1config UBIFS_FS
 2	tristate "UBIFS file system support"
 3	select CRC16
 4	select CRC32
 5	select CRYPTO if UBIFS_FS_ADVANCED_COMPR
 6	select CRYPTO if UBIFS_FS_LZO
 7	select CRYPTO if UBIFS_FS_ZLIB
 
 8	select CRYPTO_LZO if UBIFS_FS_LZO
 9	select CRYPTO_DEFLATE if UBIFS_FS_ZLIB
 
 
 
 
10	depends on MTD_UBI
11	help
12	  UBIFS is a file system for flash devices which works on top of UBI.
13
 
 
14config UBIFS_FS_ADVANCED_COMPR
15	bool "Advanced compression options"
16	depends on UBIFS_FS
17	help
18	  This option allows to explicitly choose which compressions, if any,
19	  are enabled in UBIFS. Removing compressors means inability to read
20	  existing file systems.
21
22	  If unsure, say 'N'.
23
24config UBIFS_FS_LZO
25	bool "LZO compression support" if UBIFS_FS_ADVANCED_COMPR
26	depends on UBIFS_FS
27	default y
28	help
29	   LZO compressor is generally faster than zlib but compresses worse.
30	   Say 'Y' if unsure.
31
32config UBIFS_FS_ZLIB
33	bool "ZLIB compression support" if UBIFS_FS_ADVANCED_COMPR
34	depends on UBIFS_FS
35	default y
36	help
37	  Zlib compresses better than LZO but it is slower. Say 'Y' if unsure.
38
39config UBIFS_ATIME_SUPPORT
40	bool "Access time support" if UBIFS_FS
41	depends on UBIFS_FS
 
 
 
 
 
 
 
42	default n
43	help
44	  Originally UBIFS did not support atime, because it looked like a bad idea due
45	  increased flash wear. This option adds atime support and it is disabled by default
46	  to preserve the old behavior. If you enable this option, UBIFS starts updating atime,
47	  which means that file-system read operations will cause writes (inode atime
48	  updates). This may affect file-system performance and increase flash device wear,
49	  so be careful. How often atime is updated depends on the selected strategy:
50	  strictatime is the "heavy", relatime is "lighter", etc.
51
52	  If unsure, say 'N'

  1# SPDX-License-Identifier: GPL-2.0-only
  2config 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	select FS_ENCRYPTION_ALGS if FS_ENCRYPTION
 16	depends on MTD_UBI
 17	help
 18	  UBIFS is a file system for flash devices which works on top of UBI.
 19
 20if UBIFS_FS
 21
 22config UBIFS_FS_ADVANCED_COMPR
 23	bool "Advanced compression options"
 
 24	help
 25	  This option allows to explicitly choose which compressions, if any,
 26	  are enabled in UBIFS. Removing compressors means inability to read
 27	  existing file systems.
 28
 29	  If unsure, say 'N'.
 30
 31config UBIFS_FS_LZO
 32	bool "LZO compression support" if UBIFS_FS_ADVANCED_COMPR
 
 33	default y
 34	help
 35	   LZO compressor is generally faster than zlib but compresses worse.
 36	   Say 'Y' if unsure.
 37
 38config UBIFS_FS_ZLIB
 39	bool "ZLIB compression support" if UBIFS_FS_ADVANCED_COMPR
 
 40	default y
 41	help
 42	  Zlib compresses better than LZO but it is slower. Say 'Y' if unsure.
 43
 44config UBIFS_FS_ZSTD
 45	bool "ZSTD compression support" if UBIFS_FS_ADVANCED_COMPR
 46	depends on UBIFS_FS
 47	default y
 48	help
 49	  ZSTD compresses is a big win in speed over Zlib and
 50	  in compression ratio over LZO. Say 'Y' if unsure.
 51
 52config UBIFS_ATIME_SUPPORT
 53	bool "Access time support"
 54	default n
 55	help
 56	  Originally UBIFS did not support atime, because it looked like a bad idea due
 57	  increased flash wear. This option adds atime support and it is disabled by default
 58	  to preserve the old behavior. If you enable this option, UBIFS starts updating atime,
 59	  which means that file-system read operations will cause writes (inode atime
 60	  updates). This may affect file-system performance and increase flash device wear,
 61	  so be careful. How often atime is updated depends on the selected strategy:
 62	  strictatime is the "heavy", relatime is "lighter", etc.
 63
 64	  If unsure, say 'N'
 65
 66config UBIFS_FS_XATTR
 67	bool "UBIFS XATTR support"
 68	default y
 69	help
 70	  Saying Y here includes support for extended attributes (xattrs).
 71	  Xattrs are name:value pairs associated with inodes by
 72	  the kernel or by users (see the attr(5) manual page).
 73
 74	  If unsure, say Y.
 75
 76config UBIFS_FS_SECURITY
 77	bool "UBIFS Security Labels"
 78	depends on UBIFS_FS_XATTR
 79	default y
 80	help
 81	  Security labels provide an access control facility to support Linux
 82	  Security Models (LSMs) accepted by AppArmor, SELinux, Smack and TOMOYO
 83	  Linux. This option enables an extended attribute handler for file
 84	  security labels in the ubifs filesystem, so that it requires enabling
 85	  the extended attribute support in advance.
 86
 87	  If you are not using a security module, say N.
 88
 89config UBIFS_FS_AUTHENTICATION
 90	bool "UBIFS authentication support"
 91	select KEYS
 92	select CRYPTO_HMAC
 93	select SYSTEM_DATA_VERIFICATION
 94	help
 95	  Enable authentication support for UBIFS. This feature offers protection
 96	  against offline changes for both data and metadata of the filesystem.
 97	  If you say yes here you should also select a hashing algorithm such as
 98	  sha256, these are not selected automatically since there are many
 99	  different options.
100
101endif # UBIFS_FS