[PATCH 1/2] rbd: fix reference leak in rbd_do_op()

[Alex Elder <elder@inktank.com>]

This commit introduced a bug:
    4634246d rbd: consolidate rbd_do_op() calls

When a read request is being issued, the snapshot context provided
isn't needed.  But that snap context pointer was acquired in
rbd_rq_fn() and it carries with it a reference to that structure.
So before discarding it, the reference needs to be dropped.

Signed-off-by: Alex Elder <elder@inktank.com>
---
 drivers/block/rbd.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 835153e..b86f5e5 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -1333,6 +1333,7 @@ static int rbd_do_op(struct request *rq,
 	} else {
 		opcode = CEPH_OSD_OP_READ;
 		flags = CEPH_OSD_FLAG_READ;
+		ceph_put_snap_context(snapc);
 		snapc = NULL;
 		snapid = rbd_dev->spec->snap_id;
 		payload_len = 0;
-- 
1.7.9.5