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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 Graphics7 */8#ifndef _EFS_EFS_H_9#define _EFS_EFS_H_10 11#ifdef pr_fmt12#undef pr_fmt13#endif14 15#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt16 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 924#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 1230 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 inode51 * 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_BITS84#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 496#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