Commit | Line | Data |
---|---|---|
b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 | 2 | #include <linux/buffer_head.h> |
5a0e3ad6 | 3 | #include <linux/slab.h> |
1da177e4 LT |
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) { | |
a1c6f057 DM |
30 | printk("MINIX-fs: block_to_path: block %ld < 0 on dev %pg\n", |
31 | block, inode->i_sb->s_bdev); | |
f666f9fb EB |
32 | return 0; |
33 | } | |
34 | if ((u64)block * BLOCK_SIZE >= inode->i_sb->s_maxbytes) | |
35 | return 0; | |
36 | ||
37 | if (block < 7) { | |
1da177e4 LT |
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 | ||
939b00df | 64 | unsigned V1_minix_blocks(loff_t size, struct super_block *sb) |
1da177e4 | 65 | { |
939b00df | 66 | return nblocks(size, sb); |
1da177e4 | 67 | } |