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Btrfs: Properly cast before shifting

Signed-off-by: Chris Mason <chris.mason@oracle.com>
Chris Mason 17 years ago
parent
d99cb30a11
commit
0740c82bc7
1 changed files with 1 additions and 1 deletions
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  1. 1 1
      fs/btrfs/file.c

+ 1 - 1
fs/btrfs/file.c
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@@ -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,