mm/damon/sysfs-schemes: implement core_filters and ops_filters directories

Implement two DAMOS sysfs directories for managing core and operations
layer handled filters separately.  Those are named as 'core_filters' and
'ops_filters', and have files hierarchy same to 'filters'.  This commit is
only populating and cleaning up the directories, not really connecting the
files with DAMON.  Following changes will make the connections.

Link: https://lkml.kernel.org/r/20250305222733.59089-3-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/damon/sysfs-schemes.c b/mm/damon/sysfs-schemes.c
index d769b24..30a7f28 100644 (file)
--- a/mm/damon/sysfs-schemes.c
+++ b/mm/damon/sysfs-schemes.c
@@ -1504,6 +1504,8 @@ struct damon_sysfs_scheme {
        unsigned long apply_interval_us;
        struct damon_sysfs_quotas *quotas;
        struct damon_sysfs_watermarks *watermarks;
+       struct damon_sysfs_scheme_filters *core_filters;
+       struct damon_sysfs_scheme_filters *ops_filters;
        struct damon_sysfs_scheme_filters *filters;
        struct damon_sysfs_stats *stats;
        struct damon_sysfs_scheme_regions *tried_regions;
@@ -1624,6 +1626,33 @@ static int damon_sysfs_scheme_set_filters(struct damon_sysfs_scheme *scheme,
        return err;
 }
 
+static int damos_sysfs_set_filter_dirs(struct damon_sysfs_scheme *scheme)
+{
+       int err;
+
+       err = damon_sysfs_scheme_set_filters(scheme, "filters",
+                       &scheme->filters);
+       if (err)
+               return err;
+       err = damon_sysfs_scheme_set_filters(scheme, "core_filters",
+                       &scheme->core_filters);
+       if (err)
+               goto put_filters_out;
+       err = damon_sysfs_scheme_set_filters(scheme, "ops_filters",
+                       &scheme->ops_filters);
+       if (err)
+               goto put_core_filters_out;
+       return 0;
+
+put_core_filters_out:
+       kobject_put(&scheme->core_filters->kobj);
+       scheme->core_filters = NULL;
+put_filters_out:
+       kobject_put(&scheme->filters->kobj);
+       scheme->filters = NULL;
+       return err;
+}
+
 static int damon_sysfs_scheme_set_stats(struct damon_sysfs_scheme *scheme)
 {
        struct damon_sysfs_stats *stats = damon_sysfs_stats_alloc();
@@ -1672,8 +1701,7 @@ static int damon_sysfs_scheme_add_dirs(struct damon_sysfs_scheme *scheme)
        err = damon_sysfs_scheme_set_watermarks(scheme);
        if (err)
                goto put_quotas_access_pattern_out;
-       err = damon_sysfs_scheme_set_filters(scheme, "filters",
-                       &scheme->filters);
+       err = damos_sysfs_set_filter_dirs(scheme);
        if (err)
                goto put_watermarks_quotas_access_pattern_out;
        err = damon_sysfs_scheme_set_stats(scheme);
@@ -1688,6 +1716,10 @@ put_tried_regions_out:
        kobject_put(&scheme->tried_regions->kobj);
        scheme->tried_regions = NULL;
 put_filters_watermarks_quotas_access_pattern_out:
+       kobject_put(&scheme->ops_filters->kobj);
+       scheme->ops_filters = NULL;
+       kobject_put(&scheme->core_filters->kobj);
+       scheme->core_filters = NULL;
        kobject_put(&scheme->filters->kobj);
        scheme->filters = NULL;
 put_watermarks_quotas_access_pattern_out:
@@ -1711,6 +1743,10 @@ static void damon_sysfs_scheme_rm_dirs(struct damon_sysfs_scheme *scheme)
        kobject_put(&scheme->watermarks->kobj);
        damon_sysfs_scheme_filters_rm_dirs(scheme->filters);
        kobject_put(&scheme->filters->kobj);
+       damon_sysfs_scheme_filters_rm_dirs(scheme->core_filters);
+       kobject_put(&scheme->core_filters->kobj);
+       damon_sysfs_scheme_filters_rm_dirs(scheme->ops_filters);
+       kobject_put(&scheme->ops_filters->kobj);
        kobject_put(&scheme->stats->kobj);
        damon_sysfs_scheme_regions_rm_dirs(scheme->tried_regions);
        kobject_put(&scheme->tried_regions->kobj);