fs/minix/itree_v1.c

   1 #include <linux/buffer_head.h>
   2 #include <linux/slab.h>
   3 #include "minix.h"
   4
   5 enum {DEPTH = 3, DIRECT = 7};   /* Only double indirect */
   6
   7 typedef u16 block_t;    /* 16 bit, host order */
   8
   9 static inline unsigned long block_to_cpu(block_t n)
  10 {
  11         return n;
  12 }
  13
  14 static inline block_t cpu_to_block(unsigned long n)
  15 {
  16         return n;
  17 }
  18
  19 static inline block_t *i_data(struct inode *inode)
  20 {
  21         return (block_t *)minix_i(inode)->u.i1_data;
  22 }
  23
  24 static int block_to_path(struct inode * inode, long block, int offsets[DEPTH])
  25 {
  26         int n = 0;
  27
  28         if (block < 0) {
  29                 printk("MINIX-fs: block_to_path: block %ld < 0 on dev %pg\n",
  30                         block, inode->i_sb->s_bdev);
  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 %pg\n",
  35                                 block, inode->i_sb->s_bdev);
  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
  52 int 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
  58 void V1_minix_truncate(struct inode * inode)
  59 {
  60         truncate(inode);
  61 }
  62
  63 unsigned V1_minix_blocks(loff_t size, struct super_block *sb)
  64 {
  65         return nblocks(size, sb);
  66 }