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From: Miklos Szeredi <miklos@szeredi.hu>
To: Alessio Balsini <balsini@android.com>
Cc: Akilesh Kailash <akailash@google.com>,
	Amir Goldstein <amir73il@gmail.com>,
	Antonio SJ Musumeci <trapexit@spawn.link>,
	David Anderson <dvander@google.com>,
	Giuseppe Scrivano <gscrivan@redhat.com>,
	Jann Horn <jannh@google.com>, Jens Axboe <axboe@kernel.dk>,
	Martijn Coenen <maco@android.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Paul Lawrence <paullawrence@google.com>,
	Stefano Duo <stefanoduo@google.com>,
	Zimuzo Ezeozue <zezeozue@google.com>,
	fuse-devel <fuse-devel@lists.sourceforge.net>,
	kernel-team <kernel-team@android.com>,
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH V9 1/4] fuse: Definitions and ioctl() for passthrough
Date: Wed, 30 Sep 2020 17:44:54 +0200
Message-ID: <CAJfpegvB7XJH7sPni7Vj7R4ZwSrDfevfeRRBgvESSgGg=C5tdQ@mail.gmail.com> (raw)
In-Reply-To: <20200924131318.2654747-2-balsini@android.com>

On Thu, Sep 24, 2020 at 3:13 PM Alessio Balsini <balsini@android.com> wrote:
>
> Introduce the new FUSE passthrough ioctl(), which allows userspace to
> specify a direct connection between a FUSE file and a lower file system
> file.
> Such ioctl() requires userspace to specify:
> - the file descriptor of one of its opened files,
> - the unique identifier of the FUSE request associated with a pending
>   open/create operation,
> both encapsulated into a fuse_passthrough_out data structure.
> The ioctl() will search for the pending FUSE request matching the unique
> identifier, and update the passthrough file pointer of the request with the
> file pointer referenced by the passed file descriptor.
> When that pending FUSE request is handled, the passthrough file pointer
> is copied to the fuse_file data structure, so that the link between FUSE
> and lower file system is consolidated.

How about returning an ID from the ioctl (like the fuse2 porototype)
and returning that in fuse_open_out.passthrough_fh?

Seems a more straightforward interface to me.

Thanks,
Miklos

  parent reply index

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-24 13:13 [PATCH V9 0/4] fuse: Add support for passthrough read/write Alessio Balsini
2020-09-24 13:13 ` [PATCH V9 1/4] fuse: Definitions and ioctl() for passthrough Alessio Balsini
2020-09-29 14:37   ` Alessio Balsini
2020-09-30 15:44   ` Miklos Szeredi [this message]
2020-10-22 16:12     ` Alessio Balsini
2020-09-24 13:13 ` [PATCH V9 2/4] fuse: Trace daemon creds Alessio Balsini
2020-09-30 18:45   ` Miklos Szeredi
2020-09-30 19:16     ` Antonio SJ Musumeci
2020-10-22 16:14       ` Alessio Balsini
2020-09-24 13:13 ` [PATCH V9 3/4] fuse: Introduce synchronous read and write for passthrough Alessio Balsini
2020-09-30 18:50   ` Miklos Szeredi
2020-10-22 16:17     ` Alessio Balsini
2020-09-24 13:13 ` [PATCH V9 4/4] fuse: Handle asynchronous read and write in passthrough Alessio Balsini
2020-09-30 18:54   ` Miklos Szeredi
2020-10-22 16:38     ` Alessio Balsini
2020-09-30 15:33 ` [PATCH V9 0/4] fuse: Add support for passthrough read/write Miklos Szeredi
2020-10-02 13:38   ` Alessio Balsini
2020-10-21 15:39     ` Alessio Balsini

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