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From: Johannes Thumshirn <Johannes.Thumshirn@wdc.com>
To: Damien Le Moal <damien.lemoal@opensource.wdc.com>,
	Luis Chamberlain <mcgrof@kernel.org>
Cc: Theodore Ts'o <tytso@mit.edu>, Christoph Hellwig <hch@lst.de>,
	Pankaj Raghav <p.raghav@samsung.com>,
	"axboe@kernel.dk" <axboe@kernel.dk>,
	"pankydev8@gmail.com" <pankydev8@gmail.com>,
	"gost.dev@samsung.com" <gost.dev@samsung.com>,
	"jiangbo.365@bytedance.com" <jiangbo.365@bytedance.com>,
	"linux-nvme@lists.infradead.org" <linux-nvme@lists.infradead.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
	"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
	"dm-devel@redhat.com" <dm-devel@redhat.com>,
	"dsterba@suse.com" <dsterba@suse.com>,
	"linux-btrfs@vger.kernel.org" <linux-btrfs@vger.kernel.org>
Subject: Re: [dm-devel] [PATCH v4 00/13] support non power of 2 zoned devices
Date: Thu, 19 May 2022 07:34:43 +0000	[thread overview]
Message-ID: <PH0PR04MB74166C87F694B150A5AE0F009BD09@PH0PR04MB7416.namprd04.prod.outlook.com> (raw)
In-Reply-To: 69f06f90-d31b-620b-9009-188d1d641562@opensource.wdc.com

On 19/05/2022 05:19, Damien Le Moal wrote:
> On 5/19/22 12:12, Luis Chamberlain wrote:
>> On Thu, May 19, 2022 at 12:08:26PM +0900, Damien Le Moal wrote:
>>> On 5/18/22 00:34, Theodore Ts'o wrote:
>>>> On Tue, May 17, 2022 at 10:10:48AM +0200, Christoph Hellwig wrote:
>>>>> I'm a little surprised about all this activity.
>>>>>
>>>>> I though the conclusion at LSF/MM was that for Linux itself there
>>>>> is very little benefit in supporting this scheme.  It will massively
>>>>> fragment the supported based of devices and applications, while only
>>>>> having the benefit of supporting some Samsung legacy devices.
>>>>
>>>> FWIW,
>>>>
>>>> That wasn't my impression from that LSF/MM session, but once the
>>>> videos become available, folks can decide for themselves.
>>>
>>> There was no real discussion about zone size constraint on the zone
>>> storage BoF. Many discussions happened in the hallway track though.
>>
>> Right so no direct clear blockers mentioned at all during the BoF.
> 
> Nor any clear OK.

So what about creating a device-mapper target, that's taking npo2 drives and
makes them po2 drives for the FS layers? It will be very similar code to 
dm-linear.

After all zoned support for FSes started with a device-mapper (dm-zoned) and 
as the need for a more integrated solution arose, it changed into natiive
support.

And all that is there is simple arithmetic and a bio_clone(), if this is the
slowest part of the stack involving a FS like f2fs or btrfs I'm throwing a
round of anyone's favorite beverage at next year's LSFMM.

Byte,
	Johannes


  reply	other threads:[~2022-05-19  7:35 UTC|newest]

