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 depends on MTD_UBI 12 help 13 UBIFS is a file system for flash devices which works on top of UBI. 14 15if UBIFS_FS 16 17config UBIFS_FS_ADVANCED_COMPR 18 bool "Advanced compression options" 19 help 20 This option allows to explicitly choose which compressions, if any, 21 are enabled in UBIFS. Removing compressors means inability to read 22 existing file systems. 23 24 If unsure, say 'N'. 25 26config UBIFS_FS_LZO 27 bool "LZO compression support" if UBIFS_FS_ADVANCED_COMPR 28 default y 29 help 30 LZO compressor is generally faster than zlib but compresses worse. 31 Say 'Y' if unsure. 32 33config UBIFS_FS_ZLIB 34 bool "ZLIB compression support" if UBIFS_FS_ADVANCED_COMPR 35 default y 36 help 37 Zlib compresses better than LZO but it is slower. Say 'Y' if unsure. 38 39config UBIFS_ATIME_SUPPORT 40 bool "Access time support" 41 default n 42 help 43 Originally UBIFS did not support atime, because it looked like a bad idea due 44 increased flash wear. This option adds atime support and it is disabled by default 45 to preserve the old behavior. If you enable this option, UBIFS starts updating atime, 46 which means that file-system read operations will cause writes (inode atime 47 updates). This may affect file-system performance and increase flash device wear, 48 so be careful. How often atime is updated depends on the selected strategy: 49 strictatime is the "heavy", relatime is "lighter", etc. 50 51 If unsure, say 'N' 52 53config UBIFS_FS_XATTR 54 bool "UBIFS XATTR support" 55 default y 56 help 57 Saying Y here includes support for extended attributes (xattrs). 58 Xattrs are name:value pairs associated with inodes by 59 the kernel or by users (see the attr(5) manual page). 60 61 If unsure, say Y. 62 63config UBIFS_FS_ENCRYPTION 64 bool "UBIFS Encryption" 65 depends on UBIFS_FS_XATTR && BLOCK 66 select FS_ENCRYPTION 67 default n 68 help 69 Enable encryption of UBIFS files and directories. This 70 feature is similar to ecryptfs, but it is more memory 71 efficient since it avoids caching the encrypted and 72 decrypted pages in the page cache. 73 74config UBIFS_FS_SECURITY 75 bool "UBIFS Security Labels" 76 depends on UBIFS_FS_XATTR 77 default y 78 help 79 Security labels provide an access control facility to support Linux 80 Security Models (LSMs) accepted by AppArmor, SELinux, Smack and TOMOYO 81 Linux. This option enables an extended attribute handler for file 82 security labels in the ubifs filesystem, so that it requires enabling 83 the extended attribute support in advance. 84 85 If you are not using a security module, say N. 86 87config UBIFS_FS_AUTHENTICATION 88 bool "UBIFS authentication support" 89 depends on KEYS 90 select CRYPTO_HMAC 91 help 92 Enable authentication support for UBIFS. This feature offers protection 93 against offline changes for both data and metadata of the filesystem. 94 If you say yes here you should also select a hashing algorithm such as 95 sha256, these are not selected automatically since there are many 96 different options. 97 98endif # UBIFS_FS 99