/* $NetBSD: msdosfs_vfsops.c,v 1.22.2.1 2005/04/29 11:29:22 kent Exp $ */
/*-
* Copyright (C) 1994, 1995, 1997 Wolfgang Solfrank.
* Copyright (C) 1994, 1995, 1997 TooLs GmbH.
* All rights reserved.
* Original code by Paul Popelka (paulp@uts.amdahl.com) (see below).
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by TooLs GmbH.
* 4. The name of TooLs GmbH may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Written by Paul Popelka (paulp@uts.amdahl.com)
*
* You can do anything you want with this software, just don't say you wrote
* it, and don't remove this notice.
*
* This software is provided "as is".
*
* The author supplies this software to be publicly redistributed on the
* understanding that the author is not responsible for the correct
* functioning of this software in any circumstances and is not liable for
* any damages caused by this software.
*
* October 1992
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: msdosfs_vfsops.c,v 1.22.2.1 2005/04/29 11:29:22 kent Exp $");
#if defined(_KERNEL_OPT)
#include "opt_quota.h"
#include "opt_compat_netbsd.h"
#endif
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/sysctl.h>
#include <sys/namei.h>
#include <sys/proc.h>
#include <sys/kernel.h>
#include <sys/vnode.h>
#include <miscfs/specfs/specdev.h> /* XXX */ /* defines v_rdev */
#include <sys/mount.h>
#include <sys/buf.h>
#include <sys/file.h>
#include <sys/device.h>
#include <sys/disklabel.h>
#include <sys/ioctl.h>
#include <sys/malloc.h>
#include <sys/dirent.h>
#include <sys/stat.h>
#include <sys/conf.h>
#include <fs/msdosfs/bpb.h>
#include <fs/msdosfs/bootsect.h>
#include <fs/msdosfs/direntry.h>
#include <fs/msdosfs/denode.h>
#include <fs/msdosfs/msdosfsmount.h>
#include <fs/msdosfs/fat.h>
#define MSDOSFS_NAMEMAX(pmp) \
(pmp)->pm_flags & MSDOSFSMNT_LONGNAME ? WIN_MAXLEN : 12
int msdosfs_mountroot __P((void));
int msdosfs_mount __P((struct mount *, const char *, void *,
struct nameidata *, struct proc *));
int msdosfs_start __P((struct mount *, int, struct proc *));
int msdosfs_unmount __P((struct mount *, int, struct proc *));
int msdosfs_root __P((struct mount *, struct vnode **));
int msdosfs_quotactl __P((struct mount *, int, uid_t, void *, struct proc *));
int msdosfs_statvfs __P((struct mount *, struct statvfs *, struct proc *));
int msdosfs_sync __P((struct mount *, int, struct ucred *, struct proc *));
int msdosfs_vget __P((struct mount *, ino_t, struct vnode **));
int msdosfs_fhtovp __P((struct mount *, struct fid *, struct vnode **));
int msdosfs_checkexp __P((struct mount *, struct mbuf *, int *,
struct ucred **));
int msdosfs_vptofh __P((struct vnode *, struct fid *));
int msdosfs_mountfs __P((struct vnode *, struct mount *, struct proc *,
struct msdosfs_args *));
static int update_mp __P((struct mount *, struct msdosfs_args *));
MALLOC_DEFINE(M_MSDOSFSMNT, "MSDOSFS mount", "MSDOS FS mount structure");
MALLOC_DEFINE(M_MSDOSFSFAT, "MSDOSFS fat", "MSDOS FS fat table");
#define ROOTNAME "root_device"
extern const struct vnodeopv_desc msdosfs_vnodeop_opv_desc;
const struct vnodeopv_desc * const msdosfs_vnodeopv_descs[] = {
&msdosfs_vnodeop_opv_desc,
NULL,
};
struct vfsops msdosfs_vfsops = {
MOUNT_MSDOS,
msdosfs_mount,
msdosfs_start,
msdosfs_unmount,
msdosfs_root,
msdosfs_quotactl,
msdosfs_statvfs,
msdosfs_sync,
msdosfs_vget,
msdosfs_fhtovp,
