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Versions: (draft-ellard-nfsv4-federated-fs-admin) 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 Draft is active
In: MissingRef
NFSv4 Working Group                                           J. Lentini
Internet-Draft                                               C. Everhart
Intended status: Standards Track                                  NetApp
Expires: March 29, 2013                                        D. Ellard
                                               Raytheon BBN Technologies
                                                               R. Tewari
                                                                 M. Naik
                                                             IBM Almaden
                                                      September 25, 2012


           Administration Protocol for Federated Filesystems
                 draft-ietf-nfsv4-federated-fs-admin-12

Abstract

   This document describes the administration protocol for a federated
   file system that enables file access and namespace traversal across
   collections of independently administered fileservers.  The protocol
   specifies a set of interfaces by which fileservers with different
   administrators can form a fileserver federation that provides a
   namespace composed of the filesystems physically hosted on and
   exported by the constituent fileservers.

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on March 29, 2013.

Copyright Notice



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   Copyright (c) 2012 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.



























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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  5
     1.1.  Definitions  . . . . . . . . . . . . . . . . . . . . . . .  5
   2.  Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . .  7
   3.  Error Values . . . . . . . . . . . . . . . . . . . . . . . . . 13
   4.  Data Types . . . . . . . . . . . . . . . . . . . . . . . . . . 16
     4.1.  FedFsNsdbName Equality . . . . . . . . . . . . . . . . . . 18
   5.  Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . 18
     5.1.  FEDFS_NULL . . . . . . . . . . . . . . . . . . . . . . . . 19
       5.1.1.  Synopsis . . . . . . . . . . . . . . . . . . . . . . . 19
       5.1.2.  Description  . . . . . . . . . . . . . . . . . . . . . 19
       5.1.3.  Errors . . . . . . . . . . . . . . . . . . . . . . . . 19
     5.2.  FEDFS_CREATE_JUNCTION  . . . . . . . . . . . . . . . . . . 19
       5.2.1.  Synopsis . . . . . . . . . . . . . . . . . . . . . . . 19
       5.2.2.  Description  . . . . . . . . . . . . . . . . . . . . . 19
       5.2.3.  Errors . . . . . . . . . . . . . . . . . . . . . . . . 21
     5.3.  FEDFS_DELETE_JUNCTION  . . . . . . . . . . . . . . . . . . 21
       5.3.1.  Synopsis . . . . . . . . . . . . . . . . . . . . . . . 21
       5.3.2.  Description  . . . . . . . . . . . . . . . . . . . . . 21
       5.3.3.  Errors . . . . . . . . . . . . . . . . . . . . . . . . 22
     5.4.  FEDFS_LOOKUP_JUNCTION  . . . . . . . . . . . . . . . . . . 23
       5.4.1.  Synopsis . . . . . . . . . . . . . . . . . . . . . . . 23
       5.4.2.  Description  . . . . . . . . . . . . . . . . . . . . . 23
       5.4.3.  Errors . . . . . . . . . . . . . . . . . . . . . . . . 25
     5.5.  FEDFS_CREATE_REPLICATION . . . . . . . . . . . . . . . . . 26
       5.5.1.  Synopsis . . . . . . . . . . . . . . . . . . . . . . . 26
       5.5.2.  Description  . . . . . . . . . . . . . . . . . . . . . 26
       5.5.3.  Errors . . . . . . . . . . . . . . . . . . . . . . . . 27
     5.6.  FEDFS_DELETE_REPLICATION . . . . . . . . . . . . . . . . . 28
       5.6.1.  Synopsis . . . . . . . . . . . . . . . . . . . . . . . 28
       5.6.2.  Description  . . . . . . . . . . . . . . . . . . . . . 28
       5.6.3.  Errors . . . . . . . . . . . . . . . . . . . . . . . . 29
     5.7.  FEDFS_LOOKUP_REPLICATION . . . . . . . . . . . . . . . . . 29
       5.7.1.  Synopsis . . . . . . . . . . . . . . . . . . . . . . . 29
       5.7.2.  Description  . . . . . . . . . . . . . . . . . . . . . 29
       5.7.3.  Errors . . . . . . . . . . . . . . . . . . . . . . . . 30
     5.8.  FEDFS_SET_NSDB_PARAMS  . . . . . . . . . . . . . . . . . . 30
       5.8.1.  Synopsis . . . . . . . . . . . . . . . . . . . . . . . 30
       5.8.2.  Description  . . . . . . . . . . . . . . . . . . . . . 31
       5.8.3.  Errors . . . . . . . . . . . . . . . . . . . . . . . . 31
     5.9.  FEDFS_GET_NSDB_PARAMS  . . . . . . . . . . . . . . . . . . 32
       5.9.1.  Synopsis . . . . . . . . . . . . . . . . . . . . . . . 32
       5.9.2.  Description  . . . . . . . . . . . . . . . . . . . . . 32
       5.9.3.  Errors . . . . . . . . . . . . . . . . . . . . . . . . 32
     5.10. FEDFS_GET_LIMITED_NSDB_PARAMS  . . . . . . . . . . . . . . 32
       5.10.1. Synopsis . . . . . . . . . . . . . . . . . . . . . . . 33
       5.10.2. Description  . . . . . . . . . . . . . . . . . . . . . 33



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       5.10.3. Errors . . . . . . . . . . . . . . . . . . . . . . . . 33
   6.  Security Considerations  . . . . . . . . . . . . . . . . . . . 34
   7.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 34
   8.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 35
     8.1.  Normative References . . . . . . . . . . . . . . . . . . . 35
     8.2.  Informative References . . . . . . . . . . . . . . . . . . 35
   Appendix A.  Acknowledgments . . . . . . . . . . . . . . . . . . . 36
   Appendix B.  RFC Editor Notes  . . . . . . . . . . . . . . . . . . 37
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 37










































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1.  Introduction

   A federated filesystem enables file access and namespace traversal in
   a uniform, secure and consistent manner across multiple independent
   fileservers within an enterprise (and possibly across multiple
   enterprises) with reasonably good performance.

   Traditionally, building a namespace that spans multiple fileservers
   has been difficult for two reasons.  First, the fileservers that
   export pieces of the namespace are often not in the same
   administrative domain.  Second, there is no standard mechanism for
   the fileservers to cooperatively present the namespace.  Fileservers
   might provide proprietary management tools and in some cases an
   administrator might be able to use the proprietary tools to build a
   shared namespace out of the exported filesystems.  Relying on vendor-
   proprietary tools does not work in larger enterprises or when
   collaborating across enterprises because it is likely that the system
   will contain fileservers running different software, each with their
   own protocols, with no common protocol to manage the namespace or
   exchange namespace information.

   The requirements for federated namespaces are described in [RFC5716].

   The filesystem federation protocol described in [FEDFS-NSDB] allows
   fileservers from different vendors and/or with different
   administrators to cooperatively build a namespace.

   This document describes the protocol used by administrators to
   configure the fileservers and construct the namespace.

1.1.  Definitions

   Administrator:  An user with the necessary authority to initiate
      administrative tasks on one or more servers.

   Admin Entity:  A server or agent that administers a collection of
      fileservers and persistently stores the namespace information.

   Client:  Any client that accesses the fileserver data using a
      supported filesystem access protocol.

   Federation:  A set of server collections and singleton servers that
      use a common set of interfaces and protocols in order to provide
      to their clients a federated namespace accessible through a
      filesystem access protocol.






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   Fileserver:  A server exporting a filesystem via a network filesystem
      access protocol.

   Fileset:  The abstraction of a set of files and the directory tree
      that contains them.  A fileset is the fundamental unit of data
      management in the federation.

      Note that all files within a fileset are descendants of one
      directory, and that filesets do not span filesystems.

   Filesystem:  A self-contained unit of export for a fileserver, and
      the mechanism used to implement filesets.  The fileset does not
      need to be rooted at the root of the filesystem, nor at the export
      point for the filesystem.

      A single filesystem MAY implement more than one fileset, if the
      client protocol and the fileserver permit this.

   Filesystem Access Protocol:  A network filesystem access protocol
      such as NFSv3 [RFC1813], NFSv4 [3530bis], or CIFS (Common Internet
      File System) [MS-SMB] [MS-SMB2] [MS-CIFS].

   FSL (Fileset Location):  The location of the implementation of a
      fileset at a particular moment in time.  An FSL MUST be something
      that can be translated into a protocol-specific description of a
      resource that a client can access directly, such as an fs_location
      (for NFSv4), or share name (for CIFS).  Note that not all FSLs
      need to be explicitly exported as long as they are contained
      within an exported path on the fileserver.

