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