971 lines
26 KiB
C
971 lines
26 KiB
C
/* $FreeBSD$ */
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/* $NetBSD: msdosfs_vfsops.c,v 1.51 1997/11/17 15:36:58 ws Exp $ */
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/*-
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* Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
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* Copyright (C) 1994, 1995, 1997 TooLs GmbH.
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* All rights reserved.
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* Original code by Paul Popelka (paulp@uts.amdahl.com) (see below).
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by TooLs GmbH.
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* 4. The name of TooLs GmbH may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*-
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* Written by Paul Popelka (paulp@uts.amdahl.com)
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*
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* You can do anything you want with this software, just don't say you wrote
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* it, and don't remove this notice.
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*
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* This software is provided "as is".
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*
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* The author supplies this software to be publicly redistributed on the
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* understanding that the author is not responsible for the correct
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* functioning of this software in any circumstances and is not liable for
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* any damages caused by this software.
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*
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* October 1992
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/conf.h>
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#include <sys/namei.h>
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#include <sys/proc.h>
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#include <sys/kernel.h>
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#include <sys/vnode.h>
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#include <sys/mount.h>
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#include <sys/bio.h>
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#include <sys/buf.h>
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#include <sys/fcntl.h>
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#include <sys/malloc.h>
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#include <sys/stat.h> /* defines ALLPERMS */
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#include <sys/iconv.h>
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#include <sys/mutex.h>
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#include <fs/msdosfs/bpb.h>
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#include <fs/msdosfs/bootsect.h>
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#include <fs/msdosfs/msdosfsmount.h>
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#include <fs/msdosfs/direntry.h>
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#include <fs/msdosfs/denode.h>
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#include <fs/msdosfs/fat.h>
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#include <geom/geom.h>
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#include <geom/geom_vfs.h>
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#include "opt_msdosfs.h"
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/* List of mount options we support */
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static const char *msdosfs_opts[] = {
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"from",
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"export",
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"uid", "gid", "mask", "dirmask",
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"shortname", "longname", "win95",
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"kiconv", "cs_win", "cs_dos", "cs_local",
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NULL
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};
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#define MSDOSFS_DFLTBSIZE 4096
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#if 1 /*def PC98*/
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/*
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* XXX - The boot signature formatted by NEC PC-98 DOS looks like a
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* garbage or a random value :-{
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* If you want to use that broken-signatured media, define the
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* following symbol even though PC/AT.
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* (ex. mount PC-98 DOS formatted FD on PC/AT)
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*/
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#define MSDOSFS_NOCHECKSIG
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#endif
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MALLOC_DEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOSFS mount structure");
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static MALLOC_DEFINE(M_MSDOSFSFAT, "MSDOSFS FAT", "MSDOSFS file allocation table");
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struct iconv_functions *msdosfs_iconv = NULL;
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static int update_mp(struct mount *mp, struct thread *td);
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static int mountmsdosfs(struct vnode *devvp, struct mount *mp,
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struct thread *td);
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static vfs_fhtovp_t msdosfs_fhtovp;
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static vfs_mount_t msdosfs_mount;
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static vfs_root_t msdosfs_root;
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static vfs_statfs_t msdosfs_statfs;
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static vfs_sync_t msdosfs_sync;
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static vfs_unmount_t msdosfs_unmount;
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static vfs_vptofh_t msdosfs_vptofh;
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/* Maximum length of a character set name (arbitrary). */
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#define MAXCSLEN 64
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static int
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update_mp(mp, td)
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struct mount *mp;
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struct thread *td;
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{
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struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
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void *dos, *win, *local;
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int error, v;
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if (!vfs_getopt(mp->mnt_optnew, "kiconv", NULL, NULL)) {
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if (msdosfs_iconv != NULL) {
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error = vfs_getopt(mp->mnt_optnew,
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"cs_win", &win, NULL);
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if (!error)
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error = vfs_getopt(mp->mnt_optnew,
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"cs_local", &local, NULL);
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if (!error)
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error = vfs_getopt(mp->mnt_optnew,
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"cs_dos", &dos, NULL);
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if (!error) {
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msdosfs_iconv->open(win, local, &pmp->pm_u2w);
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msdosfs_iconv->open(local, win, &pmp->pm_w2u);
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msdosfs_iconv->open(dos, local, &pmp->pm_u2d);
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msdosfs_iconv->open(local, dos, &pmp->pm_d2u);
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}
