linux/fs/ext3/Kconfig
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   1config EXT3_FS
   2        tristate "Ext3 journalling file system support"
   3        select JBD
   4        help
   5          This is the journalling version of the Second extended file system
   6          (often called ext3), the de facto standard Linux file system
   7          (method to organize files on a storage device) for hard disks.
   8
   9          The journalling code included in this driver means you do not have
  10          to run e2fsck (file system checker) on your file systems after a
  11          crash.  The journal keeps track of any changes that were being made
  12          at the time the system crashed, and can ensure that your file system
  13          is consistent without the need for a lengthy check.
  14
  15          Other than adding the journal to the file system, the on-disk format
  16          of ext3 is identical to ext2.  It is possible to freely switch
  17          between using the ext3 driver and the ext2 driver, as long as the
  18          file system has been cleanly unmounted, or e2fsck is run on the file
  19          system.
  20
  21          To add a journal on an existing ext2 file system or change the
  22          behavior of ext3 file systems, you can use the tune2fs utility ("man
  23          tune2fs").  To modify attributes of files and directories on ext3
  24          file systems, use chattr ("man chattr").  You need to be using
  25          e2fsprogs version 1.20 or later in order to create ext3 journals
  26          (available at <http://sourceforge.net/projects/e2fsprogs/>).
  27
  28          To compile this file system support as a module, choose M here: the
  29          module will be called ext3.
  30
  31config EXT3_DEFAULTS_TO_ORDERED
  32        bool "Default to 'data=ordered' in ext3"
  33        depends on EXT3_FS
  34        default y
  35        help
  36          The journal mode options for ext3 have different tradeoffs
  37          between when data is guaranteed to be on disk and
  38          performance.  The use of "data=writeback" can cause
  39          unwritten data to appear in files after an system crash or
  40          power failure, which can be a security issue.  However,
  41          "data=ordered" mode can also result in major performance
  42          problems, including seconds-long delays before an fsync()
  43          call returns.  For details, see:
  44
  45          http://ext4.wiki.kernel.org/index.php/Ext3_data_mode_tradeoffs
  46
  47          If you have been historically happy with ext3's performance,
  48          data=ordered mode will be a safe choice and you should
  49          answer 'y' here.  If you understand the reliability and data
  50          privacy issues of data=writeback and are willing to make
  51          that trade off, answer 'n'.
  52
  53config EXT3_FS_XATTR
  54        bool "Ext3 extended attributes"
  55        depends on EXT3_FS
  56        default y
  57        help
  58          Extended attributes are name:value pairs associated with inodes by
  59          the kernel or by users (see the attr(5) manual page, or visit
  60          <http://acl.bestbits.at/> for details).
  61
  62          If unsure, say N.
  63
  64          You need this for POSIX ACL support on ext3.
  65
  66config EXT3_FS_POSIX_ACL
  67        bool "Ext3 POSIX Access Control Lists"
  68        depends on EXT3_FS_XATTR
  69        select FS_POSIX_ACL
  70        help
  71          Posix Access Control Lists (ACLs) support permissions for users and
  72          groups beyond the owner/group/world scheme.
  73
  74          To learn more about Access Control Lists, visit the Posix ACLs for
  75          Linux website <http://acl.bestbits.at/>.
  76
  77          If you don't know what Access Control Lists are, say N
  78
  79config EXT3_FS_SECURITY
  80        bool "Ext3 Security Labels"
  81        depends on EXT3_FS_XATTR
  82        help
  83          Security labels support alternative access control models
  84          implemented by security modules like SELinux.  This option
  85          enables an extended attribute handler for file security
  86          labels in the ext3 filesystem.
  87
  88          If you are not using a security module that requires using
  89          extended attributes for file security labels, say N.
  90
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