Exemplo n.º 1
0
/*
 * Unmount the filesystem described by mp.
 */
int
msdosfs_unmount(struct mount *mp, int mntflags,struct proc *p)
{
	struct msdosfsmount *pmp;
	int error, flags;
	struct vnode *vp;

	flags = 0;
	if (mntflags & MNT_FORCE)
		flags |= FORCECLOSE;
#ifdef QUOTA
#endif
	if ((error = vflush(mp, NULLVP, flags)) != 0)
		return (error);
	pmp = VFSTOMSDOSFS(mp);
	pmp->pm_devvp->v_specmountpoint = NULL;
	vp = pmp->pm_devvp;
#ifdef MSDOSFS_DEBUG
	vprint("msdosfs_umount(): just before calling VOP_CLOSE()\n", vp);
#endif
	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
	error = VOP_CLOSE(vp,
	   pmp->pm_flags & MSDOSFSMNT_RONLY ? FREAD : FREAD|FWRITE, NOCRED, p);
	vput(vp);
	free(pmp->pm_inusemap, M_MSDOSFSFAT);
	free(pmp, M_MSDOSFSMNT);
	mp->mnt_data = (qaddr_t)0;
	mp->mnt_flag &= ~MNT_LOCAL;
	return (error);
}
Exemplo n.º 2
0
int
msdosfs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp)
{
	struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
	struct defid defh;
	struct denode *dep;
	uint32_t gen;
	int error;

	if (fhp->fid_len != sizeof(struct defid)) {
		DPRINTF(("fid_len %d %zd\n", fhp->fid_len,
		    sizeof(struct defid)));
		return EINVAL;
	}
	memcpy(&defh, fhp, sizeof(defh));
	error = msdosfs_fh_lookup(pmp, defh.defid_dirclust, defh.defid_dirofs,
	    &gen);
	if (error == 0 && gen != defh.defid_gen)
		error = ESTALE;
	if (error) {
		*vpp = NULLVP;
		return error;
	}
	error = deget(pmp, defh.defid_dirclust, defh.defid_dirofs, &dep);
	if (error) {
		DPRINTF(("deget %d\n", error));
		*vpp = NULLVP;
		return (error);
	}
	*vpp = DETOV(dep);
	return (0);
}
Exemplo n.º 3
0
static int
msdosfs_sync(struct mount *mp, int waitfor)
{
	struct vnode *vp, *nvp;
	struct thread *td;
	struct denode *dep;
	struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
	int error, allerror = 0;

	td = curthread;

	/*
	 * 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_DOOMED)) {
			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);
		vrele(vp);
		MNT_ILOCK(mp);
	}
Exemplo n.º 4
0
int
msdosfs_sync(struct mount *mp, int waitfor, kauth_cred_t cred)
{
	struct vnode *vp;
	struct vnode_iterator *marker;
	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 */
		}
	}
	fstrans_start(mp, FSTRANS_SHARED);
	/*
	 * Write back each (modified) denode.
	 */
	vfs_vnode_iterator_init(mp, &marker);
	while (vfs_vnode_iterator_next(marker, &vp)) {
		error = vn_lock(vp, LK_EXCLUSIVE);
		if (error) {
			vrele(vp);
			continue;
		}
		dep = VTODE(vp);
		if (waitfor == MNT_LAZY || vp->v_type == VNON ||
		    dep == NULL || (((dep->de_flag &
		    (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0) &&
		     (LIST_EMPTY(&vp->v_dirtyblkhd) &&
		      UVM_OBJ_IS_CLEAN(&vp->v_uobj)))) {
			vput(vp);
			continue;
		}
		if ((error = VOP_FSYNC(vp, cred,
		    waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0)) != 0)
			allerror = error;
		vput(vp);
	}
	vfs_vnode_iterator_destroy(marker);

	/*
	 * 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)) != 0)
		allerror = error;
	fstrans_done(mp);
	return (allerror);
}
Exemplo n.º 5
0
/* Initialize file number mapping structures. */
void
msdosfs_fileno_init(struct mount *mp)
{
	struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);

	RB_INIT(&pmp->pm_filenos);
	pmp->pm_nfileno = FILENO_FIRST_DYN;
	if (pmp->pm_HugeSectors > 0xffffffff /
	    (pmp->pm_BytesPerSec / sizeof(struct direntry)) + 1)
		pmp->pm_flags |= MSDOSFS_LARGEFS;
}
Exemplo n.º 6
0
static int
update_mp(struct mount *mp, struct msdosfs_args *argp)
{
	struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
	int error;
        char cs_local[ICONV_CSNMAXLEN];
        char cs_dos[ICONV_CSNMAXLEN];

	pmp->pm_gid = argp->gid;
	pmp->pm_uid = argp->uid;
	pmp->pm_mask = argp->mask & ALLPERMS;
	pmp->pm_flags |= argp->flags & MSDOSFSMNT_MNTOPT;
	if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdos_iconv) {
		bcopy(argp->cs_local, cs_local, sizeof(cs_local));
		bcopy(argp->cs_dos, cs_dos, sizeof(cs_dos));
		kprintf("local: %s dos: %s\n",argp->cs_local, argp->cs_dos);
		error = msdos_iconv->open(cs_local, ENCODING_UNICODE, &pmp->pm_w2u);
		if(error)
			return error;
		error = msdos_iconv->open(ENCODING_UNICODE, cs_local, &pmp->pm_u2w);
		if(error)
			return error;
		error = msdos_iconv->open(cs_dos, cs_local, &pmp->pm_u2d);
		if(error)
			return error;
		error = msdos_iconv->open(cs_local, cs_dos, &pmp->pm_d2u);
		if(error)
			return error;
	}

