LXR linux/fs/minix/itree

   1// SPDX-License-Identifier: GPL-2.0
   2#include <linux/buffer_head.h>
   3#include <linux/slab.h>
   4#include "minix.h"
   5
   6enum {DEPTH = 3, DIRECT = 7};   /* Only double indirect */
   7
   8typedef u16 block_t;    /* 16 bit, host order */
   9
  10static inline unsigned long block_to_cpu(block_t n)
  11{
  12        return n;
  13}
  14
  15static inline block_t cpu_to_block(unsigned long n)
  16{
  17        return n;
  18}
  19
  20static inline block_t *i_data(struct inode *inode)
  21{
  22        return (block_t *)minix_i(inode)->u.i1_data;
  23}
  24
  25static int block_to_path(struct inode * inode, long block, int offsets[DEPTH])
  26{
  27        int n = 0;
  28
  29        if (block < 0) {
  30                printk("MINIX-fs: block_to_path: block %ld < 0 on dev %pg\n",
  31                        block, inode->i_sb->s_bdev);
  32                return 0;
  33        }
  34        if ((u64)block * BLOCK_SIZE >= inode->i_sb->s_maxbytes)
  35                return 0;
  36
  37        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