f2fs_get_next_page_offset
*next_pgofs = f2fs_get_next_page_offset(&dn, index);
*map->m_next_pgofs = f2fs_get_next_page_offset(dn, pgoff);
*map->m_next_extent = f2fs_get_next_page_offset(dn, pgoff);
pgoff_t f2fs_get_next_page_offset(struct dnode_of_data *dn, pgoff_t pgofs);
pg_start = f2fs_get_next_page_offset(&dn,
page_idx = f2fs_get_next_page_offset(&dn,
page_idx = f2fs_get_next_page_offset(&dn,
index = f2fs_get_next_page_offset(&dn, index);
pgofs = f2fs_get_next_page_offset(&dn, pgofs);