CONFIG_JBD (not configurable)

modulename: jbd.ko

configname: CONFIG_JBD

Linux Kernel Configuration
└─>File systems
└─>JBD
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
This is a generic journalling layer for block devices. It is
currently used by the ext3 file system, but it could also be
used to add journal support to other file systems or block
devices such as RAID or LVM.

If you are using the ext3 file system, you need to say Y here.
If you are not using ext3 then you will probably want to say N.

To compile this device as a module, choose M here: the module will be
called jbd. If you are compiling ext3 into the kernel, you
cannot compile this code as a module.

source code:
depends
CONFIG_BLOCK

is depended by
CONFIG_EXT3_FS