ocfs2: Fix heartbeat sector calculation

This fixes things for devices which set max_sectors to 8.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>

1 files changed, 6 insertions, 2 deletions

diff --git a/fs/ocfs2/cluster/heartbeat.c b/fs/ocfs2/cluster/heartbeat.c
index 504595d6cf65..305cba3681fe 100644
--- a/fs/ocfs2/cluster/heartbeat.c
+++ b/fs/ocfs2/cluster/heartbeat.c
@@ -320,8 +320,12 @@ static int compute_max_sectors(struct block_device *bdev)
                 max_pages = q->max_hw_segments;
         max_pages--; /* Handle I/Os that straddle a page */
 
-        max_sectors = max_pages << (PAGE_SHIFT - 9);
-
+        if (max_pages) {
+                max_sectors = max_pages << (PAGE_SHIFT - 9);
+        } else {
+                /* If BIO contains 1 or less than 1 page. */
+                max_sectors = q->max_sectors;
+        }
         /* Why is fls() 1-based???? */
         pow_two_sectors = 1 << (fls(max_sectors) - 1);