1 # SPDX-License-Identifier: GPL-2.0-only <<
2 # Ext3 configs are here for backward compatibi 1 # Ext3 configs are here for backward compatibility with old configs which may
3 # have EXT3_FS set but not EXT4_FS set and thu 2 # have EXT3_FS set but not EXT4_FS set and thus would result in non-bootable
4 # kernels after the removal of ext3 driver. 3 # kernels after the removal of ext3 driver.
5 config EXT3_FS 4 config EXT3_FS
6 tristate "The Extended 3 (ext3) filesy 5 tristate "The Extended 3 (ext3) filesystem"
>> 6 # These must match EXT4_FS selects...
7 select EXT4_FS 7 select EXT4_FS
>> 8 select JBD2
>> 9 select CRC16
>> 10 select CRYPTO
>> 11 select CRYPTO_CRC32C
8 help 12 help
9 This config option is here only for 13 This config option is here only for backward compatibility. ext3
10 filesystem is now handled by the ext 14 filesystem is now handled by the ext4 driver.
11 15
12 config EXT3_FS_POSIX_ACL 16 config EXT3_FS_POSIX_ACL
13 bool "Ext3 POSIX Access Control Lists" 17 bool "Ext3 POSIX Access Control Lists"
14 depends on EXT3_FS 18 depends on EXT3_FS
15 select EXT4_FS_POSIX_ACL 19 select EXT4_FS_POSIX_ACL
16 select FS_POSIX_ACL 20 select FS_POSIX_ACL
17 help 21 help
18 This config option is here only for 22 This config option is here only for backward compatibility. ext3
19 filesystem is now handled by the ext 23 filesystem is now handled by the ext4 driver.
20 24
21 config EXT3_FS_SECURITY 25 config EXT3_FS_SECURITY
22 bool "Ext3 Security Labels" 26 bool "Ext3 Security Labels"
23 depends on EXT3_FS 27 depends on EXT3_FS
24 select EXT4_FS_SECURITY 28 select EXT4_FS_SECURITY
25 help 29 help
26 This config option is here only for 30 This config option is here only for backward compatibility. ext3
27 filesystem is now handled by the ext 31 filesystem is now handled by the ext4 driver.
28 32
29 config EXT4_FS 33 config EXT4_FS
30 tristate "The Extended 4 (ext4) filesy 34 tristate "The Extended 4 (ext4) filesystem"
31 select BUFFER_HEAD !! 35 # Please update EXT3_FS selects when changing these
32 select JBD2 36 select JBD2
33 select CRC16 37 select CRC16
34 select CRYPTO 38 select CRYPTO
35 select CRYPTO_CRC32C 39 select CRYPTO_CRC32C
36 select FS_IOMAP <<
37 select FS_ENCRYPTION_ALGS if FS_ENCRYP <<
38 help 40 help
39 This is the next generation of the e 41 This is the next generation of the ext3 filesystem.
40 42
41 Unlike the change from ext2 filesyst 43 Unlike the change from ext2 filesystem to ext3 filesystem,
42 the on-disk format of ext4 is not fo 44 the on-disk format of ext4 is not forwards compatible with
43 ext3; it is based on extent maps and 45 ext3; it is based on extent maps and it supports 48-bit
44 physical block numbers. The ext4 fi 46 physical block numbers. The ext4 filesystem also supports delayed
45 allocation, persistent preallocation 47 allocation, persistent preallocation, high resolution time stamps,
46 and a number of other features to im 48 and a number of other features to improve performance and speed
47 up fsck time. For more information, 49 up fsck time. For more information, please see the web pages at
48 http://ext4.wiki.kernel.org. 50 http://ext4.wiki.kernel.org.
49 51
50 The ext4 filesystem supports mountin 52 The ext4 filesystem supports mounting an ext3 filesystem; while there
51 are some performance gains from the 53 are some performance gains from the delayed allocation and inode
52 table readahead, the best performanc 54 table readahead, the best performance gains require enabling ext4
53 features in the filesystem using tun 55 features in the filesystem using tune2fs, or formatting a new
54 filesystem as an ext4 filesystem ini 56 filesystem as an ext4 filesystem initially. Without explicit enabling
55 of ext4 features, the on disk filesy 57 of ext4 features, the on disk filesystem format stays fully backward
56 compatible. 58 compatible.
