msdosfs_vfsops.c revision 71576
14273SN/A/* $FreeBSD: head/sys/fs/msdosfs/msdosfs_vfsops.c 71576 2001-01-24 12:35:55Z jasone $ */ 217519Sapetcher/* $NetBSD: msdosfs_vfsops.c,v 1.51 1997/11/17 15:36:58 ws Exp $ */ 34273SN/A 44273SN/A/*- 54273SN/A * Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank. 64273SN/A * Copyright (C) 1994, 1995, 1997 TooLs GmbH. 74273SN/A * All rights reserved. 84273SN/A * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below). 91674SN/A * 104273SN/A * Redistribution and use in source and binary forms, with or without 114273SN/A * modification, are permitted provided that the following conditions 124273SN/A * are met: 134273SN/A * 1. Redistributions of source code must retain the above copyright 141674SN/A * notice, this list of conditions and the following disclaimer. 154273SN/A * 2. Redistributions in binary form must reproduce the above copyright 164273SN/A * notice, this list of conditions and the following disclaimer in the 174273SN/A * documentation and/or other materials provided with the distribution. 181674SN/A * 3. All advertising materials mentioning features or use of this software 194273SN/A * must display the following acknowledgement: 204273SN/A * This product includes software developed by TooLs GmbH. 214273SN/A * 4. The name of TooLs GmbH may not be used to endorse or promote products 224273SN/A * derived from this software without specific prior written permission. 234273SN/A * 244273SN/A * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 251674SN/A * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 261674SN/A * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 271674SN/A * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 281674SN/A * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 291674SN/A * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 301674SN/A * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 311674SN/A * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 321674SN/A * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 331674SN/A * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 341674SN/A */ 351674SN/A/* 3617519Sapetcher * Written by Paul Popelka (paulp@uts.amdahl.com) 371674SN/A * 381674SN/A * You can do anything you want with this software, just don't say you wrote 391674SN/A * it, and don't remove this notice. 401674SN/A * 411674SN/A * This software is provided "as is". 421674SN/A * 431674SN/A * The author supplies this software to be publicly redistributed on the 441674SN/A * understanding that the author is not responsible for the correct 451674SN/A * functioning of this software in any circumstances and is not liable for 461674SN/A * any damages caused by this software. 471674SN/A * 481674SN/A * October 1992 491674SN/A */ 501674SN/A 511674SN/A#include <sys/param.h> 521674SN/A#include <sys/systm.h> 5317519Sapetcher#include <sys/conf.h> 5417519Sapetcher#include <sys/namei.h> 551674SN/A#include <sys/proc.h> 561674SN/A#include <sys/kernel.h> 571674SN/A#include <sys/vnode.h> 581674SN/A#include <sys/mount.h> 591674SN/A#include <sys/bio.h> 601674SN/A#include <sys/buf.h> 611674SN/A#include <sys/fcntl.h> 621674SN/A#include <sys/malloc.h> 631674SN/A#include <sys/stat.h> /* defines ALLPERMS */ 641674SN/A#include <sys/mutex.h> 651674SN/A 661674SN/A#include <msdosfs/bpb.h> 671674SN/A#include <msdosfs/bootsect.h> 681674SN/A#include <msdosfs/direntry.h> 691674SN/A#include <msdosfs/denode.h> 701674SN/A#include <msdosfs/msdosfsmount.h> 711674SN/A#include <msdosfs/fat.h> 721674SN/A 731674SN/A#define MSDOSFS_DFLTBSIZE 4096 741674SN/A 751674SN/A#if 1 /*def PC98*/ 761674SN/A/* 7716229Sgoetz * XXX - The boot signature formatted by NEC PC-98 DOS looks like a 781674SN/A * garbage or a random value :-{ 791674SN/A * If you want to use that broken-signatured media, define the 8017519Sapetcher * following symbol even though PC/AT. 811674SN/A * (ex. mount PC-98 DOS formatted FD on PC/AT) 821674SN/A */ 831674SN/A#define MSDOSFS_NOCHECKSIG 841674SN/A#endif 851674SN/A 