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20220516165418eucas1p2be592d9cd4b35f6b71d39ccbe87f3fef@eucas1p2.samsung.com>
2022-05-16 16:54 ` [PATCH v4 00/13] support non power of 2 zoned devices Pankaj Raghav
     [not found]   ` <CGME20220516165419eucas1p104aadda60df323e6154bfc3b92103b7b@eucas1p1.samsung.com>
2022-05-16 16:54     ` [PATCH v4 01/13] block: make blkdev_nr_zones and blk_queue_zone_no generic for npo2 zsze Pankaj Raghav
     [not found]   ` <CGME20220516165421eucas1p2515446ac290987bdb9af24ffb835b287@eucas1p2.samsung.com>
2022-05-16 16:54     ` [PATCH v4 02/13] block: allow blk-zoned devices to have non-power-of-2 zone size Pankaj Raghav
2022-05-16 19:05       ` Pankaj Raghav
     [not found]   ` <CGME20220516165422eucas1p174acec28848a9c2178376f092af3fa1c@eucas1p1.samsung.com>
2022-05-16 16:54     ` [PATCH v4 03/13] nvme: zns: Allow ZNS drives that have non-power_of_2 " Pankaj Raghav
     [not found]   ` <CGME20220516165424eucas1p2ee38cd64260539e5cac8d1fa4d0cba38@eucas1p2.samsung.com>
2022-05-16 16:54     ` [PATCH v4 04/13] nvmet: Allow ZNS target to support non-power_of_2 zone sizes Pankaj Raghav
2022-05-17 14:19       ` Johannes Thumshirn
     [not found]   ` <CGME20220516165425eucas1p29fcd11d7051d9d3a9a9efc17cd3b6999@eucas1p2.samsung.com>
2022-05-16 16:54     ` [PATCH v4 05/13] btrfs: zoned: Cache superblock location in btrfs_zoned_device_info Pankaj Raghav
2022-05-16 21:58       ` David Sterba
2022-05-17  7:55         ` Pankaj Raghav
     [not found]   ` <CGME20220516165427eucas1p1cfd87ca44ec314ea1d2ddc8ece7259f9@eucas1p1.samsung.com>
2022-05-16 16:54     ` [PATCH v4 06/13] btrfs: zoned: Make sb_zone_number function non power of 2 compatible Pankaj Raghav
2022-05-17  6:53       ` Johannes Thumshirn
2022-05-17 11:51         ` David Sterba
     [not found]   ` <CGME20220516165428eucas1p1374b5f9592db3ca6a6551aff975537ce@eucas1p1.samsung.com>
2022-05-16 16:54     ` [PATCH v4 07/13] btrfs: zoned: use generic btrfs zone helpers to support npo2 zoned devices Pankaj Raghav
2022-05-17 12:30       ` David Sterba
2022-05-18  9:40         ` Pankaj Raghav
2022-05-18 11:21           ` David Sterba
2022-05-19  4:13       ` Naohiro Aota
     [not found]   ` <CGME20220516165429eucas1p272c8b4325a488675f08f2d7016aa6230@eucas1p2.samsung.com>
2022-05-16 16:54     ` [PATCH v4 08/13] btrfs:zoned: make sb for npo2 zone devices align with sb log offsets Pankaj Raghav
2022-05-17  6:50       ` Johannes Thumshirn
2022-05-17  8:00         ` Pankaj Raghav
2022-05-17 12:42       ` David Sterba
2022-05-18  9:15         ` Pankaj Raghav
2022-05-19  7:57           ` Johannes Thumshirn
2022-05-20  9:06             ` Pankaj Raghav
2022-05-20  9:15               ` Johannes Thumshirn
2022-05-19  7:59       ` Naohiro Aota
2022-05-20  9:09         ` Pankaj Raghav
     [not found]   ` <CGME20220516165430eucas1p214cca8eaba1db2c98d947444cad4f18f@eucas1p2.samsung.com>
2022-05-16 16:54     ` [PATCH v4 09/13] btrfs: zoned: relax the alignment constraint for zoned devices Pankaj Raghav
     [not found]   ` <CGME20220516165432eucas1p2e1ea74d44738e44745f49e37b6b9e503@eucas1p2.samsung.com>
2022-05-16 16:54     ` [PATCH v4 10/13] zonefs: allow non power of 2 " Pankaj Raghav
     [not found]   ` <CGME20220516165434eucas1p12b178fb83cc93470933e3d72c40e9004@eucas1p1.samsung.com>
2022-05-16 16:54     ` [PATCH v4 11/13] null_blk: " Pankaj Raghav
2022-05-17  4:12       ` kernel test robot
     [not found]   ` <CGME20220516165435eucas1p1dff8d9d039a76278ef1c09dba4b4e1fe@eucas1p1.samsung.com>
2022-05-16 16:54     ` [PATCH v4 12/13] null_blk: use zone_size_sects_shift for " Pankaj Raghav
     [not found]   ` <CGME20220516165436eucas1p178d079302dae3a9fca696b13b0390deb@eucas1p1.samsung.com>
2022-05-16 16:54     ` [PATCH v4 13/13] dm-zoned: ensure only power of 2 zone sizes are allowed Pankaj Raghav
2022-05-17  8:10   ` [PATCH v4 00/13] support non power of 2 zoned devices Christoph Hellwig
2022-05-17  9:18     ` Javier González
2022-05-18  8:00       ` Christoph Hellwig
2022-05-19 15:25         ` Javier González
2022-05-17 15:34     ` [dm-devel] " Theodore Ts'o
2022-05-18 23:06       ` Luis Chamberlain
2022-05-19  3:08       ` Damien Le Moal
2022-05-19  3:12         ` Luis Chamberlain
2022-05-19  3:19           ` Damien Le Moal
2022-05-19  7:34             ` Johannes Thumshirn [this message]
2022-05-20  3:47               ` Damien Le Moal
2022-05-20  6:07                 ` Hannes Reinecke
2022-05-20  6:27                   ` Javier González
2022-05-20  6:41                     ` Damien Le Moal
     [not found]                       ` <CGME20220520065941eucas1p105cf273ede995dc4bf92f3245fad09b1@eucas1p1.samsung.com>
2022-05-20  6:59                         ` Javier González
2022-05-20  9:30                       ` Pankaj Raghav
2022-05-20 17:18                         ` David Sterba
2022-05-23  8:25                           ` Pankaj Raghav
2022-05-20  9:30                     ` Johannes Thumshirn
     [not found]                       ` <CGME20220520101610eucas1p1822ca6014e2a1d55ae74476f83c4de1d@eucas1p1.samsung.com>
2022-05-20 10:16                         ` Javier González
     [not found] <CGME20220516133922eucas1p1c891cd1d82539b4e792acb5d1aa74444@eucas1p1.samsung.com>
2022-05-16 13:39 ` Pankaj Raghav
2022-05-16 14:15   ` [dm-devel] " Damien Le Moal

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