Expose statfs() through IMediaContainerService.

    boolean checkExternalFreeStorage(in Uri fileUri);

    ObbInfo getObbInfo(in String filename);

    long calculateDirectorySize(in String directory);

    /** Return file system stats: [0] is total bytes, [1] is available bytes */

    long[] getFileSystemStats(in String path);

}

import java.io.InputStream;

import java.io.OutputStream;

import libcore.io.ErrnoException;

import libcore.io.Libcore;

import libcore.io.StructStatFs;

/*

 * This service copies a downloaded apk to a file passed in as

 * a ParcelFileDescriptor or to a newly created container specified

                return 0L;

            }

        }

        @Override

        public long[] getFileSystemStats(String path) {

            try {

                final StructStatFs stat = Libcore.os.statfs(path);

                final long totalSize = stat.f_blocks * stat.f_bsize;

                final long availSize = stat.f_bavail * stat.f_bsize;

                return new long[] { totalSize, availSize };

            } catch (ErrnoException e) {

                throw new IllegalStateException(e);

            }

        }

    };

    public DefaultContainerService() {