8617519SapetcherMALLOC_DEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOSFS mount structure"); 871674SN/Astatic MALLOC_DEFINE(M_MSDOSFSFAT, "MSDOSFS FAT", "MSDOSFS file allocation table"); 8816229Sgoetz 8917519Sapetcherstatic int update_mp __P((struct mount *mp, struct msdosfs_args *argp)); 901674SN/Astatic int mountmsdosfs __P((struct vnode *devvp, struct mount *mp, 911674SN/A struct proc *p, struct msdosfs_args *argp)); 921674SN/Astatic int msdosfs_fhtovp __P((struct mount *, struct fid *, 931674SN/A struct vnode **)); 941674SN/Astatic int msdosfs_checkexp __P((struct mount *, struct sockaddr *, 951674SN/A int *, struct ucred **)); 961674SN/Astatic int msdosfs_mount __P((struct mount *, char *, caddr_t, 971674SN/A struct nameidata *, struct proc *)); 981674SN/Astatic int msdosfs_root __P((struct mount *, struct vnode **)); 991674SN/Astatic int msdosfs_statfs __P((struct mount *, struct statfs *, 1001674SN/A struct proc *)); 1011674SN/Astatic int msdosfs_sync __P((struct mount *, int, struct ucred *, 1021674SN/A struct proc *)); 1031674SN/Astatic int msdosfs_unmount __P((struct mount *, int, struct proc *)); 1041674SN/Astatic int msdosfs_vptofh __P((struct vnode *, struct fid *)); 1051674SN/A 1061674SN/Astatic int 1071674SN/Aupdate_mp(mp, argp) 1081674SN/A struct mount *mp; 1091674SN/A struct msdosfs_args *argp; 1101674SN/A{ 11117519Sapetcher struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 1121674SN/A int error; 1131674SN/A 1141674SN/A pmp->pm_gid = argp->gid; 1151674SN/A pmp->pm_uid = argp->uid; 1161674SN/A pmp->pm_mask = argp->mask & ALLPERMS; 1171674SN/A pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT; 1181674SN/A if (pmp->pm_flags & MSDOSFSMNT_U2WTABLE) { 1191674SN/A bcopy(argp->u2w, pmp->pm_u2w, sizeof(pmp->pm_u2w)); 1201674SN/A bcopy(argp->d2u, pmp->pm_d2u, sizeof(pmp->pm_d2u)); 1211674SN/A bcopy(argp->u2d, pmp->pm_u2d, sizeof(pmp->pm_u2d)); 1221674SN/A } 12317519Sapetcher if (pmp->pm_flags & MSDOSFSMNT_ULTABLE) { 1241674SN/A bcopy(argp->ul, pmp->pm_ul, sizeof(pmp->pm_ul)); 12517519Sapetcher bcopy(argp->lu, pmp->pm_lu, sizeof(pmp->pm_lu)); 1261674SN/A } 1271674SN/A 1281674SN/A#ifndef __FreeBSD__ 1291674SN/A /* 1301674SN/A * GEMDOS knows nothing (yet) about win95 1311674SN/A */ 1321674SN/A if (pmp->pm_flags & MSDOSFSMNT_GEMDOSFS) 13317519Sapetcher pmp->pm_flags |= MSDOSFSMNT_NOWIN95; 13417519Sapetcher#endif 1351674SN/A 1361674SN/A if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 1371674SN/A pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 1381674SN/A else if (!(pmp->pm_flags & 1391674SN/A (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) { 1401674SN/A struct vnode *rootvp; 1411674SN/A 1421674SN/A /* 1431674SN/A * Try to divine whether to support Win'95 long filenames 1441674SN/A */ 1451674SN/A if (FAT32(pmp)) 1461674SN/A pmp->pm_flags |= MSDOSFSMNT_LONGNAME; 1471674SN/A else { 1481674SN/A if ((error = msdosfs_root(mp, &rootvp)) != 0) 1491674SN/A return error; 1501674SN/A pmp->pm_flags |= findwin95(VTODE(rootvp)) 1511674SN/A ? MSDOSFSMNT_LONGNAME 1521674SN/A : MSDOSFSMNT_SHORTNAME; 1531674SN/A vput(rootvp); 1541674SN/A } 1551674SN/A } 1561674SN/A return 0; 1571674SN/A} 1581674SN/A 1591674SN/A#ifndef __FreeBSD__ 1601674SN/Aint 1611674SN/Amsdosfs_mountroot() 1621674SN/A{ 1631674SN/A register struct mount *mp; 1641674SN/A struct proc *p = curproc; /* XXX */ 1651674SN/A size_t size; 16617519Sapetcher int error; 1671674SN/A struct msdosfs_args args; 1681674SN/A 1691674SN/A if (root_device->dv_class != DV_DISK) 1701674SN/A return (ENODEV); 1711674SN/A 1721674SN/A /* 1731674SN/A * Get vnodes for swapdev and rootdev. 