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- 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_XATTR
- bool "UBIFS XATTR support"
- depends on UBIFS_FS
- 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_ENCRYPTION
- bool "UBIFS Encryption"
- depends on UBIFS_FS && UBIFS_FS_XATTR && 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 && 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.
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