[PATCH] lvconvert: provide useful error when snapshot-merge target missing

[Milan Broz <mbroz@redhat.com>]

On 10/13/2010 08:53 PM, Mike Snitzer wrote:
> Convey need for snapshot-merge target in lvconvert error message and man
> page.

> --- a/lib/metadata/segtype.h
> +++ b/lib/metadata/segtype.h
> @@ -66,6 +66,7 @@ struct segment_type {
>  
>  struct segtype_handler {
>  	const char *(*name) (const struct lv_segment * seg);
> +	const char *(*target_name) (const struct lv_segment * seg);
>  	void (*display) (const struct lv_segment * seg);
>  	int (*text_export) (const struct lv_segment * seg,
>  			    struct formatter * f);

I think this will break shared (external) segment module ABI.
Nobody uses that but worth to mention it.
(See e.g. lib/mirror and --with-mirrors=shared)

Otherwise ack.

Milan