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 depends on MTD_UBI 11 help 12 UBIFS is a file system for flash devices which works on top of UBI. 13 14config UBIFS_FS_ADVANCED_COMPR 15 bool "Advanced compression options" 16 depends on UBIFS_FS 17 help 18 This option allows to explicitly choose which compressions, if any, 19 are enabled in UBIFS. Removing compressors means inability to read 20 existing file systems. 21 22 If unsure, say 'N'. 23 24config UBIFS_FS_LZO 25 bool "LZO compression support" if UBIFS_FS_ADVANCED_COMPR 26 depends on UBIFS_FS 27 default y 28 help 29 LZO compressor is generally faster than zlib but compresses worse. 30 Say 'Y' if unsure. 31 32config UBIFS_FS_ZLIB 33 bool "ZLIB compression support" if UBIFS_FS_ADVANCED_COMPR 34 depends on UBIFS_FS 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" if UBIFS_FS 41 depends on UBIFS_FS 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 depends on UBIFS_FS 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 65config UBIFS_FS_ENCRYPTION 66 bool "UBIFS Encryption" 67 depends on UBIFS_FS && UBIFS_FS_XATTR && BLOCK 68 select FS_ENCRYPTION 69 default n 70 help 71 Enable encryption of UBIFS files and directories. This 72 feature is similar to ecryptfs, but it is more memory 73 efficient since it avoids caching the encrypted and 74 decrypted pages in the page cache. 75 76config UBIFS_FS_SECURITY 77 bool "UBIFS Security Labels" 78 depends on UBIFS_FS && UBIFS_FS_XATTR 79 default y 80 help 81 Security labels provide an access control facility to support Linux 82 Security Models (LSMs) accepted by AppArmor, SELinux, Smack and TOMOYO 83 Linux. This option enables an extended attribute handler for file 84 security labels in the ubifs filesystem, so that it requires enabling 85 the extended attribute support in advance. 86 87 If you are not using a security module, say N. 88