msdosfs_vfsops.c revision 86037
1/* $FreeBSD: head/sys/fs/msdosfs/msdosfs_vfsops.c 86037 2001-11-04 18:55:42Z dillon $ */ 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 <sys/mount.h> 59#include <sys/bio.h> 60#include <sys/buf.h> 61#include <sys/fcntl.h> 62#include <sys/malloc.h> 63#include <sys/stat.h> /* defines ALLPERMS */ 64#include <sys/mutex.h> 65 66#include <fs/msdosfs/bpb.h> 67#include <fs/msdosfs/bootsect.h> 68#include <fs/msdosfs/direntry.h> 69#include <fs/msdosfs/denode.h> 70#include <fs/msdosfs/msdosfsmount.h> 71#include <fs/msdosfs/fat.h> 72 73#define MSDOSFS_DFLTBSIZE 4096 74 75#if 1 /*def PC98*/ 76/* 77 * XXX - The boot signature formatted by NEC PC-98 DOS looks like a 78 * garbage or a random value :-{ 79 * If you want to use that broken-signatured media, define the 80 * following symbol even though PC/AT. 81 * (ex. mount PC-98 DOS formatted FD on PC/AT) 82 */ 83#define MSDOSFS_NOCHECKSIG 84#endif 85 86MALLOC_DEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOSFS mount structure"); 87static MALLOC_DEFINE(M_MSDOSFSFAT, "MSDOSFS FAT", "MSDOSFS file allocation table"); 88 89static int update_mp __P((struct mount *mp, struct msdosfs_args *argp)); 90static int mountmsdosfs __P((struct vnode *devvp, struct mount *mp, 91 struct thread *td, struct msdosfs_args *argp)); 92static int msdosfs_fhtovp __P((struct mount *, struct fid *, 93 struct vnode **)); 94static int msdosfs_mount __P((struct mount *, char *, caddr_t, 95 struct nameidata *, struct thread *)); 96static int msdosfs_root __P((struct mount *, struct vnode **)); 97static int msdosfs_statfs __P((struct mount *, struct statfs *, 98 struct thread *)); 99static int msdosfs_sync __P((struct mount *, int, struct ucred *, 100 struct thread *)); 101static int msdosfs_unmount __P((struct mount *, int, struct thread *)); 102static int msdosfs_vptofh __P((struct vnode *, struct fid *)); 103 104static int 105update_mp(mp, argp) 106 struct mount *mp; 107 struct msdosfs_args *argp; 108{ 109 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 110 int error; 111 112 pmp->pm_gid = argp->gid; 113 pmp->pm_uid = argp->uid; 114 pmp->pm_mask = argp->mask & ALLPERMS; 115 pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT; 116 if (pmp->pm_flags & MSDOSFSMNT_U2WTABLE) { 117 bcopy(argp->u2w, pmp->pm_u2w, sizeof(pmp->pm_u2w)); 118 bcopy(argp->d2u, pmp->pm_d2u, sizeof(pmp->pm_d2u)); 119 bcopy(argp->u2d, pmp->pm_u2d, sizeof(pmp->pm_u2d)); 120 } 121 if (pmp->pm_flags & MSDOSFSMNT_ULTABLE) { 122 bcopy(argp->ul, pmp->pm_ul, sizeof(pmp->pm_ul)); 123 bcopy(argp->lu, pmp->pm_lu, sizeof(pmp->pm_lu)); 124 } 125 126#ifndef __FreeBSD__ 127 /* 128 * GEMDOS knows nothing (yet) about win95 129 */ 130 if (pmp->pm_flags & MSDOSFSMNT_GEMDOSFS) 131 pmp->pm_flags |= MSDOSFSMNT_NOWIN95; 132#endif 133 134 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 135 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 136 else if (!(pmp->pm_flags & 137 (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 138 struct vnode *rootvp; 139 140 /* 141 * Try to divine whether to support Win'95 long filenames 142 */ 143 if (FAT32(pmp)) 144 pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 145 else { 146 if ((error = msdosfs_root(mp, &rootvp)) != 0) 147 return error; 148 pmp->pm_flags |= findwin95(VTODE(rootvp)) 149 ? MSDOSFSMNT_LONGNAME 150 : MSDOSFSMNT_SHORTNAME; 151 vput(rootvp); 152 } 153 } 154 return 0; 155} 156 157#ifndef __FreeBSD__ 158int 159msdosfs_mountroot() 160{ 161 register struct mount *mp; 162 struct thread *td = curthread; /* XXX */ 163 size_t size; 164 int error; 165 struct msdosfs_args args; 166 167 if (root_device->dv_class != DV_DISK) 168 return (ENODEV); 169 170 /* 171 * Get vnodes for swapdev and rootdev. 