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Re: [lvm-devel] LVM2 ./WHATS_NEW lib/metadata/vg.c



Dne 25.4.2012 15:38, jbrassow sourceware org napsal(a):
> CVSROOT:	/cvs/lvm2
> Module name:	LVM2
> Changes by:	jbrassow sourceware org	2012-04-25 13:38:42
> 
> Modified files:
> 	.              : WHATS_NEW 
> 	lib/metadata   : vg.c 
> 
> Log message:
> 	Disallow changing cluster attribute of VG while RAID LVs are active.
> 	
> 	Mirror and snapshot LVs are already checked for when switching the cluster
> 	attribute of a VG.  This patch adds RAID.
> 
> Patches:
> http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/WHATS_NEW.diff?cvsroot=lvm2&r1=1.2392&r2=1.2393
> http://sourceware.org/cgi-bin/cvsweb.cgi/LVM2/lib/metadata/vg.c.diff?cvsroot=lvm2&r1=1.17&r2=1.18
> 
> --- LVM2/WHATS_NEW	2012/04/25 09:32:36	1.2392
> +++ LVM2/WHATS_NEW	2012/04/25 13:38:41	1.2393
> @@ -1,5 +1,6 @@
>  Version 2.02.96 - 
>  ================================
> +  Disallow changing cluster attribute of VG while RAID LVs are active.
>    Fix lvconvert error message for non-mergeable volumes.
>    Allow subset of failed devices to be replaced in RAID LVs.
>    Prevent resume from creating error devices that already exist from suspend.
> --- LVM2/lib/metadata/vg.c	2012/02/13 11:04:00	1.17
> +++ LVM2/lib/metadata/vg.c	2012/04/25 13:38:42	1.18
> @@ -517,9 +517,11 @@
>  	 * on active mirrors or snapshots.
>  	 */
>  	dm_list_iterate_items(lvl, &vg->lvs) {
> -		if (lv_is_mirrored(lvl->lv) && lv_is_active(lvl->lv)) {
> -			log_error("Mirror logical volumes must be inactive "
> -				  "when changing the cluster attribute.");
> +		if (lv_is_active(lvl->lv) &&
> +		    (lv_is_mirrored(lvl->lv) || lv_is_raid_type(lvl->lv))) {
> +			log_error("%s logical volumes must be inactive "
> +				  "when changing the cluster attribute.",
> +				  lv_is_raid_type(lvl->lv) ? "RAID" : "Mirror");
>  			return 0;
>

Hmm - I'm quite confused here -

What is the point to check explicitly for 'raid' that  cluster bit cannot be
changed for VG?

Currently AFAIK it's not supported for any active LV  - i.e. current there is
no support for obtaining cluster locks during such conversion?

So shouldn't we rather prohibit conversions for now when any LV from VG is
active ?

Zdenek


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