tree 1c696b201c9eaea365e8d80bb3956827a0a880e7
parent 9d77a5fee9d2a1ea4cd9a841d27b107df5913b33
author Philipp Reisner <philipp.reisner@linbit.com> 1289307581 +0100
committer Philipp Reisner <philipp.reisner@linbit.com> 1299753296 +0100

drbd: Implemented side-stepping in drbd_res_begin_io()

Before:
  drbd_rs_begin_io() locked app-IO out of an RS extent, and
  waited then until all previous app-IO in that area finished.
  (But not only until the disk-IO was finished but until the
   barrier/epoch ack came in for that == round trip time latency ++)

After:
  As soon as a new app-IO waits wants to start new IO on that
  RS extent, drbd_rs_begin_io() steps aside (clearing the
  BME_NO_WRITES flag again). It retries after 100ms.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>