Squashfs: add LZ4 compression

Hi

Now that LZ4 compression support is in 3.11-rc1, I have written the
following two patches for Squashfs to use it.

Phillip Lougher (2):
  Squashfs: add LZ4 compression support
  Squashfs: Add LZ4 compression configuration option

 Documentation/filesystems/squashfs.txt |    8 +-
 fs/squashfs/Kconfig                    |   15 +++
 fs/squashfs/Makefile                   |    1 +
 fs/squashfs/decompressor.c             |    7 ++
 fs/squashfs/decompressor.h             |    4 +
 fs/squashfs/lz4_wrapper.c              |  163 ++++++++++++++++++++++++++++++++
 fs/squashfs/squashfs_fs.h              |    1 +
 7 files changed, 195 insertions(+), 4 deletions(-)
 create mode 100644 fs/squashfs/lz4_wrapper.c

These patches are also available in the git tree here:

browse: https://git.kernel.org/cgit/linux/kernel/git/pkl/squashfs...
git clone: git://git.kernel.org/pub/scm/linux/kernel/git/pkl/squashfs-lz4.git

LZ4 support has (obviously) also been added to the squashfs-tools
(Mksquashfs and Unsquashfs).  This is available from the Squashfs-tools
git repository here:

browse: https://git.kernel.org/cgit/fs/squashfs/squashfs-tools.git
git clone: git://git.kernel.org/pub/scm/fs/squashfs/squashfs-tools.git

When building the squashfs-tools edit the Makefile to enable LZ4
support (by default it is disabled).

LZ4 compression can be specified by using the -comp option, e.g.
% mksquashfs xxx img.sqsh -comp lz4

The use of LZ4 high compression can be specified using -Xhc, e.g.

% mksquashfs xxx img.sqsh -comp lz4 -Xhc

Phillip
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