msdosfs_vfsops.c revision 75934
1/* $FreeBSD: head/sys/fs/msdosfs/msdosfs_vfsops.c 75934 2001-04-25 07:07:52Z phk $ */ 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 <net/radix.h> 59#include <sys/socket.h> 60#include <sys/mount.h> 61#include <sys/bio.h> 62#include <sys/buf.h> 63#include <sys/fcntl.h> 64#include <sys/malloc.h> 65#include <sys/stat.h> /* defines ALLPERMS */ 66#include <sys/mutex.h> 67 68#include <msdosfs/bpb.h> 69#include <msdosfs/bootsect.h> 70#include <msdosfs/direntry.h> 71#include <msdosfs/denode.h> 72#include <msdosfs/msdosfsmount.h> 73#include <msdosfs/fat.h> 74 75#define MSDOSFS_DFLTBSIZE 4096 76 77#if 1 /*def PC98*/ 78/* 79 * XXX - The boot signature formatted by NEC PC-98 DOS looks like a 80 * garbage or a random value :-{ 81 * If you want to use that broken-signatured media, define the 82 * following symbol even though PC/AT. 83 * (ex. mount PC-98 DOS formatted FD on PC/AT) 84 */ 85#define MSDOSFS_NOCHECKSIG 86#endif 87 88MALLOC_DEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOSFS mount structure"); 89static MALLOC_DEFINE(M_MSDOSFSFAT, "MSDOSFS FAT", "MSDOSFS file allocation table"); 90 91static int update_mp __P((struct mount *mp, struct msdosfs_args *argp)); 92static int mountmsdosfs __P((struct vnode *devvp, struct mount *mp, 93 struct proc *p, struct msdosfs_args *argp)); 94static int msdosfs_fhtovp __P((struct mount *, struct fid *, 95 struct vnode **)); 96static int msdosfs_mount __P((struct mount *, char *, caddr_t, 97 struct nameidata *, struct proc *)); 98static int msdosfs_root __P((struct mount *, struct vnode **)); 99static int msdosfs_statfs __P((struct mount *, struct statfs *, 100 struct proc *)); 101static int msdosfs_sync __P((struct mount *, int, struct ucred *, 102 struct proc *)); 103static int msdosfs_unmount __P((struct mount *, int, struct proc *)); 104static int msdosfs_vptofh __P((struct vnode *, struct fid *)); 105 106static int 107update_mp(mp, argp) 108 struct mount *mp; 109 struct msdosfs_args *argp; 110{ 111 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 112 int error; 113 114 pmp->pm_gid = argp->gid; 115 pmp->pm_uid = argp->uid; 116 pmp->pm_mask = argp->mask & ALLPERMS; 117 pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT; 118 if (pmp->pm_flags & MSDOSFSMNT_U2WTABLE) { 119 bcopy(argp->u2w, pmp->pm_u2w, sizeof(pmp->pm_u2w)); 120 bcopy(argp->d2u, pmp->pm_d2u, sizeof(pmp->pm_d2u)); 121 bcopy(argp->u2d, pmp->pm_u2d, sizeof(pmp->pm_u2d)); 122 } 123 if (pmp->pm_flags & MSDOSFSMNT_ULTABLE) { 124 bcopy(argp->ul, pmp->pm_ul, sizeof(pmp->pm_ul)); 125 bcopy(argp->lu, pmp->pm_lu, sizeof(pmp->pm_lu)); 126 } 127 128#ifndef __FreeBSD__ 129 /* 130 * GEMDOS knows nothing (yet) about win95 131 */ 132 if (pmp->pm_flags & MSDOSFSMNT_GEMDOSFS) 133 pmp->pm_flags |= MSDOSFSMNT_NOWIN95; 134#endif 135 136 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 137 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 138 else if (!