diff --git a/Checkpoint.cpp b/Checkpoint.cpp
index 56ec782..616365f 100644
--- a/Checkpoint.cpp
+++ b/Checkpoint.cpp
@@ -72,14 +72,11 @@
 }
 
 bool setBowState(std::string const& block_device, std::string const& state) {
-    if (block_device.substr(0, 5) != "/dev/") {
-        LOG(ERROR) << "Expected block device, got " << block_device;
-        return false;
-    }
+    std::string bow_device = fs_mgr_find_bow_device(block_device);
+    if (bow_device.empty()) return false;
 
-    std::string state_filename = std::string("/sys/") + block_device.substr(5) + "/bow/state";
-    if (!android::base::WriteStringToFile(state, state_filename)) {
-        PLOG(ERROR) << "Failed to write to file " << state_filename;
+    if (!android::base::WriteStringToFile(state, bow_device + "/bow/state")) {
+        PLOG(ERROR) << "Failed to write to file " << bow_device + "/bow/state";
         return false;
     }
 
@@ -287,7 +284,6 @@
 
 static void cp_healthDaemon(std::string mnt_pnt, std::string blk_device, bool is_fs_cp) {
     struct statvfs data;
-    uint64_t free_bytes = 0;
     uint32_t msleeptime = GetUintProperty(kSleepTimeProp, msleeptime_default, max_msleeptime);
     uint64_t min_free_bytes =
         GetUintProperty(kMinFreeBytesProp, min_free_bytes_default, (uint64_t)-1);
@@ -298,16 +294,17 @@
     msleeptime %= 1000;
     req.tv_nsec = msleeptime * 1000000;
     while (isCheckpointing) {
+        uint64_t free_bytes = 0;
         if (is_fs_cp) {
             statvfs(mnt_pnt.c_str(), &data);
             free_bytes = data.f_bavail * data.f_frsize;
         } else {
-            int ret;
-            std::string size_filename = std::string("/sys/") + blk_device.substr(5) + "/bow/free";
-            std::string content;
-            ret = android::base::ReadFileToString(size_filename, &content);
-            if (ret) {
-                free_bytes = std::strtoul(content.c_str(), NULL, 10);
+            std::string bow_device = fs_mgr_find_bow_device(blk_device);
+            if (!bow_device.empty()) {
+                std::string content;
+                if (android::base::ReadFileToString(bow_device + "/bow/free", &content)) {
+                    free_bytes = std::strtoul(content.c_str(), NULL, 10);
+                }
             }
         }
         if (free_bytes < min_free_bytes) {
diff --git a/EncryptInplace.cpp b/EncryptInplace.cpp
index f55932d..3755718 100644
--- a/EncryptInplace.cpp
+++ b/EncryptInplace.cpp
@@ -62,7 +62,8 @@
     off64_t one_pct, cur_pct, new_pct;
     off64_t blocks_already_done, tot_numblocks;
     off64_t used_blocks_already_done, tot_used_blocks;
-    char *real_blkdev, *crypto_blkdev;
+    const char* real_blkdev;
+    const char* crypto_blkdev;
     int count;
     off64_t offset;
     char* buffer;
@@ -244,8 +245,8 @@
     return rc;
 }
 
-static int cryptfs_enable_inplace_ext4(char* crypto_blkdev, char* real_blkdev, off64_t size,
-                                       off64_t* size_already_done, off64_t tot_size,
+static int cryptfs_enable_inplace_ext4(const char* crypto_blkdev, const char* real_blkdev,
+                                       off64_t size, off64_t* size_already_done, off64_t tot_size,
                                        off64_t previously_encrypted_upto,
                                        bool set_progress_properties) {
     u32 i;
@@ -383,8 +384,8 @@
     return 0;
 }
 
-static int cryptfs_enable_inplace_f2fs(char* crypto_blkdev, char* real_blkdev, off64_t size,
-                                       off64_t* size_already_done, off64_t tot_size,
+static int cryptfs_enable_inplace_f2fs(const char* crypto_blkdev, const char* real_blkdev,
+                                       off64_t size, off64_t* size_already_done, off64_t tot_size,
                                        off64_t previously_encrypted_upto,
                                        bool set_progress_properties) {
     struct encryptGroupsData data;
@@ -457,8 +458,8 @@
     return rc;
 }
 