	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);
		}
	}
	return 0;
}
Exemplo n.º 7
0
/* Free 32-bit file number generation structures. */
void
msdosfs_fileno_free(struct mount *mp)
{
	struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
	struct msdosfs_fileno *mf, *next;

	for (mf = RB_MIN(msdosfs_filenotree, &pmp->pm_filenos); mf != NULL;
	    mf = next) {
		next = RB_NEXT(msdosfs_filenotree, &pmp->pm_filenos, mf);
		RB_REMOVE(msdosfs_filenotree, &pmp->pm_filenos, mf);
		free(mf, M_MSDOSFSFILENO);
	}
}
Exemplo n.º 8
0
/*
 * Unmount the filesystem described by mp.
 */
int
msdosfs_unmount(struct mount *mp, int mntflags)
{
	struct msdosfsmount *pmp;
	int error, flags;

	flags = 0;
	if (mntflags & MNT_FORCE)
		flags |= FORCECLOSE;
	if ((error = vflush(mp, NULLVP, flags)) != 0)
		return (error);
	pmp = VFSTOMSDOSFS(mp);
	if (pmp->pm_devvp->v_type != VBAD)
		spec_node_setmountedfs(pmp->pm_devvp, 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 %d, holdcnt %d\n",
		    vp->v_vflag | vp->v_iflag | vp->v_uflag, vp->v_usecount,
		    vp->v_writecount, vp->v_holdcnt);
		printf("mount %p, op %p\n",
		    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);
	(void) VOP_CLOSE(pmp->pm_devvp,
	    pmp->pm_flags & MSDOSFSMNT_RONLY ? FREAD : FREAD|FWRITE, NOCRED);
	vput(pmp->pm_devvp);
	msdosfs_fh_destroy(pmp);
	free(pmp->pm_inusemap, M_MSDOSFSFAT);
	free(pmp, M_MSDOSFSMNT);
	mp->mnt_data = NULL;
	mp->mnt_flag &= ~MNT_LOCAL;
	fstrans_unmount(mp);
	return (0);
}
Exemplo n.º 9
0
int
msdosfs_root(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);
}
Exemplo n.º 10
0
static int
msdosfs_statfs(struct mount *mp, struct statfs *sbp)
{
	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);
}
Exemplo n.º 11
0
static int
msdosfs_deget_dotdot(struct mount *mp, void *arg, int lkflags,
    struct vnode **rvp)
{
	struct deget_dotdot *dd_arg;
	struct denode *rdp;
	struct msdosfsmount *pmp;
	int error;

	pmp = VFSTOMSDOSFS(mp);
	dd_arg = arg;
	error = deget(pmp, dd_arg->cluster, dd_arg->blkoff,  &rdp);
	if (error == 0)
		*rvp = DETOV(rdp);
	return (error);
}
Exemplo n.º 12
0
int
msdosfs_fhtovp(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);
}
Exemplo n.º 13
0
static int
msdosfs_deget_dotdot(struct vnode *vp, u_long cluster, int blkoff,
    struct vnode **rvp)
{
	struct mount *mp;
	struct msdosfsmount *pmp;
	struct denode *rdp;
	int ltype, error;

	mp = vp->v_mount;
	pmp = VFSTOMSDOSFS(mp);
	ltype = VOP_ISLOCKED(vp);
	KASSERT(ltype == LK_EXCLUSIVE || ltype == LK_SHARED,
	    ("msdosfs_deget_dotdot: vp not locked"));

	error = vfs_busy(mp, MBF_NOWAIT);
	if (error != 0) {
		vfs_ref(mp);
		VOP_UNLOCK(vp, 0);
		error = vfs_busy(mp, 0);
		vn_lock(vp, ltype | LK_RETRY);
		vfs_rel(mp);
		if (error != 0)
			return (ENOENT);
		if (vp->v_iflag & VI_DOOMED) {
			vfs_unbusy(mp);
			return (ENOENT);
		}
	}
	VOP_UNLOCK(vp, 0);
	error = deget(pmp, cluster, blkoff,  &rdp);
	vfs_unbusy(mp);
	if (error == 0)
		*rvp = DETOV(rdp);
	if (*rvp != vp)
		vn_lock(vp, ltype | LK_RETRY);
	if (vp->v_iflag & VI_DOOMED) {
		if (error == 0) {
			if (*rvp == vp)
				vunref(*rvp);
			else
				vput(*rvp);
		}
		error = ENOENT;
	}
	return (error);
}
Exemplo n.º 14
0
static int
msdosfs_fhtovp(struct mount *mp, struct fid *fhp, int flags, 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);
}
Exemplo n.º 15
0
int
msdosfs_check_export(struct mount *mp, struct mbuf *nam, int *exflagsp,
    struct ucred **credanonp)
{
	struct netcred *np;
	struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);

	/*
	 * Get the export permission structure for this <mp, client> tuple.
	 */
	np = vfs_export_lookup(mp, &pmp->pm_export, nam);
	if (np == NULL)
		return (EACCES);

	*exflagsp = np->netc_exflags;
	*credanonp = &np->netc_anon;
	return (0);
}
Exemplo n.º 16
0
static int
update_mp(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 about win95 long filenames
	 */
	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 *rtvp;

		/*
		 * Try to divine whether to support Win'95 long filenames
		 */
		if (FAT32(pmp))
			pmp->pm_flags |= MSDOSFSMNT_LONGNAME;
		else {
			if ((error = msdosfs_root(mp, &rtvp)) != 0)
				return error;
			pmp->pm_flags |= findwin95(VTODE(rtvp))
				? MSDOSFSMNT_LONGNAME
					: MSDOSFSMNT_SHORTNAME;
			vput(rtvp);
		}
	}

	mp->mnt_stat.f_namemax = MSDOSFS_NAMEMAX(pmp);

	return 0;
}
Exemplo n.º 17
0
int
msdosfs_statvfs(struct mount *mp, struct statvfs *sbp)
{
	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);
}
Exemplo n.º 18
0
int
msdosfs_sync(struct mount *mp, int waitfor, struct ucred *cred, struct proc *p)
{
	struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
	struct msdosfs_sync_arg msa;
	int error;

	msa.allerror = 0;
	msa.p = p;
	msa.cred = cred;
	msa.waitfor = waitfor;

	/*
	 * 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.
	 */
	vfs_mount_foreach_vnode(mp, msdosfs_sync_vnode, &msa);

