| /** |
| * 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_connect.h" |
| #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; |
| hdfsFS fs = hdfsConnGetFs(fh->conn); |
| |
| tOffset cur_offset = hdfsTell(fs, file_handle); |
| if (cur_offset != offset) { |
| ERROR("User trying to random access write to a file %d != %d for %s", |
| (int)cur_offset, (int)offset, path); |
| ret = -ENOTSUP; |
| } else { |
| length = hdfsWrite(fs, file_handle, buf, size); |
| if (length <= 0) { |
| ERROR("Could not write all bytes for %s %d != %d (errno=%d)", |
| path, length, (int)size, errno); |
| if (errno == 0 || errno == EINTERNAL) { |
| ret = -EIO; |
| } else { |
| ret = -errno; |
| } |
| } |
| if (length != size) { |
| ERROR("Could not write all bytes for %s %d != %d (errno=%d)", |
| path, length, (int)size, errno); |
| } |
| } |
| |
| // |
| // Critical section end |
| // |
| |
| pthread_mutex_unlock(&fh->mutex); |
| |
| return ret == 0 ? length : ret; |
| } |