1741674SN/A */ 1751674SN/A if (bdevvp(rootdev, &rootvp)) 1761674SN/A panic("msdosfs_mountroot: can't setup rootvp"); 1771674SN/A 1781674SN/A mp = malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK | M_ZERO); 1791674SN/A mp->mnt_op = &msdosfs_vfsops; 1801674SN/A mp->mnt_flag = 0; 18117519Sapetcher LIST_INIT(&mp->mnt_vnodelist); 1821674SN/A 18317519Sapetcher args.flags = 0; 1841674SN/A args.uid = 0; 1851674SN/A args.gid = 0; 1861674SN/A args.mask = 0777; 1871674SN/A 1881674SN/A if ((error = mountmsdosfs(rootvp, mp, p, &args)) != 0) { 1891674SN/A free(mp, M_MOUNT); 1901674SN/A return (error); 1911674SN/A } 1921674SN/A 1931674SN/A if ((error = update_mp(mp, &args)) != 0) { 1941674SN/A (void)msdosfs_unmount(mp, 0, p); 1951674SN/A free(mp, M_MOUNT); 1961674SN/A return (error); 1971674SN/A } 1981674SN/A 1991674SN/A if ((error = vfs_lock(mp)) != 0) { 2001674SN/A (void)msdosfs_unmount(mp, 0, p); 2011674SN/A free(mp, M_MOUNT); 2021674SN/A return (error); 2031674SN/A } 2041674SN/A 2051674SN/A TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 2061674SN/A mp->mnt_vnodecovered = NULLVP; 2071674SN/A (void) copystr("/", mp->mnt_stat.f_mntonname, MNAMELEN - 1, 2081674SN/A &size); 2091674SN/A bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); 2101674SN/A (void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 2111674SN/A &size); 2121674SN/A bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 2131674SN/A (void)msdosfs_statfs(mp, &mp->mnt_stat, p); 2141674SN/A vfs_unlock(mp); 2151674SN/A return (0); 2161674SN/A} 2171674SN/A#endif 2181674SN/A 2191674SN/A/* 2201674SN/A * mp - path - addr in user space of mount point (ie /usr or whatever) 2211674SN/A * data - addr in user space of mount params including the name of the block 2221674SN/A * special file to treat as a filesystem. 2231674SN/A */ 2241674SN/Astatic int 2251674SN/Amsdosfs_mount(mp, path, data, ndp, p) 2261674SN/A struct mount *mp; 2271674SN/A char *path; 2281674SN/A caddr_t data; 2291674SN/A struct nameidata *ndp; 2301674SN/A struct proc *p; 2311674SN/A{ 2321674SN/A struct vnode *devvp; /* vnode for blk device to mount */ 2331674SN/A struct msdosfs_args args; /* will hold data from mount request */ 2341674SN/A /* msdosfs specific mount control block */ 2351674SN/A struct msdosfsmount *pmp = NULL; 2361674SN/A size_t size; 2371674SN/A int error, flags; 2381674SN/A mode_t accessmode; 2391674SN/A 2401674SN/A error = copyin(data, (caddr_t)&args, sizeof(struct msdosfs_args)); 2411674SN/A if (error) 2421674SN/A return (error); 2431674SN/A if (args.magic != MSDOSFS_ARGSMAGIC) 2441674SN/A args.flags = 0; 2451674SN/A /* 2461674SN/A * If updating, check whether changing from read-only to 2471674SN/A * read/write; if there is no device name, that's all we do. 2481674SN/A */ 2491674SN/A if (mp->mnt_flag & MNT_UPDATE) { 2501674SN/A pmp = VFSTOMSDOSFS(mp); 2511674SN/A error = 0; 2521674SN/A if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_RDONLY)) { 2531674SN/A flags = WRITECLOSE; 2541674SN/A if (mp->mnt_flag & MNT_FORCE) 2551674SN/A flags |= FORCECLOSE; 2561674SN/A error = vflush(mp, NULLVP, flags); 2571674SN/A } 2581674SN/A if (!error && (mp->mnt_flag & MNT_RELOAD)) 2591674SN/A /* not yet implemented */ 2601674SN/A error = EOPNOTSUPP; 2611674SN/A if (error) 2621674SN/A return (error); 2631674SN/A if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_kern_flag & MNTK_WANTRDWR)) { 2641674SN/A /* 2651674SN/A * If upgrade to read-write by non-root, then verify 2661674SN/A * that user has necessary permissions on the device. 2671674SN/A */ 2681674SN/A if (p->p_ucred->cr_uid != 0) { 2691674SN/A devvp = pmp->pm_devvp; 2701674SN/A vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p); 2711674SN/A error = VOP_ACCESS(devvp, VREAD | VWRITE, 2721674SN/A p->p_ucred, p); 2731674SN/A if (error) { 2741674SN/A VOP_UNLOCK(devvp, 0, p); 2751674SN/A return (error); 2761674SN/A } 2771674SN/A VOP_UNLOCK(devvp, 0, p); 2781674SN/A } 2791674SN/A pmp->pm_flags &= ~MSDOSFSMNT_RONLY; 2801674SN/A } 2811674SN/A if (args.fspec == 0) { 2821674SN/A#ifdef __notyet__ /* doesn't work correctly with current mountd XXX */ 2831674SN/A if (args.flags & MSDOSFSMNT_MNTOPT) { 2841674SN/A pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT; 2851674SN/A pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT; 2861674SN/A if (pmp->pm_flags & MSDOSFSMNT_NOWIN95) 2871674SN/A pmp->pm_flags |= MSDOSFSMNT_SHORTNAME; 2881674SN/A } 2891674SN/A#endif 2901674SN/A /* 2911674SN/A * Process export requests. 