aboutsummaryrefslogtreecommitdiffstats
path: root/fs/minix/itree_v2.c
blob: 3adc7675560f2e11615a3807b65e2fea20eca5e5 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
#include <linux/buffer_head.h>
#include "minix.h"

enum {DIRECT = 7, DEPTH = 4};	/* Have triple indirect */

typedef u32 block_t;	/* 32 bit, host order */

static inline unsigned long block_to_cpu(block_t n)
{
	return n;
}

static inline block_t cpu_to_block(unsigned long n)
{
	return n;
}

static inline block_t *i_data(struct inode *inode)
{
	return (block_t *)minix_i(inode)->u.i2_data;
}

static int block_to_path(struct inode * inode, long block, int offsets[DEPTH])
{
	int n = 0;

	if (block < 0) {
		printk("minix_bmap: block<0");
	} else if (block >= (minix_sb(inode->i_sb)->s_max_size/BLOCK_SIZE)) {
		printk("minix_bmap: block>big");
	} else if (block < 7) {
		offsets[n++] = block;
	} else if ((block -= 7) < 256) {
		offsets[n++] = 7;
		offsets[n++] = block;
	} else if ((block -= 256) < 256*256) {
		offsets[n++] = 8;
		offsets[n++] = block>>8;
		offsets[n++] = block & 255;
	} else {
		block -= 256*256;
		offsets[n++] = 9;
		offsets[n++] = block>>16;
		offsets[n++] = (block>>8) & 255;
		offsets[n++] = block & 255;
	}
	return n;
}

#include "itree_common.c"

int V2_minix_get_block(struct inode * inode, long block,
			struct buffer_head *bh_result, int create)
{
	return get_block(inode, block, bh_result, create);
}

void V2_minix_truncate(struct inode * inode)
{
	truncate(inode);
}

unsigned V2_minix_blocks(loff_t size)
{
	return nblocks(size);
}