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Date:   Thu, 25 Jul 2019 12:00:24 -0700
From:   Matthew Wilcox <willy@infradead.org>
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc:     Logan Gunthorpe <logang@deltatee.com>,
        linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org,
        linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org,
        Christoph Hellwig <hch@lst.de>,
        Sagi Grimberg <sagi@grimberg.me>,
        Keith Busch <kbusch@kernel.org>, Jens Axboe <axboe@fb.com>,
        Chaitanya Kulkarni <Chaitanya.Kulkarni@wdc.com>,
        Max Gurtovoy <maxg@mellanox.com>,
        Stephen Bates <sbates@raithlin.com>,
        Alexander Viro <viro@zeniv.linux.org.uk>
Subject: Re: [PATCH v6 02/16] chardev: introduce cdev_get_by_path()
Message-ID: <20190725190024.GD30641@bombadil.infradead.org>
References: <20190725172335.6825-1-logang@deltatee.com>
 <20190725172335.6825-3-logang@deltatee.com>
 <20190725174032.GA27818@kroah.com>
 <682ff89f-04e0-7a94-5aeb-895ac65ee7c9@deltatee.com>
 <20190725180816.GA32305@kroah.com>
 <da0eacb7-3738-ddf3-8c61-7ffc61aa41f4@deltatee.com>
 <20190725182701.GA11547@kroah.com>
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On Thu, Jul 25, 2019 at 08:27:01PM +0200, Greg Kroah-Hartman wrote:
> > NVMe-OF is configured using configfs. The target is specified by the
> > user writing a path to a configfs attribute. This is the way it works
> > today but with blkdev_get_by_path()[1]. For the passthru code, we need
> > to get a nvme_ctrl instead of a block_device, but the principal is the same.
> 
> Why isn't a fd being passed in there instead of a random string?

I suppose we could echo a string of the file descriptor number there,
and look up the fd in the process' file descriptor table ...

I'll get my coat.