config EXT4_FS
  	tristate "The Extended 4 (ext4) filesystem"
  	select JBD2
  	select CRC16
  	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_XATTR
  	bool "Ext4 extended attributes"
  	depends on EXT4_FS
  	default y
  	help
  	  Extended attributes are name:value pairs associated with inodes by
  	  the kernel or by users (see the attr(5) manual page, or visit
  	  <http://acl.bestbits.at/> for details).
  
  	  If unsure, say N.
  
  	  You need this for POSIX ACL support on ext4.
  
  config EXT4_FS_POSIX_ACL
  	bool "Ext4 POSIX Access Control Lists"
  	depends on EXT4_FS_XATTR
  	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_XATTR
  	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/kernel/debug/ext4/mballoc-debug"