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_ENCRYPTION 55 bool "UBIFS Encryption" 56 depends on UBIFS_FS 57 select FS_ENCRYPTION 58 default n 59 help 60 Enable encryption of UBIFS files and directories. This 61 feature is similar to ecryptfs, but it is more memory 62 efficient since it avoids caching the encrypted and 63 decrypted pages in the page cache. 64