blob: 9adcdc754e0fc2da58b7496b472789d41a910445 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001#include <linux/buffer_head.h>
2#include "minix.h"
3
4enum {DIRECT = 7, DEPTH = 4}; /* Have triple indirect */
5
6typedef u32 block_t; /* 32 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.i2_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) {
Denis Vlasenko11b84482006-03-25 03:07:42 -080028 printk("minix_bmap: block<0\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -070029 } else if (block >= (minix_sb(inode->i_sb)->s_max_size/BLOCK_SIZE)) {
Denis Vlasenko11b84482006-03-25 03:07:42 -080030 printk("minix_bmap: block>big\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -070031 } else if (block < 7) {
32 offsets[n++] = block;
33 } else if ((block -= 7) < 256) {
34 offsets[n++] = 7;
35 offsets[n++] = block;
36 } else if ((block -= 256) < 256*256) {
37 offsets[n++] = 8;
38 offsets[n++] = block>>8;
39 offsets[n++] = block & 255;
40 } else {
41 block -= 256*256;
42 offsets[n++] = 9;
43 offsets[n++] = block>>16;
44 offsets[n++] = (block>>8) & 255;
45 offsets[n++] = block & 255;
46 }
47 return n;
48}
49
50#include "itree_common.c"
51
52int V2_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
58void V2_minix_truncate(struct inode * inode)
59{
60 truncate(inode);
61}
62
63unsigned V2_minix_blocks(loff_t size)
64{
65 return nblocks(size);
66}