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- config SQUASHFS
- tristate "SquashFS 4.0 - Squashed file system support"
- depends on BLOCK
- select ZLIB_INFLATE
- help
- Saying Y here includes support for SquashFS 4.0 (a Compressed
- Read-Only File System). Squashfs is a highly compressed read-only
- filesystem for Linux. It uses zlib, lzo or xz compression to
- compress both files, inodes and directories. Inodes in the system
- are very small and all blocks are packed to minimise data overhead.
- Block sizes greater than 4K are supported up to a maximum of 1 Mbytes
- (default block size 128K). SquashFS 4.0 supports 64 bit filesystems
- and files (larger than 4GB), full uid/gid information, hard links and
- timestamps.
- Squashfs is intended for general read-only filesystem use, for
- archival use (i.e. in cases where a .tar.gz file may be used), and in
- embedded systems where low overhead is needed. Further information
- and tools are available from http://squashfs.sourceforge.net.
- If you want to compile this as a module ( = code which can be
- inserted in and removed from the running kernel whenever you want),
- say M here and read <file:Documentation/modules.txt>. The module
- will be called squashfs. Note that the root file system (the one
- containing the directory /) cannot be compiled as a module.
- If unsure, say N.
- config SQUASHFS_XATTR
- bool "Squashfs XATTR support"
- depends on SQUASHFS
- help
- Saying Y here includes support for extended attributes (xattrs).
- Xattrs are name:value pairs associated with inodes by
- the kernel or by users (see the attr(5) manual page).
- If unsure, say N.
- config SQUASHFS_LZO
- bool "Include support for LZO compressed file systems"
- depends on SQUASHFS
- select LZO_DECOMPRESS
- help
- Saying Y here includes support for reading Squashfs file systems
- compressed with LZO compression. LZO compression is mainly
- aimed at embedded systems with slower CPUs where the overheads
- of zlib are too high.
- LZO is not the standard compression used in Squashfs and so most
- file systems will be readable without selecting this option.
- If unsure, say N.
- config SQUASHFS_XZ
- bool "Include support for XZ compressed file systems"
- depends on SQUASHFS
- select XZ_DEC
- help
- Saying Y here includes support for reading Squashfs file systems
- compressed with XZ compression. XZ gives better compression than
- the default zlib compression, at the expense of greater CPU and
- memory overhead.
- XZ is not the standard compression used in Squashfs and so most
- file systems will be readable without selecting this option.
- If unsure, say N.
- config SQUASHFS_EMBEDDED
- bool "Additional option for memory-constrained systems"
- depends on SQUASHFS
- help
- Saying Y here allows you to specify cache size.
- If unsure, say N.
- config SQUASHFS_FRAGMENT_CACHE_SIZE
- int "Number of fragments cached" if SQUASHFS_EMBEDDED
- depends on SQUASHFS
- default "3"
- help
- By default SquashFS caches the last 3 fragments read from
- the filesystem. Increasing this amount may mean SquashFS
- has to re-read fragments less often from disk, at the expense
- of extra system memory. Decreasing this amount will mean
- SquashFS uses less memory at the expense of extra reads from disk.
- Note there must be at least one cached fragment. Anything
- much more than three will probably not make much difference.
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