include/linux/efs_fs_i.h

   1 /*
   2  * efs_fs_i.h
   3  *
   4  * Copyright (c) 1999 Al Smith
   5  *
   6  * Portions derived from IRIX header files (c) 1988 Silicon Graphics
   7  */
   8
   9 #ifndef __EFS_FS_I_H__
  10 #define __EFS_FS_I_H__
  11
  12 typedef int32_t         efs_block_t;
  13 typedef uint32_t        efs_ino_t;
  14
  15 #define EFS_DIRECTEXTENTS       12
  16
  17 /*
  18  * layout of an extent, in memory and on disk. 8 bytes exactly.
  19  */
  20 typedef union extent_u {
  21         unsigned char raw[8];
  22         struct extent_s {
  23                 unsigned int    ex_magic:8;     /* magic # (zero) */
  24                 unsigned int    ex_bn:24;       /* basic block */
  25                 unsigned int    ex_length:8;    /* numblocks in this extent */
  26                 unsigned int    ex_offset:24;   /* logical offset into file */
  27         } cooked;
  28 } efs_extent;
  29
  30 typedef struct edevs {
  31         __be16          odev;
  32         __be32          ndev;
  33 } efs_devs;
  34
  35 /*
  36  * extent based filesystem inode as it appears on disk.  The efs inode
  37  * is exactly 128 bytes long.
  38  */
  39 struct  efs_dinode {
  40         __be16          di_mode;        /* mode and type of file */
  41         __be16          di_nlink;       /* number of links to file */
  42         __be16          di_uid;         /* owner's user id */
  43         __be16          di_gid;         /* owner's group id */
  44         __be32          di_size;        /* number of bytes in file */
  45         __be32          di_atime;       /* time last accessed */
  46         __be32          di_mtime;       /* time last modified */
  47         __be32          di_ctime;       /* time created */
  48         __be32          di_gen;         /* generation number */
  49         __be16          di_numextents;  /* # of extents */
  50         u_char          di_version;     /* version of inode */
  51         u_char          di_spare;       /* spare - used by AFS */
  52         union di_addr {
  53                 efs_extent      di_extents[EFS_DIRECTEXTENTS];
  54                 efs_devs        di_dev; /* device for IFCHR/IFBLK */
  55         } di_u;
  56 };
  57
  58 /* efs inode storage in memory */
  59 struct efs_inode_info {
  60         int             numextents;
  61         int             lastextent;
  62
  63         efs_extent      extents[EFS_DIRECTEXTENTS];
  64         struct inode    vfs_inode;
  65 };
  66
  67 #endif  /* __EFS_FS_I_H__ */
  68