更新日期: 2022/06/01 来源: https://gitee.com/weharmony/kernel_liteos_a_note
vfs_config.h
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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
33#ifndef _VFS_CONFIG_H_
34#define _VFS_CONFIG_H_
35
36#include "los_config.h"
37
38#ifdef __cplusplus
39#if __cplusplus
40extern "C" {
41#endif /* __cplusplus */
42#endif /* __cplusplus */
43//禁用 posix mqueue inode 配置
44#define PATH_MAX 256
45#define CONFIG_DISABLE_MQUEUE // disable posix mqueue inode configure
46
47/* file system configure */ //文件系统配置
48
49#define CONFIG_FS_WRITABLE // enable file system can be written 使能文件系统可写
50#define CONFIG_FS_READABLE // enable file system can be read 使能文件系统可读
51#define CONFIG_DEBUG_FS // enable vfs debug function 使能文件系统可调试
52
53
54/* fatfs cache configure */ //fatfs缓存配置
55/* config block size for fat file system, only can be 0,32,64,128,256,512,1024 */
56#define CONFIG_FS_FAT_SECTOR_PER_BLOCK 64 //块（Block）是文件系统存取数据的最小单位
57//64个512扇区,即 32K
58/* config block num for fat file system */
59#define CONFIG_FS_FAT_READ_NUMS 7
60#define CONFIG_FS_FAT_BLOCK_NUMS 28
61
62#ifdef LOSCFG_FS_FAT_CACHE_SYNC_THREAD
63
64/* config the priority of sync task */
65
66#define CONFIG_FS_FAT_SYNC_THREAD_PRIO 10 //配置同步任务的优先级
67
68/* config dirty ratio of bcache for fat file system */
69
70#define CONFIG_FS_FAT_DIRTY_RATIO 60
71
72/* config time interval of sync thread for fat file system, in milliseconds */
73//配置 FAT 文件系统同步线程的时间间隔，单位为毫秒
74#define CONFIG_FS_FAT_SYNC_INTERVAL 5000 //5秒钟
75#endif
76
77#define CONFIG_FS_FLASH_BLOCK_NUM 1
78
79#define CONFIG_FS_MAX_LNK_CNT 40
80/* nfs configure */
81
82#define CONFIG_NFS_MACHINE_NAME "IPC" // nfs device name is IPC
83#define CONFIG_NFS_MACHINE_NAME_SIZE 3 // size of nfs machine name
84
85
86/* file descriptors configure */
87
88#define CONFIG_NFILE_STREAMS 1 // enable file stream
89#define CONFIG_STDIO_BUFFER_SIZE 0
90#define CONFIG_NUNGET_CHARS 0
91#define MIN_START_FD 3 // 0,1,2 are used for stdin,stdout,stderr respectively
92
93#define FD_SET_TOTAL_SIZE (FD_SETSIZE + CONFIG_NEXPANED_DESCRIPTORS)
94#define FD_SETSIZE (CONFIG_NFILE_DESCRIPTORS + CONFIG_NSOCKET_DESCRIPTORS)
95#define CONFIG_NEXPANED_DESCRIPTORS (CONFIG_NTIME_DESCRIPTORS + CONFIG_NQUEUE_DESCRIPTORS)
96#define TIMER_FD_OFFSET FD_SETSIZE
97#define MQUEUE_FD_OFFSET (FD_SETSIZE + CONFIG_NTIME_DESCRIPTORS)
98#define EPOLL_FD_OFFSET (FD_SETSIZE + CONFIG_NTIME_DESCRIPTORS + CONFIG_NQUEUE_DESCRIPTORS)
99
100/* net configure */
101
102#ifdef LOSCFG_NET_LWIP_SACK // enable socket and net function 使能网络功能
103#include "lwip/lwipopts.h"
104#define CONFIG_NSOCKET_DESCRIPTORS LWIP_CONFIG_NUM_SOCKETS // max numbers of socket descriptor 套接字描述符的最大数量
105
106/* max numbers of other descriptors except socket descriptors */
107//除套接字描述符外的其他描述符的最大数量
108#define CONFIG_NFILE_DESCRIPTORS 512 // 系统文件描述符数量
109#define CONFIG_NET_SENDFILE 1 // enable sendfile function //因打开网络开关,所以同时也打开发送文件开关
110#define CONFIG_NET_TCP 1 // enable sendfile and send function //使能 发送文件和数据功能
111#else
112#define CONFIG_NSOCKET_DESCRIPTORS 0 // 关闭网络开关,当然NFS的数量为0,鸿蒙和LINUX一样,一切皆为文件,而是文件就需要文件描述符(FD)
113#define CONFIG_NFILE_DESCRIPTORS 512 // 系统文件描述符数量
114#define CONFIG_NET_SENDFILE 0 // disable sendfile function //禁用发送文件功能
115#define CONFIG_NET_TCP 0 // disable sendfile and send function //禁用sendfile和send函数功能
116#endif
117
118#define NR_OPEN_DEFAULT CONFIG_NFILE_DESCRIPTORS
119
120/* time configure */
121
122#define CONFIG_NTIME_DESCRIPTORS 0
123
124/* mqueue configure */
125
126#define CONFIG_NQUEUE_DESCRIPTORS 256
127
128/* directory configure */
129
130#define VFS_USING_WORKDIR // enable current working directory
131
132#define CONFIG_EPOLL_DESCRIPTORS 32
133
134/* permission configure */
135#define DEFAULT_DIR_MODE 0777
136#define DEFAULT_FILE_MODE 0666
137
138#define MAX_DIRENT_NUM 14 // 14 means 4096 length buffer can store 14 dirent, see struct DIR
139
140#ifdef __cplusplus
141#if __cplusplus
142}
143#endif /* __cplusplus */
144#endif /* __cplusplus */
145#endif
los_config.h