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block: Fix vpc initialization of the Dynamic Disk Header 

The Data Offset field in the Dynamic Disk Header is an 8 byte field.
Although the specification (2006-10-11) gives an example of initializing
only the first 4 bytes, images generated by Microsoft on Windows initialize
all 8 bytes.

Failure to initialize all 8 bytes results in errors from utilities
like Citrix's vhd-util which checks specifically for the proper Data
Offset field initialization.

Signed-off-by: Charles Arnold <carnold@suse.com>
Reviewed-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Charles Arnold 2011-11-09 09:32:25 -07:00 committed by Kevin Wolf
parent 802ddc375a
commit 78439f6af1
1 changed files with 5 additions and 1 deletions
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6
block/vpc.c
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@ -617,7 +617,11 @@ static int vpc_create(const char *filename, QEMUOptionParameter *options)
memcpy(dyndisk_header->magic, "cxsparse", 8);
dyndisk_header->data_offset = be64_to_cpu(0xFFFFFFFF);
/*
* Note: The spec is actually wrong here for data_offset, it says
* 0xFFFFFFFF, but MS tools expect all 64 bits to be set.
*/
dyndisk_header->data_offset = be64_to_cpu(0xFFFFFFFFFFFFFFFFULL);
dyndisk_header->table_offset = be64_to_cpu(3 * 512);
dyndisk_header->version = be32_to_cpu(0x00010000);
dyndisk_header->block_size = be32_to_cpu(block_size);