tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#include <linux/buffer_head.h>
2#include "minix.h"
3
4enum {DEPTH = 3, DIRECT = 7}; /* Only double indirect */
5
6typedef u16 block_t; /* 16 bit, host order */
7
8static inline unsigned long block_to_cpu(block_t n)
9{
10 return n;
11}
12
13static inline block_t cpu_to_block(unsigned long n)
14{
15 return n;
16}
17
18static inline block_t *i_data(struct inode *inode)
19{
20 return (block_t *)minix_i(inode)->u.i1_data;
21}
22
23static int block_to_path(struct inode * inode, long block, int offsets[DEPTH])
24{
25 int n = 0;
26
27 if (block < 0) {
28 printk("minix_bmap: block<0");
29 } else if (block >= (minix_sb(inode->i_sb)->s_max_size/BLOCK_SIZE)) {
30 printk("minix_bmap: block>big");
31 } else if (block < 7) {
32 offsets[n++] = block;
33 } else if ((block -= 7) < 512) {
34 offsets[n++] = 7;
35 offsets[n++] = block;
36 } else {
37 block -= 512;
38 offsets[n++] = 8;
39 offsets[n++] = block>>9;
40 offsets[n++] = block & 511;
41 }
42 return n;
43}
44
45#include "itree_common.c"
46
47int V1_minix_get_block(struct inode * inode, long block,
48 struct buffer_head *bh_result, int create)
49{
50 return get_block(inode, block, bh_result, create);
51}
52
53void V1_minix_truncate(struct inode * inode)
54{
55 truncate(inode);
56}
57
58unsigned V1_minix_blocks(loff_t size)
59{
60 return nblocks(size);
61}