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1# Ext3 configs are here for backward compatibility with old configs which may
2# have EXT3_FS set but not EXT4_FS set and thus would result in non-bootable
3# kernels after the removal of ext3 driver.
4config EXT3_FS
5 tristate "The Extended 3 (ext3) filesystem"
6 # These must match EXT4_FS selects...
7 select EXT4_FS
8 select JBD2
9 select CRC16
10 select CRYPTO
11 select CRYPTO_CRC32C
12 help
13 This config option is here only for backward compatibility. ext3
14 filesystem is now handled by the ext4 driver.
15
16config EXT3_FS_POSIX_ACL
17 bool "Ext3 POSIX Access Control Lists"
18 depends on EXT3_FS
19 select EXT4_FS_POSIX_ACL
20 select FS_POSIX_ACL
21 help
22 This config option is here only for backward compatibility. ext3
23 filesystem is now handled by the ext4 driver.
24
25config EXT3_FS_SECURITY
26 bool "Ext3 Security Labels"
27 depends on EXT3_FS
28 select EXT4_FS_SECURITY
29 help
30 This config option is here only for backward compatibility. ext3
31 filesystem is now handled by the ext4 driver.
32
33config EXT4_FS
34 tristate "The Extended 4 (ext4) filesystem"
35 # Please update EXT3_FS selects when changing these
36 select JBD2
37 select CRC16
38 select CRYPTO
39 select CRYPTO_CRC32C
40 help
41 This is the next generation of the ext3 filesystem.
42
43 Unlike the change from ext2 filesystem to ext3 filesystem,
44 the on-disk format of ext4 is not forwards compatible with
45 ext3; it is based on extent maps and it supports 48-bit
46 physical block numbers. The ext4 filesystem also supports delayed
47 allocation, persistent preallocation, high resolution time stamps,
48 and a number of other features to improve performance and speed
49 up fsck time. For more information, please see the web pages at
50 http://ext4.wiki.kernel.org.
51
52 The ext4 filesystem supports mounting an ext3 filesystem; while there
53 are some performance gains from the delayed allocation and inode
54 table readahead, the best performance gains require enabling ext4
55 features in the filesystem using tune2fs, or formatting a new
56 filesystem as an ext4 filesystem initially. Without explicit enabling
57 of ext4 features, the on disk filesystem format stays fully backward
58 compatible.
59
60 To compile this file system support as a module, choose M here. The
61 module will be called ext4.
62
63 If unsure, say N.
64
65config EXT4_USE_FOR_EXT2
66 bool "Use ext4 for ext2 file systems"
67 depends on EXT4_FS
68 depends on EXT2_FS=n
69 default y
70 help
71 Allow the ext4 file system driver code to be used for ext2
72 file system mounts. This allows users to reduce their
73 compiled kernel size by using one file system driver for
74 ext2, ext3, and ext4 file systems.
75
76config EXT4_FS_POSIX_ACL
77 bool "Ext4 POSIX Access Control Lists"
78 depends on EXT4_FS
79 select FS_POSIX_ACL
80 help
81 POSIX Access Control Lists (ACLs) support permissions for users and
82 groups beyond the owner/group/world scheme.
83
84 To learn more about Access Control Lists, visit the POSIX ACLs for
85 Linux website <http://acl.bestbits.at/>.
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_ENCRYPTION
102 tristate "Ext4 Encryption"
103 depends on EXT4_FS
104 select CRYPTO_AES
105 select CRYPTO_CBC
106 select CRYPTO_ECB
107 select CRYPTO_XTS
108 select CRYPTO_CTS
109 select CRYPTO_CTR
110 select CRYPTO_SHA256
111 select KEYS
112 select ENCRYPTED_KEYS
113 help
114 Enable encryption of ext4 files and directories. This
115 feature is similar to ecryptfs, but it is more memory
116 efficient since it avoids caching the encrypted and
117 decrypted pages in the page cache.
118
119config EXT4_FS_ENCRYPTION
120 bool
121 default y
122 depends on EXT4_ENCRYPTION
123
124config EXT4_DEBUG
125 bool "EXT4 debugging support"
126 depends on EXT4_FS
127 help
128 Enables run-time debugging support for the ext4 filesystem.
129
130 If you select Y here, then you will be able to turn on debugging
131 with a command such as:
132 echo 1 > /sys/module/ext4/parameters/mballoc_debug
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.