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185 lines
5.5 KiB
185 lines
5.5 KiB
# SPDX-License-Identifier: GPL-2.0-only |
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config JFFS2_FS |
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tristate "Journalling Flash File System v2 (JFFS2) support" |
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select CRC32 |
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depends on MTD |
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help |
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JFFS2 is the second generation of the Journalling Flash File System |
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for use on diskless embedded devices. It provides improved wear |
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levelling, compression and support for hard links. You cannot use |
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this on normal block devices, only on 'MTD' devices. |
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Further information on the design and implementation of JFFS2 is |
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available at <http://sources.redhat.com/jffs2/>. |
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config JFFS2_FS_DEBUG |
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int "JFFS2 debugging verbosity (0 = quiet, 2 = noisy)" |
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depends on JFFS2_FS |
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default "0" |
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help |
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This controls the amount of debugging messages produced by the JFFS2 |
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code. Set it to zero for use in production systems. For evaluation, |
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testing and debugging, it's advisable to set it to one. This will |
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enable a few assertions and will print debugging messages at the |
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KERN_DEBUG loglevel, where they won't normally be visible. Level 2 |
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is unlikely to be useful - it enables extra debugging in certain |
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areas which at one point needed debugging, but when the bugs were |
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located and fixed, the detailed messages were relegated to level 2. |
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If reporting bugs, please try to have available a full dump of the |
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messages at debug level 1 while the misbehaviour was occurring. |
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config JFFS2_FS_WRITEBUFFER |
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bool "JFFS2 write-buffering support" |
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depends on JFFS2_FS |
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default y |
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help |
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This enables the write-buffering support in JFFS2. |
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This functionality is required to support JFFS2 on the following |
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types of flash devices: |
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- NAND flash |
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- NOR flash with transparent ECC |
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- DataFlash |
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config JFFS2_FS_WBUF_VERIFY |
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bool "Verify JFFS2 write-buffer reads" |
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depends on JFFS2_FS_WRITEBUFFER |
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default n |
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help |
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This causes JFFS2 to read back every page written through the |
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write-buffer, and check for errors. |
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config JFFS2_SUMMARY |
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bool "JFFS2 summary support" |
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depends on JFFS2_FS |
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default n |
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help |
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This feature makes it possible to use summary information |
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for faster filesystem mount. |
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The summary information can be inserted into a filesystem image |
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by the utility 'sumtool'. |
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If unsure, say 'N'. |
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config JFFS2_FS_XATTR |
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bool "JFFS2 XATTR support" |
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depends on JFFS2_FS |
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default n |
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help |
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Extended attributes are name:value pairs associated with inodes by |
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the kernel or by users (see the attr(5) manual page for details). |
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If unsure, say N. |
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config JFFS2_FS_POSIX_ACL |
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bool "JFFS2 POSIX Access Control Lists" |
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depends on JFFS2_FS_XATTR |
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default y |
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select FS_POSIX_ACL |
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help |
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Posix Access Control Lists (ACLs) support permissions for users and |
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groups beyond the owner/group/world scheme. |
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If you don't know what Access Control Lists are, say N |
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config JFFS2_FS_SECURITY |
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bool "JFFS2 Security Labels" |
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depends on JFFS2_FS_XATTR |
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default y |
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help |
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Security labels support alternative access control models |
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implemented by security modules like SELinux. This option |
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enables an extended attribute handler for file security |
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labels in the jffs2 filesystem. |
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If you are not using a security module that requires using |
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extended attributes for file security labels, say N. |
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config JFFS2_COMPRESSION_OPTIONS |
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bool "Advanced compression options for JFFS2" |
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depends on JFFS2_FS |
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default n |
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help |
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Enabling this option allows you to explicitly choose which |
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compression modules, if any, are enabled in JFFS2. Removing |
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compressors can mean you cannot read existing file systems, |
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and enabling experimental compressors can mean that you |
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write a file system which cannot be read by a standard kernel. |
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If unsure, you should _definitely_ say 'N'. |
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config JFFS2_ZLIB |
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bool "JFFS2 ZLIB compression support" if JFFS2_COMPRESSION_OPTIONS |
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select ZLIB_INFLATE |
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select ZLIB_DEFLATE |
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depends on JFFS2_FS |
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default y |
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help |
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Zlib is designed to be a free, general-purpose, legally unencumbered, |
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lossless data-compression library for use on virtually any computer |
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hardware and operating system. See <http://www.gzip.org/zlib/> for |
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further information. |
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Say 'Y' if unsure. |
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config JFFS2_LZO |
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bool "JFFS2 LZO compression support" if JFFS2_COMPRESSION_OPTIONS |
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select LZO_COMPRESS |
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select LZO_DECOMPRESS |
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depends on JFFS2_FS |
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default n |
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help |
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minilzo-based compression. Generally works better than Zlib. |
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This feature was added in July, 2007. Say 'N' if you need |
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compatibility with older bootloaders or kernels. |
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config JFFS2_RTIME |
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bool "JFFS2 RTIME compression support" if JFFS2_COMPRESSION_OPTIONS |
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depends on JFFS2_FS |
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default y |
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help |
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Rtime does manage to recompress already-compressed data. Say 'Y' if unsure. |
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config JFFS2_RUBIN |
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bool "JFFS2 RUBIN compression support" if JFFS2_COMPRESSION_OPTIONS |
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depends on JFFS2_FS |
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default n |
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help |
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RUBINMIPS and DYNRUBIN compressors. Say 'N' if unsure. |
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choice |
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prompt "JFFS2 default compression mode" if JFFS2_COMPRESSION_OPTIONS |
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default JFFS2_CMODE_PRIORITY |
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depends on JFFS2_FS |
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help |
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You can set here the default compression mode of JFFS2 from |
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the available compression modes. Don't touch if unsure. |
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config JFFS2_CMODE_NONE |
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bool "no compression" |
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help |
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Uses no compression. |
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config JFFS2_CMODE_PRIORITY |
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bool "priority" |
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help |
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Tries the compressors in a predefined order and chooses the first |
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successful one. |
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config JFFS2_CMODE_SIZE |
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bool "size" |
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help |
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Tries all compressors and chooses the one which has the smallest |
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result. |
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config JFFS2_CMODE_FAVOURLZO |
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bool "Favour LZO" |
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help |
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Tries all compressors and chooses the one which has the smallest |
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result but gives some preference to LZO (which has faster |
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decompression) at the expense of size. |
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endchoice
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