linux-kernel - Re: How to locate struct file * from a bio?

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Message-ID: <d66e87630701311055h49a03552m904cbf00751dd805@mail.gmail.com>
Date:	Wed, 31 Jan 2007 13:55:15 -0500
From:	"Eddie Pettis" <pettis.eddie@...il.com>
To:	"Helge Hafting" <helge.hafting@...el.hist.no>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: How to locate struct file * from a bio?

On 1/31/07, Helge Hafting <helge.hafting@...el.hist.no> wrote:
> Eddie Pettis wrote:
> > Short question:  Is it possible to locate the struct file * associated
> > with a bio?  If so, how?
> >
>
> Looks like you do this the wrong way.

Agreed.  It was a bad hack based on something I had done previously.

>
> Why don't you tap into "open" instead?
> Here you can note who opens the file and if they open it for
> reading or writing.  If you really need the amount of data
> transferred, consider trapping the read and write syscalls too.

I added hooks to the sys_* system calls for read/write/open/close from
userspace, and that seems to work.

Thanks!

>
> Helge Hafting
>
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