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