From: David Sterba <dsterba@suse.com>
Date: Tue, 8 Nov 2016 16:56:24 +0000 (+0100)
Subject: btrfs: use specialized page copying helpers in btrfs_clone_extent_buffer
X-Git-Tag: v4.14-rc1~1552^2~34^2~26
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=fba1acf9ff77656e3b9f5c0f7b6a52c93e4932ec;p=platform%2Fkernel%2Flinux-rpi3.git

btrfs: use specialized page copying helpers in btrfs_clone_extent_buffer

The copy_page is usually optimized and can be faster than memcpy.

Signed-off-by: David Sterba <dsterba@suse.com>
---

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 2ae731a..bf719e3 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -4720,9 +4720,9 @@ struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src)
 		WARN_ON(PageDirty(p));
 		SetPageUptodate(p);
 		new->pages[i] = p;
+		copy_page(page_address(p), page_address(src->pages[i]));
 	}
 
-	copy_extent_buffer(new, src, 0, 0, src->len);
 	set_bit(EXTENT_BUFFER_UPTODATE, &new->bflags);
 	set_bit(EXTENT_BUFFER_DUMMY, &new->bflags);