Commit 92d83e94 authored by Qu Wenruo's avatar Qu Wenruo Committed by David Sterba
Browse files

btrfs: support subpage in btrfs_clone_extent_buffer 



For btrfs_clone_extent_buffer(), it's mostly the same code of
__alloc_dummy_extent_buffer(), except it has extra page copy.

So to make it subpage compatible, we only need to:

- Call set_extent_buffer_uptodate() instead of SetPageUptodate()
  This will set correct uptodate bit for subpage and regular sector size
  cases.

Since we're calling set_extent_buffer_uptodate() which will also set
EXTENT_BUFFER_UPTODATE bit, we don't need to manually set that bit
either.

Reviewed-by: default avatarJosef Bacik <josef@toxicpanda.com>
Signed-off-by: default avatarQu Wenruo <wqu@suse.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 251f2acc

fs/btrfs/extent_io.c

+1 −2
Original line number Diff line number Diff line
@@ -5163,11 +5163,10 @@ struct extent_buffer *btrfs_clone_extent_buffer(const struct extent_buffer *src) 
			return NULL;

		}

		WARN_ON(PageDirty(p));

		SetPageUptodate(p);

		new->pages[i] = p;

		copy_page(page_address(p), page_address(src->pages[i]));

	}

	set_bit(EXTENT_BUFFER_UPTODATE, &new->bflags);

	set_extent_buffer_uptodate(new);



	return new;

}