ceph: make sure write caps are registered with auth MDS

Only auth MDS can issue write caps to clients, so don't consider
write caps registered with non-auth MDS as valid.

Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index 17543383545c..d9ef44e5474e 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -885,7 +885,10 @@ int __ceph_caps_mds_wanted(struct ceph_inode_info *ci)
                 cap = rb_entry(p, struct ceph_cap, ci_node);
                 if (!__cap_is_valid(cap))
                         continue;
-                mds_wanted |= cap->mds_wanted;
+                if (cap == ci->i_auth_cap)
+                        mds_wanted |= cap->mds_wanted;
+                else
+                        mds_wanted |= (cap->mds_wanted & ~CEPH_CAP_ANY_FILE_WR);
         }
         return mds_wanted;
 }