From: Sarthak Kukreti <sarthakkukreti@chromium.org>
To: Mike Snitzer <snitzer@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>,
Christoph Hellwig <hch@infradead.org>,
Joe Thornber <thornber@redhat.com>,
"Michael S. Tsirkin" <mst@redhat.com>,
"Darrick J. Wong" <djwong@kernel.org>,
Jason Wang <jasowang@redhat.com>,
Bart Van Assche <bvanassche@google.com>,
Dave Chinner <david@fromorbit.com>,
linux-kernel@vger.kernel.org, Joe Thornber <ejt@redhat.com>,
linux-block@vger.kernel.org, dm-devel@redhat.com,
Andreas Dilger <adilger.kernel@dilger.ca>,
Stefan Hajnoczi <stefanha@redhat.com>,
linux-fsdevel@vger.kernel.org, "Theodore Ts'o" <tytso@mit.edu>,
linux-ext4@vger.kernel.org, Brian Foster <bfoster@redhat.com>,
Alasdair Kergon <agk@redhat.com>
Subject: Re: [PATCH v7 0/5] Introduce provisioning primitives
Date: Fri, 6 Oct 2023 18:30:22 -0700 [thread overview]
Message-ID: <CAG9=OMPqGmX75ZmK=Fc7DNE7dcxS+t-UPkjtCVDF+dPN+xkrNg@mail.gmail.com> (raw)
In-Reply-To: <ZIOMLfMjugGf4C2T@redhat.com>
On Fri, Jun 9, 2023 at 1:31 PM Mike Snitzer <snitzer@redhat.com> wrote:
>
> On Wed, Jun 07 2023 at 7:27P -0400,
> Mike Snitzer <snitzer@kernel.org> wrote:
>
> > On Mon, Jun 05 2023 at 5:14P -0400,
> > Sarthak Kukreti <sarthakkukreti@chromium.org> wrote:
> >
> > > On Sat, Jun 3, 2023 at 8:57 AM Mike Snitzer <snitzer@kernel.org> wrote:
> > > >
> > > > We all just need to focus on your proposal and Joe's dm-thin
> > > > reservation design...
> > > >
> > > > [Sarthak: FYI, this implies that it doesn't really make sense to add
> > > > dm-thinp support before Joe's design is implemented. Otherwise we'll
> > > > have 2 different responses to REQ_OP_PROVISION. The one that is
> > > > captured in your patchset isn't adequate to properly handle ensuring
> > > > upper layer (like XFS) can depend on the space being available across
> > > > snapshot boundaries.]
> > > >
> > > Ack. Would it be premature for the rest of the series to go through
> > > (REQ_OP_PROVISION + support for loop and non-dm-thinp device-mapper
> > > targets)? I'd like to start using this as a reference to suggest
> > > additions to the virtio-spec for virtio-blk support and start looking
> > > at what an ext4 implementation would look like.
> >
> > Please drop the dm-thin.c and dm-snap.c changes. dm-snap.c would need
> > more work to provide the type of guarantee XFS requires across
> > snapshot boundaries. I'm inclined to _not_ add dm-snap.c support
> > because it is best to just use dm-thin.
> >
> > And FYI even your dm-thin patch will be the starting point for the
> > dm-thin support (we'll keep attribution to you for all the code in a
> > separate patch).
> >
> > > Fair points, I certainly don't want to derail this conversation; I'd
> > > be happy to see this work merged sooner rather than later.
> >
> > Once those dm target changes are dropped I think the rest of the
> > series is fine to go upstream now. Feel free to post a v8.
>
> FYI, I've made my latest code available in this
> 'dm-6.5-provision-support' branch (based on 'dm-6.5'):
> https://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm.git/log/?h=dm-6.5-provision-support
>
> It's what v8 should be plus the 2 dm-thin patches (that I don't think
> should go upstream yet, but are theoretically useful for Dave and
> Joe).
>
Cheers! Apologies for dropping the ball on this, I just sent out v8
with the dm-thin patches dropped.
- Sarthak
> The "dm thin: complete interface for REQ_OP_PROVISION support" commit
> establishes all the dm-thin interface I think is needed. The FIXME in
> process_provision_bio() (and the patch header) cautions against upper
> layers like XFS using this dm-thinp support quite yet.
