hfs_get_block
extern int hfs_get_block(struct inode *inode, sector_t block,
ret = blockdev_direct_IO(iocb, inode, iter, hfs_get_block);
return mpage_writepages(mapping, wbc, hfs_get_block);
return block_read_full_folio(folio, hfs_get_block);
hfs_get_block,
return generic_block_bmap(mapping, block, hfs_get_block);