Reapply "kernel: expose umount list to ioctl interface #2950"

This reverts commit 088996da9b.

kernel/supercalls.h

@@ -89,15 +89,26 @@ struct ksu_manage_mark_cmd {
     __u32 result; // Output: for get operation - mark status or reg_count
 };
 
-struct ksu_nuke_ext4_sysfs_cmd {
-    __aligned_u64 arg; // Input: mnt pointer
-};
-
 #define KSU_MARK_GET 1
 #define KSU_MARK_MARK 2
 #define KSU_MARK_UNMARK 3
 #define KSU_MARK_REFRESH 4
 
+struct ksu_nuke_ext4_sysfs_cmd {
+    __aligned_u64 arg; // Input: mnt pointer
+};
+
+struct ksu_add_try_umount_cmd {
+	__aligned_u64 arg; // char ptr, this is the mountpoint
+	__u32 flags; // this is the flag we use for it
+	__u8 mode; // denotes what to do with it 0:wipe_list 1:add_to_list 2:delete_entry
+};
+
+#define KSU_UMOUNT_WIPE 0  // ignore everything and wipe list
+#define KSU_UMOUNT_ADD 1   // add entry (path + flags)
+#define KSU_UMOUNT_DEL 2   // delete entry, strcmp
+
+
 // Other command structures
 struct ksu_get_full_version_cmd {
     char version_full[KSU_FULL_VERSION_STRING]; // Output: full version string
@@ -152,6 +163,7 @@ struct ksu_manual_su_cmd {
 #define KSU_IOCTL_GET_WRAPPER_FD _IOC(_IOC_WRITE, 'K', 15, 0)
 #define KSU_IOCTL_MANAGE_MARK _IOC(_IOC_READ|_IOC_WRITE, 'K', 16, 0)
 #define KSU_IOCTL_NUKE_EXT4_SYSFS _IOC(_IOC_WRITE, 'K', 17, 0)
+#define KSU_IOCTL_ADD_TRY_UMOUNT _IOC(_IOC_WRITE, 'K', 18, 0)
 // Other IOCTL command definitions
 #define KSU_IOCTL_GET_FULL_VERSION _IOC(_IOC_READ, 'K', 100, 0)
 #define KSU_IOCTL_HOOK_TYPE _IOC(_IOC_READ, 'K', 101, 0)