Jeff Cody | 0f48e8f | 2013-10-30 10:44:42 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Block driver for Hyper-V VHDX Images |
| 3 | * |
| 4 | * Copyright (c) 2013 Red Hat, Inc., |
| 5 | * |
| 6 | * Authors: |
| 7 | * Jeff Cody <jcody@redhat.com> |
| 8 | * |
| 9 | * This is based on the "VHDX Format Specification v1.00", published 8/25/2012 |
| 10 | * by Microsoft: |
| 11 | * https://www.microsoft.com/en-us/download/details.aspx?id=34750 |
| 12 | * |
| 13 | * This work is licensed under the terms of the GNU LGPL, version 2 or later. |
| 14 | * See the COPYING.LIB file in the top-level directory. |
| 15 | * |
| 16 | */ |
| 17 | |
Peter Maydell | 80c71a2 | 2016-01-18 18:01:42 +0000 | [diff] [blame] | 18 | #include "qemu/osdep.h" |
Jeff Cody | 0f48e8f | 2013-10-30 10:44:42 -0400 | [diff] [blame] | 19 | #include "qemu-common.h" |
| 20 | #include "block/block_int.h" |
Paolo Bonzini | 58369e2 | 2016-03-15 17:22:36 +0100 | [diff] [blame] | 21 | #include "qemu/bswap.h" |
Jeff Cody | 0f48e8f | 2013-10-30 10:44:42 -0400 | [diff] [blame] | 22 | #include "block/vhdx.h" |
| 23 | |
Jeff Cody | 0f48e8f | 2013-10-30 10:44:42 -0400 | [diff] [blame] | 24 | /* |
| 25 | * All the VHDX formats on disk are little endian - the following |
| 26 | * are helper import/export functions to correctly convert |
| 27 | * endianness from disk read to native cpu format, and back again. |
| 28 | */ |
| 29 | |
| 30 | |
| 31 | /* VHDX File Header */ |
| 32 | |
| 33 | |
| 34 | void vhdx_header_le_import(VHDXHeader *h) |
| 35 | { |
| 36 | assert(h != NULL); |
| 37 | |
| 38 | le32_to_cpus(&h->signature); |
| 39 | le32_to_cpus(&h->checksum); |
| 40 | le64_to_cpus(&h->sequence_number); |
| 41 | |
| 42 | leguid_to_cpus(&h->file_write_guid); |
| 43 | leguid_to_cpus(&h->data_write_guid); |
| 44 | leguid_to_cpus(&h->log_guid); |
| 45 | |
| 46 | le16_to_cpus(&h->log_version); |
| 47 | le16_to_cpus(&h->version); |
| 48 | le32_to_cpus(&h->log_length); |
| 49 | le64_to_cpus(&h->log_offset); |
| 50 | } |
| 51 | |
| 52 | void vhdx_header_le_export(VHDXHeader *orig_h, VHDXHeader *new_h) |
| 53 | { |
| 54 | assert(orig_h != NULL); |
| 55 | assert(new_h != NULL); |
| 56 | |
| 57 | new_h->signature = cpu_to_le32(orig_h->signature); |
| 58 | new_h->checksum = cpu_to_le32(orig_h->checksum); |
| 59 | new_h->sequence_number = cpu_to_le64(orig_h->sequence_number); |
| 60 | |
| 61 | new_h->file_write_guid = orig_h->file_write_guid; |
| 62 | new_h->data_write_guid = orig_h->data_write_guid; |
| 63 | new_h->log_guid = orig_h->log_guid; |
| 64 | |
| 65 | cpu_to_leguids(&new_h->file_write_guid); |
| 66 | cpu_to_leguids(&new_h->data_write_guid); |
| 67 | cpu_to_leguids(&new_h->log_guid); |
| 68 | |
| 69 | new_h->log_version = cpu_to_le16(orig_h->log_version); |
| 70 | new_h->version = cpu_to_le16(orig_h->version); |
| 71 | new_h->log_length = cpu_to_le32(orig_h->log_length); |
| 72 | new_h->log_offset = cpu_to_le64(orig_h->log_offset); |
| 73 | } |
| 74 | |
| 75 | |
| 76 | /* VHDX Log Headers */ |
| 77 | |
| 78 | |
| 79 | void vhdx_log_desc_le_import(VHDXLogDescriptor *d) |
| 80 | { |
| 81 | assert(d != NULL); |
| 82 | |
| 83 | le32_to_cpus(&d->signature); |
Jeff Cody | 0f48e8f | 2013-10-30 10:44:42 -0400 | [diff] [blame] | 84 | le64_to_cpus(&d->file_offset); |
| 85 | le64_to_cpus(&d->sequence_number); |
| 86 | } |
| 87 | |
| 88 | void vhdx_log_desc_le_export(VHDXLogDescriptor *d) |
| 89 | { |
| 90 | assert(d != NULL); |
| 91 | |
| 92 | cpu_to_le32s(&d->signature); |
| 93 | cpu_to_le32s(&d->trailing_bytes); |
| 94 | cpu_to_le64s(&d->leading_bytes); |
| 95 | cpu_to_le64s(&d->file_offset); |
| 96 | cpu_to_le64s(&d->sequence_number); |
| 97 | } |
| 98 | |
Jeff Cody | 4f75b52 | 2014-08-06 15:54:58 -0400 | [diff] [blame] | 99 | void vhdx_log_data_le_import(VHDXLogDataSector *d) |
| 100 | { |
| 101 | assert(d != NULL); |
| 102 | |
| 103 | le32_to_cpus(&d->data_signature); |
