msdosfs_vfsops.c revision 35046
1/* $Id: msdosfs_vfsops.c,v 1.31 1998/03/20 02:33:40 kato 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 printf("mountmsdosfs(): bad signature\n"); 463 goto error_exit; 464 } 465#ifndef __FreeBSD__ 466 } 467#endif 468 469 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK); 470 bzero((caddr_t)pmp, sizeof *pmp); 471 pmp->pm_mountp = mp; 472 473 /* 474 * Compute several useful quantities from the bpb in the 475 * bootsector. Copy in the dos 5 variant of the bpb then fix up 476 * the fields that are different between dos 5 and dos 3.3. 477 */ 478 SecPerClust = b50->bpbSecPerClust; 479 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 480 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 481 pmp->pm_FATs = b50->bpbFATs; 482 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 483 pmp->pm_Sectors = getushort(b50->bpbSectors); 484 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 485 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 486 pmp->pm_Heads = getushort(b50->bpbHeads); 487 pmp->pm_Media = b50->bpbMedia; 488 489#ifndef __FreeBSD__ 490 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 491#endif 492 /* XXX - We should probably check more values here */ 493 if (!pmp->pm_BytesPerSec || !SecPerClust 494 || !pmp->pm_Heads || pmp->pm_Heads > 255 495#ifdef PC98 496 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 255) { 497#else 498 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 63) { 499#endif 500 error = EINVAL; 501 printf("mountmsdosfs(): bad bpb\n"); 502 goto error_exit; 503 } 504#ifndef __FreeBSD__ 505 } 506#endif 507 508 if (pmp->pm_Sectors == 0) { 509 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 510 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 511 } else { 512 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 513 pmp->pm_HugeSectors = pmp->pm_Sectors; 514 } 515 if (pmp->pm_HugeSectors > 0xffffffff / pmp->pm_BytesPerSec + 1) { 516 /* 517 * We cannot deal currently with this size of disk 518 * due to fileid limitations (see msdosfs_getattr and 519 * msdosfs_readdir) 520 */ 521 error = EINVAL; 522 printf("mountmsdosfs(): disk too big, sorry\n"); 523 goto error_exit; 524 } 525 526 if (pmp->pm_RootDirEnts == 0) { 527 if (bsp->bs710.bsBootSectSig2 != BOOTSIG2 528 || bsp->bs710.bsBootSectSig3 != BOOTSIG3 529 || pmp->pm_Sectors 530 || pmp->pm_FATsecs 531 || getushort(b710->bpbFSVers)) { 532 error = EINVAL; 533 printf("mountmsdosfs(): bad FAT32 filesystem\n"); 534 goto error_exit; 535 } 536 pmp->pm_fatmask = FAT32_MASK; 537 pmp->pm_fatmult = 4; 538 pmp->pm_fatdiv = 1; 539 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 540 if (getushort(b710->bpbExtFlags) & FATMIRROR) 541 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 542 else 543 pmp->pm_flags |= MSDOSFS_FATMIRROR; 544 } else 545 pmp->pm_flags |= MSDOSFS_FATMIRROR; 546 547#ifndef __FreeBSD__ 548 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 549 if (FAT32(pmp)) { 550 /* 551 * GEMDOS doesn't know fat32. 