/* * Copyright (c) 1999 Al Smith * * Portions derived from work (c) 1995,1996 Christian Vogelgsang. * Portions derived from IRIX header files (c) 1988 Silicon Graphics */ #ifndef _EFS_EFS_H_ #define _EFS_EFS_H_ #include <linux/fs.h> #include <asm/uaccess.h> #define EFS_VERSION "1.0a" static const char cprt[] = "EFS: "EFS_VERSION" - (c) 1999 Al Smith <Al.Smith@aeschi.ch.eu.org>"; /* 1 block is 512 bytes */ #define EFS_BLOCKSIZE_BITS 9 #define EFS_BLOCKSIZE (1 << EFS_BLOCKSIZE_BITS) typedef int32_t efs_block_t; typedef uint32_t efs_ino_t; #define EFS_DIRECTEXTENTS 12 /* * layout of an extent, in memory and on disk. 8 bytes exactly. */ typedef union extent_u { unsigned char raw[8]; struct extent_s { unsigned int ex_magic:8; /* magic # (zero) */ unsigned int ex_bn:24; /* basic block */ unsigned int ex_length:8; /* numblocks in this extent */ unsigned int ex_offset:24; /* logical offset into file */ } cooked; } efs_extent; typedef struct edevs { __be16 odev; __be32 ndev; } efs_devs; /* * extent based filesystem inode as it appears on disk. The efs inode * is exactly 128 bytes long. */ struct efs_dinode { __be16 di_mode; /* mode and type of file */ __be16 di_nlink; /* number of links to file */ __be16 di_uid; /* owner's user id */ __be16 di_gid; /* owner's group id */ __be32 di_size; /* number of bytes in file */ __be32 di_atime; /* time last accessed */ __be32 di_mtime; /* time last modified */ __be32 di_ctime; /* time created */ __be32 di_gen; /* generation number */ __be16 di_numextents; /* # of extents */ u_char di_version; /* version of inode */ u_char di_spare; /* spare - used by AFS */ union di_addr { efs_extent di_extents[EFS_DIRECTEXTENTS]; efs_devs di_dev; /* device for IFCHR/IFBLK */ } di_u; }; /* efs inode storage in memory */ struct efs_inode_info { int numextents; int lastextent; efs_extent extents[EFS_DIRECTEXTENTS]; struct inode vfs_inode; }; #include <linux/efs_fs_sb.h> #define EFS_DIRBSIZE_BITS EFS_BLOCKSIZE_BITS #define EFS_DIRBSIZE (1 << EFS_DIRBSIZE_BITS) struct efs_dentry { __be32 inode; unsigned char namelen; char name[3]; }; #define EFS_DENTSIZE (sizeof(struct efs_dentry) - 3 + 1) #define EFS_MAXNAMELEN ((1 << (sizeof(char) * 8)) - 1) #define EFS_DIRBLK_HEADERSIZE 4 #define EFS_DIRBLK_MAGIC 0xbeef /* moo */ struct efs_dir { __be16 magic; unsigned char firstused; unsigned char slots; unsigned char space[EFS_DIRBSIZE - EFS_DIRBLK_HEADERSIZE]; }; #define EFS_MAXENTS \ ((EFS_DIRBSIZE - EFS_DIRBLK_HEADERSIZE) / \ (EFS_DENTSIZE + sizeof(char))) #define EFS_SLOTAT(dir, slot) EFS_REALOFF((dir)->space[slot]) #define EFS_REALOFF(offset) ((offset << 1)) static inline struct efs_inode_info *INODE_INFO(struct inode *inode) { return container_of(inode, struct efs_inode_info, vfs_inode); } static inline struct efs_sb_info *SUPER_INFO(struct super_block *sb) { return sb->s_fs_info; } struct statfs; struct fid; extern const struct inode_operations efs_dir_inode_operations; extern const struct file_operations efs_dir_operations; extern const struct address_space_operations efs_symlink_aops; extern struct inode *efs_iget(struct super_block *, unsigned long); extern efs_block_t efs_map_block(struct inode *, efs_block_t); extern int efs_get_block(struct inode *, sector_t, struct buffer_head *, int); extern struct dentry *efs_lookup(struct inode *, struct dentry *, unsigned int); extern struct dentry *efs_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len, int fh_type); extern struct dentry *efs_fh_to_parent(struct super_block *sb, struct fid *fid, int fh_len, int fh_type); extern struct dentry *efs_get_parent(struct dentry *); extern int efs_bmap(struct inode *, int); #endif /* _EFS_EFS_H_ */