On Thu, May 21, 2015 at 6:11 AM, Li Wang <liwang@xxxxxxxxxxxxxxx> wrote: > This is a new feature of rbd layering, when reading an object > from child, if not exist, the kernel rbd client will not only > request parent for the object, but also write it to child, > and the jobs are done in an asynchronous way. Therefore, the > subsequent accesses on this object will hit child without > bothering parent. This feature could avoid longer latency incurred > during accessing parent, especially when child and parent are > geographically isolated, and it also could potentially avoid > overloading parent. > > The patches: > https://github.com/ceph/ceph-client/pull/11 > > Min Chen (4): > Rbd: add an option for copy-on-read > Rbd: add a new request: rbd_copyup_request > Rbd: helper functions to manipulate rbd_copyup_request > Rbd: implement the copy-on-read logic > > drivers/block/rbd.c | 385 +++++++++++++++++++++++++++++++++++++++++++++++++++- > 1 file changed, 382 insertions(+), 3 deletions(-) Kernel client patches should be posted to ceph-devel. While I can certainly do my review on github, others won't. Please post those patches as a reply to your cover letter. Thanks, Ilya -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