   FSN (Fileset Name):  A platform-independent and globally unique name
      for a fileset.  Two FSLs that implement replicas of the same
      fileset MUST have the same FSN, and if a fileset is migrated from
      one location to another, the FSN of that fileset MUST remain the
      same.

   Junction:  A filesystem object used to link a directory name in the
      current fileset with an object within another fileset.  The
      server-side "link" from a leaf node in one fileset to the root of
      another fileset.

   Namespace:  A filename/directory tree that a sufficiently authorized
      client can observe.

   NSDB (Namespace Database) Service:  A service that maps FSNs to FSLs.
      The NSDB may also be used to store other information, such as
      annotations for these mappings and their components.




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   NSDB Node:  The name or location of a server that implements part of
      the NSDB service and is responsible for keeping track of the FSLs
      (and related info) that implement a given partition of the FSNs.

   Referral:  A server response to a client access that directs the
      client to evaluate the current object as a reference to an object
      at a different location (specified by an FSL) in another fileset,
      and possibly hosted on another fileserver.  The client re-attempts
      the access to the object at the new location.

   Replica:  A replica is a redundant implementation of a fileset.  Each
      replica shares the same FSN, but has a different FSL.

      Replicas may be used to increase availability or performance.
      Updates to replicas of the same fileset MUST appear to occur in
      the same order, and therefore each replica is self-consistent at
      any moment.

      We do not assume that updates to each replica occur
      simultaneously.  If a replica is offline or unreachable, the other
      replicas may be updated.

   Server Collection:  A set of fileservers administered as a unit.  A
      server collection may be administered with vendor-specific
      software.

      The namespace provided by a server collection could be part of the
      federated namespace.

   Singleton Server:  A server collection containing only one server; a
      stand-alone fileserver.


2.  Protocol

   The RPC protocol used by the administration operations is ONC RPC
   [RFC5531].  The data structures used for the parameters and return
   values of these procedures are expressed in this document in XDR
   [RFC4506].

   The XDR definitions below are formatted to allow the reader to easily
   extract them from the document.  The reader can use the following
   shell script to extract the definitions:








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             <CODE BEGINS>

             #!/bin/sh
             grep '^ *///' | sed 's?^ */// ??' | sed 's?^ *///$??'

             <CODE ENDS>


   If the above script is stored in a file called "extract.sh", and this
   document is in a file called "spec.txt", then the reader can do:


             <CODE BEGINS>

             sh extract.sh < spec.txt > admin1.xdr

             <CODE ENDS>


   The effect of the script is to remove leading white space from each
   line, plus a sentinel sequence of "///".

   The protocol definition in XDR notation is shown below.  We begin by
   defining basic constants and structures used by the protocol.  We
   then present the procedures defined by the protocol.

   <CODE BEGINS>


    /// /*
    ///  * Copyright (c) 2010-2012 IETF Trust and the persons identified
    ///  * as authors of the code.  All rights reserved.
    ///  *
    ///  * The authors of the code are the authors of
    ///  * [draft-ietf-nfsv4-federated-fs-admin-xx.txt]: J. Lentini,
    ///  * C. Everhart, D. Ellard, R. Tewari, and M. Naik.
    ///  *
    ///  * Redistribution and use in source and binary forms, with
    ///  * or without modification, are permitted provided that the
    ///  * following conditions are met:
    ///  *
    ///  * - Redistributions of source code must retain the above
    ///  *   copyright notice, this list of conditions and the
    ///  *   following disclaimer.
    ///  *
    ///  * - Redistributions in binary form must reproduce the above
    ///  *   copyright notice, this list of conditions and the
    ///  *   following disclaimer in the documentation and/or other



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    ///  *   materials provided with the distribution.
    ///  *
    ///  * - Neither the name of Internet Society, IETF or IETF
    ///  *   Trust, nor the names of specific contributors, may be
    ///  *   used to endorse or promote products derived from this
    ///  *   software without specific prior written permission.
    ///  *
    ///  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS
    ///  *   AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
    ///  *   WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    ///  *   IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
    ///  *   FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
    ///  *   EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
    ///  *   LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
    ///  *   EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
    ///  *   NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
    ///  *   SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
    ///  *   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
    ///  *   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
    ///  *   OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
    ///  *   IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
    ///  *   ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    ///  */
    ///
    /// enum FedFsStatus {
    ///  FEDFS_OK                                 = 0,
    ///  FEDFS_ERR_ACCESS                         = 1,
    ///  FEDFS_ERR_BADCHAR                        = 2,
    ///  FEDFS_ERR_BADNAME                        = 3,
    ///  FEDFS_ERR_NAMETOOLONG                    = 4,
    ///  FEDFS_ERR_LOOP                           = 5,
    ///  FEDFS_ERR_BADXDR                         = 6,
    ///  FEDFS_ERR_EXIST                          = 7,
    ///  FEDFS_ERR_INVAL                          = 8,
    ///  FEDFS_ERR_IO                             = 9,
    ///  FEDFS_ERR_NOSPC                          = 10,
    ///  FEDFS_ERR_NOTJUNCT                       = 11,
    ///  FEDFS_ERR_NOTLOCAL                       = 12,
    ///  FEDFS_ERR_PERM                           = 13,
    ///  FEDFS_ERR_ROFS                           = 14,
    ///  FEDFS_ERR_SVRFAULT                       = 15,
    ///  FEDFS_ERR_NOTSUPP                        = 16,
    ///  FEDFS_ERR_NSDB_ROUTE                     = 17,
    ///  FEDFS_ERR_NSDB_DOWN                      = 18,
    ///  FEDFS_ERR_NSDB_CONN                      = 19,
    ///  FEDFS_ERR_NSDB_AUTH                      = 20,
    ///  FEDFS_ERR_NSDB_LDAP                      = 21,
    ///  FEDFS_ERR_NSDB_LDAP_VAL                  = 22,



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    ///  FEDFS_ERR_NSDB_NONCE                     = 23,
    ///  FEDFS_ERR_NSDB_NOFSN                     = 24,
    ///  FEDFS_ERR_NSDB_NOFSL                     = 25,
    ///  FEDFS_ERR_NSDB_RESPONSE                  = 26,
    ///  FEDFS_ERR_NSDB_FAULT                     = 27,
    ///  FEDFS_ERR_NSDB_PARAMS                    = 28,
    ///  FEDFS_ERR_NSDB_LDAP_REFERRAL             = 29,
    ///  FEDFS_ERR_NSDB_LDAP_REFERRAL_VAL         = 30,
    ///  FEDFS_ERR_NSDB_LDAP_REFERRAL_NOTFOLLOWED = 31,
    ///  FEDFS_ERR_NSDB_PARAMS_LDAP_REFERRAL      = 32,
    ///  FEDFS_ERR_PATH_TYPE_UNSUPP               = 33,
    ///  FEDFS_ERR_DELAY                          = 34,
    ///  FEDFS_ERR_NO_CACHE                       = 35,
    ///  FEDFS_ERR_UNKNOWN_CACHE                  = 36,
    ///  FEDFS_ERR_NO_CACHE_UPDATE                = 37
    /// };
    ///
    /// typedef opaque                 utf8string<>;
    /// typedef utf8string             ascii_REQUIRED4;
    /// typedef utf8string             utf8val_REQUIRED4;
    ///
    /// typedef opaque FedFsUuid[16];
    ///
    /// struct FedFsNsdbName {
    ///         unsigned int           port;
    ///         utf8val_REQUIRED4      hostname;
    /// };
    ///
    /// typedef ascii_REQUIRED4 FedFsPathComponent;
    /// typedef FedFsPathComponent FedFsPathName<>;
    ///
    /// struct FedFsFsn {
    ///         FedFsUuid              fsnUuid;
    ///         FedFsNsdbName          nsdbName;
    /// };
    ///
    /// enum FedFsFslType {
    ///  FEDFS_NFS_FSL = 0
    ///  /* other types TBD */
    /// };
    ///
    /// struct FedFsNfsFsl {
    ///         FedFsUuid              fslUuid;
    ///         unsigned int           port;
    ///         utf8val_REQUIRED4      hostname;
    ///         FedFsPathName          path;
    /// };
    ///



