1config UBIFS_FS 2 tristate "UBIFS file system support" 3 select CRC16 4 select CRC32 5 select CRYPTO if UBIFS_FS_ADVANCED_COMPR 6 select CRYPTO if UBIFS_FS_LZO 7 select CRYPTO if UBIFS_FS_ZLIB 8 select CRYPTO_LZO if UBIFS_FS_LZO 9 select CRYPTO_DEFLATE if UBIFS_FS_ZLIB 10 select CRYPTO_HASH_INFO 11 select UBIFS_FS_XATTR if FS_ENCRYPTION 12 depends on MTD_UBI 13 help 14 UBIFS is a file system for flash devices which works on top of UBI. 15 16if UBIFS_FS 17 18config UBIFS_FS_ADVANCED_COMPR 19 bool "Advanced compression options" 20 help 21 This option allows to explicitly choose which compressions, if any, 22 are enabled in UBIFS. Removing compressors means inability to read 23 existing file systems. 24 25 If unsure, say 'N'. 26 27config UBIFS_FS_LZO 28 bool "LZO compression support" if UBIFS_FS_ADVANCED_COMPR 29 default y 30 help 31 LZO compressor is generally faster than zlib but compresses worse. 32 Say 'Y' if unsure. 33 34config UBIFS_FS_ZLIB 35 bool "ZLIB compression support" if UBIFS_FS_ADVANCED_COMPR 36 default y 37 help 38 Zlib compresses better than LZO but it is slower. Say 'Y' if unsure. 39 40config UBIFS_ATIME_SUPPORT 41 bool "Access time support" 42 default n 43 help 44 Originally UBIFS did not support atime, because it looked like a bad idea due 45 increased flash wear. This option adds atime support and it is disabled by default 46 to preserve the old behavior. If you enable this option, UBIFS starts updating atime, 47 which means that file-system read operations will cause writes (inode atime 48 updates). This may affect file-system performance and increase flash device wear, 49 so be careful. How often atime is updated depends on the selected strategy: 50 strictatime is the "heavy", relatime is "lighter", etc. 51 52 If unsure, say 'N' 53 54config UBIFS_FS_XATTR 55 bool "UBIFS XATTR support" 56 default y 57 help 58 Saying Y here includes support for extended attributes (xattrs). 59 Xattrs are name:value pairs associated with inodes by 60 the kernel or by users (see the attr(5) manual page). 61 62 If unsure, say Y. 63 64config UBIFS_FS_SECURITY 65 bool "UBIFS Security Labels" 66 depends on UBIFS_FS_XATTR 67 default y 68 help 69 Security labels provide an access control facility to support Linux 70 Security Models (LSMs) accepted by AppArmor, SELinux, Smack and TOMOYO 71 Linux. This option enables an extended attribute handler for file 72 security labels in the ubifs filesystem, so that it requires enabling 73 the extended attribute support in advance. 74 75 If you are not using a security module, say N. 76 77config UBIFS_FS_AUTHENTICATION 78 bool "UBIFS authentication support" 79 depends on KEYS 80 select CRYPTO_HMAC 81 help 82 Enable authentication support for UBIFS. This feature offers protection 83 against offline changes for both data and metadata of the filesystem. 84 If you say yes here you should also select a hashing algorithm such as 85 sha256, these are not selected automatically since there are many 86 different options. 87 88endif # UBIFS_FS 89