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Linux/fs/efs/efs.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 /*
  3  * Copyright (c) 1999 Al Smith
  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 static const char cprt[] = "EFS: "EFS_VERSION" - (c) 1999 Al Smith <Al.Smith@aeschi.ch.eu.org>";
 23 
 24 
 25 /* 1 block is 512 bytes */
 26 #define EFS_BLOCKSIZE_BITS      9
 27 #define EFS_BLOCKSIZE           (1 << EFS_BLOCKSIZE_BITS)
 28 
 29 typedef int32_t         efs_block_t;
 30 typedef uint32_t        efs_ino_t;
 31 
 32 #define EFS_DIRECTEXTENTS       12
 33 
 34 /*
 35  * layout of an extent, in memory and on disk. 8 bytes exactly.
 36  */
 37 typedef union extent_u {
 38         unsigned char raw[8];
 39         struct extent_s {
 40                 unsigned int    ex_magic:8;     /* magic # (zero) */
 41                 unsigned int    ex_bn:24;       /* basic block */
 42                 unsigned int    ex_length:8;    /* numblocks in this extent */
 43                 unsigned int    ex_offset:24;   /* logical offset into file */
 44         } cooked;
 45 } efs_extent;
 46 
 47 typedef struct edevs {
 48         __be16          odev;
 49         __be32          ndev;
 50 } efs_devs;
 51 
 52 /*
 53  * extent based filesystem inode as it appears on disk.  The efs inode
 54  * is exactly 128 bytes long.
 55  */
 56 struct  efs_dinode {
 57         __be16          di_mode;        /* mode and type of file */
 58         __be16          di_nlink;       /* number of links to file */
 59         __be16          di_uid;         /* owner's user id */
 60         __be16          di_gid;         /* owner's group id */
 61         __be32          di_size;        /* number of bytes in file */
 62         __be32          di_atime;       /* time last accessed */
 63         __be32          di_mtime;       /* time last modified */
 64         __be32          di_ctime;       /* time created */
 65         __be32          di_gen;         /* generation number */
 66         __be16          di_numextents;  /* # of extents */
 67         u_char          di_version;     /* version of inode */
 68         u_char          di_spare;       /* spare - used by AFS */
 69         union di_addr {
 70                 efs_extent      di_extents[EFS_DIRECTEXTENTS];
 71                 efs_devs        di_dev; /* device for IFCHR/IFBLK */
 72         } di_u;
 73 };
 74 
 75 /* efs inode storage in memory */
 76 struct efs_inode_info {
 77         int             numextents;
 78         int             lastextent;
 79 
 80         efs_extent      extents[EFS_DIRECTEXTENTS];
 81         struct inode    vfs_inode;
 82 };
 83 
 84 #include <linux/efs_fs_sb.h>
 85 
 86 #define EFS_DIRBSIZE_BITS       EFS_BLOCKSIZE_BITS
 87 #define EFS_DIRBSIZE            (1 << EFS_DIRBSIZE_BITS)
 88 
 89 struct efs_dentry {
 90         __be32          inode;
 91         unsigned char   namelen;
 92         char            name[3];
 93 };
 94 
 95 #define EFS_DENTSIZE    (sizeof(struct efs_dentry) - 3 + 1)
 96 #define EFS_MAXNAMELEN  ((1 << (sizeof(char) * 8)) - 1)
 97 
 98 #define EFS_DIRBLK_HEADERSIZE   4
 99 #define EFS_DIRBLK_MAGIC        0xbeef  /* moo */
100 
101 struct efs_dir {
102         __be16  magic;
103         unsigned char   firstused;
104         unsigned char   slots;
105 
106         unsigned char   space[EFS_DIRBSIZE - EFS_DIRBLK_HEADERSIZE];
107 };
108 
109 #define EFS_MAXENTS \
110         ((EFS_DIRBSIZE - EFS_DIRBLK_HEADERSIZE) / \
111          (EFS_DENTSIZE + sizeof(char)))
112 
113 #define EFS_SLOTAT(dir, slot) EFS_REALOFF((dir)->space[slot])
114 
115 #define EFS_REALOFF(offset) ((offset << 1))
116 
117 
118 static inline struct efs_inode_info *INODE_INFO(struct inode *inode)
119 {
120         return container_of(inode, struct efs_inode_info, vfs_inode);
121 }
122 
123 static inline struct efs_sb_info *SUPER_INFO(struct super_block *sb)
124 {
125         return sb->s_fs_info;
126 }
127 
128 struct statfs;
129 struct fid;
130 
131 extern const struct inode_operations efs_dir_inode_operations;
132 extern const struct file_operations efs_dir_operations;
133 extern const struct address_space_operations efs_symlink_aops;
134 
135 extern struct inode *efs_iget(struct super_block *, unsigned long);
136 extern efs_block_t efs_map_block(struct inode *, efs_block_t);
137 extern int efs_get_block(struct inode *, sector_t, struct buffer_head *, int);
138 
139 extern struct dentry *efs_lookup(struct inode *, struct dentry *, unsigned int);
140 extern struct dentry *efs_fh_to_dentry(struct super_block *sb, struct fid *fid,
141                 int fh_len, int fh_type);
142 extern struct dentry *efs_fh_to_parent(struct super_block *sb, struct fid *fid,
143                 int fh_len, int fh_type);
144 extern struct dentry *efs_get_parent(struct dentry *);
145 extern int efs_bmap(struct inode *, int);
146 
147 #endif /* _EFS_EFS_H_ */
148 

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