summaryrefslogtreecommitdiffstats
path: root/src/kernel
Commit message (Collapse)AuthorAgeFilesLines
* [KERNEL] Fix several connect/disconnect race conditionsSimon Rettberg2020-11-193-188/+193
| | | | | | | | | | | | | | | | | | | Previously disconnect was protected against concurrent calls, but connect wasn't. It was easy to crash the kernel when calling connect and disconnect IOCTLs in a tight loop concurrently. A global lock was introduced to make sure only one caller can change the connection state at a time. dev->connection_lock needs to be aquired when calling dnbd3_net_connect or _disconnect. This atomic_t based locking mechanism should be turned into a mutex in a next step, relying on mutex_trylock for cases where we don't have the cmpxchg-schedule() loop. Along the way it was noticed that the send/receive timeouts don't apply to kernel_connect, which might have been the case in older 3.x kernel versions. A crude workaround using nonblocking connect has been introduced to emulate this, but a clean solution for this is welcomed. Also, devices are now properly closed on module unload.
* [KERNEL] add support for Linux kernel 4.19 on Ubuntu 18.04 (GCC 7.5)Manuel Bentele2020-11-161-8/+8
| | | | | | | This patch replaces the __VA_OPT__ varadic macro for the C preprocessor with a builtin GCC extension for optional varadic arguments. Based on this change, the dnbd3 Linux kernel module can be also built with GCC 7.5 on a fresh Ubuntu 18.04 with Linux kernel version 4.19.x.
* [CLIENT] display proper connected server if multiple servers specifiedManuel Bentele2020-11-101-2/+2
| | | | | | | With this change, the dnbd3-client is able to display the selected server (choosen by the Linux kernel module) after successful probing. Therefore, the ioctl call OPEN returns the selected server host as index of the specified dnbd3-server hosts after successful probing.
* [KERNEL] add manual switching of dnbd3-server to specified serverManuel Bentele2020-11-104-56/+159
| | | | | | This patch adds the feature to manually switch the dnbd3-server to a specified server. The switching is implemented by the use of the ioctl call SWITCH.
* [KERNEL] protect read-only access to server listManuel Bentele2020-11-091-6/+9
| | | | | | | | | | This patch completes the changes from the last commit [1] and protects in addition the read-only access to the alternative list of new servers. Otherwise a race condition between ioctl ADD_SRV/REM_SRV (process context) and dnbd3 discover thread would be possible since the 'new_servers_num' field is changed in both contexts. [1] - DNBD3 commit db5a93a43fea2aa3c3bbaf8c48d238e60d834676
* [KERNEL] protect access to server list if alt server is added/removedManuel Bentele2020-11-091-0/+3
| | | | | | This patch locks the protecting spinlock of the DNBD3 device's new server list. Otherwise a race condition between ioctl ADD_SRV/REM_SRV (process context) and dnbd3 discover thread would be possible.
* [KERNEL]: change probing logic to select first available serverManuel Bentele2020-11-092-16/+25
| | | | | | | This patch changes the probing logic to select the first available dnbd3-server submitted by the ioctl OPEN call. All other specified dnbd3-servers are added to the alternative server list and do not have to be available.
* [KERNEL, CLIENT]: submit and probe multiple dnbd3-server with ioctl OPENManuel Bentele2020-11-063-90/+209
| | | | | | | | | | The ioctl OPEN call for DNBD3 devices exposed by the dnbd3 Linux kernel module, is extended with a fixed array of dnbd3 hosts. The fixed array allows the dnbd3-client to submit host information (IP address and port) of multiple dnbd3-servers. This information is used to probe all submitted dnbd3-servers and add them to the alternative dnbd3-server list. If at least one dnbd3-server is not reachable, the OPEN ioctl call will abort with an error code.
* [BUILD] remove the build requirement for an unused C++ compilerManuel Bentele2020-10-271-1/+2
| | | | | This patch sets the programming languages of each CMake project to C. With this change, CMake does not search for an unused C++ compiler anymore.
