linux-kernel - Re: Can we pass a file handle down to the block ioctls to implement per file filters on scsi SG

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Date:	Tue, 12 Jun 2012 21:13:54 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	linux-kernel@...r.kernel.org, axboe@...nel.dk,
	linux-scsi@...r.kernel.org, jbottomley@...allels.com,
	Al Viro <viro@...IV.linux.org.uk>
Subject: Re: Can we pass a file handle down to the block ioctls to implement
 per file filters on scsi SG_IO ?

Il 12/06/2012 20:52, Alan Cox ha scritto:
> > Sure; however, doing so requires access to some member of "struct file"
> > from SG_IO.  Thus, ioctl would need to take a "struct file" rather than
> > just an fmode_t.
> > 
> > The switch to fmode_t was done in 2007 by Al Viro.  I would like to
> > understand the reasons for the switch; it seems to me that it was part
> > of the big kernel lock removal.  If it's acceptable to undo it, I would
> > very much would like to add generic BPF filtering to SG_IO
> 
> That would solve all sorts of problems in this area, so lets ping the man
> himself -  Al ?

(Even if he says no, we could probably use cgroups instead).

Paolo
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