1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/buffer_head.h>
3 #include "minix.h"
4
5 enum {DIRECT = 7, DEPTH = 4}; /* Have triple indirect */
6
7 typedef u32 block_t; /* 32 bit, host order */
8
block_to_cpu(block_t n)9 static inline unsigned long block_to_cpu(block_t n)
10 {
11 return n;
12 }
13
cpu_to_block(unsigned long n)14 static inline block_t cpu_to_block(unsigned long n)
15 {
16 return n;
17 }
18
i_data(struct inode * inode)19 static inline block_t *i_data(struct inode *inode)
20 {
21 return (block_t *)minix_i(inode)->u.i2_data;
22 }
23
24 #define DIRCOUNT 7
25 #define INDIRCOUNT(sb) (1 << ((sb)->s_blocksize_bits - 2))
26
block_to_path(struct inode * inode,long block,int offsets[DEPTH])27 static int block_to_path(struct inode * inode, long block, int offsets[DEPTH])
28 {
29 int n = 0;
30 struct super_block *sb = inode->i_sb;
31
32 if (block < 0) {
33 printk("MINIX-fs: block_to_path: block %ld < 0 on dev %pg\n",
34 block, sb->s_bdev);
35 } else if ((u64)block * (u64)sb->s_blocksize >=
36 minix_sb(sb)->s_max_size) {
37 if (printk_ratelimit())
38 printk("MINIX-fs: block_to_path: "
39 "block %ld too big on dev %pg\n",
40 block, sb->s_bdev);
41 } else if (block < DIRCOUNT) {
42 offsets[n++] = block;
43 } else if ((block -= DIRCOUNT) < INDIRCOUNT(sb)) {
44 offsets[n++] = DIRCOUNT;
45 offsets[n++] = block;
46 } else if ((block -= INDIRCOUNT(sb)) < INDIRCOUNT(sb) * INDIRCOUNT(sb)) {
47 offsets[n++] = DIRCOUNT + 1;
48 offsets[n++] = block / INDIRCOUNT(sb);
49 offsets[n++] = block % INDIRCOUNT(sb);
50 } else {
51 block -= INDIRCOUNT(sb) * INDIRCOUNT(sb);
52 offsets[n++] = DIRCOUNT + 2;
53 offsets[n++] = (block / INDIRCOUNT(sb)) / INDIRCOUNT(sb);
54 offsets[n++] = (block / INDIRCOUNT(sb)) % INDIRCOUNT(sb);
55 offsets[n++] = block % INDIRCOUNT(sb);
56 }
57 return n;
58 }
59
60 #include "itree_common.c"
61
V2_minix_get_block(struct inode * inode,long block,struct buffer_head * bh_result,int create)62 int V2_minix_get_block(struct inode * inode, long block,
63 struct buffer_head *bh_result, int create)
64 {
65 return get_block(inode, block, bh_result, create);
66 }
67
V2_minix_truncate(struct inode * inode)68 void V2_minix_truncate(struct inode * inode)
69 {
70 truncate(inode);
71 }
72
V2_minix_blocks(loff_t size,struct super_block * sb)73 unsigned V2_minix_blocks(loff_t size, struct super_block *sb)
74 {
75 return nblocks(size, sb);
76 }
77