LXR linux/fs/ext4/Kconfig

   1config EXT4_FS
   2        tristate "The Extended 4 (ext4) filesystem"
   3        select JBD2
   4        select CRC16
   5        select CRYPTO
   6        select CRYPTO_CRC32C
   7        help
   8          This is the next generation of the ext3 filesystem.
   9
  10          Unlike the change from ext2 filesystem to ext3 filesystem,
  11          the on-disk format of ext4 is not forwards compatible with
  12          ext3; it is based on extent maps and it supports 48-bit
  13          physical block numbers.  The ext4 filesystem also supports delayed
  14          allocation, persistent preallocation, high resolution time stamps,
  15          and a number of other features to improve performance and speed
  16          up fsck time.  For more information, please see the web pages at
  17          http://ext4.wiki.kernel.org.
  18
  19          The ext4 filesystem will support mounting an ext3
  20          filesystem; while there will be some performance gains from
  21          the delayed allocation and inode table readahead, the best
  22          performance gains will require enabling ext4 features in the
  23          filesystem, or formatting a new filesystem as an ext4
  24          filesystem initially.
  25
  26          To compile this file system support as a module, choose M here. The
  27          module will be called ext4.
  28
  29          If unsure, say N.
  30
  31config EXT4_USE_FOR_EXT23
  32        bool "Use ext4 for ext2/ext3 file systems"
  33        depends on EXT4_FS
  34        depends on EXT3_FS=n || EXT2_FS=n
  35        default y
  36        help
  37          Allow the ext4 file system driver code to be used for ext2 or
  38          ext3 file system mounts.  This allows users to reduce their
  39          compiled kernel size by using one file system driver for
  40          ext2, ext3, and ext4 file systems.
  41
  42config EXT4_FS_POSIX_ACL
  43        bool "Ext4 POSIX Access Control Lists"
  44        depends on EXT4_FS
  45        select FS_POSIX_ACL
  46        help
  47          POSIX Access Control Lists (ACLs) support permissions for users and
  48          groups beyond the owner/group/world scheme.
  49
  50          To learn more about Access Control Lists, visit the POSIX ACLs for
  51          Linux website <http://acl.bestbits.at/>.
  52
  53          If you don't know what Access Control Lists are, say N
  54
  55config EXT4_FS_SECURITY
  56        bool "Ext4 Security Labels"
  57        depends on EXT4_FS
  58        help
  59          Security labels support alternative access control models
  60          implemented by security modules like SELinux.  This option
  61          enables an extended attribute handler for file security
  62          labels in the ext4 filesystem.
  63
  64          If you are not using a security module that requires using
  65          extended attributes for file security labels, say N.
  66
  67config EXT4_DEBUG
  68        bool "EXT4 debugging support"
  69        depends on EXT4_FS
  70        help
  71          Enables run-time debugging support for the ext4 filesystem.
  72
  73          If you select Y here, then you will be able to turn on debugging
  74          with a command such as:
  75                echo 1 > /sys/module/ext4/parameters/mballoc_debug
  76