1. 下载安装
wget
tar zxvf fuse-2.9.1.tar.gz
cd fuse-2.9.1
./configure
make
sudo make install
2. 测试代码
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/*--------------------------------------------------------------------------------------------
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gcc -Wall -O2 hello.c -o hello `pkg-config fuse --cflags --libs`
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mkdir /tmp/fuse //在/tmp下建立fuse目录,用于挂载hello文件系统
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./hello /tmp/fuse //挂载hello文件系统
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ls -l /tmp/fuse //执行ls时,会调用到readdir函数,该函数会添加一个hello文件
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-r--r--r-- 1 root root 13 1970-01-01 07:00 hello
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cat /tmp/fuse/hello //执行cat 字符串hello_str中的内容读出
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fusermount -u /tmp/fuse //卸载hello文件系统
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---------------------------------------------------------------------------------------------*/
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#define FUSE_USE_VERSION 26 //先定义, fuse.h中有判断
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#include <fuse.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <fcntl.h>
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static const char *hello_str = "Hello World!\n";
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static const char *hello_path = "/hello";
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//该函数与stat()类似,用于得到文件的属性,将其存入到结构体struct stat中
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static int hello_getattr(const char *path, struct stat *stbuf)
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{
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int res = 0;
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memset(stbuf, 0, sizeof(struct stat)); //用于初始化结构体stat
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if (strcmp(path, "/") == 0) {
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stbuf->st_mode = S_IFDIR | 0755; //S_IFDIR 用于说明/为目录,详见S_IFDIR定义
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stbuf->st_nlink = 2; //文件链接数
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} else if (strcmp(path, hello_path) == 0) {
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stbuf->st_mode = S_IFREG | 0444; //S_IFREG用于说明/hello为常规文件
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stbuf->st_nlink = 1;
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stbuf->st_size = strlen(hello_str); //设置文件长度为hello_str的长度
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} else
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res = -ENOENT; //返回错误信息,没有该文件或目录
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return res; //执行成功返回0
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}
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//该函数用于读取目录中的内容,并在/目录下增加了. .. hello三个目录项
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static int hello_readdir(const char *path, void *buf, fuse_fill_dir_t filler,
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off_t offset, struct fuse_file_info *fi)
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{
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(void) offset;
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(void) fi;
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if (strcmp(path, "/") != 0)
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return -ENOENT;
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/* fill, 其作用是在readdir函数中增加一个目录项
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typedef int (*fuse_fill_dir_t) (void *buf, const char *name,
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const struct stat *stbuf, off_t off);
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*/
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filler(buf, ".", NULL, 0);
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filler(buf, "..", NULL, 0);
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filler(buf, hello_path + 1, NULL, 0); //指针+1(/hello), 即增加 hello 目录项
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return 0;
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}
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//打开文件
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static int hello_open(const char *path, struct fuse_file_info *fi)
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{
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if (strcmp(path, hello_path) != 0)
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return -ENOENT;
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if ((fi->flags & 3) != O_RDONLY)
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return -EACCES;
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return 0;
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}
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//读文件
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static int hello_read(const char *path, char *buf, size_t size, off_t offset,
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struct fuse_file_info *fi)
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{
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size_t len;
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(void) fi;
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if(strcmp(path, hello_path) != 0)
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return -ENOENT;
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len = strlen(hello_str);
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if (offset < len) {
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if (offset + size > len)
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size = len - offset;
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memcpy(buf, hello_str + offset, size);
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} else
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size = 0;
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return size;
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}
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//注册自定义函数
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static struct fuse_operations hello_oper = {
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.getattr = hello_getattr,
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.readdir = hello_readdir,
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.open = hello_open,
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.read = hello_read,
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};
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//只需调用fuse_main(),剩下的事就交给FUSE了*
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int main(int argc, char *argv[])
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{
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return fuse_main(argc, argv, &hello_oper, NULL);
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}
3.Makefile
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OPENWRT = 1
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ifeq ($(OPENWRT), 1)
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CC = ~/OpenWrt-SDK-ar71xx-for-linux-i486-gcc-4.6-linaro_uClibc-0.9.33.2/staging_dir/toolchain-mips_r2_gcc-4.6-linaro_uClibc-0.9.33.2/bin/mips-openwrt-linux-gcc
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CFLAGS += -I ~/openwrt-lib/include -L ~/openwrt-lib/lib
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else
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CC = gcc
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endif
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CFLAGS += -Wall -O2
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#CFLAGS += -g
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#可执行文件名和相关的obj文件
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APP_BINARY = hello_fuse
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SRCS += hello.c
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OBJS += hello.o
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all: APP_FILE
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hello.o:
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$(CC) $(CFLAGS) -c $(SRCS) `pkg-config fuse --cflags --libs`
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APP_FILE: $(OBJS)
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$(CC) $(CFLAGS) $(OBJS) -o $(APP_BINARY) $(LFLAGS) `pkg-config fuse --cflags --libs`
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.PHONY: clean
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clean:
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@echo "cleanning project"
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$(RM) *.a *.o *~ *.so *.lo $(APP_BINARY)
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@echo "clean completed"
测试过程:
$mkdir /tmp/fuse
$./hello /tmp/fuse
$ls -l /tmp/fuse
-r--r--r-- 1 root root 13 Jan 1 1970 hello
$cat /tmp/fuse/hello
Hello World!
$fusermount -u /tmp/fuse
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