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Date:   Thu, 19 Dec 2019 21:22:36 -0500
From:   "Martin K. Petersen" <>
To:     "Darrick J. Wong" <>
Cc:     "Martin K. Petersen" <>,
        Kirill Tkhai <>,,,,,,,,,,,,,,,,,,,,,
Subject: Re: [PATCH RFC 1/3] block: Add support for REQ_OP_ASSIGN_RANGE operation



> 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,

Martin K. Petersen	Oracle Linux Engineering

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