18c2ecf20Sopenharmony_ci# SPDX-License-Identifier: GPL-2.0-only 28c2ecf20Sopenharmony_ciconfig UBIFS_FS 38c2ecf20Sopenharmony_ci tristate "UBIFS file system support" 48c2ecf20Sopenharmony_ci select CRC16 58c2ecf20Sopenharmony_ci select CRC32 68c2ecf20Sopenharmony_ci select CRYPTO if UBIFS_FS_ADVANCED_COMPR 78c2ecf20Sopenharmony_ci select CRYPTO if UBIFS_FS_LZO 88c2ecf20Sopenharmony_ci select CRYPTO if UBIFS_FS_ZLIB 98c2ecf20Sopenharmony_ci select CRYPTO if UBIFS_FS_ZSTD 108c2ecf20Sopenharmony_ci select CRYPTO_LZO if UBIFS_FS_LZO 118c2ecf20Sopenharmony_ci select CRYPTO_DEFLATE if UBIFS_FS_ZLIB 128c2ecf20Sopenharmony_ci select CRYPTO_ZSTD if UBIFS_FS_ZSTD 138c2ecf20Sopenharmony_ci select CRYPTO_HASH_INFO 148c2ecf20Sopenharmony_ci select UBIFS_FS_XATTR if FS_ENCRYPTION 158c2ecf20Sopenharmony_ci select FS_ENCRYPTION_ALGS if FS_ENCRYPTION 168c2ecf20Sopenharmony_ci depends on MTD_UBI 178c2ecf20Sopenharmony_ci help 188c2ecf20Sopenharmony_ci UBIFS is a file system for flash devices which works on top of UBI. 198c2ecf20Sopenharmony_ci 208c2ecf20Sopenharmony_ciif UBIFS_FS 218c2ecf20Sopenharmony_ci 228c2ecf20Sopenharmony_ciconfig UBIFS_FS_ADVANCED_COMPR 238c2ecf20Sopenharmony_ci bool "Advanced compression options" 248c2ecf20Sopenharmony_ci help 258c2ecf20Sopenharmony_ci This option allows to explicitly choose which compressions, if any, 268c2ecf20Sopenharmony_ci are enabled in UBIFS. Removing compressors means inability to read 278c2ecf20Sopenharmony_ci existing file systems. 288c2ecf20Sopenharmony_ci 298c2ecf20Sopenharmony_ci If unsure, say 'N'. 308c2ecf20Sopenharmony_ci 318c2ecf20Sopenharmony_ciconfig UBIFS_FS_LZO 328c2ecf20Sopenharmony_ci bool "LZO compression support" if UBIFS_FS_ADVANCED_COMPR 338c2ecf20Sopenharmony_ci default y 348c2ecf20Sopenharmony_ci help 358c2ecf20Sopenharmony_ci LZO compressor is generally faster than zlib but compresses worse. 368c2ecf20Sopenharmony_ci Say 'Y' if unsure. 378c2ecf20Sopenharmony_ci 388c2ecf20Sopenharmony_ciconfig UBIFS_FS_ZLIB 398c2ecf20Sopenharmony_ci bool "ZLIB compression support" if UBIFS_FS_ADVANCED_COMPR 408c2ecf20Sopenharmony_ci default y 418c2ecf20Sopenharmony_ci help 428c2ecf20Sopenharmony_ci Zlib compresses better than LZO but it is slower. Say 'Y' if unsure. 438c2ecf20Sopenharmony_ci 448c2ecf20Sopenharmony_ciconfig UBIFS_FS_ZSTD 458c2ecf20Sopenharmony_ci bool "ZSTD compression support" if UBIFS_FS_ADVANCED_COMPR 468c2ecf20Sopenharmony_ci depends on UBIFS_FS 478c2ecf20Sopenharmony_ci default y 488c2ecf20Sopenharmony_ci help 498c2ecf20Sopenharmony_ci ZSTD compresses is a big win in speed over Zlib and 508c2ecf20Sopenharmony_ci in compression ratio over LZO. Say 'Y' if unsure. 