kernel: Implementing editable, removable mount points

kernel/umount_manager.h

@@ -0,0 +1,63 @@
+#ifndef __KSU_H_UMOUNT_MANAGER
+#define __KSU_H_UMOUNT_MANAGER
+
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+
+struct cred;
+
+enum umount_entry_state {
+    UMOUNT_STATE_IDLE = 0,
+    UMOUNT_STATE_ACTIVE = 1,
+    UMOUNT_STATE_BUSY = 2,
+};
+
+struct umount_entry {
+    struct list_head list;
+    char path[256];
+    int flags;
+    enum umount_entry_state state;
+    bool is_default;
+    u32 ref_count;
+};
+
+struct umount_manager {
+    struct list_head entry_list;
+    spinlock_t lock;
+    u32 entry_count;
+    u32 max_entries;
+};
+
+enum umount_manager_op {
+    UMOUNT_OP_ADD = 0,
+    UMOUNT_OP_REMOVE = 1,
+    UMOUNT_OP_LIST = 2,
+    UMOUNT_OP_CLEAR_CUSTOM = 3,
+};
+
+struct ksu_umount_manager_cmd {
+    __u32 operation;
+    char path[256];
+    __s32 flags;
+    __u32 count;
+    __aligned_u64 entries_ptr;
+};
+
+struct ksu_umount_entry_info {
+    char path[256];
+    __s32 flags;
+    __u8 is_default;
+    __u32 state;
+    __u32 ref_count;
+};
+
+int ksu_umount_manager_init(void);
+void ksu_umount_manager_exit(void);
+int ksu_umount_manager_add(const char *path, int flags, bool is_default);
+int ksu_umount_manager_remove(const char *path);
+void ksu_umount_manager_execute_all(const struct cred *cred);
+int ksu_umount_manager_get_entries(struct ksu_umount_entry_info __user *entries, u32 *count);
+int ksu_umount_manager_clear_custom(void);
+
+#endif // __KSU_H_UMOUNT_MANAGER