1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
|
/****************************************************************************
* fs/fs_statfs.c
*
* Copyright (C) 2007-2009, 2012 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 "fs_internal.h"
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: statpsuedo
****************************************************************************/
static inline int statpsuedofs(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: stat
*
* Return: 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)
{
FAR struct inode *inode;
FAR const char *relpath = NULL;
int ret = OK;
/* Sanity checks */
if (!path || !buf)
{
ret = EFAULT;
goto errout;
}
if (!path[0])
{
ret = ENOENT;
goto errout;
}
/* Get an inode for this file */
inode = inode_find(path, &relpath);
if (!inode)
{
/* This name does not refer to a psudeo-inode and there is no
* mountpoint that includes in this path.
*/
ret = ENOENT;
goto errout;
}
/* 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 psuedo file system */
ret = statpsuedofs(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);
return OK;
/* Failure conditions always set the errno appropriately */
errout_with_inode:
inode_release(inode);
errout:
set_errno(ret);
return ERROR;
}
|
