msdosfs_args args; 158 159 if (root_device->dv_class != DV_DISK) 160 return (ENODEV); 161 162 /* 163 * Get vnodes for swapdev and rootdev. 164 */ 165 if (bdevvp(rootdev, &rootvp)) 166 panic("msdosfs_mountroot: can't setup rootvp"); 167 168 mp = malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK); 169 bzero((char *)mp, (u_long)sizeof(struct mount)); 170 mp->mnt_op = &msdosfs_vfsops; 171 mp->mnt_flag = 0; 172 LIST_INIT(&mp->mnt_vnodelist); 173 174 args.flags = 0; 175 args.uid = 0; 176 args.gid = 0; 177 args.mask = 0777; 178 179 if ((error = mountmsdosfs(rootvp, mp, p, &args)) != 0) { 180 free(mp, M_MOUNT); 181 return (error); 182 } 183 184 if ((error = update_mp(mp, &args)) != 0) { 185 (void)msdosfs_unmount(mp, 0, p); 186 free(mp, M_MOUNT); 187 return (error); 188 } 189 190 if ((error = vfs_lock(mp)) != 0) { 191 (void)msdosfs_unmount(mp, 0, p); 192 free(mp, M_MOUNT); 193 return (error); 194 } 195 196 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 197 mp->mnt_vnodecovered = NULLVP; 198 (void) copystr("/", mp->mnt_stat.f_mntonname, MNAMELEN - 1, 199 &size); 200 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); 201 (void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 202 &size); 203 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 204 (void)msdosfs_statfs(mp, &mp->mnt_stat, p); 205 vfs_unlock(mp); 206 return (0); 207} 208#endif 209 210/* 211 * mp - path - addr in user space of mount point (ie /usr or whatever) 212 * data - addr in user space of mount params including the name of the block 213 * special file to treat as a filesystem. 214 */ 215static int 216msdosfs_mount(mp, path, data, ndp, p) 217 struct mount *mp; 218 char *path; 219 caddr_t data; 220 struct nameidata *ndp; 221 struct proc *p; 222{ 223 struct vnode *devvp; /* vnode for blk device to mount */ 224 struct msdosfs_args args; /* will hold data from mount request */ 225 /* msdosfs specific mount control block */ 226 struct msdosfsmount *pmp = NULL; 227 size_t size; 228 int error, flags; 229 mode_t accessmode; 230 231 error = copyin(data, (caddr_t)&args, sizeof(struct msdosfs_args)); 232 if (error) 233 return (error); 234 if (args.magic != MSDOSFS_ARGSMAGIC) 235 args.flags = 0; 236 /* 237 * If updating, check whether changing from read-only to 238 * read/write; if there is no device name, that's all we do. 239 */ 240 if (mp->mnt_flag & MNT_UPDATE) { 241 pmp = VFSTOMSDOSFS(mp); 242 error = 0; 243 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_RDONLY)) { 244 flags = WRITECLOSE; 245 if (mp->mnt_flag & MNT_FORCE) 246 flags |= FORCECLOSE; 247 error = vflush(mp, NULLVP, flags); 248 } 249 if (!error && (mp->mnt_flag & MNT_RELOAD)) 250 /* not yet implemented */ 251 error = EOPNOTSUPP; 252 if (error) 253 return (error); 254 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_kern_flag & MNTK_WANTRDWR)) { 255 /* 256 * If upgrade to read-write by non-root, then verify 257 * that user has necessary permissions on the device. 258 */ 259 if (p->p_ucred->cr_uid != 0) { 260 devvp = pmp->pm_devvp; 261 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p); 262 error = VOP_ACCESS(devvp, VREAD | VWRITE, 263 p->p_ucred, p); 264 if (error) { 265 VOP_UNLOCK(devvp, 0, p); 266 return (error); 267 } 268 VOP_UNLOCK(devvp, 0, p); 269 } 270 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 271 } 272 if (args.fspec == 0) { 273#ifdef __notyet__ /* doesn't work correctly with current mountd XXX */ 274 if (args.flags & MSDOSFSMNT_MNTOPT) { 275 pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT; 276 pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT; 277 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 278 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 279 } 280#endif 281 /* 282 * Process export requests. 