projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | ||
| c8962f4b JK |
52 | 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. | |
| 6da0b38f AD |
59 | |
| 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 | ||
| c290ea01 | 65 | config EXT4_USE_FOR_EXT2 |
| d4eb6dee | 66 | bool "Use ext4 for ext2 file systems" |
| 84c66473 | 67 | depends on EXT4_FS |
| c290ea01 | 68 | depends on EXT2_FS=n |
| 24b58424 TT |
69 | default y |
| 70 | help | |
| c290ea01 JK |
71 | Allow the ext4 file system driver code to be used for ext2 |
| 72 | file system mounts. This allows users to reduce their | |
| 24b58424 TT |
73 | compiled kernel size by using one file system driver for |
| 74 | ext2, ext3, and ext4 file systems. | |
| 75 | ||
| 6da0b38f AD |
76 | config EXT4_FS_POSIX_ACL |
| 77 | bool "Ext4 POSIX Access Control Lists" | |
| 96465efe | 78 | depends on EXT4_FS |
| 6da0b38f AD |
79 | 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 | ||
| 89 | config EXT4_FS_SECURITY | |
| 90 | bool "Ext4 Security Labels" | |
| 96465efe | 91 | depends on EXT4_FS |
| 6da0b38f AD |
92 | 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. | |
| 6ba495e9 | 100 | |
| fb63e548 HX |
101 | config EXT4_ENCRYPTION |
| 102 | tristate "Ext4 Encryption" | |
| b17655fb TT |
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 | |
| 71dea01e | 109 | select CRYPTO_CTR |
| b17655fb TT |
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 | ||
| fb63e548 HX |
119 | config EXT4_FS_ENCRYPTION |
| 120 | bool | |
| 121 | default y | |
| 122 | depends on EXT4_ENCRYPTION | |
| 123 | ||
| 6ba495e9 TT |
124 | config 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 | |
| 7f3e3c7c TT |
131 | with a command such as: |
| 132 | echo 1 > /sys/module/ext4/parameters/mballoc_debug |