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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 #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 

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