57 59
58 To compile this file system support 60 To compile this file system support as a module, choose M here. The
59 module will be called ext4. 61 module will be called ext4.
60 62
61 If unsure, say N. 63 If unsure, say N.
62 64
63 config EXT4_USE_FOR_EXT2 65 config EXT4_USE_FOR_EXT2
64 bool "Use ext4 for ext2 file systems" 66 bool "Use ext4 for ext2 file systems"
65 depends on EXT4_FS 67 depends on EXT4_FS
66 depends on EXT2_FS=n 68 depends on EXT2_FS=n
67 default y 69 default y
68 help 70 help
69 Allow the ext4 file system driver co 71 Allow the ext4 file system driver code to be used for ext2
70 file system mounts. This allows use 72 file system mounts. This allows users to reduce their
71 compiled kernel size by using one fi 73 compiled kernel size by using one file system driver for
72 ext2, ext3, and ext4 file systems. 74 ext2, ext3, and ext4 file systems.
73 75
74 config EXT4_FS_POSIX_ACL 76 config EXT4_FS_POSIX_ACL
75 bool "Ext4 POSIX Access Control Lists" 77 bool "Ext4 POSIX Access Control Lists"
76 depends on EXT4_FS 78 depends on EXT4_FS
77 select FS_POSIX_ACL 79 select FS_POSIX_ACL
78 help 80 help
79 POSIX Access Control Lists (ACLs) su 81 POSIX Access Control Lists (ACLs) support permissions for users and
80 groups beyond the owner/group/world 82 groups beyond the owner/group/world scheme.
81 83
>> 84 To learn more about Access Control Lists, visit the POSIX ACLs for
>> 85 Linux website <http://acl.bestbits.at/>.
>> 86
82 If you don't know what Access Contro 87 If you don't know what Access Control Lists are, say N
83 88
84 config EXT4_FS_SECURITY 89 config EXT4_FS_SECURITY
85 bool "Ext4 Security Labels" 90 bool "Ext4 Security Labels"
86 depends on EXT4_FS 91 depends on EXT4_FS
87 help 92 help
88 Security labels support alternative 93 Security labels support alternative access control models
89 implemented by security modules like 94 implemented by security modules like SELinux. This option
90 enables an extended attribute handle 95 enables an extended attribute handler for file security
91 labels in the ext4 filesystem. 96 labels in the ext4 filesystem.
92 97
93 If you are not using a security modu 98 If you are not using a security module that requires using
94 extended attributes for file securit 99 extended attributes for file security labels, say N.
95 100
>> 101 config 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
>> 119 config EXT4_FS_ENCRYPTION
>> 120 bool
>> 121 default y
>> 122 depends on EXT4_ENCRYPTION
>> 123
96 config EXT4_DEBUG 124 config EXT4_DEBUG
97 bool "Ext4 debugging support" !! 125 bool "EXT4 debugging support"
98 depends on EXT4_FS 126 depends on EXT4_FS
99 help 127 help
100 Enables run-time debugging support f 128 Enables run-time debugging support for the ext4 filesystem.
101 129
102 If you select Y here, then you will 130 If you select Y here, then you will be able to turn on debugging
103 using dynamic debug control for mb_d !! 131 with a command such as:
104 !! 132 echo 1 > /sys/module/ext4/parameters/mballoc_debug
105 config EXT4_KUNIT_TESTS <<
106 tristate "KUnit tests for ext4" if !KU <<
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 outp <<
113 in TAP format (https://testanything. <<
114 running KUnit test harness and are n <<
115 build. <<
116 <<
117 For more information on KUnit and un <<
118 to the KUnit documentation in Docume <<
119 <<
120 If unsure, say N. <<
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