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1e5da15a63
PR: 118346 Submitted by: Masanori OZAWA <ozawa@ongs.co.jp> Discussed at: devsummit Strassburg, EuroBSDCon2008 Discussed with: rwatson, gnn, hrs MFC after: 2 week
149 lines
6.4 KiB
C
149 lines
6.4 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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* Copyright (c) 2005, 2006 Masanori Ozawa <ozawa@ongs.co.jp>, ONGS Inc.
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* Copyright (c) 2006 Daichi Goto <daichi@freebsd.org>
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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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#ifdef _KERNEL
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/* copy method of attr from lower to upper */
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typedef enum _unionfs_copymode {
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UNIONFS_TRADITIONAL = 0,
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UNIONFS_TRANSPARENT,
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UNIONFS_MASQUERADE
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} unionfs_copymode;
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/* whiteout policy of upper layer */
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typedef enum _unionfs_whitemode {
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UNIONFS_WHITE_ALWAYS = 0,
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UNIONFS_WHITE_WHENNEEDED
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} unionfs_whitemode;
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struct unionfs_mount {
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struct vnode *um_lowervp; /* VREFed once */
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struct vnode *um_uppervp; /* VREFed once */
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struct vnode *um_rootvp; /* ROOT vnode */
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unionfs_copymode um_copymode;
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unionfs_whitemode um_whitemode;
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uid_t um_uid;
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gid_t um_gid;
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u_short um_udir;
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u_short um_ufile;
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};
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/* unionfs status list */
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struct unionfs_node_status {
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LIST_ENTRY(unionfs_node_status) uns_list; /* Status list */
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pid_t uns_pid; /* current process id */
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int uns_node_flag; /* uns flag */
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int uns_lower_opencnt; /* open count of lower */
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int uns_upper_opencnt; /* open count of upper */
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int uns_lower_openmode; /* open mode of lower */
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int uns_readdir_status; /* read status of readdir */
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};
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/* union node status flags */
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#define UNS_OPENL_4_READDIR 0x01 /* open lower layer for readdir */
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/* A cache of vnode references */
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struct unionfs_node {
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struct vnode *un_lowervp; /* lower side vnode */
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struct vnode *un_uppervp; /* upper side vnode */
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struct vnode *un_dvp; /* parent unionfs vnode */
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struct vnode *un_vnode; /* Back pointer */
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LIST_HEAD(, unionfs_node_status) un_unshead;
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/* unionfs status head */
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LIST_HEAD(unionfs_node_hashhead, unionfs_node) *un_hashtbl;
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/* dir vnode hash table */
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LIST_ENTRY(unionfs_node) un_hash; /* hash list entry */
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u_long un_hashmask; /* bit mask */
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char *un_path; /* path */
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int un_flag; /* unionfs node flag */
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};
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/*
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* unionfs node flags
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* It needs the vnode with exclusive lock, when changing the un_flag variable.
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*/
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#define UNIONFS_OPENEXTL 0x01 /* openextattr (lower) */
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#define UNIONFS_OPENEXTU 0x02 /* openextattr (upper) */
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#define MOUNTTOUNIONFSMOUNT(mp) ((struct unionfs_mount *)((mp)->mnt_data))
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#define VTOUNIONFS(vp) ((struct unionfs_node *)(vp)->v_data)
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#define UNIONFSTOV(xp) ((xp)->un_vnode)
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int unionfs_init(struct vfsconf *vfsp);
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int unionfs_uninit(struct vfsconf *vfsp);
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int unionfs_nodeget(struct mount *mp, struct vnode *uppervp, struct vnode *lowervp, struct vnode *dvp, struct vnode **vpp, struct componentname *cnp, struct thread *td);
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void unionfs_noderem(struct vnode *vp, struct thread *td);
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void unionfs_get_node_status(struct unionfs_node *unp, struct thread *td, struct unionfs_node_status **unspp);
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void unionfs_tryrem_node_status(struct unionfs_node *unp, struct unionfs_node_status *unsp);
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int unionfs_check_rmdir(struct vnode *vp, struct ucred *cred, struct thread *td);
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int unionfs_copyfile(struct unionfs_node *unp, int docopy, struct ucred *cred, struct thread *td);
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void unionfs_create_uppervattr_core(struct unionfs_mount *ump, struct vattr *lva, struct vattr *uva, struct thread *td);
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int unionfs_create_uppervattr(struct unionfs_mount *ump, struct vnode *lvp, struct vattr *uva, struct ucred *cred, struct thread *td);
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int unionfs_mkshadowdir(struct unionfs_mount *ump, struct vnode *duvp, struct unionfs_node *unp, struct componentname *cnp, struct thread *td);
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int unionfs_mkwhiteout(struct vnode *dvp, struct componentname *cnp, struct thread *td, char *path);
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int unionfs_relookup(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp, struct componentname *cn, struct thread *td, char *path, int pathlen, u_long nameiop);
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int unionfs_relookup_for_create(struct vnode *dvp, struct componentname *cnp, struct thread *td);
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int unionfs_relookup_for_delete(struct vnode *dvp, struct componentname *cnp, struct thread *td);
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int unionfs_relookup_for_rename(struct vnode *dvp, struct componentname *cnp, struct thread *td);
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#ifdef DIAGNOSTIC
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struct vnode *unionfs_checklowervp(struct vnode *vp, char *fil, int lno);
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struct vnode *unionfs_checkuppervp(struct vnode *vp, char *fil, int lno);
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#define UNIONFSVPTOLOWERVP(vp) unionfs_checklowervp((vp), __FILE__, __LINE__)
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#define UNIONFSVPTOUPPERVP(vp) unionfs_checkuppervp((vp), __FILE__, __LINE__)
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#else
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#define UNIONFSVPTOLOWERVP(vp) (VTOUNIONFS(vp)->un_lowervp)
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#define UNIONFSVPTOUPPERVP(vp) (VTOUNIONFS(vp)->un_uppervp)
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#endif
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extern struct vop_vector unionfs_vnodeops;
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#ifdef MALLOC_DECLARE
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MALLOC_DECLARE(M_UNIONFSNODE);
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MALLOC_DECLARE(M_UNIONFSPATH);
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#endif
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#ifdef UNIONFS_DEBUG
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#define UNIONFSDEBUG(format, args...) printf(format ,## args)
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#else
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#define UNIONFSDEBUG(format, args...)
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#endif /* UNIONFS_DEBUG */
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#endif /* _KERNEL */
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