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