Btrfs: Fix delayed allocation to avoid missing delalloc extents

[safe/jmp/linux-2.6] / fs / btrfs / inode.c

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 1e725a4..55b2e14 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -798,6 +798,7 @@ static int btrfs_cow_one_page(struct inode *inode, struct page *page,
        u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
        u64 page_end = page_start + PAGE_CACHE_SIZE - 1;
 
+       WARN_ON(!PageLocked(page));
        set_page_extent_mapped(page);
 
        lock_extent(em_tree, page_start, page_end, GFP_NOFS);