LXR linux/fs/ext4/Kconfig

   1config EXT4_FS
   2        tristate "The Extended 4 (ext4) filesystem"
   3        select JBD2
   4        select CRC16
   5        help
   6          This is the next generation of the ext3 filesystem.
   7
   8          Unlike the change from ext2 filesystem to ext3 filesystem,
   9          the on-disk format of ext4 is not forwards compatible with
  10          ext3; it is based on extent maps and it supports 48-bit
  11          physical block numbers.  The ext4 filesystem also supports delayed
  12          allocation, persistent preallocation, high resolution time stamps,
  13          and a number of other features to improve performance and speed
  14          up fsck time.  For more information, please see the web pages at
  15          http://ext4.wiki.kernel.org.
  16
  17          The ext4 filesystem will support mounting an ext3
  18          filesystem; while there will be some performance gains from
  19          the delayed allocation and inode table readahead, the best
  20          performance gains will require enabling ext4 features in the
  21          filesystem, or formatting a new filesystem as an ext4
  22          filesystem initially.
  23
  24          To compile this file system support as a module, choose M here. The
  25          module will be called ext4.
  26
  27          If unsure, say N.
  28
  29config EXT4_USE_FOR_EXT23
  30        bool "Use ext4 for ext2/ext3 file systems"
  31        depends on EXT4_FS
  32        depends on EXT3_FS=n || EXT2_FS=n
  33        default y
  34        help
  35          Allow the ext4 file system driver code to be used for ext2 or
  36          ext3 file system mounts.  This allows users to reduce their
  37          compiled kernel size by using one file system driver for
  38          ext2, ext3, and ext4 file systems.
  39
  40config EXT4_FS_XATTR
  41        bool "Ext4 extended attributes"
  42        depends on EXT4_FS
  43        default y
  44        help
  45          Extended attributes are name:value pairs associated with inodes by
  46          the kernel or by users (see the attr(5) manual page, or visit
  47          <http://acl.bestbits.at/> for details).
  48
  49          If unsure, say N.
  50
  51          You need this for POSIX ACL support on ext4.
  52
  53config EXT4_FS_POSIX_ACL
  54        bool "Ext4 POSIX Access Control Lists"
  55        depends on EXT4_FS_XATTR
  56        select FS_POSIX_ACL
  57        help
  58          POSIX Access Control Lists (ACLs) support permissions for users and
  59          groups beyond the owner/group/world scheme.
  60
  61          To learn more about Access Control Lists, visit the POSIX ACLs for
  62          Linux website <http://acl.bestbits.at/>.
  63
  64          If you don't know what Access Control Lists are, say N
  65
  66config EXT4_FS_SECURITY
  67        bool "Ext4 Security Labels"
  68        depends on EXT4_FS_XATTR
  69        help
  70          Security labels support alternative access control models
  71          implemented by security modules like SELinux.  This option
  72          enables an extended attribute handler for file security
  73          labels in the ext4 filesystem.
  74
  75          If you are not using a security module that requires using
  76          extended attributes for file security labels, say N.
  77
  78config EXT4_DEBUG
  79        bool "EXT4 debugging support"
  80        depends on EXT4_FS
  81        help
  82          Enables run-time debugging support for the ext4 filesystem.
  83
  84          If you select Y here, then you will be able to turn on debugging
  85          with a command such as "echo 1 > /sys/kernel/debug/ext4/mballoc-debug"
  86