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    /// union FedFsFsl switch(FedFsFslType type) {
    ///  case FEDFS_NFS_FSL:
    ///         FedFsNfsFsl            nfsFsl;
    /// };
    ///
    /// enum FedFsPathType {
    ///  FEDFS_PATH_SYS = 0,
    ///  FEDFS_PATH_NFS = 1
    ///  /* other types TBD */
    /// };
    ///
    /// union FedFsPath switch(FedFsPathType type) {
    ///  case FEDFS_PATH_SYS: /* administrative path */
    ///         FedFsPathName          adminPath;
    ///  case FEDFS_PATH_NFS: /* NFS namespace path */
    ///         FedFsPathName          nfsPath;
    /// };
    ///
    /// struct FedFsCreateArgs {
    ///         FedFsPath              path;
    ///         FedFsFsn               fsn;
    /// };
    ///
    /// enum FedFsResolveType {
    ///  FEDFS_RESOLVE_NONE  = 0,
    ///  FEDFS_RESOLVE_CACHE = 1,
    ///  FEDFS_RESOLVE_NSDB  = 2
    /// };
    ///
    /// struct FedFsLookupArgs {
    ///         FedFsPath              path;
    ///         FedFsResolveType       resolve;
    /// };
    ///
    /// struct FedFsLookupResOk {
    ///         FedFsFsn               fsn;
    ///         FedFsFsl               fsl<>;
    /// };
    ///
    /// struct FedFsLookupResReferralVal {
    ///         FedFsNsdbName          targetNsdb;
    ///         unsigned int           ldapResultCode;
    /// };
    ///
    /// union FedFsLookupRes switch (FedFsStatus status) {
    ///  case FEDFS_OK:
    ///  case FEDFS_ERR_NO_CACHE_UPDATE:
    ///         FedFsLookupResOk           resok;



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    ///  case FEDFS_ERR_NSDB_LDAP_VAL:
    ///         unsigned int               ldapResultCode;
    ///  case FEDFS_ERR_NSDB_LDAP_REFERRAL:
    ///  case FEDFS_ERR_NSDB_PARAMS_LDAP_REFERRAL:
    ///         FedFsNsdbName              targetNsdb;
    ///  case FEDFS_ERR_NSDB_LDAP_REFERRAL_VAL:
    ///         FedFsLookupResReferralVal  resReferralVal;
    ///  default:
    ///         void;
    /// };
    ///
    /// enum FedFsConnectionSec {
    ///  FEDFS_SEC_NONE = 0,
    ///  FEDFS_SEC_TLS = 1 /* StartTLS mechanism; RFC4513, Section 3 */
    ///  /* other mechanisms TBD */
    /// };
    ///
    /// union FedFsNsdbParams switch (FedFsConnectionSec secType) {
    ///  case FEDFS_SEC_TLS:
    ///         opaque                   secData<>;
    ///  default:
    ///         void;
    /// };
    ///
    /// struct FedFsSetNsdbParamsArgs {
    ///         FedFsNsdbName            nsdbName;
    ///         FedFsNsdbParams          params;
    /// };
    ///
    /// union FedFsGetNsdbParamsRes switch (FedFsStatus status) {
    ///  case FEDFS_OK:
    ///         FedFsNsdbParams          params;
    ///  default:
    ///         void;
    /// };
    ///
    /// union FedFsGetLimitedNsdbParamsRes switch (FedFsStatus status) {
    ///  case FEDFS_OK:
    ///         FedFsConnectionSec       secType;
    ///  default:
    ///         void;
    /// };
    ///
    /// program FEDFS_PROG {
    ///  version FEDFS_V1 {
    ///      void FEDFS_NULL(void) = 0;
    ///      FedFsStatus FEDFS_CREATE_JUNCTION(
    ///                   FedFsCreateArgs) = 1;



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    ///      FedFsStatus FEDFS_DELETE_JUNCTION(
    ///                   FedFsPath) = 2;
    ///      FedFsLookupRes FEDFS_LOOKUP_JUNCTION(
    ///                   FedFsLookupArgs) = 3;
    ///      FedFsStatus FEDFS_CREATE_REPLICATION(
    ///                   FedFsCreateArgs) = 7;
    ///      FedFsStatus FEDFS_DELETE_REPLICATION(
    ///                   FedFsPath) = 8;
    ///      FedFsLookupRes FEDFS_LOOKUP_REPLICATION(
    ///                   FedFsLookupArgs) = 9;
    ///      FedFsStatus FEDFS_SET_NSDB_PARAMS(
    ///                   FedFsSetNsdbParamsArgs) = 4;
    ///      FedFsGetNsdbParamsRes FEDFS_GET_NSDB_PARAMS(
    ///                   FedFsNsdbName) = 5;
    ///      FedFsGetLimitedNsdbParamsRes FEDFS_GET_LIMITED_NSDB_PARAMS(
    ///                   FedFsNsdbName) = 6;
    ///  } = 1;
    /// } = 100418;

   <CODE ENDS>


3.  Error Values

   The results of successful operations will consist of a status of
   FEDFS_OK.  The results of unsuccessful operations will begin with a
   status, other than FEDFS_OK, that indicates the reason why the
   operation failed.

   Many of the error status names and meanings (and the prose for their
   descriptions) are taken from the specification for NFSv4 [3530bis].
   Note, however, that the numeric values for the status codes are
   different.  For example, the name and meaning of FEDFS_ERR_ACCESS was
   inspired by NFSv4's NFS4ERR_ACCESS, but their numeric values are
   different.

   The status of an unsuccessful operation will generally only indicate
   the first error encountered during the attempt to execute the
   operation.

   FEDFS_OK:  No errors were encountered.  The operation was a success.

   FEDFS_ERR_ACCESS:  Permission denied.  The caller does not have the
      correct permission to perform the requested operation.







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   FEDFS_ERR_BADCHAR:  A UTF-8 string contains a character which is not
      supported by the server in the context in which it being used.

   FEDFS_ERR_BADNAME:  A name string in a request consisted of valid
      UTF-8 characters supported by the server, but the name is not
      supported by the server as a valid name for the current operation.

   FEDFS_ERR_NAMETOOLONG:  Returned when the pathname in an operation
      exceeds the server's implementation limit.

   FEDFS_ERR_LOOP:  Returned when too many symbolic links were
      encountered in resolving pathname.

   FEDFS_ERR_BADXDR:  The server encountered an XDR decoding error while
      processing an operation.

   FEDFS_ERR_EXIST:  The junction specified already exists.

   FEDFS_ERR_INVAL:  Invalid argument for an operation.

   FEDFS_ERR_IO:  A hard error occurred while processing the requested
      operation.

   FEDFS_ERR_NOSPC:  The requested operation would have caused the
      server's filesystem to exceed some limit (for example, if there is
      a fixed number of junctions per fileset or per server).

   FEDFS_ERR_NOTJUNCT:  The caller specified a path that does not end in
      a junction as the operand for an operation that requires the last
      component of the path to be a junction.

   FEDFS_ERR_NOTLOCAL:  The caller specified a path that contains a
      junction in any position other than the last component.

   FEDFS_ERR_PERM:  The operation was not allowed because the caller is
      either not a privileged user or not the owner of an object that
      would be modified by the operation.

   FEDFS_ERR_ROFS:  A modifying operation was attempted on a read-only
      filesystem.

   FEDFS_ERR_SVRFAULT:  An unanticipated non-protocol error occurred on
      the server.

   FEDFS_ERR_NSDB_ROUTE:  The fileserver was unable to find a route to
      the NSDB.





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   FEDFS_ERR_NSDB_DOWN:  The fileserver determined that the NSDB was
      down.

   FEDFS_ERR_NSDB_CONN:  The fileserver was unable to establish a
      connection with the NSDB.

   FEDFS_ERR_NSDB_AUTH:  The fileserver was unable to authenticate and
      establish a secure connection with the NSDB.

   FEDFS_ERR_NSDB_LDAP:  An LDAP error occurred on the connection
      between the fileserver and NSDB.

   FEDFS_ERR_NSDB_LDAP_VAL:  Indicates the same error as
      FEDFS_ERR_NSDB_LDAP, and allows the LDAP protocol error value to
      be returned back to the client.

   FEDFS_ERR_NSDB_NONCE:  The fileserver was unable to locate the NCE in
      the appropriate NSDB.

   FEDFS_ERR_NSDB_NOFSN:  The fileserver was unable to locate the given
      FSN in the appropriate NSDB.

   FEDFS_ERR_NSDB_NOFSL:  The fileserver was unable to locate any FSLs
      for the given FSN in the appropriate NSDB.

   FEDFS_ERR_NSDB_RESPONSE:  The fileserver received a malformed
      response from the NSDB.  This includes situations when an NSDB
      entry (e.g., FSN or FSL) is missing a required attribute.

   FEDFS_ERR_NSDB_FAULT:  An unanticipated error related to the NSDB
      occurred.

   FEDFS_ERR_NSDB_PARAMS:  The fileserver does not have any connection
      parameters on record for the specified NSDB.

