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 *
10 * 2. Redistributions in binary form must reproduce the above copyright notice, this list
11 * of conditions and the following disclaimer in the documentation and/or other materials
12 * provided with the distribution.
13 *
14 * 3. Neither the name of the copyright holder nor the names of its contributors may be used
15 * to endorse or promote products derived from this software without specific prior written
16 * permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
20 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
21 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
22 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
23 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
24 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
25 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
26 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
27 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
28 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30 #include "vfs_files.h"
31 #include "errno.h"
32 #include "stdio.h"
33 #include "stdlib.h"
34 #include "string.h"
35 #include "los_config.h"
36 #include "vfs_config.h"
37 #include "vfs_mount.h"
38 #include "vfs_operations.h"
39
40 static struct File g_files[NR_OPEN_DEFAULT];
41
FileToFd(const struct File * file)42 int FileToFd(const struct File *file)
43 {
44 if (file == NULL) {
45 return (int)LOS_NOK;
46 }
47 return file - g_files + MIN_START_FD;
48 }
49
FdToFile(int fd)50 struct File *FdToFile(int fd)
51 {
52 if ((fd < MIN_START_FD) || (fd >= CONFIG_NFILE_DESCRIPTORS)) {
53 return NULL;
54 }
55 return &g_files[fd - MIN_START_FD];
56 }
57
VfsFileGet(void)58 struct File *VfsFileGet(void)
59 {
60 int i;
61 /* protected by g_fsMutex */
62 for (i = 0; i < NR_OPEN_DEFAULT; i++) {
63 if (g_files[i].fStatus == FILE_STATUS_NOT_USED) {
64 g_files[i].fStatus = FILE_STATUS_INITING;
65 return &g_files[i];
66 }
67 }
68
69 return NULL;
70 }
71
VfsFileGetSpec(int fd)72 struct File *VfsFileGetSpec(int fd)
73 {
74 if ((fd < MIN_START_FD) || (fd >= CONFIG_NFILE_DESCRIPTORS)) {
75 return NULL;
76 }
77 if (g_files[fd - MIN_START_FD].fStatus == FILE_STATUS_NOT_USED) {
78 g_files[fd - MIN_START_FD].fStatus = FILE_STATUS_INITING;
79 return &g_files[fd - MIN_START_FD];
80 }
81
82 return NULL;
83 }
84
VfsFilePut(struct File * file)85 void VfsFilePut(struct File *file)
86 {
87 if (file == NULL) {
88 return;
89 }
90 file->fFlags = 0;
91 file->fFops = NULL;
92 file->fData = NULL;
93 file->fMp = NULL;
94 file->fOffset = 0;
95 file->fOwner = -1;
96 file->fullPath = NULL;
97 file->fStatus = FILE_STATUS_NOT_USED;
98 }
99