Seperate the export check in VFS_FHTOVP, exports are now checked via

VFS_CHECKEXP.

Add fh(open|stat|stafs) syscalls to allow userland to query filesystems
based on (network) filehandle.

Obtained from:	NetBSD

2 files changed, 33 insertions, 18 deletions

diff --git a/sys/ufs/ufs/ufs_extern.h b/sys/ufs/ufs/ufs_extern.h
index ee2779d..feec939 100644
--- a/sys/ufs/ufs/ufs_extern.h
+++ b/sys/ufs/ufs/ufs_extern.h
@@ -61,9 +61,9 @@ int	ufs_vnoperatespec __P((struct vop_generic_args *));
 int	 ufs_bmap __P((struct vop_bmap_args *));
 int	 ufs_bmaparray __P((struct vnode *, daddr_t, daddr_t *, struct indir *,
 		int *, int *, int *));
-int	 ufs_check_export __P((struct mount *, struct ufid *, 
-			       struct sockaddr *, struct vnode **, 
-			       int *exflagsp, struct ucred **));
+int	 ufs_check_export __P((struct mount *, struct sockaddr *, 
+			       int *, struct ucred **));
+int	 ufs_fhtovp(register struct mount *, struct ufid *, struct vnode **);
 int	 ufs_checkpath __P((struct inode *, struct inode *, struct ucred *));
 void	 ufs_dirbad __P((struct inode *, doff_t, char *));
 int	 ufs_dirbadentry __P((struct vnode *, struct direct *, int));
diff --git a/sys/ufs/ufs/ufs_vfsops.c b/sys/ufs/ufs/ufs_vfsops.c
index f128400..22cc9cc 100644
--- a/sys/ufs/ufs/ufs_vfsops.c
+++ b/sys/ufs/ufs/ufs_vfsops.c
@@ -183,31 +183,18 @@ ufs_init(vfsp)
  * This is the generic part of fhtovp called after the underlying
  * filesystem has validated the file handle.
  *
- * Verify that a host should have access to a filesystem, and if so
- * return a vnode for the presented file handle.
+ * Call the VFS_CHECKEXP beforehand to verify access.
  */
 int
-ufs_check_export(mp, ufhp, nam, vpp, exflagsp, credanonp)
+ufs_fhtovp(mp, ufhp, vpp)
 	register struct mount *mp;
 	struct ufid *ufhp;
-	struct sockaddr *nam;
 	struct vnode **vpp;
-	int *exflagsp;
-	struct ucred **credanonp;
 {
 	register struct inode *ip;
-	register struct netcred *np;
-	register struct ufsmount *ump = VFSTOUFS(mp);
 	struct vnode *nvp;
 	int error;
 
-	/*
-	 * Get the export permission structure for this <mp, client> tuple.
-	 */
-	np = vfs_export_lookup(mp, &ump->um_export, nam);
-	if (np == NULL)
-		return (EACCES);
-
 	error = VFS_VGET(mp, ufhp->ufid_ino, &nvp);
 	if (error) {
 		*vpp = NULLVP;
@@ -220,6 +207,34 @@ ufs_check_export(mp, ufhp, nam, vpp, exflagsp, credanonp)
 		return (ESTALE);
 	}
 	*vpp = nvp;
+	return (0);
+}
+
+
+/*
+ * This is the generic part of fhtovp called after the underlying
+ * filesystem has validated the file handle.
+ *
+ * Verify that a host should have access to a filesystem.
+ */
+int
+ufs_check_export(mp, nam, exflagsp, credanonp)
+	register struct mount *mp;
+	struct sockaddr *nam;
+	int *exflagsp;
+	struct ucred **credanonp;
+{
+	register struct netcred *np;
+	register struct ufsmount *ump;;
+
+	ump = VFSTOUFS(mp);
+	/*
+	 * Get the export permission structure for this <mp, client> tuple.
+	 */
+	np = vfs_export_lookup(mp, &ump->um_export, nam);
+	if (np == NULL)
+		return (EACCES);
+
 	*exflagsp = np->netc_exflags;
 	*credanonp = &np->netc_anon;
 	return (0);