msdosfs_vptofh,
msdosfs_init,
msdosfs_reinit,
msdosfs_done,
NULL,
msdosfs_mountroot,
msdosfs_checkexp,
(int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp,
vfs_stdextattrctl,
msdosfs_vnodeopv_descs,
};
VFS_ATTACH(msdosfs_vfsops);
static int
update_mp(mp, argp)
struct mount *mp;
struct msdosfs_args *argp;
{
struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
int error;
pmp->pm_gid = argp->gid;
pmp->pm_uid = argp->uid;
pmp->pm_mask = argp->mask & ALLPERMS;
pmp->pm_dirmask = argp->dirmask & ALLPERMS;
pmp->pm_gmtoff = argp->gmtoff;
pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT;
/*
* GEMDOS knows nothing (yet) about win95
*/
if (pmp->pm_flags & MSDOSFSMNT_GEMDOSFS)
pmp->pm_flags |= MSDOSFSMNT_NOWIN95;
if (pmp->pm_flags & MSDOSFSMNT_NOWIN95)
pmp->pm_flags |= MSDOSFSMNT_SHORTNAME;
else if (!(pmp->pm_flags &
(MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) {
struct vnode *rootvp;
/*
* Try to divine whether to support Win'95 long filenames
*/
if (FAT32(pmp))
pmp->pm_flags |= MSDOSFSMNT_LONGNAME;
else {
if ((error = msdosfs_root(mp, &rootvp)) != 0)
return error;
pmp->pm_flags |= findwin95(VTODE(rootvp))
? MSDOSFSMNT_LONGNAME
: MSDOSFSMNT_SHORTNAME;
vput(rootvp);
}
}
mp->mnt_stat.f_namemax = MSDOSFS_NAMEMAX(pmp);
return 0;
}
int
msdosfs_mountroot()
{
struct mount *mp;
struct proc *p = curproc; /* XXX */
int error;
struct msdosfs_args args;
if (root_device->dv_class != DV_DISK)
return (ENODEV);
if ((error = vfs_rootmountalloc(MOUNT_MSDOS, "root_device", &mp))) {
vrele(rootvp);
return (error);
}
args.flags = MSDOSFSMNT_VERSIONED;
args.uid = 0;
args.gid = 0;
args.mask = 0777;
args.version = MSDOSFSMNT_VERSION;
args.dirmask = 0777;
if ((error = msdosfs_mountfs(rootvp, mp, p, &args)) != 0) {
mp->mnt_op->vfs_refcount--;
vfs_unbusy(mp);
free(mp, M_MOUNT);
return (error);
}
if ((error = update_mp(mp, &args)) != 0) {
(void)msdosfs_unmount(mp, 0, p);
vfs_unbusy(mp);
free(mp, M_MOUNT);
vrele(rootvp);
return (error);
}
simple_lock(&mountlist_slock);
CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list);
simple_unlock(&mountlist_slock);
(void)msdosfs_statvfs(mp, &mp->mnt_stat, p);
vfs_unbusy(mp);
return (0);
}
/*
* mp - path - addr in user space of mount point (ie /usr or whatever)
* data - addr in user space of mount params including the name of the block
* special file to treat as a filesystem.
*/
int
msdosfs_mount(mp, path, data, ndp, p)
struct mount *mp;
const char *path;
void *data;
struct nameidata *ndp;
struct proc *p;
{
struct vnode *devvp; /* vnode for blk device to mount */
struct msdosfs_args args; /* will hold data from mount request */
/* msdosfs specific mount control block */
struct msdosfsmount *pmp = NULL;
int error, flags;
mode_t accessmode;
if (mp->mnt_flag & MNT_GETARGS) {
pmp = VFSTOMSDOSFS(mp);
if (pmp == NULL)
return EIO;
args.fspec = NULL;
args.uid = pmp->pm_uid;
args.gid = pmp->pm_gid;
args.mask = pmp->pm_mask;
args.flags = pmp->pm_flags;
args.version = MSDOSFSMNT_VERSION;
args.dirmask = pmp->pm_dirmask;
args.gmtoff = pmp->pm_gmtoff;
vfs_showexport(mp, &args.export, &pmp->pm_export);
return copyout(&args, data, sizeof(args));
}
error = copyin(data, &args, sizeof(struct msdosfs_args));
if (error)
return (error);
/*
* If not versioned (i.e. using old mount_msdos(8)), fill in
* the additional structure items with suitable defaults.
