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