linux-kernel - Re: get device from file struct

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Date:	Wed, 13 Dec 2006 12:03:18 +0100 (MET)
From:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
To:	Silviu Craciunas <silviu.craciunas@....ac.at>
cc:	linux-kernel@...r.kernel.org
Subject: Re: get device from file struct


>> >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'
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