projects / linux.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 | |
| 49525e5e | 10 | select CRYPTO_HASH_INFO |
| 643fa961 | 11 | select UBIFS_FS_XATTR if FS_ENCRYPTION |
| 0d7eff87 AB |
12 | depends on MTD_UBI |
| 13 | help | |
| 14 | UBIFS is a file system for flash devices which works on top of UBI. | |
| 15 | ||
| aa3d31e0 GU |
16 | if UBIFS_FS |
| 17 | ||
| 0d7eff87 AB |
18 | config UBIFS_FS_ADVANCED_COMPR |
| 19 | bool "Advanced compression options" | |
| 0d7eff87 AB |
20 | help |
| 21 | This option allows to explicitly choose which compressions, if any, | |
| 692105b8 | 22 | are enabled in UBIFS. Removing compressors means inability to read |
| 0d7eff87 AB |
23 | existing file systems. |
| 24 | ||
| 25 | If unsure, say 'N'. | |
| 26 | ||
| 27 | config UBIFS_FS_LZO | |
| 28 | bool "LZO compression support" if UBIFS_FS_ADVANCED_COMPR | |
| 0d7eff87 AB |
29 | default y |
| 30 | help | |
| 692105b8 | 31 | LZO compressor is generally faster than zlib but compresses worse. |
| 0d7eff87 AB |
32 | Say 'Y' if unsure. |
| 33 | ||
| 34 | config UBIFS_FS_ZLIB | |
| 35 | bool "ZLIB compression support" if UBIFS_FS_ADVANCED_COMPR | |
| 0d7eff87 AB |
36 | default y |
| 37 | help | |
| 025dfdaf | 38 | Zlib compresses better than LZO but it is slower. Say 'Y' if unsure. |
| 8c1c5f26 DY |
39 | |
| 40 | config UBIFS_ATIME_SUPPORT | |
| aa3d31e0 | 41 | bool "Access time support" |
| 8c1c5f26 DY |
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 | 53 | |
| 7e5471ce SA |
54 | config UBIFS_FS_XATTR |
| 55 | bool "UBIFS XATTR support" | |
| 7e5471ce SA |
56 | default y |
| 57 | help | |
| 58 | Saying Y here includes support for extended attributes (xattrs). | |
| 59 | Xattrs are name:value pairs associated with inodes by | |
| 60 | the kernel or by users (see the attr(5) manual page). | |
| 61 | ||
| 62 | If unsure, say Y. | |
| 63 | ||
| 8326c1ee HL |
64 | config UBIFS_FS_SECURITY |
| 65 | bool "UBIFS Security Labels" | |
| aa3d31e0 | 66 | depends on UBIFS_FS_XATTR |
| 8326c1ee HL |
67 | default y |
| 68 | help | |
| 69 | Security labels provide an access control facility to support Linux | |
| 70 | Security Models (LSMs) accepted by AppArmor, SELinux, Smack and TOMOYO | |
| 71 | Linux. This option enables an extended attribute handler for file | |
| 72 | security labels in the ubifs filesystem, so that it requires enabling | |
| 73 | the extended attribute support in advance. | |
| 74 | ||
| 75 | If you are not using a security module, say N. | |
| d8a22773 SH |
76 | |
| 77 | config UBIFS_FS_AUTHENTICATION | |
| 78 | bool "UBIFS authentication support" | |
| 60eb5da2 | 79 | depends on KEYS |
| d8a22773 SH |
80 | select CRYPTO_HMAC |
| 81 | help | |
| 82 | Enable authentication support for UBIFS. This feature offers protection | |
| 83 | against offline changes for both data and metadata of the filesystem. | |
| 84 | If you say yes here you should also select a hashing algorithm such as | |
| 85 | sha256, these are not selected automatically since there are many | |
| 86 | different options. | |
| aa3d31e0 GU |
87 | |
| 88 | endif # UBIFS_FS |