+static int ptlrpc_connect_set_flags(struct obd_import *imp,
+ struct obd_connect_data *ocd,
+ __u64 old_connect_flags,
+ struct obd_export *exp, int init_connect)
+{
+ static bool warned;
+ struct client_obd *cli = &imp->imp_obd->u.cli;
+
+ if ((imp->imp_connect_flags_orig & OBD_CONNECT_IBITS) &&
+ !(ocd->ocd_connect_flags & OBD_CONNECT_IBITS)) {
+ LCONSOLE_WARN("%s: MDS %s does not support ibits "
+ "lock, either very old or invalid: "
+ "requested "LPX64", replied "LPX64"\n",
+ imp->imp_obd->obd_name,
+ imp->imp_connection->c_remote_uuid.uuid,
+ imp->imp_connect_flags_orig,
+ ocd->ocd_connect_flags);
+ return -EPROTO;
+ }
+
+ spin_lock(&imp->imp_lock);
+ list_del(&imp->imp_conn_current->oic_item);
+ list_add(&imp->imp_conn_current->oic_item,
+ &imp->imp_conn_list);
+ imp->imp_last_success_conn =
+ imp->imp_conn_current->oic_last_attempt;
+
+ spin_unlock(&imp->imp_lock);
+
+
+ if (!warned && (ocd->ocd_connect_flags & OBD_CONNECT_VERSION) &&
+ (ocd->ocd_version > LUSTRE_VERSION_CODE +
+ LUSTRE_VERSION_OFFSET_WARN ||
+ ocd->ocd_version < LUSTRE_VERSION_CODE -
+ LUSTRE_VERSION_OFFSET_WARN)) {
+ /* Sigh, some compilers do not like #ifdef in the middle
+ of macro arguments */
+ const char *older = "older than client. "
+ "Consider upgrading server";
+ const char *newer = "newer than client. "
+ "Consider recompiling application";
+
+ LCONSOLE_WARN("Server %s version (%d.%d.%d.%d) "
+ "is much %s (%s)\n",
+ obd2cli_tgt(imp->imp_obd),
+ OBD_OCD_VERSION_MAJOR(ocd->ocd_version),
+ OBD_OCD_VERSION_MINOR(ocd->ocd_version),
+ OBD_OCD_VERSION_PATCH(ocd->ocd_version),
+ OBD_OCD_VERSION_FIX(ocd->ocd_version),
+ ocd->ocd_version > LUSTRE_VERSION_CODE ?
+ newer : older, LUSTRE_VERSION_STRING);
+ warned = true;
+ }
+
+#if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(3, 0, 53, 0)
+ /* Check if server has LU-1252 fix applied to not always swab
+ * the IR MNE entries. Do this only once per connection. This
+ * fixup is version-limited, because we don't want to carry the
+ * OBD_CONNECT_MNE_SWAB flag around forever, just so long as we
+ * need interop with unpatched 2.2 servers. For newer servers,
+ * the client will do MNE swabbing only as needed. LU-1644 */
+ if (unlikely((ocd->ocd_connect_flags & OBD_CONNECT_VERSION) &&
+ !(ocd->ocd_connect_flags & OBD_CONNECT_MNE_SWAB) &&
+ OBD_OCD_VERSION_MAJOR(ocd->ocd_version) == 2 &&
+ OBD_OCD_VERSION_MINOR(ocd->ocd_version) == 2 &&
+ OBD_OCD_VERSION_PATCH(ocd->ocd_version) < 55 &&
+ strcmp(imp->imp_obd->obd_type->typ_name,
+ LUSTRE_MGC_NAME) == 0))
+ imp->imp_need_mne_swab = 1;
+ else /* clear if server was upgraded since last connect */
+ imp->imp_need_mne_swab = 0;
+#endif
+
+ if (ocd->ocd_connect_flags & OBD_CONNECT_CKSUM) {
+ /* We sent to the server ocd_cksum_types with bits set
+ * for algorithms we understand. The server masked off
+ * the checksum types it doesn't support */
+ if ((ocd->ocd_cksum_types &
+ cksum_types_supported_client()) == 0) {
+ LCONSOLE_WARN("The negotiation of the checksum "
+ "alogrithm to use with server %s "
+ "failed (%x/%x), disabling "
+ "checksums\n",
+ obd2cli_tgt(imp->imp_obd),
+ ocd->ocd_cksum_types,
+ cksum_types_supported_client());
+ cli->cl_checksum = 0;
+ cli->cl_supp_cksum_types = OBD_CKSUM_ADLER;
+ } else {
+ cli->cl_supp_cksum_types = ocd->ocd_cksum_types;
+ }
+ } else {
+ /* The server does not support OBD_CONNECT_CKSUM.
+ * Enforce ADLER for backward compatibility*/
+ cli->cl_supp_cksum_types = OBD_CKSUM_ADLER;
+ }
+ cli->cl_cksum_type = cksum_type_select(cli->cl_supp_cksum_types);
+
+ if (ocd->ocd_connect_flags & OBD_CONNECT_BRW_SIZE)
+ cli->cl_max_pages_per_rpc =
+ min(ocd->ocd_brw_size >> PAGE_CACHE_SHIFT,
+ cli->cl_max_pages_per_rpc);
+ else if (imp->imp_connect_op == MDS_CONNECT ||
+ imp->imp_connect_op == MGS_CONNECT)
+ cli->cl_max_pages_per_rpc = 1;
+
+ LASSERT((cli->cl_max_pages_per_rpc <= PTLRPC_MAX_BRW_PAGES) &&
+ (cli->cl_max_pages_per_rpc > 0));
+
+ client_adjust_max_dirty(cli);
+
+
+ /* Reset ns_connect_flags only for initial connect. It might be
+ * changed in while using FS and if we reset it in reconnect
+ * this leads to losing user settings done before such as
+ * disable lru_resize, etc. */
+ if (old_connect_flags != exp_connect_flags(exp) || init_connect) {
+ CDEBUG(D_HA, "%s: Resetting ns_connect_flags to server "
+ "flags: "LPX64"\n", imp->imp_obd->obd_name,
+ ocd->ocd_connect_flags);
+ imp->imp_obd->obd_namespace->ns_connect_flags =
+ ocd->ocd_connect_flags;
+ imp->imp_obd->obd_namespace->ns_orig_connect_flags =
+ ocd->ocd_connect_flags;
+ }
+
+ if ((ocd->ocd_connect_flags & OBD_CONNECT_AT) &&
+ (imp->imp_msg_magic == LUSTRE_MSG_MAGIC_V2))
+ /* We need a per-message support flag, because
+ * a. we don't know if the incoming connect reply
+ * supports AT or not (in reply_in_callback)
+ * until we unpack it.
+ * b. failovered server means export and flags are gone
+ * (in ptlrpc_send_reply).
+ * Can only be set when we know AT is supported at
+ * both ends */
+ imp->imp_msghdr_flags |= MSGHDR_AT_SUPPORT;
+ else
+ imp->imp_msghdr_flags &= ~MSGHDR_AT_SUPPORT;
+
+ if ((ocd->ocd_connect_flags & OBD_CONNECT_FULL20) &&
+ (imp->imp_msg_magic == LUSTRE_MSG_MAGIC_V2))
+ imp->imp_msghdr_flags |= MSGHDR_CKSUM_INCOMPAT18;
+ else
+ imp->imp_msghdr_flags &= ~MSGHDR_CKSUM_INCOMPAT18;
+
+ return 0;
+}
+