Building from Source

Requirements

gcc and g++ 8 or newer, clang 10 or newer, or other compiler with C++11 plus designated initializers support from C++20
CMake
liburing, jerasure headers and libraries
ISA-L, libibverbs headers and libraries (optional)
tcmalloc (google-perftools-dev)

Download source, for example using git: git clone --recurse-submodules https://yourcmc.ru/git/vitalif/vitastor/

Get fio source and symlink it into <vitastor>/fio. If you don't want to build fio engine, you can disable it by passing -DWITH_FIO=no to cmake.

Build and install Vitastor:

cd vitastor
mkdir build
cd build
cmake .. && make -j8 install

It's recommended to build the QEMU driver (qemu_driver.c) in-tree, as a part of QEMU build process. To do that:

Install vitastor client library headers (from source or from vitastor-client-dev package)
Take a corresponding patch from patches/qemu-*-vitastor.patch and apply it to QEMU source
Copy src/qemu_driver.c to QEMU source directory as block/block-vitastor.c
Build QEMU as usual

But it is also possible to build it out-of-tree. To do that:

Get QEMU source, begin to build it, stop the build and copy headers:
- <qemu>/include → <vitastor>/qemu/include
- Debian:
  - Use qemu packages from the main repository
  - <qemu>/b/qemu/config-host.h → <vitastor>/qemu/b/qemu/config-host.h
  - <qemu>/b/qemu/qapi → <vitastor>/qemu/b/qemu/qapi
- CentOS 8:
  - Use qemu packages from the Advanced-Virtualization repository. To enable it, run yum install centos-release-advanced-virtualization.noarch and then yum install qemu
  - <qemu>/config-host.h → <vitastor>/qemu/b/qemu/config-host.h
  - For QEMU 3.0+: <qemu>/qapi → <vitastor>/qemu/b/qemu/qapi
  - For QEMU 2.0+: <qemu>/qapi-types.h → <vitastor>/qemu/b/qemu/qapi-types.h
- config-host.h and qapi are required because they contain generated headers
Configure Vitastor with WITH_QEMU=yes and, if you're on RHEL, also with QEMU_PLUGINDIR=qemu-kvm: cmake .. -DWITH_QEMU=yes.
After that, Vitastor will build block-vitastor.so during its build process.
This way you can use the driver even with unmodified QEMU, but you'll need to set environment variable LD_PRELOAD=/usr/lib/x86_64-linux-gnu/qemu/block-vitastor.so and Vitastor disks won't work in QAPI and in "new" JSON syntax -blockdev in this case.