f36cfd49ad
license, per letter dated July 22, 1999 and email from Peter Wemm, Alan Cox and Robert Watson. Approved by: core, peter, alc, rwatson
141 lines
5.0 KiB
C
141 lines
5.0 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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* 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 8.9 (Berkeley) 12/10/94
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* $FreeBSD$
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*/
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#define UNMNT_ABOVE 0x0001 /* Target appears above 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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struct union_mount {
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struct vnode *um_uppervp; /* UN_ULOCK holds locking state */
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struct vnode *um_lowervp; /* Left unlocked */
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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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#ifndef DIAGNOSTIC
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#define DIAGNOSTIC
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#endif
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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 (hangs off v_data)
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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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struct vnode *un_pvp; /* Parent vnode */
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char *un_path; /* saved component name */
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int un_openl; /* # of opens on lowervp */
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int un_exclcnt; /* exclusive count */
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unsigned int un_flags;
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struct vnode **un_dircache; /* cached union stack */
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off_t un_uppersz; /* size of upper object */
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off_t un_lowersz; /* size of lower object */
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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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/*
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* XXX UN_ULOCK - indicates that the uppervp is locked
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*
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* UN_CACHED - node is in the union cache
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*/
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/*#define UN_ULOCK 0x04*/ /* Upper node is locked */
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#define UN_CACHED 0x10 /* In union cache */
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/*
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* Hash table locking flags
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*/
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#define UNVP_WANT 0x01
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#define UNVP_LOCKED 0x02
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extern int union_allocvp(struct vnode **, struct mount *,
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struct vnode *,
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struct vnode *,
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struct componentname *, struct vnode *,
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struct vnode *, int);
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extern int union_freevp(struct vnode *);
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extern struct vnode *union_dircache_get(struct vnode *, struct thread *);
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extern void union_dircache_free(struct union_node *);
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extern int union_copyup(struct union_node *, int, struct ucred *,
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struct thread *);
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extern int union_dowhiteout(struct union_node *, struct ucred *,
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struct thread *);
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extern int union_mkshadow(struct union_mount *, struct vnode *,
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struct componentname *, struct vnode **);
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extern int union_mkwhiteout(struct union_mount *, struct vnode *,
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struct componentname *, char *);
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extern int union_cn_close(struct vnode *, int, struct ucred *,
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struct thread *);
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extern void union_removed_upper(struct union_node *un);
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extern struct vnode *union_lowervp(struct vnode *);
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extern void union_newsize(struct vnode *, off_t, off_t);
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extern int (*union_dircheckp)(struct thread *, struct vnode **,
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struct file *);
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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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#define UDEBUG(x) if (uniondebug) printf x
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#define UDEBUG_ENABLED 1
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extern vop_t **union_vnodeop_p;
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extern struct vfsops union_vfsops;
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extern int uniondebug;
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#endif /* _KERNEL */
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