1 /* 2 * Copyright (c) 1999 Al Smith 3 * 4 * Portions derived from work (c) 1995,1996 Christian Vogelgsang. 5 * Portions derived from IRIX header files (c) 1988 Silicon Graphics 6 */ 7 #ifndef _EFS_EFS_H_ 8 #define _EFS_EFS_H_ 9 10 #ifdef pr_fmt 11 #undef pr_fmt 12 #endif 13 14 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 15 16 #include <linux/fs.h> 17 #include <linux/uaccess.h> 18 19 #define EFS_VERSION "1.0a" 20 21 static const char cprt[] = "EFS: "EFS_VERSION" - (c) 1999 Al Smith <Al.Smith@aeschi.ch.eu.org>"; 22 23 24 /* 1 block is 512 bytes */ 25 #define EFS_BLOCKSIZE_BITS 9 26 #define EFS_BLOCKSIZE (1 << EFS_BLOCKSIZE_BITS) 27 28 typedef int32_t efs_block_t; 29 typedef uint32_t efs_ino_t; 30 31 #define EFS_DIRECTEXTENTS 12 32 33 /* 34 * layout of an extent, in memory and on disk. 8 bytes exactly. 35 */ 36 typedef union extent_u { 37 unsigned char raw[8]; 38 struct extent_s { 39 unsigned int ex_magic:8; /* magic # (zero) */ 40 unsigned int ex_bn:24; /* basic block */ 41 unsigned int ex_length:8; /* numblocks in this extent */ 42 unsigned int ex_offset:24; /* logical offset into file */ 43 } cooked; 44 } efs_extent; 45 46 typedef struct edevs { 47 __be16 odev; 48 __be32 ndev; 49 } efs_devs; 50 51 /* 52 * extent based filesystem inode as it appears on disk. The efs inode 53 * is exactly 128 bytes long. 54 */ 55 struct efs_dinode { 56 __be16 di_mode; /* mode and type of file */ 57 __be16 di_nlink; /* number of links to file */ 58 __be16 di_uid; /* owner's user id */ 59 __be16 di_gid; /* owner's group id */ 60 __be32 di_size; /* number of bytes in file */ 61 __be32 di_atime; /* time last accessed */ 62 __be32 di_mtime; /* time last modified */ 63 __be32 di_ctime; /* time created */ 64 __be32 di_gen; /* generation number */ 65 __be16 di_numextents; /* # of extents */ 66 u_char di_version; /* version of inode */ 67 u_char di_spare; /* spare - used by AFS */ 68 union di_addr { 69 efs_extent di_extents[EFS_DIRECTEXTENTS]; 70 efs_devs di_dev; /* device for IFCHR/IFBLK */ 71 } di_u; 72 }; 73 74 /* efs inode storage in memory */ 75 struct efs_inode_info { 76 int numextents; 77 int lastextent; 78 79 efs_extent extents[EFS_DIRECTEXTENTS]; 80 struct inode vfs_inode; 81 }; 82 83 #include <linux/efs_fs_sb.h> 84 85 #define EFS_DIRBSIZE_BITS EFS_BLOCKSIZE_BITS 86 #define EFS_DIRBSIZE (1 << EFS_DIRBSIZE_BITS) 87 88 struct efs_dentry { 89 __be32 inode; 90 unsigned char namelen; 91 char name[3]; 92 }; 93 94 #define EFS_DENTSIZE (sizeof(struct efs_dentry) - 3 + 1) 95 #define EFS_MAXNAMELEN ((1 << (sizeof(char) * 8)) - 1) 96 97 #define EFS_DIRBLK_HEADERSIZE 4 98 #define EFS_DIRBLK_MAGIC 0xbeef /* moo */ 99 100 struct efs_dir { 101 __be16 magic; 102 unsigned char firstused; 103 unsigned char slots; 104 105 unsigned char space[EFS_DIRBSIZE - EFS_DIRBLK_HEADERSIZE]; 106 }; 107 108 #define EFS_MAXENTS \ 109 ((EFS_DIRBSIZE - EFS_DIRBLK_HEADERSIZE) / \ 110 (EFS_DENTSIZE + sizeof(char))) 111 112 #define EFS_SLOTAT(dir, slot) EFS_REALOFF((dir)->space[slot]) 113 114 #define EFS_REALOFF(offset) ((offset << 1)) 115 116 117 static inline struct efs_inode_info *INODE_INFO(struct inode *inode) 118 { 119 return container_of(inode, struct efs_inode_info, vfs_inode); 120 } 121 122 static inline struct efs_sb_info *SUPER_INFO(struct super_block *sb) 123 { 124 return sb->s_fs_info; 125 } 126 127 struct statfs; 128 struct fid; 129 130 extern const struct inode_operations efs_dir_inode_operations; 131 extern const struct file_operations efs_dir_operations; 132 extern const struct address_space_operations efs_symlink_aops; 133 134 extern struct inode *efs_iget(struct super_block *, unsigned long); 135 extern efs_block_t efs_map_block(struct inode *, efs_block_t); 136 extern int efs_get_block(struct inode *, sector_t, struct buffer_head *, int); 137 138 extern struct dentry *efs_lookup(struct inode *, struct dentry *, unsigned int); 139 extern struct dentry *efs_fh_to_dentry(struct super_block *sb, struct fid *fid, 140 int fh_len, int fh_type); 141 extern struct dentry *efs_fh_to_parent(struct super_block *sb, struct fid *fid, 142 int fh_len, int fh_type); 143 extern struct dentry *efs_get_parent(struct dentry *); 144 extern int efs_bmap(struct inode *, int); 145 146 #endif /* _EFS_EFS_H_ */ 147