[linux-lvm] Re: Bug#331342: lvm2: lvs fails to display snapshot volumes

[Bastian Blank <waldi@debian.org>]

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tags 331342 upstream
forwarded 331342 linux-lvm@redhat.com
thanks

On Mon, Oct 03, 2005 at 04:12:19AM +0200, Barasz Mihaly wrote:
> After a recent upgrade lvs and lvdisplay stopped to display snapshot
> volumes. Example:
> 
> # lvs
>   LV   VG   Attr   LSize  Origin Snap%  Move Log Copy% 
>   data vg0  -wi-ao 84.00G                              
>   home vg0  owi-ao 50.00G                              
> #
> 
> One can see that "home" is an origin for some snapshot, but can't see
> the snapshot volume.
> 
> It may be interesting, that the snapshot can be used, it appears in
> /dev/vg0:
> 
> # ls -l /dev/vg0
> total 0
> lrwxrwxrwx  1 root root 20 Oct  3 03:32 data -> /dev/mapper/vg0-data
> lrwxrwxrwx  1 root root 20 Oct  3 03:32 home -> /dev/mapper/vg0-home
> lrwxrwxrwx  1 root root 22 Oct  3 03:32 tegnap -> /dev/mapper/vg0-tegnap
> # 
> (the one named "tegnap" is the snapshot.)
> 
> Snapshots still can be created/removed/used, the only problem that they are
> "invisible" now.

Seems that I found the problem. The code which iterates over the LVs
explicitely ignores snapshot volumes.

tools/toollib.c:
| 62         list_iterate_items(lvl, &vg->lvs) {
| 63                if (lvl->lv->status & SNAPSHOT)
| 64                        continue;

> I've checked the vanilla versions from
> ftp://sources.redhat.com/pub/lvm2/  and neither 2.01.13 nor 2.01.14
> works, so the bug is probably in the upstream.
> The last version that works for me is 2.01.09.

This code is new in 2.01.10 or 2.01.11.

Bastian

-- 
Well, Jim, I'm not much of an actor either.

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