1 files changed, 88 insertions, 87 deletions

diff --git a/fs/ocfs2/dlm/dlmmaster.c b/fs/ocfs2/dlm/dlmmaster.c
index 11eefb8c12e..005261c333b 100644
--- a/fs/ocfs2/dlm/dlmmaster.c
+++ b/fs/ocfs2/dlm/dlmmaster.c
@@ -631,39 +631,54 @@ error:
         return NULL;
 }
 
-void __dlm_lockres_grab_inflight_ref(struct dlm_ctxt *dlm,
-                                   struct dlm_lock_resource *res,
-                                   int new_lockres,
-                                   const char *file,
-                                   int line)
+void dlm_lockres_set_refmap_bit(struct dlm_ctxt *dlm,
+                                struct dlm_lock_resource *res, int bit)
 {
-        if (!new_lockres)
-                assert_spin_locked(&res->spinlock);
+        assert_spin_locked(&res->spinlock);
+
+        mlog(0, "res %.*s, set node %u, %ps()\n", res->lockname.len,
+             res->lockname.name, bit, __builtin_return_address(0));
+
+        set_bit(bit, res->refmap);
+}
+
+void dlm_lockres_clear_refmap_bit(struct dlm_ctxt *dlm,
+                                  struct dlm_lock_resource *res, int bit)
+{
+        assert_spin_locked(&res->spinlock);
+
+        mlog(0, "res %.*s, clr node %u, %ps()\n", res->lockname.len,
+             res->lockname.name, bit, __builtin_return_address(0));
+
+        clear_bit(bit, res->refmap);
+}
+
+
+void dlm_lockres_grab_inflight_ref(struct dlm_ctxt *dlm,
+                                   struct dlm_lock_resource *res)
+{
+        assert_spin_locked(&res->spinlock);
 
-        if (!test_bit(dlm->node_num, res->refmap)) {
-                BUG_ON(res->inflight_locks != 0);
-                dlm_lockres_set_refmap_bit(dlm->node_num, res);
-        }
         res->inflight_locks++;
-        mlog(0, "%s:%.*s: inflight++: now %u\n",
-             dlm->name, res->lockname.len, res->lockname.name,
-             res->inflight_locks);
+
+        mlog(0, "%s: res %.*s, inflight++: now %u, %ps()\n", dlm->name,
+             res->lockname.len, res->lockname.name, res->inflight_locks,
+             __builtin_return_address(0));
 }
 
-void __dlm_lockres_drop_inflight_ref(struct dlm_ctxt *dlm,
-                                   struct dlm_lock_resource *res,
-                                   const char *file,
-                                   int line)
+void dlm_lockres_drop_inflight_ref(struct dlm_ctxt *dlm,
+                                   struct dlm_lock_resource *res)
 {
         assert_spin_locked(&res->spinlock);
 
         BUG_ON(res->inflight_locks == 0);
+
         res->inflight_locks--;
-        mlog(0, "%s:%.*s: inflight--: now %u\n",
-             dlm->name, res->lockname.len, res->lockname.name,
-             res->inflight_locks);
-        if (res->inflight_locks == 0)
-                dlm_lockres_clear_refmap_bit(dlm->node_num, res);
+
+        mlog(0, "%s: res %.*s, inflight--: now %u, %ps()\n", dlm->name,
+             res->lockname.len, res->lockname.name, res->inflight_locks,
+             __builtin_return_address(0));
+
         wake_up(&res->wq);
 }
 
@@ -697,7 +712,6 @@ struct dlm_lock_resource * dlm_get_lock_resource(struct dlm_ctxt *dlm,
         unsigned int hash;
         int tries = 0;
         int bit, wait_on_recovery = 0;
-        int drop_inflight_if_nonlocal = 0;
 
         BUG_ON(!lockid);
 
@@ -709,36 +723,33 @@ lookup:
         spin_lock(&dlm->spinlock);
         tmpres = __dlm_lookup_lockres_full(dlm, lockid, namelen, hash);
         if (tmpres) {
-                int dropping_ref = 0;
-
                 spin_unlock(&dlm->spinlock);
-
                 spin_lock(&tmpres->spinlock);
-                /* We wait for the other thread that is mastering the resource */
+                /* Wait on the thread that is mastering the resource */
                 if (tmpres->owner == DLM_LOCK_RES_OWNER_UNKNOWN) {
                         __dlm_wait_on_lockres(tmpres);
                         BUG_ON(tmpres->owner == DLM_LOCK_RES_OWNER_UNKNOWN);
+                        spin_unlock(&tmpres->spinlock);
+                        dlm_lockres_put(tmpres);
+                        tmpres = NULL;
+                        goto lookup;
                 }
 
