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From 69a9776f3e8a4ff5311f78cc63e52ea436dd9cbe Mon Sep 17 00:00:00 2001
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From: Charles Arnold <carnold@suse.com>
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Date: Wed, 9 Nov 2011 09:32:25 -0700
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Subject: [PATCH] block: Fix vpc initialization of the Dynamic Disk Header
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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The Data Offset field in the Dynamic Disk Header is an 8 byte field.
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Although the specification (2006-10-11) gives an example of initializing
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only the first 4 bytes, images generated by Microsoft on Windows initialize
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all 8 bytes.
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Failure to initialize all 8 bytes results in errors from utilities
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like Citrix's vhd-util which checks specifically for the proper Data
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Offset field initialization.
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Signed-off-by: Charles Arnold <carnold@suse.com>
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Reviewed-by: Andreas Färber <afaerber@suse.de>
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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(cherry picked from commit 78439f6af1caa3e8bdafc9fc2d62aeefa53ed63a)
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Signed-off-by: Bruce Rogers <brogers@suse.com>
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Signed-off-by: Andreas Färber <afaerber@suse.de>
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---
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block/vpc.c | 6 +++++-
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1 file changed, 5 insertions(+), 1 deletion(-)
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diff --git a/block/vpc.c b/block/vpc.c
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index 56865da..ac33e15 100644
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--- a/block/vpc.c
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+++ b/block/vpc.c
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@@ -587,7 +587,11 @@ static int vpc_create(const char *filename, QEMUOptionParameter *options)
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memcpy(dyndisk_header->magic, "cxsparse", 8);
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- dyndisk_header->data_offset = be64_to_cpu(0xFFFFFFFF);
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+ /*
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+ * Note: The spec is actually wrong here for data_offset, it says
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+ * 0xFFFFFFFF, but MS tools expect all 64 bits to be set.
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+ */
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+ dyndisk_header->data_offset = be64_to_cpu(0xFFFFFFFFFFFFFFFFULL);
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dyndisk_header->table_offset = be64_to_cpu(3 * 512);
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dyndisk_header->version = be32_to_cpu(0x00010000);
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dyndisk_header->block_size = be32_to_cpu(block_size);
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--
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1.7.11.2
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