/* $Id$ */
/**
 * Storage: Testcase for compacting disks.
 */

/*
 * Copyright (C) 2011-2023 Oracle and/or its affiliates.
 *
 * This file is part of VirtualBox base platform packages, as
 * available from https://www.virtualbox.org.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation, in version 3 of the
 * License.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see <https://www.gnu.org/licenses>.
 *
 * SPDX-License-Identifier: GPL-3.0-only
 */

void tstCompact(string strMsg, string strBackend)
{
    print(strMsg);

    /* Create disk containers, read verification is on. */
    createdisk("disk", true);
    create("disk", "base", "tstCompact.disk", "dynamic", strBackend, 200M, false, false);

    /* Fill the disk with random data. */
    io("disk", false, 1, "seq", 64K, 0, 200M, 200M, 100, "none");
    /* Read the data to verify it once. */
    io("disk", false, 1, "seq", 64K, 0, 200M, 200M,   0, "none");
    /* Fill a part with 0's. */
    io("disk", false, 1, "seq", 64K, 100M, 150M, 50M, 100, "zero");

    /* Now compact. */
    compact("disk", 0);
    /* Read again to verify that the content hasn't changed. */
    io("disk", false, 1, "seq", 64K, 0, 200M, 200M,   0, "none");
    /* Fill everything with 0. */
    io("disk", false, 1, "seq", 64K, 0, 200M, 200M, 100, "zero");
    /* Now compact again. */
    compact("disk", 0);
    /* Read again to verify that the content hasn't changed. */
    io("disk", false, 1, "seq", 64K, 0, 200M, 200M,   0, "none");

    close("disk", "single", true);
    destroydisk("disk");
}

void tstSnapshotCompact(string strMsg, string strBackend)
{
    print(strMsg);

    /* Create disk containers, read verification is on. */
    createdisk("disk", true);
    create("disk", "base", "tstCompact.disk", "dynamic", strBackend, 200M, false, false);

    /* Fill the disk with random data. */
    io("disk", false, 1, "seq", 64K, 0, 100M, 100M, 100, "none");

    create("test", "diff", "tst2.disk", "dynamic", strBackend, 200M, false /* fIgnoreFlush */, true /* fHonorSame */);

    io("disk", false, 1, "seq", 64K, 100M, 200M, 100M, 100, "none");
    io("disk", false, 1, "seq", 64K, 100M, 150M, 50M, 100, "zero");

    create("disk", "diff", "tst3.disk", "dynamic", strBackend, 200M, false /* fIgnoreFlush */, true /* fHonorSame */);
    merge("disk", 1, 2);

    compact("disk", 1);

    close("disk", "single", true);
    close("disk", "single", true);
    close("disk", "single", true);
    destroydisk("disk");
}

void main()
{
    /* Init I/O RNG for generating random data for writes. */
    iorngcreate(10M, "manual", 1234567890);

    /* Create zero pattern */
    iopatterncreatefromnumber("zero", 1M, 0);

    tstCompact("Testing VDI", "VDI");
    tstCompact("Testing VHD", "VHD");

    tstSnapshotCompact("Testing Snapshot VDI", "VDI");
    tstSnapshotCompact("Testing Snapshot VHD", "VHD");

    /* Destroy RNG and pattern */
    iopatterndestroy("zero");
    iorngdestroy();
}