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