148 lines
3.8 KiB
C
148 lines
3.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (c) 1999 Al Smith
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*
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* Portions derived from work (c) 1995,1996 Christian Vogelgsang.
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* Portions derived from IRIX header files (c) 1988 Silicon Graphics
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*/
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#ifndef _EFS_EFS_H_
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#define _EFS_EFS_H_
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#ifdef pr_fmt
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#undef pr_fmt
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#endif
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/fs.h>
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#include <linux/uaccess.h>
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#define EFS_VERSION "1.0a"
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static const char cprt[] = "EFS: "EFS_VERSION" - (c) 1999 Al Smith <Al.Smith@aeschi.ch.eu.org>";
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/* 1 block is 512 bytes */
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#define EFS_BLOCKSIZE_BITS 9
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#define EFS_BLOCKSIZE (1 << EFS_BLOCKSIZE_BITS)
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typedef int32_t efs_block_t;
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typedef uint32_t efs_ino_t;
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#define EFS_DIRECTEXTENTS 12
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/*
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* layout of an extent, in memory and on disk. 8 bytes exactly.
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*/
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typedef union extent_u {
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unsigned char raw[8];
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struct extent_s {
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unsigned int ex_magic:8; /* magic # (zero) */
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unsigned int ex_bn:24; /* basic block */
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unsigned int ex_length:8; /* numblocks in this extent */
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unsigned int ex_offset:24; /* logical offset into file */
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} cooked;
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} efs_extent;
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typedef struct edevs {
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__be16 odev;
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__be32 ndev;
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} efs_devs;
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/*
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* extent based filesystem inode as it appears on disk. The efs inode
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* is exactly 128 bytes long.
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*/
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struct efs_dinode {
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__be16 di_mode; /* mode and type of file */
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__be16 di_nlink; /* number of links to file */
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__be16 di_uid; /* owner's user id */
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__be16 di_gid; /* owner's group id */
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__be32 di_size; /* number of bytes in file */
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__be32 di_atime; /* time last accessed */
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__be32 di_mtime; /* time last modified */
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__be32 di_ctime; /* time created */
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__be32 di_gen; /* generation number */
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__be16 di_numextents; /* # of extents */
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u_char di_version; /* version of inode */
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u_char di_spare; /* spare - used by AFS */
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union di_addr {
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efs_extent di_extents[EFS_DIRECTEXTENTS];
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efs_devs di_dev; /* device for IFCHR/IFBLK */
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} di_u;
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};
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/* efs inode storage in memory */
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struct efs_inode_info {
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int numextents;
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int lastextent;
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efs_extent extents[EFS_DIRECTEXTENTS];
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struct inode vfs_inode;
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};
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#include <linux/efs_fs_sb.h>
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#define EFS_DIRBSIZE_BITS EFS_BLOCKSIZE_BITS
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#define EFS_DIRBSIZE (1 << EFS_DIRBSIZE_BITS)
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struct efs_dentry {
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__be32 inode;
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unsigned char namelen;
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char name[3];
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};
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#define EFS_DENTSIZE (sizeof(struct efs_dentry) - 3 + 1)
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#define EFS_MAXNAMELEN ((1 << (sizeof(char) * 8)) - 1)
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#define EFS_DIRBLK_HEADERSIZE 4
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#define EFS_DIRBLK_MAGIC 0xbeef /* moo */
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struct efs_dir {
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__be16 magic;
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unsigned char firstused;
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unsigned char slots;
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unsigned char space[EFS_DIRBSIZE - EFS_DIRBLK_HEADERSIZE];
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};
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#define EFS_MAXENTS \
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((EFS_DIRBSIZE - EFS_DIRBLK_HEADERSIZE) / \
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(EFS_DENTSIZE + sizeof(char)))
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#define EFS_SLOTAT(dir, slot) EFS_REALOFF((dir)->space[slot])
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#define EFS_REALOFF(offset) ((offset << 1))
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static inline struct efs_inode_info *INODE_INFO(struct inode *inode)
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{
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return container_of(inode, struct efs_inode_info, vfs_inode);
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}
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static inline struct efs_sb_info *SUPER_INFO(struct super_block *sb)
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{
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return sb->s_fs_info;
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}
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struct statfs;
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struct fid;
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extern const struct inode_operations efs_dir_inode_operations;
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extern const struct file_operations efs_dir_operations;
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extern const struct address_space_operations efs_symlink_aops;
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extern struct inode *efs_iget(struct super_block *, unsigned long);
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extern efs_block_t efs_map_block(struct inode *, efs_block_t);
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extern int efs_get_block(struct inode *, sector_t, struct buffer_head *, int);
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extern struct dentry *efs_lookup(struct inode *, struct dentry *, unsigned int);
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extern struct dentry *efs_fh_to_dentry(struct super_block *sb, struct fid *fid,
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int fh_len, int fh_type);
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extern struct dentry *efs_fh_to_parent(struct super_block *sb, struct fid *fid,
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int fh_len, int fh_type);
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extern struct dentry *efs_get_parent(struct dentry *);
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extern int efs_bmap(struct inode *, int);
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#endif /* _EFS_EFS_H_ */
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