Writing to a file from kernel

["Amit Kapoor" <amit_kapoor16@hotmail.com>]

Hi,

  I am having a weird problem writing to a file from the kernel.  At the 
statement ' file->f_op->write(...)' the module just seems to hang during 
insmod.  Could anyone tell me why this might be the case?  The code is 
pasted below.

Thanks,
-Amit

PS - My earlier mail didn't go completely through.  Sorry about that.

-----------------------------------------------------------------------------------

int init_module()
{
        struct file *file = NULL;
        struct inode *inode;
        mm_segment_t fs;
        char *str = "foo";

       
/* the file test.log was 'touched' before insmod-ing' */
        file = filp_open("/tmp/test.log", O_WRONLY|O_APPEND,0);

        if (IS_ERR(file)||(file==NULL)) {
                printk("Error in opening file \n");
        }

        if (!file->f_op->write) {
                fput(file);
        }

        fs = get_fs();
        inode = file->f_dentry->d_inode;
        down(&inode->i_sem);

        set_fs(KERNEL_DS);
        /* this line seems to hang */
        file->f_op->write(file, str, 3, &file->f_pos);
        set_fs(fs);

        up(&inode->i_sem);
        return 0;
}


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