xref: /kernel/liteos_a/fs/proc/os_adapt/mounts_proc.c (revision 0d163575) 
1/*
2 * Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
3 * Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without modification,
6 * are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this list of
9 *    conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice, this list
12 *    of conditions and the following disclaimer in the documentation and/or other materials
13 *    provided with the distribution.
14 *
15 * 3. Neither the name of the copyright holder nor the names of its contributors may be used
16 *    to endorse or promote products derived from this software without specific prior written
17 *    permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
21 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
26 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
27 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
28 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
29 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include "proc_fs.h"
33
34#include <stdio.h>
35#include <sys/mount.h>
36#include <sys/statfs.h>
37
38#include "fs/mount.h"
39#include "internal.h"
40
41static int ShowType(const char *devPoint, const char *mountPoint, struct statfs *statBuf, void *arg)
42{
43    struct SeqBuf *seqBuf = (struct SeqBuf *)arg;
44    char *type = NULL;
45
46    switch (statBuf->f_type) {
47        case PROCFS_MAGIC:
48            type = "proc";
49            break;
50        case JFFS2_SUPER_MAGIC:
51            type = "jffs2";
52            break;
53        case NFS_SUPER_MAGIC:
54            type = "nfs";
55            break;
56        case TMPFS_MAGIC:
57            type = "tmpfs";
58            break;
59        case MSDOS_SUPER_MAGIC:
60            type = "vfat";
61            break;
62        case ZPFS_MAGIC:
63            type = "zpfs";
64            break;
65        default:
66            return 0;
67    }
68
69    if (strlen(devPoint) == 0) {
70        (void)LosBufPrintf(seqBuf, "%s %s %s %s %d %d\n", type, mountPoint, type, "()", 0, 0);
71    } else {
72        (void)LosBufPrintf(seqBuf, "%s %s %s %s %d %d\n", devPoint, mountPoint, type, "()", 0, 0);
73    }
74
75    return 0;
76}
77
78static int MountsProcFill(struct SeqBuf *m, void *v)
79{
80    foreach_mountpoint_t handler = ShowType;
81    (void)foreach_mountpoint(handler, (void *)m);
82
83    return 0;
84}
85
86static const struct ProcFileOperations MOUNTS_PROC_FOPS = {
87    .read = MountsProcFill,
88};
89
90void ProcMountsInit(void)
91{
92    struct ProcDirEntry *pde = CreateProcEntry("mounts", 0, NULL);
93    if (pde == NULL) {
94        PRINT_ERR("create mounts error!\n");
95        return;
96    }
97
98    pde->procFileOps = &MOUNTS_PROC_FOPS;
99}
100
101