-static int cryptfs_enable_inplace_full(char* crypto_blkdev, char* real_blkdev, off64_t size,
-                                       off64_t* size_already_done, off64_t tot_size,
+static int cryptfs_enable_inplace_full(const char* crypto_blkdev, const char* real_blkdev,
+                                       off64_t size, off64_t* size_already_done, off64_t tot_size,
                                        off64_t previously_encrypted_upto,
                                        bool set_progress_properties) {
     int realfd, cryptofd;
@@ -570,7 +571,7 @@
 }
 
 /* returns on of the ENABLE_INPLACE_* return codes */
-int cryptfs_enable_inplace(char* crypto_blkdev, char* real_blkdev, off64_t size,
+int cryptfs_enable_inplace(const char* crypto_blkdev, const char* real_blkdev, off64_t size,
                            off64_t* size_already_done, off64_t tot_size,
                            off64_t previously_encrypted_upto, bool set_progress_properties) {
     int rc_ext4, rc_f2fs, rc_full;
diff --git a/EncryptInplace.h b/EncryptInplace.h
index 71644ac..bf0c314 100644
--- a/EncryptInplace.h
+++ b/EncryptInplace.h
@@ -24,7 +24,7 @@
 #define RETRY_MOUNT_ATTEMPTS 10
 #define RETRY_MOUNT_DELAY_SECONDS 1
 
-int cryptfs_enable_inplace(char* crypto_blkdev, char* real_blkdev, off64_t size,
+int cryptfs_enable_inplace(const char* crypto_blkdev, const char* real_blkdev, off64_t size,
                            off64_t* size_already_done, off64_t tot_size,
                            off64_t previously_encrypted_upto, bool set_progress_properties);
 
diff --git a/MetadataCrypt.cpp b/MetadataCrypt.cpp
index 573d4cc..bff38b2 100644
--- a/MetadataCrypt.cpp
+++ b/MetadataCrypt.cpp
@@ -185,7 +185,8 @@
     return true;
 }
 
-bool fscrypt_mount_metadata_encrypted(const std::string& mount_point, bool needs_encrypt) {
+bool fscrypt_mount_metadata_encrypted(const std::string& blk_device, const std::string& mount_point,
+                                      bool needs_encrypt) {
     LOG(DEBUG) << "fscrypt_mount_metadata_encrypted: " << mount_point << " " << needs_encrypt;
     auto encrypted_state = android::base::GetProperty("ro.crypto.state", "");
     if (encrypted_state != "") {
@@ -203,13 +204,14 @@
     uint64_t nr_sec;
     if (!get_number_of_sectors(data_rec->blk_device, &nr_sec)) return false;
     std::string crypto_blkdev;
-    if (!create_crypto_blk_dev(kDmNameUserdata, nr_sec, data_rec->blk_device, key, &crypto_blkdev))
+    if (!create_crypto_blk_dev(kDmNameUserdata, nr_sec, blk_device, key, &crypto_blkdev))
         return false;
+
     // FIXME handle the corrupt case
     if (needs_encrypt) {
         LOG(INFO) << "Beginning inplace encryption, nr_sec: " << nr_sec;
         off64_t size_already_done = 0;
-        auto rc = cryptfs_enable_inplace(crypto_blkdev.data(), data_rec->blk_device.data(), nr_sec,
+        auto rc = cryptfs_enable_inplace(crypto_blkdev.data(), blk_device.data(), nr_sec,
                                          &size_already_done, nr_sec, 0, false);
         if (rc != 0) {
             LOG(ERROR) << "Inplace crypto failed with code: " << rc;
diff --git a/MetadataCrypt.h b/MetadataCrypt.h
index d82a43b..cd0f5e5 100644
--- a/MetadataCrypt.h
+++ b/MetadataCrypt.h
@@ -19,6 +19,7 @@
 
 #include <string>
 
-bool fscrypt_mount_metadata_encrypted(const std::string& mount_point, bool needs_encrypt);
+bool fscrypt_mount_metadata_encrypted(const std::string& block_device,
+                                      const std::string& mount_point, bool needs_encrypt);
 
