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 # These must match EXT4_FS selects...
7 select EXT4_FS 8 select EXT4_FS
>> 9 select JBD2
>> 10 select CRC16
>> 11 select CRYPTO
>> 12 select CRYPTO_CRC32C
8 help 13 help
9 This config option is here only for 14 This config option is here only for backward compatibility. ext3
10 filesystem is now handled by the ext 15 filesystem is now handled by the ext4 driver.
11 16
12 config EXT3_FS_POSIX_ACL 17 config EXT3_FS_POSIX_ACL
13 bool "Ext3 POSIX Access Control Lists" 18 bool "Ext3 POSIX Access Control Lists"
14 depends on EXT3_FS 19 depends on EXT3_FS
15 select EXT4_FS_POSIX_ACL 20 select EXT4_FS_POSIX_ACL
16 select FS_POSIX_ACL 21 select FS_POSIX_ACL
17 help 22 help
18 This config option is here only for 23 This config option is here only for backward compatibility. ext3
19 filesystem is now handled by the ext 24 filesystem is now handled by the ext4 driver.
20 25
21 config EXT3_FS_SECURITY 26 config EXT3_FS_SECURITY
22 bool "Ext3 Security Labels" 27 bool "Ext3 Security Labels"
23 depends on EXT3_FS 28 depends on EXT3_FS
24 select EXT4_FS_SECURITY 29 select EXT4_FS_SECURITY
25 help 30 help
26 This config option is here only for 31 This config option is here only for backward compatibility. ext3
27 filesystem is now handled by the ext 32 filesystem is now handled by the ext4 driver.
28 33
29 config EXT4_FS 34 config EXT4_FS
30 tristate "The Extended 4 (ext4) filesy 35 tristate "The Extended 4 (ext4) filesystem"
31 select BUFFER_HEAD !! 36 # Please update EXT3_FS selects when changing these
32 select JBD2 37 select JBD2
33 select CRC16 38 select CRC16
34 select CRYPTO 39 select CRYPTO
35 select CRYPTO_CRC32C 40 select CRYPTO_CRC32C
36 select FS_IOMAP 41 select FS_IOMAP
37 select FS_ENCRYPTION_ALGS if FS_ENCRYP <<
38 help 42 help
39 This is the next generation of the e 43 This is the next generation of the ext3 filesystem.
40 44
41 Unlike the change from ext2 filesyst 45 Unlike the change from ext2 filesystem to ext3 filesystem,
42 the on-disk format of ext4 is not fo 46 the on-disk format of ext4 is not forwards compatible with
43 ext3; it is based on extent maps and 47 ext3; it is based on extent maps and it supports 48-bit
44 physical block numbers. The ext4 fi 48 physical block numbers. The ext4 filesystem also supports delayed
45 allocation, persistent preallocation 49 allocation, persistent preallocation, high resolution time stamps,
46 and a number of other features to im 50 and a number of other features to improve performance and speed
47 up fsck time. For more information, 51 up fsck time. For more information, please see the web pages at
48 http://ext4.wiki.kernel.org. 52 http://ext4.wiki.kernel.org.
49 53
50 The ext4 filesystem supports mountin 54 The ext4 filesystem supports mounting an ext3 filesystem; while there
51 are some performance gains from the 55 are some performance gains from the delayed allocation and inode
52 table readahead, the best performanc 56 table readahead, the best performance gains require enabling ext4
53 features in the filesystem using tun 57 features in the filesystem using tune2fs, or formatting a new
54 filesystem as an ext4 filesystem ini 58 filesystem as an ext4 filesystem initially. Without explicit enabling
55 of ext4 features, the on disk filesy 59 of ext4 features, the on disk filesystem format stays fully backward
56 compatible. 60 compatible.
57 61
58 To compile this file system support 62 To compile this file system support as a module, choose M here. The
59 module will be called ext4. 63 module will be called ext4.
