diff --git a/adb/daemon/remount_service.cpp b/adb/daemon/remount_service.cpp
index 2dcfb53..b72ed16 100644
--- a/adb/daemon/remount_service.cpp
+++ b/adb/daemon/remount_service.cpp
@@ -97,8 +97,12 @@
     }
 }
 
+bool dev_is_overlayfs(const std::string& dev) {
+    return (dev == "overlay") || (dev == "overlayfs");
+}
+
 bool make_block_device_writable(const std::string& dev) {
-    if ((dev == "overlay") || (dev == "overlayfs")) return true;
+    if (dev_is_overlayfs(dev)) return true;
     int fd = unix_open(dev.c_str(), O_RDONLY | O_CLOEXEC);
     if (fd == -1) {
         return false;
@@ -161,6 +165,10 @@
         return true;
     }
     bool is_root = strcmp(dir, "/") == 0;
+    if (is_root && dev_is_overlayfs(find_mount("/system", false))) {
+        dir = "/system";
+        is_root = false;
+    }
     std::string dev = find_mount(dir, is_root);
     if (is_root && dev.empty()) {
         // The fstab entry will be /system if the device switched roots during
diff --git a/fs_mgr/fs_mgr_fstab.cpp b/fs_mgr/fs_mgr_fstab.cpp
index fc3a05c..e89c91c 100644
--- a/fs_mgr/fs_mgr_fstab.cpp
+++ b/fs_mgr/fs_mgr_fstab.cpp
@@ -403,10 +403,13 @@
 static bool is_dt_fstab_compatible() {
     std::string dt_value;
     std::string file_name = get_android_dt_dir() + "/fstab/compatible";
-    if (read_dt_file(file_name, &dt_value)) {
-        if (dt_value == "android,fstab") {
-            return true;
-        }
+
+    if (read_dt_file(file_name, &dt_value) && dt_value == "android,fstab") {
+        // If there's no status property or its set to "ok" or "okay", then we use the DT fstab.
+        std::string status_value;
+        std::string status_file_name = get_android_dt_dir() + "/fstab/status";
+        return !read_dt_file(status_file_name, &status_value) || status_value == "ok" ||
+               status_value == "okay";
     }
 
     return false;
diff --git a/fs_mgr/liblp/writer.cpp b/fs_mgr/liblp/writer.cpp
index c740bd4..f4c9b99 100644
--- a/fs_mgr/liblp/writer.cpp
+++ b/fs_mgr/liblp/writer.cpp
@@ -82,12 +82,8 @@
 
 // Perform sanity checks so we don't accidentally overwrite valid metadata
 // with potentially invalid metadata, or random partition data with metadata.
-static bool ValidateAndSerializeMetadata(int fd, const LpMetadata& metadata, std::string* blob) {
-    uint64_t blockdevice_size;
-    if (!GetDescriptorSize(fd, &blockdevice_size)) {
-        return false;
-    }
-
+static bool ValidateAndSerializeMetadata(const IPartitionOpener& opener, const LpMetadata& metadata,
+                                         std::string* blob) {
     const LpMetadataHeader& header = metadata.header;
     const LpMetadataGeometry& geometry = metadata.geometry;
 
@@ -104,7 +100,7 @@
     // metadata.
     uint64_t reserved_size = LP_METADATA_GEOMETRY_SIZE +
                              uint64_t(geometry.metadata_max_size) * geometry.metadata_slot_count;
-    uint64_t total_reserved = reserved_size * 2;
+    uint64_t total_reserved = LP_PARTITION_RESERVED_BYTES + reserved_size * 2;
 
     const LpMetadataBlockDevice* super_device = GetMetadataSuperBlockDevice(metadata);
     if (!super_device) {
@@ -112,15 +108,27 @@
         return false;
     }
 
