Examples of org.apache.hadoop.nfs.nfs3.response.READDIRPLUS3Response.DirListPlus3

Package org.apache.hadoop.nfs.nfs3.response.READDIRPLUS3Response

Examples of org.apache.hadoop.nfs.nfs3.response.READDIRPLUS3Response.DirListPlus3

org.apache.hadoop.nfs.nfs3.response.READDIR3Response

  }


  @Override
  public FSINFO3Response fsinfo(XDR xdr, SecurityHandler securityHandler,
      InetAddress client) {
    FSINFO3Response response = new FSINFO3Response(Nfs3Status.NFS3_OK);
    
    if (!checkAccessPrivilege(client, AccessPrivilege.READ_ONLY)) {
      response.setStatus(Nfs3Status.NFS3ERR_ACCES);
      return response;
    }
    
    DFSClient dfsClient = clientCache.getDfsClient(securityHandler.getUser());
    if (dfsClient == null) {
      response.setStatus(Nfs3Status.NFS3ERR_SERVERFAULT);
      return response;
    }
    
    FSINFO3Request request = null;
    try {
      request = new FSINFO3Request(xdr);
    } catch (IOException e) {
      LOG.error("Invalid FSINFO request");
      return new FSINFO3Response(Nfs3Status.NFS3ERR_INVAL);
    }


    FileHandle handle = request.getHandle();
    if (LOG.isDebugEnabled()) {
      LOG.debug("NFS FSINFO fileId: " + handle.getFileId());
    }


    try {
      int rtmax = config.getInt(Nfs3Constant.MAX_READ_TRANSFER_SIZE_KEY,
              Nfs3Constant.MAX_READ_TRANSFER_SIZE_DEFAULT);
      int wtmax = config.getInt(Nfs3Constant.MAX_WRITE_TRANSFER_SIZE_KEY,
              Nfs3Constant.MAX_WRITE_TRANSFER_SIZE_DEFAULT);
      int dtperf = config.getInt(Nfs3Constant.MAX_READDIR_TRANSFER_SIZE_KEY,
              Nfs3Constant.MAX_READDIR_TRANSFER_SIZE_DEFAULT);


      Nfs3FileAttributes attrs = Nfs3Utils.getFileAttr(dfsClient,
          Nfs3Utils.getFileIdPath(handle), iug);
      if (attrs == null) {
        LOG.info("Can't get path for fileId:" + handle.getFileId());
        return new FSINFO3Response(Nfs3Status.NFS3ERR_STALE);
      }
      
      int fsProperty = Nfs3Constant.FSF3_CANSETTIME
          | Nfs3Constant.FSF3_HOMOGENEOUS;


      return new FSINFO3Response(Nfs3Status.NFS3_OK, attrs, rtmax, rtmax, 1,
          wtmax, wtmax, 1, dtperf, Long.MAX_VALUE, new NfsTime(1), fsProperty);
    } catch (IOException e) {
      LOG.warn("Exception ", e);
      return new FSINFO3Response(Nfs3Status.NFS3ERR_IO);
    }
  }

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  }
  
  @Override
  public FSSTAT3Response fsstat(XDR xdr, SecurityHandler securityHandler,
      InetAddress client) {
    FSSTAT3Response response = new FSSTAT3Response(Nfs3Status.NFS3_OK);
    
    if (!checkAccessPrivilege(client, AccessPrivilege.READ_ONLY)) {
      response.setStatus(Nfs3Status.NFS3ERR_ACCES);
      return response;
    }
    
    DFSClient dfsClient = clientCache.getDfsClient(securityHandler.getUser());
    if (dfsClient == null) {
      response.setStatus(Nfs3Status.NFS3ERR_SERVERFAULT);
      return response;
    }
    
    FSSTAT3Request request = null;
    try {
      request = new FSSTAT3Request(xdr);
    } catch (IOException e) {
      LOG.error("Invalid FSSTAT request");
      return new FSSTAT3Response(Nfs3Status.NFS3ERR_INVAL);
    }