60 64
61 If unsure, say N. 65 If unsure, say N.
62 66
63 config EXT4_USE_FOR_EXT2 67 config EXT4_USE_FOR_EXT2
64 bool "Use ext4 for ext2 file systems" 68 bool "Use ext4 for ext2 file systems"
65 depends on EXT4_FS 69 depends on EXT4_FS
66 depends on EXT2_FS=n 70 depends on EXT2_FS=n
67 default y 71 default y
68 help 72 help
69 Allow the ext4 file system driver co 73 Allow the ext4 file system driver code to be used for ext2
70 file system mounts. This allows use 74 file system mounts. This allows users to reduce their
71 compiled kernel size by using one fi 75 compiled kernel size by using one file system driver for
72 ext2, ext3, and ext4 file systems. 76 ext2, ext3, and ext4 file systems.
73 77
74 config EXT4_FS_POSIX_ACL 78 config EXT4_FS_POSIX_ACL
75 bool "Ext4 POSIX Access Control Lists" 79 bool "Ext4 POSIX Access Control Lists"
76 depends on EXT4_FS 80 depends on EXT4_FS
77 select FS_POSIX_ACL 81 select FS_POSIX_ACL
78 help 82 help
79 POSIX Access Control Lists (ACLs) su 83 POSIX Access Control Lists (ACLs) support permissions for users and
80 groups beyond the owner/group/world 84 groups beyond the owner/group/world scheme.
81 85
82 If you don't know what Access Contro 86 If you don't know what Access Control Lists are, say N
83 87
84 config EXT4_FS_SECURITY 88 config EXT4_FS_SECURITY
85 bool "Ext4 Security Labels" 89 bool "Ext4 Security Labels"
86 depends on EXT4_FS 90 depends on EXT4_FS
87 help 91 help
88 Security labels support alternative 92 Security labels support alternative access control models
89 implemented by security modules like 93 implemented by security modules like SELinux. This option
90 enables an extended attribute handle 94 enables an extended attribute handler for file security
91 labels in the ext4 filesystem. 95 labels in the ext4 filesystem.
92 96
93 If you are not using a security modu 97 If you are not using a security module that requires using
94 extended attributes for file securit 98 extended attributes for file security labels, say N.
95 99
96 config EXT4_DEBUG 100 config EXT4_DEBUG
97 bool "Ext4 debugging support" 101 bool "Ext4 debugging support"
98 depends on EXT4_FS 102 depends on EXT4_FS
99 help 103 help
100 Enables run-time debugging support f 104 Enables run-time debugging support for the ext4 filesystem.
101 105
102 If you select Y here, then you will 106 If you select Y here, then you will be able to turn on debugging
103 using dynamic debug control for mb_d !! 107 with a command such as:
>> 108 echo 1 > /sys/module/ext4/parameters/mballoc_debug
104 109
105 config EXT4_KUNIT_TESTS 110 config EXT4_KUNIT_TESTS
106 tristate "KUnit tests for ext4" if !KU !! 111 bool "KUnit tests for ext4"
107 depends on EXT4_FS && KUNIT !! 112 select EXT4_FS
108 default KUNIT_ALL_TESTS !! 113 depends on KUNIT
109 help 114 help
110 This builds the ext4 KUnit tests. 115 This builds the ext4 KUnit tests.
111 116
112 KUnit tests run during boot and outp 117 KUnit tests run during boot and output the results to the debug log
113 in TAP format (https://testanything. !! 118 in TAP format (http://testanything.org/). Only useful for kernel devs
114 running KUnit test harness and are n 119 running KUnit test harness and are not for inclusion into a production
115 build. 120 build.
116 121
117 For more information on KUnit and un 122 For more information on KUnit and unit tests in general please refer
118 to the KUnit documentation in Docume 123 to the KUnit documentation in Documentation/dev-tools/kunit/.
119 124
120 If unsure, say N. 125 If unsure, say N.
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