2020-09-08 10:21:39 +08:00
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/*
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2021-03-11 18:43:57 +08:00
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* Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
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* Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
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2020-09-08 10:21:39 +08:00
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this list of
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* conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice, this list
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* of conditions and the following disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _VFS_CONFIG_H_
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#define _VFS_CONFIG_H_
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#include "los_config.h"
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#ifdef __cplusplus
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#if __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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#endif /* __cplusplus */
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#define CONFIG_DISABLE_MQUEUE // disable posix mqueue inode configure
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/* file system configur */
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#define CONFIG_FS_WRITABLE // enable file system can be written
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#define CONFIG_FS_READABLE // enable file system can be read
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#define CONFIG_DEBUG_FS // enable vfs debug function
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/* fatfs cache configur */
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/* config block size for fat file system, only can be 0,32,64,128,256,512,1024 */
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#define CONFIG_FS_FAT_SECTOR_PER_BLOCK 64
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/* config block num for fat file system */
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#define CONFIG_FS_FAT_READ_NUMS 7
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#define CONFIG_FS_FAT_BLOCK_NUMS 28
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#ifdef LOSCFG_FS_FAT_CACHE_SYNC_THREAD
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/* config the priority of sync task */
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#define CONFIG_FS_FAT_SYNC_THREAD_PRIO 10
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/* config dirty ratio of bcache for fat file system */
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2021-03-11 18:43:57 +08:00
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#define CONFIG_FS_FAT_DIRTY_RATIO 60
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2020-09-08 10:21:39 +08:00
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/* config time interval of sync thread for fat file system, in milliseconds */
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#define CONFIG_FS_FAT_SYNC_INTERVAL 5000
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#endif
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#define CONFIG_FS_FLASH_BLOCK_NUM 1
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feat: support link/symlink/readlink
新增link/symlink/readlink接口的系统调用及内核实现，当前仅支持jffs2文件系统。具体接口说明如下：
一、hard link
接口原型：
int link(const char *oldpath, const char *newpath);
int linkat(int olddirfd, const char *oldpath, int newdirfd, const char *newpath, int flags);
作用：
创建oldpath的硬链接，名为newpath。
功能说明：
1、newpath与oldpath必须在同一挂载分区内。
2、若newpath已存在，不会覆盖，错误码EEXIST。
3、oldpath必须为普通文件或者软链接文件。
4、如果oldpath是一个软链接文件，那么：
若调用link接口或者linkat（flags=0），创建出软链接文件的硬链接；
若调用linkat（flags = AT_SYMLINK_FOLLOW），创建出软链接所指向源文件的硬链接。
5、oldpath与newpath对应同一个文件，对oldpath与newpath任一名字的操作都是直接操作文件，没有“原始文件”的说法。
6、使用cp命令拷贝一个硬链接文件，生成文件的拷贝，新文件的nlink数为1。
7、删除oldpath或newpath，底层文件仍存在，可以通过另一个path访问。只有当两个path都删除之后，才会真正将文件删除，空间释放。
二、symbol link
接口原型：
int symlink(const char *target, const char *linkpath);
int symlinkat(const char *target, int newdirfd, const char *linkpath);
作用：
创建一个软链接文件linkpath，存储字符串target。
功能说明：
1、target可以为任意字符串（长度小于PATH_MAX）。
2、若linkpath文件名已存在，不会覆盖，错误码EEXIST。
3、用readlink函数可读取软链接的target内容。
4、软链接文件本身大小为target长度。
5、ls时软链接文件类型显示为 'l'。
6、symlink最大循环次数为CONFIG_FS_MAX_LNK_CNT（目前为40），超出则返回错误，错误码ELOOP。
7、使用cp命令拷贝一个软链接文件：
若target是一个文件：创建一个源文件的拷贝，类型为普通文件；
若target非文件：拷贝失败。
三、readlink
接口原型：
ssize_t readlink(const char *pathname, char *buf, size_t bufsiz);
ssize_t readlinkat(int dirfd, const char *pathname, char *buf, size_t bufsiz);
作用：
读取软链接文件存放的的target内容。
功能说明：
1、pathname必须为软链接文件，否则错误码EINVAL。
2、如果bufsiz小于target长度，则截断target。
close #I3Q0OD
Change-Id: I3864d6069b627b705a369e8e32dc1eb922dc0157
Signed-off-by: chenjing <chenjing139@huawei.com>
2021-06-04 10:30:12 +08:00
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#define CONFIG_FS_MAX_LNK_CNT 40
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2020-09-08 10:21:39 +08:00
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/* nfs configure */
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#define CONFIG_NFS_MACHINE_NAME "IPC" // nfs device name is IPC
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#define CONFIG_NFS_MACHINE_NAME_SIZE 3 // size of nfs machine name
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/* file descriptors configure */
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#define CONFIG_NFILE_STREAMS 1 // enable file stream
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#define CONFIG_STDIO_BUFFER_SIZE 0
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#define CONFIG_NUNGET_CHARS 0
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2021-03-11 18:43:57 +08:00
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#define FD_SET_TOTAL_SIZE (FD_SETSIZE + CONFIG_NEXPANED_DESCRIPTORS)
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#define FD_SETSIZE (CONFIG_NFILE_DESCRIPTORS + CONFIG_NSOCKET_DESCRIPTORS)
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#define CONFIG_NEXPANED_DESCRIPTORS (CONFIG_NTIME_DESCRIPTORS + CONFIG_NQUEUE_DESCRIPTORS)
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#define TIMER_FD_OFFSET FD_SETSIZE
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#define MQUEUE_FD_OFFSET (FD_SETSIZE + CONFIG_NTIME_DESCRIPTORS)
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2020-09-08 10:21:39 +08:00
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/* net configure */
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#ifdef LOSCFG_NET_LWIP_SACK // enable socket and net function
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#include "lwip/lwipopts.h"
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#define CONFIG_NSOCKET_DESCRIPTORS LWIP_CONFIG_NUM_SOCKETS // max numbers of socket descriptor
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/* max numbers of other descriptors except socket descriptors */
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#define CONFIG_NFILE_DESCRIPTORS 512
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#define CONFIG_NET_SENDFILE 1 // enable sendfile function
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#define CONFIG_NET_TCP 1 // enable sendfile and send function
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#else
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#define CONFIG_NSOCKET_DESCRIPTORS 0
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#define CONFIG_NFILE_DESCRIPTORS 512
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#define CONFIG_NET_SENDFILE 0 // disable sendfile function
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#define CONFIG_NET_TCP 0 // disable sendfile and send function
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#endif
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#define NR_OPEN_DEFAULT CONFIG_NFILE_DESCRIPTORS
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2021-03-11 18:43:57 +08:00
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/* time configure */
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#define CONFIG_NTIME_DESCRIPTORS 0
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/* mqueue configure */
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#define CONFIG_NQUEUE_DESCRIPTORS 256
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2020-09-08 10:21:39 +08:00
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/* directory configure */
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#define VFS_USING_WORKDIR // enable current working directory
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#ifdef __cplusplus
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#if __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* __cplusplus */
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#endif
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