From 093d7857b517802e9745716c5f7ba468639104cf Mon Sep 17 00:00:00 2001 From: Jeffrey Cody Date: Thu, 10 Jul 2014 23:24:15 +0200 Subject: [PATCH 15/44] block: vhdx - log support struct and defines RH-Author: Jeffrey Cody Message-id: <311041c9d95087c150141de950c4024c81a9dc3a.1405033137.git.jcody@redhat.com> Patchwork-id: 59751 O-Subject: [RHEL6-6 qemu-kvm PATCH v2 06/24] block: vhdx - log support struct and defines Bugzilla: 1063559 RH-Acked-by: Stefan Hajnoczi RH-Acked-by: Fam Zheng RH-Acked-by: Markus Armbruster 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 Signed-off-by: Stefan Hajnoczi (cherry picked from commit 625565d27e8d7c7f7238ccd118a2cd49c1c52963) --- block/vhdx.h | 46 ++++++++++++++++++++++++++++++---------------- 1 file changed, 30 insertions(+), 16 deletions(-) Signed-off-by: Miroslav Rezanina --- block/vhdx.h | 46 ++++++++++++++++++++++++++++++---------------- 1 files changed, 30 insertions(+), 16 deletions(-) diff --git a/block/vhdx.h b/block/vhdx.h index d1fd58a..ba2bbae 100644 --- a/block/vhdx.h +++ b/block/vhdx.h @@ -35,12 +35,12 @@ * 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) /* @@ -82,10 +82,10 @@ typedef struct QEMU_PACKED MSGUID { #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, @@ -97,7 +97,7 @@ typedef struct QEMU_PACKED VHDXHeader { 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 */ @@ -156,7 +156,10 @@ 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 */ @@ -179,7 +182,8 @@ 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 { @@ -199,6 +203,7 @@ 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 */ @@ -224,12 +229,12 @@ typedef struct QEMU_PACKED VHDXLogDataSector { #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 ---- */ @@ -257,8 +262,8 @@ 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; @@ -272,8 +277,8 @@ 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 { @@ -325,6 +330,13 @@ 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; @@ -358,6 +370,8 @@ typedef struct BDRVVHDXState { MSGUID session_guid; + VHDXLogEntries log; + VHDXParentLocatorHeader parent_header; VHDXParentLocatorEntry *parent_entries; -- 1.7.1