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if (error != 0)
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return (error);
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} else {
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pmp->pm_w2u = NULL;
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pmp->pm_u2w = NULL;
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pmp->pm_d2u = NULL;
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pmp->pm_u2d = NULL;
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}
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}
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if (1 == vfs_scanopt(mp->mnt_optnew, "gid", "%d", &v))
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pmp->pm_gid = v;
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if (1 == vfs_scanopt(mp->mnt_optnew, "uid", "%d", &v))
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pmp->pm_uid = v;
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if (1 == vfs_scanopt(mp->mnt_optnew, "mask", "%d", &v))
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pmp->pm_mask = v & ALLPERMS;
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if (1 == vfs_scanopt(mp->mnt_optnew, "dirmask", "%d", &v))
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pmp->pm_dirmask = v & ALLPERMS;
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vfs_flagopt(mp->mnt_optnew, "shortname",
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&pmp->pm_flags, MSDOSFSMNT_SHORTNAME);
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vfs_flagopt(mp->mnt_optnew, "longname",
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&pmp->pm_flags, MSDOSFSMNT_LONGNAME);
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vfs_flagopt(mp->mnt_optnew, "kiconv",
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&pmp->pm_flags, MSDOSFSMNT_KICONV);
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/* XXX: Can't use flagopt due to negative option */
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if (!vfs_getopt(mp->mnt_optnew, "win95", NULL, NULL))
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pmp->pm_flags &= ~MSDOSFSMNT_NOWIN95;
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else
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pmp->pm_flags |= MSDOSFSMNT_NOWIN95;
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if (pmp->pm_flags & MSDOSFSMNT_NOWIN95)
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pmp->pm_flags |= MSDOSFSMNT_SHORTNAME;
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else if (!(pmp->pm_flags &
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(MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) {
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struct vnode *rootvp;
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/*
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* Try to divine whether to support Win'95 long filenames
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*/
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if (FAT32(pmp))
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pmp->pm_flags |= MSDOSFSMNT_LONGNAME;
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else {
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if ((error = msdosfs_root(mp, &rootvp, td)) != 0)
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return error;
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pmp->pm_flags |= findwin95(VTODE(rootvp))
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? MSDOSFSMNT_LONGNAME
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: MSDOSFSMNT_SHORTNAME;
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vput(rootvp);
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}
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}
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return 0;
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}
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static int
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msdosfs_cmount(struct mntarg *ma, void *data, int flags, struct thread *td)
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{
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struct msdosfs_args args;
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int error;
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if (data == NULL)
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return (EINVAL);
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error = copyin(data, &args, sizeof args);
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if (error)
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return (error);
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ma = mount_argsu(ma, "from", args.fspec, MAXPATHLEN);
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ma = mount_arg(ma, "export", &args.export, sizeof args.export);
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ma = mount_argf(ma, "uid", "%d", args.uid);
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ma = mount_argf(ma, "gid", "%d", args.gid);
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ma = mount_argf(ma, "mask", "%d", args.mask);
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ma = mount_argf(ma, "dirmask", "%d", args.dirmask);
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ma = mount_argb(ma, args.flags & MSDOSFSMNT_SHORTNAME, "noshortname");
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ma = mount_argb(ma, args.flags & MSDOSFSMNT_LONGNAME, "nolongname");
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ma = mount_argb(ma, !(args.flags & MSDOSFSMNT_NOWIN95), "nowin95");
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ma = mount_argb(ma, args.flags & MSDOSFSMNT_KICONV, "nokiconv");
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ma = mount_argsu(ma, "cs_win", args.cs_win, MAXCSLEN);
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ma = mount_argsu(ma, "cs_dos", args.cs_dos, MAXCSLEN);
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ma = mount_argsu(ma, "cs_local", args.cs_local, MAXCSLEN);
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error = kernel_mount(ma, flags);
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return (error);
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}
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/*
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* mp - path - addr in user space of mount point (ie /usr or whatever)
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* data - addr in user space of mount params including the name of the block
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* special file to treat as a filesystem.
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*/
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static int
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msdosfs_mount(struct mount *mp, struct thread *td)
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{
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struct vnode *devvp; /* vnode for blk device to mount */
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struct export_args export;
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/* msdosfs specific mount control block */
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struct msdosfsmount *pmp = NULL;
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struct nameidata ndp;
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int error, flags;
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mode_t accessmode;
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char *from;
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if (vfs_filteropt(mp->mnt_optnew, msdosfs_opts))
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return (EINVAL);
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/*
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* If updating, check whether changing from read-only to
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* read/write; if there is no device name, that's all we do.
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*/
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if (mp->mnt_flag & MNT_UPDATE) {
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pmp = VFSTOMSDOSFS(mp);
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error = vfs_copyopt(mp->mnt_optnew, "export",
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&export, sizeof export);
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if (error == 0 && export.ex_flags != 0) {
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/*
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* Process export requests.
