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* [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 Bentele2020-11-162-8/+22
| | | | | | | 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.
* cmake: Add default include dir for fuseSimon Rettberg2020-11-131-1/+1
| | | | | | | Without this, the FindFuse module will silently set the wrong include path for fuse if we don't have pkg-config installed, leading to compile errors. We could either make pkg-config a requirement, or try to fall back to its default path.
* cmake: No sign conversion warningsSimon Rettberg2020-11-131-1/+1
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* [SERVER] Fix log calls in thread debug codeSimon Rettberg2020-11-131-5/+7
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* cmake: Fix passing -Defines to ccSimon Rettberg2020-11-131-3/+3
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* [BUILD] add support to locate build directory out of Git directoryManuel Bentele2020-11-133-7/+11
| | | | | This patch adds support to locate the build directory for generated artifacts out of the original checked out Git source code repository.
* [BUILD] add CMake toolchain files to cross-compile for ppc and aarch64Manuel Bentele2020-11-113-0/+68
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* [BUILD] build docker containers only if build of dnbd3-server is enabledManuel Bentele2020-11-102-4/+5
| | | | | | | | | This patch fixes the issue that a Docker container for the dnbd3 components (including the dnbd3-server) can be built with missing dnbd3-server's binary. Since the created Docker container starts the missing binary, it will fail. Therefore, a built of the Docker image is only possible if building of the dnbd3-server is enabled (CMAKE option DNBD3_SERVER=ON).
* [CLIENT] display proper connected server if multiple servers specifiedManuel Bentele2020-11-102-14/+20
| | | | | | | 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 Bentele2020-11-065-105/+268
| | | | | | | | | | 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] add CMake support to build docker images based on ArchlinuxManuel Bentele2020-11-024-9/+46
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* [CLIENT] format output of program help textManuel Bentele2020-10-301-7/+7
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* [CLIENT] add documentation for adding/removing dnbd3-server to helpManuel Bentele2020-10-302-10/+9Star
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* [BUILD] do not ignore C flags that are passed to CMakeManuel Bentele2020-10-301-1/+1
| | | | | | | | C flags which are set by the environment variable CFLAGS have been ignored by CMake since the corresponding CMake variable CMAKE_C_FLAGS was not extended with those passed flags, but have been overwritten by a fixed set of flags. This patch fixes the overwrite of CMAKE_C_FLAGS and extends its content with the C flags passed in the environment variable.
* [FUSE] removed unnecessary cmdln argument check for sticky modeManuel Bentele2020-10-301-6/+0Star
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* [BUILD] add build options to enable/disable build of dnbd3 componentsManuel Bentele2020-10-305-7/+22
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* [CLIENT] add feature to ignore propagated alternative servers (sticky mode)Manuel Bentele2020-10-292-6/+29
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* [DOC] update setup description of docker containers with network linksManuel Bentele2020-10-291-7/+16
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* [BUILD] add CMake support to build docker images based on Ubuntu 20.04Manuel Bentele2020-10-295-1/+113
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* [SERVER] Update nextSave timestamp at start of functionSimon Rettberg2020-10-291-4/+6
| | | | | | | | | saveLoadAllCacheMaps() is called frequently, and a 'full' run can take some time. If we only update the nextSave timestamp when we're done, we might already have a concurrent call to the function, which will also do a 'full' run, since the timestamp is not updated yet. This doesn't break anything, but leads to even more disk activity, which is probably already high, given that the previous run is not done yet.
* [BUILD] do not print verbose CMake messages in unsupported CMake versionsv2.3Manuel Bentele2020-10-272-16/+7Star
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* [BUILD] fix broken version header packaging for source packagesManuel Bentele2020-10-273-11/+44
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* [BUILD] remove the build requirement for an unused C++ compilerManuel Bentele2020-10-2711-12/+20
| | | | | 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.
* Add CMake build requirements check to find libraries and Linux kernel headersManuel Bentele2020-10-274-24/+56
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* [DOC] Fix URL to the Linux kernel documentation in READMEManuel Bentele2020-10-261-1/+1
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* [DOC] updated README with general information and build instructionsManuel Bentele2020-10-231-2/+172
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* [BUILD] fix comments and remove useless code fragments in CMake filesManuel Bentele2020-10-232-8/+7Star
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* [BUILD] disable build of dnbd3-client if Linux kernel module is disabledManuel Bentele2020-10-221-2/+2
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* [BUILD] add systemd service file for dnbd3-server to installation targetsManuel Bentele2020-10-228-6/+42
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* [BUILD] add CMake targets to build binary and source packages with CPackManuel Bentele2020-10-2227-219/+405
| | | | | | | | | | | 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] add option to build the dnbd3-server with afl-fuzz supportManuel Bentele2020-10-208-21/+106
| | | | | The afl-fuzz support for the dnbd3-server requires an AFL C compiler like afl-gcc and can be enabled with the CMake option DNBD3_SERVER_AFL.
* [BUILD] do not stop Release build if repository is dirty but warnManuel Bentele2020-10-201-4/+9
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* [BUILD] set build type and stop Release build if repository is dirtyManuel Bentele2020-10-1911-24/+37
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* [BUILD] build Linux kernel module only on Linux systemsManuel Bentele2020-10-191-18/+20
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* [BUILD] fixes issues to build user space programs on FreeBSD 12.1Manuel Bentele2020-10-199-22/+17Star
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* [BUILD] rewrite CMake build system to track changes of source filesManuel Bentele2020-10-1675-494/+542
| | | | | | | | | | 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.
* [FUSE] turn on compiler optimization to fix warningManuel Bentele2020-10-131-3/+3
| | | | | | | This change enables compiler optimization (-O2) in Release builds to fix the following error warning: _FORTIFY_SOURCE requires compiling with optimization (-O)
* [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.
* Remove .vscodeSimon Rettberg2020-09-221-19/+0Star
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* [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
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* [KERNEL] convert debug messages and clean up codeManuel Bentele2020-08-288-205/+256
| | | | | | | | | | | | 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 Bentele2020-08-275-144/+183
| | | | | | | | | | | 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.
* cmake: Fixed missing include paths to build the Linux kernel moduleManuel Bentele2020-08-191-1/+1
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* cmake: Fixed wrong package name in the Fuse find moduleManuel Bentele2020-08-191-2/+2
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