   FEDFS_ERR_NSDB_LDAP_REFERRAL:  The fileserver received an LDAP
      referral that it was unable to follow.

   FEDFS_ERR_NSDB_LDAP_REFERRAL_VAL:  Indicates the same error as
      FEDFS_ERR_NSDB_LDAP_REFERRAL, and allows the LDAP protocol error
      value to be returned back to the client.

   FEDFS_ERR_NSDB_LDAP_REFERRAL_NOTFOLLOWED:  The fileserver received an
      LDAP referral that it chose not to follow, either because the
      fileserver does not support following LDAP referrals or LDAP
      referral following is disabled.





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   FEDFS_ERR_NSDB_PARAMS_LDAP_REFERRAL:  The fileserver received an LDAP
      referral that it chose not to follow because the fileserver had no
      NSDB parameters for the NSDB targeted by the LDAP referral.

   FEDFS_ERR_PATH_TYPE_UNSUPP:  The fileserver does not support the
      specified FedFsPathType value.

   FEDFS_ERR_NOTSUPP:  The fileserver does not support the specified
      procedure.

   FEDFS_ERR_DELAY:  The fileserver initiated the request, but was not
      able to complete it in a timely fashion.  The client should wait
      and then try the request with a new RPC transaction ID.

   FEDFS_ERR_NO_CACHE:  The fileserver does not implement an FSN-to-FSL
      cache.

   FEDFS_ERR_UNKNOWN_CACHE:  The software receiving the ONC RPC request
      is unaware if the fileserver implements an FSN-to-FSL cache or
      unable to communicate with the FSN-to-FSL cache if it exists.

   FEDFS_ERR_NO_CACHE_UPDATE:  The fileserver was unable to update its
      FSN-to-FSL cache.


4.  Data Types

   The basic data types defined above MUST be formatted as follows:

   FedFsUuid:  A universally unique identifier (UUID) as described in
      [RFC4122] as a version 4 UUID.  The UUID should be formatted in
      network byte order.

   FedFsNsdbName:  A (hostname, port) pair.

      The hostname is a variable length UTF-8 string that represents an
      NSDB's network location in DNS name notation.  It SHOULD be
      prepared using the server4 rules defined in Chapter 12
      "Internationalization" of [3530bis].  The DNS name MUST be
      represented using a fully qualified domain name.  A system (i.e.,
      fileserver or administrative host) SHOULD resolve the fully
      qualified domain name to a network address using the system's
      standard resolution mechanisms.

      The port value in the FedFsNsdbName indicates the LDAP port on the
      NSDB (see [RFC4511]).  The value MUST be in the range 0 to 65535.
      A value of 0 indicates that the standard LDAP port number, 389,
      SHOULD be assumed.



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      FSNs are immutable and invariant.  The attributes of an FSN,
      including the fedfsNsdbName, are expected to remain constant.
      Therefore, a FedFsNsdbName SHOULD NOT contain a network address,
      such as an IPv4 or IPv6 address, as this would indefinitely assign
      the network address.

   FedFsPathComponent:  A case sensitive UTF-8 string containing a
      filesystem path component.  It SHOULD be prepared using the
      component4 rules defined in Chapter 12 "Internationalization" of
      [3530bis].

   FedFsPathName:  A variable length array of FedFsPathComponent values
      representing a filesystem path.  The path's first component is
      stored at the first position of the array, the second component is
      stored at the second position of the array, and so on.

      The path "/" MUST be encoded as an array with zero components.

      A FedFsPathName MUST NOT contain any zero-length components.

   FedFsPath:  A pathname container.  The format and semantics of the
      pathname are defined by the FedFsPathType value.

   FedFsPathType:  The type specific description of a pathname.

      A FEDFS_PATH_SYS is an implementation dependent administrative
      pathname.  For example, it could be a local file system path.

      A FEDFS_PATH_NFS is a pathname in the NFSv4 server's single-server
      namespace.

   FedFsNsdbParams:  A set of parameters for connecting to an NSDB.
      Conceptually the fileserver contains a data structure that maps an
      NSDB name (DNS name and port value) to these LDAP connection
      parameters.

      The secType field indicates the security mechanism that MUST be
      used to protect all connections to the NSDB with the connection
      parameters.

      A value of FEDFS_SEC_NONE indicates that no security mechanism is
      necessary.  In this case, the secData array will have 0 length.

      A value of FEDFS_SEC_TLS indicates that the StartTLS security
      mechanism [RFC4513] MUST be used to protect all connections to the
      NSDB.  In this case, the secData array will contain an X.509v3
      root certificate in binary DER format [RFC5280] fulfilling the TLS
      requirement that root keys be distributed independently from the



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      TLS protocol.  The certificate MUST be used by the fileserver as a
      Trust Anchor to validate the NSDB's TLS server certificate list
      chain (see section 7.4.2 of [RFC5246]) and thus authenticate the
      identitiy of the NSDB.  The certificate could be that of a
      certificate authority or a self-signed certificate.

4.1.  FedFsNsdbName Equality

   Two FedFsNsdbNames are considered equal if both their DNS name and
   port values are the same.  As described above, the standard LDAP port
   number, 389, SHOULD be assumed if a port number of 0 is specified.
   Therefore, the FedFsNsdbName "(nsdb.example.com, 0)" is considered
   equal to "(nsdb.example.com, 389)" but not equal to
   "(nsdb.example.com, 1066)" since the port number is different or
   "(nsdb.foo.example.com, 389)" since the DNS name is different.


5.  Procedures

   The procedures defined in Section 2 are described in detail in the
   following sections.

   Fileservers that participate as "internal" nodes in the federated
   namespace MUST implement the following procedures:

      FEDFS_NULL
      FEDFS_CREATE_JUNCTION
      FEDFS_DELETE_JUNCTION
      FEDFS_LOOKUP_JUNCTION
      FEDFS_SET_NSDB_PARAMS
      FEDFS_GET_NSDB_PARAMS
      FEDFS_GET_LIMITED_NSDB_PARAMS

   and SHOULD implement the following procedures:

      FEDFS_CREATE_REPLICATION
      FEDFS_DELETE_REPLICATION
      FEDFS_LOOKUP_REPLICATION

   Fileservers that participate as "leaf" nodes in the namespace (i.e.,
   fileservers that host filesets that are the target of junctions, but
   that do not contain any junctions) are not required to implement any
   of these operations.

   Operations that modify the state of a replicated fileset MUST result
   in the update of all of the replicas in a consistent manner.  Ideally
   all of the replicas SHOULD be updated before any operation returns.
   If one or more of the replicas are unavailable, the operation MAY



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   succeed, but the changes MUST be applied before the unavailable
   replicas are brought back online.  We assume that replicas are
   updated via some protocol that permits state changes to be reflected
   consistently across the set of replicas in such a manner that the
   replicas will converge to a consistent state within a bounded number
   of successful message exchanges between the servers hosting the
   replicas.

5.1.  FEDFS_NULL

5.1.1.  Synopsis

   The standard NULL procedure.

5.1.2.  Description

   The null RPC, which is included, by convention, in every ONC RPC
   protocol.  This procedure does not take any arguments and does not
   produce a result.

5.1.3.  Errors

      None.

5.2.  FEDFS_CREATE_JUNCTION

5.2.1.  Synopsis

   Create a new junction from some location on the server (defined as a
   pathname) to an FSN.

5.2.2.  Description

   This operation creates a junction from a server-relative path to a
   (potentially) remote fileset named by the given FSN.

   The junction directory on the server is identified by a pathname in
   the form of an array of one or more UTF-8 path component strings.  It
   is not required that this path be accessible in any other manner
   (e.g., to a client).  This path does not appear in the federated
   namespace, except by coincidence; there is no requirement that the
   global namespace parallel the server namespace, nor is it required
   that this path be relative to the server pseudo-root.  It does not
   need to be a path that is accessible via NFS (although the junction
   will be of limited utility if the directory specified by the path is
   not also accessible via NFS).

   If the fileset is read-only, then this operation MUST indicate this



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   with a status of FEDFS_ERR_ROFS.

   If the path contains an invalid UTF-8 character, then status
   FEDFS_ERR_BADCHAR MUST be returned.

   The path is REQUIRED to exist and be completely local to the server.
   It MUST NOT contain a junction.  If the last component of the path is
   a junction (i.e., this operation is attempting to create a junction
   where one already exists), then this operation MUST return the error
   FEDFS_ERR_EXIST (even if the requested junction is identical to the
   current junction).  If any other component of the path is a junction,
   then this operation MUST fail with status FEDFS_ERR_NOTLOCAL.  The
   path might contain a symbolic link (if supported by the local
   server), but the traversal of the path MUST remain within the server-
   local namespace.

