From: Chris Mason <chris.mason@oracle.com>
Date: Tue, 19 Feb 2008 21:24:18 +0000 (-0500)
Subject: Btrfs: Properly cast before shifting
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=0740c82bc7585a23e100c9a59d5e2abbf99459fb;p=linux-beck.git

Btrfs: Properly cast before shifting

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

diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 51466dcd44e0..5fa450452f9b 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -764,7 +764,7 @@ static int prepare_pages(struct btrfs_root *root, struct file *file,
 	}
 	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,