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Date:   Wed, 01 Apr 2020 22:29:38 -0400
From:   "Martin K. Petersen" <>
To:     Konstantin Khlebnikov <>
Cc:     Chaitanya Kulkarni <>,,,,,,,,,,,,,,,,,,,,,
Subject: Re: [PATCH 0/4] block: Add support for REQ_OP_ASSIGN_RANGE


>> The corresponding exported primitive is called
>> blkdev_issue_assign_range().
> What exact semantics of that?

REQ_OP_ALLOCATE will be used to compel a device to allocate a block
range. What a given block contains after successful allocation is
undefined (depends on the device implementation).

For block allocation with deterministic zeroing, one must keep using
REQ_OP_WRITE_ZEROES with the NOUNMAP flag set.

Martin K. Petersen	Oracle Linux Engineering

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