Prepare for rereading exceptions. Make "dm_insert_exceptions" and
"read_exceptions" continue where they last stopped. In the beginning,
this is zero, so the patch doesn't change any functionality.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>

---
 drivers/md/dm-snap-persistent.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

Index: linux-2.6.31-fast-new-2/drivers/md/dm-snap-persistent.c
===================================================================
--- linux-2.6.31-fast-new-2.orig/drivers/md/dm-snap-persistent.c	2009-10-16 21:51:41.000000000 +0200
+++ linux-2.6.31-fast-new-2/drivers/md/dm-snap-persistent.c	2009-10-16 21:53:04.000000000 +0200
@@ -437,7 +437,7 @@ static int insert_exceptions(struct psto
 	/* presume the area is full */
 	*full = 1;
 
-	for (i = 0; i < ps->exceptions_per_area; i++) {
+	for (i = ps->current_committed; i < ps->exceptions_per_area; i++) {
 		read_exception(ps, i, &de);
 
 		/*
@@ -465,6 +465,7 @@ static int insert_exceptions(struct psto
 		if (r)
 			return r;
 	}
+	ps->current_committed = 0;
 
 	return 0;
 }
@@ -480,7 +481,7 @@ static int read_exceptions(struct pstore
 	 * Keeping reading chunks and inserting exceptions until
 	 * we find a partially full area.
 	 */
-	for (ps->current_area = 0; full; ps->current_area++) {
+	for (; full; ps->current_area++) {
 		r = area_io(ps, READ);
 		if (r)
 			return r;