Read Me

/************************************************************/
/************                              ******************/
/************             FSFIPI           ******************/
/************                              ******************/
/************************************************************/

FSFIPI - FileSystem FIlter PIpeline

is a sytem, to modify the behaviour of filesystem by a pipeline of filters.
These filters are implemented through modules, loaded in run-time by fsfipi
binary, after start.

Modules are shared libraries with name of form `fsfipi_<module_name>.so'

fsfipi usage:
      fsfipi\
         -- <module1_name> <module1_parameters>\
         [ -- <module2_name> <module1_parameters> [ -- ... ] ]
module names are without `fsfipi_'
parameter beginning with `--' can be passed to module by prefixing
   it with another `-'

The first module is in the highest layer, the last in the lowest.


Currently, these modules are available in this distribution:
frontend:
   fuse_interface - implements an fuse filesystem. Takes arguments for fusermount.
                    Read http://fuse.sourceforge.net/ for details.
backend:
   localfs - just connects the pipeline to the real filesystem.
             Usually it is used in combination with the subtree module.

filters:
   subtree - add a directory prefix to all used paths, i.e. if the prefix is
             `/mnt/disk' and a higher layer (filter) would like to perform an
             operation on the file `/abc/def' (relative to the filesystem mountpoint),
             an request for that operation with file `/mnt/disk/abc/def' will be send
             to the lower layer. Actually it is staticly linked to fsfipi_rename, and
             implements only renaming function.
   debug   - prints debug information (requests and their results). Without parametr, it
             does nothing real and returns 0. If it has a parameter, this will be used
             as a prefix of the debug messages, and requests are passed unchanged to
             the lower layer.
   vaves   - revolutionary versioning system.

Copyright:
  In fact, what makes the interface is licensed under GNU/LGPL (see COPYING.LIB)
and others under GNU/GPL (see COPYING).

Author:
  Václav Jůza, 2005

Used some code and comments from FUSE by Miklos Szeredi, mainly from file fuse.h
and fusexmp.h.

Inspired also by:
  PlasticFS (http://plasticfs.sourceforge.net/), author Peter Miller
   (And maybe, I will make an interface to this system in the future).