    FileHandle handle = request.getHandle();
    if (LOG.isDebugEnabled()) {
      LOG.debug("NFS FSSTAT fileId: " + handle.getFileId());
    }


    try {
      // Use superUserClient to get file system status
      FsStatus fsStatus = superUserClient.getDiskStatus();
      long totalBytes = fsStatus.getCapacity();
      long freeBytes = fsStatus.getRemaining();
      
      Nfs3FileAttributes attrs = writeManager.getFileAttr(dfsClient, handle,
          iug);
      if (attrs == null) {
        LOG.info("Can't get path for fileId:" + handle.getFileId());
        return new FSSTAT3Response(Nfs3Status.NFS3ERR_STALE);
      }
      
      long maxFsObjects = config.getLong("dfs.max.objects", 0);
      if (maxFsObjects == 0) {
        // A value of zero in HDFS indicates no limit to the number
        // of objects that dfs supports. Using Integer.MAX_VALUE instead of
        // Long.MAX_VALUE so 32bit client won't complain.
        maxFsObjects = Integer.MAX_VALUE;
      }
      
      return new FSSTAT3Response(Nfs3Status.NFS3_OK, attrs, totalBytes,
          freeBytes, freeBytes, maxFsObjects, maxFsObjects, maxFsObjects, 0);
    } catch (RemoteException r) {
      LOG.warn("Exception ", r);
      IOException io = r.unwrapRemoteException();
      /**
       * AuthorizationException can be thrown if the user can't be proxy'ed.
       */
      if (io instanceof AuthorizationException) {
        return new FSSTAT3Response(Nfs3Status.NFS3ERR_ACCES);
      } else {
        return new FSSTAT3Response(Nfs3Status.NFS3ERR_IO);
      }
    } catch (IOException e) {
      LOG.warn("Exception ", e);
      return new FSSTAT3Response(Nfs3Status.NFS3ERR_IO);
    }
  }

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  }


  @Override
  public GETATTR3Response getattr(XDR xdr, SecurityHandler securityHandler,
      InetAddress client) {
    GETATTR3Response response = new GETATTR3Response(Nfs3Status.NFS3_OK);
    
    if (!checkAccessPrivilege(client, AccessPrivilege.READ_ONLY)) {
      response.setStatus(Nfs3Status.NFS3ERR_ACCES);
      return response;
    }
    
    DFSClient dfsClient = clientCache.getDfsClient(securityHandler.getUser());
    if (dfsClient == null) {
      response.setStatus(Nfs3Status.NFS3ERR_SERVERFAULT);
      return response;
    }
    
    GETATTR3Request request = null;
    try {
      request = new GETATTR3Request(xdr);
    } catch (IOException e) {
      LOG.error("Invalid GETATTR request");
      response.setStatus(Nfs3Status.NFS3ERR_INVAL);
      return response;
    }


    FileHandle handle = request.getHandle();
    if (LOG.isTraceEnabled()) {
      LOG.trace("GETATTR for fileId: " + handle.getFileId());
    }


    Nfs3FileAttributes attrs = null;
    try {
      attrs = writeManager.getFileAttr(dfsClient, handle, iug);
    } catch (RemoteException r) {
      LOG.warn("Exception ", r);
      IOException io = r.unwrapRemoteException();
      /**
       * AuthorizationException can be thrown if the user can't be proxy'ed.
       */
      if (io instanceof AuthorizationException) {
        return new GETATTR3Response(Nfs3Status.NFS3ERR_ACCES);
      } else {
        return new GETATTR3Response(Nfs3Status.NFS3ERR_IO);
      }
    } catch (IOException e) {
      LOG.info("Can't get file attribute, fileId=" + handle.getFileId(), e);
      response.setStatus(Nfs3Status.NFS3ERR_IO);
      return response;
    }
    if (attrs == null) {
      LOG.error("Can't get path for fileId:" + handle.getFileId());
      response.setStatus(Nfs3Status.NFS3ERR_STALE);
      return response;
    }
    response.setPostOpAttr(attrs);
    return response;
  }

