[RFC PATCH 3/7] mm/damon/sysfs-schemes: support quota goal complement flag

[SJ Park]

Add a new sysfs file, complement, under the quota goal directory.  It
works for setting and getting the quota goal metric complement flag
value.

Signed-off-by: SJ Park <sj@xxxxxxxxxx>
---
 mm/damon/sysfs-schemes.c | 32 +++++++++++++++++++++++++++++++-
 1 file changed, 31 insertions(+), 1 deletion(-)

diff --git a/mm/damon/sysfs-schemes.c b/mm/damon/sysfs-schemes.c
index 06af417bc9a2f..8f083611741fd 100644
--- a/mm/damon/sysfs-schemes.c
+++ b/mm/damon/sysfs-schemes.c
@@ -1220,6 +1220,7 @@ static const struct kobj_type damon_sysfs_watermarks_ktype = {
 struct damos_sysfs_quota_goal {
 	struct kobject kobj;
 	enum damos_quota_goal_metric metric;
+	bool complement;
 	unsigned long target_value;
 	unsigned long current_value;
 	int nid;
@@ -1316,6 +1317,30 @@ static ssize_t target_metric_store(struct kobject *kobj,
 	return -EINVAL;
 }
 
+static ssize_t complement_show(struct kobject *kobj,
+		struct kobj_attribute *attr, char *buf)
+{
+	struct damos_sysfs_quota_goal *goal = container_of(kobj,
+			struct damos_sysfs_quota_goal, kobj);
+
+	return sysfs_emit(buf, "%c\n", goal->complement ? 'Y' : 'N');
+}
+
+static ssize_t complement_store(struct kobject *kobj,
+		struct kobj_attribute *attr, const char *buf, size_t count)
+{
+	struct damos_sysfs_quota_goal *goal = container_of(kobj,
+			struct damos_sysfs_quota_goal, kobj);
+	bool complement;
+	int err = kstrtobool(buf, &complement);
+
+	if (err)
+		return err;
+
+	goal->complement = complement;
+	return count;
+}
+
 static ssize_t target_value_show(struct kobject *kobj,
 		struct kobj_attribute *attr, char *buf)
 {
@@ -1424,6 +1449,9 @@ static void damos_sysfs_quota_goal_release(struct kobject *kobj)
 static struct kobj_attribute damos_sysfs_quota_goal_target_metric_attr =
 		__ATTR_RW_MODE(target_metric, 0600);
 
+static struct kobj_attribute damos_sysfs_quota_goal_complement_attr =
+		__ATTR_RW_MODE(complement, 0600);
+
 static struct kobj_attribute damos_sysfs_quota_goal_target_value_attr =
 		__ATTR_RW_MODE(target_value, 0600);
 
@@ -1438,6 +1466,7 @@ static struct kobj_attribute damos_sysfs_quota_goal_path_attr =
 
 static struct attribute *damos_sysfs_quota_goal_attrs[] = {
 	&damos_sysfs_quota_goal_target_metric_attr.attr,
+	&damos_sysfs_quota_goal_complement_attr.attr,
 	&damos_sysfs_quota_goal_target_value_attr.attr,
 	&damos_sysfs_quota_goal_current_value_attr.attr,
 	&damos_sysfs_quota_goal_nid_attr.attr,
@@ -2869,7 +2898,8 @@ static int damos_sysfs_add_quota_score(
 		if (!sysfs_goal->target_value)
 			continue;
 
-		goal = damos_new_quota_goal(sysfs_goal->metric, false,
+		goal = damos_new_quota_goal(sysfs_goal->metric,
+				sysfs_goal->complement,
 				sysfs_goal->target_value);
 		if (!goal)
 			return -ENOMEM;
-- 
2.47.3