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*/
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if ((export.ex_flags & MNT_EXPORTED) != 0 &&
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(pmp->pm_flags & MSDOSFS_LARGEFS) != 0)
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return (EOPNOTSUPP);
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return (vfs_export(mp, &export));
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}
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if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) &&
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vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0)) {
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error = VFS_SYNC(mp, MNT_WAIT, td);
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if (error)
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return (error);
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flags = WRITECLOSE;
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if (mp->mnt_flag & MNT_FORCE)
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flags |= FORCECLOSE;
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error = vflush(mp, 0, flags, td);
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if (error)
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return (error);
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DROP_GIANT();
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g_topology_lock();
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g_access(pmp->pm_cp, 0, -1, 0);
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g_topology_unlock();
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PICKUP_GIANT();
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} else if ((pmp->pm_flags & MSDOSFSMNT_RONLY) &&
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!vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0)) {
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/*
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* If upgrade to read-write by non-root, then verify
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* that user has necessary permissions on the device.
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*/
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if (suser(td)) {
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devvp = pmp->pm_devvp;
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vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
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error = VOP_ACCESS(devvp, VREAD | VWRITE,
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td->td_ucred, td);
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if (error) {
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VOP_UNLOCK(devvp, 0, td);
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return (error);
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}
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VOP_UNLOCK(devvp, 0, td);
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}
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DROP_GIANT();
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g_topology_lock();
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error = g_access(pmp->pm_cp, 0, 1, 0);
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g_topology_unlock();
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PICKUP_GIANT();
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if (error)
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return (error);
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/* Now that the volume is modifiable, mark it dirty. */
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error = markvoldirty(pmp, 1);
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if (error)
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return (error);
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}
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vfs_flagopt(mp->mnt_optnew, "ro",
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&pmp->pm_flags, MSDOSFSMNT_RONLY);
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vfs_flagopt(mp->mnt_optnew, "ro",
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&mp->mnt_flag, MNT_RDONLY);
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if (vfs_getopt(mp->mnt_optnew, "from", NULL, NULL)) {
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#ifdef __notyet__ /* doesn't work correctly with current mountd XXX */
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if (args.flags & MSDOSFSMNT_MNTOPT) {
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pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT;
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pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT;
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if (pmp->pm_flags & MSDOSFSMNT_NOWIN95)
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pmp->pm_flags |= MSDOSFSMNT_SHORTNAME;
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}
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#endif
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}
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}
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/*
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* Not an update, or updating the name: look up the name
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* and verify that it refers to a sensible disk device.
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*/
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if (vfs_getopt(mp->mnt_optnew, "from", (void **)&from, NULL))
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return (EINVAL);
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NDINIT(&ndp, LOOKUP, FOLLOW, UIO_SYSSPACE, from, td);
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error = namei(&ndp);
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if (error)
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return (error);
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devvp = ndp.ni_vp;
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NDFREE(&ndp, NDF_ONLY_PNBUF);
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if (!vn_isdisk(devvp, &error)) {
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vrele(devvp);
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return (error);
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}
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/*
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* If mount by non-root, then verify that user has necessary
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* permissions on the device.
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*/
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if (suser(td)) {
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accessmode = VREAD;
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if ((mp->mnt_flag & MNT_RDONLY) == 0)
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accessmode |= VWRITE;
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vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td);
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error = VOP_ACCESS(devvp, accessmode, td->td_ucred, td);
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if (error) {
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vput(devvp);
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return (error);
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}
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VOP_UNLOCK(devvp, 0, td);
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}
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if ((mp->mnt_flag & MNT_UPDATE) == 0) {
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error = mountmsdosfs(devvp, mp, td);
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#ifdef MSDOSFS_DEBUG /* only needed for the printf below */
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pmp = VFSTOMSDOSFS(mp);
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#endif
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} else {
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if (devvp != pmp->pm_devvp)
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error = EINVAL; /* XXX needs translation */
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else
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vrele(devvp);
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}
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if (error) {
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vrele(devvp);
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return (error);
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}
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|
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error = update_mp(mp, td);
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if (error) {
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if ((mp->mnt_flag & MNT_UPDATE) == 0)
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msdosfs_unmount(mp, MNT_FORCE, td);
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return error;
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}
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vfs_mountedfrom(mp, from);
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#ifdef MSDOSFS_DEBUG
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printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap);
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#endif
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return (0);
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}
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|
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static int
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mountmsdosfs(devvp, mp, td)
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struct vnode *devvp;
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struct mount *mp;
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struct thread *td;
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{
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struct msdosfsmount *pmp;
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struct buf *bp;
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struct cdev *dev = devvp->v_rdev;
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union bootsector *bsp;
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struct byte_bpb33 *b33;
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struct byte_bpb50 *b50;
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struct byte_bpb710 *b710;
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u_int8_t SecPerClust;
|
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u_long clusters;
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int ronly, error;
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struct g_consumer *cp;
|
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struct bufobj *bo;
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ronly = !vfs_getopt(mp->mnt_optnew, "ro", NULL, NULL);
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/* XXX: use VOP_ACCESS to check FS perms */
|
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DROP_GIANT();
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g_topology_lock();
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error = g_vfs_open(devvp, &cp, "msdos", ronly ? 0 : 1);
|
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g_topology_unlock();
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|
PICKUP_GIANT();
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VOP_UNLOCK(devvp, 0, td);
|
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if (error)
|
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return (error);
|
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|
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bo = &devvp->v_bufobj;
|
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bp = NULL; /* both used in error_exit */
|
|
pmp = NULL;
|
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|
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/*
|
|
* Read the boot sector of the filesystem, and then check the
|
|
* boot signature. If not a dos boot sector then error out.
