118 lines
4.6 KiB
C
118 lines
4.6 KiB
C
/*
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* Copyright (c) 1994 The Regents of the University of California.
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* Copyright (c) 1994 Jan-Simon Pendry.
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* All rights reserved.
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*
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* This code is derived from software donated to Berkeley by
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* Jan-Simon Pendry.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)union.h 8.2 (Berkeley) 2/17/94
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*/
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struct union_args {
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char *target; /* Target of loopback */
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int mntflags; /* Options on the mount */
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};
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#define UNMNT_ABOVE 0x0001 /* Target appears below mount point */
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#define UNMNT_BELOW 0x0002 /* Target appears below mount point */
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#define UNMNT_REPLACE 0x0003 /* Target replaces mount point */
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#define UNMNT_OPMASK 0x0003
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struct union_mount {
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struct vnode *um_uppervp;
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struct vnode *um_lowervp;
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struct ucred *um_cred; /* Credentials of user calling mount */
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int um_cmode; /* cmask from mount process */
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int um_op; /* Operation mode */
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};
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#ifdef KERNEL
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/*
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* DEFDIRMODE is the mode bits used to create a shadow directory.
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*/
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#define VRWXMODE (VREAD|VWRITE|VEXEC)
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#define VRWMODE (VREAD|VWRITE)
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#define UN_DIRMODE ((VRWXMODE)|(VRWXMODE>>3)|(VRWXMODE>>6))
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#define UN_FILEMODE ((VRWMODE)|(VRWMODE>>3)|(VRWMODE>>6))
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/*
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* A cache of vnode references
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*/
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struct union_node {
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LIST_ENTRY(union_node) un_cache; /* Hash chain */
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struct vnode *un_vnode; /* Back pointer */
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struct vnode *un_uppervp; /* overlaying object */
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struct vnode *un_lowervp; /* underlying object */
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struct vnode *un_dirvp; /* Parent dir of uppervp */
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char *un_path; /* saved component name */
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int un_hash; /* saved un_path hash value */
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int un_openl; /* # of opens on lowervp */
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int un_flags;
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#ifdef DIAGNOSTIC
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pid_t un_pid;
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#endif
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};
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#define UN_WANT 0x01
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#define UN_LOCKED 0x02
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#define UN_ULOCK 0x04 /* Upper node is locked */
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#define UN_KLOCK 0x08 /* Keep upper node locked on vput */
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extern int union_allocvp __P((struct vnode **, struct mount *,
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struct vnode *, struct vnode *,
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struct componentname *, struct vnode *,
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struct vnode *));
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extern int union_copyfile __P((struct proc *, struct ucred *,
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struct vnode *, struct vnode *));
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extern int union_mkshadow __P((struct union_mount *, struct vnode *,
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struct componentname *, struct vnode **));
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extern int union_vn_create __P((struct vnode **, struct union_node *,
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struct proc *));
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extern int union_cn_close __P((struct vnode *, int, struct ucred *,
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struct proc *));
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extern void union_removed_upper __P((struct union_node *un));
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extern struct vnode *union_lowervp __P((struct vnode *));
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extern void union_newlower __P((struct union_node *, struct vnode *));
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extern void union_newupper __P((struct union_node *, struct vnode *));
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#define MOUNTTOUNIONMOUNT(mp) ((struct union_mount *)((mp)->mnt_data))
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#define VTOUNION(vp) ((struct union_node *)(vp)->v_data)
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#define UNIONTOV(un) ((un)->un_vnode)
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#define LOWERVP(vp) (VTOUNION(vp)->un_lowervp)
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#define UPPERVP(vp) (VTOUNION(vp)->un_uppervp)
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#define OTHERVP(vp) (UPPERVP(vp) ? UPPERVP(vp) : LOWERVP(vp))
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extern int (**union_vnodeop_p)();
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extern struct vfsops union_vfsops;
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#endif /* KERNEL */
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