linux-kernel - Re: [RFC PATCH] nvme: allow NVME_IOCTL_IO_CMD on controller char dev even when multiple ns

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Date:   Fri, 2 Apr 2021 19:16:48 +0200
From:   Christoph Hellwig <hch@....de>
To:     Niklas Cassel <Niklas.Cassel@....com>
Cc:     Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...com>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>,
        "minwoo.im.dev@...il.com" <minwoo.im.dev@...il.com>,
        "javier@...igon.com" <javier@...igon.com>,
        "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH] nvme: allow NVME_IOCTL_IO_CMD on controller char
 dev even when multiple ns

Well, there is at least one good reason for not allowing this
retroactively:

Old users of the ioctl could have complete garbage in the field, and
might send the command to a random namespace now instead of the first
one.

So unles we have a very good reason I think we should keep
NVME_IOCTL_IO_CMD on the controller char dev deprecated and maybe
eventually remove it.