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