[ 90/95] dm thin metadata: decrement counter after removing mapped block

[Greg KH]

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Joe Thornber <ejt@xxxxxxxxxx>

commit af63bcb817cf708f53bcae6edc2e3fb7dd7d8051 upstream.

Correct the number of mapped sectors shown on a thin device's
status line by decrementing td->mapped_blocks in __remove() each time
a block is removed.

Signed-off-by: Joe Thornber <ejt@xxxxxxxxxx>
Acked-by: Mike Snitzer <snitzer@xxxxxxxxxx>
Signed-off-by: Alasdair G Kergon <agk@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/md/dm-thin-metadata.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/md/dm-thin-metadata.c
+++ b/drivers/md/dm-thin-metadata.c
@@ -1224,6 +1224,8 @@ static int __remove(struct dm_thin_devic
 	if (r)
 		return r;
 
+	td->mapped_blocks--;
+	td->changed = 1;
 	pmd->need_commit = 1;
 
 	return 0;


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