[PATCH] mkcramfs gets an option to use meta-information

[Bjorn Wesen]

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--801292794-382094757-1001946061=:14246
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[there is no maintainer listed for cramfs but the copyright says
Transmeta, so therefore I send it to you, Alan and the list]

The enclosed patch makes it possible to, by metafiles, control what
permissions and ownership the created files will get in the resulting file
system image. Previously the only way to achieve this was to create the
filesystem as root (so the original files already had the right
permissions and ownership). It is also possible to specify subdirectories
and files to be excluded or included, and to specify files to be generated
as device-files.

This functionality is very useful for building root-images for embedded
Linux etc, and nobody wants to develop as root so it's necessary as well.. 

The same metafile-format can be used in conjunction with JFFS1 and 2, but
those patches are handled separately. In the meantime, this patch also
encloses Documentation/filesystems/metafiles.txt as documentation and RFC.
The metafile itself for an embedded system can be generated automatically
by build-scripts which wrap the "install" command, for example.

If no metafile is specified, the behaviour is exactly as before.

Another option needed for cross-development using mkcramfs is also added,
to override the default page-size used for the image (for example, in our
systems we need a target page-size of 8192, but mkcramfs.c normally is
hardcoded to 4096). Default is as before 4096.

/Bjorn

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