1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/buffer_head.h>
3 #include <linux/slab.h>
4 #include "minix.h"
5
6 enum {DEPTH = 3, DIRECT = 7}; /* Only double indirect */
7
8 typedef u16 block_t; /* 16 bit, host order */
9
10 static inline unsigned long block_to_cpu(block_t n)
11 {
12 return n;
13 }
14
15 static inline block_t cpu_to_block(unsigned long n)
16 {
17 return n;
18 }
19
20 static inline block_t *i_data(struct inode *inode)
21 {
22 return (block_t *)minix_i(inode)->u.i1_data;
23 }
24
25 static int block_to_path(struct inode * inode, long block, int offsets[DEPTH])
26 {
27 int n = 0;
28
29 if (block < 0) {
30 printk("MINIX-fs: block_to_path: block %ld < 0 on dev %pg\n",
31 block, inode->i_sb->s_bdev);
32 return 0;
33 }
34 if ((u64)block * BLOCK_SIZE >= inode->i_sb->s_maxbytes)
35 return 0;
36
37 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 }
68
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