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 if UBIFS_FS_ZSTD 10 select CRYPTO_LZO if UBIFS_FS_LZO 11 select CRYPTO_DEFLATE if UBIFS_FS_ZLIB 12 select CRYPTO_ZSTD if UBIFS_FS_ZSTD 13 select CRYPTO_HASH_INFO 14 select UBIFS_FS_XATTR if FS_ENCRYPTION 15 depends on MTD_UBI 16 help 17 UBIFS is a file system for flash devices which works on top of UBI. 18 19if UBIFS_FS 20 21config UBIFS_FS_ADVANCED_COMPR 22 bool "Advanced compression options" 23 help 24 This option allows to explicitly choose which compressions, if any, 25 are enabled in UBIFS. Removing compressors means inability to read 26 existing file systems. 27 28 If unsure, say 'N'. 29 30config UBIFS_FS_LZO 31 bool "LZO compression support" if UBIFS_FS_ADVANCED_COMPR 32 default y 33 help 34 LZO compressor is generally faster than zlib but compresses worse. 35 Say 'Y' if unsure. 36 37config UBIFS_FS_ZLIB 38 bool "ZLIB compression support" if UBIFS_FS_ADVANCED_COMPR 39 default y 40 help 41 Zlib compresses better than LZO but it is slower. Say 'Y' if unsure. 42 43config UBIFS_FS_ZSTD 44 bool "ZSTD compression support" if UBIFS_FS_ADVANCED_COMPR 45 depends on UBIFS_FS 46 default y 47 help 48 ZSTD compresses is a big win in speed over Zlib and 49 in compression ratio over LZO. Say 'Y' if unsure. 50 51config UBIFS_ATIME_SUPPORT 52 bool "Access time support" 53 default n 54 help 55 Originally UBIFS did not support atime, because it looked like a bad idea due 56 increased flash wear. This option adds atime support and it is disabled by default 57 to preserve the old behavior. If you enable this option, UBIFS starts updating atime, 58 which means that file-system read operations will cause writes (inode atime 59 updates). This may affect file-system performance and increase flash device wear, 60 so be careful. How often atime is updated depends on the selected strategy: 61 strictatime is the "heavy", relatime is "lighter", etc. 62 63 If unsure, say 'N' 64 65config UBIFS_FS_XATTR 66 bool "UBIFS XATTR support" 67 default y 68 help 69 Saying Y here includes support for extended attributes (xattrs). 70 Xattrs are name:value pairs associated with inodes by 71 the kernel or by users (see the attr(5) manual page). 72 73 If unsure, say Y. 74 75config UBIFS_FS_SECURITY 76 bool "UBIFS Security Labels" 77 depends on UBIFS_FS_XATTR 78 default y 79 help 80 Security labels provide an access control facility to support Linux 81 Security Models (LSMs) accepted by AppArmor, SELinux, Smack and TOMOYO 82 Linux. This option enables an extended attribute handler for file 83 security labels in the ubifs filesystem, so that it requires enabling 84 the extended attribute support in advance. 85 86 If you are not using a security module, say N. 87 88config UBIFS_FS_AUTHENTICATION 89 bool "UBIFS authentication support" 90 select KEYS 91 select CRYPTO_HMAC 92 select SYSTEM_DATA_VERIFICATION 93 help 94 Enable authentication support for UBIFS. This feature offers protection 95 against offline changes for both data and metadata of the filesystem. 96 If you say yes here you should also select a hashing algorithm such as 97 sha256, these are not selected automatically since there are many 98 different options. 99 100endif # UBIFS_FS 101