msdosfs_vfsops.c revision 33768
1/* $Id: msdosfs_vfsops.c,v 1.27 1998/02/23 14:57:50 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#ifdef PC98 373 u_int pc98_wrk; 374 u_int Phy_Sector_Size; 375#endif 376 struct byte_bpb710 *b710; 377 u_int8_t SecPerClust; 378 int ronly, error; 379 int bsize = 0, dtype = 0, tmp; 380 381 /* 382 * Disallow multiple mounts of the same device. 383 * Disallow mounting of a device that is currently in use 384 * (except for root, which might share swap device for miniroot). 385 * Flush out any old buffers remaining from a previous use. 386 */ 387 error = vfs_mountedon(devvp); 388 if (error) 389 return (error); 390 if (vcount(devvp) > 1 && devvp != rootvp) 391 return (EBUSY); 392 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p); 393 error = vinvalbuf(devvp, V_SAVE, p->p_ucred, p, 0, 0); 394 VOP_UNLOCK(devvp, 0, p); 395 if (error) 396 return (error); 397 398 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 399 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p); 400 if (error) 401 return (error); 402 403 bp = NULL; /* both used in error_exit */ 404 pmp = NULL; 405 406#ifndef __FreeBSD__ 407 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 408 /* 409 * We need the disklabel to calculate the size of a FAT entry 410 * later on. Also make sure the partition contains a filesystem 411 * of type FS_MSDOS. This doesn't work for floppies, so we have 412 * to check for them too. 413 * 414 * At least some parts of the msdos fs driver seem to assume 415 * that the size of a disk block will always be 512 bytes. 416 * Let's check it... 417 */ 418 error = VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, 419 FREAD, NOCRED, p); 420 if (error) 421 goto error_exit; 422 tmp = dpart.part->p_fstype; 423 dtype = dpart.disklab->d_type; 424 bsize = dpart.disklab->d_secsize; 425 if (bsize != 512 || (dtype!=DTYPE_FLOPPY && tmp!=FS_MSDOS)) { 426 error = EINVAL; 427 goto error_exit; 428 } 429 } 430#endif 431 432 /* 433 * Read the boot sector of the filesystem, and then check the 434 * boot signature. If not a dos boot sector then error out. 435 */ 436#ifdef PC98 437 devvp->v_flag &= 0xffff; 438 error = bread(devvp, 0, 1024, NOCRED, &bp); 439#else 440 error = bread(devvp, 0, 512, NOCRED, &bp); 441#endif 442 if (error) 443 goto error_exit; 444 bp->b_flags |= B_AGE; 445 bsp = (union bootsector *)bp->b_data; 446 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 447 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 448 b710 = (struct byte_bpb710 *)bsp->bs710.bsPBP; 449 450#ifndef __FreeBSD__ 451 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 452#endif 453#ifdef PC98 454 if ((bsp->bs50.bsBootSectSig0 != BOOTSIG0 455 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) 456 && (bsp->bs50.bsBootSectSig0 != 0 /* PC98 DOS 3.3x */ 457 || bsp->bs50.bsBootSectSig1 != 0) 458 && (bsp->bs50.bsBootSectSig0 != 0x90 /* PC98 DOS 5.0 */ 459 || bsp->bs50.bsBootSectSig1 != 0x3d) 460 && (bsp->bs50.bsBootSectSig0 != 0x46 /* PC98 DOS 3.3B */ 461 || bsp->bs50.bsBootSectSig1 != 0xfa)) { 462#else 463 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 464 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 465#endif 466 error = EINVAL; 467 goto error_exit; 468 } 469#ifndef __FreeBSD__ 470 } 471#endif 472 473 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK); 474 bzero((caddr_t)pmp, sizeof *pmp); 475 pmp->pm_mountp = mp; 476 477 /* 478 * Compute several useful quantities from the bpb in the 479 * bootsector. Copy in the dos 5 variant of the bpb then fix up 480 * the fields that are different between dos 5 and dos 3.3. 