| To: | Ingo Molnar <mingo@xxxxxxx> |
|---|---|
| Subject: | Re: [PATCH, RFC] xfs: batched discard support |
| From: | Mark Lord <liml@xxxxxx> |
| Date: | Wed, 19 Aug 2009 21:39:34 -0400 |
| Cc: | Christoph Hellwig <hch@xxxxxxxxxxxxx>, Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>, Paul Mackerras <paulus@xxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, xfs@xxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, linux-scsi@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, jens.axboe@xxxxxxxxxx, IDE/ATA development list <linux-ide@xxxxxxxxxxxxxxx> |
| In-reply-to: | <20090819203916.GA25296@xxxxxxx> |
| Organization: | Real-Time Remedies Inc. |
| References: | <20090816004705.GA7347@xxxxxxxxxxxxx> <20090819203916.GA25296@xxxxxxx> |
| User-agent: | Thunderbird 2.0.0.22 (X11/20090608) |
[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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