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Date: Thu, 28 Nov 2024 17:40:02 +0100
From: Christoph Hellwig <hch@lst.de>
To: Keith Busch <kbusch@kernel.org>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>,
	Bart Van Assche <bvanassche@acm.org>,
	Nitesh Shetty <nj.shetty@samsung.com>,
	Javier Gonzalez <javier.gonz@samsung.com>,
	Matthew Wilcox <willy@infradead.org>,
	Christoph Hellwig <hch@lst.de>, Keith Busch <kbusch@meta.com>,
	"linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
	"linux-nvme@lists.infradead.org" <linux-nvme@lists.infradead.org>,
	"linux-scsi@vger.kernel.org" <linux-scsi@vger.kernel.org>,
	"io-uring@vger.kernel.org" <io-uring@vger.kernel.org>,
	"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
	"joshi.k@samsung.com" <joshi.k@samsung.com>
Subject: Re: [PATCHv10 0/9] write hints with nvme fdp, scsi streams
Message-ID: <20241128164002.GA26959@lst.de>
References: <2b5a365a-215a-48de-acb1-b846a4f24680@acm.org> <20241111093154.zbsp42gfiv2enb5a@ArmHalley.local> <a7ebd158-692c-494c-8cc0-a82f9adf4db0@acm.org> <20241112135233.2iwgwe443rnuivyb@ubuntu> <yq1ed38roc9.fsf@ca-mkp.ca.oracle.com> <9d61a62f-6d95-4588-bcd8-de4433a9c1bb@acm.org> <yq1plmhv3ah.fsf@ca-mkp.ca.oracle.com> <8ef1ec5b-4b39-46db-a4ed-abf88cbba2cd@acm.org> <yq1jzcov5am.fsf@ca-mkp.ca.oracle.com> <Z0iKbPttERXaiexO@kbusch-mbp>
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On Thu, Nov 28, 2024 at 08:21:16AM -0700, Keith Busch wrote:
> I think of copy a little differently. When you do a normal write
> command, the host provides the controller a vector of sources and
> lengths. A copy command is like a write command, but the sources are
> just logical block addresses instead of memory addresses.
> 
> Whatever solution happens, it would be a real shame if it doesn't allow
> vectored LBAs. The token based source bio doesn't seem to extend to
> that.

POPULATE TOKEN as defined by SCSI/SBC takes a list of LBA ranges as
well.