commit 0740c82bc7585a23e100c9a59d5e2abbf99459fb
author Chris Mason <chris.mason@oracle.com> Tue Feb 19 16:24:18 2008 -0500
committer Chris Mason <chris.mason@oracle.com> Thu Sep 25 11:04:00 2008 -0400
tree 66d27b4009e1d74623fed610c0cade55767e159d
parent d99cb30a11ea117ad0f58cda09aa43438ebbf81c

Btrfs: Properly cast before shifting

Signed-off-by: Chris Mason <chris.mason@oracle.com>

fs/btrfs/file.c

diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 51466dc..5fa4504 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -764,7 +764,7 @@
 	}
 	if (start_pos < inode->i_size) {
 		u64 last_pos;
-		last_pos = (index + num_pages) << PAGE_CACHE_SHIFT;
+		last_pos = ((u64)index + num_pages) << PAGE_CACHE_SHIFT;
 		lock_extent(&BTRFS_I(inode)->io_tree,
 			    start_pos, last_pos - 1, GFP_NOFS);
 		clear_extent_bits(&BTRFS_I(inode)->io_tree, start_pos,