| /** |
| * 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" |
| #include "fuse_file_handle.h" |
| |
| int dfs_open(const char *path, struct fuse_file_info *fi) |
| { |
| TRACE1("open", path) |
| |
| dfs_context *dfs = (dfs_context*)fuse_get_context()->private_data; |
| |
| // check params and the context var |
| assert(path); |
| assert('/' == *path); |
| assert(dfs); |
| |
| int ret = 0; |
| |
| // 0x8000 is always passed in and hadoop doesn't like it, so killing it here |
| // bugbug figure out what this flag is and report problem to Hadoop JIRA |
| int flags = (fi->flags & 0x7FFF); |
| |
| // retrieve dfs specific data |
| dfs_fh *fh = (dfs_fh*)malloc(sizeof (dfs_fh)); |
| if (fh == NULL) { |
| syslog(LOG_ERR, "ERROR: malloc of new file handle failed %s:%d\n", __FILE__, __LINE__); |
| return -EIO; |
| } |
| |
| if ((fh->fs = doConnectAsUser(dfs->nn_hostname,dfs->nn_port)) == NULL) { |
| syslog(LOG_ERR, "ERROR: could not connect to dfs %s:%d\n", __FILE__, __LINE__); |
| return -EIO; |
| } |
| |
| if (flags & O_RDWR) { |
| hdfsFileInfo *info = hdfsGetPathInfo(dfs->fs,path); |
| if (info == NULL) { |
| // File does not exist (maybe?); interpret it as a O_WRONLY |
| // If the actual error was something else, we'll get it again when |
| // we try to open the file. |
| flags ^= O_RDWR; |
| flags |= O_WRONLY; |
| } else { |
| // File exists; open this as read only. |
| flags ^= O_RDWR; |
| flags |= O_RDONLY; |
| } |
| } |
| |
| if ((fh->hdfsFH = hdfsOpenFile(fh->fs, path, flags, 0, 0, 0)) == NULL) { |
| syslog(LOG_ERR, "ERROR: could not connect open file %s:%d\n", __FILE__, __LINE__); |
| syslog(LOG_ERR, "ERROR: errno %d\n", errno); |
| if (errno == 0 || errno == EINTERNAL) { |
| return -EIO; |
| } |
| return -errno; |
| } |
| |
| // |
| // mutex needed for reads/writes |
| // |
| pthread_mutex_init(&fh->mutex, NULL); |
| |
| if (fi->flags & O_WRONLY || fi->flags & O_CREAT) { |
| // write specific initialization |
| fh->buf = NULL; |
| } else { |
| // read specific initialization |
| |
| assert(dfs->rdbuffer_size > 0); |
| |
| if (NULL == (fh->buf = (char*)malloc(dfs->rdbuffer_size*sizeof (char)))) { |
| syslog(LOG_ERR, "ERROR: could not allocate memory for file buffer for a read for file %s dfs %s:%d\n", path,__FILE__, __LINE__); |
| ret = -EIO; |
| } |
| |
| fh->buffersStartOffset = 0; |
| fh->bufferSize = 0; |
| } |
| |
| fi->fh = (uint64_t)fh; |
| |
| return ret; |
| } |