lofs_node.h revision af4c679f647cf088543c762e33d41a3ac52cfa14
/*
* 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 */