1/* SPDX-License-Identifier: GPL-2.0 */ 2/* 3 * Copyright (c) 1999 Al Smith, <Al.Smith@aeschi.ch.eu.org> 4 * 5 * Portions derived from work (c) 1995,1996 Christian Vogelgsang. 6 * Portions derived from IRIX header files (c) 1988 Silicon Graphics 7 */ 8#ifndef _EFS_EFS_H_ 9#define _EFS_EFS_H_ 10 11#ifdef pr_fmt 12#undef pr_fmt 13#endif 14 15#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 16 17#include <linux/fs.h> 18#include <linux/uaccess.h> 19 20#define EFS_VERSION "1.0a" 21 22/* 1 block is 512 bytes */ 23#define EFS_BLOCKSIZE_BITS 9 24#define EFS_BLOCKSIZE (1 << EFS_BLOCKSIZE_BITS) 25 26typedef int32_t efs_block_t; 27typedef uint32_t efs_ino_t; 28 29#define EFS_DIRECTEXTENTS 12 30 31/* 32 * layout of an extent, in memory and on disk. 8 bytes exactly. 33 */ 34typedef union extent_u { 35 unsigned char raw[8]; 36 struct extent_s { 37 unsigned int ex_magic:8; /* magic # (zero) */ 38 unsigned int ex_bn:24; /* basic block */ 39 unsigned int ex_length:8; /* numblocks in this extent */ 40 unsigned int ex_offset:24; /* logical offset into file */ 41 } cooked; 42} efs_extent; 43 44typedef struct edevs { 45 __be16 odev; 46 __be32 ndev; 47} efs_devs; 48 49/* 50 * extent based filesystem inode as it appears on disk. The efs inode 51 * is exactly 128 bytes long. 52 */ 53struct efs_dinode { 54 __be16 di_mode; /* mode and type of file */ 55 __be16 di_nlink; /* number of links to file */ 56 __be16 di_uid; /* owner's user id */ 57 __be16 di_gid; /* owner's group id */ 58 __be32 di_size; /* number of bytes in file */ 59 __be32 di_atime; /* time last accessed */ 60 __be32 di_mtime; /* time last modified */ 61 __be32 di_ctime; /* time created */ 62 __be32 di_gen; /* generation number */ 63 __be16 di_numextents; /* # of extents */ 64 u_char di_version; /* version of inode */ 65 u_char di_spare; /* spare - used by AFS */ 66 union di_addr { 67 efs_extent di_extents[EFS_DIRECTEXTENTS]; 68 efs_devs di_dev; /* device for IFCHR/IFBLK */ 69 } di_u; 70}; 71 72/* efs inode storage in memory */ 73struct efs_inode_info { 74 int numextents; 75 int lastextent; 76 77 efs_extent extents[EFS_DIRECTEXTENTS]; 78 struct inode vfs_inode; 79}; 80 81#include <linux/efs_fs_sb.h> 82 83#define EFS_DIRBSIZE_BITS EFS_BLOCKSIZE_BITS 84#define EFS_DIRBSIZE (1 << EFS_DIRBSIZE_BITS) 85 86struct efs_dentry { 87 __be32 inode; 88 unsigned char namelen; 89 char name[3]; 90}; 91 92#define EFS_DENTSIZE (sizeof(struct efs_dentry) - 3 + 1) 93#define EFS_MAXNAMELEN ((1 << (sizeof(char) * 8)) - 1) 94 95#define EFS_DIRBLK_HEADERSIZE 4 96#define EFS_DIRBLK_MAGIC 0xbeef /* moo */ 97 98struct efs_dir { 99 __be16 magic; 100 unsigned char firstused; 101 unsigned char slots; 102 103 unsigned char space[EFS_DIRBSIZE - EFS_DIRBLK_HEADERSIZE]; 104}; 105 106#define EFS_MAXENTS \ 107 ((EFS_DIRBSIZE - EFS_DIRBLK_HEADERSIZE) / \ 108 (EFS_DENTSIZE + sizeof(char))) 109 110#define EFS_SLOTAT(dir, slot) EFS_REALOFF((dir)->space[slot]) 111 112#define EFS_REALOFF(offset) ((offset << 1)) 113 114 115static inline struct efs_inode_info *INODE_INFO(struct inode *inode) 116{ 117 return container_of(inode, struct efs_inode_info, vfs_inode); 118} 119 120static inline struct efs_sb_info *SUPER_INFO(struct super_block *sb) 121{ 122 return sb->s_fs_info; 123} 124 125struct statfs; 126struct fid; 127 128extern const struct inode_operations efs_dir_inode_operations; 129extern const struct file_operations efs_dir_operations; 130extern const struct address_space_operations efs_symlink_aops; 131 132extern struct inode *efs_iget(struct super_block *, unsigned long); 133extern efs_block_t efs_map_block(struct inode *, efs_block_t); 134extern int efs_get_block(struct inode *, sector_t, struct buffer_head *, int); 135 136extern struct dentry *efs_lookup(struct inode *, struct dentry *, unsigned int); 137extern struct dentry *efs_fh_to_dentry(struct super_block *sb, struct fid *fid, 138 int fh_len, int fh_type); 139extern struct dentry *efs_fh_to_parent(struct super_block *sb, struct fid *fid, 140 int fh_len, int fh_type); 141extern struct dentry *efs_get_parent(struct dentry *); 142extern int efs_bmap(struct inode *, int); 143 144#endif /* _EFS_EFS_H_ */ 145