mount.myfs.c

一个LINUX下一个框架文件系统,运行编译环境：RED HAT LINUX7.3

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <netdb.h>
#include <unistd.h>

#include <sys/socket.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <mntent.h>

struct fs_mount_data {
	uint32_t info_magic;
	uint32_t flags;
	uint16_t port;
	char mgr[100];
	char dir[PATH_MAX];
};

/* sematics for mmount
#mmount
required arguments: 1 destination host
					2 destination directory
					3 local mount point
*/

int main(int argc, char **argv)
/*	Fill the mount arguments myself! */
{
	int ret, flags = 0;
	char type[] = "myfs";
	struct fs_mount_data data;
	char special[PATH_MAX+1];
	char mnt_point[PATH_MAX+1];
	struct stat mntpt;

	strcpy( special, "10.0.0.2:/myfs-meta" );
	strcpy( mnt_point, "/mnt/myfs" );
	//desthost:destmeta -- used to specify the device name
	//special is actually not used.

	data.info_magic = 0;
	data.flags   = 0;
	data.port    = 6000;
	strcpy(data.mgr, "10.0.0.2");
	strcpy(data.dir, "/myfs-meta");
	//data struct will be transferred to myfs_read_super

	flags |= 0xC0ED0000;

	/* verify that local mountpoint exists and is a directory */
	if (stat( data.dir, &mntpt) < 0 || !S_ISDIR(mntpt.st_mode)) {
		fprintf(stderr, "mount.myfs: invalid mount point %s (should be a local directory)\n", data.dir);
		return 1;
	}

//	printf("calling mount(special = %s, mountpoint = %s, type = %s,"
//			  " flags = %x, data = %lx)\n", special, data.dir, type, flags, (unsigned long) &data);

	if ((ret = mount(special, mnt_point, type, flags, (void *) &data)) < 0){
		printf("Error mount.myfs!\n");
		printf(stderr, "mount.myfs: server %s alive, but mount failed (invalid metadata directory name?)\n",
				  data.mgr);
		return (ret);
	}

	return(ret);
} /* end of main() */