fs/xiafs/xiafs

/* */
   1 /*
   2  *  linux/fs/xiafs/xiafs_mac.h
   3  *
   4  *  Copyright (C) Q. Frank Xia, 1993.
   5  */
   6 
   7 extern char internal_error_message[];
   8 #define INTERN_ERR              internal_error_message, __FILE__, __LINE__
   9 #define WHERE_ERR               __FILE__, __LINE__
  10 
  11 #define XIAFS_ZSHIFT(sp)                ((sp)->u.xiafs_sb.s_zone_shift)
  12 #define XIAFS_ZSIZE(sp)         (BLOCK_SIZE << XIAFS_ZSHIFT(sp))
  13 #define XIAFS_ZSIZE_BITS(sp)    (BLOCK_SIZE_BITS + XIAFS_ZSHIFT(sp))
  14 #define XIAFS_ADDRS_PER_Z(sp)           (BLOCK_SIZE >> (2 - XIAFS_ZSHIFT(sp)))
  15 #define XIAFS_ADDRS_PER_Z_BITS(sp)      (BLOCK_SIZE_BITS - 2 + XIAFS_ZSHIFT(sp))
  16 #define XIAFS_BITS_PER_Z(sp)    (BLOCK_SIZE  << (3 + XIAFS_ZSHIFT(sp)))
  17 #define XIAFS_BITS_PER_Z_BITS(sp)       (BLOCK_SIZE_BITS + 3 + XIAFS_ZSHIFT(sp))
  18 #define XIAFS_INODES_PER_Z(sp)  (_XIAFS_INODES_PER_BLOCK << XIAFS_ZSHIFT(sp))
  19 
  20 /* Use the most significant bytes of zone pointers to store block counter. */
  21 /* This is ugly, but it works. Note, We have another 7 bytes for "expension". */
  22 
  23 #define XIAFS_GET_BLOCKS(row_ip, blocks)  \
  24   blocks=((((row_ip)->i_zone[0] >> 24) & 0xff )|\
  25           (((row_ip)->i_zone[1] >> 16) & 0xff00 )|\
  26           (((row_ip)->i_zone[2] >>  8) & 0xff0000 ) )
  27 
  28 /* XIAFS_PUT_BLOCKS should be called before saving zone pointers */
  29 #define XIAFS_PUT_BLOCKS(row_ip, blocks)  \
  30   (row_ip)->i_zone[2]=((blocks)<< 8) & 0xff000000;\
  31   (row_ip)->i_zone[1]=((blocks)<<16) & 0xff000000;\
  32   (row_ip)->i_zone[0]=((blocks)<<24) & 0xff000000
/* */
root/fs/xiafs/xiafs_mac.h

INCLUDED FROM