-                if (tmpres->owner == dlm->node_num) {
-                        BUG_ON(tmpres->state & DLM_LOCK_RES_DROPPING_REF);
-                        dlm_lockres_grab_inflight_ref(dlm, tmpres);
-                } else if (tmpres->state & DLM_LOCK_RES_DROPPING_REF)
-                        dropping_ref = 1;
-                spin_unlock(&tmpres->spinlock);
-
-                /* wait until done messaging the master, drop our ref to allow
-                 * the lockres to be purged, start over. */
-                if (dropping_ref) {
-                        spin_lock(&tmpres->spinlock);
-                        __dlm_wait_on_lockres_flags(tmpres, DLM_LOCK_RES_DROPPING_REF);
+                /* Wait on the resource purge to complete before continuing */
+                if (tmpres->state & DLM_LOCK_RES_DROPPING_REF) {
+                        BUG_ON(tmpres->owner == dlm->node_num);
+                        __dlm_wait_on_lockres_flags(tmpres,
+                                                    DLM_LOCK_RES_DROPPING_REF);
                         spin_unlock(&tmpres->spinlock);
                         dlm_lockres_put(tmpres);
                         tmpres = NULL;
                         goto lookup;
                 }
 
-                mlog(0, "found in hash!\n");
+                /* Grab inflight ref to pin the resource */
+                dlm_lockres_grab_inflight_ref(dlm, tmpres);
+
+                spin_unlock(&tmpres->spinlock);
                 if (res)
                         dlm_lockres_put(res);
                 res = tmpres;
@@ -829,8 +840,8 @@ lookup:
                  * but they might own this lockres.  wait on them. */
                 bit = find_next_bit(dlm->recovery_map, O2NM_MAX_NODES, 0);
                 if (bit < O2NM_MAX_NODES) {
-                        mlog(ML_NOTICE, "%s:%.*s: at least one node (%d) to "
-                             "recover before lock mastery can begin\n",
+                        mlog(0, "%s: res %.*s, At least one node (%d) "
+                             "to recover before lock mastery can begin\n",
                              dlm->name, namelen, (char *)lockid, bit);
                         wait_on_recovery = 1;
                 }
@@ -843,12 +854,11 @@ lookup:
 
         /* finally add the lockres to its hash bucket */
         __dlm_insert_lockres(dlm, res);
-        /* since this lockres is new it doesn't not require the spinlock */
-        dlm_lockres_grab_inflight_ref_new(dlm, res);
 
-        /* if this node does not become the master make sure to drop
-         * this inflight reference below */
-        drop_inflight_if_nonlocal = 1;
+        /* Grab inflight ref to pin the resource */
+        spin_lock(&res->spinlock);
+        dlm_lockres_grab_inflight_ref(dlm, res);
+        spin_unlock(&res->spinlock);
 
         /* get an extra ref on the mle in case this is a BLOCK
          * if so, the creator of the BLOCK may try to put the last
@@ -864,8 +874,8 @@ redo_request:
                  * dlm spinlock would be detectable be a change on the mle,
                  * so we only need to clear out the recovery map once. */
                 if (dlm_is_recovery_lock(lockid, namelen)) {
-                        mlog(ML_NOTICE, "%s: recovery map is not empty, but "
-                             "must master $RECOVERY lock now\n", dlm->name);
+                        mlog(0, "%s: Recovery map is not empty, but must "
+                             "master $RECOVERY lock now\n", dlm->name);
                         if (!dlm_pre_master_reco_lockres(dlm, res))
                                 wait_on_recovery = 0;
                         else {
@@ -883,8 +893,8 @@ redo_request:
                 spin_lock(&dlm->spinlock);
                 bit = find_next_bit(dlm->recovery_map, O2NM_MAX_NODES, 0);
                 if (bit < O2NM_MAX_NODES) {
-                        mlog(ML_NOTICE, "%s:%.*s: at least one node (%d) to "
-                             "recover before lock mastery can begin\n",
+                        mlog(0, "%s: res %.*s, At least one node (%d) "
+                             "to recover before lock mastery can begin\n",
                              dlm->name, namelen, (char *)lockid, bit);
                         wait_on_recovery = 1;
                 } else
@@ -913,8 +923,8 @@ redo_request:
                          * yet, keep going until it does.  this is how the
                          * master will know that asserts are needed back to
                          * the lower nodes. */
-                        mlog(0, "%s:%.*s: requests only up to %u but master "
-                             "is %u, keep going\n", dlm->name, namelen,
+                        mlog(0, "%s: res %.*s, Requests only up to %u but "
+                             "master is %u, keep going\n", dlm->name, namelen,
                              lockid, nodenum, mle->master);
                 }
         }
@@ -924,13 +934,12 @@ wait:
         ret = dlm_wait_for_lock_mastery(dlm, res, mle, &blocked);
         if (ret < 0) {
                 wait_on_recovery = 1;
-                mlog(0, "%s:%.*s: node map changed, redo the "
-                     "master request now, blocked=%d\n",
-                     dlm->name, res->lockname.len,
+                mlog(0, "%s: res %.*s, Node map changed, redo the master "
+                     "request now, blocked=%d\n", dlm->name, res->lockname.len,
                      res->lockname.name, blocked);
                 if (++tries > 20) {
-                        mlog(ML_ERROR, "%s:%.*s: spinning on "
-                             "dlm_wait_for_lock_mastery, blocked=%d\n",
+                        mlog(ML_ERROR, "%s: res %.*s, Spinning on "
+                             "dlm_wait_for_lock_mastery, blocked = %d\n",
                              dlm->name, res->lockname.len,
                              res->lockname.name, blocked);
                         dlm_print_one_lock_resource(res);
@@ -940,7 +949,8 @@ wait:
                 goto redo_request;
         }
 
