Merge git://git.infradead.org/mtd-2.6
[linux-2.6] / fs / minix / itree_v1.c
1 #include <linux/buffer_head.h>
2 #include "minix.h"
3
4 enum {DEPTH = 3, DIRECT = 7};   /* Only double indirect */
5
6 typedef u16 block_t;    /* 16 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.i1_data;
21 }
22
23 static int block_to_path(struct inode * inode, long block, int offsets[DEPTH])
24 {
25         int n = 0;
26         char b[BDEVNAME_SIZE];
27
28         if (block < 0) {
29                 printk("MINIX-fs: block_to_path: block %ld < 0 on dev %s\n",
30                         block, bdevname(inode->i_sb->s_bdev, b));
31         } else if (block >= (minix_sb(inode->i_sb)->s_max_size/BLOCK_SIZE)) {
32                 if (printk_ratelimit())
33                         printk("MINIX-fs: block_to_path: "
34                                "block %ld too big on dev %s\n",
35                                 block, bdevname(inode->i_sb->s_bdev, b));
36         } else if (block < 7) {
37                 offsets[n++] = block;
38         } else if ((block -= 7) < 512) {
39                 offsets[n++] = 7;
40                 offsets[n++] = block;
41         } else {
42                 block -= 512;
43                 offsets[n++] = 8;
44                 offsets[n++] = block>>9;
45                 offsets[n++] = block & 511;
46         }
47         return n;
48 }
49
50 #include "itree_common.c"
51
52 int V1_minix_get_block(struct inode * inode, long block,
53                         struct buffer_head *bh_result, int create)
54 {
55         return get_block(inode, block, bh_result, create);
56 }
57
58 void V1_minix_truncate(struct inode * inode)
59 {
60         truncate(inode);
61 }
62
63 unsigned V1_minix_blocks(loff_t size, struct super_block *sb)
64 {
65         return nblocks(size, sb);
66 }