2921674SN/A */ 2931674SN/A return (vfs_export(mp, &pmp->pm_export, &args.export)); 2941674SN/A } 2951674SN/A } 2961674SN/A /* 2971674SN/A * Not an update, or updating the name: look up the name 2981674SN/A * and verify that it refers to a sensible block device. 2991674SN/A */ 3001674SN/A NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p); 3011674SN/A error = namei(ndp); 3021674SN/A if (error) 3031674SN/A return (error); 3041674SN/A devvp = ndp->ni_vp; 3051674SN/A NDFREE(ndp, NDF_ONLY_PNBUF); 3061674SN/A 3071674SN/A if (!vn_isdisk(devvp, &error)) { 3081674SN/A vrele(devvp); 3091674SN/A return (error); 3101674SN/A } 3111674SN/A /* 3121674SN/A * If mount by non-root, then verify that user has necessary 3131674SN/A * permissions on the device. 3141674SN/A */ 31517519Sapetcher if (p->p_ucred->cr_uid != 0) { 31617519Sapetcher accessmode = VREAD; 3171674SN/A if ((mp->mnt_flag & MNT_RDONLY) == 0) 3181674SN/A accessmode |= VWRITE; 3191674SN/A vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p); 3201674SN/A error = VOP_ACCESS(devvp, accessmode, p->p_ucred, p); 3211674SN/A if (error) { 3221674SN/A vput(devvp); 3231674SN/A return (error); 3241674SN/A } 3251674SN/A VOP_UNLOCK(devvp, 0, p); 3261674SN/A } 3271674SN/A if ((mp->mnt_flag & MNT_UPDATE) == 0) { 3281674SN/A error = mountmsdosfs(devvp, mp, p, &args); 3291674SN/A#ifdef MSDOSFS_DEBUG /* only needed for the printf below */ 3301674SN/A pmp = VFSTOMSDOSFS(mp); 3311674SN/A#endif 3321674SN/A } else { 3331674SN/A if (devvp != pmp->pm_devvp) 3341674SN/A error = EINVAL; /* XXX needs translation */ 3351674SN/A else 3361674SN/A vrele(devvp); 3371674SN/A } 3381674SN/A if (error) { 3391674SN/A vrele(devvp); 3401674SN/A return (error); 3411674SN/A } 3421674SN/A 3431674SN/A error = update_mp(mp, &args); 3441674SN/A if (error) { 3451674SN/A msdosfs_unmount(mp, MNT_FORCE, p); 3461674SN/A return error; 3471674SN/A } 3481674SN/A 3491674SN/A (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size); 3501674SN/A bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size); 3511674SN/A (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 3521674SN/A &size); 35317519Sapetcher bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 3541674SN/A (void) msdosfs_statfs(mp, &mp->mnt_stat, p); 35517519Sapetcher#ifdef MSDOSFS_DEBUG 3561674SN/A printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap); 3571674SN/A#endif 3581674SN/A return (0); 3591674SN/A} 3601674SN/A 3611674SN/Astatic int 3621674SN/Amountmsdosfs(devvp, mp, p, argp) 363 struct vnode *devvp; 364 struct mount *mp; 365 struct proc *p; 366 struct msdosfs_args *argp; 367{ 368 struct msdosfsmount *pmp; 369 struct buf *bp; 370 dev_t dev = devvp->v_rdev; 371#ifndef __FreeBSD__ 372 struct partinfo dpart; 373 int bsize = 0, dtype = 0, tmp; 374#endif 375 union bootsector *bsp; 376 struct byte_bpb33 *b33; 377 struct byte_bpb50 *b50; 378 struct byte_bpb710 *b710; 379 u_int8_t SecPerClust; 380 u_long clusters; 381 int ronly, error; 382 383 /* 384 * Disallow multiple mounts of the same device. 385 * Disallow mounting of a device that is currently in use 386 * (except for root, which might share swap device for miniroot). 387 * Flush out any old buffers remaining from a previous use. 388 */ 389 error = vfs_mountedon(devvp); 390 if (error) 391 return (error); 392 if (vcount(devvp) > 1 && devvp != rootvp) 393 return (EBUSY); 394 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p); 395 error = vinvalbuf(devvp, V_SAVE, p->p_ucred, p, 0, 0); 396 VOP_UNLOCK(devvp, 0, p); 397 if (error) 398 return (error); 399 400 ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 401 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p); 402 error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p); 403 VOP_UNLOCK(devvp, 0, p); 404 if (error) 405 return (error); 406 407 bp = NULL; /* both used in error_exit */ 408 pmp = NULL; 409 410#ifndef __FreeBSD__ 411 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 412 /* 413 * We need the disklabel to calculate the size of a FAT entry 414 * later on. Also make sure the partition contains a filesystem 415 * of type FS_MSDOS. This doesn't work for floppies, so we have 416 * to check for them too. 417 * 418 * At least some parts of the msdos fs driver seem to assume 419 * that the size of a disk block will always be 512 bytes. 