From 72c4f6ea45e4c9bbd63796a7642aefba87717f72 Mon Sep 17 00:00:00 2001
From: yury <yury>
Date: Wed, 17 Dec 2008 22:00:14 +0000
Subject: [PATCH] b=17674 r=shadow,johann

- do not reset ns_connect_flags in reconnect if server was not upgraded
---
 lustre/ptlrpc/import.c      | 19 +++++++++++++++----
 lustre/tests/conf-sanity.sh | 38 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 53 insertions(+), 4 deletions(-)

diff --git a/lustre/ptlrpc/import.c b/lustre/ptlrpc/import.c
index 08e9f51..9d1efb3 100644
--- a/lustre/ptlrpc/import.c
+++ b/lustre/ptlrpc/import.c
@@ -761,6 +761,7 @@ static int ptlrpc_connect_interpret(const struct lu_env *env,
         struct obd_import *imp = request->rq_import;
         struct client_obd *cli = &imp->imp_obd->u.cli;
         struct lustre_handle old_hdl;
+        __u64 old_connect_flags;
         int msg_flags;
         ENTRY;
 
@@ -971,6 +972,7 @@ finish:
                                imp->imp_obd->obd_name);
                         GOTO(out, rc = -ENODEV);
                 }
+                old_connect_flags = exp->exp_connect_flags;
                 exp->exp_connect_flags = ocd->ocd_connect_flags;
                 imp->imp_obd->obd_self_export->exp_connect_flags =
                                                         ocd->ocd_connect_flags;
@@ -1047,10 +1049,19 @@ finish:
                                 ocd->ocd_brw_size >> CFS_PAGE_SHIFT;
                 }
 
-                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;
+                /* 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 lossing user settings done before such as
+                 * disable lru_resize, etc. */
+                if (old_connect_flags != exp->exp_connect_flags ||
+                    aa->pcaa_initial_connect) {
+                        CWARN("Reseting ns_connect_flags to server flags: "LPU64"\n", 
+                              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))
diff --git a/lustre/tests/conf-sanity.sh b/lustre/tests/conf-sanity.sh
index de84493..b1137e0 100644
--- a/lustre/tests/conf-sanity.sh
+++ b/lustre/tests/conf-sanity.sh
@@ -1532,6 +1532,44 @@ test_46a() {
 }
 run_test 46a "handle ost additional - wide striped file"
 
+test_47() { #17674
+        setup
+        check_mount || return 2
+        $LCTL set_param ldlm.namespaces.$FSNAME-*-*-*.lru_size=100
+
+        local lru_size=[]
+        local count=0
+        for ns in $($LCTL get_param ldlm.namespaces.$FSNAME-*-*-*.lru_size); do
+            if echo $ns | grep "MDT[[:digit:]]*"; then
+                continue
+            fi
+            lrs=$(echo $ns | sed 's/.*lru_size=//')
+            lru_size[count]=$lrs
+            let count=count+1
+        done
+ 
+        facet_failover ost1
+        facet_failover $SINGLEMDS
+        df -h $MOUNT || return 3
+
+        count=0
+        for ns in $($LCTL get_param ldlm.namespaces.$FSNAME-*-*-*.lru_size); do
+            if echo $ns | grep "MDT[[:digit:]]*"; then
+                continue
+            fi
+            lrs=$(echo $ns | sed 's/.*lru_size=//')
+            if ! test "$lrs" -eq "${lru_size[count]}"; then
+                n=$(echo $ns | sed -e 's/ldlm.namespaces.//' -e 's/.lru_size=.*//')
+                error "$n has lost lru_size: $lrs vs. ${lru_size[count]}"
+            fi
+            let count=count+1
+        done
+
+        cleanup
+        return 0
+}
+run_test 47 "server restart does not make client loss lru_resize settings"
+
 cleanup_gss
 equals_msg `basename $0`: test complete
 [ -f "$TESTSUITELOG" ] && cat $TESTSUITELOG && grep -q FAIL $TESTSUITELOG && exit 1 || true
-- 
1.8.3.1