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Blame SOURCES/kvm-block-vhdx-break-endian-translation-functions-out.patch

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From 88e96c366d923305d0d3f124bbe295ef5068c6bc 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 19:43:54 +0100
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Subject: [PATCH 11/25] block: vhdx - break endian translation functions out
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RH-Author: Jeffrey Cody <jcody@redhat.com>
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Message-id: <0f4c21e92172fde45d0a5c609a19afa2e1f5a015.1384975172.git.jcody@redhat.com>
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Patchwork-id: 55804
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O-Subject: [RHEL7 qemu-kvm PATCH 11/26] block: vhdx - break endian translation functions out
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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 moves the endian translation functions out from the vhdx.c source,
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into a separate source file. In addition to the previously defined
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endian functions, new endian translation functions for log support are
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added 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 0f48e8f0978afe0bd44c63749e7df6411da6c437)
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---
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 block/Makefile.objs |   2 +-
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 block/vhdx-endian.c | 141 ++++++++++++++++++++++++++++++++++++++++++++++++++++
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 block/vhdx.c        |  43 ----------------
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 block/vhdx.h        |   8 +++
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 4 files changed, 150 insertions(+), 44 deletions(-)
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 create mode 100644 block/vhdx-endian.c
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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 block/Makefile.objs |    2 +-
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 block/vhdx-endian.c |  141 +++++++++++++++++++++++++++++++++++++++++++++++++++
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 block/vhdx.c        |   43 ----------------
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 block/vhdx.h        |    8 +++
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 4 files changed, 150 insertions(+), 44 deletions(-)
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 create mode 100644 block/vhdx-endian.c
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diff --git a/block/Makefile.objs b/block/Makefile.objs
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index 114f8a5..a7b3b87 100644
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--- a/block/Makefile.objs
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+++ b/block/Makefile.objs
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@@ -2,7 +2,7 @@ block-obj-y += raw.o cow.o qcow.o vdi.o vmdk.o cloop.o dmg.o bochs.o vpc.o vvfat
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 block-obj-y += qcow2.o qcow2-refcount.o qcow2-cluster.o qcow2-snapshot.o qcow2-cache.o
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 block-obj-y += qed.o qed-gencb.o qed-l2-cache.o qed-table.o qed-cluster.o
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 block-obj-y += qed-check.o
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-block-obj-$(CONFIG_VHDX) += vhdx.o
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+block-obj-$(CONFIG_VHDX) += vhdx.o vhdx-endian.o
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 block-obj-y += parallels.o blkdebug.o blkverify.o
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 block-obj-y += snapshot.o qapi.o
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 block-obj-$(CONFIG_WIN32) += raw-win32.o win32-aio.o
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diff --git a/block/vhdx-endian.c b/block/vhdx-endian.c
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new file mode 100644
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index 0000000..3e93e63
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--- /dev/null
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+++ b/block/vhdx-endian.c
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@@ -0,0 +1,141 @@
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+/*
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+ * Block driver for Hyper-V VHDX Images
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+ *
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+ * Copyright (c) 2013 Red Hat, Inc.,
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+ *
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+ * Authors:
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+ *  Jeff Cody <jcody@redhat.com>
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+ *
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+ *  This is based on the "VHDX Format Specification v1.00", published 8/25/2012
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+ *  by Microsoft:
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+ *      https://www.microsoft.com/en-us/download/details.aspx?id=34750
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+ *
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+ * This work is licensed under the terms of the GNU LGPL, version 2 or later.
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+ * See the COPYING.LIB file in the top-level directory.
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+ *
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+ */
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+
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+#include "qemu-common.h"
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+#include "block/block_int.h"
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+#include "block/vhdx.h"
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+
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+#include <uuid/uuid.h>
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+
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+
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+/*
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+ * All the VHDX formats on disk are little endian - the following
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+ * are helper import/export functions to correctly convert
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+ * endianness from disk read to native cpu format, and back again.