518c2ecf20Sopenharmony_ci 528c2ecf20Sopenharmony_ciconfig UBIFS_ATIME_SUPPORT 538c2ecf20Sopenharmony_ci bool "Access time support" 548c2ecf20Sopenharmony_ci default n 558c2ecf20Sopenharmony_ci help 568c2ecf20Sopenharmony_ci Originally UBIFS did not support atime, because it looked like a bad idea due 578c2ecf20Sopenharmony_ci increased flash wear. This option adds atime support and it is disabled by default 588c2ecf20Sopenharmony_ci to preserve the old behavior. If you enable this option, UBIFS starts updating atime, 598c2ecf20Sopenharmony_ci which means that file-system read operations will cause writes (inode atime 608c2ecf20Sopenharmony_ci updates). This may affect file-system performance and increase flash device wear, 618c2ecf20Sopenharmony_ci so be careful. How often atime is updated depends on the selected strategy: 628c2ecf20Sopenharmony_ci strictatime is the "heavy", relatime is "lighter", etc. 638c2ecf20Sopenharmony_ci 648c2ecf20Sopenharmony_ci If unsure, say 'N' 658c2ecf20Sopenharmony_ci 668c2ecf20Sopenharmony_ciconfig UBIFS_FS_XATTR 678c2ecf20Sopenharmony_ci bool "UBIFS XATTR support" 688c2ecf20Sopenharmony_ci default y 698c2ecf20Sopenharmony_ci help 708c2ecf20Sopenharmony_ci Saying Y here includes support for extended attributes (xattrs). 718c2ecf20Sopenharmony_ci Xattrs are name:value pairs associated with inodes by 728c2ecf20Sopenharmony_ci the kernel or by users (see the attr(5) manual page). 738c2ecf20Sopenharmony_ci 748c2ecf20Sopenharmony_ci If unsure, say Y. 758c2ecf20Sopenharmony_ci 768c2ecf20Sopenharmony_ciconfig UBIFS_FS_SECURITY 778c2ecf20Sopenharmony_ci bool "UBIFS Security Labels" 788c2ecf20Sopenharmony_ci depends on UBIFS_FS_XATTR 798c2ecf20Sopenharmony_ci default y 808c2ecf20Sopenharmony_ci help 818c2ecf20Sopenharmony_ci Security labels provide an access control facility to support Linux 828c2ecf20Sopenharmony_ci Security Models (LSMs) accepted by AppArmor, SELinux, Smack and TOMOYO 838c2ecf20Sopenharmony_ci Linux. This option enables an extended attribute handler for file 848c2ecf20Sopenharmony_ci security labels in the ubifs filesystem, so that it requires enabling 858c2ecf20Sopenharmony_ci the extended attribute support in advance. 868c2ecf20Sopenharmony_ci 878c2ecf20Sopenharmony_ci If you are not using a security module, say N. 888c2ecf20Sopenharmony_ci 898c2ecf20Sopenharmony_ciconfig UBIFS_FS_AUTHENTICATION 908c2ecf20Sopenharmony_ci bool "UBIFS authentication support" 918c2ecf20Sopenharmony_ci select KEYS 928c2ecf20Sopenharmony_ci select CRYPTO_HMAC 938c2ecf20Sopenharmony_ci select SYSTEM_DATA_VERIFICATION 948c2ecf20Sopenharmony_ci help 958c2ecf20Sopenharmony_ci Enable authentication support for UBIFS. This feature offers protection 968c2ecf20Sopenharmony_ci against offline changes for both data and metadata of the filesystem. 978c2ecf20Sopenharmony_ci If you say yes here you should also select a hashing algorithm such as 988c2ecf20Sopenharmony_ci sha256, these are not selected automatically since there are many 998c2ecf20Sopenharmony_ci different options. 1008c2ecf20Sopenharmony_ci 1018c2ecf20Sopenharmony_ciendif # UBIFS_FS 102