[PATCH] Cleanup partial failure of activation

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

Hi,

If activate_lv() fails, callers won't call deactivate_lv().
However, activate_lv() may succeeded activation partially.

For example, in this case: (with the latest 2.02.29-cvs)
  # dmsetup create --notable vg-lv0_mimage_0
  # lvcreate -l1 -m1 -nlv0 vg

lvcreate fails. "lv0", "lv0_mimage_0", "lv0_mimage_1" and "lv0_mlog"
are once created but removed from the VG metadata. That's ok.
However, maps of vg-lv0 and vg-lv0_mlog remain in kernel.

Attached patch deactivates a partially activated LV so that
callers of activate_lv() don't need to care about partial failure.

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