[Sheepdog] [RFC PATCH v2 0/10] add a new store named 'farm'

[Liu Yuan]

On 12/23/2011 05:24 AM, Christoph Hellwig wrote:

> On Thu, Dec 22, 2011 at 02:52:33PM +0800, Liu Yuan wrote:
>>  - no stale objects that are found in current implementation, that will
>> waste storage a lot.
> 
> 
> Reference counting the object will be absolute essential.  The by far
> cheapest way for that would be to reference count them in an xattr on
> the actual object.
> 
> Mortia and Yuan, is there a strict policy against xattrs in sheepdog,
> and if so yes?


No, you are free to use xattr if you really need it. In the past we had
a try to remove xattr usage because we thought that it was not really
necessary for storing non-frequent referenced value in xattr. I don't
want assume underlying file system capability, but if there is a reason,
I don't deny it.

By the way, what do you count object for?

Thanks,
Yuan