add_chain
ioc->add_chain = &mpt_add_chain_64bit;
ioc->add_chain = &mpt_add_chain;
ioc->add_chain = &mpt_add_chain_64bit;
ioc->add_chain = &mpt_add_chain;
MPT_ADD_CHAIN add_chain; /* Pointer to add_chain
ioc->add_chain((char *)chainSge, 0, sgeOffset,
ioc->add_chain((char *)chainSge, nextChain, sgeOffset,
add_chain (chain, NULL, EXT2_I(inode)->i_data + *offsets);
add_chain(++p, bh, (__le32*)bh->b_data + *++offsets);
add_chain(chain, NULL, EXT4_I(inode)->i_data + *offsets);
add_chain(++p, bh, (__le32 *)bh->b_data + *++offsets);
add_chain (chain, NULL, i_data(inode) + *offsets);
add_chain(++p, bh, (block_t *)bh->b_data + *++offsets);