Re: [PATCH 0/4] (Refactored) VHD Support Addition

[Ben Guthro <bguthro@virtualiron.com>]

My mistake - I had my patches pushed when I did the hg tip.

This applies against CS 15410:a83632dfbb28

Ben Guthro wrote:
> [PATCH 0/4] (Refactored) VHD Support addition
> The patches that follow implement Microsoft's VHD format support, and
> apply to xen-unstable.hg CS 15414:3827b12d24dd
> Per Mark McLoughlin's suggestions - these have been reworked to use the 
> tapaio wrapper.
>
> This is based on the VHD format spec covered by Microsoft's "Open
> Specification Promise":
> http://www.microsoft.com/interop/osp/default.mspx
> MS VHD Spec can be found at the following link:
> http://download.microsoft.com/download/f/f/e/ffef50a5-07dd-4cf8-aaa3-442c0673a029/Virtual%20Hard%20Disk%20Format%20Spec_10_18_06.doc
>
> It is divided up into the following patches:
> qemu-vhd-support.patch        [1/4]
> tapdisk-vhd-support.patch     [2/4]
> blktap-fixes.patch            [3/4]
> vdisk-support.patch           [4/4]
>
> ### libvdisk ####
> These patches implement a shared library (libvdisk) between qemu, and
> blktap which can be expanded upon for additional formats in the future.
> This was done in order to avoid code duplcation between the two areas.
> At this time, it only supports the vhd format.
>
> ### vdisk_tool ###
> The vdisk_tool provides a means of creating, and converting vhd files.
> Like libvdisk, it is designed with future support of additional formats
> in mind, but currently only supports vhd.
>
> Usage: vdisk_tool OPTIONS -# <format-specific options> <filename>
>   OPTIONS:
>     [-f <format>] [-C] [-H] [-M] [-D <block> [-b <num_blocks>] -o outfile]]
>     -C        Create a vdisk
>     -H        Read vdisk headers from file
>     -M        Modify a vdisk
>     -D        Dump a vhd
>       block       first block to read (required)
>       num_blocks       number of blocks to read. If not
>                 specified, whole file will be read
>       outfile       output file. If not specified,
>                 stdout is used
>     
>
> With this, you can convert foo.vhd to raw volume /dev/foo/bar:
>       vdisk_tool -D 0 -o /dev/foo/bar foo.vhd
>
> To convert foo.vhd to fixed bar.vhd
>       vdisk_tool -D 0 -o bar.vhd foo.vhd
>       vdisk_tool -C -# -S <sizeB> -f bar.vhd
>
> To read blocks 2 through 6 from foo.vhd to stdout:
>       vdisk_tool -D 2 -b 5 foo.vhd
>
>
>
>
>
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