(pmp->pm_flags & 139 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 140 struct vnode *rootvp; 141 142 /* 143 * Try to divine whether to support Win'95 long filenames 144 */ 145 if (FAT32(pmp)) 146 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 147 else { 148 if ((error = msdosfs_root(mp, &rootvp)) != 0) 149 return error; 150 pmp->pm_flags |= findwin95(VTODE(rootvp)) 151 ? MSDOSFSMNT_LONGNAME 152 : MSDOSFSMNT_SHORTNAME; 153 vput(rootvp); 154 } 155 } 156 return 0; 157} 158 159#ifndef __FreeBSD__ 160int 161msdosfs_mountroot() 162{ 163 register struct mount *mp; 164 struct proc *p = curproc; /* XXX */ 165 size_t size; 166 int error; 167 struct msdosfs_args args; 168 169 if (root_device->dv_class != DV_DISK) 170 return (ENODEV); 171 172 /* 173 * Get vnodes for swapdev and rootdev. 174 */ 175 if (bdevvp(rootdev, &rootvp)) 176 panic("msdosfs_mountroot: can't setup rootvp"); 177 178 mp = malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK | M_ZERO); 179 mp->mnt_op = &msdosfs_vfsops; 180 mp->mnt_flag = 0; 181 LIST_INIT(&mp->mnt_vnodelist); 182 183 args.flags = 0; 184 args.uid = 0; 185 args.gid = 0; 186 args.mask = 0777; 187 188 if ((error = mountmsdosfs(rootvp, mp, p, &args)) != 0) { 189 free(mp, M_MOUNT); 190 return (error); 191 } 192 193 if ((error = update_mp(mp, &args)) != 0) { 194 (void)msdosfs_unmount(mp, 0, p); 195 free(mp, M_MOUNT); 196 return (error); 197 } 198 199 if ((error = vfs_lock(mp)) != 0) { 200 (void)msdosfs_unmount(mp, 0, p); 201 free(mp, M_MOUNT); 202 return (error); 203 } 204 205 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 206 mp->mnt_vnodecovered = NULLVP; 207 (void) copystr("/", mp->mnt_stat.f_mntonname, MNAMELEN - 1, 208 &size); 209 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); 210 (void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 211 &size); 212 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 213 (void)msdosfs_statfs(mp, &mp->mnt_stat, p); 214 vfs_unlock(mp); 215 return (0); 216} 217#endif 218 219/* 220 * mp - path - addr in user space of mount point (ie /usr or whatever) 221 * data - addr in user space of mount params including the name of the block 222 * special file to treat as a filesystem. 223 */ 224static int 225msdosfs_mount(mp, path, data, ndp, p) 226 struct mount *mp; 227 char *path; 228 caddr_t data; 229 struct nameidata *ndp; 230 struct proc *p; 231{ 232 struct vnode *devvp; /* vnode for blk device to mount */ 233 struct msdosfs_args args; /* will hold data from mount request */ 234 /* msdosfs specific mount control block */ 235 struct msdosfsmount *pmp = NULL; 236 size_t size; 237 int error, flags; 238 mode_t accessmode; 239 240 error = copyin(data, (caddr_t)&args, sizeof(struct msdosfs_args)); 241 if (error) 242 return (error); 243 if (args.magic != MSDOSFS_ARGSMAGIC) 244 args.flags = 0; 245 /* 246 * If updating, check whether changing from read-only to 247 * read/write; if there is no device name, that's all we do. 248 */ 249 if (mp->mnt_flag & MNT_UPDATE) { 250 pmp = VFSTOMSDOSFS(mp); 251 error = 0; 252 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_RDONLY)) { 253 flags = WRITECLOSE; 254 if (mp->mnt_flag & MNT_FORCE) 255 flags |= FORCECLOSE; 256 error = vflush(mp, NULLVP, flags); 257 } 258 if (!error && (mp->mnt_flag & MNT_RELOAD)) 259 /* not yet implemented */ 260 error = EOPNOTSUPP; 261 if (error) 262 return (error); 263 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_kern_flag & MNTK_WANTRDWR)) { 264 /* 265 * If upgrade to read-write by non-root, then verify 266 * that user has necessary permissions on the device. 