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 {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 char b[BDEVNAME_SIZE];
27 struct super_block *sb = inode->i_sb;
28
29 if (block < 0) {
30 printk("MINIX-fs: block_to_path: block %ld < 0 on dev %s\n",
31 block, bdevname(sb->s_bdev, b));
32 } else if (block >= (minix_sb(inode->i_sb)->s_max_size/sb->s_blocksize)) {
33 if (printk_ratelimit())
34 printk("MINIX-fs: block_to_path: "
35 "block %ld too big on dev %s\n",
36 block, bdevname(sb->s_bdev, b));
37 } else if (block < 7) {
38 offsets[n++] = block;
39 } else if ((block -= 7) < 256) {
40 offsets[n++] = 7;
41 offsets[n++] = block;
42 } else if ((block -= 256) < 256*256) {
43 offsets[n++] = 8;
44 offsets[n++] = block>>8;
45 offsets[n++] = block & 255;
46 } else {
47 block -= 256*256;
48 offsets[n++] = 9;
49 offsets[n++] = block>>16;
50 offsets[n++] = (block>>8) & 255;
51 offsets[n++] = block & 255;
52 }
53 return n;
54}
55
56#include "itree_common.c"
57
58int V2_minix_get_block(struct inode * inode, long block,
59 struct buffer_head *bh_result, int create)
60{
61 return get_block(inode, block, bh_result, create);
62}
63
64void V2_minix_truncate(struct inode * inode)
65{
66 truncate(inode);
67}
68
69unsigned V2_minix_blocks(loff_t size, struct super_block *sb)
70{
71 return nblocks(size, sb);
72}