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Date: Wed, 12 Sep 2012 00:10:19 +0200 From: Paolo Bonzini <pbonzini@...hat.com> To: Tejun Heo <tj@...nel.org> CC: linux-kernel@...r.kernel.org, axboe@...nel.dk, linux-scsi@...r.kernel.org, "James E.J. Bottomley" <JBottomley@...allels.com>, Kay Sievers <kay.sievers@...y.org>, Al Viro <viro@...iv.linux.org.uk> Subject: Re: [PATCH] sg_io: allow UNMAP and WRITE SAME without CAP_SYS_RAWIO Il 12/09/2012 00:02, Tejun Heo ha scritto: > SG_IO itself is a bypassing interface. It bypasses most of block > layer and the kernel doesn't have any idea (apart from the adhoc > filtering) about what's going on. That's very much the point. The guest must have free reins. You asked "Could being able to bypass the filters for this "you own this LUN" be a solution?", I said yes and outlined how. Do you agree with the proposed solution? > The problem can be approached from > both directions (make use of OS IO layer improving it as needed or add > more intelligence to the bypass thing) Or remove intelligence if it gets in the way. Of course the removal must be done by an appropriately-privileged program. > and I'm not sure at all adding > more capability to the adhoc filtering is the better direction. Sure, I'm fine with leaving the current ad hoc filtering aside. Again, I was hoping to get most of the job done by loosening the filter a bit, but discussion is inversely proportional to patch length sometimes. Paolo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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