Linux Kernel  3.7.1
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itree_v1.c
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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 }