fuse_impls_write.c
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上传日期:2018-01-08
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文件大小:2k
- /**
- * 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_file_handle.h"
- int dfs_write(const char *path, const char *buf, size_t size,
- off_t offset, struct fuse_file_info *fi)
- {
- TRACE1("write", path)
- // retrieve dfs specific data
- dfs_context *dfs = (dfs_context*)fuse_get_context()->private_data;
- int ret = 0;
- // check params and the context var
- assert(path);
- assert(dfs);
- assert('/' == *path);
- assert(fi);
- dfs_fh *fh = (dfs_fh*)fi->fh;
- assert(fh);
- hdfsFile file_handle = (hdfsFile)fh->hdfsFH;
- assert(file_handle);
- //
- // Critical section - make the sanity check (tell to see the writes are sequential) and the actual write
- // (no returns until end)
- //
- pthread_mutex_lock(&fh->mutex);
- tSize length = 0;
- assert(fh->fs);
- tOffset cur_offset = hdfsTell(fh->fs, file_handle);
- if (cur_offset != offset) {
- syslog(LOG_ERR, "ERROR: user trying to random access write to a file %d!=%d for %s %s:%dn",(int)cur_offset, (int)offset,path, __FILE__, __LINE__);
- ret = -EIO;
- } else {
- length = hdfsWrite(fh->fs, file_handle, buf, size);
- if (length <= 0) {
- syslog(LOG_ERR, "ERROR: fuse problem - could not write all the bytes for %s %d!=%d%s:%dn",path,length,(int)size, __FILE__, __LINE__);
- ret = -EIO;
- }
- if (length != size) {
- syslog(LOG_ERR, "WARN: fuse problem - could not write all the bytes for %s %d!=%d%s:%dn",path,length,(int)size, __FILE__, __LINE__);
- }
- }
- //
- // Critical section end
- //
- pthread_mutex_unlock(&fh->mutex);
- return ret == 0 ? length : ret;
- }