1 # SPDX-License-Identifier: GPL-2.0-only
3 tristate "UBIFS file system support"
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
17 UBIFS is a file system for flash devices which works on top of UBI.
21 config UBIFS_FS_ADVANCED_COMPR
22 bool "Advanced compression options"
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.
31 bool "LZO compression support" if UBIFS_FS_ADVANCED_COMPR
34 LZO compressor is generally faster than zlib but compresses worse.
38 bool "ZLIB compression support" if UBIFS_FS_ADVANCED_COMPR
41 Zlib compresses better than LZO but it is slower. Say 'Y' if unsure.
44 bool "ZSTD compression support" if UBIFS_FS_ADVANCED_COMPR
48 ZSTD compresses is a big win in speed over Zlib and
49 in compression ratio over LZO. Say 'Y' if unsure.
51 config UBIFS_ATIME_SUPPORT
52 bool "Access time support"
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.
66 bool "UBIFS XATTR support"
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).
75 config UBIFS_FS_SECURITY
76 bool "UBIFS Security Labels"
77 depends on UBIFS_FS_XATTR
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.
86 If you are not using a security module, say N.
88 config UBIFS_FS_AUTHENTICATION
89 bool "UBIFS authentication support"
92 select SYSTEM_DATA_VERIFICATION
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