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/*
* linux/include/linux/efs_fs.h
*
* Copyright (C) 1997
* Mike Shaver (shaver@neon.ingenia.ca)
*
* Based on work Copyright (C) 1995, 1996 Christian Vogelgsang.
*
* $Id$
*/
#ifndef __LINUX_EFS_FS_H
#define __LINUX_EFS_FS_H
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/time.h>
#include <linux/stat.h>
#include <linux/fs.h>
/* SuperMagic: need a unique Identifier for EFS */
#define EFS_SUPER_MAGIC 0x280273
#define EFS_ROOT_INODE 2
#define EFS_BLK_SUPER 1
#define EFS_BLOCK_SIZE 512
#define EFS_BLOCK_SIZE_BITS 9
/* EFS Magic IDs */
#define EFS_MAGIC1 0x72959
#define EFS_MAGIC2 0x7295a
/* Offsets in VolumeDescriptor */
#define EFS_VD_FS_START 0x190 /* First FS block */
#define EFS_VD_ENTRYFIRST 0x48 /* Begin of Entry list */
#define EFS_VD_ENTRYPOS 8 /* offset for the entry position */
#define EFS_VD_ENTRYLEN 12 /* offset for the entry length */
#define EFS_VD_ENTRYSIZE 16 /* length of an entry */
/* Offsets in Superblock */
#define EFS_SB_TOTAL 0 /* Number of Blocks used for filesystem */
#define EFS_SB_FIRST 4 /* BB of Begin First Cylinder Group */
#define EFS_SB_GROUP 8 /* BBs per Group */
#define EFS_SB_INODE 12 /* BBs used for Inodes at begin of group */
#define EFS_SB_TOGRP 18 /* Number of Groups in Filesystem */
#define EFS_SB_MAGIC 28
struct efs_super_block {
__u32 s_size;
__u32 s_firstcg;
__u32 s_cgfsize;
__u16 s_cgisize;
__u16 s_sectors;
__u16 s_heads;
__u16 s_ncg;
__u16 s_dirty;
__u32 s_time;
__u32 s_magic;
char s_fname[6];
char s_fpack[6];
__u32 s_bmsize;
__u32 s_tfree;
__u32 s_tinode;
__u32 s_bmblock;
__u32 s_replsb;
__u32 s_lastialloc;
char s_spare[20]; /* Must be zero */
__u32 s_checksum;
};
#ifdef DEBUG
void efs_dump_super(struct efs_super_block *);
#endif
#define EFS_MAX_EXTENTS 12
/* odev is used by "pre-extended-dev_t" IRIX EFS implementations, and
later ones use odev and ndev together */
struct efs_devs {
__u16 odev;
__u32 ndev;
};
union efs_extent {
struct {
__u32 ex_magic:4, /* must be zero */
ex_bn:24;
__u32 ex_length:8,
ex_offset;
} ex_ex;
__u32 ex_bytes[2];
};
struct efs_disk_inode {
__u16 di_mode;
__u16 di_nlink;
__u16 di_uid;
__u16 di_gid;
__u32 di_size;
__u32 di_atime;
__u32 di_mtime;
__u32 di_ctime;
__u32 di_gen;
__u16 di_numextents;
__u8 di_version;
__u8 di_spare;
union di_addr {
union efs_extent di_extents[EFS_MAX_EXTENTS];
struct efs_devs di_dev;
} di_u;
};
/* Offsets in DirBlock */
#define EFS_DB_ENTRIES 3
#define EFS_DB_FIRST 4
#define EFS_DIRBLK_MAGIC 0xBEEF
#define EFS_DIRBLK_HEADERSIZE 4
#define EFS_DIRBLK_SIZE EFS_BLOCK_SIZE
struct efs_dirblk {
__u16 db_magic; /* 0xBEEF */
__u8 db_firstused;
__u8 db_slots;
__u8 db_space[EFS_DIRBLK_SIZE - EFS_DIRBLK_HEADERSIZE];
};
/* Offsets in DirItem */
#define EFS_DI_NAMELEN 4
#define EFS_DI_NAME 5
struct efs_dent {
union {
__u32 l;
__u16 s[2];
} ud_inum;
__u8 d_namelen;
__u8 d_name[3];
};
#define EFS_EXT_PER_BLK_BITS 5
#define EFS_EXT_PER_BLK_MASK 63
#define EFS_EXT_SIZE_BITS 3
/* define a few convenient types */
#if 0
typedef unsigned char BYTE; /* 8 bit */
typedef unsigned short SHORT; /* 16 bit */
typedef unsigned long LONG; /* 32 bit */
#endif
#ifdef __KERNEL__
struct efs_dir_entry {
__u16 inode;
char name[0];
};
/* Byte swapping 32/16-bit quantities into little endian format. */
#define efs_need_swab 0
/* extern int efs_need_swab; */
extern __inline__ __u32 efs_swab32(__u32 value)
{
return (efs_need_swab ? ((value >> 24) |
((value >> 8) & 0xff00) |
((value << 8) & 0xff0000) |
(value << 24)) : value);
}
extern __inline__ __u16 efs_swab16(__u16 value)
{
return (efs_need_swab ? ((value >> 8) |
(value << 8)) : value);
}
int init_efs_fs(void);
/* Inode Method structures for Dirs, Files and Symlinks */
extern struct inode_operations efs_dir_in_ops;
extern struct inode_operations efs_file_in_ops;
extern struct inode_operations efs_symlink_in_ops;
/* exported Prototypes */
extern int efs_bmap(struct inode *,int);
extern __u32 ConvertLong(__u8 *buf,int off);
extern __u16 ConvertShort(__u8 *buf,int off);
#endif /* __KERNEL__ */
#endif /* __LINUX_EFS_FS_H */
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