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-rw-r--r--fs/ext4/super.c18
1 files changed, 17 insertions, 1 deletions
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index ff889e1..2766b8e 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -2754,9 +2754,25 @@ static void ext4_feat_release(struct kobject *kobj)
complete(&ext4_feat->f_kobj_unregister);
}
+static ssize_t ext4_feat_show(struct kobject *kobj,
+ struct attribute *attr, char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, "supported\n");
+}
+
+/*
+ * We can not use ext4_attr_show/store because it relies on the kobject
+ * being embedded in the ext4_sb_info structure which is definitely not
+ * true in this case.
+ */
+static const struct sysfs_ops ext4_feat_ops = {
+ .show = ext4_feat_show,
+ .store = NULL,
+};
+
static struct kobj_type ext4_feat_ktype = {
.default_attrs = ext4_feat_attrs,
- .sysfs_ops = &ext4_attr_ops,
+ .sysfs_ops = &ext4_feat_ops,
.release = ext4_feat_release,
};
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