fuse_impls_statfs.c
上传用户:quxuerui
上传日期:2018-01-08
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文件大小:3k
- /**
- * 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"
- int dfs_statfs(const char *path, struct statvfs *st)
- {
- TRACE1("statfs",path)
- // retrieve dfs specific data
- dfs_context *dfs = (dfs_context*)fuse_get_context()->private_data;
- // check params and the context var
- assert(path);
- assert(st);
- assert(dfs);
- // init the stat structure
- memset(st,0,sizeof(struct statvfs));
- hdfsFS userFS;
- // if not connected, try to connect and fail out if we can't.
- if ((userFS = doConnectAsUser(dfs->nn_hostname,dfs->nn_port))== NULL) {
- syslog(LOG_ERR, "ERROR: could not connect to dfs %s:%dn", __FILE__, __LINE__);
- return -EIO;
- }
- const long cap = hdfsGetCapacity(userFS);
- const long used = hdfsGetUsed(userFS);
- const long bsize = hdfsGetDefaultBlockSize(userFS);
- // fill in the statvfs structure
- /* FOR REFERENCE:
- struct statvfs {
- unsigned long f_bsize; // file system block size
- unsigned long f_frsize; // fragment size
- fsblkcnt_t f_blocks; // size of fs in f_frsize units
- fsblkcnt_t f_bfree; // # free blocks
- fsblkcnt_t f_bavail; // # free blocks for non-root
- fsfilcnt_t f_files; // # inodes
- fsfilcnt_t f_ffree; // # free inodes
- fsfilcnt_t f_favail; // # free inodes for non-root
- unsigned long f_fsid; // file system id
- unsigned long f_flag; / mount flags
- unsigned long f_namemax; // maximum filename length
- };
- */
- st->f_bsize = bsize;
- st->f_frsize = bsize;
- st->f_blocks = cap/bsize;
- st->f_bfree = (cap-used)/bsize;
- st->f_bavail = (cap-used)/bsize;
- st->f_files = 1000;
- st->f_ffree = 500;
- st->f_favail = 500;
- st->f_fsid = 1023;
- st->f_flag = ST_RDONLY | ST_NOSUID;
- st->f_namemax = 1023;
- return 0;
- }