1 # SPDX-License-Identifier: GPL-2.0-only <<
2 config UBIFS_FS 1 config UBIFS_FS
3 tristate "UBIFS file system support" 2 tristate "UBIFS file system support"
4 select CRC16 3 select CRC16
5 select CRC32 4 select CRC32
6 select CRYPTO if UBIFS_FS_ADVANCED_COM 5 select CRYPTO if UBIFS_FS_ADVANCED_COMPR
7 select CRYPTO if UBIFS_FS_LZO 6 select CRYPTO if UBIFS_FS_LZO
8 select CRYPTO if UBIFS_FS_ZLIB 7 select CRYPTO if UBIFS_FS_ZLIB
9 select CRYPTO if UBIFS_FS_ZSTD <<
10 select CRYPTO_LZO if UBIFS_FS_LZO 8 select CRYPTO_LZO if UBIFS_FS_LZO
11 select CRYPTO_DEFLATE if UBIFS_FS_ZLIB 9 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_ENCRYP <<
16 depends on MTD_UBI 10 depends on MTD_UBI
17 help 11 help
18 UBIFS is a file system for flash dev 12 UBIFS is a file system for flash devices which works on top of UBI.
19 13
20 if UBIFS_FS <<
21 <<
22 config UBIFS_FS_ADVANCED_COMPR 14 config UBIFS_FS_ADVANCED_COMPR
23 bool "Advanced compression options" 15 bool "Advanced compression options"
>> 16 depends on UBIFS_FS
24 help 17 help
25 This option allows to explicitly cho 18 This option allows to explicitly choose which compressions, if any,
26 are enabled in UBIFS. Removing compr 19 are enabled in UBIFS. Removing compressors means inability to read
27 existing file systems. 20 existing file systems.
28 21
29 If unsure, say 'N'. 22 If unsure, say 'N'.
30 23
31 config UBIFS_FS_LZO 24 config UBIFS_FS_LZO
32 bool "LZO compression support" if UBIF 25 bool "LZO compression support" if UBIFS_FS_ADVANCED_COMPR
>> 26 depends on UBIFS_FS
33 default y 27 default y
34 help 28 help
35 LZO compressor is generally faster 29 LZO compressor is generally faster than zlib but compresses worse.
36 Say 'Y' if unsure. 30 Say 'Y' if unsure.
37 31
38 config UBIFS_FS_ZLIB 32 config UBIFS_FS_ZLIB
39 bool "ZLIB compression support" if UBI 33 bool "ZLIB compression support" if UBIFS_FS_ADVANCED_COMPR
40 default y <<
41 help <<
42 Zlib compresses better than LZO but <<
43 <<
44 config UBIFS_FS_ZSTD <<
45 bool "ZSTD compression support" if UBI <<
46 depends on UBIFS_FS 34 depends on UBIFS_FS
47 default y 35 default y
48 help 36 help
49 ZSTD compresses is a big win in spee !! 37 Zlib compresses better than LZO but it is slower. Say 'Y' if unsure.
50 in compression ratio over LZO. Say ' <<
51 38
52 config UBIFS_ATIME_SUPPORT 39 config UBIFS_ATIME_SUPPORT
53 bool "Access time support" !! 40 bool "Access time support" if UBIFS_FS
>> 41 depends on UBIFS_FS
54 default n 42 default n
55 help 43 help
56 Originally UBIFS did not support ati 44 Originally UBIFS did not support atime, because it looked like a bad idea due
57 increased flash wear. This option ad 45 increased flash wear. This option adds atime support and it is disabled by default
58 to preserve the old behavior. If you 46 to preserve the old behavior. If you enable this option, UBIFS starts updating atime,
59 which means that file-system read op 47 which means that file-system read operations will cause writes (inode atime
60 updates). This may affect file-syste 48 updates). This may affect file-system performance and increase flash device wear,
61 so be careful. How often atime is up 49 so be careful. How often atime is updated depends on the selected strategy:
62 strictatime is the "heavy", relatime 50 strictatime is the "heavy", relatime is "lighter", etc.
63 51
64 If unsure, say 'N' 52 If unsure, say 'N'
65 53
66 config UBIFS_FS_XATTR 54 config UBIFS_FS_XATTR
67 bool "UBIFS XATTR support" 55 bool "UBIFS XATTR support"
>> 56 depends on UBIFS_FS
68 default y 57 default y
69 help 58 help
70 Saying Y here includes support for e 59 Saying Y here includes support for extended attributes (xattrs).
71 Xattrs are name:value pairs associat 60 Xattrs are name:value pairs associated with inodes by
72 the kernel or by users (see the attr 61 the kernel or by users (see the attr(5) manual page).
73 62
74 If unsure, say Y. 63 If unsure, say Y.
75 64
>> 65 config UBIFS_FS_ENCRYPTION
>> 66 bool "UBIFS Encryption"
>> 67 depends on UBIFS_FS && UBIFS_FS_XATTR && BLOCK
>> 68 select FS_ENCRYPTION
>> 69 default n
>> 70 help
>> 71 Enable encryption of UBIFS files and directories. This
>> 72 feature is similar to ecryptfs, but it is more memory
>> 73 efficient since it avoids caching the encrypted and
>> 74 decrypted pages in the page cache.
>> 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 && 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 <<
89 config 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 UB <<
96 against offline changes for both dat <<
97 If you say yes here you should also <<
98 sha256, these are not selected autom <<
99 different options. <<
100 <<
101 endif # UBIFS_FS <<
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