WSL2-Linux-Kernel/fs/ubifs/Kconfig

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
	depends on MTD_UBI
	help
	  UBIFS is a file system for flash devices which works on top of UBI.

config UBIFS_FS_ADVANCED_COMPR
	bool "Advanced compression options"
	depends on UBIFS_FS
	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
	depends on UBIFS_FS
	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
	depends on UBIFS_FS
	default y
	help
	  Zlib compresses better than LZO but it is slower. Say 'Y' if unsure.

config UBIFS_ATIME_SUPPORT
	bool "Access time support" if UBIFS_FS
	depends on UBIFS_FS
	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_ENCRYPTION
	bool "UBIFS Encryption"
	depends on UBIFS_FS && BLOCK
	select FS_ENCRYPTION
	default n
	help
	  Enable encryption of UBIFS files and directories. This
	  feature is similar to ecryptfs, but it is more memory
	  efficient since it avoids caching the encrypted and
	  decrypted pages in the page cache.

config UBIFS_FS_SECURITY
	bool "UBIFS Security Labels"
	depends on UBIFS_FS
	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.
UBIFS: include to compilation Add UBIFS to Makefile and Kbuild. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com> Signed-off-by: Adrian Hunter <ext-adrian.hunter@nokia.com> 2008-07-14 20:08:38 +04:00			`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`
			`depends on MTD_UBI`
			`help`
			`UBIFS is a file system for flash devices which works on top of UBI.`

			`config UBIFS_FS_ADVANCED_COMPR`
			`bool "Advanced compression options"`
			`depends on UBIFS_FS`
			`help`
			`This option allows to explicitly choose which compressions, if any,`
trivial: fix typos/grammar errors in Kconfig texts Signed-off-by: Matt LaPlante <kernel1@cyberdogtech.com> Acked-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz> 2009-01-26 13:12:25 +03:00			`are enabled in UBIFS. Removing compressors means inability to read`
UBIFS: include to compilation Add UBIFS to Makefile and Kbuild. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com> Signed-off-by: Adrian Hunter <ext-adrian.hunter@nokia.com> 2008-07-14 20:08:38 +04:00			`existing file systems.`

			`If unsure, say 'N'.`

			`config UBIFS_FS_LZO`
			`bool "LZO compression support" if UBIFS_FS_ADVANCED_COMPR`
			`depends on UBIFS_FS`
			`default y`
			`help`
trivial: fix typos/grammar errors in Kconfig texts Signed-off-by: Matt LaPlante <kernel1@cyberdogtech.com> Acked-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz> 2009-01-26 13:12:25 +03:00			`LZO compressor is generally faster than zlib but compresses worse.`
UBIFS: include to compilation Add UBIFS to Makefile and Kbuild. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com> Signed-off-by: Adrian Hunter <ext-adrian.hunter@nokia.com> 2008-07-14 20:08:38 +04:00			`Say 'Y' if unsure.`

			`config UBIFS_FS_ZLIB`
			`bool "ZLIB compression support" if UBIFS_FS_ADVANCED_COMPR`
			`depends on UBIFS_FS`
			`default y`
			`help`
trivial: fix then -> than typos in comments and documentation - (better, more, bigger ...) then -> (...) than Signed-off-by: Frederik Schwarzer <schwarzerf@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz> 2008-10-16 21:02:37 +04:00			`Zlib compresses better than LZO but it is slower. Say 'Y' if unsure.`
ubifs: introduce UBIFS_ATIME_SUPPORT to ubifs To make ubifs support atime flexily, this commit introduces a Kconfig option named as UBIFS_ATIME_SUPPORT. With UBIFS_ATIME_SUPPORT=n: ubifs keeps the full compatibility to no_atime from the start of ubifs. =================UBIFS_ATIME_SUPPORT=n======================= -o - no atime -o atime - no atime -o noatime - no atime -o relatime - no atime -o strictatime - no atime -o lazyatime - no atime With UBIFS_ATIME_SUPPORT=y: ubifs supports the atime same with other main stream file systems. =================UBIFS_ATIME_SUPPORT=y======================= -o - default behavior (relatime currently) -o atime - atime support -o noatime - no atime support -o relatime - relative atime support -o strictatime - strict atime support -o lazyatime - lazy atime support Signed-off-by: Dongsheng Yang <yangds.fnst@cn.fujitsu.com> Reviewed-by: Richard Weinberger <richard@nod.at> Signed-off-by: Richard Weinberger <richard@nod.at> 2015-11-07 07:46:11 +03:00
			`config UBIFS_ATIME_SUPPORT`
			`bool "Access time support" if UBIFS_FS`
			`depends on UBIFS_FS`
			`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'`
ubifs: Add skeleton for fscrypto This is the first building block to provide file level encryption on UBIFS. Signed-off-by: Richard Weinberger <richard@nod.at> 2016-10-20 17:47:56 +03:00
			`config UBIFS_FS_ENCRYPTION`
			`bool "UBIFS Encryption"`
ubifs: add CONFIG_BLOCK dependency for encryption This came up during the v4.10 merge window: warning: (UBIFS_FS_ENCRYPTION) selects FS_ENCRYPTION which has unmet direct dependencies (BLOCK) fs/crypto/crypto.c: In function 'fscrypt_zeroout_range': fs/crypto/crypto.c:355:9: error: implicit declaration of function 'bio_alloc';did you mean 'd_alloc'? [-Werror=implicit-function-declaration] bio = bio_alloc(GFP_NOWAIT, 1); The easiest way out is to limit UBIFS_FS_ENCRYPTION to configurations that also enable BLOCK. Fixes: d475a507457b ("ubifs: Add skeleton for fscrypto") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Richard Weinberger <richard@nod.at> 2016-12-16 11:42:16 +03:00			`depends on UBIFS_FS && BLOCK`
ubifs: Add skeleton for fscrypto This is the first building block to provide file level encryption on UBIFS. Signed-off-by: Richard Weinberger <richard@nod.at> 2016-10-20 17:47:56 +03:00			`select FS_ENCRYPTION`
			`default n`
			`help`
			`Enable encryption of UBIFS files and directories. This`
			`feature is similar to ecryptfs, but it is more memory`
			`efficient since it avoids caching the encrypted and`
			`decrypted pages in the page cache.`
ubifs: Add CONFIG_UBIFS_FS_SECURITY to disable/enable security labels When write syscall is called, every time security label is searched to determine that file's privileges should be changed. If LSM(Linux Security Model) is not used, this is useless. So introduce CONFIG_UBIFS_SECURITY to disable security labels. it's default value is "y". Signed-off-by: Hyunchul Lee <cheol.lee@lge.com> Signed-off-by: Richard Weinberger <richard@nod.at> 2017-03-03 10:44:03 +03:00
			`config UBIFS_FS_SECURITY`
			`bool "UBIFS Security Labels"`
			`depends on UBIFS_FS`
			`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.`