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TOMOYO Linux Cross Reference
Linux/fs/ext4/Kconfig

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  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.
  5 config 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 
 12 config 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 
 21 config 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 
 29 config 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 
 63 config 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 
 74 config 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 
 84 config 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 
 96 config 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 
105 config 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.

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