X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/de355530ae67247cbd0da700edb3a2a1dae884c2..4a3eedf9ecc9bbe3f3a5c6ce5e53ad199d639d32:/bsd/miscfs/union/union.h diff --git a/bsd/miscfs/union/union.h b/bsd/miscfs/union/union.h index 147df4c7f..5411f538d 100644 --- a/bsd/miscfs/union/union.h +++ b/bsd/miscfs/union/union.h @@ -1,23 +1,29 @@ /* - * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved. + * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved. * - * @APPLE_LICENSE_HEADER_START@ + * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * - * The contents of this file constitute Original Code as defined in and - * are subject to the Apple Public Source License Version 1.1 (the - * "License"). You may not use this file except in compliance with the - * License. Please obtain a copy of the License at - * http://www.apple.com/publicsource and read it before using this file. + * This file contains Original Code and/or Modifications of Original Code + * as defined in and that are subject to the Apple Public Source License + * Version 2.0 (the 'License'). You may not use this file except in + * compliance with the License. The rights granted to you under the License + * may not be used to create, or enable the creation or redistribution of, + * unlawful or unlicensed copies of an Apple operating system, or to + * circumvent, violate, or enable the circumvention or violation of, any + * terms of an Apple operating system software license agreement. * - * This Original Code and all software distributed under the License are - * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER + * Please obtain a copy of the License at + * http://www.opensource.apple.com/apsl/ and read it before using this file. + * + * The Original Code and all software distributed under the License are + * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the - * License for the specific language governing rights and limitations - * under the License. + * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. + * Please see the License for the specific language governing rights and + * limitations under the License. * - * @APPLE_LICENSE_HEADER_END@ + * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */ /* @@ -62,6 +68,7 @@ #define __UNION_UNION_H__ #include +#include #ifdef __APPLE_API_PRIVATE struct union_args { @@ -69,20 +76,50 @@ struct union_args { int mntflags; /* Options on the mount */ }; -#define UNMNT_ABOVE 0x0001 /* Target appears below mount point */ +#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; - struct vnode *um_lowervp; - struct ucred *um_cred; /* Credentials of user calling 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]*/ }; -#ifdef KERNEL + +#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. @@ -98,51 +135,49 @@ struct union_mount { 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 */ - off_t un_uppersz; /* size of upper object */ - off_t un_lowersz; /* size of lower object */ -#if DIAGNOSTIC - pid_t un_pid; -#endif }; -#define UN_WANT 0x01 -#define UN_LOCKED 0x02 -#define UN_ULOCK 0x04 /* Upper node is locked */ -#define UN_KLOCK 0x08 /* Keep upper node locked on vput */ -#define UN_CACHED 0x10 /* In union cache */ +#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 */ + -extern int union_allocvp __P((struct vnode **, struct mount *, - struct vnode *, struct vnode *, - struct componentname *, struct vnode *, - struct vnode *, int)); -extern int union_copyfile __P((struct vnode *, struct vnode *, - struct ucred *, struct proc *)); -extern int union_copyup __P((struct union_node *, int, struct ucred *, - struct proc *)); -extern int union_dowhiteout __P((struct union_node *, struct ucred *, - struct proc *)); -extern int union_mkshadow __P((struct union_mount *, struct vnode *, - struct componentname *, struct vnode **)); -extern int union_mkwhiteout __P((struct union_mount *, struct vnode *, - struct componentname *, char *)); -extern int union_vn_create __P((struct vnode **, struct union_node *, - struct proc *)); -extern int union_cn_close __P((struct vnode *, int, struct ucred *, - struct proc *)); -extern void union_removed_upper __P((struct union_node *un)); -extern struct vnode *union_lowervp __P((struct vnode *)); -extern void union_newlower __P((struct union_node *, struct vnode *)); -extern void union_newupper __P((struct union_node *, struct vnode *)); -extern void union_newsize __P((struct vnode *, off_t, off_t)); +#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) @@ -151,9 +186,37 @@ extern void union_newsize __P((struct vnode *, off_t, off_t)); #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; -#endif /* KERNEL */ +void union_lock(void); +void union_unlock(void); + +#endif /* BSD_KERNEL_PRIVATE */ #endif /* __APPLE_API_PRIVATE */ + #endif /* __UNION_UNION_H__ */