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/*
* 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/osdep.h"
#include "block/block_int.h"
#include "qemu/bswap.h"
#include "vhdx.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);
h->signature = le32_to_cpu(h->signature);
h->checksum = le32_to_cpu(h->checksum);
h->sequence_number = le64_to_cpu(h->sequence_number);
leguid_to_cpus(&h->file_write_guid);
leguid_to_cpus(&h->data_write_guid);
leguid_to_cpus(&h->log_guid);
h->log_version = le16_to_cpu(h->log_version);
h->version = le16_to_cpu(h->version);
h->log_length = le32_to_cpu(h->log_length);
h->log_offset = le64_to_cpu(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);
d->signature = le32_to_cpu(d->signature);
d->file_offset = le64_to_cpu(d->file_offset);
d->sequence_number = le64_to_cpu(d->sequence_number);
}
void vhdx_log_desc_le_export(VHDXLogDescriptor *d)
{
assert(d != NULL);
d->signature = cpu_to_le32(d->signature);
d->trailing_bytes = cpu_to_le32(d->trailing_bytes);
d->leading_bytes = cpu_to_le64(d->leading_bytes);
d->file_offset = cpu_to_le64(d->file_offset);
d->sequence_number = cpu_to_le64(d->sequence_number);
}
void vhdx_log_data_le_import(VHDXLogDataSector *d)
{
assert(d != NULL);
d->data_signature = le32_to_cpu(d->data_signature);
d->sequence_high = le32_to_cpu(d->sequence_high);
d->sequence_low = le32_to_cpu(d->sequence_low);
}
void vhdx_log_data_le_export(VHDXLogDataSector *d)
{
assert(d != NULL);
d->data_signature = cpu_to_le32(d->data_signature);
d->sequence_high = cpu_to_le32(d->sequence_high);
d->sequence_low = cpu_to_le32(d->sequence_low);
}
void vhdx_log_entry_hdr_le_import(VHDXLogEntryHeader *hdr)
{
assert(hdr != NULL);
hdr->signature = le32_to_cpu(hdr->signature);
hdr->checksum = le32_to_cpu(hdr->checksum);
hdr->entry_length = le32_to_cpu(hdr->entry_length);
hdr->tail = le32_to_cpu(hdr->tail);
hdr->sequence_number = le64_to_cpu(hdr->sequence_number);
hdr->descriptor_count = le32_to_cpu(hdr->descriptor_count);
leguid_to_cpus(&hdr->log_guid);
hdr->flushed_file_offset = le64_to_cpu(hdr->flushed_file_offset);
hdr->last_file_offset = le64_to_cpu(hdr->last_file_offset);
}
void vhdx_log_entry_hdr_le_export(VHDXLogEntryHeader *hdr)
{
assert(hdr != NULL);
hdr->signature = cpu_to_le32(hdr->signature);
hdr->checksum = cpu_to_le32(hdr->checksum);
hdr->entry_length = cpu_to_le32(hdr->entry_length);
hdr->tail = cpu_to_le32(hdr->tail);
hdr->sequence_number = cpu_to_le64(hdr->sequence_number);
hdr->descriptor_count = cpu_to_le32(hdr->descriptor_count);
cpu_to_leguids(&hdr->log_guid);
hdr->flushed_file_offset = cpu_to_le64(hdr->flushed_file_offset);
hdr->last_file_offset = cpu_to_le64(hdr->last_file_offset);
}
/* Region table entries */
void vhdx_region_header_le_import(VHDXRegionTableHeader *hdr)
{
assert(hdr != NULL);
hdr->signature = le32_to_cpu(hdr->signature);
hdr->checksum = le32_to_cpu(hdr->checksum);
hdr->entry_count = le32_to_cpu(hdr->entry_count);
}
void vhdx_region_header_le_export(VHDXRegionTableHeader *hdr)
{
assert(hdr != NULL);
hdr->signature = cpu_to_le32(hdr->signature);
hdr->checksum = cpu_to_le32(hdr->checksum);
hdr->entry_count = cpu_to_le32(hdr->entry_count);
}
void vhdx_region_entry_le_import(VHDXRegionTableEntry *e)
{
assert(e != NULL);
leguid_to_cpus(&e->guid);
e->file_offset = le64_to_cpu(e->file_offset);
e->length = le32_to_cpu(e->length);
e->data_bits = le32_to_cpu(e->data_bits);
}
void vhdx_region_entry_le_export(VHDXRegionTableEntry *e)
{
assert(e != NULL);
cpu_to_leguids(&e->guid);
e->file_offset = cpu_to_le64(e->file_offset);
e->length = cpu_to_le32(e->length);
e->data_bits = cpu_to_le32(e->data_bits);
}
/* Metadata headers & table */
void vhdx_metadata_header_le_import(VHDXMetadataTableHeader *hdr)
{
assert(hdr != NULL);
hdr->signature = le64_to_cpu(hdr->signature);
hdr->entry_count = le16_to_cpu(hdr->entry_count);
}
void vhdx_metadata_header_le_export(VHDXMetadataTableHeader *hdr)
{
assert(hdr != NULL);
hdr->signature = cpu_to_le64(hdr->signature);
hdr->entry_count = cpu_to_le16(hdr->entry_count);
}
void vhdx_metadata_entry_le_import(VHDXMetadataTableEntry *e)
{
assert(e != NULL);
leguid_to_cpus(&e->item_id);
e->offset = le32_to_cpu(e->offset);
e->length = le32_to_cpu(e->length);
e->data_bits = le32_to_cpu(e->data_bits);
}
void vhdx_metadata_entry_le_export(VHDXMetadataTableEntry *e)
{
assert(e != NULL);
cpu_to_leguids(&e->item_id);
e->offset = cpu_to_le32(e->offset);
e->length = cpu_to_le32(e->length);
e->data_bits = cpu_to_le32(e->data_bits);
}
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