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Date: Thu, 19 Dec 2019 21:22:36 -0500 From: "Martin K. Petersen" <martin.petersen@...cle.com> To: "Darrick J. Wong" <darrick.wong@...cle.com> Cc: "Martin K. Petersen" <martin.petersen@...cle.com>, Kirill Tkhai <ktkhai@...tuozzo.com>, axboe@...nel.dk, linux-block@...r.kernel.org, linux-kernel@...r.kernel.org, linux-ext4@...r.kernel.org, tytso@....edu, adilger.kernel@...ger.ca, ming.lei@...hat.com, osandov@...com, jthumshirn@...e.de, minwoo.im.dev@...il.com, damien.lemoal@....com, andrea.parri@...rulasolutions.com, hare@...e.com, tj@...nel.org, ajay.joshi@....com, sagi@...mberg.me, dsterba@...e.com, chaitanya.kulkarni@....com, bvanassche@....org, dhowells@...hat.com, asml.silence@...il.com Subject: Re: [PATCH RFC 1/3] block: Add support for REQ_OP_ASSIGN_RANGE operation Darrick, [Anchor] > What happens if you anchor and then try to read the results? IO > error? Depends on the device. Typically you get the same results as UNMAP. Anchoring is essentially a way to preallocate blocks on a thinly provisioned device. If you then run out of actual storage capacity you won't get a write failure writing to those LBAs. It is intended to protect block ranges that do not tolerate write failures (journals, metadata). -- Martin K. Petersen Oracle Linux Engineering
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