| 104 | le32_to_cpus(&d->sequence_high); |
| 105 | le32_to_cpus(&d->sequence_low); |
| 106 | } |
| 107 | |
Jeff Cody | 0f48e8f | 2013-10-30 10:44:42 -0400 | [diff] [blame] | 108 | void vhdx_log_data_le_export(VHDXLogDataSector *d) |
| 109 | { |
| 110 | assert(d != NULL); |
| 111 | |
| 112 | cpu_to_le32s(&d->data_signature); |
| 113 | cpu_to_le32s(&d->sequence_high); |
| 114 | cpu_to_le32s(&d->sequence_low); |
| 115 | } |
| 116 | |
| 117 | void vhdx_log_entry_hdr_le_import(VHDXLogEntryHeader *hdr) |
| 118 | { |
| 119 | assert(hdr != NULL); |
| 120 | |
| 121 | le32_to_cpus(&hdr->signature); |
| 122 | le32_to_cpus(&hdr->checksum); |
| 123 | le32_to_cpus(&hdr->entry_length); |
| 124 | le32_to_cpus(&hdr->tail); |
| 125 | le64_to_cpus(&hdr->sequence_number); |
| 126 | le32_to_cpus(&hdr->descriptor_count); |
| 127 | leguid_to_cpus(&hdr->log_guid); |
| 128 | le64_to_cpus(&hdr->flushed_file_offset); |
| 129 | le64_to_cpus(&hdr->last_file_offset); |
| 130 | } |
| 131 | |
| 132 | void vhdx_log_entry_hdr_le_export(VHDXLogEntryHeader *hdr) |
| 133 | { |
| 134 | assert(hdr != NULL); |
| 135 | |
| 136 | cpu_to_le32s(&hdr->signature); |
| 137 | cpu_to_le32s(&hdr->checksum); |
| 138 | cpu_to_le32s(&hdr->entry_length); |
| 139 | cpu_to_le32s(&hdr->tail); |
| 140 | cpu_to_le64s(&hdr->sequence_number); |
| 141 | cpu_to_le32s(&hdr->descriptor_count); |
| 142 | cpu_to_leguids(&hdr->log_guid); |
| 143 | cpu_to_le64s(&hdr->flushed_file_offset); |
| 144 | cpu_to_le64s(&hdr->last_file_offset); |
| 145 | } |
| 146 | |
| 147 | |
Jeff Cody | c325ee1 | 2013-10-30 10:44:50 -0400 | [diff] [blame] | 148 | /* Region table entries */ |
| 149 | void vhdx_region_header_le_import(VHDXRegionTableHeader *hdr) |
| 150 | { |
| 151 | assert(hdr != NULL); |
| 152 | |
| 153 | le32_to_cpus(&hdr->signature); |
| 154 | le32_to_cpus(&hdr->checksum); |
| 155 | le32_to_cpus(&hdr->entry_count); |
| 156 | } |
| 157 | |
| 158 | void vhdx_region_header_le_export(VHDXRegionTableHeader *hdr) |
| 159 | { |
| 160 | assert(hdr != NULL); |
| 161 | |
| 162 | cpu_to_le32s(&hdr->signature); |
| 163 | cpu_to_le32s(&hdr->checksum); |
| 164 | cpu_to_le32s(&hdr->entry_count); |
| 165 | } |
| 166 | |
| 167 | void vhdx_region_entry_le_import(VHDXRegionTableEntry *e) |
| 168 | { |
| 169 | assert(e != NULL); |
| 170 | |
| 171 | leguid_to_cpus(&e->guid); |
| 172 | le64_to_cpus(&e->file_offset); |
| 173 | le32_to_cpus(&e->length); |
| 174 | le32_to_cpus(&e->data_bits); |
| 175 | } |
| 176 | |
| 177 | void vhdx_region_entry_le_export(VHDXRegionTableEntry *e) |
| 178 | { |
| 179 | assert(e != NULL); |
| 180 | |
| 181 | cpu_to_leguids(&e->guid); |
| 182 | cpu_to_le64s(&e->file_offset); |
| 183 | cpu_to_le32s(&e->length); |
| 184 | cpu_to_le32s(&e->data_bits); |
| 185 | } |
| 186 | |
| 187 | |
| 188 | /* Metadata headers & table */ |
| 189 | void vhdx_metadata_header_le_import(VHDXMetadataTableHeader *hdr) |
| 190 | { |
| 191 | assert(hdr != NULL); |
| 192 | |
| 193 | le64_to_cpus(&hdr->signature); |
| 194 | le16_to_cpus(&hdr->entry_count); |
| 195 | } |
| 196 | |
| 197 | void vhdx_metadata_header_le_export(VHDXMetadataTableHeader *hdr) |
| 198 | { |
| 199 | assert(hdr != NULL); |
| 200 | |
| 201 | cpu_to_le64s(&hdr->signature); |
| 202 | cpu_to_le16s(&hdr->entry_count); |
| 203 | } |
| 204 | |
| 205 | void vhdx_metadata_entry_le_import(VHDXMetadataTableEntry *e) |
| 206 | { |
| 207 | assert(e != NULL); |
| 208 | |
| 209 | leguid_to_cpus(&e->item_id); |
| 210 | le32_to_cpus(&e->offset); |
| 211 | le32_to_cpus(&e->length); |
| 212 | le32_to_cpus(&e->data_bits); |
| 213 | } |
| 214 | void vhdx_metadata_entry_le_export(VHDXMetadataTableEntry *e) |
| 215 | { |
| 216 | assert(e != NULL); |
| 217 | |
| 218 | cpu_to_leguids(&e->item_id); |
| 219 | cpu_to_le32s(&e->offset); |
| 220 | cpu_to_le32s(&e->length); |
| 221 | cpu_to_le32s(&e->data_bits); |
| 222 | } |