/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*
 * Loop-back file information structure.
 */

#ifndef _SYS_FS_LOFS_NODE_H
#define _SYS_FS_LOFS_NODE_H

#include <sys/fs/lofs_info.h>

#ifdef  __cplusplus
extern "C" {
#endif

/*
 * The lnode is the "inode" for loop-back files.  It contains
 * all the information necessary to handle loop-back file on the
 * client side.
 */
typedef struct lnode {
        struct lnode    *lo_next;       /* link for hash chain */
        struct vnode    *lo_vp;         /* pointer to real vnode */
        uint_t          lo_looping;     /* looping flags (see below) */
        struct vnode    *lo_vnode;      /* place holder vnode for file */
} lnode_t;

/*
 * Flags used when looping has been detected.
 */
#define LO_LOOPING      0x01    /* Looping detected */
#define LO_AUTOLOOP     0x02    /* Autonode looping detected */

/*
 * Flag passed to makelonode().
 */
#define LOF_FORCE       0x1     /* Force creation of new lnode */

/*
 * Convert between vnode and lnode
 */
#define ltov(lp)        (((lp)->lo_vnode))
#define vtol(vp)        ((struct lnode *)((vp)->v_data))
#define realvp(vp)      (vtol(vp)->lo_vp)

#ifdef _KERNEL
extern vnode_t *makelonode(vnode_t *, struct loinfo *, int);
extern void freelonode(lnode_t *);
#endif /* _KERNEL */

#ifdef  __cplusplus
}
#endif

#endif  /* _SYS_FS_LOFS_NODE_H */