*/
if ((args.flags & MSDOSFSMNT_VERSIONED) == 0) {
args.version = 1;
args.dirmask = args.mask;
}
/*
* Reset GMT offset for pre-v3 mount structure args.
*/
if (args.version < 3)
args.gmtoff = 0;
/*
* If updating, check whether changing from read-only to
* read/write; if there is no device name, that's all we do.
*/
if (mp->mnt_flag & MNT_UPDATE) {
pmp = VFSTOMSDOSFS(mp);
error = 0;
if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_flag & MNT_RDONLY)) {
flags = WRITECLOSE;
if (mp->mnt_flag & MNT_FORCE)
flags |= FORCECLOSE;
error = vflush(mp, NULLVP, flags);
}
if (!error && (mp->mnt_flag & MNT_RELOAD))
/* not yet implemented */
error = EOPNOTSUPP;
if (error)
return (error);
if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_iflag & IMNT_WANTRDWR)) {
/*
* If upgrade to read-write by non-root, then verify
* that user has necessary permissions on the device.
*/
if (p->p_ucred->cr_uid != 0) {
devvp = pmp->pm_devvp;
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
error = VOP_ACCESS(devvp, VREAD | VWRITE,
p->p_ucred, p);
VOP_UNLOCK(devvp, 0);
if (error)
return (error);
}
pmp->pm_flags &= ~MSDOSFSMNT_RONLY;
}
if (args.fspec == 0) {
#ifdef __notyet__ /* doesn't work correctly with current mountd XXX */
if (args.flags & MSDOSFSMNT_MNTOPT) {
pmp->pm_flags &= ~MSDOSFSMNT_MNTOPT;
pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT;
if (pmp->pm_flags & MSDOSFSMNT_NOWIN95)
pmp->pm_flags |= MSDOSFSMNT_SHORTNAME;
}
#endif
/*
* Process export requests.
*/
return (vfs_export(mp, &pmp->pm_export, &args.export));
}
}
/*
* Not an update, or updating the name: look up the name
* and verify that it refers to a sensible block device.
*/
NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p);
if ((error = namei(ndp)) != 0)
return (error);
devvp = ndp->ni_vp;
if (devvp->v_type != VBLK) {
vrele(devvp);
return (ENOTBLK);
}
if (bdevsw_lookup(devvp->v_rdev) == NULL) {
vrele(devvp);
return (ENXIO);
}
/*
* If mount by non-root, then verify that user has necessary
* permissions on the device.
*/
if (p->p_ucred->cr_uid != 0) {
accessmode = VREAD;
if ((mp->mnt_flag & MNT_RDONLY) == 0)
accessmode |= VWRITE;
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
error = VOP_ACCESS(devvp, accessmode, p->p_ucred, p);
VOP_UNLOCK(devvp, 0);
if (error) {
vrele(devvp);
return (error);
}
}
if ((mp->mnt_flag & MNT_UPDATE) == 0) {
int flags;
/*
* Disallow multiple mounts of the same device.
* Disallow mounting of a device that is currently in use
* (except for root, which might share swap device for
* miniroot).