283 */ 284 return (vfs_export(mp, &pmp->pm_export, &args.export)); 285 } 286 } 287 /* 288 * Not an update, or updating the name: look up the name 289 * and verify that it refers to a sensible block device. 290 */ 291 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p); 292 error = namei(ndp); 293 if (error) 294 return (error); 295 devvp = ndp->ni_vp; 296 297 if (devvp->v_type != VBLK) { 298 vrele(devvp); 299 return (ENOTBLK); 300 } 301 if (major(devvp->v_rdev) >= nblkdev || 302 bdevsw[major(devvp->v_rdev)] == NULL) { 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 int bsize = 0, dtype = 0, tmp; 369#endif 370 union bootsector *bsp; 371 struct byte_bpb33 *b33; 372 struct byte_bpb50 *b50; 373 struct byte_bpb710 *b710; 374 u_int8_t SecPerClust; 375 int ronly, error; 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 / 514 (pmp->pm_BytesPerSec / sizeof(struct direntry)) + 1) { 515 /* 516 * We cannot deal currently with this size of disk 517 * due to fileid limitations (see msdosfs_getattr and 518 * msdosfs_readdir) 519 */ 520 error = EINVAL; 521 printf("mountmsdosfs(): disk too big, sorry\n"); 522 goto error_exit; 523 } 524 525 if (pmp->pm_RootDirEnts == 0) { 526 if (bsp->bs710.bsBootSectSig2 != BOOTSIG2 527 || bsp->bs710.bsBootSectSig3 != BOOTSIG3 528 || pmp->pm_Sectors 529 || pmp->pm_FATsecs 530 || getushort(b710->bpbFSVers)) { 531 error = EINVAL; 532 printf("mountmsdosfs(): bad FAT32 filesystem\n"); 533 goto error_exit; 534 } 535 pmp->pm_fatmask = FAT32_MASK; 536 pmp->pm_fatmult = 4; 537 pmp->pm_fatdiv = 1; 538 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 539 if (getushort(b710->bpbExtFlags) & FATMIRROR) 540 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 541 else 542 pmp->pm_flags |= MSDOSFS_FATMIRROR; 543 } else 544 pmp->pm_flags |= MSDOSFS_FATMIRROR; 545 546#ifndef __FreeBSD__ 547 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 548 if (FAT32(pmp)) { 549 /* 550 * GEMDOS doesn't know fat32. 551 */ 552 error = EINVAL; 553 goto error_exit; 554 } 555 556 /* 557 * Check a few values (could do some more): 558 * - logical sector size: power of 2, >= block size 559 * - sectors per cluster: power of 2, >= 1 560 * - number of sectors: >= 1, <= size of partition 561 */ 562 if ( (SecPerClust == 0) 563 || (SecPerClust & (SecPerClust - 1)) 564 || (pmp->pm_BytesPerSec < bsize) 565 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 566 || (pmp->pm_HugeSectors == 0) 567 || (pmp->pm_HugeSectors * (pmp->pm_BytesPerSec / bsize) 568 > dpart.part->p_size) 569 ) { 570 error = EINVAL; 571 goto error_exit; 572 } 573 /* 574 * XXX - Many parts of the msdos fs driver seem to assume that 575 * the number of bytes per logical sector (BytesPerSec) will 576 * always be the same as the number of bytes per disk block 577 * Let's pretend it is. 578 */ 579 tmp = pmp->pm_BytesPerSec / bsize; 580 pmp->pm_BytesPerSec = bsize; 581 pmp->pm_HugeSectors *= tmp; 582 pmp->pm_HiddenSects *= tmp; 583 pmp->pm_ResSectors *= tmp; 584 pmp->pm_Sectors *= tmp; 585 pmp->pm_FATsecs *= tmp; 586 SecPerClust *= tmp; 587 } 588#endif 589 pmp->pm_fatblk = pmp->pm_ResSectors; 