481 */ 482 SecPerClust = b50->bpbSecPerClust; 483 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 484 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 485 pmp->pm_FATs = b50->bpbFATs; 486 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 487 pmp->pm_Sectors = getushort(b50->bpbSectors); 488 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 489 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 490 pmp->pm_Heads = getushort(b50->bpbHeads); 491 pmp->pm_Media = b50->bpbMedia; 492 493#ifndef __FreeBSD__ 494 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 495#endif 496 /* XXX - We should probably check more values here */ 497 if (!pmp->pm_BytesPerSec || !SecPerClust 498 || !pmp->pm_Heads || pmp->pm_Heads > 255 499#ifdef PC98 500 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 255) { 501#else 502 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 63) { 503#endif 504 error = EINVAL; 505 goto error_exit; 506 } 507#ifndef __FreeBSD__ 508 } 509#endif 510 511 if (pmp->pm_Sectors == 0) { 512 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 513 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 514 } else { 515 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 516 pmp->pm_HugeSectors = pmp->pm_Sectors; 517 } 518#ifdef PC98 /* for PC98 added Satoshi Yasuda */ 519 Phy_Sector_Size = 512; 520 if ((devvp->v_rdev>>8) == 2) { /* floppy check */ 521 if (((devvp->v_rdev&077) == 2) && (pmp->pm_HugeSectors == 1232)) { 522 Phy_Sector_Size = 1024; /* 2HD */ 523 /* 524 * 1024byte/sector support 525 */ 526 devvp->v_flag |= 0x10000; 527 } else { 528 if ((((devvp->v_rdev&077) == 3) /* 2DD 8 or 9 sector */ 529 && (pmp->pm_HugeSectors == 1440)) /* 9 sector */ 530 || (((devvp->v_rdev&077) == 4) 531 && (pmp->pm_HugeSectors == 1280)) /* 8 sector */ 532 || (((devvp->v_rdev&077) == 5) 533 && (pmp->pm_HugeSectors == 2880))) { /* 1.44M */ 534 Phy_Sector_Size = 512; 535 } else { 536 if (((devvp->v_rdev&077) != 1) 537 && ((devvp->v_rdev&077) != 0)) { /* 2HC */ 538 error = EINVAL; 539 goto error_exit; 540 } 541 } 542 } 543 } 544 pc98_wrk = pmp->pm_BytesPerSec / Phy_Sector_Size; 545 pmp->pm_BytesPerSec = Phy_Sector_Size; 546 SecPerClust = SecPerClust * pc98_wrk; 547 pmp->pm_HugeSectors = pmp->pm_HugeSectors * pc98_wrk; 548 pmp->pm_ResSectors = pmp->pm_ResSectors * pc98_wrk; 549 pmp->pm_FATsecs = pmp->pm_FATsecs * pc98_wrk; 550 pmp->pm_SecPerTrack = pmp->pm_SecPerTrack * pc98_wrk; 551 pmp->pm_HiddenSects = pmp->pm_HiddenSects * pc98_wrk; 552#endif /* */ 553 if (pmp->pm_HugeSectors > 0xffffffff / pmp->pm_BytesPerSec + 1) { 554 /* 555 * We cannot deal currently with this size of disk 556 * due to fileid limitations (see msdosfs_getattr and 557 * msdosfs_readdir) 558 */ 559 error = EINVAL; 560 goto error_exit; 561 } 562 563 if (pmp->pm_RootDirEnts == 0) { 564 if (bsp->bs710.bsBootSectSig2 != BOOTSIG2 565 || bsp->bs710.bsBootSectSig3 != BOOTSIG3 566 || pmp->pm_Sectors 567 || pmp->pm_FATsecs 568 || getushort(b710->bpbFSVers)) { 569 error = EINVAL; 570 goto error_exit; 571 } 572 pmp->pm_fatmask = FAT32_MASK; 573 pmp->pm_fatmult = 4; 574 pmp->pm_fatdiv = 1; 575 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 576 if (getushort(b710->bpbExtFlags) & FATMIRROR) 577 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 578 else 579 pmp->pm_flags |= MSDOSFS_FATMIRROR; 580 } else 581 pmp->pm_flags |= MSDOSFS_FATMIRROR; 582 583#ifndef __FreeBSD__ 584 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 585 if (FAT32(pmp)) { 586 /* 587 * GEMDOS doesn't know fat32. 588 */ 589 error = EINVAL; 590 goto error_exit; 591 } 592 593 /* 594 * Check a few values (could do some more): 595 * - logical sector size: power of 2, >= block size 596 * - sectors per cluster: power of 2, >= 1 597 * - number of sectors: >= 1, <= size of partition 598 */ 599 if ( (SecPerClust == 0) 600 || (SecPerClust & (SecPerClust - 1)) 601 || (pmp->pm_BytesPerSec < bsize) 602 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 603 || (pmp->pm_HugeSectors == 0) 604 || (pmp->pm_HugeSectors * (pmp->pm_BytesPerSec / bsize) 605 > dpart.part->p_size) 606 ) { 607 error = EINVAL; 608 goto error_exit; 609 } 610 /* 611 * XXX - Many parts of the msdos fs driver seem to assume that 612 * the number of bytes per logical sector (BytesPerSec) will 613 * always be the same as the number of bytes per disk block 614 * Let's pretend it is. 615 */ 616 tmp = pmp->pm_BytesPerSec / bsize; 617 pmp->pm_BytesPerSec = bsize; 618 pmp->pm_HugeSectors *= tmp; 619 pmp->pm_HiddenSects *= tmp; 620 pmp->pm_ResSectors *= tmp; 621 pmp->pm_Sectors *= tmp; 622 pmp->pm_FATsecs *= tmp; 623 SecPerClust *= tmp; 624 } 625#endif 626 pmp->pm_fatblk = pmp->pm_ResSectors; 627 if (FAT32(pmp)) { 628 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 629 pmp->pm_firstcluster = pmp->pm_fatblk 630 + (pmp->pm_FATs * pmp->pm_FATsecs); 631 pmp->pm_fsinfo = getushort(b710->bpbFSInfo); 632 } else { 633 pmp->pm_rootdirblk = pmp->pm_fatblk + 634 (pmp->pm_FATs * pmp->pm_FATsecs); 635 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 636 + pmp->pm_BytesPerSec - 1) 637 / pmp->pm_BytesPerSec;/* in sectors */ 638 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 639 } 640 641 pmp->pm_nmbrofclusters = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 642 SecPerClust; 643 pmp->pm_maxcluster = pmp->pm_nmbrofclusters + 1; 644 pmp->pm_fatsize = pmp->pm_FATsecs * pmp->pm_BytesPerSec; 645 646#ifndef __FreeBSD__ 647 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 648 if ((pmp->pm_nmbrofclusters <= (0xff0 - 2)) 649 && ((dtype == DTYPE_FLOPPY) || ((dtype == DTYPE_VNODE) 650 && ((pmp->pm_Heads == 1) || (pmp->pm_Heads == 2)))) 651 ) { 652 pmp->pm_fatmask = FAT12_MASK; 653 pmp->pm_fatmult = 3; 654 pmp->pm_fatdiv = 2; 655 } else { 656 pmp->pm_fatmask = FAT16_MASK; 657 pmp->pm_fatmult = 2; 658 pmp->pm_fatdiv = 1; 659 } 660 } else 661#endif 662 if (pmp->pm_fatmask == 0) { 663 if (pmp->pm_maxcluster 664 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 665 /* 666 * This will usually be a floppy disk. This size makes 667 * sure that one fat entry will not be split across 668 * multiple blocks. 