	/*
	 * Force stale file system control information to be flushed.
	 */
	if (waitfor != MNT_LAZY) {
		vn_lock(pmp->pm_devvp, LK_EXCLUSIVE | LK_RETRY, p);
		if ((error = VOP_FSYNC(pmp->pm_devvp, cred, waitfor, p)) != 0)
			msa.allerror = error;
		VOP_UNLOCK(pmp->pm_devvp, 0, p);
	}

	return (msa.allerror);
}
Exemplo n.º 19
0
/* Map a 64-bit file number into a 32-bit one. */
uint32_t
msdosfs_fileno_map(struct mount *mp, uint64_t fileno)
{
	struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
	struct msdosfs_fileno key, *mf, *tmf;
	uint32_t mapped;

	if ((pmp->pm_flags & MSDOSFS_LARGEFS) == 0) {
		KASSERT((uint32_t)fileno == fileno,
		    ("fileno >32 bits but not a large fs?"));
		return ((uint32_t)fileno);
	}
	if (fileno < FILENO_FIRST_DYN)
		return ((uint32_t)fileno);
	MSDOSFS_LOCK_MP(pmp);
	key.mf_fileno64 = fileno;
	mf = RB_FIND(msdosfs_filenotree, &pmp->pm_filenos, &key);
	if (mf != NULL) {
		mapped = mf->mf_fileno32;
		MSDOSFS_UNLOCK_MP(pmp);
		return (mapped);
	}
	if (pmp->pm_nfileno < FILENO_FIRST_DYN)
		panic("msdosfs_fileno_map: wraparound");
	MSDOSFS_UNLOCK_MP(pmp);
	mf = malloc(sizeof(*mf), M_MSDOSFSFILENO, M_WAITOK);
	MSDOSFS_LOCK_MP(pmp);
	tmf = RB_FIND(msdosfs_filenotree, &pmp->pm_filenos, &key);
	if (tmf != NULL) {
		mapped = tmf->mf_fileno32;
		MSDOSFS_UNLOCK_MP(pmp);
		free(mf, M_MSDOSFSFILENO);
		return (mapped);
	}
	mf->mf_fileno64 = fileno;
	mapped = mf->mf_fileno32 = pmp->pm_nfileno++;
	RB_INSERT(msdosfs_filenotree, &pmp->pm_filenos, mf);
	MSDOSFS_UNLOCK_MP(pmp);
	return (mapped);
}
Exemplo n.º 20
0
int
msdosfs_statfs(struct mount *mp, struct statfs *sbp, struct proc *p)
{
	struct msdosfsmount *pmp;

	pmp = VFSTOMSDOSFS(mp);
	sbp->f_bsize = pmp->pm_bpcluster;
	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_files = pmp->pm_RootDirEnts;			/* XXX */
	sbp->f_ffree = 0;	/* what to put in here? */
	if (sbp != &mp->mnt_stat) {
		bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
		bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
		bcopy(&mp->mnt_stat.mount_info.msdosfs_args,
		    &sbp->mount_info.msdosfs_args, sizeof(struct msdosfs_args));
	}
	strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN);
	return (0);
}
Exemplo n.º 21
0
int
msdosfs_vptofh(struct vnode *vp, struct fid *fhp, size_t *fh_size)
{
	struct msdosfsmount *pmp = VFSTOMSDOSFS(vp->v_mount);
	struct denode *dep;
	struct defid defh;
	int error;

	if (*fh_size < sizeof(struct defid)) {
		*fh_size = sizeof(struct defid);
		return E2BIG;
	}
	*fh_size = sizeof(struct defid);
	dep = VTODE(vp);
	memset(&defh, 0, sizeof(defh));
	defh.defid_len = sizeof(struct defid);
	defh.defid_dirclust = dep->de_dirclust;
	defh.defid_dirofs = dep->de_diroffset;
	error = msdosfs_fh_enter(pmp, dep->de_dirclust, dep->de_diroffset,
	     &defh.defid_gen);
	if (error == 0)
		memcpy(fhp, &defh, sizeof(defh));
	return error;
}
Exemplo n.º 22
0
static int
update_mp(struct mount *mp, struct thread *td)
{
	struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
	void *dos, *win, *local;
	int error, v;

	if (!vfs_getopt(mp->mnt_optnew, "kiconv", NULL, NULL)) {
		if (msdosfs_iconv != NULL) {
			error = vfs_getopt(mp->mnt_optnew,
			    "cs_win", &win, NULL);
			if (!error)
				error = vfs_getopt(mp->mnt_optnew,
				    "cs_local", &local, NULL);
			if (!error)
				error = vfs_getopt(mp->mnt_optnew,
				    "cs_dos", &dos, NULL);
			if (!error) {
				msdosfs_iconv->open(win, local, &pmp->pm_u2w);
				msdosfs_iconv->open(local, win, &pmp->pm_w2u);
				msdosfs_iconv->open(dos, local, &pmp->pm_u2d);
				msdosfs_iconv->open(local, dos, &pmp->pm_d2u);
			}
			if (error != 0)
				return (error);
		} else {
			pmp->pm_w2u = NULL;
			pmp->pm_u2w = NULL;
			pmp->pm_d2u = NULL;
			pmp->pm_u2d = NULL;
		}
	}

	if (vfs_scanopt(mp->mnt_optnew, "gid", "%d", &v) == 1)
		pmp->pm_gid = v;
	if (vfs_scanopt(mp->mnt_optnew, "uid", "%d", &v) == 1)
		pmp->pm_uid = v;
	if (vfs_scanopt(mp->mnt_optnew, "mask", "%d", &v) == 1)
		pmp->pm_mask = v & ALLPERMS;
	if (vfs_scanopt(mp->mnt_optnew, "dirmask", "%d", &v) == 1)
		pmp->pm_dirmask = v & ALLPERMS;
	vfs_flagopt(mp->mnt_optnew, "shortname",
	    &pmp->pm_flags, MSDOSFSMNT_SHORTNAME);
	vfs_flagopt(mp->mnt_optnew, "shortnames",
	    &pmp->pm_flags, MSDOSFSMNT_SHORTNAME);
	vfs_flagopt(mp->mnt_optnew, "longname",
	    &pmp->pm_flags, MSDOSFSMNT_LONGNAME);
	vfs_flagopt(mp->mnt_optnew, "longnames",
	    &pmp->pm_flags, MSDOSFSMNT_LONGNAME);
	vfs_flagopt(mp->mnt_optnew, "kiconv",
	    &pmp->pm_flags, MSDOSFSMNT_KICONV);

