Btrfs: Fix PAGE_CACHE_SHIFT shifts on 32 bit machines

[linux-2.6-block.git] / fs / btrfs / disk-io.c

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 5a7e60d7f443044cb457ec637dadabdad96c36e9..8935eec31ee28df646942db10ee2463aef7a5533 100644 (file)
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -159,7 +159,7 @@ static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
 int csum_dirty_buffer(struct btrfs_root *root, struct page *page)
 {
        struct extent_map_tree *tree;
-       u64 start = page->index << PAGE_CACHE_SHIFT;
+       u64 start = (u64)page->index << PAGE_CACHE_SHIFT;
        u64 found_start;
        int found_level;
        unsigned long len;