669 */ 670 pmp->pm_fatmask = FAT12_MASK; 671 pmp->pm_fatmult = 3; 672 pmp->pm_fatdiv = 2; 673 } else { 674 pmp->pm_fatmask = FAT16_MASK; 675 pmp->pm_fatmult = 2; 676 pmp->pm_fatdiv = 1; 677 } 678 } 679 if (FAT12(pmp)) 680 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 681 else 682 pmp->pm_fatblocksize = MAXBSIZE; 683 684 pmp->pm_fatblocksec = pmp->pm_fatblocksize / pmp->pm_BytesPerSec; 685 pmp->pm_bnshift = ffs(pmp->pm_BytesPerSec) - 1; 686 687 /* 688 * Compute mask and shift value for isolating cluster relative byte 689 * offsets and cluster numbers from a file offset. 690 */ 691 pmp->pm_bpcluster = SecPerClust * pmp->pm_BytesPerSec; 692 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 693 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 694 695 /* 696 * Check for valid cluster size 697 * must be a power of 2 698 */ 699 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 700 error = EINVAL; 701 goto error_exit; 702 } 703 704 /* 705 * Release the bootsector buffer. 706 */ 707 brelse(bp); 708 bp = NULL; 709 710 /* 711 * Check FSInfo. 712 */ 713 if (pmp->pm_fsinfo) { 714 struct fsinfo *fp; 715 716 if ((error = bread(devvp, pmp->pm_fsinfo, 1024, NOCRED, &bp)) != 0) 717 goto error_exit; 718 fp = (struct fsinfo *)bp->b_data; 719 if (!bcmp(fp->fsisig1, "RRaA", 4) 720 && !bcmp(fp->fsisig2, "rrAa", 4) 721 && !bcmp(fp->fsisig3, "\0\0\125\252", 4) 722 && !bcmp(fp->fsisig4, "\0\0\125\252", 4)) 723 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 724 else 725 pmp->pm_fsinfo = 0; 726 brelse(bp); 727 bp = NULL; 728 } 729 730 /* 731 * Check and validate (or perhaps invalidate?) the fsinfo structure? XXX 732 */ 733 734 /* 735 * Allocate memory for the bitmap of allocated clusters, and then 736 * fill it in. 737 */ 738 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 739 / N_INUSEBITS) 740 * sizeof(*pmp->pm_inusemap), 741 M_MSDOSFSFAT, M_WAITOK); 742 743 /* 744 * fillinusemap() needs pm_devvp. 745 */ 746 pmp->pm_dev = dev; 747 pmp->pm_devvp = devvp; 748 749 /* 750 * Have the inuse map filled in. 751 */ 752 if ((error = fillinusemap(pmp)) != 0) 753 goto error_exit; 754 755 /* 756 * If they want fat updates to be synchronous then let them suffer 757 * the performance degradation in exchange for the on disk copy of 758 * the fat being correct just about all the time. I suppose this 759 * would be a good thing to turn on if the kernel is still flakey. 760 */ 761 if (mp->mnt_flag & MNT_SYNCHRONOUS) 762 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 763 764 /* 765 * Finish up. 766 */ 767 if (ronly) 768 pmp->pm_flags |= MSDOSFSMNT_RONLY; 769 else 770 pmp->pm_fmod = 1; 771 mp->mnt_data = (qaddr_t) pmp; 772 mp->mnt_stat.f_fsid.val[0] = (long)dev; 773 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 774 mp->mnt_flag |= MNT_LOCAL; 775 devvp->v_specflags |= SI_MOUNTEDON; 776 777 return 0; 778 779error_exit: 780 if (bp) 781 brelse(bp); 782 (void) VOP_CLOSE(devvp, ronly ? FREAD : FREAD | FWRITE, NOCRED, p); 783 if (pmp) { 784 if (pmp->pm_inusemap) 785 free(pmp->pm_inusemap, M_MSDOSFSFAT); 786 free(pmp, M_MSDOSFSMNT); 787 mp->mnt_data = (qaddr_t)0; 788 } 789 return (error); 790} 791 792static int 793msdosfs_start(mp, flags, p) 794 struct mount *mp; 795 int flags; 796 struct proc *p; 797{ 