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+ */
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+
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+
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+/* VHDX File Header */
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+
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+
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+void vhdx_header_le_import(VHDXHeader *h)
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+{
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+    assert(h != NULL);
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+
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+    le32_to_cpus(&h->signature);
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+    le32_to_cpus(&h->checksum);
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+    le64_to_cpus(&h->sequence_number);
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+
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+    leguid_to_cpus(&h->file_write_guid);
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+    leguid_to_cpus(&h->data_write_guid);
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+    leguid_to_cpus(&h->log_guid);
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+
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+    le16_to_cpus(&h->log_version);
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+    le16_to_cpus(&h->version);
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+    le32_to_cpus(&h->log_length);
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+    le64_to_cpus(&h->log_offset);
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+}
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+
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+void vhdx_header_le_export(VHDXHeader *orig_h, VHDXHeader *new_h)
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+{
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+    assert(orig_h != NULL);
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+    assert(new_h != NULL);
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+
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+    new_h->signature       = cpu_to_le32(orig_h->signature);
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+    new_h->checksum        = cpu_to_le32(orig_h->checksum);
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+    new_h->sequence_number = cpu_to_le64(orig_h->sequence_number);
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+
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+    new_h->file_write_guid = orig_h->file_write_guid;
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+    new_h->data_write_guid = orig_h->data_write_guid;
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+    new_h->log_guid        = orig_h->log_guid;
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+
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+    cpu_to_leguids(&new_h->file_write_guid);
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+    cpu_to_leguids(&new_h->data_write_guid);
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+    cpu_to_leguids(&new_h->log_guid);
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+
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+    new_h->log_version     = cpu_to_le16(orig_h->log_version);
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+    new_h->version         = cpu_to_le16(orig_h->version);
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+    new_h->log_length      = cpu_to_le32(orig_h->log_length);
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+    new_h->log_offset      = cpu_to_le64(orig_h->log_offset);
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+}
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+
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+
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+/* VHDX Log Headers */
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+
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+
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+void vhdx_log_desc_le_import(VHDXLogDescriptor *d)
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+{
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+    assert(d != NULL);
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+
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+    le32_to_cpus(&d->signature);
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+    le32_to_cpus(&d->trailing_bytes);
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+    le64_to_cpus(&d->leading_bytes);
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+    le64_to_cpus(&d->file_offset);
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+    le64_to_cpus(&d->sequence_number);
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+}
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+
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+void vhdx_log_desc_le_export(VHDXLogDescriptor *d)
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+{
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+    assert(d != NULL);
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+
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+    cpu_to_le32s(&d->signature);
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+    cpu_to_le32s(&d->trailing_bytes);
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+    cpu_to_le64s(&d->leading_bytes);
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+    cpu_to_le64s(&d->file_offset);
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+    cpu_to_le64s(&d->sequence_number);
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+}
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+
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+void vhdx_log_data_le_export(VHDXLogDataSector *d)
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+{
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+    assert(d != NULL);
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+
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+    cpu_to_le32s(&d->data_signature);
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+    cpu_to_le32s(&d->sequence_high);
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+    cpu_to_le32s(&d->sequence_low);
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+}
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+
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+void vhdx_log_entry_hdr_le_import(VHDXLogEntryHeader *hdr)
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+{
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+    assert(hdr != NULL);
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+
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+    le32_to_cpus(&hdr->signature);
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+    le32_to_cpus(&hdr->checksum);
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+    le32_to_cpus(&hdr->entry_length);
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+    le32_to_cpus(&hdr->tail);
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+    le64_to_cpus(&hdr->sequence_number);
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+    le32_to_cpus(&hdr->descriptor_count);
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+    leguid_to_cpus(&hdr->log_guid);
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+    le64_to_cpus(&hdr->flushed_file_offset);
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+    le64_to_cpus(&hdr->last_file_offset);
