itree_v2.c
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#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\n");
} else if (block >= (minix_sb(inode->i_sb)->s_max_size/BLOCK_SIZE)) {
printk("minix_bmap: block>big\n");
} 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);
}