Distributed Network Block Device 3 --rewrite for Kernel 3.x https://git.openslx.org/dnbd3.git/atom/src/kernel/sysfs.c?h=isfant 2025-04-15T15:31:20+00:00 2025-04-15T15:31:20+00:00 Simon Rettberg 2025-04-15T15:28:36+00:00 urn:sha1:49d8f67804af3117749623724bfb41384dec3729 2024-12-11T14:06:50+00:00 Simon Rettberg 2024-12-11T14:06:50+00:00 urn:sha1:02b42e07e79e607fea718cb94bc791967b6e17f8 2022-06-14T15:23:19+00:00 Simon Rettberg 2022-06-14T15:23:19+00:00 urn:sha1:a59e4a337a82e32612fbc7fdd2e93287b826abf2 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 2021-03-26T12:48:24+00:00 Simon Rettberg 2021-03-26T12:48:24+00:00 urn:sha1:052a248020ac82a2d090537e8986fcf2a37640e5 Remove superflous, reduntant or otherwise useless information. Use space as separator instead of comma for better readability and easier parsing in shell etc. 2021-03-24T15:07:15+00:00 Simon Rettberg 2021-03-24T15:07:15+00:00 urn:sha1:c73bc9413da8bc964d82e0a58525c7280cc1a456 Convert dnbd3_host_t to struct sockaddr immediately when adding alt servers, so we don't have to convert it every time we establish a connection. Additionally we can now use %pISpc in printf-like functions instead of having if/else constructs whenever we want to print an address. 2021-03-12T13:52:47+00:00 Manuel Bentele 2021-03-12T13:52:47+00:00 urn:sha1:52a4ac3ede9b5bbc8015105d6fd5524c70e9bef5 2020-08-28T12:50:51+00:00 Manuel Bentele 2020-08-28T12:50:51+00:00 urn:sha1:042b7ca9932f05ed7c69efc7b15fa58e42c6eb3c This change converts all debug messages to support the Linux kernel's dynamic debug feature. Debug messages can be enabled or disabled by the debug feature if the - kernel module is built in debug mode (EXTRA_CFLAGS=-g -DDEBUG) - Linux kernel supports dynamic debug (CONFIG_DYNAMIC_DEBUG is set) This patch removes outdated kernel compatibility macros (used for Linux kernels in version 4.x) and cleans up the kernel module's code. 2017-10-28T12:56:58+00:00 Simon Rettberg 2017-10-28T12:56:58+00:00 urn:sha1:c8c62246f84b5d9d4a496097f043696e2d9ba0bb AF_INET luckily was "2" on all platforms checked, so no problems there with interoperation, but AF_INET6 is different between Linux, BSD, Windows and possibly others, so map back and forth between AF_INET/AF_INET6 and HOST_IP4/HOST_IP6 to fix this.