   If any component of the path does not exist, then the operation fails
   with status FEDFS_ERR_INVAL.

   The server MAY enforce the local permissions on the path, including
   the final component.  If the path cannot be traversed because of
   insufficient permissions, or the final component is an unexecutable
   or unwritable directory, then the operation MAY fail with status
   FEDFS_ERR_ACCESS.

   The operation SHOULD fail with status FEDFS_ERR_NSDB_PARAMS if the
   fileserver does not have any connection parameters on record for the
   specified NSDB.

   The association between the path and the FSN MUST be durable before
   the operation returns successfully.  If the operation return codes
   indicates success, then the junction was successfully created and is
   immediately accessible.

   If successful, subsequent references via NFSv4 [3530bis] or NFSv4.1
   [RFC5661] clients to the directory that has been replaced by the
   junction will result in a referral to a current location of the
   target fileset [FEDFS-NSDB].

   The effective permissions of the directory that is converted, by this
   operation, into a junction are the permissions of the root directory
   of the target fileset.  The original permissions of the directory
   (and any other attributes it might have) are subsumed by the
   junction.

   This operation does not create a fileset at the location targeted by
   the junction.  If the target fileset does not exist, the junction
   will still be created.  An NFS client will discover the missing



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   fileset when it traverses the junction.

5.2.3.  Errors

      FEDFS_ERR_ACCESS
      FEDFS_ERR_BADCHAR
      FEDFS_ERR_BADNAME
      FEDFS_ERR_NAMETOOLONG
      FEDFS_ERR_LOOP
      FEDFS_ERR_BADXDR
      FEDFS_ERR_EXIST
      FEDFS_ERR_INVAL
      FEDFS_ERR_IO
      FEDFS_ERR_NOSPC
      FEDFS_ERR_NOTLOCAL
      FEDFS_ERR_PERM
      FEDFS_ERR_ROFS
      FEDFS_ERR_SVRFAULT
      FEDFS_ERR_PATH_TYPE_UNSUPP
      FEDFS_ERR_NOTSUPP
      FEDFS_ERR_DELAY

5.3.  FEDFS_DELETE_JUNCTION

5.3.1.  Synopsis

   Delete an existing junction from some location on the server (defined
   as a pathname).

5.3.2.  Description

   This operation removes a junction specified by a server-relative
   path.

   As with FEDFS_CREATE_JUNCTION, the junction on the server is
   identified by a pathname in the form of an array of one or more UTF-8
   path component strings.  It is not required that this path be
   accessible in any other manner (e.g., to a client).  This path does
   not appear in the federated namespace, except by coincidence; there
   is no requirement that the global namespace reflect the server
   namespace, nor is it required that this path be relative to the
   server pseudo-root.  It does not need to be a path that is accessible
   via NFS.

   If the fileset is read-only, then this operation SHOULD indicate this
   with a status of FEDFS_ERR_ROFS.

   If the path contains an invalid UTF-8 character, then status



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   FEDFS_ERR_BADCHAR MUST be returned.

   The path used to delete a junction might not be the same path that
   was used to create the junction.  If the namespace on the server has
   changed, then the junction might now appear at a different path than
   where it was created.  If there is more than one valid path to the
   junction, any of them can be used.

   The path is REQUIRED to exist and be completely local to the server.
   It MUST NOT contain a junction, except as the final component, which
   MUST be a junction.  If any other component of the path is a
   junction, then this operation MUST fail with status
   FEDFS_ERR_NOTLOCAL.  If the last component of the path is not a
   junction then this operation MUST return status FEDFS_ERR_NOTJUNCT.
   The path might contain a symbolic link (if supported by the local
   server), but the traversal of the path MUST remain within the server-
   local namespace.

   The server MAY enforce the local permissions on the path, including
   the final component.  If the path cannot be traversed because of
   insufficient permissions, or the parent directory of the junction is
   an unexecutable or unwritable directory, then the operation MAY fail
   with status FEDFS_ERR_ACCESS.

   The removal of the association between the path and the FSN MUST be
   durable before the operation returns successfully.  If the operation
   return codes indicates success, then the junction was successfully
   destroyed.

   The effective permissions and other attributes of the directory that
   is restored by this operation SHOULD be identical to their value
   prior to the creation of the junction.

   After removal of the junction, the fileserver MAY check if any of its
   existing junctions reference the NSDB specified in the removed
   junction's FSN.  If the NSDB is not referenced, the fileserver MAY
   delete the connection parameters of the unreferenced NSDB.

5.3.3.  Errors

      FEDFS_ERR_ACCESS
      FEDFS_ERR_BADCHAR
      FEDFS_ERR_BADNAME
      FEDFS_ERR_NAMETOOLONG
      FEDFS_ERR_LOOP
      FEDFS_ERR_BADXDR





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      FEDFS_ERR_INVAL
      FEDFS_ERR_IO
      FEDFS_ERR_NOTJUNCT
      FEDFS_ERR_NOTLOCAL
      FEDFS_ERR_PERM
      FEDFS_ERR_ROFS
      FEDFS_ERR_SVRFAULT
      FEDFS_ERR_PATH_TYPE_UNSUPP
      FEDFS_ERR_NOTSUPP
      FEDFS_ERR_DELAY

5.4.  FEDFS_LOOKUP_JUNCTION

5.4.1.  Synopsis

   Query the server to discover the current value of the junction (if
   any) at a given path in the server namespace.

5.4.2.  Description

   This operation queries a server to determine whether a given path
   ends in a junction, and if so, the FSN to which the junction refers
   and the filerserver's ability to resolve the junction.

   Ordinary NFSv4 operations do not provide any general mechanism to
   determine whether an object is a junction -- there is no encoding
   specified by the NFSv4 protocol that can represent this information.

   As with FEDFS_CREATE_JUNCTION, the pathname MUST be in the form of an
   array of one or more UTF-8 path component strings.  It is not
   required that this path be accessible in any other manner (e.g., to a
   client).  This path does not appear in the federated namespace,
   except by coincidence; there is no requirement that the global
   namespace reflect the server namespace, nor is it required that this
   path be relative to the server pseudo-root.  It does not need to be a
   path that is accessible via NFS.

   If the path contains an invalid UTF-8 character, then status
   FEDFS_ERR_BADCHAR MUST be returned.

   The path used to lookup a junction might not be the same path that
   was used to create the junction.  If the namespace on the server has
   changed, then a junction might now appear at a different path than
   where it was created.  If there is more than one valid path to the
   junction, any of them might be used.

   The path is REQUIRED to exist and be completely local to the server.
   It MUST NOT contain a junction, except as the final component.  If



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   any other component of the path is a junction, then this operation
   MUST fail with status FEDFS_ERR_NOTLOCAL.  If the last component of
   the path is not a junction then this operation MUST return the status
   FEDFS_ERR_NOTJUNCT.  The path might contain a symbolic link (if
   supported by the local server), but the traversal of the path MUST
   remain within the server-local namespace.

   The server MAY enforce the local permissions on the path, including
   the final component.  If the path cannot be traversed because of
   insufficient permissions, or the parent directory of the junction is
   an unexecutable or unwritable directory, then the operation MAY fail
   with status FEDFS_ERR_ACCESS.

   If the junction exists, the resolve parameter allows for testing the
   fileserver's ability to resolve the junction.  If the junction does
   not exist, the fileserver will ignore the resolve parameter.

   If the junction exists and the resolve parameter is set to
   FEDFS_RESOLVE_NONE, the fileserver MUST NOT attempt to resolve the
   FSN.  This will allow the administrator to obtain the junction's FSN
   even if the resolution would fail.  Therefore on success, the result
   of a FEDFS_RESOLVE_NONE call will return a 0 length fsl list in the
   FedFsLookupResOk structure.

   If the junction exists and the resolve parameter is set to
   FEDFS_RESOLVE_CACHE, the fileserver MUST attempt to resolve the FSN
   using its FSL cache, if one exists.  The fileserver MUST NOT resolve
   the FSN by contacting the appropriate NSDB.  If the fileserver's
   cache does not have a mapping for the FSN in question, the result of
   the operation MUST be FEDFS_OK with 0 elements in the
   FedFsLookupResOk structure's fsl array.  The operation MAY fail with
   status FEDFS_ERR_NO_CACHE if the fileserver does not contain an FSN-
   to-FSL cache or with status FEDFS_ERR_UNKNOWN_CACHE if the state of
   the cache is unknown.

