1、使用ssh客户端，登陆ubuntu
ssh -p 2206 root@127.0.0.1
2、下载fuse源码，进行编译，安装(当前工作目录为~)
wget https://github.com/libfuse/libfuse/releases/download/fuse-3.0.0rc3/fuse-3.0.0rc3.tar.gz tar xvf fuse-3.0.0rc3.tar.gz cd fuse-3.0.0rc3/ ./configure make -j8 make install depmod modprobe fuse
3、测试example\hello_ll是否能正常工作
cd example/ ./hello_ll --help ./hello_ll /mnt mount cd /mnt ls cat hello cd umount /mnt
针对example\hello_ll.c，进行改动测试：
1、在根目录下多创建一个文件出来，节点号定为5，名称为frombyte，内容为文本"http://www.datahf.net"
改动如下：
/*
FUSE: Filesystem in Userspace
Copyright (C) 2001-2007 Miklos Szeredi <miklos@szeredi.hu>
This program can be distributed under the terms of the GNU GPL.
See the file COPYING.
*/
/** @file
*
* minimal example filesystem using low-level API
*
* Compile with:
*
* gcc -Wall hello_ll.c `pkg-config fuse3 --cflags --libs` -o hello_ll
*
* ## Source code ##
* \include hello_ll.c
*/
#define FUSE_USE_VERSION 30
#include <config.h>
#include <fuse_lowlevel.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <assert.h>
static const char *hello_str = "Hello World!\n";
static const char *hello_name = "hello";
//change1 #0
static const char *inode5_str = "http://www.datahf.net!\n";
static const char *inode5_name = "frombyte";
//change end
static int hello_stat(fuse_ino_t ino, struct stat *stbuf)
{
stbuf->st_ino = ino;
switch (ino) {
case 1:
stbuf->st_mode = S_IFDIR | 0755;
stbuf->st_nlink = 2;
break;
case 2:
stbuf->st_mode = S_IFREG | 0444;
stbuf->st_nlink = 1;
stbuf->st_size = strlen(hello_str);
break;
//change1 #1
case 5:
stbuf->st_mode = S_IFREG | 0444;
stbuf->st_nlink = 1;
stbuf->st_size = strlen(inode5_str);
break;
//change1 end
default:
return -1;
}
return 0;
}
static void hello_ll_getattr(fuse_req_t req, fuse_ino_t ino,
struct fuse_file_info *fi)
{
struct stat stbuf;
(void) fi;
memset(&stbuf, 0, sizeof(stbuf));
if (hello_stat(ino, &stbuf) == -1)
fuse_reply_err(req, ENOENT);
else
fuse_reply_attr(req, &stbuf, 1.0);
}
static void hello_ll_lookup(fuse_req_t req, fuse_ino_t parent, const char *name)
{
struct fuse_entry_param e;
//change1 #2
/*
if (parent != 1 || strcmp(name, hello_name) != 0)
fuse_reply_err(req, ENOENT);
else {
memset(&e, 0, sizeof(e));
e.ino = 2;
e.attr_timeout = 1.0;
e.entry_timeout = 1.0;
hello_stat(e.ino, &e.attr);
fuse_reply_entry(req, &e);
}*/
if (parent != 1)
fuse_reply_err(req, ENOENT);
else if(strcmp(name, hello_name) == 0){
memset(&e, 0, sizeof(e));
e.ino = 2;
e.attr_timeout = 1.0;
e.entry_timeout = 1.0;
hello_stat(e.ino, &e.attr);
fuse_reply_entry(req, &e);
}
else if(strcmp(name, inode5_name) == 0){
memset(&e, 0, sizeof(e));
e.ino = 5;
e.attr_timeout = 1.0;
e.entry_timeout = 1.0;
hello_stat(e.ino, &e.attr);
fuse_reply_entry(req, &e);
}
else
fuse_reply_err(req, ENOENT);
//change1 end
}
struct dirbuf {
char *p;
size_t size;
};
static void dirbuf_add(fuse_req_t req, struct dirbuf *b, const char *name,
fuse_ino_t ino)
{
struct stat stbuf;
size_t oldsize = b->size;
b->size += fuse_add_direntry(req, NULL, 0, name, NULL, 0);
b->p = (char *) realloc(b->p, b->size);
memset(&stbuf, 0, sizeof(stbuf));
