btrfs: copy all pages at once at the end of btrfs_clone_extent_buffer()

btrfs_clone_extent_buffer() calls copy_page() at each iteration but we
can copy all pages at the end in one go if there were no errors.
This would make later conversion to folios easier.

Reviewed-by: Sweet Tea Dorminy <sweettea-kernel@dorminy.me>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 1ba8857..3e30333 100644 (file)
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -3239,8 +3239,8 @@ struct extent_buffer *btrfs_clone_extent_buffer(const struct extent_buffer *src)
                        return NULL;
                }
                WARN_ON(PageDirty(p));
-               copy_page(page_address(p), page_address(src->pages[i]));
        }
+       copy_extent_buffer_full(new, src);
        set_extent_buffer_uptodate(new);
 
        return new;