267 */ 268 if (p->p_ucred->cr_uid != 0) { 269 devvp = pmp->pm_devvp; 270 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p); 271 error = VOP_ACCESS(devvp, VREAD | VWRITE, 272 p->p_ucred, p); 273 if (error) { 274 VOP_UNLOCK(devvp, 0, p); 275 return (error); 276 } 277 VOP_UNLOCK(devvp, 0, p); 278 } 279 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 280 } 281 if (args.fspec == 0) { 282#ifdef __notyet__ /* doesn't work correctly with current mountd XXX */ 283 if (args.flags & MSDOSFSMNT_MNTOPT) { 284 pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT; 285 pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT; 286 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 287 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 288 } 289#endif 290 /* 291 * Process export requests. 292 */ 293 return (vfs_export(mp, &args.export)); 294 } 295 } 296 /* 297 * Not an update, or updating the name: look up the name 298 * and verify that it refers to a sensible block device. 299 */ 300 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p); 301 error = namei(ndp); 302 if (error) 303 return (error); 304 devvp = ndp->ni_vp; 305 NDFREE(ndp, NDF_ONLY_PNBUF); 306 307 if (!vn_isdisk(devvp, &error)) { 308 vrele(devvp); 309 return (error); 310 } 311 /* 312 * If mount by non-root, then verify that user has necessary 313 * permissions on the device. 314 */ 315 if (p->p_ucred->cr_uid != 0) { 316 accessmode = VREAD; 317 if ((mp->mnt_flag & MNT_RDONLY) == 0) 318 accessmode |= VWRITE; 319 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p); 320 error = VOP_ACCESS(devvp, accessmode, p->p_ucred, p); 321 if (error) { 322 vput(devvp); 323 return (error); 324 } 325 VOP_UNLOCK(devvp, 0, p); 326 } 327 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 328 error = mountmsdosfs(devvp, mp, p, &args); 329#ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 330 pmp = VFSTOMSDOSFS(mp); 331#endif 332 } else { 333 if (devvp != pmp->pm_devvp) 334 error = EINVAL; /* XXX needs translation */ 335 else 336 vrele(devvp); 337 } 338 if (error) { 339 vrele(devvp); 340 return (error); 341 } 342 343 error = update_mp(mp, &args); 344 if (error) { 345 msdosfs_unmount(mp, MNT_FORCE, p); 346 return error; 347 } 348 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 349 &size); 350 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 351 (void) msdosfs_statfs(mp, &mp->mnt_stat, p); 352#ifdef MSDOSFS_DEBUG 353 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 354#endif 355 return (0); 356} 357 358static int 359mountmsdosfs(devvp, mp, p, argp) 360 struct vnode *devvp; 361 struct mount *mp; 362 struct proc *p; 363 struct msdosfs_args *argp; 364{ 365 struct msdosfsmount *pmp; 366 struct buf *bp; 367 dev_t dev = devvp->v_rdev; 368#ifndef __FreeBSD__ 369 struct partinfo dpart; 370 int bsize = 0, dtype = 0, tmp; 371#endif 372 union bootsector *bsp; 373 struct byte_bpb33 *b33; 374 struct byte_bpb50 *b50; 375 struct byte_bpb710 *b710; 376 u_int8_t SecPerClust; 377 u_long clusters; 378 int ronly, error; 379 380 /* 381 * Disallow multiple mounts of the same device. 382 * Disallow mounting of a device that is currently in use 383 * (except for root, which might share swap device for miniroot). 