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From a60094cdc27c9913ad93fc42383161ed40015e44 Mon Sep 17 00:00:00 2001
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From: Jeffrey Cody <jcody@redhat.com>
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Date: Wed, 20 Nov 2013 19:43:53 +0100
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Subject: [PATCH 10/25] block: vhdx - log support struct and defines
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RH-Author: Jeffrey Cody <jcody@redhat.com>
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Message-id: <2dae7f05c8661b506f3bbaa60cd8b3ad35d7a7e4.1384975172.git.jcody@redhat.com>
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Patchwork-id: 55803
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O-Subject: [RHEL7 qemu-kvm PATCH 10/26] block: vhdx - log support struct and defines
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Bugzilla: 879234
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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RH-Acked-by: Fam Zheng <famz@redhat.com>
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This adds some magic number defines, and internal structure definitions
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for VHDX log replay support.  The struct VHDXLogEntries does not reflect
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an on-disk data structure, and thus does not need to be packed.
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Some minor code style fixes are applied as well.
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Signed-off-by: Jeff Cody <jcody@redhat.com>
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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(cherry picked from commit 625565d27e8d7c7f7238ccd118a2cd49c1c52963)
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---
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 block/vhdx.h | 46 ++++++++++++++++++++++++++++++----------------
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 1 file changed, 30 insertions(+), 16 deletions(-)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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 block/vhdx.h |   46 ++++++++++++++++++++++++++++++----------------
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 1 files changed, 30 insertions(+), 16 deletions(-)
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diff --git a/block/vhdx.h b/block/vhdx.h
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index 57375ff..76ce4aa 100644
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--- a/block/vhdx.h
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+++ b/block/vhdx.h
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@@ -30,12 +30,12 @@
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  * 0.........64KB...........128KB........192KB..........256KB................1MB
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  */
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-#define VHDX_HEADER_BLOCK_SIZE      (64*1024)
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+#define VHDX_HEADER_BLOCK_SIZE      (64 * 1024)
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 #define VHDX_FILE_ID_OFFSET         0
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-#define VHDX_HEADER1_OFFSET         (VHDX_HEADER_BLOCK_SIZE*1)
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-#define VHDX_HEADER2_OFFSET         (VHDX_HEADER_BLOCK_SIZE*2)
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-#define VHDX_REGION_TABLE_OFFSET    (VHDX_HEADER_BLOCK_SIZE*3)
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+#define VHDX_HEADER1_OFFSET         (VHDX_HEADER_BLOCK_SIZE * 1)
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+#define VHDX_HEADER2_OFFSET         (VHDX_HEADER_BLOCK_SIZE * 2)
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+#define VHDX_REGION_TABLE_OFFSET    (VHDX_HEADER_BLOCK_SIZE * 3)
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 /*
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@@ -77,10 +77,10 @@ typedef struct QEMU_PACKED MSGUID {
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 #define guid_eq(a, b) \
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     (memcmp(&(a), &(b), sizeof(MSGUID)) == 0)
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-#define VHDX_HEADER_SIZE (4*1024)   /* although the vhdx_header struct in disk
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-                                       is only 582 bytes, for purposes of crc
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-                                       the header is the first 4KB of the 64KB
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-                                       block */
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+#define VHDX_HEADER_SIZE (4 * 1024)   /* although the vhdx_header struct in disk
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+                                         is only 582 bytes, for purposes of crc
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+                                         the header is the first 4KB of the 64KB
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+                                         block */
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 /* The full header is 4KB, although the actual header data is much smaller.
