fs/minix/itree_v1.c

   1 #include <linux/buffer_head.h>
   2 #include "minix.h"
   3
   4 enum {DEPTH = 3, DIRECT = 7};   /* Only double indirect */
   5
   6 typedef u16 block_t;    /* 16 bit, host order */
   7
   8 static inline unsigned long block_to_cpu(block_t n)
   9 {
  10         return n;
  11 }
  12
  13 static inline block_t cpu_to_block(unsigned long n)
  14 {
  15         return n;
  16 }
  17
  18 static inline block_t *i_data(struct inode *inode)
  19 {
  20         return (block_t *)minix_i(inode)->u.i1_data;
  21 }
  22
  23 static int block_to_path(struct inode * inode, long block, int offsets[DEPTH])
  24 {
  25         int n = 0;
  26
  27         if (block < 0) {
  28                 printk("minix_bmap: block<0");
  29         } else if (block >= (minix_sb(inode->i_sb)->s_max_size/BLOCK_SIZE)) {
  30                 printk("minix_bmap: block>big");
  31         } else if (block < 7) {
  32                 offsets[n++] = block;
  33         } else if ((block -= 7) < 512) {
  34                 offsets[n++] = 7;
  35                 offsets[n++] = block;
  36         } else {
  37                 block -= 512;
  38                 offsets[n++] = 8;
  39                 offsets[n++] = block>>9;
  40                 offsets[n++] = block & 511;
  41         }
  42         return n;
  43 }
  44
  45 #include "itree_common.c"
  46
  47 int V1_minix_get_block(struct inode * inode, long block,
  48                         struct buffer_head *bh_result, int create)
  49 {
  50         return get_block(inode, block, bh_result, create);
  51 }
  52
  53 void V1_minix_truncate(struct inode * inode)
  54 {
  55         truncate(inode);
  56 }
  57
  58 unsigned V1_minix_blocks(loff_t size)
  59 {
  60         return nblocks(size);
  61 }