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