problem in reading a file in kernel space

[santosh pattar <santoshkumar_pattar@xxxxxxxxx>]

Hi,

 

I am getting a problem when reading a file in kernel space. can any one help me with this.

 

 

 

#include <linux/module.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/syscalls.h>

MODULE_LICENSE("GPL");

static char buff[100];
int init_module(void)
{
 struct file *filp;
 int unused_fd, nbr;
 printk("loading hello\n");
 filp = filp_open("a.txt",O_RDWR,0);    // a.txt is a file which i need to read
 unused_fd = get_unused_fd();
 printk("unused_fd = %d\n", unused_fd);
 fd_install(unused_fd, filp);
 nbr = sys_read(unused_fd, buff, 100);    // problem is here. nbr returning error.
 printk("nbr= %d", nbr);
 printk( "%s", buff);
 return 0;
}

void cleanup_module(void)
{
 printk("Unloading hello\n");
}

 

thanks

santosh

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