* [BUILD] fix comments and remove useless code fragments in CMake filesManuel Bentele2020-10-231-6/+5Star
|
* [BUILD] add CMake targets to build binary and source packages with CPackManuel Bentele2020-10-222-3/+3
| | | | | | | | | | | This patch adds the following CMake targets - package - source to build bundeled packages. Those packages contain either all built binary artifacts or all source files for source code distribution. Both CMake targets are available in Release build configuration.
* [BUILD] set build type and stop Release build if repository is dirtyManuel Bentele2020-10-191-3/+3
|
* [BUILD] rewrite CMake build system to track changes of source filesManuel Bentele2020-10-1611-18/+68
| | | | | | | | | | This change restructures the source code directories, separates shared form non-shared application code and adds CMake dependencies. These dependencies allow the tracking of changes and trigger a rebuild of those build targets where changed files are involved. WARNING: Note that the support of the DNBD3_SERVER_AFL build option is not supported yet. Thus, the option should be never turned on.
* [KERNEL] ported socket time structures to support CentOS 8 kernel 4.18Manuel Bentele2020-10-131-1/+24
| | | | | | | | | This patch implements the old time structures to support Linux kernels prior to version 5.1.x. WARNING: This change to the deprecated time structures does not solve the Y2038 issue. Thus, the dnbd3 Linux kernel module can only run under Linux kernels prior to version 5.1.x until the end of year 2037.
* [KERNEL] set socket timeouts with new function and time structureManuel Bentele2020-08-311-8/+30
| | | | | | | | | | This patch replaces the deprecated kernel_setsockopt() function with the socket generic function sock_setsockopt() to set the send and receive timeout for all used sockets in the kernel module. The timeout data type is choosen according to the available kernel version, so that the dnbd3 kernel module supports the new y2038-problem-solving socket options. With both changes, the kernel module runs on Linux kernel 5.4 LTS and later (including Linux kernel 5.9).
* [KERNEL] make private network functions staticManuel Bentele2020-08-282-294/+286Star
|
* [KERNEL] convert debug messages and clean up codeManuel Bentele2020-08-287-203/+254
| | | | | | | | | | | | 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.
* [KERNEL] convert to blk-mq and ktimeManuel Bentele2020-08-274-144/+177
| | | | | | | | | | | This converts the dnbd3 kernel module driver to use the blk-mq infrastructure, which allows the dnbd3 kernel module driver to be compatible with Linux kernels in version 5.x or later. The conversion of the implementation uses one hardware queue to preserve the existing send/receive and load-balancing logic, but can be scaled up in the future. In addition to that, time measurements in the implementation are converted to ktime based accessors to replace the use of deprecated time interfaces.
* [KERNEL] Lower queue->limits.max_sectors to 256, like nbdSimon Rettberg2019-02-131-1/+1
|
* [KERNEL] Fix keep alive timer on 4.15+Simon Rettberg2018-08-151-1/+1
|
* [KERNEL] Add support for kernel 4.17.xSimon Rettberg2018-07-061-0/+11
|
* [KERNEL] Pre/post 4.11 handling of request opsJonathan Bauer2018-04-052-11/+30
|
* [KERNEL] #ifs and #defines for timer pre/post 4.15Simon Rettberg2018-04-052-13/+18
|
* [KERNEL] Macros for packing CMD_* into struct requestSimon Rettberg2018-03-271-4/+21
| | | | Version check for pre or post 4.11
* Follow https://lwn.net/Articles/735887/Rafael Gieschke2018-03-242-4/+16
|
* Include `linux/signal.h` for `siginitsetinv`, `sigmask`, `sigprocmask`Rafael Gieschke2018-03-241-0/+1
|
* Follow ↵Rafael Gieschke2018-03-232-11/+11
| | | | https://github.com/torvalds/linux/commit/aebf526b53aea164508730427597d45f3e06b376
* [*] Introduce constants for IPv4/6 in dnbd3_host_tSimon Rettberg2017-10-282-16/+16
| | | | | | | 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.
