dm thin metadata: decrement counter after removing mapped block

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 <[email protected]>
Acked-by: Mike Snitzer <[email protected]>
Cc: [email protected]
Signed-off-by: Alasdair G Kergon <[email protected]>

diff --git a/drivers/md/dm-thin-metadata.c b/drivers/md/dm-thin-metadata.c
index 05b7ffc030edbf1223214245511353383ed79f8c..237571af77fdfcf552b7061fa13ff291514c86b7 100644 (file)
--- a/drivers/md/dm-thin-metadata.c
+++ b/drivers/md/dm-thin-metadata.c
@@ -1224,6 +1224,8 @@ static int __remove(struct dm_thin_device *td, dm_block_t block)
        if (r)
                return r;
 
+       td->mapped_blocks--;
+       td->changed = 1;
        pmd->need_commit = 1;
 
        return 0;