/* $NetBSD: union.h,v 1.10 2004/05/20 06:34:27 atatat 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 */ 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" struct union_mount { struct vnode *um_uppervp; struct vnode *um_lowervp; struct ucred *um_cred; /* Credentials of user calling mount */ int um_cmode; /* cmask from mount process */ int um_op; /* Operation mode */ }; #ifdef _KERNEL /* * 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 */ 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_hash; /* saved un_path hash value */ int un_openl; /* # of opens on lowervp */ 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 }; #define UN_WANTED 0x01 #define UN_LOCKED 0x02 #define UN_ULOCK 0x04 /* Upper node is locked */ #define UN_KLOCK 0x08 /* Keep upper node locked on vput */ #define UN_CACHED 0x10 /* In union cache */ #define UN_DRAINING 0x20 /* upper node lock is draining */ #define UN_DRAINED 0x40 /* upper node lock is drained */ extern int union_allocvp __P((struct vnode **, struct mount *, struct vnode *, struct vnode *, struct componentname *, struct vnode *, struct vnode *, int)); extern int union_copyfile __P((struct vnode *, struct vnode *, struct ucred *, struct proc *)); extern int union_copyup __P((struct union_node *, int, struct ucred *, struct proc *)); extern void union_diruncache __P((struct union_node *)); extern int union_dowhiteout __P((struct union_node *, struct ucred *, struct proc *)); extern int union_mkshadow __P((struct union_mount *, struct vnode *, struct componentname *, struct vnode **)); extern int union_mkwhiteout __P((struct union_mount *, struct vnode *, struct componentname *, char *)); extern int union_vn_create __P((struct vnode **, struct union_node *, struct proc *)); extern int union_cn_close __P((struct vnode *, int, struct ucred *, struct proc *)); extern void union_removed_upper __P((struct union_node *un)); extern struct vnode *union_lowervp __P((struct vnode *)); extern void union_newlower __P((struct union_node *, struct vnode *)); extern void union_newupper __P((struct union_node *, struct vnode *)); extern void union_newsize __P((struct vnode *, off_t, off_t)); int union_readdirhook(struct vnode **, struct file *, struct proc *); #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)) extern int (**union_vnodeop_p) __P((void *)); void union_init __P((void)); void union_done __P((void)); int union_freevp __P((struct vnode *)); #ifdef SYSCTL_SETUP_PROTO SYSCTL_SETUP_PROTO(sysctl_vfs_union_setup); #endif /* SYSCTL_SETUP_PROTO */ #endif /* _KERNEL */