* [KERNEL] version check to support pointer to backing_dev_info in request_queueSimon Rettberg2017-10-091-0/+6
| | | | | This changed in 4.11, see https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=dc3b17cc8bf21307c7e076e7c778d5db756f7871
* [*] Continue splitting #defines to clientconfig.h etc.Simon Rettberg2017-09-023-0/+3
|
* [KERNEL] PAGE_CACHE_SIZE -> PAGE_SIZESimon Rettberg2016-10-171-1/+1
| | | | | | | These two have been the same all along and recently, the _CACHE variant has been removed (kernel 4.6). Switch to the non-CACHE version so build doesn't break on newer kernels.
* [KERNEL/CLIENT] Several minor tweaks and changesSimon Rettberg2016-01-113-13/+13
| | | | | | | | | | - Disable panic timeout that reports errors to block layer by default - Get rid of "is_server" used by old proxy mode, introduce "honor_server_alts" that just controls whether we use alts provided by the server - Allow switching servers when we only have 3 RTT measurements - If using alts provided by server, don't ignore those that come from other servers than the initial one
* [KERNEL] Add support for kernel 4.2.xSimon Rettberg2015-10-132-2/+12
|
* Get rid of unneccessary volatileSimon Rettberg2015-02-221-2/+2
| | | | Some minor debugging code, mostly commented out
* [SERVER] Crank up warning levels of gcc and fix them all (mostly sign ↵Simon Rettberg2015-01-141-1/+4
| | | | | | | compare and some unused params) Also allow newline at end of alt-servers file without complaining about it not being a valid alt server definition.
* [KERNEL] Support for kernel 3.14Simon Rettberg2014-07-041-1/+6
|
* [KERNEL] Improved read timeout handlingSimon Rettberg2013-12-201-4/+7
|
* [KERNEL] Don't pick a random block for RTT measurementSimon Rettberg2013-11-171-17/+3Star
| | | | It's a bad idea.
* tiny fixSimon Rettberg2013-11-111-1/+1
|
* [KERNEL] Fix possible deadlock on server switchSimon Rettberg2013-11-112-80/+75Star
| | | | | [KERNEL] Remove server mode support as it's not needed anymore [KERNEL] Some more sanity checks and debug messages
* [SERVER] Minor tweaks here and thereSimon Rettberg2013-11-101-12/+1Star
|
* [KERNEL] Tweak better server selection a bit by also adding a constant delay ↵Simon Rettberg2013-10-241-1/+1
| | | | (1,5ms)
* [KERNEL] Slow down with RTT measurements after 30 secondsSimon Rettberg2013-10-242-6/+22
| | | | | | | Right after connecting, all servers will be polled every 4 seconds for 30 seconds, so we get 7 data points per alt-server. If no better server is found during this time, further RTT measurements will be done every 22 seconds, to put less load on the network in the long run.
* [KERNEL] Detect stale state and change serverSimon Rettberg2013-10-241-3/+24
|
* [KERNEL] Check for invalid ioctls to prevent kernel panics :)Simon Rettberg2013-08-191-12/+21
|
* [KERNEL] Throw a coin here and there when it comes to switching to a faster ↵Simon Rettberg2013-08-131-89/+94
| | | | server
* [SERVER] Uplink handing complete (untested, as alt servers can't be defined ↵Simon Rettberg2013-07-311-0/+1
| | | | yet, so prepare for lots of fixes ;))
* fix deadlocksr2013-07-182-8/+21
|
* kernel module changessr2013-07-182-12/+28
|
* Replace all pthread_spin_* calls with spin_*, so that all locking can be ↵sr2013-07-172-0/+2
| | | | | | tracked and debugged Fix compilation of kernel module
generated by cgit v1.2.3-55-g7522 (git 2.39.0) at 2024-06-03 21:44:55 +0200