LU-15900 hsm: don't return error on state change during mount

HSM coordinator is started in stopped state always, but
mount may have hsm_control parameters 'disabled'. Such
parameter cause wrong state change so mount would fail
with error.

Treat parameter change from 'stopping/stopped' to 'disabled'
as not critical error, keep state unchanged and report
no error back to a caller.

Signed-off-by: Mikhail Pershin <mpershin@whamcloud.com>
Change-Id: I9d1366423391971b9511c46b6aed39d21ebf637c

diff --git a/lustre/mdt/mdt_coordinator.c b/lustre/mdt/mdt_coordinator.c
index 0ff12de..d0885d0 100644 (file)
--- a/lustre/mdt/mdt_coordinator.c
+++ b/lustre/mdt/mdt_coordinator.c
@@ -2295,9 +2295,10 @@ ssize_t hsm_control_store(struct kobject *kobj, struct attribute *attr,
                           strlen(CDT_DISABLE_CMD)) == 0) {
                if ((cdt->cdt_state == CDT_STOPPING) ||
                    (cdt->cdt_state == CDT_STOPPED)) {
-                       CERROR("%s: Coordinator is stopped\n",
-                              mdt_obd_name(mdt));
-                       rc = -EINVAL;
+                       /* exit gracefully if coordinator is being stopped
+                        * or stopped already.
+                        */
+                       rc = 0;
                } else {
                        rc = set_cdt_state(cdt, CDT_DISABLE);
                }