Joe Thornber 993ceab919
dm thin metadata: fix bug in dm_thin_remove_range() ...
dm_btree_remove_leaves() only unmaps a contiguous region so we need a
loop, in __remove_range(), to handle ranges that contain multiple
regions.
A new btree function, dm_btree_lookup_next(), is introduced which is
more efficiently able to skip over regions of the thin device which
aren't mapped. __remove_range() uses dm_btree_lookup_next() for each
iteration of __remove_range()'s loop.
Also, improve description of dm_btree_remove_leaves().
Fixes: 6550f075ejt@redhat.com >
Signed-off-by: Mike Snitzer <snitzer@redhat.com >
Cc: stable@vger.kernel.org # 4.1+
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