172 */ 173 if (bdevvp(rootdev, &rootvp)) 174 panic("msdosfs_mountroot: can't setup rootvp"); 175 176 mp = malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK | M_ZERO); 177 mp->mnt_op = &msdosfs_vfsops; 178 mp->mnt_flag = 0; 179 TAILQ_INIT(&mp->mnt_nvnodelist); 180 TAILQ_INIT(&mp->mnt_reservedvnlist); 181 182 args.flags = 0; 183 args.uid = 0; 184 args.gid = 0; 185 args.mask = 0777; 186 187 if ((error = mountmsdosfs(rootvp, mp, p, &args)) != 0) { 188 free(mp, M_MOUNT); 189 return (error); 190 } 191 192 if ((error = update_mp(mp, &args)) != 0) { 193 (void)msdosfs_unmount(mp, 0, td); 194 free(mp, M_MOUNT); 195 return (error); 196 } 197 198 if ((error = vfs_lock(mp)) != 0) { 199 (void)msdosfs_unmount(mp, 0, td); 200 free(mp, M_MOUNT); 201 return (error); 202 } 203 204 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 205 mp->mnt_vnodecovered = NULLVP; 206 (void) copystr("/", mp->mnt_stat.f_mntonname, MNAMELEN - 1, 207 &size); 208 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); 209 (void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 210 &size); 211 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 212 (void)msdosfs_statfs(mp, &mp->mnt_stat, td); 213 vfs_unlock(mp); 214 return (0); 215} 216#endif 217 218/* 219 * mp - path - addr in user space of mount point (ie /usr or whatever) 220 * data - addr in user space of mount params including the name of the block 221 * special file to treat as a filesystem. 222 */ 223static int 224msdosfs_mount(mp, path, data, ndp, td) 225 struct mount *mp; 226 char *path; 227 caddr_t data; 228 struct nameidata *ndp; 229 struct thread *td; 230{ 231 struct vnode *devvp; /* vnode for blk device to mount */ 232 struct msdosfs_args args; /* will hold data from mount request */ 233 /* msdosfs specific mount control block */ 234 struct msdosfsmount *pmp = NULL; 235 size_t size; 236 int error, flags; 237 mode_t accessmode; 238 239 error = copyin(data, (caddr_t)&args, sizeof(struct msdosfs_args)); 240 if (error) 241 return (error); 242 if (args.magic != MSDOSFS_ARGSMAGIC) 243 args.flags = 0; 244 /* 245 * If updating, check whether changing from read-only to 246 * read/write; if there is no device name, that's all we do. 247 */ 248 if (mp->mnt_flag & MNT_UPDATE) { 249 pmp = VFSTOMSDOSFS(mp); 250 error = 0; 251 if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_RDONLY)) { 252 flags = WRITECLOSE; 253 if (mp->mnt_flag & MNT_FORCE) 254 flags |= FORCECLOSE; 255 error = vflush(mp, 0, flags); 256 } 257 if (!error && (mp->mnt_flag & MNT_RELOAD)) 258 /* not yet implemented */ 259 error = EOPNOTSUPP; 260 if (error) 261 return (error); 262 if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_kern_flag & MNTK_WANTRDWR)) { 263 /* 264 * If upgrade to read-write by non-root, then verify 265 * that user has necessary permissions on the device. 