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         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
  53 int 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
  59 void V1_minix_truncate(struct inode * inode)
  60 {
  61         truncate(inode);
  62 }
  63
  64 unsigned V1_minix_blocks(loff_t size, struct super_block *sb)
  65 {
  66         return nblocks(size, sb);
  67 }