When the Partial Parity Log is enabled, circular buffer is used to store
PPL data. Each write to RAID device causes overwrite of data in this buffer
so some write_hint can be set to those request to help drives handle
garbage collection. This patch adds new sysfs attribute which can be used
to specify which write_hint should be assigned to PPL.
Acked-by: NGuoqing Jiang <gqjiang@suse.com>
Signed-off-by: NMariusz Dabrowski <mariusz.dabrowski@intel.com>
Signed-off-by: NSong Liu <songliubraving@fb.com>