dm thin: How to shrink think pool device?

[Maxim Patlasov <mpatlasov@xxxxxxxxxxxxx>]

Hi,

It seems that a "trim" pool message was planned long time ago, but never implemented. Could someone update about current status of that? The question came from the following use-case:

Suppose we have a thin pool on top of LVM volume group. The group comprises of several storage drives. Now I need to (physically) remove one of them. The intention is to use pvmove and vgreduce, but obviously thin pool must be requested to shrink itself at first.

Btw, Documentation/device-mapper/thin-provisioning.txt still has a leftover about it:

> If you wish to reduce the size of your thin device and potentially
> regain some space then send the 'trim' message to the pool.

Thanks,

Maxim

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