1 /****************************************************************************
2 * fs/mount/fs_foreachmountpoint.c
3 *
4 * Copyright (c) 2023 Huawei Device Co., Ltd. All rights reserved.
5 * Based on NuttX originally from nuttx source (nuttx/fs/ and nuttx/drivers/)
6 *
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 *
19 ****************************************************************************/
20
21 /****************************************************************************
22 * Included Files
23 ****************************************************************************/
24 #include "vfs_config.h"
25 #include "fs/mount.h"
26 #include "vnode.h"
27
28 /****************************************************************************
29 * Public Functions
30 ****************************************************************************/
31
32 /****************************************************************************
33 * Name: foreach_mountpoint
34 *
35 * Description:
36 * Visit each mountpoint in the pseudo-file system. The traversal is
37 * terminated when the callback 'handler' returns a non-zero value, or when
38 * all of the mountpoints have been visited.
39 *
40 * This is just a front end "filter" to foreach_vnode() that forwards only
41 * mountpoint vnodes. It is intended to support the mount() command to
42 * when the mount command is used to enumerate mounts.
43 *
44 * NOTE 1: Use with caution... The pseudo-file system is locked throughout
45 * the traversal.
46 * NOTE 2: The search algorithm is recursive and could, in principle, use
47 * an indeterminant amount of stack space. This will not usually be a
48 * real work issue.
49 *
50 ****************************************************************************/
51
foreach_mountpoint(foreach_mountpoint_t handler,void * arg)52 int foreach_mountpoint(foreach_mountpoint_t handler, void *arg)
53 {
54 int ret;
55 struct Mount *mnt = NULL;
56 struct statfs statBuf = {0};
57 LIST_HEAD *mntList = GetMountList();
58 LOS_DL_LIST_FOR_EACH_ENTRY(mnt, mntList, struct Mount, mountList)
59 {
60 if (mnt->ops->Statfs != NULL)
61 {
62 ret = mnt->ops->Statfs(mnt, &statBuf);
63 if (ret == OK)
64 {
65 (void)handler(mnt->devName, mnt->pathName, &statBuf, arg);
66 }
67 }
68 }
69 return 0;
70 }
71