stbuf.st_ino = ino;
fuse_add_direntry(req, b->p + oldsize, b->size - oldsize, name, &stbuf,
b->size);
}
#define min(x, y) ((x) < (y) ? (x) : (y))
static int reply_buf_limited(fuse_req_t req, const char *buf, size_t bufsize,
off_t off, size_t maxsize)
{
if (off < bufsize)
return fuse_reply_buf(req, buf + off,
min(bufsize - off, maxsize));
else
return fuse_reply_buf(req, NULL, 0);
}
static void hello_ll_readdir(fuse_req_t req, fuse_ino_t ino, size_t size,
off_t off, struct fuse_file_info *fi)
{
(void) fi;
if (ino != 1)
fuse_reply_err(req, ENOTDIR);
else {
struct dirbuf b;
memset(&b, 0, sizeof(b));
dirbuf_add(req, &b, ".", 1);
dirbuf_add(req, &b, "..", 1);
dirbuf_add(req, &b, hello_name, 2);
//change1
dirbuf_add(req, &b, inode5_name, 5);
//end
reply_buf_limited(req, b.p, b.size, off, size);
free(b.p);
}
}
static void hello_ll_open(fuse_req_t req, fuse_ino_t ino,
struct fuse_file_info *fi)
{
//change1
//if (ino != 2)
if ( (ino !=2) && (ino != 5) )
//end
fuse_reply_err(req, EISDIR);
else if ((fi->flags & 3) != O_RDONLY)
fuse_reply_err(req, EACCES);
else
fuse_reply_open(req, fi);
}
static void hello_ll_read(fuse_req_t req, fuse_ino_t ino, size_t size,
off_t off, struct fuse_file_info *fi)
{
(void) fi;
//change1
//assert(ino == 2);
//reply_buf_limited(req, hello_str, strlen(hello_str), off, size);
switch (ino) {
case 2:
reply_buf_limited(req, hello_str, strlen(hello_str), off, size);
break;
case 5:
reply_buf_limited(req, inode5_str, strlen(inode5_str), off, size);
break;
default:
;
}
//end
}
static struct fuse_lowlevel_ops hello_ll_oper = {
.lookup = hello_ll_lookup,
.getattr = hello_ll_getattr,
.readdir = hello_ll_readdir,
.open = hello_ll_open,
.read = hello_ll_read,
};
int main(int argc, char *argv[])
{
struct fuse_args args = FUSE_ARGS_INIT(argc, argv);
struct fuse_session *se;
struct fuse_cmdline_opts opts;
int ret = -1;
if (fuse_parse_cmdline(&args, &opts) != 0)
return 1;
if (opts.show_help) {
printf("usage: %s [options] <mountpoint>\n\n", argv[0]);
fuse_cmdline_help();
fuse_lowlevel_help();
ret = 0;
goto err_out1;
} else if (opts.show_version) {
printf("FUSE library version %s\n", fuse_pkgversion());
fuse_lowlevel_version();
ret = 0;
goto err_out1;
}
se = fuse_session_new(&args, &hello_ll_oper,
sizeof(hello_ll_oper), NULL);
if (se == NULL)
goto err_out1;
if (fuse_set_signal_handlers(se) != 0)
goto err_out2;
if (fuse_session_mount(se, opts.mountpoint) != 0)
goto err_out3;
fuse_daemonize(opts.foreground);
/* Block until ctrl+c or fusermount -u */
if (opts.singlethread)
ret = fuse_session_loop(se);
else
ret = fuse_session_loop_mt(se, opts.clone_fd);
fuse_session_unmount(se);
err_out3:
fuse_remove_signal_handlers(se);
err_out2:
fuse_session_destroy(se);
err_out1:
free(opts.mountpoint);
fuse_opt_free_args(&args);
return ret ? 1 : 0;
}结果测试：
cd ~/fuse-3.0.0rc3/example/ make ./hello_ll /mnt ll -i /mnt cat /mnt/frombyte umount /mnt
2、待续
本文出自 “张宇(数据恢复)” 博客，请务必保留此出处http://zhangyu.blog.51cto.com/197148/1881032
操作记录：在ubuntu16.04.1配置fuse开发环境及fuse开发规范测试
原文地址：http://zhangyu.blog.51cto.com/197148/1881032