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  }


  @Override
  public LOOKUP3Response lookup(XDR xdr, SecurityHandler securityHandler,
      InetAddress client) {
    LOOKUP3Response response = new LOOKUP3Response(Nfs3Status.NFS3_OK);
    
    if (!checkAccessPrivilege(client, AccessPrivilege.READ_ONLY)) {
      response.setStatus(Nfs3Status.NFS3ERR_ACCES);
      return response;
    }
    
    DFSClient dfsClient = clientCache.getDfsClient(securityHandler.getUser());
    if (dfsClient == null) {
      response.setStatus(Nfs3Status.NFS3ERR_SERVERFAULT);
      return response;
    }
    
    LOOKUP3Request request = null;
    try {
      request = new LOOKUP3Request(xdr);
    } catch (IOException e) {
      LOG.error("Invalid LOOKUP request");
      return new LOOKUP3Response(Nfs3Status.NFS3ERR_INVAL);
    }


    FileHandle dirHandle = request.getHandle();
    String fileName = request.getName();
    if (LOG.isDebugEnabled()) {
      LOG.debug("NFS LOOKUP dir fileId: " + dirHandle.getFileId() + " name: "
          + fileName);
    }


    try {
      String dirFileIdPath = Nfs3Utils.getFileIdPath(dirHandle);
      Nfs3FileAttributes postOpObjAttr = writeManager.getFileAttr(dfsClient,
          dirHandle, fileName);
      if (postOpObjAttr == null) {
        if (LOG.isDebugEnabled()) {
          LOG.debug("NFS LOOKUP fileId: " + dirHandle.getFileId() + " name:"
              + fileName + " does not exist");
        }
        Nfs3FileAttributes postOpDirAttr = Nfs3Utils.getFileAttr(dfsClient,
            dirFileIdPath, iug);
        return new LOOKUP3Response(Nfs3Status.NFS3ERR_NOENT, null, null,
            postOpDirAttr);
      }


      Nfs3FileAttributes postOpDirAttr = Nfs3Utils.getFileAttr(dfsClient,
          dirFileIdPath, iug);
      if (postOpDirAttr == null) {
        LOG.info("Can't get path for dir fileId:" + dirHandle.getFileId());
        return new LOOKUP3Response(Nfs3Status.NFS3ERR_STALE);
      }
      FileHandle fileHandle = new FileHandle(postOpObjAttr.getFileId());
      return new LOOKUP3Response(Nfs3Status.NFS3_OK, fileHandle, postOpObjAttr,
          postOpDirAttr);


    } catch (IOException e) {
      LOG.warn("Exception ", e);
      return new LOOKUP3Response(Nfs3Status.NFS3ERR_IO);
    }
  }

View Full Code Here

  }


  @Override
  public MKDIR3Response mkdir(XDR xdr, SecurityHandler securityHandler,
      InetAddress client) {
    MKDIR3Response response = new MKDIR3Response(Nfs3Status.NFS3_OK);
    DFSClient dfsClient = clientCache.getDfsClient(securityHandler.getUser());
    if (dfsClient == null) {
      response.setStatus(Nfs3Status.NFS3ERR_SERVERFAULT);
      return response;
    }
    
    MKDIR3Request request = null;


    try {
      request = new MKDIR3Request(xdr);
    } catch (IOException e) {
      LOG.error("Invalid MKDIR request");
      return new MKDIR3Response(Nfs3Status.NFS3ERR_INVAL);
    }
    FileHandle dirHandle = request.getHandle();
    String fileName = request.getName();


    if (request.getObjAttr().getUpdateFields().contains(SetAttrField.SIZE)) {
      LOG.error("Setting file size is not supported when mkdir: " + fileName
          + " in dirHandle" + dirHandle);
      return new MKDIR3Response(Nfs3Status.NFS3ERR_INVAL);
    }


