Kernel: Move Partition code files to the Storage folder

This folder is more appropriate for these files.

Kernel/Storage/Partition/DiskPartition.cpp

@@ -0,0 +1,106 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <Kernel/FileSystem/FileDescription.h>
+#include <Kernel/Storage/Partition/DiskPartition.h>
+
+// #define OFFD_DEBUG
+
+namespace Kernel {
+
+NonnullRefPtr<DiskPartition> DiskPartition::create(BlockDevice& device, unsigned block_offset, unsigned block_limit)
+{
+    return adopt(*new DiskPartition(device, block_offset, block_limit));
+}
+
+DiskPartition::DiskPartition(BlockDevice& device, unsigned block_offset, unsigned block_limit)
+    : BlockDevice(100, 0, device.block_size())
+    , m_device(device)
+    , m_block_offset(block_offset)
+    , m_block_limit(block_limit)
+{
+}
+
+DiskPartition::~DiskPartition()
+{
+}
+
+void DiskPartition::start_request(AsyncBlockDeviceRequest& request)
+{
+    request.add_sub_request(m_device->make_request<AsyncBlockDeviceRequest>(request.request_type(),
+        request.block_index() + m_block_offset, request.block_count(), request.buffer(), request.buffer_size()));
+}
+
+KResultOr<size_t> DiskPartition::read(FileDescription& fd, size_t offset, UserOrKernelBuffer& outbuf, size_t len)
+{
+    unsigned adjust = m_block_offset * block_size();
+
+#ifdef OFFD_DEBUG
+    klog() << "DiskPartition::read offset=" << fd.offset() << " adjust=" << adjust << " len=" << len;
+#endif
+
+    return m_device->read(fd, offset + adjust, outbuf, len);
+}
+
+bool DiskPartition::can_read(const FileDescription& fd, size_t offset) const
+{
+    unsigned adjust = m_block_offset * block_size();
+
+#ifdef OFFD_DEBUG
+    klog() << "DiskPartition::can_read offset=" << offset << " adjust=" << adjust;
+#endif
+
+    return m_device->can_read(fd, offset + adjust);
+}
+
+KResultOr<size_t> DiskPartition::write(FileDescription& fd, size_t offset, const UserOrKernelBuffer& inbuf, size_t len)
+{
+    unsigned adjust = m_block_offset * block_size();
+
+#ifdef OFFD_DEBUG
+    klog() << "DiskPartition::write offset=" << offset << " adjust=" << adjust << " len=" << len;
+#endif
+
+    return m_device->write(fd, offset + adjust, inbuf, len);
+}
+
+bool DiskPartition::can_write(const FileDescription& fd, size_t offset) const
+{
+    unsigned adjust = m_block_offset * block_size();
+
+#ifdef OFFD_DEBUG
+    klog() << "DiskPartition::can_write offset=" << offset << " adjust=" << adjust;
+#endif
+
+    return m_device->can_write(fd, offset + adjust);
+}
+
+const char* DiskPartition::class_name() const
+{
+    return "DiskPartition";
+}
+
+}