552 */ 553 error = EINVAL; 554 goto error_exit; 555 } 556 557 /* 558 * Check a few values (could do some more): 559 * - logical sector size: power of 2, >= block size 560 * - sectors per cluster: power of 2, >= 1 561 * - number of sectors: >= 1, <= size of partition 562 */ 563 if ( (SecPerClust == 0) 564 || (SecPerClust & (SecPerClust - 1)) 565 || (pmp->pm_BytesPerSec < bsize) 566 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 567 || (pmp->pm_HugeSectors == 0) 568 || (pmp->pm_HugeSectors * (pmp->pm_BytesPerSec / bsize) 569 > dpart.part->p_size) 570 ) { 571 error = EINVAL; 572 goto error_exit; 573 } 574 /* 575 * XXX - Many parts of the msdos fs driver seem to assume that 576 * the number of bytes per logical sector (BytesPerSec) will 577 * always be the same as the number of bytes per disk block 578 * Let's pretend it is. 579 */ 580 tmp = pmp->pm_BytesPerSec / bsize; 581 pmp->pm_BytesPerSec = bsize; 582 pmp->pm_HugeSectors *= tmp; 583 pmp->pm_HiddenSects *= tmp; 584 pmp->pm_ResSectors *= tmp; 585 pmp->pm_Sectors *= tmp; 586 pmp->pm_FATsecs *= tmp; 587 SecPerClust *= tmp; 588 } 589#endif 590 pmp->pm_fatblk = pmp->pm_ResSectors; 591 if (FAT32(pmp)) { 592 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 593 pmp->pm_firstcluster = pmp->pm_fatblk 594 + (pmp->pm_FATs * pmp->pm_FATsecs); 595 pmp->pm_fsinfo = getushort(b710->bpbFSInfo); 596 } else { 597 pmp->pm_rootdirblk = pmp->pm_fatblk + 598 (pmp->pm_FATs * pmp->pm_FATsecs); 599 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 600 + pmp->pm_BytesPerSec - 1) 601 / pmp->pm_BytesPerSec;/* in sectors */ 602 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 603 } 604 605 pmp->pm_nmbrofclusters = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 606 SecPerClust; 607 pmp->pm_maxcluster = pmp->pm_nmbrofclusters + 1; 608 pmp->pm_fatsize = pmp->pm_FATsecs * pmp->pm_BytesPerSec; 609 610#ifndef __FreeBSD__ 611 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 612 if ((pmp->pm_nmbrofclusters <= (0xff0 - 2)) 613 && ((dtype == DTYPE_FLOPPY) || ((dtype == DTYPE_VNODE) 614 && ((pmp->pm_Heads == 1) || (pmp->pm_Heads == 2)))) 615 ) { 616 pmp->pm_fatmask = FAT12_MASK; 617 pmp->pm_fatmult = 3; 618 pmp->pm_fatdiv = 2; 619 } else { 620 pmp->pm_fatmask = FAT16_MASK; 621 pmp->pm_fatmult = 2; 622 pmp->pm_fatdiv = 1; 623 } 624 } else 625#endif 626 if (pmp->pm_fatmask == 0) { 627 if (pmp->pm_maxcluster 628 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 629 /* 630 * This will usually be a floppy disk. This size makes 631 * sure that one fat entry will not be split across 632 * multiple blocks. 633 */ 634 pmp->pm_fatmask = FAT12_MASK; 635 pmp->pm_fatmult = 3; 636 pmp->pm_fatdiv = 2; 637 } else { 638 pmp->pm_fatmask = FAT16_MASK; 639 pmp->pm_fatmult = 2; 640 pmp->pm_fatdiv = 1; 641 } 642 } 643 if (FAT12(pmp)) 644 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 645 else 646 pmp->pm_fatblocksize = MAXBSIZE; 647 648 pmp->pm_fatblocksec = pmp->pm_fatblocksize / pmp->pm_BytesPerSec; 649 pmp->pm_bnshift = ffs(pmp->pm_BytesPerSec) - 1; 650 651 /* 652 * Compute mask and shift value for isolating cluster relative byte 653 * offsets and cluster numbers from a file offset. 654 */ 655 pmp->pm_bpcluster = SecPerClust * pmp->pm_BytesPerSec; 656 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 657 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 658 659 /* 660 * Check for valid cluster size 661 * must be a power of 2 662 */ 663 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 664 error = EINVAL; 665 goto error_exit; 666 } 667 668 /* 669 * Release the bootsector buffer. 670 */ 671 brelse(bp); 672 bp = NULL; 673 674 /* 675 * Check FSInfo. 