linux-ext4 - Re: [PATCH] ext4: save goal group and offset in struct ext4_allocation_context.ac_g

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Message-ID: <20140729135819.GA2256@thunk.org>
Date:	Tue, 29 Jul 2014 09:58:19 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Xiaoguang Wang <wangxg.fnst@...fujitsu.com>
Cc:	linux-ext4@...r.kernel.org, adilger@...ger.ca, lczerner@...hat.com
Subject: Re: [PATCH] ext4: save goal group and offset in struct
 ext4_allocation_context.ac_g_ex

On Wed, Jul 23, 2014 at 05:47:41PM +0800, Xiaoguang Wang wrote:
> In ext4_mb_normalize_request(), if ac_g_ex.fe_logical is adjacent to the closest logical
> allocated block to the left or (ac_g_ex.fe_logical+len) adjacent to the closest logical
> allocated block to the right, we'll attach EXT4_MB_HINT_TRY_GOAL flag taking the physical
> block (ext4_allocation_request.lleft+1) or (ext4_allocation_request.pright-len) as a goal,
> and put this information in ext4_allocation_context.ac_f_ex.
> 
> But look at the ext4_mb_find_by_goal(), indeed it use ac_g_ex to look up, so this is wrong,
> we should save goal group and offset in struct ext4_allocation_context.ac_g_ex.
> 
> Signed-off-by: Xiaoguang Wang <wangxg.fnst@...fujitsu.com>

Nice catch!

Thanks, applied.

					- Ted
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