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From: Spencer Baugh <sbaugh@catern.com>
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Date: Mon, 21 Mar 2016 14:37:46 -0400
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Subject: Re: [Qemu-devel] [PATCH] vpc: use current_size field for XenServer
	VHD images
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To: Stefan Hajnoczi <stefanha@redhat.com>, Grant Wu <grantwwu@gmail.com>
Cc: Kevin Wolf <kwolf@redhat.com>, qemu-devel@nongnu.org, qemu-block@nongnu.org

Stefan Hajnoczi <stefanha@redhat.com> writes:
> What output did you get from "qemu-img info /dev/dm-1"?

After the patching:

root@storage-4:~# hexdump -C -n 512 /dev/vgstorage/tartanfsbackup
00000000  63 6f 6e 65 63 74 69 78  00 00 00 02 00 01 00 00 |conectix........|
00000010  00 00 00 00 00 00 02 00  14 10 4b 1f 71 65 6d 32 |..........K.qem2|
00000020  00 01 00 03 00 00 00 00  00 00 01 c4 4f 40 00 00 |............O@..|
00000030  00 00 01 f4 00 00 00 00  ff ff 10 ff 00 00 00 03 |................|
00000040  ff ff ed 81 6d 0d 68 bd  9c fd 4d 65 a3 17 c7 6c |....m.h...Me...l|
00000050  06 a6 aa bf 00 00 00 00  00 00 00 00 00 00 00 00 |................|
00000060  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00 |................|
*
00000200
root@storage-4:~# qemu-img info /dev/vgstorage/tartanfsbackup
block-vpc: The header checksum of '/dev/vgstorage/tartanfsbackup' is incorrect.
qemu-img: Could not open '/dev/vgstorage/tartanfsbackup': Could not open '/dev/vgstorage/tartanfsbackup': Invalid argument

> Did qemu-nbd work?

root@storage-4:~# qemu-nbd -c /dev/nbd1 /dev/vgstorage/tartanfsbackup
block-vpc: The header checksum of '/dev/vgstorage/tartanfsbackup' is incorrect.
qemu-nbd: Failed to blk_new_open '/dev/vgstorage/tartanfsbackup': Could not open '/dev/vgstorage/tartanfsbackup': Invalid argument