#ifndef BLOCK_VHDX_H
#define BLOCK_VHDX_H
+#define KiB (1 * 1024)
+#define MiB (KiB * 1024)
+#define GiB (MiB * 1024)
+#define TiB ((uint64_t) GiB * 1024)
+
+#define DEFAULT_LOG_SIZE 1048576 /* 1MiB */
/* Structures and fields present in the VHDX file */
/* The header section has the following blocks,
#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_REGION_TABLE2_OFFSET (VHDX_HEADER_BLOCK_SIZE * 4)
-
+#define VHDX_HEADER_SECTION_END (1 * MiB)
/*
* A note on the use of MS-GUID fields. For more details on the GUID,
* please see: https://en.wikipedia.org/wiki/Globally_unique_identifier.
/* These structures are ones that are defined in the VHDX specification
* document */
+#define VHDX_FILE_SIGNATURE 0x656C696678646876ULL /* "vhdxfile" in ASCII */
typedef struct VHDXFileIdentifier {
uint64_t signature; /* "vhdxfile" in ASCII */
uint16_t creator[256]; /* optional; utf-16 string to identify
- the vhdx file creator. Diagnotistic
+ the vhdx file creator. Diagnostic
only */
} VHDXFileIdentifier;
/* 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,
* not just the defined portion of it */
+#define VHDX_HEADER_SIGNATURE 0x64616568
typedef struct QEMU_PACKED VHDXHeader {
uint32_t signature; /* "head" in ASCII */
uint32_t checksum; /* CRC-32C hash of the whole header */
there is no valid log. If non-zero,
log entries with this guid are
valid. */
- uint16_t log_version; /* version of the log format. Mustn't be
- zero, unless log_guid is also zero */
+ uint16_t log_version; /* version of the log format. Must be
+ set to zero */
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
} VHDXHeader;
/* Header for the region table block */
+#define VHDX_REGION_SIGNATURE 0x69676572 /* "regi" in ASCII */
typedef struct QEMU_PACKED VHDXRegionTableHeader {
uint32_t signature; /* "regi" in ASCII */
uint32_t checksum; /* CRC-32C hash of the 64KB table */
#define PAYLOAD_BLOCK_UNDEFINED 1
#define PAYLOAD_BLOCK_ZERO 2
#define PAYLOAD_BLOCK_UNMAPPED 5
-#define PAYLOAD_BLOCK_FULL_PRESENT 6
+#define PAYLOAD_BLOCK_FULLY_PRESENT 6
#define PAYLOAD_BLOCK_PARTIALLY_PRESENT 7
#define SB_BLOCK_NOT_PRESENT 0
/* 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_MASK 0xFFFFFFFFFFF00000ULL /* upper 44 bits */
typedef uint64_t VHDXBatEntry;
/* ---- METADATA REGION STRUCTURES ---- */
#define VHDX_METADATA_MAX_ENTRIES 2047 /* not including the header */
#define VHDX_METADATA_TABLE_MAX_SIZE \
(VHDX_METADATA_ENTRY_SIZE * (VHDX_METADATA_MAX_ENTRIES+1))
+#define VHDX_METADATA_SIGNATURE 0x617461646174656DULL /* "metadata" in ASCII */
typedef struct QEMU_PACKED VHDXMetadataTableHeader {
uint64_t signature; /* "metadata" in ASCII */
uint16_t reserved;
If set indicates a fixed
size VHDX file */
#define VHDX_PARAMS_HAS_PARENT 0x02 /* has parent / backing file */
+#define VHDX_BLOCK_SIZE_MIN (1 * MiB)
+#define VHDX_BLOCK_SIZE_MAX (256 * MiB)
typedef struct QEMU_PACKED VHDXFileParameters {
uint32_t block_size; /* size of each payload block, always
power of 2, <= 256MB and >= 1MB. */
the rest are reserved (see above) */
} VHDXFileParameters;
+#define VHDX_MAX_IMAGE_SIZE ((uint64_t) 64 * TiB)
typedef struct QEMU_PACKED VHDXVirtualDiskSize {
uint64_t virtual_disk_size; /* Size of the virtual disk, in bytes.
Must be multiple of the sector size,
} VHDXVirtualDiskSize;
typedef struct QEMU_PACKED VHDXPage83Data {
- MSGUID page_83_data[16]; /* unique id for scsi devices that
+ MSGUID page_83_data; /* unique id for scsi devices that
support page 0x83 */
} VHDXPage83Data;
} VHDXVirtualDiskPhysicalSectorSize;
typedef struct QEMU_PACKED VHDXParentLocatorHeader {
- MSGUID locator_type[16]; /* type of the parent virtual disk. */
+ MSGUID locator_type; /* type of the parent virtual disk. */
uint16_t reserved;
uint16_t key_value_count; /* number of key/value pairs for this
locator */
typedef struct VHDXLogEntries {
uint64_t offset;
uint64_t length;
- uint32_t head;
+ uint32_t write;
+ uint32_t read;
+ VHDXLogEntryHeader *hdr;
+ void *desc_buffer;
+ uint64_t sequence;
uint32_t tail;
} VHDXLogEntries;
+typedef struct VHDXRegionEntry {
+ uint64_t start;
+ uint64_t end;
+ QLIST_ENTRY(VHDXRegionEntry) entries;
+} VHDXRegionEntry;
+
typedef struct BDRVVHDXState {
CoMutex lock;
VHDXParentLocatorEntry *parent_entries;
Error *migration_blocker;
+
+ bool log_replayed_on_open;
+
+ QLIST_HEAD(VHDXRegionHead, VHDXRegionEntry) regions;
} BDRVVHDXState;
void vhdx_guid_generate(MSGUID *guid);
bool vhdx_checksum_is_valid(uint8_t *buf, size_t size, int crc_offset);
+int vhdx_parse_log(BlockDriverState *bs, BDRVVHDXState *s, bool *flushed,
+ Error **errp);
+
+int vhdx_log_write_and_flush(BlockDriverState *bs, BDRVVHDXState *s,
+ void *data, uint32_t length, uint64_t offset);
static inline void leguid_to_cpus(MSGUID *guid)
{
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_import(VHDXLogDataSector *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);
-
+void vhdx_region_header_le_import(VHDXRegionTableHeader *hdr);
+void vhdx_region_header_le_export(VHDXRegionTableHeader *hdr);
+void vhdx_region_entry_le_import(VHDXRegionTableEntry *e);
+void vhdx_region_entry_le_export(VHDXRegionTableEntry *e);
+void vhdx_metadata_header_le_import(VHDXMetadataTableHeader *hdr);
+void vhdx_metadata_header_le_export(VHDXMetadataTableHeader *hdr);
+void vhdx_metadata_entry_le_import(VHDXMetadataTableEntry *e);
+void vhdx_metadata_entry_le_export(VHDXMetadataTableEntry *e);
int vhdx_user_visible_write(BlockDriverState *bs, BDRVVHDXState *s);
#endif
projects / qemu.git / blobdiff