Btrfs: Properly cast before shifting

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

Btrfs: Properly cast before shifting
Signed-off-by: Chris Mason <chris.mason@oracle.com>
0740c82b · Chris Mason · d99cb30a · 0740c82b
Commit 0740c82b authored Feb 19, 2008 by Chris Mason
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fs/btrfs/file.c fs/btrfs/file.c +1 -1

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--- 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,