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 if UBIFS_FS_ZSTD
  10         select CRYPTO_LZO if UBIFS_FS_LZO
  11         select CRYPTO_DEFLATE if UBIFS_FS_ZLIB
  12         select CRYPTO_ZSTD if UBIFS_FS_ZSTD
  13         select CRYPTO_HASH_INFO
  14         select UBIFS_FS_XATTR if FS_ENCRYPTION
  15         depends on MTD_UBI
  16         help
  17           UBIFS is a file system for flash devices which works on top of UBI.
  18
  19 if UBIFS_FS
  20
  21 config UBIFS_FS_ADVANCED_COMPR
  22         bool "Advanced compression options"
  23         help
  24           This option allows to explicitly choose which compressions, if any,
  25           are enabled in UBIFS. Removing compressors means inability to read
  26           existing file systems.
  27
  28           If unsure, say 'N'.
  29
  30 config UBIFS_FS_LZO
  31         bool "LZO compression support" if UBIFS_FS_ADVANCED_COMPR
  32         default y
  33         help
  34            LZO compressor is generally faster than zlib but compresses worse.
  35            Say 'Y' if unsure.
  36
  37 config UBIFS_FS_ZLIB
  38         bool "ZLIB compression support" if UBIFS_FS_ADVANCED_COMPR
  39         default y
  40         help
  41           Zlib compresses better than LZO but it is slower. Say 'Y' if unsure.
  42
  43 config UBIFS_FS_ZSTD
  44         bool "ZSTD compression support" if UBIFS_FS_ADVANCED_COMPR
  45         depends on UBIFS_FS
  46         default y
  47         help
  48           ZSTD compresses is a big win in speed over Zlib and
  49           in compression ratio over LZO. Say 'Y' if unsure.
  50
  51 config UBIFS_ATIME_SUPPORT
  52         bool "Access time support"
  53         default n
  54         help
  55           Originally UBIFS did not support atime, because it looked like a bad idea due
  56           increased flash wear. This option adds atime support and it is disabled by default
  57           to preserve the old behavior. If you enable this option, UBIFS starts updating atime,
  58           which means that file-system read operations will cause writes (inode atime
  59           updates). This may affect file-system performance and increase flash device wear,
  60           so be careful. How often atime is updated depends on the selected strategy:
  61           strictatime is the "heavy", relatime is "lighter", etc.
  62
  63           If unsure, say 'N'
  64
  65 config UBIFS_FS_XATTR
  66         bool "UBIFS XATTR support"
  67         default y
  68         help
  69           Saying Y here includes support for extended attributes (xattrs).
  70           Xattrs are name:value pairs associated with inodes by
  71           the kernel or by users (see the attr(5) manual page).
  72
  73           If unsure, say Y.
  74
  75 config UBIFS_FS_SECURITY
  76         bool "UBIFS Security Labels"
  77         depends on UBIFS_FS_XATTR
  78         default y
  79         help
  80           Security labels provide an access control facility to support Linux
  81           Security Models (LSMs) accepted by AppArmor, SELinux, Smack and TOMOYO
  82           Linux. This option enables an extended attribute handler for file
  83           security labels in the ubifs filesystem, so that it requires enabling
  84           the extended attribute support in advance.
  85
  86           If you are not using a security module, say N.
  87
  88 config UBIFS_FS_AUTHENTICATION
  89         bool "UBIFS authentication support"
  90         select KEYS
  91         select CRYPTO_HMAC
  92         select SYSTEM_DATA_VERIFICATION
  93         help
  94           Enable authentication support for UBIFS. This feature offers protection
  95           against offline changes for both data and metadata of the filesystem.
  96           If you say yes here you should also select a hashing algorithm such as
  97           sha256, these are not selected automatically since there are many
  98           different options.
  99
 100 endif # UBIFS_FS