[stgt] [PATCH] Make the backing-store modules shared objects that are loaded at runtime

[Boaz Harrosh]

On 08/10/2013 12:37 PM, ronnie sahlberg wrote:
> On Fri, Aug 9, 2013 at 11:09 PM, Dan Mick <dan.mick at inktank.com> wrote:
>> I can confirm that, with all instances of 'rdb' changed to 'rbd', and the
>> obvious change to bs_rbd.c, this works for bs_rbd as well.  If I'd been more
>> intelligent I'd have committed your patch locally before hacking on it.
>> It's late. :)
> 
> Thanks. I have updated the patch.
>>
>> +1 on the idea and overall structure; it would be interesting in particular
>> to hear others' opinions about the choice of /usr/lib/tgtd/backing-store,
>> although it seems fine to me.
> 
> I have no strong feelings about where to store the modules so if
> anyone has a better suggestion for the directory, please let me know
> and I'll change it.
> 

In these cases the installing scripts can just create a symlink in
/usr/lib/tgtd/backing-store to a module that resides with in it's
own package, say rdb. This way you compile for the real place and
need not have tgtd installed (/usr/lib/tgtd/backing-store exist)

You will however need a 3rd package, say tgtd-rdb, dependent on
both that ties everything in at installation time.

My $0.017
Boaz

> 
>>
>> Ceph users would benefit greatly from the ability for the official released
>> packages (assuming the package maintainers will do it) to contain the rbd
>> backend without requiring compilation.
> 
> Yes. It would also be really neat if at a later stage one could
> unload/reload a bs module at runtime. This I think would greatly
> improve the experience for people that are developing and testing
> backends.
> 
>>
>>
<>
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