[linux-2.6-block.git] / fs / ubifs / Kconfig

# SPDX-License-Identifier: GPL-2.0-only
config UBIFS_FS
	tristate "UBIFS file system support"
	select CRC16
	select CRC32
	select CRYPTO if UBIFS_FS_ADVANCED_COMPR
	select CRYPTO if UBIFS_FS_LZO
	select CRYPTO if UBIFS_FS_ZLIB
	select CRYPTO if UBIFS_FS_ZSTD
	select CRYPTO_LZO if UBIFS_FS_LZO
	select CRYPTO_DEFLATE if UBIFS_FS_ZLIB
	select CRYPTO_ZSTD if UBIFS_FS_ZSTD
	select CRYPTO_HASH_INFO
	select UBIFS_FS_XATTR if FS_ENCRYPTION
	select FS_ENCRYPTION_ALGS if FS_ENCRYPTION
	depends on MTD_UBI
	help
	  UBIFS is a file system for flash devices which works on top of UBI.

if UBIFS_FS

config UBIFS_FS_ADVANCED_COMPR
	bool "Advanced compression options"
	help
	  This option allows to explicitly choose which compressions, if any,
	  are enabled in UBIFS. Removing compressors means inability to read
	  existing file systems.

	  If unsure, say 'N'.

config UBIFS_FS_LZO
	bool "LZO compression support" if UBIFS_FS_ADVANCED_COMPR
	default y
	help
	   LZO compressor is generally faster than zlib but compresses worse.
	   Say 'Y' if unsure.

config UBIFS_FS_ZLIB
	bool "ZLIB compression support" if UBIFS_FS_ADVANCED_COMPR
	default y
	help
	  Zlib compresses better than LZO but it is slower. Say 'Y' if unsure.

config UBIFS_FS_ZSTD
	bool "ZSTD compression support" if UBIFS_FS_ADVANCED_COMPR
	depends on UBIFS_FS
	default y
	help
	  ZSTD compresses is a big win in speed over Zlib and
	  in compression ratio over LZO. Say 'Y' if unsure.

config UBIFS_ATIME_SUPPORT
	bool "Access time support"
	default n
	help
	  Originally UBIFS did not support atime, because it looked like a bad idea due
	  increased flash wear. This option adds atime support and it is disabled by default
	  to preserve the old behavior. If you enable this option, UBIFS starts updating atime,
	  which means that file-system read operations will cause writes (inode atime
	  updates). This may affect file-system performance and increase flash device wear,
	  so be careful. How often atime is updated depends on the selected strategy:
	  strictatime is the "heavy", relatime is "lighter", etc.

	  If unsure, say 'N'

config UBIFS_FS_XATTR
	bool "UBIFS XATTR support"
	default y
	help
	  Saying Y here includes support for extended attributes (xattrs).
	  Xattrs are name:value pairs associated with inodes by
	  the kernel or by users (see the attr(5) manual page).

	  If unsure, say Y.

config UBIFS_FS_SECURITY
	bool "UBIFS Security Labels"
	depends on UBIFS_FS_XATTR
	default y
	help
	  Security labels provide an access control facility to support Linux
	  Security Models (LSMs) accepted by AppArmor, SELinux, Smack and TOMOYO
	  Linux. This option enables an extended attribute handler for file
	  security labels in the ubifs filesystem, so that it requires enabling
	  the extended attribute support in advance.

	  If you are not using a security module, say N.

config UBIFS_FS_AUTHENTICATION
	bool "UBIFS authentication support"
	select KEYS
	select CRYPTO_HMAC
	select SYSTEM_DATA_VERIFICATION
	help
	  Enable authentication support for UBIFS. This feature offers protection
	  against offline changes for both data and metadata of the filesystem.
	  If you say yes here you should also select a hashing algorithm such as
	  sha256, these are not selected automatically since there are many
	  different options.

endif # UBIFS_FS
Commit	Line	Data
ec8f24b7	1	# SPDX-License-Identifier: GPL-2.0-only
0d7eff87 AB	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
eeabb986	9	select CRYPTO if UBIFS_FS_ZSTD
0d7eff87 AB	10	select CRYPTO_LZO if UBIFS_FS_LZO
0d7eff87 AB	11	select CRYPTO_DEFLATE if UBIFS_FS_ZLIB
eeabb986	12	select CRYPTO_ZSTD if UBIFS_FS_ZSTD
49525e5e	13	select CRYPTO_HASH_INFO
643fa961	14	select UBIFS_FS_XATTR if FS_ENCRYPTION
ede7a09f	15	select FS_ENCRYPTION_ALGS if FS_ENCRYPTION
0d7eff87 AB	16	depends on MTD_UBI
	17	help
	18	UBIFS is a file system for flash devices which works on top of UBI.
	19
aa3d31e0 GU	20	if UBIFS_FS
aa3d31e0 GU	21
0d7eff87 AB	22	config UBIFS_FS_ADVANCED_COMPR
0d7eff87 AB	23	bool "Advanced compression options"
0d7eff87 AB	24	help
0d7eff87 AB	25	This option allows to explicitly choose which compressions, if any,
692105b8	26	are enabled in UBIFS. Removing compressors means inability to read
0d7eff87 AB	27	existing file systems.
	28
	29	If unsure, say 'N'.
	30
	31	config UBIFS_FS_LZO
	32	bool "LZO compression support" if UBIFS_FS_ADVANCED_COMPR
0d7eff87 AB	33	default y
0d7eff87 AB	34	help
692105b8	35	LZO compressor is generally faster than zlib but compresses worse.
0d7eff87 AB	36	Say 'Y' if unsure.
	37
	38	config UBIFS_FS_ZLIB
	39	bool "ZLIB compression support" if UBIFS_FS_ADVANCED_COMPR
0d7eff87 AB	40	default y
0d7eff87 AB	41	help
025dfdaf	42	Zlib compresses better than LZO but it is slower. Say 'Y' if unsure.
8c1c5f26	43
eeabb986 MD	44	config 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
8c1c5f26	52	config UBIFS_ATIME_SUPPORT
aa3d31e0	53	bool "Access time support"
8c1c5f26 DY	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'
d475a507	65
7e5471ce SA	66	config UBIFS_FS_XATTR
7e5471ce SA	67	bool "UBIFS XATTR support"
7e5471ce SA	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
8326c1ee HL	76	config UBIFS_FS_SECURITY
8326c1ee HL	77	bool "UBIFS Security Labels"
aa3d31e0	78	depends on UBIFS_FS_XATTR
8326c1ee HL	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.
d8a22773 SH	88
	89	config UBIFS_FS_AUTHENTICATION
	90	bool "UBIFS authentication support"
817aa094	91	select KEYS
d8a22773	92	select CRYPTO_HMAC
817aa094	93	select SYSTEM_DATA_VERIFICATION
d8a22773 SH	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.
aa3d31e0 GU	100
aa3d31e0 GU	101	endif # UBIFS_FS