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TOMOYO Linux Cross Reference
Linux/fs/ext4/Kconfig

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  1 config 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 
 31 config 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 
 42 config 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 
 55 config 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 
 67 config 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

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