The VFS lock patch is limited to sync'ing one filesystem at a time. This means
that only one snapshot can be created during a single commit. This fix prevents
the snapshot engine plugin from trying to activate a new snapshot when one
is already waiting to be activated.

Index: Plugins/snapshot/snapshot.c
===================================================================
RCS file: /chillywilly/CVS_Root/evms-1.2.0-cvs-root/engine/Plugins/snapshot/snapshot.c,v
retrieving revision 1.87
retrieving revision 1.88
diff -u -r1.87 -r1.88
--- Plugins/snapshot/snapshot.c	2002/09/10 14:00:35	1.87
+++ Plugins/snapshot/snapshot.c	2002/12/03 17:32:26	1.88
@@ -50,6 +50,7 @@
 
 static engine_mode_t                      engine_mode;
 static engine_functions_t                 *EngFncs=NULL;
+static int                                pending_volume=FALSE;
 
 /* Macro: SET_POWER2_LIST
  */
@@ -482,6 +483,9 @@
 	if (volume->snapshot_org == NULL) {
 		// either this is an original with an active snapshot, or a bad object
 		rc = 1;
+	} else if (pending_volume) {
+		// there is already a new snapshot volume waiting to be committed.
+		rc = 1;
 	} else {
 		get_snap_state(volume);
 		if (volume->meta_data.flags & EVMS_SNAPSHOT_ROLLBACK) {
@@ -559,6 +563,7 @@
 			}
 		}
 		EngFncs->rediscover_volume(original_object->volume, TRUE); // make the Engine delete and rediscover the original volume in the kernel
+		pending_volume = TRUE;
 	} else { // unset
 		// if we are the first and only snapshot in the list.
 		if (snapshot_volume->snapshot_org->snapshot_next == snapshot_volume &&
@@ -1084,6 +1089,8 @@
 
 		// turn off the dirty flag
 		object->flags &= ~SOFLAG_DIRTY;
+
+		pending_volume = FALSE;
 
 	} else { // rollback
 		int handle;