-    if (total_reserved > blockdevice_size ||
-        total_reserved > super_device->first_logical_sector * LP_SECTOR_SIZE) {
+    if (total_reserved > super_device->first_logical_sector * LP_SECTOR_SIZE) {
         LERROR << "Not enough space to store all logical partition metadata slots.";
         return false;
     }
-    if (blockdevice_size != super_device->size) {
-        LERROR << "Block device size " << blockdevice_size
-               << " does not match metadata requested size " << super_device->size;
-        return false;
+    for (const auto& block_device : metadata.block_devices) {
+        std::string partition_name = GetBlockDevicePartitionName(block_device);
+        if ((block_device.first_logical_sector + 1) * LP_SECTOR_SIZE > block_device.size) {
+            LERROR << "Block device " << partition_name << " has invalid first sector "
+                   << block_device.first_logical_sector << " for size " << block_device.size;
+            return false;
+        }
+        BlockDeviceInfo info;
+        if (!opener.GetInfo(partition_name, &info)) {
+            PERROR << partition_name << ": ioctl";
+            return false;
+        }
+        if (info.size != block_device.size) {
+            LERROR << "Block device " << partition_name << " size mismatch (expected"
+                   << block_device.size << ", got " << info.size << ")";
+            return false;
+        }
     }
 
     // Make sure all partition entries reference valid extents.
@@ -230,7 +238,7 @@
     // basic checks that the geometry and tables are coherent, and will fit
     // on the given block device.
     std::string metadata_blob;
-    if (!ValidateAndSerializeMetadata(fd, metadata, &metadata_blob)) {
+    if (!ValidateAndSerializeMetadata(opener, metadata, &metadata_blob)) {
         return false;
     }
 
@@ -295,7 +303,7 @@
     // basic checks that the geometry and tables are coherent, and will fit
     // on the given block device.
     std::string blob;
-    if (!ValidateAndSerializeMetadata(fd, metadata, &blob)) {
+    if (!ValidateAndSerializeMetadata(opener, metadata, &blob)) {
         return false;
     }
 
@@ -327,7 +335,7 @@
         // synchronize the backup copy. This guarantees that a partial write
         // still leaves one copy intact.
         std::string old_blob;
-        if (!ValidateAndSerializeMetadata(fd, *primary.get(), &old_blob)) {
+        if (!ValidateAndSerializeMetadata(opener, *primary.get(), &old_blob)) {
             LERROR << "Error serializing primary metadata to repair corrupted backup";
             return false;
         }
@@ -339,7 +347,7 @@
         // The backup copy is coherent, and the primary is not. Sync it for
         // safety.
         std::string old_blob;
-        if (!ValidateAndSerializeMetadata(fd, *backup.get(), &old_blob)) {
+        if (!ValidateAndSerializeMetadata(opener, *backup.get(), &old_blob)) {
             LERROR << "Error serializing primary metadata to repair corrupted backup";
             return false;
         }
diff --git a/fs_mgr/tests/adb-remount-test.sh b/fs_mgr/tests/adb-remount-test.sh
index 6b908d3..98c0879 100755
--- a/fs_mgr/tests/adb-remount-test.sh
+++ b/fs_mgr/tests/adb-remount-test.sh
@@ -274,9 +274,8 @@
   echo "${D}" | grep "^overlay .* /system\$" >/dev/null ||
   die  "overlay takeover after remount"
 !(adb_sh grep "^overlay " /proc/mounts </dev/null | grep " overlay ro,") &&
-  !(adb_sh grep " rw," /proc/mounts </dev/null |
-  skip_administrative_mounts) ||
-    die "remount overlayfs missed a spot"
+  !(adb_sh grep " rw," /proc/mounts </dev/null | skip_administrative_mounts) ||
+  die "remount overlayfs missed a spot (ro)"
 
 adb_su "sed -n '1,/overlay \\/system/p' /proc/mounts" </dev/null |
   skip_administrative_mounts |
diff --git a/run-as/.clang-format b/run-as/.clang-format
new file mode 120000
index 0000000..fd0645f
--- /dev/null
+++ b/run-as/.clang-format
@@ -0,0 +1 @@
+../.clang-format-2
\ No newline at end of file
diff --git a/run-as/run-as.cpp b/run-as/run-as.cpp
index ac470d4..971b9f4 100644
--- a/run-as/run-as.cpp
+++ b/run-as/run-as.cpp
@@ -144,7 +144,7 @@
   // Some devices can disable running run-as, such as Chrome OS when running in
   // non-developer mode.
   if (android::base::GetBoolProperty("ro.boot.disable_runas", false)) {
-      error(1, 0, "run-as is disabled from the kernel commandline");
+    error(1, 0, "run-as is disabled from the kernel commandline");
   }
 
   char* pkgname = argv[1];