Linux 访问fat格式文件系统

首先要导入这些头文件
#include
#include
#include
#include
#include
#include



然后看一下实际的操作


1、查看文件系统信息
asmlinkage long get_files_info(char * filesystem_type)//取得当前目录的文件系统信息
{
struct fs_struct *fs ;
struct vfsmount *mnt ;
struct super_block *mnt_sb ;
struct file_system_type *s_type;
read_lock(¤t->fs->lock);
fs = current->fs;
mnt = fs->pwdmnt;
mnt_sb = mnt-> mnt_sb ;
s_type = mnt_sb -> s_type;

printk("PWD Filesystem Type is : %s\n",s_type->name);
copy_to_user(filesystem_type,s_type->name,strlen(s_type->name));

printk("PWD= %ld\n",mnt_sb->s_blocksize);

read_unlock(¤t->fs->lock);
return 0;
}







2、查看fat_boot_sector 信息
asmlinkage long get_FAT_boot(char * filesystem_type)//取得fat文件系统的信息
{
struct fs_struct *fs ;
struct vfsmount *mnt ;
struct super_block *mnt_sb ;
struct buffer_head * bh=NULL;
struct fat_boot_sector *fat_sector;
char c[512];
int len;

read_lock(¤t->fs->lock);
fs = current->fs;
mnt = fs->pwdmnt;
mnt_sb = mnt-> mnt_sb ;
char *fsname=mnt_sb -> s_type->name;
char *sfs="vfat";
if(strcmp(fsname,sfs)==0)//此时文件系统是vfat
{
sb_min_blocksize(mnt_sb, 512);
bh = sb_bread(mnt_sb, 0);
if(bh!=NULL)
{
fat_sector=(struct fat_boot_sector *)bh->b_data;
len=sprintf(c,"FAT文件系统具体参数如下:\n");
len=sprintf(c,"%sbackup boot sector= %d\n",c,fat_sector->backup_boot);
len=sprintf(c,"%ssectors/cluster= %d\n",c,fat_sector->sec_per_clus);
len=sprintf(c,"%snumber of heads= %d\n",c,fat_sector->heads);
len=sprintf(c,"%shidden sectors (unused)= %d\n",c,fat_sector->hidden);
len=sprintf(c,"%smedia code= %d\n",c,fat_sector->media);
len=sprintf(c,"%sbytes per logic