420 * Let's check it... 421 */ 422 error = VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, 423 FREAD, NOCRED, p); 424 if (error) 425 goto error_exit; 426 tmp = dpart.part->p_fstype; 427 dtype = dpart.disklab->d_type; 428 bsize = dpart.disklab->d_secsize; 429 if (bsize != 512 || (dtype!=DTYPE_FLOPPY && tmp!=FS_MSDOS)) { 430 error = EINVAL; 431 goto error_exit; 432 } 433 } 434#endif 435 436 /* 437 * Read the boot sector of the filesystem, and then check the 438 * boot signature. If not a dos boot sector then error out. 439 * 440 * NOTE: 2048 is a maximum sector size in current... 441 */ 442 error = bread(devvp, 0, 2048, NOCRED, &bp); 443 if (error) 444 goto error_exit; 445 bp->b_flags |= B_AGE; 446 bsp = (union bootsector *)bp->b_data; 447 b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB; 448 b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB; 449 b710 = (struct byte_bpb710 *)bsp->bs710.bsPBP; 450 451#ifndef __FreeBSD__ 452 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 453#endif 454#ifndef MSDOSFS_NOCHECKSIG 455 if (bsp->bs50.bsBootSectSig0 != BOOTSIG0 456 || bsp->bs50.bsBootSectSig1 != BOOTSIG1) { 457 error = EINVAL; 458 goto error_exit; 459 } 460#endif 461#ifndef __FreeBSD__ 462 } 463#endif 464 465 pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK | M_ZERO); 466 pmp->pm_mountp = mp; 467 468 /* 469 * Compute several useful quantities from the bpb in the 470 * bootsector. Copy in the dos 5 variant of the bpb then fix up 471 * the fields that are different between dos 5 and dos 3.3. 472 */ 473 SecPerClust = b50->bpbSecPerClust; 474 pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec); 475 pmp->pm_ResSectors = getushort(b50->bpbResSectors); 476 pmp->pm_FATs = b50->bpbFATs; 477 pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts); 478 pmp->pm_Sectors = getushort(b50->bpbSectors); 479 pmp->pm_FATsecs = getushort(b50->bpbFATsecs); 480 pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack); 481 pmp->pm_Heads = getushort(b50->bpbHeads); 482 pmp->pm_Media = b50->bpbMedia; 483 484 /* calculate the ratio of sector size to DEV_BSIZE */ 485 pmp->pm_BlkPerSec = pmp->pm_BytesPerSec / DEV_BSIZE; 486 487#ifndef __FreeBSD__ 488 if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) { 489#endif 490 /* XXX - We should probably check more values here */ 491 if (!pmp->pm_BytesPerSec || !SecPerClust 492 || !pmp->pm_Heads || pmp->pm_Heads > 255 493#ifdef PC98 494 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 255) { 495#else 496 || !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 63) { 497#endif 498 error = EINVAL; 499 goto error_exit; 500 } 501#ifndef __FreeBSD__ 502 } 503#endif 504 505 if (pmp->pm_Sectors == 0) { 506 pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs); 507 pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors); 508 } else { 509 pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs); 510 pmp->pm_HugeSectors = pmp->pm_Sectors; 511 } 512 if (pmp->pm_HugeSectors > 0xffffffff / 513 (pmp->pm_BytesPerSec / sizeof(struct direntry)) + 1) { 514 /* 515 * We cannot deal currently with this size of disk 516 * due to fileid limitations (see msdosfs_getattr and 517 * msdosfs_readdir) 518 */ 519 error = EINVAL; 520 printf("mountmsdosfs(): disk too big, sorry\n"); 521 goto error_exit; 522 } 523 524 if (pmp->pm_RootDirEnts == 0) { 525 if (bsp->bs710.bsBootSectSig2 != BOOTSIG2 526 || bsp->bs710.bsBootSectSig3 != BOOTSIG3 527 || pmp->pm_Sectors 528 || pmp->pm_FATsecs 529 || getushort(b710->bpbFSVers)) { 530 error = EINVAL; 531 printf("mountmsdosfs(): bad FAT32 filesystem\n"); 532 goto error_exit; 533 } 534 pmp->pm_fatmask = FAT32_MASK; 535 pmp->pm_fatmult = 4; 536 pmp->pm_fatdiv = 1; 537 pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs); 538 if (getushort(b710->bpbExtFlags) & FATMIRROR) 