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
block_to_cpu(block_t n)8 static inline unsigned long block_to_cpu(block_t n)
9 {
10 return n;
11 }
12
cpu_to_block(unsigned long n)13 static inline block_t cpu_to_block(unsigned long n)
14 {
15 return n;
16 }
17
i_data(struct inode * inode)18 static inline block_t *i_data(struct inode *inode)
19 {
20 return (block_t *)minix_i(inode)->u.i2_data;
21 }
22
23 #define DIRCOUNT 7
24 #define INDIRCOUNT(sb) (1 << ((sb)->s_blocksize_bits - 2))
25
block_to_path(struct inode * inode,long block,int offsets[DEPTH])26 static int block_to_path(struct inode * inode, long block, int offsets[DEPTH])
27 {
28 int n = 0;
29 char b[BDEVNAME_SIZE];
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 %s\n",
34 block, bdevname(sb->s_bdev, b));
35 } else if (block >= (minix_sb(inode->i_sb)->s_max_size/sb->s_blocksize)) {
36 if (printk_ratelimit())
37 printk("MINIX-fs: block_to_path: "
38 "block %ld too big on dev %s\n",
39 block, bdevname(sb->s_bdev, b));
40 } else if (block < DIRCOUNT) {
41 offsets[n++] = block;
42 } else if ((block -= DIRCOUNT) < INDIRCOUNT(sb)) {
43 offsets[n++] = DIRCOUNT;
44 offsets[n++] = block;
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);
49 } else {
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);
55 }
56 return n;
57 }
58
59 #include "itree_common.c"
60
V2_minix_get_block(struct inode * inode,long block,struct buffer_head * bh_result,int create)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
V2_minix_truncate(struct inode * inode)67 void V2_minix_truncate(struct inode * inode)
68 {
69 truncate(inode);
70 }
71
V2_minix_blocks(loff_t size,struct super_block * sb)72 unsigned V2_minix_blocks(loff_t size, struct super_block *sb)
73 {
74 return nblocks(size, sb);
75 }
76