266 */ 267 if (td->td_proc->p_ucred->cr_uid != 0) { 268 devvp = pmp->pm_devvp; 269 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 270 error = VOP_ACCESS(devvp, VREAD | VWRITE, 271 td->td_proc->p_ucred, td); 272 if (error) { 273 VOP_UNLOCK(devvp, 0, td); 274 return (error); 275 } 276 VOP_UNLOCK(devvp, 0, td); 277 } 278 pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 279 } 280 if (args.fspec == 0) { 281#ifdef __notyet__ /* doesn't work correctly with current mountd XXX */ 282 if (args.flags & MSDOSFSMNT_MNTOPT) { 283 pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT; 284 pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT; 285 if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 286 pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 287 } 288#endif 289 /* 290 * Process export requests. 291 */ 292 return (vfs_export(mp, &args.export)); 293 } 294 } 295 /* 296 * Not an update, or updating the name: look up the name 297 * and verify that it refers to a sensible block device. 298 */ 299 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, td); 300 error = namei(ndp); 301 if (error) 302 return (error); 303 devvp = ndp->ni_vp; 304 NDFREE(ndp, NDF_ONLY_PNBUF); 305 306 if (!vn_isdisk(devvp, &error)) { 307 vrele(devvp); 308 return (error); 309 } 310 /* 311 * If mount by non-root, then verify that user has necessary 312 * permissions on the device. 313 */ 314 if (td->td_proc->p_ucred->cr_uid != 0) { 315 accessmode = VREAD; 316 if ((mp->mnt_flag & MNT_RDONLY) == 0) 317 accessmode |= VWRITE; 318 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 319 error = VOP_ACCESS(devvp, accessmode, td->td_proc->p_ucred, td); 320 if (error) { 321 vput(devvp); 322 return (error); 323 } 324 VOP_UNLOCK(devvp, 0, td); 325 } 326 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 327 error = mountmsdosfs(devvp, mp, td, &args); 328#ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 329 pmp = VFSTOMSDOSFS(mp); 330#endif 331 } else { 332 if (devvp != pmp->pm_devvp) 333 error = EINVAL; /* XXX needs translation */ 334 else 335 vrele(devvp); 336 } 337 if (error) { 338 vrele(devvp); 339 return (error); 340 } 341 342 error = update_mp(mp, &args); 343 if (error) { 344 msdosfs_unmount(mp, MNT_FORCE, td); 345 return error; 346 } 347 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 348 &size); 349 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 350 (void) msdosfs_statfs(mp, &mp->mnt_stat, td); 351#ifdef MSDOSFS_DEBUG 352 printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 353#endif 354 return (0); 355} 356 357static int 358mountmsdosfs(devvp, mp, td, argp) 359 struct vnode *devvp; 360 struct mount *mp; 361 struct thread *td; 362 struct msdosfs_args *argp; 363{ 364 struct msdosfsmount *pmp; 365 struct buf *bp; 366 dev_t dev = devvp->v_rdev; 367#ifndef __FreeBSD__ 368 struct partinfo dpart; 369 int bsize = 0, dtype = 0, tmp; 370#endif 371 union bootsector *bsp; 372 struct byte_bpb33 *b33; 373 struct byte_bpb50 *b50; 374 struct byte_bpb710 *b710; 375 u_int8_t SecPerClust; 376 u_long clusters; 377 int ronly, error; 378 379 /* 380 * Disallow multiple mounts of the same device. 381 * Disallow mounting of a device that is currently in use 382 * (except for root, which might share swap device for miniroot). 383 * Flush out any old buffers remaining from a previous use. 384 */ 385 error = vfs_mountedon(devvp); 386 if (error) 387 return (error); 388 if (vcount(devvp) > 1 && devvp != rootvp) 389 return (EBUSY); 390 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 391 error = vinvalbuf(devvp, V_SAVE, td->td_proc->p_ucred, td, 0, 0); 392 VOP_UNLOCK(devvp, 0, td); 393 if (error) 394 return (error); 395 396 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 397 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 398 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, td); 399 VOP_UNLOCK(devvp, 0, td); 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, td); 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 * NOTE: 2048 is a maximum sector size in current... 