From: Bart Van Assche <bvanassche@acm.org>
To: Christoph Hellwig <hch@lst.de>, Damien Le Moal <dlemoal@kernel.org>
Cc: Nitesh Shetty <nj.shetty@samsung.com>,
Jens Axboe <axboe@kernel.dk>, Jonathan Corbet <corbet@lwn.net>,
Alasdair Kergon <agk@redhat.com>,
Mike Snitzer <snitzer@kernel.org>,
Mikulas Patocka <mpatocka@redhat.com>,
Keith Busch <kbusch@kernel.org>, Sagi Grimberg <sagi@grimberg.me>,
Chaitanya Kulkarni <kch@nvidia.com>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Christian Brauner <brauner@kernel.org>, Jan Kara <jack@suse.cz>,
martin.petersen@oracle.com, david@fromorbit.com, hare@suse.de,
damien.lemoal@opensource.wdc.com, anuj20.g@samsung.com,
joshi.k@samsung.com, nitheshshetty@gmail.com,
gost.dev@samsung.com, linux-block@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org,
dm-devel@lists.linux.dev, linux-nvme@lists.infradead.org,
linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH v20 02/12] Add infrastructure for copy offload in block and request layer.
Date: Fri, 28 Jun 2024 06:53:32 -0700 [thread overview]
Message-ID: <4c7f30af-9fbc-4f19-8f48-ad741aa557c4@acm.org> (raw)
In-Reply-To: <20240626052238.GC21996@lst.de>
On 6/25/24 10:22 PM, Christoph Hellwig wrote:
> It's not just dm. You also need it in the partition remapping code
> (mandatory), md (nice to have), etc.
>
> And then we have the whole mess of what is in the payload for the I/O
> stack vs what is in the payload for the on the wire protocol, which
> will have different formatting and potentially also different sizes.
Drivers like dm-linear rely on bio splitting. If the COPY_SRC and
COPY_DST operations travel independently down a stacked block driver
hierarchy, a separate data structure is needed to keep track of which
operations have been split and to combine the split operations into
requests. Isn't this an argument in favor of storing the source and
destination parameters in a single bio?
Thanks,
Bart.
next prev parent reply other threads:[~2024-06-28 13:54 UTC|newest]
Thread overview: 86+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20240520102747epcas5p33497a911ca70c991e5da8e22c5d1336b@epcas5p3.samsung.com>
2024-05-20 10:20 ` [PATCH v20 00/12] Implement copy offload support Nitesh Shetty
[not found] ` <CGME20240520102830epcas5p27274901f3d0c2738c515709890b1dec4@epcas5p2.samsung.com>
2024-05-20 10:20 ` [PATCH v20 01/12] block: Introduce queue limits and sysfs for copy-offload support Nitesh Shetty
2024-05-20 14:33 ` Damien Le Moal
2024-05-21 8:15 ` Nitesh Shetty
2024-05-20 22:42 ` Bart Van Assche
2024-05-21 14:25 ` Nitesh Shetty
2024-05-22 17:49 ` Bart Van Assche
2024-05-23 7:05 ` Nitesh Shetty
2024-05-21 6:57 ` Hannes Reinecke
2024-06-01 5:53 ` Christoph Hellwig
2024-06-03 6:43 ` Nitesh Shetty
[not found] ` <CGME20240520102842epcas5p4949334c2587a15b8adab2c913daa622f@epcas5p4.samsung.com>
2024-05-20 10:20 ` [PATCH v20 02/12] Add infrastructure for copy offload in block and request layer Nitesh Shetty
2024-05-20 15:00 ` Damien Le Moal
2024-05-21 10:50 ` Nitesh Shetty
2024-05-20 23:00 ` Bart Van Assche
2024-05-21 11:17 ` Nitesh Shetty
2024-05-22 17:58 ` Bart Van Assche
2024-05-21 7:01 ` Hannes Reinecke
2024-05-24 6:54 ` Nitesh Shetty
[not found] ` <66503bc7.630a0220.56c85.8b9dSMTPIN_ADDED_BROKEN@mx.google.com>
2024-05-24 13:52 ` Bart Van Assche
2024-05-27 8:27 ` Nitesh Shetty
2024-05-28 14:07 ` Bart Van Assche
2024-05-22 18:05 ` Bart Van Assche
2024-05-23 11:34 ` Nitesh Shetty
2024-05-24 20:33 ` Bart Van Assche
2024-05-29 6:17 ` Nitesh Shetty
2024-05-29 7:48 ` Damien Le Moal
2024-05-29 22:41 ` Bart Van Assche
2024-05-30 7:16 ` Nitesh Shetty
[not found] ` <665850bd.050a0220.a5e6b.5b72SMTPIN_ADDED_BROKEN@mx.google.com>
2024-05-30 17:11 ` Bart Van Assche
2024-05-31 10:17 ` Nitesh Shetty
[not found] ` <6659b691.630a0220.90195.d0ebSMTPIN_ADDED_BROKEN@mx.google.com>
2024-05-31 23:45 ` Bart Van Assche
2024-06-01 5:59 ` Christoph Hellwig