*/
error = vfs_mountedon(devvp);
if (error)
goto fail;
if (vcount(devvp) > 1 && devvp != rootvp) {
error = EBUSY;
goto fail;
}
if (mp->mnt_flag & MNT_RDONLY)
flags = FREAD;
else
flags = FREAD|FWRITE;
error = VOP_OPEN(devvp, flags, FSCRED, p);
if (error)
goto fail;
error = msdosfs_mountfs(devvp, mp, p, &args);
if (error) {
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
(void) VOP_CLOSE(devvp, flags, NOCRED, p);
VOP_UNLOCK(devvp, 0);
goto fail;
}
#ifdef MSDOSFS_DEBUG /* only needed for the printf below */
pmp = VFSTOMSDOSFS(mp);
#endif
} else {
vrele(devvp);
if (devvp != pmp->pm_devvp)
return (EINVAL); /* needs translation */
}
if ((error = update_mp(mp, &args)) != 0) {
msdosfs_unmount(mp, MNT_FORCE, p);
return error;
}
#ifdef MSDOSFS_DEBUG
printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap);
#endif
return set_statvfs_info(path, UIO_USERSPACE, args.fspec, UIO_USERSPACE,
mp, p);
fail:
vrele(devvp);
return (error);
}
int
msdosfs_mountfs(devvp, mp, p, argp)
struct vnode *devvp;
struct mount *mp;
struct proc *p;
struct msdosfs_args *argp;
{
struct msdosfsmount *pmp;
struct buf *bp;
dev_t dev = devvp->v_rdev;
struct partinfo dpart;
union bootsector *bsp;
struct byte_bpb33 *b33;
struct byte_bpb50 *b50;
struct byte_bpb710 *b710;
u_int8_t SecPerClust;
int ronly, error;
int bsize = 0, dtype = 0, tmp;
u_long dirsperblk;
/* Flush out any old buffers remaining from a previous use. */
if ((error = vinvalbuf(devvp, V_SAVE, p->p_ucred, p, 0, 0)) != 0)
return (error);
ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
bp = NULL; /* both used in error_exit */
pmp = NULL;
if (argp->flags & MSDOSFSMNT_GEMDOSFS) {
/*
* We need the disklabel to calculate the size of a FAT entry
* later on. Also make sure the partition contains a filesystem
* of type FS_MSDOS. This doesn't work for floppies, so we have
* to check for them too.
*
* At least some parts of the msdos fs driver seem to assume
* that the size of a disk block will always be 512 bytes.
* Let's check it...
*/
error = VOP_IOCTL(devvp, DIOCGPART, &dpart, FREAD, NOCRED, p);
if (error)
goto error_exit;
tmp = dpart.part->p_fstype;
dtype = dpart.disklab->d_type;
bsize = dpart.disklab->d_secsize;
if (bsize != 512 || (dtype!=DTYPE_FLOPPY && tmp!=FS_MSDOS)) {
error = EINVAL;
goto error_exit;
}
}
/*
* Read the boot sector of the filesystem, and then check the
* boot signature. If not a dos boot sector then error out.
*/
if ((error = bread(devvp, 0, 512, NOCRED, &bp)) != 0)
goto error_exit;
bp->b_flags |= B_AGE;
bsp = (union bootsector *)bp->b_data;
b33 = (struct byte_bpb33 *)bsp->bs33.bsBPB;
b50 = (struct byte_bpb50 *)bsp->bs50.bsBPB;
b710 = (struct byte_bpb710 *)bsp->bs710.bsBPB;
if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) {
if (bsp->bs50.bsBootSectSig0 != BOOTSIG0
|| bsp->bs50.bsBootSectSig1 != BOOTSIG1) {
error = EINVAL;
goto error_exit;
}
}
pmp = malloc(sizeof *pmp, M_MSDOSFSMNT, M_WAITOK);
memset(pmp, 0, sizeof *pmp);
pmp->pm_mountp = mp;
/*
* 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);
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;
if (!(argp->flags & MSDOSFSMNT_GEMDOSFS)) {
/* XXX - We should probably check more values here */
if (!pmp->pm_BytesPerSec || !SecPerClust
|| pmp->pm_Heads > 255 || pmp->pm_SecPerTrack > 63) {
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;
}
dirsperblk = pmp->pm_BytesPerSec / sizeof(struct direntry);
if (pmp->pm_HugeSectors > 0xffffffff / dirsperblk + 1) {
/*
* We cannot deal currently with this size of disk
* due to fileid limitations (see msdosfs_getattr and
* msdosfs_readdir)
*/
error = EINVAL;
goto error_exit;
}
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;
goto error_exit;
}
pmp->pm_fatmask = FAT32_MASK;
pmp->pm_fatmult = 4;
pmp->pm_fatdiv = 1;
pmp->pm_FATsecs = getulong(b710->bpbBigFATsecs);
/* mirrorring is enabled if the FATMIRROR bit is not set */
if ((getushort(b710->bpbExtFlags) & FATMIRROR) == 0)
pmp->pm_flags |= MSDOSFS_FATMIRROR;
else
pmp->pm_curfat = getushort(b710->bpbExtFlags) & FATNUM;
} else
pmp->pm_flags |= MSDOSFS_FATMIRROR;
if (argp->flags & MSDOSFSMNT_GEMDOSFS) {
if (FAT32(pmp)) {
/*
* GEMDOS doesn't know fat32.
