[PATCH v1.1 13/17] mm/damon/sysfs: pass preps to DAMON core

[SJ Park]

DAMON sysfs interface provides the files for setting DAMON probe preps.
But the underlying code is not really passing the user-set values to
DAMON core.  Pass those.

Signed-off-by: SJ Park <sj@xxxxxxxxxx>
---
 mm/damon/sysfs.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c
index 1ecf194f71ddb..7ec14f48d157a 100644
--- a/mm/damon/sysfs.c
+++ b/mm/damon/sysfs.c
@@ -812,7 +812,10 @@ static ssize_t prep_action_store(struct kobject *kobj,
 
 		action_name = &damon_sysfs_prep_action_names[i];
 		if (sysfs_streq(buf, action_name->name)) {
+			if (!mutex_trylock(&damon_sysfs_lock))
+				return -EBUSY;
 			prep->action = action_name->action;
+			mutex_unlock(&damon_sysfs_lock);
 			ret = count;
 			break;
 		}
@@ -2176,6 +2179,23 @@ static int damon_sysfs_set_attrs(struct damon_ctx *ctx,
 	return damon_set_attrs(ctx, &attrs);
 }
 
+static int damon_sysfs_set_preps(struct damon_probe *probe,
+		struct damon_sysfs_preps *sys_preps)
+{
+	int i;
+
+	for (i = 0; i < sys_preps->nr; i++) {
+		struct damon_sysfs_prep *sys_prep = sys_preps->preps_arr[i];
+		struct damon_prep *prep;
+
+		prep = damon_new_prep(sys_prep->action);
+		if (!prep)
+			return -ENOMEM;
+		damon_add_prep(probe, prep);
+	}
+	return 0;
+}
+
 static int damon_sysfs_set_filters(struct damon_probe *probe,
 		struct damon_sysfs_filters *sys_filters)
 {
@@ -2211,7 +2231,15 @@ static int damon_sysfs_set_probe(struct damon_probe *probe,
 		struct damon_sysfs_probe *sys_probe)
 {
 	struct damon_sysfs_filters *sys_filters;
+	struct damon_sysfs_preps *sys_preps;
+	int err;
 
+	sys_preps = sys_probe->preps;
+	if (sys_preps) {
+		err = damon_sysfs_set_preps(probe, sys_preps);
+		if (err)
+			return err;
+	}
 	sys_filters = sys_probe->filters;
 	if (!sys_filters)
 		return 0;
-- 
2.47.3