|
|
*
|
|
* NOTE: 2048 is a maximum sector size in current...
|
|
*/
|
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error = bread(devvp, 0, 2048, NOCRED, &bp);
|
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if (error)
|
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goto error_exit;
|
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bp->b_flags |= B_AGE;
|
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bsp = (union bootsector *)bp->b_data;
|
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b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB;
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b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB;
|
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b710 = (struct byte_bpb710 *)bsp->bs710.bsBPB;
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|
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#ifndef MSDOSFS_NOCHECKSIG
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if (bsp->bs50.bsBootSectSig0 != BOOTSIG0
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|| bsp->bs50.bsBootSectSig1 != BOOTSIG1) {
|
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error = EINVAL;
|
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goto error_exit;
|
|
}
|
|
#endif
|
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|
|
pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK | M_ZERO);
|
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pmp->pm_mountp = mp;
|
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pmp->pm_cp = cp;
|
|
pmp->pm_bo = bo;
|
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|
|
/*
|
|
* Compute several useful quantities from the bpb in the
|
|
* bootsector. Copy in the dos 5 variant of the bpb then fix up
|
|
* the fields that are different between dos 5 and dos 3.3.
|
|
*/
|
|
SecPerClust = b50->bpbSecPerClust;
|
|
pmp->pm_BytesPerSec = getushort(b50->bpbBytesPerSec);
|
|
if (pmp->pm_BytesPerSec < DEV_BSIZE) {
|
|
error = EINVAL;
|
|
goto error_exit;
|
|
}
|
|
pmp->pm_ResSectors = getushort(b50->bpbResSectors);
|
|
pmp->pm_FATs = b50->bpbFATs;
|
|
pmp->pm_RootDirEnts = getushort(b50->bpbRootDirEnts);
|
|
pmp->pm_Sectors = getushort(b50->bpbSectors);
|
|
pmp->pm_FATsecs = getushort(b50->bpbFATsecs);
|
|
pmp->pm_SecPerTrack = getushort(b50->bpbSecPerTrack);
|
|
pmp->pm_Heads = getushort(b50->bpbHeads);
|
|
pmp->pm_Media = b50->bpbMedia;
|
|
|
|
/* calculate the ratio of sector size to DEV_BSIZE */
|
|
pmp->pm_BlkPerSec = pmp->pm_BytesPerSec / DEV_BSIZE;
|
|
|
|
/* XXX - We should probably check more values here */
|
|
if (!pmp->pm_BytesPerSec || !SecPerClust
|
|
|| !pmp->pm_Heads
|
|
#ifdef PC98
|
|
|| !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 255) {
|
|
#else
|
|
|| !pmp->pm_SecPerTrack || pmp->pm_SecPerTrack > 63) {
|
|
#endif
|
|
error = EINVAL;
|
|
goto error_exit;
|
|
}
|
|
|
|
if (pmp->pm_Sectors == 0) {
|
|
pmp->pm_HiddenSects = getulong(b50->bpbHiddenSecs);
|
|
pmp->pm_HugeSectors = getulong(b50->bpbHugeSectors);
|
|
} else {
|
|
pmp->pm_HiddenSects = getushort(b33->bpbHiddenSecs);
|
|
pmp->pm_HugeSectors = pmp->pm_Sectors;
|
|
}
|
|
#ifndef MSDOSFS_LARGE
|
|
if (pmp->pm_HugeSectors > 0xffffffff /
|
|
(pmp->pm_BytesPerSec / sizeof(struct direntry)) + 1) {
|
|
/*
|
|
* We cannot deal currently with this size of disk
|
|
* due to fileid limitations (see msdosfs_getattr and
|
|
* msdosfs_readdir)
|
|
*/
