Added implementation of FileSystem::reformat

LittleFileSystem.cpp

@@ -223,6 +223,31 @@ int LittleFileSystem::format(BlockDevice *bd,
     return 0;
 }
 
+int LittleFileSystem::reformat(BlockDevice *bd) {
+    if (_bd) {
+        if (!bd) {
+            bd = _bd;
+        }
+
+        int err = unmount();
+        if (err) {
+            return err;
+        }
+    }
+
+    if (!bd) {
+        return -ENODEV;
+    }
+
+    int err = LittleFileSystem::format(bd,
+            _read_size, _prog_size, _block_size, _lookahead);
+    if (err) {
+        return err;
+    }
+
+    return mount(bd);
+}
+
 int LittleFileSystem::remove(const char *filename) {
     int err = lfs_remove(&_lfs, filename);
     return lfs_toerror(err);

LittleFileSystem.h

@@ -65,7 +65,7 @@ public:
             lfs_size_t lookahead=MBED_LFS_LOOKAHEAD);
     virtual ~LittleFileSystem();
     
-    /** Formats a logical drive, FDISK partitioning rule.
+    /** Formats a block device with the LittleFileSystem
      *
      *  The block device to format should be mounted when this function is called.
      *
@@ -107,6 +107,18 @@ public:
      */
     virtual int unmount();
 
+    /** Reformats a filesystem, results in an empty and mounted filesystem
+     *
+     *  @param bd
+     *      BlockDevice to reformat and mount. If NULL, the mounted
+     *      block device will be used.
+     *      Note: if mount fails, bd must be provided.
+     *      Default: NULL
+     *
+     *  @return         0 on success, negative error code on failure
+     */
+    virtual int reformat(BlockDevice *bd);
+
     /** Remove a file from the filesystem.
      *
      *  @param path     The name of the file to remove.