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ec8f24b7 | 1 | # SPDX-License-Identifier: GPL-2.0-only |
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2 | config JFFS2_FS |
3 | tristate "Journalling Flash File System v2 (JFFS2) support" | |
4 | select CRC32 | |
5 | depends on MTD | |
6 | help | |
7 | JFFS2 is the second generation of the Journalling Flash File System | |
8 | for use on diskless embedded devices. It provides improved wear | |
9 | levelling, compression and support for hard links. You cannot use | |
10 | this on normal block devices, only on 'MTD' devices. | |
11 | ||
12 | Further information on the design and implementation of JFFS2 is | |
13 | available at <http://sources.redhat.com/jffs2/>. | |
14 | ||
15 | config JFFS2_FS_DEBUG | |
16 | int "JFFS2 debugging verbosity (0 = quiet, 2 = noisy)" | |
17 | depends on JFFS2_FS | |
18 | default "0" | |
19 | help | |
20 | This controls the amount of debugging messages produced by the JFFS2 | |
21 | code. Set it to zero for use in production systems. For evaluation, | |
22 | testing and debugging, it's advisable to set it to one. This will | |
23 | enable a few assertions and will print debugging messages at the | |
24 | KERN_DEBUG loglevel, where they won't normally be visible. Level 2 | |
25 | is unlikely to be useful - it enables extra debugging in certain | |
26 | areas which at one point needed debugging, but when the bugs were | |
27 | located and fixed, the detailed messages were relegated to level 2. | |
28 | ||
29 | If reporting bugs, please try to have available a full dump of the | |
30 | messages at debug level 1 while the misbehaviour was occurring. | |
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 support in JFFS2. | |
38 | ||
39 | This functionality is required to support JFFS2 on the following | |
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 page written through the | |
51 | write-buffer, and check for errors. | |
52 | ||
53 | config JFFS2_SUMMARY | |
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54 | bool "JFFS2 summary support" |
55 | depends on JFFS2_FS | |
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56 | default n |
57 | help | |
58 | This feature makes it possible to use summary information | |
59 | for faster filesystem mount. | |
60 | ||
61 | The summary information can be inserted into a filesystem image | |
62 | by the utility 'sumtool'. | |
63 | ||
64 | If unsure, say 'N'. | |
65 | ||
66 | config JFFS2_FS_XATTR | |
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67 | bool "JFFS2 XATTR support" |
68 | depends on JFFS2_FS | |
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69 | default n |
70 | help | |
71 | Extended attributes are name:value pairs associated with inodes by | |
91581e4c | 72 | the kernel or by users (see the attr(5) manual page for details). |
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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) support permissions for users and | |
83 | groups beyond the owner/group/world scheme. | |
84 | ||
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85 | If you don't know what Access Control Lists are, say N |
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 access control models | |
93 | implemented by security modules like SELinux. This option | |
94 | enables an extended attribute handler for file security | |
95 | labels in the jffs2 filesystem. | |
96 | ||
97 | If you are not using a security module that requires using | |
98 | extended attributes for file security labels, say N. | |
99 | ||
100 | config JFFS2_COMPRESSION_OPTIONS | |
101 | bool "Advanced compression options for JFFS2" | |
102 | depends on JFFS2_FS | |
103 | default n | |
104 | help | |
105 | Enabling this option allows you to explicitly choose which | |
106 | compression modules, if any, are enabled in JFFS2. Removing | |
107 | compressors can mean you cannot read existing file systems, | |
108 | and enabling experimental compressors can mean that you | |
109 | write a file system which cannot be read by a standard kernel. | |
110 | ||
111 | If unsure, you should _definitely_ say 'N'. | |
112 | ||
113 | config JFFS2_ZLIB | |
114 | bool "JFFS2 ZLIB compression support" if JFFS2_COMPRESSION_OPTIONS | |
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, general-purpose, legally unencumbered, | |
121 | lossless data-compression library for use on virtually any computer | |
122 | hardware and operating system. See <http://www.gzip.org/zlib/> for | |
123 | further information. | |
124 | ||
125 | Say 'Y' if unsure. | |
126 | ||
127 | config JFFS2_LZO | |
128 | bool "JFFS2 LZO compression support" if JFFS2_COMPRESSION_OPTIONS | |
129 | select LZO_COMPRESS | |
130 | select LZO_DECOMPRESS | |
131 | depends on JFFS2_FS | |
132 | default n | |
133 | help | |
134 | minilzo-based compression. Generally works better than Zlib. | |
135 | ||
136 | This feature was added in July, 2007. Say 'N' if you need | |
137 | compatibility with older bootloaders or kernels. | |
138 | ||
139 | config JFFS2_RTIME | |
140 | bool "JFFS2 RTIME compression support" if JFFS2_COMPRESSION_OPTIONS | |
141 | depends on JFFS2_FS | |
142 | default y | |
143 | help | |
144 | Rtime does manage to recompress already-compressed data. Say 'Y' if unsure. | |
145 | ||
146 | config JFFS2_RUBIN | |
147 | bool "JFFS2 RUBIN compression support" if JFFS2_COMPRESSION_OPTIONS | |
148 | depends on JFFS2_FS | |
149 | default n | |
150 | help | |
151 | RUBINMIPS and DYNRUBIN compressors. Say 'N' if unsure. | |
152 | ||
153 | choice | |
154 | prompt "JFFS2 default compression mode" if JFFS2_COMPRESSION_OPTIONS | |
155 | default JFFS2_CMODE_PRIORITY | |
156 | depends on JFFS2_FS | |
157 | help | |
158 | You can set here the default compression mode of JFFS2 from | |
159 | the available compression modes. Don't touch if unsure. | |
160 | ||
161 | config JFFS2_CMODE_NONE | |
162 | bool "no compression" | |
163 | help | |
164 | Uses no compression. | |
165 | ||
166 | config JFFS2_CMODE_PRIORITY | |
167 | bool "priority" | |
168 | help | |
169 | Tries the compressors in a predefined order and chooses the first | |
170 | successful one. | |
171 | ||
172 | config JFFS2_CMODE_SIZE | |
cf98c5e5 | 173 | bool "size" |
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174 | help |
175 | Tries all compressors and chooses the one which has the smallest | |
176 | result. | |
177 | ||
178 | config JFFS2_CMODE_FAVOURLZO | |
179 | bool "Favour LZO" | |
180 | help | |
181 | Tries all compressors and chooses the one which has the smallest | |
182 | result but gives some preference to LZO (which has faster | |
183 | decompression) at the expense of size. | |
184 | ||
185 | endchoice |