[LVM2 PATCH] Fix lvcreate's checking of the number of PVs

[Jun'ichi Nomura <j-nomura@ce.jp.nec.com>]

Jun'ichi Nomura wrote:
> While not explained in man page, lvcreate can take tags of PVs
> as a specification of allocatable PVs.
> e.g. if you have 2 MD RAID1 disks and other disks in your vg,
>       you can do:
>        pvchange --addtag raid1 /dev/md[01]
>        lvcreate -L100M -i2 vg @raid1
>       instead of 'lvcreate -L100M -i2 vg /dev/md0 /dev/md1'
> 
> However, lvcreate checks the number of PVs based on the number of
> arguments, so it fails even if the number of PVs for the tag is many
> enough.
> 
> The same check is done later in the allocation code.
> So it's safe to remove the checks here.
> 
> A patch to fix this and a reproducer script is attached.

After the fix, 'argc' is no longer used and should be removed
in both _read_stripe_params() and _read_mirror_params().

This is the updated version of the patch.

Thanks,
-- 
Jun'ichi Nomura, NEC Corporation of America
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