include/linux/minix_fs.h

   1 #ifndef _LINUX_MINIX_FS_H
   2 #define _LINUX_MINIX_FS_H
   3
   4 /*
   5  * The minix filesystem constants/structures
   6  */
   7
   8 /*
   9  * Thanks to Kees J Bot for sending me the definitions of the new
  10  * minix filesystem (aka V2) with bigger inodes and 32-bit block
  11  * pointers.
  12  */
  13
  14 #define MINIX_ROOT_INO 1
  15
  16 /* Not the same as the bogus LINK_MAX in <linux/limits.h>. Oh well. */
  17 #define MINIX_LINK_MAX  250
  18 #define MINIX2_LINK_MAX 65530
  19
  20 #define MINIX_I_MAP_SLOTS       8
  21 #define MINIX_Z_MAP_SLOTS       64
  22 #define MINIX_SUPER_MAGIC       0x137F          /* original minix fs */
  23 #define MINIX_SUPER_MAGIC2      0x138F          /* minix fs, 30 char names */
  24 #define MINIX2_SUPER_MAGIC      0x2468          /* minix V2 fs */
  25 #define MINIX2_SUPER_MAGIC2     0x2478          /* minix V2 fs, 30 char names */
  26 #define MINIX_VALID_FS          0x0001          /* Clean fs. */
  27 #define MINIX_ERROR_FS          0x0002          /* fs has errors. */
  28
  29 #define MINIX_INODES_PER_BLOCK ((BLOCK_SIZE)/(sizeof (struct minix_inode)))
  30 #define MINIX2_INODES_PER_BLOCK ((BLOCK_SIZE)/(sizeof (struct minix2_inode)))
  31
  32 #define MINIX_V1                0x0001          /* original minix fs */
  33 #define MINIX_V2                0x0002          /* minix V2 fs */
  34
  35 #define INODE_VERSION(inode)    inode->i_sb->u.minix_sb.s_version
  36
  37 /*
  38  * This is the original minix inode layout on disk.
  39  * Note the 8-bit gid and atime and ctime.
  40  */
  41 struct minix_inode {
  42         __u16 i_mode;
  43         __u16 i_uid;
  44         __u32 i_size;
  45         __u32 i_time;
  46         __u8  i_gid;
  47         __u8  i_nlinks;
  48         __u16 i_zone[9];
  49 };
  50
  51 /*
  52  * The new minix inode has all the time entries, as well as
  53  * long block numbers and a third indirect block (7+1+1+1
  54  * instead of 7+1+1). Also, some previously 8-bit values are
  55  * now 16-bit. The inode is now 64 bytes instead of 32.
  56  */
  57 struct minix2_inode {
  58         __u16 i_mode;
  59         __u16 i_nlinks;
  60         __u16 i_uid;
  61         __u16 i_gid;
  62         __u32 i_size;
  63         __u32 i_atime;
  64         __u32 i_mtime;
  65         __u32 i_ctime;
  66         __u32 i_zone[10];
  67 };
  68
  69 /*
  70  * minix super-block data on disk
  71  */
  72 struct minix_super_block {
  73         __u16 s_ninodes;
  74         __u16 s_nzones;
  75         __u16 s_imap_blocks;
  76         __u16 s_zmap_blocks;
  77         __u16 s_firstdatazone;
  78         __u16 s_log_zone_size;
  79         __u32 s_max_size;
  80         __u16 s_magic;
  81         __u16 s_state;
  82         __u32 s_zones;
  83 };
  84
  85 struct minix_dir_entry {
  86         __u16 inode;
  87         char name[0];
  88 };
  89
  90 #ifdef __KERNEL__
  91
  92 extern struct inode * minix_new_inode(const struct inode * dir, int * error);
  93 extern void minix_free_inode(struct inode * inode);
  94 extern unsigned long minix_count_free_inodes(struct super_block *sb);
  95 extern int minix_new_block(struct inode * inode);
  96 extern void minix_free_block(struct inode * inode, int block);
  97 extern unsigned long minix_count_free_blocks(struct super_block *sb);
  98
  99 extern struct buffer_head * minix_getblk(struct inode *, int, int);
 100 extern struct buffer_head * minix_bread(struct inode *, int, int);
 101
 102 extern void V1_minix_truncate(struct inode *);
 103 extern void V2_minix_truncate(struct inode *);
 104 extern void minix_truncate(struct inode *);
 105 extern int minix_sync_inode(struct inode *);
 106 extern int V1_minix_sync_file(struct inode *);
 107 extern int V2_minix_sync_file(struct inode *);
 108 extern int V1_minix_get_block(struct inode *, long, struct buffer_head *, int);
 109 extern int V2_minix_get_block(struct inode *, long, struct buffer_head *, int);
 110
 111 extern struct address_space_operations minix_aops;
 112 extern struct inode_operations minix_file_inode_operations;
 113 extern struct inode_operations minix_dir_inode_operations;
 114 extern struct file_operations minix_file_operations;
 115 extern struct file_operations minix_dir_operations;
 116 extern struct dentry_operations minix_dentry_operations;
 117
 118 #endif /* __KERNEL__ */
 119
 120 #endif