	if (vfs_getopt(mp->mnt_optnew, "nowin95", NULL, NULL) == 0)
		pmp->pm_flags |= MSDOSFSMNT_NOWIN95;
	else
		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, LK_EXCLUSIVE, &rootvp)) != 0)
				return error;
			pmp->pm_flags |= findwin95(VTODE(rootvp)) ?
			    MSDOSFSMNT_LONGNAME : MSDOSFSMNT_SHORTNAME;
			vput(rootvp);
		}
	}
	return 0;
}
Exemplo n.º 23
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.
 */
static int
msdosfs_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred)
{
	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;
	size_t size;
	int error, flags;
	mode_t accessmode;
	struct nlookupdata nd;

	error = copyin(data, (caddr_t)&args, sizeof(struct msdosfs_args));
	if (error)
		return (error);
	if (args.magic != MSDOSFS_ARGSMAGIC)
		args.flags = 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, 0, flags);
			if (error == 0) {
				devvp = pmp->pm_devvp;
				VOP_OPEN(devvp, FREAD, FSCRED, NULL);
				VOP_CLOSE(devvp, FREAD|FWRITE);
				pmp->pm_flags |= MSDOSFSMNT_RONLY;
			}
		}
		if (!error && (mp->mnt_flag & MNT_RELOAD))
			/* not yet implemented */
			error = EOPNOTSUPP;
		if (error)
			return (error);
		if ((pmp->pm_flags & MSDOSFSMNT_RONLY) && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
			/*
			 * If upgrade to read-write by non-root, then verify
			 * that user has necessary permissions on the device.
			 */
			devvp = pmp->pm_devvp;
			vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
			if (cred->cr_uid != 0) {
				error = VOP_EACCESS(devvp, VREAD | VWRITE, cred);
				if (error) {
					vn_unlock(devvp);
					return (error);
				}
			}
			VOP_OPEN(devvp, FREAD|FWRITE, FSCRED, NULL);
			VOP_CLOSE(devvp, FREAD);
			vn_unlock(devvp);
			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));
		}
	}
Exemplo n.º 24
0
/*
 * Unmount the filesystem described by mp.
 */
static int
msdosfs_unmount(struct mount *mp, int mntflags)
{
	struct msdosfsmount *pmp;
	int error, flags;

	error = flags = 0;
	pmp = VFSTOMSDOSFS(mp);
	if ((pmp->pm_flags & MSDOSFSMNT_RONLY) == 0)
		error = msdosfs_sync(mp, MNT_WAIT);
	if ((mntflags & MNT_FORCE) != 0)
		flags |= FORCECLOSE;
	else if (error != 0)
		return (error);
	error = vflush(mp, 0, flags, curthread);
	if (error != 0 && error != ENXIO)
		return (error);
	if ((pmp->pm_flags & MSDOSFSMNT_RONLY) == 0) {
		error = markvoldirty(pmp, 0);
		if (error && error != ENXIO) {
			(void)markvoldirty(pmp, 1);
			return (error);
		}
	}
	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);
	}

#ifdef MSDOSFS_DEBUG
	{
		struct vnode *vp = pmp->pm_devvp;
		struct bufobj *bo;

		bo = &vp->v_bufobj;
		BO_LOCK(bo);
		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_actfreelist), vp->v_actfreelist.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);
		BO_UNLOCK(bo);
	}
#endif
	DROP_GIANT();
	if (pmp->pm_devvp->v_type == VCHR && pmp->pm_devvp->v_rdev != NULL)
		pmp->pm_devvp->v_rdev->si_mountpt = NULL;
	g_topology_lock();
	g_vfs_close(pmp->pm_cp);
	g_topology_unlock();
	PICKUP_GIANT();
	vrele(pmp->pm_devvp);
	dev_rel(pmp->pm_dev);
	free(pmp->pm_inusemap, M_MSDOSFSFAT);
	if (pmp->pm_flags & MSDOSFS_LARGEFS)
		msdosfs_fileno_free(mp);
	lockdestroy(&pmp->pm_fatlock);
	free(pmp, M_MSDOSFSMNT);
	mp->mnt_data = NULL;
	MNT_ILOCK(mp);
	mp->mnt_flag &= ~MNT_LOCAL;
	MNT_IUNLOCK(mp);
	return (error);
}
Exemplo n.º 25
0
int
msdosfs_sync(struct mount *mp, int waitfor, kauth_cred_t cred)
{
	struct vnode *vp, *mvp;
	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 */
		}
	}
	/* Allocate a marker vnode. */
	mvp = vnalloc(mp);
	fstrans_start(mp, FSTRANS_SHARED);
	/*
	 * Write back each (modified) denode.
	 */
	mutex_enter(&mntvnode_lock);
loop:
	for (vp = TAILQ_FIRST(&mp->mnt_vnodelist); vp; vp = vunmark(mvp)) {
		vmark(mvp, vp);
		if (vp->v_mount != mp || vismarker(vp))
			continue;
		mutex_enter(vp->v_interlock);
		dep = VTODE(vp);
		if (waitfor == MNT_LAZY || vp->v_type == VNON ||
		    dep == NULL || (((dep->de_flag &
		    (DE_ACCESS | DE_CREATE | DE_UPDATE | DE_MODIFIED)) == 0) &&
		     (LIST_EMPTY(&vp->v_dirtyblkhd) &&
		      UVM_OBJ_IS_CLEAN(&vp->v_uobj)))) {
			mutex_exit(vp->v_interlock);
			continue;
		}
		mutex_exit(&mntvnode_lock);
		error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT);
		if (error) {
			mutex_enter(&mntvnode_lock);
			if (error == ENOENT) {
				(void)vunmark(mvp);
				goto loop;
			}
			continue;
		}
		if ((error = VOP_FSYNC(vp, cred,
		    waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0)) != 0)
			allerror = error;
		vput(vp);
		mutex_enter(&mntvnode_lock);
	}
	mutex_exit(&mntvnode_lock);
	vnfree(mvp);

