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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 
38 struct FsMap *g_fsMap = NULL;
39 
VfsFsMapGet(const char * fsType)40 struct 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 
OsFsRegister(const char * fsType,const struct MountOps * fsMops,const struct FileOps * fsFops,const struct FsManagement * fsMgt)58 int 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 
LOS_FsRegister(const char * fsType,const struct MountOps * fsMops,const struct FileOps * fsFops,const struct FsManagement * fsMgt)97 int 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