linux-ext4 - Re: [PATCH 1/2] fs: Do not dispatch FITRIM through separate super

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Date:	Fri, 19 Nov 2010 09:06:39 -0500
From:	Christoph Hellwig <hch@...radead.org>
To:	Mark Lord <kernel@...savvy.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Greg Freemyer <greg.freemyer@...il.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	James Bottomley <James.Bottomley@...e.de>,
	Jeff Moyer <jmoyer@...hat.com>,
	Matthew Wilcox <matthew@....cx>,
	Josef Bacik <josef@...hat.com>,
	Lukas Czerner <lczerner@...hat.com>, tytso@....edu,
	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, sandeen@...hat.com
Subject: Re: [PATCH 1/2] fs: Do not dispatch FITRIM through separate
 super_operation

On Fri, Nov 19, 2010 at 09:01:02AM -0500, Mark Lord wrote:
> That is my intent already, thanks.  Just needs time, perhaps this winter.

This wasn't addressed at you, but a snide remark at Greg, who is just
contantly bickering without actually beeing any help.

> I think a reasonable approach would be to modify the existing interfaces
> so that the LLD can report a "max discard ranges per command" back up
> the stack.
> 
> This way, libata could report a max of say, 64 ranges per "discard" (trim),
> and DM/RAID could simply (for now) report a max of one range per discard.

That's certainly the easy way out.  You'll need a good way to actually
transport the ranges as we can't simply sote them in bi_sector/bi_size
and adapt the whole block layer to deal with the two types of different
discards.  Not saying it's impossible, but when I tried it before it
wasn't pretty.

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