-        mlog(0, "lockres mastered by %u\n", res->owner);
+        mlog(0, "%s: res %.*s, Mastered by %u\n", dlm->name, res->lockname.len,
+             res->lockname.name, res->owner);
         /* make sure we never continue without this */
         BUG_ON(res->owner == O2NM_MAX_NODES);
 
@@ -952,8 +962,6 @@ wait:
 
 wake_waiters:
         spin_lock(&res->spinlock);
-        if (res->owner != dlm->node_num && drop_inflight_if_nonlocal)
-                dlm_lockres_drop_inflight_ref(dlm, res);
         res->state &= ~DLM_LOCK_RES_IN_PROGRESS;
         spin_unlock(&res->spinlock);
         wake_up(&res->wq);
@@ -1426,9 +1434,7 @@ way_up_top:
                 }
 
                 if (res->owner == dlm->node_num) {
-                        mlog(0, "%s:%.*s: setting bit %u in refmap\n",
-                             dlm->name, namelen, name, request->node_idx);
-                        dlm_lockres_set_refmap_bit(request->node_idx, res);
+                        dlm_lockres_set_refmap_bit(dlm, res, request->node_idx);
                         spin_unlock(&res->spinlock);
                         response = DLM_MASTER_RESP_YES;
                         if (mle)
@@ -1493,10 +1499,8 @@ way_up_top:
                                  * go back and clean the mles on any
                                  * other nodes */
                                 dispatch_assert = 1;
-                                dlm_lockres_set_refmap_bit(request->node_idx, res);
-                                mlog(0, "%s:%.*s: setting bit %u in refmap\n",
-                                     dlm->name, namelen, name,
-                                     request->node_idx);
+                                dlm_lockres_set_refmap_bit(dlm, res,
+                                                           request->node_idx);
                         } else
                                 response = DLM_MASTER_RESP_NO;
                 } else {
@@ -1702,7 +1706,7 @@ again:
                              "lockres, set the bit in the refmap\n",
                              namelen, lockname, to);
                         spin_lock(&res->spinlock);
-                        dlm_lockres_set_refmap_bit(to, res);
+                        dlm_lockres_set_refmap_bit(dlm, res, to);
                         spin_unlock(&res->spinlock);
                 }
         }
@@ -2187,8 +2191,6 @@ int dlm_drop_lockres_ref(struct dlm_ctxt *dlm, struct dlm_lock_resource *res)
         namelen = res->lockname.len;
         BUG_ON(namelen > O2NM_MAX_NAME_LEN);
 
