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 26 typedef int32_t efs_block_t; 27 typedef 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 */ 34 typedef 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 44 typedef 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 */ 53 struct 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 */ 73 struct 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 86 struct 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 98 struct 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 INODE_INFO(struct inode * inode)115 static inline struct efs_inode_info *INODE_INFO(struct inode *inode) 116 { 117 return container_of(inode, struct efs_inode_info, vfs_inode); 118 } 119 SUPER_INFO(struct super_block * sb)120 static inline struct efs_sb_info *SUPER_INFO(struct super_block *sb) 121 { 122 return sb->s_fs_info; 123 } 124 125 struct statfs; 126 struct fid; 127 128 extern const struct inode_operations efs_dir_inode_operations; 129 extern const struct file_operations efs_dir_operations; 130 extern const struct address_space_operations efs_symlink_aops; 131 132 extern struct inode *efs_iget(struct super_block *, unsigned long); 133 extern efs_block_t efs_map_block(struct inode *, efs_block_t); 134 extern int efs_get_block(struct inode *, sector_t, struct buffer_head *, int); 135 136 extern struct dentry *efs_lookup(struct inode *, struct dentry *, unsigned int); 137 extern struct dentry *efs_fh_to_dentry(struct super_block *sb, struct fid *fid, 138 int fh_len, int fh_type); 139 extern struct dentry *efs_fh_to_parent(struct super_block *sb, struct fid *fid, 140 int fh_len, int fh_type); 141 extern struct dentry *efs_get_parent(struct dentry *); 142 extern int efs_bmap(struct inode *, int); 143 144 #endif /* _EFS_EFS_H_ */ 145