null_free_sector  960 drivers/block/null_blk_main.c 			null_free_sector(nullb, sector, true);
null_free_sector 1007 drivers/block/null_blk_main.c 		null_free_sector(nullb, sector, false);
null_free_sector 1009 drivers/block/null_blk_main.c 			null_free_sector(nullb, sector, true);