1*6da0b38fSAlexey Dobriyanconfig JBD2 2*6da0b38fSAlexey Dobriyan tristate 3*6da0b38fSAlexey Dobriyan select CRC32 4*6da0b38fSAlexey Dobriyan help 5*6da0b38fSAlexey Dobriyan This is a generic journaling layer for block devices that support 6*6da0b38fSAlexey Dobriyan both 32-bit and 64-bit block numbers. It is currently used by 7*6da0b38fSAlexey Dobriyan the ext4 and OCFS2 filesystems, but it could also be used to add 8*6da0b38fSAlexey Dobriyan journal support to other file systems or block devices such 9*6da0b38fSAlexey Dobriyan as RAID or LVM. 10*6da0b38fSAlexey Dobriyan 11*6da0b38fSAlexey Dobriyan If you are using ext4 or OCFS2, you need to say Y here. 12*6da0b38fSAlexey Dobriyan If you are not using ext4 or OCFS2 then you will 13*6da0b38fSAlexey Dobriyan probably want to say N. 14*6da0b38fSAlexey Dobriyan 15*6da0b38fSAlexey Dobriyan To compile this device as a module, choose M here. The module will be 16*6da0b38fSAlexey Dobriyan called jbd2. If you are compiling ext4 or OCFS2 into the kernel, 17*6da0b38fSAlexey Dobriyan you cannot compile this code as a module. 18*6da0b38fSAlexey Dobriyan 19*6da0b38fSAlexey Dobriyanconfig JBD2_DEBUG 20*6da0b38fSAlexey Dobriyan bool "JBD2 (ext4) debugging support" 21*6da0b38fSAlexey Dobriyan depends on JBD2 && DEBUG_FS 22*6da0b38fSAlexey Dobriyan help 23*6da0b38fSAlexey Dobriyan If you are using the ext4 journaled file system (or 24*6da0b38fSAlexey Dobriyan potentially any other filesystem/device using JBD2), this option 25*6da0b38fSAlexey Dobriyan allows you to enable debugging output while the system is running, 26*6da0b38fSAlexey Dobriyan in order to help track down any problems you are having. 27*6da0b38fSAlexey Dobriyan By default, the debugging output will be turned off. 28*6da0b38fSAlexey Dobriyan 29*6da0b38fSAlexey Dobriyan If you select Y here, then you will be able to turn on debugging 30*6da0b38fSAlexey Dobriyan with "echo N > /sys/kernel/debug/jbd2/jbd2-debug", where N is a 31*6da0b38fSAlexey Dobriyan number between 1 and 5. The higher the number, the more debugging 32*6da0b38fSAlexey Dobriyan output is generated. To turn debugging off again, do 33*6da0b38fSAlexey Dobriyan "echo 0 > /sys/kernel/debug/jbd2/jbd2-debug". 34