| config EXT4_FS | |
| tristate "The Extended 4 (ext4) filesystem" | |
| select JBD2 | |
| select CRC16 | |
| select CRYPTO | |
| select CRYPTO_CRC32C | |
| 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 will support mounting an ext3 | |
| filesystem; while there will be some performance gains from | |
| the delayed allocation and inode table readahead, the best | |
| performance gains will require enabling ext4 features in the | |
| filesystem, or formatting a new filesystem as an ext4 | |
| filesystem initially. | |
| 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_EXT23 | |
| bool "Use ext4 for ext2/ext3 file systems" | |
| depends on EXT4_FS | |
| depends on EXT3_FS=n || EXT2_FS=n | |
| default y | |
| help | |
| Allow the ext4 file system driver code to be used for ext2 or | |
| ext3 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. | |
| To learn more about Access Control Lists, visit the POSIX ACLs for | |
| Linux website <http://acl.bestbits.at/>. | |
| 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_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 |