From: "Darrick J. Wong" <djwong@kernel.org>
To: Miklos Szeredi <miklos@szeredi.hu>
Cc: John Groves <John@groves.net>,
Dan Williams <dan.j.williams@intel.com>,
Bernd Schubert <bschubert@ddn.com>,
John Groves <jgroves@micron.com>,
Jonathan Corbet <corbet@lwn.net>,
Vishal Verma <vishal.l.verma@intel.com>,
Dave Jiang <dave.jiang@intel.com>,
Matthew Wilcox <willy@infradead.org>, Jan Kara <jack@suse.cz>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Christian Brauner <brauner@kernel.org>,
Randy Dunlap <rdunlap@infradead.org>,
Jeff Layton <jlayton@kernel.org>,
Kent Overstreet <kent.overstreet@linux.dev>,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
nvdimm@lists.linux.dev, linux-cxl@vger.kernel.org,
linux-fsdevel@vger.kernel.org,
Amir Goldstein <amir73il@gmail.com>,
Jonathan Cameron <Jonathan.Cameron@huawei.com>,
Stefan Hajnoczi <shajnocz@redhat.com>,
Joanne Koong <joannelkoong@gmail.com>,
Josef Bacik <josef@toxicpanda.com>,
Aravind Ramesh <arramesh@micron.com>,
Ajay Joshi <ajayjoshi@micron.com>
Subject: Re: [RFC V2 14/18] famfs_fuse: GET_DAXDEV message and daxdev_table
Date: Thu, 14 Aug 2025 10:19:41 -0700 [thread overview]
Message-ID: <20250814171941.GU7942@frogsfrogsfrogs> (raw)
In-Reply-To: <CAJfpegv19wFrT0QFkwFrKbc6KXmktt0Ba2Lq9fZoihA=eb8muA@mail.gmail.com>
On Thu, Aug 14, 2025 at 03:58:58PM +0200, Miklos Szeredi wrote:
> On Thu, 3 Jul 2025 at 20:54, John Groves <John@groves.net> wrote:
> >
> > * The new GET_DAXDEV message/response is enabled
> > * The command it triggered by the update_daxdev_table() call, if there
> > are any daxdevs in the subject fmap that are not represented in the
> > daxdev_dable yet.
>
> This is rather convoluted, the server *should know* which dax devices
> it has registered, hence it shouldn't need to be explicitly asked.
>
> And there's already an API for registering file descriptors:
> FUSE_DEV_IOC_BACKING_OPEN. Is there a reason that interface couldn't
> be used by famfs?
What happens if you want to have a fuse server that hosts both famfs
files /and/ backing files? That'd be pretty crazy to mix both paths in
one filesystem, but it's in theory possible, particularly if the famfs
server wanted to export a pseudofile where everyone could find that
shadow file?
--D
> Thanks,
> Miklos
>
next prev parent reply other threads:[~2025-08-14 17:19 UTC|newest]
Thread overview: 91+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-07-03 18:50 [RFC V2 00/18] famfs: port into fuse John Groves
2025-07-03 18:50 ` [RFC V2 01/18] dev_dax_iomap: Move dax_pgoff_to_phys() from device.c to bus.c John Groves
2025-07-03 18:50 ` [RFC V2 02/18] dev_dax_iomap: Add fs_dax_get() func to prepare dax for fs-dax usage John Groves
2025-07-04 10:39 ` Jonathan Cameron
2025-07-04 12:54 ` John Groves
2025-07-03 18:50 ` [RFC V2 03/18] dev_dax_iomap: Save the kva from memremap John Groves
2025-07-04 11:11 ` Jonathan Cameron
2025-07-03 18:50 ` [RFC V2 04/18] dev_dax_iomap: Add dax_operations for use by fs-dax on devdax John Groves
2025-07-04 12:47 ` Jonathan Cameron
2025-07-05 22:56 ` John Groves
2025-07-03 18:50 ` [RFC V2 05/18] dev_dax_iomap: export dax_dev_get() John Groves
2025-07-03 18:50 ` [RFC V2 06/18] dev_dax_iomap: (ignore!) Drop poisoned page warning in fs/dax.c John Groves
2025-07-03 18:50 ` [RFC V2 07/18] famfs_fuse: magic.h: Add famfs magic numbers John Groves