>
> Otherwise we'll have the issue where dm-thinp's REQ_OP_PROVISION
> support initially doesn't provide the guarantee that XFS needs across
> snapshots (which is: snapshots inherit all previous REQ_OP_PROVISION).
>
> Mike
>
next prev parent reply other threads:[~2023-10-07 1:30 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-18 22:33 [PATCH v7 0/5] Introduce provisioning primitives Sarthak Kukreti
2023-05-18 22:33 ` [PATCH v7 1/5] block: Don't invalidate pagecache for invalid falloc modes Sarthak Kukreti
2023-05-19 4:09 ` Christoph Hellwig
2023-05-19 15:17 ` Darrick J. Wong
2023-05-18 22:33 ` [PATCH v7 2/5] block: Introduce provisioning primitives Sarthak Kukreti
2023-05-19 4:18 ` Christoph Hellwig
2023-06-09 20:00 ` Mike Snitzer
2023-05-18 22:33 ` [PATCH v7 3/5] dm: Add block provisioning support Sarthak Kukreti
2023-05-18 22:33 ` [PATCH v7 4/5] dm-thin: Add REQ_OP_PROVISION support Sarthak Kukreti
2023-05-19 15:23 ` Mike Snitzer
2023-06-08 21:24 ` Mike Snitzer
2023-06-09 0:28 ` Mike Snitzer
2023-05-18 22:33 ` [PATCH v7 5/5] loop: Add support for provision requests Sarthak Kukreti
2023-05-22 16:37 ` [dm-devel] " Darrick J. Wong
2023-05-22 22:09 ` Sarthak Kukreti
2023-05-23 1:22 ` Darrick J. Wong
2023-10-07 1:29 ` Sarthak Kukreti
2023-05-19 4:09 ` [PATCH v7 0/5] Introduce provisioning primitives Christoph Hellwig
2023-05-19 14:41 ` Mike Snitzer
2023-05-19 23:07 ` Dave Chinner
2023-05-22 18:27 ` Mike Snitzer
2023-05-23 14:05 ` Brian Foster
2023-05-23 15:26 ` Mike Snitzer
2023-05-24 0:40 ` Dave Chinner
2023-05-24 20:02 ` Mike Snitzer
2023-05-25 11:39 ` Dave Chinner
2023-05-25 16:00 ` Mike Snitzer
2023-05-25 22:47 ` Sarthak Kukreti
2023-05-26 1:36 ` Dave Chinner
2023-05-26 2:35 ` Sarthak Kukreti
2023-05-26 15:56 ` Brian Foster
2023-05-25 16:19 ` Brian Foster
2023-05-26 9:37 ` Dave Chinner
2023-05-26 15:47 ` Brian Foster
[not found] ` <CAJ0trDbspRaDKzTzTjFdPHdB9n0Q9unfu1cEk8giTWoNu3jP8g@mail.gmail.com>
2023-05-26 23:45 ` Dave Chinner
[not found] ` <CAJ0trDZJQwvAzngZLBJ1hB0XkQ1HRHQOdNQNTw9nK-U5i-0bLA@mail.gmail.com>
2023-05-30 14:02 ` Mike Snitzer
[not found] ` <CAJ0trDaUOevfiEpXasOESrLHTCcr=oz28ywJU+s+YOiuh7iWow@mail.gmail.com>
2023-05-30 15:28 ` Mike Snitzer
2023-06-02 18:44 ` Sarthak Kukreti
2023-06-02 21:50 ` Mike Snitzer
2023-06-03 0:52 ` Dave Chinner
2023-06-03 15:57 ` Mike Snitzer
2023-06-05 21:14 ` Sarthak Kukreti
2023-06-07 2:15 ` Dave Chinner
2023-06-07 23:27 ` Mike Snitzer
2023-06-09 20:31 ` Mike Snitzer
2023-06-09 21:54 ` Dave Chinner
2023-10-07 1:30 ` Sarthak Kukreti [this message]
2023-06-07 2:01 ` Dave Chinner
2023-06-07 23:50 ` Mike Snitzer
2023-06-09 3:32 ` Dave Chinner
2023-06-08 2:03 ` Martin K. Petersen
2023-06-09 0:10 ` Dave Chinner
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