| Artem Bityutskiy | 0d7eff8 | 2008-07-14 19:08:38 +0300 | [diff] [blame] | 1 | config 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 | |
| Artem Bityutskiy | 0d7eff8 | 2008-07-14 19:08:38 +0300 | [diff] [blame] | 14 | config 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, |
| Matt LaPlante | 692105b | 2009-01-26 11:12:25 +0100 | [diff] [blame] | 19 | are enabled in UBIFS. Removing compressors means inability to read |
| Artem Bityutskiy | 0d7eff8 | 2008-07-14 19:08:38 +0300 | [diff] [blame] | 20 | existing file systems. |
| 21 | |
| 22 | If unsure, say 'N'. |
| 23 | |
| 24 | config UBIFS_FS_LZO |
| 25 | bool "LZO compression support" if UBIFS_FS_ADVANCED_COMPR |
| 26 | depends on UBIFS_FS |
| 27 | default y |
| 28 | help |
| Matt LaPlante | 692105b | 2009-01-26 11:12:25 +0100 | [diff] [blame] | 29 | LZO compressor is generally faster than zlib but compresses worse. |
| Artem Bityutskiy | 0d7eff8 | 2008-07-14 19:08:38 +0300 | [diff] [blame] | 30 | Say 'Y' if unsure. |
| 31 | |
| 32 | config UBIFS_FS_ZLIB |
| 33 | bool "ZLIB compression support" if UBIFS_FS_ADVANCED_COMPR |
| 34 | depends on UBIFS_FS |
| 35 | default y |
| 36 | help |
| Frederik Schwarzer | 025dfda | 2008-10-16 19:02:37 +0200 | [diff] [blame] | 37 | Zlib compresses better than LZO but it is slower. Say 'Y' if unsure. |
| Dongsheng Yang | 8c1c5f2 | 2015-11-07 12:46:11 +0800 | [diff] [blame] | 38 | |
| 39 | config 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' |