67 lines
1.3 KiB
C
67 lines
1.3 KiB
C
#include <linux/buffer_head.h>
|
|
#include "minix.h"
|
|
|
|
enum {DIRECT = 7, DEPTH = 4}; /* Have triple indirect */
|
|
|
|
typedef u32 block_t; /* 32 bit, host order */
|
|
|
|
static inline unsigned long block_to_cpu(block_t n)
|
|
{
|
|
return n;
|
|
}
|
|
|
|
static inline block_t cpu_to_block(unsigned long n)
|
|
{
|
|
return n;
|
|
}
|
|
|
|
static inline block_t *i_data(struct inode *inode)
|
|
{
|
|
return (block_t *)minix_i(inode)->u.i2_data;
|
|
}
|
|
|
|
static int block_to_path(struct inode * inode, long block, int offsets[DEPTH])
|
|
{
|
|
int n = 0;
|
|
|
|
if (block < 0) {
|
|
printk("minix_bmap: block<0");
|
|
} else if (block >= (minix_sb(inode->i_sb)->s_max_size/BLOCK_SIZE)) {
|
|
printk("minix_bmap: block>big");
|
|
} else if (block < 7) {
|
|
offsets[n++] = block;
|
|
} else if ((block -= 7) < 256) {
|
|
offsets[n++] = 7;
|
|
offsets[n++] = block;
|
|
} else if ((block -= 256) < 256*256) {
|
|
offsets[n++] = 8;
|
|
offsets[n++] = block>>8;
|
|
offsets[n++] = block & 255;
|
|
} else {
|
|
block -= 256*256;
|
|
offsets[n++] = 9;
|
|
offsets[n++] = block>>16;
|
|
offsets[n++] = (block>>8) & 255;
|
|
offsets[n++] = block & 255;
|
|
}
|
|
return n;
|
|
}
|
|
|
|
#include "itree_common.c"
|
|
|
|
int V2_minix_get_block(struct inode * inode, long block,
|
|
struct buffer_head *bh_result, int create)
|
|
{
|
|
return get_block(inode, block, bh_result, create);
|
|
}
|
|
|
|
void V2_minix_truncate(struct inode * inode)
|
|
{
|
|
truncate(inode);
|
|
}
|
|
|
|
unsigned V2_minix_blocks(loff_t size)
|
|
{
|
|
return nblocks(size);
|
|
}
|