int minix_bmap(struct inode * inode,int block)
{
int i;
if (block<0) {
printk("minix_bmap: block<0");
return 0;
}
if (block >= 7+512+512*512) {
printk("minix_bmap: block>big");
return 0;
}
if (block < 7)
return inode_bmap(inode,block);
block -= 7;
if (block < 512) {
i = inode_bmap(inode,7);
if (!i)
return 0;
return block_bmap(bread(inode->i_dev,i,BLOCK_SIZE),block);
}
block -= 512;
i = inode_bmap(inode,8);
if (!i)
return 0;
i = block_bmap(bread(inode->i_dev,i,BLOCK_SIZE),block>>9);
if (!i)
return 0;
return block_bmap(bread(inode->i_dev,i,BLOCK_SIZE),block & 511);
}
int sysv_bmap(struct inode * inode,int block_nr)
{
unsigned int block = block_nr;
struct super_block * sb = inode->i_sb;
int convert;
int i;
struct buffer_head * bh;
if (block < 10)
return inode_bmap(sb,inode,block);
block -= 10;
convert = sb->sv_convert;
if (block < IND_PER_BLOCK) {
i = inode_bmap(sb,inode,10);
if (!i)
return 0;
bh = bread(inode->i_dev,i,BLOCK_SIZE);
return block_bmap(sb,bh,block,convert);
}
block -= IND_PER_BLOCK;
if (block < IND_PER_BLOCK*IND_PER_BLOCK) {
i = inode_bmap(sb,inode,11);
if (!i)
return 0;
bh = bread(inode->i_dev,i,BLOCK_SIZE);
i = block_bmap(sb,bh,block/IND_PER_BLOCK,convert);
if (!i)
return 0;
bh = bread(inode->i_dev,i,BLOCK_SIZE);
return block_bmap(sb,bh,block%IND_PER_BLOCK,convert);
}
block -= IND_PER_BLOCK*IND_PER_BLOCK;
if (block < IND_PER_BLOCK*IND_PER_BLOCK*IND_PER_BLOCK) {
i = inode_bmap(sb,inode,12);
if (!i)
return 0;
bh = bread(inode->i_dev,i,BLOCK_SIZE);
i = block_bmap(sb,bh,block/(IND_PER_BLOCK*IND_PER_BLOCK),convert);
if (!i)
return 0;
bh = bread(inode->i_dev,i,BLOCK_SIZE);
i = block_bmap(sb,bh,(block/IND_PER_BLOCK)%IND_PER_BLOCK,convert);
if (!i)
return 0;
bh = bread(inode->i_dev,i,BLOCK_SIZE);
return block_bmap(sb,bh,block%IND_PER_BLOCK,convert);
}
if ((int)block<0) {
printk("sysv_bmap: block<0");
return 0;
}
printk("sysv_bmap: block>big");
return 0;
}