183 lines
7.4 KiB
C
183 lines
7.4 KiB
C
/* $NetBSD: union.h,v 1.24 2012/11/05 17:24:11 dholland Exp $ */
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/*
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* Copyright (c) 1994 The Regents of the University of California.
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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. 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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*/
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/*
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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 8.9 (Berkeley) 12/10/94
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*/
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#ifndef _MISCFS_UNION_H_
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#define _MISCFS_UNION_H_
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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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#define UNMNT_BITS "\177\20" \
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"b\00above\0b\01below\0b\02replace\0"
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#ifdef _KERNEL
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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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kauth_cred_t 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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/*
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* DEFDIRMODE is the mode bits used to create a shadow directory.
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*/
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#define UN_DIRMODE (S_IRWXU|S_IRWXG|S_IRWXO)
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#define UN_FILEMODE (S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH)
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/*
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* A cache of vnode references.
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* Lock requirements are:
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*
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* : stable
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* c unheadlock[hash]
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* l un_lock
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* m un_lock or vnode lock to read, un_lock and
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* exclusive vnode lock to write
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* v vnode lock to read, exclusive vnode lock to write
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*
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* Lock order is vnode then un_lock.
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*/
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struct union_node {
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kmutex_t un_lock;
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LIST_ENTRY(union_node) un_cache; /* c: Hash chain */
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struct vnode *un_vnode; /* :: Back pointer */
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struct vnode *un_uppervp; /* m: overlaying object */
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struct vnode *un_lowervp; /* v: underlying object */
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struct vnode *un_dirvp; /* v: Parent dir of uppervp */
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struct vnode *un_pvp; /* v: Parent vnode */
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char *un_path; /* v: saved component name */
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int un_openl; /* v: # of opens on lowervp */
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unsigned int un_flags; /* v: node flags */
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unsigned int un_cflags; /* c: cache flags */
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struct vnode **un_dircache; /* v: cached union stack */
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off_t un_uppersz; /* l: size of upper object */
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off_t un_lowersz; /* l: size of lower object */
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};
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#define UN_KLOCK 0x08 /* Keep upper node locked on vput */
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#define UN_CACHED 0x10 /* In union cache */
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extern int union_allocvp(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 *, int);
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extern int union_check_rmdir(struct union_node *, kauth_cred_t);
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extern int union_copyfile(struct vnode *, struct vnode *, kauth_cred_t,
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struct lwp *);
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extern int union_copyup(struct union_node *, int, kauth_cred_t,
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struct lwp *);
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extern void union_diruncache(struct union_node *);
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extern int union_dowhiteout(struct union_node *, kauth_cred_t);
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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 *, struct union_node *);
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extern int union_vn_create(struct vnode **, struct union_node *,
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struct lwp *);
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extern int union_cn_close(struct vnode *, int, kauth_cred_t,
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struct lwp *);
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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_newlower(struct union_node *, struct vnode *);
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extern void union_newupper(struct union_node *, struct vnode *);
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extern void union_newsize(struct vnode *, off_t, off_t);
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int union_readdirhook(struct vnode **, struct file *, struct lwp *);
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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 LOCKVP(vp) (UPPERVP(vp) ? UPPERVP(vp) : (vp))
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extern int (**union_vnodeop_p)(void *);
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void union_init(void);
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void union_reinit(void);
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void union_done(void);
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int union_freevp(struct vnode *);
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#endif /* _KERNEL */
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#endif /* _MISCFS_UNION_H_ */
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