This adds some magic number defines, and internal structure definitions for VHDX log replay support.
Signed-off-by: Jeff Cody <jc...@redhat.com> --- block/vhdx.h | 21 ++++++++++++++++++++- 1 file changed, 20 insertions(+), 1 deletion(-) diff --git a/block/vhdx.h b/block/vhdx.h index c8d8593..2db6615 100644 --- a/block/vhdx.h +++ b/block/vhdx.h @@ -151,7 +151,10 @@ typedef struct QEMU_PACKED VHDXRegionTableEntry { /* ---- 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 */ @@ -174,7 +177,8 @@ typedef struct QEMU_PACKED VHDXLogEntryHeader { } 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 { @@ -194,6 +198,7 @@ typedef struct QEMU_PACKED VHDXLogDescriptor { 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 */ @@ -318,6 +323,18 @@ typedef struct VHDXMetadataEntries { uint16_t present; } VHDXMetadataEntries; +typedef struct VHDXLogEntries { + uint64_t offset; + uint64_t length; + uint32_t head; + uint32_t tail; +} VHDXLogEntries; + +typedef struct VHDXLogEntryInfo { + uint64_t sector_start; + uint32_t desc_count; +} VHDXLogEntryInfo; + typedef struct BDRVVHDXState { CoMutex lock; @@ -351,6 +368,8 @@ typedef struct BDRVVHDXState { MSGUID session_guid; + VHDXLogEntries log; + VHDXParentLocatorHeader parent_header; VHDXParentLocatorEntry *parent_entries; -- 1.8.1.4