Description of problem:

Conversion command to convert LV into a thin LV and making the given LV to be an  external origin for this LV is missing validation:

lvconvert --thinpool mvg/lvol1  --originname ext  -T mvg/lvol1

Command aborts too late, when some part of conversion already changed lvm2 metadata and change the table line.

  Logical volume "lvol1_tmeta" created
  Converted mvg/lvol1 to thin pool.
  Logical volume "ext" created
  Cannot rename internal LV "lvol1_tdata".
  Internal error: Referenced LV lvol1_tdata not listed in VG mvg.

As a consequence if the user wanted to convert lvol1 just to some real pool - he now already lost lvol1 (and has to use immediately deactive pool and vgcfgrestore lvm2 metadata).


Version-Release number of selected component (if applicable):
2.02.102

How reproducible:


Steps to Reproduce:
1. lvcreate -L10 -n lvol1
2. lvconvert --thinpool mvg/lvol1  --originname ext  -T mvg/lvol1
3.

Actual results:


Expected results:
Report incorrect parameters being passed in.

Additional info: