1 # SPDX-License-Identifier: GPL-2.0-only <<
2 config JFFS2_FS 1 config JFFS2_FS
3 tristate "Journalling Flash File Syste 2 tristate "Journalling Flash File System v2 (JFFS2) support"
4 select CRC32 3 select CRC32
5 depends on MTD 4 depends on MTD
6 help 5 help
7 JFFS2 is the second generation of th 6 JFFS2 is the second generation of the Journalling Flash File System
8 for use on diskless embedded devices 7 for use on diskless embedded devices. It provides improved wear
9 levelling, compression and support f 8 levelling, compression and support for hard links. You cannot use
10 this on normal block devices, only o 9 this on normal block devices, only on 'MTD' devices.
11 10
12 Further information on the design an 11 Further information on the design and implementation of JFFS2 is
13 available at <http://sources.redhat. 12 available at <http://sources.redhat.com/jffs2/>.
14 13
15 config JFFS2_FS_DEBUG 14 config JFFS2_FS_DEBUG
16 int "JFFS2 debugging verbosity (0 = qu 15 int "JFFS2 debugging verbosity (0 = quiet, 2 = noisy)"
17 depends on JFFS2_FS 16 depends on JFFS2_FS
18 default "0" 17 default "0"
19 help 18 help
20 This controls the amount of debuggin 19 This controls the amount of debugging messages produced by the JFFS2
21 code. Set it to zero for use in prod 20 code. Set it to zero for use in production systems. For evaluation,
22 testing and debugging, it's advisabl 21 testing and debugging, it's advisable to set it to one. This will
23 enable a few assertions and will pri 22 enable a few assertions and will print debugging messages at the
24 KERN_DEBUG loglevel, where they won' 23 KERN_DEBUG loglevel, where they won't normally be visible. Level 2
25 is unlikely to be useful - it enable 24 is unlikely to be useful - it enables extra debugging in certain
26 areas which at one point needed debu 25 areas which at one point needed debugging, but when the bugs were
27 located and fixed, the detailed mess 26 located and fixed, the detailed messages were relegated to level 2.
28 27
29 If reporting bugs, please try to hav 28 If reporting bugs, please try to have available a full dump of the
30 messages at debug level 1 while the 29 messages at debug level 1 while the misbehaviour was occurring.
31 30
32 config JFFS2_FS_WRITEBUFFER 31 config JFFS2_FS_WRITEBUFFER
33 bool "JFFS2 write-buffering support" 32 bool "JFFS2 write-buffering support"
34 depends on JFFS2_FS 33 depends on JFFS2_FS
35 default y 34 default y
36 help 35 help
37 This enables the write-buffering sup 36 This enables the write-buffering support in JFFS2.
38 37
39 This functionality is required to su 38 This functionality is required to support JFFS2 on the following
40 types of flash devices: 39 types of flash devices:
41 - NAND flash 40 - NAND flash
42 - NOR flash with transparent ECC 41 - NOR flash with transparent ECC
43 - DataFlash 42 - DataFlash
44 43
45 config JFFS2_FS_WBUF_VERIFY 44 config JFFS2_FS_WBUF_VERIFY
46 bool "Verify JFFS2 write-buffer reads" 45 bool "Verify JFFS2 write-buffer reads"
47 depends on JFFS2_FS_WRITEBUFFER 46 depends on JFFS2_FS_WRITEBUFFER
48 default n 47 default n
49 help 48 help
50 This causes JFFS2 to read back every 49 This causes JFFS2 to read back every page written through the
51 write-buffer, and check for errors. 50 write-buffer, and check for errors.
52 51
53 config JFFS2_SUMMARY 52 config JFFS2_SUMMARY
54 bool "JFFS2 summary support" 53 bool "JFFS2 summary support"
55 depends on JFFS2_FS 54 depends on JFFS2_FS
56 default n 55 default n
57 help 56 help
58 This feature makes it possible to us 57 This feature makes it possible to use summary information
59 for faster filesystem mount. 58 for faster filesystem mount.