539 pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM; 540 else 541 pmp->pm_flags |= MSDOSFS_FATMIRROR; 542 } else 543 pmp->pm_flags |= MSDOSFS_FATMIRROR; 544 545 /* 546 * Check a few values (could do some more): 547 * - logical sector size: power of 2, >= block size 548 * - sectors per cluster: power of 2, >= 1 549 * - number of sectors: >= 1, <= size of partition 550 */ 551 if ( (SecPerClust == 0) 552 || (SecPerClust & (SecPerClust - 1)) 553 || (pmp->pm_BytesPerSec < DEV_BSIZE) 554 || (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1)) 555 || (pmp->pm_HugeSectors == 0) 556 ) { 557 error = EINVAL; 558 goto error_exit; 559 } 560 561 pmp->pm_HugeSectors *= pmp->pm_BlkPerSec; 562 pmp->pm_HiddenSects *= pmp->pm_BlkPerSec; /* XXX not used? */ 563 pmp->pm_FATsecs *= pmp->pm_BlkPerSec; 564 SecPerClust *= pmp->pm_BlkPerSec; 565 566 pmp->pm_fatblk = pmp->pm_ResSectors * pmp->pm_BlkPerSec; 567 568 if (FAT32(pmp)) { 569 pmp->pm_rootdirblk = getulong(b710->bpbRootClust); 570 pmp->pm_firstcluster = pmp->pm_fatblk 571 + (pmp->pm_FATs * pmp->pm_FATsecs); 572 pmp->pm_fsinfo = getushort(b710->bpbFSInfo) * pmp->pm_BlkPerSec; 573 } else { 574 pmp->pm_rootdirblk = pmp->pm_fatblk + 575 (pmp->pm_FATs * pmp->pm_FATsecs); 576 pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry) 577 + DEV_BSIZE - 1) 578 / DEV_BSIZE; /* in blocks */ 579 pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize; 580 } 581 582 pmp->pm_maxcluster = (pmp->pm_HugeSectors - pmp->pm_firstcluster) / 583 SecPerClust + 1; 584 pmp->pm_fatsize = pmp->pm_FATsecs * DEV_BSIZE; /* XXX not used? */ 585 586#ifndef __FreeBSD__ 587 if (argp->flags & MSDOSFSMNT_GEMDOSFS) { 588 if ((pmp->pm_maxcluster <= (0xff0 - 2)) 589 && ((dtype == DTYPE_FLOPPY) || ((dtype == DTYPE_VNODE) 590 && ((pmp->pm_Heads == 1) || (pmp->pm_Heads == 2)))) 591 ) { 592 pmp->pm_fatmask = FAT12_MASK; 593 pmp->pm_fatmult = 3; 594 pmp->pm_fatdiv = 2; 595 } else { 596 pmp->pm_fatmask = FAT16_MASK; 597 pmp->pm_fatmult = 2; 598 pmp->pm_fatdiv = 1; 599 } 600 } else 601#endif 602 if (pmp->pm_fatmask == 0) { 603 if (pmp->pm_maxcluster 604 <= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) { 605 /* 606 * This will usually be a floppy disk. This size makes 607 * sure that one fat entry will not be split across 608 * multiple blocks. 609 */ 610 pmp->pm_fatmask = FAT12_MASK; 611 pmp->pm_fatmult = 3; 612 pmp->pm_fatdiv = 2; 613 } else { 614 pmp->pm_fatmask = FAT16_MASK; 615 pmp->pm_fatmult = 2; 616 pmp->pm_fatdiv = 1; 617 } 618 } 619 620 clusters = (pmp->pm_fatsize / pmp->pm_fatmult) * pmp->pm_fatdiv; 621 if (pmp->pm_maxcluster >= clusters) { 622 printf("Warning: number of clusters (%ld) exceeds FAT " 623 "capacity (%ld)\n", pmp->pm_maxcluster + 1, clusters); 624 pmp->pm_maxcluster = clusters - 1; 625 } 626 627 628 if (FAT12(pmp)) 629 pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec; 630 else 631 pmp->pm_fatblocksize = MSDOSFS_DFLTBSIZE; 632 633 pmp->pm_fatblocksec = pmp->pm_fatblocksize / DEV_BSIZE; 634 pmp->pm_bnshift = ffs(DEV_BSIZE) - 1; 635 636 /* 637 * Compute mask and shift value for isolating cluster relative byte 638 * offsets and cluster numbers from a file offset. 639 */ 640 pmp->pm_bpcluster = SecPerClust * DEV_BSIZE; 641 pmp->pm_crbomask = pmp->pm_bpcluster - 1; 642 pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1; 643 644 /* 645 * Check for valid cluster size 646 * must be a power of 2 647 */ 648 if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) { 649 error = EINVAL; 650 goto error_exit; 651 } 652 653 /* 654 * Release the bootsector buffer. 655 */ 656 brelse(bp); 657 bp = NULL; 658 659 /* 660 * Check FSInfo. 