   If the junction exists and the resolve parameter is set to
   FEDFS_RESOLVE_NSDB, the fileserver MUST attempt to resolve the FSN by
   contacting the appropriate NSDB.  The FSN MUST NOT be resolved using
   cached information.  The resolution MAY fail with
   FEDFS_ERR_NSDB_ROUTE, FEDFS_ERR_NSDB_DOWN, FEDFS_ERR_NSDB_CONN,
   FEDFS_ERR_NSDB_AUTH, FEDFS_ERR_NSDB_LDAP, FEDFS_ERR_NSDB_LDAP_VAL,
   FEDFS_ERR_NSDB_NOFSN, FEDFS_ERR_NSDB_NOFSL, FEDFS_ERR_NSDB_NONCE,
   FEDFS_ERR_NSDB_RESPONSE, FEDFS_ERR_NSDB_FAULT,
   FEDFS_ERR_NSDB_LDAP_REFERRAL, FEDFS_ERR_NSDB_LDAP_REFERRAL_VAL,
   FEDFS_ERR_NSDB_LDAP_REFERRAL_NOTFOLLOWED, or
   FEDFS_ERR_NSDB_PARAMS_LDAP_REFERRAL, depending on the nature of the
   failure.




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   In the case of a LDAP failure, the fileserver MAY return either
   FEDFS_ERR_NSDB_LDAP or FEDFS_ERR_NSDB_LDAP_VAL.  FEDFS_ERR_NSDB_LDAP
   indicates that an LDAP protocol error occurred during the resolution.
   FEDFS_ERR_NSDB_LDAP_VAL also indicates that an LDAP protocol error
   occurred during the resolution and allows the LDAP protocol error
   value to be returned in the FedFsLookupRes's ldapResultCode field
   (see the resultCode values in Section 4.1.9 of [RFC4511]).

   If the NSDB responds with an LDAP referral, either the Referral type
   defined in Section 4.1.10 of [RFC4511] or the SearchResultReference
   type defined in Section 4.5.3 of [RFC4511], the fileserver SHOULD
   process the LDAP referral using the same policies as the fileserver's
   file-access protocol server.  The fileserver can indicate a failure
   while processing the LDAP referral using
   FEDFS_ERR_NSDB_LDAP_REFERRAL, FEDFS_ERR_NSDB_LDAP_REFERRAL_VAL,
   FEDFS_ERR_NSDB_LDAP_REFERRAL_NOTFOLLOWED, or
   FEDFS_ERR_NSDB_PARAMS_LDAP_REFERRAL.  The
   FEDFS_ERR_NSDB_LDAP_REFERRAL_VAL is analogous to the
   FEDFS_ERR_NSDB_LDAP_VAL error and allows the LDAP protocol error
   value to be returned in the FedFsLookupResReferralVal's
   ldapResultCode field.  The FEDFS_ERR_NSDB_LDAP_REFERRAL and
   FEDFS_ERR_NSDB_PARAMS_LDAP_REFERRAL errors errors allow the NSDB
   targeted by the LDAP referral to be returned in the FedFsLookupRes's
   targetNsdb field.  Similarly, the FEDFS_ERR_NSDB_LDAP_REFERRAL_VAL
   error includes this information in the FedFsLookupResReferralVal's
   targetNsdb.

   If the fileserver has a cache of FSL records, the process of
   resolving an FSN using an NSDB SHOULD result in the cache being
   updated.  A failure to update the cache can be indicated with the
   FEDFS_ERR_NO_CACHE_UPDATE status value.  When updating the cache, new
   FSLs for the given FSN SHOULD be added to the cache and deleted FSLs
   SHOULD be removed from the cache.  This behavior is desirable because
   it allows an administrator to proactively request that the fileserver
   refresh its FSL cache.  For example, the administrator might like to
   refresh the fileserver's cache when changes are made to an FSN's
   FSLs.

   If the junction is resolved, the fileserver will include a list of
   UUIDs for the FSN's FSLs in the FedFsLookupResOk structure's fsl
   array.

5.4.3.  Errors

      FEDFS_ERR_ACCESS
      FEDFS_ERR_BADCHAR





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      FEDFS_ERR_BADNAME
      FEDFS_ERR_NAMETOOLONG
      FEDFS_ERR_LOOP
      FEDFS_ERR_BADXDR
      FEDFS_ERR_INVAL
      FEDFS_ERR_IO
      FEDFS_ERR_NOTJUNCT
      FEDFS_ERR_NOTLOCAL
      FEDFS_ERR_PERM
      FEDFS_ERR_SVRFAULT
      FEDFS_ERR_NSDB_ROUTE
      FEDFS_ERR_NSDB_DOWN
      FEDFS_ERR_NSDB_CONN
      FEDFS_ERR_NSDB_AUTH
      FEDFS_ERR_NSDB_LDAP
      FEDFS_ERR_NSDB_LDAP_VAL
      FEDFS_ERR_NSDB_NONCE
      FEDFS_ERR_NSDB_NOFSN
      FEDFS_ERR_NSDB_NOFSL
      FEDFS_ERR_NSDB_RESPONSE
      FEDFS_ERR_NSDB_FAULT
      FEDFS_ERR_NSDB_PARAMS
      FEDFS_ERR_NSDB_LDAP_REFERRAL
      FEDFS_ERR_NSDB_LDAP_REFERRAL_VAL
      FEDFS_ERR_NSDB_LDAP_REFERRAL_NOTFOLLOWED
      FEDFS_ERR_NSDB_PARAMS_LDAP_REFERRAL
      FEDFS_ERR_PATH_TYPE_UNSUPP
      FEDFS_ERR_NOTSUPP
      FEDFS_ERR_DELAY
      FEDFS_ERR_NO_CACHE
      FEDFS_ERR_UNKNOWN_CACHE
      FEDFS_ERR_NO_CACHE_UPDATE

5.5.  FEDFS_CREATE_REPLICATION

5.5.1.  Synopsis

   Set an FSN representing the replication information for the fileset
   containing the pathname.

5.5.2.  Description

   This operation indicates the replication information to be returned
   for a particular fileset.  An NFSv4.x client might request
   fs_locations or fs_locations_info at any time to detect other copies
   of this fileset, and this operation supports this by supplying the
   FSN the fileserver should use to respond.  This FSN should be
   associated with the entire fileset in which the path resides, and



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   should be used to satisfy fs_locations or fs_locations_info attribute
   requests whenever no junction is being accessed; if a junction is
   being accessed, the FSN specified by FEDFS_CREATE_JUNCTION will take
   precedence.  Setting the replication FSN on a fileset that already
   has a replication FSN set is allowed.

   This operation differs from FEDFS_CREATE_JUNCTION in that it controls
   a fileset-wide attribute not associated with a junction.

   The server SHOULD permit this operation even on read-only filesets,
   but MAY return FEDFS_ERR_ROFS if this is not possible.

   If the path contains an invalid UTF-8 character, then status
   FEDFS_ERR_BADCHAR MUST be returned.

   The path is REQUIRED to exist and be completely local to the server.
   It MUST NOT contain a junction.  If any component of the path is a
   junction, then this operation MUST fail with status
   FEDFS_ERR_NOTLOCAL.  The path might contain a symbolic link (if
   supported by the local server), but the traversal of the path MUST
   remain within the server-local namespace.

   The server MAY enforce the local permissions on the path, including
   the final component.  If the path cannot be traversed because of
   insufficient permissions, or the final component is an unexecutable
   or unwritable directory, then the operation MAY fail with status
   FEDFS_ERR_ACCESS.

   The operation SHOULD fail with status FEDFS_ERR_NSDB_PARAMS if the
   fileserver does not have any connection parameters on record for the
   specified NSDB.

   The same FSN value SHOULD be associated with all replicas of a
   filesystem.  Depending on the underlying representation, the FSN
   associated with a filesystem might or might not be replicated
   automatically with the filesystem replication mechanism.  Therefore
   if FEDFS_CREATE_REPLICATION is used on one replica of a filesystem,
   it SHOULD be used on all replicas.

5.5.3.  Errors

      FEDFS_ERR_ACCESS
      FEDFS_ERR_BADCHAR
      FEDFS_ERR_BADNAME
      FEDFS_ERR_NAMETOOLONG
      FEDFS_ERR_LOOP





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      FEDFS_ERR_BADXDR
      FEDFS_ERR_EXIST
      FEDFS_ERR_INVAL
      FEDFS_ERR_IO
      FEDFS_ERR_NOSPC
      FEDFS_ERR_NOTLOCAL
      FEDFS_ERR_PERM
      FEDFS_ERR_ROFS
      FEDFS_ERR_SVRFAULT
      FEDFS_ERR_PATH_TYPE_UNSUPP
      FEDFS_ERR_NOTSUPP
      FEDFS_ERR_DELAY

5.6.  FEDFS_DELETE_REPLICATION

5.6.1.  Synopsis

   Remove the replication information for the fileset containing the
   pathname.

