--- /dev/null
+/*
+ * Block driver for Hyper-V VHDX Images
+ *
+ * Copyright (c) 2013 Red Hat, Inc.,
+ *
+ * Authors:
+ * Jeff Cody <jcody@redhat.com>
+ *
+ * This is based on the "VHDX Format Specification v1.00", published 8/25/2012
+ * by Microsoft:
+ * https://www.microsoft.com/en-us/download/details.aspx?id=34750
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2 or later.
+ * See the COPYING.LIB file in the top-level directory.
+ *
+ */
+
+#include "qemu-common.h"
+#include "block/block_int.h"
+#include "block/vhdx.h"
+
+#include <uuid/uuid.h>
+
+
+/*
+ * All the VHDX formats on disk are little endian - the following
+ * are helper import/export functions to correctly convert
+ * endianness from disk read to native cpu format, and back again.
+ */
+
+
+/* VHDX File Header */
+
+
+void vhdx_header_le_import(VHDXHeader *h)
+{
+ assert(h != NULL);
+
+ le32_to_cpus(&h->signature);
+ le32_to_cpus(&h->checksum);
+ le64_to_cpus(&h->sequence_number);
+
+ leguid_to_cpus(&h->file_write_guid);
+ leguid_to_cpus(&h->data_write_guid);
+ leguid_to_cpus(&h->log_guid);
+
+ le16_to_cpus(&h->log_version);
+ le16_to_cpus(&h->version);
+ le32_to_cpus(&h->log_length);
+ le64_to_cpus(&h->log_offset);
+}
+
+void vhdx_header_le_export(VHDXHeader *orig_h, VHDXHeader *new_h)
+{
+ assert(orig_h != NULL);
+ assert(new_h != NULL);
+
+ new_h->signature = cpu_to_le32(orig_h->signature);
+ new_h->checksum = cpu_to_le32(orig_h->checksum);
+ new_h->sequence_number = cpu_to_le64(orig_h->sequence_number);
+
+ new_h->file_write_guid = orig_h->file_write_guid;
+ new_h->data_write_guid = orig_h->data_write_guid;
+ new_h->log_guid = orig_h->log_guid;
+
+ cpu_to_leguids(&new_h->file_write_guid);
+ cpu_to_leguids(&new_h->data_write_guid);
+ cpu_to_leguids(&new_h->log_guid);
+
+ new_h->log_version = cpu_to_le16(orig_h->log_version);
+ new_h->version = cpu_to_le16(orig_h->version);
+ new_h->log_length = cpu_to_le32(orig_h->log_length);
+ new_h->log_offset = cpu_to_le64(orig_h->log_offset);
+}
+
+
+/* VHDX Log Headers */
+
+
+void vhdx_log_desc_le_import(VHDXLogDescriptor *d)
+{
+ assert(d != NULL);
+
+ le32_to_cpus(&d->signature);
+ le64_to_cpus(&d->file_offset);
+ le64_to_cpus(&d->sequence_number);
+}
+
+void vhdx_log_desc_le_export(VHDXLogDescriptor *d)
+{
+ assert(d != NULL);
+
+ cpu_to_le32s(&d->signature);
+ cpu_to_le32s(&d->trailing_bytes);
+ cpu_to_le64s(&d->leading_bytes);
+ cpu_to_le64s(&d->file_offset);
+ cpu_to_le64s(&d->sequence_number);
+}
+
+void vhdx_log_data_le_import(VHDXLogDataSector *d)
+{
+ assert(d != NULL);
+
+ le32_to_cpus(&d->data_signature);
+ le32_to_cpus(&d->sequence_high);
+ le32_to_cpus(&d->sequence_low);
+}
+