*/
error = EINVAL;
goto error_exit;
}
/*
* 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
*/
if ( (SecPerClust == 0)
|| (SecPerClust & (SecPerClust - 1))
|| (pmp->pm_BytesPerSec < bsize)
|| (pmp->pm_BytesPerSec & (pmp->pm_BytesPerSec - 1))
|| (pmp->pm_HugeSectors == 0)
|| (pmp->pm_HugeSectors * (pmp->pm_BytesPerSec / bsize)
> dpart.part->p_size)
) {
error = EINVAL;
goto error_exit;
}
/*
* XXX - Many parts of the msdos fs driver seem to assume that
* the number of bytes per logical sector (BytesPerSec) will
* always be the same as the number of bytes per disk block
* Let's pretend it is.
*/
tmp = pmp->pm_BytesPerSec / bsize;
pmp->pm_BytesPerSec = bsize;
pmp->pm_HugeSectors *= tmp;
pmp->pm_HiddenSects *= tmp;
pmp->pm_ResSectors *= tmp;
pmp->pm_Sectors *= tmp;
pmp->pm_FATsecs *= tmp;
SecPerClust *= tmp;
}
pmp->pm_fatblk = pmp->pm_ResSectors;
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);
} else {
pmp->pm_rootdirblk = pmp->pm_fatblk +
(pmp->pm_FATs * pmp->pm_FATsecs);
pmp->pm_rootdirsize = (pmp->pm_RootDirEnts * sizeof(struct direntry)
+ pmp->pm_BytesPerSec - 1)
/ pmp->pm_BytesPerSec;/* in sectors */
pmp->pm_firstcluster = pmp->pm_rootdirblk + pmp->pm_rootdirsize;
}
pmp->pm_nmbrofclusters = (pmp->pm_HugeSectors - pmp->pm_firstcluster) /
SecPerClust;
pmp->pm_maxcluster = pmp->pm_nmbrofclusters + 1;
pmp->pm_fatsize = pmp->pm_FATsecs * pmp->pm_BytesPerSec;
if (argp->flags & MSDOSFSMNT_GEMDOSFS) {
if (pmp->pm_nmbrofclusters <= (0xff0 - 2)
&& (dtype == DTYPE_FLOPPY
|| (dtype == DTYPE_VND
&& (pmp->pm_Heads == 1 || pmp->pm_Heads == 2)))
) {
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;
}
} else 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;
}
}
if (FAT12(pmp))
pmp->pm_fatblocksize = 3 * pmp->pm_BytesPerSec;
else
pmp->pm_fatblocksize = MAXBSIZE;
pmp->pm_fatblocksec = pmp->pm_fatblocksize / pmp->pm_BytesPerSec;
pmp->pm_bnshift = ffs(pmp->pm_BytesPerSec) - 1;
/*
* Compute mask and shift value for isolating cluster relative byte
* offsets and cluster numbers from a file offset.
*/
pmp->pm_bpcluster = SecPerClust * pmp->pm_BytesPerSec;
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, 1024, NOCRED, &bp)) != 0)
goto error_exit;
fp = (struct fsinfo *)bp->b_data;
if (!memcmp(fp->fsisig1, "RRaA", 4)
&& !memcmp(fp->fsisig2, "rrAa", 4)
&& !memcmp(fp->fsisig3, "\0\0\125\252", 4)
&& !memcmp(fp->fsisig4, "\0\0\125\252", 4))
pmp->pm_nxtfree = getulong(fp->fsinxtfree);
else
pmp->pm_fsinfo = 0;
brelse(bp);
bp = NULL;
}
/*
* Check and validate (or perhaps invalidate?) the fsinfo structure?
