1*4882a593Smuzhiyun# SPDX-License-Identifier: GPL-2.0-only 2*4882a593Smuzhiyunconfig JBD2 3*4882a593Smuzhiyun tristate 4*4882a593Smuzhiyun select CRC32 5*4882a593Smuzhiyun select CRYPTO 6*4882a593Smuzhiyun select CRYPTO_CRC32C 7*4882a593Smuzhiyun help 8*4882a593Smuzhiyun This is a generic journaling layer for block devices that support 9*4882a593Smuzhiyun both 32-bit and 64-bit block numbers. It is currently used by 10*4882a593Smuzhiyun the ext4 and OCFS2 filesystems, but it could also be used to add 11*4882a593Smuzhiyun journal support to other file systems or block devices such 12*4882a593Smuzhiyun as RAID or LVM. 13*4882a593Smuzhiyun 14*4882a593Smuzhiyun If you are using ext4 or OCFS2, you need to say Y here. 15*4882a593Smuzhiyun If you are not using ext4 or OCFS2 then you will 16*4882a593Smuzhiyun probably want to say N. 17*4882a593Smuzhiyun 18*4882a593Smuzhiyun To compile this device as a module, choose M here. The module will be 19*4882a593Smuzhiyun called jbd2. If you are compiling ext4 or OCFS2 into the kernel, 20*4882a593Smuzhiyun you cannot compile this code as a module. 21*4882a593Smuzhiyun 22*4882a593Smuzhiyunconfig JBD2_DEBUG 23*4882a593Smuzhiyun bool "JBD2 (ext4) debugging support" 24*4882a593Smuzhiyun depends on JBD2 25*4882a593Smuzhiyun help 26*4882a593Smuzhiyun If you are using the ext4 journaled file system (or 27*4882a593Smuzhiyun potentially any other filesystem/device using JBD2), this option 28*4882a593Smuzhiyun allows you to enable debugging output while the system is running, 29*4882a593Smuzhiyun in order to help track down any problems you are having. 30*4882a593Smuzhiyun By default, the debugging output will be turned off. 31*4882a593Smuzhiyun 32*4882a593Smuzhiyun If you select Y here, then you will be able to turn on debugging 33*4882a593Smuzhiyun with "echo N > /sys/module/jbd2/parameters/jbd2_debug", where N is a 34*4882a593Smuzhiyun number between 1 and 5. The higher the number, the more debugging 35*4882a593Smuzhiyun output is generated. To turn debugging off again, do 36*4882a593Smuzhiyun "echo 0 > /sys/module/jbd2/parameters/jbd2_debug". 37