linux-kernel - Re: [patch 0/7] Add TRIM support for raid linear/0/1/10

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Message-ID: <20120314132422.3aeb6d49@notabene.brown>
Date:	Wed, 14 Mar 2012 13:24:22 +1100
From:	NeilBrown <neilb@...e.de>
To:	Shaohua Li <shli@...ionio.com>
Cc:	linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org,
	axboe@...nel.dk
Subject: Re: [patch 0/7] Add TRIM support for raid linear/0/1/10

On Mon, 12 Mar 2012 11:04:12 +0800 Shaohua Li <shli@...ionio.com> wrote:

> The patches add TRIM support for raid linear/0/1/10. I'll add TRIM support for
> raid 4/5/6 later. The implementation is pretty straightforward and
> self-explained.
> 
> Thanks,
> Shaohua

Thanks.
They look mostly OK.

In raid0.c, I think you'll need to change

		/* Sanity check -- queue functions should prevent this happening */
		if (bio->bi_vcnt != 1 ||
		    bio->bi_idx != 0)
			goto bad_map;

to also allow for 'bi_vcnt == 0' like you did in bio_split.

Also I wonder about handling failure in RAID1.
I think the code will currently treat it like a write error, and
maybe record a bad block (then fail the device is writing the badblock
record fails). Is that what were want?

And of course resync/recovery will mess up the discarded sector information,
so this isn't a complete solution for RAID1.  But  it is a reasonable start.

Thanks,
NeilBrown

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