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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: wdc.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: BL0PR04MB6514.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: ebf593b0-40b1-4f22-cab3-08d903180647 X-MS-Exchange-CrossTenant-originalarrivaltime: 19 Apr 2021 09:46:36.8027 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: b61c8803-16f3-4c35-9b17-6f65f441df86 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: BE3Pds+nebfcoaAzLQrkvZRpVcMvDNrAneZDak6IZItjx21vANLf8T8BTcxAJ2J9GAvvoYWfQaC9JUz3uxl0mg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL0PR04MB4529 Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org On 2021/04/19 18:41, hch@infradead.org wrote:=0A= > On Mon, Apr 19, 2021 at 09:35:37AM +0000, Damien Le Moal wrote:=0A= >> This is only to avoid someone from running zoned-btrfs on top of dm-cryp= t.=0A= >> Without this patch, mount will be OK and file data writes will also actu= ally be=0A= >> OK. But all reads will miserably fail... I would rather have this patch = in than=0A= >> deal with the "bug reports" about btrfs failing to read files. No ?=0A= >>=0A= >> Note that like you, I dislike having to add such code. But it was my ove= rsight=0A= >> when I worked on getting dm-crypt to work on zoned drives. Zone append w= as=0A= >> overlooked at that time... My bad, really.=0A= > =0A= > dm-crypt needs to stop pretending it supports zoned devices if it=0A= > doesn't. Note that dm-crypt could fairly trivially support zone append= =0A= > by doing the same kind of emulation that the sd driver does.=0A= =0A= I am not so sure about the "trivial" but yes, it is feasible. Let me think = about=0A= something then. Whatever we do, performance with ZNS will no be great, for= =0A= sure... But for SMR HDDs, we likely will not notice any difference in perfo= rmance.=0A= =0A= =0A= -- =0A= Damien Le Moal=0A= Western Digital Research=0A=