From patchwork Thu Aug 1 03:23:50 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Cody X-Patchwork-Id: 263887 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 35D522C00C1 for ; Thu, 1 Aug 2013 13:25:03 +1000 (EST) Received: from localhost ([::1]:55055 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1V4jVb-0003SN-GR for incoming@patchwork.ozlabs.org; Wed, 31 Jul 2013 23:24:59 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:56720) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1V4jUw-00039g-UD for qemu-devel@nongnu.org; Wed, 31 Jul 2013 23:24:24 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1V4jUq-000556-LT for qemu-devel@nongnu.org; Wed, 31 Jul 2013 23:24:18 -0400 Received: from mx1.redhat.com ([209.132.183.28]:44452) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1V4jUq-00054l-BR for qemu-devel@nongnu.org; Wed, 31 Jul 2013 23:24:12 -0400 Received: from int-mx01.intmail.prod.int.phx2.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id r713OBL6015245 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Wed, 31 Jul 2013 23:24:11 -0400 Received: from localhost ([10.3.112.13]) by int-mx01.intmail.prod.int.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id r713O8Pm029948 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES128-SHA bits=128 verify=NO); Wed, 31 Jul 2013 23:24:10 -0400 From: Jeff Cody To: qemu-devel@nongnu.org Date: Wed, 31 Jul 2013 23:23:50 -0400 Message-Id: In-Reply-To: References: In-Reply-To: References: X-Scanned-By: MIMEDefang 2.67 on 10.5.11.11 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 209.132.183.28 Cc: kwolf@redhat.com, famz@redhat.com, stefanha@redhat.com Subject: [Qemu-devel] [PATCH v2 5/9] block: vhdx - break endian translation functions out X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org This moves the endian translation functions out from the vhdx.c source, into a separate source file. In addition to the previously defined endian functions, new endian translation functions for log support are added as well. Signed-off-by: Jeff Cody --- block/Makefile.objs | 2 +- block/vhdx-endian.c | 141 ++++++++++++++++++++++++++++++++++++++++++++++++++++ block/vhdx.c | 43 ---------------- block/vhdx.h | 13 +++++ 4 files changed, 155 insertions(+), 44 deletions(-) create mode 100644 block/vhdx-endian.c diff --git a/block/Makefile.objs b/block/Makefile.objs index e5e54e6..e6f5d33 100644 --- a/block/Makefile.objs +++ b/block/Makefile.objs @@ -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 block-obj-y += qcow2.o qcow2-refcount.o qcow2-cluster.o qcow2-snapshot.o qcow2-cache.o block-obj-y += qed.o qed-gencb.o qed-l2-cache.o qed-table.o qed-cluster.o block-obj-y += qed-check.o -block-obj-$(CONFIG_VHDX) += vhdx.o +block-obj-$(CONFIG_VHDX) += vhdx.o vhdx-endian.o block-obj-y += parallels.o blkdebug.o blkverify.o block-obj-y += snapshot.o qapi.o block-obj-$(CONFIG_WIN32) += raw-win32.o win32-aio.o diff --git a/block/vhdx-endian.c b/block/vhdx-endian.c new file mode 100644 index 0000000..f7a59c5 --- /dev/null +++ b/block/vhdx-endian.c @@ -0,0 +1,141 @@ +/* + * Block driver for Hyper-V VHDX Images + * + * Copyright (c) 2013 Red Hat, Inc., + * + * Authors: + * Jeff Cody + * + * This is based on the "VHDX Format Specification v1.00", published 8/25/2012 + * by Microsoft: + * https://www.microsoft.com/en-us/download/details.aspx?id=34750 + * + * This work is licensed under the terms of the GNU LGPL, version 2 or later. + * See the COPYING.LIB file in the top-level directory. + * + */ + +#include "qemu-common.h" +#include "block/block_int.h" +#include "block/vhdx.h" + +#include + + +/* + * All the VHDX formats on disk are little endian - the following + * are helper import/export functions to correctly convert + * endianness from disk read to native cpu format, and back again. + */ + + +/* VHDX File Header */ + + +void vhdx_header_le_import(VHDXHeader *h) +{ + assert(h != NULL); + + le32_to_cpus(&h->signature); + le32_to_cpus(&h->checksum); + le64_to_cpus(&h->sequence_number); + + leguid_to_cpus(&h->file_write_guid); + leguid_to_cpus(&h->data_write_guid); + leguid_to_cpus(&h->log_guid); + + le16_to_cpus(&h->log_version); + le16_to_cpus(&h->version); + le32_to_cpus(&h->log_length); + le64_to_cpus(&h->log_offset); +} + +void vhdx_header_le_export(VHDXHeader *orig_h, VHDXHeader *new_h) +{ + assert(orig_h != NULL); + assert(new_h != NULL); + + new_h->signature = cpu_to_le32(orig_h->signature); + new_h->checksum = cpu_to_le32(orig_h->checksum); + new_h->sequence_number = cpu_to_le64(orig_h->sequence_number); + + memcpy(&new_h->file_write_guid, &orig_h->file_write_guid, sizeof(MSGUID)); + memcpy(&new_h->data_write_guid, &orig_h->data_write_guid, sizeof(MSGUID)); + memcpy(&new_h->log_guid, &orig_h->log_guid, sizeof(MSGUID)); + + cpu_to_leguids(&new_h->file_write_guid); + cpu_to_leguids(&new_h->data_write_guid); + cpu_to_leguids(&new_h->log_guid); + + new_h->log_version = cpu_to_le16(orig_h->log_version); + new_h->version = cpu_to_le16(orig_h->version); + new_h->log_length = cpu_to_le32(orig_h->log_length); + new_h->log_offset = cpu_to_le64(orig_h->log_offset); +} + + +/* VHDX Log Headers */ + + +void vhdx_log_desc_le_import(VHDXLogDescriptor *d) +{ + assert(d != NULL); + + le32_to_cpus(&d->signature); + le32_to_cpus(&d->trailing_bytes); + le64_to_cpus(&d->leading_bytes); + le64_to_cpus(&d->file_offset); + le64_to_cpus(&d->sequence_number); +} + +void vhdx_log_desc_le_export(VHDXLogDescriptor *d) +{ + assert(d != NULL); + + cpu_to_le32s(&d->signature); + cpu_to_le32s(&d->trailing_bytes); + cpu_to_le64s(&d->leading_bytes); + cpu_to_le64s(&d->file_offset); + cpu_to_le64s(&d->sequence_number); +} + +void vhdx_log_data_le_export(VHDXLogDataSector *d) +{ + assert(d != NULL); + + cpu_to_le32s(&d->data_signature); + cpu_to_le32s(&d->sequence_high); + cpu_to_le32s(&d->sequence_low); +} + +void vhdx_log_entry_hdr_le_import(VHDXLogEntryHeader *hdr) +{ + assert(hdr != NULL); + + le32_to_cpus(&hdr->signature); + le32_to_cpus(&hdr->checksum); + le32_to_cpus(&hdr->entry_length); + le32_to_cpus(&hdr->tail); + le64_to_cpus(&hdr->sequence_number); + le32_to_cpus(&hdr->descriptor_count); + leguid_to_cpus(&hdr->log_guid); + le64_to_cpus(&hdr->flushed_file_offset); + le64_to_cpus(&hdr->last_file_offset); +} + +void vhdx_log_entry_hdr_le_export(VHDXLogEntryHeader *hdr) +{ + assert(hdr != NULL); + + cpu_to_le32s(&hdr->signature); + cpu_to_le32s(&hdr->checksum); + cpu_to_le32s(&hdr->entry_length); + cpu_to_le32s(&hdr->tail); + cpu_to_le64s(&hdr->sequence_number); + cpu_to_le32s(&hdr->descriptor_count); + cpu_to_le64s(&hdr->flushed_file_offset); + cpu_to_le64s(&hdr->last_file_offset); + cpu_to_leguids(&hdr->log_guid); +} + + diff --git a/block/vhdx.c b/block/vhdx.c index 57223d5..9802b74 100644 --- a/block/vhdx.c +++ b/block/vhdx.c @@ -227,49 +227,6 @@ static int vhdx_probe(const uint8_t *buf, int buf_size, const char *filename) return 0; } -/* All VHDX structures on disk are little endian */ -static void vhdx_header_le_import(VHDXHeader *h) -{ - assert(h != NULL); - - le32_to_cpus(&h->signature); - le32_to_cpus(&h->checksum); - le64_to_cpus(&h->sequence_number); - - leguid_to_cpus(&h->file_write_guid); - leguid_to_cpus(&h->data_write_guid); - leguid_to_cpus(&h->log_guid); - - le16_to_cpus(&h->log_version); - le16_to_cpus(&h->version); - le32_to_cpus(&h->log_length); - le64_to_cpus(&h->log_offset); -} - -/* All VHDX structures on disk are little endian */ -static void vhdx_header_le_export(VHDXHeader *orig_h, VHDXHeader *new_h) -{ - assert(orig_h != NULL); - assert(new_h != NULL); - - new_h->signature = cpu_to_le32(orig_h->signature); - new_h->checksum = cpu_to_le32(orig_h->checksum); - new_h->sequence_number = cpu_to_le64(orig_h->sequence_number); - - memcpy(&new_h->file_write_guid, &orig_h->file_write_guid, sizeof(MSGUID)); - memcpy(&new_h->data_write_guid, &orig_h->data_write_guid, sizeof(MSGUID)); - memcpy(&new_h->log_guid, &orig_h->log_guid, sizeof(MSGUID)); - - cpu_to_leguids(&new_h->file_write_guid); - cpu_to_leguids(&new_h->data_write_guid); - cpu_to_leguids(&new_h->log_guid); - - new_h->log_version = cpu_to_le16(orig_h->log_version); - new_h->version = cpu_to_le16(orig_h->version); - new_h->log_length = cpu_to_le32(orig_h->log_length); - new_h->log_offset = cpu_to_le64(orig_h->log_offset); -} - /* Update the VHDX headers * * This follows the VHDX spec procedures for header updates. diff --git a/block/vhdx.h b/block/vhdx.h index 2db6615..5e0a1d3 100644 --- a/block/vhdx.h +++ b/block/vhdx.h @@ -398,4 +398,17 @@ static inline void cpu_to_leguids(MSGUID *guid) cpu_to_le16s(&guid->data3); } +void vhdx_header_le_import(VHDXHeader *h); +void vhdx_header_le_export(VHDXHeader *orig_h, VHDXHeader *new_h); +void vhdx_log_desc_le_import(VHDXLogDescriptor *d); +void vhdx_log_desc_le_export(VHDXLogDescriptor *d); +void vhdx_log_data_le_export(VHDXLogDataSector *d); +void vhdx_log_entry_hdr_le_import(VHDXLogEntryHeader *hdr); +void vhdx_log_entry_hdr_le_export(VHDXLogEntryHeader *hdr); + + + + + + #endif