676 */ 677 if (pmp->pm_fsinfo) { 678 struct fsinfo *fp; 679 680 if ((error = bread(devvp, pmp->pm_fsinfo, 1024, NOCRED, &bp)) != 0) 681 goto error_exit; 682 fp = (struct fsinfo *)bp->b_data; 683 if (!bcmp(fp->fsisig1, "RRaA", 4) 684 && !bcmp(fp->fsisig2, "rrAa", 4) 685 && !bcmp(fp->fsisig3, "\0\0\125\252", 4) 686 && !bcmp(fp->fsisig4, "\0\0\125\252", 4)) 687 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 688 else 689 pmp->pm_fsinfo = 0; 690 brelse(bp); 691 bp = NULL; 692 } 693 694 /* 695 * Check and validate (or perhaps invalidate?) the fsinfo structure? XXX 696 */ 697 698 /* 699 * Allocate memory for the bitmap of allocated clusters, and then 700 * fill it in. 701 */ 702 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 703 / N_INUSEBITS) 704 * sizeof(*pmp->pm_inusemap), 705 M_MSDOSFSFAT, M_WAITOK); 706 707 /* 708 * fillinusemap() needs pm_devvp. 709 */ 710 pmp->pm_dev = dev; 711 pmp->pm_devvp = devvp; 712 713 /* 714 * Have the inuse map filled in. 715 */ 716 if ((error = fillinusemap(pmp)) != 0) 717 goto error_exit; 718 719 /* 720 * If they want fat updates to be synchronous then let them suffer 721 * the performance degradation in exchange for the on disk copy of 722 * the fat being correct just about all the time. I suppose this 723 * would be a good thing to turn on if the kernel is still flakey. 724 */ 725 if (mp->mnt_flag & MNT_SYNCHRONOUS) 726 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 727 728 /* 729 * Finish up. 730 */ 731 if (ronly) 732 pmp->pm_flags |= MSDOSFSMNT_RONLY; 733 else 734 pmp->pm_fmod = 1; 735 mp->mnt_data = (qaddr_t) pmp; 736 mp->mnt_stat.f_fsid.val[0] = (long)dev; 737 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 738 mp->mnt_flag |= MNT_LOCAL; 739 devvp->v_specmountpoint = mp; 740 741 return 0; 742 743error_exit: 744 if (bp) 745 brelse(bp); 746 (void) VOP_CLOSE(devvp, ronly ? FREAD : FREAD | FWRITE, NOCRED, p); 747 if (pmp) { 748 if (pmp->pm_inusemap) 749 free(pmp->pm_inusemap, M_MSDOSFSFAT); 750 free(pmp, M_MSDOSFSMNT); 751 mp->mnt_data = (qaddr_t)0; 752 } 753 return (error); 754} 755 756static int 757msdosfs_start(mp, flags, p) 758 struct mount *mp; 759 int flags; 760 struct proc *p; 761{ 762 763 return (0); 764} 765 766/* 767 * Unmount the filesystem described by mp. 768 */ 769static int 770msdosfs_unmount(mp, mntflags, p) 771 struct mount *mp; 772 int mntflags; 773 struct proc *p; 774{ 775 struct msdosfsmount *pmp; 776 int error, flags; 777 778 flags = 0; 779 if (mntflags & MNT_FORCE) 780 flags |= FORCECLOSE; 781 error = vflush(mp, NULLVP, flags); 782 if (error) 783 return error; 784 pmp = VFSTOMSDOSFS(mp); 785 pmp->pm_devvp->v_specmountpoint = NULL; 786#ifdef MSDOSFS_DEBUG 787 { 788 struct vnode *vp = pmp->pm_devvp; 789 790 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 791 printf("flag %08lx, usecount %d, writecount %d, holdcnt %ld\n", 792 vp->v_flag, vp->v_usecount, vp->v_writecount, vp->v_holdcnt); 793 printf("lastr %d, id %lu, mount %p, op %p\n", 794 vp->v_lastr, vp->v_id, vp->v_mount, vp->v_op); 795 printf("freef %p, freeb %p, mount %p\n", 796 vp->v_freelist.tqe_next, vp->v_freelist.tqe_prev, 797 vp->v_mount); 798 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %ld, type %d\n", 799 vp->v_cleanblkhd.lh_first, 800 vp->v_dirtyblkhd.lh_first, 801 vp->v_numoutput, vp->v_type); 802 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 803 vp->v_socket, vp->v_tag, 804 ((u_int *)vp->v_data)[0], 805 ((u_int *)vp->v_data)[1]); 806 } 807#endif 808 error = VOP_CLOSE(pmp->pm_devvp, 809 (pmp->pm_flags&MSDOSFSMNT_RONLY) ? FREAD : FREAD | FWRITE, 810 NOCRED, p); 811 vrele(pmp->pm_devvp); 812 free(pmp->pm_inusemap, M_MSDOSFSFAT); 813 free(pmp, M_MSDOSFSMNT); 814 mp->mnt_data = (qaddr_t)0; 815 mp->mnt_flag &= ~MNT_LOCAL; 816 return (error); 817} 818 