384 * Flush out any old buffers remaining from a previous use. 385 */ 386 error = vfs_mountedon(devvp); 387 if (error) 388 return (error); 389 if (vcount(devvp) > 1 && devvp != rootvp) 390 return (EBUSY); 391 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p); 392 error = vinvalbuf(devvp, V_SAVE, p->p_ucred, p, 0, 0); 393 VOP_UNLOCK(devvp, 0, p); 394 if (error) 395 return (error); 396 397 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 398 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p); 399 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p); 400 VOP_UNLOCK(devvp, 0, p); 401 if (error) 402 return (error); 403 404 bp = NULL; /* both used in error_exit */ 405 pmp = NULL; 406 407#ifndef __FreeBSD__ 408 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 409 /* 410 * We need the disklabel to calculate the size of a FAT entry 411 * later on. Also make sure the partition contains a filesystem 412 * of type FS_MSDOS. This doesn't work for floppies, so we have 413 * to check for them too. 414 * 415 * At least some parts of the msdos fs driver seem to assume 416 * that the size of a disk block will always be 512 bytes. 417 * Let's check it... 418 */ 419 error = VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, 420 FREAD, NOCRED, p); 421 if (error) 422 goto error_exit; 423 tmp = dpart.part->p_fstype; 424 dtype = dpart.disklab->d_type; 425 bsize = dpart.disklab->d_secsize; 426 if (bsize != 512 || (dtype!=DTYPE_FLOPPY && tmp!=FS_MSDOS)) { 427 error = EINVAL; 428 goto error_exit; 429 } 430 } 431#endif 432 433 /* 434 * Read the boot sector of the filesystem, and then check the 435 * boot signature. If not a dos boot sector then error out. 436 * 437 * NOTE: 2048 is a maximum sector size in current... 438 */ 439 error = bread(devvp, 0, 2048, NOCRED, &bp); 440 if (error) 441 goto error_exit; 442 bp->b_flags |= B_AGE; 443 bsp = (union bootsector *)bp->b_data; 444 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 445 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 446 b710 = (struct byte_bpb710 *)bsp->bs710.bsPBP; 447 448#ifndef __FreeBSD__ 449 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 450#endif 451#ifndef MSDOSFS_NOCHECKSIG 452 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 453 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 454 error = EINVAL; 455 goto error_exit; 456 } 457#endif 458#ifndef __FreeBSD__ 459 } 460#endif 461 462 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK | M_ZERO); 463 pmp->pm_mountp = mp; 464 465 /* 466 * Compute several useful quantities from the bpb in the 467 * bootsector. Copy in the dos 5 variant of the bpb then fix up 468 * the fields that are different between dos 5 and dos 3.3. 469 */ 470 SecPerClust = b50->bpbSecPerClust; 471 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 472 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 473 pmp->pm_FATs = b50->bpbFATs; 474 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 475 pmp->pm_Sectors = getushort(b50->bpbSectors); 476 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 477 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 478 pmp->pm_Heads = getushort(b50->bpbHeads); 479 pmp->pm_Media = b50->bpbMedia; 480 481 /* calculate the ratio of sector size to DEV_BSIZE */ 482 pmp->pm_BlkPerSec = pmp->pm_BytesPerSec / DEV_BSIZE; 483 484#ifndef __FreeBSD__ 485 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 486#endif 487 /* XXX - We should