| # Ext3 configs are here for backward compatibility with old configs which may | |
| # have EXT3_FS set but not EXT4_FS set and thus would result in non-bootable | |
| # kernels after the removal of ext3 driver. | |
| config EXT3_FS | |
| tristate "The Extended 3 (ext3) filesystem" | |
| # These must match EXT4_FS selects... | |
| select EXT4_FS | |
| select JBD2 | |
| select CRC16 | |
| select CRYPTO | |
| select CRYPTO_CRC32C | |
| help | |
| This config option is here only for backward compatibility. ext3 | |
| filesystem is now handled by the ext4 driver. | |
| config EXT3_FS_POSIX_ACL | |
| bool "Ext3 POSIX Access Control Lists" | |
| depends on EXT3_FS | |
| select EXT4_FS_POSIX_ACL | |
| select FS_POSIX_ACL | |
| help | |
| This config option is here only for backward compatibility. ext3 | |
| filesystem is now handled by the ext4 driver. | |
| config EXT3_FS_SECURITY | |
| bool "Ext3 Security Labels" | |
| depends on EXT3_FS | |
| select EXT4_FS_SECURITY | |
| help | |
| This config option is here only for backward compatibility. ext3 | |
| filesystem is now handled by the ext4 driver. | |
| config EXT4_FS | |
| tristate "The Extended 4 (ext4) filesystem" | |
| # Please update EXT3_FS selects when changing these | |
| select JBD2 | |
| select CRC16 | |
| select CRYPTO | |
| select CRYPTO_CRC32C | |
| select FS_IOMAP | |
| help | |
| This is the next generation of the ext3 filesystem. | |
| Unlike the change from ext2 filesystem to ext3 filesystem, | |
| the on-disk format of ext4 is not forwards compatible with | |
| ext3; it is based on extent maps and it supports 48-bit | |
| physical block numbers. The ext4 filesystem also supports delayed | |
| allocation, persistent preallocation, high resolution time stamps, | |
| and a number of other features to improve performance and speed | |
| up fsck time. For more information, please see the web pages at | |
| http://ext4.wiki.kernel.org. | |
| The ext4 filesystem supports mounting an ext3 filesystem; while there | |
| are some performance gains from the delayed allocation and inode | |
| table readahead, the best performance gains require enabling ext4 | |
| features in the filesystem using tune2fs, or formatting a new | |
| filesystem as an ext4 filesystem initially. Without explicit enabling | |
| of ext4 features, the on disk filesystem format stays fully backward | |
| compatible. | |
| To compile this file system support as a module, choose M here. The | |
| module will be called ext4. | |
| If unsure, say N. | |
| config EXT4_USE_FOR_EXT2 | |
| bool "Use ext4 for ext2 file systems" | |
| depends on EXT4_FS | |
| depends on EXT2_FS=n | |
| default y | |
| help | |
| Allow the ext4 file system driver code to be used for ext2 | |
| file system mounts. This allows users to reduce their | |
| compiled kernel size by using one file system driver for | |
| ext2, ext3, and ext4 file systems. | |
| config EXT4_FS_POSIX_ACL | |
| bool "Ext4 POSIX Access Control Lists" | |
| depends on EXT4_FS | |
| select FS_POSIX_ACL | |
| help | |
| POSIX Access Control Lists (ACLs) support permissions for users and | |
| groups beyond the owner/group/world scheme. | |
| If you don't know what Access Control Lists are, say N | |
| config EXT4_FS_SECURITY | |
| bool "Ext4 Security Labels" | |
| depends on EXT4_FS | |
| help | |
| Security labels support alternative access control models | |
| implemented by security modules like SELinux. This option | |
| enables an extended attribute handler for file security | |
| labels in the ext4 filesystem. | |
| If you are not using a security module that requires using | |
| extended attributes for file security labels, say N. | |
| config EXT4_ENCRYPTION | |
| bool "Ext4 Encryption" | |
| depends on EXT4_FS | |
| select FS_ENCRYPTION | |
| help | |
| Enable encryption of ext4 files and directories. This | |
| feature is similar to ecryptfs, but it is more memory | |
| efficient since it avoids caching the encrypted and | |
| decrypted pages in the page cache. | |
| config EXT4_FS_ENCRYPTION | |
| bool | |
| default y | |
| depends on EXT4_ENCRYPTION | |
| config EXT4_DEBUG | |
| bool "EXT4 debugging support" | |
| depends on EXT4_FS | |
| help | |
| Enables run-time debugging support for the ext4 filesystem. | |
| If you select Y here, then you will be able to turn on debugging | |
| with a command such as: | |
| echo 1 > /sys/module/ext4/parameters/mballoc_debug |