LXR linux/fs/minix/itree

   1#include <linux/buffer_head.h>
   2#include "minix.h"
   3
   4enum {DEPTH = 3, DIRECT = 7};   /* Only double indirect */
   5
   6typedef u16 block_t;    /* 16 bit, host order */
   7
   8static inline unsigned long block_to_cpu(block_t n)
   9{
  10        return n;
  11}
  12
  13static inline block_t cpu_to_block(unsigned long n)
  14{
  15        return n;
  16}
  17
  18static inline block_t *i_data(struct inode *inode)
  19{
  20        return (block_t *)minix_i(inode)->u.i1_data;
  21}
  22
  23static int block_to_path(struct inode * inode, long block, int offsets[DEPTH])
  24{
  25        int n = 0;
  26        char b[BDEVNAME_SIZE];
  27
  28        if (block < 0) {
  29                printk("MINIX-fs: block_to_path: block %ld < 0 on dev %s\n",
  30                        block, bdevname(inode->i_sb->s_bdev, b));
  31        } else if (block >= (minix_sb(inode->i_sb)->s_max_size/BLOCK_SIZE)) {
  32                if (printk_ratelimit())
  33                        printk("MINIX-fs: block_to_path: "
  34                               "block %ld too big on dev %s\n",
  35                                block, bdevname(inode->i_sb->s_bdev, b));
  36        } else if (block < 7) {
  37                offsets[n++] = block;
  38        } else if ((block -= 7) < 512) {
  39                offsets[n++] = 7;
  40                offsets[n++] = block;
  41        } else {
  42                block -= 512;
  43                offsets[n++] = 8;
  44                offsets[n++] = block>>9;
  45                offsets[n++] = block & 511;
  46        }
  47        return n;
  48}
  49
  50#include "itree_common.c"
  51
  52int V1_minix_get_block(struct inode * inode, long block,
  53                        struct buffer_head *bh_result, int create)
  54{
  55        return get_block(inode, block, bh_result, create);
  56}
  57
  58void V1_minix_truncate(struct inode * inode)
  59{
  60        truncate(inode);
  61}
  62
  63unsigned V1_minix_blocks(loff_t size, struct super_block *sb)
  64{
  65        return nblocks(size, sb);
  66}
  67