* Authors:
*
- * This is based on the "VHDX Format Specification v0.95", published 4/12/2012
+ * 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=29681
+ * 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.
* 0.........64KB...........128KB........192KB..........256KB................1MB
*/
-#define VHDX_HEADER_BLOCK_SIZE (64*1024)
+#define VHDX_HEADER_BLOCK_SIZE (64 * 1024)
#define VHDX_FILE_ID_OFFSET 0
-#define VHDX_HEADER1_OFFSET (VHDX_HEADER_BLOCK_SIZE*1)
-#define VHDX_HEADER2_OFFSET (VHDX_HEADER_BLOCK_SIZE*2)
-#define VHDX_REGION_TABLE_OFFSET (VHDX_HEADER_BLOCK_SIZE*3)
+#define VHDX_HEADER1_OFFSET (VHDX_HEADER_BLOCK_SIZE * 1)
+#define VHDX_HEADER2_OFFSET (VHDX_HEADER_BLOCK_SIZE * 2)
+#define VHDX_REGION_TABLE_OFFSET (VHDX_HEADER_BLOCK_SIZE * 3)
/*
* Microsoft is not just 16 bytes though - it is a structure that is defined,
* so we need to follow it here so that endianness does not trip us up */
-typedef struct MSGUID {
+typedef struct QEMU_PACKED MSGUID {
uint32_t data1;
uint16_t data2;
uint16_t data3;
#define guid_eq(a, b) \
(memcmp(&(a), &(b), sizeof(MSGUID)) == 0)
-#define VHDX_HEADER_SIZE (4*1024) /* although the vhdx_header struct in disk
- is only 582 bytes, for purposes of crc
- the header is the first 4KB of the 64KB
- block */
+#define VHDX_HEADER_SIZE (4 * 1024) /* although the vhdx_header struct in disk
+ is only 582 bytes, for purposes of crc
+ the header is the first 4KB of the 64KB
+ block */
/* The full header is 4KB, although the actual header data is much smaller.
* But for the checksum calculation, it is over the entire 4KB structure,
VHDX file has 2 of these headers,
and only the header with the highest
sequence number is valid */
- MSGUID file_write_guid; /* 128 bit unique identifier. Must be
+ MSGUID file_write_guid; /* 128 bit unique identifier. Must be
updated to new, unique value before
the first modification is made to
file */
valid. */
uint16_t log_version; /* version of the log format. Mustn't be
zero, unless log_guid is also zero */
- uint16_t version; /* version of th evhdx file. Currently,
+ uint16_t version; /* version of the vhdx file. Currently,
only supported version is "1" */
uint32_t log_length; /* length of the log. Must be multiple
of 1MB */
/* ---- LOG ENTRY STRUCTURES ---- */
+#define VHDX_LOG_MIN_SIZE (1024 * 1024)
+#define VHDX_LOG_SECTOR_SIZE 4096
#define VHDX_LOG_HDR_SIZE 64
+#define VHDX_LOG_SIGNATURE 0x65676f6c
typedef struct QEMU_PACKED VHDXLogEntryHeader {
uint32_t signature; /* "loge" in ASCII */
uint32_t checksum; /* CRC-32C hash of the 64KB table */
vhdx_header. If not found in
vhdx_header, it is invalid */
uint64_t flushed_file_offset; /* see spec for full details - this
- sould be vhdx file size in bytes */
+ should be vhdx file size in bytes */
uint64_t last_file_offset; /* size in bytes that all allocated
file structures fit into */
} VHDXLogEntryHeader;
#define VHDX_LOG_DESC_SIZE 32
-
+#define VHDX_LOG_DESC_SIGNATURE 0x63736564
+#define VHDX_LOG_ZERO_SIGNATURE 0x6f72657a
typedef struct QEMU_PACKED VHDXLogDescriptor {
uint32_t signature; /* "zero" or "desc" in ASCII */
union {
vhdx_log_entry_header */
} VHDXLogDescriptor;
+#define VHDX_LOG_DATA_SIGNATURE 0x61746164
typedef struct QEMU_PACKED VHDXLogDataSector {
uint32_t data_signature; /* "data" in ASCII */
uint32_t sequence_high; /* 4 MSB of 8 byte sequence_number */
#define SB_BLOCK_PRESENT 6
/* per the spec */
-#define VHDX_MAX_SECTORS_PER_BLOCK (1<<23)
+#define VHDX_MAX_SECTORS_PER_BLOCK (1 << 23)
/* upper 44 bits are the file offset in 1MB units lower 3 bits are the state
