linux/fs/jbd2/Kconfig
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   1config JBD2
   2        tristate
   3        select CRC32
   4        select CRYPTO
   5        select CRYPTO_CRC32C
   6        help
   7          This is a generic journaling layer for block devices that support
   8          both 32-bit and 64-bit block numbers.  It is currently used by
   9          the ext4 and OCFS2 filesystems, but it could also be used to add
  10          journal support to other file systems or block devices such
  11          as RAID or LVM.
  12
  13          If you are using ext4 or OCFS2, you need to say Y here.
  14          If you are not using ext4 or OCFS2 then you will
  15          probably want to say N.
  16
  17          To compile this device as a module, choose M here. The module will be
  18          called jbd2.  If you are compiling ext4 or OCFS2 into the kernel,
  19          you cannot compile this code as a module.
  20
  21config JBD2_DEBUG
  22        bool "JBD2 (ext4) debugging support"
  23        depends on JBD2 && DEBUG_FS
  24        help
  25          If you are using the ext4 journaled file system (or
  26          potentially any other filesystem/device using JBD2), this option
  27          allows you to enable debugging output while the system is running,
  28          in order to help track down any problems you are having.
  29          By default, the debugging output will be turned off.
  30
  31          If you select Y here, then you will be able to turn on debugging
  32          with "echo N > /sys/kernel/debug/jbd2/jbd2-debug", where N is a
  33          number between 1 and 5. The higher the number, the more debugging
  34          output is generated.  To turn debugging off again, do
  35          "echo 0 > /sys/kernel/debug/jbd2/jbd2-debug".
  36
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