LU-6086 obdclass: check peer's version for MDT-MDT connection

[fs/lustre-release.git] / lustre / ptlrpc / import.c

diff --git a/lustre/ptlrpc/import.c b/lustre/ptlrpc/import.c
index 224cad4..5d1e6b8 100644 (file)
--- a/lustre/ptlrpc/import.c
+++ b/lustre/ptlrpc/import.c
@@ -1014,6 +1014,32 @@ static int ptlrpc_connect_interpret(const struct lu_env *env,
                GOTO(out, rc = -EPROTO);
        }
 
+       if (!(imp->imp_connect_flags_orig & OBD_CONNECT_LIGHTWEIGHT) &&
+           (imp->imp_connect_flags_orig & OBD_CONNECT_MDS_MDS) &&
+           !(imp->imp_connect_flags_orig & OBD_CONNECT_IMP_RECOV) &&
+           (ocd->ocd_connect_flags & OBD_CONNECT_VERSION)) {
+               __u32 major = OBD_OCD_VERSION_MAJOR(ocd->ocd_version);
+               __u32 minor = OBD_OCD_VERSION_MINOR(ocd->ocd_version);
+               __u32 patch = OBD_OCD_VERSION_PATCH(ocd->ocd_version);
+
+               /* We do not support the MDT-MDT interoperations with
+                * different version MDT because of protocol changes. */
+               if (unlikely(major != LUSTRE_MAJOR ||
+                            minor != LUSTRE_MINOR ||
+                            abs(patch - LUSTRE_PATCH) > 3)) {
+                       LCONSOLE_WARN("%s: import %p (%u.%u.%u.%u) tried the "
+                                     "connection to different version MDT "
+                                     "(%d.%d.%d.%d) %s\n",
+                                     imp->imp_obd->obd_name, imp, LUSTRE_MAJOR,
+                                     LUSTRE_MINOR, LUSTRE_PATCH, LUSTRE_FIX,
+                                     major, minor, patch,
+                                     OBD_OCD_VERSION_FIX(ocd->ocd_version),
+                                     imp->imp_connection->c_remote_uuid.uuid);
+
+                       GOTO(out, rc = -EPROTO);
+               }
+       }
+
        if (!exp) {
                /* This could happen if export is cleaned during the
                   connect attempt */