linux-kernel - Re: [PATCH 0/3] SG_IO command filtering via sysfs

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Date:   Fri, 16 Nov 2018 08:01:29 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Bart Van Assche <bvanassche@....org>,
        "Theodore Y. Ts'o" <tytso@....edu>, linux-kernel@...r.kernel.org,
        linux-scsi@...r.kernel.org, Hannes Reinecke <hare@...e.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        James Bottomley <James.Bottomley@...senpartnership.com>,
        Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH 0/3] SG_IO command filtering via sysfs

On 16/11/18 01:37, Bart Van Assche wrote:
> All user space interfaces in the Linux kernel for storage that I'm familiar
> with not only allow configuration of parameters but also make it easy to
> query which parameters have been configured. The existing sysfs and configfs
> interfaces demonstrate this. Using BPF to configure SG/IO access has a
> significant disadvantage, namely that it is very hard to figure out what has
> been configured. Figuring out what has been configured namely requires
> disassembling BPF. I'm not sure anyone will be enthusiast about this.

Well, that's a problem with BPF in general.  With great power comes
great obscurability.

Paolo