/*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright (c) 1994 The Regents of the University of California. * Copyright (c) 1994 Jan-Simon Pendry. * Copyright (c) 2005, 2006 Masanori Ozawa , ONGS Inc. * Copyright (c) 2006 Daichi Goto * 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. */ #ifdef _KERNEL /* copy method of attr from lower to upper */ typedef enum _unionfs_copymode { UNIONFS_TRADITIONAL = 0, UNIONFS_TRANSPARENT, UNIONFS_MASQUERADE } unionfs_copymode; /* whiteout policy of upper layer */ typedef enum _unionfs_whitemode { UNIONFS_WHITE_ALWAYS = 0, UNIONFS_WHITE_WHENNEEDED } unionfs_whitemode; struct unionfs_mount { struct mount *um_lowermp; /* MNT_REFed lower mount object */ struct mount *um_uppermp; /* MNT_REFed upper mount object */ struct vnode *um_lowervp; /* VREFed once */ struct vnode *um_uppervp; /* VREFed once */ struct vnode *um_rootvp; /* ROOT vnode */ struct mount_upper_node um_lower_link; /* node in lower FS list of uppers */ struct mount_upper_node um_upper_link; /* node in upper FS list of uppers */ unionfs_copymode um_copymode; unionfs_whitemode um_whitemode; uid_t um_uid; gid_t um_gid; u_short um_udir; u_short um_ufile; }; /* unionfs status list */ struct unionfs_node_status { LIST_ENTRY(unionfs_node_status) uns_list; /* Status list */ pid_t uns_pid; /* current process id */ int uns_node_flag; /* uns flag */ int uns_lower_opencnt; /* open count of lower */ int uns_upper_opencnt; /* open count of upper */ int uns_lower_openmode; /* open mode of lower */ int uns_readdir_status; /* read status of readdir */ }; /* union node status flags */ #define UNS_OPENL_4_READDIR 0x01 /* open lower layer for readdir */ /* A cache of vnode references */ struct unionfs_node { struct vnode *un_lowervp; /* lower side vnode */ struct vnode *un_uppervp; /* upper side vnode */ struct vnode *un_dvp; /* parent unionfs vnode */ struct vnode *un_vnode; /* Back pointer */ LIST_HEAD(, unionfs_node_status) un_unshead; /* unionfs status head */ LIST_HEAD(unionfs_node_hashhead, unionfs_node) *un_hashtbl; /* dir vnode hash table */ union { LIST_ENTRY(unionfs_node) un_hash; /* hash list entry */ STAILQ_ENTRY(unionfs_node) un_rele; /* deferred release list */ }; char *un_path; /* path */ int un_pathlen; /* strlen of path */ int un_flag; /* unionfs node flag */ }; /* * unionfs node flags * It needs the vnode with exclusive lock, when changing the un_flag variable. */ #define UNIONFS_OPENEXTL 0x01 /* openextattr (lower) */ #define UNIONFS_OPENEXTU 0x02 /* openextattr (upper) */ extern struct vop_vector unionfs_vnodeops; static inline struct unionfs_node * unionfs_check_vnode(struct vnode *vp, const char *file __unused, int line __unused) { /* * unionfs_lock() needs the NULL check here, as it explicitly * handles the case in which the vnode has been vgonel()'ed. */ KASSERT(vp->v_op == &unionfs_vnodeops || vp->v_data == NULL, ("%s:%d: non-unionfs vnode %p", file, line, vp)); return ((struct unionfs_node *)vp->v_data); } #define MOUNTTOUNIONFSMOUNT(mp) ((struct unionfs_mount *)((mp)->mnt_data)) #define VTOUNIONFS(vp) unionfs_check_vnode(vp, __FILE__, __LINE__) #define UNIONFSTOV(xp) ((xp)->un_vnode) int unionfs_init(struct vfsconf *); int unionfs_uninit(struct vfsconf *); int unionfs_nodeget(struct mount *, struct vnode *, struct vnode *, struct vnode *, struct vnode **, struct componentname *); void unionfs_noderem(struct vnode *); void unionfs_get_node_status(struct unionfs_node *, struct thread *, struct unionfs_node_status **); void unionfs_tryrem_node_status(struct unionfs_node *, struct unionfs_node_status *); int unionfs_check_rmdir(struct vnode *, struct ucred *, struct thread *td); int unionfs_copyfile(struct unionfs_node *, int, struct ucred *, struct thread *); void unionfs_create_uppervattr_core(struct unionfs_mount *, struct vattr *, struct vattr *, struct thread *); int unionfs_create_uppervattr(struct unionfs_mount *, struct vnode *, struct vattr *, struct ucred *, struct thread *); int unionfs_mkshadowdir(struct unionfs_mount *, struct vnode *, struct unionfs_node *, struct componentname *, struct thread *); int unionfs_mkwhiteout(struct vnode *, struct vnode *, struct componentname *, struct thread *, char *, int); int unionfs_relookup(struct vnode *, struct vnode **, struct componentname *, struct componentname *, struct thread *, char *, int, u_long); int unionfs_relookup_for_create(struct vnode *, struct componentname *, struct thread *); int unionfs_relookup_for_delete(struct vnode *, struct componentname *, struct thread *); int unionfs_relookup_for_rename(struct vnode *, struct componentname *, struct thread *); void unionfs_forward_vop_start_pair(struct vnode *, int *, struct vnode *, int *); bool unionfs_forward_vop_finish_pair(struct vnode *, struct vnode *, int, struct vnode *, struct vnode *, int); static inline void unionfs_forward_vop_start(struct vnode *basevp, int *lkflags) { unionfs_forward_vop_start_pair(basevp, lkflags, NULL, NULL); } static inline bool unionfs_forward_vop_finish(struct vnode *unionvp, struct vnode *basevp, int lkflags) { return (unionfs_forward_vop_finish_pair(unionvp, basevp, lkflags, NULL, NULL, 0)); } #define UNIONFSVPTOLOWERVP(vp) (VTOUNIONFS(vp)->un_lowervp) #define UNIONFSVPTOUPPERVP(vp) (VTOUNIONFS(vp)->un_uppervp) #ifdef MALLOC_DECLARE MALLOC_DECLARE(M_UNIONFSNODE); MALLOC_DECLARE(M_UNIONFSPATH); #endif #ifdef UNIONFS_DEBUG #define UNIONFSDEBUG(format, args...) printf(format ,## args) #else #define UNIONFSDEBUG(format, args...) #endif /* UNIONFS_DEBUG */ #endif /* _KERNEL */