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/* ----------------------------------------------------------------------- *
*
* Copyright 2001 Bernhard M. Wiedemann - All Rights Reserved
*
* This file is part of the translucency kernel module.
* translucency is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License
* see file COPYING for more details
*
* ----------------------------------------------------------------------- */
#ifndef _BASE_H_INCLUDED_
#define _BASE_H_INCLUDED_
#define MAKING_MODULES 1
#include <linux/autoconf.h>
#ifdef CONFIG_MODVERSIONS
#include <linux/modversions.h>
#endif
#include <stdarg.h>
#include <linux/types.h>
#include <asm/current.h>
#include <asm/uaccess.h>
#include <asm/string.h>
#include <asm/segment.h>
#include <asm/unistd.h>
#include <linux/sched.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/stat.h>
#include <linux/dirent.h>
#include <linux/fs_struct.h>
#include <linux/proc_fs.h>
#include <linux/unistd.h>
#include <linux/sysctl.h>
#include <linux/utime.h>
#include <linux/ctype.h>
#include "compatibility.h"
#include "extension.h"
#define LOOKUP_MKDIR 0x80000000
#define LOOKUP_CREATE 0x40000000
#define LOOKUP_OPEN 0x20000000
#define LOOKUP_NOSPECIAL 0x20000000
#define LOOKUP_TRUNCATE 0x10000000
#define LOOKUP_CREATES 0x08000000
#define LOOKUP_NOFOLLOW 0x04000000
#define LOOKUP_TRANSLUCENCY_MASK 0x07ffffff
// 2000 here is too much, since kernel stack is small and mymkdir does one recursion
#define REDIR_BUFSIZE 511
#define dflags 0
#define ANYUID -1
#define SYSLOGID "translucency"
#define REDIRS 8
#define MAX_LAYERS 8
struct translucent {
#define valid_translucency (0x77abc713)
#define is_valid(t) ((t)->valid == valid_translucency)
unsigned long valid;
char flags;
int index; /* up to REDIRS possible */
int layers;
struct nameidata n[MAX_LAYERS];
char b[REDIR_BUFSIZE];
};
#define CTL_TABLE_BASE 0x89194729
#define CTL_TABLE_STATIC 7
#define CTL_ENTRY_BASE (CTL_TABLE_BASE+CTL_TABLE_STATIC)
extern void* sys_call_table[];
extern struct translucent redirs[REDIRS];
extern int translucent_uid;
extern int translucent_gid;
extern int translucent_flags;
#define no_translucency (1<<0)
#define no_copyonwrite (1<<1)
#define no_getdents (1<<2)
#define do_downcase (1<<3)
#define no_whiteout (1<<4)
extern struct ctl_table_header *redirection_table_header;
extern struct ctl_table redirection_table[];
#define BEGIN_KMEM {mm_segment_t old_fs=get_fs();set_fs(KERNEL_DS);
#define END_KMEM set_fs(old_fs);}
//#define DEBUG
#define OUR_DEBUG_DOMAIN 0
#define OUR_DEBUG_LEVEL 0
#define OUR_DEBUG_MERGE 0x40000000
#define OUR_DEBUG_REDIR 0x20000000
#define OUR_DEBUG_ALL 0xffffff00
#ifdef DEBUG
#define DPRINTK(x...) (printk(KERN_INFO SYSLOGID ": " __FILE__ ":%i:" \
__FUNCTION__ "() ", __LINE__) , \
printk(##x),printk("\n"))
/// debug output with level checking
#define DPRINTKL(n,x...) if((((n)&0xff)<=OUR_DEBUG_LEVEL) && ((OUR_DEBUG_DOMAIN)&(n))) {\
(printk(KERN_INFO __FILE__ ":%i:" \
__FUNCTION__ "() ", __LINE__) , \
printk(##x),printk("\n")); }
#else
#define DPRINTK(x...)
#define DPRINTKL(n,x...)
#endif /* not DEBUG */
void redirect_namei (struct nameidata *dest, const struct nameidata *src);
int have_inode (struct nameidata *);
int is_special (struct nameidata *);
int is_subdir (struct dentry *dir, struct dentry *parent);
void absolutize (char *name, struct dentry *d, struct vfsmount *m);
int translucent_create_whiteout(char *file);
int redirect_path_walk (char *name, char **endp, struct nameidata *n, struct translucent *t);
int redirect_path (char *fname, struct translucent *t, int flags);
void init_redir_calltable (void);
void restore_redir_calltable (void);
static inline int wredirectt(struct translucent *t, char *a) { return redirect_path(a,t,dflags|LOOKUP_MKDIR|LOOKUP_CREATE); }
static inline int dredirectt(struct translucent *t, char *a) { return redirect_path(a,t,dflags|LOOKUP_MKDIR); }
static inline int redirectt(struct translucent *t, char *a) { return redirect_path(a,t,dflags); }
static inline int tredirect0(char *a) { return redirect_path(a,0,dflags|LOOKUP_MKDIR|LOOKUP_CREATE|LOOKUP_TRUNCATE); }
static inline int wredirect0(char *a) { return redirect_path(a,0,dflags|LOOKUP_MKDIR|LOOKUP_CREATE); }
static inline int dredirect0(char *a) { return redirect_path(a,0,dflags|LOOKUP_MKDIR); }
static inline int redirect0(char *a) { return redirect_path(a,0,dflags); }
static inline int redirect2(char *a, int flags) { return redirect_path(a,0,flags); }
static inline char *namei_to_path(struct nameidata *n, char *buf)
{ return d_path((n)->dentry, (n)->mnt, buf, REDIR_BUFSIZE); }
static inline int no_fallback(int error) // return false if fallback to original filename is wanted
{ return (error!=-ENOENT && error!=-EROFS); }
#endif /* not _BASE_H_INCLUDED_ */
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