661 */ 662 if (pmp->pm_fsinfo) { 663 struct fsinfo *fp; 664 665 if ((error = bread(devvp, pmp->pm_fsinfo, fsi_size(pmp), 666 NOCRED, &bp)) != 0) 667 goto error_exit; 668 fp = (struct fsinfo *)bp->b_data; 669 if (!bcmp(fp->fsisig1, "RRaA", 4) 670 && !bcmp(fp->fsisig2, "rrAa", 4) 671 && !bcmp(fp->fsisig3, "\0\0\125\252", 4) 672 && !bcmp(fp->fsisig4, "\0\0\125\252", 4)) 673 pmp->pm_nxtfree = getulong(fp->fsinxtfree); 674 else 675 pmp->pm_fsinfo = 0; 676 brelse(bp); 677 bp = NULL; 678 } 679 680 /* 681 * Check and validate (or perhaps invalidate?) the fsinfo structure? XXX 682 */ 683 684 /* 685 * Allocate memory for the bitmap of allocated clusters, and then 686 * fill it in. 687 */ 688 pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 1) 689 / N_INUSEBITS) 690 * sizeof(*pmp->pm_inusemap), 691 M_MSDOSFSFAT, M_WAITOK); 692 693 /* 694 * fillinusemap() needs pm_devvp. 695 */ 696 pmp->pm_dev = dev; 697 pmp->pm_devvp = devvp; 698 699 /* 700 * Have the inuse map filled in. 701 */ 702 if ((error = fillinusemap(pmp)) != 0) 703 goto error_exit; 704 705 /* 706 * If they want fat updates to be synchronous then let them suffer 707 * the performance degradation in exchange for the on disk copy of 708 * the fat being correct just about all the time. I suppose this 709 * would be a good thing to turn on if the kernel is still flakey. 710 */ 711 if (mp->mnt_flag & MNT_SYNCHRONOUS) 712 pmp->pm_flags |= MSDOSFSMNT_WAITONFAT; 713 714 /* 715 * Finish up. 716 */ 717 if (ronly) 718 pmp->pm_flags |= MSDOSFSMNT_RONLY; 719 else 720 pmp->pm_fmod = 1; 721 mp->mnt_data = (qaddr_t) pmp; 722 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 723 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 724 mp->mnt_flag |= MNT_LOCAL; 725 devvp->v_rdev->si_mountpoint = mp; 726 727 return 0; 728 729error_exit: 730 if (bp) 731 brelse(bp); 732 (void) VOP_CLOSE(devvp, ronly ? FREAD : FREAD | FWRITE, NOCRED, p); 733 if (pmp) { 734 if (pmp->pm_inusemap) 735 free(pmp->pm_inusemap, M_MSDOSFSFAT); 736 free(pmp, M_MSDOSFSMNT); 737 mp->mnt_data = (qaddr_t)0; 738 } 739 return (error); 740} 741 742/* 743 * Unmount the filesystem described by mp. 744 */ 745static int 746msdosfs_unmount(mp, mntflags, p) 747 struct mount *mp; 748 int mntflags; 749 struct proc *p; 750{ 751 struct msdosfsmount *pmp; 752 int error, flags; 753 754 flags = 0; 755 if (mntflags & MNT_FORCE) 756 flags |= FORCECLOSE; 757 error = vflush(mp, NULLVP, flags); 758 if (error) 759 return error; 760 pmp = VFSTOMSDOSFS(mp); 761 pmp->pm_devvp->v_rdev->si_mountpoint = NULL; 762#ifdef MSDOSFS_DEBUG 763 { 764 struct vnode *vp = pmp->pm_devvp; 765 766 printf("msdosfs_umount(): just before calling VOP_CLOSE()\n"); 767 printf("flag %08lx, usecount %d, writecount %d, holdcnt %ld\n", 768 vp->v_flag, vp->v_usecount, vp->v_writecount, vp->v_holdcnt); 769 printf("id %lu, mount %p, op %p\n", 770 vp->v_id, vp->v_mount, vp->v_op); 771 printf("freef %p, freeb %p, mount %p\n", 772 vp->v_freelist.tqe_next, vp->v_freelist.tqe_prev, 773 vp->v_mount); 774 printf("cleanblkhd %p, dirtyblkhd %p, numoutput %ld, type %d\n", 775 TAILQ_FIRST(&vp->v_cleanblkhd), 776 TAILQ_FIRST(&vp->v_dirtyblkhd), 777 vp->v_numoutput, vp->v_type); 778 printf("union %p, tag %d, data[0] %08x, data[1] %08x\n", 779 vp->v_socket, vp->v_tag, 780 ((u_int *)vp->v_data)[0], 781 ((u_int *)vp->v_data)[1]); 782 } 783#endif 784 error = VOP_CLOSE(pmp->pm_devvp, 785 (pmp->pm_flags&MSDOSFSMNT_RONLY) ? FREAD : FREAD | FWRITE, 786 NOCRED, p); 787 vrele(pmp->pm_devvp); 788 free(pmp->pm_inusemap, M_MSDOSFSFAT); 789 free(pmp, M_MSDOSFSMNT); 790 mp->mnt_data = (qaddr_t)0; 791 mp->mnt_flag &= ~MNT_LOCAL; 792 return (error); 793} 794 795static int 796msdosfs_root(mp, vpp) 797 struct mount *mp; 798 struct vnode **vpp; 799{ 800 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 801 struct denode *ndep; 802 int error; 803 804#ifdef MSDOSFS_DEBUG 805 printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp); 806#endif 807 error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep); 808 if (error) 809 return (error); 810 *vpp = DETOV(ndep); 811 return (0); 812} 813 814static int 815msdosfs_statfs(mp, sbp, p) 816 struct mount *mp; 817 struct statfs *sbp; 818 struct proc *p; 819{ 820 struct msdosfsmount *pmp; 821 822 pmp = VFSTOMSDOSFS(mp); 823 sbp->f_bsize = pmp->pm_bpcluster; 824 sbp->f_iosize = pmp->pm_bpcluster; 825 sbp->f_blocks = pmp->pm_maxcluster + 1; 826 sbp->f_bfree = pmp->pm_freeclustercount; 827 sbp->f_bavail = pmp->pm_freeclustercount; 