	/*
	 * 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)) != 0)
		allerror = error;
	fstrans_done(mp);
	return (allerror);
}
Exemplo n.º 26
0
/*
 * Renames on files require moving the denode to a new hash queue since the
 * denode's location is used to compute which hash queue to put the file
 * in. Unless it is a rename in place.  For example "mv a b".
 *
 * What follows is the basic algorithm:
 *
 * if (file move) {
 *	if (dest file exists) {
 *		remove dest file
 *	}
 *	if (dest and src in same directory) {
 *		rewrite name in existing directory slot
 *	} else {
 *		write new entry in dest directory
 *		update offset and dirclust in denode
 *		move denode to new hash chain
 *		clear old directory entry
 *	}
 * } else {
 *	directory move
 *	if (dest directory exists) {
 *		if (dest is not empty) {
 *			return ENOTEMPTY
 *		}
 *		remove dest directory
 *	}
 *	if (dest and src in same directory) {
 *		rewrite name in existing entry
 *	} else {
 *		be sure dest is not a child of src directory
 *		write entry in dest directory
 *		update "." and ".." in moved directory
 *		update offset and dirclust in denode
 *		move denode to new hash chain
 *		clear old directory entry for moved directory
 *	}
 * }
 *
 * On entry:
 *	source's parent directory is unlocked
 *	source file or directory is unlocked
 *	destination's parent directory is locked
 *	destination file or directory is locked if it exists
 *
 * On exit:
 *	all denodes should be released
 *
 * Notes:
 * I'm not sure how the memory containing the pathnames pointed at by the
 * componentname structures is freed, there may be some memory bleeding
 * for each rename done.
 */
int
msdosfs_rename(void *v)
{
	struct vop_rename_args *ap = v;
	struct vnode *tvp = ap->a_tvp;
	struct vnode *tdvp = ap->a_tdvp;
	struct vnode *fvp = ap->a_fvp;
	struct vnode *fdvp = ap->a_fdvp;
	struct componentname *tcnp = ap->a_tcnp;
	struct componentname *fcnp = ap->a_fcnp;
	struct proc *p = curproc; /* XXX */
	struct denode *ip, *xp, *dp, *zp;
	u_char toname[11], oldname[11];
	uint32_t from_diroffset, to_diroffset;
	u_char to_count;
	int doingdirectory = 0, newparent = 0;
	int error;
	uint32_t cn, pcl;
	daddr64_t bn;
	struct msdosfsmount *pmp;
	struct direntry *dotdotp;
	struct buf *bp;

	pmp = VFSTOMSDOSFS(fdvp->v_mount);

#ifdef DIAGNOSTIC
	if ((tcnp->cn_flags & HASBUF) == 0 ||
	    (fcnp->cn_flags & HASBUF) == 0)
		panic("msdosfs_rename: no name");
#endif
	/*
	 * Check for cross-device rename.
	 */
	if ((fvp->v_mount != tdvp->v_mount) ||
	    (tvp && (fvp->v_mount != tvp->v_mount))) {
		error = EXDEV;
abortit:
		VOP_ABORTOP(tdvp, tcnp);
		if (tdvp == tvp)
			vrele(tdvp);
		else
			vput(tdvp);
		if (tvp)
			vput(tvp);
		VOP_ABORTOP(fdvp, fcnp);
		vrele(fdvp);
		vrele(fvp);
		return (error);
	}
	
	/*
	 * If source and dest are the same, do nothing.
	 */
	if (tvp == fvp) {
		error = 0;
		goto abortit;
	}

	/* */
	if ((error = vn_lock(fvp, LK_EXCLUSIVE | LK_RETRY, p)) != 0)
		goto abortit;
	dp = VTODE(fdvp);
	ip = VTODE(fvp);

	/*
	 * Be sure we are not renaming ".", "..", or an alias of ".". This
	 * leads to a crippled directory tree.  It's pretty tough to do a
	 * "ls" or "pwd" with the "." directory entry missing, and "cd .."
	 * doesn't work if the ".." entry is missing.
	 */
	if (ip->de_Attributes & ATTR_DIRECTORY) {
		/*
		 * Avoid ".", "..", and aliases of "." for obvious reasons.
		 */
		if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
		    dp == ip ||
		    (fcnp->cn_flags & ISDOTDOT) ||
		    (tcnp->cn_flags & ISDOTDOT) ||
		    (ip->de_flag & DE_RENAME)) {
			VOP_UNLOCK(fvp, 0, p);
			error = EINVAL;
			goto abortit;
		}
		ip->de_flag |= DE_RENAME;
		doingdirectory++;
	}

	/*
	 * When the target exists, both the directory
	 * and target vnodes are returned locked.
	 */
	dp = VTODE(tdvp);
	xp = tvp ? VTODE(tvp) : NULL;
	/*
	 * Remember direntry place to use for destination
	 */
	to_diroffset = dp->de_fndoffset;
	to_count = dp->de_fndcnt;

	/*
	 * If ".." must be changed (ie the directory gets a new
	 * parent) then the source directory must not be in the
	 * directory hierarchy above the target, as this would
	 * orphan everything below the source directory. Also
	 * the user must have write permission in the source so
	 * as to be able to change "..". We must repeat the call
	 * to namei, as the parent directory is unlocked by the
	 * call to doscheckpath().
	 */
	error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_proc);
	VOP_UNLOCK(fvp, 0, p);
	if (VTODE(fdvp)->de_StartCluster != VTODE(tdvp)->de_StartCluster)
		newparent = 1;
	vrele(fdvp);
	if (doingdirectory && newparent) {
		if (error)	/* write access check above */
			goto bad1;
		if (xp != NULL)
			vput(tvp);
		/*
		 * doscheckpath() vput()'s dp,
		 * so we have to do a relookup afterwards
		 */
		if ((error = doscheckpath(ip, dp)) != 0)
			goto out;
		if ((tcnp->cn_flags & SAVESTART) == 0)
			panic("msdosfs_rename: lost to startdir");
		if ((error = vfs_relookup(tdvp, &tvp, tcnp)) != 0)
			goto out;
		dp = VTODE(tdvp);
		xp = tvp ? VTODE(tvp) : NULL;
	}

	if (xp != NULL) {
		/*
		 * Target must be empty if a directory and have no links
		 * to it. Also, ensure source and target are compatible
		 * (both directories, or both not directories).
		 */
		if (xp->de_Attributes & ATTR_DIRECTORY) {
			if (!dosdirempty(xp)) {
				error = ENOTEMPTY;
				goto bad1;
			}
			if (!doingdirectory) {
				error = ENOTDIR;
				goto bad1;
			}
			cache_purge(tdvp);
		} else if (doingdirectory) {
			error = EISDIR;
			goto bad1;
		}
		if ((error = removede(dp, xp)) != 0)
			goto bad1;
		vput(tvp);
		xp = NULL;
	}

