linux-ext4 - Re: [PATCH 2/2] Add batched discard support for ext4.

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Date:	Mon, 26 Apr 2010 10:00:36 -0400
From:	Mark Lord <kernel@...savvy.com>
To:	Ric Wheeler <rwheeler@...hat.com>
CC:	Greg Freemyer <greg.freemyer@...il.com>,
	Eric Sandeen <sandeen@...hat.com>,
	Lukas Czerner <lczerner@...hat.com>,
	Jeff Moyer <jmoyer@...hat.com>, linux-ext4@...r.kernel.org,
	Edward Shishkin <eshishki@...hat.com>,
	Eric Sandeen <esandeen@...hat.com>,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH 2/2] Add batched discard support for ext4.

On 24/04/10 02:41 PM, Ric Wheeler wrote:
..
> I don't like the user space wiper.sh approach in general, but running
> wiper.sh is entirely your choice.
>
> Most users prefer having the file system and the IO stack take care of
> this for them, but again, entirely configurable.
..

I wrote wiper.sh, and I would prefer more of an in-kernel solution,
simply because it could potentially have the smarts to deal with RAID,
LVM, and btrfs's own duplicate implementation of RAID/LVM.

Those cannot be done from userspace on a mounted filesystem.

So.. again.. in an ideal kernel, I'd like to see use of larger ranges
(and _multiple_ ranges) per TRIM command.  And options for the kernel
to do it automatically (-o discard), as well as an ioctl() interface
for userspace to "scrub" (or "wipe") all free ranges in a gradual fashion.

Cheers

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