projects / mirror_ubuntu-artful-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 0d7eff87 AB |
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 | ||
| 0d7eff87 AB |
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, | |
| 692105b8 | 19 | are enabled in UBIFS. Removing compressors means inability to read |
| 0d7eff87 AB |
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 | |
| 692105b8 | 29 | LZO compressor is generally faster than zlib but compresses worse. |
| 0d7eff87 AB |
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 | |
| 025dfdaf | 37 | Zlib compresses better than LZO but it is slower. Say 'Y' if unsure. |
| 8c1c5f26 DY |
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' | |
| d475a507 RW |
53 | |
| 54 | config 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. |