diff --git a/Loop.cpp b/Loop.cpp
index dad2c3f..78df132 100644
--- a/Loop.cpp
+++ b/Loop.cpp
@@ -21,6 +21,7 @@
 #include <errno.h>
 #include <string.h>
 
+#include <sys/mount.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/ioctl.h>
@@ -33,6 +34,7 @@
 
 #include <sysutils/SocketClient.h>
 #include "Loop.h"
+#include "Asec.h"
 
 int Loop::dumpState(SocketClient *c) {
     int i;
@@ -246,3 +248,45 @@
     close(fd);
     return 0;
 }
+
+int Loop::lookupInfo(const char *loopDevice, struct asec_superblock *sb, unsigned int *nr_sec) {
+    int fd;
+    struct asec_superblock buffer;
+
+    if ((fd = open(loopDevice, O_RDONLY)) < 0) {
+        SLOGE("Failed to open loopdevice (%s)", strerror(errno));
+        destroyByDevice(loopDevice);
+        return -1;
+    }
+
+    if (ioctl(fd, BLKGETSIZE, nr_sec)) {
+        SLOGE("Failed to get loop size (%s)", strerror(errno));
+        destroyByDevice(loopDevice);
+        close(fd);
+        return -1;
+    }
+
+    /*
+     * Try to read superblock.
+     */
+    memset(&buffer, 0, sizeof(struct asec_superblock));
+    if (lseek(fd, ((*nr_sec - 1) * 512), SEEK_SET) < 0) {
+        SLOGE("lseek failed (%s)", strerror(errno));
+        close(fd);
+        destroyByDevice(loopDevice);
+        return -1;
+    }
+    if (read(fd, &buffer, sizeof(struct asec_superblock)) != sizeof(struct asec_superblock)) {
+        SLOGE("superblock read failed (%s)", strerror(errno));
+        close(fd);
+        destroyByDevice(loopDevice);
+        return -1;
+    }
+    close(fd);
+
+    /*
+     * Superblock successfully read. Copy to caller's struct.
+     */
+    memcpy(sb, &buffer, sizeof(struct asec_superblock));
+    return 0;
+}