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TOMOYO Linux Cross Reference
Linux/fs/efs/efs.h

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  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 <asm/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 

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