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- /****************************************************************************
- * fs/vfs/fs_statfs.c
- *
- * Copyright (C) 2007-2009, 2012, 2017 Gregory Nutt. All rights reserved.
- * Author: Gregory Nutt <gnutt@nuttx.org>
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- * 3. Neither the name NuttX nor the names of its contributors may be
- * used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
- * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- ****************************************************************************/
- /****************************************************************************
- * Included Files
- ****************************************************************************/
- #include <nuttx/config.h>
- #include <sys/statfs.h>
- #include <string.h>
- #include <limits.h>
- #include <sched.h>
- #include <errno.h>
- #include "inode/inode.h"
- /****************************************************************************
- * Private Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: statpseudo
- ****************************************************************************/
- static int statpseudofs(FAR struct inode *inode, FAR struct statfs *buf)
- {
- memset(buf, 0, sizeof(struct statfs));
- buf->f_type = PROC_SUPER_MAGIC;
- buf->f_namelen = NAME_MAX;
- return OK;
- }
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: statfs
- *
- * Returned Value:
- * Zero on success; -1 on failure with errno set:
- *
- * EACCES Search permission is denied for one of the directories in the
- * path prefix of path.
- * EFAULT Bad address.
- * ENOENT A component of the path path does not exist, or the path is an
- * empty string.
- * ENOMEM Out of memory
- * ENOTDIR A component of the path is not a directory.
- * ENOSYS The file system does not support this call.
- *
- ****************************************************************************/
- int statfs(FAR const char *path, FAR struct statfs *buf)
- {
- struct inode_search_s desc;
- FAR struct inode *inode;
- int ret = OK;
- /* Sanity checks */
- if (path == NULL || buf == NULL)
- {
- ret = EFAULT;
- goto errout;
- }
- if (*path == '\0')
- {
- ret = ENOENT;
- goto errout;
- }
- /* Get an inode for this file */
- SETUP_SEARCH(&desc, path, false);
- ret = inode_find(&desc);
- if (ret < 0)
- {
- /* This name does not refer to a psudeo-inode and there is no
- * mountpoint that includes in this path.
- */
- ret = -ret;
- goto errout_with_search;
- }
- /* Get the search results */
- inode = desc.node;
- DEBUGASSERT(inode != NULL);
- /* The way we handle the statfs depends on the type of inode that we
- * are dealing with.
- */
- #ifndef CONFIG_DISABLE_MOUNTPOINT
- if (INODE_IS_MOUNTPT(inode))
- {
- /* The node is a file system mointpoint. Verify that the mountpoint
- * supports the statfs() method
- */
- if (inode->u.i_mops && inode->u.i_mops->statfs)
- {
- /* Perform the statfs() operation */
- ret = inode->u.i_mops->statfs(inode, buf);
- }
- }
- else
- #endif
- {
- /* The node is part of the root pseudo file system */
- ret = statpseudofs(inode, buf);
- }
- /* Check if the statfs operation was successful */
- if (ret < 0)
- {
- ret = -ret;
- goto errout_with_inode;
- }
- /* Successfully statfs'ed the file */
- inode_release(inode);
- RELEASE_SEARCH(&desc);
- return OK;
- /* Failure conditions always set the errno appropriately */
- errout_with_inode:
- inode_release(inode);
- errout_with_search:
- RELEASE_SEARCH(&desc);
- errout:
- set_errno(ret);
- return ERROR;
- }
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