|
|
error = EINVAL;
|
|
printf("mountmsdosfs(): disk too big, sorry\n");
|
|
goto error_exit;
|
|
}
|
|
#endif /* !MSDOSFS_LARGE */
|
|
|
|
if (pmp->pm_RootDirEnts == 0) {
|
|
if (bsp->bs710.bsBootSectSig2 != BOOTSIG2
|
|
|| bsp->bs710.bsBootSectSig3 != BOOTSIG3
|
|
|| pmp->pm_Sectors
|
|
|| pmp->pm_FATsecs
|
|
|| getushort(b710->bpbFSVers)) {
|
|
error = EINVAL;
|
|
printf("mountmsdosfs(): bad FAT32 filesystem\n");
|
|
goto error_exit;
|
|
}
|
|
pmp->pm_fatmask = FAT32_MASK;
|
|
pmp->pm_fatmult = 4;
|
|
pmp->pm_fatdiv = 1;
|
|
pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs);
|
|
if (getushort(b710->bpbExtFlags) & FATMIRROR)
|
|
pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM;
|
|
else
|
|
pmp->pm_flags |= MSDOSFS_FATMIRROR;
|
|
} else
|
|
pmp->pm_flags |= MSDOSFS_FATMIRROR;
|
|
|
|
/*
|
|
* Check a few values (could do some more):
|
|
* - logical sector size: power of 2, >= block size
|
|
* - sectors per cluster: power of 2, >= 1
|
|
* - number of sectors: >= 1, <= size of partition
|
|
* - number of FAT sectors: >= 1
|
|
*/
|
|
if ( (SecPerClust == 0)
|
|
|| (SecPerClust & (SecPerClust - 1))
|
|
|| (pmp->pm_BytesPerSec < DEV_BSIZE)
|
|
|| (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1))
|
|
|| (pmp->pm_HugeSectors == 0)
|
|
|| (pmp->pm_FATsecs == 0)
|
|
) {
|
|
error = EINVAL;
|
|
goto error_exit;
|
|
}
|
|
|
|
pmp->pm_HugeSectors *= pmp->pm_BlkPerSec;
|
|
pmp->pm_HiddenSects *= pmp->pm_BlkPerSec; /* XXX not used? */
|
|
pmp->pm_FATsecs *= pmp->pm_BlkPerSec;
|
|
SecPerClust *= pmp->pm_BlkPerSec;
|
|
|
|
pmp->pm_fatblk = pmp->pm_ResSectors * pmp->pm_BlkPerSec;
|
|
|
|
if (FAT32(pmp)) {
|
|
pmp->pm_rootdirblk = getulong(b710->bpbRootClust);
|
|
pmp->pm_firstcluster = pmp->pm_fatblk
|
|
+ (pmp->pm_FATs * pmp->pm_FATsecs);
|
|
pmp->pm_fsinfo = getushort(b710->bpbFSInfo) * pmp->pm_BlkPerSec;
|
|
} else {
|
|
pmp->pm_rootdirblk = pmp->pm_fatblk +
|
|
(pmp->pm_FATs * pmp->pm_FATsecs);
|
|
pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry)
|
|
+ DEV_BSIZE - 1)
|
|
/ DEV_BSIZE; /* in blocks */
|
|
pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize;
|
|
}
|
|
|
|
pmp->pm_maxcluster = (pmp->pm_HugeSectors - pmp->pm_firstcluster) /
|
|
SecPerClust + 1;
|
|
pmp->pm_fatsize = pmp->pm_FATsecs * DEV_BSIZE; /* XXX not used? */
|
|
|
|
if (pmp->pm_fatmask == 0) {
|
|
if (pmp->pm_maxcluster
|
|
<= ((CLUST_RSRVD - CLUST_FIRST) & FAT12_MASK)) {
|
|
/*
|
|
* This will usually be a floppy disk. This size makes
|
|
* sure that one fat entry will not be split across
|
|
* multiple blocks.
|
|
*/
|
|
pmp->pm_fatmask = FAT12_MASK;
|
|
pmp->pm_fatmult = 3;
|
|
pmp->pm_fatdiv = 2;
|
|
} else {
|
|
pmp->pm_fatmask = FAT16_MASK;
|
|
pmp->pm_fatmult = 2;
|
|
pmp->pm_fatdiv = 1;
|
|
}
|
|
}
|
|
|
|
clusters = (pmp->pm_fatsize / pmp->pm_fatmult) * pmp->pm_fatdiv;
|
|
if (pmp->pm_maxcluster >= clusters) {
|
|
printf("Warning: number of clusters (%ld) exceeds FAT "
|
|
"capacity (%ld)\n", pmp->pm_maxcluster + 1, clusters);
|
|
pmp->pm_maxcluster = clusters - 1;
|
|
}
|
|
|
|
|
|
if (FAT12(pmp))
|
|
pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec;
|
|
else
|
|
pmp->pm_fatblocksize = MSDOSFS_DFLTBSIZE;
|
|
|
|
pmp->pm_fatblocksec = pmp->pm_fatblocksize / DEV_BSIZE;
|
|
pmp->pm_bnshift = ffs(DEV_BSIZE) - 1;
|
|
|
|
/*
|
|
* Compute mask and shift value for isolating cluster relative byte
|
|
* offsets and cluster numbers from a file offset.
