[stgt] [PATCH 1/1] enhance tgtimg to create media for DVD emulation

[ronnie sahlberg]

On Fri, Apr 2, 2010 at 12:02 PM, FUJITA Tomonori
<fujita.tomonori at lab.ntt.co.jp> wrote:
> On Fri, 2 Apr 2010 10:29:22 +1100
> ronnie sahlberg <ronniesahlberg at gmail.com> wrote:
>
>> Please find attached a patch to tgtimg and its manpage to describe the use of
>> tgtimg to create media for the dvd emulation.
>
> From a quick look, tgtimg tools create a zero-size file, right?
>
> What is the further plan? We need metadata for a dvd image file? If
> so, how can we store (targets.conf or etc)?
>

It creates an empty file   which tgtd then treats as a burnable dvd+r.
This can just as well be done by running "touch" to create an empry
file, but I think it would be
nice if one would use tgtimg for all devices.

I would then create similar code for tgtimg to create a disk device.
Just creating the file and writing zero to the entire file, just like
dd would do.



Metadata is a different topic. As you say,  xattr is difficult to use
in a unified way to store things because of SSC requiring so much
metadata.
I will leave metadata in targets.conf for now until there is consensus
on how to handle it in an acceptable way for MMC and SBC.
Perhaps one could use *.tgtd-metadata files to store the metadata for
MMC and SBC devices isntead of xattr?

regards
ronnie sahlberg
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