	/*
	 * Convert the filename in tcnp into a dos filename. We copy this
	 * into the denode and directory entry for the destination
	 * file/directory.
	 */
	if ((error = uniqdosname(VTODE(tdvp), tcnp, toname)) != 0)
		goto bad1;

	/*
	 * Since from wasn't locked at various places above,
	 * have to do a relookup here.
	 */
	fcnp->cn_flags &= ~MODMASK;
	fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
	if ((fcnp->cn_flags & SAVESTART) == 0)
		panic("msdosfs_rename: lost from startdir");
	if (!newparent)
		VOP_UNLOCK(tdvp, 0, p);
	(void) vfs_relookup(fdvp, &fvp, fcnp);
	if (fvp == NULL) {
		/*
		 * From name has disappeared.
		 */
		if (doingdirectory)
			panic("rename: lost dir entry");
		vrele(ap->a_fvp);
		if (newparent)
			VOP_UNLOCK(tdvp, 0, p);
		vrele(tdvp);
		return 0;
	}
	xp = VTODE(fvp);
	zp = VTODE(fdvp);
	from_diroffset = zp->de_fndoffset;

	/*
	 * Ensure that the directory entry still exists and has not
	 * changed till now. If the source is a file the entry may
	 * have been unlinked or renamed. In either case there is
	 * no further work to be done. If the source is a directory
	 * then it cannot have been rmdir'ed or renamed; this is
	 * prohibited by the DE_RENAME flag.
	 */
	if (xp != ip) {
		if (doingdirectory)
			panic("rename: lost dir entry");
		vrele(ap->a_fvp);
		if (newparent)
			VOP_UNLOCK(fdvp, 0, p);
		xp = NULL;
	} else {
		vrele(fvp);
		xp = NULL;

		/*
		 * First write a new entry in the destination
		 * directory and mark the entry in the source directory
		 * as deleted.  Then move the denode to the correct hash
		 * chain for its new location in the filesystem.  And, if
		 * we moved a directory, then update its .. entry to point
		 * to the new parent directory.
		 */
		bcopy(ip->de_Name, oldname, 11);
		bcopy(toname, ip->de_Name, 11);	/* update denode */
		dp->de_fndoffset = to_diroffset;
		dp->de_fndcnt = to_count;
		error = createde(ip, dp, (struct denode **)0, tcnp);
		if (error) {
			bcopy(oldname, ip->de_Name, 11);
			if (newparent)
				VOP_UNLOCK(fdvp, 0, p);
			goto bad;
		}
		ip->de_refcnt++;
		zp->de_fndoffset = from_diroffset;
		if ((error = removede(zp, ip)) != 0) {
			/* XXX should really panic here, fs is corrupt */
			if (newparent)
				VOP_UNLOCK(fdvp, 0, p);
			goto bad;
		}

		cache_purge(fvp);

		if (!doingdirectory) {
			error = pcbmap(dp, de_cluster(pmp, to_diroffset), 0,
				       &ip->de_dirclust, 0);
			if (error) {
				/* XXX should really panic here, fs is corrupt */
				if (newparent)
					VOP_UNLOCK(fdvp, 0, p);
				goto bad;
			}
			if (ip->de_dirclust != MSDOSFSROOT)
				ip->de_diroffset = to_diroffset & pmp->pm_crbomask;
		}
		reinsert(ip);
		if (newparent)
			VOP_UNLOCK(fdvp, 0, p);
	}

	/*
	 * If we moved a directory to a new parent directory, then we must
	 * fixup the ".." entry in the moved directory.
	 */
	if (doingdirectory && newparent) {
		cn = ip->de_StartCluster;
		if (cn == MSDOSFSROOT) {
			/* this should never happen */
			panic("msdosfs_rename: updating .. in root directory?");
		} else
			bn = cntobn(pmp, cn);
		error = bread(pmp->pm_devvp, bn, pmp->pm_bpcluster,
			      NOCRED, &bp);
		if (error) {
			/* XXX should really panic here, fs is corrupt */
			brelse(bp);
			goto bad;
		}
		dotdotp = (struct direntry *)bp->b_data;
		putushort(dotdotp[0].deStartCluster, cn);
		pcl = dp->de_StartCluster;
		if (FAT32(pmp) && pcl == pmp->pm_rootdirblk)
			pcl = 0;
		putushort(dotdotp[1].deStartCluster, pcl);
		if (FAT32(pmp)) {
			putushort(dotdotp[0].deHighClust, cn >> 16);
			putushort(dotdotp[1].deHighClust, pcl >> 16);
		}
		if ((error = bwrite(bp)) != 0) {
			/* XXX should really panic here, fs is corrupt */
			goto bad;
		}
	}
Exemplo n.º 27
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(struct mount *mp, const char *path, void *data, size_t *data_len)
{
	struct lwp *l = curlwp;
	struct vnode *devvp;	  /* vnode for blk device to mount */
	struct msdosfs_args *args = data; /* holds data from mount request */
	/* msdosfs specific mount control block */
	struct msdosfsmount *pmp = NULL;
	int error, flags;
	mode_t accessmode;

	if (*data_len < sizeof *args)
		return EINVAL;

	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;
		*data_len = sizeof *args;
		return 0;
	}

