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mm/damon/sysfs-schemes: return error when for attempts to install filters on wrong sysfs directory

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Return error if the user tries to install a DAMOS filter on DAMOS filters
sysfs directory that assumed to be used for filters that handled by a
DAMON layer that not same to that for the installing filter.

Link: https://lkml.kernel.org/r/20250305222733.59089-7-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>
This commit is contained in:
SeongJae Park 2025-03-05 14:27:31 -08:00 committed by Andrew Morton
parent 9f643a9854
commit ae8fd5b666
1 changed files with 20 additions and 0 deletions
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20
mm/damon/sysfs-schemes.c
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@ -362,6 +362,23 @@ static ssize_t type_show(struct kobject *kobj,
damon_sysfs_scheme_filter_type_strs[filter->type]);
}
static bool damos_sysfs_scheme_filter_valid_type(
enum damos_sysfs_filter_handle_layer layer,
enum damos_filter_type type)
{
switch (layer) {
case DAMOS_SYSFS_FILTER_HANDLE_LAYER_BOTH:
return true;
case DAMOS_SYSFS_FILTER_HANDLE_LAYER_CORE:
return !damos_filter_for_ops(type);
case DAMOS_SYSFS_FILTER_HANDLE_LAYER_OPS:
return damos_filter_for_ops(type);
default:
break;
}
return false;
}
static ssize_t type_store(struct kobject *kobj,
struct kobj_attribute *attr, const char *buf, size_t count)
{
@ -373,6 +390,9 @@ static ssize_t type_store(struct kobject *kobj,
for (type = 0; type < NR_DAMOS_FILTER_TYPES; type++) {
if (sysfs_streq(buf, damon_sysfs_scheme_filter_type_strs[
type])) {
if (!damos_sysfs_scheme_filter_valid_type(
filter->handle_layer, type))
break;
filter->type = type;
ret = count;
break;