5.6.2.  Description

   This operation removes any replication information from the fileset
   in which the path resides, such that NFSv4.x client requests for
   fs_locations or fs_locations_info in the absence of a junction will
   not be satisfied.

   This operation differs from FEDFS_DELETE_JUNCTION in that it controls
   a fileset-wide attribute not associated with a junction.

   The server SHOULD permit this operation even on read-only filesets,
   but MAY return FEDFS_ERR_ROFS if this is not possible.

   If the path contains an invalid UTF-8 character, then status
   FEDFS_ERR_BADCHAR MUST be returned.

   The path is REQUIRED to exist and be completely local to the server.
   It MUST NOT contain a junction.  If any component of the path is a
   junction, then this operation MUST fail with status
   FEDFS_ERR_NOTLOCAL.

   The server MAY enforce the local permissions on the path, including
   the final component.  If the path cannot be traversed because of
   insufficient permissions, or the parent directory of the junction
   unexecutable or unwritable directory, then the operation MAY fail
   with status FEDFS_ERR_ACCESS.





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5.6.3.  Errors

      FEDFS_ERR_ACCESS
      FEDFS_ERR_BADCHAR
      FEDFS_ERR_BADNAME
      FEDFS_ERR_NAMETOOLONG
      FEDFS_ERR_LOOP
      FEDFS_ERR_BADXDR
      FEDFS_ERR_INVAL
      FEDFS_ERR_IO
      FEDFS_ERR_NOTJUNCT
      FEDFS_ERR_NOTLOCAL
      FEDFS_ERR_PERM
      FEDFS_ERR_ROFS
      FEDFS_ERR_SVRFAULT
      FEDFS_ERR_PATH_TYPE_UNSUPP
      FEDFS_ERR_NOTSUPP
      FEDFS_ERR_DELAY

5.7.  FEDFS_LOOKUP_REPLICATION

5.7.1.  Synopsis

   Query the server to discover the current replication information (if
   any) at the given path.

5.7.2.  Description

   This operation queries a server to determine whether a fileset
   containing the given path has replication information associated with
   it, and if so, the FSN for that replication information.

   This operation differs from FEDFS_LOOKUP_JUNCTION in that it inquires
   about a fileset-wide attribute not associated with a junction.

   If the path contains an invalid UTF-8 character, then status
   FEDFS_ERR_BADCHAR MUST be returned.

   The path is REQUIRED to exist and be completely local to the server.
   It MUST NOT contain a junction.  If any component of the path is a
   junction, then this operation MUST fail with status
   FEDFS_ERR_NOTLOCAL.

   The server MAY enforce the local permissions on the path, including
   the final component.  If the path cannot be traversed because of
   insufficient permissions, or the parent directory of the junction is
   an unexecutable or unwritable directory, then the operation MAY fail
   with status FEDFS_ERR_ACCESS.



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   Interpretation of the 'resolve' parameter and the procedure's results
   shall be the same as specified in Section 5.4 for the
   FEDFS_LOOKUP_JUNCTION operation.

5.7.3.  Errors

      FEDFS_ERR_ACCESS
      FEDFS_ERR_BADCHAR
      FEDFS_ERR_BADNAME
      FEDFS_ERR_NAMETOOLONG
      FEDFS_ERR_LOOP
      FEDFS_ERR_BADXDR
      FEDFS_ERR_INVAL
      FEDFS_ERR_IO
      FEDFS_ERR_NOTJUNCT
      FEDFS_ERR_NOTLOCAL
      FEDFS_ERR_PERM
      FEDFS_ERR_SVRFAULT
      FEDFS_ERR_NSDB_ROUTE
      FEDFS_ERR_NSDB_DOWN
      FEDFS_ERR_NSDB_CONN
      FEDFS_ERR_NSDB_AUTH
      FEDFS_ERR_NSDB_LDAP
      FEDFS_ERR_NSDB_LDAP_VAL
      FEDFS_ERR_NSDB_NONCE
      FEDFS_ERR_NSDB_NOFSN
      FEDFS_ERR_NSDB_NOFSL
      FEDFS_ERR_NSDB_RESPONSE
      FEDFS_ERR_NSDB_FAULT
      FEDFS_ERR_NSDB_PARAMS
      FEDFS_ERR_NSDB_LDAP_REFERRAL
      FEDFS_ERR_NSDB_LDAP_REFERRAL_VAL
      FEDFS_ERR_NSDB_LDAP_REFERRAL_NOTFOLLOWED
      FEDFS_ERR_NSDB_PARAMS_LDAP_REFERRAL
      FEDFS_ERR_PATH_TYPE_UNSUPP
      FEDFS_ERR_NOTSUPP
      FEDFS_ERR_DELAY
      FEDFS_ERR_NO_CACHE
      FEDFS_ERR_UNKNOWN_CACHE

5.8.  FEDFS_SET_NSDB_PARAMS

5.8.1.  Synopsis

   Set the connection parameters for the specified NSDB.






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5.8.2.  Description

   This operations allows the administrator to set the connection
   parameters for a given NSDB.

   If a record for the given NSDB does not exist, a new record is
   created with the specified connection parameters.

   If a record for the given NSDB does exist, the existing connection
   parameters are replaced with the specified connection parameters.

   An NSDB is specified using a FedFsNsdbName.  The rules in Section 4.1
   define when two FedFsNsdbNames are considered equal.

   The given NSDB need not be referenced by any junctions on the
   fileserver.  This situation will occur when connection parameters for
   a new NSDB are installed.

   The format of the connection parameters is described above.

   On success, this operation returns FEDFS_OK.  When the operation
   returns, the new connection parameters SHOULD be used for all
   subsequent LDAP connections to the given NSDB.  Existing connections
   MAY be terminated and re-established using the new connection
   parameters.  The connection parameters SHOULD be durable across
   fileserver reboots.

   On failure, an error value indicating the type of error is returned.
   The operation MAY return FEDFS_ERR_ACCESS if the operation's
   associated user does not have sufficient permissions to create/modify
   NSDB connection parameters.

5.8.3.  Errors

      FEDFS_ERR_ACCESS
      FEDFS_ERR_BADCHAR
      FEDFS_ERR_BADNAME
      FEDFS_ERR_BADXDR
      FEDFS_ERR_INVAL
      FEDFS_ERR_IO
      FEDFS_ERR_NOSPC
      FEDFS_ERR_SVRFAULT
      FEDFS_ERR_NOTSUPP
      FEDFS_ERR_DELAY







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5.9.  FEDFS_GET_NSDB_PARAMS

5.9.1.  Synopsis

   Get the connection parameters for the specified NSDB.

5.9.2.  Description

   This operations allows the administrator to retrieve connection
   parameters, if they exist, for the given NSDB.

   An NSDB is specified using a FedFsNsdbName.  The rules in Section 4.1
   define when two FedFsNsdbNames are considered equal.

   A set of connection parameters is considered a match if their
   associated NSDB is equal (as defined above) to the operation's NSDB
   argument.  Therefore, there is at most one set of connection
   parameters that can match the query described by this operation.

   The format of the connection parameters is described above.

   On success, this operation returns FEDFS_OK and the connection
   parameters on record for the given NSDB.

   On failure, an error value indicating the type of error is returned.
   This operation MAY return FEDFS_ERR_NSDB_PARAMS to indicate that
   there are no connection parameters on record for the given NSDB.  The
   operation MAY return FEDFS_ERR_ACCESS if the operation's associated
   user does not have sufficient permissions to view NSDB connection
   parameters.

5.9.3.  Errors

      FEDFS_ERR_ACCESS
      FEDFS_ERR_BADCHAR
      FEDFS_ERR_BADNAME
      FEDFS_ERR_BADXDR
      FEDFS_ERR_INVAL
      FEDFS_ERR_IO
      FEDFS_ERR_SVRFAULT
      FEDFS_ERR_NSDB_PARAMS
      FEDFS_ERR_NOTSUPP
      FEDFS_ERR_DELAY

5.10.  FEDFS_GET_LIMITED_NSDB_PARAMS






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5.10.1.  Synopsis

   Get a limited subset of the connection parameters for the specified
   NSDB.

5.10.2.  Description

   This operation allows the administrator to retrieve a limited subset
   of information on the connection parameters, if they exist, for the
   given NSDB.

   A NSDB is specified using a FedFsNsdbName.  The rules in Section 4.1
   define when two FedFsNsdbNames are considered equal.