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+}
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+
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+void vhdx_log_entry_hdr_le_export(VHDXLogEntryHeader *hdr)
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+{
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+    assert(hdr != NULL);
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+
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+    cpu_to_le32s(&hdr->signature);
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+    cpu_to_le32s(&hdr->checksum);
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+    cpu_to_le32s(&hdr->entry_length);
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+    cpu_to_le32s(&hdr->tail);
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+    cpu_to_le64s(&hdr->sequence_number);
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+    cpu_to_le32s(&hdr->descriptor_count);
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+    cpu_to_leguids(&hdr->log_guid);
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+    cpu_to_le64s(&hdr->flushed_file_offset);
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+    cpu_to_le64s(&hdr->last_file_offset);
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+}
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+
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+
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diff --git a/block/vhdx.c b/block/vhdx.c
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index 16321ff..2efece1 100644
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--- a/block/vhdx.c
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+++ b/block/vhdx.c
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@@ -223,49 +223,6 @@ static int vhdx_probe(const uint8_t *buf, int buf_size, const char *filename)
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     return 0;
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 }
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-/* All VHDX structures on disk are little endian */
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-static void vhdx_header_le_import(VHDXHeader *h)
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-{
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-    assert(h != NULL);
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-
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-    le32_to_cpus(&h->signature);
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-    le32_to_cpus(&h->checksum);
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-    le64_to_cpus(&h->sequence_number);
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-
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-    leguid_to_cpus(&h->file_write_guid);
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-    leguid_to_cpus(&h->data_write_guid);
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-    leguid_to_cpus(&h->log_guid);
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-
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-    le16_to_cpus(&h->log_version);
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-    le16_to_cpus(&h->version);
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-    le32_to_cpus(&h->log_length);
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-    le64_to_cpus(&h->log_offset);
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-}
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-
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-/* All VHDX structures on disk are little endian */
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-static void vhdx_header_le_export(VHDXHeader *orig_h, VHDXHeader *new_h)
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-{
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-    assert(orig_h != NULL);
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-    assert(new_h != NULL);
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-
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-    new_h->signature       = cpu_to_le32(orig_h->signature);
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-    new_h->checksum        = cpu_to_le32(orig_h->checksum);
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-    new_h->sequence_number = cpu_to_le64(orig_h->sequence_number);
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-
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-    new_h->file_write_guid = orig_h->file_write_guid;
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-    new_h->data_write_guid = orig_h->data_write_guid;
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-    new_h->log_guid        = orig_h->log_guid;
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-
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-    cpu_to_leguids(&new_h->file_write_guid);
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-    cpu_to_leguids(&new_h->data_write_guid);
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-    cpu_to_leguids(&new_h->log_guid);
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-
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-    new_h->log_version     = cpu_to_le16(orig_h->log_version);
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-    new_h->version         = cpu_to_le16(orig_h->version);
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-    new_h->log_length      = cpu_to_le32(orig_h->log_length);
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-    new_h->log_offset      = cpu_to_le64(orig_h->log_offset);
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-}
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-
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 /* Update the VHDX headers
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  *
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  * This follows the VHDX spec procedures for header updates.
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diff --git a/block/vhdx.h b/block/vhdx.h
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index 76ce4aa..55975a2 100644
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--- a/block/vhdx.h
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+++ b/block/vhdx.h
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@@ -394,4 +394,12 @@ static inline void cpu_to_leguids(MSGUID *guid)
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     cpu_to_le16s(&guid->data3);
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 }
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+void vhdx_header_le_import(VHDXHeader *h);
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+void vhdx_header_le_export(VHDXHeader *orig_h, VHDXHeader *new_h);
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+void vhdx_log_desc_le_import(VHDXLogDescriptor *d);
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+void vhdx_log_desc_le_export(VHDXLogDescriptor *d);
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+void vhdx_log_data_le_export(VHDXLogDataSector *d);
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+void vhdx_log_entry_hdr_le_import(VHDXLogEntryHeader *hdr);
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+void vhdx_log_entry_hdr_le_export(VHDXLogEntryHeader *hdr);
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+
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 #endif
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-- 
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1.7.1
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