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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.
5config EXT3_FS
6 tristate "The Extended 3 (ext3) filesystem"
7 # These must match EXT4_FS selects...
8 select EXT4_FS
9 select JBD2
10 select CRC16
11 select CRYPTO
12 select CRYPTO_CRC32C
13 help
14 This config option is here only for backward compatibility. ext3
15 filesystem is now handled by the ext4 driver.
16
17config EXT3_FS_POSIX_ACL
18 bool "Ext3 POSIX Access Control Lists"
19 depends on EXT3_FS
20 select EXT4_FS_POSIX_ACL
21 select FS_POSIX_ACL
22 help
23 This config option is here only for backward compatibility. ext3
24 filesystem is now handled by the ext4 driver.
25
26config EXT3_FS_SECURITY
27 bool "Ext3 Security Labels"
28 depends on EXT3_FS
29 select EXT4_FS_SECURITY
30 help
31 This config option is here only for backward compatibility. ext3
32 filesystem is now handled by the ext4 driver.
33
34config EXT4_FS
35 tristate "The Extended 4 (ext4) filesystem"
36 # Please update EXT3_FS selects when changing these
37 select JBD2
38 select CRC16
39 select CRYPTO
40 select CRYPTO_CRC32C
41 select FS_IOMAP
42 help
43 This is the next generation of the ext3 filesystem.
44
45 Unlike the change from ext2 filesystem to ext3 filesystem,
46 the on-disk format of ext4 is not forwards compatible with
47 ext3; it is based on extent maps and it supports 48-bit
48 physical block numbers. The ext4 filesystem also supports delayed
49 allocation, persistent preallocation, high resolution time stamps,
50 and a number of other features to improve performance and speed
51 up fsck time. For more information, please see the web pages at
52 http://ext4.wiki.kernel.org.
53
54 The ext4 filesystem supports mounting an ext3 filesystem; while there
55 are some performance gains from the delayed allocation and inode
56 table readahead, the best performance gains require enabling ext4
57 features in the filesystem using tune2fs, or formatting a new
58 filesystem as an ext4 filesystem initially. Without explicit enabling
59 of ext4 features, the on disk filesystem format stays fully backward
60 compatible.
61
62 To compile this file system support as a module, choose M here. The
63 module will be called ext4.
64
65 If unsure, say N.
66
67config EXT4_USE_FOR_EXT2
68 bool "Use ext4 for ext2 file systems"
69 depends on EXT4_FS
70 depends on EXT2_FS=n
71 default y
72 help
73 Allow the ext4 file system driver code to be used for ext2
74 file system mounts. This allows users to reduce their
75 compiled kernel size by using one file system driver for
76 ext2, ext3, and ext4 file systems.
77
78config EXT4_FS_POSIX_ACL
79 bool "Ext4 POSIX Access Control Lists"
80 depends on EXT4_FS
81 select FS_POSIX_ACL
82 help
83 POSIX Access Control Lists (ACLs) support permissions for users and
84 groups beyond the owner/group/world scheme.
85
86 If you don't know what Access Control Lists are, say N
87
88config EXT4_FS_SECURITY
89 bool "Ext4 Security Labels"
90 depends on EXT4_FS
91 help
92 Security labels support alternative access control models
93 implemented by security modules like SELinux. This option
94 enables an extended attribute handler for file security
95 labels in the ext4 filesystem.
96
97 If you are not using a security module that requires using
98 extended attributes for file security labels, say N.
99
100config EXT4_DEBUG
101 bool "Ext4 debugging support"
102 depends on EXT4_FS
103 help
104 Enables run-time debugging support for the ext4 filesystem.
105
106 If you select Y here, then you will be able to turn on debugging
107 with a command such as:
108 echo 1 > /sys/module/ext4/parameters/mballoc_debug