ceph: implemented caps should always be superset of issued caps

Added assertion, and cleared one case where the implemented caps were
not following the issued caps.

Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net>
Signed-off-by: Sage Weil <sage@newdream.net>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index db122bb357b..57d9b44a882 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -2334,6 +2334,7 @@ static int handle_cap_grant(struct inode *inode, struct ceph_mds_caps *grant,
                            revoked_rdcache)
                         reply = 2;     /* send revoke ack in check_caps */
                 cap->issued = newcaps;
+                cap->implemented |= newcaps;
         } else if (cap->issued == newcaps) {
                 dout("caps unchanged: %s -> %s\n",
                      ceph_cap_string(cap->issued), ceph_cap_string(newcaps));
@@ -2346,6 +2347,7 @@ static int handle_cap_grant(struct inode *inode, struct ceph_mds_caps *grant,
                                               * pending revocation */
                 wake = 1;
         }
+        BUG_ON(cap->issued & ~cap->implemented);
 
         spin_unlock(&inode->i_lock);
         if (writeback)