[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_LZO if UBIFS_FS_LZO
	select CRYPTO_DEFLATE if UBIFS_FS_ZLIB
	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_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
	9	select CRYPTO_LZO if UBIFS_FS_LZO
	10	select CRYPTO_DEFLATE if UBIFS_FS_ZLIB
49525e5e	11	select CRYPTO_HASH_INFO
643fa961	12	select UBIFS_FS_XATTR if FS_ENCRYPTION
0d7eff87 AB	13	depends on MTD_UBI
	14	help
	15	UBIFS is a file system for flash devices which works on top of UBI.
	16
aa3d31e0 GU	17	if UBIFS_FS
aa3d31e0 GU	18
0d7eff87 AB	19	config UBIFS_FS_ADVANCED_COMPR
0d7eff87 AB	20	bool "Advanced compression options"
0d7eff87 AB	21	help
0d7eff87 AB	22	This option allows to explicitly choose which compressions, if any,
692105b8	23	are enabled in UBIFS. Removing compressors means inability to read
0d7eff87 AB	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
0d7eff87 AB	30	default y
0d7eff87 AB	31	help
692105b8	32	LZO compressor is generally faster than zlib but compresses worse.
0d7eff87 AB	33	Say 'Y' if unsure.
	34
	35	config UBIFS_FS_ZLIB
	36	bool "ZLIB compression support" if UBIFS_FS_ADVANCED_COMPR
0d7eff87 AB	37	default y
0d7eff87 AB	38	help
025dfdaf	39	Zlib compresses better than LZO but it is slower. Say 'Y' if unsure.
8c1c5f26 DY	40
8c1c5f26 DY	41	config UBIFS_ATIME_SUPPORT
aa3d31e0	42	bool "Access time support"
8c1c5f26 DY	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'
d475a507	54
7e5471ce SA	55	config UBIFS_FS_XATTR
7e5471ce SA	56	bool "UBIFS XATTR support"
7e5471ce SA	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
8326c1ee HL	65	config UBIFS_FS_SECURITY
8326c1ee HL	66	bool "UBIFS Security Labels"
aa3d31e0	67	depends on UBIFS_FS_XATTR
8326c1ee HL	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.
d8a22773 SH	77
	78	config UBIFS_FS_AUTHENTICATION
	79	bool "UBIFS authentication support"
817aa094	80	select KEYS
d8a22773	81	select CRYPTO_HMAC
817aa094	82	select SYSTEM_DATA_VERIFICATION
d8a22773 SH	83	help
	84	Enable authentication support for UBIFS. This feature offers protection
	85	against offline changes for both data and metadata of the filesystem.
	86	If you say yes here you should also select a hashing algorithm such as
	87	sha256, these are not selected automatically since there are many
	88	different options.
aa3d31e0 GU	89
aa3d31e0 GU	90	endif # UBIFS_FS