Re: [dm-devel] [PATCH 01/27] target: remove an incorrect unmap zeroes data deduction

Martin K. Petersen
2022-04-07T03:07:35Z

Christoph,

> For block devices the target code implements UNMAP as calls to
> blkdev_issue_discard, which does not guarantee zeroing just because
> Write Zeroes is supported.
>
> Note that this does not affect the file backed path which uses
> fallocate to punch holes.
>
> Fixes: 2237498f0b5c ("target/iblock: Convert WRITE_SAME to blkdev_issue_zeroout")
> Signed-off-by: Christoph Hellwig <hch@lst.de>

--
Martin K. Petersen Oracle Linux Engineering