163 lines
4.3 KiB
C
163 lines
4.3 KiB
C
/****************************************************************************
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* fs/vfs/fs_statfs.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/statfs.h>
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#include <string.h>
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#include <limits.h>
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#include <sched.h>
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#include <assert.h>
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#include <errno.h>
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#include "inode/inode.h"
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: statpseudo
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****************************************************************************/
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static int statpseudofs(FAR struct inode *inode, FAR struct statfs *buf)
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{
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memset(buf, 0, sizeof(struct statfs));
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buf->f_type = PROC_SUPER_MAGIC;
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buf->f_namelen = NAME_MAX;
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return OK;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: statfs
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*
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* Returned Value:
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* Zero on success; -1 on failure with errno set:
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*
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* EACCES Search permission is denied for one of the directories in the
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* path prefix of path.
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* EFAULT Bad address.
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* ENOENT A component of the path path does not exist, or the path is an
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* empty string.
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* ENOMEM Out of memory
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* ENOTDIR A component of the path is not a directory.
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* ENOSYS The file system does not support this call.
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*
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****************************************************************************/
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int statfs(FAR const char *path, FAR struct statfs *buf)
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{
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struct inode_search_s desc;
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FAR struct inode *inode;
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int ret = OK;
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/* Sanity checks */
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if (path == NULL || buf == NULL)
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{
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ret = -EFAULT;
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goto errout;
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}
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if (*path == '\0')
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{
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ret = -ENOENT;
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goto errout;
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}
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/* Get an inode for this file */
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SETUP_SEARCH(&desc, path, false);
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ret = inode_find(&desc);
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if (ret < 0)
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{
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/* This name does not refer to a psudeo-inode and there is no
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* mountpoint that includes in this path.
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*/
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goto errout_with_search;
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}
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/* Get the search results */
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inode = desc.node;
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DEBUGASSERT(inode != NULL);
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/* The way we handle the statfs depends on the type of inode that we
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* are dealing with.
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*/
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#ifndef CONFIG_DISABLE_MOUNTPOINT
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if (INODE_IS_MOUNTPT(inode))
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{
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/* The node is a file system mointpoint. Verify that the mountpoint
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* supports the statfs() method
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*/
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if (inode->u.i_mops && inode->u.i_mops->statfs)
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{
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/* Perform the statfs() operation */
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ret = inode->u.i_mops->statfs(inode, buf);
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}
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}
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else
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#endif
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{
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/* The node is part of the root pseudo file system */
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ret = statpseudofs(inode, buf);
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}
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/* Check if the statfs operation was successful */
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if (ret < 0)
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{
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goto errout_with_inode;
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}
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/* Successfully statfs'ed the file */
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inode_release(inode);
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RELEASE_SEARCH(&desc);
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return OK;
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/* Failure conditions always set the errno appropriately */
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errout_with_inode:
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inode_release(inode);
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errout_with_search:
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RELEASE_SEARCH(&desc);
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errout:
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set_errno(-ret);
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return ERROR;
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}
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