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' |