[stgt] backing-store options

Dan Mick dan.mick at inktank.com
Wed Oct 9 03:24:06 CEST 2013

(sorry for the delay, I was out Friday and Monday)

On 10/04/2013 12:27 PM, Boaz Harrosh wrote:
> On 10/03/2013 06:50 PM, Dan Mick wrote:
>> I was thinking only one value, and I know it can't include comma (the
>> way tgtadm sends options), but otherwise it's freeform.  (Actually there
>> might be other illegal chars; I should find out and specify.)
>> I was thinking of using it like "-o value --longopt=value" etc., but, as
>> it's freeform, backends can do whatever they like.
>> Or we could provide some more mechanism, but I figured since I'm the one
>> who wants it, I might be the only one who ever does.
> I have two values that I need now if you do --longopt=value then it will
> need to be for me something like:
> 	--longopt=name1:value1;name2:value2
> Where ":" separates between the name and value. And ";" separates between
> pairs.
> (Again what I have now is all ontop of --backing-store)

My initial effort was not to provide any generic parsing at all, and let 
the backends implement whatever's most convenient; if y'all think
generic parsing is useful, there's no reason not to legislate it,
I suppose.  The iscsi parsing is pretty roll-your-own.

> [BTW: "--bstype=VALUE" but "--backing-store VALUE" without the "=", so you
>   can go either way]

Yeah, tgtadm uses getopt_long which allows either '=' or ' '.

> If you have the one value then do it like that. Just specify somewhere
> what are the illegal chars like you said ",".
> BTW: I do not think the coma parsing in tgt will interfere here because
> it will be a different case I think. (Haven't look at that code for so
> long)

tgtadm passes the options to tgtd after validation, and it passes them 
as one big key1=val1,key2=val2,.. string (in the 'buf' following the 
header), and provides no facility for quoting ','.  So I think the
bsopts definition should steer clear of ',' separators.

> Thanks
> Boaz
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