1# SPDX-License-Identifier: GPL-2.0-only 2# Ext3 configs are here for backward compatibility with old configs which may 3# have EXT3_FS set but not EXT4_FS set and thus would result in non-bootable 4# kernels after the removal of ext3 driver. 5config EXT3_FS 6 tristate "The Extended 3 (ext3) filesystem" 7 # These must match EXT4_FS selects... 8 select EXT4_FS 9 select JBD2 10 select CRC16 11 select CRYPTO 12 select CRYPTO_CRC32C 13 help 14 This config option is here only for backward compatibility. ext3 15 filesystem is now handled by the ext4 driver. 16 17config EXT3_FS_POSIX_ACL 18 bool "Ext3 POSIX Access Control Lists" 19 depends on EXT3_FS 20 select EXT4_FS_POSIX_ACL 21 select FS_POSIX_ACL 22 help 23 This config option is here only for backward compatibility. ext3 24 filesystem is now handled by the ext4 driver. 25 26config EXT3_FS_SECURITY 27 bool "Ext3 Security Labels" 28 depends on EXT3_FS 29 select EXT4_FS_SECURITY 30 help 31 This config option is here only for backward compatibility. ext3 32 filesystem is now handled by the ext4 driver. 33 34config EXT4_FS 35 tristate "The Extended 4 (ext4) filesystem" 36 # Please update EXT3_FS selects when changing these 37 select JBD2 38 select CRC16 39 select CRYPTO 40 select CRYPTO_CRC32C 41 select FS_IOMAP 42 select FS_ENCRYPTION_ALGS if FS_ENCRYPTION 43 help 44 This is the next generation of the ext3 filesystem. 45 46 Unlike the change from ext2 filesystem to ext3 filesystem, 47 the on-disk format of ext4 is not forwards compatible with 48 ext3; it is based on extent maps and it supports 48-bit 49 physical block numbers. The ext4 filesystem also supports delayed 50 allocation, persistent preallocation, high resolution time stamps, 51 and a number of other features to improve performance and speed 52 up fsck time. For more information, please see the web pages at 53 http://ext4.wiki.kernel.org. 54 55 The ext4 filesystem supports mounting an ext3 filesystem; while there 56 are some performance gains from the delayed allocation and inode 57 table readahead, the best performance gains require enabling ext4 58 features in the filesystem using tune2fs, or formatting a new 59 filesystem as an ext4 filesystem initially. Without explicit enabling 60 of ext4 features, the on disk filesystem format stays fully backward 61 compatible. 62 63 To compile this file system support as a module, choose M here. The 64 module will be called ext4. 65 66 If unsure, say N. 67 68config EXT4_USE_FOR_EXT2 69 bool "Use ext4 for ext2 file systems" 70 depends on EXT4_FS 71 depends on EXT2_FS=n 72 default y 73 help 74 Allow the ext4 file system driver code to be used for ext2 75 file system mounts. This allows users to reduce their 76 compiled kernel size by using one file system driver for 77 ext2, ext3, and ext4 file systems. 78 79config EXT4_FS_POSIX_ACL 80 bool "Ext4 POSIX Access Control Lists" 81 depends on EXT4_FS 82 select FS_POSIX_ACL 83 help 84 POSIX Access Control Lists (ACLs) support permissions for users and 85 groups beyond the owner/group/world scheme. 86 87 If you don't know what Access Control Lists are, say N 88 89config EXT4_FS_SECURITY 90 bool "Ext4 Security Labels" 91 depends on EXT4_FS 92 help 93 Security labels support alternative access control models 94 implemented by security modules like SELinux. This option 95 enables an extended attribute handler for file security 96 labels in the ext4 filesystem. 97 98 If you are not using a security module that requires using 99 extended attributes for file security labels, say N. 100 101config EXT4_DEBUG 102 bool "Ext4 debugging support" 103 depends on EXT4_FS 104 help 105 Enables run-time debugging support for the ext4 filesystem. 106 107 If you select Y here, then you will be able to turn on debugging 108 with a command such as: 109 echo 1 > /sys/module/ext4/parameters/mballoc_debug 110 111config EXT4_KUNIT_TESTS 112 bool "KUnit tests for ext4" 113 select EXT4_FS 114 depends on KUNIT 115 help 116 This builds the ext4 KUnit tests. 117 118 KUnit tests run during boot and output the results to the debug log 119 in TAP format (http://testanything.org/). Only useful for kernel devs 120 running KUnit test harness and are not for inclusion into a production 121 build. 122 123 For more information on KUnit and unit tests in general please refer 124 to the KUnit documentation in Documentation/dev-tools/kunit/. 125 126 If unsure, say N. 127