ceph: check mds_wanted for imported cap

The MDS may have incorrect wanted caps after importing caps. So the
client should check the value mds has and send cap update if necessary.

Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
Reviewed-by: Sage Weil <sage@inktank.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index 40b5bbe63a39..1e1e02055a2b 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -2429,7 +2429,9 @@ static void handle_cap_grant(struct inode *inode, struct ceph_mds_caps *grant,
                 dout("mds wanted %s -> %s\n",
                      ceph_cap_string(le32_to_cpu(grant->wanted)),
                      ceph_cap_string(wanted));
-                grant->wanted = cpu_to_le32(wanted);
+                /* imported cap may not have correct mds_wanted */
+                if (le32_to_cpu(grant->op) == CEPH_CAP_OP_IMPORT)
+                        check_caps = 1;
         }
 
         cap->seq = seq;