commit 7606f85a701ed8feeac065e133ff9a51c267aa0d
author srimugunthan dhandapani <srimugunthan.dhandapani@gmail.com> Fri Aug 26 16:08:39 2011 +0530
committer Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Fri Aug 26 16:08:39 2011 +0530
tree 6c6d307b349c0897a6f76c4d16e8ae50adc7897b
parent d37854cf99319966f34bb19c7a897b87d478b56c

UBIFS: fix the dark space calculation

The dark space calculation should be 64 bit type-casted, when
assigning to tmp64 (similar to how total_free is calculated).
Overflow will occur for very large flashes.

Signed-off-by: srimugunthan <srimugunthan.dhandapani@gmail.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@intel.com>

fs/ubifs/sb.c

diff --git a/fs/ubifs/sb.c b/fs/ubifs/sb.c
index 93d938a..6094c5a 100644
--- a/fs/ubifs/sb.c
+++ b/fs/ubifs/sb.c
@@ -247,7 +247,7 @@
 	mst->total_dirty = cpu_to_le64(tmp64);
 
 	/*  The indexing LEB does not contribute to dark space */
-	tmp64 = (c->main_lebs - 1) * c->dark_wm;
+	tmp64 = ((long long)(c->main_lebs - 1) * c->dark_wm);
 	mst->total_dark = cpu_to_le64(tmp64);
 
 	mst->total_used = cpu_to_le64(UBIFS_INO_NODE_SZ);