798 799 return (0); 800} 801 802/* 803 * Unmount the filesystem described by mp. 804 */ 805static int 806msdosfs_unmount(mp, mntflags, p) 807 struct mount *mp; 808 int mntflags; 809 struct proc *p; 810{ 811 struct msdosfsmount *pmp; 812 int error, flags; 813 814 flags = 0; 815 if (mntflags & MNT_FORCE) 816 flags |= FORCECLOSE; 817 error = vflush(mp, NULLVP, flags); 818 if (error) 819 return error; 820 pmp = VFSTOMSDOSFS(mp); 821 pmp->pm_devvp->v_specflags &= ~SI_MOUNTEDON; 822#ifdef MSDOSFS_DEBUG 823 { 824 struct vnode *vp = pmp->pm_devvp; 825 826 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 827 printf("flag %08lx, usecount %d, writecount %d, holdcnt %ld\n", 828 vp->v_flag, vp->v_usecount, vp->v_writecount, vp->v_holdcnt); 829 printf("lastr %d, id %lu, mount %p, op %p\n", 830 vp->v_lastr, vp->v_id, vp->v_mount, vp->v_op); 831 printf("freef %p, freeb %p, mount %p\n", 832 vp->v_freelist.tqe_next, vp->v_freelist.tqe_prev, 833 vp->v_mount); 834 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %ld, type %d\n", 835 vp->v_cleanblkhd.lh_first, 836 vp->v_dirtyblkhd.lh_first, 837 vp->v_numoutput, vp->v_type); 838 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 839 vp->v_socket, vp->v_tag, 840 ((u_int *)vp->v_data)[0], 841 ((u_int *)vp->v_data)[1]); 842 } 843#endif 844 error = VOP_CLOSE(pmp->pm_devvp, (pmp->pm_flags&MSDOSFSMNT_RONLY) ? FREAD : FREAD | FWRITE, 845 NOCRED, p); 846 vrele(pmp->pm_devvp); 847 free(pmp->pm_inusemap, M_MSDOSFSFAT); 848 free(pmp, M_MSDOSFSMNT); 849 mp->mnt_data = (qaddr_t)0; 850 mp->mnt_flag &= ~MNT_LOCAL; 851 return (error); 852} 853 854static int 855msdosfs_root(mp, vpp) 856 struct mount *mp; 857 struct vnode **vpp; 858{ 859 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 860 struct denode *ndep; 861 int error; 862 863#ifdef MSDOSFS_DEBUG 864 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 865#endif 866 error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep); 867 if (error) 868 return (error); 869 *vpp = DETOV(ndep); 870 return (0); 871} 872 873static int 874msdosfs_quotactl(mp, cmds, uid, arg, p) 875 struct mount *mp; 876 int cmds; 877 uid_t uid; 878 caddr_t arg; 879 struct proc *p; 880{ 881 return EOPNOTSUPP; 882} 883 884static int 885msdosfs_statfs(mp, sbp, p) 886 struct mount *mp; 887 struct statfs *sbp; 888 struct proc *p; 889{ 890 struct msdosfsmount *pmp; 891 892 pmp = VFSTOMSDOSFS(mp); 893 sbp->f_bsize = pmp->pm_bpcluster; 894 sbp->f_iosize = pmp->pm_bpcluster; 895 sbp->f_blocks = pmp->pm_nmbrofclusters; 896 sbp->f_bfree = pmp->pm_freeclustercount; 897 sbp->f_bavail = pmp->pm_freeclustercount; 898 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 899 sbp->f_ffree = 0; /* what to put in here? */ 900 if (sbp != &mp->mnt_stat) { 901 sbp->f_type = mp->mnt_vfc->vfc_typenum; 902 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 903 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 904 } 905 strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN); 906 return (0); 907} 908 909static int 910msdosfs_sync(mp, waitfor, cred, p) 911 struct mount *mp; 912 int waitfor; 913 struct ucred *cred; 914 struct proc *p; 915{ 916 struct vnode *vp, *nvp; 917 struct denode *dep; 918 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 919 int error, allerror = 0; 920 921 /* 922 * If we ever switch to not updating all of the fats all the time, 923 * this would be the place to update them from the first one. 924 */ 925 if (pmp->pm_fmod != 0) 926 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 927 panic("msdosfs_sync: rofs mod"); 928 else { 929 /* update fats here */ 930 } 931 /* 932 * Write back each (modified) denode. 