    String dirFileIdPath = Nfs3Utils.getFileIdPath(dirHandle);
    Nfs3FileAttributes preOpDirAttr = null;
    Nfs3FileAttributes postOpDirAttr = null;
    Nfs3FileAttributes postOpObjAttr = null;
    FileHandle objFileHandle = null;
    try {
      preOpDirAttr = Nfs3Utils.getFileAttr(dfsClient, dirFileIdPath, iug);
      if (preOpDirAttr == null) {
        LOG.info("Can't get path for dir fileId:" + dirHandle.getFileId());
        return new MKDIR3Response(Nfs3Status.NFS3ERR_STALE);
      }


      if (!checkAccessPrivilege(client, AccessPrivilege.READ_WRITE)) {
        return new MKDIR3Response(Nfs3Status.NFS3ERR_ACCES, null, preOpDirAttr,
            new WccData(Nfs3Utils.getWccAttr(preOpDirAttr), preOpDirAttr));
      }
      
      final String fileIdPath = dirFileIdPath + "/" + fileName;
      SetAttr3 setAttr3 = request.getObjAttr();
      FsPermission permission = setAttr3.getUpdateFields().contains(
          SetAttrField.MODE) ? new FsPermission((short) setAttr3.getMode())
          : FsPermission.getDefault().applyUMask(umask);


      if (!dfsClient.mkdirs(fileIdPath, permission, false)) {
        WccData dirWcc = Nfs3Utils.createWccData(
            Nfs3Utils.getWccAttr(preOpDirAttr), dfsClient, dirFileIdPath, iug);
        return new MKDIR3Response(Nfs3Status.NFS3ERR_IO, null, null, dirWcc);
      }


      // Set group if it's not specified in the request.
      if (!setAttr3.getUpdateFields().contains(SetAttrField.GID)) {
        setAttr3.getUpdateFields().add(SetAttrField.GID);
        setAttr3.setGid(securityHandler.getGid());
      }
      setattrInternal(dfsClient, fileIdPath, setAttr3, false);
      
      postOpObjAttr = Nfs3Utils.getFileAttr(dfsClient, fileIdPath, iug);
      objFileHandle = new FileHandle(postOpObjAttr.getFileId());
      WccData dirWcc = Nfs3Utils.createWccData(
          Nfs3Utils.getWccAttr(preOpDirAttr), dfsClient, dirFileIdPath, iug);
      return new MKDIR3Response(Nfs3Status.NFS3_OK, new FileHandle(
          postOpObjAttr.getFileId()), postOpObjAttr, dirWcc);
    } catch (IOException e) {
      LOG.warn("Exception ", e);
      // Try to return correct WccData
      if (postOpDirAttr == null) {
        try {
          postOpDirAttr = Nfs3Utils.getFileAttr(dfsClient, dirFileIdPath, iug);
        } catch (IOException e1) {
          LOG.info("Can't get postOpDirAttr for " + dirFileIdPath, e);
        }
      }
      WccData dirWcc = new WccData(Nfs3Utils.getWccAttr(preOpDirAttr),
          postOpDirAttr);
      if (e instanceof AccessControlException) {
        return new MKDIR3Response(Nfs3Status.NFS3ERR_PERM, objFileHandle,
            postOpObjAttr, dirWcc);
      } else {
        return new MKDIR3Response(Nfs3Status.NFS3ERR_IO, objFileHandle,
            postOpObjAttr, dirWcc);
      }
    }
  }

View Full Code Here

  @Override
  public NFS3Response nullProcedure() {
    if (LOG.isDebugEnabled()) {
      LOG.debug("NFS NULL");
    }
    return new NFS3Response(Nfs3Status.NFS3_OK);
  }

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    }
    
    SecurityHandler securityHandler = getSecurityHandler(credentials,
        rpcCall.getVerifier());
    