* XXX
*/
if (pmp->pm_fsinfo) {
if (pmp->pm_nxtfree == (u_long)-1)
pmp->pm_fsinfo = 0;
}
/*
* Allocate memory for the bitmap of allocated clusters, and then
* fill it in.
*/
pmp->pm_inusemap = malloc(((pmp->pm_maxcluster + N_INUSEBITS - 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
pmp->pm_fmod = 1;
mp->mnt_data = pmp;
mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev;
mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_MSDOS);
mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0];
mp->mnt_stat.f_namemax = MSDOSFS_NAMEMAX(pmp);
mp->mnt_flag |= MNT_LOCAL;
mp->mnt_dev_bshift = pmp->pm_bnshift;
mp->mnt_fs_bshift = pmp->pm_cnshift;
#ifdef QUOTA
/*
* If we ever do quotas for DOS filesystems this would be a place
* to fill in the info in the msdosfsmount structure. You dolt,
* quotas on dos filesystems make no sense because files have no
* owners on dos filesystems. of course there is some empty space
* in the directory entry where we could put uid's and gid's.
*/
#endif
devvp->v_specmountpoint = mp;
return (0);
error_exit:;
if (bp)
brelse(bp);
if (pmp) {
if (pmp->pm_inusemap)
free(pmp->pm_inusemap, M_MSDOSFSFAT);
free(pmp, M_MSDOSFSMNT);
mp->mnt_data = NULL;
}
return (error);
}
int
msdosfs_start(mp, flags, p)
struct mount *mp;
int flags;
struct proc *p;
{
return (0);
}
/*
* Unmount the filesystem described by mp.
*/
int
msdosfs_unmount(mp, mntflags, p)
struct mount *mp;
int mntflags;
struct proc *p;
{
struct msdosfsmount *pmp;
int error, flags;
flags = 0;
if (mntflags & MNT_FORCE)
flags |= FORCECLOSE;
#ifdef QUOTA
#endif
if ((error = vflush(mp, NULLVP, flags)) != 0)
return (error);
pmp = VFSTOMSDOSFS(mp);
if (pmp->pm_devvp->v_type != VBAD)
pmp->pm_devvp->v_specmountpoint = NULL;
#ifdef MSDOSFS_DEBUG
{
struct vnode *vp = pmp->pm_devvp;
printf("msdosfs_umount(): just before calling VOP_CLOSE()\n");
printf("flag %08x, usecount %d, writecount %ld, holdcnt %ld\n",
vp->v_flag, vp->v_usecount, vp->v_writecount, vp->v_holdcnt);
printf("id %lu, mount %p, op %p\n",
vp->v_id, vp->v_mount, vp->v_op);
printf("freef %p, freeb %p, mount %p\n",
vp->v_freelist.tqe_next, vp->v_freelist.tqe_prev,
vp->v_mount);
printf("cleanblkhd %p, dirtyblkhd %p, numoutput %d, type %d\n",
vp->v_cleanblkhd.lh_first,
vp->v_dirtyblkhd.lh_first,
vp->v_numoutput, vp->v_type);
printf("union %p, tag %d, data[0] %08x, data[1] %08x\n",
vp->v_socket, vp->v_tag,
((u_int *)vp->v_data)[0],
((u_int *)vp->v_data)[1]);
}
#endif
vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY);
error = VOP_CLOSE(pmp->pm_devvp,
pmp->pm_flags & MSDOSFSMNT_RONLY ? FREAD : FREAD|FWRITE, NOCRED, p);
vput(pmp->pm_devvp);
free(pmp->pm_inusemap, M_MSDOSFSFAT);
free(pmp, M_MSDOSFSMNT);
mp->mnt_data = NULL;
mp->mnt_flag &= ~MNT_LOCAL;
return (error);
}
int
msdosfs_root(mp, vpp)
struct mount *mp;
struct vnode **vpp;
{
struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
struct denode *ndep;
int error;
#ifdef MSDOSFS_DEBUG
printf("msdosfs_root(); mp %p, pmp %p\n", mp, pmp);
#endif
if ((error = deget(pmp, MSDOSFSROOT, MSDOSFSROOT_OFS, &ndep)) != 0)
return (error);
*vpp = DETOV(ndep);
return (0);
}
int
msdosfs_quotactl(mp, cmds, uid, arg, p)
struct mount *mp;
int cmds;