60 59
61 The summary information can be inser 60 The summary information can be inserted into a filesystem image
62 by the utility 'sumtool'. 61 by the utility 'sumtool'.
63 62
64 If unsure, say 'N'. 63 If unsure, say 'N'.
65 64
66 config JFFS2_FS_XATTR 65 config JFFS2_FS_XATTR
67 bool "JFFS2 XATTR support" 66 bool "JFFS2 XATTR support"
68 depends on JFFS2_FS 67 depends on JFFS2_FS
69 default n 68 default n
70 help 69 help
71 Extended attributes are name:value p 70 Extended attributes are name:value pairs associated with inodes by
72 the kernel or by users (see the attr 71 the kernel or by users (see the attr(5) manual page for details).
73 72
74 If unsure, say N. 73 If unsure, say N.
75 74
76 config JFFS2_FS_POSIX_ACL 75 config JFFS2_FS_POSIX_ACL
77 bool "JFFS2 POSIX Access Control Lists 76 bool "JFFS2 POSIX Access Control Lists"
78 depends on JFFS2_FS_XATTR 77 depends on JFFS2_FS_XATTR
79 default y 78 default y
80 select FS_POSIX_ACL 79 select FS_POSIX_ACL
81 help 80 help
82 Posix Access Control Lists (ACLs) su 81 Posix Access Control Lists (ACLs) support permissions for users and
83 groups beyond the owner/group/world 82 groups beyond the owner/group/world scheme.
84 83
85 If you don't know what Access Contro 84 If you don't know what Access Control Lists are, say N
86 85
87 config JFFS2_FS_SECURITY 86 config JFFS2_FS_SECURITY
88 bool "JFFS2 Security Labels" 87 bool "JFFS2 Security Labels"
89 depends on JFFS2_FS_XATTR 88 depends on JFFS2_FS_XATTR
90 default y 89 default y
91 help 90 help
92 Security labels support alternative 91 Security labels support alternative access control models
93 implemented by security modules like 92 implemented by security modules like SELinux. This option
94 enables an extended attribute handle 93 enables an extended attribute handler for file security
95 labels in the jffs2 filesystem. 94 labels in the jffs2 filesystem.
96 95
97 If you are not using a security modu 96 If you are not using a security module that requires using
98 extended attributes for file securit 97 extended attributes for file security labels, say N.
99 98
100 config JFFS2_COMPRESSION_OPTIONS 99 config JFFS2_COMPRESSION_OPTIONS
101 bool "Advanced compression options for 100 bool "Advanced compression options for JFFS2"
102 depends on JFFS2_FS 101 depends on JFFS2_FS
103 default n 102 default n
104 help 103 help
105 Enabling this option allows you to e 104 Enabling this option allows you to explicitly choose which
106 compression modules, if any, are ena 105 compression modules, if any, are enabled in JFFS2. Removing
107 compressors can mean you cannot read 106 compressors can mean you cannot read existing file systems,
108 and enabling experimental compressor 107 and enabling experimental compressors can mean that you
109 write a file system which cannot be 108 write a file system which cannot be read by a standard kernel.
110 109
111 If unsure, you should _definitely_ s 110 If unsure, you should _definitely_ say 'N'.
112 111
113 config JFFS2_ZLIB 112 config JFFS2_ZLIB
114 bool "JFFS2 ZLIB compression support" 113 bool "JFFS2 ZLIB compression support" if JFFS2_COMPRESSION_OPTIONS
115 select ZLIB_INFLATE 114 select ZLIB_INFLATE
116 select ZLIB_DEFLATE 115 select ZLIB_DEFLATE
117 depends on JFFS2_FS 116 depends on JFFS2_FS
118 default y 117 default y
119 help 118 help
120 Zlib is designed to be a free, gener 119 Zlib is designed to be a free, general-purpose, legally unencumbered,
121 lossless data-compression library fo 120 lossless data-compression library for use on virtually any computer
122 hardware and operating system. See < 121 hardware and operating system. See <http://www.gzip.org/zlib/> for
123 further information. 122 further information.