2024-06-03 17:12 ` Bart Van Assche
2024-06-04 4:40 ` Christoph Hellwig
2024-06-04 11:44 ` Bart Van Assche
2024-06-05 8:20 ` Christoph Hellwig
[not found] ` <CGME20240624105121epcas5p3a5a8c73bd5ef19c02e922e5829a4dff0@epcas5p3.samsung.com>
2024-06-24 10:44 ` Nitesh Shetty
[not found] ` <6679526f.170a0220.9ffd.aefaSMTPIN_ADDED_BROKEN@mx.google.com>
2024-06-24 16:25 ` Bart Van Assche
2024-06-24 21:55 ` Damien Le Moal
2024-06-25 18:18 ` Bart Van Assche
2024-06-25 21:18 ` Damien Le Moal
2024-06-26 5:22 ` Christoph Hellwig
2024-06-28 13:53 ` Bart Van Assche [this message]
[not found] ` <66795280.630a0220.f3ccd.b80cSMTPIN_ADDED_BROKEN@mx.google.com>
2024-06-24 22:58 ` Keith Busch
[not found] ` <CGME20240606072827epcas5p285de8d4f3b0f6d3a87f8341414336b42@epcas5p2.samsung.com>
2024-06-06 7:28 ` Nitesh Shetty
[not found] ` <66618886.630a0220.4d4fc.1c9cSMTPIN_ADDED_BROKEN@mx.google.com>
2024-06-06 16:44 ` Bart Van Assche
2024-06-01 5:57 ` Christoph Hellwig
[not found] ` <CGME20240520102853epcas5p42d635d6712b8876ea22a45d730cb1378@epcas5p4.samsung.com>
2024-05-20 10:20 ` [PATCH v20 03/12] block: add copy offload support Nitesh Shetty
2024-06-01 6:16 ` Christoph Hellwig
2024-06-04 10:50 ` Nitesh Shetty
[not found] ` <CGME20240520102906epcas5p15b5a0b3c8edd0bf3073030a792a328bb@epcas5p1.samsung.com>
2024-05-20 10:20 ` [PATCH v20 04/12] block: add emulation for copy Nitesh Shetty
2024-05-21 7:06 ` Hannes Reinecke
2024-05-21 11:29 ` Nitesh Shetty
2024-06-01 6:18 ` Christoph Hellwig
[not found] ` <CGME20240520102917epcas5p1bda532309b9174bf2702081f6f58daf7@epcas5p1.samsung.com>
2024-05-20 10:20 ` [PATCH v20 05/12] fs/read_write: Enable copy_file_range for block device Nitesh Shetty
2024-05-21 7:07 ` Hannes Reinecke
2024-05-25 23:02 ` Dave Chinner
2024-05-28 5:57 ` Nitesh Shetty
[not found] ` <CGME20240520102929epcas5p2f4456f6fa0005d90769615eb2c2bf273@epcas5p2.samsung.com>
2024-05-20 10:20 ` [PATCH v20 06/12] fs, block: copy_file_range for def_blk_ops for direct " Nitesh Shetty
2024-05-25 23:09 ` Dave Chinner
2024-05-27 8:43 ` Nitesh Shetty
[not found] ` <CGME20240520102940epcas5p2b5f38ceabe94bed3905fb386a0d65ec7@epcas5p2.samsung.com>
2024-05-20 10:20 ` [PATCH v20 07/12] nvme: add copy offload support Nitesh Shetty
2024-06-01 6:22 ` Christoph Hellwig
2024-06-03 11:43 ` Nitesh Shetty
[not found] ` <CGME20240520102952epcas5p18716d203d1810c38397e7fcc9a26922a@epcas5p1.samsung.com>
2024-05-20 10:20 ` [PATCH v20 08/12] nvmet: add copy command support for bdev and file ns Nitesh Shetty
[not found] ` <CGME20240520103004epcas5p4a18f3f6ba0f218d57b0ab4bb84c6ff18@epcas5p4.samsung.com>
2024-05-20 10:20 ` [PATCH v20 09/12] dm: Add support for copy offload Nitesh Shetty
2024-05-21 7:11 ` Hannes Reinecke
2024-05-21 14:08 ` Nitesh Shetty
2024-05-22 6:22 ` Hannes Reinecke
2024-05-22 7:10 ` Nitesh Shetty
[not found] ` <CGME20240520103016epcas5p31b9a0f3637959626d49763609ebda6ef@epcas5p3.samsung.com>
2024-05-20 10:20 ` [PATCH v20 10/12] dm: Enable copy offload for dm-linear target Nitesh Shetty
2024-05-20 23:25 ` Bart Van Assche
2024-05-21 14:48 ` Nitesh Shetty
[not found] ` <CGME20240520103027epcas5p4789defe8ab3bff23bd2abcf019689fa2@epcas5p4.samsung.com>
2024-05-20 10:20 ` [PATCH v20 11/12] null: Enable trace capability for null block Nitesh Shetty
2024-05-20 23:27 ` Bart Van Assche
2024-06-01 6:23 ` Christoph Hellwig
2024-06-03 11:04 ` Nitesh Shetty
[not found] ` <CGME20240520103039epcas5p4373f7234162a32222ac225b976ae30ce@epcas5p4.samsung.com>
2024-05-20 10:20 ` [PATCH v20 12/12] null_blk: add support for copy offload Nitesh Shetty
2024-05-20 23:42 ` Bart Van Assche
2024-05-21 14:46 ` Nitesh Shetty
2024-05-22 17:52 ` Bart Van Assche
2024-05-23 6:55 ` Nitesh Shetty
2024-05-20 22:54 ` [PATCH v20 00/12] Implement copy offload support Bart Van Assche
2024-06-01 5:47 ` Christoph Hellwig
2024-06-03 10:53 ` Nitesh Shetty
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