Extend decompressor framework to handle compression options stored in
the filesystem.  These options can be used by the relevant decompressor
at initialisation time to over-ride defaults.

The presence of compression options in the filesystem is indicated by
the COMP_OPT filesystem flag.  If present the data is read from the
filesystem and passed to the decompressor init function.  The decompressor
init function signature has been extended to take this data.

Also update the init function signature in the glib, lzo and xz
decompressor wrappers.
Signed-off-by: NPhillip Lougher <phillip@lougher.demon.co.uk>

Add support for reading file systems compressed with the
XZ compression algorithm.

This patch adds the XZ decompressor wrapper code.
Signed-off-by: NPhillip Lougher <phillip@lougher.demon.co.uk>

Checkpatch.pl in 2.6.34 added a check for spaces between tabs.
Signed-off-by: NPhillip Lougher <phillip@lougher.demon.co.uk>

Add new extended inode types that store the xattr_id field.
Also add the necessary code changes to make xattrs visibile.
Signed-off-by: NPhillip Lougher <phillip@lougher.demon.co.uk>

Add support for listxattr and getxattr.  Also add xattr definitions.
Signed-off-by: NPhillip Lougher <phillip@lougher.demon.co.uk>

This patch adds support for mapping xattr ids (stored in inodes)
into the on-disk location of the xattrs themselves.
Signed-off-by: NPhillip Lougher <phillip@lougher.demon.co.uk>

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

Add knowledge of lzma/lzo compression formats to the decompressor
framework.  For now these are added as unsupported.  Without
these entries lzma/lzo compressed filesystems will be flagged as
having unknown compression which is undesirable.
Signed-off-by: NPhillip Lougher <phillip@lougher.demon.co.uk>

Use the standard magic.h for btrfs and squashfs.
Signed-off-by: NQinghuang Feng <qhfeng.kernel@gmail.com>
Cc: Phillip Lougher <phillip@lougher.demon.co.uk>
Cc: Chris Mason <chris.mason@oracle.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

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