2025-07-03 18:50 ` [RFC V2 08/18] famfs_fuse: Kconfig John Groves
2025-07-03 18:50 ` [RFC V2 09/18] famfs_fuse: Update macro s/FUSE_IS_DAX/FUSE_IS_VIRTIO_DAX/ John Groves
2025-07-04 8:44 ` Amir Goldstein
2025-07-03 18:50 ` [RFC V2 10/18] famfs_fuse: Basic fuse kernel ABI enablement for famfs John Groves
2025-07-03 22:45 ` John Groves
2025-07-07 17:32 ` Darrick J. Wong
2025-07-04 7:54 ` Amir Goldstein
2025-07-04 13:39 ` John Groves
2025-07-07 17:39 ` Darrick J. Wong
2025-07-08 12:02 ` John Groves
2025-07-09 1:53 ` Darrick J. Wong
2025-07-11 1:32 ` John Groves
2025-07-12 4:49 ` Darrick J. Wong
2025-08-11 18:30 ` John Groves
2025-08-12 16:37 ` Darrick J. Wong
2025-08-13 13:07 ` John Groves
2025-08-14 17:16 ` Darrick J. Wong
2025-07-03 18:50 ` [RFC V2 11/18] famfs_fuse: Basic famfs mount opts John Groves
2025-07-09 3:59 ` Darrick J. Wong
2025-07-11 15:28 ` John Groves
2025-07-12 5:54 ` Darrick J. Wong
2025-08-14 10:37 ` Miklos Szeredi
2025-08-14 14:39 ` John Groves
2025-08-14 15:19 ` Miklos Szeredi
2025-08-14 23:52 ` John Groves
2025-07-03 18:50 ` [RFC V2 12/18] famfs_fuse: Plumb the GET_FMAP message/response John Groves
2025-07-04 8:54 ` Amir Goldstein
2025-07-04 20:30 ` John Groves
2025-07-05 0:06 ` John Groves
2025-07-05 7:58 ` Amir Goldstein
2025-07-05 19:17 ` John Groves
2025-07-09 4:27 ` Darrick J. Wong
2025-07-11 13:46 ` John Groves
2025-08-14 13:36 ` Miklos Szeredi
2025-08-14 14:36 ` Miklos Szeredi
2025-08-14 18:20 ` Darrick J. Wong
2025-08-15 15:06 ` John Groves
2025-08-19 21:55 ` Darrick J. Wong
2025-08-15 16:53 ` John Groves
2025-08-19 22:13 ` Darrick J. Wong
2025-08-14 18:05 ` Darrick J. Wong
2025-08-16 15:00 ` John Groves
2025-08-19 22:17 ` Darrick J. Wong
2025-08-15 0:38 ` John Groves
2025-07-03 18:50 ` [RFC V2 13/18] famfs_fuse: Create files with famfs fmaps John Groves
2025-07-04 9:01 ` Amir Goldstein
2025-07-05 19:27 ` John Groves
2025-07-03 18:50 ` [RFC V2 14/18] famfs_fuse: GET_DAXDEV message and daxdev_table John Groves
2025-07-04 13:20 ` Jonathan Cameron
2025-07-06 17:07 ` John Groves
2025-08-14 13:58 ` Miklos Szeredi
2025-08-14 17:19 ` Darrick J. Wong [this message]
2025-08-14 18:25 ` Miklos Szeredi
2025-08-14 18:55 ` Darrick J. Wong
2025-08-14 19:19 ` Miklos Szeredi
2025-08-16 16:22 ` John Groves
2025-08-19 22:32 ` Darrick J. Wong
2025-08-15 16:38 ` John Groves
2025-08-19 22:34 ` Darrick J. Wong
2025-07-03 18:50 ` [RFC V2 15/18] famfs_fuse: Plumb dax iomap and fuse read/write/mmap John Groves
2025-07-04 9:13 ` Amir Goldstein
2025-07-05 19:44 ` John Groves
2025-07-03 18:50 ` [RFC V2 16/18] famfs_fuse: Add holder_operations for dax notify_failure() John Groves
2025-07-03 18:50 ` [RFC V2 17/18] famfs_fuse: Add famfs metadata documentation John Groves
2025-07-03 18:50 ` [RFC V2 18/18] famfs_fuse: Add documentation John Groves
2025-07-04 0:27 ` Bagas Sanjaya
2025-07-04 2:22 ` Jonathan Corbet
2025-07-04 3:53 ` Bagas Sanjaya
2025-07-04 18:58 ` Matthew Wilcox
2025-07-04 23:29 ` Bagas Sanjaya
2025-07-04 23:43 ` Matthew Wilcox
2025-07-05 1:11 ` Bagas Sanjaya
2025-07-04 6:09 ` Randy Dunlap
2025-07-04 8:27 ` Amir Goldstein
2025-07-04 23:36 ` Bagas Sanjaya
2025-07-03 18:56 ` [RFC V2 00/18] famfs: port into fuse John Groves
2025-07-09 3:26 ` Miklos Szeredi
2025-07-11 1:18 ` John Groves
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