diff --git a/fs_mgr/fs_mgr.cpp b/fs_mgr/fs_mgr.cpp
index 8f43160..3d4e7e4 100644
--- a/fs_mgr/fs_mgr.cpp
+++ b/fs_mgr/fs_mgr.cpp
@@ -887,7 +887,7 @@
 }
 
 static bool should_use_metadata_encryption(const FstabEntry& entry) {
-    return !entry.key_dir.empty() &&
+    return !entry.metadata_key_dir.empty() &&
            (entry.fs_mgr_flags.file_encryption || entry.fs_mgr_flags.force_fde_or_fbe);
 }
 
@@ -1159,7 +1159,7 @@
 static void WrapUserdataIfNeeded(FstabEntry* entry, const std::string& actual_block_device = {}) {
     const auto& block_device =
             actual_block_device.empty() ? entry->blk_device : actual_block_device;
-    if (entry->mount_point != "/data" || !entry->key_dir.empty() ||
+    if (entry->mount_point != "/data" || !entry->metadata_key_dir.empty() ||
         android::base::StartsWith(block_device, "/dev/block/dm-")) {
         return;
     }
diff --git a/fs_mgr/fs_mgr_fstab.cpp b/fs_mgr/fs_mgr_fstab.cpp
index a9342d8..291f81b 100644
--- a/fs_mgr/fs_mgr_fstab.cpp
+++ b/fs_mgr/fs_mgr_fstab.cpp
@@ -276,7 +276,7 @@
             entry->vbmeta_partition = arg;
         } else if (StartsWith(flag, "keydirectory=")) {
             // The metadata flag is followed by an = and the directory for the keys.
-            entry->key_dir = arg;
+            entry->metadata_key_dir = arg;
         } else if (StartsWith(flag, "sysfs_path=")) {
             // The path to trigger device gc by idle-maint of vold.
             entry->sysfs_path = arg;
@@ -586,8 +586,8 @@
         userdata.blk_device = "userdata_gsi";
         userdata.fs_mgr_flags.logical = true;
         userdata.fs_mgr_flags.formattable = true;
-        if (!userdata.key_dir.empty()) {
-            userdata.key_dir += "/gsi";
+        if (!userdata.metadata_key_dir.empty()) {
+            userdata.metadata_key_dir += "/gsi";
         }
     } else {
         userdata = BuildDsuUserdataFstabEntry();
diff --git a/fs_mgr/include_fstab/fstab/fstab.h b/fs_mgr/include_fstab/fstab/fstab.h
index e625170..2f6cde3 100644
--- a/fs_mgr/include_fstab/fstab/fstab.h
+++ b/fs_mgr/include_fstab/fstab/fstab.h
@@ -37,7 +37,7 @@
     unsigned long flags = 0;
     std::string fs_options;
     std::string key_loc;
-    std::string key_dir;
+    std::string metadata_key_dir;
     off64_t length = 0;
     std::string label;
     int partnum = -1;
diff --git a/fs_mgr/libdm/dm_target.cpp b/fs_mgr/libdm/dm_target.cpp
index 65f6e12..ea54029 100644
--- a/fs_mgr/libdm/dm_target.cpp
+++ b/fs_mgr/libdm/dm_target.cpp
@@ -244,8 +244,20 @@
 }
 
 std::string DmTargetDefaultKey::GetParameterString() const {
-    return cipher_ + " " + key_ + " " + blockdev_ + " " + std::to_string(start_sector_) +
-           (set_dun_ ? " 1 set_dun" : "");
+    std::vector<std::string> argv;
+    argv.emplace_back(cipher_);
+    argv.emplace_back(key_);
+    argv.emplace_back(blockdev_);
+    argv.push_back(std::to_string(start_sector_));
+    std::vector<std::string> extra_argv;
+    if (set_dun_) {
+        extra_argv.emplace_back("set_dun");
+    }
+    if (!extra_argv.empty()) {
+        argv.emplace_back(std::to_string(extra_argv.size()));
+        argv.insert(argv.end(), extra_argv.begin(), extra_argv.end());
+    }
+    return android::base::Join(argv, " ");
 }
 
 }  // namespace dm
diff --git a/fs_mgr/tests/fs_mgr_test.cpp b/fs_mgr/tests/fs_mgr_test.cpp
index 8dec458..d52f973 100644
--- a/fs_mgr/tests/fs_mgr_test.cpp
+++ b/fs_mgr/tests/fs_mgr_test.cpp
@@ -413,7 +413,7 @@
         EXPECT_TRUE(CompareFlags(flags, entry->fs_mgr_flags));
     }
     EXPECT_EQ("", entry->key_loc);
-    EXPECT_EQ("", entry->key_dir);
+    EXPECT_EQ("", entry->metadata_key_dir);
     EXPECT_EQ(0, entry->length);
     EXPECT_EQ("", entry->label);
     EXPECT_EQ(-1, entry->partnum);
@@ -438,7 +438,7 @@
         EXPECT_TRUE(CompareFlags(flags, entry->fs_mgr_flags));
     }
     EXPECT_EQ("", entry->key_loc);
-    EXPECT_EQ("", entry->key_dir);
+    EXPECT_EQ("", entry->metadata_key_dir);
     EXPECT_EQ(0, entry->length);
     EXPECT_EQ("", entry->label);
     EXPECT_EQ(-1, entry->partnum);
@@ -888,7 +888,7 @@
     FstabEntry::FsMgrFlags flags = {};
     EXPECT_TRUE(CompareFlags(flags, entry->fs_mgr_flags));
 
-    EXPECT_EQ("/dir/key", entry->key_dir);
+    EXPECT_EQ("/dir/key", entry->metadata_key_dir);
 }
 
 TEST(fs_mgr, ReadFstabFromFile_FsMgrOptions_SysfsPath) {