xref: /openbmc/linux/fs/ubifs/Kconfig (revision 2cf1c348)
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	select FS_ENCRYPTION_ALGS if FS_ENCRYPTION
16	depends on MTD_UBI
17	help
18	  UBIFS is a file system for flash devices which works on top of UBI.
19
20if UBIFS_FS
21
22config UBIFS_FS_ADVANCED_COMPR
23	bool "Advanced compression options"
24	help
25	  This option allows to explicitly choose which compressions, if any,
26	  are enabled in UBIFS. Removing compressors means inability to read
27	  existing file systems.
28
29	  If unsure, say 'N'.
30
31config UBIFS_FS_LZO
32	bool "LZO compression support" if UBIFS_FS_ADVANCED_COMPR
33	default y
34	help
35	   LZO compressor is generally faster than zlib but compresses worse.
36	   Say 'Y' if unsure.
37
38config UBIFS_FS_ZLIB
39	bool "ZLIB compression support" if UBIFS_FS_ADVANCED_COMPR
40	default y
41	help
42	  Zlib compresses better than LZO but it is slower. Say 'Y' if unsure.
43
44config UBIFS_FS_ZSTD
45	bool "ZSTD compression support" if UBIFS_FS_ADVANCED_COMPR
46	depends on UBIFS_FS
47	default y
48	help
49	  ZSTD compresses is a big win in speed over Zlib and
50	  in compression ratio over LZO. Say 'Y' if unsure.
51
52config UBIFS_ATIME_SUPPORT
53	bool "Access time support"
54	default n
55	help
56	  Originally UBIFS did not support atime, because it looked like a bad idea due
57	  increased flash wear. This option adds atime support and it is disabled by default
58	  to preserve the old behavior. If you enable this option, UBIFS starts updating atime,
59	  which means that file-system read operations will cause writes (inode atime
60	  updates). This may affect file-system performance and increase flash device wear,
61	  so be careful. How often atime is updated depends on the selected strategy:
62	  strictatime is the "heavy", relatime is "lighter", etc.
63
64	  If unsure, say 'N'
65
66config UBIFS_FS_XATTR
67	bool "UBIFS XATTR support"
68	default y
69	help
70	  Saying Y here includes support for extended attributes (xattrs).
71	  Xattrs are name:value pairs associated with inodes by
72	  the kernel or by users (see the attr(5) manual page).
73
74	  If unsure, say Y.
75
76config UBIFS_FS_SECURITY
77	bool "UBIFS Security Labels"
78	depends on UBIFS_FS_XATTR
79	default y
80	help
81	  Security labels provide an access control facility to support Linux
82	  Security Models (LSMs) accepted by AppArmor, SELinux, Smack and TOMOYO
83	  Linux. This option enables an extended attribute handler for file
84	  security labels in the ubifs filesystem, so that it requires enabling
85	  the extended attribute support in advance.
86
87	  If you are not using a security module, say N.
88
89config UBIFS_FS_AUTHENTICATION
90	bool "UBIFS authentication support"
91	select KEYS
92	select CRYPTO_HMAC
93	select SYSTEM_DATA_VERIFICATION
94	help
95	  Enable authentication support for UBIFS. This feature offers protection
96	  against offline changes for both data and metadata of the filesystem.
97	  If you say yes here you should also select a hashing algorithm such as
98	  sha256, these are not selected automatically since there are many
99	  different options.
100
101endif # UBIFS_FS
102