linux-kernel - Re: [PATCH v15 5/9] nvme-core: Introduce nvme_ctrl_get_by

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Message-ID: <20200720140908.GE4627@lst.de>
Date:   Mon, 20 Jul 2020 16:09:08 +0200
From:   Christoph Hellwig <hch@....de>
To:     Logan Gunthorpe <logang@...tatee.com>
Cc:     linux-kernel@...r.kernel.org, linux-nvme@...ts.infradead.org,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>,
        Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...com>,
        Chaitanya Kulkarni <Chaitanya.Kulkarni@....com>,
        Max Gurtovoy <maxg@...lanox.com>,
        Stephen Bates <sbates@...thlin.com>
Subject: Re: [PATCH v15 5/9] nvme-core: Introduce nvme_ctrl_get_by_path()

On Thu, Jul 16, 2020 at 02:33:15PM -0600, Logan Gunthorpe wrote:
> nvme_ctrl_get_by_path() is analagous to blkdev_get_by_path() except it
> gets a struct nvme_ctrl from the path to its char dev (/dev/nvme0).
> It makes use of filp_open() to open the file and uses the private
> data to obtain a pointer to the struct nvme_ctrl. If the fops of the
> file do not match, -EINVAL is returned.
> 
> The purpose of this function is to support NVMe-OF target passthru.

This looks generally good.  However since the early days of this
patchset we've grown symbol namespaces, and the EXPORT_SYMBOL_NS_GPL
macro, which are what we really should use here and for the other
exports.