590 if (FAT32(pmp)) { 591 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 592 pmp->pm_firstcluster = pmp->pm_fatblk 593 + (pmp->pm_FATs * pmp->pm_FATsecs); 594 pmp->pm_fsinfo = getushort(b710->bpbFSInfo); 595 } else { 596 pmp->pm_rootdirblk = pmp->pm_fatblk + 597 (pmp->pm_FATs * pmp->pm_FATsecs); 598 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 599 + pmp->pm_BytesPerSec - 1) 600 / pmp->pm_BytesPerSec;/* in sectors */ 601 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 602 } 603 604 pmp->pm_nmbrofclusters = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 605 SecPerClust; 606 pmp->pm_maxcluster = pmp->pm_nmbrofclusters + 1; 607 pmp->pm_fatsize = pmp->pm_FATsecs * pmp->pm_BytesPerSec; 608 609#ifndef __FreeBSD__ 610 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 611 if ((pmp->pm_nmbrofclusters <= (0xff0 - 2)) 612 && ((dtype == DTYPE_FLOPPY) || ((dtype == DTYPE_VNODE) 613 && ((pmp->pm_Heads == 1) || (pmp->pm_Heads == 2)))) 614 ) { 615 pmp->pm_fatmask = FAT12_MASK; 616 pmp->pm_fatmult = 3; 617 pmp->pm_fatdiv = 2; 618 } else { 619 pmp->pm_fatmask = FAT16_MASK; 620 pmp->pm_fatmult = 2; 621 pmp->pm_fatdiv = 1; 622 } 623 } else 624#endif 625 if (pmp->pm_fatmask == 0) { 626 if (pmp->pm_maxcluster 627 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 628 /* 629 * This will usually be a floppy disk. This size makes 630 * sure that one fat entry will not be split across 631 * multiple blocks. 632 */ 633 pmp->pm_fatmask = FAT12_MASK; 634 pmp->pm_fatmult = 3; 635 pmp->pm_fatdiv = 2; 636 } else { 637 pmp->pm_fatmask = FAT16_MASK; 638 pmp->pm_fatmult = 2; 639 pmp->pm_fatdiv = 1; 640 } 641 } 642 if (FAT12(pmp)) 643 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 644 else 645 pmp->pm_fatblocksize = DFLTBSIZE; 646 647 pmp->pm_fatblocksec = pmp->pm_fatblocksize / pmp->pm_BytesPerSec; 648 pmp->pm_bnshift = ffs(pmp->pm_BytesPerSec) - 1; 649 650 /* 651 * Compute mask and shift value for isolating cluster relative byte 652 * offsets and cluster numbers from a file offset. 653 */ 654 pmp->pm_bpcluster = SecPerClust * pmp->pm_BytesPerSec; 655 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 656 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 657 658 /* 659 * Check for valid cluster size 660 * must be a power of 2 661 */ 662 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 663 error = EINVAL; 664 goto error_exit; 665 } 666 667 /* 668 * Release the bootsector buffer. 669 */ 670 brelse(bp); 671 bp = NULL; 672 673 /* 674 * Check FSInfo. 675 */ 676 if (pmp->pm_fsinfo) { 677 struct fsinfo *fp; 678 679 if ((error = bread(devvp, pmp->pm_fsinfo, 1024, NOCRED, &bp)) != 0) 680 goto error_exit; 681 fp = (struct fsinfo *)bp->b_data; 682 if (!bcmp(fp->fsisig1, "RRaA", 4) 683 && !bcmp(fp->fsisig2, "rrAa", 4) 684 && !bcmp(fp->fsisig3, "\0\0\125\252", 4) 685 && !bcmp(fp->fsisig4, "\0\0\125\252", 4)) 686 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 687 else 688 pmp->pm_fsinfo = 0; 689 brelse(bp); 690 bp = NULL; 691 } 692 693 /* 694 * Check and validate (or perhaps invalidate?) the fsinfo structure? XXX 695 */ 696 697 /* 698 * Allocate memory for the bitmap of allocated clusters, and then 699 * fill it in. 700 */ 701 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 702 / N_INUSEBITS) 703 * sizeof(*pmp->pm_inusemap), 704 M_MSDOSFSFAT, M_WAITOK); 705 706 /* 707 * fillinusemap() needs pm_devvp. 