	/*
	 * 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) {
			DPRINTF(("vflush %d\n", 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.
			 *
			 * Permission to update a mount is checked higher, so
			 * here we presume updating the mount is okay (for
			 * example, as far as securelevel goes) which leaves us
			 * with the normal check.
			 */
			devvp = pmp->pm_devvp;
			vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
			error = kauth_authorize_system(l->l_cred,
			    KAUTH_SYSTEM_MOUNT, KAUTH_REQ_SYSTEM_MOUNT_DEVICE,
			    mp, devvp, KAUTH_ARG(VREAD | VWRITE));
			VOP_UNLOCK(devvp);
			DPRINTF(("KAUTH_REQ_SYSTEM_MOUNT_DEVICE %d\n", error));
			if (error)
				return (error);

			pmp->pm_flags &= ~MSDOSFSMNT_RONLY;
		}
		if (args->fspec == NULL) {
			DPRINTF(("missing fspec\n"));
			return EINVAL;
		}
	}
	/*
	 * Not an update, or updating the name: look up the name
	 * and verify that it refers to a sensible block device.
	 */
	error = namei_simple_user(args->fspec,
				NSM_FOLLOW_NOEMULROOT, &devvp);
	if (error != 0) {
		DPRINTF(("namei %d\n", error));
		return (error);
	}

	if (devvp->v_type != VBLK) {
		DPRINTF(("not block\n"));
		vrele(devvp);
		return (ENOTBLK);
	}
	if (bdevsw_lookup(devvp->v_rdev) == NULL) {
		DPRINTF(("no block switch\n"));
		vrele(devvp);
		return (ENXIO);
	}
	/*
	 * If mount by non-root, then verify that user has necessary
	 * permissions on the device.
	 */
	accessmode = VREAD;
	if ((mp->mnt_flag & MNT_RDONLY) == 0)
		accessmode |= VWRITE;
	vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
	error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT,
	    KAUTH_REQ_SYSTEM_MOUNT_DEVICE, mp, devvp, KAUTH_ARG(accessmode));
	VOP_UNLOCK(devvp);
	if (error) {
		DPRINTF(("KAUTH_REQ_SYSTEM_MOUNT_DEVICE %d\n", error));
		vrele(devvp);
		return (error);
	}
	if ((mp->mnt_flag & MNT_UPDATE) == 0) {
		int xflags;

		if (mp->mnt_flag & MNT_RDONLY)
			xflags = FREAD;
		else
			xflags = FREAD|FWRITE;
		vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
		error = VOP_OPEN(devvp, xflags, FSCRED);
		VOP_UNLOCK(devvp);
		if (error) {
			DPRINTF(("VOP_OPEN %d\n", error));
			goto fail;
		}
		error = msdosfs_mountfs(devvp, mp, l, args);
		if (error) {
			DPRINTF(("msdosfs_mountfs %d\n", error));
			vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
			(void) VOP_CLOSE(devvp, xflags, NOCRED);
			VOP_UNLOCK(devvp);
			goto fail;
		}
#ifdef MSDOSFS_DEBUG		/* only needed for the printf below */
		pmp = VFSTOMSDOSFS(mp);
#endif
	} else {
		vrele(devvp);
		if (devvp != pmp->pm_devvp) {
			DPRINTF(("devvp %p pmp %p\n", 
			    devvp, pmp->pm_devvp));
			return (EINVAL);	/* needs translation */
		}
	}
	if ((error = update_mp(mp, args)) != 0) {
		msdosfs_unmount(mp, MNT_FORCE);
		DPRINTF(("update_mp %d\n", error));
		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->mnt_op->vfs_name, mp, l);

fail:
	vrele(devvp);
	return (error);
}
Exemplo n.º 28
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(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;
	size_t size;
	int error, flags;
	mode_t accessmode;
	char *fspec = NULL;

	error = copyin(data, &args, sizeof(struct msdosfs_args));
	if (error)
		return (error);

	/*
	 * 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_flag & MNT_WANTRDWR)) {
			/*
			 * If upgrade to read-write by non-root, then verify
			 * that user has necessary permissions on the device.
			 */
			if (suser(p, 0) != 0) {
				devvp = pmp->pm_devvp;
				vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p);
				error = VOP_ACCESS(devvp, VREAD | VWRITE,
						   p->p_ucred, p);
				VOP_UNLOCK(devvp, 0, p);
				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_info));
		}
	}

	/*
	 * Not an update, or updating the name: look up the name
	 * and verify that it refers to a sensible block device.
	 */
	fspec = malloc(MNAMELEN, M_MOUNT, M_WAITOK);
	error = copyinstr(args.fspec, fspec, MNAMELEN - 1, &size);
	if (error)
		goto error;
	disk_map(fspec, fspec, MNAMELEN, DM_OPENBLCK);

	NDINIT(ndp, LOOKUP, FOLLOW, UIO_SYSSPACE, fspec, p);
	if ((error = namei(ndp)) != 0)
		goto error;

	devvp = ndp->ni_vp;

	if (devvp->v_type != VBLK) {
		error = ENOTBLK;
		goto error_devvp;
	}
	if (major(devvp->v_rdev) >= nblkdev) {
		error = ENXIO;
		goto error_devvp;
	}

	/*
	 * If mount by non-root, then verify that user has necessary
	 * permissions on the device.
	 */
	if (suser(p, 0) != 0) {
		accessmode = VREAD;
		if ((mp->mnt_flag & MNT_RDONLY) == 0)
			accessmode |= VWRITE;
		vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, p);
		error = VOP_ACCESS(devvp, accessmode, p->p_ucred, p);
		VOP_UNLOCK(devvp, 0, p);
		if (error)
			goto error_devvp;
	}

	if ((mp->mnt_flag & MNT_UPDATE) == 0)
		error = msdosfs_mountfs(devvp, mp, p, &args);
	else {
		if (devvp != pmp->pm_devvp)
			error = EINVAL;	/* XXX needs translation */
		else
			vrele(devvp);
	}
	if (error)
		goto error_devvp;

	pmp = VFSTOMSDOSFS(mp);
	pmp->pm_gid = args.gid;
	pmp->pm_uid = args.uid;
	pmp->pm_mask = args.mask;
	pmp->pm_flags |= args.flags & MSDOSFSMNT_MNTOPT;

	if (pmp->pm_flags & MSDOSFSMNT_NOWIN95)
		pmp->pm_flags |= MSDOSFSMNT_SHORTNAME;
	else if (!(pmp->pm_flags &
	    (MSDOSFSMNT_SHORTNAME | MSDOSFSMNT_LONGNAME))) {
		struct vnode *rvp;
		