|
|
*/
|
|
pmp->pm_bpcluster = SecPerClust * DEV_BSIZE;
|
|
pmp->pm_crbomask = pmp->pm_bpcluster - 1;
|
|
pmp->pm_cnshift = ffs(pmp->pm_bpcluster) - 1;
|
|
|
|
/*
|
|
* Check for valid cluster size
|
|
* must be a power of 2
|
|
*/
|
|
if (pmp->pm_bpcluster ^ (1 << pmp->pm_cnshift)) {
|
|
error = EINVAL;
|
|
goto error_exit;
|
|
}
|
|
|
|
/*
|
|
* Release the bootsector buffer.
|
|
*/
|
|
brelse(bp);
|
|
bp = NULL;
|
|
|
|
/*
|
|
* Check FSInfo.
|
|
*/
|
|
if (pmp->pm_fsinfo) {
|
|
struct fsinfo *fp;
|
|
|
|
if ((error = bread(devvp, pmp->pm_fsinfo, fsi_size(pmp),
|
|
NOCRED, &bp)) != 0)
|
|
goto error_exit;
|
|
fp = (struct fsinfo *)bp->b_data;
|
|
if (!bcmp(fp->fsisig1, "RRaA", 4)
|
|
&& !bcmp(fp->fsisig2, "rrAa", 4)
|
|
&& !bcmp(fp->fsisig3, "\0\0\125\252", 4)
|
|
&& !bcmp(fp->fsisig4, "\0\0\125\252", 4)) {
|
|
pmp->pm_nxtfree = getulong(fp->fsinxtfree);
|
|
if (pmp->pm_nxtfree == 0xffffffff)
|
|
pmp->pm_nxtfree = CLUST_FIRST;
|
|
} else
|
|
pmp->pm_fsinfo = 0;
|
|
brelse(bp);
|
|
bp = NULL;
|
|
}
|
|
|
|
/*
|
|
* Check and validate (or perhaps invalidate?) the fsinfo structure?
|
|
*/
|
|
if (pmp->pm_fsinfo && pmp->pm_nxtfree > pmp->pm_maxcluster) {
|
|
printf(
|
|
"Next free cluster in FSInfo (%lu) exceeds maxcluster (%lu)\n",
|
|
pmp->pm_nxtfree, pmp->pm_maxcluster);
|
|
error = EINVAL;
|
|
goto error_exit;
|
|
}
|
|
|
|
/*
|
|
* Allocate memory for the bitmap of allocated clusters, and then
|
|
* fill it in.
|
|
*/
|
|
pmp->pm_inusemap = malloc(howmany(pmp->pm_maxcluster + 1, N_INUSEBITS)
|
|
* sizeof(*pmp->pm_inusemap),
|
|
M_MSDOSFSFAT, M_WAITOK);
|
|
|
|
/*
|
|
* fillinusemap() needs pm_devvp.
|
|
*/
|
|
pmp->pm_dev = dev;
|
|
pmp->pm_devvp = devvp;
|
|
|
|
/*
|
|
* Have the inuse map filled in.
|
|
*/
|
|
if ((error = fillinusemap(pmp)) != 0)
|
|
goto error_exit;
|
|
|
|
/*
|
|
* If they want fat updates to be synchronous then let them suffer
|
|
* the performance degradation in exchange for the on disk copy of
|
|
* the fat being correct just about all the time. I suppose this
|
|
* would be a good thing to turn on if the kernel is still flakey.
|
|
*/
|
|
if (mp->mnt_flag & MNT_SYNCHRONOUS)
|
|
pmp->pm_flags |= MSDOSFSMNT_WAITONFAT;
|
|
|
|
/*
|
|
* Finish up.
|
|
*/
|
|
if (ronly)
|
|
pmp->pm_flags |= MSDOSFSMNT_RONLY;
|
|
else {
|
|
/* Mark the volume dirty while it is mounted read/write. */
|
|
if ((error = markvoldirty(pmp, 1)) != 0)
|
|
goto error_exit;
|
|
pmp->pm_fmod = 1;
|
|
}
|
|
mp->mnt_data = (qaddr_t) pmp;
|
|
mp->mnt_stat.f_fsid.val[0] = dev2udev(dev);
|
|
mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
|
|
mp->mnt_flag |= MNT_LOCAL;
|
|
|
|
#ifdef MSDOSFS_LARGE
|
|
msdosfs_fileno_init(mp);
|
|
#endif
|
|
|
|
return 0;
|
|
|
|
error_exit:
|
|
if (bp)
|
|
brelse(bp);
|
|
if (cp != NULL) {
|
|
DROP_GIANT();
|
|
g_topology_lock();
|
|
g_vfs_close(cp, td);
|
|
g_topology_unlock();
|
|
PICKUP_GIANT();
|
|
}
|
|
if (pmp) {
|
|
if (pmp->pm_inusemap)
|
|
free(pmp->pm_inusemap, M_MSDOSFSFAT);
|
|
free(pmp, M_MSDOSFSMNT);
|
|
mp->mnt_data = (qaddr_t)0;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Unmount the filesystem described by mp.