933 */ 934 simple_lock(&mntvnode_slock); 935loop: 936 for (vp = mp->mnt_vnodelist.lh_first; 937 vp != NULL; 938 vp = nvp) { 939 /* 940 * If the vnode that we are about to sync is no longer 941 * assoicated with this mount point, start over. 942 */ 943 if (vp->v_mount != mp) 944 goto loop; 945 946 simple_lock(&vp->v_interlock); 947 nvp = vp->v_mntvnodes.le_next; 948 dep = VTODE(vp); 949 if (vp->v_type == VNON || ((dep->de_flag & 950 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0) 951 && vp->v_dirtyblkhd.lh_first == NULL) { 952 simple_unlock(&vp->v_interlock); 953 continue; 954 } 955 simple_unlock(&mntvnode_slock); 956 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, p); 957 if (error) { 958 simple_lock(&mntvnode_slock); 959 if (error == ENOENT) 960 goto loop; 961 continue; 962 } 963 error = VOP_FSYNC(vp, cred, waitfor, p); 964 if (error) 965 allerror = error; 966 VOP_UNLOCK(vp, 0, p); 967 vrele(vp); /* done with this one */ 968 simple_lock(&mntvnode_slock); 969 } 970 simple_unlock(&mntvnode_slock); 971 972 /* 973 * Flush filesystem control info. 974 */ 975 error = VOP_FSYNC(pmp->pm_devvp, cred, waitfor, p); 976 if (error) 977 allerror = error; 978 return (allerror); 979} 980 981static int 982msdosfs_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp) 983 struct mount *mp; 984 struct fid *fhp; 985 struct sockaddr *nam; 986 struct vnode **vpp; 987 int *exflagsp; 988 struct ucred **credanonp; 989{ 990 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 991 struct defid *defhp = (struct defid *) fhp; 992 struct denode *dep; 993 struct netcred *np; 994 int error; 995 996 np = vfs_export_lookup(mp, &pmp->pm_export, nam); 997 if (np == NULL) 998 return (EACCES); 999 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 1000 if (error) { 1001 *vpp = NULLVP; 1002 return (error); 1003 } 1004 *vpp = DETOV(dep); 1005 *exflagsp = np->netc_exflags; 1006 *credanonp = &np->netc_anon; 1007 return (0); 1008} 1009 1010static int 1011msdosfs_vptofh(vp, fhp) 1012 struct vnode *vp; 1013 struct fid *fhp; 1014{ 1015 struct denode *dep; 1016 struct defid *defhp; 1017 1018 dep = VTODE(vp); 1019 defhp = (struct defid *)fhp; 1020 defhp->defid_len = sizeof(struct defid); 1021 defhp->defid_dirclust = dep->de_dirclust; 1022 defhp->defid_dirofs = dep->de_diroffset; 1023 /* defhp->defid_gen = dep->de_gen; */ 1024 return (0); 1025} 1026 1027static int 1028msdosfs_vget(mp, ino, vpp) 1029 struct mount *mp; 1030 ino_t ino; 1031 struct vnode **vpp; 1032{ 1033 return EOPNOTSUPP; 1034} 1035 1036static struct vfsops msdosfs_vfsops = { 1037 msdosfs_mount, 1038 msdosfs_start, 1039 msdosfs_unmount, 1040 msdosfs_root, 1041 msdosfs_quotactl, 1042 msdosfs_statfs, 1043 msdosfs_sync, 1044 msdosfs_vget, 1045 msdosfs_fhtovp, 1046 msdosfs_vptofh, 1047 msdosfs_init 1048}; 1049 1050VFS_SET(msdosfs_vfsops, msdos, MOUNT_MSDOS, 0); 1051