| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [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 | select UBIFS_FS_XATTR if FS_ENCRYPTION |
| 11 | depends on MTD_UBI |
| 12 | help |
| 13 | UBIFS is a file system for flash devices which works on top of UBI. |
| 14 | |
| 15 | config UBIFS_FS_ADVANCED_COMPR |
| 16 | bool "Advanced compression options" |
| 17 | depends on UBIFS_FS |
| 18 | help |
| 19 | This option allows to explicitly choose which compressions, if any, |
| 20 | are enabled in UBIFS. Removing compressors means inability to read |
| 21 | existing file systems. |
| 22 | |
| 23 | If unsure, say 'N'. |
| 24 | |
| 25 | config UBIFS_FS_LZO |
| 26 | bool "LZO compression support" if UBIFS_FS_ADVANCED_COMPR |
| 27 | depends on UBIFS_FS |
| 28 | default y |
| 29 | help |
| 30 | LZO compressor is generally faster than zlib but compresses worse. |
| 31 | Say 'Y' if unsure. |
| 32 | |
| 33 | config UBIFS_FS_ZLIB |
| 34 | bool "ZLIB compression support" if UBIFS_FS_ADVANCED_COMPR |
| 35 | depends on UBIFS_FS |
| 36 | default y |
| 37 | help |
| 38 | Zlib compresses better than LZO but it is slower. Say 'Y' if unsure. |
| 39 | |
| 40 | config UBIFS_ATIME_SUPPORT |
| 41 | bool "Access time support" if UBIFS_FS |
| 42 | depends on UBIFS_FS |
| 43 | default n |
| 44 | help |
| 45 | Originally UBIFS did not support atime, because it looked like a bad idea due |
| 46 | increased flash wear. This option adds atime support and it is disabled by default |
| 47 | to preserve the old behavior. If you enable this option, UBIFS starts updating atime, |
| 48 | which means that file-system read operations will cause writes (inode atime |
| 49 | updates). This may affect file-system performance and increase flash device wear, |
| 50 | so be careful. How often atime is updated depends on the selected strategy: |
| 51 | strictatime is the "heavy", relatime is "lighter", etc. |
| 52 | |
| 53 | If unsure, say 'N' |
| 54 | |
| 55 | config UBIFS_FS_XATTR |
| 56 | bool "UBIFS XATTR support" |
| 57 | depends on UBIFS_FS |
| 58 | default y |
| 59 | help |
| 60 | Saying Y here includes support for extended attributes (xattrs). |
| 61 | Xattrs are name:value pairs associated with inodes by |
| 62 | the kernel or by users (see the attr(5) manual page). |
| 63 | |
| 64 | If unsure, say Y. |
| 65 | |
| 66 | config UBIFS_FS_SECURITY |
| 67 | bool "UBIFS Security Labels" |
| 68 | depends on UBIFS_FS && UBIFS_FS_XATTR |
| 69 | default y |
| 70 | help |
| 71 | Security labels provide an access control facility to support Linux |
| 72 | Security Models (LSMs) accepted by AppArmor, SELinux, Smack and TOMOYO |
| 73 | Linux. This option enables an extended attribute handler for file |
| 74 | security labels in the ubifs filesystem, so that it requires enabling |
| 75 | the extended attribute support in advance. |
| 76 | |
| 77 | If you are not using a security module, say N. |
| 78 | |
| 79 | config UBIFS_FS_FORMAT4 |
| 80 | bool "Use file system format version 4 for new file systems" |
| 81 | depends on UBIFS_FS |
| 82 | help |
| 83 | Instead of creating new file systems with the new ubifs file |
| 84 | system version 5, use the old format version 4 for implicitly |
| 85 | by the driver created file systems on an empty UBI volume. This |
| 86 | makes it possible to mount these file systems also with kernel |
| 87 | versions before 4.10. The driver will still support file system |
| 88 | format version 5 for ubifs file systems created with version 5. |
| 89 | |
| 90 | If you are unsure, say N. |