    NFS3Response response = null;
    if (nfsproc3 == NFSPROC3.NULL) {
      response = nullProcedure();
    } else if (nfsproc3 == NFSPROC3.GETATTR) {
      response = getattr(xdr, securityHandler, client);
    } else if (nfsproc3 == NFSPROC3.SETATTR) {
      response = setattr(xdr, securityHandler, client);
    } else if (nfsproc3 == NFSPROC3.LOOKUP) {
      response = lookup(xdr, securityHandler, client);
    } else if (nfsproc3 == NFSPROC3.ACCESS) {
      response = access(xdr, securityHandler, client);
    } else if (nfsproc3 == NFSPROC3.READLINK) {
      response = readlink(xdr, securityHandler, client);
    } else if (nfsproc3 == NFSPROC3.READ) {
      if (LOG.isDebugEnabled()) {
          LOG.debug(Nfs3Utils.READ_RPC_START + xid);
      }    
      response = read(xdr, securityHandler, client);
      if (LOG.isDebugEnabled() && (nfsproc3 == NFSPROC3.READ)) {
        LOG.debug(Nfs3Utils.READ_RPC_END + xid);
      }
    } else if (nfsproc3 == NFSPROC3.WRITE) {
      if (LOG.isDebugEnabled()) {
          LOG.debug(Nfs3Utils.WRITE_RPC_START + xid);
      }
      response = write(xdr, channel, xid, securityHandler, client);
      // Write end debug trace is in Nfs3Utils.writeChannel
    } else if (nfsproc3 == NFSPROC3.CREATE) {
      response = create(xdr, securityHandler, client);
    } else if (nfsproc3 == NFSPROC3.MKDIR) {      
      response = mkdir(xdr, securityHandler, client);
    } else if (nfsproc3 == NFSPROC3.SYMLINK) {
      response = symlink(xdr, securityHandler, client);
    } else if (nfsproc3 == NFSPROC3.MKNOD) {
      response = mknod(xdr, securityHandler, client);
    } else if (nfsproc3 == NFSPROC3.REMOVE) {
      response = remove(xdr, securityHandler, client);
    } else if (nfsproc3 == NFSPROC3.RMDIR) {
      response = rmdir(xdr, securityHandler, client);
    } else if (nfsproc3 == NFSPROC3.RENAME) {
      response = rename(xdr, securityHandler, client);
    } else if (nfsproc3 == NFSPROC3.LINK) {
      response = link(xdr, securityHandler, client);
    } else if (nfsproc3 == NFSPROC3.READDIR) {
      response = readdir(xdr, securityHandler, client);
    } else if (nfsproc3 == NFSPROC3.READDIRPLUS) {
      response = readdirplus(xdr, securityHandler, client);
    } else if (nfsproc3 == NFSPROC3.FSSTAT) {
      response = fsstat(xdr, securityHandler, client);
    } else if (nfsproc3 == NFSPROC3.FSINFO) {
      response = fsinfo(xdr, securityHandler, client);
    } else if (nfsproc3 == NFSPROC3.PATHCONF) {
      response = pathconf(xdr, securityHandler, client);
    } else if (nfsproc3 == NFSPROC3.COMMIT) {
      response = commit(xdr, channel, xid, securityHandler, client);
    } else {
      // Invalid procedure
      RpcAcceptedReply.getInstance(xid,
          RpcAcceptedReply.AcceptState.PROC_UNAVAIL, new VerifierNone()).write(
          out);
    }
    if (response == null) {
      if (LOG.isDebugEnabled()) {
        LOG.debug("No sync response, expect an async response for request XID="
            + rpcCall.getXid());
      }
      return;
    }
    // TODO: currently we just return VerifierNone
    out = response.writeHeaderAndResponse(out, xid, new VerifierNone());
    ChannelBuffer buf = ChannelBuffers.wrappedBuffer(out.asReadOnlyWrap()
        .buffer());
    RpcResponse rsp = new RpcResponse(buf, info.remoteAddress());