|
|
*/
|
|
static int
|
|
msdosfs_unmount(mp, mntflags, td)
|
|
struct mount *mp;
|
|
int mntflags;
|
|
struct thread *td;
|
|
{
|
|
struct msdosfsmount *pmp;
|
|
int error, flags;
|
|
|
|
flags = 0;
|
|
if (mntflags & MNT_FORCE)
|
|
flags |= FORCECLOSE;
|
|
error = vflush(mp, 0, flags, td);
|
|
if (error)
|
|
return error;
|
|
pmp = VFSTOMSDOSFS(mp);
|
|
if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) {
|
|
if (pmp->pm_w2u)
|
|
msdosfs_iconv->close(pmp->pm_w2u);
|
|
if (pmp->pm_u2w)
|
|
msdosfs_iconv->close(pmp->pm_u2w);
|
|
if (pmp->pm_d2u)
|
|
msdosfs_iconv->close(pmp->pm_d2u);
|
|
if (pmp->pm_u2d)
|
|
msdosfs_iconv->close(pmp->pm_u2d);
|
|
}
|
|
|
|
/* If the volume was mounted read/write, mark it clean now. */
|
|
if ((pmp->pm_flags & MSDOSFSMNT_RONLY) == 0) {
|
|
error = markvoldirty(pmp, 0);
|
|
if (error && (flags & FORCECLOSE) == 0)
|
|
return (error);
|
|
}
|
|
#ifdef MSDOSFS_DEBUG
|
|
{
|
|
struct vnode *vp = pmp->pm_devvp;
|
|
|
|
VI_LOCK(vp);
|
|
vn_printf(vp,
|
|
"msdosfs_umount(): just before calling VOP_CLOSE()\n");
|
|
printf("freef %p, freeb %p, mount %p\n",
|
|
TAILQ_NEXT(vp, v_freelist), vp->v_freelist.tqe_prev,
|
|
vp->v_mount);
|
|
printf("cleanblkhd %p, dirtyblkhd %p, numoutput %ld, type %d\n",
|
|
TAILQ_FIRST(&vp->v_bufobj.bo_clean.bv_hd),
|
|
TAILQ_FIRST(&vp->v_bufobj.bo_dirty.bv_hd),
|
|
vp->v_bufobj.bo_numoutput, vp->v_type);
|
|
VI_UNLOCK(vp);
|
|
}
|
|
#endif
|
|
DROP_GIANT();
|
|
g_topology_lock();
|
|
g_vfs_close(pmp->pm_cp, td);
|
|
g_topology_unlock();
|
|
PICKUP_GIANT();
|
|
vrele(pmp->pm_devvp);
|
|
free(pmp->pm_inusemap, M_MSDOSFSFAT);
|
|
#ifdef MSDOSFS_LARGE
|
|
msdosfs_fileno_free(mp);
|
|
#endif
|
|
free(pmp, M_MSDOSFSMNT);
|
|
mp->mnt_data = (qaddr_t)0;
|
|
mp->mnt_flag &= ~MNT_LOCAL;
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
msdosfs_root(mp, vpp, td)
|
|
struct mount *mp;
|
|
struct vnode **vpp;
|
|
struct thread *td;
|
|
{
|
|
struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
|
|
struct denode *ndep;
|
|
int error;
|
|
|
|
#ifdef MSDOSFS_DEBUG
|
|
printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp);
|
|
#endif
|
|
error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep);
|
|
if (error)
|
|
return (error);
|
|
*vpp = DETOV(ndep);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
msdosfs_statfs(mp, sbp, td)
|
|
struct mount *mp;
|
|
struct statfs *sbp;
|
|
struct thread *td;
|
|
{
|
|
struct msdosfsmount *pmp;
|
|
|
|
pmp = VFSTOMSDOSFS(mp);
|
|
sbp->f_bsize = pmp->pm_bpcluster;
|
|
sbp->f_iosize = pmp->pm_bpcluster;
|
|
sbp->f_blocks = pmp->pm_maxcluster + 1;
|
|
sbp->f_bfree = pmp->pm_freeclustercount;
|
|
sbp->f_bavail = pmp->pm_freeclustercount;
|
|
sbp->f_files = pmp->pm_RootDirEnts; /* XXX */
|
|
sbp->f_ffree = 0; /* what to put in here? */
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
msdosfs_sync(mp, waitfor, td)
|
|
struct mount *mp;
|
|
int waitfor;
|
|
struct thread *td;
|
|
{
|
|
struct vnode *vp, *nvp;
|
|
struct denode *dep;
|
|
struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
|
|
int error, allerror = 0;
|
|
|
|
/*
|
|
* If we ever switch to not updating all of the fats all the time,
|
|
* this would be the place to update them from the first one.