other bits are reserved */
#define VHDX_BAT_STATE_BIT_MASK 0x07
-#define VHDX_BAT_FILE_OFF_BITS (64-44)
+#define VHDX_BAT_FILE_OFF_BITS (64 - 44)
typedef uint64_t VHDXBatEntry;
/* ---- METADATA REGION STRUCTURES ---- */
metadata region */
/* note: if length = 0, so is offset */
uint32_t length; /* length of metadata. <= 1MB. */
- uint32_t data_bits; /* least-significant 3 bits are flags, the
- rest are reserved (see above) */
+ uint32_t data_bits; /* least-significant 3 bits are flags,
+ the rest are reserved (see above) */
uint32_t reserved2;
} VHDXMetadataTableEntry;
typedef struct QEMU_PACKED VHDXFileParameters {
uint32_t block_size; /* size of each payload block, always
power of 2, <= 256MB and >= 1MB. */
- uint32_t data_bits; /* least-significant 2 bits are flags, the rest
- are reserved (see above) */
+ uint32_t data_bits; /* least-significant 2 bits are flags,
+ the rest are reserved (see above) */
} VHDXFileParameters;
typedef struct QEMU_PACKED VHDXVirtualDiskSize {
/* ----- END VHDX SPECIFICATION STRUCTURES ---- */
+typedef struct VHDXMetadataEntries {
+ VHDXMetadataTableEntry file_parameters_entry;
+ VHDXMetadataTableEntry virtual_disk_size_entry;
+ VHDXMetadataTableEntry page83_data_entry;
+ VHDXMetadataTableEntry logical_sector_size_entry;
+ VHDXMetadataTableEntry phys_sector_size_entry;
+ VHDXMetadataTableEntry parent_locator_entry;
+ uint16_t present;
+} VHDXMetadataEntries;
+
+typedef struct VHDXLogEntries {
+ uint64_t offset;
+ uint64_t length;
+ uint32_t head;
+ uint32_t tail;
+} VHDXLogEntries;
+
+typedef struct BDRVVHDXState {
+ CoMutex lock;
+
+ int curr_header;
+ VHDXHeader *headers[2];
+
+ VHDXRegionTableHeader rt;
+ VHDXRegionTableEntry bat_rt; /* region table for the BAT */
+ VHDXRegionTableEntry metadata_rt; /* region table for the metadata */
+
+ VHDXMetadataTableHeader metadata_hdr;
+ VHDXMetadataEntries metadata_entries;
+
+ VHDXFileParameters params;
+ uint32_t block_size;
+ uint32_t block_size_bits;
+ uint32_t sectors_per_block;
+ uint32_t sectors_per_block_bits;
+
+ uint64_t virtual_disk_size;
+ uint32_t logical_sector_size;
+ uint32_t physical_sector_size;
+
+ uint64_t chunk_ratio;
+ uint32_t chunk_ratio_bits;
+ uint32_t logical_sector_size_bits;
+
+ uint32_t bat_entries;
+ VHDXBatEntry *bat;
+ uint64_t bat_offset;
+ MSGUID session_guid;
+
+ VHDXLogEntries log;
+
+ VHDXParentLocatorHeader parent_header;
+ VHDXParentLocatorEntry *parent_entries;
+
+ Error *migration_blocker;
+} BDRVVHDXState;
+
+void vhdx_guid_generate(MSGUID *guid);
+
+uint32_t vhdx_update_checksum(uint8_t *buf, size_t size, int crc_offset);
uint32_t vhdx_checksum_calc(uint32_t crc, uint8_t *buf, size_t size,
int crc_offset);
bool vhdx_checksum_is_valid(uint8_t *buf, size_t size, int crc_offset);
-static void leguid_to_cpus(MSGUID *guid)
+static inline void leguid_to_cpus(MSGUID *guid)
{
le32_to_cpus(&guid->data1);
le16_to_cpus(&guid->data2);
le16_to_cpus(&guid->data3);
}
+static inline void cpu_to_leguids(MSGUID *guid)
+{
+ cpu_to_le32s(&guid->data1);
+ cpu_to_le16s(&guid->data2);
+ cpu_to_le16s(&guid->data3);
+}
+
+void vhdx_header_le_import(VHDXHeader *h);
+void vhdx_header_le_export(VHDXHeader *orig_h, VHDXHeader *new_h);
+void vhdx_log_desc_le_import(VHDXLogDescriptor *d);
+void vhdx_log_desc_le_export(VHDXLogDescriptor *d);
+void vhdx_log_data_le_export(VHDXLogDataSector *d);
+void vhdx_log_entry_hdr_le_import(VHDXLogEntryHeader *hdr);
+void vhdx_log_entry_hdr_le_export(VHDXLogEntryHeader *hdr);
+
#endif
projects / qemu.git / blobdiff