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Commit | Line | Data |
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1da177e4 LT |
1 | #include <linux/buffer_head.h> |
2 | #include "minix.h" | |
3 | ||
4 | enum {DIRECT = 7, DEPTH = 4}; /* Have triple indirect */ | |
5 | ||
6 | typedef u32 block_t; /* 32 bit, host order */ | |
7 | ||
8 | static inline unsigned long block_to_cpu(block_t n) | |
9 | { | |
10 | return n; | |
11 | } | |
12 | ||
13 | static inline block_t cpu_to_block(unsigned long n) | |
14 | { | |
15 | return n; | |
16 | } | |
17 | ||
18 | static inline block_t *i_data(struct inode *inode) | |
19 | { | |
20 | return (block_t *)minix_i(inode)->u.i2_data; | |
21 | } | |
22 | ||
23 | static int block_to_path(struct inode * inode, long block, int offsets[DEPTH]) | |
24 | { | |
25 | int n = 0; | |
939b00df | 26 | struct super_block *sb = inode->i_sb; |
1da177e4 LT |
27 | |
28 | if (block < 0) { | |
11b84487 | 29 | printk("minix_bmap: block<0\n"); |
939b00df | 30 | } else if (block >= (minix_sb(inode->i_sb)->s_max_size/sb->s_blocksize)) { |
11b84487 | 31 | printk("minix_bmap: block>big\n"); |
1da177e4 LT |
32 | } else if (block < 7) { |
33 | offsets[n++] = block; | |
34 | } else if ((block -= 7) < 256) { | |
35 | offsets[n++] = 7; | |
36 | offsets[n++] = block; | |
37 | } else if ((block -= 256) < 256*256) { | |
38 | offsets[n++] = 8; | |
39 | offsets[n++] = block>>8; | |
40 | offsets[n++] = block & 255; | |
41 | } else { | |
42 | block -= 256*256; | |
43 | offsets[n++] = 9; | |
44 | offsets[n++] = block>>16; | |
45 | offsets[n++] = (block>>8) & 255; | |
46 | offsets[n++] = block & 255; | |
47 | } | |
48 | return n; | |
49 | } | |
50 | ||
51 | #include "itree_common.c" | |
52 | ||
53 | int V2_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 V2_minix_truncate(struct inode * inode) | |
60 | { | |
61 | truncate(inode); | |
62 | } | |
63 | ||
939b00df | 64 | unsigned V2_minix_blocks(loff_t size, struct super_block *sb) |
1da177e4 | 65 | { |
939b00df | 66 | return nblocks(size, sb); |
1da177e4 | 67 | } |