linux-kernel - Re: [PATCH, RFC] xfs: batched discard support

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Message-ID: <4A8CA956.2060406@rtr.ca>
Date:	Wed, 19 Aug 2009 21:39:34 -0400
From:	Mark Lord <liml@....ca>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	xfs@....sgi.com, linux-fsdevel@...r.kernel.org,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	jens.axboe@...cle.com,
	IDE/ATA development list <linux-ide@...r.kernel.org>
Subject: Re: [PATCH, RFC] xfs: batched discard support

[resending, after fixing the Cc: list; somebody trimmed it earlier]

Jamie Lokier wrote:
..
> I don't remember - does TRIM guarantee the blocks read zeros afterwards?
..

No, it doesn't.

A drive can optionally support "deterministic TRIM", whereby it will return
consistent data for any given trimmed sector afterwards, but that doesn't mean zeros.

-ml
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