#ifndef __UNION_UNION_H__
#define __UNION_UNION_H__
-#include <sys/appleapiopts.h>
-#include <sys/cdefs.h>
-
-#ifdef __APPLE_API_PRIVATE
-struct union_args {
- char *target; /* Target of loopback */
- int mntflags; /* Options on the mount */
-};
-
-#define UNMNT_ABOVE 0x0001 /* Target appears above mount point */
-#define UNMNT_BELOW 0x0002 /* Target appears below mount point */
-#define UNMNT_REPLACE 0x0003 /* Target replaces mount point */
-#ifdef FAULTFS
-#define UNMNT_FAULTIN 0x0004 /* get the files to TOT on lookup */
-#define UNMNT_OPMASK 0x0007
-#else
-#define UNMNT_OPMASK 0x0003
-#endif
-
-#ifdef BSD_KERNEL_PRIVATE
-
-struct union_mount {
- struct vnode *um_uppervp; /* */
- int um_uppervid; /* vid of upper vnode */
- struct vnode *um_lowervp; /* Left unlocked */
- int um_lowervid; /* vid of lower vnode */
- kauth_cred_t um_cred; /* Credentials of user calling mount */
- int um_cmode; /* cmask from mount process */
- int um_op; /* Operation mode */
- dev_t um_upperdev; /* Upper root node fsid[0]*/
-};
-
-
-#define UNION_ABOVE(x) (x->um_op == UNMNT_ABOVE)
-#define UNION_LOWER(x) (x->um_op == UNMNT_BELOW)
-#define UNION_REPLACE(x) (x->um_op == UNMNT_REPLACE)
-#ifdef FAULTFS
-#define UNION_FAULTIN(x) (x->um_op == UNMNT_FAULTIN)
-#else
-#define UNION_FAULTIN(x) (0)
-
-#endif
-
-/* LP64 version of union_args. all pointers
- * grow when we're dealing with a 64-bit process.
- * WARNING - keep in sync with union_args
- */
-
-struct user_union_args {
- user_addr_t target; /* Target of loopback */
- int mntflags; /* Options on the mount */
- char _pad[4];
-};
-
-/*
- * DEFDIRMODE is the mode bits used to create a shadow directory.
- */
-#define VRWXMODE (VREAD|VWRITE|VEXEC)
-#define VRWMODE (VREAD|VWRITE)
-#define UN_DIRMODE ((VRWXMODE)|(VRWXMODE>>3)|(VRWXMODE>>6))
-#define UN_FILEMODE ((VRWMODE)|(VRWMODE>>3)|(VRWMODE>>6))
-
-/*
- * 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 */
- int un_uppervid; /* vid of upper vnode */
- off_t un_uppersz; /* size of upper object */
-
- struct vnode *un_lowervp; /* underlying object */
- int un_lowervid; /* vid of upper vnode */
- off_t un_lowersz; /* size of lower 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 */
- int un_exclcnt; /* exclusive count */
- unsigned int un_flags;
- mount_t un_mount;
- struct vnode **un_dircache; /* cached union stack */
-};
-
-#define UN_WANT 0x01 /* union node is needed */
-#define UN_LOCKED 0x02 /* union node is locked */
-#define UN_CACHED 0x04 /* In union cache */
-#define UN_TRANSIT 0x08 /* The union node is in creation */
-#define UN_DELETED 0x10 /* The union node is deleted */
-#ifdef FAULTFS
-#define UN_FAULTFS 0x80 /* The union node is for faultfs */
-#endif
-#define UN_DIRENVN 0x100 /* The union node is created for dir enumeration */
-
-
-#ifdef FAULTFS
-#define UNNODE_FAULTIN(x) ((x->un_flags & UN_FAULTFS)== UN_FAULTFS)
-#else
-#define UNNODE_FAULTIN(x) (0)
-#endif
-/*
- * Hash table locking flags
- */
-
-#define UNVP_WANT 0x01
-#define UNVP_LOCKED 0x02
-
-#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_allocvp(struct vnode **, struct mount *,
- struct vnode *, struct vnode *,
- struct componentname *, struct vnode *,
- struct vnode *, int);
-extern int union_freevp(struct vnode *);
-extern struct vnode * union_dircache(struct vnode *, vfs_context_t);
-extern int union_copyfile(struct vnode *, struct vnode *,vfs_context_t );
-extern int union_copyup(struct union_node *, int, vfs_context_t );
-extern int union_dowhiteout(struct union_node *, vfs_context_t);
-extern int union_mkshadow(struct union_mount *, struct vnode *,
- struct componentname *, struct vnode **);
-extern int union_mkwhiteout(struct union_mount *, struct vnode *,
- struct componentname *, char *);
-extern int union_vn_create(struct vnode **, struct union_node *, mode_t mode, vfs_context_t context);
-extern int union_cn_close(struct vnode *, int, vfs_context_t context);
-extern void union_removed_upper(struct union_node *un);
-extern struct vnode *union_lowervp(struct vnode *);
-extern void union_newsize(struct vnode *, off_t, off_t);
-extern int union_init(struct vfsconf *);
-extern void union_updatevp(struct union_node *, struct vnode *, struct vnode *);
-extern void union_dircache_free(struct union_node *);
-extern int (*union_dircheckp)(struct vnode **, struct fileproc *, vfs_context_t);
-extern int union_faultin_copyup(struct vnode ** uvpp, vnode_t udvp, vnode_t lvp, struct componentname * cnp, vfs_context_t context);
-extern int (**union_vnodeop_p)(void *);
-extern struct vfsops union_vfsops;
-void union_lock(void);
-void union_unlock(void);
-
-#endif /* BSD_KERNEL_PRIVATE */
-
-#endif /* __APPLE_API_PRIVATE */
#endif /* __UNION_UNION_H__ */
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