1 # SPDX-License-Identifier: GPL-2.0-only 1 # SPDX-License-Identifier: GPL-2.0-only
2 config UBIFS_FS 2 config UBIFS_FS
3 tristate "UBIFS file system support" 3 tristate "UBIFS file system support"
4 select CRC16 4 select CRC16
5 select CRC32 5 select CRC32
6 select CRYPTO if UBIFS_FS_ADVANCED_COM 6 select CRYPTO if UBIFS_FS_ADVANCED_COMPR
7 select CRYPTO if UBIFS_FS_LZO 7 select CRYPTO if UBIFS_FS_LZO
8 select CRYPTO if UBIFS_FS_ZLIB 8 select CRYPTO if UBIFS_FS_ZLIB
9 select CRYPTO if UBIFS_FS_ZSTD 9 select CRYPTO if UBIFS_FS_ZSTD
10 select CRYPTO_LZO if UBIFS_FS_LZO 10 select CRYPTO_LZO if UBIFS_FS_LZO
11 select CRYPTO_DEFLATE if UBIFS_FS_ZLIB 11 select CRYPTO_DEFLATE if UBIFS_FS_ZLIB
12 select CRYPTO_ZSTD if UBIFS_FS_ZSTD 12 select CRYPTO_ZSTD if UBIFS_FS_ZSTD
13 select CRYPTO_HASH_INFO 13 select CRYPTO_HASH_INFO
14 select UBIFS_FS_XATTR if FS_ENCRYPTION 14 select UBIFS_FS_XATTR if FS_ENCRYPTION
15 select FS_ENCRYPTION_ALGS if FS_ENCRYP 15 select FS_ENCRYPTION_ALGS if FS_ENCRYPTION
16 depends on MTD_UBI 16 depends on MTD_UBI
17 help 17 help
18 UBIFS is a file system for flash dev 18 UBIFS is a file system for flash devices which works on top of UBI.
19 19
20 if UBIFS_FS 20 if UBIFS_FS
21 21
22 config UBIFS_FS_ADVANCED_COMPR 22 config UBIFS_FS_ADVANCED_COMPR
23 bool "Advanced compression options" 23 bool "Advanced compression options"
24 help 24 help
25 This option allows to explicitly cho 25 This option allows to explicitly choose which compressions, if any,
26 are enabled in UBIFS. Removing compr 26 are enabled in UBIFS. Removing compressors means inability to read
27 existing file systems. 27 existing file systems.
28 28
29 If unsure, say 'N'. 29 If unsure, say 'N'.
30 30
31 config UBIFS_FS_LZO 31 config UBIFS_FS_LZO
32 bool "LZO compression support" if UBIF 32 bool "LZO compression support" if UBIFS_FS_ADVANCED_COMPR
33 default y 33 default y
34 help 34 help
35 LZO compressor is generally faster 35 LZO compressor is generally faster than zlib but compresses worse.
36 Say 'Y' if unsure. 36 Say 'Y' if unsure.
37 37
38 config UBIFS_FS_ZLIB 38 config UBIFS_FS_ZLIB
39 bool "ZLIB compression support" if UBI 39 bool "ZLIB compression support" if UBIFS_FS_ADVANCED_COMPR
40 default y 40 default y
41 help 41 help
42 Zlib compresses better than LZO but 42 Zlib compresses better than LZO but it is slower. Say 'Y' if unsure.
43 43
44 config UBIFS_FS_ZSTD 44 config UBIFS_FS_ZSTD
45 bool "ZSTD compression support" if UBI 45 bool "ZSTD compression support" if UBIFS_FS_ADVANCED_COMPR
46 depends on UBIFS_FS 46 depends on UBIFS_FS
47 default y 47 default y
48 help 48 help
49 ZSTD compresses is a big win in spee 49 ZSTD compresses is a big win in speed over Zlib and
50 in compression ratio over LZO. Say ' 50 in compression ratio over LZO. Say 'Y' if unsure.
51 51
52 config UBIFS_ATIME_SUPPORT 52 config UBIFS_ATIME_SUPPORT
53 bool "Access time support" 53 bool "Access time support"
54 default n 54 default n
55 help 55 help
56 Originally UBIFS did not support ati 56 Originally UBIFS did not support atime, because it looked like a bad idea due
57 increased flash wear. This option ad 57 increased flash wear. This option adds atime support and it is disabled by default
58 to preserve the old behavior. If you 58 to preserve the old behavior. If you enable this option, UBIFS starts updating atime,
59 which means that file-system read op 59 which means that file-system read operations will cause writes (inode atime
60 updates). This may affect file-syste 60 updates). This may affect file-system performance and increase flash device wear,
61 so be careful. How often atime is up 61 so be careful. How often atime is updated depends on the selected strategy:
62 strictatime is the "heavy", relatime 62 strictatime is the "heavy", relatime is "lighter", etc.
63 63
64 If unsure, say 'N' 64 If unsure, say 'N'
65 65
66 config UBIFS_FS_XATTR 66 config UBIFS_FS_XATTR
67 bool "UBIFS XATTR support" 67 bool "UBIFS XATTR support"
68 default y 68 default y
69 help 69 help
70 Saying Y here includes support for e 70 Saying Y here includes support for extended attributes (xattrs).
71 Xattrs are name:value pairs associat 71 Xattrs are name:value pairs associated with inodes by
72 the kernel or by users (see the attr 72 the kernel or by users (see the attr(5) manual page).
73 73
74 If unsure, say Y. 74 If unsure, say Y.
75 75
76 config UBIFS_FS_SECURITY 76 config UBIFS_FS_SECURITY
77 bool "UBIFS Security Labels" 77 bool "UBIFS Security Labels"
78 depends on UBIFS_FS_XATTR 78 depends on UBIFS_FS_XATTR
79 default y 79 default y
80 help 80 help
81 Security labels provide an access co 81 Security labels provide an access control facility to support Linux
82 Security Models (LSMs) accepted by A 82 Security Models (LSMs) accepted by AppArmor, SELinux, Smack and TOMOYO
83 Linux. This option enables an extend 83 Linux. This option enables an extended attribute handler for file
84 security labels in the ubifs filesys 84 security labels in the ubifs filesystem, so that it requires enabling
85 the extended attribute support in ad 85 the extended attribute support in advance.
86 86
87 If you are not using a security modu 87 If you are not using a security module, say N.
88 88
89 config UBIFS_FS_AUTHENTICATION 89 config UBIFS_FS_AUTHENTICATION
90 bool "UBIFS authentication support" 90 bool "UBIFS authentication support"
91 select KEYS 91 select KEYS
92 select CRYPTO_HMAC 92 select CRYPTO_HMAC
93 select SYSTEM_DATA_VERIFICATION 93 select SYSTEM_DATA_VERIFICATION
94 help 94 help
95 Enable authentication support for UB 95 Enable authentication support for UBIFS. This feature offers protection
96 against offline changes for both dat 96 against offline changes for both data and metadata of the filesystem.
97 If you say yes here you should also 97 If you say yes here you should also select a hashing algorithm such as
98 sha256, these are not selected autom 98 sha256, these are not selected automatically since there are many
99 different options. 99 different options.
100 100
101 endif # UBIFS_FS 101 endif # UBIFS_FS
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