dlm: use LSFL_FS to check for kernel lockspace

The existing external lockspace flag DLM_LSFL_FS is now also
saved as an internal flag LSFL_FS, so it can be checked from
other code locations which want to know if a lockspace is
used from the kernel or user space.

Signed-off-by: Alexander Aring <aahringo@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>

Author: Alexander Aring

fs/dlm/ast.c

@@ -161,6 +161,9 @@ void dlm_add_cb(struct dlm_lkb *lkb, uint32_t flags, int mode, int status,
 
 int dlm_callback_start(struct dlm_ls *ls)
 {
+	if (!test_bit(LSFL_FS, &ls->ls_flags))
+		return 0;
+
 	ls->ls_callback_wq = alloc_ordered_workqueue("dlm_callback",
 						     WQ_HIGHPRI | WQ_MEM_RECLAIM);
 	if (!ls->ls_callback_wq) {
@@ -178,13 +181,15 @@ void dlm_callback_stop(struct dlm_ls *ls)
 
 void dlm_callback_suspend(struct dlm_ls *ls)
 {
-	if (ls->ls_callback_wq) {
-		spin_lock_bh(&ls->ls_cb_lock);
-		set_bit(LSFL_CB_DELAY, &ls->ls_flags);
-		spin_unlock_bh(&ls->ls_cb_lock);
+	if (!test_bit(LSFL_FS, &ls->ls_flags))
+		return;
 
+	spin_lock_bh(&ls->ls_cb_lock);
+	set_bit(LSFL_CB_DELAY, &ls->ls_flags);
+	spin_unlock_bh(&ls->ls_cb_lock);
+
+	if (ls->ls_callback_wq)
 		flush_workqueue(ls->ls_callback_wq);
-	}
 }
 
 #define MAX_CB_QUEUE 25
@@ -195,7 +200,7 @@ void dlm_callback_resume(struct dlm_ls *ls)
 	int count = 0, sum = 0;
 	bool empty;
 
-	if (!ls->ls_callback_wq)
+	if (!test_bit(LSFL_FS, &ls->ls_flags))
 		return;
 
 more:

fs/dlm/dlm_internal.h

@@ -698,6 +698,7 @@ struct dlm_ls {
 #define LSFL_CB_DELAY		9
 #define LSFL_NODIR		10
 #define LSFL_RECV_MSG_BLOCKED	11
+#define LSFL_FS			12
 
 #define DLM_PROC_FLAGS_CLOSING 1
 #define DLM_PROC_FLAGS_COMPAT  2

fs/dlm/lockspace.c

@@ -499,12 +499,13 @@ static int new_lockspace(const char *name, const char *cluster,
 	list_add(&ls->ls_list, &lslist);
 	spin_unlock_bh(&lslist_lock);
 
-	if (flags & DLM_LSFL_FS) {
-		error = dlm_callback_start(ls);
-		if (error) {
-			log_error(ls, "can't start dlm_callback %d", error);
-			goto out_delist;
-		}
+	if (flags & DLM_LSFL_FS)
+		set_bit(LSFL_FS, &ls->ls_flags);
+
+	error = dlm_callback_start(ls);
+	if (error) {
+		log_error(ls, "can't start dlm_callback %d", error);
+		goto out_delist;
 	}
 
 	init_waitqueue_head(&ls->ls_recover_lock_wait);