linux-kernel - Re: [PATCH v5] fat: Batched discard support for fat

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Message-ID: <87y63z4s3e.fsf@devron.myhome.or.jp>
Date:	Mon, 28 Mar 2011 16:33:25 +0900
From:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
To:	Kyungmin Park <kmpark@...radead.org>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	Lukas Czerner <lczerner@...hat.com>
Subject: Re: [PATCH v5] fat: Batched discard support for fat

Kyungmin Park <kmpark@...radead.org> writes:

>> Yes. It's what I'm saying. If user wants to trim 0-2 then user will
>> specify 0-2, but this trims only 2. It's not right.
>
> There's similar code at ext4. it adjusts the start and len value if
> given start is less than first_data_blk.
>
>        if (start < first_data_blk) {
>                 len -= first_data_blk - start;
>                 start = first_data_blk;
>         }

Oh, strange design. On this design, user have to know which block is
actually start block per FSes (Yeah, you can still use this without
start block knowledge. But it's bogus). I think it should fix ext4. No?

Thanks.
-- 
OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
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