fs/ubifs/Kconfig

   1 # SPDX-License-Identifier: GPL-2.0-only
   2 config UBIFS_FS
   3         tristate "UBIFS file system support"
   4         select CRC16
   5         select CRC32
   6         select CRYPTO if UBIFS_FS_ADVANCED_COMPR
   7         select CRYPTO if UBIFS_FS_LZO
   8         select CRYPTO if UBIFS_FS_ZLIB
   9         select CRYPTO_LZO if UBIFS_FS_LZO
  10         select CRYPTO_DEFLATE if UBIFS_FS_ZLIB
  11         select CRYPTO_HASH_INFO
  12         select UBIFS_FS_XATTR if FS_ENCRYPTION
  13         depends on MTD_UBI
  14         help
  15           UBIFS is a file system for flash devices which works on top of UBI.
  16
  17 if UBIFS_FS
  18
  19 config UBIFS_FS_ADVANCED_COMPR
  20         bool "Advanced compression options"
  21         help
  22           This option allows to explicitly choose which compressions, if any,
  23           are enabled in UBIFS. Removing compressors means inability to read
  24           existing file systems.
  25
  26           If unsure, say 'N'.
  27
  28 config UBIFS_FS_LZO
  29         bool "LZO compression support" if UBIFS_FS_ADVANCED_COMPR
  30         default y
  31         help
  32            LZO compressor is generally faster than zlib but compresses worse.
  33            Say 'Y' if unsure.
  34
  35 config UBIFS_FS_ZLIB
  36         bool "ZLIB compression support" if UBIFS_FS_ADVANCED_COMPR
  37         default y
  38         help
  39           Zlib compresses better than LZO but it is slower. Say 'Y' if unsure.
  40
  41 config UBIFS_ATIME_SUPPORT
  42         bool "Access time support"
  43         default n
  44         help
  45           Originally UBIFS did not support atime, because it looked like a bad idea due
  46           increased flash wear. This option adds atime support and it is disabled by default
  47           to preserve the old behavior. If you enable this option, UBIFS starts updating atime,
  48           which means that file-system read operations will cause writes (inode atime
  49           updates). This may affect file-system performance and increase flash device wear,
  50           so be careful. How often atime is updated depends on the selected strategy:
  51           strictatime is the "heavy", relatime is "lighter", etc.
  52
  53           If unsure, say 'N'
  54
  55 config UBIFS_FS_XATTR
  56         bool "UBIFS XATTR support"
  57         default y
  58         help
  59           Saying Y here includes support for extended attributes (xattrs).
  60           Xattrs are name:value pairs associated with inodes by
  61           the kernel or by users (see the attr(5) manual page).
  62
  63           If unsure, say Y.
  64
  65 config UBIFS_FS_SECURITY
  66         bool "UBIFS Security Labels"
  67         depends on UBIFS_FS_XATTR
  68         default y
  69         help
  70           Security labels provide an access control facility to support Linux
  71           Security Models (LSMs) accepted by AppArmor, SELinux, Smack and TOMOYO
  72           Linux. This option enables an extended attribute handler for file
  73           security labels in the ubifs filesystem, so that it requires enabling
  74           the extended attribute support in advance.
  75
  76           If you are not using a security module, say N.
  77
  78 config UBIFS_FS_AUTHENTICATION
  79         bool "UBIFS authentication support"
  80         depends on KEYS
  81         select CRYPTO_HMAC
  82         help
  83           Enable authentication support for UBIFS. This feature offers protection
  84           against offline changes for both data and metadata of the filesystem.
  85           If you say yes here you should also select a hashing algorithm such as
  86           sha256, these are not selected automatically since there are many
  87           different options.
  88
  89 endif # UBIFS_FS