    if (!isIdempotent(rpcCall)) {

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  }


  @Override
  public PATHCONF3Response pathconf(XDR xdr, SecurityHandler securityHandler,
      InetAddress client) {
    PATHCONF3Response response = new PATHCONF3Response(Nfs3Status.NFS3_OK);
    
    if (!checkAccessPrivilege(client, AccessPrivilege.READ_ONLY)) {
      response.setStatus(Nfs3Status.NFS3ERR_ACCES);
      return response;
    }
    
    DFSClient dfsClient = clientCache.getDfsClient(securityHandler.getUser());
    if (dfsClient == null) {
      response.setStatus(Nfs3Status.NFS3ERR_SERVERFAULT);
      return response;
    }
    
    PATHCONF3Request request = null;
    try {
      request = new PATHCONF3Request(xdr);
    } catch (IOException e) {
      LOG.error("Invalid PATHCONF request");
      return new PATHCONF3Response(Nfs3Status.NFS3ERR_INVAL);
    }


    FileHandle handle = request.getHandle();
    Nfs3FileAttributes attrs;


    if (LOG.isDebugEnabled()) {
      LOG.debug("NFS PATHCONF fileId: " + handle.getFileId());
    }


    try {
      attrs = Nfs3Utils.getFileAttr(dfsClient, Nfs3Utils.getFileIdPath(handle),
          iug);
      if (attrs == null) {
        LOG.info("Can't get path for fileId:" + handle.getFileId());
        return new PATHCONF3Response(Nfs3Status.NFS3ERR_STALE);
      }


      return new PATHCONF3Response(Nfs3Status.NFS3_OK, attrs, 0,
          HdfsConstants.MAX_PATH_LENGTH, true, false, false, true);
    } catch (IOException e) {
      LOG.warn("Exception ", e);
      return new PATHCONF3Response(Nfs3Status.NFS3ERR_IO);
    }
  }

View Full Code Here

  }


  @Override
  public READ3Response read(XDR xdr, SecurityHandler securityHandler,
      InetAddress client) {
    READ3Response response = new READ3Response(Nfs3Status.NFS3_OK);
    final String userName = securityHandler.getUser();
    
    if (!checkAccessPrivilege(client, AccessPrivilege.READ_ONLY)) {
      response.setStatus(Nfs3Status.NFS3ERR_ACCES);
      return response;
    }
    
    DFSClient dfsClient = clientCache.getDfsClient(userName);
    if (dfsClient == null) {
      response.setStatus(Nfs3Status.NFS3ERR_SERVERFAULT);
      return response;
    }
    
    READ3Request request = null;


    try {
      request = new READ3Request(xdr);
    } catch (IOException e) {
      LOG.error("Invalid READ request");
      return new READ3Response(Nfs3Status.NFS3ERR_INVAL);
    }


    long offset = request.getOffset();
    int count = request.getCount();


    FileHandle handle = request.getHandle();
    if (LOG.isDebugEnabled()) {
      LOG.debug("NFS READ fileId: " + handle.getFileId() + " offset: " + offset
          + " count: " + count);
    }


    Nfs3FileAttributes attrs;
    boolean eof;
    if (count == 0) {
      // Only do access check.
      try {
        // Don't read from cache. Client may not have read permission.
        attrs = Nfs3Utils.getFileAttr(dfsClient,
            Nfs3Utils.getFileIdPath(handle), iug);
      } catch (IOException e) {
        if (LOG.isDebugEnabled()) {
          LOG.debug("Get error accessing file, fileId:" + handle.getFileId(), e);
        }
        return new READ3Response(Nfs3Status.NFS3ERR_IO);
      }
      if (attrs == null) {
        if (LOG.isDebugEnabled()) {
          LOG.debug("Can't get path for fileId:" + handle.getFileId());
        }
        return new READ3Response(Nfs3Status.NFS3ERR_NOENT);
      }
      int access = Nfs3Utils.getAccessRightsForUserGroup(
          securityHandler.getUid(), securityHandler.getGid(), attrs);
      if ((access & Nfs3Constant.ACCESS3_READ) != 0) {
        eof = offset < attrs.getSize() ? false : true;
        return new READ3Response(Nfs3Status.NFS3_OK, attrs, 0, eof,
            ByteBuffer.wrap(new byte[0]));
      } else {
        return new READ3Response(Nfs3Status.NFS3ERR_ACCES);
      }
    }
    
