diff --git a/encryptedstore/src/main.rs b/encryptedstore/src/main.rs
index 9a701ed..d7d2382 100644
--- a/encryptedstore/src/main.rs
+++ b/encryptedstore/src/main.rs
@@ -22,8 +22,16 @@
 use clap::{arg, App};
 use dm::{crypt::CipherType, util};
 use log::info;
+use std::ffi::CString;
+use std::fs::{create_dir_all, OpenOptions};
+use std::io::{Error, Read, Write};
+use std::os::unix::ffi::OsStrExt;
 use std::os::unix::fs::FileTypeExt;
-use std::path::Path;
+use std::path::{Path, PathBuf};
+use std::process::Command;
+
+const MK2FS_BIN: &str = "/system/bin/mke2fs";
+const UNFORMATTED_STORAGE_MAGIC: &str = "UNFORMATTED-STORAGE";
 
 fn main() -> Result<()> {
     android_logger::init_once(
@@ -38,11 +46,21 @@
             arg!(--blkdevice <FILE> "the block device backing the encrypted storage")
                 .required(true),
             arg!(--key <KEY> "key (in hex) equivalent to 64 bytes)").required(true),
+            arg!(--mountpoint <MOUNTPOINT> "mount point for the storage").required(true),
         ])
         .get_matches();
 
     let blkdevice = Path::new(matches.value_of("blkdevice").unwrap());
     let key = matches.value_of("key").unwrap();
+    let mountpoint = Path::new(matches.value_of("mountpoint").unwrap());
+    encryptedstore_init(blkdevice, key, mountpoint).context(format!(
+        "Unable to initialize encryptedstore on {:?} & mount at {:?}",
+        blkdevice, mountpoint
+    ))?;
+    Ok(())
+}
+
+fn encryptedstore_init(blkdevice: &Path, key: &str, mountpoint: &Path) -> Result<()> {
     ensure!(
         std::fs::metadata(&blkdevice)
             .context(format!("Failed to get metadata of {:?}", blkdevice))?
@@ -52,11 +70,21 @@
         blkdevice
     );
 
-    enable_crypt(blkdevice, key, "cryptdev")?;
+    let needs_formatting =
+        needs_formatting(blkdevice).context("Unable to check if formatting is required")?;
+    let crypt_device =
+        enable_crypt(blkdevice, key, "cryptdev").context("Unable to map crypt device")?;
+
+    // We might need to format it with filesystem if this is a "seen-for-the-first-time" device.
+    if needs_formatting {
+        info!("Freshly formatting the crypt device");
+        format_ext4(&crypt_device)?;
+    }
+    mount(&crypt_device, mountpoint).context(format!("Unable to mount {:?}", crypt_device))?;
     Ok(())
 }
 
-fn enable_crypt(data_device: &Path, key: &str, name: &str) -> Result<()> {
+fn enable_crypt(data_device: &Path, key: &str, name: &str) -> Result<PathBuf> {
     let dev_size = util::blkgetsize64(data_device)?;
     let key = hex::decode(key).context("Unable to decode hex key")?;
     ensure!(key.len() == 64, "We need 64 bytes' key for aes-xts cipher for block encryption");
@@ -69,7 +97,63 @@
         .build()
         .context("Couldn't build the DMCrypt target")?;
     let dm = dm::DeviceMapper::new()?;
-    dm.create_crypt_device(name, &target).context("Failed to create dm-crypt device")?;
+    dm.create_crypt_device(name, &target).context("Failed to create dm-crypt device")
+}
 
+// The disk contains UNFORMATTED_STORAGE_MAGIC to indicate we need to format the crypt device.
+// This function looks for it, zeroing it, if present.
+fn needs_formatting(data_device: &Path) -> Result<bool> {
+    let mut file = OpenOptions::new()
+        .read(true)
+        .write(true)
+        .open(data_device)
+        .with_context(|| format!("Failed to open {:?}", data_device))?;
+
+    let mut buf = [0; UNFORMATTED_STORAGE_MAGIC.len()];
+    file.read_exact(&mut buf)?;
+
+    if buf == UNFORMATTED_STORAGE_MAGIC.as_bytes() {
+        buf.fill(0);
+        file.write_all(&buf)?;
+        return Ok(true);
+    }
+    Ok(false)
+}
+
+fn format_ext4(device: &Path) -> Result<()> {
+    let mkfs_options = [
+        "-j",               // Create appropriate sized journal
+        "-O metadata_csum", // Metadata checksum for filesystem integrity
+    ];
+    let mut cmd = Command::new(MK2FS_BIN);
+    let status = cmd
+        .args(mkfs_options)
+        .arg(device)
+        .status()
+        .context(format!("failed to execute {}", MK2FS_BIN))?;
+    ensure!(status.success(), "mkfs failed with {:?}", status);
     Ok(())
 }
+
+fn mount(source: &Path, mountpoint: &Path) -> Result<()> {
+    create_dir_all(mountpoint).context(format!("Failed to create {:?}", &mountpoint))?;
+    let mount_options = CString::new("").unwrap();
+    let source = CString::new(source.as_os_str().as_bytes())?;
+    let mountpoint = CString::new(mountpoint.as_os_str().as_bytes())?;
+    let fstype = CString::new("ext4").unwrap();
+
+    let ret = unsafe {
+        libc::mount(
+            source.as_ptr(),
+            mountpoint.as_ptr(),
+            fstype.as_ptr(),
+            libc::MS_NOSUID | libc::MS_NODEV | libc::MS_NOEXEC,
+            mount_options.as_ptr() as *const std::ffi::c_void,
+        )
+    };
+    if ret < 0 {
+        Err(Error::last_os_error()).context("mount failed")
+    } else {
+        Ok(())
+    }
+}