LU-4943 obdclass: detach MGC dev on error

lustre_start_mgc() creates MGC device, if error happens later on
ll_fill_super(), this device is still attached, and later mount
fails by keep complaining that the MGC device's already in the
client node.

It turns out that the device was referenced by mgc config llog data
which is arranged in the mgc lock requeue thread re-trying to get its
mgc lock, and in normal case, this llog reference only released in
mgc_blocking_ast() when the system is umount.

This patch make mgc_precleanup() to wake up requeue thread to handle
the config llog data.

This patch also makes mgc_setup() wait for mgc_requeue_thread() start
before moving on.

Signed-off-by: Bobi Jam <bobijam.xu@intel.com>
Change-Id: I83df8c68c1dbe4ef4ee879e04ab20df46fea9062
Reviewed-on: http://review.whamcloud.com/10129
Tested-by: Jenkins
Reviewed-by: Niu Yawei <yawei.niu@intel.com>
Reviewed-by: Ryan Haasken <haasken@cray.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>

diff --git a/lustre/mgc/mgc_request.c b/lustre/mgc/mgc_request.c
index 774030c..e589edb 100644 (file)
--- a/lustre/mgc/mgc_request.c
+++ b/lustre/mgc/mgc_request.c
@@ -491,13 +491,15 @@ int lprocfs_mgc_rd_ir_state(struct seq_file *m, void *data)
 #endif
 
 /* reenqueue any lost locks */
-#define RQ_RUNNING 0x1
-#define RQ_NOW     0x2
-#define RQ_LATER   0x4
-#define RQ_STOP    0x8
+#define RQ_RUNNING     0x1
+#define RQ_NOW         0x2
+#define RQ_LATER       0x4
+#define RQ_STOP                0x8
+#define RQ_PRECLEANUP  0x10
 static int                    rq_state = 0;
 static wait_queue_head_t      rq_waitq;
 static DECLARE_COMPLETION(rq_exit);
+static DECLARE_COMPLETION(rq_start);
 
 static void do_requeue(struct config_llog_data *cld)
 {
@@ -533,12 +535,13 @@ static void do_requeue(struct config_llog_data *cld)
 
 static int mgc_requeue_thread(void *data)
 {
-        int rc = 0;
-        ENTRY;
+       int rc = 0;
+       bool first = true;
+       ENTRY;
 
-        CDEBUG(D_MGC, "Starting requeue thread\n");
+       CDEBUG(D_MGC, "Starting requeue thread\n");
 
-        /* Keep trying failed locks periodically */
+       /* Keep trying failed locks periodically */
        spin_lock(&config_list_lock);
        rq_state |= RQ_RUNNING;
        while (1) {
@@ -552,13 +555,19 @@ static int mgc_requeue_thread(void *data)
                rq_state &= ~(RQ_NOW | RQ_LATER);
                spin_unlock(&config_list_lock);
 
+               if (first) {
+                       first = false;
+                       complete(&rq_start);
+               }
+
                /* Always wait a few seconds to allow the server who
                   caused the lock revocation to finish its setup, plus some
                   random so everyone doesn't try to reconnect at once. */
                to = MGC_TIMEOUT_MIN_SECONDS * HZ;
                to += rand * HZ / 100; /* rand is centi-seconds */
                lwi = LWI_TIMEOUT(to, NULL, NULL);
-               l_wait_event(rq_waitq, rq_state & RQ_STOP, &lwi);
+               l_wait_event(rq_waitq, rq_state & (RQ_STOP | RQ_PRECLEANUP),
+                            &lwi);
 
                 /*
                  * iterate & processing through the list. for each cld, process
@@ -571,6 +580,7 @@ static int mgc_requeue_thread(void *data)
                 cld_prev = NULL;
 
                spin_lock(&config_list_lock);
+               rq_state &= ~RQ_PRECLEANUP;
                list_for_each_entry(cld, &config_llog_list,
                                        cld_list_chain) {
                        if (!cld->cld_lostlock)
@@ -842,6 +852,7 @@ static atomic_t mgc_count = ATOMIC_INIT(0);
 static int mgc_precleanup(struct obd_device *obd, enum obd_cleanup_stage stage)
 {
        int rc = 0;
+       int temp;
        ENTRY;
 
        switch (stage) {
@@ -849,18 +860,19 @@ static int mgc_precleanup(struct obd_device *obd, enum obd_cleanup_stage stage)
                break;
        case OBD_CLEANUP_EXPORTS:
                if (atomic_dec_and_test(&mgc_count)) {
-                       int running;
+                       LASSERT(rq_state & RQ_RUNNING);
                        /* stop requeue thread */
-                       spin_lock(&config_list_lock);
-                       running = rq_state & RQ_RUNNING;
-                       if (running)
-                               rq_state |= RQ_STOP;
-                       spin_unlock(&config_list_lock);
-                       if (running) {
-                               wake_up(&rq_waitq);
-                               wait_for_completion(&rq_exit);
-                       }
+                       temp = RQ_STOP;
+               } else {
+                       /* wakeup requeue thread to clean our cld */
+                       temp = RQ_NOW | RQ_PRECLEANUP;
                }
+               spin_lock(&config_list_lock);
+               rq_state |= temp;
+               spin_unlock(&config_list_lock);
+               wake_up(&rq_waitq);
+               if (temp & RQ_STOP)
+                       wait_for_completion(&rq_exit);
                obd_cleanup_client_import(obd);
                rc = mgc_llog_fini(NULL, obd);
                if (rc != 0)
@@ -929,6 +941,7 @@ static int mgc_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
                }
                /* rc is the task_struct pointer of mgc_requeue_thread. */
                rc = 0;
+               wait_for_completion(&rq_start);
        }
 
        RETURN(rc);