		/*
		 * Try to divine whether to support Win'95 long filenames
		 */
		if (FAT32(pmp))
		        pmp->pm_flags |= MSDOSFSMNT_LONGNAME;
		else {
		        if ((error = msdosfs_root(mp, &rvp)) != 0) {
			        msdosfs_unmount(mp, MNT_FORCE, p);
			        goto error;
			}
			pmp->pm_flags |= findwin95(VTODE(rvp))
			     ? MSDOSFSMNT_LONGNAME
			     : MSDOSFSMNT_SHORTNAME;
			vput(rvp);
		}
	}
	(void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
	bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);

	size = strlcpy(mp->mnt_stat.f_mntfromname, fspec, MNAMELEN - 1);
	bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
	bcopy(&args, &mp->mnt_stat.mount_info.msdosfs_args, sizeof(args));
#ifdef MSDOSFS_DEBUG
	printf("msdosfs_mount(): mp %x, pmp %x, inusemap %x\n", mp,
	    pmp, pmp->pm_inusemap);
#endif
	return (0);

error_devvp:
	vrele(devvp);

error:
	if (fspec)
		free(fspec, M_MOUNT);

	return (error);
}
Exemplo n.º 29
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.
 */
static int
msdosfs_mount(struct mount *mp)
{
	struct vnode *devvp;	  /* vnode for blk device to mount */
	struct thread *td;
	/* msdosfs specific mount control block */
	struct msdosfsmount *pmp = NULL;
	struct nameidata ndp;
	int error, flags;
	accmode_t accmode;
	char *from;

	td = curthread;
	if (vfs_filteropt(mp->mnt_optnew, msdosfs_opts))
		return (EINVAL);

	/*
	 * 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);
		if (vfs_flagopt(mp->mnt_optnew, "export", NULL, 0)) {
			/*
			 * Forbid export requests if filesystem has
			 * MSDOSFS_LARGEFS flag set.
			 */
			if ((pmp->pm_flags & MSDOSFS_LARGEFS) != 0) {
				vfs_mount_error(mp,
				    "MSDOSFS_LARGEFS flag set, cannot export");
				return (EOPNOTSUPP);
			}
		}
		if (!(pmp->pm_flags & MSDOSFSMNT_RONLY) &&
		    vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0)) {
			error = VFS_SYNC(mp, MNT_WAIT);
			if (error)
				return (error);
			flags = WRITECLOSE;
			if (mp->mnt_flag & MNT_FORCE)
				flags |= FORCECLOSE;
			error = vflush(mp, 0, flags, td);
			if (error)
				return (error);

			/*
			 * Now the volume is clean.  Mark it so while the
			 * device is still rw.
			 */
			error = markvoldirty(pmp, 0);
			if (error) {
				(void)markvoldirty(pmp, 1);
				return (error);
			}

			/* Downgrade the device from rw to ro. */
			DROP_GIANT();
			g_topology_lock();
			error = g_access(pmp->pm_cp, 0, -1, 0);
			g_topology_unlock();
			PICKUP_GIANT();
			if (error) {
				(void)markvoldirty(pmp, 1);
				return (error);
			}

			/*
			 * Backing out after an error was painful in the
			 * above.  Now we are committed to succeeding.
			 */
			pmp->pm_fmod = 0;
			pmp->pm_flags |= MSDOSFSMNT_RONLY;
			MNT_ILOCK(mp);
			mp->mnt_flag |= MNT_RDONLY;
			MNT_IUNLOCK(mp);
		} else if ((pmp->pm_flags & MSDOSFSMNT_RONLY) &&
		    !vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0)) {
			/*
			 * If upgrade to read-write by non-root, then verify
			 * that user has necessary permissions on the device.
			 */
			devvp = pmp->pm_devvp;
			vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
			error = VOP_ACCESS(devvp, VREAD | VWRITE,
			    td->td_ucred, td);
			if (error)
				error = priv_check(td, PRIV_VFS_MOUNT_PERM);
			if (error) {
				VOP_UNLOCK(devvp, 0);
				return (error);
			}
			VOP_UNLOCK(devvp, 0);
			DROP_GIANT();
			g_topology_lock();
			error = g_access(pmp->pm_cp, 0, 1, 0);
			g_topology_unlock();
			PICKUP_GIANT();
			if (error)
				return (error);

			pmp->pm_fmod = 1;
			pmp->pm_flags &= ~MSDOSFSMNT_RONLY;
			MNT_ILOCK(mp);
			mp->mnt_flag &= ~MNT_RDONLY;
			MNT_IUNLOCK(mp);

			/* Now that the volume is modifiable, mark it dirty. */
			error = markvoldirty(pmp, 1);
			if (error)
				return (error); 
		}
	}
	/*
	 * Not an update, or updating the name: look up the name
	 * and verify that it refers to a sensible disk device.
	 */
	if (vfs_getopt(mp->mnt_optnew, "from", (void **)&from, NULL))
		return (EINVAL);
	NDINIT(&ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, from, td);
	error = namei(&ndp);
	if (error)
		return (error);
	devvp = ndp.ni_vp;
	NDFREE(&ndp, NDF_ONLY_PNBUF);

	if (!vn_isdisk(devvp, &error)) {
		vput(devvp);
		return (error);
	}
	/*
	 * If mount by non-root, then verify that user has necessary
	 * permissions on the device.
	 */
	accmode = VREAD;
	if ((mp->mnt_flag & MNT_RDONLY) == 0)
		accmode |= VWRITE;
	error = VOP_ACCESS(devvp, accmode, td->td_ucred, td);
	if (error)
		error = priv_check(td, PRIV_VFS_MOUNT_PERM);
	if (error) {
		vput(devvp);
		return (error);
	}
	if ((mp->mnt_flag & MNT_UPDATE) == 0) {
		error = mountmsdosfs(devvp, mp);
#ifdef MSDOSFS_DEBUG		/* only needed for the printf below */
		pmp = VFSTOMSDOSFS(mp);
#endif
	} else {
		vput(devvp);
		if (devvp != pmp->pm_devvp)
			return (EINVAL);	/* XXX needs translation */
	}
	if (error) {
		vrele(devvp);
		return (error);
	}

	error = update_mp(mp, td);
	if (error) {
		if ((mp->mnt_flag & MNT_UPDATE) == 0)
			msdosfs_unmount(mp, MNT_FORCE);
		return error;
	}

	if (devvp->v_type == VCHR && devvp->v_rdev != NULL)
		devvp->v_rdev->si_mountpt = mp;
	vfs_mountedfrom(mp, from);
#ifdef MSDOSFS_DEBUG
	printf("msdosfs_mount(): mp %p, pmp %p, inusemap %p\n", mp, pmp, pmp->pm_inusemap);
#endif
	return (0);
}