linux-kernel - Re: [PATCH v9 0/3] [PATCH v9 0/3] Introduce provisioning primitives

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Message-ID: <ZVvCsPelezZesshx@dread.disaster.area>
Date:   Tue, 21 Nov 2023 07:33:52 +1100
From:   Dave Chinner <david@...morbit.com>
To:     Sarthak Kukreti <sarthakkukreti@...omium.org>
Cc:     dm-devel@...ts.linux.dev, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        Jens Axboe <axboe@...nel.dk>,
        Mike Snitzer <snitzer@...nel.org>,
        "Darrick J . Wong" <djwong@...nel.org>,
        Christoph Hellwig <hch@....de>,
        Brian Foster <bfoster@...hat.com>
Subject: Re: [PATCH v9 0/3] [PATCH v9 0/3] Introduce provisioning primitives

On Mon, Nov 13, 2023 at 01:26:51PM -0800, Sarthak Kukreti wrote:
> On Fri, Nov 10, 2023 at 4:56 PM Dave Chinner <david@...morbit.com> wrote:
> >
> > On Thu, Nov 09, 2023 at 05:01:35PM -0800, Sarthak Kukreti wrote:
> > > Hi,
> > >
> > > This patch series is version 9 of the patch series to introduce
> > > block-level provisioning mechanism (original [1]), which is useful for
> > > provisioning space across thinly provisioned storage architectures (loop
> > > devices backed by sparse files, dm-thin devices, virtio-blk). This
> > > series has minimal changes over v8[2], with a couple of patches dropped
> > > (suggested by Dave).
> > >
> > > This patch series is rebased from the linux-dm/dm-6.5-provision-support
> > > [3] on to (a12deb44f973 Merge tag 'input-for-v6.7-rc0' ...). The final
> > > patch in the series is a blktest (suggested by Dave in 4) which was used
> > > to test out the provisioning flow for loop devices on sparse files on an
> > > ext4 filesystem.
> >
> > What happened to the XFS patch I sent to support provisioning for
> > fallocate() operations through XFS?
> >
> Apologies, I missed out on mentioning that the XFS patches work well
> with loop devices.
> 
> I might have misunderstood: were those patches only for sanity testing
> or would you prefer that I send those out as a part of this series? I
> can whip up a quick v10 if so!

I was implying that if you are going to be adding support to random
block devices for people to actually test out, then you should be
adding support to filesystems and writing new -fstests- to ensure
that loop devices are actually provisioning blocks at exactly the
locations that correspond to the physical file extents the
filesystem provisioned, too.

-Dave.
-- 
Dave Chinner
david@...morbit.com