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 40static struct File g_files[NR_OPEN_DEFAULT]; 41 42int 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 50struct 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 58struct 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 72struct 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 85void 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