124 123
125 Say 'Y' if unsure. 124 Say 'Y' if unsure.
126 125
127 config JFFS2_LZO 126 config JFFS2_LZO
128 bool "JFFS2 LZO compression support" i 127 bool "JFFS2 LZO compression support" if JFFS2_COMPRESSION_OPTIONS
129 select LZO_COMPRESS 128 select LZO_COMPRESS
130 select LZO_DECOMPRESS 129 select LZO_DECOMPRESS
131 depends on JFFS2_FS 130 depends on JFFS2_FS
132 default n 131 default n
133 help 132 help
134 minilzo-based compression. Generally 133 minilzo-based compression. Generally works better than Zlib.
135 134
136 This feature was added in July, 2007 135 This feature was added in July, 2007. Say 'N' if you need
137 compatibility with older bootloaders 136 compatibility with older bootloaders or kernels.
138 137
139 config JFFS2_RTIME 138 config JFFS2_RTIME
140 bool "JFFS2 RTIME compression support" 139 bool "JFFS2 RTIME compression support" if JFFS2_COMPRESSION_OPTIONS
141 depends on JFFS2_FS 140 depends on JFFS2_FS
142 default y 141 default y
143 help 142 help
144 Rtime does manage to recompress alre 143 Rtime does manage to recompress already-compressed data. Say 'Y' if unsure.
145 144
146 config JFFS2_RUBIN 145 config JFFS2_RUBIN
147 bool "JFFS2 RUBIN compression support" 146 bool "JFFS2 RUBIN compression support" if JFFS2_COMPRESSION_OPTIONS
148 depends on JFFS2_FS 147 depends on JFFS2_FS
149 default n 148 default n
150 help 149 help
151 RUBINMIPS and DYNRUBIN compressors. 150 RUBINMIPS and DYNRUBIN compressors. Say 'N' if unsure.
152 151
153 choice 152 choice
154 prompt "JFFS2 default compression mode !! 153 prompt "JFFS2 default compression mode" if JFFS2_COMPRESSION_OPTIONS
155 default JFFS2_CMODE_PRIORITY 154 default JFFS2_CMODE_PRIORITY
156 depends on JFFS2_COMPRESSION_OPTIONS <<
157 depends on JFFS2_FS 155 depends on JFFS2_FS
158 help 156 help
159 You can set here the default compres 157 You can set here the default compression mode of JFFS2 from
160 the available compression modes. Don 158 the available compression modes. Don't touch if unsure.
161 159
162 config JFFS2_CMODE_NONE 160 config JFFS2_CMODE_NONE
163 bool "no compression" 161 bool "no compression"
164 help 162 help
165 Uses no compression. 163 Uses no compression.
166 164
167 config JFFS2_CMODE_PRIORITY 165 config JFFS2_CMODE_PRIORITY
168 bool "priority" 166 bool "priority"
169 help 167 help
170 Tries the compressors in a predefine 168 Tries the compressors in a predefined order and chooses the first
171 successful one. 169 successful one.
172 170
173 config JFFS2_CMODE_SIZE 171 config JFFS2_CMODE_SIZE
174 bool "size" 172 bool "size"
175 help 173 help
176 Tries all compressors and chooses th 174 Tries all compressors and chooses the one which has the smallest
177 result. 175 result.
178 176
179 config JFFS2_CMODE_FAVOURLZO 177 config JFFS2_CMODE_FAVOURLZO
180 bool "Favour LZO" 178 bool "Favour LZO"
181 help 179 help
182 Tries all compressors and chooses th 180 Tries all compressors and chooses the one which has the smallest
183 result but gives some preference to 181 result but gives some preference to LZO (which has faster
184 decompression) at the expense of siz 182 decompression) at the expense of size.
185 183
186 endchoice 184 endchoice
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