Orangefs: kernel client introduction

From: Mike Marshall <hubcap@omnibond.com>

Here is version Three of the Orangefs kernel client patch.

Changes and who suggested them:

  * addition of this 0/X part of the series - Boaz Harrosh
  * addition of orangefs.txt file - Boaz Harrosh
  * Kconfig cleanup - Randy Dunlap
  * transition from procfs to debugfs and sysfs - Greg K-H
  * fixups to extended attribute code - Walt Ligon
  * "future proofing" of interface between kernel module and userspace.

OrangeFS is an LGPL userspace, scale-out, parallel storage system.
It is ideal for large storage problems faced by HPC, Big Data, Genomics,
Bioinformatics, Video Streaming and Rendering.

Features:

  * Distributed Metadata, including Giga+-inspired distributed metadata
    for directory entries
  * Support for multiple network infrastructures leveraging BMI to adapt
    to TCP, IB, Portals and others.
  * Stateless Servers
  * User-level Implementation
  * Multiple interface integration levels for easy system and application
    integration
  * Server-to-server collective communication for improved metadata
    operation scalability
  * Scalable, Portable and Flexible
  * Proven Research Platform
  * Integrated capability-based security
  * Extensive Documentation
  * Optimized MPI-IO Support

In addition to the Linux kernel client, OrangeFS supports multiple client
platforms and applications including: WEBDAV, S3, Windows and Hadoop
Integration

History:
OrangeFS is the third development phase of the PVFS project. PFVS was
first developed in 1993 by Walt Ligon and Eric Blumer as a parallel file
system for Parallel Virtual Machine (PVM) as part of a NASA grant to study
the I/O patterns of parallel programs. In 2001-2004 a complete rewrite
PVFS2 was developed by Walt Ligon, Phil Carnes, Pete Wyckoff, Neil Miller,
Rob Latham, Sam Lang and others, providing for many of the modern
distributed and parallel file system concepts.  Omnibond is leading the
third phase of development with the OrangeFS Community.
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