    // In case there is buffered data for the same file, flush it. This can be
    // optimized later by reading from the cache.
    int ret = writeManager.commitBeforeRead(dfsClient, handle, offset + count);
    if (ret != Nfs3Status.NFS3_OK) {
      LOG.warn("commitBeforeRead didn't succeed with ret=" + ret
          + ". Read may not get most recent data.");
    }


    try {
      int rtmax = config.getInt(Nfs3Constant.MAX_READ_TRANSFER_SIZE_KEY,
              Nfs3Constant.MAX_READ_TRANSFER_SIZE_DEFAULT);
      int buffSize = Math.min(rtmax, count);
      byte[] readbuffer = new byte[buffSize];


      int readCount = 0;
      /**
       * Retry exactly once because the DFSInputStream can be stale.
       */
      for (int i = 0; i < 1; ++i) {
        FSDataInputStream fis = clientCache.getDfsInputStream(userName,
            Nfs3Utils.getFileIdPath(handle));


        try {
          readCount = fis.read(offset, readbuffer, 0, count);
        } catch (IOException e) {
          // TODO: A cleaner way is to throw a new type of exception
          // which requires incompatible changes.
          if (e.getMessage() == "Stream closed") {
            clientCache.invalidateDfsInputStream(userName,
                Nfs3Utils.getFileIdPath(handle));
            continue;
          } else {
            throw e;
          }
        }
      }


      attrs = Nfs3Utils.getFileAttr(dfsClient, Nfs3Utils.getFileIdPath(handle),
          iug);
      if (readCount < count) {
        LOG.info("Partical read. Asked offset:" + offset + " count:" + count
            + " and read back:" + readCount + "file size:" + attrs.getSize());
      }
      // HDFS returns -1 for read beyond file size.
      if (readCount < 0) {
        readCount = 0;
      }
      eof = (offset + readCount) < attrs.getSize() ? false : true;
      return new READ3Response(Nfs3Status.NFS3_OK, attrs, readCount, eof,
          ByteBuffer.wrap(readbuffer));


    } catch (IOException e) {
      LOG.warn("Read error: " + e.getClass() + " offset: " + offset
          + " count: " + count, e);
      return new READ3Response(Nfs3Status.NFS3ERR_IO);
    }
  }

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    }
  }


  public READDIR3Response mknod(XDR xdr,
      SecurityHandler securityHandler, InetAddress client) {
    return new READDIR3Response(Nfs3Status.NFS3ERR_NOTSUPP);
  }

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org.apache.hadoop.conf.Configuration

org.apache.hadoop.hdfs.nfs.mount.RpcProgramMountd

org.apache.hadoop.hdfs.nfs.nfs3.Nfs3Utils

org.apache.hadoop.hdfs.nfs.nfs3.OpenFileCtx

org.apache.hadoop.hdfs.nfs.nfs3.OpenFileCtxCache

org.apache.hadoop.hdfs.nfs.nfs3.RpcProgramNfs3

org.apache.hadoop.hdfs.nfs.nfs3.TestClientAccessPrivilege

org.apache.hadoop.hdfs.nfs.nfs3.TestNfs3Utils

org.apache.hadoop.hdfs.nfs.nfs3.TestOpenFileCtxCache

org.apache.hadoop.hdfs.nfs.nfs3.TestReaddir

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