This will never work, as you call blocking (non-atomic) functions from
atomic context.
kernel coder wrote:
> hi,
> I'm trying to dump some information from dev.c to user space
> file.Following is the code which i'm using to write to user spcae
> file.I'm using 2.6.22.x86_64 kernel.
>
>
> #define _write(f, buf, sz) (f->f_op->write(f, buf, sz, &f->f_pos))
> #define WRITABLE(f) (f->f_op && f->f_op->write)
>
> int write_to_file(char *logfile, char *buf,int size)
> {
> int ret = 0;
> struct file *f=NULL;
> mm_segment_t old_fs = get_fs();
> set_fs(get_ds());
> f = filp_open(logfile, O_CREAT|O_APPEND,00600);
> if(IS_ERR(f)){
> DPRINT("Error %ld openeing %s\n",-PTR_ERR(f), logfile);
> ret = -1;
> } else {
> if (WRITABLE(f))
> _write(f, buf, size);
> else {
> DPRINT("%s does not have a write method\n",
> logfile);
> ret = -1;
> }
>
> if ((ret = filp_close(f,NULL)))
> DPRINT("Error %d closing %s\n", -ret, logfile);
> }
> END_KMEM;
>
> return ret;
> }
>
>
> I'm calling this function from netif_recieve_skb in dev.c
>
> int netif_recieve_skb(struct sk_buff *skb){
>
> ---------------------
> write_to_file("/root/kernel_log","hello_world",12);
> ----------------------
>
> }
>
> But whenever this function is called ,the kernel simply halts.Please
> tell me what might be the reason.
>
> I just want to dump some information to user spcace file from dev.c
> .Is there some better way to do it.
use something like ipt_LOG or packet sockets
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