Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
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 | ||
9 | static inline unsigned long block_to_cpu(block_t n) | |
10 | { | |
11 | return n; | |
12 | } | |
13 | ||
14 | static inline block_t cpu_to_block(unsigned long n) | |
15 | { | |
16 | return n; | |
17 | } | |
18 | ||
19 | static inline block_t *i_data(struct inode *inode) | |
20 | { | |
21 | return (block_t *)minix_i(inode)->u.i2_data; | |
22 | } | |
23 | ||
0ab7620a EK |
24 | #define DIRCOUNT 7 |
25 | #define INDIRCOUNT(sb) (1 << ((sb)->s_blocksize_bits - 2)) | |
26 | ||
1da177e4 LT |
27 | static int block_to_path(struct inode * inode, long block, int offsets[DEPTH]) |
28 | { | |
29 | int n = 0; | |
939b00df | 30 | struct super_block *sb = inode->i_sb; |
1da177e4 LT |
31 | |
32 | if (block < 0) { | |
a1c6f057 DM |
33 | printk("MINIX-fs: block_to_path: block %ld < 0 on dev %pg\n", |
34 | block, sb->s_bdev); | |
f666f9fb EB |
35 | return 0; |
36 | } | |
37 | if ((u64)block * (u64)sb->s_blocksize >= sb->s_maxbytes) | |
38 | return 0; | |
39 | ||
40 | if (block < DIRCOUNT) { | |
1da177e4 | 41 | offsets[n++] = block; |
0ab7620a EK |
42 | } else if ((block -= DIRCOUNT) < INDIRCOUNT(sb)) { |
43 | offsets[n++] = DIRCOUNT; | |
1da177e4 | 44 | offsets[n++] = block; |
0ab7620a EK |
45 | } else if ((block -= INDIRCOUNT(sb)) < INDIRCOUNT(sb) * INDIRCOUNT(sb)) { |
46 | offsets[n++] = DIRCOUNT + 1; | |
47 | offsets[n++] = block / INDIRCOUNT(sb); | |
48 | offsets[n++] = block % INDIRCOUNT(sb); | |
1da177e4 | 49 | } else { |
0ab7620a EK |
50 | block -= INDIRCOUNT(sb) * INDIRCOUNT(sb); |
51 | offsets[n++] = DIRCOUNT + 2; | |
52 | offsets[n++] = (block / INDIRCOUNT(sb)) / INDIRCOUNT(sb); | |
53 | offsets[n++] = (block / INDIRCOUNT(sb)) % INDIRCOUNT(sb); | |
54 | offsets[n++] = block % INDIRCOUNT(sb); | |
1da177e4 LT |
55 | } |
56 | return n; | |
57 | } | |
58 | ||
59 | #include "itree_common.c" | |
60 | ||
61 | int V2_minix_get_block(struct inode * inode, long block, | |
62 | struct buffer_head *bh_result, int create) | |
63 | { | |
64 | return get_block(inode, block, bh_result, create); | |
65 | } | |
66 | ||
67 | void V2_minix_truncate(struct inode * inode) | |
68 | { | |
69 | truncate(inode); | |
70 | } | |
71 | ||
939b00df | 72 | unsigned V2_minix_blocks(loff_t size, struct super_block *sb) |
1da177e4 | 73 | { |
939b00df | 74 | return nblocks(size, sb); |
1da177e4 | 75 | } |