/*
 * Copyright 2006 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

#pragma ident	"@(#)lofs_node.h	1.12	06/03/22 SMI"

#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 *);

extern struct vnode kvp;
#endif /* _KERNEL */

#ifdef	__cplusplus
}
#endif

#endif	/* _SYS_FS_LOFS_NODE_H */
