dm thin metadata: pass correct space map to dm_sm_root_size
Fix a harmless typo. The root is a chunk of data that gets written to the superblock. This data is used to recreate the space map when opening a metadata area. We have two space maps; one tracking space on the metadata device and one of the data device. Both of these use the same format for their root, so this typo was harmless. Signed-off-by: Joe Thornber <ejt@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
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