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  * But for the checksum calculation, it is over the entire 4KB structure,
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@@ -92,7 +92,7 @@ typedef struct QEMU_PACKED VHDXHeader {
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                                            VHDX file has 2 of these headers,
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                                            and only the header with the highest
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                                            sequence number is valid */
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-    MSGUID      file_write_guid;       /* 128 bit unique identifier. Must be
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+    MSGUID      file_write_guid;        /* 128 bit unique identifier. Must be
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                                            updated to new, unique value before
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                                            the first modification is made to
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                                            file */
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@@ -151,7 +151,10 @@ typedef struct QEMU_PACKED VHDXRegionTableEntry {
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 /* ---- LOG ENTRY STRUCTURES ---- */
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+#define VHDX_LOG_MIN_SIZE (1024 * 1024)
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+#define VHDX_LOG_SECTOR_SIZE 4096
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 #define VHDX_LOG_HDR_SIZE 64
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+#define VHDX_LOG_SIGNATURE 0x65676f6c
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 typedef struct QEMU_PACKED VHDXLogEntryHeader {
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     uint32_t    signature;              /* "loge" in ASCII */
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     uint32_t    checksum;               /* CRC-32C hash of the 64KB table */
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@@ -174,7 +177,8 @@ typedef struct QEMU_PACKED VHDXLogEntryHeader {
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 } VHDXLogEntryHeader;
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 #define VHDX_LOG_DESC_SIZE 32
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-
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+#define VHDX_LOG_DESC_SIGNATURE 0x63736564
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+#define VHDX_LOG_ZERO_SIGNATURE 0x6f72657a
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 typedef struct QEMU_PACKED VHDXLogDescriptor {
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     uint32_t    signature;              /* "zero" or "desc" in ASCII */
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     union  {
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@@ -194,6 +198,7 @@ typedef struct QEMU_PACKED VHDXLogDescriptor {
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                                            vhdx_log_entry_header */
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 } VHDXLogDescriptor;
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+#define VHDX_LOG_DATA_SIGNATURE 0x61746164
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 typedef struct QEMU_PACKED VHDXLogDataSector {
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     uint32_t    data_signature;         /* "data" in ASCII */
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     uint32_t    sequence_high;          /* 4 MSB of 8 byte sequence_number */
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@@ -219,12 +224,12 @@ typedef struct QEMU_PACKED VHDXLogDataSector {
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 #define SB_BLOCK_PRESENT        6
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 /* per the spec */
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-#define VHDX_MAX_SECTORS_PER_BLOCK  (1<<23)
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+#define VHDX_MAX_SECTORS_PER_BLOCK  (1 << 23)
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 /* upper 44 bits are the file offset in 1MB units lower 3 bits are the state
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    other bits are reserved */
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 #define VHDX_BAT_STATE_BIT_MASK 0x07
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-#define VHDX_BAT_FILE_OFF_BITS (64-44)
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+#define VHDX_BAT_FILE_OFF_BITS (64 - 44)
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 typedef uint64_t VHDXBatEntry;
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 /* ---- METADATA REGION STRUCTURES ---- */
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@@ -252,8 +257,8 @@ typedef struct QEMU_PACKED VHDXMetadataTableEntry {
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                                            metadata region */
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                                         /* note: if length = 0, so is offset */
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     uint32_t    length;                 /* length of metadata. <= 1MB. */
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-    uint32_t    data_bits;      /* least-significant 3 bits are flags, the
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-                                   rest are reserved (see above) */
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+    uint32_t    data_bits;              /* least-significant 3 bits are flags,
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+                                           the rest are reserved (see above) */
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     uint32_t    reserved2;
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 } VHDXMetadataTableEntry;
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@@ -265,8 +270,8 @@ typedef struct QEMU_PACKED VHDXMetadataTableEntry {
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 typedef struct QEMU_PACKED VHDXFileParameters {
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     uint32_t    block_size;             /* size of each payload block, always
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                                            power of 2, <= 256MB and >= 1MB. */
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-    uint32_t data_bits;     /* least-significant 2 bits are flags, the rest
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-                               are reserved (see above) */
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+    uint32_t data_bits;                 /* least-significant 2 bits are flags,
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+                                           the rest are reserved (see above) */
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 } VHDXFileParameters;
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 typedef struct QEMU_PACKED VHDXVirtualDiskSize {
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@@ -318,6 +323,13 @@ typedef struct VHDXMetadataEntries {
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     uint16_t present;
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 } VHDXMetadataEntries;
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+typedef struct VHDXLogEntries {
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+    uint64_t offset;
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+    uint64_t length;
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+    uint32_t head;
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+    uint32_t tail;
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+} VHDXLogEntries;
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+
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 typedef struct BDRVVHDXState {
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     CoMutex lock;
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@@ -351,6 +363,8 @@ typedef struct BDRVVHDXState {
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     MSGUID session_guid;
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+    VHDXLogEntries log;
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+
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     VHDXParentLocatorHeader parent_header;
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     VHDXParentLocatorEntry *parent_entries;
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-- 
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1.7.1
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