Squashfs: Kconfig entry

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

1 files changed, 52 insertions, 0 deletions

diff --git a/fs/Kconfig b/fs/Kconfig
index ff0e81980207..2553e0bbd019 100644
--- 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