PRE
for_each_set_bit(segno, dirty_i->dirty_segmap[PRE], MAIN_SEGS(sbi))
unsigned long *prefree_map = dirty_i->dirty_segmap[PRE];
dirty_i->nr_dirty[PRE]--;
__remove_dirty_segment(sbi, new_segno, PRE);
__locate_dirty_segment(sbi, segno, PRE);
__locate_dirty_segment(sbi, segno, PRE);
return DIRTY_I(sbi)->nr_dirty[PRE];