probably check more values here */ 488 if (!pmp->pm_BytesPerSec || !SecPerClust 489 || !pmp->pm_Heads || pmp->pm_Heads > 255 490#ifdef PC98 491 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 255) { 492#else 493 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 63) { 494#endif 495 error = EINVAL; 496 goto error_exit; 497 } 498#ifndef __FreeBSD__ 499 } 500#endif 501 502 if (pmp->pm_Sectors == 0) { 503 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 504 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 505 } else { 506 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 507 pmp->pm_HugeSectors = pmp->pm_Sectors; 508 } 509 if (pmp->pm_HugeSectors > 0xffffffff / 510 (pmp->pm_BytesPerSec / sizeof(struct direntry)) + 1) { 511 /* 512 * We cannot deal currently with this size of disk 513 * due to fileid limitations (see msdosfs_getattr and 514 * msdosfs_readdir) 515 */ 516 error = EINVAL; 517 printf("mountmsdosfs(): disk too big, sorry\n"); 518 goto error_exit; 519 } 520 521 if (pmp->pm_RootDirEnts == 0) { 522 if (bsp->bs710.bsBootSectSig2 != BOOTSIG2 523 || bsp->bs710.bsBootSectSig3 != BOOTSIG3 524 || pmp->pm_Sectors 525 || pmp->pm_FATsecs 526 || getushort(b710->bpbFSVers)) { 527 error = EINVAL; 528 printf("mountmsdosfs(): bad FAT32 filesystem\n"); 529 goto error_exit; 530 } 531 pmp->pm_fatmask = FAT32_MASK; 532 pmp->pm_fatmult = 4; 533 pmp->pm_fatdiv = 1; 534 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 535 if (getushort(b710->bpbExtFlags) & FATMIRROR) 536 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 537 else 538 pmp->pm_flags |= MSDOSFS_FATMIRROR; 539 } else 540 pmp->pm_flags |= MSDOSFS_FATMIRROR; 541 542 /* 543 * Check a few values (could do some more): 544 * - logical sector size: power of 2, >= block size 545 * - sectors per cluster: power of 2, >= 1 546 * - number of sectors: >= 1, <= size of partition 547 */ 548 if ( (SecPerClust == 0) 549 || (SecPerClust & (SecPerClust - 1)) 550 || (pmp->pm_BytesPerSec < DEV_BSIZE) 551 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 552 || (pmp->pm_HugeSectors == 0) 553 ) { 554 error = EINVAL; 555 goto error_exit; 556 } 557 558 pmp->pm_HugeSectors *= pmp->pm_BlkPerSec; 559 pmp->pm_HiddenSects *= pmp->pm_BlkPerSec; /* XXX not used? */ 560 pmp->pm_FATsecs *= pmp->pm_BlkPerSec; 561 SecPerClust *= pmp->pm_BlkPerSec; 562 563 pmp->pm_fatblk = pmp->pm_ResSectors * pmp->pm_BlkPerSec; 564 565 if (FAT32(pmp)) { 566 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 567 pmp->pm_firstcluster = pmp->pm_fatblk 568 + (pmp->pm_FATs * pmp->pm_FATsecs); 569 pmp->pm_fsinfo = getushort(b710->bpbFSInfo) * pmp->pm_BlkPerSec; 570 } else { 571 pmp->pm_rootdirblk = pmp->pm_fatblk + 572 (pmp->pm_FATs * pmp->pm_FATsecs); 573 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 574 + DEV_BSIZE - 1) 575 / DEV_BSIZE; /* in blocks */ 576 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 577 } 578 579 pmp->pm_maxcluster = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 580 SecPerClust + 1; 581 pmp->pm_fatsize = pmp->pm_FATsecs * DEV_BSIZE; /* XXX not used? */ 582 583#ifndef __FreeBSD__ 584 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 585 if ((pmp->pm_maxcluster <= (0xff0 - 2)) 586 && ((dtype == DTYPE_FLOPPY) || ((dtype == DTYPE_VNODE) 587 && ((pmp->pm_Heads == 