Subject: [PATCH 14/16] Squashfs: Kconfig entry

From: Phillip Lougher
Date: Fri Oct 17 2008 - 11:43:56 EST

Signed-off-by: Phillip Lougher <phillip@xxxxxxxxxxxxxxxxxxx>
fs/Kconfig | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 52 insertions(+), 0 deletions(-)

diff --git a/fs/Kconfig b/fs/Kconfig
index cf9db09..abbb6c2 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -1192,6 +1192,58 @@ config CRAMFS

If unsure, say N.

+config SQUASHFS
+ tristate "SquashFS 4.0 - Squashed file system support"
+ depends on BLOCK
+ 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
+ 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.
+ 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.
+ 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

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