uid_t uid;
void *arg;
struct proc *p;
{
#ifdef QUOTA
return (EOPNOTSUPP);
#else
return (EOPNOTSUPP);
#endif
}
int
msdosfs_statvfs(mp, sbp, p)
struct mount *mp;
struct statvfs *sbp;
struct proc *p;
{
struct msdosfsmount *pmp;
pmp = VFSTOMSDOSFS(mp);
sbp->f_bsize = pmp->pm_bpcluster;
sbp->f_frsize = sbp->f_bsize;
sbp->f_iosize = pmp->pm_bpcluster;
sbp->f_blocks = pmp->pm_nmbrofclusters;
sbp->f_bfree = pmp->pm_freeclustercount;
sbp->f_bavail = pmp->pm_freeclustercount;
sbp->f_bresvd = 0;
sbp->f_files = pmp->pm_RootDirEnts; /* XXX */
sbp->f_ffree = 0; /* what to put in here? */
sbp->f_favail = 0; /* what to put in here? */
sbp->f_fresvd = 0;
copy_statvfs_info(sbp, mp);
return (0);
}
int
msdosfs_sync(mp, waitfor, cred, p)
struct mount *mp;
int waitfor;
struct ucred *cred;
struct proc *p;
{
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.
*/
simple_lock(&mntvnode_slock);
loop:
for (vp = mp->mnt_vnodelist.lh_first; vp != NULL; vp = nvp) {
/*
* If the vnode that we are about to sync is no longer
* assoicated with this mount point, start over.
*/
if (vp->v_mount != mp)
goto loop;
simple_lock(&vp->v_interlock);
nvp = vp->v_mntvnodes.le_next;
dep = VTODE(vp);
if (waitfor == MNT_LAZY || vp->v_type == VNON ||
(((dep->de_flag &
(DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0) &&
(LIST_EMPTY(&vp->v_dirtyblkhd) &&
vp->v_uobj.uo_npages == 0))) {
simple_unlock(&vp->v_interlock);
continue;
}
simple_unlock(&mntvnode_slock);
error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK);
if (error) {
simple_lock(&mntvnode_slock);
if (error == ENOENT)
goto loop;
continue;
}
if ((error = VOP_FSYNC(vp, cred,
waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0, p)) != 0)
allerror = error;
vput(vp);
simple_lock(&mntvnode_slock);
}
simple_unlock(&mntvnode_slock);
/*
* Force stale file system control information to be flushed.
*/
if ((error = VOP_FSYNC(pmp->pm_devvp, cred,
waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0, p)) != 0)
allerror = error;
#ifdef QUOTA
/* qsync(mp); */
#endif
return (allerror);
}
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);
return (0);
}
int
msdosfs_checkexp(mp, nam, exflagsp, credanonp)
struct mount *mp;
struct mbuf *nam;
int *exflagsp;
struct ucred **credanonp;
{
struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
struct netcred *np;
np = vfs_export_lookup(mp, &pmp->pm_export, nam);
if (np == NULL)
return (EACCES);
*exflagsp = np->netc_exflags;
*credanonp = &np->netc_anon;
return (0);
}
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);
}
int
msdosfs_vget(mp, ino, vpp)
struct mount *mp;
ino_t ino;
struct vnode **vpp;
{
return (EOPNOTSUPP);
}
SYSCTL_SETUP(sysctl_vfs_msdosfs_setup, "sysctl vfs.msdosfs subtree setup")
{
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "vfs", NULL,
NULL, 0, NULL, 0,
CTL_VFS, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "msdosfs",
SYSCTL_DESCR("MS-DOS file system"),
NULL, 0, NULL, 0,
CTL_VFS, 4, CTL_EOL);
/*
* XXX the "4" above could be dynamic, thereby eliminating one
* more instance of the "number to vfs" mapping problem, but
* "4" is the order as taken from sys/mount.h
*/
}
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