1 /****************************************************************************
2 * fs/mount/fs_foreachmountpoint.c
3 *
4 * Copyright (C) 2012 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 #include "vfs_config.h"
40 #include "fs/mount.h"
41 #include "vnode.h"
42
43 /****************************************************************************
44 * Public Functions
45 ****************************************************************************/
46
47 /****************************************************************************
48 * Name: foreach_mountpoint
49 *
50 * Description:
51 * Visit each mountpoint in the pseudo-file system. The traversal is
52 * terminated when the callback 'handler' returns a non-zero value, or when
53 * all of the mountpoints have been visited.
54 *
55 * This is just a front end "filter" to foreach_vnode() that forwards only
56 * mountpoint vnodes. It is intended to support the mount() command to
57 * when the mount command is used to enumerate mounts.
58 *
59 * NOTE 1: Use with caution... The pseudo-file system is locked throughout
60 * the traversal.
61 * NOTE 2: The search algorithm is recursive and could, in principle, use
62 * an indeterminant amount of stack space. This will not usually be a
63 * real work issue.
64 *
65 ****************************************************************************/
66
foreach_mountpoint(foreach_mountpoint_t handler,void * arg)67 int foreach_mountpoint(foreach_mountpoint_t handler, void *arg)
68 {
69 int ret;
70 struct Mount *mnt = NULL;
71 struct statfs statBuf = {0};
72 LIST_HEAD *mntList = GetMountList();
73 LOS_DL_LIST_FOR_EACH_ENTRY(mnt, mntList, struct Mount, mountList)
74 {
75 if (mnt->ops->Statfs != NULL)
76 {
77 ret = mnt->ops->Statfs(mnt, &statBuf);
78 if (ret == OK)
79 {
80 (void)handler(mnt->devName, mnt->pathName, &statBuf, arg);
81 }
82 }
83 }
84 return 0;
85 }
86