d8c6e674a4
directory vnodes use to refer to their constituent vnodes, into union_dircache_free(). Also s/union_dircache/union_dircache_get/ and tweak the structure of union_dircache_r(). MFC after: 3 days
145 lines
5.3 KiB
C
145 lines
5.3 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
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#define UNMNT_ABOVE 0x0001 /* Target appears above mount point */
|
|
#define UNMNT_BELOW 0x0002 /* Target appears below mount point */
|
|
#define UNMNT_REPLACE 0x0003 /* Target replaces mount point */
|
|
|
|
struct union_mount {
|
|
struct vnode *um_uppervp; /* UN_ULOCK holds locking state */
|
|
struct vnode *um_lowervp; /* Left unlocked */
|
|
struct ucred *um_cred; /* Credentials of user calling mount */
|
|
int um_cmode; /* cmask from mount process */
|
|
int um_op; /* Operation mode */
|
|
};
|
|
|
|
#ifdef _KERNEL
|
|
|
|
#ifndef DIAGNOSTIC
|
|
#define DIAGNOSTIC
|
|
#endif
|
|
|
|
/*
|
|
* 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 (hangs off v_data)
|
|
*/
|
|
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_openl; /* # of opens on lowervp */
|
|
int un_exclcnt; /* exclusive count */
|
|
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
|
|
};
|
|
|
|
/*
|
|
* XXX UN_ULOCK - indicates that the uppervp is locked
|
|
*
|
|
* UN_CACHED - node is in the union cache
|
|
*/
|
|
|
|
/*#define UN_ULOCK 0x04*/ /* Upper node is locked */
|
|
#define UN_CACHED 0x10 /* In union cache */
|
|
|
|
/*
|
|
* Hash table locking flags
|
|
*/
|
|
|
|
#define UNVP_WANT 0x01
|
|
#define UNVP_LOCKED 0x02
|
|
|
|
extern int union_allocvp(struct vnode **, struct mount *,
|
|
struct vnode *,
|
|
struct vnode *,
|
|
struct componentname *, struct vnode *,
|
|
struct vnode *, int);
|
|
extern int union_freevp(struct vnode *);
|
|
extern struct vnode *union_dircache_get(struct vnode *, struct thread *);
|
|
extern void union_dircache_free(struct union_node *);
|
|
extern int union_copyup(struct union_node *, int, struct ucred *,
|
|
struct thread *);
|
|
extern int union_dowhiteout(struct union_node *, struct ucred *,
|
|
struct thread *);
|
|
extern int union_mkshadow(struct union_mount *, struct vnode *,
|
|
struct componentname *, struct vnode **);
|
|
extern int union_mkwhiteout(struct union_mount *, struct vnode *,
|
|
struct componentname *, char *);
|
|
extern int union_cn_close(struct vnode *, int, struct ucred *,
|
|
struct thread *);
|
|
extern void union_removed_upper(struct union_node *un);
|
|
extern struct vnode *union_lowervp(struct vnode *);
|
|
extern void union_newsize(struct vnode *, off_t, off_t);
|
|
|
|
extern int (*union_dircheckp)(struct thread *, 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))
|
|
|
|
#define UDEBUG(x) if (uniondebug) printf x
|
|
#define UDEBUG_ENABLED 1
|
|
|
|
extern vop_t **union_vnodeop_p;
|
|
extern struct vfsops union_vfsops;
|
|
extern int uniondebug;
|
|
|
|
#endif /* _KERNEL */
|