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- /**
- * 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;
- }
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