1 /****************************************************************************
2 * fs/inode/fs_inoderelease.c
3 *
4 * Copyright (C) 2007-2009 Gregory Nutt. All rights reserved.
5 * Author: Gregory Nutt <gnutt@nuttx.org>
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
16 * distribution.
17 * 3. Neither the name NuttX nor the names of its contributors may be
18 * used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
28 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
31 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
32 * POSSIBILITY OF SUCH DAMAGE.
33 *
34 ****************************************************************************/
35
36 /****************************************************************************
37 * Included Files
38 ****************************************************************************/
39
40 #include "vfs_config.h"
41 #include "errno.h"
42 #include "stdlib.h"
43 #include "fs/fs.h"
44 #include "inode/inode.h"
45
46 /****************************************************************************
47 * Public Functions
48 ****************************************************************************/
49
50 /****************************************************************************
51 * Name: inode_release
52 *
53 * Description:
54 * This is called from close() logic when it no longer refers to the inode.
55 *
56 ****************************************************************************/
57
inode_release(FAR struct inode * node)58 void inode_release(FAR struct inode *node)
59 {
60 if (node)
61 {
62 /* Decrement the references of the inode */
63
64 inode_semtake();
65 if (node->i_crefs)
66 {
67 node->i_crefs--;
68 }
69
70 /* If the subtree was previously deleted and the reference
71 * count has decrement to zero, then delete the inode
72 * now.
73 */
74
75 if (node->i_crefs <= 0 && (node->i_flags & FSNODEFLAG_DELETED) != 0)
76 {
77 /* If the inode has been properly unlinked, then the peer pointer
78 * should be NULL.
79 */
80
81 inode_free(node->i_child);
82 (void)LOS_MemFree(m_aucSysMem0, node);
83 inode_semgive();
84 }
85 else
86 {
87 inode_semgive();
88 }
89 }
90 }
91
92