[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
	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
0d7eff87 AB	15	depends on MTD_UBI
	16	help
	17	UBIFS is a file system for flash devices which works on top of UBI.
	18
aa3d31e0 GU	19	if UBIFS_FS
aa3d31e0 GU	20
0d7eff87 AB	21	config UBIFS_FS_ADVANCED_COMPR
0d7eff87 AB	22	bool "Advanced compression options"
0d7eff87 AB	23	help
0d7eff87 AB	24	This option allows to explicitly choose which compressions, if any,
692105b8	25	are enabled in UBIFS. Removing compressors means inability to read
0d7eff87 AB	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
0d7eff87 AB	32	default y
0d7eff87 AB	33	help
692105b8	34	LZO compressor is generally faster than zlib but compresses worse.
0d7eff87 AB	35	Say 'Y' if unsure.
	36
	37	config UBIFS_FS_ZLIB
	38	bool "ZLIB compression support" if UBIFS_FS_ADVANCED_COMPR
0d7eff87 AB	39	default y
0d7eff87 AB	40	help
025dfdaf	41	Zlib compresses better than LZO but it is slower. Say 'Y' if unsure.
8c1c5f26	42
eeabb986 MD	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
8c1c5f26	51	config UBIFS_ATIME_SUPPORT
aa3d31e0	52	bool "Access time support"
8c1c5f26 DY	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'
d475a507	64
7e5471ce SA	65	config UBIFS_FS_XATTR
7e5471ce SA	66	bool "UBIFS XATTR support"
7e5471ce SA	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
8326c1ee HL	75	config UBIFS_FS_SECURITY
8326c1ee HL	76	bool "UBIFS Security Labels"
aa3d31e0	77	depends on UBIFS_FS_XATTR
8326c1ee HL	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.
d8a22773 SH	87
	88	config UBIFS_FS_AUTHENTICATION
	89	bool "UBIFS authentication support"
817aa094	90	select KEYS
d8a22773	91	select CRYPTO_HMAC
817aa094	92	select SYSTEM_DATA_VERIFICATION
d8a22773 SH	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.
aa3d31e0 GU	99
aa3d31e0 GU	100	endif # UBIFS_FS