819static int 820msdosfs_root(mp, vpp) 821 struct mount *mp; 822 struct vnode **vpp; 823{ 824 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 825 struct denode *ndep; 826 int error; 827 828#ifdef MSDOSFS_DEBUG 829 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 830#endif 831 error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep); 832 if (error) 833 return (error); 834 *vpp = DETOV(ndep); 835 return (0); 836} 837 838static int 839msdosfs_quotactl(mp, cmds, uid, arg, p) 840 struct mount *mp; 841 int cmds; 842 uid_t uid; 843 caddr_t arg; 844 struct proc *p; 845{ 846 return EOPNOTSUPP; 847} 848 849static int 850msdosfs_statfs(mp, sbp, p) 851 struct mount *mp; 852 struct statfs *sbp; 853 struct proc *p; 854{ 855 struct msdosfsmount *pmp; 856 857 pmp = VFSTOMSDOSFS(mp); 858 sbp->f_bsize = pmp->pm_bpcluster; 859 sbp->f_iosize = pmp->pm_bpcluster; 860 sbp->f_blocks = pmp->pm_nmbrofclusters; 861 sbp->f_bfree = pmp->pm_freeclustercount; 862 sbp->f_bavail = pmp->pm_freeclustercount; 863 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 864 sbp->f_ffree = 0; /* what to put in here? */ 865 if (sbp != &mp->mnt_stat) { 866 sbp->f_type = mp->mnt_vfc->vfc_typenum; 867 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 868 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 869 } 870 strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN); 871 return (0); 872} 873 874static int 875msdosfs_sync(mp, waitfor, cred, p) 876 struct mount *mp; 877 int waitfor; 878 struct ucred *cred; 879 struct proc *p; 880{ 881 struct vnode *vp, *nvp; 882 struct denode *dep; 883 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 884 int error, allerror = 0; 885 886 /* 887 * If we ever switch to not updating all of the fats all the time, 888 * this would be the place to update them from the first one. 889 */ 890 if (pmp->pm_fmod != 0) 891 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 892 panic("msdosfs_sync: rofs mod"); 893 else { 894 /* update fats here */ 895 } 896 /* 897 * Write back each (modified) denode. 898 */ 899 simple_lock(&mntvnode_slock); 900loop: 901 for (vp = mp->mnt_vnodelist.lh_first; 902 vp != NULL; 903 vp = nvp) { 904 /* 905 * If the vnode that we are about to sync is no longer 906 * assoicated with this mount point, start over. 907 */ 908 if (vp->v_mount != mp) 909 goto loop; 910 911 simple_lock(&vp->v_interlock); 912 nvp = vp->v_mntvnodes.le_next; 913 dep = VTODE(vp); 914 if (vp->v_type == VNON 915 || (waitfor == MNT_LAZY) /* can this happen with msdosfs? */ 916 || (((dep->de_flag & 917 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0) 918 && (vp->v_dirtyblkhd.lh_first == NULL))) { 919 simple_unlock(&vp->v_interlock); 920 continue; 921 } 922 simple_unlock(&mntvnode_slock); 923 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, p); 924 if (error) { 925 simple_lock(&mntvnode_slock); 926 if (error == ENOENT) 927 goto loop; 928 continue; 929 } 930 error = VOP_FSYNC(vp, cred, waitfor, p); 931 if (error) 932 allerror = error; 933 VOP_UNLOCK(vp, 0, p); 934 vrele(vp); /* done with this one */ 935 simple_lock(&mntvnode_slock); 936 } 937 simple_unlock(&mntvnode_slock); 938 939 /* 940 * Flush filesystem control info. 941 */ 942 error = VOP_FSYNC(pmp->pm_devvp, cred, waitfor, p); 943 if (error) 944 allerror = error; 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 vfs_vrele, 1013 msdosfs_fhtovp, 1014 msdosfs_vptofh, 1015 msdosfs_init 1016}; 1017 1018VFS_SET(msdosfs_vfsops, msdos, MOUNT_MSDOS, 0); 1019