437 */ 438 error = bread(devvp, 0, 2048, NOCRED, &bp); 439 if (error) 440 goto error_exit; 441 bp->b_flags |= B_AGE; 442 bsp = (union bootsector *)bp->b_data; 443 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 444 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 445 b710 = (struct byte_bpb710 *)bsp->bs710.bsPBP; 446 447#ifndef __FreeBSD__ 448 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 449#endif 450#ifndef MSDOSFS_NOCHECKSIG 451 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 452 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 453 error = EINVAL; 454 goto error_exit; 455 } 456#endif 457#ifndef __FreeBSD__ 458 } 459#endif 460 461 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK | M_ZERO); 462 pmp->pm_mountp = mp; 463 464 /* 465 * Compute several useful quantities from the bpb in the 466 * bootsector. Copy in the dos 5 variant of the bpb then fix up 467 * the fields that are different between dos 5 and dos 3.3. 468 */ 469 SecPerClust = b50->bpbSecPerClust; 470 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 471 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 472 pmp->pm_FATs = b50->bpbFATs; 473 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 474 pmp->pm_Sectors = getushort(b50->bpbSectors); 475 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 476 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 477 pmp->pm_Heads = getushort(b50->bpbHeads); 478 pmp->pm_Media = b50->bpbMedia; 479 480 /* calculate the ratio of sector size to DEV_BSIZE */ 481 pmp->pm_BlkPerSec = pmp->pm_BytesPerSec / DEV_BSIZE; 482 483#ifndef __FreeBSD__ 484 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 485#endif 486 /* XXX - We should probably check more values here */ 487 if (!pmp->pm_BytesPerSec || !SecPerClust 488 || !pmp->pm_Heads || pmp->pm_Heads > 255 489#ifdef PC98 490 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 255) { 491#else 492 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 63) { 493#endif 494 error = EINVAL; 495 goto error_exit; 496 } 497#ifndef __FreeBSD__ 498 } 499#endif 500 501 if (pmp->pm_Sectors == 0) { 502 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 503 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 504 } else { 505 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 506 pmp->pm_HugeSectors = pmp->pm_Sectors; 507 } 508 if (pmp->pm_HugeSectors > 0xffffffff / 509 (pmp->pm_BytesPerSec / sizeof(struct direntry)) + 1) { 510 /* 511 * We cannot deal currently with this size of disk 512 * due to fileid limitations (see msdosfs_getattr and 513 * msdosfs_readdir) 514 */ 515 error = EINVAL; 516 printf("mountmsdosfs(): disk too big, sorry\n"); 517 goto error_exit; 518 } 519 520 if (pmp->pm_RootDirEnts == 0) { 521 if (bsp->bs710.bsBootSectSig2 != BOOTSIG2 522 || bsp->bs710.bsBootSectSig3 != BOOTSIG3 523 || pmp->pm_Sectors 524 || pmp->pm_FATsecs 525 || getushort(b710->bpbFSVers)) { 526 error = EINVAL; 527 printf("mountmsdosfs(): bad FAT32 filesystem\n"); 528 goto error_exit; 529 } 530 pmp->pm_fatmask = FAT32_MASK; 531 pmp->pm_fatmult = 4; 532 pmp->pm_fatdiv = 1; 533 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 534 if (getushort(b710->bpbExtFlags) & FATMIRROR) 535 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 536 else 537 pmp->pm_flags |= MSDOSFS_FATMIRROR; 538 } else 539 pmp->pm_flags |= MSDOSFS_FATMIRROR; 540 541 /* 542 * Check a few values (could do some more): 543 * - logical sector size: power of 2, >= block size 544 * - sectors per cluster: power of 2, >= 1 545 * - number of sectors: >= 1, <= size of partition 546 */ 547 if ( (SecPerClust == 0) 548 || (SecPerClust & (SecPerClust - 1)) 549 || (pmp->pm_BytesPerSec < DEV_BSIZE) 550 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 551 || (pmp->pm_HugeSectors == 0) 552 ) { 553 error = EINVAL; 554 goto error_exit; 555 } 556 557 pmp->pm_HugeSectors *= pmp->pm_BlkPerSec; 558 pmp->pm_HiddenSects *= pmp->pm_BlkPerSec; /* XXX not used? */ 559 pmp->pm_FATsecs *= pmp->pm_BlkPerSec; 560 SecPerClust *= pmp->pm_BlkPerSec; 561 562 pmp->pm_fatblk = pmp->pm_ResSectors * pmp->pm_BlkPerSec; 563 564 if (FAT32(pmp)) { 565 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 566 pmp->pm_firstcluster = pmp->pm_fatblk 567 + (pmp->pm_FATs * pmp->pm_FATsecs); 568 pmp->pm_fsinfo = getushort(b710->bpbFSInfo) * pmp->pm_BlkPerSec; 569 } else { 570 pmp->pm_rootdirblk = pmp->pm_fatblk + 571 (pmp->pm_FATs * pmp->pm_FATsecs); 572 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 573 + DEV_BSIZE - 1) 574 / DEV_BSIZE; /* in blocks */ 575 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 576 } 577 578 pmp->pm_maxcluster = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 579 SecPerClust + 1; 580 pmp->pm_fatsize = pmp->pm_FATsecs * DEV_BSIZE; /* XXX not used? */ 581 582#ifndef __FreeBSD__ 583 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 584 if ((pmp->pm_maxcluster <= (0xff0 - 2)) 585 && ((dtype == DTYPE_FLOPPY) || ((dtype == DTYPE_VNODE) 586 && ((pmp->pm_Heads == 1) || (pmp->pm_Heads == 2)))) 587 ) { 588 pmp->pm_fatmask = FAT12_MASK; 589 pmp->pm_fatmult = 3; 590 pmp->pm_fatdiv = 2; 591 } else { 592 pmp->pm_fatmask = FAT16_MASK; 593 pmp->pm_fatmult = 2; 594 pmp->pm_fatdiv = 1; 595 } 596 } else 597#endif 598 if (pmp->pm_fatmask == 0) { 599 if (pmp->pm_maxcluster 600 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 601 /* 602 * This will usually be a floppy disk. This size makes 603 * sure that one fat entry will not be split across 604 * multiple blocks. 605 */ 606 pmp->pm_fatmask = FAT12_MASK; 607 pmp->pm_fatmult = 3; 608 pmp->pm_fatdiv = 2; 609 } else { 610 pmp->pm_fatmask = FAT16_MASK; 611 pmp->pm_fatmult = 2; 612 pmp->pm_fatdiv = 1; 613 } 614 } 615 616 clusters = (pmp->pm_fatsize / pmp->pm_fatmult) * pmp->pm_fatdiv; 617 if (pmp->pm_maxcluster >= clusters) { 618 printf("Warning: number of clusters (%ld) exceeds FAT " 619 "capacity (%ld)\n", pmp->pm_maxcluster + 1, clusters); 620 pmp->pm_maxcluster = clusters - 1; 621 } 622 623 624 if (FAT12(pmp)) 625 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 626 else 627 pmp->pm_fatblocksize = MSDOSFS_DFLTBSIZE; 628 629 pmp->pm_fatblocksec = pmp->pm_fatblocksize / DEV_BSIZE; 630 pmp->pm_bnshift = ffs(DEV_BSIZE) - 1; 631 632 /* 633 * Compute mask and shift value for isolating cluster relative byte 634 * offsets and cluster numbers from a file offset. 