linux-kernel - Re: [PATCH v6 02/16] chardev: introduce cdev_get_by

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Message-ID: <20190725190024.GD30641@bombadil.infradead.org>
Date:   Thu, 25 Jul 2019 12:00:24 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Logan Gunthorpe <logang@...tatee.com>,
        linux-kernel@...r.kernel.org, linux-nvme@...ts.infradead.org,
        linux-block@...r.kernel.org, linux-fsdevel@...r.kernel.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>,
        Alexander Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH v6 02/16] chardev: introduce cdev_get_by_path()

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.