Commit | Line | Data |
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c290ea01 JK |
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. | |
4 | config 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 | ||
16 | config 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 | ||
25 | config 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 | ||
6da0b38f AD |
33 | config EXT4_FS |
34 | tristate "The Extended 4 (ext4) filesystem" | |
c290ea01 | 35 | # Please update EXT3_FS selects when changing these |
6da0b38f AD |
36 | select JBD2 |
37 | select CRC16 | |
0441984a DW |
38 | select CRYPTO |
39 | select CRYPTO_CRC32C | |
6da0b38f AD |
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 will support mounting an ext3 | |
53 | filesystem; while there will be some performance gains from | |
54 | the delayed allocation and inode table readahead, the best | |
55 | performance gains will require enabling ext4 features in the | |
692105b8 | 56 | filesystem, or formatting a new filesystem as an ext4 |
6da0b38f AD |
57 | filesystem initially. |
58 | ||
59 | To compile this file system support as a module, choose M here. The | |
60 | module will be called ext4. | |
61 | ||
62 | If unsure, say N. | |
63 | ||
c290ea01 | 64 | config EXT4_USE_FOR_EXT2 |
24b58424 | 65 | bool "Use ext4 for ext2/ext3 file systems" |
84c66473 | 66 | depends on EXT4_FS |
c290ea01 | 67 | depends on EXT2_FS=n |
24b58424 TT |
68 | default y |
69 | help | |
c290ea01 JK |
70 | Allow the ext4 file system driver code to be used for ext2 |
71 | file system mounts. This allows users to reduce their | |
24b58424 TT |
72 | compiled kernel size by using one file system driver for |
73 | ext2, ext3, and ext4 file systems. | |
74 | ||
6da0b38f AD |
75 | config EXT4_FS_POSIX_ACL |
76 | bool "Ext4 POSIX Access Control Lists" | |
96465efe | 77 | depends on EXT4_FS |
6da0b38f AD |
78 | select FS_POSIX_ACL |
79 | help | |
80 | POSIX Access Control Lists (ACLs) support permissions for users and | |
81 | groups beyond the owner/group/world scheme. | |
82 | ||
83 | To learn more about Access Control Lists, visit the POSIX ACLs for | |
84 | Linux website <http://acl.bestbits.at/>. | |
85 | ||
86 | If you don't know what Access Control Lists are, say N | |
87 | ||
88 | config EXT4_FS_SECURITY | |
89 | bool "Ext4 Security Labels" | |
96465efe | 90 | depends on EXT4_FS |
6da0b38f AD |
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. | |
6ba495e9 | 99 | |
fb63e548 HX |
100 | config EXT4_ENCRYPTION |
101 | tristate "Ext4 Encryption" | |
b17655fb TT |
102 | depends on EXT4_FS |
103 | select CRYPTO_AES | |
104 | select CRYPTO_CBC | |
105 | select CRYPTO_ECB | |
106 | select CRYPTO_XTS | |
107 | select CRYPTO_CTS | |
71dea01e | 108 | select CRYPTO_CTR |
b17655fb TT |
109 | select CRYPTO_SHA256 |
110 | select KEYS | |
111 | select ENCRYPTED_KEYS | |
112 | help | |
113 | Enable encryption of ext4 files and directories. This | |
114 | feature is similar to ecryptfs, but it is more memory | |
115 | efficient since it avoids caching the encrypted and | |
116 | decrypted pages in the page cache. | |
117 | ||
fb63e548 HX |
118 | config EXT4_FS_ENCRYPTION |
119 | bool | |
120 | default y | |
121 | depends on EXT4_ENCRYPTION | |
122 | ||
6ba495e9 TT |
123 | config EXT4_DEBUG |
124 | bool "EXT4 debugging support" | |
125 | depends on EXT4_FS | |
126 | help | |
127 | Enables run-time debugging support for the ext4 filesystem. | |
128 | ||
129 | If you select Y here, then you will be able to turn on debugging | |
7f3e3c7c TT |
130 | with a command such as: |
131 | echo 1 > /sys/module/ext4/parameters/mballoc_debug |