708 */ 709 pmp->pm_dev = dev; 710 pmp->pm_devvp = devvp; 711 712 /* 713 * Have the inuse map filled in. 714 */ 715 if ((error = fillinusemap(pmp)) != 0) 716 goto error_exit; 717 718 /* 719 * If they want fat updates to be synchronous then let them suffer 720 * the performance degradation in exchange for the on disk copy of 721 * the fat being correct just about all the time. I suppose this 722 * would be a good thing to turn on if the kernel is still flakey. 723 */ 724 if (mp->mnt_flag & MNT_SYNCHRONOUS) 725 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 726 727 /* 728 * Finish up. 729 */ 730 if (ronly) 731 pmp->pm_flags |= MSDOSFSMNT_RONLY; 732 else 733 pmp->pm_fmod = 1; 734 mp->mnt_data = (qaddr_t) pmp; 735 mp->mnt_stat.f_fsid.val[0] = (long)dev; 736 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 737 mp->mnt_flag |= MNT_LOCAL; 738 devvp->v_specmountpoint = mp; 739 740 return 0; 741 742error_exit: 743 if (bp) 744 brelse(bp); 745 (void) VOP_CLOSE(devvp, ronly ? FREAD : FREAD | FWRITE, NOCRED, p); 746 if (pmp) { 747 if (pmp->pm_inusemap) 748 free(pmp->pm_inusemap, M_MSDOSFSFAT); 749 free(pmp, M_MSDOSFSMNT); 750 mp->mnt_data = (qaddr_t)0; 751 } 752 return (error); 753} 754 755static int 756msdosfs_start(mp, flags, p) 757 struct mount *mp; 758 int flags; 759 struct proc *p; 760{ 761 762 return (0); 763} 764 765/* 766 * Unmount the filesystem described by mp. 767 */ 768static int 769msdosfs_unmount(mp, mntflags, p) 770 struct mount *mp; 771 int mntflags; 772 struct proc *p; 773{ 774 struct msdosfsmount *pmp; 775 int error, flags; 776 777 flags = 0; 778 if (mntflags & MNT_FORCE) 779 flags |= FORCECLOSE; 780 error = vflush(mp, NULLVP, flags); 781 if (error) 782 return error; 783 pmp = VFSTOMSDOSFS(mp); 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 %08lx, usecount %d, writecount %d, holdcnt %ld\n", 791 vp->v_flag, vp->v_usecount, vp->v_writecount, vp->v_holdcnt); 792 printf("lastr %d, id %lu, mount %p, op %p\n", 793 vp->v_lastr, 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 %ld, type %d\n", 798 TAILQ_FIRST(&vp->v_cleanblkhd), 799 TAILQ_FIRST(&vp->v_dirtyblkhd), 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 error = VOP_CLOSE(pmp->pm_devvp, 808 (pmp->pm_flags&MSDOSFSMNT_RONLY) ? FREAD : FREAD | FWRITE, 809 NOCRED, p); 810 vrele(pmp->pm_devvp); 811 free(pmp->pm_inusemap, M_MSDOSFSFAT); 812 free(pmp, M_MSDOSFSMNT); 813 mp->mnt_data = (qaddr_t)0; 814 mp->mnt_flag &= ~MNT_LOCAL; 815 return (error); 816} 817 818static int 819msdosfs_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 error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep); 831 if (error) 832 return (error); 833 *vpp = DETOV(ndep); 834 return (0); 835} 836 837static int 838msdosfs_quotactl(mp, cmds, uid, arg, p) 839 struct mount *mp; 840 int cmds; 841 uid_t uid; 842 caddr_t arg; 843 struct proc *p; 844{ 845 return EOPNOTSUPP; 846} 847 848static int 849msdosfs_statfs(mp, sbp, p) 850 struct mount *mp; 851 struct statfs *sbp; 852 struct proc *p; 853{ 854 struct msdosfsmount *pmp; 855 856 pmp = VFSTOMSDOSFS(mp); 857 sbp->f_bsize = pmp->pm_bpcluster; 858 sbp->f_iosize = pmp->pm_bpcluster; 859 sbp->f_blocks = pmp->pm_nmbrofclusters; 860 sbp->f_bfree = pmp->pm_freeclustercount; 861 sbp->f_bavail = pmp->pm_freeclustercount; 862 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 863 sbp->f_ffree = 0; /* what to put in here? */ 864 if (sbp != &mp->mnt_stat) { 865 sbp->f_type = mp->mnt_vfc->vfc_typenum; 866 