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Date:   Tue, 10 Oct 2023 15:42:53 -0700
From:   Sarthak Kukreti <>
To:     Dave Chinner <>
Cc:,,,,, Jens Axboe <>,
        Alasdair Kergon <>,
        Mike Snitzer <>,
        Christoph Hellwig <>,
        Brian Foster <>,
        "Theodore Ts'o" <>,
        Andreas Dilger <>,
        Bart Van Assche <>,
        "Darrick J. Wong" <>
Subject: Re: [PATCH v8 0/5] Introduce provisioning primitives

On Sun, Oct 8, 2023 at 4:50 PM Dave Chinner <> wrote:
> On Fri, Oct 06, 2023 at 06:28:12PM -0700, Sarthak Kukreti wrote:
> > Hi,
> >
> > This patch series is version 8 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 v7[2].
> >
> > This patch series is rebased from the linux-dm/dm-6.5-provision-support [1] on to
> > (cac405a3bfa2 Merge tag 'for-6.6-rc3-tag'). In addition, there's an
> > additional patch to allow passing through an unshare intent via REQ_OP_PROVISION
> > (suggested by Darrick in [4]).
> The XFS patches I just posted were smoke tested a while back against
> loop devices and then forward ported to this patchset. Good for
> testing that userspace driven file preallocation gets propagated by
> the filesystem down to the backing device correctly and that
> subsequent IO to the file then does the right thing (e.g. fio
> testing using fallocate() to set up the files being written to)....

Thanks! I've been testing with a WIP patch for ext4, I'll give your
patches a try. Once we are closer to submitting the filesystem
support, we can formalize the test into an xfstest (sparse file + loop
+ filesystem, fallocate() file, check the size of the underlying
sparse file).


- Sarthak

> -Dave.
> --
> Dave Chinner

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