635 */ 636 pmp->pm_bpcluster = SecPerClust * DEV_BSIZE; 637 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 638 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 639 640 /* 641 * Check for valid cluster size 642 * must be a power of 2 643 */ 644 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 645 error = EINVAL; 646 goto error_exit; 647 } 648 649 /* 650 * Release the bootsector buffer. 651 */ 652 brelse(bp); 653 bp = NULL; 654 655 /* 656 * Check FSInfo. 657 */ 658 if (pmp->pm_fsinfo) { 659 struct fsinfo *fp; 660 661 if ((error = bread(devvp, pmp->pm_fsinfo, fsi_size(pmp), 662 NOCRED, &bp)) != 0) 663 goto error_exit; 664 fp = (struct fsinfo *)bp->b_data; 665 if (!bcmp(fp->fsisig1, "RRaA", 4) 666 && !bcmp(fp->fsisig2, "rrAa", 4) 667 && !bcmp(fp->fsisig3, "\0\0\125\252", 4) 668 && !bcmp(fp->fsisig4, "\0\0\125\252", 4)) 669 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 670 else 671 pmp->pm_fsinfo = 0; 672 brelse(bp); 673 bp = NULL; 674 } 675 676 /* 677 * Check and validate (or perhaps invalidate?) the fsinfo structure? XXX 678 */ 679 680 /* 681 * Allocate memory for the bitmap of allocated clusters, and then 682 * fill it in. 683 */ 684 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 685 / N_INUSEBITS) 686 * sizeof(*pmp->pm_inusemap), 687 M_MSDOSFSFAT, M_WAITOK); 688 689 /* 690 * fillinusemap() needs pm_devvp. 691 */ 692 pmp->pm_dev = dev; 693 pmp->pm_devvp = devvp; 694 695 /* 696 * Have the inuse map filled in. 697 */ 698 if ((error = fillinusemap(pmp)) != 0) 699 goto error_exit; 700 701 /* 702 * If they want fat updates to be synchronous then let them suffer 703 * the performance degradation in exchange for the on disk copy of 704 * the fat being correct just about all the time. I suppose this 705 * would be a good thing to turn on if the kernel is still flakey. 706 */ 707 if (mp->mnt_flag & MNT_SYNCHRONOUS) 708 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 709 710 /* 711 * Finish up. 712 */ 713 if (ronly) 714 pmp->pm_flags |= MSDOSFSMNT_RONLY; 715 else 716 pmp->pm_fmod = 1; 717 mp->mnt_data = (qaddr_t) pmp; 718 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 719 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 720 mp->mnt_flag |= MNT_LOCAL; 721 devvp->v_rdev->si_mountpoint = mp; 722 723 return 0; 724 725error_exit: 726 if (bp) 727 brelse(bp); 728 (void) VOP_CLOSE(devvp, ronly ? FREAD : FREAD | FWRITE, NOCRED, td); 729 if (pmp) { 730 if (pmp->pm_inusemap) 731 free(pmp->pm_inusemap, M_MSDOSFSFAT); 732 free(pmp, M_MSDOSFSMNT); 733 mp->mnt_data = (qaddr_t)0; 734 } 735 return (error); 736} 737 738/* 739 * Unmount the filesystem described by mp. 740 */ 741static int 742msdosfs_unmount(mp, mntflags, td) 743 struct mount *mp; 744 int mntflags; 745 struct thread *td; 746{ 747 struct msdosfsmount *pmp; 748 int error, flags; 749 750 flags = 0; 751 if (mntflags & MNT_FORCE) 752 flags |= FORCECLOSE; 753 error = vflush(mp, 0, flags); 754 if (error) 755 return error; 756 pmp = VFSTOMSDOSFS(mp); 757 pmp->pm_devvp->v_rdev->si_mountpoint = NULL; 758#ifdef MSDOSFS_DEBUG 759 { 760 struct vnode *vp = pmp->pm_devvp; 761 762 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 763 printf("flag %08lx, usecount %d, writecount %d, holdcnt %ld\n", 764 vp->v_flag, vp->v_usecount, vp->v_writecount, vp->v_holdcnt); 765 printf("id %lu, mount %p, op %p\n", 766 vp->v_id, vp->v_mount, vp->v_op); 767 printf("freef %p, freeb %p, mount %p\n", 768 TAILQ_NEXT(vp, v_freelist), vp->v_freelist.tqe_prev, 769 vp->v_mount); 770 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %ld, type %d\n", 771 TAILQ_FIRST(&vp->v_cleanblkhd), 772 TAILQ_FIRST(&vp->v_dirtyblkhd), 773 vp->v_numoutput, vp->v_type); 774 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 775 vp->v_socket, vp->v_tag, 776 ((u_int *)vp->v_data)[0], 777 ((u_int *)vp->v_data)[1]); 778 } 779#endif 780 error = VOP_CLOSE(pmp->pm_devvp, 781 (pmp->pm_flags&MSDOSFSMNT_RONLY) ? FREAD : FREAD | FWRITE, 782 NOCRED, td); 783 vrele(pmp->pm_devvp); 784 free(pmp->pm_inusemap, M_MSDOSFSFAT); 785 free(pmp, M_MSDOSFSMNT); 786 mp->mnt_data = (qaddr_t)0; 787 mp->mnt_flag &= ~MNT_LOCAL; 788 return (error); 789} 790 791static int 792msdosfs_root(mp, vpp) 793 struct mount *mp; 794 struct vnode **vpp; 795{ 796 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 797 struct denode *ndep; 798 int error; 799 800#ifdef MSDOSFS_DEBUG 801 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 802#endif 803 error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep); 804 if (error) 805 return (error); 806 *vpp = DETOV(ndep); 807 return (0); 808} 809 810static int 811msdosfs_statfs(mp, sbp, td) 812 struct mount *mp; 813 struct statfs *sbp; 814 struct thread *td; 815{ 816 struct msdosfsmount *pmp; 817 818 pmp = VFSTOMSDOSFS(mp); 819 sbp->f_bsize = pmp->pm_bpcluster; 820 sbp->f_iosize = pmp->pm_bpcluster; 821 sbp->f_blocks = pmp->pm_maxcluster + 1; 822 sbp->f_bfree = pmp->pm_freeclustercount; 823 sbp->f_bavail = pmp->pm_freeclustercount; 824 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 825 sbp->f_ffree = 0; /* what to put in here? */ 826 if (sbp != &mp->mnt_stat) { 827 sbp->f_type = mp->mnt_vfc->vfc_typenum; 828 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 829 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 830 } 831 strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN); 832 return (0); 833} 834 835static int 836msdosfs_sync(mp, waitfor, cred, td) 837 struct mount *mp; 838 int waitfor; 839 struct ucred *cred; 840 struct thread *td; 841{ 842 struct vnode *vp, *nvp; 843 struct denode *dep; 844 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 845 int error, allerror = 0; 846 847 /* 848 * If we ever switch to not updating all of the fats all the time, 849 * this would be the place to update them from the first one. 850 */ 851 if (pmp->pm_fmod != 0) { 852 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 853 panic("msdosfs_sync: rofs mod"); 854 else { 855 /* update fats here */ 856 } 857 } 858 /* 859 * Write back each (modified) denode. 860 */ 861 mtx_lock(&mntvnode_mtx); 862loop: 863 for (vp = TAILQ_FIRST(&mp->mnt_nvnodelist); vp != NULL; vp = nvp) { 864 /* 865 * If the vnode that we are about to sync is no longer 866 * associated with this mount point, start over. 867 */ 868 if (vp->v_mount != mp) 869 goto loop; 870 nvp = TAILQ_NEXT(vp, v_nmntvnodes); 871 872 mtx_unlock(&mntvnode_mtx); 873 mtx_lock(&vp->v_interlock); 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 mtx_lock(&mntvnode_mtx); 881 continue; 882 } 883 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td); 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, td); 891 if (error) 892 allerror = error; 893 VOP_UNLOCK(vp, 0, td); 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, td); 904 error = VOP_FSYNC(pmp->pm_devvp, cred, waitfor, td); 905 if (error) 906 allerror = error; 907 VOP_UNLOCK(pmp->pm_devvp, 0, td); 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, msdosfs, 0); 967