185 lines
7.4 KiB
C
185 lines
7.4 KiB
C
/* $NetBSD: union.h,v 1.28 2015/02/16 10:22:00 hannken Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1994 The Regents of the University of California.
|
|
* 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. 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
|
|
*/
|
|
|
|
/*
|
|
* 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
|
|
*/
|
|
|
|
#ifndef _MISCFS_UNION_H_
|
|
#define _MISCFS_UNION_H_
|
|
|
|
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
|
|
|
|
#define UNMNT_BITS "\177\20" \
|
|
"b\00above\0b\01below\0b\02replace\0"
|
|
|
|
#ifdef _KERNEL
|
|
|
|
struct union_mount {
|
|
struct vnode *um_uppervp;
|
|
struct vnode *um_lowervp;
|
|
kauth_cred_t um_cred; /* Credentials of user calling mount */
|
|
int um_cmode; /* cmask from mount process */
|
|
int um_op; /* Operation mode */
|
|
};
|
|
|
|
/*
|
|
* DEFDIRMODE is the mode bits used to create a shadow directory.
|
|
*/
|
|
#define UN_DIRMODE (S_IRWXU|S_IRWXG|S_IRWXO)
|
|
#define UN_FILEMODE (S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH)
|
|
|
|
/*
|
|
* A cache of vnode references.
|
|
* Lock requirements are:
|
|
*
|
|
* : stable
|
|
* c unheadlock[hash]
|
|
* l un_lock
|
|
* m un_lock or vnode lock to read, un_lock and
|
|
* exclusive vnode lock to write
|
|
* v vnode lock to read, exclusive vnode lock to write
|
|
*
|
|
* Lock order is vnode then un_lock.
|
|
*/
|
|
struct union_node {
|
|
kmutex_t un_lock;
|
|
LIST_ENTRY(union_node) un_cache; /* c: Hash chain */
|
|
int un_refs; /* c: Reference counter */
|
|
struct mount *un_mount; /* c: union mount */
|
|
struct vnode *un_vnode; /* :: Back pointer */
|
|
struct vnode *un_uppervp; /* m: overlaying object */
|
|
struct vnode *un_lowervp; /* v: underlying object */
|
|
struct vnode *un_dirvp; /* v: Parent dir of uppervp */
|
|
struct vnode *un_pvp; /* v: Parent vnode */
|
|
char *un_path; /* v: saved component name */
|
|
int un_openl; /* v: # of opens on lowervp */
|
|
unsigned int un_cflags; /* c: cache flags */
|
|
struct vnode **un_dircache; /* v: cached union stack */
|
|
off_t un_uppersz; /* l: size of upper object */
|
|
off_t un_lowersz; /* l: size of lower object */
|
|
};
|
|
|
|
#define UN_CACHED 0x10 /* In union cache */
|
|
|
|
extern int union_allocvp(struct vnode **, struct mount *,
|
|
struct vnode *, struct vnode *,
|
|
struct componentname *, struct vnode *,
|
|
struct vnode *, int);
|
|
extern int union_check_rmdir(struct union_node *, kauth_cred_t);
|
|
extern int union_copyfile(struct vnode *, struct vnode *, kauth_cred_t,
|
|
struct lwp *);
|
|
extern int union_copyup(struct union_node *, int, kauth_cred_t,
|
|
struct lwp *);
|
|
extern void union_diruncache(struct union_node *);
|
|
extern int union_dowhiteout(struct union_node *, kauth_cred_t);
|
|
extern int union_mkshadow(struct union_mount *, struct vnode *,
|
|
struct componentname *, struct vnode **);
|
|
extern int union_mkwhiteout(struct union_mount *, struct vnode *,
|
|
struct componentname *, struct union_node *);
|
|
extern int union_vn_create(struct vnode **, struct union_node *,
|
|
struct lwp *);
|
|
extern int union_cn_close(struct vnode *, int, kauth_cred_t,
|
|
struct lwp *);
|
|
extern void union_removed_upper(struct union_node *un);
|
|
extern struct vnode *union_lowervp(struct vnode *);
|
|
extern void union_newlower(struct union_node *, struct vnode *);
|
|
extern void union_newupper(struct union_node *, struct vnode *);
|
|
extern void union_newsize(struct vnode *, off_t, off_t);
|
|
int union_readdirhook(struct vnode **, struct file *, struct lwp *);
|
|
|
|
VFS_PROTOS(union);
|
|
|
|
#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))
|
|
#define LOCKVP(vp) (UPPERVP(vp) ? UPPERVP(vp) : (vp))
|
|
|
|
extern int (**union_vnodeop_p)(void *);
|
|
|
|
void union_init(void);
|
|
void union_reinit(void);
|
|
void union_done(void);
|
|
int union_freevp(struct vnode *);
|
|
|
|
#endif /* _KERNEL */
|
|
#endif /* _MISCFS_UNION_H_ */
|