 #endif
diff --git a/VoldNativeService.cpp b/VoldNativeService.cpp
index 623cced..3a8754f 100644
--- a/VoldNativeService.cpp
+++ b/VoldNativeService.cpp
@@ -722,18 +722,20 @@
     return ok();
 }
 
-binder::Status VoldNativeService::mountFstab(const std::string& mountPoint) {
+binder::Status VoldNativeService::mountFstab(const std::string& blkDevice,
+                                             const std::string& mountPoint) {
     ENFORCE_UID(AID_SYSTEM);
     ACQUIRE_LOCK;
 
-    return translateBool(fscrypt_mount_metadata_encrypted(mountPoint, false));
+    return translateBool(fscrypt_mount_metadata_encrypted(blkDevice, mountPoint, false));
 }
 
-binder::Status VoldNativeService::encryptFstab(const std::string& mountPoint) {
+binder::Status VoldNativeService::encryptFstab(const std::string& blkDevice,
+                                               const std::string& mountPoint) {
     ENFORCE_UID(AID_SYSTEM);
     ACQUIRE_LOCK;
 
-    return translateBool(fscrypt_mount_metadata_encrypted(mountPoint, true));
+    return translateBool(fscrypt_mount_metadata_encrypted(blkDevice, mountPoint, true));
 }
 
 binder::Status VoldNativeService::createUserKey(int32_t userId, int32_t userSerial, bool ephemeral) {
diff --git a/VoldNativeService.h b/VoldNativeService.h
index b90c5b8..7b6edfa 100644
--- a/VoldNativeService.h
+++ b/VoldNativeService.h
@@ -99,8 +99,8 @@
     binder::Status mountDefaultEncrypted();
     binder::Status initUser0();
     binder::Status isConvertibleToFbe(bool* _aidl_return);
-    binder::Status mountFstab(const std::string& mountPoint);
-    binder::Status encryptFstab(const std::string& mountPoint);
+    binder::Status mountFstab(const std::string& blkDevice, const std::string& mountPoint);
+    binder::Status encryptFstab(const std::string& blkDevice, const std::string& mountPoint);
 
     binder::Status createUserKey(int32_t userId, int32_t userSerial, bool ephemeral);
     binder::Status destroyUserKey(int32_t userId);
diff --git a/binder/android/os/IVold.aidl b/binder/android/os/IVold.aidl
index 72f2643..abcbf4a 100644
--- a/binder/android/os/IVold.aidl
+++ b/binder/android/os/IVold.aidl
@@ -78,8 +78,8 @@
     void mountDefaultEncrypted();
     void initUser0();
     boolean isConvertibleToFbe();
-    void mountFstab(@utf8InCpp String mountPoint);
-    void encryptFstab(@utf8InCpp String mountPoint);
+    void mountFstab(@utf8InCpp String blkDevice, @utf8InCpp String mountPoint);
+    void encryptFstab(@utf8InCpp String blkDevice, @utf8InCpp String mountPoint);
 
     void createUserKey(int userId, int userSerial, boolean ephemeral);
     void destroyUserKey(int userId);
diff --git a/vdc.cpp b/vdc.cpp
index 6136413..839e70e 100644
--- a/vdc.cpp
+++ b/vdc.cpp
@@ -103,10 +103,10 @@
         checkStatus(args, vold->shutdown());
     } else if (args[0] == "cryptfs" && args[1] == "checkEncryption" && args.size() == 3) {
         checkStatus(args, vold->checkEncryption(args[2]));
-    } else if (args[0] == "cryptfs" && args[1] == "mountFstab" && args.size() == 3) {
-        checkStatus(args, vold->mountFstab(args[2]));
-    } else if (args[0] == "cryptfs" && args[1] == "encryptFstab" && args.size() == 3) {
-        checkStatus(args, vold->encryptFstab(args[2]));
+    } else if (args[0] == "cryptfs" && args[1] == "mountFstab" && args.size() == 4) {
+        checkStatus(args, vold->mountFstab(args[2], args[3]));
+    } else if (args[0] == "cryptfs" && args[1] == "encryptFstab" && args.size() == 4) {
+        checkStatus(args, vold->encryptFstab(args[2], args[3]));
     } else if (args[0] == "checkpoint" && args[1] == "supportsCheckpoint" && args.size() == 2) {
         bool supported = false;
         checkStatus(args, vold->supportsCheckpoint(&supported));