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This feature allows the userspace tool xlosetup to completely setup a
loop device with a single ioctl call, removing the in-between state
where the device can be partially configured, eg. the loop device has
a backing file associated with it, but is reading from the wrong offset.
Besides removing the intermediate state, another big benefit of this
ioctl is that XLOOP_SET_STATUS can be slow. The main reason for this
slowness is that XLOOP_SET_STATUS(64) calls blk_mq_freeze_queue() to
freeze the associated queue. This requires waiting for RCU.
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This change replaces all 64-bit division and modulo operations with
specific Linux kernel macros and functions to support 32-bit hardware
architectures. Thus, the xloop kernel modules can also run on 32-bit
ARM architectures, such as the Raspberry Pi 1 running Raspberry Pi OS.
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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.
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This patch removes the static generation of the LTP configuration header done by
CMake. The static generation is replaced with a fixed header (no CMake template
anymore) which includes the dynamic generated xloop version header to define
version number macros for LTP.
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This change replaces the static version and build type header file generation
by CMake with dynamic CMake targets to generate the version file whenever a Make
target is executed. Thus, there is no need anymore to reconfigure and rerun
CMake after the repository version or build configuration has changed.
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