Squashfs: Kconfig entry

Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>

diff --git a/fs/Kconfig b/fs/Kconfig
index ff0e81980207a75727d9a845cf8e7fcfbfedd7ec..2553e0bbd01901d7cccd241180160446b6b608c7 100644 (file)
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -894,6 +894,58 @@ config CRAMFS
 
          If unsure, say N.
 
+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 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_EMBEDDED
+
+       bool "Additional option for memory-constrained systems" 
+       depends on SQUASHFS
+       default n
+       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.
+
 config VXFS_FS
        tristate "FreeVxFS file system support (VERITAS VxFS(TM) compatible)"
        depends on BLOCK