linux-ext4 - Re: [PATCH 0/5] mballoc: trivial code cleanup

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Message-ID: <20110207174125.GB3457@thunk.org>
Date:	Mon, 7 Feb 2011 12:41:25 -0500
From:	Ted Ts'o <tytso@....edu>
To:	Amir Goldstein <amir73il@...il.com>
Cc:	i@...y.li, linux-ext4@...r.kernel.org,
	Alex Tomas <alex@...sterfs.com>,
	Theodore Tso <tytso@...gle.com>
Subject: Re: [PATCH 0/5] mballoc: trivial code cleanup

On Sun, Feb 06, 2011 at 10:43:58AM +0200, Amir Goldstein wrote:
> When looking at alloc_sem, I realized that it is only needed to avoid
> race with adjacent group buddy initialization.

Actually, alloc_sem is used to protect all of the block group specific
data structures; the buddy bitmap counters, adjusting the buddy bitmap
itself, the largest free order in a block group, etc.  So even in the
case where block_size == page_size, alloc_sem is still needed!

     	   	      	 	    	      	 - Ted
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