1) || (pmp->pm_Heads == 2)))) 588 ) { 589 pmp->pm_fatmask = FAT12_MASK; 590 pmp->pm_fatmult = 3; 591 pmp->pm_fatdiv = 2; 592 } else { 593 pmp->pm_fatmask = FAT16_MASK; 594 pmp->pm_fatmult = 2; 595 pmp->pm_fatdiv = 1; 596 } 597 } else 598#endif 599 if (pmp->pm_fatmask == 0) { 600 if (pmp->pm_maxcluster 601 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 602 /* 603 * This will usually be a floppy disk. This size makes 604 * sure that one fat entry will not be split across 605 * multiple blocks. 606 */ 607 pmp->pm_fatmask = FAT12_MASK; 608 pmp->pm_fatmult = 3; 609 pmp->pm_fatdiv = 2; 610 } else { 611 pmp->pm_fatmask = FAT16_MASK; 612 pmp->pm_fatmult = 2; 613 pmp->pm_fatdiv = 1; 614 } 615 } 616 617 clusters = (pmp->pm_fatsize / pmp->pm_fatmult) * pmp->pm_fatdiv; 618 if (pmp->pm_maxcluster >= clusters) { 619 printf("Warning: number of clusters (%ld) exceeds FAT " 620 "capacity (%ld)\n", pmp->pm_maxcluster + 1, clusters); 621 pmp->pm_maxcluster = clusters - 1; 622 } 623 624 625 if (FAT12(pmp)) 626 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 627 else 628 pmp->pm_fatblocksize = MSDOSFS_DFLTBSIZE; 629 630 pmp->pm_fatblocksec = pmp->pm_fatblocksize / DEV_BSIZE; 631 pmp->pm_bnshift = ffs(DEV_BSIZE) - 1; 632 633 /* 634 * Compute mask and shift value for isolating cluster relative byte 635 * offsets and cluster numbers from a file offset. 636 */ 637 pmp->pm_bpcluster = SecPerClust * DEV_BSIZE; 638 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 639 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 640 641 /* 642 * Check for valid cluster size 643 * must be a power of 2 644 */ 645 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 646 error = EINVAL; 647 goto error_exit; 648 } 649 650 /* 651 * Release the bootsector buffer. 652 */ 653 brelse(bp); 654 bp = NULL; 655 656 /* 657 * Check FSInfo. 658 */ 659 if (pmp->pm_fsinfo) { 660 struct fsinfo *fp; 661 662 if ((error = bread(devvp, pmp->pm_fsinfo, fsi_size(pmp), 663 NOCRED, &bp)) != 0) 664 goto error_exit; 665 fp = (struct fsinfo *)bp->b_data; 666 if (!bcmp(fp->fsisig1, "RRaA", 4) 667 && !bcmp(fp->fsisig2, "rrAa", 4) 668 && !bcmp(fp->fsisig3, "\0\0\125\252", 4) 669 && !bcmp(fp->fsisig4, "\0\0\125\252", 4)) 670 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 671 else 672 pmp->pm_fsinfo = 0; 673 brelse(bp); 674 bp = NULL; 675 } 676 677 /* 678 * Check and validate (or perhaps invalidate?) the fsinfo structure? XXX 679 */ 680 681 /* 682 * Allocate memory for the bitmap of allocated clusters, and then 683 * fill it in. 684 */ 685 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 686 / N_INUSEBITS) 687 * sizeof(*pmp->pm_inusemap), 688 M_MSDOSFSFAT, M_WAITOK); 689 690 /* 691 * fillinusemap() needs pm_devvp. 692 */ 693 pmp->pm_dev = dev; 694 pmp->pm_devvp = devvp; 695 696 /* 697 * Have the inuse map filled in. 698 */ 699 if ((error = fillinusemap(pmp)) != 0) 700 goto error_exit; 701 702 /* 703 * If they want fat updates to be synchronous then let them suffer 704 * the performance degradation in exchange for the on disk copy of 705 * the fat being correct just about all the time. I suppose this 706 * would be a good thing to turn on if the kernel is still flakey. 