linux-kernel - Re: [GIT PULL] SCSI fixes for 4.18-rc3

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Date:   Tue, 10 Jul 2018 23:45:42 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Tony Battersby <tonyb@...ernetics.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        James Bottomley <James.Bottomley@...senpartnership.com>,
        Jann Horn <jannh@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux SCSI List <linux-scsi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [GIT PULL] SCSI fixes for 4.18-rc3

On Tue, Jul 10, 2018 at 05:53:18PM -0400, Tony Battersby wrote:
> At my job (https://www.cybernetics.com/), I use the write()/read()
> interface to the SCSI generic driver for access to tape drives and tape
> medium changers.  For example, the write()/read() interface is useful
> for implementing RAID-like functionality for tape drives since a single
> thread can send commands to multiple tape drives at once and poll() for
> command completion.  We have a lot of code invested in this interface,
> so it would be a huge pain for us if it were removed.  But in our case,
> everything runs as root (as the firmware of an embedded storage
> appliance), so extra permission checks should be OK.

Do you just use read/write on /dev/sg or also on /dev/bsg?  Because
I started a discussion to kill the read/write support for the latter
even before Linus brought it up here..  (and we have the same fix
pending for /dev/bsg)