|
|
*/
|
|
if (pmp->pm_fmod != 0) {
|
|
if (pmp->pm_flags & MSDOSFSMNT_RONLY)
|
|
panic("msdosfs_sync: rofs mod");
|
|
else {
|
|
/* update fats here */
|
|
}
|
|
}
|
|
/*
|
|
* Write back each (modified) denode.
|
|
*/
|
|
MNT_ILOCK(mp);
|
|
loop:
|
|
MNT_VNODE_FOREACH(vp, mp, nvp) {
|
|
VI_LOCK(vp);
|
|
if (vp->v_type == VNON || (vp->v_iflag & VI_XLOCK)) {
|
|
VI_UNLOCK(vp);
|
|
continue;
|
|
}
|
|
MNT_IUNLOCK(mp);
|
|
dep = VTODE(vp);
|
|
if ((dep->de_flag &
|
|
(DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0 &&
|
|
(vp->v_bufobj.bo_dirty.bv_cnt == 0 ||
|
|
waitfor == MNT_LAZY)) {
|
|
VI_UNLOCK(vp);
|
|
MNT_ILOCK(mp);
|
|
continue;
|
|
}
|
|
error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK, td);
|
|
if (error) {
|
|
MNT_ILOCK(mp);
|
|
if (error == ENOENT)
|
|
goto loop;
|
|
continue;
|
|
}
|
|
error = VOP_FSYNC(vp, waitfor, td);
|
|
if (error)
|
|
allerror = error;
|
|
VOP_UNLOCK(vp, 0, td);
|
|
vrele(vp);
|
|
MNT_ILOCK(mp);
|
|
}
|
|
MNT_IUNLOCK(mp);
|
|
|
|
/*
|
|
* Flush filesystem control info.
|
|
*/
|
|
if (waitfor != MNT_LAZY) {
|
|
vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY, td);
|
|
error = VOP_FSYNC(pmp->pm_devvp, waitfor, td);
|
|
if (error)
|
|
allerror = error;
|
|
VOP_UNLOCK(pmp->pm_devvp, 0, td);
|
|
}
|
|
return (allerror);
|
|
}
|
|
|
|
static int
|
|
msdosfs_fhtovp(mp, fhp, vpp)
|
|
struct mount *mp;
|
|
struct fid *fhp;
|
|
struct vnode **vpp;
|
|
{
|
|
struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
|
|
struct defid *defhp = (struct defid *) fhp;
|
|
struct denode *dep;
|
|
int error;
|
|
|
|
error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep);
|
|
if (error) {
|
|
*vpp = NULLVP;
|
|
return (error);
|
|
}
|
|
*vpp = DETOV(dep);
|
|
vnode_create_vobject(*vpp, dep->de_FileSize, curthread);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
msdosfs_vptofh(vp, fhp)
|
|
struct vnode *vp;
|
|
struct fid *fhp;
|
|
{
|
|
struct denode *dep;
|
|
struct defid *defhp;
|
|
|
|
dep = VTODE(vp);
|
|
defhp = (struct defid *)fhp;
|
|
defhp->defid_len = sizeof(struct defid);
|
|
defhp->defid_dirclust = dep->de_dirclust;
|
|
defhp->defid_dirofs = dep->de_diroffset;
|
|
/* defhp->defid_gen = dep->de_gen; */
|
|
return (0);
|
|
}
|
|
|
|
static struct vfsops msdosfs_vfsops = {
|
|
.vfs_fhtovp = msdosfs_fhtovp,
|
|
.vfs_init = msdosfs_init,
|
|
.vfs_mount = msdosfs_mount,
|
|
.vfs_cmount = msdosfs_cmount,
|
|
.vfs_root = msdosfs_root,
|
|
.vfs_statfs = msdosfs_statfs,
|
|
.vfs_sync = msdosfs_sync,
|
|
.vfs_uninit = msdosfs_uninit,
|
|
.vfs_unmount = msdosfs_unmount,
|
|
.vfs_vptofh = msdosfs_vptofh,
|
|
};
|
|
|
|
VFS_SET(msdosfs_vfsops, msdosfs, 0);
|
|
MODULE_VERSION(msdosfs, 1);
|