707 */ 708 if (mp->mnt_flag & MNT_SYNCHRONOUS) 709 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 710 711 /* 712 * Finish up. 713 */ 714 if (ronly) 715 pmp->pm_flags |= MSDOSFSMNT_RONLY; 716 else 717 pmp->pm_fmod = 1; 718 mp->mnt_data = (qaddr_t) pmp; 719 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 720 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 721 mp->mnt_flag |= MNT_LOCAL; 722 devvp->v_rdev->si_mountpoint = mp; 723 724 return 0; 725 726error_exit: 727 if (bp) 728 brelse(bp); 729 (void) VOP_CLOSE(devvp, ronly ? FREAD : FREAD | FWRITE, NOCRED, p); 730 if (pmp) { 731 if (pmp->pm_inusemap) 732 free(pmp->pm_inusemap, M_MSDOSFSFAT); 733 free(pmp, M_MSDOSFSMNT); 734 mp->mnt_data = (qaddr_t)0; 735 } 736 return (error); 737} 738 739/* 740 * Unmount the filesystem described by mp. 741 */ 742static int 743msdosfs_unmount(mp, mntflags, p) 744 struct mount *mp; 745 int mntflags; 746 struct proc *p; 747{ 748 struct msdosfsmount *pmp; 749 int error, flags; 750 751 flags = 0; 752 if (mntflags & MNT_FORCE) 753 flags |= FORCECLOSE; 754 error = vflush(mp, NULLVP, flags); 755 if (error) 756 return error; 757 pmp = VFSTOMSDOSFS(mp); 758 pmp->pm_devvp->v_rdev->si_mountpoint = NULL; 759#ifdef MSDOSFS_DEBUG 760 { 761 struct vnode *vp = pmp->pm_devvp; 762 763 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 764 printf("flag %08lx, usecount %d, writecount %d, holdcnt %ld\n", 765 vp->v_flag, vp->v_usecount, vp->v_writecount, vp->v_holdcnt); 766 printf("id %lu, mount %p, op %p\n", 767 vp->v_id, vp->v_mount, vp->v_op); 768 printf("freef %p, freeb %p, mount %p\n", 769 TAILQ_NEXT(vp, v_freelist), vp->v_freelist.tqe_prev, 770 vp->v_mount); 771 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %ld, type %d\n", 772 TAILQ_FIRST(&vp->v_cleanblkhd), 773 TAILQ_FIRST(&vp->v_dirtyblkhd), 774 vp->v_numoutput, vp->v_type); 775 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 776 vp->v_socket, vp->v_tag, 777 ((u_int *)vp->v_data)[0], 778 ((u_int *)vp->v_data)[1]); 779 } 780#endif 781 error = VOP_CLOSE(pmp->pm_devvp, 782 (pmp->pm_flags&MSDOSFSMNT_RONLY) ? FREAD : FREAD | FWRITE, 783 NOCRED, p); 784 vrele(pmp->pm_devvp); 785 free(pmp->pm_inusemap, M_MSDOSFSFAT); 786 free(pmp, M_MSDOSFSMNT); 787 mp->mnt_data = (qaddr_t)0; 788 mp->mnt_flag &= ~MNT_LOCAL; 789 return (error); 790} 791 792static int 793msdosfs_root(mp, vpp) 794 struct mount *mp; 795 struct vnode **vpp; 796{ 797 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 798 struct denode *ndep; 799 int error; 800 801#ifdef MSDOSFS_DEBUG 802 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 803#endif 804 error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep); 805 if (error) 806 return (error); 807 *vpp = DETOV(ndep); 808 return (0); 809} 810 811static int 812msdosfs_statfs(mp, sbp, p) 813 struct mount *mp; 814 struct statfs *sbp; 815 struct proc *p; 816{ 817 struct msdosfsmount *pmp; 818 819 pmp = VFSTOMSDOSFS(mp); 820 sbp->f_bsize = pmp->pm_bpcluster; 821 sbp->f_iosize = pmp->pm_bpcluster; 822 sbp->f_blocks = pmp->pm_maxcluster + 1; 823 sbp->f_bfree = pmp->pm_freeclustercount; 824 sbp->f_bavail = pmp->pm_freeclustercount; 825 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 826 sbp->f_ffree = 0; /* what to put in here? */ 827 if (sbp != &mp->mnt_stat) { 828 sbp->f_type = mp->mnt_vfc->vfc_typenum; 829 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 830 