16da0b38fSAlexey Dobriyanconfig JBD2 26da0b38fSAlexey Dobriyan tristate 36da0b38fSAlexey Dobriyan select CRC32 401b5adceSDarrick J. Wong select CRYPTO 501b5adceSDarrick J. Wong select CRYPTO_CRC32C 66da0b38fSAlexey Dobriyan help 76da0b38fSAlexey Dobriyan This is a generic journaling layer for block devices that support 86da0b38fSAlexey Dobriyan both 32-bit and 64-bit block numbers. It is currently used by 96da0b38fSAlexey Dobriyan the ext4 and OCFS2 filesystems, but it could also be used to add 106da0b38fSAlexey Dobriyan journal support to other file systems or block devices such 116da0b38fSAlexey Dobriyan as RAID or LVM. 126da0b38fSAlexey Dobriyan 136da0b38fSAlexey Dobriyan If you are using ext4 or OCFS2, you need to say Y here. 146da0b38fSAlexey Dobriyan If you are not using ext4 or OCFS2 then you will 156da0b38fSAlexey Dobriyan probably want to say N. 166da0b38fSAlexey Dobriyan 176da0b38fSAlexey Dobriyan To compile this device as a module, choose M here. The module will be 186da0b38fSAlexey Dobriyan called jbd2. If you are compiling ext4 or OCFS2 into the kernel, 196da0b38fSAlexey Dobriyan you cannot compile this code as a module. 206da0b38fSAlexey Dobriyan 216da0b38fSAlexey Dobriyanconfig JBD2_DEBUG 226da0b38fSAlexey Dobriyan bool "JBD2 (ext4) debugging support" 236da0b38fSAlexey Dobriyan depends on JBD2 && DEBUG_FS 246da0b38fSAlexey Dobriyan help 256da0b38fSAlexey Dobriyan If you are using the ext4 journaled file system (or 266da0b38fSAlexey Dobriyan potentially any other filesystem/device using JBD2), this option 276da0b38fSAlexey Dobriyan allows you to enable debugging output while the system is running, 286da0b38fSAlexey Dobriyan in order to help track down any problems you are having. 296da0b38fSAlexey Dobriyan By default, the debugging output will be turned off. 306da0b38fSAlexey Dobriyan 316da0b38fSAlexey Dobriyan If you select Y here, then you will be able to turn on debugging 326da0b38fSAlexey Dobriyan with "echo N > /sys/kernel/debug/jbd2/jbd2-debug", where N is a 336da0b38fSAlexey Dobriyan number between 1 and 5. The higher the number, the more debugging 346da0b38fSAlexey Dobriyan output is generated. To turn debugging off again, do 356da0b38fSAlexey Dobriyan "echo 0 > /sys/kernel/debug/jbd2/jbd2-debug". 36