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Compiling and Installing Bcache

CentOS 7.6

  1. Obtain the bcache source code and save it to /home.
  2. Decompress the source package.
    1
2
    cd /home
unzip bcache-smart-write-cache.zip
  3. Compile the source code to obtain the bcache driver module.
    1
2
    cd /home/bcache-smart-write-cache/drivers/md/bcache
make -C /lib/modules/$(uname -r)/build M=$(pwd)

    During compilation, select the build directory of the kernel where bcache.ko needs to be run based on your environment.

  4. Check the reference count of the bcache module. If no information is displayed, skip step 5.
    lsmod | grep -w bcache

    Ensure that the reference count is 0.

    bcache                458752  0
  5. Check that bcache.ko is not loaded in the current environment.
    modprobe -r bcache
  6. (Optional) Delete the installation directory. Skip this step if bcache is not installed.
    rm -rf /lib/modules/$(uname -r)/kernel/drivers/md/bcache
  7. Create an installation directory.
    mkdir -p /lib/modules/$(uname -r)/kernel/drivers/md/bcache
  8. Copy bcache.ko to the installation directory.
    cp bcache.ko /lib/modules/$(uname -r)/kernel/drivers/md/bcache
  9. Compress bcache.ko.
    xz -z /lib/modules/$(uname -r)/kernel/drivers/md/bcache/bcache.ko
  10. Update the module dependency of bcache.ko.
    depmod -a
  11. Update initramfs.
    dracut --add-drivers bcache -f /boot/initramfs-$(uname -r).img
  12. Check whether bcache.ko is successfully installed.
    • Command 1: Query bcache.ko in the initramfs file.
      lsinitrd /boot/initramfs-$(uname -r).img | grep bcache.ko.xz

      The command output is as follows:

      -rw-r--r-- 1 root root 997136 Nov 30 11:45 usr/lib/modules/4.14.0-115.el7a.0.1.aarch64/kernel/drivers/md/bcache/bcache.ko.xz
    • Command 2: Query detailed information about the bcache module in the current system.
      ls -l /lib/modules/$(uname -r)/kernel/drivers/md/bcache/bcache.ko.xz

      The command output is as follows:

      -rw-r--r-- 1 root root 997136 Nov 30 11:45 /lib/modules/4.14.0-115.el7a.0.1.aarch64/kernel/drivers/md/bcache/bcache.ko.xz

      If the content of the file in usr/lib/modules/ in the command output of command 1 is the same as that in /lib/modules/ in the command output of command 2, the bcache.ko file in the current system is successfully updated to the initramfs file.

  13. Load bcache.ko.
    modprobe bcache

openEuler 20.03

  1. Obtain the bcache source code and save it to /home.
  2. Decompress the source package.
    cd /home
unzip kernel-openEuler-1.0-LTS.zip
  3. Replace the system header file temporarily.
    mv /usr/src/kernels/$(uname -r)/include/trace/events/bcache.h /usr/src/kernels/$(uname -r)/include/trace/events/bcache.h.bak
cp /home/kernel-openEuler-1.0-LTS/include/trace/events/bcache.h /usr/src/kernels/$(uname -r)/include/trace/events/bcache.h

    The /home/kernel-openEuler-1.0-LTS folder is obtained by decompressing the bcache source code.

  4. Compile the source code to obtain the bcache driver module.
    1
2
    cd /home/kernel-openEuler-1.0-LTS/drivers/md/bcache
make -C /lib/modules/$(uname -r)/build M=$(pwd)

    During compilation, select the build directory of the kernel where bcache.ko needs to be run based on your environment.

  5. Replace it with the original file.
    \mv /usr/src/kernels/$(uname -r)/include/trace/events/bcache.h.bak /usr/src/kernels/$(uname -r)/include/trace/events/bcache.h
  6. Check the reference count of the bcache module. If no information is displayed or the reference count is 0, skip step 7.
    lsmod | grep -w bcache

    Ensure that the reference count is 0.

    bcache                458752  0
  7. Check that bcache.ko is not loaded in the current environment.
    modprobe -r bcache
  8. Delete the installation directory.
    rm -rf /lib/modules/$(uname -r)/kernel/drivers/md/bcache
  9. Create an installation directory.
    mkdir -p /lib/modules/$(uname -r)/kernel/drivers/md/bcache
  10. Copy bcache.ko to the installation directory.
    cp bcache.ko /lib/modules/$(uname -r)/kernel/drivers/md/bcache
  11. Compress bcache.ko.
    xz -z /lib/modules/$(uname -r)/kernel/drivers/md/bcache/bcache.ko
  12. Update the module dependency of bcache.ko.
    depmod -a
  13. Update initramfs.
    dracut --add-drivers bcache -f /boot/initramfs-$(uname -r).img
  14. Check whether bcache.ko is successfully installed.

    If the following two commands output the same file information, the installation is successful.

    • Command 1: Query bcache.ko in the initramfs file.
      lsinitrd /boot/initramfs-$(uname -r).img | grep bcache.ko.xz

      The command output is as follows:

      -rw-r--r-- 1 root root 997136 Nov 30 11:45 usr/lib/modules/4.14.0-115.el7a.0.1.aarch64/kernel/drivers/md/bcache/bcache.ko.xz
    • Command 2: Query detailed information about the bcache module in the current system.
      ls -l /lib/modules/$(uname -r)/kernel/drivers/md/bcache/bcache.ko.xz

      The command output is as follows:

      -rw-r--r-- 1 root root 997136 Nov 30 11:45 /lib/modules/4.14.0-115.el7a.0.1.aarch64/kernel/drivers/md/bcache/bcache.ko.xz
  15. Load bcache.ko.
    modprobe bcache
Parent topic: Installing the Bcache