1# SPDX-License-Identifier: GPL-2.0-only 2config UBIFS_FS 3 tristate "UBIFS file system support" 4 select CRC16 5 select CRC32 6 select CRYPTO if UBIFS_FS_ADVANCED_COMPR 7 select CRYPTO if UBIFS_FS_LZO 8 select CRYPTO if UBIFS_FS_ZLIB 9 select CRYPTO_LZO if UBIFS_FS_LZO 10 select CRYPTO_DEFLATE if UBIFS_FS_ZLIB 11 select CRYPTO_HASH_INFO 12 select UBIFS_FS_XATTR if FS_ENCRYPTION 13 depends on MTD_UBI 14 help 15 UBIFS is a file system for flash devices which works on top of UBI. 16 17if UBIFS_FS 18 19config UBIFS_FS_ADVANCED_COMPR 20 bool "Advanced compression options" 21 help 22 This option allows to explicitly choose which compressions, if any, 23 are enabled in UBIFS. Removing compressors means inability to read 24 existing file systems. 25 26 If unsure, say 'N'. 27 28config UBIFS_FS_LZO 29 bool "LZO compression support" if UBIFS_FS_ADVANCED_COMPR 30 default y 31 help 32 LZO compressor is generally faster than zlib but compresses worse. 33 Say 'Y' if unsure. 34 35config UBIFS_FS_ZLIB 36 bool "ZLIB compression support" if UBIFS_FS_ADVANCED_COMPR 37 default y 38 help 39 Zlib compresses better than LZO but it is slower. Say 'Y' if unsure. 40 41config UBIFS_ATIME_SUPPORT 42 bool "Access time support" 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 55config UBIFS_FS_XATTR 56 bool "UBIFS XATTR support" 57 default y 58 help 59 Saying Y here includes support for extended attributes (xattrs). 60 Xattrs are name:value pairs associated with inodes by 61 the kernel or by users (see the attr(5) manual page). 62 63 If unsure, say Y. 64 65config UBIFS_FS_SECURITY 66 bool "UBIFS Security Labels" 67 depends on UBIFS_FS_XATTR 68 default y 69 help 70 Security labels provide an access control facility to support Linux 71 Security Models (LSMs) accepted by AppArmor, SELinux, Smack and TOMOYO 72 Linux. This option enables an extended attribute handler for file 73 security labels in the ubifs filesystem, so that it requires enabling 74 the extended attribute support in advance. 75 76 If you are not using a security module, say N. 77 78config UBIFS_FS_AUTHENTICATION 79 bool "UBIFS authentication support" 80 depends on KEYS 81 select CRYPTO_HMAC 82 help 83 Enable authentication support for UBIFS. This feature offers protection 84 against offline changes for both data and metadata of the filesystem. 85 If you say yes here you should also select a hashing algorithm such as 86 sha256, these are not selected automatically since there are many 87 different options. 88 89endif # UBIFS_FS 90