linux-kernel - Re: get device from file struct

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Date:	Wed, 13 Dec 2006 20:19:51 +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


>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.


	-`J'
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