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Jan Karac290ea02015-06-18 16:52:29 +02001# 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
Alexey Dobriyan6da0b382008-10-20 22:28:45 +040033config EXT4_FS
34 tristate "The Extended 4 (ext4) filesystem"
Jan Karac290ea02015-06-18 16:52:29 +020035 # Please update EXT3_FS selects when changing these
Alexey Dobriyan6da0b382008-10-20 22:28:45 +040036 select JBD2
37 select CRC16
Darrick J. Wong04419842012-04-29 18:27:10 -040038 select CRYPTO
39 select CRYPTO_CRC32C
Alexey Dobriyan6da0b382008-10-20 22:28:45 +040040 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
Jan Karac8962f42015-07-16 11:20:02 +020052 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.
Alexey Dobriyan6da0b382008-10-20 22:28:45 +040059
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
Jan Karac290ea02015-06-18 16:52:29 +020065config EXT4_USE_FOR_EXT2
Jean Delvared4eb6de2015-09-24 12:38:22 +020066 bool "Use ext4 for ext2 file systems"
David Howells84c66472009-12-21 10:54:09 -050067 depends on EXT4_FS
Jan Karac290ea02015-06-18 16:52:29 +020068 depends on EXT2_FS=n
Theodore Ts'o24b58422009-12-07 14:08:51 -050069 default y
70 help
Jan Karac290ea02015-06-18 16:52:29 +020071 Allow the ext4 file system driver code to be used for ext2
72 file system mounts. This allows users to reduce their
Theodore Ts'o24b58422009-12-07 14:08:51 -050073 compiled kernel size by using one file system driver for
74 ext2, ext3, and ext4 file systems.
75
Alexey Dobriyan6da0b382008-10-20 22:28:45 +040076config EXT4_FS_POSIX_ACL
77 bool "Ext4 POSIX Access Control Lists"
Valerie Aurora96465ef2013-01-06 23:38:44 -050078 depends on EXT4_FS
Alexey Dobriyan6da0b382008-10-20 22:28:45 +040079 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"
Valerie Aurora96465ef2013-01-06 23:38:44 -050091 depends on EXT4_FS
Alexey Dobriyan6da0b382008-10-20 22:28:45 +040092 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.
Theodore Ts'o6ba495e2009-09-18 13:38:55 -0400100
Herbert Xufb63e542015-05-02 10:29:19 -0400101config EXT4_ENCRYPTION
102 tristate "Ext4 Encryption"
Theodore Ts'ob17655f2015-04-11 07:46:47 -0400103 depends on EXT4_FS
104 select CRYPTO_AES
105 select CRYPTO_CBC
106 select CRYPTO_ECB
107 select CRYPTO_XTS
108 select CRYPTO_CTS
Theodore Ts'o71dea012015-05-31 13:31:37 -0400109 select CRYPTO_CTR
Theodore Ts'ob17655f2015-04-11 07:46:47 -0400110 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
Herbert Xufb63e542015-05-02 10:29:19 -0400119config EXT4_FS_ENCRYPTION
120 bool
121 default y
122 depends on EXT4_ENCRYPTION
123
Theodore Ts'o6ba495e2009-09-18 13:38:55 -0400124config 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
Theodore Ts'o7f3e3c72013-04-21 20:32:03 -0400131 with a command such as:
132 echo 1 > /sys/module/ext4/parameters/mballoc_debug