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