130 lines
5.2 KiB
C
130 lines
5.2 KiB
C
/*
|
|
* Copyright (c) 1994 The Regents of the University of California.
|
|
* Copyright (c) 1994 Jan-Simon Pendry.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software donated to Berkeley by
|
|
* Jan-Simon Pendry.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* @(#)union.h 8.9 (Berkeley) 12/10/94
|
|
* $Id: union.h,v 1.12 1998/02/26 03:23:51 kato Exp $
|
|
*/
|
|
|
|
struct union_args {
|
|
char *target; /* Target of loopback */
|
|
int mntflags; /* Options on the mount */
|
|
};
|
|
|
|
#define UNMNT_ABOVE 0x0001 /* Target appears below mount point */
|
|
#define UNMNT_BELOW 0x0002 /* Target appears below mount point */
|
|
#define UNMNT_REPLACE 0x0003 /* Target replaces mount point */
|
|
#define UNMNT_OPMASK 0x0003
|
|
|
|
struct union_mount {
|
|
struct vnode *um_uppervp;
|
|
struct vnode *um_lowervp;
|
|
struct ucred *um_cred; /* Credentials of user calling mount */
|
|
int um_cmode; /* cmask from mount process */
|
|
int um_op; /* Operation mode */
|
|
};
|
|
|
|
#ifdef KERNEL
|
|
|
|
/*
|
|
* DEFDIRMODE is the mode bits used to create a shadow directory.
|
|
*/
|
|
#define VRWXMODE (VREAD|VWRITE|VEXEC)
|
|
#define VRWMODE (VREAD|VWRITE)
|
|
#define UN_DIRMODE ((VRWXMODE)|(VRWXMODE>>3)|(VRWXMODE>>6))
|
|
#define UN_FILEMODE ((VRWMODE)|(VRWMODE>>3)|(VRWMODE>>6))
|
|
|
|
/*
|
|
* A cache of vnode references
|
|
*/
|
|
struct union_node {
|
|
LIST_ENTRY(union_node) un_cache; /* Hash chain */
|
|
struct vnode *un_vnode; /* Back pointer */
|
|
struct vnode *un_uppervp; /* overlaying object */
|
|
struct vnode *un_lowervp; /* underlying object */
|
|
struct vnode *un_dirvp; /* Parent dir of uppervp */
|
|
struct vnode *un_pvp; /* Parent vnode */
|
|
char *un_path; /* saved component name */
|
|
int un_hash; /* saved un_path hash value */
|
|
int un_openl; /* # of opens on lowervp */
|
|
unsigned int un_flags;
|
|
struct vnode **un_dircache; /* cached union stack */
|
|
off_t un_uppersz; /* size of upper object */
|
|
off_t un_lowersz; /* size of lower object */
|
|
#ifdef DIAGNOSTIC
|
|
pid_t un_pid;
|
|
#endif
|
|
};
|
|
|
|
#define UN_WANT 0x01
|
|
#define UN_LOCKED 0x02
|
|
#define UN_ULOCK 0x04 /* Upper node is locked */
|
|
#define UN_KLOCK 0x08 /* Keep upper node locked on vput */
|
|
#define UN_CACHED 0x10 /* In union cache */
|
|
|
|
extern int union_allocvp __P((struct vnode **, struct mount *,
|
|
struct vnode *, struct vnode *,
|
|
struct componentname *, struct vnode *,
|
|
struct vnode *, int));
|
|
extern int union_freevp __P((struct vnode *));
|
|
extern struct vnode *union_dircache __P((struct vnode *, struct proc *));
|
|
extern int union_copyup __P((struct union_node *, int, struct ucred *,
|
|
struct proc *));
|
|
extern int union_dowhiteout __P((struct union_node *, struct ucred *,
|
|
struct proc *));
|
|
extern int union_mkshadow __P((struct union_mount *, struct vnode *,
|
|
struct componentname *, struct vnode **));
|
|
extern int union_mkwhiteout __P((struct union_mount *, struct vnode *,
|
|
struct componentname *, char *));
|
|
extern int union_cn_close __P((struct vnode *, int, struct ucred *,
|
|
struct proc *));
|
|
extern void union_removed_upper __P((struct union_node *un));
|
|
extern struct vnode *union_lowervp __P((struct vnode *));
|
|
extern void union_newsize __P((struct vnode *, off_t, off_t));
|
|
|
|
extern int (*union_dircheckp) __P((struct proc *, struct vnode **,
|
|
struct file *));
|
|
|
|
#define MOUNTTOUNIONMOUNT(mp) ((struct union_mount *)((mp)->mnt_data))
|
|
#define VTOUNION(vp) ((struct union_node *)(vp)->v_data)
|
|
#define UNIONTOV(un) ((un)->un_vnode)
|
|
#define LOWERVP(vp) (VTOUNION(vp)->un_lowervp)
|
|
#define UPPERVP(vp) (VTOUNION(vp)->un_uppervp)
|
|
#define OTHERVP(vp) (UPPERVP(vp) ? UPPERVP(vp) : LOWERVP(vp))
|
|
|
|
extern vop_t **union_vnodeop_p;
|
|
extern struct vfsops union_vfsops;
|
|
#endif /* KERNEL */
|