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 831 } 832 strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN); 833 return (0); 834} 835 836static int 837msdosfs_sync(mp, waitfor, cred, p) 838 struct mount *mp; 839 int waitfor; 840 struct ucred *cred; 841 struct proc *p; 842{ 843 struct vnode *vp, *nvp; 844 struct denode *dep; 845 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 846 int error, allerror = 0; 847 848 /* 849 * If we ever switch to not updating all of the fats all the time, 850 * this would be the place to update them from the first one. 851 */ 852 if (pmp->pm_fmod != 0) { 853 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 854 panic("msdosfs_sync: rofs mod"); 855 else { 856 /* update fats here */ 857 } 858 } 859 /* 860 * Write back each (modified) denode. 861 */ 862 mtx_lock(&mntvnode_mtx); 863loop: 864 for (vp = LIST_FIRST(&mp->mnt_vnodelist); vp != NULL; vp = nvp) { 865 /* 866 * If the vnode that we are about to sync is no longer 867 * associated with this mount point, start over. 868 */ 869 if (vp->v_mount != mp) 870 goto loop; 871 872 mtx_lock(&vp->v_interlock); 873 nvp = LIST_NEXT(vp, v_mntvnodes); 874 dep = VTODE(vp); 875 if (vp->v_type == VNON || 876 ((dep->de_flag & 877 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 && 878 (TAILQ_EMPTY(&vp->v_dirtyblkhd) || waitfor == MNT_LAZY))) { 879 mtx_unlock(&vp->v_interlock); 880 continue; 881 } 882 mtx_unlock(&mntvnode_mtx); 883 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, p); 884 if (error) { 885 mtx_lock(&mntvnode_mtx); 886 if (error == ENOENT) 887 goto loop; 888 continue; 889 } 890 error = VOP_FSYNC(vp, cred, waitfor, p); 891 if (error) 892 allerror = error; 893 VOP_UNLOCK(vp, 0, p); 894 vrele(vp); 895 mtx_lock(&mntvnode_mtx); 896 } 897 mtx_unlock(&mntvnode_mtx); 898 899 /* 900 * Flush filesystem control info. 901 */ 902 if (waitfor != MNT_LAZY) { 903 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY, p); 904 error = VOP_FSYNC(pmp->pm_devvp, cred, waitfor, p); 905 if (error) 906 allerror = error; 907 VOP_UNLOCK(pmp->pm_devvp, 0, p); 908 } 909 return (allerror); 910} 911 912static int 913msdosfs_fhtovp(mp, fhp, vpp) 914 struct mount *mp; 915 struct fid *fhp; 916 struct vnode **vpp; 917{ 918 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 919 struct defid *defhp = (struct defid *) fhp; 920 struct denode *dep; 921 int error; 922 923 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 924 if (error) { 925 *vpp = NULLVP; 926 return (error); 927 } 928 *vpp = DETOV(dep); 929 return (0); 930} 931 932static int 933msdosfs_vptofh(vp, fhp) 934 struct vnode *vp; 935 struct fid *fhp; 936{ 937 struct denode *dep; 938 struct defid *defhp; 939 940 dep = VTODE(vp); 941 defhp = (struct defid *)fhp; 942 defhp->defid_len = sizeof(struct defid); 943 defhp->defid_dirclust = dep->de_dirclust; 944 defhp->defid_dirofs = dep->de_diroffset; 945 /* defhp->defid_gen = dep->de_gen; */ 946 return (0); 947} 948 949static struct vfsops msdosfs_vfsops = { 950 msdosfs_mount, 951 vfs_stdstart, 952 msdosfs_unmount, 953 msdosfs_root, 954 vfs_stdquotactl, 955 msdosfs_statfs, 956 msdosfs_sync, 957 vfs_stdvget, 958 msdosfs_fhtovp, 959 vfs_stdcheckexp, 960 msdosfs_vptofh, 961 msdosfs_init, 962 msdosfs_uninit, 963 vfs_stdextattrctl, 964}; 965 966VFS_SET(msdosfs_vfsops, msdos, 0); 967