[dm-devel] [PATCH 13/13] dm thin: pre-commit in pool_status so it provides accurate free block counts

[Mike Snitzer]

From: Heinz Mauelshagen <heinzm at redhat.com>

If we're in the middle of a transaction the free block counts can be
quite out of date, so do a quick commit to update them.

Signed-off-by: Heinz Mauelshagen <heinzm at redhat.com>
Signed-off-by: Joe Thornber <thornber at redhat.com>
Acked-by: Mike Snitzer <snitzer at redhat.com>
---
 drivers/md/dm-thin.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index 2e16b3a..2b1d5bd 100644
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -2343,6 +2343,15 @@ static int pool_status(struct dm_target *ti, status_type_t type,
 		if (r)
 			return r;
 
+		/*
+		 * If we're in the middle of a transaction the free block
+		 * counts can be quite out of date, so we do a quick
+		 * commit.
+		 */
+		r = dm_pool_commit_metadata(pool->pmd);
+		if (r)
+			return r;
+
 		r = dm_pool_get_free_metadata_block_count(pool->pmd,
 							  &nr_free_blocks_metadata);
 		if (r)
-- 
1.7.1