-        mlog(0, "%s:%.*s: sending deref to %d\n",
-             dlm->name, namelen, lockname, res->owner);
         memset(&deref, 0, sizeof(deref));
         deref.node_idx = dlm->node_num;
         deref.namelen = namelen;
@@ -2197,14 +2199,12 @@ int dlm_drop_lockres_ref(struct dlm_ctxt *dlm, struct dlm_lock_resource *res)
         ret = o2net_send_message(DLM_DEREF_LOCKRES_MSG, dlm->key,
                                  &deref, sizeof(deref), res->owner, &r);
         if (ret < 0)
-                mlog(ML_ERROR, "Error %d when sending message %u (key 0x%x) to "
-                     "node %u\n", ret, DLM_DEREF_LOCKRES_MSG, dlm->key,
-                     res->owner);
+                mlog(ML_ERROR, "%s: res %.*s, error %d send DEREF to node %u\n",
+                     dlm->name, namelen, lockname, ret, res->owner);
         else if (r < 0) {
                 /* BAD.  other node says I did not have a ref. */
-                mlog(ML_ERROR,"while dropping ref on %s:%.*s "
-                    "(master=%u) got %d.\n", dlm->name, namelen,
-                    lockname, res->owner, r);
+                mlog(ML_ERROR, "%s: res %.*s, DEREF to node %u got %d\n",
+                     dlm->name, namelen, lockname, res->owner, r);
                 dlm_print_one_lock_resource(res);
                 BUG();
         }
@@ -2260,7 +2260,7 @@ int dlm_deref_lockres_handler(struct o2net_msg *msg, u32 len, void *data,
         else {
                 BUG_ON(res->state & DLM_LOCK_RES_DROPPING_REF);
                 if (test_bit(node, res->refmap)) {
-                        dlm_lockres_clear_refmap_bit(node, res);
+                        dlm_lockres_clear_refmap_bit(dlm, res, node);
                         cleared = 1;
                 }
         }
@@ -2320,7 +2320,7 @@ static void dlm_deref_lockres_worker(struct dlm_work_item *item, void *data)
         BUG_ON(res->state & DLM_LOCK_RES_DROPPING_REF);
         if (test_bit(node, res->refmap)) {
                 __dlm_wait_on_lockres_flags(res, DLM_LOCK_RES_SETREF_INPROG);
-                dlm_lockres_clear_refmap_bit(node, res);
+                dlm_lockres_clear_refmap_bit(dlm, res, node);
                 cleared = 1;
         }
         spin_unlock(&res->spinlock);
@@ -2802,7 +2802,8 @@ static void dlm_remove_nonlocal_locks(struct dlm_ctxt *dlm,
                                 BUG_ON(!list_empty(&lock->bast_list));
                                 BUG_ON(lock->ast_pending);
                                 BUG_ON(lock->bast_pending);
-                                dlm_lockres_clear_refmap_bit(lock->ml.node, res);
+                                dlm_lockres_clear_refmap_bit(dlm, res,
+                                                             lock->ml.node);
                                 list_del_init(&lock->list);
                                 dlm_lock_put(lock);
                                 /* In a normal unlock, we would have added a
@@ -2823,7 +2824,7 @@ static void dlm_remove_nonlocal_locks(struct dlm_ctxt *dlm,
                         mlog(0, "%s:%.*s: node %u had a ref to this "
                              "migrating lockres, clearing\n", dlm->name,
                              res->lockname.len, res->lockname.name, bit);
-                        dlm_lockres_clear_refmap_bit(bit, res);
+                        dlm_lockres_clear_refmap_bit(dlm, res, bit);
                 }
                 bit++;
         }
@@ -2916,9 +2917,9 @@ static int dlm_do_migrate_request(struct dlm_ctxt *dlm,
                                          &migrate, sizeof(migrate), nodenum,
                                          &status);
                 if (ret < 0) {
-                        mlog(ML_ERROR, "Error %d when sending message %u (key "
-                             "0x%x) to node %u\n", ret, DLM_MIGRATE_REQUEST_MSG,
-                             dlm->key, nodenum);
+                        mlog(ML_ERROR, "%s: res %.*s, Error %d send "
+                             "MIGRATE_REQUEST to node %u\n", dlm->name,
+                             migrate.namelen, migrate.name, ret, nodenum);
                         if (!dlm_is_host_down(ret)) {
                                 mlog(ML_ERROR, "unhandled error=%d!\n", ret);
                                 BUG();
@@ -2937,7 +2938,7 @@ static int dlm_do_migrate_request(struct dlm_ctxt *dlm,
                              dlm->name, res->lockname.len, res->lockname.name,
                              nodenum);
                         spin_lock(&res->spinlock);
-                        dlm_lockres_set_refmap_bit(nodenum, res);
+                        dlm_lockres_set_refmap_bit(dlm, res, nodenum);
                         spin_unlock(&res->spinlock);
                 }
         }
@@ -3271,7 +3272,7 @@ int dlm_finish_migration(struct dlm_ctxt *dlm, struct dlm_lock_resource *res,
          * mastery reference here since old_master will briefly have
          * a reference after the migration completes */
         spin_lock(&res->spinlock);
-        dlm_lockres_set_refmap_bit(old_master, res);
+        dlm_lockres_set_refmap_bit(dlm, res, old_master);
         spin_unlock(&res->spinlock);
 
         mlog(0, "now time to do a migrate request to other nodes\n");