Distributed Network Block Device 3 --rewrite for Kernel 3.x https://git.openslx.org/dnbd3.git/atom/src/kernel/utils.c?h=isfant 2022-02-18T20:34:55+00:00 2022-02-18T20:34:55+00:00 Simon Rettberg 2022-02-12T22:56:35+00:00 urn:sha1:eb2876f6542af2bfa47c7a6905ecc4f81f1d2ad3 Using workqueues frees us from having to manage the lifecycle of three dedicated threads. Discovery (alt server checks) and sending keepalive packets is now done using work on the power efficient system queue. Sending and receiving happens via dedicated work queues with higher priority. blk-mq has also been around for quite a while in the kernel, so switching to it doesn't hurt backwards compatibility. As the code is now refactored to work more as blk-mq is designed, backwards compatibility even improved while at the same time freeing us from an arsenal of macros that were required to make the blk-mq port look and feel like the old implementation. For example, the code now compiles on CentOS 7 with kernel 3.10 without requiring special macros to detect the heavily modified RedHat kernel with all its backported features. A few other design limitations have been rectified along the way, e.g. switching to another server now doesn't internally disconnect from the current one first, which theoretically could lead to a non-working setup, if the new server isn't reachable and then - because of some transient network error - switching back also fails. As the discover-thread was torn down from the disconnect call, the connection would also not repair itself eventually. we now establish the new connection in parallel to the old one, and only if that succeeds do we replace the old one with it, similar to how the automatic alt-server switch already does it. 2021-04-16T06:20:06+00:00 Manuel Bentele 2021-04-16T06:20:06+00:00 urn:sha1:f7cca217a3696980a72564f57bad4597ddbe9df5 2021-03-12T13:52:47+00:00 Manuel Bentele 2021-03-12T13:52:47+00:00 urn:sha1:52a4ac3ede9b5bbc8015105d6fd5524c70e9bef5 2012-09-03T13:27:36+00:00 sr 2012-09-03T13:27:36+00:00 urn:sha1:a55be46ec7a281f5c3d41d48edf32e57ef5e4ba1 2012-02-08T20:26:47+00:00 Johann Latocha 2012-02-08T20:26:47+00:00 urn:sha1:f7e732e0ab494627666f3affe23622729bd637d7 [ALL] Send and receive servers [TODO] Config file reloading is broken 2012-01-30T21:15:44+00:00 Johann Latocha 2012-01-30T21:15:44+00:00 urn:sha1:1dc88febdcb2a1d09dfca592bb47106512526b29 2012-01-19T16:20:02+00:00 Johann Latocha 2012-01-19T16:20:02+00:00 urn:sha1:b7fd7219ce4fc73939c912d4a02f5b8e4301ede7