Change snapshot status line to how full it is as a fraction.
[Alasdair Kergon]
--- diff/drivers/md/dm-exception-store.c	2003-04-17 17:43:53.000000000 +0100
+++ source/drivers/md/dm-exception-store.c	2003-04-17 17:54:12.000000000 +0100
@@ -427,11 +427,11 @@
 	return (struct pstore *) store->context;
 }
 
-static int persistent_percentfull(struct exception_store *store)
+static void persistent_fraction_full(struct exception_store *store,
+				     sector_t *numerator, sector_t *denominator)
 {
-	struct pstore *ps = get_info(store);
-	return (ps->next_free * store->snap->chunk_size * 100) /
-	    get_dev_size(store->snap->cow->dev);
+	*numerator = get_info(store)->next_free * store->snap->chunk_size - 1;
+	*denominator = get_dev_size(store->snap->cow->dev);
 }
 
 static void persistent_destroy(struct exception_store *store)
@@ -625,10 +625,10 @@
 	store->prepare_exception = persistent_prepare;
 	store->commit_exception = persistent_commit;
 	store->drop_snapshot = persistent_drop;
-	store->percent_full = persistent_percentfull;
+	store->fraction_full = persistent_fraction_full;
 	store->context = ps;
 
-	return r;
+	return 0;
 
       bad:
 	if (ps) {
@@ -678,10 +678,11 @@
 	callback(callback_context, 1);
 }
 
-static int transient_percentfull(struct exception_store *store)
+static void transient_fraction_full(struct exception_store *store,
+				    sector_t *numerator, sector_t *denominator)
 {
-	struct transient_c *tc = (struct transient_c *) store->context;
-	return (tc->next_free * 100) / get_dev_size(store->snap->cow->dev);
+	*numerator = ((struct transient_c *) store->context)->next_free;
+	*denominator = get_dev_size(store->snap->cow->dev);
 }
 
 int dm_create_transient(struct exception_store *store,
@@ -693,7 +694,7 @@
 	store->destroy = transient_destroy;
 	store->prepare_exception = transient_prepare;
 	store->commit_exception = transient_commit;
-	store->percent_full = transient_percentfull;
+	store->fraction_full = transient_fraction_full;
 	store->snap = s;
 
 	tc = kmalloc(sizeof(struct transient_c), GFP_KERNEL);
--- diff/drivers/md/dm-snapshot.c	2003-04-17 17:43:53.000000000 +0100
+++ source/drivers/md/dm-snapshot.c	2003-04-17 17:54:12.000000000 +0100
@@ -650,8 +650,13 @@
 		DMDEBUG("Exception completed successfully.");
 
 		/* Notify any interested parties */
-		if (s->store.percent_full) {
-			int pc = s->store.percent_full(&s->store);
+		if (s->store.fraction_full) {
+			int pc;
+			sector_t numerator, denominator;
+
+			s->store.fraction_full(&s->store, &numerator,
+					       &denominator);
+			pc = numerator * 100 / denominator;
 
 			if (pc >= s->last_percent + WAKE_UP_PERCENT) {
 				dm_table_event(s->table);
@@ -947,12 +952,18 @@
 		if (!snap->valid)
 			snprintf(result, maxlen, "Invalid");
 		else {
-			if (snap->store.percent_full)
-				snprintf(result, maxlen, "%d%%",
-					 snap->store.percent_full(&snap->
-								  store));
-			else
+			if (!snap->store.fraction_full)
 				snprintf(result, maxlen, "Unknown");
+
+			else {
+				sector_t numerator, denominator;
+				snap->store.fraction_full(&snap->store,
+							  &numerator,
+							  &denominator);
+				snprintf(result, maxlen,
+					 SECTOR_FORMAT "/" SECTOR_FORMAT,
+					 numerator, denominator);
+			}
 		}
 		break;
 
--- diff/drivers/md/dm-snapshot.h	2003-04-17 17:52:15.000000000 +0100
+++ source/drivers/md/dm-snapshot.h	2003-04-17 17:54:12.000000000 +0100
@@ -66,9 +66,11 @@
 	void (*drop_snapshot) (struct exception_store *store);
 
 	/*
-	 * Return the %age full of the snapshot
+	 * Return how full the snapshot is.
 	 */
-	int (*percent_full) (struct exception_store *store);
+	void (*fraction_full) (struct exception_store *store,
+			       sector_t *numerator,
+			       sector_t *denominator);
 
 	struct dm_snapshot *snap;
 	void *context;