On Sat, Jul 18, 2009 at 11:42 AM, David Woodhouse<dwmw2@xxxxxxxxxxxxx> wrote: > On Sat, 18 Jul 2009, Dan Williams wrote: >> I was under the impression that btrfs wanted to leverage md's stripe >> handling logic as well, seems that is not the case? > > No. We do a bunch of the stuff you mention above, but entirely within the > file system so we don't have to invent a bunch of layering violations just > to work around a broken design. Sure, a layering violation for an existing filesystem. For btrfs, at LSF'09, we briefly talked about breaking out more than just the erasure codes from software-raid into a "libraid". At some point in the i/o path a btrfs stripe operation becomes indistinguishable from a raid5,6 operation so at first glance there appears to be room to share common infrastructure like portions of handle_stripe for example. -- Dan -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
