LXR linux/fs/minix/itree

   1#include <linux/buffer_head.h>
   2#include <linux/slab.h>
   3#include "minix.h"
   4
   5enum {DEPTH = 3, DIRECT = 7};   /* Only double indirect */
   6
   7typedef u16 block_t;    /* 16 bit, host order */
   8
   9static inline unsigned long block_to_cpu(block_t n)
  10{
  11        return n;
  12}
  13
  14static inline block_t cpu_to_block(unsigned long n)
  15{
  16        return n;
  17}
  18
  19static inline block_t *i_data(struct inode *inode)
  20{
  21        return (block_t *)minix_i(inode)->u.i1_data;
  22}
  23
  24static int block_to_path(struct inode * inode, long block, int offsets[DEPTH])
  25{
  26        int n = 0;
  27        char b[BDEVNAME_SIZE];
  28
  29        if (block < 0) {
  30                printk("MINIX-fs: block_to_path: block %ld < 0 on dev %s\n",
  31                        block, bdevname(inode->i_sb->s_bdev, b));
  32        } else if (block >= (minix_sb(inode->i_sb)->s_max_size/BLOCK_SIZE)) {
  33                if (printk_ratelimit())
  34                        printk("MINIX-fs: block_to_path: "
  35                               "block %ld too big on dev %s\n",
  36                                block, bdevname(inode->i_sb->s_bdev, b));
  37        } else if (block < 7) {
  38                offsets[n++] = block;
  39        } else if ((block -= 7) < 512) {
  40                offsets[n++] = 7;
  41                offsets[n++] = block;
  42        } else {
  43                block -= 512;
  44                offsets[n++] = 8;
  45                offsets[n++] = block>>9;
  46                offsets[n++] = block & 511;
  47        }
  48        return n;
  49}
  50
  51#include "itree_common.c"
  52
  53int V1_minix_get_block(struct inode * inode, long block,
  54                        struct buffer_head *bh_result, int create)
  55{
  56        return get_block(inode, block, bh_result, create);
  57}
  58
  59void V1_minix_truncate(struct inode * inode)
  60{
  61        truncate(inode);
  62}
  63
  64unsigned V1_minix_blocks(loff_t size, struct super_block *sb)
  65{
  66        return nblocks(size, sb);
  67}
  68