xref: /kernel/liteos_m/components/fs/vfs/vfs_maps.c (revision 3d8536b4) 
1/*
2 * Copyright (c) 2022-2022 Huawei Device Co., Ltd. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without modification,
5 * are permitted provided that the following conditions are met:
6 *
7 * 1. Redistributions of source code must retain the above copyright notice, this list of
8 *    conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright notice, this list
10 *    of conditions and the following disclaimer in the documentation and/or other materials
11 *    provided with the distribution.
12 *
13 * 3. Neither the name of the copyright holder nor the names of its contributors may be used
14 *    to endorse or promote products derived from this software without specific prior written
15 *    permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
19 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
20 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
21 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
22 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
24 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
26 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
27 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30#include "vfs_maps.h"
31#include "vfs_operations.h"
32#include <stdlib.h>
33#include "securec.h"
34#include "los_debug.h"
35#include "los_compiler.h"
36#include "los_fs.h"
37
38struct FsMap *g_fsMap = NULL;
39
40struct FsMap *VfsFsMapGet(const char *fsType)
41{
42    struct FsMap *curr = g_fsMap;
43
44    (void)LOS_FsLock();
45    while (curr != NULL) {
46        if ((curr->fsType != NULL) && (fsType != NULL) &&
47            (strcmp(curr->fsType, fsType) == 0)) {
48            LOS_FsUnlock();
49            return curr;
50        }
51        curr = curr->next;
52    }
53
54    LOS_FsUnlock();
55    return NULL;
56}
57
58int OsFsRegister(const char *fsType, const struct MountOps *fsMops,
59                 const struct FileOps *fsFops, const struct FsManagement *fsMgt)
60{
61    size_t len;
62    if ((fsMops == NULL) || (fsFops == NULL)) {
63        VFS_ERRNO_SET(EINVAL);
64        return (int)LOS_NOK;
65    }
66
67    struct FsMap *newfs = (struct FsMap *)LOSCFG_FS_MALLOC_HOOK(sizeof(struct FsMap));
68    if (newfs == NULL) {
69        PRINT_ERR("Fs register malloc failed, fsType %s.\n", fsType);
70        VFS_ERRNO_SET(ENOMEM);
71        return (int)LOS_NOK;
72    }
73    (void)memset_s(newfs, sizeof(struct FsMap), 0, sizeof(struct FsMap));
74
75    len = strlen(fsType) + 1;
76    newfs->fsType = LOSCFG_FS_MALLOC_HOOK(len);
77    if (newfs->fsType == NULL) {
78        LOSCFG_FS_FREE_HOOK(newfs);
79        VFS_ERRNO_SET(ENOMEM);
80        return (int)LOS_NOK;
81    }
82    (void)strcpy_s((char *)newfs->fsType, len, fsType);
83
84    newfs->fsMops = fsMops;
85    newfs->fsFops = fsFops;
86    newfs->fsMgt = fsMgt;
87    newfs->fsRefs = 0;
88
89    (void)LOS_FsLock();
90    newfs->next = g_fsMap;
91    g_fsMap = newfs;
92
93    LOS_FsUnlock();
94    return LOS_OK;
95}
96
97int LOS_FsRegister(const char *fsType, const struct MountOps *fsMops,
98                   const struct FileOps *fsFops, const struct FsManagement *fsMgt)
99{
100    if (VfsFsMapGet(fsType) != NULL) {
101        PRINT_ERR("fsType has been registered or fsType error\n");
102        VFS_ERRNO_SET(EINVAL);
103        return (int)LOS_NOK;
104    }
105
106    return OsFsRegister(fsType, fsMops, fsFops, fsMgt);
107}
108