linux-ext4 - Re: [PATCH v7 0/5] Introduce provisioning primitives

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Date:   Fri, 9 Jun 2023 13:32:56 +1000
From:   Dave Chinner <david@...morbit.com>
To:     Mike Snitzer <snitzer@...nel.org>
Cc:     Jens Axboe <axboe@...nel.dk>,
        Christoph Hellwig <hch@...radead.org>,
        Joe Thornber <thornber@...hat.com>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        "Darrick J. Wong" <djwong@...nel.org>,
        Jason Wang <jasowang@...hat.com>,
        Bart Van Assche <bvanassche@...gle.com>,
        linux-kernel@...r.kernel.org, Joe Thornber <ejt@...hat.com>,
        linux-block@...r.kernel.org, dm-devel@...hat.com,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        Sarthak Kukreti <sarthakkukreti@...omium.org>,
        linux-fsdevel@...r.kernel.org, Theodore Ts'o <tytso@....edu>,
        linux-ext4@...r.kernel.org, Brian Foster <bfoster@...hat.com>,
        Alasdair Kergon <agk@...hat.com>
Subject: Re: [PATCH v7 0/5] Introduce provisioning primitives

On Wed, Jun 07, 2023 at 07:50:25PM -0400, Mike Snitzer wrote:
> Do you think you're OK to scope out, and/or implement, the XFS changes
> if you use v7 of this patchset as the starting point? (v8 should just
> be v7 minus the dm-thin.c and dm-snap.c changes).  The thinp
> support in v7 will work enough to allow XFS to issue REQ_OP_PROVISION
> and/or fallocate (via mkfs.xfs) to dm-thin devices.

Yup, XFS only needs blkdev_issue_provision() and
bdev_max_provision_sectors() to be present.  filesystem code. The
initial XFS provisioning detection and fallocate() support is just
under 50 lines of new code...

Cheers,

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