Il 21/05/2013 17:25, Dietmar Maurer ha scritto: >> Hmm, right. But do we need the bitmap at all? We can just use >> > bdrv_is_allocated like bdrv_co_do_readv does. > If a write occur, we read and backup that cluster immediately (out of order). > So > I am quite sure we need the bitmap.
This is the same as how copy-on-read happens during image streaming, and it doesn't use a bitmap. Paolo
