On Wed, 2006-12-13 at 12:03 +0100, Jan Engelhardt wrote:
> >> >thanks for the reply, the block device can be determined with the major
> >> >and minor numbers , what I would be more interested in is if one can get
> >> >the net_device struct from the file struct
> >>
> >> Just how are you supposed to match files and network devices?
> >>
> >
> >from the struct file you can get the struct socket and from there to the
> >struct sock .
>
> That only applies when using PF_LOCAL sockets.
>
> >What I would like to find out is where the data is coming
> >from (read) and where it is going to(write) or if it is even possible to
> >find the net device out using the struct file.
>
> I really don't get what you want.
>
> Suppose a daemon reads from a socket (PF_INET), then there is a file descriptor
> to sockfs (look into /proc/$$/fd/). Well, then you may be able to get the
> struct file for that socket, but it does not connect to a regular file
> (S_IFREG) at all.
>
>
> -`J'
in fs/read_write.c, the vfs_read function does:
file->f_op->read(file, buf, count, pos);
after this call is it possible to determine where the
data is coming from? e.g., the first hard disk, a pipe
or from a socket. If it is a socket we are interested
from which device (eth0, eth1, lo, ...) the data was received.
silviu
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