828 sbp->f_files = pmp->pm_RootDirEnts; /* XXX */ 829 sbp->f_ffree = 0; /* what to put in here? */ 830 if (sbp != &mp->mnt_stat) { 831 sbp->f_type = mp->mnt_vfc->vfc_typenum; 832 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 833 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 834 } 835 strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN); 836 return (0); 837} 838 839static int 840msdosfs_sync(mp, waitfor, cred, p) 841 struct mount *mp; 842 int waitfor; 843 struct ucred *cred; 844 struct proc *p; 845{ 846 struct vnode *vp, *nvp; 847 struct denode *dep; 848 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 849 int error, allerror = 0; 850 851 /* 852 * If we ever switch to not updating all of the fats all the time, 853 * this would be the place to update them from the first one. 854 */ 855 if (pmp->pm_fmod != 0) { 856 if (pmp->pm_flags & MSDOSFSMNT_RONLY) 857 panic("msdosfs_sync: rofs mod"); 858 else { 859 /* update fats here */ 860 } 861 } 862 /* 863 * Write back each (modified) denode. 864 */ 865 mtx_enter(&mntvnode_mtx, MTX_DEF); 866loop: 867 for (vp = LIST_FIRST(&mp->mnt_vnodelist); vp != NULL; vp = nvp) { 868 /* 869 * If the vnode that we are about to sync is no longer 870 * associated with this mount point, start over. 871 */ 872 if (vp->v_mount != mp) 873 goto loop; 874 875 mtx_enter(&vp->v_interlock, MTX_DEF); 876 nvp = LIST_NEXT(vp, v_mntvnodes); 877 dep = VTODE(vp); 878 if (vp->v_type == VNON || 879 ((dep->de_flag & 880 (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 && 881 (TAILQ_EMPTY(&vp->v_dirtyblkhd) || waitfor == MNT_LAZY))) { 882 mtx_exit(&vp->v_interlock, MTX_DEF); 883 continue; 884 } 885 mtx_exit(&mntvnode_mtx, MTX_DEF); 886 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, p); 887 if (error) { 888 mtx_enter(&mntvnode_mtx, MTX_DEF); 889 if (error == ENOENT) 890 goto loop; 891 continue; 892 } 893 error = VOP_FSYNC(vp, cred, waitfor, p); 894 if (error) 895 allerror = error; 896 VOP_UNLOCK(vp, 0, p); 897 vrele(vp); 898 mtx_enter(&mntvnode_mtx, MTX_DEF); 899 } 900 mtx_exit(&mntvnode_mtx, MTX_DEF); 901 902 /* 903 * Flush filesystem control info. 904 */ 905 if (waitfor != MNT_LAZY) { 906 vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY, p); 907 error = VOP_FSYNC(pmp->pm_devvp, cred, waitfor, p); 908 if (error) 909 allerror = error; 910 VOP_UNLOCK(pmp->pm_devvp, 0, p); 911 } 912 return (allerror); 913} 914 915static int 916msdosfs_fhtovp(mp, fhp, vpp) 917 struct mount *mp; 918 struct fid *fhp; 919 struct vnode **vpp; 920{ 921 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 922 struct defid *defhp = (struct defid *) fhp; 923 struct denode *dep; 924 int error; 925 926 error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep); 927 if (error) { 928 *vpp = NULLVP; 929 return (error); 930 } 931 *vpp = DETOV(dep); 932 return (0); 933} 934 935static int 936msdosfs_checkexp(mp, nam, exflagsp, credanonp) 937 struct mount *mp; 938 struct sockaddr *nam; 939 int *exflagsp; 940 struct ucred **credanonp; 941{ 942 struct msdosfsmount *pmp = VFSTOMSDOSFS(mp); 943 struct netcred *np; 944 945 np = vfs_export_lookup(mp, &pmp->pm_export, nam); 946 if (np == NULL) 947 return (EACCES); 948 *exflagsp = np->netc_exflags; 949 *credanonp = &np->netc_anon; 950 return (0); 951} 952 953static int 954msdosfs_vptofh(vp, fhp) 955 struct vnode *vp; 956 struct fid *fhp; 957{ 958 struct denode *dep; 959 struct defid *defhp; 960 961 dep = VTODE(vp); 962 defhp = (struct defid *)fhp; 963 defhp->defid_len = sizeof(struct defid); 964 defhp->defid_dirclust = dep->de_dirclust; 965 defhp->defid_dirofs = dep->de_diroffset; 966 /* defhp->defid_gen = dep->de_gen; */ 967 return (0); 968} 969 970static struct vfsops msdosfs_vfsops = { 971 msdosfs_mount, 972 vfs_stdstart, 973 msdosfs_unmount, 974 msdosfs_root, 975 vfs_stdquotactl, 976 msdosfs_statfs, 977 msdosfs_sync, 978 vfs_stdvget, 979 msdosfs_fhtovp, 980 msdosfs_checkexp, 981 msdosfs_vptofh, 982 msdosfs_init, 983 msdosfs_uninit, 984 vfs_stdextattrctl, 985}; 986 987VFS_SET(msdosfs_vfsops, msdos, 0); 988