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block: vhdx - log support struct and defines

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This adds some magic number defines, and internal structure definitions
for VHDX log replay support.  The struct VHDXLogEntries does not reflect
an on-disk data structure, and thus does not need to be packed.

Some minor code style fixes are applied as well.

Signed-off-by: Jeff Cody <jcody@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Jeff Cody 2013-10-30 10:44:41 -04:00 committed by Stefan Hajnoczi
parent 28541d4628
commit 625565d27e
1 changed files with 30 additions and 16 deletions
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24
block/vhdx.h
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@ -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 */
@ -252,8 +257,8 @@ typedef struct QEMU_PACKED VHDXMetadataTableEntry {
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;
@ -265,8 +270,8 @@ typedef struct QEMU_PACKED 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 {
@ -318,6 +323,13 @@ 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 BDRVVHDXState {
CoMutex lock;
@ -351,6 +363,8 @@ typedef struct BDRVVHDXState {
MSGUID session_guid;
VHDXLogEntries log;
VHDXParentLocatorHeader parent_header;
VHDXParentLocatorEntry *parent_entries;