On Wed, 13 Dec 2006 20:19:51 +0100 (MET)
Jan Engelhardt <[email protected]> wrote:
>
> >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.
>
> For hard disks:
> file->f_dentry->d_inode->d_sb->s_bdev gives you the block device
> in case it is a non-virtual filesystem.
>
> For pipes/sockets I do not know of a may to go from a filp to a
> struct sock or struct socket.
>
> >If it is a socket we are interested
> >from which device (eth0, eth1, lo, ...) the data was received.
>
> I do not think that is possible either.
The connection between file and network device is through many
layers and there is no direct binding. It could be 0 to N interfaces
and even be data dependent.
--
Stephen Hemminger <[email protected]>
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