[RFC PATCH v2 3/9] mm/damon/core: support committing ops_filters

[SeongJae Park <sj@kernel.org>]

DAMON kernel API callers should use damon_commit_ctx() to install DAMON
parameters including DAMOS filters.  But damos_commit_ops_filters(),
which is called by damon_commit_ctx() for filters installing, is not
handling damos->ops_filters.  Hence, no DAMON kernel API caller can use
damos->ops_filters.  Do the committing of the ops_filters to make it
usable.

Signed-off-by: SeongJae Park <sj@kernel.org>
---
 mm/damon/core.c | 40 +++++++++++++++++++++++++++++++++++++++-
 1 file changed, 39 insertions(+), 1 deletion(-)

diff --git a/mm/damon/core.c b/mm/damon/core.c
index bcb7e42098dc..ffdd84ff6fa5 100644
--- a/mm/damon/core.c
+++ b/mm/damon/core.c
@@ -793,7 +793,7 @@ static void damos_commit_filter(
 	damos_commit_filter_arg(dst, src);
 }
 
-static int damos_commit_filters(struct damos *dst, struct damos *src)
+static int damos_commit_core_filters(struct damos *dst, struct damos *src)
 {
 	struct damos_filter *dst_filter, *next, *src_filter, *new_filter;
 	int i = 0, j = 0;
@@ -821,6 +821,44 @@ static int damos_commit_filters(struct damos *dst, struct damos *src)
 	return 0;
 }
 
+static int damos_commit_ops_filters(struct damos *dst, struct damos *src)
+{
+	struct damos_filter *dst_filter, *next, *src_filter, *new_filter;
+	int i = 0, j = 0;
+
+	damos_for_each_ops_filter_safe(dst_filter, next, dst) {
+		src_filter = damos_nth_filter(i++, src);
+		if (src_filter)
+			damos_commit_filter(dst_filter, src_filter);
+		else
+			damos_destroy_filter(dst_filter);
+	}
+
+	damos_for_each_ops_filter_safe(src_filter, next, src) {
+		if (j++ < i)
+			continue;
+
+		new_filter = damos_new_filter(
+				src_filter->type, src_filter->matching,
+				src_filter->allow);
+		if (!new_filter)
+			return -ENOMEM;
+		damos_commit_filter_arg(new_filter, src_filter);
+		damos_add_filter(dst, new_filter);
+	}
+	return 0;
+}
+
+static int damos_commit_filters(struct damos *dst, struct damos *src)
+{
+	int err;
+
+	err = damos_commit_core_filters(dst, src);
+	if (err)
+		return err;
+	return damos_commit_ops_filters(dst, src);
+}
+
 static struct damos *damon_nth_scheme(int n, struct damon_ctx *ctx)
 {
 	struct damos *s;
-- 
2.39.5