From a596d08677320925b69e70c0fdc4c0f59384a65e Mon Sep 17 00:00:00 2001 From: Mariusz Dabrowski Date: Mon, 18 Feb 2019 15:04:09 +0100 Subject: raid5: set write hint for PPL 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: Guoqing Jiang Signed-off-by: Mariusz Dabrowski Signed-off-by: Song Liu --- drivers/md/raid5.c | 1 + 1 file changed, 1 insertion(+) (limited to 'drivers/md/raid5.c') diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index cecea901ab8c..09562d7cc080 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -6660,6 +6660,7 @@ static struct attribute *raid5_attrs[] = { &raid5_skip_copy.attr, &raid5_rmw_level.attr, &r5c_journal_mode.attr, + &ppl_write_hint.attr, NULL, }; static struct attribute_group raid5_attrs_group = { -- cgit