+void vhdx_log_data_le_export(VHDXLogDataSector *d)
+{
+ assert(d != NULL);
+
+ cpu_to_le32s(&d->data_signature);
+ cpu_to_le32s(&d->sequence_high);
+ cpu_to_le32s(&d->sequence_low);
+}
+
+void vhdx_log_entry_hdr_le_import(VHDXLogEntryHeader *hdr)
+{
+ assert(hdr != NULL);
+
+ le32_to_cpus(&hdr->signature);
+ le32_to_cpus(&hdr->checksum);
+ le32_to_cpus(&hdr->entry_length);
+ le32_to_cpus(&hdr->tail);
+ le64_to_cpus(&hdr->sequence_number);
+ le32_to_cpus(&hdr->descriptor_count);
+ leguid_to_cpus(&hdr->log_guid);
+ le64_to_cpus(&hdr->flushed_file_offset);
+ le64_to_cpus(&hdr->last_file_offset);
+}
+
+void vhdx_log_entry_hdr_le_export(VHDXLogEntryHeader *hdr)
+{
+ assert(hdr != NULL);
+
+ cpu_to_le32s(&hdr->signature);
+ cpu_to_le32s(&hdr->checksum);
+ cpu_to_le32s(&hdr->entry_length);
+ cpu_to_le32s(&hdr->tail);
+ cpu_to_le64s(&hdr->sequence_number);
+ cpu_to_le32s(&hdr->descriptor_count);
+ cpu_to_leguids(&hdr->log_guid);
+ cpu_to_le64s(&hdr->flushed_file_offset);
+ cpu_to_le64s(&hdr->last_file_offset);
+}
+
+
+/* Region table entries */
+void vhdx_region_header_le_import(VHDXRegionTableHeader *hdr)
+{
+ assert(hdr != NULL);
+
+ le32_to_cpus(&hdr->signature);
+ le32_to_cpus(&hdr->checksum);
+ le32_to_cpus(&hdr->entry_count);
+}
+
+void vhdx_region_header_le_export(VHDXRegionTableHeader *hdr)
+{
+ assert(hdr != NULL);
+
+ cpu_to_le32s(&hdr->signature);
+ cpu_to_le32s(&hdr->checksum);
+ cpu_to_le32s(&hdr->entry_count);
+}
+
+void vhdx_region_entry_le_import(VHDXRegionTableEntry *e)
+{
+ assert(e != NULL);
+
+ leguid_to_cpus(&e->guid);
+ le64_to_cpus(&e->file_offset);
+ le32_to_cpus(&e->length);
+ le32_to_cpus(&e->data_bits);
+}
+
+void vhdx_region_entry_le_export(VHDXRegionTableEntry *e)
+{
+ assert(e != NULL);
+
+ cpu_to_leguids(&e->guid);
+ cpu_to_le64s(&e->file_offset);
+ cpu_to_le32s(&e->length);
+ cpu_to_le32s(&e->data_bits);
+}
+
+
+/* Metadata headers & table */
+void vhdx_metadata_header_le_import(VHDXMetadataTableHeader *hdr)
+{
+ assert(hdr != NULL);
+
+ le64_to_cpus(&hdr->signature);
+ le16_to_cpus(&hdr->entry_count);
+}
+
+void vhdx_metadata_header_le_export(VHDXMetadataTableHeader *hdr)
+{
+ assert(hdr != NULL);
+
+ cpu_to_le64s(&hdr->signature);
+ cpu_to_le16s(&hdr->entry_count);
+}
+
+void vhdx_metadata_entry_le_import(VHDXMetadataTableEntry *e)
+{
+ assert(e != NULL);
+
+ leguid_to_cpus(&e->item_id);
+ le32_to_cpus(&e->offset);
+ le32_to_cpus(&e->length);
+ le32_to_cpus(&e->data_bits);
+}
+void vhdx_metadata_entry_le_export(VHDXMetadataTableEntry *e)
+{
+ assert(e != NULL);
+
+ cpu_to_leguids(&e->item_id);
+ cpu_to_le32s(&e->offset);
+ cpu_to_le32s(&e->length);
+ cpu_to_le32s(&e->data_bits);
+}
Code Review / kvmfornfv.git / blobdiff