root/fs/minix/itree_v2.c

DEFINITIONS

1. block_to_cpu
2. cpu_to_block
3. i_data
4. block_to_path
5. V2_minix_get_block
6. V2_minix_truncate
7. V2_minix_blocks

#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;
        char b[BDEVNAME_SIZE];
        struct super_block *sb = inode->i_sb;

        if (block < 0) {
                printk("MINIX-fs: block_to_path: block %ld < 0 on dev %s\n",
                        block, bdevname(sb->s_bdev, b));
        } else if (block >= (minix_sb(inode->i_sb)->s_max_size/sb->s_blocksize)) {
                if (printk_ratelimit())
                        printk("MINIX-fs: block_to_path: "
                               "block %ld too big on dev %s\n",
                                block, bdevname(sb->s_bdev, b));
        } 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, struct super_block *sb)
{
        return nblocks(size, sb);
}