| /** |
| * 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_connect.h" |
| |
| /** |
| * For now implement truncate here and only for size == 0. |
| * Weak implementation in that we just delete the file and |
| * then re-create it, but don't set the user, group, and times to the old |
| * file's metadata. |
| */ |
| int dfs_truncate(const char *path, off_t size) |
| { |
| struct hdfsConn *conn = NULL; |
| hdfsFS fs; |
| dfs_context *dfs = (dfs_context*)fuse_get_context()->private_data; |
| |
| TRACE1("truncate", path) |
| |
| assert(path); |
| assert('/' == *path); |
| assert(dfs); |
| |
| if (size != 0) { |
| return 0; |
| } |
| |
| int ret = dfs_unlink(path); |
| if (ret != 0) { |
| return ret; |
| } |
| |
| 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); |
| |
| int flags = O_WRONLY | O_CREAT; |
| |
| hdfsFile file; |
| if ((file = (hdfsFile)hdfsOpenFile(fs, path, flags, 0, 0, 0)) == NULL) { |
| ERROR("Could not connect open file %s", path); |
| ret = -EIO; |
| goto cleanup; |
| } |
| |
| if (hdfsCloseFile(fs, file) != 0) { |
| ERROR("Could not close file %s", path); |
| ret = -EIO; |
| goto cleanup; |
| } |
| |
| cleanup: |
| if (conn) { |
| hdfsConnRelease(conn); |
| } |
| return ret; |
| } |