16da0b38fSAlexey Dobriyanconfig JBD2 26da0b38fSAlexey Dobriyan tristate 36da0b38fSAlexey Dobriyan select CRC32 46da0b38fSAlexey Dobriyan help 56da0b38fSAlexey Dobriyan This is a generic journaling layer for block devices that support 66da0b38fSAlexey Dobriyan both 32-bit and 64-bit block numbers. It is currently used by 76da0b38fSAlexey Dobriyan the ext4 and OCFS2 filesystems, but it could also be used to add 86da0b38fSAlexey Dobriyan journal support to other file systems or block devices such 96da0b38fSAlexey Dobriyan as RAID or LVM. 106da0b38fSAlexey Dobriyan 116da0b38fSAlexey Dobriyan If you are using ext4 or OCFS2, you need to say Y here. 126da0b38fSAlexey Dobriyan If you are not using ext4 or OCFS2 then you will 136da0b38fSAlexey Dobriyan probably want to say N. 146da0b38fSAlexey Dobriyan 156da0b38fSAlexey Dobriyan To compile this device as a module, choose M here. The module will be 166da0b38fSAlexey Dobriyan called jbd2. If you are compiling ext4 or OCFS2 into the kernel, 176da0b38fSAlexey Dobriyan you cannot compile this code as a module. 186da0b38fSAlexey Dobriyan 196da0b38fSAlexey Dobriyanconfig JBD2_DEBUG 206da0b38fSAlexey Dobriyan bool "JBD2 (ext4) debugging support" 216da0b38fSAlexey Dobriyan depends on JBD2 && DEBUG_FS 226da0b38fSAlexey Dobriyan help 236da0b38fSAlexey Dobriyan If you are using the ext4 journaled file system (or 246da0b38fSAlexey Dobriyan potentially any other filesystem/device using JBD2), this option 256da0b38fSAlexey Dobriyan allows you to enable debugging output while the system is running, 266da0b38fSAlexey Dobriyan in order to help track down any problems you are having. 276da0b38fSAlexey Dobriyan By default, the debugging output will be turned off. 286da0b38fSAlexey Dobriyan 296da0b38fSAlexey Dobriyan If you select Y here, then you will be able to turn on debugging 306da0b38fSAlexey Dobriyan with "echo N > /sys/kernel/debug/jbd2/jbd2-debug", where N is a 316da0b38fSAlexey Dobriyan number between 1 and 5. The higher the number, the more debugging 326da0b38fSAlexey Dobriyan output is generated. To turn debugging off again, do 336da0b38fSAlexey Dobriyan "echo 0 > /sys/kernel/debug/jbd2/jbd2-debug". 34