t_group type of raid set in DMRAID

[Heinz Mauelshagen]

On Thu, Jul 05, 2007 at 04:40:21PM -0700, Fang, Ying wrote:
> Hello,
> 
> I'd like to know if the t_group type of raid set is mandatory or
> optional if a group of disks can hold more than one raid sets, such as
> ISW's volumes.

It is optional.
I designed it to address the needs of metadata formats such as isw or ddf1.

> 
> Also, I don't understand why "len2>len1" matters in the following
> function in metadata.c. It screws up -s option usage for the ISW handler
> as the group set name is smaller than that of a real raid set.

The idea was to support substrings in names.
The better solution would be regular expressions because of the
shortcomming you spotted.

Heinz

> 
> /*
>  * Group RAID set(s)
>  *
>  *	name = NULL  : build all sets
>  *	name = String: build just the one set
>  */
> static void want_set(struct lib_context *lc, struct raid_set *rs, char
> *name)
> {
> 	if (name) {
> 		size_t len1 = strlen(rs->name), len2 = strlen(name);
> 
> 		if (len2 > len1 ||  /*(---ying questions this
> condition!)*/
> 		    strncmp(rs->name, name, min(len1, len2))) {
> 			log_notice(lc, "dropping unwanted RAID set
> \"%s\"",
> 				   rs->name);
> 			free_raid_set(lc, rs);
> 		}
> 	}
> }
> 
> 
> Thanks,
> Ying 
> 
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