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raid5: set write hint for PPL

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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 <gqjiang@suse.com>
Signed-off-by: Mariusz Dabrowski <mariusz.dabrowski@intel.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
This commit is contained in:
Mariusz Dabrowski
2019-02-18 15:04:09 +01:00
committed by Song Liu
parent 9205e44916
commit a596d08677
4 changed files with 68 additions and 0 deletions
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drivers/md/raid5.c
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@@ -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 = {