Re: [PATCH] block: reintroduce discard_zeroes_data sysfs file and BLKDISCARDZEROES

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To: Lukas Czerner <lczerner@xxxxxxxxxx>
Subject: Re: [PATCH] block: reintroduce discard_zeroes_data sysfs file and BLKDISCARDZEROES
From: Christoph Hellwig <hch@xxxxxx>
Date: Wed, 16 Aug 2017 17:18:03 +0200
Cc: linux-fsdevel@xxxxxxxxxxxxxxx, axboe@xxxxxxxxx, martin.petersen@xxxxxxxxxx, hch@xxxxxx
In-reply-to: <1502889581-19483-1-git-send-email-lczerner@redhat.com>
User-agent: Mutt/1.5.17 (2007-11-01)

The patch is incorrect - just because we support zeroing using
write zero doesn't mean that any discard will zero the data.

This subtle difference was one of the main point for the changes.

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  - From: Lukas Czerner

References:
- [PATCH] block: reintroduce discard_zeroes_data sysfs file and BLKDISCARDZEROES
  - From: Lukas Czerner

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