hadoop/hadoop-hdfs-project/hadoop-hdfs/src/main/native/fuse-dfs/fuse_impls_rename.c

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "fuse_dfs.h"
#include "fuse_impls.h"
#include "fuse_trash.h"
#include "fuse_connect.h"

int dfs_rename(const char *from, const char *to)
{
  struct hdfsConn *conn = NULL;
  hdfsFS fs;
  dfs_context *dfs = (dfs_context*)fuse_get_context()->private_data;
  int ret;

  TRACE1("rename", from) 

  // check params and the context var
  assert(from);
  assert(to);
  assert(dfs);

  assert('/' == *from);
  assert('/' == *to);

  if (is_protected(from) || is_protected(to)) {
    ERROR("Could not rename %s to %s", from, to);
    return -EACCES;
  }

  if (dfs->read_only) {
    ERROR("HDFS configured read-only, cannot rename directory %s", from);
    return -EACCES;
  }

  ret = fuseConnectAsThreadUid(&conn);
  if (ret) {
    fprintf(stderr, "fuseConnectAsThreadUid: failed to open a libhdfs "
            "connection!  error %d.\n", ret);
    ret = -EIO;
    goto cleanup;
  }
  fs = hdfsConnGetFs(conn);
  if (hdfsRename(fs, from, to)) {
    ERROR("Rename %s to %s failed", from, to);
    ret = (errno > 0) ? -errno : -EIO;
    goto cleanup;
  }
  ret = 0;

cleanup:
  if (conn) {
    hdfsConnRelease(conn);
  }
  return ret;
}