ocfs2_dlm: Calling post handler function in assert master handler

This patch prevents the dlm from sending the clear refmap message
before the set refmap. We use the newly created post function handler
routine to accomplish the task.

Signed-off-by: Kurt Hackel <kurt.hackel@oracle.com>
Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>

4 files changed, 29 insertions, 4 deletions

diff --git a/fs/ocfs2/dlm/dlmcommon.h b/fs/ocfs2/dlm/dlmcommon.h
index 2df6fde3e652..3f554711efe5 100644
--- a/fs/ocfs2/dlm/dlmcommon.h
+++ b/fs/ocfs2/dlm/dlmcommon.h
@@ -224,6 +224,7 @@ static inline void __dlm_set_joining_node(struct dlm_ctxt *dlm,
 #define DLM_LOCK_RES_MIGRATING            0x00000020
 #define DLM_LOCK_RES_DROPPING_REF         0x00000040
 #define DLM_LOCK_RES_BLOCK_DIRTY          0x00001000
+#define DLM_LOCK_RES_SETREF_INPROG        0x00002000
 
 /* max milliseconds to wait to sync up a network failure with a node death */
 #define DLM_NODE_DEATH_WAIT_MAX (5 * 1000)
@@ -879,6 +880,7 @@ int dlm_master_request_handler(struct o2net_msg *msg, u32 len, void *data,
                                void **ret_data);
 int dlm_assert_master_handler(struct o2net_msg *msg, u32 len, void *data,
                               void **ret_data);
+void dlm_assert_master_post_handler(int status, void *data, void *ret_data);
 int dlm_deref_lockres_handler(struct o2net_msg *msg, u32 len, void *data,
                               void **ret_data);
 int dlm_migrate_request_handler(struct o2net_msg *msg, u32 len, void *data,
diff --git a/fs/ocfs2/dlm/dlmdomain.c b/fs/ocfs2/dlm/dlmdomain.c
index 8a208b06fdd7..6590e1bca23c 100644
--- a/fs/ocfs2/dlm/dlmdomain.c
+++ b/fs/ocfs2/dlm/dlmdomain.c
@@ -1101,7 +1101,8 @@ static int dlm_register_domain_handlers(struct dlm_ctxt *dlm)
         status = o2net_register_handler(DLM_ASSERT_MASTER_MSG, dlm->key,
                                         sizeof(struct dlm_assert_master),
                                         dlm_assert_master_handler,
-                                        dlm, NULL, &dlm->dlm_domain_handlers);
+                                        dlm, dlm_assert_master_post_handler,
+                                        &dlm->dlm_domain_handlers);
         if (status)
                 goto bail;
 
diff --git a/fs/ocfs2/dlm/dlmmaster.c b/fs/ocfs2/dlm/dlmmaster.c
index bd1268778b66..84f36db8ada3 100644
--- a/fs/ocfs2/dlm/dlmmaster.c
+++ b/fs/ocfs2/dlm/dlmmaster.c
@@ -2036,8 +2036,12 @@ ok:
 
 done:
         ret = 0;
-        if (res)
-                dlm_lockres_put(res);
+        if (res) {
+                spin_lock(&res->spinlock);
+                res->state |= DLM_LOCK_RES_SETREF_INPROG;
+                spin_unlock(&res->spinlock);
+                *ret_data = (void *)res;
+        }
         dlm_put(dlm);
         if (master_request) {
                 mlog(0, "need to tell master to reassert\n");
@@ -2064,11 +2068,25 @@ kill:
         __dlm_print_one_lock_resource(res);
         spin_unlock(&res->spinlock);
         spin_unlock(&dlm->spinlock);
-        dlm_lockres_put(res);
+        *ret_data = (void *)res; 
         dlm_put(dlm);
         return -EINVAL;
 }
 
+void dlm_assert_master_post_handler(int status, void *data, void *ret_data)
+{
+        struct dlm_lock_resource *res = (struct dlm_lock_resource *)ret_data;
+
+        if (ret_data) {
+                spin_lock(&res->spinlock);
+                res->state &= ~DLM_LOCK_RES_SETREF_INPROG;
+                spin_unlock(&res->spinlock);
+                wake_up(&res->wq);
+                dlm_lockres_put(res);
+        }
+        return;
+}
+
 int dlm_dispatch_assert_master(struct dlm_ctxt *dlm,
                                struct dlm_lock_resource *res,
                                int ignore_higher, u8 request_from, u32 flags)
diff --git a/fs/ocfs2/dlm/dlmthread.c b/fs/ocfs2/dlm/dlmthread.c
index 3b94e4dec351..8ffa0916eb86 100644
--- a/fs/ocfs2/dlm/dlmthread.c
+++ b/fs/ocfs2/dlm/dlmthread.c
@@ -176,6 +176,10 @@ static int dlm_purge_lockres(struct dlm_ctxt *dlm,
              res->lockname.name, master);
 
         if (!master) {
+                spin_lock(&res->spinlock);
+                /* This ensures that clear refmap is sent after the set */
+                __dlm_wait_on_lockres_flags(res, DLM_LOCK_RES_SETREF_INPROG);
+                spin_unlock(&res->spinlock);
                 /* drop spinlock to do messaging, retake below */
                 spin_unlock(&dlm->spinlock);
                 /* clear our bit from the master's refmap, ignore errors */