1 /*- 2 * Copyright (c) 1994 The Regents of the University of California. 3 * Copyright (c) 1994 Jan-Simon Pendry. 4 * Copyright (c) 2005, 2006 Masanori Ozawa <ozawa (at) ongs.co.jp>, ONGS Inc. 5 * Copyright (c) 2006 Daichi Goto <daichi (at) freebsd.org> 6 * All rights reserved. 7 * 8 * This code is derived from software donated to Berkeley by 9 * Jan-Simon Pendry. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)union.h 8.9 (Berkeley) 12/10/94 36 * $FreeBSD: src/sys/fs/unionfs/union.h,v 1.36 2007/10/14 13:55:38 daichi Exp $ 37 */ 38 39 #ifndef _MISCFS_UNION_H_ 40 #define _MISCFS_UNION_H_ 41 42 #define UNIONFS_DEBUG 43 44 struct union_args { 45 char *target; /* Target of loopback */ 46 int mntflags; /* Options on the mount */ 47 }; 48 #define unionfs_args union_args 49 50 #define UNMNT_ABOVE 0x0001 /* Target appears below mount point */ 51 #define UNMNT_BELOW 0x0002 /* Target appears below mount point */ 52 #define UNMNT_REPLACE 0x0003 /* Target replaces mount point */ 53 #define UNMNT_OPMASK 0x0003 54 55 #define UNMNT_BITS "\177\20" \ 56 "b\00above\0b\01below\0b\02replace\0" 57 58 #ifdef _KERNEL 59 60 /* copy method of attr from lower to upper */ 61 typedef enum _unionfs_copymode { 62 UNIONFS_TRADITIONAL = 0, 63 UNIONFS_TRANSPARENT, 64 UNIONFS_MASQUERADE 65 } unionfs_copymode; 66 67 /* whiteout policy of upper layer */ 68 typedef enum _unionfs_whitemode { 69 UNIONFS_WHITE_ALWAYS = 0, 70 UNIONFS_WHITE_WHENNEEDED 71 } unionfs_whitemode; 72 73 struct unionfs_mount { 74 struct vnode *um_lowervp; /* VREFed once */ 75 struct vnode *um_uppervp; /* VREFed once */ 76 struct vnode *um_rootvp; /* ROOT vnode */ 77 kmutex_t um_lock; 78 unionfs_copymode um_copymode; 79 unionfs_whitemode um_whitemode; 80 uid_t um_uid; 81 gid_t um_gid; 82 int um_op; /* Operation mode */ 83 u_short um_udir; 84 u_short um_ufile; 85 }; 86 87 /* unionfs status list */ 88 struct unionfs_node_status { 89 LIST_ENTRY(unionfs_node_status) uns_list; /* Status list */ 90 pid_t uns_pid; /* current process id */ 91 lwpid_t uns_lid; /* current thread id */ 92 int uns_node_flag; /* uns flag */ 93 int uns_lower_opencnt; /* open count of lower */ 94 int uns_upper_opencnt; /* open count of upper */ 95 int uns_lower_openmode; /* open mode of lower */ 96 int uns_readdir_status; /* read status of readdir */ 97 }; 98 99 /* union node status flags */ 100 #define UNS_OPENL_4_READDIR 0x01 /* open lower layer for readdir */ 101 102 /* A cache of vnode references */ 103 struct unionfs_node { 104 struct vnode *un_lowervp; /* lower side vnode */ 105 struct vnode *un_uppervp; /* upper side vnode */ 106 struct vnode *un_dvp; /* parent unionfs vnode */ 107 struct vnode *un_vnode; /* Back pointer */ 108 LIST_HEAD(, unionfs_node_status) un_unshead; /* unionfs status head */ 109 char *un_path; /* path */ 110 int un_flag; /* unionfs node flag */ 111 }; 112 113 /* 114 * unionfs node flags 115 * It needs the vnode with exclusive lock, when changing the un_flag variable. 116 */ 117 #define UNIONFS_OPENEXTL 0x01 /* openextattr (lower) */ 118 #define UNIONFS_OPENEXTU 0x02 /* openextattr (upper) */ 119 120 #define MOUNTTOUNIONFSMOUNT(mp) ((struct unionfs_mount *)((mp)->mnt_data)) 121 #define VTOUNIONFS(vp) ((struct unionfs_node *)(vp)->v_data) 122 #define UNIONFSTOV(xp) ((xp)->un_vnode) 123 124 int unionfs_nodeget(struct mount *mp, struct vnode *uppervp, struct vnode *lowervp, struct vnode *dvp, struct vnode **vpp, struct componentname *cnp); 125 void unionfs_noderem(struct vnode *vp); 126 void unionfs_get_node_status(struct unionfs_node *unp, struct unionfs_node_status **unspp); 127 void unionfs_tryrem_node_status(struct unionfs_node *unp, struct unionfs_node_status *unsp); 128 129 int unionfs_check_rmdir(struct vnode *vp, kauth_cred_t cred); 130 int unionfs_copyfile(struct unionfs_node *unp, int docopy, kauth_cred_t cred); 131 void unionfs_create_uppervattr_core(struct unionfs_mount *ump, struct vattr *lva, struct vattr *uva); 132 int unionfs_create_uppervattr(struct unionfs_mount *ump, struct vnode *lvp, struct vattr *uva, kauth_cred_t cred); 133 int unionfs_mkshadowdir(struct unionfs_mount *ump, struct vnode *duvp, struct unionfs_node *unp, struct componentname *cnp); 134 int unionfs_mkwhiteout(struct vnode *dvp, struct componentname *cnp, const char *path); 135 int unionfs_relookup_for_create(struct vnode *dvp, struct componentname *cnp); 136 int unionfs_relookup_for_delete(struct vnode *dvp, struct componentname *cnp); 137 int unionfs_relookup_for_rename(struct vnode *dvp, struct componentname *cnp); 138 139 #ifdef DIAGNOSTIC 140 struct vnode *unionfs_checklowervp(struct vnode *vp, const char *fil, int lno); 141 struct vnode *unionfs_checkuppervp(struct vnode *vp, const char *fil, int lno); 142 #define UNIONFSVPTOLOWERVP(vp) unionfs_checklowervp((vp), __FILE__, __LINE__) 143 #define UNIONFSVPTOUPPERVP(vp) unionfs_checkuppervp((vp), __FILE__, __LINE__) 144 #else 145 #define UNIONFSVPTOLOWERVP(vp) (VTOUNIONFS(vp)->un_lowervp) 146 #define UNIONFSVPTOUPPERVP(vp) (VTOUNIONFS(vp)->un_uppervp) 147 #endif 148 149 extern int (**unionfs_vnodeop_p)(void *); 150 151 #ifdef MALLOC_DECLARE 152 MALLOC_DECLARE(M_UNIONFSPATH); 153 #endif 154 155 #ifdef UNIONFS_DEBUG 156 #define UNIONFSDEBUG(format, args...) printf(format ,## args) 157 #else 158 #define UNIONFSDEBUG(format, args...) 159 #endif /* UNIONFS_DEBUG */ 160 161 #endif /* _KERNEL */ 162 #endif /* _MISCFS_UNION_H_ */ 163
Indexes created Sun Sep 21 15:09:59 GMT 2025