   A set of connection parameters is considered a match if their
   associated NSDB is equal (as defined above) to the operation's NSDB
   argument.  Therefore, there is at most one set of connection
   parameters that can match the query described by this operation.

   This operation returns a limited subset of the connection parameters.
   Only the FedFsConnectionSec mechanism that is used to protect
   communication between the fileserver and NSDB is returned.

   Viewing the limited subset of NSDB connection parameters returned by
   FEDFS_GET_LIMITED_NSDB_PARAMS MAY be a less privileged operation than
   viewing the entire set of NSDB connection parameters returned by
   FEDFS_GET_NSDB_PARAMS.  For example, the full contents of an NSDB's
   connection parameters could contain sensitive information for some
   security mechanisms.  FEDFS_GET_LIMITED_NSDB_PARAMS allows the
   fileserver to communicate a subset of the connection parameters (the
   security mechanism) to users with sufficient permissions without
   revealing more sensitive information.

   On success, this operation returns FEDFS_OK and the
   FedFsConnectionSec value on record for the given NSDB.

   On failure, an error value indicating the type of error is returned.
   This operation MAY return FEDFS_ERR_NSDB_PARAMS to indicate that
   there are no connection parameters on record for the given NSDB.  The
   operation MAY return FEDFS_ERR_ACCESS if the operation's associated
   user does not have sufficient permissions to view the subset of NSDB
   connection parameters returned by this procedure.

5.10.3.  Errors

      FEDFS_ERR_ACCESS





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      FEDFS_ERR_BADCHAR
      FEDFS_ERR_BADNAME
      FEDFS_ERR_BADXDR
      FEDFS_ERR_INVAL
      FEDFS_ERR_IO
      FEDFS_ERR_SVRFAULT
      FEDFS_ERR_NSDB_PARAMS
      FEDFS_ERR_NOTSUPP
      FEDFS_ERR_DELAY


6.  Security Considerations

   The ONC RPC protocol supports authentication, integrity and privacy
   via the RPCSEC_GSS framework [RFC2203].  Fileservers which support
   the FedFS administration protocol described above MUST support
   RPCSEC_GSS.  When RPCSEC_GSS is employed, RPCSEC_GSS data integrity
   SHOULD be used.

   It is strongly RECOMMENDED that an Access Control Service be employed
   to restrict access to a fileserver's FedFS administration
   configuration data via the FedFS administrative protocol to prevent
   FedFS namespace corruption, and protect NSDB communication
   parameters.

   For example, when the FedFsNsdbParams secType field value
   FEDFS_SEC_TLS is chosen, the payload is used to provision the trust
   anchor root certificate for TLS secure communication between the
   fileserver and the NSDB.  In this case, RPCSEC_GSS with data
   integrity SHOULD be employed along with an Access Control Service to
   restrict access to domain adminstrators

   FEDFS_GET_LIMITED_NSDB_PARAMS's interaction with the NSDB's
   connection parameters is discussed in Section 5.10.2.


7.  IANA Considerations

   A range of ONC RPC program numbers were assigned for use by FedFS
   using the procedure described in Section 7.3 "Program Number
   Assignment" of [RFC5531].  The FedFS range is:

      IETF NFSv4 Working Group - FedFS 100418 - 100421

   This document describes version 1 of the ONC RPC program 100418 with
   the short name "fedfs_admin", a Description of "FedFS
   Administration", and a reference of [RFCTBD10].  Program 100418 will
   be removed from the reserved FedFS range and assigned these new



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   values.


8.  References

8.1.  Normative References

   [3530bis]  Haynes, T. and D. Noveck, "NFS Version 4 Protocol",
              draft-ietf-nfsv4-rfc3530bis (Work In Progress), 2010.

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC2203]  Eisler, M., Chiu, A., and L. Ling, "RPCSEC_GSS Protocol
              Specification", RFC 2203, September 1997.

   [RFC4122]  Leach, P., Mealling, M., and R. Salz, "A Universally
              Unique IDentifier (UUID) URN Namespace", RFC 4122,
              July 2005.

   [RFC4506]  Eisler, M., "XDR: External Data Representation Standard",
              STD 67, RFC 4506, May 2006.

   [RFC4511]  Sermersheim, J., "Lightweight Directory Access Protocol
              (LDAP): The Protocol", RFC 4511, June 2006.

   [RFC4513]  Harrison, R., "Lightweight Directory Access Protocol
              (LDAP): Authentication Methods and Security Mechanisms",
              RFC 4513, June 2006.

   [RFC5246]  Dierks, T. and E. Rescorla, "The Transport Layer Security
              (TLS) Protocol Version 1.2", RFC 5246, August 2008.

   [RFC5280]  Cooper, D., Santesson, S., Farrell, S., Boeyen, S.,
              Housley, R., and W. Polk, "Internet X.509 Public Key
              Infrastructure Certificate and Certificate Revocation List
              (CRL) Profile", RFC 5280, May 2008.

   [RFC5531]  Thurlow, R., "RPC: Remote Procedure Call Protocol
              Specification Version 2", RFC 5531, May 2009.

8.2.  Informative References

   [FEDFS-NSDB]
              Lentini, J., Everhart, C., Ellard, D., Tewari, R., and M.
              Naik, "NSDB Protocol for Federated Filesystems",
              draft-ietf-nfsv4-federated-fs-protocol (Work In Progress),
              2010.



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   [MS-CIFS]  Microsoft Corporation, "Common Internet File System (CIFS)
              Protocol Specification", MS-CIFS 2.0, November 2009.

   [MS-SMB]   Microsoft Corporation, "Server Message Block (SMB)
              Protocol Specification", MS-SMB 17.0, November 2009.

   [MS-SMB2]  Microsoft Corporation, "Server Message Block (SMB) Version
              2 Protocol Specification", MS-SMB2 19.0, November 2009.

   [RFC1813]  Callaghan, B., Pawlowski, B., and P. Staubach, "NFS
              Version 3 Protocol Specification", RFC 1813, June 1995.

   [RFC5661]  Shepler, S., Eisler, M., and D. Noveck, "Network File
              System (NFS) Version 4 Minor Version 1 Protocol",
              RFC 5661, January 2010.

   [RFC5662]  Shepler, S., Eisler, M., and D. Noveck, "Network File
              System (NFS) Version 4 Minor Version 1 External Data
              Representation Standard (XDR) Description", RFC 5662,
              January 2010.

   [RFC5716]  Lentini, J., Everhart, C., Ellard, D., Tewari, R., and M.
              Naik, "Requirements for Federated File Systems", RFC 5716,
              January 2010.


Appendix A.  Acknowledgments

   We would like to thank Robert Thurlow for helping to author this
   document, including drafting the replication procedure text.

   We would also like to thank Paul Lemahieu and Mario Wurzl for helping
   to author this document.

   We would also like to thank Trond Myklebust for suggesting
   improvements to the FSL pathname format, Chuck Lever for suggesting
   improvements to the XDR type definitions and error codes, David
   Noveck for his suggestions on internationalization and path encoding
   rules, and Nicolas Williams for his suggestions.

   Finally, we would also like to thank Andy Adamson, Rob Thurlow, Tom
   Haynes, and Chuck Lever for the editing effort to get this document
   out the door.

   The extract.sh shell script and formatting conventions were first
   described by the authors of the NFSv4.1 XDR specification [RFC5662].





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Appendix B.  RFC Editor Notes

   [RFC Editor: please remove this section prior to publishing this
   document as an RFC]

   [RFC Editor: prior to publishing this document as an RFC, please
   replace all occurrences of RFCTBD10 with RFCxxxx where xxxx is the
   RFC number of this document]


Authors' Addresses

   James Lentini
   NetApp
   1601 Trapelo Rd, Suite 16
   Waltham, MA  02451
   US

   Phone: +1 781-768-5359
   Email: jlentini@netapp.com


   Craig Everhart
   NetApp
   800 Cranberry Woods Drive
   Cranberry Township, PA  16066
   US

   Phone: +1 724-741-5101
   Email: Craig.Everhart@netapp.com


   Daniel Ellard
   Raytheon BBN Technologies
   10 Moulton Street
   Cambridge, MA  02138
   US

   Phone: +1 617-873-8004
   Email: dellard@bbn.com











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   Renu Tewari
   IBM Almaden
   650 Harry Rd
   San Jose, CA  95120
   US

   Email: tewarir@us.ibm.com


   Manoj Naik
   IBM Almaden
   650 Harry Rd
   San Jose, CA  95120
   US

   Email: manoj@almaden.ibm.com



































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