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
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228/****************************************************************************
* fs/vfs/fs_unlink.c
*
* SPDX-License-Identifier: Apache-2.0
*
* 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdbool.h>
#include <unistd.h>
#include <assert.h>
#include <errno.h>
#include <nuttx/fs/fs.h>
#include "inode/inode.h"
#include "vfs.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#undef FS_HAVE_UNLINK
#if !defined(CONFIG_DISABLE_MOUNTPOINT) || !defined(CONFIG_DISABLE_PSEUDOFS_OPERATIONS)
# define FS_HAVE_UNLINK 1
#endif
#ifdef FS_HAVE_UNLINK
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: nx_unlink
*
* Description: Remove a file managed a mountpoint
*
****************************************************************************/
int nx_unlink(FAR const char *pathname)
{
struct inode_search_s desc;
FAR struct inode *inode;
int ret;
/* Get an inode for this file (without deference the final node in the path
* which may be a symbolic link)
*/
SETUP_SEARCH(&desc, pathname, true);
ret = inode_find(&desc);
if (ret < 0)
{
/* There is no inode that includes in this path */
goto errout_with_search;
}
/* Get the search results */
inode = desc.node;
DEBUGASSERT(inode != NULL);
#ifndef CONFIG_DISABLE_MOUNTPOINT
/* Check if the inode is a valid mountpoint. */
if (INODE_IS_MOUNTPT(inode) && inode->u.i_mops)
{
/* Perform the unlink operation using the relative path at the
* mountpoint.
*/
if (inode->u.i_mops->unlink)
{
ret = inode->u.i_mops->unlink(inode, desc.relpath);
if (ret < 0)
{
goto errout_with_inode;
}
}
else
{
ret = -ENOSYS;
goto errout_with_inode;
}
}
else
#endif
{
#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
/* Refuse to unlink the inode if it has children. I.e., if it is
* functioning as a directory and the directory is not empty.
*/
if (inode->i_child != NULL)
{
ret = -ENOTEMPTY;
goto errout_with_inode;
}
/* Notify the driver that it has been unlinked. If there are no
* open references to the driver instance, then the driver should
* release all resources because it is no longer accessible.
*/
if ((INODE_IS_DRIVER(inode) || INODE_IS_SHM(inode) ||
INODE_IS_PIPE(inode)) && inode->u.i_ops->unlink)
{
/* Notify the character driver that it has been unlinked */
ret = inode->u.i_ops->unlink(inode);
if (ret < 0)
{
goto errout_with_inode;
}
}
#ifndef CONFIG_DISABLE_MOUNTPOINT
else if (INODE_IS_BLOCK(inode) && inode->u.i_bops->unlink)
{
/* Notify the block driver that it has been unlinked */
ret = inode->u.i_bops->unlink(inode);
if (ret < 0)
{
goto errout_with_inode;
}
}
#endif
#ifdef CONFIG_PSEUDOFS_SOFTLINKS
else if (INODE_IS_PSEUDODIR(inode) || INODE_IS_SOFTLINK(inode))
#else
else if (INODE_IS_PSEUDODIR(inode))
#endif
{
/* If this is a "dangling" pseudo-file node
* (i.e., it has no operations) or a soft link,
* then rm should remove the node.
*/
}
else
{
ret = -ENXIO;
goto errout_with_inode;
}
/* Remove the old inode. Because we hold a reference count on the
* inode, it will not be deleted now. It will be deleted when all
* of the references to the inode have been released (perhaps
* when inode_release() is called below). inode_remove() will
* return -EBUSY to indicate that the inode was not deleted now.
*/
inode_lock();
ret = inode_remove(pathname);
inode_unlock();
if (ret < 0 && ret != -EBUSY)
{
goto errout_with_inode;
}
#endif
}
/* Successfully unlinked */
inode_release(inode);
RELEASE_SEARCH(&desc);
#ifdef CONFIG_FS_NOTIFY
notify_unlink(pathname);
#endif
return OK;
#if !defined(CONFIG_DISABLE_MOUNTPOINT) || !defined(CONFIG_DISABLE_PSEUDOFS_OPERATIONS)
errout_with_inode:
inode_release(inode);
#endif
errout_with_search:
RELEASE_SEARCH(&desc);
return ret;
}
/****************************************************************************
* Name: unlink
*
* Description: Remove a file managed a mountpoint
*
****************************************************************************/
int unlink(FAR const char *pathname)
{
int ret;
ret = nx_unlink(pathname);
if (ret < 0)
{
set_errno(-ret);
return ERROR;
}
return OK;
}
#endif /* FS_HAVE_UNLINK */