linux-ext4 - Re: [EXT2] Discard unused sectors

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Message-Id: <1218704748.4620.50.camel@pmac.infradead.org>
Date:	Thu, 14 Aug 2008 10:05:48 +0100
From:	David Woodhouse <dwmw2@...radead.org>
To:	linux-ext4@...r.kernel.org
Subject: Re: [EXT2] Discard unused sectors

I'm not sure how to do this for ext[34]. The sb_issue_discard() function
issues its requests as a soft barrier, because for naïve callers it
needs to ensure that the discard happens _before_ any subsequent writes
to the same sectors (if they get reallocated immediately).

But ext[34] can probably do better than that, and submit the discard
requests _without_ barriers of their own. If someone with a bit more
clue does it, that is.

-- 
David Woodhouse                            Open Source Technology Centre
David.Woodhouse@...el.com                              Intel Corporation

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