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 867 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 868 } 869 strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN); 870 return (0); 871} 872 873static int 874msdosfs_sync(mp, waitfor, cred, p) 875 struct mount *mp; 876 int waitfor; 877 struct ucred *cred; 878 struct proc *p; 879{ 880 struct vnode *vp, *nvp; 881 struct denode *dep; 882 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 883 int error, allerror = 0; 884 885 /* 886 * If we ever switch to not updating all of the fats all the time, 887 * this would be the place to update them from the first one. 888 */ 889 if (pmp->pm_fmod != 0) 890 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 891 panic("msdosfs_sync: rofs mod"); 892 else { 893 /* update fats here */ 894 } 895 /* 896 * Write back each (modified) denode. 897 */ 898 simple_lock(&mntvnode_slock); 899loop: 900 for (vp = mp->mnt_vnodelist.lh_first; vp != NULL; vp = nvp) { 901 /* 902 * If the vnode that we are about to sync is no longer 903 * associated with this mount point, start over. 904 */ 905 if (vp->v_mount != mp) 906 goto loop; 907 908 simple_lock(&vp->v_interlock); 909 nvp = vp->v_mntvnodes.le_next; 910 dep = VTODE(vp); 911 if (vp->v_type == VNON || 912 ((dep->de_flag & 913 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 && 914 (TAILQ_EMPTY(&vp->v_dirtyblkhd) || waitfor == MNT_LAZY))) { 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); 931 simple_lock(&mntvnode_slock); 932 } 933 simple_unlock(&mntvnode_slock); 934 935 /* 936 * Flush filesystem control info. 937 */ 938 if (waitfor != MNT_LAZY) { 939 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY, p); 940 error = VOP_FSYNC(pmp->pm_devvp, cred, waitfor, p); 941 if (error) 942 allerror = error; 943 VOP_UNLOCK(pmp->pm_devvp, 0, p); 944 } 945 return (allerror); 946} 947 948static int 949msdosfs_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp) 950 struct mount *mp; 951 struct fid *fhp; 952 struct sockaddr *nam; 953 struct vnode **vpp; 954 int *exflagsp; 955 struct ucred **credanonp; 956{ 957 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 958 struct defid *defhp = (struct defid *) fhp; 959 struct denode *dep; 960 struct netcred *np; 961 int error; 962 963 np = vfs_export_lookup(mp, &pmp->pm_export, nam); 964 if (np == NULL) 965 return (EACCES); 966 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 967 if (error) { 968 *vpp = NULLVP; 969 return (error); 970 } 971 *vpp = DETOV(dep); 972 *exflagsp = np->netc_exflags; 973 *credanonp = &np->netc_anon; 974 return (0); 975} 976 977static int 978msdosfs_vptofh(vp, fhp) 979 struct vnode *vp; 980 struct fid *fhp; 981{ 982 struct denode *dep; 983 struct defid *defhp; 984 985 dep = VTODE(vp); 986 defhp = (struct defid *)fhp; 987 defhp->defid_len = sizeof(struct defid); 988 defhp->defid_dirclust = dep->de_dirclust; 989 defhp->defid_dirofs = dep->de_diroffset; 990 /* defhp->defid_gen = dep->de_gen; */ 991 return (0); 992} 993 994static int 995msdosfs_vget(mp, ino, vpp) 996 struct mount *mp; 997 ino_t ino; 998 struct vnode **vpp; 999{ 1000 return EOPNOTSUPP; 1001} 1002 1003static struct vfsops msdosfs_vfsops = { 1004 msdosfs_mount, 1005 msdosfs_start, 1006 msdosfs_unmount, 1007 msdosfs_root, 1008 msdosfs_quotactl, 1009 msdosfs_statfs, 1010 msdosfs_sync, 1011 msdosfs_vget, 1012 msdosfs_fhtovp, 1013 msdosfs_vptofh, 1014 msdosfs_init 1015}; 1016 1017VFS_SET(msdosfs_vfsops, msdos, 0); 1018